Patent ID: 9660513
Date: 2017-05-23
CPC Classifications: H02M

Claim:
1. A switching device comprising: a switching circuit including a switching element; a first driving voltage generator circuit that generates a first driving voltage on the basis of a first input voltage; a second driving voltage generator circuit that generates a second driving voltage on the basis of a second input voltage; a control circuit, driven by the first driving voltage, that generates a control signal; a drive circuit, driven by the second driving voltage, that turns the switching element on or off by supplying to the switching element a drive signal based on the control signal; a voltage generation controller that controls the second driving voltage generator circuit so that an operation of generating the second driving voltage by the second driving voltage generator circuit is allowed after activation of the control circuit; and a diode provided between a voltage input line and a line to which the output voltage of the second driving voltage generator circuit is imparted, wherein the first driving voltage generator circuit is formed to be capable of generating the first driving voltage by using the first input voltage or the second driving voltage output from the second driving voltage generator circuit; the first driving voltage generator circuit generates the first driving voltage on the basis of the voltage imparted to the voltage input line, and the voltage input line is imparted with the first input voltage or the output voltage of the second driving voltage generator circuit through the diode, depending on the first input voltage and the output voltage of the second driving voltage generator circuit.