CN114364093A - PWM signal dimming circuit and method for three-phase alternating current power supply LED lamp - Google Patents
PWM signal dimming circuit and method for three-phase alternating current power supply LED lamp Download PDFInfo
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- CN114364093A CN114364093A CN202210274290.3A CN202210274290A CN114364093A CN 114364093 A CN114364093 A CN 114364093A CN 202210274290 A CN202210274290 A CN 202210274290A CN 114364093 A CN114364093 A CN 114364093A
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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
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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]
- H05B45/40—Details of LED load circuits
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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
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- 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]
Abstract
The invention discloses a PWM signal dimming circuit and a PWM signal dimming method for a three-phase alternating current power supply LED lamp, in particular to a PWM signal dimming method and a PWM signal dimming circuit for a three-phase 380V tunnel LED lamp driving chip, which comprise a dimming input signal processing circuit, an isolation optocoupler circuit, a driving chip output control circuit and the like.
Description
Technical Field
The invention belongs to the electronic field of tunnel lighting, and particularly relates to a PWM (pulse-width modulation) signal dimming circuit and method for a three-phase alternating-current power supply LED lamp, in particular to a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driving chip.
Background
The LED is applied more and more widely as a green and efficient new generation lighting source, the LED lighting technology has the characteristics of high lighting effect, good color rendering, long service life, energy conservation, environmental protection and the like, the traditional lighting technology is continuously replaced, in order to create a more comfortable lighting atmosphere and save energy, the three-phase 380V LED tunnel lamp lighting module is applied, wherein the research on the LED lighting dimming technology is extremely important, the existing three-phase 380V LED tunnel lamp lighting generally adopts a 0-10V analog voltage signal dimming function, and the requirement of future digital dimming cannot be met. Currently, the dimming is generally performed in a positive logic mode, that is, when the duty ratio of a PWM signal output by a dimming controller is 0%, the output power of a corresponding LED lamp is minimum; when the duty ratio of the PWM signal output by the dimming controller is 100%, the corresponding LED lamp has the maximum output power; however, when the dimming controller fails, the whole lamp may fail or even be turned off, especially, a hardware single chip or a DSP is disposed inside the dimming controller, and the dimming controller is susceptible to interference of lightning surge and the like when used outdoors, and the dimming controller may have an open circuit, a short circuit or a run-off phenomenon, and at this time, the duty ratio of the PWM signal output by the dimming controller is always 0, and the LED lamp cannot receive a normal control signal, so that the phenomenon that the whole lamp is turned off occurs, and the use of the whole lamp is affected.
The invention carries out detailed retrieval through the state intellectual property office official website retrieval service system, obtains the following prior arts, and simply introduces the prior arts so as to better understand the inventive concept of the invention and show the technical advantages and the technical characteristics of the invention.
Prior art 1: CN103108432A, which discloses an LED driver and an LED lighting device having the same; however, the cost of the prior art is still high, and the dimming function cannot be realized.
Prior art 2: CN103561523A, which discloses a light stroboscopic resistant circuit for high PF alternating current direct-drive LED circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 3: CN103716968A, which discloses a road lighting method of converting three-phase alternating current commercial power into direct current high voltage direct-drive LED; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 4: CN104135804A, which discloses a three-phase electric rectification LC high PF filtering DC high voltage direct drive LED circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 5: CN104302072A, which discloses a direct-drive LED lighting system controlled by an integrated control circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 6: CN104302073A discloses a direct-drive LED lighting system controlled by an integrated control circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 7: CN104320890A discloses a high voltage direct-drive LED lighting system; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 8: CN104320891A discloses a direct-drive LED lighting system controlled by an integrated control circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 9: CN104320892A discloses a direct-drive LED lighting system controlled by an integrated control circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 10: CN105305854A discloses an LED lighting driving power supply system for a high voltage ac system; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 11: CN105848380A discloses an LED lighting device and an LED lighting system for a three-phase ac power supply; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 12: CN203120227U discloses a LED ac direct drive circuit controlled by a multi-path low-voltage switch circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 13: CN204145854U discloses a direct-drive LED lighting system controlled by an integrated control circuit; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 14: CN210807736U discloses a discrete SIMO dimming and color-adjusting circuit; however, the wiring of the prior art is complex, and the phenomena of open circuit, short circuit or run-off still exist.
