| 摘要 |
A system and method is provided to determine input power of a power supply using an input section by dividing input section output power by an efficiency value of the input section. Measurements of operating parameters are obtained through sensing devices that may be previously provided to avoid increased expense and complexity associated with the addition of a current sensing device. The input section maybe a rectifier or PFC stage. Input section output power can be determined by measuring current in a downstream DC/DC converter or converters. The current drawn by the DC/DC converter(s) is used as the output current of the input section to determine output power of the input section. The efficiency value is obtained for an operating point of the input section based on operating parameter values, as indicated in a lookup table or algorithm providing the efficiency values. The calculated input power may also be used to determine input RMS current for the power supply.
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