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#NICD BATTERY PULSE CHARGER CIRCUIT FULL#
Using a peak voltage detection point of 1.5 V/cell will result in charging to about 97 of full capacity for NiMH and NiCd batteries. Peak voltage detection is used in the constant current regulator (CCR) battery charging circuit shown below. For an LM317, the voltage between the reference lead and the output is 1.25 V, which means at least three cells must be charged (3 × 1.45 V > 2.9 V + 1.25 V). For more critical applications, one or more can be combined in a single charger. This leads to a requirement for a certain minimum number of cells. Both circuits operate simultaneously, and one circuit will generate and end of charge signal when a battery corresponding to its type is fully charged. Separate circuits are provided for sensing an end of charge sequence for both battery types. The potential on the reference lead of the voltage regulator is raised by approximately 2.9 V due to the voltage across the LED. An improved battery charging circuit provides a single circuit for charging both Ni-MH and Ni-Cd batteries. The LED is on if current limiting is active, which also means that the cells are not yet fully charged. The limit is set by the formula Imax ≈ (0.6 V) ÷ R3 For Imax = 200 mA, this yields R3 = 3 Ω. If the cells are not fully charged, a charging current flows freely from the voltage regulator, although it is limited by resistor R3 and transistor T1.
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Circuit diagram II of nickel cadmium battery charger. The operation of the circuit is quite simple. For a 1.2v/1500mah and 150mA rechargeable battery, R1 must be 5.6 ohms, R2 12 ohms, T1 2n2904. In this mode, a higher charging current can be used, with all of the control characteristics remaining the same. If the storage capacitor (C1) is omitted, pulsed charging takes place. Therefore, the transistor 2SC36522 becomes in an ON state and supplies the. The 0.15 Ohms 3W resistor voltage will get 0.7V.
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Because of this, the charging current is regulated to 4 amperes so the charging current gets 4 amperes. This circuit has a built-in automatic current regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a ‘fully charged’ voltage determined by the voltage regulator is reached, and it indicates whether it is charging or has reached the fully charged state. The circuit of the NiCd Battery Charger is shown above. A simple NiCd charger can be built using ‘junk box’ components and an inexpensive LM317 or 78xx voltage regulator.