CN206650891U - A kind of RGB LEDs of WIFI controls - Google Patents

Abstract

The utility model discloses a kind of RGB LEDs of WIFI controls, including constant pressure source, it is attempted by three independent constant-current sources of constant pressure source output terminal, the R LED strips being connected respectively with three constant-current sources, G LED strips, B LED strips, power module, control module and WIFI module.Using the technical solution of the utility model, integrating WIFI module and control module in LED drive circuit, so as to easily be communicated with external smart equipment, user just can easily realize light modulation toning by smart machine.

Description

A kind of RGB-LED lamps of WIFI controls

Technical field

It the utility model is related to intelligent lighting field, more particularly to a kind of RGB-LED lamps of WIFI controls.

Background technology

At present, illumination based on RGB-LED primitive colours LEDs because the implementation of its light modulation toning can provide abundant light source and Gradually it is valued by people.LED light source based on three primary colors RGB is mainly used in LED display board, display backlight source, builds The decoration of thing and landscape, indoor and outdoor and street light illumination are built, improves sleep in bedroom, agriculture field improves the growth hair of animals and plants Educate.

LED driving gradually develops from the direction of simulation-to-digital, is primarily due to digital integrated electronic circuit microcontroller Decline with the cost of the chip such as digital signal processor DSP, use digitized microcontroller and traditional analog-driven chip To do the drive control of Switching Power Supply, its cost variance is gradually reduced, and digitized solution have it is bigger flexible Property, it is to realize drive control by software algorithm based on the platform of microcontroller, therefore can be according to the demand of client, very The upgrading of software or the change according to input/output condition, change software algorithm etc. are readily realized to meet the needs of client. In new product development, the R＆D cycle of new product can be accelerated using digitized solution, increase the competition of new product Power.The interface enriched using microcontroller chip itself, the various communications with outside can be very easily realized, to realize intelligence The control of change and intelligentized light modulation toning.If increasing wireless module such as Wi-Fi or bluetooth etc., in that context it may be convenient to realize Intelligent wireless controls.In particular with the progress of network technology and technology of Internet of things, the numeral for RGB-LED driving powers is driven Dynamic technology, its advantage more highlight.

Therefore for drawbacks described above present in currently available technology, it is necessary to be studied in fact, to provide a kind of scheme, Solves defect present in prior art.

Utility model content

In order to overcome the shortcomings of the prior art, it is necessory to provide a kind of RGB-LED lamps of WIFI controls, there is provided one Kind of low cost, small size, the tunable optical of high reliability are mixed colours LED drive circuit, can by WIFI module easily with outside intelligence Energy equipment connects and realizes intelligent control.

In order to solve technical problem existing for prior art, the technical solution of the utility model is as follows：

A kind of RGB-LED lamps of WIFI controls, including constant pressure source, three independent perseverances for being attempted by the constant pressure source output terminal Stream source, R-LED strings, G-LED strings, B-LED strings, power module, control module and the WIFI moulds being connected respectively with three constant-current sources Block, wherein,

The constant pressure source is connected with electric main input, and power supply electricity is provided to three road constant-current sources for exporting constant voltage Pressure；

Three road constant-current sources are controlled by the control module and the output end with the constant pressure source is connected, and output is permanent respectively Stream driving R-LED strings, G-LED strings and B-LED strings, the R-LED go here and there for sending feux rouges；The G-LED goes here and there green for sending Light；The B-LED goes here and there for sending blue light；

The control module is connected with the WIFI module, and three tunnel constant currents are controlled respectively for exporting three road pwm signals Source makes the constant-current source adjustment output constant current value；

The WIFI module is connected by wireless WIFI with external smart equipment, for receiving external control instruction, root The pwm signal that three road different proportions are exported according to control module described in external control instruction dims toning so as to realize；

The power module is connected with electric main input, for being provided for the control module and the WIFI module Supply voltage.

Preferably, the constant pressure source further comprises rectification filtering module, power factor correction module, NCL30051 controls Module, resonance oscillation semi-bridge module and constant pressure and flow feedback module, wherein,

The rectification filtering module is connected with electric main input, for being exported after electric main is carried out into rectifying and wave-filtering To the power factor correction module；

The power factor correction module is connected with the NCL30051 control modules and resonance half-bridge module, be used for into Row PFC simultaneously exports high direct voltage signal to the resonance oscillation semi-bridge module；

The resonance oscillation semi-bridge module and the NCL30051 control modules and constant pressure and flow feedback module, for passing through LLC Resonance exports constant voltage and provides supply voltage to three road constant-current sources；

The constant pressure and flow feedback module is used for change and the electricity for monitoring the voltage of the resonance oscillation semi-bridge module output signal The change of stream simultaneously feeds back to the NCL30051 control modules；

The NCL30051 control modules are used for feedback signal and the power according to the constant pressure and flow feedback module The work of the output signal regulation power factor correction module and the resonance oscillation semi-bridge module of factor correcting module makes described The output signal of resonance oscillation semi-bridge module maintains constant voltage.

Preferably, the WIFI module uses someone's science and technology USR-WIFI232-G2Wi-Fi modules.

Preferably, the control module uses Microchip single-chip microcomputers PIC12F1572.

Preferably, the constant-current source uses integrated LED control chip NCL30160.

Preferably, serial port is used between the WIFI module and the control module.

Compared with prior art, due to the technical solution of the utility model in LED drive circuit integrating WIFI module And control module, so as to easily be communicated with external smart equipment, user just can easily realize light modulation by smart machine Toning.

Brief description of the drawings

Fig. 1 is the theory diagram of the RGB-LED lamps of the utility model WIFI controls.

Fig. 2 is the theory diagram of constant pressure source in the utility model.

Fig. 3 is the circuit theory diagrams of NCL30051 control modules in the utility model.

Fig. 4 is the circuit theory diagrams of power factor correction module in the utility model.

Fig. 5 is the circuit theory diagrams of resonance oscillation semi-bridge module in the utility model.

Fig. 6 is the principle schematic of constant pressure and flow feedback module in the utility model.

Fig. 7 is the circuit theory diagrams of constant-current source in the utility model.

Specific examples below will further illustrate the utility model with reference to above-mentioned accompanying drawing.

Embodiment

Technical scheme provided by the utility model is described further below with reference to accompanying drawing.

Referring to Fig. 1, the theory diagram of the RGB-LED lamps of the utility model WIFI controls is shown, including constant pressure source and connect Three independent constant-current sources in constant pressure source output terminal, the R-LED strings being connected respectively with three constant-current sources, G-LED strings, B-LED strings, Power module, control module and WIFI module, wherein,

Constant pressure source is connected with electric main input, and supply voltage is provided to three road constant-current sources for exporting constant voltage；

Three road constant-current sources are controlled by control module and are connected with the output end of constant pressure source, respectively output constant current driving R- LED strip, G-LED strings and B-LED strings, R-LED go here and there for sending feux rouges；G-LED goes here and there for sending green glow；B-LED goes here and there for sending out Go out blue light；

Control module is connected with WIFI module, controls three road constant-current sources to make constant current respectively for exporting three road pwm signals Source adjusts output constant current value；

WIFI module is connected by wireless WIFI with external smart equipment, for receiving external control instruction, according to outer The pwm signal that portion's control instruction control module exports three road different proportions dims toning so as to realize；

Power module is connected with electric main input, for providing supply voltage for control module and WIFI module.By In using independent power module to provide supply voltage for control module and WIFI module, so as to improve the stability of system, Even if constant pressure source, constant-current source break down, the work that control module and WIFI module also can independently be stablized.

In above-mentioned technical proposal, external smart equipment is that the intelligence such as smart mobile phone, IPAD, intelligent household control terminal is set It is standby, it is connected by way of wireless WIFI with the WIFI module in LED, user sends control instruction just by smart machine Light modulation toning can easily be realized.The pwm signal that control module produces three tunnel independences controls three road constant-current sources respectively, and then drives respectively Dynamic three strings RGB LED strips, because every paths of LEDs string can realize single PWM brightness adjustment controls, control module will be according to control information PWM parameters are updated, change PWM duty cycle, so as to realize brightness of the regulation per paths of LEDs string, due to being unable to colour temperature using the tunnels of RGB tri- LED strip, the regulation of different LED strip brightness can realize the regulation of colour temperature again.

