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This paper proposes a new bridgeless single-stage half-bridge ac-dc converter. The proposed converter integrates the operation of the bridgeless power factor correction (PFC) boost rectifier and the asymmetrical pulse-width modulation (APWM) half-bridge dc-dc converter. The proposed converter provides high power factor and direct power conversion from the line voltage to an isolated dc output voltage...
Most modern variable-speed motor drives are based on pulse width modulated voltage source inverters, supplied from a smooth DC link voltage. This is often obtained from a three-phase diode bridge mains rectifier with a large output capacitor to keep the DC link voltage essentially constant. The AC currents at the input of the bridge are often discontinuous and contain high levels of harmonics. Harmonic...
The energy supply systems of telecommunications power stations are based on rectifier units of high power factor, compact with high efficiency. To obtain high power factor it is necessary to use in the ac-to-dc conversion stage a power factor pre-regulator, which leads to an increase of the input voltage levels of the dc-to-dc stage. In order to reduce the voltage efforts over the switches of the...
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