Patent ID: 7242563
Filing Date: 2007-07-10
Classification: H02M

Abstract:
1. A phase control power switching circuit for controlling the phase angle of current flow through a load from an alternating current source, the circuit comprising: a pair of voltage control switches in inverse series connection for controlling alternating current flow through the load; maximal voltage sensing means coupled to the pair of voltage control switches to sense a maximal voltage between the pair of voltage control switches; a zero crossing detection and overload protection network coupled to said maximal voltage sensing means and having the maximal voltage as an input; control means having a phase control means for selectively adjusting the phase angle to drive the pair of voltage control switches to an off condition; and pulse generator means adapted to generate a first voltage of a first value and a second voltage of a lower value wherein the second voltage can have a value of zero volts or greater and wherein the pulse generator means is coupled to drive the pair of voltage control switches from their on condition to their off condition, wherein