CN202206616U - Constant current driving power supply for illumination of Light Emitting Diode (LED) - Google Patents

Constant current driving power supply for illumination of Light Emitting Diode (LED) Download PDF

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Publication number
CN202206616U
CN202206616U CN2011203168044U CN201120316804U CN202206616U CN 202206616 U CN202206616 U CN 202206616U CN 2011203168044 U CN2011203168044 U CN 2011203168044U CN 201120316804 U CN201120316804 U CN 201120316804U CN 202206616 U CN202206616 U CN 202206616U
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China
Prior art keywords
circuit
current
connects
power supply
control circuit
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Expired - Fee Related
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CN2011203168044U
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Chinese (zh)
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王中华
李培植
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SHANGHAI XINHUA ELECTRONIC EQUIPMENT CO Ltd
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SHANGHAI XINHUA ELECTRONIC EQUIPMENT CO Ltd
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Abstract

The utility model discloses a constant current driving power supply for the illumination of a Light Emitting Diode (LED), which is used for driving the illumination of a high-power LED and comprises a power conversion main circuit and a control circuit. The power conversion main circuit comprises an Alternate Current (AC) input end, a full-bridge rectifying circuit, an active power factor boost converter, a half-bridge resonance Direct Current/Direct Current (DC/DC) converter and a DC constant current output end which are sequentially connected; the control circuit comprises a high power factor correction control circuit, an auxiliary power supply, a half-bridge resonance converter control circuit and a current feedback control circuit; the high power factor correction control circuit is connected with the active power factor boost converter; the half-bridge resonance DC/DC converter control circuit is connected with the half-bridge resonance DC/DC converter; and the current feedback control circuit is connected with the DC constant-current output end. The constant current driving power supply has the characteristics of wide voltage input, stable current output, high efficiency, high power density and complete protection functions.

