KR20140124294A - Converter for LED emergency lapm - Google Patents

Abstract

The present invention relates to an LED emergency light converter. More specifically, the LED emergency light converter is capable of: preventing an LED-ON failure that may be caused by a no-load status generated by late operation of a second switching unit due to a deviation in an operation time between a first switching unit to connect a battery and a DC/DC converter unit in a blackout and the second switching unit to connect the DC/DC converter unit and an LED module; detecting a battery voltage to prevent overdischarge of the battery when the battery voltage is less than or equal to a discharge final voltage and to allow a recycle (recharge) of the battery; and lowering a voltage, which is outputted to the battery by a constant voltage unit in a test, to prevent a malfunction. Furthermore, the DC/DC converter unit is capable of: supplying stable power to the LED module; and lowering a current supplied to the LED module when a certain time is elapsed to extend the lighting time. The LED emergency light converter according to the present invention comprises: a battery; a direct current unit to convert inputted commercial power to direct current power to charge the battery; a DC/DC converter unit to turn on an LED by power discharged from the battery; a first switching unit to connect the battery and the DC/DC converter unit if an input of the commercial power is blocked, and a second switching unit to connect the DC/DC converter unit and an LED; and a no-load preventing unit to prevent the DC/DC converter unit from being a no-load status before the second switching unit is operated after the first switching unit is operated.

Description

Converter for LED emergency lapm}

The present invention relates to an LED emergency light converter, and more particularly, to an LED emergency light converter that includes a first transfer unit for connecting a battery and a DC / DC converter unit during a power failure, a second transfer unit for connecting the DC / DC converter unit and the LED module, The second switching unit is operated in a late state to be in a no-load state, thereby preventing the LED from being turned on and detecting the voltage of the battery to prevent over discharge of the battery when the voltage reaches the discharge end voltage. The present invention relates to an LED emergency light converter that prevents a trouble and prevents a malfunction of an LED module by lowering a voltage output from a constant voltage unit to a battery during a test using a test switch. LED emergency light that can supply stable current to the module and extend the lighting time by lowering the current supplied to the LED module after a certain period of time It relates to the butter.

As is known, an emergency light is normally turned on by a commercial power supply, and when an emergency such as a power failure occurs, it is illuminated by a power source of the built-in battery to prevent darkening of the room or guide the evacuation direction.

LEDs have a variety of advantages such as high illumination, low power consumption, semi-permanent lifetime, environmentally friendly, and emotional lighting, and are now being used as light sources for emergency lighting.

Prior art No. 0896529 entitled " Emergency Power Supply Device for LED Lighting ", Registered Patent No. 1216570 "LED Fluorescent Lamp with UPS means" and the like have been disclosed in the prior art relating to LED emergency light converters so that LEDs can be turned on during a power failure .

The LED emergency light converter generally includes a battery, a charging unit (DC unit) for charging the battery with a commercial power at normal times, a DC / DC converter unit for converting a power source for discharging the battery into a power source suitable for lighting the LED, A first transfer unit for connecting the battery and the DC / DC converter unit when a power failure occurs, and a second transfer unit for connecting the DC / DC converter unit and the LED module.

The first transfer part and the second transfer part normally use a relay which is electrically not only electrically but also physically on-off reliably. The first transfer part and the second transfer part are difficult to operate simultaneously and a slight time difference occurs.

At this time, the following problem may occur when the second switching unit is operated late.

First, when the first switching unit is operated and the power of the battery is supplied to the DC / DC converter unit, the second switching unit does not operate and the DC / DC converter unit is not loaded (that is, the LED module is connected to the DC / ). When no load is applied, the emergency light converter detects an overvoltage and the non-flash converter is shut down and stops operating.

Second, the recent emergency light converter has a function of preventing over discharge of the battery and preventing damage to itself and the LED module, so that the output overvoltage protection function is operated in the no-load state to stop the operation, If no load is applied, the operation is not performed, and even if the second transfer unit is operated late, the operation is not started and the LED may not be turned on.

The emergency light converter has a test unit for operating the first change-over unit and the second change-over unit in a state in which the commercial power supply is being input, for checking whether the normal change-over unit is normally operated.

However, this test is performed in a state in which the commercial power is normally supplied, so that the following problems may occur.

When the charging line for charging the battery and the discharging line for discharging the power supply of the battery are connected,

Even if the battery is not separated and supplied to the DC / DC converter unit, since the power for charging the battery is supplied to the DC / DC converter unit through the charging line, the LED module may faintly light up and malfunction.

