KR20130136236A - Charging & discharging circuit for led emergency lamp with battery - Google Patents

Abstract

A green industry for reducing energy is recently important. The supply of an LED lamp for the high efficiency of lamps such as a traffic light and a light is rapidly spread. A household lamp such as a fluorescent light, an incandescent light, and a halogen light is also replaced by the LED lamp. If one or two of LED lamps to be replaced play a role as an emergency lamp, the LED lamps can help deal with a blackout occurrence environment caused by natural disasters such as tsunamis, earthquakes, etc. The present invention provides a method capable of enabling the LED lamp to play a role as the emergency lamp. When the LED emergency lamp according to the present invention is put into an existing electronic socket, the LED emergency lamp is usually used as a general LED lamp which is operated according to the on/off operation of a switch and, during a blackout, as an emergency lamp which supplies the electric energy which is charged in a chargeable battery installed in the LED lamp to a part of LEDs.

Description

Battery charging circuit and discharge circuit of built-in rechargeable LED emergency light {Charging & Discharging circuit for LED Emergency Lamp with Battery.}

The present invention relates to a charging / discharging circuit of an LED emergency light with a built-in rechargeable battery. The present invention relates to an electric energy stored in a rechargeable battery built into an LED lamp during a normal [non-interruptive] operation by making a DC power supply using an LED current such as an LED light that does not use SMPS. The battery charging circuit and the discharge circuit to allow the LED light to act as an emergency light by supplying some of the LED array the energy charged in the battery in the event of power failure.

Conventional emergency lights are made exclusively for emergency lights and are usually installed in corridors, doors, etc. of a building, and serve to help people in the building quickly exit the site in case of an emergency such as a fire. However, such emergency lamps were not installed in general homes, which made it difficult for rapid on-site escape and evacuation activities in the event of a power outage caused by natural disasters such as tsunamis and earthquakes. Therefore, in order to save energy in the past, incandescent lamps, fluorescent lamps, and other low-efficiency lamps are replaced with LED lamps, and the light-efficient LED lamps are usually used as on / off LED lamps by switches. LED lights that detect the power failure state and use the electric energy charged in the rechargeable battery mounted on the inside of the lamp to illuminate the lamp for a certain time have been required.

An object of the present invention is a built-in rechargeable battery for LEDs driven by a commercial AC power supply without using SMPS, the battery is charged with full of electrical energy in normal [non-interruption], and the energy in the emergency [interruption] LED To supply to

1. How to make DC power in LED lamp driven by AC power.

2. How to keep the battery full of electrical energy during normal [non-interruption].

3. How to supply energy charged to the battery to the LED in case of emergency

4. How to prevent over discharge so that the battery does not over discharge.

In providing.

According to the present invention, in an LED-driven emergency lamp (with a built-in rechargeable battery) of an AC driving method configured by connecting a plurality of LED elements in series or in parallel, a diode is first used to obtain a DC power required by a rechargeable battery. After making the DC power supply of voltage, use DC / DC converter again and the voltage required by the battery [eg; In case of 12V battery, after making about 15.2V _DC ], if the battery is full of electric energy with this power supply, stop charging, and when the battery voltage is lowered by about 1% due to natural discharge, Make sure the battery is fully charged at all times. In addition, when a power failure is detected by a power failure detection sensor that distinguishes a power supply interruption state by switching on and off and a power supply interruption state by a power failure, the fully charged battery electric energy is required for some LED arrays. Supply only to adjust the operation time of emergency light in case of power failure.

When the LED combined with the emergency light using the present invention is spread in each home, even in the event of a power outage caused by natural disasters, it will be a great help to allow people in the room to cope with the situation calmly. When the present invention is applied to the valve (bulb) type LED lamps, the existing lamps only need to be replaced with the lamps according to the present invention, so that ordinary lamps serve as emergency lights. It can be installed, and it also provides the effect of preventing large accidents in case of emergency.

1 is a circuit diagram and a block diagram showing an embodiment of the present invention.
Description of the Related Art
A: LED light
B: LED drive
C: LED Matrix Array
AC: Commercial AC Power
1: Bridge rectifier circuit block
2: switching control circuit block
3: driving power circuit block
31: DC / DC converter
4: Battery charging circuit block
41: constant current circuit block
5: power failure detection switch circuit block
51: power failure detection sensor
52: switch circuit block
53: over-discharge breaking circuit block
6: rechargeable battery
LDA1 to LDA8: First to Eighth LED Arrays
u ₁ , u ₂ : first and second comparators [Comparator]
Q1, Q2: First and second transistors
D1 to D8: first to eighth diodes
ZD1: Zener Diode
R ₁ to R ₁₁ : first to eleventh resistances
C _{1 to} C ₂ : First and second capacitors

The operation principle of the battery charge and discharge circuit of the present invention for achieving the above object will be described in detail with the drawings. In FIG. 1, since the pulse current obtained by bridge rectifying the input alternating electric signal is directly applied to the LED matrix array [C], it is connected in series to each LED array from the first LED array [LDA ₁ ] to the eighth LED array [LDA ₈ ]. If the number of LEDs is the same and the peak voltage of the bridge rectified pulse current is 311V _DC , the peak voltage applied to the anode terminal of the fifth diode [D ₅ ] is 311V _DC × ½ = 155.5V _DC . Therefore, about 155V _DC is applied to the input terminal of the DC / DC converter [31]. If the full charge voltage of the rechargeable battery [6] embedded in the LED lamp is 12V _DC , the output voltage of the DC / DC converter [31] should be about 15.2V _DC . If the upper limit of the charge current of the battery [6] is 200mA, the current of the current regulator [41] may be set to 0.2A. When the battery is not fully charged, the first comparator [u ₁ ] outputs Low to turn on the first transistor [Q ₁ ] so that the battery [6] is charged with a constant current of 0.2 A, and the battery Is charged, the first comparator [u ₁ ] outputs High, turns off the first transistor, and cuts off the charging current to the battery. The zener voltage of Zener diode [Z _D1 ] applied as the reference voltage of the first comparator u ₁ is 2.5V _DC and the full charge voltage of the battery is 12.0V _DC , and the resistance of R ₄ is r ₄ , R ₅ . If the resistance is r ₅ ,

