Series independent frequency changer - has silicon-controlled rectifier bridge-network of AC and DC diagonals with polarised magnetic resonance circuit

摘要

The series-type independent inverter comprises a bridge network that includes silicon controlled rectifiers. The bridge network has an AC diagonal provided with a circuit comprised of LC-elements. It has a DC diagonal provided with a coupling capacitor, and also one uncontrolled semiconductor rectifier, to limit the voltage across the silicon controlled rectifiers. The inverter includes a saturated ferromagnetic element with a polarised magnetic circuit and with a primary winding inserted in the DC diagonal of the bridge network to form together with the latter, a ferroresonance circuit. A filter is tuned to a frequency that is a multiple of the input frequency of the saturated ferromagnetic element and connected to the secondary winding of the element.