Induction heating apparatus using a pair of inversely...

Details Induction heating apparatus using a pair of inversely... Induction heating apparatus using a pair of inversely...

H - Electricity

05

B

327/26

H05B 6/06 (2006.01) H02M 5/22 (2006.01) H02M 5/27 (2006.01) H03B 9/10 (2006.01) H05B 6/68 (2006.01)

Patent

CA 1061868

ABSTRACT OF THE DISCLOSURE: An induction heating apparatus comprising a pair of inversely parallel connected gate-controlled switching devices connected to a low frequency voltage source, a commutating cir- cuit including an induction heating coil and a variable frequency gating circuit for driving the switching devices into successive conduction to generate high frequency oscillation in the induc- tion heating coil. The switching devices are driven into conduc- tion in a first order during the positive half cycle of the source voltage and in reversed order during the negative half cycle. A zero crosspoint detector is provided to detect when the source voltage is near zero voltage level for the purpose of inhibiting the gating operations to prevent misfiring which would otherwise occur. The gating frequency is varied in accordance with the instantaneous value of the source voltage for the purpose of allowing a longer turn-off time for the switching devices when the instantaneous source voltage is relatively low to assure con- tinued firing of the switching devices.

245870

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