JP5260953B2 - Light source lighting device, lighting fixture, lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To light on a light source by preventing further reduction of an input voltage when the input voltage from a direct current supply line is reduced since impedance of the direct current supply line increases. <P>SOLUTION: A light source lighting device 1 is connected to a direct current power supply E via a pair of the direct current supply lines Wdc, and lights on a light source 2 by receiving electric power supply from the direct current power supply E. A measuring means switches a first operation state and a second operation state which are mutually different in light output of the light source 2, and measures the impedance of the direct current supply lines Wdc by dividing a differential between the input voltage Vin in the first operation state and the input voltage Vin in the second operation state by the differential between the input current Iin in the second operation state and the input current Iin in the first operation state. A control means makes the light output of the light source 2 as the light output at the time of stationary lighting if the impedance of the direct current supply lines Wdc measured by the measuring means is not a prescribed threshold value or more, and makes the light output of the light source 2 lower than that at the time of the stationary lighting if it is the threshold value or more. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

The present invention relates to a light source lighting device, a lighting fixture , and a lighting system that are connected to a DC power source via a pair of DC supply lines and that turn on a light source by receiving power supply from the DC power source.

  Conventionally, in a luminaire to which DC power is supplied, it is connected to a DC power source (for example, an automobile battery) via a pair of DC supply lines so that a light source such as a light emitting diode (LED) is turned on. Various configured light source lighting devices are used.

This type of light source lighting device is generally a lighting means for lighting a light source so that the light output of the light source is maintained at a specified value even if a voltage Vin (hereinafter referred to as input voltage) Vin input from a DC supply line fluctuates. (When the light source is a light emitting diode, a constant current circuit for supplying a constant current to the light source) is provided (for example, see Patent Document 1). Therefore, the input power Vin = Vin × Iin (the circuit efficiency is constant) represented by the product of the input voltage Vin and a current (hereinafter referred to as input current) Iin input from the DC supply line is equal to the input voltage Vin. It remains constant regardless of fluctuations.
JP 2006-210836 A (page 3)

  By the way, when this type of light source lighting device is used, the voltage drop generated between the DC power source and the light source lighting device is large due to, for example, an increase in impedance of the DC supply line due to deterioration of the DC supply line. May be. When the voltage drop between the DC power source and the light source lighting device increases in this way, the input voltage Vin input from the DC supply line to the light source lighting device decreases even if the output voltage of the DC power source is constant.

  Here, as described above, since the light source lighting device includes lighting means (for example, a constant current circuit) that maintains the light output of the light source at a specified value, the input power Win is kept constant, and the DC supply line When the input voltage Vin from the input voltage decreases, the input current Iin increases due to the relationship of Iin = Win / Vin. At this time, the voltage drop caused by the impedance Z of the DC supply line increases as the current flowing in the DC supply line increases, and even if the output voltage Vo of the DC power supply is constant, Vin = Vo−Iin × Z. The input voltage Vin further decreases, and as a result, for example, the light source cannot be turned on, or all loads connected to the same DC supply line as the light source lighting device do not operate normally due to a decrease in the input voltage. May occur.

The present invention has been made in view of the above reasons, and prevents a further decrease in the input voltage when the input voltage from the DC supply line decreases due to an increase in the impedance of the DC supply line. It is an object of the present invention to provide a light source lighting device, a lighting fixture , and a lighting system that can turn on a light source.

  The invention of claim 1 is a light source lighting device that is connected to a DC power source via a pair of DC supply lines and that receives power supply from the DC power source to light the light source, and is a voltage input from the DC supply line Of the first operation state and the second operation state in which the magnitude of the light output of the light source is different from each other. By switching between the two operating states and dividing the difference between the input voltage in the first operating state and the input voltage in the second operating state by the difference between the input current in the second operating state and the input current in the first operating state Measuring means for measuring the impedance of the DC supply line, and determining whether the impedance of the DC supply line measured by the measuring means is equal to or higher than a predetermined threshold value. If the light output of the light source and the light output of the rated operation, and a controlling means to lower than that in the steady lighting of light output of the light source if above the threshold.

  According to this configuration, the control means lowers the light output of the light source compared to that during steady lighting when the impedance of the DC supply line measured by the measurement means is equal to or higher than a predetermined threshold value, so that the impedance of the DC supply line increases. If the voltage exceeds the threshold, the voltage drop that occurs between the DC power supply and the light source lighting device increases and the input voltage decreases, but the input voltage decreases by lowering the light output of the light source compared to that during steady lighting. Can suppress the increase in input current. In short, it is possible to suppress an increase in the current flowing through the DC supply line as the input voltage from the DC supply line decreases, and accordingly, between the DC power source and the light source lighting device as the current flowing through the DC supply line increases. It is possible to prevent the generated voltage drop from further increasing. That is, when the input voltage from the DC supply line to the light source lighting device decreases due to an increase in the impedance of the DC supply line, it is possible to prevent further reduction in the input voltage. Can not be lit, or other loads connected to the same DC supply line as the light source lighting device cannot be operated normally due to a decrease in input voltage.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the measurement means sets the state in which the light source is turned on and the state in which the light source is turned off as the first operation state and the second operation state, respectively. .

  According to this configuration, the measuring means measures the impedance of the DC supply line using the input voltage and input current when the light source is turned on and the input voltage and input current when the light source is turned off, so the impedance of the DC supply line is measured. The light output of the light source when the light source is turned on can be set to an arbitrary magnitude. In addition, since it is only necessary to blink the light source when measuring the impedance, it is easy to switch the light output of the light source, and the input current when the light source is turned off is zero, so the calculation process for obtaining the impedance is also simple become.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the magnitude of the current flowing through the light source is reflected in the magnitude of the optical output, and the control means includes the direct current supply. When the impedance of the line is equal to or higher than the threshold, the current flowing through the light source is lower than that during the steady lighting.

  According to this configuration, the control means reduces the current flowing through the light source to lower the light output of the light source compared to that during steady lighting, so that the magnitude of the current flowing through itself, such as a light emitting diode or organic EL, for example. The invention of claim 1 can be realized by using a light source that reflects the light intensity on the light output.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the amount of electric power supplied to the light source is reflected in the amount of light output. When the impedance of the DC supply line is equal to or higher than the threshold value, the power supplied to the light source is lower than that during the steady lighting.

  According to this configuration, the control means lowers the power supplied to the light source to lower the light output of the light source compared to that during steady lighting, so that it is supplied to itself, for example, like a high-intensity discharge lamp or a fluorescent lamp. The invention of claim 1 can be realized by using a light source that reflects the magnitude of power to be reflected in the magnitude of light output.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the measurement means includes the first operation state and the second operation within a predetermined measurement time from the time when the light source is turned on. The state is switched, and the impedance of the DC supply line is measured.

  According to this configuration, since the measurement unit switches between the first operation state and the second operation state within a predetermined measurement time from the time when the light source is turned on, at the time of steady lighting after the measurement time has elapsed from the time when the light source is turned on. Flickering of the light source can be avoided by switching between the first operation state and the second operation state.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the measurement unit repeatedly measures the impedance of the DC supply line, and the control unit determines the light output of the light source. When the impedance of the DC supply line measured by the measuring means is lower than the threshold value when compared with that during steady lighting, the light output of the light source is increased to the light output during steady lighting. .

  According to this configuration, even if the impedance of the DC supply line once exceeds the threshold value due to deterioration of the DC supply line, etc., if the impedance of the DC supply line falls below the threshold value due to replacement or repair of the DC supply line, etc. The light output of the light source can be restored to the light output during steady lighting.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the output voltage of the DC power supply is 50 V or less.

  According to this configuration, in a relatively narrow range where the input voltage from the DC supply line is 50 V or less, compared to the case where the input voltage exceeds 50 V, the influence of the decrease in the input voltage is greater, and the load may not operate normally. Therefore, when the input voltage from the DC supply line to the light source lighting device decreases, it is particularly useful to prevent further decrease in the input voltage.

  The invention according to claim 8 is characterized in that the fixture body is provided with the light source lighting device according to any one of claims 1 to 7.

According to this configuration, when the impedance of the DC supply line increases and exceeds the threshold value, the voltage drop generated between the DC power source and the light source lighting device increases and the input voltage decreases, but the light output of the light source is steady. By making it lower than at the time of lighting, it is possible to suppress an increase in the current flowing through the DC supply line as the input voltage decreases, and accordingly, as the current flowing through the DC supply line increases, the DC power source and the light source lighting device It is possible to prevent the voltage drop that occurs between them from further increasing. That is, when the input voltage from the DC supply line to the light source lighting device decreases due to an increase in the impedance of the DC supply line, it is possible to prevent further decrease in the input voltage.
A ninth aspect of the invention is characterized in that a plurality of lighting fixtures according to the eighth aspect are connected to the same DC supply line.
According to this configuration, when the impedance of the DC supply line increases and exceeds the threshold value, the voltage drop generated between the DC power source and the light source lighting device increases and the input voltage decreases, but the light output of the light source is steady. By making it lower than at the time of lighting, it is possible to suppress an increase in the current flowing through the DC supply line as the input voltage decreases, and accordingly, as the current flowing through the DC supply line increases, the DC power source and the light source lighting device It is possible to prevent the voltage drop that occurs between them from further increasing. That is, when the input voltage from the DC supply line to the light source lighting device decreases due to an increase in the impedance of the DC supply line, it is possible to prevent further decrease in the input voltage.

  The present invention has an effect that, when the input voltage from the DC supply line to the light source lighting device decreases with an increase in the impedance of the DC supply line, the light source can be turned on by preventing further decrease in the input voltage. .

  As shown in FIG. 2, the light source lighting device described in each of the following embodiments uses an AC power source AC such as a commercial power source as a DC power source by an AC / DC converter 112 disposed in a distribution board 110 such as a house. It is used in a DC distribution system that converts and distributes DC power from the distribution board 110 to a DC outlet such as a DC outlet 131 that is installed in each room and has a pair of positive and negative power feeding units.

  Here, the DC power distribution system will be briefly described below with reference to FIG.

  In the following description, a description will be given assuming a detached house as a building to which the DC power distribution system is applied, but this does not preclude the application of the technical concept of the DC power distribution system to an apartment house. As shown in FIG. 2, the house H is provided with a DC power supply unit 101 that outputs DC power and a DC device 102 as a load driven by the DC power, and an output end of the DC power supply unit 101. DC power is supplied to the DC device 102 through the DC supply line Wdc connected to the. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the DC device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the DC device 102 on the DC power supply line Wdc. A DC breaker 114 is provided for limiting or blocking the current.

  The DC supply line Wdc is used as both a DC power supply path and a communication path, and is connected to the DC supply line Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Enables communication between devices. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem constructed by the DC device 102 in the home network.

  In the example shown in the drawing, as an subsystem, an illumination system comprising an information equipment system K101 comprising an information-system DC device 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 102 such as a lighting fixture. K102, K105, an intercom system K103 including a DC device 102 for handling visitors and monitoring intruders, a residential alarm system K104 including a DC device 102 for an alarm system such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the intercom system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 for dividing the system of the DC supply line Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the intercom system K103.

  As the information equipment system K101, there is provided an information equipment system K101 composed of a DC equipment 102 connected to a DC outlet 131 arranged in advance in the house H (constructed when the house H is constructed) in the form of a wall outlet or a floor outlet.

  The lighting systems K102 and K105 include a lighting system K102 composed of a lighting device (DC device 102) arranged in advance in the house H and a lighting device (DC device 102) connected to a hook ceiling 132 arranged in advance on the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the householder himself attaches the lighting fixture.

  In addition to using an infrared remote control device, a control instruction for the lighting apparatus that is the DC device 102 constituting the lighting system K102 can be given using a communication signal from the switch 141 connected to the DC supply line Wdc. That is, the switch 141 has a communication function together with the DC device 102. In addition, a control instruction may be given by a communication signal from another DC device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  Since any DC device 102 can be connected to the DC outlet 131 and the hooking ceiling 132 described above and DC power is output to the connected DC device 102, the DC outlet 131 and the hooking ceiling 132 are distinguished below. When it is not necessary, it is called “DC outlet”.

  These DC outlets are provided with plug-in connection ports (power feeding portions) into which contacts (not shown) provided directly on the DC device 102 or contacts (not shown) provided via connecting wires are inserted. It has a structure in which a contact receiver that opens to the body and directly contacts the contact inserted into the connection port is held by the container. That is, the direct current outlet supplies power in a contact manner. When the DC device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. A communication function is provided not only in the DC device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (including mainly the DC equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information about equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of the devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  By the way, the DC power supply unit 101 basically generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 112 including a switching power source through a main circuit breaker 111 attached to the distribution board 110 as an internal unit. The DC power output from the AC / DC converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar battery 161, the secondary battery 162, and the fuel battery 163 are distributed power supplies with respect to the main power supply including the AC / DC converter 112 that generates DC power from the AC power supply AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The coordination control unit 113 performs charge / discharge of the secondary battery 162 and coordination between the main power source and the distributed power source. That is, the cooperative control unit 113 functions as a DC power control unit that controls the distribution of power from the main power source and the distributed power source constituting the DC power supply unit 101 to the DC device 102. Note that a configuration may be adopted in which the outputs of the solar cell 161, the secondary battery 162, and the fuel cell 163 are converted into AC power and used as input power of the AC / DC converter 112.

  Since the driving voltage of the DC device 102 is selected from a plurality of types of voltages depending on the device, a DC / DC converter is provided in the cooperative control unit 113 to convert the DC voltage obtained from the main power source and the distributed power source into a necessary voltage. Is desirable. Normally, one type of voltage is supplied to one subsystem (or DC device 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is possible to adopt a configuration in which the DC supply line Wdc is of a two-wire type and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  In the above configuration example, only one AC / DC converter 112 is illustrated, but a plurality of AC / DC converters 112 can be arranged in parallel, and when a plurality of AC / DC converters 112 are provided. It is desirable to increase or decrease the number of AC / DC converters 112 that are operated according to the magnitude of the load.

