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The realization of conversion of two different voltages about 110V/220V switching power supply PDF 打印 E-mail
Now a lot of input terminals of switching power supply are equipped with AC 110V/220V selector switch. how to achieve two conversion of different voltage 110V/220V just based on one switch . Most switching power supply input terminals are selected as shown in the input circuit. When the switch is placed in ON state K, which apply to 110V AC voltage. Because when the sinusoidal AC voltage in the positive half cycle, by the D1 diode rectifier, filter capacitor C1 is charged to the peak voltage of 110VAC × (square root of 2) ≈ 150VDC. Similarly, in the negative half-cycle, by the rectifier diode D4, capacitor C2 is charged to 150VDC, so the total output voltage is C1, C2 the sum of the voltage 300VDC (is the superposition of two and a half times the rectifier into.) When the switch K is turned off, diode D1 ~ D4 constitute a full bridge rectifier, the total output voltage is 220VAC × (square root of 2) ≈ 300VDC, so the switch is placed in different positions K 110V and 220V power supply is the role of the same , namely, the achievement of two different voltage 110V/220V selection.    
 
Based on the above analysis, the choice of components, the diode allows the maximum current value, should be at least able to withstand more than twice the maximum input current; consider the peak reverse voltage, the voltage should be 600V or more. Capacitor voltage should be at least 200V or more.
 
Structure shows that the input value of the output capacitor equivalent series C1 and C2 after the capacitance, so by choosing the capacity of the capacitor C, C1 and C2 the value should be 2C, and C the value of the work of the current size of the circuit For, as the power should be determined.
 
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