CN107864529A - A kind of drive circuit - Google Patents
A kind of drive circuit Download PDFInfo
- Publication number
- CN107864529A CN107864529A CN201710818612.5A CN201710818612A CN107864529A CN 107864529 A CN107864529 A CN 107864529A CN 201710818612 A CN201710818612 A CN 201710818612A CN 107864529 A CN107864529 A CN 107864529A
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- Prior art keywords
- drive circuit
- diode
- switch
- load
- series connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The present invention provides a kind of drive circuit, is connected to a load.The drive circuit includes：One direct current supply node, a first switch and a second switch, one first rectifier, a transformer；And control circuit；Wherein, when connecting the drive circuit to drive the load, the load is in parallel with first rectifier, also, the load is connected by centre cap with the first switch between the powered by direct current node and earth point and second switch.
Description
Technical field
The present invention relates to LED driver field, more particularly to a kind of drive circuit.
Background technology
LED (light emitting diode) the drivers product similar with other generally has very small size limited to adapt to
Circuit free space.In this product, the part for taking large space is transformer and electrochemical capacitor.The circuit should also have
There is very high efficiency, produced with reduction due to small volume and be difficult to the heat eliminated.In former product, usually using huge
Big radiator and the large-scale shell for LED drive electronics, this make it that application of the lamp in such as pendent lamp is not sound feasible
Border.The lamp is the attractive in appearanceization substitute of standard tungsten bulb, however, because some components are because of elevated operating temperature and use
Some intrinsic unreliable components and cause these component failures so that expected bulb service life is significantly shorter than LED
The life expectancy of lamp.
The small-sized DC/DC converters used in LED driver are usually using flyback or buck topology structure, Fig. 1 institutes
What is shown is a conventional LED drive circuit.There is a D.C. magnetic biasing magnetic core 31 in the drive circuit.The DC/DC converters
Topological structure make it that transformer in circuit or inductor are limited by one using the D.C. magnetic biasing of big magnetic element.
It would therefore be desirable to a kind of new drive circuit, to solve the technical problem that presently, there are.
The content of the invention
It is an object of the invention to provide a kind of drive circuit, is caused suitable for driving LED and reduction by output transformer
Switching transistor on voltage stress.The drive circuit is push-pull type structure, and the structure is due to eliminating magnetic core of transformer
D.C. magnetic biasing, can reduce it is described output transformer size and can realize during a monolithic, junction isolation integrate only
It is required that the semiconductor devices of the circuit of DMOS low-pressure sides.
In order to achieve the above object, the present invention provides a kind of drive circuit, is connected to a load；The drive circuit bag
Include：One direct current supply node；One first switch and a second switch；One first rectifier；One transformer, the transformation utensil
There are one first armature winding, one second armature winding and a secondary windings；Wherein, first armature winding and second it is primary around
Group is respectively by the first switch and second switch, and first armature winding and the second armature winding have a center
Tap, the centre cap are connected to the powered by direct current node, also, described negative to drive connecting the drive circuit
During load, the secondary windings is connected to the load by first rectifier；And control circuit, the control circuit
It is connected to the first switch and second switch so that when driving the load, the first switch and second switch alternating
Conducting；Wherein, when connecting the drive circuit to drive the load, the load is in parallel with first rectifier, and
And the load passes through the centre cap, is opened with described first between the powered by direct current node and earth point
Close and second switch is connected.
In an embodiment of the present invention, when connecting the drive circuit to drive the load, the centre cap leads to
Cross the load and be connected to the powered by direct current node.
In an embodiment of the present invention, when connecting the drive circuit to drive the load, the first switch and
Second switch passes through the carrying ground.
In an embodiment of the present invention, the load is the LED of a LED or multiple series connection.
In an embodiment of the present invention, when the drive circuit drives the load, the electric current for flowing through the load is
Electric current from the secondary windings is with flowing into the centre tapped electric current sum.
