CN102510622B - LED tube drive circuit suitable for back-up power bracket lights - Google Patents

Abstract

The invention discloses an LED lamp tube driving circuit suitable for a backup power supply bracket lamp, which 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 which are connected with each other, wherein the high-frequency rectifying and filtering module comprises a protection unit, a rectifying bridge unit and a filtering unit and is used for rectifying and filtering commercial power and a high-frequency pulse power inverted by a backup power supply, and the filtering unit comprises electrolytic capacitors CE1 and CE2, a differential mode inductor Ld2, a common mode inductor T2, capacitors C3A, C3 and a resistor R11. Compared with the prior art, the LED fluorescent lamp tube circuit has the advantages that the mains supply rectifying and filtering circuit in the existing LED fluorescent lamp tube circuit is changed into the high-frequency rectifying and filtering circuit, the non-dimming constant current drive is changed into the dimming constant current drive, and the working mode detection circuit is additionally arranged, so that when a stand lamp or a signboard and the like are powered by a backup power supply, the LED light source module can normally work in an emergency lighting mode, the service lives of the LED light source module and the stand lamp or the signboard are prolonged, and the LED fluorescent lamp tube circuit is energy-saving and environment-friendly.

Description

LED tube drive circuit suitable for back-up power bracket lights

technical field

The invention relates to the technical field of a backup power bracket lamp circuit, in particular to an LED lamp tube driving circuit suitable for a backup power bracket lamp.

Background technique

At present, in order to ensure personal safety, bracket lights or signboards are generally installed in corridors, emergency passages, and safe fire escapes of commercial buildings. The bracket lamp or signboard is an emergency lighting product with backup power supply mode.

The bracket light or signboard generally works in the state of permanent light, and is in two states of normal lighting and emergency lighting. When the mains power is used to supply power to the bracket lamp or the signboard, it is in the normal lighting mode; when the backup power supply is used to supply power to the bracket lamp or the signboard, it is in the emergency lighting mode. As shown in Fig. 1, the circuit of the existing bracket lamp or signboard includes two parts, the lamp bracket and the fluorescent tube 14, and the lamp bracket part includes the mains power failure detection and conversion, the battery charging module 10, the backup battery 13, the inductor The ballast 11, the starter 12, the backup battery 13, the magnetic ballast 11, the starter 12 and the fluorescent tube 14 are all connected to the module 10, and the mains input terminal is detected and converted by the mains power failure. . The battery charging module 10 is connected to the lamp holder. Since the bracket lamp uses a common fluorescent tube, the power consumption is large and the life of the lamp tube is short, which is not conducive to energy saving and environmental protection.

With the continuous development of science and technology, LED lamps are widely used due to their long life, low power consumption, and obvious energy-saving effects. As shown in Figure 2, it is a block diagram of applying LEDs to LED fluorescent tubes. As shown in the figure, the LED fluorescent tube is composed of a mains rectification and filtering circuit 20 , a non-dimming constant current drive circuit 21 , and an LED light source 22 . However, since the mains rectification and filtering circuit only considers low frequency (less than 1KHz) in the design, the loss is serious for high frequency power rectification and filtering, and it does not have dimming function and power supply voltage detection function. When the LED lamp tube is used for the back-up power bracket lamp, the mains power supply can be normally lit. After the mains power failure, because the power of the back-up power supply is small, it will go out or flicker and cannot work normally.

Therefore, it is necessary to provide an improved LED lamp drive circuit suitable for the backup power supply bracket lamp, so as to ensure that when the backup power supply is used to supply power to the product, the LED light source can normally work in the emergency lighting mode, and there will be no continuous Flickering, so as to achieve the purpose of power saving, environmental protection, and long service life.

Contents of the invention

The purpose of the present invention is to provide an LED lamp tube drive circuit suitable for back-up power supply bracket lights, so as to ensure that when the back-up power supply is used to supply power to the bracket lights or signs, etc., the LED light source module can normally work in the emergency lighting mode, thereby The service life of the LED light source module and the bracket lamp or the signboard is improved, and energy saving and environmental protection are achieved.

In order to achieve the above object, the present invention provides an LED lamp tube drive circuit suitable for back-up power supply bracket lamps, including a high-frequency rectification filter module, a working mode detection module, a dimming constant current drive module and an LED light source module. The frequency rectification and filtering module is used to rectify and filter the mains and the high-frequency pulse power supply inverted by the backup power supply. The high-frequency rectification and filtering module includes a protection unit, a bridge rectification unit and a filter unit. The input end of the protection unit is The power supply interface of the lamp head of the backup power bracket lamp, the output end of the protection unit is connected to the input end of the filter unit through the rectifier bridge unit, and the output end of the filter unit is connected to the input of the working mode detection module terminal and the power input terminal of the dimming constant current drive module are respectively connected, the output terminal of the working mode detection module is connected to the dimming constant current drive module, the output terminal of the dimming constant current drive module is connected to the The LED light source module is connected, wherein the filter unit includes electrolytic capacitors CE1, CE2, differential mode inductor Ld2, common mode inductor T2, capacitors C3A, C3 and resistor R11, the capacitor C3A is connected with the rectifier bridge unit and the common One end of the mode inductor T2 is connected, the other end of the common mode inductor T2 is connected to the electrolytic capacitor CE2, the electrolytic capacitor CE1 and the capacitor C3 are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected to the One end of the common mode inductor T2 and one end of the electrolytic capacitor CE2 are respectively connected, the differential mode inductor Ld2 is connected in parallel with the resistor R11, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected to the common mode inductor T2 and one end of the electrolytic capacitor CE2 respectively connect.

Compared with the prior art, because the LED lamp tube driving circuit applicable to the backup power bracket lamp of the present invention changes the mains rectification filter circuit in the existing LED fluorescent lamp tube circuit into a high-frequency rectification filter circuit, the non-dimming constant The current drive is changed to a dimming constant current drive, and a working mode detection circuit is added to ensure that the LED light source module can normally work in the emergency lighting mode when the backup power supply is used to supply power to the bracket lights or signboards, thereby improving all The LED light source module and the service life of the bracket lamp or the signboard are energy-saving and environmentally friendly.

Specifically, in a preferred embodiment of the present invention, the working mode detection module includes a voltage dividing unit, a reference voltage unit and a comparator, one end of the voltage dividing unit is connected to the output end of the high frequency rectification and filtering module 1. The input end of the dimming constant current drive module is connected, the other end of the voltage dividing unit is connected to the non-inverting input end of the comparator, and one end of the reference voltage unit is connected to the dimming constant current drive module. connected to one output terminal, the other terminal of the reference voltage unit is connected to the inverting input terminal of the comparator, and the output terminal of the comparator is connected to the dimming constant current driving module through a resistor R18.

Specifically, the voltage dividing unit includes resistors R13, R14, and R17 connected in series in sequence, and one end of the series connection is connected to the output end of the high-frequency rectification and filtering module and the power input end of the dimming constant current drive module. , the other end after being connected in series is connected to the ground end of the comparator, and the interconnected ends of the resistors R14 and R17 are both connected to the non-inverting input end of the comparator.

Specifically, the reference voltage unit includes a resistor R19, diodes D9, Dz1, and a capacitor C9. The resistor R19 and the diode D9 are connected in series, and one end of the series connection is connected to an output end of the dimming constant current drive module. The other end is connected to the inverting input terminal of the comparator, diode Dz1 and capacitor C9 respectively, the diode Dz1 and capacitor C9 are connected in parallel, and one end after parallel connection is connected to the inverting input terminal of the comparator, after parallel connection The other end is connected to the ground end of the comparator.

In another preferred embodiment of the present invention, the working mode detection module includes resistors R13, R14, R17 and a diode Dz1, the resistors R13, R14 are connected in series, and one end of the series connection is connected to the high-frequency rectification and filtering module The output terminal of the dimming constant current drive module is connected to the power supply input terminal, and the other end connected in series is connected to the resistor R17 and the diode Dz1, the resistor R17 and the diode Dz1 are connected in parallel, and one end connected in parallel is connected to the The dimming constant current drive module and the resistor R14 are connected, and the other end of the parallel connection is grounded.

