Power supply control circuit, control method and power supply

Abstract

The invention discloses a power supply control circuit, a control method and a power supply, and relates to the technical field of power supply control. The circuit comprises an adjusting sub-circuit, a charging sub-circuit, a first power supply and a common end, the power supply module is protected through the power supply control circuit with a relatively simple structure, and compared with the existing modes of adding an isolation diode at the output end of the power supply module or pre-charging and the like, the power supply control circuit provided by the embodiment of the invention realizes power supply control and protection of the power supply module by adjusting the on-off state of the charging sub-circuit; according to the invention, power loss can be reduced, normal work of the power supply module can be ensured, and the phenomenon of current backward flowing during hot plugging of the power supply module can be prevented, thereby solving the problem of sparking phenomenon during replacement of the power supply control circuit in an uninterruptible power state.

Description

Technical Field

[0001] This application relates to the technical field of power control, and particularly to a power control circuit, a control method, and a power supply. Background Art

[0002] Due to the need for uninterrupted maintenance, the power supply system requires that the power module has the function of hot plugging or uninterrupted maintenance. Because the bus is live, and there are always a large number of filter capacitors and other devices at the output of the power module, there will inevitably be a phenomenon of instantaneous current backflow when replacing the module, and even damage the connection terminals.

[0003] Currently, methods to prevent or reduce the harm of current backflow include adding isolation diodes or pre-charging at the output end of the power module.

[0004] However, connecting an isolation diode in series at the output end to prevent current backflow has a large power loss and is not suitable for power modules with large current output. The pre-charging method to prevent backflow generally requires additional long pins or relays to pre-charge the internal capacitors of the power module through a power resistor. This operation is relatively complex and cannot completely solve the problem of arcing when the pins contact the live part of the bus. Summary of the Invention

[0005] In view of this, this application provides a power control circuit, a control method, and a power supply, which can reduce power loss, ensure the normal operation of the power module, prevent the occurrence of current backflow during hot plugging of the power module, and thus solve the problem of arcing when replacing the power control circuit in the non-powered-off state.

[0006] Specifically, the following technical solutions are included:

[0007] In a first aspect, this application provides a power control circuit, where the control circuit includes an adjustment sub-circuit, a charging sub-circuit, a first power supply, and a common terminal;

[0008] The adjustment sub-circuit is respectively connected to the first power supply, the common terminal, and one end of the charging sub-circuit. The adjustment sub-circuit is configured to, when replacing the power control circuit in the non-powered-off state, in response to the voltage signal being greater than a first voltage threshold, output a low level to the charging sub-circuit, control the charging sub-circuit to be disconnected from the common terminal to prevent current backflow, and after the power control circuit operates normally, in response to the voltage signal being less than a second voltage threshold, output a high level to the charging sub-circuit, control the charging sub-circuit to be electrically connected to the common terminal;

[0009] The charging sub - circuit is connected to the common terminal. The charging sub - circuit includes a first output terminal and a second output terminal. The first output terminal and the second output terminal are connected to an external power supply module in an open - closeable manner. The first output terminal is connected to the detection terminal of the regulation sub - circuit. The charging sub - circuit is used to receive a low level output by the regulation sub - circuit to perform a resistance break to prevent current backflow when replacing the power control circuit in a non - power - off state, and in response to receiving a high level output by the regulation sub - circuit after the power control circuit works normally, to perform charging and energy storage. Wherein, when the first output terminal and the second output terminal are stably connected to the external power supply module, the power control circuit works normally.

[0010] In some embodiments, the regulation sub - circuit is further used to, when the first output terminal and the second output terminal are in an initial - power - on state with no output just connected to the external power supply module, in response to the voltage signal being greater than the first voltage threshold, output a low level to the charging sub - circuit to control the charging sub - circuit to break the resistance with the common terminal, so that the first output terminal is disconnected from the common terminal;

[0011] The charging sub - circuit is further used to, when the first output terminal and the second output terminal are in an initial - power - on state with no output just connected to the external power supply module, receive the low level of the regulation sub - circuit to perform a resistance break and disconnect the first output terminal from the common terminal.

