500W Subwoofer Power Amplifier Design Using Class D Technology
With active subwoofers demanding typical power up to 500W, the construction of amplifiers to meet the requirement is not without difficulties. Consider using a class AB amplification efficiency of 50%, it is clear designs will produce masses of heat, are very large, heavy and expensive. While Class D amplifiers help – more efficiency levels greater than 90% – that they are usually in an open loop to use means that overlap the power limits of the other.
In open-loop mode, it affects the noise generated by power, what you hear – there is no rejection of the offer. This means that the supply of Class D, much smaller than the Class AB design, must be well regulated and low output impedance – and therefore expensive. In addition to maintaining low THD + N, their attention should be paid to the design of the bridge. Caution is to be taken in controlling the dead time distortion with dissipation in the bridge balance.
Consider then a closed-loop Class D amplifier. The addition of a feedback loop has a very positive impact on the performance of our 500W subwoofer and simplifies the design process.
Food can be a switching power supply base will now be used – or an unregulated power supply – the topology of the comments for the noise power. In this case you 4 ? one 500W power supply + /-35V with a peak power needs of 17.5 A.
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