CN109287025A - It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage - Google Patents
It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage Download PDFInfo
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- CN109287025A CN109287025A CN201810453762.5A CN201810453762A CN109287025A CN 109287025 A CN109287025 A CN 109287025A CN 201810453762 A CN201810453762 A CN 201810453762A CN 109287025 A CN109287025 A CN 109287025A
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- 238000007667 floating Methods 0.000 title claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 36
- 230000009466 transformation Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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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- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
It can inhibit the excessively high LED drive circuit of floating voltage the present invention relates to a kind of; including voltage transformation module, LED drive control module and voltage comparison module; voltage transformation module includes transformer; LED drive control module includes LED drive chip; the first end and second end of the armature winding of transformer is separately connected the input voltage of protection circuit and the switching tube drain electrode inside LED drive chip; the input terminal of the first secondary windings connection voltage comparison module of transformer, the energization input of the output end connection LED drive chip of voltage comparison module.The actual value and theoretical value of LED lamp output no-load voltage are compared judgement by the voltage comparison module being connected with the energization input of LED drive chip being arranged by the present invention, so that it is determined that the turn-on and turn-off of LED drive chip, realization inhibits the phenomenon that LED lamp output no-load overtension, so that LED lamp output no-load voltage always works among safe range value.
Description
Technical field
The present invention relates to power technique fields, it is specifically related to a kind of can inhibit the excessively high LED drive circuit of floating voltage.
Background technique
LED drive power greatly uses the flyback of two windings to work topological at present, and the LED that this mode works drives
Dynamic power supply output no-load voltage is extremely easy to be influenced by transformer sensibility reciprocal or transformer leakage inductance, because of transformer sensibility reciprocal or leakage inductance
Increase, output no-load voltage also and then increases, and can make to export electrolytic capacitor generation roof fall phenomenon in this way, to make LED driving electricity
Source failure.
On the one hand from the point of view of design of transformer angle, transformer is usually in design parameter, since lamps and lanterns volumetric spaces have
Limit, the transformer of design should not be too large, it is meant that the inductance of Design of Transformer is bigger while the coil number that needs also compares
It is more, then transformer leakage inductance is caused to will increase；On the other hand from the point of view of transformer batch production, transformer is manual coiling after all
, it will not guarantee that each winding coiling of transformer is smooth, the coupling between every layer line circle can be caused to be deteriorated in this way, to make
The leakage inductance of transformer increases.
Summary of the invention
The present invention is to overcome the shortcomings of to provide a kind of excessively high LED of floating voltage that can inhibit described in the above-mentioned prior art to drive
Dynamic circuit.
In order to solve the above technical problems, technical scheme is as follows:
It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage, including voltage transformation module, LED drive control module and electricity
Comparison module is pressed, the voltage transformation module includes transformer, and the LED drive control module includes LED drive chip, described
The first end and second end of the armature winding of transformer is separately connected inside input voltage and the LED drive chip of protection circuit
Switching tube drain electrode, the first secondary windings of the transformer connect the input terminal of the voltage comparison module, and the voltage compares
The energization input of the output end connection LED drive chip of module.
Further, as optimal technical scheme, the voltage comparison module include voltage commutation module, division module and
The first end of controllable accurate source of stable pressure, the first secondary windings of the input terminal and transformer of the voltage commutation module connects
It connects, the output end of the voltage commutation module is connect by division module with the reference end of the controllable accurate source of stable pressure, described
Second end, the anode of controllable accurate source of stable pressure and the ground terminal of LED drive chip of first secondary windings connect power ground altogether；Institute
State the energization input of the cathode connection LED drive chip of controllable accurate source of stable pressure.
Further, as optimal technical scheme, the voltage comparison module further includes first capacitor, the first capacitor
The output end of the voltage commutation module is connected in parallel in the division module.
Further, as optimal technical scheme, voltage commutation module includes the first diode and first being connected in series
Resistance, the first end of anode the first secondary windings of connection of the first diode.
Further, as optimal technical scheme, the second resistance and 3rd resistor of the series connection, second electricity
Resistance and first resistor are connected in series；Described first capacitor one end connects the node between the first resistor and second resistance, separately
One end and the 3rd resistor are connected to power ground altogether；The reference end connection second resistance and third electricity of the controllable accurate source of stable pressure
Node between resistance.
Further, as optimal technical scheme, the LED drive control module further includes the 5th resistance, and the LED drives
Dynamic chip interior and the current monitoring input terminal of switching tube drain electrode conducting connect power ground by the 5th resistance.
Further, as optimal technical scheme, the LED drive control module further include successively with the protection circuit
Input voltage the 6th resistance and the second capacitor that are connected in series, the node between the 6th resistance and the second capacitor connects LED
The energization input of driving chip, the second capacitor after series connection connect power ground.
Further, as optimal technical scheme, the voltage transformation module further includes RCD absorbing circuit and RC circuit,
The RCD absorbing circuit is arranged between the armature winding of the transformer and the input voltage of the protection circuit, the change
The first end of the armature winding of depressor connects the output end of the RCD absorbing circuit, and the second of the armature winding of the transformer
End connects the input terminal of the RCD absorbing circuit；The first end of the second subprime winding of the transformer passes through RC circuit connection
The anode output of the protection circuit, the second end of the second subprime winding of the transformer connect the negative terminal of the protection circuit
Output.
Further, as optimal technical scheme, the voltage transformation module further includes third capacitor, the third capacitor
Anode connection RC circuit output end and it is described protection circuit anode output between node, the cathode of the third capacitor
With being connected to negative terminal output and the second source of the protection circuit altogether with the second end of the second subprime winding of the transformer.
It further, further include rectification module as optimal technical scheme, the output end of the rectification module and the electricity
The input terminal of pressure conversion module is connected, the input voltage of the rectification module output protection circuit.
Compared with prior art, the beneficial effect of technical solution of the present invention is: the present invention is controlled by driving with LED for setting
The voltage comparison module that the energization input of the LED drive chip of molding block is connected is by the reality of LED lamp output no-load voltage
Actual value and theoretical value are compared judgement, so that it is determined that the turn-on and turn-off of LED drive chip, realize and inhibit LED lamp output
The excessively high phenomenon of floating voltage realizes that LED lamp output no-load voltage always works among the reasonable safe range value of design,
Prevent output electrolytic capacitor from roof fall phenomenon occurs.
Detailed description of the invention
Fig. 1 is function structure chart of the present invention.
Fig. 2 is circuit structure diagram of the present invention.
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable；The same or similar label corresponds to same or similar
Component；The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent.
Specific embodiment
The preferred embodiment of invention is described in detail with reference to the accompanying drawing, so that advantages and features of the invention are easier to
It is readily appreciated by one skilled in the art, to make apparent define to protection scope of the present invention.
Embodiment 1
It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage, it as shown in Figure 1: include voltage transformation module 1, LED driving control
The output end of molding block 2, voltage comparison module 3 and rectification module 4, rectification module 4 is connected with the input terminal of voltage transformation module 2
It connects, the input voltage of 4 output protection circuit of rectification module；Voltage transformation module 1 includes transformer 12, LED drive control module 2
Including LED drive chip U1, the first end and second end of the armature winding N1 of transformer 12 is separately connected the input of protection circuit
Switching tube drain D RAIN inside voltage and LED drive chip U1, the first secondary windings N3 connection voltage of transformer 12 compare
The input terminal of module 3, the energization input VCC of the output end connection LED drive chip U1 of voltage comparison module 3.
The present invention is connected by what is be arranged with the energization input VCC of the LED drive chip U1 of LED drive control module 2
The actual value and theoretical value for the floating voltage that LED lamp exports are compared judgement by the voltage comparison module 3 connect, so that it is determined that
The turn-on and turn-off of LED drive chip U1, realization inhibit the phenomenon that LED lamp output no-load overtension, realize that LED lamp is defeated
Floating voltage out always works among the reasonable safe range value of design, prevents output electrolytic capacitor from roof fall phenomenon occurs.
Voltage comparison module 3 of the invention is as shown in Figure 2: including voltage commutation module 31, division module 32, controllable accurate
Source of stable pressure U1 and first capacitor C1, the first end of the first secondary windings N3 of the input terminal and transformer 12 of voltage commutation module 31
It is connected, the output end of voltage commutation module 31 is connected by division module 32 with the reference end R of controllable accurate source of stable pressure U1,
First capacitor C1 and division module 32 are connected in parallel in the output end of voltage commutation module 31, and the second of the first secondary windings N3
The ground terminal GND at end, the anode A of controllable accurate source of stable pressure U1 and LED drive chip U1 is connected to power ground altogether；Controllable accurate is steady
The cathode K of potential source U1 passes through the energization input VCC of the 4th resistance R4 connection LED drive chip U1.Wherein, voltage commutation module
31 include the first diode D1 and first resistor R1 being connected in series, the first secondary windings N3 of anode connection of first diode D1
First end；Division module 32 includes the second resistance R2 and 3rd resistor R3 being connected in series, second resistance R2 and first resistor
R1 is connected in series, and the one end first capacitor C1 connects the node between first resistor R1 and second resistance R2, the other end and third electricity
Resistance R3 is connected to power ground altogether；Section between reference end R the connection second resistance R2 and 3rd resistor R3 of controllable accurate source of stable pressure U1
Point.Wherein, controllable accurate source of stable pressure U1 is TL431 three-terminal voltage-stabilizing pipe.
