CN118250865A - Self-adaptive illumination control circuit and driving method - Google Patents
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Abstract
The invention relates to the technical field of LED lamp regulation and control, in particular to a self-adaptive illumination control circuit and a driving method, wherein the control circuit comprises the following components: the device comprises a lighting unit, a current control unit and a power supply unit, wherein the lighting unit comprises a plurality of loads which are connected in parallel; the current control unit is configured to obtain an output adjustment value of the direct current to be output according to the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and generate a current control signal according to the output adjustment value, wherein the set value is set based on a preset output current amplitude condition; the power supply unit is configured to receive the current control signal and output a direct current according to the output adjustment value to supply to the lighting unit. In the direct current constant current control loop, the invention does not influence the original luminous flux of other lamps to maintain normal when the lamps are partially switched on or switched off.
Description
Technical Field
The invention relates to the technical field of LED lamp regulation and control, and particularly provides a self-adaptive illumination control circuit and a driving method.
Background
With the rapid development of LED lighting technology, conventional LED lighting systems gradually exhibit limitations in power supply and control modes. The traditional high-altitude multipoint distributed driving control mode, namely that each LED lamp is independently provided with a single lamp driving power supply and a single lamp dimming controller, requires full road coverage of a communication network, and faces a series of problems in practical application.
First, the multipoint distributed drive control has a problem of high failure rate. Since each lamp requires a separate drive power supply and dimming controller, a single lamp may need to be repaired or replaced once a component fails. This not only increases the difficulty of maintenance, but also increases the cost of maintenance.
Secondly, maintenance difficulty of the multipoint distributed driving control is great. Because the lamps are widely distributed and numerous, maintenance personnel need to check and maintain each lamp one by one, and a great deal of manpower and material resources are consumed.
In addition, multipoint decentralized drive control requires full road segment communication network coverage. This not only increases the complexity of the system, but also increases the cost of the system. At the same time, the stability and reliability of the communication network is critical for the proper operation of the entire lighting system. Once the communication network fails, the whole lighting dimming control system may be paralyzed, thereby affecting the daily life and work of people.
The lighting control technology with simple system architecture and stable dimming and energy-saving effects needs to be developed.
Disclosure of Invention
In order to overcome the defects, the invention provides a self-adaptive lighting control circuit and a driving method, the circuit has low cost, a communication network is not required to be built on the whole road section, the centralized control reliability is high, the dimming control of a lighting system is finished by adjusting the output adjustment value of direct current to be output in a loop, and the original luminous flux of other lamps is not influenced when the lamps are partially switched on or switched off.
In a first aspect, the present invention provides an adaptive lighting control circuit comprising: a lighting unit, a current control unit and a power supply unit, wherein,
The lighting unit comprises a plurality of loads, and the loads are connected in parallel;
the current control unit is configured to obtain an output adjustment value of the direct current to be output based on the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and generate a current control signal according to the output adjustment value, wherein the set value is set according to a preset output current amplitude condition;
The power supply unit is configured to receive the current control signal and output a direct current according to the output adjustment value to supply to the lighting unit.
Further, the power supply unit includes:
an AC-DC power supply, wherein,
The input end of the AC-DC power supply is connected with a three-phase or single-phase alternating current power supply;
The control end of the AC-DC power supply is connected with the current control unit and is used for receiving a current control signal;
and the output end of the AC-DC power supply is used for outputting direct current according to the output adjustment value.
Further, two ends of the load are respectively connected with the positive electrode output end and the negative electrode output end of the power supply unit.
Further, the current control unit includes:
the voltage dividing module is used for dividing the output voltage of the power supply unit to obtain a first voltage value;
The control module is used for obtaining a detection value of the direct current voltage output by the power supply unit by detecting the first voltage value, obtaining an output adjustment value of the direct current to be output according to the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and sending a current control signal according to the output adjustment value.
Further, the voltage dividing module includes: a first resistor and a second resistor, wherein,
The first end of the first resistor is connected with the positive electrode output end of the power supply unit;
The second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the negative electrode output end of the power supply unit;
The second end of the first resistor is connected with the control module.
