CN208079034U - One kind having short-circuit protection function modified driving circuit structure - Google Patents
One kind having short-circuit protection function modified driving circuit structure Download PDFInfo
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- CN208079034U CN208079034U CN201820668701.6U CN201820668701U CN208079034U CN 208079034 U CN208079034 U CN 208079034U CN 201820668701 U CN201820668701 U CN 201820668701U CN 208079034 U CN208079034 U CN 208079034U
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Abstract
The utility model discloses one kind having short-circuit protection function modified driving circuit structure, including：Switch element S1, capacitance C1, resistance R1-R6, transistor Q1-Q3, contactor DZ1, diode VD1-VD3；It realizes and quickly starts and adjustment protection thresholding is required according to protection, to realize overload, the short-circuit protection function of various loads.
Description
Technical field
The utility model is related to auto electronics DC driven fields, and in particular, to there is one kind short circuit to protect
Protective function modified driving circuit structure.
Background technology
Patent《The simple driving circuit of function is protected and restored with load short circuits》(CN201510086633.3), the electricity
In practice, some fields cannot directly apply on road, to can not achieve the basic demand of circuit drives, be primarily present
Defect：1. anti-long term overloading energy force difference, when output end is not for dead short state, circuit protection function failure；
2. when accessing high-power bulb load, which may not be able to be activated；3. protective capability is non-adjustable, cannot be wanted according to load
Ask the adjustment for carrying out protective capability；4. it is slow to start response speed.
Utility model content
The utility model, which provides one kind, having short-circuit protection function modified driving circuit structure, overcomes above-mentioned lack
It falls into, realizes and quickly start and adjustment protection thresholding is required according to protection, to realize overload, the short-circuit protection work(of various loads
Energy.
To realize above-mentioned purpose of utility model, this application provides one kind having short-circuit protection function modified driving circuit
Structure, the modified driving circuit structure include：
Switch element S1, capacitance C1, resistance R1-R6, transistor Q1-Q3, contactor DZ1, diode VD1-VD3；Wherein,
The emitter of transistor Q1 is connect with power input, and the base stage of transistor Q1 is connect with one end of resistance R5, transistor Q1 collection
Electrode is connected in one end of resistance R6, the other end and one end of resistance R1, the hair of the anode of capacitance C1, transistor Q3 of resistance R5
Emitter-base bandgap grading is all connected with, the other end of resistance R1, the cathode of capacitance C1, transistor Q3 collector with switch element S1 anode even
It connects, the base stage of transistor Q3 is connect with one end of resistance R2, and the other end of resistance R2 is connect with the collector of transistor Q2, crystal
The emitter of pipe Q2, the cathode of switch element S1 are connect with the anode of diode VD3, and the base stage of transistor Q2 is with resistance R3's
One end connects, and the other end of resistance R3 is connect with after contactor DZ1 series connection with the cathode of diode VD1, and diode VD1 is just
Pole, the other end of resistance R6, resistance R4 one end connect with circuit output end, the other end of resistance R4 is with diode VD2's
Anode connection, the cathode of diode VD2, the cathode of diode VD3 are grounded.
Wherein, C1, R1, R5 form start-up circuit.Q3, R2, Q2, R3 composition control circuit.R5, Q1, R6 composition driving electricity
Road.DZ1, VD1 composition detect and return current feed circuit.R4 and VD2 forms false load circuit.
Startup and control circuit, including：Start-up circuit and control circuit, start-up circuit is for providing driving circuit output just
Begin to start driving；Control circuit is kept and shutdown for driving to open；Driving circuit continues certain power output for providing；
Load circuit is for realizing the circuit or device specifically acted；False load circuit is used for absorption circuit parasitic energy；Protection door
Limit and feedback circuit, including：Thresholding initialization circuit and feedback circuit, protection threshold circuit is protected to start voltage threshold for improving
Promote driving to open when enabling signal has reached certain voltage value with protection thresholding through feedback circuit control control circuit and protect
It holds；When output voltage is as low as threshold voltage, circuit protection function starts, and realizes output protection.
Switching signal input control start-up circuit starts driving output, then by protection thresholding and feedback circuit by output state
It just returns and is fed to control circuit, realize the opening of control circuit, to make driving circuit open completely；When switch element disconnects
When, so that control circuit circuit loop is disconnected, to which driving circuit driving circuit disconnects, realizes switch closing function；In driving electricity
When road drives, after short circuit or overload occur for external load circuit, driving output declines, and is filled perhaps when voltage drops to protection thresholding
Conducting voltage below when, control circuit stop driving, make driving circuit stop output, realize short-circuit protection function.
