并且对白光led特性进行分析，设计了恒流驱动电路，保证发光质量。
And this paper analyzes the characteristic of white LED, designs constant-current drive circuit, so that guaranteeing the quality of light.
安全防护电源电路：恒流驱动电路，高标准防护系统：对过压、过热、浪涌、防雷具有良好的保护作用。
Safety protection power circuit: Constant current control circuit, high standard standard protection system: preventing high voltage, temperature, surge, lightning and so on.
驱动电路采用恒流斩波方式，提高了步进电机的运转扭矩和工作效率。
The driving circuits adopt constant current chopping for the purpose of improving rotating torque and increasing working efficiency of the stepper motor.
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