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Accurate high side current sensing is essential for automotive control systems such as electric power steering automatic gear shifting transmission control engine fuel injection control valve control in braking and active suspensions.
Motor current sensing ic. Current sense amplifiers 4 texas instruments chapter 1. Shunt resistors are popular current sensors because they provide an accurate measurement at a low cost. They provide information to control current in power systems and avoid overheating and short circuits. The breadboard schematic of the above circuit is shown below.
These sensors are automotive grade devices that can take the heat and deliver highly accurate open loop current sensing in the harshest applications environments. All of these applications require precise regulation of the current through a motor or solenoid to control either the torque of the motor or the. Hall effect current sensors are widely used because they provide a non intrusive measurement and are available in a small ic package that combines the sensor and signal conditioning circuit. So the lm741 chip is an 8 pin.
Our high current sensor ic packages are fully integrated solutions that also provide high accuracy and reliability. The simplest i v converter is a resistor. Current sensing overview how integrated resistor current sensors simplify pcb designs the most common way to measure current is to sense. Current sensor circuit shown from the lm741 ic.
One method is simply to purchase a current sensing ic however the same functionality can be achieved with a few common components. Current sensing overview chapter 1. However the terminal resistance of a miniature motor is very low typically just a few ohms. The current sensor circuit that we will build is shown below.
We only connect 5 out of the 8 pins.
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