CN207022258U - A kind of two paths of LED of Buck topologys flows drive circuit - Google Patents

A kind of two paths of LED of Buck topologys flows drive circuit Download PDF

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Publication number
CN207022258U
CN207022258U CN201720928796.6U CN201720928796U CN207022258U CN 207022258 U CN207022258 U CN 207022258U CN 201720928796 U CN201720928796 U CN 201720928796U CN 207022258 U CN207022258 U CN 207022258U
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led
inductance
filter capacitor
paths
drive circuit
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劳裕锦
李道军
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ZHUZHOU MEGMEET ELECTRICAL CO Ltd
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ZHUZHOU MEGMEET ELECTRICAL CO Ltd
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Abstract

The utility model discloses a kind of two paths of LED of Buck topologys to flow drive circuit, the inductance core being connected to form using E and anti-E shape, two coils are wound on two side columns of magnetic core respectively, one end of two coils connects diode-isolated respectively, and the other end connects output filter capacitor and LED string respectively.The excitatory caused magnetic flux of two coil currents is set to be returned through center pillar with equidirectional by direction of winding.The center pillar of magnetic core opens appropriate air gap, the magnetic resistance of center pillar is much larger than the magnetic resistance of side column.The current uniform also stored while can realizing inductive energy storage using the characteristic of magnetic circuit exports into two-way, the dual-use function for making inductance reach energy storage and flow, so as to realize that LED stream drives.

Description

A kind of two paths of LED of Buck topologys flows drive circuit
[technical field]
Drive circuit field is the utility model is related to, more particularly to a kind of two paths of LED of Buck topologys flows drive circuit.
[background technology]
Two paths of LED lamp string is widely used in FPD at present as backlight.Backlight drive is used as using Buck topologys During circuit, the stream mode of main flow is to realize to flow or realize using active device using two independent Buck in industry at present Flow.Using two independent Buck stream mode, number of devices is added, is flowed as cost to realize using increasing cost 's;Using the stream mode of active device, active device assume responsibility for the voltage difference of LED string, add loss, be to sacrifice effect Rate is cost to realize what is flowed.
Above two mode is all unfavorable under the theme of current energy-conserving and environment-protective, therefore urgently utility model is a kind of Take into account cost, efficiency and the new of current sharing energy and flow drive circuit.
[utility model content]
The two paths of LED of Buck topologys for using at present flows the shortcomings that drive circuit cost is too high or efficiency is too low, The utility model uses following technical scheme.
A kind of two paths of LED of Buck topologys flows drive circuit, including input filter capacitor C1, power MOS pipe Q1, afterflow Diode D1, isolating diode D2, D3, energy storage and the inductance L1, output filter capacitor C2, C3 for flowing dual-use function;It is described defeated Enter filter capacitor C1 connections power MOS pipe Q1, power MOS pipe Q1 connection sustained diode 1, sustained diode 1 is with isolating two Pole pipe D2, D3 is connected, and inductance L1 is arranged between isolating diode D2, D3 and output filter capacitor C2, C3.
Wherein, the magnetic core that inductance L1 is connected to form using E and anti-E shape.
Wherein, including input filter capacitor C1, one termination input positive pole, the other end are grounded;Power MOS pipe Q1 D poles Input positive pole is connect, S poles are connected with the negative electrode of sustained diode 1, and G poles connect control signal;The negative electrode of sustained diode 1 and power MOS Pipe Q1 S poles connection, anode are connected to ground.
Wherein, isolating diode D2, D3, its anode are connected with the negative electrode of sustained diode 1, negative electrode respectively with inductance L1 Two windings origin or beginning connection;The one end of the end of inductance L1 two windings respectively with output filter capacitor C2, C3 is connected; Output filter capacitor C1, C2 other end are connected to ground.
Wherein, energy storage and flow the magnetic core that the inductance L1 of dual-use function is connected to form by E and anti-E shape, two around Group is wound on two side columns of inductance core respectively, and center pillar coiling and is not provided with appropriate air gap, two side columns around Group, negative electrode of the one end respectively with isolating diode D2, D3 are connected, and the other end connects with output filter capacitor C2, C3 one end respectively Connect.
Wherein, output filter capacitor C2, C3 one end connects LED string respectively, and the other end is connected to ground.
The beneficial effects of the utility model are:
By improving Buck circuits and its inductance, inductance is realized while energy storage and flow, so as to reach than with two Independent Buck realizes the mode lower cost for flowing driving, than realizing the higher effect of the mode for flowing driving with active device Rate.
[brief description of the drawings]
Fig. 1 is the existing circuit that driving is flowed using two independent Buck topological realizations LED.
Fig. 2 is existing to realize that LED flows the circuit of driving using active device.
Fig. 3 is that the two paths of LED for the Buck topologys that the utility model is implemented flows drive circuit.
Fig. 4 is that the two paths of LED for the Buck topologys that the utility model is implemented flows the mark explanation of drive circuit.
Fig. 5 is the inductance L1 structural representations that the utility model is implemented.
[embodiment]
In order that the technological means that the utility model is realized is clear, it is new that this practicality is expanded on further below in conjunction with the accompanying drawings Type.
The two paths of LED for the Buck topologys that the utility model is implemented flows the principle of drive circuit as shown in figure 3, including input Filter capacitor C1, power MOS pipe Q1, sustained diode 1, isolating diode D2, D3, energy storage and the inductance for flowing dual-use function L1, output filter capacitor C2, C3;Input filter capacitor C1 connections power MOS pipe Q1, the power MOS pipe Q1 connection afterflow two Pole pipe D1, sustained diode 1 are connected with isolating diode D2, D3, and inductance L1 is arranged on isolating diode D2, D3 and output filter Between ripple electric capacity C2, C3.
Wherein, the magnetic core that inductance L1 is connected to form using E and anti-E shape.
Wherein, the terminations of input filter capacitor C1 mono- input positive pole, other end ground connection.Power MOS pipe Q1 D poles are connecing input just Pole, S poles are connected with the negative electrode of sustained diode 1, and G poles connect control signal, the S poles of the negative electrode of sustained diode 1 and power MOS pipe Q1 Connection, anode are connected to ground.
Isolating diode D2, D3 anode are connected with the negative electrode of sustained diode 1, negative electrode two with inductance L1 respectively The origin or beginning connection of winding, the one end of the ends of inductance L1 two windings respectively with output filter capacitor C2, C3 be connecteds, and output is filtered Ripple electric capacity C2, C3 other end are connected to ground.
Energy storage and the inductance L1 for flowing dual-use function, two winding are wound on two side columns of inductance core respectively, Center pillar coiling and is not provided with appropriate air gap, the winding of two side columns, one end negative electrode with isolating diode D2, D3 respectively Connection, the one end of the other end respectively with output filter capacitor C2, C3 is connected.
Output filter capacitor C2, C3 one end connect LED string respectively, and the other end is connected to ground.
The operation principle of the utility model above example is as follows:
As shown in figure 3, be this example implemented Buck topology two paths of LED flow drive circuit.Inductance L1 uses EE shapes The magnetic core of shape, distinguishes the coil of the identical number of turn of coiling on two side columns of inductance core, and the number of turn is designated as N1, N2, magnetic core respectively Appropriate air gap is opened on center pillar.The magnetic flux for encouraging coil current by direction of winding is returned on center pillar with equidirectional.
When circuit works:
Two winding currents of inductance are designated as I1, I2 respectively
The magnetic flux of two winding currents excitation of inductance is designated as respectively
The magnetic flux of inductance core center pillar is designated as
The magnetic resistance of two side columns of inductance core is designated as R1, R2 respectively
The magnetic resistance of inductance core center pillar is designated as R
Had according to the law of magnetic circuit:
Because inductance core center pillar has opened air gap, center pillar magnetic resistance is much larger than side column magnetic resistance, therefore has:
R>>R1
R>>R2
And:
Again:N1=N2
=>I1 ≈ I2 (two windings export impartial to the electric current of LED string)
The utility model above example effectively can realize that stream drives to two paths of LED lamp string.
Drive circuit is flowed to a kind of two paths of LED provided by the utility model above to be described in detail.Herein The inductance for applying Buck topological sum EE magnetic cores composition is set forth to principle of the present utility model and embodiment.More than The explanation of embodiment is only intended to help and understands core concept of the present utility model, all to be made with core concept of the present utility model Equivalent change or modification, including using other topological sums such as Boost, Buck-Boos using the magnetic core with EE analogous shapes come Implement the core concept that the utility model is illustrated, belong to covering scope of the present utility model.

