Power supply device for noise suppression

Abstract

A noise-suppressing power supply includes: a bridge rectifier, an adjustable filter, a first inductor, a power switch, a first output stage circuit, a switching circuit, a transformer, a resonant capacitor, a second output stage circuit, a third output stage circuit, and a microcontroller. The adjustable filter is coupled to the bridge rectifier, and includes a plurality of filter circuits. The second output stage circuit generates an output potential. The third output stage circuit generates an auxiliary potential. The microcontroller generates a first control potential and a second control potential based on an AC potential. The adjustable filter can also selectively enable one or more of the aforementioned filter circuits based on the output potential, the first control potential, the second control potential, and the auxiliary potential.

Claims

1. A noise-suppressing power supply, comprising: A bridge rectifier generates a rectified potential based on a first input potential and a second input potential; an adjustable filter coupled to the bridge rectifier, wherein the adjustable filter includes a plurality of filter circuits; a first inductor receiving the rectified potential; a power switch selectively coupling the first inductor to a ground potential based on a first drive potential; a first output stage circuit coupled to the first inductor and generating an intermediate potential; a switching circuit generating a switching potential based on the intermediate potential, a second drive potential, and a third drive potential; a transformer including a main coil, a first secondary coil, a second secondary coil, and an auxiliary coil, wherein the transformer incorporates a leakage inductor and a magnetizing inductor, and the main coil receives the switching potential via the leakage inductor; a resonant capacitor coupled to the magnetizing inductor; and a second output stage circuit coupled to the first secondary coil and the second secondary coil and generating an output potential. A third output stage circuit is coupled to the auxiliary coil and generates an auxiliary potential; And a microcontroller that generates the first drive potential, the second drive potential, and the third drive potential, wherein the microcontroller further generates a first control potential and a second control potential based on an communication potential; wherein the adjustable filter selectively enables one or more of the filter circuits based on the output potential, the first control potential, the second control potential, and the auxiliary potential.

2. The power supply as claimed in claim 1, wherein the bridge rectifier comprises: A first diode having an anode and a cathode, wherein the anode system of the first diode is coupled to a first input node to receive the first input potential, and the cathode system of the first diode is coupled to a first node to output the rectified potential; a second diode having an anode and a cathode, wherein the anode system of the second diode is coupled to a second input node to receive the second input potential, and the cathode system of the second diode is coupled to the first node; a third diode having an anode and a cathode, wherein the anode system of the third diode is coupled to the ground potential, and the cathode system of the third diode is coupled to the first input node; And a fourth diode having an anode and a cathode, wherein the anode of the fourth diode is coupled to the ground potential, and the cathode of the fourth diode is coupled to the second input node; wherein the first inductor has a first terminal and a second terminal, the first terminal of the first inductor is coupled to the first node to receive the rectified potential, and the second terminal of the first inductor is coupled to a second node.

3. The power supply as claimed in claim 1, wherein the filtering circuitry of the adjustable filter comprises: A first resistor having a first terminal and a second terminal, wherein the first terminal of the first resistor is coupled to the ground potential, and the second terminal of the first resistor is coupled to a third node; a first capacitor having a first terminal and a second terminal, wherein the first terminal of the first capacitor is coupled to the ground potential, and the second terminal of the first capacitor is coupled to the third node; a second resistor having a first terminal and a second terminal, wherein the first terminal of the second resistor is coupled to a fourth node, and the second terminal of the second resistor is coupled to a fifth node; a second capacitor having a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to the fourth node, and the second terminal of the second capacitor is coupled to the fifth node; a third resistor having a first terminal and a second terminal, wherein the first terminal of the third resistor is coupled to the fourth node, and the second terminal of the third resistor is coupled to a sixth node; And a second inductor having a first terminal and a second terminal, wherein the first terminal of the second inductor is coupled to the fourth node, and the second terminal of the second inductor is coupled to the sixth node.

