Power supply control circuit and power supply

Abstract

The utility model provides a power supply control circuit and a power supply. The power supply control circuit comprises a switching circuit and a control circuit. When the power supply output end is in a disconnected state, the control circuit controls the switching circuit to be disconnected and controls the voltage between the power supply input end and the switching circuit to be maintained at a preset voltage; when the power supply output end is in a connection state, the control circuit controls the switch circuit to be switched on, so that the power supply circuit outputs a preset voltage for a preset duration through the power supply output end; therefore, after a preset duration, the control circuit controls the voltage between the power supply input end and the switching circuit to climb to the rated voltage of the power supply circuit and to be output through the power supply output end. By means of the mode, before the power input end and the power output end are conducted, surge current generated instantly is reduced when the switching circuit is conducted by increasing the voltage at the front end of the switching circuit, then the circuit is protected, components are prevented from being damaged, and reliability is improved.

Description

Technical Field

[0001] The embodiments disclosed in this application relate to the field of power supply technology, and more specifically, to power control circuits and power supplies. Background Technology

[0002] Hot-swap technology refers to inserting modules, cards, or connectors into a system while it is electrically conductive, without affecting system operation. Once equipment is put into operation, it must run day and night. When disassembling, repairing, maintaining, or expanding components of these devices, the system cannot be shut down; downtime means significant economic losses. Therefore, hot-swapping is also necessary for power supplies during equipment use.

[0003] In some power supplies that require hot-swapping, or in some adapter power supplies with magnetic output terminals, the system end has a large capacitive load. Frequent and repeated hot-swapping or intermittent connection can cause the output terminals to arc, turn black and accumulate carbon, thereby increasing the contact resistance, generating very large losses, and eventually causing the terminals to burn and fail. In severe cases, it may even pose a fire hazard. Utility Model Content

[0004] According to embodiments of this application, this application proposes a power control circuit and a power supply to solve the problem that the surge current generated at the moment of conduction during the hot-plugging process of the power supply can damage the components in the circuit, thereby protecting the circuit safety and improving the reliability of the equipment.

[0005] The first aspect of this application provides a power control circuit applied to a power supply, the power supply including a power input terminal, a power output terminal, and a power circuit connected to the power input terminal; the power control circuit includes: a switching circuit connected between the power input terminal and the power output terminal; and a control circuit connected to the switching circuit and the power output terminal; wherein the control circuit is also connected between the power input terminal and the switching circuit; when the power output terminal is in an open state, the control circuit controls the switching circuit to open and controls the voltage between the power input terminal and the switching circuit to be maintained at a preset voltage; when the power output terminal is in an open state, the control circuit controls the switching circuit to open, so that the power circuit outputs a preset voltage through the power output terminal for a preset time; thereby, after the preset time, the control circuit controls the voltage between the power input terminal and the switching circuit to rise to the rated voltage of the power circuit and output through the power output terminal.

[0006] In some embodiments, the control circuit turns on the control switch circuit after the power output terminal is in the connected state for a target duration, wherein the target duration is longer than a preset duration.

[0007] In some embodiments, the power output terminal includes an in-position signal pin, and the control circuit is connected to the in-position signal pin, thereby connecting the control circuit to the power output terminal; when the in-position signal pin is high, it indicates that the power output terminal is in an off state, and when the in-position signal pin is low or grounded, it indicates that the power output terminal is in a connected state.

[0008] In some embodiments, the preset voltage is less than or equal to half of the rated voltage of the power supply circuit.

[0009] In some embodiments, the power control circuit further includes an overcurrent protection circuit connected between the power input terminal and the power output terminal, and connected to the control circuit.

[0010] In some embodiments, the power control circuit further includes an over-temperature protection circuit connected to the control circuit.

[0011] In some embodiments, the power control circuit further includes a compensation circuit connected between the control circuit and the power input terminal.

[0012] In some embodiments, the power control circuit further includes a static discharge protection circuit connected between the control circuit and the power output terminal.

[0013] In some embodiments, the control circuit includes an integrated chip, which includes a first preset pin, a second preset pin, and a third preset pin. The first preset pin is connected to a switching circuit, the second preset pin is connected to an in-situ signal pin of the power output terminal, and the third preset pin is connected between the power input terminal and the switching circuit.

