Power controller

Details Power controller Power controller

2011-05-03

2011-05-03

Tso, Edward (Department: 2858)

Electric power conversion systems

Current conversion

With means to connect the input to diverse power sources

C323S300000, C363S142000

Reexamination Certificate

active

07936576

ABSTRACT:
A power controller (10) includes a controller (11) and a trigger circuit (12). When the voltage of a power supply received at terminals T1exceeds a threshold, for example 120 V RMS, reverse-connected Zener diodes Z1to Z3conduct and switch on a transistor Q1. This results in a transistor Q2being switched off and a normally open relay SW1 remaining open. The switching or triggering phase angle of a triac THY1 thus is determined by the speed at which a capacitor C4 is charged to a triggering voltage by current flowing through resistors R6, R7, R8and VR1. In this situation, the triggering phase angle is such that a 240 V AC input supply provides an effective 110 V AC output at terminals T3when VR1is at maximum power setting (zero Ohms). When the voltage of the received power supply is less than the threshold, the transistor Q1is switched off and the relay SW1is activated. This bypasses resistor R6and causes the switching or triggering phase angle to adopt a value of about zero degrees when VR1is at maximum power setting, such that the voltage of the output power supply terminals T3is substantially the same as that received at terminals T1.

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