Bridgeless step-up and step-down AC-to-DC converter
AssigneeAsian Power Devices Inc.
InventorsYeu-Torng Yau, Tsung-Liang Hung
Life of this patent
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Abstract
A bridgeless step-up and step-down AC-to-DC converter is used to convert an AC input power source into a DC output power source. The converter includes a first circuit, a second circuit, a third circuit, a third diode, and a fourth diode. The first circuit has a first end, a second send, and a third end; the first end is coupled to the AC input power source, the second end is coupled to a ground end, and the third end is coupled to the DC output power source. The second circuit has a first end, a second end, and a third end; the first end is coupled to the AC input power source, the second end is coupled to the ground end, and the third end is coupled to the DC output power source.
Claims9
A bridgeless step-up and step-down AC-to-DC converter configured to convert an AC input power source into a DC output power source with a positive end and a negative end across an output capacitor, the bridgeless step-up and step-down AC-to-DC converter comprising:
- a first circuit having a first end, a second end, and a third end;
- the first end of the first circuit coupled to a first end of the AC input power source, the second end of the first circuit coupled to a ground end, and the third end of the first circuit coupled to the positive end or the negative end of the DC output power source, wherein the first circuit comprises:
- a first switch having a first end, a second end, and a control end;
- the first end of the first switch coupled to the first end of the AC input power source,
- a first inductor having a first end and a second end;
- the first end of the first inductor coupled to the second end of the first switch, and the second end of the first inductor coupled to the ground end, and
- a first diode having a cathode end and an anode end;
- the cathode end of the first diode coupled to the second end of the first switch and the first end of the first inductor, and the anode end of the first diode coupled to the positive end or the negative end of the DC output power source,
- a second circuit having a first end, a second end, and a third end;
- the first end of the second circuit coupled to a second end of the AC input power source, the second end of the second circuit coupled to the ground end, and the third end of the second circuit coupled to the positive end or the negative end of the DC output power source,
- a third diode coupled between the first end of the second circuit and the ground end, and
- a fourth diode coupled between the first end of the first circuit and the ground end.
Dependencies are inferred from the claim text.