WO2020175072A1

WO2020175072A1 - Lighting device, lighting unit, vehicle, control method, and control device

Info

Publication number: WO2020175072A1
Application number: PCT/JP2020/004472
Authority: WO
Inventors: 神原　隆; 義之稲田; 淑也森脇; 雅彦小井関
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2019-02-28
Filing date: 2020-02-06
Publication date: 2020-09-03
Also published as: JP7199042B2; JPWO2020175072A1

Abstract

The present disclosure addresses the problem of suppressing the flow of overcurrent into a light source unit. A lighting device (1) comprises: a power conversion unit (3); a bypass switch (Q1); a switch control unit (42); and a power control unit (41). The power conversion unit (3) supplies power to a light source unit (10). The bypass switch (Q1) is electrically connected in parallel to a second light source unit (22). In the case that the state of the second light source unit (22) is to be switched from a connected state to a short-circuit state, the power control unit (41) has a function to switch the size of the output current (I1) after the switch control unit (42) has controlled the bypass switch (Q1) to switch the second light source unit (22) from the connected state to the short-circuit state. The connected state is a state in which the second light source unit (22) is electrically connected to the first light source unit (21), and the short-circuit state is a state in which the second light source unit (22) is electrically short circuited.

Description

\¥0 2020/175072 1 卩 (: 17 2020 /004472 Clarification

Title of invention: Lighting device, lamp, vehicle, control method, and control device Technical field

[0001] The present disclosure generally relates to a lighting device, a lamp, a vehicle, a control method, and a control device. More specifically, the present disclosure relates to a lighting device that lights a plurality of light source units, a lighting device that includes a lighting device, a vehicle that includes the lighting device, a control method that controls lighting of the plurality of light source units, and a plurality of light source units. The present invention relates to a control device that controls the lighting of the.

Background technology

[0002] Conventionally, a lighting circuit for lighting a mouth beam light and a high beam light connected in series has been disclosed (for example, see Patent Document 1).

In the lighting circuit (lighting device) of Patent Document 1, a plurality of light source blocks (light source units) are connected in series to a power source. Then, the lighting circuit of Patent Document 1 short-circuits a part of the plurality of light source blocks and, at the same time, adjusts the power supplied from the power source according to the number of remaining light source blocks.

By the way, in recent years, a function of switching a current value of an output current to a light source unit which is not short-circuited is required in accordance with a combination of light source units which are not short-circuited among a plurality of light source units. For example, output can be output when all of the multiple light source units are connected (when all of the multiple light source units are not short-circuited) and when at least one of the multiple light source units is short-circuited. It is required to switch the current value of the current. As an example, in a state where at least one of the plurality of light source units is short-circuited, it is required to make the current value of the output current larger than that in a state where all of the plurality of light source units are connected.

However, in the conventional lighting device described in Patent Document 1, when the state of at least one of the plurality of light source units is switched from the connected state to the short-circuited state, the connected state is changed to the short-circuited state. There was an overcurrent in the light source that was switched to. The connected state is a state in which the light source unit is electrically connected to another light source unit and an output current flows through the light source unit. When the light source is 〇 2020/175072 2 卩 (：171? 2020 /004472

It is in a state of being electrically short-circuited.

[0006] More specifically, in the conventional lighting device described in Patent Document 1, the timing of switching the state of the light source unit from the connected state to the short-circuited state and the timing of changing the output current output from the lighting device are deviated. There were cases. In this case, when switching the state of the light source unit from the connected state to the short-circuited state, an overcurrent larger than the current value allowed for the light source unit may flow to the light source unit. was there. For example, the current value of the output current output from the lighting device is made larger than the current value allowed for the light source unit before the timing of switching the state of the light source unit from the connected state to the short-circuited state. In this case, an overcurrent larger than the current value allowed for the light source section flows into the light source section.

Prior art documents

Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 20 08 _ 1 2 6 9 5 8 Summary of Invention

[0008] The present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a lighting device, a lighting fixture, a vehicle, a control method, and a control device capable of suppressing an overcurrent from flowing to a light source unit. To do.

A lighting device according to an aspect of the present disclosure includes: a power converter, a bypass switch, a switch controller, and a power controller. The power conversion unit outputs an output current to a light source unit including a first light source unit and a second light source unit electrically connected to each other in series to supply power. The bypass switch is electrically connected in parallel to the second light source unit. The switch control unit controls the bypass switch. The power control unit controls the power conversion unit. The power conversion unit switches the magnitude of the output current according to the on/off state of the bypass switch and supplies power to the light source unit. When the state of the second light source unit is switched from the connected state to the short-circuited state, the power control unit controls the bypass switch to control the second light source unit by the switch control unit. 〇 2020/175072 3 卩 (: 171-1? 2020 /004472

It has a function of switching the magnitude of the output current after switching from the connected state to the short-circuited state. The connection state is a state in which the second light source unit is electrically connected to the first light source unit and the output current flows through the second light source unit. The short-circuited state is a state in which the second light source unit is electrically short-circuited.

[0010]A lamp according to an aspect of the present disclosure includes the lighting device, the first light source unit, the second light source unit, and a housing. The housing accommodates the first light source unit and the second light source unit.

[001 1] A vehicle according to an aspect of the present disclosure includes the lamp and a vehicle body. The vehicle body is equipped with the lamp.

A control method according to an aspect of the present disclosure is a control method for controlling a power conversion unit and a bypass switch. The power converter outputs an output current to a light source unit including a first light source unit and a second light source unit electrically connected to each other in series to supply power. The bypass switch is electrically connected in parallel to the second light source unit. In the control method, when the state of the second light source unit is switched from the connected state to the short-circuited state, after controlling the bypass switch to switch the second light source unit from the connected state to the short-circuited state, There is a step of switching the magnitude of the output current. The connection state is a state in which the second light source unit is electrically connected to the first light source unit and the output current flows through the second light source unit. The short-circuited state is a state in which the second light source unit is electrically short-circuited. In the control method, when the second light source unit is switched from the short-circuited state to the connection state, before controlling the bypass switch to switch the second light source unit from the short-circuited state to the connection state, There is a step of switching the magnitude of the output current.

A control device according to an aspect of the present disclosure is a control device that controls a power conversion unit and a bypass switch. The power converter outputs an output current to a light source unit including a first light source unit and a second light source unit electrically connected to each other in series to supply power. The bypass switch is electrically connected in parallel to the second light source unit. The control device includes a switch control unit and a power control unit. 〇 2020/175072 4 卩 (：171? 2020 /004472

The switch control unit controls the bypass switch. The power control unit controls the power conversion unit. When the state of the second light source unit is switched from the connected state to the short-circuited state, the power control unit controls the bypass switch to control the second light source unit from the connected state to the short-circuited state. After switching to, it has a function of switching the magnitude of the output current. The connection state described above is a state in which the second light source unit is electrically connected to the first light source unit and the output current flows through the second light source unit. The short-circuited state is a state in which the second light source unit is electrically short-circuited. When the second light source unit is switched from the short-circuited state to the connected state, the controller controls the switch switch to control the bypass switch so that the second light source unit is connected from the short-circuited state to the connected state. It has a function of switching the magnitude of the output current before switching to.

Brief description of the drawings

[0014] [Fig. 1] Fig. 1 is a block diagram of a lighting device according to the first embodiment.

[Fig. 2] Fig. 2 is a schematic configuration diagram of a lamp including the above-described lighting device.

[Fig. 3] Fig. 3 is a schematic configuration diagram of a vehicle in which the above lighting device is mounted.

[Fig. 4] Fig. 4 is a flow chart showing the operation of the above lighting device.

[Fig. 5] Fig. 5 is a flow chart showing the operation of the above lighting device.

[Fig. 6] Fig. 6 is a diagram for explaining the operation of the above lighting device.

[FIG. 7] FIG. 7 is an explanatory diagram of an operation of the above lighting device.

[FIG. 8] FIG. 8 is a diagram for explaining the operation of the above lighting device.

[FIG. 9] FIG. 9 is a diagram for explaining the operation of the above lighting device.

[FIG. 10] FIG. 10 is a flow chart showing the operation of the lighting device according to the second embodiment.

[Fig. 11] Fig. 11 is an explanatory diagram of the operation of the above lighting device.

[FIG. 12] FIG. 12 is a diagram for explaining the operation of the above lighting device.

[FIG. 13] FIG. 13 is an explanatory diagram of the operation of the above lighting device.

[FIG. 14] FIG. 14 is a diagram for explaining the operation of the above lighting device. [FIG. 15] FIG. 15 is a flow chart showing the operation of the lighting device according to the third embodiment.

[Fig. 16] Fig. 16 is a diagram for explaining the operation of the above lighting device.

[FIG. 17] FIG. 17 is an explanatory diagram of an operation of the above lighting device.

[FIG. 18] FIG. 18 is an explanatory diagram of an operation of the above lighting device.

[Fig. 19] Fig. 19 is a diagram for explaining the operation of the above lighting device.

[FIG. 20] FIG. 20 is a block diagram of a lighting device according to a fourth embodiment.

[FIG. 21] FIG. 21 is a block diagram of a lighting device according to a fifth embodiment.

[FIG. 22] FIG. 22 is an operation explanatory diagram of the above lighting device.

[FIG. 23] FIG. 23 is an operation explanatory view of a lighting device according to a modification of the first embodiment. [FIG. 24] FIG. 24 is a block diagram of a lighting device according to another modification of the first embodiment.

[FIG. 25] FIG. 25 is a diagram for explaining the operation of the above lighting device.

MODE FOR CARRYING OUT THE INVENTION

[001 5] The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Other than this embodiment and modifications, various modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present disclosure.

[0016] (Embodiment 1)

(1) Composition

The lighting device 1 of the present embodiment will be described with reference to FIGS. 1 to 3.

[0017] The lighting device 1 of the present embodiment is used for a lamp 100 (see Fig. 2) which is a headlamp device mounted on a vehicle 200 such as an automobile (see Fig. 3). As shown in FIGS. 1 to 3, the lighting device 1 lights the first light source unit 21 and the second light source unit 22 as a plurality of light source units 2. The first light source unit 21 is used as a passing (for mouth-beam) headlight, and the second light source unit 22 is used as a traveling (for high beam) headlight. The first light source section 21 is composed of a plurality of LEDs (light emitting diodes) connected in series. The second light source unit 22 is connected in series. 〇 2020/175072 6 卩 (：171? 2020 /004472

It is composed of multiple 1__ 0. The first light source unit 21 may have a configuration in which two or more series circuits are connected in parallel. Each series circuit in the first light source unit 2 1 is composed of a plurality of! The second light source unit 22 may have a configuration in which a plurality of series circuits of !_ 0 are connected in parallel. Each series circuit in the second light source unit 22 is composed of a plurality of! The number of !_Semi 0s included in the first light source unit 21 and the number of !_Semi 0s included in the second light source unit 22 may be different from each other or may be the same.

[0018] As shown in Fig. 1, the lighting device 1 includes a first input terminal 11 and a second input terminal.

1 2 and 1st output terminal 21 to 3rd output terminal 23. The “terminal” here does not have to be a component (terminal) for connecting an electric wire or the like, and may be, for example, a lead of an electronic component or a part of a conductor included in a circuit board. ..

[0019] The first input terminal 11 and the second input terminal 12 are electrically connected to both ends of the DC power supply source 1. Specifically, the first input terminal 11 is electrically connected to the positive electrode of the direct-current power supply 1 and the second input terminal 12 is electrically connected to the negative electrode of the direct-current power supply 1. DC power source 1 is a battery mounted on a vehicle 200 (see Fig. 3).

[0020] The first output terminal 21 to the third output terminal 23 are electrically connected to the first light source section 21 and the second light source section 22. Specifically, a series circuit of the first light source unit 21 and the second light source unit 22 is electrically connected between the first output terminal 21 and the second output terminal 22. The third output terminal 23 is electrically connected to the connection point between the first light source unit 21 and the second light source unit 22. That is, the first light source unit 21 is electrically connected between the first output terminal 21 and the third output terminal 23, and the third output terminal 23 and the second output terminal 22 are connected. The second light source unit 22 is electrically connected between them.

