CN113543409A - Driving power supply of LED lamp - Google Patents
Driving power supply of LED lamp Download PDFInfo
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- CN113543409A CN113543409A CN202110897961.7A CN202110897961A CN113543409A CN 113543409 A CN113543409 A CN 113543409A CN 202110897961 A CN202110897961 A CN 202110897961A CN 113543409 A CN113543409 A CN 113543409A
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- 238000002955 isolation Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 100
- 230000003287 optical effect Effects 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 claims description 6
- 101150102866 adc1 gene Proteins 0.000 claims description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 6
- 102200127268 rs137853826 Human genes 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 10
- 102220549987 Usher syndrome type-1C protein-binding protein 1_Q15A_mutation Human genes 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 101150113941 trt1 gene Proteins 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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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
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- 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
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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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]
-
- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a driving power supply of an LED lamp, which comprises: the EMC circuit filters electromagnetic interference and protects a power supply; the rectifying circuit is used for converting the input alternating voltage into direct voltage and outputting the direct voltage, and is connected with the EMC circuit; the PFC driving circuit outputs constant 720V voltage and is connected with the rectifying circuit; the auxiliary power supply circuit converts the 720V power supply into 12V and 18V power supplies for subsequent circuits; the isolation driving circuit outputs a driving power supply and drives a load and is connected with the PFC driving circuit; the main driving circuit controls the output of the isolation driving circuit; an isolation current detection circuit that detects an output current; a voltage loop control circuit for stabilizing the output voltage; the current loop control circuit is used for stably outputting current; the protection circuit comprises an overvoltage protection circuit and an overcurrent protection circuit; the invention realizes the lighting of the 480V area by the LED by a simple scheme, saves resources and has good market application value.
Description
Technical Field
The invention relates to the technical field of power supply driving, in particular to a driving power supply of an LED lamp.
Background
With the scientific development and the requirements of energy conservation and environmental protection, the LED illumination gradually rises, in recent years, with the development of the photoelectric technology, the brightness and the efficiency of the light emitting diode are also greatly improved, so that the application of the light source in facility agricultural production becomes feasible, and particularly, the light source is a very suitable artificial light source for closed and controllable facility agricultural environments such as plant factories, tissue culture rooms, plant growth chambers and the like.
Disclosure of Invention
The invention provides a driving power supply of an LED lamp, aiming at the defects of the existing driving power supply of the LED lamp.
The technical scheme adopted by the invention for solving the technical problems is as follows:
provided is a driving power supply of an LED lamp, including: the EMC circuit filters electromagnetic interference and protects a power supply; the rectifying circuit is used for converting the input alternating voltage into direct voltage and outputting the direct voltage, and is connected with the EMC circuit; the PFC driving circuit outputs constant 720V voltage and is connected with the rectifying circuit; the auxiliary power supply circuit converts the 720V power supply into 12V and 18V power supplies for subsequent circuits; the isolation driving circuit outputs a driving power supply and drives a load and is connected with the PFC driving circuit; the main driving circuit controls the output of the isolation driving circuit; an isolation current detection circuit that detects an output current; the voltage ring control circuit is used for stabilizing output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stably outputting current and is connected with the isolation driving circuit; and the protection circuit is respectively connected with the isolation drive circuit and the main drive circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit.
Further, the EMC circuit comprises a power interface DA1, pins 1 and 2 of the power interface DA1 are respectively connected with the first ends of fuses F1 and F2, the second ends of the fuse tubes F1 and F2 are respectively connected with pins 2 and 3 of a common-mode inductor L4, a capacitor X3 and a capacitor X4 are connected in series to form a capacitor group, a piezoresistor T5 and an anti-detonator T7 form a first lightning protection circuit, piezoresistors T3 and T4 and an anti-detonator T6 form a second lightning protection circuit, the capacitor bank, the first lightning protection circuit, the second lightning protection circuit and the piezoresistor T8 are respectively arranged between the second ends of the fuse tubes F1 and F2, pins 1 and 4 of the common-mode inductor L4 are respectively connected with pins 2 and 3 of a common-mode inductor L2, capacitors X1 and X2 are arranged between pins 1 and 4 of the common-mode inductor L4 after being connected in series, and pins 1 and 4 of the common-mode inductor L2 are respectively connected with pins 1 and 2 of a connector J1.
Further, the rectifier circuit comprises a chip D1, a first lead of a 4-pin of the chip D1 is connected with a 1-pin of the connector J1, a second lead is connected with an anode of a diode D10, a cathode of the diode D10 is connected with a cathode of a diode D11, an anode of a diode D11 is connected with a 2-pin of the connector J1, a 2-pin of the chip D1 is connected with a 3-pin of a relay VR1, a 4-pin of the relay VR1 is connected with a 2-pin of the connector J1, thermistors TT2 and TT2A are connected in series and then arranged between the 3-pin and the 4-pin of the relay VR1, a 1-pin of the relay VR1 is connected with a 12V power supply, the 2-pin is grounded, a diode D8 and a capacitor C15 are respectively arranged between the 1-pin and the 2-pin of the VR1, a 3-pin of the chip D1 is grounded, a first lead of the 1-pin is connected with the power supply ADC1, and a second lead is grounded through capacitors C2 and C1.
