CN109257851A - A kind of LED intelligent dimming drive system - Google Patents

Abstract

A kind of intelligent LED dimming drive system is disclosed in the present invention, drive module is dimmed including intensity of illumination detection module, rpyroelectric infrared module, control core module, EMI filter module, APFC module and PWM, the kernel control module is separately connected intensity of illumination detection module, rpyroelectric infrared module and PWM light modulation drive module, and the PWM light modulation drive module is connected to LED light string.The present invention is using intensity of illumination detection module, rpyroelectric infrared module, control core module, EMI filter module, APFC module and PWM light modulation drive module as operational module, realize the intelligentized control method to LED light, it, which is controlled, stablizes, control effect is good, and the elements such as actuator power factor, constant current accuracy, Electro Magnetic Compatibility, constant pressure precision, transfer efficiency have all reached high level.

Description

A kind of LED intelligent dimming drive system

Technical field

The present invention relates to signal light control field, in particular to a kind of LED intelligent dimming drive system.

Background technique

Due to oil, coal, natural gas etc. rely generation the energy it is non-renewable, and being mentioned with people's living standard Height, the consumption energy is more and more per capita, leads to the unprecedented energy crisis of facing mankind, and environmental protection tide rises, environmental protection Have become the common recognition of the mankind.American National Environmental Protection Agency at the beginning of the last century 90's proposes green illumination, and definition is to pass through The Lighting Design of science, use is high-efficient, safety and performance is stable and the service life is long electric lighting product, improves and improves The quality and condition of people's life, working and learning, to create an efficient, safe, comfortable, economic and beneficial environment and fill The illumination of the existing modern civilization of fission.Green Lighting Project require lighting energy saving, be not traditional energy conservation, this The objective proposed in Chinese " Green Lights Promotion Project scheme " has been clearly described, in order to meet to lighting quality and view Feel the requirements at the higher level of environmental condition, so energy conservation cannot be simply realized by reducing lighting criteria, but will be sufficiently with the modern times Technological means improve designs quality and orientation, are realized with illuminating equipment efficiency is improved.Gradually with people's environmental consciousness Ground enhancing, national governments start the problems such as paying attention to the high power consumption and waste pollution of conventional illumination device, therefore numerous and confused investment is big The new environmentally friendly light source of the money of amount, material resources, manpower research and development.Currently, LED illumination industry is increased in recent years with 40% speed in the world It is long.Wherein have the LED illumination of the title of " green illumination light source ", with its it is original it is energy saving, non-maintaining, the service life is long, easy to control and ring The features such as guarantor, meets green illumination, has become the direction that various countries actively develop.It makes a general survey of China and possesses huge semiconductor at present Illumination market, it is contemplated that the development of national economy level and its scientific and technological level a variety of factors compare with some developed countries, though Right switch lighting scale is huger, whole development level or relatively backward, and also needs to improve and add in technical aspect By force.As urbanization, industrialization and globalization process are constantly accelerated, environmental problem becomes increasingly severe.The whole world is short at present The scarce energy tails off increasingly, and for this status, energy conservation and environmental protection has been the main strategic direction of world today's every profession and trade development.? In lighting area, LED is solid-state semiconductor lighting source of new generation, has the characteristics that high photosynthetic efficiency, long-life, energy conservation and environmental protection. Wherein the performance of LED driver directly affects performance and the service life of lamp.The mode of LED driving mainly has current constant mode and constant pressure LED driver power factor, constant current accuracy, Electro Magnetic Compatibility, constant pressure precision, transfer efficiency etc. are wanted in mode, domestic and international market Ask higher, a LED driver of good performance must consider these factors.The drive efficiency of existing market such as 12V/120W It is undesirable, a kind of LED intelligent dimming drive system is developed hereby.

Summary of the invention

It is an object of the invention to solve the problem in above-mentioned technology, a kind of LED intelligent dimming drive system is provided, The system using intensity of illumination detection module, rpyroelectric infrared module, control core module, EMI filter module, APFC module and PWM dims drive module as operational module, realizes the intelligentized control method to LED light, and control is stablized, and control effect is good, The elements such as its actuator power factor, constant current accuracy, Electro Magnetic Compatibility, constant pressure precision, transfer efficiency have all reached high water It is quasi-.

In order to solve the above technical problems, The technical solution adopted by the invention is as follows:

A kind of intelligent LED dimming drive system, including intensity of illumination detection module, rpyroelectric infrared module, control core Module, EMI filter module, APFC module and PWM dim drive module, and the kernel control module is separately connected intensity of illumination Detection module, rpyroelectric infrared module and PWM dim drive module, and the PWM light modulation drive module is connected to LED light string.

