JP2011150852A - Led lamp circuit with emergency light function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lamp circuit with an emergency light function that consumes low power in an emergency and is simply structured. <P>SOLUTION: The LED lamp circuit 10 is configured such that a plurality of LEDs 12 are connected in series, blocks 21, in which Zener diodes 13 with Zener voltage higher than the ON voltage of the LEDs 12 are connected in anti-parallel, are disposed to each of the LEDs 12, and is operated when forward bias is applied from a normal power source 14 to the LEDs 12 during normal operation. A plurality of blocks 21 are connected in parallel, and a diode 23 is connected such that it is in series only with some blocks 22 and a cathode side thereof is disposed on the normal power source 14 side in some blocks 22. A positive pole of an emergency power source 24 is connected between the normal power source 14 side of some blocks 22 and the cathode side of the diode 23. In an emergency when no voltage is supplied from the normal power source 14, forward bias is applied to the LEDs 12 of some blocks 22 and only some blocks 22 are lit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an LED lamp circuit with an emergency light function that is used as normal lighting and functions as an emergency light in an emergency such as a power failure.

In recent years, LED lamps 11 in which a plurality of LEDs 12 such as a bullet-type LED (a) and a surface-mounted LED (b) as shown in FIG. As shown in FIG. 6, the appearance of the LED lamp 11 is substantially the same as that of a fluorescent lamp.
The LED lamp 11 has the advantage that it consumes less power and has a longer product life compared to a fluorescent lamp, so that each company has been researching and developing and commercializing it, and the present applicant has already filed a patent application for the LED lamp 11. (Patent Document 1).

JP 2009-16493 A

  The LED lamp 11 according to the invention described in Patent Document 1 includes a circuit 10 as shown in FIG. The circuit 10 includes a plurality of LEDs 12 connected in series, and each of the LEDs 12 is connected in parallel with a Zener diode 13 having a Zener voltage higher than the on-voltage of the LED 12 with the anode side being the cathode side of the LED 12. Thus, a power source (normal AC power source) 14 is connected to this via a diode stack 15, a capacitor C, and a constant current diode 16. An alternating current from the power source 14 is converted into a direct current by the diode stack 15 and further a direct current controlled by the constant current diode 16 is passed through a circuit in which a plurality of LEDs 12 and a Zener diode 13 are connected in parallel. This causes the LED 12 to emit light.

  In such an LED lamp 11, even if a trouble such as disconnection occurs in one of the LEDs 12, a current flows through the Zener diode 13 connected in parallel to the disconnected LED 12. Current continues to flow, and the remaining LEDs 12 continue to light. Therefore, the LED lamp 11 can be used without replacing the disconnected LED 12 with a new one immediately after the disconnection of the LED 12, so that it is convenient without replacing the LED 12.

However, since the LED lamp 11 has not taken measures when the power supply 14 does not operate due to a power failure or the like, the LED lamp 11 is turned off at the time of a power failure.
Here, in order to light the LED lamp 11 in such an emergency, it is conceivable to connect an emergency power supply (usually a rechargeable battery) to the LED lamp 11. This emergency power supply is connected to the normal power supply 14. Similarly, simply connecting to the LED lamp 11 consumes the same amount of power as in normal times even in an emergency. In an emergency, the LED lamp 11 must be lit for a certain period of time with an emergency power source that is a rechargeable battery. Therefore, even when the LED lamp 11 consumes less power than a fluorescent lamp, the power consumption during emergency is reduced. It is necessary to further suppress.

  However, if the LED lamp 11 is structured to reduce the illuminance of each LED 12 when a power failure occurs, there is a problem that the circuit of the LED lamp 11 becomes complicated.

  Therefore, an object of the present invention is to provide an LED lamp circuit with an emergency light function that consumes less power in an emergency and has a simple structure.

  In order to achieve the above object, an LED lamp circuit with an emergency light function (20) according to claim 1 of the present invention comprises a plurality of LEDs (12) connected in series to each individual LED (12). Then, a block (21) is arranged in which a Zener diode (13) having a Zener voltage higher than the on-voltage of the LED (12) is connected in parallel with the anode side being the cathode side of the LED (12). In the LED lamp circuit that is normally operated by applying a forward bias from the normal power source (14) to the LED (12), a plurality of the blocks (21) are connected in parallel, and only a part of the blocks (22) are connected in series. And a diode (23) is connected so that the cathode side is arranged on the normal power supply (14) side in the partial block (22), and the partial block 22) of the emergency power supply (24) is connected between the normal power supply (14) side of the diode (23) and the cathode side of the diode (23), and in case of an emergency in which no voltage is supplied from the normal power supply (14), Only some of the blocks (22) are lit by applying forward bias to the LEDs (12) of some of the blocks (22).

