Pre-charging circuit controlled by battery management system and rail vehicle

Abstract

The invention discloses a pre-charging circuit controlled by a battery management system and a rail vehicle, and the circuit comprises a battery pack, two ends of which are connected with a first voltmeter for obtaining a first voltage; the capacitive load equipment is connected with a pre-charging resistor in series, the whole body after series connection is connected with the first voltmeter in parallel, and the load equipment is connected with a second voltmeter for obtaining second voltage in parallel; the first switch is connected with the pre-charging resistor in parallel, and when the first switch is closed, the pre-charging resistor can be short-circuited; and the battery management system is connected with the first voltmeter so as to obtain a first voltage, and the battery management system is connected with the second voltmeter so as to obtain a second voltage. After the second voltage at the two ends of the capacitive load equipment is detected to reach the preset standard, the pre-charging resistor is automatically disconnected from the circuit, so that insufficient pre-charging is prevented, and the fault of the pre-charging resistor caused by overlong pre-charging time is avoided.

Description

technical field [0001] The invention relates to the technical field of rail vehicles, in particular to a pre-charging circuit controlled by a battery management system and a rail vehicle. Background technique [0002] When the EMU battery supplies power to the entire load, due to the capacitive load in the entire load, a large current is required to charge the moment the power is turned on. At this time, the external connection breakpoint of the battery (usually a connector or contactor) may cause burnout. (hereinafter referred to as electrolytic corrosion phenomenon). [0003] In EMU products, there is an electrical corrosion problem. The existing solution is to add a set of pre-charging tooling connectors (manually increase the pre-charging process), pre-charging for a period of time, and then connect the main power supply connector to the load. [0004] The disadvantages of the existing manual precharging include: the need to increase the reserve of hardware spare parts ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of existing manual pre-charging include: the need to increase the hardware spare parts reserve of the external pre-charging connector, and also increase the procurement cost; the operator needs to follow the specific operation instructions, human participation, and low degree of automation; pre-charging to the main power supply process The middle is the estimated time through the calculation, and the connector is manually plugged and unplugged (the longer the pre-charging time is, the safer it is). The operation process varies from person to person, and there are certain hidden dangers such as insufficient pre-charging or too long pre-charging time that may cause resistance failure.

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