RU2789082C1 - Lighting system - Google Patents

Abstract

FIELD: lighting.

SUBSTANCE: invention relates to lighting engineering and pertains to a lighting system comprising at least two series-connected LED modules with the power source therefor connected to the first of the modules; the modules are located on a single control bus and are based on segments with individual touch control of each segment of the LED module; wherein LEDs, a secondary power source, and a reference power source are connected to the power source at the input to the first module; the secondary power source is linked with a touch plug and a control unit; the touch plug is linked with the control unit connected to the reference voltage source via a matching amplifier, wherein the control unit is connected to a transistor output stage connected to the current source of the LEDs for adjusting the illumination intensity, and the input plugs of the next module are linked with the output plugs of the previous module.

EFFECT: creation of an LED-based lighting system.

1 cl, 4 dwg

Description

The invention relates to lighting engineering, namely to the regulation of the intensity of illumination, and is intended to create LED lighting sources with controlled brightness.

Solutions are known according to patents RU 2670967, WO 2012/081878, RU 104409, RU 194838 in which the problem of adjusting the illumination of LEDs is solved.

However, they do not provide for the ability to turn on the backlight both completely and partially - in those areas where it is necessary.

The objective of the invention is to create a contactless (touch) control system for LED lamps for the optimal organization of additional and auxiliary lighting in residential premises (kitchen work area, niche lighting, lighting of recreation areas) with the ability to turn on the backlight both completely and partially - in those areas where necessary, as well as the ability to externally adjust the brightness of the backlight.

This technical result is achieved by the fact that the lighting system, consisting of at least two segments connected in parallel, each of which contains parallel chains of series-connected LEDs and a resistor, connected through the key transistor of the output stage to the power source, and a control unit, characterized in that that a capacitive sensor and a capacitive sensor control circuit are introduced into each segment, the control bus includes a line to turn off the LEDs of all segments and a line to turn on the LEDs of all segments, while in each segment the capacitive sensor control circuit is connected to the input of the control unit, the output of which is connected to the key transistor of the output cascade, in case of exposure for more than 1 second to the sensor of any switched off segment, the control unit of the specified segment generates a signal on the line for turning on the LEDs of all segments, in case of exposure for more than 1 second to the sensor of any switched on segment This control unit of the specified segment generates a signal on the line for turning off all segments.

The invention is illustrated by drawings, which is shown in:

fig. 1 - Block diagram of the organization of the lighting system (backlight) using lamps in the form of modules with individual touch control of each of its segments;

fig. 2 - block diagram of the module segment;

fig. 3 - Electrical circuit diagram of the module segment;

fig. 4 - Electrical diagram of the segment without brightness control of the LEDs.

Figures 1 and 2 show the following elements:

1 - Power supply DC 24V;

2 - Lamp 1;

3 - Lamp N;

4 - Panel 1-10V (option);

5 - Touch contact control circuit;

6 - Control unit;

7 - Secondary power supply = 5v;

8 - Reference voltage source + 10v (optional);

9 - Amplifier matcher (option);

10 - Output stage;

11 - LEDs, current source;

To create the necessary optimal lighting for the user, LED lamps are offered in the form of modules with individual touch control of each segment and the ability to turn on and off the entire lighting system with a sensor of any segment.

Module operation algorithm.

When the supply voltage is applied, all LEDs 11 of the module turn on once, the intensity of their glow gradually increases to the maximum, then the LEDs turn off smoothly for 1 second; This is the module's self-test mode. After that, the module goes into standby mode, the LEDs are off.

A short-term (0.5 sec.) impact on sensor 5 turns on/off the LEDs of the corresponding segment of the module. Thus, individual control of each segment of the module is carried out.

If the sensor is affected for a long time (more than 1 sec.) by any switched off segment of the module, all switched off segments of the module are switched on simultaneously.

In case of prolonged (more than 1 sec.) impact on the sensor of any enabled segment of the module, all enabled segments of the module are simultaneously switched off.

All switching on / off of LEDs occur with a smooth change in brightness, thanks to the use of PWM dimming technology.

The brightness of the module's LEDs is adjusted using the standard 1-10 V control method (option).

When the contacts of the switch S1 are closed, the AC 230V mains voltage is supplied to the power source, which begins to generate the voltage necessary to power the modules. after passing the self-test, the modules go into standby mode, the backlight is off.

Influencing the sensors for a short time, the user turns on / off the lamps partially or completely in those areas where it is necessary.

Prolonged action on the sensors controls the operation of the entire backlight according to the algorithm described above: any sensor located in the off area turns on the backlight completely; any sensor located on the included area turns off the entire backlight completely.

The illumination brightness of all modules is adjusted using an external control device - a standard 1-10 V panel (option).

