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AssigneePowerware Corporation
InventorsJoseph R. Wade, Glenn A. Koosmann, Donald K. Zahrte, Sr.
Estimating the term…
A charging control circuit for severe battery conditions and an uninterruptible power supply (UPS) system including same are presented. The charging control circuit utilizes both hardware and microprocessor control to allow the UPS to start with depleted or no batteries installed. Initially, the hardware control loops regulate DC bus voltage generation to charge the batteries to a safe level to allow the UPS housekeeping circuitry to wake up and assume control of the UPS operation. Once the microprocessor has awoken, it assumes control of the DC bus and charging of the batteries. If no batteries are installed, the hardware control loop utilizes a fast responding voltage mode control to regulate the DC bus, while a microprocessor-based current mode control is used when batteries are installed. Hardware over voltage control and microprocessor shut off control is also provided.
An uninterruptible power supply (UPS) system, comprising a power module having an input adapted to receive AC mains power, and an output adapted to supply AC power to utilization equipment, the power module having an input controlled rectifier adapted to generate a DC voltage on an internal DC bus and a power inverter coupled to said internal DC bus for generating said AC power on said output, said power module including a hardware control circuit having a first control loop adapted to control said input controlled rectifier to regulate said DC voltage on said internal DC bus at a first safe level below a normal controlled level.
A battery charger control circuit for use in an uninterruptible power supply (UPS) having an input controlled rectifier adapted to supply DC power to an internal DC bus for use by a power inverter to generate output AC power, the input controlled rectifier selectively utilizing AC mains power and battery power to supply the DC power to the internal DC bus, the battery being coupled to the DC bus to receive charging power therefrom when not selectively coupled to the input controlled rectifier to supply power thereto, comprising:
A method of starting an uninterruptible power supply (UPS) having severely discharged batteries upon connection of AC mains power, the UPS including an input controlled rectifier capable of generating a controlled DC voltage on an internal DC bus, the UPS further including a hardware control circuit and a microprocessor control circuit for controlling the input controlled rectifier, comprising the steps of:
Dependencies are inferred from the claim text.