Lighting device

Abstract

We provide a lighting device that is compatible with multiple in-vehicle batteries with different voltages. [Solution] The lighting device of the present invention includes batteries 30, 35 and a power supply circuit 20, the power supply circuit 20 having an LED light-emitting unit 40, a voltage monitoring circuit 42 and a switch switching control circuit 45, the LED light-emitting unit 40 comprising a plurality of LEDs 60-63, current limiting circuits 50, 51 and a plurality of switch units 70, 80, the voltage monitoring circuit 42 monitors the voltage of batteries 30, 35 and confirms the voltage value of batteries 30, 35 and transmits a control signal to the switch switching control circuit 45, the switch switching control circuit 45 receives the control signal output from the voltage monitoring circuit and simultaneously transmits operation signals to the plurality of switch units 70, 80 of the LED light-emitting unit 40, the switch units 70, 80 switch the output system upon input of the operation signals.

Description

Technical Field

[0001] The present invention relates to a lighting device.

Background Art

[0002] Conventionally, the lighting device used in a vehicle is kept in a lighting state by power supply from a battery mounted on the vehicle or the like.

[0003] The in-vehicle LED lighting device of Patent Document 1 can stably illuminate the interior of a vehicle by replacing the fluorescent lamp of a lighting device provided in a box-shaped cargo compartment of a vehicle such as a truck with an LED, and can prevent the LED from being damaged by an off-specification DC voltage value from a battery. However, it cannot switch the DC current value corresponding to a plurality of batteries having different power supply voltages, and cannot cope with a plurality of batteries having different power supply voltages.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, an object of the present invention is to provide a lighting device that can immediately use a plurality of types of batteries by using a power supply circuit corresponding to a battery having a plurality of voltage specifications as a lighting fixture used inside a vehicle such as a driver's seat and a luggage compartment of a vehicle.

Means for Solving the Problems

[0006] To achieve the above object, the lighting device of the present invention includes a battery and a power supply circuit, the power supply circuit has an LED light emitting unit, a voltage monitoring circuit, and a switch switching control circuit, The LED light-emitting section comprises multiple LEDs, a current limiting circuit, and multiple switch sections. The voltage monitoring circuit monitors the battery voltage, confirms the battery voltage value, and transmits a control signal to the switch switching control circuit. The switch switching control circuit receives a control signal output from the voltage monitoring circuit and simultaneously transmits operation signals to multiple switch units of the LED light-emitting section. The switch unit switches the output system based on the input of the operation signal. It is characterized by the following: [Effects of the Invention]

[0007] According to the present invention, by using lighting fixtures that are compatible with batteries of multiple voltage standards as lighting fixtures used in the interior of vehicles such as trucks, such as the driver's seat and cargo compartment, it is possible to provide a lighting device that is compatible with multiple power sources such as batteries. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic cross-sectional view showing the lighting fixtures in the vehicle in the embodiment. [Figure 2] Figure 2 is a circuit diagram showing the configuration of the power supply circuit in the embodiment. [Figure 3] Figure 3 is a circuit diagram showing the configuration of the power supply circuit in the embodiment. [Figure 4] Figure 4 is a block diagram showing the operation flow of the power supply circuit in the embodiment. [Modes for carrying out the invention]

[0009] To facilitate understanding of the present invention, an example of a lighting device according to an embodiment of the present invention will be described with reference to the drawings.

[0010] The embodiments described below are merely examples illustrating specific cases of the present invention. Therefore, the arrangement, function, and numerical values ​​of the components described in these embodiments are merely examples and should not be interpreted as limiting the scope of the present invention. In addition, components such as wiring, screws, and connectors are generally omitted from the drawings. [Examples]

[0011] Figure 1 is a schematic cross-sectional view showing the lighting fixtures 6a and 6b in the embodiment installed in the vehicle 1.

[0012] As shown in Figure 1, vehicle 1 has a lighting fixture 6a installed on the ceiling inside the driver's seat 2, and a lighting fixture 6b installed on the ceiling inside the luggage compartment 3 behind the driver's seat 2. Lighting fixtures 6a and 6b brightly illuminate the interior of the driver's seat 2 and the luggage compartment 3, respectively. The lighting fixtures 6a and 6b installed in vehicle 1 are not limited to these, and may be installed in appropriate locations within vehicle 1 where lighting is needed.

[0013] The lighting devices referred to in this invention include lighting devices installed in the interiors of cargo vehicles such as trucks, buses, special vehicles, and ordinary passenger cars, as well as in the cargo beds of cargo vehicles and the refrigerated compartments of refrigerated vehicles.

[0014] Figure 2 is a circuit diagram showing the configuration of the power supply circuit 20 in Embodiment 1. The power supply circuit 20 includes a battery 30, an LED light-emitting unit 40, a voltage monitoring circuit 42, a switch switching control circuit 45, and wiring that electrically connects each component.

[0015] In Figure 2, the battery 30 is an in-vehicle DC power supply that outputs 12V. The voltage monitoring circuit 42, which is connected to the LED light-emitting unit 40 through a wire (output line O), is a circuit that monitors the output voltage of the battery 30. The voltage monitoring circuit 42 is electrically connected to the LED light-emitting unit 40 through a switch switching control circuit 45. The LED light-emitting unit 40 contains two current limiting circuits 50, 51, four LEDs 60-63, a first switch unit 70 and a second switch unit 80, and is connected to the battery 30 through a wire (ground line G).

[0016] The first switch unit 70 and the second switch unit 80 are members having the same configuration. The first switch unit 70 includes a switch plate 72 that selectively contacts and electrically conducts with a support shaft 74 at one end and a terminal 75 or a terminal 76 at the other end. Similarly, the second switch unit 80 includes a switch plate 82 that selectively contacts and electrically conducts with a support shaft 84 at one end and a terminal 85 or a terminal 86 at the other end.

[0017] The signal input from the switch switching control circuit 45 to the LED light emitting unit 40 branches into two, one input to the first switch unit 70 and the other input to the second switch unit 80. According to the input signal, the switch plate 72 in the first switch unit 70 rotates around the support shaft 74 and contacts the terminal 75. Similarly, according to the input signal, the switch plate 82 in the second switch unit 80 rotates around the support shaft 84 and contacts the terminal 85 to conduct. By performing the above operations, the LED light emitting unit 40 becomes capable of corresponding to a 12V battery.

[0018] The first switch unit 70 and the second switch unit 80 are mechanical switches such as switches and relays, and switching elements, and a switching switch composed of a FET, a transistor, an analog switch, etc. may be used, but it is not limited thereto. Further, for the voltage monitoring circuit 42, elements such as a microcomputer, a comparator, a logic IC, etc. that can monitor the state and output a signal are used, but it is not limited to these.

[0019] The current limiting circuits 50 and 51 are circuits that limit the current output from the battery 30 so that the LEDs 60 - 63 operate properly. The LED light emitting unit 40 represents, for example, the lighting fixture 6a in FIG. 1, and for the lighting fixture 6b, it is placed in parallel between the output line O and the ground line G. Similarly hereinafter, the lighting fixtures 6a, 6b ··· are added as necessary.

[0020] (Modified Example) Figure 3 is a circuit diagram showing the configuration of the power supply circuit 20 in a modified example. The power supply circuit 20 includes a battery 35, an LED light-emitting unit 40, a voltage monitoring circuit 42, a switch switching control circuit 45, and wiring to electrically connect each component. Except that the battery 35 is a 24V DC power supply for vehicles, the other configurations are the same as in the embodiment shown in Figure 2.

[0021] When the voltage monitoring circuit 42 detects that the battery 35 is 24V, the signal input from the switch switching control circuit 45 to the LED light-emitting unit 40 is split into two, one input to the first switch unit 70 and the other to the second switch unit 80. The switch plate 72 in the first switch unit 70 rotates around the pivot shaft 74 and makes contact with the terminal 76. Similarly, in response to the input signal, the switch plate 82 in the second switch unit 80 rotates around the pivot shaft 84 and makes contact with the terminal 86, creating electrical conductivity. Through the above operation, the LED light-emitting unit 40 becomes capable of handling a 24V battery.

