JP6751264B2 - Lighting equipment - Google Patents

Description

Embodiments of the present invention relate to a lighting device in which a light source is turned on by a power source of a secondary battery when an external power source is cut off.

2. Description of the Related Art Conventionally, there is a lighting device that displays an evacuation exit or secures the brightness of a passage by lighting a light source by a power source of a secondary battery in an emergency such as a power failure of an external power source. This lighting device is configured to charge the secondary battery with an external power source when there is no power failure, for example.

Such a lighting device requires maintenance and inspection of the state of charge of the secondary battery, that is, the capacity, in order to ensure operation in an emergency. When the secondary battery is discharged for this maintenance/inspection, it may shift to charging before the capacity of the secondary battery is completely used up. In this case, depending on the type of the secondary battery, a memory effect may occur in the secondary battery, and it may be mistakenly recognized that the apparent capacity of the secondary battery has decreased.

JP, 2016-115425, A

The problem to be solved by the present invention is to provide an illuminating device in which the capacity of a secondary battery can be used in an appropriate state.

The lighting device of the embodiment includes a light source, a secondary battery, a lighting circuit, and a charging/discharging circuit. The secondary battery is charged by an external power source. The lighting circuit lights the light source by using the secondary battery as a power source when the external power source is shut off. The charging/discharging circuit has a discharge rate at lighting and a discharge rate at elimination, and controls charging/discharging of the secondary battery. The lighting discharge rate discharges the secondary battery for lighting the light source when the external power supply is cut off. The elimination discharge rate discharges the secondary battery when the memory effect of the secondary battery is eliminated. The elimination discharge rate has a larger current value than the lighting discharge rate.

According to the present invention, when a memory effect occurs in a secondary battery by repeating charging/discharging of the secondary battery, the secondary battery is discharged at a elimination discharge rate in which a current value is larger than a lighting discharge rate. This allows the secondary battery to be discharged to a level at which the memory effect does not occur in a short time and the capacity can be almost used up, and the secondary battery can be refreshed, so that the capacity of the secondary battery can be used in an appropriate state. Can be expected.

It is a circuit diagram of the illuminating device which shows one Embodiment. It is a graph which shows an example of the charging/discharging cycle of the secondary battery of an illuminating device same as the above.

Hereinafter, an embodiment will be described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes an emergency lighting device as a lighting device, and the emergency lighting device 11 is used for an emergency fixture such as a guide light or an emergency light.

A light source module 12 is attachable to and detachable from the emergency lighting device 11, a power supply unit 13 as a constant lighting circuit, a battery B as a backup power source as a secondary battery, and an emergency light as an emergency circuit. Units 14 and are provided.

The light source module 12 includes a light source 15. Although a light bulb, a light emitting element, or the like can be used as the light source 15, in the present embodiment, for example, an LED light source as a light emitting element is used, and a plurality of element bodies, LEDs 15a, are connected in series. Further, the light source 15 can be attached to and detached from an emergency tool (power supply unit 13 and emergency light unit 14) via a socket 17. As the light emitting element, an organic EL element, an inorganic EL element, or the like may be used instead of the LED.

The battery B is a rechargeable battery pack in which a plurality of DC power supplies are connected in series, and has a capacity capable of maintaining the lighting state of the light source 15 (LED 15a) with a predetermined light flux for a predetermined time or more when the external power supply e fails. doing. As the battery B, for example, a Nicad battery, a nickel hydrogen battery, or the like is used.

The power supply unit 13 uses the external power source e as a power source to turn on the light source 15 (LED 15a) when the external power source e is not interrupted. The power supply unit 13 includes a switching element (not shown) and the like. The switching control of the switching element is performed by a lighting control circuit including a microcomputer (not shown) as control means, thereby converting the current from the external power source e and converting the light source. 15 is a constant current circuit (LED driver) that outputs a constant current to the LED 15a. The power supply unit 13 is electrically connected to the external power supply e via a power switch SW1. The power supply unit 13 includes a connection detection circuit (attachment/detachment detection circuit) that detects whether or not the light source module 12 (light source 15) is connected to the output side (attachment/detachment of the light source module 12 (light source 15)). Good. Further, the power supply unit 13 is not an essential component.

The power switch SW1 is installed, for example, on a wall surface or the like, and is manually operated to switch ON/OFF of the light source 15 (LED 15a). If the power supply unit 13 is not provided, this power switch SW1 is also unnecessary.

In the emergency light unit 14, a noise prevention circuit 21 which is a filter circuit for removing noise from the external power supply e side is electrically connected to the external power supply e. The noise prevention circuit 21 is electrically connected to the input side of a rectifier circuit 22 such as a diode bridge that rectifies (full-wave) the external power supply e. Further, on the output side of the rectifier circuit 22, a power supply monitoring circuit 23 that monitors the supply state of the power from the external power supply e, that is, a power failure and a non-power failure, an electrolytic capacitor C1 for smoothing, and a primary side of the transformer Tr. , A series circuit with the power supply circuit 24 is sequentially electrically connected. A charging circuit 25 for charging the battery B is electrically connected to the secondary side of the transformer Tr via a rectifying/smoothing circuit of a rectifying rectifying element D and a smoothing electrolytic capacitor C2. In addition, an emergency lighting circuit 26 as a lighting circuit for lighting the light source 15 in parallel with the charging circuit 25 is electrically connected to the battery B. Then, on the output side of the emergency lighting circuit 26, a switching unit 27 that selectively electrically connects either one of the emergency light unit 14 and the power supply unit 13 to the light source 15 is electrically connected. The power supply monitoring circuit 23, the charging circuit 25, the emergency lighting circuit 26, and the switching unit 27 include a control circuit as a control unit that controls the operations of the charging circuit 25, the emergency lighting circuit 26, the switching unit 27, and the like. 28 is electrically connected, and the control circuit 28 is electrically connected with an inspection switch SW2 for instructing inspection of the charged state and life of the battery B.

Although not shown, the noise prevention circuit 21 includes, for example, a varistor and a capacitor connected between power supply lines and a common mode choke.

The power supply circuit 24 is, for example, an IPD circuit using an IPD as a power device.

The charging circuit 25 is, for example, a constant current circuit or the like that charges the battery B with the external power source e, and its operation is controlled by the control circuit 28.

The emergency lighting circuit 26 turns on the light source 15 (LED 15a) by using the battery B as a power source when the external power source e is interrupted or when the charge state and life of the battery B is checked.

The emergency lighting circuit 26 may be provided with a drawing circuit that limits an overcurrent flowing through the light source 15 (LED 15a), for example.

The switching unit 27 is, for example, a relay or the like, and is capable of selectively switching the light source 15 between the power supply unit 13 and the emergency lighting circuit 26 (emergency light unit 14). If the power supply unit 13 is not provided, the switching unit 27 is also unnecessary.

The inspection switch SW2 is a normally open switch, and is closed by the operation of the inspector to instruct the inspection of the charged state and the life of the battery B.

The control circuit 28 includes, for example, a microcomputer, and based on the monitoring result of the external power supply e by the power supply monitoring circuit 23 and the detection result of the closing of the inspection switch SW2, that is, the on/off switching of the inspection switch SW2, The operations of the charging circuit 25, the emergency lighting circuit 26, and the switching unit 27 are switched. Therefore, the control circuit 28 has a function of a charging/discharging circuit that controls charging/discharging of the battery B. The control circuit 28 has a plurality of battery B discharge rates. The control circuit 28 also has the function of a voltage detection circuit that detects and monitors the voltage of the battery B. Further, although not shown, a monitor lamp or the like for displaying (notifying) the inspection operation or inspection result of the battery B is electrically connected to the control circuit 28.

Here, as the above-mentioned discharge rate, the discharge rate at lighting that discharges the battery B for lighting the light source 15 (LED 15a) when the external power supply e is cut off, and the battery B discharged at the time of checking (checking) the capacity of the battery B A plurality of confirmation discharge rates to be set are set. In the present embodiment, the confirmation-time discharge rate has a first confirmation-time discharge rate and a second confirmation-time discharge rate as a resolution-time discharge rate.

The first confirmation-time discharge rate is for discharging the battery B during normal confirmation (inspection) of the capacity of the battery B. More specifically, the first confirmation discharge rate is, for example, by discharging the battery B and turning on the light source 15 (LED 15a) in the same manner as when the external power source e is cut off, and thus a predetermined time (predetermined standard This is for inspecting whether or not the light source 15 (LED 15a) can maintain a predetermined luminous flux during the emergency rated lighting time of the emergency lighting device 11 defined by (1). Therefore, the first confirmation discharge rate may be a discharge rate having the same current value (C value) as the lighting discharge rate. Further, when the battery B is inspected for a short time by predicting the subsequent change in the voltage of the battery B based on the change in the voltage (gradient of voltage) at the initial stage of discharging the battery B, for example, the first confirmation discharge The rate may be a discharge rate different from the discharge rate during lighting (having a larger current value than the discharge rate during lighting). Further, as the first confirmation discharge rate, for example, a discharge rate similar to the lighting discharge rate and a discharge rate different from the lighting discharge rate may be provided.

The second confirmation discharge rate is for discharging the battery B in order to refresh the battery B and eliminate the memory effect when the battery B is abnormal. In the present embodiment, the second confirmation discharge rate is a discharge rate having a larger current value (C value) than the lighting discharge rate and the first confirmation discharge rate.

Next, the operation of the above embodiment will be described.

