Drive device for power converter and driving method of power converter
AssigneeMitsubishi Corporation
InventorsYosuke Shinomoto, Michio Yamada, Kazunori Hatakeyama, Takuya Shimomugi
Life of this patent
Estimating the term…
Abstract
A drive device driving a power converter that includes a switching element formed from a wide bandgap semiconductor, includes a PWM-signal output unit that generates a drive signal that drives the switching element with PWM; an on-speed reducing unit that, when the switching element is changed from off to on, reduces a change rate of the drive signal; and an off-speed improving unit that, when the switching element is changed from on to off, draws charge from the switching element at a high speed and with a charge drawing performance higher than that at a time when the switching element is changed from off to on.
Claims15
A drive device for a power converter, the drive device driving the power converter that includes a switching element formed from a wide bandgap semiconductor, the device comprising:
- a PWM-signal output unit that generates a first drive signal for driving the switching element with PWM;
- an on-speed reducing unit that outputs a second drive signal to the switching element in response to the first drive signal and that includes a resistor, a capacitor, a waveform generating unit, a comparator, and an AND circuit;
- and
- an off-speed improving unit that, when the switching element is changed from on to off, draws charge from the switching element with a charge drawing performance higher than when the switching element is changed from off to on, wherein
- a leading edge of the second drive signal, for turning on the switch element, includes a first change rate, a second change rate, and a third change rate, and
- the second change rate, between the first and third change rate, is larger than the first and third change rates.
A driving method of a power converter for driving the power converter that includes a switching element formed from a wide bandgap semiconductor, the method comprising:
- a PWM-signal outputting step of generating a drive signal that drives the switching element with PWM;
- an on-speed reducing step of outputting a second drive signal from an on-speed reducing unit includes a resistor, a capacitor, a waveform generating unit, a comparator, and an AND circuit to the switching element in response to the first drive signal;
- and
- an off-speed improving step of, when the switching element is changed from on to off, drawing charge from the switching element with a charge drawing performance higher than when the switching element is changed from off to on, wherein
- a leading edge of the second drive signal, for turning on the switch element, includes a first change rate, a second change rate, and a third change rate, and
- the second change rate, between the first and third change rate, is larger than the first and third change rates.
Dependencies are inferred from the claim text.