In an embodiment of the present invention, first rectifier includes：One first electric capacity and one second electric capacity of series connection, its
In, the first electric capacity and the second electric capacity of the series connection have one first intermediate node, and first intermediate node is connected to described
One first end of secondary windings；And one first diode and one second diode of series connection, wherein, the first of the series connection
Diode and the second diode have one second intermediate node, and second intermediate node is connected to the one of the secondary windings
Two ends.
In an embodiment of the present invention, first diode and the second diode of series connection pass through one the 3rd capacitance connection
To second end of the secondary windings, to form a resonance circuit.
In an embodiment of the present invention, first rectifier includes：One first diode of series connection and one the 2nd 2 pole
Pipe, wherein, the first diode and the second diode of the series connection have one first intermediate node, and first intermediate node connects
It is connected to a first end of the secondary windings；And one the 3rd diode of series connection and one the 4th diode, wherein, the string
The first triode and the 4th diode of connection have one second intermediate node, second intermediate node be connected to the secondary around
One second end of group.
In an embodiment of the present invention, the drive circuit further comprises：One electric capacity, the electric capacity are described with connecting
First diode and the second diodes in parallel, also, the electric capacity and the 3rd diode and the 4th diode connected are simultaneously
Connection.
In an embodiment of the present invention, the 3rd diode and the 4th diode of series connection pass through one the 3rd capacitance connection
To second end of the secondary windings, to form a resonance circuit.
In an embodiment of the present invention, the drive circuit further comprises one second rectifier, second rectifier
It is connected between the powered by direct current node and earth point.
In an embodiment of the present invention, the first switch and the second switch are DMOS transistors.
In an embodiment of the present invention, the first switch and the second switch respectively with corresponding one first diode
With one second diodes in parallel and be grounded.
In an embodiment of the present invention, the control circuit is adjusted based on voltage.
In an embodiment of the present invention, the control circuit is adjusted based on electric current.
In an embodiment of the present invention, the centre cap passes through a capacity earth.
In an embodiment of the present invention, it is logical to be formed at one for the control circuit, the first switch and the second switch
In integrated circuit.
Brief description of the drawings
Shown in Fig. 1 is an existing LED drive circuit with D.C. magnetic biasing magnetic core；
Shown in Fig. 2 is the drive circuit of one embodiment of the invention；
Shown in Fig. 3 is computer simulation circuit；
Shown in Fig. 4 is the ripple of the voltage stress reduced on the DMOS switches of the drive circuit of one embodiment of the invention
Shape；
Shown in Fig. 5 and Fig. 6 is the drive circuit of another embodiment of the present invention.
Embodiment
Hereinafter, with reference to embodiment, the technology of the present invention is described in detail.It is appreciated that the various following tool
Body embodiment is only used for helping skilled in the art to understand the present invention, rather than limitation of the present invention.
The drive circuit being related to below is push-pull circuit, can be reduced as caused by output transformer in switching transistor
Voltage stress.Due to eliminating the D.C. magnetic biasing of magnetic core of transformer, the drive circuit being related to below can meet to reduce transformer
The requirement of size, the integration requirement of semiconductor subassembly in circuit can also be met.Can using the circuit embodiments of DMOS low-pressure sides
To be realized during monolithic, junction isolation.
Embodiment one
Fig. 2 is referred to, shown in Fig. 2 is the first embodiment of drive circuit of the present invention, is that a kind of small size is recommended
Formula LED drive circuit.
In the present embodiment, the drive circuit includes：One direct current supply node；One first switch and one second is opened
Close；One rectifier；One transformer T1 131；And control circuit 103.The drive circuit is used to drive a load 121.
In the present embodiment, the first switch and second switch are DMOS transistors, are designated as transistor M1 105 and crystalline substance
Body pipe M2 107.The powered by direct current node comes from the bridge rectifier that can be connected to an alternating-current voltage source, the friendship
Flow the public 115V of voltage source such as 220V AC powers.The load 121 is a LED string.
