JPH0186486U

JPH0186486U -

Info

Publication number: JPH0186486U
Application number: JP18218487U
Authority: JP
Priority date: 1987-11-30
Filing date: 1987-11-30
Publication date: 1989-06-08

Description

[Brief explanation of the drawing]

第１図は本考案の原理ブロツク図、第２図は本
考案の一実施例の回路図、第３図は定常な発振状
態でのインバータ回路中の発振用トランジスタの
コレクタ電流及びコレクタ電圧の変化を示す図、
第４図は負荷がオープン状態となつたときの発振
状態を示す図、第５図は発振が停止した場合のイ
ンバータ回路中の発振用トランジスタのコレクタ
電流及びコレクタ電圧の変化を示す図、第６図は
ＥＬ素子の等価回路、第７図は従来のＥＬ素子点
灯用のインバータ回路の回路図である。１，８……インバータ回路、２……定電圧発生
手段、３……整流手段、５……端子、６……起動
及び発振停止保護回路、１１，１５……ＥＬ素子
、Ｑ_１〜Ｑ_５……ＮＰＮトランジスタ。 Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a circuit diagram of an embodiment of the invention, and Fig. 3 is a change in collector current and collector voltage of an oscillation transistor in an inverter circuit in a steady oscillation state. A diagram showing
Fig. 4 is a diagram showing the oscillation state when the load is in an open state, Fig. 5 is a diagram showing changes in the collector current and collector voltage of the oscillation transistor in the inverter circuit when oscillation is stopped, and Fig. The figure is an equivalent circuit of an EL element, and FIG. 7 is a circuit diagram of a conventional inverter circuit for lighting the EL element. 1, 8... Inverter circuit, 2... Constant voltage generating means, 3... Rectifying means, 5... Terminal, 6... Starting and oscillation stop protection circuit, 11, 15... EL element, Q ₁ to Q ₅ ...NPN transistor.

Claims

[Claims for Utility Model Registration] Constant voltage generation control means that generates a constant voltage from the voltage supplied to an input terminal and supplies the constant voltage to an inverter circuit that converts DC input into AC output through oscillation; Feedback rectification means rectifies the AC output of the inverter circuit and returns it to the output side of the constant voltage generation control means, and the inverter circuit rectifies the constant voltage generated by the constant voltage generation control means in the initial state after power is turned on. Oscillation is started by a voltage, and thereafter oscillation is performed by a voltage obtained by adding the constant voltage from the constant voltage generation control means and the feedback voltage of the feedback rectification means, and when the oscillation stops. A protection circuit for an inverter circuit that protects the inverter circuit by supplying only the constant voltage from the constant voltage generation control means to the inverter circuit.