Prior art 15: JP6513162B1 discloses an LED lighting system for the same-phase-A class; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 16: JP2011077009A discloses a LIGHTING SYSTEM OF TUNNEL; however, the prior art has complicated wiring and does not have the PWM signal dimming function.
Prior art 17: JP2011238395A discloses an ILLUMINATION SYSTEM; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 18: KR1020130007861A discloses the power supply for LED lamp; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 19: US7800876B2 discloses an LED dimming circuit; however, the prior art has complicated wiring and does not have the PWM signal dimming function.
Prior art 20: US9237626B2 discloses a Dimming drive circuit of alternating current direct-drive LED module; however, the prior art has complicated wiring and does not have the PWM signal dimming function.
Prior art 21: US9445472B2 discloses a Method and circuit for driving light-emitting diodes from a needle-phase power source; however, the prior art is complicated in wiring and does not have a dimming function.
Prior art 22: US10119691B2 discloses a system and methods for improved lighting Systems; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 23: US20080191642A1 discloses a method and Apparatus for Operating Groups of High-Power Leds; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 24: US20100194298a1 discloses a LED DRIVE DEVICE LED DRIVE METHOD AND LIGHTING SYSTEM; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 25: US20100295458A1 discloses AN AC LED MODELE WITH AN IMPROVED POWER FACTOR; however, the wiring of the prior art is complicated and the dimming function cannot be realized.
Prior art 26: CN108366448B discloses a positive or negative logic LED dimming circuit and a driving power supply; however, the wiring of the prior art is complex, and the phenomena of open circuit, short circuit or run-off still exist.
As will be appreciated by those skilled in the art in light of the above description of the prior art, the following features exist in the currently available LED dimming circuits:
(1) the LED dimming circuit has complex wiring and higher cost, and still has the phenomena of open circuit, short circuit or runaway.
(2) Some prior arts can be compatible with the positive logic and the negative logic dimming, but they cannot develop a dedicated dimming driving chip, so that the manufacturing cost is still high, and in the application occasion of mass production, there is still a determination that the field construction and assembly are complex.
Therefore, it is an urgent need to solve the problem of designing an LED dimming circuit that is compatible with positive and negative logic dimming, can reduce cost, and is convenient to construct and install.
Disclosure of Invention
In view of the above situation, in order to overcome the above defects in the prior art, especially the defects that the prior art does not provide convenience for field construction and installation and simultaneously considers positive and negative logic dimming to reduce cost, the invention provides a PWM signal dimming circuit and method for a three-phase ac power supply LED lamp, which effectively solve the above problems.
Therefore, the invention provides a dimming method adopting a digital interface PWM signal, namely, the output power of the tunnel lamp is changed according to the change of the duty ratio of the PWM signal output by the dimming controller. Further, the invention also provides a negative logic dimming mode: for the PWM dimming input signal, when the dimming controller outputs PWM duty ratio of 0%, the output power of the LED lamp is maximum; when the dimming controller outputs 100% of PWM duty ratio, the output power of the LED lamp is minimum; the problems are avoided, even if the dimming controller is opened, short-circuited or runs off, the duty ratio of the PWM signal output by the external dimming controller is 0%, although the LED lamp cannot receive a normal control signal, the whole lamp is still in a state of maximum output power, the use of the whole lamp is not influenced, and the normal dimming control can be automatically recovered after the fault is eliminated.
Therefore, the invention adopts the technical proposal that,
a PWM signal dimming circuit for three-phase AC power supply LED lamp, including keeping apart opto-coupler circuit, input impedance matching circuit, driver chip circuit, MOS transistor switch circuit and LED load circuit.
Furthermore, in the PWM signal dimming circuit for the three-phase alternating current power supply LED lamp, an external PWM signal is input through the isolation optocoupler circuit and then is input into the impedance matching circuit to generate dimming signal voltage to be supplied to the driving chip circuit, the driving chip circuit controls the output of the MOS transistor switching circuit according to the change of the dimming signal voltage and the change of the current signal collected by the LED load circuit, and the MOS transistor switching circuit controls the power change of the LED load circuit.
Further, the driving chip circuit comprises a driving chip U2, and the pin connection mode of the driving chip U2 is as follows: pin 1 of the driving chip U2 is the negative end of the power supply and is grounded; the 2 pins of the driving chip U2 are dimming control pins and are connected with a resistor and a capacitor, and the 3 pins of the driving chip U2 are suspended and are empty pins; the 4 pins of the driving chip U2 are current sampling pins, are connected with a current sampling resistor and are controlled by the 2 pins; a pin 5 of the driving chip U2 is a load output pin; 6 pins of the driving chip U2 are suspended and are empty pins; the pin 7 of the driving chip U2 is an output control pin; the pin 8 of the driving chip U2 is the positive terminal of the power supply and is connected to VCC.
Further, the isolation optocoupler circuit comprises an isolation optocoupler U1 and a resistor R4; the input impedance matching circuit comprises a diode D1, a resistor R1, a resistor R2 and a capacitor C2; the driving chip circuit comprises a driving chip U2, a capacitor C1, a capacitor C3 and a resistor R3; the MOS transistor switching circuit includes a MOS transistor Q1; the LED load circuit comprises an LED lamp bead load and a resistor Rs.
Further, pin 1 of the isolation optocoupler U1 is connected with the positive phase of an external PWM signal input PWM, pin 2 of the isolation optocoupler U1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the negative phase of the external PWM signal input PWM, pin 3 of the isolation optocoupler U1 is connected with pin 8 of the driving chip U2 through a resistor R1 and is connected with the positive end of a diode D1, and pin 4 of the isolation optocoupler U1 is connected with a power ground; the negative end of the diode D1 is connected with the pin 2 of the driving chip U2 through a resistor R2; a pin 1 of the driving chip U2 is connected with a power ground, and a pin 2 of the driving chip U2 is connected with one end of a resistor R2, one end of a capacitor C2, one end of a resistor R3 and one end of a capacitor C3; the other end of the capacitor C2 is grounded, the other end of the resistor R3 and the other end of the capacitor C3 are connected with a pin 4 of the driving chip, a pin 3 of the driving chip U2 is suspended, a pin 4 of the driving chip U2 is connected with the other end of the resistor R3 and the other end of the capacitor C3, and is also connected with a source of the MOS transistor Q1 and one end of the resistor Rs, the other end of the resistor Rs is connected with a power ground, a pin 5 of the driving chip U2 is connected with an external LED load output LED positive electrode, a pin 6 of the driving chip U2 is suspended, a pin 7 of the driving chip U2 is connected with a gate of the MOS transistor Q1, a pin 8 of the driving chip U2 is connected with a power VCC and one end of the capacitor C1 besides the resistor R1, the other end of the capacitor C1 is connected with the power ground, and a drain of the MOS transistor Q1 is connected with an external LED load output LED negative electrode.
Furthermore, the isolating optocoupler U1 is in a model of PC817, the driving chip U2 is M3103 of Hefu spruce opto-electronic technology Inc., the diode D1 is in a model of 1N4001, the MOS transistor Q1 is in a model of 1N80, the resistance of the resistor R1 is 1K ohm, the resistor R2 is 100 ohm, the resistance of the resistor R3 is 4K7 ohm, the resistance of the resistor R4 is 1K ohm, the resistance of the resistor Rs is 3.9 ohm, and the capacitors C1, C2 and C3 are all 0.1uF/50V patch capacitors; VCC is a 10V direct-current power supply, the PWM signal input is connected with a signal source capable of outputting the PWM signal from the outside, the frequency is 1KHz, the amplitude is 5V, and the LED load output is connected with a three-phase 380V tunnel lamp LED circuit with 50W power.
When the duty ratio of a PWM signal of an external dimming controller Is increased, after the PWM signal passes through an isolation optocoupler circuit and an input impedance matching circuit, the dimming signal voltage acquired by a dimming control pin Is of a driving chip U2 Is increased, the output voltage of an output power control pin OUT of the driving chip U2 Is reduced, the output current of a corresponding MOS transistor Q1 Is reduced, the output current of an LED load Is reduced, and the power of an LED tunnel lamp Is reduced; on the contrary, when the duty ratio of the PWM signal of the external dimming controller Is decreased, the dimming signal voltage acquired by the dimming control pin Is of the driving chip U2 Is decreased, the output voltage of the output power control pin OUT of the driving chip U2 Is increased, the output current of the corresponding MOS transistor Q1 Is increased, the output current of the LED load Is increased, and the power of the LED tunnel lamp Is increased; therefore, a negative logic dimming mode is completed, and a dimming effect is achieved.
In summary, the present invention provides a PWM signal dimming circuit and method for a three-phase ac power supply LED lamp, which are compatible with two dimming modes, positive and negative logic, for overcoming the defects of the conventional lighting dimming technology for a three-phase 380V tunnel LED lamp. The traditional dimming mode is a positive logic dimming circuit, namely when an input signal of the dimming circuit is the maximum, the driving circuit outputs the maximum power, if no signal is input or a signal output device fails, the lamp does not light, the driving circuit provides a negative logic dimming mode, namely when the input signal of the dimming circuit is the minimum, the driving circuit outputs the maximum power, compared with the traditional circuit, even if an external device fails, the driving circuit still keeps the maximum output power, the lamp keeps the maximum brightness, and the working state of the lamp cannot be influenced by the external device. The circuit has high reliability and low failure rate.
The invention has the following beneficial effects:
1. the dimming input signal processing circuit is matched with the dimming interface of the driving chip through the isolation optocoupler to complete the dimming function, namely the output current and the output power of the driving circuit are controlled by changing the input comparison voltage of the current sampling pin of the driving chip, so that the dimming effect is realized.
2. The invention provides two dimming modes compatible with positive logic and negative logic, solves the problem that the use of the whole lamp is influenced by the faults of open circuit, short circuit or running and the like of a dimming controller when using the negative logic dimming mode, can still output the state of the maximum power when an LED lamp cannot receive a normal dimming control signal, does not influence the use of the whole lamp, and can automatically recover the normal dimming control after the faults are eliminated.
3. The invention provides a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driving chip, which comprises a dimming input signal processing circuit, an isolation optocoupler circuit, a driving chip output control circuit and the like.
Drawings
Fig. 1 is a block diagram of a PWM signal dimming circuit for a three-phase ac-powered LED lamp according to an embodiment.
Fig. 2 is a schematic diagram of a PWM signal dimming circuit for a three-phase ac-powered LED lamp according to an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the installation methods, the communication protocols and the technical terms mentioned in the present invention are technical terms that are already clearly known in the technical field, and therefore, the explanation thereof is not repeated.
The first embodiment is as follows:
as shown in fig. 1, the basic manner of implementing the dimming function in this embodiment is as follows: after an external PWM signal is input through the isolation optocoupler circuit and passes through the input impedance matching circuit, dimming signal voltage is generated and supplied to the driving chip circuit, the driving chip circuit controls the output of the MOS transistor switching circuit according to the change of the dimming signal voltage and the change of the current signal collected by the LED load circuit, and the MOS transistor switching circuit controls the power change of the LED load circuit. The method specifically comprises the following steps: when the duty ratio of a PWM signal of an external dimming controller Is increased, after the PWM signal passes through an isolation optocoupler circuit and an input impedance matching circuit, the voltage of a dimming signal acquired by a dimming control pin Is of a driving chip U2 Is increased, the output voltage of an output power control pin OUT of a driving chip U2 Is reduced, the output current of a corresponding MOS transistor Q1 Is reduced, the output current of an LED load Is reduced, and the power of an LED tunnel lamp Is reduced; on the contrary, when the duty ratio of the PWM signal of the external dimming controller Is decreased, the dimming signal voltage acquired by the dimming control pin Is of the driving chip U2 Is decreased, the output voltage of the output power control pin OUT of the driving chip U2 Is increased, the output current of the corresponding MOS transistor Q1 Is increased, the output current of the LED load Is increased, and the power of the LED tunnel lamp Is increased; therefore, a negative logic dimming mode is completed, and a dimming effect is achieved.
Example two:
as shown in fig. 2, in the present embodiment, the pins of the driver chip U2 are defined as follows: 1 foot is the power negative terminal, ground connection, 2 feet are the control tube foot of adjusting luminance, with resistance, the electric capacity is connected, 3 feet are unsettled, for empty pin, 4 feet are the electric current sampling pin, be connected with electric current sampling resistance, receive 2 foot controls simultaneously, 5 feet of driver chip U2 are load output pin, 6 feet of driver chip U2 are unsettled, for empty pin, 7 feet of driver chip U2 are the output control pin, 8 feet of driver chip U2 are the power positive terminal, connect the VCC.
The isolating optocoupler U1 is in a PC817 model, the driving chip U2 is M3103 of Hefu spruce opto-electronic technology limited, the diode D1 is in a 1N4001 model, the MOS transistor Q1 is in a 1N80 model, the resistance of the resistor R1 is 1K ohm, the resistor R2 is 100 ohm, the resistance of the resistor R3 is 4K7 ohm, the resistance of the resistor R4 is 1K ohm, the resistance of the resistor Rs is 3.9 ohm, and the capacitors C1, C2 and C3 are all 0.1uF/50V patch capacitors. VCC is a 10V direct current power supply, the input of a PWM signal is connected with a signal source capable of outputting the PWM signal from the outside, the amplitude of 1KHz is 5V, the output of an LED load is connected with a three-phase 380V tunnel lamp LED circuit with 50W power, and the main technical index of the dimming circuit is that when the duty ratio of the input PWM signal is 0%, the power of the three-phase 380V tunnel lamp is 50W; when the duty ratio of an input PWM signal is 10%, the power of the three-phase 380V tunnel lamp is 45W; when the duty ratio of the input PWM signal is 20%, the power of the three-phase 380V tunnel lamp is 40W; when the duty ratio of an input PWM signal is 30%, the power of the three-phase 380V tunnel lamp is 35W; when the duty ratio of the input PWM signal is 40%, the power of the three-phase 380V tunnel lamp is 30W; when the duty ratio of an input PWM signal is 50%, the power of the three-phase 380V tunnel lamp is 25W; when the duty ratio of an input PWM signal is 60%, the power of the three-phase 380V tunnel lamp is 20W; when the duty ratio of the input PWM signal is 70%, the power of the three-phase 380V tunnel lamp is 15W; when the duty ratio of an input PWM signal is 80%, the power of the three-phase 380V tunnel lamp is 10W; when the duty ratio of an input PWM signal is 90%, the power of the three-phase 380V tunnel lamp is 5W; when the duty ratio of an input PWM signal is 100%, the power of the three-phase 380V tunnel lamp is 0.5W; the linearity of dimming is better than 1%.
Example three:
similar to the two embodiments, in this embodiment, a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driving chip interface includes an isolation optocoupler U1, a driving chip U2, a diode D1, a MOS transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor Rs, a capacitor C1, a capacitor C2, a capacitor C3, and the like. Pin 1 of the isolation optocoupler U1 is connected with the positive phase of an external PWM signal input PWM, pin 2 of the isolation optocoupler U1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the negative phase of the external PWM signal input PWM, pin 3 of the isolation optocoupler U1 is connected with pin 8 of a driving chip U2 through a resistor R1 and is connected with the positive end of a diode D1, and pin 4 of the isolation optocoupler U1 is connected with the power ground. The negative terminal of the diode D1 is connected to pin 2 of the driver chip U2 through a resistor R2. The pin 1 of the driving chip U2 is connected with a power ground, the pin 2 of the driving chip U2 is connected with one end of a resistor R2, one end of a capacitor C2, one end of a resistor R3 and one end of a capacitor C3, the other end of a capacitor C2 is grounded, the other end of a resistor R3 and the other end of a capacitor C3 are connected with the pin 4 of the driving chip, the pin 3 of the driving chip U2 is suspended, the pin 4 of the driving chip U2 is connected with the other end of a resistor R3 and the other end of a capacitor C3, the pin 3 of a MOS transistor Q1 and one end of a resistor Rs, the other end of the resistor Rs is connected with the power ground, the pin 5 of the driving chip U2 is connected with the anode of an external LED load output LED, the pin 6 of the driving chip U2 is suspended, the pin 7 of the driving chip U2 is connected with the pin 1 of the MOS transistor Q1, the pin 8 of the driving chip U2 is connected with a resistor R1 and one end of a power supply VCC and a capacitor C1, the other end of the capacitor C1 is connected with the power ground, and the pin 2 of the MOS transistor Q1 is connected with the cathode of the external LED load output LED.
When the dimming circuit works normally, the output signal of external PWM dimming equipment is connected with the PWM signal input end of the driving circuit, and the specific working mechanism is as follows: when the duty ratio of a PWM signal output by an external PWM dimming device changes, the output of an isolation optocoupler U1 changes along with the change, a dimming voltage signal is generated at a pin 2 of a driving chip U2 through an impedance matching circuit composed of a diode D1, a resistor R1, a resistor R2 and a capacitor C2, the driving chip U2 outputs a power control signal to control the output of a MOS transistor Q1 at a pin 7 according to the change of the dimming signal voltage at the pin 2 and the load current sampling voltage at the pin 4, and therefore the change of the output power is realized: when the PWM duty ratio output by the external dimming controller increases, the input dimming voltage acquired by the dimming control pin Is of the driving chip U2 increases, the output voltage of the output power control pin OUT of the driving chip U2 decreases, the output current of the corresponding MOS transistor Q1 decreases, the LED load output current decreases, and the power of the LED tunnel lamp decreases; on the contrary, when the PWM duty ratio output by the external dimming controller Is smaller, the input dimming voltage collected by the dimming control pin Is of the driving chip U2 Is smaller, the output voltage of the output power control pin OUT of the driving chip U2 Is larger, the output current of the corresponding MOS transistor Q1 Is larger, the LED load output current Is larger, and the power of the LED tunnel lamp Is larger; therefore, a negative logic dimming mode is completed, and a dimming effect is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (7)
1. A PWM signal dimming circuit for three-phase AC power supply LED lamp which characterized in that: the circuit comprises an isolation optocoupler circuit, an input impedance matching circuit, a driving chip circuit, an MOS transistor switch circuit and an LED load circuit.
2. The PWM signal dimming circuit for a three-phase ac powered LED lamp according to claim 1, wherein: after an external PWM signal is input through the isolation optocoupler circuit and passes through the input impedance matching circuit, dimming signal voltage is generated and supplied to the driving chip circuit, the driving chip circuit controls the output of the MOS transistor switching circuit according to the change of the dimming signal voltage and the change of the current signal collected by the LED load circuit, and the MOS transistor switching circuit controls the power change of the LED load circuit.
3. The PWM signal dimming circuit for a three-phase ac powered LED lamp according to claim 1 or 2, wherein: the driving chip circuit comprises a driving chip U2, and the pin connection mode of the driving chip U2 is as follows: pin 1 of the driving chip U2 is the negative end of the power supply and is grounded; the 2 pins of the driving chip U2 are dimming control pins and are connected with a resistor and a capacitor, and the 3 pins of the driving chip U2 are suspended and are empty pins; the 4 pins of the driving chip U2 are current sampling pins, are connected with a current sampling resistor and are controlled by the 2 pins; a pin 5 of the driving chip U2 is a load output pin; 6 pins of the driving chip U2 are suspended and are empty pins; the pin 7 of the driving chip U2 is an output control pin; the pin 8 of the driving chip U2 is the positive terminal of the power supply and is connected to VCC.
4. The PWM signal dimming circuit for the three-phase AC power supply LED lamp according to any one of claims 1 to 3, wherein: the isolation optocoupler circuit comprises an isolation optocoupler U1 and a resistor R4; the input impedance matching circuit comprises a diode D1, a resistor R1, a resistor R2 and a capacitor C2; the driving chip circuit comprises a driving chip U2, a capacitor C1, a capacitor C3 and a resistor R3; the MOS transistor switching circuit includes a MOS transistor Q1; the LED load circuit comprises an LED lamp bead load and a resistor Rs.
5. The PWM signal dimming circuit for a three-phase AC powered LED lamp of claim 4, wherein: pin 1 of the isolation optocoupler U1 is connected with the positive electrode of an external PWM signal input PWM, pin 2 of the isolation optocoupler U1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the negative electrode of the external PWM signal input PWM, pin 3 of the isolation optocoupler U1 is connected with pin 8 of a driving chip U2 through a resistor R1 and is simultaneously connected with the positive end of a diode D1, and pin 4 of the isolation optocoupler U1 is connected with the power ground; the negative end of the diode D1 is connected with the pin 2 of the driving chip U2 through a resistor R2; a pin 1 of the driving chip U2 is connected with a power ground, and a pin 2 of the driving chip U2 is connected with one end of a resistor R2, one end of a capacitor C2, one end of a resistor R3 and one end of a capacitor C3; the other end of the capacitor C2 is grounded, the other end of the resistor R3 and the other end of the capacitor C3 are connected with the 4 pin of the driving chip, the 3 pin of the driving chip U2 is suspended, the 4 pin of the driving chip U2 is connected with the other end of the resistor R3 and the other end of the capacitor C3, the 3 pin of the MOS transistor Q1 and one end of the resistor Rs are also connected, the other end of the resistor Rs is connected with a power ground, the 5 pin of the driving chip U2 is connected with the anode of an external LED load output LED, the 6 pin of the driving chip U2 is suspended, the 7 pin of the driving chip U2 is connected with the 1 pin of the MOS transistor Q1, the 8 pin of the driving chip U2 is connected with the resistor R1, the power VCC and one end of the capacitor C1, the other end of the capacitor C1 is connected with the power ground, and the 2 pin of the transistor Q1 is connected with the cathode of the external LED load output LED.
6. The PWM signal dimming circuit for a three-phase AC powered LED lamp of claim 5, wherein: the isolation optocoupler U1 is in a PC817 model, the driving chip U2 is M3103 of Hefu spruce opto-electronic technology limited, the diode D1 is in a 1N4001 model, the MOS transistor Q1 is in a 1N80 model, the resistance of the resistor R1 is 1K ohm, the resistor R2 is 100 ohm, the resistance of the resistor R3 is 4K7 ohm, the resistance of the resistor R4 is 1K ohm, the resistance of the resistor Rs is 3.9 ohm, and the capacitors C1, C2 and C3 are all 0.1uF/50V patch capacitors; VCC is a 10V direct-current power supply, the PWM signal input is connected with a signal source capable of outputting the PWM signal from the outside, the frequency is 1KHz, the amplitude is 5V, and the LED load output is connected with a three-phase 380V tunnel lamp LED circuit with 50W power.
7. The PWM signal dimming method for the three-phase alternating current power supply LED lamp is characterized by comprising the following steps of: for dimming the dimming circuit of any one of claims 1, 2, 3, 5, 6; when the duty ratio of a PWM signal of an external dimming controller Is increased, after the PWM signal passes through an isolation optocoupler circuit and an input impedance matching circuit, the voltage of a dimming signal collected by a pin 2 of a driving chip U2, namely a dimming control pin Is, Is increased, the output voltage of a pin 7 of a driving chip U2, namely an output power control pin OUT, Is reduced, the output current of a corresponding MOS transistor Q1 Is reduced, the output current of an LED load circuit Is reduced, and the power of an LED tunnel lamp Is reduced; on the contrary, when the duty ratio of the PWM signal of the external dimming controller Is decreased, the dimming signal voltage collected by pin 2 of the driving chip U2, i.e., the dimming control pin Is, Is decreased, the output voltage of pin 7 of the driving chip U2, i.e., the output power control pin OUT, Is increased, the output current of the corresponding MOS transistor Q1 Is increased, the output current of the LED load circuit Is increased, and the power of the LED tunnel lamp Is increased.
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