Further, the first resistor comprises a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, wherein,
The first end of the first voltage dividing resistor is used as the first end of the first resistor to be connected with the positive electrode output end of the power supply unit, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor;
the second end of the second voltage dividing resistor is connected with the first end of the third voltage dividing resistor;
the second end of the third voltage dividing resistor is used as the second end of the first resistor and is connected with the first end of the second resistor.
Further, the control module comprises an MCU, wherein the MCU comprises a first pin, a second pin, a third pin and a fourth pin, the first pin is connected with the second end of the first resistor, the second pin is connected with an MCU power supply, the third pin is connected with the negative electrode output end of the power supply unit and then grounded, the fourth pin is connected with the negative electrode output end of the power supply unit, and a third resistor is connected between the third pin and the fourth pin.
Further, the control module further comprises a PWM unit;
and the MCU controls the power supply unit to output direct current according to the output adjustment value through the PWM unit.
Further, the obtaining the output adjustment value of the dc current to be output based on the difference between the detected value and the set value of the dc voltage output by the power supply unit includes:
A mapping relation between the output direct-current voltage and the direct-current of a power supply unit is established in advance;
obtaining a direct current value corresponding to the detection value of the direct current voltage output by the power supply unit according to the mapping relation;
And judging whether the difference between the detection value and the set value exceeds a preset threshold value, if so, configuring the output adjustment value of the direct current to be output to be higher or lower than the direct current value corresponding to the detection value.
Further, the configuring the output adjustment value of the dc current to be output to be higher or lower than the dc current value corresponding to the detection value includes:
Judging whether the detection value of the direct current voltage output by the power supply unit is larger than the set value, if so, configuring the output adjustment value of the direct current to be output to be lower than the direct current value corresponding to the detection value;
And judging whether the detection value of the direct current voltage output by the power supply unit is smaller than the set value, and if so, configuring the output adjustment value of the direct current to be output to be higher than the direct current value corresponding to the detection value.
Further, the configuring the output adjustment value of the dc current to be output to be higher than the dc current value corresponding to the detection value further includes:
The output adjustment value of the direct current to be output is configured to be not higher than a maximum output direct current value of the power supply unit.
In a second aspect, the present invention provides a driving method of the adaptive illumination control circuit, including:
The detection value of the direct-current voltage output by the power supply unit is obtained through a current control unit;
Setting a set value of the direct current output voltage of the power supply unit according to a preset output current amplitude condition;
obtaining an output adjustment value of the direct current to be output based on the difference between the detection value and the set value;
Generating a current control signal according to the output adjustment value;
and receiving the current control signal through a power supply unit and outputting direct current according to the output adjustment value so as to supply the direct current to the lighting unit.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
When the non-driving LED lamps connected in parallel by the direct current constant current power supply loop are increased or decreased, the constant current can be adaptively output to enable the voltage of the output loop to automatically follow the rising or falling, so that the purpose of constant luminous flux output of the lamps connected in the loop is achieved, and the independent lamp on or off control of a plurality of lamps in the direct current constant current power supply loop is possible.
The invention can randomly and locally switch on or off the lamp in the direct current constant current control loop without affecting the original luminous flux of other lamps to maintain normal, thereby being beneficial to simplifying an intelligent lighting system and further stabilizing and saving energy for a long time.
The invention solves the problem of centralized constant current power supply and the problem of free control of the on/off of the non-driving lamp connected with the direct current loop.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, like numerals in the figures are used to designate like parts, wherein:
FIG. 1 is a schematic block diagram of the main components of an adaptive lighting control circuit according to one embodiment of the invention;
FIG. 2 is a schematic diagram of an adaptive lighting control circuit according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a current control unit according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a current control unit including PWM according to one embodiment of the invention;
FIG. 5 is a schematic circuit diagram of a power control device including a plurality of power control devices according to one embodiment of the invention;
FIG. 6 is a schematic diagram of the main steps of a circuit driving method according to one embodiment of the invention;
FIG. 7 is a schematic diagram of an illumination system architecture according to a comparative example of the present invention;
Fig. 8 is a schematic diagram of an illumination system architecture according to another comparative example of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1 and 2, the present invention provides an adaptive lighting control circuit comprising: a lighting unit, a current control unit and a power supply unit, wherein,
The lighting unit comprises a plurality of loads, and the loads are connected in parallel;
the current control unit is configured to obtain an output adjustment value of the direct current to be output based on the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and generate a current control signal according to the output adjustment value of the direct current to be output, wherein the set value is set according to a preset output current amplitude condition;
The power supply unit is configured to receive the current control signal and output a direct current according to the output adjustment value to supply to the lighting unit.