Description

The constant-current driving power supply that is used for the LED illumination
Technical field
The utility model relates to a kind of constant-current driving power supply, relates in particular to a kind of constant-current driving power supply of the LED of being used for illumination.
Background technology
LED (Lighting Emitting Diode) is a light-emitting diode, is a kind of semiconductor solid luminescence device.It is to utilize the solid semiconductor chip as luminescent material, in semiconductor, through charge carrier compound energy of emitting surplus takes place and causes photo emissions, and is directly luminous.The LED illuminating product utilizes LED as the produced ligthing paraphernalia of light source exactly.LED be called as the 4th generation lighting source or green light source, have characteristics such as energy-saving and environmental protection, the life-span is long, volume is little, can be widely used in fields such as various indications, demonstration, decoration, backlight, general lighting and urban landscape.Led light source adopts DC driven, and the electric light power transfer is near 100% for super low-power consumption (0.03 watt-1 watt of single tube), and the equal illumination effect is more energy-conservation more than 80% than conventional light source.Led light source belongs to the solid cold light source, and epoxy encapsulation does not have loosening part yet in the lamp body, do not exist filament light-emitting to be prone to shortcomings such as burning, heat deposition, light decay, can reach 50,000 to 100,000 hours useful life, and is longer more than 10 times than the conventional light source life-span.Led light source belongs to typical green illumination light source.Do not have ultraviolet ray and infrared ray in the spectrum, heat is low and do not have stroboscopic, and is radiationless, and discarded object is recyclable, do not pollute not contain mercury element, and cold light source can safe touch.
At present LED all adopts DC driven, therefore between civil power and LED, need add a power supply adaptor, converts electric main the direct current of suitable LED to, and this power supply adaptor is exactly the LED driving power.The LED driving power is to convert the power supply supply into specific electric current and voltage with the luminous electric pressure converter of driving LED.Along with the application of LED is increasingly extensive, the performance of LED driving power will more and more be fit to the requirement of LED, and the stability that the LED power supply shows, energy saving and life-span length possess important effect to the work of LED.
Relate to following prior art in the utility model:
The DC/DC notion is meant that with a fixing dc voltage conversion be variable direct voltage; This technology is widely used in the infinitely variable speeds and the control of trolley bus, subway train, electric motor car; Make above-mentioned control obtain the performance of quickening steadily, responding fast simultaneously, and receive the effect of saves energy simultaneously.But replace rheostat saves energy (20-30) % with DC chopper.DC chopper can not only play pressure regulation (Switching Power Supply), can also play the effect that suppresses grid side harmonic current noise effectively simultaneously.
The EMC filter has another name called " Electro Magnetic Compatibility filter ", is mainly used in instrument and meter; In the automation control system; Be used for suppressing and eliminate on-the-spot strong electromagnetic of industrial automation system and electric spark interference, proofread and correct the field instrumentation instrument, guarantee the safe and reliable operation of automation control system.
Therefore; Those skilled in the art is devoted to develop a kind of constant-current driving power supply of the LED of being used for illumination; For LED illumination provides constant-current driving, it has stable DC output current and pressure limiting function, is applicable to global input voltage range, high efficiency, high power density, the complete characteristics of defencive function.
The utility model content
In view of this, the utility model technical problem to be solved provides a kind of constant-current driving power supply of the LED of being used for illumination, is used to drive high-power LED illumination.
For realizing above-mentioned purpose, the utility model provides a kind of constant-current driving power supply of the LED of being used for illumination, and the constant-current driving power supply of the said LED of being used for illumination comprises Power Conversion major loop and control loop; Said Power Conversion major loop comprises that successively full bridge rectifier that an ac input end connecting, one will import industrial-frequency alternating current and convert Rectified alternating current into, one are half-bridge resonance DC/DC converter and a direct current constant current output of high-frequency impulse with the active power factor booster converter, that pulsating dc voltage converts stable DC voltage into the stable DC voltage transitions; Said control loop comprises a high power factor correction control circuit, an accessory power supply, a half-bridge resonance DC/DC converter control circuit and Current Feedback Control circuit that connects successively; The output of said high power factor correction control circuit connects the input of said active power factor booster converter; The output of said half-bridge resonance DC/DC converter control circuit connects the input of said half-bridge resonance DC/DC converter, and the output of said Current Feedback Control circuit connects the input of said direct current constant current output.