As shown in Figure 2, the transformer T1 131 has three windings：First armature winding 133, the second armature winding
135 and a secondary windings 137.The armature winding 135 of first armature winding 133 and second is respectively connecting to transistor M1 105
With transistor M2 107, centre cap is then connected to the powered by direct current node by the load；And the secondary windings
137 circuits for being connected to one by the rectifier to the load supplying.As shown in Figure 2, the load 121 and electric capacity
123 and electric capacity 125 it is in parallel, and the load 121 is also in parallel with diode 127 and diode 129, electric so as to form resonance
Road.The intermediate node of the electric capacity 123 and electric capacity 125 is connected to the p1 ends of the secondary windings 137, and the diode 127
And the intermediate node of diode 129 is connected to the n1 ends of the secondary windings 137 by an electric capacity 141.Then, the parallel line
Low-pressure side be grounded by one the 3rd electric capacity 143.
In this configuration, the transformer T1 131 does not have a D.C. magnetic biasing, also, load current be converter (including
Two the transistor M1 105 and transistor M2 107, transformer T1 131, a series reactor, output diode and electricity
Hold) output current and transformer T1 131 input current.Below in conjunction with Fig. 6, elaborate the load alternately by
It is positioned in the common source connection of the switch.
Due to the load 121 shown in Fig. 2 be connected to the positive supply of the transformer T1 131 and centre cap it
Between, the electric current into circuit will pass through the load 121 so that load current origin comes from the electricity of transformer secondary output winding 137
Flow and formed with entering the electric current sum of the transformer center tap.Transistor M1 105 and transistor as the switch
M2 107 is in parallel with a diode 115 and a diode 117 respectively.Certainly, by rationally designing the grid of the DMOS transistors
Pole driver' s timing, the diode 115 and diode 117 can be removed.Relative to other topologys used in the driving circuit
Structure, the configuration in Fig. 2 allow the DMOS transistors to have a breakdown voltage reduced.
Transistor M1 105 and transistor M2 107 alternate conduction as switch so that electric current is in transistor
M1105 flows through top 133 (p2, m2, winding) when turning on, and when transistor M2 107 is turned on electric current flow through bottom 135 (p3,
M3, winding).It is this exchange driving cause there is no D.C. magnetic biasing on the magnetic core of transformer 139, so as to make full use of from [-
Bm；- Hm] put to [+Bm；+ Hm] point magnetic core BH curve.This expanded application of the BH curve can cause transformer
Size is less than the half for being generally used for flyback or the transformer size of buck topology structure.
The drive circuit of the present embodiment has used resonant topology, and the resonant topology make use of transformer
Non-ideal between armature winding and secondary windings couples and reduces switching loss.By with the dc source and transformer
Load connection between heart tap, reduce switch (transistor M1 105 and transistor M2 107) drain voltage peak value.
As an embodiment, the direct current electricity output peak value that a 310V can be provided is inputted using a 220V alternating currents.Assuming that
Voltage as the LED string of load is 50V, then the centre cap only receives 260V voltages in the worst case, therefore,
The peak value of drain voltage is 520V.Certainly, the LED string can also have higher voltage (such as 100~150V) and can
To be used together with the input of 220V alternating currents, so as to using as the transistor M1 105 and transistor M2 107 of switch drain electrode electricity
Voltage crest value is reduced to about 300V.It is different from flyback converter, do not needed because resonance converter operation will not produce
Crest voltage, a common 700V BCD techniques be sufficient for one be used for 50VLED lamp strings single-chip microcomputer in include controller
103 and the one chip solution of two DMOS transistors, and a 400VBCD techniques are sufficient for a 150V LED strings will
Ask.