Further, the PFC driving circuit includes an inductor L1, a MOS transistor Q1, a thyristor TR1, a chip U1, and a chip U2, wherein a first end of the inductor L1 is connected to the ADC1, a first lead of a second end of the inductor L1 is connected to an anode of a diode D2, a second lead is connected to a drain of the MOS transistor Q1, a cathode of the diode D2 is connected to a pin 1 of a varistor TT1, a pin 2 of the varistor TT1 is connected to a 720V power supply, pins 1 and 8 of the chip U1 are connected to an 18V power supply, filter capacitors C7, C8 are respectively disposed between the 18V power supply and ground, pins 7 and 8 of the chip U8 are connected to a first end of a resistor R8, a first lead of a second end of the resistor R8 is connected to a first end of a transistor R8 through a base of the diode D8, a collector of the transistor Q8, and an emitter of the transistor Y8 and a collector of the transistor Y8, a second end of the resistor R15 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to a first end of the capacitor Y1B, a second end of the capacitor Y1B is grounded, a diode D13 and a resistor R22 are respectively disposed between the gate of the MOS transistor Q1 and the first end of the capacitor Y1B, a 2 pin of the chip U1 is connected to the first end of the resistor R31 through a resistor R21 and a diode D12 connected in parallel, a second end of the resistor R31 is connected to an 8 pin of the chip U31, a 5 pin of the chip U31 is connected to a cathode of the diode D31 through resistors R31, a 4 pin of the chip U31 is connected to a power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group 720V, the first resistor group includes the resistors R31 and R31 connected in parallel, the second resistor group includes the resistors R31 and the fourth resistor group 31 connected in parallel, the resistor group 31 includes the resistor R31 and the resistor group 31 connected in parallel, and the resistor group includes a resistor group 31 connected in series, and the resistor group 31 connected in parallel, and the resistor group includes a resistor group including the resistor R31 connected in parallel, and the resistor group, R32, R28, R20, R11 and R5, a pin 1 of the controllable silicon TR1 is connected with a 720V power supply, a first lead wire of a pin 3 of the controllable silicon TR1 is connected with a first end of the capacitor Y1B through a capacitor C14, a second lead wire is connected with the 720V power supply through a resistor R10, a capacitor C4 and a capacitor C5, the model of the chip U1 is TC4420, and the model of the chip U2 is ICE3PCS 03G.
Further, the auxiliary power circuit includes a transformer T2, a chip U9 and a MOS transistor Q10, pins 1 and 3 of the transformer T2 are connected to the 720V input power, pins 4 and 5 of the transformer T2 are connected to the 25VB and the 18VDC, and pins 6 and 7 are connected to the 5VV9, 8 and 11 of the transformer T2, pins 12V1, 12 and 14 are connected to the 12V2, pin 3 of the chip U9 is connected to a first end of a resistor R101, a first lead of a second end of the resistor R101 is connected to a cathode of a diode D27, a second lead is connected to a base of a transistor Q11 through a resistor R100, a first lead of an anode of the diode D27 is connected to an emitter of the transistor Q11, a second lead is connected to a first end of a resistor R94, a first lead of a second end of the resistor R94 is connected to a collector of the transistor Q11 through a diode D8 and a resistor R99 connected in parallel, and a gate 10 of the MOS transistor Q11, the drain of MOS pipe Q10 connects the 3 pin of transformer T2, the first lead of the 6 pin of chip U9 connects the 4 pin of transformer T2 through resistance R108, the second lead connects the ground through resistance R122, resistance R124, electric capacity C74 and electric capacity C74A that connect in parallel, the 4 pin of chip U9 connects the first end of resistance R110, the first lead of the second end of resistance R110 connects the drain of MOS pipe Q10, the second lead connects the ground through resistance R119 and R120 that connect in parallel, the 1 pin of chip U9 connects the output end of opto-coupler U10 through capacitance C68 and resistance R112 that connect in parallel, the input termination of opto-coupler U10 the power 12V 2.
Further, the isolation driving circuit includes a chip U12, MOS transistors Q13 and Q15, and a transformer TR1, wherein pins 1 and 2 of the chip U12 are input terminals for receiving the PWM signal sent by the main driving circuit, pins 15 and 10 of the chip U12 are output terminals, pin 15 of the chip U12 is connected to the first terminal of a resistor R131, the first lead of the second terminal of the resistor R131 is connected to the cathode of a diode D32, the second lead is connected to the base of a triode Q14 through a resistor R138, the emitter of the triode Q14 and the anode of the diode D32 are respectively connected to the gate of the MOS transistor Q13, a resistor R136 is connected in parallel to both ends of the diode D32, the source of the MOS transistor Q13 is connected to pin 1 of an inductor L5, the drain is connected to a 720V power supply, the diode D16 and the resistor R137 are respectively disposed between the gate and the source of the MOS transistor Q13, the pin 10 of the chip U12 is connected to the first terminal of the resistor R154, the first terminal of the lead R154 is connected to the cathode of the diode D40, the second lead is connected with the base electrode of a triode Q16 through a resistor R162, the emitter electrode of the triode Q16 and the anode electrode of a diode D40 are respectively connected with the grid electrode of the MOS tube Q15, a resistor R152 is connected with the two ends of the diode D32 in parallel, the drain of the MOS transistor Q15 is connected to the 1 pin of the inductor L5, the source is grounded, the diode D43 and the resistor R155 are respectively arranged between the gate and the source of the MOS transistor Q15, a pin 2 of the inductor L5 is connected with a pin 1 of the transformer TR1 through an inductor L7, a pin 8 of the transformer TR1 is connected with a pin 4 of the inductor L6 through a fifth resistor group and a capacitor C84, the fifth resistor group consists of resistors R128, R129, R127 and R126, the 1 pin of the inductor L6 is connected to ground through the parallel resistors R143 and R147, the 3 pin is connected to the output terminal 1A, the first lead of the 2-pin of the inductor L6 is grounded through a capacitor Y1C, the second lead is connected with an output terminal 1B, and the model of the chip U12 is SI 8233.
Further, the main driving circuit comprises a chip U15, wherein 11 pin of the chip U15 is connected with 2 pin of the chip U12 through a resistor R159, 15 pin of the chip U15 is connected with 1 pin of the chip U12 through a resistor R151, 16 pin of the chip U15 is connected with 14 pin of the chip U15 through parallel capacitors C101 and C103, 14 pin of the chip U15 is connected with a collector of a transistor Q17, an emitter of the transistor Q17 is connected with 1 pin of the chip U12 through a resistor R153, a base of the transistor Q17 is connected with an anode of a diode D44 through a resistor R161, a cathode of the diode D44 is connected with an anode of a diode D41, a first lead of a cathode of the diode D41 is connected with a cathode of a diode D37, a second lead of the diode D34, a first lead of an anode of the diode D37 is connected with a ground through a diode D38, a second lead of the inductor L594, and a first lead of the diode D35 of the diode L5 is connected with a ground, the second lead is connected with the 3 pins of the inductor L5, the capacitor C88 is arranged between the 3 pins and the 4 pins of the inductor L5, and the model of the chip U15 is L6599.
Further, the isolation current detection circuit comprises an inductor L8, a pin 1 of the inductor L8 is connected with a pin 3 of the transformer TR1, a pin 2 is connected with the ground through capacitors C98 and C100 which are connected in parallel, a resistor R163 is arranged between pins 3 and 4 of the inductor L8, the first lead of the 3-pin of the inductor L8 is grounded through a diode D46, the second lead is connected with the first end of a resistor R175 through a diode D48, the second end of the resistor R175 is connected with the 6 pin of the chip U15, the first lead of the 3 pin of the inductor L8 is grounded through a diode D47, the second lead is connected with the first end of the resistor R175 through a diode D49, the third lead is connected with the first end of a capacitor C112 through a resistor R171, the first lead of the second end of the capacitor C112 is connected with the first end of a resistor R179 through a diode D52 and a resistor R182, the second lead is connected with the first end of the resistor R179 through a diode D54 and a resistor R192, and the second end of the resistor R179 is connected with the 6-pin of the chip U15.
Further, the voltage loop control circuit includes chips U16A, U22AB and U16B, the 7 pin of the chip U16A is connected to the input terminal of the optocoupler U20 through a resistor R196 and a diode D59, the output terminal of the optocoupler U20 is connected to the first terminal of a resistor R210, the second terminal of the resistor R210 is connected to the 4 and 5 pins of the chip U15 through resistors R185 and R186, respectively, the first lead of the 6 pin of the chip U16A is connected to the 1 pin of the inductor L6 through a resistor R187, the second lead is connected to the 1 pin of the chip U22AB through resistors R183, R172 and R169, a capacitor C126 and a resistor R202 are connected in series and then disposed between the 6 and 7 pins of the chip U16A, the 5 pin of the chip U22AB is connected to the 1 pin of the chip U16B, the 2 pin of the chip U16B is connected to the ground through a capacitor C108 and a resistor R167 in parallel, a resistor R166 is disposed between the 1 pin of the chip U582 pin of the chip U16 and the input pin 583, the current loop control circuit comprises a chip U17A, a chip U22AA and a chip U17B, wherein a pin 1 of the chip U17B is connected with an input end of the optical coupler U20 through a resistor R221 and a diode D61, the first lead of the 2 pins of the chip U17B is connected with the load end through resistors R226, R228 and R227, the second lead is connected with the 1 pin of the chip U22AA through resistors R216 and R2099, a capacitor C137 is arranged between the 1 and 2 pins of the chip U17B, a capacitor C135 and a resistor R219 are connected in series and then arranged between the 1 and 2 pins of the chip U17B, the 3 pins of the chip U22AA are connected to the 7 pins of the chip U17A, the 6 pins of the chip U17A are connected to ground through a capacitor C131 and a resistor R208 which are connected in parallel, the 5 th pin of the chip U17A is connected to the output terminal 1A through a resistor R193, a diode D55 and a diode D57 are connected in series and then are arranged between the 7 th pin and the 5 th pin of the chip U17A, the model of the chips U16A, U16B, U17A and U17B is TSX393, and the model of the chips U22AA and U22AB is LM 358.
Further, the over-voltage protection circuit includes chips U23A, U23B and a transistor Q5A, the 2 pin of the chip U23B is connected to the output terminal 1B through resistors R17 and R8, the 1 pin is connected to the 5 pin of the chip U23A, a resistor R13 and a capacitor C17 are connected in series and disposed between the 1 and 2 pins of the chip U23B, the 7 pin of the chip U23A is connected to the base of the transistor Q5A through a resistor R16, the emitter of the transistor Q5A is connected to ground, the collector is connected to the 7 pin of the chip U15, the types of the chips U23A and U23B are x393, the over-current protection circuit includes chips U19A and U19B, the 1 pin of the chip U19A is connected to the 1 pin of the inductor L6 through a resistor R205, the 1 pin of the chip U19A is connected to ground, the 3 pin of the chip U19A is connected to the input terminal of the resistor U19R A and the input terminal A of the diode A, the resistor R214 is arranged between pins 4 and 5 of the chip U19B, the output end of the optical coupler U21 is connected with pin 12 of the chip U15, and the models of the chips U19A and U19B are TS 102A.
Compared with the prior art, the invention has the beneficial effects that:
1. the 480V voltage of the industrial area can also be illuminated by adopting an LED through isolated driving, so that energy is saved;
2. the EMC circuit can filter out interference signals and protect the power supply from being struck by lightning;
3. the power supply output is stabilized through the voltage loop control circuit and the current loop control circuit;
4. the overvoltage protection circuit and the overcurrent protection circuit can prevent the LED illuminating lamp beads from being damaged due to overhigh output, and the service life of the power supply is prolonged.
Drawings
FIG. 1 is a schematic diagram of the principle structure of the EMC circuit of the present invention;
FIG. 2 is a schematic diagram of a schematic structure of a rectifier circuit of the present invention;
FIG. 3 is a schematic diagram of the PFC driving circuit according to the present invention;
FIG. 4 is a schematic diagram of the schematic structure of the auxiliary power circuit of the present invention;
FIG. 5 is a schematic diagram of the isolation driving circuit of the present invention;
FIG. 6 is a schematic diagram of the principal structure of the main driving circuit of the present invention;
FIG. 7 is a schematic diagram of the isolation current detection circuit according to the present invention;
FIG. 8 is a schematic diagram of the schematic structure of the voltage loop and current loop control circuit of the present invention;
FIG. 9 is a schematic diagram of the overvoltage protection circuit of the present invention;
fig. 10 is a schematic structural diagram of the overcurrent protection circuit of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are shown in the drawings, but the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings, and in embodiment 1, as shown in fig. 1 to 9, there is provided a driving power supply for an LED lamp, including: the EMC circuit filters electromagnetic interference and protects a power supply; the rectifying circuit is used for converting the input alternating voltage into direct voltage and outputting the direct voltage, and is connected with the EMC circuit; the PFC driving circuit outputs constant 720V voltage and is connected with the rectifying circuit; the auxiliary power supply circuit converts the 720V power supply into 12V and 18V power supplies for subsequent circuits; the isolation driving circuit outputs a driving power supply and drives a load and is connected with the PFC driving circuit; the main driving circuit controls the output of the isolation driving circuit; an isolation current detection circuit that detects an output current; the voltage ring control circuit is used for stabilizing output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stably outputting current and is connected with the isolation driving circuit; and the protection circuit is respectively connected with the isolation drive circuit and the main drive circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit.
In this embodiment, a power interface DA1 inputs a 480VAC voltage port, fuses F1 and F2 can prevent overcurrent, a varistor T8 can prevent surge voltage, an X3 capacitor and an X4 capacitor are connected in series to have an EMI effect, and can filter various interference signals coming from a power grid, a first lightning protection circuit is lightning-proof 10KV to protect an electric power supply from being damaged, in a second lightning protection circuit, the varistor T4, the T3 and a detonator T6 form a T-type circuit to prevent 6KV lightning, a double-layer protection power supply is not struck by lightning through the first lightning protection circuit and the second lightning protection circuit, common-mode inductors L4 and L2, capacitors X1 and X2 form a double-pass EMC circuit to prevent equipment from generating electromagnetic interference.
In this embodiment, the chip D1 is a rectifier bridge of model D25SB100, which can convert 480V ac power into dc power, and the thermistors TT2 and TT2A, the relay VR1, and the capacitor C15 form an input voltage buffer circuit, which can protect the elements in the circuit.
In embodiment 4, as shown in fig. 2-3, the PFC driving circuit includes an inductor L1, a MOS transistor Q1, a thyristor TR1, and chips U1 and U2, a first terminal of the inductor L1 is connected to the power ADC1, a first terminal of a second terminal of the inductor L1 is connected to an anode of a diode D2, a second terminal of the inductor L1 is connected to a drain of the MOS transistor Q1, a cathode of the diode D2 is connected to a pin 1 of a varistor TT1, a pin 2 of the varistor TT1 is connected to a power supply of 720V, pins 1 and 8 of the chip U1 are connected to a power supply of 18V, filter capacitors C7, C8, C9 and C10 are respectively disposed between the power supply of 18V and ground, pins 7 and 8 of the chip U1 are connected to a first terminal of a resistor R1, a first terminal of a second terminal of the resistor R1 is connected to a collector of a transistor Q1, a base of the transistor Q1, an emitter of the resistor R15 is connected to a first end of the resistor R15, a second end of the resistor R15 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to a first end of the capacitor Y1B, a second end of the capacitor Y1B is connected to ground, a diode D13 and a resistor R22 are respectively disposed between a gate of the MOS transistor Q1 and a first end of the capacitor Y1B, a 2 pin of the chip U1 is connected to a first end of the resistor R12 through a resistor R21 and a diode D12 connected in parallel, a second end of the resistor R12 is connected to an 8 pin of the chip U12, a 5 pin of the chip U12 is connected to a cathode of the diode D12 through resistors R12, a 4 pin of the chip U12 is connected to a power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group 720V, the first resistor R12 and the second resistor group 12 and the resistor group 12 connected in parallel include the resistor R12, the resistor group 12 and the resistor group 12 connected in parallel, the resistor group 12 and the resistor group 12 connected in parallel connection includes the resistor group 12, the fourth resistor group comprises resistors R36, R32, R28, R20, R11 and R5 which are connected in series, a pin 1 of the controlled silicon TR1 is connected with a 720V power supply, a first lead wire of a pin 3 of the controlled silicon TR1 is connected with a first end of the capacitor Y1B through a capacitor C14, a second lead wire is connected with the 720V power supply through the resistor R10, the capacitor C4 and the capacitor C5, the model of the chip U1 is TC4420, and the model of the chip U2 is ICE3PCS 03G.
In this embodiment, inductor L3, chips U3 and U3, MOS transistor Q3, diode D3 form a boss circuit, which can output constant voltage 720VDC, the output terminal of chip U3 drives MOS transistor Q3, the power supply terminal of chip U3 is provided with filter capacitors C3, C3 and C3, which can prevent interference, 5 pins of chip U3 are connected to the cathode of diode D3 through resistors R3, R3 and R3, the input voltage can be detected through diodes D3, D3 and resistor R3, 4 pins of chip U3 can detect the output voltage through the power supply of first resistor group, second resistor group, third resistor group and fourth resistor group 720V, the output voltage can be detected, 8 pins of chip U3 are connected to the input terminal of chip U3, chip U3 controls the output of chip U3 by comparing the detected voltage, so as to ensure constant output voltage, and the output voltage of chip U3, R3, PFC 3 and a first triode 3, the first PFC driving buffer circuit can absorb peak voltage and protect the driving MOS tube Q1 from being damaged, the second PFC driving buffer circuit is composed of the voltage-sensitive voltage TT1, the controlled silicon TRT1, the capacitors C4, C5 and C14, and the second PFC driving buffer circuit can prevent surge current from damaging the MOS tube and prolong the service life of a power supply.
Embodiment 5, as shown in fig. 4, the auxiliary power circuit includes a transformer T2, a chip U9, and a MOS transistor Q10, wherein pins 1 and 3 of the transformer T2 are connected to a 720V input power, pins 4 and 5 of the transformer T2 are connected to a 25VB and a 18VDC, pin 6 and 7 of an output power 5VV9, pin 8 and 11 of output power 12V1, pin 12 and pin 14 of output power 12V2, pin 3 of the chip U9 is connected to a first terminal of a resistor R101, a first terminal of a second terminal of the resistor R101 is connected to a cathode of a diode D27, a second terminal of the resistor R100 is connected to a base of a transistor Q11, a first lead of an anode of the diode D27 is connected to an emitter of the transistor Q11, a first terminal of a second lead resistor R94, a first lead of a second terminal of the resistor R94 is connected to a collector of the transistor Q11 through a diode D28 and a resistor R99 connected in parallel, and a collector of the transistor Q11 is connected to a collector of the MOS transistor Q10, the drain of MOS pipe Q10 connects the 3 pin of transformer T2, the first lead of the 6 pin of chip U9 connects the 4 pin of transformer T2 through resistance R108, the second lead connects the ground through resistance R122, resistance R124, electric capacity C74 and electric capacity C74A that connect in parallel, the 4 pin of chip U9 connects the first end of resistance R110, the first lead of the second end of resistance R110 connects the drain of MOS pipe Q10, the second lead connects the ground through resistance R119 and R120 that connect in parallel, the 1 pin of chip U9 connects the output end of opto-coupler U10 through capacitance C68 and resistance R112 that connect in parallel, the input termination of opto-coupler U10 the power 12V 2.
In this embodiment, the transformer T2 converts the 720V power supply into an auxiliary power supply required by a subsequent circuit chip, the 6 pin of the chip U9, the resistors R108, R123, R124, the capacitors C74, C74A constitute a voltage detection circuit, the 4 pin of the chip U9, the resistors R120, R190, R110 constitute a current detection circuit, the 3 pin of the chip U9 outputs a PWM switching signal, the PWM switching signal is transmitted to the gate of the MOS transistor Q10 through the resistors R101, R94, R10, the transistor Q11, the diodes D17, D23, the drain of the MOS transistor Q10 is connected to the input of the transformer T2, so that the auxiliary power supply is stabilized, and the resistors R101, R94, R10, the transistor Q11, the diodes D17, and D23 constitute a peak protection network for protecting the MOS transistor Q10.
In this embodiment, pins 1 and 2 of a chip U12 are input terminals for receiving a PWM signal sent by the main driving circuit, pins 15 and 10 of a chip U12 are output terminals for outputting a signal to G electrodes of MOS transistors Q13 and Q15 to operate the MOS transistors switches, thereby controlling voltage output, a first isolation driving voltage peak limiting circuit is formed by resistors R136, R137, R138, a diode D36 and a transistor Q14 to protect the MOS transistor Q13 from peak voltage loss, a second isolation driving voltage peak limiting circuit is formed by resistors R152, R155, R162, a diode D42 and the transistor Q15 to protect the MOS transistor Q15 from peak voltage loss, and output terminals 1A and 1B are connected to the LED lighting device.
In this embodiment, the output PWM signals from the pins 11 and 15 of the chip U15 are transmitted to the pins 1 and 2 of the chip U12 through the resistors R151 and R159, respectively, to drive the chip U12, and the isolated current detection inductor L5, the diodes D34, D35, D37, D38, D41, D44, the resistors R161, R153, and the transistor Q17 form a current detection network.
Embodiment 8, as shown in fig. 5-7, the isolation current detection circuit includes an inductor L8, a pin 1 of the inductor L8 is connected to a pin 3 of the transformer TR1, a pin 2 is connected to ground through parallel capacitors C98 and C100, a resistor R163 is disposed between pins 3 and 4 of the inductor L8, a first pin of the pin 3 of the inductor L8 is connected to ground through a diode D46, a second pin is connected to a first terminal of a resistor R175 through a diode D48, a second terminal of the resistor R175 is connected to a pin 6 of the chip U15, a first pin of the pin 3 of the inductor L8 is connected to ground through a diode D47, a second pin is connected to a first terminal of the resistor R175 through a diode D49, a third pin is connected to a first terminal of a capacitor C112 through a resistor R171, a first pin of a second terminal of the capacitor C112 is connected to a first terminal of a resistor R179 through a diode D52 and a resistor R192, a second pin is connected to a first terminal of the resistor R179 through a diode D54 and a resistor R192, the second terminal of the resistor R179 is connected to the 6 pin of the chip U15.
In this embodiment, the detection inductor L8, and the diode, the resistor, and the capacitor connected thereto constitute an isolation current detection circuit, and the 6 pin of the chip U15 detects the output current through the isolation current detection circuit, in this embodiment, the chip U15 is protected from operating in a safe region by using the isolation current mutual inductance L8.
Embodiment 9, as shown in fig. 8, the voltage loop control circuit includes chips U16A, U22AB and U16B, the 7 th pin of the chip U16A is connected to the input terminal of the optocoupler U20 through a resistor R196 and a diode D59, the output terminal of the optocoupler U20 is connected to the first terminal of a resistor R210, the second terminal of the resistor R210 is connected to the 4 th and 5 th pins of the chip U15 through resistors R185 and R186, respectively, the first lead of the 6 th pin of the chip U16A is connected to the 1 st pin of the inductor L6 through a resistor R187, the second lead is connected to the 1 st pin of the chip U22AB through resistors R183, R172 and R169, a capacitor C126 and a resistor R202 are connected in series and then disposed between the 6 th and 7 th pins of the chip U16A, the 5 th pin of the chip U22AB is connected to the 1 st pin of the chip U16, the 2 nd pin of the chip B is connected to the ground through a capacitor C108 and a resistor R167, and a resistor R166 are disposed between the input pin of the PWM chip U5816 and the input pin 1 of the chip U16, the current loop control circuit comprises a chip U17A, a chip U22AA and a chip U17B, wherein a pin 1 of the chip U17B is connected with an input end of the optical coupler U20 through a resistor R221 and a diode D61, the first lead of the 2 pins of the chip U17B is connected with the load end through resistors R226, R228 and R227, the second lead is connected with the 1 pin of the chip U22AA through resistors R216 and R2099, a capacitor C137 is arranged between the 1 and 2 pins of the chip U17B, a capacitor C135 and a resistor R219 are connected in series and then arranged between the 1 and 2 pins of the chip U17B, the 3 pins of the chip U22AA are connected to the 7 pins of the chip U17A, the 6 pins of the chip U17A are connected to ground through a capacitor C131 and a resistor R208 which are connected in parallel, the 5 th pin of the chip U17A is connected with the input signal PWM2 through a resistor R193, diodes D55 and D57 are connected in series and then are arranged between the 7 th pin and the 5 th pin of the chip U17A, the model of the chips U16A, U16B, U17A and U17B is TSX393, and the model of the chips U22AA and U22AB is LM 358.
