CN208352967U - Short-circuit protection circuit - Google Patents
Short-circuit protection circuit Download PDFInfo
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- CN208352967U CN208352967U CN201820995110.XU CN201820995110U CN208352967U CN 208352967 U CN208352967 U CN 208352967U CN 201820995110 U CN201820995110 U CN 201820995110U CN 208352967 U CN208352967 U CN 208352967U
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Abstract
The utility model discloses a kind of short-circuit protection circuits, including drive module, boost module and protective module；The drive module has signal input part and control signal output；The boost module has voltage input end, boosting output end and controlled end；The protective module has protection signal input part and protection signal output end；The control signal output of the drive module is connect with the controlled end of the boost module, and the signal input part of the drive module is for receiving pwm signal；The drive module is used to control the boost in voltage that the boost module will input boost module according to the pwm signal received；The boosting output end of the boost module is connect with the protection signal input part of the protective module；The load input terminal that the protection signal output end of the protective module is used to load with backlight is connect.The utility model realizes the growth of suppression circuit short circuit currents, solves the problems, such as that component is damaged because of the instantaneous large-current impact that short circuit generates in circuit.
Description
Technical field
The utility model belongs to Switching Power Supply application field, and in particular to a kind of short-circuit protection circuit.
Background technique
A kind of boost type LED constant current driver circuit for simulating dimming mode has booster circuit and LED light in the prior art
Item, booster circuit provide the voltage of corresponding driving LED light bar.When carrying out LED light bar short-circuit test to the route, in route
The input voltage that booster circuit is supplied to LED light bar is up to 100 more and lies prostrate, and drives electricity due to entirely boosting when LED light bar short circuit
Roadlock resist it is small so that in circuit generate tens amperes of high current of moment；High current by connect in circuit with LED light bar two
Pole pipe and resistance, and since the short-circuit protection function of the drive control chip in circuit is from detecting high current to executing short circuit
Protection has certain delay, and the instantaneous large-current that cannot effectively inhibit short circuit to generate is repeated a number of times when in the route
When LED light bar short-circuit test, lead to simulate the component in the boost type LED constant current driver circuit of dimming mode because short circuit generates
Instantaneous large-current impact and damage.
Utility model content
The purpose of this utility model is to provide a kind of short-circuit protection circuit, realizes the growth of suppression circuit short circuit currents,
Solve the problems, such as that component is damaged because of the instantaneous large-current impact that short circuit generates in circuit.
In order to solve the above technical problems, the utility model embodiment provides a kind of short-circuit protection circuit, comprising: driving mould
Block, boost module and protective module；Wherein,
The drive module has signal input part and control signal output；The boost module has voltage input
End, boosting output end and controlled end；The protective module has protection signal input part and protection signal output end；
The control signal output of the drive module is connect with the controlled end of the boost module, the drive module
Signal input part is for receiving pwm signal；The drive module is used to control the boosting according to the pwm signal received
Module will input the boost in voltage of boost module；The protection signal of the boosting output end and the protective module of the boost module
Input terminal connection；The load input terminal that the protection signal output end of the protective module is used to load with backlight is connect.
Further, the protective module includes the first inductance；
The first end of first inductance is connect with the protection signal input part of the protective module, first inductance
Second end is connect with the protection signal output end of the protective module.
Further, the drive module also has current detecting end and voltage detection terminal；The boost module also has
Tested end；Wherein,
The current detecting end is connect with the tested end, and the voltage detection terminal is used to detect the negative of the backlight load
Carry output end voltage.
Further, the boost module includes: first switch tube, first resistor, the second inductance, diode and capacitor；
Wherein,
The first end of the first resistor is connect with the controlled end of the boost module, the second end of the first resistor with
The control terminal of the first switch tube connects；The first end of second inductance and the voltage input end of the boost module connect
It connects, the second end of second inductance is connect with the anode of the diode；The cathode of the diode and the boost module
Boosting output end connection；The first end of the capacitor is connect with the cathode of the diode, the second end ground connection of the capacitor；
The input terminal of the first switch tube is connect with the second end of second inductance, the output end of the first switch tube with it is described
The tested end of boost module connects, and the output end ground connection of the first switch tube.
Further, the drive module includes boost control chip；The boost control chip has driving signal defeated
Enter end, driving signal output end, current feedback input terminal and Voltage Feedback input terminal；Wherein,
The driving signal input is connect with the signal input part of the drive module, the driving signal output end with
The control signal output of the drive module connects, the current detecting end of the current feedback input terminal and the drive module
Connection, the Voltage Feedback input terminal are connect with the voltage detection terminal of the drive module.
