CN109195273B - Constant power control device and constant power control method for LED lamp - Google Patents
Constant power control device and constant power control method for LED lamp Download PDFInfo
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- CN109195273B CN109195273B CN201811258375.2A CN201811258375A CN109195273B CN 109195273 B CN109195273 B CN 109195273B CN 201811258375 A CN201811258375 A CN 201811258375A CN 109195273 B CN109195273 B CN 109195273B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a constant power control device and a constant power control method of an LED lamp.A power supply module rectifies input alternating current and outputs line voltage to a line voltage detection module, and simultaneously outputs power supply voltage to a control module; the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage; and the control module samples according to the detection voltage signal to obtain a corresponding data coding value, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant. The line voltage is detected and sampled to obtain a corresponding data coding value, and the data coding value is used for calculating and outputting a dimming signal to the controlled lamp, so that the working current of the controlled lamp can be adjusted in real time in a software operation control mode when the input voltage is unstable, and the power of the LED lamp is constant while self-excitation cannot be formed in a circuit.
Description
Technical Field
The invention relates to the field of intelligent control, in particular to a constant power control device and a constant power control method for an LED lamp.
Background
In the application of the existing LED lamp, part of lamps realize constant power control in a hardware mode, and part of lamps do not use constant power control; when the alternating voltage rises to cause the power of the lamp to increase, the redundant heat cannot be dissipated to cause the damage of the lamp or cause the reduction of the reliability of the lamp and the shortening of the service life of the lamp.
The lamp for realizing constant power control by using a hardware mode is generally realized by adding a resistance capacitor to a power chip, alternating-current voltage is output to the power chip for sampling after being processed by the resistance capacitor, the power chip regulates lamp current according to the sampled voltage to realize constant power control, and the mode easily forms self-excitation in linear LED application and has higher cost.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a constant power control apparatus and a constant power control method for an LED lamp, which obtain a corresponding data code value by detecting and sampling a line voltage, and output a dimming signal to a controlled lamp by using the data code value to calculate, so that a working current of the controlled lamp can be adjusted in real time by a software operation control mode when an input voltage is unstable, thereby achieving a constant power of the LED lamp, preventing a self-excitation from being formed in a circuit, and reducing a cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant power control device of an LED lamp is connected with an alternating current power supply and a controlled lamp, and comprises: the device comprises a power supply module, a line voltage detection module and a control module; the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module, and simultaneously outputs power supply voltage to the control module; the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage; and the control module samples according to the detection voltage signal to obtain a corresponding data coding value, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant.
In the constant power control device of the LED lamp, the control module comprises a sampling unit, an arithmetic unit and an output unit; the sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value, and the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit; and the output unit outputs a dimming signal to the controlled lamp according to the received operation result and the reference dimming signal.
In the constant power control device of the LED lamp, the detection voltage signal is a stable direct current voltage signal or a periodic voltage signal.
In the constant power control device of the LED lamp, the sampling unit is specifically configured to sample the stable dc voltage signal and convert the stable dc voltage signal into a corresponding data coding value when the detected voltage signal is the stable dc voltage signal; and when the detection voltage signal is a periodic voltage signal, sampling the periodic voltage signal and converting the periodic voltage signal into a corresponding data coding value.
In the constant power control device of the LED lamp, the operation unit is specifically configured to operate the data code value and preset reference data according to a preset algorithm to obtain a dimming parameter, and output the dimming parameter to the output unit.
In the constant power control device of the LED lamp, the output unit is specifically used for obtaining a dimming signal according to the dimming parameter and a preset reference dimming signal and outputting the dimming signal to the controlled lamp.
In the constant power control device of the LED lamp, the operation unit is specifically configured to search for corresponding dimming data in a preset dimming data table according to the data coding value, and output the dimming data to the output unit.
In the constant power control device of the LED lamp, the output unit is specifically configured to convert the dimming data into a dimming signal and output the dimming signal to the controlled lamp.
A constant power control method of an LED lamp comprises the following steps:
the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module;
the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage;
and the control module samples according to the detection voltage signal to obtain a corresponding data coding value, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant.
In the method for realizing the constant power of the LED lamp, the step that the control module samples according to the detection voltage signal to obtain a corresponding data coding value and outputs a dimming signal to the controlled lamp according to the data coding value comprises the following steps:
the sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value;
the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit;
and the output unit outputs a dimming signal to the controlled lamp according to the received operation result and the reference dimming signal.
Compared with the prior art, in the constant power control device and the constant power control method of the LED lamp provided by the invention, the constant power control device of the LED lamp is connected with the ac power supply and the controlled lamp, and includes: the device comprises a power supply module, a line voltage detection module and a control module; the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module, and simultaneously outputs power supply voltage to the control module; the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage; and the control module samples according to the detection voltage signal to obtain a corresponding data coding value, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant. The line voltage is detected and sampled to obtain a corresponding data coding value, and the data coding value is used for calculating and outputting a dimming signal to the controlled lamp, so that the working current of the controlled lamp can be adjusted in real time in a software operation control mode when the input voltage is unstable, the power of the LED lamp is constant, self-excitation cannot be formed in a circuit, and the cost is reduced.
Drawings
Fig. 1 is a block diagram of a constant power control device of an LED lamp according to the present invention;
fig. 2 is a block diagram of a control module in the constant power control apparatus for an LED lamp provided in the present invention;
fig. 3 is a circuit diagram of a constant power control device of an LED lamp provided in the present invention;
fig. 4 is a voltage-current waveform diagram in an embodiment of detecting a voltage signal in a constant-power control device of an LED lamp provided by the present invention as a stable dc voltage signal;
fig. 5 is a voltage-current waveform diagram in an embodiment where a detected voltage signal in the constant power control device of the LED lamp provided by the present invention is a periodic voltage signal;
FIG. 6 is a flow chart of a constant power control method for an LED lamp according to the present invention;
fig. 7 is a flowchart of step S300 in the constant power control method for the LED lamp provided in the present invention.
Detailed Description
In view of the defects that the LED lamp in the prior art is easy to generate self-excitation when the LED lamp realizes the constant power control in a hardware mode of a power supply chip and a resistor capacitor, the invention provides the constant power control device and the constant power control method of the LED lamp.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the constant power control device of the LED lamp provided by the present invention is connected to an ac power supply and a controlled lamp 10, the constant power control device includes a power supply module 11, a line voltage detection module 12 and a control module 13, an ac power is input to an input end of the power supply module 11, an output end of the power supply module 11 is connected to the line voltage detection module 12 and the control module 13, and the line voltage detection module 12, the control module 13 and the controlled lamp 10 are sequentially connected. After the input alternating current is rectified by the power supply module 11, the line voltage is output to the line voltage detection module 12, and meanwhile, the power supply voltage is output to the control module 13; the line voltage detection module 12 outputs a detection voltage signal to the control module 13 according to the line voltage; the control module 13 obtains a corresponding data code value according to the detection voltage signal, outputs a dimming signal to the controlled lamp 10 according to the data code value, and adjusts the working current of the controlled lamp 10 to keep the power thereof constant.
In addition, in the embodiment, the line voltage rectified by the power supply module 11 can also be output to the controlled lamp 10 to supply power to the controlled lamp 10, and certainly, the line voltage rectified by the power supply module 11 can also be accessed to the alternating current through an independent rectifier bridge to supply power to the controlled lamp 10, and the line voltage can be specifically selected according to actual requirements; the other path of the voltage signal outputs a power supply voltage to the control module 13 to supply power to the control module 13, the line voltage detection module 12 outputs a detection voltage signal to the control module 13 according to the converted line voltage, the control module 13 samples and converts the detection voltage signal to obtain a corresponding data code value, and since the detection voltage signal reflects the change of the current input alternating voltage, the data code value obtained after sampling and converting the detection voltage signal also carries the change information of the input alternating voltage, and then outputs a dimming signal to the controlled lamp 10 according to the data code value, preset reference data and a reference dimming signal, and the working current of the controlled lamp 10 is adjusted to keep the power of the controlled lamp constant.
