Vehicle-mounted power supply device and control circuit of vehicle-mounted power supply

Abstract

The invention discloses a vehicle-mounted power supply device and a control circuit of the vehicle-mounted power supply. The control circuit of the vehicle-mounted power supply comprises an awakening module and a self-locking module, wherein a control signal output end of the awakening module is connected to an enabling pin of a power supply chip, the awakening module outputs an awakening enabling signal to the power supply chip at the moment of power on, so that the power supply chip can supply power to a MCU; and the self-locking module is connected with the awakening module, the self-locking module is used for controlling the awakening module to lock the awakening enabling signal when the awakening module outputs the awakening enabling signal, so that the power supply chip can continuously supply power to the MCU, so that the MCU can be started. According to the control circuit of the vehicle-mounted power supply, a self-locking circuit is additionally arranged on the basis of a traditional awakening circuit, so that a large capacitance value capacitor does not need to be arranged in the awakening circuit, the cost is greatly reduced, and the problem that the MCU cannot be started when the vehicle-mounted power supply is quickly powered on and off is solved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a vehicle power supply control circuit and a vehicle power supply device having the vehicle power supply control circuit. Background technique [0002] In related technologies, when the vehicle power supply is powered on, the power chip is woken up by waking up the circuit, so that the power chip supplies power to the MCU to start the MCU, and after the MCU is started, the MCU outputs control information to control the power chip to maintain the on state . If you want the power chip to work stably after it is turned on, you need the MCU to complete startup, initialization, and output control information in a very short time. However, the current MCU startup process takes a long time, which requires setting a large-capacity charging and discharging capacitor in the wake-up circuit to ensure that the power chip remains on. When powering on and off, the capacitor may not be fully...

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a kind of vehicle-mounted power supply control circuit, by adding self-locking circuit on the basis of traditional wake-up circuit, thus needn't arrange large-capacity capacitor in wake-up circuit, not only greatly reduce cost, but also can Solve the problem that the MCU cannot start when powering on and off quickly

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