JPH02125538U

JPH02125538U -

Info

Publication number: JPH02125538U
Application number: JP1487389U
Authority: JP
Priority date: 1989-02-10
Filing date: 1989-02-10
Publication date: 1990-10-16

Description

[Brief explanation of drawings]

第１図は本考案によるインバータ回路の一実施
例の構成を示す回路図、第２図は第１図のインバ
ータ回路における一次側コイルの周波数の変換特
性を示すグラフである。第３図は従来のインバー
タ回路の一例を示す回路図である。１０……インバータ回路；１１……トランス；
１２ａ……入力端子；１２ｂ……アース端子；１
３……ヒユーズ；１４……チヨークコイル；１５
，１６……発振用トランジスタ；１７……電解コ
ンデンサ；１８……ＣＦＬ；２０……保護回路；
２１……ＳＣＲ；２２……ブリツジ整流回路；２
３……コンデンサ；２４……抵抗；２５……コン
パレータ；２６……ダイオード。 FIG. 1 is a circuit diagram showing the configuration of an embodiment of an inverter circuit according to the present invention, and FIG. 2 is a graph showing the frequency conversion characteristics of the primary coil in the inverter circuit of FIG. 1. FIG. 3 is a circuit diagram showing an example of a conventional inverter circuit. 10...Inverter circuit; 11...Transformer;
12a...Input terminal; 12b...Earth terminal; 1
3... Fuse; 14... Chiyoke coil; 15
, 16... Oscillation transistor; 17... Electrolytic capacitor; 18... CFL; 20... Protection circuit;
21...SCR; 22...Bridge rectifier circuit; 2
3... Capacitor; 24... Resistor; 25... Comparator; 26... Diode.

Claims

[Claims for Utility Model Registration] A transformer in which one end of the primary coil is connected to the input side via a chiyoke coil, the base is connected to one end of the primary coil of the transformer, and the collector is connected to the input side of the primary coil of the transformer. It includes an oscillation transistor connected to the other end and whose emitter is connected to ground, and by causing the oscillation transistor to oscillate and applying its oscillation output to the primary side of the transformer, the secondary In an inverter circuit in which an inverter output is obtained on the next side, a fuse inserted between the above-mentioned chiyoke coil and the input, a switching element connected between the input side of the chiyoke coil and the ground, and the above-mentioned transformer. It is equipped with a detection conversion circuit that detects the frequency of the voltage applied to both ends of the primary coil and converts it into a DC voltage, and a comparator that compares the DC voltage output from the detection conversion circuit with a reference voltage. An inverter circuit characterized in that when the frequency of the primary coil of a transformer falls below a predetermined value, a signal is output from a comparator to turn on a switching element and blow a fuse.