CN203504853U - Novel linear LED drive circuit - Google Patents
Novel linear LED drive circuit Download PDFInfo
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- CN203504853U CN203504853U CN201320665230.0U CN201320665230U CN203504853U CN 203504853 U CN203504853 U CN 203504853U CN 201320665230 U CN201320665230 U CN 201320665230U CN 203504853 U CN203504853 U CN 203504853U
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- voltage
- sampling resistor
- control switch
- auxiliary capacitor
- switching point
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model provides a novel linear LED drive circuit characterized by comprising the following structures: a rectifier circuit converting AC power into DC power; a power voltage sampling circuit connected with the rectifier circuit and used for setting switching point voltage and comparing bus voltage of the rectifier circuit with the switching point voltage; a current control loop comprising a lamp bead string LED 1 connected with the bus voltage and an auxiliary capacitor C1 and used for receiving comparison result of the sampling circuit; when the bus voltage is higher than the switching point voltage, the lamp bead string LED 1 charges the auxiliary capacitor C1; when the bus voltage is lower than the switching point voltage, the auxiliary capacitor C1discharges to the lamp bead string LED 1. The advantages are that the lighting time of the LED lamp bead is increased in a whole period, thereby improving the utilization rate of the LED lamp, improving system efficiency and system power factors, and greatly reducing system cost.
Description
Technical field
The utility model relates to a kind of novel linear LED drive circuit.
Background technology
Fig. 1 is traditional linear LED drive circuit figure.
As shown in Figure 1, in conventional linear LED drive circuit, on lamp pearl string LED, terminate to the anode of bridge heap, an other termination constant current unit, this constant current unit is used for setting the electric current that flows through lamp pearl string LED.Because the number of lamp pearl string LED is many, the forward conduction voltage drop of lamp pearl string LED is higher, and in the electric power system of civil power, lamp pearl string LED will, at input voltage higher in the situation that, just can light; At input voltage, lower in the situation that, probably make lamp pearl string LED not work, so the utilance of lamp pearl string LED is very low, and power factor is also lower.General by reducing the number of lamp pearl string LED lamp pearl, to improve the utilance of lamp pearl string LED, but can make constant current unit in power MOS pipe power consumption become large, it is lower that the efficiency of system can become.Increase the control electric current of constant current, the brightness that can improve lamp pearl string LED, but need more high-power LED power-supply system, the cost of whole system and power consumption are increased simultaneously.
Utility model content
The utility model provides a kind of novel linear LED drive circuit, can be according to the size of supply voltage, and the mode of operation of decision systems, to overcome the defect of above-mentioned prior art.
The utility model provides a kind of novel linear LED drive circuit, has such feature and comprises: rectification circuit, is converted to direct current energy by AC energy; The sample circuit being connected with rectification circuit, sets switching point voltage, and the busbar voltage of rectification circuit and switching point voltage are compared; Current control loop, comprise the lamp pearl string LED1 and the auxiliary capacitor C1 that are connected with busbar voltage, receive the comparative result of sample circuit, when busbar voltage is during higher than switching point voltage, lamp pearl string LED1 charges to auxiliary capacitor C1, when busbar voltage is during lower than switching point voltage, auxiliary capacitor C1 discharges to lamp pearl string LED1.
Further, the utility model provides a kind of novel linear LED drive circuit, can also have such feature: rectification circuit is full-bridge rectification bridge heap.
Further, the utility model provides a kind of novel linear LED drive circuit, can also have such feature: sample circuit comprises the first sampling resistor R1 and the second sampling resistor R2 of series connection; The other end of the first sampling resistor R1 is connected with busbar voltage, and the other end of the second sampling resistor R2 is connected with earth terminal; The in-phase input end of comparator comp1 is connected with the tie point of the second sampling resistor R2 with the first sampling resistor R1, and reverse input end is connected with switching point voltage input end Vref0.
Further, the utility model provides a kind of novel linear LED drive circuit, can also have such feature: current control loop also comprises the logic control processing unit that input is connected with comparator comp1 output.
Further, the utility model provides a kind of novel linear LED drive circuit, can also have such feature: logic control processing unit comprises the first output K1 and the second output K2, when busbar voltage is during higher than switching point voltage, the first output K1 sends control signal; When busbar voltage is during lower than switching point voltage, the second output K2 sends control signal.
