CN206775770U - A kind of improvement circuit based on multichannel darlington transistor array - Google Patents
A kind of improvement circuit based on multichannel darlington transistor array Download PDFInfo
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- CN206775770U CN206775770U CN201720106134.0U CN201720106134U CN206775770U CN 206775770 U CN206775770 U CN 206775770U CN 201720106134 U CN201720106134 U CN 201720106134U CN 206775770 U CN206775770 U CN 206775770U
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- transistor array
- darlington transistor
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- wheel diode
- inductive load
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Abstract
A kind of improvement circuit based on multichannel darlington transistor array, comprising darlington transistor array, control unit, DC power supply, inductive load, it is characterized in that：In a kind of improvement circuit based on multichannel darlington transistor array, fly-wheel diode common port connects an earthed switch respectively inside Darlington transistor array（K1）With public fly-wheel diode（D1）, public fly-wheel diode（D1）Negative pole connects the DC power supply of inductive load, earthed switch（K1）Closure, darlington transistor array drive entirely, earthed switch（K1）Disconnect, each fly-wheel diode and public fly-wheel diode inside darlington transistor array（D1）Form the continuous current circuit of inductive load.
Description
Technical field
A kind of improvement circuit based on multichannel darlington transistor array is the utility model is related to, especially independently of control
Signal is capable of the improvement circuit of the low level darlington transistor array of key output.
Background technology
At present, known all kinds of multichannel darlington transistor array circuits, its type of drive are per road Darlington transistor
Driving is required for corresponding to drive signal all the way, the if desired full driving simultaneously of this kind of circuit, all must just drive and receive simultaneously
Respective drive signal.It can be seen that this kind of circuit does not have the function of designing and drive entirely simultaneously.
The content of the invention
In order to overcome dependence of the existing while full driving function to drive signal, the utility model provides one kind and is based on multichannel
The improvement circuit of darlington transistor array, it can not only retain original multichannel darlington transistor array and receive drive signal
The function being operated alone, the function of also increasing newly while drive entirely.
The concrete scheme that the utility model solves its technical problem is：It is single by Islington transistor array, control to improve circuit
Member, DC power supply, inductive load composition, the inductive load are connected with DC power supply, the Darlington transistor array
Each signal input part is connected with control unit signal output part, and each signal output part is connected with inductive load, described to reach woods
The pipe array inside fly-wheel diode common port that pauses connects an earthed switch respectively（K1）With public fly-wheel diode（D1）, it is public
Fly-wheel diode（D1）Negative pole connects the DC power supply of inductive load, earthed switch（K1）Closure, darlington transistor array
Full driving, the driving priority is high, can effectively meet for example：The key standard-sized sheet requirement of fireman's switch etc., earthed switch（K1）
Disconnect, each fly-wheel diode and public fly-wheel diode inside darlington transistor array（D1）Form the afterflow of inductive load
Loop, it can effectively suppress the reverse current of inductive load, prevent that Darlington transistor is breakdown.
Brief description of the drawings
Fig. 1 is application circuit of the present utility model.The application circuit is by taking fireman's switch as an example
Fig. 2 is the internal circuit diagram of Darlington transistor.
In Fig. 1, IC1 is 8 road darlington transistor array ULN2803, and K2 is relay, and LED1 is light emitting diode, D1
For fly-wheel diode, R1 is resistance, and K1 is fireman's switch, and VCC is DC power supply.
In Fig. 2, pin10 is ULN2803 No. 10 pins.
Embodiment
The present embodiment is mainly used in a key standard-sized sheet requirement of fireman's switch.
In Fig. 1, when system normal use, No. 10 pin K1 disconnect, and ULN2803 (IC1) output low levels, make LED1
Lamp is bright, and relay coil electric current is grounded through Darlington transistor, contact K2 adhesives.ULN2803 (IC1) outputs low level changes high level
When, relay K2 coil can produce reverse induction voltage, and the electric current is by the internal fly-wheel diodes of ULN2803 (IC1) from 10
The outflow of number pin, because fireman's switch K1 disconnects, the voltage can make public fly-wheel diode（D1）Conducting, continuous current circuit is formed,
Signal output terminal voltage can be controlled prevents the excessive breakdown ULN2803 (IC1) of voltage in VCC+1.4V or so.
When fireman's switch is opened, the pin of ULN2803 (IC1) 10 ground connection, priority is high, the uncontrollable output of single-chip microcomputer,
ULN2803 (IC1) 11-18 pins all export low level, and all LEDs are bright, relay whole adhesive.Export as high level
Pin electric current earth terminal is flowed to by the K1 on No. 10 pins, export and flowed to for low level pin by internal Darlington transistor
Earth terminal.It disclosure satisfy that the safety requirements of fireman's switch.
After fireman's switch is closed, original pin for exporting high level exports high level, relay again（K1）It can produce
Reverse induction voltage, because fireman's switch is again off, it can not be flowed out by being grounded, the voltage can make public fly-wheel diode
（D1）Conducting, is flowed back at VCC power supplys, forms continuous current circuit, you can voltage control at pin is prevented into voltage is excessive in VCC or so
Puncture ULN2803 (IC1).
Claims (1)
1. a kind of improvement circuit based on multichannel darlington transistor array, comprising darlington transistor array, control unit, supply
Direct current electric source, inductive load, each signal input part of Darlington transistor array are connected with control unit signal output part, often
Individual signal output part is connected with inductive load, and the inductive load is connected with DC power supply, it is characterized in that：The Darlington
Fly-wheel diode common port connects an earthed switch respectively inside pipe array（K1）With public fly-wheel diode（D1）, it is public continuous
Flow diode（D1）Negative pole connects the DC power supply of inductive load, earthed switch（K1）Closure, darlington transistor array are complete
Driving, earthed switch（K1）Disconnect, each fly-wheel diode and public fly-wheel diode inside darlington transistor array（D1）
Form the continuous current circuit of inductive load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720106134.0U CN206775770U (en) | 2017-01-24 | 2017-01-24 | A kind of improvement circuit based on multichannel darlington transistor array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720106134.0U CN206775770U (en) | 2017-01-24 | 2017-01-24 | A kind of improvement circuit based on multichannel darlington transistor array |
Publications (1)
| Publication Number | Publication Date |
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| CN206775770U true CN206775770U (en) | 2017-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720106134.0U Active CN206775770U (en) | 2017-01-24 | 2017-01-24 | A kind of improvement circuit based on multichannel darlington transistor array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765474A (en) * | 2019-01-25 | 2019-05-17 | 无锡固电半导体股份有限公司 | A kind of test method of Darlington transistor parameter |
-
2017
- 2017-01-24 CN CN201720106134.0U patent/CN206775770U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765474A (en) * | 2019-01-25 | 2019-05-17 | 无锡固电半导体股份有限公司 | A kind of test method of Darlington transistor parameter |
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