It is important that the emergency lights stay on for a long period of time in case of a power failure so that more people can be evacuated. However, since the capacity of the battery is limited, it is necessary to extend the lighting time within the capacity of the battery.

In order to solve the problems of the LED emergency converter according to the prior art as described above and to meet the required need, the present invention provides an LED emergency converter in which the operation time of the first transfer part and the second transfer part, It is possible to prevent an accident that the converter (more specifically, the DC / DC converter unit) is damaged due to no load, or that the LED does not light up, and it is possible to prevent a malfunction in the test for checking whether the converter is normal, And to provide a LED emergency light converter that can keep the lighting time longer.

According to an aspect of the present invention, there is provided an LED light-

battery;

A direct current part for converting the input commercial power into direct current power to charge the battery;

A DC / DC converter unit for turning on an LED with a power source discharged from the battery;

A first switch for connecting the battery and the DC / DC converter when the input of the commercial power is interrupted; a second switch for connecting the DC / DC converter to the LED;

And a no-load preventing unit for preventing the DC / DC converter unit from becoming a no-load state before the second transferring unit is operated after the first transferring unit is operated.

A separation sensing unit for sensing whether the battery is detached,

And a battery protection unit for detecting a voltage of the battery and opening the DC / DC converter unit when the voltage reaches a discharge end voltage to prevent an over discharge.

A test unit for forcibly operating the first transfer unit and the second transfer unit to test normal operation;

A constant voltage unit configured to supply a voltage output from the direct current unit to a constant voltage;

And a down unit for lowering the output voltage of the constant voltage unit during the test of the test unit,

The DC / DC converter unit

A boost coil L1 for boosting a power source discharged from the battery,

A step-up transistor (Q2) for switching and causing the step-up coil (L1) to be stepped up,

A discharge transistor Q5 for turning on and off the discharge of the battery when an overvoltage or an overcurrent is detected,

And a microcomputer (U101) for controlling the step-up transistor (Q2) and the discharge transistor (Q5).

The LED emergency light converter according to the present invention having the above-described configuration prevents an accident that the emergency light converter is damaged or the LED is not turned on due to an operation time deviation between the first transfer unit and the second transfer unit during a power failure, The DC / DC converter unit does not operate due to the absence of the battery or the complete discharge during the test for preventing the malfunction that the notification lamp is turned off. In the initial stage of the power failure, the LED is brightly turned on, To extend the lighting time of the LED to secure more time for more people to evacuate and to prevent the over discharge of the battery by stopping the discharge immediately when the voltage of the battery drops below the discharge end voltage, It is an invention that is very useful for industrial development because it is miniaturized and has excellent competitive power by reducing heat generation.

1 is a schematic block diagram of an LED emergency converter according to the present invention;
2 is a circuit diagram of an LED emergency converter according to the present invention;

Hereinafter, the LED emergency converter according to the present invention will be described in more detail with reference to the drawings.

Before describing the present invention in detail,

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1, the LED emergency light converter according to the present invention includes an LED module, a battery, a DC unit 10, first and second switching units 21 and 22, a no-load preventing unit 30, a battery protecting unit 40, The test section 50, the constant voltage section 60, the down section 70, the DC / DC converter section 80, and the display section 90.

The operation of these components will be briefly described as follows.

The normal converter 3 is operated to supply power to the LED module 1 so that the LEDs are turned on so that the emergency light converter 5 of the present invention can be supplemented Allow the battery to remain fully charged by the charging method.

The first switch 21 and the second switch 22 are connected to the battery B and the DC / DC converter 80, the DC / DC converter 70, and the DC / DC converter 70, respectively, The LED module 1 is connected to the LED module 1 and the LED of the LED module 1 is turned on by the power of the battery.

The direct current unit 10 receives a commercial power and generates a power source for operating the emergency light converter 5 and a direct current power source for driving the first and second transfer units 21 and 22, The power source charges the battery B through the constant voltage unit 60.

When the commercial power is supplied, the first and second switches 21 and 22 are turned on and the DC / DC converter 80, the DC / DC converter 80, and the DC / And electrically connects the converter unit 80 and the LED module 1. [

The no-load preventing unit 30 prevents the DC / DC converter unit 80 from being in a no-load state due to a variation in operation time between the first switch unit 21 and the second switch unit 22, Thereby preventing damage to the unit 80 and preventing an accident that the LED does not light up.

The battery protecting unit 40 detects whether the battery is disconnected and whether the voltage of the battery is lower than the discharge end voltage. When the battery is separated and removed, So that the discharge of the battery is stopped to prevent over discharge.

The test unit 50 forcibly operates the first and second transfer units 21 and 22 to turn on the LEDs as a power source of the battery during a test for checking whether the emergency light converter 5 operates normally.

The constant voltage unit 60 charges the battery B by making the direct current power outputted from the direct current unit 10 constant voltage and blocks the charging current automatically when the battery B is charged, When the voltage drops, the charge current is automatically supplied to keep the battery fully charged at all times.

The down unit 70 lowers the voltage (current) output from the constant voltage unit 60 during the operation of the test unit 50 for inspection and outputs an abnormality (for example, separation, over discharge) to the battery B The LED does not light up or the red LED of the display unit 90 is turned off.

The DC / DC converter unit 80 boosts a power source for discharging the battery in an emergency such as a power failure, converts the voltage into a voltage and a current suitable for lighting the LED, and supplies the converted voltage and current to the LED module 1, When no load is applied or an overcurrent flows, the operation is stopped and protected. At the initial stage of the discharge of the battery, the LED is turned on at a high illuminance, and when a certain period of time is elapsed, the illuminance is lowered,

When the power is supplied from the direct current unit 10, that is, when the commercial power is input, the green LED is turned on to inform the display unit 90 of the fact that the battery is detached from the battery protecting unit 40, The red LED lights up when the sensor is detected.

Hereinafter, the LED emergency light converter 5 according to the present invention will be described in detail with reference to the circuit diagrams of FIGS. 2 to 4. FIG.

2 is a circuit diagram of the DC part 10 and the test part 40. As shown in FIG.

Hereinafter, the circuit configuration of the direct current unit 10 from the input side (left side in the figure) where the commercial power is input will be described.

A fuse F1 for protecting the converter by blocking the overcurrent when the overcurrent is inputted to the commercial power supply and a varistor MOV1 for protecting the converter by clamping the instantaneous overvoltage, that is, the surge voltage, .

Behind the varistor (MOV1) are connected bridge diodes (D1 to D4) for full-wave rectification of a commercial power source into a pulsating current source, and a capacitor (C24)

A transformer T1 for reducing DC power is connected to the rear of the capacitor C24 and a commercial power source DC is provided between the capacitor C24 and the transformer T1 so that the transformer T1 is stepped down. And a switching unit 11 for switching in a PWM manner is connected.

The switching unit 11 receives a voltage (current) input to the transformer T1 and a voltage (current) output to the transformer T1 and controls switching based on the voltage (current) to generate a constant voltage and a constant current Power is output.

A diode D15 and a capacitor C26 are connected behind the transformer T1 for rectifying and smoothing the power supplied to the transformer T1 and transforming it into DC.

The feedback unit 13 is connected to the DC unit 10 to generate and output a constant voltage and a constant current by sensing the voltage and current generated in the DC unit 10 and feeding back the voltage and current to the switching unit 11. [

Behind the feedback unit 13, a capacitor C12 and a diode D17 which are smoothed and rectified once again are connected.

A green LED 91 is connected to the output side of the direct current unit 10 as a display unit 90 indicating whether or not commercial power is supplied and the first switch unit 21 and the second switch unit 22, The drive coils RY1-B and RY2-B (see Fig. 3) are connected.

The test section 40 is driven by the power supplied from the direct current section 10 and the direct current section 10 is driven by the first transfer section 21 and the second transfer section 22 21 and the second change-over unit 22 by forcibly turning off the power supply to the drive coils RY1-B and RY2-B (see FIG.

The test unit 40 includes a transistor Q1 for turning on and off the power supply to or from the drive coils RY1-B and RY2-B (see FIG. 3), and an operator manually pressing the transistor Q1 And a wireless check unit 41 for turning off the transistor Q1 in response to an inspection signal from the remote controller.

The following description will be made with reference to Fig.

The constant voltage unit 60 charges the battery by making the output power of the direct current unit 10 constant voltage.

The constant voltage unit 60 includes a transistor Q5 and a shunt regulator Reg1 for turning on and off the transistor Q5 so that a constant voltage is output. The shunt regulator Reg1 divides the output voltage of the DC unit 10, And two resistors R18 and R20 to be applied as a trigger signal to the first transistor Reg1. The shunt regulator Reg1 turns on and off the transistor Q4 by the output voltage of the dc section 10 sensed and voltage-divided by the two resistors R18 and R20 and outputted from the constant voltage section 60 So that the voltage supplied to the battery B is kept constant (i.e., the voltage is constant).

When the voltage of the battery B becomes equal to the output voltage of the constant voltage unit 60 due to the full charge of the battery B, the constant voltage unit 60 no longer supplies the charging current to the battery B Prevent overcharge of battery.

