CN201294664Y - High-efficiency LED lamp drive circuit - Google Patents
High-efficiency LED lamp drive circuit Download PDFInfo
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- CN201294664Y CN201294664Y CNU2008202124719U CN200820212471U CN201294664Y CN 201294664 Y CN201294664 Y CN 201294664Y CN U2008202124719 U CNU2008202124719 U CN U2008202124719U CN 200820212471 U CN200820212471 U CN 200820212471U CN 201294664 Y CN201294664 Y CN 201294664Y
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- led lamp
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- driving circuit
- lamp driving
- efficient led
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model is applicable to the road lighting techniques, and discloses a highly-effective LED lamp drive circuit which comprises a conversion unit which converts alternating current into direct current needed by the highly-effective LED lamp drive circuit through a zero-voltage soft on-off circuit, a control unit which is connected with the conversion unit, and is used for generating control signals for controlling the work of the highly-effective LED lamp drive circuit, and a constant-current unit which is connected with the control unit and the conversion unit, works according to the control signals, and outputs current. The voltage matched with the voltage needed by the highly-effective LED lamp drive circuit can be generated through the conversion unit, and simultaneously the zero-voltage soft on-off circuit in the conversion unit can reduce the wastage of electric energy, thereby improving electric efficiency of the LED lamp drive circuit, realizing power economy, and simultaneously improving the stability of the LED lamp drive circuit.
Description
Technical field
The utility model relates to the road lighting technical field, and particularly a kind of high-efficiency LED light fixture moves circuit.
Background technology
Along with the development of LED technology, high-power, high-efficiency LED has appearred, and use the road lighting of street lamp application of LED to become a kind of trend in the city.Though adopt LED as the street lamp luminous element, can be used for road lighting, but existing LED street lamp is mainly by forcing power switch pipe to open when the non-vanishing volt of voltage or electric current turn-offs when non-vanishing, the loss of power switch pipe in switching process that is under this state is big, and this loss increases along with the increase of reverse frequency and power, the switching device temperature rise, influence the stability of Switching Power Supply, and conversion efficiency also can't further improve, can only reach about 85%, can't satisfy energy-conservation requirement.
Therefore need to improve the electrical efficiency of LED street lamp, satisfy saves energy, the requirement that can improve the stability of LED street lamp simultaneously.
The utility model content
The technical problem that the utility model mainly solves provides a kind of efficient LED lamp driving circuit, and this LED lamp driving circuit can improve electrical efficiency, and saves energy improves the stability of LED lamp driving circuit simultaneously.
In order to address the above problem, the utility model provides a kind of efficient LED lamp driving circuit, and this drive circuit comprises: converting unit converts alternating current to direct current that described efficient LED lamp driving circuit needs by the Zero-voltage soft switch circuit; Control unit is connected with described converting unit, is used to produce control signal, and described efficient LED lamp driving circuit is controlled; The constant current unit is connected with converting unit with described control unit, carries out work, output current according to control signal.
Preferably, described control unit comprises controller, time control unit, temperature conditioning unit and optical control element, and wherein, the time control unit is connected with described controller, according to the time output time control signal that is provided with; Temperature conditioning unit is connected with described control device, the temperature when being used to gather described efficient LED lamp driving circuit work, and export corresponding temperature control signals according to this temperature; Optical control element is connected with described controller, is used to gather brightness, and according to the corresponding optical control signal of the strong and weak output of this brightness; Controller is handled the output control signal corresponding to the signal of time control unit, temperature conditioning unit and optical control element input.
Preferably, described control signal is PWM.
Preferably, described Zero-voltage soft switch circuit comprises, transformer, first switching tube, second switch pipe, rectifier diode and active-clamp electric capacity, wherein, connect active clamping capacitance at primary one end, this active-clamp electric capacity is connected with the drain electrode of first switching tube, and the source electrode of first switching tube is connected with the other end of primary, the source electrode of described first switching tube is connected with the drain electrode of second switch pipe, the source ground of this second switch pipe; Be provided with rectifier diode at transformer secondary output one end.
Preferably, described transformer secondary output two ends also are provided with commutation capacitor.
Preferably, described first switching tube and second switch pipe are respectively metal-oxide-semiconductor.
Preferably, described transformer is the inverse-excitation type transformer.
The utility model efficient LED lamp driving circuit, convert alternating current to direct current that the LED lamp driving circuit needs by converting unit, and control the constant current unit by control unit and export the continuous current of controlling luminescence unit work, carry out luminous work by luminescence unit according to continuous current again.Because converting unit adopts the Zero-voltage soft switch circuit, the loss of efficient LED lamp driving circuit can be reduced, thereby the electrical efficiency of LED lamp driving circuit can be improved, realize saves energy, improve the stability of LED lamp driving circuit simultaneously.
Description of drawings
Fig. 1 is the theory structure schematic block diagram of the utility model efficient LED lamp driving circuit embodiment;
Fig. 2 is the control unit structural representation block diagram among the utility model efficient LED lamp driving circuit embodiment;
Fig. 3 is the Zero-voltage soft switch circuit diagram among the utility model efficient LED lamp driving circuit embodiment.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
The utility model efficient LED lamp driving circuit, convert alternating current to direct current that the LED lamp driving circuit needs by converting unit, and control the constant current unit by control unit and export the continuous current of controlling luminescence unit work, carry out luminous work by luminescence unit according to continuous current again.Because converting unit adopts the Zero-voltage soft switch circuit, the loss of LED lamp driving circuit can be reduced, thereby the electrical efficiency of LED lamp driving circuit can be improved, realize saves energy, improve the stability of LED lamp driving circuit simultaneously.
As shown in Figure 1, the utility model efficient LED lamp driving circuit one embodiment, this efficient LED lamp driving circuit comprises: converting unit 1 is used for alternating current is converted to the direct current of described efficient LED lamp driving circuit needs; Control unit 2 is connected with described converting unit 1, is used to produce the control signal of the described efficient LED lamp driving circuit of control work; Constant current unit 3 is connected with converting unit 1 with described control unit 2, carries out work, output current according to the control signal of described control unit 2 outputs; Luminescence unit 4 is connected with described constant current unit 3, and the electric current of exporting according to constant current unit 3 carries out work.
As shown in Figure 2, described control unit 2 comprises controller 21, time control unit 22, temperature conditioning unit 23 and optical control element 24.Wherein, described time control unit 22 is connected with controller 21, according to the time output time control signal that is provided with; Described temperature conditioning unit 23 is connected with described control device 21, the temperature when being used to gather described efficient LED lamp driving circuit work, and export corresponding temperature control signals according to this temperature.Temperature when wherein, the temperature the during work of described efficient LED lamp driving circuit is described luminescence unit 4 work; Described optical control element 24 is connected with controller 21, is used to gather brightness, and exports corresponding optical control signal according to the power of this brightness; The signal of 21 pairs of time control unit 22 of described controller, temperature conditioning unit 23 and optical control element 24 inputs is handled, and according to the time that is provided with, temperature and brightness parameter area output control signal corresponding, this control signal can be controlled described constant current unit 3 output currents, drives described luminescence unit 4 work.
For example, the time parameter scope when setting is: 04:00～6:00; During 19:00～23:00, luminescence unit 4 work, in the time of outside this parameter area, luminescence unit 4 quits work; When the timing time of time control unit 22 is in above-mentioned scope, described time control unit 22 output time control signals, 21 pairs of these time control signals of described controller are handled, the output control signal is given constant current unit 3, this moment, control signal can be controlled the electric current of 3 outputs of constant current unit and luminescence unit 3 couplings, thus 4 work of driven for emitting lights unit.When the timing time of time control unit 22 is not in above-mentioned scope, described time control unit 22 output time control signals are given controller 21,21 pairs of time control signals of this controller are handled, the output control signal is given constant current unit 3, control signal can be controlled constant current unit 3 and stopped to luminescence unit 4 output currents this moment, thereby luminescence unit 4 is quit work.
When the temperature parameter scope that is provided with during less than 80C °, luminescence unit 4 operate as normal, promptly luminescence unit 4 carries out work according to its rated power.The temperature that this moment, warm unit 23 was gathered luminescence unit 4 in real time, and will be to controller 21 input temp control signals, 21 pairs of these temperature control signals of described controller are handled, and output control signal, this moment, this control signal can be controlled constant current unit 3 output currents, the electric current of this electric current during with luminescence unit 4 rated power is identical, so luminescence unit 4 can operate as normal.When temperature during more than or equal to 80C °, described luminescence unit 4 is in non-normal working, and promptly luminescence unit 4 does not reach its rated power and carries out work.Described temperature conditioning unit 23 output temperature control signals are given controller 21, these controller 21 output temperature control signals, this control signal can be controlled constant current unit 3 to luminescence unit 4 input currents, electric current when this moment, this electric current was less than luminescence unit 4 rated power, therefore these luminescence unit 4 power outputs diminish, the temperature of luminescence unit 4 also can reduce, up to the temperature of luminescence unit 4 during less than 80C °, described luminescence unit 4 recovers operate as normal, and the electric current when promptly constant current unit 3 output currents are with luminescence unit 4 rated power equates.
When the brightness parameter is located at a certain scope, described luminescence unit 4 work.Then the brightness of optical control element 24 collections is when above-mentioned scope, described optical control element 24 output optical control signals, handle by 21 pairs of these optical control signals of controller, the output control signal is given constant current unit 3, this moment, control signal can be controlled described constant current unit 3 to luminescence unit 4 output currents, therefore described luminescence unit 4 work; When brightness is not in the scope in above-mentioned setting, described optical control element 24 output optical control signals, handle by 21 pairs of these optical control signals of controller, the output control signal is given constant current unit 3, control signal can be controlled described constant current unit 3 and stopped output current to luminescence unit 4 this moment, so luminescence unit 4 stops.
In the above-described embodiments, as required parameter is provided with, and is stored in the described controller 21.
As shown in Figure 3, described converting unit 1 comprises the Zero-voltage soft switch circuit, and this soft switch circuit comprises, transformer T, the first switching tube S1, second switch pipe S2, rectifier diode D and active-clamp capacitor C 1.Wherein, elementary end at transformer T connects active clamping capacitance C1, this active-clamp capacitor C 1 is connected with the drain electrode of the first switching tube S1, the elementary other end of the source electrode of the described first switching tube S1 and transformer T is connected, the source electrode of the described first switching tube S1 is connected with the drain electrode of second switch pipe S2, the source ground of this second switch pipe S2, the grid of first switching tube 21 and second switch pipe S2 are connected with the circuit of control first switching tube 21 with second switch pipe S2 work respectively; Input voltage Vcc is from input between active-clamp capacitor C 1 and transformer T elementary; Be provided with rectifier diode D at T level of transformer one end, the negative electrode of this rectification diode D is exported V as positive voltage
O+, the secondary other end of transformer T is exported V as negative voltage
O-.Secondary two ends at transformer T can also be provided with commutation capacitor C2, and this commutation capacitor C2 can carry out rectifying and wave-filtering to output voltage.
In order more to clearly demonstrate the soft switch circuit in the converting unit 1, specify the soft switch circuit course of work:
In the phase I: be made as t1, the first switching tube S1 conducting, second switch pipe S2 turn-offs, and rectifier diode D bears reverse voltage.Second switch pipe S2 endoparasitism diode is reverse bias also.Electric current on the elementary magnetizing inductance of transformer T rises in the effect lower linear of Vcc.When selecting, to select suitable voltage and current tolerance.