  The LED lamp circuit (20) with an emergency light function according to claim 2, wherein the normal power source (14) is an AC power source, and the AC current is converted into a DC current by the first diode stack (15). It is characterized by being.

  In the LED lamp circuit (20) with an emergency light function according to claim 3, the emergency power source (24) is an AC power source, and the AC current is converted into a DC current by the second diode stack (25). It is characterized by being.

  The LED lamp circuit (20) with an emergency light function according to claim 4 has a constant current for controlling the current flowing through the block (21) to be constant regardless of the voltage in each of the plurality of blocks (21). A diode (16) is connected in series.

  The LED lamp circuit (20) with an emergency light function according to claim 5 is characterized in that the partial block (22) is a single block.

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

According to the LED lamp circuit with an emergency light function according to claim 1 of the present invention, a plurality of blocks are connected in parallel, and only in some blocks are connected in series, and the cathode side is connected to the normal power supply side in some blocks. Since the diodes are connected so that they are arranged, and the positive pole of the emergency power supply is connected between the normal power supply side of some blocks and the cathode side of the diode, in the event of an emergency when no voltage is supplied from the normal power supply, A forward bias is applied to the LED of the block from the emergency power supply, and a reverse bias is applied to the diode, so that only a part of the block is lit. Therefore, the power consumption of the LED lamp circuit with an emergency light function in an emergency is smaller than that in a normal time.
Moreover, the structure of the LED lamp circuit with an emergency light function is simple because only a diode and an emergency power supply are added to a circuit in which a plurality of blocks each composed of a plurality of LEDs and Zener diodes are connected in parallel.
Each block has a plurality of LEDs connected in series, and a Zener diode having a Zener voltage higher than the on-voltage of the LED is connected in parallel to each individual LED with the anode side being the cathode side of the LED. Therefore, even if the LEDs in some blocks that are lit in an emergency break, current flows through the Zener diode connected in parallel with the broken LEDs, and the remaining LEDs in some blocks Continue to light up.

  According to the LED lamp circuit with an emergency light function according to claim 2, in addition to the operation and effect of the invention according to claim 1, the normal power source is an AC power source, and the AC current is the first diode stack. Therefore, it is possible to use an AC power source used in a general home, office, factory or the like as a power source.

  According to the LED lamp circuit with an emergency light function described in claim 3, in addition to the operation effect of the invention described in claim 1 or 2, the emergency power supply is an AC power supply, and the AC current is the second Since it is converted into a direct current by the diode stack, it is not necessary to confirm the sign of the emergency power supply when connecting, as in the case where the emergency power supply is a DC power supply, and the emergency power supply connection work is easy.

  According to the LED lamp circuit with an emergency light function described in claim 4, in addition to the operational effects of the invention described in claims 1 to 3, a constant current diode is connected in series to each of the plurality of blocks. Therefore, even if one of the LEDs is disconnected and the voltage applied to the constant current diode connected in series with the LED drops, the current flowing to the block including the disconnected LED is controlled to be constant regardless of the voltage, Stable illuminance can be secured continuously.

  Further, according to the LED lamp circuit with an emergency light function described in claim 5, in addition to the operational effects of the invention described in claims 1 to 4, a part of the blocks that are lit in an emergency is a single block. The power consumption in an emergency can be further suppressed.

  As in the LED lamp circuit with an emergency light function of the present invention, a plurality of blocks are connected in parallel, and only in some blocks are connected in series, and the cathode side is arranged on the normal power supply side in the some blocks. In the case of an emergency in which no voltage is supplied from the normal power source, the positive electrode of the emergency power source is connected between the normal power source side of the partial block and the cathode side of the diode. The point that only a part of the blocks is lit by applying forward bias to the LEDs is not described in Patent Document 1 described above.

It is a circuit block diagram which shows the LED lamp circuit with an emergency light function which concerns on embodiment of this invention. It is a wiring diagram of a LED lamp structure provided with the LED lamp circuit with an emergency light function shown in FIG. It is a circuit block diagram which shows the principal part of the LED lamp circuit with an emergency light function which concerns on other embodiment of this invention. It is a side view which shows a LED chip. It is a side view which shows LED, (a) shows a bullet-type LED, (b) shows a surface mount type LED. It is an external view which shows an LED lamp, (a) shows a top view, (b) shows a side view. It is a circuit block diagram which shows the LED lamp circuit which concerns on a prior art example.