In a preferred embodiment, WIFI module uses someone's science and technology USR-WIFI232-G2Wi-Fi modules.Someone Scientific and technological USR-WIFI232-G2Wi-Fi modules are a integrated 802.11b/g/n Wi-Fi low-power-consumption embedded Wi-Fi Module.This Wi-Fi module is used to realize transmitting-receiving of the serial ports to Wi-Fi packet, and user need not be concerned about in detail when in use Process, inside modules are automatically performed the conversion of various agreements, are user-friendly, can also by serial ports using AT instruct into OK, used during convenient exploitation debugging.Selected WI-Fi modules have following functions, meet the needs of intelligent LED control.Its Feature has：

(1) 802.11b/g/n wireless standards are supported.

(2) UART/PWM/GPIO data communication interfaces are supported.

(3) STA/AP/STA+AP coexistence work modes are supported.

(4) Smart Link intelligent networking functions are supported；

(5) sound wave intelligent networking configuration is supported.

(6) WPS networked deployments are supported.

(7) 5 road TCP Client connections are supported.

(8) 3.3V single supplies are powered.

In a kind of preferred embodiments, referring to Fig. 2, the structured flowchart of constant pressure source in the utility model, constant pressure are shown Source further comprises rectification filtering module, power factor correction module, NCL30051 control modules, resonance oscillation semi-bridge module and constant pressure Constant current feedback module, wherein,

Rectification filtering module is connected with electric main input, for being exported after electric main is carried out into rectifying and wave-filtering to work( Rate factor correcting module；

Power factor correction module is connected with NCL30051 control modules and resonance half-bridge module, for carry out power because Number corrects and exports high direct voltage signal to resonance oscillation semi-bridge module；

Resonance oscillation semi-bridge module and NCL30051 control modules and constant pressure and flow feedback module, for being exported by LLC resonance Constant voltage provides supply voltage to three road constant-current sources；

Constant pressure and flow feedback module is used for the change of voltage and the change of electric current for monitoring resonance oscillation semi-bridge module output signal And feed back to NCL30051 control modules；

NCL30051 control modules are used for feedback signal and power factor correction module according to constant pressure and flow feedback module Output signal regulation power factor correction module and resonance half-bridge module work tie up the output signal of resonance oscillation semi-bridge module Hold constant voltage.

NCL30051 is a power source special integrated circuit (IC), can be decompression DC-DC (DC-DC) converter/ LED driver provides constant voltage.This device is integrated with critical conduction mode (CrM) pfc controller and a half-bridge is humorous Shake controller, and built-in 600 volts of (V) drivers, is optimized for offline power supply application, possesses and all realizes high energy Effect, the characteristic of small form factor design.NCL30051 half bridge section is worked using fixed frequency.This device passes through regulation The output voltage of PFC sections carrys out voltage stabilizing, and is integrated with feedback control loop open-circuit-protection, then adds the over-pressed and under-voltage testing mechanisms of PFC, and Adjustable frequency oscillator that can be using highest setting as 75 KHzs (kHz).It is above-mentioned just because of NCL30051 integrated chips Functional unit, power circuit design can be simplified with minimum required outer member, be limited space and be particular about the electricity of high energy efficiency Source application provides splendid solution.

Power factor correction module and resonance half-bridge module share a feedback control in the utility model, this with it is traditional The feedback control in two stages is independently of each other entirely different in topological structure, simultaneously as using NCL30051, resonance half Bridge module is operated in fixed frequency, it means that the adjustment of output voltage depends on power factor correction module output voltage Adjustment, the output of power factor correction module and the output of resonance oscillation semi-bridge module keep fixed constant rate, this improvement Simplify the complexity of control.The problem of resonance oscillation semi-bridge module is operated under fixed frequency, and this alleviates powered electromagnetic interference again, Simplify the design of electromagnetic interface filter.

In a preferred embodiment, control module uses Microchip single-chip microcomputer PIC12F1572, PIC12F1572 is a microcontroller with 16 simulation PWM functions, when this microcontroller has independent with three Zhong Yuan 16 PWM controllers of high-resolution, this microcontroller has independent core peripheral hardware complementation waveform generator, enhanced Universal synchronous or asynchronous receiver (EUSART) and analog-digital converter (ADC).The closed loop feedback control that can be used under more application scenarios System and communication.The utility model is realized serial communication and is realized that LED light modulation is mixed colours using three road PWM using EUSART.

