US4864126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state relay with optically controlled shunt and series enhancement circuit
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 1988-06-17
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Granted: 1989-09-05
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Expires: 2008-06-17
Abstract
Abstract A solid state relay uses an optically controlled shunt and series enhancement circuit between a photodiode array and an output device to provide enhanced turn-off and transient immunity characteristics. A Faraday shield may be used to cover optically active components and to provide protection against false turn-on and turn-off caused by the transients.
Inventors
- 👤 Michael D. Walters
- 👤 Joseph Pernyeszi
- 👤 John F. Petrilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:54
CPC Classifications
H; H01; H01H; H01H51/00; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03K17/6874; H03K17/04; H03K17/042; H03K17/04206; H03K17/16; H03K17/161; H03K17/162; H03K17/165; H03K17/78; H03K17/785
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
106 words
A solid state relay comprising: a light emitting diode connectable to a control circuit; a primary photodiode array, optically coupled to the light emitting diode across a gap, for receiving light from the light emitting diode and for generating a voltage; an output device having inputs for receiving the voltage and output terminals connectable to a switched circuit, the output device providing a low impedance path between the output terminals in an on-state and a high impedance path in an off-state; and series switch means, connected between the photodiode array and the output device, for selectably coupling or decoupling the photodiode array to the output device.
Claim 2
Dependent Claim
106 words
A solid state relay comprising: a light emitting diode connectable to a control circuit; a primary photodiode array, optically coupled to the light emitting diode across a gap, for receiving light from the light emitting diode and for generating a voltage; an output device having inputs for receiving the voltage and output terminals connectable to a switched circuit, the output device providing a low impedance path between the output terminals in an on-state and a high impedance path in an off-state; and series switch means, connected between the photodiode array and the output device, for selectably coupling or decoupling the photodiode array to the output device.
Claim 3
Dependent Claim
22 words
A solid state relay as in claim 1, wherein the series switch means is controlled by light from the light emitting diode.
Claim 4
Dependent Claim
26 words
A solid state relay as in claim 2, wherein the series switch means comprises a phototransistor optically coupled across the gap to the light emitting diode.
Claim 5
Dependent Claim
76 words
A solid state relay as in claim 2, wherein: the output device comprises an output transistor having first and second inputs for receiving the voltage; and the series switch means comprises first and second phototransistors, the first phototransistor being connected between an end of the photodiode array and the first input of the output transistor, the second phototransistor being connected between an other end of the photodiode array and the second input of the output transistor.
Claim 6
Dependent Claim
35 words
A solid state relay as in claim 4, wherein the output device comprises first and second output field effect transistors connected gate to gate and source to source, the gates and sources forming the inputs.
Claim 7
Dependent Claim
29 words
A solid state relay as in claim 1, further comprising a first shunt switch means connected across the inputs of the output device for selectably discharging the output device.
Claim 8
Dependent Claim
23 words
A solid state relay as in claim 6, wherein the first shunt switch means is controlled by light from the light emitting diode.
Claim 9
Dependent Claim
24 words
A solid state relay as in claim 7, wherein the first shunt switch means is connected to and controlled by the series switch means.
Claim 10
Dependent Claim
19 words
A solid state relay as in claim 8, wherein the first shunt switch means comprises a silicon controlled rectifier.
Claim 11
Dependent Claim
48 words
A solid state relay as in claim 1, further comprising second shunt switch means for selectably discharging the output device, the second shunt switch means being connected across the inputs of the output device and having an input capacitively coupled to the output terminals of the output device.
Claim 12
Dependent Claim
48 words
A solid state relay as in claim 4, further comprising second shunt switch means for selectably discharging the output device, the second shunt switch means being connected across the inputs of the output device and having an .input capacitively coupled to the output terminals of the output device.
Claim 13
Dependent Claim
33 words
A solid state relay as in claim 10, wherein the second shunt switch means is optically controlled by the light emitting diode and is disabled by light emitted by the light emitting diode.
Claim 14
Dependent Claim
33 words
A solid state relay as in claim 12, wherein the second shunt switch means is optically controlled by the light emitting diode and is disabled by light emitted by the light emitting diode.
Claim 15
Dependent Claim
120 words
A solid state relay comprising: a light emitting diode connectable to a control circuit; a primary photodiode array, optically coupled to the light emitting diode across a gap, for receiving light from the light emitting diode and for generating a voltage; an output device having inputs for receiving the voltage and output terminals connectable to a switched circuit, the output device providing a low impedance path between the output terminals in an on-state and a high impedance path in an off-state; and second shunt switch means for selectably discharging the output device, the second shunt switch means being connected across the inputs of the output device and having an input capacitively coupled to the output terminals of the output device.
Claim 16
Dependent Claim
120 words
A solid state relay comprising: a light emitting diode connectable to a control circuit; a primary photodiode array, optically coupled to the light emitting diode across a gap, for receiving light from the light emitting diode and for generating a voltage; an output device having inputs for receiving the voltage and output terminals connectable to a switched circuit, the output device providing a low impedance path between the output terminals in an on-state and a high impedance path in an off-state; and second shunt switch means for selectably discharging the output device, the second shunt switch means being connected across the inputs of the output device and having an input capacitively coupled to the output terminals of the output device.
Claim 17
Dependent Claim
17 words
A solid state relay as in claim 14, wherein the second shunt switch means comprises a transistor.
Claim 18
Dependent Claim
33 words
A solid state relay as in claim 15, wherein the second shunt switch means is optically controlled by the light emitting diode and is disabled by light emitted by the light emitting diode.
References Cited (Backward Citations)
US4390790A
Cited
US4564770A
Cited
GB2154820A
Cited
US4777387A
Cited
JPS6215924A
Cited
JPS6225511A
Cited
US4754175A
Cited
US4804866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |