CN113677058A - Light-adjusting control device for light-emitting diode lighting product and implementation method thereof - Google Patents
Light-adjusting control device for light-emitting diode lighting product and implementation method thereof Download PDFInfo
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- CN113677058A CN113677058A CN202110989641.4A CN202110989641A CN113677058A CN 113677058 A CN113677058 A CN 113677058A CN 202110989641 A CN202110989641 A CN 202110989641A CN 113677058 A CN113677058 A CN 113677058A
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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]
- H05B45/10—Controlling the intensity of the light
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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]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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
- H05B45/37—Converter 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
- 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]
Abstract
The invention discloses a light-dimming control device of a light-emitting diode lighting product, which comprises a light-dimming device connected with a lighting device, wherein the light-dimming device comprises an alternating current-direct current conversion circuit, the output end of the alternating current-direct current conversion circuit is connected with the input end of a driving isolation circuit, the output end of the driving isolation circuit is respectively connected with the lighting device and the input end of a voltage detection circuit, the light-dimming device also comprises a signal conversion circuit, the output end of the signal conversion circuit is connected with the input end of the voltage detection circuit, the output end of the voltage detection circuit is connected with the input end of a signal feedback circuit, and the output end of the signal feedback circuit is connected with the input end of the driving isolation circuit. The invention also discloses an implementation method of the dimming control device of the LED lighting product. The invention can realize the dimming function without changing any design of the lighting product, is convenient to use, saves the reconstruction resources, has low cost and does not influence the safety characteristic of the lighting product.
Description
Technical Field
The invention belongs to the technical field of light modulation of diode lighting, and particularly relates to a light modulation control device of a light emitting diode lighting product and an implementation method thereof.
Background
Along with the development of society, the energy-saving and environment-friendly light source using the light-emitting diode for illumination is more and more widely applied, laws and regulations for the light-emitting diode illumination application at home and abroad are more and more perfect, and application scenes of a dimmable light-emitting diode illumination product are more and more applied for different applications.
However, the prior art has the following technical problems:
1. the product which can not be adjusted to light is changed into the product which can be adjusted to light, and the product needs to be upgraded, thereby causing resource waste.
2. The cost is increased and the manufacturing cost is high by changing a new product with adjustable light.
3. In some circumstances, modifications to the overall wiring are required, adding additional cost.
4. Some products can affect the safety design of the product after being replaced.
Disclosure of Invention
The present invention is directed to a light modulation control device for led lighting products, so as to solve the problems mentioned in the background art. The dimming control device for the LED lighting product provided by the invention has the characteristics of convenience in use, resource saving in reconstruction, low cost and no influence on the safety characteristic of the lighting product.
The invention also aims to provide a realization method of the dimming control device of the light-emitting diode lighting product.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a light-emitting diode lighting product dimming control device, include the device of adjusting luminance of being connected with lighting device, the device of adjusting luminance includes AC/DC converting circuit, AC/DC converting circuit's output is connected with drive isolating circuit's input, drive isolating circuit's output is connected with lighting device and voltage detection circuit's input respectively, the device of adjusting luminance still includes signal conversion circuit, signal conversion circuit's output is connected with voltage detection circuit's input, voltage detection circuit's output is connected with signal feedback circuit's input, signal feedback circuit's output and drive isolating circuit's input are connected.
Furthermore, the voltage detection circuit comprises a chip U4, wherein a pin 1 and a pin 2 of the chip U4 are respectively connected with a resistor R56 and a resistor R55, the other end of the resistor R55 is an input end, a pin 3 of the chip U4 is connected with an S pole of a field-effect transistor Q6, a G pole of the field-effect transistor Q6 is connected with the signal conversion circuit, and a D pole of the field-effect transistor Q6 is connected with a resistor R58.
Furthermore, the voltage detection circuit further comprises a double operational amplifier U7-B, the other ends of a resistor R56 and a resistor R58 are respectively connected with a pin 5 of the double operational amplifier U7-B and a resistor R57, a pin 6 of the double operational amplifier U7-B is respectively connected with a resistor R52 and a capacitor C31, the other ends of a resistor R52 and a capacitor C31 are respectively connected with a pin 7 of the double operational amplifier U7-B and a resistor R53, the resistor R53 is respectively connected with a capacitor C23 and a resistor R54, and the other end of the resistor R54 is respectively connected with a diode D11 and a capacitor C24.
Furthermore, the signal conversion circuit comprises a chip U5, wherein a pin 5 of the chip U5 is connected with a capacitor C25, a diode ZD3 and a diode D14, a pin 8 of the chip U5 is connected with a resistor R66 and a resistor R67, the other end of the diode D14 is connected with a resistor R62, the resistor R62 is connected with a pin 1 of an inductor L5, pins 3 and 4 of the inductor L5 are dimming signal input terminals, the other end of the resistor R66 is connected with a collector of a triode Q9, and the other end of the resistor R67 is connected with a diode Z5 and a base of a triode Q9.
Furthermore, the signal conversion circuit further comprises a chip U8, an emitter of a transistor Q9 is connected to a capacitor C29 and a pin 1 of the chip U8, respectively, a pin 3 of the chip U8 is connected to a pin 6 of the chip U5, a pin 8 of the chip U8 is connected to an emitter of a transistor Q8 and the capacitor C41, respectively, a pin 6 of a chip U8 is connected to the voltage detection circuit, a base of the transistor Q8 is connected to a diode Z4 and a resistor R65, a collector of the transistor Q8 is connected to a resistor R64, and the other end of the resistor R64 is connected to the other end of the resistor R65.
Furthermore, the signal feedback circuit comprises a chip U3, a pin 1 of the chip U3 is connected with a resistor R46 and a resistor R45, a pin 2 of the chip U3 and the other end of the resistor R46 are connected with a diode D12, the other end of the diode D12 is connected with a voltage detection circuit, and a pin 4 of the chip U3 is connected with a drive isolation circuit.
Furthermore, the dimming device also comprises a pulse generating circuit, and the output end of the pulse generating circuit is connected with the input end of the voltage detection circuit.
Furthermore, the pulse generation circuit comprises a field effect transistor Q7, a G pole of a field effect transistor Q7 is connected with a diode Z6, a resistor R59 and a capacitor C32, a D pole of a field effect transistor Q7 is connected with a resistor R68, a resistor R69 and a capacitor C36, and the other end of a resistor R68 is connected with the voltage detection circuit.
Furthermore, the output end of the driving isolation circuit is connected with an output filter circuit, the output filter circuit comprises a triode Q5, the collector of the triode Q5 is respectively connected with the driving isolation circuit and a resistor R44, the base of the triode Q5 is respectively connected with the other end of a resistor R44 and a diode Z2, the other end of the diode Z2 is connected with a capacitor C20, and the emitter of the triode Q5 is respectively connected with a capacitor C20 and a voltage detection circuit.
Further, the implementation method of the dimming control device for the led lighting product in the present invention includes the following steps:
the alternating current-direct current conversion circuit converts alternating current into direct current to be output to the driving isolation circuit, and the driving isolation circuit outputs voltage to the output filter circuit;
secondly, the voltage detection circuit samples the output voltage of the output filter circuit, compares the output voltage with the reference voltage generated by the chip U4 to obtain a feedback signal, and transmits the feedback signal to the drive isolation circuit through the signal feedback circuit to adjust the voltage stability and consistency;
after the lighting device is powered on, the pulse generating circuit generates a pulse high-voltage signal and outputs the pulse high-voltage signal to the voltage detection circuit, the pulse high-voltage signal is used as a supplementary signal of a reference voltage signal, the pulse high-voltage signal and the reference voltage are synthesized into a voltage with a pulse waveform, the voltage is transmitted to the driving isolation circuit through the signal feedback circuit, and a short-time high-pulse output voltage is provided to start the lighting device;
and when the signal conversion circuit receives the dimming signal, the dimming signal is converted into a PWM pulse width signal and is output to the voltage detection circuit, the voltage detection circuit synthesizes the PWM pulse width signal into a direct current control signal and transmits the direct current control signal to the drive isolation circuit through the signal feedback circuit, and the direct current voltage signal is output through the output filter circuit to carry out dimming control on the lighting device.
