Dimming control method and circuit

Abstract

The application discloses a dimming control method and circuit, which is used for controlling the output power of power supply circuits of a plurality of lamps, and the method comprises the following steps: acquiring an adjustment parameter; wherein the adjustment parameter comprises a dimming signal and / or a gear signal; calculating a control parameter according to the adjustment parameter; performing synchronous on-off processing on the control parameter to generate a control signal; and the application can make the lamps realize high-precision dimming within the rated power range of the lamps, solve the defects of the lamps that are turned off and turned on in sequence, and improve the user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a dimming control method and circuit. BACKGROUND

[0002] The dimming control circuits on the market are various, but most of them have few functions, and some lack power regulation function, so that the power supply circuit can only drive the lamps and lanterns that are adapted to its power; some dimming control circuits have poor dimming accuracy, which affects the user experience.

[0003] In addition, the use of a single dimming control circuit to drive multiple power supply circuits at the same time is becoming more and more widespread, but because the opening and closing conditions of different power supply circuits may be different, when all power supply circuits are controlled to be turned off or on at the same time by the dimming control circuit, the on-off states of some power supply circuits may be inconsistent, resulting in the lamps and lanterns being turned off or on in sequence, which reduces the user experience. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a dimming control method and circuit.

[0005] The technical solution adopted by the present application to solve the technical problem is: a dimming control method is constructed for controlling the output power of the power supply circuit of a plurality of lamps and lanterns, comprising:

[0006] obtaining an adjustment parameter; wherein the adjustment parameter includes a dimming signal and / or a gear signal;

[0007] calculating a control parameter according to the adjustment parameter;

[0008] synchronously turning on and off the control parameter to generate a control signal.

[0009] Preferably, the dimming signal is one of a voltage dimming signal, a PWM dimming signal and a resistance dimming signal.

[0010] Preferably, before the adjustment parameter is obtained, it further comprises:

[0011] The dimming signal in the dimming control circuit is converted into a voltage signal by a dimming signal detection circuit, and then the dimming signal in the adjustment parameter is obtained.

[0012] Preferably, the calculation of the control parameter according to the adjustment parameter comprises:

[0013] If the adjustment parameter does not include a gear signal, the control parameter is calculated according to the dimming signal;

[0014] If the adjustment parameter does not include the dimming signal, a percentage coefficient is determined according to the gear signal, and the control parameter is calculated according to the rated control parameter and the percentage coefficient;

[0015] If the adjustment parameter includes the dimming signal and the gear signal, the control parameter is calculated according to the dimming signal and the gear signal.

[0016] Preferably, the calculation of the control parameter according to the dimming signal and the gear signal comprises:

[0017] A percentage coefficient is determined according to the gear signal, and an initial control parameter is calculated according to the dimming signal; the initial control parameter is multiplied by the percentage coefficient to obtain the control parameter.

[0018] Preferably, the gear signal includes a gear analog signal and a gear level signal.

[0019] The determination of the percentage coefficient according to the gear signal comprises:

[0020] A gear value is determined according to the gear analog signal and the set gear data, and then a gear level is determined according to the gear level signal and the gear value, and the percentage coefficient is determined according to the set gear level data and the gear level; wherein the set gear data includes a plurality of gear set values and a threshold range corresponding to each gear set value; and the set gear level data includes a plurality of set levels and a set coefficient corresponding to each set level.

[0021] Preferably, the synchronization on-off processing of the control parameter comprises:

[0022] If the control parameter is less than a synchronization closing threshold, the control signal is set to a set closing parameter;

[0023] If the control parameter is not less than the synchronization closing threshold and less than a synchronization opening threshold, if the control parameter shows a decreasing trend, the control signal is set to a set opening parameter, and if the control parameter shows an increasing trend, the control signal is set to the set closing parameter;

[0024] If the control parameter is not less than the synchronization opening threshold, the control signal is set to the control parameter.

[0025] Preferably, the dimming control method further comprises:

[0026] An optical control signal is obtained through a photosensitive circuit;

[0027] It is judged whether to close the power supply circuit according to the optical control signal, and if so, a closing signal is generated to close the power supply circuit.

[0028] The application also discloses a dimming control circuit for controlling the output power of the power supply circuit of the lamps, comprising:

[0029] An adjustment parameter acquisition circuit is configured to generate an adjustment parameter, wherein the adjustment parameter comprises a dimming signal and / or a gear signal.