[0021] The lighting device 1 includes a power conversion unit 3, a bypass switch 0 1, a control unit 4 (control device), and a smoothing capacitor <3 1. The lighting device 1 has a first capacitor 〇 2 1 and a second capacitor 〇 2 2 as multiple capacitors 〇 2. 〇 2020/175072 7 卩(：171? 2020/004472

Further equipped.

The power conversion unit 3 switches the output current I 1 according to the on/off state of the bypass switch 0 1, and supplies power to the first light source unit 2 1 and the second light source unit 22. More specifically, the power conversion unit 3 is electrically connected to the DC power supply source 1 via the first input terminal 11 and the second input terminal 12. The power converter 3 is a port ◯/◯◯ converter that converts the DC power supplied from the direct current power source 1 into DC. The power conversion unit 3 lights the first light source unit 21 and the second light source unit 22 by supplying DC power to the first light source unit 21 and the second light source unit 22. The power conversion unit 3 includes a step-up converter circuit 3 1 and a step-down converter circuit 3 2.

The boost converter circuit 31 is, for example, a boost chopper circuit having an inductor, a switching element, a diode, and the like. The booster comparator circuit 3 1 is electrically connected to the DC power source 1 via the first input terminal 11 and the second input terminal 12. The step-up converter circuit 3 1 boosts the output voltage (eg, 12 V) of the DC power source 1 to a predetermined voltage (eg, 60 V) by turning on/off the switching element, and the step-down converter circuit 3 2 Output to. The switching element of the boost converter circuit 3 1 is controlled by the power control unit 4 1 described later.

[0024] The step-down converter circuit 32 is, for example, a step-down chopper circuit having an inductor, a switching element, and a diode. The step-down comparator circuit 32 reduces the output voltage of the step-up converter by turning on/off the switching element. The pair of output terminals 3 1, 3 2 of the step-down comparator circuit 3 2 are electrically connected to the first output terminal 2 1 and the second output terminal 2 2, respectively. The switching element of the step-down comparator circuit 3 2 is controlled by the power control unit 41 described later.

[0025] The smoothing capacitor 〇 1 is a pair of output terminals 3 1 and 3 of the step-down comparator circuit 3 2.

Electrically connected between 3 and 2. In other words, the smoothing capacitor 〇 1 is electrically connected between the first output terminal 2 1 and the second output terminal 22. It The smoothing capacitor C 1 can suppress the ripple of the output current I 1 of the power conversion unit 3 (step-down converter circuit 3 2). This makes it possible to suppress radiation noise emitted from a cable or the like that electrically connects the lighting device 1 and the plurality of light source units 2.

[0026] The bypass switch Q1 is composed of an enhancement type n channel M○S FET (Meta I Ox i de Sem i conductor F i ld Effect Transistor). The bypass switch Q 1 is electrically connected between the second output terminal P 2 2 and the third output terminal P 23. Specifically, in the bypass switch Q1, the drain is electrically connected to the third output terminal P23, and the source is electrically connected to the second output terminal P22. The gate of the bypass switch Q 1 is electrically connected to the control unit 4 and is controlled by the switch control unit 4 2 described later.

That is, the bypass switch Q 1 is electrically connected in parallel with the second light source unit 22. When the bypass switch Q 1 is on, the second light source unit 2 2 is short-circuited. In this case, the output current I 1 of the power conversion unit 3 is bypassed by the bypass switch Q 1 and does not flow to the second light source unit 2 2. That is, when the bypass switch Q 1 is in the on state, the second light source section 22 is in the off state, and only the first light source section 21 is in the on state. When the bypass switch Q 1 is off, the output current I 1 of the power conversion unit 3 flows to the second light source unit 2 2 so that both the first light source unit 2 1 and the second light source unit 2 2 are turned on. It becomes a state.

[0028] The first capacitor C21 is electrically connected between the first output terminal P21 and the third output terminal P23. That is, the first capacitor C 21 is electrically connected in parallel with the first light source unit 21.

[0029] The second capacitor C22 is electrically connected between the second output terminal P22 and the third output terminal P23. That is, the second capacitor C 22 is electrically connected in parallel with the second light source unit 22.

[0030] The series circuit of the first capacitor C 2 1 and the second capacitor C 2 2 is electrically connected between the output terminals P 3 1 and P 3 2 of the power conversion unit 3 (step-down converter circuit 3 2). 〇 2020/175072 9 卩(：171? 2020/004472

Has been done. Therefore, the ripple of the output current I 1 of the power conversion unit 3 (step-down converter circuit 3 2) can be suppressed by the combined capacitance of the first capacitor 0 2 1 and the second capacitor 0 2 2. This makes it possible to suppress radiation noise emitted from a cable or the like that electrically connects the lighting device 1 and the plurality of light source units 2.

[0031] The capacitance of the first capacitor 0 2 1 and the capacitance of the second capacitor 0 2 2 may be the same or different from each other. The capacity of the smoothing capacitor 0 1 and the capacity of the first capacitor 0 21 may be the same as or different from each other. The capacity of the smoothing capacitor 0 1 and the capacity of the second capacitor 0 22 may be the same as or different from each other. In other words, the first capacitor 〇 2 1, the second capacitor 〇 22 and the smoothing capacitor 〇 1 may have the same capacity or different capacities.

The control unit 4 is a computer system (for example, a microcontroller) whose main components are a processor and a memory. The control unit 4 realizes the functions of the power control unit 41 and the switch control unit 42 by executing the program stored in the memory with the processor. The program may be pre-recorded in the memory, may be provided through an electric communication line such as the Internet, or may be provided by being recorded in a recording medium such as a memory card.

The power control unit 41 is configured to control the power conversion unit 3. Specifically, the power control unit 41 monitors the output voltage of the boost comparator circuit 31 and switches the boost comparator circuit 3 1 so that the output voltage of the boost converter circuit 31 becomes constant. Control the element. That is, the power control unit 41 controls the boost converter circuit 31 with a constant voltage.

[0034] The power control unit 41 monitors the output current of the step-down converter circuit 3 2 and switches the step-down converter circuit 3 2 so that the output current of the step-down converter circuit 3 2 reaches the target value. Control the element. That is, the power control unit 41 , Constant current control is performed so that the output current I 1 of the power conversion unit 3 becomes the target value.

[0035] The power control unit 41 controls the power conversion unit 3 based on, for example, the state of the lighting switch SW1 (see FIGS. 2 and 3), so that the first light source unit 21 and the second light source unit are controlled. Controls turning on/off of 22. The lighting switch SW1 is provided on the driver's seat of the vehicle 200 (see Fig. 3) and is an operation switch for the driver to instruct the first light source unit 21 and the second light source unit 22 to turn on/off. is there. When the lighting switch SW1 is in the ON state, the power control unit 41 operates the power conversion unit 3 (boosting comparator circuit 31 and step-down comparator circuit 32). As a result, when the bypass switch Q 1 is off, both the first light source unit 21 and the second light source unit 22 are turned on, and when the bypass switch Q 1 is on, the first light source unit 2 1 is turned on. 2 Only 1 lights up. In addition, the power control unit 41 stops the power conversion unit 3 (the boost converter circuit 31 and the step-down converter circuit 32) when the lighting switch SW1 is in the off state. As a result, the first light source unit 21 and the second light source unit 22 are turned off.

The switch control unit 42 is configured to control the bypass switch Q 1 by outputting a drive signal to the bypass switch Q 1. The switch control unit 42 turns on/off the bypass switch Q 1 based on, for example, the state of the changeover switch SW2 (see FIGS. 2 and 3). The changeover switch SW2 is provided in the driver's seat of the vehicle 200 (see Fig. 3), and is an operation switch for the driver to instruct the second light source unit 22 to be turned on or off when the lighting switch SW1 is in the ON state. Is. The switch control unit 42 turns on the bypass switch Q 1 when the changeover switch SW2 is off. As a result, the second light source unit 22 is turned off. Further, the switch control unit 42 turns off the bypass switch Q 1 when the changeover switch SW2 is on. As a result, the second light source unit 22 is turned on. The lighting device 1 does not have to be directly connected to the changeover switch SW2, and may be indirectly connected via, for example, an ECU (Electronic Control Unit) mounted on the vehicle 200. In this case, the control unit 4 of the lighting device 1 switches from the ECU. 〇 2020/175072 1 1 卩(: 171-1?2020/004472

Get information indicating the status of the card.

In the lighting device 1 as described above, when the state of the second light source unit 22 is switched from the connected state to the short-circuited state, the power control unit 41 controls the bypass switch 0 1 by the switch control unit 4 2. Then, after switching the state of the second light source unit 22 from the connected state to the short-circuited state, it has a function of switching the magnitude of the output current I 1.

[0038] When the state of the second light source unit 2 2 is switched from the short-circuited state to the connected state, the power control unit 41 controls the second light source unit 2 by controlling the bypass switch <3 1 by the switch control unit 4 2. It also has a function of switching the magnitude of the output current I 1 before switching the state 2 from the short-circuited state to the connected state.

Here, the connected state is a state in which the second light source section 22 is electrically connected to the first light source section 21 and the output current I 1 flows through the second light source section 22. The short-circuited state is a state in which the second light source unit 22 is electrically short-circuited. In the connected state, bypass switch 〇 is off. In the short circuit state, the bypass switch 〇 1 is in the on state.

[0040] When the state of the second light source unit 22 is switched from the connected state to the short-circuited state, the switch control unit 42 controls the bypass switch 0 1 so that the bypass switch 0 1 changes from the off state to the on state. .. The power control unit 4 1 switches the magnitude of the output current I 1 after the switch control unit 4 2 switches the bypass switch 0 1 from the off state to the on state.

[0041] The switch control unit 42 controls the bypass switch 0 1 so that the bypass switch 0 1 is switched from the ON state to the OFF state when the state of the second light source unit 22 is switched from the short-circuited state to the connected state. .. The power control unit 41 switches the magnitude of the output current 1 before the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state.

Here, the light source unit 10 which is the load of the lighting device 1 will be described with reference to FIG.

As shown in FIG. 1, the light source unit 10 includes a first light source unit 21 and a second light source unit.

2 2 and a light source information output unit 1 1. 〇 2020/175072 12 boxes (：171? 2020 /004472

[0044] The light source information output unit 11 is set to the first when the power is supplied to the light source information output unit 11.

The light source information indicating the light emission characteristics of the first light source unit 21 and the second light source unit 22 is output.

The light source information output unit 11 includes, for example, a resistor 10. The first light source unit 21 and the second light source unit 22 are divided into a plurality of stages according to their light emission characteristics, and the resistance of the resistor 10 that constitutes the light source information output unit 11 is divided into a plurality of stages at each of the plurality of stages. The value is predetermined. In the combination of lighting both the first light source section 21 and the second light source section 22 and the case of turning on only the first light source section 21, the resistance value of the resistor 81 is determined in advance. ing. For example, the light emission characteristics are determined at the time of manufacturing, and a resistor 10 having a resistance value corresponding to the light emission characteristics is provided in the light source unit 10 as the light source information output unit 11.

[0046] When a current is output to the light source information output unit 11, a voltage corresponding to the resistance value of the resistor 10 is generated across the resistor 10 and this voltage value is applied to the first light source unit 2 1 And light source information corresponding to the light emission characteristics of the second light source unit 22. Here, the “light source information” is information corresponding to the light emission characteristics of the first light source unit 21 and the second light source unit 22, and based on the light source information, the first light source unit 21 and the second light source unit 2 The light emission characteristics of the light source unit 22 can be specified. The light emission characteristics of the first light source unit 21 and the second light source unit 22 are, for example, information indicating the specifications of the first light source unit 21 and the second light source unit 22 (specifications of the light source unit 10). The specifications of the first light source unit 21 include information on at least one of input current, input voltage, and input power to the first light source unit 21. The specifications of the second light source unit 22 include information on at least one of the input current, the input voltage, and the input power to the second light source unit 22. It should be noted that the above information on the input current includes information on the light source rated current values of the first light source unit 21 and the second light source unit 22. In the present embodiment, the specifications of the first light source unit 21 and the second light source unit 22 include the light source rated current value information as the information about the input current of the first light source unit 21 and the second light source unit 22. There is.

