Battery Charger / Power Supply 14V / 4A with MOSFET VN64GA

Battery charger or Power Supply 14 volt 4 ampere

As the the title, this circuit can function as a power supply or a battery charger. This  Battery Charger / Power Supply circuit has a voltage output of 14 volts and can supply current up to 4 amperes.


Operational amplifier A1 CA3140 directly drives the N-Channel MOSPOWER VN64GA with the error signal to control the output voltage . Peak rectifier D1, C1 supplies error amplifier A1 and the reference zener. This extra drive voltage must exceed its source voltage by several volts for the VN64GA to pass full load current. The output voltage is pulsating DC, which is quite good enough for battery charging. To transform the system to a regulated do supply, capacitor C2 is increased and another electrolytic capacitor is added across the load. The response time is very fast, determined by the op amp. The 2N4400 current-limiter circuit prevents the output current from exceeding 4.5 A. However, maintaining a shorted condition for more than one second will cause the VN64GA to exceed its temperature ratings. A generous heatsink, on the order of 1 °C/w, must be used.

Parts list :
R1 : 51 ohm
R2 : 150K/2W
R3 : 0.15ohm/2W
R4 : 680 ohm
R5 : 10K
R6 : 10K
VR1 : 5K
C1 : 50uF/50V
C2 : 1000uF
C3 : 750pF
C4 : 0.01uF
D1,D2 : 1N4002
D3 : 1N249
D4 : 1N4100
T1 : VN64GA
T2 : 2N4400
A1 : CA3140 or LM324


Tags: 14 volt Power Supply 4 ampere Battery charger CA3140 LM324 power supply circuit

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