Abstract: There is provided a matrix converter apparatus including both functions of outputting a step up voltage and outputting a step down voltage.

Abstract: A PWM cycloconverter easily capable of improving an input current waveform and regenerating energy of a snubber into a power source is provided. A PWM cycloconverter includes a PWM converter connected to a DC voltage system. An output unit of the PWM converter is connected to a place before an input filter of the PWM cycloconverter to keep down resonance of the input filter.

Abstract: The connection between the terminals of three-phase electric parts used in a matrix converter is simplified to thereby reduce the inductance between conductors. An AC capacitor (10) and an IGBT (20) are disposed such that the linearly arranged terminals (11) of the AC capacitor (10) and the linearly arranged input terminals (21) of the IGBT (20) are parallel to each other, and also that the three terminals of the AC capacitor (10) and the three input terminals of the IGBT (20) are situated close to each other. A bus bar is formed as a laminate bus bar (100) which can be provided by laminating three plate-shaped bus bars on top of each other. In the respective plate-shaped bus bars, there are provided internal terminals for connecting together the mutually adjoining ones of the three-portion terminals of the AC capacitor (10) and the three-portion input terminals of the IGBT (20), and the mutually adjoining terminals are connected together through the internal terminals.

Abstract: A control method for a PWM cyclo-converter is provided in which a voltage can be accurately generated even when a voltage command is small. In the PWM cyclo-converter, the turning on and off operations of two-way semiconductor switch are repeated at intervals of short time. As switching patterns, within the intervals of short time, a first terminal of output side terminals outputs in order a maximum potential phase P, an intermediate potential phase M and the maximum potential phase N, a second terminal of the output side terminals outputs in order the maximum potential phase P, the intermediate potential phase M, a minimum potential phase N, the intermediate potential phase M and the maximum potential phase P, and a third terminal of the output side terminals outputs in order the intermediate potential phase M, the minimum potential phase N and the intermediate potential phase M.

Abstract: It is an object of the present invention to provide a PWM cycloconverter that can compensate an error between a voltage command and a real voltage generated by a commuting operation. The PWM cycloconverter for solving the above-described problem includes: an input voltage phase detector (6) for detecting the phase of the voltage of a three-phase ac power source (1); a current direction detector (7) for detecting the direction of a current supplied to a two-way semiconductor switch (3); and a commutation compensator (11) for receiving the outputs of the input voltage phase detector and the current detector as inputs to compensate for a voltage command.

Abstract: An input voltage detection method, for a PWM cycloconverter whose operation can be stably continued though a power voltage sharply fluctuates, and an apparatus therefor are provided. For a PWM cycloconverter, provided are: an input power voltage phase detector 41, for detecting the phase of three-phase AC power; an artificial DC bus voltage detector 42, for detecting the magnitude of the three-phase AC power; an input voltage upper and lower limit calculator 43, for employing the output of the artificial DC bus voltage detector to calculate upper and lower limits for an input voltage; and a voltage comparator 46, for comparing a voltage value, detected by the artificial DC bus voltage detector, with the upper and lower limit values obtained by the input voltage upper and lower limit calculator.

Abstract: A PWM cycloconverter easily capable of improving an input current waveform and regenerating energy of a snubber into a power source is provided. A PWM cycloconverter includes a PWM converter connected to a DC voltage system. An output unit of the PWM converter is connected to a place before an input filter of the PWM cycloconverter to keep down resonance of the input filter.

Abstract: It is an object of the invention to realize a snubber module which is small in size, and which can be easily handled, thereby miniaturizing a power conversion apparatus. In the invention, a snubber module (10) is configured so that twelve snubber diodes and a snubber capacitor which constitute a snubber circuit for suppressing a surge voltage are enclosed in a resin mold (101), and a P-side lead wire (103) and an N-side lead wire (104) which are two capacitor external terminals that are connected respectively to two terminals of the snubber capacitor, and six diode external terminals (102) which are connected respectively to connecting portions where respective two of the twelve snubber diodes are connected to each other are exposed from the resin mold (101).

Abstract: It is an object of the invention to realize a snubber module which is small in size, and which can be easily handled, thereby miniaturizing a power conversion apparatus. In the invention, a snubber module (10) is configured so that twelve snubber diodes and a snubber capacitor which constitute a snubber circuit for suppressing a surge voltage are enclosed in a resin mold (101), and a P-side lead wire (103) and an N-side lead wire (104) which are two capacitor external terminals that are connected respectively to two terminals of the snubber capacitor, and six diode external terminals (102) which are connected respectively to connecting portions where respective two of the twelve snubber diodes are connected to each other are exposed from the resin mold (101).

Abstract: A PWM cycloconverter is disclosed that can switch power supplies without interrupting operation in the event of a power supply abnormality. When a power supply abnormality occurs in three-phase AC power supply 1, power supply abnormality detection circuit 30 outputs power supply abnormality detection signal 120, whereby power supply switch 20 selects and outputs the output voltage of uninterruptible power supply 10. Phase detection circuit switch 43 selects and outputs phase information that is output from uninterruptible power supply phase detection circuit 41. Uninterruptible power supply phase detection circuit 41 detects the phase of uninterruptible power supply 10 from before the occurrence of the power supply abnormality, whereby accurate phase information of uninterruptible power supply 10 can be output even immediately after phase detection circuit switch 43 switches the phase information that is output. As a result, operation is not interrupted when switching power supplies.

Abstract: A protection apparatus and a protection method of a PWM cycloconverter wherein when the PWM cycloconverter is shut off, a surge voltage or an overcurrent is not produced on the output side are provided. A protection apparatus of a PWM cycloconverter is made up of fault detection means 30 for detecting a fault of the PWM cycloconverter, operation stop means 25 for turning off at least some of the uni-directional semiconductor switches 3 to 20 of the PWM cycloconverter if a fault signal occurs, continuous flow means for allowing a load current of the PWM cycloconverter to continuously flow if at least some output phases of the PWM cycloconverter become open, and protection switching means 50 for turning on and off the unidirectional semiconductor switches of the PWM cycloconverter based on the fault signal output from the fault detection means.