CN208143541U - It is a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device - Google Patents
It is a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device Download PDFInfo
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- CN208143541U CN208143541U CN201820628448.1U CN201820628448U CN208143541U CN 208143541 U CN208143541 U CN 208143541U CN 201820628448 U CN201820628448 U CN 201820628448U CN 208143541 U CN208143541 U CN 208143541U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device; wherein; the constant pressure light adjusting circuit with overcurrent protection and feedback function includes the light-adjusting module for controlling the duty ratio of output loading according to dim signal, further includes overcurrent protection module and overcurrent feedback module；The overcurrent protection module is connect with the light-adjusting module, for closing the light-adjusting module when the electric current for flowing through light-adjusting module is greater than predetermined current；The overcurrent feedback module is connect with the overcurrent protection module and failure input terminal, and the overcurrent protection module, which is also used to control the overcurrent feedback module when the electric current for flowing through light-adjusting module is greater than predetermined current, exports feedback signal to failure input terminal.By increasing overcurrent protection and fault feedback circuit, enables and turn off light-adjusting module in time when overcurrent condition occurs for constant pressure light adjusting circuit and export indicating fault, avoid the damage of product, and effectively increase the stability and safety of product work.
Description
Technical field
The utility model relates to constant pressure light regulating technology field, in particular to a kind of perseverance with overcurrent protection and feedback function
Press light adjusting circuit, dimming device.
Background technique
The dimming mode of mains lighting supply is generally divided into constant-current dimming and constant pressure light modulation, in some applications, constant pressure light modulation
There is oneself distinctive advantage, LED light source load can be used in parallel in power allowed band, and wiring is simple, mark easy to form
Quasi- modularity light source module facilitates production and user to use.
General constant pressure light adjusting circuit is as shown in Figure 1, PWM dim signal PWM_IN passes through resistance R1, R2 and field-effect tube
V1 controls the duty ratio of output loading, so as to adjust the illumination of LED load.In the work of this circuit, if LED light source
Load short circuits work under this failure for a long time then field-effect tube V1 can bear biggish electric current, the temperature meeting of field-effect tube V1
It increases rapidly, product is caused comparatively fast to damage.
Thus the prior art could be improved and improve.
Utility model content
In view of above-mentioned deficiencies of the prior art place, the purpose of this utility model is to provide one kind have overcurrent protection and
The constant pressure light adjusting circuit of feedback function, dimming device, by increasing overcurrent protection and fault feedback circuit, so that being dimmed in constant pressure
Circuit occurs to turn off in time light-adjusting module when overcurrent condition and export indicating fault, avoids the damage of product, and effectively mention
The high stability and safety of product work.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of constant pressure light adjusting circuit with overcurrent protection and feedback function, including exported for being controlled according to dim signal
The light-adjusting module of the duty ratio of load further includes overcurrent protection module and overcurrent feedback module；The overcurrent protection module and institute
Light-adjusting module connection is stated, for closing the light-adjusting module when the electric current for flowing through light-adjusting module is greater than predetermined current；The mistake
Stream feedback module is connect with the overcurrent protection module and failure input terminal, and the overcurrent protection module, which is also used to work as, flows through light modulation
The electric current of module controls the overcurrent feedback module and exports feedback signal to failure input terminal when being greater than predetermined current.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, the overcurrent protection module includes first
Control unit and the second control unit, the first control unit connect with the light-adjusting module and the second control unit, are used for
The second control unit is controlled when detecting that the electric current for flowing through light-adjusting module is greater than predetermined current to open；Second control unit
It is connect with the light-adjusting module and overcurrent feedback module, for closing the light-adjusting module and controlling the overcurrent feedback module
Feedback signal is exported to failure input terminal.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, the light-adjusting module includes the first electricity
Resistance, second resistance, 3rd resistor, first diode, capacitor and metal-oxide-semiconductor；One end of the first resistor connects PWM_IN signal
End, the other end of the first resistor connect the grid and overcurrent protection module of one end of second resistance, metal-oxide-semiconductor；The metal-oxide-semiconductor
Source electrode connection 3rd resistor one end and overcurrent protection module, the metal-oxide-semiconductor drain electrode connection first diode anode, electricity
One end of appearance and the cathode of load；The other end of the second resistance and the other end ground connection of 3rd resistor；One or two pole
The cathode of pipe connects the anode of the other end of capacitor, VBUS feeder ear and load.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, the first control unit includes the 4th
Resistance, the 5th resistance and the first triode；4th resistance one end connection metal-oxide-semiconductor source electrode, the 4th resistance it is another
One end connects the base stage and the second control unit of one end of the 5th resistance, the first triode；The collector of first triode
Second control unit is connected, the emitter of first triode and the other end of the 5th resistance are grounded.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, second control unit includes the 6th
Resistance, the 7th resistance, the second triode and the second diode；The base stage of second triode connects first triode
One end of collector and the 7th resistance, the collector of second triode connect the base stage of first triode, and described
The emitter of two triodes connects the cathode and overcurrent feedback module of one end of the 6th resistance, the second diode；Described
The other end of the other end of six resistance and the 7th resistance is all connected with VCC1 feeder ear；Described in the anode connection of second diode
The grid of metal-oxide-semiconductor.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, the overcurrent feedback module includes the 8th
Resistance, the 9th resistance and optocoupler；One end of 8th resistance connects the emitter of second triode, the 8th resistance
The other end connection optocoupler the 1st end；3rd end of the optocoupler connects one end and the failure input terminal of the 9th resistance；The light
2nd end of coupling and the 4th end are grounded.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, first triode is NPN type three
Pole pipe.
In the constant pressure light adjusting circuit with overcurrent protection and feedback function, second triode is positive-negative-positive three
Pole pipe.
A kind of dimming device, including shell are provided with pcb board in the shell, are provided on the pcb board as described above
The constant pressure light adjusting circuit with overcurrent protection and feedback function.
Compared to the prior art, the constant pressure light adjusting circuit provided by the utility model with overcurrent protection and feedback function,
In dimming device, the constant pressure light adjusting circuit with overcurrent protection and feedback function includes defeated for being controlled according to dim signal
The light-adjusting module of the duty ratio loaded out further includes overcurrent protection module and overcurrent feedback module；The overcurrent protection module with
The light-adjusting module connection, for closing the light-adjusting module when the electric current for flowing through light-adjusting module is greater than predetermined current；It is described
Overcurrent feedback module is connect with the overcurrent protection module and failure input terminal, and the overcurrent protection module, which is also used to work as, flows through tune
The electric current of optical module controls the overcurrent feedback module and exports feedback signal to failure input terminal when being greater than predetermined current.Pass through increasing
Add overcurrent protection and fault feedback circuit, enables and turn off light-adjusting module in time simultaneously when overcurrent condition occurs for constant pressure light adjusting circuit
Indicating fault is exported, the damage of product is avoided, and effectively increases the stability and safety of product work.
Detailed description of the invention
Fig. 1 is the circuit diagram of constant pressure light adjusting circuit in the prior art.
Fig. 2 is the circuit diagram of the constant pressure light adjusting circuit provided by the utility model with overcurrent protection and feedback function.
Specific embodiment
Field-effect tube temperature increases when overcurrent occurs in view of constant pressure light adjusting circuit in the prior art, the disadvantages of being easily damaged,
The purpose of this utility model is to provide a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device, leads to
Increase overcurrent protection and fault feedback circuit are crossed, enables and turns off light modulation mould in time when overcurrent condition occurs for constant pressure light adjusting circuit
Block simultaneously exports indicating fault, avoids the damage of product, and effectively increases the stability and safety of product work.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
Referring to Fig. 2, the constant pressure light adjusting circuit provided by the utility model with overcurrent protection and feedback function includes adjusting
Optical module 10, overcurrent protection module 20 and overcurrent feedback module 30, the light-adjusting module 10 and dim signal input terminal, that is, PWM_
The connection of the end IN, the overcurrent protection module 20 are connect with the light-adjusting module 10, the overcurrent feedback module 30 and the overcurrent
Protective module 20 is connected with failure input terminal, that is, end ERR, wherein the light-adjusting module 10 is used to be controlled according to dim signal and export
The duty ratio of load, and then the illumination of LED load is adjusted, the overcurrent protection module 20 is used for when the electricity for flowing through light-adjusting module 10
Stream closes the light-adjusting module 10 when being greater than predetermined current, and when the electric current for flowing through light-adjusting module 10 is greater than predetermined current time control
It makes the overcurrent feedback module 30 and exports feedback signal to failure input terminal.Constant pressure light adjusting circuit provided by the utility model passes through
Increase overcurrent protection module 20 and overcurrent feedback module 30, enable in constant pressure light adjusting circuit there is a situation where when electric current is excessive and
When turn off the light-adjusting module 10, and export fault feedback signal, effectively prevent as electric current it is excessive caused by security risk
And damage of product.
