Systems and methods for producing standby uninterruptible power for AC loads using rectified AC and battery
First Claim
1. A standby Uninterruptible Power Supply (UPS) comprising:
- means for rectifying an alternating current (AC) utility input voltage to produce a rectified voltage;
a battery that produces a direct current (DC) voltage;
means for activating the DC voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and
means for connecting the rectified voltage and the standby DC voltage to an AC load that includes input rectification such that the rectified voltage is applied to the AC load that includes input rectification when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load that includes input rectification in response to the predetermined change in the AC utility input voltage.
3 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for producing standby uninterruptible power for an AC load rectify an AC utility input voltage to produce a rectified voltage and activate a DC battery voltage in response to a change in the AC utility input voltage to thereby produce a standby DC voltage. The rectified voltage and the standby DC voltage are connected to an AC load that includes input rectification to thereby produce standby uninterruptible power without the need for costly, bulky, and/or unreliable inverters or converters. Seamless transfer of power may be provided to support the AC load upon failure of the AC utility input voltage and upon restoration of the AC utility input voltage. The AC utility input voltage is preferably rectified by a diode rectifier, most preferably a full-wave diode rectifier including at least four diodes, to produce the rectified voltage. A diode switch is used to activate the DC voltage from the battery in response to a change in the AC utility input voltage to thereby produce the standby DC voltage. The diode switch may include a separate diode and an electronic or electromechanical switch. Alternatively, the diode switch may be a single element such as a thyristor. The diode rectifier and the diode and switch are connected in a diode-OR connection that provides the standby uninterruptible power for the output of the UPS. The diode-OR connection allows the strongest source to support the AC load at all times.
62 Citations
62 Claims
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1. A standby Uninterruptible Power Supply (UPS) comprising:
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means for rectifying an alternating current (AC) utility input voltage to produce a rectified voltage; a battery that produces a direct current (DC) voltage; means for activating the DC voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and means for connecting the rectified voltage and the standby DC voltage to an AC load that includes input rectification such that the rectified voltage is applied to the AC load that includes input rectification when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load that includes input rectification in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of producing standby uninterruptible power for an AC load that includes input rectification, comprising the steps of:
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rectifying an alternating current (AC) utility input voltage to produce a rectified voltage; activating a direct current (DC) battery voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and connecting the rectified voltage and the standby DC voltage to the AC load that includes input rectification such that the rectified voltage is applied to the AC load that includes input rectification when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load that includes input rectification in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A standby Uninterruptible Power Supply (UPS) that produces uninterruptible power at the output thereof, comprising:
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a rectifier that rectifies an alternating current (AC) utility input voltage to produce a rectified voltage; a battery that produces a direct current (DC) voltage; and a switch that is connected to the battery to produce a standby DC voltage from the battery in response to a predetermined change in the AC utility input voltage, the rectifier and the switch being connected to the output of the UPS to thereby provide the rectified voltage and the standby DC voltage at the output of the UPS such that when the output of the UPS is connected to an AC load, the rectified voltage is applied to the AC load when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of producing standby uninterruptible power for an AC load at an output node, comprising the steps of:
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rectifying an alternating current (AC) utility input voltage to produce a rectified voltage; activating a direct current (DC) battery voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and connecting the rectified voltage and the standby DC voltage to the output node such that when the output of the UPS is connected to an AC load, the rectified voltage is applied to the AC load when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A standby Uninterruptible Power Supply (UPS) that provides standby uninterruptible power at the output thereof, comprising:
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a diode rectifier that rectifies an alternating current (AC) utility input voltage; and a battery and a diode switch that are serially connected to the diode rectifier in a diode-OR connection, the diode switch being responsive to a predetermined change in the AC utility input voltage, the diode-OR connection providing the standby uninterruptible power for the UPS at the output thereof such that when the diode-OR connection is connected to an AC load, the diode rectifier supplies rectified AC utility input voltage to the AC load when the AC utility input voltage is operational and the battery is applied to the AC load in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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36. A standby UPS according to claim 36 wherein the diode rectifier comprises a full wave diode rectifier.
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44. A method of controlling a standby Uninterruptible Power Supply (UPS) that includes a diode rectifier that rectifies an alternating current (AC) utility input voltage, and a battery and a diode switch that are serially connected to the diode rectifier in a diode-OR connection, the method comprising the steps of:
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sensing a change in the AC utility input voltage; waiting for a first predetermined time; activating the diode switch after the first predetermined time if the sensed change in the AC utility input voltage persists; sensing for restoration of the AC utility input voltage; waiting for a second predetermined time that is substantially longer than the first predetermined time; and deactivating the diode switch after the second expiration time if the sensed restoration in the AC utility input voltage persists. - View Dependent Claims (45, 46, 47, 48)
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49. A standby Uninterruptible Power Supply (UPS) comprising:
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means for rectifying an alternating current (AC) utility input voltage to produce a rectified voltage; a battery that produces a direct current (DC) voltage; means for activating the DC voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and means for producing at least one DC operational voltage for a load from the rectified voltage and the standby DC voltage such that when the DC operational voltage is connected to an AC load, the rectified voltage is applied to the AC load when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56)
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57. A method of producing standby uninterruptible power, comprising the steps of:
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rectifying an alternating current (AC) utility input voltage to produce a rectified voltage; activating a direct current (DC) battery voltage in response to a predetermined change in the AC utility input voltage to thereby produce a standby DC voltage; and producing at least one DC operational voltage for a load from the rectified voltage and the standby DC voltage such that when the DC operational voltage is connected to an AC load, the rectified voltage is applied to the AC load when the AC utility input voltage is operational and the standby DC voltage is applied to the AC load in response to the predetermined change in the AC utility input voltage. - View Dependent Claims (58, 59, 60, 61, 62)
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Specification