A vacuum pump (1) includes a housing (2) in which a suction inlet opening (5) is defined. A vibration absorber (7) includes a suspension body (8) and an absorber jacket (9). The housing (2) of the vacuum pump (1) is connected directly to one end of the suspension body (8) in vacuum-tight connection and an opposite end of the suspension body carries a connecting port (14). By connecting the suspension body directly with the housing without mechanically releasable interconnection elements, the ove...

A system and method for reducing harmonics in a circuit is disclosed. The system comprises a main rectifier, ##EQU1## auxiliary rectifiers connected to the main rectifier, and an autotransformer connected to both the main rectifier and the auxiliary rectifiers which provides 2n-pulse rectification where n equals the number of phases of the system. The autotransformer generates ##EQU2## auxiliary voltage sets, each auxiliary voltage set having an auxiliary voltage amplitude, k, and an auxiliary v...

A power converter using a switching signal having at least three levels of amplitude, one of which amplitude levels has a zero amplitude level during a predetermined switching interval, is provided. The power converter includes a circuit module having first and second input terminals for receiving the switching signal. The circuit module in turn is made up of a first power transistor and second power transistor. Circuitry is electrically coupled to a predetermined one of the power transistors fo...

A power regulating system for a portable engine powered AC-DC-AC electric generator system wherein an auxiliary generator winding powers voltage regulation and frequency determining circuitry and controls a thyristor bridge circuit employed for rectifying the output of a three-phase primary winding of the generator.

A switching power supply comprises one or more switching sections which repeat ON/OFF operation, a transformer having a primary winding and a secondary winding, a synchronous rectifier section for rectifying a voltage induced in the secondary winding when an input voltage is applied to the primary winding of the transformer by the switching section, a smoothing section for smoothing the voltage rectified by the synchronous rectifier section to obtain an output voltage, a PWM control circuit whic...

A power converter that includes a transformer, a bridge input circuit, a self-driven synchronous rectifier circuit, a gate drive circuit, and a gate drive shutdown circuit. The transformer includes a primary winding connected to the bridge input circuit, a first secondary winding, and a second secondary winding. The self-driven synchronous rectifier circuit is connected to the first secondary winding and includes a first synchronous rectifier for rectifying a voltage across the first secondary w...

An automatic transfer switch (ATS) system and method of operating an ATS system are disclosed. The ATS system includes at least one input port capable of being coupled to at least one power source to receive an input power, a first internal component that requires internal power satisfying a first criterion in order to properly operate, and a power converter such as a switch mode power supply that is coupled to the first internal component and to the at least one input port. The power converter ...

A drive circuit for a synchronous rectifier has a transformer having a main secondary winding and an auxiliary secondary winding. A first switch and a second switch each have a pair of terminals, a terminal of the first switch being connected to the first end of the main winding, a terminal of the second switch being connected to the second end of the main winding, and each remaining terminal of the first and second switch being connected together. A third switch connects between the second end ...

In a Dickson type charge pump in which a plurality of serially connected diodes sequentially respond to anti-phase 50/50 clock cross over or overlapped (.phi.1, .phi.2), efficiency of the charge pump is increased by providing with each diode a charge transfer transistor in parallel therewith between two adjacent nodes, and driving the charge transfer transistor to conduction during a time when the parallel diode is conducting thereby transferring any residual trapped charge at one node through t...

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...