Uninterruptible power supply apparatus
First Claim
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1. An uninterruptible power supply apparatus, comprising:
- a load;
an AC input receiving an AC input voltage; and
a single-phase AC/AC converter connected to the AC input and including an AC inductor, a bus capacitor having a bus voltage, a boost arm having a first switch and a second switch, a common arm having a third switch and a fourth switch and a buck arm having a fifth switch and a sixth switch, wherein the buck arm is connected to the bus capacitor, the boost arm and the common arm in parallel,wherein a bus voltage parameter K is set in a range of 0≦
K≦
1, so that the bus voltage approaches to a DC voltage when K approaches to 1 while the load is light-load, the bus voltage approaches to a full-wave rectifying voltage when K approaches to 0 while the load is heavy-load, the first switch and the second switch of the boost arm, the third switch and the fourth switch of the common arm and the fifth switch and the sixth switch of the buck arm are controlled so that the bus voltage has a waveform including a DC segment when |sin(wt)|≦
K and a full-wave rectifying segment when |sin(wt)|>
K, where w is an angular velocity and t is a passing time, to implement a regulation of the AC input voltage, and an average voltage value of the bus during the full-wave rectifying segment is larger than that during the DC segment.
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Abstract
A method of controlling an uninterruptible power supply apparatus (UPS) is provided. The UPS apparatus includes at least an AC input voltage, a DC input voltage and a single-phase AC/AC converter. The single-phase AC/AC converter includes an AC inductor, a bus capacitor, a boost arm, a common arm and a buck arm. The method includes steps of: controlling the bus voltage to have a DC component and full-wave rectifying component, and setting a bus voltage parameter K so that the bus voltage approaches to a full-wave rectifying voltage when K approaches to 1, wherein 0≦K≦1.
16 Citations
12 Claims
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1. An uninterruptible power supply apparatus, comprising:
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a load; an AC input receiving an AC input voltage; and a single-phase AC/AC converter connected to the AC input and including an AC inductor, a bus capacitor having a bus voltage, a boost arm having a first switch and a second switch, a common arm having a third switch and a fourth switch and a buck arm having a fifth switch and a sixth switch, wherein the buck arm is connected to the bus capacitor, the boost arm and the common arm in parallel, wherein a bus voltage parameter K is set in a range of 0≦
K≦
1, so that the bus voltage approaches to a DC voltage when K approaches to 1 while the load is light-load, the bus voltage approaches to a full-wave rectifying voltage when K approaches to 0 while the load is heavy-load, the first switch and the second switch of the boost arm, the third switch and the fourth switch of the common arm and the fifth switch and the sixth switch of the buck arm are controlled so that the bus voltage has a waveform including a DC segment when |sin(wt)|≦
K and a full-wave rectifying segment when |sin(wt)|>
K, where w is an angular velocity and t is a passing time, to implement a regulation of the AC input voltage, and an average voltage value of the bus during the full-wave rectifying segment is larger than that during the DC segment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An uninterruptible power supply apparatus, comprising:
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a load; an AC input receiving an AC voltage; and a single-phase AC/AC converter connected to the AC input and including an AC inductor, a bus capacitor having a bus voltage, a boost arm having a first switch and a second switch, a common arm having a third switch and a fourth switch and a buck arm having a fifth switch and a sixth switch and connected to the bus capacitor, the boost arm and the common arm in parallel, wherein the bus voltage is controlled to have a waveform including a low slope segment when |sin(wt)|≦
K and a full-wave rectifying segment when |sin(wt)|>
K, where K is a bus voltage parameter K representing an amount of an output power, is set in a range of 0≦
K≦
1, is increased to approach 1 when the load is light-load and is decreased to approach 0 when the load is heavy-load, w is an angular velocity and t is a passing time, the first switch and the second switch of the boost arm, the third switch and the fourth switch of the common arm and the fifth switch and the sixth switch of the buck arm are controlled to regulate a proportion of the low slope segment and the full-wave rectifying segment within a full cycle to implement a regulation of the AC input voltage, an average voltage value of the bus during the full-wave rectifying segment is larger than that during the low slope segment and the waveform of the bus voltage during the low slope segment has a slope lower than that of the waveform of the bus voltage during the full-wave rectifying segment. - View Dependent Claims (9, 10, 11, 12)
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Specification