CN103702483A - High efficiency linear topology structure LED (Light Emitting Diode) driving circuit - Google Patents
High efficiency linear topology structure LED (Light Emitting Diode) driving circuit Download PDFInfo
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- CN103702483A CN103702483A CN201310711872.4A CN201310711872A CN103702483A CN 103702483 A CN103702483 A CN 103702483A CN 201310711872 A CN201310711872 A CN 201310711872A CN 103702483 A CN103702483 A CN 103702483A
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Abstract
The invention relates to a high efficiency linear topology structure LED (Light Emitting Diode) driving circuit. The high efficiency linear topology structure LED driving circuit comprises a rectifier bridge, a linear IC (Integrated Circuit) regulator for controlling constant output, and a main lamp string, wherein an intelligent switch regulating circuit for optimizing the constant output is connected between the linear IC regulator and the main lamp string; the SW (Southwestern) end of the intelligent switch regulating circuit is connected with the GND (Ground) end of the linear IC regulator; the GND end of the intelligent switch regulating circuit is connected with the main lamp string; the intelligent switch regulating circuit consists of one or more serially connected intelligent switch regulators; each intelligent switch regulator comprises a switch for controlling the opening and closing by threshold voltage; the input end of the switch is the SW end, and the output end of the switch is the GND end; a power resistor or an LED lamp string is connected between the SW end of each intelligent switch regulator and the GND end of each intelligent switch regulator. The high efficiency linear topology structure LED driving circuit has the beneficial effect that the range of input voltage is widened, so that the efficiency and the power factor of the system become higher.
Description
Technical field
The present invention relates to a kind of high-efficient linear topological structure LED drive circuit.
Background technology
LED illumination is widely used in market, as commercial lighting, and domestic lighting etc.At present, increasing electric lighting is replaced by LED light fixture, and a lot of countries also just eliminate conventional incandescent planned, and the light source staying is mainly electricity-saving lamp and LED.Although LED illumination is popularized, LED drive circuit also exists many problems.
With reference to Fig. 1, traditional AC/DC constant current drives linear topological structure example one to use constant-current device (CRD) to control constant current output.It needs some voltage margin to keep current constant.It does not have overheat protector function, a little less than antisurge ability.The power factor of this scheme is lower.
With reference to Fig. 2, traditional AC/DC constant current drives linear topological structure example two to use IC technology to control constant current output.Generally, output current carrys out programming Control by non-essential resistance.It has overheat protector function, and segmentation scheme also can be by surge test, but power factor is lower.
Summary of the invention
The invention provides a kind of power factor high, can not produce excessive temperature, use safe high-efficient linear topological structure LED drive circuit.
For reaching goal of the invention the technical solution used in the present invention, be:
High-efficient linear topological structure LED drive circuit, it is characterized in that: the linear IC adjuster, the king light string that comprise rectifier bridge, control constant current output, between the cathode output end of described rectifier bridge and cathode output end, be connected with input capacitance, described linear IC adjuster comprises a power supply switch tube, and the input of described power supply switch tube is V
cCend, it is connected with the cathode output end of rectifier bridge, and the output of described power supply switch tube is I
sETend, on it, be connected with one for the non-essential resistance of the electric current of LED is set, the other end of described non-essential resistance is connected with the GND end of linear IC adjuster, between described linear IC adjuster and king light string, be connected with the intelligent switch regulating circuit of an optimization constant current output, the SW end of described intelligent switch regulating circuit is connected with the GND end of linear IC adjuster, the GND end of described intelligent switch regulating circuit connects with king light series winding, described intelligent switch regulating circuit is comprised of the intelligent switch adjuster of one or more serial connections, described intelligent switch adjuster comprises that one controls by threshold voltage the switch opening and closing, the input of described switch is SW end, its output is GND end, between the SW end of described intelligent switch adjuster is held with the GND of intelligent switch adjuster and be connected to power resistor or a LED lamp string.
Further, described intelligent switch adjuster also comprises a comparator, internal reference voltage V
rEF, the in-phase end of described comparator connects described internal reference voltage V
rEF, the end of oppisite phase of described comparator is the V that threshold voltage is set
tHend, described comparator with to it, provide the V of operating current
iNend connects, and the output of described comparator is connected with the control line that control switch opens and closes, the V of described intelligent switch adjuster
iNend is connected or V with the cathode output end of rectifier bridge
iNend is connected by a resistance with the cathode output end of rectifier bridge, between the GND end of described intelligent switch adjuster and the cathode output end of rectifier bridge, is connected with resitstance voltage divider, the V of described intelligent switch adjuster
tHend is connected with the intermediate point of resitstance voltage divider.
