JPS6238089U

JPS6238089U -

Info

Publication number: JPS6238089U
Application number: JP13015485U
Authority: JP
Priority date: 1985-08-27
Filing date: 1985-08-27
Publication date: 1987-03-06

Description

[Brief explanation of the drawing]

第１図は本考案の第１の実施例を示す回路構成
図、第２図は本考案の第２の実施例を示す回路構
成図、第３図は本考案の応用例を示す回路構成図
、第４図及び第５図は同上に用いられる定電流源
を示す回路構成図、第６図は従来例を示す回路構
成図である。１は交流電源、２は定電圧回路、３はスイツチ
ング制御回路、４は電圧変換回路、Ｔはトランス
、Ｌ_１は１次巻線、Ｌ_２は２次巻線、Ｌ_３は３次
巻線、Ｑ_１〜Ｑ_２はトランジスタ、Ｒｙはリレー
、ｒは常閉接点、Ｃ_２はコンデンサ、Ｒ_１，Ｒ_２は抵抗である。 Fig. 1 is a circuit diagram showing a first embodiment of the invention, Fig. 2 is a circuit diagram showing a second embodiment of the invention, and Fig. 3 is a circuit diagram showing an application example of the invention. , FIG. 4 and FIG. 5 are circuit configuration diagrams showing a constant current source used in the same, and FIG. 6 is a circuit configuration diagram showing a conventional example. 1 is an AC power supply, 2 is a constant voltage circuit, 3 is a switching control circuit, 4 is a voltage conversion circuit, T is a transformer, L ₁ is a primary winding, L ₂ is a secondary winding, L ₃ is a tertiary winding , _Q1 to _Q2 are transistors, Ry is a relay, r is a normally closed contact, _C2 is a capacitor, _R1 , _R2 is resistance.

Claims

[Scope of utility model registration request]

A rectifying and smoothing circuit converts AC power supply voltage into DC voltage, and the output of the rectifying and smoothing circuit is connected to the primary winding of the transformer by switching a switching element connected in series to the secondary winding, which is the output winding, and the auxiliary winding. A voltage conversion circuit that induces a voltage in the tertiary winding, which is a winding, and a voltage conversion circuit that controls the switching of the switching element of the voltage conversion circuit, and after the voltage conversion circuit operates, the voltage induced in the tertiary winding of the transformer is controlled. a switching control circuit that operates with a rectified voltage; a constant voltage circuit that stabilizes the output of the rectifying and smoothing circuit and consists of a Zener diode and a bias resistor of the Zener diode; and the switching control circuit is activated by the constant voltage circuit. and operation control means for cutting off the bias current of a Zener diode in a constant voltage circuit.