CN201854483U - LED fluorescent tube driving power source - Google Patents
LED fluorescent tube driving power source Download PDFInfo
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- CN201854483U CN201854483U CN2010205895439U CN201020589543U CN201854483U CN 201854483 U CN201854483 U CN 201854483U CN 2010205895439 U CN2010205895439 U CN 2010205895439U CN 201020589543 U CN201020589543 U CN 201020589543U CN 201854483 U CN201854483 U CN 201854483U
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Abstract
The utility model relates to a power circuit, in particular to an LED fluorescent tube driving power source, which comprises an overvoltage and overcurrent protecting circuit, a rectifying module, a passive PFC (power factor correction) circuit and a constant-current driving module. Two ends of input alternating current are connected to an input end of the rectifying module after flowing through the overvoltage and overcurrent protecting circuit and then pass through the passive PFC circuit and the constant-current driving module, and output of the constant-current driving module is connected with an LED fluorescent tube. The LED fluorescent tube driving power source is high in power factor, can realize constant current within a larger voltage range, and prolongs the service life of the LED fluorescent tube.
Description
Technical field
[0001] the utility model relates to a kind of power circuit, particularly relates to a kind of LED fluorescent tube driving power.
Background technology
[0002] effective light source is very popular in the whole world as a kind of light is soft for fluorescent lamp, no matter be in household, shop, office, school, supermarket, hospital, arenas, or at commercial refrigerator-freezer, advertising lamp box, subway, pedestrian tunnel, civil air defense constructions and installations, night market lamp decoration illuminating lamp, as long as need the place of illumination all can see fluorescent lamp.
At present, the LED technical development is swift and violent, the LED fluorescent lamp will progressively replace common fluorescent lamp, at this moment because there is following advantage in LED etc.: 1, fail safe is good, semiconductor light-emitting-diode is the solid state device that organic resin and semi-conducting material, metal material encapsulate, firm in structure, loosening, broken situation can not take place to produce during normal the use, and this luminous element is a cold light source, drive circuit does not have high voltage yet, therefore, can not cause related accident with broken back internal high voltages by Yin Gaowen, so fail safe is better; 2, physical life is long, the luminous efficiency height; 3, drive and regulation and control convenient, the LED lamp is a current-type driver spare, changes the current value that flows through the LED lamp and just can change luminosity, therefore, drives and regulates and control all very convenient; 4, aster does not have heavy metal pollution, is beneficial to environmental protection.These advantages have determined light emitting semiconductor device will develop into the novel illumination light source.Yet the novel semi-conductor light source needs the special driving circuit to guarantee its operate as normal, and it is extremely important therefore to carry out drive circuit.High-power LED drive circuit in the market, generally all adopt the constant voltage type of drive, the shortcoming of this type of drive is the variation along with circuital current, the luminosity of each LED is inconsistent, the electric current of entire circuit is increased, and then cause the damage or the reduction in useful life of whole LED lamp group.
Summary of the invention
This uses novel technical problem to be solved is exactly to overcome the defective that exists in the prior art, provides a kind of precision of steady current higher, can protect the LED fluorescent tube driving power of LED fluorescent tube operating state.
For solving the problems of the technologies described above; the technical solution of the utility model is: a kind of LED fluorescent tube driving power; contain overvoltage; current foldback circuit; rectification module and metal-oxide-semiconductor; the two ends of input AC electricity are through overvoltage; connect the input of rectification module after the overcurrent protection; this driving power circuit also comprises constant-current driven module; constant-current driven module comprises constant-flow driver; metal-oxide-semiconductor and testing circuit; be connected with the power end VDD of constant-flow driver after the galvanic anodal process voltage stabilizing circuit after over commutation; the source electrode of metal-oxide-semiconductor connects the OUT end of constant-flow driver; the grid of metal-oxide-semiconductor meets the VDD of constant-flow driver; constant-flow driver; metal-oxide-semiconductor and inductance L M1; diode D4 forms reduction voltage circuit jointly; the LED fluorescent tube is connected on the output of reduction voltage circuit, and the voltage at LED fluorescent tube two ends is through feeding back to the DIM end of constant-flow driver after the testing circuit.
The RT end of described constant-flow driver is by resistance R T1 ground connection, the CS end of constant-flow driver is by sampling resistor ground connection, described reduction voltage circuit is the BUCK reduction voltage circuit, diode D4 and inductance L M1, two ends, LM2 series connection back are as output termination LED fluorescent tube, the negative pole of diode D4 connects the positive pole through output DC after the passive passive PFC circuit, node between the positive pole of diode D4 and the inductance L M2 connects the drain electrode of metal-oxide-semiconductor Q1, be connected to compensating circuit between the DIM end of described testing circuit and constant-flow driver, wherein, testing circuit has resistance R 7, R8, form with triode Q2, compensating circuit has resistance R 9, triode Q3, with capacitor C 5, C4 forms, the negative pole of LED fluorescent tube connects the base stage of triode Q2 by resistance R 8, the positive pole of LED fluorescent tube connects the emitter of triode Q2 by resistance R 7, the collector electrode of triode Q2 and triode Q3 base stage be connected, the base stage of triode Q3 is by resistance R 9 ground connection, capacitor C 5 is attempted by the two ends of resistance R 9, the grounded emitter of triode Q3, the collector electrode of triode Q3 connects the DIM end of constant-flow driver, and the node of the collector electrode of triode Q3 and constant-current driven chip DIM end is by capacitor C 4 ground connection.
Described voltage stabilizing circuit has resistance R 1, R2, R3, R4, capacitor C 2, C3 and voltage-stabiliser tube DZ1 constitute, galvanic positive pole connects the negative pole of voltage stabilizing didoe DZ1 successively through resistance R 1, R2, R3, the plus earth of voltage stabilizing didoe DZ1, resistance R 4 and capacitor C 2 are attempted by the two ends of voltage stabilizing didoe DZ1 respectively, node between resistance R 2 and the resistance R 3 is by capacitor C 3 ground connection, node between voltage stabilizing didoe DZ1 and the resistance R 3 meets VDD, and the node between resistance R 2 and the resistance R 3 meets the LN of constant-flow driver.
In this LED fluorescent tube driving power circuit; between overvoltage, current foldback circuit and rectification module, be connected to EMI/EMC Electro Magnetic Compatibility circuit; between rectification module and constant-current driven module, be connected to passive passive PFC circuit; capacitor C 1 is attempted by the rear end of passive passive PFC circuit, and rectification module has rectifier bridge to constitute.
In this LED fluorescent tube driving power circuit; fuse F1 is serially connected in ac input end and forms overcurrent protection; piezo-resistance VZ1 is attempted by ac input end and forms overvoltage protection; EMI/EMC Electro Magnetic Compatibility circuit comprises safety capacitor C X1; CX2; I shape inductance L D1 and common mode inductance LC1; wherein; safety capacitor C X1 is attempted by the piezo-resistance rear end; connect rectification circuit through I shape inductance L D1 and common mode inductance LC1 afterwards; safety capacitor C X2 is attempted by the rear end of common mode inductance LC1; passive passive PFC circuit module contains capacitor C E1; CE2; resistance R P1; RP2; RP3 and diode D1; D2; D3; capacitor C E1 and diode D1 series connection; diode D3 and capacitor C E2 series connection, the two parallel connection afterwards seals in diode D2 and resistance R P1 between the node of the node of capacitor C E1 and diode D1 and diode D3 and capacitor C E2.
In this LED fluorescent tube driving power circuit, constant-flow driver adopts constant-current driven chip DP2808.
The beneficial effects of the utility model are:
1) is connected to passive passive PFC circuit in this LED fluorescent tube drive circuit, power factor is greatly improved.
2) this LED fluorescent tube drive circuit carries out constant-current driving by constant-current driven module, has guaranteed the current constant by this LED fluorescent tube, thereby the maximum functional performance of performance LED fluorescent tube in the useful life of prolongation LED fluorescent tube, reduces light decay.
Description of drawings
Fig. 1 is a LED fluorescent tube driving power principle schematic.
Embodiment
As shown in Figure 1; among the figure; 1 is overvoltage, current foldback circuit module, and 2 is EMI/EMC Electro Magnetic Compatibility circuit module, and 3 is rectification module; 4 is passive passive type PWF circuit module; 5 is the constant-current drive circuit module, and 6 is Voltage stabilizing module, and 7 is the BUCK reduction voltage circuit; 8 is testing circuit, and 9 is compensating circuit.The alternating current U of input passes through overvoltage, current foldback circuit module 1 successively, EMI/EMC Electro Magnetic Compatibility circuit module 2, rectification module 3, passive passive type PWF circuit module 4 and constant-current drive circuit module 5 back output termination LED fluorescent tubes.Wherein constant-current drive circuit module 5 comprises Voltage stabilizing module 6, BUCK reduction voltage circuit 7, testing circuit module 8 and compensating circuit module 9.
Fuse F1 is connected on input and forms overcurrent protection, and the rear portion of piezo-resistance VZ1 input fuse in parallel F1 forms overvoltage protection.EMI/EMC Electro Magnetic Compatibility circuit module 2 is connected in parallel on the rear end of piezo-resistance VZ1.EMI/EMC Electro Magnetic Compatibility circuit module 2 comprises safety capacitor C X1, CX2, I shape inductance L D1 and common mode inductance LC1, wherein, safety capacitor C X1 is attempted by the piezo-resistance rear end, process I shape inductance L D1 and common mode inductance LC1 connect the input of rectification module 3 afterwards, safety capacitor C X2 is attempted by the rear end of common mode inductance LC1, the passive passive PFC circuit module 4 of the output termination of rectification module 3.Passive passive PFC circuit module 4 contains capacitor C E1, CE2, resistance R P1, RP2, RP3 and diode D1, D2, D3, capacitor C E1 and diode D1 series connection, diode D3 and capacitor C E2 series connection, the two parallel connection afterwards seals in diode D2 and resistance R P1 between the node of the node of capacitor C E1 and diode D1 and diode D3 and capacitor C E2.Through behind the passive passive PFC circuit module, the power factor of circuit is improved.
The rear end of passive passive PFC circuit module 4 is incorporated capacitor C 1 into and is carried out filtering, and the positive pole of output DC is through meeting the VDD of the constant-current driven chip DP2808 in the constant-current drive circuit module 5 after the Voltage stabilizing module 6 afterwards.Voltage stabilizing module 6 has resistance R 1, R2, R3, R4, capacitor C 2, C3 and voltage-stabiliser tube DZ1 constitute, galvanic positive pole connects the negative pole of voltage stabilizing didoe DZ1 successively through resistance R 1, R2, R3, the plus earth of voltage stabilizing didoe DZ1, resistance R 4 and capacitor C 2 are attempted by the two ends of voltage stabilizing didoe DZ1 respectively, node between resistance R 2 and the resistance R 3 is by capacitor C 3 ground connection, node between voltage stabilizing didoe DZ1 and the resistance R 3 meets the VDD of DP2808, the node between resistance R 2 and the resistance R 3 connect DP2808 LN.The CS of termination DP2808 end after sampling resistor RS1, RS2, the RS3 parallel connection, other end ground connection.The RT end of DP2808 is by resistance R T1 ground connection, and resistance R T1 is used for being provided with the turn-off time of metal-oxide-semiconductor.The source electrode of the OUT termination metal-oxide-semiconductor of DP2808, the grid of metal-oxide-semiconductor meets the VDD of DP2808 by diode D5, and resistance R 5 is connected in parallel on the two ends of D5.DP2808, metal-oxide-semiconductor, inductance L M1, LM2 and diode D4 form BUCK reduction voltage circuit 7.Inductance L M1, LM2 and diode D4 series connection, output termination LED fluorescent tube, the node between LM2 and the D4 connects the drain electrode of metal-oxide-semiconductor.Capacitor C o1, Co2 and resistance R 6 backs in parallel and at the front end of LED fluorescent tube, wherein, inductance L o1 is serially connected between capacitor C o1 and the Co2.This constant-current drive circuit module also comprises testing circuit module 8 and compensating circuit module 9, and testing circuit module 8 is made up of resistance R 7, R8 and triode Q2, and compensating circuit module 9 has resistance R 9, and triode Q3 and capacitor C 5, C4 form.The negative pole of LED fluorescent tube connects the base stage of triode Q2 by resistance R 8, the positive pole of LED fluorescent tube connects the emitter of triode Q2 by resistance R 7, the collector electrode of triode Q2 and triode Q3 base stage be connected, the base stage of triode Q3 is by resistance R 9 ground connection, capacitor C 5 is attempted by the two ends of resistance R 9, the grounded emitter of triode Q3, the collector electrode of triode Q3 connect the DIM end of DP2808, and the node of the collector electrode of triode Q3 and the DIM of DP2808 end is by capacitor C 4 ground connection.Detect and compensation by output, the DIM end can carry out dynamic temp compensation to system.
