CN204069450U - A kind of multiple-channel output height step-down LED constant current driving power - Google Patents

A kind of multiple-channel output height step-down LED constant current driving power Download PDF

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Publication number
CN204069450U
CN204069450U CN201420557418.8U CN201420557418U CN204069450U CN 204069450 U CN204069450 U CN 204069450U CN 201420557418 U CN201420557418 U CN 201420557418U CN 204069450 U CN204069450 U CN 204069450U
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China
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group
light source
negative electrode
led light
power switch
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CN201420557418.8U
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邾玢鑫
杨玉良
黄悦华
王辉
刘义平
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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

A kind of multiple-channel output height step-down LED constant current driving power, comprises n power switch: S 1, S 2, S 3s n; N diode: D 1, D 2, D 3d n; N-1 electric capacity C 1, C 2c n-1; N inductance L 1, L 2, L 3l n.First power switch S 1the positive pole of input termination input DC power, the first power switch S 1output connect the first diode D 1negative electrode and the first inductance L 1one end; First inductance L 1the anode of another termination first group of LED light source, the negative electrode of first group of LED light source and the first diode D 1anode be connected; The first electric capacity C is connected with between the negative electrode of first group of LED light source and the negative pole of high step-down constant-current circuit 1, the first electric capacity C 1one end be connected with the negative electrode of first group of LED light source, the first electric capacity C 1the other end connect the negative pole of high step-down constant-current circuit.The utility model driving power, has multiple-channel output ability, simultaneously for multi-way LED lamp group is powered, only can be needed detection one road load current, reduce cost by a converter.