DC 24V voltage is supplied to the input of the lighting SYSTEM, designed to power the LEDs and the control circuit. The secondary power source 7 provides power to the internal blocks of the device. The reference voltage source 8 generates a stabilized voltage necessary for the operation of an external device for controlling the brightness of the LEDs - a standard 1-10 V panel. When the supply voltage is applied, the control unit enters the self-test mode: a PWM signal is supplied to the output stage with a filling smoothly increasing from 0 up to 100%, and then gradually decreasing to 0%. The key transistor of the output stage opens, the supply voltage is applied to the LEDs. The intensity of the glow gradually increases to the maximum value, and then also smoothly decreases to the zero level. After that, the control unit goes into standby mode.

When exposed to a capacitive sensor, the logic level at the output of the control circuit / input of the control unit changes. The control unit generates a PWM output stage control signal with a filling that gradually increases from zero to a value proportional to the voltage at the output of the matching amplifier. This voltage is set by an external panel 1-10V and fed to the ADC of the control unit. The light intensity of the LEDs gradually increases to the value set by the user. In the absence of the control panel, the intensity of the glow of the LEDs increases to the maximum.

At the same time, the control unit analyzes the duration of the signal at the output of the sensor control circuit and in the event of a prolonged (more than 1 second) impact on the sensor, the control unit generates a signal on the control bus (“ON ALL” line), which causes all segments of the system to turn on.

At the next impact on the sensor, the filling of the PWM signal at the output of the control unit gradually decreases to 0%. The segment's LEDs go out. In case of prolonged (more than 1 sec.) impact on the sensor, the control unit generates a signal on the control bus (“OFF ALL” line). All segments of the system are switched off. Thus, the algorithm for controlling the backlight system is implemented: with a short exposure to any sensor, it is possible to turn on / off the LEDs of the corresponding segment, with a long exposure - all segments connected in parallel.

Input voltage DC 24V from an external voltage source is applied to the input connector (contacts XS2, XS5). Further, this voltage is fed through a protective diode VD2 and resistor R15 to the input of a secondary power source made on an integrated circuit DA1. Resistor R15 is quenching, part of the power is dissipated on it, thus facilitating the thermal regime of the DA1 microcircuit. The 5 V voltage obtained at the output of the source is used to power the control unit and the control circuit of the touch contact.

After the supply voltage is received, the control unit, made on the DD2 microcontroller, goes into self-test mode. PWM signal with filling, smoothly increasing from 0 to 100%, and then gradually decreasing to 0% from the controller port PB0 enters the output stage, made on the field effect transistor VT1, operating in the key mode. The intensity of the LED glow gradually increases to the maximum value, and then also gradually decreases to zero. Resistor R7, which connects the gate of the transistor VT1 to a common wire, keeps it closed to prevent the LEDs from turning on during the period of an undefined state of the controller outputs at the moment the power is supplied to the module.

LEDs HL1 - HL12 are grouped in 6 pieces and connected in series. The value of the forward current of the LEDs is determined by the value of the resistors R8, R9 connected in series with the LEDs.

The capacitive sensor control circuit is made on a DD1 chip. The microcircuit generates a control signal for the controller: when the touch contact is actuated, the high logic level at the output Q changes to a low one. When a low logic level appears at the PB1 input, the DD2 controller generates a PWM output stage control signal. With prolonged (more than 1 sec.) exposure to the sensor, the controller also generates a low-level signal on the “ON ALL” line (port PB4) or on the “OFF ALL” line (port PB3), depending on the previous state of the segment.

The brightness of the backlight is regulated by an external panel 1-10V. The external panel 1-10V is connected to the contacts XS1 and XS5 of the module with polarity. The reference voltage source for powering the panel is a parametric stabilizer with an output voltage of 10 V. It is made on the elements R10, VD1, C4. The matching amplifier is assembled on a VT2 transistor connected according to a common emitter circuit. The voltage generated by the panel is fed to the ADC of the microcontroller (port РВ2).

Elements C1, R1, R2 are installed if necessary and are designed to increase the noise immunity of the circuit.

If you do not need to control the brightness of the glow, the segment can be performed according to the scheme shown in figure 4. There are no elements that provide adjustment of the brightness level of the backlight, otherwise the operation of the circuit is similar to that described above.

Structural implementation.

Control elements and LEDs are mounted on a rigid double-sided printed circuit board made of fiberglass FR-4 with a thickness of 1.5 mm. The module consists of three identical segments connected in parallel and is a complete device for installation in a housing. overall dimensions of the module make it possible to use it for organizing auxiliary illumination of the kitchen working area. Connectors are installed on the board to connect the modules (luminaires). Double-sided tape on the bottom side of the board provides ease of installation and secure fixation.

Claims (1)

A lighting system consisting of at least two segments connected in parallel, each of which contains parallel chains of series-connected LEDs and a resistor connected to a power source through a key transistor of the output stage, and a control unit, characterized in that a capacitive sensor is introduced into each segment and a capacitive sensor control circuit, the control bus includes a line to turn off the LEDs of all segments and a line to turn on the LEDs of all segments, while in each segment the capacitive sensor control circuit is connected to the input of the control unit, the output of which is connected to the key transistor of the output stage, in case of exposure for more than 1 sec on the sensor of any switched off segment, the control unit of the specified segment generates a signal on the line for turning on the LEDs of all segments; signal on the line to turn off all segments.

Images