Compared with the prior art, the invention has the beneficial effects that:
1. the input and output electrical isolation is realized by driving the isolation circuit, and a stable direct current voltage is obtained after output rectification and filtering, so that power supply is respectively realized for the voltage detection circuit and the signal conversion circuit;
2. the invention realizes the output voltage sampling through the voltage detection circuit, forms a feedback control signal by comparing with the reference voltage of the comparator, is connected with the signal feedback circuit, simultaneously converts the PWM signal into a stable DC reference voltage signal, references the comparison circuit and realizes the generation of the started pulse reference voltage signal;
3. at the moment of starting through the pulse generating circuit, a step signal S _ VCC3 is converted into a pulse voltage reference signal which is connected with a pin 3 of a double operational amplifier U7 and used as a control signal of output pulse voltage when starting;
4. the invention realizes the conversion of dimming signals such as PWM,0-10V and other signals into uniform PWM control signals through the signal conversion circuit, realizes the mutual isolation between the control signal circuit part and other circuits, realizes the isolated transmission of the signals to obtain the PWM signals, and realizes the signal transmission and processing between the dimming signals and the voltage detection circuit by connecting the pin 6 of the chip U8 with the grid electrode of the field effect transistor Q6;
5. the invention can realize the dimming function without changing any design of the lighting product, is convenient to use, saves the reconstruction resources, has low cost and does not influence the safety characteristic of the lighting product.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block diagram of a light modulating device according to the present invention;
FIG. 3 is a circuit diagram of an EMI filter circuit according to the present invention;
FIG. 4 is a circuit diagram of the PF correction circuit of the present invention;
FIG. 5 is a circuit diagram of the voltage detection circuit of the present invention;
FIG. 6 is a schematic circuit diagram of an AC/DC converter circuit according to the present invention;
FIG. 7 is a circuit diagram of a pulse generating circuit according to the present invention;
FIG. 8 is a circuit diagram of the driving isolation circuit of the present invention;
FIG. 9 is a circuit diagram of an output filter circuit according to the present invention;
FIG. 10 is a circuit diagram of a signal feedback circuit according to the present invention;
FIG. 11 is a circuit diagram of a signal conversion circuit according to the present invention;
in the figure: 1. a light adjusting device; 2. an illumination device; 3. a dimming signal; 4. an EMI filter circuit; 5. an AC-DC conversion circuit; 6. a PF correction circuit; 7. a drive isolation circuit; 8. a voltage detection circuit; 9. a pulse generating circuit; 10. a signal conversion circuit; 11. a signal feedback circuit; 12. and an output filter circuit.
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.
Example 1
Referring to fig. 1-11, the present invention provides the following technical solutions: a light modulation control device of a light emitting diode lighting product comprises a light modulation device 1 connected with a lighting device 2, the lighting device 2 is the light emitting diode lighting product, the light modulation device 1 comprises an EMI filter circuit 4, the input end of the EMI filter circuit 4 is connected with a mains supply, the output end of the EMI filter circuit 4 is connected with the input end of an AC-DC conversion circuit 5, the output end of the AC-DC conversion circuit 5 is connected with the input end of a PF correction circuit 6, the output end of the PF correction circuit 6 is connected with the input end of a driving isolation circuit 7, the output end of the driving isolation circuit 7 is connected with the input end of an output filter circuit 12, the output end of the output filter circuit 12 is respectively connected with the lighting device 2 and the input end of a voltage detection circuit 8, the light modulation control device further comprises a pulse generation circuit 9 and a signal conversion circuit 10, the output ends of the pulse generation circuit 9 and the signal conversion circuit 10 are respectively connected with the input end of the voltage detection circuit 8, the output end of the voltage detection circuit 8 is connected with the input end of the signal feedback circuit 11, and the output end of the signal feedback circuit 11 is connected with the input end of the drive isolation circuit 7.
Specifically, the EMI filter circuit 4 includes an inductor L1 and an inductor L2, wherein a pin 1 of the inductor L1 is connected to the neutral line N, the adjustable resistor ZV1 and the adjustable resistor ZV1, the other end of the adjustable resistor ZV1 is connected to the impedance Z1 and the adjustable resistor ZV1, a pin 2 of the inductor L1 is connected to the other ends of the adjustable resistor ZV1 and the molded resistor RN1, the other end of the molded resistor RN1 is connected to the fuse F1, the other end of the fuse F1 is connected to the live line L, a pin 4 of the inductor L1, a pin CY 1 of the capacitor CX1, a pin 3 of the inductor L1, the other end of the capacitor CX1 is connected to the pin 3 of the inductor L1, a pin R1 and the pin 1 of the inductor L1, the other end of the resistor R1 is connected to one end of the resistor R1, the other end of the resistor CY 1 is connected to the other end of the capacitor CY 1, the other end of the capacitor CY 1 is connected to the impedance GND, the 2 pin of the inductor L2 is connected with the capacitor CX3, the other end of the capacitor CX3 is connected with the 4 pin of the inductor L2, and the 2 pin and the 4 pin of the inductor L2 are also connected with the AC-DC conversion circuit 5.
