CN109275229B - Dimming circuit for detecting alternating current power supply waveform and dimming method thereof - Google Patents
Dimming circuit for detecting alternating current power supply waveform and dimming method thereof Download PDFInfo
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- CN109275229B CN109275229B CN201811227830.2A CN201811227830A CN109275229B CN 109275229 B CN109275229 B CN 109275229B CN 201811227830 A CN201811227830 A CN 201811227830A CN 109275229 B CN109275229 B CN 109275229B
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Classifications
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a dimming circuit for detecting alternating current power supply waveforms, which comprises a knob switch K1, an LED driver, a light source LED, a power supply module AC-DC, an optocoupler U1 and a control unit MCU, wherein the LED driver is respectively connected with alternating current and the light source LED; the invention also discloses a dimming method of the dimming circuit for detecting the alternating current power supply waveform. The invention carries out dimming by detecting the input waveform of alternating current, and has the advantages of more dimming stages, convenient operation and the like compared with the traditional segment dimming.
Description
Technical Field
The invention belongs to the technical field of LED driving, and particularly relates to a dimming circuit for detecting an alternating current power supply waveform and a dimming method thereof.
Background
The current market post-load market mainly uses section dimming, the supported gear is limited, and the mode can only be switched among a plurality of fixed gears, so that electrodeless dimming can not be realized, and the use of the dimming lamp is limited to a certain extent. The following disadvantages exist: 1. the adjustable light gear is fixed and limited; 2. the dimming mode is not concise.
Disclosure of Invention
The present invention is directed to a dimming circuit for detecting an ac power waveform, so as to solve the problems set forth in the background art. The dimming circuit for detecting the alternating current power supply waveform has the characteristics of multiple dimming stages and convenience in operation.
Another object of the present invention is to provide a dimming method of a dimming circuit for detecting an ac power waveform.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a detect dimming circuit of alternating current power supply waveform, including knob switch K1, the LED driver, light source LED, power module AC-DC, opto-coupler U1 and control unit MCU, alternating current and light source LED are connected respectively to the LED driver, be connected with knob switch K1 between LED driver and the alternating current AC-L, power module AC-DC connects alternating current and control unit MCU respectively, opto-coupler U1 is connected with the alternating current through bleeder circuit, opto-coupler U1 still is connected with control unit MCU, control unit MCU is connected with the LED driver.
In the invention, the knob switch K1 comprises three gears of a first gear, a second gear and a third gear, wherein the first gear is empty, the second gear is connected with the alternating current AC-L through the rectifier diode D1, the third gear is directly connected with the alternating current AC-L, the knob switch K1 is respectively connected with the AC end of the LED driver, the AC end of the power supply module AC-DC and the voltage dividing circuit, and the waveform of the alternating current input is adjusted by matching the knob switch K1 with the rectifier diode D1.
In the invention, the voltage dividing circuit comprises a diode D2, a resistor R3 and a resistor R4, and the diode D2, the resistor R3 and the resistor R4 are sequentially connected in series, wherein the diode D2 is connected with the alternating current AC-N, the resistor R4 is connected with the knob switch K1, and the cut-off or the conduction of the optocoupler U1 is regulated by utilizing the characteristic that the diode D2 is conducted in the negative half cycle of the alternating current.
In the invention, the input end of the optocoupler U1 is connected in parallel with the two ends of the resistor R4, one output end of the optocoupler U1 is connected with the IO end of the control unit MCU and is also connected with the VCC end of the control unit MCU through the resistor R2, the other output end of the optocoupler U1 is connected with the GND end, and the level of the connection point between the resistor R2 and the MCU-IO end is regulated through the cut-off or the conduction of the optocoupler U1.
In the invention, the other AC end of the power supply module AC-DC is connected with alternating current AC-N, the GND end of the power supply module AC-DC is connected with the GND end of the control unit MCU, and the VCC end of the power supply module AC-DC is connected with the VCC end of the control unit MCU.
