RU134383U1 - LED BRIGHTNESS CONTROL DEVICE - Google Patents

Abstract

A device for controlling the brightness of LED lighting, containing a power source connected to the input to the network, made in the form of an AC-to-DC converter, the output of which is connected to the power input of the adjustment unit, characterized in that the device is equipped with an equal number of switching and display devices, while the adjustment unit has inputs of independent channels, at least according to the number of switching devices and outputs of independent channels, at least according to the number of display devices, each of the switching devices being connected by the input to the DC voltage supply output of the control unit, one of the outputs to the input of the corresponding independent channel the adjustment unit, and the other output - to the ground, while each of the display devices is connected by the input to the output of the corresponding independent channel of the adjustment unit, and by the output to the ground, in addition, the adjustment unit at the control output has a terminal for connecting to the driver of the LED device one illumination and is configured to generate a signal at the control output with a given duty cycle when a signal arrives at the input of the corresponding independent channel, and when re-connected to the network and there are no signals at the inputs of independent channels - with the possibility of generating a signal at the control output with a duty cycle of the last signal before turning off ...

Description

The utility model relates to the field of microelectronics and can be used to control the brightness of street, industrial, domestic and architectural and design LED lighting.

A device for controlling light (RU 2390976 C1, IPC: H05B 39/04, published 05/27/2010) - [1], which relates to electrical engineering, in particular to equipment for electric lighting, can be used in lighting installations with regulation luminous flux and contains: the first terminal for connecting in series with the incandescent lamp to the first terminal of the network, the second terminal for connecting to the second terminal of the network, a triac, the cathode of which is connected to one of the terminals of the device and to the first capacitor, and the anode is connected to the terminal a resistor, a voltage divider, the second and third capacitors, according to the invention, a microcontroller, a diode, a zener diode, a fourth capacitor and four resistors are additionally introduced into it, the first terminal of the microcontroller connected to the first terminal of the device, the second terminal of which is used to connect to the second terminal network through the switch, the control electrode of the triac is connected through the second and third resistors respectively to the second and third terminals of the microcontroller, the fourth terminal of which is connected to its the terminal and connected through a series-connected diode, fourth resistor and second capacitor to the second terminal of the device, the voltage divider is connected to the first and second terminals of the device, the midpoint of the voltage divider through the fifth resistor is connected to the sixth terminal of the microcontroller, the seventh terminal of which is connected to the first resistor and through the third capacitor with the diode and the first capacitor, in parallel with which the fourth capacitor is connected, and parallel to the chain of the diode and the first capacitor is connected zener diode.

The disadvantage of the analog device [1] is: insufficient range of brightness control of the LEDs and the inability to control each LED lighting device individually.

Compared with halogen, fluorescent and mercury lamps that are widely used at present as light sources that consume a lot of energy, LEDs have the advantage of consuming significantly less energy, having a long service life and a lack of inertia at startup. LEDs are capable of emitting high-intensity light, however, this significantly increases heat generation, which leads to a decrease in the life of the LEDs, which necessitates the provision of effective constant heat dissipation in LED lighting devices. When using LED brightness control devices, the reliability, energy efficiency and usability of LED lighting devices are increased.

The closest in technical essence and selected as a prototype is a device for controlling the brightness of LED lighting (RU 104409 U1, IPC H05B 37/02, published May 10, 2011) - [2], containing an AC voltage supply circuit, an AC / DC converter and a group of LEDs, in addition, an adjustment block is introduced into it, containing a throttle, a control device, a low-pass filter, a band-pass filter, the first and second high-frequency and low-frequency amplifiers, respectively, an amplitude detector and an LED driver with the following connections: the AC voltage power supply circuit is connected to the input of the AC / DC converter, the output of which is connected through the inductor and low-pass filter to the driver power supply circuit; the output of the control device through an isolation capacitor is connected to the inputs of the low-pass and bandpass filters, the output of the latter is through the high-frequency amplifier, then the amplitude detector and the low-frequency amplifier are connected to the control input of the driver, to the outputs of which LEDs are connected.

