CN205071401U - A LED constant -current drive apparatus - Google Patents
A LED constant -current drive apparatus Download PDFInfo
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- CN205071401U CN205071401U CN201520844970.XU CN201520844970U CN205071401U CN 205071401 U CN205071401 U CN 205071401U CN 201520844970 U CN201520844970 U CN 201520844970U CN 205071401 U CN205071401 U CN 205071401U
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Abstract
The utility model relates to a LED constant -current drive apparatus, it includes rectifier module, power module, sampling unit, constant -current module and lighting module, lighting module includes a plurality of LED unit. Power module and lighting module are connected respectively to rectifier module's output, and constant -current module connects lighting module, power module and sampling unit respectively to sampling unit sets up between constant -current module and power module. Constant -current module includes a plurality of constant current unit, wherein every constant current unit include respectively a fortune put with a transistor. In every constant current unit, the drain electrode of its transistor is connected to the output of corresponding LED unit, the source connection sampling unit of its transistor, and the output that its fortune was put is connected to the grid of its transistor, and power module is connected to the homophase end that its fortune was put, and the inverting terminal that its fortune was put connects sampling unit. The utility model discloses a LED constant -current drive apparatus is small, and is with low costs to have high power factor and good EMC characteristic.
Description
Technical field
The utility model relates to technical field of LED illumination, particularly relates to a kind of LED constant current drive unit.
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 power supply 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, use LED illumination product to save electric energy, 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 illumination product, 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 illumination product is once damage, the value of substantially not keeping in repair, needs directly to change driving power, but due to the restriction of limited LED illumination product power supply cavity, generally can only change and specify producer, specify the driving power of model, and maintenance process be 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 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 (utilance is lower than 60%).Therefore a kind of technology is needed can to resolve the problem of prior art.Such as, Chinese patent CN201220192184.2 discloses a kind of constant current driver circuit for LED, and it comprises power circuit, constant-current circuit and LED group, each LED two ends reverse parallel connection voltage-stabiliser tube.Constant-current circuit comprises two electronic circuits, and described electronic circuit is by transistor, and voltage-stabiliser tube and resistance are formed.This technical scheme makes circuit can normally work when there being LED that open circuit occurs, but constant-current circuit is Linear CCS, the problem that still utilance that causes of unresolved starting resistor is on the low side.
Utility model content
For the deficiency of prior art, the utility model provides a kind of LED constant current drive unit, and it comprises rectification module, supply module, sampling unit, constant flow module 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, described constant flow module connects described lighting module, described supply module and described sampling unit respectively, and described sampling unit is arranged between described constant flow module and described supply module
Described constant flow module comprises several constant current unit, and wherein each constant current unit comprises an amplifier and a transistor respectively,
In each constant current unit, the drain electrode of its transistor is connected to the output of corresponding LED unit, and the source electrode of its transistor connects described sampling unit, and the grid of its transistor connects the output of its amplifier,
In each constant current unit, the in-phase end of its amplifier connects described supply module, and the end of oppisite phase of its amplifier connects described sampling unit.
According to a preferred implementation, 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, and the 3rd diode in described four diodes and the 4th Diode series form described second rectifier arm.
According to a preferred implementation, described diode is rectifier diode or Schottky diode.
According to a preferred implementation, described supply module comprises reference voltage circuit and power supply circuits, and described reference voltage circuit and described power supply circuits are connected in parallel on the output plus terminal of described rectification module and export between negative terminal.
According to a preferred implementation, described reference voltage circuit comprises four voltage-stabiliser tubes of the first current-limiting resistance and series connection mutually, wherein, the negative terminal of the first voltage-stabiliser tube connects the in-phase end of described first current-limiting resistance and amplifier, the negative terminal of the second voltage-stabiliser tube connects the in-phase end of described first voltage-stabiliser tube and amplifier, the negative terminal of the 3rd voltage-stabiliser tube connects the in-phase end of described second voltage-stabiliser tube and amplifier, and the negative terminal of the 4th voltage-stabiliser tube connects the in-phase end of described first voltage-stabiliser tube and amplifier.
According to a preferred implementation, described power supply circuits comprise the second current-limiting resistance and the 5th voltage-stabiliser tube, wherein, the negative terminal of described 5th voltage-stabiliser tube connects described second current-limiting resistance, and the negative terminal of described 5th voltage-stabiliser tube is connected to the feeder ear of each amplifier respectively, described first current-limiting resistance and described second current-limiting resistance are connected to the output plus terminal of described rectification module jointly, and the anode of described 4th voltage-stabiliser tube and the anode of described 5th voltage-stabiliser tube are connected to the output negative terminal of described rectification module jointly.
According to a preferred implementation, described sampling unit comprises a sampling resistor, one end of described sampling resistor is connected to the output negative terminal of described rectification module, the other end of described sampling resistor is connected to the end of oppisite phase of each amplifier respectively, and the other end of described sampling resistor is also connected to the source electrode of each transistor respectively.
According to a preferred implementation, described transistor is N-MOSFET or NPN type triode.
According to a preferred implementation, described LED unit is made up of many or single low-voltage LED, and the connected mode of described LED sampling series connection or connection in series-parallel combination connects.
According to a preferred implementation, described LED unit is the high-voltage LED module adopting COB encapsulation.
The beneficial effects of the utility model are:
The circuit structure of LED constant current drive unit is simple, and volume is little, cost is low, easy to utilize.Constant current driver circuit for LED can adjust the onunit number of LED with change in voltage, make the curent change driven close to change in voltage, have higher power factor, and can put forward high-tension utilance.Do not adopt electrochemical capacitor and inductance in circuit, make the long service life of LED lamp, there is good EMC characteristic simultaneously.The size of input current can be changed in drive circuit by the resistance changing sampling resistor, therefore can adjust input power, and adjustment process is simple and reliable.
Accompanying drawing explanation
Fig. 1 is driving circuit structure figure of the present utility model;
Fig. 2 provides concrete driving circuit principle figure for the utility model;
Fig. 3 is the oscillogram of input ac voltage in the utility model;
Fig. 4 is by the voltage oscillogram after rectification module in the utility model;
Fig. 5 is the performance plot of each reference voltage in the utility model;
Fig. 6 is input voltage and the time dependent oscillogram of input current in the utility model.
Embodiment
The utility model is further illustrated below in conjunction with accompanying drawing.As shown in Figure 1, LED constant current drive unit of the present utility model comprises rectification module 10, supply module, sampling unit 20, constant flow module and lighting module 50.The output of rectification module 10 connects supply module and lighting module 50 respectively.Constant flow module connects lighting module 50, supply module and sampling unit 20 respectively, and sampling unit 20 is arranged between constant flow module and supply module.Constant flow module comprises several constant current unit, and wherein each constant current unit comprises an amplifier and a transistor respectively.In each constant current unit, the drain electrode of its transistor is connected to the output of corresponding LED unit, and the source electrode of its transistor connects sampling unit 20, and the grid of its transistor connects the output of its amplifier.In each constant current unit, the in-phase end of its amplifier connects supply module, and the end of oppisite phase of its amplifier connects sampling unit 20.
The circuit structure of LED constant current drive unit is simple, volume is little, cost is low, has High Power Factor.Can also increase operation rate, adjustment electric current is simple, reliable.The working method of circuit is the onunit number adjusting LED with change in voltage, make the curent change driven close to change in voltage, the benefit that this circuit directly brings has higher power factor (being not less than 0.95), and can put forward again high-tension utilance (being greater than 90%).Do not use electrochemical capacitor required in traditional switch power technology in drive circuit, thus the life-span is high.There is no inductance in drive circuit, thus there is good EMC characteristic yet.
As shown in Figure 2, rectification module 10 comprises 4 diodes 101,102,103,104.Reference voltage circuit 30 comprises 4 voltage-stabiliser tubes 301,302,303,304 and first current-limiting resistance 201.Power supply circuits 31 comprise the second current-limiting resistance 202 and the 5th voltage-stabiliser tube 305.Sampling unit 20 comprises sampling resistor 203; Constant current unit 40 comprises 1 amplifier 501 and 1 transistor 601.Constant current unit 41 comprises 1 amplifier 502 and 1 transistor 603.Constant current unit 42 comprises 1 amplifier 503 and 1 transistor 603.Constant current unit 43 it comprise 1 amplifier 504 and 1 transistor 604.Supply module comprises reference voltage circuit 30 and power supply circuits 31.Constant flow module comprises several constant current unit 40,41,42,43.Lighting module 50 comprises several LED unit.LED unit can be made up of many or single low-voltage LED light source, also can be the high-voltage LED module adopting COB encapsulation.
Lighting module 50 comprises multiple LED unit LED1, LED2, LED3, LED4.The LED quantity of each LED unit is not less than or equal to one, adopts series system to connect, and also can be adopt to go here and there and the mode combined connects.Diode 101,102,103,104 can be common rectifier 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.As shown in Figure 2, first input end IN1 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 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.Reference voltage circuit 30 and power supply circuits 31 are connected in parallel on the output plus terminal of rectification module 10 and export between negative terminal.One end of first current-limiting resistance 201 connects the output plus terminal of rectification module 10.The other end of the first current-limiting resistance 201 and the negative terminal of the first voltage-stabiliser tube 301 are connected to the in-phase end of amplifier 504 jointly.The anode of the first voltage-stabiliser tube 301 and the negative terminal of the second voltage-stabiliser tube 302 are connected to the in-phase end of amplifier 503 jointly.The anode of the second voltage-stabiliser tube 302 and the negative terminal of the 3rd voltage-stabiliser tube 303 are connected to the in-phase end of amplifier 502 jointly.The anode of the 3rd voltage-stabiliser tube 303 and the negative terminal of the 4th voltage-stabiliser tube 304 are connected to the in-phase end of amplifier 501 jointly.The anode of the 4th voltage-stabiliser tube 304 connects the output negative terminal of rectification module 10.One end of second current-limiting resistance 202 connects one end of the first current-limiting resistance 201 and the output plus terminal of rectification module 10.The other end of the second current-limiting resistance 202 is connected with the negative terminal of the 5th voltage-stabiliser tube 305, and its connected node is connected to the feeder ear of amplifier 501,502,503,504 respectively.The anode of the 5th voltage-stabiliser tube 305, the anode of the 4th voltage-stabiliser tube 304 and one end of sampling resistor 203 are connected to the output negative terminal of rectification module 10 jointly, and the output negativing ending grounding of rectification module 10.The other end of sampling resistor 203 connects the end of oppisite phase of amplifier 501,502,503,504 respectively, and the other end of sampling resistor 203 is also connected to the source electrode of transistor 601,602,603,604 respectively.The output of amplifier 501 is connected with the grid of transistor 601, and the output of amplifier 502 is connected with the grid of transistor 602.The output of amplifier 503 is connected with the grid of transistor 603, and the output of amplifier 504 is connected with the grid of transistor 604.Lighting module 50 is divided into multiple LED unit LED1, LED2, LED3, LED4 according to different combinations.Wherein, the input of the first LED unit LED1 connects the output plus terminal of rectification module 10.The output of the first LED light source LED1 connects the input of the second LED unit LED2 and the drain electrode of transistor 601.The output of the second LED unit LED2 connects the input of the 3rd LED unit LED3 and the drain electrode of transistor 602.The output of the 3rd LED unit LED3 connects the input of the 4th LED unit LED4 and the drain electrode of transistor 603.The output of the 4th LED unit LED4 is connected with the drain electrode of transistor 604.
The specific works principle of LED constant current drive unit is as follows: the voltage oscillogram of electric main as shown in Figure 3.Electric main output ripple direct current after the bridge rectifier that rectifier diode 101,102,103,104 forms.The voltage oscillogram of Rectified alternating current as shown in Figure 4.Rectified alternating current is by the first current-limiting resistance 201, voltage-stabiliser tube 301,302,303,304.As shown in Figure 5, a stable reference voltage Vref 4 is obtained at the negative terminal of voltage-stabiliser tube 301, the negative terminal of voltage-stabiliser tube 302 obtains a stable reference voltage Vref 3, the negative terminal of voltage-stabiliser tube 303 obtains a stable reference voltage Vref 2, and the negative terminal of voltage-stabiliser tube 304 obtains a stable reference voltage Vref 1.With reference to Vref1 for providing the reference voltage of the in-phase end needed for amplifier 501; With reference to Vref2 for providing the reference voltage of the in-phase end needed for amplifier 502; With reference to Vref3 for providing the reference voltage of the in-phase end needed for amplifier 503; With reference to Vref4 for providing the reference voltage of the in-phase end needed for amplifier 504.Described reference voltage meets following characteristics: Vref4>Vref3>Vref2GreatT.Grea T.GTVref1.
Rectified alternating current, by after the second current-limiting resistance 202 and the 5th voltage-stabiliser tube 305, obtains a stable voltage V1 at the negative terminal of the 5th voltage-stabiliser tube 305 and is used for providing amplifier 501,502,503,504 operating voltage;
Sampling resistor 203 flows through the electric current of each unit in LED light source for setting.The forward conduction voltage of LED unit LED1, LED2, LED3, LED4 is Vf1, Vf2, Vf3, Vf4.And this feature of this voltage conforms: VF1=Vf1; VF2=Vf1+Vf2; VF3=Vf1+Vf2+Vf3; VF4=Vf1+Vf2+Vf3+Vf4<=Vmax.
As shown in Figure 6, when initial, when pulsating dc voltage rises to VF1 by 0V, the resistance value of the end of oppisite phase of amplifier 501 is the resistance of sampling resistor 203.In-phase end voltage due to now amplifier 501 is greater than the end of oppisite phase voltage of amplifier 501, and amplifier 501 output end voltage is high voltage.Thus transistor 601 is in conducting state, start luminous after such LED unit LED1 conducting.Electric current after LED unit LED1 and transistor 601, then flows through sampling resistor 203, obtains a feedback voltage at the end of oppisite phase of amplifier 501, for regulating the grid voltage of transistor 601.Thus make transistor 601 be operated in amplification region, achieving constant current, is the reference voltage Vref 1 close to in-phase end at the voltage of the end of oppisite phase of amplifier 501.
When voltage rises to VF2 from VF1, the resistance value of the end of oppisite phase of amplifier 502 is the resistance of sampling resistor 203.In-phase end voltage due to now amplifier 502 is greater than the end of oppisite phase voltage of amplifier 502, and the output end voltage of amplifier 502 is high voltage.Thus make transistor 602 be in conducting state, start luminous after such LED unit LED1, LED2 conducting.Electric current is after LED unit LED1, LED2 and transistor 602, flowing through sampling resistor 203 again, obtaining the voltage of a feedback at the end of oppisite phase of amplifier 502, for regulating the grid voltage of transistor 602, thus make transistor 602 be operated in amplification region, achieve constant current.In the reference voltage Vref 2 that the voltage of the end of oppisite phase of amplifier 502 is close to in-phase end, therefore voltage resistance 203 obtained is infinitely close to reference voltage Vref 2, the voltage that this results in the end of oppisite phase being connected to amplifier 501 is also infinite approach reference voltage Vref 2, because reference voltage Vref 2 is higher than reference voltage Vref 1, now the output of amplifier 501 is low-voltage, makes transistor 601 be in cut-off state.
When voltage rises to VF3 from VF2, the resistance value of the end of oppisite phase of amplifier 503 is the resistance of resistance 203, and because the in-phase end voltage of now amplifier 503 is greater than amplifier 503 end of oppisite phase voltage, amplifier 503 output end voltage is high voltage.Thus make transistor 603 be in conducting state, start luminous after such LED unit LED1, LED2, LED3 conducting.Electric current after LED unit LED1, LED2, LED3 and transistor 603, then flows through sampling resistor 203, obtains a feedback voltage at the end of oppisite phase of amplifier 503.Feedback voltage for regulating the grid voltage of transistor 603, thus makes transistor 603 be operated in amplification region, achieves constant current.The voltage of the end of oppisite phase of amplifier 503 is the reference voltage Vref 3 close to in-phase end, therefore the voltage on sampling resistor 203 is infinitely close to reference voltage Vref 3, makes the voltage being connected to the end of oppisite phase of amplifier 501 and the end of oppisite phase of amplifier 502 also for infinite approach is with reference to Vref3.Because reference voltage Vref 3 is higher than reference voltage Vref 1, Vref2, now the output of amplifier 502 is low-voltage, makes transistor 602 be in cut-off state.The voltage of the end of oppisite phase of amplifier 501 is also higher than reference voltage Vref 1 simultaneously, and make the output low-voltage of amplifier 501, therefore transistor 601 is also in cut-off state.
When voltage rises to VF4 from VF3, the resistance value of the end of oppisite phase of amplifier 504 is the resistance of sampling resistor 203, and because the in-phase end voltage of now amplifier 504 is greater than amplifier 504 end of oppisite phase voltage, amplifier 504 output end voltage is high voltage.Thus make transistor 604 be in conducting state, start luminous after such LED unit LED1, LED2, LED3, LED4 conducting.Electric current after LED unit LED1, LED2, LED3, LED4 and transistor 604, then flows through sampling resistor 203, obtains a feedback voltage at the end of oppisite phase of amplifier 504.Feedback voltage for regulating the grid voltage of transistor 604, thus makes transistor 604 be operated in amplification region, achieves constant current.The voltage of the end of oppisite phase of amplifier 504 is the reference voltage Vref 4 close to in-phase end, therefore voltage sampling resistor 203 obtained is infinitely close to reference voltage Vref 4, makes the voltage of the end of oppisite phase being connected to the end of oppisite phase of amplifier 501 and the end of oppisite phase of amplifier 502 and amplifier 503 also be infinite approach reference voltage Vref 4.Because reference voltage Vref 4 is higher than reference voltage Vref 1, Vref2, Vref3, the now output low-voltage of amplifier 503, makes transistor 603 be in cut-off state; The voltage of the end of oppisite phase of amplifier 502 is also higher than reference voltage Vref 2 simultaneously, and make the output low-voltage of amplifier 502, therefore transistor 602 is also in cut-off state.Same, the voltage of the end of oppisite phase of amplifier 501 is higher than reference voltage Vref 1, and make the output of amplifier 501 be low-voltage, therefore transistor 601 is in cut-off state.
Said process is reversible process, when voltage drops to VF3 from VF4, although now the output of amplifier 504 is high voltage, because voltage reduces, can not make LED unit LED1, LED2, LED3, LED4 light simultaneously.The feedback voltage that sampling resistor 203 obtains reduces, and the feedback voltage of the end of oppisite phase of amplifier 503 is also reduced.When this feedback voltage is reduced to lower than reference voltage Vref 3, with regard to making the output of amplifier 503 be high voltage, transistor 603 is directly made to be in the operating state of amplification region.Such electric current flows through LED unit LED1, LED2, LED3 and transistor 603, LED unit LED1, LED2, LED3 and continues luminescence, and LED unit LED4 extinguishes.
When voltage drops to VF2 from VF3, the output of amplifier 503,504 is all high voltage, due to voltage drop, LED unit LED1, LED2, LED3 can not be lighted simultaneously.Therefore transistor 603,604 does not have electric current to flow through, the voltage drop on resistance 203, to during lower than reference voltage Vref 2, just makes the voltage of the end of oppisite phase of amplifier 502 lower than reference voltage Vref 2.Thus making the output of amplifier 502 be high voltage, transistor 602 is operated in amplification region.Such electric current flows through LED unit LED1, LED2 and transistor 602, LED unit LED1, LED2 continues luminescence, and LED unit LED3, LED4 extinguish.
When voltage drops to VF1 from VF2, the output of amplifier 502,503,504 is all high voltage, due to voltage drop, LED unit LED1, LED2, LED3 can not be lighted simultaneously.Therefore make that transistor 602,603,604 does not have electric current to flow through, when the feedback voltage that resistance 203 obtains is reduced to lower than reference voltage Vref 1, the voltage of the end of oppisite phase of amplifier 501, lower than reference voltage Vref 1, makes the output of amplifier 501 be high voltage.Transistor 601 begins operating in amplification region.Such electric current flows through LED unit LED1 and transistor 601, LED unit LED1 continues luminescence, and LED unit LED2, LED3, LED4 extinguish.
When voltage drops to 0v from VF1, the output of amplifier 501,502,503,504 is all high voltage, due to voltage drop, LED unit LED1 can not be lighted, therefore make that transistor 601,602,603,604 does not have electric current to flow through, such LED unit LED1, LED2, LED3, LED4 all extinguish.
The circuit structure of LED constant current drive unit is simple, volume is little, cost is low, has High Power Factor.Can also increase operation rate, adjustment electric current is simple, reliable.The working method of circuit is the onunit number adjusting LED with change in voltage, make the curent change driven close to change in voltage, the benefit that this circuit directly brings has higher power factor (being not less than 0.95), and can put forward again high-tension utilance (being greater than 90%).Do not use electrochemical capacitor required in traditional switch power technology in drive circuit, thus the life-span is high.There is no inductance in drive circuit, thus there is good EMC characteristic yet.The size of input current can be changed in drive circuit by the resistance changing sampling resistor, therefore can regulate input power, and adjustment process is simple and reliable.
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 range of the present utility model.It will be understood by those skilled in the art that the utility model specification and accompanying drawing thereof are illustrative and not form limitations on claims.Protection range of the present utility model is by claim and equivalents thereof.
Claims (10)
1. a LED constant current drive unit, it comprises rectification module (10), supply module, sampling unit (20), constant flow module and lighting module (50), described lighting module (50) comprises several LED unit, it is characterized in that
The output of described rectification module (10) connects described supply module and described lighting module (50) respectively, described constant flow module connects described lighting module (50), described supply module and described sampling unit (20) respectively, and described sampling unit (20) is arranged between described constant flow module and described supply module
Described constant flow module comprises several constant current unit, and wherein each constant current unit comprises an amplifier and a transistor respectively,
In each constant current unit, the drain electrode of its transistor is connected to the output of corresponding LED unit, and the source electrode of its transistor connects described sampling unit (20), and the grid of its transistor connects the output of its amplifier,
In each constant current unit, the in-phase end of its amplifier connects described supply module, and the end of oppisite phase of its amplifier connects described sampling unit (20).
2. LED constant current drive unit according to 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 in described four diodes and the second Diode series form described first rectifier arm, and the 3rd diode in described four diodes and the 4th Diode series form described second rectifier arm.
3. LED constant current drive unit according to claim 2, is characterized in that, described diode is rectifier diode or Schottky diode.
4. LED constant current drive unit according to claim 1, it is characterized in that, described supply module comprises reference voltage circuit (30) and power supply circuits (31), and described reference voltage circuit (30) and described power supply circuits (31) are connected in parallel on the output plus terminal of described rectification module (10) and export between negative terminal.
5. LED constant current drive unit according to claim 4, it is characterized in that, described reference voltage circuit (30) comprises four voltage-stabiliser tubes of the first current-limiting resistance (201) and series connection mutually, wherein, the negative terminal of the first voltage-stabiliser tube (301) connects the in-phase end of described first current-limiting resistance (201) and amplifier (504), the negative terminal of the second voltage-stabiliser tube (302) connects the in-phase end of described first voltage-stabiliser tube (301) and amplifier (503), the negative terminal of the 3rd voltage-stabiliser tube (303) connects the in-phase end of described second voltage-stabiliser tube (302) and amplifier (502), the negative terminal of the 4th voltage-stabiliser tube (304) connects the in-phase end of described first voltage-stabiliser tube (303) and amplifier (501).
6. LED constant current drive unit according to claim 5, it is characterized in that, described power supply circuits (31) comprise the second current-limiting resistance (202) and the 5th voltage-stabiliser tube (305), wherein, the negative terminal of described 5th voltage-stabiliser tube (305) connects described second current-limiting resistance (202), and the negative terminal of described 5th voltage-stabiliser tube (305) is connected to the feeder ear of each amplifier respectively, described first current-limiting resistance (201) and described second current-limiting resistance (202) are connected to the output plus terminal of described rectification module (10) jointly, the anode of described 4th voltage-stabiliser tube (304) and the anode of described 5th voltage-stabiliser tube (305) are connected to the output negative terminal of described rectification module (10) jointly.
7. LED constant current drive unit according to claim 1, it is characterized in that, described sampling unit (20) comprises a sampling resistor (203), one end of described sampling resistor (203) is connected to the output negative terminal of described rectification module (10), the other end of described sampling resistor (203) is connected to the end of oppisite phase of each amplifier respectively, and the other end of described sampling resistor (203) is also connected to the source electrode of each transistor respectively.
8. LED constant current drive unit according to claim 7, is characterized in that, described transistor is N-MOSFET or NPN type triode.
9. LED constant current drive unit according to claim 1, is characterized in that, described LED unit is made up of many or single low-voltage LED, and the connected mode of described LED sampling series connection or connection in series-parallel combination connects.
10. LED constant current drive unit according to claim 1, is characterized in that, described LED unit is the high-voltage LED module adopting COB encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844970.XU CN205071401U (en) | 2015-10-28 | 2015-10-28 | A LED constant -current drive apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844970.XU CN205071401U (en) | 2015-10-28 | 2015-10-28 | A LED constant -current drive apparatus |
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| CN205071401U true CN205071401U (en) | 2016-03-02 |
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| CN201520844970.XU Expired - Fee Related CN205071401U (en) | 2015-10-28 | 2015-10-28 | A LED constant -current drive apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493914A (en) * | 2019-08-14 | 2019-11-22 | 广州竟合电子科技有限公司 | A kind of car light constant current driving device and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493914A (en) * | 2019-08-14 | 2019-11-22 | 广州竟合电子科技有限公司 | A kind of car light constant current driving device and its manufacturing method |
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Granted publication date: 20160302 Termination date: 20171028 |