In the invention, the other AC end of the LED driver is connected with alternating current AC-N, the output end of the LED driver is connected with the light source LED, and the PWM end of the LED driver is connected with the PWM end of the control unit MCU.
In the invention, the light source LED comprises an LED1, an LED2 and an LED3, the LED1, the LED2 and the LED3 are mutually connected in series, the LED1 is connected with the LED+ end of the LED driver, and the LED3 is connected with the LED-end of the LED driver.
In the invention, the dimming method of the dimming circuit for detecting the alternating current power supply waveform comprises the following steps:
firstly, directly connecting alternating current AC-L to a three-gear contact piece of a knob switch K1, connecting the alternating current AC-L to a two-gear contact piece of the knob switch K1 through a rectifier diode D1, and enabling a first-gear contact piece of the knob switch K1 to be empty;
when the knob switch K1 rotates from first gear to second gear, alternating current AC-L supplies power to the LED driver and the power supply module AC-DC through the rectifier diode D1, and the control unit MCU works and outputs a dimming signal with 100% brightness;
thirdly, the alternating current is shaped into half-wave input through a rectifier diode D1, namely, the input alternating current only has positive half-cycle waveform, and a diode D2 is conducted in the negative half-cycle of the alternating current, so that the optocoupler U1 is in a cut-off state, and the level of a connection point between a resistor R2 and the MCU-IO end of the control unit is high;
fourthly, if the level detected by the MCU-IO end of the control unit is high level, judging that the knob switch K1 is in second gear, enabling the control unit MCU to enter gradual dimming, and wirelessly cycling the mode from the brightest mode to the darkest mode and the darkest mode to the brightest mode, wherein the brightness of the light source LED is 100% -10% -100%;
and fifthly, when the brightness of the light source LED is changed to the brightness desired by a user, the knob switch K1 can be switched to three gears, the three gears are directly connected with the alternating current AC-L, the power supply alternating current waveform is full wave, when the alternating current is in the negative half cycle, the optical coupler U1 is conducted, the level of the connection point between the resistor R2 and the MCU-IO end of the control unit is changed from high level to low level, the dimming gradual change action can be immediately stopped after the control unit MCU detects the change of the level, the brightness of the light source LED is maintained at the brightness when the knob switch K1 is switched to the three gears from the second gear, and the purpose of stepless dimming is achieved.
In the invention, when the voltage at two ends of the resistor R4 is larger than the on voltage of the optocoupler U1, the optocoupler U1 is turned on, and the level of the connection point between the resistor R2 and the MCU-IO end of the control unit is changed into a low level.
In the invention, the knob switch K1 comprises three gears of a first gear, a second gear and a third gear, wherein the first gear is empty, the second gear is connected with the alternating current AC-L through the rectifier diode D1, the third gear is directly connected with the alternating current AC-L, and the knob switch K1 is respectively connected with the AC end of the LED driver, the AC end of the power supply module AC-DC and the voltage dividing circuit; the voltage dividing circuit comprises a diode D2, a resistor R3 and a resistor R4, and the diode D2, the resistor R3 and the resistor R4 are sequentially connected in series, wherein the diode D2 is connected with alternating current AC-N, and the resistor R4 is connected with a knob switch K1; the input end of the optical coupler U1 is connected in parallel with the two ends of the resistor R4, one output end of the optical coupler U1 is connected with the IO end of the control unit MCU and is also connected with the VCC end of the control unit MCU through the resistor R2, and the other output end of the optical coupler U1 is connected with the GND end; the other AC end of the power supply module AC-DC is connected with alternating current AC-N, the GND end of