UPS circuit with LM3524D

Published:2011/5/14 23:24:00 Author: | Keyword: LM3524D, UPS circuit | From:SeekIC

LM3524D is a kind of switch power supply controller which uses PWM operate mode. In the working mode, the pin 12 and pin 13 of LM3524D output pulse signals with the phase difference of 180°, whose voltages are amplified through VT1 and VT2 and then the electric currents are stimulated to be amplified by VT3 and VT4. As a result, both of the two processes drive the VT5 and VT6 to amplify the power of the pulse signals. The power amplifier VT5 and VT6 generates 12V square AV voltages on the one side of T2 transformer according to the alternating of the pulse signals outputting by VT1 and VT2.between turning on and turning off. After being stepped up, the square AV voltages are changed to 220 V AV voltages and are output through the other side of the transformer T2, which offer power supply for the load. The operating frequency of this circuit is decided by R2 and C1.VD2 and VD3 in this circuit is used to prevent the power amplifier from flowing through the current with a opposite direction.



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