CN109548239B - LED lamp power supply control device with virtual synchronous machine response mechanism - Google Patents

LED lamp power supply control device with virtual synchronous machine response mechanism Download PDF

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CN109548239B
CN109548239B CN201811523765.8A CN201811523765A CN109548239B CN 109548239 B CN109548239 B CN 109548239B CN 201811523765 A CN201811523765 A CN 201811523765A CN 109548239 B CN109548239 B CN 109548239B
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led lamp
module
voltage
power grid
component
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CN109548239A (en
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徐青山
王栋
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Southeast University
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Southeast University
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • 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 an LED lamp power supply control device with a virtual synchronous machine response mechanism, which receives an ambient light intensity signal measured by a light intensity sensor, a power grid and LED lamp power supply related signal measured by a voltage sensor and a wireless scheduling instruction transmitted by an upper energy scheduling system, makes comprehensive judgment based on the information, generates an instruction signal for adjusting an LED lamp power supply, and respectively transmits the instruction signal to a PFC module and a DC/DC module which are used for converting power grid alternating current into LED lamp direct current power supply. The invention can improve the working efficiency of the LED power supply and reduce unnecessary energy consumption; meanwhile, actively participate in the response of the power grid side, so that the stability of the power grid is improved; modern digital intelligent scheduling can be realized, and the accuracy and efficiency of intelligent scheduling are improved.

Description

LED lamp power supply control device with virtual synchronous machine response mechanism
Technical Field
The invention relates to a power supply control technology of an LED lamp, in particular to a power supply control device of an LED lamp with a virtual synchronous machine response mechanism.
Background
In recent years, LED lamps have been widely popularized and applied due to their advantages of low loss, long life, green and energy saving. The driving power supply serving as the heart of the LED lamp becomes an important component of the popularization and development of the LED illumination at present. With the development of science and technology, the LED power supply is rapidly developed, and at the present stage, a constant-current type power supply and a voltage-stabilizing type power supply mainly exist, so that the basic power supply of the LED power supply is only guaranteed, and the requirements of actively participating in frequency modulation of a smart power grid and the like are not involved, so that the intelligent requirements of the power grid and users cannot be responded.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above problems in the prior art, the present invention provides an LED lamp power control apparatus with a virtual synchronous machine response mechanism.
The technical scheme is as follows: the LED lamp power control device comprises a voltage sensor, a light intensity sensor, a wireless transmission module and a DSP controller; the voltage sensor measures the voltage at the side of the power grid, the input current at the side of the power grid, the direct current voltage output by the output power factor correction PFC module and the current of the LED lamp, and forwards the direct current voltage and the current of the LED lamp to the DSP controller; the PFC module converts an alternating current power supply into a direct current power supply of the DC/DC module, and the DC/DC module provides power for the LED lamp; the light intensity sensor measures the ambient light intensity and forwards the ambient light intensity to the DSP controller; the wireless transmission module forwards a wireless scheduling instruction of the upper-layer energy scheduling system to the DSP controller; the DSP controller is configured to: calculating the power grid frequency based on the voltage at the power grid side, and generating a first signal and a first indicated value for adjusting the brightness of the LED lamp based on the power grid frequency; generating a second signal and a second indication value for adjusting the brightness of the LED lamp based on the intensity of the ambient light; the method comprises the steps that a voltage sensor is used for measuring voltage at a power grid side, input current at the power grid side, direct current voltage output by a Power Factor Correction (PFC) module and an LED lamp current analysis wireless scheduling instruction, and a third signal and a third indicated value for adjusting the brightness of an LED lamp are generated; first control instructions are generated for controlling the DC/DC module based on the first, second and third signals for adjusting the brightness of the LED lamp and the respective indication values.
Further, the DSP controller generates a second control instruction according to the voltage at the power grid side, the input current at the power grid side and the direct current voltage output by the PFC module, and the second control instruction is used for controlling the PFC module.
Furthermore, the DSP controller comprises an analog-to-digital converter (ADC), a serial port and a virtual synchronous machine response mechanism control module; the ADC receives analog signals of the measurement results forwarded by the voltage sensor and the light intensity sensor and converts the analog signals into corresponding digital signals; the serial port is used for realizing the communication between the wireless transmission module and the virtual synchronous machine response mechanism control circuit; the virtual synchronous machine response mechanism control module comprises a phase-locked loop PLL component, a direct proportion component, an inverse proportion component, an analysis instruction component, an instruction priority selection component, a PFC module control component and a DC/DC module control component; the PLL component calculates the grid frequency and a grid-related sinusoidal signal based on the digital signal of the grid-side voltage; the inverse proportion component generates a first signal and a first indicating value for adjusting the brightness of the LED lamp based on the power grid frequency; the direct proportion component generates a second signal and a second indication value for adjusting the brightness of the LED lamp based on the digital signal of the ambient light intensity; the analysis instruction component is used for analyzing a wireless scheduling instruction by combining the voltage at the power grid side, the input current at the power grid side, the direct current voltage output by the PFC module and the LED lamp current so as to generate a third signal and a third indication value for adjusting the LED lamp brightness; the command priority selection component generates an LED lamp reference current based on first, second and third signals for adjusting the brightness of the LED lamp; the DC/DC module control component generates the first control instruction based on the LED lamp reference current; the PFC module control component generates the second control instruction based on the digital signals of the grid-side voltage, the grid-side input current and the DC voltage output by the PFC module, and the sinusoidal signal.
