CN208300070U - The high-power LED drive circuit of constant current is realized based on frequency modulation ballast - Google Patents
The high-power LED drive circuit of constant current is realized based on frequency modulation ballast Download PDFInfo
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- CN208300070U CN208300070U CN201820437251.XU CN201820437251U CN208300070U CN 208300070 U CN208300070 U CN 208300070U CN 201820437251 U CN201820437251 U CN 201820437251U CN 208300070 U CN208300070 U CN 208300070U
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Abstract
The utility model discloses a kind of high-power LED drive circuits that constant current is realized based on frequency modulation ballast, input rectifying filter circuit including being sequentially connected in series, the half-bridge control circuit based on one of IR2151, IR2153, IR2155 driving chip chip, isolating transformer, output rectifier and filter, it further include the control chip power supply circuit of the electrolytic capacitor charging connected for the power port of half-bridge control circuit, the half-bridge mid point of the input terminal connection half-bridge control circuit of the control chip power supply circuit, output end connect the power end of half bridge control chip.The utility model structure is simple, enables the driving current of output more stable.The utility model is suitable for driving great power LED.
Description
Technical field
The utility model belongs to technical field of electronic devices, is related to a kind of LED drive circuit, and specifically one kind is based on
The high-power LED drive circuit of frequency modulation ballast realization constant current.
Background technique
With the continuous consumption of global energy, electronic technology constantly develops towards the direction of low energy consumption, and power-saving technology is
It is promoted rapidly in electronic product.Wherein, the LED illumination lamp in electronic product is since work efficiency is high, energy consumption is low for it, extensively
Applied to multiple occasions such as street lighting, room lighting.Since LED illumination lamp has the working characteristics of constant current, therefore, in order to ensure that
The operational advantages of LED illumination lamp, the constant current LED drive circuit of efficient stable are crucial.
In the prior art, compared to the constant-current drive circuit chip of mainstream, tri- kinds of IR2151, IR2153, IR2155 drivings
Chip due to have the advantages that the cheap, source of goods in the market is stablized (there is no supply of material problem), peripheral circuit is succinct and by
It is widely applied, simultaneously because the chip interior of 8 ports of above-mentioned three kinds of driving chips is only integrated with an oscillator and two
Height MOS driving, therefore only need simple several devices that can drive the chip operation in actual use.
Since tri- kinds of driving chips of IR2151, IR2153, IR2155 have above advantages, if that can will be above-mentioned
Three kinds of chips are applied to that the cost and simplified control of constant current LED drive circuit will be will be greatly reduced in constant current LED drive circuit
Mode.But tri- kinds of driving chip application circuits of IR2151, IR2153, IR2155 in traditional structure are as shown in Figure 1, as shown in Figure 1,
The feeder ear of above-mentioned three kinds of driving chips is discharged by electrolytic capacitor C2 to be provided, and electrolytic capacitor C2 needs the electricity by flowing through resistance R1
Current charge, for the normal work for guaranteeing electrolytic capacitor C2, charging current will be a no small numerical value, and high current can be in electricity
Biggish power consumption is caused on resistance R1, is unfavorable for the heat dissipation of energy saving and chip periphery circuit.
In addition, above-mentioned three kinds of driving chips do not export the port that directly controls of electric current, therefore want to pass through such chip
Stability contorting, which exports constant current, has certain difficulty.
Utility model content
The purpose of the utility model is to provide a kind of high-power LED drive circuit that constant current is realized based on frequency modulation ballast, benefits
Use tri- kinds of driving chips of IR2151, IR2153, IR2155 and its peripheral circuit in the prior art as core, to provide power consumption
Low, the good high-power LED drive circuit that constant current is realized based on frequency modulation ballast of stability.
To achieve the above object, used technical solution is as follows for the utility model:
A kind of high-power LED drive circuit for realizing constant current based on frequency modulation ballast, including the input rectifying filter being sequentially connected in series
Wave circuit, the half-bridge control circuit based on one of IR2151, IR2153, IR2155 driving chip chip, isolating transformer,
Output rectifier and filter further includes the control chip confession of the electrolytic capacitor charging connected for the power port of half-bridge control circuit
Circuit, the half-bridge mid point of the input terminal connection half-bridge control circuit of the control chip power supply circuit, output end connect half-bridge
The power end of control circuit.
As the restriction to input rectifying filter circuit in the utility model: the input rectifying filter circuit includes first
The first rectifier bridge that diode is constituted to the 4th diode, and it is connected to the first capacitor device of the first rectification bridge output end.
As the restriction to half-bridge control circuit in the utility model: the half-bridge control circuit includes driving chip, institute
It states driving chip and the second to the 5th capacitor, first resistor to the 4th resistance, the first triode, the second triode constitutes tradition
Driving circuit, and the port VS of driving chip passes through the primary side of the 5th capacitance connection isolating transformer.
As the restriction to output rectifier and filter in the utility model: the output rectifier and filter includes the 6th
The second rectifier bridge constituted to the 9th diode, and is connected to the 6th capacitor of the second rectification bridge output end, and described the
The input terminal of two rectifier bridges passes through the secondary side of the first inductance connection isolating transformer.
As the restriction to feed circuit in the utility model: it further includes the feedback electricity for adjusting outputting current steadily
Road, the positive electrode of the output loading of the input terminal connection output rectifier and filter of the feed back input circuit, output end the
The primary side of one photoelectrical coupler, using the positive electrode concatenation thirteenth resistor of circuit output to operational amplifier and photoelectric coupling
The power supply of device primary side, the feedback end are serially connected between the port RT of the driving chip of half-bridge control circuit and the port CT.
Further define that it further includes for adjusting outputting current steadily as to the feed circuit in the utility model
Feed circuit, the feed back input circuit input terminal connection output rectifier and filter output loading positive electrode, it is defeated
Outlet is the primary side of photoelectrical coupler, using the positive electrode concatenation thirteenth resistor of circuit output to operational amplifier and photoelectricity
Coupler primary power supply, the feedback end are serially connected between the port RT of the driving chip of half-bridge control circuit and the port CT.
As the restriction to chip power supply circuit is controlled in the utility model: the control chip power supply circuit includes the 8th
One end of capacitor, the tenth diode, the second voltage-stabiliser tube, the 8th capacitor passes through the 4th capacitor connection control chip
The port VB, the other end connects the anode of the second voltage-stabiliser tube, the plus earth of the second voltage-stabiliser tube, while the cathode of the second voltage-stabiliser tube is also
Connect the anode of the tenth diode, the port VCC of the cathode connection control chip of the tenth diode.
The utility model due to the adoption of the above technical solution, compared with prior art, acquired technological progress
It is:
(1) in the high-power LED drive circuit for realizing constant current based on frequency modulation ballast of the utility model, output rectification filter
It is provided with inductance in circuit, the high-impedance behavior of inductance under high frequency condition can be utilized when the utility model circuit works, so that
The impedance for depending mainly on the size of inductance for exporting electric current, when load changes, preliminarily stabilised exports electric current；
(2) the utility model is equipped with control chip power supply circuit, and the square wave at half-bridge bridge arm midpoint is accessed the 8th capacitor
C8 carries out partial pressure and current limliting, while voltage-stabiliser tube is set as 12V, is slightly larger than operating voltage, passes through the tenth diode of one-way conduction
D10 charges to the second capacitor C2, compared with the typically typical application circuit of control chip, increases all the way to the second capacitor
The path of C2 charging, and then the power consumption that chip feeder ear series resistor R1 is controlled in original structure is reduced, reduce the hair of resistance
Heat, extends the service life of resistance, while reducing the temperature of control chip periphery, improves the reliability of control chip；
(3) the utility model is provided with feed circuit, and the oscillation resistance of oscillator is adjusted by the feed circuit in circuit
Value, carrys out regulating switch frequency, it is thus possible to realize: when external factor causes output voltage to increase and then electric current increases, with increasing
Add the method for switching frequency, to increase the impedance of output end inductance, reduces output electric current；When output voltage reduces and then exports electricity
When stream reduces, reduce switching frequency, reduce inductive impedance, increases output electric current, to achieve the purpose that constant current.
In conclusion the utility model structure is simple, enable the driving current of output more stable.
The utility model is suitable for driving great power LED.
Detailed description of the invention
Fig. 1 is IR2151 chip or IR2153 chip or application principle when IR2155 chip uses in the prior art
Figure；
Fig. 2 is the circuit theory of the utility model embodiment；
Fig. 3 is the equivalent circuit schematic of output rectifier and filter in the utility model embodiment；
Fig. 4 is the circuit diagram that the utility model embodiment improves power factor.
In figure: 1, input rectifying filter circuit；2, half-bridge control circuit；3, output rectifier and filter；4, chip is controlled
Power supply circuit；5, feed circuit；U1, isolating transformer；IC1, control chip；IC2, operational amplifier.
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model.It should be appreciated that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
A kind of high-power LED drive circuit that constant current is realized based on frequency modulation ballast of embodiment
As shown in Fig. 2, include be sequentially connected in series input rectifying filter circuit 1, half-bridge control circuit 2, isolating transformer U1,
Output rectifier and filter 3 further includes the control chip of the electrolytic capacitor charging connected for the power port of half-bridge control circuit 2
Power supply circuit 4, the feed circuit for adjusting outputting current steadily, the input terminal connection half of the control chip power supply circuit 4
The half-bridge mid point of bridge control circuit 2, output end connect the power end of half-bridge control circuit 2；The input terminal of the feed circuit connects
The positive electrode of the output loading of output rectifier and filter is connect, output end is the primary side of the first photoelectrical coupler, is gone here and there using output
It connects thirteenth resistor to power to operational amplifier and photoelectrical coupler primary side OCA, the feedback end of feed circuit is serially connected with half-bridge
Between the port RT and the port CT of the driving chip of control circuit.
Input rectifying filter circuit 1 in the present embodiment includes first that first diode D1 to the 4th diode D4 is constituted
Rectifier bridge, and it is connected to the cathode connection the of first capacitor the device C1, the first diode D1 of the first rectification bridge output end
The cathode of two diode D2, the cathode of the anode connection third diode D3 of the second diode D2, the anode of third diode D3
Connect the anode of the 4th diode D4, the anode of the anode connection first diode D1 of the 4th diode D4, and first diode
The intermediate node conduct that the intermediate node that D1, the 4th diode D4 are connected is connect with the second diode D2, third diode D3
The input terminal of input rectifying filter circuit 1, and first diode D1, the intermediate node of the second diode D2 connection and the three or two pole
Pipe D3, the 4th diode D4 connection intermediate node and connect output after first capacitor device C1 as input rectifying filter circuit 1
End.
The half-bridge control circuit 2 uses IR2151 chip in the prior art perhaps IR2153 chip or IR2155
One of driving chip controls chip IC 1 and capacitance resistance composition of its periphery, specifically as shown in Figure 2:
The port VCC of the control chip IC 1 passes through the output end of first resistor R1 connection input rectifying filter circuit
One end, while the port VB of itself is also connect with the series circuit of the 5th diode D5 by first resistor R1；The port VCC
The other end and ground of the output end of input rectifying filter circuit are also separately connected by the second capacitor C2.
The port RT of the control chip IC 1 connects the port CT of itself by second resistance R2, while also passing through second
The series circuit of resistance R2 and third capacitor C3 is separately connected the COM port and ground of itself.
The port VB of the control chip IC 1 is connect by the sequential circuit of the first field-effect tube Q1 and the second field-effect tube Q2
Ground, wherein the port VB connects the drain electrode of the first field-effect tube Q1, and the source electrode of the first field-effect tube Q1 connects the second field-effect tube Q2
Drain electrode, the source electrode ground connection of the second field-effect tube Q2, the grid of the first field-effect tube Q1 passes through 3rd resistor R3 connection control
The port HO of coremaking piece IC1, the grid of the second field-effect tube Q2 control the port LO of chip IC 1 by the 4th resistance R4 connection,
The port VS for controlling chip IC 1 passes through one end of the 5th capacitor C5 connection isolating transformer U1 primary side, and isolating transformer U1 is former
The other end on side is grounded.
The output rectifier and filter 3 includes the second rectifier bridge that the 6th diode D6 is constituted to the 9th diode D9,
And it is connected to the 6th capacitor C6 of the second rectification bridge output end, the input terminal of second rectifier bridge passes through the first inductance
The secondary side of L1 connection isolating transformer.Specific connection are as follows: the cathode of the 6th diode D6 connects the sun of the 7th diode D7
Pole, the cathode of the 7th diode D7 connect the cathode of the 8th diode D8, and the anode of the 8th diode D8 connects the 9th diode
The cathode of D9, the anode of the 9th diode D9 connects the anode of the 6th diode D6, wherein the 6th diode D6, the 7th diode
The intermediate node that the intermediate node of D7 connection is connect with the 8th diode D8, the 9th diode D9 is as output rectifier and filter
3 input terminal, and change is isolated by the first inductance L1 connection with the intermediate node of the 7th diode D7 connection in the 6th diode D6
The one end on the secondary side of depressor U1, the other end on isolating transformer U1 pair side connect the 8th diode D8 and connect with the 9th diode D9
Intermediate node.And the intermediate node and the 9th diode D9, the 6th diode of the 7th diode D7, the 8th diode D8 connection
The intermediate node of D6 connection simultaneously connects after the 6th capacitor C6 as 3 output end of output rectifier and filter.
The control chip power supply circuit includes the 8th capacitor C8, the tenth diode D10, the second voltage-stabiliser tube ZD2, described
One end of 8th capacitor C8 controls the port VB of chip by connection at the 4th capacitor, and the other end connects the second voltage-stabiliser tube and looks for
The anode arrived, the plus earth of the second voltage-stabiliser tube ZD2, while the cathode of the second voltage-stabiliser tube ZD2 is also connected with the tenth diode D10's
Anode, the port VCC of the cathode connection control chip of the tenth diode D10.
The feed circuit includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, one end of the 5th resistance R5
The intermediate node that the 7th diode D7 of the second rectifier bridge is connect with the 8th diode D8 is connected, the other end passes sequentially through the 6th resistance
R6, the 7th resistance R7 ground connection；It further include operational amplifier IC2, the 6th electricity of inverting input terminal connection of the operational amplifier IC2
The intermediate node of R6 and the 7th resistance R7 sequential circuit are hindered, the non-inverting input terminal of operational amplifier IC2 passes through the 9th capacitor C9
The output end of ground connection, operational amplifier IC2 is distinguished by the sequential circuit of photoelectrical coupler primary side OCA and eleventh resistor R11
One end of thirteenth resistor R13 and the anode of the first voltage-stabiliser tube ZD1 are connected, the other end of the thirteenth resistor R13 is as defeated
Outlet, and the minus earth of the first voltage-stabiliser tube ZD1, while the both ends of the first voltage-stabiliser tube ZD1 are parallel with the tenth capacitor C10；Institute
State operational amplifier IC2 output end also pass through the 8th resistance R8, the 7th capacitor C7 concatenation after it is in parallel with the 9th resistance R9
The inverting input terminal of circuit connection itself.
The secondary side OCB of photoelectrical coupler connects the port CT and the port RT of driving chip IC1 after concatenating with the tenth resistance R10
Between, wherein the port RT of one end connection driving chip of the tenth resistance R1O, the other end connect photoelectrical coupler pair side OCB's
The collector of triode, the port CT of the emitter connection driving chip IC1 of the triode of photoelectrical coupler pair side OCB.
The working principle of the present embodiment are as follows: the present embodiment by the AC signal of input by input rectifying filter circuit 1 into
Row rectifying and wave-filtering is changed into direct current signal and works for half-bridge control circuit 2, and the drive of a pair of of complementation is generated by controlling chip IC 1
The switching tube up and down of dynamic signal control half-bridge opens closure, generates square-wave signal.Square-wave signal can generate alternation letter by capacitor
Number, it is depressured by isolating transformer U1, generates sine wave or be similar to the alternating signal Vac of sine wave, by the first inductance L1
After 3 rectifying and wave-filtering of output rectifier and filter, more stable electric current output can reach.Its entire output circuit can be carried out
Equivalent (wherein L1 is inductance L1 inductance value, and RL is the equivalent resistance of load) as shown in Figure 3, knows to flow through the loop by analysis
Electric current be approximately
(1)
As can be seen that loop current changes according to working frequency and changed from above-mentioned formula, the circuit is according to work
The different outputs of working frequency, which change, belongs to PFM modulation.The circuit of this reality embodiment works under high frequency condition, at this time low inductance
Induction reactance is very big relative to output loading, plays a major role to size of current, and when circuit load, that is, RL changes, output electric current is almost
It is constant.
For the constant current output for being further ensured that LED drive circuit, feedback loop is added in circuit in the present embodiment, as shown in figure 1
The 5th resistance R5, the 6th resistance R6, the 7th resistance R7 of feed circuit 52 divide output voltage, obtain sampling electric signal
That is the 7th resistance R7 voltage difference of the two ends is added in the reverse side of operational amplifier IC2 and connects the ginseng in operational amplifier IC2 in-phase end
Voltage Vref comparison is examined, the electric signal of faint variation is amplified, when output electric current becomes larger, VR7 increases, operational amplifier
The output end voltage of IC2 reduces, and the electric current that photoelectrical coupler primary side OCA flows through increases, so that tri- pole photoelectrical coupler pair side OCB
Pipe base current also increases, and the equivalent resistance for being equivalent to photoelectrical coupler pair side OCB reduces, and the present embodiment uses control chip
The frequency of output drive signal are as follows:
(2)
Wherein Rs is chip interior resistance, has above-mentioned formula it is found that output frequency increases at this time, according to analytical formula (1)
(2) electric current is exported it is found that increasing frequency and will reduce, has haved the function that adjust electric current.
Fig. 4 is the implementation figure that the present embodiment improves power factor (PF), for the biggish occasion of power factor command.Specific implementation
When, bridge filter circuit in input rectifying filter circuit 1 is become into valley fill type PF correcting circuit, at this point, input rectifying filtered electrical
Road embodiment is as follows: one end phase of the cathode of the anode of first diode D1 and the 4th diode D4 and AC input
Even, the anode of the second diode D2 and the negative electrode of third diode D3 are connected with the other end of AC input, and the one or two
The cathode of pole pipe D1, the cathode of the second diode D2, the positive electrode of the 12nd capacitor C12, the 13rd diode D13 cathode
Connection, negative electrode, the 11st pole of the anode of third diode D3 and the anode of the 4th diode D4 and the tenth capacitor C11
The anode of pipe D11 is with being connected to primary side.The negative electrode of 12nd capacitor C12, the cathode of the 11st diode D11, the tenth
The anode of two diode D12 is connected；The positive electrode of 11st capacitor C11, the cathode of the 12nd diode D12, the 13rd
The anode of pole pipe D13 is connected.
Claims (8)
1. a kind of high-power LED drive circuit for realizing constant current based on frequency modulation ballast, it is characterised in that: defeated including what is be sequentially connected in series
Enter current rectifying and wave filtering circuit, the half-bridge control circuit based on one of IR2151, IR2153, IR2155 driving chip chip, every
It further include charging for the electrolytic capacitor that the power port of half-bridge control circuit connects from transformer, output rectifier and filter
Control chip power supply circuit, the half-bridge mid point of the input terminal connection half-bridge control circuit of the control chip power supply circuit, output
The power end of half bridge control chip of end connection.
2. the high-power LED drive circuit according to claim 1 for realizing constant current based on frequency modulation ballast, it is characterised in that:
The input rectifying filter circuit includes the first rectifier bridge that first diode is constituted to the 4th diode, and is connected to first
The first capacitor device of rectification bridge output end.
3. the high-power LED drive circuit according to claim 1 or 2 for being realized constant current based on frequency modulation ballast, feature are existed
In: the half-bridge control circuit includes driving chip, the driving chip and the second to the 5th capacitor, first resistor to the 4th
Resistance, the first triode, the second triode constitute traditional driving circuit, and the port VS of driving chip passes through the 5th capacitor
Connect the primary side of isolating transformer.
4. the high-power LED drive circuit according to claim 1 or 2 for being realized constant current based on frequency modulation ballast, feature are existed
It include the second rectifier bridge that the 6th to the 9th diode is constituted in: the output rectifier and filter, and to be connected to second whole
The 6th capacitor of bridge output end is flowed, the input terminal of second rectifier bridge passes through the pair of the first inductance connection isolating transformer
Side.
5. the high-power LED drive circuit according to claim 3 for realizing constant current based on frequency modulation ballast, it is characterised in that:
The output rectifier and filter includes the second rectifier bridge that the 6th to the 9th diode is constituted, and is connected to the second rectifier bridge
6th capacitor of output end, the input terminal of second rectifier bridge pass through the secondary side of the first inductance connection isolating transformer.
6. the high-power LED drive circuit according to claim 3 for realizing constant current based on frequency modulation ballast, it is characterised in that:
It further includes the feed circuit for adjusting outputting current steadily, the input terminal connection output rectification filter electricity of the feed circuit
The positive electrode of the output loading on road, output end are the primary side of photoelectrical coupler, concatenate the 13rd using the positive electrode of circuit output
Resistance is powered to operational amplifier and photoelectrical coupler primary side, and the feedback end of the feed circuit is serially connected with half-bridge control circuit
Driving chip the port RT and the port CT between.
7. the high-power LED drive circuit according to claim 5 for realizing constant current based on frequency modulation ballast, it is characterised in that:
It further includes the feed circuit for adjusting outputting current steadily, the input terminal connection output rectification filter electricity of the feed circuit
The positive electrode of the output loading on road, output end are the primary side of photoelectrical coupler, concatenate the 13rd using the positive electrode of circuit output
Resistance is powered to operational amplifier and photoelectrical coupler primary side, and the feedback end of the feed circuit is serially connected with half-bridge control circuit
Driving chip the port RT and the port CT between.
8. the high-power LED drive circuit according to claim 6 or 7 for being realized constant current based on frequency modulation ballast, feature are existed
In: the control chip power supply circuit includes the 8th capacitor, the tenth diode, the second voltage-stabiliser tube, the 8th capacitor
VB port of the one end by the 4th capacitor connection control chip, the anode of the other end the second voltage-stabiliser tube of connection, the second voltage-stabiliser tube
Plus earth, while the cathode of the second voltage-stabiliser tube is also connected with the anode of the tenth diode, and the cathode of the tenth diode connects control
The port VCC of coremaking piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820437251.XU CN208300070U (en) | 2018-03-29 | 2018-03-29 | The high-power LED drive circuit of constant current is realized based on frequency modulation ballast |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820437251.XU CN208300070U (en) | 2018-03-29 | 2018-03-29 | The high-power LED drive circuit of constant current is realized based on frequency modulation ballast |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767153A (en) * | 2019-11-08 | 2020-02-07 | 深圳市德普微电子有限公司 | Pre-charging method of LED display screen |
| CN110838276A (en) * | 2019-11-08 | 2020-02-25 | 深圳市德普微电子有限公司 | Pre-charging method of LED display screen |
| CN111404383A (en) * | 2020-03-09 | 2020-07-10 | 珠海格力电器股份有限公司 | Power supply control device, air conditioner and power supply control method of air conditioner |
| CN112653253A (en) * | 2020-12-17 | 2021-04-13 | 中国航空工业集团公司北京长城航空测控技术研究所 | Energy transmission structure and energy transmission method of hollow non-contact transformer |
-
2018
- 2018-03-29 CN CN201820437251.XU patent/CN208300070U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767153A (en) * | 2019-11-08 | 2020-02-07 | 深圳市德普微电子有限公司 | Pre-charging method of LED display screen |
| CN110838276A (en) * | 2019-11-08 | 2020-02-25 | 深圳市德普微电子有限公司 | Pre-charging method of LED display screen |
| CN111404383A (en) * | 2020-03-09 | 2020-07-10 | 珠海格力电器股份有限公司 | Power supply control device, air conditioner and power supply control method of air conditioner |
| CN111404383B (en) * | 2020-03-09 | 2022-03-15 | 珠海格力电器股份有限公司 | Power supply control device, air conditioner and power supply control method of air conditioner |
| CN112653253A (en) * | 2020-12-17 | 2021-04-13 | 中国航空工业集团公司北京长城航空测控技术研究所 | Energy transmission structure and energy transmission method of hollow non-contact transformer |
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