H - Electricity – 02 – M
Patent
H - Electricity
02
M
318/108
H02M 5/257 (2006.01) G05F 1/455 (2006.01) H02M 1/08 (2006.01)
Patent
CA 1184597
AC Power Control Circuit Abstract An improved control circuit for accurately regu- lating the power from a supply of unregulated AC voltage to a load, such as a fan motor, via a signal responsive conduction-control switch. The circuit employs first and second comparators. One input to the first comparator is a DC signal representative of desired power level. The other input of the first comparator is a signal having a DC component and a ripple component. The output of the first comparator is a rectangular waveform having a duty factor which is a function of the desired power level relative to the reference load power level. The first comparator output is integrated and then sup- plied as an input to the second comparator. A saw- tooth signal of constant DC level provides the other input to the second comparator. The sawtooth is a submultiple, or preferably a multiple of the AC sup- ply frequency. The output of the second comparator is another rectangular waveform, the duty factor of which is a function of the DC level of the inte- grated signal and is used to control the conduction timing of the conduction control switch. Preferably, the combined DC-with ripple-signal input of the first comparator is provided by feedback from the second comparator output which is passed through a voltage scaling network connected to an unregulated DC sup- ply. The time constants of the closed loop are se- lected to provide a temporary power overshoot when increasing the power level. Supplemental limit circuits provide limit signals directly to the second comparator input.
405326
Essex Group Inc.
Swabey Ogilvy Renault
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