[0012] In some embodiments, the regulation sub - circuit includes a first diode, a second diode, a first resistor, a second resistor, and an operational amplifier;

[0013] The inverting input terminal of the operational amplifier is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the common terminal, the non - inverting input terminal of the operational amplifier is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to the common terminal, the positive power supply pin of the operational amplifier is connected to the first power supply, and the negative power supply pin of the operational amplifier is connected to the common terminal;

[0014] One end of the first resistor is connected to a first node, the first node is located between the inverting input terminal of the operational amplifier and the positive electrode of the first diode, and the other end of the first resistor is connected to the detection terminal;

[0015] One end of the second resistor is connected to a second node, the second node is located between the non - inverting input terminal of the operational amplifier and the positive electrode of the second diode, and the other end of the second resistor is connected to the common terminal.

[0016] In some embodiments, the regulator sub - circuit further includes a third resistor and a first capacitor. One end of the third resistor is connected to the positive power supply pin of the operational amplifier, the other end of the third resistor is connected to the first power supply, one end of the first capacitor is connected to a third node, the third node is located between one end of the third resistor and the positive power supply pin of the operational amplifier, and the other end of the first capacitor is connected to the common terminal.

[0017] In some embodiments, the regulator sub - circuit further includes a fourth resistor. One end of the fourth resistor is connected to the amplified output of the operational amplifier, and the other end of the fourth resistor is connected to the charge sub - circuit.

[0018] In some embodiments, the charge sub - circuit includes a field - effect transistor. The drain of the field - effect transistor is connected to the first output terminal through a fourth node, the detection node is connected to the fourth node, the source of the field - effect transistor is connected to the common terminal, and the gate of the field - effect transistor is connected to the other end of the fourth resistor.

[0019] In some embodiments, the charge sub - circuit further includes a second capacitor. One end of the second capacitor is connected to the common terminal, and the other end of the second capacitor is connected to the second output terminal.

[0020] In some embodiments, the second capacitor is an electrolytic capacitor, one end of the second capacitor is the positive electrode, and the other end of the second capacitor is the negative electrode.

[0021] In a second aspect, the present application provides a power supply control method, which is applied to the power supply control circuit as described in the first aspect. The method includes:

[0022] When replacing the power supply control circuit in a non - power - off state, in response to the voltage signal being greater than a first voltage threshold, the regulator sub - circuit outputs a low level to the charge sub - circuit, controlling the charge sub - circuit to be disconnected from the common terminal to prevent current backflow. After the power supply control circuit works normally, in response to the voltage signal being less than a second voltage threshold, the regulator sub - circuit outputs a high level to the charge sub - circuit, controlling the charge sub - circuit to be electrically connected to the common terminal;

[0023] When replacing the power supply control circuit in a non - power - off state, the charge sub - circuit receives the low level output by the regulator sub - circuit and disconnects the resistor to prevent current backflow. In response to the power supply control circuit working normally, the charge sub - circuit receives the high level output by the regulator sub - circuit and performs charging and energy storage. Among them, when the first output terminal and the second output terminal are stably connected to an external power supply module, the power supply control circuit works normally.

[0024] In some embodiments, the method further includes:

[0025] When the first output terminal and the second output terminal are in an initial power-on state with no output and are just connected to an external power supply module, in response to the voltage signal being greater than the first voltage threshold, the adjustment sub-circuit outputs a low level to the charging sub-circuit, controlling the charging sub-circuit to disconnect from the common terminal resistor;

[0026] The charging sub-circuit receives the low level from the adjustment sub-circuit, disconnects the resistor, and disconnects the first output terminal from the common terminal.

[0027] In a third aspect, the present application provides a power supply, which includes the power supply control circuit as described in the first aspect.

