Primary and secondary regions are electrically insulated from each other. The first and second pulse transformers are provided to the respective transistors in the switching circuit. Secondary windings of the first and second pulse transformers are connected to control terminals of the transistors. The control circuit supplies switching voltages to primary windings of the pulse transformers based on a feedback signal fed back through a feedback line. A primary winding of a transformer, the switc...

A self-commutating inverter supplies controllable frequency power to a load. The load, which may be a simple induction motor or the like, has plural load windings which may be arranged in two groups so that a load winding in one group has a complementary load winding in another. Thyristors are associated with each of the complemented load windings and the thyristors of each group of load windings are capacitively coupled. A DC potential is applied to the inverter by a pair of terminals. As diffe...

The present invention relates to an inverter and a method for converting direct current voltage to alternating current. The inverter comprises a first input arranged to be connected to the ordinary current supply system of a vessel, where the current supply system comprises a generator connected to a battery, and an output, and an output arranged to be connected to an alternating current motor, where, for at least a period of time, the alternating current motor requires a first torque M.sub.1 in...

An inverter including a manual torque boost mechanism for outputting a constant voltage/frequency pattern by manually setting a constant voltage corresponding to a constant frequency regardless of the magnitude of a current value of a drive power supplied to a rotation drive apparatus such as a motor and an auto boost mechanism operative based on the constant voltage/frequency pattern set by the manual torque boost mechanism for automatically correcting the voltage/frequency pattern according to...

An inverter for transforming a d.c. current to an a.c. current comprising, a switching transistor and an output transformer having a primary winding connected to the collector of the transistor, a current transformer having a primary winding connected to the primary winding of the output transformer and a secondary winding connected to the base of the switching transistor, a coupling capacitor inserted between said base of the transistor and the secondary winding of the current transformer, a ca...

An inverter comprising main controlled rectifiers arranged in a 3-phase bridge configuration, shunted by reverse-conducting diodes and connected to a main D.C. source, a switching circuit comprising a switching capacitor and a switching choke coupled into a series string, auxiliary controlled rectifiers interconnected so that one end of said string is connected to three groups of said auxiliary rectifiers in mutual parallel opposition, each said group being coupled with one of the arms of the br...

In a system for the conversion between DC power and AC power, including a buffercapacitor and a controllable converting arrangement, said conversion is controlled by a power control quantity that in turn depends on a first component assuring a balance between DC power and AC power and a second component indicating a change in energy stored in the buffer capacitor on a predetermined sampling time instant in the cycle of the voltage ripple on the buffer capacitor.

DC/DC converters arranged side by side have first output terminals conducting to one pole of capacitors for rectification, second output terminals conducting to the other pole of the capacitors, and connection terminals disposed next to the second output terminals. The first output terminals are connected together by an I-shaped bus bar of copper or the like fastened thereto with screws. The second output terminals are connected together by one linear portion of a U-shaped bus bar fastened there...

An inverter has a measuring part that measures an operating time such as the time interval from when a command to start a specified operation by an associated system until a signal indicating the completion of the operation is received. A comparing part compares this measured operating time with a threshold value stored in a memory and an abnormal condition is reported to a host system, depending on the result of the comparison.

An inverter is formed of at least one connection group which is connected to and arranged to be fed from a DC source. Such connection group includes two controlled main rectifiers connected in series with each other between the poles of the DC source, with their connection point forming the output terminal for the output voltage. The rectifiers are ignited alternately. There are also two controlled commutating rectifiers forming in series with each other a part of a connection between the two po...