[0030] A processor is configured to calculate a control parameter according to the adjustment parameter, and to perform synchronous start-stop processing on the control parameter to generate a control signal.

[0031] Preferably, the dimming control circuit further comprises a dimming signal detection circuit and / or a driving circuit.

[0032] The dimming signal detection circuit is connected to the dimming signal input end of the processor, and is configured to convert the dimming signal and input the dimming signal into the processor, wherein the dimming signal is one of a voltage dimming signal, a PWM dimming signal and a resistance dimming signal.

[0033] The driving circuit is connected to the control signal output end of the processor, and is configured to convert the control signal into a driving signal to control the output parameter of the power supply circuit.

[0034] Preferably, the dimming control circuit further comprises:

[0035] A photosensitive circuit is connected to the processor, and is configured to generate a light control signal according to the ambient brightness.

[0036] The processor is further configured to generate a shutdown signal for shutting down the power supply circuit according to the light control signal, so as to shut down the power supply circuit.

[0037] The application has the following beneficial effects: the dimming control method is provided; by acquiring the adjustment parameter and calculating the control parameter according to the adjustment parameter, the lamps can realize high-precision dimming within the rated power range; then the control parameter is subjected to synchronous start-stop processing to generate the control signal, so as to control the output power of the power supply circuit of the lamps, and the defects of the lamps being turned off and turned on in sequence are solved, and the user experience is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] The application will be further described below with reference to the drawings and embodiments, wherein:

[0039] Figure 1 is a flowchart of the dimming control method in some embodiments of the application;

[0040] Figure 2 is a circuit structure diagram of the dimming signal detection circuit in some embodiments of the application;

[0041] Figure 3 is a flowchart of the synchronous on-off processing in some embodiments of the present application;

[0042] Figure 4 is a structural schematic diagram of the dimming control circuit in the first embodiment of the present application.

[0043] Figure 5 is a structural schematic diagram of the dimming control circuit in the second embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0045] It should be noted that the flowchart shown in the accompanying drawings is only illustrative, and does not necessarily include all the contents and operations / steps, nor does it necessarily execute in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so the actual execution order may be changed according to the actual situation.

[0046] The block diagram shown in the accompanying drawings is only a functional entity, which does not necessarily correspond to a physically independent entity. That is, these functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0047] Reference Figure 1 is a flowchart of the dimming control method provided by the embodiments of the present application. The dimming control method of this embodiment is applied to the processor of the dimming control circuit, for controlling the output power of the power supply circuit of a plurality of luminaires, thereby realizing the dimming function. The dimming control method comprises:

[0048] obtaining an adjustment parameter; wherein the adjustment parameter comprises a dimming signal and / or a gear signal; calculating a control parameter according to the adjustment parameter; performing synchronous on-off processing on the control parameter to generate a control signal.

[0049] In this embodiment, the control parameter can be calculated according to the composition of the adjustment parameter. For example, if the adjustment parameter does not include the dimming signal, the control parameter is calculated according to the gear signal; if the adjustment parameter includes the dimming signal and the gear signal, the control parameter is calculated according to the dimming signal and the gear signal.

[0050] The dimming signal is used to adjust the output power of the power supply circuit within the rated power range, so as to realize the dimming of the luminaires.

[0051] The gear signal is used to adjust the rated power of the power supply circuit to meet the rated power of the lamp. It should be noted that the rated power of the power supply circuit greater than the rated power of the lamp may cause the lamp to be damaged by overcurrent or overvoltage, that is, the gear signal and the dimming signal cooperate to ensure that the lamp realizes high-precision dimming within its rated power range.

[0052] The effect of the synchronous on-off processing is to limit the control parameters, so that the resulting control signal can realize the effect of simultaneously closing and opening each power supply circuit when controlling multiple power supply circuits at the same time, solving the defects of the lamp appearing in the order of turning off and turning on, and improving the user experience.

[0053] In a preferred embodiment, the dimming signal is one of a voltage dimming signal, a PWM dimming signal, and a resistance dimming signal.

[0054] Although the processor can directly collect the voltage dimming signal, the PWM dimming signal, and the resistance dimming signal through the IO port, due to the large difference in the nature of the voltage dimming signal, the PWM dimming signal, and the resistance dimming signal, the algorithm program will be relatively complex when calculating the control parameters according to the adjustment parameters. In order to simplify the algorithm program of the control parameters, and the maximum voltage value of the dimming signal may be greater than the maximum detectable voltage of the processor, causing the processor to be unable to directly collect the dimming signal.

[0055] Further, in a preferred embodiment, before obtaining the adjustment parameters, it further includes:

[0056] The dimming signal in the dimming control circuit is converted into a voltage signal by the dimming signal detection circuit, and then the dimming signal in the adjustment parameters is obtained. In this embodiment, the voltage dimming signal, the PWM dimming signal, and the resistance dimming signal are converted into voltage signals, which is conducive to the processor obtaining the dimming signal through a single IO port, and simplifying the algorithm program of the control parameters. As Figure 2 As shown in FIG. 31, the dimming signal detection circuit includes a conversion circuit 31. When the dimming signal is a voltage dimming signal, the conversion circuit 31 divides the voltage dimming signal, and then the processor collects the voltage dimming signal. Then, the control parameters are calculated according to the reduced voltage dimming signal.

[0057] Further, when the dimming signal is a PWM dimming signal, the PWM dimming signal can also be divided by the conversion circuit 31 to convert it into a voltage signal that meets the detection requirements of the IO port of the processor, to avoid abnormal collection by the processor.

[0058] As shown in FIG. 32, the dimming signal detection circuit includes a conversion circuit 32. When the dimming signal is a resistance dimming signal, the conversion circuit 32 converts the resistance dimming signal into a voltage signal that meets the detection requirements of the IO port of the processor, to avoid abnormal collection by the processor. Figure 2As shown, the dimming signal detection circuit also includes a constant current circuit 32. When the dimming signal is a resistive dimming signal, a constant current signal is output by the constant current circuit 32. When this constant current signal flows through the resistor, adjustable resistor, or combination of resistive devices that outputs the resistive dimming signal, it generates a voltage signal with a function similar to that of a voltage dimming signal. The control parameter is then calculated based on the voltage signal after voltage division by the conversion circuit 31. It should be noted that in this embodiment, the constant current signal output by the constant current circuit 32 is at least one order of magnitude lower than the current of the PWM dimming signal or the voltage dimming signal. If the current of the PWM dimming signal or the voltage dimming signal is in the milliampere level, the constant current signal is in the microampere level to prevent the input of the constant current signal from interfering with the PWM dimming signal or the voltage dimming signal.

[0059] Furthermore, in a specific embodiment, the conversion circuit 31 includes a first resistor RP1, a second resistor RP3, a third resistor RP17, a fourth resistor RP22, a fifth resistor RP4, a voltage regulator diode ZP1, a second capacitor CP2, a fourth capacitor CP4, a fifth capacitor CP5, and a third capacitor CP3. Specifically, the first end of the first resistor RP1 is used to receive a dimming signal, the second end of the first resistor RP1 is connected to the dimming signal input end of the processor via the second resistor RP3, the third resistor RP17, and the fourth resistor RP22, the dimming signal input end of the processor is connected to ground via the fifth resistor RP4, the second end of the first resistor RP1 is connected to the cathode of the voltage regulator diode ZP1, the anode of the voltage regulator diode ZP1 is grounded, the second end of the first resistor RP1 is also connected to ground via the second capacitor CP2, the intersection of the second resistor RP3 and the third resistor RP17 is connected to ground via the fourth capacitor CP4, the intersection of the third resistor RP17 and the fourth resistor RP22 is connected to ground via the fifth capacitor CP5, and the third capacitor CP3 is connected in parallel with the fifth resistor RP4. In this embodiment, the first resistor RP1, the second resistor RP2, the third resistor RP17, the fourth resistor RP22 and the fifth resistor RP4 form a voltage divider circuit for dividing the dimming signal; the voltage regulator ZP1 is used to clamp the voltage at the second end of the first resistor RP1 to prevent the voltage signal input to the processor from overvoltage, thereby protecting the processor; the second capacitor CP2, the fourth capacitor CP4, the fifth capacitor CP5 and the third capacitor CP3 form a filter circuit for filtering out noise in the dimming signal and improving the detection quality of the dimming signal.

[0060] Further, the constant current circuit 32 comprises a first diode DP4, a first PNP transistor QP1, a sixth resistor RP12, a second PNP transistor QP2, a seventh resistor RP23 and a second diode DP1. Specifically, the anode of the first diode DP4 is connected to the emitter of the first PNP transistor QP1 and a direct current voltage (the direct current voltage can be provided by a switching power supply or a linear power supply in the prior art), the cathode of the first diode DP4 is connected to the base of the first PNP transistor QP1 and the emitter of the second PNP transistor QP2 through the sixth resistor RP12, the base of the emitter of the second PNP transistor QP2 is connected to the collector of the first PNP transistor QP1, the collector of the first PNP transistor QP1 is connected to the ground through the seventh resistor RP23, the collector of the second PNP transistor QP2 is connected to the anode of the second diode DP1, and the cathode of the second diode DP1 is connected to the second end of the first resistor RP1 as the constant current signal output end. In this embodiment, when the direct current voltage is normally input, the first PNP transistor QP1 and the second PNP transistor QP2 are turned on, and the loop formed by the emitter and the base of the first PNP transistor QP1 is equivalent to the loop formed by the first PNP transistor QP1 and the sixth resistor RP12 in parallel, so that the current flowing through the emitter and the collector of the second PNP transistor QP2 is equal to the voltage difference between the emitter and the base of the first PNP transistor divided by the resistance value of the sixth resistor RP12, and because the voltage difference between the emitter and the base of the first PNP transistor is basically a fixed value (about 0.6V), the collector of the second PNP transistor QP2 will output a constant current signal.

[0061] In some embodiments, the control parameter can be a voltage analog signal or a PWM signal. When the control parameter is a voltage analog signal, the voltage value of the control parameter can be calculated according to the dimming signal. Similarly, when the control parameter is a PWM signal, the duty ratio of the control parameter can be calculated according to the dimming signal. Since the performance requirement and cost of the processor with the function of outputting a voltage analog signal are relatively high, preferably, in this embodiment, the control parameter is a PWM signal. It should be noted that if the adjustment parameter further comprises a gear signal, the calculation of the control parameter also needs to consider the gear signal.

[0062] Further, in a preferred embodiment, the control parameter can be calculated according to the adjustment parameter in the following manner:

[0063] If the adjustment parameter does not include a gear signal, the control parameter is calculated according to the dimming signal; if the adjustment parameter does not include a dimming signal, the percentage coefficient is determined according to the gear signal, and the control parameter is calculated according to the rated control parameter and the percentage coefficient; if the adjustment parameter includes a dimming signal and a gear signal, the control parameter is calculated according to the dimming signal and the gear signal.

[0064] In this embodiment, the rated control parameter refers to the default rated power of the power supply circuit, which is generally the maximum rated power of the power supply circuit. Therefore, if the adjustment parameter does not include the dimming signal, after the percentage coefficient is determined by the gear signal, the rated control parameter is multiplied by the percentage coefficient to obtain the control signal. Taking the maximum rated power of the power supply circuit as 100W and the control signal as a PWM signal as an example, the duty cycle of the control signal is 80% when the maximum rated power is output. When the power supply circuit drives a lamp with a rated power of 70W, if the dimming function is not used, the percentage coefficient can be set to 70% by the gear signal. Then, the duty cycle of the control signal obtained is 56% (80%*70%). If the dimming function is used, the maximum duty cycle of the control signal will be limited to below 56%.

[0065] In a specific embodiment, the control parameter can be calculated according to the dimming signal and the gear signal in the following way:

[0066] The percentage coefficient is determined according to the gear signal, the initial control parameter is calculated according to the dimming signal, and the control parameter is obtained by multiplying the initial control parameter by the percentage coefficient. It should be noted that in this embodiment, the principle of calculating the initial control parameter according to the dimming signal is the same as that of the embodiment in which the adjustment parameter does not include the gear signal. The difference is that the parameter calculated according to the dimming signal is defined as the initial control parameter, which needs to be combined with the gear signal to calculate the final control parameter. It can be understood that through the mutual cooperation of the dimming signal and the gear signal, the power supply circuit can output appropriate power to drive the lamp, which plays a role in protecting the lamp, provides protection for the stable operation of the lamp, and also enables dimming of the lamp.

