Shunt resistor and manufacturing method thereof
AssigneeRohm Co., Ltd.
InventorTomohiro YONEKURA
Life of this patent
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Abstract
A shunt resistor has a pair of electrode parts and a resistor body. Each of the pair of electrode parts has a flat section to be mounted on a mounting surface, and an inclined section bonded to the resistor body such that it inclines from the flat section towards the resistor body, which is positioned at a height differing from that of the mounting surface. Each of the pair of electrode parts has a force terminal, a sense terminal, and a slit. The slit is formed between the force terminal and the sense terminal. One of the position, length, or width of the slit is adjusted such that a temperature coefficient of resistance is brought closer to 0 ppm/° C.
Claims14
A shunt resistor, comprising:
- a pair of electrode parts including a first electrode part and a second electrode part;
- and
- a resistor body arranged between the first electrode part and the second electrode part and joined to the first electrode part and the second electrode part, respectively,
- wherein the resistor body is positioned at a height differing from that of a mounting surface on which the pair of electrode parts is to be mounted, and
- wherein each of the pair of electrode parts has:
- a force terminal to which electric current is to be applied;
- a sense terminal from which a voltage is to be measured;
- a slit formed between the force terminal and the sense terminal, cut from a non-joined side not connected to the resistor body toward a joined side connected to the resistor body;
- a flat section that is to be mounted on the mounting surface;
- and
- an inclined section joined to the resistor body such that the inclined section inclines from the flat section to the resistor body.
A manufacturing method of a shunt resistor having a slit, comprising:
- forming a resistor body by processing an alloy;
- forming a pair of electrode parts including a first electrode part and a second electrode part to be mounted on a mounting surface by performing metal processing on a metal plate, the metal processing including bending;
- joining the resistor body to each of the first electrode part and the second electrode part such that the resistor body is positioned at a height differing from a height of the mounting surface between the first electrode part and the second electrode part;
- and
- forming a sense terminal and a force terminal by forming the slit in each of the pair of electrode parts, the slit being cut from a non-joined side not connected to the resistor body toward a joined side connected to the resistor body,
- wherein, in the step of forming the sense terminal and the force terminal, at least one of a position of the slit, length of the slit, and width of the slit is adjusted such that a value of a temperature coefficient of resistance that indicates a rate of change in resistance value with respect to temperature change of the shunt resistor is brought to between 10 ppm/° C. and −10 ppm/° C.
Dependencies are inferred from the claim text.