Preferably, said Power Conversion major loop also comprises an EMC filter, and the input of said EMC filter connects said ac input end, and the output of said EMC filter connects said full bridge rectifier.
Preferably, said Power Conversion major loop also comprises a lightning protection surge absorbing circuit, and the input of said lightning protection surge absorbing circuit connects said EMC filter, and the output of said lightning protection surge absorbing circuit connects said full bridge rectifier.
Preferably; Said Power Conversion major loop also comprises an anti-start impulse current circuit; The input of said anti-start impulse current circuit connects said active power factor booster converter, and the output of said anti-start impulse current circuit connects said half-bridge resonance DC/DC converter.
Preferably; Said Power Conversion major loop comprises that also a paired pulses carries out the rectifier filter circuit of smothing filtering; The input of said rectifier filter circuit connects said half-bridge resonance DC/DC converter, and the output of said rectifier filter circuit connects said direct current constant current output.
Preferably, said control loop also comprises current foldback circuit, and said current foldback circuit connects said half-bridge resonance DC/DC converter control circuit.
Preferably, said control loop also comprises open loop protection circuit, and said open loop protection circuit connects said half-bridge resonance DC/DC converter control circuit.
Preferably, said control loop also comprises thermal-shutdown circuit, and said temperature protective circuit connects said half-bridge resonance DC/DC converter control circuit.
Preferably, said control loop also comprises short-circuit protection circuit, and said short-circuit protection circuit connects said half-bridge resonance DC/DC converter control circuit.
Preferably, said accessory power supply is respectively to said high power factor correction control circuit and the power supply of said half-bridge resonance DC/DC converter control circuit.
Owing to used above technology; The utility model compared with prior art; The Power Conversion major loop of the constant-current driving power supply that is used for the LED illumination of the utility model has adopted electric current TM type active power factor booster converter and half-bridge resonance DC/DC converter technology; Simple in circuits is reliable, and conversion efficiency is high; Control circuit is accomplished input voltage feed forward; Imported, under-voltage protection; Defencive functions such as output overcurrent, open circuit, the gentle short-circuit protection of mistake, thus constitute wide-range voltage input, the output of stable DC electric current, high efficiency, high power density, the complete constant-current driving power supply that is used for the LED illumination of defencive function.
Below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further, with purpose, characteristic and the effect of understanding the utility model fully.
Description of drawings
Fig. 1 is that the module of the constant-current driving power supply that is used for the LED illumination of the utility model connects block diagram.
Embodiment
As shown in Figure 1, the constant-current driving power supply that is used for the LED illumination of the utility model is used to drive high-power LED illumination, comprises Power Conversion major loop 1 and control loop 2.Power Conversion major loop 1 comprises that successively full bridge rectifier 14 that an ac input end connecting 11, one will import industrial-frequency alternating current and convert Rectified alternating current into, one are half-bridge resonance DC/DC converter 17 and a direct current constant current output 19 of high-frequency impulse with the active power factor booster converter 15, that pulsating dc voltage converts stable DC voltage into the stable DC voltage transitions.Control loop 2 comprises successively a high power factor correction control circuit connecting 101, accessory power supply 102, a half-bridge resonance DC/DC converter control circuit 103 and a Current Feedback Control circuit 104.The output of high power factor correction control circuit 101 connects the input of active power factor booster converter 15; The output of half-bridge resonance DC/DC converter control circuit 103 connects the input of half-bridge resonance DC/DC converter 17, and the output of Current Feedback Control circuit 104 connects the input of direct current constant current output 19.
Power Conversion major loop 1 comprises that also the anti-start of 13, one of 12, one lightning protection surge absorbing circuits of EMC filter impulse current circuit 16 and paired pulses carry out the rectifier filter circuit 18 of smothing filtering.The input of EMC filter 12 connects ac input end 11, and the output of EMC filter 12 connects full bridge rectifier 14.The input of lightning protection surge absorbing circuit 13 connects EMC filter 12, and the output of lightning protection surge absorbing circuit 13 connects full bridge rectifier 14.The input of anti-start impulse current circuit 16 connects active power factor booster converter 15, and the output of anti-start impulse current circuit 16 connects half-bridge resonance DC/DC converter 17.The input of rectifier filter circuit 18 connects half-bridge resonance DC/DC converter 17, and the output of rectifier filter circuit 18 connects direct current constant current output 19.EMC filter 12 is filters of absorbing high-frequency noise in the following frequency range of 30MHz.Accessory power supply 102 is respectively to high power factor correction control circuit 101 and 103 power supplies of half-bridge resonance DC/DC converter control circuit.Control loop 2 also comprises current foldback circuit 105, open loop protection circuit 106, thermal-shutdown circuit 107 and short-circuit protection circuit 108, connects half-bridge resonance DC/DC converter control circuit 103 respectively.
Below the constant-current driving power supply each several part of the LED of the utility model illumination is described in detail.
The interface J1 of ac input end 11 has enough dielectric voltage withstand intensity and safe spacing, and its connection has anti-seismic performance and anti-salt fog performance.
EMC filter 12 has the performance of absorbing high-frequency noise in the following frequency range of 30MHz, suppresses the influence of power supply high-frequency noise to ac power supply line; 2 Y capacitor C Y1 and CY2 and common mode inductance LF1 and LF2 form 2 grades of filters respectively and are used to remove common mode disturbances, and 2 X2 capacitor C 1 are used for the filtering DM EMI with C2 and differential mode inductance L3.
Lightning protection surge absorbing circuit 13 is mainly formed secondary by Zinc-oxide piezoresistor MOV1 and MOV4 and is absorbed protection, is used to absorb the surge of lightning induction surge and the generation in service of other inductive load, and the protection late-class circuit exempts from damage.
The rectifier bridge heap BD1 of full bridge rectifier 14 converts the industrial-frequency alternating current of input into the direct current of pulsation.
Start impulse current current-limiting circuit 16 is made up of thermistor RT1.Thermistor RT1 resistance is high-impedance state when start, thereby has limited the start surge current.After the circuit operate as normal, be low resistance state because the resistance of electric current through thermistor RT1 descends, anti-start impulse current current limliting process finishes.
The circuit of electric current TM type active power factor booster converter 15 mainly adopts resistance R 47 to form by boost inductance L4, high frequency power electronic switch Q17, Ultrafast recovery diode D2, electrochemical capacitor C7 and PFC electric current; The drive signal of Q17 is from high power factor correction controller U1; Electric current flows through inductive energy storage among the L4 when the Q17 conducting.The electric energy that stores among the L4 when Q17 ends charges to C7 through D3; The electric current of L4 of under the control of high power factor correction controller, flowing through is continuous, and the voltage of C7 also remains on the direct voltage of setting (400VDC), and this voltage does not receive the influence of input voltage fluctuation and load conversion.
Half-bridge resonance DC/DC converter 17 is mainly by high-frequency semiconductor power device Q8 and Q9, power main transformer T1, resonant inductance L7, and resonant capacitance C25 forms; Convert the direct voltage of APFC output into high frequency, the controlled potential pulse of pulsewidth through the isolated buck electronic transformer, realize function with the isolation of prime main circuit, step-down.
Rectifier filter circuit 18 comprises that mainly high pressure software feature Ultrafast recovery diode D18 and D19, big capacity electrochemical capacitor C34 and C44 form.When the end of the same name of T1 be correct time the main transformer secondary power to the load through the loop that D18 and C33, C44 form, when the end of the same name of T1 main transformer secondary when negative powers to the load with the loop of C33, C44 composition through D19.
The interface J2 of direct current constant current output 19 has enough dielectric voltage withstand intensity and safe spacing, and its connection has anti-seismic performance and anti-salt fog performance.
Through above-mentioned Power Conversion major loop 1, making output transform is satisfactory direct current constant current.
High power factor correction control circuit 101 is made up of the power factor correction controller and the some passive devices that adopt average-current mode.
Accessory power supply 102 is made up of secondary main winding and some other passive devices of transformer.
Half-bridge resonance DC/DC converter control circuit 103 mainly comprises half-bridge resonance controller and peripheral circuit, output current Control and Feedback circuit, output pressure limiting Control and Feedback circuit and high accuracy low temperature drift reference power source; Controller adopts current working mode, and peripheral circuit mainly comprises soft start capacitor, harmonic compensation circuit, oscillator outer meeting resistance and electric capacity, delay adjustments resistor network, error amplifier capacitance-resistance phase compensating network.
Current Feedback Control circuit 104 mainly comprises output current resistance sampling network, output reference current setting network, comparator and capacitance-resistance phase compensating network thereof.
Owing to used above technology; The Power Conversion major loop of the constant-current driving power supply that is used for the LED illumination of the utility model has adopted electric current TM type active power factor booster converter and half-bridge resonance DC/DC converter technology; Simple in circuits is reliable, and conversion efficiency is high; Control circuit is accomplished input voltage feed forward; Imported, under-voltage protection; Output open circuit, overload protection, output short circuit protection, defencive functions such as overheat protector, thus constitute wide-range voltage input, high efficiency, high power density, the complete constant-current driving power supply that is used for the LED illumination of defencive function.
More than describe the preferred embodiment of the utility model in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, the technical staff in all present technique field according to the design of the utility model on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection range by claims.

