Energy-saving electric welding machine
The invention discloses an energy-saving electric welding machine, and belongs to the field of electrical arc welding devices. The energy-saving electric welding machine comprises a primary coil and a secondary coil, and is characterized by further comprising a PLC, a starting circuit, a voltage detection circuit and a relay KM. The starting circuit comprises a first alternating-current transformer, and the secondary side of the first alternating-current transformer is connected with the secondary coil. The voltage detection circuit comprises a second alternating-current transformer, the primary side of the second alternating-current transformer is connected with the secondary coil, the secondary side of the second alternating-current transformer provides working power for a rectifier bridge, and the output end of the rectifier bridge provides a control signal for the PLC. A coil power source of the relay KM is controlled by the PLC, and a power source of the primary coil is controlled by a normally-open contact of the relay KM. According to the energy-saving electric welding machine, the defects caused by damage of a time relay are overcome, and meanwhile coil heating and copper losses of the energy-saving electric welding machine are reduced. 1. An energy-saving electric welding machine, including a primary coil and a secondary coil, characterized in that also comprises a PLC controller, a starting circuit, a voltage detecting circuit and relay km; Starting circuit includes AC transformer 1st, 1st AC of the secondary sides of the transformers is connected with the sub-coil; Voltage alternating current transformer detection circuit includes a 2nd, 2nd AC transformer is connected to the primary side and the secondary coil, the secondary side to provide working power supply rectifier bridge, the output end of the rectifier bridge PLC controller provides the control signal; PLC controller km of a coil power supply for the control relay, the normally open contact of relay km control the primary coil of the power supply. 2. In accordance with the energy-saving electric welder according to Claim 1, characterized in that the normally closed contact of the relay km exchange of the power supply of the transformer control 1st. 3. In accordance with the energy-saving electric welder according to Claim 2, characterized in that also the middle relay KA, PLC controller controlling the intermediate relay KA of a coil power supply, according to the intermediate relay KA PLC controller of the normally closed contact state of a coil power supply control relay km. 4. In accordance with the energy-saving electric welder according to Claim 3, characterized in that the middle KA controlled by a normally open contact of relay AC transformer 1st to the secondary side of the make-and-break of the secondary coil.