Enabling control circuit, power supply system and enabling control method using pulse signal

Abstract

The embodiments of the present invention relate to the field of enabling control technology, and in particular to an enabling control circuit, a power supply system and an enabling control method using a pulse signal. The circuit includes: an opening control module, a closing control module and a control implementation and locking function circuit module; the opening control module enables the enabling end of the control implementation and locking function circuit module to output a high level based on a first pulse signal to turn on the power supply; the closing control module is used to enable the enabling end of the control implementation and locking function circuit module to output a low level based on a second pulse signal to turn off the power supply; the control implementation and locking function circuit module is also used to lock the enabling state before the other module changes the enabling end state after one module in the opening control module or the closing control module performs enabling end control. This scheme controls the enabling switch through a pulse signal, and the two signals of opening and closing are controlled separately. It is not only simple to control, but also has strong anti-interference ability, is not easy to cause accidental opening, and is safer and more reliable.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of enabling control technology, and in particular to an enabling control circuit, a power supply system and an enabling control method using a pulse signal. Background Art

[0002] With the rapid development of society and science and technology, power supplies are widely used in various industries and various electronic devices. Power supplies need to realize their specific functions in different situations, and power supply control has become an important part of power supply use. Most of the existing control circuits are powered by the voltage regulator inside the power chip, and a single signal is input to the enable end through a voltage divider resistor or sensor to control the opening and closing of the power supply. When the control signal is high, the enable voltage is low and the power is turned off; when the control signal is low, the enable voltage is high and the power is turned on. This traditional enable control power supply is turned on and off by the high and low levels of the same signal control. The single signal control has poor anti-interference and is easy to be turned on by mistake, causing safety hazards.

[0003] Therefore, a new enabling control circuit is urgently needed. Summary of the invention

[0004] In order to solve the problem that the turning on and off of the traditional enabling control power supply is controlled by a signal control, the single signal control has poor anti-interference performance and is easy to be turned on by mistake and cause safety hazards, the embodiments of the present invention provide an enabling control circuit, a power supply system and an enabling control method using a pulse signal.

[0005] In a first aspect, an embodiment of the present invention provides an enabling control circuit using a pulse signal, comprising: an opening control module, a closing control module, and a control implementation and locking function circuit module;

[0006] The opening control module and the closing control module are respectively connected to an external isolated power supply, and the output ends are respectively connected to the control implementation and locking function circuit modules, and the input ends of the opening control module and the closing control module are respectively connected to the first pulse signal and the second pulse signal;

[0007] The on control module is used to make the enable end of the control implementation and locking function circuit module output a high level based on the first pulse signal to turn on the power supply; the off control module is used to make the enable end of the control implementation and locking function circuit module output a low level based on the second pulse signal to turn off the power supply;

[0008] The control implementation and locking function circuit module is used to perform high and low level output control of the enable end based on the pulse signals of the open control module and the close control module, and after one module of the open control module or the close control module performs the enable end control, the enable state is locked before the other module changes the enable end state.

[0009] In a second aspect, an embodiment of the present invention further provides a power supply system, comprising: a power supply module and an enabling control circuit as described in any embodiment of this specification;

[0010] The power module is connected to the enable terminal of the enable control circuit and is used to turn on and off the power supply based on the high and low levels of the enable terminal.

[0011] In a third aspect, an embodiment of the present invention further provides an enabling control method based on the enabling control circuit described in any embodiment of this specification, the method comprising:

[0012] The start control module enables the enable terminal of the control implementation and locking function circuit module to output a high level based on the first pulse signal;

[0013] The control implementation and locking function circuit module enters a locked state, so that the enable terminal outputs a locked high level state;

[0014] When the shutdown control module receives the second pulse signal, the enable end of the control implementation and locking function circuit module is switched to a low level and enters a locked state until the startup control module receives the first pulse signal, so that the enable end can be switched to a high level again.