In specific implementation, a reference data is preset in the control module 13, and the setting process of the reference data is that when the input ac voltage is a reference voltage, the control module 13 samples and converts a detection voltage signal output by the line voltage detection module 12 to obtain a data code value, and sets the data code value as the reference data, where the reference voltage is an industry-specified voltage or a self-set voltage, for example, the reference voltage in this embodiment is 220V ac voltage, and in other embodiments, other reference voltages may be adopted to adapt to standard input ac voltages in different regions, such as 110V and the like. When the dimming signal is output, the change information of the current input ac voltage can be obtained according to the data code value and preset reference data, so as to output a dimming signal correspondingly to adjust the working current of the controlled lamp 10, the working current of the controlled lamp 10 and the dimming signal are in a linear relationship, in specific implementation, the reference dimming signal and the dimming signal can both adopt a PWM dimming signal or an analog voltage dimming signal, wherein the reference dimming signal is a PWM dimming signal duty ratio (reference duty ratio) corresponding to the reference data or an analog dimming voltage (reference dimming voltage) corresponding to the reference data, after the change information of the current input ac voltage is obtained according to the data code value and the preset reference data, the change of the current input ac voltage is eliminated by correspondingly adjusting the reference dimming signal, so as to output a dimming signal to the controlled lamp 10, namely, the reference duty ratio or the reference dimming voltage is adjusted and then output to the controlled lamp 10, so that the working current of the controlled lamp 10 is adjusted, the working current of the controlled lamp 10 can be adjusted in real time in a software operation control mode when the input voltage is unstable, the power of the LED lamp is constant, and the influence of self-excitation formed in a circuit on the normal use of the lamp is avoided.
Further, referring to fig. 2, the power supply module 11 includes a rectifier bridge, a first resistor R1, a first diode D1, a zener diode DZ1, a first capacitor C1, a second capacitor C2, and a regulator LDO; the input end of the rectifier bridge is connected with the alternating current input end, and the output end of the rectifier bridge is connected with one end of the first resistor R1, the line voltage detection module 12 and the controlled lamp 10; the other end of the first resistor R1 is connected with the anode of a first diode D1 and the cathode of a voltage stabilizing diode DZ 1; the negative electrode of the first diode D1 is connected with one end of the first capacitor C1 and the input end of the voltage regulator LDO; the output end of the voltage regulator LDO is connected with one end of a second capacitor C2 and the control module 13; the anode of the zener diode DZ1, the other end of the first capacitor C1, the GND terminal of the regulator LDO, and the other end of the second capacitor C2 are all grounded.
In specific implementation, after high-voltage alternating current, for example, 220V/50Hz alternating current voltage is rectified by the rectifier bridge, one path of output line voltage is sent to the line voltage detection module 12 and the controlled lamp 10, so as to provide a detection source for the line voltage detection module 12 and supply power to the controlled lamp 10; the other path of the alternating current is used for converting the high-voltage alternating current into 18V direct current through a first resistor R1 and a voltage stabilizing diode DZ1, the first capacitor C1 is charged after the first capacitor D1 is isolated, then the 18V direct current is reduced to stable 3.3V direct current through a voltage stabilizer LDO and then is output to the control module 13 to supply power to the control module 13, so that the control module 13 has stable working voltage, and the working stability of the whole control device is improved.
Furthermore, the line voltage detection module 12 is a voltage reduction circuit composed of a second resistor R2, a third resistor R3 and a third capacitor C3, one end of the second resistor R2 is connected to the power supply module 11, the other end of the second resistor R2 is connected to one end of the third resistor R3, one end of the third capacitor C3 and the control module 13, and the other end of the third resistor R3 and the other end of the third capacitor C3 are both grounded. The rectified periodic voltage signal is converted into a stable direct current voltage signal with the highest voltage of 3.3V or a periodic voltage signal with the highest voltage of 3.3V through a voltage reduction circuit consisting of a second resistor R2, a third resistor R3 and a third capacitor C3, namely, the detection voltage signal output by the line voltage detection module 12 can be divided into two forms, and the stable direct current voltage signal or the periodic voltage signal can be sampled and converted by the control module 13 to obtain a corresponding data coding value so as to reflect the amplitude of the currently input alternating current voltage.
