TW202141232A - Power supply device and notebook computer - 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 supply and laptop

The present invention relates to a power supply, and particularly relates to a power supply that can be reduced in overall volume.

The power supply of a traditional notebook computer is an external component, which often occupies a considerable amount of space. However, as current mobile communication devices are becoming thinner and lighter, external power supplies with larger volumes cannot 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 including: 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; and a bridge rectifier , According to the first filter potential and the second filter 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 auxiliary coil is used to generate an induced potential; an output stage circuit generates an output potential based on the induced potential; a power switch selectively uses a clock potential The main coil is coupled to a ground potential; 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 stabilizer; a controller, according to the The feedback potential is used to generate the clock potential, wherein the switching frequency of the clock potential 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, including: 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 hinge element connected to Between the upper cover element and the base element; and a motherboard, arranged between the keyboard frame and the base shell, wherein the motherboard includes: a connector; a power supply including a power switch, wherein The power switch receives a clock potential, and the switching frequency of the clock potential is higher than 400kHz; and a battery, wherein the connector is coupled to the battery through the power supply.

In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are specifically listed below, in conjunction with the accompanying drawings, and are described in detail as follows.

Certain vocabulary is used to refer to specific elements in the specification and the scope of the patent application. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and the scope of the patent application do not use differences in names as a way to distinguish elements, but use differences in functions of elements as a criterion for distinguishing. The terms "include" and "include" mentioned in the entire specification and the scope of the patent application are open-ended terms and should be interpreted as "including but not limited to". The term "approximately" 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. In addition, the term "coupling" includes any direct and indirect electrical connection means in this specification. Therefore, if it is described in the text that a first device is 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 connection means. Two devices.

FIG. 1 shows a schematic diagram of a power supply 100 according to an embodiment of the invention. For example, the power supply 100 can be applied to a desktop computer, a notebook computer, or an integrated computer. As shown in Figure 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 Figure 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 having 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 can be about 50Hz or 60Hz, and the root mean square value of the AC voltage can be about 110V or 220V, but it is not limited to this. The filter circuit 110 can be used to remove noise in 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 winding 131, a secondary winding 132, and an auxiliary winding 133. The primary winding 131 and the auxiliary winding 133 can be located on the same side of the transformer 130, and the secondary winding 132 can be located on the opposite side of the transformer 130. . The main coil 131 can receive the rectified potential VR, and in response to the rectified potential VR, the auxiliary coil 132 can generate an induced potential VS. The output stage circuit 140 can generate an output potential VOUT according to the induced potential VS. For example, the output potential VOUT can be roughly a DC potential, and its level can be about 19V or 20V, but it is not limited to this. The power switch 150 can selectively couple the main coil 131 to a ground potential VSS (for example, 0V) according to a clock potential VA. For example, if the clock potential VA is at a high logic level, the power switch 150 will couple the main coil 131 to the ground potential VSS (that is, the power switch 150 can be approximated as a short-circuit path); If the pulse potential VA is a low logic level, the power switch 150 will not couple the main coil 131 to the ground potential VSS (that is, the power switch 150 can be approximated as an open path). The feedback compensation circuit 160 includes a linear optical coupler 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 supplied with power by the supply circuit 180. Under this design, since the switching frequency of the clock potential VA is much higher than the traditional about 65kHz, it can provide better conversion efficiency, so the overall size of the power supply 100 can be further reduced. Generally speaking, the present invention can be applied 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 used to limit the scope of the present invention.

FIG. 2 is a schematic diagram of the power supply 200 according to an embodiment of the invention. In the embodiment of Figure 2, the power supply 200 has a first input node NIN1, a second input node NIN2, and an output node NOUT, and includes a filter circuit 210, a bridge rectifier 220, and a first capacitor C1, a transformer 230, an output stage circuit 240, 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 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 end of the second capacitor C2 is coupled to the first input node NIN1, and the second end 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 filter 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 filter 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. The 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 terminal of the first capacitor C1 is coupled to the third node N3 to receive and store the rectified potential VR, and the second terminal of the first capacitor C1 is coupled to the ground potential VSS.

The transformer 230 includes a main winding 231, a secondary winding 232, and an auxiliary winding 233. The primary winding 231 and the auxiliary winding 233 can be located on the same side of the transformer 230, and the secondary winding 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 auxiliary coil 232 is coupled to a fifth node N5 to output an induced potential VS, and the second end of the auxiliary 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 gallium nitride field effect transistor M1. The gallium nitride field effect transistor M1 has a control terminal, a first terminal, and a second terminal. The control terminal of the gallium nitride field effect transistor M1 receives a clock potential VA from the controller 280. The first end of the gallium field effect transistor M1 is coupled to the ground potential VSS, and the second end of the gallium nitride field effect transistor M1 is coupled to the fourth node N4. It must be understood that the GaN field effect transistor M1 can withstand a higher switching frequency than the traditional metal oxide half field effect transistor.