Can set the turn-off time of metal-oxide-semiconductor by the value of setting resistance R T1, each cycle begins metal-oxide-semiconductor and opens, electric current up to inductance L M1, LM2 reaches peak value, metal-oxide-semiconductor turn-offs, there is resistance R T1 decision turn-off time, has spent the turn-off time of setting, and metal-oxide-semiconductor is opened again, thereby controlled peak current and average current, making the electric current of input LED is constant.In addition, the pin LN of DP2808 has guaranteed constant current in the very wide again voltage range of system by detecting input voltage.
Claims (6)
1. LED fluorescent tube driving power; contain overvoltage; current foldback circuit; rectification module and metal-oxide-semiconductor; the two ends of input AC electricity are through overvoltage; connect the input of rectification module after the overcurrent protection; it is characterized in that: this driving power circuit also comprises constant-current driven module; constant-current driven module comprises constant-flow driver; metal-oxide-semiconductor and testing circuit; be connected with the power end VDD of constant-flow driver after the galvanic anodal process voltage stabilizing circuit after over commutation; the source electrode of metal-oxide-semiconductor connects the OUT end of constant-flow driver; the grid of metal-oxide-semiconductor meets the VDD of constant-flow driver; constant-flow driver; metal-oxide-semiconductor and inductance L M1; diode D4 forms reduction voltage circuit jointly, and the LED fluorescent tube is connected on the output of reduction voltage circuit, and the voltage at LED fluorescent tube two ends is through feeding back to the DIM end of constant-flow driver after the testing circuit.
2. LED fluorescent tube driving power as claimed in claim 1, it is characterized in that: the RT end of constant-flow driver is by resistance R T1 ground connection, the CS end of constant-flow driver is by sampling resistor ground connection, described reduction voltage circuit is the BUCK reduction voltage circuit, diode D4 and inductance L M1, two ends, LM2 series connection back are as output termination LED fluorescent tube, the negative pole of diode D4 connects the positive pole through output DC after the passive passive PFC circuit, node between the positive pole of diode D4 and the inductance L M2 connects the drain electrode of metal-oxide-semiconductor Q1, be connected to compensating circuit between the DIM end of described testing circuit and constant-flow driver, wherein, testing circuit has resistance R 7, R8, form with triode Q2, compensating circuit has resistance R 9, triode Q3, with capacitor C 5, C4 forms, the negative pole of LED fluorescent tube connects the base stage of triode Q2 by resistance R 8, the positive pole of LED fluorescent tube connects the emitter of triode Q2 by resistance R 7, the collector electrode of triode Q2 and triode Q3 base stage be connected, the base stage of triode Q3 is by resistance R 9 ground connection, capacitor C 5 is attempted by the two ends of resistance R 9, the grounded emitter of triode Q3, the collector electrode of triode Q3 connects the DIM end of constant-flow driver, and the node of the collector electrode of triode Q3 and constant-current driven chip DIM end is by capacitor C 4 ground connection.
