Circuit principle analysis of IGBT mining locomotive servo controller 2.1 Power supply part. The power supply part consists of battery pack, isolation diode D1, smoothing capacitors C1 and C2. The DC breaker is closed, the drive board receives DC voltage, and is DC/DC converted to get +
24V power supply. 2.2 Driver Board Driver board adopts STC12C5A series MCU as the core component of the whole circuit, which is used to provide various control signals for load such as reversing contactor, speaker, IPM, illumination lamp and so on. STC12C5A series MCU is a new generation 8051 MCU with high speed/low power consumption and super anti-interference. The internal setting has a dedicated reset circuit and 2 PWM.
8-channel 10-bit high-speed A/D conversion, ideal for motor control and strong interference applications. The IPM in the driver board integrates the power switching device and the driver circuit, and has over voltage, under voltage, over current and over temperature protection functions, and can send the detection signal to the CPU for interrupt processing. At the same time, because IPM has self-shutdown capability, it does not need to force the converter circuit, which simplifies the main circuit and greatly reduces the volume. It is a current control component, and there is no problem of commutation failure; IPM operating frequency exceeds audio (1000HZ～4000HZ) ), power supply to the series motor can greatly reduce the filter capacity, to achieve 256
Stepless speed regulation. The IPM interface circuit is also extremely simple, and it is very convenient to replace. Simply pull out the 5-pin plug and remove the fixing screw to remove the module for replacement.
