Power supply with arcing control and automatic overload protection
First Claim
1. A power supply for providing high level D.C. voltage and having automatic arcing control and short circuit protection and recovery, comprising:
- a source of low level D.C. voltage;
a step-up transformer having low voltage primary windings, wound on a ferrite rod and connected to said source of low level D.C. voltage, and secondary windings wound on said primary windings in a manner so as to effectively comprise a filter having a pass band centered at a predetermined frequency;
a voltage multiplier circuit connected between said secondary windings and an output circuit of the power supply; and
an L-C feedback loop, which includes a portion of said primary windings and a solid state switching device connected to said source of low level D.C. voltage, to provide an oscillating input voltage to said primary windings at approximately said predetermined frequency under normal load conditions in the output circuit and to automatically reduce the frequency of oscillation when shorting or arcing occurs in the output circuit.
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Accused Products
Abstract
A power supply with automatic arcing control and overload protection includes an electronic switch in an oscillator circuit with a primary winding of a step-up transformer. A high voltage, secondary winding of the transformer is loosely magnetically coupled to the primary winding. The frequency of oscillation of the oscillator circuit decreases as a load impedance across the secondary winding of the transformer decreases. In the case of arcing or shorting of an output circuit of the power supply the frequency of oscillation decreases below a pass band of the output circuit, thereby reducing the output current of the power supply.
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Citations
11 Claims
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1. A power supply for providing high level D.C. voltage and having automatic arcing control and short circuit protection and recovery, comprising:
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a source of low level D.C. voltage; a step-up transformer having low voltage primary windings, wound on a ferrite rod and connected to said source of low level D.C. voltage, and secondary windings wound on said primary windings in a manner so as to effectively comprise a filter having a pass band centered at a predetermined frequency; a voltage multiplier circuit connected between said secondary windings and an output circuit of the power supply; and an L-C feedback loop, which includes a portion of said primary windings and a solid state switching device connected to said source of low level D.C. voltage, to provide an oscillating input voltage to said primary windings at approximately said predetermined frequency under normal load conditions in the output circuit and to automatically reduce the frequency of oscillation when shorting or arcing occurs in the output circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power supply for providing high level D.C. voltage for driving an electrostatic precipitator, comprising:
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a source of low level D.C. voltage; a step-up transformer having a low voltage primary winding connected to said source of low level D.C. voltage, said low voltage primary winding being loosely magnetically coupled to a high voltage secondary winding, said primary winding having a first, feedback portion and a second, power portion, connected in series; and said secondary winding having inherent capacitance such that a circuit in which said secondary winding is connected has a predetermined resonant frequency; a voltage multiplier circuit connected between said secondary winding and an output circuit of the power supply, and an L-C feedback loop which includes said feedback portion of said primary winding and a solid state switching device connected to said voltage source to provide an oscillating input voltage to said power portion of said primary windings at approximately said resonant frequency, wherein a lowered load impedance in the output circuit is reflected through the transformer to the L-C feedback loop and reduces the frequency of oscillation of the oscillating input voltage applied to the power portion of the transformer to a frequency sufficiently below said resonant frequency to reduce the current in the output circuit to prevent overload of the power supply. - View Dependent Claims (9, 10, 11)
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Specification