CN106982495A - A kind of LED drive circuit and LED illumination System - Google Patents
A kind of LED drive circuit and LED illumination System Download PDFInfo
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- CN106982495A CN106982495A CN201710339588.7A CN201710339588A CN106982495A CN 106982495 A CN106982495 A CN 106982495A CN 201710339588 A CN201710339588 A CN 201710339588A CN 106982495 A CN106982495 A CN 106982495A
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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
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of LED drive circuit and LED illumination System, LED illumination System includes power supply, LED drive circuit includes inductance, switching tube, first electric capacity, second electric capacity, first diode and the second diode, the first end of inductance and the first end of power supply are connected, second end of inductance is connected with the first end of switching tube and the first end of the first electric capacity respectively, second end of switching tube and the second end of power supply are connected, second end of the first electric capacity is connected with the anode of the first diode and the negative electrode of the second diode respectively, the negative electrode of first diode is connected with the anode of the first LED modules, the anode of second diode is connected with the negative electrode of the 2nd LED modules, the negative electrode of first LED modules is connected with the anode of the 2nd LED modules, its common port is connected with the first end of the second electric capacity, second end of the second electric capacity and the second end of power supply are connected.Circuit structure of the present invention is simple and cost is low, and easily exploitation, is conducive to marketing.
Description
Technical field
The present invention relates to field of LED drive technology, more particularly to a kind of LED drive circuit and LED illumination System.
Background technology
The advantages of LED illumination System is because of its efficiency high, long lifespan, has become current illumination market and display screen market
Main product.Because being limited by factors such as its heat managements, the luminous power of single led monomer is limited, therefore, generally will be multiple
LED is monomer series-connected to meet actual brightness demand together.In order to ensure each monomer sends identical brightness, it is necessary to LED
Drive circuit, which has, ensures the function of all LED monomers Current compliances.
Current share scheme the simplest is to share an electric current together by all LED are monomer series-connected in the prior art,
But this can greatly reduce the reliability of system.Another popular scheme is by all monomers in LED illumination System
Be divided into after multiple series mould sets and again running each modules in parallel, this be accomplished by drive circuit have multi output, brightness-adjustable and
The function that many modules flow.At present, most drive circuits based on this scheme are all based on half-bridge or full bridge structure
So that drive circuit it is complicated, cost is high and development difficulty is big.
In addition, from a security standpoint, LED illumination System needs to have the function of input and output isolation, prior art
In be typically that isolating transformer is set between input and output, although can realize the purpose of isolation, but bulky transformation
Device increases the size of drive circuit and limits its appearance design.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art need solution at present
Problem.
The content of the invention
It is an object of the invention to provide a kind of LED drive circuit, circuit structure is simple and cost is low, easily exploitation, favorably
In marketing；Include the LED illumination System of above-mentioned LED drive circuit it is a further object of the present invention to provide a kind of.
In order to solve the above technical problems, the invention provides a kind of LED drive circuit, it is described applied to LED illumination System
LED illumination System includes power supply, and the LED drive circuit includes inductance, switching tube, the first electric capacity, the second electric capacity, the one or two pole
Pipe and the second diode, wherein：
The first end of the inductance is connected with the first end of the power supply, the second end of the inductance respectively with the switch
The first end of pipe and the connection of the first end of first electric capacity, the second end of the switching tube connects with the second end of the power supply
Connect, the second end of first electric capacity is connected with the anode of first diode and the negative electrode of second diode respectively,
The negative electrode of first diode is connected with the anode of the first LED modules, the anode and the 2nd LED modules of second diode
Negative electrode connection, the negative electrode of the first LED modules is connected with the anode of the 2nd LED modules, its common port and described the
The first end connection of two electric capacity, the second end of second electric capacity is connected with the second end of the power supply.
Preferably, the LED drive circuit also includes the 3rd electric capacity and the 4th electric capacity, the 3rd electric capacity and described first
LED modules in parallel, the 4th electric capacity and the 2nd LED modules in parallel.
Preferably, the LED drive circuit also includes the 3rd diode and the 4th diode, wherein：
The anode and the negative electrode of the first LED modules of the anode of 3rd diode respectively with second diode
Connection, the negative electrode of the 3rd diode connects with the first end of second electric capacity and the anode of the 4th diode respectively
Connect, the negative electrode of the 4th diode is connected with the anode of the 2nd LED modules.
