RU207857U1 - LED LAMP DRIVER - Google Patents

Abstract

This utility model relates to power supplies for LED luminaires, in particular to drivers for LED luminaires. The technical result is to increase the reliability and durability of the LED lamp driver. In a preferred embodiment, a LED lamp driver is declared, containing a board, on which are located at a distance of at least 5 mm from each other: a rectifier configured to receive an alternating linear current and convert it to direct current; a switching LED control circuit associated with the rectifier and configured to generate an output constant current to the LED module; a control unit connected to the switching circuit of the LED driver, providing a PWM signal (broadband pulse modulation) to control the brightness of the LED module; a load regulator connected to the control unit and configured to adjust the output voltage , while the load regulator contains a passive power corrector, the output transformer of which consists of two identical transformers connected in parallel, and a capacitance for reducing low-frequency mains interference, which consists of two identical parallel connected capacitors.

Description

FIELD OF TECHNOLOGY

This utility model relates to power supplies for LED luminaires, in particular to drivers for LED luminaires.

LEVEL OF TECHNOLOGY

LED or light-emitting diode (abbr. LED from the English Light-emitting diode) is a semiconductor device with an electron-hole junction that creates optical radiation when an electric current is passed through it (http://ru.wikipedia.org/wiki/LED). LEDs in luminaires are controlled using a control board, which, as a rule, is a printed circuit board (PCB - Printed Circuit Board), which is connected via appropriate connectors to the LEDs themselves, or it itself carries the placed LEDs connected using contact tracks. The control board houses the LED lighting control elements and the power supply (LED driver).

In recent years, the LED element has been the focus of attention as a light source in a wide variety of lighting applications. The LED element has the advantages of less heat dissipation, lower power consumption, longer service life, higher impact resistance. In the case where appropriate power is supplied and the corresponding heat dissipation element is provided to the LED element, although the LED element has been used for 0.1 million hours or longer, the LED element can maintain a lit state without any damage. The optical output of all light sources gradually decreases over time. Since humans cannot tell the difference at 80% of the initial light intensity, the lifespan of an LED lighting element is currently expected to be approximately 40 to 50 thousand hours. Therefore, an LED element can be a light source with a much longer lifespan than an incandescent lamp with a lifespan of 1500 hours and a fluorescent lamp with a lifespan of 10 thousand hours.

Known LED light source (patent RU 113105, 01/27/2012), which is aimed at eliminating voltage surges, increasing the reliability and service life of LED lamps, reducing power consumption from a stationary AC network. The LED light source contains a voltage step-down converter, which is connected to at least one LED through a rectifier diode bridge, and a capacitive filter is connected in parallel with it between the rectifier diode bridge and the LED, the down-voltage converter is made of a chain of series-connected capacitors, where the rectifier diode the bridge is connected to break the chain of series-connected capacitors of the voltage converter.

There is a known driver for an LED lamp (patent RU 2735022 C1, 10/27/2020), which includes a board on which a network rectifier diode bridge, power switches, diodes, capacitors, an output current stabilization unit, a filter for suppression of common-mode and differential noise, current-measuring resistors, switchable discharge resistors, LED module, transformer, PFM / PWM power switch analysis and control unit, high-voltage capacitor. The driver additionally contains an EMC unit, consisting of a protection unit against high-energy microsecond impulse noise of more than 1500 V, including varistors, a thermistor and an arrester located on the printed circuit board, a common-mode and differential noise suppression filter, including chokes and capacitors. The protection unit against high energy microsecond impulse noise less than 1500 V consists of a capacitor, varistors and a surge arrester connected in parallel with the input power circuit. The output current stabilization unit includes a high voltage protection unit in the network, a thermal protection unit, a unit for analyzing and stabilizing the current through the LED module by controlling the power switch using the PFM / PWM algorithm. The primary winding of the transformer, current-measuring resistors and the power switch are connected in series to the input circuit, and the PFM / PWM algorithm for analyzing and controlling the power switch and the high-voltage capacitor are connected in parallel with the driver output. The output current stabilization unit additionally contains an output current ripple smoothing unit. The technical result is the creation of a driver with the function of protecting the LED lamp from voltage surges, increasing the power factor, increasing the efficiency of the driver, eliminating the pulsation of the output current.

The common disadvantages of the known solutions are their increased heat release, due to the fact that the elements on the board are unevenly placed, and also that it does not contain a passive power and capacitance corrector that reduces low-frequency network interference, which leads to a significant increase in the reliability and life of the LED lamp, and also allows you to reduce the weight and size characteristics of the device.

ESSENCE OF THE USEFUL MODEL

The claimed device is aimed at solving the technical problem inherent in the known solutions from the prior art.

The technical result is to increase the reliability and durability of the LED lamp driver.

An additional technical result consists in a significant decrease in temperature at the elements of the driver's output circuit, as well as in a decrease in the heat generated by the entire driver as a whole.