The down unit 70 is connected in parallel to the two resistors R18 and 20 of the constant voltage unit 60 to measure the intensity of the voltage output from the constant voltage unit 60 when the test unit 50 performs the test operation Down. In other words, the shunt regulator Reg1 turns off the transistor Q4 at a lower voltage by lowering the voltage intensity of the direct current part 10 sensed by the voltage of the two resistors R18 and R20, The output voltage of the constant voltage section 60 is lowered.

The down unit 70 includes a transistor Q3 for turning on the voltage applied to the two resistors R18 and R20 that is turned on during the operation of the test unit 50 and triggers the shunt regulator Reg1, And resistors R23, R24 and R34 for stable operation of the transistors Q3 and Q3.

The down unit 70 prevents a malfunction when checking the normal operation of the emergency light converter 5 of the present invention through the test unit 50.

In other words, in the test, when the commercial power is normally supplied, the battery B and the DC / DC converter unit 80 are forcibly connected, so that the battery B and the DC / DC converter unit 80 operate normally, A test is made as to whether the LED of the display lamp 90 is turned on and whether the red LED 93 of the display lamp 90 is turned on and displayed when there is an abnormality. B is connected to the charging line CL so that the power outputted from the constant voltage unit 60 is supplied to the DC / DC converter unit 80 through the charging line CL and the discharging line DL To cause a malfunction at the time of testing.

For example, if the battery is not connected, or if the battery is completely discharged and there is no power to discharge the battery and the battery can not be charged (in this case, the battery is not connected), the test unit 50 The LED of the LED module 1 is not turned on and the red LED 93 of the display unit 90 is turned on because the battery B is not discharged from the battery B even when the battery B is operated. The LED of the LED module 1 may be turned on by being supplied to the DC / DC converter unit 80 through the charging line CL and the discharge line DL. Of course, the output voltage of the constant voltage unit 60 transmitted to the DC / DC converter unit 80 is weak and will be dimly lit even if it is lit, but the lighting itself is a malfunction for the test.

The down unit 70 lowers the voltage output from the constant voltage unit 60 during the test and causes a malfunction due to the power outputted from the constant voltage unit 60 during the test through the test unit 50 as described above Eliminate possibilities.

The battery protecting unit 40 includes a detachment sensing unit for sensing whether the battery B is detached or not and an overdelivery sensing unit for sensing whether the battery B is overdischarged.

The separation sensing unit receives a reference voltage as an inverting terminal (-) and receives a voltage of the battery as a non-inverting terminal through the two resistors (R9 and R7) U3-B). When the battery is not connected, the first comparator U3-B outputs a high signal to turn on the red LED 93 of the display unit 90 to notify the administrator thereof.

The overdischarge detector receives a reference voltage as a non-inverting terminal (+) and receives a voltage of the battery as a non-inverting terminal through the two resistors (R21 and R25) And a second comparator U3-A. The second comparator U3-A outputs a high signal when the voltage of the battery is equal to or less than the discharge end voltage, thereby lighting up the red LED 93 of the display unit 90 to inform the manager thereof. The second comparator U3-A turns on the transistor Q6 to turn off the discharge transistor Q5 of the DC / DC converter unit 80 when the voltage of the battery is lower than the discharge end voltage, DC converter unit 80 so as to prevent the battery from discharging any more, thereby preventing overdischarge.

The first switch 21 and the second switch 22 are connected to drive coils RY1-B and RY2-B for generating electromagnetic force when the power is turned on and drive coils RY1-B and RY2- And magnet switches RY1-A and RY2-A which are switched by an electromagnetic force generated in the magnetostrictive mode. That is, the first switch unit 21 and the second switch unit 22 use a relay that is physically turned on and off as well as electrically.

The two drive coils RY1-B and RY2-B are supplied with power from the DC unit 10 during normal operation when commercial power is supplied, and the two magnet switches RY1-A and RY2- DC converter unit 80 is not connected to the battery B and the LED module 1), and when the supply of the commercial power is cut off due to a power failure, the electromagnetic force disappears, The DC / DC converter unit 80 is connected to the battery B and the LED module 1 so that the two magnet switches RY1-A and RY2-A are turned off.

The non-load preventing unit 30 is configured such that, during a power failure, the second transfer unit 22 is operated by the first transfer unit 22 due to the operation time deviation of the first transfer unit 21 and the second transfer unit 22 using the relays, DC converter unit 80 is prevented from being brought into a no-load state by operating later than the DC / DC converter unit 21.

When the first switch unit 21 is operated first in the operation of the first switch unit 21 and the second switch unit 22 due to the power failure, The converter unit 80 may be damaged before outputting an overvoltage due to a no load state before the second transfer unit 22 is operated and the microcomputer U101 of the DC / So that the LED module 1 can be prevented from being turned on by stopping the operation in the no-load state and determining that the second change-over unit 22 operates late even if the operation is stopped.

In order to prevent the DC / DC converter unit 80 from becoming a no-load state due to the operation time deviation of the first switch unit 21 and the second switch unit 22, 30 are connected in parallel to the magnet switch RY2-A of the second change-over unit 22. [

The no-load preventing unit 30 uses the diode D6 and the DC / DC converter unit 80 and the LED module 1 before the magnet switch RY2-A of the second change- To prevent the DC / DC converter unit from becoming no-load state, and does not perform any function after the magnet switch RY2-A is turned on.

The DC / DC converter unit 80 boosts a power source discharged from the battery, converts the power source into a voltage and current suitable for lighting the LED of the LED module 1, and supplies the voltage and current.

The DC / DC converter unit 80 includes a boost coil L1 for boosting a power source discharged from the battery, a boost transistor Q2 for switching to boost the voltage at the boost coil L1, A diode D5 and a capacitor C4 for rectifying and boosting the power supplied from the power source Q2 and smoothing the voltage to be constant and suitable for lighting the LED and a capacitor C4 for turning on and off the discharge of the battery when an overvoltage or an overcurrent is sensed, (Q5), and a microcomputer (U101) for controlling the step-up transistor (Q2) and the discharge transistor (Q5).

FIG. 4 shows a microcomputer U101 of the DC / DC converter unit 80 and its peripheral circuits.

The microcomputer U101 senses the intensity of the voltage discharged by the battery B through the terminal No. 1 and controls the current boosted by the step-up transistor Q2 through the terminal No. 8 to two stages, Off switching of the step-up transistor Q2 through the sixth terminal, controls on-off switching of the discharge transistor Q5 through the sixth terminal, and supplies the voltage supplied to the LED module 1 through the fifth terminal And senses the current supplied to the LED module 1 through the terminal 4 (output after the supply).

The microcomputer U101 controls the switching of the step-up transistor Q2 with the voltage and current sensed at the first terminal, the eighth terminal, the fifth terminal and the fourth terminal so that the constant voltage of the constant voltage and the constant current (Or when the voltage of the battery reaches a certain level) so as to continuously supply the LED module 1 and allow the LED to be lit for a longer time, To light up the LED with low illumination. In addition, when an overvoltage or an overcurrent is applied to the LED module 1, the discharge transistor Q5 is turned off to protect it.

The transistor Q101 of FIG. 4 controls the output current through two terminals of the DC / DC converter.

Also, since the DC / DC converter unit 80 controls the output current of the LED module in a closed loop manner, the constant DC / DC conversion efficiency is maintained at 95% or more even when the power of the battery is fluctuated. .

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited thereto and that various changes and modifications may be made therein by those skilled in the art. Should be interpreted as belonging to the scope.

10: direct current part 20: first and second switching parts
30: No-load prevention part 40: Battery protection part
50: test section 60: constant voltage section
70: DOWN part 80: DC / DC converter part

Claims (4)

battery;
A direct current part for converting the input commercial power into direct current power to charge the battery;
A DC / DC converter unit for turning on an LED with a power source discharged from the battery;
A first switch for connecting the battery and the DC / DC converter when the input of the commercial power is interrupted; a second switch for connecting the DC / DC converter to the LED;
And a no-load preventing unit for preventing the DC / DC converter unit from becoming a no-load state before the second transferring unit is operated after the first transferring unit is operated. The method according to claim 1,
A separation sensing unit for sensing whether the battery is detached,
And a battery protection unit including an over-discharge detecting unit for detecting a voltage of the battery and opening the DC / DC converter unit to prevent over discharge when the discharge end voltage becomes a discharge end voltage. The method according to claim 1,
A test unit for forcibly operating the first transfer unit and the second transfer unit to test normal operation;
A constant voltage unit configured to supply a voltage output from the direct current unit to a constant voltage;
Further comprising a down unit for down-converting an output voltage of the constant voltage unit when the test unit is tested. 4. The method according to any one of claims 1 to 3,
The DC / DC converter unit
A boost coil L1 for boosting a power source discharged from the battery,
A step-up transistor (Q2) for switching and causing the step-up coil (L1) to be stepped up,
A discharge transistor (Q5) for controlling the discharge of the battery by turning on and off,
And a microcomputer (U101) for controlling the step-up transistor (Q2) and the discharge transistor (Q5).

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