[0028] The beneficial effects of the technical solutions provided in the embodiments of the present application at least include:

[0029] The embodiments of the present application provide a power supply control circuit, a control method, and a power supply. The power supply control circuit with a relatively simple structure protects the power supply module. Compared with the existing methods such as adding an isolation diode or pre-charging at the output terminal of the power supply module, the power supply control circuit provided in the embodiments of the present application realizes power supply control and protection of the power supply module by adjusting the on-off state of the charging sub-circuit, which can reduce power loss, ensure the normal operation of the power supply module, prevent the phenomenon of current backflow during hot plugging of the power supply module, and thus solve the problem of arcing when replacing the power supply control circuit in a non-power-off state. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a first structural schematic diagram of a power supply control circuit provided in an embodiment of the present application;

[0032] Figure 2 It is a second structural schematic diagram of a power supply control circuit provided in an embodiment of the present application;

[0033] Figure 3 It is a method flow chart of a power supply control method provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0035] In a first aspect, a power control circuit provided by an embodiment of the present application is shown in Figure 1 , and the control circuit includes

[0036] a regulation sub-circuit 101, a charging sub-circuit 102, a first power supply VCC, and a common terminal GND;

[0037] The regulation sub-circuit 101 is respectively connected to the first power supply VCC, the common terminal GND, and one end of the charging sub-circuit 102. The regulation sub-circuit 101 is configured to output a low level to the charging sub-circuit 102 in response to a voltage signal being greater than a first voltage threshold when replacing the power control circuit in a non-power-off state, to control the charging sub-circuit 102 to disconnect the resistor from the common terminal GND to prevent current backflow. After the power control circuit operates normally, in response to the voltage signal being less than a second voltage threshold, the regulation sub-circuit 101 outputs a high level to control the charging sub-circuit 102 to be electrically conductive to the common terminal GND;

[0038] The charging sub-circuit 102 is connected to the common terminal GND. The charging sub-circuit 102 includes a first output terminal Vout+ and a second output terminal Vout-. The first output terminal Vout+ and the second output terminal Vout- are connected to an external power module in an openable and closable manner. The first output terminal Vout+ is connected to the detection terminal Dectect of the regulation sub-circuit 101. The charging sub-circuit 102 is configured to receive the low level output by the regulation sub-circuit 101 when replacing the power control circuit in a non-power-off state, to perform resistor disconnection to prevent current backflow. In response to the power control circuit operating normally, the charging sub-circuit 102 receives the high level output by the regulation sub-circuit 101 and performs charging energy storage. Among them, when the first output terminal Vout+ and the second output terminal Vout- are stably connected to the external power module, the power control circuit operates normally.

[0039] The power control circuit provided by the embodiment of the present application can realize power control and protection of the power module by adjusting the on-off state of the charging sub-circuit, which can reduce power loss and ensure the normal operation of the power module.

[0040] It should be noted that when replacing the power control circuit without power interruption, that is, when the power control circuit is incorporated into an external power module without power interruption, the detection terminal Dectect of the adjustment sub-circuit 101 can receive the voltage signal output from the first output terminal Vout+ of the charging sub-circuit 102. When the voltage signal is greater than the first voltage threshold, it indicates that the voltage signal is relatively high. After passing through the adjustment sub-circuit 101, this relatively high voltage signal will output a low level, which does not meet the conduction requirement of the charging sub-circuit 102, thereby controlling the disconnection of the charging sub-circuit 102 from the common terminal GND, effectively preventing current backflow, and thus ensuring that there is no arcing phenomenon when replacing the power control circuit without power interruption for the power module. When the power control circuit is operating normally, that is, when the power control circuit establishes a stable connection with the external power module, the external power module can stably supply power to the power control circuit. The detection terminal Dectect of the adjustment sub-circuit 101 can receive the voltage signal output from the first output terminal Vout+ of the charging sub-circuit 102. When the voltage signal is less than the second voltage threshold, it indicates that the voltage signal is relatively low. After passing through the adjustment sub-circuit 101, this relatively low voltage signal will output a high level, which can meet the conduction requirement of the charging sub-circuit 102, thereby controlling the electrical conduction of the charging sub-circuit 102 with the common terminal GND, so as to ensure that current can flow safely and stably into the charging sub-circuit 102, enabling the charging sub-circuit 102 to charge and store energy, ensuring the normal operation of the power module, and being suitable for power modules with large current output. It can be seen that a power control circuit provided by an embodiment of the present application has a relatively simple structure. Compared with the traditional method of connecting an isolation diode in series at the output terminal to prevent current backflow, the conduction voltage drop of the field-effect transistor MD1 is lower than that of an ordinary diode, which can reduce power loss and ensure the normal operation of the power module. Compared with the pre-charging anti-backflow method, it is simple to operate and has high efficiency, is suitable for power modules with large current output, can prevent the occurrence of current backflow during hot plugging of the power module, and thus solves the problem of arcing when replacing the power control circuit without power interruption.

