The STEVAL-CTM014A has been designed to drive a 3-phase brushless DC motor
up to 700 W typically of a washing machine appliance.
The circuit is composed of four parts: the control part, the compressor drive part, the
auxiliary power supply circuit, and the communication circuit.
The control part uses STM32G431CB as the main control chip, which is mainly used
to control motors. It also includes: current, voltage, temperature sampling, the
realization of communication, overcurrent protection, over voltage protection, over
temperature protection.
The compressor drive part includes a three-phase inverter circuit, lower bridge
current sampling of IPM (current sampling is realized by STM32G431CB internal
integrated operational amplifier).
The three-phase inverter bridge adopts STGIPQ8C60T-HZ intelligent power module.
The STGIPQ8C60T-HZ includes six IGBTs and gate drive circuits, as well as NTC
temperature sampling and overcurrent comparison circuits.
The auxiliary power supply circuit includes: transformer, switching power supply
controller, power switch tube, rectifier diode, etc.
The VIPER122 integrates a switching power supply control chip and power MOSFET,
and also has short-circuit protection functions. Mentioned functions simplify the
design of the power supply and reduce the size of the power supply.
About the communication circuit, the STEVAL-CTM014A designs a single-line halfduplex serial communication circuit with isolation, this allows convenient
communication with the washing machine control panel.