Further, the overcurrent protection module 20 includes first control unit（It is unlabeled in figure）With the second control unit
（It is unlabeled in figure）, the first control unit connect with the light-adjusting module 10 and the second control unit, second control
Unit is also connect with the light-adjusting module 10 and overcurrent feedback module 30, wherein the first control unit is for detecting
The unlatching of the second control unit is controlled when flowing through the electric current of light-adjusting module 10 greater than predetermined current, second control unit is used for
The light-adjusting module 10 is closed after unlatching and controls the overcurrent feedback module 30 exports feedback signal to failure input terminal, from
And realize the function of overcurrent protection and feedback, i.e., in the present embodiment, light-adjusting module is currently flowed through by first control unit detection
10 electric current controls the second control unit by first control unit and opens when the electric current is greater than predetermined current, the second control
Unit is then reduced by the driving voltage of control light-adjusting module 10 after opening, and then turns off the light-adjusting module 10, and synchronous
It controls the overcurrent feedback module 30 and exports feedback signal to the failure input terminal of processor, export indicating fault in time, protecting
Having protected can also inform that short circuit overcurrent failure has occurred in user at this time while product is not damaged in time, improve maintenance efficiency.
Specifically, the light-adjusting module 10 includes first resistor R1, second resistance R2,3rd resistor R3, first diode
D1, capacitor C1 and metal-oxide-semiconductor V1；One end of the first resistor R1 connects PWM_IN signal end, and the first resistor R1's is another
End connects the grid and overcurrent protection module 20 of one end of second resistance R2, metal-oxide-semiconductor V1；The source electrode connection the of the metal-oxide-semiconductor V1
One end of three resistance R3 and overcurrent protection module 20, anode, the capacitor C1 of the drain electrode connection first diode D1 of the metal-oxide-semiconductor V1
One end and load cathode（It is the end LED- in the present embodiment）；The other end of the second resistance R2 and 3rd resistor R3's is another
One end ground connection；The cathode of the first diode D1 connects the anode of the other end of capacitor C1, VBUS feeder ear and load（This reality
It applies in example as the end LED+）.In the present embodiment, PWM dim signal PWM_IN passes through first resistor R1, second resistance R2 and metal-oxide-semiconductor
V1 controls the duty ratio of output loading, and so as to adjust the illumination of LED load, wherein 3rd resistor R3 is negative as LED light source
The current-limiting resistance of load, mainly plays metering function, the continued flow resistance that first diode D1 is loaded as LED light source, and capacitor C1 then makees
For the filter capacitor C1 of LED light source load, guarantee the stability for the voltage that output to LED light source loads.
Further, the first control unit includes the 4th resistance R4, the 5th resistance R5 and the first triode Q1；It is described
The source electrode of one end connection metal-oxide-semiconductor V1 of 4th resistance R4, one end of the 5th resistance R5 of other end connection of the 4th resistance R4,
The base stage and the second control unit of first triode Q1；The collector connection of the first triode Q1, second control is single
Member, the emitter of the first triode Q1 and the other end of the 5th resistance R5 are grounded.In the present embodiment, the one or three pole
Pipe Q1 is NPN type triode.
Second control unit includes the 6th resistance R6, the 7th resistance R7, the second triode Q2 and the second diode D2；
The base stage of the second triode Q2 connects the collector of the first triode Q1 and one end of the 7th resistance R7, and described second
The collector of triode Q2 connects the base stage of the first triode Q1, the emitter connection of the second triode Q2 described the
One end of six resistance R6, the second diode D2 cathode and overcurrent feedback module 30；The other end of the 6th resistance R6 and
The other end of seven resistance R7 is all connected with VCC1 feeder ear；The anode of the second diode D2 connects the grid of the metal-oxide-semiconductor V1.
In the present embodiment, the second triode Q2 is PNP type triode.