In a preferred embodiment, a driver for an LED lamp is declared, containing a board on which they are located at a distance of at least 5 mm from each other:

a rectifier configured to receive an alternating line current and convert it to direct current;

an LED control switching circuit associated with the rectifier and configured to generate an output constant current to the LED module;

a control unit connected to an LED driver switching circuit capable of generating a PWM (wideband pulse modulation) signal for controlling the brightness of the LED module;

load regulator connected to the control unit and made with the possibility of adjusting the output voltage, while the load regulator contains a passive power corrector, the output transformer of which consists of two identical transformers connected in parallel, and a capacitance for reducing low-frequency mains interference, which consists of two identical parallel-connected capacitors ...

In one of the particular examples of implementation, the driver additionally contains a temperature control unit connected to the control unit and configured to adjust the temperature depending on the brightness of the LED module.

In another particular example of implementation, the temperature control unit contains a microcontroller that regulates the formation of the PWM signal in the unit.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a general diagram of a declared driver.

IMPLEMENTATION OF THE USEFUL MODEL

As shown in FIG. 1 driver (10) of the LED lamp contains a printed circuit board (100), on which the main elements are located. In this case, the elements to reduce heat generation from them are placed at a distance of at least 5 mm from each other.

The driver (10) contains a rectifier (101), which ensures the reception of alternating line current from the 220 V network and its conversion into direct current. The rectifier (101) can be an AC / DC rectifier or a diode bridge. The rectifier (101) can be, for example, a full-wave or half-wave rectifier and can use diodes or other one-way devices to rectify the input signal.

A switching LED driving circuit (102) is coupled to a rectifier (101) and configured to generate a DC output current to the LED module (110). The control circuit (102) can be implemented as a stabilizer that generates a calibrated signal to control the LED module (110) with a current level within their tolerance. Also, the signal can be configured with ballast (eg, resistive, reactive and / or electronic ballast) to limit the current flowing through the LED module (110).

The control unit (103), connected to the switching circuit of the LED driver (102), generates a PWM (wideband pulse modulation) signal to control the brightness of the LED module (110). The PWM signal is generated with a given duty cycle. The control unit (103) is connected to the LED driving circuit (102) to provide the switching driver (10) with said PWM signal, whereby an output signal driven by said PWM signal is generated. Also, with the help of the control unit (103), PWM dimming can be realized by reducing the duty cycle of the supplied PWM signal to the control circuit (102) of the rated voltage and current.

The driver (10) contains a load regulator (104) connected to the control unit (103) and the LED control circuit (102), which provides the ability to adjust the output voltage, while the load regulator (104) contains a passive power corrector (1041), an output transformer which consists of two identical transformers connected in parallel, and a capacitance for reducing low-frequency mains interference (1042), which consists of two identical parallel-connected capacitors.

The use of a passive corrector (1041) as part of the load regulator (104) makes it possible to form an input current value proportional to the input voltage, i.e. create an active load. A feature of the proposed modification of the passive corrector (1041) is that its output transformer consists of two identical transformers connected in parallel, which makes it possible to distribute power more efficiently.

The load regulator also contains a capacitor for reducing low-frequency line noise (1042), which consists of two identical capacitors connected in parallel. Switching power supplies are sources of intense electromagnetic interference (EMF), because signals in pulse sources represent a periodic sequence of pulses. The spectra of such signals occupy a frequency range up to several megahertz wide. In this regard, it becomes necessary to protect pulse converters from external conducted noise penetrating through the network cable, as well as to suppress the arising noise induced on the supply network. This is due to the fact that the waveform of an alternating voltage of an industrial power supply network (~ '220 V, 50 Hz) for short periods of time can differ greatly from a sinusoidal one - surges or "insertions" are possible, a decrease in the amplitude of one or several half-waves, etc. ...

The driver (10) may additionally contain a temperature control unit (105) connected to the control unit (103), which provides temperature correction depending on the brightness of the LED module (110). The control unit (105) may contain a microcontroller associated with a temperature sensor that determines the current heating readings of the LED module (110) and the driver (10) itself, thereby correcting the formation of the PWM signal in the control unit (103), further increasing the reliability of the device.

Thus, a more efficient and reliable principle of the driver (10) for powering LED lamps is implemented, which provides increased reliability and excludes excessive heating of the device, thereby extending its durability.

Claims (7)

1. The driver of the LED luminaire, containing a board, on which they are located at a distance of at least 5 mm from each other: a rectifier configured to receive an alternating line current and convert it to direct current; an LED control switching circuit associated with the rectifier and configured to generate an output constant current to the LED module; a control unit connected to an LED driver switching circuit capable of generating a PWM (wideband pulse modulation) signal for controlling the brightness of the LED module; a load regulator connected to a control unit and a LED control circuit and made with the ability to adjust the output voltage, while the load regulator contains a passive power corrector, the output transformer of which consists of two identical transformers connected in parallel, and a capacitance for reducing low-frequency mains interference, which consists of two identical parallel-connected capacitors. 2. The driver of claim 1, which further comprises a temperature control unit connected to the control unit and configured to adjust the temperature depending on the brightness of the LED module. 3. The driver of claim 2, wherein the temperature control unit comprises a microcontroller for adjusting the PWM signal generation in the unit.

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