JP7133794B2 - Lighting device, lighting equipment and vehicle equipped with the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lighting device, a lighting fixture, and a vehicle including the same, and more particularly to a lighting device, a lighting fixture, and a vehicle having the function of changing output according to temperature.

Conventionally, there has been an LED module that includes multiple light-emitting diodes, a temperature-sensing part that is arranged so that the heat generated by the light-emitting diodes acts on it, and a protection circuit that is connected in parallel with some of the light-emitting diodes ( For example, see Patent Document 1). In the LED module described in Patent Document 1, when the temperature sensed by the temperature sensing part exceeds a predetermined threshold temperature, the protection circuit is short-circuited to turn off some of the light emitting diodes, thereby turning off the light emitting diodes. Reduced heat generation.

JP 2012-133938 A

In the above-described LED module, if an abnormality occurs in the temperature detection function due to an abnormality in the temperature sensing part or the like, the protection circuit may not operate normally, and control may become abnormal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lighting device, a lighting fixture, and a vehicle equipped with the same, which are less likely to be subjected to abnormal control even when an abnormality occurs in the temperature detection function.

A lighting device of one embodiment of the present invention includes a power conversion unit that converts input power and outputs the converted power to a light source, and a control unit that controls the output of the power conversion unit. The control section has a first input section and a second input section. A first measurement value is input to the first input unit from a first temperature sensing unit that measures an internal temperature of a lighting device main body that houses at least the power conversion unit and the control unit. A second measurement value is input to the second input unit from a second temperature sensing unit that measures the temperature of the light source. When the control unit determines that both the first measured value and the second measured value are not abnormal values, one of the first measured value and the second measured value exceeds a predetermined threshold and control to suppress the output value of the power conversion unit. When the controller determines that at least one of the first measured value and the second measured value is an abnormal value, the control unit changes the output value of the power conversion unit to the temperature of the main body of the lighting device and the temperature of the light source. The output value is controlled to be different from the output value determined based on the first measured value and the second measured value regardless of the temperature. The controller determines that the first measured value or the second measured value is an abnormal value when the temperature difference between the first measured value and the second measured value is equal to or greater than a predetermined criterion.
A lighting device of one embodiment of the present invention includes a power conversion unit that converts input power and outputs the converted power to a light source, and a control unit that controls the output of the power conversion unit. The control section has a first input section and a second input section. A first measurement value is input to the first input unit from a first temperature sensing unit that measures an internal temperature of a lighting device main body that houses at least the power conversion unit and the control unit. A second measurement value is input to the second input unit from a second temperature sensing unit that measures the temperature of the light source. When the control unit determines that both the first measured value and the second measured value are not abnormal values, one of the first measured value and the second measured value exceeds a predetermined threshold and control to suppress the output value of the power conversion unit. When the controller determines that at least one of the first measured value and the second measured value is an abnormal value, the control unit changes the output value of the power conversion unit to the temperature of the main body of the lighting device and the temperature of the light source. The output value is controlled to be different from the output value determined based on the first measured value and the second measured value regardless of the temperature. The controller determines that the first measured value or the second measured value is an abnormal value when the temperature difference between the first measured value and the second measured value is equal to or greater than a predetermined criterion. The control unit controls the output of the power conversion unit to a constant value when determining that at least one of the first measured value and the second measured value is an abnormal value. The constant value is smaller than the output value when both the first measured value and the second measured value are not abnormal values.

A lighting fixture according to one aspect of the present invention includes the lighting device and a fixture body that holds the lighting device.

A vehicle according to one aspect of the present invention includes the lighting device and a vehicle body to which the lighting device is attached.

ADVANTAGE OF THE INVENTION According to this invention, the lighting device, lighting fixture, and vehicle provided with the same which are hard to perform abnormal control even when abnormality occurs in the temperature detection function are provided.

FIG. 1 is a circuit diagram of a lighting device according to Embodiment 1. FIG. FIG. 2A is a graph showing the relationship between temperature and output of the same lighting device. FIG. 2B is a graph showing the relationship between light source temperature and output. 3A is a graph showing the relationship between temperature and output of the lighting device according to Embodiment 2. FIG. FIG. 3B is a graph showing the relationship between light source temperature and output. FIG. 4 is a circuit diagram of a lighting device according to Embodiment 3. FIG. FIG. 5A is a graph showing the relationship between temperature and output of the same lighting device. FIG. 5B is a graph showing the relationship between light source temperature and output. FIG. 6 is a circuit diagram of a lighting device according to Embodiment 4. FIG. FIG. 7 is a cross-sectional view of a lighting fixture according to Embodiment 5. FIG. FIG. 8 is a perspective view of a vehicle according to Embodiment 6. FIG.

The embodiment described below is but one of the various embodiments of the present invention. Embodiments of the present invention are not limited to the following embodiments, and may include other embodiments. Further, the embodiments described below can be modified in various ways according to design and the like without departing from the technical idea of the present invention.

(Embodiment 1)
A lighting device 1 according to Embodiment 1 is used to light a light source unit 100 as shown in FIG. The lighting device 1 of this embodiment is used to light a light source unit 100 provided in a vehicle such as an automobile.

The lighting device 1 includes a power conversion section 10, a control section 20, and a first temperature sensing section 30, as shown in FIG. The lighting device 1 also includes a voltage measuring section 40 that measures the output voltage and a current measuring section 50 that measures the output current.

First, the light source unit 100 that is lit by the lighting device 1 will be described.

The light source unit 100 includes a light source 110 and a second temperature sensing section 120 . The light source 110 consists of a semiconductor light emitting device such as an LED. The light source 110 consists of, for example, a plurality of LEDs, and the plurality of LEDs are connected in series or in parallel. The second temperature sensing part 120 measures the temperature of the light source 110 . Here, the "temperature of the light source" is not limited to the temperature of the light source itself, but includes the temperature around the light source. In addition, in this embodiment, the second temperature sensing section 120 measures the temperature around the light source 110 .

Next, the configuration of each part of the lighting device 1 will be described.

The power converter 10 is composed of, for example, a step-up DC-DC converter circuit. The power converter 10 converts the voltage value of the DC voltage input from the DC power source E1 via the power switch SW1, and outputs the converted value to the light source 110 of the light source unit 100. FIG. The DC power source E1 is, for example, a vehicle battery, but may be an AC-DC inverter circuit that rectifies and smoothes the AC voltage of the AC power source and converts it into a DC voltage.

The voltage measurement section 40 includes a series circuit of resistors R1 and R2 connected between the output terminals of the power conversion section 10 . A voltage obtained by dividing the output voltage of the power conversion unit 10 by the resistors R1 and R2 is input to the control unit 20 .

The current measurement unit 50 includes a resistor R3 connected in series between the light source 110 and the power conversion unit 10. As shown in FIG. A voltage across the resistor R3 is input to the controller 20 .

The control unit 20 has the functions of a first input unit 21 , a second input unit 22 , an abnormality determination unit 23 , an output setting unit 24 and an output control unit 25 . The control unit 20 also includes a memory 26 . The control unit 20 of this embodiment includes a microcomputer. The functions of the control unit 20 are realized by the CPU (Central Processing Unit) of the microcomputer executing a program stored in the memory 26 . Here, the program executed by the CPU of the microcomputer may be stored in advance in the memory 26 when the lighting device 1 is shipped from the factory, may be recorded in a storage medium such as a memory card, and may be provided. It may be provided through a communication line.

The first input unit 21 receives data from a first temperature sensing unit 30 that measures the internal temperature of a lighting device main body 70 (see FIG. 7 ) housing at least the power conversion unit 10 and the control unit 20 , that is, the temperature of the lighting device 1 . 1 measurement is entered. The first temperature sensing unit 30 is a temperature sensing element such as a thermistor, mounted on a substrate on which a circuit such as the power conversion unit 10 is mounted, and measures the internal temperature of the lighting device main body 70 . Here, the "internal temperature of the main body of the lighting device" is the temperature at an arbitrary position inside the main body of the lighting device 70. For example, the temperature may be measured in the vicinity of a circuit component that generates a relatively large amount of heat.

A second measurement value is input to the second input unit 22 from the second temperature sensing unit 120 that measures the temperature of the light source 110 . The second temperature sensing part 120 is a temperature sensing element such as a thermistor, mounted on a substrate on which a light emitting diode as the light source 110 is mounted, and measures the temperature around the light source 110 . Although the temperature around the light source 110 is measured by the second temperature sensing part 120 in this embodiment, the temperature of the light source 110 may be measured directly.