The load is connected on the maximum electricity for being easy to reduce on the DMOS transistors as switch with the direct current supply
The electric current for being supplied to the load is also enhanced while pressure.The load current has two current components, wherein, the first electric current
Component is the output of the resonance converter, and the second current component is then the supply current of the resonance converter.
Due to the features described above of circuit described in the present embodiment, the resonance converter only provides fractional load electric current, thus
The size of the transformer can be less than those transformer sizes that whole load currents must be obtained from resonance converter.Output
The diode 127 and diode 129 that side is configured using quasi- multiplication of voltage is employed, the quasi- multiplication of voltage configuration allow small-sized low using two
Potential electrolysis electric capacity 123 and electric capacity 125 are used as output filter.
In the present embodiment, 500nF electric capacity 143 provides low-impedance grounding path for high frequency electric, and reduces
Caused EMI (electromagnetic interference), meanwhile, the electric capacity 143 is also sufficiently small so that the drive circuit have high power because
Number.Due to not having high-voltage electrolytic capacitor in the drive circuit, also it is greatly improved while circuit size minimum is realized
Long-term reliability.According to the design of the control circuit 103, the topological structure described in the present embodiment can realize voltage and current
Regulation.
In the rectifier shown in Fig. 2, institute is turned on when the diode 127 is during the output signal is in positive and swung
State electric capacity 123 and the electric capacity 123 is charged, and the diode 129 is during the output signal is in negative and swung
When the electric capacity 125 is charged.This connected mode of the diode cause on the bottom plate of electric capacity 125 for negative electrical charge and
It is positive charge on the top plate of electric capacity 123.The electricity for the load being connected between the top plate of electric capacity 123 and the electric capacity 125 bottom plate
Press as two capacitance voltage sums.
As shown in Figure 2, the centre cap of the transformer T1 131 is connected to DC power supply simultaneously by the load
It is in parallel with the load, rectifier element 123,125,127 and 129；Also, the centre cap of the transformer T1 131 passes through
The armature winding 133,135 and the ground connection of switch 105,107.
Shown in Fig. 3 is the circuit diagram of the exemplary computer simulations available for one, and simulation is pushed away using transformer
Pull drives concept and supply current is flowed through the load to increase while the resonance converter power demand is reduced
The efficiency of the circuit and the voltage for reducing the DMOS transistors as switch.P1 and P2 is impulse generator, for driving
Dynamic transistor M1 and transistor M2 control gate, and control circuit 103 is replaced in Fig. 2 to carry out breadboardin.The load
It is the LED string of a 44V.The running frequency of circuit described in the present embodiment is 166.66kHz, and the running frequency is LED illumination
In conventional frequency.Carry out the R_ of accurate analog switch using 10 Ohmic resistances in each drain electrode of DMOS transistors as switch
on.The operating voltage of the drive circuit is 115V, 60Hz.The transformer has the E6.3 soft magnetic ferrite magnetic of a standard
Core, the magnetic core can be easily fitted into the standard small lamp socket of pendent lamp and many other stand alone types etc..
Drain voltage peak value is 229V, the drain voltage peaks demand as the DMOS transistors of switch breakdown voltage not
More than 300V, and allow on a semiconductor die using the transistor of very small area so that inexpensive integrated manipulator/open
Pass is possibly realized.Efficiency is 89.66%, and 0.5W heat is only produced under 5W output, so as to keep the low temperature of whole circuit.
The omission of low operating temperature and high-voltage electrolytic capacitor causes the service life in miniature base such as LED to extend.
Shown in Fig. 4 is the oscillogram measured on the DMOS transistor drains, the figure illustrates the circuit how
The BCD techniques of a relatively low voltage are used under lower peak voltages, to reduce the size of the DMOS transistors, and then are reduced
The cost of the control circuit/DMOS switch combinations.
It is of course also possible to there is several different modifications, Fig. 5 and shown in Fig. 6 be two of which embodiment.
