JP2019029171A - Disaster prevention lamp lighting device and disaster prevention lamp - Google Patents

Abstract

To obtain a disaster prevention lamp lighting device and disaster prevention lamp, capable of suppressing reduction in charging efficiency in response to reduction in battery voltage.SOLUTION: A disaster prevention lamp lighting device according to the invention comprises: a power supply circuit for generating a charging power source; a constant current circuit that receives supply of power from the charging power source and outputs charging current; a battery that is charged with the charging current and lights up a lamp at the time of outage; an outage detection circuit that detects outage by detecting interception of the charging current; and a control circuit that detects battery voltage generated across both ends of the battery and controls the power supply circuit so as to reduce voltage of the charging power source as the battery voltage reduces. To the control circuit, power is supplied from the charging power source when a power source is supplied from the outside to the power supply circuit, and power is supplied from the battery at the time of outage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disaster prevention lamp lighting device and a disaster prevention lamp.

  Patent Document 1 discloses a charging device including a constant voltage generating unit and a constant current charging unit. The charging device charges the secondary battery. The output voltage of the constant voltage generating means increases as the voltage of the secondary battery increases. This prevents a potential difference more than necessary from occurring in the input / output voltage of the constant current charging means. Therefore, the charging efficiency can be improved.

JP-A-5-308733

  Generally, in a charging circuit including a constant current circuit such as a linear constant current circuit, a potential difference is required between the input and output of the constant current circuit. The input of the constant current circuit is connected to the charging power source, and the output of the constant current circuit is connected to the battery. That is, it is necessary to prepare a charging power source having a voltage higher than the maximum value of the battery voltage. In general, a potential difference of, for example, about 3 V or more is required between the charging power source and the battery voltage.

  In the emergency light lighting device, the maximum value of the battery voltage may decrease due to aging degradation or the like. When the maximum value of the battery voltage decreases, the potential difference between the battery and the charging power source increases. This may increase the power consumption of the constant current circuit. On the other hand, the charging device disclosed in Patent Document 1 assumes control when the battery voltage increases due to charging, and does not consider the case where the battery voltage decreases.

  In general, the range of change in battery voltage tends to be large in a disaster light lighting device. For this reason, when applying the charging device shown by patent document 1 to a disaster prevention lamp lighting device, there exists a possibility that a power failure detection cannot be performed stably by the fall of a battery voltage. Furthermore, it may be difficult to secure a power source for a control circuit or the like.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a disaster light lighting device and a disaster light that can suppress a decrease in charging efficiency with respect to a decrease in battery voltage.

  A disaster prevention lamp lighting device according to the present invention includes a power supply circuit that generates a charging power supply, a constant current circuit that receives supply of power from the charging power supply and outputs a charging current, and is charged by the charging current, A battery to be lit, a power failure detection circuit for detecting a power failure by detecting interruption of the charging power source, a battery voltage generated at both ends of the battery, and a voltage of the charging power source as the battery voltage decreases. And a control circuit that controls the power supply circuit so as to reduce power, and when the power is supplied to the power supply circuit from the outside, the control circuit is supplied with power from the charging power supply, and at the time of a power failure Power is supplied from the battery.

  In the disaster prevention lamp lighting device according to the present invention, the control circuit decreases the voltage of the charging power source as the battery voltage decreases. Therefore, it is possible to suppress a decrease in charging efficiency with respect to a decrease in battery voltage.

2 is a circuit block unit of a disaster prevention lamp according to Embodiment 1; It is a figure explaining operation | movement of the disaster prevention lamp which concerns on Embodiment 1. FIG. 6 is a circuit block diagram of a disaster prevention light according to Embodiment 2. FIG. It is a figure explaining operation | movement of the disaster prevention lamp which concerns on Embodiment 2. FIG.

  A disaster light lighting device and a disaster light according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment 1 FIG.
FIG. 1 is a circuit block unit of the disaster prevention lamp 100 according to the first embodiment. The disaster light 100 includes a disaster light lighting device 50 and a lamp 6. The emergency light lighting device 50 lights the lamp 6 at the time of a power failure. The disaster light lighting device 50 is connected to the commercial power source 1. In normal use, the disaster light lighting device 50 is supplied with power from the commercial power source 1. The normal use indicates a state in which the disaster light lighting device 50 is energized from the commercial power source 1.

  The power supply circuit 2 is a flyback circuit. The power supply circuit 2 is supplied with power from the commercial power supply 1 and generates a charging power supply. The voltage of the charging power supply is Vf. The power supply circuit 2 is not limited to a flyback circuit, and any circuit that can generate power from the commercial power supply 1 can be adopted. In the present embodiment, the commercial power source 1 is an AC power source. Not limited to this, the commercial power source 1 may be a DC power source or the like.

