CN205137161U - Constant current drive's LED fluorescent tube - Google Patents
Constant current drive's LED fluorescent tube Download PDFInfo
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- CN205137161U CN205137161U CN201520844798.8U CN201520844798U CN205137161U CN 205137161 U CN205137161 U CN 205137161U CN 201520844798 U CN201520844798 U CN 201520844798U CN 205137161 U CN205137161 U CN 205137161U
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Abstract
The utility model relates to a constant current drive's LED fluorescent tube, it includes lamp stand, insulating pipe box, LED light source module, radiator and drive plate. The both sides at insulating pipe box are fixed to the lamp stand to an airtight space has been injectd. LED light source module, radiator and drive plate set up in airtight space. Be provided with the LED constant current drive device on the drive plate, the LED constant current drive device includes rectifier module, power module, constant -current module, energy storage unit and lighting module. Power module and lighting module are connected respectively to rectifier module's output. Energy storage unit connection lighting module and constant -current module, constant -current module sets up between power module and lighting module. Constant -current module comprises the control unit, switch module, compensating circuit and sampling circuit. Sampling circuit includes a plurality of sampling resistor, and the switch module includes a plurality of switch element, and every switch element includes a transistor respectively.
Description
Technical field
The utility model relates to a kind of LED fluorescent lamp tube, particularly relates to the LED fluorescent lamp tube that a kind of constant current drives.
Background technology
Present country advocates energy-saving and emission-reduction, and the illuminating product of the LED light source adopted at lighting field develops rapidly with its excellent energy-conservation, low-carbon (LC) and environmental protection effect.When LED is as light source of illumination device, the life-span of lighting device not only depends on LED, also depends on the assemblies such as driving power.In current application scheme, the bottleneck in LED light device life-span remains driving power.In order to reduce the driving power life-span to LED lamp aging effects, researcher improves existing dc source drive unit on the one hand, designs the circuit of the direct driving LED of brand-new alternating current on the other hand.
For ordinary people, the scope of application of LED daylight lamp is comparatively wide, but existing LED illumination product Problems existing drives the life-span short.The drive scheme adopted on the market because existing is traditional switch power technology, this technology relative maturity, but the volume of power supply is comparatively large, needs good heat dispersion.When this power technology is incorporated into LED daylight lamp, it is supplied to the narrow space of driving power, operating ambient temperature higher (higher than 60 DEG C), so directly cause driving service life reduction, the cost of Simultaneous Switching power supply is high, and EMC characteristic difference (needing additional auxiliary element).And existing LED daylight lamp is once damage, the value of substantially not keeping in repair, needs directly to change driving power, but owing to being subject to the restriction of LED daylight lamp power supply cavity, the driving power of generally can only change and specify producer, specifying model, and maintenance process is complicated.
Also have some to exchange direct driving LED circuit at present, its method adopted is traditional resistance-capacitance depressurization or adopts single channel linear constant current technology.Although resistance-capacitance depressurization technology cost is low, there is following problem in these technology, and the power factor of LED circuit is lower (being generally 0.2 ~ 0.5).And need to adopt high-voltage capacitance, the volume of this electric capacity is large, the life-span, also just all can be breakdown once capacitance damage LED well below LED, directly causes whole light fixture to be scrapped.In addition, although adopt single channel linear constant current technology to solve the problem (generally 0.8 ~ 0.85) on the low side of power factor, but in the one-period of electric main work, because circuit needs a starting resistor, and this starting resistor is general higher, thus has circuit to be for a long time in off position (utilization rate is lower than 60%).All there is the defect that light output has larger stroboscopic in these circuit.
Such as, Chinese patent CN201020205220.5 discloses a kind of LED daylight lamp, and it comprises LED body and connection-peg, and described LED body comprises base, drive plate and lampshade.This LED daylight lamp is without radiator, and radiating effect is not good, can affect the working life of LED.And the circuit structure on drive plate is complicated, and cost is higher.
Utility model content
For the deficiency of prior art, the utility model provides the LED fluorescent lamp tube that a kind of constant current drives, and it comprises lamp socket, insulative pipe sleeve, LED light source module, radiator and drive plate, it is characterized in that,
Described lamp socket is fixed on the both sides of described insulative pipe sleeve, thus defines a confined space, and described LED light source module, described radiator and described drive plate are arranged in described confined space,
Described drive plate is provided with LED constant current drive unit, described LED constant current drive unit comprises rectification module, supply module, constant flow module, energy-storage units and lighting module, and described lighting module comprises several LED unit,
The output of described rectification module connects described supply module and described lighting module respectively, and described energy-storage units connects described lighting module and described constant flow module, and described constant flow module is arranged between described supply module and described lighting module,
Described constant flow module is made up of control unit, switch module, compensating circuit and sample circuit, and described sample circuit comprises several sampling resistors, and described switch module comprises several switch elements, and each switch element comprises a transistor respectively,
In each switch element, the drain electrode of its transistor is connected to output and the compensating circuit of corresponding LED unit, the grid of its transistor connects described control unit, and the source electrode of its transistor is connected to the source electrode of the transistor of next switch element via the sampling resistor of correspondence.
According to a preferred embodiment, described rectification module comprises the first rectifier arm and the second rectifier arm that are made up of four diodes, the first diode in described four diodes and the second Diode series form described first rectifier arm, the 3rd diode in described four diodes and the 4th Diode series form described second rectifier arm, and described diode is commutation diode or Schottky diode.
According to a preferred embodiment, described supply module comprises the first power supply branch road and the second power supply branch road, described first power supply branch road and described second power supply branch circuit parallel connection are between the output plus terminal and output negative terminal of described rectification module, first power supply branch road comprises the first current-limiting resistance and the first voltage-stabiliser tube, wherein, the negative terminal of described first voltage-stabiliser tube connects the in-phase end of the operational amplifier of described first current-limiting resistance and described control unit; Described second power supply branch road comprises the second current-limiting resistance and the second voltage-stabiliser tube, the negative terminal of described second voltage-stabiliser tube connects the feeder ear of described second current-limiting resistance and described operational amplifier, described second current-limiting resistance and described first current-limiting resistance are connected to the output plus terminal of described rectification module jointly, and the anode of described second voltage-stabiliser tube and the anode of described first voltage-stabiliser tube are connected to the output negative terminal of described rectification module jointly.
According to a preferred embodiment, described supply module also comprises the first filter capacitor and the second filter capacitor, wherein, the negative terminal of described first voltage-stabiliser tube and one end of described first filter capacitor are connected to the in-phase end of described operational amplifier jointly, the negative terminal of described second voltage-stabiliser tube and one end of described second filter capacitor are connected to the feeder ear of described operational amplifier jointly, and the other end of the other end of described first filter capacitor and described second filter capacitor is connected to the output negative terminal of described rectification module jointly.
According to a preferred embodiment, described compensating circuit comprises several resistance, wherein, one end of each resistance is connected to the end of oppisite phase of described operational amplifier jointly, the other end of feedback resistance connects source electrode and first sampling resistor of the first transistor, the other end of the first resistance is connected to the drain electrode of described the first transistor, the other end of the second resistance is connected to the drain electrode of transistor seconds, the other end of the 3rd resistance is connected to the drain electrode of third transistor, and the other end of the 4th resistance is connected to the drain electrode of the 4th transistor.
According to a preferred embodiment, described transistor is N-MOSFET or NPN type triode, the drain electrode of described the first transistor is connected to the drain electrode of described transistor seconds via the first sampling resistor, the drain electrode of described transistor seconds is connected to the drain electrode of described third transistor via the second sampling resistor, the drain electrode of described third transistor is connected to the drain electrode of described 4th transistor via the 3rd sampling resistor, the drain electrode of described 4th transistor is via the 4th sampling resistor ground connection, and the grid of described transistor is all connected to the output of described operational amplifier.
According to a preferred embodiment, described energy-storage units is made up of a storage capacitor, and one end of described storage capacitor connects the output of the first LED unit, and its other end connects the output of the 4th LED unit.
According to a preferred embodiment, described drive plate and described LED light source module have electrical connection, and the alternating current input of described drive plate is drawn by wire, and described LED light source module is single low-voltage light source or the high-voltage LED module adopting COB encapsulation.
According to a preferred embodiment, described radiator is arranged at the below of described LED light source module and contacts with it, described radiator is strip, its length is more than or equal to the length of described LED light source module, and described radiator becomes described LED light source module coated by described radiator half with the cross section of described LED light source module; The arranged outside of described lamp socket has electrode contact pin, and described drive plate accesses described electrode contact pin by wire.
According to a preferred embodiment, described first LED unit is arranged in middle two rows, and the second LED unit, the 3rd LED unit and described 4th LED unit are arranged from inside to outside successively.
The beneficial effects of the utility model are:
LED fluorescent lamp tube takes full advantage of the space of lamp socket and insulative pipe sleeve, and volume is little, is convenient to install and use.Constant current driver circuit for LED can adjust the onunit number of LED with voltage change, have higher power factor.Have employed the energy-storage units be made up of electric capacity, greatly reduce the stroboscopic degree of depth of light output.Do not adopt electrochemical capacitor and inductance in drive circuit, make LED daylight lamp have permanent service life and good EMC characteristic.
Accompanying drawing explanation
Fig. 1 is LED fluorescent lamp tube structural representation of the present utility model;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the electrical block diagram of LED drive device;
Fig. 4 is the basic circuit schematic diagram of LED drive device;
Fig. 5 is the oscillogram of input ac voltage in the utility model;
Fig. 6 is by the voltage oscillogram after rectification module in the utility model;
Fig. 7 is the voltage oscillogram in the utility model after input current and rectification; With
Fig. 8 is distribution of light sources figure of the present utility model.