Embodiment two
Fig. 5 is referred to, shown in Fig. 5 is another embodiment of drive circuit of the present invention.With the embodiment shown in Fig. 2
Similar, in the present embodiment, there is no direct current biasing on the magnetic core of transformer, and the input of the converter is gone here and there with output yet
Connection, so that load current is made up of the two components.
As shown in Figure 5, diode 153 and diode 155 in Fig. 5 instead of electric capacity 123 and the electric capacity shown in Fig. 2
125, and electric capacity 157 is then in parallel with the load.In the embodiment one shown in Fig. 2 and the embodiment two shown in Fig. 5, the change
The output of depressor is an ac signal, and the ac signal connects in the positive and negative interpolar swing relative to output end, the output end
It is connected to the tie point of electric capacity 123 and electric capacity 125 (Fig. 2) and the tie point of diode 153 and diode 155 (Fig. 5).Fig. 5's
In configuration, rectifier is served as using diode bridge so that the electric capacity 157 is swung during the positive swing of the output with negative
Period is all charged.
As shown in Figure 5, the centre cap of the transformer T1 131 is connected to DC power supply simultaneously by the load
It is in parallel with the load, rectifier element 127,129,153,155 and 157；Also, the centre cap of the transformer T1 131
It is grounded by the armature winding 133,135 and transistor M1 105, the transistor M2 107 of being used as switch.
Embodiment three
Fig. 6 is referred to, shown in Fig. 6 is another embodiment of drive circuit of the present invention.As shown in Figure 6, in Fig. 6
Use and Fig. 2 identical rectifier elements in shown drive circuit, and the rectifier element is in parallel with the load, but institute
That states rectifier element puts difference.As shown in Figure 6, similar to Fig. 2, the load passes through the transformer T1's 131
Centre cap and the transistor M1 105 and transistor M2 as switch between the DC power supply 101 and earth point
107 series connection；But the position of the load is changed.In figure 6, the DC power supply is connected to the center and taken out
Head, but without the load.The load (and rectifier element 123,125,127 and 129 in parallel) is located at as switch
Transistor M1 105 and transistor M2 107 source electrode and earth point between.Therefore, in Fig. 2 or Fig. 6 configuration, described turn
The input (centre cap of the transformer and public DMOS source terminals) of parallel operation and the load in series, only order is sent out for both
Changing.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only the example for implementing the present invention.
It must be noted that, it has been disclosed that embodiment be not limiting as the scope of the present invention.On the contrary, it is contained in the spirit of claims
And the modification of scope and impartial setting are included in the scope of the present invention.
Claims (17)
1. a kind of drive circuit, it is connected to a load, it is characterised in that the drive circuit includes：
One direct current supply node；
One first switch and a second switch；
One first rectifier；
One transformer, the transformer have one first armature winding, one second armature winding and a secondary windings；Wherein, institute
State the first armature winding and the second armature winding respectively by the first switch and second switch, and described first it is primary around
Group and the second armature winding have a centre cap, and the centre cap is connected to the powered by direct current node；Also, even
When connecing the drive circuit to drive the load, the secondary windings is connected to the load by first rectifier；
And
Control circuit, the control circuit are connected to the first switch and second switch so that when driving the load, institute
State first switch and second switch alternate conduction；
Wherein, when connecting the drive circuit to drive the load, the load is in parallel with first rectifier, and
And the load passes through the centre cap, is opened with described first between the powered by direct current node and earth point
Close and second switch is connected.
2. drive circuit as claimed in claim 1, it is characterised in that connecting the drive circuit to drive the load
When, the centre cap is connected to the powered by direct current node by the load.
3. drive circuit as claimed in claim 1, it is characterised in that connecting the drive circuit to drive the load
When, the first switch and second switch pass through the carrying ground.
4. drive circuit as claimed in claim 1, it is characterised in that the load is the LED of a LED or multiple series connection.
