JP5404380B2 - Power supply unit, light source unit, illumination device, and display device - Google Patents

Description

  The present invention relates to a light source unit and a power supply unit that supplies power to the light source unit.

In a lighting fixture or display device having a light source such as an LED, the light source circuit part (light source unit) including the light source is made independent from the lighting circuit part (power supply unit) that supplies power to the light source unit, thereby replacing the light source. Can do.
For example, the power supply unit controls the power supplied to the light source unit by adjusting the voltage applied to the light source unit so that the current flowing through the light source unit becomes constant.

JP 2007-234415 A

If the type of the light source unit is different, such as the main wavelength, correlated color temperature, luminous efficiency, and number of light sources used as the light source, the electrical characteristics such as the voltage to be applied to the light source unit and the current to be passed through the light source unit are different. Even if the light source units are the same type, the light source units may have different electrical characteristics if the electrical characteristics of the light sources vary.
When the type and electrical characteristics of the light source unit are different, it is necessary to change set values set in the power supply unit such as a target value of the current flowing through the light source unit.
The present invention has been made to solve the above-described problems, for example, and always supplies appropriate power to the light source unit even when the light source units of different types and electrical characteristics are connected to the power source unit. For the purpose.

  A power supply unit according to the present invention includes a lighting connection unit that connects a light source unit, and a type acquisition unit that acquires type information representing the type of the light source unit from the light source unit connected to the lighting connection unit via the lighting connection unit. A power setting unit that sets power to be supplied to the light source unit based on the type information acquired by the type acquisition unit, and a power source that generates power to be supplied to the light source unit according to the power set by the power setting unit And a circuit.

  According to the power supply unit of the present invention, it is possible to always supply appropriate power to the light source unit even when light source units of different types and electrical characteristics are connected.

FIG. 3 is a partially broken perspective view illustrating an example of the structure of the lighting fixture 800 in the first embodiment. FIG. 2 is an overall configuration diagram illustrating an example of a configuration of a lighting fixture 800 according to Embodiment 1. FIG. 3 is an electric circuit diagram illustrating an example of a circuit configuration of the lighting fixture 800 according to Embodiment 1. FIG. 6 is a block configuration diagram illustrating a part of the configuration of a lighting fixture 800 according to Embodiment 2. FIG. 9 is a block configuration diagram showing a part of the configuration of a lighting fixture 800 in Embodiment 3. FIG. 10 is a block configuration diagram illustrating another example of a configuration of a lighting fixture 800 according to Embodiment 3. FIG. 6 is an electric circuit diagram illustrating an example of a circuit configuration of a lighting fixture 800 according to Embodiment 4. FIG. 6 is an electric circuit diagram illustrating an example of a circuit configuration of a lighting fixture 800 according to Embodiment 5. FIG. 18 is an electric circuit diagram illustrating an example of a circuit configuration of a lighting fixture 800 according to Embodiment 6. FIG. 18 is an electric circuit diagram illustrating an example of a circuit configuration of a lighting fixture 800 according to Embodiment 7. FIG. 20 is an overall perspective view illustrating an appearance of a display device 801 according to Embodiment 8. FIG. 20 is an exploded perspective view illustrating an internal structure of a display device 801 according to Embodiment 8.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.

FIG. 1 is a partially broken perspective view showing an example of the structure of a lighting fixture 800 in this embodiment.
The lighting fixture 800 (lighting device) includes a case 810, a power supply unit 100, a light source unit 200 (light source module), and the like.
The case 810 is, for example, a cylindrical housing and incorporates the power supply unit 100 and the like.
The power supply unit 100 receives power from an AC power source such as a commercial power source or a DC power source such as a battery, and generates power to be supplied to the light source unit 200.
The light source unit 200 (LED light source unit) includes a light source 221 such as an LED. The light source 221 is lit by the power supplied from the power supply unit 100.
The power supply unit 100 (LED lighting unit part) has a connection part 110 (lighting connection part). The light source unit 200 has a connection part 210 (light source connection part). The two connecting portions 110 and 210 physically and electrically connect the power supply unit 100 and the light source unit 200 by engaging with each other.

  The light source unit 200 includes a plurality of types having different brightness and correlated color temperature. The light source unit 200 is separable and detachable. The lighting fixture 800 can easily change the brightness and the correlated color temperature by replacing the light source unit 200 with another type. In addition, for example, when a newly developed LED with good luminous efficiency is used, the newly developed LED is replaced with a light source unit 200 that uses the light source 221, so that the lighting device 800 has the same brightness and consumes less power. be able to.

FIG. 2 is an overall configuration diagram showing an example of the configuration of the lighting fixture 800 in this embodiment.
The power supply unit 100 includes a power supply circuit 130, a type determination unit 150, and a lighting control unit 160.
The light source unit 200 includes a light source circuit 220 and a type information output unit 250 (identification circuit).

The power supply circuit 130 generates power to be supplied to the light source circuit 220. The power supply circuit 130 includes, for example, a DC power supply and a DC / DC conversion circuit (DC-DC converter), and supplies the DC voltage generated by the DC power supply to the light source circuit 220 when the DC / DC conversion circuit steps up or down the DC voltage. Generate power.
The electric power generated by the power supply circuit 130 is supplied to the light source circuit 220 through the connection units 110 and 210. The light source circuit 220 is a circuit that applies power supplied from the power supply circuit 130 via the connection units 110 and 210 to the light source 221.
The type information output unit 250 holds information indicating the type (performance) of the light source unit 200 (hereinafter referred to as “type information”). The type of the light source unit 200 includes electrical characteristics such as a standard input voltage and a standard input current of the light source unit 200, for example. The type information (performance information) held by the type information output unit 250 is provided to the type determination unit 150 via the connection units 210 and 110. The type determination unit 150 (type acquisition unit, identification unit) acquires the type information provided via the connection units 210 and 110.

  The lighting control unit 160 controls the power supply circuit 130 based on the type information acquired by the type determining unit 150. For example, the lighting control unit 160 obtains power to be supplied to the light source circuit 220 from the type of the light source unit 200 represented by the type information, controls the power supply circuit 130, and supplies the obtained power to the light source circuit 220. To. Alternatively, the lighting control unit 160 obtains the value of the input voltage when the light source circuit 220 is normally lit from the type of the light source unit 200 indicated by the type information, and the input voltage of the light source circuit 220 deviates from the normal range. In this case, the supply of power from the power supply circuit 130 to the light source circuit 220 is stopped.

As described above, the light source unit 200 includes a plurality of types having different brightness and correlated color temperature. This is realized, for example, by changing the type and number of the light sources 221. Therefore, the electrical characteristics such as the power to be supplied to the light source circuit 220 and the normal range of the input voltage of the light source circuit 220 differ depending on the type of the light source unit 200.
The power supply unit 100 acquires the type information held by the light source unit 200, and supplies the light source unit 200 with power suitable for the currently connected light source unit 200 based on the acquired type information.

  FIG. 3 is an electric circuit diagram showing an example of a circuit configuration of the lighting fixture 800 in this embodiment.

  Connection unit 110 and connection unit 210 each have three terminals. The terminals of the connection part 110 and the terminals of the connection part 210 correspond one-to-one, and the corresponding terminals are connected to each other to form three connection points a, b, and c. The connection part 110 and the connection part 210 are an insertion blade, a connector, a harness, etc., for example. Among the terminals of the connecting portion 110, a terminal forming the connection point a is called a lighting side terminal a, a terminal forming the connection point b is called a lighting side terminal b, and a terminal forming the connection point c is called a lighting side terminal c. Of the terminals on the connection part 210 side, the terminal forming the connection point a is the light source side terminal a, the terminal forming the connection point b is the light source side terminal b, and the terminal forming the connection point c is the light source side terminal c. Call.

In the light source unit 200, the light source circuit 220 is, for example, a circuit in which a plurality of light sources 221 are electrically connected in series. The light source circuit 220 is electrically connected between the light source side terminal a and the light source side terminal c.
The type information output unit 250 (identification circuit) has a resistor R52, for example. The resistor R52 (type information circuit) is electrically connected between the light source side terminal a and the light source side terminal c. The resistance value of the resistor R52 varies depending on the type of the light source unit 200. That is, the resistance value of the resistor R52 is type information (performance information).
The resistor R52 may be a fixed resistor whose resistance value is fixed, or may be a semi-fixed resistor or a variable resistor whose resistance value can be varied. When the variation in the electrical characteristics of the light source 221 is large, it is preferable that the resistance value of the resistor R52 be variable. Then, for example, in the manufacturing process of the light source unit 200, after the assembly of the light source unit 200 is completed, the electrical characteristics of the light source circuit 220 are measured, and the resistance value of the resistor R52 is adjusted based on the measured electrical characteristics. Can do.

  In addition to the above-described configuration, the power supply unit 100 includes a feedback generation circuit 140 (current detection unit), a voltage detection circuit 170, and a switch circuit 180.

  The type determination unit 150 includes, for example, a resistor R51. The resistor R51 (voltage dividing resistor) is electrically connected between the lighting-side terminal b and the ground wiring (GND) of the power supply unit 100. As a result, the resistor R52 of the type information output unit 250 and the resistor R51 of the type determination unit 150 are electrically connected in series. When a voltage is applied to the connection point a, a voltage obtained by dividing the voltage by the two resistors R52 and R51 is generated at both ends of the resistor R51. The type determination unit 150 outputs a voltage generated at both ends of the resistor R51 as a signal (LED identification signal) representing the type information acquired from the type information output unit 250. Since the voltage output by the type determination unit 150 varies depending on the resistance value of the resistor R52, the power supply unit 100 handles this voltage as type information.

