GB811091A - Improvements in or relating to bistable trigger circuits - Google Patents
Improvements in or relating to bistable trigger circuitsInfo
- Publication number
- GB811091A GB811091A GB18519/57A GB1851957A GB811091A GB 811091 A GB811091 A GB 811091A GB 18519/57 A GB18519/57 A GB 18519/57A GB 1851957 A GB1851957 A GB 1851957A GB 811091 A GB811091 A GB 811091A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- transistor
- capacitor
- supply
- cycles
- 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
- 239000003990 capacitor Substances 0.000 abstract 7
- 230000001419 dependent effect Effects 0.000 abstract 2
- 230000007423 decrease Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/313—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of semiconductor devices with two electrodes, one or two potential barriers, and exhibiting a negative resistance characteristic
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Electronic Switches (AREA)
Abstract
811,091. Semi-conductor circuits. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. June 12, 1957 [June 22, 1956],No. 18519/57. Class 40 (6). [Also in Group XXXVII] A circuit which becomes conductive when an A.C. supply voltage applied thereto exceeds a first value and becomes non-conductive when it falls below a second value includes a transistor having its emitter-collector path connected in series with a load across the supply and voltage responsive means which prevents base current flow when the applied voltage is below a predetermined value. In Fig. 1 an A.C. voltage is applied to terminals 14, 15 with the result that the capacitor 3 charges through the leakage resistance of the transistor 4 with the polarity shown. If the voltage of the supply is sufficient the capacitor voltage reaches a value at which a zenner diode 8 breaks down causing the transistor to become more conductive. On the positive half-cycles a capacitor 13 is charged while on the negative half-cycles the supply voltage and the voltage across capacitor 13 act in series and current flows through the transistor to further charge capacitor 3. This continues on successive negative half-cycles progressively charging capacitor 3 until its voltage reaches a limiting value exceeding that of the supply. The transistor is now highly conducting and sufficient current flows to operate a relay 10 or a power transistor connected in its place. If the A.C. supply voltage is decreased the charge across capacitor 3 progres. sively decreases on successive half-cycles until the transistor becomes non-conductive again. The voltage of the supply at which this occurs is less than that at which the transistor became conductive by an amount dependent upon the value of a resistor 9. The change-over from conducting to non-conducting states of the transistor takes an appreciable number of cycles dependent upon the magnitude of the voltage and accordingly the switching time has an approximate inverse time/voltage characteristic.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US811091XA | 1956-06-22 | 1956-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB811091A true GB811091A (en) | 1959-04-02 |
Family
ID=22162142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18519/57A Expired GB811091A (en) | 1956-06-22 | 1957-06-12 | Improvements in or relating to bistable trigger circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB811091A (en) |
-
1957
- 1957-06-12 GB GB18519/57A patent/GB811091A/en not_active Expired
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