CLIAMS:We claim:
1. A rectifier for an alternator including a rotor and a stator with plurality of windings in the stator, the rectifier comprising:
a rectifier bridge comprising a plurality of metal oxide semiconductor field effect transistor (MOSFET) switches, the plurality of MOSFET switches comprising at least three pairs of connected upper MOSFET switches and lower MOSFET switches, wherein each of the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches and said lower MOSFET switches;
at least one driver circuit, to provide a predefined voltage to the plurality of MOSFET switches, to controlling an output current generated by each of the plurality of MOSFET switches; and
at least one control unit, connected to the at least one driver circuit, said at least one control unit control the at least one driver circuit based on the output current of the plurality of MOSFET switches.

2. The rectifier as claimed in claim 1, wherein number of windings in the stator is one of three windings and six windings.

3. The rectifier as claimed in claim 1, wherein the control unit controls each of the plurality of MOSFET switches by controlling the at least one driver circuit.

4. The rectifier as claimed in claim 1, wherein each of the plurality of MOSFET switch is one of N-channel MOSFET and P-channel MOSFET.

5. The rectifier as claimed in claim 1, wherein the driver circuit is a gate driver circuit.

6. The rectifier as claimed in claim 1, wherein the driver circuit is connected to a gate terminal of each of the plurality of MOSFET switches.

7. The rectifier as claimed in claim 1, wherein pairs of MOSFET switches of the plurality of MOSFET switches are configured in a bridge configuration to energize at least one of the plurality of phase windings of the stator.

8. The rectifier as claimed in claim 1, wherein the control unit controls firing angle of each of the plurality of MOSFET switches to control the output voltage of the alternator.

9. The rectifier as claimed in claim 1, wherein the alternator having MOSFET based Rectifier Bridge is a regulator less alternator.

10. A method of operating a metal oxide semiconductor field effect transistor (MOSFET) switches based rectifier of an alternator, having a rotor and a stator with plurality of windings in the stator, the method comprising:
receiving, by the MOSFET switches based rectifier, an alternate current (AC) from the stator windings of the alternator;
converting, by the MOSFET switches based rectifier, the AC into direct current (DC) comprising:
driving, by a driver circuit, each of the plurality of MOSFET switches based on a predefined control value;
determining, by a control unit, an output voltage generated by the alternator; and
controlling, by the control unit, the driver circuit to provide a predefined gate voltage to each of the plurality of MOSFET switches based on the output voltage.

11. The method as claimed in claim 10, wherein the output voltage of the rectifier is controlled by the control unit by controlling a firing angle of each of the plurality of MOSFET switches.

12. The method as claimed in claim 10, wherein the alternator having MOSFET based Rectifier Bridge is a regulator less alternator.

13. The method as claimed in claim 10, wherein number of windings in the stator is one of three windings and six windings.

14. The method as claimed in claim 10, wherein the driver circuit is a gate driver circuit, connected to a gate terminal of each of the plurality of MOSFET switches.
,TagSPECI:TECHNICAL FIELD
The present disclosure generally relate to an alternator. Particularly but not exclusively present disclosure relates to regulator less alternator in a vehicle.

BACKGROUND OF THE DISCLOSURE
Electric machines, such as, poly-phase claw pole alternators have been readily used in automobile applications. These alternators produce poly-phase AC currents and rectifiers are employed to convert the AC currents into DC currents to charge vehicle batteries and supply electrical power to electric vehicle devices.

In almost all vehicle alternators, P/N junction diodes are used as rectifying elements to convert AC currents into DC currents. The forward voltage drop of these power electronic P/N diodes is around 0.7 volt. About 8-10% of the total energy provided to an alternator will dissipate as heat in the rectifier. This heat dissipation reduces the alternator efficiency and increases temperature of rectifier and regulator.

Generally, an automotive alternator is connected with engine crank shaft by using belt drive mechanism. When engine starts rotating the torque from engine crank shaft will get transferred to alternator rotor pulley and alternator rotor will rotates. Figure 1 illustrates an electrical circuit diagram of a conventional alternator, in accordance with a prior art embodiment. The alternator comprises rotor, stator, rectifier and a regulator. The rotor is an electro magnet coil that generates the flux when current passes through it. The amount of flux generated by rotor coil is proportional to amount of current flowing through it. The stator is 3 phase (or 6 phase) winding (star or delta connection). When these windings cuts the flux generated by rotor coils and electromotive force (EMF) will generates in the stator windings.

The rectifier converts the power generated at stator terminal from alternating current (AC) to direct current (DC). The three phase bridge rectifier is as shown in Figure 2, which include plurality of diodes. The regulator, as shown in figure 3, is used to control the output voltage at the stator terminal within a specified limit of (14V +0.5V), wherein 0.5V is for temperature compensation. The output voltage at the stator terminal is given by,
VA=KNØ
Where,
VA = Voltage output at stator terminal.
K=Constant
N=Alternator rotor speed
Ø = Flux generated by rotor coil.

The alternator rotor speed is uncontrollable parameter therefore to control the output voltage at the stator output terminal flux generated by the rotor coil has to be controlled. The conventional has the drawbacks because of the diode forward voltage drop. Every diode consumes 0.7 V as the voltage drop across it during forward bias condition. Hence, there is loss of power consumption which is based on the number of diodes used in the alternator circuit. This loss will reduce the overall efficiency of the alternator.

In view of the above, it is apparent that there exists a need for an alternator to reduce the power consumption, improve the efficiency of the alternator circuit.

SUMMARY OF THE DISCLOSURE
The one or more shortcomings of the prior art are overcome by a mechanism as claimed and additional advantages are provided through the provision of mechanism as claimed in the present disclosure.

Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

Embodiments of the present disclosure provide a rectifier for an alternator including a rotor and a stator with plurality of windings in the stator. The alternator comprising a rectifier bridge comprising a plurality of metal oxide semiconductor field effect transistor (MOSFET) switches, at least one driver circuit and at least one control unit. The plurality of MOSFET switches comprising at least three pairs of connected upper MOSFET switches and lower MOSFET switches, wherein each of the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches and said lower MOSFET switches. The at least one driver circuit provides a predefined voltage to the plurality of MOSFET switches, for controlling an output current generated by each of the plurality of MOSFET switches. The at least one control unit is connected to the at least one driver circuit, said at least one control unit control the at least one driver circuit based on the output current of the plurality of MOSFET switches. The control unit controls a firing angle of each of the MOSFET switches through a driver circuit, to control the output voltage of the alternator. Thereby, making the alternator having MOSFET based Rectifier Bridge a regulator less alternator.

Embodiments of the present disclosure provide a method of operating a metal oxide semiconductor field effect transistor (MOSFET) switches based rectifier of an alternator having a rotor and a stator with plurality of windings in the stator. The method comprising receiving an alternate current (AC) from the stator windings of the alternator, by the MOSFET switches based rectifier and converting the AC into direct current (DC), which comprises driving each of the plurality of MOSFET switches by a driver circuit, based on a predefined control value. Also, the method comprises determining an output voltage generated by the alternator and controlling the driver circuit to provide a predefined gate voltage to each of the plurality of MOSFET switches based on the output voltage. The method comprises a control unit controlling a firing angle of each of the MOSFET switches through a driver circuit, for controlling the output voltage of the alternator. Thereby, making the alternator having MOSFET based Rectifier Bridge a regulator less alternator.

It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

OBJECTIVE OF THE DISCLOSURE
One object of the present disclosure is to provide an efficient alternator by reducing power consumption, and supply power in a vehicle.

One object of the present disclosure is to provide a regulator less alternator with metal oxide semiconductor field effect transistor (MOSFET) rectifier.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

Figure 1 illustrates a conventional alternator in a vehicle according to prior art embodiment;

Figure 2 illustrates a diode bridge rectifier configured in the conventional alternator of figure 1;

Figure 3 illustrates a regulator configured in the conventional alternator of figure 1;

Figure 4 illustrates an alternator circuit of in a vehicle according to an exemplary embodiment of the present disclosure; and

Figure 5 illustrates plots showing waveforms generated by the plurality of MOSFET switches in the bridge rectifier according to an embodiment of the present disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other mechanism for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

To overcome one or more drawbacks mentioned in the background, the present disclosure

The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that an assembly, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.