[0014] In some embodiments, the control circuit includes a comparator and an operational amplifier, wherein the input of the comparator is connected to the in-situ signal pin of the power supply output, the output of the comparator is connected to the input of the operational amplifier and a switching circuit, and the output of the operational amplifier is connected between the power supply input and the switching circuit.

[0015] A second aspect of this application provides a power supply comprising: a power supply circuit, a voltage input terminal connected to the power supply circuit, a power output terminal, and a power control circuit as described in any of the embodiments above, connected between the power input terminal and the power output terminal.

[0016] The power control circuit and power supply provided in this application maintain the front-end voltage of the switching circuit at a preset voltage value before the switching circuit is turned on, so that the voltage difference between the front and back ends of the switching circuit is small before the switching circuit is turned on. This avoids the generation of a large surge current at the moment the switching circuit is turned on, which could damage the switching circuit or other components in the circuit, thereby protecting the circuit and improving the reliability of the system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] in:

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the power control circuit provided in this application;

[0020] Figure 2 This is a schematic diagram of the structure of the second embodiment of the power control circuit provided in this application;

[0021] Figure 3 This is a schematic diagram of an embodiment of the overcurrent protection circuit provided in this application;

[0022] Figure 4 This is a schematic diagram of the third embodiment of the power control circuit provided in this application;

[0023] Figure 5 This is a schematic diagram of an embodiment of the over-temperature protection circuit provided in this application;

[0024] Figure 6 This is a schematic diagram of the fourth embodiment of the power control circuit provided in this application;

[0025] Figure 7 This is a schematic diagram of the structure of an embodiment of the compensation circuit provided in this application;

[0026] Figure 8 This is a schematic diagram of the fifth embodiment of the power control circuit provided in this application;

[0027] Figure 9 This is a schematic diagram of an embodiment of the electrostatic discharge protection circuit provided in this application;

[0028] Figure 10 This is a schematic diagram of the structure of the first embodiment of the control circuit provided in this application;

[0029] Figure 11 This is a schematic diagram of the structure of the second embodiment of the control circuit provided in this application;

[0030] Figure 12 This is a schematic diagram of the sixth embodiment of the power control circuit provided in this application;

[0031] Figure 13 This is a control timing diagram of an embodiment of the power control circuit provided in this application;

[0032] Figure 14 This is a schematic diagram of a power supply embodiment provided in this application.

[0033] Icon labels:

[0034] 100. Power control circuit; 10. Switching circuit; 20. Control circuit; 21. Integrated chip; 211. First preset pin; 212. Second preset pin; 213. Third preset pin; 22. Comparator; 23. Operational amplifier; 30. Overcurrent protection circuit; 40. Overtemperature protection circuit; 50. Compensation circuit; 60. Static discharge protection circuit; 61. Electrostatic protector; 300. Power supply; 310. Power input terminal; 320. Power output terminal; 330. Power supply circuit; 321. In-position signal pin. Detailed Implementation

[0035] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0037] The first aspect of this application provides a power control circuit 100, applied to a power supply 300, such as... Figure 1 As shown, Figure 1This is a schematic diagram of the first embodiment of the power control circuit provided in this application; the power supply 300 includes a power circuit 330, a power input terminal 310, and a power output terminal 320, wherein the power circuit 330 is connected to the power input terminal 310; the power control circuit 100 includes a switching circuit 10 and a control circuit 20; wherein the switching circuit 10 is connected between the power input terminal 310 and the power output terminal 320; the control circuit 20 is connected to the switching circuit 10 and the power output terminal 320; wherein the control circuit 20 is also connected to the power input terminal 310 and the switching circuit 10. The circuit is connected between the power input terminal 310 and the switch circuit 10. When the power output terminal 320 is in the off state, the control circuit 20 controls the switch circuit 10 to open and controls the voltage between the power input terminal 310 and the switch circuit 10 to be maintained at a preset voltage. When the power output terminal 320 is in the connected state, the control circuit 20 controls the switch circuit 10 to open, so that the power circuit 330 outputs a preset voltage for a preset time through the power output terminal 320. Thus, after the preset time, the control circuit 20 controls the voltage between the power input terminal 310 and the switch circuit 10 to rise to the rated voltage of the power circuit 330.

