CN116963350A - High-precision self-adaptive adjusting method of LED dimming power supply based on high-frequency PWM - Google Patents
High-precision self-adaptive adjusting method of LED dimming power supply based on high-frequency PWM Download PDFInfo
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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]
- H05B45/10—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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Abstract
The invention provides a high-precision self-adaptive adjustment method of an LED dimming power supply based on high-frequency PWM, which is used for realizing high-precision self-adaptive adjustment of the luminous brightness of an LED device based on an adjustment circuit and comprises the following steps of S1: acquiring the corresponding relation between the duty ratio and the brightness level and setting a reference duty ratio; s2: the reference duty ratio corresponding to the brightness level is called and a high-frequency PWM signal corresponding to the brightness level is output to drive the LED device; s3: performing pulse width time comparison on the detection duty cycle and the reference duty cycle; s4: when the difference value of the pulse width time exceeds the allowable error range, the increment of the duty ratio of the output high-frequency PWM signal is equal to the difference value, and the step S3 is repeated; s5: when the difference in pulse width time is within the allowable error range, the duty ratio of the output high-frequency PWM signal is kept unchanged, and step S3 is repeated. According to the invention, the output high-frequency PWM signal increment is set as the difference value between the reference duty ratio and the feedback duty ratio detected in real time, so that the effects of no stroboscopic, no noise and self-adaptive dimming in real time are achieved.
Description
Technical Field
The invention relates to the technical field of LED dimming power supplies, in particular to a high-precision self-adaptive adjusting method of an LED dimming power supply based on high-frequency PWM.
Background
The dimming modes of the LED dimming power supply widely applied in the prior art are two main types, namely a voltage-dimming mode and a Pulse Width (PWM) mode, dimming in the voltage-dimming mode is smooth, no stroboscopic effect and no noise are generated, but when the lamp with color temperature is used, the brightness of a certain color cannot be independently regulated, so that the Pulse Width (PWM) mode capable of independently regulating the brightness of a certain color is needed, but the low-frequency Pulse Width (PWM) can generate stroboscopic effect, so that people feel headache, eye fatigue and physical and mental fatigue. Increasing the Pulse Width (PWM) to a frequency above 3.125KHZ allows for high frequency immunity, but also produces noise while dimming. The Pulse Width (PWM) must be further increased to 20K to dim the frequency to eliminate the noise caused by the Pulse Width (PWM). However, when the dimming duty ratio is relatively low, the dimming duty ratio gradually decays after passing through the logic circuit or the driving circuit, so that the waveform of the driving lamp is distorted, and the lamp is turned off.
In addition, in the process of debugging the brightness of the LED dimming power supply, the brightness is required to be manually and sequentially debugged according to each brightness gear, one gear is adjusted to measure the brightness once, and whether the preset brightness is reached or not is judged, so that the dimming debugging of an LED device can be completed only through multiple times of adjustment and testing, the labor cost is high, the efficiency is low, the large-scale production and processing are not facilitated, the expected precision of manual debugging cannot be achieved, and the requirement of high-precision dimming equipment cannot be met.
In addition, because of performance difference of different batches of devices, when each batch of power supplies are dimmed to the lowest brightness, the lamps are turned off due to the difference, and the LED device is unstable in light-emitting brightness and is bright and dark due to the performance problem of the devices.
Therefore, a high-precision self-adaptive adjusting method of an LED dimming power supply based on high-frequency PWM is urgently needed, and self-adaptive dimming without stroboscopic and noise and manual debugging is realized.
Disclosure of Invention
The high-precision self-adaptive adjusting method of the LED dimming power supply based on the high-frequency PWM is mainly used for solving the problems of stroboscopic effect, noise, unstable luminous brightness, low factory debugging efficiency and the like of the traditional PWM dimming, so that the effects of no stroboscopic effect, no noise, ensured luminous brightness stability and self-adaptive dimming without manual debugging are achieved.
The invention realizes the above purpose through the following technical scheme:
the high-precision self-adaptive regulation method of the LED dimming power supply based on high-frequency PWM, the regulation circuit of the LED dimming power supply comprises a power supply main circuit, a control switch, a dimming signal processing circuit for outputting a dimming control signal, a driving circuit, a detection circuit and a singlechip circuit provided with a PWM control module, a PWM signal generation module and a deviation correction module, the method realizes high-precision self-adaptive regulation of the luminous brightness of an LED device based on the regulation circuit of the LED dimming power supply and comprises the following steps:
s1: and acquiring the corresponding relation between the duty ratio of the high-frequency PWM and the luminous brightness of the LED device, and respectively setting the reference duty ratio of the corresponding brightness level in the singlechip circuit.
S2: and according to the dimming control signal, a reference duty ratio corresponding to the brightness level is called, the duty ratio output by the PWM control module is set after comparison and judgment, and a high-frequency PWM signal corresponding to the brightness level is generated by the PWM signal generation module according to the output duty ratio to drive the LED device.
S3: the detection circuit feeds back a power-on state signal of the LED device, and the deviation correction module performs pulse width time comparison on the duty ratio of the power-on state signal and the reference duty ratio.
S4: when the difference in the pulse width time exceeds the allowable error range, the increment of the duty ratio of the outputted high-frequency PWM signal is equal to the difference, and step S3 is repeated.
S5: when the difference in the pulse width time is within the allowable error range, the duty ratio of the outputted high frequency PWM signal is maintained unchanged, and step S3 is repeated.
In a further scheme, in step S1, a relation between a light-emitting brightness level and a duty ratio is obtained through testing to obtain a relation curve between luminous flux and the duty ratio, a plurality of corresponding sampling points are respectively obtained on the relation curve according to the light-emitting brightness level of the LED device, a reference duty ratio, an allowable error range and a brightness level allowable range corresponding to the light-emitting brightness level of the LED device are obtained, and data are input into the singlechip circuit.
The further scheme is that the singlechip circuit adopts a singlechip STM32G030F6P6, the crystal oscillator frequency is 64MHz, and the frequency of the high-frequency PWM output by the singlechip circuit is 20KHz.
The further scheme is that the duty ratio corresponding to the lowest brightness level in the brightness levels is 0.2%, namely the duty ratio of the high-frequency PWM is 100ns, the allowable error range is 100ns plus or minus 20ns, and the allowable range of the brightness levels is 50 ns-250 ns.
In a further scheme, in step S2, the duty ratio output by the PWM control module is set to be the ratio of the PWM comparison register value set by the singlechip to the PWM period register value, and the PWM comparison register value is changed according to the dimming control signal to change the duty ratio of the corresponding brightness level output by the PWM control module.
Further, the step S2 specifically includes the following steps:
s21: the dimming system sends out a dimming instruction, and outputs the dimming control signal to the singlechip circuit after being processed by the dimming signal processing circuit;
s22: the driving circuit is connected with the high-frequency PWM signal, amplifies the high-frequency PWM signal and drives the control switch, and the control switch is conducted to enable the dimming power supply input end of the LED device to be connected with the power supply main circuit for power-on.
When the duty ratio of the power-on state signal is smaller than 80ns, the high-frequency PWM signal input to the input end of the dimming power supply of the LED device is attenuated, and the high-frequency PWM signal stabilizes the luminous brightness of the LED device by increasing the duty ratio equal to the attenuation value.
Further, when the duty ratio of the power-on state signal is greater than 120ns, the high-frequency PWM signal input to the dimming power supply input end of the LED device is increased due to device performance, and the high-frequency PWM signal stabilizes the light-emitting brightness of the LED device by decreasing the duty ratio equal to the increased value.
When the difference value of the pulse width time exceeds the allowable error range and the duty ratio of the high-frequency PWM exceeds the allowable brightness level range, the singlechip circuit stops adjusting the duty ratio of the high-frequency PWM and sends a fault alarm signal to a dimming system through the dimming signal processing circuit.
It can be seen that the invention has the following beneficial effects:
1. the invention detects the signal duty ratio of the dimming power supply input end of the LED device in real time, compares the signal duty ratio with the reference duty ratio set by the singlechip, sets the difference value of the signal duty ratio as the increment of the output high-frequency PWM duty ratio, forms closed-loop feedback control, realizes the self-adaptive adjustment of the luminous brightness of the LED device, does not need manual intervention, reduces the cost, improves the production efficiency and greatly improves the debugging accuracy;
2. according to the invention, the singlechip is controlled to output a high-frequency PWM signal of 20KHz to achieve high-frequency exemption, so that visual fatigue caused by stroboscopic LED lamps due to dimming by adopting the PWM signal and noise generated during dimming are avoided;
3. the invention takes the signal duty ratio of the input end of the dimming power supply of the LED device as feedback quantity to adjust the duty ratio of the high-frequency PWM output by the singlechip, thereby avoiding the problems of the performance of the dimming device and waveform distortion caused by PWM signal fluctuation caused by electromagnetic interference, and avoiding the problems of light attenuation or extinction caused by attenuation of the signal in the circuit transmission process when the brightness is low.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a flowchart of a high-precision adaptive adjustment method of an LED dimming power supply based on high-frequency PWM.