In the following description the words such as open, close, upward, downward with respect to particular orientation of the mechanism as illustrated in drawings of the present disclosure. The words are used to explain the aspects of the present disclosure and for better understanding. However, one should not construe such terms as limitation to the present disclosure, since the terms may interchange based on the orientation of the mechanism.

Embodiments of the present disclosure provide an alternator including a rotor and a stator with plurality of windings in the stator. The alternator comprising a rectifier bridge comprising a plurality of metal oxide semiconductor field effect transistor (MOSFET) switches, at least one driver circuit and at least one control unit. The plurality of MOSFET switches comprising at least three pairs of connected upper MOSFET switches and lower MOSFET switches, wherein each of the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches and said lower MOSFET switches. The at least one driver circuit provides a predefined voltage to the plurality of MOSFET switches, to controlling an output current generated by each of the plurality of MOSFET switches. The at least one control unit is connected to the at least one driver circuit, said at least one control unit control the at least one driver circuit based on the output current of the plurality of MOSFET switches. The control unit controls a firing angle of each of the MOSFET switches through a driver circuit, to control the output voltage of the alternator. Thereby, making the alternator having MOSFET based Rectifier Bridge a regulator less alternator.

Embodiments of the present disclosure provide a method of operating an alternator having a rotor and a stator with plurality of windings in the stator. The method comprising driving each of the plurality of MOSFET switches by a driver circuit, based on a predefined control value. Also, the method comprises determining an output voltage generated by the alternator and controlling the driver circuit to provide a predefined gate voltage to each of the plurality of MOSFET switches based on the output voltage.

Embodiments of the present disclosure relate to improving efficiency of an alternator compared to the conventional alternator diode rectifier bridge. To achieve this, the alternator diode rectifier bridge is replaced with a MOSFET based rectifier bridge, which needs a separate controller for driving the MOSFETs, whereas the conventional alternator requires a field regulator. Thus, integrate the field regulator with the MOSFET bridge controller to achieve the voltage regulation, by controlling a firing angle of the MOSFETs and eliminate the existing field regulator completely.

Figure 4 illustrates an alternator circuit 400 of in a vehicle according to an exemplary embodiment of the present disclosure. As shown in figure 4, the alternator circuit 400 also referred as MOSFET based alternator or alternator, comprises a rotor 402, a stator 401 with plurality of windings, at least one metal oxide semiconductor field effect transistor (MOSFET) based Rectifier Bridge 403 having plurality of MOSFET switches 404, at least one driver circuit 405 and at least one control unit (not shown in the figure). The rotor or field 402 is an electro magnet coil that generates the flux when current passes through it. The amount of flux generated by rotor coil is proportional to amount of current flowing through it. In one embodiment, the stator 401 has 3 phase winding. In an alternative embodiment, the stator has 6 phase winding. The stator is configured in one of star and delta connection.

The plurality of MOSFET switches 404 comprising at least three pairs of connected upper MOSFET switches 404 and lower MOSFET switches 404, wherein each of the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches 404 and the lower MOSFET switches 404. The at least one driver circuit 405 provides a predefined voltage to the plurality of MOSFET switches 404, to controlling an output current generated by each of the plurality of MOSFET switches 404. The at least one control unit also referred as a controller or control unit or a microcontroller. In one embodiment, the control unit is an engine control unit of the vehicle. The control unit is connected to the at least one driver circuit 405 also referred as a gate driver or gate driver circuit, for controlling the same, based on the output current of the plurality of MOSFET switches 404.

The MOSFET based bridge rectifier 403 converts the power generated at stator terminal from alternating current (AC) to direct current (DC). The output voltage of the MOSFET bridge rectifier 403 is controlled by the gate driver 405. The gate driver circuit 405 provides the required or predefined gate voltage to each of the plurality of MOSFETs 404. The gate driver 405 controls the firing angle of the MOSFET switches to control the output voltage of the alternator, thereby achieving a constant field current for the alternator. In one embodiment the control unit is one of an engine control unit. In another embodiment, the control unit is a microcontroller. The output 406 of the bridge rectifier is a rectified and regulated output voltage. This output voltage 406 is use to power one or more electronic components or devices in the vehicle.

