公开(公告)号：US06576885B2

公开(公告)日：2003-06-10

申请号：US09927382

申请日：2001-08-13

Applicant: Yuan-Jui Fang

Inventor： Yuan-Jui Fang

IPC: H01J4014

CPC classification number: H03K17/04123 ,  H03K17/785

Abstract: A charging/discharging circuit comprises a PNP transistor controlled by a diode, an NPN transistor arranged on a discharging path and controlled by at least one photodiode, and a capacitor arranged between a photodiode and the NPN transistor. During charging stage, a charging current flows through the diode to produce a voltage drop, which cuts off the transistors to prevent leakage current. The photodiode generates a photo current such that the capacitor presents a negative voltage on one contact thereof, which facilitates the discharging process.

Abstract translation: 充电/放电电路包括由二极管控制的PNP晶体管，布置在放电路径上并由至少一个光电二极管控制的NPN晶体管，以及布置在光电二极管和NPN晶体管之间的电容器。 在充电阶段，充电电流流过二极管以产生电压降，从而切断晶体管以防止漏电流。 光电二极管产生光电流，使得电容器在其一个触点上呈现负电压，这​​有利于放电过程。