In second stage: be made as t2, the first switching tube S1 turn-offs.The leakage inductance of magnetizing inductance that transformer T is elementary and transformer T is carried out resonance with the junction capacitance on the second switch pipe S2 together, utilizes exciting curent (this moment, exciting curent equated with the electric current that flows through leakage inductance) to charge to junction capacitance.Second switch pipe S2 is in off state, and the parasitic diode in the second switch pipe S2 continues reverse bias.
Phase III: be made as t3, the junction capacitance on second switch pipe S2 is recharged, up to this knot
Voltage Vc1 when capacitance voltage reaches input voltage Vcc and active-clamp capacitor C 1 steady operation it
With, at this moment, the parasitic diode on the second switch pipe S2 begins conducting, and the leakage inductance of magnetizing inductance that transformer T is elementary and transformer T constitutes resonant tank with active-clamp capacitor C 1, carry out resonance, and utilize exciting curent to charge to the junction capacitance on the second switch pipe S2.Because the junction capacitance of active-clamp capacitor C 1 on the second switch pipe S2, therefore nearly all exciting curent all flows to active-clamp capacitor C 1, magnetizing inductance that while transformer T is elementary and the leakage inductance of transformer T are carried out dividing potential drop, and this moment, exciting voltage was a transformer T primary voltage.
Quadravalence section: be made as t4, filtered diode D forward conduction.The primary voltage of transformer T just
Be clamped at nVo by active-clamp capacitor C 1, wherein, Vo is an output voltage, and n is a setting coefficient.
At this moment, the leakage inductance of transformer T and active-clamp capacitor C 1 constitute resonant tank, carry out resonance.Utilize exciting curent to charge to the junction capacitance on the second switch pipe S2.For the ZVS (Zero-Voltage switch, Zero-voltage soft switch) that can realize second switch pipe S2, second switch pipe S2 must resonance current oppositely before triggering and conducting.
Five-stage: be made as t5, second switch pipe S2 turn-offs, and makes that the junction capacitance on the second switch pipe S2 is promptly opened from circuit interruption.Simultaneously, the leakage inductance of transformer T and junction capacitance are carried out resonance, and the primary voltage on the transformer T still is clamped at nVo by active-clamp capacitor C 1.When the electric current on the leakage inductance of transformer T was equal to electric current on the elementary magnetizing inductance of transformer T, secondary current reduced to zero, filtered diode D oppositely by, the voltage on transformer T is elementary begins oppositely.
The 6th stage: be made as t6, be stored in energy on the leakage inductance of elementary magnetizing inductance of transformer T and transformer T greater than the energy that is stored on the junction capacitance, when the electric charge on the active clamping capacitance C1 will have been put, filtered diode D began conducting; If the first switching tube S1 conducting that is triggered then just can realize ZVS in this time period.Simultaneously, for elementary magnetizing inductance of transformer T and the leakage inductance of transformer T, the voltage at two ends is Vcc, and the electric current on the magnetizing inductance begins linear the rising again.At t6 constantly, the first switching tube S1 conducting enters next switch cycle period.
This circuit is just by allowing the anti exciting converter T of active-clamp be operated under the inductive current on-off state, utilize the elementary magnetizing inductance of transformer T to participate in the resonance of circuit, before the first switching tube S1 conducting, energy on the elementary magnetizing inductance of transformer T arrives zero with the junction capacitance voltage resonance on the second switch pipe S2, realize the ZVS of circuit, thereby improve the efficient of Switching Power Supply.
In above-mentioned enforcement, constant current unit 3 adopts voltage-dropping type constant current IC to drive, as LM3402, the LM3402HV etc. of National Semiconductor.Can establish a plurality of constant currents unit 3 as required, every constant current unit 3 drives one group of luminous element.By adjusting converting unit 1, can provide the suitable one or more constant currents of output voltage unit 3.For example, if when driving one group of luminous element forming by 15 great power LEDs, the voltage power supply of each LED is 3.2V, then 15 LED operating voltages should be 48V, converting unit 1 output voltage can be adjusted into about 51V so, making on each constant current unit 3 all has suitable voltage drop, thereby can make constant current unit 3 reach higher operating efficiency, and the most effective of this constant current unit 3 reaches 97%.