Referring to Fig. 3, the circuit theory diagrams of NCL30051 control modules in the utility model, NCL30051 control moulds are shown Block includes NCL30051 chips, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the One diode D1, wherein, the VREF pins of NCL30051 chips are connected with the first electric capacity C1 one end, NCL30051 chips PCT pins are connected with the second electric capacity C2 one end, and the OSC pins of NCL30051 chips are connected with the 3rd electric capacity C3 one end Connect, the HVS pins of NCL30051 chips are connected with the 4th electric capacity C4 one end, the 4th electric capacity the C4 other end and NCL30051 The HBoost pins of chip and the first diode D1 negative terminal are connected, the first diode D1 anode and NCL30051 chips VCC pin and the 5th electric capacity C5 one end are connected, and the 5th electric capacity C5 other end and the auxiliary of power factor correction module supply Electric end is connected；PCS pins, PDRV pins, PZCD pins, HV pins, PFB pins and the power factor school of NCL30051 chips Positive module is connected, the first electric capacity C1 other end, the second electric capacity C2 other end, the 3rd electric capacity C3 the other end, GND pin, the PGND pins of NCL30051 chips are connected with ground terminal；The PControl pins and constant pressure and constant of NCL30051 chips The output end of stream feedback module is connected；HDRVh pins, HVS pins, HDRVlo pins and the resonance oscillation semi-bridge of NCL30051 chips Module is connected.

One critical conduction mode (CrM) pfc controller and a half-bridge resonance control due to NCL30051 integrated chips Device processed, therefore, its peripheral circuit structure are relatively easy.

Referring to Fig. 4, the circuit theory diagrams of power factor correction module in the utility model, PFC mould are shown Block includes the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, first resistor R1, second resistance R2,3rd resistor R3, the 4th Resistance R4, the 5th resistance R5, the 6th resistance R6, the first transformer T1, the first metal-oxide-semiconductor Q1, the second diode D2, the 3rd diode D3 and the 4th diode D4, wherein, the 6th electric capacity C6 is attempted by the output end of rectification filtering module, the 6th electric capacity C6 one end with First transformer T1 the first pin, first resistor R1 one end, the 3rd diode D3 anode are connected, first resistor R1's The other end is connected with the HV pins of NCL30051 chips；First transformer T1 second pin and the 4th diode D4 are just End, the first metal-oxide-semiconductor Q1 drain electrode are connected, the 4th diode D4 negative terminal and the 3rd diode D3 negative terminal, the 7th electric capacity C7 One end, the 5th resistance R5 one end be connected and be used as PFC output ends to be connected with resonance oscillation semi-bridge module, the 5th resistance R5's The other end is connected with the 6th resistance R6 one end and is connected jointly with the PFB pins of NCL30051 chips；First transformer T1 the 4th pin is connected with the second diode D2 anode, second resistance R2 one end, the second resistance R2 other end with The PZCD pins of NCL30051 chips are connected, and the second diode D2 negative terminal is as auxiliary power supply end；First metal-oxide-semiconductor Q1 grid Pole is connected with the PDRV pins of NCL30051 chips；First metal-oxide-semiconductor Q1 source electrode and 3rd resistor R3 one end, the 4th resistance R4 one end is connected, the 3rd resistor R3 other end be connected with the 8th electric capacity C8 one end jointly with NCL30051 chips PCS pins are connected；The 6th electric capacity C6 other end, the 4th resistance R4 other end, the 6th resistance R6 other end, the 7th electricity The other end, the 8th electric capacity C8 other end and the first transformer T1 the 3rd pin for holding C7 are connected with ground terminal jointly.

In foregoing circuit, because NCL30051 chip internals are integrated with critical conduction mode (CRM) PFC controls Device, power factor correction module realize PFC by framework peripheral circuit.It is as follows in Fig. 3 circuit design main points：

(1) resistance pressure-dividing network of NCL30051 chips PFB pin and R5, R6 composition protects work(to realize that PFC overvoltages alert Energy.When highest PFC voltages are arranged to 430Vdc, it is desirable to when PFC output voltages are higher than 430V close just PFC drive signals Close；

(2) size of PFC output voltages is fed back to by resonance oscillation semi-bridge output voltage signal by constant pressure and flow feedback module Pcontrol pin are realized；

(3) PFC MOSFET (the first metal-oxide-semiconductor Q1) design mainly considers the pressure-resistant size of hourglass source electrode, and drain load electric current is big It is small, heat dissipation problem caused by conduction impedance etc..PFC voltage maximums are arranged to 430Vdc, therefore the pressure-resistant of selected MOSFET is 600V or more can be to meet to require, and rated current is mainly considered during MOSFET is turned on, PFC inductance peak-peak electricity The value of stream, selected MOSFET rated current need to be more than inductive current peak.Because CRM PFC patterns can be real Existing ZVT, therefore MOSFET loss is mainly conduction loss caused by state resistance and drain current.Consider Afterwards, 650V, 9A MOSFET, IPA60R385CP are selected, its conduction impedance is 0.385 Ω when being 25 degree；

(4) advantage of CRM PFC patterns is exactly that PFC diodes (the 4th diode D4) are operated in zero-current switching mould Formula, therefore, there is no strict requirements to diode D4 reverse recovery phenomena, general Ultrafast recovery diode can just meet will Ask.The pressure-resistant and MOSFET of diode resistance to pressure request is consistent, selects 600V or more pressure-resistant diode.In order to improve Efficiency, reduce the conduction loss of diode, it may be considered that select the slightly higher diode of rated current to reduce diode current flow pressure Vf drops.Therefore selection 600V 3A Ultrafast recovery diode MURS360 is all over can meet design requirement.

In order that pfc controller is operated in the frequency range of verification, select inductance relatively reasonable for 650 μ H-700 μ H.Cause This, the first transformer T1 primary electrical inductance value is set as 650 μ H-700 μ H.It is auxiliary between 15Vdc-18Vdc all the way in order to provide Help voltage, the first transformer T1 secondary ancillary coil turn ratio selection 10:1 is more suitable.In order to maintain whole design and select material to use up Consistent principle is measured, selects PQ-2020 FERRITE COREs as PFC inductance and the magnetic core of resonance oscillation semi-bridge isolating transformer.It is based on 0.83A inputs RMS current, selects three bursts of AWG#30 excitation wires to be used for main winding to reduce A.C.power loss.Its line footpath is 0.61mm.The skeletal internal of magnetic core is about 12mm around line width.This shows that every layer of coiling 18 is enclosed, altogether if coiling 4 or 5 layers, Can be with the circle of coiling 75.

Referring to Fig. 5, the theory diagram of resonance oscillation semi-bridge module is shown, resonance oscillation semi-bridge module includes the second metal-oxide-semiconductor Q2, the 3rd Metal-oxide-semiconductor Q3, the 9th electric capacity C9, the tenth electric capacity C10, the 11st electric capacity C11, the 5th diode D5, the 6th diode D6, the seven or two Pole pipe D7, the 8th diode D8, the 7th resistance R7, the first inductance L1, the second inductance L2 and the second transformer T2, wherein, second Metal-oxide-semiconductor Q2 grid is connected with the HDRVhi pins of NCL30051 chips, the second metal-oxide-semiconductor Q2 drain electrode and the tenth electric capacity C10 One end, the 8th diode D8 negative terminal be connected and be connected jointly with the PFC output ends of power factor correction module, the tenth electricity Hold the C10 other end and the 8th diode D8 anode, the first inductance L1 electric capacity C9 of one end the 9th one end, the 7th diode D7 negative terminal is connected, the first inductance L1 other end and the second inductance L2 one end, the second transformer T2 the first pin phase Connection；Second metal-oxide-semiconductor Q2 source class and the 3rd metal-oxide-semiconductor Q3 source class, the second inductance L2 other end, the of the second transformer T2 Two pins are connected and are connected jointly with the HVS pins of NCL30051 chips；3rd metal-oxide-semiconductor Q3 grid and NCL30051 cores The HDRVlo pins of piece are connected, the 3rd metal-oxide-semiconductor Q3 drain electrode and the 9th electric capacity the C9 other end, the 7th diode D7 anode It is connected and is connected jointly with ground terminal；Second transformer T2 the 3rd pin is connected with the 6th diode D6 anode, the Six diode D6 negative terminal is connected with the 5th diode D5 negative terminal, the 11st electric capacity C11 one end and is used as output plus terminal It is connected with constant-current source；Second transformer T2 the 5th pin is connected with the 5th diode D5 anode；Second transformer T2 The 4th pin be connected with the 7th resistance R7 one end, the 7th resistance R7 other end is connected as output ground terminal with constant-current source Connect, the 11st electric capacity C11 other end is connected with output ground terminal.

