Power supply self-locking power supply circuit and electronic equipment

Abstract

The utility model discloses a power supply self-locking power supply circuit and an electronic device, the power supply self-locking power supply circuit comprises a switch module and a self-locking control module, the output end of the self-locking control module is connected with the input end of the switch module, and the output end of the switch module is connected with the input end of the self-locking control module; the switch module is connected to a power supply and inputs an excitation signal to the switch module, so that the switch module outputs a working voltage to the self-locking control module; the self-locking control module accesses the working voltage and outputs a self-locking signal to the switch module, so that the switch module maintains a self-locking state. The self-locking loop is arranged to maintain the self-locking power supply of the power supply, so that the MCU main controller does not need to continuously output level, the power supply can enter a high-resistance state or a sleep mode, the power consumption of the single-chip microcomputer control circuit during working is reduced, and the service life of the power supply is further prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, and it is a kind of power supply self-locking power supply circuit and electronic equipment. BACKGROUND

[0002] At present, a large number of electronic products existing in market adopt single-chip microcomputer control circuit, provide the power required for work or cut off power supply to realize zero power consumption standby, can well prolong the use time of energy, especially when using battery as energy supply.The inventor found that in the prior art, when single-chip microcomputer control circuit provides the power required for work, it is necessary to maintain the IO port output level of single-chip microcomputer, even if the output current of single-chip microcomputer is smaller, a small amount of electric energy will be extracted from power supply, and the problem of further reducing the power consumption of single-chip microcomputer control circuit when working cannot be solved. SUMMARY

[0003] Therefore, the utility model aims at providing a kind of power supply self-locking power supply circuit and electronic equipment, to solve the problem of further reducing the power consumption of single-chip microcomputer control circuit when working.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] Firstly, a power supply self-locking power supply circuit is provided, comprising a switching module and a self-locking control module, the output end of the self-locking control module is connected with the input end of the switching module, and the output end of the switching module is connected with the input end of the self-locking control module.

[0006] The switching module is connected to the power supply, and the excitation signal is input to the switching module, so that the switching module outputs the working voltage to the self-locking control module.

[0007] The self-locking control module is connected to the working voltage, and outputs the self-locking signal to the switching module, so that the switching module maintains the self-locking state.

[0008] Further, the switching module includes a switching circuit and an isolation circuit, the input end of the switching circuit is connected with the output end of the isolation circuit.

[0009] Further, the isolation circuit is connected to the excitation signal, and the excitation signal is isolated and processed, and the isolated signal obtained by isolation is output to the switching circuit.

[0010] Further, the isolation circuit is connected to the self-locking signal, and the self-locking signal is isolated and processed, and the isolated signal obtained by isolation is output to the switching circuit.

[0011] Further, the self-locking control module comprises a control circuit and a self-locking circuit, an output end of the control circuit is connected with an input end of the self-locking circuit;

[0012] The control circuit outputs a control signal to the self-locking circuit, so that the self-locking circuit outputs the self-locking signal to the switch module.

[0013] Further, the control circuit comprises an MCU master controller, an input end of the MCU master controller is connected with the excitation signal, and the MCU master controller outputs the control signal according to the excitation signal.

[0014] Further, the control signal comprises a first control signal, a second control signal and a third control signal.

[0015] The first control signal is used for setting the self-locking signal to a low level.

[0016] The second control signal is used for setting the self-locking signal to a low level and setting an output end of the MCU master controller to a high resistance state.

[0017] The third control signal is used for setting the self-locking signal to a high resistance state.

[0018] Further, the switch module comprises a first switch tube, a first current-limiting element, a first isolation element and a second isolation element, an input end of the first switch tube is connected with the power supply, the first current-limiting element is connected in parallel between an input end and a control end of the first switch tube, and an output end of the first switch tube is connected with the working voltage; the control end of the first switch tube is connected with the excitation signal through the first isolation element, and the control end of the first switch tube is connected with the self-locking signal through the second isolation element.

[0019] Further, the self-locking control module comprises an MCU master controller, a second current-limiting element, a third current-limiting element, a second switch tube and a third switch tube, a control end of the second switch tube is connected with an IO port of the MCU master controller through the second current-limiting element, the control end of the second switch tube is connected with an output end of the third switch tube, an input end of the second switch tube is connected with a control end of the third switch tube, an output end of the second switch tube is grounded, and an input end of the third switch tube is connected with the switch module through the third current-limiting element.

