TWI775068B - Power supply device - Google Patents

Abstract

A power supply device includes a filter circuit, a bridge rectifier, a first capacitor, a transformer, an output stage circuit, a power switch element, a feedback compensation circuit, a controller, and a supply circuit. The filter circuit and the bridge rectifier generate a rectified voltage according to a first input voltage and a second input voltage. The transformer includes a main coil, a secondary coil, and an auxiliary coil. The main coil receives the rectified voltage, and the secondary coil generates an induced voltage. The output stage circuit generates an output voltage according to the induced voltage. The power switch element selectively couples the main coil to a ground voltage according to a clock voltage. The feedback compensation circuit includes a linear optical coupler and a voltage regulator. The controller generates the clock voltage whose switching frequency is higher than 400kHz.

Description

Power Supplier

The present invention relates to a power supply, in particular to a power supply with a reduced overall volume.

The power supply of a traditional notebook computer is an external component, which usually occupies a considerable space. However, as the current mobile communication device becomes thinner and lighter, the external power supply with a large volume can no longer meet the needs of consumers. In view of this, it is necessary to propose a new solution to overcome the difficulties faced by the previous technology.

In a preferred embodiment, the present invention provides a power supply, comprising: a filter circuit that generates a first filter potential and a second filter potential according to a first input potential and a second input potential; a bridge rectifier , according to the first filtering potential and the second filtering potential to generate a rectified potential; a first capacitor to store the rectified potential; a transformer, including a main coil, a secondary coil, and an auxiliary coil, wherein the main coil is used to receive the rectified potential, and the secondary coil is used to generate an inductive response potential; an output stage circuit generating an output potential according to the induced potential; a power switch selectively coupling the main coil to a ground potential according to a clock potential; a feedback compensation circuit according to the outputting a potential to generate a feedback potential, wherein the feedback compensation circuit includes a linear optocoupler and a voltage regulator; a controller generates the clock potential according to the feedback potential, wherein the switching of the clock potential The frequency is higher than 400kHz; and a supply circuit is coupled to the auxiliary coil and outputs a supply potential to the controller.

In another preferred embodiment, the present invention provides a notebook computer, comprising: an upper cover element, including an upper cover shell and a display frame; a base element, including a keyboard frame and a base shell; a rotating shaft element, connecting between the upper cover element and the base element; and a mainboard, disposed between the keyboard frame and the base shell, wherein the mainboard includes: a connector; a power supply, including a power switch, wherein The power switch receives a clock level, and the switching frequency of the clock level is higher than 400 kHz; and a battery, wherein the connector is coupled to the battery through the power supply.

In order to make the objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are given in the following, and are described in detail as follows in conjunction with the accompanying drawings.

Certain terms are used throughout the specification and claims to refer to particular elements. It should be understood by those skilled in the art that hardware manufacturers may refer to the same element by different nouns. This specification and the scope of the patent application do not use the difference in name as a way to distinguish elements, but use the difference in function of the elements as a criterion for distinguishing. The words "including" and "including" mentioned in the entire specification and the scope of the patent application are open-ended terms, so they should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. Furthermore, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connecting means. Second device.

FIG. 1 is a schematic diagram of a power supply 100 according to an embodiment of the present invention. For example, the power supply 100 can be applied to a desktop computer, a notebook computer, or an all-in-one computer. As shown in FIG. 1, the power supply 100 includes: a filter circuit 110, a bridge rectifier 120, a first capacitor C1, a transformer 130, an output stage circuit 140, a power switch 150, and a feedback compensation circuit 160 , a controller 170 , and a supply circuit 180 . It should be noted that, although not shown in FIG. 1, the power supply 100 may further include other components, such as a voltage regulator or/and a negative feedback circuit.