In the above-described embodiments, the control signal of described control unit 2 or controller 21 outputs is PWM (Pulse Width Modulation, pulse width modulation); Described first switching tube S1 and second switch pipe S2 are metal-oxide-semiconductor, also can be for other switching devices, as triode; Described transformer T is the inverse-excitation type transformer.
The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. an efficient LED lamp driving circuit is characterized in that, described drive circuit comprises:
Converting unit converts alternating current to direct current that described efficient LED lamp driving circuit needs by the Zero-voltage soft switch circuit;
Control unit is connected with described converting unit, is used to produce the control signal of the described efficient LED lamp driving circuit of control work;
The constant current unit is connected with converting unit with described control unit, carries out work, output current according to control signal.
2. a kind of efficient LED lamp driving circuit according to claim 1 is characterized in that: described control unit comprises controller, time control unit, temperature conditioning unit and optical control element, wherein,
The time control unit is connected with described controller, according to the time output time control signal that is provided with;
Temperature conditioning unit is connected with described control device, the temperature when being used to gather described efficient LED lamp driving circuit work, and export corresponding temperature control signals according to this temperature;
Optical control element is connected with described controller, is used to gather brightness, and according to the corresponding optical control signal of the strong and weak output of this brightness;
Controller is handled the output control signal corresponding to the signal of time control unit, temperature conditioning unit and optical control element input.
3. a kind of efficient LED lamp driving circuit according to claim 1 and 2 is characterized in that: described control signal is PWM.
4. a kind of efficient LED lamp driving circuit according to claim 1 and 2, it is characterized in that: described Zero-voltage soft switch circuit comprises, transformer, first switching tube, second switch pipe, rectifier diode and active-clamp electric capacity, wherein, connect active clamping capacitance at primary one end, this active-clamp electric capacity is connected with the drain electrode of first switching tube, the source electrode of first switching tube is connected with the other end of primary, the source electrode of described first switching tube is connected with the drain electrode of second switch pipe, the source ground of this second switch pipe; Be provided with rectifier diode at transformer secondary output one end.
5. a kind of efficient LED lamp driving circuit according to claim 4 is characterized in that: described transformer secondary output two ends also are provided with commutation capacitor.
6. a kind of efficient LED lamp driving circuit according to claim 4 is characterized in that: described first switching tube and second switch pipe are respectively metal-oxide-semiconductor.
7. a kind of efficient LED lamp driving circuit according to claim 4 is characterized in that: described transformer T is the inverse-excitation type transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202124719U CN201294664Y (en) | 2008-10-21 | 2008-10-21 | High-efficiency LED lamp drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202124719U CN201294664Y (en) | 2008-10-21 | 2008-10-21 | High-efficiency LED lamp drive circuit |
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| CN201294664Y true CN201294664Y (en) | 2009-08-19 |
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| CNU2008202124719U Expired - Fee Related CN201294664Y (en) | 2008-10-21 | 2008-10-21 | High-efficiency LED lamp drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN103407409A (en) * | 2013-08-23 | 2013-11-27 | 宁波市富来电子科技有限公司 | Constant current driving control system for rear view mirror steering lamp |
-
2008
- 2008-10-21 CN CNU2008202124719U patent/CN201294664Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN101925230B (en) * | 2010-07-29 | 2012-12-26 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN103407409A (en) * | 2013-08-23 | 2013-11-27 | 宁波市富来电子科技有限公司 | Constant current driving control system for rear view mirror steering lamp |
| CN103407409B (en) * | 2013-08-23 | 2015-11-18 | 宁波市富来电子科技有限公司 | A kind of back mirror steering indicating light constant current driving control system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20171021 |