Abstract: A power converter can be controlled to generate a target output power. The control process may include obtaining a target current reference for the power converter, sensing an output current of the power converter, and determining a difference between the target current reference and the sensed output current. The next switching duty cycle for the next switching period of the switching circuits in the power converter can be derived based on at least the present switching duty cycle of the present switching period, and the difference between the target current reference and the sensed output current. The switching circuits of the power converter can then be switched according to the derived next switching duty cycle in the next switching period.

Abstract: A power converter can be controlled to generate a target output power based on a reactive power reference and an active power reference. The control process may include monitoring a time-varying power signal (e.g., a power grid voltage signal from a power grid), and filtering the time-varying power signal to derive a filtered sine component of the time-varying power signal and a filtered cosine component of the time-varying power signal. A sine coefficient and cosine coefficient each based on at least the reactive power reference and the active power reference can be determined, and applied to the filtered sine component and filtered cosine component of the time-varying power signal, respectively. A target current reference of the power converter can then be set to include a sum of the current reference sine component and the current reference cosine component.

Abstract: A bidirectional power converter that can be used in an electric vehicle to perform AC to DC power conversion to charge the electric vehicle's battery and to perform DC to AC power conversion to export power to run external electrical loads is described. The bidirectional power converter may include an AC interface coupled to a cyclo-inverter circuit, and a DC interface coupled to a H-bridge circuit. The cyclo-inverter can be electrically coupled to the H-bridge circuit through a transformer. The bidirectional power converter may include a neutral terminal on the AC interface that is coupled to the transformer through a filtering inductor.

Abstract: A power converter can be controlled to generate a target output power. The control process may include obtaining a target current reference for the power converter, sensing an output current of the power converter, and determining a difference between the target current reference and the sensed output current. The next switching duty cycle for the next switching period of the switching circuits in the power converter can be derived based on at least the present switching duty cycle of the present switching period, and the difference between the target current reference and the sensed output current. The switching circuits of the power converter can then be switched according to the derived next switching duty cycle in the next switching period.

Abstract: A power converter can be controlled to generate a target output power based on a reactive power reference and an active power reference. The control process may include monitoring a time-varying power signal (e.g., a power grid voltage signal from a power grid), and filtering the time-varying power signal to derive a filtered sine component of the time-varying power signal and a filtered cosine component of the time-varying power signal. A sine coefficient and cosine coefficient each based on at least the reactive power reference and the active power reference can be determined, and applied to the filtered sine component and filtered cosine component of the time-varying power signal, respectively. A target current reference of the power converter can then be set to include a sum of the current reference sine component and the current reference cosine component.

Abstract: A bidirectional power converter that can be used in an electric vehicle to perform AC to DC power conversion to charge the electric vehicle's battery and to perform DC to AC power conversion to export power to run external electrical loads is described. The bidirectional power converter may include an AC interface coupled to a cyclo-inverter circuit, and a DC interface coupled to a H-bridge circuit. The cyclo-inverter can be electrically coupled to the H-bridge circuit through a transformer. The bidirectional power converter may include a neutral terminal on the AC interface that is coupled to the transformer through a filtering inductor.

Abstract: A state machine implemented controller is provided in which a logic core 20 is reconfigurable in response to state data held within a memory 22. Thus, on transition from one state to a next state the data held within the memory 22 is used to reconfigure the operation of the logic core 20. This enables a relatively compact logic core 20 to be used time and time again, thereby avoiding the need to individually define a logic core appropriate to each individual one of the states that the state machine can enter into. This results in a controller which is much more compact on an integrated circuit die than is the case with prior art controllers.

Abstract: A method for automatically providing a printing plate to a plate cylinder includes the steps of aligning a first edge of a printing plate against a cylinder adjacent to a plate cylinder, moving the first edge of the printing plate into a gap in the plate cylinder, and wrapping the printing plate about the plate cylinder. The present invention also includes a device for attaching a printing plate to a plate cylinder comprising a first set of grippers for gripping a printing plate and aligning the printing plate against a cylinder adjacent to the plate cylinder, and a second set of grippers for moving the printing plate toward a gap in the plate cylinder. An offset printing press having the device is also disclosed.

Abstract: A method for automatically providing a printing plate to a plate cylinder includes the steps of aligning a first edge of a printing plate against a cylinder adjacent to a plate cylinder, moving the first edge of the printing plate into a gap in the plate cylinder, and wrapping the printing plate about the plate cylinder. The present invention also includes a device for attaching a printing plate to a plate cylinder comprising a first set of grippers for gripping a printing plate and aligning the printing plate against a cylinder adjacent to the plate cylinder, and a second set of grippers for moving the printing plate toward a gap in the plate cylinder. An offset printing press having the device is also disclosed.

Abstract: Printing plates can be reliably extracted from a plate cylinder with an automatic plate changer even when the plate lock has a very narrow plate gap between the trailing edge and the leading edge of the printing plate. First, the trailing edge of a printing plate is released by the locking member and the printing plate is elastically deformed at the trailing edge. This allows the guide fork of the automatic plate changer to reliably peel the printing plate away from the plate cylinder. In addition, the guide fork may engage the leading edge of the printing plate after the plate lock has been disengaged once more and peel the leading edge away from the plate cylinder by pivoting away from the cylinder.