The switching unit 27 connects the light source 15 to the power supply unit 13 when the power switch SW1 is turned on and the external power supply e is supplied, that is, when there is no power failure. Then, the power supply unit 13 whose operation is controlled by the lighting control circuit converts the current supplied from the external power supply e into a constant current by, for example, switching of the switching element and rectifying and smoothing, and supplies the constant current to the light source 15 (LED 15a). The light source 15 (LED 15a) is turned on with a predetermined luminous flux (normal lighting). Further, in the emergency light unit 14, regardless of whether the power switch SW1 is turned on or off, the current supplied from the external power source e has the noise prevention circuit 21 remove noise such as high-frequency components, and the rectifier circuit 22 and the electrolytic capacitor C1. Is supplied to the transformer Tr after being rectified and smoothed by the rectification smoothing circuit of the diode D and the electrolytic capacitor C2 connected to the secondary side of the transformer Tr and rectified and smoothed by the power supply circuit 24. A smoothed DC current is supplied to the charging circuit 25, and the charging circuit 25 charges the battery B. At this time, the control circuit 28 monitors the voltage of the battery B being charged, monitors the state of charge of the battery B based on this voltage, and controls the operation of the charging circuit 25, thereby overcharging the battery B, etc. Prevent.

On the other hand, when the external power supply e fails, that is, when the power supply monitoring circuit 23 detects the external power supply e, the control circuit 28 switches the switching unit 27 so that the connection of the light source 15 is lit from the power supply unit 13 in an emergency. While switching to the circuit 26 (emergency light unit 14), the charging circuit 25 is stopped. The emergency lighting circuit 26, whose operation is controlled by the control circuit 28, converts the current discharged from the battery B at the lighting discharge rate and supplies the converted current to the light source 15 (LED15a). Light with luminous flux (emergency lighting).

Further, when the inspector operates the inspection switch SW2 to instruct inspection of the charge state and life of the battery B (during automatic inspection), when the control circuit 28 detects the on/off switching of the inspection switch SW2, By switching the switching unit 27 by the control circuit 28, the connection of the light source 15 is switched from the power supply unit 13 to the emergency lighting circuit 26 (emergency light unit 14) to create a pseudo power failure state (pseudo power failure state). At the same time, the charging circuit 25 is instructed to discharge from the battery B to the emergency lighting circuit 26. The emergency lighting circuit 26 whose operation is controlled by the control circuit 28 converts the current discharged from the battery B at the first confirmation discharge rate and supplies the converted current to the light source 15 (LED15a). ) Is lit with a predetermined luminous flux (inspection lighting). In this state, the control circuit 28 monitors the voltage of the battery B via the charging circuit 25, and after a predetermined time from the start of the inspection (than the emergency rated lighting time of the emergency lighting device 11 defined by a predetermined standard, By determining whether or not the voltage of the battery B measured after a long time has elapsed (storage battery voltage measurement time) is equal to or greater than a predetermined threshold value set in advance, the light source 15 (LED15a) causes the predetermined light flux during inspection lighting. Whether or not the battery B has a capacity for maintaining the above condition for lighting for a predetermined time (emergency rated lighting time) or more, that is, whether or not the battery B is normal, in other words, whether or not the battery B needs to be replaced. Can be inspected.

When the inspection is desired to be stopped, the inspection switch SW2 is operated again to stop the inspection and restart the charging of the battery B by the charging circuit 25. Further, for example, when the external power supply e fails during the inspection, the inspection is stopped when the power supply monitoring circuit 23 detects the power outage, and the control circuit 28 discharges the battery B at the second discharge rate to cause the emergency lighting circuit. 26 turns on the light source 15.

When it is determined that the battery B does not need to be replaced after the inspection of the battery B, the control circuit 28 switches the switching unit 27 again to connect the light source 15 to the emergency lighting circuit 26 (emergency light unit). The battery B is charged by switching from 14) to the power supply unit 13 and reactivating the charging circuit 25. The charging of the battery B may be automatically restarted immediately, for example, or may be restarted by operating the inspection switch SW2 again after a predetermined time has elapsed.

Further, when there is an abnormality in the battery B, the control circuit 28 notifies the abnormality to the outside by a monitor lamp, and causes the battery B to discharge at the second confirmation discharge rate as necessary. The discharge of the battery B at the second confirmation discharge rate may be performed, for example, when the inspector performs a predetermined operation using the inspection switch SW2 or the like, or automatically when the abnormality of the battery B is detected. You may go to When the battery B is discharged at the second confirmation discharge rate, the control circuit 28 switches the switching unit 27 to shut off the light source 15 from the emergency lighting circuit 26 (emergency light unit 14). You may.

Then, according to the second confirmation discharge rate, the battery B is discharged in a short time, the capacity is almost used up, and the memory effect is refreshed. At this time, the control circuit 28 monitors the voltage of the battery B, and when the voltage of the battery B reaches the discharge end voltage, stops the discharge of the battery B and prevents deep discharge. Even if the inspection result is normal, the control circuit 28 may notify the inspection result to the outside by the monitor lamp. Then, when the refreshing of the battery B is completed, or when there is no abnormality in the battery B, the battery B is charged via the charging circuit 25 in the same manner as above.

As described above, in the case of inspecting the battery B, the inspection may be completed before almost all the capacity of the battery B is used up, that is, without fully discharging the battery B, and the battery B may be charged. In particular, when the battery B is inspected for a short time, the battery B is charged without using the capacity of the battery B. If it is determined that the battery B does not need to be replaced, the battery B repeats shallow charging/discharging every time the battery B is repeatedly inspected, and the battery B has a memory effect independently of the deterioration of the battery B itself. appear. As a result, the discharge voltage of the battery B decreases over time, or the discharge time shortens (for example, the period P1 in FIG. 2), so it is erroneously recognized that the capacity of the battery B has decreased during inspection. May cause.

Therefore, according to the embodiment described above, when a memory effect occurs in the battery B by repeating charging/discharging of the battery B, such as an inspection, the control circuit 28 causes the second checking discharge rate (when canceling). By discharging the battery B at the discharge rate), the battery B can be discharged to a level at which the memory effect does not occur, that is, near the discharge end voltage, and the capacity can be almost used up, so that the battery B can be refreshed. As a result, the discharge voltage and discharge time of the battery B can be restored by charging the battery B (for example, P2 after refresh discharge in FIG. 2), the capacity of the battery B can be used in an appropriate state, and the light source 15 The lighting time can be secured.

Further, since the second confirmation discharge rate has a larger current value than the lighting discharge rate, the capacity of the battery B can be almost used up and the memory effect can be eliminated in a short time.

Further, when determining whether or not the battery B is abnormal by detecting the voltage of the battery B, when the battery B is erroneously recognized as abnormal because the voltage of the battery B has dropped due to a memory effect. Is also envisioned. Therefore, when the control circuit 28 discharges the battery B by switching to the second confirmation discharge rate when it is determined that the battery B is abnormal, the battery B is unnecessarily unnecessary when the memory effect is eliminated. Will not be replaced. Then, after discharging the battery B at the second confirmation discharge rate, the control circuit 28 switches to the lighting discharge rate or the first confirmation discharge rate, so that the light source when the external power source e is cut off. It becomes possible to discharge the battery B for lighting 15 and to recheck the battery B.

Further, since the control circuit 28 stops the discharge of the battery B when the discharge end voltage is reached, it is possible to prevent the deep discharge of the battery B, especially when the battery B is refreshed, and further extend the life of the battery B.

In the above embodiment, the power supply unit 13 and the emergency lighting circuit 26 are switched so that only one of them is connected to the light source 15 by using the switching unit 27. And the emergency lighting circuit 26 are connected in parallel to the light source 15, and the operation of the power supply unit 13 and the emergency lighting circuit 26 is selectively switched in response to the monitoring of the external power supply e by the power supply monitoring circuit 23. You can

Further, the voltage detection circuit for detecting the voltage of the battery B may be provided separately from the control circuit 28.

Further, the control circuit 28 may discharge the battery B not only when the battery B is abnormal but also at a second confirmation discharge rate (elimination discharge rate) at any timing to eliminate the memory effect.

The confirmation discharge rate is set to a discharge rate having a larger current value than the lighting discharge rate. However, even if the current value is the same as or smaller than the lighting discharge rate, it takes time until the capacity of the battery B is almost used up. Any discharge rate may be used as long as it is discharged.

Although one embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and an equivalent range thereof.

11 Emergency lighting device as a lighting device
15 light source
26 Emergency lighting circuit as lighting circuit
28 Control circuit having functions of charge/discharge circuit and voltage detection circuit B Battery as secondary battery e External power supply

Claims (3)

Light source;
A secondary battery charged by an external power source;
A lighting circuit for lighting the light source using the secondary battery as a power source when the external power source is cut off;
A lighting discharge rate for discharging the secondary battery for lighting the light source when the external power source is cut off, and a cancellation discharge rate for discharging the secondary battery when the memory effect of the secondary battery is canceled, A charge/discharge circuit for controlling charge/discharge of the secondary battery;
Equipped with,
The lighting device is characterized in that the discharge discharge rate has a larger current value than the lighting discharge rate . The charging and discharging circuit, the lighting device according to claim 1, characterized in that discharging the resolving time of the secondary battery by switching the discharge rate at the time of abnormality of the secondary battery. A voltage detection circuit for detecting the voltage of the secondary battery,
The lighting device according to claim 1 or 2 , wherein the charging/discharging circuit stops discharging the secondary battery when the voltage detecting circuit determines that the secondary battery has discharged to a discharge end voltage. ..

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