A power supply is described for an electron gun employed in an electron beam furnace system wherein the gun current is susceptible of rising upon the occurrence of an arc. Switching means including at least one transistor are coupled between the current source and the electron gun. The current through the transistor is sensed and control means operate to disable the transistor upon a rise in the current due to an arc.

A power supply includes a housing having a bottom, a partition at the bottom of the housing extended perpendicular to the bottom of the housing as seen in longitudinal direction of the partition subdividing the housing into first and second spaces, electronic modules including switching and control stages exclusively disposed in the first space and at least one other module disposed in the second space, a power transformer fastened to the partition, extended through an opening formed in the part...

A voltage supply for a servomotor (9) is effected via a wiper (10) which slides on two conductive paths (5, 6) which are displaceable in longitudinal direction. The conductive paths (5, 6) have, at their opposite ends, a driver (15, 17) against which the wiper (10) can come in its end positions upon further displacement, in order to be able to carry the corresponding conductive path (5, 6) along with it. Directly before the driver (15, 17) is reached, no voltage is tapped off from the correspond...

In a power supply consisting of parallel-connected converters, each of the converters includes a current sensor. One terminal of each current sensor is connected to one terminal of each of the other current sensors. The other terminal is connected to the converter's pulse-width modulator through a limiter. If any of the converters fails, the limiter ensures that only a small, limited change occurs in the output voltages of the other converters which is permissible in most cases.

A plurality of different materials which are required for use in a process and which are to be kept separate up to a predetermined stage in the process are supplied with each different material being encapsulated within a plurality of discrete shells, the shells serving to keep the different materials separate from each other. The shells for the different materials are distinguishable from each other so as to permit subsequent sorting of the shells into batches of shells all containing the same ...

A power supply for driving one or more loads includes a DC voltage source, an inverter connected to the DC voltage source for providing a high frequency AC voltage at its output end, and an output transformer having a primary winding and a secondary winding. The primary winding is coupled to the output end of the inverter through a tuning inductor, while the secondary winding is coupled to the load. A tuning capacitor, which constitutes a resonant circuit in cooperation with the resonance induct...

A power supply which incorporates a high frequency inverter and which is suitable for use in conjunction with a florescent lamp. The power supply comprises a full wave rectifier (10) and a reservoir capacitor (12) connected across the rectifier for the purpose of providing successive half-cycles of the voltage waveform V2 across the capacitor with a minimum instantaneous voltage level greater than zero. A solid state switching device (14) and an oscillator (15) are connected in circuit with the ...

A power supply for use in electronic apparatuses is disclosed, and the power supply is provided with a switching control circuit for controlling the switching operations of a switching device of a rectifying portion, thereby making the switching device more efficiently operate. In the case where an over-voltage is supplied, the switching device is prevented from being damaged. There is added a tertiary coil in the transformer for inducement of a voltage, and a switching circuit is added to it, s...

A micro processor controlled system is provided for supplying electrical power to a plurality of electrical outlets for example for use in a parking lot. A central power supply communicates with a series of outlet receptacles each arranged to supply electrical power. Each receptacle has its own micro processor controlled control unit which is arranged to control the supply of power to the receptacle. A detector unit detects the insertion of a connector plug to the receptacle and actuates a compa...

A supply circuit for an apparatus which is provided with a supply voltage which is low relative to the amplitude of a main voltage supplied from a main power supply network. The switching apparatus has a switching line arranged in the main power supply line, which is connected in series with a load, and in which the supply circuit is connected in parallel with a power-dissipating or resistance element connected in series with the load.