GB1173416A - Solid State Relay Circuit - Google Patents
Solid State Relay CircuitInfo
- Publication number
- GB1173416A GB1173416A GB3520868A GB3520868A GB1173416A GB 1173416 A GB1173416 A GB 1173416A GB 3520868 A GB3520868 A GB 3520868A GB 3520868 A GB3520868 A GB 3520868A GB 1173416 A GB1173416 A GB 1173416A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- triac
- terminal
- thyristor scr
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
Landscapes
- Electronic Switches (AREA)
Abstract
1,173,416. Control systems for consuming apparatus. SQUARE D CO. 24 July, 1968 [6 Sept., 1967], No. 35208/68. Heading H2H. A solid state switching circuit is arranged such that the application of an A.C. to the circuit causes operation of the circuit to either close or to open the switching circuit together with control circuit means to inhibit the operation of the switching circuit. A switching circuit for a load 14 comprises a TRIAC 13 which is rendered conductive by the application of a signal to its gate g. If a terminal T1 is positive with respect to a terminal T2, current flows from T1 to T2 by way of a diode bridge 15, resistor 3RES, the gate-cathode path of a thyristor SCR, the diode bridge 15 and the gate g to terminal T2 path of the TRIAC 13. The thyristor SCR is thus rendered conductive, which in turn renders the TRIAC 13 conductive, causing current to flow in the load 14. When the terminal T2 is positive to terminal T1, current flows in a similar path causing the thyristor SCR to become conductive once more and hence the TRIAC 13 with the consequent flow of current in the load 14. When it is desired to render the TRIAC 13 inoperative, a switch SW in a control circuit is closed, thereby energizing the primary winding of a transformer T from an A.C. source 28, 29. A capacitor 4C is thereby charged from the secondary winding of the transformer T by way of a diode bridge 25. The capacitor 4C is connected to the gatecathode circuit of the thyristor SCR such that the charge thereon inhibits firing of the thyristor and hence of the TRIAC 13. Voltage rate of change protection for the TRIAC 13 is provided by resistor IRES and capacitor 1C and surge protection by an element D1 which may be a Zener diode. The circuit arrangement shown in Fig. 1 provides a solid state relay circuit having a normally closed contact function, the modified circuit of Fig. 2 (not shown) provides a similar circuit, but which has a normally open contact function. The circuits are provided with components to provide noise suppression.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66585367A | 1967-09-06 | 1967-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1173416A true GB1173416A (en) | 1969-12-10 |
Family
ID=24671817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3520868A Expired GB1173416A (en) | 1967-09-06 | 1968-07-24 | Solid State Relay Circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1173416A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2330704A (en) * | 1997-10-21 | 1999-04-28 | Timeguard Limited | Semiconductor AC switch units |
-
1968
- 1968-07-24 GB GB3520868A patent/GB1173416A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2330704A (en) * | 1997-10-21 | 1999-04-28 | Timeguard Limited | Semiconductor AC switch units |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |