| 摘要 |
PURPOSE:To accomplish an induction heating cooking apparatus which performs high precision load sensing at low loss and low cost by comparing the amplitude of resonance voltage generated at No.1 and No.2 resonant capacitor with the input current from a DC power supply, and thereupon judging the load. CONSTITUTION:A DC voltage sensing part 9 senses the voltage (VD) of a DC power supply 1, while a resonance voltage sensing part 10 senses the voltage (VC) at the middle point of No.1 and No.2 resonant capacitors 5, 6, and an input current sensing part 11 senses the input current (Iin) from said DC power supply. A load sensing part 12 performs load sensing from the output signals of the named DC voltage sensing part 9, resonance voltage sensing part 10, and input current sensing part 11 and the output proportional to the continuity ratio (D) from a control part 8. A load sensing part 12 calculates VC-VD.D as the sensed voltage, and the result is compared with the input current (Iin). If the sensed voltage is greater than the judgement level, it is judged as the load is miscellaneous, and if smaller it is judged as normally loaded. |
