CN107396481B - A kind of linear constant current driving circuit - Google Patents
A kind of linear constant current driving circuit Download PDFInfo
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- CN107396481B CN107396481B CN201610323004.2A CN201610323004A CN107396481B CN 107396481 B CN107396481 B CN 107396481B CN 201610323004 A CN201610323004 A CN 201610323004A CN 107396481 B CN107396481 B CN 107396481B
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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]
- H05B45/10—Controlling the intensity of the light
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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
- H05B45/395—Linear regulators
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/25—Circuit arrangements for protecting against overcurrent
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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 present invention provides a kind of linear constant current driving circuit, is powered by the rectified bridge DB1 of alternating current VAC1, loads and be sequentially connected in series for several LED, constitute an anode nodes and several LED cathode nodes；The input terminal of rectifier bridge DB1 is connected with alternating current VAC1, and output cathode is connected with anode nodes；Including a switching constant-current source CCX, a voltage detecting circuit VD, a feed circuit FB and a multiplier M.It the advantage is that the shape that mains-current waveform can be made to present close to sine wave；When line voltage virtual value is lower, the electric current for flowing through LED is reduced, LED overcurrent is avoided to run；During turning down brightness, driving circuit is from constant power mode to constant current mode gradually transition, and LED luminance caused by power network fluctuation changes when constant current mode improves low-light level application.
Description
Technical field
The present invention relates to a kind of linear drive circuits, and in particular to a kind of linear constant current LED drive circuit and is set using it
The integrated circuit of meter is suitble to LED illumination application.
Background technique
Currently, LED lamp has widely entered the illumination application of every field.LED cannot connect directly to exchange
Electricity needs to configure corresponding current limliting driving device, and current LED drives the scheme used based on traditional high frequency switch power,
The program needs high-frequency switch circuit, and circuit is complicated, at high cost, and it is one that linear constant current drive scheme, which replaces Switching Power Supply scheme,
Development trend.
The input current waveform of linear constant current drive scheme currently on the market is all impulse wave, square wave or staircase waveform
Shape, shows that power factor is lower, and harmonic distortion is larger, can be only applied in small-power illuminating product, is not suitable for high-power photograph
Bright application.
Therefore, it is necessary to research and develop a kind of power factor height, the small linear LED lighting drive scheme of harmonic distortion.
Summary of the invention
The present invention provides a kind of linear constant current driving circuit, realizes higher power factor and lower harmonic distortion, gram
Defect existing for above-mentioned technology is taken, existing technical problem is solved.
The present invention provides a kind of linear constant current driving circuit, is powered, is loaded as several by the rectified bridge DB1 of alternating current VAC1
LED is sequentially connected in series, and constitutes an anode nodes and several LED cathode nodes；The input terminal of rectifier bridge DB1 and alternating current VAC1 phase
Even, output cathode is connected with anode nodes；Including one switching constant-current source CCX, a voltage detecting circuit VD, a feed circuit FB and
One multiplier M；Wherein, switching constant-current source CCX includes that the electric current of a setting switching constant current source current sets end ISET, one publicly
GND, one reaction switching constant current source current inspection stream end CS and several constant current output ends, if several constant current output ends respectively with
Dry cathode node is connected, and common is connected to ground；Voltage detecting circuit detects line voltage waveform, output and line voltage
The voltage detection signal VO of waveform same-phase；Feed circuit FB includes a reference signal, at least one feedback end and an output
Hold FBO, feed circuit FB obtains feedback signal to the signal summation at least one feedback end, reference signal and feedback signal it
Output end FBO is output to after difference-product point；Inspection stream end CS is connected with the first feedback end IN1 of feed circuit FB, and inspection stream end CS is generated
Current signal be controlled by feed circuit FB；Multiplier M includes two input terminals MI1, MI2 and an output end MO, input terminal
MI1 is connected with voltage detection signal VO, controls the signal shape of multiplier M output end MO, input terminal MI2 and feed circuit FB's
Output end FBO is connected, and controls the signal amplitude of multiplier M output end MO, and the output end MO of multiplier M is connected to switching constant-current source
The electric current of CCX sets end ISET, the current shape and amplitude of control switching constant-current source CCX.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that further include invariable power compensation
Circuit CP；Invariable power compensation circuit CP input terminal CI detects voltage detection signal VO, generates one as voltage detection signal VO becomes
The thermal compensation signal CO for changing and being monotonically changed；Thermal compensation signal CO is connected to the second feedback end IN2 of feed circuit FB.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that invariable power compensation circuit CP also
Include a control terminal CK.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that also comprising a light adjusting circuit
DIM；The input of light adjusting circuit DIM is a variable signal DI, and output inhibits signal DO2 comprising a dim signal DO1 and one；Light modulation
Signal DO1 is connected to the third feedback end IN3 of feed circuit FB；When variable signal DI changes, cut by dim signal DO1 control
The electric current for changing current source CCX changes；Signal DO2 is inhibited to be connected to the control terminal CK of invariable power compensation circuit CP, control voltage inspection
Survey influence of the signal VO to feedback signal.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that also comprising a light adjusting circuit
DIM；The input of light adjusting circuit DIM is a variable signal DI, and output includes a dim signal DO1；Dim signal DO1 is connected to instead
The third feedback end IN3 of current feed circuit FB；When variable signal DI changes, the electricity of switchable current source CCX is controlled by dim signal DO1
Stream changes.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that also comprising a protection circuit
PRO；It protects comprising a setting thresholding inside circuit PRO, protection circuit PRO input terminal PI detects voltage detection signal VO, works as electricity
When pressure detection signal VO average value is lower than setting thresholding, protection circuit output protects signal PO, controls the electricity of switchable current source CCX
Stream declines with the decline of voltage detection signal VO.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that also comprising a protection circuit
PRO；It protects circuit PRO input terminal PI to detect voltage detection signal VO, it is proportional to voltage detection signal VO average value to generate one
Clipping thresholding, the output signal FBO of feedback control circuit FB is no more than clipping thresholding.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that the defeated of invariable power compensation circuit
The input terminal for entering end, the first input end of multiplier and protection circuit is connected to the output end of a voltage detecting circuit.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that the defeated of invariable power compensation circuit
The input terminal for entering end, the first input end of multiplier and protection circuit is connected to the same output an of voltage detecting circuit
End.
The present invention provides a kind of linear constant current driving circuit, if can also have the feature that, switching constant-current source CCX includes
Dry voltage-controlled current source examines leakage resistance RCS with several one-to-one signal bias sources of voltage-controlled current source and one；Several pressures
Control each of current source voltage-controlled current source includes two control terminals and two power ends, and the of each voltage-controlled current source
One power end is all connected to inspection stream end CS, and inspection stream end CS is connected to publicly by examining leakage resistance RCS, second power end point
Not Zuo Wei several constant current output ends, first control terminal of each voltage-controlled current source be connected to electric current setting end ISET, the
Two control terminals are connected to inspection stream end CS through corresponding signal bias source.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that several signal bias sources make
Potential in second control terminal is different, the constant current output end of the higher voltage-controlled current source of potential and potential in second control terminal
Higher cathode node is connected, and the constant current output end of the lower voltage-controlled current source of potential and potential are lower in second control terminal
Cathode node is connected.
The present invention provides a kind of linear constant current driving circuit, if can also have the feature that, switching constant-current source CCX includes
Dry voltage-controlled current source examines leakage resistance RCS with several one-to-one signal bias sources of voltage-controlled current source and one；Several pressures
Control each of current source voltage-controlled current source includes two control terminals and two power ends, and the of each voltage-controlled current source
One power end is all connected to inspection stream end CS, and inspection stream end CS is connected to publicly by examining leakage resistance RCS, second power end point
Not Zuo Wei several constant current output ends, first control terminal of each voltage-controlled current source be connected to through corresponding signal bias source
Electric current sets end ISET, and second control terminal is connected to inspection stream end CS.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that several signal bias sources make
Potential in first control terminal of several voltage-controlled current sources is different, the higher voltage-controlled current source of potential in first control terminal
Constant current output end be connected with the lower cathode node of potential, the constant current of the lower voltage-controlled current source of potential in first control terminal
Output end is connected with the higher cathode node of potential.
The present invention provides a kind of linear constant current driving circuit, if can also have the feature that, switching constant-current source CCX includes
Dry voltage-controlled current source examines leakage resistance RCS with several one-to-one signal bias sources of voltage-controlled current source and one；Several pressures
Control each of current source voltage-controlled current source includes two control terminals and two power ends, and the of each voltage-controlled current source
One power end is all connected to inspection stream end CS, and inspection stream end CS is connected to publicly by examining leakage resistance RCS, second power end point
It Zuo Wei not several constant current output ends；Two control terminals are respectively the current reference signal and current feedback letter of voltage-controlled current source
Number, current value of the difference between the two to control voltage-controlled current source；Offset signal source does not make the current setting value of voltage-controlled current source respectively not
Identical, the corresponding constant current output end of the biggish voltage-controlled current source of current setting value is connected with the lower cathode node of potential, electric current
The corresponding constant current output end of the lesser voltage-controlled current source of setting value is connected with the higher cathode node of potential.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that voltage detecting circuit VD's is defeated
Enter to hold the cathode voltage signal of VI detection rectifier bridge DB1.
The present invention provides a kind of linear constant current driving circuit, can also have the feature that voltage detecting circuit VD's is defeated
Enter to hold the voltage signal of the VI detection highest cathode node of potential.
The action and effect of invention
The linear constant current driving circuit that the present invention realizes can make mains-current waveform that the shape close to sine wave, tool be presented
There is the advantages of High Power Factor and low harmonics distortion；It, can be in addition, scheme provided by the invention is when mains fluctuation
The electric current realization substantially invariable characteristic of input power of LED is flowed through by changing, and when line voltage virtual value is lower,
The electric current for flowing through LED is reduced, LED overcurrent is avoided to run；Good light modulation may be implemented in third, scheme provided by the invention
Can, during turning down brightness, driving circuit is from constant power mode to constant current mode gradually transition, since human eye is to low intensity light
Line is more sensitive, and LED luminance caused by power network fluctuation changes when constant current mode improves low-light level application.
Detailed description of the invention
Fig. 1 is the schematic illustration of the linear constant current driving circuit of embodiment one.
Fig. 2 is the circuit diagram of the switching constant-current source CCX of embodiment one.
Fig. 3 is the circuit diagram of the voltage detecting circuit VD of embodiment one.
Fig. 4 is the circuit diagram of the feed circuit FB of embodiment one.
Fig. 5 is the circuit diagram of the invariable power compensation circuit CP of embodiment one.
Fig. 6 is the circuit diagram of the light adjusting circuit DIM of embodiment one.
Fig. 7 is the circuit diagram of the protection circuit PRO of embodiment one.
Fig. 8 is the circuit diagram of the protection circuit PRO of embodiment two.
Fig. 9 is the circuit diagram of the switching constant-current source CCX of embodiment three.
Figure 10 is the circuit diagram of the switching constant-current source CCX of example IV.
Figure 11 is the circuit diagram of the switching constant-current source CCX of embodiment five.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
Embodiment one
Fig. 1 is the schematic illustration of the linear constant current driving circuit of embodiment one.
As shown in Figure 1, LED1, LED2, LEDX are followed in series to form load, an anode nodes A0 and several yin are formed
The input terminal of pole node A1, A2 and AX, rectifier bridge DB1 are connected with alternating current VAC1, and output cathode is connected with anode nodes A0, output
Cathode ground connection, driving circuit include: switching constant-current source CCX, voltage detecting circuit VD, feed circuit FB, multiplier M, invariable power
Compensation circuit CP, protection circuit PRO and light adjusting circuit DIM.
Switching constant-current source CCX includes the electric current setting end ISET of a setting switching constant current source current, one publicly GND, one
The inspection stream end CS and several constant current output ends OUT1, OUT2 and OUTX of reaction switching constant current source current, OUT1, OUT2 and OUTX
It is connected respectively with several cathode nodes A1, A2 and AX, common GND ground connection.
The input terminal VI of voltage detecting circuit VD is connected to the output cathode of rectifier bridge DB1, or is connected to potential highest
Cathode node A1 generate the voltage detection signal VO with line voltage waveform same-phase for detecting mains waveform.
Feed circuit FB includes feedback end IN1, IN2, IN3 and output end FBO, and feed circuit FB is to feedback end IN1, IN2
Feedback signal is obtained with the signal summation on IN3, is connected to output end FBO after making error intergal with internal reference signal.
The current signal that the inspection stream end CS of switching constant-current source CCX is generated has reacted the electric current of LED1, LED2 and LEDX, and anti-
The first feedback end IN1 of current feed circuit FB is connected, and the current signal of inspection stream end CS is controlled by feed circuit FB.
Multiplier M includes two input terminals MI1, MI2 and output end a MO, first input terminal MI 1 and voltage detecting
Signal VO is connected, and controls the signal shape of multiplier outputs MO, the output end of second input terminal MI2 and feed circuit FB
FBO is connected, and controls the signal amplitude of multiplier outputs MO, and multiplier outputs MO is connected to the electric current of switching constant-current source CCX
Set end ISET, the current shape and amplitude of control switching constant-current source CCX.
The input terminal CI of invariable power compensation circuit CP is connected with voltage detection signal VO, generates one with voltage detection signal
VO changes and the thermal compensation signal CO of monotone variation, thermal compensation signal CO are connected to the second feedback end of feed circuit FB as output
IN2。
When alternating current VAC1 average value increases, thermal compensation signal CO controls the electricity of switchable current source CCX via feed circuit FB
Stream reduces, and the current average for flowing through alternating current VAC1 also reduces；Conversely, when alternating current VAC1 average value reduces, thermal compensation signal CO
Current average via feed circuit FB control switchable current source CCX increases, and the current average for flowing through alternating current VAC1 also increases
Greatly, realize that input power is relative constant in line voltage variation.
Invariable power compensation circuit CP also includes a control terminal CK, to change voltage detection signal VO to thermal compensation signal CO's
Carry-over factor.
The input of light adjusting circuit DIM is a variable signal DI, and output inhibits signal DO2 comprising a dim signal DO1 and one.
The third feedback end IN3 that dim signal DO1 is connected to feed circuit FB is controlled when variable signal DI changes by dim signal DO1
The electric current of the feedback signal of feed circuit FB processed, control switchable current source CCX changes；Signal DO2 is inhibited to be connected to invariable power benefit
The control terminal CK of circuit CP is repaid, influence of the voltage detection signal VO to feedback signal is controlled, when variable signal DI controls switching electricity
When the electric current of stream source CCX is gradually reduced, influence of the voltage detection signal VO to feedback signal gradually weakens, conversely, when variable letter
When the electric current of number DI control switchable current source CCX is gradually increased, influence of the voltage detection signal VO to feedback signal is gradually increased.
The input terminal PI of protection circuit PRO is connected with voltage detection signal VO, for detecting voltage detection signal VO, works as electricity
When the average value of pressure detection signal VO is lower than inner setting thresholding, circuit PRO output protection signal PO is protected, circuit PRO is protected
Output end PO and multiplier M input terminal MI2 be connected to control switchable current source CCX electric current as voltage detecting is believed
The decline of number VO and decline.
Fig. 2 is the circuit diagram of the switching constant-current source CCX of embodiment one.
As shown in Fig. 2, switching constant-current source CCX includes: several voltage-controlled current sources VCCS1, VCCS2 and VCCSX, and it is voltage-controlled
Current source one-to-one several signals bias source VOS1, VOS2 and VOSX, and inspection leakage resistance RCS.
Each voltage-controlled current source includes two power ends and two control terminals, and first of each voltage-controlled current source
Power end is all connected to inspection stream end CS, and inspection stream end CS is connected to publicly GND by examining leakage resistance RCS, and inspection stream end CS generates electricity
Flow signal.Second power end is respectively as several constant current output ends OUT1, OUT2 and OUTX.
First control terminal of each voltage-controlled current source is all connected to electric current setting end ISET.Second control terminal difference
It is connected with one end of several signal bias sources VOS1, VOS2 and VOSX, several signal bias sources VOS1, VOS2 and VOSX's
The other end is connected in parallel on the feedback that current signal is received on inspection stream end CS.
The signal amplitude of several signal bias source VOS1, VOS2 and VOSX is different, the maximum signal biasing of biasing amplitude
The constant current output end OUT1 of source VOS1 control is connected with the highest cathode node A1 of potential, the signal bias source that biasing amplitude is taken second place
The constant current output end OUT2 of VOS2 control is connected with the cathode node A2 that potential takes second place, and so on, bias the smallest letter of amplitude
The cathode node AX that the constant current output end OUTX of number bias source VOSX control is minimum with potential is connected.When alternating current VAC1 sine wave electricity
When pressing instantaneous value lower, when turn-on threshold lower than LED1, all flowed through without electric current on all voltage-controlled current sources；Work as alternating current
When VAC1 sine voltage instantaneous value reaches the turn-on threshold of LED1, there is electric current to flow through on LED1 and voltage-controlled current source VCCS1；When
When alternating current VAC1 sine voltage instantaneous value reaches the turn-on threshold of LED2, there is electricity on LED1, LED2 and voltage-controlled current source VCCS2
Stream flows through, and VCCS1 is because the biasing amplitude of signal bias source VOS1 is greater than signal bias source VOS2 and ends；And so on, when
When alternating current VAC1 sine voltage instantaneous value reaches the turn-on threshold of LEDX, LED1, LED2, LEDX and voltage-controlled current source VCCSX
On there is electric current to flow through, VCCS1 and VCCS2 are because the biasing amplitude of signal bias source VOS1 and VOS2 is greater than signal bias source VOSX
And end.
In the present invention, voltage-controlled current source VCCS1, VCCS2 and VCCSX all have higher gain, therefore voltage-controlled current source
For two control terminal signal differences of VCCS1, VCCS2 and VCCSX close to zero, electric current sets the signal of end ISET as close to sine wave
Signal, make the signal amplitude of VOS1, VOS2 and VOSX be far smaller than electric current setting end ISET signal amplitude, then VOS1,
The presence of VOS2 and VOSX has little influence on control precision of the signal to inspection stream end CS of electric current setting end ISET, flows end CS to inspection
Caused by wave distortion can almost ignore, so inspection stream end CS waveform close to sine wave, mains current is also close to sine wave.
Fig. 3 is the circuit diagram of the voltage detecting circuit VD of embodiment one.
As shown in figure 3, voltage detecting circuit VD includes: resistance RH and resistance RL.One after resistance RH and resistance RL series connection
End connection input terminal VI, the other end are linked to ground, output of the joint of resistance RH and resistance RL as voltage detecting circuit VD
Hold VO.
Resistance RH and resistance RL constitutes a resistor voltage divider network, the waveform of output end VO and the signal shape of input terminal VI
Shape is consistent, and input terminal VI is connected with the anode of rectifier bridge DB1 or is connected with the highest cathode node A1 of potential, can realize
The waveform of output end VO and the phase of line voltage waveform are consistent, and shape is similar.
Output end VO had not only reacted the voltage waveform of alternating current VAC1, but also had reacted the average voltage of alternating current VAC1.
Fig. 4 is the circuit diagram of the feed circuit FB of embodiment one.
As shown in figure 4, feed circuit FB includes error amplifier an AMP4, filter a F4, an adder SUM4 and one
Voltage reference V4.
The in-phase end of error amplifier AMP4 is grounded via voltage reference V4, the output phase of reverse side and adder SUM4
Even, the input terminal of adder SUM4 is connected to three feedback ends IN1, IN2 and IN3 of feed circuit FB, error amplifier
The output end of AMP4 is connected to the output FBO of feed circuit FB after filter F4 filtering.
Error amplifier AMP4 and filter F4 constitute error integrating circuit, to the output signal and electricity of adder SUM4
The difference between benchmark V4 is pressed to make integral output, according to negative-feedback principle, the output average value of control adder SUM4 is equal to electricity
Press benchmark V4.According to the difference that feedback end accesses, feed circuit FB has following operating mode:
In tri- input terminals of feed circuit FB, only the first feedback end IN1 is in use, the electric current of end CS is flowed in IN1 and inspection
Signal is connected, and feed circuit FB control current signal is constant, that is, the electric current for controlling switching constant-current source CCX is constant.
When the second feedback end IN2 of feed circuit FB is connected with the output of invariable power compensation circuit CP, switch constant-current source
The electric current of CCX is influenced the output by invariable power compensation circuit CP, and the effect of invariable power compensation circuit CP is realized in alternating current
Input power is relative constant when voltage change.