An LED lamp circuit 20 with an emergency light function according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, 5, and 6.
The LED lamp circuit 20 with an emergency light function mainly includes an LED 12, a Zener diode 13, a constant current diode 16, a diode 23, a normal power supply 14, and an emergency power supply 24.

The LED 12 is a bullet-type LED as shown in FIG. 5A, and is energized and emits light when a positive voltage is applied to the anode side. A plurality of such LEDs 12 are connected in series.
The Zener diode 13 is an element that allows a current to flow in the forward direction like the normal diode 23 and also to flow in the reverse direction if the reverse voltage is larger than the Zener voltage. Here, the Zener diode 13 whose Zener voltage is higher than the ON voltage of the LED 12 is selected.
As shown in FIG. 1, the Zener diodes 13 are arranged so that the anode side of the Zener diode 13 is the cathode side of the LED 12 with respect to each LED 12, and the LED 12 and the Zener diode 13 are arranged in parallel. Blocks 21 connected in a so-called reverse parallel manner are formed, and a plurality of blocks 21 configured in this way are connected in parallel.

  The constant current diode 16 controls the flowing current to be constant regardless of the voltage, and is disposed on the normal power supply 14 side (upstream side of the current) of each of the plurality of blocks 21 and is connected to each block 21 in series. It is connected. In the present embodiment, the constant current diode 16 limits the current flowing through each block 21 to 15 mA.

  The diode 23 is connected in series only to one block 22 (hereinafter referred to as an emergency lighting block) of the plurality of blocks 21, and the cathode side of the diode 23 is connected in series to the emergency lighting block 22. The diode 16 is connected so as to be disposed on the normal power supply 14 side (anode side). That is, the anode side of the diode 23 is connected to the anode side of each constant current diode 16 connected in series to the block 21 other than the emergency lighting block 22.

The normal power source 14 is a 100V commercial AC power source. The alternating current is converted into a direct current by the first diode stack 15 connected to the output side of the normal power supply 14, and the direct current voltage smoothed by the capacitor C is applied to the block 21 connected in parallel. . At this time, the positive electrode of the normal power supply 14 is connected to the anode side of the LED 12 so that the LEDs 12 in all the blocks 21 including the emergency lighting block 22 are forward-biased from the normal power supply 14.
The diode stack 15 is also called a diode bridge or a bridge stack.

As shown in FIG. 2, the emergency power source 24 includes a rechargeable battery 26 that is a DC power source and a control unit 27 that converts the 6V DC voltage into a 130V AC voltage. The alternating current of the emergency power supply 24 is converted again into a direct current by the second diode stack 25. The positive pole of the emergency power supply 24 is connected between the anode side of the constant current diode 16 connected in series with the emergency lighting block 22 and the cathode side of the diode 23, and the negative pole of the emergency power supply 24 is Connected to the cathode side of the LED 12 of the lighting block 22, a forward bias is applied from the emergency power supply 24 to the LED 12 of the emergency lighting block 22.
The emergency power supply 24 is also connected to the normal power supply 14 and has a circuit (not shown) for determining whether or not there is a power failure (on / off of the normal power supply 14) so that the emergency power supply 24 operates in the event of a power failure. It has become.

Of the LED lamp circuit 20 with an emergency light function described above, the components other than the normal power supply 14 and the emergency power supply 24 are arranged in an LED lamp 31 with an emergency light function, as shown in FIG.
As shown in FIG. 6, the appearance of the LED lamp 31 with an emergency light function is almost the same as that of a normal fluorescent lamp. Two LEDs are provided at both ends of the LED lamp 31, and the power from the power sources 14 and 24 is supplied to the LED 12. Supply electrodes 31a and 31b are provided.
The positive electrode and the negative electrode of the normal power supply 14 are connected to the two electrodes 31a provided on one end side of the LED lamp 31, and the emergency power supply 24 is connected to the two electrodes 31b provided on the other end side. The positive electrode and the negative electrode are connected.

  A switch S1 is provided between the LED lamp 31 with an emergency light function and the normal power supply 14 so that the user can turn on and off the LED lamp 31 with an emergency light function in a normal state. In order to confirm the operation of the emergency power supply 24, the circuit is forcibly cut off between the normal power supply 14 and the LED lamp 31 with an emergency light function, and between the normal power supply 14 and the emergency power supply 24. A test switch S2 for creating a state is provided.

