JP2016025076A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can be controlled so that the power consumption can be automatically reduced more greatly when the light device is connected to a power storage battery than when the light device is connected to a commercial power source.SOLUTION: A lighting device has a rectifying circuit 10 for rectifying a voltage input from an input terminal 50 to a DC voltage, a power conversion circuit 13 for converting the power rectified in the rectifying circuit 10, an output terminal 60 connected to a light source 2 which is supplied with the output voltage of the power conversion circuit 13, a power source determining unit 41 for determining whether power input from the input terminal 50 is DC power or AC power, and a controller 42 controlling the power conversion circuit 13 so that the value of current output to the light source 2 is lower when the power source determining unit 41 determines that the DC power is input than when the power source determining unit 41 determines that the AC power is input.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device.

  As a conventional lighting lighting device, like the lighting device of Patent Document 1, after rectifying the AC voltage of a commercial power source into a DC voltage, the current value flowing through the light source is converted to a predetermined current value and used as a light source. There was something to supply. The lighting device disclosed in Patent Document 1 includes a rectifier circuit that rectifies AC power into DC power, a step-up chopper circuit and a step-down chopper circuit as a power conversion circuit that converts an output voltage of the rectifier circuit, and a current value flowing through a light source is a predetermined current. A device with a control device that performs control so as to be a value is shown.

JP 2013-232394 A

  2. Description of the Related Art In recent years, a power supply switching device that detects a commercial power failure and supplies power stored in a storage battery to equipment in a building has been put into practical use in preparation for a commercial power failure caused by a disaster. In a building where such a power supply switching device is used, a lighting device as in Patent Document 1 is also used. Since the lighting device of Patent Literature 1 controls the current value flowing through the light source to be a predetermined current value, even if the power source is switched to a storage battery due to a power failure of the commercial power source, it is the same as when the commercial power source is connected. However, there is a problem that power consumption cannot be suppressed.

  The present invention has been made in view of the above problems, and an object of the present invention is to obtain a lighting device that can suppress power consumption when a DC power source is connected compared to power consumption when the AC power source is connected.

  The lighting device of the present invention includes a power supply determination unit that determines whether the voltage input from the input terminal is a direct current or an alternating current, and the voltage input from the input terminal by the power supply determination unit is a direct current When it is determined, the power conversion circuit is controlled so that the value of the current flowing to the light source via the output terminal is lower than when it is determined that the voltage input from the input terminal is alternating current. .

  The lighting device according to the present invention determines whether the voltage input from the input terminal is an AC power supply or a DC power supply, and when it is determined to be DC, the current value output to the light source is lower than when it is determined to be AC. Therefore, it is possible to suppress power consumption when a voltage is supplied from the DC power supply.

2 is a circuit diagram showing a power supply unit and a lighting fixture according to Embodiment 1. FIG. 4 is a graph showing a change over time of a voltage across a resistor 12c input to the control circuit according to the first embodiment. 4 is a flowchart of control during constant current control of the boost chopper circuit according to the first embodiment. 3 is a flowchart of control during constant current control of the step-down chopper circuit according to the first embodiment. 3 is a flowchart of abnormality detection control of the lighting device according to Embodiment 1. It is a circuit diagram which shows the power supply part and lighting fixture which concern on Embodiment 2. FIG. 6 is a flowchart of control during constant current control of the step-down chopper circuit according to the second embodiment.

Embodiment 1 FIG.
FIG. 1 is a circuit diagram showing a power supply unit and a lighting fixture according to Embodiment 1 of the present invention. The output side of the power supply unit 3 and the input terminal 50 in the lighting device 1 of the lighting fixture 100 are connected, and power from the power supply unit 3 is supplied to the lighting fixture 100 so that the light source 2 of the lighting fixture 100 is turned on.

  The power source unit 3 includes an AC power source 3a such as a commercial power source, a DC power source 3b such as a storage battery, and a power source switching unit 3c that switches the AC power source 3a or the DC power source 3b to be electrically connected to the lighting device 1. And have. In addition, the power supply switching unit 3c normally connects the lighting device 1 and the AC power source 3a electrically, and detects the stop of the AC power source 3a in an emergency when the AC power source 3a stops, and detects the lighting device 1 and the DC power source 3b. Are configured to be electrically connected.

  The lighting fixture 100 includes a lighting device 1 having a pair of input terminals 50 and a pair of output terminals 60, and a light source 2 connected to the output terminal 60 of the lighting device 1. As described above, the power supply unit 3 is connected to the input terminal 50 of the lighting device 1, and the lighting device 1 lights the light source 2 using the power supplied from the power supply unit 3.

  The lighting device 1 of the lighting fixture 100 includes a rectifier circuit 10 connected to an input terminal 50, a capacitor 11 connected to a high potential side and a low potential side of the rectifier circuit 10, and power conversion connected in parallel to the capacitor 11. The circuit 13 and the control circuit 40 that controls the power conversion circuit 13 are included. Further, a rectified voltage detection circuit 12 composed of resistors 12a, 12b and 12c is connected in parallel with the power conversion circuit 13 on the output side of the rectifier circuit 10, and an output detection composed of resistors 14a, 14b and 14c. The circuit 14 is connected in parallel to the output terminal 60, and the boosted voltage detection circuit 15 including resistors 15 a, 15 b, and 15 c is connected inside the power conversion circuit 13.

  The rectifier circuit 10 rectifies the power input from the input terminal 50 into DC power. In the first embodiment, a diode bridge circuit that performs full-wave rectification is used. When the AC power from the AC power source 3a is supplied to the input terminal 50, the rectifier circuit 10 rectifies and outputs the power of the AC power source 3a to DC power, and the DC power is supplied to the input terminal 50 from the DC power source 3b. In the case where it is done, the power of the DC power source 3b is output as it is. Further, the output power of the rectifier circuit 10 is input to the power conversion circuit 13.

On the output side of the rectifier circuit 10, a rectified voltage detection circuit 12 for detecting the output voltage V _rout of the rectifier circuit 10 is connected in parallel to the power conversion circuit 13. The rectified voltage detection circuit 12 is configured by connecting a resistor 12a, a resistor 12b, and a resistor 12c in series. The voltages at both ends of the resistor 12a, the resistor 12b, and the resistor 12c are proportional to the output voltage V _rout of the rectifier circuit 10. doing. Therefore, the output voltage V _rout of the rectifier circuit 10 can be detected from the voltage across at least one of the resistor 12a, the resistor 12b, and the resistor 12c. In the first embodiment, the rectified voltage detection circuit 12 includes the resistors 12a, 12b, and 12c. However, the present invention is not limited to this, and the number of resistors can be used as long as the output voltage V _rout of the rectifier circuit 10 can be detected. Is not limited.

  The power conversion circuit 13 is a circuit that converts the DC power rectified by the rectification circuit 10 into power suitable for lighting the light source 2. The power conversion circuit 13 includes a step-up chopper circuit 20 and a step-down chopper circuit 30 connected to the output side of the step-up chopper circuit 20. A boosted voltage detection circuit 15 is connected to both ends of the boost chopper circuit 20 on the output side.

  The step-up chopper circuit 20 includes an inductor 21 having one end connected to the high potential side of the rectifier circuit 10, a switching element 22 to which the other end of the inductor 21 is connected, and a low level of the rectifier circuit 10 connected in series with the switching element 22. A resistor 23 connected to the potential side, a diode 24 having an anode terminal connected between the inductor 21 and the switching element 22, a positive electrode connected to the cathode terminal of the diode 24, and a negative electrode connected to the low potential side of the rectifier circuit 10 The capacitor 25 is provided.

  In the step-up chopper circuit 20 configured as described above, when the switching element 22 is on, the current flows from the high potential side to the low potential side in the order of the inductor 21, the switching element 22, and the resistor 23. Accumulated. At that time, the reactor current flowing through the inductor 21 increases with a slope corresponding to the inductance value of the inductor 21. When the switching element 22 is off, the current flows from the high potential side to the low potential side in the order of the inductor 21, the diode 24, and the capacitor 25, and the energy accumulated in the inductor 21 is released. At that time, the reactor current flowing through the inductor 21 decreases with a slope corresponding to the inductance value of the inductor 21. Thus, since the energy accumulated in the inductor 21 is superimposed on the input voltage input to the boost chopper circuit 20, the output voltage of the boost chopper circuit 20 becomes higher than the input voltage, and the output voltage is the switching element 22. It depends on the frequency of on / off and the duty ratio. Further, the step-up chopper circuit 20 can step up and output the input from the rectifier circuit 10 by repeatedly turning on and off the switching element 22 at a frequency sufficiently higher than the frequency of the AC power supply 3a, for example, several tens of kHz. In addition, the power factor can be improved by making the input current waveform and the input voltage waveform substantially equal.

  The step-down chopper circuit 30 includes a switching element 31 connected to the positive electrode of the capacitor 25 of the step-up chopper circuit 20, and a diode 32 connected to the switching element 31 and the cathode terminal and connected to the anode terminal on the low potential side of the rectifier circuit 10. A series circuit including an inductor 33, a capacitor 34, and a current detection resistor 35 connected in parallel with the diode 32. The output of the step-down chopper circuit 30 is connected so as to be output to the output terminal 60. The capacitor 34 and the light source 2 are connected in parallel via the output terminal 60, and the current detection resistor 35 and the light source 2 are connected in series. Connected to. Since the voltage across the current detection resistor 35 is proportional to the current output from the output terminal 60 and flowing through the light source 2, the current output from the output terminal 60 and flowing through the light source 2 is detected from the voltage across the current detection resistor 35. can do. The current detection resistor 35 corresponds to the current detection circuit of the present invention.

