JP2010277731A - Lighting device as well as lighting fixture and illuminating system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lighting device simplifying a circuit for calculating input power and realizing cost reduction as well as a lighting fixture, and also to provide an illuminating system using the same. <P>SOLUTION: The lighting device A is provided with: a conversion circuit 1 equipped with a switching element Q1 for converting a commercial alternating-current power source AC into a direct-current power source of a desired voltage value; a detection circuit 32 for detecting a voltage proportionate to a current flowing in the switching element Q1; a lighting circuit 2 for lighting a lamp LA with a direct-current output of the conversion circuit 1; a driving circuit 30 for driving and controlling the switching element Q1 in accordance with the voltage value of the above direct-current output; and a calculation circuit 33 for outputting an electric signal Win proportionate to input power, based on the voltage value detected by the detection circuit 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device, and a lighting fixture and a lighting system using the lighting device.

  Conventionally, a lighting device for lighting a discharge lamp (for example, a fluorescent lamp) has been provided (see, for example, Patent Document 1). This lighting device includes a rectifier circuit that generates a DC voltage by full-wave rectifying a commercial AC power supply, a boost chopper circuit that boosts the DC output of the rectifier circuit to a DC output of a desired voltage value, and a chopper circuit. An input filter circuit for blocking the generated high frequency and an inverter circuit are provided. The discharge lamp is turned on by applying a high frequency alternating voltage generated by the inverter circuit to the discharge lamp.

Japanese Patent Laying-Open No. 2006-13169 (paragraph [0002] and FIG. 9)

  By the way, in the conventional lighting device described above, it is common to detect the input voltage and the input current when calculating the input power to the lighting device, and therefore, a voltage detection circuit and a current detection circuit are required respectively. In addition, an arithmetic circuit for calculating the input power from the detection results of both detection circuits is necessary, and in particular, an expensive current transformer is required to detect the input current. In addition, since the above three circuits are necessary to calculate the input power, the apparatus becomes large.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to use a small lighting device that achieves cost reduction while simplifying a circuit for calculating input power and the same. It is in providing a lighting fixture and a lighting system.

  The invention according to claim 1 includes a conversion circuit that includes a switching element and converts an input power supply to a DC power supply having a desired voltage value, a detection circuit that detects a voltage proportional to a current flowing through the switching element, and a DC output of the conversion circuit Receiving a lighting circuit for lighting the lamp, a first driving circuit for driving and controlling the switching element according to the voltage value of the DC output, and an electric signal proportional to the input power is output based on the voltage detected by the detecting circuit And an arithmetic circuit for performing the processing.

  The invention according to claim 2 is characterized in that the conversion circuit comprises either an AC-DC conversion circuit whose input power is an AC power supply or a DC-DC conversion circuit whose input power is a DC power supply.

  The invention of claim 3 is characterized in that the arithmetic circuit calculates the input power by multiplying the voltage detected by the detection circuit by a predetermined coefficient.

  The invention according to claim 4 is characterized in that the arithmetic circuit changes the coefficient in accordance with the voltage detected by the detection circuit.

  The invention according to claim 5 has a dimming function for controlling the output of the conversion circuit or the lighting circuit in accordance with the dimming signal input to the arithmetic circuit, and the arithmetic circuit has a voltage and dimming detected by the detection circuit. The coefficient is changed according to the signal.

  The invention according to claim 6 is characterized in that the arithmetic circuit changes the coefficient according to the magnitude relationship between the voltage detected by the detection circuit and the reference value determined by the dimming signal.

  In the invention according to claim 7, the arithmetic circuit is preset with the same number of coefficients as the number of input power supplies selectively connected to the conversion circuit, and selects from among the coefficients according to the input power supplies connected. Features.

  According to an eighth aspect of the present invention, the arithmetic circuit includes: a first drive circuit; a second drive circuit that controls driving of the switching elements that constitute the lighting circuit; and an external device connected to the arithmetic circuit via a communication line An electrical signal is output to at least one of them.

  According to the ninth aspect of the present invention, an electrical signal is input to at least one of the first and second drive circuits, and the drive circuit is configured so that the input power indicated by the electrical signal matches a preset reference value. The driving of the corresponding switching element is characterized.

  The invention of claim 10 is characterized in that the reference value is input from an external device via a communication line.

  According to an eleventh aspect of the present invention, when an electric signal is input to at least one of the first and second drive circuits, and the input power indicated by the electric signal exceeds a preset range, the drive circuit Alternatively, the driving of the corresponding switching element is controlled so that the output of the lighting circuit is lowered or stopped.

  A twelfth aspect of the present invention includes the lighting device according to any one of the first to eleventh aspects.

  The invention of claim 13 is characterized in that a plurality of lighting fixtures according to claim 12 are connected to a control device via a communication line, and each lighting fixture is individually controlled by the control device. .

