A circuit comprising first and second rectifiers for supplying rectified current or voltage to a storage capacitor located at the output of the circuit. The circuit includes a control circuit operatively coupled between the output and the silicon controlled rectifiers to insure that alternate ones of the silicon controlled rectifiers will supply the rectified current or voltage to the storage capacitor as needed.

The present invention relates to a power source apparatus for supplying a stabilized D.C. output to an inverter. In a D.C. power source apparatus for an inverter comprising a forward power conversion circuit receiving commercial A.C. power supply for outputting D.C. power such as a thyristor rectifying circuit and control circuit for controlling the D.C. output voltage of said forward power conversion circuit, the disclosed D.C. power source apparatus for an inverter is provided with feedforward...

A three-phase bridge rectifier system is proposed, having three rectifier paths, in which two rectifier elements at a time are in series, each rectifier path between the rectifier elements being connectible to one of three leads of a three-phase current terminal; the three cathode terminals of the rectifier elements lying opposite the three-phase current connection are connected to an positive pole, and the three anode terminals of the rectifier elements lying opposite the three-phase current co...

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 p...

Disclosed is a watercraft comprising a body; a hull constituting a lower portion of the body; a deck having deck floors formed on both sides of the body in a width direction and a raised portion at least extending from a center portion of the body to a rear end portion of the body in a longitudinal direction and being raised from center-side end portions of the deck floors on both sides in the width direction so as to form an engine room that contains the engine, the deck covering the hull from ...

The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present invention provides full control of inrush current even during cold startup, warm startup, and power line disturbance conditions. The present invention controls inrush current without the need for an extra series dissapative device and its consequent add...

A circuit is provided for use in a synchronous generator excitation system. The circuit comprises a three-phase bridge having six legs. The bridge is connected with an AC power supply. A thyristor is provided in each of the six legs, wherein the thyristors provide a path for a device current. A free wheeling diode functions as a de-excitation means connected in parallel with the three-phase bridge. The free wheeling diode provides a discharge path for a field current.

A hybrid diode/thyristor AC/DC converter includes a thyristor bridge (21) poled oppositely to a diode bridge (13), current through the thyristor bridge being controlled by IGBTs (30, 31). A thyristor turn-off circuit (40-42, 45-47) is responsive to turn-off of the IGBT to reverse bias the thyristors, thereby causing them to turn off. The thyristors and IGBTs are controlled (50) in response to voltage (55-57) of and current flowing (51-53) in the AC mains so as to cause the current flowing to or ...

An air ventilation system for a personal watercraft that includes a pair of pipes extending substantially side by side through the watercraft's hull from a first side to a second side where the pipes have an intake port located through the deck above the waterline of the watercraft and an outlet port that extends into the bottom third of the hull below the waterline.

A circuit for controlling two power transistors (24, 26) used an synchronous rectifiers in the secondary side of a switched mode power supply is provided. Current detector circuits (40, 42) measure current through parasitic diodes (28, 30) of the power transistors. It is shown that the synchronisation achieved is more accurate, and the resultant device is simpler and cheaper than previous solutions.