Therefore, after replacing diodes in Rectifier Bridge with MOSFETs losses in the bridge will reduces by factor of five. As shown figure 4, it is possible to control the output current of the MOSFET by controlling the VGS (Gate to Source) voltage. In one embodiment, the replacement of diode in Rectifier Bridge will serve for two purposes, converting power generated at stator terminal from AC to DC, and regulating the output voltage across the stator terminal. By using the MOSFETs in Rectifier Bridge the voltage regulation of alternator output voltage is achieved, hence it is possible to eliminate the regulator assembly in the alternator. Thus, the alternator is also referred as regulator less alternator.

Figure 5 shows various plots illustrating waveforms generated by the plurality of MOSFET switches in the bridge rectifier according to an embodiment of the present disclosure. As shown figure 5, top most waveform shows the 3 phase AC input to the rectifier assembly, below which is second waveform which is the output of 6 MOSFETS (namely, T1, T2, T3, T4, T5 and T6), sequence of operation of each MOSFET. The third waveform below the second shows the output voltage and output current profile for a particular firing angle. Also, the third shows that output voltage can be controlled by controlling the firing and of the MOSFETs. By controlling of the firing of MOSFETs, the output voltage of the rectifier bridge is controlled, thereby, eliminating the need of regulator assembly. The fourth waveform (below the third waveform) shows the output voltage across the MOSFET switch T1 and fifth or the bottom most waveform of the figure 5 shows the current profile for phase A.

One embodiment of the present disclosure provides a method of operating a metal oxide semiconductor field effect transistor (MOSFET) switches based rectifier of an alternator having a rotor and a stator with plurality of windings in the stator. The method comprising receiving an alternate current (AC) from the stator windings of the alternator, by the MOSFET switches based rectifier and converting the AC into direct current (DC). The converting of AC to DC comprises driving each of the plurality of MOSFET switches, by a driver circuit, based on a predefined control value. Also, the method comprises a control unit performing, determining of an output voltage generated by the alternator and controlling the driver circuit to provide a predefined gate voltage to each of the plurality of MOSFET switches based on the output voltage. The driver circuit is a gate driver circuit, connected to a gate terminal of each of the plurality of MOSFET switches. The output voltage of the alternator is controlled by the control unit by controlling a firing angle of each of the plurality of MOSFET switches through the driver circuit. In one embodiment, the number of windings in the stator is one of three windings and six windings.

It is to be understood by a person of ordinary skill in the art that various modifications and variations may be made without departing from the scope and spirit of the present invention. Therefore, it is intended that the present invention covers such modifications and variations provided they come within the ambit of the appended claims and their equivalents.

Advantage:
The present disclosure provides an alternator with improved efficiency compared to the conventional alternator diode rectifier bridge.

The diode based rectifier bridge having a voltage regulator is replaces with MOSFET based Rectifier Bridge which needs a separate controller for driving the MOSFETs.

The present disclosure provides a 20% reduction in power consumption as compared to forward voltage drop of diode. Therefore by replacing diodes with MOSFET will lead to improvement in rectification efficiency (also overall efficiency) by approximately 5%. Thus, using MOSFETs, the alternator eliminates the drawbacks because of the diode forward voltage drop in the alternator diode rectifier bridge circuit. Every diode consumes 0.7 V as the voltage drop across it during forward bias condition. Hence, there is loss of power consumption which is based on the number of diodes used in the conventional alternator circuit. This loss will reduce the overall efficiency of the alternator using MOSFET in place of diodes.

Embodiments of the present disclosure provides an alternator having a MOSFET based rectifier bridge and a MOSFET bridge controller for achieving voltage regulation by with the control of firing angle of the MOSFETs and thus eliminate the existing field regulator completely.

Industrial applicability:
The alternator of the present disclosure may be used in any vehicles for supply power to the electronic devices or components placed inside the vehicle.