Specifically, the protection unit includes a fuse F1 and a piezoresistor Vz1, one end of the fuse F1 is connected to a power interface of the lamp cap of the backup power bracket lamp, and the other end of the fuse F1 is connected to the piezoresistor Vz1 and the rectifier bridge unit are respectively connected, one end of the piezoresistor Vz1 is another power interface of the lamp cap of the backup power bracket lamp, and the other end of the piezoresistor Vz1 is connected with the rectifier bridge unit.

Specifically, the rectifier bridge unit includes diodes D4, D5, D6 and D7, the anode of the diode D4 is respectively connected to the fuse F1, one end of the varistor Vz1 and the cathode of the diode D6, and the cathode of the diode D4 It is connected with the cathode of the diode D5 and the filter unit, and the anode of the diode D5 is connected with another power interface of the lamp cap of the backup power bracket lamp, the other end of the piezoresistor Vz1, and the other end of the diode D7. The cathodes are respectively connected, and the anode of the diode D7 is connected to the anode of the diode D6 and the filter unit respectively.

Specifically, the dimming constant current driving circuit includes a dimming chip U1, a MOS transistor Q1, a transformer T1, a voltage starting unit, and an RCD absorption circuit. The output terminal of the working mode detection module communicates with the dimming The DIM pin of the chip U1 is connected, the GATE pin of the dimming chip U1 is connected to the G terminal of the MOS transistor Q1, the D terminal of the MOS transistor Q1 is connected to the input terminal of the transformer T1, and the voltage starting unit The input end of the voltage starting unit is connected to the filter unit, the output end of the voltage starting unit is connected to the power input end of the dimming chip U1, the input end of the transformer T1 is connected with an RCD absorption circuit, and the input end of the transformer T1 One output end is connected to the LED light source module through a rectification circuit, and the other output end of the transformer T1 is connected to the power input end of the dimming chip U1 and the power input end of the comparator U2B through another rectification circuit. connect.

Specifically, the voltage starting unit includes resistors R5 and R6 connected in series, and the RCD absorption circuit includes resistors R3, R4, capacitor C4, and diode D2. The resistor R3 and capacitor C4 are connected in parallel, and one end of the parallel connection is connected to The resistor R6 is connected to the transformer T1, the other end of the parallel connection is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the Transformer T1 is connected.

The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

Description of drawings

Fig. 1 is a structural block diagram of an existing backup power supply bracket lamp.

Fig. 2 is a block diagram of the working principle of the existing LED lamp tube.

Fig. 3 is a block diagram of an embodiment of an LED lamp tube driving circuit suitable for a backup power bracket lamp according to the present invention.

FIG. 4 is a circuit diagram of FIG. 3 .

Fig. 5 is a block diagram of another embodiment of the LED lamp tube driving circuit applicable to the backup power stand lamp of the present invention.

FIG. 6 is a circuit diagram of FIG. 5 .

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements. As mentioned above, the present invention provides a kind of LED tube driving circuit suitable for back-up power bracket lights, because the LED tube driving circuit suitable for back-up power bracket lights can rectify the commercial power in the existing LED fluorescent tube circuit The filter circuit is changed to a high-frequency rectification filter circuit, the non-dimming constant current drive is changed to a dimming constant current drive, and the working mode detection circuit is added to ensure that when the backup power supply is used to supply power to the bracket lights or signs, etc., The LED light source module can normally work in the emergency lighting mode, thereby improving the service life of the LED light source module and the bracket lamp or signboard, and is energy-saving and environmentally friendly.