Fig. 2 is a schematic diagram of a regulating circuit of the LED dimming power supply of the present invention.
Fig. 3 is a schematic diagram of a second embodiment of the adjusting circuit of the LED dimming power supply of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
High-precision self-adaptive adjusting method embodiment of LED dimming power supply based on high-frequency PWM
Referring to fig. 1, the high-precision adaptive adjustment method of an LED dimming power supply based on high-frequency PWM according to the present invention includes a power supply main circuit 10, a control switch Q1, a dimming signal processing circuit 20 outputting a dimming control signal, a driving circuit 40, a detecting circuit 50, and a single chip circuit 30 provided with a PWM control module, a PWM signal generating module, and a deviation correcting module, where the method implements high-precision adaptive adjustment of the light emitting brightness of an LED device based on the adjustment circuit of the LED dimming power supply, and includes:
s1: the corresponding relation between the duty ratio of the high-frequency PWM and the luminous brightness of the LED device is obtained, and the reference duty ratio of the corresponding brightness level is respectively set in the singlechip circuit 30.
S2: and according to the dimming control signal, a reference duty ratio corresponding to the brightness level is called, the duty ratio output by the PWM control module is set after comparison and judgment, and a high-frequency PWM signal corresponding to the brightness level is generated by the PWM signal generation module according to the output duty ratio to drive the LED device.
S3: the detection circuit 50 feeds back a power-on state signal of the LED device, and the deviation correction module performs pulse width time comparison between the duty cycle of the power-on state signal and a reference duty cycle.
S4: when the difference in the pulse width time exceeds the allowable error range, the increment of the duty ratio of the outputted high-frequency PWM signal is equal to the difference, and step S3 is repeated.
S5: when the difference in the pulse width time is within the allowable error range, the duty ratio of the outputted high frequency PWM signal is maintained unchanged, and step S3 is repeated.
Referring to fig. 2-3, specifically, in the adjusting circuit of the LED dimming power supply of this embodiment, the power supply main circuit 10 is connected to a power supply, converts a power supply voltage into an LED dimming voltage, an output end of the power supply main circuit 10 is connected to a dimming power supply input end of an LED device through the control switch Q1, the dimming signal processing circuit 20 receives a dimming command sent by a dimming system, outputs a dimming control signal to the singlechip circuit 30 according to the dimming command, the singlechip circuit 30 outputs a high-frequency PWM signal to the driving circuit 40, the driving circuit 40 is used for amplifying the high-frequency PWM signal, so that the control switch Q1 is driven to be turned on in a power-on time according to a duty ratio of the high-frequency PWM signal, and the detecting circuit 50 is used for feeding back a power-on state signal of the LED device to the singlechip circuit 30.
Fig. 2 is a schematic diagram of the feedback signal sampling point of the detection circuit 50 at the driving end of the control switch Q1, and fig. 3 is a schematic diagram of the feedback signal sampling point of the detection circuit 50 at the dimming power input end of the LED device.
In this embodiment, in step S1, a relationship between a light-emitting brightness level and a duty cycle is obtained through testing to obtain a relationship curve between luminous flux and a duty cycle, and a plurality of corresponding sampling points are respectively obtained on the relationship curve according to the light-emitting brightness level of the LED device, so as to obtain a reference duty cycle, an allowable error range and a brightness level allowable range corresponding to the light-emitting brightness level of the LED device, and data is input into the singlechip circuit 30.
Specifically, the luminous flux in this embodiment is the sum of the amounts of light emitted by the LED devices per second, and the higher the brightness level, the higher the luminous flux.
In this embodiment, the singlechip circuit 30 adopts the singlechip STM32G030F6P6, the crystal oscillator frequency is 64MHz, and the frequency of the high-frequency PWM output by the singlechip circuit is 20KHz.