[0041] In some embodiments, the adjustment sub-circuit 101 is further configured to, when the first output terminal Vout+ and the second output terminal Vout- are in a no-output state of just being connected to the external power module at the initial power-on, in response to the voltage signal being greater than the first voltage threshold, output a low level to the charging sub-circuit 102, control the charging sub-circuit 102 to be disconnected from the common terminal GND, so that the first output terminal Vout+ is disconnected from the common terminal GND;

[0042] The charging sub - circuit 102 is also used to receive the low level of the regulation sub - circuit 101 when the first output terminal Vout+ and the second output terminal Vout - are in the initial - power - on state with no output and just connected to an external power module, perform a resistor break, and disconnect the first output terminal Vout+ from the common terminal GND. With such a setting, when the first output terminal Vout+ and the second output terminal Vout - are in the initial - power - on state with no output and just connected to an external power module, the first output terminal Vout+ can be disconnected from the common terminal GND, which can prevent the first output terminal Vout+ and the common terminal GND from being directly connected to the positive pole of the external power module, thereby reducing the power loss of the power module.

[0043] It should be noted that when the first output terminal Vout+ and the second output terminal Vout - are in the initial - power - on state with no output and just connected to an external power module, it indicates that the external power module may not be able to output current to the power control circuit due to poor contact, damage, or shutdown. In this case, when the voltage signal is greater than the first voltage threshold, a low level is output to the charging sub - circuit 102 to control the charging sub - circuit 102 to perform a resistor break with the common terminal GND, so that the first output terminal Vout+ is disconnected from the common terminal GND, which can prevent the first output terminal Vout+ and the common terminal GND from being directly connected to the positive pole of the external power module.

[0044] In some embodiments, the external power module can be a device or equipment with a power - supply function such as a battery.

[0045] In some embodiments, the output voltage of the external power module can be 10 - 300V.

[0046] In some embodiments, the power control circuit can also be connected to an auxiliary power supply to supply power to the regulation sub - circuit 101.

[0047] In some embodiments, as Figure 2 shown, the regulation sub - circuit 101 includes a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, and an operational amplifier U1A.

[0048] The inverting input terminal of the operational amplifier U1A is connected to the positive pole of the first diode D1, the negative pole of the first diode D1 is connected to the common terminal GND, the non - inverting input terminal of the operational amplifier U1A is connected to the positive pole of the second diode D2, the negative pole of the second diode D2 is connected to the common terminal GND, the positive - power - supply pin of the operational amplifier U1A is connected to the first power supply VCC, and the negative - power - supply pin of the operational amplifier U1A is connected to the common terminal GND. One end of the first resistor R1 is connected to the first node N1, the first node N1 is located between the inverting input terminal of the operational amplifier U1A and the positive pole of the first diode D1, and the other end of the first resistor R1 is connected to the detection terminal Dectect.

[0049] One end of the second resistor R2 is connected to the second node N2, which is located between the non-inverting input terminal of the operational amplifier U1A and the positive electrode of the second diode D2. The other end of the second resistor R2 is connected to the common terminal GND.

