CN106332362B - A kind of high-voltage linear LED control circuit reducing harmonic wave - Google Patents
A kind of high-voltage linear LED control circuit reducing harmonic wave Download PDFInfo
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- CN106332362B CN106332362B CN201610834996.5A CN201610834996A CN106332362B CN 106332362 B CN106332362 B CN 106332362B CN 201610834996 A CN201610834996 A CN 201610834996A CN 106332362 B CN106332362 B CN 106332362B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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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Abstract
This disclosure relates to a kind of high-voltage linear LED control circuit for reducing harmonic wave, the control circuit includes bleeder circuit, drive control circuit and sampling resistor.Wherein, bleeder circuit provides reference voltage to drive control circuit, and the reference voltage waveform is consistent with the on-load voltage waveform of LED light string input terminal.When the on-load voltage at LED light string both ends is greater than the conducting voltage of LED light string, the drive control circuit being connected with LED light string is connected, and the current waveform for flowing through LED light string is consistent with the current waveform of sampling resistor；And sampling resistor on-load voltage is identical as the reference voltage, therefore the current waveform for flowing through LED light string is consistent with input voltage waveform, to reduce harmonic wave influence.
Description
Technical field
This disclosure relates to which LED illumination control technology field more particularly to a kind of high-voltage linear LED for dropping harmonic wave control electricity
Road.
Background technique
There are many form, no electrolytic capacitor high-voltage lines for high-voltage linear LED light cascade control circuit currently on the market and method
Property constant current driving method and driving chip be one of them, this actuation techniques power factor is high, small in size, at low cost, reliable
Property it is high；Mainly using when the voltage at LED light string both ends is more than LED conducting voltage, LED light string is flowed through in LED light string conducting
Electric current is a constant, but in the case where there is electrolytic capacitor energy storage, the voltage for being added in LED light string both ends has waveform variation, electric current
Staircase waveform and voltage semisinusoidal wave distortion it is serious, it is very big thus to will form harmonic wave, is not able to satisfy the general mark of illumination
It is quasi-.
Therefore, the harmonic wave for fundamentally reducing LED light string is a problem to be solved.
Summary of the invention
In view of the above-mentioned problems, present disclose provides it is a kind of reduce harmonic wave high-voltage linear LED control circuit, by provide with
The reference voltage of LED light string on-load voltage variation utilizes the controllable electricity for flowing through LED light string of the reference voltage combination sampling resistor
Flow size also just makes the current waveform and LED light string defeated to keep the current waveform of LED light string consistent with reference voltage waveform
The on-load voltage waveform for entering end is consistent, thereby reduces harmonic wave.
In order to solve the above-mentioned technical problem, the application adopts the following technical scheme that
A kind of high-voltage linear LED control circuit reducing harmonic wave, the control circuit include bleeder circuit, drive control electricity
Road, sampling resistor, in which:
The control circuit includes bleeder circuit, drive control circuit, sampling resistor, in which: the bleeder circuit is to drive
Dynamic control circuit provides reference voltage, and the reference voltage waveform is consistent with the on-load voltage waveform of LED light string input terminal；It is described
Reference voltage flows through the electric current of LED light string in conjunction with sampling resistor control；When the on-load voltage is greater than the conducting of LED light string
When voltage, the drive control circuit conducting passes through the current waveform of LED light string and the load electricity of LED light string input terminal
Corrugating is consistent, reduces harmonic wave.
Preferably, the LED light string includes a string of lamp strings；The drive control circuit includes control terminal, input terminal, output
End；The bleeder circuit includes the 1st divider resistance, the 2nd divider resistance, and electric current flows to the 2nd divider resistance from the 1st divider resistance,
The voltage of two resistance joints is reference voltage；The reference voltage is connected with the control terminal of drive control circuit；Described 1st
The current input terminal of divider resistance, the input terminal of drive control circuit are connected with the both ends of the LED light string respectively；The driving
The output end of control circuit, the 2nd divider resistance current output terminal be connected respectively with the both ends of sampling resistor.
Preferably, the LED light string includes N sections of concatenated substrings, wherein N is the integer greater than 1；The drive control
The number of circuit is N group, and each drive control circuit includes control terminal, input, output end；The bleeder circuit includes string
N+1 divider resistance of connection, electric current are flowed into from the 1st divider resistance, are flowed out from N+1 divider resistance, and electric from the 1st partial pressure
The current output terminal of the current output terminal of resistance to n-th divider resistance is provided with N number of reference voltage；The paragraph 1 of the LED light string
The both ends of substring are connected with the input terminal of the current input terminal of the 1st divider resistance, the 1st group of drive control circuit respectively；1st partial pressure
Resistance is connected with the tie point of the 2nd divider resistance with the control terminal of N group drive control circuit, to N group drive control circuit
Reference voltage is provided；It is driven respectively with the current output terminal of -1 cross-talk string of I, Group I at the I cross-talk string both ends of the LED light string
The input terminal of dynamic control circuit is connected；The tie point and N-I+1 group drive control of I divider resistance and+1 divider resistance of I
The control terminal of circuit is connected, and provides reference voltage to N-I+1 group drive control circuit, wherein 1 < I≤N, I is integer；N
The output end of+1 divider resistance is connected with one end of the sampling resistor, and the other end of the sampling resistor and all N groups drive
The output end of control circuit is connected.