The abnormality determination unit 23 determines whether the first measurement value input to the first input unit 21 and the second measurement value input to the second input unit 22 are abnormal values. Here, when the first measured value is an abnormal value, it means that the first temperature sensing part 30 or the circuit to which the first measured value is input from the first temperature sensing part 30 has a failure or disconnection of a circuit component. This means that the first measured value becomes an abnormal value far from the internal temperature of the lighting device main body 70 . Similarly, when the second measured value is an abnormal value, it means that the second temperature sensing unit 120 or the circuit to which the second measured value is input from the second temperature sensing unit 120 has a failure of a circuit component, a disconnection, or the like. This means that the second measured value becomes an abnormal value far from the temperature of the light source 110 . Therefore, if the first measured value and the second measured value are normally measured values, even if the first measured value and the second measured value are outside the operating temperature range of the lighting device 1 and the light source 110, the The 1st and 2nd measurements are not outliers. Further, hereinafter, the fact that the first measured value or the second measured value has become an abnormal value is also referred to as the occurrence of a measurement abnormality.

For example, when the first measurement value input to the first input unit 21 is outside the predetermined first temperature range, the abnormality determination unit 23 determines that the first measurement value is an abnormal value. Here, the predetermined first temperature range means the first temperature sensing portion 30 and the circuit (the first input portion 21, the first input portion 21 and the first It is a value that the first measurement value can take when the electric wire connecting to the temperature sensing part 30, etc.) functions normally. In this embodiment, the first temperature range is set to, for example, a temperature range from (-40)° C. to 135° C., and the abnormality determination unit 23 determines whether the first measured value is (-40)° C. or less, or If the first measured value is 135° C. or higher, it is determined as an abnormal value.

Further, when the second measured value input to the second input unit 22 is outside the predetermined second temperature range, the abnormality determination unit 23 determines that the second measured value input to the second input unit 22 is an abnormal value. I judge. Here, the predetermined second temperature range means the second temperature sensing portion 120 and the circuit to which the second measured value of the second temperature sensing portion 120 is input (the second input portion 22, the second input portion 22 and the second temperature sensing portion 22). This is a value that the second measured value can take when the electric wire connecting to the temperature sensing part 120, etc.) functions normally. In the present embodiment, the second temperature range is set to a temperature range from (-40)° C. to 135° C., and the abnormality determination unit 23 determines whether the second measured value is (-40)° C. or less, or If the second measured value is 135° C. or higher, it is determined as an abnormal value.

In the comparison between two values such as temperature, "greater than or equal to" includes both the case where the two values are equal and the case where one of the two values exceeds the other. However, the term "greater than or equal to" as used herein may be synonymous with "greater than" which includes only the case where one of the two values exceeds the other. That is, whether the two values are equal can be arbitrarily changed depending on the setting of the reference value, etc., so there is no technical difference between "greater than" and "greater than". Similarly, "less than" may have the same meaning as "less than", and there is no technical difference between "less than" and "less than".

The memory 26 is an electrically rewritable non-volatile memory such as EEPROM (Electrically Erasable and Programmable Read-Only Memory). The memory 26 stores programs executed by the CPU of the microcomputer, output characteristic data indicating the relationship between the temperature of the lighting device 1 and the temperature of the light source 110, and the output value of the power converter 10, and the like.

Here, FIG. 2A shows the relationship between the temperature of the lighting device 1 and the output value of the power conversion unit 10, and the output of the power conversion unit 10 is expressed as a percentage when the rated output to the light source 110 is 100%. is represented. In FIG. 2A, the dotted line indicates the output characteristic when the first measured value is not an abnormal value (hereinafter referred to as "normal output characteristic"). In the normal output characteristics, when the temperature of the lighting device 1 is equal to or lower than the temperature T11, the set value of the output of the power converter 10 is set to 100%. In the range where the temperature of the lighting device 1 is higher than the temperature T11 and equal to or lower than the temperature T12, the set value of the output of the power conversion unit 10 is set so that the output monotonously decreases as the temperature rises. When the temperature of the lighting device 1 becomes higher than the temperature T12, the set value of the output of the power conversion section 10 becomes V1 (%). Further, in FIG. 2A , the output characteristics when the first measured value is an abnormal value (hereinafter referred to as “abnormal output characteristics”) are illustrated by solid lines. Regardless of the temperature, the set value of the output of the power converter 10 is V1 (%). Here, it is preferable that the set value V1 is set to an output value such that the temperatures of the lighting device 1 and the light source 110 are within the allowable range even when the ambient temperature rises.

On the other hand, FIG. 2B shows the relationship between the temperature of the light source 110 and the output value of the power conversion unit 10, and the output of the power conversion unit 10 is expressed as a percentage when the rated output to the light source 110 is 100%. ing. In FIG. 2B, the output characteristics in the normal state are indicated by dotted lines. In the normal output characteristic, when the temperature of the light source 110 is equal to or lower than the temperature T21, the set value of the output of the power converter 10 is set to 100%. In the range where the temperature of light source 110 is higher than temperature T21 and equal to or lower than temperature T22, the set value of the output of power conversion section 10 is set so that the output monotonically decreases as the temperature rises. When the temperature of light source 110 becomes higher than temperature T22, the set value of the output of power conversion section 10 becomes V2 (%). In FIG. 2B, the output characteristic at the time of abnormality is illustrated with a solid line. In the abnormal output characteristic, regardless of the temperature of the lighting device 1, the set value of the output of the power conversion unit 10 is V2 (%). Here, the set value V2 is preferably set to an output value that keeps the temperatures of the lighting device 1 and the light source 110 within the allowable range even when the ambient temperature rises.

The output setting unit 24 reduces the output at high temperatures based on the first and second measured values when the abnormality determination unit 23 does not determine that the first and second measured values are abnormal values. is set to the output value of the power conversion unit 10 . The output setting unit 24 sets the output of the power conversion unit 10 to the set value V1 when the abnormality determination unit 23 determines that the first measured value is an abnormal value. The output setting unit 24 sets the output of the power conversion unit 10 to the set value V2 when the abnormality determination unit 23 determines that the second measured value is an abnormal value. The output setting unit 24 sets the output of the power conversion unit 10 to the smaller one of the set values V1 and V2 when the abnormality determination unit 23 determines that both the first measured value and the second measured value are abnormal values. . Note that if the set values V1 and V2 are the same value, the output setting unit 24 reduces the output of the power conversion unit 10 when the abnormality determination unit 23 determines that both the first measured value and the second measured value are abnormal values. Set to the set value V1 (=V2).

The output control unit 25 controls the on-duty of the switching element included in the power conversion unit 10 so that the output of the power conversion unit 10 matches the set value set by the output setting unit 24 .

Next, the operation of the lighting device 1 of this embodiment will be described.

When the power switch SW1 is turned on and power is supplied from the DC power supply E1 to the lighting device 1, the lighting device 1 starts operating. The control unit 20 has a communication function to communicate with an external device, for example, an ECU (Electronic Control Unit) of the vehicle. lights out.

Upon receiving a lighting command to light the light source unit 100 from the ECU, the control unit 20 controls the power conversion unit 10 to supply a predetermined output to the light source 110, thereby lighting the light source 110 with the preset output. do. Further, the control unit 20 monitors the internal temperature of the lighting device main body 70 and the temperature of the light source 110, and when either the internal temperature of the lighting device main body 70 or the temperature of the light source 110 becomes high, the output of the power conversion unit 10 is increased. take action to suppress The operation of the controller 20 when lighting the light source unit 100 will be described below.

The first input unit 21 of the control unit 20 periodically receives the first measured value from the first temperature sensing unit 30, and the second input unit 22 of the control unit 20 periodically receives the second measured value from the second temperature sensing unit 120. take it in. When the first measured value is input from the first temperature sensing portion 30 to the first input portion 21 of the control portion 20 and the second measured value is input from the second temperature sensing portion 120 to the second input portion 22, an abnormality is determined. The unit 23 determines whether each of the first measured value and the second measured value is an abnormal value. Here, if the first measured value is within the first temperature range and the second measured value is within the second temperature range, the abnormality determination unit 23 determines that the first measured value and the second measured value are not abnormal values. I judge. On the other hand, the abnormality determining unit 23 determines that the first measured value is abnormal when the first measured value is outside the first temperature range, and determines that the second measured value is abnormal when the second measured value is outside the second temperature range. It is judged to be an abnormal value.

Output setting unit 24 sets the output value of power conversion unit 10 according to the determination result of abnormality determination unit 23 .

When the abnormality determination unit 23 determines that the first measured value and the second measured value are not abnormal values, the output setting unit 24 determines the normal value of FIG. 2A obtained from the memory 26 based on the first measured value. A candidate value (hereinafter referred to as a first candidate value) for the output of the power conversion unit 10 is obtained according to the output characteristics of the time. Further, based on the second measured value, the output setting unit 24 selects a candidate value for the output of the power conversion unit 10 (hereinafter referred to as a second candidate value) according to the normal output characteristics of FIG. 2B acquired from the memory 26. ). The output setting unit 24 compares the magnitudes of the first candidate value and the second candidate value, and sets the smaller one of the first candidate value and the second candidate value as the set value for the output of the power conversion unit 10 . If the first candidate value and the second candidate value are the same value, the output setting unit 24 sets the first candidate value (second candidate value) as the output setting value of the power conversion unit 10 .

