Two-wire switch
First Claim
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1. A two-wire switch for connecting a load to an AC voltage source comprising:
- a bridge rectifier circuit having an input coupled to said AC voltage source;
an initiator;
a semiconductor circuit connected on the output side of said bridge circuit, having an input coupled to said initiator, and having a switchable semiconductor path which can be brought into the conducting state by operation of said initiator;
controllable switch means, having a control electrode located in a control current circuit including said switchable semiconductor path, for delivering power from said AC voltage source to said load;
a capacitor coupled to said initiator to supply power thereto; and
auxiliary voltage source means, having an output coupled to said capacitor and said initiator and having an input coupled to an output of said bridge circuit to receive power therefrom, for generating a pulsating DC voltage as auxiliary voltage to power said initiator and charge said capacitor, whereby said capacitor acts as a charge storage device and powers said initiator when the pulsating DC voltage of said auxiliary voltage source is inadequate to power said initiator.
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Abstract
The invention relates to a two-wire switch for connecting a load to an ac ltage source, and, in particular, to a two-wire switch with an auxiliary voltage source. A capacitor acting as charge storage device can be charged by the auxiliary voltage source which operates on the principle of phase angle control. In accordance with the invention, a series connection comprising a threshold element which can be brought into the conducting state when there is a prescribed minimum voltage across the capacitor, and a diode is inserted into a control current circuit for a controllable semiconductor device on the input side of the bridge.
40 Citations
11 Claims
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1. A two-wire switch for connecting a load to an AC voltage source comprising:
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a bridge rectifier circuit having an input coupled to said AC voltage source; an initiator; a semiconductor circuit connected on the output side of said bridge circuit, having an input coupled to said initiator, and having a switchable semiconductor path which can be brought into the conducting state by operation of said initiator; controllable switch means, having a control electrode located in a control current circuit including said switchable semiconductor path, for delivering power from said AC voltage source to said load; a capacitor coupled to said initiator to supply power thereto; and auxiliary voltage source means, having an output coupled to said capacitor and said initiator and having an input coupled to an output of said bridge circuit to receive power therefrom, for generating a pulsating DC voltage as auxiliary voltage to power said initiator and charge said capacitor, whereby said capacitor acts as a charge storage device and powers said initiator when the pulsating DC voltage of said auxiliary voltage source is inadequate to power said initiator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A two-wire switch for connecting a load to an AC voltage source, comprising:
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an initiator; controllable switch means for delivering power from said AC voltage source to said load;
said ac voltage source, said switch means, said load and ground forming a series output circuit;a semiconductor circuit having a control input coupled to said initiator and having switchable semiconductor output path means for activating said switch means in response to a signal applied by said initiator to said control input of said semiconductor circuit; a bridge rectifier circuit having an input coupled to said AC voltage source; a capacitor coupled to a power input port of said initiator; and auxiliary voltage source means, located entirely out of said series output circuit and having an output coupled to said capacitor and said initiator and an input connected to receive current from said bridge rectifier circuit, for continuously generating a pulsating DC voltage which powers said initiator and charges said capacitor, whereby said capacitor acts as a charge storage device and powers said initiator when the pulsating DC voltage of said auxiliary voltage source is inadequate to power said initiator. - View Dependent Claims (10, 11)
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Specification