A power switching circuit

Abstract

The application provides a power switch circuit, comprising an optical coupling circuit and a reset circuit, wherein the optical coupling circuit comprises an optical coupling chip, which is used for outputting a first control signal to the reset circuit in response to a first external control signal; the reset circuit comprises a reset chip, which is used for outputting a power-on control signal or a power-off control signal to a controlled power chip in response to the first control signal. The power switch circuit provided by the application can control the power-on or power-off of the power chip through the external control signal in the case of continuous power supply of an external power supply, realizes the switching function of the power equipment, is beneficial to reducing the overall power consumption of the system, and has the advantages of stability and reliability.

Description

Technical Field

[0001] This invention relates to the field of circuit technology. More specifically, it relates to a power switching circuit. Background Technology

[0002] Based on usage requirements, there is a need for continuous external power supply to control the power-on or power-off of electrical equipment, in order to reduce the overall power consumption of the system. How to reliably and stably meet this requirement has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a power switch circuit to solve at least one of the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a power switch circuit, including an optocoupler circuit and a reset circuit. The optocoupler circuit includes an optocoupler chip, which is used to output a first control signal to the reset circuit in response to a first external control signal. The reset circuit includes a reset chip, which is used to output a power-on control signal or a power-off control signal to the controlled power chip in response to the first control signal.

[0005] Optionally, the first channel of the optocoupler chip includes a first control voltage receiving port, a first external control signal receiving port, and a first control signal output port. The optocoupler circuit includes a first primary-side driving sub-circuit, which includes a first resistor, a second resistor, a first diode, and a first capacitor. The first end of the first resistor is connected to the input terminal of the first control voltage. The second end of the first resistor, the first end of the first capacitor, the cathode of the first diode, the first end of the second resistor, and the first control voltage receiving port are coupled to a first node. The second end of the first capacitor, the anode of the first diode, the second end of the second resistor, and the first external control signal receiving port are coupled to a second node. The second node is connected to the input terminal of the first external control signal.

[0006] Optionally, the optocoupler circuit further includes a first secondary output sub-circuit, which includes a third resistor. The first end of the third resistor is connected to the input terminal of an external power supply, and the second end of the third resistor is connected to the first control signal output port.

[0007] Optionally, the optocoupler circuit further includes a secondary-side filter circuit, which includes a second capacitor and a third capacitor. The first terminal of the second capacitor and the first terminal of the third capacitor are respectively connected to the input terminal of an external power supply, and the second terminal of the second capacitor and the second terminal of the third capacitor are respectively grounded.

[0008] Optionally, the reset circuit includes a control signal conditioning sub-circuit, which includes a second diode, a fourth resistor, and a fourth capacitor. The anode of the second diode serves as the first control signal input terminal of the reset circuit, and the cathode of the second diode is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor, the first terminal of the fourth capacitor, and the reset control port of the reset chip are coupled to a third node, and the second terminal of the fourth capacitor is grounded.

[0009] Optionally, the reset circuit includes a reset output drive sub-circuit, which includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the input terminal of an external power supply. The second end of the fifth resistor, the reset output port of the reset chip, and the first end of the sixth resistor are coupled to a fourth node. The second end of the sixth resistor serves as the output terminal of the power-on control signal or power-off control signal of the reset circuit.

[0010] Optionally, the optocoupler chip is further configured to output a second control signal to the reset circuit in response to the second external control signal; the reset chip is further configured to output a power-on control signal or a power-off control signal to the controlled power supply chip in response to the second control signal.

[0011] Optionally, the second channel of the optocoupler chip includes a second control voltage receiving port, a second external control signal receiving port, and a second control signal output port. The optocoupler circuit further includes a second primary-side driving sub-circuit, which includes a seventh resistor, an eighth resistor, a third diode, and a fifth capacitor. The first end of the seventh resistor is connected to the input terminal of the second control voltage. The second end of the seventh resistor, the first end of the fifth capacitor, the cathode of the third diode, the first end of the eighth resistor, and the second control voltage receiving port are coupled to a fifth node. The second end of the fifth capacitor, the anode of the third diode, the second end of the eighth resistor, and the second external control signal receiving port are coupled to a sixth node. The sixth node is connected to the input terminal of the second external control signal.

[0012] Optionally, the optocoupler circuit further includes a second secondary output sub-circuit, which includes a ninth resistor. The first end of the ninth resistor is connected to the input terminal of an external power supply, and the second end of the ninth resistor is connected to the second control signal output port.

[0013] Optionally, the control signal conditioning sub-circuit further includes a fourth diode, the anode of which serves as the second control signal input terminal of the reset circuit, and the cathode of which is connected to the first terminal of the fourth resistor.

[0014] The beneficial effects of this invention are as follows: The power switch circuit provided by this invention can control the power chip to power on or off via an external control signal when the external power supply is continuous, thereby realizing the switching function of the electrical equipment and reducing the overall power consumption of the system. This power switch circuit also has advantages such as stability and reliability. Specifically, this power switch circuit adopts a two-stage architecture of optocoupler circuit and reset circuit. Compared with existing technologies that combine optocouplers with transistor / MOSFET switches or microcontroller chips (MCUs) with power management chips, it achieves a hardware-based power-off function without the need for a controller. Attached Figure Description

[0015] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0016] Figure 1 This diagram illustrates the optocoupler circuit in the power switch circuit provided in an embodiment of the present invention.

[0017] Figure 2 This diagram illustrates a reset circuit in a power switch circuit provided in an embodiment of the present invention. Detailed Implementation

[0018] To more clearly illustrate the present invention, the following description, in conjunction with embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0020] It should also be noted that in the description of this invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] This invention provides a power switch circuit, including an optocoupler circuit and a reset circuit. The optocoupler circuit includes an optocoupler chip, which is used to output a first control signal to the reset circuit in response to a first external control signal. The reset circuit includes a reset chip, which is used to output a power-on control signal or a power-off control signal to the controlled power chip in response to the first control signal.

[0022] The power switch circuit provided in this embodiment can control the power chip to power on or off via an external control signal when the external power supply is continuous, thereby realizing the switching function of the electrical equipment and reducing the overall power consumption of the system. This power switch circuit also has advantages such as stability and reliability. Specifically, the power switch circuit adopts a two-stage architecture of an optocoupler circuit and a reset circuit. The optocoupler circuit includes an optocoupler chip for receiving and isolating external control signals, while the reset circuit includes a reset chip for controlling the power chip of the electrical equipment to power on or off in response to the control signal from the optocoupler circuit when the external power supply is continuous. In a specific example, such as... Figure 1 As shown, the model of optocoupler chip B2 is, for example, GH0631G. Figure 2 As shown, the model of the reset chip U21 is, for example, HWD706T, and the external power supply voltage is, for example, 5V.

[0023] In one possible implementation, the first channel of the optocoupler chip includes a first control voltage receiving port, a first external control signal receiving port, and a first control signal output port. The optocoupler circuit includes a first primary-side driving sub-circuit, which includes a first resistor, a second resistor, a first diode, and a first capacitor. The first end of the first resistor is connected to the input terminal of the first control voltage. The second end of the first resistor, the first end of the first capacitor, the cathode of the first diode, the first end of the second resistor, and the first control voltage receiving port are coupled to a first node. The second end of the first capacitor, the anode of the first diode, the second end of the second resistor, and the first external control signal receiving port are coupled to a second node. The second node is connected to the input terminal of the first external control signal.

[0024] The first primary-side driver circuit can provide current limiting, reverse voltage protection and high-frequency filtering for the primary side of the first channel. The first diode can prevent signal backflow.

[0025] Continuing with the previous example, such as Figure 1 As shown, the first channel of optocoupler chip B2 includes a first control voltage receiving port 1, a first external control signal receiving port 2, and a first control signal output port 7. The first primary-side driving sub-circuit includes a first resistor R155, a second resistor R156, a first diode V9, and a first capacitor C279. The first end of the first resistor R155 is connected to the input terminal of the first control voltage, "Control 3.3V power supply" (the first control voltage is 3.3V). The second end of the first resistor R155, the first end of the first capacitor C279, the cathode of the first diode V9, the first end of the second resistor R156, and the first control voltage receiving port 1 are coupled to a first node. The second end of the first capacitor R155, the anode of the first diode V9, the second end of the second resistor R156, and the first external control signal receiving port 2 are coupled to a second node. The second node is connected to the input terminal of the first external control signal, "Control 1". The resistance of the first resistor R155 is, for example, 120Ω, the resistance of the second resistor R156 is, for example, 4.7kΩ, the first diode V9 is, for example, a 1N4148 type small high-speed switching diode, and the capacitance of the first capacitor C279 is, for example, 330pF.

