JPH02118669U

JPH02118669U -

Info

Publication number: JPH02118669U
Application number: JP2557789U
Authority: JP
Priority date: 1989-03-08
Filing date: 1989-03-08
Publication date: 1990-09-25

Description

[Brief explanation of drawings]

図は本考案の一実施例による溶接用サイリスタ
整流回路の電源電圧選定回路の構成を示す図であ
る。Ｋ１，Ｋ２，Ｋ４……常時閉接点、Ｋ３，Ｋ５
……常時開接点、Ｔ１……降圧トランス。 The figure is a diagram showing the configuration of a power supply voltage selection circuit for a welding thyristor rectifier circuit according to an embodiment of the present invention. K1, K2, K4...Normally closed contact, K3, K5
...Normally open contact, T1...Step-down transformer.

Claims

[Scope of utility model registration claim] 20 as a rectifier input for outputting welding current
A firing signal generation circuit for outputting a firing signal to a thyristor rectifier circuit that can share 0V and 400V AC power supplies uses the output voltage of a step-down transistor whose input voltage is a 100V AC power supply as a reference voltage for phase control. In addition, the primary winding of this step-down transformer has a thyristor rectification input of 200V or 400V.
In the power supply voltage selection circuit of the welding thyristor rectifier circuit, which is constructed of two identical winding circuits connected in parallel or in series depending on the First, connect the relay that operates at 400V, and connect the above two through one normally open contact of this relay.
winding circuits are connected in series, two normally closed contacts of the relay are respectively connected to the two winding circuits for parallel connection, and also instructing the use of 200V when the relay is not activated, A power supply voltage selection circuit characterized in that it is equipped with a voltage indicator that instructs the use of 400V during operation.