Further, the short-circuit protection circuit further includes backlight load；Wherein, the backlight load has load input
End and load outputs；
The load input terminal of the backlight load is connect with the protection signal output end of the protective module, and the backlight is negative
The load outputs of load are grounded.
Further, backlight load be include LED light bar made of N number of LED light series connection；N > 1.
Compared with the prior art, a kind of beneficial effect of short-circuit protection circuit of the utility model is: being protected by setting
The protection that module realizes circuit is protected, specifically, the drive module, the boost module and the protective module form constant current liter
Driving circuit is pressed, the backlight connecting with the protection signal output end of the protective module will be supplied to after boost in voltage and is loaded；When
When short circuit occurs for the backlight load, Short-Circuit High Current is generated in circuit loop, since the protection signal of the protective module is defeated
Enter end to connect with the boost module, when Short-Circuit High Current flows into the protective module by the protection signal input part,
The protective module, which is controlled, inhibits short in short-circuit loop with the increase in current in the short-circuit loop of backlight load composition, realization
The function of the generation of road instantaneous large-current, so that when backlight load is repeated a number of times short circuit, the boosting mould
The repeatability impact short circuit current that component in block is subjected to significantly reduces.By the way that the protective module is arranged in circuit,
Simple low cost solves the problems, such as that the component in circuit is damaged because of the instantaneous large-current impact that short circuit generates, circuit reliability
It improves.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of short-circuit protection circuit provided by the utility model；
Fig. 2 is the circuit diagram of second embodiment of short-circuit protection circuit provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
It is the structural schematic diagram of one embodiment of short-circuit protection circuit provided by the utility model, the short circuit referring to Fig. 1
Protecting circuit includes: drive module 10, boost module 20 and protective module 30；Wherein,
The drive module 10 has signal input part and control signal output；The boost module 20 has voltage defeated
Enter end, boosting output end and controlled end；The protective module 30 has protection signal input part and protection signal output end；
The control signal output of the drive module 10 is connect with the controlled end of the boost module 20, the driving mould
The signal input part of block 10 is for receiving pwm signal；The drive module 10 is used for according to the pwm signal control received
The boost module 20 will input the boost in voltage of boost module；The boosting output end of the boost module 20 and the protection mould
The protection signal input part of block 30 connects；The protection signal output end of the protective module 20 is used for the load with backlight load 40
Input terminal connection.
It should be noted that short-circuit protection circuit provided by the embodiment of the utility model, the signal of the drive module 10
The external pwm signal provided of input terminal input, in the drive module 10 after the isolation amplification by the drive module 10
Control signal output exports control signal to the controlled end of the boost module 20, and the boost module 20 is according to the control
After signal boosts to tens volts of voltages of the voltage input end for inputting the boost module 20, in the boost module 20
The output end that boosts exports the voltage of more than 100 volts.The back being connect due to the protection signal output end with the protective module 30
Light load 40 provides certain impedance in normal work for circuit, so that the electric current in circuit is direct current constant value, at this point, with
The protective module 30 of the boosting output end connection of the boost module 20 is equivalent to the resistance of a small impedance in circuit,
Constant current boost driving circuit is had no effect on to supply the voltage of backlight load 40.When short circuit occurs for backlight load 40
When, Short-Circuit High Current is generated in circuit loop, so that the electric current in circuit increases suddenly；Due to the protection of the protective module 30
Signal input part is connect with the boost module 20, when Short-Circuit High Current flows into the protection by the protection signal input part
When module 30, the protective module 30 is controlled and the increase in current in the short-circuit loop of 40 composition of backlight load, realization suppression
The function of the generation of transcient short circuit time high current in short-circuit loop processed.When backlight load 40 is repeated a number of times short circuit, institute
It states the repeatability impact short circuit current that the component in boost module 20 is subjected to significantly to reduce, greatly improves the reliable of circuit
Property.
As shown in Fig. 2, being the circuit diagram of second embodiment of short-circuit protection circuit provided by the utility model.This
The short-circuit protection circuit that embodiment provides on the basis of the above embodiments, has advanced optimized the structure of partial function circuit,
It is specific as follows:
Further, the protective module 30 includes the first inductance L1；
The first end of the first inductance L1 is connect with the protection signal input part of the protective module 30, first electricity
The second end of sense L1 is connect with the protection signal output end of the protective module 30.