[0026] Combination Figure 1 As shown in Table 1, the functions of the eight ports of the GH0631G dual-channel isolated optocoupler chip B2 are as follows.

[0027] Table 1

[0028] In the optocoupler chip B2, the two diodes on the primary side have their anodes connected to a 3.3V control voltage via a resistor, and their cathodes connected to an external control signal. If the external control signal is high, there is no voltage difference on the primary side, the optocoupler is cut off, and the secondary side outputs a high level (pull-up). If the external control signal is low, there is a 3.3V voltage difference on the primary side, the optocoupler is turned on, and the secondary side outputs a low level.

[0029] For example: When the first control signal input to the first external control signal input terminal "Control 1" is at a high level, the first channel of the optocoupler chip B2 is cut off, and the first control signal "Control 1_CRTL" output from the first control signal output port 7 is at a high level. Figure 2 The reset control port MR of the reset chip U21 shown is pulled high, the reset output port RESET of the reset chip U21 outputs a high level, the output terminal "RESET_power" of the reset circuit outputs a high-level power-on control signal, and the subsequent power supply chip is powered on. When the first control signal input to the first external control signal input terminal "Control 1" is low, the first channel of the optocoupler chip B2 is turned on, and the first control signal output from the first control signal output port 7 is low. Figure 2 The reset control port MR of the reset chip U21 shown is pulled down to ground, and the reset output port RESET of the reset chip U21 outputs a low level. The output terminal "RESET_Power" of the reset circuit outputs a low-level power-off control signal, and the subsequent power supply chip is powered off.

[0030] In one possible implementation, the optocoupler circuit further includes a first secondary output sub-circuit, which includes a third resistor. The first end of the third resistor is connected to the input terminal of an external power supply, and the second end of the third resistor is connected to the first control signal output port.

[0031] The first secondary output sub-circuit provides a pull-up for the open-collector first control signal "control 1_CRTL", converting the current signal into a 5V digital level. Continuing the previous example, as... Figure 1 As shown, the first secondary output sub-circuit includes a third resistor R157. The first end of the third resistor R157 is connected to the external power supply input terminal "+5V", and the second end of the third resistor R157 is connected to the first control signal output port 7, serving as the first control signal output terminal of the optocoupler circuit. The resistance value of the third resistor R157 is, for example, 510Ω.

[0032] In one possible implementation, the optocoupler circuit further includes a secondary-side filter circuit, which includes a second capacitor and a third capacitor. The first terminal of the second capacitor and the first terminal of the third capacitor are respectively connected to the access terminal of an external power supply, and the second terminal of the second capacitor and the second terminal of the third capacitor are respectively grounded.

[0033] The secondary-side filter circuit is used to perform high- and low-frequency decoupling filtering on the power supply of the optocoupler chip, such as 5V, to suppress power supply ripple. Continuing the previous example, as... Figure 1 As shown, the secondary-side filter circuit includes a second capacitor C289 and a third capacitor C99. The first terminals of the second capacitor C289 and the third capacitor C99 are respectively connected to the external power supply terminal "+5V", and the second terminals of the second capacitor C289 and the third capacitor C99 are respectively grounded. The capacitance of the second capacitor C289 is, for example, 0.1μF and the capacitance of the third capacitor C99 is, for example, 1μF.

[0034] In one possible implementation, the reset circuit includes a control signal conditioning sub-circuit, which includes a second diode, a fourth resistor, and a fourth capacitor. The anode of the second diode serves as the first control signal input terminal of the reset circuit, and the cathode of the second diode is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor, the first terminal of the fourth capacitor, and the reset control port of the reset chip are coupled to a third node, and the second terminal of the fourth capacitor is grounded.

[0035] In the control signal conditioning sub-circuit: the fourth resistor ensures that the reset control port of the reset chip is pulled low by default when there is no control signal, causing the reset output port of the reset chip to output a low level. The output of the reset circuit then outputs a low-level power-off control signal, de-energizing the subsequent power supply chip and triggering its shutdown. The fourth capacitor filters out high-frequency glitches to prevent accidental shutdown. The second diode prevents signal backflow.

