WO2017222411A1

WO2017222411A1 - Led lamp driver

Info

Publication number: WO2017222411A1
Application number: PCT/RU2016/000547
Authority: WO
Inventors: Артем Игоревич КОГДАНИН
Original assignee: Артем Игоревич КОГДАНИН
Priority date: 2016-06-24
Filing date: 2016-08-15
Publication date: 2017-12-28
Also published as: RU2016125294A

Abstract

The invention relates to a power supply circuit for LED lamps. In the claimed driver, a protective element which protects against common-mode, differential and micro-second pulse interference is configured in the form of an input-side electromagnetic compatibility assembly consisting of: a unit which protects against high-energy microsecond pulse interference of more than 1500 V, comprising variable resistors, thermistors and surge arresters; a filter for suppressing common-mode and differential interference, comprising impedance coils and capacitors; and a unit which protects against high-energy microsecond pulse interference of less than 1500 V and against power interruption to the driver, comprising variable resistors and thermistors, high-voltage diodes and protective diodes, a diode bridge and resistors. The driver further comprises an active power correction unit and a unit for stabilizing current across an LED module. The current stabilization unit contains an assembly for analyzing and stabilizing current to control a power switch according to a PWM/PFM algorithm, and a thermal protection assembly, which is connected to the assembly for analyzing and stabilizing current across an LED module and comprises an operational amplifier, thermistors and matching components.

Description

LED LIGHT DRIVER

Technical field

The present invention relates to lighting systems based on LEDs and to supply power to them, and in particular to a power circuit for LED lamps.

State of the art

LED lamp drivers should provide current limitation and to some extent carry out current control. LED current management includes two tasks: limiting the current in order to prevent thermal failure due to the increased temperature of the LED, and adjusting the current to maintain the LED current in a certain range to take into account fluctuations in the LED parameters and fluctuations in the input voltage of the LED lamp driver.

Another approach to creating a LED lamp driver was to use pulse width modulation (PWM) using feedback to measure the current of the LED array and actively control the current of the LED matrix.

The term "LED" as used herein to disclose the essence of the present invention is understood to mean any electroluminescent diode or other type of system based on injection / combination of charge carriers that is capable of generating radiation under the influence of an electric signal. Thus, the term “LED” includes, but is not limited to, various semiconductor structures that emit light in response to current, light emitting polymers, organic light emitting diodes (OLEDs), electroluminescent strips, and the like.

It should be borne in mind that LEDs can be configured (and / or controlled) with the ability to generate radiation with different bandwidths (for example, with full width at half maximum or duration at half amplitude) for a given range of the spectrum (for example, in a narrow frequency band, in a wide frequency band) and with a variety of dominant wavelengths that define the main color tone.

Known LED light source according to the patent for utility model N ° RU1 13105, which is aimed at eliminating power surges, improving the reliability and service life of the LED illuminator, reducing power consumption from a stationary AC network. The LED light source contains a step-down voltage converter, which is connected through at least one diode bridge to at least one a LED, and between the rectifier diode bridge and the LED, a capacitive filter is connected in parallel with it, the step-down voltage converter is made of a chain of series-connected capacitors, where the rectifier diode bridge is connected to the gap of the chain of series-connected capacitors of the voltage converter.

The disadvantage of this solution is: low power factor (less than 0.9), low efficiency, high dependence of the LED supply current on changes in the supply voltage of the 220V network, poor protection against microsecond pulsed noise of high energy, high ripple of the light flux, lack of protection against overheating.

A utility model is known according to patent N ° 128433, DRIVER FOR LED LIGHT, where the tasks of protecting the lamp from power surges, increasing power factor, eliminating ripple of the output current at a frequency of up to 1 kHz are solved / Driver for the LED lamp, which includes a board on which are installed network rectifier, power switch, diode, capacitors, analysis and stabilization unit of the output current by controlling the power switch of the output current stabilization circuit, while additionally installing s

- mains power connector (2),

- surge protector (3),

- common mode filter (4),

- the output voltage stabilization unit (7) by controlling the power switch according to the PFM / PWM algorithm (6),

- high-frequency step-down transformer (8),

- power switch (transistor) of the output current stabilization circuit (1 1),

- resistors for measuring current on an LED line (12),

- unit for analyzing the output voltage and transmitting the control signal (power switch) to the voltage stabilization unit

- the output voltage stabilization unit and the power switch are connected in parallel;

the diode and power switch are connected in series with each other and in parallel with the other elements of the circuit; a diode and one or two parallel-connected capacitors comprise a rectifier circuit; an output voltage analysis unit is connected in parallel with the rectifier circuit; block for analysis and stabilization of the output current, the power switch of the stabilization circuit of the output current are included in the serial circuit

The disadvantages of this solution are protection against microsecond impulse noise, which can withstand pulses up to 2 kV, lower efficiency (about 87%), and a limitation on the maximum power output to 70-80W

A known device LED driver according to the application US2016088702 is a prototype where the driver is connected to a preliminary controller, the main chain of LEDs, and the auxiliary part, which is configured to cause a short circuit of individual LED lines to ensure the most efficient driver configuration. A preliminary regulator provides an adjustable output voltage. An adjustable output voltage is supplied to the LED driver and allows the LED driver to provide a constant output power with virtually no ripple output power. Thus, the task is to provide an LED driver circuit in order to be able to control LEDs with wide input voltage, low harmonic distortion (HD), and high PF with small amounts of ripple. Previously, the controller 30 comprises a diode rectifier 301 and a power factor correction (PF) module 302. A diode rectifier 301 is connected to a power source, and is configured to convert an AC input voltage from a power source to a pulsating DC voltage. Power correction module 302 is connected between the diode rectifier 301 and the first output of the main chain of LEDs 10, which controls the ripple of the DC voltage. Pre-regulator 30 provides a wide input voltage range, high power factor PF and low HD. It should be noted that the pre-regulator 30 does not provide a controlled current output, instead of just having to provide an adjustable output voltage with some fairly small amount of ripple voltage.

The disadvantage of this solution is the lack of protection at the driver input from microsecond pulsed noise of high energy, the lack of protection against overheating, the absence of filters suppressing common mode and differential interference. When powering the LEDs from a high voltage (about 350-400V), without a inductor in the current stabilization circuit through the LEDs, the LEDs will be fed by a high-frequency pulse current, where the rate of rise and fall of the current will depend on the reaction rate of the current-regulating transistor and comparator.

SUMMARY OF THE INVENTION

The technical result to which the claimed invention is directed is the creation of a driver with the function of protecting the lamp from power surges, increasing power factor, increasing driver efficiency, eliminating ripple of the output current, protection against open circuit in the load circuit, protection against reverse polarity.

This technical result is achieved in that the driver of the LED lamp, which includes a board on which a network rectifier, power switch, diode capacitors, an analysis and stabilization unit of the output current is installed by controlling the power switch of the output current stabilization circuit, a surge protector, a filter common-mode interference, resistors for measuring current on an LED line, a unit for analyzing the output voltage and transmitting a control signal to a voltage stabilization unit, the stabilization unit output voltage, one or two parallel-connected capacitors make up the rectifier circuit, where the surge protection element and common-mode interference filter are made in the form of an electromagnetic compatibility input unit, consisting of a block of protection against high-power microsecond pulse interference, including high-voltage diodes, a diode bridge, resistors , varistors, arresters and combined elements from a varistor and a thermistor and a common mode and differential interference suppression filter, where combined elements, PT / RU2016 / 000547 resistors and high-voltage diodes are connected in series, and nodes from varistors and arresters are parallel to the input power circuit, and a common mode and differential interference suppression filter, including a radio noise filter, a rectifier diode bridge, with an auxiliary voltage constant voltage unit, which includes a circuit analysis and stabilization of the auxiliary voltage, high-frequency inductor and capacitor and the block of the active power corrector, including the high-frequency inductor, power switch, you a high-voltage rectifier diode, high-voltage capacitors, current-measuring resistors, and a current stabilization unit via LED modules with a current analysis unit for controlling the power switch using the PWM / PWM algorithm and current through the LED module, the high-frequency inductor, high-voltage diode, high-voltage capacitor connected in series, and the power switch current-measuring resistors and an analysis and control unit and a capacitor parallel to the driver output, and a high-frequency inductor and power switch, current-measuring p The resistors are connected in series, and the high-voltage diode, the analysis and control unit and the capacitor are parallel to the driver output, while the analysis unit is connected to the unit, which includes an operational amplifier, thermistors and a diode for coordination with the output current stabilization unit and the load break analysis unit and the output filter radio interference.

