KR200456022Y1 - Elevator car illumination device using solar cells - Google Patents

Abstract

There is provided a lighting power supply for continuously maintaining the lighting of the elevator car, a solar panel for generating electrical energy from sunlight, a charger for charging the electrical energy generated in the solar panel to the storage battery, electrical energy from the charger Battery powered by a switch, a switch mode power supply for generating a DC voltage from a commercial power supply, a power selector for selecting a power supply source between the battery and the switch mode power supply, and the power is supplied via the power selector to illuminate the elevator car Includes an elevator car lighting unit, wherein the power selector selects the switch mode power supply as the illumination power supply source of the elevator car when the voltage of the battery is lower than the first reference voltage, and the switch mode power supply Ellie If the voltage of the battery becomes higher than the second reference voltage while using it as an illumination power supply of a battery car, the power selector selects the battery as an illumination power supply of the elevator car, wherein the second reference voltage is the first voltage. Elevator car lighting apparatus using a solar cell, characterized in that higher than the reference voltage.

Solar cell, elevator car, lighting device

Description

Elevator car illumination device using solar cells

The present invention relates to an illumination device of an elevator car, and can realize eco-friendly and economical elevator car lighting by using energy using solar light, and sometimes an elevator car light operated by commercial power is turned off. It relates to an elevator car lighting device for at least a lighting inside the elevator is activated to protect the passengers until the power is restored.

In general, elevators are installed inside a high-rise building and are used as a convenient transportation device for vertically moving people or cargo. In general, the elevator is equipped with a drive motor, an inverter for controlling the drive motor and a PLC in the upper machine room of the building to move the elevator car up and down. The elevator drives the elevator car by installing a counter weight to reduce the driving power of the car and installs a safety device for falling on the lowest floor where the elevator car is operated for safety.

Increasing urbanization and land prices are fueling the trend of building high-rise buildings on limited grounds, and in fact the city's center and surrounding centers are also inevitable products of modernized cities. As well as commercial buildings, residential apartments are becoming larger and higher, and construction of 20 to 30-storey apartments is also active.

Although elevators provide speed and convenience in moving between floors in such high-rise buildings, it is a device that moves vertically in high-rise buildings, so it is necessary to pay special attention because it can cause serious injury if stability is not guaranteed. to be.

In particular, when the commercial power is turned off while the elevator is in operation, passengers who are isolated from the elevator feel uneasy about the danger of falling on the higher floor, but more seriously, the commercial vehicle is cut off and the lighting of the car is blocked due to the interruption of the commercial power. It causes agitation. In large buildings with alternative power sources, this lighting problem can also be solved, but otherwise, it is necessary to keep the elevator lights on with alternative power when the utility power is interrupted. .

In addition, if the alternative power source is economical and eco-friendly without using commercial power, even if it is not the driving power of an elevator car that consumes a lot of power, it may be possible to reduce the power cost by using an alternative power source at least as much as lighting of the elevator car.

It is possible to reduce the power cost by using eco-friendly and economical alternative power instead of commercial power. If commercial power is off, elevator operation is stopped and lighting is turned off, regardless of commercial power. There is a need for a device capable of keeping at least the lighting of the elevator on until commercial power is restored through alternative power sources.

In order to solve the above problems, a solar panel for generating electrical energy from sunlight, a charging controller for charging the electrical energy generated in the solar panel to the storage battery, a storage battery for charging the electrical energy from the charging controller, direct current from a commercial power source A switch mode power supply for generating a voltage, a power selector for selecting a power supply source from the storage battery and the switch mode power supply, and an elevator car lighting unit for illuminating the elevator car by receiving power through the power selector, The power selector selects the switch mode power supply as the illumination power supply of the elevator car when the voltage of the battery is lower than the first reference voltage, and uses the switch mode power supply as the illumination power supply source of the elevator car. The power selector selects the storage battery as an illumination power supply source of the elevator car when the voltage of the storage battery is higher than the second reference voltage, wherein the second reference voltage is higher than the first reference voltage. An elevator car lighting apparatus using a battery is provided.