Further, each component in the virtual synchronous machine response mechanism control module and the function thereof are realized by programming the programmable circuit.
Further, the first and second control commands are PWM pulse signals for controlling power devices in the PFC module and the DC/DC module.
Further, the third indication value is always higher than the first and second indication values; the first indication value increases with the increase of the grid frequency; the second indication increases with increasing ambient light intensity.
Has the advantages that: compared with the prior art, the LED lamp power supply control device and the LED lamp power supply control method have the advantages that: 1. the light ray self-adaption can be realized, so that the aim of energy conservation is fulfilled; 2. the frequency of the power grid can be actively responded, and the stability of the power grid is improved; 3. the wireless transmission module is used for uploading signals and receiving instructions of a scheduling system, so that the accuracy and efficiency of intelligent scheduling are improved, and the remote control of the power supply of the LED lamp can be realized; 4. through the setting of the priority, the continuity of power adjustment can be optimized; 5. the virtual synchronous machine response mechanism and the priority setting are realized only by software, the original hardware circuit is not required to be changed, and the cost is low.
Drawings
FIG. 1 is a signal diagram illustrating a prior art power supply to an LED via a power grid;
FIG. 2 is a structural diagram of a power control device of an LED lamp according to the present invention;
FIG. 3 is a schematic diagram illustrating a control mechanism of a virtual synchronous machine in the power control apparatus of an LED lamp according to the present invention;
FIG. 4 is a schematic diagram of the operation of a phase locked loop assembly of the present invention;
fig. 5 is a schematic diagram of the operation of the PFC module control assembly of the present invention;
fig. 6 is a schematic diagram of the operation of the DC/DC module control assembly of the present invention.
Wherein:
Vligvoltage signals after light intensity conversion are represented;
Vinrepresenting a grid-side voltage signal;
Iinrepresenting a grid-side input current signal;
Vdca DC voltage signal representative of the PFC output;
Ioa current signal representative of the LED lamp;
Vdc*represents the output dc voltage reference signal;
Iin*an input current command signal indicative of a net side;
Io*a current command signal indicative of the LED lamp;
ω s represents the angular frequency of the grid-side voltage.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the current LED lamp power is generally supplied by an AC power supply of a power grid, and is subjected to a Totem Pole PFC (Totem Pole PFC) module to obtain a DC power supply of a DC/DC module, and then the DC/DC module converts the DC/DC power supply into a suitable voltage and current for supplying power to the LED lamp.
In the invention, V needs to be collected for effectively controlling the voltage and the current of the power supply of the LED lampin、Iin、VdcAnd Io. Wherein, VinAnd VdcCan be directly acquired by a voltage sensor, IinAnd IoThe voltage on the corresponding load can be acquired by the voltage sensor and then calculated by ohm's law.
Referring to fig. 2, the power control device for an LED lamp of the present invention includes a voltage sensor, a light intensity sensor, a wireless transmission module, and a DSP controller. Voltage sensor for collecting Vin、Iin、VdcAnd IoAnd converted into a low-voltage signal to be sent to the DSP controller. The light intensity sensor is used for measuring the light intensity of the ambient light, converting the measured light intensity into a low-voltage signal and sending the low-voltage signal to the DSP controller for processing. The wireless transmission module is used for enabling the DSP controller to receive a wireless scheduling instruction transmitted by the upper energy scheduling system through the serial port so as to analyze the instruction information through a software protocol. Meanwhile, the wireless transmission module can upload energy scheduling response information of the DSP controller and running information of the LED power supply, and comprehensive analysis of an upper-layer energy scheduling system is facilitatedAnd gives instructions. The DSP controller makes comprehensive analysis and judgment based on low-voltage signals sent by the voltage sensor and the light intensity sensor and wireless scheduling instructions transmitted by the wireless transmission module, and respectively generates PWM signals for controlling the PFC module and the DC/DC module so as to control power devices (such as GaN HEMT drivers) in the PFC module and the DC/DC module through the PWM signals, thereby controlling the power supply of the LED lamp and realizing the adjustment of the brightness of the LED lamp.
