| 摘要 |
PROBLEM TO BE SOLVED: To stop the charge of a main capacitor by using a Zener diode low in Zener voltage and low in cost. SOLUTION: An oscillation transistor 2 and an oscillation transformer 23 form an oscillation circuit, the operation of the oscillation circuit is continued to continue the charge of the capacitor 41 by the positive feedback of a transistor 24 for latch even through a stroboscopic charge switch is turned on one and immediately turned off. An oscillation stop circuit 35 is constituted of a rectifier diode 36, the Zener diode 37 whose Zener voltage is 10V, and a stopping transistor 38, etc. The diode 37 applies the Zener current by the potential difference between a fourth terminal 23d and an intermediate output terminal 23f. The potential of the terminal 23f is changed in proportion to the rising of the charge voltage of the capacitor 41, and falls in this case. When the capacitor 41 reaches a prescribed charge voltage, the Zener current flows, the transistor 38 is turned on, and the transistor 22 is turned off. Then, the transistor 24 is turned off, the oscillation operation of the transistor 22 is stopped, and the charge of the capacitor 41 is stopped. |
