Inverter device for induction heating
First Claim
1. An inverter device for induction heating, comprising a bridge inverter having a pair of series-connected switching elements connected to a DC power source and having an output obtained from a junction between said switching elements, a circuit for detecting the turn-off of said switching elements comprising a voltage comparator having one input terminal connected to said junction and another input terminal connected to said DC power source wherein said turn-off is detected when the voltages at said one and another input terminals become equal, and a timing circuit and a flip-flop circuit which are connected to an output of said turn-off detection circuit, the arrangement being such that after the turn-off of one of said switching elements has been detected, the other switching element is driven.
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Accused Products
Abstract
An induction heating device makes use of a bridge inverter and has a DC power source, a plurality of switching elements forming a bridge inverter, and a circuit for detecting the turn-off of the switching elements. In order to detect the turn-off of the switching elements, an improved turn-off detection circuit is employed and an improved control circuit is installed to prevent the circuit from malfunctioning owing to external noise.
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Citations
2 Claims
- 1. An inverter device for induction heating, comprising a bridge inverter having a pair of series-connected switching elements connected to a DC power source and having an output obtained from a junction between said switching elements, a circuit for detecting the turn-off of said switching elements comprising a voltage comparator having one input terminal connected to said junction and another input terminal connected to said DC power source wherein said turn-off is detected when the voltages at said one and another input terminals become equal, and a timing circuit and a flip-flop circuit which are connected to an output of said turn-off detection circuit, the arrangement being such that after the turn-off of one of said switching elements has been detected, the other switching element is driven.
Specification