Title :
Step-up DC power supply based on a switched-capacitor circuit
Author :
Mak, On-Cheong ; Wong, Yue-Chung ; Ioinovici, Adrian
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech., Kowloon, Hong Kong
fDate :
2/1/1995 12:00:00 AM
Abstract :
A new step-up DC-to-DC power converter with high power density is presented. It contains no inductors or transformers. The controlled energy transfer from an unregulated voltage source to a regulated output voltage is realized through a switched-capacitor circuit. The operation of the switches in the power stage is dictated by a PWM-type feedback circuit. The new regulator is simulated by using an averaged state-space approach. The transient and steady-state waveforms, as well as the AC small-signal input-to-output and control-to-output transfer functions are obtained by both simulation and experiments. The power supply, implemented for a nominal power of 15 W, and input-to-output voltage ratio of 5/12, features high efficiency for this class of powers, small output voltage ripple, continuous input current, low weight and small size
Keywords :
DC-DC power convertors; PWM power convertors; circuit analysis computing; circuit testing; control system analysis computing; digital simulation; feedback; power engineering computing; power supplies to apparatus; state-space methods; switched capacitor networks; transfer functions; voltage control; 15 W; DC/DC power converter; PWM-type feedback circuit; averaged state-space approach; controlled energy transfer; input current; size; step-up DC power supply; switched-capacitor circuit; transfer functions; voltage ripple; weight; Circuit simulation; DC-DC power converters; Energy exchange; Inductors; Power supplies; Pulse width modulation; Switched capacitor circuits; Switching circuits; Transformers; Voltage control;
Journal_Title :
Industrial Electronics, IEEE Transactions on
