Trigger type power-on and controllable power-off power supply control scheme

Abstract

The invention discloses a trigger type power-on and controllable power-off power supply control scheme. The power supply control scheme comprises an external power-on control signal isolation circuit,an external power-on control signal latch circuit, an external power-on control signal state feedback circuit, a CPU power-off control circuit, a power-on and power-off control MOSFET drive circuit,a power-on and power-off control MOSFET (Q1), a DC / DC power supply and a CPU circuit. Due to the fact that an external power-on control signal latch circuit is arranged, latching can be conducted whena first effective high-level pulse is detected, and the anti-jitter function of a power-on signal can be achieved; and after the equipment finishes all operation functions, the CPU can automaticallycontrol power-off to enter a low-power-consumption sleep mode, and the equipment can be awakened through an external power-on control signal.

Description

technical field [0001] The invention relates to the technical field of power supply control, in particular to a power supply control scheme for new energy vehicle motor controllers, electric motorcycle controllers, communication power supplies, household appliances and other fields that need to be powered on through external hard wires. Background technique [0002] In common products, the control power is generally directly controlled by mechanical or electrical switches, and the design is relatively simple and easy to implement, such as figure 1 , the control power supply passes through the first-level switch, then connects to the second-level switch, and finally connects to the control power supply port of the device. [0003] figure 1 The control method of the circuit is: when the first-level switch is turned on, the power is turned on through the second-level switch, so that the equipment is in a power supply state. [0004] The control power supply mode has the follo...

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Problems solved by technology

[0006] b) When the device is used in a car, the control power supply sometimes needs to be connected to normal power, that is, the primary and secondary switches are always on, and the device cannot enter a low-power sleep state;

[0007] c) When the device is in operation, when the device is connected to normal power (that is, the primary switch is normally closed), and the secondary switch is disconnected urgently, the control power supply will suddenly lose power, which may cause data loss or even loss of control, serious cause safety accident

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