Further, as a preferred technical solution, the APFC module be connected respectively to PWM light modulation drive module and EMI filter module, the EMI filter module connect 220V AC power source.

Further, the kernel control module is also singly connected with power module as a preferred technical solution,.

Further, the environment illumination intensity detection circuit module includes that illumination is strong as a preferred technical solution, Detection circuit is spent, the intensity of illumination detection circuit includes concatenated insurance resistance and photo resistance, and the insurance resistance connects Connect 3V3 power supply, the photo resistance other end ground connection.

Further, the control core module includes single-chip microcontroller as a preferred technical solution, the single-chip microcontroller Including Flash program memory and 10 analog-digital converters.

Possessed by of the invention the utility model has the advantages that

The present invention using intensity of illumination detection module, rpyroelectric infrared module, control core module, EMI filter module, APFC module and PWM light modulation drive module realize the intelligentized control method to LED light, control is stablized, control as operational module Effect processed is good, and the elements such as actuator power factor, constant current accuracy, Electro Magnetic Compatibility, constant pressure precision, transfer efficiency all reach High level.

Detailed description of the invention

Fig. 1 is structure of the invention block diagram.

Specific embodiment

The present invention is further illustrated in the following with reference to the drawings and specific embodiments.

Embodiment 1

A kind of intelligent LED dimming drive system, including intensity of illumination detection module, rpyroelectric infrared module, control core Module, EMI filter module, APFC module and PWM dim drive module, and the kernel control module is separately connected intensity of illumination Detection module, rpyroelectric infrared module and PWM dim drive module, and the PWM light modulation drive module is connected to LED light string, The APFC module is connected respectively to PWM light modulation drive module and EMI filter module, the EMI filter module connection 220V AC power source, the kernel control module are also singly connected with power module, and the environment illumination intensity detects electricity Road module includes intensity of illumination detection circuit, and the intensity of illumination detection circuit includes concatenated insurance resistance and photosensitive electricity Resistance, the insurance resistance connect 3V3 power supply, and the photo resistance other end ground connection, the control core module includes single Piece machine, the single-chip microcontroller include Flash program memory and 10 analog-digital converters.

When work, 220VAC is connected, intensity of illumination detection circuit acquires the intensity of illumination in environment, then red by pyroelectricity Outer mold piece detects whether someone, and the received information of single-chip microcontroller processing changes the bright of LED light finally by PWM dimming driving circuit Degree.The time ratio that PWM control module is turned on and off by control switch pipe is out to reach output burning voltage purpose Powered-down source working method is realized the control to MOSFET and IC by pulse width modulation and forms Switching Power Supply.It mainly has Four kinds of modulation systems mainly only introduce the PWM mode being commonly used here.The present invention is integrated using PWM controller.PWM Mode is to set the pulse signal cycle that occurs on power switch transistor grid first, then de-regulation pulse signal duty ratio Size, and then control power switch tube turn-on time to change the average current passed through in converter, realize to output power with Output voltage control effect.The module compares reference signal and feedback signal difference and the internal sawtooth wave occurred, exports The square-wave signal of constant frequency change width realizes that switch tube on-off controls purpose all the way, can rapidly adjust according to load The turn-on time of switching tube obtains stable voltage.Because it has small output ripple voltage, high linearity and high voltage adjustment Rate, and be suitable for the control model application of electric current and voltage, therefore more be used in the case where demand low noise.Accidentally When poor amplified signal value is lower than sawtooth signal value, comparator exports low level, then exports high level on the contrary.Pulse frequency is not Become, and pulse width changes with the variation of error signal.PWM controller is amplified by PWM comparator, error voltage The usually used control circuits such as device, a reference source and protection circuit, which are integrated in a chip, to be formed, and has good electromagnetic compatibility Property.Environment illumination intensity detection module is photo resistance using core devices.Incident ray power difference causes its resistance value Variation.Under relatively stronger illumination condition, resistance value can several hundred to changing within the scope of several thousand ohms, under dark situations, Its resistance value is 1~10M Ω.Human eye is close to the response and photo resistance of 0.4~0.76um of visible light to the sensibility of light, people The light that eye is experienced all can make its resistance value change.Different change in resistance is transformed into different voltage and become by this module Change, be transmitted to STM8S single-chip microcontroller voltage pin and be compared and treated, in this, as the foundation of PWM light modulation.

Preferably, EMI is filtered, and module includes electromagnetic interface filter, and power grid interference takes equipment to by power supply line, is detached from equipment There is du/dt and di/dt of the electromagnetic interference from switching device in normal working condition, equipment.So must power supply into EMI FILTER is added at line, this filter is low-pass filter, and therefore, the main function of EMI has inhibition AC network In influence of the High-frequency Interference to equipment and inhibit interference of the equipment to AC network.The EMI points of interference have DM EMI With two class of common mode interference.Common mode interference is that the potential difference having between any current-carrying conductor with referring to is mainly manifested in middle line, fire Line and safely between.DM EMI is existing potential difference between two current-carrying conductors.Be mainly manifested in middle line and firewire it Between.The filter of capacitor and inductance composition is electromagnetic interface filter, is arranged after mains electricity input end, electromagnetic interface filter only allows power frequency to believe Number pass through, filter out high frequency noise signal.

Preferably, PWM light adjusting circuit controls power switch under LED light using pwm signal and opening and turning off, to change Average output current reaches the control to LED light brightness.The core of PWM light adjusting circuit is light modulation chip, using MAXIC public affairs The chip MT7201C+, MT7201C+ of department's production are the chips of a decompression constant current driven.MT7201C+ input voltage exists Between 6V~50V.MT7201C+ is internally integrated high-side current sensor circuit, and the average electricity of LED is flowed through using non-essential resistance control Stream, and ADJ pin is subjected to PWM light modulation and simulation light modulation.When the voltage of ADJ pin is less than 0.2V, at power switch tube In off state, MT7201C+ is to be in very low operating current standby mode.The module mainly has chip MT7201C+, electric current Sampling resistor, Schottky diode and loop inductance composition.The voltage that converter exports is added in the pin of chip MT7201C+ On VIN, supply voltage is provided to chip MT7201C+, MT7201C+, which is converted to voltage by the size of current sampling resistor, to be believed Number, constant output electric current is obtained by internal comparator.When light modulation, PWM letter can be provided according to ADJ pin Number, it adjusts driver and exports average current size, purpose is controlled to LED luminance to reach.Preferably, when choosing inductance, When input voltage is relatively large, it is proposed that use the relatively large inductance of inductance value, this can reduce error caused by switching delay.? In relatively wide input voltage range, inductance value is bigger, and LED output curent change is just smaller, so using 47uH inductance.

Preferably, use CS9803 for the circuit of core come complete pyroelectricity module detection function, CS9803 is that it is matched The dedicated integrated circuit of set, uses CMOS technology to manufacture.PIR inductive signal is amplified by internal integrated circuit, if having Trigger signal, amplifier generate high level signal, and timing detection circuit starts timing at this time, count full certain internal clock cycles, It will jump as high level signal, it in this way can be to avoid false triggering.When timing exports, zero passage detection is high level at this time When, positive pulse is just had, the relay or silicon-controlled of rear end is controlled.Single-chip microcontroller is by the period to infrared thermal releasing electric signal in system Be acquired, also do not need to drive silicon-controlled, therefore select RELAY pin as signal output pin, using current-limiting resistance with The control signal of single-chip microcontroller.

The description and the appended drawings of the invention be considered as it is illustrative and not restrictive, on the basis of the present invention, ability According to disclosed technology contents, some of technical characteristics can be made field technique personnel by not needing creative labor Some replacements and deformation, are within the scope of the invention.

Claims (5)

1. a kind of intelligent LED dimming drive system, including intensity of illumination detection module, rpyroelectric infrared module, control core mould Block, EMI filter module, APFC module and PWM dim drive module, which is characterized in that the kernel control module connects respectively Connect intensity of illumination detection module, rpyroelectric infrared module and PWM light modulation drive module, the PWM light modulation drive module connection To LED light string.

2. a kind of intelligent LED dimming drive system according to claim 1, which is characterized in that the APFC module point It is not connected to PWM light modulation drive module and EMI filter module, the EMI filter module connects 220V AC power source.

3. a kind of intelligent LED dimming drive system according to claim 1, which is characterized in that the core controls mould Block is also singly connected with power module.

4. a kind of LED intelligent dimming drive system according to claim 1, which is characterized in that the ambient lighting is strong Spending detection circuit module includes intensity of illumination detection circuit, the intensity of illumination detection circuit include concatenated insurance resistance with Photo resistance, the insurance resistance connect 3V3 power supply, the photo resistance other end ground connection.

5. according to a kind of LED intelligent dimming drive system described in claim 1, which is characterized in that the control core module Including single-chip microcontroller, the single-chip microcontroller includes Flash program memory and 10 analog-digital converters.