In the lighting device 1, the power control unit 41 of the control unit 4 controls the output voltage of the boost converter circuit 31 according to the light source rated current values of the first light source unit 21 and the second light source unit 22. Set the target voltage value. The power control unit 41 is the output of the boost converter circuit 31. 〇 2020/175072 13 卩 (：171? 2020 /004472

The switching element of the boost converter circuit 3 1 is controlled so that the input voltage becomes the target voltage value. That is, the power control unit 41 controls the boost converter circuit 3 1 at a constant voltage so that the output voltage of the boost converter circuit 3 1 becomes the target voltage value. In addition, the power control unit 41 sets the target current value of the output current I 1 of the power conversion unit 3 according to the light source rated current values of the first light source unit 21 and the second light source unit 22. The power control unit 41 controls the switching element of the step-down converter circuit 3 2 so that the output current of the step-down comparator circuit 3 2 (output current 1 of the power conversion unit 3) becomes the target current value. That is, the power control unit 41 controls the step-down converter circuit 3 2 with a constant current so that the output current of the step-down converter circuit 3 2 becomes the target current value.

As shown in FIG. 2, the above-described lighting device 1 is used for a lamp 100 which is a headlamp device mounted on a vehicle 200 (see FIG. 3). The lamp 100 according to the present embodiment includes a lighting device 1, a first light source unit 21, a second light source unit 22 and a housing 10 1.

The housing 1101 accommodates the first light source unit 21 and the second light source unit 22. The lamp 100 includes a plurality of (five in FIG. 2) lamps 110 to which the first light source unit 21 or the second light source unit 22 is attached. Each lamp 1 10 to which !_ _ 0 2 1 1 of the first light source unit 21 is attached is provided with a lens 1 11 and a reflector 1 1 2. A lens 1 11 is provided in each lamp 1 10 to which the !_ _ 0 2 2 1 of the second light source unit 22 is attached.

As shown in FIG. 3, the vehicle 200 according to the present embodiment has a pair of left and right lamps 100 mounted on a vehicle body 20 1. The lighting device 1 of each lamp 100 is electrically connected to the lighting switch 3 1 and the changeover switch 3 2 provided in the driver's seat of the vehicle 200. Lighting switch

When only 1 is turned on, the headlight for passing (first light source section 21 of each lamp 100) is turned on. When both the lighting switch 3 \^/ 1 and the switching switch 3 \^/ 2 are turned on, the headlights for traveling (the first light source section 2 1 and the second light source section 2 2 of each lamp 100) are turned on. Light.

[0051] (2) Operation example 〇 2020/175072 14 卩 (: 171-1? 2020 /004472

Next, an operation example (control method) of the lighting device 1 of the first embodiment will be described with reference to FIGS. 4 and 5.

[0052] First, referring to Fig. 4, a case of switching from a connection state in which both the first light source unit 21 and the second light source unit 22 are turned on to a short-circuit state in which only the first light source unit 21 is turned on will be described. explain. That is, an operation example of the lighting device 1 when the bypass switch 0 1 is switched from the off state to the on state will be described.

[0053] In order to turn off the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the ON state to the OFF state. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, first, the switch control unit 42 switches the bypass switch 0 1 from the OFF state to the ON state (step 3 1). As a result, the second light source unit 22 is short-circuited. After that, the power control unit 41 switches the current value of the output current I 1 (step 32).

[0054] Next, referring to Fig. 5, in the case of switching from a short-circuit state in which only the first light source unit 21 is turned on to a connection state in which both the first light source unit 21 and the second light source unit 22 are turned on, Explain. That is, an operation example of the lighting device 1 when the bypass switch 0 1 is switched from the on state to the off state will be described.

[0055] In order to turn on the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the off state to the on state. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, first, the power control unit 4 1 switches the current value of the output current I 1 (step 3 1 1). At this stage, the second light source unit 22 is still short-circuited. After that, the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state (step 3 12).

[0056] Next, when the target value of the output current 丨1 in the short circuit state (first target value 1 1 1) is larger than the target value of the output current 丨1 in the connected state (second target value I 1 2). The case will be described with reference to FIGS. 6 and 7. The above case means that the output current I 1 when only the first light source unit 2 1 is used is more than the output current I 1 when both the first light source unit 21 and the second light source unit 22 are used. When is bigger 〇 2020/175072 15 卩 (：171? 2020 /004472

First, the operation when the state of the second light source unit 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, as shown in Fig. 6, first, the switch control unit 42 switches the bypass switch 0 1 from the OFF state to the ON state. Change (point 1 1). At this time, the output voltage V 1 is applied only to the first light source unit 21 while the output current I 1 remains constant at the second target value I 12 so that the output voltage V 1 decreases. After that, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current 1 from the second target value 1 2 to the first target value 1 1 (time point 1: 1 2 ) 〇

As described above, since the bypass switch 〇 1 is turned on at the time point 1: 11 1, the output current 丨 1 does not flow to the second light source unit 2 2 after the time point 11 1 1. As a result, in the period 1 1 from time 1:1 1 to time 1:1 12, the overcurrent (the first target value 1 1 1 2 which is larger than the second target value 1 1 2 1 2 The output current 1) can be suppressed from flowing. Meanwhile, bypass switch

If the output current (1) reaches the first target value (11 1) before the output current becomes 1st, the output current (1) of the first target value (1 1) 1 which is not supposed to flow originally becomes the second current as the overcurrent. It flows to the light source section 22. It should be noted that period 11 is 5003 as an example, but the number is not limited to this.

Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the operation to switch the changeover switch 3 \^/ 2 from the off state to the on state is performed, the power control unit 41 controls the power conversion unit 3 to output the current I 1 as shown in Fig. 7. Switch the value from the first target value 11 1 to the second target value I 1 2 (time point I 13). After that, the switch control unit 42 switches the bypass switch 〇 1 from the ON state to the OFF state (

At this time, the load is applied to both the first light source unit 2 1 and the second light source unit 2 2, but the current value of the output current 1 is set to the second target value 1 1 by the constant current control of the power control unit 4 1. Keep it at 2.

[0060] From the above, in the period from 1:1 3 to 1:1 4 〇 2020/175072 16 卩(：171? 2020/004472

Due to the bypass switch 〇 1 being turned off at 1 4, there is an overcurrent (the output current I 1 of the 1st target value 1 1 1 2 which is larger than the 2nd target value 1 1 2) in the 2nd light source part 22. It can suppress the flow. Note that the period 12 is, for example, 5003, but the number is not limited to this.

[0061] Next, when the target value of the output current 丨1 in the short circuit state (first target value 1 1 1) is smaller than the target value of the output current 丨1 in the connected state (second target value I 1 2). The case will be described with reference to FIGS. 8 and 9. The above case means that the output current I 1 when only the first light source unit 2 1 is used is more than the output current I 1 when both the first light source unit 21 and the second light source unit 22 are used. When is smaller

First, the operation when the state of the second light source unit 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the operation of switching the changeover switch 3 2 from the ON state to the OFF state is performed, as shown in FIG. 8, first, the switch control unit 42 switches the bypass switch 0 1 from the OFF state to the ON state (at the time point). I 15). At this time, the output voltage V 1 is applied only to the first light source unit 21 while the output current I 1 remains constant at the second target value I 12 so that the output voltage V 1 decreases. After that, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current 1 from the second target value 1 2 to the first target value 1 1 (time point 1: 1 6 ) 〇

From the above, even in such a case, the state of the second light source unit 22 can be normally switched from the connected state to the short-circuited state. Overcurrent does not flow to the second light source section 22. It should be noted that the period 13 from the time point 1:15 to the time point 1:16 is 5003 as an example, but the number is not limited to this.

Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the operation to switch the changeover switch 3 \^/ 2 from the off state to the on state is performed, the power control unit 41 controls the power conversion unit 3 to output the current I 1 as shown in Fig. 9. Switch the value from the 1st target value 1 1 1 to the 2nd target value I 1 2 (time point I 17). Then switch control 〇 2020/175072 17 卩(：171? 2020/004472

Part 42 switches the bypass switch 〇 1 from the on state to the off state (time point I 18 ). At this time, the load is applied to both the first light source unit 2 1 and the second light source unit 2 2, but the current value of the output current 1 is set to the second target value 1 1 by the constant current control of the power control unit 4 1. Keep it at 2.

From the above, even in such a case, the state of the second light source unit 22 can be normally switched from the short-circuited state to the connected state. Overcurrent does not flow to the second light source section 22. It should be noted that the period 14 from the time point 1:17 to the time point 1:18 is 5003 as an example, but it is not limited to this value.

[0066] (3) Effect

In the lighting device 1 according to the first embodiment, after switching the state of the second light source unit 22 from the connected state to the short-circuited state, the magnitude of the output current 1 is switched. As a result, even if the first target value 1 1 of the output current 1 in the short-circuited state is larger than the second target value 1 2 of the output current 1 in the connected state, the magnitude of the output current 1 is large. The state of the second light source unit 22 can be set to the short-circuited state before switching the height. As a result, it is possible to prevent the overcurrent from flowing through the second light source unit 22.

In the lighting device 1 according to the first embodiment, the magnitude of the output current 1 is switched before switching the state of the second light source unit 22 from the short-circuited state to the connected state. As a result, even when the first target value 1 1 of the output current 1 in the short circuit state is larger than the second target value 1 2 of the output current 1 in the connected state, the second light source unit 2 It is possible to suppress the overcurrent from flowing into 2.

In the lighting device 1 according to the first embodiment, the bypass switch 〇 1 is off in the connected state, and the bypass switch 〇 1 is on in the short-circuited state. This makes it possible to easily switch between the connected state and the short-circuited state in the second light source unit 22.

In the lighting device 1 according to the first embodiment, when the state of the second light source unit 22 is switched from the connected state to the short-circuited state, the switch control unit 42 switches the bypass switch 〇 1 from the off state to the on state. After that, the power control unit 41 switches the magnitude of the output current 丨1. This makes it easy to cut the output current 1 〇 2020/175072 18 卩 (：171? 2020 /004472

Can be changed.

In the lighting device 1 according to the first embodiment, when the state of the second light source unit 22 is switched from the short-circuited state to the connected state, the switch control unit 42 switches the bypass switch 〇 1 from the ON state to the OFF state. Before that, the power control unit 41 switches the magnitude of the output current I 1. As a result, the size of the output current 1 can be easily switched.

[0071] (Embodiment 2)

In the lighting device 1 according to the second embodiment, when the state of the second light source unit 22 is switched, the current value of the output current 丨1 is set to the one of the first target value 丨11 and the second target value 伨12. The lighting device 1 according to the first embodiment differs from the lighting device 1 according to the first embodiment in that whichever is smaller. With regard to the lighting device 1 according to the second embodiment, the same components as those of the lighting device 1 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

[0072] (1) Configuration

In the lighting device 1 of the second embodiment, the power control unit 4 1 sets the current value of the output current 1 before switching the bypass switch 〇 1 to the first target value 1 1 of the output current 1 in the short-circuited state and the connection. The output current in the state is the smaller of the second target value I 1 2 of I 1 2 whichever is smaller. Here, “before the switching of the bypass switch 0 1 ”includes both the timing before the switching of the bypass switch 0 1 and the timing at the same time as the switching of the bypass switch 0 1.

[0073] Further, the power control unit 41 outputs the output current after switching the bypass switch 0 1.

The current value of 1 is the target value of the output current I 1 in the state of the second light source unit 2 2 after the switching among the first target value 11 1 and the second target value I 12. Here, “after the switching of the bypass switch 0 1 ”is meant to include the timing of the switching of the bypass switch 0 1 and the timing after the switching of the bypass switch 0 1.

