Control device for active filter
US4906860A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1989 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | May 5, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control device for an active filter according to the present invention comprises a ROM circuit for producing output signals sin .theta. and cos .theta. from a phase signal generated from a PLL circuit, a first multiplier for multiplying a load current detection signal by the output signals sin .theta. and cos .theta., a sample-holding circuit for integrating the output signal of the first multiplier and holding the integrated value to produce peak values of valid current component and invalid current component for constituting the basic wave component of the load current, a second multiplier for multiplying the peak values by the output signals sin .theta. and cos .theta., and a PWM control circuit for PWM-controlling the input current of the active filter with a harmonic current signal obtained as the difference between a basic wave current signal of the load current during a period of next one period of the single-phase a.c. power source and the load current detection signal by utlizing as the basic wave current signal of the load current of the period of next one period of the single-phase a.c. power source the basic wave current signal obtained by combining the valid current …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.