Contents
Why do we need high side current sensing?
In motor-control configurations (Figures 2 and 3), placing the shunt on the motor phase means that current in the shunt resistor could flow both ways; therefore, a bidirectional current sensor is necessary. The designer who studies the choices for the high-side current-sensing function will find a variety of options from many semiconductor vendors.
Which is the best sensor for isolated current measurement?
The PCB Rogowski sensor is advantageous for isolated current measurement due to its very high bandwidth of 20 MHz and fast settling time of 50 ns. The auto-zeroing, 12-nV/√Hz noise density of the INA188 makes it suitable to achieve a 12-bit system resolution for a full-scale current of 1000 A.
What happens to the inductance of Hall effect sensor?
If the current is high, the inductance become lower, if the current is low, the inductance become high. The Hall Effect sensor works similarly to the fluxgate sensor, but there is one difference between them. The difference is in the core material.
What is the saturable inductor in fluxgate sensor?
A saturable Inductor is the main component for the Fluxgate sensing technique. Due to this, Fluxgate sensor is called as Saturable Inductor Current Sensor. The inductor core which is used for the fluxgate sensor works in the saturation region.
Which is an amplifier for high side current sensing?
High-side current sensing is a pervasive requirement in automotive, telecom, consumer, and industrial applications. Integrated high-voltage difference- and current-sense amplifiers are now offered in the marketplace to perform this function.
When do you need a current sense amplifier?
Current-sense amplifiers with this architecture are generally useful only if input common-mode voltage remains above 2 V or 3 V, and if the application doesn’t require that the input common-mode voltage go all the way to ground (or below).
How are high side shunts used in motor control?
High-side shunt in typical solenoid control. Figure 2. High-side shunt in H-bridge motor control. Figure 3. High-side shunts in 3-phase motor control. In all configurations shown above, the pulse-width-modulated (PWM) common-mode voltage at the shunt resistor—which monitors the load current—is swinging over the whole range from ground to battery.