  A constant current circuit 3 is connected to the power supply circuit 2 through a cutting circuit 10. The constant current circuit 3 is supplied with power from the charging power source and outputs a charging current Ic. The constant current circuit 3 has a detection resistor. When charging current Ic flows through the detection resistor, a voltage is generated across the detection resistor. The constant current circuit 3 is controlled so that this voltage is constant. That is, in the constant current circuit 3, the output voltage is controlled so that the charging current Ic is constant.

  The voltage Vf of the charging power supply is stepped down by the constant current circuit 3. The output voltage of the constant current circuit 3 corresponds to the battery voltage Vb generated at both ends of the battery 4. The constant current circuit 3 outputs a stabilized current using the charging power source as a power source.

  The disaster light lighting device 50 includes a battery 4. The battery 4 is charged with the charging current Ic. A booster circuit 5 is connected to the battery 4. During a power failure, the battery 4 supplies power to the booster circuit 5. The booster circuit 5 turns on the lamp 6. Therefore, the battery 4 turns on the lamp 6 at the time of a power failure. Here, the time of a power failure means a state where the supply of power from the commercial power supply 1 to the power supply circuit 2 is interrupted in an emergency.

  A power failure detection circuit 11 is connected to the output of the power supply circuit 2. The power failure detection circuit 11 detects energization of the commercial power source 1 and a power failure by detecting the output voltage of the power circuit 2. The power failure detection circuit 11 detects a power failure by detecting the interruption of the charging power source. Further, when the voltage Vf of the charging power supply is normally output, the power failure detection circuit 11 detects energization of the commercial power supply 1.

  A control circuit 7 is connected to the output of the power failure detection circuit 11. The detection result of the energization or power failure of the commercial power source 1 is transmitted from the power failure detection circuit 11 to the control circuit 7. Thereby, the control circuit 7 detects energization or a power failure of the commercial power source 1.

  The output of the power supply circuit 2 is connected to the anode of a diode. The input of the linear power supply 8 is connected to the cathode of the diode. A control circuit 7 and a booster circuit 5 are connected to the output of the linear power supply 8. The linear power supply 8 steps down the voltage Vf of the charging power supply and generates a voltage Vc of the control power supply. The control power supply is a power supply for the control circuit 7. Thus, when power is supplied to the power supply circuit 2 from the outside, power is supplied to the control circuit 7 from the charging power supply.

  Power from the control power supply is also supplied to the booster circuit 5. The control power may be supplied from the control power to, for example, an IC provided in the booster circuit 5.

  The battery 4 is connected to the input of the boost power source 9. The output of the boost power supply 9 is connected to the input of the linear power supply 8. At the time of a power failure, the battery voltage Vb applied across the battery 4 is boosted by the boost power supply 9 and input to the linear power supply 8. The battery voltage Vb is supplied to the control circuit 7 via the boost power supply 9 and the linear power supply 8. Therefore, power is supplied from the battery 4 to the control circuit 7 during a power failure.

  The disaster prevention light 100 has an inspection function. The cutting circuit 10 cuts off the supply of power from the charging power source to the constant current circuit 3 when the disaster prevention lamp lighting device 50 is inspected. The inspection is performed in a state where the commercial power source 1 is energized except during a power failure. The disaster prevention light 100 includes an inspection switch. At the time of inspection, the operator operates the inspection switch. As a result, the inspection function is turned on.

  When the inspection function is turned on, the control circuit 7 controls the cutting circuit 10. As a result, the current path from the power supply circuit 2 to the constant current circuit 3 is interrupted. Therefore, the charging operation from the commercial power source 1 to the battery 4 is stopped, and a power failure is simulated. In the inspection, the lamp 6 is turned on by supplying power from the battery 4 as in the case of a power failure. Therefore, the operation of the disaster prevention lamp 100 can be confirmed. At the time of inspection, the control circuit 7 operates with power supplied from the charging power source.

  The control circuit 7 detects the battery voltage Vb generated at both ends of the battery 4. The control circuit 7 outputs a control signal according to the battery voltage Vb and controls the output voltage of the power supply circuit 2. The control circuit 7 controls the power supply circuit 2 so that the voltage Vf of the charging power supply decreases as the battery voltage Vb decreases.

  The control circuit 7 controls the voltage Vf of the charging power supply to be higher than the battery voltage Vb by a certain voltage. In the present embodiment, voltage Vf is controlled to be 1 V higher than battery voltage Vb. However, the voltage Vf is not limited to this and may be higher than the battery voltage Vb.

  The output of the control circuit 7 is connected to the input of the voltage control circuit 12. The voltage control circuit 12 outputs a signal for controlling the voltage Vf in accordance with the control signal output from the control circuit 7. The control circuit 7 controls the charging power source via the voltage control circuit 12.

  The disaster light lighting device 50 includes a limiter circuit 13. The limiter circuit 13 is connected to the output of the voltage control circuit 12. The output of the limiter circuit 13 is connected to the power supply circuit 2. The limiter circuit 13 limits the signal output from the voltage control circuit 12 so that the power supply circuit 2 outputs a voltage Vf equal to or higher than the first voltage V1. That is, the limiter circuit 13 maintains the voltage Vf of the charging power source at the first voltage V1 or higher.

  FIG. 2 is a diagram for explaining the operation of the disaster prevention lamp 100 according to the first embodiment. The control of the power supply circuit 2 by the control circuit 7 will be described with reference to FIG. In general, the maximum value of the battery voltage Vb decreases due to aging. The battery voltage Vb of the disaster prevention lamp 100 newly provided at time t1 decreases as time passes, as shown in FIG. 2, at time t2. In the present embodiment, the control circuit 7 decreases the voltage Vf of the charging power supply as the battery voltage Vb decreases due to aging. Therefore, at time t1 to t2, the voltage Vf decreases so that the difference between the voltage Vf and the battery voltage Vb maintains 1V.

  Assume that a power failure occurs at times t2 to t3. At this time, the lamp 6 is turned on by the battery 4. Accordingly, the battery voltage Vb decreases due to the discharge of the battery 4. At this time, power is supplied from the battery 4 to the control circuit 7. Moreover, the voltage Vf at the time of a power failure is zero.

  It is assumed that the power failure is resolved at time t3 to t4, and energization from the commercial power source 1 to the disaster prevention lamp lighting device 50 is recovered. Thereby, the battery 4 is charged again. Therefore, the battery voltage Vb recovers at time t4. At this time, power is supplied to the control circuit 7 from the charging power source.

  Here, the minimum value of the battery voltage Vb at the time when the power failure is eliminated may be 0V. For this reason, if the voltage Vf is set to be 1V higher than the battery voltage Vb regardless of the value of the battery voltage Vb, the voltage Vf becomes 1V at the minimum. Therefore, there is a possibility that the input voltage of the linear power supply 8 is insufficient and the control power supply cannot be secured. On the other hand, the limiter circuit 13 maintains the voltage Vf of the charging power source at the first voltage V1 or higher. The first voltage V1 is the lowest voltage Vf that is supplied with power from the charging power source and operates the control circuit 7. As shown in FIG. 2, in the region where the battery voltage Vb is equal to or lower than the second voltage V2, the voltage Vf is maintained at the first voltage V1 even if the battery voltage Vb decreases. Thereby, it is possible to prevent the voltage Vf of the charging power supply from being lowered to a voltage at which the output voltage of the linear power supply 8 is insufficient. Therefore, a control power supply can be secured.

  The constant current circuit 3 consumes power obtained by multiplying the difference between the charging power supply voltage Vf and the battery voltage Vb by the charging current Ic. For this reason, if the voltage Vf is constant regardless of the battery voltage Vb, the power consumption increases especially when the battery voltage Vb decreases. Thereby, the emitted-heat amount of the disaster prevention lamp lighting device 50 becomes large. In particular, when the battery voltage Vb decreases due to deterioration over time, the difference from the voltage Vf increases, and therefore, measures may be required so that the disaster prevention lamp lighting device 50 does not break down.

  On the other hand, in the present embodiment, the voltage Vf of the charging power supply is variable. The control circuit 7 changes the voltage Vf according to the battery voltage Vb of the battery 4 that is the load of the constant current circuit 3. By lowering the voltage Vf as the battery voltage Vb is lower, the difference between the voltage Vf and the battery voltage Vb can be reduced in a region where the battery voltage Vb is lower than when the voltage Vf is constant. Therefore, the power consumption of the disaster prevention lamp lighting device 50 can be reduced.

  In particular, when the maximum voltage of the battery voltage Vb is reduced due to deterioration over time, it is possible to suppress a reduction in charging efficiency. Moreover, the failure of the disaster prevention lamp 100 due to aged deterioration can be suppressed.

  Moreover, in order to suppress the temperature rise of the apparatus, it is generally necessary to use a heat radiating member such as a heat radiating circuit using a heat radiating component or a heat radiating pad. In this Embodiment, the heat_generation | fever of the disaster prevention lamp lighting device 50 can be suppressed by reducing the power consumption of the disaster prevention lamp lighting device 50. FIG. For this reason, use of a heat dissipation circuit or a heat dissipation member can be reduced. Therefore, the disaster prevention lamp lighting device 50 can be reduced in size. Moreover, the manufacturing cost of the disaster prevention lamp lighting device 50 can be reduced.

  Furthermore, in this embodiment, the control power supply can be secured by the limiter circuit 13 even when the voltage Vf of the charging power supply decreases. Thereby, the control circuit 7 can be operated stably. Therefore, the power supply circuit 2 can be controlled stably. In particular, in the disaster prevention lamp 100, the battery voltage Vb varies widely. In the present embodiment, the control circuit 7 can be stably operated even when the battery voltage Vb varies over a wide range.

  In addition, when the voltage Vf of the charging power supply decreases excessively, the power failure detection circuit 11 may erroneously detect the interruption of the charging power supply. For this reason, the power failure detection circuit 11 may malfunction. In the present embodiment, the voltage Vf is maintained at the first voltage V1 or higher. Therefore, it is possible to prevent erroneous detection of a power failure and stably detect the power failure. Here, the 1st voltage V1 shall be set higher than the voltage which the power failure detection circuit 11 judges the interruption | blocking of a charging power supply.

  Moreover, in this Embodiment, a check can be implemented by stopping the charge to the battery 4 by the cutting circuit 10. Therefore, the inspection work can be easily performed.

  In the present embodiment, the voltage Vf is maintained at the first voltage V1 in the region where the battery voltage Vb is equal to or lower than the second voltage V2. Not limited to this, the voltage Vf may be maintained at the first voltage V1 or higher. In the present embodiment, the voltage Vf of the charging power supply is set to be higher than the battery voltage Vb by a certain voltage. As a modification, the difference between the voltage Vf of the charging power source and the battery voltage Vb may not be constant.

  These modifications can be appropriately applied to the disaster light lighting device and the disaster light according to the following embodiments. In addition, since there are many common points with Embodiment 1 about the disaster light lighting device and disaster light which concern on the following embodiment, it demonstrates centering around difference with Embodiment 1. FIG.

Embodiment 2. FIG.
FIG. 3 is a circuit block diagram of the disaster prevention lamp 200 according to the second embodiment. The disaster light 200 includes a disaster light lighting device 250. In the disaster prevention lamp lighting device 250, the constant current circuit is the resistor 14. The cutting circuit is a diode 15. The diode 15 has an anode connected to the power supply circuit 2 and a cathode connected to a resistor 14.

  The constant current circuit 3 of the first embodiment is controlled so that the voltage applied to the detection resistor is constant. Here, by controlling the output voltage of the power supply circuit 2, even if the constant current circuit 3 is replaced with the resistor 14, the charging current Ic can be maintained at a constant current.

  In addition, when the disaster prevention lamp lighting device 50 is inspected, the control circuit 7 makes the voltage Vf of the charging power supply lower than the battery voltage Vb. Thereby, the current flowing through the resistor 14 is cut off by the diode 15. Accordingly, power supply from the charging power source to the resistor 14 is interrupted. Thereby, operation check of disaster prevention light 100 can be performed. At this time, the voltage Vc of the control power supply may be insufficient due to the decrease in the voltage Vf. In this case, as in the case of a power failure, power is supplied from the battery 4 to the control power source via the boosting power source 9 at the time of inspection.

  In the first embodiment, a potential difference of about 1 to 3 V is required at both ends of the constant current circuit 3 due to limitations of the internal circuit of the constant current circuit 3. On the other hand, when the constant current circuit is the resistor 14, the potential difference between both ends of the resistor 14 is not limited. For this reason, the power consumption in the resistor 14 can be suppressed by adjusting the resistance value.

  For example, the potential difference between both ends of the resistor 14 is 3 V, and the resistance value is 30Ω. At this time, a constant current of 100 mA is obtained as the charging current Ic. Further, the power consumption of the resistor 14 is 3 V × 0.1 A = 0.3 W. On the other hand, even when the potential difference is 1 V and the resistance value is 10Ω, a constant current of 100 mA can be obtained similarly. However, the power consumption of the resistor 14 is 1 V × 0.1 A = 0.1 W, which is reduced to 1/3 when the potential difference is 3 V and the resistance value is 30Ω.

  However, when the resistance value of the resistor 14 is decreased, the voltage that can be applied to the resistor 14 is decreased. For this reason, especially when the battery voltage Vb decreases, if the voltage Vf is made constant by the limiter circuit 13, heat generation will increase. For this reason, the first voltage V1b at which the limiter circuit 13 operates may be set as low as possible.