Further, described linear IC adjuster also comprises operational amplifier and the internal reference voltage V that regulates electric power outputting current
rEF, the electrode input end of described operational amplifier and internal reference voltage V
rEFanode connect, its negative input is connected with the output of power supply switch tube, its output is connected with the control end of power supply switch tube, the input of described power supply switch tube and internal reference voltage V
rEFfeeder ear connect, described internal reference voltage V
rEFnegative terminal be GND end.
The present invention adopts the structure of linear IC adjuster+intelligent switch adjuster to carry out driving LED, by linear IC adjuster, controls constant current output, by intelligent switch adjuster, selects the electric current that flows through king light string by passage, as the V of intelligent switch adjuster
tHduring the large reference voltage in the inner of the voltage of end, the disconnection of the switch in intelligent switch adjuster, flow through the electric current of king light string from power resistor or a LED lamp crossfire mistake, expanded the input voltage of linear IC adjuster, passing siding IC adjuster does not produce too much heat simultaneously.But also the electric current that can flow through king light string by selection improves power factor by passage, the intelligent switch adjuster of a plurality of serial connections is set, can come selectively unlocking or closed portion LED lamp string according to the size of input voltage, consume too much energy or realize constant current output and high system effectiveness.
Beneficial effect of the present invention: the input voltage range that has expanded linear constant current regulator.It is supported under the condition that input voltage is 220VAC+-20% or 120VAC+-20% and works, and also can not come to harm in hot environment.Effective combination of the spin-off by linear IC adjuster and intelligent switch adjuster or intelligent switch adjuster, can avoid the generation of excessive temperature situation, and it is higher that the configuration of optimization also can make that the efficiency of system and power factor become.
Accompanying drawing explanation
Fig. 1 is that traditional AC/DC constant current drives linear topological structure example one.
Fig. 2 is that traditional AC/DC constant current drives linear topological structure example two.
Fig. 3 is the circuit theory diagrams of the first embodiment of the present invention.
Fig. 4 is the cut-away view of linear IC adjuster of the present invention.
Fig. 5 is the cut-away view of intelligent switch adjuster of the present invention.
Fig. 6 is the efficiency schematic diagram of the first embodiment of the present invention.
Fig. 7 is the circuit theory diagrams of the second embodiment of the present invention.
Fig. 8 is the circuit theory diagrams of the third embodiment of the present invention.
Fig. 9 is the circuit theory diagrams of the 4th kind of embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, but does not limit the invention to these embodiments.One skilled in the art would recognize that the present invention contained all alternatives, improvement project and the equivalents that within the scope of claims, may comprise.
Embodiment mono-
With reference to Fig. 3, Fig. 4, Fig. 5, high-efficient linear topological structure LED drive circuit, the linear IC adjuster HL2601, the king light string 3 that comprise rectifier bridge 1, control constant current output, between the cathode output end of described rectifier bridge 1 and cathode output end, be connected with input capacitance C1, described linear IC adjuster HL2601 comprises a power supply switch tube SW2, and the input of described power supply switch tube SW2 is V
cCend, it is connected with the cathode output end of rectifier bridge 1, and the output of described power supply switch tube SW2 is I
sETend, on it, be connected with one for the non-essential resistance R1 of the electric current of LED is set, the other end of described non-essential resistance R1 is connected with the GND end of linear IC adjuster HL2601, between described linear IC adjuster HL2601 and king light string 3, be connected with the intelligent switch regulating circuit of an optimization constant current output, the SW end of described intelligent switch regulating circuit is connected with the GND end of linear IC adjuster HL2601, the GND end of described intelligent switch regulating circuit is connected with king light string 3, described intelligent switch regulating circuit is comprised of an intelligent switch adjuster HL2701, described intelligent switch adjuster HL2701 comprises that one controls by threshold voltage the interrupteur SW 1 opening and closing, the input of described interrupteur SW 1 is SW end, its output is GND end, between the SW end of described intelligent switch adjuster HL2701 is held with the GND of intelligent switch adjuster HL2701 and be connected to power resistor or a LED lamp string 2.