5. drive circuit as claimed in claim 1, it is characterised in that when the drive circuit drives the load, flow through
The electric current of the load is the electric current from the secondary windings with flowing into the centre tapped electric current sum.
6. drive circuit as claimed in claim 1, it is characterised in that first rectifier includes：
One first electric capacity and one second electric capacity of series connection, wherein, the first electric capacity and the second electric capacity of the series connection have one first
Intermediate node, first intermediate node are connected to a first end of the secondary windings；And
One first diode and one second diode of series connection, wherein, the first diode of the series connection and the second diode tool
There is one second intermediate node, second intermediate node is connected to one second end of the secondary windings.
7. drive circuit as claimed in claim 6, it is characterised in that first diode and the second diode of series connection lead to
One the 3rd capacitance connection is crossed to second end of the secondary windings, to form a resonance circuit.
8. drive circuit as claimed in claim 1, it is characterised in that first rectifier includes：
One first diode and one second diode of series connection, wherein, the first diode of the series connection and the second diode tool
There is one first intermediate node, first intermediate node is connected to a first end of the secondary windings；And
One the 3rd diode and one the 4th diode of series connection, wherein, the first triode of the series connection and the 4th diode tool
There is one second intermediate node, second intermediate node is connected to one second end of the secondary windings.
9. drive circuit as claimed in claim 8, it is characterised in that the drive circuit further comprises：
One electric capacity, the electric capacity and first diode and the second diodes in parallel connected, also, the electric capacity is with connecting
The 3rd diode and the 4th diodes in parallel.
10. drive circuit as claimed in claim 8, it is characterised in that the 3rd diode and the 4th diode of series connection
By second end of one the 3rd capacitance connection to the secondary windings, to form a resonance circuit.
11. drive circuit as claimed in claim 1, it is characterised in that the drive circuit further comprises one second rectification
Device, second rectifier are connected between the powered by direct current node and earth point.
12. drive circuit as claimed in claim 1, it is characterised in that the first switch and the second switch are DMOS
Transistor.
13. drive circuit as claimed in claim 1, it is characterised in that the first switch and the second switch respectively with
Corresponding one first diode and one second diodes in parallel are simultaneously grounded.
14. drive circuit as claimed in claim 1, it is characterised in that the control circuit is adjusted based on voltage.
15. drive circuit as claimed in claim 1, it is characterised in that the control circuit is adjusted based on electric current.
16. drive circuit as claimed in claim 1, it is characterised in that the centre cap passes through a capacity earth.
17. drive circuit as claimed in claim 1, it is characterised in that the control circuit, the first switch and described
Two switches are formed in a general integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818612.5A CN107864529A (en) | 2017-09-12 | 2017-09-12 | A kind of drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818612.5A CN107864529A (en) | 2017-09-12 | 2017-09-12 | A kind of drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107864529A true CN107864529A (en) | 2018-03-30 |
Family
ID=61699407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710818612.5A Pending CN107864529A (en) | 2017-09-12 | 2017-09-12 | A kind of drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107864529A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417931A (en) * | 2001-11-09 | 2003-05-14 | 台达电子工业股份有限公司 | Power supply device |
| CN102364862A (en) * | 2011-10-09 | 2012-02-29 | 电子科技大学 | AC/AC converter |
| US20160190939A1 (en) * | 2014-09-22 | 2016-06-30 | Joseph Pernyeszi | Push-Pull LED Driver Circuit |
-
2017
- 2017-09-12 CN CN201710818612.5A patent/CN107864529A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417931A (en) * | 2001-11-09 | 2003-05-14 | 台达电子工业股份有限公司 | Power supply device |
| CN102364862A (en) * | 2011-10-09 | 2012-02-29 | 电子科技大学 | AC/AC converter |
| US20160190939A1 (en) * | 2014-09-22 | 2016-06-30 | Joseph Pernyeszi | Push-Pull LED Driver Circuit |
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Application publication date: 20180330 |
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