TNPC inverter device and method for detecting short-circuit thereof
First Claim
1. A TNPC inverter device, comprising:
- a TNPC inverter module comprising;
a first DC terminal;
a second DC terminal;
an AC terminal;
a capacitor bridge arm;
an inverting bridge arm comprised an upper switch unit and a lower switch unit which are connected in series; and
a bi-directional switching bridge arm; and
a short circuit detecting module, mainly consisting of an upper switch detecting unit and a lower switch detecting unit;
wherein ends of the capacitor bridge arm and ends of the inverting bridge arm are correspondingly connected to the first DC terminal and the second DC terminal, ends of the bi-directional switching bridge arm are correspondingly connected to a midpoint of the capacitor bridge arm and a midpoint of the inverting bridge arm, the AC terminal is the midpoint of the inverting bridge arm; and
wherein the upper switch detecting unit is configured to detect a voltage drop of the upper switch unit, and the lower switch detecting unit is configured to detect a voltage drop of the lower switch unit,wherein the TNPC inverter module futher comprises a midpoint terminal, and the midpoint of the capacitor bridge arm is eletrically connected with the midpoint terminal,wherein the bi-directional switching bridge arm comprises;
a first flow direction switch unit; and
a second flow direction switch unit,when the first flow direction switch unit turns on, current in the bi-directional switching bridge arm flows to the midpoint terminal from the AC terminal, and when the second flow direction switch unit turns on, current in the bio-directional switching bridge arm flows to the AC terminal from the midpoint terminal, andwherein when a short-circuit path comprised both the bi-directional switching bridge arm and the upper switch unit or the lower switch unit, the voltage drop of the upper switch unit of the voltage drop of the lower switch unit in the short-circuit path is not less than voltage drops of the corresponding first flow direction switch unit or second flow direction switch unit.
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Accused Products
Abstract
The present application discloses a TNPC inverter device, comprising: a TNPC inverter module and a short circuit detecting module. The TNPC module at least comprises an inverting bridge arm and a bi-directional switching bridge arm. The inverting bridge arm comprises at least two switches connected in series; the bi-directional switching bridge arm comprises at least two switches. The short circuit detecting module mainly consists of two switch detecting unit corresponding to the two switches in the inverting bridge arm respectively. Increasing the voltage drop of the switches in the inverting bridge when a short circuit occurs in the TNPC module by some way, then it could realize the short circuit detecting module is able to detect all the paths of the short circuit in the TNPC module to simplify the peripheral circuit of the TNPC module in the TNPC inverter device.
13 Citations
14 Claims
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1. A TNPC inverter device, comprising:
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a TNPC inverter module comprising; a first DC terminal; a second DC terminal; an AC terminal; a capacitor bridge arm; an inverting bridge arm comprised an upper switch unit and a lower switch unit which are connected in series; and a bi-directional switching bridge arm; and a short circuit detecting module, mainly consisting of an upper switch detecting unit and a lower switch detecting unit; wherein ends of the capacitor bridge arm and ends of the inverting bridge arm are correspondingly connected to the first DC terminal and the second DC terminal, ends of the bi-directional switching bridge arm are correspondingly connected to a midpoint of the capacitor bridge arm and a midpoint of the inverting bridge arm, the AC terminal is the midpoint of the inverting bridge arm; and wherein the upper switch detecting unit is configured to detect a voltage drop of the upper switch unit, and the lower switch detecting unit is configured to detect a voltage drop of the lower switch unit, wherein the TNPC inverter module futher comprises a midpoint terminal, and the midpoint of the capacitor bridge arm is eletrically connected with the midpoint terminal, wherein the bi-directional switching bridge arm comprises; a first flow direction switch unit; and a second flow direction switch unit, when the first flow direction switch unit turns on, current in the bi-directional switching bridge arm flows to the midpoint terminal from the AC terminal, and when the second flow direction switch unit turns on, current in the bio-directional switching bridge arm flows to the AC terminal from the midpoint terminal, and wherein when a short-circuit path comprised both the bi-directional switching bridge arm and the upper switch unit or the lower switch unit, the voltage drop of the upper switch unit of the voltage drop of the lower switch unit in the short-circuit path is not less than voltage drops of the corresponding first flow direction switch unit or second flow direction switch unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting a short-circuit in a TNPC inverter device, wherein the TNPC inverter device comprises:
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a TNPC inverter module comprising; a first DC terminal; a second DC terminal; an AC terminal; a capacitor bridge arm; an inverting bridge arm comprising an upper switch unit and a lower switch unit which are connected in series; and a bi-directional switching bridge arm; and a short circuit detecting module mainly consisting of an upper switch detecting unit and a lower switch detecting unit, wherein ends of the capacitor bridge arm and ends of the inverting bridge arm are correspondingly connected to the first DC terminal and the second DC terminal, ends of the bi-directional switching bridge arm are correspondingly connected to a midpoint of the capacitor bridge arm and a midpoint of the inverting bridge arm, the AC terminal is the midpoint of the inverting bridge arm; and wherein the upper switch detecting unit is configured to detect a voltage drop of the upper switch unit, and the lower switch detecting unit is configured to detect a voltage drop of the lower switch unit, wherein the TNPC inverter module further comprises a midpoint terminal, and the midpoint of the capacitor bridge arm is electrically connected with the midpoint terminal, wherein the bi-directional switching bridge arm comprises; a first flaw direction switch unit, and a second flow direction switch unit, when the first flow direction switch unit turns on, current in the bi-directional switching bridge arm flows to the midpoint terminal from the AC terminal, and when the second flow direction switch unit turns on, current in the bi-directional switching bridge arm flows to the AC terminal from the midpoint terminal, and wherein when a short-circuit path comprised both the bi-directional switching bridge arm and the upper switch unit or the lower switch unit, the voltage drop of the upper switch unit or the voltage drop of the lower switch unit in the short-circuit path is not less than voltage drops of the corresponding first flow direction switch unit or second flow direction switch unit, and the method comprising; merely detecting voltage drops of the upper switch unit and the lower switch unit in the TNPC inverter module of the TNPC inverter device; and making a judgment about the occurrence of a short-circuit in the TNPC inverter module based on the comparison result of the voltage drop of the upper switch unit or the lower switch unit and a reference value amendments to the figures and claims and the following remarks.
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Specification