CN104363980A - LED driving device, driving method and LED lamp - Google Patents

Abstract

The invention discloses an LED driving device, an LED lamp and an LED driving method. The LED driving device includes a wireless receiving module and an LED driving module, both of which are connected through a digital interface; the wireless receiving module includes a main control module and a wake-up module connected to each other; the wake-up module sends a sleep/wake control signal to make the main control Work in sleep mode and wake-up mode at intervals; the main control module checks whether it receives a control command in wake-up mode, and if so, generates a digital control signal and sends it to the LED driver module; the LED driver module includes a latch unit, and the LED driver module generates a drive Current and/or voltage are supplied to the LED light sets. The invention keeps the wireless receiving module in the sleep mode for a long time, and only switches between the sleep mode and the wake-up mode at predetermined time intervals. When the wireless receiving module is in the sleep mode, the high temperature generated by the LED lamp group will not affect the service life of the wireless receiving module, thus improving the service life of the LED driving device.

Description

LED driving device, driving method and LED lamp

technical field

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

Background technique

Under the development trend of global low-carbon, green and environmental protection, with the continuous progress of LED technology, the application fields of LED products are gradually expanding. At the same time, LED intelligent lighting is gradually accepted by people with the popularization of LED. In LED intelligent lighting products, it has become a trend to use digital communication methods such as WiFi, Zigbee, and Bluetooth to realize lighting control.

The LED control part of intelligent lighting mainly involves controlling the on/off of LEDs and dimming technology. In the prior art, whether it is single-color dimming or multi-color (or mixed-color) dimming, a control chip is used to output a PWM signal, and the LED driver chip adjusts the output current and/or voltage of the driving LED according to the output waveform of the PWM.

In LED lighting applications, the driving power is often the bottleneck of the life of LED lighting devices. This is mainly due to the high operating temperature of LED lighting devices, which is close to the working limit of general electronic original devices and chips. In this case, adding more complex digital communication modules such as WiFi, Zigbee, and Bluetooth will further reduce the reliability and lifespan of the overall solution.

FIG. 1 is a schematic structural diagram of an LED driving device in the prior art. In the existing LED driving device, the wireless receiving module 100 receives an external control command and generates a PWM signal, and outputs the PWM signal to the LED driving module 140. 150 dimming drive. The duty ratio of the PWM signal corresponds to the average current or voltage intensity of the LED driving module 140 driving the LED lamp group 150, so as to achieve the purpose of dimming. Therefore, after receiving the control instruction, the wireless receiving module 100 will output the PWM signal to the LED driving module 140 through the analog interface 120, and the PWM signal needs to be kept in real time.

As shown in FIG. 10, it is the driving method of the LED driving device in the prior art. Combining with FIG. 1, it can be seen that in the prior art, the wireless receiving module 100 controls the LED driving module 140 by outputting a PWM signal after receiving the control command, and the LED The driving module 140 adjusts the current or voltage of the LED lamp group 150 according to the PWM signal. Since the PWM signal must exist in real time, the wireless receiving module 100 must always be in a working state, which will lead to a decrease in the life of the LED driving device.

Contents of the invention

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

The technical solution adopted by the present invention to solve the technical problem is to provide an LED driving device, including a wireless receiving module and an LED driving module, and the wireless receiving module and the LED driving module are connected through a digital interface for communication; 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 sends a sleep/wake-up control signal to the main control module, so that the main control module works in sleep mode and wake-up mode according to a predetermined time interval; Then generate the corresponding digital control signal according to the control command and send it to the LED driver module;

The LED driving module includes a latch unit for latching the digital control signal, and the digital control signal latched by the LED driving module generates driving current and/or voltage to supply the LED lamp 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, and the AC/DC chip receives and latches a digital control signal from the main control module, and controls the driving circuit according to the digital control signal. Output the magnitude of current and/or voltage, so as to control the lighting state of the LED lamp group.

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

An LED lamp includes an LED driving device and an LED lamp group connected thereto.

A method for driving an LED, comprising:

The main control module in the wireless receiving module works in the sleep mode and the wake-up mode according to the predetermined time interval; the main control module does not do any processing in the sleep mode, checks whether the control command is received in the wake-up mode, and if so, generates a corresponding response according to the control command. The digital control signal is sent to the LED driver module;

The LED driving module receives and latches the digital control signal, and generates driving current and/or voltage according to the latched digital control signal to supply the LED lamp group.

In the LED driving method of the present invention, when the main control module is in the wake-up mode, if it is found that no control command is received, no processing is performed, and it enters the sleep mode after a predetermined time interval.