Specifically, as shown in fig. 2, the control module 13 includes a sampling unit 131, an operation unit 132, and an output unit 133, the sampling unit 131, the operation unit 132, and the output unit 133 are sequentially connected, the sampling unit 131 is further connected to the line voltage detection module 12, and the output unit 133 is further connected to the controlled lamp 10, in this embodiment, the sampling unit 131, the operation unit 132, and the output unit 133 are all integrated in a microcontroller U1, where the sampling unit 131 can be implemented by an ADC (analog-to-digital converter) in the microcontroller U1, that is, a detected voltage signal output by the line voltage detection module 12 is output to an ADC port of the microcontroller U1, the detected voltage signal is sampled by the ADC and then converted into a corresponding data code value, and then the data code value and a preset reference data are operated by the operation unit 132 according to a preset algorithm to output a corresponding operation result, since the current data code value reflects the amplitude of the current input ac voltage, and the preset reference data represents the preset reference voltage amplitude, both the data code value and the reference data are obtained by the sampling unit 131 through the same sampling and data conversion rules, the operation result output by the operation unit 132 after the operation is performed on the current data code value and the reference data according to the preset algorithm can reflect the relationship between the current input ac voltage and the reference voltage, for example, the current input ac voltage is increased or decreased, and the increased or decreased proportional amplitude, and so on, after the operation result is obtained, the output unit 133 outputs the dimming signal to the controlled lamp 10 according to the operation result and the preset reference dimming signal, since the reference dimming signal is the dimming signal corresponding to the base data, which is in a linear relationship with the working current of the controlled lamp 10, when the ac input voltage changes, the power of the controlled lamp 10 can be kept constant by adjusting the working current of the controlled lamp 10, so that the output unit 133 adjusts the preset reference dimming signal according to the relationship between the current input ac voltage and the reference voltage and then outputs the dimming signal, and adjusts the working current of the controlled lamp 10 according to the dimming signal, so that the power of the controlled lamp 10 is always kept constant when the input ac voltage fluctuates, and the reliability and the service life of the lamp are improved.
In specific implementation, the detection voltage signal can be divided into two forms, so that the sampling unit 131 has corresponding sampling modes for the detection voltage signals of the two different forms, one is to sample the stable dc voltage signal and convert the stable dc voltage signal into a corresponding data code value when the detection voltage signal is a stable dc voltage signal, that is, when the output detection voltage signal is a stable dc voltage signal, the amplitude of the output detection voltage signal is stable, and the output detection voltage signal is directly converted into a corresponding data code value after sampling the stable dc voltage signal by the sampling unit 131; the other is that when the detected voltage signal is a periodic voltage signal, the periodic voltage signal is sampled and converted into a corresponding data code value, that is, when the output detected voltage signal is a periodic voltage signal, the sampling unit 131 samples the periodic voltage signal and converts the periodic voltage signal into a corresponding data code value, that is, when the periodic voltage signal is adopted, the sampling unit 131 samples and converts into a group of periodically changing data code values, so that the sampling unit 131 can perform corresponding sampling conversion according to two different detected voltage signals to output the data code value for the operation unit 132 to perform subsequent calculation and output, thereby implementing constant power control with high efficiency, stability and no self-excitation.