The thus configured LED lamp circuit 20 with an emergency light function operates as follows.
In normal times, the LEDs 12 in all the blocks 21 including the emergency lighting block 22 are forward-biased from the normal power source 14, and the LEDs 12 emit light. Although the emergency power supply 24 does not operate normally, the voltage of the normal power supply 14 is forward-biased with respect to the diode 23. Therefore, the current also flows through the emergency lighting block 22 connected to the downstream side of the diode 23. The LED 12 of the block 22 also emits light during normal times. At this time, the illuminance of the entire LED lamp 31 with an emergency light function is 200 to 300 lux, and the LED lamp 31 with an emergency light function is used as normal illumination in the same manner as a fluorescent lamp.

Here, in the event of an emergency in which no voltage is supplied from the normal power source 14 such as a power failure, the emergency power source 24 is activated when the emergency power source 24 detects the power failure. Since the voltage of the emergency power supply 24 is reversely biased with respect to the diode 23, no current flows through the blocks 21 other than the emergency lighting block 22.
On the other hand, since the emergency lighting block 22 is not affected by the diode 23, the LED 12 of the emergency lighting block 22 is forward biased from the emergency power supply 24, and only the LED 12 of the emergency lighting block 22 is lit.
As a result, in an emergency, only one end of the LED lamp 31 on which the emergency lighting block 22 is arranged emits light, and the portion of the emergency lighting block 22 functions as an emergency light. At this time, the same amount of current (15 mA) flows through the emergency lighting block 22 as normal, and the LEDs 12 of the emergency lighting block 22 emit light with normal brightness, but the illuminance of the entire LED lamp 31 is 2 lux. It will be about.

According to the LED lamp circuit 20 with an emergency light function configured as described above, a plurality of blocks 21 are connected in parallel, and only one emergency lighting block 22 of the plurality of blocks 21 is connected in series and its cathode. The diode 23 is connected so that the side is disposed on the normal power supply 14 side in the emergency lighting block 22, and the positive electrode of the emergency power supply 24 is connected between the normal power supply 14 side of the emergency lighting block 22 and the cathode side of the diode 23. Therefore, in an emergency in which no voltage is supplied from the normal power source 14, the LED 12 of the emergency lighting block 22 is forward-biased from the emergency power source 24 and the diode 23 is reverse-biased so that only the emergency lighting block 22 is present. Light.
Therefore, the power consumption of the LED lamp circuit 20 with an emergency light function in an emergency is smaller than that in a normal time. In the present embodiment, the power consumption in an emergency is approximately 1/100 compared to the normal time.

In addition, since the circuit 20 is obtained by adding a diode 23 and an emergency power supply 24 to a circuit in which a plurality of blocks 21 each composed of an LED 12 and a Zener diode 13 are connected in parallel, the structure of the LED lamp circuit 20 with an emergency light function is as follows. It is simple.
Each block 21 connects a plurality of LEDs 12 in series, and in parallel with each LED 12, a Zener diode 13 having a Zener voltage higher than the on-voltage of the LED 12 is set in parallel with the anode side being the cathode side of the LED 12. Since it is connected, even if the LED 12 in the emergency lighting block 22 that is lit in an emergency is disconnected, a current flows through the Zener diode 13 connected in parallel with the disconnected LED 12, and the emergency lighting block 22. The remaining LEDs 12 continue to be lit. This is because, when a power failure occurs due to a fire, the LED 12 may be disconnected due to the heat. However, even if a power failure occurs due to a fire, it is easy to keep the emergency light on. Of course, it may be disconnected due to causes other than fire, and it is possible to cope with it, and even if any of the LEDs 12 of all the blocks 21 including the emergency lighting block 22 is disconnected in normal time, The block 21 having the LED 12 continues to be lit.

  In addition, the normal power source 14 is an AC power source, and the AC current is converted into a DC current by the first diode stack 15. Therefore, an AC power source used in a general home, office, factory, or the like is used as a power source. can do. In particular, in the LED lamp circuit 20 with the emergency light function, the constituent elements except the normal power supply 14 and the emergency power supply 24 are arranged in the LED lamp 31 with the emergency light function, so that they are provided in many ordinary homes. The LED lamp 31 can be used only by accommodating the LED lamp 31 with an emergency light function instead of the fluorescent lamp in a fluorescent lamp apparatus that accommodates the fluorescent lamp and supplies an AC voltage to the fluorescent lamp. Therefore, construction for introducing the LED lamp 31 with the emergency light function is not required, and the user can easily replace the fluorescent lamp with the LED lamp 31 with the emergency light function.

  Further, the emergency power source 24 is an AC power source, and the AC current is converted into a DC current by the second diode stack 25. Therefore, as in the case where the emergency power source 24 is a DC power source, the emergency power source 24 is connected at the time of connection. There is no need to confirm the sign, and the connection work of the emergency power supply 24 is easy. In addition, the installation work is terminated without noticing that the installation contractor connects the positive and negative of the emergency power supply 24 in reverse, and the LED lamp 31 with the emergency light function does not operate in an emergency.

  In addition, since the constant current diode 16 is connected in series to each of the plurality of blocks 21, one of the LEDs 12 is disconnected and the voltage applied to the constant current diode 16 connected in series with the LED 12 is reduced. However, the current flowing through the block 21 including the disconnected LED 12 is controlled to be constant regardless of the voltage, and a stable illuminance can be continuously secured.

  In the present embodiment, the emergency lighting block 22 is one block among the plurality of blocks 21, but by connecting a diode 23 in series with the two blocks 21 as shown in FIG. The two blocks 21 may be the emergency lighting blocks 22 or a larger number of blocks 21. However, since it is sufficient to obtain legal illuminance as an emergency light, it is not necessary to use many blocks 21 as emergency lighting blocks 22 from the viewpoint of power saving.

  Further, although the AC power supply is the normal power supply 14, the present invention is not limited to this, and a DC power supply may be used without providing the first diode stack 15. Similarly, the rechargeable battery 26 which is a DC power supply without providing the second diode stack may be used as the emergency power supply 24 as it is. Thus, when a DC power supply is used, it is necessary to accurately connect the positive and negative of the DC power supply.

Further, although the constant current diode 16 is connected in series to the normal power supply 14 side of each block 21, the present invention is not limited to this, and the constant current diode 16 is connected to the cathode side of an arbitrary LED 12 of the block 21 composed of a plurality of LEDs 12. There may be.
Furthermore, even if the constant current diode 16 is not provided, the LED lamp circuit 20 with an emergency light function functions. In this case, only the constant current diode 16 is removed from the LED lamp circuit 20 with an emergency light function shown in FIG. That is, the cathode side of the diode 23 is connected to the normal power supply 14 side in the emergency lighting block 22, and the positive electrode of the emergency power supply 24 is connected between the diode 23 and the emergency lighting block 22.

Moreover, although LED12 used for the LED lamp 31 with an emergency light function was used as a bullet-type LED, it may be a surface mount type LED as shown in FIG.5 (b). Moreover, you may arrange | position LED chip 28 which is a semiconductor element itself in the inside of a cannonball type LED and surface mount type LED as shown in FIG. 4 in the LED lamp 31 with an emergency light function.
Moreover, although the LED lamp 31 with an emergency light function is a fluorescent lamp type, it is not limited to this.

10 LED lamp circuit 11 LED lamp 12 LED
13 Zener diode 14 Power supply (normal power supply)
15 Diode stack (first diode stack)
16 Constant current diode 20 LED lamp circuit with emergency light function 21 Block 22 Some blocks (Emergency lighting block)
23 Diode 24 Emergency power supply 25 Diode stack (second diode stack)
26 Rechargeable Battery 27 Control Unit 28 LED Chip 31 LED Lamp with Emergency Light Function 31a Electrode 31b Electrode C Capacitor S1 Switch S2 Test Switch

Claims (5)

A block in which a plurality of LEDs are connected in series and a Zener diode having a Zener voltage higher than the on-voltage of the LED is connected in parallel with the anode side of the LED being the cathode side of the LED. In an LED lamp circuit that is arranged and is normally operated by forward biasing the LED from a normal power source,
While connecting a plurality of the blocks in parallel,
A diode is connected so that only in some blocks are in series and the cathode side is arranged on the normal power supply side in the some blocks,
A positive bias of an emergency power supply is connected between the normal power supply side of the partial block and the cathode side of the diode, and in the event of an emergency when no voltage is supplied from the normal power supply, forward bias is applied to the LEDs of the partial block. An LED lamp circuit with an emergency light function, wherein only the part of the blocks is turned on.   The LED lamp circuit with an emergency light function according to claim 1, wherein the normal power source is an AC power source, and the AC current is converted into a DC current by a first diode stack.   3. The LED lamp circuit with an emergency light function according to claim 1, wherein the emergency power source is an AC power source, and the AC current is converted into a DC current by a second diode stack.   4. The constant current diode for controlling the current flowing through the block to be constant regardless of the voltage is connected in series to each of the plurality of blocks. 5. LED lamp circuit with emergency light function.   The LED lamp circuit with an emergency light function according to any one of claims 1 to 4, wherein the partial block is a single block.

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