Reference numerals list
3: lamp socket 4: insulative pipe sleeve 5:LED light source module
7: radiator 8: drive plate 9: electrode contact pin
Detailed description of the invention
Be described in detail below in conjunction with accompanying drawing.As shown in Figure 1, the LED fluorescent lamp tube that constant current of the present utility model drives comprises lamp socket 3, insulative pipe sleeve 4, LED light source module 5 and radiator 7.Both sides lamp socket 3 being fixed on insulative pipe sleeve 4 make it inner and form confined space, and LED light source module 5 is placed in the confined space of insulative pipe sleeve 4 inside, and LED light source module 5 also accesses drive plate 8, is drawn by the alternating current input of drive plate 8 by wire.Drive plate 8 is provided with LED constant current drive unit, drive plate 8 and LED light source module 5 are electrically connected.LED light source module 5 can be made up of single low-voltage light source, also can be the high-voltage LED module adopting COB encapsulation.As shown in Figure 2, above-mentioned radiator 7 can be set to strip section shape.Above-mentioned LED driving control device can be arranged on the below of radiator 7 by the radiator 7 of this kind of shape, and is placed in the confined space of insulative pipe sleeve 4 inside.
The arranged outside of lamp socket 3 has electrode contact pin 9, and drive plate 8 accesses this electrode contact pin 9 by wire.And above-mentioned radiator 7 is also arranged in the confined space of insulative pipe sleeve 4 inside, and the below being placed in LED light source module 5 contacts with it.The length of radiator 7 is more than or equal to the length of LED light source module 5 simultaneously, and LED light source module 5 is coated by radiator 7 half on cross section.Alternating current is linked into inner LED constant current drive unit by electrode contact pin 9.
As shown in Figure 3, LED constant current drive unit comprises rectification module 10, supply module 30, constant flow module, energy-storage units 70 and lighting module 40.Lighting module 40 comprises several LED unit.The output of rectification module 10 connects supply module 30 and lighting module 40 respectively.Energy-storage units 70 connects lighting module 40 and constant flow module, and constant flow module is arranged between supply module 30 and lighting module 40.Constant flow module is made up of control unit 50, switch module 60, compensating circuit 21 and sample circuit 20.Sample circuit 20 comprises several sampling resistors, and switch module 60 comprises several switch elements, and each switch element comprises a transistor respectively.In each switch element, the drain electrode of transistor is connected to output and the compensating circuit 21 of corresponding LED unit, the grid connection control unit 50 of transistor, the source electrode of transistor is connected to the source electrode of the transistor of next switch element via the sampling resistor of correspondence.
The LED fluorescent lamp tube that constant current of the present utility model drives takes full advantage of the space of lamp socket and insulative pipe sleeve, makes whole device volume little, is convenient to install and use.Working method due to circuit is the onunit number adjusting LED with voltage change, make the curent change driven close to voltage change, the benefit that this circuit directly brings has higher power factor (being not less than 0.95), and can put forward again high-tension utilization rate (being greater than 90%).
As shown in Figure 4, rectification module 10 comprises 4 commutation diodes 101,102,103,104.Supply module 30 is made up of the first power supply branch road and the second power supply branch road.First power supply branch road and the second power supply branch circuit parallel connection are between the output plus terminal and output negative terminal of rectification module 10.First power supply branch road comprises the first current-limiting resistance 201 and the first voltage-stabiliser tube 301.The negative terminal of the first voltage-stabiliser tube 301 connects the in-phase end of the first current-limiting resistance 201 and operational amplifier 501.
Second power supply branch road comprises the second current-limiting resistance 202 and the second voltage-stabiliser tube 302.The negative terminal of the second voltage-stabiliser tube 302 connects the feeder ear VCC of the second current-limiting resistance 202 and operational amplifier 501.Second current-limiting resistance 202 and the first current-limiting resistance 201 are connected to the output plus terminal of rectification module 10 jointly.The anode of the second voltage-stabiliser tube 302 and the anode of the first voltage-stabiliser tube 301 are connected to the output negative terminal of rectification module 10 jointly.Aforementioned supply module 30 can also comprise the first filter capacitor 304 and the second filter capacitor 303.The negative terminal of the first voltage-stabiliser tube 301 and one end of the first filter capacitor 304 are connected to the in-phase end of operational amplifier 501 jointly, and the negative terminal of the second voltage-stabiliser tube 302 and one end of the second filter capacitor 303 are connected to the feeder ear VCC of operational amplifier 501 jointly.The other end of the first filter capacitor 304 and the other end of the second filter capacitor 303 are connected to the output negative terminal of rectification module 10 jointly.Control unit 50 comprises an operational amplifier 501, the output of operational amplifier 501 is connected to the grid of each transistor 601,602,603,604 respectively, and the end of oppisite phase of operational amplifier 501 is connected to one end of resistance 207,208,209,210,211 respectively.