[0036] Continuing with the previous example, such as Figure 2 As shown, the control signal conditioning sub-circuit includes a second diode V5, a fourth resistor R178, and a fourth capacitor C212. The anode of the second diode V5 serves as the first control signal input terminal of the reset circuit. The cathode of the second diode V5 is connected to the first terminal of the fourth resistor R178. The second terminal of the fourth resistor R178, the first terminal of the fourth capacitor C212, and the reset control port MR of the reset chip U21 are coupled to the third node. The second terminal of the fourth capacitor C212 is grounded. The second diode V5 is, for example, a 1N4148 type small high-speed switching diode. The resistance of the fourth resistor R178 is, for example, 10kΩ, and the capacitance of the fourth capacitor C212 is, for example, 0.1μF.

[0037] Combination Figure 2 As shown in Table 2, the functions of the eight ports of the HWD706T power monitoring and reset chip U21 are as follows.

[0038] Table 2

[0039] The reset control port MR of the reset chip U21 is active low, for example: when the voltage is less than 0.8V, the reset output port RESET outputs a low level; when the voltage is greater than 2.0V, it operates normally and the reset output port RESET outputs a high level. The output terminal "RESET_Power" of the reset circuit is connected to the enable terminal of the subsequent power supply chip. The power-on and power-off of the power supply chip are controlled by the high and low levels output by the reset output port RESET.

[0040] Figure 2 As shown, resistor R168 is a surface-mount resistor with a nominal value of 0Ω. If subsequent EMC testing reveals that high-frequency interference is causing false triggering, resistor R168 can be directly replaced with a resistor of, for example, 100Ω~10kΩ. This will effectively filter and suppress high-frequency glitches without modifying the board.

[0041] Figure 2 As shown, resistor R135 with a resistance of, for example, 1.5kΩ, resistor R136 with a resistance of, for example, 1kΩ, capacitor C88 with a capacitance of, for example, 1μF, and capacitor C89 with a capacitance of, for example, 0.1μF constitute an idle port anti-interference sub-circuit, which is used to provide pull-down clamping and filtering for the power supply voltage detection port PFI of reset chip U21 to avoid floating interference.

[0042] In one possible implementation, the reset circuit includes a reset output drive sub-circuit, which includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the input terminal of an external power supply, and the second end of the fifth resistor, the reset output port of the reset chip, and the first end of the sixth resistor are coupled to a fourth node. The second end of the sixth resistor serves as the output terminal of the power-on control signal or power-off control signal of the reset circuit.

[0043] In the reset output driver sub-circuit, the fifth resistor is used to provide a pull-up for the reset output port RESET, and the sixth resistor is used to limit the output current as needed to match the output impedance of the subsequent power supply chip.

[0044] Continuing with the previous example, such as Figure 2As shown, the reset output drive sub-circuit includes, for example, a fifth resistor R177 with a resistance of 4.7kΩ and a sixth resistor R179, for example, a chip resistor with a nominal value of 0Ω. The first end of the fifth resistor R177 is connected to the external power supply input terminal "+5V". The second end of the fifth resistor R177, the reset output port RESET of the reset chip, and the first end of the sixth resistor R179 are coupled to the fourth node. The second end of the sixth resistor R179 serves as the power-on control signal or power-off control signal output terminal of the reset circuit.

[0045] like Figure 2 As shown, the reset circuit also includes a reset chip power supply filter sub-circuit, which includes, for example, a capacitor C213 with a capacitance of 0.1μF, used to decouple and filter the 5V power supply of the reset chip U21 to ensure stable chip operation.

[0046] In one possible implementation, the optocoupler chip is further configured to output a second control signal to a reset circuit in response to a second external control signal; the reset chip is further configured to output a power-on control signal or a power-off control signal to the controlled power supply chip in response to the second control signal.

[0047] Therefore, this embodiment provides a dual control signal redundancy design to improve reliability. For example, the power chip is powered on as long as either the first external control signal or the second external control signal is at a high level, and the power chip is powered off when both the first external control signal and the second external control signal are at a low level.

[0048] In one possible implementation, the second channel of the optocoupler chip includes a second control voltage receiving port, a second external control signal receiving port, and a second control signal output port. The optocoupler circuit further includes a second primary-side driving sub-circuit, which includes a seventh resistor, an eighth resistor, a third diode, and a fifth capacitor. The first end of the seventh resistor is connected to the input terminal of the second control voltage. The second end of the seventh resistor, the first end of the fifth capacitor, the cathode of the third diode, the first end of the eighth resistor, and the second control voltage receiving port are coupled to a fifth node. The second end of the fifth capacitor, the anode of the third diode, the second end of the eighth resistor, and the second external control signal receiving port are coupled to a sixth node. The sixth node is connected to the input terminal of the second external control signal.

