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High voltage motor driver

Produces clean and stable 390VDC to motor control sub-system

There are motors and motor control all around us. In this design, we highlight a high-voltage motor application suitable for appliances, HVAC compressors and fans, etc. We combine power factor correction (PFC), now required by many power providers, to produce a clean and stable 390VDC to the motor control sub-system. The heart of the motor control is a 32 bit high-performance RISC processor, the RX23T, containing a floating point unit (FPU) to simplify the algorithm implementation. Utilizing a 3-phase timer with complementary outputs, the RX23T supports a wide variety of algorithms that can be downloaded. In this particular block diagram, we are showing hardware to support sensor-less Field Oriented Control (FOC) utilizing multi-shunt phase-current sampling.

Key features:

  • Single-phase PFC boost controller to provide stable bus voltage (390VDC) for the system
  • Universal input voltage support (85-240VAC)
  • Power factor as high as 0.999, efficiency up to 98%
  • High performance op-amps for conditioning the shunt voltage for fast sampling
  • High-speed ADC (1uS) with multi S/H to simplify motor phase current sampling
  • Efficient FOC algorithm that leaves plenty of MCU cycles for other tasks (communication typical)
electric clothes dryer control panel

Recommended products

Products Description Documents
RX23T RXv2 core, FPU, DSP, low cost and high performance for control applications User's manual
Buck Regulator    
ISL85415 Wide VIN 500mA synchronous buck regulator Datasheet
Op Amp    
ISL28148 4.5MHz single precision rail-to-rail input-output (RRIO) op amp with very low input bias current Datasheet
PFC Controller    
ISL6730B Power factor correction controller Datasheet


Block diagram

block diagram

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