Zero-power-consumption switching circuit

Abstract

The invention discloses a zero-power-consumption switching circuit comprising a PNP type first triode, a PNP type second triode, an NPN type third triode and an NPN type fourth triode. The input end of a main power supply is connected with the emitter of the first triode, a fourth resistor is connected between the input end of the main power supply and the base of the first triode, the collector of the first triode is connected with the emitter of the second triode, and an eighth resistor is connected between the collector of the first triode and the base of the second triode; the collector of the first triode is connected with the power input end of a microcontroller, a diode of the signal input end of the microcontroller is connected with a starting switch of a switching power supply, and the signal input end is further connected with the input end of the main power supply through a second resistor; the signal output end of the microcontroller is respectively connected with the bases of the third triode and the fourth triode, the collector of the third triode is connected with the base of the first triode, the collector of the third triode is connected with the starting switch, and the collector of the fourth triode is connected with the base of the second triode.

Description

technical field [0001] The invention relates to a switch circuit, in particular to a zero-power consumption switch circuit. Background technique [0002] In some electrical equipment, in order to save power when the equipment is not working, it is often necessary to manually pull out the main power switch of the equipment, so that the equipment does not consume power in the standby state and reduce potential safety hazards. However, once the equipment needs to be re-enabled At this time, it is necessary to manually turn on or plug in the main power plug. Cause unnecessary trouble, and can make the service life of equipment reduce. Therefore, switching circuits are often used in practical applications to automatically turn off and start the main power supply of equipment, but the existing switching circuits do not achieve true zero power consumption. [0003] The authorized announcement number is: CN201918935U utility model patent and application number 201010271222.9 inven...

AI Technical Summary

Problems solved by technology

One is the capacitance value of the capacitor, which determines how long the system can still work normally after power off. The larger the capacitance value, the longer it can last, but the larger the capacitance value, the larger the capacitor itself, which is not conducive to equipment miniaturization and handheld use of equipment

The second is that the capacitance value of the capacitor will decay over time, so the longer this circuit lasts, the less reliable the work will be.

The third is that the work depends on the charging capacitor. If it is used for the first time or if it is not used for a long time, the capacitor will have no power and the circuit will not work. You must use another button to charge the capacitor, which is cumbersome to operate.

[0004] The invention patent application with the application number 201110062826.7 discloses a zero-power standby circuit, which is not a real zero-power consumption, because the infrared receiving and decoding part needs to be powered all the time to work in the standby mode, and the infrared receiving and decoding part itself is the power supply. source of consumption

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