Patent ID: 9647556
Date: 2017-05-09
CPC Classifications: H02M

Claim:
1. A controller for a DC to DC converter, comprising: pulse width modulated (PWM) signal generating circuitry operable for generating a plurality of PWM signals phase-shifted relative to one another, and operable for controlling states of said PWM signals according to a plurality of control signals, each PWM signal of said PWM signals having an on-time state and an off-time state; ramp signal generating circuitry, coupled to said PWM signal generating circuitry, operable for generating a plurality of ramp signals having substantially the same ramp slope, each ramp signal of said ramp signals generated in response to detecting an on-time state of a corresponding PWM signal of said PWM signals; and a comparing circuit, coupled to said PWM signal generating circuitry and said ramp signal generating circuitry, operable for alternately comparing said ramp signals with a preset reference to generate said control signals, a corresponding control signal of said control signals operable for changing said corresponding PWM signal from said on-time state to an off-time state, wherein said PWM signal generating circuitry generates a plurality of trigger signals and controls said corresponding PWM signal to be in said on-time state on detection of a corresponding trigger signal in said trigger signals, and wherein each trigger signal of said trigger signals indicates a situation in which an output voltage of said DC to DC converter is less than a reference voltage.