The filter circuit 110 can generate a first filter potential VF1 and a second filter potential VF2 according to a first input potential VIN1 and a second input potential VIN2. Both the first input potential VIN1 and the second input potential VIN2 can come from an external input power source, wherein an AC voltage with any frequency and any amplitude can be formed between the first input potential VIN1 and the second input potential VIN2. For example, the frequency of the AC voltage may be about 50 Hz or 60 Hz, and the rms value of the AC voltage may be about 110V or 220V, but it is not limited thereto. The filter circuit 110 can be used to remove noises from the first input potential VIN1 and the second input potential VIN2. The bridge rectifier 120 can generate a rectified potential VR according to the first filtering potential VF1 and the second filtering potential VF2. The first capacitor C1 can store the rectified potential VR. The transformer 130 includes a main coil 131 , an auxiliary coil 132 , and an auxiliary coil 133 , wherein the main coil 131 and the auxiliary coil 133 can be located on the same side of the transformer 130 , and the auxiliary coil 132 can be located on the opposite side of the transformer 130 . The primary coil 131 can receive the rectified potential VR, and in response to the rectified potential VR, the secondary coil 132 can generate an induced potential VS. The output stage circuit 140 can VS to generate an output potential VOUT. For example, the output potential VOUT can be approximately a DC potential, and its level can be approximately 19V or 20V, but it is not limited thereto. The power switch 150 can selectively couple the main coil 131 to a ground potential VSS (eg, 0V) according to a clock potential VA. For example, if the clock potential VA is at a high logic level, the power switch 150 couples the main coil 131 to the ground potential VSS (that is, the power switch 150 can approximate a short-circuit path); otherwise, if the time When the pulse potential VA is at a low logic level, the power switch 150 does not couple the main coil 131 to the ground potential VSS (ie, the power switch 150 can approximate an open path). The feedback compensation circuit 160 includes a linear optocoupler 162 and a voltage regulator 164 . The feedback compensation circuit 160 can generate a feedback potential VB according to the output potential VOUT. For example, the controller 170 may be a pulse width modulation integrated circuit. The controller 170 can generate the clock potential VA according to the feedback potential VB, wherein the switching frequency of the clock potential VA is higher than 400 kHz. The supply circuit 180 is coupled to the auxiliary coil 133 and can output a supply potential VP to the controller 170 . That is, the controller 170 is powered by the supply circuit 180 . Under this design, since the switching frequency of the clock potential VA is much higher than the conventional 65 kHz, it can provide better conversion efficiency, so the overall size of the power supply 100 can be further reduced. Generally speaking, the present invention is applicable to various embedded designs and applications.

The following embodiments will introduce the detailed structure and operation of the power supply 100 . It must be understood that these drawings and descriptions are only examples and are not intended to limit the scope of the present invention.

FIG. 2 is a schematic diagram of a power supply 200 according to an embodiment of the present invention. In the embodiment of FIG. 2, the power supply 200 has a first The input node NIN1, a second input node NIN2, and an output node NOUT include a filter circuit 210, a bridge rectifier 220, a first capacitor C1, a transformer 230, an output stage circuit 240, and a power switch 250 , a feedback compensation circuit 260 , a controller 270 , and a supply circuit 280 . The first input node NIN1 and the second input node NIN2 of the power supply 200 can respectively receive a first input potential VIN1 and a second input potential VIN2 from an external input power source, and the output node NOUT of the power supply 200 can output An output potential VOUT is sent to an electronic device, such as a notebook computer.

The filter circuit 210 includes a second capacitor C2, a third capacitor C3, and an inductor L1. The first terminal of the second capacitor C2 is coupled to the first input node NIN1, and the second terminal of the second capacitor C2 is coupled to the second input node NIN2. The first end of the inductor L1 is coupled to the first input node NIN1, and the second end of the inductor L1 is coupled to a first node N1 to output a first filtering potential VF1. The third capacitor C3 has a first terminal and a second terminal, wherein the first terminal of the third capacitor C3 is coupled to the first node N1, and the second terminal of the third capacitor C3 is coupled to a second node N2 outputs a second filtering potential VF2.

The bridge rectifier 220 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 is coupled to the first node N1 to receive the first filtering potential VF1, and the cathode of the first diode D1 is coupled to a third node N3 to output a rectified potential VR. The anode of the second diode D2 is coupled to the second node N2 to receive the second filter potential VF2, and the cathode of the second diode D2 is coupled to the third node N3. Anode of the third diode D3 is coupled to a ground potential VSS, and the cathode of the third diode D3 is coupled to the first node N1. The anode of the fourth diode D4 is coupled to the ground potential VSS, and the cathode of the fourth diode D4 is coupled to the second node N2.

The first end of the first capacitor C1 is coupled to the third node N3 to receive and store the rectified potential VR, and the second end of the first capacitor C1 is coupled to the ground potential VSS.