[0050] The first resistor R1 is a sampling resistor. As a sampling resistor, the first resistor R1 can apply the voltage between the first output terminal Vout+ and the common terminal GND to the inverting input terminal of the operational amplifier U1A. The second resistor R2 is a grounding resistor, which can make the static voltage of the input terminal to the ground zero. The first diode D1 and the second diode D2 are clamping diodes, which have the forward conduction characteristic, thereby preventing high voltage from being poured into the operational amplifier U1A.

[0051] In some embodiments, the resistance value of the first resistor R1 can be 5.1K to 10K, and the resistance value of the second resistor R2 can be 5.1K to 10K. Such settings can limit the current flowing into the operational amplifier and maintain static balance.

[0052] In some embodiments, the operational amplifier U1A can be an inverting operational amplifier.

[0053] For circuit protection, in some embodiments, as Figure 2 shown, the adjustment sub-circuit 101 further includes a third resistor R3 and a first capacitor C1. One end of the third resistor R3 is connected to the positive power supply pin terminal of the operational amplifier U1A, and the other end of the third resistor R3 is connected to the first power supply VCC. One end of the first capacitor C1 is connected to the third node N3, which is located between one end of the third resistor R3 and the positive power supply pin terminal of the operational amplifier U1A. The other end of the first capacitor C1 is connected to the common terminal GND.

[0054] In some embodiments, the voltage range of the first power supply VCC is 10V to 18V.

[0055] The third resistor R3 is a sampling resistor, and its function is to limit current and filter. The first capacitor C1 is a bypass capacitor, which is used to filter out high-frequency noise.

[0056] In some embodiments, the resistance value of the third resistor R3 can be 5Ω to 100Ω, and the capacitance value of the first capacitor C1 can be 0.001μF to 1μF. Specifically, it can be a 103 capacitor or a 104 capacitor. Such settings can ensure the stable operation of the circuit.

[0057] In some embodiments, the regulator sub - circuit 101 further includes a fourth resistor R4. One end of the fourth resistor R4 is connected to the amplified output terminal of the operational amplifier U1A, and the other end of the fourth resistor R4 is connected to the charging sub - circuit 102. The fourth resistor R4 is a current - limiting resistor, which is used to limit the current flowing through the gate of the field - effect transistor MD1 from the amplified output terminal of the operational amplifier U1A and the magnitude of the damped oscillation, so as to prevent the electronic components from being burned out, thereby protecting the regulator sub - circuit 101 and the charging sub - circuit 102.

[0058] In some embodiments, the resistance value of the fourth resistor R4 can be 10 - 100Ω, so as to make the MD1 switch stable.

[0059] In some embodiments, the charging sub - circuit 102 includes a field - effect transistor MD1. The drain of the field - effect transistor MD1 is connected to the first output terminal Vout+ through the fourth node N4. The detection node N0 is connected to the fourth node N4. The source of the field - effect transistor MD1 is connected to the common terminal GND, and the gate of the field - effect transistor MD1 is connected to the other end of the fourth resistor R4.

[0060] Through the cooperation of the operational amplifier U1A and the field - effect transistor MD1, when replacing the power - supply control circuit in the non - power - off state, due to the existence of the common terminal GND in the regulator sub - circuit 101, the voltage signal is higher than the common terminal GND, which is equivalent to outputting a high level to the regulator sub - circuit 101. The regulator sub - circuit 101 converts the high level into a low level, so that the charging sub - circuit 102 is turned off, thereby preventing the current output from the first output terminal Vout+ from flowing back into the second capacitor C2; when the power - supply control circuit is working normally, due to the existence of the common terminal GND and the first output terminal Vout+ of the charging sub - circuit 102 in the charging sub - circuit 102, the voltage signal is lower than the common terminal GND, which is equivalent to outputting a low level to the regulator sub - circuit 101. The regulator sub - circuit 101 converts the low level into a high level, so that the charging sub - circuit 102 is electrically conductive.