When third feedback end IN3 is connected with the output of light adjusting circuit DIM, the electric current for switching constant-current source CCX will be by DIM electricity
Road influences, and the effect of light adjusting circuit DIM is the adjusting realized to LED luminance.
In different performance requirements, three feedback ends of feed circuit FB can be used selectively.When to LED luminance
Stability requirement it is higher when, the first feedback end IN1 can be only used, the electric current of feed circuit FB control switching constant-current source CCX
Constant, system works in constant current mode；When the stability requirement to driving power input power is higher, then the second feedback end
The access of IN2 can make system work in constant power mode；When needing external signal that LED luminance is adjusted, just
Needing to access third feedback end IN3 makes system work in light-modulating mode.
Fig. 5 is the circuit diagram of the invariable power compensation circuit CP of embodiment one.
As shown in figure 5, invariable power compensation circuit CP is a multiplier.The input terminal of multiplier M5 is that invariable power is mended respectively
The input terminal CI and control terminal CK of circuit CP are repaid, output end is thermal compensation signal CO.
Input terminal CI is connected with voltage detection signal VO, and control terminal CK is connected with light adjusting circuit DIM, and output end CO is connected to
The second feedback end IN2 of feed circuit FB.
When control terminal CK signal amplitude is constant, thermal compensation signal CO is dull with the variation of voltage detection signal VO to be become
Change, when alternating current VAC1 average value increases, thermal compensation signal CO subtracts via the electric current of feed circuit FB control switchable current source CCX
Small, the current average for flowing through alternating current VAC1 also reduces；Conversely, when alternating current VAC1 average value reduce when, thermal compensation signal CO via
The current average that feed circuit FB controls switchable current source CCX increases, and the current average for flowing through alternating current VAC1 also increases, real
Input power is relative constant when present line voltage variation.
When control terminal CK signal amplitude reduces, the carry-over factor of input terminal CI to thermal compensation signal CO reduces, conversely, when control
When CK signal amplitude in end processed increases, the carry-over factor of input terminal CI to thermal compensation signal CO increases.Change the signal width of control terminal CK
Degree, thus it is possible to vary influence of the voltage detection signal VO to feed circuit FB feedback signal.
Fig. 6 is the circuit diagram of the light adjusting circuit DIM of embodiment one.
As shown in fig. 6, light adjusting circuit DIM has an input signal DI and two output signals.Two output signal difference
For dim signal DO1 and inhibit signal DO2.It include two amplifiers AMP5, AMP6 and a voltage reference inside light adjusting circuit DIM
V6.Wherein, the input terminal of amplifier AMP5 is connected with input signal DI, and output signal is to inhibit signal DO2.Amplifier AMP6's
Non-inverting input terminal is connected with the anode of voltage reference V6, the cathode ground connection of voltage reference V6, the inverting input terminal of amplifier AMP6
It is connected with input signal DI, output signal is dim signal DO1.
The external variable signal of input signal DI.
Dim signal DO1 is connected to the third feedback end IN3 of feed circuit FB, when variable signal increases, dim signal
DO1 reduces, and the electric current of control switchable current source CCX increases；Conversely, dim signal DO1 increases when variable signal reduces, control
The electric current of switchable current source CCX processed reduces.
Inhibit carry-over factor of the signal DO2 to control invariable power compensation circuit CP, when variable signal controls switching electric current
When the electric current of source CCX is gradually reduced, influence of the voltage detection signal VO to feedback signal gradually weakens, and system is from constant power mode
To constant current mode gradually transition；Conversely, when the electric current of variable signal control switchable current source CCX is gradually increased, voltage detecting
Influence of the signal VO to feedback signal gradually increases, and system is from constant current mode to constant power mode gradually transition.
Fig. 7 is the circuit diagram of the protection circuit PRO of embodiment one.
As shown in fig. 7, protection circuit PRO includes filter F7, amplifier AMP7, voltage reference V7 and transistor Q7.Filter
The input terminal of wave device F7 is connected to the input terminal PI of protection circuit PRO, the inverting input terminal phase of output end and amplifier AMP7
Even, the non-inverting input terminal of amplifier AMP7 is grounded via voltage reference V7, and output end is connected to the gate pole of transistor Q7, transistor
The source electrode of Q7 is grounded, and drain electrode is connected to the output end PO of protection circuit PRO.
The input terminal PI of protection circuit PRO is connected with voltage detection signal VO, for detecting voltage detection signal VO, exports
End PO is connected to the output end FBO of feed circuit FB.When voltage detection signal VO is lower than through the signal of filter F7 filtering output
When voltage reference V7, amplifier AMP7 drives the output end FBO voltage decline of transistor Q7 feedback control circuit FB, voltage detecting
Signal VO is lower, and the output end FBO voltage of feed circuit FB is also lower, finally makes the electric current of switchable current source CCX with voltage
It detects the decline of signal VO and declines.This to flow through the current reduction of LED when line voltage average value is lower, keep away
Exempt from the operation of LED overcurrent.
