Patent ID: 7999528

Claim:
A dual mode transient recovery control method for integration to a direct-current (DC) power output unit and a load circuit, the method comprising: detecting a DC output voltage amplitude of the DC power output unit; comparing the detected DC output voltage amplitude against a set of preset threshold levels including a negative-ripple falling-edge threshold and a negative-ripple rising-edge threshold on the negative polarity of the DC output voltage amplitude, and a positive-ripple rising-edge threshold and a positive-ripple falling-edge threshold on the positive polarity of the DC output voltage amplitude; when the detected DC output voltage amplitude reaches down below the negative-ripple falling-edge threshold from steady state, performing a hysteretic mode control operation on the DC power output unit; when the detected DC output voltage amplitude reaches up above the negative-ripple rising-edge threshold after passing through the negative-ripple falling-edge threshold, performing a PWM (Pulse Width Modulation) mode control operation on the DC power output unit; when the detected DC output voltage amplitude reaches up above the positive-ripple rising-edge threshold from steady state, performing a PWM mode control operation on the DC power output unit; and when the detected DC voltage output amplitude reaches down below the positive-ripple falling-edge threshold after passing through the positive-ripple rising-edge threshold, performing a PWM mode control operation on the DC power output unit.