DC-AC INVERTER HAVING CONTROLLED MAGNETIZATION REVERSAL OF ISOLATION TRANSFORMER CORE

摘要

Disclosed is a power inverter which converts voltage from a DC source into high frequency rectangular alternating voltage pulses which are transferred to a load via a transformer with a ferromagnetic core having no air gap. An additional indicator winding on the transformer, which is connected to a differential circuit which in turn is connected to a control circuit, makes it possible to control the process of the reversal of the magnetization of the core. Switching on the primary winding takes place when the permeability of the transformer's core achieves its maximum. This special feature makes it possible to minimize the size of the transformer, while allowing transferring maximum energy to the load with minimum of the magnetization frequency and losses.

主权项

1. A DC-AC inverter, said inverter comprising:
a DC voltage source connector; a load connector; a choke having an air gap; an isolation transformer comprising
a closed ferromagnetic core, said closed ferromagnetic core having no air gap,at least one primary winding configured to reverse a magnetization of said closed ferromagnetic core,at least one secondary winding electrically coupled to said load connector, and an indicator winding; wherein said choke is eclectically connected in series with a magnetizing circuit of said isolation transformer; a switching circuit electrically coupled to said at least one primary winding and configured to change direction of a magnetizing current in said isolation transformer; and a differential circuit, having an input electrically coupled to said indicator winding, an output electrically coupled to said switching circuit and configured to transmit signals to said switching circuit.