The present disclosure relates to the field of power supply. More
particularly the present disclosure relates to a regulated input voltage using capacitor charge control.
5
BACKGROUND
[0002] Background description includes information that may be useful in
understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed
} invention, or that any publication specifically or implicitly referenced is prior art.
[0003] In embedded products there is a possibility of wide range of
voltage at the Input of the power supply unit. While designing power supply of the product these ranges to be handled. The output voltage of the power supply block should remain fixed whereas Input voltage will vary based on the number of
5 phases present or range of supply voltage available in the input side. In the power supply design Zener Diode is used as voltage regulator. In the product, load current remains fixed and the design should support this load current. The power supply design should be capable to drive the load with lower input voltage at the input terminal to the higher input voltage available at the input with the selected
} Zener device. For example, to support single phase 144V at the input side higher Zener value to be selected whereas for 3 phase 288V at the input, lower voltage Zener diode is enough to drive the load. With this type of products, the problem is power dissipation across Zener. Power dissipation is more if higher voltage is present at the input terminal. The Zener can heat up which will reduce the
5 reliability of the product. With the present solution we can manage the heating issue and increase the reliability.
[0004] There is, therefore, a need of an improved regulated power supply
that is free from above discussed problems.
i

OBJECTS OF THE PRESENT DISCLOSURE
[0005] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies are as listed herein below.
[0006] It is an object of the present disclosure to provide a regulated
5 power supply, which has reduced power dissipation.
[0007] It is an object of the present disclosure to provide a regulated
power supply, which has improved reliability.
[0008] It is an object of the present disclosure to provide a regulated
power supply, which has increased life.
D [0009] It is an object of the present disclosure to provide a regulated
power supply, which is cost effective.
[0010] It is an object of the present disclosure to provide a regulated
power supply, which is efficient.
5 SUMMARY
[0011] The present disclosure relates to the field of power supply. More
particularly the present disclosure relates to a regulated input voltage using
capacitor charge control.
[0012] An aspect of the present disclosure pertains to a regulated power
D supply that includes a rectifier electrically coupled to an input supply for
converting an AC voltage into a DC voltage. A voltage regulator electrically
coupled with the rectifier to regulate the DC voltage output of the rectifier. The
voltage regulator comprises a capacitor diode. A switch electrically configured
with the voltage regulator for controlling charging and discharging operation of 5 the capacitor. A DC-DC voltage converter electrically coupled, in parallel, with
the voltage regulator.
[0013] In an aspect, the power supply may comprise a control circuit
configured between the capacitor and the switch.
[0014] In an aspect, the switch may be configured to be electrically open
D or electrically closed, to control charging and discharging of the capacitor, based
on an output signal of the control circuit.

[0015] In an aspect, when the switch is electrically open the capacitor may
charge, and when the switch is electrically close, the capacitor may discharge
across the DC -DC converter.
[0016] In an aspect, the switch may comprise a MOSFET.
5 [0017] In an aspect, the rectifier may be electrically coupled with the input
supply through a series impedance capacitor.
[0018] In an aspect, the rectifier may be electrically coupled with the
voltage regulator through a diode.
[0019] Various objects, features, aspects and advantages of the inventive
D subject matter will become more apparent from the following detailed description
of preferred embodiments, along with the accompanying drawing figures in which
like numerals represent like components.
BRIEF DESCRIPTION OF DRAWINGS
5 [0020] The accompanying drawings are included to provide a further
understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which
D thus is not a limitation of the present disclosure.
[0021] In the figures, similar components and/or features may have the
same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is
5 used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
[0022] FIG. 1 illustrates exemplary representation of a regulated power
supply, in accordance with an embodiment of the present disclosure.

[0023] FIG. 2 illustrates exemplary representation of an output waveform
of the regulated power supply, in accordance with an embodiment of the present disclosure.
5 DETAILED DESCRIPTION
[0024] The following is a detailed description of embodiments of the
disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the
D contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[0025] In the following description, numerous specific details are set forth
in order to provide a thorough understanding of embodiments of the present
5 invention. It will be apparent to one skilled in the art that embodiments of the
present invention may be practiced without some of these specific details.
[0026] The present disclosure relates to the field of power supply. More
particularly the present disclosure relates to a regulated input voltage using capacitor charge control.
D [0027] The present disclosure elaborates upon a regulated power supply
that includes a rectifier electrically coupled to an input supply for converting an AC voltage into a DC voltage. A voltage regulator electrically coupled with the rectifier to regulate the DC voltage output of the rectifier. The voltage regulator comprises a capacitor diode. A switch electrically configured with the voltage
5 regulator for controlling charging and discharging operation of the capacitor. A DC-DC voltage converter electrically coupled, in parallel, with the voltage regulator.
[0028] In an embodiment, the power supply can comprise a control circuit
configured between the capacitor and the switch.