The transformer 230 includes a main coil 231 , an auxiliary coil 232 , and an auxiliary coil 233 , wherein the main coil 231 and the auxiliary coil 233 can be located on the same side of the transformer 230 , and the auxiliary coil 232 can be located on the opposite side of the transformer 230 . In some embodiments, the transformer 230 is a planar transformer, which can be implemented by a plurality of metal traces on a dielectric substrate. The first end of the main coil 231 is coupled to the third node N3 to receive the rectified potential VR, and the second end of the main coil 231 is coupled to a fourth node N4. The first end of the secondary coil 232 is coupled to a fifth node N5 to output an induced potential VS, and the second end of the secondary coil 232 is coupled to a common node NCM. The first end of the auxiliary coil 233 is coupled to a sixth node N6, and the second end of the auxiliary coil 233 is coupled to the ground potential VSS.

The output stage circuit 240 includes a fifth diode D5 and a fourth capacitor C4. The anode of the fifth diode D5 is coupled to the fifth node N5 to receive the induced potential VS, and the cathode of the fifth diode D5 is coupled to the output node NOUT. The first end of the fourth capacitor C4 is coupled to the output node NOUT, and the second end of the fourth capacitor C4 is coupled to the common node NCM.

The power switch 250 includes a GaN field effect transistor M1. The GaN field effect transistor M1 has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the GaN field effect transistor M1 receives a clock potential VA from the controller 270, and the nitride The first terminal of the GaN field effect transistor M1 is coupled to the ground potential VSS, and the second terminal of the GaN field effect transistor M1 is coupled to the fourth node N4. It must be understood that the GaN FET M1 can withstand higher switching frequencies than the conventional MOSFET.

The feedback compensation circuit 260 includes a linear optocoupler 262, a voltage regulator 264, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first resistor R1, and a second resistor R2 , and a third resistor R3. In some embodiments, linear optocoupler 262 is implemented by a PC817 electronics. The linear optical coupler 262 includes a light emitting diode DL and a bipolar junction transistor Q1. The light-emitting diode DL has an anode and a cathode, wherein the anode of the light-emitting diode DL is coupled to the output node NOUT to receive the output potential VOUT, and the cathode of the light-emitting diode DL is coupled to a seventh node N7 . The bipolar junction transistor Q1 has a collector and an emitter, wherein the collector of the bipolar junction transistor Q1 is coupled to an eighth node N8 to output a feedback potential VB to the controller 270 . The emitter of the bipolar junction transistor Q1 is coupled to the ground potential VSS. The first end of the fifth capacitor C5 is coupled to the eighth node N8, and the second end of the fifth capacitor C5 is coupled to the ground potential VSS. The first end of the sixth capacitor C6 is coupled to the seventh node N7, and the second end of the sixth capacitor C6 is coupled to a ninth node N9. The first end of the first resistor R1 is coupled to the seventh node N7, and the second end of the first resistor R1 is coupled to a tenth node N10. Seventh electricity The first terminal of the capacitor C7 is coupled to the tenth node N10, and the second terminal of the seventh capacitor C7 is coupled to the ninth node N9. The first end of the second resistor R2 is coupled to the output node NOUT, and the second end of the second resistor R2 is coupled to the ninth node N9. The first end of the third resistor R3 is coupled to the ninth node N9, and the second end of the third resistor R3 is coupled to the common node NCM. In some embodiments, the voltage regulator 264 is implemented by a TL431 electronics. The anode of the regulator 264 is coupled to the common node NCM, the cathode of the regulator 264 is coupled to the seventh node N7, and the reference terminal of the regulator 264 is coupled to the ninth node N9.

The controller 270 may be a pulse width modulation integrated circuit. The controller 270 can generate the clock potential VA according to the feedback potential VB to adjust the duty cycle of the power switch 250 . Specifically, the switching frequency of the clock potential VA may be higher than 400 kHz, for example, 500 kHz, but it is not limited thereto.

The supply circuit 280 includes a sixth diode D6 and an eighth capacitor C8. The anode of the sixth diode D6 is coupled to the sixth node N6 , and the cathode of the sixth diode D6 is coupled to an eleventh node N11 to output a supply potential VP to the controller 270 . The first end of the eighth capacitor C8 is coupled to the eleventh node N11, and the second end of the eighth capacitor C8 is coupled to the ground potential VSS.