When the abnormality determination unit 23 determines that the first measured value is an abnormal value, the output setting unit 24 sets the output of the power conversion unit 10 to the set value V1.

When the abnormality determination unit 23 determines that the second measured value is an abnormal value, the output setting unit 24 sets the output of the power conversion unit 10 to the set value V2.

Further, when the abnormality determination unit 23 determines that both the first measured value and the second measured value are abnormal values, the output setting unit 24 sets the output of the power conversion unit 10 to a value that is smaller than the set value V1 and the set value V2. direction. Note that when the set value V1 and the set value V2 are the same value, the output setting unit 24 sets the output of the power conversion unit 10 to the set value V1 (the set value V2).

Then, the output control unit 25 controls the on-duty of the switching element included in the power conversion unit 10 so that the output of the power conversion unit 10 matches the setting value set by the output setting unit 24 . In this embodiment, the output voltage measured by the voltage measuring section 40 and the output current measured by the current measuring section 50 are fed back to the control section 20 . Based on the output voltage and the output current, the control unit 20 controls the on-duty of the switching element so that the output of the power conversion unit 10 matches the set value set by the output setting unit 24 .

Thus, when either the first measured value or the second measured value becomes an abnormal value, the control unit 20 treats the output of the power conversion unit 10 as the first measured value input to the first input unit 21. The output value is controlled to be different from the output value determined based on the second measurement value input to the second input section 22 . Therefore, the output value of the power conversion unit 10 is not controlled to the output value determined based on the first measured value or the second measured value determined to be an abnormal value, and an abnormality occurs in the temperature detection function. Abnormal control is less likely to be performed even when Moreover, even if either the first measured value or the second measured value is an abnormal value, the lighting device 1 can turn on the light source 110, so that a desired range can be illuminated.

Note that when the abnormality determination unit 23 determines that the first measured value and the second measured value are not abnormal values, the temperature of the lighting device 1 is equal to or lower than the temperature T11 and the temperature of the light source 110 is equal to or lower than the temperature T21. When below, the control section 20 controls the output of the power conversion section 10 to the output value of 100%. On the other hand, when the abnormality determination unit 23 determines that the first measured value and the second measured value are not abnormal values, the temperature of the lighting device 1 exceeds the temperature T11 or the temperature of the light source 110 exceeds the temperature T21. If exceeded, the control unit 20 reduces the output of the power conversion unit 10 . Accordingly, when the first measured value or the second measured value exceeds the predetermined threshold (temperature T11, T21), the control unit 20 controls to suppress the output of the power conversion unit 10, and the lighting device 1 Also, the temperature rise of the light source 110 is suppressed.

Further, in the present embodiment, when the abnormality determination unit 23 determines that there is a measurement abnormality, the control unit 20 sets the output of the power conversion unit 10 to a constant output value regardless of the temperature of the lighting device 1 or the temperature of the light source 110. Control. Therefore, the output value of the power conversion unit 10 is not controlled to the output value determined based on the first measured value or the second measured value determined to be an abnormal value, and an abnormality occurs in the temperature detection function. Abnormal control is less likely to be performed even when

Below, the lighting device 1 according to the modified example of the first embodiment is listed. It should be noted that each configuration of the modification described below can be applied in appropriate combination with each configuration described in the above embodiment.

When a measurement abnormality occurs, the output setting unit 24 sets the output of the power conversion unit 10 to the minimum value of the output when the first measured value and the second measured value are not abnormal values (V1 or V2, whichever is smaller) method) may be set to a smaller output value. This further suppresses the temperature rise of the lighting device 1 and the light source 110 when a measurement abnormality occurs.

If the first measured value is outside the first temperature range, the abnormality judgment unit 23 judges that the first measurement value is an abnormal value, and if the second measurement value is outside the second temperature range, the second measurement value Although it is determined that the value is an abnormal value, the first temperature range and the second temperature range may be changed according to the output of the power converter 10 . It is assumed that the larger the output value of the power conversion unit 10 is, the more heat is generated in the lighting device 1 and the light source 110 . 2 The temperature range may vary. For example, the abnormality determination unit 23 may shift the first temperature range and the second temperature range to higher temperatures as the output value of the power conversion unit 10 increases. Further, as the output value of the power conversion unit 10 increases, the abnormality determination unit 23 increases the upper limit values of the first temperature range and the second temperature range so that the first temperature range and the second temperature range are widened to the high temperature side. may be changed. Thereby, the abnormality judgment part 23 can more reliably judge whether the first measured value or the second measured value is an abnormal value.

Further, the abnormality determination section 23 may determine whether or not the first measured value and the second measured value are abnormal values not only while the light source unit 100 is turned on but also while the light source unit 100 is turned off. . That is, even when the light source unit 100 is turned off, if the first measured value is outside the first temperature range, the abnormality determination unit 23 determines that the first measured value is an abnormal value, and determines that the second measured value is an abnormal value. 2 outside the temperature range, the second measured value is determined to be an abnormal value. If the abnormality determination unit 23 determines that the first measurement value or the second measurement value is abnormal while the light source unit 100 is turned off, it may cause the light source unit 100 to blink or output a notification signal to an external device. By doing so, it may be notified that the first measured value or the second measured value is an abnormal value.

Here, the first temperature range and the second temperature range may be the same temperature range when the light source unit 100 is turned on and when the light source unit 100 is turned off. may be set to different temperature ranges. It is assumed that the first measured value of the first temperature sensing part 30 and the second measured value of the second temperature sensing part 120 are lower when the light source unit 100 is turned off than when the light source unit 100 is turned on. Therefore, the first temperature range and the second temperature range during lighting may be set to temperature ranges lower than the first temperature range and the second temperature range during lighting. Whether or not the measured value or the second measured value is an abnormal value can be determined more reliably.

Further, when the light source unit 100 is turned off, it is assumed that the temperature of the lighting device 1 and the light source 110 decreases as the turn-off time becomes longer. Therefore, the abnormality determination unit 23 may shift the first temperature range and the second temperature range to the low temperature side as the light-out time of the light source unit 100 is prolonged. Further, the abnormality determination unit 23 may set the first temperature range and the second temperature range such that the upper limit values of the first temperature range and the second temperature range decrease as the turn-off time of the light source unit 100 increases. Thereby, the abnormality judgment part 23 can more reliably judge whether the first measured value or the second measured value is an abnormal value.

In addition, the abnormality determination unit 23 determines that the first measurement value is an abnormal value if the first measurement value is outside the first temperature range, and determines that the second measurement value is an abnormal value if the second measurement value is outside the second temperature range. Although it is determined as an abnormal value, the method of determining whether it is an abnormal value is not limited to this. The abnormality determination unit 23 may determine that the first measurement value or the second measurement value is an abnormal value when the difference between the first measurement value and the second measurement value is equal to or greater than a predetermined criterion. When the abnormality determination unit 23 determines that the first measured value or the second measured value is an abnormal value, the output setting unit 24 sets the output of the power conversion unit 10 to the smaller one of the set values V1 and V2. You can set it.

When the output of power conversion unit 10 is controlled to the rated output while light source 110 is on, it is assumed that the temperature difference between the temperature of lighting device 1 and the temperature of light source 110 is within a certain temperature difference. Therefore, if the temperature difference between the temperature of the lighting device 1 and the temperature of the light source 110 is measured in advance, and a temperature (for example, 50° C.) larger than the temperature difference is set in the memory of the control unit 20 as a judgment criterion. good.

The abnormality determination unit 23 obtains the temperature difference (absolute value) between the first measured value input to the first input unit 21 and the second measured value input to the second input unit 22, and stores this temperature difference in the memory. If it is equal to or greater than the criterion acquired from , it is determined that the first measured value or the second measured value is an abnormal value. If either the first measured value or the second measured value becomes an abnormal value, it is assumed that the temperature difference (absolute value) between the first measured value and the second measured value exceeds the criterion. Therefore, the abnormality determination unit 23 can determine whether the first measured value or the second measured value is an abnormal value based on the temperature difference between the first measured value and the second measured value.

Here, the abnormality determination unit 23 may set different values for the determination criterion while the light source 110 is on and the determination criterion while the light source 110 is extinguished. While the power conversion unit 10 stops power conversion and the light source 110 is turned off, if there is no heat source around the lighting device 1 or the light source 110, the temperature of the lighting device 1 and the temperature of the light source 110 are approximately the same. It is assumed that the temperature Therefore, the determination criteria may be set to 50° C. while the light source 110 is on and 25° C. while the light source 110 is off in the memory of the controller 20 . When the temperature difference between the first measured value and the second measured value reaches 25° C. or more while the light source 110 is turned off, the abnormality determination unit 23 determines that the first measured value or the second measured value is an abnormal value. Therefore, it can be determined more reliably whether the first measured value or the second measured value is an abnormal value.

