Double solid state relay
First Claim
Patent Images
1. A zero voltage closing double solid state relay comprising:
- first and second input terminals;
first and second output terminals;
a first AC on-off circuit for selectively electrically connecting said first input terminal to said first output terminal, said first AC on-off circuit being electrically connected between said first input terminal and said first output terminal;
a second AC on-off circuit for selectively electrically connecting said second input terminal to said second output terminal, said second AC on-off circuit being electrically connected between said second input terminal and said second output terminal;
a pair of control terminals for receiving an AC or DC voltage indicative of whether said solid state relay is to be turned on;
a first control circuit for controlling said second AC on-off circuit in accordance with the presence of said AC or DC voltage across said pair of control terminals, said first control circuit being connected to said second AC on-off circuit and coupled to said pair of control terminals so as to be responsive to said pair of control terminals;
a second control circuit for controlling said first AC on-off circuit in accordance with the presence of said AC or DC voltage across said pair of control terminals, said second control circuit being connected to said first AC on-off circuit and responsive to said pair of control terminals, said second control circuit being further connected to said first control circuit; and
a zero voltage closing circuit connected to said first control circuit for enabling said first and second control circuits to control the first and second AC on-off circuits when a voltage across the first and second input terminals is close to zero.
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Abstract
A new double solid state relay comprising two sets of solid state relays and being constructed in such a way that it can turn on and off a circuit with a voltage very close to zero. It is the only solid type double solid state relay in the world and is safe enough for popular use in the industry.
21 Citations
12 Claims
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1. A zero voltage closing double solid state relay comprising:
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first and second input terminals; first and second output terminals; a first AC on-off circuit for selectively electrically connecting said first input terminal to said first output terminal, said first AC on-off circuit being electrically connected between said first input terminal and said first output terminal; a second AC on-off circuit for selectively electrically connecting said second input terminal to said second output terminal, said second AC on-off circuit being electrically connected between said second input terminal and said second output terminal; a pair of control terminals for receiving an AC or DC voltage indicative of whether said solid state relay is to be turned on; a first control circuit for controlling said second AC on-off circuit in accordance with the presence of said AC or DC voltage across said pair of control terminals, said first control circuit being connected to said second AC on-off circuit and coupled to said pair of control terminals so as to be responsive to said pair of control terminals;
a second control circuit for controlling said first AC on-off circuit in accordance with the presence of said AC or DC voltage across said pair of control terminals, said second control circuit being connected to said first AC on-off circuit and responsive to said pair of control terminals, said second control circuit being further connected to said first control circuit; and
a zero voltage closing circuit connected to said first control circuit for enabling said first and second control circuits to control the first and second AC on-off circuits when a voltage across the first and second input terminals is close to zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification