DC-to-DC charger with voltage boost. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The device is a small, economical DC-to-DC converter with voltage boost. The main area of application of such devices is the power circuits of various electronic devices, cell phone chargers from standard AA or AAA cells, when the dimensions of the device or other technical reasons do not allow assembling a battery of cells for the required voltage. The current in the secondary circuit can be up to 300-400 mA.
(click to enlarge)
The efficiency of the device is within 80%, which is a good indicator for such devices. It should be noted that the efficiency of the device increases with a decrease in the difference between the input and output voltage.
If the device is supposed to be used as a charger, then before starting the manufacture of the device, it is necessary to calculate the voltage at the end of the charge and the charge current. In short: the output voltage value is calculated according to the principle of 1.45 V multiplied by the number of battery cells. The charge current value is defined as 1/10 of the battery capacity in Ah.
Such parameters are considered optimal, do not harm the battery, make it possible to carry out up to 700 cycles (charge - discharge) with batteries while maintaining their parameters in the norms declared by manufacturers. True at ambient temperatures up to 25°C. At higher temperatures, certain precautions must be taken to prevent the temperature from exceeding 35°C during charging.
The value of the required output voltage is set by selecting the tuning resistor R4. LED D2 indicates the presence of the charge current. The output voltage at the existing ratings of the elements can be increased up to 9 volts.
See other articles Section Chargers, batteries, galvanic cells.
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