[0038] The preset duration can be 50 milliseconds or less. The control circuit 20 controls the switch circuit 10 to conduct, so that the power supply circuit 330 outputs a preset voltage for a preset duration through the power output terminal 320. After the preset duration, the control circuit 20 controls the voltage between the power input terminal 310 and the switch circuit 10 to rise to the rated voltage of the power supply circuit 330. That is to say, the preset voltage is less than the rated voltage of the power supply circuit 330.

[0039] Both the power input terminal 310 and the power output terminal 320 include positive and negative pins (not shown in the figure). For example, the power input terminal 310 includes a positive power input pin and a negative power input pin, and the power output terminal 320 includes a positive power output pin and a negative power output pin. The specific connection depends on the actual design and will not be described in detail here.

[0040] In this way, when the power output terminal 320 is not connected, the switching circuit 10 is still in the open state. The voltage before the switching circuit 10, that is, the voltage between the power input terminal 310 and the switching circuit 10, is maintained at a preset voltage. When the power output terminal 320 is connected, that is, after the power output terminal 320 is connected, the switching circuit 10 will be turned on and provide the preset voltage output through the power output terminal 320. After the preset voltage is output for a preset time, for example, after tens of milliseconds, the output voltage is controlled to rise to the rated voltage of the power circuit 330, so as to avoid directly turning on the switching circuit 10 under the rated voltage output. Since the switching circuit 10 is turned on when the preset voltage (less than the rated voltage of the power circuit 330) is used, the surge current at the moment of turn-on is reduced, thereby greatly reducing the SOA (Safe Operating Area) requirements of the switching circuit 10 and improving the reliability of the switching circuit 10.

[0041] In some embodiments, the control circuit 20 controls the switching circuit 10 to turn on when the power output terminal 320 is in a connected state for a target duration, wherein the target duration is greater than the preset duration.

[0042] The target duration can be 50ms, or other values.

[0043] When the power output terminal 320 is in the off state, the control circuit 20 controls the switching circuit 10 to open and maintains the voltage between the power input terminal 310 and the switching circuit 10 at a preset voltage. At this time, the power output terminal 320 is initially in the connected state, for example, when the power output terminal 320 is connected to the terminal of the system host, or when the adapter's magnetic head terminal is attracted to the magnetic head of the system host. After a target duration, the control circuit 20 controls the switching circuit 10 to turn on. That is to say, during the process of the power output terminal 320 being in the connected state, from the time the power output terminal 320 is initially in the connected state to the time the control circuit 20 controls the switching circuit 10 to turn on, there is a target duration. After the target duration, since the power output terminal 320 is in the connected state and the switching circuit 10 is turned on, the power output terminal 320 outputs the preset voltage.

[0044] In some embodiments, such as Figure 1 As shown, the power output terminal 320 includes an in-position signal pin 321. The control circuit 20 is connected to the in-position signal pin 321, thereby connecting the control circuit 20 to the power output terminal 320. When the in-position signal pin 321 is high, it indicates that the power output terminal 320 is in the off state. When the in-position signal pin 321 is low or grounded, it indicates that the power output terminal 320 is in the connected state.

[0045] Understandably, the power output terminal 320 may also include a positive power output pin and a negative power output pin (not shown in the figure) to achieve output. By using the output signal when the power output terminal 320 is connected to the control circuit 20 via the presence signal pin 321, it is determined whether the power output terminal 320 is in a connected or disconnected state. Based on the connection state, the control circuit 20 performs relevant control operations to determine whether the charging circuit is connected.

[0046] In some embodiments, the preset voltage is less than or equal to half the rated voltage of the power supply circuit 330. For example, if the rated voltage of the power supply circuit 330 is 20V, the preset voltage can be 5V or 10V. Thus, by setting the voltage at the front end of the switching circuit 10 to the preset voltage before the charging circuit is turned on, the voltage difference between the front and rear ends of the switching circuit 10 will not be too large when the switching circuit 10 is turned on, thereby preventing excessive inrush current that could damage the switching circuit 10 or other components in the circuit, and improving the reliability of the charging system.

