GB1233961A - - Google Patents
Info
- Publication number
- GB1233961A GB1233961A GB1233961DA GB1233961A GB 1233961 A GB1233961 A GB 1233961A GB 1233961D A GB1233961D A GB 1233961DA GB 1233961 A GB1233961 A GB 1233961A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- transformer
- voltage
- current
- switched
- 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
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
Abstract
1,233,961. Transistor switching circuits. STANDARD TELEPHONES & CABLES Ltd. 8 Jan., 1969, No. 1122/69. Heading H3T. A first transistor is switched on via a second transistor followed by a transformer and is switched off, in response to the rise of current in the first transistor, via a third transistor and a transformer. When transistor T2 is switched on by a signal at its base a voltage is applied through transformer TR1, TR2 to transistor Tl to saturate it. Current builds up through inductor L until the resulting voltage across a resistor r causes T3 to conduct and switch Tl off. If (as in Fig. 1, not shown) T4 is omitted the current pulse in T1 is thus terminated. However, in Fig. 3, the input pulse is also applied via transformer TR5 to T4 which is connected to such a voltage that when TR1 goes off the same load current is maintained through T4 until the signal terminates. Diode D2 prevents excessive rise of collector voltage of T1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB112269 | 1969-01-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1233961A true GB1233961A (en) | 1971-06-03 |
Family
ID=9716542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1233961D Expired GB1233961A (en) | 1969-01-08 | 1969-01-08 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1233961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665309A1 (en) * | 1990-07-25 | 1992-01-31 | Mitsubishi Electric Corp | SEMICONDUCTOR CONTROL APPARATUS. |
-
1969
- 1969-01-08 GB GB1233961D patent/GB1233961A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665309A1 (en) * | 1990-07-25 | 1992-01-31 | Mitsubishi Electric Corp | SEMICONDUCTOR CONTROL APPARATUS. |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |