CN102510622B - LED (Light Emitting Diode) light tube driving circuit suitable for backup power supply fixture lamp - Google Patents

LED (Light Emitting Diode) light tube driving circuit suitable for backup power supply fixture lamp Download PDF

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CN102510622B
CN102510622B CN201110339169.6A CN201110339169A CN102510622B CN 102510622 B CN102510622 B CN 102510622B CN 201110339169 A CN201110339169 A CN 201110339169A CN 102510622 B CN102510622 B CN 102510622B
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resistance
module
diode
light modulation
output
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CN102510622A (en
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陶伟洪
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ME Electronic Products Ltd
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ME Electronic Products Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention discloses an LED (Light Emitting Diode) lamp tube driving circuit suitable for a backup power supply fixture lamp. The LED lamp tube driving circuit comprises a high-frequency rectifying and filtering module, a working mode detection module, a dimming constant-current driving module and an LED light source module, wherein the high-frequency rectifying and filtering module, the working mode detection module, the dimming constant-current driving module and the LED light source module are mutually connected. The high-frequency rectifying and filtering module includes a protection unit, a rectifier bridge unit and a filtering unit and is used for rectifying and filtering a high-frequency pulse power supply after inversion by a reserve power supply. The filtering unit includes electrolysis conpacitors CE1 and CE2, a difference module inductor Ld2, a common mode inductor T2, capacitors C3A and C3 and a resistor R11. Compared with the prior art, a mains supply rectifying and filtering circuit in the traditional LED fluorescent lamp tube circuit is changed into the high-frequency rectifying and filtering circuit, non-dimming constant-current driving is changed into the dimming constant-current driving, and a working mode detection circuit is added so as to ensure that the LED light source module can normally work in an emergency illumination mode when the backup power supply supplies power to the fixture lamp or a nameplate and the like, thus, the service life of the LED light source module, the fixture lamp or the nameplate can be prolonged; and the LED lamp tube driving circuit is energy-saving and environment-friendly.

Description

Be applicable to the LED lamp tube drive circuit of back-up source Frame lamp
Technical field
The present invention relates to back-up source Frame lamp circuit engineering field, relate in particular to a kind of LED lamp tube drive circuit that is applicable to back-up source Frame lamp.
Background technology
At present, for guaranteeing personal safety, generally in the places such as corridor, escape truck and fire safety passage of commercial mansion, Frame lamp or indication plate are installed.Described Frame lamp or indication plate belong to the emergency lighting product with back-up source powering mode.
This Frame lamp or indication plate general work be in altar lamp state, and in normal illumination and emergency lighting two states.When adopting civil power to power to described Frame lamp or indication plate, it is in normal illumination pattern; When adopting back-up source to power to described Frame lamp or indication plate, it is in emergency lighting pattern.As shown in Figure 1, the circuit of existing Frame lamp or indication plate comprises lamp bracket and fluorescent tube 14 two parts, described lamp bracket partly comprises civil power outage detection and conversion, battery charging module 10, backup battery 13, Inductive ballast 11, starter 12, described backup battery 13, Inductive ballast 11, starter 12 and fluorescent tube 14 are all connected with module 10, and described lamp bracket is accessed by described civil power outage detection and conversion, battery charging module 10 in mains electricity input end.Because this Frame lamp is used conventional fluorescent lamps pipe, power consumption is large, and lamp tube service life is short, is unfavorable for energy-conserving and environment-protective.
Along with scientific and technical development, LED lamp has with it that life-span is long, low in energy consumption, energy-saving effect is obvious etc., and feature is widely used.As shown in Figure 2, for LED being applied to the block diagram of LED fluorescent tube.As shown in the figure, described LED fluorescent tube is comprised of commercial power rectification filter circuit 20, not light modulation constant-current drive circuit 21, LED light source 22, and mains electricity input end is by 20 accesses of described commercial power rectification filtration module.But while designing due to this commercial power rectification filter circuit, only consider low frequency (being less than 1KHz), during for high frequency electric source rectifying and wave-filtering, consume seriously, does not separately possess again dimming function and supply voltage measuring ability.When described LED fluorescent tube is used for to back-up source Frame lamp, mains-supplied can normally be lighted, and because back-up source output power is less, and there will be, extinguishes or scintillation cisco unity malfunction after civil power power-off.
Therefore, be necessary to provide a kind of improved LED lamp tube drive circuit that is applicable to back-up source Frame lamp, while adopting described back-up source to power to product with assurance, LED light source can normally work in emergency lighting pattern, there will not be the situation of continuous flicker, thereby reach the object of power saving, environmental protection, long service life.
Summary of the invention
The object of this invention is to provide a kind of LED lamp tube drive circuit that is applicable to back-up source Frame lamp, while adopting back-up source to power to Frame lamp or indication plate etc. with assurance, LED light source module can normally work in emergency lighting pattern, thereby improve the useful life of described LED light source module and described Frame lamp or indication plate, and energy-saving and environmental protection.
For achieving the above object, the invention provides a kind of LED lamp tube drive circuit that is applicable to back-up source Frame lamp, comprise filtering high-frequency rectifier module, mode of operation detection module, light modulation constant-current driven module and LED light source module, described filtering high-frequency rectifier module is for carrying out rectifying and wave-filtering to civil power and through the high frequency pulse power supply of back-up source inversion, described filtering high-frequency rectifier module comprises protected location, rectifier bridge unit and filter unit, the input of described protected location is the tube lamp holder power interface of back-up source Frame lamp, the output of described protected location is connected with the input of described filter unit by described rectifier bridge unit, the input of the output of described filter unit and described mode of operation detection module, the power input of described light modulation constant-current driven module connects respectively, the output of described mode of operation detection module is connected with described light modulation constant-current driven module, the output of described light modulation constant-current driven module is connected with described LED light source module, wherein said filter unit comprises electrochemical capacitor CE1, CE2, differential mode inductance Ld2, common mode inductance T2, capacitor C 3A, C3 and resistance R 11, described capacitor C 3A is connected with one end of described rectifier bridge unit and described common mode inductance T2, the other end of described common mode inductance T2 is connected with described electrochemical capacitor CE2, described electrochemical capacitor CE1 and capacitor C 3 are parallel with one another, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively, described differential mode inductance Ld2 is in parallel with resistance R 11, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively.
Compared with prior art, because the LED lamp tube drive circuit that is applicable to back-up source Frame lamp of the present invention changes the commercial power rectification filter circuit in existing LED fluorescent lamp tube circuit into rectifier filter circuit, not light modulation constant current is driven and changes light modulation constant current driving into, and increased mode of operation testing circuit, thereby while having guaranteed that employing back-up source is powered to Frame lamp or indication plate etc., LED light source module can normally work in emergency lighting pattern, thereby improve the useful life of described LED light source module and described Frame lamp or indication plate, and energy-conservation, environmental protection.
Particularly, in a preferred embodiment of the present invention, described mode of operation detection module comprises partial pressure unit, reference voltage unit and a comparator, the output of one end of described partial pressure unit and described filtering high-frequency rectifier module, the input of described light modulation constant-current driven module connects, the other end of described partial pressure unit is connected with the in-phase input end of described comparator, one end of described reference voltage unit is connected with an output of described light modulation constant-current driven module, the other end of described reference voltage unit is connected with the inverting input of described comparator, the output of described comparator is connected with described light modulation constant-current driven module by a resistance R 18.
Particularly, described partial pressure unit comprises successively resistance R 13, R14 and the R17 of series connection mutually, and the one end after series connection is connected with the output of described filtering high-frequency rectifier module, the power input of described light modulation constant-current driven module, the other end after series connection is connected with the earth terminal of described comparator, and described resistance R 14 is all connected with the in-phase input end of described comparator with the interconnective one end of R17.