Claims (10)

1. a constant-current driving power supply that is used for the LED illumination is characterized in that: comprise Power Conversion major loop (1) and control loop (2);
Said Power Conversion major loop (1) comprises that successively full bridge rectifier (14) that the ac input end (11) that connects, one will import industrial-frequency alternating current and convert Rectified alternating current into, one are the half-bridge resonance DC/DC converter (17) and a direct current constant current output (19) of high-frequency impulse with the active power factor booster converter (15), that pulsating dc voltage converts stable DC voltage into the stable DC voltage transitions;
Said control loop (2) comprises a high power factor correction control circuit (101), an accessory power supply (102), a half-bridge resonance DC/DC converter control circuit (103) and a Current Feedback Control circuit (104) that connects successively;
The output of said high power factor correction control circuit (101) connects the input of said active power factor booster converter (15); The output of said half-bridge resonance DC/DC converter control circuit (103) connects the input of said half-bridge resonance DC/DC converter (17), and the output of said Current Feedback Control circuit (104) connects the input of said direct current constant current output (19).
2. the constant-current driving power supply that is used for the LED illumination as claimed in claim 1; Wherein said Power Conversion major loop (1) also comprises an EMC filter (12); The input of said EMC filter (12) connects said ac input end (11), and the output of said EMC filter (12) connects said full bridge rectifier (14).
3. the constant-current driving power supply that is used for the LED illumination as claimed in claim 1; Wherein said Power Conversion major loop (1) also comprises a lightning protection surge absorbing circuit (13); The input of said lightning protection surge absorbing circuit (13) connects said EMC filter (12), and the output of said lightning protection surge absorbing circuit (13) connects said full bridge rectifier (14).
4. the constant-current driving power supply that is used for the LED illumination as claimed in claim 1; Wherein said Power Conversion major loop (1) also comprises an anti-start impulse current circuit (16); The input of said anti-start impulse current circuit (16) connects said active power factor booster converter (15), and the output of said anti-start impulse current circuit (16) connects said half-bridge resonance DC/DC converter (17).
5. the constant-current driving power supply that is used for the LED illumination as claimed in claim 1; Wherein said Power Conversion major loop (1) comprises that also a paired pulses carries out the rectifier filter circuit of smothing filtering (18); The input of said rectifier filter circuit (18) connects said half-bridge resonance DC/DC converter (17), and the output of said rectifier filter circuit (18) connects said direct current constant current output (19).
6. like any described constant-current driving power supply that is used for the LED illumination in the claim 1 to 5; Wherein said control loop (2) also comprises current foldback circuit (105), and said current foldback circuit (105) connects said half-bridge resonance DC/DC converter control circuit (103).
7. like any described constant-current driving power supply that is used for the LED illumination in the claim 1 to 5; Wherein said control loop (2) also comprises open loop protection circuit (106), and said open loop protection circuit (106) connects said half-bridge resonance DC/DC converter control circuit (103).
8. like any described constant-current driving power supply that is used for the LED illumination in the claim 1 to 5; Wherein said control loop (2) also comprises thermal-shutdown circuit (107), and said temperature protective circuit (107) connects said half-bridge resonance DC/DC converter control circuit (103).
9. like any described constant-current driving power supply that is used for the LED illumination in the claim 1 to 5; Wherein said control loop (2) also comprises short-circuit protection circuit (108), and said short-circuit protection circuit (108) connects said half-bridge resonance DC/DC converter control circuit (103).
10. like any described constant-current driving power supply that is used for the LED illumination in the claim 1 to 5, wherein said accessory power supply (102) is respectively to said high power factor correction control circuit (101) and said half-bridge resonance DC/DC converter control circuit (103) power supply.
CN2011203168044U 2011-08-26 2011-08-26 Constant current driving power supply for illumination of Light Emitting Diode (LED) Expired - Fee Related CN202206616U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102625548A (en) * 2012-04-26 2012-08-01 重庆大学 Multi-output heavy-power LED constant-current drive power supply
CN102858064A (en) * 2012-08-29 2013-01-02 茂硕电源科技股份有限公司 LED (light emitting diode) centralized drive power parallel system
CN103631293A (en) * 2012-08-27 2014-03-12 上海占空比电子科技有限公司 Constant-current control circuit with power factor correction function and constant-current control method
CN103974497A (en) * 2013-02-05 2014-08-06 国钰电子(北海)有限公司 Light emitting diode driving system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102625548A (en) * 2012-04-26 2012-08-01 重庆大学 Multi-output heavy-power LED constant-current drive power supply
CN103631293A (en) * 2012-08-27 2014-03-12 上海占空比电子科技有限公司 Constant-current control circuit with power factor correction function and constant-current control method
CN103631293B (en) * 2012-08-27 2016-01-06 上海占空比电子科技有限公司 A kind of constant-current control circuit with power factor correction and method
CN102858064A (en) * 2012-08-29 2013-01-02 茂硕电源科技股份有限公司 LED (light emitting diode) centralized drive power parallel system
CN103974497A (en) * 2013-02-05 2014-08-06 国钰电子(北海)有限公司 Light emitting diode driving system

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20120425

Termination date: 20190826