WO2015089731A1

WO2015089731A1 - Led driving apparatus and driving method and led lamp

Info

Publication number: WO2015089731A1
Application number: PCT/CN2013/089676
Authority: WO
Inventors: 叶军
Original assignee: 深圳普得技术有限公司
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2015-06-25
Also published as: CN104363980A

Abstract

An LED driving apparatus, an LED lamp and an LED driving method. The LED driving apparatus includes a wireless receiving module (100) and an LED driving module (140) which are communicatively connected via a digital interface (124); the wireless receiving module (100) comprises a main control module (101) and a wake-up module (102) which are connected to each other; the wake-up module (102) sends out a sleep/wake-up control signal so as to enable the main control module (101) to work in a sleep mode and a wake-up mode at a predefined time interval; the main control module (101), in the wake-up mode, views whether a control instruction is received, if so, a digital control signal is generated and sent to the LED driving module (140); and the LED driving module (140) includes a latching unit, and the LED driving module (140) generates a driving current and/or voltage for supply to an LED lamp group (150). The driving apparatus enables the wireless receiving module to be in the sleep mode for a long time, and only switches between the sleep mode and the wake-up mode at the predefined time interval. When the wireless receiving module is in the sleep mode, the high temperature generated by the LED lamp group will not affect the life of the wireless receiving module, thereby improving the life of the LED driving apparatus.

Description

LED driving device, driving method and LED lamp

Technical field

The present invention relates to the field of LED technologies, and in particular, to an LED driving device, a driving method, and an LED lamp.

Background technique

Under the global trend of low carbon, green and environmental protection, with the continuous advancement of LED technology, LED The application field of the product is gradually expanding. At the same time, LED intelligent lighting has gradually been accepted with the popularity of LED. In LED smart lighting products, using WiFi, Zigbee Digital communication methods such as Bluetooth have become a trend to achieve lighting control.

The LED control part of intelligent lighting mainly involves controlling the opening of the LED / Off, and dimming technology. In the prior art, whether the monochromatic light or the multi-color (or mixed color) dimming uses the control chip to output the PWM signal, the LED driving chip adjusts the driving according to the PWM output waveform. The output current and / or voltage of the LED.

In LED lighting applications, drive power is often the bottleneck in the life of LED lighting devices. This is mainly due to LED Lighting devices operate at higher temperatures, close to the working limits of general-purpose electronic devices and chips. In this case, add more complex digital communication modules such as WiFi, Zigbee, and Bluetooth. The reliability and longevity of the overall solution will further decline.

FIG. 1 is a schematic structural view of an LED driving device in the prior art. In the existing LED driving device, the wireless receiving module 100 Receiving an external control command and generating a PWM signal, outputting the PWM signal to the LED driving module 140, and the LED driving module 140 receiving the PWM The signal acts as an input control signal to effect dimming of the LED light set 150. The duty cycle of the PWM signal corresponds to the LED driver module 140 drive LED group 150 The average current or voltage intensity is used for dimming purposes. Therefore, after receiving the control command, the wireless receiving module 100 outputs the PWM signal to the LED driving module through the analog interface 120. 140, PWM signal needs to be maintained in real time.

As shown in FIG. 10, in the prior art, the driving method of the LED driving device, together with FIG. 1, can be seen in the prior art, the wireless receiving module After receiving the control command, the LED driving module 140 is controlled by outputting a PWM signal, and the LED driving module 140 adjusts the LED light group according to the PWM signal. Current or voltage. Since the PWM signal must exist in real time, the wireless receiving module 100 must be in an active state, which will result in a decrease in the life of the LED driver.

Summary of the invention

The technical problem to be solved by the present invention is to provide an improved LED driving device, driving method and LED for the defects of the prior art. Lighting.

The technical solution adopted by the present invention to solve the technical problem thereof is to provide an LED driving device including a wireless receiving module and an LED a driving module, a wireless receiving module and an LED driving module are connected by a digital interface; wherein

The wireless receiving module includes a main control module and a wake-up module;

The wake-up module is connected to the main control module and sleeps to the main control module / Wake up the control signal, so that the main control module works in the sleep mode and the awake mode at predetermined time intervals; the main control module checks whether the control command is received in the awake mode, and if so, generates a corresponding command according to the control command Digital control signals are sent to the LED driver module;

The LED driver module includes a latch unit for latching digital control signals, LED The digital control signal latched by the drive module generates the drive current and / or voltage supply to the LED group.

In the LED driving device of the present invention, the latch unit is an AC/DC chip, and the LED driving module further includes a driving circuit. The AC/DC chip receives and latches the digital control signal from the master module and controls the output current and/or voltage amplitude of the driver circuit based on the digital control signal to control the LED group The state of illumination.

