CN106505528A - The flash that a kind of employing discrete component is realized drives current foldback circuit - Google Patents
The flash that a kind of employing discrete component is realized drives current foldback circuit Download PDFInfo
- Publication number
- CN106505528A CN106505528A CN201710006313.1A CN201710006313A CN106505528A CN 106505528 A CN106505528 A CN 106505528A CN 201710006313 A CN201710006313 A CN 201710006313A CN 106505528 A CN106505528 A CN 106505528A
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- CN
- China
- Prior art keywords
- flash
- circuit
- discrete component
- current foldback
- output
- 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.)
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Classifications
-
- 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
- H02H7/20—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 electronic equipment
- H02H7/205—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 electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses the flash that a kind of employing discrete component is realized drives current foldback circuit; the circuit that the flash drives adopts MOSFET power tubes; current foldback circuit includes the current detection circuit that connects with flash driving output current; the output level of the current detection circuit connects the input of voltage comparator U1, and the output end of U1 is closed by the MOSFET power tubes that switching tube connects control flash drive circuit and turned on.The voltage comparator is connected to single-chip microcomputer also by optocoupler, and the single-chip microcomputer is connected to switching tube by optocoupler, and then controls the MOSFET power tubes closing of flash drive circuit and turn on.The flash that employing discrete component provided by the present invention is realized drives current foldback circuit, and flash drives output current big, during output overcurrent, automatic protection fast response time, will not and vehicle spontaneous to product cause any damage, and cost is relatively low.
Description
Technical field
The present invention relates to flash drives protection, the flash that more particularly to a kind of employing discrete component is realized to drive overcurrent protection
Circuit.
Background technology
In engineering machinery vehicle application, a lot of clients need to use flash driving output function, this wiring to vehicle
The user that offers convenience only needs to be connected to flash drive output with electric loading one end, another terminates to the big of vehicle itself
Iron.But the scheme output current that flash drives in the market（Less than 3 amperes）And output voltage（Less than 40 volts）All compare
Not driving output overcurrent defencive function that is less, having, it is impossible to meet specific demand, and the overwhelming majority is using specialty collection
Into circuit realiration, cost does not have any advantage.
Content of the invention
The present invention seeks to：The flash driving current foldback circuit that a kind of employing discrete component is realized is provided.Output overcurrent
When, automatic protection fast response time, will not and vehicle spontaneous to product cause any damage, and cost is relatively low.
The technical scheme is that：
The flash that a kind of employing discrete component is realized drives current foldback circuit, the circuit that the flash drives to adopt MOSFET work(
Rate pipe Q2, current foldback circuit include the current detection circuit that connects with flash driving output current, the current detection circuit
Output level connect the input of voltage comparator U1, the output end of voltage comparator is by switching tube connection control flash drive
The MOSFET power tubes of dynamic circuit are closed and are turned on.
Preferably, the voltage comparator is connected to single-chip microcomputer also by optocoupler U23-A, and the single-chip microcomputer passes through light
Coupling device U23-A is connected to switching tube, and then controls the MOSFET power tubes Q2 closings of flash drive circuit and turn on.
Preferably, the high voltage end that the source electrode connection flash of described MOSFET power tube Q2 drives, drain electrode is by series connection
Resistance R12 output driving currents, grid as control end by resistance R4 connect gate drive power positive pole VCP+, resistance
R12 constitutes current detection circuit.
Preferably, the output level of the resistance R12 connects the inverting input of voltage comparator U1, the positive input of U1
End input reference voltage.
Preferably, the switching tube adopts the colelctor electrode of PNP triode Q3, Q3 to connect low level, and emitter stage connects the grid of Q2
Pole, base stage connect emitter stage by resistance R5 respectively, connect colelctor electrode by electric capacity C5, and the output end of voltage comparator U1 passes through
The base stage of diode D1 connecting triode Q3.
Preferably, the gate drive power is included by coupling inductance L3-A, commutation diode D2, resistance R6 and voltage-stabiliser tube
The series loop that D4 is constituted, produces the VCP+ voltages for being consistently higher than Q2 power MOSFET source voltages.
