KR102444432B1 - remote power supply apparatus for LED - Google Patents

Abstract

The present invention receives a commercial AC power source from a main power device to output as DC power source, enables the DC power source to be transmitted from the main power device to a client power device that is remotely apart, enables a smoothing capacitor of a high capacity to be installed only in the main power device by enabling power to be supplied to an adjacent LED load on each client power device, and enables electric power efficiency to be improved by installing a smoothing capacitor of a small capacity in the client power device, thereby enabling a failure rate to be lowered and enabling installation costs to be reduced.

Description

LED lighting remote power supply apparatus

The present invention relates to an LED lighting remote power supply comprising a main power supply, a plurality of client power supplies connected to the main power supply, and LEDs connected to each of the client power supplies to be turned on. it's about

1 is a circuit diagram for explaining the configuration of a general LED power supply circuit.

The LED driving device shown in FIG. 1 is composed of a block including an EMI rectifying unit 10 , a power factor correction circuit unit 20 , and an LED driving circuit unit 30 . The EMI filter unit 10 serves to remove electromagnetic noise of the input/output signal, the power factor correction circuit unit (PFC) 20 serves to control the shape of the input current, and the LED driving circuit unit 30 is connected to the LED. It serves to supply a constant current. In the LED driving device, the output of the power factor correction circuit unit 20 outputs a DC voltage of about 400V, and at this time, a bulk capacitor (Cbulk), which is a large-capacity electrolytic capacitor for smoothing the output terminal, is connected. In addition, the general LED driving circuit may be configured with the power factor correction circuit unit 20 and the LED driving circuit unit having a DC/DC converter function.

Such a conventional LED driving device requires a bulk capacitor (Cbulk) for smoothing DC at the output terminal of each stage, and in particular, the bulk capacitor installed at the output terminal of the power factor correction circuit unit 20 requires a large value.

The reason why the large-capacity bulk capacitor (Cbulk) is installed in the capacitor installed at the output terminal of the power factor correction circuit unit 20 is that the input power of the power factor correction circuit unit 20 appears in the form of a square of a sine function, and the output power This is because the capacity of the bulk capacitor Cbulk for the purpose of smoothing between input and output must be increased accordingly.

Accordingly, the bulk capacitor Cbulk of the output terminal of the power factor correction circuit 20 of the LED driving device mainly uses an electrolytic capacitor. However, the lifespan of the electrolytic capacitor is very short compared to other semiconductor elements or components constituting the LED driving device and the LED chip, and the durability of the LED driving device is short due to the short lifespan of the electrolytic capacitor. There is a problem with losing.

In order to improve this problem, patent registration 10-1725640 (title of the invention: LED power supply) was developed to reduce the capacity of the bulk capacitor by suppressing the ripple of the current supplied to the LED load of the output stage, or to reduce the capacity of a plurality of loads. They did not solve the problems that occurred when they were installed.

In particular, when various types of LED module groups are connected in parallel to the power supply, the voltage applied to the smoothing bulk capacitor was inevitably large because the voltage was not properly supplied to each of these LED module groups. It had to be short-lived compared to the smoothing capacitors applied under a uniform load.

In particular, these smoothing capacitors are electrolytic capacitors, and although the LED module has a service life of 50,000 hours, a solution to this problem is required considering that the lifespan of the electrolytic capacitor is several thousand hours.

In addition, since the LED power supply device of the prior art has to be installed close to the LED load, if the LED load is installed in various places within a building, the LED power supply device must be installed as many as the number of installation places, and a large-capacity capacitor is required. By having to install a lot, not only the installation cost increases, but also a lot of failure factors are included.

The present invention is to solve the problems of the prior art, and the problem of the present invention is to configure a main power supply in which a high voltage large-capacity capacitor having a shorter lifespan than an LED is installed, and a plurality of client power supplies receiving power from the main power supply By forming a plurality of LED modules, each LED group consisting of a plurality of LED modules receives power from the client power supply, thereby reducing the number of high-voltage, large-capacity capacitors to reduce failure factors, and each client power supply By designing appropriate to the characteristics of the group, energy waste can be prevented and the lifespan of the power supply can be extended.

In addition, another solution of the present invention is to remotely supply power to the client power supply by reducing the voltage drop rate of the power supply line by installing the client power supply according to the separation distance of each LED group connected to the main power supply. in order to be able to supply it.

Another object of the present invention is to reduce a fire or personnel accident that may occur in case of a short circuit or short circuit because the power supply from the main power supply to the client power supply is supplied as DC.