In some embodiments, the component parameters of the power supply 200 may be as follows. The capacitance value of the first capacitor C1 may be between 31.35 μF and 34.65 μF, preferably 33 μF. The capacitance value of the first capacitor C2 may be between 47.5nF and 52.5nF, preferably 50nF. The capacitance value of the third capacitor C3 may be between 47.5nF and 52.5nF, preferably 50nF. The capacitance value of the fourth capacitor C4 can be between Between 44.65μF and 49.35μF, preferably 47μF. The capacitance value of the fifth capacitor C5 can be between 0.99nF and 1.01nF, preferably 1nF. The capacitance value of the sixth capacitor C6 may be between 1.49nF and 1.51nF, preferably 1.5nF. The capacitance value of the seventh capacitor C7 may be between 46.53nF and 47.47nF, preferably 47nF. The capacitance value of the eighth capacitor C8 may be between 0.95 μF and 1.05 μF, preferably 1 μF. The inductance value of the inductor L1 can be between 0.36mH and 0.44mH, preferably 0.4mH. The resistance value of the first resistor R1 may be between 44.65KΩ and 49.35KΩ, preferably 47KΩ. The resistance value of the second resistor R2 can be between 66.31KΩ and 73.29KΩ, preferably 69.8KΩ. The resistance value of the third resistor R3 may be between 9.69KΩ and 10.71KΩ, preferably 10.2KΩ. The turns ratio of the primary coil 231 to the secondary coil 232 can be between 1 and 100, preferably 20. The turns ratio of the main coil 231 to the auxiliary coil 233 can be between 1 and 20, preferably 8. The conversion efficiency of the power supply 200 may be greater than or equal to 94%. The overall volume of the power supply 200 is about 40 cubic centimeters (the overall volume of a conventional external power supply is about 150 cubic centimeters). The above parameter ranges are obtained according to multiple experimental results, which help to minimize the overall volume of the power supply 200 .

FIG. 3 is a schematic diagram showing a conventional notebook computer 300 . In conventional designs, the notebook computer 300 includes a motherboard 320 , wherein a socket 370 is coupled to the motherboard 320 via a power supply 340 . Since the power supply 340 is an external component of the notebook computer 300 , it will occupy extra space and be inconvenient for the user to carry.

FIG. 4 is a schematic diagram of a notebook computer 400 according to an embodiment of the present invention. In the embodiment of FIG. 4 , the notebook computer 400 includes a motherboard 420 , wherein a socket 470 is coupled to the motherboard 420 and its power supply 200 . The detailed structure of the power supply 200 can be as described in the embodiment of FIG. 2 . It must be noted that because the clock potential VA with a higher switching frequency (higher than 400kHz) is used, the overall volume of the power supply 200 can be reduced by about 72%, so the power supply 200 can be completely embedded in the notebook. in the motherboard 420 of the computer 400 . The notebook computer 400 with this integrated design will no longer need any external power supply, which can save the manufacturing cost of many components, such as: output cables, charger connectors, and output current detectors and so on.

FIG. 5 is a schematic diagram of a notebook computer 500 according to an embodiment of the present invention. In the embodiment shown in FIG. 5 , the notebook computer 500 includes a cover element 501 , a base element 502 , a hinge element 503 , and a motherboard 520 , wherein the hinge element 503 is connected between the cover element 501 and the base element 502 between. In detail, the top cover element 501 includes a top cover casing 511 and a display frame 512 , and the base member 502 includes a keyboard frame 513 and a base casing 514 . It must be understood that the upper cover shell 511, the display frame 512, the keyboard frame 513, and the base shell 514 are respectively equivalent to the commonly known "A part", "B part", "C part", and "D part" in the field of notebook computers. item". The motherboard 520 is disposed between the keyboard frame 513 and the base shell 514 .

FIG. 6 is a schematic diagram of a motherboard 520 according to an embodiment of the present invention. In the embodiment of FIG. 6, the motherboard 520 includes a connector 530, a The power supply 540 and a battery 550 , wherein the connector 530 is coupled to the battery 550 through the power supply 540 . The connector 530 can be further coupled to an external AC power source (not shown) for performing a charging operation for the battery 550 . The power supply 540 at least includes a power switch 545 . The power switch 545 can receive a clock potential VA, and the switching frequency of the clock potential VA is higher than 400 kHz. That is, the power supply 540 can be embedded in the motherboard 520 instead of being an external component as conventionally, which can improve the portability of the notebook computer 500 . In addition, the power supply 540 may further include any other components as described in the embodiments of FIGS. 1 and 2 .

The present invention provides a novel power supply, the power switch of which is driven by a clock potential with a relatively high switching frequency. According to the actual measurement results, using the power supply of the above design can greatly reduce its overall volume, so it is very suitable for use in various embedded designs.