  According to the first aspect of the invention, since the output voltage of the conversion circuit is controlled to be constant by feedback control by the first drive circuit, the output power of the conversion circuit is determined from this output voltage and the input current to the conversion circuit. The input power can be obtained by calculating back from this output power. Therefore, since only the input current needs to be detected in order to obtain the input power, the circuit for obtaining the input power can be simplified as compared with the conventional example. In addition, since the voltage proportional to the input current is detected when detecting the input current, the cost can be reduced and the device can be downsized compared to the case where the input current is detected using a current transformer. There is an effect of becoming.

  According to the invention of claim 2, the same effect as that of claim 1 can be obtained.

  According to the third aspect of the present invention, it is only necessary to multiply the voltage detected by the detection circuit by a predetermined coefficient when calculating the input power, so that there is an effect that the arithmetic circuit can be further simplified.

  According to the invention of claim 4, the coefficient is changed according to the voltage detected by the detection circuit, and even when the input voltage is switched and the detection voltage is changed, the coefficient is changed. Since the input power can be calculated, there is an effect that it is possible to provide a lighting device that can handle a wide range of input power sources.

  According to the invention of claim 5, since the coefficient is changed according to the dimming signal, there is an effect that the input power according to the dimming level can be calculated even when the dimming level is changed. .

  According to the invention of claim 6, since the coefficient is set according to the magnitude relationship between the voltage detected by the detection circuit and the reference value determined by the dimming signal, the lighting device having a simpler arithmetic circuit There is an effect that can be realized.

  According to the invention of claim 7, by setting the same number of coefficients as the input power sources that may be connected, the input power corresponding to the input power source is calculated even when the input power source is changed. Therefore, there is an effect that it is possible to realize a lighting device that can support a wide range of input power sources.

  According to invention of Claim 8, when an electric signal is output with respect to a communication line, there exists an effect that it becomes possible to confirm the input power to a lighting device in the remote place away from the said lighting device. .

  According to the ninth aspect of the invention, it is possible to control the input power to the same level as the reference value by inputting an electric signal corresponding to the input power to the first or second drive circuit and performing feedback control. In addition, when the reference value can be changed, there is an effect that it can be controlled to an arbitrary input power.

  According to the invention of claim 10, when an illuminance sensor is used as an external device, the brightness of the illumination space is kept constant by adjusting the reference value so that the illuminance detected by the illuminance sensor becomes a predetermined illuminance. There is an effect that can be kept.

  According to the invention of claim 11, when the input power exceeds a predetermined range, it is determined that there is an abnormality, and the output of the conversion circuit or the lighting circuit is reduced or stopped, so that it is known that an abnormality has occurred. In addition, the apparatus can be operated in a safe direction to protect the apparatus and the lighting load connected to the apparatus.

  According to the invention of claim 12, by using the lighting device according to any one of claims 1 to 11, it is possible to provide a lighting fixture capable of detecting input power while suppressing an increase in cost. There is.

  According to the invention of claim 13, there is an effect that the input power to the lighting device of each lighting fixture can be collectively confirmed by the control device.

(A) is a circuit diagram of the lighting device of Embodiment 1, (b) is a circuit diagram of a detection circuit and an arithmetic circuit same as the above. It is a circuit diagram which shows another example same as the above. 6 is a circuit diagram of a detection circuit and an arithmetic circuit of the lighting device of Embodiment 2. FIG. It is a graph which shows the relationship between the detection voltage of the lighting device of Embodiment 1, 2 and input electric power. (A) is a circuit diagram of the lighting device of Embodiment 3, (b) is a circuit diagram of a detection circuit and an arithmetic circuit same as the above. It is a graph which shows the relationship between a detection voltage same as the above and input electric power. FIG. 6 is a circuit diagram of a detection circuit, an arithmetic circuit, and an abnormality detection circuit of a lighting device according to a fourth embodiment. It is a graph which shows the relationship between the light control level same as the above, and input electric power. FIG. 10 is a circuit diagram of a lighting device according to a fifth embodiment. (A) (b) is a circuit diagram which shows another example same as the above. It is a perspective view which shows an example of the lighting fixture which concerns on this invention. 1 is a schematic system diagram showing an example of an illumination system according to the present invention.

  Hereinafter, embodiments of a lighting device, a lighting fixture, and a lighting system according to the present invention will be described with reference to the drawings. The lighting device according to the present invention is used to light a light source such as a discharge lamp or a light emitting diode, and the lighting fixture and lighting system according to the present invention uses the lighting device.

(Embodiment 1)
FIG. 1A is a circuit diagram of the lighting device A according to the first embodiment. The lighting device A converts the commercial AC power source AC into a DC power source having a desired voltage value, and the DC of the conversion circuit 1. A lighting circuit 2 that turns on a lamp (for example, a fluorescent lamp) LA in response to an output, and a control circuit 3 that individually controls the conversion circuit 1 and the lighting circuit 2 are provided.

  The conversion circuit 1 is a so-called AC-DC conversion circuit that converts a power supply voltage from alternating current to direct current, a low-pass filter LPF that passes only a low frequency of the commercial alternating-current power supply AC, and a diode that rectifies the alternating current output of the low-pass filter LPF. A series circuit of an inductor L2, a switching element Q1, and a resistor Rd is connected between the output ends of the diode bridge DB. The connection point between the inductor L2 and the switching element Q1 is connected to one input end of the lighting circuit 2 (plus side of the electrolytic capacitor C1) via the diode D1, and further the other input end of the lighting circuit 2 (electrolytic capacitor). The output end (minus side) of the diode bridge DB is connected to the minus side (C1), which constitutes a so-called boost type chopper circuit.

  The lighting circuit 2 is a so-called half-bridge type inverter circuit using two switching elements Q2 and Q3, and a series circuit of the switching elements Q2 and Q3 is connected to both ends of the electrolytic capacitor C1 connected between the input ends. Has been. A series circuit of an inductor L1 and a capacitor C2 is connected between both ends of the switching element Q3, and a lamp LA is connected between both ends of the capacitor C2 via the capacitor C3.

  The control circuit 3 includes a drive circuit (first drive circuit) 30 that controls the DC output to a predetermined voltage value by changing the on-duty of the switching element Q1 in accordance with the DC output of the conversion circuit 1, and is alternately turned on / off. A drive circuit (second drive circuit) 31 that controls the switching elements Q2 and Q3 to be turned off, a detection circuit 32 that detects a voltage proportional to the current flowing through the switching element Q1, and a detection circuit 32 And an arithmetic circuit 33 that outputs an electric signal Win proportional to input power based on a voltage (hereinafter referred to as a detection voltage). In the present embodiment, the detection voltage is configured to detect a voltage on one end side (switching element Q1 side) of the resistor Rd.

  In this embodiment, an external device (not shown) (for example, a control device C described later) and the arithmetic circuit 33 are connected via the communication line Ls, and the electric signal Win is externally connected via the communication line Ls. It is transmitted to the equipment. The drive circuits 30 and 31 are well known in the art and will not be described in detail.

  Here, as the simplest method for calculating the input power, a case will be described in which feedback control is performed by the drive circuit 30 so that the voltage across the electrolytic capacitor C1 (the output voltage of the conversion circuit 1) is constant. In addition, in the following description, the case where the power supply voltage of the lighting device A is one type (for example, AC 100V) will be described. When the voltage across the electrolytic capacitor C1 (the output voltage of the conversion circuit 1) is constant and the loss in the conversion circuit 1 is ignored, the input power Win is Win = Vin × Iin × PF = α × Iin≈α × IQ1 (however, PF (power factor) = 1) and the input power Win is proportional to the voltage IQ1. In the expression, Vin is a power supply voltage, Iin is an input current, α is a positive coefficient, and IQ1 is a detection voltage of the detection circuit 32.

  Here, the coefficient α is determined based on the set value of the output voltage of the conversion circuit 1, and in this embodiment, the voltage across the electrolytic capacitor C1 (the output voltage of the conversion circuit 1) and the input current are determined. The output power of the conversion circuit 1 is calculated from Iin, and the input power is calculated by calculating back from the output power of the conversion circuit 1. In the above description, since the loss of the conversion circuit 1 is ignored, the coefficient α is determined only by the voltage across the electrolytic capacitor C1, but the coefficient including the conversion efficiency of the conversion circuit 1 is used. If α is determined, more accurate input power can be calculated.

  Thus, according to the above method, since the input power Win is obtained by multiplying the detection voltage IQ1 by the predetermined coefficient α, the arithmetic circuit 33 for calculating the input power Win can be simplified. .

  When the input power Win obtained by the above equation is transmitted to the external device via the communication line Ls, the input power Win can be confirmed on the external device side and is input to the drive circuit 31. The feedback control of the lighting circuit 2 becomes possible.

  Next, FIG. 1B is an example of the detection circuit 32 and the arithmetic circuit 33. The detection circuit 32 includes a series circuit of a resistor R1 and a capacitor C4, and one end of the capacitor C4 (the end opposite to the resistor R1). Is connected to ground. The detection circuit 32 detects the one-end voltage V0 of the resistor Rd (hereinafter referred to as the detection voltage V0). Since the series circuit of the resistor R1 and the capacitor C4 serves as a low-pass filter, the detection voltage V0 is not a steep current having a peak flowing through the switching element Q1, but an averaged input current effective value. The value is proportional to.

  On the other hand, the arithmetic circuit 33 is an inverting amplifier circuit composed of an operational amplifier OP1 and resistors R2 and R3, and a non-inverting input terminal (+ terminal) of the operational amplifier OP1 is connected to the ground. Further, the inverting input terminal (− terminal) of the operational amplifier OP1 is connected to the connection point between the resistor R1 and the capacitor C4 via the resistor R2, and further, the inverting input terminal and the output terminal are connected via the resistor R3. Yes. The voltage value amplified by the operational amplifier OP1 by adjusting constants such as the resistors R1 and R2 is an electric signal (voltage signal) Win proportional to the input power. As described above, when the detection voltage is amplified using the operational amplifier OP1, the detection voltage may be small, so that the loss in the resistor Rd can be kept low.

  Further, FIG. 4 is a graph showing the relationship between the detection voltage and the input power, where the horizontal axis is the detection voltage V0 and the vertical axis is the input power Win. The solid line a in the figure shows the case where the power supply voltage is 200 VAC, and the broken line b shows the case where the power is 100 VAC. In each case, the line is a straight line passing through the origin, so that the input power Win proportional to the detection voltage V0 is obtained. It can be done.

  Thus, according to the present embodiment, the output voltage of the conversion circuit 1 (the voltage across the electrolytic capacitor C1) is controlled to be constant by feedback control by the drive circuit 30, so that the output voltage and the conversion circuit 1 are controlled. The output power of the conversion circuit 1 can be obtained from the input current Iin to the input power, and the input power can be obtained by calculating back from this output power. Therefore, since only the input current needs to be detected in order to obtain the input power, the circuit for obtaining the input power (in this example, composed of the detection circuit 32 and the arithmetic circuit 33) should be simplified as compared with the conventional example. Can do. In addition, since the voltage proportional to the input current is detected when detecting the input current, the cost can be reduced and the device can be downsized compared to the case where the input current is detected using a current transformer. There is an advantage of becoming. Furthermore, when the electrical signal Win is output to the communication line Ls as in the present embodiment, it is possible to check the input power to the lighting device A at a remote place away from the lighting device A.

  In the present embodiment, the case where the conversion circuit 1 is a step-up chopper circuit has been described as an example. However, for example, a step-up / step-down chopper circuit, a step-down chopper circuit, a flyback converter, or the like may be used, and the present invention is not limited to this embodiment. . In this embodiment, an amplifier circuit using the operational amplifier OP1 is configured as the arithmetic circuit 33. For example, the detection voltage V0 may be used as it is as the electric signal Win, and in this case, the operational amplifier is unnecessary, so Simple circuit configuration. Furthermore, in this embodiment, an analog value (voltage value) is used as the electrical signal Win, but it may be digitally processed. In this case, the digital signal processed using the A / D converter circuit is the communication line. What is necessary is just to make it output to Ls.

  Here, FIG. 2 shows another example of the present embodiment. In FIG. 1A, the conversion circuit 1 is an AC-DC conversion circuit, and the output of the AC-DC conversion circuit is AC-converted by an inverter circuit. In this example, the conversion circuit 1 is a DC-DC conversion circuit, and the DC output of the DC-DC conversion circuit is supplied to a light-emitting diode LD that is a load. Supply. The rest of the configuration is the same as in FIG. Also in this case, the input power Win can be obtained by detecting the voltage proportional to the current flowing through the switching element Q1 of the conversion circuit 1 (that is, the detection voltage V0) by the detection circuit 32. As a result, the circuit is simplified as well. And cost reduction.

(Embodiment 2)
Embodiment 2 of the lighting device A according to the present invention will be described with reference to FIGS. 3 and 4. In the lighting device A of the present embodiment, a power supply voltage of AC 100 V or AC 200 V is selectively connected, and the power supply voltage can be determined based on the detection voltage of the detection circuit 32. Further, a coefficient to be multiplied by the detection voltage is switched according to the determination result, and these points are different from the first embodiment. In addition, the same code | symbol is attached | subjected to the component same as Embodiment 1, and description is abbreviate | omitted.

  FIG. 3 shows an example of the detection circuit 32 and the arithmetic circuit 33 according to the present embodiment. Since the detection circuit 32 is the same as that of the first embodiment, the description thereof is omitted. On the other hand, the arithmetic circuit 33 includes a comparator COMP1 and a multiplier MULT. The output terminal of the detection circuit 32 (a connection point between the resistor R1 and the capacitor C4) is connected to the negative side input terminal of the comparator COMP1. A DC power source Vd is connected to the plus side input terminal of the comparator COMP1. The output terminal of the detection circuit 32 is connected to one input terminal of the multiplier MULT, and one of the DC power sources V1 and V2 is connected to the other input terminal via the switch SW. . Note that the switch SW can be switched to either the DC power source V1 or the DC power source V2 in accordance with the output result of the comparator COMP1.