[0015] The embodiment of the present invention provides an enable control circuit, a power supply system and an enable control method using a pulse signal, wherein the enable control is performed by a pulse signal, and the enable opening and shutting down are respectively controlled by different signals, that is, the first pulse signal input by the enable control module and the second pulse signal input by the shutting down control module jointly control the enable, thereby controlling the power switch. In this solution, the enable switch is controlled by a pulse signal, and the two signals of the on and off are controlled separately, which is not only simple to control, but also has strong anti-interference ability, is not easy to cause accidental opening, and is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1An enabling control circuit diagram using a pulse signal is provided in one embodiment of the present invention;

[0018] Figure 2 It is a traditional enabling control circuit diagram;

[0019] Figure 3 It is a simulation waveform diagram of the traditional control circuit;

[0020] Figure 4 is a diagram of simulation results of an enable control circuit using a pulse signal provided by an embodiment of the present invention;

[0021] Figure 5 It is a simulation waveform diagram provided by an embodiment of the present invention;

[0022] Figure 6 is another simulation waveform diagram provided by an embodiment of the present invention;

[0023] Figure 7 It is another simulation waveform diagram provided by an embodiment of the present invention;

[0024] Figure 8 The present invention provides a flowchart of an enabling control method using a pulse signal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] As mentioned above, the conventional enable control circuit is Figure 2 As shown in the figure, the simulation waveform of this traditional enabling control circuit is as follows Figure 3 As shown, it can be seen that when the control signal is at a high level, the enable voltage is at a low level, and the power is turned off; when the control signal is at a low level, the enable voltage is at a high level, and the power is turned on. The turning on and off of the power supply is controlled by a signal, and the control signal is not isolated, that is, there is no electrical isolation between the control signal and the controlled object. This traditional enable control circuit cannot cope with the situation where the control signal is a pulse signal. Therefore, the inventor considers enabling control through a pulse signal, and enabling turning on and off is jointly controlled by the first pulse signal input by the opening control module and the second pulse signal of the closing control module. By controlling the enable switch by a pulse signal, the two signals of opening and closing are controlled separately, which is not only simple to control, but also has strong anti-interference ability, is not easy to cause accidental opening, and can be safer and more reliable.

[0027] The specific implementation of the above concept is described below.

[0028] Please refer to Figure 1 , an embodiment of the present invention provides an enabling control circuit using a pulse signal, the circuit comprising: an opening control module, a closing control module and a control implementation and locking function circuit module;

[0029] The opening control module and the closing control module are respectively connected to the external isolated power supply, the output ends are respectively connected to the control implementation and locking function circuit modules, and the input ends of the opening control module and the closing control module are respectively connected to the first pulse signal and the second pulse signal;

[0030] The on control module is used to make the enable end of the control implementation and locking function circuit module output a high level based on the first pulse signal to turn on the power supply; the off control module is used to make the enable end of the control implementation and locking function circuit module output a low level based on the second pulse signal to turn off the power supply;

[0031] The control implementation and locking function circuit module is used to control the high and low level output of the enable end based on the pulse signals of the open control module and the close control module, and to lock the enable state before the other module changes the enable end state after one module in the open control module or the close control module controls the enable end.

[0032] In the embodiment of the present invention, the enable control is performed by a pulse signal, and the enable opening and closing are controlled by different signals respectively, that is, the first pulse signal input by the opening control module and the second pulse signal of the closing control module jointly control the enable, and then control the power switch. In this scheme, the enable switch is controlled by a pulse signal, and the two signals of opening and closing are controlled separately, which is not only simple to control, but also has strong anti-interference ability, is not easy to cause accidental opening, and is safer and more reliable.

[0033] According to the following Figure 1 The circuit diagram shown is explained.

[0034] In some embodiments, reference may be made to Figure 1 The control implementation and locking function circuit module is used to enable the enable end to output a high level based on the first pulse signal of the open control module and enter the locked state. The enable end can be pulled low and enter the locked state only after the closed control module receives the second pulse signal; the enable end can be pulled high again and enter the locked state only after the open control module receives the first pulse signal.

[0035] It can be understood that the first pulse signal is only used to control the power on, and the second pulse signal is only used to control the power off, and after one of the pulse signals enables the device to be in a certain state, before the other pulse signal changes the enable state, the control implementation and locking function circuit modules will lock the enable end in this state.

