Uninterruptible power supply device
View Patent ↗An uninterruptible power supply device is basically a device that performs a full-time inverter feeding system using a first semiconductor switch, and when a second semiconductor switch, which is an optional item, is connected in parallel to the first semiconductor switch and a full-time bypass feeding system is selected, serves as a device that performs the full-time bypass feeding system using the second semiconductor switch. This leads to a low device cost compared with the case in which an uninterruptible power supply device employing the full-time inverter feeding system and an uninterruptible power supply device employing the full-time feeding system are designed and manufactured separately.
1. An uninterruptible power supply device comprising:
a first input terminal configured to receive first AC power supplied from a first AC power supply;
a second input terminal configured to receive second AC power supplied from a second AC power supply;
a battery terminal to be connected to a power storage device;
an output terminal to be connected to a load;
a converter connected to the first input terminal and configured to convert the first AC power into DC power;
an inverter configured to convert the DC power generated by the converter or DC power of the power storage device into third AC power;
a first semiconductor switch connected between the second input terminal and the output terminal;
a first mechanical switch connected in parallel to the first semiconductor switch; and
a controller configured to control the uninterruptible power supply device in a feeding system selected from a first feeding system and a second feeding system,
the second feeding system being selectable only when a second semiconductor switch is connected in parallel to the first semiconductor switch,
the first feeding system being a feeding system in which
when the inverter is normal, the third AC power generated by the inverter is supplied to the load, and
when the inverter has failed, the second AC power supplied from the second AC power supply is supplied via the first semiconductor switch to the load for a predetermined time, and the second AC power is supplied via the first mechanical switch to the load,
the second feeding system being a feeding system in which
when the second AC power is supplied normally from the second AC power supply, the second AC power is supplied via the second semiconductor switch to the load, and
when a supply of the second AC power from the second AC power supply is stopped, the second semiconductor switch is turned off, and the third AC power generated by the inverter is supplied to the load.
2. The uninterruptible power supply device according to claim 1 , wherein a rated current value of the second semiconductor switch is greater than a rated current value of the first semiconductor switch.
3. The uninterruptible power supply device according to claim 1 , wherein the second semiconductor switch is prepared as an optional item for the uninterruptible power supply device.
4. The uninterruptible power supply device according to claim 1 , wherein the second semiconductor switch is detachable.
5. The uninterruptible power supply device according to claim 1 , wherein a space for installing the second semiconductor switch is prepared.
6. The uninterruptible power supply device according to claim 1 , further comprising a first switch terminal and a second switch terminal respectively connected to a first terminal and a second terminal of the first semiconductor switch,
wherein the second semiconductor switch is connected between the first and second switch terminals.
7. The uninterruptible power supply device according to claim 1 , further comprising the second semiconductor switch connected in parallel to the first semiconductor switch.
8. The uninterruptible power supply device according to claim 1 , wherein the second feeding system is a feeding system in which in a case where the second AC power is supplied normally from the second AC power supply,
when the second semiconductor switch has failed and does not turn on, the third AC power generated by the inverter is supplied to the load, and
when the inverter has failed further, the first mechanical switch is turned on, and the second AC power is supplied via the first mechanical switch to the load.
9. The uninterruptible power supply device according to claim 1 , further comprising a second mechanical switch connected between an output node of the inverter and the output terminal,
wherein in a case where the first feeding system is selected,
when the inverter is normal, the second mechanical switch is turned on, and
when the inverter has failed, the second mechanical switch is turned off, and
wherein in a case where the second feeding system is selected,
when the second AC power is supplied normally from the second AC power supply, the second mechanical switch is turned off, and
when a supply of the second AC power from the second AC power supply is stopped, the second mechanical switch is turned on.
10. The uninterruptible power supply device according to claim 1 , further comprising a bidirectional chopper configured to
supply the DC power generated by the converter to the power storage device when the first AC power is supplied normally from the first AC power supply, and
supply the DC power of the power storage device to the inverter when a supply of the first AC power from the first AC power supply is stopped.