Please refer to Fig. 3 and Fig. 4, an embodiment of the LED lamp tube driving circuit applicable to the backup power bracket lamp of the present invention includes a high-frequency rectification and filtering module 30, a working mode detection module 32, a dimming constant current driving module 34 and an LED A light source module 36, the input end of the high-frequency rectification filter module 30 is connected to the lamp head of the lamp, the output end of the high-frequency rectification filter module 30 is connected to the input end of the working module detection module 32, the dimming constant current The input ends of the driving module 34 are respectively connected, the output end of the working mode detection module 32 is connected to an output end of the dimming constant current driving module 34, and the other output end of the dimming constant current driving module 34 is connected to the The LED light source module 36 is connected.

Among them, the high-frequency rectification and filtering module 30 is used to rectify and filter the mains (220V, 50Hz) and the high-frequency (greater than 10KHz) pulse power inverted by the backup power supply to make it a smooth DC high-voltage power supply as a working The voltage is provided to the working module detection module 32 and the dimming constant current drive module 34, and the working mode detection module 32 is used to identify the external power supply voltage to detect whether the power supply of the entire product in the current state is mains or standby power supply, and output control signals to control the dimming constant current driving module 34 to work in normal lighting or emergency lighting mode, the dimming constant current driving module 34 is used to provide working power to the LED light source module 36 .

Wherein, the working mode detection module 32 includes a voltage dividing unit 321, a reference voltage unit 322 and a comparator U2B, one end of the voltage dividing unit 321 is connected to the output end of the high frequency rectification and filtering module 30, the dimming The input end of the constant current drive module 34 is connected, the other end of the voltage dividing unit 321 is connected to the non-inverting input end (pin 5) of the comparator U2B, and one end of the reference voltage unit 322 is connected to the dimming constant current One output end of the drive module 34 is connected, the other end of the reference voltage unit 322 is connected to the inverting input end (pin 6) of the comparator U2B, and the power input end (pin 8) of the comparator U2B is connected to the An output terminal of the dimming constant current driving module 34 is connected, and the output terminal (pin 7) of the comparator U2B is connected to the dimming constant current driving module 34 through a resistor R18. Wherein, the reference voltage unit 322 is used to provide a reference voltage source to the comparator U2B, and the voltage divider unit 321 is used to divide the power supply voltage from the high-frequency rectification and filtering module 30 and provide it to the comparator device U2B to compare it with the reference voltage source.

Specifically, the voltage dividing unit 321 includes resistors R13, R14, and R17 connected in series in sequence, and one end connected in series is connected to the output end of the high frequency rectification filter module 30 and the input end of the dimming constant current drive module 34. The terminals are connected respectively, and the other end connected in series is connected with the ground terminal (pin 4) of the comparator U2B, and the terminals connected to each other of the resistors R14 and R17 are connected with the non-inverting input terminal (pin 5) of the comparator U2B .

Specifically, the reference voltage unit 322 includes a resistor R19, diodes D9, Dz1, and a capacitor C9, the resistor R19 and the diode D9 are connected in series, and one end of the series connection is connected to an output end of the dimming constant current driving module 34, The other end of the series connection is connected with the inverting input end (pin 6) of the comparator U2B, the diode Dz1 and the capacitor C9 respectively, the diode Dz1 and the capacitor C9 are connected in parallel, and one end of the parallel connection is connected with the comparator U2B. The inverting input terminal (pin 6) is connected, and the other terminal connected in parallel is connected to the ground terminal (pin 4) of the comparator U2B.

Specifically, the high-frequency rectification and filtering module 30 includes a protection unit 301, a rectifier bridge unit 302, and a filter unit 303. The input end of the protection unit 201 is the power interface of the lamp head of the backup power bracket lamp. The protection unit The output terminal of 301 is connected to the input terminal of the filter unit 303 through the rectifier bridge unit 302, and the output terminal of the filter unit 303 is connected to the resistor R13 of the voltage dividing unit 321 and the dimming constant current drive module 34 The input terminals VHD are connected separately.

Specifically, the protection unit 301 includes a fuse F1 and a piezoresistor Vz1, one end of the fuse F1 is connected to a power interface (A, B end) of the lamp cap of the backup power bracket lamp, and the other end of the fuse F1 One end is respectively connected to the varistor Vz1 and the rectifier bridge unit 302, and one end of the varistor Vz1 is connected to the other power interface (C, D end) of the lamp cap of the backup power bracket lamp. The other end of the varistor Vz1 is connected to the rectifier bridge unit 302 .

Specifically, the rectifier bridge unit 302 includes diodes D4, D5, D6 and D7, the anode of the diode D4 is respectively connected to the fuse F1, one end of the varistor Vz1 and the cathode of the diode D6, and the anode of the diode D4 The cathode is connected to the cathode of the diode D5 and the filtering unit 303, the anode of the diode D5 is connected to the other power interface (C, D terminals) of the lamp cap of the backup power bracket lamp, the connection of the piezoresistor Vz1 The other end is connected to the cathode of the diode D7 respectively, and the anode of the diode D7 is connected to the anode of the diode D6 and the filtering unit 303 respectively.

Specifically, the filter unit 303 includes electrolytic capacitors CE1, CE2, differential mode inductor Ld2, common mode inductor T2, capacitors C3A, C3 and resistor R11, the capacitor C3A is connected to one end of the common mode inductor T2, and the One end of the capacitor C3A is connected to the cathodes of the diodes D4 and D5, the other end of the capacitor C3A is connected to the anodes of the diodes D6 and D7, and the other end of the common mode inductor T2 is connected to the electrolytic capacitor CE2 , the electrolytic capacitor CE1 and the capacitor C3 are connected in parallel with each other, and one end of the parallel connection is grounded, and the other end of the parallel connection is respectively connected with the common mode inductor T2 and one end of the electrolytic capacitor CE2, and the differential mode inductor Ld2 is connected in parallel with the resistor R11 , and one end of the parallel connection is grounded, and the other end of the parallel connection is respectively connected to one end of the common mode inductor T2 and the electrolytic capacitor CE2.

Specifically, the dimming constant current drive circuit 34 includes a dimming chip U1, a MOS transistor Q1, a transformer T1, a voltage starting unit 341, and an RCD absorption circuit 342. The output terminal (pin 7) of the comparator U2B passes through a resistor R18 is connected to the DIM pin of the dimming chip U1, the DIM pin is grounded through a capacitor C8, and the GATE pin of the dimming chip U1 is connected to the MOS through a rectifier bridge circuit composed of a parallel connection of a resistor R10 and a diode D8. The G terminal of the tube Q1 is connected, an output terminal of the MOS tube Q1 is connected to the CS pin of the dimming chip U1, and is grounded through the parallel resistors R15 and R16, and the D terminal of the MOS tube Q1 is connected to the The input end of the transformer T1 (winding pin 2) is connected, the input end of the voltage starting unit 241 is connected to the output end of the filter unit 303, the output end of the voltage starting unit 341 is connected to the power supply of the dimming chip U1 The input end is connected to the input end of the transformer T1 and is connected with an RCD absorption circuit, an output end (winding Ns1 end) of the transformer T1 is connected to the LED light source module 36 through a rectifier circuit 1, and the other end of the transformer T1 An output terminal (winding 3, pin 4) is connected to the power input terminal (VCC terminal) of the dimming chip U1 and the power input terminal (pin 8) of the comparator U2B through another rectification circuit 2 . The induced voltage generated by the winding 3 and pin 4 of the transformer T1 is used to provide the working voltage of the comparator U2B and the dimming chip U1.

Wherein, the rectifier circuit 1 includes capacitors C1, C2, resistors R1A, R1, R2, diodes D1, D1A, and an electrolytic capacitor C5, the resistors R1A, R1 are connected in parallel, and one end of the parallel connection is connected to the capacitor C1. One end of the winding Ns1 end of the transformer T1 is connected, and the other end after parallel connection is connected with the other end of the winding Ns1 end of the transformer T1 through the electrolytic capacitor C5. The diodes D1 and D1A are connected in parallel with each other, and one end after parallel connection is connected with the The capacitor C1 is connected, and the other end of the parallel connection is connected with the capacitor C2, the resistor R2 and the LED light source module 36, the capacitor C2 and the resistor R2 are connected in parallel, and one end of the parallel connection is connected with one end of the diodes D1 and D1A in parallel The other end after parallel connection is connected with the other end of the winding Ns1 end of the transformer T1 and the LED light source module 36 .

