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Company Logo NXP Semiconductors

  • Low-loss Car Battery Charger

  • Created: Sep 08, 2014

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Car battery contains electrolyte chemicals that release hydrogen gas during usage. Hydrogen gas is volatile and has been known to explode under certain conditions, causing serious injuries. For example, a car battery may explode while starting the car, while jump-starting or by carelessly shorting the terminals with a screwdriver. In fact, under certain conditions a car battery may explode while just sitting in a parked car or on a table.

The circuit comprise of a NCX2200 single low voltage, low power comparator. The NCX2200 has a very low supply current of 6A, guaranteed to operate at a low voltage of 1.3V and is fully operational up to 5.5V which makes this device convenient for use in both 3.0V and 5.0V systems.

A transformer and rectifier perform the basic charge without any control through transistors or thyristors, which can accept any current from 4 to 6A. The direct charge is very efficient, as only the inevitable losses of the transformer and rectifier are involved. To further get the losses down, the silicon bridge rectifier is replaced with a Schottky diode. For the transformer, a cut-band core transformer or a ring core transformer can be employed.



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