CN218383706U - Power switch control circuit - Google Patents
Power switch control circuit Download PDFInfo
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- CN218383706U CN218383706U CN202222320312.3U CN202222320312U CN218383706U CN 218383706 U CN218383706 U CN 218383706U CN 202222320312 U CN202222320312 U CN 202222320312U CN 218383706 U CN218383706 U CN 218383706U
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Abstract
The application relates to a power switch control circuit, which comprises a first voltage transformation module, a wake-up electronic switch module, a second voltage transformation module and an MCU (microprogrammed control unit); when the MCU and the second voltage transformation module are not electrified to work in a standby state, the whole circuit keeps a lower power consumption, when the awakening electronic switch module detects the awakening operation, the awakening electronic switch module is instantly conducted, and the MCU is electrified to start and control the awakening electronic switch module to keep a conducting state so as to continuously supply power to a load. Therefore, the whole power switch control circuit can realize low power consumption.
Description
Technical Field
The present application relates to the field of electronic circuit technology, and more particularly, to a power switch control circuit.
Background
In the prior art, the intelligent device basically adopts an MCU (micro controller Unit) to realize the startup and shutdown control.
In a power circuit of an intelligent device, a switching power supply or a linear power supply is generally adopted to rectify and output 12V power, and the 12V is stepped down to 5V through a DC-DC or LDO (Low Dropout Regulator) to supply power to an MCU or other 5V loads.
The intelligent equipment adopting the power supply circuit generally adopts a power plug, the switching power supply works, the 12V-to-5V circuit also works, and the MCU is powered. Therefore, the MCU consumes a part of electric energy in a standby mode, particularly in an LDO mode for converting 12V into 5V, so that the standby of the whole machine has larger power consumption, and the electric energy is wasted.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a power switch control circuit with low power consumption to solve the problem of power waste caused by large power consumption of the power circuit in the standby state of the conventional smart device.
The application provides a power switch control circuit, which comprises a first voltage transformation module, a wake-up electronic switch module, a second voltage transformation module and an MCU (microprogrammed control unit);
the first voltage transformation module receives an external voltage, reduces the external voltage to a first voltage, and outputs the first voltage to the awakening electronic switch module; when a wake-up operation is detected, the wake-up electronic switch module is instantly switched on and outputs the first voltage to the second voltage transformation module, and the second voltage transformation module reduces the first voltage to the rated voltage of the MCU and outputs the rated voltage of the MCU to the MCU; and the MCU is electrified to start and output a normally closed signal to the awakening electronic switch module so as to keep the awakening electronic switch module in a conducting state.
The power switch control circuit comprises a first voltage transformation module, a wake-up electronic switch module, a second voltage transformation module and an MCU (microprogrammed control unit); when the MCU and the second voltage transformation module are not electrified to work in a standby state, the whole circuit keeps a lower power consumption, when the awakening electronic switch module detects the awakening operation, the awakening electronic switch module is instantly conducted, and the MCU is electrified to start and control the awakening electronic switch module to keep a conducting state so as to continuously supply power to a load. Therefore, the whole power switch control circuit can realize low power consumption.
Drawings
FIG. 1 is a block diagram of a power switch control circuit according to one embodiment;
FIG. 2 is a block diagram of a power switch control circuit in another embodiment;
fig. 3 is a schematic circuit diagram of a power switch control circuit according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
As shown in fig. 1, the present application provides a power switch control circuit, which includes a first transforming module 100, a wake-up electronic switch module 200, a second transforming module 300, and an MCU400;
the first voltage transformation module 100 receives an external voltage, reduces the external voltage to a first voltage, and outputs the first voltage to the wake-up electronic switch module 200; when the wake-up operation is detected, the wake-up electronic switch module 200 is instantly turned on and outputs a first voltage to the second transforming module 300, and the second transforming module 300 reduces the first voltage to the MCU rated voltage and outputs the MCU rated voltage to the MCU400; the MCU400 is powered on to output a normally-closed signal to the wake-up electronic switch module 200, so that the wake-up electronic switch module 200 is kept in a conducting state.
The first voltage transformation module 100 receives an external voltage, steps down the external voltage to a first voltage, and then outputs the first voltage to the wake-up electronic switch module 200. The external voltage refers to a voltage inputted from the outside, and may be a relatively high voltage, for example, a 220V voltage of a conventional commercial power. The first voltage is a preset voltage set according to an application scenario, and may be specifically set according to a working voltage of the wake-up electronic switch module 200, for example, 12V voltage, that is, in practical application, the first voltage transformation module 100 may step down 220V of the mains supply to 12V for output.