[0049] Continuing with the previous example, such as Figure 1As shown, the second channel of optocoupler chip B2 includes a second control voltage receiving port 4, a second external control signal receiving port 3, and a second control signal output port 6. The second primary-side driver sub-circuit includes a seventh resistor R158, an eighth resistor R159, a third diode 10, and a fifth capacitor C280. The first end of the seventh resistor R158 is connected to the input terminal of the first control voltage, "Control 3.3V power supply" (the first control voltage is 3.3V). The second end of the seventh resistor R158, the first end of the fifth capacitor C280, the cathode of the third diode 10, the first end of the eighth resistor R159, and the second control voltage receiving port 4 are coupled to the fifth node. The second end of the first capacitor R155, the anode of the third diode 10, the second end of the eighth resistor R159, and the second external control signal receiving port 3 are coupled to the sixth node. The second node is connected to the input terminal of the second external control signal, "Control 2". The resistance of the seventh resistor R158 is, for example, 120Ω; the resistance of the eighth resistor R159 is, for example, 4.7kΩ; the third diode 10 is, for example, a 1N4148 type small high-speed switching diode; and the capacitance of the fifth capacitor C280 is, for example, 330pF. It can be seen that the design of the second primary-side drive sub-circuit is the same as that of the first primary-side drive sub-circuit.

[0050] In one possible implementation, the optocoupler circuit further includes a second secondary output sub-circuit, which includes a ninth resistor. The first end of the ninth resistor is connected to the input terminal of an external power supply, and the second end of the ninth resistor is connected to the second control signal output port.

[0051] The second secondary output sub-circuit provides a pull-up for the open-collector second control signal "control2_CRTL", converting the current signal to a 5V digital level. Continuing the previous example, as... Figure 1 As shown, the second secondary output sub-circuit includes a ninth resistor R160. The first terminal of the ninth resistor R160 is connected to the external power supply terminal "+5V", and the second terminal is connected to the second control signal output port 6, serving as the second control signal output terminal of the optocoupler circuit. The resistance value of the third resistor R157 is, for example, 510Ω. It can be seen that the design of the second secondary output sub-circuit is the same as that of the first secondary output sub-circuit.

[0052] In one possible implementation, the control signal conditioning sub-circuit further includes a fourth diode, the anode of which serves as the second control signal input terminal of the reset circuit, and the cathode of which is connected to the first terminal of the fourth resistor. The fourth diode prevents signal backflow.

[0053] Continuing with the previous example, such as Figure 2As shown, the anode of the fourth diode V4 serves as the second control signal input terminal of the reset circuit, and the cathode of the fourth diode V4 is connected to the first terminal of the fourth resistor R178.

[0054] Figure 2 As shown, the second diode V5 and the fourth diode V4 form a diode OR gate, with the anodes connected to two control signal inputs respectively, and the cathodes connected to the reset control port MR of the reset chip U21.

[0055] If the first external control signal is high and the second external control signal is high, then the second diode V5 and the fourth diode V4 are both turned on, the reset control port MR of the reset chip U21 is pulled high, the reset output port RESET of the reset chip U21 outputs high, the output terminal "RESET_power" of the reset circuit outputs a high-level power-on control signal, and the subsequent power supply chip is powered on. If the first external control signal is high and the second external control signal is low, then the second diode V5 is turned on and the fourth diode V4 is turned off. The reset control port MR of the reset chip U21 is pulled high, the reset output port RESET of the reset chip U21 outputs high, and the output terminal "RESET_power" of the reset circuit outputs a high-level power-on control signal, and the subsequent power supply chip is powered on. If the first external control signal is low and the second external control signal is high, then the second diode V5 is cut off and the fourth diode V4 is turned on. The reset control port MR of the reset chip U21 is pulled high, the reset output port RESET of the reset chip U21 outputs high, and the output terminal "RESET_power" of the reset circuit outputs a high-level power-on control signal, and the subsequent power supply chip is powered on. If the first external control signal is low and the second external control signal is low, then both the second diode V5 and the fourth diode V4 are cut off. The reset control port MR of the reset chip U21 is pulled down to a low level and grounded. The reset output port RESET of the reset chip U21 outputs a low level. The output terminal "RESET_Power" of the reset circuit outputs a low-level power-down control signal, and the subsequent power supply chip is powered down.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A power switch circuit, characterized in that, Includes optocoupler circuit and reset circuit. The optocoupler circuit includes an optocoupler chip, which is used to output a first control signal to the reset circuit in response to a first external control signal. The reset circuit includes a reset chip, which is used to output a power-on control signal or a power-off control signal to the controlled power chip in response to the first control signal.