The beneficial effects of implementing the present invention are: the present invention keeps the wireless receiving module in the sleep state for a long time, only switches between the sleep mode and the wake-up mode according to a predetermined time interval, and outputs the digital control signal to the LED drive module through the digital interface, and then Go to sleep. When the wireless receiving module is not working, the high temperature generated by the LED lamp group will not affect the service life of the wireless receiving module, thus greatly improving the service life of the LED driving device.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

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

Fig. 2 is a schematic diagram of a module of an LED driving device of the present invention;

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

4 is a time schematic diagram of wake-up mode and sleep mode in the LED driving device of the present invention;

Fig. 5 is a schematic diagram of module details in Embodiment 1 of the LED driving device of the present invention;

6 is a circuit diagram of Embodiment 1 of the LED driving device of the present invention;

7 is a schematic diagram of the waveform of the AC/DC chip controlling the output current or voltage in Embodiment 1 of the LED driving device of the present invention;

Fig. 8 is a schematic diagram of module details in Embodiment 2 of the LED driving device of the present invention;

9 is a circuit diagram of Embodiment 2 of the LED driving device of the present invention;

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

FIG. 11 is a schematic flowchart of the LED driving method of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 2 , the present invention conceives an LED driving device, which controls the light-emitting state of the LED lamp group 150 according to the control command issued by the user, and includes a wireless receiving module 100 for receiving the control command and a device for controlling the LED lamp group 150 The LED driving module 140 in the light emitting state is connected through the digital interface 124 .

The wireless receiving module 100 is used for generating digital control signals according to the received control instructions, and sending the digital control signals to the LED driving module 140 through the digital interface 124 .

As shown in FIG. 3 , 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 a sleep/wake-up control signal to the main control module 101, so that the main control module 101 works in the sleep mode and the wake-up mode at predetermined time intervals. In the wake-up mode, the main control module 101 checks whether a control instruction is received, if yes, generates a corresponding digital control signal according to the control instruction, and sends it to the LED driver module 140; if not, the main control module 101 enters the sleep mode.

The LED driving module 140 includes a latch unit for latching the digital control signal. The LED driving module 140 generates driving current and/or voltage to supply the LED lamp group 150 according to the latched digital control signal, so as to control the lighting state of the LED lamp group 150 .

As shown in Figure 4, it is a time schematic diagram of the wake-up mode and the sleep mode. The main control module 101 works in the sleep mode and the wake-up mode according to a predetermined time interval. It can be seen from the figure that the time T1 of the main control module 101 in the wake-up mode is much shorter. at time T2 in sleep mode.

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

As shown in FIG. 5 , in Embodiment 1 of the present invention, the latch unit is an AC/DC chip 241 . The LED driving module 140 also includes a driving circuit 141, the AC/DC chip 241 receives and latches the digital control signal from the main control module 101, and controls the output current and/or voltage amplitude of the driving circuit 141 according to the digital control signal, thereby controlling The light emitting state of the LED lamp group 150 .

FIG. 6 is a connection diagram of the AC/DC chip 241 and the driving circuit 141 in this embodiment.

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

The input terminal of the electromagnetic interference filter is connected with AC voltage. Understandably, the AC input voltage is 85V-265V.

The rectification circuit is a bridge rectification circuit composed of diode D1, diode D2, diode D3 and 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. The second end of the resistor R6 is connected to the cathode of the diode D5. The anode of the diode D5 is connected to the second end of the magnetic induction coil 271 . Capacitor C3 is connected in parallel with both ends of resistor R5.

The first end of the magnetic induction coil 271 is connected to the output end of the rectification circuit. The magnetic induction coil 272 is reversely coupled to the magnetic induction coil 271 . The anode of the diode D7 is connected to the first terminal of the magnetic induction coil 272 . Both the capacitor C5 and the resistor R8 are connected in parallel between the cathode of the diode D7 and the second end of the magnetic induction coil 272 , and both ends of the capacitor C5 and the resistor R8 are connected in parallel to the LED lamp group 150 . The capacitor C6 is connected between the second end of the telecoil 272 and the ground.

The magnetic induction coil 273 is reversely coupled to the magnetic induction coil 271 , and the second end of the magnetic induction coil 273 is grounded. The anode of the diode D6 is connected to the first end of the magnetic induction coil 273 , and the cathode is connected to the first end of the capacitor C2 . The second end of the capacitor C2 is grounded. The resistor R2 and the resistor R3 are connected in series between the second end of the magnetic induction coil 273 and the ground. A first end of the resistor R15 is connected between the resistors R2 and R3 , and a second end is connected to the AC/DC chip 241 . The gate of the MOS transistor M1 is connected to the 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 FB of the AC/DC chip 241 is connected to the second end of the resistor R15; the second interface VR is connected between the resistor R10 and the resistor R11; the third interface IN is connected to the wireless receiving module 100 through the digital interface 124; the eighth interface LVSS ground; the ninth interface VCS is connected to the drain of the MOS transistor M1; the twelfth interface GATE is connected to the gate of the MOS transistor M1; the thirteenth interface VCC is connected to the cathode of the diode D6.

FIG. 7 is a schematic waveform diagram of the AC/DC chip 241 controlling the output current or voltage through the control reference line after receiving the digital control signal from the wireless receiving module 100 . The AC/DC chip 241 generates variable reference lines 710 and 720 according to the received digital control signal. When the induction coil 271 is charged, the current increases gradually, and the voltage 730 of the ninth interface VCS of the AC/DC chip 241 also increases accordingly. When the voltage 730 of the ninth interface VCS of the AC/DC chip 241 reaches the reference line 710 or 720 , the AC/DC chip 241 stops charging the induction coil 271 and switches to an output mode for the LED lamp group 150 . When the reference line 710 is high, the output current of the LED lamp group 150 is high; when the reference line 720 is low, the output current of the LED lamp group 150 is small.

