Direct current power supply for use in series with a load in an alternating current circuit
First Claim
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1. A direct current power supply comprising:
- a switching element;
first and second nodes for connection into an alternating current line that are selectively connectable by the switching element;
a unidirectional current path connecting the first and second nodes parallel to the switching element;
an intermediate direct current output node in the unidirectional current path; and
a voltage regulating element connected to the intermediate direct current output node and responsive to a first voltage level on the intermediate direct current output node for turning the switching element on and to a second voltage level on the intermediate direct current output node for turning the switching element off in an active alternating current line.
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Abstract
A DC power supply for an electronic switching element connected in series with a load in an AC main has a rectifying element and a capacitor parallel to the electronic switching element. Charging of the capacitor is provided by opening the switching element and diverting current from the AC main through the rectifying element and capacitor. The voltage difference across the capacitor powers control circuitry for the electronic switching element. Hysteresis built into the control circuitry results in the electronic switching element opening at a lower voltage difference across the capacitor than the voltage difference required to close the electronic switching element.
20 Citations
13 Claims
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1. A direct current power supply comprising:
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a switching element; first and second nodes for connection into an alternating current line that are selectively connectable by the switching element; a unidirectional current path connecting the first and second nodes parallel to the switching element; an intermediate direct current output node in the unidirectional current path; and a voltage regulating element connected to the intermediate direct current output node and responsive to a first voltage level on the intermediate direct current output node for turning the switching element on and to a second voltage level on the intermediate direct current output node for turning the switching element off in an active alternating current line. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A direct current power supply comprising:
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first and second nodes for connection into an alternating current main line; means responsive to a switching signal for selectively connecting the first and second nodes; a unidirectional current path between the first and second nodes; an intermediate direct current output node in the unidirectional current path; means for regulating voltage on the intermediate direct current output node by drawing current from the intermediate node; and the means for regulating voltage including means responsive to the current drawn from the intermediate direct current output node rising to a first threshold for generating a switching signal for closing the means for selectively connecting the first and second nodes and further responsive to the current drawn falling to a second threshold for opening the means for selectively connecting the first and second nodes. - View Dependent Claims (9)
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10. A direct current power supply comprising:
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an electronic switch in series with a load in an alternating current main; means for storing energy connected in parallel with the electronic switch; means responsive to a first energy level stored in the means for storing energy for turning the electronic switch off; and means responsive to a second energy level stored in the means for storing energy for turning the electronic switch on. - View Dependent Claims (11, 12, 13)
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Specification