[0061] Compared with the traditional method of connecting an isolation diode in series at the output terminal to prevent current back - flow, the conduction voltage drop of the set operational amplifier U1A is less than that of an ordinary diode, thereby reducing the loss.

[0062] In some embodiments, as Figure 2 shown, the field - effect transistor MD1 can be an N - channel enhancement - mode field - effect transistor with low on - resistance and low on - loss. When the field - effect transistor MD1 is an N - channel enhancement - mode field - effect transistor, in the case of the amplified output terminal of the operational amplifier U1A outputting a high level, since a high level is input to the gate of the field - effect transistor MD1, and the source of the field - effect transistor MD1 is connected to the common terminal GND, the field - effect transistor MD1 is turned on, so as to realize the electrical conduction of the charging sub - circuit 102.

[0063] In some embodiments, the charging sub - circuit 102 further includes a second capacitor C2. One end of the second capacitor C2 is connected to the common terminal GND, and the other end of the second capacitor C2 is connected to the second output terminal Vout-.

[0064] In some embodiments, the second capacitor C2 is an electrolytic capacitor. One end of the second capacitor C2 is the positive electrode, and the other end of the second capacitor C2 is the negative electrode. The function of the second capacitor C2 is to filter the module output.

[0065] In some embodiments, the second capacitor C2 may specifically be an aluminum electrolytic capacitor, and the capacitance value may be from 100 μF to 10,000 μF.

[0066] In summary, a power control circuit provided by an embodiment of the present application protects the power module through a power control circuit with a relatively simple structure. Compared with the existing methods such as adding an isolation diode or pre - charging at the output end of the power module, the power control circuit provided by the embodiment of the present application can realize power control and protection of the power module by adjusting the on - off state of the charging sub - circuit, can reduce power loss, ensure the normal operation of the power module, and can prevent the phenomenon of current backflow during hot - plugging of the power module, thereby solving the problem of arcing when replacing the power control circuit in a non - power - off state.

[0067] In a second aspect, an embodiment of the present application provides a power control method, which is applied to the power control circuit as described in the first aspect. Refer to Figure 3 , and the method includes:

[0068] Step 301, when replacing the power control circuit in a non - power - off state, in response to the voltage signal being greater than the first voltage threshold, the regulating sub - circuit 101 outputs a low level to the charging sub - circuit 102, controls the charging sub - circuit 102 to be disconnected from the common terminal GND to prevent current backflow. After the power control circuit works normally, in response to the voltage signal being less than the second voltage threshold, the regulating sub - circuit 101 outputs a high level to the charging sub - circuit 102, controls the charging sub - circuit 102 to be electrically connected to the common terminal GND.

[0069] Step 302, when replacing the power control circuit without power-off, the charging sub-circuit 102 receives the low level output by the regulation sub-circuit 101, performs a resistance break to prevent current backflow, and in response to the charging sub-circuit 102 receiving the high level output by the regulation sub-circuit 101 after the power control circuit works normally, performs charging and energy storage. Wherein, when the first output terminal Vout+ and the second output terminal Vout- are stably connected to an external power module, the power control circuit works normally. In some embodiments, the method may further include: when the first output terminal Vout+ and the second output terminal Vout- are in an initial power-on state without output just connected to the external power module, in response to the voltage signal being greater than the first voltage threshold, the regulation sub-circuit 101 outputs a low level to the charging sub-circuit 102 to control the charging sub-circuit 102 to break the resistance with the common terminal GND; the charging sub-circuit 102 receives the low level of the regulation sub-circuit 101, performs a resistance break and disconnects the first output terminal Vout+ from the common terminal GND, thereby reducing the power loss of the power module.

[0070] In summary, a power control method provided by an embodiment of the present application is simple to operate. It can achieve power control and protection of the power module by adjusting the on-off state of the charging sub-circuit, can reduce power loss, ensure the normal operation of the power module, can prevent the phenomenon of current backflow during hot plugging of the power module, and thus solve the problem of arcing when replacing the power control circuit without power-off.