In order to solve the above another problem, preferably, in the elevator car lighting apparatus using the solar cell, it is determined whether the commercial power is on or off, and the power selector causes the storage battery to be used when the commercial power is off. There is provided an elevator car lighting apparatus using a solar cell, characterized in that it further comprises a control unit for transmitting a signal for controlling to select as the illumination power supply source of the elevator car.

In order to solve the above further problem, preferably, the control unit selectively controls the power selector to select the commercial power as an illumination power supply source of the elevator car when the commercial power returns from the off state to the on state. An elevator car lighting apparatus using a solar cell, which transmits a signal, is provided.

The elevator car lighting device using the solar cell according to the present invention can supply power to the elevator car lighting with more economical and eco-friendly solar energy, and also, if necessary, the elevator car lighting is maintained even when the power is off. It will be able to maintain and eliminate the anxiety of the passengers in the stopped car.

Hereinafter, an elevator car lighting apparatus using a solar cell according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, if it is determined that the detailed description of the related known technology or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to a client's or operator's intention or custom. Therefore, the definition should be based on the contents throughout this specification. In addition, the connection between the first component and the second component may be directly connected to the first component and the second component, or may be connected through another component therebetween.

Like reference numerals in the drawings denote like elements.

1 is a block diagram of an elevator car lighting apparatus using a solar panel according to an embodiment of the present invention.

The lighting device 100 includes a solar panel 110, a charge controller 120, a storage battery 130, a commercial power supply 140, an SMPS 145, a power selector 150, and a controller 160. The lighting power of the car 170 is supplied.

First, the solar power supply unit 10 including the solar panel 110, the charge controller 120, and the storage battery 130 supplies alternative power through the storage battery using sunlight. Solar light is collected through the solar panel 110 and the charging controller 120 charges electrical energy from the solar panel 110 to the storage battery 130.

Control motors such as drive motors, inverters, PLCs, etc. to drive elevator cars are usually located on the roof of a building. Can be.

The power selector 150 may simply use a relay. The power selector 150 selects one of the storage battery 130 charged with electricity through sunlight and the SMPS 145 generating the DC power through the commercial power supply 140 according to the situation. Assuming that the elevator car uses a DC power source, one of the battery 130 and the SMPS 145 is selected.

As an example, when the lighting power source is alternating current, an inverter 135 may be used in the middle to generate the alternating current power from the storage battery 130 that stores electrical energy from sunlight. Of course, at this time, the SMPS 145 will not need since the AC power of the commercial power supply 140 can be used as it is. Hereinafter, when the power selector 150 selects the commercial power 140, the power selector 150 includes selecting the output of the SMPS 145 when the power required for illumination is a direct current. In this case, when the power selector selects the battery 130, the power selector includes the meaning of selecting the output of the inverter 135 through the battery 130.

As an embodiment according to the present invention, look at an example of using a commercial power source as an elevator car lighting power supply to switch the storage battery 130 by the solar power source in the event of an emergency.

At this time, the most problematic situation will be when the commercial power is off and the car stops. In many cases, the solar power capacity is insufficient to use the driving power of the elevator car by using sunlight, and if there is no single generator capable of driving the elevator, the car will stop when the commercial power is turned off and passengers may be uneasy. There will only be. Normally, in such a situation, the passengers' anxiety will be further amplified unless the interior lights are illuminated. To relieve passenger anxiety at least, it is desirable to allow lighting devices to be powered by alternative power sources.

At this time, according to the present invention, the control unit 160 monitors the output of the commercial power source 140 or SMPS 145 and detects when the output is turned off, and sends a control signal 165 to the power selector 150.

Upon receiving the control signal 165 indicating that the commercial power is cut off, the power selector 150 is switched to select the power generated from the battery 130. This selects solar energy as the lighting power supply source of the elevator car 170.

If the commercial power 140 is restored, the control unit 160 detects this again and sends a recovery control signal to the power selector 150, and the power selector 150 selects the commercial power as a power supply again.

As another embodiment according to the present invention, let's assume the usual use of economical and environmentally friendly solar energy as a lighting power source and commercial power when the solar energy is insufficient.

In this case, the power selector 150 selects the storage battery 130 as the lighting power supply. If the battery 130 continues to be used as a lighting power supply, the voltage of the battery 130 will drop. When the voltage of the battery drops below the first reference voltage 151, the power selector 150 uses the commercial power 140 as a power source without using the output of the battery 130 as a power source of the elevator car lighting.

When a predetermined time elapses while using the commercial power 140 as a power supply source, the charging voltage of the storage battery 130 will increase through the solar panel 110. If the power selector 150 selects the battery again because the battery is quickly charged and the voltage is increased, the power selector 150 quickly switches between the output of the battery 130 and the commercial power 140 for a short time. Will occur. To prevent this, hysteresis may be used by using the second reference voltage 153 when the battery 130 is switched back to a power supply source. That is, when the commercial battery 140 is used again and the voltage of the battery 130 is increased to switch the battery to a power source, the voltage of the battery 130 must be a second reference voltage slightly higher than the first reference voltage 151. The selector 150 allows the storage battery 130 to be selected.

FIG. 2 illustrates the power selector 150 in more circuit detail. That is, FIG. 2 is an embodiment of a circuit diagram in which an elevator using a solar panel according to the present invention selects a power supply source of a lighting device.

Referring to FIG. 2 together with FIG. 1, the power selector 150 may include operational amplifiers OP1 and 230 and a relay 220.
The operational amplifiers OP1 and 230 have a first input terminal, a second input terminal and an output terminal. The first input terminal may be an input terminal (−) of the operational amplifiers OP1 and 230, and the second input terminal may be an input terminal (+) of the operational amplifiers OP1 and 230. The operational amplifiers OP1 and 230 output a high level voltage, that is, V _DD through the output terminal when the voltage (+) applied to the second input terminal is greater than the voltage applied to the first input terminal (−). can do. On the contrary, the operational amplifiers OP1 and 230 have a low-level voltage, that is, a ground voltage through the output terminal when the voltage (+) applied to the second input terminal is smaller than the voltage applied to the first input terminal (−). You can output
A first voltage corresponding to the first reference voltage 151 may be applied to the first input terminal. As described above, when the voltage of the battery 130 is lower than the first reference voltage 151, the power selector 150 may select the SMPS 145 as a power supply source.
According to the embodiment illustrated in FIG. 2, the first resistor R1 may be connected between the SMPS 145 and the node A. FIG. Also, a zener diode ZD1 and a second resistor R3 may be connected between the node A and the ground, respectively, and a third resistor R3 may be connected between the first input terminal and the node A. FIG. Zener diode ZD1 may have an anode connected to ground and a cathode connected to node A. FIG. Accordingly, the zener diode ZD1 may function as a constant voltage source that outputs a breakdown voltage. The third resistor R3 is a resistor for protecting the operational amplifiers OP1 and 230 and may be omitted.
The voltage of the node A is kept the same as the breakdown voltage by the zener diode ZD1 and is applied to the first input terminal (−) through the third resistor R3. That is, the first voltage applied to the first input terminal may be the same as the breakdown voltage of the zener diode ZD1. However, when the commercial power supply 140 is out of power or the SMPS 145 is broken, the voltage of the node A drops to 0V.
According to another embodiment, the zener diode ZD1 may be omitted. In this case, the first voltage applied to the first input terminal (−) may be a voltage proportional to the output voltage of the SMPS 145. The first voltage may be determined by voltage division between the first resistor R1 and the second resistor R2. In general, since the SMPS 145 outputs a constant voltage, the first voltage applied to the first input terminal (−) will be constant.