Preferably, the drive control circuit includes voltage follower and driving switch pipe；The driving switch pipe it is defeated
Enter the input terminal that end is drive control circuit, the output end of the driving switch pipe is the output end of drive control circuit；It is described
The control terminal of driving switch pipe is connected with the output end of voltage follower；The voltage follower reverse input end and driving switch
The output end of pipe is connected；The positive input of the voltage follower accesses reference voltage, is the control terminal of drive control circuit.
Preferably, the control circuit includes the first bleeder circuit, the second bleeder circuit, drive control circuit, sampling electricity
Resistance, in which: first bleeder circuit provides operating voltage to the second bleeder circuit；Second bleeder circuit is to drive control
Circuit provides reference voltage, and the reference voltage waveform is consistent with the on-load voltage waveform of LED light string input terminal；The reference electricity
Press the electric current that LED light string is flowed through in conjunction with sampling resistor control；The drive control circuit and second bleeder circuit are set
It sets in the chips；When the on-load voltage is greater than the conducting voltage of LED light string, the drive control circuit conducting, so that stream
Current waveform through LED light string is consistent with the on-load voltage waveform of LED light string input terminal, reduces harmonic wave.
Preferably, the LED light string includes a string of lamp strings；The drive control circuit includes control terminal, input terminal, output
End；The bleeder circuit includes the first bleeder circuit, the second bleeder circuit, in which: second bleeder circuit includes concatenated
1st divider resistance and the 2nd divider resistance, electric current flow to the 2nd divider resistance, the 2nd divider resistance ground connection from the 1st divider resistance；Institute
Stating the first bleeder circuit includes concatenated 3rd divider resistance and the 4th divider resistance, and electric current flows to the 4th partial pressure from the 3rd divider resistance
Resistance；The tie point of 3rd divider resistance and the 4th divider resistance is connected with the current input terminal of the 1st divider resistance；Described
1 divider resistance and the 2nd divider resistance junction are connected with the control terminal of drive control circuit, provide reference to drive control circuit
Voltage；The current input terminal of 3rd divider resistance, the drive control circuit input terminal respectively with the LED light string
Both ends are connected；The output end of the drive control circuit, the 4th divider resistance current output terminal respectively with the both ends of sampling resistor
It is connected.
Preferably, the LED light string includes N sections of concatenated substrings, wherein N is the integer greater than 1；The drive control
The number of circuit is N group, and each drive control circuit includes control terminal, input, output end；The bleeder circuit includes the
One bleeder circuit, the second bleeder circuit, in which: second bleeder circuit includes concatenated N+1 divider resistance, and electric current is from
1 divider resistance flows into, and flows out from the N+1 divider resistance, and the N+1 divider resistance is grounded, and from the 1st divider resistance
The current output terminal of current output terminal to n-th divider resistance is provided with N number of reference voltage；First bleeder circuit includes string
The N+2 divider resistance and N+3 divider resistance of connection, electric current flow to N+3 divider resistance from N+2 divider resistance；The N
The tie point of+2 divider resistances and N+3 divider resistance is connected with the current input terminal of the 1st divider resistance；The LED light string
The both ends of paragraph 1 substring are connected with the input terminal of the current input terminal of N+2 divider resistance, the 1st group of drive control circuit respectively；
1st divider resistance is connected with the tie point of the 2nd divider resistance with the control terminal of N group drive control circuit, drives to N group
Dynamic control circuit provides reference voltage；The both ends of the I cross-talk string of the LED light string are defeated with the electric current of -1 cross-talk string of I respectively
Outlet, the output end of Group I drive control circuit are connected；The tie point and N-I+ of I divider resistance and+1 divider resistance of I
The control terminal of 1 group of drive control circuit is connected, and provides reference voltage to N-I+1 group drive control circuit, wherein 1 < I≤N,
I is integer；The output end of N+3 divider resistance is connected with one end of the sampling resistor, the other end of the sampling resistor with
The output end of all N group drive control circuits is connected.
Preferably, the drive control circuit includes voltage follower and driving switch pipe；The driving switch pipe it is defeated
Enter the input terminal that end is drive control circuit, the output end of the driving switch pipe is the output end of drive control circuit；It is described
The control terminal of driving switch pipe is connected with the output end of voltage follower；The voltage follower reverse input end and driving switch
The output end of pipe is connected；The positive input of the voltage follower accesses reference voltage, is the control terminal of drive control circuit.
Preferably, the chip includes excess temperature compensation circuit.
To sum up, the control circuit that the disclosure provides is loaded by flowing through the current waveform variation of LED light string with it
Voltage waveform variation it is consistent, overcome the disadvantage of current step waveform and voltage smooth waveform dissmilarity in the prior art, drop
The Resonance Wave Composition of electric current in low LED light string.
