Power supply control circuit and control method thereof, controller and electric equipment

Abstract

The invention discloses a power supply control circuit and a control method thereof, a controller and electric equipment, the power supply control circuit comprises a first switching device, a self-locking circuit and a charging trigger circuit, the self-locking circuit comprises a conduction control end and a self-locking switch, the charging trigger circuit comprises a charging circuit and a trigger switch, the self-locking switch and the trigger switch are connected in parallel, and the self-locking switch and the trigger switch are connected in parallel. The conduction control end is used for triggering the self-locking switch to keep a conduction state through a pulse signal so as to enable the first switching device to be controlled to be conducted, the charging circuit is used for charging through the pulse signal and conducting the trigger switch under the condition that the self-charging voltage exceeds a preset voltage threshold value, and the trigger switch is used for bypassing the self-locking switch in the conduction state so as to enable the first switching device to be controlled to be conducted. The self-locking switch enters a turn-off state after the pulse signal is stopped; according to the embodiment of the invention, connection and disconnection of the power supply are controlled by using the length of the pulse signal, and circuit cost and control cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic circuits, and in particular to a power supply control circuit and a control method thereof, a controller, and an electrical device. Background Art

[0002] The use of optocouplers can isolate the control end and the load end in the circuit. The controller turns on the optocoupler through the control signal, so that the power supply is applied to both ends of the load, thereby realizing the power supply connection control. When the load is in use, the controller needs to energize the optocoupler for a long time to keep the optocoupler in the on state. Therefore, when the load is running for a long time, the optocoupler is also turned on for a long time, continuously consuming electricity, which is not conducive to the energy saving needs of electrical equipment.

[0003] Under the existing technology, the power supply can be triggered and kept connected to the load through a self-locking circuit or the like. However, when the connection between the power supply and the load needs to be disconnected, an additional circuit needs to be set up to trigger the self-locking circuit to disconnect, which increases circuit costs and control costs. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power control circuit and a control method thereof, a controller, and an electrical device, which realize the connection and disconnection between the power supply and the load by changing the length of a pulse signal, thereby reducing the circuit cost and the control cost.

[0005] An embodiment of the first aspect of the present application provides a power control circuit, including:

[0006] A first switch device comprises a first control end, a first end and a second end, wherein the first end is connected to a power supply, the second end is connected to a load, and the first control end is used to controllably conduct the first end and the second end;

[0007] The self-locking circuit comprises a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to a received pulse signal, thereby conducting the first control terminal;

[0008] A charging trigger circuit includes a charging circuit and a trigger switch, wherein the charging circuit is used to charge using the received pulse signal and turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold to bypass the self-locking switch, thereby causing the self-locking switch to enter an off state after the pulse signal stops.

[0009] The power control circuit of the first aspect of the present application has at least the following beneficial effects: a specific pulse signal is input into the self-locking circuit and the charging trigger circuit, the pulse signal turns on the self-locking switch and keeps it in the on state, at which time the first control end of the first switch device is also turned on, so that the power supply is connected to the load end; the pulse signal also charges the charging circuit in the charging trigger circuit, and the charging voltage is related to the duration of the pulse signal; when the charging voltage exceeds the preset voltage threshold (the pulse signal does not stop before the preset voltage threshold is reached), the charging circuit turns on the trigger switch and bypasses the self-locking switch. If the pulse signal stops thereafter, the current in the self-locking switch is zero, and the self-locking switch returns to the off state. At this time, the charging circuit starts to self-discharge, and the charging voltage turns off when it is lower than the preset voltage threshold. At this time, the first switch device The device is turned off, the power supply is disconnected from the load end, and the power supply is turned off; when the charging voltage does not exceed the preset voltage threshold (the pulse signal stops before reaching the preset voltage threshold), the self-locking switch remains in the on state, the trigger switch remains in the off state, and the power supply remains connected to the load end; it can be seen that based on the above circuit structure, the duration of the pulse signal (the duration of the high level or low level of the pulse signal is related to the size of the charging voltage) can be used to realize the conduction and disconnection between the power supply and the load end. When the duration of the pulse signal is short, the power supply and the load end can remain on, and there is no need to continue to output the pulse signal, so zero power consumption can be achieved to maintain the power supply to the load end; if the connection between the power supply and the load end needs to be disconnected, a pulse signal with a longer duration is input, which can trigger the power supply to be disconnected from the load end. It can be seen that the connection and disconnection of the power supply are controlled by the length of the pulse signal. Compared with the prior art that uses different control circuits to control the conduction and disconnection of the self-locking circuit, the circuit of the embodiment of the present application can reduce the circuit cost and the control cost.

[0010] According to some embodiments of the present application, the self-locking switch includes a second switching device and a third switching device, the second switching device includes a second control terminal, a third terminal and a fourth terminal, the third switching device includes a third control terminal, a fifth terminal and a sixth terminal, the third terminal is connected to the first control terminal, the fourth terminal is connected to the third control terminal, the fifth terminal is connected to the second control terminal, and the sixth terminal is connected to the low potential terminal; the second control terminal is used to turn on the third terminal and the fourth terminal when a low level is applied, and the third control terminal is used to turn on the fifth terminal and the sixth terminal when a high level is applied.

[0011] According to some embodiments of the present application, the self-locking circuit further includes a third resistor, and the third control terminal is connected to the conduction control terminal through the third resistor.

[0012] According to some embodiments of the present application, the trigger switch includes a first resistor and a fourth switching device, the fourth switching device includes a fourth control terminal, a seventh terminal and an eighth terminal, the fourth control terminal is connected to the charging circuit, the seventh terminal is connected to the power supply through the first resistor, the connection point between the seventh terminal and the first resistor is connected to the first control terminal, and the eighth terminal is connected to the low potential terminal.

[0013] According to some embodiments of the present application, the charging circuit includes a charging capacitor, one end of the charging capacitor is connected to the fourth control end, and the other end of the charging capacitor is connected to the eighth end.

[0014] According to some embodiments of the present application, an optocoupler switch module is also included, which includes a signal input terminal, a first sensing terminal and a second sensing terminal. The optocoupler switch module is used to turn on the first sensing terminal and the second sensing terminal when the signal input terminal receives a control signal, the first sensing terminal is connected to the power supply, the second sensing terminal is used to output the pulse signal corresponding to the control signal, and the conduction control terminal and the charging circuit are both connected to the second sensing terminal.

[0015] According to some embodiments of the present application, the optocoupler switch module includes an optocoupler device, which includes an anode pin, a cathode pin, a first switch pin, and a second switch pin. The anode pin is connected to a constant voltage source, the cathode pin is connected to the signal input end, the first switch pin is connected to the first sensing end, and the second switch pin is connected to the second sensing end.

[0016] According to some embodiments of the present application, the optocoupler switch module also includes a fifth switching device and a signal pin, the fifth switching device includes a fifth control terminal, a ninth terminal and a tenth terminal, the ninth terminal is connected to the cathode pin, the tenth terminal is connected to the ground terminal, and the fifth control terminal is connected to the signal pin to receive the control signal.

[0017] According to some embodiments of the present application, the pulse signal is a high-level signal having a preset voltage value, and the pulse signal is used to increase the charging voltage of the charging circuit to the preset voltage threshold after a preset time period.

[0018] A second aspect of the present application provides a control method for a power control circuit, wherein the power control circuit comprises:

[0019] A first switch device comprises a first control end, a first end and a second end, wherein the first end is connected to a power supply, the second end is connected to a load, and the first control end is used to controllably conduct the first end and the second end;

[0020] The self-locking circuit comprises a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to a received pulse signal, thereby conducting the first control terminal;

[0021] A charging trigger circuit, comprising a charging circuit and a trigger switch, wherein the charging circuit is used to charge using the received pulse signal, and to turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold, so as to bypass the self-locking switch, thereby causing the self-locking switch to enter an off state after the pulse signal stops;

[0022] The control method comprises:

[0023] Sending a first pulse signal to the self-locking circuit and the charging trigger circuit to connect the power supply to the load, wherein the duration of the first pulse signal is less than a preset time threshold;

[0024] Alternatively, a second pulse signal is sent to the self-locking circuit and the charging trigger circuit to disconnect the power supply from the load, and the duration of the second pulse signal is greater than or equal to the preset time threshold;

[0025] The preset time threshold is the time required by the pulse signal to make the charging voltage of the charging circuit reach the preset voltage threshold.

[0026] The control method of the second embodiment of the present application has at least the following beneficial effects: based on the circuit structure of the first embodiment above, according to the requirements of power on and off, the duration of the pulse signal is set, when the power supply and the load need to be connected, the duration of the first pulse signal output is shorter, the self-locking switch is turned on and the trigger switch is not turned on, thereby connecting the power supply and the load; when the power supply and the load need to be disconnected, the duration of the second pulse signal output is longer, the trigger switch bypasses the self-locking switch, so that the current of the self-locking switch is zero when the second pulse signal stops, and the charging circuit discharges so that the trigger switch returns to the off state, thereby disconnecting the power supply and the load; through the above control method, the power supply can be turned on and off by the length of the pulse signal, and zero power consumption operation is achieved by relying on the self-locking circuit when the power is turned on, and the connection between the power supply and the load is disconnected by relying on the charging trigger circuit when the power is turned off. Compared with the prior art that uses different control circuits to control the on and off of the self-locking circuit, the circuit of the embodiment of the present application can reduce circuit cost and control cost.

[0027] The third aspect of the present application provides a controller, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method described in the second aspect above when running the computer program.

[0028] A fourth aspect of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method as described in the second aspect above.

