Claims: We claim:
1. A self-driven current regulator, comprising:
an input circuitry configured to receive an input voltage from a voltage source;
an output circuitry configured to supply an output voltage; and
a current limiter arrangement operably coupled between the input circuitry and the output circuitry.
2. The current regulator according to Claim 1, wherein the input circuitry comprises of an interference circuit and an input voltage sensing circuit.
3. The current regulator according to Claim 2, wherein the interference circuit is configured for reducing the electromagnetic interference.
4. The current regulator according to Claim 2, wherein the voltage sensing circuit comprises of:
a switching component; and
a plurality of passive components.
5. The current regulator according to Claim 4, wherein the switching component is selected from a group comprising of a Transistor, a MOSFET, a BJT, an IGBT, a SCR and/or combinations thereof.
6. The current regulator according to Claim 4, wherein the passive component is selected from a group comprising of a resistor, a capacitor, an inductor, a diode and/or combinations thereof.
7. The current regulator according to Claim 1, wherein the output circuitry comprises of a filter, wherein the filter is at least one selected from a group comprising of a capacitive filter, a RC filter, a LC filter, a RLC filter or a combination thereof.
8. The current regulator according to Claim 1, wherein the current limiter arrangement comprises of:
a pull down circuit; and
an inrush current limiter.
9. The current regulator according to Claim 8, wherein the pull down circuit comprises of:
a switching component; and
a plurality of passive components.
10. The current regulator according to Claim 9, wherein the switching component is selected from a group comprising of a Transistor, a MOSFET, a BJT, an IGBT, a SCR and/or combinations thereof.
11. The current regulator according to Claim 9, wherein the passive component is selected from a group comprising of a resistor, a capacitor, a diode, an inductor, and or a combination thereof.
12. The current regulator according to Claim 8, wherein the inrush current limiter comprises of
a RC time constant,
a switching component; and
a plurality of passive components.
13. The current regulator according to Claim 12, a RC time constant is configured for linear rising of voltage.
14. The current regulator according to Claim 12, the switching component is selected from a group comprising of a MOSFET, a BJT, an IGBT, a SCR and/or combinations thereof.
15. The current regulator according to Claim 12, wherein the passive component is selected from a group comprising of a resistor, a capacitor, an inductor, a diode and or a combination thereof.
16. The current regulator according to Claim 1, wherein the self-driven current regulator is independent of load.

Bangalore NARENDRA BHATTA HL
16 January 2017 (INTELLOCOPIA IP SERVICES)
AGENT FOR APPLICANT

, Description:
A SELF-DRIVEN CURRENT REGULATOR

FIELD OF INVENTION
The invention generally relates to the field of current limiters and particularly to a self-driven current regulator.

BACKGROUND
An inrush current limiter is a component used to limit inrush current to avoid gradual damage to components. The inrush current limiter reduces electromagnetic interference due to current and voltage spikes. There are systems known in the art that provides current limiters.
One of the systems provides a circuit and method for controlling when a load may be fully energized. The method includes directing electrical current through a current limiting resistor that has a first terminal connected to a source terminal of a field effect transistor FET, and a second terminal connected to a drain terminal of the FET. The gate voltage magnitude on a gate terminal of the FET is varied, whereby current flow through the FET is increased while current flow through the current limiting resistor is simultaneously decreased. A determination is made as to when the gate voltage magnitude on the gate terminal is equal to or exceeds a predetermined reference voltage magnitude, and the load is enabled to be fully energized when the gate voltage magnitude is equal to or exceeds the predetermined reference voltage magnitude. The disadvantage is that the output is dependent on the load.
Another system known in the art uses a NTC Thermistor. The NTC Thermistor requires high cool-down/recovery time. The system does not provide effective inrush current limiting at higher temperature.

BRIEF DESCRIPTION OF DRAWINGS
So that the manner in which the recited features of the invention can be understood in detail, some of the embodiments are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
FIG.1 shows a block diagram of a self-driven current regulator, according to an embodiment of the invention.
FIG.2 shows schematic representation of the self-driven current regulator, according to an embodiment of the invention.

