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High Performance Power Amplifier Circuit

2014-11-24 06:10  
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High Performance Power Amplifier Circuit
As shown in figure is a high performance power amplifier circuit.It has a feature of small volume,high-power and high-efficiency.Principle of work:AC power is divided into two parts through filtering by T1.One of them is used to reduce voltage of transformer T3.In Primary windings of T3 there is a bidirectional thyristor KS,which is used to change primary AC power of transformer T3.The other one is rectified after voltage reduction by capacitor C1 and provides trigger control circuit with DC working voltage after voltage regulation by VD1.R3、C3、VQ3 and transformer T2 form a oscillating relaxation circuit.R2、R4 and VQ1、VQ2 constitute current supply and offer constant-current charge to capacitor C3.When voltage of C3 reaches the puncture voltage of VQ3,C3 will discharge through the emitter、base of VQ3 and primary coil of transformer T2.And,C3 will get triggering pulse of thyristor KS at the secondary end of transformer T2 and make thyristor conductive, make transformer T3 running.At the secondary end of transformer T3,C3 gains the required positive and negative symmetrical DC voltage of a power amplifier by rectifying and filtering.