[0036] In some embodiments, there is electrical isolation between the control signal of the opening control module and / or the closing control module and the control implementation and locking function circuit module.

[0037] In such Figure 2 In the conventional enabling control circuit shown, the control signal is not isolated, that is, the control signal and the controlled object are not electrically isolated, which results in certain electrical interference, affecting the safety and reliability of the enabling control circuit. Therefore, electrical isolation can be set in the opening control module and / or the closing control module to further improve the anti-interference ability of the enabling control circuit.

[0038] In some embodiments, a relay is used in the opening control module and / or the closing control module to achieve electrical isolation between the control signal and the control implementation and locking function circuit modules.

[0039] In this embodiment, a relay can be set in the opening control module and / or the closing control module to realize electrical isolation between the control signal and the control realization and locking function circuit modules. However, since the relay is large in size, it will greatly increase the PCB layout area and cost.

[0040] Therefore, in some embodiments, an optocoupler light emitting diode is used in the opening control module and / or the closing control module to achieve electrical isolation between the control signal and the control implementation and locking function circuit modules.

[0041] like Figure 1 As shown, in the opening control module and the closing control module, the control signal is isolated from the control circuit through the optical coupler light emitting diode. Compared with the relay, the circuit can be simplified and the PCB layout area and cost can be reduced.

[0042] You can refer to Figure 1 , in some embodiments, the start-up control module includes: an optocoupler U1 and a current-limiting resistor R1;

[0043] The anode of the primary side of the optical coupler U1 is connected to the external isolated power supply via the current limiting resistor R1, and the cathode of the primary side is grounded via the first pulse signal transmitting end;

[0044] Both ends of the secondary side of the optocoupler U1 are connected to the control implementation and locking function circuit module.

[0045] In this embodiment, S+ / S- is connected to the first pulse signal for turning on the power supply, and OC+ is connected to the external isolated power supply. ON+ / ON- is a position identifier in the circuit, which is convenient for the subsequent description of the circuit function. The primary and secondary sides of the optocoupler are isolated and have an isolation effect.

[0046] You can refer to Figure 1 , in some embodiments, the shutdown control module includes: an optocoupler U2 and a current limiting resistor R14;

[0047] The anode of the primary side of the optocoupler U2 is connected to the external isolated power supply via the current limiting resistor R14, and the cathode of the primary side is grounded via the second pulse signal transmitting end;

[0048] Two ends of the secondary side of the optocoupler U2 are connected to the control implementation and locking function circuit module, and one end is grounded.

[0049] In this embodiment, V+ / V- is connected to the second pulse signal for turning off the power supply. OFF+ / OFF- is also a position identifier in the circuit, which facilitates the subsequent description of the circuit function.

[0050] You can refer to Figure 1 In some embodiments, the control implementation and locking function circuit module includes: a current limiting resistor R2, a current limiting resistor R3, a diode D1, a capacitor C1, a resistor R4, a resistor R5, a PNP transistor Q1, a diode D2, a resistor R6, a capacitor C2, a resistor R7, an NPN transistor Q2, a resistor R8, a resistor R9, a capacitor C3, a resistor R10, a diode D3, a diode D4, a resistor R11, a capacitor C4, a resistor R12, an NPN transistor Q3, and a resistor R13;

[0051] The opening control module is connected between the current limiting resistor R2 and the current limiting resistor R3, the current limiting resistor R3 is connected in parallel with the diode D1 and the capacitor C1, the capacitor C1 is connected in parallel with the resistor R4, both ends of the capacitor C1 are connected to the closing control module, and the capacitor C1 and the resistor R4 are grounded;

[0052] The emitter of the PNP transistor Q1 is connected to the power supply end, the collector is connected to the resistor R5, the base is connected to the connection line of the resistor R8 and the resistor R9, the resistor R8 is connected in parallel with the capacitor C3, and the resistor R8 and the capacitor C3 are both connected to the power supply end, the other end of the resistor R5 is connected to the anode of the resistor R4 and the diode D2 respectively, the cathode of the diode D2 is connected to the resistor R6, and the other end of the resistor R6 is connected to the parallel line of the capacitor C2 and the resistor R7;

