Integrated uninterruptible power supply for personal computers

A DC-to-AC voltage inverter comprising:

• a sine wave reference oscillator operable for producing a sine wave signal from a digitally stored facsimile;
• switching means for switching a DC voltage into an AC voltage and placing said AC voltage on an output;
• control means connected for controlling said switching means in response to said signal received from said sine wave reference oscillator such that said AC voltage is regulated in response thereto;
• and
• said switching means includes dual buck converters arranged in an H-bridge configuration.

A DC-to-AC voltage inverter comprising:

• a sine wave reference oscillator operable for producing a sine wave signal from a digitally stored facsimile;
• switching means for switching a DC voltage into an AC voltage and placing said AC voltage on an output;
• control means connected for controlling said switching means in response to said signal received from said sine wave reference oscillator such that said AC voltage is regulated in response thereto;
• and
• said sine wave reference oscillator is constructed using a clocking means for driving a memory means at a fixed frequency, said memory means programmed for storing said digitally stored facsimile and a digital-to-analog converter for producing said sine wave signal from said digitally stored facsimile.

A method of providing uninterruptible power to a computer and associated peripherals, comprising the steps of:

• (a) sensing AC line voltage for sufficient magnitude;
• (b) converting said AC line voltage to a first DC high voltage;
• (c) series resonant converting said first DC high voltage into low DC voltage for use by the computer if said AC line voltage is sufficient in magnitude;
• (d) series resonant converting battery voltage into said low DC voltage for use by the computer if said AC line voltage is insufficient in magnitude;
• (e) series resonant converting said battery voltage into a second DC high voltage if said AC line voltage is insufficient in magnitude;
• (f) inverting said first DC high voltage into an uninterrupted AC voltage for use by the peripherals if said AC line voltage is sufficient in magnitude;
• and
• (g) inverting said second DC high voltage into an uninterrupted AC voltage for use by the peripherals if said AC line voltage is insufficient in magnitude.

An integrated uninterruptible power supply for computers and associated peripherals, comprising:

• input means for conditioning AC line voltage, for converting said conditioned AC line voltage into a first DC high voltage and for placing said first DC high voltage onto a bus;
• high voltage switch means connected to said bus for producing switched DC high voltage from at least one of said first Dc high voltage and a second DC high voltage;
• low voltage switch means for producing switched DC low voltage from battery voltage received from a battery pack;
• a power transformer haivng a high voltage primary winding connected to said high voltage switch means for receiving said switched DC high voltage and having a low voltage primary winding connected to said low voltage switch means for receiving said switched DC low voltage;
• said power transformer operable in response to receiving one of said switched DC high voltage and said switched DC low voltage for producing on a low voltage secondary winding at least one low voltage output for supplying the computer and for producing on a high voltage secondary winding said second DC high voltage connected for driving said bus;
• said power transformer further including resonant conversion means connected to at least one of said primary windings for performing series resonant conversion;
• inverter means connected to said bus for generating AC output voltage from at least one of said first and said second high DC voltages to supply the peripherals with said AC output voltage;
• and
• control means connected to said high voltage switch means, said low voltage switch means, said bus, and at least one of said secondary windings for enabling said high voltage switch means when said first DC high voltage on said bus is above a first preselected level, for enabling said low voltage switch means when said first DC high voltage on said bus is below a second preselected level, and for controlling said high voltage switch means and said low voltage switch means in response to the voltage on at least one of said secondary windings such that the voltages produced on said secondary windings are regulated.