CN204206569U - A kind of linear LED drive circuit of high power factor - Google Patents
A kind of linear LED drive circuit of high power factor Download PDFInfo
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- CN204206569U CN204206569U CN201420719375.9U CN201420719375U CN204206569U CN 204206569 U CN204206569 U CN 204206569U CN 201420719375 U CN201420719375 U CN 201420719375U CN 204206569 U CN204206569 U CN 204206569U
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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 is the LED illumination drive circuit providing a kind of high power factor, comprise 4 N-type high-voltage tubes, 5 resistance, 1 Zener diode, 3 high-voltage LEDs, 2 comparators, 1 operational transconductance amplifier, 1 control logic circuit, the linear LED drive circuit of a kind of high power factor described in the utility model, for piecewise linearity constant current technology, be that piecewise linearity changes by the operating current of illuminator and line voltage, thus improve the PFC factor of illuminator, provide the PFC factor higher than 0.95 in the utility model simultaneously, decrease the pollution of illuminator to electrical network.
Description
Technical field
The utility model relates to microelectronics technology, particularly relates to a kind of linear LED drive circuit of high power factor.
Background technology
LED light source is forth generation lighting source, has the advantages such as energy-saving and environmental protection, safety, life-span length, has been widely used in the fields such as various instruction, display, decoration, backlight, general lighting and urban landscape.Along with the LED illumination that reduces gradually of cost becomes the main flow light fixture of illumination by replacing traditional lighting gradually.Current LED illumination scheme connects with power network mainly through rectifier, can produce a large amount of current harmonicss and reactive power and pollute electrical network, become Electric Power Disserve in electrical network, and scheme is complicated, poor reliability.
Summary of the invention
For the deficiencies in the prior art, the utility model is to provide a kind of PFC factor improving illuminator, reduces illuminator to the pollution of electrical network, reduces costs simultaneously, improve the linear LED drive circuit of the high power factor of the reliability of illuminator.
For achieving the above object, the utility model is achieved by following technical proposals:
A LED illumination drive circuit for high power factor, comprises 4 N-type high-voltage tubes, 5 resistance, 1 Zener diode, 3 high-voltage LEDs, 2 comparators, 1 operational transconductance amplifier, 1 control logic circuit, it is characterized in that:
The base stage of the first N-type high-voltage tube MN1, one end of resistance R1 are connected with the negative electrode of the 0th diode D0; Source electrode, resistance R2 one end of first N-type high-voltage tube MN1 are connected with output port VDD; The grid of the second N-type high-voltage tube MN2, the grid of the 3rd N-type high-voltage tube MN3, the output of the first comparator COMP1, the output of the second comparator COMP2 are connected with control logic circuit Control Logic; The drain electrode of the second N-type high-voltage tube MN2 is connected with the anode of the negative electrode of the first light-emitting diode L1, the second light-emitting diode L2; The source electrode of the second N-type high-voltage tube MN2 is connected with one end of resistance R3; The drain electrode of the 3rd N-type high-voltage tube MN3 is connected with the anode of the negative electrode of the second light-emitting diode L2, the 3rd light-emitting diode L3; The source electrode of the 3rd N-type high-voltage tube MN3, one end of resistance R4 are connected with the reverse input end of the first comparator COMP1; The drain electrode of the 4th N-type high-voltage tube MN4 is connected with the negative electrode of the 3rd light-emitting diode L3; The reverse input end of the source electrode of the 4th N-type high-voltage tube MN4, one end of resistance R5, operational transconductance amplifier OTA, the reverse input end of the second comparator COMP2 connect; The grid of the 4th N-type high-voltage tube MN4 is connected with the output of operational transconductance amplifier OTA; The positive input of operational transconductance amplifier OTA is connected with reference voltage V ref1; The positive input of the first comparator COMP1, the positive input of the second comparator COMP2 are connected with reference voltage V ref2;
The anode of the drain electrode of the first N-type high-voltage tube MN1, the other end of resistance R1, the first light-emitting diode L1 is connected with power supply HV_IN;
The other end of the anode of the 0th diode D0, the other end of resistance R2, resistance R3, the other end of resistance R4, the other end of resistance R5 are connected with ground GND.
The beneficial effects of the utility model are:
1) the linear LED drive circuit of a kind of high power factor of the present invention, for piecewise linearity constant current technology, be that piecewise linearity changes by the operating current of illuminator and line voltage, thus improve the PFC factor of illuminator, provide the PFC factor higher than 0.95 in the present invention simultaneously, decrease the pollution of illuminator to electrical network;
2) the present invention's inner integrated high voltage start-up circuit simultaneously, substantially reduces the device expense of system.
Present system scheme is simple, and reliability is high, can greatly reduce the cost of system, and reduces the pollution of illuminator to electrical network, improves the reliability of illuminator.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the drive current waveform figure of the LED illumination drive circuit of high power factor described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
As shown in Figure 1, the LED illumination drive circuit of described high power factor:
Comprise 1 operational transconductance amplifier, 2 comparators, 1 control logic circuit, 4 N-type high-voltage tubes, 5 resistance, 1 Zener diode, 3 high-voltage LEDs, is characterized in that:
The base stage of the first N-type high-voltage tube MN1, one end of resistance R1 are connected with the negative electrode of the 0th diode D0; Source electrode, resistance R2 one end of first N-type high-voltage tube MN1 are connected with output port VDD; The grid of the second N-type high-voltage tube MN2, the grid of the 3rd N-type high-voltage tube MN3, the output of the first comparator COMP1, the output of the second comparator COMP2 are connected with control logic circuit Control Logic; The drain electrode of the second N-type high-voltage tube MN2 is connected with the anode of the negative electrode of the first light-emitting diode L1, the second light-emitting diode L2; The source electrode of the second N-type high-voltage tube MN2 is connected with one end of resistance R3; The drain electrode of the 3rd N-type high-voltage tube MN3 is connected with the anode of the negative electrode of the second light-emitting diode L2, the 3rd light-emitting diode L3; The source electrode of the 3rd N-type high-voltage tube MN3, one end of resistance R4 are connected with the reverse input end of the first comparator COMP1; The drain electrode of the 4th N-type high-voltage tube MN4 is connected with the negative electrode of the 3rd light-emitting diode L3; The reverse input end of the source electrode of the 4th N-type high-voltage tube MN4, one end of resistance R5, operational transconductance amplifier OTA, the reverse input end of the second comparator COMP2 connect; The grid of the 4th N-type high-voltage tube MN4 is connected with the output of operational transconductance amplifier OTA; The positive input of operational transconductance amplifier OTA is connected with reference voltage V ref1; The positive input of the first comparator COMP1, the positive input of the second comparator COMP2 are connected with reference voltage V ref2.
The anode of the drain electrode of the first N-type high-voltage tube MN1, the other end of resistance R1, the first light-emitting diode L1 is connected with power supply HV_IN.
The other end of the anode of the 0th diode D0, the other end of resistance R2, resistance R3, the other end of resistance R4, the other end of resistance R5 are connected with ground GND.
The LED illumination drive circuit works principle summary of the high power factor shown in Fig. 1:
This circuit lower part is LED illumination drive circuit, and upper part is LED array, represents different LED array in figure with light-emitting diode L1, L2 and L3.
In the LED illumination drive circuit shown in Fig. 1, left-hand component is HV Start-up circuit, and high input voltage HV_IN is converted to low-tension supply VDD by it; On the right in part, three high-voltage tube initial conditions are all conducting state, and when input voltage HV_IN is lower, electric current flows away from the second N-type high-voltage tube MN2 and resistance R3, now only have the first light-emitting diode L1 luminous; When input voltage HV_IN raises, some electric current flows away from the 3rd N-type high-voltage tube MN3 and resistance R4, when this electric current increases to a certain degree, by the first comparator COMP1 and logic control circuit Control Logic, the second N-type high-voltage tube MN2 is turned off, all electric currents flow away from the 3rd N-type high-voltage tube MN3 and resistance R4, and the first light-emitting diode L1 and the second light-emitting diode L2 is luminous; When input voltage HV_IN continues to raise, some electric current flows away from the 4th N-type high-voltage tube MN4 and resistance R5, when this electric current increases to a certain degree, by the second comparator COMP2 and logic control circuit Control Logic, the 3rd N-type high-voltage tube MN3 is turned off, all electric currents flow away from the 4th N-type high-voltage tube MN4 and resistance R5, and the first light-emitting diode L1, the second light-emitting diode L2 and the 3rd light-emitting diode L3 are luminous; When input voltage HV_IN increases again, by the clamping action of operational transconductance amplifier OTA, from the current constant that the 4th N-type high-voltage tube MN4 and resistance R5 flows away.When input voltage HV_IN is by high step-down, reduce from the electric current that the 4th N-type high-voltage tube MN4 and resistance R5 flows away, opened by 3rd N-type high-voltage tube MN3 by the second comparator COMP2 and logic control circuit Control Logic, the 3rd light-emitting diode L3 is not luminous again; When input voltage HV_IN continues step-down, opened by the second N-type high-voltage tube MN2 by the first comparator COMP1 and logic control circuit Control Logic, the second light-emitting diode L2 is not luminous, only has the first light-emitting diode L1 luminous.
In sum, along with the change of input voltage HV_IN, repeat the above-mentioned course of work, finally obtain the drive current that is followed input voltage linear change, thus drive different LED array, in its course of work, drive current waveform as shown in Figure 2.
In Fig. 2, the ac line voltage that figure (a) is 220V, the voltage of figure (b) is obtained through full-wave rectification, the i.e. input voltage HV_IN of Fig. 1, just can be obtained the drive current of figure (c) by the LED drive circuit circuit of Fig. 1 high power factor: first paragraph 10mA electric current flows to node V1 by node VHV_IN, finally flow into ground; Second segment 20mA electric current flows to node V2 by node VHV_IN, finally flows into ground; 3rd section of 30mA electric current flows to node V3 by node VHV_IN, finally flows into ground.
What describe in above-described embodiment and specification just illustrates principle of the present utility model and most preferred embodiment; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.
Claims (1)
1. a LED illumination drive circuit for high power factor, comprises 4 N-type high-voltage tubes, 5 resistance, 1 Zener diode, 3 high-voltage LEDs, 2 comparators, 1 operational transconductance amplifier, 1 control logic circuit, it is characterized in that:
The base stage of the first N-type high-voltage tube MN1, one end of resistance R1 are connected with the negative electrode of the 0th diode D0; Source electrode, resistance R2 one end of first N-type high-voltage tube MN1 are connected with output port VDD; The grid of the second N-type high-voltage tube MN2, the grid of the 3rd N-type high-voltage tube MN3, the output of the first comparator COMP1, the output of the second comparator COMP2 are connected with control logic circuit Control Logic; The drain electrode of the second N-type high-voltage tube MN2 is connected with the anode of the negative electrode of the first light-emitting diode L1, the second light-emitting diode L2; The source electrode of the second N-type high-voltage tube MN2 is connected with one end of resistance R3; The drain electrode of the 3rd N-type high-voltage tube MN3 is connected with the anode of the negative electrode of the second light-emitting diode L2, the 3rd light-emitting diode L3; The source electrode of the 3rd N-type high-voltage tube MN3, one end of resistance R4 are connected with the reverse input end of the first comparator COMP1; The drain electrode of the 4th N-type high-voltage tube MN4 is connected with the negative electrode of the 3rd light-emitting diode L3; The reverse input end of the source electrode of the 4th N-type high-voltage tube MN4, one end of resistance R5, operational transconductance amplifier OTA, the reverse input end of the second comparator COMP2 connect; The grid of the 4th N-type high-voltage tube MN4 is connected with the output of operational transconductance amplifier OTA; The positive input of operational transconductance amplifier OTA is connected with reference voltage V ref1; The positive input of the first comparator COMP1, the positive input of the second comparator COMP2 are connected with reference voltage V ref2;
The anode of the drain electrode of the first N-type high-voltage tube MN1, the other end of resistance R1, the first light-emitting diode L1 is connected with power supply HV_IN;
The other end of the anode of the 0th diode D0, the other end of resistance R2, resistance R3, the other end of resistance R4, the other end of resistance R5 are connected with ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420719375.9U CN204206569U (en) | 2014-11-27 | 2014-11-27 | A kind of linear LED drive circuit of high power factor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420719375.9U CN204206569U (en) | 2014-11-27 | 2014-11-27 | A kind of linear LED drive circuit of high power factor |
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| CN204206569U true CN204206569U (en) | 2015-03-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
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2014
- 2014-11-27 CN CN201420719375.9U patent/CN204206569U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
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Address after: 510663 C2, building 182, science Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 1003, China Patentee after: GUANGZHOU REACH MICRO-ELECTRONICS TECHNOLOGY Co.,Ltd. Address before: No. 3 international business incubator G 510663 area in Guangdong city of Guangzhou province Luogang District Science City Moon road 209 Patentee before: GUANGZHOU REACH MICRO-ELECTRONICS TECHNOLOGY Co.,Ltd. |