초록 ▼

An uninterruptable power supply controlled by a digital signal processor. The digital signal processor periodically senses an input current, an input voltage, a battery current, a battery voltage boost circuit, first and second DC bus voltages, an output current and an output voltage. The digital si

An uninterruptable power supply controlled by a digital signal processor. The digital signal processor periodically senses an input current, an input voltage, a battery current, a battery voltage boost circuit, first and second DC bus voltages, an output current and an output voltage. The digital signal processor controls an AC to DC conversion unit, a battery charger, a battery voltage boost circuit and a DC to AC inverter via an inner current loop and an outer voltage loop. The digital signal processor calculates the inner current loops each predetermined time interval and calculates the outer voltage loops every two predetermined time intervals. The digital signal processor preferably alternately senses a first group of signals consisting of the input voltage, the input current, the output voltage and the output current and a second group of signals consisting of the battery voltage, the battery current, the first DC bus voltage and a second DC bus voltage. The timing of the input signal sensing and the respective current loop and voltage loop calculations are timed by one or more repetitive interrupt timers.

대표청구항 ▼

[ What is claimed is:] [1.] An uninterruptable power supply comprising:an AC to DC conversion unit receiving an AC power input and generating a DC voltage on a DC bus;a battery;a battery charger connected to said DC bus and said battery for charging said battery from said DC bus when receiving AC po

[ What is claimed is:] [1.] An uninterruptable power supply comprising:an AC to DC conversion unit receiving an AC power input and generating a DC voltage on a DC bus;a battery;a battery charger connected to said DC bus and said battery for charging said battery from said DC bus when receiving AC power;a battery boost circuit connected to said DC bus and said battery for supplying electric power on said DC bus from said battery when not receiving AC power;a DC to AC inverter connected to said DC bus for generating AC power for a load from said DC bus; anda digital signal processor connected to said AC to DC conversion unit, said battery charger, said battery boost circuit and said DC to AC inverter, said digital signal processor programmed toperiodically sense an input current, an input voltage, a battery current, a battery voltage, a first DC bus voltage, a second DC bus voltage, an output current and an output voltage,control said AC to DC conversion unit to present a stable input power factor to the AC power input via an inner current loop dependent upon an input current and an outer voltage loop dependent upon an input voltage,control said battery charger upon receipt of AC power via an inner current loop dependent upon a battery current and an outer voltage loop dependent upon a difference between a battery voltage and a first DC bus voltage,control said battery boost circuit upon failure of AC power via an inner current loop dependent upon said battery current and an outer voltage loop dependent upon a difference between said battery voltage and said first DC bus voltage,control said DC to AC inverter to supply stable AC power via an inner current loop dependent upon an output current and an outer voltage loop dependent upon an output voltage;calculate said inner current loops in said controlling of said AC to DC conversion unit, said battery charger, said battery boost circuit and said DC to AC inverter each predetermined time interval, andcalculate said outer voltage loops in said controlling of said AC to DC conversion unit, said battery charger, said battery boost circuit and said DC to AC inverter every two predetermined time intervals.