The action and effect of embodiment: can make mains-current waveform that the shape close to sine wave be presented, and have high power
The advantages of factor and low harmonics distortion；When mains fluctuation, the electric current realization input power of LED is flowed through by changing
Substantially invariable characteristic, and when line voltage average value is lower, the electric current for flowing through LED is reduced, LED overcurrent is avoided to transport
Row；When dimmer application, during turning down brightness, driving circuit is from constant power mode to constant current mode gradually transition, it is suppressed that
LED luminance caused by power network fluctuation changes when low-light level is applied.
Embodiment two
In embodiment two, in addition to protection circuit PRO structure and one different, other circuit structures and working principle phase of implementation
Together, it is not repeated to describe.
Fig. 8 is the circuit diagram of the protection circuit PRO of embodiment two.
As shown in figure 8, protection circuit PRO includes filter F8, amplifier AMP8 and transistor Q8.The input of filter F8
End is connected to the input terminal PI of protection circuit PRO, and output end is connected with the inverting input terminal of amplifier AMP8, amplifier AMP8
Output end be connected to the gate pole of transistor Q8, the source electrode ground connection of transistor Q8, the non-inverting input terminal and crystal of amplifier AMP8
The drain electrode of pipe Q8 is all connected to the output end PO of protection circuit PRO.
The input terminal PI of protection circuit PRO is connected with voltage detection signal VO, for detecting voltage detection signal VO, exports
End PO is connected to the output end FBO of feed circuit FB.When voltage detection signal VO is lower than through the signal of filter F8 filtering output
When the signal of the output end FBO of feed circuit FB, amplifier AMP8 drives the output end FBO of transistor Q8 feedback control circuit FB
Voltage is no more than the output signal of filter F8, and voltage detection signal VO is lower, and the output end FBO voltage of feed circuit FB is also got over
It is low, decline the electric current of switchable current source CCX with the decline of voltage detection signal VO.This makes flat in line voltage
When mean value is lower, the current reduction of LED is flowed through, LED overcurrent is avoided to run.
Embodiment three
In embodiment three, in addition to switching constant-current source CCX structure and one different, other circuit structures and working principle phase of implementation
Together, it is not repeated to describe.
Fig. 9 is the circuit diagram of the switching constant-current source CCX of embodiment three.
As shown in figure 9, by second control of each of switching constant-current source CCX circuit shown in Fig. 2 voltage-controlled current source
End be connected respectively with one end of several signal bias sources VOS1, VOS2 and VOSX, several signal bias source VOS1, VOS2 and
The other end of VOSX is all connected on electric current setting end ISET, then function identical with Fig. 2 may be implemented.
Example IV
In example IV, in addition to switching constant-current source CCX structure and one different, other circuit structures and working principle phase of implementation
Together, it is not repeated to describe.
Figure 10 is the circuit diagram of the switching constant-current source CCX of example IV.
As shown in Figure 10, by shown in Fig. 2 switching constant-current source CCX circuit in signal bias source VOS1, VOS2 and VOSX according to
It is connected respectively in the first control terminal of voltage-controlled current source VCCS1, VCCS2 and VCCSX, may be implemented and Fig. 2 phase after secondary series connection
Same function.
Embodiment five
In embodiment five, in addition to switching constant-current source CCX structure and one different, other circuit structures and working principle phase of implementation
Together, it is not repeated to describe.
Figure 11 is the circuit diagram of the switching constant-current source CCX of embodiment five.
As shown in figure 11, by shown in Fig. 2 switching constant-current source CCX circuit in signal bias source VOS1, VOS2 and VOSX according to
It is connected respectively in the second control terminal of voltage-controlled current source VCCS1, VCCS2 and VCCSX, may be implemented and Fig. 2 phase after secondary series connection
Same function.
On end, signal bias source still has other connection types, in all connection types, the effect of the signal bias source
It is all to keep the current setting value of each voltage-controlled current source VCCS1, VCCS2 and VCCSX different.Current setting value is biggish voltage-controlled
The constant current output end of current source is connected with the lower cathode node of potential, and the constant current of the lesser voltage-controlled current source of current setting value is defeated
Outlet is connected with the higher cathode node of potential, when having electric current on the constant current output end of the biggish voltage-controlled current source of current setting value
When flowing through, the constant current output end of the lesser voltage-controlled current source of current setting value is ended.
Embodiments above only describes the main feature and innovative point of this programme.Those skilled in the art should
Solution, this programme are not restricted to the described embodiments.Under the premise of not departing from the innovation point and protection scope, this programme is also had
Various change, these changes and improvements are fallen in the claimed range of this programme.The claimed range of this programme by
Appended claims and its equivalent limit.
It should be noted that above-described embodiment be in order to illustrate rather than limitation the present invention, those skilled in the art will
It is enough that many alternative embodiments are designed under conditions of without departing substantially from scope of the appended claims.Word "comprising" be not excluded for those with
The presence of the different element or step of the element or step listed in claim.Word "a" or "an" before element is not arranged
Except the presence of multiple this elements, in enumerating several circuit claims, several in these devices can be by one come table
Existing, hardware branch is also equally, merely because certain methods describe in different dependent claims, not illustrate these
The combination of method cannot be used to make a profit.
It should be noted that, in this document, the first and second equal relational terms be used merely to an entity or
Person's operation is distinguished with another entity or operation, is appointed without necessarily requiring or implying existing between these entities or operation
What this actual relationship perhaps sequence moreover, term "comprising", " comprising " or any other variant be intended to it is non-exclusive
Property includes, so that the process, method, article or equipment comprising a series of elements not only includes those elements, but also
Further include the other element that those are expressly recited, or further include for this process, method, article or equipment it is intrinsic
Element, term " connected ", " connection ", " being connected to " or other variants not only include being connected directly two entities,
It is connect including being indirectly connected by other entities with beneficial improvement.
Claims (15)
1. a kind of linear constant current driving circuit is powered by the rectified bridge DB1 of alternating current VAC1, loads and be sequentially connected in series for several LED,
Constitute an anode nodes and several LED cathode nodes；The input terminal of rectifier bridge DB1 is connected with alternating current VAC1, output cathode
It is connected with anode nodes, output negative pole ground connection；
It is characterized by comprising a switching constant-current source CCX, a voltage detecting circuit VD, a feed circuit FB and a multiplier M；
Wherein, switching constant-current source CCX includes the electric current setting end ISET of a setting switching constant current source current, one publicly GND, one
The inspection stream end CS of reaction switching constant current source current and several constant current output ends, several constant current output ends are negative with several respectively
Pole node is connected, and common is connected to ground；
Voltage detecting circuit detects line voltage waveform, the voltage detection signal VO of output and line voltage waveform same-phase；
Feed circuit FB includes a reference signal, at least one feedback end and an output end FBO, and feed circuit FB is at least one
Output end is output to after the difference-product point of signal summation acquisition feedback signal on a feedback end, the reference signal and feedback signal
FBO；
Inspection stream end CS is connected with the first feedback end IN1 of feed circuit FB, and the current signal that inspection stream end CS is generated is controlled by feedback
Circuit FB；
Multiplier M includes that two input terminals MI1, MI2 and an output end MO, input terminal MI1 are connected with voltage detection signal VO,
The signal shape of multiplier M output end MO is controlled, input terminal MI2 is connected with the output end FBO of feed circuit FB, controls multiplier
The signal amplitude of M output end MO, the output end MO of multiplier M are connected to the electric current setting end ISET of switching constant-current source CCX, control
Switch the current shape and amplitude of constant-current source CCX；
It further include an invariable power compensation circuit CP；
Invariable power compensation circuit CP input terminal CI detect voltage detection signal VO, generate one with voltage detection signal VO change and
The thermal compensation signal CO of monotone variation；
Thermal compensation signal CO is connected to the second feedback end IN2 of feed circuit FB.
2. linear constant current driving circuit according to claim 1, it is characterised in that: invariable power compensation circuit CP also includes one
Control terminal CK.
3. linear constant current driving circuit according to claim 2, it is characterised in that: also include a light adjusting circuit DIM；
The input of light adjusting circuit DIM is a variable signal DI, and output inhibits signal DO2 comprising a dim signal DO1 and one；
Dim signal DO1 is connected to the third feedback end IN3 of feed circuit FB；When variable signal DI changes, pass through dim signal
The electric current that DO1 controls switchable current source CCX changes；
Inhibit signal DO2 to be connected to the control terminal CK of invariable power compensation circuit CP, controls voltage detection signal VO to feedback signal
Influence.
4. linear constant current driving circuit according to claim 1, it is characterised in that: also include a light adjusting circuit DIM；
The input of light adjusting circuit DIM is a variable signal DI, and output includes a dim signal DO1；
Dim signal DO1 is connected to the third feedback end IN3 of feed circuit FB；When variable signal DI changes, pass through dim signal
The electric current that DO1 controls switchable current source CCX changes.
5. linear constant current driving circuit according to claim 1, it is characterised in that: also comprising a protection circuit PRO；
It protects comprising a setting thresholding inside circuit PRO, protection circuit PRO input terminal PI detects voltage detection signal VO, works as electricity
When pressure detection signal VO average value is lower than setting thresholding, protection circuit output protects signal PO, controls the electricity of switchable current source CCX
Stream declines with the decline of voltage detection signal VO.
6. linear constant current driving circuit according to claim 1, it is characterised in that: also comprising a protection circuit PRO；
It protects circuit PRO input terminal PI to detect voltage detection signal VO, it is proportional to voltage detection signal VO average value to generate one
Clipping thresholding, the output signal FBO of feedback control circuit FB is no more than clipping thresholding.
7. linear constant current driving circuit according to claim 1-6, it is characterised in that: invariable power compensation circuit
The input terminal of input terminal, the first input end of multiplier and protection circuit is connected to the output end of a voltage detecting circuit.
8. linear constant current driving circuit according to claim 1-6, it is characterised in that: invariable power compensation circuit
The input terminal of input terminal, the first input end of multiplier and protection circuit is connected to the same output an of voltage detecting circuit
End.
9. linear constant current driving circuit according to claim 1-6, it is characterised in that: switching constant-current source CCX packet
Leakage resistance RCS is examined containing several voltage-controlled current sources, with several one-to-one signal bias sources of voltage-controlled current source and one；
Each of several voltage-controlled current sources voltage-controlled current source includes two control terminals and two power ends, described each
First power end of a voltage-controlled current source is all connected to inspection stream end CS, and inspection stream end CS is connected to public by inspection leakage resistance RCS
Ground, second power end connect respectively as several constant current output ends, first control terminal of each voltage-controlled current source
It is connected to electric current setting end ISET, second control terminal is connected to inspection stream end CS through corresponding signal bias source.
