Patent ID: 6492862
Filing Date: 2002-12-10
Classification: H02M

Abstract:
A voltage conversion circuit comprising:a voltage detector means which detects whether a boosted output voltage of said voltage conversion circuit is larger or smaller than a predetermined reference voltage; a clock generating means which generates a clock signal based on the result of detection by said voltage detector means; a charge-pump type voltage conversion means which produces said boosted output voltage in response to said clock signal; and a transfer control means which allows or inhibits transfer of said clock signal to said voltage conversion means depending on the result of a detection by said voltage detector means; wherein said transfer control means comprises a logic gate which receives said clock signal and a voltage detection signal showing the result of detection of said voltage detector means; wherein, when the condition of said transfer control means is changed from the inhibited condition to be allowed condition based on said clock signal outputted from said clock generating means, an operation of said voltage conversion means starts from a voltage boost sequence.