The power supply circuit 130 (test power generation circuit) has a positive output terminal, a negative output terminal, and a feedback input terminal. The negative output terminal is electrically connected to the ground wiring of the power supply unit 100.
The power supply circuit 130 generates a DC voltage, and outputs the generated voltage as a potential difference between the positive output terminal and the negative output terminal. The power supply circuit 130 inputs a potential difference between the feedback input terminal and the negative output terminal as a feedback voltage. When the input feedback voltage is higher than a predetermined voltage, the power supply circuit 130 decreases the voltage value of the generated DC voltage. Conversely, when the input feedback voltage is lower than the predetermined voltage, the power supply circuit 130 increases the voltage value of the generated DC voltage. As will be described later, the feedback voltage is proportional to the current flowing through the light source circuit 220. When the DC voltage generated by the power supply circuit 130 increases, the current flowing through the light source circuit 220 increases and the feedback voltage increases. Conversely, when the DC voltage generated by the power supply circuit 130 decreases, the current flowing through the light source circuit 220 decreases and the feedback voltage decreases. For this reason, the power supply circuit 130 adjusts the voltage value of the generated DC voltage so that the feedback voltage matches the predetermined voltage.

The feedback generation circuit 140 measures the current flowing through the light source circuit 220 and generates a feedback voltage (feedback voltage) that is fed back to the power supply circuit 130. The feedback generation circuit 140 generates a feedback voltage that is proportional to the measured current. The feedback generation circuit 140 receives a signal representing an instruction from the lighting control unit 160, selects a proportionality constant according to the input signal, and generates a feedback voltage using the selected proportionality constant.
The feedback generation circuit 140 includes, for example, three resistors R41, R42, and R43 (voltage generating resistors) and two switching elements Q46 and Q47 (LED current changeover switches). The switching elements Q46 and Q47 are, for example, field effect transistors (hereinafter referred to as “FETs”). The resistor R42 and the switching element Q46 are electrically connected in series. Similarly, the resistor R43 and the switching element Q47 are electrically connected in series. The resistor R41, the series circuit of the resistor R42 and the switching element Q46, and the series circuit of the resistor R43 and the switching element Q47 are electrically connected in parallel. This parallel circuit is electrically connected between the lighting side terminal c and the negative side output terminal of the power supply circuit 130. Thereby, the parallel circuit and the light source circuit 220 are electrically connected in series. The same current as that flowing through the light source circuit 220 flows through the parallel circuit, and a voltage proportional to the flowing current is generated at both ends of the parallel circuit. The feedback generation circuit 140 outputs a voltage generated at both ends of the parallel circuit as a feedback voltage. That is, the equivalent resistance value of the parallel circuit is a proportional constant.

  The two switching elements Q46 and Q47 are turned on and off in accordance with a signal from the lighting control unit 160, respectively. When both of the switching elements Q46 and Q47 are off, the equivalent resistance value of the parallel circuit is equal to the resistance value of the resistor R41. When the switching element Q46 is on and the switching element Q47 is off, the equivalent resistance value of the parallel circuit is equal to the reciprocal of the sum of the reciprocal of the resistance of the resistor R41 and the reciprocal of the resistance of the resistor R42. When the switching element Q46 is off and the switching element Q47 is on, the equivalent resistance value of the parallel circuit is equal to the reciprocal of the sum of the reciprocal of the resistance value of the resistor R41 and the reciprocal of the resistance value of the resistor R43. When both of the switching elements Q46 and Q47 are on, the equivalent resistance value of the parallel circuit is equal to the reciprocal of the sum of the reciprocal of the resistance of the resistor R41, the reciprocal of the resistance of the resistor R42, and the reciprocal of the resistance of the resistor R43.

  For example, when the resistance value of the resistor R41 is 10Ω, the resistance value of the resistor R42 is 50Ω, and the resistance value of the resistor R43 is 25Ω, the equivalent resistance value of the parallel circuit is obtained by turning on and off the two switching elements Q46 and Q47. One of four values, 10Ω, 8.33Ω, 7.14Ω, and 6.25Ω. When the voltage value of the DC voltage generated by the power supply circuit 130 is adjusted so that the feedback voltage becomes 5 V, for example, the currents flowing through the light source circuit 220 are 500 mA, 600 mA, 700 mA, and 800 mA, respectively.

The voltage detection circuit 170 measures the DC voltage generated by the power supply circuit 130 and generates a detection voltage. The voltage detection circuit 170 generates a detection voltage proportional to the measured DC voltage. The voltage detection circuit 170 receives a signal representing an instruction from the lighting control unit 160, selects a proportional constant according to the input signal, and generates a detection voltage using the selected proportional constant.
The voltage detection circuit 170 has, for example, three resistors R71, R72, R73 and a switching element Q77. The switching element Q77 is, for example, an FET. The resistor R73 and the switching element Q77 are electrically connected in series. The resistor R72 and the series circuit of the resistor R73 and the switching element Q77 are electrically connected in parallel. The parallel circuit (LED light source unit abnormality detection adjusting unit) and the resistor R71 are electrically connected in series. This series circuit is electrically connected between the positive output terminal and the negative output terminal of the power supply circuit 130. As a result, the DC voltage generated by the power supply circuit 130 is divided by the resistor R71 and the parallel circuit including the resistor R72, and the divided voltage is generated at both ends of the parallel circuit including the resistor R72. The voltage detection circuit 170 outputs a voltage generated at both ends of the parallel circuit including the resistor R72 as a detection voltage. That is, the voltage division ratio between the resistor R71 and the parallel circuit including the resistor R72 is a proportionality constant.

Switching element Q77 is turned on / off in accordance with a signal from lighting control unit 160. When the switching element Q77 is off, the equivalent resistance value of the parallel circuit including the resistor R72 is equal to the resistance value of the resistor R72. When switching element Q77 is on, the equivalent resistance value of the parallel circuit including resistor R72 is equal to the inverse of the sum of the inverse of the resistance of resistor R72 and the inverse of the resistance of resistor R73.
For example, when the resistance value of the resistor R71 is 19 kΩ, the resistance value of the resistor R72 is 1 kΩ, and the resistance value of the resistor R73 is 3.8 kΩ, the equivalent resistance value of the parallel circuit including the resistor R72 is turned on / off by switching the switching element Q77. Becomes a value of 1 kΩ or 792 Ω, and the voltage detection circuit 170 generates a voltage that is 1 / 20th and 1 / 25th of the DC voltage generated by the power supply circuit 130 as a detection voltage.

  The switching elements Q46, Q47, and Q77 are not limited to FETs, but may be other electronic switches or mechanical switches such as relays. Switching on / off of the switching elements Q46, Q47, Q77 occurs when the light source unit 200 is replaced and the type of the light source unit 200 changes, so that the switching elements Q46, Q47, Q77 maintain the same state. Low power consumption is desirable, and the response speed may be slow.

The switch circuit 180 supplies the DC voltage generated by the power supply circuit 130 to the light source unit 200 in accordance with a signal representing an instruction from the lighting control unit 160, or stops the supply.
The switch circuit 180 includes, for example, four resistors R81, R82, R84, R85, and two switching elements Q83, Q86. The switching element Q83 is, for example, an NPN bipolar transistor. The switching element Q86 is, for example, a PNP bipolar transistor. One terminal of the resistor R81 is electrically connected to the lighting signal output terminal of the lighting control unit 160. The other terminal of the resistor R81 is electrically connected to the base terminal of the switching element Q83. The resistor R82 is electrically connected between the base terminal and the emitter terminal of the switching element Q83. The emitter terminal of the switching element Q83 is electrically connected to the ground wiring of the power supply unit 100. The resistor R84 is electrically connected between the collector terminal of the switching element Q83 and the base terminal of the switching element Q86. The resistor R85 is electrically connected between the base terminal and the emitter terminal of the switching element Q86. The emitter terminal of the switching element Q86 is electrically connected to the positive output terminal of the power supply circuit 130. The collector terminal of the switching element Q86 is electrically connected to the lighting side terminal a.
A voltage obtained by dividing the voltage of the lighting signal output terminal of the lighting control unit 160 by the resistor R81 and the resistor R82 is applied between the base and emitter of the switching element Q83. If this voltage is higher than a predetermined voltage (for example, 0.7 V), switching element Q83 is turned on and a collector current flows. The collector current of switching element Q83 is limited by resistor R84. A part of the collector current of the switching element Q83 flows through the resistor R85 to generate a voltage at both ends of the resistor R85, and this voltage is applied between the base and emitter of the switching element Q86. If this voltage is higher than a predetermined voltage (for example, 0.7 V), the switching element Q86 is turned on, and the DC voltage generated by the power supply circuit 130 is applied to the light source circuit 220 via the connection point a.
When the voltage of the lighting signal output terminal of the lighting control unit 160 is low and the base-emitter voltage of the switching element Q83 is lower than a predetermined voltage, the switching element Q83 is turned off and no collector current flows. For this reason, the base-emitter voltage of the switching element Q86 also becomes lower than the predetermined voltage, and the switching element Q86 is turned off, so that the DC voltage generated by the power supply circuit 130 is not applied to the light source circuit 220.

The lighting control unit 160 includes, for example, a microcomputer (hereinafter referred to as “microcomputer”).
The microcomputer includes, for example, a processing device (hereinafter referred to as “CPU”), a storage device, an input device, and an output device (not shown).
The CPU processes the data by executing the program and controls the entire microcomputer including the CPU itself.
The storage device stores a program executed by the CPU and data processed by the CPU. Examples of the storage device include a nonvolatile memory (hereinafter referred to as “ROM”) and a volatile memory (hereinafter referred to as “RAM”).
The input device inputs a digital signal or an analog signal from the outside of the microcomputer and converts the data into a format that can be processed by the CPU. The data converted by the input device may be processed directly by the CPU or stored in a RAM or the like. Examples of the input device include an analog-digital converter (hereinafter referred to as “ADC”). The ADC measures the potential of a terminal for inputting an analog signal at a timing instructed by the CPU or at a predetermined cycle, and quantizes the measured potential and converts it into digital data.
The output device converts the data processed by the CPU into a digital signal or an analog signal and outputs it to the outside of the microcomputer. Data to be converted by the output device may be data directly received from the CPU, or data stored in a RAM or the like. Examples of the output device include a digital-to-analog converter (hereinafter referred to as “DAC”). The DAC generates a voltage proportional to a numerical value represented by data to be converted, and outputs the voltage from a terminal that outputs an analog signal.
The functional blocks described below are realized by the CPU executing a program stored in the ROM, processing data, and controlling the entire microcomputer.
Note that the configuration for realizing the functional blocks described below is not limited to a microcomputer, and may be other electronic circuits such as analog circuits, digital circuits, and integrated circuits, or electrical circuits, or electrical such as mechanical configurations. A configuration other than the configuration may be used.

  The lighting control unit 160 includes a characteristic determination unit 161, a power setting unit 162, a threshold switching unit 163, an abnormality determination unit 164, and a lighting determination unit 165.

  The characteristic determination unit 161 inputs the type information (LED identification signal) acquired by the type determination unit 150 when the CPU controls the ADC. The characteristic determination unit 161 determines the electric characteristics of the light source unit 200 such as the power to be supplied to the light source unit 200 and the normal range of the input voltage of the light source circuit 220 based on the input type information. For example, the ROM stores in advance a table that collects data representing the correspondence between the type information and the electrical characteristics. When the CPU searches the table stored in the ROM, the characteristic determination unit 161 acquires data representing the electric characteristics corresponding to the type information acquired by the type determination unit 150.

  The power setting unit 162 controls the DAC based on the electrical characteristics of the light source unit 200 determined by the characteristic determination unit 161, so that a signal (LED current switching) that instructs the switching elements Q46 and Q47 to turn on or off. Signal). For example, when the rated value of the current flowing through the light source circuit 220 is 500 mA, the power setting unit 162 generates a signal that turns off the two switching elements Q46 and Q47. When the rated value of the current flowing through the light source circuit 220 is 600 mA, the power setting unit 162 generates a signal for turning on the switching element Q46 and turning off the switching element Q47. When the rated value of the current flowing through the light source circuit 220 is 700 mA, the power setting unit 162 generates a signal that turns off the switching element Q46 and turns on the switching element Q47. When the rated value of the current flowing through light source circuit 220 is 800 mA, power setting unit 162 generates a signal that turns on both switching elements Q46 and Q47.

  Based on the electrical characteristics of the light source unit 200 determined by the characteristic determination unit 161, the threshold switching unit 163 controls the DAC so that the switching element Q77 is turned on or off (light source abnormality detection threshold switching). Signal). For example, when the upper limit value of the normal range of the input voltage of the light source circuit 220 is 35 V and the voltage across the feedback generation circuit 140 is 5 V for a total of 40 V, the threshold switching unit 163 generates a signal for turning off the switching element Q77, The detection voltage generated by the voltage detection circuit 170 is set to 1/20 of the DC voltage generated by the power supply circuit 130. When the upper limit value of the normal range of the input voltage of the light source circuit 220 is 45 V and the voltage across the feedback generation circuit 140 is 5 V, for a total of 50 V, the threshold switching unit 163 generates a signal for turning on the switching element Q77, and detects the voltage The detection voltage generated by the circuit 170 is set to 1/25 of the DC voltage generated by the power supply circuit 130. Thereby, in any case, when the input voltage of the light source circuit 220 exceeds the normal range, the detection voltage generated by the voltage detection circuit 170 exceeds 2 V. Therefore, the threshold voltage for determining the abnormality of the light source circuit 220 is The same 2V is sufficient.

The abnormality determination unit 164 (LED light source unit abnormality detection unit) inputs the detection voltage (light source unit abnormality detection signal) generated by the voltage detection circuit 170 when the CPU controls the ADC. The abnormality determination unit 164 compares the input detection voltage with a predetermined threshold voltage (for example, 2 V) as the CPU processes the data. When the detected voltage is higher than the threshold voltage, the abnormality determining unit 164 determines that an abnormality has occurred.
For example, when the light source 221 has a disconnection failure (open failure), the current flowing through the light source circuit 220 becomes 0, so the feedback voltage generated by the feedback generation circuit 140 also becomes 0. Since the feedback voltage is lower than the predetermined voltage, the power supply circuit 130 increases the generated DC voltage. However, since no current flows through the light source circuit 220, the feedback voltage remains 0. For this reason, the power supply circuit 130 further increases the generated DC voltage. Thus, when the voltage generated by the power supply circuit 130 increases, the detection voltage generated by the voltage detection circuit 170 exceeds the threshold voltage, and the abnormality determination unit 164 determines that an abnormality has occurred.

Further, the abnormality determination unit 164 may be configured to further compare the input detection voltage with the second threshold voltage when the CPU processes the data. Even when the detected voltage is lower than the second threshold voltage, the abnormality determination unit 164 determines that an abnormality has occurred. The second threshold voltage may be a predetermined voltage, or may be configured to be calculated by the threshold switching unit 163 based on the type information acquired by the type determining unit 150.
For example, when the light source 221 has a short circuit failure, the voltage drop in the failed light source 221 becomes 0, so that the corresponding voltage is applied to the other light sources 221, the current flowing through the light source circuit 220 increases, and the feedback generation circuit 140. The feedback voltage generated by increases. Since the feedback voltage is higher than the predetermined voltage, the power supply circuit 130 reduces the generated DC voltage. As a result, the voltage generated by the power supply circuit 130 decreases, the detection voltage generated by the voltage detection circuit 170 falls below the second threshold voltage, and the abnormality determination unit 164 determines that an abnormality has occurred.

  The lighting determination unit 165 generates a signal (light source unit on / off signal) for turning on or off the switch circuit 180 when the CPU controls the DAC. When the abnormality determination unit 164 determines that an abnormality has occurred, the lighting determination unit 165 generates a signal for turning off the switch circuit 180. As a result, an abnormal voltage is prevented from being applied to the light source unit 200 and a failure of the power supply unit 100 is prevented.

Instead of changing the proportional constant of the voltage detection circuit 170 according to the signal generated by the threshold switching unit 163, the voltage detection circuit 170 generates a detection voltage using a predetermined proportional constant, and the threshold switching unit 163 The abnormality determination unit 164 may determine the abnormality by calculating the threshold voltage and comparing the detection voltage generated by the voltage detection circuit 170 with the threshold voltage calculated by the threshold switching unit 163. However, in the configuration in which the abnormality determination unit 164 is realized using a microcomputer, the configuration in which the proportionality constant of the voltage detection circuit 170 is changed according to the signal generated by the threshold switching unit 163 is preferable for the following reason.
The voltage range in which the ADC can be input is determined. Therefore, when the detection voltage is higher than the input voltage range of the ADC, the data converted by the ADC is fixed to the maximum value regardless of the detection voltage. Therefore, abnormality determination unit 164 cannot determine the occurrence of abnormality if the threshold voltage is higher than the ADC input allowable voltage.
The ADC also has a quantization error. The quantization error is determined by the number of bits of digital data output from the ADC and does not depend on the input voltage. Therefore, the higher the input voltage, the better the signal-to-noise ratio (hereinafter referred to as “SN ratio”). For this reason, when the detected voltage is closer to the upper limit of the ADC input allowable voltage range, occurrence of abnormality can be accurately determined.
In the case of changing the threshold voltage while fixing the proportionality constant, when the upper limit of the normal range of the input voltage of the light source circuit 220 is low, if the detection voltage is set to be close to the upper limit of the input voltage range of the ADC, the light source circuit When the upper limit of the normal range of the 220 input voltage is low, the detected voltage exceeds the upper limit of the input voltage range of the ADC, and the occurrence of abnormality cannot be determined. Conversely, when the upper limit of the normal range of the input voltage of the light source circuit 220 is high and the detection voltage is set to be close to the upper limit of the input voltage range of the ADC, the upper limit of the normal range of the input voltage of the light source circuit 220 is low. Therefore, the detection voltage is far from the upper limit of the ADC input voltage range, and accurate determination becomes difficult.
On the other hand, in the case of a configuration in which the proportionality constant is changed with the threshold voltage fixed, the detection voltage is set to be close to the upper limit of the input voltage range of the ADC regardless of the upper limit of the normal range of the input voltage of the light source circuit 220. Therefore, the occurrence of abnormality can always be accurately determined.

  In the power supply unit 100 in this embodiment, the type determination unit 150 acquires type information indicating the type of the light source unit 200 via the connection unit 110 (lighting connection unit), and the light source unit 200 is based on the acquired type information. The power setting unit 162 sets the power to be supplied, and the power supply circuit 130 generates the power to be supplied to the light source unit 200 according to the set power. Therefore, even when the light source unit 200 having different electrical characteristics is connected, the power setting unit 162 is always appropriate. Electric power can be supplied to the light source unit 200.

  In addition, since the type determination unit 150 measures the resistance value between the lighting side terminal a (first lighting connection terminal) and the lighting side terminal b (second lighting connection terminal) as the type information, the light source By simply connecting a resistor having a resistance value corresponding to the electrical characteristics of the unit 200 between the light source side terminal a (first light source connection terminal) and the light source side terminal b (second light source connection terminal), The type of the light source unit 200 can be notified to the power supply unit 100, and the manufacturing cost of the light source unit 200 can be suppressed.

  Further, since the power generated by the power supply circuit 130 is supplied to the light source unit 200 via the lighting side terminal a (first lighting connection terminal) and the lighting side terminal c (third lighting connection terminal), the terminal The number of the power supply units 100 is three, and the manufacturing cost of the power supply unit 100 can be suppressed. In addition, since the voltage applied to the light source circuit 220 also serves as the voltage applied to measure the resistance value of the resistor R52, the power supply unit 100 can be realized with a simple circuit configuration.

  Since the light source unit 200 in this embodiment provides type information indicating the type of the light source unit 200 to the power supply unit 100, the type and electrical characteristics of the light source unit 200 can be notified to the power supply unit 100. Even when there are a plurality of types of light source units 200 having different characteristics, appropriate power can be always supplied from the power supply unit 100.

  Further, since the resistance value of the resistor R52 connected between the light source side terminal a (first light source connection terminal) and the light source side terminal b (second light source connection terminal) is used as the type information, the light source unit 200 is manufactured. Cost can be reduced.

  Further, since the light source 221 is turned on by the power supplied from the power supply unit 100 via the light source side terminal a (first light source connection terminal) and the light source side terminal c (third light source connection terminal), the number of terminals However, the manufacturing cost of the light source unit 200 can be reduced.

  In addition, another connection point d other than the three connection points is provided, and one end of the resistor R52 is not connected to the light source side terminal a, but connected to the light source side terminal d forming the connection point d. Good. An inspection voltage generation circuit is provided on the power supply unit 100 side. The inspection voltage generation circuit generates and outputs an inspection voltage having a predetermined voltage value. The output terminal of the inspection voltage generation circuit is connected to the lighting side terminal d forming the connection point d, and supplies the inspection voltage to the type information output unit 250 of the light source unit 200. Although the potential at the connection point a varies depending on the electrical characteristics of the light source circuit 220, the potential at the connection point d is constant regardless of the electrical characteristics of the light source circuit 220, so that the type information can be acquired correctly. Further, the type information can be acquired even when the light source 221 is not turned on, such as when an abnormality occurs.

  The lighting fixture 800 in this embodiment includes a power supply unit 100 and a light source unit 200. The lighting fixture 800 is an example of a lighting device.

  Note that if the number of circuits connected in parallel in the feedback generation circuit 140 and the voltage detection circuit 170 is increased, the equivalent resistance value can be increased, so that the feedback generation circuit 140 and the voltage detection circuit 170 Proportional constant can be changed in more stages. The feedback generation circuit 140 and the voltage detection circuit 170 are not limited to a configuration in which a plurality of circuits including switching elements are connected in parallel, and equivalent resistance values are not limited to other configurations such as a plurality of circuits including switching elements connected in series. May be used. Moreover, the structure which changes an equivalent resistance value continuously may be sufficient instead of the structure which changes an equivalent resistance value in steps. Further, instead of changing the equivalent resistance value, a configuration in which the proportionality constant is changed by another configuration may be used.

In addition, the type information output unit 250 may be a circuit configured by a semiconductor element such as a regulator, other electronic components, a jumper line, a dip switch, or the like instead of the resistor R52.
Alternatively, the type information output unit 250 may be a circuit including an element whose electrical characteristics change with temperature, such as a thermistor. If the electrical characteristics of the light source circuit 220 change depending on the temperature, the electrical characteristics of the type information output unit 250 may be changed in a form corresponding to the change in the electrical characteristics of the light source circuit 220. A change in electrical characteristics of the light source circuit 220 due to temperature can be compensated.

  As described above, the lighting fixture 800 (lighting device) can perform an optimal operation that meets the conditions according to the type information (LED identification signal), and can ensure safety in the event of a failure. The lighting fixture 800 can cope with variations in brightness of individual light source units 200 (LED light source units) due to differences in color ranks and the like. The lighting fixture 800 does not need to reset the circuit constant of the power supply unit 100 (LED lighting unit portion) even when the number of the light sources 221 (LED) is changed. The lighting fixture 800 can cope with the occurrence of a difference in brightness of the individual light source units 200 due to a difference in temperature, an increase in power due to an increase in forward voltage, and the like. The lighting fixture 800 does not need to reset the protection level even when the forward voltages of the light sources 221 of the individual light source units 200 are different. The lighting fixture 800 enables analysis of a failure mode of the light source unit 200. The lighting fixture 800 can cope with differences in brightness due to differences in the light distribution characteristics of the light sources 221 of the individual light source units 200. The lighting fixture 800 does not need to reset the circuit constants of the power supply unit 100 even when there is an extreme color difference between the individual light source units 200 (for example, a difference between warm white color and daylight color).

Note that the voltage generated at both ends of the resistor R51 of the type determination unit 150 also varies depending on the DC voltage generated by the power supply circuit 130. Therefore, in a plurality of different types of light source units 200, when the DC voltage generated by the power supply circuit 130 varies within a predetermined range, the ranges in which the voltage across the resistor R51 of the type determination unit 150 varies do not overlap. The value of the resistor R52 of the type information output unit 250 is set.
For example, the direct current voltage generated by the power supply circuit 130 may fluctuate in the range of 80V to 120V due to the difference in the electrical characteristics of the light source circuit 220, the value of the resistor R51 is 1 kΩ, and the resistance in a certain type of light source unit 200 If the value of R52 is 39 kΩ, the voltage across the resistor R51 may vary in the range of 2V to 3V.
If the value of the resistor R52 in the light source unit 200 of a different type is 56 kΩ, the voltage across the resistor R51 may vary in the range of 1.4V to 2.11V. For this reason, when the both-ends voltage of resistance R51 is the range of 2V-2.11V, it cannot discriminate | determine which type the light source unit 200 is. Therefore, the value of the resistor R52 is not set to such a value.
If the value of the resistor R52 is 68 kΩ, the voltage across the resistor R51 may vary in the range of 1.16V to 1.74V. If the light source unit is such that the value of the resistor R52 is set to such a value, the power supply unit 100 can determine the type of the light source unit 200 having the value of the resistor R52 of 39 kΩ.

Embodiment 2. FIG.
Embodiment 2 will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the part which is common in Embodiment 1, and description is abbreviate | omitted.

FIG. 4 is a block configuration diagram showing a part of the configuration of the lighting fixture 800 in this embodiment.
In this figure, parts not related to the type acquisition of the light source unit 200 are omitted or simplified.

The type determination unit 150 (type acquisition unit) includes a type voltage measurement circuit 151, a test voltage measurement circuit 152, and a calculation unit 153 in addition to the resistor R51.
The type voltage measurement circuit 151 measures the value of voltage generated at both ends of the resistor R51 (hereinafter referred to as “type voltage”). The type voltage measurement circuit 151 is, for example, a microcomputer ADC. It can also be seen that the current flowing through the resistor R52 (classification information circuit) of the classification information output unit 250 is measured by the resistor R51 and the classification voltage measurement circuit 151.
The test voltage measurement circuit 152 measures the value of the DC voltage (hereinafter referred to as “test voltage”) generated by the power supply circuit 130 (test power generation circuit). The inspection voltage measurement circuit 152 is realized by, for example, a voltage detection circuit 170 and a microcomputer ADC.
The calculation unit 153 calculates a ratio between the inspection voltage measured by the inspection voltage measurement circuit 152 and the type voltage measured by the type voltage measurement circuit 151.
The power supply unit 100 in this embodiment handles the ratio calculated by the calculation unit 153 as type information. The characteristic determination unit 161 determines the electrical characteristics of the light source unit 200 based on the ratio calculated by the calculation unit 153.

  As described in the first embodiment, the voltage generated across the resistor R51 also varies depending on the value of the DC voltage generated by the power supply circuit 130. In this embodiment, the voltage between both ends of the resistor R51 is not directly used as the type information, but the DC voltage generated by the power supply circuit 130 is obtained by using the ratio to the value of the DC voltage generated by the power supply circuit 130 as the type information. Since the change in the voltage across the resistor R51 due to the change in the value of R2 is absorbed, the interval between the resistance values of the resistor R52 can be narrowed, and more types can be discriminated.