As shown in fig. 3, the DSP controller includes an analog-to-digital converter ADC, a phase-locked loop PLL component, a PFC module control component, a direct proportion component, an inverse proportion component, a parse instruction component, an instruction priority selection component, and a DC-DC control component. Wherein the ADC receives Vlig、Vin、Iin、VdcAnd IoConverted into digital signals and then output to other components in the DSP controller. For example, VinIs input to the PLL component to calculate the grid frequency ω s and outputs a grid frequency signal ω s to the inverse proportional component. The inverse proportion component outputs a first adjusting signal for adjusting the brightness of the LED lamp and a corresponding first indicating value based on the power grid frequency omegas, and the larger the value of omegas is, the larger the first indicating value is (meaning that the priority of the first adjusting signal is higher), and the lower the first indicating value is. VligIs output to a proportional component, which is based on VligOutputting a second adjusting signal for adjusting the brightness of the LED lamp and a corresponding second indicating value, and VligThe stronger the intensity of the corresponding ambient light the lower the second indication value (meaning the lower the priority of the second adjustment signal). In addition, a wireless scheduling instruction from the upper-layer energy scheduling system is received by a serial port of the DSP controller through the wireless transmission module and then is sent to the analysis instruction component, and the analysis instruction component obtains and outputs a third signal for adjusting the brightness of the LED lamp and a corresponding third indicated value after being analyzed through a software protocol. The instruction priority selection component receives first, second and third adjusting signals for adjusting the brightness of the LED lamp and corresponding indicating values, compares the indicating values, and outputs the reference current I of the LED lamp according to the adjusting signal corresponding to the maximum indicating valueo*To the DC/DC module control assembly, the signal generated by the DC/DC module control assembly is used to perform the operations on the DC/DC module of FIG. 1And (5) controlling. In addition, the PLL component also outputs a sine signal sin θ to the PFC module control component. The PFC module control component is based on the sinusoidal signal and V obtained from the ADCdc、IinAnd VinA control signal is generated for controlling the Totem-pol PFC block of fig. 1.
In particular, the third indicator value (corresponding to the wireless scheduling instruction) may be set to be always higher than the second indicator value (corresponding to the ambient light intensity) and the first indicator value (corresponding to the grid frequency) in a normal case. The first indicator value depends on the magnitude of ω s and the second indicator value depends on VligThe size of (2). The indication value of the third instruction may be set to a constant. By setting in this way, flexible control of the LED power supply can be achieved as required, namely: when the power grid frequency is stable and a wireless scheduling instruction is not received, the LED brightness is preferably adjusted according to the change of the ambient light intensity (for example, the LED lamp brightness is reduced when the ambient light is strong, otherwise, the LED lamp brightness is increased); when the power grid frequency has large deviation from the rated frequency, the change of the power grid frequency is considered preferentially; and when the wireless scheduling instruction is received, preferentially executing the scheduling instruction.
As shown in fig. 4, the PLL component in the DSP controller includes four sub-modules of Second Order Generalized Integral (SOGI), PARK transform, LPF filtering, and Voltage Controlled Oscillator (VCO). Second-order generalized integral (SOGI) mainly converts a single-phase voltage signal Uin into 2 mutually perpendicular α β coordinate signals, wherein the α coordinate signals keep the same phase with the original Uin; the PARK transformation converts the α β coordinate signals into 2 mutually perpendicular dq coordinate signals rotating along with the synchronous coordinate axis; the q-axis signal is filtered by an LPF filter to remove a high-frequency signal, and only the direct-current component of the voltage synchronous signal at the reaction network side is reserved in the output of the q-axis signal; the VCO sub-module is connected to the direct current component, the frequency of a power grid is output after a proportion link is carried out, and the virtual synchronous machine response mechanism control module gives a reference current for automatically adjusting the brightness LED lamp power supply according to the frequency; in addition, the tracking of the voltage phase at the network side is realized after the frequency of the output power grid passes through an integral link, and finally, after simple trigonometric function calculation, a sine signal sin theta for PFC control is output to a PFC module control assembly, and a cosine signal cos theta for PARK conversion is generated.
The PFC module control component is used for controlling the on-off of a power device in the PFC module so as to realize the voltage stabilization of a direct current side, namely, the power balance of a load side and a network side. As shown in fig. 5, the PFC module control component includes 2 links of voltage control and current control, where the voltage control is an outer loop and the current control is an inner loop, and the control speed of the inner loop is faster than that of the outer loop. The voltage loop is driven by a DC voltage UdcAnd setting a reference value Udc*The difference comparison link and the PI control link are formed, and the output of the difference comparison link and the PI control link is the amplitude of a current loop reference signal; the product of the voltage loop output and the sine signal output by the software phase-locked loop forms the input reference signal I of the current loopin*Then IinAnd Iin*And (4) making a difference value, inputting the difference value to a PR control link, finally outputting a duty ratio signal to a PWM module by the PR control link, and outputting a PWM pulse signal by the PWM module to control a power device in the PFC module.
As shown in FIG. 6, the DSP controller receives I from the control module of the virtual synchronous machine response mechanismo*Then, I is mixedo*With actual measurement of the LED lamp current IoAnd forming a difference value comparison link, outputting a duty ratio instruction through a PI control link, converting the duty ratio instruction into a PWM pulse signal of a DC/DC module for providing a direct current power supply for the LED lamp by a PWM module, controlling the on-off of a power device, and finally realizing the closed-loop control of the brightness of the LED lamp.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (4)

1. A power supply control device of an LED lamp is characterized by comprising a voltage sensor, a light intensity sensor, a wireless transmission module and a DSP controller;
the voltage sensor measures the voltage at the side of the power grid, the input current at the side of the power grid, the direct current voltage output by the output power factor correction PFC module and the current of the LED lamp, and forwards the direct current voltage and the current of the LED lamp to the DSP controller; the PFC module converts an alternating current power supply into a direct current power supply of the DC/DC module, and the DC/DC module provides power for the LED lamp;
the light intensity sensor measures the ambient light intensity and forwards the ambient light intensity to the DSP controller;
the wireless transmission module forwards a wireless scheduling instruction of the upper-layer energy scheduling system to the DSP controller;
the DSP controller is configured to: calculating the power grid frequency based on the voltage at the power grid side, and generating a first signal and a first indicated value for adjusting the brightness of the LED lamp based on the power grid frequency; generating a second signal and a second indication value for adjusting the brightness of the LED lamp based on the intensity of the ambient light; the method comprises the steps that a voltage sensor is used for measuring voltage at a power grid side, input current at the power grid side, direct current voltage output by a Power Factor Correction (PFC) module and an LED lamp current analysis wireless scheduling instruction, and a third signal and a third indicated value for adjusting the brightness of an LED lamp are generated; generating a first control instruction based on the first, second and third signals for adjusting the brightness of the LED lamp and the respective indicated values, for controlling the DC/DC module;
the DSP controller also generates a second control instruction according to the voltage at the power grid side, the input current at the power grid side and the direct current voltage output by the PFC module, and is used for controlling the PFC module;
the DSP controller comprises an analog-to-digital converter (ADC), a serial port and a virtual synchronous machine response mechanism control module;
the ADC receives analog signals of the measurement results forwarded by the voltage sensor and the light intensity sensor and converts the analog signals into corresponding digital signals;
the serial port is used for realizing the communication between the wireless transmission module and the virtual synchronous machine response mechanism control module;
the virtual synchronous machine response mechanism control module comprises a phase-locked loop PLL component, a direct proportion component, an inverse proportion component, an analysis instruction component, an instruction priority selection component, a PFC module control component and a DC/DC module control component;
the PLL component calculates the grid frequency and a grid-related sinusoidal signal based on the digital signal of the grid-side voltage;
the inverse proportion component generates a first signal and a first indicating value for adjusting the brightness of the LED lamp based on the power grid frequency;
the direct proportion component generates a second signal and a second indication value for adjusting the brightness of the LED lamp based on the digital signal of the ambient light intensity;
the analysis instruction component is used for analyzing a wireless scheduling instruction by combining the voltage at the power grid side, the input current at the power grid side, the direct current voltage output by the PFC module and the LED lamp current so as to generate a third signal and a third indication value for adjusting the LED lamp brightness;
the instruction priority selection component generates an LED lamp reference current based on the first, second and third signals for adjusting the brightness of the LED lamp and the magnitude of the respective indicated values;
the DC/DC module control component generates the first control instruction based on the LED lamp reference current;
the PFC module control component generates the second control instruction based on the digital signals of the grid-side voltage, the grid-side input current and the DC voltage output by the PFC module, and the sinusoidal signal.
2. The power supply control device for the LED lamp according to claim 1, wherein each component in the virtual synchronous machine response mechanism control module and the function thereof are realized by programming a programmable circuit.
3. The power control device of the LED lamp according to claim 1, wherein the first and second control commands are PWM pulse signals for controlling power devices in the PFC module and the DC/DC module, respectively.
4. The power control device of the LED lamp according to claim 1, wherein the third indication value is always higher than the first and second indication values; the first indication value increases with the increase of the grid frequency; the second indication increases with increasing ambient light intensity.
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