Dual-voltage power supply circuit and inverter welding machine comprising same

Abstract

The invention discloses a dual-voltage power supply. The dual-voltage power supply comprises a power input end, a power output end, a control transformer, a power supply control circuit and a voltage detection circuit, wherein a rectifier circuit and a voltage-doubling circuit are connected in series between the power input end and the power output end; the control transformer is connected with the power input end; the power supply control circuit and the voltage detection circuit are connected with the control transformer; the power supply control circuit comprises a first relay and a second relay, wherein the first relay is arranged between the power input end and the control transformer, and the second relay is arranged among the power input end, the rectifier circuit and the voltage-doubling circuit; the control transformer is provided with a 220V primary winding and a 380V primary winding; and the voltage-doubling circuit comprises two groups of capacitor-resistor circuits which are connected in series with each other. An inverter welding machine can be used in the places with a power supply of 380 V or 220 V very conveniently; a good radiating effect is achieved; the connection wires among the components are the shortest; and a rectifier board adopts an integrated output piece, so that the faults of the rectifier board are reduced.

Description

technical field

[0001] The invention relates to an inverter welding machine, more specifically an inverter welding machine that can be connected to a power supply circuit of two kinds of power sources of 380V and 220V. Background technique

[0002] In the prior art, there are usually two types of power supply specifications for various domestic electrical products, one is 380V and the other is 220V. In order to facilitate the use of power supplies of different specifications, a manual switch is usually used to select different specifications of the power supply. However, when switching manually, it is easy to make mistakes. For example, when switching the power supply of electrical products to 220V before use, it may be directly plugged into a 380V power supply without judgment, which will burn out the power supply circuit. In addition, due to the use of manual switching switches, in addition to manual judgment before using the power supply, manual operations are also requi...

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