In this embodiment, the chip U16B, the resistor R166, the resistor R168, and the capacitor C108 form an integral comparator, the chip U22AB is a voltage follower, which can increase the frequency response, and the chip U16A and the capacitor C126X form a voltage control loop, which can stabilize the output voltage; the chip U17A and the resistor R204 form an integral circuit, which has the function of increasing frequency compensation, the chip U22AA is a voltage follower, which can increase frequency response, and the chip U17B, the capacitor C137, the capacitor C135 and the resistor R219 form a current control loop, so that the current output is linearly changed.
In embodiment 10, as shown in fig. 9-10, the overvoltage protection circuit includes a chip U23A, a chip U23B and a transistor Q5A, a 2 pin of the chip U23B is connected to the output terminal 1B through resistors R17 and R8, a1 pin is connected to a 5 pin of the chip U23A, a resistor R13 and a capacitor C17 are connected in series and disposed between the 1 and 2 pins of the chip U23B, a 7 pin of the chip U23A is connected to the base of the transistor Q5A through a resistor R16, an emitter of the transistor Q5A is connected to ground, a collector of the transistor Q5 is connected to a 7 pin of the chip U15, the types of the chips U23A and U23B are x393, the overcurrent protection circuit includes chips U19A and U19B, a1 pin of the chip U19 is connected to a1 pin of the inductor L6 through a resistor R201, a 8 pin is connected to ground through a resistor R205, a 3 pin of the chip U19 and U19R A pin of the resistor U19 is connected to the input terminal of the chip U A and the input terminal of the diode U A, the resistor R214 is arranged between pins 4 and 5 of the chip U19B, the output end of the optical coupler U21 is connected with pin 12 of the chip U15, and the models of the chips U19A and U19B are TS 102A.
In the embodiment, when the output voltage is too high, a signal of the output voltage is transmitted to the 2 pin of the U23B through the resistor R17, the 2 pin of the U23B is compared with the 3 pin in potential and then outputs a high potential, a voltage follower formed by the U23A outputs a high level to drive the base electrode of the triode Q15A, the triode Q15A is conducted, the potential of the 7 pin of the U15 is pulled down, and when the potential of the 7 pin of the U15 is less than 0.7V, the U15 stops working, so that high voltage cannot be output, the LED illuminating lamp can be prevented from being damaged by the output high voltage, and the service life of a power supply is also protected; in the overcurrent protection circuit, the chips U19A, U19B and the diode D60 form an output current detection network, detected information is transmitted to the optical coupling U21, when the output current is too high, the output of the optical coupling U21 enables the working voltage of the chip U15 to be reduced, and the output current does not exceed the current range driven by the LED.
The working principle of the invention is as follows:
the industrial power supply is connected with an EMC circuit 480VAC, the rectifying circuit converts input alternating voltage into direct voltage and outputs the direct voltage to the PFC driving circuit, in the PFC driving circuit, the output end of a chip U1 drives an MOS tube Q1 to output constant 720V voltage, an auxiliary power circuit can convert the 720V power into 12V and 18V power for subsequent circuits to use, an isolation driving circuit is controlled by a main driving circuit and outputs the driving power to drive an LED lamp load, the voltage loop control circuit and a current loop control circuit stabilize power output, the overvoltage protection circuit and the overcurrent protection circuit can prevent the LED illuminating lamp beads from being damaged due to overhigh output, and the service life of the power supply is prolonged.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A driving power supply of an LED lamp, comprising: the EMC circuit filters electromagnetic interference and protects a power supply; the rectifying circuit is used for converting the input alternating voltage into direct voltage and outputting the direct voltage, and is connected with the EMC circuit; the PFC driving circuit outputs constant 720V voltage and is connected with the rectifying circuit; the auxiliary power supply circuit converts the 720V power supply into 12V and 18V power supplies for subsequent circuits; the isolation driving circuit outputs a driving power supply and drives a load and is connected with the PFC driving circuit; the main driving circuit controls the output of the isolation driving circuit; an isolation current detection circuit that detects an output current; the voltage ring control circuit is used for stabilizing output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stably outputting current and is connected with the isolation driving circuit; and the protection circuit is respectively connected with the isolation drive circuit and the main drive circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit.
2. The driving power supply of the LED lamp according to claim 1, wherein the EMC circuit comprises a power interface DA1, pins 1 and 2 of the power interface DA1 are respectively connected with the first ends of fuses F1 and F2, the second ends of the fuse tubes F1 and F2 are respectively connected with pins 2 and 3 of a common-mode inductor L4, a capacitor X3 and a capacitor X4 are connected in series to form a capacitor group, a piezoresistor T5 and an anti-detonator T7 form a first lightning protection circuit, piezoresistors T3 and T4 and an anti-detonator T6 form a second lightning protection circuit, the capacitor bank, the first lightning protection circuit, the second lightning protection circuit and the piezoresistor T8 are respectively arranged between the second ends of the fuse tubes F1 and F2, pins 1 and 4 of the common-mode inductor L4 are respectively connected with pins 2 and 3 of a common-mode inductor L2, capacitors X1 and X2 are arranged between pins 1 and 4 of the common-mode inductor L4 after being connected in series, and pins 1 and 4 of the common-mode inductor L2 are respectively connected with pins 1 and 2 of a connector J1.
3. The power supply of claim 2, wherein the rectifying circuit comprises a chip D1, a first lead of the 4 pins of the chip D1 is connected to the 1 pin of the connector J1, a second lead is connected to the anode of the diode D10, the cathode of the diode D10 is connected to the cathode of the diode D11, the anode of the diode D11 is connected to the 2 pin of the connector J1, the 2 pin of the chip D1 is connected to the 3 pin of the VR1, the 4 pin of the relay VR1 is connected to the 2 pin of the connector J1, thermistors TT2 and TT2A are connected in series and then arranged between the 3 and 4 pins of the relay VR1, the 1 pin of the relay VR1 is connected to the 12V power supply, the 2 pin is connected to the ground, the diode D8 and a capacitor C15 are respectively arranged between the 1 and 2 pins of the relay VR1, the 3 pin of the chip D1 is connected to the ground, the first lead of the 1 pin is connected to the ADC1, the second lead is connected to ground via capacitors C2 and C1.
4. The driving power supply of the LED lamp according to claim 3, wherein the PFC driving circuit comprises an inductor L1, a MOS transistor Q1, a thyristor TR1 and chips U1, U2, a first terminal of the inductor L1 is connected to the power ADC1, a first lead of a second terminal of the inductor L1 is connected to an anode of a diode D2, a second lead is connected to a drain of the MOS transistor Q1, a cathode of the diode D2 is connected to a1 pin of a varistor TT1, a 2 pin of the varistor TT1 is connected to a 720V power supply, 1 and 8 pins of the chip U1 are connected to an 18V power supply, filter capacitors C7, C8, C9 and C10 are respectively disposed between the 18V power supply and ground, pins 7 and 8 of the chip U1 are connected to a first terminal of a resistor R1, a first lead of the second terminal of the resistor R1 is connected to a first terminal of a triode Q1 through a first terminal of the diode D1, a second lead of the triode Y1 and a collector of the transistor Q1, an emitter of the resistor R15 is connected to a first end of the resistor R15, a second end of the resistor R15 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to a first end of the capacitor Y1B, a second end of the capacitor Y1B is connected to ground, a diode D13 and a resistor R22 are respectively disposed between a gate of the MOS transistor Q1 and a first end of the capacitor Y1B, a 2 pin of the chip U1 is connected to a first end of the resistor R12 through a resistor R21 and a diode D12 connected in parallel, a second end of the resistor R12 is connected to an 8 pin of the chip U12, a 5 pin of the chip U12 is connected to a cathode of the diode D12 through resistors R12, a 4 pin of the chip U12 is connected to a power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group 720V, the first resistor R12 and the second resistor group 12 and the resistor group 12 connected in parallel include the resistor R12, the resistor group 12 and the resistor group 12 connected in parallel, the resistor group 12 and the resistor group 12 connected in parallel connection includes the resistor group 12, the fourth resistor group comprises resistors R36, R32, R28, R20, R11 and R5 which are connected in series, a pin 1 of the controlled silicon TR1 is connected with a 720V power supply, a first lead wire of a pin 3 of the controlled silicon TR1 is connected with a first end of the capacitor Y1B through a capacitor C14, a second lead wire is connected with the 720V power supply through the resistor R10, the capacitor C4 and the capacitor C5, the model of the chip U1 is TC4420, and the model of the chip U2 is ICE3PCS 03G.
5. The power supply of claim 4, wherein the auxiliary power circuit comprises a transformer T2, a chip U9 and a MOS transistor Q10, the pins 1 and 3 of the transformer T2 are connected with a 720V input power supply, the pins 4 and 5 of the transformer T2 are connected with a 25VB and a power supply 18VDC, the pin 4 and 5 of the transformer T2 are connected with a 5VV9, a pin 8 and a pin 11 of the output power supplies 12V1, 12 and 14 are connected with a 12V2, the pin 3 of the chip U9 is connected with a first end of a resistor R101, a first lead of a second end of the resistor R101 is connected with a cathode of a diode D27, a second lead is connected with a base of a transistor Q11 through a resistor R100, a first lead of an anode of the diode D27 is connected with an emitter of the transistor Q11, a first end of a second lead R94, a first lead of a second end of the resistor R94 is connected with a collector of the transistor Q11 through a diode D28 and a resistor R99 connected in parallel, the second lead is connected with the grid of the MOS tube Q10, the drain of the MOS tube Q10 is connected with the 3 pin of the transformer T2, the first lead of the 6 pin of the chip U9 is connected with the 4 pin of the transformer T2 through a resistor R108, the second lead is grounded through a resistor R122, a resistor R124, a capacitor C74 and a capacitor C74A which are connected in parallel, the 4 pin of the chip U9 is connected with the first end of a resistor R110, the first lead of the second end of the resistor R110 is connected with the drain of the MOS tube Q10, the second lead is grounded through resistors R119 and R120 which are connected in parallel, the 1 pin of the chip U9 is connected with the output end of an optical coupler U10 through a capacitor C68 and a resistor R112 which are connected in parallel, and the input end of the optical coupler U10 is connected with the power supply 12V 2.
6. The LED lamp driving power supply of claim 5, wherein the isolation driving circuit comprises a chip U12, MOS transistors Q13 and Q15, and a transformer TR1, wherein pins 1 and 2 of the chip U12 are input terminals for receiving the PWM signal transmitted by the main driving circuit, pins 15 and 10 of the chip U12 are output terminals, pin 15 of the chip U12 is connected to a first terminal of a resistor R131, a first lead of a second terminal of the resistor R131 is connected to a cathode of a diode D32, a second lead is connected to a base of a transistor Q14 via a resistor R138, an emitter of the transistor Q14 and an anode of the diode D32 are respectively connected to a gate of the MOS transistor Q13, a resistor R136 is connected in parallel to both terminals of the diode D32, a source of the MOS transistor Q13 is connected to pin 1 of an inductor L5, a drain of the diode D16 and a resistor R137 are respectively disposed between the gate and the source of the MOS transistor Q13, the pin 10 of the chip U12 is connected with a first end of a resistor R154, a first lead of a second end of the resistor R154 is connected with a cathode of a diode D40, a second lead is connected with a base of a triode Q16 through a resistor R162, an emitter of the triode Q16 and an anode of the diode D40 are respectively connected with a grid of the MOS tube Q15, a resistor R152 is connected in parallel with two ends of the diode D32, a drain of the MOS tube Q15 is connected with a pin 1 of the inductor L5, a source is grounded, a diode D43 and a resistor R155 are respectively arranged between a grid and a source of the MOS tube Q15, a pin 2 of the inductor L5 is connected with a pin 1 of a transformer TR1 through an inductor L7, a pin 8 of the transformer TR1 is connected with a pin 4 of an inductor L6 through a fifth resistor group and a capacitor C84, the fifth resistor group is composed of resistors R128, R129, R127 and R126, the pin 1 of the inductor L6 is connected with a ground through a resistor R143 and a pin 147, a ground, a 1A 3 which are connected in parallel with an output terminal A, the first lead of the 2-pin of the inductor L6 is grounded through a capacitor Y1C, the second lead is connected with an output terminal 1B, and the model of the chip U12 is SI 8233.
7. The power supply of claim 6, wherein the main driving circuit comprises a chip U15, the pin 11 of the chip U15 is connected to the pin 2 of the chip U12 through a resistor R159, the pin 15 of the chip U15 is connected to the pin 1 of the chip U12 through a resistor R151, the pin 16 of the chip U15 is connected to the pin 14 of the chip U15 through parallel capacitors C101 and C103, the pin 14 of the chip U15 is connected to the collector of a transistor Q17, the emitter of the transistor Q17 is connected to the pin 1 of the chip U12 through a resistor R153, the base of the transistor Q17 is connected to the anode of the diode D44 through a resistor R161, the cathode of the diode D44 is connected to the anode of the diode D41, the first lead of the cathode of the diode D41 is connected to the cathode of the diode D37, the second lead is connected to the cathode of the diode D34, and the first lead of the anode of the diode D37 is connected to the ground through a diode D38, the second lead is connected with the 4 pins of the inductor L5, the first lead of the anode of the diode D34 is grounded through the diode D35, the second lead is connected with the 3 pins of the inductor L5, the capacitor C88 is arranged between the 3 pins and the 4 pins of the inductor L5, and the model number of the chip U15 is L6599.
8. The power supply of claim 7, wherein the isolation current detection circuit comprises an inductor L8, a pin 1 of the inductor L8 is connected to a pin 3 of the transformer TR1, a pin 2 is connected to ground through parallel capacitors C98 and C100, a resistor R163 is disposed between pins 3 and 4 of the inductor L8, a first lead of the pin 3 of the inductor L8 is connected to ground through a diode D46, a second lead is connected to a first terminal of a resistor R175 through a diode D48, a second terminal of the resistor R175 is connected to a pin 6 of the chip U15, a first lead of the pin 3 of the inductor L8 is connected to ground through a diode D47, a second lead is connected to a first terminal of the resistor R175 through a diode D49, a third lead is connected to a first terminal of a capacitor C112 through a resistor R171, a first lead of a second terminal of the capacitor C112 is connected to a first terminal of a resistor R179 through a diode D52, and a resistor R179 is connected to a first terminal of the resistor R685192, the second terminal of the resistor R179 is connected to the 6 pin of the chip U15.
9. The power supply of claim 8, wherein the voltage loop control circuit comprises U16A, U22AB and U16B, the 7 pins of the U16A are connected to the input terminal of the optical coupler U20 through a resistor R196 and a diode D59, the output terminal of the optical coupler U20 is connected to the first terminal of a resistor R210, the second terminal of the resistor R210 is connected to the 4 and 5 pins of the U15 through resistors R185 and R186, respectively, the first pin of the 6 pins of the U16A is connected to the 1 pin of the inductor L6 through a resistor R187, the second pin is connected to the 1 pin of the U22AB through resistors R183, R172 and R169, a capacitor C126 and a resistor R202 are connected in series and then are disposed between the 6 pin and the 7 pin of the U16A, the 5 pin of the U22AB is connected to the 1 pin of the U16B, the 2 pin of the U16B is connected to the ground through a capacitor C108 and a resistor R167, and a resistor R166 are disposed between the 1 pin of the U16B and the chip 16B, the 3 pin of the chip U16B is connected with the input signal PWM1, the current loop control circuit comprises chips U17A, U22AA and U17B, the 1 pin of the chip U17B is connected with the input end of the optical coupler U20 through a resistor R221 and a diode D61, the first lead of the 2 pin of the chip U17B is connected with the load end through resistors R226, R228 and R227, the second lead is connected with the 1 pin of the chip U22AA through resistors R216 and R2099, a capacitor C137 is arranged between the 1 pin and the 2 pin of the chip U17B, a capacitor C135 and a resistor R219 are connected in series and then arranged between the 1 pin and the 2 pin of the chip U17B, the 3 pin of the chip U22AA is connected with the 7 pin of the chip U17A, the 6 pin of the chip U17A is connected in parallel with a capacitor C131 and a resistor R208 and then connected with ground, the 5 pin of the chip U17U 8 is connected with the output terminal R193 through the output terminal 1A, the diode D356 pin and the chip 3527D and the chip U27 is arranged between the chip U17 73727 and the chip A, and the chip U17A is connected in series and the chip U17, The model numbers of the chips U16B, U17A and U17B are TSX393, and the model numbers of the chips U22AA and U22AB are LM 358.
10. The power supply of claim 1, wherein the over-voltage protection circuit comprises a chip U23A, a chip U23B and a transistor Q5A, wherein 2 pin of the chip U23B is connected to the output terminal 1B through resistors R17 and R8, 1 pin is connected to 5 pin of the chip U23A, a resistor R13 and a capacitor C17 are connected in series and disposed between 1 and 2 pins of the chip U23B, 7 pin of the chip U23A is connected to the base of the transistor Q5A through a resistor R16, the emitter of the transistor Q5A is grounded, the collector is connected to 7 pin of the chip U2, the chip U23A and U23B are TSX393, the over-current protection circuit comprises chips U19A and U19B, 1 pin of the chip U19A is connected to 1 pin of the inductor L6 through a resistor R201, 8 pin is connected to ground through a resistor R205, the chip U19 pin of the chip U19 and U8672 are connected to the input terminal A of the chip U19 and the chip U A through a resistor R3619 and a resistor U A, the resistor R214 is arranged between pins 4 and 5 of the chip U19B, the output end of the optical coupler U21 is connected with pin 12 of the chip U15, and the models of the chips U19A and U19B are TS 102A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113543409B (en) | 2024-01-12 |
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