Solid state relay
First Claim
Patent Images
1. A solid state relay comprising:
- an isolation transformer including a primary winding and a secondary winding;
an oscillator circuit responsive to an input signal for generating an a.c. signal, the oscillator circuit including the primary winding of the isolation transformer to form a part of a tank circuit of said oscillator circuit and consisting of a single cross-coupled, bi-stable oscillator;
a power supply transistor connected between the single cross-coupled, bi-stable oscillator and a ground terminal;
a rectifier responsive to said a.c. signal from said oscillator circuit for providing a d.c. drive signal; and
a switch circuit responsive to said drive signal opens to thereby drive a load at terminals of the switch circuit.
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Accused Products
Abstract
A solid state relay includes: an oscillator circuit responsive to a control signal for generating an a.c. signal; an isolation transformer having a primary winding which forms a part of the tank circuit of the oscillator circuit and a secondary winding; a rectifier responsive to the a.c. signal from the oscillator circuit for providing a d.c. drive signal; and a switch circuit responsive to the drive signal to open and close the relay.
47 Citations
23 Claims
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1. A solid state relay comprising:
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an isolation transformer including a primary winding and a secondary winding; an oscillator circuit responsive to an input signal for generating an a.c. signal, the oscillator circuit including the primary winding of the isolation transformer to form a part of a tank circuit of said oscillator circuit and consisting of a single cross-coupled, bi-stable oscillator; a power supply transistor connected between the single cross-coupled, bi-stable oscillator and a ground terminal; a rectifier responsive to said a.c. signal from said oscillator circuit for providing a d.c. drive signal; and a switch circuit responsive to said drive signal opens to thereby drive a load at terminals of the switch circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18, 19)
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13. A fully integrated solid state transformer isolated relay on a CMOS integrated chip comprising:
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a micro-transformer including a primary winding and a secondary winding; an oscillator circuit responsive to an input signal for generating an a.c. signal, the oscillator circuit including the primary winding of the micro-transformer, which forms a part of a tank circuit of said oscillator circuit and consisting of a single cross-coupled, bi-stable oscillator, wherein the single cross-coupled, bi-stable oscillator comprises a pair of cross-coupled transistors having a source terminal connected to a first terminal of a power supply transistor, wherein a second terminal of the power supply transistor is connected to a ground terminal; a rectifier responsive to said a.c. signal from said oscillator circuit for providing a d.c. drive signal; and a switch circuit responsive to said drive signal opens to thereby drive a load at terminals of the switch circuit, wherein the oscillator circuit, the micro-transformer, the rectifier and the switch circuit are all on a CMOS integrated circuit chip. - View Dependent Claims (14, 15)
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16. A multi-channel solid state relay comprising:
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a plurality of relay channels on an integrated circuit chip, each channel including; an isolation transformer including a primary winding and a secondary winding; an oscillator circuit responsive to an input signal for generating an a.c. signal, the oscillator circuit including the primary winding of the isolation transformer, which forms a part of a tank circuit of said oscillator circuit and consisting of a single cross-coupled, bi-stable oscillator, wherein the single cross-coupled, bi-stable oscillator comprises a pair of cross-coupled transistors having a source terminal connected to a first terminal of a power supply transistor, wherein a second terminal of the power supply transistor is connected to a ground terminal; a rectifier responsive to said a.c. signal from said oscillator circuit for providing a d.c. drive signal; and a switch circuit responsive to said drive signal opens to thereby drive a load at terminals of the switch circuit; wherein each relay channel is isolated from cross talk interference from the other relay channels by the respective isolation transformer in each of the plurality of relay channels. - View Dependent Claims (17, 20, 21, 22, 23)
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Specification