CN108919728B - Control circuit - Google Patents
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- CN108919728B CN108919728B CN201810966841.6A CN201810966841A CN108919728B CN 108919728 B CN108919728 B CN 108919728B CN 201810966841 A CN201810966841 A CN 201810966841A CN 108919728 B CN108919728 B CN 108919728B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
The embodiment of the invention relates to the technical field of power supply of controllers, in particular to a control circuit. The control circuit includes: a controller; the input end of the first switch circuit is connected with the power supply, the output end of the first switch circuit is connected with the power supply end of the controller, and the control end of the first switch circuit is connected with the input control end; the input end of the second switch circuit is connected with the power supply, the output end of the second switch circuit is connected with the control end of the first switch circuit, and the control end of the second switch circuit is connected with the control end of the controller; the control circuit can maintain the connection between the controller and the power supply when the controller works, when the power is required to be cut off, the controller outputs a control level to cut off the power supply line of the power supply, the controller can be maintained not to be connected with the power supply, when the power is required to be supplied again, the input control end opens the power supply line of the power supply at the input high level, and the power supply can be maintained to supply power for the power supply, so that the problems that the controller cannot be self-locked and restarted after the power of the controller is closed are solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supply of controllers, in particular to a control circuit.
Background
With the rapid development of science and technology and national economy, the state now puts forward higher energy-saving requirements on electric products, and in order to achieve the energy-saving goal, the electric products need to be made as lower power consumption as possible in a standby mode, and all circuits in a non-working state need to be powered off in the standby mode, wherein the power supply comprises a controller.
The inventors of the present invention have found that the following problems exist in the prior art in the process of implementing the present invention: in the prior art, when the power supply of the controller is turned off, a contradiction occurs, because the controller performs circuit switching control by outputting high and low levels, if the power supply of the controller is turned off by outputting low levels, after the power supply is turned off, the controller continuously outputs low levels to cause the power supply to be unable to be started, and if the power supply is turned off by outputting high levels, the power supply is unable to be kept off continuously after the power supply of the controller is turned off.
Disclosure of Invention
The technical problem which is mainly solved by the embodiment of the invention is to provide a control circuit, which aims to solve the problem that a controller can turn off a power supply of the controller.
In order to solve the technical problems, one technical scheme adopted by the embodiment of the invention is as follows: there is provided a control circuit including:
a controller;
the input end of the first switch circuit is connected with a power supply, the output end of the first switch circuit is connected with the power supply end of the controller, and the control end of the first switch circuit is connected with the input control end;
the input end of the second switching circuit is connected with the power supply, the output end of the second switching circuit is connected with the control end of the first switching circuit, and the control end of the second switching circuit is connected with the control end of the controller;
when the controller is in a working mode, the first switch circuit is turned on, the second switch circuit is turned off, and the power supply continuously supplies power to the controller through the first switch circuit; when the controller needs to turn off the power supply, the control end of the controller acts the output control level on the control end of the second switching circuit to enable the second switching circuit to be turned on, and then acts on the control end of the first switching circuit to enable the first switching circuit to be turned off so as to close the connection between the controller and the power supply; under the condition that the controller needs to be restarted, the input control end acts the input high level on the control end of the first switch circuit to enable the first switch circuit to be conducted, and then the power supply supplies power for the controller through the first switch circuit.
Optionally, the first switch circuit includes a first voltage division circuit, a second voltage division circuit, a third voltage division circuit, a fourth voltage division circuit, a fifth voltage division circuit, a first switch tube, a second switch tube and a first charging circuit;
the power supply is connected to one end of the first voltage dividing circuit, the other end of the first voltage dividing circuit is connected with one end of the second voltage dividing circuit, the other end of the second voltage dividing circuit is connected with one end of the first charging circuit and one end of the second switching tube respectively, the other end of the first charging circuit is grounded, the output end of the second switching tube is grounded, the input end of the first switching tube is connected with the power supply and one end of the third voltage dividing circuit respectively, the input end of the first switching tube is connected with the power supply and one end of the power supply of the controller respectively, the control end of the first switching tube is connected with the other end of the third voltage dividing circuit and one end of the fourth voltage dividing circuit respectively, the other end of the fourth voltage dividing circuit is connected with one end of the fifth voltage dividing circuit and one end of the second switching tube respectively, and the other end of the fifth voltage dividing circuit is connected with the control end of the controller and the control end of the second switching tube respectively.
Optionally, the second switching circuit includes a sixth voltage dividing circuit, a seventh voltage dividing circuit, a third switching tube and a second charging circuit;
the input end of the third switching tube is respectively connected with the other end of the first voltage dividing circuit and one end of the second voltage dividing circuit, the control end of the third switching tube is respectively connected with one end of the sixth voltage dividing circuit and one end of the seventh voltage dividing circuit, the other end of the sixth voltage dividing circuit is respectively connected with one end of the second charging circuit, the other end of the fifth voltage dividing circuit and the control end of the controller, and the output end of the third switching tube, the other end of the seventh voltage dividing circuit and the other end of the second charging circuit are all grounded.
Optionally, the first voltage dividing circuit is a first resistor, the second voltage dividing circuit is a second resistor, the third voltage dividing circuit is a third resistor, the fourth voltage dividing circuit is a fourth resistor, the fifth voltage dividing circuit is a fifth resistor, the sixth voltage dividing circuit is a sixth resistor, and the seventh voltage dividing circuit is a seventh resistor.
Optionally, the first charging circuit includes a first capacitor, one end of the first capacitor is connected with the control end of the second switch tube, the other end of the second voltage dividing circuit, and the input control end, and the other end of the first capacitor is grounded.
Optionally, the second charging circuit includes a second capacitor, one end of the second capacitor is connected to the other end of the sixth voltage dividing circuit, the other end of the fifth voltage dividing circuit, and the control end of the controller, and the other end of the second capacitor is grounded;
the capacitance value of the first capacitor is smaller than that of the second capacitor.
Optionally, the control circuit further includes a first diode, an input end of the first diode is connected with the input control end, and an output end of the first diode is connected with the other end of the second voltage dividing circuit, a control end of the second switching tube, and one end of the first capacitor respectively.
Optionally, the control circuit further includes a second diode, an input end of the second diode is connected to a control end of the controller, and an output end of the second diode is connected to the other end of the fifth voltage dividing circuit, the other end of the sixth voltage dividing circuit, and one end of the second capacitor, respectively.
Optionally, the first switching tube includes a first triode, the second switching tube includes a second triode, and the third switching tube includes a third triode.
Optionally, the first triode is a PNP triode, an input end of the first switch tube is an emitter of the first triode, an output end of the first switch tube is a collector of the first triode, and a control end of the first switch tube is a base of the first triode;
the second triode is an NPN triode, the input end of the second switching tube is an emitter of the second triode, the output end of the second switching tube is a collector of the second triode, and the control end of the second switching tube is a base of the second triode;
the third triode is an NPN triode, the input end of the third switching tube is the emitter of the third triode, the output end of the third switching tube is the collector of the third triode, and the control end of the third switching tube is the base of the third triode.
