| 摘要 |
PROBLEM TO BE SOLVED: To prevent an inrush current through a main transistor when starting a power source circuit. SOLUTION: A transistor 3 for a constant voltage output and a by-pass resistor 4 are parallely connected to the output of the rectifier circuit 2 of a power source part 1, and a voltage control circuit 6, the horizontal oscillation circuit 7 of a deflection circuit and a flyback transformer 8 are connected to the output of the transistor 3. The output of the voltage control circuit 6 is connected to the base side of the transistor 3, and an output voltage equal to the operation voltage level of the transistor 3 among the low-voltage-side output of the flyback transformer 8 is connected to the base side of the transistor 3. Thus the output of the rectifier circuit 2 is given to the horizontal oscillation circuit 7 through the by-pass resistor 4 at the time of supplying power and the flyback transformer 8 is boosted along the oscillation start of this horizontal oscillation circuit 7. Then after the low-voltage output of this flyback transformer 8 is supplied to the base side of the transistor 3, the output of the voltage control circuit 6 is introduced to the base side of the transistor 3. |