In the embodiment shown in FIG. 2, the zener diode ZD1 is directly connected between the node A and the ground, thereby making the first voltage applied to the first input terminal − more constant.
Again, according to the embodiment shown in FIG. 2, the fourth resistor R4 is connected between the battery 130 and the node B, and the fifth resistor R5 is connected between the node B and the ground. The sixth resistor R6 may be connected between the node B and the second input terminal +. The sixth resistor R6 is a resistor for protecting the operational amplifiers OP1 and 230 and may be omitted.
The seventh resistor R7 and the diode D2 may be connected in series between the second input terminal (+) and the output terminal. The diode D2 may have a positive electrode connected to the second input terminal (+) side and a negative electrode connected to the output terminal side. However, in another example, if the outputs of the operational amplifiers OP1 and 230 are inverted, the diode D2 may also be connected to the other side.
When the outputs of the operational amplifiers OP1 and 230 are at a high level, the diode D2 may be open. As a result, a voltage proportional to the voltage of the storage battery 130 is applied to the node B, that is, a voltage according to the voltage distribution of the fourth resistor R4 and the fifth resistor R5. The voltage of the node B is applied to the second input terminal + through the sixth resistor R6. That is, the second voltage applied to the second input terminal + may be a battery voltage × {R 5 / (R 4 + R 5)}. Here, R5 / (R4 + R5) may be referred to as r1.
However, when the output of the operational amplifiers OP1 and 230 is at a low level, the diode D2 may be shorted. At this time, the cathode of the diode D2 may be the same as that connected to the ground. When the threshold voltage of the diode D2 is ignored, the voltage applied to the node B may be determined by the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7. Can be. For example, the voltage V _B applied to the node B may be as follows.
Voltage (V _B ) = battery voltage × {(R5 ^-1 + (R6 + R7) ^-1 ) ^-1 / (R4 + (R5 ^-1 + (R6 + R7) ^-1 ) ^-1 )}
In addition, the second voltage applied to the second input terminal (+) may be determined by the voltage distribution of the sixth resistor R6 and the seventh resistor R7. That is, the second voltage may be as follows.
Second voltage = V _B × {R7 / (R6 + R7)}
= Battery voltage × {(R5 ^-1 + (R6 + R7) ^-1 ) ^-1 / (R4 + (R5 ^-1 + (R6 + R7) ^-1 ) ^-1 )} × {R7 / (R6 + R7)}
At this time, {(R5 ⁻¹ + (R6 + R7) ⁻¹ ) ⁻¹ / (R4 + (R5 ⁻¹ + (R6 + R7) ⁻¹ ) ⁻¹ )} × {R7 / (R6 + R7)} may be referred to as r2.
The second voltage when the outputs of the operational amplifiers OP1 and 230 are at a high level is greater than the second voltage when the outputs of the operational amplifiers OP1 and 230 are at a low level. If the output of the operational amplifiers OP1 and 230 is at the high level, the equivalent resistance of the node B is the fifth resistor R5, but if the output of the operational amplifiers OP1 and 230 is at the low level, the node ( The equivalent resistance of B) is because the fifth resistor R5 and the sixth resistor R6 + the seventh resistor R7 are connected in parallel to be smaller than the fifth resistor R5. In addition, when the outputs of the operational amplifiers OP1 and 230 are at a low level, the voltage of the node B is divided by the sixth resistor R6 and the seventh resistor R7.
Thus, r1 is greater than r2. Also, r1 and r2 are both greater than 0 and less than 1. However, if there is no fourth resistor R4, r1 may be one.
Referring to the operation of the relay 220 according to the embodiment shown in FIG. 2, when the output of the operational amplifiers OP1 and 230 is at a high level, the transistor Q1 is connected to a source and a drain, and thus the relay 220 is connected. Current may flow in the Accordingly, the relay 220 may be switched to the storage battery 130. However, when the outputs of the operational amplifiers OP1 and 230 are at the low level, the transistor Q2 is shorted so that no current can flow through the relay 220. In this case, the relay 220 may be switched to the SMPS 145.
In the following, it is assumed that the first reference voltage 151 is 24V and the second reference voltage 153 is 26V.
In addition, the breakdown voltage of the zener diode ZD1 is 2.4V, the first resistor R1 and the fourth resistor R4 are both 9 kV, and the second resistor R2 and the fifth resistor R5 are 1 kV. It is assumed that the seventh resistor R7 is 12 kΩ. In addition, for convenience of calculation, it is assumed that there is no third resistor R3 and sixth resistor R6. The voltage of the battery is indicated by V _C.
The voltage of the node A is equal to the first voltage V1 applied to the first input terminal (−). Therefore, when the SMPS 145 is in operation, the first voltage V1 is 2.4V according to the breakdown voltage of the zener diode ZD1.
When the outputs of the operational amplifiers OP1 and 230 are at a high level, that is, when the second voltage V2 applied to the second input terminal + is greater than the first voltage V1, the voltage of the node B. Is equal to the second voltage V2 applied to the second input terminal (+). Therefore, according to the above formula, the second voltage V2 is equal to Vc / 10. That is, r1 is 0.1.
Therefore, when the battery voltage Vc is higher than 24V, the operational amplifiers OP1 and 230 output a high level voltage. In this case, the transistor Q1 is turned on, so that a current flows in the relay 220, and the relay 220 selects the storage battery 130 as a power supply source.
On the contrary, when the battery voltage Vc is lower than 24V, the operational amplifiers OP1 and 230 output a low level voltage. In this case, the transistor Q1 is turned off so that no current flows in the relay 220, and thus the relay 220 selects the SMPS 145 as a power supply source.
However, even if the battery voltage Vc is higher than 24V, the operational amplifiers OP1 and 230 do not output a high level voltage. The reason is the seventh resistor R7 and the diode D2.
When the operational amplifiers OP1 and 230 output a low-level voltage, the voltage of the node B assumes that the sixth resistor R6 is 0, so that the second voltage applied to the second input terminal (+). Same as (V2). In addition, the equivalent resistance between the node B and the ground is a resistor in which the fifth resistor R5 and the seventh resistor R7 are connected in parallel. In other words, the equivalent resistance between the node B and ground is (1 k? X12 k?) / (1 k? +12 k?), That is, (12/13) k ?. Therefore, the second voltage V2 is Vc × (12/13) / (9 + 12/13), and when 9 + 12/13 is about 10, V2 is about Vc × (12/130). At this time, r2 is 12/130.
Therefore, when the battery voltage Vc must be higher than 26V, the second voltage V2 becomes larger than 2.4V. Accordingly, the operational amplifiers OP1 and 230 output a high level voltage.
At this time, referring to the relationship between the first reference voltage 151 and the second reference voltage 153, when the operational amplifiers OP1 and 230 output the low level voltage, the battery voltage Vc is the first. When it is lower than the reference voltage. From the perspective of the operational amplifiers OP1 and 230, this moment is when the second voltage V2, i.e., r1 x Vc, is lower than the first voltage V1, wherein the battery voltage Vc is the first reference. Will be the same as the voltage. Therefore, the first voltage V1 will be equal to the voltage obtained by r1 times the first reference voltage. That is, the first reference voltage may be determined based on the breakdown voltage of the zener diode ZD1 and the ratio of the first resistor R1 and the second resistor R2.
In addition, when the operational amplifiers OP1 and 230 output the high level voltage, the battery voltage Vc is lower than the second reference voltage. From the perspective of the operational amplifiers OP1, 230, this moment is when the second voltage V2, that is, r2 × Vc is higher than the first voltage V1, wherein the battery voltage Vc is the second voltage. Will be the same as the reference voltage. Therefore, the first voltage V1 will be equal to the voltage obtained by r2 times the second reference voltage.
Since the first voltage V1 is constant regardless of the outputs of the operational amplifiers OP1 and 230, the voltage obtained by r1 times the first reference voltage and r2 times the second reference voltage is the same. Therefore, the second reference voltage is equal to the voltage obtained by multiplying the first reference voltage by (r1 / r2). In addition, the second reference voltage may be determined by the combination of the fourth to seventh resistors R4-R7.