Preferably, the LED drive circuit also includes the 3rd diode, the 4th diode, the 3rd LED modules and the 4th
LED modules, wherein：
Negative electrode, the moon of the 2nd LED modules of the anode of the 3rd LED modules respectively with the first LED modules
The negative electrode connection of pole and the 4th LED modules, the negative electrode of the 3rd LED modules connects with the anode of the 3rd diode
Connect, the negative electrode of the 3rd diode is connected with the first end of second electric capacity；The anode of the 4th LED modules with it is described
The negative electrode connection of 4th diode, the anode of the 4th diode is connected with the first end of second electric capacity.
Preferably, the LED drive circuit also includes the 5th electric capacity and the 6th electric capacity, wherein：
5th electric capacity and the 3rd LED modules in parallel, the 6th electric capacity and the 4th LED modules in parallel.
Preferably, the power supply is dc source, and the switching tube includes a NMOS or PMOS, correspondingly, described
NMOS drain electrode as the switching tube first end, the source electrode of the NMOS as the switching tube the second end；Or, institute
PMOS source electrode is stated as the first end of the switching tube, the drain electrode of the PMOS as the switching tube the second end.
Preferably, the power supply is AC power, and the switching tube includes NMOS or two of two differential concatenations instead
To the PMOS of series connection, correspondingly, first NMOS drain electrode as the switching tube first end, first NMOS source electrode with
Second NMOS source electrode connection, second NMOS drain electrode as the switching tube the second end；Or, first PMOS's
The first end drained as the switching tube, first PMOS source electrode is connected with second PMOS source electrode, second PMOS
Drain electrode as the switching tube the second end.
In order to solve the above technical problems, present invention also offers a kind of LED illumination System, including power supply, in addition to as above
State described LED drive circuit.
Preferably, the power supply is dc source or AC power.
The invention provides a kind of LED drive circuit and LED illumination System, LED illumination System includes power supply, LED drivings
Circuit includes inductance, switching tube, the first electric capacity, the second electric capacity, the first diode and the second diode, first end and the electricity of inductance
The first end connection in source, the second end of inductance is connected with the first end of switching tube and the first end of the first electric capacity respectively, switching tube
The second end and the second end of power supply connect, the anode and the second diode of the second end of the first electric capacity respectively with the first diode
Negative electrode connection, the negative electrode of the first diode is connected with the anode of the first LED modules, the anode of the second diode and the 2nd LED
The negative electrode connection of module, the negative electrode of the first LED modules is connected with the anode of the 2nd LED modules, its common port and the second electric capacity
First end is connected, and the second end of the second electric capacity and the second end of power supply are connected.
The present invention is realized by adjusting the energy that the conducting dutycycle i.e. adjustable source of switching tube is provided to LED modules
The regulation of LED luminance, and due to flowing into current integration of the current integration equal to the first capacitor of outflow of the first capacitor, so that
So that the average value for flowing through the electric current of LED modules is equal, the effect flowed has been reached, circuit structure of the present invention is simple and cost
Low, easily exploitation, is conducive to marketing.
In addition, passing through the first electric capacity and second between the input power side of LED drive circuit in the application and LED modules
Electric capacity carries out energy transmission, and electric charge is not directly through the two ends of the first electric capacity, and also no electric charge is directly through the second electric capacity
Two ends, therefore the LED drive circuit using the first electric capacity and the second electric capacity realize input power to output isolation, circuit
It is simple in construction and cost is low.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
A kind of structural representation for LED drive circuit that Fig. 1 provides for the present invention；
The structural representation for another LED drive circuit that Fig. 2 provides for the present invention；
The structural representation of LED drive circuit when Fig. 3 is AC power for the power supply that the present invention is provided；
Fig. 4 is a kind of operation mode schematic diagram of the LED drive circuit shown in Fig. 3；
Fig. 5 is another operation mode schematic diagram of the LED drive circuit shown in Fig. 3；
Fig. 6 is another operation mode schematic diagram of the LED drive circuit shown in Fig. 3；
Fig. 7 is another operation mode schematic diagram of the LED drive circuit shown in Fig. 3；
The structural representation for another LED drive circuit that Fig. 8 provides for the present invention；
The structural representation for another LED drive circuit that Fig. 9 provides for the present invention.
Embodiment
The core of the present invention is to provide a kind of LED drive circuit, and circuit structure is simple and cost is low, easily exploitation, favorably
In marketing；Include the LED illumination System of above-mentioned LED drive circuit it is a further object of the present invention to provide a kind of.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Referring to Fig.1 and 2, wherein, a kind of structural representation for LED drive circuit that Fig. 1 provides for the present invention, Fig. 2
The structural representation of another LED drive circuit provided for the present invention, the circuit is applied to LED illumination System, LED illumination system
System includes power supply, LED drive circuit including inductance L, switch transistor T, the first electric capacity C1, the second electric capacity C2, the first diode D1 and
Second diode D2, wherein：
Inductance L first end and the first end of power supply are connected, inductance L the second end respectively with the first end of switch transistor T and
First electric capacity C1 first end connection, the second end of switch transistor T and the second end of power supply are connected, the first electric capacity C1 the second end point
It is not connected with the first diode D1 anode and the second diode D2 negative electrode, the first diode D1 negative electrode and the first LED moulds
Group LED1 anode connection, the second diode D2 anode is connected with the negative electrode of the 2nd LED module LEDs 2, the first LED modules
LED1 negative electrode is connected with the anode of the 2nd LED module LEDs 2, and its common port is connected with the second electric capacity C2 first end, the second electricity
Hold C2 the second end and the second end of power supply is connected.
Specifically, the LED drive circuit that the present invention is provided includes inductance L, switch transistor T, the first electric capacity C1, the second electric capacity
C2, the first diode D1 and the second diode D2, it both can be that (the switch transistor T T in Fig. 1 and Fig. 2 is with NMOS (N-types such as Fig. 1
Mos field effect transistor) exemplified by) shown in circuit structure, or circuit structure as shown in Figure 2
(switch transistor T and inductance L position are interchangeable), can come which kind of circuit structure selected in actual applications as needed.
In addition, by the first electric capacity C1 and the between the input power side of LED drive circuit in the application and LED modules
Two electric capacity C2 carry out energy transmission, not electric charge directly through the first electric capacity C1 two ends, also without electric charge directly through the
Two electric capacity C2 two ends, therefore the LED drive circuit realizes input power to defeated using the first electric capacity C1 and the second electric capacity C2
The isolation gone out, circuit structure is simple and cost is low.
In addition, the power supply in LED illumination System can be dc source Vdc, or AC power Vac.
As a kind of preferred embodiment, power supply is dc source Vdc, and switch transistor T includes a NMOS or PMOS, phase
Ying Di, NMOS drain electrode as switch transistor T first end, NMOS source electrode as switch transistor T the second end；Or, PMOS's
Source electrode as switch transistor T first end, PMOS drain electrode as switch transistor T the second end.
The present invention does not do specific limitation for the type of metal-oxide-semiconductor, only need to meet the conducting dutycycle by adjusting switch transistor T
The energy that input power is provided by drive circuit to LED information display system can be adjusted.
As a kind of preferred embodiment, power supply is AC power Vac, and switch transistor T includes the NMOS of two differential concatenations
Or the PMOS of two differential concatenations, correspondingly, first NMOS drain electrode are used as the first end of switch transistor T, first NMOS
Source electrode be connected with second NMOS source electrode, second NMOS drain electrode as switch transistor T the second end；Or, first
PMOS drain electrode is as the first end of switch transistor T, and first PMOS source electrode is connected with second PMOS source electrode, second
PMOS drain electrode as switch transistor T the second end.
Specifically, Fig. 3 is refer to, the knot of LED drive circuit when Fig. 3 is AC power Vac for the power supply that the present invention is provided
Structure schematic diagram.
The present invention does not do specific limitation for the type of metal-oxide-semiconductor.In addition, the switching frequency of switch transistor T should be higher than that alternating current
Source Vac frequency, both LED brightness can be adjusted by the conducting dutycycle for adjusting switch transistor T, again can be to exchange
Power supply Vac power factor (PF) is adjusted.
Certainly, above-mentioned switch transistor T can also be IGBT (Insulated Gate Bipolar in addition to it can be metal-oxide-semiconductor
Transistor, insulated gate bipolar transistor) etc. other kinds of switch, the present invention be not particularly limited herein, according to
Actual conditions are determined.
As a kind of preferred embodiment, LED drive circuit also includes the 3rd electric capacity C3 and the 4th electric capacity C4, the 3rd electric capacity
C3 is in parallel with the first LED module LEDs 1, and the 4th electric capacity C4 is in parallel with the 2nd LED module LEDs 2.
Specifically, when LED drive circuit does not include the 3rd electric capacity C3 and the 4th electric capacity C4, the LED drive circuit can
The effect flowed is realized, but the first LED module LEDs 1 and the 2nd LED module LEDs 2 are intermittent high frequency light on and off, are driven when in LED
When the 3rd electric capacity C3 and the 4th electric capacity C4 is set in circuit, because electric capacity has the function that energy storage is filtered, in the first electric capacity C1 and
When second electric capacity C2 is not for the first LED module LEDs 1 or the power supply of the 2nd LED module LEDs 2, the 3rd electric capacity C3 and the 4th electric capacity C4
It still is able to power to correspondingly the first LED module LEDs 1 and the 2nd LED module LEDs 2, so that the He of the first LED module LEDs 1
2nd LED module LEDs 2 have lasting electric current to flow through.
The course of work to LED drive circuit by taking Fig. 3 as an example is described below：
Specifically, it refer to operation mode schematic diagrames of the Fig. 4-7, Fig. 4-7 for the LED drive circuit shown in Fig. 3.
On Fig. 4：
Because switch transistor T high frequency alternate run is between two states are turned on and off, in input ac power Vac just
Half cycle, when switch transistor T is opened, status circuit can be as shown in Figure 4.Input ac power Vac voltages are direct by switch transistor T
Charged to inductance L at the two ends for being applied to inductance L；First electric capacity C1 and the second electric capacity C2 connected by switch transistor T after again by the
Two diode D2 power to the 2nd LED module LEDs 2 and the 4th electric capacity C4；First diode D1 ends, and the 3rd electric capacity C3 gives first
LED module LEDs 1 are powered.
On Fig. 5：
In input ac power Vac positive half cycle, when switch transistor T is turned off, status circuit can be as shown in Figure 5.Input
AC power Vac voltages connected with inductance L after by the first diode D1 give the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity
C3 charges, while also being powered for the first LED module LEDs 1；Second diode D2 ends, and the 4th electric capacity C4 gives the 2nd LED modules
LED2 powers.
On Fig. 6：
In input ac power Vac negative half period, when switch transistor T is opened, status circuit can be as shown in Figure 6.Input
Charged to inductance L at the two ends that AC power Vac voltages are applied directly to inductance L by switch transistor T；The electricity of first electric capacity C1 and second
Hold and powered again by the first diode D1 to the first LED module LEDs 1 and the 3rd electric capacity C3 after C2 is connected by switch transistor T；Second
Diode D2 ends, and the 4th electric capacity C4 powers to the 2nd LED module LEDs 2.
On Fig. 7：
In input ac power Vac negative half period, when switch transistor T is turned off, status circuit can be as shown in Figure 7.Input
AC power Vac voltages connected with inductance L after by the second diode D2 give the first electric capacity C1, the second electric capacity C2 and the 4th electric capacity
C4 charges, while also being powered for the 2nd LED module LEDs 2；First diode D1 ends, and the 3rd electric capacity C3 gives the first LED modules
LED1 powers.
It is understood that when switch transistor T is opened, input ac power Vac instantaneous value is directly applied by switch transistor T
It is added to inductance L two ends and gives inductance L chargings, at the same time, the first electric capacity C1 and the second electric capacity C2 is passed through again after being connected by switch transistor T
Cross a diode to power to a LED module, now the first electric capacity C1 and the second electric capacity C2 is in discharge condition；Work as switching tube
When T is turned off, input ac power Vac powers after being connected with inductance L by another diode to another LED module, simultaneously
Also charged to the first electric capacity C1 and the second electric capacity C2.Under stable state, the energy that inductance L is filled with during switch transistor T is opened should
This is equal to the energy that inductance L discharges during switch transistor T is turned off, it is possible to adjusted by the conducting dutycycle for adjusting switch transistor T
The power of LED modules is transferred to from input ac power Vac, so as to reach the purpose of regulation LED luminance；Similarly, in switch
Pipe T is filled with the first electric capacity C1 and the second electric capacity C2 quantity of electric charge during turning off should open period from the first electricity equal to switch transistor T
Hold the quantity of electric charge of C1 and the second electric capacity C2 releases, it can thus be appreciated that two LED modules have identical average current.
It should be noted that when power supply is dc source Vdc, then its positive half cycle equivalent to input ac power Vac
Or negative half period, now the operation principle of LED drive circuit is as described above.
As a kind of preferred embodiment, LED drive circuit also includes the 3rd diode D3 and the 4th diode D4, its
In：
3rd diode D3 anode connects with the second diode D2 anode and the negative electrode of the first LED module LEDs 1 respectively
Connect, the 3rd diode D3 negative electrode is connected with the second electric capacity C2 first end and the 4th diode D4 anode respectively, the four or two
Pole pipe D4 negative electrode is connected with the anode of the 2nd LED module LEDs 2.
Specifically, Fig. 8, the structural representation for another LED drive circuit that Fig. 8 provides for the present invention be refer to.
As a kind of preferred embodiment, LED drive circuit also includes the 3rd diode D3, the 4th diode D4, the 3rd
The LED module LEDs 4 of LED module LEDs 3 and the 4th, wherein：
Negative electrode, the moon of the 2nd LED module LEDs 2 of the anode of 3rd LED module LEDs 3 respectively with the first LED module LEDs 1
The negative electrode connection of pole and the 4th LED module LEDs 4, the negative electrode of the 3rd LED module LEDs 3 is connected with the 3rd diode D3 anode,
3rd diode D3 negative electrode is connected with the second electric capacity C2 first end；The anode and the 4th diode of 4th LED module LEDs 4
D4 negative electrode connection, the 4th diode D4 anode is connected with the second electric capacity C2 first end.
The LED drive circuit that the present invention is provided can drive 4 paths of LEDs drive circuits, as shown in figure 9, Fig. 9 carries for the present invention
The structural representation of another LED drive circuit supplied.
As a kind of preferred embodiment, LED drive circuit also includes the 5th electric capacity C5 and the 6th electric capacity C6, wherein：
5th electric capacity C5 and the 3rd LED module LEDs 3 are in parallel, and the 6th electric capacity C6 and the 4th LED module LEDs 4 are in parallel.
Specifically, here the 5th electric capacity C5 and the 6th electric capacity C6 effect and above-mentioned 3rd electric capacity C3 and the 4th electric capacity C4
Effect be the same, be the function of filtering, discharge and recharge so that the 3rd LED module LEDs 3 and the 4th LED module LEDs 4 have
Continuous current flows through.
The invention provides a kind of LED drive circuit and LED illumination System, LED illumination System includes power supply, LED drivings
Circuit includes inductance, switching tube, the first electric capacity, the second electric capacity, the first diode and the second diode, first end and the electricity of inductance
The first end connection in source, the second end of inductance is connected with the first end of switching tube and the first end of the first electric capacity respectively, switching tube
The second end and the second end of power supply connect, the anode and the second diode of the second end of the first electric capacity respectively with the first diode
Negative electrode connection, the negative electrode of the first diode is connected with the anode of the first LED modules, the anode of the second diode and the 2nd LED
The negative electrode connection of module, the negative electrode of the first LED modules is connected with the anode of the 2nd LED modules, its common port and the second electric capacity
First end is connected, and the second end of the second electric capacity and the second end of power supply are connected.
The present invention is realized by adjusting the energy that the conducting dutycycle i.e. adjustable source of switching tube is provided to LED modules
The regulation of LED luminance, and due to flowing into current integration of the current integration equal to the first capacitor of outflow of the first capacitor, so that
So that the average value for flowing through the electric current of LED modules is equal, the effect flowed has been reached, circuit structure of the present invention is simple and cost
Low, easily exploitation, is conducive to marketing.
In addition, passing through the first electric capacity and second between the input power side of LED drive circuit in the application and LED modules
Electric capacity carries out energy transmission, and electric charge is not directly through the two ends of the first electric capacity, and also no electric charge is directly through the second electric capacity
Two ends, therefore the LED drive circuit using the first electric capacity and the second electric capacity realize input power to output isolation, circuit
It is simple in construction and cost is low.
In order to solve the above technical problems, present invention also offers a kind of LED illumination System, including power supply, in addition to as above
The LED drive circuit stated.
As a kind of preferred embodiment, power supply is dc source or AC power.
Specifically, the power supply in LED illumination System provided by the present invention both can be that dc source can also be exchange
Power supply, is specifically determined from which kind of power supply according to actual conditions.
The introduction of LED drive circuit in the LED illumination System provided for the present invention refer to above-described embodiment, this hair
It is bright to will not be repeated here.
It should be noted that in this manual, such as first and second or the like relational terms are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
1. a kind of LED drive circuit, applied to LED illumination System, the LED illumination System includes power supply, it is characterised in that institute
Stating LED drive circuit includes inductance, switching tube, the first electric capacity, the second electric capacity, the first diode and the second diode, wherein：
The first end of the inductance is connected with the first end of the power supply, the second end of the inductance respectively with the switching tube
First end and the connection of the first end of first electric capacity, the second end of the switching tube are connected with the second end of the power supply, institute
The second end for stating the first electric capacity is connected with the anode of first diode and the negative electrode of second diode respectively, and described
The negative electrode of one diode is connected with the anode of the first LED modules, the anode of second diode and the negative electrode of the 2nd LED modules
Connection, the negative electrode of the first LED modules is connected with the anode of the 2nd LED modules, its common port and second electric capacity
First end connection, the second end of second electric capacity is connected with the second end of the power supply.
2. LED drive circuit as claimed in claim 1, it is characterised in that the LED drive circuit also include the 3rd electric capacity and
4th electric capacity, the 3rd electric capacity and the first LED modules in parallel, the 4th electric capacity and the 2nd LED modules in parallel.
3. LED drive circuit as claimed in claim 2, it is characterised in that the LED drive circuit also includes the 3rd diode
With the 4th diode, wherein：
The anode of 3rd diode connects with the anode of second diode and the negative electrode of the first LED modules respectively
Connect, the negative electrode of the 3rd diode is connected with the first end of second electric capacity and the anode of the 4th diode respectively,
The negative electrode of 4th diode is connected with the anode of the 2nd LED modules.
4. LED drive circuit as claimed in claim 2, it is characterised in that the LED drive circuit also includes the three or two pole
Pipe, the 4th diode, the 3rd LED modules and the 4th LED modules, wherein：
The anode of the 3rd LED modules respectively with the negative electrode of the first LED modules, the negative electrode of the 2nd LED modules and
The negative electrode connection of the 4th LED modules, the negative electrode of the 3rd LED modules is connected with the anode of the 3rd diode, institute
The negative electrode for stating the 3rd diode is connected with the first end of second electric capacity；The anode and the described 4th of the 4th LED modules
The negative electrode connection of diode, the anode of the 4th diode is connected with the first end of second electric capacity.
5. LED drive circuit as claimed in claim 4, it is characterised in that the LED drive circuit also include the 5th electric capacity and
6th electric capacity, wherein：
5th electric capacity and the 3rd LED modules in parallel, the 6th electric capacity and the 4th LED modules in parallel.
6. the LED drive circuit as described in claim any one of 1-5, it is characterised in that the power supply is dc source, described
Switching tube includes NMOS or PMOS, correspondingly, the drain electrode of the NMOS as the switching tube first end, it is described
NMOS source electrode as the switching tube the second end；Or, the source electrode of the PMOS is used as the first end of the switching tube, institute
The drain electrode for stating PMOS is used as the second end of the switching tube.
7. the LED drive circuit as described in claim any one of 1-5, it is characterised in that the power supply is AC power, described
Switching tube includes the PMOS of NMOS or two differential concatenation of two differential concatenations, correspondingly, and first NMOS drain electrode is made
For the first end of the switching tube, first NMOS source electrode is connected with second NMOS source electrode, second NMOS drain electrode
It is used as the second end of the switching tube；Or, first PMOS drain electrode is used as the first end of the switching tube, first PMOS
Source electrode be connected with second PMOS source electrode, second PMOS drain electrode as the switching tube the second end.
8. a kind of LED illumination System, including power supply, it is characterised in that also including the LED as described in claim any one of 1-7
Drive circuit.
9. LED illumination System as claimed in claim 8, it is characterised in that the power supply is dc source or AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339588.7A CN106982495A (en) | 2017-05-15 | 2017-05-15 | A kind of LED drive circuit and LED illumination System |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339588.7A CN106982495A (en) | 2017-05-15 | 2017-05-15 | A kind of LED drive circuit and LED illumination System |
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| Publication Number | Publication Date |
|---|---|
| CN106982495A true CN106982495A (en) | 2017-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710339588.7A Pending CN106982495A (en) | 2017-05-15 | 2017-05-15 | A kind of LED drive circuit and LED illumination System |
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| CN109257845A (en) * | 2018-09-26 | 2019-01-22 | 深圳市中州远光照明科技有限公司 | A kind of the LED power supply and its adjusting method of changeable frequency |
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Application publication date: 20170725 |