Equivalents:

With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Referral Numerals:

Reference Number Description
400 MOSFET based alternator
401 Stator
402 Rotor Field
403 MOSFET Bridge Rectifier
404 MOSFET switches
405 Gate driver circuit
406 Output Voltage
 
We claim:
1. A rectifier for an alternator including a rotor and a stator with plurality of windings in the stator, the rectifier comprising:
a rectifier bridge comprising a plurality of metal oxide semiconductor field effect transistor (MOSFET) switches, the plurality of MOSFET switches comprising at least three pairs of connected upper MOSFET switches and lower MOSFET switches, wherein each of the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches and said lower MOSFET switches;
at least one driver circuit, to provide a predefined voltage to the plurality of MOSFET switches, to controlling an output current generated by each of the plurality of MOSFET switches; and
at least one control unit, connected to the at least one driver circuit, said at least one control unit control the at least one driver circuit based on the output current of the plurality of MOSFET switches.

2. The rectifier as claimed in claim 1, wherein number of windings in the stator is one of three windings and six windings.

3. The rectifier as claimed in claim 1, wherein the control unit controls each of the plurality of MOSFET switches by controlling the at least one driver circuit.

4. The rectifier as claimed in claim 1, wherein each of the plurality of MOSFET switch is one of N-channel MOSFET and P-channel MOSFET.

5. The rectifier as claimed in claim 1, wherein the driver circuit is a gate driver circuit.

6. The rectifier as claimed in claim 1, wherein the driver circuit is connected to a gate terminal of each of the plurality of MOSFET switches.

7. The rectifier as claimed in claim 1, wherein pairs of MOSFET switches of the plurality of MOSFET switches are configured in a bridge configuration to energize at least one of the plurality of phase windings of the stator.

8. The rectifier as claimed in claim 1, wherein the control unit controls firing angle of each of the plurality of MOSFET switches to control the output voltage of the alternator.

9. The rectifier as claimed in claim 1, wherein the alternator having MOSFET based Rectifier Bridge is a regulator less alternator.

10. A method of operating a metal oxide semiconductor field effect transistor (MOSFET) switches based rectifier of an alternator, having a rotor and a stator with plurality of windings in the stator, the method comprising:
receiving, by the MOSFET switches based rectifier, an alternate current (AC) from the stator windings of the alternator;
converting, by the MOSFET switches based rectifier, the AC into direct current (DC) comprising:
driving, by a driver circuit, each of the plurality of MOSFET switches based on a predefined control value;
determining, by a control unit, an output voltage generated by the alternator; and
controlling, by the control unit, the driver circuit to provide a predefined gate voltage to each of the plurality of MOSFET switches based on the output voltage.

11. The method as claimed in claim 10, wherein the output voltage of the rectifier is controlled by the control unit by controlling a firing angle of each of the plurality of MOSFET switches.

12. The method as claimed in claim 10, wherein the alternator having MOSFET based Rectifier Bridge is a regulator less alternator.

13. The method as claimed in claim 10, wherein number of windings in the stator is one of three windings and six windings.

14. The method as claimed in claim 10, wherein the driver circuit is a gate driver circuit, connected to a gate terminal of each of the plurality of MOSFET switches.

Dated this 31st Day of March, 2015

Sravan Kumar Gampa
Of K&S Partners
Agent for the Applicant

“MOSFET BRIDGE RECTIFIER BASED ALTERNATOR IN A VEHICLE AND A METHOD THEREOF”

ABSTRACT
Embodiments of the present disclosure provide a rectifier for an alternator comprising a rotor and a stator. The alternator comprises a metal oxide semiconductor field effect transistor (MOSFET) Rectifier Bridge. The rectifier comprises a plurality of MOSFET switches, a driver circuit and a control unit. The MOSFET switches are arranged in three pairs of connected upper MOSFET switches and lower MOSFET switches and the three stator winding outputs are electrically connected to the rectifier bridge between a respective pair of the upper MOSFET switches and lower MOSFET switches. The driver circuit provides a predefined voltage to the MOSFET switches, to control output current generated by each of the MOSFET switches. The control unit controls a firing angle of each of the MOSFET switches through a driver circuit, to control the output voltage of the alternator. Thereby, making the alternator having MOSFET based Rectifier Bridge a regulator less alternator.

FIG. 1