| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source circuit which can securely generate the voltage of a high frequency in a primary coil even if the secondary coil of a transformer is connected to a display whose horizontal frequency and vertical frequency are high and which has high resolution. SOLUTION: An auxiliary coil 30 which is introduced to a primary coil 22 and whose one end is connected to a ground-side is installed. A second diode 81 connected to the other end side of the auxiliary coil 30 and a second switching element 32 are installed. A control circuit 27 switches the second switching element 32 to an OFF state while the first switching element 24 is in an ON state and switches the second switching element 32 to the ON state while current flows in the first diode 26. |
