| 摘要 |
In a switching circuit having multiple parallel circuits having at least one switching element having a characteristic of firing by themselves due to over-voltage, this invention is to provide a switching circuit protection apparatus which prevents the flowing of a current concentrated in the first of the parallel circuits to fire due to over-voltage. The apparatus in this invention comprises a switching circuit composed by connecting in parallel multiple circuits having at least one switching element having a characteristic of self-firing due to over-voltage, detecting means for detecting the self-firing of the switching element in the switching circuit, and firing means for applying an firing pulse to all the switching elements in response to an output signal applied from the detecting means and firing all the switching elements at the same time by the firing pulse.
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