Through adopting above-mentioned technical scheme, carry out the filtering to exchanging the commercial power through EMI filter circuit 4.
Specifically, the ac-dc conversion circuit 5 includes a rectifier bridge D1, the 3 rd pin and the 4 th pin of the rectifier bridge D1 are connected to the EMI filter circuit 4, the 1 st pin of the rectifier bridge D1 is grounded, the 2 nd pin of the rectifier bridge D1 is connected to the resistor R4, the inductor L4 and the capacitor C1, the other end of the capacitor C1 is grounded, and the other ends of the resistor R4 and the inductor L4 are connected to the PF correction circuit 6.
By adopting the technical scheme, alternating current is converted into direct current.
Specifically, the PF correction circuit 6 includes a chip U1, a pin 1 of the chip U1 is connected to a resistor R18, a resistor R19 and a capacitor C7, the other end of the resistor R18 is connected to a resistor R17, the other end of the resistor R17 is connected to a resistor R16, the other end of the resistor R16 is connected to the driving isolation circuit 7, a pin 2 of the chip U1 is connected to a capacitor C8 and a capacitor C9, the other end of the capacitor C9 is connected to a resistor R20, a pin 4 of the chip U1 is connected to a capacitor C4 and a resistor R13, the other end of the resistor R13 is connected to a resistor R7, a resistor R8, the S pole of the fet Q1, a capacitor C1, a resistor R1 and a resistor R1, the other ends of the capacitors C1, the resistor R1, the other ends of the resistor R1, the other ends of the resistor R1 and the resistor R1 are connected to a diode R367, the other end of the resistor R1 and the resistor R1 are connected to the diode R1, the other ends of the diode D4, the resistor R6 and the resistor R7 are respectively connected to the G-pole of the fet Q1, the D-pole of the fet Q1 and the other end of the capacitor C2 are connected to the resistor BD1, the other end of the resistor BD1 is connected to the resistor BD2 and the 4-pole of the inductor T1, the 5-pole of the chip U1 is connected to the resistor R14, the other end of the resistor R14 is connected to the 3-pole of the capacitor C34 and the inductor T1, the 8-pole of the chip U1 is connected to the resistor R10, the capacitor C6 and the emitter of the transistor Q10, the other end of the resistor R10 is connected to the resistor R12, the other end of the resistor R12 is connected to the resistor R11, the other end of the resistor R11 is connected to the capacitor C11 and the ac/dc conversion circuit 5, the 1-pole of the inductor T11, the diode D11 and the capacitor C11, the other end of the capacitor C11 is connected to the collector of the diode Z11 and the resistor R11, the other end of the resistor R15 is connected with a diode D5, the other end of the diode D5 is connected with a capacitor C34 and a diode D7 respectively, the other end of the capacitor C34 is connected with a pin 3 of an inductor T1, the other end of the diode D7 and a pin 2 of the inductor T1 are connected with a ground terminal respectively, the other end of the resistor BD2 is connected with a diode D3 and a diode D15 respectively, the other end of the diode D15 is connected with a capacitor C3, the other end of the diode D3 is connected with the drive isolation circuit 7, the capacitor C38, a diode D2 and the other end of the capacitor C27, and the other ends of the capacitor C3 and the capacitor C38 are connected with the ground terminal.
By adopting the technical scheme, the phase of the input circuit and the waveform of the rectified current are adjusted, and stable direct-current voltage is output.