  The AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, the solar cell 161, the secondary battery 162, and the fuel cell 163 described above are provided with a communication function, and include a main power source, a distributed power source, and a DC device 102. It is possible to perform cooperative operations that deal with the load status. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the DC device 2.

  In the above example, the AC / DC converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 112. On the output side, a branch breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided on the AC supply line of each system to convert it into DC power for each system. You may employ | adopt the structure to do.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the DC device 102 that uses DC power and Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. Also, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, and the home server 116 are housed in a separate board from the distribution board 110. Also good.

  Below, the example which applied this invention to the light source lighting device with which the lighting fixture (DC apparatus 102) which comprises the lighting system K102 in the DC distribution system mentioned above is demonstrated is demonstrated, but this invention is other than this kind of lighting fixture. The present invention can also be applied to a light source lighting device provided in the apparatus. Here, the magnitude of the DC voltage applied to the DC device 102 from the DC outlet is set to be lower (for example, 24V, 50V, etc.) than the AC commercial power supply.

(Embodiment 1)
The light source lighting device 1 of this embodiment is connected to a DC power supply E (DC power supply unit 101) via a pair of DC supply lines Wdc as shown in FIG. In response, the light source 2 is turned on. Here, a light emitting diode (LED) that reflects the magnitude of the current Ila flowing through the light source 2 in the magnitude of the light output is employed as the light source 2.

  A specific configuration of the light source lighting device 1 will be described with reference to FIG. The light source lighting device 1 includes a current control circuit 3 that controls a current flowing through the light source 2 between a pair of DC input terminals T1 and T2 connected to a DC power source E via a DC supply line Wdc, and a DC supply line Wdc. A voltage detector (voltage detector) 4 that detects a voltage applied between the DC input terminals T1 and T2 as an input voltage Vin, and a current that detects a current flowing from the DC supply line Wdc to the current control circuit 3 as an input current Iin. And a detection unit (current detection means) 10.

  The current control circuit 3 includes a series circuit of a switching element Q1, an inductor L1, and a capacitor C1 connected between the DC input terminals T1 and T2 via the current detection unit 10, and a connection point side of the switching element Q1 and the inductor L1. A step-down converter including a diode D1 connected between both ends of a series circuit of an inductor L1 and a capacitor C1 so as to connect a cathode to the drive circuit 5 and a drive circuit 5 for turning on and off the switching element Q1 in accordance with a drive signal from a control unit 6 described later. It has a chopper circuit. Furthermore, one end of the capacitor C1 is connected to one of a pair of output ends T3 and T4 connected to the light source 2, and the other end of the capacitor C1 is connected to the other end of the output ends T3 and T4 via a resistor R3. The As a result, a current corresponding to the voltage generated at both ends of the capacitor C1 flows through the series circuit of the light source 2 and the resistor R3. In addition, an output voltage detection unit formed by connecting a pair of resistors R4 and R5 in series is provided between both ends of the capacitor C1. A MOSFET is used as the switching element Q1.

  Here, the magnitude of the voltage generated across the capacitor C <b> 1 is controlled by the switching element Q <b> 1 being on / off controlled by the drive signal output from the control unit 6 to the drive circuit 5. The controller 6 monitors the magnitude of the lamp voltage Vla generated across the capacitor C1 based on the voltage across the resistor R5, and further monitors the lamp current Ila flowing through the light source 2 based on the voltage across the resistor R3. The lamp voltage Vla is used to detect an abnormal operation or the like of the current control circuit 3, and the control unit 6 turns off the switching element Q1 and stops the output of the current control circuit 3 when the current control circuit 3 operates abnormally.

  The voltage detection unit 4 includes a series circuit of resistors R1 and R2 connected between a pair of DC input terminals T1 and T2, and the control unit 6 determines a DC voltage based on the voltage across the resistor R2 constituting the voltage detection unit 4. The input voltage Vin input to the light source lighting device 1 from the supply line Wdc is monitored.

  The current detection unit 10 includes a resistor R0 connected between one DC input terminal T2 and the anode of the diode D1 of the current control circuit 3, and the control unit 6 determines the DC supply line based on the voltage across the resistor R0. The input current Iin input to the light source lighting device 1 from Wdc is monitored. Here, when the power supplied from the DC supply line Wdc to the light source lighting device 1 is the input power Win, the input power Win is represented by the product of the input voltage Vin and the input current Iin (Win = Vin × Iin).

  By the way, in the light source lighting device 1 of the present embodiment, the control unit 6 functions as a measurement unit that measures the impedance Z (see FIG. 5B) of the DC supply line Wdc and the measured DC supply line Wdc. It has a function as a control means for controlling the magnitude of the light output φ (see FIG. 4A) of the light source 2 based on the magnitude of the impedance Z.

  Below, the structure and function of the control part 6 as a measurement means are demonstrated first.

