摘要:
A system including a motor loss reducing controller system utilizing input band-shifting, an integral control architecture and inverse band-shifting is disclosed. The motor loss reducing controller system may provide correction of harmonic currents flowing to a PM motor from a motor controller. The compensation is added to the PWM voltage command signals. Within a compensator, d-axis and q-axis current feedback signals are frequency shifted down by n times the fundamental frequency. This converts the initial motor stationary harmonic currents into DC values. The frequency shifting is completed by multiplying the feedback signal by sine and cosine carrier signals of the shifted frequency. An integral controller may cancel any component of error at a desired DC value. An inverse frequency-shift transformation is applied to the output of the I controller in order to shift the command output signal back to the original reference frame.
摘要:
A universal AC to DC converter may be configured to convert alternating current (AC) to direct current (DC), such as for use in aerospace applications. The disclosure relates to a single universal power electronic converter capable of converting an AC input voltage, such as a line to neutral input voltage of either 115 Vrms or 230 Vrms nominal to 28 V DC.
摘要:
A multi-level converter includes a plurality of alternating current (AC) terminals connected to an AC source or load, at least three direct current (DC) terminals connected to a multi-level DC source or load, and a plurality of solid-state switches that are selectively turned On and Off to connect each of the plurality of AC terminals to one of the DC terminals. A controller provides PWM control signals to the solid-state switches. The controller utilizes space vector modulation to organize the various switching state configurations, and increments the switching states during a first half of the switching period and decrements the switching states during a second half of the switching period to center-align the PWM signals provided about the center of the switching period. The switching states utilized during the switching period dictate the PWM control signals provided to the plurality of switches employed in the three-level converter.
摘要:
A parallel semiconductor switching system includes an input filter circuit, a plurality of switching circuits, and a current-sharing filter inductor. The switching circuits receive the filtered voltage generated by the input filter circuit, and each switching circuit outputs a respective current. The current-sharing filter inductor includes a plurality of windings. Each winding has a winding input and a winding output. The winding input of each winding is connected to a switching output of a respective switching circuit, and the winding output of each winding is connected to one another to form a common node. The node common node is connected directly to a load such that the current-sharing filter inductor shares each current output from the plurality of switching circuits so as to deliver a combined current to the load.
摘要:
A multi-level power converter system includes a multi-level power converter configured to synthesize at least three direct current (DC) voltages into an alternating current (AC) output voltage, and includes a plurality of transistors. A controller generates pulse-width modulation (PWM) signals used to control a state of the plurality of transistors of the multi-level converter by comparing first and second carrier signals to a reference signals, wherein a period of the first and second carrier signals is randomly varied from a nominal period.
摘要:
A multi-cell battery pack may be designed to serve as a thermosiphon. Stated another way, multi-cell battery pack may be designed to incorporate a passive heat exchange technique based on natural convection, which circulates a substance (liquid, or gas such as air) without the necessity of a mechanical pump. In this way, insulating fluid in cavities between cells greatly enhances the likelihood of preventing a thermal runaway condition. The insulating fluid in cavities between cells may result in reduced arcing and the elimination of combustion within a battery housing.
摘要:
A multi-level converter includes a plurality of alternating current (AC) terminals connected to an AC source or load, at least three direct current (DC) terminals connected to a multi-level DC source or load, and a plurality of solid-state switches that are selectively turned On and Off to connect each of the plurality of AC terminals to one of the DC terminals. A controller provides PWM control signals to the solid-state switches. The controller utilizes space vector modulation to organize the various switching state configurations, and increments the switching states during a first half of the switching period and decrements the switching states during a second half of the switching period to center-align the PWM signals provided about the center of the switching period. The switching states utilized during the switching period dictate the PWM control signals provided to the plurality of switches employed in the three-level converter.