For example, in a certain type of light source unit 200, it is assumed that the value of the resistance R52 of the type information output unit 250 is 39 kΩ. When the value of the resistor R51 is 1 kΩ and the value of the DC voltage generated by the power supply circuit 130 is 80V, the voltage across the resistor R51 is 2V. Therefore, the characteristic determination unit 161 uses the value 80 ÷ 2 = 40 as the type information. To do. Further, if the value of the DC voltage generated by the power supply circuit 130 is 120V, the voltage across the resistor R51 is 3V. Therefore, the characteristic determination unit 161 uses the value 120 ÷ 3 = 40 as the type information. That is, regardless of the value of the DC voltage generated by the power supply circuit 130, the type information calculated by the characteristic determination unit 161 is almost the same.
On the other hand, if the value of the resistor R52 is 47 kΩ in different types of light source units, the voltage across the resistor R51 is 2.5V when the value of the DC voltage generated by the power supply circuit is 120V. The characteristic determination unit 161 uses the value 120 ÷ 2.5 = 48 as the type information. Therefore, the type can be determined with respect to the light source unit 200 having a resistance R52 value of 39 kΩ.

  The power supply unit 100 in this embodiment measures the value of the voltage generated by the power supply circuit 130 (test power generation circuit) and the value of the current flowing through the resistor R52 (type information circuit) of the type information output unit 250, and measures the value. Since the type information is calculated by performing an operation such as taking a ratio of the obtained values, the light source units 200 of different types can be discriminated regardless of the variation in the inspection voltage.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIGS.
Note that portions common to Embodiment 1 or Embodiment 2 are denoted by the same reference numerals and description thereof is omitted.

FIG. 5 is a block configuration diagram showing a part of the configuration of the lighting fixture 800 in this embodiment.
The resistor R52 (type information circuit) of the type information output unit 250 of the light source unit 200 is electrically connected between the light source side terminal b and the light source side terminal c. One end of the resistor R52 may be electrically connected to the light source side terminal a instead of the light source side terminal c, or is electrically connected to another light source side terminal different from the light source side terminal a and the light source side terminal c. May be.
The power supply unit 100 includes a test current generation circuit 135. The inspection current generation circuit 135 (inspection power generation circuit) is a constant current source that generates a direct current (hereinafter referred to as “inspection current”) having a predetermined current value. The inspection current generation circuit 135 is electrically connected between the power supply side terminal b and the power supply side terminal c. The test current generation circuit 135 is electrically connected to the power supply side terminal connected to the light source side terminal to which the resistor R52 is connected so that the generated test current flows through the resistor R52 of the type information output unit 250.
The type voltage measurement circuit 151 measures the value of the voltage (inspection voltage) applied to the resistor R52 by the inspection current generation circuit 135. The power supply unit 100 in this embodiment handles the inspection voltage measured by the type voltage measuring circuit 151 as type information.

  As described above, the inspection current generation circuit 135 is provided separately from the power supply circuit 130, and the inspection current supplied to the resistor R52 (classification information circuit) of the classification information output unit 250 is generated, whereby the electrical characteristics of the light source circuit 220 are improved. Even if the value of the DC voltage generated by the power supply circuit 130 varies due to a difference or the like, the value of the voltage measured by the type voltage measuring circuit 151 does not change, and the type of the light source unit 200 can be correctly determined.

FIG. 6 is a block configuration diagram showing another example of the configuration of the lighting fixture 800 in this embodiment.
The power supply unit 100 includes a test voltage generation circuit 136 instead of the test current generation circuit 135. The inspection voltage generation circuit 136 (inspection power generation circuit) is a constant voltage source that generates a DC voltage (inspection voltage) having a predetermined voltage value. The inspection voltage generated by the inspection voltage generation circuit 136 is applied to the resistor R52 (type information circuit) of the type information output unit 250.
In addition, the power supply unit 100 includes a test current measurement circuit 154 instead of the type voltage measurement circuit 151. The inspection current measuring circuit 154 measures the current (inspection current) flowing through the resistor R52 (type information circuit) of the type information output unit 250. The power supply unit 100 in this example handles the inspection current measured by the inspection current measuring circuit 154 as type information.

  Thus, the combination of the constant voltage source and the current measurement can correctly determine the type of the light source unit 200 regardless of fluctuations in the value of the DC voltage generated by the power supply circuit 130.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIG.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 7 is an electric circuit diagram showing an example of a circuit configuration of the lighting fixture 800 in this embodiment.

  In addition to the three terminals described in the first embodiment, the connection unit 110 and the connection unit 210 are connected to terminals that form connection points d (referred to as “lighting side terminals d” and “light source side terminals d”, respectively). And a terminal that forms a point e (referred to as “lighting side terminal e” and “light source side terminal e”, respectively).

  The light source unit 200 includes a memory IC 251 (type information storage unit). The memory IC 251 (type information output unit 250, usage time providing unit) preliminarily stores data indicating the type information of the light source unit 200 (hereinafter referred to as “type data”) and the usage time (energization time) of the light source unit 200. Data to be expressed (hereinafter referred to as “use time data”) is stored. Of these, at least the usage time data can be rewritten. The memory IC 251 includes a pair of power input terminals for applying a power supply voltage necessary for operation, and a data input / output terminal for reading and writing data. The positive voltage side terminal of the pair of power input terminals is electrically connected to the light source side terminal d. Of the pair of power input terminals, the negative voltage side terminal is electrically connected to the light source side terminal e. The data input / output terminal is electrically connected to the light source side terminal b.

The power supply unit 100 has a control power supply circuit 190 in addition to the configuration described in the first embodiment.
The control power supply circuit 190 generates a power supply voltage (for example, 3 V) necessary for the operation of the microcomputer of the memory IC 251 and the lighting control unit 160. For example, the control power supply circuit 190 generates a power supply voltage by stepping down the DC voltage generated by the power supply circuit 130 using a regulator or the like. The control power supply circuit 190 has a pair of output terminals for outputting the generated power supply voltage. The output terminal on the positive voltage side is electrically connected to the lighting side terminal d. The output terminal on the negative voltage side is electrically connected to the ground wiring in the power supply unit 100.
The lighting side terminal e is electrically connected to the ground wiring. As a result, the power supply voltage generated by the control power supply circuit 190 is applied to the memory IC 251 of the light source unit 200 via the connection point d and the connection point e.

The feedback generation circuit 140 includes a variable resistance circuit V45. The voltage detection circuit 170 has a variable resistance circuit V75. The resistance values of variable resistance circuits V45 and V75 change in accordance with a signal indicating an instruction from lighting control unit 160.
Switch circuit 180 is a switch that opens and closes in accordance with a signal representing an instruction from lighting control unit 160.
The variable resistance circuits V45 and V75 and the switch circuit 180 may be configured by one component, or may be configured by a plurality of components such as the circuit shown in the first embodiment. Good.

The lighting control unit 160 operates with the power supply voltage generated by the control power supply circuit 190. The lighting control unit 160 has a pair of power input terminals for inputting a power supply voltage. The power input terminal on the positive voltage side is electrically connected to the output terminal on the positive voltage side of the control power supply circuit 190. The power input terminal on the negative voltage side is electrically connected to the output terminal on the negative voltage side of the control power circuit 190 via the ground wiring.
The lighting control unit 160 includes a usage time reading unit 155, a usage time measuring unit 156, and a usage time writing unit 157 in addition to the functional blocks described in the first embodiment. In this example, the type determination unit 150 is a part of the lighting control unit 160.

  The type determination unit 150 generates and outputs a signal for reading the type data from the memory IC 251 when the CPU controls the output device. In accordance with this signal, the memory IC 251 generates and outputs a signal representing the type data stored in advance. The type determination unit 150 receives a signal output from the memory IC 251 by the CPU controlling the input device, and acquires type data.

The usage time reading unit 155 generates and outputs a signal for reading usage time data from the memory IC 251 by the CPU controlling the output device. In accordance with this signal, the memory IC 251 generates and outputs a signal representing usage time data stored in advance. The usage time reading unit 155 receives a signal output from the memory IC 251 by the CPU controlling the input device, and acquires usage time data.
The usage time measuring unit 156 measures the usage time of the light source unit 200 by the CPU processing the data based on the usage time data acquired by the usage time reading unit 155. For example, the usage time measuring unit 156 measures the time during which the power supply unit 100 supplies power to the light source unit 200, and adds 1 to the usage time data every time 1 hour elapses.
The usage time writing unit 157 generates and outputs a signal for writing data representing the usage time measured by the usage time measuring unit 156 to the memory IC 251 by the CPU controlling the output device. In accordance with this signal, the memory IC 251 rewrites the usage time data stored in advance and stores new usage time data.
Thereby, since the light source unit 200 itself stores the usage time of the light source unit 200, even when the light source unit 200 in use is replaced, connected to another power supply unit 100, or restored, the light source unit 200 is used. Can be measured correctly.

The characteristic determination unit 161 processes the data based on the type data acquired by the type determination unit 150 and the usage time measured by the usage time measurement unit 156, so that the power to be supplied to the light source unit 200 The electrical characteristics of the light source unit 200 such as the normal range of the input voltage of the light source circuit 220 are determined. For example, when the brightness of the light source 221 decreases due to aging, the same brightness can be maintained by increasing the power supplied to the light source circuit 220. Therefore, the power to be supplied to the light source circuit 220 in order to maintain the same brightness increases as the usage time increases.
Specifically, for example, in addition to a table that collects data representing the correspondence between the type information and the electrical characteristics when not in use, the ROM stores in advance data representing a predetermined luminance reduction compensation coefficient calculation formula. deep. As in the first embodiment, the CPU searches the table stored in the ROM, so that the characteristic determination unit 161 corresponds to the type information represented by the type data acquired by the type determination unit 150 (when not in use). Acquire data representing characteristics. In addition, the characteristic determination unit 161 calculates a luminance reduction compensation coefficient by the CPU calculating the result of substituting the usage time indicated by the usage time data into the luminance reduction compensation coefficient calculation formula expressed by the data stored in the ROM. The characteristic determination unit 161 calculates the power to be supplied to the light source circuit 220 when the CPU calculates a product obtained by multiplying the power represented by the acquired electrical characteristics and the calculated luminance reduction compensation coefficient.
Similarly, the normal range of the input voltage of the light source circuit 220 also changes depending on the usage time. For example, if the power supplied to the light source circuit 220 changes, the normal range of the input voltage of the light source circuit 220 also changes due to the voltage-current characteristics of the light source circuit 220. The characteristic determination unit 161 calculates the normal range of the input voltage of the light source circuit 220 based on, for example, the usage time or the power to be supplied to the light source circuit 220 calculated from the usage time.

  The light source unit 200 in this embodiment provides usage time information (usage time data) indicating usage time of the light source unit 200 to the power supply unit 100 connected to the connection unit 210 via the connection unit 210. Therefore, even when the electrical characteristics of the light source unit 200 change depending on the usage time, it is possible to always receive an appropriate power supply from the power supply unit 100.

  The power supply unit 100 in this embodiment uses usage time information (usage time data) representing usage time of the light source unit 200 from the light source unit 200 connected to the connection unit 110 via the connection unit 110 to a usage time acquisition unit (use time). The power setting unit 162 sets the power to be supplied to the light source unit 200 based on the type information (type data) acquired by the reading unit 155) and acquired by the type determining unit 150 and the usage time information acquired by the usage time acquisition unit. Therefore, even when the electrical characteristics of the light source unit 200 change depending on the usage time, it is possible to always supply appropriate power to the light source unit 200.

  The usage time measurement unit 156 measures the time during which the power supply circuit 130 supplies power to the light source unit 200, and the usage time represented by the usage time information acquired by the usage time acquisition unit and the usage time measurement unit 156 measure the usage time. The usage time of the light source unit 200 is calculated by adding the measured time, and the usage time calculated by the usage time measurement unit 156 via the connection unit 110 is written to the light source unit 200 connected to the connection unit 110. Since the unit 157 writes, the usage time of the light source unit 200 can be correctly grasped.

  Note that the memory IC 251 may store the electrical characteristics of the light source unit 200 (when not in use) as it is as type information. For example, the memory IC 251 stores data indicating power to be supplied to the light source unit 200 when not in use and data indicating a normal range of input voltage (maximum voltage / minimum voltage, etc.) as type data. In this case, the characteristic determination unit 161 does not need to convert the type information into the electrical characteristics of the light source unit 200, and therefore the ROM does not need to store a table or the like in advance in order to convert the type information into the electrical characteristics. .

  The light source unit 200 may have a data input unit for inputting data in addition to the light source side terminal b in order to rewrite data stored in the memory IC 251. For example, a remote control light receiving circuit may be provided as a data input unit so that data stored in the memory IC 251 can be rewritten based on a signal from a remote control received by the remote control light receiving circuit.

  Further, the memory IC 251 and the lighting control unit 160 may be configured to operate using the potential of the light source side terminal c as a reference potential instead of the ground wiring in the power supply unit 100. Out of the output terminals of the control power supply circuit 190, the output terminal on the negative voltage side is electrically connected to the lighting side terminal c instead of the ground wiring. Similarly, the negative voltage side terminal among the power input terminals of the lighting control unit 160 is electrically connected to the lighting side terminal c. Further, the negative voltage side terminal among the power input terminals of the memory IC 251 is electrically connected to the light source side terminal c. Thereby, since the lighting side terminal e and the light source side terminal e which form the connection point e become unnecessary, the manufacturing cost of the power supply unit 100 and the light source unit 200 can be held down.

  Further, a control power supply circuit that generates a power supply voltage necessary for the operation of the memory IC 251 (hereinafter referred to as “power source circuit in the light source”) may be provided inside the light source unit 200. For example, the in-light source power supply circuit generates a power supply voltage to be applied to the memory IC 251 from a voltage applied between the light source side terminal a and the light source side terminal c. Alternatively, depending on the power supply voltage allowable range of the memory IC 251, the power input terminal on the positive voltage side of the memory IC 251 may be directly electrically connected to the light source side terminal a. Thereby, since the light source side terminal d and the lighting side terminal d which form the connection point d become unnecessary, the manufacturing cost of the power supply unit 100 and the light source unit 200 can be held down.

  As described above, the lighting fixture 800 can cope with a decrease in brightness due to deterioration of the light source 221 over time.

Embodiment 5 FIG.
The fifth embodiment will be described with reference to FIG.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 8 is an electric circuit diagram showing an example of a circuit configuration of the lighting fixture 800 in this embodiment.

  The connection part 110 has three terminals of lighting side terminals a, c, and d. Corresponding to this, the connection part 210 has three terminals of the light source side terminals a, c, and d.

  In the light source unit 200, the type information output unit 250 (current adjustment circuit) includes a resistor R53 (correction generation circuit). The resistor R53 is electrically connected between the light source side terminal d and the light source side terminal c. The resistor R53 generates a correction current for correcting the current flowing through the light source circuit 220.

The control power supply circuit 190 generates a predetermined DC voltage (for example, 3V) applied to the resistor R53. The output terminal on the positive voltage side of the control power circuit 190 is electrically connected to the lighting side terminal d. The output terminal on the negative voltage side of the control power supply circuit 190 is electrically connected to the ground wiring in the power supply unit 100.
The DC voltage generated by the control power supply circuit 190 is applied to the resistor R53 via the connection point d. A current (correction current) that is inversely proportional to the resistance value of the resistor R53 flows through the resistor R53.

The feedback generation circuit 140 includes a resistor R41. Unlike the first embodiment, there is no resistance or switching element connected in parallel to the resistor R41, so the proportionality constant that the feedback generation circuit 140 generates the feedback voltage is a predetermined value determined by the resistance value of the resistor R41.
In the feedback generation circuit 140, a current obtained by combining the current flowing through the light source circuit 220 and the correction current flowing through the resistor R53 flows. Therefore, when the DC voltage generated by the power supply circuit 130 is adjusted so that the feedback voltage generated by the feedback generation circuit 140 becomes a predetermined voltage, the sum of the current flowing through the light source circuit 220 and the correction current becomes a predetermined current value. Become. That is, the current flowing through the light source circuit 220 has a difference current value obtained by subtracting the correction current from a predetermined current value.

  Here, the DC voltage generated by the control power supply circuit 190 is a predetermined voltage value. Further, the DC voltage generated by the power supply circuit 130 is adjusted so that the feedback voltage becomes a predetermined voltage value. Since the voltage applied to both ends of the resistor R53 is a difference voltage value obtained by subtracting the feedback voltage from the DC voltage generated by the control power supply circuit 190, it can be considered to be a substantially constant value. Therefore, when the resistance value of the resistor R53 is determined, the current value of the correction current is determined.

  Depending on the type of the light source unit 200, the current value of the current flowing through the light source circuit 220 is different. Among these, the resistance value (proportional constant) of the resistor R41 is set with reference to the light source unit 200 having the largest current flowing through the light source circuit 220. That is, when the sum of the current flowing through the light source circuit 220 and the correction current is equal to the current flowing through the light source circuit 220 in the light source unit 200 with the largest current flowing through the light source circuit 220 (hereinafter referred to as “maximum current”). The resistance value (proportional constant) of the resistor R41 is set so that the feedback voltage generated by the feedback generation circuit 140 becomes a predetermined voltage targeted by the power supply circuit 130.

  When the light source unit 200 is the light source unit 200 with the largest current flowing through the light source circuit 220, the resistor R53 is not provided and the light source side terminal d is opened. Alternatively, a resistor having a very large resistance value is set as a resistor R53. Therefore, (almost) no correction current flows. The maximum current flows through the light source circuit 220 by adjusting the DC voltage generated by the power supply circuit 130.

  When the light source unit 200 is not the light source unit 200 with the largest current flowing through the light source circuit 220, a resistor R53 is provided, and the resistor R53 is set so that the correction current becomes a difference current value obtained by subtracting the current flowing through the light source circuit 220 from the maximum current. Set the resistance value. By adjusting the DC voltage generated by the power supply circuit 130, a current having a desired current value (a current value obtained by subtracting the correction current from the maximum current) flows in the light source circuit 220.

  As described above, the light source unit 200 notifies the power supply unit 100 of information (type information) regarding the current value of the current flowing through the light source circuit 220 in the form of a correction current. In the power supply unit 100, the feedback generation circuit 140 acquires the type information notified as the correction current, and generates a feedback voltage corrected by the correction current. Accordingly, a desired current can be passed through the light source circuit 220 regardless of the type of the light source unit 200.

The resistor R53 may be a fixed resistor whose resistance value is fixed, or may be a semi-fixed resistor or a variable resistor whose resistance value can be varied. When the variation in the electrical characteristics of the light source 221 is large, it is preferable that the resistance value of the resistor R53 be variable. Then, for example, in the manufacturing process of the light source unit 200, after the assembly of the light source unit 200 is completed, the electrical characteristics of the light source circuit 220 are measured, and the current value of the current passed through the light source circuit 220 based on the measured electrical characteristics. And the resistance value of the resistor R53 can be adjusted.
Alternatively, the type information output unit 250 may be a circuit including an element whose electrical characteristics change with temperature, such as a thermistor. If the electrical characteristics of the light source circuit 220 change depending on the temperature, the electrical characteristics of the type information output unit 250 may be changed in a form corresponding to the change in the electrical characteristics of the light source circuit 220. A change in electrical characteristics of the light source circuit 220 due to temperature can be compensated.

  In the light source unit 200 in this embodiment, a correction current for correcting the current flowing through the light source circuit 220 is generated by the correction generation circuit (resistor R53) and used as the type information provided by the type information output unit 250. In the unit 100, the current flowing through the light source circuit 220 can be set to a desired current value by adjusting the DC voltage generated by the power supply circuit 130 so that the total current including the correction current becomes a predetermined current. Therefore, the power supply unit 100 can be realized with a simple configuration, and the manufacturing cost can be reduced.

  Note that the DC voltage generated by the control power supply circuit 190 has a voltage value as close as possible to the predetermined voltage value targeted by the power supply circuit 130, and thus the voltage applied to both ends of the resistor R53 becomes lower. It is desirable because power loss is suppressed. However, if the DC voltage generated by the control power supply circuit 190 is too close to the predetermined voltage value targeted by the power supply circuit 130, the DC voltage generated by the control power supply circuit 190 or the predetermined voltage value targeted by the power supply circuit 130 will be described. It is desirable not to be too close, because the effect of errors in the case becomes large. Therefore, the difference between the voltage value of the DC voltage generated by the control power supply circuit 190 and the predetermined voltage value targeted by the power supply circuit 130 is most desirably about 1 V, for example.

  The type information that can be represented by the correction current is information on the current (electric power to be supplied to the light source unit 200) that flows through the light source circuit 220. In order to provide other information to the power supply unit 100, such as type information such as a normal range of the input voltage of the light source unit 200 and information about the usage time of the light source unit 200, the configuration and implementation of this embodiment It is good also as a structure which combined the structure in any one of Embodiment 1 thru | or Embodiment 4.

Embodiment 6 FIG.
Embodiment 6 will be described with reference to FIG.
In addition, about the part which is common in Embodiment 5, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 9 is an electric circuit diagram showing an example of a circuit configuration of the lighting fixture 800 in this embodiment.

The connection part 110 has three terminals of lighting side terminals a, c, and e. Corresponding to this, the connection part 210 has three terminals of the light source side terminals a, c, and e.
The resistor R53 is electrically connected between the light source side terminal c and the light source side terminal e. The resistor R53 generates a correction current for correcting the current flowing through the light source circuit 220.
The lighting side terminal e is electrically connected to the ground wiring in the power supply unit 100.

  A voltage having a voltage value equal to the feedback voltage generated by the feedback generation circuit 140 is applied to both ends of the resistor R53. Since the power supply circuit 130 adjusts the generated DC voltage so that the feedback voltage has a predetermined voltage value, the voltage applied across the resistor R53 can be considered to be substantially constant. Therefore, when the resistance value of the resistor R53 is determined, the current value of the correction current is determined.

  A current having a difference current value obtained by subtracting the correction current from the current flowing through the light source circuit 220 flows through the feedback generation circuit 140. As a result of adjusting the DC voltage generated by the power supply circuit 130 so that the feedback voltage generated by the feedback generation circuit 140 becomes a predetermined voltage value, a current obtained by adding a correction current to the predetermined current value flows to the light source circuit 220. .

  The resistance value (proportional constant) of the resistor R41 is set based on the light source unit 200 having the smallest current flowing through the light source circuit 220 among the various types of light source units 200. That is, when the difference obtained by subtracting the correction current from the current flowing through the light source circuit 220 is equal to the current flowing through the light source circuit 220 in the light source unit 200 with the smallest current flowing through the light source circuit 220 (hereinafter referred to as “minimum current”). The resistance value (proportional constant) of the resistor R41 is set so that the feedback voltage generated by the feedback generation circuit 140 becomes a predetermined voltage targeted by the power supply circuit 130.

  When the light source unit 200 is the light source unit 200 with the smallest current flowing through the light source circuit 220, the resistor R53 is not provided and the light source side terminal e is opened. Alternatively, a resistor having a very large resistance value is set as a resistor R53. Therefore, (almost) no correction current flows. By adjusting the DC voltage generated by the power supply circuit 130, a minimum current flows through the light source circuit 220.

  When the light source unit 200 is not the light source unit 200 with the smallest current flowing through the light source circuit 220, a resistor R53 is provided, and the resistor R53 is set so that the correction current has a difference value obtained by subtracting the minimum current from the current flowing through the light source circuit 220. Set the resistance value. By adjusting the DC voltage generated by the power supply circuit 130, a current having a desired current value (a current value obtained by adding a correction current to the minimum current) flows in the light source circuit 220.

  In this manner, contrary to the fifth embodiment, by passing the current obtained by subtracting the correction current to the feedback generation circuit 140, the current flowing through the light source circuit 220 can be increased by the correction current.

  In the light source unit 200 in this embodiment, a correction current for correcting the current flowing through the light source circuit 220 is generated by the correction generation circuit (resistor R53) and used as the type information provided by the type information output unit 250. In the unit 100, the current flowing through the light source circuit 220 can be set to a desired current value by adjusting the DC voltage generated by the power supply circuit 130 so that the current obtained by subtracting the correction current becomes a predetermined current. Therefore, the power supply unit 100 can be realized with a simple configuration, and the manufacturing cost can be reduced.

  As in the fifth embodiment, the resistor R53 may be a fixed resistor having a fixed resistance value, a semi-fixed resistor or a variable resistor whose resistance value can be changed, and a resistance value depending on temperature. It may be an element such as a thermistor that changes.

  Similarly to the fifth embodiment, the configuration of this embodiment may be combined with the configurations of the first to fourth embodiments, or may be combined with the configuration of the fifth embodiment. Good. By combining with the structure of Embodiment 5, the current flowing through the light source circuit 220 can be increased or decreased.

Embodiment 7 FIG.
A seventh embodiment will be described with reference to FIG.
In addition, about the part which is common in Embodiment 5, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 10 is an electric circuit diagram showing an example of a circuit configuration of the lighting fixture 800 in this embodiment.

The connection part 110 has three terminals of lighting side terminals a, b, and c. Corresponding to this, the connection part 210 has three terminals of the light source side terminals a, b, and c.
The light source circuit 220 is electrically connected between the light source side terminal a and the light source side terminal b. The resistor R53 (correction generation circuit) is electrically connected between the light source side terminal b and the light source side terminal c. The resistor R53 generates a correction voltage for correcting the current flowing through the light source circuit 220.
The lighting side terminal b is electrically connected to the feedback input terminal of the power supply circuit 130.

The same current as the current flowing through the light source circuit 220 flows through the resistor R53. A voltage (correction voltage) proportional to the current flowing through the resistor R53 and the resistance value of the resistor R53 is generated at both ends of the resistor R53.
The power supply circuit 130 adjusts the generated DC voltage so that a total voltage obtained by adding the feedback voltage generated by the feedback generation circuit 140 and the correction voltage generated at both ends of the resistor R53 becomes a predetermined voltage value. Therefore, the current flowing through the light source circuit 220 is smaller than when there is no correction voltage.

  The resistance value (proportional constant) of the resistor R41 is set based on the light source unit 200 having the largest current flowing through the light source circuit 220 among the various types of light source units 200. That is, when the current flowing through the light source circuit 220 is equal to the maximum current, the resistance value (proportional constant) of the resistor R41 is set so that the feedback voltage generated by the feedback generation circuit 140 becomes a predetermined voltage targeted by the power supply circuit 130. Set.

  When the light source unit 200 is the light source unit 200 having the largest current flowing through the light source circuit 220, the resistor R53 is not provided and the light source side terminal b and the light source side terminal c are short-circuited. Alternatively, a resistor having a very small resistance value is set as a resistor R53. Therefore, the correction voltage is (almost) 0. The maximum current flows through the light source circuit 220 by adjusting the DC voltage generated by the power supply circuit 130.

  When the light source unit 200 is not the light source unit 200 with the largest current flowing through the light source circuit 220, a resistor R53 is provided, and a correction voltage generated at both ends of the resistor R53 when a desired current flows through the light source circuit 220, and feedback generation The resistance value of the resistor R53 is set such that the sum of the feedback voltage generated by the circuit 140 becomes a predetermined voltage value targeted by the power supply circuit 130. By adjusting the DC voltage generated by the power supply circuit 130, a current having a desired current value flows through the light source circuit 220.

  As described above, the light source unit 200 notifies the power supply unit 100 of information (type information) regarding the current value of the current flowing through the light source circuit 220 in the form of a correction voltage. In the power supply unit 100, the power supply circuit 130 acquires the type information notified as the correction voltage, and generates a DC voltage corrected by the correction voltage. Accordingly, a desired current can be passed through the light source circuit 220 regardless of the type of the light source unit 200.

