JPH07183084A - Method for conserving energy of inverter fluorescent lamp - Google Patents

Abstract

PURPOSE:To decrease the power consumed by an inverter fluorescent lamp, without decreasing sensible illumination. CONSTITUTION:An inverter stabilizer 2 is interposed between the power lines of an inverter fluorescent lamp 1 and a controller 3 for lamp illumination is disposed on the input-line side of the stabilizer 2. The lamp illumination controller 3 cyclically fluctuates the voltage inputs to the inverter stabilizer 2. The afterimage phenomenon of the eyes is utilized to reduce the power consumption of the inverter fluorescent lamp 1 without decreasing sensible illumination. The system is used as a demand-restraint system by enlargement of a voltage drop range, in which case the lamp illumination controller 3 is disposed under the control of a demand control unit 5. The power consumed by the inverter fluorescent lamp is thus reduced without decreasing sensible illumination and an air-conditioning load is decreased indirectly, so that the target power to be controlled is easily maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy saving method for an inverter fluorescent lamp, which cyclically changes the input voltage to the inverter fluorescent lamp.

[0002]

2. Description of the Related Art Inverter ballasts have been developed to save power for inverter fluorescent lamps. This inverter ballast, which feeds back the detected current value at the time of load to the oscillation circuit of the inverter circuit and drives at a higher frequency than before, has a stable light emission characteristic with less heat generation and no flicker. This flicker is a phenomenon that a person feels for light that fluctuates at a frequency below a certain value, and this frequency is called the critical crossing number.

[0003]

The demand control device temporarily shuts off the motor of the fan or the like, but cannot shut off the lighting because it interferes with the work. The peak load in summer in the building is during cooling at 2:00 pm, and power saving for lighting is very significant under the basic tariff system of the actual amount system. The present invention cyclically fluctuates the input voltage to the inverter ballast so as not to cause flicker and a reduction in illuminance experienced by the inverter fluorescent lamp, which will be described in detail below.

[0004]

[Means for solving the problem] An inverter ballast is attached to the power line of the inverter fluorescent lamp group, and a controller for lighting the lamp is arranged on the power line side in front of the inverter ballast, and the input voltage to the inverter ballast is controlled by this controller. It fluctuates to click. The cyclic period is a frequency above the critical crossing number that does not cause flicker. A demand control device that monitors the demand value for each time period may manage this electric lighting controller and maintain the management target power through cyclic fluctuations in the input voltage.

[0005]

FIG. 2 shows the relationship between the power consumption and the illuminance with respect to the input voltage to the inverter fluorescent lamp. If the voltage is lowered from 100 V to 70 V, the illuminance will drop by about 100 lux, but the power consumption will be saved by about 30%. The output voltage from the electric lighting controller fluctuates periodically within the range of 100 to 70 volts as shown in FIG. Since the frequency is above the critical crossing number (within the range of the afterimage time of the eye), the flicker of the fluorescent lamp is not felt. The adverse effect on the inverter fluorescent lamp due to the fluctuation of the output voltage of the lighting controller is
It is solved by the inverter ballast arranged between each power line. If the step-down range is further expanded to about 50 volts, a slight reduction in illuminance due to sensation cannot be avoided, but demand control with a demand control device is possible.

[0006]

[Example] 10 between power lines of a plurality of inverter fluorescent lamps 1
With an inverter ballast 2 for 0 to 200 volts,
On the upstream side, the electric lighting controller 3 and the lighting distribution board 4 are sequentially arranged. The inverter ballast 2 detects a current at the time of load and feeds it back to the oscillator of the inverter circuit, and is characterized by saving power and low heat loss. A decrease in the surface temperature of fluorescent lamps and the ballast itself leads to indirect energy conservation in indoor air conditioning. The inverter ballast 2 stably lights the fluorescent lamp even if the input voltage fluctuates. The electric lighting controller 3 cyclically changes the output voltage, and an inverter for a lighting circuit is adopted. The step-down range and cycle are set as appropriate in consideration of the lighting location and energy saving amount. The cycle is more than the critical crossing number, preferably 50 hertz or more, but it depends on the afterimage time of the eye and the indoor environment. The electric lighting controller 3 may be arranged under the control of the demand control device 5. The demand control device 5 internally calculates the amount of power used for the time period, the total amount of power consumed for the day, the daily load factor, etc. based on the power pulse, and continuously predicts the maximum power for each time period. When there is a risk of exceeding the electric power, the inverter for the lighting circuit is controlled to suppress the peak electric power.

[0007]

In summary, according to the present invention, the inverter ballast 2 is attached to the power line of the inverter fluorescent lamp group, and the controller 3 for lighting the lamp is arranged on the power line side in front of the inverter ballast, and the inverter ballast 2 is connected by this controller. Since the input voltage fluctuates cyclically, it is possible to save energy without reducing the sensation of illuminance due to the afterimage phenomenon of the eyes. Further, the electric lighting controller 3 may be arranged under the control of the demand control device 5 to select a step-down range to function as a demand suppression system, thereby breaking through the limit of the conventional demand system that assumes load shedding. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of a system circuit.

FIG. 2 is a graph showing a power consumption curve and an illuminance curve with respect to an input voltage of an inverter fluorescent lamp.

FIG. 3 is a cyclic input voltage curve to an inverter ballast.

[Explanation of symbols] 1 inverter fluorescent lamp 2 inverter ballast 3 controller for lighting of electric lamp 4 distribution panel for lighting 5 demand control device

Claims (3)

[Claims] 1. An inverter ballast 2 is attached to a power line of an inverter fluorescent lamp group, and an electric lighting controller 3 is arranged on the power line side in front of the inverter ballast, and an input voltage to the inverter ballast 2 is cyclically arranged by this controller. The energy saving method of the inverter fluorescent lamp that fluctuates rapidly. 2. The energy saving method for an inverter fluorescent lamp according to claim 1, wherein an inverter for a lighting circuit is adopted as the controller for lighting the electric lamp. 3. A cyclic voltage having a frequency equal to or higher than a critical crossing number that does not cause flicker, in which an inverter ballast is attached to the power line of the inverter fluorescent lamp group, and an inverter for a lighting circuit is arranged on the power line side in front of the inverter ballast. The energy saving method of the inverter fluorescent lamp that supplies this to the inverter ballast 2.