公开(公告)号：US4025822A

公开(公告)日：1977-05-24

申请号：US602173

申请日：1975-08-05

申请人： W. Taliaferro Hughes ,  Stewart P. Barrett, Jr.

发明人： W. Taliaferro Hughes ,  Stewart P. Barrett, Jr.

IPC分类号： H02H11/00 ,  H02H3/14

CPC分类号： H02H11/002

摘要： A two to three wire converter circuit is disclosed which provides a protective function for users when using power hand tools, appliances or any electrically operated device. Many alternating current electrical supplies provide a hot or high line and a neutral line. Many electrical devices, such as hand tools and appliances, are provided with a high line, neutral and a ground line connected to the housing of the device. The present invention enables the connection of the housing ground line or the housing to the neutral line. The neutral line of an alternating current supply is connected to ground. The present invention provides a circuit for sensing which line is the high line and which line is the neutral line of an electric supply and connecting these to the electrical device only if the neutral line of the supply is connected to the neutral line of the electrical device. This invention serves an essential function since a two-prong plug may be inserted into the conventional electrical supply outlet two ways, the correct way with the normally high sides being connected, or incorrectly with the high side of supply being connected to the neutral line of the electrical device.The purpose of the above abstract is to provide a non-legal technical statement of the disclosure of the contents of the instant patent application and thus serve as a searching-scanning tool for scientists, engineers and researchers. Accordingly, this abstract is not intended to be used in understanding or otherwise comprehending the principles of the present invention hereinafter described in detail, nor is it intended to be used in interpreting or in any way limiting the scope or fair meaning of the claims appended hereto.

摘要翻译： 公开了一种二至三线转换器电路，其在使用电动手动工具，器具或任何电动装置时为用户提供保护功能。 许多交流电源提供热线或高线和中性线。 诸如手动工具和电器的许多电气装置设置有连接到装置的壳体的高线，中性线和地线。 本发明使得壳体接地线或壳体与中性线的连接。 交流电源的中性线连接到地。 本发明提供了一种电路，用于感测哪条线是高线，哪条线是电源的中性线，并且只有当电源的中性线连接到电气设备的中性线时才将其连接到电气设备 。 本发明具有基本功能，因为双头插头可以插入常规电源插座两种方式，正常方式与正常高端连接，或者错误地将电源的高侧连接到中性线 电气设备。

公开(公告)号：US4087846A

公开(公告)日：1978-05-02

申请号：US735938

申请日：1976-10-27

申请人： W. Taliaferro Hughes ,  Stewart P. Barrett, Jr.

发明人： W. Taliaferro Hughes ,  Stewart P. Barrett, Jr.

IPC分类号： H02H3/10 ,  H02H11/00

CPC分类号： H02H11/002 ,  H02H3/105

摘要： A protective circuit apparatus is disclosed for disconnecting power flow to an electrical device upon the sensing of a predtermined condition such as current flow above a predetermined level in the ground line or current flow in excess of a predetermined level in the power or hot line. In a preferred embodiment, the circuit for detecting excess current flow in the ground wire and the circuit for detecting excess current flow in the hot line are connected in series with a two to three wire converter circuit which insures proper connection to a source of electrical energy.

摘要翻译： 公开了一种保护电路装置，用于在感测到预定条件（例如在地线中的预定电平以上的电流或超过电力或热线中的预定水平的电流）的情况下断开到电气设备的功率流。 在优选实施例中，用于检测接地线中的过大电流的电路和用于检测热线中的过电流的电路与两线到三线转换器电路串联连接，确保与电能源的适当连接 。