Further, when the ratio of the second measured value to the first measured value is out of the predetermined range, the abnormality determination section 23 may determine that the first measured value or the second measured value is an abnormal value.

In addition, when the abnormality determination unit 23 determines whether the value is an abnormality based on the temperature difference (absolute value) between the first measurement value and the second measurement value or the ratio of the second measurement value to the first measurement value. , it is not possible to determine which of the first measured value and the second measured value is an abnormal value. In this case, the abnormality determination unit 23 further determines whether each of the first measured value and the second measured value is outside the predetermined temperature range. It suffices to determine which is an abnormal value.

Further, when the abnormality determination unit 23 determines that the first measurement value or the second measurement value is an abnormal value based on the temperature difference or ratio between the first measurement value and the second measurement value, the first measurement value It may be determined whether or not an abnormal value is obtained based on the temperature difference between when the light is on and when the light is off. For example, out of the first measured value and the second measured value, the abnormality determination unit 23 may determine that the measured value that changes less between on and off is the abnormal value.

Further, when the abnormality determination unit 23 determines that the first measurement value or the second measurement value is an abnormal value based on the temperature difference or ratio between the first measurement value and the second measurement value, the power conversion unit 10 The amount of change in the first measured value and the second measured value before and after the output of is increased or decreased may be obtained, and the one with the smaller temperature change may be determined as the abnormal value. When the output of the power conversion unit 10 increases or decreases, the heat generation in the lighting device 1 and the light source 110 increases or decreases, so the measured value that is not an abnormal value among the first measured value and the second assumed value increases or decreases. However, it is assumed that the measured values judged to be outliers do not change. Therefore, when the abnormality determination unit 23 determines that the first measurement value or the second measurement value is an abnormal value based on the temperature difference or ratio between the first measurement value and the second measurement value, the power conversion unit 10 The amount of change in the first measured value and the second measured value before and after the output of is increased or decreased is obtained, and the one with the smaller temperature change is judged to be an abnormal value.

(Embodiment 2)
A lighting device 1 according to Embodiment 2 will be described with reference to FIG.

In the lighting device 1 of the present embodiment, when one of the first measured value and the second measured value is determined to be an abnormal value, the output setting unit 24 determines that one of the first measured value and the second measured value is an abnormal value. It is different from the first embodiment in that the output of the power converter 10 is set based on the measurement value that has not been measured. In the following, configurations similar to those of the first embodiment are denoted by common reference numerals, and descriptions thereof are omitted as appropriate. The configuration (including modifications) described in the second embodiment can be applied in appropriate combination with the configuration (including modifications) described in the first embodiment.

In the lighting device 1 of the present embodiment, the memory 26 of the control section 20 stores output characteristics as shown in FIGS. 3A and 3B.

FIG. 3A shows the relationship between the temperature of the lighting device 1 and the output of the power converter 10. The output of the power converter 10 is expressed as a percentage when the rated output to the light source 110 is 100%. . In FIG. 3A, the output characteristics in the normal state are indicated by dotted lines. Since the normal output characteristics are the same as the normal output characteristics shown in FIG. 2A, description thereof will be omitted. In FIG. 3A, the output characteristic at the time of abnormality is illustrated with a solid line. When the temperature of the lighting device 1 is equal to or lower than the temperature T13, the set value of the output of the power conversion section 10 is set to 100%. In the range where the temperature of the lighting device 1 is higher than the temperature T13 and equal to or lower than the temperature T14, the set value of the output of the power conversion section 10 is set so that the output monotonously decreases as the temperature rises. When the temperature of the lighting device 1 becomes higher than the temperature T14, the set value of the output of the power converter 10 becomes V3 (%) (V3<V1). Temperature T13 is lower than temperature T11 (T13<T11), and temperature T14 is higher than temperature T11 and lower than temperature T12 (T11<T14<T12). Here, it is preferable that the output characteristics in an abnormal state are set so that the temperatures of the lighting device 1 and the light source 110 are within the allowable range even when the ambient temperature rises.

FIG. 3B shows the relationship between the temperature of the light source 110 and the output of the power converter 10, and the output of the power converter 10 is expressed as a percentage when the rated output to the light source 110 is 100%. In FIG. 3B, the output characteristics in the normal state are indicated by dotted lines. Since the normal output characteristics are the same as the normal output characteristics shown in FIG. 2B, description thereof will be omitted. In FIG. 3B, the output characteristic at the time of abnormality is illustrated with a solid line. When the temperature of the light source 110 is equal to or lower than the temperature T23, the set value of the output of the power converter 10 is set to 100%. In the range where the temperature of light source 110 is higher than temperature T23 and equal to or lower than temperature T24, the set value of the output of power conversion section 10 is set so that the output monotonically decreases as the temperature rises. When the temperature of light source 110 becomes higher than temperature T24, the set value of the output of power conversion section 10 becomes V2 (%). Temperature T23 is lower than temperature T21 (T23<T21), and temperature T24 is higher than temperature T21 and lower than temperature T22 (T21<T24<T22). Here, it is preferable that the output characteristics in an abnormal state are set so that the temperatures of the lighting device 1 and the light source 110 are within the allowable range even when the ambient temperature rises.

The operation of the lighting device 1 of the present embodiment will be described below, centering on the operation of the output setting section 24 .

Output setting unit 24 sets the output value of power conversion unit 10 according to the determination result of abnormality determination unit 23 .

When the abnormality determination unit 23 determines that the first measured value and the second measured value are not abnormal values, the output setting unit 24 determines the normal output in FIG. 3A obtained from the memory 26 based on the first measured value. A first candidate value is obtained according to the characteristics. Based on the second measured value, the output setting unit 24 obtains the second candidate value according to the normal output characteristic shown in FIG. 3B acquired from the memory 26 . The output setting unit 24 compares the magnitudes of the first candidate value and the second candidate value, and sets the smaller one of the first candidate value and the second candidate value as the output set value.

On the other hand, when the abnormality determination unit 23 determines that the first measured value is an abnormal value, the output setting unit 24, based on the second measured value that is not determined to be an abnormal value, the output setting unit 24 of FIG. The set value of the output is obtained according to the output characteristics at the time of abnormality.

3A obtained from the memory 26 based on the first measured value not determined to be abnormal when the abnormality determination unit 23 determines that the second measured value is an abnormal value. The set value of the output is obtained according to the output characteristics at the time of abnormality.

Then, the output control unit 25 controls the on-duty of the switching element included in the power conversion unit 10 so that the output of the power conversion unit 10 matches the setting value set by the output setting unit 24 .

As described above, when the abnormality determining unit 23 determines that one of the first measured value and the second measured value is an abnormal value, the output setting unit 24 determines that one of the first measured value and the second measured value is an abnormal value. The output value of the power conversion unit 10 is set based on the measured value that is not detected and the output characteristics in the abnormal state.

Here, in the abnormal output characteristic, the set value of the output is set lower at high temperatures than in the normal output characteristic. Therefore, when the output is set based only on the measured value that is not determined to be an abnormal value out of the first measured value and the second measured value, the possibility that the temperatures of the lighting device 1 and the light source 110 become high can be reduced. . For example, when the measured value (second measured value) of the temperature of the light source 110 is determined to be an abnormal value, the output setting unit 24 sets the measured value (first measured value) of the temperature of the lighting device 1 and the temperature shown in FIG. The output of the power converter 10 is set based on the output characteristics at the time of abnormality. Here, in the abnormal output characteristic, the set value of the output at a high temperature (a temperature range higher than the temperature T13) is set lower than in the normal output characteristic. It can reduce the possibility that the temperature will be high.

Further, even when the first measured value or the second measured value is determined to be an abnormal value, the lighting device 1 turns on the light source 110, so that the desired range can be illuminated.

(Embodiment 3)
A lighting device 1 according to Embodiment 3 will be described with reference to FIGS. 4 and 5. FIG.

The lighting device 1 of this embodiment differs from that of the first embodiment in that the control section 20 further includes an estimation section 27 . In the following, configurations similar to those of the first embodiment are denoted by common reference numerals, and descriptions thereof are omitted as appropriate. The configuration (including modifications) described in the third embodiment can be applied in appropriate combination with the configurations (including modifications) described in the first and second embodiments.

In the lighting device 1 of the present embodiment, the memory 26 of the control unit 20 stores the first measured value and the second measured value obtained in a state where both the first measured value and the second measured value are not abnormal values. store a correlation value indicating the correlation of That is, the control unit 20 obtains a correlation value indicating the correlation between the first measured value and the second measured value in a state where neither the first measured value nor the second measured value is an abnormal value, and obtains the correlation value is stored in the memory 26. The controller 20 stores, for example, the difference between the first measured value and the second measured value in the memory 26 as a correlation value.

Also, the memory 26 of the control unit 20 stores output characteristics as shown in FIGS. 5A and 5B. FIG. 5A shows the relationship between the temperature of the lighting device 1 and the output of the power converter 10, and the output of the power converter 10 is expressed as a percentage when the rated output to the light source 110 is 100%. . Since the output characteristics in FIG. 5A are the same as the output characteristics in the normal state shown in FIG. 2A, description thereof will be omitted. FIG. 5B shows the relationship between the temperature of the light source 110 and the output of the power converter 10, and the output of the power converter 10 is expressed as a percentage when the rated output to the light source 110 is 100%. The output characteristics of FIG. 5B are the same as the normal output characteristics shown in FIG. 2B, so description thereof will be omitted.

When the abnormality determination unit 23 determines that one of the first measured value and the second measured value is an abnormal value, the estimating unit 27 compares the other of the first measured value and the second measured value with the correlation value acquired from the memory 26. and one of the first and second measurements is estimated.

The operation of the characteristic portion of the lighting device 1 of this embodiment will be described below.

When both the first measured value and the second measured value are not abnormal values, the control unit 20 obtains a correlation value indicating the correlation between the first measured value and the second measured value, and stores this correlation value in memory. 26. For example, the control unit 20 obtains the correlation value between the first measured value and the second measured value after a predetermined time has passed since the start of lighting and the first measured value and the second measured value are stable. Here, a case where the controller 20 causes the memory 26 to store a correlation value that the second measured value is 20° C. higher than the first measured value will be described.

The operation in which the control unit 20 controls the output of the power conversion unit 10 in a state where both the first measured value and the second measured value are not abnormal values is the same as in the first embodiment, so a description thereof will be omitted. The operation of the control unit 20 when the first measured value or the second measured value is determined to be an abnormal value will be described below.

When the abnormality determination unit 23 determines that the first measured value input to the first input unit 21 is an abnormal value, the estimation unit 27 acquires the second measured value that is not determined to be an abnormal value and the Based on the obtained correlation value, a value obtained by subtracting 20° C. from the second measured value is estimated as the first measured value.

At this time, the output setting unit 24 obtains the first candidate value of the output of the power conversion unit 10 according to the output characteristics shown in FIG. 5A based on the estimated value of the first measurement value estimated by the estimation unit 27. . Based on the second measured value input to the second input unit 22, the output setting unit 24 obtains the second candidate output value of the power conversion unit 10 according to the output characteristics shown in FIG. 5B. Then, the output setting unit 24 compares the magnitudes of the first candidate value and the second candidate value, and sets the smaller one of the first candidate value and the second candidate value as the set value of the output of the power conversion unit 10 . Then, the output control unit 25 controls the on-duty of the switching element included in the power conversion unit 10 so that the output of the power conversion unit 10 matches the set value set by the output setting unit 24 .

Note that when the abnormality determination unit 23 determines that the second measured value input to the second input unit 22 is an abnormal value, the estimation unit 27 stores the first measured value that is not determined to be an abnormal value, the memory 26 A second measurement value is estimated based on the correlation value obtained from . Since the process of estimating the second measured value is the same as the process of estimating the first measured value, the description thereof will be omitted.

Thus, when the abnormality determination unit 23 determines that one of the first measured value and the second measured value is an abnormal value, the estimation unit 27 determines the other of the first measured value and the second measured value, the memory 26 estimating one of the first measurement and the second measurement based on the correlation value obtained from . Then, the output setting unit 24 determines the output of the power conversion unit 10 based on the estimated value of one of the first measured value and the second measured value and the other of the first measured value and the second measured value. Get the setting value. Then, the output control unit 25 controls the on-duty of the switching element included in the power conversion unit 10 so that the output of the power conversion unit 10 matches the setting value set by the output setting unit 24 .

Note that the control unit 20 statistically processes the difference between the first measured value and the second measured value (for example, the average value, the median value, the maximum value, the minimum value, etc. of the difference in a certain period), the first measurement A ratio of the value and the second measured value may be stored in the memory 26 as a correlation value.

Further, it is assumed that the correlation between the first measured value, which is the temperature of lighting device 1 , and the second measured value, which is the temperature of light source 110 , also varies depending on the input/output values of lighting device 1 . Here, the input/output values of the lighting device 1 are the values of the input and output of the lighting device 1, such as current, voltage, and power. Therefore, the control unit 20 obtains a correlation value indicating the correlation between the first measured value and the second measured value using one or more of the current, voltage, and power of the input and output of the lighting device 1 as parameters, This correlation value may be stored in memory 26 . As a result, the estimating section 27 can cancel the variation of the correlation value due to the input/output value of the lighting device 1 and more accurately measure the value determined to be an abnormal value.

(Embodiment 4)
A lighting device 1 according to Embodiment 4 will be described with reference to FIG.

The lighting device 1 of this embodiment differs from that of the third embodiment in that a communication unit 60 is further provided. In the following, configurations similar to those of the third embodiment are denoted by common reference numerals, and descriptions thereof are omitted as appropriate. The configuration (including modifications) described in the fourth embodiment can be applied in appropriate combination with the configurations (including modifications) described in the first to third embodiments.

The communication unit 60 communicates with another lighting device 1</b>A having the same specifications as the lighting device 1 . The lighting device 1 of this embodiment is used to light a light source unit 100 used as a headlight of a vehicle such as an automobile. 2. Description of the Related Art In a vehicle such as an automobile, one headlight is attached to each of the left and right sides of the front part of the vehicle body, and a lighting device 1 and another lighting device 1A having the same specifications as the lighting device 1 are installed in front of the vehicle body. installed on the left and right sides of the The communication unit 60 communicates with another lighting device 1A having the same configuration provided in the same vehicle, using a communication network provided in the vehicle. In addition, the communication part 60 should just be a communication module based on communication protocols, such as LIN (Local Interconnect Network) and CAN (Controller Area Network) used by an in-vehicle network.

That is, the lighting device 1 of the present embodiment and another lighting device 1A have a common configuration, and the lighting device 1 and the lighting device 1A constitute a lighting system. In other words, the lighting system is composed of two lighting devices 1 and 1A having a common configuration, and each of the two lighting devices constituting the lighting system is composed of the lighting device 1 of the present embodiment. there is Although the lighting system is configured with two lighting devices in the present embodiment, the lighting system may be configured with three or more lighting devices having a common configuration.

Here, the fact that the lighting device 1 and another lighting device 1A have the same specifications means that they have a common configuration related to heat generation and heat dissipation. It means having. The light source 110 that is lit by the lighting device 1 and the light source 110A that is lit by the other lighting device 1A have the same specifications. The input voltage, etc. are the same. Since the lighting device 1 and another lighting device 1A have the same specifications, the temperature inside the lighting device main body 70 and the temperature of the light source in the lighting devices 1 and 1A will be approximately the same if there is no influence of the installation environment. It is assumed that

Since the operation of the control unit 20 when the abnormality determination unit 23 determines that both the first measured value and the second measured value are not abnormal values is the same as in the first embodiment, the description thereof will be omitted.

When the abnormality determination unit 23 determines that one of the first measured value and the second measured value is an abnormal value, the control unit 20 transmits the measured value of the temperature of the lighting device 1A from the communication unit 60 to the other lighting device 1A. , the lighting device 1A transmits a request signal requesting transmission of the measured value of the temperature of the light source 100A to be lit. Here, the temperature measurement value of another lighting device 1A is called a third measurement value, and the temperature of the light source of the light source unit 100A that is lit by the other lighting device 1A is called a fourth measurement value. Note that the control unit 20 may transmit an abnormality notification signal for notifying the occurrence of measurement abnormality from the communication unit 60 to another lighting device 1A.

When the communication unit 60 receives the third measured value and the fourth measured value from the other lighting device 1A after transmitting the request signal, the output setting unit 24 of the control unit 20 sets the third measured value received from the other lighting device 1A. An output setpoint is determined using the measured value and the fourth measured value. That is, the output setting unit 24 obtains the output setting value based on the measured value judged to be normal among the first measured value and the second measured value and the measured value of the other lighting device 1A. Note that the memory 26 of the control unit 20 stores output characteristics as shown in FIGS. 5A and 5B, as in the third embodiment.