In foregoing circuit design, in order to develop the LED drive power of high efficiency and high switching frequency, to realize higher work( Rate density and less volume, wanting for Switching Power Supply high frequency efficient high power density is realized using LLC resonant type soft-switch technologies Ask.The function of resonance oscillation semi-bridge module of the present utility model is that PFC output voltages are converted to 38.5Vdc constant DC voltage. The design of its Primary Component and type selecting are as follows：

(1) power of half-bridge resonance transformer (the second transformer T2) is 60W, working frequency 35KHz, and core type is Ferrite PQ-2020, material PC40, primary side sensibility reciprocal minimum 6mH, primary side leakage inductance：90 μ H-100 μ H, framework types PQ- 2020 14 pin PC materials；Primary side group coil is 2,5 pin, 96 circles, and 2 bursts of AWG#28 excitation wires are simultaneously rich 3 layers, every layer of 32 circle；Secondary around Group coil be 7-10,11-14 pin, with centre cap, 19 circles, and two layers of two bursts of AWG#26 lines coilings.Need to take out around the inductance made Vacuum, varnish technique is soaked, and need to carry out more than 3000Vdc safe voltage-withstand test；

(2) selection of resonance oscillation semi-bridge power switch (the second metal-oxide-semiconductor Q2 and the 3rd metal-oxide-semiconductor Q3), mainly considers resonance oscillation semi-bridge The size and half-bridge resonance of input voltage open up the voltage stress and current stress size for mending that power MOSFET is born in structure And the size of MOSFET conduction impedances.The voltage stress that power MOSFET in resonance oscillation semi-bridge is born is equal to input voltage, I.e. 385 arrive 430Vdc, therefore can meet resistance to pressure request from the power MOSFFET of pressure-resistant 600Vdc and the above.And input electricity Stream peak value is much smaller than 1A, selects rated current to meet the requirement of current stress for 3A and the above power MOSFET.It is and right In the selection of conduction impedance, primary concern conduction loss size caused by it.On the premise of pressure-resistant and rated current is met, lead Logical impedance is the smaller the better.According to analysis above, the 600V N-channel power selected in the utility model MOSFETNDD04N60Z, its rated current are 4.1A, and its maximum conduction impedance is 2 Ω.This selection is more reasonably met The requirement of design；

(3) resonance oscillation semi-bridge module output commutation diode (the 5th diode D5 and the 6th diode D6) is operated in band center The half wave rectification mode of tap output, because without outputting inductance, each commutation diode bears twice of output voltage Stress, in the case of considering certain allowance, the Schottky barrier diodes for selecting 150V pressure-resistant can meet the needs of design.Together When, Schottky diode has very low forward conduction voltage drop, it reduce conduction loss, and other the one of Schottky diode Individual advantage is that it does not have reverse recovery phenomena.This both contributes to the lifting of efficiency.And export the big of commutation diode rated current It is small to have to be larger than output current, while consider certain design capacity.5th diode D5 and the six or two pole in the utility model Pipe D6 selects pressure-resistant 150V, and rated current is 10A Schottky barrier diodes MBRF10H150.

Referring to Fig. 6, the principle schematic of constant pressure and flow feedback module is shown, it is anti-that constant pressure and flow feedback module includes constant pressure Control ring and constant current feedback control loop are presented, constant pressure feedback control loop is used for the change for monitoring the voltage of resonance oscillation semi-bridge module output signal Change and fed back to the PControl pins of NCL30051 chips, constant current feedback control loop is defeated for monitoring resonance oscillation semi-bridge module Go out the change of the electric current of signal and fed back to the PControl pins of NCL30051 chips.Feedback signal is anti-by optocoupler It is fed to the PControl pins of NCL30051 chips.

Only some device acts in synchronization for constant pressure and constant current two parts in foregoing circuit, when load current is small When maximum allowable load current Ioutmax, constant pressure feedback control loop device effect, it is ensured that output voltage is constant normally to be exported Within the fluctuation range of voltage adaptable.When output load current reaches the maximum load current Ioutmax of setting, Voltage Feedback Control loop is substituted by constant current feedback control loop, and constant size of current will be kept by now exporting.

