Harmonic-injection control technique for three-phase, discontinuous-conduction-mode, high-power-factor boost rectifiers with improved line-transient response
US6049473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A three-phase discontinuous-conduction-mode (DCM), pulse-width-modulated (PWM) boost rectifier using harmonic-injection control is provided with a feedforward path to vary the duty cycle of the PWM modulator according to the input voltage, so as to provide improved transient response. In one embodiment, the feedforward path provides to the PWM modulator a ramp voltage that has a slope proportional to the magnitude of the input line voltage. In one embodiment, the harmonic injection signal is summed with the error signal of an output feedback loop. In another embodiment, the harmonic injection signal is integrated and summed with the ramp voltage of the feedforward path. Moreover, by adding a nonlinear gain control circuit, the DC gain of the DCM boost rectifier at light load is adaptively reduced to achieve stability of the rectifier at light load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.