Compensating circuit 21 is made up of 5 resistance 207,208,209,210,211.Sample circuit 20 is made up of 4 sampling resistors 203,204,205,206.Switch module 60 is made up of 4 transistors 601,602,603,604.Lighting module 40 is made up of 4 LED unit 401,402,403,404, and the LED quantity of each LED unit, for being not less than one, adopts series system to connect.Diode 101,102,103,104 can be common commutation diode, also can be withstand voltage enough Schottky diodes or other components and parts that can realize identical function.Transistor 601,602,603,604 can be N-MOSFET, also can be NPN triode.
The first input end IN1 of rectification module 10 is connected on the connected node of the first diode 101 anode and the second diode 102 negative terminal.The anode of the second diode 102 is connected with the anode of the 4th diode 104, and its connected node constitutes the output negative terminal of rectification module 10.Second input IN2 of rectification module 10 is connected on the anode of the 3rd diode 103 and the connected node of the 4th diode 104 negative terminal.The negative terminal of the 3rd diode 103 connects the negative terminal of the first diode 101, and its connected node constitutes the output plus terminal of rectification module 10.
The input of LED unit 401 connects the output plus terminal of rectification module 10, and the output of LED unit 401 connects the input of LED unit 402.The drain electrode of the first transistor 601 is connected to the output of LED unit 401 and the other end of the first resistance 207.The source electrode of the first transistor 601 connects the other end of feedback resistance 211, and the source electrode of the first transistor 601 is also connected to the source electrode of transistor seconds 602 via the first sampling resistor 203.The drain electrode of transistor seconds 602 is connected to the output of LED unit 402 and the other end of the second resistance 208, and the source electrode of transistor seconds 602 is connected to the source electrode of third transistor 603 via the second sampling resistor 204.The drain electrode of third transistor 603 is connected to the output of LED unit 403 and the other end of the 3rd resistance 209, and the source electrode of third transistor 603 is connected to the source electrode of the 4th transistor 604 via the 3rd sampling resistor 205.The drain electrode of the 4th transistor 604 is connected to the output of LED unit 404 and the other end of the 4th resistance 210, and the source electrode of the 4th transistor 604 is via the 4th sampling resistor 206 ground connection.One end of electric capacity 701 is connected with the output of the first LED unit 401, and the other end of electric capacity 701 is connected with the output of the 4th LED unit 404.
The specific works principle of LED constant current drive unit is as follows:
Be illustrated in figure 5 the voltage oscillogram of electric main.Electric main output ripple direct current after the bridge rectifier that commutation diode 101,102,103,104 forms.The voltage oscillogram of Rectified alternating current as shown in Figure 6.Rectified alternating current, by after the second current-limiting resistance 202, second voltage-stabiliser tube 302 and the second filter capacitor 303, obtains a stable voltage for providing the operating voltage needed for operational amplifier 501 at the negative terminal of the second voltage-stabiliser tube 302.Rectified alternating current is by after the first current-limiting resistance 201, first voltage-stabiliser tube 301 and the first filter capacitor 304, obtain a stable reference voltage at the negative terminal of the first voltage-stabiliser tube 301, this reference voltage is for providing the reference voltage of operational amplifier 501 in-phase end.Resistance 207,208,209,210 and feedback resistance 211 constitute a power compensating circuit.
When the voltage increases, the voltage that feedback resistance 211 divides will raise, and the output end voltage of operational amplifier 501 is reduced.Thus the conducting resistance of the first transistor 601 is increased, input current reduces, and like this according to power=voltage × electric current, power can remain unchanged.Sampling resistor 203,204,205,206 is a sample circuit 20 in series mutually.Sampling resistor 203,204,205,206 is for setting the electric current flowing through LED unit.The forward conduction voltage of LED unit 401,402,403,404 is VF1, VF2, VF3, VF4.
When pulsating dc voltage rises to VF1 by 0V, the resistance value of the end of oppisite phase of operational amplifier 501 is the resistance after sampling resistor 203,204,205,206,211 is connected.Because the in-phase end voltage of now operational amplifier 501 is greater than its end of oppisite phase voltage, operational amplifier 501 output end voltage is high voltage.Thus make the first transistor 601 be in conducting state, start luminous after LED unit 401 conducting.Electric current after LED unit 401 and the first transistor 601, then flows through sampling resistor 203,204,205,206, obtains a voltage V1 in one end of feedback resistance 211.Now in compensating circuit 21, resistance 207,211 is started working, after electric current flows through LED unit 401, then by flowing into sampling resistor 203,204,205,206 after resistance 207,211.Obtain a voltage Vf at feedback resistance 211 like this, and this voltage raises with the rising of the voltage of input, thus obtain a voltage V-=V1+Vf at the end of oppisite phase of operational amplifier 501.Due to the voltage that voltage Vf is a dynamic change, therefore voltage V-is also a dynamic change voltage.Thus have adjusted the grid voltage of the first transistor 601, make the first transistor 601 be operated in amplification region, achieve current limliting.When finally achieving voltage rising, electric current declines, and power remains unchanged.
