An improved inductor for a DC link that has an auxiliary winding for inducing an opposing magnetic field in a magnetically permeable core with an auxiliary DC current that opposes a magnetic field that a primary winding for the inductor induces along a magnetic path in the core with a DC component of current to reduce magnetic saturation of the inductor due to the DC component.

Disclosed is a three phase AC power regulator using a single power modulating element. The element may be operated class A or in switching mode. A transformer primary is connected in Y configuration with the common junction being made through a 6 diode bridge and the single control element. The single control element thereby controls the common current in all three sections of the transformer primary. The transformer secondary windings are coupled to a second 6 diode bridge to produce a DC volta...

A drive circuit for driving a rectifier switch, a method of driving the rectifier switch and a power converter employing the drive circuit or the method. In one embodiment, the drive circuit includes (1) a blocking diode couplable to a bias energy source and configured to block reverse current flow thereto, (2) an inductor coupled to the rectifier switch, and (3) a switching circuit, coupled to the blocking diode and the inductor, configured to: (3a) resonantly transfer energy from the bias ener...

The present invention relates to a circuit for reducing standby power by converting low power outputted from an AC power supply into DC power. The standby power redundancy circuit of the invention reduces standby power by receiving AC power through a reactance device, receiving remote control data from a remote control, connecting a microcomputer for exclusive use for a standby power supply to a first side of an AC power supply, and then reducing the power consumption of a main microcomputer of ...

A rectifier unit for 3-phase a.c. to d.c. conversion is of the type having a transformer with a star-connected and a delta-connected secondary the outputs of which are rectified and combined to give 12-pulse operation. To reduce the danger of current imbalance between the two secondaries, a compensating transformer unit is interposed between the secondaries and the rectifiers which modifies the signals such that any difference in the current drawn from one secondary compared with the other tends...

A circuit having voltage regulated DC-output is provided, which may have balanced DC voltages with respect to zero, and which has only a single voltage sensing and power regulating means. The power regulator is on the input of a transformer having at least a bifilar wound secondary and a center tap. One or more pairs of balanced taps, one of each pair on either side of the center tap, are provided; and to each tap there is connected a pair of oppositely facing diodes, connected as to their polar...

A noise reduction circuit for a DC power supply in which the input of a high pass filter is coupled to the output circuit of the supply so as to receive a noise signal, the output of the high pass filter is coupled to the primary winding of a transformer via an amplifier, and the secondary winding of the transformer is coupled to the output circuit of the supply so as to reduce the noise therein.

A coupled-inductor current-doubler topology for a power converter has first and second rectifiers and first and second coupled inductors. Each coupled inductor has a main inductor inductively coupled with a secondary inductor. The secondary inductor of the first coupled inductor is coupled in series with one of the first and second rectifiers and the secondary inductor of the second coupled inductor coupled in series with the other one of the first and second rectifiers.

In a DC/DC converter using an insulating transformer Tr having a center tap on the secondary side, an input choke coil L1 and an output choke coil L3 are integrated with the insulating transformer Tr, a primary coil (number of turns: 2N) and a secondary coil (number of turns: n+n) of the transformer, the input choke coil L1 (number of turns: 2N), and the output choke coil L3 (number of turns: n) are wound around a common core (magnetic core), and the coils are arranged in directions of canceling...

A power supply unit for use in a measuring instrument at a plant. An output from a current transformer mounted on a power supply line is controlled so that the range of a primary current producing a stable output is increased. The invention includes a current transformer mounted on a cable for providing power to an electric motor, and a power supply unit. The power supply unit includes a rectifier circuit, a short circuit, a reverse current inhibit element, a condenser, a voltage watching circui...