The device [2] has several disadvantages: the complexity of the circuitry, high cost, lack of reliability and high power consumption due to multicomponent; the scope is limited to the specific type of driver included with the device.

The basis of the proposed technical solution is the task of creating a universal device to provide changes in the brightness (dimming) of the LED lighting device.

The technical effect of the implementation of the task is:

- reducing the dimensions of the device by increasing the degree of integration;

- improving reliability and reducing the cost of the device as a whole by reducing the number of elements;

- energy saving;

- extension of the life of the LEDs;

- reduction of load on the electric network;

- increase the organoleptic characteristics of the product.

The solution of this problem and the corresponding technical result are achieved by the fact that in the proposed device for controlling the brightness of LED lighting, containing a power source connected to the network input, made in the form of an AC to DC converter, the output of which is connected to the power input of the adjustment unit, the device is equipped with an equal number of devices switching and indication, while the control unit has inputs of independent channels, at least in terms of the number of switching devices and independent outputs channels, at least in terms of the number of display devices, each of the switching devices having an input connected to the DC voltage output of the adjustment unit, one of the outputs to the input of the corresponding independent channel of the adjustment unit, and the other output to the ground, each of which indicating devices with an input connected to the output of the corresponding independent channel of the adjustment unit, and the output to the ground, in addition, the adjustment unit at the control output has a terminal for connecting to the device driver light diode lighting and is configured to generate a signal with a predetermined duty cycle at the control output when a signal arrives at the input of the corresponding independent channel, and when re-connected to the network and there are no signals at the inputs of independent channels, with the possibility of generating the last signal at the control output with a duty cycle before switching off .

Introduction to the proposed device connected to a power source the required number of switching devices and connecting them to the inputs of the corresponding independent channels of the adjustment unit, which is configured to generate a signal with a given duty cycle at the control output when the circuit at the input of the corresponding independent channel is closed, provides due to the possibility of economically selecting beneficial and sparing human vision modes of operation increase the organoleptic characteristics of the device, save electroe ergii, extending the life of the LED lighting device and managed to reduce the load on the electrical network.

In addition, the introduction of indicating devices according to the number of possible modes at the control output of the adjustment unit provides convenience for the consumer due to the visibility of the device.

In addition, the possibility of generating a signal at the control output of the adjustment unit when the switching devices are turned off and reconnecting the proposed device to the network with the duty cycle of the last signal before turning off the device from the network allows, once having selected the optimal brightness mode of LED lighting for human vision, save it during repeated switching on without additional manipulations.

The above distinguishing features of the proposed device in conjunction with the ability to control the brightness of the illumination by a LED device of any type, for which a terminal is provided at the control output of the adjustment unit, expands the scope of the control device and makes it universal with the ability to precisely control the light intensity and display the result of regulation.

A comparative analysis of the proposed device for controlling the brightness of LED lighting with known devices of similar purpose and the lack of descriptions of such in known sources of information allows us to conclude that the proposed utility model meets the criterion of "novelty."

The figure shows a block electric circuit of the proposed device for controlling the brightness of LED lighting with a variant of its expanded electrical circuit.

The device shown in the figure contains:

1 - power supply, made in the form of an AC to DC converter 220v AC - 5v DC, which is connected to the network;

2 - adjustment unit, which is based on a microcontroller;

3 _{1 ÷ n} - switching devices;

4 _{1 ÷ n} - display devices;

The control unit 2 has inputs of independent channels Bx. _{1 ÷ n} , at least in the number of switching devices 3 _{1 ÷ n} and outputs of independent channels _{1 ÷ n} , at least according to the number of display devices 4 _{1 ÷ n} . Each of the switching devices 3 _{1 ÷ n} input connected to the output power output. _Pete. DC voltage of the control unit 2, one of the outputs to the input Vx. _{1 ÷ n of the} corresponding independent channel of the control unit 2, and the other output to the ground, with each of the indicating devices 4 _{1 ÷ n} input connected to the output of the Output. _{1 ÷ n of the} corresponding independent channel of the control unit 2, and the output to the ground, in addition, the control output of the Output. _control control unit 2 has a terminal K for connecting the LED lighting device to the driver (D1; D2;; Dn).

