| 摘要 |
PROBLEM TO BE SOLVED: To prevent uneven magnetization with a simple circuit configuration by connecting a capacitor between a contact between capacitors and a primary side mid-point of a transformer. SOLUTION: A tap C is provided at a position, where is 1/2 of a winding is provided at a primary winding of a transformer 8, and a capacitor 13 is newly interposed between the tap C and a connecting point D of the capacitors 2, 3. With such a configuration, tap voltages of the start and end of the winding of the transformer 8 at the time of turning off all transistors 4, 5, 6, 7 are stabilized at half voltage (E/2) of an input voltage. Thus, the tap voltages of the transformer 8 are stabilized at the voltage of the point D by the capacitor 13, inserted between the point D of the capacitors 2, 3 and a mid-point of a primary side of the transformer 8, when the transistor 4, 5, 6, 7 are turned off. Therefore, entire switching operation can be stabilized, and uneven magnetization or saturation of the core of the transformer can be prevented. |
