Low-power-consumption time-delaying power-down circuit of electric automobile and control method

Abstract

The invention discloses a low-power-consumption time-delaying power-down circuit of an electric automobile and a control method. The method comprises the steps that an enabling signal identifying circuit collects multiple power-on and power-off enabling signals of different types, and when it is identified that the states of all collected signals are invalid states, power-down signals are output to a delaying time judgment circuit; the delaying time judgment circuit receives the power-down signals which are sent by the enabling signal identifying circuit and conducts time delaying, and outputsthe power-down signals to a power source switch driving circuit after delaying time is up; the power source switch driving circuit sends power-down driving signals to a power source switch executioncircuit; the power source switch execution circuit switches off the circuit according to the power-down driving signals which are sent by the power source switch driving circuit. According to the low-power-consumption time-delaying power-down circuit of the electric automobile and the control method, static-state power consumption and time-delaying power-down functions can be achieved at the sametime, after power-down, static-state power consumption does not exist at all, and compared with an existing power source management chip scheme, static-state power consumption is lower in cost, static-state power consumption is smaller, and more power is saved.

Description

technical field [0001] The invention relates to an electric vehicle, in particular to a low-power consumption delay power-off circuit and a control method for the electric vehicle. Background technique [0002] Under the background of the era when the production of new energy vehicles is in full swing, the development of electric vehicles is becoming more and more extensive. In the performance specification of the vehicle system, in order to reduce the static power consumption of the 12V lead-acid battery to the lowest value, it is necessary to put forward the limit value requirements for the static power consumption of each 12V electric load; in order to meet the requirements of low power consumption, the most direct and That is, the optimal way is to cut off the load; at the same time, in order to meet the delayed power-off function of the vehicle system, the delay time for cutting off the load can be calibrated by software. [0003] The inventor researched the delayed po...

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Problems solved by technology

[0003] The inventor researched the delayed power-off function of the existing electric vehicles and found that most of them are realized by controlling the corresponding power management chip, which is costly. More importantly, the existing power management chip itself is still There is considerable power consumption, and the power supply is not cut off sufficiently, resulting in continuous consumption of static power consumption of the battery

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