[0022] Figure 4 is a block diagram showing the operation flow of the power supply circuit 20 in the embodiment. (1) Power on. (2) The voltage monitoring circuit 42 detects a power supply voltage of 12V or 24V. (3) In the switch switching control circuit 45, When using battery 30 (12V power supply), the LEDs 60-63 are configured in a 2 series / 2 parallel configuration. When using battery 35 (24V power supply), the LEDs 60-63 are configured in a 4 series / 1 parallel configuration. The first switch unit 70 and the second switch unit 80 are switched accordingly, and the LED light-emitting unit 40 becomes compatible with either 12V or 24V, respectively. (4) As a result of the above operation, LEDs 60-63 are lit under optimal conditions.

[0023] Thus, the present invention provides lighting fixtures for use in the driver's seat, cargo compartment, and other interior spaces of vehicles such as trucks, which can accommodate multiple types of batteries with different voltages and illuminate under optimal conditions by adopting a simple circuit configuration without requiring separate dedicated circuits for batteries with multiple voltage standards.

[0024] Furthermore, the LEDs can be lit using optimal series and parallel connections, and because there are no dedicated 12V or 24V lines, the exceptional benefit of eliminating the possibility of malfunctions due to incorrect connections is achieved. Note that the battery is not limited to 12V or 24V, and may have other voltages.

[0025] Furthermore, this invention is not limited to the above embodiments, and various modifications and applications are possible with respect to the above embodiments. [Industrial applicability]

[0026] According to the present invention, by using LEDs or other lighting fixtures that are compatible with batteries of multiple voltage standards as lighting fixtures used in the interior of vehicles such as trucks, such as the driver's seat and cargo compartment, it is possible to provide a lighting device that is compatible with multiple power sources such as batteries. [Explanation of symbols]

[0027] 1·············Vehicle 2·············Driver's seat 3·············Luggage compartment 6a,6b...Lighting equipment 20································Power circuit 30·············12V battery 35·············24V battery 40············LED light-emitting part 42············Voltage monitoring circuit 45···········Switch switching control circuit 50, 51·········Current limiting circuit 60, 61, 62, 63... LED 70············First Switch Section 80············Second switch section 72, 82·········Switchboard 74,84·························· Support shaft 75, 76, 85, 86... terminals Output line of O· G·············Ground Line

Claims

1. Includes battery and power circuit, The power supply circuit includes an LED light-emitting section, a voltage monitoring circuit, and a switch switching control circuit. The LED light-emitting section comprises multiple LEDs, a current limiting circuit, and multiple switch sections. The voltage monitoring circuit monitors the battery voltage, confirms the battery voltage value, and transmits a control signal to the switch switching control circuit. The switch switching control circuit receives a control signal output from the voltage monitoring circuit and simultaneously transmits operation signals to multiple switch units of the LED light-emitting section. The switch unit switches the output system based on the input of the operation signal. A lighting device characterized by the following features.

2. The aforementioned battery is connected to the LED light-emitting unit through an output line and a ground line. The lighting device according to claim 1, wherein the voltage monitoring circuit is connected to the output line and monitors the voltage of the output line.

3. The lighting device according to claim 1, wherein the switch section comprises a plurality of switching elements, and the plurality of switching elements operate simultaneously upon input of a control signal output from the switch switching control circuit.

4. The aforementioned switch section consists of a first switch section and a second switch section. The lighting device according to claim 3, wherein the signal input from the switch switching control circuit to the LED light-emitting unit is split into two, one input to the first switch unit and the other to the second switch unit, and the output systems of the first switch unit and the second switch unit are switched according to the input signal.

5. The lighting device according to claim 1, wherein the battery is an in-vehicle DC power supply that outputs 12V or 24V and supplies power to a plurality of LEDs arranged in the LED light-emitting section.

6. The lighting device according to claim 5, wherein the plurality of LEDs arranged in the LED light-emitting section are connected in parallel when the battery outputs 12V and in series when it outputs 24V.

7. The lighting device according to claim 1, wherein the current limiting circuit is controlled to limit overcurrent and output a predetermined current to the LED.

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