[0067] Further, in a preferred embodiment, the gear signal includes a gear analog signal and a gear level signal. Correspondingly, the percentage coefficient can be determined according to the gear signal in the following way:

[0068] The gear value is determined according to the size of the set gear data and the gear analog signal, and then the gear level is determined according to the gear level signal and the gear value. The percentage coefficient is determined according to the set gear level data and the gear level. The set gear data includes a plurality of gear set values and a threshold range corresponding to each gear set value. The set gear level data includes a plurality of set levels and a set coefficient corresponding to each set level.

[0069] In a specific embodiment, the gear value can be determined according to the size of the set gear data and the gear analog signal in the following way:

[0070] The input range of the gear analog signal is divided into several intervals, each interval corresponds to a threshold range, if the gear analog signal is in a certain threshold range, the gear value of the gear analog signal can be determined as the gear setting value corresponding to the threshold range.

[0071] Taking the input range of the gear analog signal as an example, the input range of the gear analog signal is 0-5V, which can be divided into 5 intervals, 0-1V, 1V-2V, 2V-3V, 3V-4V and 4V-5V, and in turn corresponding to gear setting values from 1st gear to 5th gear, when the gear analog signal is in the range of 4V-5V, the gear value corresponding to the gear analog signal can be determined as 5th gear.

[0072] Further, in one specific embodiment, the gear level can be calculated by the following expression:

[0073] ; wherein, is the gear level, is the gear value, is the gear multiplication coefficient, and B is the number of intervals after the input range of the gear analog signal is divided.

[0074] Taking the number of intervals as 5 and the gear level signal as a digital signal as an example, assuming the gear value is 5th gear, if the gear level signal is detected as high, the gear multiplication coefficient is set to 0, then the calculated gear level is 5th gear, if the gear level signal is detected as low, the gear multiplication coefficient is set to 1, then the calculated gear level is 10th gear.

[0075] In some embodiments, since the relationship between the power and the brightness of the lamp is positively correlated but nonlinear, when the power of the lamp is high, the change of the power is less sensitive to the brightness, when the power of the lamp is low, the change of the power is more sensitive to the brightness, in order to make the change of the brightness controlled by each gear level similar, the setting coefficient can be divided into intervals according to the gear level signal, for example, if the gear level signal is detected as high, the setting coefficient interval corresponding to the calculated gear level is set to 100%-53%, if the gear level signal is detected as low, the setting coefficient interval corresponding to the calculated gear level is set to 50%-20%, in this way, the number of adjustable gear levels in the two intervals is equal, therefore, the power can be adjusted in a large range in the 100%-53% interval, and the power can be adjusted with high precision in the 50%-20% interval, thereby making the change of the brightness controlled by each gear level approximately the same.

[0076] Further, in one specific embodiment, the percentage coefficient can be determined according to the setting gear level data and the gear level by the following way:

[0077] The setting coefficient corresponding to the setting level of the same gear level is set as a percentage coefficient.

[0078] Suppose the setting levels are 1st, 2nd,..., 10th, respectively, and the setting coefficients corresponding to the 1st to 10th are 100%, 92%,..., 28%, respectively. If the gear level is 10th, the determined percentage coefficient is 28%, and if the gear level is 5th, the determined percentage coefficient is 68%.

[0079] It should be noted that the setting gear data and the setting gear level data can be pre-stored in the storage unit in the processor or the memory of the dimming control circuit, and then read when needed. The number of setting levels can be determined according to the number of gear setting values and the number of gear multiplication coefficients; in this embodiment, the number of gear multiplication coefficients can be determined according to the signal properties of the gear level signal. If the gear level signal is a digital signal, the level state of the gear level signal is only two, so the number of gear multiplication coefficients is two. If the gear level signal is an analog signal, the level state of the gear level signal can be several, so the number of gear multiplication coefficients can be a positive integer greater than two. It can be understood that the number of types of percentage coefficients is positively correlated with the number of setting levels, so the control accuracy of the rated power of the power supply circuit can be improved by increasing the number of setting levels, which is conducive to the power supply circuit driving lamps with different rated powers.

