Patent ID: 8732507
Filing Date: 2014-05-20
Classification: G06F,H02J

Abstract:
1. A circuit for uninterruptible power supply, which can be connected to an energy supply and a load, and comprises a capacitive energy store connected to the energy supply, a changeover switch connected to the energy supply and the capacitive energy store, said changeover switch being designed, if a first predetermined voltage drop occurs when a voltage is applied via the energy supply, to change over from supplying the load with energy via the energy supply to supplying the load with energy from the capacitive energy store, a charging device connected between the energy supply and the capacitive energy store and serving for charging the capacitive energy store, a charging control device connected to the capacitive energy store and the charging device, said charging control device being designed to monitor the capacitive energy store by evaluating a voltage of the capacitive energy store and to switch off the charging device when a fault is ascertained, a voltage monitoring device connected to the energy supply and serving for determining and signaling in the form of a fault signal if a second predetermined voltage drop occurs when the voltage is applied via the energy supply, said second predetermined voltage drop being less than the first predetermined voltage drop and a discharge device connected between the capacitive energy store and the changeover switch and connected to the voltage monitoring device, said discharge device being designed, when the fault signal of the voltage monitoring device is present, to be switched into an active mode, wherein in the active mode the discharge device applies the energy from the capacitive energy store to the changeover switch to make available to the changeover switch the energy required for supplying the load by means of discharging the capacitive energy store.