10. linear constant current driving circuit according to claim 9, it is characterised in that: several described signal bias sources make
Potential in second control terminal is different, in second control terminal the constant current output end of the higher voltage-controlled current source of potential with
The higher cathode node of potential is connected, in second control terminal the constant current output end of the lower voltage-controlled current source of potential and potential compared with
Low cathode node is connected.
11. linear constant current driving circuit according to claim 1-6, it is characterised in that: switching constant-current source CCX packet
Leakage resistance RCS is examined containing several voltage-controlled current sources, with several one-to-one signal bias sources of voltage-controlled current source and one；
Each of several voltage-controlled current sources voltage-controlled current source includes two control terminals and two power ends, described each
First power end of a voltage-controlled current source is all connected to inspection stream end CS, and inspection stream end CS is connected to public by inspection leakage resistance RCS
Ground, second power end are passed through respectively as several constant current output ends, first control terminal of each voltage-controlled current source
Corresponding signal bias source is connected to electric current setting end ISET, and second control terminal is connected to inspection stream end CS.
12. linear constant current driving circuit according to claim 11, it is characterised in that: several described signal bias sources make
Potential in first control terminal of several voltage-controlled current sources is different, the higher voltage-controlled electricity of potential in first control terminal
The constant current output end in stream source is connected with the lower cathode node of potential, the lower voltage-controlled current source of potential in first control terminal
Constant current output end is connected with the higher cathode node of potential.
13. linear constant current driving circuit according to claim 1-6, it is characterised in that: switching constant-current source CCX packet
Leakage resistance RCS is examined containing several voltage-controlled current sources, with several one-to-one signal bias sources of voltage-controlled current source and one；
Each of several voltage-controlled current sources voltage-controlled current source includes two control terminals and two power ends, described each
First power end of a voltage-controlled current source is all connected to inspection stream end CS, and inspection stream end CS is connected to public by inspection leakage resistance RCS
Ground, second power end is respectively as several constant current output ends；
Described two control terminals are respectively the current reference signal and current feedback signal of voltage-controlled current source, and the difference between the two is to control
Make the current value of the voltage-controlled current source；
The offset signal source keeps the current setting value of the voltage-controlled current source different, the biggish voltage-controlled electricity of current setting value
The corresponding constant current output end in stream source is connected with the lower cathode node of potential, and the lesser voltage-controlled current source of current setting value is corresponding
Constant current output end is connected with the higher cathode node of potential.
14. linear constant current driving circuit according to claim 1, it is characterised in that: the input terminal of voltage detecting circuit VD
The cathode voltage signal of VI detection rectifier bridge DB1.
15. linear constant current driving circuit according to claim 1, it is characterised in that: the input terminal of voltage detecting circuit VD
The voltage signal of the VI detection highest cathode node of potential.
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| CN201610323004.2A CN107396481B (en) | 2016-05-16 | 2016-05-16 | A kind of linear constant current driving circuit |
| PCT/CN2017/084334 WO2017198126A1 (en) | 2016-05-16 | 2017-05-15 | Linear constant-current drive circuit |
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| CN201610323004.2A CN107396481B (en) | 2016-05-16 | 2016-05-16 | A kind of linear constant current driving circuit |
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| CN108566702B (en) * | 2018-06-29 | 2024-02-27 | 宁波伟依特照明电器有限公司 | LED linear driving circuit |
| CN110012573A (en) * | 2019-04-04 | 2019-07-12 | 深圳市明微电子股份有限公司 | A kind of full voltage control circuit |
| CN110505733A (en) * | 2019-08-14 | 2019-11-26 | 深圳市晟碟半导体有限公司 | LED control circuit, device and the control method of compatible silicon controlled light modulator |
| CN112770445B (en) * | 2021-01-29 | 2023-08-29 | 漳州立达信光电子科技有限公司 | Full-period constant-power load driving system |
| CN114995568B (en) * | 2022-07-11 | 2023-11-17 | 苏州华芯半导体科技有限公司 | Current source with negative linear rate adjustment rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014131202A1 (en) * | 2013-02-28 | 2014-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit with double boost lines |
| CN104066253A (en) * | 2014-07-08 | 2014-09-24 | 昂宝电子（上海）有限公司 | Light modulation control system and method using TRIAC light modulator |
| CN105208750A (en) * | 2015-10-28 | 2015-12-30 | 四川新力光源股份有限公司 | LED constant current driving device |
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| CN101616524B (en) * | 2009-07-29 | 2012-11-28 | 广州复旦奥特科技股份有限公司 | Commercial LED illumination driver |
| CN105472810B (en) * | 2015-12-15 | 2017-10-31 | 上海飞乐音响股份有限公司 | A kind of device that LED constant current source output current value is adjusted by magnetisable material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014131202A1 (en) * | 2013-02-28 | 2014-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit with double boost lines |
| CN104066253A (en) * | 2014-07-08 | 2014-09-24 | 昂宝电子（上海）有限公司 | Light modulation control system and method using TRIAC light modulator |
| CN105208750A (en) * | 2015-10-28 | 2015-12-30 | 四川新力光源股份有限公司 | LED constant current driving device |
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