Brief Description of the Drawings

The invention is further explained in the description of the preferred embodiments with reference to the accompanying drawings, in which:

Figure 1-2 depict respectively a structural diagram;

Fig. 3 depicts a flowchart of a method for powering low-voltage LED constant current lamps

Figure 4 depicts a circuit diagram of surge protection for the driver of the LED lamp shown in Figure 1-2.

The scheme includes the following elements. Varistors (1), arresters (2), input common-mode and differential interference filter (3), radio interference input filter (4), resistors (5), high-voltage diodes (6), combined elements (7) consisting of a varistor and a thermistor, rectifier diode bridge (8), capacitor (9), high voltage capacitors (10), high-frequency inductor (1 1), increasing the active power corrector, including high-frequency inductor (12), power switch (13), high-voltage diode (14), high-voltage diode (15), power switch (16), high-frequency inductor (17), stabilization unit input current, radio interference output filter (18), diode bridge (19), current-measuring resistors (21) and a power switch analysis and control unit according to the PFM / PWM algorithm (23), current-measuring resistors (22), analysis circuit and stabilization of auxiliary supply voltage (24), high voltage capacitor (25). The claimed device operates as follows

An alternating voltage of the 220V network is supplied to the electromagnetic compatibility unit (26). In this node, in the protection block from microsecond pulsed interference of high energy of more than 1500 V (27) (hereinafter μs.ip.) and the block of protection against microsecond pulsed interference of large energy of less than 1500 V, the presence of μs. as part of the mains voltage 220V. In the presence of 220V microsec. amplitude from 300 to 1500V in the block of protection against microsecond pulsed interference of high energy less than 1500V is triggered in parallel connected combined elements. The combined element is a thermistor and a varistor soldered into one housing) and a decrease in the amplitude of the μs and. n. to a safe 300V voltage driver for operation. If the voltage of the network is 220V μs. and. with an amplitude of more than 1500 V up to 10 kV in the block of protection against microsecond pulsed high-energy pulses of more than 1500 V, the series-connected arrester and varistor are triggered and, thereby, the amplitude is reduced. to a value of 800V by power dissipation at the varistor, then μs.i.p. smoothes the chokes and capacitors in the common-mode and differential interference filter (28) and then enters the block of protection against microsecond pulsed high-energy pulses of less than 1500 V, the combined elements are triggered in parallel and the amplitude μs and decrease. n. to a safe 300V voltage driver for operation.

When the mains voltage passes through the common-mode and differential interference filter (28), noise is suppressed from the network, which can affect the driver’s operation, as well as to suppress interference into the 220V network to the established standards, to prevent influence on third-party devices connected to the same network as the driver.

Further, the alternating voltage is rectified by means of an AC / DC rectifier (29), which is a diode bridge. The rectified voltage is supplied to the auxiliary power supply unit (hereinafter VP unit) (30) and the Active power corrector unit (hereinafter referred to as AKM unit) (31).

The VP unit converts the rectified voltage into a 18V DC supply voltage for supplying logic circuits to the node for analyzing the voltage at the output of the power corrector and controlling the power switch (32) (hereinafter referred to as the Analysis and Control Unit of the ACM Block), the node for analysis and stabilization of current through the LED module (hereinafter the Analysis Unit) and stabilization of the STSM Block) and the Thermal Protection Unit.

In the ACM block, the rectified voltage is converted to an increased constant voltage of the order of 390V. The AKM unit analyzes the alternating voltage and the value of the voltage on the high-voltage capacitor and, through the PWM / PWM control of the power switch, maintains a voltage of about 390 V on the high-voltage capacitor, providing a power factor of more than 0.95.

