Battery current indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Proper operation of a car battery is the key to a long service life and normal operation of the entire power supply system. Monitoring the battery charging / discharging mode allows you to take the necessary preventive measures in time, as well as monitor the health of the generator, starter, electrical wiring. Not all cars are equipped with a battery current indicator, and the device described below allows you to fill this gap with simple means.
The indicator (Fig. 7.9) measures the voltage drop on the conductor connecting the negative terminal of the battery to the car body. This conductor is included in the resistive measuring bridge R1 ... R5, which allows you to remove bipolar signals from the bridge and amplify their op-amp with a unipolar supply. Logarithmic diodes VD1...VD1 are included in the negative feedback circuit of the op-amp DA4, which expand the limits of the measured current, allowing you to measure even the current consumed by the starter when starting the engine. The recording device can be any magnetoelectric milliammeter or microammeter having a scale with zero in the middle, for example, M733, with a full deflection current of the needle of 50 μA. It is most convenient to place three marks evenly on the scale to the right and left of zero: 5 A, 50 A and 500 A.
The indicator is powered by a parametric stabilizer for a voltage of 6,6 V. The right terminal of the resistor R5 according to the scheme is left permanently connected directly to the negative terminal of the battery.
To calibrate the indicator scale, it is first supplied with power directly from the battery and the microammeter needle is set to zero with a trimmer resistor R4. Then, with the ignition key turned off (in order to prevent the flow of uncontrolled battery current), the positive terminal of the battery through a powerful (about 60 W) resistor with a resistance of 2,4 ohms is connected to the car body and the trimmer resistor R7 set the arrow to 5 A.
After calibration, the positive power output of the indicator is connected to the positive wire of the vehicle's on-board electrical network. There is no need to check the calibration at a current of 50 A and especially 500 A.
Author: Semyan A.P.
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