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A car audio amplifier circuit study

2015-01-03 09:26  
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This article describes the car audio amplifier circuit. As long as Duokanjibian The schematic can master the principles of it. This circuit is for technical exchanges. This is a typical push-pull design, take care to get the best symmetry (to avoid flux walking). Remember, this circuit will adsorb many amperes (about 10 a) so be careful enhance the power tracks with lots of solder and use heavy wires from the battery or the voltage will drop too much input. Transformers must be designed to reduce the skin effect, which can be insulated by using some of the coil wire, single wire welded together, but separately. Required to do two transformer turns ratio and different duty cycles. In my example, I use 5 5,10 10 rounds to get speedup 2 (12 -> 24) and downregulating voltage through the work cycle of 20 executed dynamically adjust TL494  PWM controller.
In a boost to be a little higher than overcome diode losses, winding resistance and so on and the input voltage drops due to wire resistance from the battery to the converter. Transformer must be the correct size to carry the required power, the Internet has many chart showing a strong force in the function of frequency and core size for a given topology. Windings, especially in the main to weight determination, but the use of a single use of multiple parallel lines are preferably insulated from each other except connection end. This will reduce the resistance increase due to skin effect. Primary winding and a secondary winding centertapped, which means you have to wind 5 turns, again centertap and 5 windings. Similarly, the second, 10 rounds, then centertap and 10 rpm. Very important point is that the transformer must be no air gap or peak leakage inductance will throw the switch overheated, so that voltage is higher than the expected forecast turns ratio, so if your voltage output (at full duty cycle) above text * N2 / N1 - Vdrop diodes, transformers, there is a gap (of course, let me say you, you are blind if you missed it), which was accompanied by a drastical efficiency. Use of non-core or chipped E toroids (ferrite). The circuit uses a field-effect transistor is driven TPS2811P, from Texas Instruments, rated 2 a peak and 200 ns. It is important, the gate driver optimized minimum inductance and switching losses will be higher, you risk noise coupling from other sources. Personally, I think, twisted pair wire (gate and ground / source) is the best kept inductance. The gate drive resistors Mosfet, not close to the IC.

 

 

Automotive converter

=================
Design: 12V to 20V 100W DC-DC conv
Doc. no.: 1
Revision: 3
Author: Jonathan Filippi
Created: 29/04/05
Modified: 18/05/05

Parts List
— ——— —–
Resistors
———
2?? R1,R2 = 10
4?? R3,R4,R6,R7 = 1k
1?? R5 = 22k
1?? R8 = 4.7k
1?? R9 = 100k

Capacitors
———-
2?? C1,C2 = 10000uF
2?? C3,C6 = 47u
1?? C4 = 10u
3?? C5,C7,C14 = 100n
2?? C8,C9 = 4700u
1?? C12 = 1n
1?? C13 = 2.2u

Integrated Circuits
——————-
1?? U1 = TL494
1?? U2 = TPS2811P

Transistors
———–
2 Q1,Q2 = FDB045AN

Diodes
——
4?? D1-D4 = 1N5822
1?? D5 = 1N4148

Miscellaneous
————-
1?? FU1 = 10A
1?? L1 = 10u
1?? L2 = FERRITE BEAD
1?? RV1 = 2.2k
1?? RV2 = 24k
1?? T1 = TRAN-3P3S

 


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