Single-stage input current shaping technique with voltage-doubler rectifier front-end
First Claim
1. A single-stage input current shaping (S2 ICS) converter coupled to receive a line voltage, comprising:
- a front-end stage receiving said line voltage, including;
(a) a full-bridge rectifier;
(b) one or more boost inductors;
(c) first and second dither sources each coupled in series with one of said boost inductors; and
(d) first and second storage capacitors, coupled to said full-bridge rectifier in a voltage-doubler configuration and coupled respectively to said first and second dither sources, such that each of said first and second capacitors is charged by one of said boost inductors for storing energy for output; and
a DC/DC power converter stage, coupled to both said storage capacitor and said dither source, to transfer said energy stored in said storage capacitor to an output load.
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Abstract
A single-stage input-current-shaping (S2 ICS) converter of the present invention integrates a voltage-doubler-rectifier front-end with a DC/DC output stage. Two families of voltage-doubler S2 ICS converters are disclosed. In one family, a 2-terminal dither source is provided between a boost inductor and a common input terminal of a storage capacitor and the DC/DC output stage. The 2-terminal dither source includes two paths connected in parallel: a first path for charging and a second path for discharging the boost inductor at a high frequency (HF). In the other family, a 3-terminal dither source includes a third terminal coupled to a pulsating node of the DC/DC output stage. In the 3-terminal dither source, the HF charging path of the boost inductor is coupled between the boost inductor and the pulsating node of the DC/DC output stage, while the HF discharging path of the boost inductor is coupled between the boost inductor and the common input terminal of the storage capacitor and the DC/DC output stage. Due to the voltage-doubler-rectifier front-end, reduction of line-current harmonics can be achieved with a higher conversion efficiency, as compared to a corresponding S2 ICS converter with a conventional full-bridge rectifier. In addition, a converter of the present invention requires storage capacitors of a lower voltage rating and a smaller total capacitance than the conventional S2 ICS counterpart. The present invention thereby reduces the size and the cost of the power supply.
41 Citations
16 Claims
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1. A single-stage input current shaping (S2 ICS) converter coupled to receive a line voltage, comprising:
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a front-end stage receiving said line voltage, including; (a) a full-bridge rectifier; (b) one or more boost inductors; (c) first and second dither sources each coupled in series with one of said boost inductors; and (d) first and second storage capacitors, coupled to said full-bridge rectifier in a voltage-doubler configuration and coupled respectively to said first and second dither sources, such that each of said first and second capacitors is charged by one of said boost inductors for storing energy for output; and a DC/DC power converter stage, coupled to both said storage capacitor and said dither source, to transfer said energy stored in said storage capacitor to an output load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification