Pre-charging control device for motor controller of electric vehicle and electric vehicle using pre-charging control device

Abstract

The invention provides a pre-charging control device for a motor controller of an electric vehicle. The device comprises a power supply switch k1 and a pre-charging module, wherein one end of the power supply switch k1 is connected to the positive pole of the storage battery E1 of the electric vehicle, and the other end of the power supply switch k1 is connected to the positive pole of the capacitor bank Cz of the motor controller; the power supply switch k1 is used for controlling the on / off of the power supply loop of the motor controller; the pre-charging module is connected in parallel with the power supply switch k1 and is used for controlling the pre-charging state of the capacitor bank Cz of the motor controller. According to the pre-charging module, the phenomenon that the capacitor bank is always in a saturated state can be effectively avoided; the pre-charging control device has the overcurrent protection function, thus the capacitor bank is protected, and the service life of the capacitor bank is prolonged, so that the operating reliability of the motor controller is guaranteed, the electric quantity of the storage battery is not consumed by the pre-charging module, the travel distance of the electric vehicle can be prolonged, and a good energy-saving function is realized; and the pre-charging control device is simple in structure, low in manufacturing cost and easy to implement and popularize.

Description

technical field [0001] The invention relates to a power management device for a controller of an electric vehicle, in particular to a pre-charging control device for a motor controller of an electric vehicle and the electric vehicle thereof. Background technique [0002] The electric vehicle uses the battery as energy to drive the motor to achieve the purpose of driving the electric vehicle. The work of the electric vehicle motor is controlled by the motor controller. There are many large capacitors for filtering and voltage stabilization inside the motor controller. The positive pole of the large capacitor It is directly connected to the positive pole of the battery through a switch. When the switch is directly turned on, the battery will instantly charge the capacitor with a very large current, and the impact will affect the life of the capacitor and the reliability of the controller. [0003] Therefore, in order to solve the above-mentioned problems, there are currently t...

AI Technical Summary

Problems solved by technology

This solution effectively solves the problem of charging the capacitor with a large current in an instant, but there are still the following problems in this solution: first, the relay contact has no over-current protection function; second, the total power supply is controlled by multiple relays, and the relay itself Can consume valuable energy from electric vehicles; finally, pre-charging circuits controlled by multiple relays are complex and costly

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