CIRCUIT FOR DETERMINING THE OUTPUT POWER OF SWITCHED-MODE POWER SUPPLY

摘要

The present invention relates to a circuit for determining the output power of switched-mode power supply, wherein a charging capacitor is charged using a constant current during the discharge period of a transformer. The voltage applied through the charging capacitor is integrated by a downstream-mounted integration organ. The output voltage of the integration organ is proportional to the average power of the switched-mode power supply. The circuit of the present invention allows for the fact that, when the switched-mode power supply exhibits different operation frequencies, the charging and discharging periods of the transformer may be different even if the output power of the switched-mode power supply remains the same.