Voltage detection circuit of motor controller for electric vehicle

Abstract

The invention discloses a voltage detection circuit of a motor controller for an electric vehicle. The voltage detection circuit comprises a voltage input circuit, an input differential operation circuits, an analog opto-coupler isolation circuit, a voltage follower and a DSP (Digital Signal Processing) processor, wherein an output end of the voltage input circuit is connected with an input end of the input differential operation circuit, and an output end of the input differential operation circuit is connected with an input end of the analog opto-coupler isolation circuit; and an output end of the analog opto-coupler isolation circuit is connected with an input end of the voltage follower, and an output end of the voltage follower is connected with a detection port of the DSP. According to the voltage detection circuit, the cost is saved, simultaneously the voltage value of a power supply of the motor controller can be monitored in real time by hardware, and the supply voltage parameters of the controller can be supplied to a motor control system of a pure electric vehicle.

Description

technical field [0001] The invention belongs to the design field of electric vehicle motors and controllers thereof, and in particular relates to a motor controller voltage detection circuit for electric vehicles. Background technique [0002] At present, pure electric vehicles are a hot field of research and development, and the application of permanent magnet synchronous motors in electric vehicles is becoming more and more extensive. In order to ensure that the motor controller system works normally within a certain power supply voltage range, the voltage value of the power supply of the controller must be monitored. Therefore, the hardware circuit is used to collect the voltage signal. [0003] Because the general voltage acquisition circuit is affected by environmental noise, the voltage signal is unstable, and the error of the collected signal is relatively large. In addition, the use of Hall voltage sensors to achieve DC voltage isolation and conversion is also a com...

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Problems solved by technology

[0006] Although the above circuit is simple in structure and easy to implement, figure 1 It is suitable for lines with less environmental noise, but when used in a complex environment, it is susceptible to the influence of the external environment and interference, which makes the collected voltage value deviate from the actual value and affects the stability of the system.

figure 2 Although avoid figure 1 However, the voltage sensor is expensive, the volume is large, and the PCB layout of the control circuit is limited, which increases the production cost of the controller.

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