[0080] Generally, the size of the control parameter is positively correlated with the size of the output voltage of the power supply circuit. Further, in a preferred embodiment, as shown in FIG. 8, the control parameter can be processed by the following method for synchronous start and stop: Figure 3

[0081] ​If the control parameter is less than the synchronization closing threshold, the control signal is set to the set closing parameter; if the control parameter is not less than the synchronization closing threshold and less than the synchronization opening threshold, if the control parameter presents a decreasing trend, the control signal is set to the set opening parameter, if the control parameter presents an increasing trend, the control signal is set to the set closing parameter; if the control parameter is not less than the synchronization opening threshold, the control signal is set to the control parameter. The synchronization closing threshold can be set according to the minimum closing threshold in each power supply circuit, and the synchronization opening threshold is set according to the maximum opening threshold in each power supply circuit. Taking the control parameter as a voltage analog signal as an example, assuming that the closing voltage values of the three power supply circuits simultaneously driven by the power supply circuit are 0.8V, 1V and 0.9V respectively, then 0.8V is the minimum closing threshold, that is, the synchronization closing threshold corresponds to 0.8V, when the output voltage of the power supply circuit is less than 0.8V, the three power supply circuits will be closed; that is, when the control parameter is less than the synchronization closing threshold, in order to make the output voltage of the power supply circuit less than 0.8V, the set closing parameter can be set to close to or equal to 0V; if the control signal is a PWM signal, then the set closing parameter is 0%.

[0082] Further, assuming that the opening voltage values of the three power supply circuits are 0.9V, 1.2V and 1.3V respectively, then 1.3V is the maximum opening threshold, that is, the synchronization opening threshold corresponds to 1.3V, when the voltage analog signal is greater than 1.3V, the three power supply circuits will be opened; in order to make the size of the voltage analog signal between 0.8V and 1.3V, and cause the enable and closing states of each power supply circuit to be inconsistent, thereby causing part of the lamps to light or extinguish first, the set opening parameter can be set to be greater than 1.3V; if the control signal is a PWM signal, and the duty cycle D% is the maximum opening duty cycle in each power supply circuit, then the set opening parameter can be set to D%. Optionally, the set opening parameter is equal to the synchronization opening threshold. Wherein, the opening voltage value of the power supply circuit is that when the control signal is equal to or greater than the opening voltage value, the corresponding power supply circuit will be opened. It can be understood that in this embodiment, by synchronously enabling and closing the control parameter, the control parameter can be avoided between the minimum closing threshold and the maximum opening threshold of each power supply circuit, thereby avoiding the inconsistent enable and closing states of each power supply circuit, and improving the user experience.

[0083] In the embodiment, in the process of dimming the light fixture controlled by the user, the control parameter calculated according to the adjustment parameter is gradually reduced, that is, the control parameter shows a decreasing trend, and the control signal is set to the set-on parameter to simultaneously turn on all the light fixtures only when the control parameter is less than the synchronous-on threshold, so that the light fixture works in the lowest brightness in a certain adjustment range in the process from turning on to turning off, which is beneficial to the user to visually perceive that the light fixture has been dimmed to the lowest brightness and improve the user experience; in the process of brightening the light fixture controlled by the user, the control parameter calculated according to the adjustment parameter is gradually increased, that is, the control parameter shows an increasing trend, and the control signal is set to the set-on parameter to simultaneously turn on all the light fixtures only when the control parameter is greater than the synchronous-on threshold, so that the control signal increases with the increase of the control parameter, avoiding that the light fixture cannot be visually perceived in the process from turning off to turning on in a certain adjustment range, which leads to a decrease in user experience.

[0084] Further, in a preferred embodiment, the dimming control method further comprises:

[0085] The light-sensitive circuit obtains a light control signal, and determines whether to turn off the power supply circuit according to the light control signal; if so, a turn-off signal is generated to turn off the power supply circuit.

[0086] Specifically, the light-sensitive circuit includes a light-sensitive device (which can be a photoresistor or a photodiode, etc.), which detects the brightness of the environment to avoid turning on the light fixture in the case of sufficient ambient brightness, thereby saving power.

[0087] In a specific embodiment, the processor outputs a turn-off signal to the enable end or chip select end of the power supply control chip in the power supply circuit, controls the power supply control chip to be disabled, and then makes the power supply circuit stop outputting, or makes the control signal be locked to the set-off parameter through the turn-off signal, so as to turn off the power supply circuit.

[0088] Reference Figure 4 Fig. 1 is a structural schematic diagram of a dimming control circuit according to a first embodiment of the present application, which is used to control the output power of the power supply circuit of a plurality of light fixtures, and the dimming control circuit includes an adjustment parameter acquisition circuit 1 and a processor 2.