Specifically, the driving isolation circuit 7 includes a chip U2, a pin 1 of the chip U2 is connected to a ground terminal, a pin 2 of the chip U2 is connected to a diode D13 and a resistor R26, respectively, the other end of the diode D13 is connected to a resistor R27, the other ends of the resistor R27 and the resistor R26 are connected to a G pole of a resistor R28 and a G pole of a fet Q2, respectively, the other end of the resistor R28 is connected to a resistor R31, a resistor R34, a resistor R35, a resistor R36, and an S pole of the fet Q2, the other end of the resistor R31 is connected to an 8 pin of the chip U2, the other ends of the resistor R34, the resistor R35, and the resistor R36 are grounded, the D pole of the fet Q2 is connected to a pin 3 of a diode D6, a capacitor C10, and a pin 3 of an inductor T2, the other end of the capacitor C2 is connected to the other end of the diode D2, the resistor R2, the resistor 36r 2, the resistor 2, the other ends of the resistor R, the resistor R and the capacitor C are respectively connected with a pin 1 of an inductor T and a PF correction circuit 6, a pin 5 of the chip U is respectively connected with the capacitor C and an emitting electrode of a triode Q, a base electrode of the triode Q is respectively connected with the resistor R and a diode Z, a collector electrode of the triode Q is respectively connected with the other end of the resistor R, the resistor R and the capacitor C, the other ends of the capacitor C and the diode Z are grounded, the other end of the resistor R is connected with a diode D, the other end of the diode D is connected with the resistor R and a pin 5 of the inductor T, the other end of the resistor R is respectively connected with a pin 6 of the chip U, the resistor R and the capacitor C, the resistor R and the capacitor C are respectively connected with a grounding end, a pin 7 of the chip U is connected with the capacitor C and a signal feedback circuit 11, the other end of the capacitor C14 is grounded, the 2-pin of the inductor T2 is connected to the resistor R40, the resistor R39, the diode D8 and the diode D16, the other ends of the diode D8 and the diode D16 are connected to the resistor R41, the capacitor C37, the capacitor C21, the 1-pin of the inductor L3, the capacitor C28 and the output filter circuit 12, the other end of the capacitor C28 is connected to the other ends of the resistor R40 and the resistor R39, the 3-pin and the 4-pin of the inductor L3 are connected to the lighting device 2, the 6-pin of the inductor T2 is connected to the diode D9, the other end of the diode D9 is connected to the resistor R42, the other end of the resistor R42 is connected to the capacitor C18, the resistor R43 and the collector of the triode Q3, the other end of the resistor R43 is connected to the base of the triode Q3 and the diode Z1, the diode Z1, the capacitor C18 and the 8-pin of the inductor T2 are grounded; the output filter circuit 12 comprises a triode Q5, the collector of the triode Q5 is respectively connected with the drive isolation circuit 7 and the resistor R44, the base of the triode Q5 is respectively connected with the other end of the resistor R44 and the diode Z2, the other end of the diode Z2 is connected with the capacitor C20, and the emitter of the triode Q5 is respectively connected with the capacitor C20 and the voltage detection circuit 8.
By adopting the technical scheme, the drive isolation circuit 7 obtains energy from the high-voltage direct current output by the PF correction circuit 6, so that input and output electrical isolation is realized, and a stable direct current voltage is obtained after output rectification filtering; and through the above scheme, power is supplied to the voltage detection circuit 8 and the signal conversion circuit 10 respectively, and the voltage detection circuit 8 and the signal conversion circuit 10 are isolated from each other.
Specifically, the voltage detection circuit 8 includes a chip U4, pins 1 and 2 of the chip U4 are respectively connected to a resistor R56, a resistor R55 and a pulse generation circuit 9, the other end of the resistor R55 is connected to the output filter circuit 12, pin 3 of the chip U4 is connected to the S-pole of the fet Q6, the G-pole of the fet Q6 is connected to the signal conversion circuit 10, the D-pole of the fet Q6 is connected to a resistor R58, the other ends of the resistor R56 and the resistor R58 are respectively connected to the pin 5 of the dual operational amplifier U7-B and the resistor R57, the other end of the resistor R57 is grounded, the pin 6 of the dual operational amplifier U7-B is respectively connected to a resistor R7 and a capacitor C7, the other ends of the resistor R7 and the capacitor C7 are respectively connected to the pin 7 of the dual operational amplifier U7-B and the resistor R7, the resistor R7 is respectively connected to the other end of the capacitor C7 and the diode D7, the other ends of the capacitor C23 and the capacitor C24 are grounded, the other end of the diode D11 is connected with a pin 3 of the dual operational amplifier U7-A and the capacitor C35, a pin 2 of the dual operational amplifier U7-A is connected with a resistor R50, a resistor R51, a resistor R48, a resistor R49 and a capacitor C22, the other end of the capacitor C22 is connected with the resistor R47, and the resistor R47, the resistor R48 and a pin 1 of the dual operational amplifier U7-A are all connected with the signal feedback circuit 11.
By adopting the technical scheme, the output voltage sampling is realized, and the output voltage is compared with the reference voltage of the comparator to form a feedback control signal which is connected to the signal feedback circuit 11; meanwhile, the PWM signal is converted into a stable direct current reference voltage signal, and the stable direct current reference voltage signal is used as a reference for a comparison circuit; and the generation of the starting pulse reference voltage signal is realized.
