CN105188188A - Arc prevention circuit of LED lamp tube - Google Patents
Arc prevention circuit of LED lamp tube Download PDFInfo
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- CN105188188A CN105188188A CN201510476095.9A CN201510476095A CN105188188A CN 105188188 A CN105188188 A CN 105188188A CN 201510476095 A CN201510476095 A CN 201510476095A CN 105188188 A CN105188188 A CN 105188188A
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- 238000013021 overheating Methods 0.000 claims abstract description 19
- 238000004020 luminiscence type Methods 0.000 claims description 30
- 239000013078 crystal Substances 0.000 claims description 26
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- 230000003111 delayed effect Effects 0.000 claims description 21
- 238000010891 electric arc Methods 0.000 claims description 18
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Abstract
The invention provides an arc prevention circuit of an LED lamp tube. An over-heating switching circuit and a primary winding of an arc sampling transformer are respectively connected between two input terminals and a rectification circuit of an LED lamp tube. An LED light-emitting assembly and a delay type controllable switch are connected in series and then are connected to the two ends of the high-frequency rectification circuit in parallel. An over-heating protection signal of the over-heating switching circuit and an arc sampling and control signal form an arc protection signal of the circuit that is inputted into a delay type controllable switch circuit. When a temperature of an LED lamp bead is too high or an arc exists at an LED lamp tube pin, the LED light-emitting assembly is turned off. A delay circuit of the delay type controllable switch circuit is not connected to a field effect switching tube until a ballast starting process is completed and then the LED light-emitting assembly is lightened. Therefore, when a fault like an over-current fault, an over-heating fault or an arc fault occurs at the over-heating switching circuit, a warning signal for an alternate on-off phenomenon of the lamp tube is sent out.
Description
Technical field
The present invention relates to field of LED illumination, particularly a kind of arc protection circuit of LED lamp tube.
Background technology
In recent years, the plurality of advantages such as LED illumination efficiency is high because having, the life-span is long, compact and environmental protection and present developing state with rapid changepl. never-ending changes and improvements.The epoch substituting fluorescent lighting with LED illumination arrive.
With in the lighting of tubular fluorescent lamp, utilize original electric ballast as the driver of LED lamp tube, in the process of light fixture transformation, not only can save the LED driver of configure dedicated separately, more can save a large amount of manpowers, this is particularly evident to the country of labour cost costliness.Many LED lamp tube of copying the dimensions of fluorescent tube are commercially there is now, the electric ballast that can adapt to particular type had, what have can adapt to polytype electric ballast, the all right universal electronic ballast had and Inductive ballast, more having can compatible ballast or the ac grid voltage LED of powering.
Around above-mentioned various application, hundreds of patented technology is had to emerge.
The high frequency output of electric ballast is mainly converted to the direct driving current needed for LED around how by early stage patent, does not have other safeguard measures completely.Operating characteristic and the LED of fluorescent lamp have different operating characteristic.Electric ballast is when starting; before setting up stable operating state; must be in light-load state; and when the load of LED as ballast; larger operating current will be presented to ballast in startup moment; this can make some ballast think load short circuits by mistake and enter guard mode, causes fluorescent tube to light.Further, LED is along with the rising of forward voltage, and its operating current exponentially curve rises, and exceed the LED of rated operational current, its life-span will shorten greatly.Too high ambient temperature can cause the LED lost of life equally.Therefore, the cheap safeguard measure LED lamp tube that do not have is unworthy selecting.In order to improve the reliability of this series products, the overheated of LED or overcurrent protection are generally paid attention to.
In patent CN201420114736.7 " alternative of the LED driven with electronic ballast for fluoresent lamp ", add the turn on delay function of the LED when ballast is connected, the reverse-blocking tetrode thyristor of control lifting diac extremely with voltage and RC delays circuit is connected in LED lamp bead string, when ballast is connected, delay LED lamp pearl string is lighted.Because reverse-blocking tetrode thyristor pipe may up to there being the leakage current of can not ignore when ballast starts under the high voltage of 600V, particularly when a ballast drags many LED lamp tube, total larger leakage current still likely causes ballast difficulty in starting.
