Power supply electronic switch circuit capable of being automatically controlled and completely powering off

Abstract

The invention relates to a power supply electronic switch circuit capable of being automatically controlled and completely powering off, comprising a power supply electronic switch, an external signal source, an interface circuit, a program control circuit, a matching circuit, a driving circuit and an external direct-current power supply, wherein the external signal source can control the power supply electronic switch to be switched on and off; the interface circuit is matched with the external signal source to control the power supply electronic switch to be switched on and off; after the power supply electronic switch is switched on, the program control circuit outputs a control signal; the matching circuit is used for carrying out energy storage and signal matching; and the driving circuit is driven to control the power supply electronic switch to be switched on and off. According to the power supply electronic switch circuit, under the control of an external signal, the switching-on / off control of the power supply electronic switch can be reliably realized; and under the control of the program control circuit, one driving circuit is additionally arranged so that the power supply electronic switch can be reliably powered off when being automatically controlled; and the function of automatically switching off the power supply electronic switch can be operated normally under a low-power-supply voltage condition.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power supply electronic switch circuit with self-control and complete power-off. Background technique [0002] Power electronic switching circuits are widely used because of their small size and convenient control. [0003] In the power electronic switch circuit, the on-off of the power electronic switch is controlled by its control port signal. Generally, the power supply of the control signal provider is not controlled by the power electronic switch, that is, the power supply of the control signal source is not controlled by the power electronic switch. It still maintains power supply when it is turned on, which is not suitable for handheld devices and other low supply voltage and low power consumption applications. [0004] With the advancement of technology, the power supply of the control signal source can now be controlled by the power electronic switch. When the po...

AI Technical Summary

Problems solved by technology

In the process of self-controlled power-off, with the disconnection of the power electronic switch, the internal power supply voltage gradually drops. When it drops to a certain voltage, the semiconductor control circuit will enter an out-of-control state due to the characteristics of the semiconductor device. When the peripheral circuit When the design is not considered or considered insufficiently, the loss of control of the control circuit under the condition of low supply voltage will lead to the failure of the self-control power-off function of the power electronic switch or failure under certain conditions

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