The control unit 6 of the present embodiment is configured to be able to switch between two operation states of a first operation state and a second operation state in which the magnitude of the light output φ of the light source 2 is different from each other, and the input in the first operation state voltage Vin (hereinafter referred to as _{V 1)} and the input voltage Vin in the second operation state (hereinafter referred to as _{V 2)} and the difference _(i.e., V 1 -V ₂₎ the input current in the second operating state Iin ( hereinafter referred to as _{I 2)} and the input current Iin (hereinafter in the first operation state, measuring the impedance Z of the DC supply line Wdc by dividing the difference _(I 2 -I ₁₎ of the _{I 1).}

More specifically, the control unit 6 controls the light source 2 as shown in FIG. 4A by on / off control of the switching element Q1 during a period of measuring the impedance Z of the DC supply line Wdc (hereinafter referred to as a measurement period). after operating the current control circuit 3 in the first operating state of lighting at a lower light output phi ₁ than the light output phi ₂ of the rated operation (time T ₀ through T 1 in FIG. _4), when the light source 2 steady lighting The current control circuit 3 is operated in the second operation state (time T _{1 to} T _{2 in} FIG. 4) that is lit at the light output φ ₂ of FIG. The period from time T ₀ in FIG. 4 (a) ~ (c), by stopping the output of the current control circuit 3 turns off the switching element Q1, and the light source 2 extinguished state.

Here, in the present embodiment, the light source 2 is turned on after a predetermined measurement time elapses from the time when the light source 2 is turned on after the power supply from the light source lighting device 1 is started (time T _{0 in} FIG. 4). The period until time is stabilized (time T _{0 to} T _{2 in} FIG. 4) is the measurement period, and the ratio occupied by the first operation state and the ratio occupied by the second operation state in the measurement period are equal to each other. The two operating states are switched. As described above, by setting the measurement period immediately after the light source 2 is turned on, the light source 2 is switched between the first operation state and the second operation state during the steady lighting after the measurement time has elapsed since the light source 2 was turned on. There is an advantage that flickering in 2 can be avoided.

Comparing the first operation state and the second operation state, the output of the light source lighting device 1 (that is, the light output φ of the light source 2) is higher in the second operation state than in the first operation state. The input power Win of 1 is higher in the second operation state than in the first operation state. At this time, since the output voltage Vo of the DC power source E is constant, the input current Iin increases as the input power Win of the light source lighting device 1 increases. Therefore, in the first operating state as shown in FIG. input current I ₂ increases in the second operating state than the input current I ₁ of the. Further, when the input current Iin increases, the voltage drop caused by the impedance Z of the DC supply line Wdc increases as the current flowing through the DC supply line Wdc increases, and the input voltage Vin decreases. Thus, the input voltage V ₂ in the second operation state is lower than the input voltage V ₁ in the first operation state.

Here, the relationship of Vin = Vo−Iin × Z is established among the output voltage Vo of the DC power supply E, the impedance Z of the DC supply line Wdc, the input voltage Vin, and the input current Iin. the input voltage V ₁ of the represented by _{V 1 = Vo-I 1 ×} Z with the input current I ₁ in the first operating state, the input voltage V ₂ at the second operating condition input in the second operating state Using the current I ₂ , V ₂ = Vo−I ₂ × Z. Therefore, the control unit 6 can obtain the impedance Z of the DC supply line Wdc by calculating (V ₁ −V ₂ ) / (I ₂ −I ₁ ).

Further, in the present embodiment, the control unit 6, by providing repeated measurement period for switching from the first operating state to the second operating state (time T _{10 through T} 12 in FIG. ₅₎ as shown in FIG. 5 (a) As shown in FIG. 5B, the measurement of the impedance Z of the DC supply line Wdc is repeatedly performed at intervals. The interval of the measurement period may be a fixed time or may be set at random.

  Next, the configuration and function of the control unit 6 as control means will be described.

The control unit 6 of the present embodiment sets the impedance Z of the DC supply line Wdc obtained as described above at a predetermined threshold value Zth at the time when the measurement period has elapsed (time T ₂ and T _{12 in} FIGS. 4 and 5). And whether or not the impedance Z is equal to or greater than the threshold value Zth is determined.

As shown in FIG. 5, if the impedance Z is not equal to or greater than the threshold value Zth (that is, if Z <Zth), the control unit 6 determines that the light output φ of the light source 2 is the light output φ ₂ during steady lighting. made way, to control the output of the current control circuit 3 by on-off control of the switching element Q1 (time T ₁₂ later in FIG. 5). On the other hand, if the impedance Z is the threshold value Zth above (that is, if Z ≧ Zth), the control unit 6 so that the optical output phi ₃ light output phi is less than the time of steady lighting of the light source 2, the switching element controlling the output of the current control circuit 3 by on-off control of Q1 (time _T 2 _{through T} 10 in FIG. 5). Here, the light output φ ₃ lower than that in steady lighting is set lower than the light output φ ₁ of the light source 2 in the first operation state.

More specifically, when the measured impedance Z of the DC supply line Wdc is less than the threshold value Zth, the control unit 6 determines that the lamp current Ila flowing through the light source 2 is maintained at a predetermined value (for example, a rated lamp current). On / off control of the switching element Q1 of the current control circuit 3 is performed so as to obtain a current. Here, since the light source 2 is a light emitting diode that reflects the magnitude of the current flowing through the light source 2 in the magnitude of the light output φ, the light output φ of the light source 2 is controlled by controlling the light source 2 to flow a constant current. It is maintained constant (light output φ ₂ during steady lighting). On the other hand, when the measured impedance Z of the DC supply line Wdc is equal to or greater than the threshold value Zth, the control unit 6 turns on and off the switching element Q1 of the current control circuit 3 so that the lamp current Ila flowing through the light source 2 becomes smaller than the predetermined value. Control. By reducing the current flowing through the light source 2 in this manner, the light output φ of the light source 2 becomes a light output φ ₃ lower than the light output φ ₂ during steady lighting.

  Here, a method of reducing the magnitude (absolute value) of the lamp current Ila by PWM control that changes the on-duty of the switching element Q1 is adopted to reduce the lamp current Ila flowing through the light source 2. The lamp current Ila may be decreased by periodically outputting the current Ila and adjusting the length of time for which the lamp current Ila is allowed to flow per unit time.

According to the configuration described above, when the impedance Z of the DC supply line Wdc is less than the threshold value Zth, the light output φ ₂ at the time of steady lighting of the light source 2 is caused by flowing a constant current to the light source 2 regardless of the fluctuation of the input voltage Vin. Can be turned on. On the other hand, for example, when the impedance Z of the DC supply line Wdc increases to a threshold value Zth or more due to deterioration of the DC supply line Wdc, a voltage drop generated between the DC power source E and the light source lighting device 1 becomes large, and the input voltage Vin is reduced. Although it decreases, the increase of the input current Iin from the DC supply line Wdc accompanying the decrease of the input voltage Vin is suppressed by suppressing the light output φ of the light source 2 to the light output φ ₃ that is lower than the light output φ ₂ during steady lighting. can do.

  That is, when the impedance Z of the DC supply line Wdc increases, the input power Win (= Vin × Iin) of the light source lighting device 1 is reduced by reducing the output of the light source lighting device 1 (here, the lamp current Ila flowing through the light source 2). Therefore, it is possible to prevent the input current Iin from increasing as the input voltage Vin decreases, as in the case where the input power Win is kept constant. As a result, it is possible to suppress an increase in the current flowing through the DC supply line Wdc with a decrease in the input voltage Vin, and it occurs between the DC power source E and the light source lighting device 1 with an increase in the current flowing through the DC supply line Wdc. Since the voltage drop can be prevented from further increasing, when the input voltage Vin to the light source lighting device 1 decreases due to the increase in the impedance Z of the DC supply line Wdc, the input voltage Vin is further decreased. Can be prevented. Therefore, for example, the light source 2 cannot be turned on, or another load connected to the same DC supply line Wdc as the light source lighting device 1 does not operate normally due to a decrease in the voltage input from the DC supply line Wdc. It is possible to avoid problems such as.

Moreover, in the present embodiment, the impedance Z of the DC supply line Wdc is determined by using the input voltage V ₁ and the input current I ₁ in the first operation state, and the input voltage V ₂ and the input current I ₂ in the second operation state. Since it is measured by the control unit 6, the impedance Z of the DC supply line Wdc can be measured only on the light source lighting device 1 side of the DC supply line Wdc, and means for measuring the impedance Z of the DC supply line Wdc is a light source lighting device. 1 and there is an advantage that the measurement can be performed while the power supply from the DC power source E to the light source lighting device 1 is continued through the DC supply line Wdc.

  When the impedance Z of the DC supply line Wdc becomes equal to or greater than the threshold value Zth, the light output φ of the light source 2 is reduced, so that the user is abnormal (the impedance Z of the DC supply line Wdc is increasing). There is also an advantage that it can be notified by a decrease in the optical output φ.

In the present embodiment, as described above, the control unit 6 repeatedly measures the impedance Z of the DC supply line Wdc. If the measured impedance Z of the DC supply line Wdc falls below the threshold value when the light output φ of the light source 2 is kept lower than that during steady lighting, the control unit 6 sets the light output φ of the light source 2 during steady lighting. and it controls the current control circuit 3 so as to increase to the light output phi _2. Thereby, for example, due to deterioration of the DC supply line Wdc, the impedance Z of the DC supply line Wdc once becomes equal to or greater than the threshold value Zth, and it is determined that the impedance Z is equal to or greater than the threshold value Zth in the first measurement period. Even if φ is suppressed to the optical output φ ₃ , if the impedance Z of the DC supply line Wdc falls below the threshold Zth due to replacement or repair of the DC supply line Wdc, the next measurement is that the impedance Z is below the threshold Zth. It is recognized by the control unit 6 during the period, and the light output φ of the light source 2 can be automatically restored to the light output φ ₂ during steady lighting.

Further, in the present embodiment, the light output phi light source 2, an optical output phi ₂ in the second operation state is set to the light output phi ₂ and equivalence of steady lighting, constant light output phi ₁ in the first operating state set lower than the light output phi ₂ at the time of lighting is set even lower than the light output phi ₁ and in the first operating state the light output phi ₃ when the impedance Z of the DC supply line Wdc is equal to or larger than the threshold Zth (That is, φ ₃ <φ ₁ <φ ₂ ), but the relationship of each light output φ is not limited to this example. For example, to set the optical output to optical output phi ₂ different values of rated operation in the second operation state, or the light output in the first operation state or set higher than the light output in the second operation state Also good. Further, the light output φ in the first operation state or the second operation state is set to zero (that is, the light output φ _{0 when the} light source 2 is turned off), and the control unit 6 turns on and off the light source 2 during the measurement period. May be switched between the first operation state and the second operation state.

  In the above embodiment, a light emitting diode is used as the light source 2. However, the light source 2 is not limited to the light emitting diode, and the light source 2 that reflects the magnitude of the current flowing through the light source is used. In such a case, a circuit similar to the above embodiment can be employed.

(Embodiment 2)
The light source lighting device 1 of the present embodiment employs, as the light source 2, a high-intensity discharge lamp (HID lamp) that reflects the magnitude of power supplied to itself in the magnitude of light output. This is different from the light source lighting device 1 of FIG.

  A specific configuration of the light source lighting device 1 of the present embodiment will be described with reference to FIG. The light source lighting device 1 includes a voltage detection unit 4, a resistor R 0 as a current detection unit 10, and a power control circuit 7 that controls the amount of power supplied to the light source 2 between the DC input terminals T 1 and T 2. And a power conversion circuit 8 that converts the DC power output from the power control circuit 7 into AC power, and a resonance circuit 9 that is inserted between the power conversion circuit 8 and the pair of output terminals T3 and T4. doing.

  The power control circuit 7 is a step-down chopper circuit similar to the current control circuit 3 of the first embodiment, and one end of the capacitor C1 is connected to one input end of the power conversion circuit 8, and the other end of the capacitor C1 is connected to the resistor R3. To the other input terminal of the power conversion circuit 8.

  The power conversion circuit 8 is configured by a full bridge circuit of switching elements Q2 to Q5 connected between both ends of the capacitor C1 of the power control circuit 7. That is, between the both ends of the capacitor C1, the series circuit of the switching elements Q2 and Q4 and the series circuit of the switching elements Q3 and Q5 are connected in parallel, and the switching elements Q2 and Q5 are turned on and the switching elements Q3 and Q4 are turned on. Are alternately switched between a period in which switching elements Q3 and Q4 are on and a period in which switching elements Q2 and Q5 are off, thereby connecting the connection point between switching elements Q2 and Q4 and the connection point between switching elements Q3 and Q5. AC power is generated between them. Here, each of the switching elements Q2 to Q5 is composed of a MOSFET, and is on / off controlled by the control unit 6.

  A connection point between the switching element Q2 and the switching element Q4 is connected to one output terminal T3 via the inductor L2, and a connection point between the switching element Q3 and the switching element Q5 is connected to the other output terminal T4. The resonance circuit 9 includes the inductor L2 and a capacitor C2 inserted between the output terminals T3 and T4.

  The controller 6 monitors the magnitude of the lamp voltage Vla generated across the capacitor C1 based on the voltage across the resistor R5, and further monitors the lamp current Ila flowing through the light source 2 based on the voltage across the resistor R3. Here, if the power supplied to the light source 2 is the lamp power Wla, the lamp power Wla is represented by the product of the lamp voltage Vla and the lamp current Ila (Wla = Vla × Ila). The lamp voltage Vla is used for detecting abnormal operation of the power control circuit 7, lamp out, and the like. The control unit 6 turns off the switching element Q1 when the power control circuit 7 operates abnormally or when the lamp is out of power. 7 output is stopped.

By the way, in the light source lighting device 1 of the present embodiment, when the impedance Z of the DC supply line Wdc measured by the control unit 6 is less than the threshold value Zth, the control unit 6 determines that the lamp power Wla supplied to the light source 2 is a predetermined value. The switching element Q1 of the power control circuit 7 is on / off controlled so that the constant power is maintained at (for example, rated lamp power). Here, since the light source 2 is a high-intensity discharge lamp that reflects the magnitude of power supplied to itself in the magnitude of the light output φ, the light source 2 can be controlled by supplying constant power to the light source 2. Is maintained constant (light output φ ₂ during steady lighting). On the other hand, when the measured impedance Z of the DC supply line Wdc is equal to or greater than the threshold value Zth, the control unit 6 sets the switching element Q1 of the power control circuit 7 so that the lamp power Wla supplied to the light source 2 is smaller than the predetermined value. ON / OFF control. By reducing the power supplied to the light source 2 in this way, the light output φ of the light source 2 becomes a light output φ ₃ lower than the light output φ ₂ during steady lighting.

  In the above-described embodiment, an example in which a high-intensity discharge lamp is used as the light source 2 has been described. However, the present invention is not limited to a high-intensity discharge lamp, and the magnitude of electric power supplied to itself, such as a fluorescent lamp, When the reflected light source 2 is used, a circuit similar to that in the above embodiment can be employed.

  Other configurations and functions are the same as those of the first embodiment.

  By the way, by providing the light source lighting device 1 in each of the above-described embodiments in a fixture main body (not shown) of a lighting fixture (DC device 102), for example, indoor lighting that is attached to a ceiling or a wall or the like to illuminate the interior, The light source lighting device 1 of the present invention can be used in various lighting fixtures such as a foot lamp that is attached to the lower part of the floor and irradiates a part of the floor surface with light.

It is a schematic block diagram of Embodiment 1 of this invention. It is a system configuration diagram showing a DC power distribution system in which the light source lighting device is used. It is a schematic circuit diagram which shows a structure same as the above. The operation is the same as above, (a) is a time chart of optical output, (b) is a time chart of input current, and (c) is a time chart of input voltage. The operation | movement is shown above, (a) is a time chart of an optical output, (b) is a time chart of the measured impedance. It is a schematic circuit diagram which shows the structure of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source lighting device 2 Light source 4 Voltage detection part (voltage detection means)
6 Control unit (measuring means, control means)
10 Current detector (current detection means)
102 DC equipment (lighting equipment)
E DC power supply Iin Input current I ₁ Input current in the first operation state I ₂ Input current in the second operation state Ila Lamp current Vin Input voltage V ₁ Input voltage in the first operation state V ₂ Input voltage in the second operation state Wdc DC Supply line Wla Lamp power Z Impedance Zth threshold φ Light output φ ₂ Light output during steady lighting

Claims (9)

A light source lighting device that is connected to a DC power source via a pair of DC supply lines and that turns on the light source by receiving power supply from the DC power source,
Voltage detection means for detecting a voltage input from a DC supply line as an input voltage;
Current detection means for detecting current input from a DC supply line as input current;
Switching between two operating states, a first operating state and a second operating state, in which the light output levels of the light sources are different from each other, the difference between the input voltage in the first operating state and the input voltage in the second operating state is determined as the second operating state. Measuring means for measuring the impedance of the DC supply line by dividing by the difference between the input current in the state and the input current in the first operating state;
It is determined whether the impedance of the DC supply line measured by the measuring means is equal to or higher than a predetermined threshold value. If it is not higher than the threshold value, the light output of the light source is set as the light output during steady lighting. A light source lighting device comprising: control means for lowering the light intensity compared to during steady lighting.   2. The light source lighting device according to claim 1, wherein the measurement unit sets a state in which the light source is turned on and a state in which the light source is turned off as the first operation state and the second operation state, respectively.   The light source reflects the magnitude of the current flowing through the light source in the magnitude of the optical output, and the control means supplies the current flowing through the light source when the impedance of the DC supply line is equal to or greater than the threshold value. The light source lighting device according to claim 1, wherein the light source lighting device is lower than that during lighting.   The light source reflects the magnitude of power supplied to itself in the magnitude of light output, and the control means supplies power to the light source when the impedance of the DC supply line is equal to or greater than the threshold value. The light source lighting device according to claim 1, wherein the light source lighting device is made lower than that during the steady lighting.   The measurement means switches the first operation state and the second operation state within a predetermined measurement time from the time when the light source is turned on, and measures the impedance of the DC supply line. The light source lighting device according to any one of claims 1 to 4.   The measurement means repeatedly measures the impedance of the DC supply line, and the control means measures the DC supply line measured by the measurement means when the light output of the light source is lower than that during the steady lighting. 6. The light source lighting device according to claim 1, wherein when the impedance of the light source falls below the threshold, the light output of the light source is increased to the light output at the time of steady lighting.   The light source lighting device according to any one of claims 1 to 6, wherein an output voltage of the DC power supply is 50 V or less.   A lighting fixture comprising the light source lighting device according to any one of claims 1 to 7 in a fixture main body.   A plurality of lighting fixtures according to claim 8 are connected to the same DC supply line.

Images