Described intelligent switch adjuster HL2701 also comprises a comparator Q1, internal reference voltage V
rEF, the in-phase end of described comparator Q1 connects described internal reference voltage V
rEF, the end of oppisite phase of described comparator Q1 is the V that threshold voltage is set
tHend, described comparator Q1 with to it, provide the V of operating current
iNend connects, and the output of described comparator Q1 is connected with the control line that control switch SW1 opens and closes, the V of described intelligent switch adjuster HL2701
iNend is connected or V with the cathode output end of rectifier bridge
iNend is connected by a resistance with the cathode output end of rectifier bridge, between the GND end of described intelligent switch adjuster HL2701 and the cathode output end of rectifier bridge, is connected with resitstance voltage divider, the V of described intelligent switch adjuster HL2701
tHend is connected with the intermediate point of resitstance voltage divider.
Described linear IC adjuster HL2601 also comprises the operational amplifier A 1 and internal reference voltage V that regulates electric power outputting current
rEF, the electrode input end of described operational amplifier A 1 and internal reference voltage V
rEFanode connect, its negative input is connected with the output of power supply switch tube SW2, its output is connected with the control end of power supply switch tube SW2, the input of described power supply switch tube SW2 and internal reference voltage V
rEFanode connect, described internal reference voltage V
rEFnegative terminal be GND end.
The intelligent switch adjuster HL2701 chip of the present embodiment is that voltage is controlled by non-essential resistance voltage divider R2 and R4 by voltage-controlled conditionity on-off equipment.The GND end of linear IC adjuster HL2601 is connected with the SW end of intelligent switch adjuster HL2701, and R1 is for arranging the electric current of LED.V
iNend provides the operating current of intelligent switch adjuster HL2701.C1 is the input capacitance after rectifier bridge.Can a power resistor in parallel or a LED lamp string 2 between the SW end of intelligent switch adjuster HL2701 and GND end.King light string 3 is the following LED lamp string of intelligent switch adjuster HL2701 GND end.Output current is program control by outer meeting resistance R1.According to resitstance voltage divider R2 and the predefined voltage of R4, intelligent switch adjuster HL2701 can allow to conditionity electric current flow through from power resistor/LED lamp string 2 or from intelligent switch adjuster HL2701 internal switch.Control voltage at V
tHon end, arrange, intelligent switch adjuster HL2701 inside is also provided with reference voltage.Work as V
tHwhen terminal voltage is greater than reference voltage, intelligent switch adjuster HL2701 internal switch disconnects, and the electric current that flows through king light string 3 can flow through from power resistor or external LED lamp string 2.Such configuration can allow the input voltage range of system become wider, and passing siding IC adjuster HL2601 does not produce too much heat yet simultaneously.
With reference to Fig. 6, when the present embodiment is used, within the scope of desirable AC-input voltage, can obtain very high efficiency curve.According to efficiency curve, can regulate optimized system effectiveness at fixing input voltage point.
Embodiment bis-
With reference to Fig. 7, the present embodiment is that described intelligent switch regulating circuit is comprised of two intelligent switch adjusters that are connected in series with the difference of embodiment mono-, and this allows linear LED drive more selection.Non-essential resistance voltage divider R3 and R4 control the V of intelligent switch adjuster HL2701 (1)
tHterminal voltage, resitstance voltage divider R5 and R6 control the V of intelligent switch adjuster HL2701 (2)
tHterminal voltage.The GND end of linear IC adjuster HL2601 is connected with the SW end of intelligent switch adjuster HL2701 (1), the GND end of intelligent switch adjuster HL2701 (1) chip is connected with the SW end of intelligent switch adjuster HL2701 (2), and outer meeting resistance R1 is for arranging the electric current of LED.R2 and R7 are respectively the V of intelligent switch adjuster HL2701 (1) and intelligent switch adjuster HL2701 (2)
iNend provides operating current.C1 is the input capacitance after rectifier bridge 1.A power resistor in parallel or a LED lamp string 2 between the SW end of intelligent switch adjuster HL2701 (1) and GND end, and can a power resistor in parallel or a LED lamp string 4 between the SW of intelligent switch adjuster HL2701 (2) end and GND end.The following LED lamp string of intelligent switch adjuster HL2701 (2) GND end is king light string 3.When input voltage is lower than expection when voltage, intelligent switch regulating circuit can close to maintain constant current by LED lamp string 2 and 4; When input voltage reaches expection voltage, intelligent switch regulating circuit can close LED lamp string 2 to maintain constant current and realize high efficiency.When input voltage is higher than expection when voltage, intelligent switch regulating circuit can be turned on power resistor or extra LED lamp string 2 and 4, avoids the too much energy of system consumption, thereby realizes constant current output and high system effectiveness.
Embodiment tri-
With reference to Fig. 8, the present embodiment is that described intelligent switch regulating circuit is comprised of three intelligent switch adjusters that are connected in series with the difference of embodiment mono-, and this framework can be used very little input capacitance after bridge heap, thereby can obtain higher power factor.Non-essential resistance voltage divider R3 and R4 control the V of intelligent switch adjuster HL2701 (1)
tHterminal voltage, resitstance voltage divider R5 and R6 control the V of intelligent switch adjuster HL2701 (2)
tHterminal voltage, resitstance voltage divider R9 and R10 control the V of intelligent switch adjuster HL2701 (3)
tHterminal voltage.The GND end of linear IC adjuster HL2601 is connected with the SW end of intelligent switch adjuster HL2701 (1), and outer meeting resistance R1 is for arranging the electric current of LED.R2, R7 and R8 are respectively intelligent switch adjuster HL2701 (1), the V of intelligent switch adjuster HL2701 (2) and intelligent switch adjuster HL2701 (3)
iNend provides operating current.C1 is the input capacitance after rectifier bridge 1.A power resistor in parallel or a LED lamp string 2 between the SW end of intelligent switch adjuster HL2701 (1) and GND end, a power resistor in parallel or a LED lamp string 4 between the SW end of intelligent switch adjuster HL2701 (2) and GND end, a power resistor in parallel or a LED lamp string 5 between the SW end of intelligent switch adjuster HL2701 (3) and GND end.The following LED lamp string of GND end of intelligent switch adjuster HL2701 (3) is king light string 3.
Embodiment tetra-
With reference to Fig. 9, a plurality of intelligent switch adjuster HL2701 combinations can be for the local optimum of system, some wave band when power transfer, along with the switch of each intelligent switch adjuster HL2701 when the different voltage, it can optimization system efficiency at certain more than scope.Non-essential resistance voltage divider R5 and R6 control the V of intelligent switch adjuster HL2701 (1)
tHterminal voltage, non-essential resistance voltage divider R3 and R4 control the V of intelligent switch adjuster HL2701 (2)
tHterminal voltage, non-essential resistance voltage divider R1 and R2 control the V of intelligent switch adjuster HL2701 (3)
tHterminal voltage.The I of linear IC adjuster HL2601 chip
sETthe R8 that pin connects is for arranging the electric current of LED.R7 is the V of intelligent switch adjuster HL2701 (1), intelligent switch adjuster HL2701 (2) and intelligent switch adjuster HL2701 (3)
iNend provides operating current.C1 is the input capacitance after rectifier bridge 1.A power resistor in parallel or a LED lamp string 2 between the SW end of the positive pole of rectifier bridge 1 output and intelligent switch adjuster HL2701 (1), a power resistor in parallel or a LED lamp string 4 between the SW end of intelligent switch adjuster HL2701 (1) and the SW end of intelligent switch adjuster HL2701 (2), a power resistor in parallel or a LED lamp string 5 between the SW end of intelligent switch adjuster HL2701 (2) and the SW end of intelligent switch adjuster HL2701 (3).When input voltage starts to rise gradually, resitstance voltage divider R5 and R6 are arranged to intelligent switch adjuster HL2701(1) first close LED lamp string 2 conductings that transference intelligent switch adjuster HL2701 (1) is in parallel; When input voltage constantly rises, resitstance voltage divider R3 and R4 are arranged to intelligent switch adjuster HL2701(2) close subsequently LED lamp string 4 conductings that transference intelligent switch adjuster HL2701 (2) is in parallel; When input voltage continues to rise, resitstance voltage divider R1 and R2 are arranged to intelligent switch adjuster HL2701(3) close subsequently LED lamp string 5 conductings that transference intelligent switch adjuster HL2701 (3) is in parallel.Like this, when input voltage fluctuation, each intelligent switch adjuster HL2701 closes selectively, allows unnecessary voltage drop on LED lamp string, improves the efficiency of system.For example, the efficiency of system can 200V to 240V alternating current its efficiency of when input between 86%-90%.
Claims (3)
1. high-efficient linear topological structure LED drive circuit, it is characterized in that: the linear IC adjuster, the king light string that comprise rectifier bridge, control constant current output, between the cathode output end of described rectifier bridge and cathode output end, be connected with input capacitance, described linear IC adjuster comprises a power supply switch tube, and the input of described power supply switch tube is V
cCend, it is connected with the cathode output end of rectifier bridge, and the output of described power supply switch tube is I
sETend, its I
sETon port, be connected with one for the non-essential resistance of the electric current of LED is set, the other end of described non-essential resistance is connected with the GND end of linear IC adjuster, between described linear IC adjuster and king light string, be connected with the intelligent switch regulating circuit of an optimization constant current output, the SW end of described intelligent switch regulating circuit is connected with the GND end of linear IC adjuster, the GND end of described intelligent switch regulating circuit connects with king light series winding, described intelligent switch regulating circuit is comprised of the intelligent switch adjuster of one or more serial connections, described intelligent switch adjuster comprises that one controls by threshold voltage the switch opening and closing, the input of described switch is SW end, its output is GND end, between the SW end of described intelligent switch adjuster is held with the GND of intelligent switch adjuster and be connected to power resistor or a LED lamp string.
2. high-efficient linear topological structure LED drive circuit according to claim 1, is characterized in that: described intelligent switch adjuster also comprises a comparator, internal reference voltage V
rEF, the in-phase end of described comparator connects described internal reference voltage V
rEF, the end of oppisite phase of described comparator is the V that threshold voltage is set
tHend, described comparator with to it, provide the V of operating current
iNend connects, and the output of described comparator is connected with the control line that control switch opens and closes, the V of described intelligent switch adjuster
iNend is connected or V with the cathode output end of rectifier bridge
iNend is connected by a resistance with the cathode output end of rectifier bridge, between the GND end of described intelligent switch adjuster and the cathode output end of rectifier bridge, is connected with resitstance voltage divider, described intelligent switch adjuster V
tHend is connected with the intermediate point of resitstance voltage divider.
3. high-efficient linear topological structure LED drive circuit according to claim 1 and 2, it is characterized in that: described linear IC adjuster also comprises operational amplifier and the internal reference voltage that regulates electric power outputting current, the electrode input end of described operational amplifier is connected with the anode of internal reference voltage, its negative input is connected with the output of power supply switch tube, its output is connected with the control end of power supply switch tube, the input of described power supply switch tube is connected with the feeder ear of internal reference voltage, and the negative terminal of described internal reference voltage is GND end.
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| CN201310711872.4A CN103702483B (en) | 2013-12-20 | 2013-12-20 | High-efficient linear topological structure LED drive circuit |
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| CN201310711872.4A CN103702483B (en) | 2013-12-20 | 2013-12-20 | High-efficient linear topological structure LED drive circuit |
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| CN103702483A true CN103702483A (en) | 2014-04-02 |
| CN103702483B CN103702483B (en) | 2016-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188211A (en) * | 2015-09-02 | 2015-12-23 | 绍兴恒力特微电子有限公司 | Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| TWI565358B (en) * | 2014-07-03 | 2017-01-01 | 安恩科技股份有限公司 | Light-emitting diode lighting device having multiple driving stages and line/load regulation control |
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| CN201509344U (en) * | 2009-09-29 | 2010-06-16 | 李云霄 | Drive circuit of LED light source of alternating-current power supply |
| CN201657419U (en) * | 2010-03-12 | 2010-11-24 | 陈林 | LED lighting device capable of self-adapting to voltage of power source |
| CN203632939U (en) * | 2013-12-20 | 2014-06-04 | 绍兴恒力特微电子有限公司 | LED deriving circuit with high-efficient linear topological structure |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201509344U (en) * | 2009-09-29 | 2010-06-16 | 李云霄 | Drive circuit of LED light source of alternating-current power supply |
| CN201657419U (en) * | 2010-03-12 | 2010-11-24 | 陈林 | LED lighting device capable of self-adapting to voltage of power source |
| CN203632939U (en) * | 2013-12-20 | 2014-06-04 | 绍兴恒力特微电子有限公司 | LED deriving circuit with high-efficient linear topological structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI565358B (en) * | 2014-07-03 | 2017-01-01 | 安恩科技股份有限公司 | Light-emitting diode lighting device having multiple driving stages and line/load regulation control |
| CN105188211A (en) * | 2015-09-02 | 2015-12-23 | 绍兴恒力特微电子有限公司 | Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
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| CN103702483B (en) | 2016-08-17 |
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