Power supply method of a line interactive UPS and the line interactive UPS
First Claim
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1. A power supply method of a line interactive uninterruptible power supply (UPS) comprising the steps of:
- providing a first switching unit to be coupled between a line voltage and a bi-directional AC/AC converter, wherein the first switching unit hasa first input terminal and a second input terminal respectively coupled to the line voltage; and
two output terminals;
providing a switching means to be couple to the first switching unit, the bi-directional AC/AC converter and a load, wherein the load has two ends;
determining an operating mode of the line interactive UPS from a by-pass mode, a line voltage conversion mode and a battery mode, based on the stability of a line voltage coupled to the UPS;
wherein in the by-pass mode, the line voltage is directly coupled to the load when the line voltage is stable;
wherein in the line voltage conversion mode, the line voltage is further compared with a predetermined normal voltage, if the line voltage is higher than the normal voltage, a compensation voltage with a phase that is opposite to that of the line voltage is coupled to the line voltage in series;
wherein if the line voltage is lower than the normal voltage, a compensation voltage with a phase that is the same as that of the line voltage is coupled to the line voltage in series, wherein the compensation voltage is generated by the bi-directional AC/AC power converter;
wherein in the battery mode, a DC power supply unit of the line interactive UPS provides the load with power.
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Abstract
A power supply method and apparatus of a line interactive UPS utilizes a bi-directional AC/AC power converter in association with the AC delta control concept. When the line voltage coupled to the AC/AC power convert exceeds high/low statuses, the UPS is operated in a line voltage conversion mode, wherein the AC/AC power converter supplies a voltage to compensated the line voltage based on the stability of the line voltage, and then the compensated stable voltage is further provided to the load so as to perform the voltage boost (step-up) and/or voltage buck (step-down).
20 Citations
18 Claims
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1. A power supply method of a line interactive uninterruptible power supply (UPS) comprising the steps of:
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providing a first switching unit to be coupled between a line voltage and a bi-directional AC/AC converter, wherein the first switching unit has a first input terminal and a second input terminal respectively coupled to the line voltage; and two output terminals; providing a switching means to be couple to the first switching unit, the bi-directional AC/AC converter and a load, wherein the load has two ends; determining an operating mode of the line interactive UPS from a by-pass mode, a line voltage conversion mode and a battery mode, based on the stability of a line voltage coupled to the UPS; wherein in the by-pass mode, the line voltage is directly coupled to the load when the line voltage is stable; wherein in the line voltage conversion mode, the line voltage is further compared with a predetermined normal voltage, if the line voltage is higher than the normal voltage, a compensation voltage with a phase that is opposite to that of the line voltage is coupled to the line voltage in series;
wherein if the line voltage is lower than the normal voltage, a compensation voltage with a phase that is the same as that of the line voltage is coupled to the line voltage in series, wherein the compensation voltage is generated by the bi-directional AC/AC power converter;wherein in the battery mode, a DC power supply unit of the line interactive UPS provides the load with power. - View Dependent Claims (2)
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3. A line interactive uninterruptible power supply (UPS), the UPS comprising:
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a first switching unit with a first input terminal and a second input terminal respectively coupled to a line voltage, wherein the first switching unit has two output terminals; a bi-directional AC/AC power converter coupled between the two output terminals of the first switching unit and a switching means, wherein a load with two ends is coupled to the switching means; wherein when the line voltage is stable, the line voltage is directly provided to the load through the first switching unit and the switching means; wherein when the line voltage is unstable, the bi-directional AC/AC power converter outputs a compensation voltage to couple to the line voltage in series, and then the line voltage coupled to the compensation voltage is further supplied to the load; wherein when the line voltage is lower than a normal value, the UPS is operated in a voltage boost mode, and the compensation voltage has a phase that is the same as that of the line voltage;
otherwise when the line voltage is higher than the normal value, the UPS is operated in a voltage buck mode and the phase of the compensation voltage is opposite to that of the line voltage. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification