Overview

Description

This solution is for digital control of photovoltaic power conditioners, UPS and industrial 3-phase DC/AC inverter power supplies. You can increase the system efficiency and reduce the size and weight of the filter reactors that cut harmonic components by applying a low-loss SiC power element and 3-level (T-type) circuit topology to the inverter circuit.


●3-level inverter power supply unit

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Items Specifications
Output power 10kW
Output voltage 3Φ、400Vac
Output frequency 50 or 60Hz
Input voltage range 750Vdc、600~850V
Inverter switching frequency 20~50kHz
Power factor 0.8
Cooling Method Natural air / Foced air
PWM mode 2-Level / 3-Level
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3-level inverter power supply unit

Primary applications: DC/AC power converters

  • Power conditioners for solar power generation
  • UPS uninterruptible power supplies
  • Industrial power supplies

●3-level inverter application effects

The PWM output voltage waveform of the 3-level inverter more closely approaches a sine wave.

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PWM output voltage waveform

●Comparison of the high-frequency components of the PWM output voltage

There are fewer harmonic components in the 3-level inverter output PWM voltage, resulting in smaller, lighter and lower cost filter reactors to cut the high harmonic components

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Reduction in size, weight, and cost of filter reactors

40% reduction in reactor volume and weight for 3-Level (50 kHz) compared to 2-Level (20 kHz)

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Reduced reactor volume and weight

●Reduction of switching losses

The switching operation of the power components is performed at half the DC power supply voltage, effectively reducing switching losses and increasing efficiency

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Reduction of switching losses

◆Renesas 3-level DC/AC 3-phase inverter control solution

Application note (APN), sample software and development support tools for DC/AC 3-phase inverter power converter control are provided.

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APNs, sample software, and development support tools provided

*1.Please contact us for sample software, circuit data and demo boards.

◆Offer

Features

  • Both 2-level and 3-level operation modes are supported.
  • Can support switching frequencies from 20kHz to 50kHz, which allows for increased power density and smaller and lighter filter reactors (magnetic components).
  • The 6 channels of GPT timers in the RX66T can be operated synchronously to simultaneously output the 12 PWM gate signals required for a 3-level inverter.
  • Application notes, sample programs, development tools, and circuit data are available, so you can start development immediately.