[0047] In some embodiments, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the second embodiment of the power control circuit provided in this application; wherein, the power control circuit 100 further includes: an overcurrent protection circuit 30, which is connected between the power input terminal 310 and the power output terminal 320, and is connected to the control circuit 20.

[0048] In one specific embodiment, such as Figure 3 As shown, Figure 3 This is a schematic diagram of an embodiment of the overcurrent protection circuit provided in this application. Specifically, the overcurrent protection circuit 30 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first and second terminals of the first capacitor C1 are coupled to the control circuit 20. The first terminal of the first resistor R1 is coupled to the first terminal of the first capacitor C1 and the power input terminal 310, for example, the negative power input pin of the power input terminal 310. The second terminal of the first resistor R1 is the power output terminal 320, for example, the negative power output pin of the power output terminal 320. The first terminal of the second resistor R2 is coupled to the first terminal of the first capacitor C1, and the second terminal of the second resistor R2 is coupled to the second terminal of the first resistor R1.

[0049] In some embodiments, such as Figure 4 As shown, Figure 4 This is a schematic diagram of the third embodiment of the power control circuit provided in this application; the power control circuit 100 also includes: an over-temperature protection circuit 40, which is connected to the control circuit 20.

[0050] In one specific embodiment, such as Figure 5 As shown, Figure 5This is a schematic diagram of an embodiment of the over-temperature protection circuit provided in this application; specifically, the over-temperature protection circuit 40 includes: a thermistor NTC and a third resistor R3; wherein, the first end of the thermistor NTC is coupled to the control circuit 20; the first end of the third resistor R3 is coupled to the thermistor NTC, and the second end of the third resistor R3 is coupled to the control circuit 20 and grounded.

[0051] In some embodiments, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the fourth embodiment of the power control circuit provided in this application; the power control circuit 100 also includes: a compensation circuit 50, which is connected between the control circuit 20 and the power input terminal 310.

[0052] For example, compensation circuit 50 is connected between control circuit 20 and the positive power input pin of power input terminal 310. In a specific embodiment, such as Figure 7 As shown, Figure 7 This is a schematic diagram of an embodiment of the compensation circuit provided in this application; specifically, the compensation circuit 50 includes: an optocoupler OP, a second capacitor C2, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a sixth resistor R6, a fourth capacitor C4, a seventh resistor R7, and a fifth capacitor C5; specifically, the first terminal of the optocoupler OP is coupled to the first terminal of the second capacitor C2, the second terminal of the optocoupler OP is coupled to the control circuit 20, and the third terminal of the optocoupler OP is grounded; the first terminal of the fourth resistor R4 is coupled to the second terminal of the second capacitor C2; the first terminal of the fifth resistor R5 is coupled to the first terminal of the optocoupler OP, and the second terminal of the fifth resistor R5 is coupled to the fourth resistor R4. The second terminal; the second terminal of the fourth resistor R4, the second terminal of the fifth resistor R5, the first terminal of the third capacitor C3, and the control circuit 20 are coupled together to the power input terminal 310, for example, the positive power input pin of the power input terminal 310; the second terminal of the third capacitor C3 is grounded; the first terminal of the sixth resistor R6 is coupled to the second terminal of the optocoupler OP; the first terminal of the fourth capacitor C4 is coupled to the second terminal of the sixth resistor R6, and the second terminal of the fourth capacitor C4 is coupled to the control circuit 20; the first terminal of the seventh resistor R7 is coupled to the second terminal of the optocoupler OP; the first terminal of the fifth capacitor C5 is coupled to the second terminal of the ground resistor, and the second terminal of the fifth capacitor C5 is coupled to the control circuit 20.

[0053] In some embodiments, such as Figure 8 As shown, Figure 8 This is a schematic diagram of the fifth embodiment of the power control circuit provided in this application; the power control circuit 100 also includes: a static discharge protection circuit 60, which is connected between the control circuit 20 and the power output terminal 320.

[0054] For example, the static discharge protection circuit 60 is connected between the control circuit 20 and the presence signal pin 321 of the power output terminal 320. In a specific embodiment, such as Figure 9 As shown, Figure 9 This is a schematic diagram of an embodiment of the electrostatic discharge protection circuit 60 provided in this application. Specifically, the electrostatic discharge protection circuit 60 includes an electrostatic discharge protector 61 and a sixth capacitor C6. The first terminal of the electrostatic discharge protector 61 is coupled to the presence signal pin 321 of the control circuit 20 and the power output terminal 320, and the second terminal of the electrostatic discharge protector 61 is grounded. The first terminal of the sixth capacitor C6 is coupled to the first terminal of the electrostatic discharge protector 61, and the second terminal of the sixth capacitor C6 is grounded. For example, the electrostatic discharge protector 61 can be made of components such as a TVS diode, a varistor (MOV), an MLCC (multilayer ceramic capacitor), or an ESD suppressor.

[0055] Through the above embodiments, the power control circuit 100 can realize functions such as overcurrent protection, overtemperature protection, circuit compensation feedback, and electrostatic protection.

[0056] In some embodiments, such as Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of the first embodiment of the control circuit provided in this application; the control circuit 20 includes an integrated chip 21, the integrated chip 21 includes a first preset pin 211, a second preset pin 212 and a third preset pin 213, the first preset pin 211 is connected to the switch circuit 10, the second preset pin 212 is connected to the presence signal pin 321 of the power output terminal 320, and the third preset pin 213 is connected between the power input terminal 310 and the switch circuit 10.

[0057] The integrated chip 21 can be a PD protocol IC that includes an MCU. In this case, the first preset pin 211 can be the DRV pin of the integrated chip 21, the second preset pin 212 can be the CC2 pin of the integrated chip 21, and the third preset pin 213 can be the OPTO pin of the integrated chip 21. The integrated chip 21 may also include other pins, such as the IFB pin, VFB pin, etc., which will not be described in detail here.

[0058] In some embodiments, such as Figure 11 As shown, Figure 11 This is a schematic diagram of the second embodiment of the control circuit provided in this application. The control circuit 20 includes a comparator 22 and an operational amplifier 23. The input terminal of the comparator 22 is connected to the in-situ signal pin 321 of the power output terminal 320. The output terminal of the comparator 22 is connected to the input terminal of the operational amplifier 23 and the switching circuit 10. The output terminal of the operational amplifier 23 is connected between the power input terminal 310 and the switching circuit 10. VREF (Voltage Reference) is the reference voltage.

[0059] Understandably, in the power supply control circuit 100, the comparator 22 in the control circuit 20, combined with the operational amplifier 23, controls the various circuits. The portions of each circuit coupled to the control circuit 20 are connected to... Figure 11 The input of comparator 22 in the [process]. For example, combined with [other components]. Figure 2 and Figure 3 According to the proposed solution, Figure 2 The part where the overcurrent protection circuit 30 is coupled to the control circuit 20 is... Figure 3 The first and second terminals of the first capacitor C1 are coupled to Figure 11 The input terminal of comparator 22.

[0060] It is understood that in other embodiments, the number of comparators 22 may be multiple, such as two or more; in another embodiment, the operational amplifier 23 may be an LM431 chip, which is an adjustable three-terminal voltage reference chip with high accuracy, low temperature drift, low dynamic impedance and good noise characteristics.

[0061] See Figure 12 As shown, Figure 12 This is a schematic diagram of the sixth embodiment of the power control circuit provided in this application; wherein, the power control circuit 100 further includes: a seventh capacitor C7, an eighth resistor R8, an eighth capacitor C8, a ninth resistor R9, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a filter capacitor EC. For specific connection relationships, please refer to... Figure 12 As shown. In this scheme, the switching circuit 10 includes a switching transistor Q1. The control circuit 20 includes an integrated chip 21. The type of the switching transistor Q1 is not limited here.

