CN113543409B - Driving power supply of LED lamp - Google Patents

Driving power supply of LED lamp Download PDF

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Publication number
CN113543409B
CN113543409B CN202110897961.7A CN202110897961A CN113543409B CN 113543409 B CN113543409 B CN 113543409B CN 202110897961 A CN202110897961 A CN 202110897961A CN 113543409 B CN113543409 B CN 113543409B
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pin
resistor
chip
diode
lead
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CN202110897961.7A
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CN113543409A (en
Inventor
羊红军
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Shenzhen Shenchuan Intelligent Co ltd
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Shenzhen Shenchuan Intelligent Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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]
    • 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: EMC circuit, filter electromagnetic interference, protect the power; the rectification circuit converts the input alternating voltage into direct voltage and outputs 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 720V power supply into 12V and 18V power supply for the subsequent circuit; the isolation driving circuit outputs a driving power supply to drive 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 for detecting an output current; a voltage loop control circuit for stabilizing the output voltage; a current loop control circuit for stabilizing the output current; the protection circuit comprises an overvoltage protection circuit and an overcurrent protection circuit; the invention realizes the illumination of the 480V area by using the LED with a simple scheme, saves resources and has good market application value.

Description

Driving power supply of LED lamp
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 development of science and the demand of energy conservation and environmental protection, the illumination of the LED is gradually raised, and with the development of photoelectric technology, the brightness and efficiency of the LED are also greatly improved, so that the application of the light source in the production of facility agriculture becomes feasible, and especially, the light source is a very suitable artificial light source for closed and controllable facility agriculture environments such as plant factories, tissue culture chambers, plant growth boxes and the like, and the artificial light source commonly adopted by industrial electricity is a fluorescent lamp and a high-voltage sodium lamp at the present stage, and the LED power supply driving conforming to 480VAC voltage on the market is basically not available because the industrial electricity is generally about 380-480V, and the development of the driving power supply directly influences the popularization and popularization of the LED.
Disclosure of Invention
Aiming at the defects of the driving power supply of the existing LED lamp, the invention provides the driving power supply of the LED lamp.
The technical scheme adopted for solving the technical problems is as follows:
provided is a driving power supply for an LED lamp, comprising: EMC circuit, filter electromagnetic interference, protect the power; the rectification circuit converts the input alternating voltage into direct voltage and outputs 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 720V power supply into 12V and 18V power supply for the subsequent circuit; the isolation driving circuit outputs a driving power supply to drive 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 for detecting an output current; the voltage ring control circuit stabilizes output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stabilizing output current and is connected with the isolation driving circuit; and the protection circuit is respectively connected with the isolation driving circuit and the main driving circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit.
Further, the EMC circuit includes a power interface DA1, the 1 and 2 pins of the power interface DA1 are respectively connected with the first ends of the insurance tubes F1 and F2, the second ends of the insurance tubes F1 and F2 are respectively connected with the 2 and 3 pins of the common-mode inductor L4, the capacitors X3 and X4 are connected in series to form a capacitor group, the piezoresistor T5 and the anti-detonator T7 form a first lightning protection circuit, the piezoresistor T3, the T4 and the anti-detonator T6 form a second lightning protection circuit, the capacitor group, the first lightning protection circuit, the second lightning protection circuit and the piezoresistor T8 are respectively arranged between the second ends of the insurance tubes F1 and F2, the 1 and 4 pins of the common-mode inductor L4 are respectively connected with the 2 and 3 pins of the common-mode inductor L2, the capacitors X1 and X2 are connected in series to form a capacitor group, and the 1 and 4 pins of the common-mode inductor L2 are respectively connected with the 1 and 2 pins of the connector J1.
Further, the rectifying circuit includes a chip D1, a first lead of 4 pins of the chip D1 is connected to a 1 pin of the connector J1, a second lead is connected to an anode of the diode D10, a cathode of the diode D10 is connected to a cathode of the diode D11, an anode of the diode D11 is connected to a 2 pin of the connector J1, a 2 pin of the chip D1 is connected to a 3 pin of the relay VR1, a 4 pin of the relay VR1 is connected to a 2 pin of the connector J1, a thermistor TT2 and a are connected in series and then are arranged between the 3 pin and the 4 pin of the relay VR1, a 1 pin of the relay VR1 is connected to 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 relay VR1, the 3 pin of the chip D1 is grounded, and the first lead of the 1 pin is connected to the power supply ADC1, and the second lead is grounded via the capacitor C2 and C1.
Further, the PFC driving circuit comprises an inductor L1, a MOS tube Q1, a controllable silicon TR1 and chips U1 and U2, wherein a first end of the inductor L1 is connected with the power ADC1, a first lead wire of a second end of the inductor L1 is connected with an anode of a diode D2, a second lead wire is connected with a drain electrode of the MOS tube Q1, a cathode of the diode D2 is connected with a 1 pin of a piezoresistor TT1, a 2 pin of the piezoresistor TT1 is connected with a 720V power supply, 1 and 8 pins of the chip U1 are connected with an 18V power supply, filter capacitors C7, C8, C9 and C10 are respectively arranged between the 18V power supply and the ground, 7 and 8 pins of the chip U1 are connected with a first end of a resistor R14, a first lead wire of a second end of the resistor R14 is connected with a first end of a resistor R15, a second lead wire is connected with a base electrode of a triode Q3 through a resistor R24, a first end of a collector of a capacitor Y1B of the triode Q3 is connected with a first end of the resistor R15, the second end of the resistor R15 is connected with the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is connected with the first end of the capacitor Y1B, the second end of the capacitor Y1B is grounded, a diode D13 and a resistor R22 are respectively arranged between the gate of the MOS transistor Q1 and the first end of the capacitor Y1B, the 2 pin of the chip U1 is connected with the first end of the resistor R31 through a resistor R21 and a diode D12 which are connected in parallel, the second end of the resistor R31 is connected with the 8 pin of the chip U2, the 5 pin of the chip U2 is connected with the cathode of the diode D10 through a resistor R47, a resistor R42, a resistor R34 and a resistor R19, the 4 pin of the chip U2 is connected with a 720V power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group, the first resistor group comprises resistors R58 and R58A which are connected in parallel, the second resistor group comprises resistors R48 and R51 which are connected in parallel, the third resistor group comprises resistors R44 and R45 which comprise resistors R36 which are connected in series, R32, R28, R20, R11 and R5, the 1 pin of silicon controlled rectifier TR1 connects 720V power, the first lead wire of 3 pins of silicon controlled rectifier TR1 connects the first end of electric capacity Y1B through electric capacity C14, the second lead wire connects 720V power through resistance R10, electric capacity C4 and C5, the model of chip U1 is TC4420, the model of chip U2 is ICE3PCS03G.