In the LED driving device of the present invention, the latch unit is a PWM generator, and the LED driving module further includes a switching circuit and a driving circuit; wherein the PWM generator receives and latches a digital control signal from the main control module, and generates a PWM control signal according to the latched digital control signal; the switching circuit is based on the PWM The control signal converts the current and/or voltage output by the driver circuit into a drive current and/or voltage output to the LED group.

An LED luminaire that includes an LED driver and an LED illuminator connected to it.

An LED driving method comprising:

The main control module in the wireless receiving module operates in the sleep mode and the awake mode at predetermined time intervals; the main control module Do not do any processing in the sleep mode, check whether the control command is received in the awake mode, and if so, generate the corresponding digital control signal according to the control command and send it to the LED driver module;

The LED driver module receives and latches the digital control signal and generates a drive current and/or voltage supply based on the latched digital control signal. LED light group.

The LED driving method of the present invention, when the main control module is in the awake mode, If it is found that the control command has not been received, no processing is performed and the sleep mode is entered after the predetermined time interval.

The invention has the beneficial effects that the wireless receiving module keeps the wireless receiving module in a sleep state for a long time, but switches between the sleep mode and the awake mode at predetermined time intervals, and outputs the digital control signal to the LED driving module through the digital interface, and then Go to sleep. LED when the wireless receiver module is not working The high temperature generated by the lamp set does not affect the life of the wireless receiving module, thus greatly increasing the life of the LED driver.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic diagram of a module of an LED driving device in the prior art;

2 is a schematic block diagram of an LED driving device of the present invention;

3 is a schematic diagram of internal modules of a wireless receiving module and an LED driving module in the LED driving device of the present invention;

4 is a timing diagram of an awake mode and a sleep mode in the LED driving device of the present invention;

Figure 5 is a schematic view showing the details of the module in the first embodiment of the LED driving device of the present invention;

Figure 6 is a circuit diagram of the first embodiment of the LED driving device of the present invention;

7 is a schematic diagram showing waveforms of an output current or voltage controlled by an AC/DC chip in the first embodiment of the LED driving device of the present invention;

Figure 8 is a schematic view showing the details of the module in the second embodiment of the LED driving device of the present invention;

Figure 9 is a circuit diagram of the second embodiment of the LED driving device of the present invention;

10 is a schematic flow chart of a LED driving method in the prior art;

Figure 11 is a flow chart showing the LED driving method of the present invention.

detailed description

For a better understanding of the technical features, objects and effects of the present invention, the embodiments of the present invention are described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the present invention contemplates an LED driving device for controlling an LED lamp group 150 according to a control command issued by a user. The lighting state includes a wireless receiving module 100 for receiving control commands and an LED driving module 140 for controlling the lighting state of the LED light group 150, both of which pass through the digital interface 124. Connected.

The wireless receiving module 100 is configured to generate a digital control signal according to the received control command and pass through the digital interface 124. A digital control signal is sent to the LED driver module 140.

As shown in FIG. 3, the wireless receiving module 100 includes a main control module 101 and a wake-up module 102. Wakeup module 102 It is connected to the main control module 101 and issues a sleep/wake control signal to the main control module 101, so that the main control module 101 operates in the sleep mode and the awake mode at predetermined time intervals. In wake mode, The main control module 101 checks whether a control command is received, and if so, generates a corresponding digital control signal according to the control command, and sends it to the LED driving module 140; if not, the main control module 101 Enter sleep mode.

The LED driving module 140 includes a latch unit for latching the digital control signal. LED driver module 140 according to The latched digital control signal produces a drive current and/or voltage supply to LED group 150 to control the illumination state of LED group 150.

As shown in Figure 4, the time mode of the awake mode and the sleep mode, the main control module 101 Working in the sleep mode and the awake mode at predetermined time intervals, it can be seen that the time T1 in which the main control module 101 is in the awake mode is much shorter than the time T2 in the sleep mode.

Two embodiments of the LED driving device of the present invention will be separately described below with reference to Figs. 5 to 9.

As shown in FIG. 5, in the first embodiment of the present invention, the latch unit is an AC/DC chip 241. LED Driver Module 140 Also included is a driver circuit 141 that receives and latches a digital control signal from the master module 101 and controls the output current of the driver circuit 141 based on the digital control signal and / Or the magnitude of the voltage, thereby controlling the illumination state of the LED group 150.

FIG. 6 is a diagram showing the connection relationship between the AC/DC chip 241 and the driving circuit 141 in the present embodiment.