[0089] The adjustment parameter acquisition circuit 1 is used to generate an adjustment parameter; wherein the adjustment parameter includes a dimming signal and / or a gear signal.

[0090] The processor 2 is used to calculate a control parameter according to the adjustment parameter; and is also used to perform synchronous-on / off processing on the control parameter to generate a control signal.

[0091] Reference Figure 5As shown, it is a structural schematic diagram of the dimming control circuit of the second embodiment provided by the present application, in which the dimming control circuit further comprises a dimming signal detection circuit 3 and / or a driving circuit 4.

[0092] The dimming signal detection circuit 3 is connected with the dimming signal input end of the processor 2, so as to input the converted dimming signal to the processor 2; wherein the dimming signal is one of a voltage dimming signal, a PWM dimming signal and a resistance dimming signal. Specifically, the dimming signal detection circuit 3 is used to convert the PWM dimming signal or the resistance dimming signal into a voltage signal, and to divide the converted voltage signal or the voltage dimming signal. In addition, the structure of the dimming signal detection circuit can refer to Figure 2 .

[0093] The driving circuit 4 is connected with the control signal output end of the processor 2, and is used to convert the control signal into a driving signal, so as to control the output parameter of the power supply circuit. In the embodiment in which the control signal is a PWM signal, the driving circuit 4 is used to convert the PWM signal into a voltage signal, and to enhance the driving capability of the control signal. In the embodiment in which the control signal is a voltage analog signal, since the driving capability (including the outputtable voltage amplitude and current size) of the control signal is limited by the performance of the processor 2 itself, the power supply circuit cannot be normally driven in some embodiments, while the driving circuit 4 can increase the driving capability of the control signal, so as to ensure that the driving signal voltage input to the power supply circuit is adapted, and to provide guarantee for the use condition of simultaneously controlling multiple power supply circuits. Alternatively, the driving circuit can be an amplification circuit and an integral amplification circuit commonly used in the prior art.

[0094] Further, in a preferred embodiment, as shown in Figure 5 , the dimming control circuit further comprises a photosensitive circuit 5. The photosensitive circuit 5 is connected with the processor 2, so as to generate a light control signal according to the ambient brightness. Correspondingly, the processor 2 is further used to generate a closing signal for closing the power supply circuit according to the light control signal, so as to close the power supply circuit.

[0095] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0096] Those skilled in the art will further appreciate that the functions of the various examples illustrated in the several embodiments disclosed herein can be implemented using electronic hardware, computer software, or any combination thereof. To clearly illustrate this interchangeability of hardware and software, various components will be described generally in terms of their functionality, without reference to the particular

[0097] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in RAM, flash memory, ROM, electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC.

[0098] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present application; it should be pointed out that for those skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A dimming control method for controlling the output power of a power circuit of a plurality of lamps, characterized in that: include: Acquiring adjustment parameters; wherein the adjustment parameters include a dimming signal for adjusting the output power of the power supply circuit within a rated power range and / or a gear signal for adjusting the rated power of the power supply circuit; Calculating a control parameter based on the adjustment parameter; Performing synchronous on / off processing on the control parameters to generate a control signal; Calculating the control parameter based on the adjustment parameter includes: if the adjustment parameter does not include a gear signal, calculating the control parameter based on the dimming signal; if the adjustment parameter does not include a dimming signal, determining a percentage coefficient based on the gear signal, and calculating the control parameter based on the rated control parameter and the percentage coefficient; if the adjustment parameter includes a dimming signal and a gear signal, calculating the control parameter based on the dimming signal and the gear signal; Calculating the control parameter according to the dimming signal and the gear signal includes: determining a percentage coefficient according to the gear signal; calculating an initial control parameter according to the dimming signal; and multiplying the initial control parameter by the percentage coefficient to obtain the control parameter; The synchronous opening and closing processing of the control parameter includes: if the control parameter is less than the synchronous closing threshold, setting the control signal to the set closing parameter; if the control parameter is not less than the synchronous closing threshold and less than the synchronous opening threshold, if the control parameter shows a decreasing trend, setting the control signal to the set opening parameter; if the control parameter shows an increasing trend, setting the control signal to the set closing parameter; if the control parameter is not less than the synchronous opening threshold, setting the control signal to the control parameter; wherein, the set closing parameter is close to or equal to 0V, and the set opening parameter is greater than or equal to the synchronous opening threshold.

2. The dimming control method according to claim 1, wherein: The dimming signal is one of a voltage dimming signal, a PWM dimming signal and a resistance dimming signal.

3. The dimming control method according to claim 2, wherein: Before obtaining the adjustment parameters, the method further includes: After the dimming signal is converted into a voltage signal by a dimming signal detection circuit in the dimming control circuit, the dimming signal in the adjustment parameter is obtained.

4. The dimming control method according to claim 1, wherein: The gear position signal includes a gear position simulation signal and a gear position level signal; Determining the percentage coefficient according to the gear position signal includes: Dividing the input range of the gear position analog signal into a plurality of intervals, and each of the intervals corresponds to a threshold range; The gear value is determined according to the set gear data and the size of the gear simulation signal, and then the gear multiplication coefficient is determined according to the gear level signal. The gear level is determined according to the gear multiplication coefficient, the number of intervals after the input range of the gear simulation signal is divided, and the gear value, and the percentage coefficient is determined according to the set gear level data and the gear level; wherein the set gear data includes a plurality of gear setting values ​​and a threshold range corresponding to each of the gear setting values; the set gear level data includes a plurality of setting levels and a setting coefficient corresponding to each of the setting levels; The gear level is expressed as ,in, is the gear level, is the gear value, is the gear multiplication coefficient, and B is the number of intervals after the input range of the gear simulation signal is divided.

5. The dimming control method according to any one of claims 1 to 4, characterized in that: Also includes: Obtain light control signals through photosensitive circuits; It is determined whether to turn off the power circuit according to the light control signal, and if so, a shutdown signal is generated to turn off the power circuit.

6. A dimming control circuit for controlling the output power of a power circuit of a plurality of lamps, characterized in that: include: An adjustment parameter acquisition circuit is used to generate adjustment parameters; the adjustment parameters include a dimming signal for adjusting the output power of the power supply circuit within a rated power range and / or a gear signal for adjusting the rated power of the power supply circuit; a processor, configured to calculate a control parameter based on the adjustment parameter; It is also used to perform synchronous opening and closing processing on the control parameters to generate a control signal; Calculating the control parameter based on the adjustment parameter includes: if the adjustment parameter does not include a gear signal, calculating the control parameter based on the dimming signal; if the adjustment parameter does not include a dimming signal, determining a percentage coefficient based on the gear signal, and calculating the control parameter based on the rated control parameter and the percentage coefficient; if the adjustment parameter includes a dimming signal and a gear signal, calculating the control parameter based on the dimming signal and the gear signal; Calculating the control parameter according to the dimming signal and the gear signal includes: determining a percentage coefficient according to the gear signal; calculating an initial control parameter according to the dimming signal; and multiplying the initial control parameter by the percentage coefficient to obtain the control parameter; The synchronous opening and closing processing of the control parameter includes: if the control parameter is less than the synchronous closing threshold, setting the control signal to the set closing parameter; if the control parameter is not less than the synchronous closing threshold and less than the synchronous opening threshold, if the control parameter shows a decreasing trend, setting the control signal to the set opening parameter; if the control parameter shows an increasing trend, setting the control signal to the set closing parameter; if the control parameter is not less than the synchronous opening threshold, setting the control signal to the control parameter; wherein, the set closing parameter is close to or equal to 0V, and the set opening parameter is greater than or equal to the synchronous opening threshold.

7. The dimming control circuit according to claim 6, wherein: It also includes a dimming signal detection circuit and / or a driving circuit; The dimming signal detection circuit is connected to the dimming signal input terminal of the processor, and is used to convert the dimming signal and input it into the processor; wherein the dimming signal is one of a voltage dimming signal, a PWM dimming signal and a resistance dimming signal; The driving circuit is connected to the control signal output terminal of the processor and is used to convert the control signal into a driving signal to control the output parameters of the power supply circuit.

8. The dimming control circuit according to claim 6 or 7, characterized in that: Also includes: A light-sensitive circuit, connected to the processor, for generating a light-control signal according to ambient brightness; The processor is further configured to generate a shutdown signal for shutting down the power circuit according to the light control signal, so as to shut down the power circuit.

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