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2. 发明授权

US5461671A Telephone line power utility circuit 失效
标题翻译：电话线电源线路
公开(公告)号：US5461671A
公开(公告)日：1995-10-24
申请号：US070606
申请日：1993-06-01
申请人： Satosi Sakuragi , Takashi Kuroda
发明人： Satosi Sakuragi , Takashi Kuroda
IPC分类号： H04M19/08 , H04M19/00
CPC分类号： H04M19/08
摘要： A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current resistance, the telephone line power utility circuit including a DC-DC converter connected with the line terminal device for supplying the direct-current power to the line terminal device, the DC-DC converter having an input direct-current resistance; and a central processing unit (CPU), connected with the DC-DC converter, for obtaining a maximum input direct-current resistance of the DC-DC converter to increase the efficiency of receiving power of the DC-DC converter by allowing the direct-current resistance of the line terminal device, viewed from the telephone line-side, to satisfy a predetermined standard, controlling the duty ratio of the primary side switching element, and/or switching the taps of the primary side winding of the transformer of the DC-DC converter, such that the direct-current power supplied through the telephone line can effectively be used as a power source for the line terminal device.
摘要翻译：将通过电话线侧提供的直流电力用作用于具有直流电阻的线路终端装置的电源的电话线路电力公用电路，所述电话线电力公用电路包括DC-DC转换器与用于向线路终端装置提供直流电力的线路终端装置连接，DC-DC转换器具有输入直流电阻; 以及与DC-DC转换器连接的中央处理单元（CPU），用于通过允许DC-DC转换器获得DC-DC转换器的最大输入直流电阻以提高DC-DC转换器的接收功率的效率，从电话线侧观察，线路终端装置的电流电阻满足预定标准，控制初级侧开关元件的占空比和/或切换DC的变压器的一次侧绕组的抽头 -DC转换器，使得通过电话线提供的直流电力可以有效地用作线路终端设备的电源。

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