[0029] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a circuit diagram of controlling the on and off of a power supply through an optocoupler device in the related art;

[0031] Figure 2 is a circuit diagram of a power control circuit provided in an embodiment of the present application;

[0032] Figure 3 It is a structural diagram of the system platform architecture provided by the embodiment of the present application;

[0033] Figure 4 is a flow chart of a control method for turning on a power supply provided by an embodiment of the present application;

[0034] Figure 5 This is a flow chart of the control method provided in an embodiment of the present application to disconnect the power supply. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0036] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0038] At present, isolated power supply control circuits all use isolated optocouplers to control the on and off of the switch tube. Optocoupler switches usually require continuous input of control signals at the signal input end to keep the switch on at the other end, thereby keeping the power supply connected to the load. This results in the need to input control signals at the signal input end of the optocoupler switch for a long time when the load is in use. The optocoupler switch consumes electrical energy when it is powered on for a long time. Only when the power supply is not connected to the load will the optocoupler switch not consume electrical energy. Figure 1 The optocoupler switch circuit diagram shows that the power supply is connected to the load end Vdd through the switch tube Q6. The power supply can be connected to the load end by turning on the switch tube Q6. The control end of Q6 is connected to one end of the optocoupler switch device U1. The other end of the optocoupler switch device U1 is respectively connected to the 5V input and the signal control circuit of the MCU. At this time, the control end of the switch tube Q6 is at a high potential and Q6 is not turned on. The signal control circuit of the MCU includes a switch tube Q7. The control end of the switch tube Q7 is connected to the MCU for receiving the control signal of the MCU. When the switch tube Q6 needs to be turned on, the MCU inputs a control signal to turn on Q7, and the 5V input is connected to the MCUGND through Q7, so that the photosensitive circuit on the VCC side of the optocoupler switch device U1 is turned on. At this time, VCC is connected to GND through resistors R404 and R406, so that the control end of the switch tube Q6 is pulled down, and the switch tube Q6 is turned on, realizing the connection between VCC and Vdd.

[0039] It can be seen from this that, for electrical equipment that is in operation for a long time, the above circuit needs to turn on the optocoupler device U1 for a long time, which is obviously not conducive to the energy-saving operation of the equipment.

[0040] On the other hand, in the related art, a self-locking circuit can be used to keep the self-locking circuit in the on state through a single trigger signal. The use of a self-locking circuit in the power control circuit can, to a certain extent, solve the problem of power consumption by the optocoupler switch when the power is turned on. However, the shutdown of the self-locking circuit requires another circuit to control it. The signal originally used to trigger the self-locking circuit to turn on often cannot turn off the self-locking circuit. Therefore, the power control circuit using a self-locking circuit requires additional circuit costs. This circuit requires another control signal input, which also increases the control cost of the circuit.

[0041] Based on this, the embodiments of the present application provide a power supply control circuit and its control method, a controller, and an electrical device. The power supply control circuit outputs a specific pulse signal, which is used to turn on the self-locking circuit and keep it turned on, so that the power supply is connected to the load, and at the same time, the charging voltage of the charging trigger circuit rises. When the charging voltage rises to a preset voltage threshold, the trigger switch in the charging trigger circuit is turned on to bypass the self-locking switch, and the trigger switch is discharged and turned off after the pulse signal ends, so that the power supply is disconnected from the load. In this way, a single pulse signal is used to control the connection and disconnection of the power supply, thereby reducing circuit costs and control costs.

[0042] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0043] like Figure 2 As shown, Figure 2 : is a system architecture diagram of a power control circuit provided by an embodiment of the present application, and the power control circuit includes:

[0044] The first switch device Q1 comprises a first control terminal, a first terminal and a second terminal, wherein the first terminal is connected to a power supply, the second terminal is connected to a load, and the first control terminal is used to control the first terminal and the second terminal to conduct;

[0045] The self-locking circuit 2 includes a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to the received pulse signal, thereby conducting the first control terminal;

[0046] The charging trigger circuit 3 includes a charging circuit and a trigger switch. The charging circuit is used to charge using the received pulse signal and turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold to bypass the self-locking switch, thereby causing the self-locking switch to enter the off state after the pulse signal stops.

[0047] Among them, the power supply control circuit also includes an optocoupler switch module 1, which includes a signal input terminal, a first sensing terminal and a second sensing terminal. The optocoupler switch module 1 is used to conduct the first sensing terminal and the second sensing terminal when the signal input terminal receives a control signal. The first sensing terminal is connected to a power supply, and the second sensing terminal is used to output a pulse signal corresponding to the control signal. The conduction control terminal and the charging circuit are both connected to the second sensing terminal.

[0048] One end of the optocoupler switch module 1 is a signal input end for receiving a control signal, and the other end of the optocoupler switch module 1 is a controlled switch part, including a first sensing end and a second sensing end; when the signal input end receives a control signal, the first sensing end and the second sensing end are connected. The first sensing end is connected to a power supply, and the second sensing end is connected to a conduction control end in the self-locking circuit 2 and a charging circuit in the charging trigger circuit 3; in actual use, the control signal is used to affect the optocoupler switch module 1 to output a pulse signal at the second sensing end, and the pulse signal is a signal in the form of a level, and the self-locking circuit 2 and the charging trigger circuit 3 are triggered to work according to the level.

[0049] The conduction control terminal of the self-locking circuit 2 is used to receive a pulse signal. When the pulse signal conducts the self-locking switch, the self-locking switch can remain on by itself without the need to continuously input the pulse signal, that is, without the need to continuously input the control signal. The pulse signal can be a high-level triggering self-locking switch, or a low-level triggering self-locking switch, which depends on the conduction voltage characteristics of the self-locking switch. When the self-locking switch is high-level conduction, when the high-level signal of the pulse signal arrives, the self-locking switch is triggered to turn on and remain on. When the self-locking switch is low-level conduction, when the low-level signal of the pulse signal arrives, the self-locking switch is triggered to turn on and remain on. At this time, the first control terminal is also controlled to be turned on. At this time, the power supply supplies power to the load through the first switch device Q1. Since the self-locking switch remains on, the signal input terminal can stop inputting the control signal, and the connection between the power supply and the load is not affected.

[0050] The charging circuit of the charging trigger circuit 3 is used to receive a pulse signal. The pulse signal is charged in the charging circuit. According to the length of the pulse signal, the charging voltage of the charging circuit is different. The size of the charging voltage affects the working state of the trigger switch, and then determines whether to affect the self-locking switch. Specifically, when the charging voltage does not reach the preset voltage threshold, the pulse signal stops, the trigger switch does not operate, the self-locking switch is not affected, and the power control circuit maintains the working state of the power supply supplying power to the load; when the charging voltage reaches the preset voltage threshold, the trigger switch is turned on, the trigger switch is connected in parallel with the self-locking switch, and the trigger switch bypasses the self-locking switch when it is turned on. If the pulse signal does not stop at this time, the power control circuit can still maintain the working state of the power supply supplying power to the load, but if the pulse signal stops at this time, the current on the self-locking switch is zero, the self-locking switch is turned off, and the charging circuit discharges itself at the same time, and when the discharge reaches the preset voltage threshold, the trigger switch is turned off, so that the first control end is controlled to disconnect the first end and the second end.

[0051] It can be seen that by adjusting the duration of the control signal, the duration of the pulse signal can be controlled, and then the magnitude of the charging voltage can be controlled, and finally the connection and disconnection of the power supply and the load can be controlled. When the control signal makes the charging voltage less than the preset voltage threshold, the power supply and the load remain connected, and when the control signal makes the charging voltage greater than or equal to the preset voltage threshold, the power supply and the load are disconnected.

[0052] It is understandable that the signal form of the above control signal is not limited, and the pulse signal can be a high level triggering the self-locking circuit 2, or a low level triggering the self-locking circuit 2; in a possible embodiment, the control signal is also a level signal, such as a high level pulse, and the pulse signal output by the optocoupler switch module 1 is also a level signal, and is also a high level pulse. Assuming that the self-locking circuit 2 is triggered to turn on by a high level, the control signal can trigger the connection between the power supply and the load when it is a high level pulse; assuming that the self-locking circuit 2 is triggered to turn on by a low level, the control signal is a high level pulse and does not trigger the self-locking circuit 2, but after the high level pulse ends, it becomes a low level and triggers the self-locking circuit 2 to turn on, thereby triggering the connection between the power supply and the load. Correspondingly, the charging trigger circuit 3 also realizes charging triggering according to the level of the pulse signal, which will not be described in detail here.

[0053] Assuming that the self-locking circuit 2 is turned on by high-level triggering, and the control signal and the pulse signal are both high-level pulses, the circuit structure of the above power control circuit is specifically connected as follows:

[0054] The optocoupler switch module 1 is used to turn on the first sensing end and the second sensing end after receiving a high-level signal of the control signal at the signal input end. The first switch device Q1 is a low-voltage conduction type voltage device. When a low-level signal is applied, the power supply and the load are turned on. At this time, the first control end of the first switch device Q1 is connected to the low-potential end through the self-locking switch and is also connected to the low-potential end through the trigger switch; after the conduction control end receives a high-level signal of the pulse signal, the self-locking switch is triggered to turn on and maintain the conduction state; the trigger switch is a high-level conduction type voltage device. When the charging voltage exceeds the preset voltage threshold, the trigger switch is turned on. , thereby bypassing the self-locking switch. At this time, if the pulse signal has not stopped, the first control terminal is connected to the low potential through the trigger switch, so the power supply and the load are still connected, but when the pulse signal stops, the self-locking switch becomes off due to the zero current, and the charging circuit begins to self-discharge, and the charging voltage drops. Before the charging voltage drops to the preset voltage threshold, the trigger switch is still on, and the power supply and the load are still connected, but after the charging voltage drops to the preset voltage threshold, the trigger switch is turned off, and there is no path between the first control terminal and the low potential terminal, the first control terminal is pulled up, and the power supply and the load are disconnected.

[0055] It can be seen that by adjusting the length of the level signal through a single control signal, the function of turning on and off the power supply can be achieved, and there is no need to set up an additional circuit disconnect self-locking switch, thereby reducing circuit costs and control costs.

[0056] In some embodiments, the self-locking switch includes a second switching device Q2 and a third switching device Q3, the second switching device Q2 includes a second control terminal, a third terminal and a fourth terminal, the third switching device Q3 includes a third control terminal, a fifth terminal and a sixth terminal, the third terminal is connected to the first control terminal, the fourth terminal is connected to the third control terminal, the fifth terminal is connected to the second control terminal, and the sixth terminal is connected to the low potential terminal; the second control terminal is used to turn on the third terminal and the fourth terminal when a low level is applied, and the third control terminal is used to turn on the fifth terminal and the sixth terminal when a high level is applied.

[0057] The self-locking switch is composed of a second switch device Q2 and a third switch device Q3. Assuming that the self-locking switch is triggered by a high level, the second switch device Q2 is turned on at a low level, and the third switch device Q3 is turned on at a high level. When the third control terminal of the third switch device Q3 receives a high level signal, the fifth terminal and the sixth terminal are connected. At this time, the sixth terminal is connected to the low potential terminal, and the fifth terminal is pulled down, that is, the second control terminal of the second switch device Q2 is pulled down, and the second switch device Q2 is also turned on, so that the third terminal and the fourth terminal are connected. At this time, the third terminal is also pulled down to the low potential terminal. At this time, the first switch device Q1 is turned on at a low level, so at this time, the first terminal and the second terminal of the first switch device Q1 are connected. It can be known that the first control terminal of the first switch device Q1 is pulled up in normal state, so when the second switch device Q2 and the third switch device Q3 are turned on, the pull-up voltage is applied to the third control terminal through the third terminal and the fourth terminal, and the third switch device Q3 can remain turned on, and the second switch device Q2 can also remain turned on, thereby achieving self-locking conduction.

[0058] In some embodiments, the trigger switch includes a first resistor R1 and a fourth switching device Q4, the fourth switching device Q4 includes a fourth control terminal, a seventh terminal and an eighth terminal, the fourth control terminal is connected to the charging circuit, the seventh terminal is connected to the power supply through the first resistor R1, the connection point between the seventh terminal and the first resistor R1 is connected to the first control terminal, and the eighth terminal is connected to the low potential terminal.

[0059] The power supply pulls up the first control terminal through the first resistor R1. When the self-locking switch and the fourth switch device Q4 are both turned off, the power supply is connected to the connection point between the first control terminal and the self-locking switch through the first resistor R1. The power supply is also connected to the low potential terminal through the first resistor R1 and the fourth switch device Q4. Therefore, it can be seen that when the load is not in use, the power supply is not conductive to the low potential terminal. Pulling up the first control terminal is equivalent to applying a high level to the first control terminal. At this time, the first switch device Q1 is not conductive. When the self-locking switch is turned on, the power supply is connected to the low potential terminal through the first resistor R1 and the self-locking switch, and the first control terminal is pulled down, so that the first switch device Q1 is turned on; similarly, after the self-locking switch is turned on, if the trigger switch is also turned on, the power supply is also connected to the low potential terminal through the first resistor R1 and the trigger switch, and the first switch device Q1 is also turned on. The fourth control terminal of the fourth switch device Q4 is triggered by a voltage greater than or equal to a preset voltage threshold, which can be an N-channel MOS tube or an NPN transistor.

[0060] In some embodiments, the charging circuit includes a charging capacitor C2, one end of the charging capacitor C2 is connected to the fourth control terminal, and the other end is connected to the eighth terminal. The charging circuit uses the charging capacitor C2 to charge, and when the pulse signal arrives, when the voltage of the pulse signal is constant, the duration of the pulse signal corresponds to the charging voltage. Therefore, it can be seen that the charging capacitor C2 is connected in parallel between the fourth control terminal and the eighth terminal of the fourth switch tube, thereby providing a conduction voltage for the fourth control terminal.

[0061] In addition, the charging circuit also includes a fourth resistor R4, a fifth resistor R5 and a diode D1, the second sensing end is connected to the fourth control end through the diode D1 and the fourth resistor R4, the connection point between the fourth resistor R4 and the fourth control end is connected to one end of the charging capacitor C2, and is also connected to one end of the fifth resistor R5, and the other end of the charging capacitor C2 and the other end of the fifth resistor R5 are connected to the low potential end, that is, the charging capacitor C2 and the fifth resistor R5 are connected in parallel. Based on the charging circuit of this structure, the time t required for the charging capacitor C2 to be charged to the preset voltage threshold is determined by the following formula:

[0062] t=R4C2ln[(V1-V0) / (V1-Vt)]

[0063] Wherein R4 is the resistance value of the fourth resistor R4, C2 is the capacitance value of the charging capacitor C2, V0 is the initial voltage value on the charging capacitor C2, usually V0=0, V1=VCC-Vd (Vd is the tube voltage drop of the diode D1); Vt is equal to the turn-on voltage threshold of the fourth switching device Q4, that is, the preset voltage threshold.

[0064] In some embodiments, the optocoupler switch module 1 includes an optocoupler device IC1, which includes an anode pin, a cathode pin, a first switch pin and a second switch pin. The anode pin is connected to a constant voltage source, the cathode pin is connected to a signal input terminal, the first switch pin is connected to a first sensing terminal, and the second switch pin is connected to a second sensing terminal.

[0065] One side of the anode pin and the cathode pin is used to input a weak current control signal, and one side of the first switch pin and the second switch pin is used to turn on the power supply of the power supply to the load, wherein the constant voltage source connected to the anode pin can be a 5V constant voltage source, and by adjusting the conduction mode between the anode pin and the cathode pin, such as intermittent conduction, a corresponding light signal can be generated, thereby inducing a pulse signal on the first switch pin and the second switch pin; the first switch pin is connected to the power supply, and when turned on, the power supply is connected to the channel self-locking circuit 2 and the charging trigger circuit 3, respectively realizing conduction self-locking and charging.

[0066] In some embodiments, the optocoupler switch module 1 also includes a fifth switching device Q5 and a signal pin, the fifth switching device Q5 includes a fifth control terminal, a ninth terminal and a tenth terminal, the ninth terminal is connected to the cathode pin, the tenth terminal is connected to the ground terminal, and the fifth control terminal is connected to the signal pin to receive a control signal.

[0067] The fifth control terminal is connected to the signal input terminal, and the fifth switch device Q5 is turned on and off by the control signal. Taking the pulse signal induced on the first switch pin and the second switch pin as an example, the control signal can also be in the form of a pulse. When the control signal is at a high level, the fifth switch device Q5 is turned on, and the constant voltage source is connected to the ground terminal through the anode pin, the cathode pin, the ninth terminal and the tenth terminal. At this time, the LED in the optocoupler device IC1 is on, and the first switch pin and the second switch pin are turned on, so that the power supply can supply power to the self-locking circuit 2 and the charging trigger circuit 3.

[0068] For the control method of the power control circuit in the above embodiment, specific reference may be made to the control method in the following embodiment.

[0069] like Figure 3 As shown, Figure 3 It is a schematic diagram of a system architecture platform for executing a control method for a power control circuit provided by an embodiment of the present application.

[0070] The system architecture platform 1000 of the embodiment of the present application includes one or more processors 1100 and a memory 1200. Figure 3 A processor 1100 and a memory 1200 are taken as an example.

[0071] The processor 1100 and the memory 1200 may be connected via a bus or other means. Figure 3The example of connecting through bus is taken in the following.

[0072] The memory 1200, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 1200 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1200 may optionally include a memory 1200 remotely arranged relative to the processor 1100, and these remote memories may be connected to the system architecture platform 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0073] Those skilled in the art will understand that Figure 3 The device structure shown in the figure does not constitute a limitation on the system architecture platform 1000, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0074] exist Figure 3 In the system architecture platform 1000 shown, the processor 1100 can be used to call the air conditioner control program stored in the memory 1200, so as to implement the control method of the power control circuit.

[0075] Based on the hardware structure of the above-mentioned system architecture platform 1000, various embodiments of the control method of the power control circuit of the present application are proposed.

[0076] Reference Figure 4 and Figure 5 As shown, the second embodiment of the present application provides a control method for a power control circuit, such as Figure 2 As shown, the power control circuit includes:

[0077] The first switch device Q1 comprises a first control terminal, a first terminal and a second terminal, wherein the first terminal is connected to a power supply, the second terminal is connected to a load, and the first control terminal is used to control the first terminal and the second terminal to conduct;

[0078] The self-locking circuit 2 includes a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to the received pulse signal, thereby conducting the first control terminal;

[0079] The charging trigger circuit 3 includes a charging circuit and a trigger switch. The charging circuit is used to charge using the received pulse signal and turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold to bypass the self-locking switch, thereby causing the self-locking switch to enter an off state after the pulse signal stops.

[0080] Control methods include:

[0081] Step S100, sending a first pulse signal to the self-locking circuit 2 and the charging trigger circuit 3 to connect the power supply to the load, and the duration of the first pulse signal is less than a preset time threshold;

[0082] or,

[0083] Step S200, sending a second pulse signal to the self-locking circuit 2 and the charging trigger circuit 3 to disconnect the power supply from the load, and the duration of the second pulse signal is greater than or equal to a preset time threshold;

[0084] The preset time threshold is the time required for the pulse signal to make the charging voltage of the charging circuit reach the preset voltage threshold.

[0085] The circuit structure can refer to the power control circuit of the first embodiment of the present application, and will not be repeated here. With respect to the control method, the main purpose is to generate two signals with different pulse signal lengths. The shorter pulse signal is used to trigger the self-locking circuit 2 to turn on, and the longer pulse signal is used to increase the charging voltage of the charging circuit to reach or exceed the preset charging threshold. The pulse signal corresponds to the control signal, so it can be known that the control signal is adjusted to obtain different pulse signals.

[0086] Taking the pulse signal as a high-level signal as an example, when the high-level duration of the first pulse signal corresponding to the first control signal is short, the self-locking circuit 2 is turned on, the power supply circuit and the load are connected, and the charging voltage in the charging trigger circuit 3 has not reached the preset voltage threshold. At this time, after the first control signal, the power supply circuit and the load can still remain connected, and the power supply is turned on. When the high-level duration of the second pulse signal corresponding to the second control signal is long, the self-locking circuit 2 is turned on, the power supply circuit and the load are connected, and the charging voltage in the charging trigger circuit 3 reaches the preset voltage threshold. At this time, after the second control signal, since the trigger switch bypasses the self-locking switch, the self-locking switch becomes the off state after the power is turned off, the charging circuit self-discharges, and the charging voltage drops to the preset voltage threshold. The trigger switch automatically disconnects, then the power supply circuit and the load are disconnected, and the power supply is disconnected.

[0087] It can be seen that the length of the charging time and the level of the pulse signal affect the speed at which the charging voltage reaches the preset voltage threshold. Different preset voltage thresholds can be set according to the characteristics of the components in the circuit and the characteristics of the control signal, so as to select a matching trigger switch. In a possible embodiment, the pulse signal is a high-level signal, and the time t required for the charging capacitor C2 to be charged to the preset voltage threshold is determined by the following formula:

[0088] t=R4C2ln[(V1-V0) / (V1-Vt)]

[0089] Wherein R4 is the resistance value of the fourth resistor R4, C2 is the capacitance value of the charging capacitor C2, V0 is the initial voltage value on the charging capacitor C2, usually V0=0, V1=VCC-Vd (Vd is the tube voltage drop of the diode D1); Vt is equal to the turn-on voltage threshold of the fourth switch tube (ie, the trigger switch), that is, the preset voltage threshold.

[0090] Through the above control method, the conduction and disconnection between the power supply and the load end are realized by utilizing the different durations of the pulse signal. When the duration of the pulse signal is short, the power supply and the load end can remain connected, and there is no need to continuously apply the control signal to trigger the pulse signal, so it is possible to achieve zero power consumption to maintain the power supply of the load end; if it is necessary to disconnect the power supply and the load end, a control signal with a longer duration is input, and the duration of the corresponding pulse signal is also longer, which can trigger the power supply to be disconnected from the load end. It can be seen from this that by inputting a control signal through a signal input terminal, and controlling the connection and disconnection of the power supply by utilizing the length of the pulse signal corresponding to the control signal, compared with the prior art that uses different control circuits to control the conduction and disconnection of the self-locking circuit 2, the circuit of the embodiment of the present application can reduce the circuit cost and also reduce the control cost.

[0091] The power control circuit and control method of the present application are described in detail below through a specific example.

[0092] Reference Figure 2 The power control circuit shown in the figure has a power supply control circuit whose power supply is determined by the pulse length of the control signal sent by the controller. When the pulse length is shorter than the set value, the power supply of the circuit is automatically turned on. When the pulse length is greater than the set value, the power supply of the circuit is automatically turned off.

[0093] When the controller sends a control pulse, the switch tube Q5 is turned on, the optocoupler light-emitting diode is powered through the resistor R2, and the phototransistor is turned on. VCC is loaded onto the base of the switch tube Q3 through the resistor R3, the switch tube Q3 is turned on, and the base of the switch tube Q2 is pulled down by the turned-on switch tube Q3, so that the switch tube Q2 is turned on, and the base of the switch tube Q3 is pulled up by VCC through the turned-on switch tube Q2 and the resistor R1. Therefore, the switch tubes Q2 and Q3 are always turned on. The gate of the switch tube Q1 is pulled down by the turned-on switch tubes Q2 and Q3, and the switch tube Q1 is turned on. At this time, the voltage Vg of the gate of the switch tube Q1 is the sum of the conduction tube voltage drop Vce of the switch tube Q2 and the base tube voltage drop Vbe of the switch tube Q3, that is, Vg=Vce+Vbe.

[0094] At the same time, when the controller sends a control pulse, the switch tube Q5 is turned on, the optocoupler light-emitting diode is energized through the resistor R2, and the phototransistor is turned on. VCC charges the capacitor C2 through the diode D1 and the resistor R4. When the voltage across the capacitor C2 exceeds the turn-on voltage threshold Vt of the switch tube Q4, the switch tube Q4 is turned on. After the switch tube Q4 is turned on, the voltage Vg of the gate of the switch tube Q1 is 0. When the control pulse of the controller stops, the switch tube Q4 continues to be turned on due to the charging of the capacitor C2, while the bases of the switch tubes Q2 and Q3 are turned off because there is no current passing through. After the charge of the capacitor C2 is released through the resistor R5, the switch tube Q4 is turned off, the gate of the switch tube Q1 is pulled up by the resistor R1, the switch tube Q1 is turned off, the load is disconnected from the power supply, and the load power supply control is realized. Therefore, when the control pulse time is greater than the time t, the circuit realizes the load power supply shutdown control.

[0095] Where time t satisfies t=R4C2ln[(V1-V0) / (V1-Vt)]

[0096] Wherein R4 is the resistance value of the fourth resistor R4, C2 is the capacitance value of the charging capacitor C2, V0 is the initial voltage value on the charging capacitor C2, usually V0=0, V1=VCC-Vd (Vd is the tube voltage drop of the diode D1); Vt is equal to the turn-on voltage threshold of the fourth switch tube (ie, the trigger switch), that is, the preset voltage threshold.

[0097] Obviously, when the control pulse of the controller is issued, the optocoupler does not need to continue to supply power to achieve zero-loss control. The switch tube Q1 is a voltage-controlled device, and it is only necessary to pull down the gate voltage of the switch tube Q1 to achieve zero-loss control.

[0098] In addition, an embodiment of the present application also provides a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned control method when executing the computer program.

[0099] An embodiment of the present application further provides an electrical device, including the aforementioned power control circuit, or including the aforementioned controller.

[0100] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network nodes. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0102] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A power control circuit, characterized in that: include: A first switch device comprises a first control end, a first end and a second end, wherein the first end is connected to a power supply, the second end is connected to a load, and the first control end is used to controllably conduct the first end and the second end; The self-locking circuit comprises a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to a received pulse signal, thereby conducting the first control terminal; A charging trigger circuit includes a charging circuit and a trigger switch, wherein the charging circuit is used to charge using the received pulse signal and turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold to bypass the self-locking switch, thereby causing the self-locking switch to enter an off state after the pulse signal stops.

2. The power control circuit according to claim 1, characterized in that: The self-locking switch includes a second switching device and a third switching device, the second switching device includes a second control terminal, a third terminal and a fourth terminal, the third switching device includes a third control terminal, a fifth terminal and a sixth terminal, the third terminal is connected to the first control terminal, the fourth terminal is connected to the third control terminal, the fifth terminal is connected to the second control terminal, and the sixth terminal is connected to the low potential terminal; the second control terminal is used to turn on the third terminal and the fourth terminal when a low level is applied, and the third control terminal is used to turn on the fifth terminal and the sixth terminal when a high level is applied.

3. The power control circuit according to claim 2, characterized in that: The self-locking circuit further includes a third resistor, and the third control terminal is connected to the conduction control terminal through the third resistor.

4. The power control circuit according to claim 1, characterized in that: The trigger switch includes a first resistor and a fourth switching device, the fourth switching device includes a fourth control terminal, a seventh terminal and an eighth terminal, the fourth control terminal is connected to the charging circuit, the seventh terminal is connected to the power supply through the first resistor, the connection point between the seventh terminal and the first resistor is connected to the first control terminal, and the eighth terminal is connected to the low potential terminal.

5. The power control circuit according to claim 4, characterized in that: The charging circuit includes a charging capacitor, one end of the charging capacitor is connected to the fourth control end, and the other end of the charging capacitor is connected to the eighth end.

6. The power control circuit according to claim 1, characterized in that: It also includes an optocoupler switch module, which includes a signal input terminal, a first sensing terminal and a second sensing terminal. The optocoupler switch module is used to conduct the first sensing terminal and the second sensing terminal when the signal input terminal receives a control signal. The first sensing terminal is connected to the power supply, and the second sensing terminal is used to output the pulse signal corresponding to the control signal. The conduction control terminal and the charging circuit are both connected to the second sensing terminal.

7. The power control circuit according to claim 6, characterized in that: The optocoupler switch module includes an optocoupler device, which includes an anode pin, a cathode pin, a first switch pin, and a second switch pin. The anode pin is connected to a constant voltage source, the cathode pin is connected to the signal input end, the first switch pin is connected to the first sensing end, and the second switch pin is connected to the second sensing end.

8. The power control circuit according to claim 7, characterized in that: The optocoupler switch module also includes a fifth switch device and a signal pin, the fifth switch device includes a fifth control terminal, a ninth terminal and a tenth terminal, the ninth terminal is connected to the cathode pin, the tenth terminal is connected to the ground terminal, and the fifth control terminal is connected to the signal pin to receive the control signal.

9. The power control circuit according to any one of claims 1 to 8, characterized in that: The pulse signal is a high-level signal with a preset voltage value, and the pulse signal is used to increase the charging voltage of the charging circuit to the preset voltage threshold after a preset time period.

10. A control method for a power control circuit, characterized in that: The power control circuit comprises: A first switch device comprises a first control end, a first end and a second end, wherein the first end is connected to a power supply, the second end is connected to a load, and the first control end is used to controllably conduct the first end and the second end; The self-locking circuit comprises a conduction control terminal and a self-locking switch, wherein the conduction control terminal is used to trigger the self-locking switch to maintain a conduction state according to a received pulse signal, thereby conducting the first control terminal; A charging trigger circuit, comprising a charging circuit and a trigger switch, wherein the charging circuit is used to charge using the received pulse signal, and to turn on the trigger switch when its own charging voltage exceeds a preset voltage threshold, so as to bypass the self-locking switch, thereby causing the self-locking switch to enter an off state after the pulse signal stops; The control method comprises: Sending a first pulse signal to the self-locking circuit and the charging trigger circuit to connect the power supply to the load, wherein the duration of the first pulse signal is less than a preset time threshold; Alternatively, a second pulse signal is sent to the self-locking circuit and the charging trigger circuit to disconnect the power supply from the load, and the duration of the second pulse signal is greater than or equal to the preset time threshold; The preset time threshold is the time required by the pulse signal to make the charging voltage of the charging circuit reach the preset voltage threshold.

11. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method according to claim 10 when executing the computer program.

12. An electrical equipment, characterized in that: It comprises the power supply control circuit as claimed in any one of claims 1 to 9 or the controller as claimed in claim 11.

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