Power supply control circuit, forklift power supply circuit and forklift

Abstract

The embodiment of the present invention discloses a power supply control circuit, wherein the first relay controls the connection between the battery positive terminal and the battery positive output terminal, and the battery negative terminal is connected to the battery negative output terminal; the first self-resetting switch and the second relay Both are used to control the connection between the positive connection terminal of the battery and the positive power connection terminal of the DC / DC power module, and the negative connection terminal of the battery is connected to the negative power connection terminal of the DC / DC power supply; the DC / DC power supply is used to supply power to the battery management system ; The second self-resetting switch is used to control the connection between the DC / DC power supply and the level detection terminal of the battery management system; the battery management system is used to control the conduction of the first relay and the second relay when powered on, and When the level detection terminal detects a level signal meeting the preset condition, the first relay and the second relay are controlled to be disconnected. The embodiment of the present invention can completely cut off the power supply of the battery management system when the power supply to the load is turned off, so as to realize the zero power consumption of the shutdown.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power supplies, and in particular to a power supply control circuit, a forklift power supply circuit and a forklift. Background technique [0002] Faced with the increasingly stringent exhaust emission standards in China and the world and the energy crisis in the future, major automakers are developing low-emission new energy technologies to adapt to this development trend, among which pure electric vehicles are currently the major automakers. one of the areas of research and development. [0003] As a special vehicle equipment, a forklift is equipped with a battery management system (Battery Management System, BMS). At present, the power supply systems of forklifts all use self-locking switches to start the power supply of lithium batteries, and the BMS chip cannot be turned off. Even if the existing BMS has undervoltage sleep, it cannot achieve zero power consumption, which wi...

AI Technical Summary

Problems solved by technology

At present, the power supply systems of forklifts all use self-locking switches to start the power supply of lithium batteries. The BMS chip cannot be turned off. Even if the existing BMS has under-voltage sleep, it cannot achieve zero power consumption, which will easily lead to battery exhaustion.

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