The second voltage transformation module 300 is configured to step down the first voltage to an MCU rated voltage, and functions similar to the first voltage transformation module 100, where the MCU rated voltage may be 5V, that is, in practical applications, the second voltage transformation module 300 may step down a 12V voltage to a 5V voltage, and output the 5V voltage to the MCU400.
The wake-up electronic switch module 200 includes two conduction states of instant conduction and continuous conduction, at the initial standby time, the wake-up electronic switch module 200 is in the off state, and when the wake-up operation is detected, the wake-up electronic switch 240 is instantly conducted; when receiving the normally closed signal sent by the MCU400, the electronic switch module 200 is awakened to maintain the on state. The wake-up operation refers to an operation that a user needs to wake up a load, for example, the user needs to wake up (start) a home appliance, and the user may perform the wake-up operation by touching or pressing, for example, when the wake-up electronic switch module 200 is pressed, the wake-up electronic switch module 200 is instantly turned on when detecting the wake-up operation. Briefly, the wake-up electronic switch module 200 may be understood as including an instantaneous on switch and a normally closed on switch, and when the wake-up operation is detected, the instantaneous on switch is turned off after being instantaneously turned on, and the instantaneous on switch may be a resilient key switch, which is turned on when pressed and turned off after being released; and when the normally closed conducting switch receives a normally closed signal sent by the MCU400, the normally closed conducting state is kept.
When the electronic switch module 200 is awakened to be instantaneously turned on, the MCU400 is powered on and started, and the MCU400 outputs a normally-closed signal to the electronic switch module 200 to keep the electronic switch module 200 in a normally-closed conducting state.
The power switch control circuit comprises a first transformation module 100, a wake-up electronic switch module 200, a second transformation module 300 and an MCU400; when the MCU400 and the second voltage transformation module 300 are not powered on to operate in the standby state, the whole power circuit is completely idle in the standby state, the standby power consumption is only the idle power consumption of the power part, the whole circuit maintains a low power consumption, when the wake-up electronic switch module 200 detects the wake-up operation, the wake-up electronic switch module 200 is instantly turned on, and the MCU400 is powered on to control the wake-up electronic switch module 200 to maintain the on state and continuously supply power to the load. Therefore, the whole power switch control circuit can realize low power consumption.
As shown in FIG. 2, in one embodiment, wake-up electronic switch module 200 includes wake-up switch 220 and electronic switch 240;
the input end of the wake-up switch 220 is connected with the first voltage transformation module 100, and the output end of the wake-up switch 220 is connected with the second voltage transformation module 300; the input end of the electronic switch 240 is connected to the first transforming module 100, the output end of the electronic switch 240 is connected to the second transforming module 300, and the control end of the electronic switch 240 is connected to the MCU400.
In this embodiment, the wake-up electronic switch module 200 includes two switches, a wake-up switch 220 and an electronic switch 240, the wake-up switch 220 is turned on instantly when detecting the wake-up operation, so that the MCU400 is turned on instantly, and the MCU400 sends a normally-closed signal to the electronic switch 240 after being turned on to control the electronic switch 240 to keep a normally-closed conducting state. Briefly, the wake-up electronic switch 240 is a switch that is instantly turned on during a wake-up operation, such as a resilient button switch, and when a user presses a button, the wake-up electronic switch 240 is instantly turned on, and when the user releases his hand, the wake-up electronic switch 240 is turned off; the electronic switch 240 is a switch that is turned on and off under the control of the MCU400, and when the MCU400 does not output a normally closed signal, the electronic switch 240 maintains an off state; when the MCU400 sends a normally closed signal after power-on start, the electronic switch 240 is turned on and remains on. In this embodiment, the wake-up electronic switch module 200 includes two parts, namely a wake-up switch 220 and an electronic switch 240, the wake-up switch 220 is used for detecting the transient conduction of the wake-up operation, the electronic switch 240 is used for maintaining the conduction state under the control of the MCU400, and the transient conduction and the normally closed conduction are realized by using independent devices respectively, so as to ensure the independent operation between the devices, avoid the mutual influence, and realize the effective switch control.
In one embodiment, the wake-up electronic switch module comprises a first switch tube, a second switch tube and a key switch;
the input end of the first switch tube is connected with the first voltage transformation module, the output end of the first switch tube is connected with the second voltage transformation module, the control end of the first switch tube is connected with one end of the key switch, and the other end of the key switch is grounded; the input end of the second switching tube is connected with the control end of the first switching tube, the output end of the second switching tube is grounded, and the control end of the second switching tube is connected with the MCU; one end of the resistor is connected with the input end of the first switch tube.