Specifically, the pulse generation circuit 9 includes a field-effect transistor Q7, a G-pole of the field-effect transistor Q7 is connected to a diode Z6, a resistor R59, and a capacitor C32, a D-pole of the field-effect transistor Q7 is connected to a resistor R68, a resistor R69, and a capacitor C36, the capacitors C36, the resistor R69, the resistor R59, and the diode Z6 are all grounded, and the other end of the resistor R68 is connected to the voltage detection circuit 8.
By adopting the technical scheme, at the moment of starting, a step signal S _ VCC3 is converted into a pulse voltage reference signal, and the pulse voltage reference signal is connected with a pin 3 of the double operational amplifier U7 and is used as a control signal for outputting pulse voltage during starting.
Specifically, the signal conversion circuit 10 includes a chip U, pin 2 of the chip U is connected to a resistor R, the other end of the resistor R is connected to pin 3 of the chip U and the resistor R, pin 4 of the chip U is connected to a capacitor C, pin 5 of the chip U is connected to a capacitor C, a diode ZD and a diode D, pin 7 of the chip U is connected to the resistor R, pin 8 of the chip U is connected to a capacitor C, a resistor R and a resistor R, pin 1 of the chip U, a resistor R, a diode ZD, a capacitor C, a resistor R and the other end of the capacitor C are grounded, the other end of the diode D is connected to the resistor R, the resistor R is connected to a capacitor C and pin 1 of an inductor L, pin 2 of the inductor L and the other end of the capacitor C are grounded, pin 3 and pin 4 of the inductor L are connected to a dimming signal 3, the other end of the resistor R is connected to a collector of the triode Q, the other end of the resistor R67 is connected with the base of a diode Z5 and a triode Q9, the emitter of the triode Q9 is respectively connected with a capacitor C29 and a pin 1 of a chip U8, the capacitor C29, a pin 4 of the chip U8 and the other end of the diode Z5 are grounded, a pin 3 of the chip U8 is connected with a pin 6 of the chip U5, a pin 8 of the chip U8 is respectively connected with the emitter of the triode Q8 and a capacitor C41, a pin 5 of the chip U8 and the other end of the capacitor C41 are grounded, a pin 6 of the chip U8 is connected with a voltage detection circuit 8, the base of the triode Q8 is respectively connected with a diode Z4 and a resistor R65, the other end of the diode Z4 is grounded, the collector of the triode Q8 is connected with a resistor R64, and the other end of the resistor R64 is connected with the other end of the resistor R65.
By adopting the technical scheme, the dimming signals such as PWM,0-10V and other signals are converted into uniform PWM control signals, meanwhile, the control signal circuit part is isolated from other circuits, isolated transmission of the signals is realized, the PWM signals are obtained, the pin 6 of the chip U8 is connected with the grid electrode of the field effect transistor Q6, and signal transmission and processing from the dimming signals to the voltage detection circuit 8 are realized.
Specifically, the signal feedback circuit 11 includes a chip U3, a pin 3 of the chip U3 is grounded, a pin 1 of the chip U3 is connected to a resistor R46 and a resistor R45, a pin 2 of the chip U3 and the other end of the resistor R46 are connected to a diode D12, the other end of the diode D12 is connected to the voltage detection circuit 8, and a pin 4 of the chip U3 is connected to the driving isolation circuit 7.
By adopting the technical scheme, the feedback control signal of the voltage detection circuit 8 is connected with the drive isolation circuit 7, the primary isolation and the secondary isolation of the feedback signal are realized, and the transmission of the feedback signal to the chip U2 of the drive isolation circuit 7 is realized.