The driving circuit 141 includes an electromagnetic interference filter, a rectifying circuit, a resistor R2, a resistor R3, a resistor R5, and a resistor R6. , resistor R7, resistor R8, resistor R10, resistor R11, resistor R15, capacitor C2, capacitor C3, capacitor C5, capacitor C6, diode D5, Diode D6, diode D7, magnetic induction coil 271, magnetic induction coil 272, magnetic induction coil 273 and MOS transistor M1.

The input of the EMI filter is connected to an AC voltage. Understandably, the AC input voltage is 85V-265V.

The rectifier circuit is a bridge rectifier circuit composed of a diode D1, a diode D2, a diode D3, and a diode D4. The first end of the resistor R10 is connected to the output end of the rectifier circuit, the second end is connected to the first end of the resistor R11, and the second end of the resistor R11 is grounded.

The first end of the resistor R5 is connected to the output end of the rectifier circuit, and the second end is connected to the first end of the resistor R6. Resistance R6 The second end is connected to the negative terminal of diode D5. The anode of the diode D5 is connected to the second end of the magnetic coil 271. Capacitor C3 is connected in parallel across resistor R5.

The first end of the magnetic induction coil 271 is connected to the output of the rectifier circuit. Magnetic induction coil 272 and magnetic induction coil 271 Reverse coupling. The anode of diode D7 is coupled to the first end of magnetic coil 272. Capacitor C5 and resistor R8 are connected in parallel between the negative terminal of diode D7 and the second end of magnetic induction coil 272, and the capacitor C5 and resistor R8 are connected in parallel with LED lamp group 150 at both ends. Capacitor C6 is connected between the second end of magnetic induction coil 272 and ground.

The magnetic induction coil 273 is reversely coupled to the magnetic induction coil 27 1 , and the second end of the magnetic induction coil 273 is grounded. Diode D6 The positive pole is connected to the magnetic induction coil 273 at the first end, and the negative pole is connected to the first end of the capacitor C2. Capacitor C2 is grounded at the second end. The resistor R2 and the resistor R3 are connected in series between the second end of the magnetic induction coil 273 and the ground. resistance The first end of R15 is connected between resistor R2 and resistor R3, and the second terminal is connected to AC/DC chip 241. MOS transistor M1 gate connection AC/DC chip 241 The source is connected to the second end of the magnetic induction coil 271, and the drain is grounded through the resistor R7.

The first interface of the AC/DC chip 241 FB is connected to the second end of the resistor R15; the second interface VR is connected to the resistor Between R10 and resistor R11; third interface IN connects to wireless receiver module 100 via digital interface 124; eighth interface LVSS is grounded; ninth interface VCS connects MOS transistor The drain of M1; the twelfth interface GATE is connected to the gate of MOS transistor M1; the thirteenth interface VCC is connected to the cathode of diode D6.

Figure 7 is an AC/DC chip 241 receiving the wireless receiving module 100 After the digital control signal, the waveform of the control output current or voltage is controlled by controlling the reference line. The AC/DC chip 241 generates a

variable reference line

710 and 720 based on the received digital control signal. . When the magnetic induction coil 271 is charged, the current gradually increases, and the voltage 730 of the ninth interface VCS of the AC/DC chip 241 also increases. When AC/DC chip 241 The ninth interface of the VCS voltage 730 reaches the

reference line

710 or 720, the AC/DC chip 241 stops charging the magnetic induction coil 271 and switches to the pair of LEDs 150 output mode. When the reference line 710 is high, the output current of the LED group 150 is large; when the reference line 720 is low, the output current of the LED group 150 is small.

As shown in Figs. 8 and 9, in the second embodiment of the present invention, the latch unit is a PWM generator 145. LED driver module The 140 also includes a switch circuit 146 and a drive circuit 141.

Wherein, the PWM generator 145 receives and latches from the main control module 101. The digital control signal generates a PWM control signal based on the latched digital control signal. The switching circuit 146 converts the current output from the driving circuit 141 according to the PWM control signal Or the voltage is converted to drive current and / or voltage output to the LED light set 150.

It can be understood that the internal circuit configuration of the driving circuit 141 in this embodiment is exactly the same as that in the first embodiment, and details are not described herein again.

The switch circuit 146 is connected to the drive circuit 141, the LED lamp set 150, and the PWM generator 145, respectively. The switching circuit 146 converts the current and/or voltage output from the driving circuit 141 into driving current and/or voltage according to the PWM control signal and outputs it to the LED lamp group 150. It can be understood that the LED lamp group 150 in this embodiment is a group of lamps in parallel with each other, and several LED lamps are connected in series on each lamp group; the switch circuit 146 Set several switches on the array light group separately.

Understandably, the wireless receiving module 100 and the PWM generator 145 It can be on the same chip or it can be separate.

