Lian Zheng Electronics (shenzhen) Co., Ltd.

Lian Zheng Electronic (shenzhen) Co., Ltd.

Wuhua Hu

Kaijun Xie

Liang Deng

Disclosed are an offline uninterruptible power source and a control method therefor. The offline uninterruptible power source comprises: a safety switch () connected between an alternating-current input end () and an alternating-current output end (′); a transformer (Tr), wherein one end of a primary side thereof is connected to one terminal of the alternating-current output end (′); a first switch (), a second switch () and an output switch (), which are successively connected between the safety switch () and the other terminal of the alternating-current output end (′), wherein the first switch () is operable such that the safety switch () is connected to either of the other end or a tap of the primary side of the transformer (Tr), and the second switch () is operable such that the output switch () is connected to either of the other end or the tap of the primary side of the transformer (Tr); a third switch (), which is operable such that the safety switch () is connected to either of the first switch () or the other terminal of the alternating-current output end (′); and a bidirectional converter (). The offline uninterruptible power source has high electric energy transmission efficiency.

Offline uninterruptible power source and control method therefor

The present invention relates to a control method for supporting active power factor correction (APFC) loads, comprising: providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output voltage, in order to meet the requirements for active power factor correction (APFC) loads; and gradually decreasing square wave width of the output voltage waveform from the comparatively large value to a comparatively small value to gradually decrease effective value of the output voltage to a desirable stable voltage effective value. The present invention further relates to a control system for supporting active power factor correction (APFC) loads, comprising: a voltage increasing unit for providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output voltage, in order to meet the requirements for active power factor correction (APFC) loads; and a voltage stabilizing unit for adjusting square wave width to a comparatively large value, and gradually decreasing square wave width of the output voltage waveform from the comparatively large value to a comparatively small value to gradually decrease effective value of the output voltage to a desirable stable voltage effective value.

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Shenzhen, China

Wuhua Hu