INDUCTION HEATING DEVICE

• Main Authors: FUJITA ATSUSHI, YAMASHITA HIDEKAZU, HIROTA MOTONARI
• Format: Patent
• Language: English
• Published: 21.05.1999
• Edition: 6
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

PROBLEM TO BE SOLVED: To provide a safe and simple-structured heating device which can prevent a switching element from destroying without requiring any protection circuit, by providing the switching element with a self short means for causing self short at both ends' voltage over a given value. SOLUTION: A chock coil 12 is connected with a direct current power 11 in series, and its inductance is set to be less than 1 mH, for example, 300 μH. A resonance capacitor 16 is connected with a heating coil 15 in series, and these two components form a resonance circuit 20. A control circuit 17 including an oscillating circuit 19 controls a switching element 13. A self short means 18 provide the switching element with self short when voltage on the both sides of the switching element 13 becomes more than a given value (concretely, it is higher than a voltage generated during normal operation, and is lower than a withstand voltage of the switching element 13). Thus, loss of the switching element 13 is reduced, and even during abnormal time, withstand voltage destroy of the switching element 13 is prevented.