The present invention also provides an LED luminaire comprising an LED driving device and an LED lamp group 150 connected thereto . It can be understood that the LED driving device can be the LED driving device in the first embodiment or the second embodiment.

It can be understood that the LED light group 150 is composed of a single color LED light or at least two color LED lights.

As shown in FIG. 11 , the present invention further provides an LED driving method, which is combined with FIG. 5 or FIG. 8 , and the wireless receiving module 100 . Perform the following steps:

In the wireless receiving module 100: the wake-up module 102 sends a sleep/wake control signal to the main control module 101, so that The main control module 101 operates in a sleep mode and an awake mode at predetermined time intervals. In the sleep mode, the master module 101 does nothing. In the awake mode, the main control module 101 Check if the control command is received:

If yes, generate a corresponding digital control signal according to the control command, and send the digital control signal to the LED driver module. 140. It can be understood that, in the first embodiment, the digital control signal is sent to the AC/DC chip 241 of the LED driving module 140. In the second embodiment, the digital control signal is sent to the LED. The PWM generator 145 of the driving module 140 ;

If not, no processing is done and the sleep mode is entered after a predetermined time interval.

In the LED driving module 140: the LED driving module 140 receives and latches the digital control signal, and then according to The latched digital control signal produces a drive current and/or voltage supply to the LED bank 150.

In the first embodiment, the AC/DC chip 241 receives and latches the digital control signal sent by the wireless receiving module 100. The driving current and/or voltage is generated based on the latched digital control signal to control the current and/or voltage outputted by the driving circuit 14 1 to control the lighting state of the LED lamp group 150.

In the second embodiment, the PWM generator 145 receives and latches the wireless receiving module 100. The digital control signal is sent to generate a PWM control signal according to the latched digital control signal; the switch circuit 146 outputs the current output from the driving circuit 141 according to the PWM control signal. Or the voltage is converted to a drive current and/or voltage and output to the LED light set 150, which drives the current and/or voltage to control the illumination state of the LED light set 150.

The above description is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, and all the technical solutions under the inventive concept belong to the protection scope of the present invention. It should be noted that those skilled in the art should be considered as the scope of protection of the present invention without departing from the principles of the present invention. .

Claims

An LED driving device comprising a wireless receiving module (100) and an LED driving module (140), wherein the wireless receiving module ( 100) and the LED driving module (140) is communicatively connected through a digital interface (124); wherein

The wireless receiving module (100) includes a main control module (101) and a wake-up module (102);

The wake-up module (102) is connected to the main control module (101) and sends sleep to the main control module (101)/ Wake up the control signal, causing the main control module (101) to operate in a sleep mode and an awake mode at predetermined time intervals; the main control module (101) checks whether a control command is received when the awake mode is performed, and if so Generating a corresponding digital control signal according to the control command and transmitting to the LED driving module (140);

The LED driving module (140) includes a latch unit for latching the digital control signal, and the LED driving module (140) And generating a driving current and/or a voltage supply LED lamp group (150) according to the latched digital control signal.
The LED driving device according to claim 1, wherein said latch unit is an AC/DC chip (241), said LED The driving module (140) further includes a driving circuit (141), the AC/DC chip (241) receiving and latching from the main control module (101) The digital control signal controls the amplitude of the output current and/or voltage of the driving circuit (141) according to the digital control signal, thereby controlling the LED light group (150) The state of illumination.
The LED driving device according to claim 1, wherein said latch unit is a PWM generator (145), said LED The driving module (140) further includes a switching circuit (146) and a driving circuit (141); wherein the PWM generator (145) receives and latches The digital control signal from the main control module (101) generates a PWM control signal according to the latched digital control signal; the switching circuit (146) is based on the PWM A control signal converts the current and/or voltage output by the drive circuit (141) into a drive current and/or voltage output to the LED light set (150).
An LED lamp characterized by comprising the LED driving device according to any one of claims 1 to 3, and an LED connected thereto Light set (150).
An LED driving method, comprising:

The main control module (101) in the wireless receiving module (100) operates in a sleep mode and an awake mode at predetermined time intervals; the main control module (101) Not performing any processing in the sleep mode, checking whether a control command is received in the awake mode, and if so, generating a corresponding digital control signal according to the control command and transmitting to the LED driving module ( 140 ) ;

The LED driving module (140) receives and latches the digital control signal, and generates a driving current and/or according to the latched digital control signal. Or voltage supply LED light group ( 150 ).
The LED driving method according to claim 5, wherein, when the main control module (101) is in the awake mode, If it is found that the control command has not been received, no processing is performed and the sleep mode is entered after the predetermined time interval.