SUMMARY OF THE INVENTION
One aspect of the invention provides aself-driven current regulator. The self-driven current regulator includes an input circuitry configured to receive an input voltage from a voltage source, an output circuitry configured to supply an output voltage and a current limiter arrangement operably coupled between the input circuitry and the output circuitry.
DETAILED DESCRIPTION OF THE INVENTION
Various embodiments of the invention provide a self-driven current regulator. The self-driven current regulator includes an input circuitry configured to receive an input voltage from a voltage source, an output circuitry configured to supply an output voltage and a current limiter arrangement operably coupled between the input circuitry and the output circuitry. The self-driven current regulator described herein briefly can be explained in detail.
FIG.1 shows a block diagram of a self-driven current regulator, according to an embodiment of the invention. The current regulator includes an input 101 configured to receive an input voltage from a voltage source. The input 101 includes an interference circuit. The interference circuit is enabled to reduce the electromagnetic interference. In one example of the invention, the interference circuit includes a plurality of capacitors connected across the input. The input 101 further includes an input voltage sensing circuit that is enabled to monitor the voltage within a desired level. The input voltage sensing circuit includes a switching component and a plurality of passive components. Examples of the switching component include but are not limited to a transistor, a MOSFET, a BJT, an IGBT, and/or combinations thereof. In one example of the invention, the switching component is a transistor. Examples of passive components include but are not limited to a resistor, a capacitor, an inductor, a diode and/or combinations thereof. In one example of the invention, the passive components are at least one combination of the resistor and the diode. The current regulator includes an output 105 configured to supply an output voltage. The output includes a filter circuit. Examples of filter circuit include but are not limited to a capacitive filter, a RC filter, a LC filter, a RLC filter or a combination thereof. In one example of the invention, the filter is capacitive filter. A current limiter arrangement 103 is operably connected in between the input 101 and the output 105. The current limiting arrangement 103 includes a pull down circuit. The pull down circuit includes a switching component. Examples of the switching component include but are not limited to a transistor, a MOSFET, a BJT, an IGBT, and/or combinations thereof. In one example of the invention, the switching component is transistor. The pull down circuit includes a plurality of passive components. Examples of passive components include but are not limited to a resistor, a capacitor, an inductor, a diode and/or combinations thereof. In one example of the invention, the passive components are at least one combination of the resistor and the diode. Further, the current limiting arrangement 103 includes an inrush current limiter. The inrush current limiter includes a RC Time constant. The RC time constant enables the linear rising of the voltage. The inrush current limiter further includes a switching component. Examples of the switching component include but are not limited to a transistor, a MOSFET, a BJT, an IGBT, SCR and/or combinations thereof. In one example of the invention, the switching component is a MOSFET. The inrush current limiter includes a plurality of passive components. Examples of passive components include but are not limited to a resistor, a capacitor, an inductor, a diode and/or combinations thereof. In one example of the invention, the passive components are at least one combination of the resistor and the diode. The current regulator is independent of load.
Working of the circuit:
The circuit operates in two modes:
Mode 1: As the power is turned on, there is an inrush current spike. The inrush current flows through the interference filter. The interference filter capacitors acts as a short during the initial turn on of the power. There is rise in dv/dt for a short duration. The voltage level is set by the transistor and the diode of the input voltage sensing circuit. When the voltage drop is more than the desired level across the resistor, the transistor of the pull down circuit gets triggered and turned on. The gate voltage of the MOSFET is pulled down and the inrush current is limited through series resistor. The MOSFET gets triggered by the pull down circuit pulse. The output is taken out from the output circuitry filter.
Mode 2:
The interference filter capacitor is charged slightly higher than the level set by the voltage sensing circuit. The gate voltage rises linearly through the RC constant. The MOSFET is switched ON in a linear mode to charge the capacitive filter at the output. The output is taken out from the output circuitry filter with inrush current suppression.
Thus, the invention provides a self-driven current regulator that is independent of load. The self-driven current regulator as described herein and as illustrated through the accompanying drawings can be used to reduce unwanted EMI noise due to current and voltage spikes. Further, the invention provides continuous plug-in inrush current limiting during the frequent ON/OFF of the input bus.
The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.