the power supply module AC-DC is connected with the GND end of the control unit MCU, and the VCC end of the power supply module AC-DC is connected with the VCC end of the control unit MCU; the other AC end of the LED driver is connected with alternating current (AC-N), the output end of the LED driver is connected with a light source LED, and the PWM end of the LED driver is connected with the PWM end of the control unit MCU; the light source LED comprises an LED1, an LED2 and an LED3, the LED1, the LED2 and the LED3 are mutually connected in series, the LED1 is connected with the LED+ end of the LED driver, and the LED3 is connected with the LED-end of the LED driver.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention carries out dimming by detecting the input waveform of alternating current, has more dimming stages compared with the traditional segment dimming, has simple operation and is convenient for the old and children to use;
2. compared with other wireless dimming panels, the invention does not need zero-live wire power supply or complex single-live wire power supply, and has no conditional limit on the aftermarket replacement;
3. from the design of the lamp power supply, the invention can meet the requirements by using the most common singlechip, and the scheme of section dimming is not needed, so that the low-power consumption singlechip with high price is not needed.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a partial circuit diagram of the rotary switch K1 of the present invention when the second gear is turned on;
FIG. 3 is a partial circuit diagram of the rotary switch K1 of the present invention when three gears are turned on;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-3, the present invention provides the following technical solutions: the utility model provides a detect dimming circuit of alternating current power supply waveform, including knob switch K1, the LED driver, light source LED, power module AC-DC, opto-coupler U1 and control unit MCU, alternating current and light source LED are connected respectively to the LED driver, be connected with knob switch K1 between LED driver and the alternating current AC-L, power module AC-DC connects alternating current and control unit MCU respectively, opto-coupler U1 is connected with the alternating current through bleeder circuit, opto-coupler U1 still is connected with control unit MCU, control unit MCU is connected with the LED driver.
Further, the knob switch K1 comprises a first gear, a second gear and a third gear, wherein the first gear is empty, the second gear is connected with the alternating current AC-L through the rectifier diode D1, the third gear is directly connected with the alternating current AC-L, and the knob switch K1 is respectively connected with the AC end of the LED driver, the AC end of the power supply module AC-DC and the voltage dividing circuit.
Further, the voltage dividing circuit comprises a diode D2, a resistor R3 and a resistor R4, and the diode D2, the resistor R3 and the resistor R4 are sequentially connected in series, wherein the diode D2 is connected with alternating current AC-N, and the resistor R4 is connected with a knob switch K1.
Further, the input end of the optocoupler U1 is connected in parallel with two ends of the resistor R4, one output end of the optocoupler U1 is connected with the IO end of the control unit MCU and is also connected with the VCC end of the control unit MCU through the resistor R2, and the other output end of the optocoupler U1 is connected with the GND end.
Further, the other AC end of the power supply module AC-DC is connected with alternating current AC-N, the GND end of the power supply module AC-DC is connected with the GND end of the control unit MCU, and the VCC end of the power supply module AC-DC is connected with the VCC end of the control unit MCU.
Further, the other AC end of the LED driver is connected with alternating current AC-N, the output end of the LED driver is connected with the light source LED, and the PWM end of the LED driver is connected with the PWM end of the control unit MCU.
Further, the light source LED comprises an LED1, an LED2 and an LED3, the LED1, the LED2 and the LED3 are mutually connected in series, the LED1 is connected with the LED+ end of the LED driver, and the LED3 is connected with the LED-end of the LED driver.
Further, the dimming method of the dimming circuit for detecting the ac power supply waveform of the present invention includes the following steps:
firstly, directly connecting alternating current AC-L to a three-gear contact piece of a knob switch K1, connecting the alternating current AC-L to a two-gear contact piece of the knob switch K1 through a rectifier diode D1, and enabling a first-gear contact piece of the knob switch K1 to be empty;
when the knob switch K1 rotates from first gear to second gear, alternating current AC-L supplies power to the LED driver and the power supply module AC-DC through the rectifier diode D1, and the control unit MCU works and outputs a dimming signal with 100% brightness;
thirdly, the alternating current is shaped into half-wave input through a rectifier diode D1, namely, the input alternating current only has positive half-cycle waveform, and a diode D2 is conducted in the negative half-cycle of the alternating current, so that the optocoupler U1 is in a cut-off state, and the level of a connection point between a resistor R2 and the MCU-IO end of the control unit is high;
fourthly, if the level detected by the MCU-IO end of the control unit is high level, judging that the knob switch K1 is in second gear, enabling the control unit MCU to enter gradual dimming, and wirelessly cycling the mode from the brightest mode to the darkest mode and the darkest mode to the brightest mode, wherein the brightness of the light source LED is 100% -10% -100%;
and fifthly, when the brightness of the light source LED is changed to the brightness desired by a user, the knob switch K1 can be switched to three gears, the three gears are directly connected with the alternating current AC-L, the power supply alternating current waveform is full wave, when the alternating current is in the negative half cycle, the optical coupler U1 is conducted, the level of the connection point between the resistor R2 and the MCU-IO end of the control unit is changed from high level to low level, the dimming gradual change action can be immediately stopped after the control unit MCU detects the change of the level, the brightness of the light source LED is maintained at the brightness when the knob switch K1 is switched to the three gears from the second gear, and the purpose of stepless dimming is achieved.
Further, when the voltage at two ends of the resistor R4 is larger than the on voltage of the optocoupler U1, the optocoupler U1 is turned on, and the level of the connection point between the resistor R2 and the MCU-IO end of the control unit is changed into a low level.
In the embodiment, the knob switch K1 is a three-gear knob switch sold by Wenzhou one-key company; the LED driver is KP114 sold by a must-be-technology manufacturer; LED1, LED2 and LED3 are all 9V/100mA sold by manufacturers of wood Lin Sen; rectifier diodes D1 and D2 are M7 sold by Changzhou Guangda electronic limited company manufacturers; the power supply module AC-DC is of model LS03-15B12SR2 sold by Jin Shengyang company; the control unit MCU is MC6956 sold by Shanghai Chengsu company; the resistor R2, the resistor R3 and the resistor R4 are all selected from a patch 1206 sold by a manufacturer in the high department of Fenghua, wherein the resistance value of the resistor R2 is 10KΩ, the resistance value of the resistor R3 is 220KΩ, and the resistance value of the resistor R4 is 20KΩ; the optocoupler U1 is sold by billions of lights in 817 mode.
According to the embodiment, the alternating current input waveform is adjusted through the knob switch K1 matched with the rectifier diode D1, the input waveform is detected and judged through the control unit MCU, so that control is performed, the purpose of stepless adjustment of the brightness of the light source LED is achieved, and the dimming device has the advantages of being multiple in dimming level number, convenient to operate and the like compared with the traditional sectional dimming.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A dimming method of a dimming circuit for detecting an ac power waveform, comprising the steps of:
firstly, directly connecting a live wire of alternating current to a three-gear contact piece of a knob switch K1, connecting the live wire to a two-gear contact piece of the knob switch K1 through a rectifier diode D1, and enabling a first-gear contact piece of the knob switch K1 to be empty;
when the knob switch K1 rotates from first gear to second gear, the live wire of alternating current supplies power to the LED driver and the power supply module AC-DC through the rectifier diode D1, and the control unit MCU works and outputs a dimming signal with 100% brightness;
thirdly, the alternating current is shaped into half-wave input through a rectifier diode D1, namely, the input alternating current only has positive half-cycle waveform, and a diode D2 is conducted in the negative half-cycle of the alternating current, so that an optocoupler U1 is in a cut-off state, and the level of a connection point between a resistor R2 and an IO end of a control unit MCU is high;
fourthly, if the level detected by the IO end of the control unit MCU is high, judging that the knob switch K1 is in a second gear, enabling the control unit MCU to enter gradual dimming, and wirelessly cycling the mode from the brightest mode to the darkest mode and the darkest mode from 100% -10% -100% of the brightness of the light source LED;
