A filter for silicon-controlled rectifier commutation and harmonic attenuation in high-power inverters

This paper discusses the synthesis of a class of a-c filters for use with high-power silicon-controlled rectifier (SCR) inverters. Three features of the class of filters described include: (1) means to commutate or ¿turn off¿ the SCR´s in the inverter; (2) a voltage transfer function which is virtually independent of load impedance at the fundamental frequency; and (3) high harmonic attenuation for the purpose of producing a high-quality sine-wave voltage from a square-wave inverter. An example of the design of one particular filter in this class is given and its characteristics are discussed in detail.