Adjustable and non-resettable automatic outage circuit and method thereof

Abstract

The invention relates to an adjustable and non-resettable automatic outage circuit and a method thereof. The circuit comprises a clamping unit connected with an external power source and a charge-discharge management unit as well as a voltage monitoring positive feedback unit connected with the charge-discharge management unit, the clamping unit receives the input signal of the external power source, when the input signal of the external power source is a power failure signal, the output voltage is clamped to be a positive value or 0V, and the output voltage is transported to the charge-discharge management unit; the voltage monitoring positive feedback unit collects voltage output by the charge-discharge management unit, the output voltage is compared with a standard voltage, when the external power source is in power failure, the output voltage is ahead of the standard voltage, a 0V voltage is output, and the output voltage of a combination clamping unit is 0V so as to enable the output voltage of the charge-discharge management unit to be 0V. According to the adjustable and non-resettable automatic outage circuit, the system stability is maintained, adopting an adjustable automatic turn-off and unrestorable manner during turning off the voltage is realized, the power source stability of an electric system with two power sources is promoted, the potential risk existing in power supply is reduced, and the cost is low.

Description

technical field [0001] The invention relates to a dual power supply electronic system, more specifically to an adjustable and non-resettable self-off circuit and its method. Background technique [0002] With the progress of society, people have higher and higher requirements for the comfort and convenience of the living environment. The current electronic system uses a dual power supply mode of battery and external power supply, which is becoming more and more common. [0003] However, due to the unstable power supply of the battery itself, large voltage ripple when driving a large load, insufficient freewheeling, and limited I / O resources of the CPU itself, the system stability of the dual-power electronic system is not good when the battery voltage is low. There are two ways to solve this problem: the first way is to use MOS tubes or relays plus CPU system ADC and I / O resources, but this way takes up system chip ADC resources and virtually increases system costs. For sys...

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Problems solved by technology

[0003] However, due to the unstable power supply of the battery itself, large voltage ripple when driving a large load, insufficient freewheeling, and limited I / O resources of the CPU itself, the system stability of the dual-power electronic system is not good when the battery voltage is low. There are two ways to solve this problem: the first way is to use MOS tubes or relays plus CPU system ADC and I / O resources, but this way takes up system chip ADC resources and virtually increases system costs. For systems where the CPU does not have an ADC sampling module, this method is even more unfeasible; the power-off operation requires the CPU to operate passively, and the response mechanism is delayed, and there is a phenomenon that the power-off is not timely; the system power-off stays at the software level and cannot be done The real physical shutdown has great hidden dangers to the stability and safety of the system power supply; the second method is to use a non-removable battery body, and a large-capacity battery body is used by default instead of a small-capacity battery to improve the normal working time of the battery, and strongly reminds to use or charging in time, so as to shield the occurrence of power system instability, but this method fails to completely solve the power stability problem of the dual power electronic system, there are various power stability problems, and even explosions

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