The beneficial effects of the embodiment of the invention are as follows: in an embodiment of the present invention, the control circuit includes: a controller; the input end of the first switch circuit is connected with a power supply, the output end of the first switch circuit is connected with the power supply end of the controller, and the control end of the first switch circuit is connected with the input control end; the input end of the second switching circuit is connected with the power supply, the output end of the second switching circuit is connected with the control end of the first switching circuit, and the control end of the second switching circuit is connected with the control end of the controller; when the controller is in a working mode, the first switch circuit is turned on, the second switch circuit is turned off, and the power supply continuously supplies power to the controller through the first switch circuit; under the condition that the controller needs to turn off a power supply, the control end of the controller acts an output control level on the control end of a second switching circuit to enable the second switching circuit to be conducted, and the second switching circuit acts on the control end of a first switching circuit to enable the first switching circuit to be turned off, so that the connection between the controller and the power supply is closed; under the condition that the controller needs to be restarted, the input control end acts the input high level on the control end of the first switch circuit to be conducted by the first switch circuit, so that the power supply supplies power to the controller through the first switch circuit. Therefore, the control circuit can maintain the connection between the controller and the power supply when the controller works, when the power is required to be cut off, the controller outputs the control level to cut off the power supply line of the power supply, the controller can be maintained not to be connected with the power supply, when the power is required to be supplied again, the input control end opens the power supply line of the power supply at the input high level, and the power supply can be maintained to supply power for the power supply, so that the problems that the controller cannot be self-locked and restarted after the power supply of the controller is closed are solved.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures do not depict a proportional limitation unless expressly stated otherwise.
FIG. 1 is a block diagram of a control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control circuit according to an embodiment of the invention;
fig. 3 is another schematic diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a control circuit 100 according to an embodiment of the present invention includes: a controller 10, a first switching circuit 20, and a second switching circuit 30.
The input end of the first switch circuit 20 is connected with the power supply vcc_in, the output end of the first switch circuit 20 is respectively connected with the power supply end and the power supply output end vcc_out of the controller 10, and the control end of the first switch circuit 20 is connected with the input control end wake_up; the input end of the second switch circuit 30 is connected with the power supply VCC_IN, the output end of the second switch circuit 30 is connected with the control end of the first switch circuit 20, and the control end of the second switch circuit 30 is connected with the control end of the controller 10; alternatively, the user may input a high level at the input control terminal wake_up by means of a key, a communication signal, a sensor trigger, or the like.
IN the embodiment of the present invention, when the controller 10 is IN the working mode, the first switch circuit 20 is turned on, the second switch circuit 30 is turned off, and the power supply vcc_in continuously supplies power to the controller 10 through the first switch circuit 20; IN the case that the controller 10 needs to turn off the power supply, the control terminal of the controller 10 applies an output control level to the control terminal of the second switch circuit 30 to turn on the second switch circuit 30, and the second switch circuit 30 further applies to the control terminal of the first switch circuit 20 to turn off the first switch circuit 20, so as to turn off the connection between the controller 10 and the power supply vcc_in, and optionally, the control level is a high level; when the controller 10 needs to be turned on again, the input control terminal wake_up applies an input high level to the control terminal of the first switch circuit 20 to turn on the first switch circuit 20, so that the power supply vcc_in supplies power to the controller 10 through the first switch circuit 20.
Specifically, the first switching circuit 20 includes a first voltage dividing circuit 21, a second voltage dividing circuit 22, a third voltage dividing circuit 23, a fourth voltage dividing circuit 24, a fifth voltage dividing circuit 25, a first switching tube 26, a second switching tube 27, and a first charging circuit 28; one end of the first voltage dividing circuit 21 is connected with a power supply vcc_in, the other end of the first voltage dividing circuit 21 is connected with one end of the second voltage dividing circuit 22, the other end of the second voltage dividing circuit 22 is connected with one end of the first charging circuit 28 and the control end of the second switching tube 27 respectively, the other end of the first charging circuit 28 is grounded GND, the output end of the second switching tube 27 is grounded GND, the input end of the first switching tube 26 is connected with the power supply vcc_in and one end of the third voltage dividing circuit 23 respectively, the input end of the first switching tube 26 is connected with the power supply end and the power supply output end of the controller 10 respectively, the control end of the first switching tube 26 is connected with the other end of the third voltage dividing circuit 23 and one end of the fourth voltage dividing circuit 24 respectively, the other end of the fourth voltage dividing circuit 24 is connected with one end of the fifth voltage dividing circuit 25 and the input end of the second switching tube 27 respectively, and the other end of the fifth voltage dividing circuit 25 is connected with the control end of the controller 10 and the control end of the second switching tube 30 respectively.