As shown in FIG. 8 and FIG. 9 , in the second embodiment of the present invention, the latch unit is a PWM generator 145 . The LED driving module 140 also includes a switch 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 , and generates a PWM control signal according to the latched digital control signal. The switch circuit 146 converts the current and/or voltage output by the driving circuit 141 into a 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 internal circuit structure of the driving circuit 141 in this embodiment is exactly the same as that in Embodiment 1, and will not be repeated here.

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

It can be understood that the wireless receiving module 100 and the PWM generator 145 can be on the same chip, or can be separated.

The present invention also provides an LED lamp, including 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 above.

It can be understood that the LED lamp group 150 is composed of single-color LED lamps or at least two-color LED lamps.

As shown in FIG. 11 , the present invention also provides an LED driving method. In combination with FIG. 5 or FIG. 8 , the wireless receiving module 100 performs the following steps:

In the wireless receiving module 100: the wake-up module 102 sends a sleep/wake-up control signal to the main control module 101, so that the main control module 101 works in the sleep mode and the wake-up mode at predetermined time intervals. In sleep mode, the main control module 101 does not do any processing. When in the wake-up mode, the main control module 101 checks whether a control command is received:

If yes, generate a corresponding digital control signal according to the control instruction, and send the digital control signal to the LED driver module 140. Understandably, in Embodiment 1, the digital control signal is sent to the AC/DC chip of the LED driver module 140 241. In Embodiment 2, send the digital control signal to the PWM generator 145 of the LED driving module 140;

If not, do nothing and enter sleep mode after a predetermined time interval.

In the LED driving module 140 : the LED driving module 140 receives and latches the digital control signal, and generates a driving current and/or voltage for the LED lamp group 150 according to the latched digital control signal.

In Embodiment 1, the AC/DC chip 241 receives and latches the digital control signal sent by the wireless receiving module 100, and generates a driving current and/or voltage according to the latched digital control signal to control the current and/or voltage output by the driving circuit 141. voltage, so as to control the lighting state of the LED lamp group 150 .

In the second embodiment, the PWM generator 145 receives and latches the digital control signal sent by the wireless receiving module 100, and generates a PWM control signal according to the latched digital control signal; the switch circuit 146 converts the current output by the drive circuit 141 and The/or voltage is converted into driving current and/or voltage and output to the LED lamp group 150 , and the driving current and/or voltage controls the lighting state of the LED lamp group 150 .

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the scope of protection of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (6)

1. An LED driving device comprises a wireless receiving module (100) and an LED driving module (140), wherein the wireless receiving module (100) and the LED driving module (140) are in communication connection through a digital interface (124); wherein,

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

the wake-up module (102) is connected with the main control module (101) and sends a sleep/wake-up control signal to the main control module (101), so that the main control module (101) works in a sleep mode and a wake-up mode according to a preset time interval; the main control module (101) checks whether a control instruction is received or not in the wake-up mode, and if yes, generates a corresponding digital control signal according to the control instruction and sends the digital control signal to the LED driving module (140);

the LED driving module (140) comprises a latch unit for latching the digital control signal, and the LED driving module (140) generates driving current and/or voltage according to the latched digital control signal and supplies the driving current and/or voltage to the LED lamp group (150).

2. The LED driving apparatus according to claim 1, wherein the latch unit is an AC/DC chip (241), the LED driving module (140) further comprises a driving circuit (141), and the AC/DC chip (241) receives and latches the digital control signal from the main control module (101), and controls the amplitude of the output current and/or voltage of the driving circuit (141) according to the digital control signal, so as to control the light emitting state of the LED lamp set (150).

3. The LED driving apparatus according to claim 1, wherein the latch unit is a PWM generator (145), the LED driving module (140) further comprises 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), and generates a PWM control signal according to the latched digital control signal; the switch circuit (146) converts the current and/or voltage output by the driving circuit (141) into a driving current and/or voltage according to the PWM control signal and outputs the driving current and/or voltage to the LED lamp group (150).

4. An LED lamp, characterized by comprising the LED driving device according to any one of claims 1 to 3, and an LED lamp set (150) connected thereto.

5. An LED driving method, comprising:

a main control module (101) in the wireless receiving module (100) works in a sleep mode and an awakening mode according to a preset time interval; the main control module (101) does not perform any processing in the sleep mode, checks whether a control instruction is received or not in the wake-up mode, and generates a corresponding digital control signal according to the control instruction and sends the digital control signal to the LED driving module (140) if the control instruction is received;

the LED driving module (140) receives and latches the digital control signal, and generates a driving current and/or a driving voltage according to the latched digital control signal to supply to the LED lamp set (150).

6. The LED driving method according to claim 5, wherein the main control module (101) does not perform any processing if it is found that the control command is not received by checking while in the wake-up mode, and enters the sleep mode after a predetermined time interval.