The current amplitude condition takes direct current output by the power supply unit under 100% rated power as a reference. For example, if the dc current output by the power supply unit at 100% rated power is 10A, the current value corresponding to 50% current amplitude should be 5A and the current value corresponding to 30% current amplitude should be 3A according to this reference. The percentage of the current amplitude can be preset according to the actual requirement, and the reference current value output by the power supply unit, namely the set value of the direct current voltage output by the power supply unit, is set by the preset current amplitude condition. The setting process ensures the stability and the accuracy of the power supply unit of the power supply and meets the requirements of different application scenes.
In one embodiment, the load is an LED lamp.
In one embodiment, the power supply unit includes:
an AC-DC power supply, wherein,
The input end of the AC-DC power supply is connected with a three-phase or single-phase alternating current power supply;
The control end of the AC-DC power supply is connected with the current control unit and is used for receiving a current control signal;
and the output end of the AC-DC power supply is used for outputting direct current according to the output adjustment value of the direct current to be output.
Three-phase alternating current or single-phase alternating current is output to an AC-DC power supply, the AC-DC power supply is controlled to output direct current, and the output direct current is determined by a current control signal.
In one embodiment, two ends of the load are respectively connected with the positive electrode output end and the negative electrode output end of the power supply unit.
The output voltage between the positive electrode output end and the negative electrode output end of the power supply unit is Ue, and the output current is Ie.
The positive output end of the power supply unit is connected with the first branch, and the negative output end of the power supply unit is connected with the second branch. The first branch is also provided with a diode D1, the anode of the diode D1 is connected with the negative electrode output end of the power supply unit, and the cathode of the diode D1 is connected with a load. The diode D1 functions to prevent the reverse flow of current.
In one embodiment, referring to fig. 3, the current control unit includes:
the voltage dividing module is used for dividing the output voltage of the power supply unit to obtain a first voltage value;
the control module is used for obtaining a detection value of the direct current voltage output by the power supply unit by detecting the first voltage value, obtaining an output adjustment value of the direct current to be output according to the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and sending a current control signal according to the output adjustment value;
in one embodiment, the voltage dividing module includes: a first resistor and a second resistor, wherein,
The first end of the first resistor is connected with the positive electrode output end of the power supply unit;
The second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the negative electrode output end of the power supply unit;
The second end of the first resistor is connected with the control module.
The first resistor and the second resistor act as voltage dividing.
The first resistor and the second resistor can respectively comprise a plurality of voltage dividing resistors which are connected in series, and the resistance is set according to actual needs.
In one embodiment, the first resistor comprises a first voltage dividing resistor R1, a second voltage dividing resistor R2 and a third voltage dividing resistor R3, wherein,
The first end of the first voltage dividing resistor R1 is used as a first end of a first resistor and is connected with the positive electrode output end of the power supply unit, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor R2;
The second end of the second voltage dividing resistor R2 is connected with the first end of the third voltage dividing resistor R3;
the second end of the third voltage dividing resistor R3 is connected to the first end of the second resistor R4 as the second end of the first resistor.
The second end of the third voltage dividing resistor R3 or the first end of the second resistor R4 is a Vf sampling point, the high voltage output from the AC-DC power supply is 300-500V, and the voltage output into the control module is usually low voltage, for example, the MCU controller needs 1.5V-2V low voltage, so that the voltage of the Vf sampling point is reduced to 1.5V-2V through resistor voltage division.
In one embodiment, the cathode of the diode D1 is connected to the first end of the first voltage dividing resistor R1.
In one embodiment, the control module includes an MCU, where the MCU includes a first pin, a second pin, a third pin, and a fourth pin, where the first pin is connected to a second end of the first resistor, that is, to Vf, and the voltage of the first pin is the same as the voltage at the sampling point Vf, and through the voltage at Vf and the resistance values of the first resistor and the second resistor, the detection value of the dc voltage output by the power supply unit can be known, and the value is the voltage detection value obtained through actual monitoring.