fifthly, when the brightness of the light source LED is changed to the brightness desired by a user, the knob switch K1 is switched to three gears, the three gears are directly connected with a live wire of alternating current, the alternating current waveform of power supply is full wave, when the alternating current is in a negative half cycle, the optical coupler U1 is conducted, the level of a connection point between the resistor R2 and the IO end of the control unit MCU is changed from high level to low level, the dimming and gradual change action is immediately stopped after the control unit MCU detects the change of the level, the brightness of the light source LED is maintained at the brightness when the knob switch K1 is switched to the three gears from the second gear, and the purpose of stepless dimming is achieved;
when the voltage at two ends of the resistor R4 is larger than the on voltage of the optocoupler U1, the optocoupler U1 is turned on, and the level of the connection point between the resistor R2 and the IO end of the control unit MCU is changed into a low level;
the knob switch K1 comprises a first gear, a second gear and a third gear, wherein the first gear is empty, the second gear is connected with a live wire of alternating current through a rectifier diode D1, the third gear is directly connected with the live wire of the alternating current, and the knob switch K1 is respectively connected with an AC end of the LED driver, an AC end of the power supply module AC-DC and a voltage dividing circuit; the voltage dividing circuit comprises a diode D2, a resistor R3 and a resistor R4, and the diode D2, the resistor R3 and the resistor R4 are sequentially connected in series, wherein the diode D2 is connected with a zero line of alternating current, and the resistor R4 is connected with a knob switch K1; the input end of the optical coupler U1 is connected in parallel with the two ends of the resistor R4, one output end of the optical coupler U1 is connected with the IO end of the control unit MCU and is also connected with the VCC end of the control unit MCU through the resistor R2, and the other output end of the optical coupler U1 is connected with the GND end; the other AC end of the power supply module AC-DC is connected with a zero line of alternating current, the GND end of the power supply module AC-DC is connected with the GND end of the control unit MCU, and the VCC end of the power supply module AC-DC is connected with the VCC end of the control unit MCU; the other AC end of the LED driver is connected with a zero line of alternating current, the output end of the LED driver is connected with a light source LED, and the PWM end of the LED driver is connected with the PWM end of the control unit MCU.
2. The dimming method of a dimming circuit for detecting an ac power waveform as recited in claim 1, wherein: the light source LED comprises an LED1, an LED2 and an LED3, the LED1, the LED2 and the LED3 are mutually connected in series, the LED1 is connected with the LED+ end of the LED driver, and the LED3 is connected with the LED-end of the LED driver.
3. The dimming circuit for detecting an AC power supply waveform used in the dimming method for a dimming circuit for detecting an AC power supply waveform according to claim 1, comprising a knob switch K1, an LED driver, a light source LED, a power supply module AC-DC, an optocoupler U1 and a control unit MCU, wherein: the LED driver is connected with alternating current and a light source LED respectively, a knob switch K1 is connected between the LED driver and a live wire of the alternating current, the power supply module AC-DC is connected with the alternating current and a control unit MCU respectively, the optocoupler U1 is connected with the alternating current through a voltage dividing circuit, the optocoupler U1 is also connected with the control unit MCU, and the control unit MCU is connected with the LED driver.
4. A dimming circuit for detecting an ac power waveform for use in a dimming method for a dimming circuit for detecting an ac power waveform as claimed in claim 3, wherein: the light source LED comprises an LED1, an LED2 and an LED3, the LED1, the LED2 and the LED3 are mutually connected in series, the positive electrode end of the LED1 is connected with the LED+ end of the LED driver, and the negative electrode end of the LED3 is connected with the LED-end of the LED driver.
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| CN201811227830.2A CN109275229B (en) | 2018-10-22 | 2018-10-22 | Dimming circuit for detecting alternating current power supply waveform and dimming method thereof |
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| CN201811227830.2A CN109275229B (en) | 2018-10-22 | 2018-10-22 | Dimming circuit for detecting alternating current power supply waveform and dimming method thereof |
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| CN109275229B true CN109275229B (en) | 2023-12-01 |
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| CN110881234B (en) * | 2019-12-25 | 2021-08-20 | 珠海市圣昌电子有限公司 | Method for realizing non-stroboscopic and non-noise PWM dimming |
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| CN109275229A (en) | 2019-01-25 |
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