The adjustment unit 2 is configured to form outputs at the control output. _control , a signal with a given duty cycle upon receipt of a signal at the input Bx. _{1 ÷ n of the} corresponding independent channel, and when re-connected to the network and there are no signals at the inputs. _{1 ÷ n} independent channels - with the possibility of forming outputs at the control output. _control signal with the duty cycle of the last signal before turning off.

The adjustment unit in the implementation example shown in the figure uses: U1 - a microcontroller (for example, PIC16F628A); R1 - resistor to reset the RAM of the microcontroller U1 during initial power-up; C1 and C2 are capacitors for smoothing interference on the power of the microcontroller U1.

Each of the switching devices contains: a clock button (SB ₁ ÷ SB _n ); resistor (R ₁ ÷ R _n ). In this case, the clock buttons SB _{1 ÷ n are} connected to the DC power output (Output _pit ) by one contact. And other contacts tact buttons SB _{1 ÷ n are} connected to the inputs (Input. _{1 ÷ n} ) of the independent channels of the microcontroller U1 and through the corresponding resistance (R ₁ ÷ R _n ) to the ground.

. При этом катоды светодиодов VD_1÷n присоединены к выходам (Вых._1÷n) соответствующих независимых каналов микроконтроллера U1, а их аноды через соответствующие сопротивления

- к земле.Each of the display devices contains: LED (VD ₁ ÷ VD _n ); resistor

. In this case, the cathodes of the LEDs VD _{1 ÷ n are} connected to the outputs (Output _{1 ÷ n} ) of the corresponding independent channels of the microcontroller U1, and their anodes through the corresponding resistances

- to the ground.

The brightness control device for LED lighting can be used in conjunction with power sources that have a dedicated dimming input.

The device operates as follows.

When turned on, the power source 1 converts the input voltage to 5 volts DC output. After receiving power by the adjustment unit 2, its microcontroller U1 starts to execute the program laid down in it. The microcontroller program U1 provides for the appearance of a PWM signal of a certain duty cycle at the output control output. _control unit of adjustment 2. When the circuit of one of the buttons 3 _{1 ÷ n is} closed, the duty cycle of the PWM signal at the control output is Out. _control control unit 2 will change in accordance with the embedded program algorithm of the microcontroller U1. At the same time, on the independent output channels of the Output. _{1 ÷ n} a signal appears that energizes a specific indicator device 4 _{1 ÷ n} When the power is turned off and then turned back on and if there are no signals from the switching devices 3 _{1 ÷ n} at the control output of the Output. _control is generated PWM signal with the duty cycle of the last signal before turning off. PWM signal with control output _control via terminal K can be transferred to the LED driver of the LED lighting device.

Claims (1)

The brightness control device for LED lighting, containing a power source connected to the mains input, made in the form of an AC to DC converter, the output of which is connected to the power input of the adjustment unit, characterized in that the device is equipped with an equal number of switching and indicating devices, while the adjustment unit has inputs of independent channels, at least in terms of the number of switching devices and outputs of independent channels, in at least the number of display devices, each of which TV switching input connected to the DC voltage output of the control unit, one of the outputs to the input of the corresponding independent channel of the control unit, and the other output to the ground, with each of the indicating devices connected to the output of the corresponding independent channel of the control unit, and the output - to the ground, in addition, the adjustment unit at the control output has a terminal for connecting to the driver of the LED lighting device and is configured to form drove with a given duty cycle upon receipt of a signal at the input of the corresponding independent channel, and when re-connected to the network and the absence of signals at the inputs of independent channels, with the possibility of generating a signal with a duty cycle of the last signal before switching off.

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