The first switch tube and the second switch tube can be triodes or MOS tubes. When the key switch is pressed down, the first switch tube is conducted, the first voltage transformation module outputs a first voltage to the second voltage transformation module in a working mode, the second voltage transformation module outputs a rated voltage of the MCU to the MCU, the MCU is powered on and starts to output a control signal to the second switch tube, the second switch tube is conducted with the first switch tube, and the whole system works normally.
In this embodiment, awakening electronic switch is composed of a first switch tube, a second switch tube and a key switch, the first switch tube, the second switch tube and the key switch are all conventional devices, the cost is low, the performance is stable, and the awakening electronic switch is composed of the devices, so that the cost can be reduced while the reliability of the performance of the awakening electronic switch is ensured.
In one embodiment, the wake-up electronic switch module further includes a diode, an anode of the diode is connected to the control end of the first switch tube, and a cathode of the diode is connected to one end of the key switch.
In this embodiment, the wake-up electronic switch module further includes a diode, and the diode has a unidirectional conduction characteristic, so that mutual influence of currents between devices in actual application can be avoided, and stable operation of the whole circuit is ensured.
In one embodiment, the power switch control circuit further includes a filter component, and the MCU is connected to the control end of the second switch tube through the filter component.
The filtering component is used for filtering the control signal output by the MCU to form stable voltage so as to drive the second switch tube to be conducted. Specifically, the filter assembly comprises a filter resistor, a second capacitor, a second diode and a third capacitor, one end of the filter resistor is connected with the MCU, the other end of the filter resistor is connected with one end of the second capacitor, the other end of the second capacitor is connected with the anode of the second diode, the cathode of the second diode is connected with the control end of the second switch tube, and the third capacitor is connected with the second diode in parallel. In this embodiment, the control signal output by the MCU is filtered by the filtering component to form a stable voltage to drive the second switch tube to be stably turned on, thereby ensuring the stability of the whole power switch control circuit.
In one embodiment, the power switch control circuit further includes a load current detection module connected to the MCU;
the load current detection module detects a load current value, sends the load current value to the MCU, the MCU compares the load current value with a preset load current threshold value, and when the load current value is greater than the preset load current threshold value, the MCU stops outputting a normally-closed signal to the awakening electronic switch module so as to turn off the awakening electronic switch module.
In this embodiment, the power switch control circuit further includes a load current detection module, which is used for collecting a load current value, and sending the collected load current value to the MCU, wherein a load current threshold is prestored in the MCU, the MCU compares the load current value with a preset load current threshold, when the load current value is greater than the preset load current threshold, it indicates that the current on the current load is too large, if there is a potential safety hazard in the continuous operation, the MCU stops outputting a normally-closed signal to the wake-up electronic switch module, and the wake-up electronic switch module is turned off, that is, the load is powered off. Further, when the MCU determines that the load current is too large, it may send an alarm signal to prompt the user that the load current is too large, where the alarm signal may be a sound signal and/or a light signal.
In practical application, after the MCU is powered on, the MCU can detect the alternating current under the no-load condition, if the alternating current under the no-load condition is too large, the MCU stops outputting a normally closed signal to wake up the electronic switch module to be switched off, and the MCU is switched off when the power is off; when the load is in normal operation, the MCU acquires alternating current of a certain load, carries out overcurrent detection on the load, stops outputting a normally-closed signal to the awakening electronic switch module if the current of the load is detected to be overlarge, turns off the awakening electronic switch module, namely, cuts off the power of the load, and further sends out an alarm signal.
In one embodiment, the load current detection module comprises a current detection resistor and an operational amplifier comparator; the current detection resistor is connected with the load in series, the in-phase input end of the operational amplifier comparator is connected with one end of the current detection resistor, the reverse input end of the operational amplifier comparator is connected with the other end of the current detection resistor, and the output end of the operational amplifier comparator is connected with the MCU.
When the load works, current can flow through the current detection resistor connected with the load in series, a certain voltage drop is generated, the voltage drop is amplified after being sent to the operational amplifier comparator, the amplified voltage is input into the MCU, the MCU performs comparative analysis to determine the current condition on the load, if the current on the load is too large, the MCU stops outputting a normally closed signal to the awakening electronic switch module, and the awakening electronic switch module is turned off, namely, the load is powered off.