It should be noted that the potential, current, resistance value, inductance value, capacitance value and other component parameters mentioned above are not limitations of the present invention. Designers can adjust these settings according to different needs. The power supply and notebook computer of the present invention are not limited to the states shown in FIGS. 1-6. The present invention may include only any one or more of the features of any one or more of the embodiments of Figures 1-6. In other words, not all the features shown in the figures need to be implemented in both the power supply and the notebook computer of the present invention.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art will not depart from the spirit of the present invention and Within the scope of the present invention, some changes and modifications can be made, so the protection scope of the present invention should be determined by the scope of the appended patent application.

100,200,340,540: Power Supply

110, 210: Filter circuit

120,220: Bridge Rectifier

130,230: Transformer

131,231: Main coil

132,232: Secondary coil

133,233: Auxiliary coil

140, 240: Output stage circuit

150,250,545: Power switch

160,260: Feedback compensation circuit

162, 262: Linear optocouplers

164,264: Regulator

170,270: Controller

180,280: Supply circuit

300,400,500: Laptop

320,420,520: Motherboard

370,470: Socket

501: Upper cover element

502: Base element

503: Rotary shaft components

511: upper cover shell

512: Display border

513: Keyboard Border

514: Base shell

530: Connector

550: battery

C1: first capacitor

C2: Second capacitor

C3: Third capacitor

C4: Fourth capacitor

C5: Fifth capacitor

C6: Sixth capacitor

C7: Seventh capacitor

C8: Eighth capacitor

D1: first diode

D2: Second diode

D3: Third diode

D4: Fourth diode

D5: Fifth diode

D6: sixth diode

DL: Light Emitting Diode

L1: Inductor

M1: GaN Field Effect Transistor

N1: the first node

N2: second node

N3: The third node

N4: Fourth Node

N5: Fifth node

N6: sixth node

N7: seventh node

N8: Eighth Node

N9: ninth node

N10: The tenth node

N11: Eleventh node

NCM: Common Node

NIN: input node

NOUT: output node

Q1: Two-carrier junction transistor

R1: first resistor

R2: Second resistor

R3: Third resistor

VA: clock potential

VB: Feedback potential

VF1: The first filter potential

VF2: The second filter potential

VIN1: the first input potential

VIN2: The second input potential

VOUT: output potential

VP: Supply Potential

VR: rectified potential

VS: induced potential

VSS: ground potential

FIG. 1 is a schematic diagram of a power supply according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a power supply according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a conventional notebook computer.

FIG. 4 is a schematic diagram of a notebook computer according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a notebook computer according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a motherboard according to an embodiment of the present invention.

100: Power supply

110: Filter circuit

120: Bridge Rectifier

130: Transformer

131: main coil

132: Secondary coil

133: Auxiliary coil

140: Output stage circuit

150: Power switch

160: Feedback compensation circuit

162: Linear optocoupler

164: Regulator

170: Controller

180: Supply circuit

C1: first capacitor

VA: clock potential

VB: Feedback potential

VF1: The first filter potential

VF2: The second filter potential

VIN1: the first input potential

VIN2: The second input potential

VOUT: output potential

VP: Supply Potential

VR: rectifier potential

VS: induced potential

VSS: ground potential

Claims (9)

