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555 DC isolation converter circuit

2015-01-31 04:12  
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555 DC isolation converter circuit
555 DC isolation converter circuit
As shown on the figure 9-16, this is an isolation circuit that change the 5v DC voltage to the 9v DC voltage. The circuit includes an oscillator,a transformer, a power amplifier, rectifier and steady voltage output circuit. When the input voltage is between 4.5v and 5.5v, the output DC is 9v and the load current is 80mA. The actable multivibrator consists of the 555 and R1,R2,C2. The oscillation frequency: f=1.44/(R1+2R2)C2。It is about 15kHz, the duty ratio is close to 1:1. The VT1 is a power amplifier. The secondary transformer's induced voltage will output 9v DC voltage through the bridge rectifier and three terminal regulator. The full-efficiency can reach 65%.