  Since the step-down chopper circuit 30 is configured in this way, when the switching element 31 is on, current flows in the order of the switching element 31 and the inductor 33, energy is stored in the inductor 33, and at the same time, the step-down chopper circuit 30 Power is output to the light source 2 via the output terminal 60. When the switching element 31 is on, the value of the current flowing through the inductor 33 increases with a slope corresponding to the inductance value of the inductor 33. When the switching element 31 is off, the energy accumulated in the inductor 33 is released, and power is supplied to the light source 2 via the output terminal 60. When the switching element 31 is on, the value of the current flowing through the inductor 33 decreases with a slope corresponding to the inductance value of the inductor 33. For this reason, the value of the current flowing through the light source 2 when the switching element 31 is turned on and off becomes a pulsating flow depending on the inductance value of the inductor 33, but the pulsating flow component is smoothed by the capacitor 34 and supplied to the light source 2. For this reason, the output current of the step-down chopper circuit 30 is determined according to the on / off frequency and duty ratio of the switching element 31, and the step-down chopper circuit 30 steps down the voltage by controlling the output current.

  On the output side of the step-down chopper circuit 30, that is, the output side of the power conversion circuit 13, an output detection circuit 14 for detecting an output voltage at the output terminal 60 is connected in parallel to the output terminal 60. The output detection circuit 14 is configured by connecting a resistor 14a, a resistor 14b, and a resistor 14c in series, and the voltage across each of the resistors 14a, 14b, and 14c is proportional to the output voltage at the output terminal 60. . Therefore, the output voltage at the output terminal 60 can be detected from the voltage across at least one of the resistor 14a, the resistor 14b, and the resistor 14c. In the first embodiment, the output detection circuit 14 includes the resistors 14a, 14b, and 14c. However, the number of resistors is not limited as long as the output voltage at the output terminal 60 can be detected.

  The control circuit 40 also detects the voltage across the resistor 12 c as the output voltage from the rectified voltage detection circuit 12, the voltage across the resistor 14 c as the output voltage of the output detection circuit 14, and the current flowing through the light source 2. The resistors are connected to each other so that the voltage between both ends of the current detecting resistor 35 is input as a voltage for the operation. The control circuit 40 controls the power conversion circuit 13 using these voltage values, and controls the power output from the output terminal 60.

The light source 2 is turned on by the electric power output from the output terminal 60 of the lighting device 1, and in the first embodiment, an LED lamp having an LED element as a light emitting element is used. The light source 2 has a rated voltage value V _r and the rated current I _r is determined, the rated voltage value V _r of the voltage and current output from the output terminal 60 of the lighting device 1 is a light source 2 and the rated current I It is controlled not to exceed _r . The rated voltage value V _r and the rated current value I _r of the light source 2 vary depending on, for example, the number of LED elements to be lit, the connection method of LED elements such as series connection and parallel connection, and the type of LED elements. In the first embodiment, an LED lamp is used as the light source 2, but the light source is not limited to this, and power of an organic EL lamp or a fluorescent lamp having an organic EL element as a light emitting element is converted into light. Any device is acceptable.

  Next, the control circuit 40 will be described. The control circuit 40 includes a power determination unit 41 that determines whether the power input to the input terminal 50 is direct current or alternating current, a control unit 42 that controls lighting of the light source 2, a power determination unit 41, and a control. And a storage unit 43 that stores setting values used in the unit 42.

The power source determination unit 41 determines whether the power input from the input terminal 50 is direct current or alternating current by detecting a change in the voltage across the resistor 12c, that is, the output voltage _Vrout of the rectifier circuit 10. it can. As a determination method, for example, the voltage at both ends of the resistor 12c is sampled at a sampling frequency set to a frequency higher than twice the frequency of the AC power supply 3a, and is based on the voltage fluctuation range obtained by the sampling. Thus, there is a method for determining whether the power input to the input terminal 50 is AC power or DC power. When a commercial power source is used as the AC power source 3a, the frequency of the AC power source 3a is 50 Hz or 60 Hz. Therefore, the determination is possible if the sampling frequency is higher than 120 Hz.

  FIG. 2 is a graph showing the time change of the voltage across the resistor 12c input to the control circuit 40 according to the first embodiment. FIG. 2A shows a graph of the voltage across the resistor 12c when AC power is input to the input terminal 50 from the AC power source 3a. When power is supplied from the AC power source 3a, the voltage across the resistor 12c becomes a pulsating current having a frequency twice as high as that of the AC power source 3a as shown in FIG. For this reason, the voltage across the resistor 12c varies with time, and the voltage value obtained by sampling varies with time. Note that the waveform in FIG. 2A is an example, and the waveform is not limited to this waveform as long as the input power to the power conversion circuit 13 is a pulsating flow with a change in voltage value.

  On the other hand, FIG. 2B shows a graph of the voltage across the resistor 12c when DC power is input to the input terminal 50 from the DC power source 3a. As shown in FIG. 2B, when power is supplied from the DC power supply 3b, the voltage across the resistor 12c is constant regardless of time, and the voltage value obtained by sampling is also constant.

Black dots in the graph of FIG. 2 are examples of measurement locations when the power source determination unit 41 samples. The power source determination unit 41 acquires, for example, five sampling values of the sampling frequency, that is, five detection values, and the difference between the maximum value and the minimum value of the five detection values is a threshold stored in the storage unit 43. If it is larger than the voltage difference _{Vth, the} power input to the input terminal 50 is determined to be alternating current, and if it is smaller than the threshold voltage difference _{Vth, the} power input to the input terminal 50 is determined to be direct current. In addition, the detection value which the power supply determination part 41 acquires at the time of determination is not restricted to five places, and determination is possible if there are two or more places.

