Patent ID: 6534963
Filing Date: 2003-03-18
Classification: H02M,Y02B

Abstract:
A DC/DC converter circuit comprising a voltage conversion circuit which in active operation is able to convert the input voltage of said DC/DC converter circuit into an output voltage of said DC/DC converter circuit differing from said input voltage, a regulator circuit for regulating said output voltage to a predetermined design value, said regulator circuit comprising a reference voltage generator circuit and a comparator, at the first input of which a voltage characterizing said output voltage and, at the second input of which the reference voltage generated by said reference voltage generator circuit is available and which outputs a control signal for activating/deactivating said voltage conversion circuit as a function of MIN/MAX violation of the design value by said output voltage wherein said DC/DC converter circuit additionally comprises a circuit for signaling said regulator circuit ON/OFF comprising a comparator, at the first input of which a further voltage characterizing said output voltage and, at the second input of which a voltage at a capacitor is applied, and a control circuit comprising one or more controllable switches, said control circuit receiving said control signal of said comparator of said regulator circuit and said output signal of said comparator of said circuit for signaling the regulator circuit ON/OFF as well as outputting a signal for controlling the switch during the ON time of said regulator circuit controlling the switch so that said capacitor is connected by a voltage defined by said regulator circuit so that said capacitor charged to a voltage which differs by a predetermined amount from said voltage characterizing the output voltage, and when said capacitor signaled by said comparator of said regulator circuit that the voltage has attained the design value that outputs signal for signaling said regulator circuit OFF and controlling said switch so that said capacitor is separated from the charging voltage so that said capacitor discharged, said comparator of said circuit for signaling said regulator circuit ON/OFF outputting a signal to said control circuit when said further voltage characterizing said output voltage and the voltage across said capacitor agree, resulting in said control circuit being prompted to output the signal for signaling said regulator circuit ON.