JPH0446398U

JPH0446398U -

Info

Publication number: JPH0446398U
Application number: JP8895690U
Authority: JP
Priority date: 1990-08-25
Filing date: 1990-08-25
Publication date: 1992-04-20

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の電気的構成を示す
ブロツク図、第２図は第１図示の実施例の動作を
説明するための波形図、第３図は本考案の他の実
施例の構成を示すブロツク図、第４図は第３図示
の実施例の動作を説明するための波形図、第５図
は本考案のさらに他の実施例の構成を示すブロツ
ク図、第６図は従来からの調光装置の電気的構成
を示すブロツク図である。１……調光装置、２……交流電源、３……蛍光
灯、４，５……フイラメント、６……調光用変圧
器、９……予熱用変圧器、１３……調光用安定器
、１４……第１双方向性三端子サイリスタ、１５
……第２双方向性三端子サイリスタ、１７……第
１ホトカプラ、２１……第２ホトカプラ、２４…
…第１比較回路、２５……切換スイツチ、２９…
…第２比較回路、３０……のこぎり波発生回路、
３１……第３比較回路、３４…非零検知回路、３
５……調光回路、３６，４１……トリガ素子、３
７，３９……可変抵抗器、３８，４０……コンデ
ンサ、４５……第３ホトカプラ、４９……単安定
回路。 Fig. 1 is a block diagram showing the electrical configuration of one embodiment of the present invention, Fig. 2 is a waveform diagram for explaining the operation of the embodiment shown in Fig. 1, and Fig. 3 is another embodiment of the present invention. FIG. 4 is a waveform diagram for explaining the operation of the embodiment shown in FIG. 3, FIG. 5 is a block diagram showing the structure of still another embodiment of the present invention, and FIG. FIG. 1 is a block diagram showing the electrical configuration of a conventional light control device. 1...Dimmer device, 2...AC power supply, 3...Fluorescent lamp, 4, 5...Filament, 6...Dimmer transformer, 9...Preheating transformer, 13...Dimming stability device, 14...first bidirectional three-terminal thyristor, 15
...Second bidirectional three-terminal thyristor, 17...First photocoupler, 21...Second photocoupler, 24...
...First comparison circuit, 25... Changeover switch, 29...
...Second comparison circuit, 30...Sawtooth wave generation circuit,
31...Third comparison circuit, 34...Non-zero detection circuit, 3
5...Dimmer circuit, 36, 41...Trigger element, 3
7, 39... variable resistor, 38, 40... capacitor, 45... third photocoupler, 49... monostable circuit.

Claims

[Scope of Claim for Utility Model Registration] An AC power supply, a hot cathode discharge lamp, a first phase control circuit for controlling power supplied from the AC power supply to light the hot cathode discharge lamp, and a first phase control circuit. If the phase angle controlled by and a second phase control circuit that preheats the hot cathode at a predetermined minimum phase angle when the phase angle to be controlled is less than or equal to a predetermined phase angle.