The second pin Vcc is connected with an MCU power supply.
The third pin is connected with the negative electrode output end of the power supply unit and then grounded, and specifically, the third pin is connected with the second branch circuit and then grounded.
The fourth pin is connected with the negative electrode output end of the power supply unit, and specifically, the fourth pin is connected with the second branch.
And a third resistor Rf is connected between the third pin and the fourth pin, and the third resistor Rf is arranged on the second branch.
The control mode of the current control unit comprises the following steps: PWM/serial communication/RS 485/0-10V and other modes.
In one embodiment, PWM is used as an example, with reference to fig. 4. The control module further includes a PWM unit. And the MCU controls the power supply unit to output direct current according to the output adjustment value through the PWM unit.
The power supply unit comprises a dimming interface for receiving a current control signal, wherein the dimming interface comprises a dimming positive electrode interface end m+ and a dimming negative electrode interface end m-.
The MCU further comprises a fifth pin P+ and a sixth pin P-, wherein the fifth pin P+ is connected with the dimming positive electrode interface end m+ through a PWM unit, and the sixth pin P-is connected with the dimming negative electrode interface end m-through the PWM unit.
When signal control is performed using PWM, the MCU is used to generate a PWM signal. The MCU can control the output pins of the MCU through programming to generate PWM signals, and the signals can further drive a power supply unit of the LED to supply power as current control signals. The MCU programming can adjust the duty cycle (i.e., the ratio of the high level to the total period) of the PWM signal, thereby achieving control over the amplitude of the analog signal.
In one embodiment, the MCU further includes a seventh pin and an eighth pin for connection with an external controller. The seventh pin and the eighth pin are connection interfaces of MCU, such as RS485 communication interface, the MCU receives the dimming command of the external controller through the RS485 communication interface, and converts the dimming command into a current control signal to be input into the m+/m-dimming interface of the AC-DC constant current inverter, and the AC-DC constant current inverter outputs according to the constant current amplitude of the dimming command.
The power supply unit in fig. 4 is illustrated by taking a domestic commonly used AC380V/220V voltage level as an example, but is not limited to the above example.
The control manner of the current control unit of the present invention is not limited to the above-described example.
In one embodiment, the obtaining the output adjustment value of the dc current to be output based on the difference between the detected value and the set value of the dc voltage output by the power supply unit includes:
s10, a mapping relation between the direct-current voltage and the direct-current output by a power supply unit is established in advance;
s20, obtaining a direct current value corresponding to the detection value of the direct current voltage output by the power supply unit according to the mapping relation;
And S30, judging whether the difference between the detection value and the set value exceeds a preset threshold value, if so, configuring the output adjustment value of the direct current to be output to be higher or lower than the direct current value corresponding to the detection value.
In one embodiment, in step S30, the configuring the output adjustment value of the dc current to be output to be higher or lower than the dc current value corresponding to the detection value includes:
S31, judging whether a detection value of the direct current voltage output by the power supply unit is larger than the set value, if so, configuring an output adjustment value of the direct current to be output to be lower than a direct current value corresponding to the detection value;
S32, judging whether the detection value of the direct current voltage output by the power supply unit is smaller than the set value, and if so, configuring the output adjustment value of the direct current to be output to be higher than the direct current value corresponding to the detection value.
In one embodiment, in step S30, the configuring the output adjustment value of the dc current to be output to be higher than the dc current value corresponding to the detection value further includes:
The output adjustment value of the direct current to be output is configured to be not higher than a maximum output direct current value of the power supply unit.
In an application scenario, when the number of load LED lamps changes, for example, the number of original on lamps is 10, wherein n (n=1, 2 … …) off actions occur, the output voltage Ue of the power supply unit rises, the MCU timely measures the change of the voltage and then adjusts the current output amplitude downwards, and at this time, the voltage Ue falls back to the allowable range of the voltage value before the off actions; if the number of the turned-on lamps is increased by n (n=1, 2 … …), the output voltage Ue of the power supply is reduced, the MCU timely measures the change of the voltage, and then the current output amplitude is adjusted upwards, at the moment, the voltage Ue is risen to the voltage value allowable range of the original number of the turned-on lamps, and the constant luminous flux control of each lamp under different dimming amplitude commands is realized.
