Flash control circuit

• Main Author: SUH INH-SEOK
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2004
• Edition: 7
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

一种闪光灯控制电路。其中包括一通过升高其输入电压并通过向电容器充电此升高电压来向电灯提供电压的升压器，一检测升压器输出电压并将电压指示信号传给系统控制器的电压传感器，一根据从系统控制器发出的振荡控制信号在振荡期间向升压器输出一输入电压的振荡器，一根据系统控制器发出的灯控制信号产生一触发脉冲的触发单元，一意外亮灯防止单元，其在系统电源闭合一预定时间后为"高"电平，而在断开一预定时间前为"低"电平。硬件、控制程序和检测程序被简化。 A flash control circuit for use with a system controller is disclosed. The circuit includes a booster unit for receiving a first voltage signal and for outputting a second voltage signal to a lamp. The booster unit boosts the first voltage signal and then charges the boosted first voltage signal. Also included is a voltage sensor for sensing the voltage of the second voltage signal and for transmitting a voltage indication signal to the system controller. An oscillator outputs the first voltage signal according to an oscillation control signal from the system controller, and a triggering unit generates a trigger pulse according to a lighting control signal output from the system controller. The circuit further includes an accidental lighting prevention unit coupled to the triggering unit. The accidental lighting prevention unit disables the lighting control signal for a first period of time after a system power signal has been switched on and disables the lighting control signal for a second period of time before the system power signal has been switched to an OFF state.