JPH0673899U - Lighting device for discharge lamp - Google Patents

Abstract

(57) [Summary] [Purpose] The harmonic content of the input current of most discharge lamp inverters currently installed is IEC standard 1000.
-2-2 Since the class C limit value is not satisfied, it is an object of the present invention to propose a device that satisfies the above limit value at a simple and low cost. [Configuration] A configuration in which a discharge lamp 20 W choke is inserted into one end of an existing 200 V 100 W or less inverter power supply terminal.

Description

[Detailed Description of the Invention] Although the use of inverters for ballasts for discharge lamps is becoming active, harmonic components are generated in the input current due to the charging current of the smoothing capacitor. Since multiple discharge lamp inverters (hereinafter called inverters) are used at the same time, the harmonic distortion increases significantly.

 Harmonic distortion causes damage to other devices, so it is necessary to improve the distortion.

 The present invention satisfies IEC standard 1000-2-2 class C.

 Most of the installed inverters in the past had a problem that they were not within this standard, but this is an improvement, and we will also propose a low-cost design for future development products.

FIG. 1 shows waveforms of a power supply voltage E ₀ and an input current I _{1 of} 200V for a conventional inverter FL (R) 40W2 lamp.

Table 1 shows the power harmonic distortion generation limit value of IEC1000-2-2 class C, and Table 2 shows the analysis value of the input current waveform of FIG.

The conventional inverter does not include the 5th, 7th, and 9th harmonic values.

FIG. 2 shows a 200V inverter 1 for two FL (R) 40W lamps and a commercially available 20W choke 2 for a fluorescent lamp inserted at one end of a power source.

FIG. 3 shows the waveforms of the power supply voltage E ₀ and the input current I ₁ of FIG. Table 3 shows the analysis values of the input current waveform of FIG.

As a result, the limit value of IEC1000-2-2 class C is satisfied.

 The active smoothing filters that are currently being investigated by each company can improve harmonic distortion, but the cost is significantly higher than that of a 20 W choke, and it cannot be applied to conventional inverters.

 The present invention satisfies the IEC1000-2-2 class C of harmonic distortion by a simple work of installing a commercially available 20W choke at one end of the power source of the 200V inverter which has been conventionally installed. In addition, low cost design can be achieved by using it for future design.

 For a 200V, 40W single lamp, a choke having an impedance of 20w or less can be sufficiently improved, but it goes without saying that a 20W choke may be used.

 The impedance of a commercially available 20 W choke is usually about 170 to 210 (Ω).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an input waveform of FL (R) 40W 2 lamp 200V. Figure 2 shows an inverter with a choke connected. FIG. 3 is the input waveform of FIG. E ₀ : Power supply voltage I
₁ : Input current 1 : FL (R) 40W 200V inverter for 2 lamps 2: 20W choke for fluorescent lamps

Claims (1)

[Scope of utility model registration request] A discharge lamp lighting device in which a 20 W fluorescent lamp choke is inserted into one end of a power terminal of a discharge lamp inverter having a power supply voltage of 200 V and an output of 100 W or less.