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, a second resistor R2 , And a third resistor R3. In some embodiments, the linear optical coupler 262 is implemented by a PC817 electronic component. The linear optical coupler 262 includes a light emitting diode DL and a dual carrier junction transistor Q1. The light emitting diode DL has an anode and a cathode. 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 two-carrier junction transistor Q1 has a collector and an emitter, wherein the collector of the two-carrier 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 terminal of the fifth capacitor C5 is coupled to the eighth node N8, and the second terminal of the fifth capacitor C5 is coupled to the ground potential VSS. The first end of the sixth capacitor C6 is coupled to a 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 a seventh node N7, and the second end of the first resistor R1 is coupled to a tenth node N10. The first end of the seventh capacitor C7 is coupled to the tenth node N10, and the second end 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 electronic component. 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. In detail, the switching frequency of the clock potential VA can be higher than 400kHz, such as 500kHz, but it is not limited to this.

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 terminal of the eighth capacitor C8 is coupled to the eleventh node N11, and the second terminal 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 described below. 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 can be between 47.5 nF and 52.5 nF, preferably 50 nF. The capacitance value of the third capacitor C3 may be between 47.5 nF and 52.5 nF, preferably 50 nF. The capacitance value of the fourth capacitor C4 may be between 44.65 μF and 49.35 μF, preferably 47 μF. The capacitance value of the fifth capacitor C5 may be between 0.99 nF and 1.01 nF, and preferably may be 1 nF. The capacitance value of the sixth capacitor C6 can be between 1.49 nF and 1.51 nF, preferably 1.5 nF. The capacitance value of the seventh capacitor C7 can be between 46.53 nF and 47.47 nF, preferably 47 nF. The capacitance value of the eighth capacitor C8 may be between 0.95 μF and 1.05 μF, and preferably may be 1 μF. The inductance value of the inductor L1 may be between 0.36 mH and 0.44 mH, preferably 0.4 mH. 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 may 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 ratio of the number of turns of the primary coil 231 to the secondary coil 232 can be between 1 and 100, and preferably can be 20. The ratio of the number of turns of the main coil 231 to the auxiliary coil 233 can be between 1 and 20, and preferably can be 8. The conversion efficiency of the power supply 200 can 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 traditional external power supply is about 150 cubic centimeters). The above parameter range is obtained based on the results of many experiments, which helps to minimize the overall volume of the power supply 200.

FIG. 3 is a schematic diagram showing a conventional notebook computer 300. In the traditional design, the notebook computer 300 includes a motherboard 320, and 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 additional space and cause inconvenience 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, and 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 in FIG. 2. It must be noted that because the clock potential VA with a higher switching frequency (above 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 main board 420 of the model computer 400. The notebook computer 400 adopting 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.

FIG. 5 is a schematic diagram of a notebook computer 500 according to an embodiment of the present invention. In the embodiment of Figure 5, the notebook computer 500 includes a cover element 501, a base element 502, a shaft element 503, and a motherboard 520, wherein the shaft element 503 is connected to the cover element 501 and the base element 502 between. In detail, the upper cover element 501 includes an upper cover shell 511 and a display frame 512, and the base element 502 includes a keyboard frame 513 and a base shell 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 "A part", "B part", "C part" and "D part" commonly known in the field of notebook computers. Pieces". The main board 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 invention. In the embodiment of FIG. 6, the motherboard 520 includes a connector 530, a power supply 540, and a battery 550, wherein the connector 530 is coupled to the battery 550 via the power supply 540. The connector 530 can be coupled to an external AC power source (not shown) to perform a charging operation on the battery 550. The power supply 540 includes at least 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 400kHz. That is, the power supply 540 can be embedded in the motherboard 520 instead of being an external component as traditionally, 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 proposes a novel power supply whose power switch is driven by a clock potential with a higher switching frequency. According to actual measurement results, using the power supply of the aforementioned design can greatly reduce its overall size, so it is very suitable for various embedded designs.

It is worth noting that the above-mentioned potential, current, resistance value, inductance value, capacitance value, and other component parameters are not limitations of the present invention. The designer can adjust these settings according to different needs. The power supply and notebook computer of the present invention are not limited to the state shown in Figs. 1-6. The present invention may only include any one or more of the features of any one or more of the embodiments shown in FIGS. 1-6. In other words, not all the illustrated features need to be implemented in the power supply and the notebook computer of the present invention at the same time.

Although the present invention is disclosed as above in a preferred embodiment, it is not intended to limit the scope of the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention shall be subject to those defined by the attached patent scope.

