GB902486A - A protective circuit arrangement for a transistor switch - Google Patents
A protective circuit arrangement for a transistor switchInfo
- Publication number
- GB902486A GB902486A GB13697/59A GB1369759A GB902486A GB 902486 A GB902486 A GB 902486A GB 13697/59 A GB13697/59 A GB 13697/59A GB 1369759 A GB1369759 A GB 1369759A GB 902486 A GB902486 A GB 902486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- transistor
- value
- motor
- circuit
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
-
- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
- Control Of Multiple Motors (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
902,486. Control of D.C. motors. LICENTIA PATENT - VERWALTUNGS - G.m.b.H. April 22, 1959 [April 25, 1958], No. 13697/59. Class 38 (3). [Also in Groups XXXV and XL (c)] A transistor motor-control circuit comprises means responsive to the transistor current when it exceeds the maximum permissible value to control the input control voltage so as to interrupt the transistor current. The Figure shows a motor 1 and inductor 2 connected in circuit with batteries 5, 6 of opposite polarity and transistors 3 and 4 which are rendered alternately conducting by signals applied to the base electrodes. By varying the on-off ratio of the transistors the mean value of the current applied to the motor can be varied. When the " on " period is relatively long the motor current would build up in accordance with the dotted curve 23 (Fig. 3), to a value above the maximum permissible level 24. To prevent this resistors 10 and 11 are connected in series with the transistors and the voltage across them is applied to bistable circuits 12, 13 which when the resistor voltage exceeds that corresponding to the maximum current, opens the base circuit of the associated transistor. The current then falls from the maximum as indicated by curve 14 until the circuits 12, 13 restores to the original condition so that the mean output current remains at a varying value just below the maximum permissible value. When the motor is being braked it may cause reverse current to flow to the power supply and where rectifiers are used this could damage the power supply system. Accordingly, a supply as shown in Fig. 5, could be used. When reverse current flows the smoothing condenser is charged to a greater value than normal and this value is sufficient when applied through resistor 21 to operate a switching circuit 22 which renders transistor 19 conductive to discharge the capacitor until the voltage is such that tne switching circuit 22 restores to its original condition and cuts transistor 19 off again. It is stated in the Specification that the push-pull circuit arrangement shown in Fig. 1 could be replaced by a transistor bridge circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL30299A DE1061420B (en) | 1958-04-25 | 1958-04-25 | Protective device for switching transistor arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB902486A true GB902486A (en) | 1962-08-01 |
Family
ID=7265181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13697/59A Expired GB902486A (en) | 1958-04-25 | 1959-04-22 | A protective circuit arrangement for a transistor switch |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH373441A (en) |
| DE (1) | DE1061420B (en) |
| GB (1) | GB902486A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3129374A (en) * | 1960-12-07 | 1964-04-14 | Westinghouse Electric Corp | Semiconductor protection circuit |
| DE1438675B1 (en) * | 1963-07-20 | 1970-05-27 | Bosch Gmbh Robert | Protection circuit for the main transistor of a voltage regulator |
| US3938008A (en) * | 1974-09-18 | 1976-02-10 | International Business Machines Corporation | Common bus driver complementary protect circuit |
-
1958
- 1958-04-25 DE DEL30299A patent/DE1061420B/en active Pending
-
1959
- 1959-04-22 CH CH7247559A patent/CH373441A/en unknown
- 1959-04-22 GB GB13697/59A patent/GB902486A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1061420B (en) | 1959-07-16 |
| CH373441A (en) | 1963-11-30 |
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