Holdup Time Circuit and Method for Bridgeless PFC Converter
AssigneeFuturewei Technologies, Inc.
InventorsDianbo Fu, Hengchun Mao, Bing Cai
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Abstract
An embodiment holdup time circuit of a bridgeless power factor correction circuit comprises a charge device connected between an output terminal of a bridgeless power factor correction circuit and an energy storage apparatus, a discharge device connected between the energy storage apparatus and an input of the bridgeless power factor correction circuit, the energy storage apparatus and the bridgeless power factor correction circuit comprising a first boost converter, a second boost converter, a first switch and a second switch, wherein the first switch is connected between the first boost converter and ground and the second switch is connected between the second boost converter and ground.
Claims20
A circuit comprising:
- a charge device connected between an output terminal of a bridgeless power factor correction circuit and an energy storage apparatus;
- a discharge device connected between the energy storage apparatus and an input of the bridgeless power factor correction circuit;
- the energy storage apparatus;
- and
- the bridgeless power factor correction circuit comprising a first boost converter, a second boost converter, a first switch and a second switch, wherein:
- the first switch is connected between the first boost converter and ground;
- and
- the second switch is connected between the second boost converter and ground.
A system comprising:
- a bridgeless power factor correction circuit comprising a first boost converter coupled between an input ac source and an output, a second boost converter coupled between the input ac source and the output, a first switch coupled between an input of the first boost converter and ground and a second switch coupled between an input of the second boost converter and ground;
- a charge device connected between an output terminal of a bridgeless power factor correction circuit and an energy storage apparatus;
- and
- a discharge device connected between the energy storage apparatus and an input of the bridgeless power factor correction circuit.
A method comprising:
- charging an energy storage apparatus through a charge device, wherein the charge device is coupled between an output of a bridgeless power factor correction circuit and the energy storage apparatus;
- detecting a dropout of an input ac source coupled to an input of the bridgeless power factor correction circuit;
- and
- discharging the energy storage apparatus through a discharge device, wherein the discharge device is connected between the energy storage apparatus and the input of the bridgeless power factor correction circuit.
Dependencies are inferred from the claim text.