PROTECTION CONTROL SYSTEM FOR A MULTILEVEL POWER CONVERSION CIRCUIT
First Claim
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1. A protection control system for a multilevel power conversion circuit of a flying capacitor type for converting a DC power into an AC power or converting an AC power into a DC power, one phase portion of the power conversion circuit comprising:
- six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply circuit, each semiconductor switch having an antiparallel-connected diode;
a gate driving circuit with an arm short-circuit protection circuit connected to a gate terminal of each semiconductor switch;
a first capacitor connected between a connection point of the second and third semiconductor switches and a connection point of the fourth and fifth semiconductor switch;
a second capacitor connected between a connection point of the first and second semiconductor switches and a connection point of the fifth and sixth semiconductor switches; and
an AC terminal at a connection point of the third and fourth semiconductor switches;
wherein the protection control system turns ON the second semiconductor switch or maintains the second semiconductor switch in an ON state, in a case of short-circuit fault of the third semiconductor switch.
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Abstract
Aspects of the invention are directed to a protection control system of the invention is a protection control system for a multilevel power conversion circuit of a flying capacitor type, the power conversion circuit including six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply, a first capacitor connected between the connection point of the second and third semiconductor switches and the connection point of the fourth and fifth semiconductor switches and a second capacitor connected between the connection point of the first and second semiconductor switches and the connection point of the fifth and sixth semiconductor switches, wherein the protection control system of the invention turns ON the second semiconductor switch or maintains the second semiconductor switch in an ON state, in the case of short-circuit fault of the third semiconductor switch.
24 Citations
8 Claims
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1. A protection control system for a multilevel power conversion circuit of a flying capacitor type for converting a DC power into an AC power or converting an AC power into a DC power, one phase portion of the power conversion circuit comprising:
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six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply circuit, each semiconductor switch having an antiparallel-connected diode; a gate driving circuit with an arm short-circuit protection circuit connected to a gate terminal of each semiconductor switch; a first capacitor connected between a connection point of the second and third semiconductor switches and a connection point of the fourth and fifth semiconductor switch; a second capacitor connected between a connection point of the first and second semiconductor switches and a connection point of the fifth and sixth semiconductor switches; and an AC terminal at a connection point of the third and fourth semiconductor switches; wherein the protection control system turns ON the second semiconductor switch or maintains the second semiconductor switch in an ON state, in a case of short-circuit fault of the third semiconductor switch. - View Dependent Claims (3, 4, 5)
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2. A protection control system for a multilevel power conversion circuit of a flying capacitor type for converting a DC power into an AC power or converting an AC power into a DC power, one phase portion of the power conversion circuit comprising:
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six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply circuit, each semiconductor switch having an antiparallel-connected diode; a gate driving circuit with an arm short-circuit protection circuit connected to a gate terminal of each semiconductor switch; a first capacitor connected between a connection point of the second and third semiconductor switches and a connection point of the fourth and fifth semiconductor switch; a second capacitor connected between a connection point of the first and second semiconductor switches and a connection point of the fifth and sixth semiconductor switches; and an AC terminal at a connection point of the third and fourth semiconductor switches; wherein the protection control system turns ON the fifth semiconductor switch or maintains the fifth semiconductor switch in an ON state, in a case of short-circuit fault of the fourth semiconductor switch.
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6. A protection control system for a five-level or more levels of power conversion circuit of a flying capacitor type for converting a DC power into an AC power or converting an AC power into a DC power, one phase portion of the power conversion circuit comprising:
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2 N pieces of semiconductor switches, N being an integer of four or larger, sequentially connected in series from a positive terminal to a negative terminal of a DC power supply circuit, each semiconductor switch having an antiparallel-connected diode; a gate driving circuit with an arm short-circuit protection circuit connected to a gate terminal of each semiconductor switch; and (N−
1) pieces of capacitors connected between a connection point of the (N−
I+1)-th and (N−
I)-th semiconductor switches and a connection point of the (N+I)-th and (N+I+1)-th semiconductor switches, I being an integer from 1 to (N−
1);wherein when a J-th semiconductor switch, J being an integer from 3 to (2N−
2), becomes in a short-circuit fault state, short-circuit current is interrupted by a normally operating semiconductor switch in which the short-circuit current running through the semiconductor switch in the short-circuit fault state flows, and the protection control system turns ON, or maintains in an ON state, the (J−
1)-th semiconductor switch if J≦
N or the (J+1)-th semiconductor switch if J≧
(N+1), which is then turned OFF when the voltage across the (J+1)-th capacitor decreases to a predetermined voltage value.- View Dependent Claims (7, 8)
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Specification
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Current AssigneeFuji Electric Company Limited (Fuji Electric Systems Company Limited)
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Original AssigneeFuji Electric Company Limited (Fuji Electric Systems Company Limited)
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InventorsTAKIZAWA, Satoki
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current363/53
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CPC Class CodesH02H 7/1203 Circuits independent of the...H02M 1/0095 Hybrid converter topologies...H02M 1/32 Means for protecting conver...H02M 7/483 Converters with outputs tha...H02M 7/4837 Flying capacitor convertersH02M 7/487 Neutral point clamped inver...
