JP2015056998A - LED lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of preventing voltage of a storage battery from being dropped when power supply is changed to the power supply from the storage battery during interruption of power supply.SOLUTION: An LED lighting comprises a plurality of LED elements and a lightning number control part. When power supply from an electric power system is cut off and the power supply is changed to the power supply from a storage battery, the lightning number control part controls the lightning number of the LED elements so as to reduce the lightning number of the LEDs elements.

Description

  The present technology relates to an LED illumination having a plurality of LED elements.

  In recent years, it has become common for homes and office buildings to be provided with power generation systems that use solar power or wind power, and storage batteries that store power supplied from power systems such as power companies (for example, , Patent Document 1, paragraph [0002]).

  When a failure such as a power failure does not occur, power is supplied to loads such as lighting, a television, and a refrigerator by the system power supplied from the power system of an electric power company or the like. Alternatively, in this case, power is supplied to a load such as lighting by both power supply from the power system and power supply from the power generation system.

  On the other hand, when a power failure occurs and power supply from the power system is interrupted, power is supplied to a load such as lighting by the power supply from the storage battery.

  In recent years, LED lighting having a plurality of LED elements (LEDs: Light Emitting Diodes) has been widely used as lighting instead of fluorescent lamps, incandescent lamps, and the like. It is known that the current supplied to the LED illumination needs to be stabilized in order to cause the LED illumination to emit light stably (see, for example, Patent Document 2, paragraph [0002] below).

  In addition, the following patent document 3 is mentioned as a technique relevant to this application.

JP 2013-176282 A JP 2008-310963 A JP 2011-190090 gazette

  At the moment when the power supply from the power system is cut off and switched to the power supply from the storage battery, a large current flows from the storage battery, which may cause a phenomenon in which the voltage of the storage battery decreases. is there. When the voltage of the storage battery decreases, there is a problem that the entire system goes down.

  In view of the circumstances as described above, an object of the present technology is to provide a technology capable of preventing the voltage of the storage battery from dropping when the power supply is switched to the power supply from the storage battery at the time of a power failure. It is in.

The LED illumination according to the present technology includes a plurality of LED elements and a lighting number control unit.
The lighting number control unit controls the number of lighting of the LED elements so as to reduce the number of lighting of the LED elements when the power supply from the power system is cut off and the power supply is switched to the power supply from the storage battery. To do.

  According to this LED illumination, when the power supply is switched to the power supply from the storage battery at the time of a power failure, the number of lighting of the LED elements can be automatically reduced. Thereby, the electric current which flows into LED illumination when electric power supply is switched to the electric power supply from a storage battery can be suppressed. Thereby, it can prevent that the voltage of a storage battery falls abnormally.

  In the LED illumination, when the power supply from the power system is insufficient, the lighting number control unit may control the lighting number of the LED elements so as to reduce the lighting number of the LED elements.

  In this LED lighting, since the number of lighting of the LED elements is reduced when the power supply from the power system is insufficient, the power consumption of the LED lighting is automatically reduced when the power supply from the power system is insufficient. Can be suppressed. In this way, the risk of planned power outage is reduced by making up for the shortage of power supply.

  In the LED illumination, the lighting number control unit monitors a change in the voltage supplied from the power system in time series, and the number of lighting of the LED element is changed according to the change in the voltage supplied from the power system. The number of lighting of the LED elements may be controlled so as to reduce the above.

  Here, the supply voltage of the electric power system (electric power company) is regulated by law (low-voltage legal voltage: 101V ± 6V), but when the power becomes insufficient, the supply voltage decreases, and 95V (= 101V− 6V) gradually approaching. On the other hand, in this LED lighting, when the supply voltage by the power system decreases due to power shortage, the LED lighting lighting number control unit automatically detects a decrease in the supply voltage, and the LED element lighting number automatically changes. Reduced.

