CN205005320U - Driving circuit of light -emitting diode (LED) fluorescent tube - Google Patents
Driving circuit of light -emitting diode (LED) fluorescent tube Download PDFInfo
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- CN205005320U CN205005320U CN201520805332.7U CN201520805332U CN205005320U CN 205005320 U CN205005320 U CN 205005320U CN 201520805332 U CN201520805332 U CN 201520805332U CN 205005320 U CN205005320 U CN 205005320U
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- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 claims description 42
- 239000011324 bead Substances 0.000 claims description 19
- 230000009466 transformation Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model discloses a driving circuit of light -emitting diode (LED) fluorescent tube, it is including the excessive pressure current foldback circuit who is used for preventing fluorescent tube and/or voltage too big damage too big because of the electric current, inputing only, high frequency current produce induced voltage's frequency detection circuitry when, a galvanic rectification filter circuit for inciting somebody to action low -frequency AC electricity or high -frequency ac electricity change no clutter into, a BUCK reduction voltage circuit for being directed at rectification filter outlet's direct current steps down with the operating voltage who obtains the LED lamp pearl group among the LED fluorescent tube, a high frequency direct circuit for shielding the PWM switch circuit in the BUCK reduction voltage circuit works with the direct control BUCK reduction voltage circuit, the advantage is that the LED fluorescent tube who adopts this drive circuit can directly use the commercial power, also can replace traditional fluorescent tube work of taking electronic ballast as replacement type fluorescent tube, and it is very convenient to use, and can not burn out the fluorescent tube because of the misconnection.
Description
Technical field
The utility model relates to a kind of LED lamp, especially relates to a kind of LED daylight lamp tube drive circuit.
Background technology
LED fluorescent lamp tube as T6, T8 fluorescent tube, because of energy-saving and environmental protection, life-span long accreditation and the extensive use having obtained market.LED fluorescent lamp tube on market can directly use civil power to light, and also can replace traditional fluorescent tube.Traditional fluorescent tube and LED fluorescent lamp tube are different on drive circuit.
The voltage of civil power is generally 110V or 220V, and corresponding frequency is 60Hz or 50Hz, and traditional fluorescent tube needs starter or ballast to light, and the fluorescent tube of use ballast will far more than the fluorescent tube using starter.For T8 and following fluorescent tube, general use electric ballast, civil power is converted to high-frequency current (frequency is more than 20kHz) and produces instantaneous pressure (more than 400V) to light fluorescent tube by electric ballast, and after lighting fluorescent tube, voltage drop is low to moderate about 100V.
Use the LED fluorescent lamp tube of civil power can adopt single-ended transmission of electricity, both-end also can be adopted to transmit electricity, and the LED fluorescent lamp tube of replaced type must adopt both-end to transmit electricity.In technology in the past, LED fluorescent lamp tube can only use civil power or can only use the LED fluorescent lamp tube of replaced type, and both can not use with, otherwise can burn out fluorescent tube.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of LED daylight lamp tube drive circuit, and it can make LED fluorescent lamp tube directly can use civil power, also can as the LED fluorescent lamp tube of replaced type.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of LED daylight lamp tube drive circuit, it is characterized in that comprising the over-voltage over-current protection circuit for preventing fluorescent tube from damaging because electric current is excessive and/or voltage is excessive, the frequency detection circuit of induced voltage is only produced when high-frequency current inputs, for low frequency ac or high-frequency alternating current being changed into the galvanic current rectifying and wave filtering circuit without clutter, direct current for exporting described current rectifying and wave filtering circuit carries out step-down to obtain the BUCK reduction voltage circuit of the operating voltage of the LED lamp bead group in LED fluorescent lamp tube, for shielding PWM switching circuit in described BUCK reduction voltage circuit directly to control the high frequency direct circuit of described BUCK reduction voltage circuit work, the high-frequency alternating current that input access city's low frequency ac of described over-voltage over-current protection circuit or electric ballast export, the output of described over-voltage over-current protection circuit is connected with the input of described frequency detection circuit, an output of described frequency detection circuit is connected with the input of described current rectifying and wave filtering circuit, another output of described frequency detection circuit is connected with the input of described high frequency direct circuit, the output of described current rectifying and wave filtering circuit is connected with the input of described BUCK reduction voltage circuit, the output of described high frequency direct circuit is connected with the control end of described BUCK reduction voltage circuit, the output of described BUCK reduction voltage circuit is connected with the LED lamp bead group in LED fluorescent lamp tube.
When described over-voltage over-current protection circuit accesses city's low frequency ac, the alternating voltage that described over-voltage over-current protection circuit exports and alternating current enter described frequency detection circuit, the filtered alternating voltage that described frequency detection circuit exports and alternating current enter described current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit transformation low frequency ac is the direct current without clutter, the direct voltage that described current rectifying and wave filtering circuit exports and direct current enter described BUCK reduction voltage circuit, described BUCK reduction voltage circuit is down to the operating voltage needed for LED lamp bead group in LED fluorescent lamp tube to the direct voltage that described current rectifying and wave filtering circuit exports, LED lamp bead group in the direct voltage drive LED fluorescent lamp tube that described BUCK reduction voltage circuit exports is luminous,
During the high-frequency alternating current that described over-voltage over-current protection circuit access electric ballast exports, the alternating voltage that described over-voltage over-current protection circuit exports and alternating current enter described frequency detection circuit, the filtered alternating voltage that described frequency detection circuit exports and alternating current enter described current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit transformation high-frequency alternating current is the direct current without clutter, the direct voltage that described current rectifying and wave filtering circuit exports and direct current enter described BUCK reduction voltage circuit, frequency detection circuit simultaneously produces induced voltage and the induced voltage that described frequency detection circuit produces enters described high frequency direct circuit, BUCK reduction voltage circuit described in described high frequency direct circuit controls is down to the operating voltage needed for LED lamp bead group in LED fluorescent lamp tube to the direct voltage that described current rectifying and wave filtering circuit exports, LED lamp bead group in the direct voltage drive LED fluorescent lamp tube that described BUCK reduction voltage circuit exports is luminous.
Compared with prior art, the utility model has the advantage of: this drive circuit successively by changing direct current into after over-voltage over-current protection circuit, frequency detection circuit and current rectifying and wave filtering circuit, then carries out the work of step-down driving LED lamp pearl group by BUCK reduction voltage circuit to direct current to low frequency ac; To high-frequency alternating current successively by changing direct current into after over-voltage over-current protection circuit, frequency detection circuit and current rectifying and wave filtering circuit; and in frequency detection circuit, produce induced voltage enter high frequency direct circuit; high frequency direct circuit carries out the work of step-down driving LED lamp pearl group according to induced voltage control BUCK reduction voltage circuit to direct current; therefore the LED fluorescent lamp tube of this drive circuit is adopted directly can to use civil power; also traditional fluorescent tube work of tube with electronic ballast can be replaced as replaced type fluorescent tube; very easy to use, and fluorescent tube can not be burnt out because of misconnection.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of LED daylight lamp tube drive circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
A kind of LED daylight lamp tube drive circuit that the utility model proposes, as shown in the figure, it comprises the over-voltage over-current protection circuit 1 for preventing fluorescent tube from damaging because electric current is excessive and/or voltage is excessive, the frequency detection circuit 2 of induced voltage is only produced when high-frequency current inputs, for low frequency ac or high-frequency alternating current being changed into the galvanic current rectifying and wave filtering circuit 3 without clutter, direct current for exporting current rectifying and wave filtering circuit 3 carries out step-down to obtain the BUCK reduction voltage circuit 4 of the operating voltage of the LED lamp bead group 6 in LED fluorescent lamp tube, for shielding the high frequency direct circuit 5 that PWM switching circuit in BUCK reduction voltage circuit 4 works with direct control BUCK reduction voltage circuit 4, the high-frequency alternating current that input access city's low frequency ac of over-voltage over-current protection circuit 1 or electric ballast export, the output of over-voltage over-current protection circuit 1 is connected with the input of frequency detection circuit 2, an output of frequency detection circuit 2 is connected with the input of current rectifying and wave filtering circuit 3, another output of frequency detection circuit 2 is connected with the input of high frequency direct circuit 5, the output of current rectifying and wave filtering circuit 3 is connected with the input of BUCK reduction voltage circuit 4, the output of high frequency direct circuit 5 is connected with the control end of BUCK reduction voltage circuit 4, the output of BUCK reduction voltage circuit 4 is connected with the LED lamp bead group 6 in LED fluorescent lamp tube.
The operation principle of this drive circuit is: when over-voltage over-current protection circuit 1 accesses city's low frequency ac, LED fluorescent lamp tube is single ended input, input is two terminals of any one end of fluorescent tube, and two of the other end of fluorescent tube terminals are in series with decompression capacitor respectively, there is the function preventing electrical shock protection, the alternating voltage that over-voltage over-current protection circuit 1 exports and alternating current enter frequency detection circuit 2, owing to being low-frequency current (50 or 60Hz), the filtered alternating voltage that frequency detection circuit 2 exports and alternating current enter current rectifying and wave filtering circuit 3, it is direct current without clutter that current rectifying and wave filtering circuit 3 changes low frequency ac, the direct voltage that current rectifying and wave filtering circuit 3 exports and direct current enter BUCK reduction voltage circuit 4, the direct voltage (about 300V) that BUCK reduction voltage circuit 4 pairs of current rectifying and wave filtering circuits 3 export is down to the operating voltage (as 70V) needed for LED lamp bead group 6 in LED fluorescent lamp tube, LED lamp bead group 6 in the direct voltage drive LED fluorescent lamp tube that BUCK reduction voltage circuit 4 exports is luminous, when over-voltage over-current protection circuit 1 accesses the high-frequency alternating current (being greater than 20kHz) of electric ballast output, LED fluorescent lamp tube is double-width grinding, input is four terminals of lamp tube ends, the alternating voltage that over-voltage over-current protection circuit 1 exports and alternating current enter frequency detection circuit 2, the filtered alternating voltage that frequency detection circuit 2 exports and alternating current enter current rectifying and wave filtering circuit 3, it is direct current without clutter that current rectifying and wave filtering circuit 3 changes high-frequency alternating current, the direct voltage that current rectifying and wave filtering circuit 3 exports and direct current enter BUCK reduction voltage circuit 4, simultaneously owing to being high-frequency current, therefore frequency detection circuit 2 produce induced voltage and frequency detection circuit 2 produce induced voltage enter high frequency direct circuit 5, the direct voltage (about 300V) that high frequency direct circuit 5 control BUCK reduction voltage circuit 4 pairs of current rectifying and wave filtering circuits 3 export is down to the operating voltage (as 70V) needed for LED lamp bead group 6 in LED fluorescent lamp tube, LED lamp bead group 6 in the direct voltage drive LED fluorescent lamp tube that BUCK reduction voltage circuit 4 exports is luminous.
In this particular embodiment, over-voltage over-current protection circuit 1 adopts prior art, and it comprises fuse and piezo-resistance, and fuse can prevent electric current excessive, and when electric current is excessive, fuse melts causes open circuit; Piezo-resistance can prevent overtension, and during overtension, resistance reduces, and shares larger voltage, thus the circuit devcie of protection rear end.
In this particular embodiment, frequency detection circuit 2 adopts prior art, it comprises electric capacity and two common mode inductances, electric capacity has filter function, filtering low electric current, and inductance also has filter function, filter high-frequency electric current, therefore frequency detection circuit 2 can be made a response to the input current of different frequency, and when inputting low-frequency current as civil power (frequency is 50Hz or 60Hz), frequency detection circuit 2 is equivalent to electromagnetic interface filter, it is a kind of low-pass filter circuit, low-frequency current easily passes through, and hinder high-frequency current to pass through, namely frequency detection circuit 2 does not react; And when inputting the high-frequency current (frequency is greater than 20kHz) that high-frequency current exports as electric ballast, frequency detection circuit 2 can prevent high-frequency current from flowing to low-pressure end, and common mode inductance wherein produces induced electromotive force, induced electromotive force drives high frequency direct circuit 5 to work through over commutation and voltage stabilizing.
In this particular embodiment, current rectifying and wave filtering circuit 3 adopts prior art, and it comprises rectification circuit and filter circuit, and rectification circuit comprises the rectifier bridge be made up of multiple rectifier diode, interchange can be transformed into direct current; Filter circuit is the C-L-C filter circuit be made up of electric capacity and inductance, capacitive filter low frequency, and inductance filter high-frequency, this filter circuit is for high power load.
In this particular embodiment, BUCK reduction voltage circuit 4 adopts prior art, it carries out step-down for the direct current exported current rectifying and wave filtering circuit 3, obtain the operating voltage of the LED lamp bead group 6 in LED fluorescent lamp tube, such as, input civil power 220V, obtains the direct voltage of about 300V after rectifying and wave-filtering, and the operating voltage of LED fluorescent lamp tube is generally at about 70V, so need BUCK reduction voltage circuit 4 that the direct voltage of 300V is down to about 70V.
In this particular embodiment, high frequency direct circuit 5 adopts prior art, it comprises current regulator diode, filter capacitor, power MOS pipe, voltage stabilizing didoe and switch MOS pipe, current regulator diode, voltage stabilizing didoe and power MOS pipe form voltage stabilizing circuit, voltage stabilizing circuit driving switch metal-oxide-semiconductor works, high frequency direct circuit 5 is directly communicated with BUCK reduction voltage circuit 4, instead of PWM switching circuit in BUCK reduction voltage circuit 4, and Direct driver BUCK reduction voltage circuit 4 works.
