Patent ID: 7808186
Filing Date: 2010-10-05
Classification: H05B,Y02B

Abstract:
1. A power supply apparatus for an arc-generating load, comprising: an input-side rectifier adapted for connection to an AC power supply; a high-frequency converter for converting an output of said input-side rectifier to a high-frequency signal; a transformer having a primary winding receiving the high-frequency signal from said high-frequency converter and having a secondary winding in which a voltage-transformed version of said high-frequency signal is developed; an output-side rectifier for rectifying the voltage-transformed high-frequency signal from the secondary winding of said transformer for application to said arc-generating load; an igniter including an ignition transformer, said ignition transformer having a secondary winding having one end connected to said output-side rectifier and having the other end adapted for connection to said arc-generating load and having a primary winding in which a pulse is supplied for a short time period from a pulse generator; a controller for controlling at least said high-frequency converter; and an auxiliary power supply for driving said controller; said auxiliary power supply including an auxiliary power supply transformer, said auxiliary power supply transformer being provided with an arc-sustaining secondary winding for providing arc-sustaining current, the arc-sustaining current being supplied from said arc-sustaining secondary winding to a junction of said output-side rectifier and said secondary winding of said ignition transformer.