本論文使用可規劃邏輯陣列(FPGA)設計一個可應用於鋰離子電池開發之恆電流儀。文中所設計的鋰離子電池恆電流儀可以設定不同大小的電流進行充放電:0.2C、0.5C充放電電流。所提出之恆電流儀是由一個FPGA、三個運算放大器(OPA)、一個12bit的數位類比轉換器(DAC)、一個12bit的類比數位轉換器(ADC) 、一個差動放大器電路及充放電電路、一個RELAY、一組110V轉12V變壓器、兩組npn型BJT以及兩組pnp 型BJT所組成。其中FPGA是用來控制DAC、ADC、以及RELAY的電阻選擇，DAC是用來產生差動放大電路所需要的激發信號，此定電流將透過運算放大器之回授電路流經電池，進行充電或是放電，鋰離子電池電壓則透過ADC進行量測用以監測電池之狀態，此電池電壓將經由FPGA傳送到個人電腦，並將充放電狀況呈現在LABVIEW。

In this paper, a Galvanostat designed by field programmable gate array (FPGA) is proposed for Lithium-Ion batteries development. The proposed Galvanostat can be acted as a constant current analyzer for charging and discharging battery under different currents: such as 0.2C, or 0.5C corresponding to battery specification. The proposed Galvanostat consists of an FPGA, three operational amplifiers(OPA), a 12-bit digital-to-analog converter (DAC), a 12-bit analog-to-digital converter (ADC), a differential amplifier circuit, a RELAY switch, and two sets of NPN BJTs and two sets of PNP BJTs. The FPGA is used to control DAC and ADC, and control the RELAY to select the resistor for the current converter. According to setting charging or discharging current, DAC will be programmed to generate the excitation signal to the differential amplifier circuit. In the meantime, the RELAY switch will be set on, and the current converter resistor will be selected. The charging or discharging current will flow through the battery based on the feedback circuit of operational amplifiers. The BJTs are used as a current buffer for large charging or discharging currents. The Lithium-Ion battery voltage is measured by ADC to monitor the state of the battery. The battery’s voltage will be sent to the personal computer through the FPGA, and the charging and discharging status will be displayed on the LABVIEW.