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 optocoupler 164,264: voltage 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: shaft element 511: Upper cover shell 512: display frame 513: keyboard frame 514: Base shell 530: Connector 550: battery C1: The first capacitor C2: second capacitor C3: third capacitor C4: The fourth capacitor C5: Fifth capacitor C6: sixth capacitor C7: seventh capacitor C8: Eighth capacitor D1: The first diode D2: The second diode D3: The third diode D4: The fourth diode D5: Fifth diode D6: The sixth diode DL: Light-emitting diode L1: Inductor M1: Gallium Nitride Field Effect Transistor N1: the first node N2: second node N3: third node N4: Fourth node N5: fifth node N6: sixth node N7: seventh node N8: The eighth node N9: Ninth node N10: Tenth node N11: The 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: second filter potential VIN1: first input potential VIN2: second input potential VOUT: output potential VP: supply potential VR: Rectified potential VS: induced potential VSS: Ground potential

Figure 1 is a schematic diagram of a power supply according to an embodiment of the invention. FIG. 2 is a schematic diagram of the power supply according to an embodiment of the invention. Figure 3 shows a schematic diagram of a traditional notebook computer. FIG. 4 is a schematic diagram showing a notebook computer according to an embodiment of the invention. FIG. 5 is a schematic diagram of a notebook computer according to an embodiment of the invention. Fig. 6 is a schematic diagram of a motherboard according to an embodiment of the 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: Voltage Regulator

170: Controller

180: supply circuit

C1: The first capacitor

VA: clock potential

VB: feedback potential

VF1: the first filter potential

VF2: second filter potential

VIN1: first input potential

VIN2: second input potential

VOUT: output potential

VP: supply potential

VR: Rectified potential

VS: induced potential

VSS: Ground potential

Claims (10)

A power supply including: 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 that generates a rectified potential according to the first filtering potential and the second filtering potential; A first capacitor storing 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 induced potential; An output stage circuit generates an output potential according to the induced potential; A power switch, which selectively couples the main coil to a ground potential according to a clock potential; 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 that generates the clock potential according to the feedback potential, wherein the switching frequency of the clock potential is higher than 400kHz; and A supply circuit is coupled to the auxiliary coil and outputs a supply potential to the controller. The power supply according to claim 1, wherein the filter circuit includes: A second capacitor has a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to a first input node to receive the first input potential, and the second capacitor has a The second terminal is coupled to a second input node to receive the second input potential; An inductor has 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 has a first terminal and a second terminal, wherein the first terminal of the third capacitor is coupled to the first node, and the second terminal of the third capacitor is coupled to a The second node outputs the second filtering potential. The power supply according to claim 2, wherein the bridge rectifier includes: A first diode has 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 anode of the second 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 having 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 ;as well as 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 node ； 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 second terminal of the first capacitor is 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 main coil is coupled to a fourth node, the auxiliary coil has a first end and a second end, and the first end of the auxiliary 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 a sixth node, and the second end of the auxiliary coil is coupled to the ground potential. The power supply according to claim 4, wherein the output stage circuit includes: A fifth diode has 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 Connected to an output node to output the output potential; and A fourth capacitor has 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. The power supply according to claim 5, wherein the power switch includes: A gallium nitride field effect transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the gallium nitride field effect transistor receives the clock potential from the controller, The first end of the gallium nitride field effect transistor is coupled to the ground potential, and the second end of the gallium nitride field effect transistor is coupled to the fourth node. The power supply of claim 6, wherein the linear optical coupler includes a light-emitting diode and a bi-carrier junction transistor, the light-emitting diode has 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, and the bi-carrier junction transistor has a collector and an emitter, The collector of the bi-carrier junction transistor is coupled to an eighth node to output the feedback potential to the controller, and the emitter of the bi-carrier junction transistor is coupled to the ground Potential. The power supply according to claim 7, wherein the feedback compensation circuit further includes: A fifth capacitor has a first terminal and a second terminal, wherein the first terminal of the fifth capacitor is coupled to the eighth node, and the second terminal of the fifth capacitor is coupled to the Ground potential A sixth capacitor having a first terminal and a second terminal, wherein the first terminal of the sixth capacitor is coupled to the seventh node, and the second terminal of the sixth capacitor is coupled to a Ninth node A first resistor has a first end and a second end, wherein the first end of the first resistor is coupled to the seventh node, and the second end of the first resistor is coupled Connected to a tenth node; A seventh capacitor has 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 Ninth node A second resistor has 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 is coupled To the ninth node; and A third resistor has a first end and a second end, wherein the first end of the third resistor is coupled to the ninth node, and the second end of the third resistor is coupled Connected to the common node; 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 cathode of the voltage stabilizer is coupled to the seventh node, and the stabilizer The reference terminal of the compressor is coupled to the ninth node. The power supply according to claim 8, wherein the supply circuit includes: 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 a tenth A node to output the supply potential to the controller; and An eighth capacitor having a first terminal and a second terminal, wherein the first terminal of the eighth capacitor is coupled to the eleventh node, and the second terminal of the eighth capacitor is coupled to The ground potential. A notebook computer including: 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 connected between the upper cover element and the base element; and A main board is arranged between the keyboard frame and the base shell, wherein the main board includes: A connector A power supply including a power switch, wherein the power switch receives a clock potential, and the switching frequency of the clock potential is higher than 400kHz; and A battery, wherein the connector is coupled to the battery via the power supply.

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