IT1214250B - Transient current recirculating circuit for inductive load - Google Patents
Transient current recirculating circuit for inductive loadInfo
- Publication number
- IT1214250B IT1214250B IT8783639A IT8363987A IT1214250B IT 1214250 B IT1214250 B IT 1214250B IT 8783639 A IT8783639 A IT 8783639A IT 8363987 A IT8363987 A IT 8363987A IT 1214250 B IT1214250 B IT 1214250B
- Authority
- IT
- Italy
- Prior art keywords
- transistor
- switching transistor
- control transistor
- inductive load
- recirculating circuit
- Prior art date
Links
- 230000003134 recirculating effect Effects 0.000 title abstract 2
- 230000001939 inductive effect Effects 0.000 title 1
- 230000001052 transient effect Effects 0.000 title 1
Landscapes
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
- Electronic Switches (AREA)
Abstract
The recirculating circuit has the emitter of a control transistor (Tc) connected to the collector of the power switching transistor (Tpw). The collector of the control transistor and the base of the power switching transistor are commoned. In operation, interruption of the drive to the power switching transistor produces an overvoltage across the inductance (L) connected between the switching transistor collector and earth. An over-voltage of VBE turns on the control transistor which turns on the switching transistor. The control transistor withstands a minimum fraction (1/X) of the current which discharges the energy stored by the inductance, where X is the current gain of the control transistor.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8783639A IT1214250B (en) | 1987-06-30 | 1987-06-30 | Transient current recirculating circuit for inductive load |
EP88830137A EP0287525B1 (en) | 1987-04-14 | 1988-03-30 | Transitory current recirculation through a power switching transistor driving an inductive load |
DE8888830137T DE3871846T2 (en) | 1987-04-14 | 1988-03-30 | Inrush current feedback through an inductive load driving power switching transistor. |
US07/180,501 US4962346A (en) | 1987-04-14 | 1988-04-12 | Transitory current recirculation through a power switching transistor driving an inductive load |
JP63091215A JP2911453B2 (en) | 1987-04-14 | 1988-04-13 | Current recirculation circuit of power switching transistor driving inductive load |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8783639A IT1214250B (en) | 1987-06-30 | 1987-06-30 | Transient current recirculating circuit for inductive load |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8783639A0 IT8783639A0 (en) | 1987-06-30 |
IT1214250B true IT1214250B (en) | 1990-01-10 |
Family
ID=11323530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT8783639A IT1214250B (en) | 1987-04-14 | 1987-06-30 | Transient current recirculating circuit for inductive load |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1214250B (en) |
-
1987
- 1987-06-30 IT IT8783639A patent/IT1214250B/en active
Also Published As
Publication number | Publication date |
---|---|
IT8783639A0 (en) | 1987-06-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970628 |