JP2011217555A - Power supply system and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system which does not carry out such wasteful power conversion such as converting a DC power created by photovoltaic power generation into an AC power and further converting the AC power into the DC power for power supply to an LED lighting appliance, thereby efficiently utilizing photovoltaic power and compensating power deficiency with a power from a commercial DC power supply when photovoltaic power is not sufficient as power to be supplied to the LED lighting appliance.SOLUTION: The power supply system 100 is equipped with: a first DC power supply device 110 which receives an incoming DC voltage from a solar battery panel 1101, converts the incoming DC voltage in magnitude into a first DC voltage to output it, and can change the magnitude of the first DC voltage; a second DC power supply device 120 which is connected in parallel to the first DC power supply device 110, receives an incoming commercial AC voltage, converts it into a second DC voltage to output it, and can change the magnitude of the second DC voltage through control; and a controller 130 which controls an output power from the first DC power supply device 110 by adjusting the magnitudes of the first DC voltage and the second DC voltage through control over the first DC power supply device 110 and the second DC power supply device 120.

Description

  The present invention relates to a DC power supply device and a lighting system for supplying power to a lighting fixture.

  In the prior art, DC power from the solar panel is converted into a commercial AC power supply by a power conditioner, and the power is sent out in cooperation with the power supply system. On the other hand, when the LED lighting system uses a commercial AC power source as a power source, the commercial AC power source is converted into a direct current and supplied to the LED. In this case, the system using solar power generation and the LED lighting system are operating independently.

  There is a technique for charging a storage battery while supplying power to a load by solar power generation, and supplying the power of the storage battery to the load when power generation cannot be performed by solar power generation (for example, Patent Document 1).

  In addition, there is a technique for determining whether the voltage on the side that supplies power to the load is a commercial power source (AC 100 V or more and 240 V or less) or a solar power generation unit (for example, Patent Document 2).

JP 2004-208423 A JP 2006-303165 A

  The power generated by solar power is converted into alternating current by a power conditioner and supplied to a power supply system. The LED lighting system receives supply of commercial AC power from a power supply system, converts this AC to DC, and turns on the LED. In this method, the LED lighting system uses the supplied AC power supply without distinguishing whether the supplied power is “solar-generated power” or “solar-generated power”. ing. Therefore, power generation installed in the same building and power consumption are irrelevant.

  In addition, in the above case, the DC power source of photovoltaic power generation is once converted to AC and converted from AC to DC in the LED lighting apparatus, although it is finally fed with direct current to the LED. Conversion loss was produced.

  The present invention includes a power supply system device that connects both power supply means for supplying power generated by photovoltaic power generation and commercial AC power supply in parallel, thereby maximizing photovoltaic power generation without the useless conversion loss. It is an object of the present invention to provide a power supply system apparatus that assists the shortage with a commercial power source when the required power cannot be satisfied by solar power generation alone.

The power supply system apparatus of this invention
The DC voltage output from the solar cell is input to convert the magnitude of the DC voltage, the first DC voltage that is the converted voltage is output, and the magnitude of the first DC voltage is received by control. A changeable first DC power supply device;
A second DC power supply device connected in parallel with the first DC power supply device, which receives a commercial AC voltage, converts it to a DC voltage, outputs a second DC voltage that is the converted voltage, and controls it. A second DC power supply device capable of changing the magnitude of the second DC voltage by receiving,
By adjusting the magnitudes of the first DC voltage and the second DC voltage through control on the first DC power supply device and the second DC power supply device, the output output from the first DC power supply device And a control device for controlling electric power.

  According to the power supply system apparatus of the present invention, both the power source for supplying the power generated by the solar power and the power source based on the commercial AC power source are connected in parallel. The power of solar power generation can be utilized to the maximum without any problem, and the shortage can be compensated for by a commercial AC power source when the required power cannot be covered only by solar power generation.

1 is a configuration diagram of an LED illumination system 1010 of Embodiment 1. FIG. 1 is a configuration diagram of a power system apparatus 100 according to a first embodiment. 1 is a configuration diagram of an LED illumination system 1020 of Embodiment 1. FIG.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of an LED illumination system 1010 according to the first embodiment. The LED lighting system 1010 includes a centralized lighting power supply device 100 (hereinafter referred to as a power supply system device 100), an LED lighting device 200-1, and the like.

(Power supply system device 100)
The power supply system device 100 includes a first DC power supply device 110, a second DC power supply device 120, and a control device 130. In the power supply system device 100, the output ends of the first DC power supply device 110 and the second DC power supply device 120 are connected in parallel by a diode OR of a diode 21 and a diode 22. The power supply system device 100 includes current sensors 31 and 32 that detect output currents of the first DC power supply device 110 and the second DC power supply device 120, and a capacitor 40.

(LED lighting equipment)
The direct current output terminal 50 of the power supply system apparatus 100 receives the direct current voltage output from the direct current output terminal 50, and the constant current circuits 210-1, 210-2, 210-3 and LEDs 220-1, 220, which are light sources. -2 and 220-3 are connected to lighting fixtures 200-1, 200-2, and 200-3 that are lit by supplying a constant current.

(First DC power supply device 110)
The first DC power supply device 110 uses the direct current power of solar power generated by the solar panel 1101 installed in the same building as the LED lighting fixtures 200-1, 200-2, 200-3 installed in the building. , Converted to a DC constant voltage appropriate for LED lighting fixtures and output. The first DC power supply device 110 can change the output voltage.

(Second DC power supply device 120)
The second DC power supply device 120 converts the AC voltage from the commercial AC power supply 1201 into a DC constant voltage appropriate for the LED lighting apparatus. The second DC power supply device 120 can change the output voltage.

(Control device 130)
The control device 130 controls the output voltages of the first DC power supply device 110 and the second DC power supply device 120 by using the output current and the output voltage of the first DC power supply device 110 and the second DC power supply device 120 as inputs. By this control, the control device 130 performs control so that the output power from the first DC power supply device 110 is maximized, and supplies an appropriate DC voltage to the LED lighting apparatus 200-1 and the like.

  FIG. 2 is a circuit diagram showing details of each power supply device shown in FIG.

(First DC power supply device 110)
The first DC power supply device 110 is a flyback voltage conversion circuit that inputs a DC voltage of the solar battery panel 1101. As shown in FIG. 2, the first DC power supply device 110 includes a switching element 113, a drive circuit 112 that drives the switching element 113, a transformer 114, a diode 115, and a capacitor 116. The first DC power supply device 110 can change the output voltage (first DC voltage) by varying the on-duty of the switching element 113 with a signal from the control device 130.

(Second DC power supply device 120)
In the step-up chopper circuit 121 of the second DC power supply device 120, the input current from the rectifier circuit 121-1, the inductor 121-2, the switching element 121-3, and the commercial AC power supply 1201 that rectifies the commercial AC power supply 1201 becomes a sine wave. PFC control IC 121-4 that controls switching of switching element 121-3, diode 121-5, and electrolytic capacitor 121-6, and boosts the DC voltage rectified by rectifier circuit 121-1 to a predetermined DC voltage At the same time, it is smoothed by the capacitor 121-6. The DC voltage boosted by the boost chopper circuit 121 is converted into a predetermined DC voltage (second DC voltage) by a flyback voltage conversion circuit having the same configuration as that of the first DC power supply device 110.

  Diodes 21 and 22 are connected in the forward direction to the “+ terminals” at the output ends of the first DC power supply device 110 and the second DC power supply device 120, and the cathode sides of them are made common. In other words, the outputs of the first DC power supply device 110 and the second DC power supply device 120 are connected in parallel by diode OR with the diodes 21 and 22.

(Control device 130)
The control device includes a voltage dividing circuit 131 and the like, a voltage conversion circuit 134 and the like, and a control circuit 136. In the control device 130, the output voltage and output current of the first DC power supply device 110 and the second DC power supply device 120 are divided into voltage dividing circuits 131, 132, 133 (output voltage) and voltage conversion circuits 134, 135 (output current), respectively. Is input through. The control circuit 136 is configured to switch the switching elements 113 of the first DC power supply device 110 and the second DC power supply device 120 based on currents and voltages input from the first DC power supply device 110 and the second DC power supply device 120, respectively. The output voltage of the first DC power supply device 110 and the second DC power supply device 120 is controlled by controlling the on-duty of 123. In this control, control is performed such that the output power from the first DC power supply device 110 is maximized.

  In other words, the power supply system device 100 can make maximum use of the power generated by the solar cell panel 1101 and can use the power from the commercial power source 1201 as a supplement for the shortage, under the control of the control device 130. On the other hand, when the power generation from the solar battery panel 1101 stops at night, the necessary output power is provided only by the second DC power supply device 120 from the commercial AC power supply 1201. In the state where power is generated by the solar cell panel 1101, control is performed so that the maximum power is output to the load side according to the amount of power generation, so the power from the commercial power source 1201 is only the shortage.

(Constant current circuit 210)
The LED lighting apparatus 200 connected to the output terminal of the power supply system device 100 generates a constant current by the constant current circuit 210 based on the voltage supplied from the power supply system device 100, and lights the LED 220 with this constant current. The constant current circuit 210 includes a diode 222, a smoothing electrolytic capacitor 221, a switching element 218, an inductor 216, a diode 217, an electrolytic capacitor 215, and a switching that prevent a failure when a voltage output at a substantially constant voltage is reversely connected. A step-down chopper circuit having a drive circuit 219 for driving the element 218 is provided. The step-down chopper circuit includes a current detection resistor 213. The operational amplifier circuit 212 outputs a difference between the voltage corresponding to the LED current detected from the current detection resistor 213 and the reference voltage V to the control circuit 211. The control circuit 211 controls the drive circuit 219 in accordance with the input from the operation amplification circuit 212. A constant current can be obtained by this feedback control. In this way, the LED lighting apparatus 200 or the like connects the LED 220 or the like as a load, detects the LED current flowing through the LED 220 or the like with the detection resistor 213, and supplies a constant current to the LED 220 or the like by feedback control.
Other circuit systems that operate by inputting a DC power source such as a constant power circuit instead of the constant current circuit may be used, and a circuit suitable for a light source such as an organic EL or a fluorescent lamp in addition to an LED. A scheme can also be used.

  FIG. 3 is a configuration diagram of the LED lighting system 1020 according to the first embodiment. The power supply system device 100 of the LED lighting system 1020 includes constant current circuits 501-1 and 501-2 that input voltages obtained by connecting the output terminals of the first DC power supply device 110 and the second DC power supply device 120 in parallel. LED lighting fixtures 10-1 and the like, LED lighting fixtures 20-1 and the like are connected in series to the output terminals of the current circuits 501-1 and 501-2, respectively.

  100 power supply system apparatus, 110 first DC power supply apparatus, 120 second DC power supply apparatus, 130 control apparatus, 501-1, 501-2 constant current circuit, 1010, 1020 LED lighting system.

Claims (6)

The DC voltage output from the solar cell is input to convert the magnitude of the DC voltage, the first DC voltage that is the converted voltage is output, and the magnitude of the first DC voltage is received by control. A changeable first DC power supply device;
A second DC power supply device connected in parallel with the first DC power supply device, which receives a commercial AC voltage, converts it to a DC voltage, outputs a second DC voltage that is the converted voltage, and controls it. A second DC power supply device capable of changing the magnitude of the second DC voltage by receiving,
By adjusting the magnitudes of the first DC voltage and the second DC voltage through control on the first DC power supply device and the second DC power supply device, the output output from the first DC power supply device A power supply system device comprising a control device for controlling electric power. The controller is
Adjusting the magnitude of at least one of the magnitude of the first DC voltage and the magnitude of the second DC voltage so that the output power output by the first DC power supply device is maximized. The power supply system apparatus according to claim 1. Output portions of the first DC power supply device and the second DC power supply device are:
The power supply system apparatus according to claim 1, wherein the power supply system apparatus is connected in parallel by diode OR connection. The power system device further includes:
The first DC voltage and the second DC voltage that are connected in parallel to the first DC power supply and the second DC power supply and are supplied from the first DC power supply and the second DC power supply. The power supply system apparatus according to claim 1, further comprising: a constant current circuit that generates a constant current based on the generated current and outputs the generated constant current. The power supply system device according to any one of claims 1 to 3,
A lighting system equipped with a light source and a lighting fixture connected to the power supply system device. The power supply system device according to claim 4,
An illumination system comprising: a lighting device that is mounted with a light source and that receives a constant current from the constant current circuit of the power supply system device and lights the light source.

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