  The control unit 42 controls the lighting of the light source 2 by controlling the output current output to the light source 2. The control unit 42 controls the constant current to keep the current value supplied to the light source 2 constant, and detects abnormality of the light source 2 and detects abnormality of the light source 2 and stops the supply of current to the light source 2 when it is determined to be abnormal. Two types of control are performed. The constant current control and the abnormality detection control are always performed when the lighting device 1 is driven.

  FIG. 3 is a flowchart of control during constant current control of the boost chopper circuit 20 according to the first embodiment. FIG. 4 is a flowchart of control during constant current control of the step-down chopper circuit 30 according to the first embodiment. At the time of constant current control, the control unit 42 controls the step-up chopper circuit 20 and the step-down chopper circuit 30 based on the flowcharts of FIGS.

The control of the step-up chopper circuit 20 by the control unit 42 during the constant current control will be described with reference to FIG. In step S <b> 11, the control unit 42 determines whether the power input to the input terminal 50 is alternating current. As described above, the power source determination unit 41 determines whether the power input from the input terminal 50 is AC or DC based on the voltage across the resistor 12c and the threshold voltage difference _Vth . Therefore, the control unit 42 acquires the determination of the power supply determination unit 41 and makes a determination based on the determination result of the power supply determination unit 41. If it is determined that the power input from the input terminal 50 is AC, the process proceeds to step S12. If it is determined that the power is not AC, that is, it is DC, the process proceeds to step S13.

  In step S12, the control unit 42 performs power factor correction control. In the power factor correction control, an input current waveform similar to the input voltage waveform input to the input terminal 50 based on the voltage across the resistor 12c or the voltage across the resistor 12c and the voltage across the current detection resistor 35 is obtained. As generated, the control unit 42 controls the on / off frequency and the duty ratio of the switching element 22. That is, in step S12, control of power factor improvement by a boost chopper circuit that is generally performed is performed. After the control in step S12, the process returns to step S11 again. When power is supplied from the AC power supply 3a as described above, the power factor correction control is performed by the boost chopper circuit 30, so that the power of the AC power supply 3a can be efficiently used for lighting the light source 2.

In step S <b> 13, the control unit 42 performs direct current step-up control on the step-up chopper circuit 20. In DC boost control, the control unit 42 controls the on / off frequency and duty ratio of the switching element 22 so that the boost target voltage value V _bm can be output. In the first embodiment, the following control is specifically performed as the DC boost control. First, when the input control voltage exceeds a predetermined value (starting voltage), the control unit 42 starts operation and starts switching of the switching element 22. The control unit 42 monitors the fluctuation of the voltage value of the resistor 12c and controls the switching of the switching element 22 so that the current flowing through the inductor 21 is proportional to the fluctuation of the voltage value (voltage waveform of the AC power supply). The voltage value of the resistor 15c is detected and set to a predetermined voltage (for example, 2V), and the switching of the switching element 22 is controlled. For example, when the voltage value of the resistor 12c is low (when the voltage value of the AC power supply is close to zero cross), the control unit 42 increases the on-duty of the switching element 22 and when the voltage value of the resistor 12c is high (AC power supply). When the voltage value of the switching element 22 is close to the peak), the on-duty of the switching element 22 is shortened, and the off-duty of the switching element 22 at each timing is controlled to be a period until the reactance current flowing through the inductor 21 becomes zero. To do. With this control, the duty ratio and the switching frequency when the control unit 42 controls the switching of the switching element 22 are determined.
When the switching element 22 is turned on, a current flows through a loop of the rectifier circuit 10 → the inductor 21 → the switching element 22 → the resistor 23 → the rectifier circuit 10, and the inductor 21 accumulates energy. Next, when the switching element 22 is turned off, current flows through the loop of the rectifier circuit 10 → the inductor 21 → the diode 24 → the capacitor 25 and the step-down chopper circuit 30 → the rectifier circuit 10, and the energy accumulated in the inductor 21 is released. . Thereby, the boost chopper circuit 20 can generate an output voltage higher than the input voltage input to the boost chopper circuit 20. The DC boost control according to the first embodiment is an example of DC boost control, and is not limited to this. The circuit configuration of the boost chopper circuit 20 is appropriately changed according to the circuit configuration of a step-down chopper circuit 30 described later. It doesn't matter.