[0020] In the above technical solution, the power self-locking power supply circuit and the electronic device have the following beneficial effects:

[0021] In the above technical solution, the power self-locking power supply circuit and the electronic device have the following beneficial effects:

[0022] 1. This utility model, by setting a self-locking circuit to maintain the self-locking power supply, effectively realizes the continuous output level of the I / O port without the need for the MCU main controller, and can enter a high impedance state or sleep mode, reducing the power consumption of the microcontroller control circuit during operation and further extending the service life of the power supply.

[0023] 2. This utility model effectively prevents mutual interference between excitation signals and self-locking signals by setting up an isolation circuit, thereby improving the stability and reliability of the circuit.

[0024] 3. This utility model, by setting the MCU master controller to output different control signals (such as low level, high level, high impedance state, etc.) according to the excitation signal, effectively realizes dynamic regulation of the self-locking signal and flexibly switches the state of the power supply circuit (such as power off, self-locking power supply, low power consumption, etc.). Attached Figure Description

[0025] Figure 1 A system block diagram of a self-locking power supply circuit provided in an embodiment of this utility model;

[0026] Figure 2 A connection block diagram of the switch module and related circuits provided in the embodiments of this utility model;

[0027] Figure 3 Connection block diagram of the self-locking control module and related circuits provided in the embodiments of this utility model;

[0028] Figure 4 The circuit diagram of the self-locking power supply circuit provided in the embodiment of this utility model.

[0029] Figure label:

[0030] 100. Power supply self-locking circuit; 110. Switching module; 120. Self-locking control module; 130. Excitation signal; 140. Power supply; 111. Isolation circuit; 112. Switching circuit; 121. Control circuit; 122. Self-locking circuit; 141. Working voltage. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, this utility model embodiment provides a power supply self-locking circuit 100, including a switch module 110 and a self-locking control module 120. The output terminal of the self-locking control module 120 is connected to the input terminal of the switch module 110, and the output terminal of the switch module 110 is connected to the input terminal of the self-locking control module 120.

[0033] Through the above design, the working principle of the power self-locking power supply circuit 100 is that the switch module 110 is connected to the power supply 140, the excitation signal 130 is input to the switch module 110, so that the switch module 110 outputs the working voltage 141 to the self-locking control module 120. The self-locking control module 120 is connected to the working voltage 141, and outputs the self-locking signal to the switch module 110, so that the switch module 110 maintains the self-locking state, realizes that the single-chip microcomputer does not need to continuously output a level, reduces the power consumption of the single-chip microcomputer, and prolongs the service life of the power supply to the electronic device.

[0034] Optionally, the excitation signal can be various, which can be a key trigger signal or an edge trigger signal. In the embodiment, the excitation signal is selected as a key trigger signal.

[0035] Optionally, the power supply can be various, which can be a battery or a stabilized direct-current power supply.

[0036] In combination Figure 2 As shown in the embodiment, the switch module 110 includes a switch circuit 112 and an isolation circuit 111.

[0037] Further, in the embodiment, the input end of the switch circuit 112 is connected to the output end of the isolation circuit 111.

[0038] Further, the isolation circuit 111 is connected to the excitation signal 130, performs isolation processing on the excitation signal 130, and outputs the isolated signal obtained by isolation to the switch circuit 112.

[0039] Further, the isolation circuit 111 is connected to the self-locking signal, performs isolation processing on the self-locking signal, and outputs the isolated signal obtained by isolation to the switch circuit 112.

[0040] According to actual circuit requirements, the isolation circuit 111 can process different signals (excitation signal or self-locking signal) respectively. Through the design of the isolation circuit 111, it is ensured that the excitation signal 130 and the self-locking signal output by the self-locking control module 120 do not affect each other, thereby improving the stability and reliability of the power supply circuit and ensuring the stable work of the switch module 110.

[0041] In combination Figure 3 As shown in the embodiment, the self-locking control module 120 includes a control circuit 121 and a self-locking circuit 122, and the output end of the control circuit 121 is connected to the input end of the self-locking circuit 122.

[0042] Further, the control circuit 121 outputs a control signal to the self-locking circuit 122, so that the self-locking circuit 122 outputs the self-locking signal to the switch module 110.

[0043] Further, the control circuit 121 comprises an MCU master, an input end of the MCU master being connected to the excitation signal 130, and the MCU master outputting the control signal according to the excitation signal 130.

[0044] Further, the control signal comprises a first control signal, a second control signal and a third control signal, the first control signal being used to set the self-locking signal to a low level, the second control signal being used to set the self-locking signal to a low level and set an output end of the MCU master to a high resistance state, and the third control signal being used to set the self-locking signal to a high resistance state.

