The invention discloses a current source, the external telephone for video terminal comprises a switch circuit unit, the switch unit circuit for current source circuit is switched on or off; a booster circuit unit, the unit of voltage boost circuit for switch circuit unit output in ascension; voltage filter circuit unit, the regulator filter circuit unit for filtering the voltage regulator and current regulator after promotion; unit, the current regulating circuit unit for voltage regulator and filter after adjustment for the current source and output. The current source used for the domestic and overseas telephone of the visual terminal can satisfy the working requirements of the external telephone, and has the advantages of simple circuit structure, easy realization, high reliability and excellent cost performance.
【技术实现步骤摘要】
【技术保护点】
１．一种用于可视终端中外接电话机的电流源，其特征在于，包括：开关电路单元，该开关电路单元用于电流源电路的导通或断开；升压电路单元，该升压电路单元用于对开关电路单元输出的电压进行提升；稳压滤波电路单元，该稳压滤波电路单元用于对提升后的电压进行稳压及滤波；电流调节电路单元，该电流调节电路单元用于将稳压及滤波后的电压调节为电流源并输出。
【技术特征摘要】
【专利技术属性】
技术研发人员：贺晓华，庞潼川，陈国文，
申请(专利权)人：汉达尔通信技术北京有限公司，
类型：发明
国别省市：11
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