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Application Notes/
Technical Brief
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DG10
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Title:
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Power Solutions Design Guide
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Name:
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DG10
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Date:
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6/29/06
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Author:
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Microchip Technology Inc
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Description:
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In most power electronic applications, the power input is in the form of a 50 Hz or 60 Hz sine-wave AC voltage provided by the electric utility, which is then converted to a DC voltage.
Increasingly, the trend is to convert the input AC into DC in an
uncontrolled manner, using rectifiers and diodes. As such, the power flow can only be from the utility AC side to the DC side.
A majority of applications such as switching DC power supplies,
motor drives, servo drives, and so on, use such uncontrolled rectifiers. In most of these applications, the rectifiers are supplied directly from the utility source without a 50/60 Hz
transformer. The avoidance of this costly and bulky transformer is important in most modern applications.
In non-power, factor-corrected applications, the DC output voltage
of the rectifier circuit should be as ripple-free as possible.
Therefore, a large capacitor is connected as a filter on the DC
side. This capacitor gets charged to a value close to the peak of
the AC input voltage. The DC link voltage is then converted for
use throughout the system.
This design guide describes basic techniques for converting the
generated DC link voltage for use throughout a system.
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Keywords:
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Related Information
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App Notes and Source Code
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DG10
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