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Load-Independent Control of Switching DC-DC Converters With Freewheeling Current Feedback

2008; Institute of Electrical and Electronics Engineers; Volume: 43; Issue: 12 Linguagem: Inglês

10.1109/jssc.2008.2005709

1558-173X

Young‐Jin Woo, Hanh‐Phuc Le, Gyu-Ha Cho, Gyu‐Hyeong Cho, Seong‐Il Kim,

Microgrid Control and Optimization

A new control scheme of freewheeling current control is proposed for switching DC-DC converters. The output voltage is regulated by a comparator operation, and in the main current loop, the freewheeling current is feedback-controlled to a reference level in average. The converter control loop is no longer dependent on the values of the inductor, output capacitor, or the load equivalent resistance. The design of a loop compensator is therefore greatly simplified and the loop response can be very fast approaching that of a hysteresis converter. As an example, a single-inductor bipolar-output DC-DC converter with the proposed freewheeling current control is implemented in a 0.5 mum BiCMOS process. The converter has one positive output of 4 V and one negative output of -4.8 V. A maximum efficiency of 81% is achieved at a total output power of 250 mW with a switching frequency of 800 kHz.