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This paper mainly introduces the working principle of double 12 pulse inverter. By analyzing the operation process of the inverter, obtaining the expression of voltage and current in both DC side and AC side respectively, and getting the relevant calculation formula of angle. Connecting two a 6 pulse converter in the DC side, we get a 12 pulse converter. Its AC side of the converter is connected in parallel through the converter transformer.Valve side of converter transformer, one is connected into a star, and the other is connected to a triangle, thus the phase difference of the exchange side is 30 degrees.The normal operation of the inverter bridge is 4-5 working states, besides there are non-normal operation modes such as 5 working states, 5-6 working states and 6 working states, etc.

Analysis of the Working Principle of 12 Pulse Inverter Bridge