One or more technical solution provided by the present application, has at least the following technical effects or advantages：
Circuit in the application considers comprehensive, can carry out parameter adjustment according to practical driving power, reproducing circuit function,
Directly apply；Circuit in the application has overload protection ability, overcomes the strategy of the necessary shorted to earth protection of output end；This
Circuit in application can be applied to various types load；Circuit protection threshold voltage in the application is adjustable, realizes different mistakes
Carry protection demand；Circuit in the application uses two-step evolution circuit, fast implements switch and starts；Circuit in the application can have
Effect solves switch without output protecting function, avoids the accident as caused by load circuit short circuit, is used to improve electric system
Safety.
Description of the drawings
Attached drawing described herein is used for providing further understanding the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment；
Fig. 1 is circuit structure block diagram in the application；
Fig. 2 is circuit theory schematic diagram in the application.
Specific implementation mode
The utility model, which provides one kind, having short-circuit protection function modified driving circuit structure, overcomes the prior art
Defect, realize quickly start and according to protection require adjustment protection thresholding, to realize overload, the short-circuit protection of various loads
Function.
In order to be more clearly understood that the above objects, features, and advantages of the utility model, below in conjunction with the accompanying drawings and have
The utility model is further described in detail in body embodiment.It should be noted that in the case where not conflicting mutually,
Feature in embodiments herein and embodiment can be combined with each other.
Many details are elaborated in the following description in order to fully understand the utility model, still, this practicality
It is novel to be implemented different from the other modes being described herein in range using other, therefore, the protection of the utility model
Range is not limited by following public specific embodiment.
- Fig. 2 is please referred to Fig.1, this application provides one kind having short-circuit protection function modified driving circuit structure, below
Function module in circuit is illustrated：
Switching signal input is control (excitation) signal of driving circuit switch, which can be general switching value,
It can also be continuous impulse signal；
Start and is made of two parts circuit with the control circuit circuit：Start-up circuit and control circuit.Start-up circuit is main
For providing driving circuit output initial start driving；Control circuit is mainly used for driving and opens holding and shutdown；
Driving circuit, which mainly provides, continues certain power output；
Load circuit energy expenditure mainly realizes the circuit or device specifically acted；
False load is mainly used for absorption circuit parasitic energy；
Protection thresholding and the feedback circuit circuit are made of two parts circuit：Protect thresholding initialization circuit and feedback circuit.
The protection main function of threshold circuit is to start voltage threshold and protection thresholding for improving, when enabling signal has reached certain voltage
When value, promotes driving to open through feedback circuit control control circuit and keep；When output voltage is as low as threshold voltage, circuit protection
Function starts, and realizes output protection；
Power supply provides the energy of circuit work.
Operation principle is as follows：
When S1 is closed, by Q1 devices, (device can be that metal-oxide-semiconductor can also be transistor to VCC, say for convenience
Bright, illustrated by taking transistor as an example in the present specification), through R5, C1, S1, VD3, charge to C1, charging causes Q1
Certain base current is obtained, Q1 is made to be connected.In the above process, the size of charging and charging time are determined by R5, C1, and adjusting should
RC charging constants, can be with the startup time of adjustment circuit.After Q1 is connected, so that the collector terminal of Q1 is obtained high potential, work as current potential
When exceeding DZ1 voltages, Q2 is made to be connected, Q3 conductings, to further Q1 be made to be connected, driving Q1 saturations under the action of just returning feedback are led
It is logical, realize that switch is continuously turned on.
Since control circuit has used two-stage transistor circuit in this circuit, when the door that driving terminal voltage height is set to DZ1
When limit value, Q2 can amplify small feedback signal, so that control circuit Q3 is reached saturation state, to improve
The purpose for the speed that control circuit starts.
When S1 is disconnected, Q3 collector loops is made to disconnect, Q3 emitter no currents flow through, and Q1 is flowed through without base current, is made
Q1 ends, and realizes that switch disconnects.
When switching disconnection, capacitance C1 can cross R1 and the electric discharge of other circuits, other discharge loop resistance are much larger than R1, therefore
The electric discharge constant of start-up circuit depends primarily on R1, C1.After the completion of capacitance C1 is discharged by R1, then it is closed S1 switches next time
When, again serve to startup effect.
In the start-up circuit of capacitance C1 and R5 composition, charging current and conduction time constant influence the bringing onto load energy of the switch
Power.When R5 is bigger, charging current is smaller, and the ducting capacity of Q1 is weaker, and output voltage is smaller, when the resistance value is excessive, very
Startup cannot extremely be played the role of；The charge constant of C1, R5 are smaller, and the startup time is shorter, in bulb load, output end letter
Just terminate when number can't reach startup threshold, driving can be caused to fail.So in the circuit, the startup electricity of start-up circuit
Stream and time constant setting are most important, and starting current will determine that the length in charging time is wanted according to practical driving load
Slightly larger than the time span that drive signal rises to startup threshold value.