Further, the utility model provides a kind of novel linear LED drive circuit, can also have such feature: current control loop also comprises power MOS pipe M1, loop sampling resistor R3, operational amplifier amp, the first control switch S1, the second control switch S2, the 3rd control switch S3; Operational amplifier amp in the same way input is connected with voltage input end Vref1, and reverse input end is connected with the source electrode of power MOS pipe M1, and output is connected with the grid of power MOS pipe M1, and the drain electrode of power MOS pipe M1 is connected with lamp pearl string LED1 negative pole; Loop sampling resistor R3, the second control switch S2, auxiliary capacitor C1 series connection, the other end of loop sampling resistor R3 is connected with the source electrode of power MOS pipe M1, and the other end of auxiliary capacitor C1 is connected with earth terminal; One end of the first control switch S1 is connected with the junction of the second control switch S2 with loop sampling resistor R3, and other end earth terminal connects; One end of the 3rd control switch S3 is connected with lamp pearl string LED1 is anodal, and the other end is connected with the junction of the second control switch S2 with auxiliary capacitor C1; It is closed that the first output K1 controls the second control switch S2, and the second output K2 controls the first control switch S1 and the 3rd control switch S3 is closed.
The beneficial effect of utility model
According to a kind of novel linear LED drive circuit provided by the utility model, because sample circuit is sampled to busbar voltage, and compare with the switching point voltage of setting, comparative result is exported to the logic control processing unit of current control loop, current control loop arranges respectively at lamp pearl string and auxiliary capacitor the switch of being controlled by logic control processing unit, this circuit is according to the variation of supply voltage, decision-making circuit connected mode, when busbar voltage higher than set switching point voltage time, sample circuit is exported to logic control processing unit by this sampled result, it is closed that logic control processing unit is controlled the second control switch, other control switchs disconnect, lamp pearl string is connected with auxiliary capacitor, and when busbar voltage lower than set switching point voltage time, sample circuit is exported to logic control processing unit by this sampled result, logic control processing unit controls the first control switch and the 3rd control switch is closed, the second control switch disconnects, make auxiliary capacitor and the connection in series-parallel of lamp pearl.So, a kind of New LED drive circuit provided by the utility model can be in the situation that supply voltage be higher, lamp pearl string can charge to auxiliary capacitor, and supply voltage lower than set switching point voltage time, auxiliary capacitor C1 can discharge to lamp pearl string, increase the time of lighting of LED lamp pearl in the whole cycle, thereby improve the utilance of LED lamp.Compare with traditional LED linear circuit, thereby not only improved greatly the lamp pearl utilization rate of the system that realizes, and can improve the efficiency of system, increased the power factor of system, greatly also reduced the cost of system.
Accompanying drawing explanation
Fig. 1 is traditional linear LED drive circuit figure.
Fig. 2 is novel linear LED drive circuit figure provided by the utility model.
Fig. 3 is the circuit diagram that novel linear LED drive circuit provided by the utility model charges to auxiliary capacitor C1 in lamp beading LED1.
Fig. 4 is the circuit diagram that novel linear LED drive circuit provided by the utility model discharges to auxiliary capacitor C1 in lamp beading LED1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Fig. 2 is novel linear LED drive circuit figure provided by the utility model.
As shown in Figure 2, novel linear LED drive circuit comprises rectification circuit, sample circuit and current control loop.
Rectification circuit is full-bridge rectification bridge heap, four diode D1, D2, D3 and D4, consists of, and V1 is connected with AC power, and alternating voltage V1 is converted to busbar voltage Vbus.
The sample circuit being connected with rectification circuit comprises the first sampling resistor R1, the second sampling resistor R2 and the comparator comp1 of series connection.The first sampling resistor R1 and the second sampling resistor R2, the other end of the first sampling resistor R1 is connected with busbar voltage Vbus, and the other end of the second sampling resistor R2 is connected with earth terminal.The in-phase input end of comparator comp1 is connected with the tie point of the second sampling resistor R2 with the first sampling resistor R1, and reverse input end is connected with switching point voltage input end Vref0.The first sampling resistor R1 and the second sampling resistor R2, proportional sampling busbar voltage Vbus, and the voltage that busbar voltage Vbus dividing potential drop is obtained and Vref0 comparison, its result outputs to logic control processing unit.
Current control loop comprises lamp pearl string LED1, auxiliary capacitor C1, logic control processing unit, power MOS pipe M1, loop sampling resistor R3, operational amplifier amp, the first control switch S1, the second control switch S2, the 3rd control switch S3.