Particularly, described reference voltage unit comprises resistance R 19, diode D9, Dz1 and capacitor C 9, resistance R 19 and diode D9 connect mutually, and the one end after series connection is connected with an output of described light modulation constant-current driven module, the other end after series connection is connected respectively with the inverting input of described comparator, diode Dz1 and capacitor C 9, described diode Dz1 and capacitor C 9 parallel connections, and the one end after parallel connection is connected with the inverting input of described comparator, the other end after parallel connection is connected with the earth terminal of described comparator.
In another preferred embodiment of the present invention, described mode of operation detection module comprises resistance R 13, R14, R17 and diode Dz1, described resistance R 13, R14 connect mutually, and the one end after series connection is connected with the output of described filtering high-frequency rectifier module, the power input of described light modulation constant-current driven module, the other end after series connection is connected with described resistance R 17, diode Dz1, described resistance R 17, diode Dz1 are parallel with one another, and the one end after parallel connection is connected with described light modulation constant-current driven module, resistance R 14, the other end ground connection after parallel connection.
Particularly; described protected location comprises fuse F1 and piezo-resistance Vz1; one end of described fuse F1 is connected with a power interface of the tube lamp holder of back-up source Frame lamp; the other end of described fuse F1 is connected respectively with described piezo-resistance Vz1, described rectifier bridge unit; one end of described piezo-resistance Vz1 is another power interface of the tube lamp holder of back-up source Frame lamp, and the other end of described piezo-resistance Vz1 is connected with described rectifier bridge unit.
Particularly, described rectifier bridge unit comprises diode D4, D5, D6 and D7, the anode of described diode D4 and described fuse F1, the negative electrode of one end of piezo-resistance Vz1 and diode D6 connects respectively, the negative electrode of described diode D4 is connected with negative electrode and the described filter unit of described diode D5, another power interface of the tube lamp holder of the anode of described diode D5 and described back-up source Frame lamp, the negative electrode of the other end of piezo-resistance Vz1 and described diode D7 connects respectively, the anode of described diode D7 is connected respectively with anode and the described filter unit of described diode D6.
Particularly, described light modulation constant-current drive circuit comprises light modulation chip U1, metal-oxide-semiconductor Q1, transformer T1, voltage starting unit and RCD absorption circuit, the output of described mode of operation detection module is connected with the DIM pin of described light modulation chip U1 by a resistance R 18, the GATE pin of described light modulation chip U1 is connected with the G of described metal-oxide-semiconductor Q1 end, the D end of described metal-oxide-semiconductor Q1 is connected with the input of described transformer T1, the input of described voltage starting unit is connected with described filter unit, the output of described voltage starting unit is connected with the power input of described light modulation chip U1, the input of described transformer T1 is also connected to RCD absorption circuit, an output of described transformer T1 is connected with described LED light source module by a rectification circuit, another output of described transformer T1 is by the power input of another rectification circuit and described light modulation chip U1, the power input of described comparator U2B connects.
Particularly, described voltage starting unit comprises resistance R 5, the R6 of mutual series connection, described RCD absorption circuit comprises resistance R 3, R4, capacitor C 4 and diode D2, described resistance R 3 and capacitor C 4 are parallel with one another, and the one end after parallel connection is connected with described resistance R 6, described transformer T1, the other end after parallel connection is connected with one end of described resistance R 4, and the other end of described resistance R 4 is connected with the negative electrode of described diode D2, and the anode of described diode D2 is connected with described transformer T1.
By following description also by reference to the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used for explaining embodiments of the invention.
Accompanying drawing explanation
Fig. 1 is existing back-up source Frame lamp structured flowchart.
Fig. 2 is existing LED lamp works theory diagram.
Fig. 3 is the block diagram that the present invention is applicable to LED lamp tube drive circuit one embodiment of back-up source Frame lamp.
Fig. 4 is the circuit diagram of Fig. 3.
Fig. 5 is the block diagram that the present invention is applicable to another embodiment of LED lamp tube drive circuit of back-up source Frame lamp.
Fig. 6 is the circuit diagram of Fig. 5.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, in accompanying drawing, similarly element numbers represents similar element.As mentioned above, the invention provides a kind of LED lamp tube drive circuit that is applicable to back-up source Frame lamp, because the described LED lamp tube drive circuit that is applicable to back-up source Frame lamp changes the commercial power rectification filter circuit in existing LED fluorescent lamp tube circuit into rectifier filter circuit, not light modulation constant current is driven and changes light modulation constant current driving into, and increased mode of operation testing circuit, thereby while having guaranteed that employing back-up source is powered to Frame lamp or indication plate etc., LED light source module can normally work in emergency lighting pattern, thereby improve the useful life of described LED light source module and described Frame lamp or indication plate, and energy-conservation, environmental protection.
Please refer to Fig. 3 and Fig. 4, an embodiment who is applicable to the LED lamp tube drive circuit of back-up source Frame lamp of the present invention comprises filtering high-frequency rectifier module 30, mode of operation detection module 32, light modulation constant-current driven module 34 and LED light source module 36, the input of described filtering high-frequency rectifier module 30 is connected with tube lamp holder, the input of the output of described filtering high-frequency rectifier module 30 and described operational module detection module 32, the input of described light modulation constant-current driven module 34 connects respectively, the output of described mode of operation detection module 32 is connected with an output of described light modulation constant-current driven module 34, another output of described light modulation constant-current driven module 34 is connected with described LED light source module 36.
Wherein, described filtering high-frequency rectifier module 30 is for to civil power (220V, 50Hz) and through high frequency (the being greater than 10KHz) pulse power of back-up source inversion carry out rectifying and wave-filtering, becoming level and smooth DC high-voltage power supply usings and offers described operational module detection module 32 and light modulation constant-current driven module 34 as operating voltage, it is civil power or stand-by power supply that described mode of operation detection module 32 identifies to detect the power supply of whole product under current state for supply voltage to external world, and export control signal and work in normal illumination or emergency lighting pattern to control described light modulation constant-current driven module 34, described light modulation constant-current driven module 34 is for providing working power to described LED light source module 36.
Wherein, described mode of operation detection module 32 comprises partial pressure unit 321, reference voltage unit 322 and a comparator U2B, the output of one end of described partial pressure unit 321 and described filtering high-frequency rectifier module 30, the input of described light modulation constant-current driven module 34 connects, the other end of described partial pressure unit 321 is connected with the in-phase input end (5 pin) of described comparator U2B, one end of described reference voltage unit 322 is connected with an output of described light modulation constant-current driven module 34, the other end of described reference voltage unit 322 is connected with the inverting input (6 pin) of described comparator U2B, the power input of described comparator U2B (8 pin) is connected with an output of described light modulation constant-current driven module 34, the output of described comparator U2B (7 pin) is connected with described light modulation constant-current driven module 34 by a resistance R 18.Wherein, described reference voltage unit 322 is for providing reference voltage source to described comparator U2B, described partial pressure unit 321 offers described comparator U2B for the supply voltage that comes from filtering high-frequency rectifier module 30 is carried out after dividing potential drop, and it is compared with described reference voltage source.
Particularly, described partial pressure unit 321 comprises successively resistance R 13, R14 and the R17 of series connection mutually, and the one end after series connection is connected respectively with the output of described filtering high-frequency rectifier module 30, the input of described light modulation constant-current driven module 34, the other end after series connection is connected with the earth terminal (4 pin) of described comparator U2B, and described resistance R 14 is all connected with the in-phase input end (5 pin) of described comparator U2B with the interconnective one end of R17.
Particularly, described reference voltage unit 322 comprises resistance R 19, diode D9, Dz1 and capacitor C 9, resistance R 19 and diode D9 connect mutually, and the one end after series connection is connected with an output of described light modulation constant-current driven module 34, the inverting input of the other end after series connection and described comparator U2B (6 pin), diode Dz1 is connected respectively with capacitor C 9, described diode Dz1 and capacitor C 9 parallel connections, and the one end after parallel connection is connected with the inverting input (6 pin) of described comparator U2B, the other end after parallel connection is connected with the earth terminal (4 pin) of described comparator U2B.
Particularly; described filtering high-frequency rectifier module 30 comprises protected location 301, rectifier bridge unit 302 and filter unit 303; the input of described protected location 201 is the power interface of the tube lamp holder of back-up source Frame lamp; the output of described protected location 301 is connected with the input of described filter unit 303 by described rectifier bridge unit 302, and the output of described filter unit 303 is connected respectively with the resistance R 13 of described partial pressure unit 321 and the input VHD of described light modulation constant-current driven module 34.
Particularly; described protected location 301 comprises fuse F1 and piezo-resistance Vz1; one end of described fuse F1 is connected with a power interface (A, B end) of the tube lamp holder of back-up source Frame lamp; the other end of described fuse F1 is connected respectively with described piezo-resistance Vz1, described rectifier bridge unit 302; one end of described piezo-resistance Vz1 is connected with another power interface (C, D end) of the tube lamp holder of back-up source Frame lamp, and the other end of described piezo-resistance Vz1 is connected with described rectifier bridge unit 302.
Particularly, described rectifier bridge unit 302 comprises diode D4, D5, D6 and D7, the anode of described diode D4 and described fuse F1, the negative electrode of one end of piezo-resistance Vz1 and diode D6 connects respectively, the negative electrode of described diode D4 is connected with negative electrode and the described filter unit 303 of described diode D5, another power interface (C of the tube lamp holder of the anode of described diode D5 and described back-up source Frame lamp, D end), the negative electrode of the other end of piezo-resistance Vz1 and described diode D7 connects respectively, the anode of described diode D7 is connected respectively with anode and the described filter unit 303 of described diode D6.
Particularly, described filter unit 303 comprises electrochemical capacitor CE1, CE2, differential mode inductance Ld2, common mode inductance T2, capacitor C 3A, C3 and resistance R 11, described capacitor C 3A is connected with one end of described common mode inductance T2, and one end of described capacitor C 3A and described diode D4, the negative electrode of D5 connects, the other end of described capacitor C 3A and described diode D6, the anodic bonding of D7, the other end of described common mode inductance T2 is connected with described electrochemical capacitor CE2, described electrochemical capacitor CE1 and capacitor C 3 are parallel with one another, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively, described differential mode inductance Ld2 is in parallel with resistance R 11, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively.
Particularly, described light modulation constant-current drive circuit 34 comprises light modulation chip U1, metal-oxide-semiconductor Q1, transformer T1, voltage starting unit 341 and RCD absorption circuit 342, the output of described comparator U2B (7 pin) is connected with the DIM pin of described light modulation chip U1 by a resistance R 18, described DIM pin is by capacitor C 8 ground connection, the GATE pin of described light modulation chip U1 is by resistance R 10, diode D8 formed rectifier circuit parallel with one another is connected with the G end of described metal-oxide-semiconductor Q1, an output of described metal-oxide-semiconductor Q1 is connected with the CS pin of described light modulation chip U1, and by resistance R parallel with one another 15, R16 ground connection, the D end of described metal-oxide-semiconductor Q1 is connected with the input (winding 2 pin) of described transformer T1, the input of described voltage starting unit 241 is connected with the output of described filter unit 303, the output of described voltage starting unit 341 is connected the input of described transformer T1 and is connected to RCD absorption circuit with the power input of described light modulation chip U1, an output of described transformer T1 (winding Ns1 end) is connected with described LED light source module 36 by a rectification circuit 1, another output (winding 3 of described transformer T1, 4 pin) power input (VCC end) with described light modulation chip U1 by another rectification circuit 2, the power input of described comparator U2B (8 pin) connects.The induced voltage that winding 3,4 pin of described transformer T1 produce is for providing the operating voltage of described comparator U2B and described light modulation chip U1.
Wherein, described rectification circuit 1 comprises capacitor C 1, C2, resistance R 1A, R1, R2 diode D1, D1A and electrochemical capacitor C5, described resistance R 1A, R1 is parallel with one another, and the one end after parallel connection is connected with one end of the winding Ns1 end of described transformer T1 by described capacitor C 1, the other end after parallel connection is connected with the other end of the winding Ns1 end of described transformer T1 by described electrochemical capacitor C5, described diode D1, D1A is parallel with one another, and the one end after parallel connection is connected with described capacitor C 1, the other end after parallel connection and described capacitor C 2, resistance R 2 and LED light source module 36 connect, described capacitor C 2 and resistance R 2 are parallel with one another, and the one end after parallel connection and described diode D1, one end after D1A parallel connection connects, the other end of the winding Ns1 end of the other end after parallel connection and described transformer T1, described LED light source module 36 connects.
Described rectification circuit 2 comprises resistance R 7 and the diode D3 of mutual series connection, one end of described resistance R 7 is connected with the resistance R 19 of described reference voltage unit 322, and by capacitor C 7, the R12 ground connection of a resistance R 8 and series connection mutually, one end of described diode D3 is connected with the power input (VCC end) of the power input (8 pin) of described comparator U2B, described light modulation chip U1, and by capacitor C 6 ground connection.
Particularly, described voltage starting unit 341 comprises resistance R 5, the R6 of mutual series connection, described RCD absorption circuit 342 comprises resistance R 3, R4, capacitor C 4 and diode D2, described resistance R 3 and capacitor C 4 are parallel with one another, and the one end after parallel connection and described resistance R 6, described transformer T1(winding 1 pin) be connected, the other end after parallel connection is connected with one end of described resistance R 4, the other end of described resistance R 4 is connected with the negative electrode of described diode D2, the anode of described diode D2 and described transformer T1(winding 2 pin) be connected.The starting resistor of described voltage starting unit 341 for providing described light modulation to drive chip U1 to start working, described RCD absorption circuit 342 is for absorbing the high pressure of described transformer T1.
Preferably, due to LED light source have energy-conservation obviously, the advantage such as the life-span is long, therefore, described LED light source module 36 adopts LED as illuminating source, compared with traditional LED light source module 36, adopt other illuminating sources, more energy-conservation and useful life of having improved whole product.
The operation principle of LED lamp tube drive circuit that the present invention is applicable to back-up source Frame lamp is as follows: when the described LED lamp tube drive circuit that is applicable to back-up source Frame lamp is started working, civil power or through the high frequency pulse power supply of back-up source inversion after described filtering high-frequency rectifier module 30 rectifying and wave-filterings, the high direct voltage of output smoothing, described high direct voltage is input to the in-phase input end (5 pin) of described comparator U2B after described partial pressure unit 321 dividing potential drops, described comparator U2B by the reference voltage that comes from described reference voltage unit 322 with from the voltage of partial pressure unit 321, compare, and export control signal and work in normal illumination or emergency lighting pattern to control described light modulation constant-current driven module 34, described light modulation constant-current driven module 34 is for providing working power to described LED light source module 36.When power supply is civil power (AC power of 220V, 50Hz), direct voltage after its rectifying and wave-filtering is greater than 250V, now described comparator U2B exports high level signal, control described light modulation constant-current driven module 34 and work in 100% brightness and carry out normal illumination, thereby provide to described LED light source module 36 operating current that works in normal illumination; When power supply is when through high frequency (the being greater than 10KHz) pulse power of back-up source inversion, its output power is much smaller than mains-supplied power, direct voltage after its rectifying and wave-filtering is less than 250V, described comparator U2B output LOW voltage signal now, control described light modulation constant-current driven module 34 and work in 20% left and right brightness and carry out emergency lighting, thereby provide to described LED light source module 36 operating current that works in emergency lighting.
Please refer to Fig. 5 and Fig. 6, for the present invention is applicable to another embodiment of the LED lamp tube drive circuit of back-up source Frame lamp, annexation and operation principle thereof in this enforcement between each element are similar to the above embodiments, do not repeat them here.The difference of itself and above-described embodiment is: described mode of operation detection module 32 comprises resistance R 13, R14, R17 and diode Dz1, described resistance R 13, R14 connect mutually, and the one end after series connection is connected with the output of described filtering high-frequency rectifier module 30, the power input of described light modulation constant-current driven module 34, the other end after series connection is connected with described resistance R 17, diode Dz1, described resistance R 17, diode Dz1 are parallel with one another, and the one end after parallel connection is connected with described light modulation constant-current driven module 34, resistance R 14, the other end ground connection after parallel connection.In the present embodiment, the simple dividing potential drop of voltage process that described mode of operation detection module 32 is 30 outputs of filtering high-frequency rectifier module is carried out light modulation to light modulation constant-current driven module 34, and this example is equally applicable to the Frame lamp of back-up source power supply.
Invention has been described for above combination most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain the various modifications of carrying out according to essence of the present invention, equivalent combinations.

Claims (8)

1. a LED lamp tube drive circuit that is applicable to back-up source Frame lamp, it is characterized in that: comprise filtering high-frequency rectifier module, mode of operation detection module, light modulation constant-current driven module and LED light source module, described filtering high-frequency rectifier module is for carrying out rectifying and wave-filtering to civil power or through the high frequency pulse power supply of back-up source inversion, described filtering high-frequency rectifier module comprises protected location, rectifier bridge unit and filter unit, the input of described protected location is the tube lamp holder power interface of back-up source Frame lamp, the output of described protected location is connected with the input of described filter unit by described rectifier bridge unit, the input of the output of described filter unit and described mode of operation detection module, the power input of described light modulation constant-current driven module connects respectively, the output of described mode of operation detection module is connected with described light modulation constant-current driven module, described mode of operation detection module is civil power or back-up source for the supply voltage of described filter unit output is identified to detect current power supply, and to control described light modulation constant-current driven module, work in normal illumination or emergency lighting pattern according to testing result output control signal, the output of described light modulation constant-current driven module is connected with described LED light source module, wherein said filter unit comprises electrochemical capacitor CE1, CE2, differential mode inductance Ld2, common mode inductance T2, capacitor C 3A, C3 and resistance R 11, described capacitor C 3A is connected with one end of described rectifier bridge unit and described common mode inductance T2, the other end of described common mode inductance T2 is connected with described electrochemical capacitor CE2, described electrochemical capacitor CE1 and capacitor C 3 are parallel with one another, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively, described differential mode inductance Ld2 is in parallel with resistance R 11, and one end ground connection after parallel connection, the other end after parallel connection and described common mode inductance T2, one end of electrochemical capacitor CE2 connects respectively.
2. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as claimed in claim 1, it is characterized in that: described mode of operation detection module comprises partial pressure unit, reference voltage unit and a comparator, the output of one end of described partial pressure unit and described filtering high-frequency rectifier module, the power input of described light modulation constant-current driven module connects, the other end of described partial pressure unit is connected with the in-phase input end of described comparator, one end of described reference voltage unit is connected with an output of described light modulation constant-current driven module, the other end of described reference voltage unit is connected with the inverting input of described comparator, the output of described comparator is connected with described light modulation constant-current driven module by a resistance R 18.
3. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as claimed in claim 2, it is characterized in that: described partial pressure unit comprises successively resistance R 13, R14 and the R17 of series connection mutually, and the one end after series connection is connected with the output of described filtering high-frequency rectifier module, the power input of described light modulation constant-current driven module, the other end after series connection is connected with the earth terminal of described comparator, and described resistance R 14 is all connected with the in-phase input end of described comparator with the interconnective one end of R17.
4. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as claimed in claim 2, it is characterized in that: described reference voltage unit comprises resistance R 19, diode D9, Dz1 and capacitor C 9, resistance R 19 and diode D9 connect mutually, and the one end after series connection is connected with an output of described light modulation constant-current driven module, the other end after series connection and the inverting input of described comparator, diode Dz1 is connected respectively with capacitor C 9, described diode Dz1 and capacitor C 9 parallel connections, and the one end after parallel connection is connected with the inverting input of described comparator, the other end after parallel connection is connected with the earth terminal of described comparator.
5. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as claimed in claim 1, it is characterized in that: described mode of operation detection module comprises resistance R 13, R14, R17 and diode Dz1, described resistance R 13, R14 connects mutually, and the one end after series connection and the output of described filtering high-frequency rectifier module, the power input of described light modulation constant-current driven module connects, the other end after series connection and described resistance R 17, diode Dz1 connects, described resistance R 17, diode Dz1 is parallel with one another, and the one end after parallel connection and described light modulation constant-current driven module, resistance R 14 connects, other end ground connection after parallel connection.
6. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as described in claim 2 to 5 any one, it is characterized in that: described protected location comprises fuse F1 and piezo-resistance Vz1, one end of described fuse F1 is connected with a power interface of the tube lamp holder of back-up source Frame lamp, the other end of described fuse F1 and described piezo-resistance Vz1, described rectifier bridge unit connects respectively, one end of described piezo-resistance Vz1 is another power interface of the tube lamp holder of back-up source Frame lamp, the other end of described piezo-resistance Vz1 is connected with described rectifier bridge unit, described rectifier bridge unit comprises diode D4, D5, D6 and D7, the anode of described diode D4 and described fuse F1, the negative electrode of one end of piezo-resistance Vz1 and diode D6 connects respectively, the negative electrode of described diode D4 is connected with negative electrode and the described filter unit of described diode D5, another power interface of the tube lamp holder of the anode of described diode D5 and back-up source Frame lamp, the negative electrode of the other end of piezo-resistance Vz1 and described diode D7 connects respectively, the anode of described diode D7 is connected respectively with anode and the described filter unit of described diode D6.
7. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as described in claim 2-5 any one, it is characterized in that: described light modulation constant-current drive circuit comprises light modulation chip U1, metal-oxide-semiconductor Q1, transformer T1, voltage starting unit and RCD absorption circuit, the output of described mode of operation detection module is connected with the DIM pin of described light modulation chip U1 by a resistance R 18, the GATE pin of described light modulation chip U1 is connected with the G of described metal-oxide-semiconductor Q1 end, the D end of described metal-oxide-semiconductor Q1 is connected with the input of described transformer T1, the input of described voltage starting unit is connected with described filter unit, the output of described voltage starting unit is connected with the power input of described light modulation chip U1, the input of described transformer T1 is also connected to RCD absorption circuit, an output of described transformer T1 is connected with described LED light source module by a rectification circuit, another output of described transformer T1 is by the power input of another rectification circuit and described light modulation chip U1, the power input of described comparator U2B connects.
8. the LED lamp tube drive circuit that is applicable to back-up source Frame lamp as claimed in claim 7, it is characterized in that: described voltage starting unit comprises the resistance R 5 of mutual series connection, R6, described RCD absorption circuit comprises resistance R 3, R4, capacitor C 4 and diode D2, described resistance R 3 and capacitor C 4 are parallel with one another, and the one end after parallel connection and described resistance R 6, described transformer T1 connects, the other end after parallel connection is connected with one end of described resistance R 4, the other end of described resistance R 4 is connected with the negative electrode of described diode D2, the anode of described diode D2 is connected with described transformer T1.
CN201110339169.6A 2011-10-31 2011-10-31 LED (Light Emitting Diode) light tube driving circuit suitable for backup power supply fixture lamp Expired - Fee Related CN102510622B (en)

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CN103256509B (en) * 2013-05-22 2014-10-29 北京铨富光电科技有限公司 Sectional type LED dimming lamp without externally arranged dimmer and dimming method thereof
CN103313482A (en) * 2013-06-24 2013-09-18 杭州徕科光电有限公司 Light-emitting diode (LED) emergency lighting system and LED lighting lamp
CN105090862A (en) * 2015-09-19 2015-11-25 黄兆 Multifunctional emergency LED (Light Emitting Diode) bulb with back-up source
CN106686845B (en) * 2015-11-06 2019-05-17 海洋王(东莞)照明科技有限公司 Microwave induced light adjusting circuit and lamps and lanterns with contingency mode

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