Patent ID: 7110271
Filing Date: 2006-09-19
Classification: H02M,Y10S

Abstract:
1. An inrush current prevention circuit for a DC-DC converter, comprising: a switching element that transforms an input voltage by being switched on and off and outputs the transformed voltage; a filter for the outputted voltage, transformed via the switching element, and outputs the filtered voltage as an output voltage; a reference voltage generator that generates a reference voltage; an error amplifier that compares the reference voltage and output voltage and outputs an error signal; a Pulse Width Modulation (PWM) signal generator that generates a PWM signal to switch on and off the switching element according to the error signal; an on-off circuit that transmits or isolates the PWM signal to the switching element; and an Electronic Control Unit (ECU) that controls the on-off circuit, wherein the ECU determines a delay period of time according to the input voltage and output voltage by using a pre-estimated map table and actuates the on-off circuit after the delay period of time, and wherein the ECU determines a reference error value according to the input voltage and output voltage based on a preset map table and activates the on-off circuit when the error value of the error signal inputted from the error amplifier is greater than or equal to the reference error value.