EMI reduction circuit

Details EMI reduction circuit EMI reduction circuit

1985-12-23

1988-03-08

Salce, Patrick R.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 86, 363126, H02M 114

Patent

active

047302437

ABSTRACT:
Prior types of power conversion circuits for converting AC power into DC power have generated large amounts of undesirable electromagnetic interference (EMI) due to the rectification of the AC power. Such EMI has been reduced in the past by large and heavy filters which have undesirably increased the size and weight of such conversion circuits. In order to overcome this problem, a harmonic reduction circuit according to the present invention includes a current sensor for sensing the current in the AC lines, circuitry for developing a pulse width modulated (PWM) waveform having a duty cycle dependent upon the sensed AC line current and a switching circuit coupled to the AC power line and controlled by the PWM waveform developing circuitry for compensating the AC line current whereby undesired harmonics therein are reduced.

REFERENCES:
patent: 3909700 (1975-09-01), Ferro
patent: 4053820 (1977-10-01), Peterson et al.
patent: 4131844 (1978-12-01), Hucker et al.
patent: 4143414 (1979-03-01), Brewster et al.
patent: 4302717 (1981-11-01), Olla
patent: 4366532 (1982-12-01), Rosa et al.
patent: 4390831 (1983-06-01), Byrd et al.
patent: 4412277 (1983-10-01), Mitchell
patent: 4460950 (1984-07-01), Finney
patent: 4520437 (1985-05-01), Boettcher, Jr. et al.

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