The circuit is designed to have the best performance with current components and quality, but at the same time as simple as possible and to be used in different applications such as solar or reducing voltages on 24V vehicles. The circuit begins with DC 24V power connector CN1, CN2 and the diode D1, the D1 is a protection against neglect by reversing the polarity. What is a regulator of type 7812, this circuit provides a fixed voltage of +12 V to power the IR2111 driver and the PWM module and temperature control.

The PWM module is responsible for providing the square wave pulse width modulated (PWM) on outputs S1, S2, this signal is proportional to the present intention in VSF points output circuit (output voltage source) and the entry module, these points are the positive feedback loop of the module, setting out the intention is achieved by varying the value of the trimmer P1 in the PWM module.

The temperature control module is responsible for maintaining the temperature of power MOS-FET and the circuit to an acceptable operating temperature, this control also reduces consumption and noise of the fan stopped keeping track when not necessary to its operation.

The amplifier is built around a driver for MOS-FET IR2111, this component contains within it everything necessary to drive and control in so -BRIDGE HALF the power MOS-FET. PWM signal enters the module pin (2) of IC1 by two diodes that mix the two output signals S1, S2 and the balancing resistor R3, the resulting signal is a square wave with a fixed frequency of 70kHz modulated width from 0% to a maximum of 98% depending on the intention +12 V.esta output square wave signal is amplified by the power stage T1, T2, T3, is filtered by the inductor L2, built with a core ferrite toroidal high value type, this type is used very often in the power supplies switched to filter the type of outings and intentions as far as possible eliminate the AF component (high frequency) of the ongoing intention of leaving the source. After the intention L2 is rectified by a group of diodes D10, D11 high-performance type Schottky , diode cough is characterized by low internal resistance and high operating frequency to be suitable for applications in switching power supplies. To finish is filtered and stabilized by two capacitors electrolytic C10 , C11. The end result is a power supply voltage quality and very stable.

COMPONENTS

CONDENSADORES

C1 = 220 uF 35V

C2, C3, C7, C12 = 100nF

C4 = 10uF 35V

C5 = 63V 6800uf

C6 = 100uF 35V

C8 = 2Uf 250v

C9 = 1uF 100V

C10, C11 = 3300 uF 25V

RESISTANCE

R3, R7 = 1k 1/4W

R4, R5, R6 = 22 1/4W

SEMICONDUCTORS

VR1 = UA 7812

INTEGRATED REGULATOR +12 V

D1 = BY255

RECTIFIER DIODE 3A

2, D5, D6 = UF4002
DIODE FAST 1A
D3.D4, D8 = 1N4148

SMALL SIGNAL DIODE FAST

D7, D9, D14 = UF4006

DIODE FAST 1A

D10, D11 = STPS4045CW

DOUBLE DIODE Schottky

45V 40A

IC1 = IR2111

FOR MOS-FET DRIVER

T1, T2 = APT10M25BVR

MOS-FET 100V 70A

T3 = IRL2203

MOS-FET 30V 116A

Sundry liabilities
F1 = 30A

CAR FUSE 30A
L2 = 100UH 25A SHOCK

3 WINDINGS DOUBLE GLAZED FOR 1.2mm WIRE CORE TYPE ON

ARISTON BLS1/NTF311

Detail of part of the track in the PCB where you can see components T3, R6, D8 Bridge heat sink and T3 that are welded directly to printed circuit track.

Picture where you can see the reinforcements made with tin to copper traces on the printed circuit to withstand the large currents flowing through them.

Picture of the completed circuit and testing it.