[0071] In a third aspect, an embodiment of the present application provides a power supply, which includes the power control circuit as in the first aspect.

[0072] In summary, a power supply provided by an embodiment of the present application has a simple structure. It can achieve power control and protection of the power module by adjusting the on-off state of the charging sub-circuit, can reduce power loss, ensure the normal operation of the power module, can prevent the phenomenon of current backflow during hot plugging of the power module, and thus solve the problem of arcing when replacing the power control circuit without power-off.

[0073] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0074] After considering the specification and practicing the present application disclosed herein, those skilled in the art will readily think of other implementation manners of the present application. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary.

[0075] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A power control circuit, characterized in that: The control circuit comprises a regulating subcircuit (101), a charging subcircuit (102), a first power source (VCC) and a common terminal (GND); The regulating subcircuit (101) is respectively connected to a first power supply (VCC) and a common terminal (GND) and one end of the charging subcircuit (102); the regulating subcircuit (101) comprises a detection terminal (Dectect) for obtaining a voltage signal of a first output terminal (Vout+) in the charging subcircuit (102); the regulating subcircuit (101) is used for, when the power control circuit is replaced in an uninterrupted power state, in response to a voltage signal being greater than a first voltage threshold, outputting a low level to the charging subcircuit (102) to control the charging subcircuit (102) to be electrically disconnected from the common terminal (GND); after the power control circuit works normally, in response to a voltage signal being less than a second voltage threshold, outputting a high level to the charging subcircuit (102) to control the charging subcircuit (102) to be electrically connected to the common terminal (GND); The charging subcircuit (102) is connected to a common terminal (GND), and comprises a first output terminal (Vout+) and a second output terminal (Vout-), wherein the first output terminal (Vout+) and the second output terminal (Vout-) are connected to an external power module in an openable and closable manner, and the first output terminal (Vout+) is connected to a detection terminal (Dectect) of the regulating subcircuit (101). The charging subcircuit (102) is used to receive a low level output by the regulating subcircuit (101) when replacing the power control circuit in an uninterrupted power state, and to perform resistance disconnection to prevent current backflow, and in response to receiving a high level output by the regulating subcircuit (101) after the power control circuit operates normally, to perform charging and energy storage, wherein when the first output terminal (Vout+) and the second output terminal (Vout-) are stably connected to the external power module, the power control circuit operates normally.

2. The control circuit according to claim 1, characterized in that: The regulating subcircuit (101) is also used for outputting a low level to the charging subcircuit (102) in response to the voltage signal being greater than a first voltage threshold when the first output terminal (Vout+) and the second output terminal (Vout-) are in a non-output state at the beginning of power-on just after being connected to an external power supply module, and controlling the charging subcircuit (102) to be disconnected from the common terminal (GND) so that the first output terminal (Vout+) and the common terminal (GND) are disconnected; The charging subcircuit (102) is also used to receive the low level of the regulating subcircuit (101) when the first output terminal (Vout+) and the second output terminal (Vout-) are in a no-output state in an initial power-on state just connected to an external power supply module, and to perform resistance cutting and disconnect the first output terminal (Vout+) and the common terminal (GND).

3. The control circuit according to claim 1, characterized in that: The regulating subcircuit (101) comprises a first diode (D1), a second diode (D2), a first resistor (R1), a second resistor (R2) and an operational amplifier (U1A); The inverting input terminal of the operational amplifier (U1A) is connected to the anode of the first diode (D1), the cathode of the first diode (D1) is connected to the common terminal (GND), the non-inverting input terminal of the operational amplifier (U1A) is connected to the anode of the second diode (D2), the cathode of the second diode (D2) is connected to the common terminal (GND), the positive power supply pin of the operational amplifier (U1A) is connected to the first power supply (VCC), and the negative power supply pin of the operational amplifier (U1A) is connected to the common terminal (GND); One end of the first resistor (R1) is connected to a first node (N1), the first node (N1) is located between the inverting input terminal of the operational amplifier (U1A) and the anode of the first diode (D1), and the other end of the first resistor (R1) is connected to the detection terminal (Dectect); One end of the second resistor (R2) is connected to a second node (N2), the second node (N2) is located between the non-inverting input terminal of the operational amplifier (U1A) and the anode of the second diode (D2), and the other end of the second resistor (R2) is connected to the common terminal (GND).