Further, the auxiliary power supply circuit comprises a transformer T2, a chip U9 and a MOS tube Q10, wherein 1 and 3 pins of the transformer T2 are connected with 720V input power supply, 4 and 5 pins of the transformer T2 output power supply 25VB and 18VDC,6 and 7 pins of the transformer T2 output power supply 5VV9,8 and 11 pins of the transformer T2 output power supply 12V1, 12 and 14 pins of the transformer U9 output power supply 12V2, 3 pins of the chip U9 are 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 electrode of a triode Q11 through a resistor R100, a first lead of an anode of the diode D27 is connected with an emitter of the triode Q11, a first lead of the second end of the resistor R94 is connected with a collector of the triode Q11 through a diode D28 and a resistor R99 which are connected in parallel, a second lead is connected with a grid of the MOS tube Q10, a drain electrode of the MOS tube Q10 is connected with a drain electrode of the resistor R9, a first lead of the chip T2 is connected with the resistor U9 through the resistor R10 and a second lead of the resistor R10 which is connected with the resistor R10, a first lead of the resistor R9 is connected with the resistor R14 through the resistor R14 and the resistor R14 which is connected with the resistor R14 in parallel, and the first lead of the resistor C4 is connected with the resistor C10 through the resistor R14.
Further, 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 ends and receive PWM signals sent by the main driving circuit, pins 15 and 10 of the chip U12 are output ends, pin 15 of the chip U12 is connected with a first end of a resistor R131, a first lead of a second end of the resistor R131 is connected with a cathode of a diode D32, a second lead is connected with a base electrode of a triode Q14 through a resistor R138, an emitter of the triode Q14 and an anode of the diode D32 are respectively connected with a grid electrode of the MOS transistor Q13, a resistor R136 is connected in parallel with two ends of the diode D32, a source electrode of the MOS transistor Q13 is connected with a pin 1 of an inductor L5, a drain electrode is connected with a 720V power supply, a diode D16 and a resistor R137 are respectively arranged between the grid electrode and the source electrode of the MOS transistor Q13, pin 10 of the chip U12 is connected with a first end of a resistor R154, the first lead of the second end of the resistor R154 is connected with the cathode of the diode D40, the second lead is connected with the base electrode of the triode Q16 through the resistor R162, the emitter of the triode Q16 and the anode of the diode D40 are respectively connected with the grid electrode of the MOS tube Q15, the resistor R152 is connected with two ends of the diode D32 in parallel, the drain electrode of the MOS tube Q15 is connected with the 1 pin of the inductor L5, the source electrode is grounded, the diode D43 and the resistor R155 are respectively arranged between the grid electrode and the source electrode of the MOS tube Q15, the 2 pin of the inductor L5 is connected with the 1 pin of the transformer TR1 through the inductor L7, the 8 pin of the transformer TR1 is connected with the 4 pin of the 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 1 pin of the inductor L6 is grounded through the resistors R143 and R147 connected with the 3 pins of the output terminal 1A, the first lead of the 2 pin of the inductor L6 is grounded through the capacitor Y1, the second lead is connected with the output terminal 1B, and the model of the chip U12 is SI8233.
Further, the main driving circuit includes a chip U15, an 11 pin of the chip U15 is connected to a 2 pin of the chip U12 through a resistor R159, a 15 pin of the chip U15 is connected to a 1 pin of the chip U12 through a resistor R151, a 16 pin of the chip U15 is connected to a 14 pin of the chip U15 through parallel capacitors C101 and C103, a 14 pin of the chip U15 is connected to a collector of a triode Q17, an emitter of the triode Q17 is connected to the 1 pin of the chip U12 through a resistor R153, a base of the triode Q17 is connected to an anode of a diode D44 through a resistor R161, a cathode of the diode D44 is connected to an anode of a diode D41, a first lead of the cathode of the diode D41 is connected to a cathode of a diode D37, a first lead of the anode of the diode D37 is connected to a ground through a diode D38, a second lead is connected to a 4 pin of the inductor L5, a first lead of the anode of the diode D34 is connected to a ground through a diode D35, and a second lead of the diode D3 is connected to a capacitor L5 is connected to a ground through a capacitor L3 and a capacitor L3 is arranged between the inductor L4 and the chip L3 and the pin 655.
Further, the isolation current detection circuit includes an inductor L8, a 1 pin of the inductor L8 is connected to a 3 pin of the transformer TR1, a 2 pin is connected to the ground through a capacitor C98 and a capacitor C100 connected in parallel, a resistor R163 is disposed between the 3 pin and the 4 pin of the inductor L8, a first lead of the 3 pin of the inductor L8 is connected to the ground through a diode D46, a second lead is connected to a first end of a resistor R175 through a diode D48, a second lead of the resistor R175 is connected to a 6 pin of the chip U15, a first lead of the 3 pin of the inductor L8 is connected to the ground through a diode D47, a second lead is connected to the first end of the resistor R175 through a diode D49, a third lead is connected to the first end of a capacitor C112 through a resistor R171, a first lead of the second end of the capacitor C112 is connected to the first end of a resistor R179 through a diode D52 and a resistor R192, a second lead is connected to the first end of the resistor R179 through a diode D54 and a resistor R192, and a second lead is connected to the first end of the resistor R179, and the second lead of the chip U15 is connected to the 6 pin of the resistor R179.
Further, the voltage loop control circuit includes a chip U16A, U AB and U16B, the 7 pin of the chip U16A is connected with the input end of the optical coupler U20 through a resistor R196 and a diode D59, the output end of the optical coupler U20 is connected with the first end of a resistor R210, the second end of the resistor R210 is respectively connected with the 4 pin and the 5 pin of the chip U15 through a resistor R185 and a resistor R186, the first lead of the 6 pin of the chip U16A is connected with the 1 pin of the inductor L6 through a resistor R187, the second lead is connected with the 1 pin of the chip U22AB through a resistor R183, a resistor R172 and a resistor R169, the capacitor C126 and the resistor R202 are connected in series and then are arranged between the 6 pin and the 7 pin of the chip U16A, the 5 pin of the chip U22AB is connected with the 1 pin of the chip U16B, the 2 pin of the chip U16B is connected with the ground through a capacitor C108 and a resistor R167 which are connected in parallel, the resistor R166 is arranged between the 1 pin and 2 pin of the chip U16B, the PWM signal of the chip U16B is connected with the PWM signal input 1, the current loop control circuit comprises a chip U17A, U AA and a chip U17B, wherein a 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, a first lead of a 2 pin of the chip U17B is connected with the load end through resistors R226, R228 and R227, a 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 are arranged between the 1 pin and the 2 pin of the chip U17B, a 3 pin of the chip U22AA is connected with the 7 pin of the chip U17A, a 6 pin of the chip U17A is connected with the ground through a capacitor C131 and a resistor R208 which are connected in parallel, a 5 pin of the chip U17A is connected with the output terminal 1A through a resistor R193, a diode D55 and a diode D57 are arranged between the 7 pin and the 5 pin of the chip U17A after being connected in series, the chips 35A 16A, U16A and U17X 17B are of the size 393, the model numbers of the chips U22AA and U22AB are LM358.
Further, the overvoltage protection circuit comprises a chip U23A, U B and a triode Q5A, wherein a 2 pin of the chip U23B is connected with the output terminal 1B through resistors R17 and R8, a 1 pin is connected with a 5 pin of the chip U23A, a resistor R13 and a capacitor C17 are connected in series and then are arranged between the 1 pin and the 2 pin of the chip U23B, a 7 pin of the chip U23A is connected with a base electrode of the triode Q5A through a resistor R16, an emitter of the triode Q5A is grounded, a collector is connected with a 7 pin of the chip U15, the chips U23A and U23B are TSX393, the overcurrent protection circuit comprises a chip U19A and U19B, a 1 pin of the chip U19A is connected with a 1 pin of the inductor L6 through a resistor R201, an 8 pin is connected with the ground through a resistor R205, a 3 pin of the chip U19A is connected with a 4 pin of the chip U19B through a resistor R203, a collector is connected with a 7 pin of the chip U15 through a resistor R206 and a diode U21B, and the type of the chip U19A is connected with an output terminal of the chip U19B is connected with the output terminal U19A through a resistor R21B, and the type of the chip U19B is connected with the output terminal U21B, and the type 4U 19B is connected with the output terminal of the chip U21B is connected with the chip U19B.
Compared with the prior art, the invention has the beneficial effects that:
1. the 480V voltage in the industrial area can also be illuminated by adopting LEDs through isolation driving, so that energy sources are saved;
2. The EMC circuit can filter interference signals and protect the power supply from lightning;
3. the output of the power supply 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 bead 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 an EMC circuit of the present invention;
FIG. 2 is a schematic diagram of the rectifying circuit of the present invention;
FIG. 3 is a schematic diagram of the principle structure of the PFC driving circuit according to the present invention;
FIG. 4 is a schematic diagram of the auxiliary power circuit of the present invention;
FIG. 5 is a schematic diagram of the principle structure of the isolation driving circuit of the present invention;
FIG. 6 is a schematic diagram of the principle structure of the main driving circuit of the present invention;
FIG. 7 is a schematic diagram of the principle structure of the isolated current detection circuit of the present invention;
FIG. 8 is a schematic diagram of the principle and structure of the control circuit of the voltage loop and the current loop of the present invention;
FIG. 9 is a schematic diagram of the principle structure of the overvoltage protection circuit of the present invention;
fig. 10 is a schematic diagram of the principle structure of the overcurrent protection circuit of the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. The preferred embodiments of the present invention are illustrated in the drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification. 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, a driving power supply for an LED lamp is provided, including: EMC circuit, filter electromagnetic interference, protect the power; the rectification circuit converts the input alternating voltage into direct voltage and outputs 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 720V power supply into 12V and 18V power supply for the subsequent circuit; the isolation driving circuit outputs a driving power supply to drive 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 for detecting an output current; the voltage ring control circuit stabilizes output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stabilizing output current and is connected with the isolation driving circuit; and the protection circuit is respectively connected with the isolation driving circuit and the main driving circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit.
In embodiment 2, as shown in fig. 1, the EMC circuit includes a power interface DA1, pins 1 and 2 of the power interface DA1 are respectively connected to first ends of fuses F1 and F2, second ends of the fuses F1 and F2 are respectively connected to pins 2 and 3 of a common-mode inductor L4, capacitors X3 and 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, T4 and an anti-detonator T6 form a second lightning protection circuit, the capacitor group, the first lightning protection circuit, the second lightning protection circuit and the piezoresistor T8 are respectively arranged between second ends of the fuses F1 and F2, pins 1 and 4 of the common-mode inductor L4 are respectively connected to pins 2 and 3 of the common-mode inductor L2, the capacitors X1 and X2 are connected in series to form a capacitor group, and pins 1 and 4 of the common-mode inductor L2 are respectively connected to pins 1 and 2 of the connector J1.
In this embodiment, the 480VAC voltage port is input to the power source interface DA1, insurance tube F1 and F2 can prevent the overcurrent, piezo-resistor T8 can prevent surge voltage, the series connection of X3 electric capacity and X4 electric capacity is the EMI effect, can filter the various interference signals that come by the electric wire netting, first lightning protection circuit is lightning protection 10KV thunderbolt, protect electric power supply not damaged, in the second lightning protection circuit, piezo-resistor T4, T3 and lightning protection tube T6 constitute T type circuit, can prevent 6KV thunderbolt, through first lightning protection circuit and second lightning protection circuit, double-deck protection power supply is not struck by lightning, common mode inductance L4, L2 and electric capacity X1, X2 constitute the bi-pass EMC circuit, prevent equipment from producing electromagnetic interference.
In embodiment 3, as shown in fig. 2, the rectifying circuit includes a chip D1, a first lead of 4 pins of the chip D1 is connected to pin 1 of the connector J1, a second lead is connected to an anode of a diode D10, a cathode of the diode D10 is connected to a cathode of a diode D11, an anode of the diode D11 is connected to pin 2 of the connector J1, pin 2 of the chip D1 is connected to pin 3 of the relay VR1, pin 4 of the relay VR1 is connected to pin 2 of the connector J1, thermistors TT2 and TT2A are connected in series and then are arranged between pin 3 and pin 4 of the relay VR1, pin 1 of the relay VR1 is connected to a 12V power supply, pin 2 is connected to ground, diode D8 and capacitor C15 are respectively arranged between pin 1 and pin 2 of the relay VR1, pin 3 of the chip D1 is connected to ground, and pin 1 first lead is connected to power supply ADC1, and second lead is connected to ground via capacitor C2 and C1.
In this embodiment, the chip D1 is a rectifier bridge with a model D25SB100, and 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, so as to protect components 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 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 1 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, 7 and 8 pins of the chip U1 are connected to a first end of a resistor R14, a first lead of a second end of the resistor R14 is connected to a first end of a resistor R15 via a diode D9, a second lead is connected to a base of a transistor Q3 via a resistor R24, a collector of the transistor Q3 is connected to a first end of a capacitor Y1B and an emitter of the resistor R15 is connected to a first end of the resistor R15, the second end of the resistor R15 is connected with the grid electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is connected with the first end of the capacitor Y1B, the second end of the capacitor Y1B is grounded, a diode D13 and a resistor R22 are respectively arranged between the grid electrode of the MOS tube Q1 and the first end of the capacitor Y1B, the 2 pin of the chip U1 is connected with the first end of the resistor R31 through a resistor R21 and a diode D12 which are connected in parallel, the second end of the resistor R31 is connected with the 8 pin of the chip U2, the 5 pin of the chip U2 is connected with the cathode electrode of the diode D10 through a resistor R47, a resistor R42, a resistor R34 and a resistor R19, the 4 pin of the chip U2 is connected with a 720V power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group, the first resistor group comprises resistors R58 and R58A which are connected in parallel, the second resistor group comprises resistors R48 and R51 which are connected in parallel, the third resistor group comprises resistors R44 and R45 which are connected in parallel, the fourth resistor group comprises resistors R36, R32, R28, R20, R11 and R5 which are connected in series, wherein the 1 pin of the controlled silicon TR1 is connected with a 720V power supply, the first lead of the 3 pin of the controlled silicon TR1 is connected with the first end of the capacitor Y1B through the capacitor C14, the second lead 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 ICE3PCS03G.
In this embodiment, the inductor L3, the chip U2 and U1, the MOS transistor Q1, and the diode D2 form a boost circuit, a constant voltage 720VDC may be output, the output end of the chip U1 drives the MOS transistor Q1, the power end of the chip U1 is provided with filter capacitors C9, C10, C8 and C5, which may prevent interference, the 5 pin of the chip U2 is connected to the cathode of the diode D10 through resistors R47, R42, R34 and R19, the input voltage may be detected through the diodes D10, D11 and R19, the 4 pin of the chip U2 is connected to the 720V power supply through the first resistor group, the second resistor group, the third resistor group and the fourth resistor group, which may detect the output voltage, the 8 pin of the chip U2 is connected to the input end of the chip U1, the chip U2 is controlled by comparing the detected voltage, the output of the chip U1 is controlled, the output voltage is ensured to be constant, the resistors R14, R24, R15, R22, the diode D6, D13 and the triode Q3 form a first PFC driving buffer circuit, the first PFC peak voltage may be prevented from being damaged by the first PFC driving circuit, the second PFC peak voltage may be prevented from being damaged by the second PFC driving circuit, and the second PFC driving circuit is prevented from being damaged by the voltage 4, and the surge current is prevented from being damaged by the driving the voltage 1C 1.
In embodiment 5, as shown in fig. 4, the auxiliary power circuit includes a transformer T2, a chip U9 and a MOS transistor Q10, wherein the 1 and 3 pins of the transformer T2 are connected to 720V input power, the 4 and 5 pin output power 25VB and the power 18vdc of the transformer T2, the 6 and 7 pin output power 5VV9,8 and the 11 pin output power 12V1, 12 and 14 pin output power 12V2 of the transformer T2, the 3 pin of the chip U9 is connected to the first end of a resistor R101, the first lead of the second end of the resistor R101 is connected to the cathode of a diode D27, the second lead is connected to the base of a transistor Q11 through a resistor R100, the first lead of the anode of the diode D27 is connected to the emitter of the transistor Q11, the first lead of the second end of the resistor R94 is connected to the gate of the transistor Q11 through a parallel diode D28 and a resistor R99, the second lead is connected to the gate of the MOS transistor Q10, the drain of the transistor Q10 is connected to the first end of the drain of the resistor U9, the drain of the transistor Q10 is connected to the drain of the capacitor U2 is connected to the drain of the resistor U9 and the drain of the resistor R10 through a resistor R9, the first lead of the drain of the resistor C9 is connected to the drain of the resistor Q10 is connected to the drain of the resistor Q14, and the first lead of the resistor Q14 is connected to the first lead of the resistor Q11, and the first lead of the resistor is connected to the first lead of the resistor Q4 is connected to the first end of the resistor Q11, and the first lead is connected to the first resistor is connected to the first end of the resistor is connected to the first resistor of resistor 12.
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, and the capacitors C74, C74A form a voltage detection circuit, the 4 pin of the chip U9, the resistors R120, R190, R110 form a current detection circuit, the 3 pin output PWM switching signal of the chip U9 transmits the signal to the gate of the MOS transistor Q10 through the resistors R101, R94, R10, the transistor Q11, and 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 stably supplied, and the resistors R101, R94, R10, the transistor Q11, the diodes D17, D23 form a peak protection network for protecting the MOS transistor Q10.
In embodiment 6, as shown in fig. 5, the isolation driving circuit includes a chip U12, MOS transistors Q13 and Q15, and a transformer TR1, pins 1 and 2 of the chip U12 are input terminals, receive PWM signals 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 a first end of a resistor R131, a first lead of a second end 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 through a resistor R138, an emitter of the transistor Q14 and an anode of the diode D32 are respectively connected to a gate of the transistor Q13, a resistor R136 is connected in parallel to two ends of the diode D32, a source of the transistor Q13 is connected to pin 1 of an inductor L5, a drain is connected to a 720V power supply, a diode D16 and a resistor R137 are respectively disposed between the gate and the source of the transistor Q13, pin 10 of the chip U12 is connected to a first end of the resistor R154, the first lead of the second end of the resistor R154 is connected with the cathode of the diode D40, the second lead is connected with the base electrode of the triode Q16 through the resistor R162, the emitter of the triode Q16 and the anode of the diode D40 are respectively connected with the grid electrode of the MOS tube Q15, the resistor R152 is connected with two ends of the diode D32 in parallel, the drain electrode of the MOS tube Q15 is connected with the 1 pin of the inductor L5, the source electrode is grounded, the diode D43 and the resistor R155 are respectively arranged between the grid electrode and the source electrode of the MOS tube Q15, the 2 pin of the inductor L5 is connected with the 1 pin of the transformer TR1 through the inductor L7, the 8 pin of the transformer TR1 is connected with the 4 pin of the 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 1 pin of the inductor L6 is grounded through the resistors R143 and R147 connected with the 3 pins of the output terminal 1A, the first lead of the 2 pin of the inductor L6 is grounded through the capacitor Y1, the second lead is connected with the output terminal 1B, and the model of the chip U12 is SI8233.
In this embodiment, pins 1 and 2 of the chip U12 are input terminals, receive PWM signals sent by the main driving circuit, pins 15 and 10 of the chip U12 are output terminals, output signals to the G poles of the MOS transistors Q13 and Q15, so that the MOS transistor switches work, thereby controlling voltage output, resistors R136, R137, R138, diode D36 and triode Q14 form a first isolation driving limiting voltage peak circuit, protecting the MOS transistor Q13 from peak voltage loss, resistors R152, R155, R162, diode D42 and triode Q15 form a second isolation driving limiting voltage peak circuit, protecting the MOS transistor Q15 from peak voltage loss, and output terminals 1A and 1B are connected to the LED lighting device.
In embodiment 7, as shown in fig. 5-6, the main driving circuit includes a chip U15, the 11 pin of the chip U15 is connected to the 2 pin of the chip U12 through a resistor R159, the 15 pin of the chip U15 is connected to the 1 pin of the chip U12 through a resistor R151, the 16 pin of the chip U15 is connected to the 14 pin of the chip U15 through parallel capacitors C101 and C103, the 14 pin of the chip U15 is connected to the collector of a triode Q17, the emitter of the triode Q17 is connected to the 1 pin of the chip U12 through a resistor R153, the base of the triode Q17 is connected to the anode of a diode D44 through a resistor R161, the cathode of the diode D44 is connected to the anode of a diode D41, the first lead of the cathode of the diode D41 is connected to the cathode of a diode D37, the first lead of the anode of the diode D37 is connected to the ground through a diode D38, the second lead of the inductor L5 is connected to the collector of the triode Q17, the base of the diode Q17 is connected to the anode of the diode D4, and the second lead of the diode D35 is connected to the inductor L5 is connected to the ground through a capacitor L3 of the diode L35, and the model number of the inductor L is 655 is set between the two pins.
In this embodiment, the PWM signals output by pins 11 and 15 of the chip U15 are respectively transmitted to pins 1 and 2 of the chip U12 through resistors R151 and R159, so as to drive the chip U12, and the isolated current detection inductor L5, diodes D34, D35, D37, D38, D41, D44, resistors R161, R153, and triode Q17 form a current detection network, and the duty ratio of the signals can be adjusted through the current detection network, so that the output PWM is more reasonable and the performance is more stable.
In embodiment 8, as shown in fig. 5-7, the isolation current detection circuit includes an inductor L8, the 1 pin of the inductor L8 is connected to the 3 pin of the transformer TR1, the 2 pin is connected to the ground through the capacitors C98 and C100 connected in parallel, a resistor R163 is disposed between the 3 and 4 pins of the inductor L8, the first pin of the 3 pin of the inductor L8 is connected to the ground through the diode D46, the second pin is connected to the first end of the resistor R175 through the diode D48, the second pin of the resistor R175 is connected to the 6 pin of the chip U15, the first pin of the 3 pin of the inductor L8 is connected to the first end of the resistor R175 through the diode D47, the second pin is connected to the first end of the resistor R175 through the diode D49, the third pin is connected to the first end of the resistor R112 through the diode D52 and the resistor R182, the second pin is connected to the first end of the resistor R179 through the diode D54 and the resistor R192, and the second pin of the resistor R179 is connected to the first end of the resistor R15.
In this embodiment, the detection inductor L8 and the diode, resistor and capacitor connected with the detection inductor L8 form an isolation current detection circuit, and the 6 pin of the chip U15 detects the output current through the isolation current detection circuit, and in this embodiment, the chip U15 can be protected to work in a safe area by adopting the isolation current transformer L8.
In embodiment 9, as shown in fig. 8, the voltage loop control circuit includes a chip U16A, U AB and a chip U16B, wherein pin 7 of the chip U16A is connected to the input end of the optocoupler U20 via a resistor R196 and a diode D59, the output end of the optocoupler U20 is connected to the first end of a resistor R210, the second end of the resistor R210 is connected to pins 4 and 5 of the chip U15 via resistors R185 and R186, the first lead of pin 6 of the chip U16A is connected to pin 1 of the inductor L6 via a resistor R187, the second lead is connected to pin 1 of the chip U22AB via resistors R183, R172 and R169, the capacitor C126 is connected to pin 1 of the chip U16B via a capacitor C108 and a resistor R167, pin 5 of the chip U22AB is connected to pin 1 of the chip U16B, pin 2 of the chip U16B is connected to the ground via a capacitor C108 and a resistor R167 in parallel, the resistor R166 is arranged between pin 1 of the chip U16B and pin 2, the PWM signal is input to pin 3 of the chip U16B, the current loop control circuit comprises a chip U17A, U AA and a chip U17B, wherein a 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, a first lead of a 2 pin of the chip U17B is connected with the load end through resistors R226, R228 and R227, a 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, a 3 pin of the chip U22AA is connected with the 7 pin of the chip U17A, a 6 pin of the chip U17A is connected with the ground through a capacitor C131 and a resistor R208 which are connected in parallel, a 5 pin of the chip U17A is connected with an input signal PWM2 through a resistor R193, diodes D55 and D57 are connected in series and then arranged between the 7 pin and 5 pin of the chip U17A, the chips U16A, U16A and U17B are of the size of 393 is the size of the chip U17A and the chip 17B is 393, the model numbers of the chips U22AA and U22AB are LM358.
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, so that the frequency response can be increased, and the chip U16A and the capacitor C126X form a voltage control loop, so that the output voltage can be stabilized; the chip U17A and the resistor R204 form an integrating circuit, the function of increasing frequency compensation is achieved, the chip U22AA is a voltage follower, the frequency response can be increased, the chip U17B, the capacitor C137, the capacitor C135 and the resistor R219 form a current control loop, and the current output changes linearly.
In embodiment 10, as shown in fig. 9-10, the overvoltage protection circuit includes a chip U23A, U B and a triode Q5A, the 2 pin of the chip U23B is connected to the output terminal 1B through resistors R17 and R8, the 1 pin of the chip U19A is connected to the 5 pin of the chip U23A, the resistor R13 and the capacitor C17 are connected in series and then are arranged between the 1 pin and the 2 pin of the chip U23B, the 7 pin of the chip U23A is connected to the base of the triode Q5A through a resistor R16, the emitter of the triode Q5A is grounded, the collector is connected to the 7 pin of the chip U15, the models of the chips U23A and U23B are TSX393, the overcurrent 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 R201, the 8 is connected to the ground through a resistor R205, the 3 pin of the chip U19A is connected to the 4 pin of the chip U19B through a resistor R203, the collector is connected to the 7 pin of the chip U15, the models of the chip U23A and the output terminal of the chip U19B is connected to the output terminal of the chip U19B through a resistor R21 and the diode U19B is connected to the model of the output terminal of the chip U19B 12B.
In this embodiment, when the output voltage is too high, the signal of the output voltage is transmitted to the 2 pin of the chip U23B through the resistor R17, the 2 pin of the chip U23B outputs a high potential after being compared with the 3 pin potential, and a high level is output through a voltage follower formed by the chip U23A to drive the base electrode of the triode Q15A, so that the Q15A triode is conducted, the potential of the 7 pin of the chip U15 is pulled down, and when the potential of the 7 pin of the chip U15 is less than 0.7V, the U15 stops working, so that the high voltage is not output, the LED lighting lamp can be prevented from being damaged by the output of the high voltage, and the service life of the power supply is also protected; in the overcurrent protection circuit, the chip U19A, U B and the diode D60 form an output current detection network, detected information is transmitted to the optical coupler U21, and when the output current is too high, the optical coupler U21 outputs to enable the working voltage of the chip U15 to be lowered, so that the output current does not exceed the current range driven by the LEDs.
The working principle of the invention is as follows:
the EMC circuit is connected with 480VAC industrial power supply, the rectifier circuit converts the input alternating voltage into direct current voltage and outputs the direct current voltage to the PFC driving circuit, in the PFC driving circuit, the output end of the chip U1 drives the MOS tube Q1 to output constant 720V voltage, the auxiliary power supply circuit can convert the 720V power supply into 12V and 18V power supply for subsequent circuits, the isolation driving circuit is controlled by the main driving circuit, the output driving power supply drives the LED lamp load, the voltage loop control circuit and the current loop control circuit enable the power supply to output stably, the overvoltage protection circuit and the overcurrent protection circuit can prevent the LED lamp bead from being damaged due to overhigh output, and the service life of the power supply is prolonged.
The above-described features are continuously combined with each other to form various embodiments not listed above, and are regarded as the scope of the present invention described in the specification; and, it will be apparent to those skilled in the art from this disclosure that modifications and variations can be made without departing from the scope of the invention defined in the appended claims.

Claims (9)

1. A driving power supply for an LED lamp, comprising: EMC circuit, filter electromagnetic interference, protect the power; the rectification circuit converts the input alternating voltage into direct voltage and outputs 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 720V power supply into 12V and 18V power supply for the subsequent circuit; the isolation driving circuit outputs a driving power supply to drive 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 for detecting an output current; the voltage ring control circuit stabilizes output voltage and is connected with the isolation driving circuit; the current loop control circuit is used for stabilizing output current and is connected with the isolation driving circuit; the protection circuit is respectively connected with the isolation driving circuit and the main driving circuit and comprises an overvoltage protection circuit and an overcurrent protection circuit;
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 ends and are used for receiving PWM signals sent by the main driving circuit, pins 15 and 10 of the chip U12 are output ends, pin 15 of the chip U12 is connected with a first end of a resistor R131, a first lead of a second end of the resistor R131 is connected with a cathode of a diode D32, a second lead is connected with a base electrode of a triode Q14 through a resistor R138, an emitter of the triode Q14 and an anode of the diode D32 are respectively connected with a grid electrode of the MOS transistor Q13, a resistor R136 is connected with two ends of the diode D32 in parallel, a source electrode of the MOS transistor Q13 is connected with a pin 1 of an inductor L5, a drain electrode is connected with a 720V power supply, a diode D16 and a resistor R137 are respectively arranged between the grid electrode and the source electrode of the MOS transistor Q13, pin 10 of the chip U12 is connected with a first end of a resistor R154, a first lead of the second end of the resistor R154 is connected with a cathode of the diode D40, the second lead is connected with the base electrode of the triode Q16 through a resistor R162, the emitter electrode of the triode Q16 and the anode electrode of the diode D40 are respectively connected with the grid electrode of the MOS tube Q15, a resistor R152 is connected in parallel with two ends of the diode D32, the drain electrode of the MOS tube Q15 is connected with the 1 pin of the inductor L5, the source electrode is grounded, a diode D43 and a resistor R155 are respectively arranged between the grid electrode and the source electrode of the MOS tube Q15, the 2 pin of the inductor L5 is connected with the 1 pin of the transformer TR1 through an inductor L7, the 8 pin of the transformer TR1 is connected with the 4 pin of the 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 1 pin of the inductor L6 is grounded through resistors R143 and R147 which are connected in parallel, the 3 pin is grounded through a capacitor Y1C, the 2 pin of the inductor L6 is connected with the output terminal 1B through a second lead, the model of the chip U12 is SI8233.
2. The driving power supply of an LED lamp according to claim 1, wherein the EMC circuit includes a power interface DA1, pins 1 and 2 of the power interface DA1 are respectively connected to first ends of fuses F1 and F2, second ends of the fuses F1 and F2 are respectively connected to pins 2 and 3 of a common-mode inductor L4, capacitors X3 and X4 are serially connected to form a capacitor group, a piezoresistor T5 and a detonator T7 form a first lightning protection circuit, piezoresistors T3, T4 and a detonator T6 form a second lightning protection circuit, the capacitor group, the first lightning protection circuit, the second lightning protection circuit and a piezoresistor T8 are respectively arranged between second ends of the fuses F1 and F2, pins 1 and 4 of the common-mode inductor L4 are respectively connected to pins 2 and 3 of the common-mode inductor L2, the capacitors X1 and X2 are serially connected to be arranged between pins 1 and 4 of the common-mode inductor L4, and pins 1 and 4 of the common-mode inductor L2 are respectively connected to pins 1 and 2 of the connector L1 and 2.
3. The driving power supply of an LED lamp according to claim 2, wherein the rectifying circuit comprises a chip D1, a first lead of 4 pins of the chip D1 is connected to a1 pin of the connector J1, a second lead is connected to an anode of a diode D10, a cathode of the diode D10 is connected to a cathode of a diode D11, an anode of the diode D11 is connected to a 2 pin of the connector J1, a 2 pin of the chip D1 is connected to a 3 pin of the relay VR1, a 4 pin of the relay VR1 is connected to a 2 pin of the connector J1, thermistors TT2 and TT2A are connected in series and then are arranged between the 3 and 4 pins of the relay VR1, a1 pin of the relay VR1 is connected to a 12V power supply, a 2 pin is connected to ground, a diode D8 and a capacitor C15 are respectively arranged between the 1 and 2 pins of the relay VR1, a 3 pin of the chip D1 is connected to ground, and a first lead of the 1 pin is connected to an ADC1, and a second lead is connected to a capacitor C1 via the capacitor C2 and C1.
4. The driving power supply of an LED lamp according to claim 3, wherein the PFC driving circuit comprises an inductor L1, a MOS tube Q1, a silicon controlled rectifier TR1 and chips U1 and U2, wherein a first pin of a second end of the inductor L1 is connected with an anode of a diode D2, a second pin is connected with a drain electrode of the MOS tube Q1, a cathode of the diode D2 is connected with a pin 1 of a piezoresistor TT1, a pin 2 of the piezoresistor TT1 is connected with a 720V power supply, pins 1 and 8 of the chip U1 are connected with an 18V power supply, filter capacitors C7, C8, C9 and C10 are respectively arranged between the 18V power supply and the ground, pins 7 and 8 of the chip U1 are connected with a first end of a resistor R14, a first pin of a second end of the resistor R14 is connected with a first end of a resistor R15 through a diode D9, a second pin is connected with a base electrode of a resistor Q3 through a resistor R24, a collector electrode of a triode Q3 is connected with a first end of a collector electrode of a capacitor Y1, the emitter is connected with the first end of the resistor R15, the second end of the resistor R15 is connected with the grid electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is connected with the first end of the capacitor Y1B, the second end of the capacitor Y1B is grounded, a diode D13 and a resistor R22 are respectively arranged between the grid electrode of the MOS tube Q1 and the first end of the capacitor Y1B, the 2 pin of the chip U1 is connected with the first end of the resistor R31 through a parallel resistor R21 and a diode D12, the second end of the resistor R31 is connected with the 8 pin of the chip U2, the 5 pin of the chip U2 is connected with the cathode of the diode D10 through resistors R47, R42, R34 and R19, the 4 pin of the chip U2 is connected with a 720V power supply through a first resistor group, a second resistor group, a third resistor group and a fourth resistor group, the first resistor group comprises resistors R58 and R58A which are connected in parallel, the second resistor group comprises resistors R48 and R51 which are connected in parallel, the third resistor group comprises resistors R44 and R45 which are connected in parallel, the fourth resistor group comprises resistors R36, R32, R28, R20, R11 and R5 which are connected in series, the 1 pin of the silicon controlled rectifier TR1 is connected with 720V power supply, the first lead of the 3 pin of the silicon controlled rectifier TR1 is connected with the first end of the capacitor Y1B through a capacitor C14, the second lead is connected with 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 ICE3PCS03G.
5. The driving power supply of the LED lamp according to claim 4, wherein the auxiliary power supply circuit comprises a transformer T2, a chip U9 and a MOS transistor Q10, wherein the 1 and 3 pins of the transformer T2 are connected to 720V input power, the 4 and 5 pin output power 25VB and the 18vdc, the 6 and 7 pin output power 5VV9,8 and 11 pin output power 12V1, 12 and 14 pin output power 12V2 of the transformer T2, the 3 pin of the chip U9 is connected to the first end of a resistor R101, the first lead of the second end of the resistor R101 is connected to the cathode of a diode D27, the second lead is connected to the base of a transistor Q11 via a resistor R100, the first lead of the anode of the diode D27 is connected to the first end of a resistor R94, the first lead of the second end of the resistor R94 is connected to the 12V1 via a diode D28 and a resistor R99 which are connected in parallel, the second lead is connected to the gate of the transistor Q10, the first lead of the 3 pin of the chip U9 is connected to the first end of the resistor R101, the second lead is connected to the drain of the second lead of the resistor R10 is connected to the resistor R9 via the drain of the resistor R10, the first lead of the resistor R14 is connected to the drain of the resistor R9 and the resistor R10 via the resistor R14 is connected to the drain of the resistor R14, the first lead of the resistor Q11 is connected to the resistor Q14, the first lead of the resistor is connected to the resistor Q11, and the first lead of the resistor is connected to the resistor Q11.
6. The driving power supply of an LED lamp according to claim 5, wherein the main driving circuit comprises a chip U15, the 11 pin of the chip U15 is connected to the 2 pin of the chip U12 through a resistor R159, the 15 pin of the chip U15 is connected to the 1 pin of the chip U12 through a resistor R151, the 16 pin of the chip U15 is connected to the 14 pin of the chip U15 through parallel capacitors C101 and C103, the 14 pin of the chip U15 is connected to the collector of a triode Q17, the emitter of the triode Q17 is connected to the 1 pin of the chip U12 through a resistor R153, the base of the triode Q17 is connected to the anode of a diode D44 through a resistor R161, the cathode of the diode D44 is connected to the anode of a diode D41, the first lead of the cathode of the diode D41 is connected to the cathode of a diode D37, the first lead of the anode of the diode D37 is connected to the ground through a diode D38, the second lead is connected to the inductor L5, the second lead of the diode L4 is connected to the anode of the diode D34, and the second lead of the diode D3 is connected to the diode D35 is connected to the model 3 between the two pins L5 and L3 and L35.
7. The LED lamp driving power supply according to claim 6, wherein the isolation current detection circuit comprises an inductor L8, the 1 pin of the inductor L8 is connected to the 3 pin of the transformer TR1, the 2 pin is connected to the ground via the capacitors C98 and C100 connected in parallel, a resistor R163 is disposed between the 3 and 4 pins of the inductor L8, the first pin of the 3 pin of the inductor L8 is connected to the ground via a diode D46, the second pin is connected to the first end of a resistor R175 via a diode D48, the second pin of the resistor R175 is connected to the 6 pin of the chip U15, the first pin of the 3 pin of the inductor L8 is connected to the first end of the resistor R175 via a diode D47, the third pin is connected to the first end of a capacitor C112 via a diode D49, the first pin of the second end of the capacitor C112 is connected to the first end of a resistor R179 via a diode D52 and a resistor R182, and the second pin of the resistor R175 is connected to the first end of the resistor R179 via a diode D54 and the second pin of the resistor R179.
8. The driving power supply of an LED lamp according to claim 7, wherein the voltage loop control circuit comprises a chip U16A, U AB and a chip U16B, wherein pin 7 of the chip U16A is connected to the input end of the optocoupler U20 via a resistor R196 and a diode D59, the output end of the optocoupler U20 is connected to the first end of a resistor R210, the second end of the resistor R210 is connected to pins 4 and 5 of the chip U15 via resistors R185 and R186, respectively, the first lead of pin 6 of the chip U16A is connected to pin 1 of the inductor L6 via a resistor R187, the second lead is connected to pin 1 of the chip U22AB via resistors R183, R172 and R169, the capacitor C126 and the resistor R202 are connected in series and then are arranged between pins 6 and 7 of the chip U16A, pin 5 of the chip U22AB is connected to pin 1 of the chip U16B, pin 2 of the chip U16B is connected to ground via a capacitor C108 and a resistor R167 in parallel, the second lead of the chip U16A is arranged between pins 1 and 2B of the chip U16B, the 3 pins of the chip U16B are connected with an input signal PWM1, the current loop control circuit comprises a chip U17A, U AA and a chip 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 arranged between the 1 pin and the 2 pin of the chip U17B after being connected in series, 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 grounded through a capacitor C131 and a resistor R208 which are connected in parallel, the 5 pin of the chip U17A is connected with the output terminal 1A through a resistor R193, a capacitor C137 and a diode D55 and a diode D57 are arranged between the 7 pin and the 5 pin of the chip U17A after being connected in series, the chips U16A, U, 16B, U A and U17B are TSX393 in size and the chips U22AA and U22AB are LM358 in size.
9. The driving power supply of the LED lamp according to claim 8, wherein the overvoltage protection circuit comprises a chip U23A, U B and a triode Q5A, the 2 pin of the chip U23B is connected with the output terminal 1B through resistors R17 and R8, the 1 pin of the chip U19A is connected with the 5 pin of the chip U23A, the resistor R13 and the capacitor C17 are connected in series and then are arranged between the 1 pin and the 2 pin of the chip U23B, the 7 pin of the chip U23A is connected with the base of the triode Q5A through a resistor R16, the emitter of the triode Q5A is grounded, the collector is connected with the 7 pin of the chip U15, the models of the chips U23A and U23B are TSX393, the 1 pin of the chip U19A is connected with the 1 pin of the inductor L6 through a resistor R201, the 8 pin is connected with the ground through a resistor R205, the 3 pin of the chip U19A is connected with the base of the triode Q5A through a resistor R203, the models of the chips U19B and the 7 pin of the chip U23B are connected with the model of the chip U19A and the output terminal of the chip U19B is connected with the resistor U19B, the model of the chip U19B is connected with the output terminal of the chip U19B 4B, the chip U21B is connected with the output terminal of the chip U19B 3B is connected with the chip B3.
CN202110897961.7A 2021-08-05 2021-08-05 Driving power supply of LED lamp Active CN113543409B (en)

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