In patent CN201420395398.9 " circuit overcurrent protection of the LED that a kind of electric ballast drives ", temperature protection circuit has been connected in parallel at LED lamp bead string two ends, LED lamp bead overcurrent and overheated time by the short circuit of LED lamp bead string, to protect LED lamp bead not to be damaged, but still there is the problem of some ballast difficulty in starting; In addition when protective circuit action, by electric current large when having work more normal than LED in fluorescent tube, not only cause meaningless loss; when lamp base or inner connection loose contact; the electric arc caused will damage fluorescent tube further, jeopardize the safety of ballast, even cause fire.
Arc protection technology so far for LED lamp tube there is not yet disclosed data.The arc protection technology of so-called LED lamp tube, refers to when LED lamp tube occurs between lamp base and lamp socket in the course of the work, or electric arc appears in the connector of fluorescent tube inside during because of loose contact, the not impaired technology of LED lamp bead in protection LED lamp tube.
Time loose contact between fluorescent tube lamp base and lamp socket also easily appears at warm swap fluorescent tube.And warm swap fluorescent tube is the most frequent adopted method when transforming in flakes light fixture or keep in repair.Do not possess the LED lamp tube of arc protection function, often just before normal use, insert charged lamp socket just suffer from a flash burn.
When electric ballast drives fluorescent lamp, the protective circuit of electric ballast inside only protects ballast not burnt when there is electric arc, when electric ballast driving LED fluorescent tube, the momentary surges electric current that electric arc produces, directly will damage LED lamp bead.
Summary of the invention
Technical problem to be solved by this invention is between the pin and lamp socket of LED lamp tube; or when there is electric arc because of loose contact in the connector of fluorescent tube inside; LED lamp bead in protection LED lamp tube is not damaged, has LED lamp bead overcurrent simultaneously, the overheated warning waiting defencive function and malfunction.Technical scheme of the present invention is such:
The present invention includes high-frequency rectification circuit (1), delayed type gate-controlled switch circuit (2), LED luminescence component (3), overheating protection circuit (4), arc sampling and control signal form circuit (5) and overheat awitch circuit (6), LED lamp tube is driven by electronic ballast for fluoresent lamp, the high frequency voltage that electronic ballast for fluoresent lamp exports, deliver to two input A of LED lamp tube, B, it is characterized in that, at described high-frequency rectification circuit (1) and described two input A, between B, be connected in series overheat awitch circuit (6) and arc sampling and control signal respectively and form circuit (5), after described LED luminescence component (3) and described delayed type gate-controlled switch circuit (2) are connected in series, be attempted by V+ and the V-two ends that described high-frequency rectification circuit (1) exports, the temperature protection signal that described overheating protection circuit (4) exports and described arc sampling and control signal form the arc protection signal that circuit (5) exports, input the level shifting circuit in described delayed type gate-controlled switch circuit (2) simultaneously, in LED lamp bead overheated or there is electric arc in LED lamp tube lamp base time, switching circuit in level shifting circuit control lag formula gate-controlled switch circuit (2), turn off LED luminescence component (3), subsequently, overheat awitch circuit (6) cuts off the input signal of high-frequency rectification circuit (1), delay circuit in described delayed type gate-controlled switch circuit (2) is when ballast starts, and postpones a period of time, then the switching circuit in switch on delay formula gate-controlled switch circuit (2), and LED luminescence component (3) is lighted.
Described high-frequency rectification circuit (1) is full-wave bridge rectifier circuit, and the high-frequency ac of input electronic ballast for fluoresent lamp, exports the constant current needed for the driving LED lamp pearl string of V+ and V-two ends.
Described delayed type gate-controlled switch circuit (2) comprises delay circuit, level shifting circuit and switching circuit, temperature control resistance R1, divider resistance R6, R7, R2, postpones electric capacity C2, diac D8 and reverse-blocking tetrode thyristor pipe Q2, and formation group holds delay circuit; By crystal switch pipe Q3, Q4 and resistance R10, R11, filter capacitor C6, C7 form level shifting circuit; Field effect transistor switching tube Q1 makes electronic switch; Delay circuit, after ballast completes startup, postpones turn-on field effect crystal switch pipe Q1; Level shifting circuit; the arc protection signal of circuit (5) and the temperature protection signal of overheating protection circuit (4) will be formed from arc sampling and control signal; convert low level to and receive field effect transistor switching tube Q1 control pole; overheated in LED lamp bead; or when there is electric arc in LED lamp tube lamp base; the level of the control pole of field effect transistor switching tube Q1 transfers cut-off level to by conduction level, the described LED luminescence component (3) of instant shutoff.
