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The precision of the output current of the pulse power applied to precision electroplating is an important factor that affects the quality of the plating. To accurately control the current requires precision acquisition of the power voltage in real-time. This paper introduces the hardware interface and the implementation procedures of the voltage acquisition module in detail. In the voltage acquisition module, FPGA is the main controller and the AD7888 is an analog to digital converter (ADC). They are linked by the SPI bus. The program is based on the timing of AD7888 interface. It can realize the SPI bus serial communication between FPGA and AD7888 and take up fewer resources. Based on the real-time acquisition voltage of AD7888, we choose the proper duty cycle step size in different voltage intervals by fitting the power characteristic curve, so as to achieve fast and accurate adjustment of the pulse power supply voltage.

Design of Pulse Power Supply Voltage Acquisition and Adjustment System Based on AD7888