Further, the drive module 10 also has current detecting end and voltage detection terminal；The boost module 20 is also
With tested end；Wherein,
The current detecting end is connect with the tested end, and the voltage detection terminal is used to detect the backlight load 40
Load outputs voltage.
Further, the boost module 20 includes: first switch tube Q1, first resistor R1, the second inductance L2, diode
D101 and capacitor C1；Wherein,
The first end of the first resistor R1 is connect with the controlled end of the boost module 20, and the of the first resistor R1
Two ends are connect with the control terminal of the first switch tube Q1；The first end of the second inductance L2 and the electricity of the boost module 20
Input terminal connection is pressed, the second end of the second inductance L2 is connect with the anode of the diode D101；The diode D101
Cathode connect with the boosting output end of the boost module 20；The first end of the capacitor C1 is negative with the diode D101's
Pole connection, the second end ground connection of the capacitor C1；The second of the input terminal of the first switch tube Q1 and the second inductance L2
End connection, the output end of the first switch tube Q1 is connect with the tested end of the boost module 20, and the first switch
The output end of pipe Q1 is grounded.
It should be noted that short-circuit protection circuit provided by the embodiment of the utility model, the boost module 20 further include
Second resistance R2 and 3rd resistor R3；The first end of the second resistance R2 is connect with the control terminal of the first switch tube Q1,
The second end of the second resistance R2 is connect with the output end of the first switch tube Q1；The 3rd resistor R3 is set to described the
Between one switching tube Q1 and ground terminal.The first resistor R1 described in the boost module 20 is driving resistance, third electricity
Resistance R3 is sample detecting resistance；Since the second end of the first resistor R1 is connect with the control terminal of the first switch tube Q1,
When the control signal output of the drive module 10 is supplied to the controlled end high level signal of the boost module 20, so that
When the voltage being added in the first resistor increases the on state threshold voltage for reaching the first switch tube Q1 of the boost module 20,
So that the first switch tube Q1 conducting；When the control signal output of the drive module 10 is supplied to the boost module 20
Controlled end low level signal when so that the voltage being added on the first resistor R1 first opening lower than the boost module 20
When closing the on state threshold voltage of pipe Q1, so that the first switch tube Q1 is turned off.Due to the 3rd resistor R3 first end with
The output end of the first switch tube Q1 connects, and when first switch tube Q1 conducting, flows through the first switch tube Q1's
Electric current flows through the 3rd resistor R3 and generates voltage drop on the 3rd resistor R3, and generated on 3rd resistor R3
Voltage drop is proportional to the electric current for flowing through the first switch tube Q1, can be by detecting the voltage drop on the 3rd resistor R3
Judgement flows through the size of the electric current of the first switch tube Q1.
Further, the drive module 10 includes boost control chip U1；The boost control chip U1 has driving
Signal input part, driving signal output end GATE, current feedback input terminal CS and Voltage Feedback input terminal LED_FB；Wherein,
The driving signal input is connect with the signal input part of the drive module 10, the driving signal output end
GATE is connect with the control signal output of the drive module 10, the current feedback input terminal CS and the drive module 10
The connection of current detecting end, the Voltage Feedback input terminal LED_FB connect with the voltage detection terminal of the drive module 10.