[0053] The emitter of the NPN transistor Q2 is grounded, the collector is connected to the connection line between the cathode of the diode D3 and the resistor R9, and the base is connected to the parallel connection line between the capacitor C2 and the resistor R7;

[0054] The anode of the diode D3 is connected to the anodes of the resistor R10 and the diode D4 respectively, the other end of the resistor R10 is connected to the power supply end, the cathode of the diode D4 is connected to the resistor R11, the other end of the resistor R11 is connected to the capacitor C4, the capacitor C4 and the resistor R12 are connected in parallel, the capacitor C4 and the resistor R12 are grounded, the resistor R12 is connected to the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, the collector is connected to the enable end and the resistor R13 respectively, and the other end of the resistor R13 is connected to the power supply end.

[0055] In this embodiment, before the power is turned on, V+ / V- is connected to a high level or in a high impedance state, the primary side of the optocoupler U2 is turned off, and there is high impedance between OFF+ and OFF-. At this time, the first pulse signal can be input through S+ / S- to control the start.

[0056] Next, the principle of turning on the power of the control module is described.

[0057] When the first pulse signal is input to the S+ / S- terminal, when the first pulse signal enters the first low pulse, the primary side of the optocoupler U1 is turned on, and the secondary side is also turned on, ON- becomes a high level, OFF+ becomes a high level, the base potential of the transistor Q2 rises, Q2 is turned on (Q2 is an NPN transistor, and the conduction condition is that the base voltage is greater than the emitter voltage), the collector potential of Q2 becomes 0V, D4 is cut off, and the base voltage of the NPN transistor Q3 becomes a low level, Q3 is cut off, and the enable terminal EN potential is provided by VIN+ and becomes a high level, and the power is turned on. At this time, since the collector potential of transistor Q2 is 0V, the potential of the base of PNP transistor Q1 is divided by resistors R8 and R9 and is lower than VIN+, PNP transistor Q1 is turned on (Q1 is a PNP transistor, and the conduction condition is that the base voltage is less than the emitter voltage), and the potential of OFF+ is maintained at a high level by VIN+ through the voltage division of resistors R4 and R5. Therefore, Q1 will remain on, and the circuit enters a locked state. Then the low pulse signal state of S+ / S- is restored to a high level, the optocoupler U1 is disconnected, and the ON- potential becomes a low level. The ON- state will no longer affect the enable potential, and the power supply remains on. Only by inputting the second pulse signal V+ / V- to the shutdown control module, the enable end can be pulled down when the second pulse signal enters the first low pulse to turn off the power supply, thereby realizing the function of controlling the power supply to be turned on by a pulse signal.

[0058] Next, the principle of shutting down the control module and shutting down the power supply is described.

[0059] The second pulse signal is input to the V+ / V- terminal. When the second pulse signal enters the first low pulse, the primary side of the optocoupler U2 is turned on, so that the secondary side is turned on, OFF+ is grounded, the base voltage of the transistor Q2 becomes low level, the transistor Q2 is turned off, and the collector of the transistor Q2 is restored to high impedance. Therefore, the base potential of the transistor Q1 is restored to be equal to the potential of VIN+, Q1 is turned off, VIN+ will no longer increase the potential of OFF+ through the conduction of Q1, the anodes of the diodes D3 and D4 become high level, the voltage of the base of Q3 increases, Q3 remains on, the enable terminal EN is grounded, and the power supply is turned off. Since the state of Q3 is locked (remains on) at this time, the power supply is also locked to the off state, and then the low pulse signal of V+ / V- is restored to a high level, the optocoupler is turned off, and the impedance between OFF+ and OFF- is restored. At this time, the power supply can be turned on by inputting the first pulse signal S+ / S- to the start control module, so as to realize the function of controlling the power supply to be turned off by the pulse signal.

[0060] In order to verify the solution of this embodiment, a circuit was built on LTspice for simulation. The simulation results are as follows: Figure 4 shown.