[0062] Understandable combination Figure 10 In the proposed solution, the first preset pin 211 is... Figure 12 The DRV pin; the second preset pin 212 is Figure 12 The CC2 pin; the third preset pin 213 is Figure 12 The OPTO pin is used in this embodiment. In one embodiment, the integrated chip 21 is a PD protocol IC including an MCU, which detects the presence signal (i.e., ...) of the power output terminal 320 via the CC2 pin. Figure 12 The Present in the middle controls the switching circuit 10 (i.e., Figure 12 The power supply control circuit 100 controls the switching of transistor Q1 (Q1) and adjusts the output voltage through compensation circuit 50. It also provides overvoltage, undervoltage, overcurrent, and overtemperature protection. Figure 12The power input terminal 310 has two pins, Vm+ and Vm-, which are the positive and negative power input pins, respectively. The power supply circuit 330 is coupled through the two pins Vm+ and Vm-. The power output terminal 320 has two pins, Vout+ and Vout-, which are the positive and negative power output pins, respectively. The FB pin is coupled to the external startup voltage.

[0063] When the power output terminal 320 is disconnected and in the connected state, the presence signal CC2 of the integrated chip 21 is in a high level state. The integrated chip 21 controls the switching transistor Q1 to be in the OFF state (i.e., disconnected state), and the compensation circuit 50 controls the voltage at the front end of the switching transistor Q1 (i.e., the voltage at the front end of the switching transistor Q1) to be high. Figure 12 The voltage at the left end of the switching transistor Q1 is maintained at a preset voltage, such as 5V or a voltage less than half the rated voltage of the power supply circuit 330. When the power output terminal 320 is connected to the terminal of the system host, or when the adapter magnetic head terminal is attracted to the magnetic head of the system host (same as when the power output terminal 320 is connected to the system host), the presence signal pin CC2 of the integrated chip 21 is pulled down to a certain low level by the pull-down resistor, or directly pulled down to ground Vout-, and remains there for a target duration, for example, 50ms, that is, the presence signal pin CC2 remains pulled low for 50ms. After that, the integrated chip 21 controls the switching transistor Q1 to enter the ON state (i.e., the conduction state), and the power output terminal 320 outputs 5V or a voltage less than half the rated voltage. After another preset duration, such as 50ms, the integrated chip 21 controls the compensation circuit 50 to adjust the output voltage of the power supply circuit 330 and quickly rise to the rated voltage. This whole process is the circuit turn-on control process. When the output terminal or magnetic head is suddenly disconnected from the connected state, the presence signal CC2 of the integrated chip 21 immediately rises to a high level. The integrated chip 21 immediately controls the switching transistor Q1 to enter the OFF state. The voltage after the switching transistor Q1 drops rapidly to 0V, and the compensation circuit 50 controls the voltage in front of the switching transistor Q1 to drop from the rated voltage to 5V or less than half of the rated voltage.

[0064] like Figure 13 As shown, Figure 13 This is a control timing diagram of an embodiment of the power control circuit 100 provided in this application; it can be understood that, in using the above embodiment, after connecting to the power output terminal 320, as... Figure 12 The in-situ signal CC2 in the system is connected to the pull-down resistor (i.e., Figure 12The eighth resistor R8 in the circuit is connected to the power output terminal 320. After a 50ms delay, the switching circuit 10 outputs a preset voltage, which is 5-10V. After outputting the preset voltage, there is a 50ms delay, and the output voltage of the power output terminal 320 is controlled to rise to the rated voltage of 20V. After the power output terminal 320 is disconnected, the in-position signal CC2 also disconnects the pull-down resistor at the system end, the switching circuit 10 is disconnected, the voltage at the back end of the switching circuit 10 drops to 0V, and the voltage at the front end of the switching circuit 10 returns to the preset voltage.

[0065] The second aspect of this application provides a power supply of 300, such as Figure 14 As shown, Figure 14 This is a schematic diagram of a power supply 300 according to an embodiment of the present application; the power supply 300 includes: a power supply circuit 330 with a power input terminal 310, a power output terminal 320, and a power control circuit 100 connected between the power input terminal 310 and the power output terminal 320, wherein the power control circuit 100 is the power control circuit 100 described in any of the above embodiments.

