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US 10,756,567 B2Granted
Uninterruptible power supply device
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorsHiroshi Masunaga, Akihiro Yamanishi
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Abstract
When an abnormality occurs in a first voltage detector (4a), a control circuit (7) in an uninterruptible power supply device controls an inverter (3) in synchronization with an output signal (VI2D) from a second voltage detector (4b) to match a phase of a two-phase AC voltage (VO1, VO2) output from the inverter (3) with a phase of a two-phase AC voltage (VI1, VI2) supplied from a commercial AC power supply (51), and then turns on a semiconductor switch pair (S9, S10) and a bypass switch pair (S7, S8). Accordingly, even when an abnormality occurs in the first voltage detector (4a), the two-phase AC voltage can be supplied to a load (53) without instantaneous interruption.
Claims7
An uninterruptible power supply device of a two-phase three-wire type, the uninterruptible power supply device comprising:
- a converter configured to convert a two-phase AC voltage supplied from a commercial AC power supply into a DC voltage;
- an inverter configured to convert the DC voltage generated by the converter or a DC voltage supplied from a power storage device into a two-phase AC voltage, and supply the two-phase AC voltage to a load;
- a bypass switch pair having one terminal pair receiving the two-phase AC voltage from the commercial AC power supply and the other terminal pair connected to the load;
- a semiconductor switch pair connected in parallel to the bypass switch pair;
- a first voltage detector and a second voltage detector each configured to detect an instantaneous value of the two-phase AC voltage from the commercial AC power supply, and generate an output signal indicating a detected value;
- an abnormality detector configured to determine whether the first voltage detector normally functions or not, and generate an output signal indicating a determination result;
- and
- a control circuit configured to control the uninterruptible power supply device based on the output signals from the first voltage detector and the second voltage detector and the output signal from the abnormality detector,
- i) when the first voltage detector normally functions, the control circuit being configured to:
- turn off the bypass switch pair and the semiconductor switch pair;
- and
- control the converter and the inverter in synchronization with the output signal from the first voltage detector,
- ii) when an abnormality occurs in the first voltage detector, the control circuit being configured to:
- stop an operation of the converter;
- control the inverter in synchronization with the output signal from the second voltage detector to convert the DC voltage from the power storage device into a two-phase AC voltage, and to match a phase of the two-phase AC voltage with a phase of the two-phase AC voltage from the commercial AC power supply;
- turn on the bypass switch pair and the semiconductor switch pair when a voltage across terminals of the power storage device decreases and reaches a predetermined voltage;
- and
- turn off the semiconductor switch pair after a lapse of a predetermined time period.
15 more elements
An uninterruptible power supply device of a two-phase three-wire type, the uninterruptible power supply device comprising:
- a converter configured to convert a two-phase AC voltage supplied from a commercial AC power supply into a DC voltage;
- an inverter configured to convert the DC voltage generated by the converter or a DC voltage supplied from a power storage device into a two-phase AC voltage, and supply the two-phase AC voltage to a load;
- a bypass switch pair having one terminal pair receiving the two-phase AC voltage from the commercial AC power supply and the other terminal pair connected to the load;
- a semiconductor switch pair connected in parallel to the bypass switch pair;
- a first voltage detector and a second voltage detector each configured to detect an instantaneous value of an AC voltage in one phase of the two-phase AC voltage from the commercial AC power supply, and generate an output signal indicating a detected value;
- a third voltage detector configured to detect an instantaneous value of an AC voltage in the other phase of the two-phase AC voltage from the commercial AC power supply, and generate an output signal indicating a detected value;
- and
- an abnormality detector configured to determine whether the first voltage detector normally functions or not, and generate an output signal indicating a determination result;
- and
- a control circuit configured to control the uninterruptible power supply device based on the output signals from the first voltage detector, the second voltage detector and the third voltage detector and the output signal from the abnormality detector,
- i) when the first voltage detector normally functions, the control circuit being configured to:
- turn off the bypass switch pair and the semiconductor switch pair;
- and
- control the converter and the inverter in synchronization with the output signal from the first voltage detector,
- ii) when an abnormality occurs in the first voltage detector, the control circuit being configured to:
- stop an operation of the converter;
- control the inverter in synchronization with the output signal from the second voltage detector to convert the DC voltage from the power storage device into a two-phase AC voltage, and to match a phase of the two-phase AC voltage with a phase of the two-phase AC voltage from the commercial AC power supply,
- turn on the bypass switch pair and the semiconductor switch pair when a voltage across terminals of the power storage device decreases and reaches a predetermined voltage;
- and
- turn off the semiconductor switch pair after a lapse of a predetermined time period.
17 more elements
Dependencies are inferred from the claim text.