GB1120560A - Improvements in electrical time delay apparatus - Google Patents
Improvements in electrical time delay apparatusInfo
- Publication number
- GB1120560A GB1120560A GB1606967A GB1606967A GB1120560A GB 1120560 A GB1120560 A GB 1120560A GB 1606967 A GB1606967 A GB 1606967A GB 1606967 A GB1606967 A GB 1606967A GB 1120560 A GB1120560 A GB 1120560A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- diode
- discharge path
- supply
- threshold voltage
- 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
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/292—Modifications for introducing a time delay before switching in thyristor, unijunction transistor or programmable unijunction transistor switches
Abstract
1,120,560. Transistor switching circuits. ARROW ELECTRIC SWITCHES Ltd. 7 April, 1967 [3 May, 1966], No. 16069/67. Heading H3T. A time delay circuit in which a capacitor 25 is chargeable to a threshold voltage through an adjustable resistor 34, 35 from a D.C. supply 20, 21, switched at 19, which voltage when attained by capacitor 25 is utilized for a triggering operation, includes an auxiliary discharge path for capacitor 25, including a diode 36 and a bias supply 37, 38 to reverse bias the diode and hence block the discharge path, the bias supply being inoperative when D.C. supply 20, 21 is interrupted at 19, thus unblocking the discharge path to allow the capacitor to discharge. When capacitor 25 reaches the threshold voltage at an adjustable time after the closure of switch 19, unijunction transistor 42 breaks down, causing SCR 28 to conduct and energize relay 32, the relay remaining energized until switch 19 is opened. Should switch 19 be opened before the threshold voltage is attained, the bias supply is removed from diode 36, thus completing the auxiliary discharge path to discharge capacitor 25. Zener diode 37 may be replaced by a resistor connected to the junction of Zener 47 and resistor 33 (Fig. 2, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US54737566A | 1966-05-03 | 1966-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1120560A true GB1120560A (en) | 1968-07-17 |
Family
ID=24184406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1606967A Expired GB1120560A (en) | 1966-05-03 | 1967-04-07 | Improvements in electrical time delay apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1120560A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490771A (en) * | 1981-12-09 | 1984-12-25 | Black & Decker Inc. | Control circuit arrangement for an electromagnetically operated power tool |
-
1967
- 1967-04-07 GB GB1606967A patent/GB1120560A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490771A (en) * | 1981-12-09 | 1984-12-25 | Black & Decker Inc. | Control circuit arrangement for an electromagnetically operated power tool |
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