  In the LED lighting, the lighting number control unit is transmitted from a control unit that receives information indicating insufficient power from the power system and transmits instruction information for reducing the number of lighting of the LED elements according to the information. The instruction information may be received, and the number of lighting of the LED elements may be controlled so as to reduce the number of lighting of the LED elements according to the instruction information.

  As a result, the power system (electric power company) reduces the number of lighting of LED elements in the LED lighting provided in a house or office building by transmitting information on power shortage when power is insufficient. Can do. That is, in this LED illumination, the number of lighting of LED elements can be positively adjusted by an electric power system (electric power company).

  In the LED illumination, the lighting number control unit monitors a change in voltage supplied from the storage battery in time series after the power supply is switched to the power supply from the storage battery, and is supplied from the storage battery. The number of lighting of the LED element may be controlled so as to reduce the number of lighting of the LED element according to the change of the voltage.

  Thereby, when the voltage supplied from a storage battery falls, the number of lighting of an LED element can be reduced. Thereby, although the brightness as the whole LED lighting reduces, LED lighting can be lighted for a long time.

The LED illumination may further include a plurality of relay circuits that have a switch and can be held by themselves.
In this case, the plurality of LED elements may be divided into a plurality of blocks by being connected to any one of the plurality of relay circuits.
In this case, the lighting number control unit may control the number of lighting of the LED element so as to reduce the number of lighting of the LED element for each block by controlling the switch.

  By using such a self-holding relay circuit, it is possible to prevent unnecessary power from being consumed due to the LED element being turned off.

The LED illumination according to another aspect of the present technology includes a plurality of LED elements and a lighting number control unit.
The lighting number control unit controls the lighting number of the LED elements so as to reduce the lighting number of the LED elements when power supply from the power system is insufficient.

  In this LED lighting, since the number of lighting of the LED elements is reduced when the power supply from the power system is insufficient, the power consumption of the LED lighting is automatically reduced when the power supply from the power system is insufficient. Can be suppressed. In this way, the risk of planned power outage is reduced by making up for the shortage of power supply.

  As described above, according to the present technology, it is possible to provide LED lighting that can prevent the voltage of the storage battery from dropping when the power supply is switched to the power supply from the storage battery at the time of a power failure. it can.

It is a figure which shows the electric power feeding system which supplies electric power with respect to LED lighting which concerns on 1st Embodiment of this technique, and LED lighting. It is a figure showing LED lighting concerning this art. It is a partial enlarged view of LED illumination. It is a figure for demonstrating the principle of operation of a relay circuit. It is a figure which shows a mode when the lighting number of an LED element is controlled by the lighting number control part which concerns on 2nd Embodiment of this technique. It is a figure showing a 3rd embodiment of this art. It is a figure which shows an example of the discharge rate characteristic of a lithium ion secondary battery (storage battery). It is a figure showing LED lighting concerning a 5th embodiment of this art.

  Hereinafter, embodiments of the present technology will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating an LED illumination 10 according to the first embodiment of the present technology and a power supply system 20 that supplies electric power to the LED illumination 10.

  As shown in FIG. 1, the power supply system 20 includes a commercial power supply 11 (power supplied from system power such as an electric power company. Also referred to as system power), a disconnect switch 21, a bidirectional AC / DC converter 22, and the like. , DC / DC converter 23, charge / discharge controller 24, storage battery 25, and power generation unit 26. The LED lighting 10 and the power supply system 20 according to the present embodiment are installed in, for example, a house or an office building.

  The power feeding system 20 can supply power to the LED lighting 10 by a grid operation method and a self-sustaining operation method. In the interconnected operation method, power is supplied to the LED lighting 10 as a load by two powers, that is, power from the commercial power supply 11 and power generated by the power generation unit 26. In the interconnected operation method, when surplus power is supplied to the LED lighting 10, power is sold to an electric power company (electric power system).

  In the self-sustained operation method, power supply from the commercial power supply 11 is interrupted, and power is supplied to the LED lighting 10 by the power stored in the storage battery 25. At the time of a power failure, power is supplied to the LED lighting 10 by this self-sustaining operation method.

  The disconnect switch 21 is disposed between the commercial power supply 11 and the bidirectional AC / DC converter 22. The disconnect switch 21 is turned on when the power feeding system 20 is operating in the interconnection operation method. On the other hand, the disconnect switch 21 is turned off when operating in the self-sustained operation mode, whereby the storage battery 25 and the power generation unit 26 are disconnected from the commercial power source 11. In addition, when the system power is not supplied from the commercial power supply 11 at the time of a power failure, the disconnect switch 21 is automatically switched from the ON state to the OFF state.

  The bidirectional AC / DC converter 22 converts an AC voltage input from the commercial power supply 11 side into a DC voltage and outputs it. Further, the bidirectional AC / DC converter 22 converts a DC voltage input from the power generation unit 26 side through the charge / discharge controller 24 into an AC voltage and outputs the AC voltage to the commercial power supply 11 side. In this embodiment, it is possible to buy grid power from an electric power company via the bidirectional AC / DC converter 22, and it is also possible to sell surplus power to an electric power company or the like via the bidirectional AC / DC. It is possible.

  The storage battery 25 can store the electric power supplied from the commercial power supply 11 (for example, during the night). The storage battery 25 can also store the electric power generated by the power generation unit 26. The storage battery 25 is composed of, for example, a lithium ion secondary battery, a nickel hydride battery, a lead storage battery, or the like.

  The power generation unit 26 is, for example, a solar power generation device that generates electric power according to the amount of received light by receiving sunlight with a solar panel, a wind power generation device that generates power by rotating the generator by wind power, is there.

  The charge / discharge controller 24 can charge the storage battery 25 with power supplied from the commercial power supply 11 and converted into direct current by the bidirectional AC / DC converter 22. Further, the charge / discharge controller 24 can charge the storage battery 25 with the electric power generated by the power generation unit 26. Furthermore, the charge / discharge controller 24 can discharge the electric power charged in the storage battery 25.

  The DC / DC converter 23 lowers the voltage supplied from the commercial power supply 11 and converted into direct current by the bidirectional AC / DC converter 22 and the voltage from the storage battery 25 and the power generation unit 26 to a predetermined voltage. Applied to the illumination 10.

  FIG. 2 is a diagram illustrating the LED illumination 10 according to the present technology. FIG. 3 is a partially enlarged view of the LED illumination 10. As shown in these drawings, the LED illumination 10 includes a plurality of LED elements 1, a lighting number control unit 2, and a plurality of relay circuits 3 that can be self-maintained.

  In the example illustrated in FIG. 2, the total number of LED elements 1 is eight, but the number of LED elements 1 may be, for example, 50 or 100. The number of LED elements 1 is not particularly limited as long as it is 2 or more.

  In the example shown in FIG. 2, the total number of relay circuits 3 is 4. However, the number of relay circuits 3 is 2 or more, and particularly if the number is equal to or less than the number of LED elements 1. There is no limit.

  The LED element 1 is divided into a plurality of blocks by being connected to any one of the plurality of relay circuits 3. In the example shown in the figure, an example is shown in which a total of eight LED elements 1 are divided into four blocks, two of each. Note that the number of LED elements 1 included in one block may be one, and the number is not particularly limited. Further, the number of LED elements 1 included in a specific block may be different from the number of LED elements 1 included in another block.

  As shown in FIG. 3, the relay circuit 3 includes a switch 31, a reset switch 32, an exciting coil 33, a first fixed contact 41, a second fixed contact 42, a first movable contact 43, A third fixed contact 44, a fourth fixed contact 45, and a second movable contact 46 are included. Among these, the exciting coil 33, the first fixed contact 41, the second fixed contact 42, the first movable contact 43, the third fixed contact 44, the fourth fixed contact 45, and the first A relay is constituted by the two movable contacts 46 (see the one-dot chain line).

  The switch 31 is a normally closed type B contact switch, which is in an open state (OFF state) when an open signal of the lighting number control unit 2 is output, and in a closed state in other cases. (ON state) Of the two contacts of the switch 31, one contact is connected to the positive line 51 via the wiring 53, and the other contact is connected to one end side of the exciting coil 33.

  The reset switch 32 is a normally open type A contact switch 31. The reset switch 32 can be operated manually, and is closed (ON state) when operated manually, and is open (OFF state) in other cases. Of the two contacts of the reset switch 32, one contact is connected to the negative electrode line 52 via the wiring 54, and the other contact is connected to the other end side of the excitation coil 33.

  The first movable contact 43 contacts the first fixed contact 41 when a current flows through the excitation coil 33 and a magnetic field is formed by the excitation coil 33. On the other hand, when no current flows through the excitation coil 33 and no magnetic field is formed by the excitation coil 33, the first movable contact 43 comes into contact with the second fixed contact 42. A wiring 55 extending from the first fixed contact 41 is connected to the other end side of the exciting coil 33. Further, the wiring 56 extending from the first movable contact is connected to the wiring 54 connected to the negative electrode line 52.

  Similarly, the second movable contact 46 contacts the third fixed contact 44 when a current flows through the excitation coil 33 and a magnetic field is formed by the excitation coil 33. On the other hand, when no current flows through the excitation coil 33 and no magnetic field is formed by the excitation coil 33, the second movable contact 46 comes into contact with the fourth fixed contact 45. The third fixed contact 44 is connected to the positive electrode line 51 via the wiring 57.

  The second movable contact 46 is connected to the positive electrode side of the LED element 1, and the negative electrode side of the LED element 1 is connected to the negative electrode line 52.

  The operation principle of the relay circuit 3 will be described. FIG. 4 is a diagram for explaining the operating principle of the relay circuit 3. The upper drawing of FIG. 4 shows a state where the LED element 1 is turned off, and the lower drawing of FIG. 4 shows a state where the LED element 1 is turned on.

  In the description of the operation principle of the relay circuit 3, for the sake of convenience, the description will be given starting from the state in which the LED element 1 is turned off. Referring to the upper drawing of FIG. 4, the normally closed type switch 31 is in a closed state (ON state), and the normally open type reset switch 32 is in an open state (OFF state). In the state shown in the upper diagram of FIG. 4, since no current flows through the excitation coil 33, no magnetic field is generated by the excitation coil 33. For this reason, the first movable contact 43 is in contact with the second fixed contact 42, and the second movable contact 46 is in contact with the fourth fixed contact 45. Since the second movable contact 46 is in contact with the fourth fixed contact 45, no current flows through the LED element 1, and therefore the LED element 1 is turned off.

  When the reset switch 32 is manually operated and is temporarily closed (ON), a closed circuit is temporarily formed by the wiring 53, the switch 31, the exciting coil 33, the reset switch 32, and the wiring 54. The By forming this closed circuit, a magnetic field is generated by the exciting coil 33. When a magnetic field is generated by the excitation coil 33, the first movable contact 43 moves and contacts the first fixed contact 41, and the second movable contact 46 contacts the third fixed contact 44 (FIG. 4). Lower drawing).

  When the operation state of the reset switch 32 is released, the reset switch 32 returns to the open state (OFF state). In this case, the closed circuit by the wiring 53, the switch 31, the exciting coil 33, the reset switch 32, and the wiring 54 is no longer formed. However, when the first movable contact 43 is connected to the first fixed contact 41, a closed circuit is formed by the wiring 53, the switch 31, the excitation coil 33, the wiring 55, the first movable contact 43, the wiring 56, and the wiring 54. Is formed.

  For this reason, even if the operation state of the reset switch 32 is released, the current continues to flow through the exciting coil 33. Accordingly, the first movable contact 43 continues to contact the first fixed contact 41, and the second movable contact 46 continues to contact the third fixed contact 44. Since the second movable contact 46 continues to be connected to the third fixed contact 44, the lighting state of the LED element 1 is maintained.

  In the state shown in the lower diagram of FIG. 4, it is assumed that the switch 31 is temporarily opened by an open signal from the lighting number control unit 2. In this case, a closed circuit by the wiring 53, the switch 31, the exciting coil 33, the wiring 55, the first movable contact 43, the wiring 56, and the wiring 54 is no longer formed. As a result, no current flows through the exciting coil 33 and the magnetic field formed by the exciting coil 33 disappears. When the magnetic field disappears, the first movable contact 43 moves to the second fixed contact 42 side, and the second movable contact 46 moves to the fourth fixed contact 45 side (see the upper diagram in FIG. 4). ). When the second movable contact 46 moves to the fourth fixed contact 45 side, no current flows through the LED element 1 and the LED element 1 is turned off.

  2 and 3, the lighting number control unit 2 stores a CPU (Central Processing Unit), a volatile memory used as a work area for computations by the CPU, and a program necessary for computations by the CPU. Non-volatile memory.

  When the power supply from the commercial power supply 11 is interrupted and the power supply is switched to the power supply from the storage battery 25 at the time of a power failure, the lighting number control unit 2 turns on the LED element 1 so as to reduce the number of LED lighting. Control the number. Typically, the lighting number control unit 2 detects the power failure by monitoring the voltage supplied from the commercial power supply 11, and the number of lighting of the LED element 1 is reduced so as to reduce the number of lighting of the LED element 1 at the time of the power failure. To control. In the present embodiment, the lighting number control unit 2 controls the number of lighting of the LED element 1 so as to reduce the number of lighting of the LED element 1 for each block by controlling the switch 31 of the relay circuit 3.

  The terminal that the lighting number control unit 2 monitors the voltage of the commercial power supply 11 is disposed between the commercial power supply 11 and the disconnect switch 21, for example. The lighting number control unit 2 may detect a power failure by detecting a change in voltage when the power supply is switched to the power supply from the storage battery 25.

  The lighting number control unit 2 outputs, for example, an open signal to three of the four relay circuits 3 when a power failure is detected, so that a total of six LED elements included in the three blocks are included. 1 is turned off. In this case, the two LED elements 1 in one block are turned on by power supply from the storage battery 25.

  According to the LED illumination 10 according to the present embodiment, when the power supply is switched to the power supply from the storage battery 25 at the time of a power failure, the number of lighting of the LED elements 1 can be automatically reduced. Thereby, the electric current which flows into LED lighting 10 when electric power supply is switched to electric power supply from storage battery 25 can be controlled. Thereby, it can prevent that the voltage of the storage battery 25 falls abnormally, and it can prevent that the whole system goes down.

  In the present embodiment, since the self-holding relay circuit 3 is used, it is possible to prevent unnecessary power from being consumed for the LED element 1 that is turned off.

Second Embodiment
Next, a second embodiment will be described. In the first embodiment described above, when the power supply from the commercial power supply 11 is interrupted during a power failure and the power supply is switched to the power supply from the storage battery 25, the LED elements are reduced so as to reduce the number of lighting of the LED elements 1. The case of controlling the number of lighting 1 has been described. On the other hand, 2nd Embodiment demonstrates the case where the number of lighting of the LED element 1 is controlled so that the number of lighting of the LED element 1 may be reduced when the electric power supply from an electric power company is insufficient.

  FIG. 5 is a diagram illustrating a state when the lighting number of the LED elements 1 is controlled by the lighting number control unit 2 according to the second embodiment.

  In the second embodiment, the lighting number control unit 2 monitors a change in voltage supplied from the commercial power supply 11 in time series. And the lighting number control part 2 controls the lighting number of the LED element 1 so that the lighting number of the LED element 1 may be reduced according to the change of the voltage supplied from the commercial power supply 11. FIG.

  Referring to the upper diagram in FIG. 5, when the voltage supplied from the commercial power supply 11 is equal to or higher than the specified voltage, the lighting number control unit 2 lights all eight LED elements 1 in the four blocks. Let

  With reference to the center diagram in FIG. 5, the lighting number control unit 2 determines that one of the four relay circuits 3 has a voltage that is less than the specified voltage when the voltage supplied from the commercial power supply 11 is less than the specified voltage. An open signal is output to the switch 31. Thereby, the two LED elements 1 in one block are turned off.

  With reference to the lower diagram of FIG. 5, the lighting number control unit 2 applies the switch 31 of one relay circuit 3 to the switch 31 when the voltage supplied from the commercial power supply 11 becomes less than the specified voltage −α. To output an open signal. Thereby, the two LED elements 1 in one block are further turned off.

  Here, the supply voltage of the electric power company is stipulated by law (low voltage legal voltage: 101V ± 6V), but when the power becomes insufficient, the supply voltage decreases and gradually reaches 95V (= 101V-6V). Approaching. On the other hand, in this LED illumination 10, when the supply voltage from the commercial power supply 11 is reduced due to power shortage, the lighting number control unit 2 automatically detects a decrease in the supply voltage, and the number of lighting of the LED elements is automatically determined. Reduced.

  In the second embodiment, when the power supply from the power company is insufficient (for example, midsummer daytime), the number of lighting of the LED elements 1 is reduced, so that the power supply from the power company is insufficient. The power consumption of the LED illumination 10 can be automatically suppressed. In this way, the risk of planned power outage is reduced by making up for the shortage of power supply.

<Third Embodiment>
Next, a third embodiment of the present technology will be described. In the third embodiment, a home energy management system 61 (Home Energy Management System: HEMS) is used to reduce the number of lighting of the LED elements 1 when the power supply from the power company is insufficient.

  FIG. 6 is a diagram illustrating a third embodiment of the present technology. The home energy management system 61 is provided in a house, an office building, or the like, and includes a communication unit, a control unit, and the like (not shown). The control unit includes a CPU, a volatile memory used as a work area for computations by the CPU, and a non-volatile memory in which programs necessary for computations by the CPU are stored.

  The power company 60 transmits power shortage information to the home energy management system 61 via the network when the power is short, such as during midsummer daytime. When the control unit of the home energy management system 61 receives the information about the power shortage via the communication unit, the control unit of the LED lighting 10 is configured to provide instruction information for reducing the number of lighting of the LED elements 1 via the communication unit. 2 to send. Note that the disconnect switch 21 is opened when power shortage information is received.

  When the lighting number control unit 2 receives the instruction information, the lighting number control unit 2 controls the lighting number of the LED elements 1 so as to reduce the lighting number of the LED elements 1. For example, the lighting number control unit 2 outputs a release signal to three relay circuits 3 out of four relay circuits 3 to turn off the total of six LED elements 1 included in the three blocks. In this case, the two LED elements 1 in one block are turned on by power supply from the storage battery 25.

  In the third embodiment, the power company 60 can reduce the number of lighting of the LED lighting 10 provided in a house or an office building by transmitting power shortage information when the power is short. . That is, in the third embodiment, the number of lighting of the LED elements 1 can be positively adjusted by the power company 60.

  According to statistics, the power consumed by the lighting of office buildings in the Tokyo metropolitan area is about 6 million kW. Suppose that the LED lighting 10 according to the present technology is installed instead of the lighting installed in the office building. Then, it is assumed that the lighting number control using the home energy management system 61 is performed, and the number of lighting of the LED element 1 is reduced to 1/10 when power is insufficient. In this case, there is the same effect as placing a power buffer corresponding to 540 kW, that is, five nuclear power plants.

  Here, when the shortage of power is resolved, the power company 60 may transmit power recovery information to the home energy management system 61 via the network. In this case, when the control unit of the home energy management system 61 receives the power recovery information via the communication unit, the control information for increasing the number of LED elements 1 to be lit is turned on via the communication unit. It transmits to the number control part 2. Note that when power recovery information is received, the opened disconnect switch 21 is closed.

  When the lighting number control unit 2 receives the instruction information, the lighting number control unit 2 controls the lighting number of the LED element 1 so as to increase the lighting number of the LED element 1. For example, the lighting number control unit 2 gradually increases the number of lighting of the LED element 1 by controlling the reset switch 32 to temporarily turn on the reset button.

<Fourth embodiment>
Next, a fourth embodiment of the present technology will be described. In the fourth embodiment, the lighting number control unit 2 monitors a change in voltage supplied from the storage battery 25 in time series after the power supply is switched to the power supply from the storage battery 25. And the lighting number control part 2 controls the lighting number of the LED element 1 so that the lighting number of the LED element 1 may be reduced according to the change of the voltage supplied from the storage battery 25. FIG.

  In the fourth embodiment, a terminal for monitoring the voltage in the lighting number control unit 2 is also connected to the storage battery 25.

  FIG. 7 is a diagram illustrating an example of a discharge rate characteristic of the lithium ion secondary battery (storage battery 25). In this example, the nominal capacity is 2000 mAh and the discharge temperature is 20 ° C. Also, 1C = 2.2A. Suppose that the LED illumination 10 has ten LED elements 1 and the discharge rate per LED element 1 is 0.2C. In this case, the total discharge rate of the ten LED elements 1 is 2C.

  When the voltage supplied from the lithium ion secondary battery (storage battery 25) is a specified voltage (for example, 3.4 V) or more, the lighting number control unit 2 turns on all the LED elements 1. On the other hand, when the voltage supplied from the lithium ion secondary battery (storage battery 25) becomes equal to or lower than the specified voltage (3.4V), nine LED elements 1 out of the ten LED elements 1 are turned off.

  In the example shown in FIG. 7, the voltage is 3.4 V or less in the 2C graph when the capacity is about 1250 mAh. For this reason, the number of lighting of the LED element 1 is switched from 10 to 1 at the timing when the capacity becomes about 1250 mAh. One LED element 1 is lit until 2000 mAh is reached. Note that the voltage rises to 3.7 V at the moment when the number of lighting of the LED element 1 is switched from 10 to 1 (see 1250 mAh point in the graph of 0.2 C).

  In 4th Embodiment, when the voltage supplied from the storage battery 25 falls, the number of lighting of the LED element 1 can be reduced. Thereby, although the brightness as the whole LED illumination 10 reduces, the LED illumination 10 can be lighted for a long time.

  The idea of the fourth embodiment can be applied to a flashlight. This flashlight has a plurality of LED elements 1 and a lighting number control unit 2. The lighting number control unit 2 monitors the change in voltage supplied from the storage battery 25 in time series, and the LED element 1 so as to reduce the number of lighting of the LED element 1 according to the change in voltage supplied from the storage battery 25. Controls the number of lights.

<Fifth Embodiment>
Next, a fifth embodiment of the present technology will be described. FIG. 8 is a diagram showing an LED illumination 10 according to the fifth embodiment. As shown in FIG. 8, in the fifth embodiment, the storage battery 25 is connected to some of the relay circuits 3 among the plurality of relay circuits 3. The positive electrode side of the storage battery 25 is connected to the fourth fixed contact 45, and the negative electrode side of the storage battery 25 is connected to the negative electrode side of the LED element 1.

  In the description of the fifth embodiment, the relay circuit 3 provided with the storage battery 25 (left side in FIG. 8) is referred to as a first relay circuit 3a, and the relay circuit 3 provided with no storage battery 25 (right side in FIG. 8). This is called a second relay circuit 3b.

  The lighting number control unit 2 monitors the voltage supplied from the commercial power supply 11, and when the voltage becomes equal to or lower than a specified value, an open signal is sent to the switch 31 of the second relay circuit 3b (right side in FIG. 8). Is output. As a result, the LED element 1 connected to the second relay circuit 3b is turned off.

  In addition, the lighting number control unit 2 monitors the voltage supplied from the commercial power source 11 and detects the occurrence of a power failure when the lighting control unit 2 controls the switch 31 of the first relay circuit 3a (left side in FIG. 8). Output an open signal. In this case, the second movable contact 46 contacts the fourth fixed contact 45, and the storage battery 25 and the LED element 1 are connected by a closed circuit. Thereby, the minimum LED element 1 can be lighted at the time of disaster prevention.

<Various modifications>
In each of the above-described embodiments, the case where the relay circuit 3 is used as the structure for turning off the LED element 1 has been described. On the other hand, an electronic circuit may be provided instead of the relay circuit 3 as a structure for turning off the LED element 1. Here, when an electronic circuit is used as a structure for turning off the LED element 1 and the turn-off of the LED element 1 is directly controlled by the electronic circuit, even if the LED element 1 is turned off, some electric power is generated by the electronic circuit. It will be consumed. On the other hand, in the case of the relay circuit 3, power is not consumed in the relay circuit 3 corresponding to the LED element 1 that has been turned off (see the upper diagram in FIG. 4). Therefore, the relay circuit 3 is more advantageous than the electronic circuit from the viewpoint of power consumption.

  Here, referring to FIG. 1, the lighting number control unit 2 of the LED lighting 10 monitors the power (voltage) generated by the power generation unit 26 in time series, and the LED element according to the change of the voltage. The number of lighting of 1 may be controlled (including both the case of controlling to reduce the number of lighting and the case of controlling to increase). In this case, when the power generation state by the power generation unit 26 is unstable, the current flowing into the storage battery 25 can be controlled to be constant by changing the number of lighting of the LED elements 1.

DESCRIPTION OF SYMBOLS 1 ... LED element 2 ... Lighting number control part 3 ... Relay circuit 10 ... LED illumination 11 ... Commercial power supply 20 ... Electric power feeding system 25 ... Storage battery 26 ... Power generation part

Claims (7)

A plurality of LED elements;
A lighting number control unit that controls the number of lighting of the LED elements so as to reduce the number of lighting of the LED elements when the power supply from the power system is cut off and the power supply is switched to the power supply from the storage battery; LED lighting provided. The LED illumination according to claim 1,
The lighting number control unit controls the number of lighting of the LED elements so as to reduce the number of lighting of the LED elements when power supply from the power system is insufficient. The LED illumination according to claim 2,
The lighting number control unit monitors a change in voltage supplied from the power system in time series, and reduces the number of lighting of the LED elements according to a change in voltage supplied from the power system. LED lighting that controls the number of lighting of LED elements. The LED illumination according to claim 2,
The lighting number control unit receives the instruction information transmitted from the control unit that receives information indicating insufficient power from the power system and transmits instruction information for reducing the number of lighting of the LED elements according to the information. And the LED illumination which controls the lighting number of the said LED element so that the lighting number of the said LED element may be reduced according to the said instruction information. The LED illumination according to claim 1,
After the power supply is switched to the power supply from the storage battery, the lighting number control unit monitors the change in the voltage supplied from the storage battery in time series, and detects the change in the voltage supplied from the storage battery. Accordingly, LED lighting for controlling the number of lighting of the LED elements so as to reduce the number of lighting of the LED elements. The LED illumination according to claim 1,
A plurality of relay circuits having a switch and capable of self-holding;
The plurality of LED elements are divided into a plurality of blocks by being connected to any one of the plurality of relay circuits.
The lighting number control unit controls the number of lighting of the LED element so as to reduce the number of lighting of the LED element for each block by controlling the switch. LED lighting. A plurality of LED elements;
LED lighting comprising: a lighting number control unit that controls the number of lighting of the LED elements so as to reduce the number of lighting of the LED elements when power supply from the power system is insufficient.