4. The power supply as described in claim 3, wherein the adjustable filter further comprises: A first transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the first transistor is used to receive the output potential, the first terminal of the first transistor is coupled to a ground potential, and the second terminal of the first transistor is coupled to the third node; A second transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the second transistor is used to receive the first control potential, the first terminal of the second transistor is coupled to the ground potential, and the second terminal of the second transistor is coupled to the fifth node; A third transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the third transistor is used to receive the second control potential, the first terminal of the third transistor is coupled to the ground potential, and the second terminal of the third transistor is coupled to the sixth node; and a fourth transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the fourth transistor is used to receive the auxiliary potential, the first terminal of the fourth transistor is coupled to the fourth node, and the second terminal of the fourth transistor is coupled to the ground potential.

5. The power supply as described in claim 2, wherein the power switch comprises: A fifth transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the fifth transistor is used to receive the first drive potential, the first terminal of the fifth transistor is coupled to the ground potential, and the second terminal of the fifth transistor is coupled to the second node.

6. The power supply as claimed in claim 2, wherein the first output stage circuitry includes: A fifth diode having an anode and a cathode, wherein the anode of the fifth diode is coupled to the second node and the cathode of the fifth diode is coupled to a seventh node to output the intermediate potential; and a third capacitor having a first terminal and a second terminal, wherein the first terminal of the third capacitor is coupled to the seventh node and the second terminal of the third capacitor is coupled to the ground potential.

7. The power supply as described in claim 6, wherein the switching circuit includes: A sixth transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the sixth transistor is used to receive the second driving potential, the first terminal of the sixth transistor is coupled to an eighth node to output the switching potential, and the second terminal of the sixth transistor is coupled to a seventh node to receive the intermediate potential; and a seventh transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the seventh transistor is used to receive the third driving potential, the first terminal of the seventh transistor is coupled to the ground potential, and the second terminal of the seventh transistor is coupled to the eighth node.

8. The power supply as claimed in claim 7, wherein the leakage inductor has a first terminal and a second terminal, the first terminal of the leakage inductor being coupled to the eighth node to receive the switching potential, the second terminal of the leakage inductor being coupled to a ninth node, the main coil having a first terminal and a second terminal, the first terminal of the main coil being coupled to the ninth node, the second terminal of the main coil being coupled to a tenth node, the magnetizing inductor having a first terminal and a second terminal, the first terminal of the magnetizing inductor being coupled to the ninth node, the second terminal of the magnetizing inductor being coupled to the tenth node, the resonant capacitor having a first terminal and a second terminal ... The first end of the container is coupled to the tenth node, the second end of the resonant capacitor is coupled to the ground potential, the first secondary coil has a first end and a second end, the first end of the first secondary coil is coupled to an eleventh node, the second end of the first secondary coil is coupled to a common node, the second secondary coil has a first end and a second end, the first end of the second secondary coil is coupled to the common node, the second end of the second secondary coil is coupled to a twelfth node, the auxiliary coil has a first end and a second end, the first end of the auxiliary coil is coupled to a thirteenth node, and the second end of the auxiliary coil is coupled to a ground potential.

9. The power supply as claimed in claim 8, wherein the second output stage circuitry includes: A sixth diode having an anode and a cathode, wherein the anode of the sixth diode is coupled to the eleventh node, and the cathode of the sixth diode is coupled to an output node to output the output potential; a seventh diode having an anode and a cathode, wherein the anode of the seventh diode is coupled to the twelfth node, and the cathode of the seventh diode is coupled to the output node; and a fourth capacitor having a first terminal and a second terminal, wherein the first terminal of the fourth capacitor is coupled to the output node, and the second terminal of the fourth capacitor is coupled to the common node.

10. The power supply as claimed in claim 8, wherein the third output stage circuitry includes: An eighth diode having an anode and a cathode, wherein the anode of the eighth diode is coupled to the thirteenth node and the cathode of the eighth diode is coupled to a fourteenth node to output the auxiliary potential; and a fifth capacitor having a first terminal and a second terminal, wherein the first terminal of the fifth capacitor is coupled to the fourteenth node and the second terminal of the fifth capacitor is coupled to the ground potential.

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