Claims (5)

1. a kind of two paths of LED of Buck topologys flows drive circuit, it is characterised in that including input filter capacitor C1, power MOS Pipe Q1, sustained diode 1, isolating diode D2, D3, energy storage and the inductance L1 for flowing dual-use function, output filter capacitor C2, C3;Input filter capacitor C1 connections power MOS pipe Q1, the power MOS pipe Q1 connection sustained diode 1, sustained diode 1 It is connected with isolating diode D2, D3, inductance L1 is arranged between isolating diode D2, D3 and output filter capacitor C2, C3.
2. a kind of two paths of LED of Buck topologys according to claim 1 flows drive circuit, it is characterised in that input filter The termination input positive poles of ripple electric capacity C1 mono-, other end ground connection, power MOS pipe Q1 D poles connect input positive pole, S poles and fly-wheel diode D1 negative electrodes connect, and G poles connect control signal, and the negative electrode of sustained diode 1 is connected with power MOS pipe Q1 S poles, and anode is connected to ground.
3. a kind of two paths of LED of Buck topologys according to claim 1 flows drive circuit, it is characterised in that isolation two The anode of pole pipe D2, D3 is connected with the negative electrode of sustained diode 1, isolating diode D2, D3 negative electrode respectively with inductance L1 two The origin or beginning connection of individual winding, the one end of the ends of inductance L1 two windings respectively with output filter capacitor C2, C3 be connecteds, output Filter capacitor C2, C3 other end are connected to ground.
4. a kind of two paths of LED of Buck topology according to claim 1 flows drive circuit, it is characterised in that energy storage and The magnetic core that the inductance L1 of dual-use function is connected to form by E and anti-E shape is flowed, two winding is wound on inductance core respectively Two side columns on, center pillar coiling and is not provided with air gap, the winding of two side columns, one end respectively with isolating diode D2, D3 negative electrode connection, the one end of the other end respectively with output filter capacitor C2, C3 is connected.
5. a kind of two paths of LED of Buck topologys according to claim 1 flows drive circuit, it is characterised in that output filter Ripple electric capacity C2, C3 one end connect LED string respectively, and the other end is connected to ground.
CN201720928796.6U 2017-07-28 2017-07-28 A kind of two paths of LED of Buck topologys flows drive circuit Active CN207022258U (en)

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CN201720928796.6U CN207022258U (en) 2017-07-28 2017-07-28 A kind of two paths of LED of Buck topologys flows drive circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107360648A (en) * 2017-07-28 2017-11-17 株洲麦格米特电气有限责任公司 A kind of two paths of LED of Buck topologys flows drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107360648A (en) * 2017-07-28 2017-11-17 株洲麦格米特电气有限责任公司 A kind of two paths of LED of Buck topologys flows drive circuit

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