(EP985261-A1)      The power pack is for supplying power to a load or consumer arranged directly or via a convertor in an unstabilised direct current branch of the power pack. The power pack has a buffer capacitor (C) which can be charged from the dc branch. The buffer capacitor (C) powers the dc branch if the mains fails or is interrupted for more than a predetermined minimum time. The capacitor (C) lies at the voltage (U1) of the dc branch via a high Ohmic charging resistance (R).    A diode (D) is connected in parallel with the resistor (R). This powers the load from the buffer capacitor (C) when the input voltage falls below a minimum level (Um). A voltage limiter (Dz) is connected in parallel with the buffer capacitor (C). This limits the voltage at the capacitor essentially to the minimum voltage of the dc branch to be expected in normal operation.    ADVANTAGE -   Provides simple and inexpensive, reliable and efficient power pack with back up supply in case of failure.    (CN1258391-A)      The power pack is for supplying power to a load or consumer arranged directly or via a convertor in an unstabilised direct current branch of the power pack. The power pack has a buffer capacitor (C) which can be charged from the dc branch. The buffer capacitor (C) powers the dc branch if the mains fails or is interrupted for more than a predetermined minimum time. The capacitor (C) lies at the voltage (U1) of the dc branch via a high Ohmic charging resistance (R).    A diode (D) is connected in parallel with the resistor (R). This powers the load from the buffer capacitor (C) when the input voltage falls below a minimum level (Um). A voltage limiter (Dz) is connected in parallel with the buffer capacitor (C). This limits the voltage at the capacitor essentially to the minimum voltage of the dc branch to be expected in normal operation.    ADVANTAGE -   Provides simple and inexpensive, reliable and efficient power pack with back up supply in case of failure.    (US6157553-A)      The power pack is for supplying power to a load or consumer arranged directly or via a convertor in an unstabilised direct current branch of the power pack. The power pack has a buffer capacitor (C) which can be charged from the dc branch. The buffer capacitor (C) powers the dc branch if the mains fails or is interrupted for more than a predetermined minimum time. The capacitor (C) lies at the voltage (U1) of the dc branch via a high Ohmic charging resistance (R).    A diode (D) is connected in parallel with the resistor (R). This powers the load from the buffer capacitor (C) when the input voltage falls below a minimum level (Um). A voltage limiter (Dz) is connected in parallel with the buffer capacitor (C). This limits the voltage at the capacitor essentially to the minimum voltage of the dc branch to be expected in normal operation.    ADVANTAGE -   Provides simple and inexpensive, reliable and efficient power pack with back up supply in case of failure.