The second switching circuit 30 includes a sixth voltage dividing circuit 31, a seventh voltage dividing circuit 32, a third switching tube 33, and a second charging circuit 34; the input end of the third switching tube 33 is connected with the other end of the first voltage dividing circuit 21 and one end of the second voltage dividing circuit 22 respectively, the control end of the third switching tube 33 is connected with one end of the sixth voltage dividing circuit 31 and one end of the seventh voltage dividing circuit 32 respectively, the other end of the sixth voltage dividing circuit 31 is connected with one end of the second charging circuit 34, the other end of the fifth voltage dividing circuit 25 and the control end of the controller 10 respectively, and the output end of the third switching tube 33, the other end of the seventh voltage dividing circuit 32 and the other end of the second charging circuit 34 are all grounded to GND.
In the embodiment of the present invention, the first voltage dividing circuit 21 is a first resistor R1, the second voltage dividing circuit 22 is a second resistor R2, the third voltage dividing circuit 23 is a third resistor R3, the fourth voltage dividing circuit 24 is a fourth resistor R4, the fifth voltage dividing circuit 25 is a fifth resistor R5, the sixth voltage dividing circuit 31 is a sixth resistor R6, and the seventh voltage dividing circuit 32 is a seventh resistor R7. Optionally, the resistance of the first resistor R1 is 33 kilo ohms, the resistance of the second resistor R2 is 10 kilo ohms, the resistance of the third resistor R3 is 0.56 kilo ohms, the resistance of the fourth resistor R4 is 1.8 kilo ohms, the resistance of the fifth resistor R5 is 33 kilo ohms, the resistance of the sixth resistor R6 is 10 kilo ohms, and the resistance of the seventh resistor R7 is 4.7 kilo ohms.
Further, the first charging circuit 28 includes a first capacitor C1, one end of the first capacitor C1 is connected to the control end of the second switching tube 27, the other end of the second voltage dividing circuit 22, and the input control end wake_up, and the other end of the first capacitor C1 is grounded GND. The second charging circuit 34 includes a second capacitor C2, one end of the second capacitor C2 is connected to the other end of the sixth voltage dividing circuit 31, the other end of the fifth voltage dividing circuit 25, and the control end of the controller 10, and the other end of the second capacitor C2 is grounded to GND; the capacitance value of the first capacitor C1 is smaller than the capacitance value of the second capacitor C2, and optionally, the capacitance value of the first capacitor C1 is equal to 0.1UF, and the capacitance value of the second capacitor C2 is equal to 1UF.
In the embodiment of the present invention, the control circuit 100 further includes a first diode D1 and a second diode D2, wherein an input terminal of the first diode D1 is connected to the input control terminal wake_up, and an output terminal of the first diode D1 is connected to the other end of the second voltage dividing circuit 22, the control terminal of the second switching tube 27, and one end of the first capacitor C1, respectively. The input end of the second diode D2 is connected to the control end of the controller 10, and the output end of the second diode D2 is connected to the other end of the fifth voltage dividing circuit 25, the other end of the sixth voltage dividing circuit 31, and one end of the second capacitor C2, respectively.
Further, the first switching transistor 26 includes a first transistor Q1, the second switching transistor 27 includes a second transistor Q2, and the third switching transistor 33 includes a third transistor Q3. The first triode Q1 is a PNP triode, the input end of the first switching tube 26 is an emitter of the first triode Q1, the output end of the first switching tube 26 is a collector of the first triode Q1, and the control end of the first switching tube 26 is a base of the first triode Q1; the second triode Q2 is an NPN triode, the input end of the second switch tube 27 is an emitter of the second triode Q2, the output end of the second switch tube 27 is a collector of the second triode Q2, and the control end of the second switch tube 27 is a base of the second triode Q2; the third triode Q3 is an NPN triode, the input end of the third switching tube 33 is an emitter of the third triode Q3, the output end of the third switching tube 33 is a collector of the third triode Q3, and the control end of the third switching tube 33 is a base of the third triode Q3. Optionally, the controller 10 comprises a microprocessor unit.