3. LED fluorescent tube driving power as claimed in claim 1, it is characterized in that: described voltage stabilizing circuit has resistance R 1, R2, R3, R4, capacitor C 2, C3 and voltage-stabiliser tube DZ1 constitute, galvanic positive pole passes through resistance R 1 successively, R2, R3 connects the negative pole of voltage stabilizing didoe DZ1, the plus earth of voltage stabilizing didoe DZ1, resistance R 4 and capacitor C 2 are attempted by the two ends of voltage stabilizing didoe DZ1 respectively, node between resistance R 2 and the resistance R 3 is by capacitor C 3 ground connection, node between voltage stabilizing didoe DZ1 and the resistance R 3 meets VDD, and the node between resistance R 2 and the resistance R 3 meets the LN of constant-flow driver.
4. LED fluorescent tube driving power as claimed in claim 1; it is characterized in that: between overvoltage, current foldback circuit and rectification module, be connected to EMI/EMC Electro Magnetic Compatibility circuit; between rectification module and constant-current driven module, be connected to passive passive PFC circuit; capacitor C 1 is attempted by the rear end of passive passive PFC circuit, and rectification module has rectifier bridge to constitute.
5. LED fluorescent tube driving power as claimed in claim 4; it is characterized in that: fuse F1 is serially connected in ac input end and constitutes overcurrent protection; piezo-resistance VZ1 is attempted by ac input end and forms overvoltage protection; EMI/EMC Electro Magnetic Compatibility circuit comprises safety capacitor C X1; CX2; I shape inductance L D1 and common mode inductance LC1; wherein; safety capacitor C X1 is attempted by the piezo-resistance rear end; connect rectification circuit through I shape inductance L D1 and common mode inductance LC1 afterwards; safety capacitor C X2 is attempted by the rear end of common mode inductance LC1; passive passive PFC circuit module contains capacitor C E1; CE2; resistance R P1; RP2; RP3 and diode D1; D2; D3; capacitor C E1 and diode D1 series connection; diode D3 and capacitor C E2 series connection; the two parallel connection afterwards seals in diode D2 and resistance R P1 between the node of the node of capacitor C E1 and diode D1 and diode D3 and capacitor C E2.
6. as claim 1 described LED fluorescent tube driving power, it is characterized in that: constant-flow driver adopts constant-current driven chip DP2808.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205895439U CN201854483U (en) | 2010-11-03 | 2010-11-03 | LED fluorescent tube driving power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205895439U CN201854483U (en) | 2010-11-03 | 2010-11-03 | LED fluorescent tube driving power source |
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| Publication Number | Publication Date |
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| CN201854483U true CN201854483U (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205895439U Expired - Fee Related CN201854483U (en) | 2010-11-03 | 2010-11-03 | LED fluorescent tube driving power source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037582A (en) * | 2012-12-18 | 2013-04-10 | 东莞市领冠半导体照明有限公司 | Light-emitted diode (LED) daylight lamp power source compatible with fluorescent lamp system |
| CN104411070A (en) * | 2014-12-10 | 2015-03-11 | 上海康耐司信号设备有限公司 | Protection circuit |
| CN105024568A (en) * | 2015-08-05 | 2015-11-04 | 宁波赛耐比光电科技股份有限公司 | Frequency conversion and constant current BUCK circuit |
-
2010
- 2010-11-03 CN CN2010205895439U patent/CN201854483U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037582A (en) * | 2012-12-18 | 2013-04-10 | 东莞市领冠半导体照明有限公司 | Light-emitted diode (LED) daylight lamp power source compatible with fluorescent lamp system |
| CN104411070A (en) * | 2014-12-10 | 2015-03-11 | 上海康耐司信号设备有限公司 | Protection circuit |
| CN105024568A (en) * | 2015-08-05 | 2015-11-04 | 宁波赛耐比光电科技股份有限公司 | Frequency conversion and constant current BUCK circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shanghai Duken Photoelectric Technology Co., Ltd. Assignor: New vision photoelectric (Zhengzhou) Co., Ltd. Contract record no.: 2012310000153 Denomination of utility model: LED fluorescent tube driving power source Granted publication date: 20110601 License type: Exclusive License Record date: 20120903 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20141103 |
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| EXPY | Termination of patent right or utility model |