Patent ID: 6198259
Filing Date: 2001-03-06
Classification: B60L,H02J,H02M,Y02T

Abstract:
A non-insulating DC--DC converter for charging a power from a high-voltage battery to a low-voltage battery, comprising:a first semiconductor switching element for reducing a DC voltage from said high-voltage battery;a basic control circuit connected to the first semiconductor switch element for controlling pulses relative to the first semiconductor switching element;a second semiconductor switching element provided on an output side of the first semiconductor element;a capacitor connected between the first and second semiconductor switching elements in parallel; anda first control circuit connected to one end of the capacitor and an output side of the second semiconductor switching element, said first control circuit detecting a voltage at said one end of the capacitor and a voltage at the output side of the second semiconductor switching element and turning off the second semiconductor switching element if an overvoltage occurs at said one end of the capacitor.