Without the seventh resistor R7 and the diode D2, as the battery voltage Vc is lower than 24V, the operational amplifiers OP1 and 230 may output a low level voltage. Then, the battery voltage Vc is charged and becomes higher than 24V. Accordingly, the operational amplifiers OP1 and 230 alternately output the high level voltage and the low level voltage very frequently. Therefore, a mechanical burden is given to the relay 220, and frequent switching may cause a problem in stable power supply.

However, according to the present invention, when the battery voltage (Vc) is lower than 24V, when the SMPS 145 is selected as a power source, the SMPS (145) is turned on until the battery voltage (Vc) is higher than 26V, not higher than 24V. It will continue to be used as a power source. Therefore, the relay 220 can stably switch between the battery 130 and the SMPS 210 without repeating switching for a short time. In addition, while comparing the battery voltage Vc with a plurality of reference voltages such as the first reference voltage and the second reference voltage according to circumstances, only one operational amplifier is used. Therefore, the circuit configuration can be simplified, and the manufacturing cost can be reduced.

As described above, the present invention has been described based on the preferred embodiments, but these embodiments are intended to illustrate rather than limit the present invention, so that those skilled in the art belong to the present invention without departing from the technical spirit of the present invention. Various changes, modifications or adjustments to the example will be possible. Therefore, the protection scope of the present invention will be limited only by the appended claims and should be construed as including all changes, modifications or adjustments.

1 is a block diagram of an elevator car lighting apparatus using a solar panel according to the present invention.

2 is an embodiment of a circuit diagram for selecting a power supply source of an elevator car lighting apparatus using a solar panel according to the present invention.

Claims (5)

Solar panel for generating electrical energy from sunlight; A charging controller for charging the electrical energy generated by the solar panel to the storage battery; A storage battery in which electrical energy is charged from the charging controller; A switch mode power supply generating a voltage converted from a commercial power source; A power selector for selecting one of the storage battery and the switch mode power supply as a power source; And And a lighting unit using the switch mode power supply or the storage battery as the power supply source via the power selector. The power selector selects the switch mode power supply as the power supply when the voltage of the battery is lower than the first reference voltage, and the voltage of the battery is increased while the switch mode power supply is used as the power supply. When the reference voltage is higher than the power selector selects the storage battery as the power supply source, The power selector includes an operational amplifier having a first input terminal, a second input terminal, and an output terminal, wherein a first voltage corresponding to the first reference voltage is applied to the first input terminal, and the second input is performed. A second voltage corresponding to the voltage of the storage battery is applied to the terminal, and a first output voltage or a second output voltage is output through the output terminal according to a result of comparing the magnitude of the first voltage and the second voltage. When the first output voltage is output through the output terminal of the operational amplifier, the second voltage is a voltage of r1 times the voltage of the storage battery, When the second output voltage is output through the output terminal of the operational amplifier, the second voltage is a voltage of r2 times the voltage of the storage battery, R1 and r2 satisfy a relationship of 0 <r2 <r1 ≤ 1, wherein the second reference voltage is a voltage obtained by multiplying the first reference voltage by (r1 / r2), and the first voltage corresponds to the first reference voltage. Lighting device using a solar cell, characterized in that the voltage r1 times. The method according to claim 1, The power selector further includes a diode connected between the second input terminal and the output terminal of the operational amplifier, The diode is a short circuit when one of the first output voltage and the second output voltage is output through the output terminal, the lighting device using a solar cell, characterized in that open when the other output. The method according to claim 1, The power selector further includes a zener diode connected between the first input terminal and ground, And the zener diode provides the first voltage to the first input terminal constantly when the voltage of the switch mode power supply is greater than the first voltage. The method according to claim 1, The power selector, A first resistor coupled between the switch mode power supply and a first node; A second resistor coupled between the first node and ground; A third resistor coupled between the first node and a first input terminal of the operational amplifier; A zener diode connected between the first node and ground; A fourth resistor connected between the storage battery and a second node; A fifth resistor connected between the second node and ground; A sixth resistor connected between the second node and a second input terminal of the operational amplifier; A seventh resistor and a diode connected in series between the second input terminal of the operational amplifier and the output terminal of the operational amplifier; A transistor having a gate to which a voltage output through the output terminal of the operational amplifier is applied; And Lighting device using a solar cell comprising a relay that is switched according to the current flowing between the source and the drain of the transistor. The method according to claim 1, And a controller for determining whether the commercial power is on / off and transmitting a signal for controlling the power selector to select the storage battery as the lighting power supply when the commercial power is off. And the control unit selectively transmits a signal for controlling the power selector to select the commercial power as the lighting power supply when the commercial power returns from the off state to the on state.

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