Honda Giken Kogyo Kabushiki Kaisha

Gen Tujii

Hitoshi Saito

Fumitomo Takano

Kenji Miyanaga

Yuko Suzuki

A direct current resistance welding machine and a method of controlling the direct current resistance welding machine wherein primary current of a welding transformer is detected when a plurality of switching devices of an inverter are controlled based on corresponding pulses having a predetermined frequency and each having a time width corresponding to the value of a required secondary current. Rise and fall times of the detected primary current are detected. An upper limit frequency Of the primary current is computed based on the time width of each pulse and on the rise and fall times. Thus, the primary current of the welding transformer is controlled by controlling the switching devices based on pulses having a frequency falling within the computed upper limit frequency.

Growing community of inventors

Sayama, Japan

Gen Tujii