The system for online AC impedance identification of lithium-ion battery, as shown in Figure 1, is made up of a Lithium-ion battery pack with BMS (Battery Management System), a cell voltage monitor, a shunt resistor
, an electronic load and a DC/DC converter as well as a resistor for its power consumption.
The new device features a low differential input range of +/-50 mV allowing designers to reduce power dissipation across a current-sensing shunt resistor
in servo drive and motor applications.
The principle involves the insertion of a very low resistance in series with the load, resulting in a small voltage drop across this shunt resistor
, which can then be measured
The AD7403 isolated sigma-delta modulator integrates ADI's iCoupler digital isolation technology, creating a single-chip solution for measuring the voltage across a shunt resistor
by converting an analog signal into a 1-bit data stream that can be clocked at up to 20 MHz.
It takes only three passive components--a ceramic bootstrap capacitor, a shunt resistor
, and a second ceramic capacitor at the voltage supply pin--to operate the inverter.
Similarly, the shunt resistor
values at the driver and along the primary signal path are sufficiently high that we consider them to be opens, and thus remove them from the circuit.
An external shunt resistor
is placed on either the device side (b) or the input side (c) of the capacitors to provide a controlled impedance at the device (usually 50 [ohm]).
The system achieves this performance through the use of a motor current reconstruction technique that uses the value of the current through a shunt resistor
at the inverter and simultaneously constructs the motor current with the aid of a microprocessor.
This is required to reduce the AC current magnitude into the shunt resistor
path so that DC current can be measured with a clamp-on ammeter or a voltmeter connected across the known shunt resistor
Tenders are invited for Train Shunt Resistor
Box Made Of 4Mm Abs Material 75 Mm Length, 45Mm Width And 32Mm Height With Three Output Terminal Holes And Printing Matter As Per Drg No S And T/By/F 314.
A Kelvin-connected shunt resistor
provides precisely located contacts for the low-current measurement path, isolating it from cabling parasitic resistances in the high-current path (red).