Current Mode Control DC-DC Converter with Single Step Load Transient Response

摘要

A power converter using constant on-time (COT) or ramp pulse modulation (RPM) control achieves more rapid resumption of steady-state operation after a step-up load transient by extending an on-time of a switching pulse by interrupting a ramp voltage waveform that is compared with a threshold that equals a threshold voltage at the termination of a switching pulse or increasing a voltage with which the ramp voltage is compared. These techniques are applied to both single-phase and multi-phase power converters.

主权项

1. A power converter comprising
a pulse generator for generating pulses for controlling connection of said power converter to a power source based on a comparison of and output voltage of said power converter with a reference voltage, a circuit for developing a control voltage corresponding to a combination of input voltage, output voltage and inductor current of said power converter, a detector for determining when said voltage corresponding to input voltage, output voltage and inductor current of said power converter represents a step-up transient, and a control circuit responsive to said detector for maintaining a switching pulse while an output of said detector indicates a step-up transient.