r ₅ : (r ₄ + r ₅ ) = 2.5: 12.0

To hold true, that is, r ₄ = 3.8 r ₅

R ₄ and r ₅ can be determined to be. Once the Q1 is OFF, the R ₅ is the current and R _1, R _2, the voltage applied to the first (+) terminal of the comparator u ₁ so that the flowing current is superimposed through D ₇ passing through the R ₄ is there is a slight increase At this time, if the resistance values of R ₁ and R ₂ are set so that about 5% of the current flowing in R ₄ overlaps, the positive terminal voltage of the first comparator u ₁ increases by about 5%, and the battery voltage is at full charge voltage. When about 5% is discharged, the first comparator u ₁ outputs Low again and charging starts automatically. If the battery voltage is V _Batt

11.4 V _DC ≤ V _Batt ≤ 12 V _DC

The battery voltage is maintained to establish the relationship between. E.g

r ₅ = 2.5 kΩ

r ₄ = 3.8 kΩ, r ₅ = 9.5 kΩ

In this case, the current flowing through R ₅ is 1mA, so when Q ₁ is off, the current flowing through R ₁ and R ₂ becomes 0.05mA, and the voltage drop between R ₁ and R ₂ is (15.2-2.5-0.7) V _DC = be 12V _DC, so that the resistance value of the resistance of _{r 1 r 1, r 2 r} 2 r ₁ = 50KΩ and when it should be, so r ₁ + r ₂ = 240KΩ may be set to r ₂ = 190KΩ. The first comparator is not a seventh diode [D _7] reverse voltage is due to any other than the first comparator, the battery voltage (+) input terminal of the charge voltage monitors design u ₁ of u ₁ takes on also influence the time it outputs a Low Do not. In FIG. 1, when the blackout detection sensor 51 detects a power failure, the blackout detection sensor 51 outputs High to turn on Q ₃ and Q ₂ so that the electric energy charged in the battery 6 is 8th. It acts as an emergency light by supplying current to the eighth LED array [LDA ₈ ] through the resistor [R ₈ ] and the eighth diode [D ₈ ]. Here, the eighth diode [D ₈ ] is a diode for preventing reverse current to the _second transistor [Q ₂ ] during normal [non-interruption], and the eighth resistor [R ₈ ] is a resistor for limiting the LED current. In addition, the rechargeable battery requires a device that does not necessarily overdischarge because the charging function may not be restored even if overcharged again. (-) the second comparator in Figure 1 as 8.5V when the lower limit voltage of the reference voltage - 2.5V _DC] was added and the rechargeable batteries [6] to the terminal _DC, the second comparator when the battery voltage be 8.5V _DC [u ₂ If 2.5V _DC is applied to the (+) terminal of]

Is to be

Since the relationship of must be established, if the resistance r ₁₁ of R ₁₁ is set to 50KΩ, the resistance value of R ₁₀ r ₁₀ = 120KΩ. In this case, when the battery voltage falls below 8.5 V _DC , the second comparator [u ₂ ] outputs Low to turn off both the third transistor [Q ₃ ] and the second transistor [Q ₂ ]. ] By discharging the battery [6], the LED lamp is kept OFF, and thus overdischarge of the battery is prevented. In FIG. 1, the switching circuit block 2 switches and controls the LED arrays from the first LED array LDA1 to the eighth LED array LDA ₈ according to the phase of the input electrical signal. The sixth diode [D6] is for supplying a drive current to the switching control circuit block [2] during a power failure.

Claims (3)

A battery charging circuit circuit block [4] of an LED emergency light which is driven by connecting _n LED arrays [LDA _{1 to} LDA _n ] in series and having a built-in rechargeable battery is provided from the cathode terminal of at least one LED array of the n LED arrays. And using the output voltage of a DC / DC converter supplied with a DC power supply as a charging power source. The battery charging circuit block [4] includes a switching element [Q ₁ ], a comparator [u ₁ ], and a constant current circuit block [ 41], wherein the switching element is controlled by the output of the comparator to charge electrical energy in the rechargeable battery [6].
Battery charging circuit for LED emergency light. n LED arrays [LDA _{1 to} LDA _n ] are driven in series, and a power failure detection sensor [51] and a switching element [Q ₂ ] are connected to an electrostatic detection switch circuit block [5] such as an LED emergency lamp equipped with a rechargeable battery. A comparator [u ₂ ] and a reverse current prevention diode [D ₈ ], and the switching element [Q ₂ ] is turned on [ON] and off [OFF] by the output of the electrostatic detection sensor [51] Supplying electrical energy to at least one LED array of the n LED arrays, wherein the output of the comparator [u ₂ ] blocks over-discharge of the battery.
Battery discharge circuit of LED emergency light. The battery according to claim 1, wherein when the battery is fully charged, the battery charging power is superimposed on the battery voltage sensing terminal [u ₁ + terminal] through the diode [D ₇ ], and when the battery voltage is discharged below the holding voltage range, the switching element [ Q ₁ ] further by causing the battery voltage to maintain a constant range by turning on again
Battery charging circuit for LED emergency light.

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