4. The control circuit according to claim 3, characterized in that: The regulating subcircuit (101) further comprises a third resistor (R3), a first capacitor (C1) and a fourth resistor (R4), one end of the third resistor (R3) is connected to the positive power supply pin of the operational amplifier (U1A), the other end of the third resistor (R3) is connected to the first power supply (VCC), one end of the first capacitor (C1) is connected to a third node (N3), the third node (N3) is located between one end of the third resistor (R3) and the positive power supply pin of the operational amplifier (U1A), the other end of the first capacitor (C1) is connected to the common terminal (GND), one end of the fourth resistor (R4) is connected to the amplification output terminal of the operational amplifier (U1A), and the other end of the fourth resistor (R4) is connected to the charging subcircuit (102).

5. The control circuit according to claim 3, characterized in that: The charging subcircuit (102) comprises a field effect transistor (MD1), the drain of the field effect transistor (MD1) is connected to the first output terminal (Vout+) via a fourth node (N4), the detection node (N0) is connected to the fourth node (N4), the source of the field effect transistor (MD1) is connected to the common terminal (GND), and the gate of the field effect transistor (MD1) is connected to the other end of the fourth resistor (R4).

6. The control circuit according to claim 3, characterized in that: The charging subcircuit (102) further comprises a second capacitor (C2), one end of the second capacitor (C2) is connected to the common end (GND), and the other end of the second capacitor (C2) is connected to the second output end (Vout-).

7. The control circuit according to claim 6, characterized in that: The second capacitor (C2) is an electrolytic capacitor, one end of the second capacitor (C2) is a positive electrode, and the other end of the second capacitor (C2) is a negative electrode.

8. A power supply control method, characterized in that: Applied to the power supply control circuit according to any one of claims 1 to 7, the method comprises: When the power control circuit is replaced without power failure, in response to the voltage signal being greater than a first voltage threshold, the regulating subcircuit (101) outputs a low level to the charging subcircuit (102), controls the charging subcircuit (102) to be electrically disconnected from the common terminal (GND), so as to prevent current from flowing back into the charging subcircuit (102); after the power control circuit works normally, in response to the voltage signal being less than a second voltage threshold, the regulating subcircuit (101) outputs a high level to the charging subcircuit (102), controls the charging subcircuit (102) to be electrically connected to the common terminal (GND); When the power control circuit is replaced without power failure, the charging subcircuit (102) receives the low level output by the regulating subcircuit (101) and performs resistance disconnection to prevent current backflow. In response to the normal operation of the power control circuit, the charging subcircuit (102) receives the high level output by the regulating subcircuit (101) and performs charging and energy storage. When the first output terminal (Vout+) and the second output terminal (Vout-) are stably connected to an external power module, the power control circuit operates normally.

9. The power control method according to claim 8, characterized in that: The method further comprises: When the first output terminal (Vout+) and the second output terminal (Vout-) are in a non-output state at the beginning of power-on just after being connected to an external power supply module, in response to the voltage signal being greater than a first voltage threshold, the regulating subcircuit (101) outputs a low level to the charging subcircuit (102), and controls the charging subcircuit (102) to be disconnected from the common terminal (GND); The charging subcircuit (102) receives the low level of the regulating subcircuit (101), performs resistance cutting, and disconnects the first output terminal (Vout+) and the common terminal (GND).

10. A power supply, characterized in that: The power supply comprises a power supply control circuit as described in any one of claims 1-7.

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