Next, the control of the step-down chopper circuit 30 by the control unit 42 during the constant current control will be described with reference to FIG. In step S <b> 21, the control unit 42 acquires the voltage across the current detection resistor 35. Next, it progresses to step S22, and the control part 42 judges whether the electric power input into the input terminal 50 is alternating current in step S22. As described above, the power source determination unit 41 determines whether the power input from the input terminal 50 is AC or DC based on the voltage across the resistor 12c and the threshold voltage difference _Vth . Therefore, the control unit 42 acquires the determination of the power supply determination unit 41 and makes a determination based on the determination result of the power supply determination unit 41. If it is determined that the power input from the input terminal 50 is AC, the process proceeds to step S23. If it is determined that the power is not AC, that is, it is DC, the process proceeds to step S24. In step S23, the control unit 42 outputs the output current value I _O to the light source 2 based on the voltage across the current detection resistor 35 acquired in step S21. Control is performed to be equal to _oma . Specifically, the control unit 42 controls the on / off frequency and duty ratio of the switching element 31 to control the output current value I _O to be equal to the AC output target current value I _oma . After executing the control in step S23, the process returns to step S21. In step S24, the control unit 42 outputs the output current value I _O to the light source 2 based on the voltage across the current detection resistor 35 acquired in step S21. Control is performed so as to be equal to the value I _omd . Specifically, as in step S23, the control unit 42 controls the on / off frequency and duty ratio of the switching element 31 so that the output current value _IO becomes equal to the DC output target current value _Iomd. I have control. After executing the control in step S24, the process returns to step S21. By repeatedly performing the processing from step S21 to S24 in this manner, the output current value I _O to the light source 2 is set to the output target current value I _oma at the time of AC when the power input to the input terminal 50 is AC. When the power input to the input terminal 50 is DC, control is performed so that the output target current value I _omd during DC is constant.

Note that the AC at output target current value _{I oma,} DC at the output target current value _{I omd,} to the rated current value _{I r} of the light source 2 used in the lighting device _100, the _I omd _{<I oma} ≦ I _r The relationship is set to hold. In particular AC at the output target current value I _oma often set in the same current value as a rated current value I _r. Also, the illuminance of the emergency lighting is determined by laws and regulations such as the Building Standards Act, and the output target current value I _omd at the time of direct current is set to a current value such that the light source 2 emits illuminance according to the laws and regulations. Often done. Therefore, an AC when an output target current value I _oma, a DC at output target current value I _omd, is set according to the performance of the light source 2.

As described above, during the constant current control, the power conversion circuit 13 is controlled so that the output current value I _O to the light source 2 becomes equal to the AC output target current value I _oma or the DC output target current value I _omd. The brightness of the light source 2 can be stabilized and turned on. In addition, since the DC output target current value I _omd is smaller than the AC output target current value I _{oma, the} power is supplied from the DC power supply 3b rather than the power supplied from the AC power supply 3a. On the other hand, the brightness of the light source 2 becomes darker and the power consumption is suppressed. Therefore, for example, even when the AC power supply 3a is in an emergency where a power failure occurs and the power supply switching unit 3c switches the power supply source from the AC power supply 3a to the DC power supply 3b, the brightness of the light source 2 is automatically reduced to reduce power consumption. Can be suppressed. Thereby, the power consumption of DC power supply 3b, such as a storage battery, can be suppressed and the light source 2 can be lighted for a long time.

Next, the abnormality detection control of the lighting device will be described with reference to FIG. FIG. 5 is a flowchart of the abnormality detection control of the lighting device according to Embodiment 1. Next, the abnormality detection control will be described with reference to FIG. In step S31, the control part 42 acquires the determination result of the power supply determination part 41 similarly to step S22, and determines whether the electric power input into the input terminal 50 is alternating current. If it is determined that the current is AC, the process proceeds to step S32. If it is determined that the current is not AC, that is, it is DC, the abnormality detection control is terminated. In step S32, the control unit 42 acquires the voltage across the resistor 14c. After obtaining the voltage across the resistor 14c, the process proceeds to step S33. In step S33, the control unit 42 outputs the output voltage value V _O to the light source 2 based on the voltage across the resistor 14c in advance in the storage unit 43. It is determined whether it is higher than the voltage value V _omax , that is, whether the condition of V _O > V _omax is satisfied. If it is determined that the condition of V _O > V _omax is satisfied, the process proceeds to step S35, and if it is determined that the condition is not satisfied, the process proceeds to step S34. In step S34, the control unit 42 determines whether the output voltage value V _O to the light source 2 is lower than the output lower limit voltage value V _omin stored in the storage unit 43 based on the voltage across the resistor 14c, that is, V _O < It is determined whether or _not the condition of V _omin is satisfied. If it is determined that the condition of V _O <V _omin is satisfied, the process proceeds to step S35, and if it is determined that the condition is not satisfied, the process returns to step S31. In step S <b> 35, the control unit 42 performs control to stop the output of power to the light source 2. Specifically, the constant current control is terminated and the switching elements 22 and 31 are controlled so as to be always kept off, thereby stopping the operations of the step-up chopper circuit 20 and the step-down chopper circuit 30. After stopping the output of power to the light source 2 in step S35, the abnormality detection control is terminated.

Note that the boost target voltage value V _bm , the output upper limit voltage value V _omax, and the output lower limit voltage value V _omin are the light sources when the AC output target current value I _oma is supplied to the light source 2 used in the lighting fixture 100. relationship between the output voltage value _{V oma} to _2, the relationship of _V omin _{<V oma} <V _omax relationships and _V oma _{<V bm} are set to true, respectively.

As described above, in the abnormality detection control, the step-up chopper circuit 20 and the step-down chopper circuit 30 are controlled based on the flowchart of FIG. When an abnormality occurs in the light source 2 such as a short circuit or disconnection of the light emitting element, the value of the internal resistance of the light source 2 changes. Due to the change in the internal resistance of the light source 2, the voltage at both ends of the resistor 14c when the output target current value I _oma at the time of alternating current is output by constant current control changes. Therefore, when an abnormality occurs in the light source 2, both ends of the resistor 14c Based on the voltage change, the output of power to the light source 2 can be stopped immediately. For this reason, it is possible to avoid the situation where the output of power to the light source 2 in which an abnormality has occurred continues with the abnormality detection control.

Each set value stored in the storage unit 43 is set in advance in the manufacturing stage of the lighting device 1, and each set value corresponding to the light source 2 used by being connected to the lighting device 1 is stored in the storage unit 43. Has been written. That is, the boost target voltage value V _bm corresponding to the light source 2 to be used, the AC output target current value I _oma , the DC output target current value I _omd , the output upper limit voltage value V _omax, and the output lower limit voltage value V _omin is determined at the manufacturing stage of the lighting device 1, and these are stored in the storage unit 43. The storage unit 43 is configured by a non-volatile memory, and includes a boost target voltage value V _bm , an AC output target current value I _oma , a DC output target current value I _omd, and an output upper limit voltage value V _omax . The output lower limit voltage value V _omin is determined by being written in the nonvolatile memory. Of the setting values stored in the storage unit 43, the setting value relating to the constant lighting is not limited to the manufacturing stage, but the installation company installs the lighting device 1 or uses the type of light source used when the lighting device 1 is installed. The set value may be stored in the storage unit 43 according to the above. In the first embodiment, the set value relating to the constant lighting corresponds to the AC output target current value I _oma , the output upper limit voltage value V _omax, and the output lower limit voltage value V _omin .

Specifically, writing to the storage unit 43 will be described. For example, the range of the capability that the lighting device 1 can output is that the output current is 250 mA to 500 mA, the output voltage is 50 V to 200 V, and the output power is 25 W to 100 W. To do. In such a lighting device 1, the current for generating the rated current and the illuminance determined by the Building Standards Act, that is, the output target current value I _oma during AC and the output target current value I _omd during DC are within the range of 250 mA to 500 mA. The light source satisfying the ranges of 50V to 200V and each power value of 25W to 100W when the AC output target current value I _oma and the DC output target current value I _omd are used is used. Be a candidate. The alternating current output target current value I _oma and the direct current output target current value I _omd corresponding to any one of the light sources that are candidates for use are written in the storage unit 43, whereby the lighting device 1 outputs the alternating current. A target current value I _oma and a direct current output target current value I _omd are determined. Further, the boost target voltage value V _bm , the output upper limit voltage value V _omax, and the output lower limit voltage value V _omin are related to the AC output target current value I _oma or the DC output target current value I _omd as described above. _Therefore , it is written and determined in the storage unit 43 according to the already determined AC output target current value I _oma or the DC output target current value I _omd . In addition, since the rated current and the current for generating the illuminance determined by the Building Standards Act often take different values depending on the light source, the AC output target current value I _oma or the DC output target current value I _When either one of _omd is determined, the other current value may be determined based on the already determined current value. Note that the range of the capability that can be output by the lighting device 1 is determined by the performance of electronic components constituting the lighting device 1 such as the withstand voltage value of the capacitor 11.

  Since the constant current control and the abnormality detection control are performed based on the set values stored in the storage unit 43 as described above, the lighting device 1 having the circuit configuration according to the first embodiment is stored in the storage unit 43. By changing the set value, it can be used as a lighting device that lights light sources having different performances. For this reason, a platform board, which is a general-purpose mounting board, can be created by mounting the lighting circuit from the input terminal 50 to the output terminal 60 of the lighting device according to the first embodiment on one mounting board. The lighting device corresponding to various light sources can be manufactured only by changing the setting value stored in the unit 43 according to the light source to be used, and the process for developing and designing the lighting device for each light source to be used can be reduced. it can.

  Further, the lighting device of the first embodiment turns on the light source when the power input to the input terminal 50 is alternating current, turns on the light source when the power input to the input terminal 50 is direct current, and the light source. Since all the abnormalities are detected by the same circuit, the number of parts can be reduced, and the lighting device can be downsized.

  Since there is a possibility that an inrush current is generated in the lighting device 1, an inrush current countermeasure circuit may be provided between the input terminal 50 and the rectifier circuit 10 in order to prevent the inrush current.

  Further, the power source determination unit 41 and the power source switching unit 3c are configured to be communicable. When the power source switching unit 3c detects the stop of the AC power source 3a, it transmits a signal to the power source determination unit 41, and the power source determination unit 41 receives the signal. In this case, the power input to the input terminal 50 may be determined to be direct current, and when the signal is not received, the power input to the input terminal 50 may be determined to be alternating current.

  In addition, the lighting device according to the first embodiment has been described with respect to a so-called fixed output type lighting device in which the lighting state during normal lighting is set to a predetermined brightness. However, a dimming control signal (dimming control signal) is provided from the outside of the lighting device. A so-called continuous dimming type lighting device that performs dimming lighting based on the dimming control signal.

Embodiment 2. FIG.
In the first embodiment, the light source that is connected to the lighting device 1 has been described one, in the second embodiment, a first light source 2a to the rated current value I _r are different, the second light source 2b is connected is, when the power from the AC power supply 3a is supplied, turns on the first light source 2a rated current I _r is high, when the power is supplied from the DC power supply 3b, the second rated current value I _r is low A case where the second light source 2b is turned on will be described.

FIG. 6 is a circuit diagram showing a power supply unit and a lighting fixture according to the second embodiment. The luminaire 100a of the second embodiment is newly provided with a first light source 2a and a second light source 2b as compared with the luminaire 100 of the first embodiment. The rated current value I _r1 of the first light source 2a is set to a value higher than the rated current value I _r2 of the second light source 2b.

  In addition, the lighting device 1b of the second embodiment is connected to the first output terminal 60a connected to the first light source 2a and the second light source 2b, as compared to the lighting device 1 of the first embodiment. A second output terminal 60b and an output switching unit 16 for switching whether the output of the power conversion circuit 13 is supplied to the first output terminal 60a or the second output terminal 60b. Although not shown, the output switching unit 16 is connected to the control circuit 40 and is controlled by the control unit 43. In addition, about the other structure of the lighting device 1b of Embodiment 2, it is the same as what was shown with the lighting device 1 of Embodiment 1. FIG.

Further, the AC output target current value I _oma in the second embodiment is set to the rated current value I _r1 of the first light source 2a, and the DC output target current value I _omd is the _rating of the second light source 2b. The current value I _r2 is set.

  FIG. 7 is a flowchart of control during constant current control of the step-down chopper circuit 30 according to the second embodiment. The flowchart of the control of the AC chopper circuit 30 at the time of constant current control in the second embodiment is compared with the flowchart of the first embodiment when the power input to the input terminal 50 is determined to be AC in step S22. The process of step S25 is added during step S23, and the process of step S26 is added between step S24 when the power input from the input terminal 50 is determined to be direct current in step S22. Since the process of step S21-step S24 is the same as the process shown in Embodiment 1, it abbreviate | omits detailed description.

In step S <b> 21, the control unit 42 acquires the voltage across the current detection resistor 35. Next, it progresses to step S22, and the control part 42 judges whether the electric power input into the input terminal 50 is alternating current in step S22. When it is determined in step S22 that the electric power input to the input terminal 50 is alternating current, the process proceeds to step S25, and in step S25, the control unit 43 sends the output of the power conversion circuit 13 to the first output terminal 60a. The output switching unit 16 is controlled so as to be supplied. After the control of the output switching unit 16, the process proceeds to step S23, where the control unit 42 controls the step-down chopper circuit 30 so that the output current _IO to the light source becomes equal to the output target current value I _oma at the time of alternating current. After controlling the output switching unit 16 in step S23, the process returns to step S21 again. If it is determined in step S22 that the power input to the input terminal 50 is a direct current, the process proceeds to step S24, where the control unit 42 converts the output current _IO to the light source to the output target current value I _oma during alternating current. The step-down chopper circuit 30 is controlled to be equal. After controlling the current conversion circuit 13 in step S24, the process proceeds to step S26, and the control unit 42 controls the output switching unit 16 so as to supply the output of the power conversion circuit 13 to the second output terminal 60b. . After the control of the output switching unit 16, the process returns to step S21 again. In addition, regarding the flowchart of the control at the time of constant current control of the step-up chopper circuit 20 according to the second embodiment and the flowchart of the abnormality detection control of the lighting device according to the second embodiment, the control shown in the first embodiment and the flowchart respectively. It is the same.

Thus, as in the lighting device 1b of the second embodiment, the first light source 2a to the rated current value I _r are different, the second light source 2b to be connected, when the power from the AC power supply 3a is supplied It turns on the first light source 2a rated current I _r is high, when the power from the DC power supply 3b is supplied, and configured to light up the rated current value I _r is the lower second light source 2b Also good. Even in this case, the same effect as in the first embodiment can be obtained.

If it is determined in step S22 that the electric power input to the input terminal 50 is alternating current, the output switching unit 16 is controlled to switch the output current _IO to the light source to the output target current during alternating current. The step-down chopper circuit 30 is controlled to be equal to the value I _oma . If it is determined in step S22 that the power input to the input terminal 50 is DC, the step-down chopper circuit 30 is controlled so that the output current _IO to the light source becomes equal to the DC output target current value _Iomd. Then, the switching control of the output switching unit 16 is performed. Therefore, so as not to flow a current of alternating current high when the output target current value I _oma than the rated current value I _r2 to the second light source 2b, the control unit 42 controls.

DESCRIPTION OF SYMBOLS 1 lighting device, 1a lighting device, 1b lighting device, 2 light source, 2a 1st light source, 2b 2nd light source, 3 power supply part, 3a alternating current power supply, 3b direct current power supply, 3c power supply switching part, 10 rectifier circuit, 11 capacitor | condenser 12 rectified voltage detection circuit, 12a resistance, 12b resistance, 12c resistance, 13 power conversion circuit, 14 output detection circuit, 14a resistance, 14b resistance, 14c resistance, 15 boost voltage detection circuit, 15a resistance, 15b resistance, 15 c resistor, 16 output switching unit, 20 step-up chopper circuit, 21 inductor, 22 switching element, 23 resistor, 24 diode, 25 capacitor, 30 step-down chopper circuit, 31 switching element, 32 diode, 33 inductor, 34 capacitor, 35 current detection Resistance, 40 control circuit, 41 power supply Parts, 42 control unit, 43 storage unit, 50 an input terminal, 60 an output terminal, 60a first output terminal, 60b a second output terminal, 100 luminaires

Claims (9)

An input terminal connected to the power source;
A rectifier circuit that rectifies the power input from the input terminal into DC power;
A power converter circuit for converting the power rectified by the rectifier circuit;
An output terminal to which a light source to which power converted by the power conversion circuit is supplied is connected;
A power determination unit that determines whether the power input from the input terminal is direct current or alternating current;
When the power determination unit determines that the power input from the input terminal is DC, the power input from the input terminal is determined via the output terminal than when the power input is determined to be AC. A control unit that controls the power conversion circuit so that the value of the current flowing to the light source is low;
Lighting device with A circuit for detecting a rectified voltage for detecting a voltage rectified by the rectifier circuit;
The lighting device according to claim 1, wherein the power determination unit determines whether the power input from the input terminal is a direct current or an alternating current based on an output voltage of the rectified voltage detection circuit. A storage unit that stores a preset output target current value at the time of alternating current and a direct current output target current value that is set lower than the output target value at the time of alternating current;
A current detection circuit for detecting the value of the current supplied to the light source;
When the power determining unit determines that the power input from the input terminal is DC, the control unit determines that the value of the current supplied to the light source is the DC output target value, from the input terminal. When it is determined that the input power is alternating current, the power conversion circuit based on the output voltage of the current detection circuit so that the value of the current supplied to the light source becomes the output target value during alternating current The lighting device according to claim 1, wherein the lighting device is controlled. The lighting device according to claim 1, wherein the power conversion circuit includes a step-up chopper circuit and a step-down chopper circuit. An output voltage detection circuit for detecting a value of a voltage supplied to the light source;
The storage unit stores a preset output upper limit voltage value and an output lower limit voltage value lower than the output upper limit voltage value,
When the power determination unit determines that the power input from the input terminal is alternating current, the control unit determines that the voltage output from the output terminal is based on the detection value of the output voltage detection circuit. It is determined whether a condition lower than an upper limit voltage value and higher than the output lower limit voltage value is satisfied, and when the condition is not satisfied, the power conversion circuit is controlled not to supply power to the light source. The lighting device according to 3 or 4. 6. The lighting device according to claim 3, wherein the alternating current output target current value and the direct current output target current value are set according to the performance of the light source. The storage unit is a nonvolatile memory;
The input terminal, the rectifier circuit, the power conversion circuit, the output terminal, the power supply determination unit, the control unit, and the nonvolatile memory are mounted on a single substrate. The lighting device described. An input terminal connected to the power source;
An output terminal to which a light source is connected;
A lighting circuit that converts the power input from the input terminal and outputs it from the output terminal;
When the power input from the input terminal is AC power, the control circuit that controls the lighting circuit so that the current value output from the output terminal becomes the output target current value during AC,
A non-volatile memory that stores the alternating current output target current value, and a platform substrate,
When the direct current output target current value that is lower than the alternating current output target current value is written in the nonvolatile memory, the control circuit is configured such that the power input to the input terminal is alternating current power, It is determined whether the power is DC power, and when the power input from the input terminal is DC power, the lighting circuit is controlled so that the current value output from the output terminal becomes the DC output target current value. A lighting device characterized by. An input terminal connected to a power source, an output terminal to which a light source is connected, a lighting circuit that converts power input from the input terminal and outputs it from the output terminal, and power input from the input terminal is AC power In this case, the lighting circuit is controlled so that the current value output from the output terminal becomes the output target current value during AC, and when the power input from the input terminal is DC power, the current value output from the output terminal Is a control circuit that controls the lighting circuit so that it becomes a DC output target current value that is lower than the AC output target current value, and the AC output target current value and the DC output target current value are A non-volatile memory for storing the platform substrate,
Characteristics of an electronic component having the AC output target current value and the DC output target current value different from each other, and each of the AC output target current value and the DC output target current value forming the lighting circuit A plurality of types of light sources included in the output current range of the lighting circuit determined by a value are candidates for use of the light sources connected to the output terminal, and the one of the plurality of types of light sources A lighting device that is determined to use the platform substrate as a light source having the DC output target current value written in the nonvolatile memory by writing a DC output target current value in the nonvolatile memory.

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