Development of High Speed Digital PWM Controller for High Performance Next Generation Power Devices
| Project/Area Number |
17560247
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Chiba University |
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Principal Investigator |
SATO Yukihiko Chiba University, Faculty of Engineering, Professor (50205978)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Inverters / High Frequency Switching / High Power Density |
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| Research Abstract |
In recent years, switching frequency of 10kHz or above is commonly used even in low cost general-purpose inverters for AC drive. This range of the switching frequency may be enough high for the reduction of the torque ripple and acoustic noise in inverter-fed motors. From these points of view, the further increase of the switching frequency is not needed any more. However, the higher switching frequency is still strongly needed in some advanced applications to meet the severe requirements to the power converters such as size reduction, weight reduction, higher output power density, higher precision output waveforms, and higher speed response. As a method to realize higher switching frequency, power semiconductor switching devices in the next generation using new materials such as SiC and GaN are actively being developed. To utilize the ability of these high-speed switching devices fully, methods for pulse width modulation (PWM) suitable for the higher switching frequency must be developed.
In digital PWM controller, the pulse width is controlled using a digital counter driven by the internal clock signal. Thus, for a given internal clock frequency, the resolution of the counter is inversely proportional to the switching frequency of the inverter. Consequently, a higher switching frequency results in lower PWM resolution. The poor resolution of the PWM operation may cause undesirable lower order harmonic components in the output current. In this case, the benefit of the higher switching frequency can not be obtained.
In this research, the application of the noise shaper to reduce output waveform distortion due to the poor resolution of the high switching frequency three phase PWM voltage source inverters is discussed. From the experimental investigation, the noise shaper can be effective solution to realize the high switching frequency PWM inverter with high quality output waveforms.
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Report
(3 results)
Research Products
(3 results)
