Charging and discharging circuit sharing pre-charging resistor, control method and automobile

Abstract

The invention discloses a charging and discharging circuit sharing a pre-charging resistor, a control method and an automobile. The pre-charging circuit comprises a battery, a first normally open switch, a second normally open switch, a third normally closed switch and a pre-charging resistor, wherein the first end of the pre-charging resistor is electrically connected with the positive electrodeof the battery through the second normally open switch; the second end of the pre-charging battery is electrically connected with the positive electrode of the battery through the first normally openswitch; the first end of the pre-charging battery is electrically connected with the negative electrode of the battery through the third normally closed switch; and the negative electrode of the battery and the second end of the pre-charging resistor are used for being electrically connected with the two ends of a motor controller respectively. According to the charging and discharging circuit sharing the pre-charging resistor, the control method and the automobile, the structure is simple, active discharging is achieved through the pre-charging resistor, active discharging can still be achieved under the condition that no low-voltage electricity exists or a corresponding controller is damaged, and then high-voltage safety is more reliable.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a charging and discharging circuit sharing a pre-charging resistor, a control method and a vehicle. Background technique [0002] For the motor controller in electric vehicles, due to the large internal capacitance, it is necessary to actively discharge the electric energy on the DC bus in the motor controller as soon as possible to reduce the bus voltage in order to realize High voltage safety. [0003] The current active discharge scheme is to reduce the DC bus voltage as soon as possible by controlling the motor to generate a certain current to consume the electric energy on the high voltage bus after the motor controller is disconnected from the high voltage of the battery. This solution realizes active discharge through motor control without adding additional components, thereby reducing system cost. However, the premise of this solution is that the motor control...

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Problems solved by technology

However, active discharge cannot be achieved due to the inability of the motor controller to work

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