Referring to Fig. 7, the circuit theory diagrams of constant-current source in the utility model are shown, constant-current source further comprises the second chip U2, the 8th resistance R8, the 9th resistance R9, the 12nd electric capacity C12, the 13rd electric capacity C13, the 3rd inductance L3 and the first voltage-stabiliser tube Z1, wherein, the second chip U2 uses integrated LED control chip NCL30160；First voltage-stabiliser tube Z1 negative terminal and resonance oscillation semi-bridge mould The output plus terminal of block is connected, the first voltage-stabiliser tube Z1 anode and the 3rd inductance L3 one end and the second chip U2 the 8th pin It is connected, the 3rd inductance L3 other end is connected with LED light source；Second chip U2 the 7th pin and the 13rd electric capacity C13 One end be connected；Second chip U2 the 6th pin is connected with the PWM control terminals of control module；The 5th of second chip U2 Pin is connected with the 9th resistance R9 one end, the 9th resistance R9 other end and the second chip U2 the 4th pin and the 12nd Electric capacity C12 one end is connected, and the 12nd electric capacity C12 other end, the 8th resistance R8 one end, the 3rd of the second chip U2 the draw Pin, the 13rd electric capacity C13 other end are connected with GND ground terminals jointly；The 8th resistance R8 other end and the second chip U2's First pin is connected with second pin.

In the utility model, constant-current source is realized using integrated LED control chip NCL30160.NCL30160 is a use In the switching regulator of integrated LED, constant current is provided so as to only need seldom peripheral components to be just embodied as LED light source, significantly Simplify circuit structure while reduce the volume of LED drive circuit.NCL30160 is internally integrated only 55 milliohms (m Ω) low conducting MOSFET inside impedance, the high switching frequency of 1.4 megahertzs of highest (MHz) make designer to use smaller outer member, Help minimizes circuit board size and cost minimizes.NCL30160 supports that input voltage range is 6.3V to 40V, this Control chip has the input pin for being exclusively used in PWM light modulations, it is possible to achieve the PWM light modulations of wide scope.Chip has resistance programming Adjust the input pin of constant current size.With short-circuit protection, the defencive function such as under-voltage protection and overtemperature protection shutdown.And its periphery Circuit and its simple, it is only necessary to a small amount of several part cans driving LED light source, maximum output current 1A.

Fig. 7 is the complete circuit schematic diagram using NCL30160 chip drives LED light sources.1,2 pin CS is that current sense is anti- Feed pin, flow through the size of current of LED light source between CS pin and ground to set by connecting a resistance R8.NCL30160 is electricity Stream mode control, when internal FET is turned on, electric current passes through inductance and LED light source and FET from input, then arrives ground.Work as FET During shut-off, electric current is continuously through inductance and LED and diode.Output current control circuit is setting by CS comparator thresholds Put and provide 10% ripple current to realize.Peak point current comparator threshold is 220mV, is arranged to higher than average electric current 10%, and the threshold value of valley point current comparator is 180mV, is arranged to lower than average 10%.When FET is turned on, in inductance Electric current is risen by oblique wave.This electric current is detected by the non-essential resistance R8 between CS pin and ground.When the voltage of CS pin reaches During 220mV, peak point current comparator is by switch-off power FET.One traditional hysteresis controller continues to monitor load current, and When load current, which reduces, reaches 180mV until CS voltages, valley comparator is open-minded by FET.But when the fet is off, electric current Information can not obtain, therefore set the suitable FET turn-off times, and go to adjust by correction signal when FET is turned on herein Turn-off time is necessary.Short-circuit protection is also to be realized by CS comparators, the threshold for the CS comparators of short-circuit protection It is worth for 500mV, i.e. the 2.5 of average electric current times.It is more than normal export average electric current 2.5 times when CS pin detect short circuit current When, the CS comparators for short-circuit protection will turn off FET.Play the function of short-circuit protection.

The ROT pin of NCL30160 chips are off time setting resistance and connect pin.Outer meeting resistance be connected to ROT pin and The turn-off time of hysteresis controller is set between VCC pin.And in follow-up switch periods, when FET is turned on, CS pin detect Voltage, and when the fet is off, the amplitude adjuster threshold value according to CS voltage changes.

The DIM/EN pin of NCL30160 chips are PWM brightness adjustment controls or enabled pin.Connection one is logically high low level Pwm signal enables or closed power MOSFET and LED light source electric current to this pin.Make output current normal value and with It is lower to be changed according to dutycycle.So as to realize the regulation to LED luminance.PWM frequency necessarily be greater than more than 100Hz, otherwise LED light Scintillation occurs in source.But PWM frequency be not easy to it is too high, it is too high that EMI can be caused serious.In a kind of preferred embodiment In, 245Hz PWM frequency can be selected.

The LX pin of NCL30160 chips are that the drain electrode with internal power MOSEFET is connected.The 3rd outside inductance L3 with LX pin are connected.3rd inductance L3 value determined in the course of work, the slope that output current is ramped up and declined.And inductance is electric The slope of stream determines that electric current needs the time how long from the valley of ripple to peak value when FET is turned on；And when FET ends When, electric current needs the time how long from the peak value of ripple current to valley.Higher inductance value reduce output current rise and The slope of decline, this causes the error between the ripple of actual output current and desired value to diminish.But the selection of inductance should make Export the saturation current value that peak current value is no more than electric current.Inductance value becomes big, after frequency reduces, and frequency reduces, MOSFET switching loss response can also reduce.So inductance value selection need consider, cost, volume and loss need Ask.

The explanation of above example is only intended to help and understands method and its core concept of the present utility model.It should refer to Go out, for those skilled in the art, can also be to this on the premise of the utility model principle is not departed from Utility model carries out some improvement and modification, and these are improved and modification also falls into the protection domain of the utility model claims It is interior.

The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The most wide scope consistent with features of novelty.

Claims (6)

1. a kind of RGB-LED lamps of WIFI controls, it is characterised in that including constant pressure source, be attempted by the constant pressure source output terminal Three independent constant-current sources, the R-LED strings being connected respectively with three constant-current sources, G-LED strings, B-LED strings, power module, control mould Block and WIFI module, wherein,

The constant pressure source is connected with electric main input, and supply voltage is provided to three road constant-current sources for exporting constant voltage；

Three road constant-current sources are controlled by the control module and the output end with the constant pressure source is connected, and output constant current drives respectively Dynamic R-LED strings, G-LED strings and B-LED strings, the R-LED go here and there for sending feux rouges；The G-LED goes here and there for sending green glow；Institute B-LED is stated to go here and there for sending blue light；

The control module is connected with the WIFI module, controls three road constant-current sources to make respectively for exporting three road pwm signals The constant-current source adjusts output constant current value；

The WIFI module is connected by wireless WIFI with external smart equipment, for receiving external control instruction, according to outer The pwm signal that control module described in portion's control instruction exports three road different proportions dims toning so as to realize；

The power module is connected with electric main input, for providing power supply for the control module and the WIFI module Voltage.

2. the RGB-LED lamps of WIFI controls according to claim 1, it is characterised in that the constant pressure source further comprises Rectification filtering module, power factor correction module, NCL30051 control modules, resonance oscillation semi-bridge module and constant pressure and flow feedback mould Block, wherein,

The rectification filtering module is connected with electric main input, for being exported after electric main is carried out into rectifying and wave-filtering to institute State power factor correction module；

The power factor correction module is connected with the NCL30051 control modules and resonance half-bridge module, for carrying out work( Rate factor correcting simultaneously exports high direct voltage signal to the resonance oscillation semi-bridge module；

The resonance oscillation semi-bridge module and the NCL30051 control modules and constant pressure and flow feedback module, for passing through LLC resonance Export constant voltage and provide supply voltage to three road constant-current sources；

The constant pressure and flow feedback module is used for change and the electric current for monitoring the voltage of the resonance oscillation semi-bridge module output signal Change and feed back to the NCL30051 control modules；

The NCL30051 control modules are used for feedback signal and the power factor according to the constant pressure and flow feedback module The work of output signal the regulation power factor correction module and the resonance oscillation semi-bridge module of correction module makes the resonance The output signal of half-bridge module maintains constant voltage.

3. the RGB-LED lamps of WIFI controls according to claim 1, it is characterised in that the WIFI module uses someone Scientific and technological USR-WIFI232-G2Wi-Fi modules.

4. the RGB-LED lamps of WIFI controls according to claim 1, it is characterised in that the control module uses Microchip single-chip microcomputers PIC12F1572.

5. the RGB-LED lamps of WIFI controls according to claim 1, it is characterised in that the constant-current source uses integrated LED Control chip NCL30160.

6. the RGB-LED lamps of WIFI controls according to claim 1, it is characterised in that the WIFI module and the control Serial port is used between molding block.