  Here, when the power of the illumination load (for example, a fluorescent lamp) is constant, the magnitude of the current flowing through the switching element Q1 is different when the power supply voltage is AC100V and AC200V. That is, assuming that the current flowing through the switching element Q1 when the power supply voltage is AC100V is I1 and the current flowing through the switching element when the power supply voltage is AC200V is I2, the relationship of I1> I2 holds, and this relationship is the detection voltage (both ends of the capacitor C4). Voltage) V0 is reflected as it is.

  FIG. 4 shows the detection voltage V0 when the power supply voltage is AC100V and AC200V. In this embodiment, the detection voltage V0 at AC100V and the detection voltage V0 at AC200V do not overlap. The reference voltage Vd is set during When the power supply voltage is AC100V, the detection voltage V0 is higher than the reference voltage Vd as shown by the broken line b in the figure. At this time, the output of the comparator COMP1 becomes L level, so the switch SW is turned to the DC power supply V1 side. Can be switched. The multiplier MULT calculates the input power Win by multiplying the detection voltage V0 and the output value (coefficient) of the DC power supply V1. Note that the output value of the DC power supply V1 may be set to a value such that the calculation result in the multiplier MULT is the input power.

  Further, even when the detection voltage V0 changes between 40% V and 100% V by dimming the lamp LA, the voltage region higher than the reference voltage Vd is changed as shown by the broken line b. Therefore, also in this case, the output of the comparator COMP1 is at the L level, and the DC power supply V1 is connected to the other input terminal of the multiplier MULT. In the multiplier MULT, the input power Win is calculated by multiplying the detection voltage V0 and the output value of the DC power supply V1.

  On the other hand, when the power supply voltage is 200V AC, the detection voltage V0 is lower than the reference voltage Vd as shown by the solid line a in the figure. At this time, the output of the comparator COMP1 is at the H level. Switched to the side. The multiplier MULT calculates the input power Win by multiplying the detection voltage V0 and the output value (coefficient) of the DC power supply V2. Note that the output value of the DC power supply V2 may be set to a value such that the calculation result in the multiplier MULT is the input power.

  Further, even when the detection voltage V0 changes between 10% V and 30% V by dimming the lamp LA, the voltage region lower than the reference voltage Vd changes as shown by the solid line a. Therefore, also in this case, the output of the comparator COMP1 is at the H level, and the DC power source V2 is connected to the other input terminal of the multiplier MULT. In the multiplier MULT, the input power Win is calculated by multiplying the detection voltage V0 and the output value of the DC power supply V2.

  Thus, according to the present embodiment, the coefficient is changed according to the detection voltage of the detection circuit 32 (in this example, the voltage on the switching element Q1 side in the resistor Rd) V0, and the input power source is switched. Even when the detection voltage V0 is changed, the power supply voltage can be determined from the detection voltage V0 and the input power can be calculated using the coefficient α corresponding to the power supply voltage. The lighting device A can be provided.

  In the present embodiment, the case where two types of input power sources are AC100V and AC200V has been described as an example, but the number of input power sources is not limited to the present embodiment, and may be three or more. In this case, by setting the same number of coefficients as the input power supply that may be connected, the input power corresponding to the input power supply can be calculated even when the input power supply is changed. A lighting device A that can accommodate a wide range of input power sources can be realized. Moreover, the input power supply of this embodiment is an example, Comprising: The power supply of another voltage value (for example, AC277V etc.) may be sufficient. Furthermore, in this embodiment, the coefficient is switched in an analog manner by the switch SW. However, for example, when a microcomputer is used, the coefficient can be switched with reference to a data table or the like. Also in the present embodiment, a DC-DC conversion circuit may be used as the conversion circuit, and the DC output of the DC-DC conversion circuit may be supplied to a light emitting diode that is a load.

(Embodiment 3)
Embodiment 3 of the lighting device A according to the present invention will be described with reference to FIGS. 5 and 6. In the second embodiment, since the voltage range of the detection voltage does not overlap with the type of power supply, the reference voltage is set to a constant value. However, in this embodiment, the voltage range of the detection voltage overlaps with the type of power supply, so the reference voltage is variable. . In addition, about another structure, it is the same as that of Embodiment 2, and attaches | subjects the same code | symbol to the same component, and abbreviate | omits description.

  The lighting device A of the present embodiment includes a conversion circuit 1, a lighting circuit 2, and a control circuit 3. An arithmetic circuit 33 of the control circuit 3 is connected to an arithmetic circuit 33 from an external device (not shown) via a communication line Ls. A dimming signal PWM is input. As shown in FIG. 5B, the output voltage of the DC power supply Vd (that is, the reference voltage Vd) can be changed according to the dimming signal PWM. Note that the lighting device A of the present embodiment has a dimming function that adjusts the output of the conversion circuit 1 or the lighting circuit 2 according to the dimming signal PWM, and has a dimming level according to the dimming signal PWM. The lamp LA is turned on.

  Here, in the above-described second embodiment, there is no overlapping region between the detection voltage V0 of the detection circuit 32 when the power supply voltage is AC100V and the detection voltage V0 of the detection circuit 32 when the power supply voltage is AC200V. The boundary (the one-dot chain line c in FIG. 4) could be determined by the voltage. For example, when the range that the power supply voltage can take is narrow (for example, AC100V and AC120V, or AC200V and AC240V) or the dimming range is wide ( A boundary cannot be defined by a constant reference voltage at a portion indicated by a two-dot chain line in FIG.

  Therefore, in the present embodiment, by adjusting the output voltage of the DC power supply Vd in accordance with the dimming signal PWM input via the communication line Ls, the double power supply voltage as shown by the one-dot chain line c ′ in FIG. A boundary line (reference voltage Vd) for identifying is set. In the present embodiment, the reference voltage Vd is linearly increased according to the dimming signal PWM. For example, in the case of a low luminous flux, the reference voltage Vd is low, and as the luminous flux increases, the reference voltage Vd is increased. Thus, the output voltage of the DC power supply Vd is adjusted.

  Next, the operation of the arithmetic circuit 33 will be described. In FIG. 6, a solid line a 'indicates a case where the power supply voltage is AC 200V, and a broken line b' indicates a case where the power supply voltage is AC 100V. First, when the dimming signal PWM is input to the arithmetic circuit 33 from the external device via the communication line Ls, the output voltage of the DC power supply Vd is set so that the arithmetic circuit 33 becomes a reference voltage corresponding to the dimming signal PWM. Adjusted. When the detection voltage V0 (the voltage across the capacitor C4) of the detection circuit 32 is higher than the reference voltage Vd (that is, when the power supply voltage is AC100V), the output of the comparator COMP1 becomes L level. SW is switched to the DC power supply V1 side, and the input power Win is calculated from the detection voltage V0 and the output value of the DC power supply V1.

  On the other hand, when the detection voltage V0 of the detection circuit 32 is lower than the reference voltage Vd (that is, when the power supply voltage is AC200V), the output of the comparator COMP1 becomes H level, so that the switch SW is turned to the DC power supply V2 side. The input power Win is calculated from the detected voltage V0 and the output value of the DC power supply V2.

  In other words, according to the present embodiment, even when the detection voltages overlap with different power supply voltages, it is possible to provide a boundary line for identifying both, so that a coefficient corresponding to each power supply voltage can be selected. Thus, accurate input power can be calculated.

  Thus, according to the present embodiment, since the coefficient is changed according to the dimming signal PWM, the input power corresponding to the dimming level can be calculated even when the dimming level is changed. In addition, when the coefficient is set according to the magnitude relationship between the detection voltage V0 of the detection circuit 32 and the reference voltage Vd determined by the dimming signal PWM as in the present embodiment, a simpler arithmetic circuit 33 is used. The provided lighting device A can be realized.

  The boundary line is preferably provided between two power supply voltages. For example, when the power supply voltage is AC100V and AC200V as in the present embodiment, a straight line corresponding to AC150V is set as the boundary line. Is good. Also in this embodiment, a DC-DC conversion circuit may be used as the conversion circuit 1 and the DC output of the DC-DC conversion circuit may be supplied to a light emitting diode as a load.

(Embodiment 4)
Embodiment 4 of the lighting device A according to the present invention will be described with reference to FIGS. 7 and 8. The present embodiment is different from the second embodiment in that the circuit abnormality is detected based on the input power Win that is the calculation result of the arithmetic circuit 33, and other configurations are the same as those of the second embodiment. Since it is the same, the same code | symbol is attached | subjected to the same component and description is abbreviate | omitted.

  In the lighting device A of the present embodiment, as shown in FIG. 7, an abnormality detection circuit 34 that detects an abnormality of the circuit based on the input power Win that is the calculation result of the calculation circuit 33 is provided.

  The abnormality detection circuit 34 includes comparators COMP 2 and 3 and a NAND circuit, and the negative input terminal of the comparator COMP 2 and the positive input terminal of the comparator COMP 3 are connected to the output terminal of the multiplier MULT of the arithmetic circuit 33. ing. The positive side input terminal of the comparator COMP2 is connected to the connection point of resistors R4 and R5 connected in series, and the negative side input terminal of the comparator COMP3 is connected to the connection point of resistors R5 and R6 connected in series. ing. The output terminals of the comparators COMP2 and COMP3 are connected to the input terminals of the NAND circuits, respectively, so that the control signal FG corresponding to the output values of the comparators COMP2 and COMP3 is output from the NAND circuit. It has become.

  One end of the series circuit composed of the resistors R4 to R6 (the end of the resistor R4) is connected to the communication line so that the dimming signal PWM is input, and the other end of the series circuit (resistor The end of R6 is connected to the ground. Further, a control power supply Vcc is connected to the output terminals of the comparators COMP2 and COMP3 via resistors R7 and R8, respectively.

  Next, the operation of the abnormality detection circuit 34 will be described. FIG. 8 is a graph in which the horizontal axis indicates the dimming level and the vertical axis indicates the input power Win. The hatched portion d in the figure indicates a region where the lamp is normally lit, and the other regions indicate regions in an abnormal state. Yes. Therefore, assuming that the value of the input power Win for normal lighting is V (nom), V3 ≦ V (nom) ≦ V4 when the dimming level is Dim, and V3 ′ ≦ V when the dimming level is Full. (Nom) ≦ V4 ′. The dimming level is Dim when the illuminance is the lowest, and the Full state is when the illuminance is the highest (that is, fully lit).

  Here, in the case where the dimming level is set to Dim, when the output Win of the multiplier MULT of the arithmetic circuit 33 is larger than V4, the output of the comparator COMP2 is L level and the output of the comparator COMP3 is H level. Therefore, the control signal FG of the NAND circuit becomes H level. When the output Win of the multiplier MULT is smaller than V3, the output of the comparator COMP2 becomes H level and the output of the comparator COMP3 becomes L level, so that the control signal FG of the NAND circuit becomes H level.

  On the other hand, when the output Win of the multiplier MULT is not less than V3 and not more than V4, the output of the comparator COMP2 is H level and the output of the comparator COMP3 is H level, so that the control signal FG of the NAND circuit is L level. Therefore, from the above result, when the control signal FG is at the H level, it is in an abnormal state. Therefore, it is only necessary to control the drive circuit to reduce or stop the output of the conversion circuit and the lighting circuit. In the case where the dimming level is other than Dim, the operation of the abnormality detection circuit 34 is the same except that the input power Win and the reference values V3 and V4 are different.

  Thus, according to the present embodiment, when the input power Win exceeds the predetermined range, it is determined that there is an abnormality, and the output of the conversion circuit or the lighting circuit is reduced or stopped, so that an abnormality has occurred. And the apparatus can be operated in a safe direction to protect the apparatus and the lighting load connected to the apparatus.

  Note that the probability of erroneous detection can be reduced when a logical product is obtained from the output signal of abnormality detection (for example, no-load detection) generally performed in the inverter circuit and the control signal FG. Also in the present embodiment, a DC-DC conversion circuit may be used as the conversion circuit, and the DC output of the DC-DC conversion circuit may be supplied to a light emitting diode that is a load.

(Embodiment 5)
Embodiment 5 of the lighting device A according to the present invention will be described with reference to FIGS. 9 and 10. The present embodiment is different from the third embodiment in that the input power Win that is the calculation result of the calculation circuit 33 is accumulated and used as a reference value for feedback control. Since other configurations are the same as those of the third embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. Further, in FIGS. 10A and 10B, the storage unit 35 is not shown in order to simplify the illustration.

  The lighting device A of the present embodiment includes a conversion circuit 1, a lighting circuit 2, and a control circuit 3, and the control circuit 3 includes drive circuits 30 and 31, a detection circuit 32, an arithmetic circuit 33, and a storage unit 35. It is configured. The storage unit 35 is configured to store the input power Win that is the calculation result of the calculation circuit 33, and the input power Win stored in the storage unit 35 is used as the reference value Win ′ in the calculation circuit 33. . At the construction stage, a resistance corresponding to the lamp power is connected as a load, and the input power Win obtained as a result is stored in the storage unit 35. When the lamp LA is initially turned on, the input power Win by the resistance is the reference. Used as the value Win '.

  Further, when the lamp LA is turned on after the construction, the input power Win calculated by the arithmetic circuit 33 is accumulated in the storage unit 35, and in the subsequent operations, the input power Win accumulated when the lamp is lit is used as the reference value Win ′. It will be. Then, as shown in FIG. 10A, when the input power Win is output from the arithmetic circuit 33 to the drive circuit 30, the drive circuit 30 is connected to the conversion circuit so that the input power Win matches the reference value Win ′. In the case where the operating frequency of one switching element Q1 is controlled and the input power Win is output from the arithmetic circuit 33 to the drive circuit 31 as shown in FIG. 10B, the input power Win and the reference value Win ′ are The drive circuit 31 controls the operating frequencies of the switching elements Q2 and Q3 of the lighting circuit 2 so as to match.

  Thus, according to the present embodiment, an electric signal corresponding to the input power Win is input to the drive circuit 30 or the drive circuit 31 and feedback control is performed, so that the input power Win is controlled to the same level as the reference value Win ′. In addition, when the reference value Win ′ can be changed as in the present embodiment, there is an advantage that it can be controlled to an arbitrary input power.

  In addition, since the both-ends voltage (input voltage to the lighting circuit 2) of the electrolytic capacitor C1 can be controlled by feedback-controlling the conversion circuit 1 with the drive circuit 30, for example, when the said both-ends voltage is reduced according to light control. Can maintain the efficiency of the lighting circuit 2 high in the entire dimming range. In this embodiment, the input power Win accumulated in the storage unit 35 is set as the reference value Win ′. For example, an illuminance sensor (not shown) is connected as an external device, and the reference value is input from the illuminance sensor. In this case, the brightness of the illumination space can be kept constant by adjusting the reference value so that the illuminance detected by the illuminance sensor becomes a predetermined illuminance.

(Embodiment 6)
Embodiments of a lighting fixture B and a lighting system according to the present invention will be described with reference to the drawings. As shown in FIG. 11, the lighting fixture B includes the lighting device A described in any one of the first to fifth embodiments, a substantially rectangular box-shaped fixture body 4 in which the lighting device A is stored, and the length of the fixture body 4. A pair of sockets 5 and 5 disposed on both sides in the direction and a straight tube type lamp LA are provided. And in this lighting fixture B, the lighting electric power from the lighting device A is supplied to the lamp | ramp LA via both sockets 5 and 5, and the said lamp | ramp LA lights up.

  According to this structure, the lighting fixture B which can detect input electric power can be provided, suppressing cost increase by using the lighting device A in any one of Embodiments 1-5.

  In addition, as shown in FIG. 12, the lighting system includes a plurality of (N in FIG. 12, N ≧ 2) lighting fixtures B and a control device C connected via a communication line Ls. These are individually controlled by the control device C. That is, each lighting fixture B is turned on or off according to a control signal from the control device C. Further, in the control device C, the input power calculated in the lighting device (not shown) of each lighting fixture B is transmitted via the communication line Ls and displayed on the display unit (not shown) of the control device C. It is like that.

  According to this configuration, the input power to the lighting device of each lighting fixture B can be collectively confirmed by the control device C.

DESCRIPTION OF SYMBOLS 1 Conversion circuit 2 Lighting circuit 30 Drive circuit (1st drive circuit)
32 detection circuit 33 arithmetic circuit A lighting device AC commercial AC power supply LA lamp Q1 switching element

Claims (13)

  A conversion circuit comprising a switching element for converting an input power source into a DC power supply having a desired voltage value; a detection circuit for detecting a voltage proportional to a current flowing through the switching element; and a lamp for receiving a DC output of the conversion circuit. A lighting circuit for lighting, a first driving circuit for driving and controlling the switching element according to the voltage value of the DC output, and an operation for outputting an electric signal proportional to the input power based on the voltage detected by the detecting circuit A lighting device comprising: a circuit;   2. The conversion circuit according to claim 1, wherein the input circuit includes an AC-DC conversion circuit in which the input power supply is an AC power supply, or a DC-DC conversion circuit in which the input power supply is a DC power supply. Lighting device.   The lighting device according to claim 1, wherein the arithmetic circuit calculates the input power by multiplying a voltage detected by the detection circuit by a predetermined coefficient.   The lighting device according to claim 3, wherein the arithmetic circuit changes the coefficient according to a voltage detected by the detection circuit.   A dimming function for controlling an output of the conversion circuit or the lighting circuit in accordance with a dimming signal input to the arithmetic circuit, wherein the arithmetic circuit uses the voltage detected by the detection circuit and the dimming signal; 4. The lighting device according to claim 3, wherein the coefficient is changed accordingly.   The lighting device according to claim 5, wherein the arithmetic circuit changes the coefficient according to a magnitude relationship between a voltage detected by the detection circuit and a reference value determined by the dimming signal.   The arithmetic circuit is preset with the same number of the coefficients as the number of the input power supplies selectively connected to the conversion circuit, and selects from the coefficients according to the input power supplies to be connected. The lighting device according to any one of claims 4 to 6.   The arithmetic circuit is at least one of the first drive circuit, a second drive circuit that drives and controls a switching element that forms the lighting circuit, and an external device connected to the arithmetic circuit via a communication line. The lighting device according to any one of 1 to 7, wherein the electric signal is output to one of the two.   The electrical signal is input to at least one of the first and second drive circuits, and the drive circuit corresponds to a switching element corresponding to an input power indicated by the electrical signal that matches a preset reference value. The lighting device according to claim 8, wherein the lighting is controlled.   The lighting device according to claim 9, wherein the reference value is input from the external device via the communication line.   When the electric signal is input to at least one of the first and second drive circuits, and the input power indicated by the electric signal exceeds a preset range, the drive circuit is configured to convert the conversion circuit or the lighting circuit. The lighting device according to any one of claims 8 to 10, wherein the corresponding switching element is driven and controlled so that the output of the light source decreases or stops.   A lighting apparatus comprising the lighting device according to any one of claims 1 to 11.   A plurality of lighting fixtures according to claim 12 are connected to a control device via a communication line, and each lighting fixture is individually controlled by the control device.

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