The working principle of voltage comparison module 3 of the invention: the input voltage of circuit is protected to pass through the first of transformer 12
The floating voltage of the LED lamp exported after secondary windings N3 charges after the rectification of voltage commutation module 31 to first capacitor C1,
Make to generate voltage value U1 on first capacitor C1, then be divided by division module 32, to make controllable accurate source of stable pressure U1
Reference end R obtain a reference voltage U2, by the reference voltage inside reference voltage U2 and controllable accurate source of stable pressure U1 into
Row compares, and sets the floating voltage of LED lamp when designing in reasonable safe range value, reference voltage U2 and reference voltage phase
Deng when the floating voltage of the LED lamp of output is excessively high, the voltage value U1 generated on first capacitor C1 just be will increase, to make
Reference voltage U2 increases, and when reference voltage U2 is greater than reference voltage, controllable accurate source of stable pressure U1 will be connected, and controllable accurate is steady
Current potential on potential source U1 cathode will be pulled to the first power ground, meanwhile, the energization input VCC of LED drive chip U1 is pulled low
To the shutdown threshold voltage being less than inside LED drive chip U1, LED drive chip U1 is enabled to rapidly switch off, realizes and inhibit LED lamp
The excessively high phenomenon of the floating voltage of output, so that the floating voltage of LED lamp output always works at the reasonable safe model of design
It encloses among value.
LED drive control module 2 of the invention is as shown in Figure 2: further including the 5th resistance R5, the 6th resistance R6 and the second electricity
Hold C2, is connect with the switching tube drain D RAIN current monitoring input terminal CS be connected by the 5th resistance R5 inside LED drive chip U1
Power ground, the 6th resistance R6 and the second capacitor C2 are connected in series, the input electricity of the 6th resistance R6 connection protection circuit after series connection
The power supply of the node connection LED drive chip U1 of pressure, the second capacitor C2 connection power ground, the 6th resistance R6 and the second capacitor C2 are defeated
Enter to hold VCC.
Voltage transformation module 1 of the invention is as shown in Figure 2: further including RCD absorbing circuit 11, RC circuit 13, third capacitor
C3 and the 7th resistance R7, RCD absorbing circuit 11 be arranged in transformer 12 armature winding N1 and protection circuit input voltage it
Between, the output end of the first end connection RCD absorbing circuit 11 of the armature winding N1 of transformer 12, the armature winding N1 of transformer 12
Second end connection RCD absorbing circuit 11 input terminal, the first end of the second subprime winding N2 of transformer 12 connects RC circuit
13 input terminal, output end, the anode of third capacitor C3 and the first end of the 7th resistance R7 of RC circuit 13 are connected to protection electricity altogether
The anode on road exports LED+, the cathode and the 7th resistance of the second end of the second subprime winding N2 of transformer 12, third capacitor C3
The second end of R7 with being connected to negative terminal output LED- and the second source of protection circuit altogether.Wherein, third capacitor C3 is polarized electricity
Hold, including electrolytic capacitor.
Rectification module 4 of the invention is as shown in Figure 2: including rectifier bridge and the 4th capacitor C4, the first input end of rectifier bridge
The zero curve N and firewire L of electric main are separately connected with the second input terminal, the ground connection of rectifier bridge terminates third power ground, rectifier bridge
Output end be rectification module output end；The output end of the rectifier bridge also passes through the 4th capacitor C4 and connects the 4th power ground；Whole
It flows and is connected with fuse between the second input terminal and firewire L of bridge, guarantee the safety of access electric main.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that driven including voltage transformation module, LED
Control module and voltage comparison module, the voltage transformation module includes transformer, and the LED drive control module includes LED
Driving chip, the first end and second end of the armature winding of the transformer are separately connected the input voltage and LED of protection circuit
Switching tube drain electrode inside driving chip, the first secondary windings of the transformer connect the input of the voltage comparison module
End, the energization input of the output end connection LED drive chip of the voltage comparison module.