In order to better explain the working principle of the embodiment of the present invention, the following three cases are further described:
first case: when the control circuit 100 is connected with the power supply vcc_in for the first time, the power supply vcc_in charges the first capacitor C1 through the first resistor R1 and the second resistor R2, and charges the second capacitor C2 through the third resistor R3, the fourth resistor R4 and the fifth resistor R5 at the same time, because the capacitance value of the first capacitor C1 is smaller than that of the second capacitor C2, the potential at two ends of the first capacitor C1 rises faster than that at two ends of the second capacitor C2, so that the second switching tube IN the second switching circuit 30 is turned on faster than that of the third switching tube IN the third switching circuit 40, once the second switching tube IN the second switching circuit 30 is turned on, the potential between the fourth resistor R4 and the fifth resistor R5 is pulled down, and the power supply vcc_in does not charge the second capacitor C2 through the third resistor R3, the fourth resistor R4 and the fifth resistor R5, and conversely, the second capacitor C2 is kept IN a state by the seventh resistor R6 and the third switching tube, and the third switching tube IN keeps the state, and the third switching tube IN the state is kept IN which the third switching tube is turned off, and the third switching tube IN the state is kept IN which the state, and the potential of the third switching tube is turned off, and the third switching tube IN the state is kept IN which the state.
Second case: when the controller 10 determines that the standby power-off mode needs to be entered, the first switch circuit 20 needs to be turned off to turn off the power supply of the controller 10, so as to save power, specifically as follows: the controller 10 outputs a high level through its own control terminal, alternatively, the control terminal of the controller 10 may be a STANDBY port, the high level charges the second capacitor C2 after passing through the first diode D1, when the second capacitor C2 is full, the potential of the control terminal of the third switch circuit 40 is pulled up, the third switch tube IN the third switch circuit 40 will be turned on, and then the potential between the first resistor R1 and the second resistor R2 is pulled down, so that the first capacitor C1 starts to discharge to pull down the potential of the control terminal of the second switch circuit 30, the second switch tube IN the second switch circuit 30 will be turned off, and then the first switch tube of the first switch circuit 20 is turned off, and then the power supply of the controller 10 is turned off, at this time, the control terminal of the controller 10 will output a low level, and the power supply vcc_in will be provided with a bias potential through the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 for the third switch tube IN the third switch circuit 40, so as to maintain the third switch tube IN the third switch circuit 30 to be turned on, and the second switch tube IN the second switch circuit 30 is turned off, and the controller 10 is kept IN the STANDBY state when the first switch tube is turned off, and the controller 10 is kept IN the STANDBY state.
Third case: when the controller 10 needs to be turned on again, the first switching tube needs to be turned on again, and the controller 10 is IN the off state, that is, the power supply vcc_in does not supply power to the controller 10, specifically as follows: the external side inputs a high level through the input control terminal wake_up, the high level charges the first capacitor C1 after passing through the first diode D1, when the first capacitor C1 is charged, the high level acts on the control terminal of the second switch circuit 30, that is, acts on the base of the second switch circuit, so that the second switch circuit 30 is turned on, since the electric potential between the fourth resistor R4 and the fifth resistor R5 is pulled down after the second switch circuit 30 is turned on, the electric potentials of the control terminals of the first switch circuit 20 and the third switch circuit 40 are both pulled down, since the first switch circuit 20 is a PNP triode, the third switch circuit 40 is an NPN triode, the electric potential of the base of the first switch tube of the first switch circuit 20 is lower than the electric potential of the emitter, so that the first switch tube is turned on, that is, the first switch circuit 20 is turned on, and at this time, the power supply source_in is connected to the power supply terminal of the controller 10 and enters the first condition, and the electric potential of the base and the electric potential of the third switch tube IN the third switch circuit 40 are both pulled down, and the electric potential of the base of the third switch tube and the emitter of the third switch circuit 40 are turned off, that is, the third switch circuit 40 enters the normal state. Alternatively, the user may input a high level at the input control terminal wake_up by means of a key, a communication signal, a sensor trigger, or the like.
