The general design of transformers for static inverters is considered and it is shown how a control signal may be obtained to prevent core saturation. Use of a core material whose saturation flux density reduces with increasing temperature is advocated to reduce the temperature sensitivity of the output voltage. The magnetic circuit of the linear core material is divided into five branches by two holes (36,37) of unequal size carefully positioned in the core so that a current in the control winding (19) and in the primary winding (16) causes a small part of the core to saturate before the main core. This saturation reduces the coupling between the windings (19,20) which are tightly coupled in the linear region. The winding (19) thus provides an output which reduces as the core approaches saturation.
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