Description

A kind of multiple-channel output height step-down LED constant current driving power
Technical field
The utility model relates to one and relates to LED drive power, particularly a kind of multiple-channel output height step-down LED constant current driving power.
Background technology
Compared to traditional lighting light fixture, LED illumination has efficiently, the advantage such as energy-saving and environmental protection and long-life.Therefore, its application in real life also gets more and more.The power of current single LEDs, generally at below 3W, when using as lighting, is generally carry out in the mode of many series connection.But due to integrity problem, its series connection number can not be too much, so the form generally adopting connection in series-parallel to combine in high-power illumination occasion.In this case how much organize the LED drive power that LED light source just needs respective numbers, add its application cost.In addition, due to harmonic wave and power factor restriction, LED drive power is generally divided into 2 parts, and prime is PFC, and rear class is constant-current source.PFC output voltage is usually at more than 400V, and therefore, a lot of LED drive power rear class constant-current source part, adopts high frequency transformer link or multistage DC/DC step-down, and such driving power is too complicated and cost is also higher.
Summary of the invention
Technical problem to be solved in the utility model is, for existing high-power LED illumination field, its driver number is many, complex structure and, the problem such as cost is high, volume is larger, there is provided that a kind of step-down ability is strong, cost is low, volume is little and have the multiple-channel output height step-down LED constant current driving power of multiple-channel output ability.
The technical scheme that the utility model is taked is: a kind of multiple-channel output height step-down LED constant current driving power, comprises n power switch: S 1, S 2, S 3s n; N diode: D 1, D 2, D 3d n; N-1 electric capacity C 1, C 2c n-1; N inductance L 1, L 2, L 3l n.First power switch S 1the positive pole of input termination input DC power, the first power switch S 1output connect the first diode D 1negative electrode and the first inductance L 1one end; First inductance L 1the anode of another termination first group of LED light source, the negative electrode of first group of LED light source and the first diode D 1anode be connected; The first electric capacity C is connected with between the negative electrode of first group of LED light source and the negative pole of high step-down constant-current circuit 1, the first electric capacity C 1one end be connected with the negative electrode of first group of LED light source, the first electric capacity C 1the other end connect the negative pole of high step-down constant-current circuit.
The negative electrode of first group of LED light source connects the input of the second power switch S2, the output of the second power switch S2 connects the negative electrode of the second diode D2 and one end of the second inductance L 2, the other end of the second inductance L 2 connects the anode of second group of LED light source, and the negative electrode of second group of LED light source is connected with the anode of the second diode D2; The second electric capacity C is connected with between the negative electrode of second group of LED light source and the negative pole of high step-down constant-current circuit 2, the second electric capacity C 2one end be connected with the negative electrode of second group of LED light source, the second electric capacity C 2the other end connect the negative pole of high step-down constant-current circuit;
By that analogy, at negative electrode, the (n-1)th diode D of (n-1)th group of LED light source n-1anode and the (n-1)th electric capacity C n-1the Node connectedness n-th power switch S of one end ninput, the n-th power switch S noutput connect the n-th diode D nnegative electrode and the n-th inductance L none end, in the n-th inductance L nthe anode of another termination n-th group of LED light source, the negative electrode of n-th group of LED light source and the n-th diode D nanode be connected, this node is connected with the negative pole of high step-down constant-current circuit;
A described n power switch: S 1, S 2, S 3s ngrid connect respective controller respectively.
A described n power switch: S 1, S 2, S 3s ndrive singal there is identical duty ratio.
A described n power switch: S 1, S 2, S 3s nadopt MOSFET or IGBT.
Described first power switch S 1the positive pole of input DC power that connects of input, be the positive pole of the DC power supply that civil power obtains after PFC rectification circuit.
A described n diode: D 1, D 2, D 3d nfull-controlled switch device all can be adopted to replace.
A kind of multiple-channel output height step-down LED constant current driving power, the great power LED for general lighting field drives.
A kind of multiple-channel output height step-down LED constant current driving power, can work in synchronous regime or asynchronous mode.
Compared to existing technology, a kind of multiple-channel output height of the utility model step-down LED constant current driving power, has following beneficial effect:
1), there is high step-down ability, the efficient conversion of voltage between PFC output voltage to LED terminal voltage can be realized without the need to transformer; Circuit structure is simple, and output performance is good, and cost is low, and volume is little.
2), there is multiple-channel output ability, can simultaneously for multi-way LED lamp group be powered by a converter, and controller is simple, only needs detection one road load current, reduces cost.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the utility model.
Embodiment
As shown in Figure 1, a kind of multiple-channel output height of the utility model step-down LED constant current driving power, the great power LED being applied to general lighting field drives.This power source internal comprises two parts, and Part I is the PFC rectification circuit A that input is connected to grid side; Part II is DC/DC step-down constant current link, and the output of its step-down constant current link is connected to the two ends of LED light emitting source.Improvement link of the present utility model is the step-down constant current link of Part II.This link by having high step-down ability, the converter of multiple-channel output ability forms.Described converter input is the high pressure 400V direct current that PFC rectification exports, output multi-channel constant drive current.Each road drive current drives one group of LED illumination lamp.Can avoid like this connecting the problem of the poor reliability caused due to too much LED.