Noteworthy are: in the embodiment of the present invention, the control circuit 100 mainly solves the control states of the above three cases, specifically as follows: first, after the power supply vcc_in is connected, the power supply vcc_in can be maintained to supply power to the controller 10. Second, the controller 10 may turn off its own power supply and maintain the off state. Third, the outside world can turn on the controller 10 again when the controller 10 is turned off, and the controller 10 is maintained in the on state when the controller 10 is turned off, so as to continuously supply power to the controller 10. In the control state for realizing the three conditions, the embodiment of the invention adopts a cross locking switch state between the second switching tube and the third switching tube, any one of the second switching tube and the third switching tube is turned on to turn off the other, and at the same time, any one of the second switching tube and the third switching tube is turned off to turn on the other, and each resistor, each resistor and each diode are added in the circuit to cooperate with the realization of the embodiment of the invention, wherein each capacitor also has the functions of stabilizing the state and eliminating interference.
In an embodiment of the present invention, the control circuit 100 includes: a controller 10; the input end of the first switch circuit 20 is connected with the power supply VCC_IN, the output end of the first switch circuit 20 is connected with the power supply end of the controller 10, and the control end of the first switch circuit 20 is connected with the input control end WAKE_UP; the input end of the second switch circuit 30 is connected with the power supply VCC_IN, the output end of the second switch circuit 30 is connected with the control end of the first switch circuit 20, and the control end of the second switch circuit 30 is connected with the control end of the controller 10; when the controller 10 is IN the working mode, the first switch circuit 20 is turned on, the second switch circuit 30 is turned off, and the power supply vcc_in continuously supplies power to the controller 10 through the first switch circuit 20; when the controller 10 needs to turn off the power supply, the control end of the controller 10 applies the output control level to the control end of the second switch circuit 30 to turn on the second switch circuit 30, and the second switch circuit 30 further applies to the control end of the first switch circuit 20 to turn off the first switch circuit 20, so as to turn off the connection between the controller 10 and the power supply vcc_in; when the controller 10 needs to be turned on again, the input control terminal wake_up applies an input high level to the control terminal of the first switch circuit 20 to turn on the first switch circuit 20, so that the power supply vcc_in supplies power to the controller 10 through the first switch circuit 20. Therefore, the controller 10 can maintain the power supply to supply power after being connected with the power supply vcc_in, when the power needs to be cut off, the controller 10 outputs a high level to turn off the power supply line of the power supply vcc_in, and can maintain the power supply vcc_in to stop supplying power to the power supply vcc_in, when the power needs to be supplied again, the input control end wake_up turns on the power supply line of the power supply vcc_in at the input high level, and can maintain the power supply vcc_in to supply power to the power supply vcc_in, so that the problems that the controller 10 cannot be self-locked and turned on again after turning off the power supply of the controller are solved.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (6)
1. A control circuit, comprising:
a controller;
the input end of the first switch circuit is connected with a power supply, the output end of the first switch circuit is connected with the power supply end of the controller, and the control end of the first switch circuit is connected with the input control end;
the input end of the second switching circuit is connected with the power supply, the output end of the second switching circuit is connected with the control end of the first switching circuit, and the control end of the second switching circuit is connected with the control end of the controller;
the first switch circuit comprises a first voltage division circuit, a second voltage division circuit, a third voltage division circuit, a fourth voltage division circuit, a fifth voltage division circuit, a first switch tube, a second switch tube and a first capacitor;
one end of the first voltage dividing circuit is connected with the power supply, the other end of the first voltage dividing circuit is connected with one end of the second voltage dividing circuit, the other end of the second voltage dividing circuit is connected with one end of the first capacitor and the control end of the second switching tube respectively, the other end of the first capacitor is grounded, the output end of the second switching tube is grounded, the input end of the first switching tube is connected with the power supply and one end of the third voltage dividing circuit respectively, the output end of the first switching tube is connected with the power supply and one end of the power supply of the controller respectively, the control end of the first switching tube is connected with the other end of the third voltage dividing circuit and one end of the fourth voltage dividing circuit respectively, the other end of the fourth voltage dividing circuit is connected with one end of the fifth voltage dividing circuit and the input end of the second switching tube respectively, the other end of the fifth voltage dividing circuit is connected with the control end of the controller and the control end of the second switching tube respectively, and the first capacitor is also connected with the control end of the second switching tube;
the second switching circuit comprises a sixth voltage dividing circuit, a seventh voltage dividing circuit, a third switching tube and a second capacitor;
the input end of the third switching tube is respectively connected with the other end of the first voltage dividing circuit and one end of the second voltage dividing circuit, the control end of the third switching tube is respectively connected with one end of the sixth voltage dividing circuit and one end of the seventh voltage dividing circuit, the other end of the sixth voltage dividing circuit is respectively connected with one end of the second capacitor, the other end of the fifth voltage dividing circuit and the control end of the controller, and the output end of the third switching tube, the other end of the seventh voltage dividing circuit and the other end of the second capacitor are all grounded; one end of the second capacitor is respectively connected with the other end of the sixth voltage dividing circuit, the other end of the fifth voltage dividing circuit and the control end of the controller, and the other end of the second capacitor is grounded;
the capacitance value of the first capacitor is smaller than that of the second capacitor;
when the controller is in a working mode, the first switch circuit is turned on, the second switch circuit is turned off, and the power supply continuously supplies power to the controller through the first switch circuit; when the controller needs to turn off the power supply, the control end of the controller acts the output control level on the control end of the second switching circuit to enable the second switching circuit to be turned on, and then acts on the control end of the first switching circuit to enable the first switching circuit to be turned off so as to close the connection between the controller and the power supply; under the condition that the controller needs to be restarted, the input control end acts the input high level on the control end of the first switch circuit to enable the first switch circuit to be conducted, and then the power supply supplies power for the controller through the first switch circuit.
2. The control circuit of claim 1, wherein,
the first voltage dividing circuit is a first resistor, the second voltage dividing circuit is a second resistor, the third voltage dividing circuit is a third resistor, the fourth voltage dividing circuit is a fourth resistor, the fifth voltage dividing circuit is a fifth resistor, the sixth voltage dividing circuit is a sixth resistor, and the seventh voltage dividing circuit is a seventh resistor.
3. The control circuit of claim 1, wherein,
the control circuit further comprises a first diode, the input end of the first diode is connected with the input control end, and the output end of the first diode is respectively connected with the other end of the second voltage dividing circuit, the control end of the second switching tube and one end of the first capacitor.
4. The control circuit of claim 3, wherein,
the control circuit further comprises a second diode, the input end of the second diode is connected with the control end of the controller, and the output end of the second diode is respectively connected with the other end of the fifth voltage dividing circuit, the other end of the sixth voltage dividing circuit and one end of the second capacitor.
5. The control circuit according to any one of claims 1, 3 and 4, wherein,
the first switching tube comprises a first triode, the second switching tube comprises a second triode, and the third switching tube comprises a third triode.
6. The control circuit of claim 5, wherein the control circuit comprises a logic circuit,
the first triode is a PNP triode, the input end of the first switch tube is an emitter of the first triode, the output end of the first switch tube is a collector of the first triode, and the control end of the first switch tube is a base of the first triode;
the second triode is an NPN triode, the input end of the second switching tube is a collector electrode of the second triode, the output end of the second switching tube is an emitter electrode of the second triode, and the control end of the second switching tube is a base electrode of the second triode;
the third triode is an NPN triode, the input end of the third switching tube is the collector electrode of the third triode, the output end of the third switching tube is the emitter electrode of the third triode, and the control end of the third switching tube is the base electrode of the third triode.
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