摘要:
Verfahren zum Erzeugen einer Ausgangsspannung (US) mit einem einstellbaren Effektivwert aus einer veränderlichen Zwischenkreisspannung (UZK), wobei der Effektivwert der Ausgangsspannung mittels einer Pulsweitenmodulation der Zwischenkreisspannung eingestellt wird, mit den Schritten: Messen der Zwischenkreisspannung, Erzeugen eines Zählertaktsignals mit einer Zählertaktfrequenz (fc), die proportional zu der gemessenen Zwischenkreisspannung ist, Erzeugen von mindestens einem Zählersollwert (ZS), der von einem eingestellten Effektivwert der Ausgangsspannung abhängig ist, Erzeugen von Zählerwerten im Takt des Zählertaktsignals und Erzeugen der Ausgangsspannung als pulsweitenmoduliertes Signal, indem der Zählerwert mit dem mindestens einen Zählersollwert verglichen wird und ein Pegel der Ausgangsspannung in Abhängigkeit vom Ergebnis des Vergleichens eingestellt wird.
摘要:
An area of a narrow interval between neighboring insulating gates and an area of a wide interval are provided and in the area of a wide interval, a p-type well layer deeper than a p-type base layer is provided. By use of this constitution, even if an area of a narrow interval between neighboring insulating gates and an area of a wide interval are provided, the withstand voltage will not be lowered.
摘要:
The present invention provides electrical devices that derive power from an incoming power source to produce output power to drive the device. The device includes circuitry or other means for determining at least one characteristic of the incoming power source, and for adjusting the output power used to drive the device based on the characteristic or characteristics of the incoming power source. The present invention thereby is able to operate at a reduced or lower output power in instance where the characteristics of the power source, e.g., the voltage and/or frequency, warrant.
摘要:
An area of a narrow interval between neighboring insulating gates and an area of a wide interval are provided and in the area of a wide interval, a p-type well layer deeper than a p-type base layer is provided. By use of this constitution, even if an area of a narrow interval between neighboring insulating gates and an area of a wide interval are provided, the withstand voltage will not be lowered.
摘要:
In a multi series pulse width modulation inverter arrangement, an inverter arrangement which can continue the inverter operation, in particular, by preventing an overcurrent caused by an erroneous firing of a switching element therein is provided. The multi series inverter arrangement is constituted to be operative in three level mode and in two level mode. Even when an erroneous firing thereof due to noise is generated, the operation of the inverter unit (4) can be continued, the overcurrent due to the erroneous firing is eliminated, the present inverter arrangement can be used under a severe noise environment and outputs an AC output having a small amount of higher harmonics, moreover when the inverter arrangement is operating under a three level mode in a low efficiency region, the operating mode of the inverter arrangement is positively switched from the three level mode to the two level mode, thereby the operating efficiency of the inverter arrangement is enhanced.
摘要:
In an apparatus for controlling a power converter, which is adapted to control, in accordance with the PWM system, a voltage-type inverter for system interconnection interposed between the d.c. power source and the a.c. system to interchange power therebetween, a scheme is employed to switch voltage amplitude adjustment signals of respective phases for determining the amplitudes of respective phase output voltages of the inverter depending upon an output voltage phase signal for determining the phase of the output a.c. voltage to thereby provide a phase voltage amplitude, to therefore determine energization periods of respective controllable rectifier elements of the power converter on the basis of the phase voltage amplitude and the output voltage phase signal. Employment of such a scheme makes it possible to independently control the output voltage of the inverter every phase or with respect to both positive and negative sides of the phases, respectively.