[0029] In an embodiment, the switch can be configured to be electrically
open or electrically closed, to control charging and discharging of the capacitor,
based on an output signal of the control circuit.
[0030] In an embodiment, when the switch is electrically closed the
capacitor can charge, and when the switch is electrically open, the capacitor can
discharge across the DC -DC converter.
[0031] In an embodiment, the switch can comprise a MOSFET.
[0032] In an embodiment, the rectifier can be electrically coupled with the
input supply through a series impedance capacitor.
[0033] In an embodiment, the rectifier can be electrically coupled with the
voltage regulator through a diode.
[0034] FIG. 1 illustrates exemplary representation of a regulated power
supply, in accordance with an embodiment of the present disclosure.
[0035] FIG. 2 illustrates exemplary representation of an output waveform
of the regulated power supply, in accordance with an embodiment of the present
disclosure.
[0036] As illustrated, a regulated power 100 can include a rectifier 104
electrically coupled to an input supply 102 for converting an AC voltage into a
DC voltage. The rectifier 104 can include any of full wave rectifier and a bridge
rectifier. A voltage regulator 106 can be electrically coupled with the rectifier 104
to regulate the DC voltage output of the rectifier 104. The voltage regulator 106
can include a capacitor or a tank capacitor. A switch 108 can be electrically
configured with the voltage regulator 106 for controlling charging and discharging
operation of the capacitor. The switch 108 can include but not limited to a
MOSFET. A DC-DC voltage converter 110 can be electrically coupled, in
parallel, with the voltage regulator 106.
[0037] In an embodiment, the regulated power supply 100 can include a
control circuit 112 that can be configured between the capacitor 106 and the
switch 108. The switch 108 can be configured to be electrically open or
electrically closed, to control charging and discharging of the capacitor 106, based
on an output signal of the control circuit 112. When the switch 108 is electrically

closed the capacitor can charge, and when the switch is electrically open, the capacitor can discharge across the DC -DC converter 110. The rectifier 104 can be electrically coupled with the input supply through a capacitor 114. The rectifier 104 can be electrically coupled with the voltage regulator 106 through a diode 116
5 for reverse voltage protection. The output waveform of the proposed regulator power supply is shown in FIG. 2 and can be further stabilized on later stage. The control circuit 112 can include an operational amplifier comparator with one input as reference voltage and other input the rectified voltage signal. Based on the output of comparator switch can be toggled ON/OFF
D [0038] The proposed regulated power supply eliminates heating effect across the Zener diode used in the conventional regulated power supplies. Also, the proposed design is cost effective since Zener diode is replaced with capacitor. Proposed design can provide a SMPS like heat free power supply at the cost of capacitor drop power supply. Irrespective of the input voltage range, heat
5 dissipation is nullified at the low cost of capacitor drop power supply. Unlike SMPS power supply, a ripple free source voltage can be achieved using this design.
[0039] Moreover, in interpreting the specification, all terms should be
interpreted in the broadest possible manner consistent with the context. In
D particular, the terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something
5 selected from the group consisting of A, B, C ....and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0040] While the foregoing describes various embodiments of the
invention, other and further embodiments of the invention may be devised without
D departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described

embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
5 ADVANTAGES OF THE INVENTION
[0041] The proposed invention provides a regulated power supply, which
has reduced power dissipation.
[0042] The proposed invention provides a regulated power supply, which
has improved reliability.
D [0043] The proposed invention provides a regulated power supply, which
has increased life.
[0044] The proposed invention provides a regulated power supply, which
is cost effective.
[0045] The proposed invention provides a regulated power supply, which
5 is efficient.

We Claim:

1. A regulated power supply comprising:
a rectifier electrically coupled to an input supply for converting an AC voltage into a DC voltage;
a voltage regulator electrically coupled with the rectifier to regulate the DC voltage output of the rectifier, wherein the voltage regulator comprises a capacitor diode;
a switch electrically configured with the voltage regulator for controlling charging and discharging operation of the capacitor; and
a DC-DC voltage converter electrically coupled, in parallel, with the voltage regulator.
2. The power supply as claimed in claim 1, wherein the power supply
comprises a control circuit configured between the capacitor and the
switch.
3. The power supply as claimed in claim 2, wherein the switch is configured
to be electrically open or electrically closed, to control charging and
discharging of the capacitor, based on an output signal of the control
circuit.
4. The power supply as claimed in claim 1, wherein when the switch is electrically open the capacitor charges, and when the switch is electrically close, the capacitor discharges across the DC -DC converter.
5. The power supply as claimed in claim 1, wherein the switch comprises a MOSFET.
6. The power supply as claimed in claim 1, wherein the rectifier is electrically coupled with the input supply through a capacitor.

7. The power supply as claimed in claim 1, wherein the rectifier is electrically coupled with the voltage regulator through a diode.