It should be noted that short-circuit protection circuit provided by the embodiment of the utility model, the pwm signal control that outside provides
Boost control chip U1 in the drive module 10, so that by drive module 10, boost module 20, protective module 30 and backlight
The circuit of the boost type backlight constant current driving of 40 composition simulation light modulation of load.First inductance L1 is storage in the boost module 30
Energy inductance, first capacitor C1 are energy storage filter capacitor；Boost control chip U1 in the drive module 10 receives pwm signal
And output driving information is to the first switch tube Q1 in the boost module 20.The voltage input end of the boost module 20 inputs
More than ten volts of voltage, when boost control chip U1 controls first switch tube Q1 conducting, inductance L2 to the electric energy of input into
Row energy storage is discharged from the energy storage filter capacitor C1 in circuit and is supplied to the backlight load 40 connecting with the protective module 30
Electricity, diode D101, which is set to, prevents electric current backflow between inductance L2 and capacitor C1；When boost control chip U1 controls the third
When switching tube Q3 is turned off, inductance L2 releases energy to backlight load supplying, while energy storage filter capacitor C1 carries out charging process, from
And it realizes the drive module 10 and the boost module 20 is controlled according to the pwm signal received and will input boost module 20
Boost in voltage, output meets the high voltage of driving backlight load after the boost module 20 boosts.And the boost module
30 are additionally provided with the 3rd resistor R3 to first switch tube Q1 detection sampling, the electric current of the boost control chip U1 in drive module 10
Voltage drop on feedback input end detection 3rd resistor R3 adopts the electric current for flowing through the first switch tube Q1 to realize
Sample monitoring, when the boost control chip U1 detects that the electric current for flowing through first switch tube Q1 is super by current feedback input terminal CS
Threshold value out, then the boost control chip U1 starts overcurrent protection, prevent first switch tube Q1 in the boost module 20 because
Overcurrent and be damaged.It is equipped between the load outputs and ground terminal connection of the backlight load 40 to the backlight load detecting
The Voltage Feedback input terminal detection of 4th resistance R4 of sampling, the boost control chip U1 in drive module 10 and the backlight are negative
The voltage drop on the 4th resistance R4 of 40 load outputs connection is carried to realize to the electric current for flowing through the backlight load 40
Sampling monitoring is carried out, flows through the backlight when the boost control chip U1 is detected by Voltage Feedback input terminal LED_FB
The electric current of load 40 exceeds threshold value, then the boost control chip U1 starts overcurrent protection, and entire circuit enters to beat to be protected every formula
Mode, circuit can be constantly restarted.
Further, the short-circuit protection circuit further includes backlight load 40；Wherein, the backlight load 40 has load
Input terminal and load outputs；
The load input terminal of the backlight load 40 is connect with the protection signal output end of the protective module 30, the back
The load outputs ground connection of light load 40.
Further, it includes LED light bar made of N number of LED light series connection that the backlight, which loads 40 to be,；N > 1.
It should be noted that short-circuit protection circuit provided by the embodiment of the utility model, the drive module, the boosting
Module and the protective module form constant current boost driving circuit, and the circuit provides sufficiently large voltage driving and the protection
The backlight load 40 of the protection signal output end connection of module 30.After the backlight loads 40 short circuit, due to the liter
Component impedance in die block 20 is small, and the voltage being added on the load input terminal of the backlight load 40 is up to more than 100
Volt, so that the transcient short circuit time high current that will generate tens amperes in circuit flows through the boost module 20 and the protective module
30, when flowing into the electric current increased suddenly from the protection signal input part of the protective module 30, due to the protective module 30
In the first inductance L1 the physical characteristic that cannot be mutated of inductive current, the protective module 30 is controlled and backlight load 40
Increase in current in the short-circuit loop of composition；Also, the induced voltage equation on inductance are as follows: in short-circuit loop short circuit currents
For wherein R is the total impedance in short circuit current, it is known that in the very short time in the backlight 40 short circuit of load, short circuit current
It is that exponentially characteristic increases, the in the protective module 30 being set between the boost module 20 and backlight load 40
The the inductance of one inductance L1 the big, and the increase in current in short-circuit loop is made to become slower, to realize the protective module 30
Control and the increase in current in the short-circuit loop of 40 composition of backlight load.Meanwhile U1 pairs of the boost control chip in circuit
The boost module 20 have overcurrent protection function, but boost control chip U1 from detect Short-Circuit High Current to execute short circuit protect
Protector has certain delay, and the overcurrent protection function of the boost control chip U1 can only can just be opened after transcient short circuit time high current
Begin, can not effectively inhibit the high current of transcient short circuit time.Realize that inhibiting short-circuit returns by the way that the protective module 30 is arranged in circuit
The function of the generation of transcient short circuit time high current in road, and make when the backlight loads 40 and is repeated a number of times short circuit, it is described
The repeatability impact short circuit current that component in boost module 20 is subjected to significantly reduces, and component is because of short circuit in solution circuit
The problem of instantaneous large-current of generation is impacted and is damaged.And the protective module 30 is not limited in including first inductance
L1 can also be the protective module 30 with high inductance coefficent that multiple inductance elements compose in parallel.
In conclusion the beneficial effect of short-circuit protection circuit provided by the embodiment of the utility model is: being protected by setting
The protection that module realizes circuit is protected, specifically, the drive module, the boost module and the protective module form constant current liter
Driving circuit is pressed, the backlight connecting with the protection signal output end of the protective module will be supplied to after boost in voltage and is loaded；When
When short circuit occurs for the backlight load, Short-Circuit High Current is generated in circuit loop, since the protection signal of the protective module is defeated
Enter end to connect with the boost module, when Short-Circuit High Current flows into the protective module by the protection signal input part,
The protective module, which is controlled, inhibits short in short-circuit loop with the increase in current in the short-circuit loop of backlight load composition, realization
The function of the generation of road instantaneous large-current, and make when the backlight loads and is repeated a number of times short circuit, the boosting mould
The repeatability impact short circuit current that component in block is subjected to significantly reduces.By the way that the protective module is arranged in circuit,
Simple low cost solves the problems, such as that the component in circuit is damaged because of the instantaneous large-current impact that short circuit generates, circuit reliability
It improves.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (7)
1. a kind of short-circuit protection circuit characterized by comprising drive module, boost module and protective module；Wherein,
The drive module has signal input part and control signal output；The boost module has voltage input end, rises
Press output end and controlled end；The protective module has protection signal input part and protection signal output end；
The control signal output of the drive module is connect with the controlled end of the boost module, the signal of the drive module
Input terminal is for receiving pwm signal；The drive module is used to control the boost module according to the pwm signal received
The boost in voltage of boost module will be inputted；The boosting output end of the boost module and the protection signal of the protective module input
End connection；The load input terminal that the protection signal output end of the protective module is used to load with backlight is connect.
2. short-circuit protection circuit as described in claim 1, which is characterized in that the protective module includes the first inductance；
The first end of first inductance is connect with the protection signal input part of the protective module, and the second of first inductance
End is connect with the protection signal output end of the protective module.
3. short-circuit protection circuit as described in claim 1, which is characterized in that the drive module also have current detecting end and
Voltage detection terminal；The boost module also has tested end；Wherein,
The current detecting end is connect with the tested end, and the load that the voltage detection terminal is used to detect the backlight load is defeated
Outlet voltage.
4. short-circuit protection circuit as claimed in claim 3, which is characterized in that the boost module includes: first switch tube,
One resistance, the second inductance, diode and capacitor；Wherein,
The first end of the first resistor is connect with the controlled end of the boost module, the second end of the first resistor with it is described
The control terminal of first switch tube connects；The first end of second inductance is connect with the voltage input end of the boost module, institute
The second end for stating the second inductance is connect with the anode of the diode；The boosting of the cathode of the diode and the boost module
Output end connection；The first end of the capacitor is connect with the cathode of the diode, the second end ground connection of the capacitor；Described
The input terminal of one switching tube is connect with the second end of second inductance, the output end of the first switch tube and the boosting mould
The tested end of block connects, and the output end ground connection of the first switch tube.
5. short-circuit protection circuit as claimed in claim 3, which is characterized in that the drive module includes boost control chip；
The boost control chip has driving signal input, driving signal output end, current feedback input terminal and Voltage Feedback defeated
Enter end；Wherein,
The driving signal input is connect with the signal input part of the drive module, the driving signal output end with it is described
The control signal output of drive module connects, and the current detecting end of the current feedback input terminal and the drive module connects
It connects, the Voltage Feedback input terminal is connect with the voltage detection terminal of the drive module.
6. short-circuit protection circuit as described in claim 1, which is characterized in that the short-circuit protection circuit further includes that backlight is negative
It carries；Wherein, the backlight load has load input terminal and load outputs；
The load input terminal of the backlight load is connect with the protection signal output end of the protective module, the backlight load
Load outputs ground connection.
7. short-circuit protection circuit as claimed in claim 5, which is characterized in that backlight load be include N number of LED light series connection
Made of LED light bar；N > 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820995110.XU CN208352967U (en) | 2018-06-26 | 2018-06-26 | Short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820995110.XU CN208352967U (en) | 2018-06-26 | 2018-06-26 | Short-circuit protection circuit |
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| Publication Number | Publication Date |
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| CN208352967U true CN208352967U (en) | 2019-01-08 |
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ID=64881983
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| CN201820995110.XU Active CN208352967U (en) | 2018-06-26 | 2018-06-26 | Short-circuit protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611292A (en) * | 2019-10-26 | 2019-12-24 | 广州睿圣电子科技有限公司 | PFC circuit and protection circuit thereof |
-
2018
- 2018-06-26 CN CN201820995110.XU patent/CN208352967U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611292A (en) * | 2019-10-26 | 2019-12-24 | 广州睿圣电子科技有限公司 | PFC circuit and protection circuit thereof |
| CN110611292B (en) * | 2019-10-26 | 2024-03-12 | 广州睿圣电子科技有限公司 | PFC circuit and protection circuit thereof |
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