Wiring substrate and current detection device
A wiring board and current detection circuit technology, which is applied in the direction of measuring devices, voltage/current isolation, and measurement of current/voltage, can solve the problem of reduced welding strength, inability to accurately detect shunt resistance potential differences and detected currents, Solder cracks and other problems to achieve the effect of improving welding strength
Inactive Publication Date: 2008-10-29
OMRON AUTOMOTIVE ELECTRONICS CO LTD
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Problems solved by technology
[0011] Normally, both ends of the shunt resistor are soldered to the bonding area of the substrate, but when a crack occurs in the solder between the shunt resistor and the wiring pattern, the wiring path for detecting the current to be detected changes, and the wiring path The change of the resistance value of the resistor cannot accurately detect the potential difference of the shunt resistor and the detected current
In particular, as in Patent Documents 1, 3, and 4, if the area of the bonding region is slightly larger than the area of the surface where the shunt resistor contacts the bonding region, the fillet (handa filet) formed by the shunt resistor across the bonding region will be reduced. Small, reduced welding strength, prone to solder cracks
Method used
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[0065] FIG. 1 is a diagram showing a current detection device 100 of this embodiment. The current detection device 100 is constituted by, for example, an ECU (Electronic Control Device) used in an electric power steering system of a motor vehicle. The current detection device 100 includes a microcomputer (hereinafter referred to as "microcomputer") 1, a motor drive circuit 2, a current detection circuit 7, a shunt resistor 8, and the like. The microcomputer 1 inputs the steering torque detected by the torque sensor 4 and the vehicle speed (running speed) of the motor vehicle detected by the vehicle speed sensor 5 via the connector C and wiring. Power is supplied from the battery 3 to the microcomputer 1 and the motor drive circuit 2 via the connector C and wiring.
[0066] The motor drive circuit includes: an H bridge circuit composed of four FETs, an FET gate drive circuit, and a boost power supply. The electric motor 6 is constituted by an electric motor. The electric motor 6 is...
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An object of the present invention is to provide a wiring substrate capable of accurately detecting a potential difference in a shunt resistor and a current to be detected without being influenced by soldering, and a current detection device. A land mounted with a rectangular surface at each end of a shunt resistor is configured by first and second lands each having a rectangular portion and being arranged at a predetermined interval with a central line as a center, and third and fourth lands each having an area smaller than those of the first and second lands and being arranged at one end of the first and second lands to be connected respectively to the first and second lands.; A wiring pattern for detecting a potential difference between the both ends of the shunt resistor is configured by a first wiring pattern connected to the third land and pulled out from the third land towards the fourth land, a second wiring pattern connected to the fourth land and pulled out from the fourth land towards the third land, and third and fourth wiring patterns connected respectively to the first and second wiring patterns and pulled out into one direction.
Description
Technical field [0001] The present invention relates to a circuit board equipped with a shunt resistor for current detection, and a current detection device having the circuit board. Background technique [0002] Conventionally, a shunt resistance is incorporated in the circuit midway through a line through which current flows, and the current is detected based on the voltage drop caused by the shunt resistance. For example, in the following Patent Document 1, two junction areas at both ends of the welding shunt resistance are provided on a substrate, and a voltage measurement drawn from the end of each junction area on the side perpendicular to the direction of current flow to be detected is provided. With the wiring pattern, the voltage difference at the terminal portion of each wiring pattern is detected by the current detection circuit, and the detected current is calculated from the voltage difference and the current conversion table. As a current detection circuit, it has t...
Claims
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IPC IPC(8): G01R15/14G01R19/00
CPCG01R1/203H05K2203/167H05K2201/09381H05K3/222H05K2203/0465H05K2201/09281H05K3/3421H05K2201/09909H05K1/111Y02P70/50
Inventor 长岛笃史
Owner OMRON AUTOMOTIVE ELECTRONICS CO LTD