Converter circuit

Application Number: 00109000
Application Date: 2000.05.26
Publication Number: 1275831
Publication Date: 2000.12.06
Priority Information: 1999/5/26 JP 146,704/99
International: H02M7/12
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd.
Inventor(s) Name: Tsujiyama Kichiro;Yoshika Kaenharu;Ueda Mitsuo
Patent Agency Code: 31100
Patent Agent: li jialin
Abstract A converter circuit has a reactor connectable to an AC power supply. It further has a PWM converter circuit connected to the reactor, the PWM converter circuit including a high speed diode, a rectifier diode and a switching element connected in parallel to the rectifier diode. The converter circuit further has an input current detector for detecting an input current of the PWM converter circuit, a DC voltage level detector for detecting an output voltage of the PWM converter circuit, a voltage polarity detector connected to the AC power supply, and a control device. The control device measures a variation period of the output voltage measured by the voltage level detector to judge a power supply frequency. It then controls the PWM converter circuit based on a power supply frequency judgement result, a detection result from the voltage level detector, an input current detected by the input current detector, and an output voltage detected by the DC voltage detector.