De Lima Jader A, Cordeiro Adriano S
Electrical Engineering Department, Universidade Estadual Paulista, Guaratingueta-SP, Brazil.
IEEE Trans Biomed Eng. 2002 May;49(5):497-500. doi: 10.1109/10.995689.
A constant-current stimulator for high-impedance loads using only low-cost standard high-voltage components is presented. A voltage-regulator powers an oscillator built across the primary of a step-up transformer whose secondary supplies, after rectification, the high voltage to a switched current-mirror in the driving stage. Adjusting the regulated voltage controls the pulsed-current intensity. A prototype produces stimulus of amplitude and pulsewidth within 0 < or = I(skin) < or = 20 mA and 50 micros < or = T(pulse) < or = 1 ms, respectively. Pulse-repetition spans from 1 Hz to 10 Hz. Worst case ripple is 3.7% at I(skin) = 1 mA. Overall consumption is 5.6 W at I(skin) = 20 mA.
本文介绍了一种仅使用低成本标准高压元件的用于高阻抗负载的恒流刺激器。一个稳压器为一个跨接在升压变压器初级的振荡器供电，该变压器的次级在整流后将高电压提供给驱动级中的开关电流镜。调节稳压电压可控制脉冲电流强度。一个原型分别产生幅度在0≤I(皮肤)≤20 mA、脉宽在50微秒≤T(脉冲)≤1毫秒范围内的刺激。脉冲重复频率范围为1 Hz至10 Hz。在I(皮肤)=1 mA时，最坏情况下的纹波为3.7%。在I(皮肤)=20 mA时，总功耗为5.6 W。