Embodiment 2: as shown in Figure 2, a kind of multiple-channel output height step-down LED constant current driving power, exports high step-down DC/DC constant-current circuit by PFC rectification circuit A with the new type multipath proposed and forms.Described multiple-channel output height step-down DC/DC constant-current circuit input is connected through the direct current of PFC rectification circuit A, output multi-channel constant drive current; Each road drives one group of LED illumination lamp; 3 power switchs S1, S2, S3 are comprised, 3 diodes D1, D2, D3,3 inductance L 1, L2, L3,2 electric capacity C1, C2 in described multiple-channel output height reduction voltage circuit; Wherein:
The positive pole of the input termination input DC power of the first power switch S1, export the negative electrode of termination first diode D1 and one end of the first inductance L 1, at the anode of another termination first group of LED light source m1 of the first inductance L 1, the negative electrode of first group of LED light source m1 is connected with the anode of the first diode D1, at the indirect first electric capacity C1 of the negative pole of this node and high step-down constant-current circuit, the positive pole of the first electric capacity C1 is connected with described node, and the negative pole of the first electric capacity C1 connects the negative pole of high step-down constant-current circuit.
At the negative electrode of first group of LED light source m1, the node of the anode of the first diode D1 and the positive pole of the first electric capacity C1 connects the input of the second power switch S2, the negative electrode of output termination second diode D2 of the second power switch S2 and one end of the second inductance L 2, at the anode of another termination second group of LED light source m2 of the second inductance L 2, the negative electrode of second group of LED light source m2 is connected with the anode of the second diode D2, at the indirect second electric capacity C2 of the negative pole of this node and high step-down constant-current circuit, the positive pole of the second electric capacity C2 is connected with described node, the negative pole of the second electric capacity C2 connects the negative pole of high step-down constant-current circuit.
The input of the 3rd power switch S3 is connect at the negative electrode of second group of LED light source m2, the anode of the second diode D2 and the second node holding C2 positive pole, the negative electrode of output termination the 3rd diode D3 of the 3rd power switch S3 and one end of the 3rd inductance L 3, at the anode of another termination the 3rd group of LED light source m3 of the 3rd inductance L 3, the negative electrode of the 3rd group of LED light source m3 is connected with the anode of the 3rd diode D3, and this node is connected with the negative pole of high step-down constant-current circuit.
A kind of multiple-channel output height of the utility model step-down LED constant current driving power, for the voltage stress of switching device contained in realizing circuit is equal, the duty ratio of its each power switch needs equal, but the conduction phase in unit switch periods does not do requirement.Therefore, both can work in synchronous regime, also can work in asynchronous mode.Only illustrate for synchronous regime below.According to the difference of on off state, circuit can be divided into 2 operating states:
(1), controller controls power switch S1, S2, S3 equal conducting, and the direct current of the 400V now provided by PFC rectification circuit A is that the first electric capacity C1 and the first inductance L 1 are charged by the first power switch S1, is that first group of LED group m1 powers simultaneously; First electric capacity C1 is that the second electric capacity C2 and the second inductance L 2 are charged by the second power switch S2, is that second group of LED group m2 powers simultaneously; Second electric capacity C2 is that the 3rd inductance L 3 is charged by the 3rd power switch S3, is that the 3rd group of LED group m3 powers simultaneously.
(2), controller controls power switch S1, S2, S3 and all turns off, and now inductance L 1, L2 and L3 are all by corresponding diode D1, D2 and D3 afterflow, are that the LED of each self-loop is powered simultaneously.
Known by circuit working state, under the control mode that each power switch drive singal is synchronous, the electric current flow through on electric capacity C1, C2 can be ignored, and therefore actual required capacitance will be very little, can no electrolytic capacitor be realized, improve useful life and the reliability of circuit further.
In embodiment of the present utility model, described power switch and described diode according to input direct-current busbar voltage in system and the concrete difference exporting way, and can select the switching device of different voltage stress.A described n power switch: S 1, S 2, S 3s nadopt the wholly-controled device such as MOSFET or IGBT.A described n diode: D 1, D 2, D 3d nfull-controlled switch device all can be adopted to replace.
Iref in Fig. 2 represents current reference signal, and S1, S2, S3 represent that control signal is transported on the control end of switch S 1, S2, S3 respectively.
the power switch that the utility model uses is switching device, and the open and close of power switch are under control of the controller, three above-mentioned road constant-current drive circuits, and the duty ratio being controlled three-phase power switch by controller is identical, and phase-triggered is consistent.Electric capacity is energy-storage travelling wave tube, switch triggering conducting or turn off can not precise synchronization time, store energy and transmit, power switch disconnects inductance and plays the effect of afterflow, powers to corresponding LED group.During concrete enforcement, each road constant-current drive circuit drives one group of LED group, can effectively avoid too much LED to connect the problem of the poor reliability caused.
Obviously, a kind of multiple-channel output height of the utility model step-down LED constant current driving power, in the specific implementation, only needs detection one road load current, can realize the constant current of multi-way LED lamp group luminous, control and realize all simple.To detect first via load in embodiment 2, practical application also can detect other road load and realize closed-loop control.
Embodiment 2 is only used to operation principle and sets forth simple, and have employed three tunnels and export high step-down constant current driver circuit for LED, in the application of reality, according to lighting power increase in demand constant-current drive circuit number, now can only need the duty ratio being changed power switch by controller.
Above-described embodiment of the present utility model, is only for the utility model example is described, and is not the restriction to execution mode of the present utility model.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here cannot give exhaustive to all execution modes.Every belong to the technical solution of the utility model the apparent change of amplifying out or variation be still in the row of protection range of the present utility model.

Claims (5)

1. a multiple-channel output height step-down LED constant current driving power, comprises n power switch: S 1, S 2, S 3s n;
N diode: D 1, D 2, D 3d n; N-1 electric capacity C 1, C 2c n-1; N inductance L 1, L 2, L 3l n;
It is characterized in that, the first power switch S 1the positive pole of input termination input DC power, the first power switch S 1output connect the first diode D 1negative electrode and the first inductance L 1one end; First inductance L 1the anode of another termination first group of LED light source (m1), the negative electrode of first group of LED light source (m1) and the first diode D 1anode be connected; The first electric capacity C is connected with between the negative electrode of first group of LED light source (m1) and the negative pole of high step-down constant-current circuit 1, the first electric capacity C 1one end be connected with the negative electrode of first group of LED light source (m1), the first electric capacity C 1the other end connect the negative pole of high step-down constant-current circuit;
The negative electrode of first group of LED light source (m1) connects the input of the second power switch S2, the output of the second power switch S2 connects the negative electrode of the second diode D2 and one end of the second inductance L 2, the other end of the second inductance L 2 connects the anode of second group of LED light source (m2), and the negative electrode of second group of LED light source (m2) is connected with the anode of the second diode D2; The second electric capacity C is connected with between the negative electrode of second group of LED light source (m2) and the negative pole of high step-down constant-current circuit 2, the second electric capacity C 2one end be connected with the negative electrode of second group of LED light source (m2), the second electric capacity C 2the other end connect the negative pole of high step-down constant-current circuit;
By that analogy, at negative electrode, the (n-1)th diode D of (n-1)th group of LED light source n-1anode and the (n-1)th electric capacity C n-1the Node connectedness n-th power switch S of one end ninput, the n-th power switch S noutput connect the n-th diode D nnegative electrode and the n-th inductance L none end, in the n-th inductance L nthe anode of another termination n-th group of LED light source (mn), the negative electrode of n-th group of LED light source (mn) and the n-th diode D nanode be connected, this node is connected with the negative pole of high step-down constant-current circuit;
A described n power switch: S 1, S 2, S 3s ngrid connect respective controller respectively.
2. a kind of multiple-channel output height step-down LED constant current driving power according to claim 1, is characterized in that, a described n power switch: S 1, S 2, S 3s ndrive singal there is identical duty ratio.
3. a kind of multiple-channel output height step-down LED constant current driving power according to claim 1, is characterized in that, a described n power switch: S 1, S 2, S 3s nadopt MOSFET or IGBT.
4. a kind of multiple-channel output height step-down LED constant current driving power according to claim 1, is characterized in that, described first power switch S 1the positive pole of input DC power that connects of input, be the positive pole of the DC power supply that civil power obtains after PFC rectification circuit (A).
5. a kind of multiple-channel output height step-down LED constant current driving power according to claim 1, is characterized in that, a described n diode: D 1, D 2, D 3d nfull-controlled switch device all can be adopted to replace.
CN201420557418.8U 2014-09-26 2014-09-26 A kind of multiple-channel output height step-down LED constant current driving power Withdrawn - After Issue CN204069450U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104219854A (en) * 2014-09-26 2014-12-17 三峡大学 Multiplexed output high-voltage-reduction LED constant-current driving power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104219854A (en) * 2014-09-26 2014-12-17 三峡大学 Multiplexed output high-voltage-reduction LED constant-current driving power supply

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AV01 Patent right actively abandoned

Granted publication date: 20141231

Effective date of abandoning: 20160615

C25 Abandonment of patent right or utility model to avoid double patenting