Power converter and control method thereof
AssigneeFuji Electric Co., Ltd.
InventorHiromu TAKUBO
Life of this patent
Estimating the term…
Abstract
Aspects of the invention can provide a control method of a power converter that is capable of preventing increase of electromagnetic noise that are caused by simultaneous change of the states of power semiconductor switching elements of the power converter. State changes of ON/OFF pulses that are input to power semiconductor switching elements are detected, and, when the timings of the state changes of any two of the ON/OFF pulses match each other, the state change of either one of the ON/OFF pulses, of which state changes match each other, is delayed.
Claims12
A control method of a power converter having a plurality of power semiconductor switching elements, the control method comprising the steps of:
- detecting state changes of ON/OFF pulses that are input to the power semiconductor switching elements respectively;
- and
- when timings of the state changes of any of the ON/OFF pulses match each other, delaying the state change of any one of the ON/OFF pulses of which state changes match each other.
A power converter, comprising:
- a power conversion circuit in which a plurality of power semiconductor switching elements are bridge-connected;
- a drive circuit that drives the power semiconductor switching elements;
- a voltage command circuit that outputs voltage command values of respective phases, which control an output voltage of the power conversion circuit;
- a carrier wave generating circuit that outputs a carrier wave for generating ON/OFF pulses for turning the power semiconductor switching elements ON/OFF;
- and
- a pulse distribution circuit that outputs ON/OFF pulses for turning the power semiconductor switching elements ON/OFF based on a comparison signal obtained by comparing the voltage command values with the carrier wave,
- the power converter further comprising a timing adjustment circuit that receives input of the voltage command values of the respective phases that are output by the voltage command circuit, the carrier wave, and the ON/OFF pulses that are output from the pulse distribution circuit and used for turning the power semiconductor switching elements ON/OFF, determines that state changes of the ON/OFF pulses match each other when the voltage command values of two different phases, out of the voltage command values of the plurality of phases output from the voltage command circuit, match each other and when levels of the voltage command values match a level of the carrier wave as a result of comparing the voltage command values with the carrier wave, delays a state change of either one of the ON/OFF pulses of which state changes match each other, and outputs, to the drive circuit, the resultant ON/OFF pulse as an ON/OFF signal having an adjusted pulse edge.
A power converter, comprising:
- a power conversion circuit in which a plurality of power semiconductor switching elements are bridge-connected;
- a drive circuit that drives the power semiconductor switching elements;
- a voltage command circuit that outputs voltage command values of respective phases, which control an output voltage of the power conversion circuit;
- a carrier wave generating circuit that outputs a carrier wave for generating ON/OFF pulses for turning the power semiconductor switching elements ON/OFF;
- and
- a pulse distribution circuit that outputs ON/OFF pulses for turning the power semiconductor switching elements ON/OFF based on a comparison signal obtained by comparing the voltage command values with the carrier wave,
- the power converter further comprising a plurality of state change detectors that receive input of the ON/OFF pulses for the respective power semiconductor switching elements from the pulse distribution circuit and detect state changes of the ON/OFF pulses individually;
- and
- a state change delay part that delays any of the detected state changes of the ON/OFF pulses when the ON/OFF pulses, of which state changes match each other, are detected by the state change detectors.
Dependencies are inferred from the claim text.