Example 2
Further, the implementation method of the dimming control device for the light emitting diode lighting product comprises the following steps:
the EMI filter circuit 4 filters alternating current mains supply and outputs the alternating current mains supply to an alternating current-direct current conversion circuit 5;
secondly, the alternating current-direct current conversion circuit 5 converts alternating current into direct current and outputs the direct current to the PF correction circuit 6;
thirdly, the PF correction circuit 6 adjusts the phase of the input circuit and the waveform of the rectified current and outputs stable direct-current voltage to the drive isolation circuit 7;
fourthly, the drive isolation circuit 7 outputs voltage to the output filter circuit 12;
fifthly, the voltage detection circuit 8 samples the output voltage of the output filter circuit 12, compares the output voltage with the reference voltage generated by the chip U4 to obtain a feedback signal, and transmits the feedback signal to the drive isolation circuit 7 through the signal feedback circuit 11 to adjust the voltage stability and consistency;
after the lighting device 2 is powered on, the pulse generating circuit 9 generates a pulse high-voltage signal to be output to the voltage detecting circuit 8, the pulse high-voltage signal is used as a supplementary signal of a reference voltage signal, the pulse high-voltage signal and the reference voltage are synthesized into a voltage with a pulse waveform, the voltage is transmitted to the driving isolation circuit 7 through the signal feedback circuit 11, and a short-time high-pulse output voltage is provided to start the lighting device 2;
and when the signal conversion circuit 10 receives the dimming signal 3, the dimming signal is converted into a PWM pulse width signal and output to the voltage detection circuit 8, the voltage detection circuit 8 synthesizes the PWM pulse width signal into a direct current control signal and transmits the direct current control signal to the drive isolation circuit 7 through the signal feedback circuit 11, and the direct current voltage signal is output through the output filter circuit 12 to perform dimming control on the lighting device 2.
The model of the chip U1 is BP 2628; the model of the chip U2 is SY 5019; the model number of the chip U4 is TL 431; the model of the dual operational amplifier U7 is LM 358; the chip U8 is model number PAI 120.
In summary, the phase of the input circuit and the waveform of the rectified current are adjusted by the PF correction circuit, so that stable dc voltage is output; the input and output electrical isolation is realized by driving the isolation circuit, and a stable direct current voltage is obtained after output rectification and filtering, so that power supply is respectively realized for the voltage detection circuit and the signal conversion circuit; the invention realizes the output voltage sampling through the voltage detection circuit, forms a feedback control signal by comparing with the reference voltage of the comparator, is connected with the signal feedback circuit, simultaneously converts the PWM signal into a stable DC reference voltage signal, references the comparison circuit and realizes the generation of the started pulse reference voltage signal; at the moment of starting through the pulse generating circuit, a step signal S _ VCC3 is converted into a pulse voltage reference signal which is connected with a pin 3 of a double operational amplifier U7 and used as a control signal of output pulse voltage when starting; the invention realizes the conversion of dimming signals such as PWM,0-10V and other signals into uniform PWM control signals through the signal conversion circuit, realizes the mutual isolation between the control signal circuit part and other circuits, realizes the isolated transmission of the signals to obtain the PWM signals, and realizes the signal transmission and processing between the dimming signals and the voltage detection circuit by connecting the pin 6 of the chip U8 with the grid electrode of the field effect transistor Q6; the invention can realize the dimming function without changing any design of the lighting product, is convenient to use, saves the reconstruction resources, has low cost and does not influence the safety characteristic of the lighting product.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A light modulation control device for light emitting diode lighting products is characterized in that: the dimming device comprises an alternating current-direct current conversion circuit, the output end of the alternating current-direct current conversion circuit is connected with the input end of a driving isolation circuit, the output end of the driving isolation circuit is connected with the input ends of the lighting device and a voltage detection circuit respectively, the dimming device further comprises a signal conversion circuit, the output end of the signal conversion circuit is connected with the input end of the voltage detection circuit, the output end of the voltage detection circuit is connected with the input end of a signal feedback circuit, and the output end of the signal feedback circuit is connected with the input end of the driving isolation circuit.
2. The dimming control apparatus for led lighting products of claim 1, wherein: the voltage detection circuit comprises a chip U4, wherein a pin 1 and a pin 2 of the chip U4 are respectively connected with a resistor R56 and a resistor R55, the other end of the resistor R55 is an input end, a pin 3 of the chip U4 is connected with an S pole of a field-effect tube Q6, a G pole of the field-effect tube Q6 is connected with a signal conversion circuit, and a D pole of the field-effect tube Q6 is connected with a resistor R58.
3. The dimming control apparatus for led lighting products of claim 2, wherein: the voltage detection circuit further comprises a double operational amplifier U7-B, the other ends of a resistor R56 and a resistor R58 are respectively connected with a pin 5 of the double operational amplifier U7-B and a resistor R57, a pin 6 of the double operational amplifier U7-B is respectively connected with a resistor R52 and a capacitor C31, the other ends of a resistor R52 and a capacitor C31 are respectively connected with a pin 7 of the double operational amplifier U7-B and a resistor R53, the resistor R53 is respectively connected with a capacitor C23 and a resistor R54, and the other end of the resistor R54 is respectively connected with a diode D11 and a capacitor C24.
4. The dimming control apparatus for led lighting products of claim 1, wherein: the signal conversion circuit comprises a chip U5, wherein a pin 5 of the chip U5 is connected with a capacitor C25, a diode ZD3 and a diode D14 respectively, a pin 8 of the chip U5 is connected with a resistor R66 and a resistor R67 respectively, the other end of the diode D14 is connected with a resistor R62, the resistor R62 is connected with a pin 1 of an inductor L5, a pin 3 and a pin 4 of the inductor L5 are dimming signal input ends, the other end of the resistor R66 is connected with a collector of a triode Q9, and the other end of the resistor R67 is connected with a diode Z5 and a base of the triode Q9.
5. The dimming control device for led lighting products of claim 4, wherein: the signal conversion circuit further comprises a chip U8, an emitter of a triode Q9 is respectively connected with a capacitor C29 and a pin 1 of the chip U8, a pin 3 of the chip U8 is connected with a pin 6 of the chip U5, a pin 8 of a chip U8 is respectively connected with an emitter of a triode Q8 and the capacitor C41, a pin 6 of a chip U8 is connected with a voltage detection circuit, a base of the triode Q8 is respectively connected with a diode Z4 and a resistor R65, a collector of a triode Q8 is connected with a resistor R64, and the other end of the resistor R64 is connected with the other end of the resistor R65.
6. The dimming control apparatus for led lighting products of claim 1, wherein: the signal feedback circuit comprises a chip U3, a pin 1 of the chip U3 is connected with a resistor R46 and a resistor R45, a pin 2 of the chip U3 and the other end of a resistor R46 are connected with a diode D12, the other end of the diode D12 is connected with a voltage detection circuit, and a pin 4 of the chip U3 is connected with a driving isolation circuit.
7. The dimming control apparatus for led lighting products of claim 1, wherein: the dimming device further comprises a pulse generating circuit, and the output end of the pulse generating circuit is connected with the input end of the voltage detection circuit.
8. The dimming control apparatus for led lighting products of claim 7, wherein: the pulse generating circuit comprises a field effect transistor Q7, a G pole of a field effect transistor Q7 is connected with a diode Z6, a resistor R59 and a capacitor C32, a D pole of a field effect transistor Q7 is connected with a resistor R68, a resistor R69 and a capacitor C36, and the other end of a resistor R68 is connected with a voltage detection circuit.
9. The dimming control apparatus for led lighting products of claim 1, wherein: the output end of the driving isolation circuit is connected with an output filter circuit, the output filter circuit comprises a triode Q5, a collector of a triode Q5 is respectively connected with the driving isolation circuit and a resistor R44, a base of the triode Q5 is respectively connected with the other end of a resistor R44 and a diode Z2, the other end of a diode Z2 is connected with a capacitor C20, and an emitter of the triode Q5 is respectively connected with a capacitor C20 and a voltage detection circuit.
10. The method for implementing the dimming control device of the led lighting product as claimed in any one of claims 1 to 9, comprising the steps of:
the alternating current-direct current conversion circuit converts alternating current into direct current to be output to the driving isolation circuit, and the driving isolation circuit outputs voltage to the output filter circuit;
secondly, the voltage detection circuit samples the output voltage of the output filter circuit, compares the output voltage with the reference voltage generated by the chip U4 to obtain a feedback signal, and transmits the feedback signal to the drive isolation circuit through the signal feedback circuit to adjust the voltage stability and consistency;
after the lighting device is powered on, the pulse generating circuit generates a pulse high-voltage signal and outputs the pulse high-voltage signal to the voltage detection circuit, the pulse high-voltage signal is used as a supplementary signal of a reference voltage signal, the pulse high-voltage signal and the reference voltage are synthesized into a voltage with a pulse waveform, the voltage is transmitted to the driving isolation circuit through the signal feedback circuit, and a short-time high-pulse output voltage is provided to start the lighting device;
and when the signal conversion circuit receives the dimming signal, the dimming signal is converted into a PWM pulse width signal and is output to the voltage detection circuit, the voltage detection circuit synthesizes the PWM pulse width signal into a direct current control signal and transmits the direct current control signal to the drive isolation circuit through the signal feedback circuit, and the direct current voltage signal is output through the output filter circuit to carry out dimming control on the lighting device.
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