| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a DC-DC converter which can cope with both of the frequency intervals of carrier waves for broadcasting of an AM radio divided into two of 9 kHz and 10 kHz, and a vehicle device using the DC-DC converter. SOLUTION: The DC-DC converter 1 is equipped with a transformer T1 which insulates a DC power source and a load from each other, field effect transistors S1 and S2 which are connected between the primary side of the transformer T1 and the power source and repeat the continuity and break, answering a switching signal, a controller U1 which generates a switching signal for controlling the action of the continuity and break of the field effect transistors S1 and S2, and diodes D1 and D2 which regulate the voltage induced on the secondary side of the transformer T1 into DC and output DC voltage. The controller U1 generates a switching signal of 90 kHz the same as a common multiple between 9 kHz in carrier frequency interval and 10 kHz in carrier frequency interval, and controls the action of the make and break of the field effect transistors S1 and S2.</p> |
