초록 ▼

A current shunt for converting a current to a voltage. The current shunt of the invention is made from a conductive material such as a high performance resistance alloy in sheet form which is sheared, punched, and bent to produce a highly stable current shunt with respect to time and temperature. Co

A current shunt for converting a current to a voltage. The current shunt of the invention is made from a conductive material such as a high performance resistance alloy in sheet form which is sheared, punched, and bent to produce a highly stable current shunt with respect to time and temperature. Contact pins of current and potential connections are welded to the material using a fusion welding process, and techniques are also provided for isolating the potential contacts from the current contacts so as to improve stability. Trimming slits of the type used for thin film or foil resistors are also extended to bulk materials in accordance with the invention such that highly accurate resistances may be obtained. An integral heat sink and strain relief mechanism is also provided so as to minimize the adverse effects of temperature on the resistance of the material. The resulting current shunt has an extremely stable resistance value with respect to time and temperature at a minimal cost.

대표청구항 ▼

A high-performance current shunt for converting a current applied thereto into a potential which is precisely proportional to the current flow through said current shunt, the proportionality between said current and said potential being substantially independent of changes in ambient temperature and

A high-performance current shunt for converting a current applied thereto into a potential which is precisely proportional to the current flow through said current shunt, the proportionality between said current and said potential being substantially independent of changes in ambient temperature and the magnitude of current flow through said current shunt, said current shunt comprising: first and second current connections responsive to said input current; first and second potential connections for providing said output potential, said first and second potential connections being spaced so as to define an effective resistance value for said current shunt; and a resistive element formed of a sheet of material having a known temperature coefficient of resistance, said resistive element having said current connections and potential connections disposed thereon so as to define a current path between said first and second current connections whereby a proportion of a potential drop between said first and second current connections may be sensed at said first and second potential connections, said resistive element further including a first slit between said first and second current connections for diverting the current flow in said current path around said first slit so as to control the location of heat dissipation and to thereby prevent localized heating of said resistive element and the resultant temperature induced changes in said effective resistance and in the sensed proportion of said potential drop between said first and second current connections in said current path, and a second slit for electrically isolating said first and second potential connections from that portion of said current path between said first and second current connections at which said proportion of said potential drop is sensed, thereby eliminating variation in said temperature coefficient of resistance of said material in said current path as a result of material impurities introduced by connection of said first and second potential connections to said resistive element.