[0045] By arranging the MCU master in the self-locking control module 120, the MCU master can output different control signals (such as low level, high level and high resistance state) according to the excitation signal 130, so as to effectively realize dynamic regulation of the self-locking signal and flexibly switch the state (such as power-off, self-locking power supply and low power consumption) of the power supply circuit. When the circuit maintains the self-locking power supply state, the current path of the MCU is disconnected, the MCU enters low power consumption, and the micro power consumption of the MCU during operation is further reduced.

[0046] In combination with Figure 4 As shown in the figure, in the embodiment, the switch module 110 comprises a first switch tube Q1, a first current-limiting element R1, a first isolation element D1 and a second isolation element D2.

[0047] Further, an input end of the first switch tube Q1 is connected to the power supply 140, the first current-limiting element R1 is connected in parallel between the input end and a control end of the first switch tube Q1, an output end of the first switch tube Q1 is connected to the working voltage 141, the control end of the first switch tube Q1 is connected to the excitation signal 130 through the first isolation element D1, and the control end of the first switch tube Q1 is connected to the self-locking signal through the second isolation element D2.

[0048] Optionally, the first switch tube Q1 can be multiple, which can be a MOS tube or a triode, the first current-limiting element R1 is a resistor, and the first isolation element D1 and the second isolation element D2 can be multiple, which can be an optical coupler or a diode.

[0049] In the embodiment, the first switch tube Q1 is selected as a P-channel MOSFET tube, and the first isolation element D1 and the second isolation element D2 are both selected as diodes.

[0050] Further, the self-locking control module 120 comprises an MCU host, a second current limiting element R2, a third current limiting element R3, a second switch tube Q2 and a third switch tube Q3.

[0051] Further, the control end of the second switch tube Q2 is connected with the IO port of the MCU host through the second current limiting element R2, the control end of the second switch tube Q2 is connected with the output end of the third switch tube Q3, the input end of the second switch tube Q2 is connected with the control end of the third switch tube Q3, the output end of the second switch tube Q2 is grounded, and the input end of the third switch tube Q3 is connected with the switch module 110 through the third current limiting element R3.

[0052] Optionally, the MCU host is a single-chip microcomputer, the second switch tube Q2 and the third switch tube Q3 can be multiple, which can be MOS tubes or triodes, and the second current limiting element R2 and the third current limiting element R3 are resistors respectively.

[0053] In the embodiment, the second switch tube Q2 is selected as a PNP triode, and the third switch tube Q3 is selected as an NPN triode.

[0054] Specifically, in the embodiment, one end of the hardware circuit button K1 is grounded, and the other end is connected with the cathode of the diode D1 and connected with the I / O port of the MCU host through the diode D3 respectively, and the source S of the P-channel MOSFET tube Q1 is connected with the power supply VIN. When it is needed to turn on the power supply to make the power supply circuit work, the button K1 is pressed, so that the gate G of the P-channel MOSFET tube Q1 becomes low, and when the gate-source voltage difference is greater than the threshold voltage (i.e. VGS>Vth), the source S and the drain D of the P-channel MOSFET tube Q1 are turned on, so that the current flows from the power supply VIN to the drain D of the P-channel MOSFET tube Q1, and the power supply circuit outputs the working voltage VDD, and the system is powered on.

[0055] After the system works, the MCU host detects the level signal of the other end of the button K1 through the I / O port, and waits for the release of the button K1. When the button K1 is released, the level signal of the other end becomes high, the MCU host outputs high level to the base B of the NPN triode Q3 through another I / O, then Q3 is turned on, and the collector C becomes low, so that the PNP triode Q2 is turned on, and the collector C becomes high, thereby maintaining the conduction of the P-channel MOSFET tube Q1, and realizing the self-locking power supply of the power supply.

[0056] When it is needed to make the power supply circuit from the working mode into the low power consumption mode, the key K1 is pressed again, at this time, the I / O port of the MCU master controller for detecting the key state detects that the key signal is low, then after the key K1 is released, the I / O port of the MCU master controller for outputting state is set to high resistance state, the current path of the I / O port of the MCU master controller is disconnected, the MCU master controller enters the low power consumption, and the micro power loss of the MCU master controller in working is further reduced.

[0057] When it is needed to make the power supply circuit from the low power consumption mode into the power-off mode, the key K1 is pressed again, at this time, the I / O port of the MCU master controller for detecting the key state detects that the key signal is low, then after the key K1 is released, the I / O port of the MCU master controller for outputting state is set to low, and low is output to the base B of the NPN triode Q3, then Q3 is cut off, the collector C becomes high resistance state, the PNP triode Q2 is cut off, the collector C becomes high resistance state, the P-channel MOSFET tube Q1 is cut off, and high resistance state is formed between the source S and the drain D, so that the current cannot pass, the power-off of the power supply circuit is realized, and the zero power consumption standby is realized.

[0058] In the embodiment, the self-locking power supply of the power supply is maintained through the self-locking loop, the MCU master controller I / O port continuous output level is not needed, the high resistance state or the sleep mode can be entered, the power consumption of the single-chip microcomputer control circuit in working is reduced, and the service life of the power supply is further prolonged. The excitation signal and the self-locking signal are isolated through the isolation circuit, the signal mutual interference is effectively prevented, and the stability and reliability of the circuit are improved. The MCU master controller outputs different control signals (such as low, high, high resistance state, etc.) according to the excitation signal, the dynamic regulation and control of the self-locking signal are effectively realized, and the state (such as power-off, self-locking power supply, low power consumption, etc.) of the power supply circuit is flexibly switched.

[0059] The above only describes some exemplary embodiments of the utility model in a descriptive manner, without doubt, for ordinary skilled in the art, under the condition that the spirit and scope of the utility model are not deviated, the described embodiments can be modified in various different ways. Therefore, the above drawings and description are illustrative in nature, and should not be understood as the limitation of the protection scope of the utility model claims.

Claims

1. A power supply self-locking circuit, characterized in that, It includes a switch module and a self-locking control module, wherein the output terminal of the self-locking control module is connected to the input terminal of the switch module, and the output terminal of the switch module is connected to the input terminal of the self-locking control module; The switching module is connected to a power supply, and an excitation signal is input to the switching module so that the switching module outputs a working voltage to the self-locking control module; The self-locking control module is connected to the operating voltage and outputs a self-locking signal to the switching module so that the switching module maintains a self-locking state.

2. The power supply self-locking circuit according to claim 1, characterized in that, The switching module includes a switching circuit and an isolation circuit, with the input terminal of the switching circuit connected to the output terminal of the isolation circuit.

3. The power supply self-locking circuit according to claim 2, characterized in that, The isolation circuit receives the excitation signal, performs isolation processing on the excitation signal, and outputs the isolated signal to the switching circuit.

4. The power supply self-locking circuit according to claim 2, characterized in that, The isolation circuit receives the self-locking signal, performs isolation processing on the self-locking signal, and outputs the isolated signal to the switching circuit.

5. The power supply self-locking circuit according to claim 1, characterized in that, The self-locking control module includes a control circuit and a self-locking circuit, wherein the output terminal of the control circuit is connected to the input terminal of the self-locking circuit; The control circuit outputs a control signal to the self-locking circuit, so that the self-locking circuit outputs the self-locking signal to the switching module.

6. The power supply self-locking circuit according to claim 5, characterized in that, The control circuit includes an MCU main controller, the input terminal of which is connected to the excitation signal, and the control signal is output according to the excitation signal.

7. The power supply self-locking circuit according to claim 6, characterized in that, The control signals include a first control signal, a second control signal, and a third control signal; The first control signal is used to set the self-locking signal to a low level; The second control signal is used to set the self-locking signal to a low level and set the output of the MCU main controller to a high impedance state; The third control signal is used to set the self-locking signal to a high-impedance state.

8. The power supply self-locking circuit according to claim 1, characterized in that, The switching module includes a first switching transistor, a first current limiting element, a first isolation element, and a second isolation element. The input terminal of the first switching transistor is connected to the power supply. The first current limiting element is connected in parallel between the input terminal and the control terminal of the first switching transistor. The output terminal of the first switching transistor is connected to the operating voltage. The control terminal of the first switching transistor is connected to the excitation signal through the first isolation element, and the control terminal of the first switching transistor is connected to the self-locking signal through the second isolation element.

9. The power supply self-locking circuit according to claim 1, characterized in that, The self-locking control module includes an MCU main controller, a second current limiting element, a third current limiting element, a second switching transistor, and a third switching transistor. The control terminal of the second switching transistor is connected to the I / O port of the MCU main controller through the second current limiting element. The control terminal of the second switching transistor is connected to the output terminal of the third switching transistor. The input terminal of the second switching transistor is connected to the control terminal of the third switching transistor. The output terminal of the second switching transistor is grounded. The input terminal of the third switching transistor is connected to the switching module through the third current limiting element.

10. An electronic device, characterized in that, The electronic device includes the power supply self-locking circuit according to any one of claims 1 to 9.

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