[0061] If the voltage regulator input VIN+ inside the power chip is 5V, S+ / S- is a pulse on signal, and V+ / V- is a pulse off signal. When S+ / S- inputs the first pulse signal, the enable terminal EN potential is pulled high, the power supply starts and remains on, and only when V+ / V- inputs the second pulse signal, the enable terminal EN is pulled low and the power supply is turned off.

[0062] A 100V input power supply module is now used to perform a functional test on the pulse enable control circuit. The power supply module uses the enable control circuit using the pulse signal proposed in this embodiment. The test results are as follows: Figure 5 , Figure 6 and Figure 7 shown.

[0063] exist Figure 5 In the example, when the first pulse signal is input, the enable is pulled high and the power is turned on. When the second pulse signal is input, the enable is pulled low and the power is turned off. The actual circuit waveform is consistent with the simulation result.

[0064] like Figure 6 and Figure 7 As shown, the ON- potential and the OFF+ potential rise with the input of the first pulse signal S+ / S-. After the first pulse signal ends, the ON- potential returns to a low level, while the OFF+ potential remains at a high level. The enable terminal EN remains at a high level during this period, and the power supply also remains on until the second pulse signal V+ / V- is input, the enable terminal EN is pulled low, the power supply is turned off, and the test waveform is consistent with the circuit simulation waveform.

[0065] After simulation and actual circuit testing, it is verified that the enable control circuit using pulse signals proposed in this scheme has the functions of controlling the enable end of the power chip by inputting pulse signals, and controlling the opening and closing signals separately.

[0066] This embodiment also provides a power supply system, including: a power supply module and an enable control circuit as in any embodiment in the specification; the power supply module is connected to the enable end of the enable control circuit, and is used to turn on and off the power supply based on the high and low levels of the enable end.

[0067] It should be noted that the above power supply system embodiment and the enabling control circuit embodiment belong to the same concept, and the specific implementation process is detailed in the enabling control circuit embodiment, which will not be repeated here.

[0068] like Figure 8 As shown, this embodiment also provides an enabling control method of an enabling control circuit based on this specification, the method comprising:

[0069] Step 800, the control module is turned on to enable the enable terminal of the control implementation and locking function circuit module to output a high level based on the first pulse signal;

[0070] Step 802, controlling the implementation and locking function circuit module to enter a locked state, so that the enable terminal outputs a locked high level state;

[0071] Step 804, when the closing control module receives the second pulse signal, the enable end of the control implementation and locking function circuit module is switched to a low level and enters a locked state until the opening control module receives the first pulse signal, so that the enable end can be switched to a high level again.

[0072] It should be noted that the above method embodiment and the enabling control circuit embodiment belong to the same concept, and the specific implementation process is detailed in the enabling control circuit embodiment, which will not be repeated here.

[0073] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical factors in the process, method, article or device including the elements.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An enabling control circuit using a pulse signal, characterized in that: include: Open control module, close control module and control implementation and locking function circuit module; The opening control module and the closing control module are respectively connected to an external isolated power supply, and the output ends are respectively connected to the control implementation and locking function circuit modules, and the input ends of the opening control module and the closing control module are respectively connected to the first pulse signal and the second pulse signal; The on control module is used to make the enable end of the control implementation and locking function circuit module output a high level based on the first pulse signal to turn on the power supply; the off control module is used to make the enable end of the control implementation and locking function circuit module output a low level based on the second pulse signal to turn off the power supply; The control implementation and locking function circuit module is used to perform high and low level output control of the enable end based on the pulse signals of the open control module and the close control module, and after one module of the open control module or the close control module performs the enable end control, the enable state is locked before the other module changes the enable end state.

2. The enabling control circuit according to claim 1, characterized in that: The control implementation and locking function circuit module is used to make the enable end output a high level based on the first pulse signal of the opening control module and then enter a locking state. The enable end can be pulled down and enter a locking state only after the closing control module receives the second pulse signal; the enable end can be pulled up again and enter a locking state only after the opening control module receives the first pulse signal.

3. The enabling control circuit according to claim 1, characterized in that: The control signal of the opening control module and / or the closing control module is electrically isolated from the control implementation and locking function circuit module.

4. The enabling control circuit according to claim 3, characterized in that: The opening control module and / or the closing control module utilizes a relay to achieve electrical isolation between the control signal and the control implementation and locking function circuit modules.

5. The enabling control circuit according to claim 3, characterized in that: The opening control module and / or the closing control module utilizes an optical coupler light emitting diode to achieve electrical isolation between the control signal and the control implementation and locking function circuit modules.

6. The enabling control circuit according to claim 5, characterized in that: The start-up control module includes: an optical coupler U1 and a current limiting resistor R1; The anode of the primary side of the optical coupler U1 is connected to the external isolated power supply via the current limiting resistor R1, and the cathode of the primary side is grounded via the first pulse signal transmitting end; Both ends of the secondary side of the optocoupler U1 are connected to the control implementation and locking function circuit module.

7. The enabling control circuit according to claim 5, characterized in that: The shutdown control module includes: an optocoupler U2 and a current limiting resistor R14; The anode of the primary side of the optocoupler U2 is connected to the external isolated power supply via the current limiting resistor R14, and the cathode of the primary side is grounded via the second pulse signal transmitting end; Two ends of the secondary side of the optocoupler U2 are connected to the control implementation and locking function circuit module, and one end is grounded.

8. The enabling control circuit according to claim 1, characterized in that: The control implementation and locking function circuit module includes: a current limiting resistor R2, a current limiting resistor R3, a diode D1, a capacitor C1, a resistor R4, a resistor R5, a PNP transistor Q1, a diode D2, a resistor R6, a capacitor C2, a resistor R7, an NPN transistor Q2, a resistor R8, a resistor R9, a capacitor C3, a resistor R10, a diode D3, a diode D4, a resistor R11, a capacitor C4, a resistor R12, an NPN transistor Q3 and a resistor R13; The opening control module is connected between the current limiting resistor R2 and the current limiting resistor R3, the current limiting resistor R3 is connected in parallel with the diode D1 and the capacitor C1, the capacitor C1 is connected in parallel with the resistor R4, both ends of the capacitor C1 are connected to the closing control module, and the capacitor C1 and the resistor R4 are grounded; The emitter of the PNP transistor Q1 is connected to the power supply end, the collector is connected to the resistor R5, the base is connected to the connection line of the resistor R8 and the resistor R9, the resistor R8 is connected in parallel with the capacitor C3, and the resistor R8 and the capacitor C3 are both connected to the power supply end, the other end of the resistor R5 is connected to the anode of the resistor R4 and the diode D2 respectively, the cathode of the diode D2 is connected to the resistor R6, and the other end of the resistor R6 is connected to the parallel line of the capacitor C2 and the resistor R7; The emitter of the NPN transistor Q2 is grounded, the collector is connected to the connection line between the cathode of the diode D3 and the resistor R9, and the base is connected to the parallel connection line between the capacitor C2 and the resistor R7; The anode of the diode D3 is connected to the anodes of the resistor R10 and the diode D4 respectively, the other end of the resistor R10 is connected to the power supply end, the cathode of the diode D4 is connected to the resistor R11, the other end of the resistor R11 is connected to the capacitor C4, the capacitor C4 and the resistor R12 are connected in parallel, the capacitor C4 and the resistor R12 are grounded, the resistor R12 is connected to the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, the collector is connected to the enable end and the resistor R13 respectively, and the other end of the resistor R13 is connected to the power supply end.

9. A power supply system, characterized in that: include: A power supply module and an enabling control circuit as claimed in any one of claims 1 to 8; The power module is connected to the enable terminal of the enable control circuit and is used to turn on and off the power supply based on the high and low levels of the enable terminal.

10. An enabling control method based on the enabling control circuit according to any one of claims 1 to 8, characterized in that the method include: The start control module enables the enable terminal of the control implementation and locking function circuit module to output a high level based on the first pulse signal; The control implementation and locking function circuit module enters a locked state, so that the enable terminal outputs a locked high level state; When the shutdown control module receives the second pulse signal, the enable end of the control implementation and locking function circuit module is switched to a low level and enters a locked state until the startup control module receives the first pulse signal, so that the enable end can be switched to a high level again.

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