[0074] (2) Operation example

An operation example of the lighting device 1 of the second embodiment will be described with reference to FIG. 〇 2020/175072 19 卩(：171? 2020/004472

[0075] First, refer to Fig. 10 for the case of switching from the connection state in which both the first light source unit 21 and the second light source unit 22 are turned on to the short-circuit state in which only the first light source unit 21 is turned on. Explain. That is, an operation example of the lighting device 1 when the bypass switch 0 1 is switched from the off state to the power state will be described.

[0076] In order to turn off the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the ON state to the OFF state. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, first, the power control unit 41 sets the current value of the output current I 1 to the first target value 1 1 and the second target value 1 1 Take the smaller of 2 (step 3 2 1). After that, the switch control unit 42 switches the bypass switch 0 1 from the off state to the on state (step 3 2 2). After that, the power control unit 41 sets the current value of the output current I 1 to the first target value 1 1 (the target value of the output current I 1 in the state of the second light source unit 2 2 after switching) ( Step 3 2 3) ₀

[0077] Next, referring to Fig. 10 regarding switching from the short-circuit state in which only the first light source unit 21 is turned on to the connection state in which both the first light source unit 2 1 and the second light source unit 2 2 are turned on. And explain. That is, an operation example of the lighting device 1 in the case where the bypass switch 0 1 is switched from the ON state to the successful state will be described.

[0078] In order to turn on the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the off state to the on state. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, first, the power control section 41 sets the current value of the output current I 1 to the first target value 1 1 and the second target value 1 1 Take the smaller of 2 (step 3 2 1). After that, the switch control unit 42 switches the bypass switch 0 1 from the on state to the off state (step 3 2 2). After that, the power control unit 41 sets the current value of the output current I 1 as the second target value I 1 2 (the target value of the output current I 1 in the state of the second light source unit 2 2 after switching) ( Step 3 2 3) ₀

[0079] Next, when the target value of the output current 丨1 in the short circuit state (first target value 1 1 1) is larger than the target value of the output current 丨1 in the connected state (second target value I 1 2). 〇 20/20/175072 (:171?2020/004472) will be described with reference to FIGS. 11 and 12.

First, the operation when the state of the second light source unit 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, the power control unit 41 first changes the current value of the output current 丨1 to The smaller value of the target value 1 1 1 and the second target value 1 1 2 (the second target value I 1 2) is set (time point 1 2 1 1). At the time point I 2 1 1, the current value of the output current 侨 1 is already the second target value 伨 12 so that the current value of the output current 侨 1 does not change. After that, the switch control unit 42 switches the bypass switch 0 1 from the off state to the on state (time point 2 1 2). At this time, the output voltage V 1 is applied only to the first light source unit 21 while the output current I 1 remains constant at the second target value I 1 2, so the output voltage V 1 decreases. After that, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current I 1 from the second target value 1 12 to the first target value 1 1 (time points 1 2 2).

As described above, since the bypass switch 〇 1 is turned on at the time point I 2 1 2, the output current I 1 stops flowing to the second light source unit 2 2 after the time point 1 2 1 2. As a result, in the period 21 from the time point 2 1 2 to the time point 22 2, the overcurrent (the 1st target value 1 1 1 1 which is larger than the 2nd target value 1 1 2) of the overcurrent in the 2nd light source part 2 2 is detected. 1) can be prevented from flowing. It should be noted that the period D21 is, for example, 500 £, but the number is not limited to this. Further, the operation at time point 1 2 1 1 1 and the operation at time point 1 2 1 1 2 may be executed simultaneously.

Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the operation to switch the changeover switch 3 \^/ 2 from the off state to the on state is performed, the power control unit 41 first changes the current value of the output current 1 to the first target as shown in Fig. 12. The smaller value of the value 1 1 and the second target value 1 2 (second target value I 1 2) shall be used (time point I 2 3). After that, the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state (time point 1 2 4 1). At this time, the load is the first light source \\0 2020/175072 21 卩 (: 17 2020 /004472

Although it becomes both 2 1 and the second light source unit 22, the constant current control of the power control unit 4 1 keeps the current value of the output current I 1 at the second target value I 1 2. After that, the power control unit 41 sets the current value of the output current 丨1 to the first target value 丨11 (time point I242).

[0083] From the above, the current value of the output current 丨1 becomes the second target value 丨12 at the time point 1 2 3 and the bypass switch 〇 1 is turned off at the time point 2 4 1, so that the second light source unit is turned off. It is possible to suppress the flow of overcurrent (output current of 1st target value 11 1 larger than 2nd target value 1 1 2) to 2 2. It should be noted that the period 22 2 from the time point 1 2 3 to the time point 1 2 4 1 is 500 3 as an example, but it is not limited to this number. Also, the operation at time point 1 2 4 1 and the operation at time point 1 2 4 2 may be executed simultaneously.

[0084] Next, when the target value of the output current I 1 in the short circuit state (first target value 1 1 1) is smaller than the target value of the output current I 1 in the connected state (second target value I 1 2). The case will be described with reference to FIGS. 13 and 14.

First, the operation when the state of the second light source unit 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, as shown in Fig. 13, first, the power control unit 4 1 changes the current value of the output current 1 to The smaller of the target value 1 1 and the second target value 1 1 2 (first target value I 1 1) is set (points 1 2 5). That is, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current I 1 from the second target value I 1 2 to the first target value I 1 1. After that, the switch control unit 42 switches the bypass switch 〇 1 from the off state to the on state (time point 2 61 ). At this time, since the output voltage V 1 is applied only to the first light source unit 21 while the output current I 1 remains constant at the first target value I 1 1, the output voltage V 1 drops. After that, the power control unit 41 sets the current value of the output current I 1 to the first target value I 1 1 (time point I 2 6 2).

From the above, even in such a case, the state of the second light source unit 22 can be normally switched from the connected state to the short-circuited state. Overcurrent in the second light source section 22 〇 2020/175072 22 卩 (：171? 2020 /004472

Not flowing. Note that the period 23 from the time point 125 to the time point 1261 is 5003 as an example, but it is not limited to this number. Also, the operation at time point I 2 6 1 and the operation at time point 1 2 6 2 may be executed simultaneously.

Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, as shown in Fig. 14, first, the power control unit 41 sets the current value of the output current 1 to the first target value. The smaller value of the value 1 1 and the second target value 1 2 (first target value I 1 1) shall be used (time point I 2 7 1). After that, the switch control unit 42 switches the bypass switch 0 1 from the on state to the off state (time point 1 27 2). The load is both the first light source unit 2 1 and the second light source unit 2 2, but the current value of the output current 1 is kept at the 1st target value 1 1 1 by the constant current control of the power control unit 4 1. .. After that, the power control section 41 controls the power conversion section 3 to switch the current value of the output current I 1 from the first target value 11 1 to the second target value 12 1 (time point 28).

From the above, even in such a case, the state of the second light source unit 22 can be normally switched from the short-circuited state to the connected state. Overcurrent does not flow to the second light source section 22. It should be noted that the period 224 from the time point 127 2 to the time point 1 228 is 500 3 as an example, but it is not limited to this number. Also, the operation at time point I 2 7 1 and the operation at time point 1 2 7 2 may be executed simultaneously.

[0089] (3) Effect

In the lighting device 1 according to the second embodiment, the current value of the output current 丨 1 before switching the bypass switch 0 1 is the smaller of the first target value 伨 1 1 and the second target value 伨 1 2. This is the current value. As a result, it is possible to accurately prevent the overcurrent from flowing through the second light source unit 22.

[0090] (Embodiment 3)

In the lighting device 1 according to the third embodiment, when the state of the second light source unit 22 is switched, the current value of the output current I 1 is smaller than the first target value I 1 and the second target value I 12. The value (third target value I 13) is the same as the lighting device 1 according to the first embodiment. 〇 2020/175072 23 卩 (: 171-1? 2020 /004472

Be different. Regarding the lighting device 1 according to the third embodiment, the same components as those of the lighting device 1 according to the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[0091] (1) Configuration

In the lighting device 1 according to the third embodiment, the power control unit 41 sets the current value of the output current 1 before switching the bypass switch 〇 1 to the first target value 1 1 1 of the output current 1 in the short-circuited state and the connection. The current value is smaller than both of the 2nd target value and 1 2 of the output current 1 in the state (3rd target value 1 3). Here, “before switching the bypass switch 0 1 ”is meant to include both the timing before the switching of the bypass switch 0 1 and the timing simultaneous with the switching of the bypass switch 0 1.

[0092] In addition, the power control unit 4 1 outputs the output current after switching the bypass switch 0 1.

[0093] (2) Operation example

An operation example of the lighting device 1 of the third embodiment will be described with reference to FIG.

[0094] First, referring to Fig. 15 for the case of switching from the connection state in which both the first light source unit 21 and the second light source unit 22 are turned on to the short-circuit state in which only the first light source unit 21 is turned on, Explain. That is, an operation example of the lighting device 1 when the bypass switch 0 1 is switched from the off state to the power state will be described.

[0095] In order to turn off the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the ON state to the OFF state. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, first, the power control unit 41 sets the current value of the output current I 1 to the first target value 1 1 and the second target value 1 1 Set a value lower than 2 (3rd target value 1 13) (step 3 3 1). After that, the switch control unit 42 〇 2020/175072 24 卩 (: 171-1? 2020 /004472

Bypass switch 0 1 is switched from the off state to the on state (step 3 32). After that, the power control unit 41 switches the current value of the output current I 1 (step 3 3 3). That is, the power control unit 41 switches the current value of the output current 丨1 from the third target value 丨13 to the first target value 丨11.

[0096] Next, refer to Fig. 15 for the case of switching from the short-circuited state in which only the first light source unit 21 is turned on to the connected state in which both the first light source unit 21 and the second light source unit 2 2 are turned on. And explain. That is, an operation example of the lighting device 1 in the case where the bypass switch 0 1 is switched from the ON state to the successful state will be described.

[0097] In order to turn on the second light source unit 22, the driver performs an operation of switching the changeover switch 3 \^/2 from the off state to the on state. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, first, the power control unit 4 1 switches the current value of the output current I 1 (step 3 3 1). That is, the power control unit 41 sets the current value of the output current 丨1 to a value lower than the first target value 伨11 and the second target value 伨12 (third target value I13). After that, the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state (step 332). After that, the power control unit 41 switches the current value of the output current I 1 (step 3 3 3). That is, the power control unit 41 switches the current value of the output current I 1 from the third target value I 13 to the second target value I 12.

[0098] Next, when the target value of the output current 丨1 in the short-circuited state (first target value 1 1 1) is larger than the target value of the output current 丨1 in the connected state (second target value I 1 2). The case will be described with reference to FIGS. 16 and 17.

First, the operation when the state of the second light source unit 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the on-state to the off-state, the power control unit 4 1 changes the current value of the output current 1 to the first target value as shown in Fig. 16. Set a value smaller than 丨 1 1 and the second target value 1 1 2 (third target value 丨 13) (time point I 3 1). In this case, the constant current control of the power control unit 41 reduces the output current I 1. After that, the switch control unit 42 turns the bypass switch 〇 1 from the off state to the on state. 〇 2020/175072 25 卩 (：171? 2020 /004472

Switch to (time point I 3 2). At this time, since the output current V 1 remains constant at the third target value 13 and the output voltage V 1 is applied only to the first light source unit 21, the output voltage V 1 drops. After that, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current I 1 from the third target value I 13 to the first target value I 11 (time point 3 3).

[0100] As described above, since the bypass switch 〇 1 is turned on at the time point I 3 2, the output current 丨 1 does not flow to the second light source unit 2 2 after the time point 13 2. As a result, in the period 31 from the time point 31 to the time point 33, the output current of the overcurrent (first target value 11 1 which is larger than the second target value 11 2) in the second light source unit 22 is increased. 1) does not flow. Note that the period D 31 is, for example, 500 £, but the number is not limited to this.

[0101] Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, the power control section 41 changes the current value of the output current 1 to the first target value as shown in Fig. 17. Set a value (third target value I 1 3) that is smaller than 丨 1 1 and the second target value 丨 1 2 (time point I 3 4). After that, the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state (time point 1 3 5). At this time, the loads are both the first light source unit 2 1 and the second light source unit 2 2, but the constant current control of the power control unit 41 causes the current value of the output current 1 to change to the third target value I 1 Keep 3 After that, the power control unit 41 controls the power conversion unit 3 to switch the current value of the output current I 1 from the third target value I 13 to the second target value I 12 (time point 3 6).

[0102] From the above, the output current in the period 3 2 from the time 3 4 to the time 3 6

The current value of I 1 is the third target value 13 and at the time I 35, the bypass switch 〇 1 is turned off, so that the overcurrent (second target value 1 1 Output current 1) of 1st target value 1 1 larger than 2 does not flow. It should be noted that the period number 32 is, for example, 5003, but is not limited to this value.

[0103] Next, the target value (first target value 1 1 1) of the output current I 1 in the short circuit state is connected. 〇 2020/175072 26 卩(：171? 2020/004472

A case where the output current is smaller than the target value (second target value I 1 2) in the continuous state will be described with reference to FIGS. 18 and 19.

First, the operation when the state of the second light source section 22 is switched from the connected state to the short-circuited state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, the power control unit 41 first changes the current value of the output current 1 to The value is smaller than the target value 11 and the second target value 12 (3rd target value 13) (point I 41). At this time, the current value of the output current I 1 decreases from the second target value I 12 to the third target value I 13. After that, the switch control unit 42 switches the bypass switch 0 1 from the dead state to the on state (time point 1 4 2). At this time, the load is only the first light source unit 21. However, the current value of the output current I 1 is made constant at the third target value I 1 3 by the constant current control of the power control unit 4 1. After that, the power control unit 41 switches the current value of the output current 丨1 from the third target value 丨13 to the first target value 丨11 (time point 43).

As described above, even in such a case, the state of the second light source unit 22 can be normally switched from the connected state to the short-circuited state. It is possible to suppress overcurrent from flowing into the second light source unit 22. Note that the period 41 from the time point 41 to the time point 43 is 5003 as an example, but it is not limited to this value.

Next, the operation when the state of the second light source unit 22 is switched from the short-circuited state to the connected state will be described with reference to FIG. When the changeover switch 3 \^/ 2 is switched from the off state to the on state, as shown in Fig. 19, first, the power control unit 41 sets the current value of the output current 丨1 to the first target value. Set a value smaller than the value 1 1 and the second target value 1 2 (third target value I 1 3) (time point I 4 4). After that, the switch control unit 42 switches the bypass switch 0 1 from the ON state to the OFF state (time point 1 45). The load becomes both the first light source unit 2 1 and the second light source unit 2 2, but the constant current control of the power control unit 4 1 keeps the current value of the output current 丨 1 at the third target value I 1 3. .. After that, the power control unit 41 controls the power conversion unit 3 to change the current value of the output current 丨1 from the third target value 丨1 3 to the second target value 丨12. 〇 2020/175072 27 卩(：171? 2020/004472

Switch (point 4 6).

From the above, even in such a case, the state of the second light source unit 22 can be normally switched from the short-circuited state to the connected state. It is possible to suppress overcurrent from flowing into the second light source unit 22. It should be noted that the period D 42 from the time point 4 4 to the time point 4 6 is 500 3 as an example, but it is not limited to this value.

[0108] (3) Effect

In the lighting device 1 according to the third embodiment, the current value of the output current 丨 1 is smaller than both the first target value 伨 1 1 and the second target value 伨 1 2 before switching the bypass switch 0 1. The third target value I 1 3). As a result, it is possible to accurately prevent the overcurrent from flowing through the second light source unit 22.

(Fourth Embodiment)

As shown in FIG. 20, the lighting device 1 according to the fourth embodiment has a first light source unit 2 1 to which a first bypass switch 〇 1 1 is connected in parallel, and a second light source unit 2 2 to which a second light source unit 2 2 is connected. It differs from the lighting device 1 (see FIG. 1) according to the first embodiment in that the bypass switches 0 1 2 are connected in parallel. Regarding the lighting device 1 according to the fourth embodiment, the same components as those of the lighting device 1 according to the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[01 10] (1) Composition

As shown in FIG. 20, the lighting device 1 according to the fourth embodiment includes a first bypass switch 0 1 1 2 and a second bypass switch 0 1 2. The first bypass switch ○ 11 is electrically connected in parallel to the first light source unit 21. The second bypass switch 0 12 is electrically connected in parallel to the second light source unit 22. The first bypass switch 0 1 1 1 is separate from the second bypass switch 0 1 2.

[01 11] The switch control unit 42 of Embodiment 4 includes the first bypass switch 〇 11 and the first bypass switch 〇 11.

2 Bypass switch 0 1 2 is controlled.

[0112] The power control unit 41 of the fourth embodiment outputs the output current according to the on/off state of the first bypass switch 0 1 1 and the on/off state of the second bypass switch 0 1 2. And power is supplied to the first light source unit 21 and the second light source unit 22. 〇 2020/175072 28 卩 (: 171-1? 2020 /004472

[01 13] When the state of the first light source unit 21 is switched from the first state to the second state, the power control unit 4 1 controls the switch control unit 4 2 to control the first bypass switch <3 1 1. After switching the state of the first light source unit 21 from the first state to the second state, the function of switching the magnitude of the output current 1 is provided.

[01 14] When the state of the first light source unit 21 is switched from the second state to the first state, the power control unit 41 controls the first bypass switch <3 1 1 by the switch control unit 4 2. Further, before switching the state of the first light source unit 21 from the second state to the first state, it further has a function of switching the magnitude of the output current I 1.

[0115] Here, the first state means a connection state in which the first light source unit 21 is electrically connected to the second light source unit 22 and the output current I1 flows in the first light source unit 21. Say. The second state is a short-circuit state in which the first light source unit 21 is electrically short-circuited.

[0116] When the state of the first light source unit 2 1 is switched from the first state to the second state, the switch control unit 42 controls the first bypass switch 0 1 1 so that it switches from the OFF state to the ON state. 1 Bypass switch ○ Controls 1 1. The power control unit 4 1 switches the magnitude of the output current 1 after the switch control unit 4 2 switches the first bypass switch <3 1 1 from the off state to the on state.

[0117] When the state of the first light source unit 21 is switched from the second state to the first state, the switch control unit 42 sets the first bypass switch 0 1 1 so as to change from the ON state to the OFF state. 1 Bypass switch ○ Controls 1 1. The power control section 41 switches the magnitude of the output current 1 before the switch control section 42 switches the first bypass switch <3 1 1 from the ON state to the OFF state.

[01 18] (2) Effect

In the lighting device 1 according to the fourth embodiment, after the state of the first light source unit 21 is switched from the first state (connected state) to the second state (short-circuited state), the magnitude of the output current I 1 is switched. As a result, even if the target value of the output current I 1 when the first light source unit 21 is short-circuited is larger than the target value of the output current I 1 when the first light source unit 21 is connected, the output current I 1 1 light before switching the size of 1 〇 2020/175072 29 卩 (：171? 2020 /004472

The source part 21 can be short-circuited. As a result, it is possible to prevent the overcurrent from flowing to the first light source unit 21.

[0119] (Embodiment 5)

The lighting device 1 according to the fifth embodiment is different from the lighting device 1 according to the first embodiment (see FIG. 1) in that it includes three light source units 2 as shown in FIG. Regarding the lighting device 1 according to the fifth embodiment, the same components as those of the lighting device 1 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

[0120] (1) Composition

As shown in FIG. 21, the lighting device 1 of the fifth embodiment further includes a third light source unit 23 together with the first light source unit 21 and the second light source unit 22. Note that, regarding the lighting device 1 of the fifth embodiment, the description of the same configuration and function as the lighting device 1 of the first embodiment (see FIG. 1) is omitted.

[0121] Further, the lighting device 1 of the fifth embodiment includes a first bypass switch 〇 1 1, a second bypass switch 〇 12 and a third bypass switch 〇 13 as shown in FIG. .. The first bypass switch 0 1 1 is electrically connected in parallel to the first light source unit 2 1. The second bypass switch 0 12 is electrically connected in parallel to the second light source unit 22.

It is electrically connected in parallel to the third light source unit 23. The first bypass switch 0 1 1 1 is separate from the second bypass switch 0 1 2 and the third bypass switch 0 1 3.

[0122] Further, the first bypass switch 〇 1 1 is electrically connected in parallel with the first capacitor 〇 2 1, and the second bypass switch 〇 1 2 is electrically connected to the second capacitor 〇 2 2. Are connected in parallel to

A third capacitor 〇 2 3 is electrically connected in parallel to.

[0123] (2) Operation example

Next, an operation example of the lighting device 1 of the fifth embodiment will be described with reference to FIG.

[0124] First, from the state in which all of the first light source unit 21, the second light source unit 22 and the third light source unit 23 are turned on (first connected state), the second light source unit 22 and the third light source unit 2 Light source 2 3 〇 2020/175072 30 卩 (：171? 2020 /004472

When switching to the state in which only the light is turned on (second connection state), the first bypass switch 0 1 1 is switched from the off state to the on state (time point 5 1). At this time, the loads are the second light source unit 22 and the third light source unit 23, but the output current I 1 is kept constant at the first target value I 14 by the constant current control of the power controller 41. After that, the power control unit 41 increases the current value of the output current I 1 (time point 15 2). The current value of the output current 丨1 remains at the first target value 丨14 at time point I 51, and switches from the first target value 侨1 4 to the second target value 丨15 at time point 15.2. ..

[0125] As described above, since the first bypass switch 0 1 1 is turned on at the time point I 5 1 before the time point I 5 2, the time period from the time point I 5 1 to the time point I 5 2 is increased. In Fig. 51, it is possible to prevent the overcurrent (the output current I 1 of the second target value I 15) from flowing through the first light source unit 21.

[0126] Subsequently, the state in which the second light source unit 22 and the third light source unit 23 are turned on (second connected state) is switched to the state in which only the second light source unit 22 is turned on (first short-circuited state). When changing, the 3rd bypass switch 0 1 3 is changed from an off state to an on state (time point 1 5 3). At this time, the load is only the second light source unit 22. However, the output current I 1 is kept constant at the second target value I 15 by the constant current control of the power controller 41. After that, the power control unit 41 increases the current value of the output current I 1 (time point 1 5 4). The current value of the output current 丨1 is up to the second target value I 15 at time 5 3 and switches from the second target value ą 15 to the second target value Ĥ 16 at time I 54.

[0127] As described above, since the third bypass switch 0 1 3 is turned on at the time point I 5 3 before the time point I 5 4, the time period from the time point 5 3 to the time point 5 4 is set. In 2, the overcurrent (the output current I 1 of the second target value I 16) flowing in the third light source unit 23 can be suppressed.

[0128] After that, from the state in which only the second light source unit 22 is turned on (first short-circuited state), the

1 When switching to the state where the light source unit 2 1 and the second light source unit 2 2 are turned on (the second short-circuit state), the switch control unit 4 2 switches the first bypass switch 〇 1 1 from the ON state to the OFF state. Before the power control unit 41, the output current 1 〇 2020/175072 31 卩(：171? 2020/004472

Decrease the value (time point 1 5 5). After that, the switch control unit 42 switches the first bypass switch 〇 1 1 from the ON state to the OFF state (time point I 5 6). The current value of the output current 丨1 switches from the second target value I 1 6 to the second target value 丨15 at time 5 5 before time 5 6.

[0129] As described above, the first bypass switch 〇 at time point I 5 6 after time point I 55

Since 1 1 is turned off, overcurrent (second target value 1 1 5 and output of I 1 6) is output to the first light source unit 2 1 during the period 5 3 from time 5 5 to time 5 6. It is possible to suppress the flow of current 1).