A solution for solving the above problem includes: a main power supply device that receives commercial AC power, rectifies it, converts it into DC power, and outputs it, and a smoothing capacitor is installed at the output terminal; at least one or more client power supply devices installed in remote locations more than a predetermined distance from the main power supply device and having a client smoothing capacitor smaller than a capacity of the smoothing capacitor of the main power supply device installed at an output terminal; LED loads installed in each of the client power devices, the main power device comprising: an EMI filter unit for removing noise from the commercial AC power; a rectifying unit rectifying the output of the EMI filter unit; a PFC (Power Factor Correction) circuit unit receiving the output of the rectifier and improving the power factor; and a constant voltage circuit unit for controlling the output whose power factor is improved by the PFC circuit unit to a constant voltage and having the smoothing capacitor installed at the rear end, wherein the client power supply receives the DC power output from the main power unit and adjusts the power factor calibrating client PFC circuitry; a converter unit that receives the output of the client PFC circuit unit and outputs the converted voltage and current to match the capacity of the LED loads; a capacitor for smoothing the output of the converter unit and supplying it to the LED load; an inductor (L2) coupled to the choke coil in a reverse direction; dividing resistors for dividing the output voltage of the inductor (L2); a PFC dedicated chip for generating a PWM waveform by receiving the voltage divided by the voltage dividing resistors, and generating a driving waveform by comparing the PWM waveform with a reference waveform; and a switching element for switching the current flowing through the inductor L2 according to the driving waveform.

In addition, in the present invention, the main power supply is provided with a control unit for generating a dimming command signal for controlling the brightness of the LED loads and an emotional lighting signal for controlling the color, and in the client power supply devices, the LED according to the control signal of the control unit Preferably, a client control unit for controlling the brightness and color of the loads is installed.

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According to the present invention having the above problems and solutions, when a plurality of LED loads of different capacities are installed in isolation from each other, the capacity of the smoothing capacitor according to each power supply is not increased, and the main power supply and the main It receives DC power from the power supply and configures the client power supply designed to fit each load capacity and adapts it to individual LED loads, so that the smoothing capacitor of the client power supply can be configured with a small capacity, thereby extending the lifespan. And it is possible to configure a power supply device that is easy to repair.

1 is a circuit diagram for explaining the configuration of a general LED power supply circuit.
2 is a circuit block diagram for explaining the present invention.
3 is a circuit block diagram of the main power supply of the present invention.
4 is a circuit diagram of a client power supply device of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit block diagram for explaining the present invention.

The embodiment shown in FIG. 2 is a main power supply device 100 that receives AC 220V, which is commercial power, rectifies, and converts it into DC 300~500V, and outputs the DC output of the main power supply 100 to a DC line 102 ), the client power supply 1~ client power supply n, and the LEDs 1, 2,..., n loads that are lit by receiving power from the client power unit 1~ client power supply n, respectively.

At this time, the LED1, 2,..., n loads consist of a plurality of LED modules, and each LED module has a red (Red), green (Green), and blue (Blue) light emitting unit, and each light emitting unit It has a configuration that can emit light independently or in combination with each other to emit light.

A controller is installed inside the main power supply device 100, and the controller is connected to an input unit 101 for receiving an illuminance control input signal or an illumination color signal for emotional lighting, and according to the input of the input unit 101, it is connected to the controller. The generated control signal is transmitted to each of the client power supply devices 1 to n along the control line 103 .

In addition, since the DC power output from the main power supply device 100 is output at 300 ~ 500V, the remote location more than a preset distance, in order to maximize the effect of the present invention, the LED load of the remote location, LED1,2 , ... Since it is supplied to the client power supply devices 1, 2, ... n of LEDn, the voltage drop rate is lowered compared to the case where power is transmitted by the 9-12V DC power supply, thereby achieving efficient power transmission.

The minimum set distance of the separation distance of the client power device from the main power supply device 100 is determined by the voltage value output from the main power supply device 100, the resistance value of the power line to be connected, and the number of modules of the LED load connected.

If a low-voltage DC power of about 9V that is normally supplied to the LED load is supplied by the main power supply device 100, the voltage drop rate of the line is very high compared to the input power until the power reaches the remote LED load. The LED load cannot be turned on, and even if the LED load can be turned on by supplying power at several tens of volts from the main power supply device 100, not only the separation distance is limited, but also the power transmission efficiency is lowered by the voltage drop. . In consideration of this point, the output voltage of the main power supply device 100 is preferably a DC voltage of 300 ~ 500V.

In addition, in the main power supply 100 , a bulk capacitor made of a relatively expensive electrolytic capacitor or tantalum capacitor with a capacity of several tens to several hundred μF is used in order to smooth the power of the output stage. At this time, since the service life of the electrolytic capacitor or the tantalum capacitor is about 1000 hours, it can be said that it is very short compared to the LED loads having a service life of 50,000 hours.

For this reason, the bulk capacitor is used only in the main power supply 100, and the bulk capacitor is not used in the client power supply 200, and the client power supply 200 is optimized for the connected LED loads and is powered by an IC integrated circuit. It is desirable to allow this to be controlled.

3 is a circuit block diagram of the main power supply of the present invention.

The main power supply device 100 removes instantaneous transient voltage and parasitic or capacitive noise caused by high-frequency noise or lightning mixed with AC power and prevents malfunctions that may occur from external noise in advance. The EMI filter unit 110, the rectifier unit 120 for rectifying the input AC voltage, and the pulsating voltage waveform are chopped to improve the power factor of the inductive or capacitive load regardless of the fluctuation of the AC input voltage, thereby increasing the voltage and A PFC (Power Factor Correction) circuit unit 130 installed to match the phase difference of the current waveform, and a constant voltage circuit unit ( 140) and, according to the input signal of the input unit 101, dimming the LED brightness to the client power supply, a dimming command signal, and the LED load to control the color of the R, G, and B lights to control the emotional lighting It consists of a control unit 160 that generates an emotional lighting signal for directing and outputs it to the control line 103 .

4 is a circuit diagram of a client power supply device of the present invention.

The client power supply device 1 includes a PFC circuit unit 201 for correcting the power factor of the DC power input through the DC line 102, and the capacity of the LED load D1 connected to the rear end of the power input through the DC line 102. The converter unit 202 transforms and outputs the voltage and current according to A client control unit 203 that changes the voltage and current output from the converter unit 202 and emits light of a specific light emitting unit among the R, G, and B light emitting units of each LED module of the LED load, and the converter unit 202 It consists of a capacitor C1 of a small capacity which is reduced by 1/5 to 1/1000 times than the capacity of the bulk capacitor for smoothing installed at the output terminal of the main power supply device 100, which is installed to smooth the output from the LED D1 and supply it to the LED D1.

At this time, if the DC power input to the client power supply 1 is a power suitable for lighting the LED1, the converter unit 202 is unnecessary, and in this case, the converter unit 202 does not need to be configured, so the cost is very low. to configure the client power supply.

5 is a detailed circuit of the PFC circuit unit applied to the present invention.

The DC power supplied from the main power supply device 100 is smoothed by the choke coil L1 and the smoothing capacitor C1 to be supplied to the LED load, and a change in the amplitude of voltage and current occurs in the supplied power source, and the voltage , when the phase difference of the current waveform is generated, the power factor is improved by operating the FET (Q1), which is a switching element, in the direction of narrowing the phase difference by the PFC dedicated chip (U2). One end of the choke coil (L1) is connected through a DC line and a diode (D1), the other end is coupled to the (-) terminal of the LED, and the choke coil (L1) has an inductor (L2) in the reverse direction of the choke coil (L1). is coupled to form a directional coupler that lowers the return loss, the voltage induced in the inductor L2 is divided by the voltage dividing resistors R5 and R6, and the divided voltage is input to the PFC dedicated chip U2 and PWM A waveform is generated, and the PWM waveform is compared with the waveform stored inside the PFC dedicated chip U2 to generate a driving waveform. The driving waveform output from the PFC dedicated chip U2 drives the FET Q1 to change the current flowing in the inductor L2 dp to improve the power factor.

100: main power supply
101: input unit
102: DC line
103: control line
110: EMI filter unit
120: rectifying unit
130: PFC circuit unit
140: constant voltage circuit unit
160: control unit
201: PFC circuit part
202: converter unit
203: client control unit

Claims (5)

a main power supply device that receives, rectifies, converts, and outputs commercial alternating current (AC) power into DC power and has a smoothing capacitor installed at the output terminal;
at least one or more client power supply devices installed in remote locations separated from the main power supply by a predetermined distance or more and having a client smoothing capacitor smaller than a capacity of the smoothing capacitor of the main power supply unit installed at an output terminal;
Includes LED loads installed in each of the client power supplies,
The main power supply is
an EMI filter unit for removing noise from the commercial AC power;
a rectifying unit rectifying the output of the EMI filter unit;
a PFC (Power Factor Correction) circuit unit receiving the output of the rectifier and improving the power factor;
and a constant voltage circuit unit for controlling the output of which the power factor is improved by the PFC circuit unit to a constant voltage and having the smoothing capacitor installed at a rear end thereof,
The client power supply
a client PFC circuit unit for receiving DC power output from the main power supply and correcting the power factor;
a converter unit that receives the output of the client PFC circuit unit and outputs the converted voltage and current to match the capacity of the LED loads;
and a smoothing capacitor for smoothing the output of the converter and supplying it to the LED load,
The PFC circuit of the client
a capacitor and a choke coil installed to smooth the DC power output from the main power supply;
an inductor (L2) coupled to the choke coil in a reverse direction;
dividing resistors for dividing the output voltage of the inductor (L2);
a PFC dedicated chip for generating a PWM waveform by receiving the voltage divided by the voltage dividing resistors, and generating a driving waveform by comparing the PWM waveform with a reference waveform;
and a switching element for switching the current flowing through the inductor (L2) according to the driving waveform. The method according to claim 1, The main power supply is provided with a control unit for generating a dimming command signal to control the brightness of the LED loads and an emotional lighting signal to control the color, and the client power supply unit is the control signal according to the control signal LED power supply, characterized in that a client control unit for controlling the brightness and color of the LED loads is installed.

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