In this embodiment, the duty ratio corresponding to the lowest brightness level of the brightness levels is 0.2%, that is, the duty ratio of the high-frequency PWM is 100ns, the allowable error range is 100ns±20ns, and the allowable range of the brightness levels is 50ns to 250ns.
Specifically, in the embodiment, the duty ratio corresponding to the lowest brightness level can be further reduced by using the singlechip with higher precision, so that the adjusting precision and speed are improved.
In this embodiment, in step S2, the duty ratio output by the PWM control module is set to be the ratio of the PWM comparison register value set by the single-chip microcomputer to the PWM period register value, and the PWM comparison register value is changed according to the dimming control signal to change the duty ratio of the corresponding brightness level output by the PWM control module.
In this embodiment, the step S2 specifically includes the following steps:
s21: the dimming system sends out a dimming command, and outputs the dimming control signal to the singlechip circuit 30 after processing the dimming command by the dimming signal processing circuit 20.
S22: the driving circuit 40 is connected to the high-frequency PWM signal, amplifies the high-frequency PWM signal, and drives the control switch Q1, and the control is conducted to enable the dimming power supply input end of the LED device to be connected to the power supply main circuit 10 for power-on.
Specifically, in this embodiment, a delay module is disposed at the input end of the offset correction module, so that the detected duty cycle is delayed and input to simulate the transfer time of the driving circuit 40 and the control switch Q1 and the response time of the LED device.
In this embodiment, when the duty ratio of the power-on state signal is less than 80ns, it indicates that the high-frequency PWM signal input to the dimming power supply input terminal of the LED device is attenuated, and the high-frequency PWM signal stabilizes the light-emitting brightness of the LED device by increasing the duty ratio equal to the attenuation value.
In this embodiment, when the duty ratio of the power-on state signal is greater than 120ns, it indicates that the high-frequency PWM signal input to the dimming power supply input terminal of the LED device increases due to device performance, and the high-frequency PWM signal stabilizes the light emission luminance of the LED device by decreasing the duty ratio equal to the increase value.
In the present embodiment, S41: when the difference of the pulse width time exceeds the allowable error range and the duty ratio of the high-frequency PWM exceeds the allowable range of the brightness level at this time, the single-chip microcomputer circuit 30 stops adjusting the duty ratio of the high-frequency PWM and sends a malfunction alerting signal to the dimming system through the dimming signal processing circuit 20.
Specifically, in this embodiment, when the duty ratio of the high-frequency PWM is lower than 50ns or higher than 250ns, the circuit is regarded as a fault, and an alarm is given.
Specifically, in this embodiment S42: when the fault is relieved and the power supply is powered on again, the singlechip circuit 30 automatically resets, resets the previous duty ratio to the initial duty ratio value, and repeats the steps S1 to S5.
Specifically, taking an embodiment as an example, the duty ratio PWM signal detected by the singlechip circuit 30 is compared with the PWM signal with the reference duty ratio set therein in pulse width time, the detected duty ratio PWM signal has a pulse width time of about 60ns, which is 40ns less than the PWM pulse width time with the reference duty ratio set therein of 0.2% (100 ns), and the singlechip circuit 30 increases 20ns each time on the basis of the PWM signal with the reference duty ratio. When the duty cycle time of the PWM signal is increased to about 140ns and the pulse width time of the duty cycle PWM signal detected by the singlechip circuit 30 is within 100ns (+ -20 ns), the singlechip circuit 30 stops increasing the duty cycle, and the lamp is driven by the increased duty cycle PWM signal, so that the LED lamp can not be extinguished under the condition of lowest brightness when the system dimming is ensured. And the consistency of the brightness of the LED power supply is ensured. The data of the embodiment are only obtained by testing a singlechip with the model of STM32G030F6P6, and if the singlechip is replaced by other singlechips with better performance, better data can be obtained.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (9)
1. The high-precision self-adaptive adjusting method of the LED dimming power supply based on the high-frequency PWM is characterized in that an adjusting circuit of the LED dimming power supply comprises a power supply main circuit, a control switch, a dimming signal processing circuit outputting a dimming control signal, a driving circuit, a detection circuit and a singlechip circuit provided with a PWM control module, a PWM signal generation module and a deviation correction module, and the method is used for realizing high-precision self-adaptive adjustment of the luminous brightness of an LED device based on the adjusting circuit of the LED dimming power supply and comprises the following steps:
s1: acquiring the corresponding relation between the duty ratio of the high-frequency PWM and the luminous brightness of the LED device, and respectively setting the reference duty ratio of the corresponding brightness level in the singlechip circuit;
s2: the reference duty ratio of the corresponding brightness level is adjusted according to the dimming control signal, the duty ratio output by the PWM control module is set after comparison and judgment, and the high-frequency PWM signal of the corresponding brightness level is generated by the PWM signal generation module according to the output duty ratio to drive the LED device;
s3: the detection circuit feeds back a power-on state signal of the LED device, and the deviation correction module performs pulse width time comparison on the duty ratio of the power-on state signal and a reference duty ratio;
s4: when the difference value of the pulse width time exceeds the allowable error range, the increment of the duty ratio of the output high-frequency PWM signal is equal to the difference value, and the step S3 is repeated;
s5: when the difference in the pulse width time is within the allowable error range, the duty ratio of the outputted high frequency PWM signal is maintained unchanged, and step S3 is repeated.
2. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 1, wherein:
in step S1, a relation between a light-emitting brightness level and a duty cycle is obtained through testing to obtain a relation curve between luminous flux and a duty cycle, a plurality of corresponding sampling points are respectively obtained on the relation curve according to the light-emitting brightness level of the LED device, a reference duty cycle, an allowable error range and a brightness level allowable range corresponding to the light-emitting brightness level of the LED device are obtained, and data are input into the singlechip circuit.
3. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 2, wherein:
the singlechip circuit adopts a singlechip STM32G030F6P6, the crystal oscillator frequency is 64MHz, and the frequency of the high-frequency PWM output by the singlechip circuit is 20KHz.
4. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 3, wherein:
the duty ratio corresponding to the lowest brightness level in the brightness levels is 0.2%, namely the duty ratio of the high-frequency PWM is 100ns, the allowable error range is 100ns plus or minus 20ns, and the allowable range of the brightness levels is 50 ns-250 ns.
5. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 1, wherein:
in step S2, the duty ratio output by the PWM control module is set to be the ratio of the PWM comparison register value set by the singlechip to the PWM period register value, and the PWM comparison register value is changed according to the dimming control signal to change the duty ratio of the corresponding brightness level output by the PWM control module.
6. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 5, wherein the step S2 specifically comprises the following steps:
s21: the dimming system sends out a dimming instruction, and outputs the dimming control signal to the singlechip circuit after being processed by the dimming signal processing circuit;
s22: the driving circuit is connected with the high-frequency PWM signal, amplifies the high-frequency PWM signal and drives the control switch, and the control switch is conducted to enable the dimming power supply input end of the LED device to be connected with the power supply main circuit for power-on.
7. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to any one of claim 4, wherein:
when the duty ratio of the power-on state signal is smaller than 80ns, the high-frequency PWM signal input to the dimming power supply input end of the LED device is represented to be attenuated, and the high-frequency PWM signal stabilizes the luminous brightness of the LED device by increasing the duty ratio equal to the attenuation value.
8. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to any one of claim 7, wherein:
when the duty ratio of the power-on state signal is greater than 120ns, it indicates that the high-frequency PWM signal input to the dimming power supply input terminal of the LED device increases due to device performance, and the high-frequency PWM signal stabilizes the light emitting brightness of the LED device by decreasing the duty ratio equal to the increase value.
9. The high-precision adaptive adjustment method for the high-frequency PWM-based LED dimming power supply according to claim 1, wherein:
when the difference value of the pulse width time exceeds the allowable error range and the duty ratio of the high-frequency PWM exceeds the allowable brightness level range, the singlechip circuit stops adjusting the duty ratio of the high-frequency PWM and sends a fault alarm signal to a dimming system through the dimming signal processing circuit.
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| CN117939745A (en) * | 2024-03-20 | 2024-04-26 | 珠海市圣昌电子有限公司 | High-precision load limiting control circuit and load limiting control method based on load derating curve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117939745A (en) * | 2024-03-20 | 2024-04-26 | 珠海市圣昌电子有限公司 | High-precision load limiting control circuit and load limiting control method based on load derating curve |
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