Short circuit determination apparatus, switch apparatus, and short circuit determination method
AssigneeFuji Electric Co., Ltd.
InventorsKunio MATSUBARA, Ryoga KIGUCHI
Life of this patent
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Abstract
There is provided a short circuit determination apparatus including: a sensor configured to detect, in a switching device that has a control terminal, a first main terminal, and a second main terminal, a temporal change of a main current flowing between the first main terminal and the second main terminal; and a short circuit determination unit configured to determine that the switching device is short-circuited, in a case where the temporal change of the main current is larger than or equal to a first threshold value, after a first timing after a control signal for driving the control terminal is turned on.
Claims20
A short circuit determination apparatus comprising:
- a sensor configured to detect, in a switching device that has a control terminal, a first main terminal, and a second main terminal, a temporal change of a main current flowing between the first main terminal and the second main terminal;
- and
- a short circuit determination unit that has a first determination unit configured to determine that the switching device is short-circuited, in a case where the temporal change of the main current is larger than or equal to a first threshold value, only after a first timing after a control signal for driving the control terminal is turned on, wherein
- the short circuit determination unit has a timing detection unit configured to compare the temporal change of the main current with a second threshold value, and detect the first timing when the temporal change of the main current is smaller than or equal to the second threshold value.
A short circuit determination method for determining a short circuit of a switching device that has a control terminal, a first main terminal, and a second main terminal, the method comprising:
- detecting a temporal change of a main current flowing between the first main terminal and the second main terminal;
- comparing the temporal change of the main current with a second threshold value, and detecting a first timing when the temporal change of the main current is smaller than or equal to the second threshold value;
- and
- determining that the switching device is short-circuited, in a case where the temporal change of the main current is larger than or equal to a first threshold value, only after the first timing after a control signal for driving the control terminal is turned on.
Dependencies are inferred from the claim text.