JP2007110881A - Led illumination lighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide LED illumination lighting equipment which mitigates an inrush current generated when the power of LED illumination is turned on, and normally lights the LED illumination. <P>SOLUTION: In order to connect so that a current may join naturally primarily from a battery and secondarily from a system power supply, the battery is charged by the electric power of solar power generation. Then its potential is set to be slightly higher than a system voltage, and the system power supply is composed of a rectified composition. Moreover, in order to mitigate the inrush current, a delay switch which controls lighting, and a soft switching system which limits the current are used during a smoothing capacitor is precharged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply means and a method for an illumination apparatus using an LED (light emitting diode) as a light source.

  Currently, there are a wide variety of industrial products that use white LEDs or daylight color LEDs for lighting, including flashlights, automobile interior lights, nighttime crime prevention and disaster prevention lights.

  These lighting devices utilize the features of LEDs such as power saving, high brightness, long life and little maintenance, and are expected to be used in a wider range in the future.

  However, since the amount of light emitted by one LED is limited, it is necessary to increase the number of LEDs in a large room that requires more brightness, such as a distribution warehouse or a large store.

  Also usually

Most of the facilities illustrated in (1) have a rated voltage of 100V (volts) or 200V AC power (system power), and it is necessary to convert them to a voltage of about 3.5V at which the LED operates.

  On the other hand, since LEDs consume less power, they can emit light enough with the electric energy obtained by solar power generation, and can be turned on day and night without using commercial power by storing this solar energy in a battery. It is possible.

Problems to be solved by the invention

  When commercial power is used as a power source and this LED is rectified to turn on the LED, an inrush current flows at the moment when the switch is turned on, which may damage the LED.

  In addition, when electric energy from solar power generation is used as a power source for LED lighting, an auxiliary power source other than stored solar energy is indispensable because there is a limit to the battery that can be prepared.

  Therefore, it is necessary not only to use solar energy alone, but also to combine with other power generation facilities and link with grid power.

  When photovoltaic power and grid power are shared, LEDs operate with either alternating current or direct current, but many other electrical devices are designed to operate with alternating current. Converting it and using it as AC power allows you to use the equipment as it is and has a wider range of applications.

  However, about 10% conversion loss (inverter loss) occurs at this time, and the power generated by sunlight is consumed wastefully before use.

  In addition, when using DC, the system power is AD converted, and it is always monitored whether the photovoltaic power is below the reference value, and if it is below, it can be switched to the grid power. In this case, a comparison circuit is required. In addition, LED lighting has a reaction speed that can be turned ON / OFF at 1/1000 second intervals, so there is a possibility that the lighting will blink when switching.

Means for solving the problem

  The present invention reduces the sudden inrush current that flows when the initial power is turned on when the system power is rectified and the LED lighting is turned on.

  As shown in Fig. 1, the rectified grid power passes through the capacitor pre-charging resistor and charges the smoothing capacitor.

  The smoothing capacitor for this input voltage stabilizes the output voltage as the capacitance increases, but the inrush power increases.

  Therefore, when the power is turned on, the smoothing capacitor is precharged for about 0.5 to 1.0 seconds. The CPU always monitors whether it is charged, and sends a control signal to the delay switch that delays the lighting of the LED. When the CPU detects that this is the case, the LED is turned on with current limiting.

  In addition, as shown in the main system of FIG. 2, the current flowing from the photovoltaic power system is charged while protecting the battery from being overcharged, sharing the negative terminal, the line is protected and controlled, and the direct current is 100V ~ Outputs a voltage of 270V.

  The main power source for LED lighting is

Of solar power,

It is appropriate to install the grid power as an auxiliary power source as described in.

  As a method of synthesizing the two power sources of photovoltaic power and system power, connect them by devising the set values of both reference voltages in the circuit diagram shown in Fig. 3 (the solar side is set slightly higher).

The invention's effect

  The smoothing capacitor pre-charging method shown in Fig. 1 reduces the inrush current that occurs when the LED lighting is turned on, and enables the LED lighting to light up normally.

  In addition, the soft switching circuit in FIG.

Inrush current can be mitigated in the same way.

  A DC power source that rectifies the system power like this circuit is used as an auxiliary, and it is lit mainly by the supply of photovoltaic power. When the potential decreases to the reference voltage for solar power generation due to sunshine hours, only the shortage automatically flows from the system power supply, and when the reference voltage is exceeded again due to sunshine recovery, the lighting is turned on with only the solar power.

  The lighting of LED lighting by the circuit of Fig. 1 is effective for equipment when replacing existing fluorescent lighting with LED lighting.

  The lighting of LED lighting by the circuits of Fig. 2 and Fig. 3 is effective for equipment at a new location in line with the concept of a type that mainly uses a photovoltaic power generation system.

  The target LED lighting here refers to indoor and outdoor lighting covering a large area such as a warehouse or mass retailer. For example, the conventional lighting with a fluorescent lamp or a mercury lamp is replaced with a white LED. It assumes a scene.

  There are quite a lot of industries that require lighting over a wide range for a long time. Conventionally, lighting that has been lit regardless of day and night using a large amount of electric energy has led to the rise of significant electric energy and greenhouse gas emissions. Since the reduction is realized, the industrial applicability is very high.

  There is an unlimited demand for LED lighting that ensures brightness and achieves energy saving and ecology, such as distribution warehouses, large stores, large parking lots, commercial facilities, and high-rise buildings. It is an invention.

LED lighting device lighting circuit 1 Main system block diagram LED lighting device lighting circuit 2

Claims (2)

  A device that stably operates DC equipment by combining the currents generated by two or more energy sources at a natural inflow rate.   A circuit that mitigates the shock wave of the initial inrush power that occurs when lighting LED lighting using commercial power sources or private power generators, etc., and enables the lighting to operate normally.

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