Further, the operation unit 132 has at least two modes during the calculation, in an embodiment where the detected voltage signal is a stable dc voltage signal, the operation unit 132 is specifically configured to calculate the data code value and preset reference data according to a preset algorithm to obtain the dimming parameter, and during the specific implementation, the operation unit 132 is configured to calculate a ratio Δ V1 between the data code value and the reference data, and output the ratio Δ V1 to the output unit 133. In this embodiment, the dimming parameter is a ratio Δ V1 of the data code value to the reference data, and the operation unit 132 calculates a ratio Δ V1 of the sampled data code value to the reference data, i.e. Δ V1= (data code value/reference data), so that the ratio Δ V1 reflects a ratio of the current input ac voltage to the reference voltage, and P = U × I is calculated according to a power calculation formula, and if the input is the reference voltage, P = U = I0*I0Wherein U is0Is a reference voltage, I0The reference current is the working current of the current controlled lamp 10 corresponding to the reference data, and if the input ac voltage fluctuates, the current input ac voltage U is1=ΔV1* U0That is, Δ V1 indicates that the current input ac voltage is increased or decreased relative to the reference voltage, and the corresponding power P = Δ V1U0* I0From this relationship, it can be seen that to achieve constant power, the operating current of the controlled lamp 10 is adjusted to I0(1/Δ V1), in this embodiment, the output unit 133 is specifically configured to calculate a dimming signal according to the dimming parameter and a preset reference dimming signal, specifically, multiply the reference dimming signal by 1/Δ V1 to obtain a dimming signal, and output the dimming signal to the controlled lamp 10, where the operating current of the controlled lamp 10 is in a linear relationship with the dimming signal, so that if the current power P = Δ V1U is present0* I0Then, the reference duty cycle or the reference dimming signal is multiplied by 1/Δ V1 and then output to the controlled lamp 10, so that the working current I of the controlled lamp 10 is enabled1= I01/Δ V1, and further adjusting the power P of the controlled light fixture 10 to remain as U0*I0To achieve the power constancy of the controlled lamp 10, the waveforms of the voltage and the current in this embodiment are shown in fig. 4.
In another embodiment in which the detected voltage signal is a periodic voltage signal, the sampling unit 131 samples the periodic voltage signal to obtain a corresponding data code value with periodic variation, and the operation unit 132 searches a preset dimming data table according to the data code value to obtain corresponding dimming data, that is, the operation unit 132 inputs the data code value into the preset dimming data table to obtain a set of dimming data with periodic variation, and outputs the dimming data to the output unit 133. In this embodiment, the data in the preset dimming data table is preset and stored dimming data corresponding to the controlled lamp 10 at different input ac voltages and with constant power, that is, each input ac voltage in the table corresponds to one dimming data for adjusting the working current of the controlled lamp 10, so that the power of the controlled lamp 10 is kept constant. When the detection voltage signal is a periodic voltage signal, because the voltage change in each period may not be consistent, and the working current of the controlled lamp 10 cannot be adjusted to a stable value through a uniform dimming parameter, so that constant power is realized, in this embodiment, the operation unit 132 directly calls the dimming data in the pre-stored dimming data table according to the data code value corresponding to each period voltage, that is, obtains a group of periodically changing dimming data according to the periodically changing data code value, and then converts the dimming data through the output unit 133 to obtain a dimming signal and output the dimming signal to the controlled lamp 10, adjusts the corresponding change of the working current of the controlled lamp 10, and further adjusts the power of the controlled lamp 10 to keep constant. The voltage and current waveforms in this embodiment are shown in FIG. 5.
Based on the constant power control device of the LED lamp, the present invention also provides a constant power control method of the LED lamp, as shown in fig. 6, which includes the following steps:
s100, a power supply module rectifies input alternating current and outputs line voltage to a line voltage detection module;
s200, the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage;
s300, the control module obtains a corresponding data coding value according to the detection voltage signal, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant.
As shown in fig. 7, the step S300 includes:
s301, a sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value;
s302, the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit;
and S303, the output unit outputs a dimming signal to the controlled lamp according to the received operation result.
In summary, in the constant power control apparatus and the constant power control method for an LED lamp provided by the present invention, the constant power control apparatus for an LED lamp is connected to an ac power supply and a controlled lamp, and includes: the device comprises a power supply module, a line voltage detection module and a control module; the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module, and simultaneously outputs power supply voltage to the control module; the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage; and the control module samples according to the detection voltage signal to obtain a corresponding data coding value, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant. The line voltage is detected and sampled to obtain a corresponding data coding value, and the data coding value is used for calculating and outputting a dimming signal to the controlled lamp, so that the working current of the controlled lamp can be adjusted in real time in a software operation control mode when the input voltage is unstable, the power of the LED lamp is constant, self-excitation cannot be formed in a circuit, and the cost is reduced.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (6)
1. A constant power control device of an LED lamp is connected with an alternating current power supply and a controlled lamp, and is characterized in that the constant power control device comprises: the device comprises a power supply module, a line voltage detection module and a control module; the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module, and simultaneously outputs power supply voltage to the control module; the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage; the control module obtains a corresponding data coding value according to the detection voltage signal, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant;
the control module comprises a sampling unit, an arithmetic unit and an output unit; the sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value, and the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit; the output unit outputs a dimming signal to the controlled lamp according to the received operation result;
the operation unit is specifically used for obtaining a dimming parameter after the data coding value and preset reference data are operated according to a preset algorithm, and outputting the dimming parameter to the output unit;
the operation unit is used for calculating the ratio of the data coding value to the reference data, and the dimming parameter is the ratio of the data coding value to the reference data;
the output unit is used for multiplying the reference dimming signal by the reciprocal of the ratio of the data coding value to the reference data to obtain a dimming signal and outputting the dimming signal to the controlled lamp; the reference dimming signal is a dimming signal corresponding to the reference data;
the line voltage detection module is a voltage reduction circuit consisting of a second resistor, a third resistor and a third capacitor.
2. The constant power control device of claim 1, wherein the detection voltage signal is a steady dc voltage signal or a periodic voltage signal.
3. The constant-power control device of the LED lamp according to claim 2, wherein the sampling unit is specifically configured to sample the stable dc voltage signal and convert the stable dc voltage signal into a corresponding data encoding value when the detected voltage signal is the stable dc voltage signal; and when the detection voltage signal is a periodic voltage signal, sampling the periodic voltage signal and converting the periodic voltage signal into a corresponding data coding value.
4. The constant power control device of the LED lamp according to claim 1, wherein the output unit is specifically configured to obtain a dimming signal according to the dimming parameter and a preset reference dimming signal, and output the dimming signal to the controlled lamp.
5. A constant power control method of an LED lamp is characterized by comprising the following steps:
the power supply module rectifies input alternating current and outputs line voltage to the line voltage detection module;
the line voltage detection module outputs a detection voltage signal to the control module according to the line voltage;
the control module obtains a corresponding data coding value according to the detection voltage signal, outputs a dimming signal to the controlled lamp according to the data coding value, and adjusts the working current of the controlled lamp to keep the power of the controlled lamp constant;
the control module comprises a sampling unit, an arithmetic unit and an output unit; the sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value, and the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit; the output unit outputs a dimming signal to the controlled lamp according to the received operation result;
the operation unit is used for operating the data coding value and preset reference data according to a preset algorithm to obtain a dimming parameter, and outputting the dimming parameter to the output unit;
the operation unit calculates the ratio of the data coding value to the reference data, and the dimming parameter is the ratio of the data coding value to the reference data;
the output unit is used for multiplying the reference dimming signal by the reciprocal of the ratio of the data coding value to the reference data to obtain a dimming signal and outputting the dimming signal to the controlled lamp; the reference dimming signal is a dimming signal corresponding to the reference data;
the line voltage detection module is a voltage reduction circuit consisting of a second resistor, a third resistor and a third capacitor.
6. The constant power control method of the LED lamp according to claim 5, wherein the step of the control module obtaining a corresponding data code value according to the detection voltage signal sampling, and outputting a dimming signal to the controlled lamp according to the data code value comprises:
the sampling unit samples the detection voltage signal and converts the detection voltage signal into a corresponding data coding value;
the operation unit operates the data coding value according to a preset algorithm and outputs a corresponding operation result to the output unit;
and the output unit outputs a dimming signal to the controlled lamp according to the received operation result.
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