PHARPS62200000 Production Description
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ABB PHARPS62200000 Power supply module The AC mains voltage (50/60 Hz) applied at the input side is transformed to a lower level and rectified by a subsequent rectifier. Then, a capacitor C smoothes the output voltage of the rectifier. The dimension of the transformer depends on the desired output voltage. Due to the design of the electric circuit, the output voltage directly depends on the input voltage which in turn means that variations of the mains voltage have direct effect to the output side. Since no regulation is done on the secondary side, the residual ripple of the output voltage is in the dimension of volts and specified as a percentage of the DC output voltage. Due to their simple design, unregulated power supplies are very robust and durable. Their efficiency is approx. 80 %. Unregulated power supplies are primarily used for simple electromechanical applications that do not require exact output voltages, e.g. for the supply of contactors.
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