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概览
描述
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 / Forced air |
| PWM mode | 2-Level / 3-Level |
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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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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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40% reduction in reactor volume and weight for 3-Level (50 kHz) compared to 2-Level (20 kHz)
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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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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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*1.Please contact us for sample software, circuit data and demo boards.
Offer
- Application note
RX66T-Group Power Supply Control of a Three-Level Inverter by Using SiC Power Elements Rev.1.00 (PDF | English, 日本語) - CPU card
RX66T PU card
特性
- 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.