JPH05303997A - Dc lighting of inverter type lighting circuit - Google Patents

Abstract

PURPOSE:To provide a large lighting output and reduce imterference to a radio by shaping the output of an inverter lighting circuit by a rectifier to geive a direct current, and supplying this current to a lamp through a smoothing circuit. CONSTITUTION:A rectifier 2 is connected to an inverter lighting circuit 1, and the output of the lighting circuit 1 is shaped to give a DC voltage. A smoothing coil 8 is connected in the rear of the rectifier 2 through a smoothing capacitor 9 to suppress a sudden release of charge from the smoothing capacitor 9. The resulting direct current is supplied to a lamp 4. Since the direct current having less AC frequency component can be provided, the flicker of the lamp 4 is eliminated, and by the amount that the flicker is eliminated, a larger lighting output can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [1] Purpose of the invention (1) Industrial field of application Lighting field (2) Conventional technology Inverter type lighting circuits may have a large amount of electrode wear and radio noise. Sometimes it was too big. (3) Problem to be Solved by the Invention An element having an impedance except that the output of an inverter type lighting circuit is rectified by a rectifier, or a constant current circuit made of a stable resistor or a semiconductor is independently used for the inverter circuit, Or, after connecting the circuit, rectify using a rectifier to obtain a DC current with a small AC frequency component superposition.
By supplying this to the fluorescent lamp, the blinking of the lamp is eliminated and flicker disappears, and a large light output is obtained.
Moreover, since the output of the inverter is converted to DC, radio noise is also reduced. [2] Configuration of the invention (1) Means for solving the problem By eliminating blinking of the inverter lighting circuit, flicker disappears as compared with the case of using the conventional inverter system.
In order to obtain a large light output, for example, when an inverter type lighting circuit is used, the output of this inverter lighting circuit is rectified by a rectifier to obtain a DC voltage, and a DC current is obtained through a smoothing circuit to obtain a lamp. Supply to. (2) The negative characteristics of the discharge of the working lamp can be dealt with by the capacitor ballast in the inverter type lighting circuit, the coil and the magnetic leakage transformer, and the impedance connected to this when the inverter is used. It is possible to deal with it by using an element or a circuit that has The kick voltage is obtained by interrupting the current flowing through the smoothing coil 3 in FIG. 1 by the starter. (3) Embodiment FIG. 3 shows an example of the output voltage waveform of the inverter lighting circuit. FIG. 2 shows the lamp current. It can be seen that the lamp current is a direct current with less superposition of harmonic components. [3] Effect of the invention The lamp current does not blink and the lamp current is
Since the direct current as shown in FIG. 2 is used, a larger optical output can be obtained as compared with the case where the conventional inverter lighting circuit is used, and the radio noise is also reduced. Furthermore, since it is an inverter system, it is possible to use a compact and lightweight capacitor / ballast, a coil, and a magnetic leakage transformer.

BRIEF DESCRIPTION OF THE DRAWINGS (FIG. 1) This is one of the circuit diagrams used in the present invention. 1-shows an example of an inverter lighting circuit. 2-Bridge 3-Smoothing capacitor 4-Lamp 5-Starting auxiliary conductor or fluorescent lamp fixture (Fig. 2) The oscilloscope waveform represents the lamp current. (FIG. 3) An oscillographic waveform represents an example of an output voltage waveform of the inverter lighting circuit. (FIG. 4) This is one of the circuit diagrams used in the present invention. 1-shows an example of an inverter lighting circuit. 2-Double voltage rectifier 3-Starter 4-Lamp 5-Starting auxiliary conductor or fluorescent lamp fixture 6-Noise prevention capacitor 7-Integration circuit 8-Smoothing coil 9-Smoothing capacitor

Claims (1)

[Claims] [1] In order to realize direct current lighting of a preheat start type fluorescent lamp using an inverter, "however,
Excluding the spot system ”As shown in Figure 1, connect a" rectifier "to the inverter lighting circuit, or connect the inverter circuit to the inverter circuit.
An element with impedance, or a stable current or a transistor, except for using a constant current circuit alone. Connect the circuits and then use a "rectifier" to obtain the DC voltage. [2] After claim 1, in order to obtain a direct current with a small superposition of AC frequency components, after this "rectifier",
First, a smoothing capacitor is connected, and then a smoothing coil is connected, so that sudden charge discharge from the smoothing capacitor can be suppressed. And
This direct current is supplied to the lamp. [3] In Claims 1 and 2, a small capacity capacitor is provided along the lamp between the starting auxiliary conductor or between the fluorescent lamp fixture and the power source as an aid for smoothly performing the repolarization of the lamp. Use to connect.