When it is implemented, in the constant pressure light adjusting circuit provided by the utility model with overcurrent protection and feedback function, when
When flowing through the electric current increase of metal-oxide-semiconductor V1 and 3rd resistor R3, the voltage on 3rd resistor R3 can synchronize increase, when electric current increases to
When predetermined current, the first triode Q1 is controlled by the 4th resistance R4 and the 5th resistance R5 at this time and is opened, later the first triode
Q1 controls the second triode Q2 by the 7th resistance R7 and opens, and the second triode Q2 passes through the 6th resistance R6 and the second diode D2
So that the driving voltage of metal-oxide-semiconductor V1 reduces, and then controls metal-oxide-semiconductor V1 and close, the electric current for flowing through metal-oxide-semiconductor V1 is effectively controlled, is realized
Overcurrent protection function.
Further, the overcurrent feedback module 30 includes the 8th resistance R8, the 9th resistance R9 and optocoupler OP1；Described
One end of eight resistance R8 connects the emitter of the second triode Q2, and the other end of the 8th resistance R8 connects optocoupler OP1
The 1st end；The 3rd end of the optocoupler OP1 connects one end and the failure input terminal of the 9th resistance R9；The 9th resistance R9's is another
One end connects VCC2 feeder ear, and the other end of the 9th resistance R9 connects VCC2 feeder ear, the 2nd end of the optocoupler OP1 and
4th end is grounded.
When it is implemented, the second triode Q2 is opened at this time, the emitter of the second triode Q2 when over current fault occurs
In low level, optocoupler OP1 is controlled by the 8th resistance R8 and is closed, exports high electricity under the pull-up effect of the 9th resistance R9 at this time
Flat fault feedback signal timely and effectively exports indicating fault, improves maintenance efficiency to ERR failure input terminal.
Based on the above-mentioned constant pressure light adjusting circuit with overcurrent protection and feedback function, the utility model correspondingly provides one kind
Dimming device, including shell are provided with pcb board in the shell, and being provided on the pcb board as described above there is overcurrent to protect
The constant pressure light adjusting circuit of shield and feedback function, due to dimming electricity to the constant pressure with overcurrent protection and feedback function above
Road is described in detail, and is not described further herein.
In conclusion the constant pressure light adjusting circuit provided by the utility model with overcurrent protection and feedback function, light modulation dress
In setting, the constant pressure light adjusting circuit with overcurrent protection and feedback function includes for controlling output loading according to dim signal
Duty ratio light-adjusting module, further include overcurrent protection module and overcurrent feedback module；The overcurrent protection module and the tune
Optical module connection, for closing the light-adjusting module when the electric current for flowing through light-adjusting module is greater than predetermined current；The overcurrent is anti-
Feedback module is connect with the overcurrent protection module and failure input terminal, and the overcurrent protection module, which is also used to work as, flows through light-adjusting module
Electric current control the overcurrent feedback module when being greater than predetermined current and export feedback signal to failure input terminal.By increasing overcurrent
Protection and fault feedback circuit enable and turn off light-adjusting module in time when overcurrent condition occurs for constant pressure light adjusting circuit and export event
Barrier instruction, avoids the damage of product, and effectively increases the stability and safety of product work.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (9)
1. a kind of constant pressure light adjusting circuit with overcurrent protection and feedback function, including for negative according to dim signal control output
The light-adjusting module of the duty ratio of load, which is characterized in that further include overcurrent protection module and overcurrent feedback module；The overcurrent protection
Module is connect with the light-adjusting module, for closing the light modulation mould when the electric current for flowing through light-adjusting module is greater than predetermined current
Block；The overcurrent feedback module is connect with the overcurrent protection module and failure input terminal, and the overcurrent protection module is also used to
The overcurrent feedback module is controlled when the electric current for flowing through light-adjusting module is greater than predetermined current exports feedback signal to failure input
End.
2. the constant pressure light adjusting circuit according to claim 1 with overcurrent protection and feedback function, which is characterized in that described
Overcurrent protection module includes first control unit and the second control unit, the first control unit and the light-adjusting module and the
The connection of two control units, is opened for controlling the second control unit when detecting that the electric current for flowing through light-adjusting module is greater than predetermined current
It opens；Second control unit is connect with the light-adjusting module and overcurrent feedback module, for close the light-adjusting module and
It controls the overcurrent feedback module and exports feedback signal to failure input terminal.
