Patent ID: 8892202
Filing Date: 2014-11-18
Classification: A61N,H01L

Abstract:
1. A current stimulator comprising: a high voltage output module including a plurality of transistors stacked together, receiving an input control signal and a first voltage, wherein voltages output by all said transistors are added to said first voltage to form a second voltage; a voltage control module electrically connected with said high voltage output module and outputting a voltage control signal for providing a stable stimulus current for a load according to said second voltage and variation of impedance of said load; and a charge pump module electrically connected with said high voltage output module and said voltage control module, receiving said voltage control signal, and regulating said first voltage supplied to said high voltage output module; wherein said charge pump module further comprises a second voltage division unit, a switch, a charging unit, a voltage feedback unit, a voltage output comparator and a clock control unit, and wherein said second voltage division unit is connected with a voltage supply module and receives a supply voltage from said voltage supply module, and wherein said switch selects one of divisional voltage levels of said second voltage division unit as a selected divisional voltage level according to said voltage control signal and outputs said selected divisional voltage level to said voltage output comparator, and wherein said voltage feedback unit feeds back said first voltage as a feedback voltage to said voltage output comparator, and wherein said voltage output comparator compares said feedback voltage and said selected divisional voltage level and outputs a comparison control signal to said clock control unit, and wherein said clock control unit controls said charging unit to operate according to said comparison control signal and a clock signal.