JPS58101497U

JPS58101497U - discharge lamp starting device

Info

Publication number: JPS58101497U
Application number: JP19599381U
Authority: JP
Inventors: 谷河　孝一郎; 久保　和典; 実山本; 正澄高倉
Original assignee: 松下電工株式会社
Priority date: 1981-12-29
Filing date: 1981-12-29
Publication date: 1983-07-09
Also published as: JPS6245439Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来例の回路図、第２図ａ、　ｂは同上の動作
説明図、第３図は本考案−実施例の回路図、第４図は伸
の実施例のブロック図、第５図は同上の要部具体回路図
、第６図乃至第８図はそれぞれさらに他の実施例の要部
具体回路図である。Fig. 1 is a circuit diagram of a conventional example, Fig. 2 a and b are explanatory diagrams of the same operation as above, Fig. 3 is a circuit diagram of an embodiment of the present invention, Fig. 4 is a block diagram of an embodiment of the invention, and Fig. 5 The figure is a specific circuit diagram of the main part of the same as the above, and FIGS. 6 to 8 are specific circuit diagrams of main parts of still other embodiments.

Claims

[Scope of utility model registration request]

(1) A main lighting circuit is formed by connecting an AC power supply between the power supply side terminals of both filaments of the discharge lamp via a ballast made of an inductive impedance element, and a normally closed contact is connected between the non-power supply side terminals of both filaments. A contact drive circuit that turns off the normally closed contact based on the filament preheating current is inserted in series with the filament preheating circuit, and also turns the normally closed contact off based on the lighting current. A contact holding circuit is provided to hold the contact in place, and a constant voltage element is connected in parallel to the contact drive circuit to make the current flowing through the contact and drive circuit constant, thereby making the on period of the normally closed contact constant after AC power is applied. Discharge lamp starting device consisting of:

(2) Connect the normally closed contact of the thermal switch between the non-power side terminals of both filaments, and connect the contact drive circuit and A discharge lamp starting device according to claim 1, which is a registered utility model and comprises a contact holding circuit and a constant voltage element made of a bidirectional constant voltage element connected in parallel to the heater.

(3) A series circuit consisting of the normally closed contact of the thermal switch and a contact drive circuit consisting of the main heater thermally coupled to the thermal switch is connected between the non-power side terminals of both filaments, and the voltage across the discharge lamp is set in advance. Utility model registration claim 1 comprising a lighting detection circuit that outputs a lighting detection signal when a voltage is reached, and a holding heater heated by the lighting detection signal and thermally coupled to a thermal switch to form a contact holding circuit.
Discharge lamp starting device as described in .

(4) The discharge lamp starting device according to claim 3, which is a utility model registered claim, in which a normally closed contact is formed by a transistor controlled by a heat sensitive element, and the main heater and the holding heater are thermally coupled to the heat sensitive element. .

(5) A lighting detection circuit that forms a contact drive circuit with the main excitation coil that drives the normally closed contact via an operation delay element, and outputs a lighting detection signal when the voltage across the discharge lamp reaches a preset voltage. and a holding excitation coil that holds the normally closed contact in the OFF state in response to a lighting detection signal, forming a contact holding circuit.