Apparatus for controlling inverter circuit of induction heat cooker
First Claim
1. An apparatus for controlling an inverter circuit of an induction heat cooker generating and outputting a high voltage power to cook food contained in a cooking container, comprising:
- an input voltage detector for detecting an input voltage supplied to the inverter circuit from an AC power source;
a pulse width variation control signal generator for generating a control signal which controls a width of a driving pulse for driving a switching operation of the inverter circuit to be varied according to a level of the input voltage detected in the input voltage detector; and
a trigger generator for varying a turn-on time of the driving pulse according to the control signal and, simultaneously, varying a turn-off time of the driving pulse in proportion to a resonant time changed according to separation of the cooking container from the induction cooker or a state variation of heated food.
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Abstract
An apparatus for controlling an inverter circuit of an induction heat cooker which generates and outputs high voltage power to cook food contained in a cooking container is disclosed. The apparatus varies a pulse width of high level interval of a driving pulse according to a level of AC power supplied thereto to vary a switch current of the inverter circuit, and sufficiently secures a turn off time of the driving pulse in proportion to a resonant time varying according to states of separation of the cooking container or the heated food. Therefore, the apparatus improves stability of the switching operation and endurance. Also the apparatus requires relatively low manufacturing costs as the trigger generation is implemented with relatively low-priced amplifiers.
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Citations
15 Claims
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1. An apparatus for controlling an inverter circuit of an induction heat cooker generating and outputting a high voltage power to cook food contained in a cooking container, comprising:
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an input voltage detector for detecting an input voltage supplied to the inverter circuit from an AC power source;
a pulse width variation control signal generator for generating a control signal which controls a width of a driving pulse for driving a switching operation of the inverter circuit to be varied according to a level of the input voltage detected in the input voltage detector; and
a trigger generator for varying a turn-on time of the driving pulse according to the control signal and, simultaneously, varying a turn-off time of the driving pulse in proportion to a resonant time changed according to separation of the cooking container from the induction cooker or a state variation of heated food. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification