Current sensing is used for control purposes
Why do battery chargers need current sensing? for what?
Why do inverter systems need current sensing?
Why do power supplies need current sensing?
The Current Sensing I have seen or use are milliohm resistors Not using Op amps
The Milliohm resistor is the Sense Resistor or SHunt resistor which is for low side sensing or Direct, sense resistor is in series with the load
My question is how is the milliohm resistor doing current sensing when there is no op amp connected to it?
You can see progress and at which current rate your battery is charged.
In inverter systems current sensing will show production or draining of current rate.
I'm not sure of the correct term either, but it is to prevent thermal runaway. Also, if more than one power transistor is used in parallel, then the emitter resistors help ensure equal current sharing. Common values for audio amplifiers are between 0.1Ω and 0.47Ω.Don't know if I a correct about this but if the small resistor is being used at the emitter of a transistor in a Class AB amplifier it may be for thermal compensation. (don't know if it is called that).
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