[0066] The power control circuit 100 includes: a switching circuit 10 connected between a power input terminal 310 and a power output terminal 320; and a control circuit 20 connected to the switching circuit 10 and the power output terminal 320. The control circuit 20 is also connected between the power input terminal 310 and the switching circuit 10. When the power output terminal 320 is in an open state, the control circuit 20 controls the switching circuit 10 to open and maintains the voltage between the power input terminal 310 and the switching circuit 10 at a preset voltage. When the power output terminal 320 is in a connected state, the control circuit 20 controls the switching circuit 10 to open, so that the power input terminal 310 outputs the preset voltage through the power output terminal 320 for a preset duration. After the preset duration, the control circuit 20 controls the voltage between the power input terminal 310 and the switching circuit 10 to rise to the rated voltage of the power circuit 330. By means of the above method, the front-end voltage of the switching circuit 10 is maintained at a preset voltage value before the switching circuit 10 is turned on, so that the voltage difference between the front and back ends of the switching circuit 10 is small before the switching circuit 10 is turned on. This avoids the generation of a large surge current at the moment the switching circuit 10 is turned on, which could damage the switching circuit 10 or other components in the circuit, thereby achieving the purpose of protecting the circuit and improving the reliability of the system.

[0067] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0068] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed methods and related devices can be implemented in other ways. For example, the related device implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication disconnection shown or discussed may be indirect coupling or communication disconnection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0070] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0071] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. A power supply control circuit, characterized in that, Applied to a power supply, the power supply includes a power input terminal, a power output terminal, and a power circuit connected to the power input terminal; The power control circuit includes: A switching circuit is connected between the power input terminal and the power output terminal; A control circuit is connected to the switching circuit and the power output terminal; The control circuit is also connected to the power input terminal and the switching circuit. When the power output terminal is in the off state, the control circuit controls the switching circuit to open and controls the voltage between the power input terminal and the switching circuit to be maintained at a preset voltage. When the power output terminal is in the connected state, the control circuit controls the switching circuit to turn on, so that the power circuit outputs the preset voltage for a preset duration through the power output terminal; thereby, after the preset duration, the control circuit controls the voltage between the power input terminal and the switching circuit to rise to the rated voltage of the power circuit and output it through the power output terminal.

2. The power control circuit according to claim 1, characterized in that, The control circuit controls the switching circuit to turn on after the power output terminal is in the connected state for a target duration, wherein the target duration is greater than the preset duration.

3. The power control circuit according to claim 1, characterized in that, The power output terminal includes an in-position signal pin, and the control circuit is connected to the in-position signal pin, thereby connecting the control circuit to the power output terminal. When the presence signal pin is high, it indicates that the power output terminal is in a disconnected state; when the presence signal pin is low or grounded, it indicates that the power output terminal is in a connected state.

4. The power control circuit according to claim 3, characterized in that, The preset voltage is less than or equal to half of the rated voltage of the power supply circuit.

5. The power control circuit according to claim 1, characterized in that, The power control circuit also includes: An overcurrent protection circuit is connected between the power input terminal and the power output terminal, and is also connected to the control circuit.

6. The power control circuit according to claim 1, characterized in that, The power control circuit also includes: An over-temperature protection circuit is connected to the control circuit.

7. The power control circuit according to claim 1, characterized in that, The power control circuit also includes: A compensation circuit is connected between the control circuit and the power input terminal.

8. The power control circuit according to claim 1, characterized in that, The power control circuit also includes: A static discharge protection circuit is connected between the control circuit and the power output terminal.

9. The power control circuit according to any one of claims 1-8, characterized in that, The control circuit includes an integrated chip, which includes a first preset pin, a second preset pin, and a third preset pin. The first preset pin is connected to the switching circuit, the second preset pin is connected to the presence signal pin of the power output terminal, and the third preset pin is connected between the power input terminal and the switching circuit.

10. The power control circuit according to any one of claims 1-8, characterized in that, The control circuit includes a comparator and an operational amplifier, wherein the input terminal of the comparator is connected to the in-situ signal pin of the power supply output terminal, the output terminal of the comparator is connected to the input terminal of the operational amplifier and the switching circuit, and the output terminal of the operational amplifier is connected between the power supply input terminal and the switching circuit.

11. A power supply, characterized in that, It includes a power supply circuit, a voltage input terminal connected to the power supply circuit, a power output terminal, and a power control circuit as described in any one of claims 1-10 connected between the power input terminal and the power output terminal.

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