Development of the electronic ballast transformed the neutral point type back boost inverter

The new circuit of the electronic ballast for the fluorescent lamp, which Is based on the back-boost converter is proposed. This circuit has the advantage further than the circuit that combined the converter for rectification with the inverter for lighting in some points. Those advantages are reduction of the number of elements and and improvement in the circuit efficiency, etc. And this circuit also satisfies regulation value of IEC class C on the relative harmonic contents of input current. From analyses of circuit operations and experimental results, the of circuit operations and experimental results, the effectiveness of the proposed circuit is shown.