Logic control processing unit input is connected with comparator comp1 output.Logic control processing unit comprises the first output K1 and the second output K2.When busbar voltage is during higher than switching point voltage, the first output K1 sends control signal; When busbar voltage is during lower than switching point voltage, the second output K2 sends control signal.
Operational amplifier amp in the same way input is connected with voltage input end Vref1, and reverse input end is connected with the source electrode of power MOS pipe M1, and output is connected with the grid of power MOS pipe M1, and the drain electrode of power MOS pipe M1 is connected with lamp pearl string LED1 negative pole.The positive pole of lamp pearl string LED1 is connected with busbar voltage Vbus.
Loop sampling resistor R3, the second control switch S2, auxiliary capacitor C1 series connection.The other end of loop sampling resistor R3 is connected with the source electrode of power MOS pipe M1, and the other end of auxiliary capacitor C1 is connected with earth terminal.
One end of the first control switch S1 is connected with the junction of the second control switch S2 with loop sampling resistor R3, and other end earth terminal connects.
One end of the 3rd control switch S3 is connected with lamp pearl string LED1 is anodal, and the other end is connected with the junction of the second control switch S2 with auxiliary capacitor C1.
It is closed that the first output K1 controls the second control switch S2, and the second output K2 controls the first control switch S1 and the 3rd control switch S3 is closed.
The operation principle of novel linear LED drive circuit is as follows:
Lamp beading LED1 is to auxiliary capacitor C1 charged state:
Fig. 3 is that novel linear LED provided by the utility model drives the circuit diagram by LED1, auxiliary capacitor C1 being charged in supply voltage.
As shown in Figures 2 and 3, the voltage that in sample circuit, the first sampling resistor R1 and the second sampling resistor R2 sample is
When
Voltage higher than
During voltage, busbar voltage Vbus is higher than the switched voltage of setting, and comparator is output as height.The first output K1 of logic control processing unit sends control signal, controls second switch S2 closed, now the first switch S 1 and the 3rd switch S 3 off-states.Lamp pearl string LED1 and auxiliary capacitor C1 are in series connection, and lamp pearl string LED1 charges to auxiliary capacitor C1, and the electric current of lamp pearl string LED1 and auxiliary capacitor C1 is
At supply voltage, be high in the situation that, lamp pearl string LED1 can not only be lighted, and can will charge to auxiliary capacitor C1, in the time of can not making lamp pearl string LED1 normally work in order to supply voltage, increase auxiliary electric energy, lamp pearl string LED1 also can be lighted.
Auxiliary capacitor C1 to lamp beading LED1 to charged state:
Fig. 4 is that novel linear LED provided by the utility model drives the circuit diagram to LED1 electric discharge in auxiliary capacitor C1.
As shown in Figure 2 and Figure 4, the voltage that in sample circuit, the first sampling resistor R1 and the second sampling resistor R2 sample is
When
Voltage lower than
During voltage, busbar voltage Vbus is lower than the switched voltage of setting, and comparator is output as low.The second output K2 of logic control processing unit sends control signal, controls the first switch S 1 and the 3rd switch S 3 closures, now second switch S2 off-state.Lamp pearl string LED1 is with auxiliary capacitor C1 in state in parallel, and auxiliary capacitor C1 discharges to lamp pearl string LED1, and the electric current of power MOS pipe M1 is
In the situation that supply voltage is very low, the electric energy of laying in auxiliary capacitor C1, to lamp pearl string LED1 electric discharge, therefore, in the situation that supply voltage can not make lamp pearl string LED1 light, obtains the electric energy in auxiliary capacitor C1, LED1 lamp pearl string can, in low pressure situation, also can normally be lighted.The novel linear LED drive circuit that the utility model provides, within the whole cycle, can both maintain lamp pearl string LED1 and light, and then has increased the utilance of lamp pearl string LED1.
Claims (6)
1. a novel linear LED drive circuit, is characterized in that comprising:
Rectification circuit, is converted to direct current energy by AC energy;
The sample circuit being connected with described rectification circuit, sets switching point voltage, and the busbar voltage of described rectification circuit and described switching point voltage are compared;
Current control loop, comprise auxiliary capacitor (C1) and the lamp pearl string (LED1) being connected with described busbar voltage, receive the comparative result of described sample circuit, when described busbar voltage is during higher than described switching point voltage, described lamp pearl string (LED1) charges to auxiliary capacitor (C1), when described busbar voltage is during lower than described switching point voltage, described auxiliary capacitor (C1) discharges to described lamp pearl string (LED1).
2. novel linear LED drive circuit according to claim 1, is characterized in that:
Wherein, described rectification circuit is full-bridge rectification bridge heap.
3. novel linear LED drive circuit according to claim 1, is characterized in that:
Wherein, described sample circuit comprises the first sampling resistor (R1) and second sampling resistor (R2) of series connection;
The other end of described the first sampling resistor (R1) is connected with busbar voltage, and the other end of described the second sampling resistor (R2) is connected with earth terminal;
The in-phase input end of comparator (comp1) is connected with the tie point of the second sampling resistor (R2) with described the first sampling resistor (R1), and reverse input end is connected with described switching point voltage input end (Vref0).
4. novel linear LED drive circuit according to claim 3, is characterized in that:
Wherein, described current control loop also comprises the logic control processing unit that input is connected with described comparator (comp1) output.
5. novel linear LED drive circuit according to claim 4, is characterized in that:
Wherein, described logic control processing unit comprises the first output (K1) and the second output (K2);
When described busbar voltage is during higher than described switching point voltage, described the first output (K1) sends control signal; When described busbar voltage is during lower than described switching point voltage, described the second output (K2) sends control signal.
6. novel linear LED drive circuit according to claim 5, is characterized in that:
Wherein, described current control loop also comprises power MOS pipe (M1), loop sampling resistor (R3), operational amplifier (amp), the first control switch (S1), the second control switch (S2), the 3rd control switch (S3);
Operational amplifier (amp) in the same way input is connected with voltage input end (Vref1), reverse input end is connected with the source electrode of described power MOS pipe (M1), output is connected with the grid of described power MOS pipe (M1), and the drain electrode of power MOS pipe (M1) is connected with described lamp pearl string (LED1) negative pole;
Described loop sampling resistor (R3), described the second control switch (S2), described auxiliary capacitor (C1) series connection, the other end of described loop sampling resistor (R3) is connected with the source electrode of described power MOS pipe (M1), and the other end of described auxiliary capacitor (C1) is connected with earth terminal;
One end of described the first control switch (S1) is connected with the junction of described the second control switch (S2) with described loop sampling resistor (R3), and other end earth terminal connects;
One end of described the 3rd control switch (S3) is connected with lamp pearl string (LED1) is anodal, and the other end is connected with the junction of described the second control switch (S2) with described auxiliary capacitor (C1);
Described the first output (K1) is controlled described the second control switch (S2) closure, and described the second output (K2) is controlled described the first control switch (S1) and the 3rd control switch (S3) closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320665230.0U CN203504853U (en) | 2013-10-25 | 2013-10-25 | Novel linear LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320665230.0U CN203504853U (en) | 2013-10-25 | 2013-10-25 | Novel linear LED drive circuit |
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| CN203504853U true CN203504853U (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320665230.0U Expired - Fee Related CN203504853U (en) | 2013-10-25 | 2013-10-25 | Novel linear LED drive circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333940A (en) * | 2014-09-16 | 2015-02-04 | 石崇源 | High-efficiency overvoltage power supply LED driver |
| CN105282899A (en) * | 2014-06-17 | 2016-01-27 | 钰瀚科技股份有限公司 | Low-flicker and high-power-factor light emitting diode drive circuit |
| CN109168219A (en) * | 2015-04-30 | 2019-01-08 | 杰华特微电子（杭州）有限公司 | A kind of antihunt circuit and the LED drive circuit with antihunt circuit |
-
2013
- 2013-10-25 CN CN201320665230.0U patent/CN203504853U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282899A (en) * | 2014-06-17 | 2016-01-27 | 钰瀚科技股份有限公司 | Low-flicker and high-power-factor light emitting diode drive circuit |
| CN105282899B (en) * | 2014-06-17 | 2018-03-27 | 钰瀚科技股份有限公司 | The drive circuit of the light emitting diode of low flicker and high power factor |
| CN104333940A (en) * | 2014-09-16 | 2015-02-04 | 石崇源 | High-efficiency overvoltage power supply LED driver |
| CN109168219A (en) * | 2015-04-30 | 2019-01-08 | 杰华特微电子（杭州）有限公司 | A kind of antihunt circuit and the LED drive circuit with antihunt circuit |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20181025 |
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| CF01 | Termination of patent right due to non-payment of annual fee |