Contents
Where does the sense of current come from?
Current sensed in the ground return path of the power connection to the monitored load. Current generally flows in just one direction (unidirectional). Any switching is performed on the load-side of monitor. Figure 1. Low Side Current Sensing.
How does high side current sensing circuit work?
High-Side Current Sensing. As shown in Figure 2, high-side current sensing connects the sensing resistor between the power supply and load. The sensed voltage signal is amplified by subsequent op amp circuits to get the measurable VOUT.
How are current sensing problems used in electronics?
Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the techniques to do so are as diverse as the applications themselves. This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type.
How is a current sensing resistor converted to voltage?
Among these sensors, a current sensing resistor is the most commonly used. It can be considered a current- to-voltage converter, where inserting a resistor into the current path, the current is converted to voltage in a linear way of V = I × R.
How does the LTC6101 make sense of current?
Adding two external MOSFETs to hold off the voltage allows the LTC6101 to connect to very high potentials and monitor the current flow. The output current from the LTC6101, which is proportional to the sensed input voltage, flows through M1 to create a ground referenced output voltage.
How does an an-105 circuit make sense of current?
The upper circuit (a) uses an instrumentation amplifier (IA) powered by a separate rail (>1V above V IN) to measure across the 1kΩ current shunt. The lower figure (b) is similar but derives its power supply from the APD bias line. The limitation of these circuits is the 35V maximum APD voltage, whereas some APDs may require 90V or more.
Is the lt6100 a high side current sensor?
Self-Powered High Side Current Sense. The LT6100 can be used as a combination current sensor and fuse monitor. This part includes on-chip output buffering and was designed to operate with the low supply voltage (≥2.7V), typical of vehicle data acquisition systems, while the sense inputs monitor signals at the higher battery bus potential.