Claims (2)
1. a LED daylight lamp tube drive circuit, it is characterized in that comprising the over-voltage over-current protection circuit for preventing fluorescent tube from damaging because electric current is excessive and/or voltage is excessive, the frequency detection circuit of induced voltage is only produced when high-frequency current inputs, for low frequency ac or high-frequency alternating current being changed into the galvanic current rectifying and wave filtering circuit without clutter, direct current for exporting described current rectifying and wave filtering circuit carries out step-down to obtain the BUCK reduction voltage circuit of the operating voltage of the LED lamp bead group in LED fluorescent lamp tube, for shielding PWM switching circuit in described BUCK reduction voltage circuit directly to control the high frequency direct circuit of described BUCK reduction voltage circuit work, the high-frequency alternating current that input access city's low frequency ac of described over-voltage over-current protection circuit or electric ballast export, the output of described over-voltage over-current protection circuit is connected with the input of described frequency detection circuit, an output of described frequency detection circuit is connected with the input of described current rectifying and wave filtering circuit, another output of described frequency detection circuit is connected with the input of described high frequency direct circuit, the output of described current rectifying and wave filtering circuit is connected with the input of described BUCK reduction voltage circuit, the output of described high frequency direct circuit is connected with the control end of described BUCK reduction voltage circuit, the output of described BUCK reduction voltage circuit is connected with the LED lamp bead group in LED fluorescent lamp tube.
2. a kind of LED daylight lamp tube drive circuit according to claim 1, when it is characterized in that described over-voltage over-current protection circuit access city's low frequency ac, the alternating voltage that described over-voltage over-current protection circuit exports and alternating current enter described frequency detection circuit, the filtered alternating voltage that described frequency detection circuit exports and alternating current enter described current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit transformation low frequency ac is the direct current without clutter, the direct voltage that described current rectifying and wave filtering circuit exports and direct current enter described BUCK reduction voltage circuit, described BUCK reduction voltage circuit is down to the operating voltage needed for LED lamp bead group in LED fluorescent lamp tube to the direct voltage that described current rectifying and wave filtering circuit exports, LED lamp bead group in the direct voltage drive LED fluorescent lamp tube that described BUCK reduction voltage circuit exports is luminous,
During the high-frequency alternating current that described over-voltage over-current protection circuit access electric ballast exports, the alternating voltage that described over-voltage over-current protection circuit exports and alternating current enter described frequency detection circuit, the filtered alternating voltage that described frequency detection circuit exports and alternating current enter described current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit transformation high-frequency alternating current is the direct current without clutter, the direct voltage that described current rectifying and wave filtering circuit exports and direct current enter described BUCK reduction voltage circuit, frequency detection circuit simultaneously produces induced voltage and the induced voltage that described frequency detection circuit produces enters described high frequency direct circuit, BUCK reduction voltage circuit described in described high frequency direct circuit controls is down to the operating voltage needed for LED lamp bead group in LED fluorescent lamp tube to the direct voltage that described current rectifying and wave filtering circuit exports, LED lamp bead group in the direct voltage drive LED fluorescent lamp tube that described BUCK reduction voltage circuit exports is luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520805332.7U CN205005320U (en) | 2015-10-16 | 2015-10-16 | Driving circuit of light -emitting diode (LED) fluorescent tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520805332.7U CN205005320U (en) | 2015-10-16 | 2015-10-16 | Driving circuit of light -emitting diode (LED) fluorescent tube |
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| Publication Number | Publication Date |
|---|---|
| CN205005320U true CN205005320U (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520805332.7U Expired - Fee Related CN205005320U (en) | 2015-10-16 | 2015-10-16 | Driving circuit of light -emitting diode (LED) fluorescent tube |
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| CN (1) | CN205005320U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
| CN111343759A (en) * | 2020-03-30 | 2020-06-26 | 晨辉光宝科技股份有限公司 | LED drive circuit, lamp tube and lighting device |
-
2015
- 2015-10-16 CN CN201520805332.7U patent/CN205005320U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
| CN111343759A (en) * | 2020-03-30 | 2020-06-26 | 晨辉光宝科技股份有限公司 | LED drive circuit, lamp tube and lighting device |
| CN111343759B (en) * | 2020-03-30 | 2022-06-10 | 晨辉光宝科技股份有限公司 | LED drive circuit, lamp tube and lighting device |
| US11770886B2 (en) | 2020-03-30 | 2023-09-26 | Ch Lighting Technology Co., Ltd. | LED driving circuit, light tube and illumination device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |