CN109587891A - Efficient linear LED drive circuit - Google Patents
Efficient linear LED drive circuit Download PDFInfo
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- CN109587891A CN109587891A CN201811635050.1A CN201811635050A CN109587891A CN 109587891 A CN109587891 A CN 109587891A CN 201811635050 A CN201811635050 A CN 201811635050A CN 109587891 A CN109587891 A CN 109587891A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 10
- 230000001052 transient effect Effects 0.000 claims description 10
- 238000012512 characterization method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
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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]
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of efficient linear LED drive circuits, including linear regulation pipe and control circuit, input voltage is obtained after the rectified circuit rectifies of alternating current input power supplying, the linear regulation pipe is connected with LED load, the input voltage powers to LED load, the control circuit is connect with the control terminal of the linear regulation pipe, the electric current of the linear regulation pipe is flowed through by control circuit control, in half of power frequency period, set gradually the first workspace, second workspace and third workspace, the electric current that linear regulation pipe is flowed through in first workspace is the first electric current, the electric current that linear regulation pipe is flowed through in second workspace is the second electric current, the electric current that linear regulation pipe is flowed through in the third workspace is third electric current, first electric current is equal to the third electric current, the change of second electric current Change trend with corresponding input voltage on the contrary, and at the peak value of the input voltage, second electric current touches the bottom.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of efficient linear LED drive circuit.
Background technique
The linear LED drive circuit of the prior art, including rectification circuit, linear regulation pipe and for controlling linear regulation pipe
Control circuit.The control circuit, which passes through, samples the electric current for flowing through the linear regulation pipe and corresponding average current reference value
Error processing is carried out, to control the state of the linear regulation pipe, to realize output constant current.
Voltage VIN, LED both end voltage VLED and output current wave are as shown in Figure 1, voltage VIN is sinusoidal wave shape, in work
In the frequency period, closer to the peak position of voltage VIN waveform, voltage VIN and the pressure difference of LED load both end voltage VLED are got over
Greatly.Power consumption on linear regulation pipe M01 is (VIN-VLED) * Iout, i.e., when voltage VIN ratio LED both end voltage VLED is more greatly,
Power consumption then on linear regulation pipe M01 is bigger, and system effectiveness is lower.
In the prior art, since the efficiency of linear LED drive circuit is lower, so be less applied in dimmer application,
It is used as in LED dimming driving circuit by using Switching Power Supply.However, the cost of Switching Power Supply is higher than linear drive circuit, people
Be sought for improving the efficiency of linear LED drive circuit to adapt to the scheme of dimmer application.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of efficient lines for reducing linear regulation pipe power consumption and realizing light modulation
Property LED drive circuit is big to solve the power consumption on linear regulation pipe of the existing technology, it is difficult to applied to dimmer application
Technical problem.
The technical solution of the invention is as follows, provides a kind of efficient linear LED drive circuit with flowering structure, including linear
Regulation pipe and control circuit obtain input voltage, the linear regulation pipe and LED after the rectified circuit rectifies of alternating current input power supplying
Load in series, the input voltage power to LED load, and the control terminal of the control circuit and the linear regulation pipe connects
It connects；
It is successively set in half of power frequency period by the electric current that control circuit control flows through the linear regulation pipe
The first workspace, the second workspace and third workspace are set, the electric current that linear regulation pipe is flowed through in first workspace is the
One electric current, the electric current that linear regulation pipe is flowed through in second workspace is the second electric current, flows through line in the third workspace
Property regulation pipe electric current be third electric current, first electric current be equal to the third electric current, the variation tendency of second electric current
With corresponding input voltage on the contrary, and at the peak value of the input voltage, second electric current touches the bottom.
Optionally, the electric current of the linear regulation pipe of sample streams obtains the first voltage sampled signal of characterization output electric current, will
The first voltage sampled signal and variable average current reference signal carry out error compensation processing, obtain Average Current Control letter
Number, according at least one in the first workspace described in the Average Current Control Signal Regulation, the second workspace and third workspace
At least one current value in the duration of a workspace or adjusting first electric current, the second electric current and third electric current, with
So that the average output current of the LED drive circuit levels off to the output electricity that the variable average current reference signal characterized
Flow valuve.
Optionally, the variable average current reference signal is adjusted according to dim signal, flows through being averaged for load to adjust
Export electric current.
Optionally, the dim signal is PWM dim signal or simulation dim signal, is PWM light modulation in dim signal
When signal, then the PWM dim signal switchs to adjust the variable average current according to the analog voltage and join for analog voltage
Examine signal；When dim signal is simulation dim signal, then the variable average current is adjusted according to the simulation dim signal
Reference signal.
Optionally, the control circuit includes the first operational amplifier, the first input end of first operational amplifier
The first voltage sampled signal is received, the second input terminal of first operational amplifier receives transient current reference signal.
Optionally, the control circuit further includes reference signal generation circuit, for generating the transient current reference
Signal, the reference signal generation circuit include first capacitor, charging current source and discharge current source, the charging current source and
Discharge current source is connect with the first capacitor, is filled by control charging current source and discharge current source to the first capacitor
Electric discharge is to adjust the voltage in first capacitor, and the voltage in the first capacitor is as transient current reference signal.
Optionally, the reference signal generation circuit further includes first comparator, and the first of the first comparator is defeated
Enter end to connect with the first capacitor, the second input terminal of the first comparator receives the first reference voltage, first ginseng
The desired value of the first electric current and the second electric current described in characterization is examined, the output signal of the first comparator is used in the first electricity
Hold control charging current source when voltage reaches first reference voltage and stops charging.
Optionally, in the second workspace, including first stage and second stage, in the first phase, the electric discharge electricity
Stream source starts to discharge to first capacitor, and charging current source does not charge to first capacitor at this time, in the peak value of the input voltage
It carves, second electric current touches the bottom, and the first stage terminates, and in second stage, the discharge current source stops electric discharge, institute
Charging current source is stated to start to charge to the first capacitor, when the first capacitor voltage reaches first reference voltage,
The charging current source stops charging, and second stage terminates.
Optionally, the reference signal generation circuit further includes peak detection circuit, the peak detection circuit connection
The hot end of input voltage, for detecting the peak value moment of the input voltage.
Optionally, the peak detection circuit detects the input by detecting the change rate of the input voltage
The peak value moment of voltage.
Using the present invention, compared with prior art, have the advantage that the present invention is provided with three workspaces, the first work
The first electric current for making area is equal with the third electric current of third workspace, and the electric current of the second workspace is in opposite change with input voltage
Change trend, and it is able to achieve the adjusting of average current, variable average current is adjusted with reference to letter by pwm signal or simulation dim signal
Number, to realize light modulation.Present invention reduces the power consumption of linear regulation pipe, system effectiveness is improved, and realizes and is based on efficient linear
PWM light modulation and simulation light modulation under LED drive circuit.
Detailed description of the invention
Fig. 1 is the working waveform figure of prior art LED drive circuit；
Fig. 2 is the functional block diagram of efficient linear LED of the present invention；
Fig. 3 is the working waveform figure of efficient linear LED of the present invention；
Fig. 4 is the structural schematic diagram of reference signal generation circuit；
Fig. 5 is the circuit structure diagram of peak detection circuit；
Fig. 6 is the relation schematic diagram of dim signal and variable average current reference signal.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Basic implementation of the invention is as follows: LED drive circuit of the invention, including linear regulation pipe and control electricity
Road obtains input voltage after the rectified circuit rectifies of alternating current input power supplying, and the linear regulation pipe is connected with LED load, described
Input voltage power to LED load, the control circuit connect with the control terminal of the linear regulation pipe；
It is successively set in half of power frequency period by the electric current that control circuit control flows through the linear regulation pipe
The first workspace, the second workspace and third workspace are set, the electric current that linear regulation pipe is flowed through in first workspace is the
One electric current, the electric current that linear regulation pipe is flowed through in second workspace is the second electric current, flows through line in the third workspace
Property regulation pipe electric current be third electric current, first electric current be equal to the third electric current, the variation tendency of second electric current
With corresponding input voltage on the contrary, and at the peak value of the input voltage, second electric current touches the bottom.
Based on above-mentioned basic implementation, it is described in detail using specific embodiment.
Refering to what is shown in Fig. 2, illustrating the theory structure of efficient linear LED drive circuit.Sampling resistor R01 sampling output electricity
Stream, when input voltage VIN (obtaining after by the rectified bridge rectification of alternating current input power supplying) is greater than LED load voltage VLED, electric current
LED load is begun to flow through, and initially enters the first workspace.Sampling resistor voltage VS's (i.e. first voltage sampled signal) is instantaneous
Value is equal to transient current reference signal VREF, i.e., stream is by instantaneous described in the current following of LED load and linear regulation pipe M01
Current reference signal VREF.The control circuit includes the of the first operational amplifier U12, the first operational amplifier U12
One input terminal receives the first voltage sampled signal VS, and the second input terminal of the first operational amplifier U12 receives instantaneous
Current reference signal VREF.
Efficient linear LED drive circuit of the invention can also control and adjust the average current for flowing through LED load.Sampling
The electric current for flowing through linear regulation pipe obtains the first voltage sampled signal VS of characterization output electric current, the first voltage is sampled
Signal VS and variable average current reference signal VAVE carries out error compensation processing, obtains Average Current Control signal VC, according to
The Average Current Control signal VC adjusts at least one work in first workspace, the second workspace and third workspace
At least one current value in the duration in area or adjusting first electric current, the second electric current and third electric current, so that institute
The average output current for stating LED drive circuit levels off to the output electric current that the variable average current reference signal VAVE characterized
Value.The error compensation processing is realized that the error compensation circuit includes second operational amplifier U11 by error compensation circuit
The output end of the second operational amplifier U11 is connected to compensating electric capacity C2, the compensating electric capacity C2.Second operational amplifier
Two input terminals of U11 receive first voltage sampled signal VS and variable average current reference signal VAVE respectively.Adjust first
The duration specific implementation of at least one workspace can be in workspace, the second workspace and third workspace are as follows: according to flat
At the time of equal current controling signal VC controls and adjust the first work end of extent, to start to discharge and enter the second work
Area, but it is not limited to this mode.Adjust that first electric current, at least one current value is specifically real in the second electric current and third electric current
It now can be with are as follows: the first electric current and third electric current are adjusted according to the Average Current Control signal VC, to correspondingly change the
Two electric currents, but it is not limited to this mode.
Refering to what is shown in Fig. 3, illustrating the work wave of efficient linear LED drive circuit.T indicates entire Current Zone in figure
Between, and it is provided with the first workspace t1, the second workspace t2 and third workspace t3.In the first workspace t1 and third workspace
T3 keeps transient current reference signal VREF to stablize, and the first electric current is equal to third electric current.In the second workspace t2, wink is reduced
When current reference signal VREF, and in the peak position of input voltage, the transient current reference signal VREF reaches minimum,
Then third electric current is increased to again.
Refering to what is shown in Fig. 4, illustrating the specific structure of reference signal generation circuit.The reference signal generation circuit includes
First capacitor C1, charging current source I1 and discharge current source I2, the charging current source I1 and discharge current source I2 with it is described
First capacitor C1 connection is adjusted the first capacitor C1 charge and discharge by controlling charging current source I1 and discharge current source I2
Voltage on first capacitor C1, the voltage on the first capacitor C1 is as transient current reference signal.The reference signal
Generation circuit includes first comparator U13, and the first input end of the first comparator U13 is connect with the first capacitor C1,
The second input terminal of the first comparator U13 receives the first reference voltage VREF1, the first reference signal VREF1 characterization
The desired value of first electric current and the second electric current, the output signal of the first comparator U13 are used in first capacitor C1 electricity
Control charging current source stops charging when pressure reaches the first reference voltage VREF1.For charging current source I1 and electric discharge electricity
The control of stream source I2 can control whether it accesses by switching, and can also control whether it enables by control signal,
It can also be by controlling its size of Signal Regulation.In Fig. 4, charging current source I1 and electric discharge electricity are controlled respectively with switch K1 and K2
Whether stream source I2 accesses, and connect in the input terminal of first comparator U13 with switch K1, peak value moment signal tp and the switch K2
Connection, Simultaneous Switching K1 and switch K2 are also controlled by other signals.
In the second workspace, including first stage and second stage, in the first phase, the discharge current source starts
It discharges first capacitor C1, charging current source I1 does not charge to first capacitor C1 at this time, in the peak value of the input voltage VIN
It carves, second electric current touches the bottom, and the first stage terminates, and in second stage, the discharge current source I2 stops electric discharge,
The charging current source I1 starts to charge to the first capacitor C1, when the first capacitor voltage reaches described first with reference to electricity
When pressure, the charging current source I1 stops charging, and second stage terminates.
Refering to what is shown in Fig. 5, illustrating the specific structure of peak detection circuit.The peak detection circuit sampled input voltage
VIN, specific sampling can realize that the bleeder circuit includes resistance R02 and R03, the resistance by the bleeder circuit in diagram
The voltage of R02 and R03 series connection, the two common end characterizes input voltage VIN.The common end of the resistance R02 and R03 and differential electricity
Road connection, change rate of the differential circuit to detect the input voltage VIN, the differential circuit include the second capacitor C3
It connects with resistance R04, the second capacitor C3 and resistance R04, the voltage of the common end of the two characterizes the input voltage VIN
Change rate, by it compared with reference signal VREF2, under normal circumstances, the voltage change ratio at input voltage VIN peak value is zero,
The numerical value close to zero can be set in the reference signal VREF2, certainly, it is also necessary to the actual conditions for considering application scheme, than
Such as refer to the setting factor on ground.The second capacitor C3 and the voltage of the common end resistance R04 reach the reference signal VREF2
When, then the output signal tp overturning of the second comparator U14, for tp as peak detection signal, the signal is disconnected for control switch K2
It opens, to stop discharging.
Refering to what is shown in Fig. 6, illustrating the relationship of dim signal Yu variable average current reference signal.According to dim signal tune
The variable average current reference signal is saved, to adjust the average output current for flowing through load.The dim signal is PWM tune
Optical signal or simulation dim signal, when dim signal is PWM dim signal, then the PWM dim signal switchs to for simulation electricity
Pressure adjusts the variable average current reference signal according to the analog voltage；When dim signal is simulation dim signal, then
The variable average current reference signal is adjusted according to the simulation dim signal.Fig. 6 illustrates the institute by taking PWM dim signal as an example
State analog voltage " can be adjusted described variable average directly as variable average current reference signal according to the analog voltage
Current reference signal ", it is believed that proportionality coefficient 1 can also obtain variable average current reference signal by transformation of scale.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of efficient linear LED drive circuit, including linear regulation pipe and control circuit, the rectified circuit of alternating current input power supplying
Input voltage is obtained after rectification, the linear regulation pipe is connected with LED load, and the input voltage powers to LED load, institute
Control circuit is stated to connect with the control terminal of the linear regulation pipe, it is characterised in that:
The electric current of the linear regulation pipe is flowed through by control circuit control, in half of power frequency period, sets gradually the
One workspace, the second workspace and third workspace, the electric current that linear regulation pipe is flowed through in first workspace is the first electricity
It flows, the electric current that linear regulation pipe is flowed through in second workspace is the second electric current, flows through linear tune in the third workspace
The electric current for saving pipe is third electric current, and first electric current is equal to the third electric current, the variation tendency and phase of second electric current
The input voltage answered on the contrary, and at the peak value of the input voltage, second electric current touches the bottom.
2. efficient linear LED drive circuit according to claim 1, it is characterised in that: the linear regulation pipe of sample streams
Electric current obtains the first voltage sampled signal of characterization output electric current, by the first voltage sampled signal and variable average current
Reference signal carries out error compensation processing, Average Current Control signal is obtained, according to the Average Current Control Signal Regulation institute
It states the first workspace, the duration of at least one workspace or adjust described the in the second workspace and third workspace
At least one current value in one electric current, the second electric current and third electric current, so that the average output current of the LED drive circuit
The output current value that the variable average current reference signal that levels off to is characterized.
3. efficient linear LED drive circuit according to claim 2, it is characterised in that: described in being adjusted according to dim signal
Variable average current reference signal, to adjust the average output current for flowing through load.
4. efficient linear LED drive circuit according to claim 3, it is characterised in that: the dim signal is PWM tune
Optical signal or simulation dim signal, when dim signal is PWM dim signal, then the PWM dim signal switchs to for simulation electricity
Pressure adjusts the variable average current reference signal according to the analog voltage；When dim signal is simulation dim signal, then
The variable average current reference signal is adjusted according to the simulation dim signal.
5. efficient linear LED drive circuit according to any one of claims 1-4, it is characterised in that: the control electricity
Road includes the first operational amplifier, and the first input end of first operational amplifier receives the first voltage sampled signal,
Second input terminal of first operational amplifier receives transient current reference signal.
6. efficient linear LED drive circuit according to claim 5, it is characterised in that: the control circuit further includes
Reference signal generation circuit, for generating the transient current reference signal, the reference signal generation circuit includes the first electricity
Hold, charging current source and discharge current source, the charging current source and discharge current source connect with the first capacitor, pass through
Control charging current source and discharge current source adjust the voltage in first capacitor to the first capacitor charge and discharge, and described first
Voltage on capacitor is as transient current reference signal.
7. efficient linear LED drive circuit according to claim 7, it is characterised in that: the reference signal generates electricity
Road further includes first comparator, and the first input end of the first comparator is connect with the first capacitor, and described first compares
Second input terminal of device receives the first reference voltage, and first reference signal characterizes the phase of first electric current and the second electric current
Prestige value, the output signal of the first comparator are used to control charging when first capacitor voltage reaches first reference voltage
Current source stops charging.
8. efficient linear LED drive circuit according to claim 7, it is characterised in that: in the second workspace, including the
One stage and second stage, in the first phase, the discharge current source start to discharge to first capacitor, at this time charging current source
It does not charge to first capacitor, in the peak value moment of the input voltage, second electric current touches the bottom, first stage knot
Beam, in second stage, the discharge current source stops electric discharge, and the charging current source starts to charge to the first capacitor,
When the first capacitor voltage reaches first reference voltage, the charging current source stops charging, and second stage terminates.
9. efficient linear LED drive circuit according to claim 8, it is characterised in that: the reference signal generates electricity
Road further includes peak detection circuit, the hot end of the peak detection circuit connection input voltage, for detecting the input
The peak value moment of voltage.
10. efficient linear LED drive circuit according to claim 9, it is characterised in that: the peak detection circuit
The peak value moment of the input voltage is detected by detecting the change rate of the input voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635050.1A CN109587891A (en) | 2018-12-29 | 2018-12-29 | Efficient linear LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635050.1A CN109587891A (en) | 2018-12-29 | 2018-12-29 | Efficient linear LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115665926A (en) * | 2022-11-14 | 2023-01-31 | 灿芯半导体(成都)有限公司 | LED driving chip of second-order charging and discharging circuit |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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| CB02 | Change of applicant information |