Mitsubishi Denki Kabushiki Kaisha

Taro Ando

Shigemi Kuriyama

Akinori Nishihiro

Masakatu Daijyo

Katsushi Ikeda

Satoshi Azuma

Eiichi Sugishima

Akira Imanaka

Yoichi Goto

Yohichi Goto

Power converting apparatus with drive signal path impedance increasing

A control board includes a plate 7 for the control board including a first printed board for mounting a control section 56 and a first connecter 9; and a removable terminal stand plate 1 including a second printed board for mounting a terminal stand 3, input circuit section 4 and output circuit section 5, and a second connector. The first and second connectors are connected to each other.

Control board system including a removable terminal stand which can

A power converting apparatus is comprised of an inverter unit arranged by a switching semiconductor element 51a for an upper arm and another switching semiconductor element 51d for a lower arm, and for turning ON/OFF the switching semiconductor elements to thereby convert DC power inputted from a DC power supply into AC power; and control means 10a for judging as to whether or not an abnormal operation is present based upon an output of a comparator 11a for judging as to whether or not a detection voltage detected by a voltage detecting circuit 61 is substantially equal to a voltage of the positive polarity; an output of a comparator 11b for judging as to whether or not a detection voltage detected by the voltage detecting circuit 61 is substantially equal to a voltage of the negative polarity; and an output signal of an igniting signal for ON/OFF-controlling the switching semiconductor elements, this voltage detecting circuit 61 detecting an output voltage of the inverter unit via a voltage dividing resistor, while using as a reference a potential at the positive polarity of the DC power supply, or a potential at the negative polarity thereof.

Power converting apparatus

Control device for a PWM controlled converter having a voltage controller

An apparatus and method for detecting a ground fault occurring on an output side of an inverter circuit, which includes a converter circuit for rectifying an alternating current into a direct current, a capacitor for smoothing the direct current, an inverter circuit for converting the smoothed direct current into a predetermined frequency and voltage through the on/off operation of switching elements connected in parallel with diodes, and a PWM signal generator for controlling the on/off of the switching elements. The ground fault detector includes current detectors for detecting current flowing in the switching elements, a device for detecting an overcurrent flowing from one of the switching elements and for outputting an overcurrent signal when the output of any of the current detectors exceeds a predetermined value, a device for detecting a zero vector signal transmitted by the PWM signal generator, and a ground fault detector circuit for detecting a ground fault condition in accordance with the overcurrent signal and the zero vector detection signal.

Ground fault detector for an inverter and a method therefor

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Tokyo, Japan

Taro Ando