JPH0332399U

JPH0332399U -

Info

Publication number: JPH0332399U
Application number: JP9283289U
Authority: JP
Priority date: 1989-08-07
Filing date: 1989-08-07
Publication date: 1991-03-28

Description

[Brief explanation of drawings]

第１図は本考案の一実施例のブロツク構成図、
第２図は本考案の他の実施例のブロツク構成図で
ある。１……商用交流電源、２……全波整流器、４…
…駆動用変圧器、４ａ，４ｃ……駆動巻線、５，
６……スイツチング素子、１０，１１……コンデ
ンサ、１２……インダクタンス素子、１２Ａ……
２次巻線、１３……キヤパシタンス素子、１４，
１５……全波整流用ダイオード、１８，１８´…
…判別回路、３０，３０´……保護回路、３６…
…リセツトスイツチ（リセツト部）、Ｌａ，Ｌａ
１，Ｌａ２……放電灯。 FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 2 is a block diagram of another embodiment of the present invention. 1...Commercial AC power supply, 2...Full wave rectifier, 4...
...Drive transformer, 4a, 4c...Drive winding, 5,
6... Switching element, 10, 11... Capacitor, 12... Inductance element, 12A...
Secondary winding, 13... Capacitance element, 14,
15... Full-wave rectifier diode, 18, 18'...
...Discrimination circuit, 30, 30'...Protection circuit, 36...
...Reset switch (reset part), La, La
1, La2...discharge lamp.

Claims

[Scope of utility model registration request]

In a device that supplies direct current power obtained by full-wave rectification of commercial alternating current with a full-wave rectifier to an inverter, and lights a discharge lamp with the high-frequency output of this inverter, the power supply is connected between the positive and negative output terminals of the full-wave rectifier, and is used for driving. a pair of switching elements that are alternately controlled on and off by each output of a pair of drive windings of a transformer; a pair of capacitors that are connected in parallel to each of the switching elements and in series with each other;
A discharge lamp and an inductance element are connected in series between an intermediate connection point of both capacitors and an intermediate connection point of both switching elements, and are connected in parallel to the discharge lamp to light the discharge lamp together with the capacitor and the inductance element. A capacitance element constituting a series resonant circuit, a secondary winding derived from the inductance element or another inductance element interposed and connected to the series resonant circuit in a current transformer manner, and an output of this secondary winding. The full-wave rectified DC voltage is compared with at least two types of threshold voltages to determine two types of abnormal conditions: a no-load state when the discharge lamp is not installed, and a preheating state when the discharge lamp is emissionless, and normal startup or lighting. A discrimination circuit that detects a total of three states including a load state, a protection circuit that stops oscillation of the inverter by outputting an abnormal state detection signal from this discrimination circuit, and a return of the discrimination circuit to a state in which no detection signal is output. 1. A lighting device for a discharge lamp, comprising: a reset section for restoring the protection circuit to its original state.