3. the constant pressure light adjusting circuit according to claim 2 with overcurrent protection and feedback function, which is characterized in that described
Light-adjusting module includes first resistor, second resistance, 3rd resistor, first diode, capacitor and metal-oxide-semiconductor；The first resistor
One end connects PWM_IN signal end, and the other end of the first resistor connects the grid and overcurrent of one end of second resistance, metal-oxide-semiconductor
Protective module；One end of the source electrode connection 3rd resistor of the metal-oxide-semiconductor and overcurrent protection module, the drain electrode connection of the metal-oxide-semiconductor
The anode of first diode, one end of capacitor and load cathode；The other end of the second resistance and 3rd resistor it is another
End ground connection；The cathode of the first diode connects the anode of the other end of capacitor, VBUS feeder ear and load.
4. the constant pressure light adjusting circuit according to claim 3 with overcurrent protection and feedback function, which is characterized in that described
First control unit includes the 4th resistance, the 5th resistance and the first triode；The source of one end connection metal-oxide-semiconductor of 4th resistance
Pole, the other end of the 4th resistance connect the base stage and the second control unit of one end of the 5th resistance, the first triode；It is described
The collector of first triode connects second control unit, the emitter of first triode and the 5th resistance it is another
End is grounded.
5. the constant pressure light adjusting circuit according to claim 4 with overcurrent protection and feedback function, which is characterized in that described
Second control unit includes the 6th resistance, the 7th resistance, the second triode and the second diode；The base stage of second triode
Connect the collector of first triode and one end of the 7th resistance, the collector connection described first of second triode
The base stage of triode, the emitter of second triode connect one end of the 6th resistance, the second diode cathode and
Overcurrent feedback module；The other end of 6th resistance and the other end of the 7th resistance are all connected with VCC1 feeder ear；Described second
The anode of diode connects the grid of the metal-oxide-semiconductor.
6. the constant pressure light adjusting circuit according to claim 5 with overcurrent protection and feedback function, which is characterized in that described
Overcurrent feedback module includes the 8th resistance, the 9th resistance and optocoupler；One end of 8th resistance connects second triode
Emitter, the 8th resistance the other end connection optocoupler the 1st end；3rd end of the optocoupler connects the one of the 9th resistance
End and failure input terminal；The other end of 9th resistance connects VCC2 feeder ear, and the 2nd end of the optocoupler and the 4th end connect
Ground.
7. the constant pressure light adjusting circuit according to claim 4 with overcurrent protection and feedback function, which is characterized in that described
First triode is NPN type triode.
8. the constant pressure light adjusting circuit according to claim 5 with overcurrent protection and feedback function, which is characterized in that described
Second triode is PNP type triode.
9. a kind of dimming device, including shell, pcb board is provided in the shell, which is characterized in that be arranged on the pcb board
Just like the constant pressure light adjusting circuit described in claim 1-8 any one with overcurrent protection and feedback function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820628448.1U CN208143541U (en) | 2018-04-28 | 2018-04-28 | It is a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820628448.1U CN208143541U (en) | 2018-04-28 | 2018-04-28 | It is a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device |
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| Publication Number | Publication Date |
|---|---|
| CN208143541U true CN208143541U (en) | 2018-11-23 |
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ID=64310603
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820628448.1U Active CN208143541U (en) | 2018-04-28 | 2018-04-28 | It is a kind of with overcurrent protection and the constant pressure light adjusting circuit of feedback function, dimming device |
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| Country | Link |
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| CN (1) | CN208143541U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116546687A (en) * | 2023-07-07 | 2023-08-04 | 广东东菱电源科技有限公司 | Multi-machine parallel three-in-one current regulation anti-interference circuit |
| CN117939738A (en) * | 2024-03-14 | 2024-04-26 | 珠海市圣昌电子有限公司 | Constant-voltage constant-current dimming circuit and dimming method thereof |
-
2018
- 2018-04-28 CN CN201820628448.1U patent/CN208143541U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116546687A (en) * | 2023-07-07 | 2023-08-04 | 广东东菱电源科技有限公司 | Multi-machine parallel three-in-one current regulation anti-interference circuit |
| CN116546687B (en) * | 2023-07-07 | 2023-09-19 | 广东东菱电源科技有限公司 | Multi-machine parallel three-in-one current regulation anti-interference circuit |
| CN117939738A (en) * | 2024-03-14 | 2024-04-26 | 珠海市圣昌电子有限公司 | Constant-voltage constant-current dimming circuit and dimming method thereof |
| CN117939738B (en) * | 2024-03-14 | 2024-06-11 | 珠海市圣昌电子有限公司 | Constant-voltage constant-current dimming circuit and dimming method thereof |
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