2. The power switch circuit according to claim 1, characterized in that, The first channel of the optocoupler chip includes a first control voltage receiving port, a first external control signal receiving port, and a first control signal output port. The optocoupler circuit includes a first primary-side driving sub-circuit, which includes a first resistor, a second resistor, a first diode, and a first capacitor. The first end of the first resistor is connected to the input terminal of the first control voltage. The second end of the first resistor, the first end of the first capacitor, the cathode of the first diode, the first end of the second resistor, and the first control voltage receiving port are coupled to a first node. The second end of the first capacitor, the anode of the first diode, the second end of the second resistor, and the first external control signal receiving port are coupled to a second node. The second node is connected to the input terminal of the first external control signal.

3. The power switch circuit according to claim 2, characterized in that, The optocoupler circuit further includes a first secondary output sub-circuit, which includes a third resistor. The first end of the third resistor is connected to the input terminal of an external power supply, and the second end of the third resistor is connected to a first control signal output port.

4. The power switch circuit according to claim 3, characterized in that, The optocoupler circuit also includes a secondary-side filter sub-circuit, which includes a second capacitor and a third capacitor. The first terminal of the second capacitor and the first terminal of the third capacitor are respectively connected to the input terminal of an external power supply, and the second terminal of the second capacitor and the second terminal of the third capacitor are respectively grounded.

5. The power switch circuit according to claim 2, characterized in that, The reset circuit includes a control signal conditioning sub-circuit, which includes a second diode, a fourth resistor, and a fourth capacitor. The anode of the second diode serves as the first control signal input terminal of the reset circuit, and the cathode of the second diode is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor, the first terminal of the fourth capacitor, and the reset control port of the reset chip are coupled to a third node, and the second terminal of the fourth capacitor is grounded.

6. The power switch circuit according to claim 1, characterized in that, The reset circuit includes a reset output drive sub-circuit, which includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the input terminal of an external power supply. The second end of the fifth resistor, the reset output port of the reset chip, and the first end of the sixth resistor are coupled to a fourth node. The second end of the sixth resistor serves as the output terminal of the power-on control signal or power-off control signal of the reset circuit.

7. The power switch circuit according to claim 5, characterized in that, The optocoupler chip is also used to output a second control signal to the reset circuit in response to the second external control signal; the reset chip is also used to output a power-on control signal or a power-off control signal to the controlled power supply chip in response to the second control signal.

8. The power switch circuit according to claim 7, characterized in that, The second channel of the optocoupler chip includes a second control voltage receiving port, a second external control signal receiving port, and a second control signal output port. The optocoupler circuit also includes a second primary-side driving sub-circuit, which includes a seventh resistor, an eighth resistor, a third diode, and a fifth capacitor. The first end of the seventh resistor is connected to the input terminal of the second control voltage. The second end of the seventh resistor, the first end of the fifth capacitor, the cathode of the third diode, the first end of the eighth resistor, and the second control voltage receiving port are coupled to a fifth node. The second end of the fifth capacitor, the anode of the third diode, the second end of the eighth resistor, and the second external control signal receiving port are coupled to a sixth node. The sixth node is connected to the input terminal of the second external control signal.

9. The power switch circuit according to claim 8, characterized in that, The optocoupler circuit further includes a second secondary output sub-circuit, which includes a ninth resistor. The first end of the ninth resistor is connected to the input terminal of an external power supply, and the second end of the ninth resistor is connected to the second control signal output port.

10. The power switch circuit according to claim 7, characterized in that, The control signal conditioning sub-circuit also includes a fourth diode, the anode of which serves as the second control signal input terminal of the reset circuit, and the cathode of which is connected to the first terminal of the fourth resistor.

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