When voltage rises to VF1+VF2 from VF1, the resistance value of the end of oppisite phase of operational amplifier 501 is the resistance after sampling resistor 203,204,205,206,211 is connected.Because the in-phase end voltage of now operational amplifier 501 is greater than end of oppisite phase voltage, operational amplifier output terminal voltage is high voltage.Thus transistor 601,602 is in conducting state, start luminous after the conducting of such LED unit 401,402.When electric current is after LED unit 401,402 and transistor 602, then flow through series resistance 204,205,206, obtain a voltage V2 in one end of resistance 204.Now, because transistor 601 is also be in conducting state, so electric current is after LED unit 401 and transistor 601, then flow through series resistance 203,204,205,206, obtain a voltage V1 at the first end of resistance 203.
Meanwhile, in compensating circuit 21, resistance 207,208,211 is also started working, after electric current flows through LED unit 401,402, then by flowing into resistance 211,203,204,205,206 after resistance 207,208.Also a voltage Vf is just obtained like this at resistance 211, and this voltage Vf raises with the rising of the voltage of input, finally obtain a voltage V-=Vf+V1 at the end of oppisite phase of operational amplifier 501, and V->V1>V2.Present transistor 601,602 grid voltage is identical, but owing to having a resistance 203 between the source electrode of transistor 601,602, makes the conducting resistance of transistor 601 be greater than the conducting resistance of transistor 602.Thus making the electric current flowing through transistor 601 be less than the electric current flowing through transistor 602, two-way electric current presents intersection variable condition, realizes the function of soft handover, in dimming process, there will not be flicker.Due to the voltage that voltage Vf is a dynamic change, therefore voltage V-is also a dynamic change voltage.Thus have adjusted the grid voltage of transistor 601,602, make transistor 601,602 be operated in amplification region, achieve current limliting.When finally achieving voltage rising, electric current declines, and power remains unchanged.
When voltage rises to VF1+VF2+VF3 from VF1+VF2, the resistance value of the end of oppisite phase of operational amplifier 501 is the resistance after resistance 203,204,205,206,211 is connected.Because the in-phase end voltage of now operational amplifier 501 is greater than end of oppisite phase voltage, operational amplifier output terminal voltage is high voltage.Thus make transistor 601,602,603 be in conducting state, start luminous after the conducting of such LED unit 401,402,403.When electric current is after LED unit 401,402,403 and transistor 603, then flow through series resistance 205,206, obtain a voltage V3 in one end of resistance 205.Now, because transistor 601,602 is also be in conducting state, so electric current is after LED unit 401 and transistor 601, then flow through series resistance 203,204,205,206, obtain a voltage V1 in one end of resistance 203.Electric current, after LED unit 402 and transistor 602, after flowing through series resistance 204,205,206, obtains a voltage V2 in one end of resistance 204.
Meanwhile, in compensating circuit 21, resistance 207,208,209,211 is also started working, and electric current flows through LED unit 401,402,403, then by flowing into resistance 211,203,204,205,206 after resistance 207,208,209.Also just obtain a voltage Vf at resistance 211 like this, and voltage Vf raises with the rising of the voltage of input (reduce and reduce).Finally obtain a voltage V-=Vf+V1 at the end of oppisite phase of operational amplifier 501, and V->V1>V2>V3.Present transistor 601,602,603 grid voltage is identical, but owing to having a resistance 203 between the source electrode of transistor 601,602, has a resistance 204 between the source electrode of transistor 602,603.Thus make the conducting resistance of transistor 601 be greater than the conducting resistance of transistor 602, the conducting resistance of transistor 602 is greater than the conducting resistance of transistor 603, also just make the electric current flowing through transistor 601 be less than the electric current flowing through transistor 602, the electric current flowing through transistor 602 is less than the electric current flowing through transistor 603.Three road electric currents present intersection variable condition, realize the function of soft handover, in dimming process, there will not be flicker.Due to the voltage that voltage Vf is a dynamic change, therefore voltage V-is also a dynamic change voltage.Thus have adjusted the grid voltage of transistor 601,602,603, make transistor 601,602,603 be operated in amplification region, achieve current limliting.