  FIG. 4 is a diagram for explaining the operation of the disaster prevention lamp 200 according to the second embodiment. In the present embodiment, power is supplied from the battery 4 to the control circuit 7 when the battery voltage Vb becomes lower than the second voltage V2 in a state where power is supplied to the power supply circuit 2 from the outside. The second voltage V2 is the battery voltage Vb when the charging power supply voltage Vf = V1a. The voltage V1a is the lowest voltage Vf that is supplied with power from the charging power source and operates the control circuit 7.

  In the present embodiment, when power supply from the charging power supply to the control power supply is insufficient, the booster power supply 9 used in an emergency is used to supply power from the battery 4 to the control power supply. Here, the boosting power source 9 cannot boost when the battery voltage Vb is 0V. For this reason, the limiter circuit 13 maintains the voltage Vf of the charging power supply at the first voltage V1b or higher. The first voltage V1b is the lowest voltage Vf that is supplied with power from the charging power supply and operates the boosting power supply 9. In the region where the battery voltage Vb is equal to or lower than the third voltage V3, the voltage Vf is maintained at the first voltage V1b even if the battery voltage Vb decreases.

  From the above, the first voltage V1b at which the limiter circuit 13 operates can be set lower than in the first embodiment. That is, the control for lowering the voltage Vf as the battery voltage Vb decreases can be performed up to a region where the voltage Vf is lower than that in the first embodiment. Therefore, even when the constant current circuit is the resistor 14, heat generation can be suppressed.

  In the present embodiment, the constant current circuit and the cutting circuit can be simplified as compared with the first embodiment. On the other hand, in the present embodiment, as in the first embodiment, it is possible to maintain performance such as a reduction in power consumption and an inspection function. Furthermore, by reducing the resistance value of the resistor 14, the power consumption at the resistor 14 can be suppressed.

  The technical features described in each embodiment may be used in appropriate combination.

100, 200 Disaster light, 50, 250 Disaster light lighting device, 2 power supply circuit, 3 constant current circuit, 4 battery, 6 lamp, 7 control circuit, 10 disconnection circuit, 11 power failure detection circuit, 13 limiter circuit, 14 resistance, 15 Diode, Ic charging current, V1 first voltage, V2 second voltage, Vb battery voltage, Vf voltage

Claims (10)

A power supply circuit for generating a charging power supply;
A constant current circuit that receives supply of power from the charging power source and outputs a charging current;
A battery that is charged by the charging current and lights a lamp in the event of a power failure;
By detecting the interruption of the charging power supply, a power failure detection circuit that detects a power failure,
A control circuit for detecting a battery voltage generated at both ends of the battery and controlling the power supply circuit so as to reduce the voltage of the charging power supply as the battery voltage decreases;
With
The power supply circuit is supplied with electric power from the charging power supply when the power supply circuit is supplied from outside, and the control circuit is supplied with electric power from the battery during a power failure.   The said control circuit reduces the voltage of the said charging power supply with the fall of the said battery voltage by aged deterioration, The disaster light lighting device of Claim 1 characterized by the above-mentioned.   3. The disaster light lighting device according to claim 1, further comprising a disconnect circuit that cuts off power supply from the charging power source to the constant current circuit when the disaster light lighting device is inspected. 4. The cutting circuit is a diode having the anode connected to the power supply circuit and the cathode connected to the constant current circuit,
The disaster prevention lamp according to claim 3, wherein the control circuit cuts off the supply of power from the charging power source to the constant current circuit by lowering a voltage of the charging power source than the battery voltage. Lighting device.   The disaster-lamp lighting device according to any one of claims 1 to 4, further comprising a limiter circuit that maintains the voltage of the charging power source at or above the first voltage.   The disaster light lighting device according to claim 5, wherein the first voltage is a lowest voltage that is supplied with electric power from the charging power source and operates the control circuit.   The emergency light lighting device according to any one of claims 1 to 5, wherein the constant current circuit is a resistor.   8. The disaster prevention according to claim 7, wherein power is supplied to the control circuit from the battery when the battery voltage becomes lower than a second voltage in a state where power is supplied from the outside to the power supply circuit. 9. Lamp lighting device.   The disaster prevention lamp lighting device according to any one of claims 1 to 8, wherein the control circuit controls the voltage of the charging power source to be higher than the battery voltage by a certain voltage. The emergency light lighting device according to any one of claims 1 to 9,
The lamp;
A disaster light characterized by comprising.

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