Transient protector circuit for multi-phase energized power supplies
First Claim
1. A system for protecting a direct current device connected to a multi-phase power supply comprising:
- a plurality of phase inputs for receiving each of the phases of the power supply;
a neutral input;
a positive and a negative output for connecting to the direct current device;
a plurality of impedances;
only one metal oxide varistor, the metal oxide varistor connected in series between the positive and negative output; and
a plurality of diodes providing a connection between each phase input and each phase input and the neutral input, wherein the connection passes through the at least one metal oxide varistor connected in series between the positive and negative output.
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Accused Products
Abstract
Circuits and systems are used in multi-phase power supplies for the prevention of transient currents. Phase to phase and phase to neutral metal oxide varistors (“MOV”) are replaced with a single DC power supply connected MOV. Transient currents are limited by resistors that are connected in series to each of the three phase inputs. Comprising a single DC connected MOV, protection from transients between any of the four inputs is provided. The phase to phase and the phase to neutral transient currents are routed, using diodes, through a single MOV connected between the positive and negative input terminals of the DC power supply.
79 Citations
18 Claims
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1. A system for protecting a direct current device connected to a multi-phase power supply comprising:
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a plurality of phase inputs for receiving each of the phases of the power supply;
a neutral input;
a positive and a negative output for connecting to the direct current device;
a plurality of impedances;
only one metal oxide varistor, the metal oxide varistor connected in series between the positive and negative output; and
a plurality of diodes providing a connection between each phase input and each phase input and the neutral input, wherein the connection passes through the at least one metal oxide varistor connected in series between the positive and negative output. - View Dependent Claims (2, 3, 4, 5)
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6. A method of reducing transient currents in a system, comprising:
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receiving a transient current from a multi-phase power supply at an input, wherein the input comprises a plurality of phase inputs and a neutral input;
applying an impedance to the transient current;
routing the transient current to a single metal oxide varistor; and
reducing the routed transient current at the metal oxide varistor to an acceptable level. - View Dependent Claims (7, 8, 9, 10)
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11. A circuit used to prevent transient currents, comprising:
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an input component;
an impedance component connected to the input component;
a diode network component connected to the impedance component;
a transient protection component connected to the diode network component; and
a direct current output component connected to the transient protection component. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification