GB959483A - Improvements in or relating to electric oscillator circuits - Google Patents
Improvements in or relating to electric oscillator circuitsInfo
- Publication number
- GB959483A GB959483A GB2689361A GB2689361A GB959483A GB 959483 A GB959483 A GB 959483A GB 2689361 A GB2689361 A GB 2689361A GB 2689361 A GB2689361 A GB 2689361A GB 959483 A GB959483 A GB 959483A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- transistor
- frequency
- resistance
- inverter
- 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
- 230000000903 blocking effect Effects 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
959,483. Pulse modulation circuits. GENERAL ELECTRIC CO. Ltd. July 25, 1962 [July 25, 1961], No. 26893/61. Heading H4L. [Also in Division H2] In a transistor blocking oscillator circuit in which the frequency of operation is determined by a resistance-capacity timing circuit, the resistance of the timing circuit is connected in parallel with the emitter-collector path of a transistor the effective resistance of which may be varied by the application if a control voltage to its base electrode whereby the frequency of oscillation may be varied. In the circuit shown the blocking oscillator 1 drives an inverter circuit comprising semi-conductor controlled rectifiers 4, 5 through the intermediary of a bi-stable trigger circuit 6 comprising two reciprocally - coupled transistors, the inverter output being supplied to energize an alternating-current motor 3. During starting, the heavy surge of current through transformer 11 produces an increased rectified negative voltage across capacitor 31 and so increases the negative bias on the transistor 36 which is connected in parallel with the resistor 23 of the timing circuit 23, 24, thus increasing the frequency of oscillation of the oscillator 1 whereby the inverter is better able to supply the initial heavy load current to the motor 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2689361A GB959483A (en) | 1961-07-25 | 1961-07-25 | Improvements in or relating to electric oscillator circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2689361A GB959483A (en) | 1961-07-25 | 1961-07-25 | Improvements in or relating to electric oscillator circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB959483A true GB959483A (en) | 1964-06-03 |
Family
ID=10250859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2689361A Expired GB959483A (en) | 1961-07-25 | 1961-07-25 | Improvements in or relating to electric oscillator circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB959483A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3365636A (en) * | 1964-12-17 | 1968-01-23 | Ametek Inc | Brushless electric motor circuit |
-
1961
- 1961-07-25 GB GB2689361A patent/GB959483A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3365636A (en) * | 1964-12-17 | 1968-01-23 | Ametek Inc | Brushless electric motor circuit |
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