In one embodiment, S10, pre-establishing a mapping relationship between the dc voltage and the dc current output by the power supply unit includes:
A mapping relation between a direct-current constant-current supply voltage and a direct-current constant-current supply current of a power supply unit is established in advance, the direct-current constant-current supply voltage of the power supply unit is Ue in fig. 2, and the direct-current constant-current supply current is Ie in fig. 2.
In an application scene, in a line construction site, under a 100% rated working condition, the direct current and constant current supply voltage and the direct current and constant current supply current of a power supply unit are obtained by recording as I e100, the maximum constant current output value is taken as a basis, the amplitude of the current is adjusted, for example, under 50% of I e100, the current and voltage values are obtained, and the mapping relation between the direct current and constant current supply voltage and the direct current and constant current supply current of the power supply unit is finally obtained through the mapping relation between the current and voltage under different adjustment current amplitudes (10% of I e100, 20% of I e100, 30% of I e100 and the like), for example: under 100% rated operating conditions, U e100 is 250V, I e100 is 10A, and 50% I e100, U e50 is 230V, and I e50 is 5A.
In one application scenario, it is exemplified that the lighting unit is lighted with 5 lamps, the detection value of the dc voltage output by the power supply unit measured by the current control unit is 230.00V, the set value of the dc voltage output by the power supply unit is 230.00V, and the set voltage meets the set voltage requirement. The preset threshold is 0.3V, that is, the detection value is not in the range of 230.00V plus or minus 0.3V, and the power supply unit needs to be regulated to output a direct current output value.
When 1 lamp is turned off, the Ue rises, the monitored Vf voltage is obtained by the MCU through the voltage division of the voltage division module, and then the detected value of the dc voltage output by the power supply unit is 230.5V. Judging whether the difference between the detected value (230.5V) and the set value (230.00V) exceeds a preset threshold (0.3V), wherein the difference refers to the absolute value of the difference, and the output adjustment value of the direct current to be output is configured to be higher or lower than the direct current value corresponding to the detected value by judging that the difference between the detected value (230.5V) and the set value (230.00V) is 0.5V. And when the detection value is not within the range of 230.00 V+/-delta 0.3V, the direct current to be output is regulated up or regulated down.
Judging whether the detection value of the direct current voltage output by the power supply unit is larger than the set value, if so, configuring the output adjustment value of the direct current to be output to be lower than the direct current value corresponding to the detection value, and in the application scene, according to the preset mapping relation, 230.5V corresponds to 5.5A because the voltage Ue rises after the lamp is turned off and the direct current output by the power supply unit is required to fall, configuring the current value to be adjusted to be lower than 5.5A, such as 3A, using 3A as the output adjustment value of the direct current to be output by an external controller, generating a controller dimming command, sending the controller dimming command to an MCU, receiving the dimming command of the external controller by an RS485 communication interface, converting the dimming command into a current control signal and sending the current control signal to the control end of the AC-DC power supply by the MCU.
When the lamp is turned off, the output voltage Ue of the power supply unit rises, the MCU timely measures the change of the voltage, and then the current output amplitude is adjusted down, and the voltage Ue falls back to the allowable range of the voltage value before the lamp turning off operation.
If the number of the turned-on lamps is increased by n (n=1, 2 … …), the output voltage Ue of the power supply is decreased, the MCU obtains the monitored Vf voltage, and further obtains the detection value of the dc voltage output by the power supply unit of the power supply to be 229V. Judging whether the difference between the detection value (229V) and the set value (230.00V) exceeds a preset threshold value (delta 0.3V), wherein the difference value refers to an absolute difference value, and the output adjustment value of the direct current to be output is configured to be higher or lower than the direct current value corresponding to the detection value by judging that the difference between the detection value (229V) and the set value (230.00V) is 1V. And when the detection value is not within the range of 230.00 V+/-delta 0.3V, the direct current to be output is regulated up or regulated down.
