Electric control car controller

Abstract

The invention relates to an electric motor car controller comprising a power interface, a control circuit and a motor signal interface, wherein the control circuit comprises an undervoltage protection circuit, a charging state detection circuit, a rolling handle input circuit, a rolling handle failure protective circuit, a power tube breakdown detection circuit, an electrified time sequence protective circuit, a relay, a current-limiting detection circuit of current, a PWM (Pulse-Width Modulation) control circuit, a power tube driver circuit, a power tube voltage-stabilizing protective circuit and a power tube. With the undervoltage protection circuit, the invention avoids the damage caused by overdischarge of the storage battery; with the power tube breakdown detection circuit and a rolling handle state detection circuit, the invention avoids the runaway generated by relay adhesion, PWM modulation chip damage, power tube driver circuit damage and broken-down faults of the power tube and can better effectively control the motor. In addition, the invention can self-diagnose electric faults, solves the problem of eliminating low fault speed and has low fault rate and easier debugging and modification.

Description

technical field [0001] The invention belongs to a controller, in particular to an electric vehicle controller. Background technique [0002] With the rapid development of social economy, people have higher and higher functional requirements for electric vehicles, satisfying people's desire for transportation. In the brushed motor controller in the prior art, when various faults occur in the control circuit, such as the following situations: damage to the PWM modulation chip, breakdown of the power tube, and other circuit faults cause the motor to continue to lose control. At this time, the controller responds to the brake signal And the PWM control signal does not respond, the power supply voltage is directly applied to both ends of the motor, so that the motor runs at high speed, if there is no protection function to turn off the motor power supply or stop the PWM output, accidents will inevitably occur, posing a threat to production, life or personal safety . The brushed...

AI Technical Summary

Problems solved by technology

[0003] 1. When the power supply voltage is too low, the controller still continues to output, which will cause damage to some DC power supplies (such as lead storage batteries, lithium batteries, etc.) due to excessive discharge;

[0004] 2. When the current flowing in the power tube increases with the load until it exceeds the maximum current that the power tube can withstand, the power tube is damaged because the controller has no protection circuit;

[0005] 3. When the relay is stuck, the PWM modulation chip is damaged, the power tube drive circuit is damaged, the power tube is broken down, etc., the power supply voltage is directly applied to both ends of the motor, and the controller does not respond to the brake signal and the handle signal, resulting in motor failure. When out of control, there is no protection function to turn off the motor power supply or stop the PWM output;

[0006] 4. When the handle cannot be reset due to human reasons, mechanical failures, circuit failures, etc., causing the motor to lose control, there is no protection function to shut off the motor power supply or stop the PWM output;

[0007] 5. Under the premise that the power tube breaks down and the breakdown protection circuit fails, the contacts of the relay are stuck. After the system is powered on, the whole vehicle starts to move when there is no handlebar input, and there is no handlebar protection function.

[0008] 6. The discharge current of the whole vehicle system in the standby state is large, causing damage to the battery pack due to excessive discharge

[0009] 7. When the controller is used to charge the power supply, start the running handle, the controller still continues to output, and there is no protection function to shut off the motor power supply or stop the PWM output

[0010] 8. The gate drive of the power tube lacks a voltage stabilizing circuit. When the drive circuit is subjected to overvoltage shocks, it is easy to cause damage to the power tube.

[0011] 9. The diode of the power tube drive circuit turns slowly, and it is easy to break down when the circuit works at high frequency. After the breakdown, the power tube drive circuit is damaged, resulting in thermal breakdown of the power tube

[0012] 10. On the premise that there is no delay in power-on, the power tube protection circuit is prone to misoperation, resulting in false protection, and the vehicle system cannot be started.

[0013] 11. The PWM carrier frequency is too high, the efficiency of the power tube is low in the working state, which causes the ripple current of the charging capacitor to be too large, causing the capacitor to break down and the power tube to be damaged

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