[0130] After that, from the state in which the first light source unit 21 and the second light source unit 22 are turned on (the second short-circuited state), the first light source unit 21, the second light source unit 22, and the third light source unit 2 When switching to the state where 3 is turned on (first connection state), the power control section 41 outputs the output current before the switch control section 42 switches the third bypass switch 0 1 3 from the ON state to the OFF state. Decrease the current value of 1 (time point 1 5 7). However, in the example of Figure 22, the current value of the output current [1] is already small and remains constant (1st target value [14]). After that, the switch control unit 42 switches the third bypass switch 0 13 from the ON state to the OFF state (time point I 5 8

[0131] Also in the period 554 from the time point I57 to the time point I58, it is possible to suppress the overcurrent from flowing to the third light source unit 23.

[0132] (Modification)

An operation example of the lighting device 1 according to the modified examples of Embodiments 1 to 5 will be described with reference to FIG. FIG. 23 shows a modified example of the first embodiment. Here, a case will be described in which both the first light source unit 21 and the second light source unit 22 are turned on to a state where only the first light source unit 21 is turned on. That is, an operation example of the lighting device 1 when the bypass switch 0 1 is switched from the off state to the on state will be described.

[0133] In order to turn off the second light source unit 22, the driver switches the changeover switch 3 \^/2 from the ON state to the OFF state. 〇 2020/175072 32 卩 (: 171-1? 2020 /004472

[0134] When the changeover switch 3 \^/ 2 is switched from the ON state to the OFF state, the power control unit 4 1 has a predetermined stop period (6 0) (a period from 1 6 1 to 1 6 3) During this period, the power conversion unit 3 is stopped. Specifically, the power control unit 41 stops the step-down comparator circuit 32 during the stop period D60. The power control unit 41 may stop both the step-down comparator circuit 3 2 and the step-up comparator circuit 3 1 during the stop period 60.

[0135] Therefore, in the stop period D60, the output current I1 of the power conversion unit 3 is reduced to substantially zero compared to before the stop period D60. The power control unit 41 restarts the operation of the power conversion unit 3 (step-down converter circuit 3 2) when the stop period D 0 60 has elapsed (time point 16 3), and the output current I 1 of the power conversion unit 3 is changed. Restore the state before the stop. That is, the power control unit 41 temporarily reduces the output current I 1 of the power conversion unit 3 when the changeover switch 3 \^/2 is switched from the on state to the off state. The suspension period is 60, for example, but is not limited to this number.

[0136] The switch control unit 42 is in a state where the output current I1 of the power conversion unit 3 is reduced by the power control unit 4 1 when the changeover switch 3 2 is switched from the ON state to the OFF state (stop period. Switch the bypass switch 0 1 from the off state to the on state. In other words, the power control unit 41 stops the power conversion unit 3 before the switch control unit 42 switches the bypass switch 0 1 from the off state to the on state. In this modified example, the switch control unit 42 is configured such that the power control unit 4 1 starts reducing the output current I 1 of the power conversion unit 3 from the time 1 61 to the time I when the first period 6 1 passes. 6 At 2, switch bypass switch 〇 1 from off to on. As an example, 1st period Ding 61 is 103, but it is not limited to this number. The power conversion unit 3 operates from the time I 6 2 when the switch control unit 42 switches the bypass switch 0 1 from the off state to the on state to the time 1 6 3 when the second period 6 2 elapses. Restart the operation of 3. As an example, the second period D62 is 203, but it is not limited to this number.

[0137] In the lighting device 1 of the present modification, the power conversion unit 3 is stopped, and 〇 2020/175072 33 卩(：171? 2020/004472

Switch 0 is switched from the off state to the on state. Therefore, a surge current is generated from the smoothing capacitor 〇 1 with the output current 1 of the power conversion unit 3 being substantially zero. As a result, an overcurrent is suppressed from flowing into the light source unit 2. More specifically, when the bypass switch 〇 1 is switched from the OFF state to the ON state, the bypass switch 0 1 of the plurality of light source units 2 is not connected in parallel to the light source unit 2 (first light source unit 2 1) Overcurrent is suppressed from flowing into the device.

[0138] In addition, since the smoothing capacitor 0 1 is discharged in the first period 6 1 from when the power conversion unit 3 is stopped to when the bypass switch 0 1 is turned on, the surge when the bypass switch 0 1 is turned on is generated. The current is suppressed. Therefore, the overcurrent is suppressed from flowing in the first light source unit 21. In the first period, the peak value of the current source 2 is the peak value of the current when the surge current of the smoothing capacitor 0 1 flows into the first light source unit 21. It is preferably set to be smaller than the current value of 2. The current value of the current I 2 in the steady state of the first light source unit 21 is the target value of the output current I 1 of the power conversion unit 3 (step-down converter circuit 3 2) that is controlled by constant current.

[0139] The first capacitor 0 21 is electrically connected in parallel with the first light source unit 21. Therefore, even if the bypass switch 0 1 is switched from the off state to the on state, there is no change in the electrical load across the first capacitor 0 21. Therefore, surge current does not occur from the first capacitor ○ 21.

[0140] The second capacitor 02 2 is electrically connected in parallel with the bypass switch 0 1. Therefore, when the bypass switch 0 1 is switched from the off state to the on state, the second capacitor 0 2 2 is short-circuited via the bypass switch 0 1. Therefore, overcurrent is suppressed from flowing in the second light source unit 22.

[0141] Further, between the output terminals 3 1 and 3 2 of the power conversion unit 3, the smoothing capacitor 〇 1 and the series circuit of the first capacitor 〇 2 1 and the second capacitor 〇 22 are electrically connected in parallel. Has been done. Power conversion is performed by the combined capacity of the smoothing capacitor 〇, the series circuit of the first capacitor 〇21 and the second capacitor 〇22. 〇 2020/175072 34 卩 (：171? 2020 /004472

It is possible to suppress the ripple of the output current 1 of the socket 6 3. Therefore, in the lighting device 1 of the present embodiment, the capacity of the smoothing capacitor <3 1 can be reduced as compared with the configuration in which the first capacitor 0 2 1 and the second capacitor 0 2 2 are not provided. As a result, the surge current of the smoothing capacitor 0 1 can be suppressed, and the overcurrent can be suppressed from flowing into the first light source unit 21.

[0142] As another modification of Embodiments 1 to 5, in the lighting device 1, the smoothing capacitor (31 is not an indispensable configuration, which is connected between the output terminals 3 1, 3 2 of the power conversion unit 3 The smoothing capacitor 0 1 may be omitted as shown in Fig. 24. Fig. 24 shows a modified example of the embodiment 1. Between the output terminals 3 1 and 3 2 of the power conversion unit 3. A plurality of capacitors 〇 2 (first capacitor 〇 21 and second capacitor 〇 22) are connected in series with each other, so even if the smoothing capacitor 〇 1 is omitted, multiple capacitors 〇 2 The combined capacity of the (first capacitor 〇 2 1, the second capacitor 〇 2 2) can suppress the ripple of the output current I 1 of the power conversion unit 3. As a result, the lighting device 1 and a plurality of light source units It is possible to suppress the radiant noise radiated from the cable etc. that electrically connects with 2. Also, as shown in Fig. 25, the output current of power converter 3 is not reduced and bypass switch is not used. Even when 0 1 is switched from the off state to the on state (time point 71), the smoothing capacitor 〇 is omitted, so that an overcurrent is suppressed from flowing in the first light source unit 2 1.

As another modification of Embodiments 1 to 5, lighting device 1 includes a computer system (control unit 4). The computer system mainly consists of a processor and memory as hardware. The function as the lighting device 1 is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunication line, or recorded in a non-transitory recording medium such as a memory card, an optical disc, a hard disc drive, etc. that can be read by the computer system. May be provided. The processor of the computer system is a semiconductor integrated circuit (丨) or a large-scale It consists of one or more electronic circuits, including integrated circuits (LS I). The integrated circuits such as C and LS are called differently depending on the degree of integration, and are called system LS, VLS I (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Including circuits. Furthermore, regarding the F-PGA (Field-Programmable Gate Array) that is programmed after the manufacturing of the LS, or the logical device that can reconfigure the junction relationship inside the LS or reconfigure the circuit partition inside the LS. Can also be used as a processor. The plurality of electronic circuits may be integrated in one chip, or may be distributed and provided in the plurality of chips. The plurality of chips may be integrated in one device, or may be distributed and provided in the plurality of devices. For example, the power control unit 41 and the switch control unit 42 may be integrated into one chip, or may be distributed and provided in a plurality of chips.

[0144] Further, it is not essential for the lighting device 1 that the plurality of constituent elements (or functions) of the lighting device 1 are integrated in one housing. The constituent elements (or functions) of the lighting device 1 may be distributed and provided in a plurality of housings.

[0145] (Summary)

The following aspects are disclosed from the embodiment and the modified examples described above.

[0146] The lighting device (1) according to the first aspect includes a power conversion unit (3), a bypass switch (Q1), a switch control unit (42), and a power control unit (4 1). To prepare. The power converter (3) outputs an output current (11) to the light source unit (10) including the first light source (21) and the second light source (22) to supply power. The first light source unit (21) and the second light source unit (22) are electrically connected to each other in series. The bypass switch (Q 1) is electrically connected in parallel to the second light source unit (22). The switch control section (42) controls the bypass switch (Q 1). The power control unit (41) controls the power conversion unit (3). The power converter P (3) supplies power to the light source unit (10) by switching the size of the output current (1) according to the on/off state of the bypass switch (Q 1). The power control unit (4 1) changes the state of the second light source unit (22) from connected to short-circuited. 〇 2020/175072 36 卩 (：171? 2020 /004472

When the switch control unit (4 2) controls the bypass switch (○ 1) to switch the second light source unit (2 2) from the connected state to the short-circuited state, the output current (1) is increased. It has a function to switch the height. In the connected state, the second light source unit (2 2) is electrically connected to the first light source unit (2 1) and the output current (1 1) flows through the second light source unit (2 2 ). The short-circuited state is a state in which the second light source unit (22) is electrically short-circuited.

According to the lighting device (1) of the first aspect, the output current (

Even if the first target value (1 1 1) of I 1) is larger than the second target value (丨 1 2) of the output current (丨 1) in the connected state, the magnitude of the output current (丨 1) is large. The second light source unit (2 2) can be short-circuited before switching. As a result, it is possible to prevent the overcurrent from flowing through the second light source section (22).

[0148] The lighting device (1) according to the second aspect provides the power control unit (41) according to the first aspect, when the second light source unit (2 2) is switched from the short-circuited state to the connected state. , The switch controller (4 2) controls the bypass switch (〇 1) to switch the magnitude of the output current (丨 1) before switching the second light source (2 2) from the short-circuited state to the connected state. It has more functions.

[0149] According to the lighting device (1) of the second aspect, the output current (

Even if the first target value (1 1 1) of I 1) is larger than the second target value (丨 1 2) of the output current (丨 1) in the connected state, the second light source unit (2 2) It is possible to suppress overcurrent from flowing into the.

[0150] In the lighting device (1) according to the third aspect, in the second aspect, the bypass switch (○1) is in the off state in the connected state. In short circuit condition, bypass switch (0 1) is on.

[0151] According to the lighting device (1) of the third aspect, it is possible to easily switch between the connected state and the short-circuited state in the second light source section (2 2 ).

[0152] In the lighting device (1) according to the fourth aspect, in the third aspect, when the switch control unit (4 2) switches the second light source unit (2 2) from the connected state to the short-circuited state, Bypass the bypass switch (○ 1) from the off state to the on state. 〇 2020/175072 37 卩(：171? 2020/004472

Switch (○ 1). The power control unit (4 1) switches the bypass switch (0 1) from the off state to the on state when the second light source unit (2 2) is switched from the connected state to the short-circuited state. After that, switch the output current (1).

According to the lighting device (1) of the fourth aspect, the magnitude of the output current (11) can be easily switched.

[0154] In the lighting device (1) according to the fifth aspect, in the third or fourth aspect, the switch control unit (4 2) switches the second light source unit (2 2) from the short-circuited state to the connected state. If this occurs, control the bypass switch (○ 1) so that it goes from the ON state to the OFF state. The power control unit (4 1) switches the bypass switch (〇 1) from the ON state to the OFF state when the second light source unit (2 2) is switched from the short-circuited state to the connected state. First, switch the magnitude of the output current (1).

According to the lighting device (1) of the fifth aspect, the magnitude of the output current (11) can be easily switched.

[0156] In the lighting device (1) according to the sixth aspect, in any one of the first to third aspects, the power control unit (41) is configured to switch before the switching of the bypass switch (〇1). The output current (丨1) current value is the first target value (丨11) of the output current (丨1) in the short-circuited state and the second target value (1 1 2) of the output current (丨1) in the connected state. ), whichever is smaller. The power control unit (4 1) sets the current value of the output current (丨 1) after switching the bypass switch (○ 1) to the first target value (丨 11) and the second target value (1 1 2). ), the target value of the output current (1) in the state of the second light source section (2 2) after switching.

[0157] According to the lighting device (1) of the sixth aspect, it is possible to accurately prevent the overcurrent from flowing to the second light source unit (22).

[0158] In the lighting device (1) according to the seventh aspect, in any one of the first to third aspects, the power control unit (41) is configured to switch before the switching of the bypass switch (〇1). Set the output current (丨1) current value to the first target of the output current (丨1) in the short-circuit state. 〇 2020/175072 38 卩 (: 171-1? 2020 /004472

The current value (3rd target value I 1 3) is smaller than both the value (1 1 1) and the second target value (1 1 2) of the output current (1 1) in the connected state. The power control unit (4 1) changes the current value of the output current (丨 1) after switching the bypass switch (○ 1) to the first target value (丨 11) and the second target value (1 1 2). Of these, the target value of the output current (11) in the state of the second light source section (22) after switching is set.

[0159] According to the lighting device (1) of the seventh aspect, it is possible to accurately suppress the overcurrent from flowing to the second light source unit (2 2).

[0160] A lighting device (1) according to an eighth aspect is any one of the first to seventh aspects, further including a first bypass switch (○11). The first bypass switch (○ 1 1) is electrically connected in parallel to the first light source unit (2 1). The first bypass switch (○ 11) is separate from the second bypass switch. The second bypass switch (0 1 2) is electrically connected in parallel to the second light source section (2 2). The switch control unit (42) controls the first bypass switch (○ 11). The power conversion unit (3) supplies power to the light source unit (10) by switching the magnitude of the output current (1) according to the on/off state of the first bypass switch (0 1 1). .. When the state of the first light source unit (2 1) is switched from the first state to the second state, the power control unit (4 1) causes the switch control unit (4 2) to turn on the first bypass switch (〇 1 1). It further has a function of switching the magnitude of the output current (11) after controlling and switching the first light source section (21) from the first state to the second state. The first state is a state in which the first light source unit (2 1) is electrically connected to the second light source unit (2 2) and the output current (1 1) flows through the first light source unit (2 1). is there. The second state is a state in which the first light source section (21) is electrically short-circuited.

[0161] According to the lighting device (1) of the eighth aspect, the target value of the output current (C1) in the short-circuit state of the first light source unit (21) is equal to that of the first light source unit (21). Even if the output current (丨1) is larger than the target value in the connected state, the first light source unit (21) should be short-circuited before switching the output current (丨1). You can As a result, it is possible to prevent overcurrent from flowing through the first light source unit (21). 〇 2020/175072 39 卩 (：171? 2020 /004472

[0162] In the lighting device (1) according to the ninth aspect, in the eighth aspect, the power control unit (41) is configured such that the first light source unit (21) is switched from the second state to the first state. In this case, before the switch control unit (4 2) controls the first bypass switch (0 1 1) to switch the first light source unit (2 1) from the second state to the first state, the output current (1 1) It also has the function of switching the size of the.

[0163] According to the lighting device (1) of the ninth aspect, the target value of the output current (11) in the short-circuit state (second state) of the first light source section (21) is the first light source section. Even if the output current (1) in the connection state (1st state) of (2 1) is larger than the target value, it is possible to suppress the overcurrent from flowing into the first light source unit (2 1).

[0164] In the lighting device (1) according to the tenth aspect, in any one of the first to ninth aspects, the light source unit (10) includes a first light source unit (21) and a second light source unit. The light source unit (22) further includes a third light source unit (23) connected in series. The lighting device (1) further includes a bypass switch for the third light source unit (third bypass switch 0 13). The bypass switch for the third light source unit is electrically connected in parallel to the third light source unit (23). The switch control unit (42) controls the bypass switch for the third light source unit. The power converter (3) supplies power to the light source unit (10) by switching the magnitude of the output current (1) according to the on/off state of the third light source bypass switch. The power control unit (4 1) controls the switch when the state of the third light source unit (2 3) is switched from the connection state of the third light source unit (2 3) to the short-circuit state of the third light source unit (2 3). Part (42) controls the bypass switch for the third light source part to change the third light source part (2 3) from the connected state of the third light source part (2 3) to the short-circuited state of the third light source part (2 3). After switching, it also has the function of switching the magnitude of the output current (1). The connection state of the third light source unit (23) is such that the third light source unit (23) is electrically connected to at least one of the first light source unit (21) and the second light source unit (22). The output current (11) flows through the third light source (23). The short-circuit state of the third light source unit (23) is a state in which the third light source unit (23) is electrically short-circuited. 〇 2020/175072 40 卩 (：171? 2020 /004472

According to the lighting device (1) of the tenth aspect, even when the number of the light source units 2 is three or more, not only the second light source units (2 2) but also the third light source unit (2 2 ). It is possible to prevent overcurrent from flowing through the light source (23).

[0166] In the lighting device (1) according to the eleventh aspect, in the tenth aspect, the power control unit (41) includes a third light source unit (23) and a third light source unit (23). ), the switch control unit (4 2) controls the third light source bypass switch (third bypass switch 0 1 3) when the third light source unit (2 3) is connected. Function to switch the magnitude of output current (1 1) before switching the third light source (2 3) from the short-circuited state of the third light source (2 3) to the connected state of the third light source (2 3) Further has.

[0167] According to the lighting device (1) of the eleventh aspect, the target value of the output current (丨1) in the short-circuited state of the third light source unit (23) is set to the third light source unit (23). Even when the output current in the connected state (1) is larger than the target value, it is possible to suppress the overcurrent from flowing into the third light source unit (23).

[0168] The lamp (100) according to the 12th aspect is the lighting device (1) according to any one of the 1st to 11th aspects, a first light source section (21), and a 2nd aspect. The light source unit (2 2) and the housing (1 0 1) are provided. The housing (1 0 1) houses the first light source unit (2 1) and the second light source unit (2 2 ).

According to the lamp (1 0 0) of the 12th aspect, in the lighting device (1), the first target value (1 1 1) of the output current (丨 1) in the short-circuited state is changed to the connected state. Even if the output current (丨1) is larger than the second target value (1 1 2), the second light source (2 2) is short-circuited before switching the output current (丨1). Can be in a state. As a result, it is possible to prevent the overcurrent from flowing through the second light source section (22).

[0170] A vehicle (200) according to a thirteenth aspect includes a lamp (1OO) according to the twelfth aspect, and a vehicle body (2O1). The vehicle body (2 0 1) is equipped with a light fixture (1 0 0).

[0171] According to the vehicle (200) of the thirteenth aspect, in the lighting device (1), 〇 2020/175072 41 卩 (：171? 2020 /004472

Even if the first target value (1 1 1) of the output current (1 1) in the short circuit state is larger than the second target value (1 1 2) of the output current (1 1) in the connected state, the output Before switching the magnitude of the current (1), the second light source section (2 2) can be short-circuited. As a result, it is possible to prevent the overcurrent from flowing through the second light source section (22).

[0172] The control method according to the fourteenth aspect is a control method for controlling the power conversion unit (3) and the bypass switch (O1). The power converter (3) outputs an output current (1) to a light source unit (1 0) including a first light source (2 1) and a second light source (2 2) electrically connected in series. To output power. The bypass switch (0 1) is electrically connected in parallel to the second light source unit (2 2). When the state of the second light source unit (2 2) is switched from the connected state to the short-circuited state, the bypass switch (0 1) is controlled to short-circuit the second light source unit (2 2) from the connected state. After switching to the state, there is a step of switching the magnitude of the output current (1). The connection state is a state in which the second light source unit (2 2) is electrically connected to the first light source unit (2 1) and the output current (1 1) flows through the second light source unit (2 2). .. The short-circuited state is a state in which the second light source section (22) is electrically short-circuited. When the second light source unit (2 2) is switched from the short-circuited state to the connected state, the control method is to control the bypass switch (0 1) to change the second light source unit (2 2) from the short-circuited state to the connected state. Before switching, it has the step of switching the magnitude of the output current (1).

[0173] According to the control method of the fourteenth aspect, the first target value (丨11) of the output current (I1) in the short-circuited state is the second target value of the output current (丨1) in the connected state. Even if the output current is larger than (1 1 2), the second light source unit (2 2) can be short-circuited before switching the magnitude of the output current (1). As a result, it is possible to prevent the overcurrent from flowing through the second light source section (22).

[0174] Further, according to the control method of the fourteenth aspect, the first target value ([11]) of the output current (11) in the short-circuited state is the second target value of the output current ([1]) in the connected state. Even if it is larger than the target value (1 1 2), it is not 〇 2020/175072 42 卩 (：171? 2020 /004472

It is possible to suppress the flow of current.

[0175] In the control method according to the fifteenth aspect, in the fourteenth aspect, the light source unit (10) is connected in series to the first light source unit (21) and the second light source unit (22). The light source further includes a third light source section (23). The control method is such that when the state of the third light source unit (2 3) is switched from the connection state of the third light source unit (2 3) to the short-circuit state of the third light source unit (2 3), the third light source unit (2 3) 3) The third light source (2 3) is connected to the third light source (2 3) by controlling the third light source bypass switch (third bypass switch 〇 1 3) electrically connected in parallel to After switching from the third light source unit (23) to the short-circuited state, the method further includes the step of switching the magnitude of the output current (1). The connection state of the third light source unit (23) is such that the third light source unit (23) is electrically connected to at least one of the first light source unit (21) and the second light source unit (22). The output current (11) flows through the third light source (23). The short-circuited state of the third light source section (23) is a state in which the third light source section (23) is electrically short-circuited. When the third light source (2 3) can be switched from the short-circuited state of the third light source (2 3) to the connected state of the third light source (2 3), the control method is to use the bypass switch for the third light source. Before controlling and switching the third light source (2 3) from the short-circuited state of the third light source (2 3) to the connected state of the third light source (2 3), the magnitude of the output current (1) Further has a step of switching.

[0176] According to the control method of the fifteenth aspect, the target value of the output current (丨1) in the short-circuited state of the third light source section (23) is the connection state of the third light source section (23). Even when the output current (1) is larger than the target value, it is possible to suppress the overcurrent from flowing into the third light source section (23).

[0177] The control device (control unit 4) according to the sixteenth aspect controls the power conversion unit (3) and the bypass switch (O1). The power converter (3) outputs an output current (1) to a light source unit (1 0) including a first light source (2 1) and a second light source (2 2) electrically connected in series. To output power. The bypass switch (○ 1) is electrically connected in parallel to the second light source unit (22). The switch control unit (42) controls the bypass switch (○ 1). Power control unit 〇 2020/175072 43 卩 (: 171-1? 2020 /004472

(4 1) controls the power converter (3). The power control unit (4 1) controls the bypass switch (0 1) by the switch control unit (4 2) when the state of the second light source unit (2 2) is switched from the connected state to the short-circuited state. After switching the second light source (22) from the connected state to the short-circuited state, it has the function of switching the magnitude of the output current (1). In the connected state, the second light source unit (2 2) is electrically connected to the first light source unit (21) and the output current (I 1) flows through the second light source unit (2 2 ). The short-circuited state is a state in which the second light source section (22) is electrically short-circuited. The power control unit (4 1) controls the bypass switch (0 1) by the switch control unit (4 2) when the second light source unit (2 2) is switched from the short-circuited state to the connected state. 2 It has the function of switching the magnitude of the output current (1) before switching the light source (22) from the short-circuited state to the connected state.