Further, the load current detection circuit further comprises a hysteresis comparator, the hysteresis comparator is connected with the operational amplifier comparator in series, the reverse input end of the specific hysteresis comparator is connected with the output end of the operational amplifier comparator, the non-inverting input end of the hysteresis comparator is connected with a preset reference voltage, the output end of the hysteresis comparator is connected between the MCU and the control end of the second switch tube, the hysteresis comparator compares the preset reference voltage with the amplified voltage output by the operational amplifier comparator, if the amplified voltage is overlarge, the hysteresis comparator outputs a low level, the voltage of the control end of the second switch tube is forcibly pulled down, and the second switch tube is turned off, so that the first switch tube is turned off, the MCU is powered down, and all loads are turned off.
In one embodiment, the MCU is configured to stop outputting the normally-closed signal to the wake-up electronic switch module when the self-detection is abnormal, so as to turn off the wake-up electronic switch module.
In this embodiment, the MCU further has a self-checking function, and when the MCU performs self-checking abnormally, the MCU stops outputting the normally-closed signal to the wake-up electronic switch module to turn off the wake-up electronic switch module, thereby ensuring the safety of the load. Self-test anomalies include, but are not limited to, a run away or a crash.
To explain the structure of the power switch control circuit and its operation in detail, an example will be used in conjunction with fig. 3. In a specific application example, the whole power switch control circuit includes a first voltage transformation circuit (not shown in fig. 3) that 220V changes to 12V, a first triode Q1, a second triode Q2, a first diode D1, a power key SW1, an MCU (embodied by pins in fig. 3), a second diode D2, a third diode DB1, a second voltage transformation circuit that 12V changes to 5V, a first capacitor C1, a second capacitor C2, a third capacitor C3, an operational amplifier comparator U2B, a hysteresis comparator U2A, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R3, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17;
the input end of a first triode Q1 is connected with a 220V-to-12V transformation circuit, the output end of the first triode Q1 is connected with the first transformation circuit, the Control end of the first triode Q1 is connected with the anode of a first diode D1 through an eighth resistor R8, the cathode of the first diode D1 is connected with a Power supply key SW1, the other end of the Power supply key SW1 is grounded, a second transformation circuit is connected with an MCU, the input end and the Control end of the first triode Q1 are connected with a fourth resistor R4, the Control end and the output end of a second triode Q2 are connected with a seventeenth resistor R17, the Control end of the second triode Q2 is connected with the cathode of a second diode D2 through a fifteenth resistor R15, the anode of the second diode D2 is connected with a second capacitor C2, and the second capacitor C2 is connected with a sixteenth resistor R16, a sixteenth resistor R16 is connected to a Power _ Control pin of the MCU to receive the 2KHz square wave output by the MCU, the sixth resistor R6 is connected in series with the load, one end of the sixth resistor R6 is connected to the non-inverting input terminal of the operational amplifier comparator U2B through a third resistor R3, the other end of the sixth resistor R6 is connected to the inverting input terminal of the operational amplifier comparator U2B through a seventh resistor R7, the output end section of the operational amplifier comparator U2B is connected to one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected to the Current Detect pin of the MCU and the inverting input terminal of the hysteresis comparator U2A, the non-inverting input terminal of the hysteresis comparator U2A is connected to a preset reference voltage, and the output terminal of the hysteresis comparator U2A is connected to the negative electrode of the third diode DB 1. The first triode Q1, the second triode Q2 and peripheral devices thereof form a wake-up switch; the first diode D21 and the power supply key SW1 form a key switch; and a load current detection circuit is formed by the sixth resistor R6, the third resistor R3, the seventh resistor R7, the operational amplifier comparator U2B and the hysteresis comparator U2A.
Under a normal working state, when a load does not work at the initial moment, the first triode Q1 is not conducted, the +12V _loadat the rear stage is electroless, the current of 12V to 5V does not work, and the MCU is electroless. At the moment, no direct current load is electrified, and the power consumption of the whole circuit is very small. When the work is needed, the rebound type power supply key SW1 is pressed down, at the moment, a Q1 emitter junction forms a passage through R8, D1 and SW1, Q1 is conducted, 12V _loadis electrified, a 12V-to-5V circuit works, 5V is electrified, and the MCU works. Meanwhile, the MCU definition pin Power _ Control sends a 2KHz square wave which has an alternating current component signal, the square wave passes through a resistance-capacitance R16/C2/D2 and C3 filtering and outputs direct current of about 2.5V approximately, so that a triode Q2 is conducted, after the triode Q2 is conducted, Q1 is conducted, and 12V _loadis electrified, therefore, the Control output of a direct current load Power supply in the Power-on process can be realized, and the whole system can work normally.