The rectifier circuit 2 includes a resistor R7 and a diode D3 connected in series, one end of the resistor R7 is connected to the resistor R19 of the reference voltage unit 322, and grounded through a resistor R8 and capacitors C7 and R12 connected in series, the One end of the diode D3 is connected to the power input terminal (pin 8) of the comparator U2B and the power input terminal (VCC terminal) of the dimming chip U1, and is grounded through a capacitor C6.

Specifically, the voltage starting unit 341 includes resistors R5 and R6 connected in series, and the RCD absorbing loop 342 includes resistors R3, R4, capacitor C4, and diode D2. The resistor R3 and capacitor C4 are connected in parallel, and the parallel connection One end is connected to the resistor R6 and the transformer T1 (winding 1 pin), the other end connected in parallel is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the cathode of the diode D2, the The anode of the diode D2 is connected with the transformer T1 (winding 2 pin). The voltage starting unit 341 is used to provide a starting voltage for the dimming driver chip U1 to start working, and the RCD absorbing circuit 342 is used to absorb the high voltage of the transformer T1.

Preferably, since the LED light source has the advantages of obvious energy saving and long life, the LED light source module 36 uses LED as the light source, which saves more energy and improves the overall product quality compared with the traditional LED light source module 36 using other light sources. service life.

The working principle of the LED lamp tube drive circuit applicable to the backup power bracket lamp of the present invention is as follows: when the LED lamp tube drive circuit suitable for the backup power bracket lamp starts to work, the high-frequency pulse of the mains or the backup power inverter After the power supply is rectified and filtered by the high-frequency rectification and filtering module 30, a smooth DC high voltage is output, and the DC high voltage is divided by the voltage dividing unit 321 and then input to the non-inverting input terminal (pin 5) of the comparator U2B. The comparator U2B compares the reference voltage from the reference voltage unit 322 with the voltage from the voltage dividing unit 321, and outputs a control signal to control the dimming constant current drive module 34 to work in normal lighting or emergency lighting mode, the dimming constant current drive module 34 is used to provide working power to the LED light source module 36 . When the power supply is commercial power (220V, 50Hz AC power supply), the rectified and filtered DC voltage is greater than 250V, at this time the comparator U2B outputs a high-level signal to control the dimming constant current drive module 34 to work Perform normal lighting at 100% brightness, so as to provide the LED light source module 36 with working current for normal lighting; Mains supply power, the rectified and filtered DC voltage is less than 250V. At this time, the comparator U2B outputs a low voltage signal to control the dimming constant current drive module 34 to work at about 20% brightness for emergency lighting, thereby providing The LED light source module 36 provides working current for emergency lighting.

Please refer to Fig. 5 and Fig. 6, which are another embodiment of the LED lamp tube driving circuit applicable to the backup power bracket lamp of the present invention. This will not be repeated here. The difference between it and the above-mentioned embodiment is that the working mode detection module 32 includes resistors R13, R14, R17 and a diode Dz1, the resistors R13 and R14 are connected in series, and one end of the series connection is connected to the high-frequency rectification and filtering module 30 The output terminal of the dimming constant current drive module 34 is connected to the power supply input terminal, and the other terminal connected in series is connected to the resistor R17 and the diode Dz1, the resistor R17 and the diode Dz1 are connected in parallel, and one terminal connected in parallel is connected to the The dimming constant current driving module 34 is connected to the resistor R14, and the other end of the parallel connection is grounded. In this embodiment, the working mode detection module 32 is for the output voltage of the high-frequency rectification and filtering module 30 to be dimmed to the dimming constant current driving module 34 through simple voltage division, and this example is also applicable to those with backup power supply Bracket lights.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations made according to the essence of the present invention.

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.

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