[0178] According to the control device (control section 4) of the sixteenth aspect, the first target value of the output current (丨1) in the short-circuited state is the second target value of the output current (丨1) in the connected state. Even if it is larger than the standard value, the second light source unit (22) can be short-circuited before switching the magnitude of the output current (1). As a result, it is possible to prevent overcurrent from flowing through the second light source section (22).

[0179] Also, according to the control device of the sixteenth aspect, the first target value (丨11) of the output current (11) in the short-circuited state is the second target value of the output current (丨1) in the connected state. Even if it is larger than the target value (1 1 2), it is possible to suppress the overcurrent from flowing into the second light source unit (2 2 ).

[0180] In the control device (control unit 4) according to the seventeenth aspect, in the sixteenth aspect, the light source unit (10) includes the first light source unit (21) and the second light source unit (2). 2) further includes a third light source section (23) connected in series. The switch control unit (42) controls the third light source unit bypass switch (third bypass switch 0 13) electrically connected in parallel to the third light source unit (23). The power control unit (4 1) controls the switch when the state of the third light source unit (2 3) is switched from the connection state of the third light source unit (2 3) to the short-circuit state of the third light source unit (2 3). Section (42) controls the bypass switch for the third light source section to turn the third light source section (23) into the third light source section (23). 〇 2020/175072 44 卩 (: 171-1? 2020 /004472

It has a function to switch the magnitude of the output current (1) after switching from the connection state of 3) to the short-circuited state of the third light source (23). The connection state of the third light source unit (23) is such that the third light source unit (23) is electrically connected to at least one of the first light source unit (21) and the second light source unit (22). The output current (1) flows through the third light source (23). The short-circuit state of the third light source unit (23) is a state in which the third light source unit (23) is electrically short-circuited. The power control unit (4 1) switches the switch control unit (3) when the third light source unit (2 3) is switched from the short-circuited state of the third light source unit (2 3) to the connected state of the third light source unit (2 3). 4 2) controls the bypass switch for the third light source unit to switch the third light source unit (2 3) from the short-circuited state of the third light source unit (2 3) to the connected state of the third light source unit (2 3). Previously, it also has a function to switch the size of the output current (1).

[0181] According to the control device (control unit 4) of the seventeenth aspect, the target value of the output current (丨1) in the short-circuited state of the third light source unit (23) is the third light source unit (23). Even if the output current in the connected state of () is larger than the target value of (1), it is possible to suppress overcurrent from flowing into the third light source section (23). Explanation of symbols

[0182] 1 lighting device

2 1 1st light source

2 2 2nd light source

2 3 3rd light source

3 Power converter

4 Control unit (control device)

4 1 Power control section

4 2 Switch control section

1 0 Light source unit

1 0 0 light fixture

1 0 1 housing

2 0 0 vehicle 〇 2020/175072 45 卩 (: 171-1? 2020 /004472

201 car body

〇1 Bypass switch

01 1 1st bypass switch

01 3 3rd bypass switch (Bypass switch for 3rd light source) I 1 Output current

1 1 1, 1 1 4 1st target value

1 1 2, 1 1 5, 1 1 6 2nd target value

I 1 3 3rd target value

Claims

〇 2020/175072 46 卩(：171? 2020/004472 Claims

[Claim 1] A power converter that outputs an output current to supply power to a light source unit including a first light source unit and a second light source unit that are electrically connected in series to each other, and to the second light source unit. A bypass switch electrically connected in parallel, a switch control unit for controlling the bypass switch,

A power control unit for controlling the power conversion unit,

The power conversion unit,

The size of the output current is switched according to the on/off state of the bypass switch to supply power to the light source unit,

The power control unit,

From the connection state in which the second light source unit is electrically connected to the first light source unit and the output current flows to the second light source unit, the state of the second light source unit is Is switched to a short circuit state in which the output current of the output current is changed after the switch control section controls the bypass switch to switch the second light source section from the connection state to the short circuit state. A lighting device having a function of switching the size.

[Claim 2] The power control unit

When the second light source unit is switched from the short-circuit state to the connection state, before the switch control unit controls the bypass switch to switch the second light source unit from the short-circuit state to the connection state, The lighting device according to claim 1, further comprising a function of switching the magnitude of the output current.

3. The lighting device according to claim 2, wherein in the connected state, the bypass switch is in an off state, and in the short-circuited state, the bypass switch is in an on state.

[Claim 4] The switch control unit

When switching the second light source unit from the connected state to the short-circuited state 〇 2020/175072 47 卩(：171? 2020/004472

Control the bypass switch so that the bypass switch changes from the off state to the on state,

The power control unit,

When the second light source unit is switched from the connected state to the short-circuited state, the switch control unit switches the bypass switch from the OFF state to the ON state, and then switches the magnitude of the output current.

The lighting device according to claim 3.

[Claim 5] The switch control unit

When switching the second light source unit from the short-circuited state to the connected state, controlling the bypass switch so that the bypass switch changes from the on state to the off state,

The power control unit,

When the second light source unit is switched from the short-circuited state to the connected state, the switch control unit switches the magnitude of the output current before switching the bypass switch from the ON state to the OFF state,

The lighting device according to claim 3 or 4.

[Claim 6] The power control unit is

Prior to the switching of the bypass switch, the current value of the output current is the smaller of the first target value of the output current in the short-circuited state and the second target value of the output current in the connected state. Current value of

The current value of the output current after the switching of the bypass switch is the target value of the output current in the state of the second light source unit after switching, among the first target value and the second target value.

The lighting device according to any one of claims 1 to 3.

[Claim 7] The power control unit 〇 2020/175072 48 卩 (: 171-1? 2020 /004472

Before the switching of the bypass switch, the current value of the output current is smaller than both the first target value of the output current in the short circuit state and the second target value of the output current in the connected state. The current value of the output current after the switching of the bypass switch is the target value of the output current in the state of the second light source unit after switching among the first target value and the second target value. To do

The lighting device according to any one of claims 1 to 3.

8. A first bypass switch electrically connected in parallel to the first light source unit,

The first bypass switch is separate from the second bypass switch, which is the bypass switch electrically connected in parallel to the second light source unit.

The switch control unit controls the first bypass switch, and the power conversion unit includes:

The magnitude of the output current is switched according to the on/off state of the first bypass switch to supply power to the light source unit, and the power control unit is

From the first state in which the first light source unit is electrically connected to the second light source unit and the output current flows in the first light source unit, When the section is electrically short-circuited, the switch control section controls the first bypass switch to switch the first light source section from the first state to the second state. The lighting device according to claim 1, further comprising a function of switching the magnitude of the output current.

[Claim 9] The power control unit

When the first light source unit is switched from the second state to the first state, the switch control unit controls the first bypass switch to move the first light source unit from the second state to the first state. Before switching to 〇 2020/175072 49 卩 (：171? 2020 /004472

It further has a function of switching the magnitude of the output current,

The lighting device according to claim 8.

10. The light source unit further includes a third light source unit serially connected to the first light source unit and the second light source unit,

A third light source part bypass switch electrically connected in parallel to the third light source part;

The switch control unit controls the third light source unit bypass switch,

The power conversion unit,

Power is supplied to the light source unit by switching the magnitude of the output current according to the on/off state of the third light source unit/pass switch.

The power control unit,

The state of the third light source unit is a connection state in which the third light source unit is electrically connected to at least one of the first light source unit and the second light source unit, and the output current flows through the third light source unit. From the above, when the third light source section is electrically short-circuited, the switch control section controls the third light source section bypass switch to move the third light source section to the third light source. Further has a function of switching the magnitude of the output current after switching from the connection state of the section to the short-circuited state of the third light source section,

The lighting device according to any one of claims 1 to 9.

[Claim 11] The power control unit

When the third light source unit is switched from the short-circuited state of the third light source unit to the connection state of the third light source unit, the switch control unit controls the bypass switch for the third light source unit, and Before switching the third light source unit from the short-circuited state of the third light source unit to the connected state of the third light source unit, further having a function of switching the magnitude of the output current, 〇 2020/175072 50 卩 (：171? 2020 /004472

The lighting device according to claim 10.

[Claim 12] The lighting device according to any one of claims 1 to 11,

The first light source unit,

The second light source unit,

A housing that houses the first light source unit and the second light source unit,

Light fixture.

[Claim 13] The lamp according to claim 12,

A vehicle body on which the lamp is mounted,

vehicle.

[Claim 14] A power converter that outputs an output current and supplies power to a light source unit including a first light source unit and a second light source unit that are electrically connected in series to each other, and to the second light source unit. A control method for controlling a bypass switch electrically connected in parallel,

From the connection state in which the second light source unit is electrically connected to the first light source unit and the output current flows in the second light source unit, the state of the second light source unit is When switching to a short-circuited state in which the output current is switched to a short-circuited state, after switching the second light source unit from the connection state to the short-circuited state by controlling the bypass switch, a step of switching the magnitude of the output current,

When the second light source unit is switched from the short-circuited state to the connected state, the magnitude of the output current is controlled before controlling the bypass switch to switch the second light source unit from the short-circuited state to the connected state. And a step of switching

Control method.

15. The light source unit further includes a third light source unit serially connected to the first light source unit and the second light source unit,

The state of the third light source unit is such that the third light source unit 〇 2020/175072 51 卩(：171? 2020/004472

The connection state, in which the output current flows through the third light source section and is electrically connected to at least one of the second light source sections, is switched to a short-circuit state in which the third light source section is electrically short-circuited. In this case, by controlling the third light source unit/pass switch electrically connected in parallel to the third light source unit, the third light source unit is moved from the connection state of the third light source unit to the third light source unit. Switching the magnitude of the output current after switching to the short-circuited state,

When the third light source unit is switched from the short-circuited state of the third light source unit to the connected state of the third light source unit, the third light source unit bypass switch is controlled to set the third light source unit to the third state. 15. The control method according to claim 14, further comprising: switching the magnitude of the output current before switching from the short-circuited state of the three light source units to the connected state of the third light source unit.

[Claim 16] A power converter that outputs an output current and supplies power to a light source unit that includes a first light source unit and a second light source unit that are electrically connected in series to each other, and to the second light source unit. A bypass switch electrically connected in parallel, and a control device for controlling

A switch control unit for controlling the bypass switch,

A power control unit for controlling the power conversion unit,

The power control unit,

From the connection state in which the second light source unit is electrically connected to the first light source unit and the output current flows to the second light source unit, the state of the second light source unit is Is electrically short-circuited, the switch control unit controls the bypass switch to switch the second light source unit from the connected state to the short-circuited state. A function to switch the size,

When the second light source unit is switched from the short-circuited state to the connected state, the switch control unit controls the bypass switch to 〇 2020/175072 52 卩 (: 171-1? 2020 /004472

A control device having a function of switching the magnitude of the output current before switching the second light source unit from the short-circuited state to the connected state.

17. The light source unit further includes a third light source unit connected in series with the first light source unit and the second light source unit,

The switch control unit controls a third light source unit bypass switch electrically connected in parallel to the third light source unit,

The power control unit,

The state of the third light source unit is a connection state in which the third light source unit is electrically connected to at least one of the first light source unit and the second light source unit, and the output current flows through the third light source unit. From the above, when the third light source unit is switched to a short-circuit state in which the third light source unit is electrically short-circuited, the switch control unit controls the third light source unit bypass switch to move the third light source unit to the third light source. The function of switching the magnitude of the output current after switching from the connection state of the third light source section to the short circuit state of the third light source section, and the third light source section from the short circuit state of the third light source section to the third section. When the light source section is switched to the connection state, the switch control section controls the third light source section bypass switch to move the third light source section from the shorted state of the third light source section to the third light source. The control device according to claim 16, further comprising: a function of switching a magnitude of the output current before switching to the connection state of the unit.