A power supply, comprising: a filter circuit, generating a first filter potential and a second filter potential according to a first input potential and a second input potential; a bridge rectifier, according to the first filter potential and the first filter potential Two filter potentials to generate a rectified potential; a first capacitor to store the rectified potential; a transformer including a main coil, a secondary coil, and an auxiliary coil, wherein the main coil is used for receiving the rectified potential, and the The secondary coil is used to generate an induced potential; an output stage circuit generates an output potential according to the induced potential; a power switch selectively couples the main coil to a ground potential according to a clock potential; a A feedback compensation circuit generates a feedback potential according to the output potential, wherein the feedback compensation circuit includes a linear optocoupler and a voltage regulator; a controller generates the clock potential according to the feedback potential, The switching frequency of the clock potential is higher than 400 kHz; and a supply circuit is coupled to the auxiliary coil and outputs a supply potential to the controller. The power supply of claim 1, wherein the filter circuit comprises: a second capacitor having a first end and a second end, wherein the second capacitor the first terminal of the second capacitor is coupled to a first input node to receive the first input potential, and the second terminal of the second capacitor is coupled to a second input node to receive the second input potential; a an inductor having a first end and a second end, wherein the first end of the inductor is coupled to the first input node, and the second end of the inductor is coupled to a first node to output the first filtering potential; and a third capacitor having a first end and a second end, wherein the first end of the third capacitor is coupled to the first node, and the third capacitor is The second terminal is coupled to a second node to output the second filter potential. The power supply of claim 2, wherein the bridge rectifier comprises: a first diode having an anode and a cathode, wherein the anode of the first diode is coupled to the first node to receive the first filter potential, and the cathode of the first diode is coupled to a third node to output the rectified potential; a second diode has an anode and a cathode, wherein the second diode The anode of the diode is coupled to the second node to receive the second filter potential, and the cathode of the second diode is coupled to the third node; a third diode has a an anode and a cathode, wherein the anode of the third diode is coupled to the ground potential, and the cathode of the third diode is coupled to the first node; and a fourth diode, has 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 first Two nodes; wherein the first capacitor has a first terminal and a second terminal, the first terminal of the first capacitor is coupled to the third node to receive the rectified potential, and the first terminal of the first capacitor Both terminals are coupled to the ground potential. The power supply of claim 3, wherein the transformer is a planar transformer, the main coil has a first end and a second end, and the first end of the main coil is coupled to the third node To receive the rectified potential, the second end of the primary coil is coupled to a fourth node, the secondary coil has a first end and a second end, and the first end of the secondary coil is coupled to a The fifth node outputs the induced potential, the second end of the auxiliary coil is coupled to a common node, the auxiliary coil has a first end and a second end, and the first end of the auxiliary coil is coupled to to a sixth node, and the second end of the auxiliary coil is coupled to the ground potential. The power supply of claim 4, wherein the output stage circuit comprises: a fifth diode having an anode and a cathode, wherein the anode of the fifth diode is coupled to the fifth node to receive the induced potential, and the cathode of the fifth diode is coupled to an output node to output the output potential; and a fourth capacitor has a first end and a second end, wherein the fourth The first end of the capacitor is coupled to the output node, and the second end of the fourth capacitor is coupled to the common node. The power supply of claim 5, wherein the power switch comprises: A GaN field effect transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the GaN field effect transistor receives the clock potential from the controller, The first terminal of the GaN field effect transistor is coupled to the ground potential, and the second terminal of the GaN field effect transistor is coupled to the fourth node. The power supply of claim 6, wherein the linear optical coupler comprises a light emitting diode having an anode and a cathode, the light emitting diode having an anode and a cathode, and the light emitting diode the anode is coupled to the output node to receive the output potential, the cathode of the light emitting diode is coupled to a seventh node, the bipolar junction transistor has a collector and an emitter, The collector of the bi-junction transistor is coupled to an eighth node to output the feedback potential to the controller, and the emitter of the bi-junction transistor is coupled to the ground potential. The power supply of claim 7, wherein the feedback compensation circuit further comprises: a fifth capacitor having a first end and a second end, wherein the first end of the fifth capacitor is coupled to the eighth node, and the second end of the fifth capacitor is coupled to the ground potential; a sixth capacitor has a first end and a second end, wherein the first end of the sixth capacitor is is coupled to the seventh node, and the second end of the sixth capacitor is coupled to a ninth node; a first resistor has a first end and a second end, wherein the first resistor the first terminal of the first resistor is coupled to the seventh node, and the second terminal of the first resistor is coupled to a tenth node; a seventh capacitor having a first terminal and a second terminal, wherein the first terminal of the seventh capacitor is coupled to the tenth node, and the second terminal of the seventh capacitor is coupled to the a ninth node; a second resistor having a first end and a second end, wherein the first end of the second resistor is coupled to the output node, and the second end of the second resistor The terminal is coupled to the ninth node; and a third resistor has a first terminal and a second terminal, wherein the first terminal of the third resistor is coupled to the ninth node, and the The second end of the third resistor is coupled to the common node; wherein the voltage stabilizer has an anode, a cathode, and a reference terminal, the anode of the voltage stabilizer is coupled to the common node, the voltage stabilizer The cathode of the voltage regulator is coupled to the seventh node, and the reference terminal of the voltage regulator is coupled to the ninth node. The power supply of claim 8, wherein the supply circuit comprises: a sixth diode having an anode and a cathode, wherein the anode of the sixth diode is coupled to the sixth node, And the cathode of the sixth diode is coupled to an eleventh node to output the supply potential to the controller; and an eighth capacitor having a first terminal and a second terminal, wherein the eighth capacitor The first terminal of the capacitor is coupled to the eleventh node, and the second terminal of the eighth capacitor is coupled to the ground potential.

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