When voltage rises to VF1+VF2+VF3+VF4 from VF1+VF2+VF3, the resistance value of the end of oppisite phase of operational amplifier 501 is the resistance after resistance 203,204,205,206,211 is connected.Now the in-phase end voltage of operational amplifier 501 is greater than end of oppisite phase voltage, and operational amplifier output terminal voltage is high voltage.Thus make transistor 601,602,603,604 be in conducting state, start luminous after the conducting of such LED unit 401,402,403,404.When electric current is through LED unit 401,402,403,404 and transistor 604, then after flowing through series resistance 206, obtain a voltage V4 in one end of resistance 206.Now, because transistor 601,602,603 is also be in conducting state, so electric current is through LED unit 401 and transistor 601, then after flowing through series resistance 203,204,205,206, obtain voltage V1 at the first end of resistance 203.Electric current through LED unit 402 and transistor 602, then after flowing through series resistance 204,205,206, obtains a voltage V2 at the first end of resistance 204.Electric current through LED unit 403 and transistor 603, then after flowing through series resistance 205,206, obtains a voltage V3 in one end of resistance 205.Meanwhile, in compensating circuit 21, resistance 207,208,209,210,211 is also started working, after electric current flows through LED unit 401,402,403,404, then by flowing into resistance 211,203,204,205,206 after resistance 207,208,209,210.Such resistance 211 also just obtains a voltage Vf, and this voltage Vf raises with the rising of the voltage of input (reduce and reduce).Finally obtain a voltage V-=Vf+V1 at the end of oppisite phase of operational amplifier 501, and V->V1>V2>V3Gre atT.GreaT.GTV4.
Present transistor 601,602,603,604 grid voltage is identical, because the conducting resistance of transistor 601,602,603,604 reduces successively, also just the electric current flowing through transistor 601 is made to be less than the electric current flowing through transistor 602, the electric current flowing through transistor 602 is less than the electric current flowing through transistor 603, and the electric current flowing through transistor 603 is less than the electric current flowing through transistor 604.Four road electric currents present intersection variable condition, also just realize the function of soft handover.Flicker is there will not be in dimming process.Due to the voltage that voltage Vf is a dynamic change, therefore voltage V-is also a dynamic change voltage; Thus have adjusted the grid voltage of transistor 601,602,603,604, make transistor 601,602,603,604 be operated in amplification region, achieve current limliting.Now electric capacity 701 starts have electric current to be flowed into by the output of the first LED unit 401, charges to electric capacity 701, and the ceiling voltage of its charging is the summation of VF2, VF3, VF4 voltage.
Said process is reversible process, when voltage drops to VF1+VF2+VF3 from VF1+VF2+VF3+VF4, now the output of operational amplifier 501 is high voltage, because input voltage reduces, do not reach and LED unit 401,402,403,404 is lighted simultaneously, do not have electric current to flow through transistor 604, directly cause resistance 206 first end voltage V4 to reduce, in feedback circuit, resistance 210 does not have electric current to flow through yet, and LED unit 401,402,403 works on.But due to the access of electric capacity 701, by the discharge loop of electric capacity 701 pairs of LED unit 402,403,404, make the 4th LED unit LED4 to continue luminescence, LED unit 401,402,403 has electric current to flow through always, therefore also achieves soft handover.Now voltage Vf declines with the decline of voltage, and such voltage V-is also a dynamic change voltage.So also just regulate the grid voltage of transistor 601,602,603, thus make transistor 601,602,603 be operated in amplification region, achieve current limliting.Same, when achieving voltage reduction, electric current raises, and power is remained unchanged.
When voltage drops to VF1+VF2 from VF1+VF2+VF3, now the output of operational amplifier 501 is high voltage, because input voltage reduces, do not reach and make LED unit 401, 402, 403 light simultaneously, electric current is not had to flow through transistor 603, 604, resistance 205 first end voltage V3 is directly caused to reduce, resistance 209 in feedback circuit, 210 do not have electric current to flow through yet, LED unit 401, 402 work on, due to the access of electric capacity 701, by electric capacity 701 pairs of LED unit 402, 403, the discharge loop of 404, make LED unit 403, 404 can continue luminescence.Due to LED unit 403 extinguish time, LED unit 401,402 has electric current to flow through always, therefore also achieves soft handover, now voltage Vf declines with the decline of voltage, and such voltage V-is also a dynamic change voltage; So also just regulate the grid voltage of transistor 601,602, thus make transistor 601,602 be operated in amplification region, achieve current limliting.
When voltage drops to VF1 from VF1+VF2, the output of operational amplifier 501 is high voltage.Input voltage reduces, and LED unit 401,402 can not be made simultaneously to light, do not have electric current to flow through transistor 602,603,604.Thus the voltage V2 of resistance 204 one end is reduced, in feedback circuit, resistance 208,209,210 does not have electric current to flow through.Due to the access of electric capacity 701, by the discharge loop of electric capacity 701 pairs of LED unit 402,403,404, make LED unit 402,403,404 to continue luminescence, LED unit 401 works on.Due to LED unit 402 extinguish time, LED unit 401 has electric current flow through always, therefore also achieves soft handover.Now voltage Vf declines with the decline of voltage, and voltage V-is a dynamic change voltage.Thus have adjusted the grid voltage of transistor 601, make transistor 601 be operated in amplification region, achieve current limliting.When achieving voltage reduction, electric current raises, and power is remained unchanged.When voltage drops to 0V from VF1, the output of operational amplifier 501 is high voltage.Input voltage reduces, and can not light LED unit 401, therefore make that transistor 601,602,603,604 does not have electric current to flow through.Due to the access of electric capacity 701, by the discharge loop of electric capacity 701 pairs of LED unit 402,403,404, LED unit 402,403,404 is made to continue luminescence.The first LED unit 401 is so only had to extinguish.
Do not use electrochemical capacitor required in traditional switch power technology in this drive circuit, thus the life-span is long.There is no inductance in same drive circuit, thus there is good EMC characteristic yet.This circuit structure is simple, and cost is low, and the life-span is long.Simultaneously owing to have employed soft hand-off, therefore in dimming process, LED, without stroboscopic, can improve the lighting experience of user.Have employed power compensating circuit in circuit, when voltage change, power can be made to remain unchanged.Because there is the access of electric capacity 701, the stroboscopic degree of depth of light output is reduced greatly.
Preferably, in order to improve the dimming effect of light fixture in TRICA light modulation, in conjunction with the feature of drive circuit and the demand of light fixture bright dipping, need the LED in LED light source module 5 to arrange according to certain distribution mode.Because in TRICA light modulation, adjustment brightness to time the darkest, can cause LED unit 404,403,402,401 to be extinguished successively by the brightest.In order to realize in dimming process uniform in light emission on LED light source module 5 and there is no dim spot, need to do certain arrangement to the distribution of LED unit 401,402,403,404.As shown in Figure 8, be the first LED unit 401 by LED unit 401,402,403,404 according to middle two rows, and then respectively arrange toward both sides successively and one ranked second LED unit 402, the 3rd LED unit the 403, four LED unit 404.Like this in dimming process, LED unit 404,403,402,401 is extinguished successively, LED fluorescent lamp tube can not be caused to occur the situation of middle discontinuous bright dipping, make whole fluorescent tube be still bar shaped bright dipping in dimming process, improve the light-emitting uniformity of LED light source module 5.
It should be noted that; above-mentioned specific embodiment is exemplary; those skilled in the art can find out various solution under the inspiration of the utility model disclosure, and these solutions also all belong to open scope of the present utility model and fall within protection domain of the present utility model.It will be understood by those skilled in the art that the utility model description and accompanying drawing thereof are illustrative and not form limitations on claims.Protection domain of the present utility model is by claim and equivalents thereof.
Claims (10)
1. a LED fluorescent lamp tube for constant current driving, it comprises lamp socket (3), insulative pipe sleeve (4), LED light source module (5), radiator (7) and drive plate (8), it is characterized in that,
Described lamp socket (3) is fixed on the both sides of described insulative pipe sleeve (4), thus define a confined space, described LED light source module (5), described radiator (7) and described drive plate (8) are arranged in described confined space
(8) are provided with LED constant current drive unit to described drive plate, described LED constant current drive unit comprises rectification module (10), supply module (30), constant flow module, energy-storage units (70) and lighting module (40), described lighting module (40) comprises several LED unit
The output of described rectification module (10) connects described supply module (30) and described lighting module (40) respectively, described energy-storage units (70) connects described lighting module (40) and described constant flow module, described constant flow module is arranged between described supply module (30) and described lighting module (40)
Described constant flow module is made up of control unit (50), switch module (60), compensating circuit (21) and sample circuit (20), described sample circuit (20) comprises several sampling resistors, described switch module (60) comprises several switch elements, each switch element comprises a transistor respectively
In each switch element, the drain electrode of its transistor is connected to output and the compensating circuit (21) of corresponding LED unit, the grid of its transistor connects described control unit (50), and the source electrode of its transistor is connected to the source electrode of the transistor of next switch element via the sampling resistor of correspondence.
2. LED fluorescent lamp tube as claimed in claim 1, it is characterized in that, described rectification module (10) comprises the first rectifier arm and the second rectifier arm that are made up of four diodes, the first diode (101) in described four diodes and the second diode (102) described first rectifier arm in series, the 3rd diode (103) in described four diodes and the 4th diode (104) described second rectifier arm in series, described diode is commutation diode or Schottky diode.
3. LED fluorescent lamp tube as claimed in claim 1, it is characterized in that, described supply module (30) comprises the first power supply branch road and the second power supply branch road, described first power supply branch road and described second power supply branch circuit parallel connection are between the output plus terminal and output negative terminal of described rectification module (10), first power supply branch road comprises the first current-limiting resistance (201) and the first voltage-stabiliser tube (301), wherein, the negative terminal of described first voltage-stabiliser tube (301) connects the in-phase end of the operational amplifier (501) of described first current-limiting resistance (201) and described control unit (50), described second power supply branch road comprises the second current-limiting resistance (202) and the second voltage-stabiliser tube (302), the negative terminal of described second voltage-stabiliser tube (302) connects the feeder ear (VCC) of described second current-limiting resistance (202) and described operational amplifier (501), described second current-limiting resistance (202) and described first current-limiting resistance (201) are connected to the output plus terminal of described rectification module (10) jointly, the anode of described second voltage-stabiliser tube (302) and the anode of described first voltage-stabiliser tube (301) are connected to the output negative terminal of described rectification module (10) jointly.
4. LED fluorescent lamp tube as claimed in claim 3, it is characterized in that, described supply module (30) also comprises the first filter capacitor (304) and the second filter capacitor (303), wherein, the negative terminal of described first voltage-stabiliser tube (301) and one end of described first filter capacitor (304) are connected to the in-phase end of described operational amplifier (501) jointly, the negative terminal of described second voltage-stabiliser tube (302) and one end of described second filter capacitor (303) are connected to the feeder ear (VCC) of described operational amplifier (501) jointly, and the other end of described first filter capacitor (304) and the other end of described second filter capacitor (303) are connected to the output negative terminal of described rectification module (10) jointly.
5. LED fluorescent lamp tube as claimed in claim 4, it is characterized in that, described compensating circuit (21) comprises several resistance, wherein, one end of each resistance is connected to the end of oppisite phase of described operational amplifier (501) jointly, the other end of feedback resistance (211) connects source electrode and first sampling resistor (203) of the first transistor (601), the other end of the first resistance (207) is connected to the drain electrode of described the first transistor (601), the other end of the second resistance (208) is connected to the drain electrode of transistor seconds (602), the other end of the 3rd resistance (209) is connected to the drain electrode of third transistor (603), the other end of the 4th resistance (210) is connected to the drain electrode of the 4th transistor (604).
6. LED fluorescent lamp tube as claimed in claim 5, it is characterized in that, described transistor is N-MOSFET or NPN type triode, the drain electrode of described the first transistor (601) is connected to the drain electrode of described transistor seconds (602) via the first sampling resistor (203), the drain electrode of described transistor seconds (602) is connected to the drain electrode of described third transistor (603) via the second sampling resistor (204), the drain electrode of described third transistor (603) is connected to the drain electrode of described 4th transistor (604) via the 3rd sampling resistor (205), the drain electrode of described 4th transistor (604) is via the 4th sampling resistor (206) ground connection, and the grid of described transistor is all connected to the output of described operational amplifier (501).
7. LED fluorescent lamp tube as claimed in claim 1, it is characterized in that, described energy-storage units (70) is made up of a storage capacitor (701), one end of described storage capacitor (701) connects the output of the first LED unit (401), and its other end connects the output of the 4th LED unit (404).
8. LED fluorescent lamp tube as claimed in claim 7, it is characterized in that, described drive plate (8) and described LED light source module (5) have electrical connection, the alternating current input of described drive plate (8) is drawn by wire, and described LED light source module (5) is single low-voltage light source or the high-voltage LED module adopting COB encapsulation.
9. LED fluorescent lamp tube as claimed in claim 8, it is characterized in that, described radiator (7) is arranged at the below of described LED light source module (5) and contacts with it, described radiator (7) is in strip, its length is more than or equal to the length of described LED light source module (5), and described radiator (7) becomes described LED light source module (5) coated by described radiator (7) half with the cross section of described LED light source module (5); The arranged outside of described lamp socket (3) has electrode contact pin (9), and described drive plate (8) accesses described electrode contact pin (9) by wire.
10. LED fluorescent lamp tube as claimed in claim 9, it is characterized in that, described first LED unit (401) is arranged in middle two rows, and the second LED unit (402), the 3rd LED unit (403) and described 4th LED unit (404) are arranged from inside to outside successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844798.8U CN205137161U (en) | 2015-10-28 | 2015-10-28 | Constant current drive's LED fluorescent tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844798.8U CN205137161U (en) | 2015-10-28 | 2015-10-28 | Constant current drive's LED fluorescent tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205137161U true CN205137161U (en) | 2016-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520844798.8U Expired - Fee Related CN205137161U (en) | 2015-10-28 | 2015-10-28 | Constant current drive's LED fluorescent tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205137161U (en) |
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2015
- 2015-10-28 CN CN201520844798.8U patent/CN205137161U/en not_active Expired - Fee Related
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Granted publication date: 20160406 Termination date: 20181028 |