Detailed description of the invention
High-voltage linear LED control circuit schematic diagram in Fig. 1 an embodiment of the present disclosure about drop harmonic wave；
About the voltage waveform of LED light string anode and the current waveform for flowing through LED light string in Fig. 2 an embodiment of the present disclosure
Schematic diagram；
About the control circuit schematic diagram of multistage LED light string in Fig. 3 an embodiment of the present disclosure；
About the voltage waveform of multistage LED light string anode and the electric current for flowing through LED light string in Fig. 4 an embodiment of the present disclosure
Waveform diagram；
About the control circuit signal for the multistage LED light string for including two bleeder circuits in Fig. 5 an embodiment of the present disclosure
Figure；
Fig. 6 is by the second bleeder circuit in Fig. 5 and the schematic diagram after drive control circuit integrated chip.
Specific embodiment
In one embodiment, providing the first reduces the high-voltage linear LED control circuit of harmonic wave, the control circuit
Including bleeder circuit, drive control circuit, sampling resistor, in which: the bleeder circuit is provided to drive control circuit with reference to electricity
Pressure, the reference voltage waveform are consistent with the on-load voltage waveform of LED light string input terminal；The reference voltage is in conjunction with the sampling
Resistance controls the electric current for flowing through LED light string；When the on-load voltage is greater than the conducting voltage of LED light string, the drive control
Circuit conducting, the current waveform for passing through LED light string is consistent with the on-load voltage waveform of LED light string input terminal, reduces harmonic wave.
In this embodiment, the resistance in bleeder circuit and sampling resistor are definite value, bleeder circuit waveform and LED light
It is identical to serially add load voltage waveform.Voltage in bleeder circuit between two neighboring resistance is reference voltage, when bleeder circuit inputs
When holding the voltage change of load, reference voltage also synchronous variation therewith.Due to the voltage and reference voltage phase of sampling resistor load
Together, then the current waveform in sampling resistor is consistent with reference voltage waveform, and when drive control circuit conducting, flow through LED light
The electric current of string and the electric current of sampling resistor are identical, thus the current waveform for flowing through LED light string it is consistent with reference voltage waveform to get
It is consistent with the on-load voltage waveform of bleeder circuit input terminal to the current waveform for flowing through LED light string, it has also just obtained flowing through LED light
The current waveform of string is consistent with its on-load voltage waveform, to reduce distortion, reduces harmonic wave, meets the illumination universal standard.
The first above-mentioned control circuit can be realized using following circuit connection structures, it may be assumed that the LED light string includes a string
Lamp string；The drive control circuit includes control terminal, input, output end；The bleeder circuit includes the 1st divider resistance, the 2nd
Divider resistance, electric current flow to the 2nd divider resistance from the 1st divider resistance, and the voltage of two resistance joints is reference voltage；It is described
Reference voltage is connected with the control terminal of drive control circuit；The current input terminal of 1st divider resistance, drive control circuit
Input terminal is connected with the both ends of the LED light string respectively；The electric current of the output end of the drive control circuit, the 2nd divider resistance
Output end is connected with the both ends of sampling resistor respectively.
In above-mentioned connection type, only one LED light string, thus only need a drive control circuit.In this situation
Under, the both ends of LED light string are connected with the input terminal of the input terminal of bleeder circuit, drive control circuit respectively.When LED light string both ends
On-load voltage when being greater than its conducting voltage, drive control circuit conducting has electric current to flow through in LED light string；Conversely, drive control
Circuit disconnects, and electric current is zero in LED light string.
The first above-mentioned control circuit can also be realized using following circuit connection structures, it may be assumed that the LED light string includes N
The concatenated substring of section, wherein N is the integer greater than 1；The number of the drive control circuit is N group, each drive control circuit
It include control terminal, input, output end；The bleeder circuit includes concatenated N+1 divider resistance, and electric current is divided from the 1st
Resistance flows into, and flows out from N+1 divider resistance；N number of reference voltage is taken respectively from the current output terminal of the 1st divider resistance to
The current output terminal of N number of divider resistance；The both ends of the paragraph 1 substring of the LED light string are defeated with the electric current of the 1st divider resistance respectively
Enter end, the input terminal of the 1st group of drive control circuit is connected；The tie point and N group of 1st divider resistance and the 2nd divider resistance drive
The control terminal of dynamic control circuit is connected, and provides reference voltage to N group drive control circuit；2nd divider resistance and the 3rd partial pressure electricity
The tie point of resistance is connected with the control terminal of N-1 group drive control circuit, provides to N-1 group drive control circuit with reference to electricity
Pressure；The I cross-talk string both ends of the LED light string respectively with the current output terminal of -1 cross-talk string of I, Group I drive control circuit
Input terminal be connected；I divider resistance and the tie point of+1 divider resistance of I and the control of N-I+1 group drive control circuit
End is connected, and provides reference voltage to N-I+1 group drive control circuit, wherein 1 < I≤N, I is integer；N+1 divider resistance
Output end be connected with one end of the sampling resistor, the other end of the sampling resistor and all N group drive control circuits
Output end is connected.
In this connection structure, LED light string is connected in series by multistage substring, and each substring includes at least a LED light
Pearl.Correspondingly, there is N group drive control circuit, each substring connects respective drive control circuit.Bleeder circuit is each driving
The control terminal of control circuit provides a reference voltage, and each reference voltage value is different.The output end of every section of LED light string with one
The input terminal of drive control circuit is connected, and the entire input terminal of LED light string is connected with the input terminal of bleeder circuit.Any one
Drive control circuit conducting, one or more snippets LED substring between input terminal and bleeder circuit input terminal are connected.With load
Voltage swing in whole string LED light string changes, and N group drive control circuit is sequentially turned on or disconnected, and in a time
In section, the conducting of only one drive control circuit, remaining drive control circuit is disconnected, so that LED light string is led on-off paragraph by paragraph
It opens.
Wherein, the input terminal of sampling resistor is connected with the output end of N group drive control circuit, the output of the sampling resistor
End is connected with the current output terminal of N+1 divider resistance.Load electricity when any group of drive control circuit conducting, on sampling resistor
Pressure is equal to the reference voltage being connected with the drive control circuit, and the electric current of the LED substring of conducting is equal to and the drive control circuit
The ratio of connected reference voltage and sampling resistor.In the case where sampling resistor determines, flow through the electric current of LED substring by with this
The connected reference voltage of drive control circuit determines, when reference voltage waveform is consistent with the voltage waveform of LED light string, flows through
The electric current of LED substring is just consistent with the voltage waveform of LED light string.Therefore, the resistance value of divider resistance is adjusted to adjust reference voltage,
When the difference between two neighboring reference voltage is smaller, the electric current smoothness for flowing through LED light string is higher.
In one embodiment, second of control circuit is provided, the control circuit includes the first bleeder circuit, second
Bleeder circuit, drive control circuit, sampling resistor, in which: first bleeder circuit provides work electricity to the second bleeder circuit
Pressure；Second bleeder circuit provides reference voltage, the reference voltage waveform and LED light string input terminal to drive control circuit
On-load voltage waveform it is consistent；The reference voltage combination sampling resistor control flows through the electric current of LED light string；The drive control
Circuit and second bleeder circuit setting are in the chips；It is described when the on-load voltage is greater than the conducting voltage of LED light string
Drive control circuit conducting, the current waveform for passing through LED light string is consistent with the on-load voltage waveform of LED light string input terminal,
Reduce harmonic wave.
In this embodiment, bleeder circuit is further divided into the first bleeder circuit, the second bleeder circuit, by the second partial pressure
Circuit and drive control circuit are integrated in the chips, and the first bleeder circuit can be determined and be closed according to specific LED light string situation
Suitable partial pressure resistance value and sampling resistor resistance value, and the pin of chip can be reduced, reference voltage input need to be only arranged in chip
The variable voltage input terminal at end, sampling resistor connecting pin, at least one LED light string connecting pin and bleeder circuit.Preferably,
It further include excess temperature compensation circuit in chip to extend the service life of chip.
Above-mentioned second of control circuit can take following physical circuit connection structures, it may be assumed that the LED light string includes a string
Lamp string；The drive control circuit includes control terminal, input, output end；The bleeder circuit includes the first bleeder circuit, the
Two bleeder circuits, in which: the second bleeder circuit includes concatenated 1st divider resistance and the 2nd divider resistance, and electric current is divided from the 1st
Resistance flows to the 2nd divider resistance, the 2nd divider resistance ground connection；First bleeder circuit includes concatenated 3rd divider resistance and the 4th point
Piezoresistance, electric current flow to the 4th divider resistance from the 3rd divider resistance；The tie point and the 1st of 3rd divider resistance and the 4th divider resistance
The current input terminal of divider resistance is connected；The control terminal of 1st divider resistance and the 2nd divider resistance junction and drive control circuit
It is connected, provides reference voltage to drive control circuit；The current input terminal of 3rd divider resistance, the drive control circuit
Input terminal be connected respectively with the both ends of the LED light string；The electricity of the output end of the drive control circuit, the 4th divider resistance
Stream output end is connected with the both ends of sampling resistor respectively.
Above-mentioned second control circuit can also use following specific connection structures, it may be assumed that the LED light string includes N sections of series connection
Substring, wherein N is integer greater than 1；The number of the drive control circuit is N group, and each drive control circuit includes
Control terminal, input, output end；The bleeder circuit includes the first bleeder circuit, the second bleeder circuit, in which: described second
Bleeder circuit includes concatenated N+1 divider resistance, and electric current is flowed into from the 1st divider resistance, is flowed out from the N+1 divider resistance,
The N+1 divider resistance ground connection；First bleeder circuit includes concatenated N+2 divider resistance and N+3 divider resistance, electricity
Stream flows to N+3 divider resistance from N+2 divider resistance；The tie point of the N+2 divider resistance and N+3 divider resistance with
The current input terminal of 1st divider resistance is connected；The both ends of the paragraph 1 substring of the LED light string respectively with N+2 divider resistance
Current input terminal, the input terminal of the 1st group of drive control circuit are connected；The tie point of 1st divider resistance and the 2nd divider resistance
It is connected with the control terminal of N group drive control circuit, provides reference voltage to N group drive control circuit；2nd divider resistance with
The tie point of 3rd divider resistance is connected with the control terminal of N-1 group drive control circuit, mentions to N-1 group drive control circuit
Supply reference voltage；It is driven respectively with the current output terminal of -1 cross-talk string of I, Group I at the both ends of the I cross-talk string of the LED light string
The output end of dynamic control circuit is connected；The tie point and N-I+1 group drive control of I divider resistance and+1 divider resistance of I
The control terminal of circuit is connected, and provides reference voltage to N-I+1 group drive control circuit, wherein 1 < I≤N, I is integer；N
The output end of+3 divider resistances is connected with one end of the sampling resistor, and the other end of the sampling resistor and all N groups drive
The output end of control circuit is connected.
In one embodiment, it for the drive control circuit in the first control circuit and second of control circuit, mentions
A kind of specific connection type is supplied, it may be assumed that the drive control circuit includes voltage follower and driving switch pipe；The voltage with
It is connected with the output end of device with the control terminal of driving switch pipe；The positive input of the voltage follower accesses reference voltage,
For the control terminal of drive control circuit；The voltage follower reverse input end is connected with the output end of driving switch pipe, to drive
The output end of dynamic control circuit；The input terminal of the driving switch pipe is the input terminal of drive control circuit.Wherein: the driving
Switching tube can be NMOS tube, PMOS tube, NPN triode, PNP triode.
Following example combination attached drawing 1-6 is illustrated.
In one embodiment, the connection type and application of a kind of control circuit as shown in Figure 1 are provided, in the control
In circuit, control circuit includes bleeder circuit, drive control circuit and sampling resistor.The both ends of bleeder circuit and rectification circuit
Both ends are connected.Control circuit controls the conducting and disconnection of a LED light string.Bleeder circuit includes two concatenated divider resistances,
Respectively R1 and R2, electric current are flowed into from the one end R1, are flowed out from one end of R2.Drive control circuit include voltage follower circuit VP1,
Driving switch pipe M1.Wherein, the current input terminal of resistance R1 is connected with one end of LED light string, the other end of LED light string and driving
The input terminal of switching tube M1 is connected.The positive input of the tie point connection voltage follower circuit VP1 of resistance R1, R2, resistance R2
Voltage output end be connected with one end of sampling resistor R3, the output end of the other end of sampling resistor R3 and driving switch pipe M1,
The reverse input end of voltage follower circuit VP1 is connected.The output of the control terminal connection voltage follower circuit VP1 of driving switch pipe M1
End.When the voltage change of voltage follower circuit VP1 positive input, the voltage of reverse input end also and then changes.
Fig. 2 illustrates the waveform that LED light string electric current I is flowed through in Fig. 1, and load in the wave of LED light string input terminal voltage V
Shape.Wherein, the voltage that voltage is alternating current after rectification circuit W rectification, and the reference voltage VB waveform on bleeder circuit
Also identical as rectified voltage waveform.
At the t1 moment, the voltage for being added in LED light string input terminal is VA, and the voltage in LED light string is more than LED light string at this time
Conducting voltage, driving switch pipe M1 conducting, driving switch pipe M1 are equivalent to a resistance, and the electric current I for flowing through LED light string is opened from zero
Beginning slowly increases, and the electric current I1 for flowing through LED light string can be calculate by the following formula:
Due to VS=VB, so flowing through the electric current I of LED light string:
Therefore reference voltage is adjusted by the resistance value of change divider resistance or changes the resistance value of sampling resistor, it can control
Flow through the electric current of LED light string.In the case where divider resistance and certain sampling resistor, as rectified voltage increases, LED light is flowed through
The electric current of string also increases, and when voltage reaches maximum, the electric current for flowing through LED light string is also maximum, when voltage reduces, flows through LED
The electric current of lamp string also reduces；Electric current is with voltage smooth change, and at the t2 moment, the voltage being added in LED light string is less than LED light string
Conducting voltage, driving switch pipe M1 shutdown, the electric current of LED light string is zero.In next moment t3, process above-mentioned is repeated.From
Fig. 2 can be seen that the electric current for flowing through LED light string and load is similar in LED light string input terminal voltage waveform, overcome the prior art
The disadvantage of middle current step waveform and voltage smooth waveform dissmilarity, to reduce the Resonance Wave Composition of electric current in LED light string.
In one embodiment, the control circuit connection of the LED light string as shown in Figure 3 being made of multiple substrings is provided
Mode and application, every section of working principle is consistent with Fig. 1, only Discrete control.In the figure, bleeder circuit by R1, R2, R3,
Multiple resistance compositions such as R4, R5, provide multiple reference voltage VB, VC, VD, VE, each reference voltage changes with rectified voltage, when whole
When galvanic electricity pressure increases, reference voltage also increases, the positive input terminal of one voltage follower circuit of each reference voltage connection, and each section
LED light string L11, L22, L33, L44 are connected in series, and every section of LED light string connects respective drive control circuit, the drive of L11 lamp string
Dynamic control circuit includes that the drive control circuit of driving switch pipe M11 and voltage follower circuit VP11, L22 lamp string includes that driving is opened
The drive control circuit for closing pipe M22 and voltage follower circuit VP22, L33 lamp string includes driving switch pipe M33 and voltage follow electricity
The drive control circuit of road VP33, L44 lamp string includes driving switch pipe M44 and voltage follower circuit VP44, each drive control electricity
The connection type on road is identical, i.e., the positive input terminal of voltage follower circuit connects reference voltage, and negative input end connects sampling resistor R6
With the output end of driving switch pipe, the output end of voltage follower circuit connects the control terminal of driving switch pipe, driving switch pipe
Input terminal connects the negative terminal of LED light string, and each LED light string is connected in series.Voltage follower circuit VP11 connection reference voltage VE, voltage
Circuit VP22 connection reference voltage VD, voltage follower circuit VP33 connection reference voltage VC, voltage follower circuit VP44 is followed to connect
Reference voltage VB is met, such connection type, when keeping the voltage of LED light string input terminal smaller, first segment LED light string is connected, with
The voltage of LED light string input terminal be gradually increased, second segment, third section, the 4th section of LED light string sequentially turn on, when voltage maximum
The LED light string of Shi Suoyou is connected, and then when voltage reduces, each LED light string is successively turned off；L11, L22, L33, L44 points in figure
It Dai Biao not include the LED light string of at least one LED lamp bead.
When Fig. 4 illustrates LED light string conducting in Fig. 3, the on-load voltage of LED light string input terminal and the current waveform for flowing through it
Figure.At the t1 moment, rectified voltage is greater than the conducting voltage of LED light string L11, and driving switch pipe M11 is connected, and flows in LED light string L11
The electric current crossed is started from scratch and is slowly increased, and rectified voltage continues to increase, at the t2 moment, rectified voltage be greater than LED light string L11 and
The conducting voltage of L22, driving switch pipe M22 conducting, driving switch pipe M11 are turned off, and the electric current flowed through in LED light string L22 continues
Increase, because LED light string L11 and L22 connect, thus also there is electric current to flow through in LED light string L11.Similarly, in t3 moment, rectified current
Pressure is greater than the conducting voltage of LED light string L11, L22 and L33, driving switch pipe M33 conducting, and driving switch pipe M11, M22 are turned off,
The electric current flowed through in LED light string L33 continues to increase, because LED light string L11, L22, L33 connect, thus LED light string L11, L22,
There is same current to flow through in L33.At the t4 moment, rectified voltage is greater than the conducting voltage of LED light string L11, L22, L33, L44, drives
Dynamic switching tube M44 conducting, driving switch pipe M11, M22, M33 are turned off, and the electric current flowed through in LED light string L44 continues to increase, because
LED light string L11, L22, L33 series connection, thus there is same current to flow through in LED light string L11, L22, L33, L44.Work as rectified voltage
Reach when slowly becoming smaller after maximum value, the reduction process of electric current is opposite with the process of aforementioned increase in LED light string.At the t5 moment,
There is same current to flow through in LED light string L11, L22, L33；At the t6 moment, there is same current to flow through in LED light string L11, L22,
The t7 moment has electric current to flow through in only LED light string L11；At the t8 moment, rectified voltage cannot allow any one LED light string to be connected,
All no currents flow through in all LED light strings.In next waveform, repeat the above process；Fig. 4 dotted line I1 is ideal current wave
Shape figure, solid line I are actual current waveform figures, and the not smaller current waveform smoothness of each divider resistance value difference is higher.
In one embodiment, the connection type and application of a kind of control circuit as shown in Figure 5 are provided, in the control
In circuit, bleeder circuit includes the first bleeder circuit and the second bleeder circuit.Wherein: the first bleeder circuit includes concatenated partial pressure
Resistance R7, R8, the voltage at the tie point of resistance R7, R8 provide operating voltage to the second bleeder circuit；Second bleeder circuit packet
Concatenated divider resistance R1, R2, R3, R4, R5 are included, operating voltage, and two neighboring resistance are accessed by the voltage input end VF of R1
Between voltage be reference voltage, successively provide reference voltage VB, VC, VD, VE respectively between R1 to R5, for it is corresponding
The control terminal of drive control circuit is connected.Drive control circuit has 4 groups, the connection type of every group of drive control circuit such as institute above
It states, details are not described herein.Input terminal from the 1st group of drive control circuit to the 4th group of drive control circuit respectively with each section of LED light
The current output terminal of string L11, L22, L33, L44 are connected；From the 1st group of drive control circuit to the control of the 4th group of drive control circuit
End processed is respectively connected to reference voltage VE, VD, VC, VB；From the 1st group of drive control circuit to the output of the 4th group of drive control circuit
End is connected with one end of sampling resistor R6, and the other end of sampling resistor R6 is connected with the current output terminal of divider resistance R8.Together
When, the current output terminal of divider resistance R8 is also connected with the cathode of rectification circuit W, and the anode and divider resistance of rectification circuit W
The current input terminal of R7 is connected.Electricity shown in the course of work and Fig. 3 that drive control circuit driving LED light string is sequentially turned on or disconnected
The course of work on road is identical.In this control circuit, drive control circuit and the second bleeder circuit are arranged in the chips, such as scheme
Region shown in middle dotted line, by the second bleeder circuit in Fig. 5 and schematic diagram such as Fig. 6 institute after drive control circuit integrated chip
Show.
IC1 is chip in Fig. 6, and the pin which provides includes the voltage access pin CP of the second bleeder circuit, is adopted
The connection pin S1 of sample resistance R6, each substring connection pin D1, D2, D3, D4 and grounding pin GND of LED light string.?
In practical application, the number of pins of chip and position are arranged according to actual needs.
The disclosure is described in detail above, used herein principle and embodiment party of the specific case to the disclosure
Formula is expounded, disclosed method that the above embodiments are only used to help understand and its core concept；Meanwhile it is right
In those skilled in the art, according to the thought of the disclosure, there will be changes in the specific implementation manner and application range, comprehensive
Upper described, the content of the present specification should not be construed as the limitation to the disclosure.
Claims (5)
1. a kind of high-voltage linear LED control circuit for reducing harmonic wave, it is characterised in that:
The control circuit includes bleeder circuit, drive control circuit, sampling resistor, in which:
LED light string includes N sections of concatenated substrings, wherein N is the integer greater than 1；The number of the drive control circuit is N group；
The bleeder circuit includes concatenated N+1 divider resistance；One end of the sampling resistor and all N group drive control circuits
Output end is connected；
The bleeder circuit provides reference voltage, the reference voltage waveform and LED light string input terminal to drive control circuit
On-load voltage waveform is consistent；The reference voltage flows through the electric current of LED light string in conjunction with sampling resistor control；
When the on-load voltage is greater than the conducting voltage of LED light string, the drive control circuit conducting passes through LED light
The current waveform of string is consistent with the on-load voltage waveform of LED light string input terminal, reduces harmonic wave；
Wherein, the drive control circuit includes voltage follower and driving switch pipe；
The input terminal of the driving switch pipe is the input terminal of drive control circuit, and the output end of the driving switch pipe is driving
The output end of control circuit；
And the input terminal of the driving switch pipe is connected with the LED light string；
The control terminal of the driving switch pipe is connected with the output end of voltage follower；
The voltage follower reverse input end is connected with the output end of driving switch pipe；
The positive input of the voltage follower accesses reference voltage, is the control terminal of drive control circuit；
Driving in the luminescence process of the LED light string, according to the variation of input voltage, in the N group drive control circuit
Switching tube is connected in turn；
And only one drive control circuit is connected in a period of time.
2. control circuit according to claim 1, it is characterised in that:
Each drive control circuit includes control terminal, input, output end；
Electric current is flowed into from the 1st divider resistance, is flowed out from N+1 divider resistance, and from the current output terminal of the 1st divider resistance
Current output terminal to n-th divider resistance is provided with N number of reference voltage；
The both ends of the paragraph 1 substring of the LED light string are electric with the current input terminal of the 1st divider resistance, the 1st group of drive control respectively
The input terminal on road is connected；
1st divider resistance is connected with the tie point of the 2nd divider resistance with the control terminal of N group drive control circuit, drives to N group
Dynamic control circuit provides reference voltage；
The I cross-talk string both ends of the LED light string respectively with the current output terminal of -1 cross-talk string of I, Group I drive control circuit
Input terminal be connected；I divider resistance and the tie point of+1 divider resistance of I and the control of N-I+1 group drive control circuit
End is connected, and provides reference voltage to N-I+1 group drive control circuit, wherein 1 < I≤N, I is integer；
The output end of N+1 divider resistance is connected with one end of the sampling resistor, the other end of the sampling resistor and all N
The output end of group drive control circuit is connected.
3. a kind of high-voltage linear LED control circuit for reducing harmonic wave, it is characterised in that:
The control circuit includes the first bleeder circuit, the second bleeder circuit, drive control circuit, sampling resistor, in which:
LED light string includes N sections of concatenated substrings, wherein N is the integer greater than 1；The number of the drive control circuit is N group；
Second bleeder circuit includes concatenated N+1 divider resistance；One end of the sampling resistor and all N group drive controls electricity
The output end on road is connected；
First bleeder circuit provides operating voltage to the second bleeder circuit；Second bleeder circuit is to drive control circuit
Reference voltage is provided, the reference voltage waveform is consistent with the on-load voltage waveform of LED light string input terminal；
The reference voltage flows through the electric current of LED light string in conjunction with sampling resistor control；The drive control circuit and described
Second bleeder circuit is arranged in the chips；
When the on-load voltage is greater than the conducting voltage of LED light string, the drive control circuit conducting passes through LED light
The current waveform of string is consistent with the on-load voltage waveform of LED light string input terminal, reduces harmonic wave；
Wherein, the drive control circuit includes voltage follower and driving switch pipe；
The input terminal of the driving switch pipe is the input terminal of drive control circuit, and the output end of the driving switch pipe is driving
The output end of control circuit；
And the input terminal of the driving switch pipe is connected with the LED light string；
The control terminal of the driving switch pipe is connected with the output end of voltage follower；
The voltage follower reverse input end is connected with the output end of driving switch pipe；
The positive input of the voltage follower accesses reference voltage, is the control terminal of drive control circuit；
Driving in the luminescence process of the LED light string, according to the variation of input voltage, in the N group drive control circuit
Switching tube is connected in turn；And only one drive control circuit is connected in a period of time.
4. control circuit according to claim 3, it is characterised in that:
Each drive control circuit includes control terminal, input, output end；
The bleeder circuit includes the first bleeder circuit, the second bleeder circuit, in which:
Electric current is flowed into from the 1st divider resistance, is flowed out from the N+1 divider resistance, and the N+1 divider resistance is grounded, and from the 1st
The current output terminal of the current output terminal of a divider resistance to n-th divider resistance is provided with N number of reference voltage；
First bleeder circuit includes concatenated N+2 divider resistance and N+3 divider resistance, and electric current divides electricity from N+2
Choked flow is to N+3 divider resistance；
The tie point of the N+2 divider resistance and N+3 divider resistance is connected with the current input terminal of the 1st divider resistance；
The both ends of the paragraph 1 substring of the LED light string respectively with the current input terminal of N+2 divider resistance, the 1st group of drive control
The input terminal of circuit is connected；
1st divider resistance is connected with the tie point of the 2nd divider resistance with the control terminal of N group drive control circuit, to N
Group drive control circuit provides reference voltage；
The both ends of the paragraph 1 substring of the LED light string are electric with the current output terminal of -1 cross-talk string of I, Group I drive control respectively
The output end on road is connected；
I divider resistance is connected with the tie point of+1 divider resistance of I with the control terminal of N-I+1 group drive control circuit, to
N-I+1 group drive control circuit provides reference voltage, wherein 1 < I≤N, I is integer；
The output end of N+3 divider resistance is connected with one end of the sampling resistor, the other end of the sampling resistor and all N
The output end of group drive control circuit is connected.
5. control circuit according to claim 3, it is characterised in that:
The chip includes excess temperature compensation circuit.
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| CN201610834996.5A CN106332362B (en) | 2016-09-20 | 2016-09-20 | A kind of high-voltage linear LED control circuit reducing harmonic wave |
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| CN201610834996.5A CN106332362B (en) | 2016-09-20 | 2016-09-20 | A kind of high-voltage linear LED control circuit reducing harmonic wave |
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| CN106332362B true CN106332362B (en) | 2019-03-15 |
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| CN106455227B (en) * | 2016-11-11 | 2019-02-01 | 深圳市明微电子股份有限公司 | A kind of LED linear constant-current control circuit and LED light emission device |
| CN111970799B (en) * | 2020-08-12 | 2022-01-25 | 陕西亚成微电子股份有限公司 | Multi-segment linear LED drive control method and circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480828A (en) * | 2010-11-24 | 2012-05-30 | 三星Led株式会社 | Led driving apparatus |
| CN103517533A (en) * | 2013-10-24 | 2014-01-15 | 开源集成电路(苏州)有限公司 | Sectional light emitting diode lighting drive circuit |
| CN103561509A (en) * | 2013-10-17 | 2014-02-05 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| CN103596328A (en) * | 2013-10-23 | 2014-02-19 | 浙江大学 | LED driving circuit |
| CN206149546U (en) * | 2016-09-20 | 2017-05-03 | 陕西亚成微电子股份有限公司 | Low -harmonic -wave's high -pressure linear LED control circuit falls |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI495394B (en) * | 2012-09-18 | 2015-08-01 | Raydium Semiconductor Corp | Led driving apparatus and operating method thereof |
-
2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480828A (en) * | 2010-11-24 | 2012-05-30 | 三星Led株式会社 | Led driving apparatus |
| CN103561509A (en) * | 2013-10-17 | 2014-02-05 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| CN103596328A (en) * | 2013-10-23 | 2014-02-19 | 浙江大学 | LED driving circuit |
| CN103517533A (en) * | 2013-10-24 | 2014-01-15 | 开源集成电路(苏州)有限公司 | Sectional light emitting diode lighting drive circuit |
| CN206149546U (en) * | 2016-09-20 | 2017-05-03 | 陕西亚成微电子股份有限公司 | Low -harmonic -wave's high -pressure linear LED control circuit falls |
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