It is an advantage of the invention that：
The flash that employing discrete component provided by the present invention is realized drives current foldback circuit, flash to drive output current big,
Highest output current can reach 18 amperes, and operating voltage can reach 100 volts, during output overcurrent, automatic protection fast response time, no
Meeting and vehicle spontaneous to product causes any damage, and cost is relatively low.
Description of the drawings
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Fig. 1 is that the flash that employing discrete component provided by the present invention is realized drives current foldback circuit schematic diagram.
Specific embodiment
The present invention, on successful Application product, during normal work, drives the electricity that can reliably export up to 18 amperes
Stream, when generation excessively stream is driven, circuit can be automatically switched off driving output within 4 microseconds, realize product itself and to vehicle
Defencive function.
The flash that disclosed employing discrete component is realized drives the company of the schematic diagram circuit of current foldback circuit
Relation is connect, as shown in Figure 1.The circuit that the flash drives adopts MOSFET power tube Q2, current foldback circuit to include and flash
The source electrode of the current detection circuit of output current series connection, described MOSFET power tube Q2 is driven to connect the high voltage that flash drives
End, resistance R12 output driving current of the drain electrode by series connection, grid connect gate drive power as control end by resistance R4
Positive pole VCP+, resistance R12 constitute current detection circuit, for detect from J3-1 output driving current.The resistance R12's
Output level connects the inverting input of voltage comparator U1, the normal phase input end input reference voltage of U1.Voltage comparator
Output end is closed by the MOSFET power tubes that switching tube connects control flash drive circuit and is turned on.The switching tube is adopted
PNP triode Q3, the colelctor electrode of Q3 connect low level, and emitter stage connects the grid of Q2, and base stage is respectively by resistance R5 connection transmittings
Pole, connect colelctor electrode by electric capacity C5, the base stage of the output end of voltage comparator U1 by diode D1 connecting triode Q3.When
When electric current is excessive, the pressure drop of R12 becomes big, causes comparator U1 to be output as low level, and the low level leads triode Q3 by D1
Logical, so that MOSFET power tubes Q2 is closed, cut-out output.
In addition, the voltage comparator is connected to single-chip microcomputer also by optocoupler U23-A, the single-chip microcomputer passes through optocoupler
Device U23-A is connected to switching tube, and then controls the MOSFET power tubes Q2 closings of flash drive circuit and turn on.U1 outputs
Low level makes J1-1 also export low level by optocoupler U23-A, and the low level may be coupled to single-chip microcomputer, when single-chip microcomputer is detected
After the low level, the conducting of U23-B optocouplers is controlled by J2-1, so as to the output work of Q2 power MOSFET tubes is closed by single-chip microcomputer
Can, and notify client to overhaul.
The similar method for detecting excessively stream by examining leakage resistance R12 also can realize by difference amplifier method that electric current is examined
Survey, but rarely the input pin of this difference amplifier can bear 100 volts of voltage, even if having, price is also extremely expensive.
The protection circuit of the present invention has also cleverly used coupling inductance to produce Q2 power MOSFET gate drive voltages.Institute
The series loop that gate drive power includes being made up of is stated coupling inductance L3-A, commutation diode D2, resistance R6 and voltage-stabiliser tube D4,
After electricity on product, one is produced by coupling inductance L3-A, diode D2, resistance R6 and voltage-stabiliser tube D4 and be consistently higher than Q2 power
The VCP+ voltages of MOSFET source.A charge pump circuit is not designed specially, and circuit is simple and reliable, and cost is relatively low.
Above-described embodiment technology design only to illustrate the invention and feature, its object is to allow person skilled in the art
Will appreciate that present disclosure and implement according to this, can not be limited the scope of the invention with this.All main according to the present invention
The modification for wanting the Spirit Essence of technical scheme to be done, should all be included within the scope of the present invention.
Claims (6)
1. the flash that a kind of employing discrete component is realized drives current foldback circuit, it is characterised in that：The electricity that the flash drives
Road adopts MOSFET power tube Q2, current foldback circuit to include the current detection circuit that connects with flash driving output current, institute
The output level for stating current detection circuit connects the input of voltage comparator U1, and the output end of voltage comparator passes through switching tube
The MOSFET power tubes of connection control flash drive circuit are closed and are turned on.
2. the flash that employing discrete component according to claim 1 is realized drives current foldback circuit, it is characterised in that：Institute
Stating voltage comparator and single-chip microcomputer being connected to also by optocoupler U23-A, the single-chip microcomputer is connected to by optocoupler U23-A
Switching tube, and then control the MOSFET power tubes Q2 closings of flash drive circuit and turn on.
3. the flash that the employing discrete component described in claim 2 is realized drives current foldback circuit, it is characterised in that：Described
The high voltage end that the source electrode connection flash of MOSFET power tube Q2 drives, resistance R12 output driving current of the drain electrode by series connection,
Grid connects the positive pole VCP+ of gate drive power as control end by resistance R4, and resistance R12 constitutes current detection circuit.
4. the flash that the employing discrete component described in claim 3 is realized drives current foldback circuit, it is characterised in that：The electricity
The output level of resistance R12 connects the inverting input of voltage comparator U1, the normal phase input end input reference voltage of U1.
5. the flash that the employing discrete component described in claim 4 is realized drives current foldback circuit, it is characterised in that：Described open
Closing pipe adopts the colelctor electrode of PNP triode Q3, Q3 to connect low level, and emitter stage connects the grid of Q2, and base stage passes through resistance R5 respectively
Connect emitter stage, connect colelctor electrode by electric capacity C5, the output end of voltage comparator U1 passes through diode D1 connecting triode Q3
Base stage.
6. the flash that the employing discrete component described in claim 3 is realized drives current foldback circuit, it is characterised in that：The grid
Pole driving power supply includes the series loop being made up of coupling inductance L3-A, commutation diode D2, resistance R6 and voltage-stabiliser tube D4, produces
One VCP+ voltage for being consistently higher than Q2 power MOSFET source voltages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710006313.1A CN106505528B (en) | 2017-01-05 | 2017-01-05 | A kind of flash driving current foldback circuit realized using discrete component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710006313.1A CN106505528B (en) | 2017-01-05 | 2017-01-05 | A kind of flash driving current foldback circuit realized using discrete component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106505528A true CN106505528A (en) | 2017-03-15 |
| CN106505528B CN106505528B (en) | 2018-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710006313.1A Active CN106505528B (en) | 2017-01-05 | 2017-01-05 | A kind of flash driving current foldback circuit realized using discrete component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106505528B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270922A (en) * | 2018-10-30 | 2019-01-25 | 河南天海电器有限公司 | The automotive electronics formula power distribution unit of self diagnosis and self-contr ol |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202447A (en) * | 2011-04-22 | 2011-09-28 | 威海东兴电子有限公司 | Heat-resistant and lightning proof LED driving power supply without electrolytic capacitor |
| CN202219735U (en) * | 2011-09-20 | 2012-05-16 | 河南天海科技有限公司 | High-edge driving circuit with secondary turn-off protection capability |
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
| CN104078919A (en) * | 2013-03-27 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and electronic breaker thereof |
| CN206379717U (en) * | 2017-01-05 | 2017-08-04 | 科蒂斯技术（苏州）有限公司 | The flash driving current foldback circuit that a kind of use discrete component is realized |
-
2017
- 2017-01-05 CN CN201710006313.1A patent/CN106505528B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202447A (en) * | 2011-04-22 | 2011-09-28 | 威海东兴电子有限公司 | Heat-resistant and lightning proof LED driving power supply without electrolytic capacitor |
| CN202219735U (en) * | 2011-09-20 | 2012-05-16 | 河南天海科技有限公司 | High-edge driving circuit with secondary turn-off protection capability |
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
| CN104078919A (en) * | 2013-03-27 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and electronic breaker thereof |
| CN206379717U (en) * | 2017-01-05 | 2017-08-04 | 科蒂斯技术（苏州）有限公司 | The flash driving current foldback circuit that a kind of use discrete component is realized |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270922A (en) * | 2018-10-30 | 2019-01-25 | 河南天海电器有限公司 | The automotive electronics formula power distribution unit of self diagnosis and self-contr ol |
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| Publication number | Publication date |
|---|---|
| CN106505528B (en) | 2018-11-30 |
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