In a protection state, R6 is a current detection resistor of an alternating current load, after current flows through the resistor, a certain voltage difference exists, the voltage drop is sent to an operational amplifier U2B to be amplified, the amplified voltage is obtained and then is input to an MCU, and the MCU can confirm the current condition of the alternating current load at the moment after calculation. Therefore, the alternating load current at a certain moment is judged to be compared with the preset maximum current, and whether the load is turned off or not is confirmed, and even the wave generation of the Power _ Control pin is stopped. The U2A is a hysteresis comparator, the voltage of the current detection resistor R6 is compared with the preset reference voltage, if the voltage of the current detection resistor R6 is higher than the preset reference voltage, the fact that the current on the load exceeds a preset hardware overcurrent protection value is indicated, the U2A outputs a low level, the base voltage of the triode Q2 is forcibly pulled down, the triode Q2 is turned off, and therefore the triode Q1 is turned off, the MCU is powered down, and all loads are turned off.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A power switch control circuit is characterized by comprising a first voltage transformation module, a wake-up electronic switch module, a second voltage transformation module and an MCU (microprogrammed control unit);
the first voltage transformation module receives an external voltage, reduces the external voltage to a first voltage, and outputs the first voltage to the awakening electronic switch module; when a wake-up operation is detected, the wake-up electronic switch module is instantly conducted and outputs the first voltage to the second voltage transformation module, and the second voltage transformation module reduces the first voltage to the rated voltage of the MCU and outputs the rated voltage of the MCU to the MCU; and the MCU is electrified and started to output a normally closed signal to the awakening electronic switch module so as to keep the awakening electronic switch module in a conducting state.
2. The power switch control circuit of claim 1, wherein the wake-up electronic switch module comprises a wake-up switch and an electronic switch;
the input end of the wake-up switch is connected with the first voltage transformation module, and the output end of the wake-up switch is connected with the second voltage transformation module; the input end of the electronic switch is connected with the first voltage transformation module, the output end of the electronic switch is connected with the second voltage transformation module, and the control end of the electronic switch is connected with the MCU.
3. The power switch control circuit of claim 2, wherein the wake-up switch comprises a resilient push-button switch.
4. The power switch control circuit of claim 1, wherein the wake-up electronic switch module comprises a first switch tube, a second switch tube and a key switch;
the input end of the first switch tube is connected with the first voltage transformation module, the output end of the first switch tube is connected with the second voltage transformation module, the control end of the first switch tube is connected with one end of the key switch, and the other end of the key switch is grounded; the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is grounded, and the control end of the second switch tube is connected with the MCU.
5. The power switch control circuit of claim 4, wherein the wake-up electronic switch module further comprises a diode, an anode of the diode is connected to the control terminal of the first switch tube, and a cathode of the diode is connected to one terminal of the key switch.
6. The power switch control circuit of claim 4, further comprising a filter component, wherein the MCU is connected to the control terminal of the second switch tube through the filter component.
7. A power switch control circuit as claimed in any one of claims 4 to 6, wherein the first switch tube and the second switch tube comprise a triode or a MOS tube.
8. The power switch control circuit of claim 1, further comprising a load current detection module connected to the MCU;
the load current detection module detects a load current value, sends the load current value to the MCU, the MCU compares the load current value with a preset load current threshold value, and when the load current value is larger than the preset load current threshold value, the MCU stops outputting a normally-closed signal to the awakening electronic switch module so as to turn off the awakening electronic switch module.
9. The power switch control circuit of claim 8, wherein the load current detection module comprises a current detection resistor and an operational amplifier comparator;
the current detection resistor is connected with the load in series, the in-phase input end of the operational amplifier comparator is connected with one end of the current detection resistor, the reverse input end of the operational amplifier comparator is connected with the other end of the current detection resistor, and the output end of the operational amplifier comparator is connected with the MCU.
10. The power switch control circuit of claim 1, wherein the MCU is configured to stop outputting the normally-closed signal to the wake-up electronic switch module when the self-checking is abnormal, so as to turn off the wake-up electronic switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222320312.3U CN218383706U (en) | 2022-09-01 | 2022-09-01 | Power switch control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222320312.3U CN218383706U (en) | 2022-09-01 | 2022-09-01 | Power switch control circuit |
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| CN218383706U true CN218383706U (en) | 2023-01-24 |
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| CN202222320312.3U Active CN218383706U (en) | 2022-09-01 | 2022-09-01 | Power switch control circuit |
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