Power supply circuit, welding power source and electric welding machine

Abstract

The embodiment of the invention provides a power supply circuit, a welding power source and an electric welding machine. The power supply circuit comprises a first rectifying circuit, a first inverter circuit, a second inverter circuit and a first transformer. The first inverter circuit comprises a first connecting terminal, a second connecting terminal and two groups of switching tubes connected in series; the second inverter circuit comprises a third connecting terminal, a fourth connecting terminal and two groups of switching tubes connected in series, the input end of the first rectifying circuit is used for connecting an alternating current power supply, and the output end is connected with the first and fourth connecting terminals respectively; a secondary winding of the first transformer is used for being connected with a first power utilization system. When the alternating current power supply is the first alternating current power supply, the second connecting terminal is connected with the third connecting terminal; and when the alternating-current power supply is a second alternating-current power supply, the first connecting terminal is connected with the third connecting terminal, and the second connecting terminal is connected with the fourth connecting terminal. The power supply circuit, the welding power source and the electric welding machine can reduce design difficulty and manufacturing cost.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power supplies, and in particular, to a power supply circuit, a welding power source and an electric welding machine. Background technique [0002] In order to improve the applicability, some electrical appliances (such as electric welding machines) generally need to meet the requirements of normal operation under various network voltage inputs. The conventional solution is to set a BOOST circuit in front of the transformer of the electrical power supply or set multiple taps on the primary side of the transformer to achieve the effect of adapting to various network voltages. [0003] However, in the case where the power of the electrical appliance is high (such as an industrial welding machine), the scheme of setting a boost circuit in front of the transformer will make the cost of the boost circuit very high, and at the same time, due to the extra power stage components, the power s...

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Problems solved by technology

[0003] However, in the occasions where the electrical power is relatively large (such as industrial welding machines), the solution of installing a BOOST circuit in front of the transformer will make the cost of the boost circuit very high. At the same time, due to the additional power level components, the reliability of the power supply decreased sex

The scheme of setting multiple taps on the primary side of the transformer has higher requirements on the components of the power supply. For example, in the case where the output power requirement remains unchanged, the voltage stress of the switch tube must meet the highest input network voltage requirement. And its current stress must meet the minimum network voltage requirement (because under the condition of constant output power, the voltage and current are inversely proportional), thus causing its cost to rise sharply; Voltage design, and its wire diameter must be designed according to the minimum input voltage, so its cost will also increase significantly

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