  The feedback generation circuit 140 may not be provided. In this case, the power supply circuit 130 adjusts the generated DC voltage so that the voltage generated at both ends of the correction generation circuit (resistor R53) becomes a target predetermined voltage value.

  Further, the type information output unit 250 may be a circuit including an element whose electrical characteristics change with temperature, such as a thermistor. If the electrical characteristics of the light source circuit 220 change depending on the temperature, the electrical characteristics of the type information output unit 250 may be changed in a form corresponding to the change in the electrical characteristics of the light source circuit 220. A change in electrical characteristics of the light source circuit 220 due to temperature can be compensated.

  Thus, instead of correcting the current flowing through the light source circuit 220 with the correction current, the current flowing through the light source circuit 220 can be reduced by correcting the current flowing through the light source circuit 220 with the correction voltage.

  In the light source unit 200 of this embodiment, the correction voltage for correcting the current flowing through the light source circuit 220 is generated by the correction generation circuit (resistor R53) and used as the type information provided by the type information output unit 250. In the unit 100, the current flowing through the light source circuit 220 is adjusted to a desired current value by adjusting the DC voltage generated by the power supply circuit 130 so that the total voltage of the feedback voltage and the correction voltage becomes a predetermined voltage value. can do. Therefore, the power supply unit 100 can be realized with a simple configuration, and the manufacturing cost can be reduced.

  As in the fifth and sixth embodiments, the resistor R53 may be a fixed resistor whose resistance value is fixed, or may be a semi-fixed resistor or a variable resistor whose resistance value can be varied. An element such as a thermistor whose resistance value varies with temperature may be used.

Moreover, it is good also as a structure which combined the structure of this Embodiment and at least any one structure among Embodiment 1 thru | or Embodiment 6. FIG.
Embodiment 8 FIG.
An eighth embodiment will be described with reference to FIGS.
Note that portions common to Embodiments 1 to 7 are denoted by the same reference numerals and description thereof is omitted.

FIG. 11 is an overall perspective view showing the appearance of the display device 801 in this embodiment.
The display device 801 includes a display panel 820. The display device 801 is a guide light device, and an evacuation guide symbol is displayed on the display panel 820 by printing or the like. Note that the display device 801 is not limited to the guide light device, and the display panel 820 may display other symbols.

FIG. 12 is an exploded perspective view showing the internal structure of the display device 801 in this embodiment.
In addition to the display panel 820, the display device 801 includes a case 810, a power supply unit 100, a light source unit 200, a light source unit holder 830, and the like.
The case 810 is a case that covers the power supply unit 100 and the light source unit 200.
The power supply unit 100 is the power supply unit described in the first to seventh embodiments, and includes the connection unit 110.
The light source unit 200 is the light source unit described in the first to seventh embodiments, and includes the connection unit 210.
The two connection parts 110 and 210 are connected to each other. The light source unit 200 is supplied with electric power from the power supply unit 100 through the connected connecting portions 110 and 210, and turns on the built-in light source 221.
The display panel 820 illuminates the displayed symbol with light emitted from the light source 221 of the light source unit 200.
The light source unit holder 830 is engaged with the case 810 and the display panel 820 to fix the light source unit 200 and the display panel 820 to the case 810.

As described above, the power supply unit 100 and the light source unit described in Embodiments 1 to 7 are applicable not only to the lighting fixture 800 but also to other devices having an electrical light source such as the display device 801.
Thereby, the effect similar to the effect demonstrated in Embodiment 1- Embodiment 7 can be acquired.

  DESCRIPTION OF SYMBOLS 100 Power supply unit, 110, 210 connection part, 130 Power supply circuit, 135 Inspection current generation circuit, 136 Inspection voltage generation circuit, 140 Feedback generation circuit, 150 Type determination part, 151 Type voltage measurement circuit, 152 Inspection voltage measurement circuit, 153 Operation Unit, 154 inspection current measurement circuit, 155 usage time reading unit, 156 usage time measurement unit, 157 usage time writing unit, 160 lighting control unit, 161 characteristic determination unit, 162 power setting unit, 163 threshold switching unit, 164 abnormality determination Unit, 165 lighting determination unit, 170 voltage detection circuit, 180 switch circuit, 190 control power circuit, 200 light source unit, 220 light source circuit, 221 light source, 250 type information output unit, 251 memory IC, 800 lighting fixture, 810 case, 820 Display panel, 830 Light source unit holder -, Q46, Q47, Q77, Q83, Q86 switching elements, R41, R42, R43, R51, R52, R53, R71, R72, R73, R81, R82, R84, R85 resistors, V45, V75 variable resistance circuits.

Claims (10)

Lighting connection,
A type acquisition unit that acquires type information representing the type of the light source unit from the light source unit connected to the lighting connection unit via the lighting connection unit;
A power setting unit for setting power to be supplied to the light source unit based on the type information acquired by the type acquisition unit;
A power supply circuit that generates power to be supplied to the light source unit according to the power set by the power setting unit;
A test power generation circuit that generates test power supplied to the light source unit separately from the power generated by the power supply circuit;
Have
The lighting connection is
A first lighting connection terminal a for supplying power generated by the power supply circuit to the light source unit; and a second lighting connection terminal b different from the first lighting connection terminal a; The power supply unit, wherein the test power generated by the test power generation circuit is supplied to the unit via the second lighting connection terminal b .   The lighting connection part further includes
  The first lighting connection terminal a and the second lighting connection terminal b have a third lighting connection terminal c different from the first lighting connection terminal a and the third lighting connection terminal a. The power generated by the power supply circuit is supplied via the lighting connection terminal c, and the inspection power generation is generated for the light source unit via the second lighting connection terminal b and the third lighting connection terminal c. The power supply unit according to claim 1, wherein the inspection power generated by the circuit is supplied.   The lighting connection part further includes
  A third lighting connection terminal c different from the first lighting connection terminal a and the second lighting connection terminal b, the first lighting connection terminal a, the second lighting connection terminal b, and the third A fourth lighting connection terminal d different from the lighting connection terminal c, and the power source is connected to the light source unit via the first lighting connection terminal a and the third lighting connection terminal c. Supplying the power generated by the circuit and supplying the test light generated by the test power generation circuit to the light source unit via the second lighting connection terminal b and the fourth lighting connection terminal d. The power supply unit according to claim 1, wherein:   The power supply unit according to claim 1, wherein the test power generation circuit generates a test voltage having a predetermined voltage value as the test power. A light source connection to be connected to the power supply unit;
A light source that is lit by the power for the light source supplied from the power supply unit connected to the light source connection unit via the light source connection unit;
Have a type information output unit for outputting the type information to the power supply unit connected to the light source connection portion representing the type of the light source unit itself through the light source connecting portion,
The light source connection unit includes a first light source connection terminal a and a second light source connection terminal b different from the first light source connection terminal a.
The type information output unit is an inspection power that is electrically connected to the second light source connection terminal b and is supplied from the power supply unit via the second light source connection terminal b. With a test power generated separately, a type information circuit in which a voltage is generated and a current flows is provided,
The type information output unit outputs the voltage generated in the type information circuit or the current flowing through the type information circuit as the type information,
The light source is turned on by the power for light source supplied from the power source unit connected to the light source connection portion via the first light source connection terminal a . The light source connection part further includes
The first light source connection terminal a and the second light source connection terminal b are different from the third light source connection terminal c,
The type information output unit is electrically connected between the second light source connection terminal b and the third light source connection terminal c, and the second light source connection terminal b and the third light source connection terminal c. By means of the inspection power supplied from the power supply unit via, a voltage is generated and a type information circuit through which a current flows is provided,
The type information output unit outputs the voltage generated in the type information circuit or the current flowing through the type information circuit as the type information,
The light source is lit by the power for the light source supplied from the power source unit connected to the light source connection portion via the first light source connection terminal a and the third light source connection terminal c. The light source unit according to claim 5. The light source connection part further includes
The first light source connection terminal a and the second light source connection terminal b are different from the third light source connection terminal c, the first light source connection terminal a, the second light source connection terminal b, and the third light source connection terminal a. A fourth light source connection terminal d different from the light source connection terminal c of
The type information output unit is electrically connected between the second light source connection terminal b and the fourth light source connection terminal d, and the second light source connection terminal b and the fourth light source connection terminal d. By means of the inspection power supplied from the power supply unit via, a voltage is generated and a type information circuit through which a current flows is provided,
The type information output unit outputs the voltage generated in the type information circuit or the current flowing through the type information circuit as the type information,
The light source is lit by the power for the light source supplied from the power source unit connected to the light source connection portion via the first light source connection terminal a and the third light source connection terminal c. The light source unit according to claim 5.   A light source connection to be connected to the power supply unit;
  A light source that is lit by the power supplied from the power source unit connected to the light source connection unit via the light source connection unit;
  A type information output unit that outputs type information representing the type of the light source unit itself to the power source unit connected to the light source connection unit via the light source connection unit;
  The type information output unit includes a correction generation circuit that generates a correction voltage or a correction current for correcting the current flowing through the light source, and outputs the correction voltage or the correction current generated by the correction generation circuit as type information. A light source unit characterized by that.   An illumination apparatus comprising: the power supply unit according to claim 1; and a light source unit connected to a lighting connection portion of the light source unit.   It has a power supply unit in any one of Claims 1-4, the light source unit connected to the lighting connection part of the said light source unit, and the display part illuminated by the light which the light source of the said light source unit radiates | emits. A display device.

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