From a high-voltage capacitor, an increased direct voltage is supplied to the current stabilization unit via an LED module (33) (hereinafter referred to as STSM unit). In the STSM block through PFM / PWM regulation occurs current stabilization through connected to the LED module. The analysis and stabilization unit of the STSM Block receives signals from the Load Break Analysis Unit (34), Thermal Protection Unit (35) and Current Setting Resistors and, based on the received signals, the Analysis and Stability Unit performs PWM / PWM control of the Power Key (36). In case of a break in the connection circuit of the LED module to the Driver, the load break analysis node sends a prohibiting signal to the Analysis and Stabilization Unit of the STSM Block and the Analysis and Stability Node stops switching PFM / PWM modulation, closes the Power Key and goes into standby mode of the enable signal from the Load Break Analysis Node (37). If there is no inhibitory signal from the Load Break Analysis Unit, the Thermal Protection Unit performs an analysis of driver heating. If the driver is heated above the maximum operating temperature caused by external factors, the Thermal Protection Unit sends a control signal to the Analysis and Stability Unit, after which the latter corrects the PWM / PWM control of the power switch and reduces the output current through the LED module to reduce overheating. If a decrease in current through the LED module does not affect the driver overheating, then a further decrease in current through the LED module occurs. If the repeated decrease again did not help to lower the driver temperature to a temperature below the maximum permissible, then the current will decrease again and so on until the driver temperature falls below the maximum permissible operating temperature. If necessary, the current can be reduced up to zero. At the same time, the Analysis and Stabilization Node stops switching the PFM / PWM modulation, closes the Power switch and goes into standby mode of the enable signal from the Thermal Protection Node.

An LED module is connected to the output of the STSM Block through the Common Mode and Differential Noise Cancellation Filter (37). The common-mode and differential interference suppression filter is used to eliminate impulse noise that can be radiated through the LED module when current flows through it.

When using the driver is achieved:

• operating range 160-265 V;

• brightness control input in the range from 0 to 100%;

• high reliability and driver efficiency (efficiency = 93%) on a wide

input voltage range with active step-up power corrector;

• combined two-level protection of the lamp from increased

supply voltage up to 600 V and surge protection up to 10 kV

50 μs in accordance with GOST R 51317.4.5-99 (IEC 61000-4-5-95) and driver emergency shutdown during overheating;

• protection against short circuit in the load, protection against open circuit in the load circuit, protection against reverse polarity.

• tested operating temperature range from -63 ° С to + 50 ° С; driver service life of up to 100,000 hours or more using electrolytic capacitors with an increased operating temperature range.

Claims

CLAIM

1. The driver of the LED lamp, which includes a board on which a network rectifier, power switch, diodes, capacitors, analysis and stabilization unit of the output current are installed by controlling the power switch of the output current stabilization circuit, a surge protector, common mode filter, resistors measuring current on an LED bar, an output voltage analysis unit and transmitting a control signal to a voltage stabilization unit, the output voltage stabilization unit being one or two in parallel for prison capacitors constitute a rectifier circuit, characterized in that

- the protective element from common-mode, differential and microsecond pulsed interference is made in the form of an input node of electromagnetic compatibility, consisting of a block of protection against microsecond pulsed high-energy pulses of more than 1500 V, including varistors and thermistors, a common-mode and differential interference suppression filter, including chokes and capacitors of the block of protection against microsecond interference of high energy less than 1500V and emergency power off of the driver in case of overheating or failure of it, including It includes varistors and thermistors, high-voltage and protective diodes, a diode bridge, resistors, where thermistors, resistors and high-voltage diodes, chokes are connected in series, and nodes from varistors and arresters, capacitors, varistors, protective diodes, a diode bridge are connected in parallel to the input power circuit ;

- a unit for stabilizing the current through the LED modules, which includes the analysis unit and stabilizing the current through the LED module by controlling the power switch using the PWM / PWM algorithm, with the high-frequency inductor, power switch, current-measuring resistors connected in series, and the analysis and control unit and the high-voltage capacitor in parallel driver output, thermal protection unit, necessary to reduce driver power to prevent overheating of the driver or LED module in at temperatures above the maximum permissible for their operation, which is connected to the analysis and stabilization unit through the LED module, which includes an operational amplifier, thermistors and matching elements

2. The driver according to claim 1, characterized in that the driver has screens made of aluminum sheets to reduce electromagnetic interference.