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. At the heart of the motor control is a 32-bit high performance RISC processor, the Renesas 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 sensorless 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 (85VAC - 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 (1µS) with multi S/H to simplify motor phase current sampling
  • Efficient FOC algorithm that leaves plenty of MCU cycles for other tasks (communication typical)
System Block Diagram

Winning Combinations

Renesas and IDT’s complementary product portfolios work together to deliver comprehensive solutions to our customers. This is just the beginning, with the combination of the Renesas and IDT development teams, there will more integrated solutions that provide significant advantages over traditional solutions.

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