JPS5666931A - Clamp circuit for direct current load drive circuit - Google Patents
Clamp circuit for direct current load drive circuitInfo
- Publication number
- JPS5666931A JPS5666931A JP14349279A JP14349279A JPS5666931A JP S5666931 A JPS5666931 A JP S5666931A JP 14349279 A JP14349279 A JP 14349279A JP 14349279 A JP14349279 A JP 14349279A JP S5666931 A JPS5666931 A JP S5666931A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- direct current
- circuit
- drive circuit
- current load
- 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.)
- Pending
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
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
- H03K17/08146—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in bipolar transistor switches
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Electronic Switches (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
PURPOSE:To ensure to protect the drive circuit, by flowing the backrash current to ground side with a transistor which turns on when the output level of the load side terminal of a drive transistor is at a failure level. CONSTITUTION:When the control input of a control input terminal 36 is from H to L level, transistors 24 and 26 are off, to interrupt the drive of a DC load 20. Thus, a counter electromotive force is produced on a load side terminal A and it is higher than the power supply voltage Vcc, then a transistor 42 is conductive and the backrash current flows to ground GND34 via a transistor 42.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14349279A JPS5666931A (en) | 1979-11-06 | 1979-11-06 | Clamp circuit for direct current load drive circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14349279A JPS5666931A (en) | 1979-11-06 | 1979-11-06 | Clamp circuit for direct current load drive circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5666931A true JPS5666931A (en) | 1981-06-05 |
Family
ID=15339961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14349279A Pending JPS5666931A (en) | 1979-11-06 | 1979-11-06 | Clamp circuit for direct current load drive circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5666931A (en) |
-
1979
- 1979-11-06 JP JP14349279A patent/JPS5666931A/en active Pending
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