2. according to claim 1 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the voltage
Comparison module includes voltage commutation module, division module and controllable accurate source of stable pressure, the input terminal of the voltage commutation module with
The first end of first secondary windings of the transformer connects, and the output end of the voltage commutation module passes through division module and institute
State the reference end connection of controllable accurate source of stable pressure, the second end of first secondary windings, controllable accurate source of stable pressure anode with
And the ground terminal of LED drive chip connects power ground altogether；The power supply of the cathode connection LED drive chip of the controllable accurate source of stable pressure
Input terminal.
3. according to claim 2 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the voltage
Comparison module further includes first capacitor, and the first capacitor and the division module are connected in parallel in the voltage commutation module
Output end.
4. according to claim 3 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that voltage commutation
Module includes the first diode and first resistor being connected in series, anode the first secondary windings of connection of the first diode
First end.
5. according to claim 4 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the series connection
The second resistance and 3rd resistor of connection, the second resistance and first resistor are connected in series；First capacitor one end connection
Node between the first resistor and second resistance, the other end and the 3rd resistor are connected to power ground altogether；The controllable essence
Node between the reference end connection second resistance and 3rd resistor of close source of stable pressure.
6. according to claim 1 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the LED drives
Dynamic control module further includes the 5th resistance, defeated with the current monitoring of switching tube drain electrode conducting inside the LED drive chip
Enter end and power ground is connect by the 5th resistance.
7. according to claim 1 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the LED drives
Dynamic control module further includes successively input voltage the 6th resistance and the second capacitor that are connected in series with the protection circuit, and described the
The energization input of node connection LED drive chip between six resistance and the second capacitor, the second capacitor after series connection connect power supply
Ground.
8. according to claim 1 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the voltage
Conversion module further includes RCD absorbing circuit and RC circuit, the RCD absorbing circuit be arranged in the armature winding of the transformer with
Between the input voltage of the protection circuit, the first end of the armature winding of the transformer connects the RCD absorbing circuit
Output end, the second end of the armature winding of the transformer connect the input terminal of the RCD absorbing circuit；The of the transformer
The first end of secondary stage winding by the anode output of protection circuit described in RC circuit connection, the second subprime of the transformer around
The second end of group connects the negative terminal output of the protection circuit.
9. according to claim 8 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that the voltage
Conversion module further includes third capacitor, and the output end and the protection circuit of the anode connection RC circuit of the third capacitor are just
Node between the output of end, the second end of the second subprime winding of the cathode and transformer of the third capacitor are connected to institute altogether
With stating negative terminal output and the second source of protection circuit.
10. according to claim 1 can inhibit the excessively high LED drive circuit of floating voltage, which is characterized in that further include whole
Flow module, the output end of the rectification module are connected with the input terminal of the voltage transformation module, the rectification module output
Protect the input voltage of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810453762.5A CN109287025A (en) | 2018-05-14 | 2018-05-14 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810453762.5A CN109287025A (en) | 2018-05-14 | 2018-05-14 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
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| Publication Number | Publication Date |
|---|---|
| CN109287025A true CN109287025A (en) | 2019-01-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810453762.5A Pending CN109287025A (en) | 2018-05-14 | 2018-05-14 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112566343A (en) * | 2020-12-02 | 2021-03-26 | 浙江凯耀照明有限责任公司 | No-load protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871762A (en) * | 2003-07-29 | 2006-11-29 | 雅达电子国际有限公司 | Switching-bursting method and apparatus for reducing standby power and improving load regulation in a DC-DC converter |
| CN204539566U (en) * | 2015-03-31 | 2015-08-05 | 长治市华光光电科技集团有限公司 | A kind of New LED driving power |
| CN208143543U (en) * | 2018-05-14 | 2018-11-23 | 惠州市西顿工业发展有限公司 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
-
2018
- 2018-05-14 CN CN201810453762.5A patent/CN109287025A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871762A (en) * | 2003-07-29 | 2006-11-29 | 雅达电子国际有限公司 | Switching-bursting method and apparatus for reducing standby power and improving load regulation in a DC-DC converter |
| CN204539566U (en) * | 2015-03-31 | 2015-08-05 | 长治市华光光电科技集团有限公司 | A kind of New LED driving power |
| CN208143543U (en) * | 2018-05-14 | 2018-11-23 | 惠州市西顿工业发展有限公司 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112566343A (en) * | 2020-12-02 | 2021-03-26 | 浙江凯耀照明有限责任公司 | No-load protection circuit |
| CN112566343B (en) * | 2020-12-02 | 2023-02-17 | 浙江凯耀照明有限责任公司 | No-load protection circuit |
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