发明名称 BASE DRIVE CIRCUIT OF TRANSISTOR INVERTER
摘要 PURPOSE:To improve the reliability by connecting a base of a PNP transistor (TR) to a collector of a photo TR so as to eliminate a diode thereby avoiding a detour to a base of an NPN TR. CONSTITUTION:When an output of a control section 7 is turned on, a photo LED11 of a photocoupler 10 is lighted and a photo TR12 is turned on. A base current of the 2nd PNP TR19 flows in this case, the TR19 is turned on and a base current of the 1st NPN TR14 flows and then the TR14 is turned on at the same time. Thus, the current flowing to the 1st resistor 17 flows from the collector of the 1st NPN TR14 to the emitter, does not flow to the base of the 3rd NPN TR18 and then the TR18 is turned off. That is, when an output of the control section 7 is turned on, the 2nd PNP TR19 is turned on, and the 3rd NPN TR18 is turned off. Further, a current limited by a resistor 21 flows to the base of a main circuit TR3 so as to turn on the main circuit TR3.
申请公布号 JPS607225(A) 申请公布日期 1985.01.16
申请号 JP19830114546 申请日期 1983.06.24
申请人 MATSUSHITA REIKI KK 发明人 HIROSE KENJI
分类号 H03K17/04;H03K17/60;H03K17/795 主分类号 H03K17/04
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