초록 ▼

The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present invention provides full control of inrush current eve

The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present invention provides full control of inrush current even during cold startup, warm startup, and power line disturbance conditions. The present invention controls inrush current without the need for an extra series dissapative device and its consequent additional losses. The preferred embodiment includes use of the present invention for AC-DC converters having active power factor correction. An alternative embodiment is for use in non-power factor corrected applications.

대표청구항 ▼

1. A method of controlling inrush current in a AC-DC converter when AC power is lost during power line disturbance conditions comprising the steps of:a) Maintaining a plurality of SCRs in an OFF state to limit inrush current when said AC power is lost; b) Comparing the instantaneous AC input voltage

1. A method of controlling inrush current in a AC-DC converter when AC power is lost during power line disturbance conditions comprising the steps of:a) Maintaining a plurality of SCRs in an OFF state to limit inrush current when said AC power is lost; b) Comparing the instantaneous AC input voltage to the DC output voltage of the converter; c) Comparing the instantaneous AC input voltage to a predetermined voltage level; and d) Triggering said plurality of SCRs to the ON state only when said AC power is restored to said predetermined level and the instantaneous input AC voltage is less than the DC voltage at the output of the AC-DC converter.