After the MCU timely measures the change of the voltage, judging whether the detection value of the direct current voltage output by the power supply unit is smaller than the set value, if so, up-regulating the current output amplitude, configuring the output regulation value of the direct current to be output to be higher than the direct current value corresponding to the detection value, according to the preset mapping relation, 229V corresponds to 4.5A, improving the current, configuring the output value of the direct current to be 6V, and at the moment, returning the voltage Ue to the voltage value allowable range of the number of the original turned-on lamps, thereby realizing the constant luminous flux control of each lamp under different dimming amplitude commands.
The process is continuously and dynamically adjusted, and when the detection value is inconsistent with the set value, the output current value of the power supply is adjusted.
The corresponding loop voltage of different dimming constant current value amplitudes is different, for example, when the dimming amplitude is 100%, the corresponding direct current loop follows voltage is 270V, when the dimming amplitude is 50%, the direct current loop follows voltage is 250V, then the loop is turned on under the dimming amplitude of 50%, the lighting control system is in soft start on control, namely, the dimming value is gradually increased from 0 to a set value (the set value of the output direct current voltage of the power supply unit is 250V), the system continuously detects the output end voltage (the detected value of the output direct current voltage of the power supply unit) until the output end voltage (the output direct current voltage of the power supply unit) reaches the original following value (250V), and if the output end voltage is excessively regulated to be higher than the original following value (250V), the output constant current value (the output direct current of the power supply unit) is regulated downwards until the output end voltage is within the deviation value of the allowable range of the original following value (the difference between the detected value and the set value is not more than the preset threshold).
In one embodiment, in S32, the configuring the output adjustment value of the dc current to be output to be higher than the dc current value corresponding to the detection value further includes:
The output adjustment value of the direct current to be output is configured to be not higher than a maximum output direct current value of the power supply unit.
Under the no-load condition, the output voltage of the driving power supply, namely the power supply unit, is far higher than the actual lighting voltage, and the impact current which is several times generated when the lamp is connected in the moment causes damage, so that the driving power supply voltage control link needs to be added: the no-load output voltage is clamped according to a following voltage value (a detection value of the direct-current voltage output by the power supply unit) corresponding to the direct-current voltage output by the power supply unit under a given dimming amplitude. When the system loop is empty, the dimming amplitude is automatically reduced to a minimum output state, such as 5% constant current amplitude, and the empty voltage is automatically followed according to the 5% constant current value; when the lamp is connected, the output constant current is gradually adjusted to rise to a given value, but the following voltage cannot be larger than the original value, namely the output current does not reach the given constant current value and also stops rising. For example, when the maximum output current of the AC-DC power supply unit is 10A, i.e., I e100 is 10A, and the detected value of the DC voltage output by the power supply unit is smaller than the set value, the current output amplitude is adjusted upward, and the output adjustment value of the DC current to be output is configured to be higher than the DC current value corresponding to the detected value, and is not more than 10A at the highest.
In one embodiment, the output ends of the independent multiple DC control devices are output in parallel, and the constant current control circuit can be integrated, or can be designed to be independently configured or built into one single DC control device, and can be an AC-DC constant current inverter power supply of fig. 2, or can be an integrated current control unit and a power supply unit of the independent multiple power control devices of fig. 5. The dimming command of the external controller is used for controlling dimming and saving energy by giving a constant current output set value through various serial communication modes such as RS485 and the like.
When the non-driving LED lamp connected in parallel by the direct current constant current power supply loop increases or decreases, the direct current control device automatically adjusts the light to control the output constant current value to enable the voltage of the output loop to automatically follow the rising or falling, so that the purpose of constant luminous flux output of the lamp connected by the loop is achieved. The control of the independent on-off of the lamps in the direct current constant current power supply loop is possible. The direct current constant current centralized control loop can be randomly and locally switched on or switched off to operate without affecting the original luminous flux of other lamps to maintain normal, thereby being beneficial to simplifying an intelligent lighting system and further stabilizing and saving energy for a long time.
In one embodiment, referring to fig. 6, the present invention further provides a driving method using the adaptive illumination control circuit, including:
step 1, obtaining a detection value of direct-current voltage output by the power supply unit through a current control unit;
Step 2, setting a set value of the output direct-current voltage of the power supply unit according to a preset output current amplitude condition;
Step 3, obtaining an output adjustment value of the direct current to be output based on the difference between the detection value and the set value;
Step 4, generating a current control signal according to the output adjustment value;
and step 5, receiving the current control signal through a power supply unit and outputting direct current according to the output adjustment value so as to supply the direct current to the lighting unit.
According to the invention, under a certain constant current given value condition, according to the corresponding relation between the preset output voltage value Ue and the dimming constant current value Ie, when the deviation of the loop voltage is detected, the constant current output value Ie is automatically regulated, so that the output voltage Ue is stabilized on the preset corresponding value.
In one embodiment, when the line cable has a large pressure drop, the cable pressure drop, ue=f (I) +ir, needs to be considered. Ue is the output voltage of the dc constant current constant voltage power supply; i is a constant current value; r is the supply line cable resistance; f (I) is a function of the LED light source voltage and current, and can be obtained through experimental simulation. The output voltage Ue is stabilized on a corresponding voltage value by adjusting the constant current value I, and the self-adaptive automatic adjustment can be realized no matter how the number of the LED light sources connected to the loop is increased or decreased.
Comparative example 1
Referring to fig. 7, a conventional LED ac powered lighting system architecture is: an alternating current power supply lighting distribution box, an alternating current power supply loop, a single lamp dimming controller, a single lamp constant current driving power supply and LED lamp beads.
The traditional alternating current power supply system has the following defects: the electric shock and leakage safety risk exists, the system architecture is complex, the failure rate is high, the cost is high, the high-altitude operation and maintenance cost is high, and the service life of the lamp is 4-6 years.
Comparative example 2
Referring to fig. 8, a conventional LED dc constant voltage power supply lighting system architecture is: the LED lamp comprises a direct-current power supply lighting power box, a direct-current constant-voltage power supply loop, a single-lamp dimming controller, a single-lamp constant-current driving power supply and LED lamp beads.
The traditional direct current constant voltage power supply system has the defects that: the system has more complex architecture, high failure rate, high maintenance cost for high-altitude operation, higher cost and 5-7 years of service life of the lamp.
The power supply and control modes of the traditional LED lighting system are high-altitude multipoint distributed driving control, each LED lamp is independently provided with a single-lamp driving power supply and a single-lamp dimming controller, and the whole road coverage (wireless, wired or carrier wave form) of a communication network is required. The multipoint distributed driving control has the problems of high failure rate, high maintenance difficulty, high maintenance cost and the like.
The invention removes vulnerable parts, has extremely simple structure, ensures that the direct current power supply and the dimming control are in place in one step, prolongs the service life of the lamp by doubling, and solves three major pain points of safety, energy conservation and economy in the lighting industry at one time. The system cost is reduced, the dimming energy-saving effect is stable, and the method has extremely high application value in engineering.
The working principle of the invention is completely different from that of the traditional constant-current control system or constant-voltage control system, so that the invention not only solves the problem of centralized constant-current power supply, but also solves the problem of free control of the switch lamp of the non-driving lamp connected with the direct-current loop. Not only reduces the system cost, but also has good dimming and energy-saving effects.
It should be noted that, although the foregoing embodiments describe the steps in a specific order, it will be understood by those skilled in the art that, in order to achieve the effects of the present invention, the steps are not necessarily performed in such an order, and may be performed simultaneously (in parallel) or in other orders, and these variations are within the scope of the present invention.
In the description of the present invention, a "module" may include hardware, software, or a combination of both. A module may include hardware circuitry, various suitable sensors, and communication ports. Further, it should be understood that, since the respective modules are merely set to illustrate the functional units of the apparatus of the present invention, the physical devices corresponding to the modules may be the processor itself, or a part of software in the processor, a part of hardware, or a part of a combination of software and hardware. Accordingly, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting or combining falls within the protection scope of the present invention.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (12)
1. An adaptive lighting control circuit, comprising: a lighting unit, a current control unit and a power supply unit, wherein,
The lighting unit comprises a plurality of loads, and the loads are connected in parallel;
the current control unit is configured to obtain an output adjustment value of the direct current to be output based on the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and generate a current control signal according to the output adjustment value, wherein the set value is set according to a preset output current amplitude condition;
The power supply unit is configured to receive the current control signal and output a direct current according to the output adjustment value to supply to the lighting unit.
2. The circuit of claim 1, wherein the power supply unit comprises:
an AC-DC power supply, wherein,
The input end of the AC-DC power supply is connected with a three-phase or single-phase alternating current power supply;
The control end of the AC-DC power supply is connected with the current control unit and is used for receiving a current control signal;
and the output end of the AC-DC power supply is used for outputting direct current according to the output adjustment value.
3. The circuit of claim 1, wherein the load is connected at both ends to the positive and negative outputs of the power supply unit, respectively.
4. The circuit of claim 1, wherein the current control unit comprises:
the voltage dividing module is used for dividing the output voltage of the power supply unit to obtain a first voltage value;
The control module is used for obtaining a detection value of the direct current voltage output by the power supply unit by detecting the first voltage value, obtaining an output adjustment value of the direct current to be output according to the difference between the detection value of the direct current voltage output by the power supply unit and a set value, and sending a current control signal according to the output adjustment value.
5. The circuit of claim 4, wherein the voltage divider module comprises: a first resistor and a second resistor, wherein,
The first end of the first resistor is connected with the positive electrode output end of the power supply unit;
The second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the negative electrode output end of the power supply unit;
The second end of the first resistor is connected with the control module.
6. The circuit of claim 5, wherein the first resistor comprises a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor, wherein,
The first end of the first voltage dividing resistor is used as the first end of the first resistor to be connected with the positive electrode output end of the power supply unit, and the second end of the first voltage dividing resistor is connected with the first end of the second voltage dividing resistor;
the second end of the second voltage dividing resistor is connected with the first end of the third voltage dividing resistor;
the second end of the third voltage dividing resistor is used as the second end of the first resistor and is connected with the first end of the second resistor.
7. The circuit of claim 5 or 6, wherein the control module comprises an MCU, wherein the MCU comprises a first pin, a second pin, a third pin, and a fourth pin, the first pin is connected to the second end of the first resistor, the second pin is connected to the MCU power supply, the third pin is connected to the negative output of the power supply unit and then grounded, the fourth pin is connected to the negative output of the power supply unit, and a third resistor is connected between the third pin and the fourth pin.
8. The circuit of claim 7, wherein the control module further comprises a PWM unit;
and the MCU controls the power supply unit to output direct current according to the output adjustment value through the PWM unit.
9. The circuit of claim 1, wherein the obtaining the output adjustment value of the dc current to be output based on the difference between the detected value and the set value of the dc voltage output by the power supply unit comprises:
A mapping relation between the output direct-current voltage and the direct-current of a power supply unit is established in advance;
obtaining a direct current value corresponding to the detection value of the direct current voltage output by the power supply unit according to the mapping relation;
And judging whether the difference between the detection value and the set value exceeds a preset threshold value, if so, configuring the output adjustment value of the direct current to be output to be higher or lower than the direct current value corresponding to the detection value.
10. The circuit of claim 9, wherein the configuring the output adjustment value of the dc current to be output to be higher or lower than the dc current value corresponding to the detection value comprises:
Judging whether the detection value of the direct current voltage output by the power supply unit is larger than the set value, if so, configuring the output adjustment value of the direct current to be output to be lower than the direct current value corresponding to the detection value;
And judging whether the detection value of the direct current voltage output by the power supply unit is smaller than the set value, and if so, configuring the output adjustment value of the direct current to be output to be higher than the direct current value corresponding to the detection value.
11. The circuit of claim 10, wherein the configuring the output adjustment value of the dc current to be output to be higher than the corresponding dc current value of the detection value further comprises:
The output adjustment value of the direct current to be output is configured to be not higher than a maximum output direct current value of the power supply unit.
12. A driving method of the adaptive lighting control circuit according to any one of claims 1 to 11, comprising:
The detection value of the direct-current voltage output by the power supply unit is obtained through a current control unit;
Setting a set value of the direct current output voltage of the power supply unit according to a preset output current amplitude condition;
obtaining an output adjustment value of the direct current to be output based on the difference between the detection value and the set value;
Generating a current control signal according to the output adjustment value;
and receiving the current control signal through a power supply unit and outputting direct current according to the output adjustment value so as to supply the direct current to the lighting unit.
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