For example, when the first measured value of the temperature of the lighting device 1 is determined to be an abnormal value, the output setting unit 24 of the control unit 20 receives the third measured value of the temperature of the lighting device 1A from another lighting device 1A. and the second measured value, the set value of the output of the power conversion unit 10 is obtained. Specifically, the output setting unit 24 sets the first candidate value for the output of the power conversion unit 10 according to the output characteristics of FIG. Ask for Further, the output setting unit 24 obtains the second candidate value of the output of the power conversion unit 10 according to the output characteristics of FIG. . The output setting unit 24 compares the magnitudes of the first candidate value and the second candidate value, and sets the smaller one of the first candidate value and the second candidate value as the output set value.

Further, when the second measured value, which is the temperature of light source 110, is determined to be an abnormal value, output setting unit 24 of control unit 20 sets the first measured value and the temperature of the light source received from another lighting device 1A. 4, the set value of the output of the power conversion unit 10 is obtained based on the measured values. Specifically, the output setting unit 24 selects the first candidate for the output of the power conversion unit 10 according to the output characteristics of FIG. find the value. Further, the output setting unit 24 obtains a second candidate value for the output of the power conversion unit 10 according to the output characteristics of FIG. The output setting unit 24 compares the magnitudes of the first candidate value and the second candidate value, and sets the smaller one of the first candidate value and the second candidate value as the output set value.

When the output setting unit 24 sets the output of the power conversion unit 10 as described above, the output control unit 25 sets the output of the power conversion unit 10 so that it matches the set value set by the output setting unit 24. It controls the on-duty of the switching element included in the power conversion unit 10 .

Here, in the lighting device 1 of the present embodiment, when the communication section 60 receives a request signal from another lighting device 1A, the control section 20 of the lighting device 1 communicates the first measured value and the second measured value. It is transmitted from the unit 60 to another lighting device 1A (external device). As a result, even if another lighting device 1A determines that the third measured value or the fourth measured value is an abnormal value, the other lighting device 1A can detect the first measured value and the second measured value measured by the lighting device 1. A set value for the output of the power conversion unit 10 can be obtained using the value.

The timing at which the lighting devices 1 and 1A transmit the temperature measurement values of the lighting devices 1 and 1A and the light source temperature measurement values is not limited to when the lighting devices 1 and 1A receive the request signal.

The lighting device 1 and another lighting device 1A exchange the temperatures of the lighting devices 1 and 1A (first measured value, third measured value) and the temperature of the light source (second measured value, fourth measured value). You can send and receive.

Further, when at least one of the temperature measurement value of the lighting device and the temperature measurement value of the light source reaches or exceeds a predetermined high temperature side threshold value, the lighting device 1 or 1A transmits the temperature measurement value of the lighting device to the other lighting device. and a measurement of the temperature of the light source. Further, when at least one of the temperature measurement value of the lighting device and the temperature measurement value of the light source is equal to or lower than a predetermined low temperature side threshold value, the lighting device 1 or 1A transmits the temperature measurement value of the lighting device to the other lighting device. and a measurement of the temperature of the light source.

Further, in the lighting device 1 of the present embodiment, when either the first measured value or the second measured value becomes an abnormal value, the estimating unit 27 determines the third measured value or the third measured value of another lighting device 1A. The four measurements may be used to extrapolate measurements that are determined to be outliers.

In this case, the lighting device 1 and another lighting device 1A have the temperature of the lighting devices 1 and 1A (first measured value, third measured value) and the temperature of the light source (second measured value, fourth measured value). are sent and received to each other.

Then, in a state where neither the first measured value nor the second measured value is an abnormal value, the control unit 20 sets the first correlation value indicating the correlation between the first measured value and the third measured value A second correlation value indicating the correlation between the measured value and the fourth measured value is obtained. The controller 20 stores the first correlation value and the second correlation value in the memory 26 . The control unit 20 stores, for example, the difference between the first measured value and the third measured value as the first correlation value in the memory 26, and the difference between the second measured value and the fourth measured value as the second correlation value in the memory 26. memorize to

When the abnormality determination unit 23 determines that one of the first measured value and the second measured value is an abnormal value, the estimation unit 27 determines the third or fourth measured value of the other lighting device 1A and the One of the first measurement value and the second measurement value is estimated based on the acquired first correlation value or second correlation value.

The operation of the characteristic portion of the lighting device 1 of this embodiment will be described below.

In a state where both the first measured value and the second measured value are not abnormal values, the control unit 20 controls the first correlation value indicating the correlation between the first measured value and the third measured value and the second measured value and a second correlation value indicating the correlation with the fourth measured value, and the first correlation value and the second correlation value are stored in the memory 26 . For example, after a predetermined time has passed since the start of lighting, the control unit 20 controls the first correlation value between the first measurement value and the third measurement value and the second correlation value in a state where the first measurement value and the second measurement value are stable. A second correlation value is determined between the measured value and the fourth measured value. Here, the control unit 20 sets the first correlation value that the third measured value is 7° C. higher than the first measured value, and the second correlation value that the fourth measured value is 10° C. higher than the second measured value. A case where the correlation values are stored in the memory 26 will be described. Note that the values of the first correlation value and the second correlation value are examples, and may be appropriately changed according to the usage environment and the like.

The operation in which the control unit 20 controls the output of the power conversion unit 10 in a state where both the first measured value and the second measured value are not abnormal values is the same as in the first embodiment, so a description thereof will be omitted. The operation of the control unit 20 when the first measured value or the second measured value is determined to be an abnormal value will be described below.

When the abnormality determining unit 23 determines that the first measured value input to the first input unit 21 is an abnormal value, the estimating unit 27 uses the third measured value of another lighting device 1A to determine the abnormal value. Estimate the measured value.

For example, when the abnormality determination unit 23 determines that the first measured value of the temperature of the lighting device 1 is an abnormal value, the estimation unit 27 determines the third measured value of the temperature of the lighting device received from another lighting device 1A. and the first correlation value obtained from the memory 26, the first measurement value is estimated. Here, the estimation unit 27 estimates a value obtained by subtracting 7° C. from the third measured value as the first measured value. Then, the output setting unit 24 obtains the set value of the output of the power conversion unit 10 based on the estimation result of the first measured value and the second measured value that is not determined to be an abnormal value. Note that the operation of the output setting unit 24 to obtain the set value of the output of the power conversion unit 10 is the same as that of the third embodiment, so the description thereof will be omitted.

Further, when the abnormality determining unit 23 determines that the second measured value of the temperature of the light source 110 is an abnormal value, the estimating unit 27 determines the fourth measured value of the temperature of the light source 110 received from another lighting device 1A. , and the second correlation value obtained from the memory 26, the second measurement value is estimated. Here, the estimation unit 27 estimates a value obtained by subtracting 10° C. from the fourth measured value as the second measured value. Then, the output setting unit 24 obtains the set value of the output of the power conversion unit 10 based on the first measured value that is not determined to be an abnormal value and the estimation result of the second measured value.

Note that when the abnormality determining unit 23 determines that both the first measured value and the second measured value are abnormal values, the estimating unit 27 obtains the third measured value and the first correlation value of another lighting device 1A. Then, the first measured value is estimated, and the second measured value is estimated based on the fourth measured value and the second correlation value of another lighting device 1A.

By the way, even if the lighting devices 1 and 1A have the same configuration, the lighting device 1 and another lighting device 1A may be lit due to differences in distance from other heat sources and differences in heat radiation characteristics of the lighting device and the light source. The temperature of the device may be different, or the temperature of the light source may be different.

Even in that case, the estimating unit 27 calculates the abnormal value Since the measured value determined to be an abnormal value is estimated, the measured value determined to be an abnormal value can be estimated more accurately.

Further, in the lighting device 1 of the present embodiment, when the abnormality determination unit 23 determines that the first measured value or the second measured value is an abnormal value, the control unit 20 transmits the signal from the communication unit 60 to an external device such as an ECU of the vehicle. You may transmit the notification signal which notifies abnormalities to. When the ECU of the vehicle receives the notification signal from the lighting device 1, for example, it displays on the meter panel of the driver's seat to notify the abnormality of the temperature detection function, and prompts the vehicle user to take measures such as inspection and repair. can.

When the abnormality determination unit 23 determines that the first measured value or the second measured value is an abnormal value, the control unit 20 does not immediately turn on the light source unit 100 even if there is a lighting instruction from an external device. By performing control to delay the start, it may be notified to the outside that the first measured value or the second measured value is determined to be an abnormal value. In this case, in order to notify the outside that the first measured value or the second measured value is determined to be an abnormal value, the controller 20 that changes the output of the power conversion unit 10 constitutes the notification unit.

Further, when the lighting device 1 lights the light source unit 100, which is a vehicle light source, the control section 20 may notify the outside of the occurrence of the measurement abnormality by performing the following control.

For example, when the vehicle stops (for example, when the parking brake is activated) in a state where the abnormality determination unit 23 has determined that there is a measurement abnormality, the control unit 20 blinks the light source 110 to notify the outside of the occurrence of the measurement abnormality. may

Further, the control unit 20 may notify the outside of the occurrence of the measurement abnormality by changing the output of the power conversion unit 10 depending on whether the vehicle is stopped or running. For example, the control unit 20 sets the output of the power conversion unit 10 to the set value set by the output setting unit 24 while the vehicle is running, and increases the output of the power conversion unit 10 while the vehicle is stopped compared to when the vehicle is running. By doing so, the occurrence of a measurement abnormality may be notified to the outside.

(Embodiment 5)
FIG. 7 is a cross-sectional view of the lighting fixture 200 according to this embodiment.

A lighting fixture 200 according to the present embodiment is, for example, a vehicle headlight device.

The lighting fixture 200 includes a fixture main body 201 that houses the lighting device 1 and the light source unit 100 described in the first embodiment.

The instrument main body 201 is composed of a body 202 and a cover 203 .

The body 202 is made of synthetic resin or metal and is shaped like a box having an opening in the front.

The cover 203 is made of a translucent material such as glass or acrylic resin, and is attached to the opening of the body 202 .

The light source unit 100 includes a substrate 101 on which a light source 110 is mounted. A second temperature sensing portion 120 made of a thermistor is also mounted on the substrate 101 .

The substrate 101 is attached to a heat radiating member 102, and the heat radiating member 102 is fixed to the body 202 via a supporting member 103 such as a screw.

The light source unit 100 also includes a lens 105 that controls light distribution, and the lens 105 is attached to the heat dissipation member 102 via a support member 104 . A reflecting member 106 for reflecting the light emitted from the light source 110 and allowing the reflected light to enter the lens 105 is attached to the heat dissipating member 102 .

The lighting device 1 is also housed in the body 202 . A lighting device main body 70 of the lighting device 1 is arranged below the light source unit 100 inside the body 202 and attached to the body 202 via a support member. The lighting device 1 and the substrate 101 of the light source unit 100 are electrically connected via an electric wire 61 . Further, the lighting device 1 is connected to the DC power source E1 through the electric wire 62. As shown in FIG.

Here, the lighting fixture 200 is not limited to the one including the lighting device 1 and the light source unit 100 described in Embodiment 1, and the lighting device 1 and the light source unit described in Embodiments 1 to 4 (including modifications). 100.

Since the lighting fixture 200 of the present embodiment includes the lighting device 1 described in Embodiments 1 to 4, even if an abnormality occurs in the temperature detection function, the lighting device 1 is unlikely to be abnormally controlled. A device 200 can be provided.

Note that the lighting fixture 200 is not limited to a vehicle headlight device, and may be lighting fixtures such as facility lighting and downlights used in facilities such as residences, commercial facilities, and office buildings.

(Embodiment 6)
FIG. 8 shows a perspective view of a vehicle 300 according to this embodiment.

Vehicle 300 is, for example, a sedan-type ordinary passenger car.

The lighting fixtures 200 described in the fifth embodiment are arranged on the left and right sides of the front portion of the vehicle body 301 of the vehicle 300 . Since the lighting fixture 200 includes the lighting device 1 described in Embodiments 1 to 4, the vehicle 300 including the lighting device 1 in which abnormal control is unlikely to be performed even when an abnormality occurs in the temperature detection function. can provide

(summary)
As described above, the lighting device 1 of the first aspect includes the power converter 10 that converts input power and outputs the converted power to the light source 110 and the controller 20 that controls the output of the power converter 10 . The control section 20 has a first input section 21 and a second input section 22 . A first measurement value is input to the first input unit 21 from the first temperature sensing unit 30 that measures the internal temperature of the lighting device main body 70 housing at least the power conversion unit 10 and the control unit 20 . A second measurement value is input to the second input unit 22 from the second temperature sensing unit 120 that measures the temperature of the light source 110 . When the control unit 20 determines that both the first measured value and the second measured value are not abnormal values, if one of the first measured value and the second measured value exceeds a predetermined threshold value, the Control is performed to suppress the output value of the power converter. When determining that at least one of the first measured value and the second measured value is an abnormal value, the control unit 20 adjusts the output value of the power conversion unit 10 based on the first measured value and the second measured value. control to an output value different from the output value determined by

According to the lighting device 1 of the first aspect, when at least one of the first measured value and the second measured value is an abnormal value, the control unit 20 sets the output value of the power conversion unit 10 to the first measured value. The output value is controlled to be different from the output value determined based on the second measurement value. Therefore, the output value of the power conversion unit 10 is not controlled to the output value determined based on the first measured value and the second measured value determined to be abnormal, and the temperature detection function is abnormal. Abnormal control becomes difficult to be performed even when it occurs.

In the lighting device 1 of the second aspect, in the first aspect, when the control unit 20 determines that at least one of the first measured value and the second measured value is an abnormal value, the power conversion unit 10 The output may be controlled to a constant value.

According to the lighting device 1 of the second aspect, when an abnormality occurs in the temperature detection function, the control unit 20 controls the output of the power conversion unit 10 to a constant value regardless of the temperature. Abnormal control is less likely to be performed even if an abnormality occurs in

In the lighting device 1 of the third aspect, in the second aspect, the constant value is preferably smaller than the output value when both the first measured value and the second measured value are not abnormal values.

According to the lighting device 1 of the third aspect, when an abnormality occurs in the temperature detection function, the output of the power conversion unit 10 is reduced.

In the lighting device 1 of the fourth aspect, in the first aspect, when the controller 20 determines that one of the first measured value and the second measured value is an abnormal value, the internal temperature of the lighting device main body 70 and the light source An estimate of the temperature corresponding to one of the first and second measurements of the temperature of 110 may be determined. Based on the other measured value of the first measured value and the second measured value, the control unit 20 obtains an estimated temperature value corresponding to one of the first measured value and the second measured value. Control unit 20 controls power conversion unit 10 based on the estimated temperature value corresponding to one of the first measurement value and the second measurement value and the other measurement value of the first measurement value and the second measurement value. may control the output value of

According to the lighting device 1 of the fourth aspect, when one of the first measured value and the second measured value is determined to be an abnormal value, the controller 20 determines whether one of the first measured value and the second measured value and the other measured value of the first measured value and the second measured value, the output value of the power converter 10 is controlled. Therefore, even if an abnormality occurs in the temperature detection function, abnormal control is less likely to be performed.

The lighting device 1 of the fifth aspect may further include a memory 26 in the fourth aspect. The memory 26 stores a correlation value indicating the correlation between the first measured value and the second measured value obtained when neither the first measured value nor the second measured value is an abnormal value. When the control unit 20 determines that one of the first measured value and the second measured value is an abnormal value, the control unit 20 determines whether the internal temperature of the lighting device main body 70 or the temperature of the light source 110 is the first measured value or the second measured value. An estimate of the temperature corresponding to one of the values may be determined. Based on the other measured value of the first measured value and the second measured value and the correlation value acquired from the memory, the control unit 20 determines the first temperature between the internal temperature of the lighting device main body 70 and the temperature of the light source 110 . An estimated temperature value corresponding to one of the measured value and the second measured value may be obtained.

According to the lighting device 1 of the fifth aspect, the controller 20 estimates the measured value judged to be abnormal among the first measured value and the second measured value based on the correlation value. Values and determined measurements can be estimated more accurately. Therefore, even if an abnormality occurs in the temperature detection function, abnormal control is less likely to be performed.

The lighting device 1 of the sixth aspect may further include a communication section 60 in the first aspect. A third measurement value obtained by measuring the internal temperature of the lighting device main body 70 included in the lighting device 1A and the temperature of the light source that is lit by the lighting device 1A are measured from the lighting device 1A to the communication unit 60. Fourth measurements are input, respectively. When the control unit 20 determines that one of the first measurement value and the second measurement value is an abnormal value, the first measurement value and the fourth measurement value among the third measurement value and the fourth measurement value input to the communication unit 60 The output value of power conversion section 10 may be controlled based on the measured value corresponding to one of the second measured values and the other of the first measured value and the second measured value.

According to the lighting device 1 of the sixth aspect, when one of the first measured value and the second measured value is determined to be an abnormal value, the controller 20 controls the other of the first measured value and the second measured value. Then, the output value of the power conversion unit 10 is controlled based on the measured value input to the communication unit 60 from another lighting device 1A. Therefore, even if an abnormality occurs in the temperature detection function, the output value of the power conversion unit 10 is not controlled based on the measured value determined to be an abnormal value, and abnormal control is less likely to be performed.

The lighting device 1 of the seventh aspect may further include the communication section 60 and the memory 26 in the first aspect. A third measurement value obtained by measuring the internal temperature of the lighting device main body 70 included in the lighting device 1A and the temperature of the light source that is lit by the lighting device 1A are measured from the lighting device 1A to the communication unit 60. Fourth measurements are input, respectively. The memory 26 stores a correlation value (first correlation value) that indicates the correlation between the first measured value and the third measured value obtained when the first measured value is not an abnormal value. When the control unit 20 determines that the first measured value is an abnormal value, the third measured value input to the communication unit 60 and the correlation between the first measured value and the third measured value acquired from the memory. The measured value of the internal temperature of the lighting device main body 70 may be obtained using the correlation value shown. The control unit 20 may control the output value of the power conversion unit 10 based on the measured value of the internal temperature of the lighting device main body 70 and the second measured value.

According to the lighting device 1 of the seventh aspect, even when the first measured value is determined to be an abnormal value, the control unit 20 uses the third measured value and the correlation value of another lighting device 1A to obtain the first measured value. Measured values can be estimated. Therefore, by controlling the output of the power conversion unit 10 based on the estimation result of the first measurement value and the second measurement value, the control unit 20 can control the output of the power conversion unit 10 even when an abnormality occurs in the temperature detection function. is less likely to occur.

The lighting device 1 of the eighth aspect may further include the communication section 60 and the memory 26 in the first or seventh aspect. A third measurement value obtained by measuring the internal temperature of the lighting device main body 70 included in the lighting device 1A and the temperature of the light source that is lit by the lighting device 1A are measured from the lighting device 1A to the communication unit 60. Fourth measurements are input, respectively. The memory 26 stores a correlation value (second correlation value) that indicates the correlation between the second measurement value obtained when the second measurement value is not an abnormal value and the fourth measurement value. When the control unit 20 determines that the second measurement value is an abnormal value, the fourth measurement value input to the communication unit 60 and the correlation between the second measurement value and the fourth measurement value acquired from the memory. An estimated value of the temperature of the light source 110 may be obtained using the correlation value shown. Control unit 30 may control the output value of power conversion unit 10 based on the estimated value of the temperature of light source 110 and the first measured value.

According to the lighting device 1 of the eighth aspect, even when the second measured value is determined to be an abnormal value, the control unit 20 uses the fourth measured value and the correlation value of another lighting device 1A to obtain the second measured value. Measured values can be estimated. Therefore, by controlling the output of the power conversion unit 10 based on the first measured value and the estimation result of the second measured value, the control unit 20 can detect an abnormal temperature even when an abnormality occurs in the temperature detection function. control becomes difficult.

The lighting device 1 of the ninth aspect, in the first aspect, may further include a communication unit 60 that outputs the first measured value and the second measured value to an external device (for example, another lighting device 1A). .

According to the lighting device 1 of the ninth aspect, the external device can use the first measured value and the second measured value output by the lighting device 1 . Also, if the external device is another lighting device 1A, the other lighting device 1A may perform processing such as estimation of the measured value using the first measured value and the second measured value output by the lighting device 1. can be done.

In any one of the first to ninth aspects of the lighting device 1 of the tenth aspect, the controller 20 determines that either the first measured value or the second measured value is outside the predetermined temperature range. You may judge that it is an abnormal value.

According to the lighting device 1 of the tenth aspect, when the first measured value or the second measured value becomes an abnormal value outside the predetermined temperature range, the controller 20 controls the first measured value or the second measured value. 2 measurements can be determined to be outliers.

In the lighting device 1 of the eleventh aspect, in any one of the first to tenth aspects, the controller 20 determines that the temperature difference between the first measured value and the second measured value is equal to or greater than a predetermined criterion. , the first measured value or the second measured value may be determined to be an abnormal value.

According to the lighting device 1 of the eleventh aspect, when an abnormality occurs such that the temperature difference between the first measured value and the second measured value becomes equal to or greater than the predetermined criterion, the controller 20 controls the temperature difference between the first measured value and the second measured value can be determined to be an abnormal value.

In the lighting device 1 of the twelfth aspect, in any one of the first to eleventh aspects, when the controller 20 determines that at least one of the first measured value and the second measured value is an abnormal value, It may further include a notification unit that notifies the outside that the first measured value or the second measured value is determined to be an abnormal value.

According to the lighting device 1 of the twelfth aspect, the notifying section notifies the outside that the first measured value or the second measured value is determined to be an abnormal value, thereby prompting the user to take some action against the occurrence of the measurement abnormality. be able to.

A lighting fixture 200 of one aspect includes the lighting device 1 of any one of the first to twelfth aspects, and a fixture body 201 that holds the lighting device 1 .

As a result, it is possible to provide the lighting fixture 200 including the lighting device 1 in which abnormal control is unlikely to be performed even when an abnormality occurs in the temperature detection function.

A vehicle 300 of one aspect includes a lighting device 200 of one aspect and a vehicle body 301 to which the lighting device 200 is attached.

Accordingly, it is possible to provide the vehicle 300 including the lighting device 1 that is less likely to perform abnormal control even when an abnormality occurs in the temperature detection function.

Reference Signs List 1, 1A lighting device 10 power conversion unit 20 control unit (notification unit)
21 first input unit 22 second input unit 23 abnormality determination unit 24 output setting unit 25 output control unit 26 memory 27 estimation unit 30 first temperature sensing unit 60 communication unit (notification unit)
70 lighting device main body 100, 100A light source unit 110 light source 120 second temperature sensing part 200 lighting fixture 201 fixture main body 300 vehicle 301 vehicle body

Claims (10)

a power conversion unit that converts input power and outputs it to a light source;
A control unit that controls the output of the power conversion unit,
The control unit includes a first input unit that receives a first measured value from a first temperature sensing unit that measures an internal temperature of a lighting device main body that houses at least the power conversion unit and the control unit; A second input unit into which a second measured value is input from a second temperature sensing unit that measures
When the control unit determines that both the first measured value and the second measured value are not abnormal values, one of the first measured value and the second measured value exceeds a predetermined threshold and control to suppress the output value of the power conversion unit,
When the controller determines that at least one of the first measured value and the second measured value is an abnormal value, the control unit changes the output value of the power conversion unit to the temperature of the main body of the lighting device and the temperature of the light source. controlling to an output value different from the output value determined based on the first measured value and the second measured value, regardless of the temperature;
The control unit determines that the first measured value or the second measured value is an abnormal value when the temperature difference between the first measured value and the second measured value is equal to or greater than a predetermined criterion.
lighting device. The first measured value being an abnormal value means that the first measured value becomes an abnormal value due to a failure or disconnection occurring in the first temperature sensing part or the first input part,
The second measured value being an abnormal value means that the second measured value becomes an abnormal value due to a failure or disconnection occurring in the second temperature sensing part or the second input part.
The lighting device according to claim 1. When the control unit determines that at least one of the first measured value and the second measured value is an abnormal value, the control unit controls the output of the power conversion unit to a constant value.
The lighting device according to claim 1 or 2. The constant value is smaller than the output value when both the first measured value and the second measured value are not abnormal values.
The lighting device according to claim 3. a power conversion unit that converts input power and outputs it to a light source;
A control unit that controls the output of the power conversion unit,
The control unit includes a first input unit that receives a first measured value from a first temperature sensing unit that measures an internal temperature of a lighting device main body that houses at least the power conversion unit and the control unit; A second input unit into which a second measured value is input from a second temperature sensing unit that measures
When the control unit determines that both the first measured value and the second measured value are not abnormal values, one of the first measured value and the second measured value exceeds a predetermined threshold and control to suppress the output value of the power conversion unit,
When the controller determines that at least one of the first measured value and the second measured value is an abnormal value, the control unit changes the output value of the power conversion unit to the temperature of the main body of the lighting device and the temperature of the light source. controlling to an output value different from the output value determined based on the first measured value and the second measured value, regardless of the temperature;
The control unit determines that the first measured value or the second measured value is an abnormal value when the temperature difference between the first measured value and the second measured value is equal to or greater than a predetermined criterion,
When determining that at least one of the first measured value and the second measured value is an abnormal value, the control unit controls the output of the power conversion unit to a constant value,
The constant value is smaller than the output value when both the first measured value and the second measured value are not abnormal values.
lighting device. Further comprising a communication unit that outputs the first measured value and the second measured value to an external device,
The lighting device according to claim 1 or 2. The control unit determines that if either the first measured value or the second measured value is equal to or lower than a lower limit value of a predetermined temperature range or equal to or higher than an upper limit value of the temperature range, it is an abnormal value. to decide,
The lighting device according to any one of claims 1 to 6. When the control unit determines that at least one of the first measured value and the second measured value is an abnormal value, externally informs that the first measured value or the second measured value is determined to be an abnormal value. further comprising a notification unit,
The lighting device according to any one of claims 1 to 7. A lighting device comprising the lighting device according to any one of claims 1 to 8 and a fixture body holding the lighting device,
lighting equipment. A lighting fixture according to claim 9 and a vehicle body to which the lighting fixture is attached,
vehicle.

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