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110

Emulated Peak Current Mode Control

Soft Switching DC-DC Boost Converter using FPGA

Nobuhiro HINO and Takahiko IIDA*

Graduate School of Engineering,

*Department of Electrical and Electronic Engineering, Faculty of Engineering,

Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan (Received September 30, 2008; accepted November 7, 2008)

This paper explains both the new types of digitally emulated peak current mode control soft switching DC-DC converter using FPGA and also the experimental output characteristics. The newly proposed control method can adopt a reasonable speed A/D converter with such conversion rate of one MSPS instead of the ultra high speed A/D converter which is inevitably used to detect the reactor current in the converter, if the analogue-typed peak current mode control circuit is just replaced to the digitalized one with no special consideration. In the proposed control method, the reactor current is detected only once a switching cycle. The digitalized input and output dc voltages are operated with the voltage-reference signal, and generate the current-reference signal, which is compared to the emulated reactor current by the aid of FPGA digital comparator.

The implemented experimental main-circuit is the soft switching DC-DC boost converter with such ratings as input voltage of dc60V, output voltage of dc200V, output current of dc4A and switching frequency of 100kHz, which is just same as the one written in the references. In the experimental circuit, FPGA of Spartan 3 type XC3S400-4 and A/D converters of types TLV1570 and AD9215 are used as the main semiconductor devices.

It is demonstrated that the prototype circuit is stably implemented without sub-harmonic oscillation by the aid of the digital slope-compensation. The output characteristics are also included the step response from 10% to full load condition with satisfactory results.

Keywords: current mode control; DC-DC boost converter; soft switching; emulated current;

digital control; A/D converter; FPGA.

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