Power control unit having switching phase control for reducing v

Details Power control unit having switching phase control for reducing v Power control unit having switching phase control for reducing v

1998-08-25

2000-03-14

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

323300, 323320, 323234, 219497, G05F 110, G05F 500, G05B 2402, H05B 102

Patent

active

060377577

ABSTRACT:
When the phase control is effected on a supply voltage to a load having positive resistance characteristics with respect to temperatures before a current is allowed to pass, a voltage is supplied for a current passing time T1, and the voltage is supplied for a current passing time T2 longer than the current passing time T1, and the voltage is supplied for a current passing time T3 shorter than the current passing time T2. Also, a second control pattern is effected at least once, in which the current is passed while the current passing time is kept substantially constant, then the current passing time is extended before the attenuation rate of the peak value of the resulting load current saturates, and then the current is passed while the extended current passing time is kept substantially constant. Consequently, a voltage drop can be reduced effectively without causing large distortion of the current waveform or large conduction noise by omitting an expensive noise filter or special hardware.

REFERENCES:
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patent: 4928055 (1990-05-01), Kaieda et al.
patent: 5079409 (1992-01-01), Takada et al.
patent: 5543904 (1996-08-01), Kato et al.
patent: 5600233 (1997-02-01), Warren et al.
patent: 5627634 (1997-05-01), Koh
patent: 5907743 (1999-05-01), Takahasi

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