Described LED luminescence component (3) is made up of LED lamp bead string LEDs and the assistant starting electric capacity C1 be connected in parallel and discharge resistance R3.
Described overheating protection circuit (4) is by limit warm resistance R4 and negative tempperature coefficient thermistor Rt; divider resistance R5 forms voltage divider; warm resistance R4 is limit to be connected with the output V+ of high-frequency rectification circuit (1) by resistance R6, R1; from the voltage swing that divider resistance R5 obtains; the size variation of electric current is flow through with thermistor Rt; after arriving design temperature, export temperature protection signal through isolating diode D5, deliver to level shifting circuit.
It is between the input B and high-frequency rectification circuit (1) of LED lamp tube that described arc sampling and control signal form circuit (5); serial connection arc sampling transformer T1's is elementary; the electric arc fluctuating signal of the secondary acquisition of sampling transformer T1 is through detector diode D6 detection and filter resistance R8 and filter capacitor C5 filtering; after arc stiffness reaches setting; export temperature protection signal through isolating diode D7, deliver to level shifting circuit.
Described overheat awitch circuit (6) is between the input A and described high-frequency rectification circuit (1) of LED lamp tube, serial connection bimetal plate temperature controling switch Kt, temperature detect switch (TDS) Kt is by the control of temperature control resistance R1 temperature, when LED luminescence component (3) is turned off by field effect transistor switching tube Q1, the electric current flowing through temperature control resistance R1 strengthens, the temperature that bimetal plate temperature controling switch Kt experiences temperature control resistance R1 raises and disconnects the signal input of high-frequency rectification circuit (1), a period of time after the electric current vanishing of temperature control resistance R1, bimetal plate temperature controling switch Kt recovers to connect input signal, LED luminescence component (3) postpones to light, under the condition that overheated or/and arc fault exists, described overheat awitch circuit (6) make LED luminescence component (3) in current bright time the failure warning signal that goes out.
By crystal switch pipe Q3 in described delayed type gate-controlled switch circuit (2), Q4 and filter resistance R10, R11, filter capacitor C6, the shutoff control level change-over circuit of C7 composition, can also replace with one-way SCR, the anode of one-way SCR, negative electrode and control pole, be placed in the position of the emitter of crystal switch pipe Q3, the emitter of crystal switch pipe Q4 and the common point of crystal switch pipe Q4 base stage and crystal switch pipe Q3 collector electrode successively.
Advantage of the present invention makes the LED lamp tube driven by fluorescent lamp ballast have the defencive functions such as overcurrent, overheated and arc protection; particularly by while reliably starting during a ballast driven many fluorescent tubes, guarantee that LED lamp bead and ballast are not damaged when various abnormality.
Accompanying drawing explanation
Fig. 1 is principle of the invention circuit diagram.
Number in the figure explanation
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Embodiment
Accompanying drawings, the invention will be further described.
The present invention includes high-frequency rectification circuit (1), delayed type gate-controlled switch circuit (2), LED luminescence component (3), overheating protection circuit (4), arc sampling and control signal form circuit (5) and overheat awitch circuit (6), LED lamp tube is driven by electronic ballast for fluoresent lamp, the high frequency voltage that electronic ballast for fluoresent lamp exports, deliver to two input A of LED lamp tube, B, at described high-frequency rectification circuit (1) and described two input A, between B, be connected in series overheat awitch circuit (6) and arc sampling and control signal respectively and form circuit (5), after described LED luminescence component (3) and described delayed type gate-controlled switch circuit (2) are connected in series, be attempted by V+ and the V-two ends that described high-frequency rectification circuit (1) exports, the temperature protection signal that described overheating protection circuit (4) exports and described arc sampling and control signal form the arc protection signal that circuit (5) exports, input the level shifting circuit in described delayed type gate-controlled switch circuit (2) simultaneously, in LED lamp bead overheated or there is electric arc in LED lamp tube lamp base time, switching circuit in level shifting circuit control lag formula gate-controlled switch circuit (2), turn off LED luminescence component (3), subsequently, overheat awitch circuit (6) cuts off the input signal of high-frequency rectification circuit (1), delay circuit in described delayed type gate-controlled switch circuit (2) is when ballast starts, and postpones a period of time, then the switching circuit in switch on delay formula gate-controlled switch circuit (2), and LED luminescence component is lighted.
The input A of LED lamp tube connects the one end of bimetal plate temperature controling switch Kt in described overheat awitch circuit (6), and the other end of bimetal plate temperature controling switch Kt is connected with the negative pole of the positive pole of rectifier diode D1 and rectifier diode D2.The input B of LED lamp tube connects the pin 2 of arc sampling transformer T1 armature winding, and the pin 1 of arc sampling transformer T1 armature winding is connected with the positive pole of rectifier diode D3 and the negative pole of rectifier diode D4.The negative pole of rectifier diode D1 and the negative pole of rectifier diode D4 link together, form the V+ output of high-frequency rectification circuit, again with one end of the temperature control resistance R1 of described overheat awitch circuit (6), the positive pole of the LED lamp bead string LEDs of described LED luminescence component (3), one end of assistant starting electric capacity C1 and one end of discharge resistance R3 link together.The positive pole of rectifier diode D1 and the positive pole of rectifier diode D4 link together, and form the V-output of high-frequency rectification circuit, and link together publicly.
The other end of the temperature control resistance R1 in described delayed type gate-controlled switch circuit (2) connects one end of divider resistance R6 and the anode A of reverse-blocking tetrode thyristor pipe Q2.The other end of divider resistance R6 and one end of divider resistance R7 and limit one end of warm resistance R4 to link together.The other end of divider resistance R7 connects one end of diac D8, one end of divider resistance R2, and the one end postponing electric capacity C2.The other end of divider resistance R2 and the other end ground connection of delay electric capacity C2.The other end of warm resistance R4 is limit to be connected with one end of negative tempperature coefficient thermistor Rt.The other end of negative tempperature coefficient thermistor Rt and one end of divider resistance R5, one end of filter capacitor C4, and the positive pole of isolating diode links together.The other end of divider resistance R5 and the other end ground connection of filter capacitor C4.The physical location of negative tempperature coefficient thermistor Rt is positioned at field effect transistor switching tube Q1 and drains and near the LED lamp bead negative pole that is close to it; with perception LED lamp bead and field effect transistor switching tube Q1 when causing overcurrent because of small electric arc or other reasons and occur overheating; by limit warm resistance R4 and negative tempperature coefficient thermistor Rt; the voltage that the voltage divider that divider resistance R5 is formed obtains from divider resistance R5 increases; after arriving set point, export temperature protection signal through isolating diode D5.When voltage on divider resistance R5 and filter capacitor C4 presses higher than the voltage stabilizing of voltage stabilizing didoe ZD2; described overheating protection circuit (4) to described delayed type gate-controlled switch circuit (2) by crystal switch pipe Q3; Q4 and filter resistance R10; R11; filter capacitor C7; the shutoff control level change-over circuit of C6 composition exports temperature protection signal, and field effect transistor switching tube Q1 is ended.The limit temperature resistance R4 connected with negative tempperature coefficient thermistor Rt is in order to limit the excursion of negative tempperature coefficient thermistor Rt.
The control pole G of reverse-blocking tetrode thyristor pipe Q2 is connected with the other end of diac D8.The negative electrode K of reverse-blocking tetrode thyristor pipe Q2 and the negative pole of voltage stabilizing didoe ZD1, one end of filter resistance R9, and one end of filter capacitor C3 links together.The other end of filter resistance R9 and the other end ground connection of filter capacitor C3.The positive pole of voltage stabilizing didoe ZD1 and the grid G of field effect transistor switching tube Q1, one end of filter resistance 10, one end of filter capacitor C6, the emitter of crystal switch pipe Q3 links together.The base stage of crystal switch pipe Q3, the collector electrode of crystal switch pipe Q4, the other end of filter capacitor C6 and the other end of filter resistance R11 are connected together.The other end of filter capacitor C6 and filter resistance R11 and the base stage of crystal switch pipe Q3, and the collector electrode of crystal switch pipe Q4 links together.The collector electrode of crystal switch pipe Q3 and the base stage of crystal switch pipe Q4, one end of filter resistance 10, one end of filter capacitor C7, and the positive pole of voltage stabilizing didoe ZD2 links together.The other end of filter resistance 10 and the other end of filter capacitor C7, and the grounded emitter of crystal switch pipe Q4.By crystal switch pipe Q3, Q4 and filter resistance R10, R11, filter capacitor C7, the shutoff control level change-over circuit of C6 composition, the arc protection signal of circuit (5) and the temperature protection signal of described overheating protection circuit (4) will be formed from described arc sampling and control signal, convert to and receive the low level cut-off signals that field effect transistor switching tube Q1 controls pole G, overheated in LED lamp bead, or when there is electric arc in LED lamp tube lamp base, the level of the control pole of field effect transistor switching tube Q1 transfers cut-off level to by conduction level, the described LED luminescence component (3) of instant shutoff.
LED lamp bead string LEDs in described LED luminescence component (3) is by the requirement of total power output, combined by the LED lamp bead parallel/series of respective numbers, the positive pole of LEDs and one end of start-up capacitance C1, and after one end of discharge resistance R3 is connected, be connected to the V+ output of hf rectifier, the negative pole of LEDs and the other end of start-up capacitance C1, and after the other end of discharge resistance R3 is connected, receive the drain D of field effect transistor switching tube Q1.Field effect transistor switching tube Q1 conducting when control pole G is high level, LED lamp bead string is lighted, and field effect transistor switching tube Q1 ends when control pole G is low level, and LED lamp bead string extinguishes.When ballast starts, field effect transistor switching tube Q1 postpones to connect, make ballast obtain enough start-up times, even and if the small leakage current of field effect transistor switching tube when a ballast driven many fluorescent tubes, bring impact also can not to the startup of ballast; In ballast and LED lamp tube normal work period, when trickle or strong electric arc appear in the overheated and lamp base that LED lamp bead overcurrent causes, LED lamp bead string turns off by field effect transistor switching tube Q1 immediately.
Bimetal plate temperature controling switch Kt is close to temperature control resistance R1, disconnects the power supply of ballast input high-frequency rectification circuit when the temperature of temperature control resistance R1 arrives set point.Bimetal plate temperature controling switch Kt perception electric current flow through in temperature control resistance R1 when LED luminescence component (3) turns off is greater than the temperature rise that electric current when LED luminescence component is lighted causes, the power supply that LED lamp tube input A inputs described high-frequency rectification circuit (1) is cut off after LED luminescence component (3) turns off a period of time, after temperature control resistance R1 cools, described LED luminescence component (3) is because obtaining drive current and lighting, as long as the faults such as electric arc still exist, described LED luminescence component (3) will be delayed by shutoff again, " having the hiccups " phenomenon of going out time bright during the LED lamp bead of formation like this, user's light fixture can be warned and there is fault.
The pin 3 of arc sampling transformer T1 secondary winding connects the positive pole of detector diode D6.The negative pole of detector diode D6 and one end of filter resistance R8, one end of filter capacitor C5, and the positive pole of isolating diode D7 is connected together.The pin 4 of arc sampling transformer T1 secondary winding, the other end of filter resistance R8, and the other end ground connection of filter capacitor C5.The negative pole of isolating diode D7 and described overheating protection circuit I(4) in the negative pole of isolating diode D5 and the negative pole of voltage stabilizing didoe ZD2 link together.When the lamp base of fluorescent tube occurs that continuous print intensity reaches the electric arc of setting degree; electric arc impulse commutation voltage on filter resistance R8 and filter capacitor C5 is higher than voltage stabilizing didoe ZD2; described arc sampling and control signal formed circuit (5) to described delayed type gate-controlled switch circuit (2) by crystal switch pipe Q3; Q4 and filter resistance R10; R11; the shutoff control level change-over circuit of filter capacitor C7, C6 composition exports arc protection signal.
Replacing in described delayed type gate-controlled switch circuit (2) by crystal switch pipe Q3 with an one-way SCR, Q4 and filter resistance R10, R11, filter capacitor C6, during the shutoff control level change-over circuit that C7 forms, the anode of one-way SCR is connected with the grid G of the positive pole of voltage stabilizing didoe ZD1 and field effect transistor switching tube Q1, the minus earth of one-way SCR, and the control pole of one-way SCR is connected with the positive pole of voltage stabilizing didoe ZD2.
Claims (8)
1. the arc protection circuit of a LED lamp tube, comprise high-frequency rectification circuit (1), delayed type gate-controlled switch circuit (2), LED luminescence component (3), overheating protection circuit (4), arc sampling and control signal form circuit (5) and overheat awitch circuit (6), LED lamp tube is driven by electronic ballast for fluoresent lamp, the high frequency voltage that electronic ballast for fluoresent lamp exports, deliver to two input A of LED lamp tube, B, it is characterized in that, at described high-frequency rectification circuit (1) and described two input A, between B, be connected in series overheat awitch circuit (6) and arc sampling and control signal respectively and form circuit (5), after described LED luminescence component (3) and described delayed type gate-controlled switch circuit (2) are connected in series, be attempted by V+ and the V-two ends that described high-frequency rectification circuit (1) exports, the temperature protection signal that described overheating protection circuit (4) exports and described arc sampling and control signal form the arc protection signal that circuit (5) exports, input the level shifting circuit in described delayed type gate-controlled switch circuit (2) simultaneously, in LED lamp bead overheated or there is electric arc in LED lamp tube lamp base time, switching circuit in level shifting circuit control lag formula gate-controlled switch circuit (2), turn off LED luminescence component (3), subsequently, overheat awitch circuit (6) cuts off the input signal of high-frequency rectification circuit (1), delay circuit in described delayed type gate-controlled switch circuit (2) is when ballast starts, and postpones a period of time, then the switching circuit in switch on delay formula gate-controlled switch circuit (2), and LED luminescence component (3) is lighted.
2. the arc protection circuit of LED lamp tube according to claim 1, it is characterized in that: described high-frequency rectification circuit (1) is full-wave bridge rectifier circuit, the high-frequency ac of input electronic ballast for fluoresent lamp, exports the constant current needed for the driving LED lamp pearl string of V+ and V-two ends.
3. the arc protection circuit of LED lamp tube according to claim 1, it is characterized in that: described delayed type gate-controlled switch circuit (2) comprises delay circuit, level shifting circuit and switching circuit, temperature control resistance R1, divider resistance R6, R7, R2, postpone electric capacity C2, diac D8 and reverse-blocking tetrode thyristor pipe Q2, formation group holds delay circuit; By crystal switch pipe Q3, Q4 and resistance R10, R11, filter capacitor C6, C7 form level shifting circuit; Field effect transistor switching tube Q1 makes electronic switch; Delay circuit, after ballast completes startup, postpones turn-on field effect crystal switch pipe Q1; Level shifting circuit; the arc protection signal of circuit (5) and the temperature protection signal of overheating protection circuit (4) will be formed from arc sampling and control signal; convert low level to and receive field effect transistor switching tube Q1 control pole; overheated in LED lamp bead; or when there is electric arc in LED lamp tube lamp base; the level of the control pole of field effect transistor switching tube Q1 transfers cut-off level to by conduction level, the described LED luminescence component (3) of instant shutoff.
4. the arc protection circuit of LED lamp tube according to claim 1, is characterized in that: described LED luminescence component (3) is made up of LED lamp bead string LEDs and the assistant starting electric capacity C1 be connected in parallel and discharge resistance R3.
5. the arc protection circuit of LED lamp tube according to claim 1; it is characterized in that: described overheating protection circuit (4) is by limit warm resistance R4 and negative tempperature coefficient thermistor Rt; divider resistance R5 forms voltage divider; warm resistance R4 is limit to be connected with the output V+ of high-frequency rectification circuit (1) by resistance R6, R1; from the voltage swing that divider resistance R5 obtains; the size variation of electric current is flow through with thermistor Rt; after arriving design temperature; export temperature protection signal through isolating diode D5, deliver to level shifting circuit.
6. the arc protection circuit of LED lamp tube according to claim 1; it is characterized in that: it is between the input B and high-frequency rectification circuit (1) of LED lamp tube that described arc sampling and control signal form circuit (5); serial connection arc sampling transformer T1's is elementary; the electric arc fluctuating signal of the secondary acquisition of sampling transformer T1 is through detector diode D6 detection and filter resistance R8 and filter capacitor C5 filtering; after arc stiffness reaches setting; export temperature protection signal through isolating diode D7, deliver to level shifting circuit.
7. the arc protection circuit of LED lamp tube according to claim 1, it is characterized in that: described overheat awitch circuit (6) is between the input A and described high-frequency rectification circuit (1) of LED lamp tube, serial connection bimetal plate temperature controling switch Kt, temperature detect switch (TDS) Kt is by the control of temperature control resistance R1 temperature, when LED luminescence component (3) is turned off by field effect transistor switching tube Q1, the electric current flowing through temperature control resistance R1 strengthens, the temperature that bimetal plate temperature controling switch Kt experiences temperature control resistance R1 raises and disconnects the signal input of high-frequency rectification circuit (1), a period of time after the electric current vanishing of temperature control resistance R1, bimetal plate temperature controling switch Kt recovers to connect input signal, LED luminescence component (3) postpones to light, under the condition that overheated or/and arc fault exists, described overheat awitch circuit (6) make LED luminescence component (3) in current bright time the failure warning signal that goes out.
8. the arc protection circuit of LED lamp tube according to claim 3, it is characterized in that: by crystal switch pipe Q3 in described delayed type gate-controlled switch circuit (2), Q4 and filter resistance R10, R11, filter capacitor C6, the shutoff control level change-over circuit of C7 composition, can also replace with an one-way SCR, the anode of one-way SCR, negative electrode and control pole, be placed in the position of the emitter of crystal switch pipe Q3, the emitter of crystal switch pipe Q4 and the common point of crystal switch pipe Q4 base stage and crystal switch pipe Q3 collector electrode successively.
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| CN201510476095.9A CN105188188A (en) | 2015-08-06 | 2015-08-06 | Arc prevention circuit of LED lamp tube |
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| CN201510476095.9A CN105188188A (en) | 2015-08-06 | 2015-08-06 | Arc prevention circuit of LED lamp tube |
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| CN105188188A true CN105188188A (en) | 2015-12-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI886702B (en) * | 2023-12-21 | 2025-06-11 | 威力暘電子股份有限公司 | Voltage stabilizer for car lamps |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070029943A1 (en) * | 2003-09-12 | 2007-02-08 | Erhardt Robert A | Ballast with lampholder arc protection |
| WO2008033219A2 (en) * | 2006-09-15 | 2008-03-20 | Osram Sylvania Inc. | Ballast with arc protection circuit |
| CN101959358A (en) * | 2010-11-09 | 2011-01-26 | 上海阿卡得电子有限公司 | Anti-arc electronic ballast of series resonance instant start type |
| CN102548169A (en) * | 2010-12-22 | 2012-07-04 | 禧荣有限公司 | Passive Arc Protection Devices for Fluorescent Lamp Ballasts |
| CN203859899U (en) * | 2014-03-14 | 2014-10-01 | 张秀红 | Replacing device employing fluorescent lamp electronic ballast to drive LED lamp |
| CN204046904U (en) * | 2014-08-19 | 2014-12-24 | 上海阿卡得电子有限公司 | A kind of electronic ballast for fluoresent lamp arc suppressing circuit |
| CN204090219U (en) * | 2014-07-17 | 2015-01-07 | 张秀红 | A kind of overheating protection circuit of LED |
-
2015
- 2015-08-06 CN CN201510476095.9A patent/CN105188188A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070029943A1 (en) * | 2003-09-12 | 2007-02-08 | Erhardt Robert A | Ballast with lampholder arc protection |
| WO2008033219A2 (en) * | 2006-09-15 | 2008-03-20 | Osram Sylvania Inc. | Ballast with arc protection circuit |
| CN101959358A (en) * | 2010-11-09 | 2011-01-26 | 上海阿卡得电子有限公司 | Anti-arc electronic ballast of series resonance instant start type |
| CN102548169A (en) * | 2010-12-22 | 2012-07-04 | 禧荣有限公司 | Passive Arc Protection Devices for Fluorescent Lamp Ballasts |
| CN203859899U (en) * | 2014-03-14 | 2014-10-01 | 张秀红 | Replacing device employing fluorescent lamp electronic ballast to drive LED lamp |
| CN204090219U (en) * | 2014-07-17 | 2015-01-07 | 张秀红 | A kind of overheating protection circuit of LED |
| CN204046904U (en) * | 2014-08-19 | 2014-12-24 | 上海阿卡得电子有限公司 | A kind of electronic ballast for fluoresent lamp arc suppressing circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI886702B (en) * | 2023-12-21 | 2025-06-11 | 威力暘電子股份有限公司 | Voltage stabilizer for car lamps |
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Application publication date: 20151223 |