What is low-side current sensing?
Low-side current sensing is when the voltage is measured across a sense resistor that is placed between the load and ground.
What is high-side and low-side current sensing?
High-side versus low-side current sensing When monitoring load current the designer can choose to place the sense resistor either between the supply voltage (Vbus) and load, or between the load and ground. The former is called high-side sensing whereas the latter is called low-side sensing.
What is high-side current-sense?
High-side current sensing is used in a wide range of applications such as battery chargers or overcurrent protection. Figure 1 displays a typical high-side current sensing schematic. The shunt resistor, Rshunt, is placed between the bus voltage and the system load.
How do you do current sensing?
The most common way to measure current is to sense the voltage drop across a shunt or current-sense resistor. To achieve a highly accurate measurement of the current, you’ll need to examine the parametric values of both the resistor and current-sense amplifier.
What is current sensing circuit?
A current sensor circuit is a circuit that can measure the current flowing through it. Current sensor circuits are used extensively in systems such as battery management systems in order to detect the current to monitor for overcurrent, a short circuit, and the state of charge of the battery system.
What is Hall effect current sensor?
A hall effect current sensor allows non-contact detection of direct and alternating currents, using a hall element, a magnet-electric converting element. This minimizes power loss of the target current circuit and has a simple structure with high reliability.
What is ACS712 current sensor?
ACS712 is a current sensor that can operate on both AC and DC. This sensor operates at 5V and produces an analog voltage output proportional to the measured current. This tool consists of a series of precision Hall sensors with copper lines.
Why is current sensing important?
Naturally, different devices need differing amounts of electricity so they can function properly—and more importantly, not get damaged from receiving too much power. This is why current sensing is such an important element of the power supply chain.
How accurate are Hall effect sensors?
Regarding accuracy, currently available Hall effect sensors can achieve output error as low as 1%. A well-designed resistive current-sense circuit could surpass this, but 1% would generally be adequate in the high-current/high-voltage applications for which Hall effect devices are particularly suitable.
How accurate is ACS712?
The ACS712 is very inaccurate. It is a little noisy, but it is also very sensitive for magnetic fields caused by wires, transformers, and so on. You can never get 16 bits accuracy. That is not isolated from the current (the ACS712 is), and the accuracy is only 1% and you want 0.0015% for 16 bit (or 0.024% for 12 bit).
Can ACS712 work with 3.3 V?
The “-” goes to the power source and the “+” goes to the load to get a positive flow. So that explains the LOWER (than 2.5v) voltage instead of higher than 2.5V. The ACS712 can be made more sensitive with an amplifier (see this product) on its output and can be made to output a 3.3V max.
What is sensitivity of current sensor?
Current sensors provide sensitivity down to 26.7mV/A.
What will be the typical range of a current sensor?
Inductive sensors are designed to measure AC power and typically operate between 20 Hz and 100 Hz, although some units will work in the kilohertz range.