| 摘要 |
PURPOSE:To miniaturize a transformer using a small size circuit at low cost by adding a resistor and keeping the output current of a constant voltage output circuit constant. CONSTITUTION:A resistor 31c is additionally put in a control circuit 31. When a heating signal is sent to an input circuit 29, the signal is sent to the control circuit 31 and successively sent to a driving circuit 26, a fan motor driving element 28, and a display circuit 30. In the circuit 26, a switching element 25 is driven by high frequency pulse to apply high frequency current to a heating coil 23 and heat a load. In the element 28, a fan motor 27 is driven to cool heat generating parts such as the element 25. In the display circuit 30, the heating output, etc., are displayed. The total value of consumption current for each part in the waiting mode and the heating mode, that is the output current of the constant voltage output circuit 32c is made equal by a correcting means 31a. Consequently, owing to the addition of the resistor 31c, the output current of the circuit 32c can be kept constant and without increasing the withstand voltage of the circuit 32c, a compact size transformer 32a at low cost can be used. |