When output switching terminal shorted to earth or overload when, output switching terminal voltage drastically declines, drop to DZ1 voltages with
Under, Q2 cut-offs, Q3 loads are stopped, and since S1 is constantly in conducting state, C1 will be fully charged in a short time, and output end is made to postpone C1
It is turned off with the R5 charging time, Q1 will not be made to be connected again, to realize protective effect.R6 is large driven current density in the driving circuit
When, the current-limiting resistance of addition, generally Ω grades of resistance of m, main function are resisted when external loading generates short circuit as needed
Transcient short circuit time impact carries out current limliting partial pressure, and driving tube Q1 is avoided to damage；And in low current working condition, this resistance can take
Disappear, is divided using itself current limliting of driving tube Q1.It the detection and returns in current feed circuit, DZ1 is most important, mainly determines the guarantor of circuit
Shield starts to control thresholding, adjusts the voltage value of DZ1, can adjust output protection threshold voltage.
Since transistor or metal-oxide-semiconductor all deposit parasitic capacitance, when output switching terminal vacant state, output end has induced voltage.
When actually measuring, output end has certain current potential, thus be added R4 and VD2 compositions fictitious load can to this induced voltage into
Row absorbs, and keeps output pure.
VD1 is to prevent electric current from playing a reversed role in circuit, and VD2 is to prevent positive pole and power cathode reversed, is caused to circuit
It influences.
In circuit, relevant parameter is not yet explicitly given, circuit parameter can be adjusted according to demand, to make Circuit Matching
The protection exported to corresponding power.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the scope of the utility model.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (6)
1. one kind having short-circuit protection function modified driving circuit structure, which is characterized in that the structure includes：
Switch element S1, capacitance C1, resistance R1-R6, transistor Q1-Q3, contactor DZ1, diode VD1-VD3；Wherein, crystal
The emitter of pipe Q1 is connect with power input, and the base stage of transistor Q1 is connect with one end of resistance R5, transistor Q1 collectors
It is connected in one end of resistance R6, the other end and one end of resistance R1, the emitter of the anode of capacitance C1, transistor Q3 of resistance R5
Be all connected with, the other end of resistance R1, the cathode of capacitance C1, transistor Q3 collector with switch element S1 anode connect,
The base stage of transistor Q3 is connect with one end of resistance R2, and the other end of resistance R2 is connect with the collector of transistor Q2, transistor
The emitter of Q2, the cathode of switch element S1 are connect with the anode of diode VD3, the base stage of transistor Q2 and the one of resistance R3
The other end of end connection, resistance R3 is connect with after contactor DZ1 series connection with the cathode of diode VD1, the anode of diode VD1,
The other end of resistance R6, one end of resistance R4 are connect with circuit output end, the anode of the other end and diode VD2 of resistance R4
Connection, the cathode of diode VD2, the cathode of diode VD3 are grounded.
2. according to claim 1 have short-circuit protection function modified driving circuit structure, which is characterized in that C1, R1,
R5 forms start-up circuit.
3. according to claim 1 have short-circuit protection function modified driving circuit structure, which is characterized in that Q3, R2,
Q2, R3 composition control circuit.
4. according to claim 1 have short-circuit protection function modified driving circuit structure, which is characterized in that R5, Q1,
R6 forms driving circuit.
5. according to claim 1 have short-circuit protection function modified driving circuit structure, which is characterized in that DZ1,
VD1 compositions detect and return current feed circuit.
6. it is according to claim 1 have short-circuit protection function modified driving circuit structure, which is characterized in that R4 and
VD2 forms false load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820668701.6U CN208079034U (en) | 2018-05-07 | 2018-05-07 | One kind having short-circuit protection function modified driving circuit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820668701.6U CN208079034U (en) | 2018-05-07 | 2018-05-07 | One kind having short-circuit protection function modified driving circuit structure |
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| Publication Number | Publication Date |
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| CN208079034U true CN208079034U (en) | 2018-11-09 |
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| CN201820668701.6U Active CN208079034U (en) | 2018-05-07 | 2018-05-07 | One kind having short-circuit protection function modified driving circuit structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418572A (en) * | 2018-05-07 | 2018-08-17 | 雅安小航电器有限责任公司 | One kind having short-circuit protection function modified driving circuit |
-
2018
- 2018-05-07 CN CN201820668701.6U patent/CN208079034U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418572A (en) * | 2018-05-07 | 2018-08-17 | 雅安小航电器有限责任公司 | One kind having short-circuit protection function modified driving circuit |
| CN108418572B (en) * | 2018-05-07 | 2023-11-07 | 雅安小航电器股份有限公司 | Improved driving circuit with short-circuit protection function |
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Address after: 625000 Caoba industrial concentration area, Yucheng District, Ya'an City, Sichuan Province Patentee after: Ya'an Xiaohang Electric Appliances Co.,Ltd. Address before: 625000 Caoba industrial concentration area, Yucheng District, Ya'an City, Sichuan Province Patentee before: YA'AN XIAOHANG ELECTRONIC Co.,Ltd. |