184 results about "Active rectification" patented technology

A power system having a phase locked loop (PLL) with a notch filter for synchronous reference frame sequence separation. The notch filter includes a generalized integrator tuned to the notch frequency. The output of the generalized integrator is summed with the filter input signal and the output of the summer is fed back to the integrator input. In one embodiment, the notch filter is programmable by a control signal generated in response to the filter output signal, thereby causing the filter to self-regulate to a frequency related to the PLL input signal. Illustrative power systems include active VAR generators and active rectifiers. One or more additional notch filters may be used to remove harmonic components from derived synchronous reference frame sequence components.

The utility model relates to a voltage type source rectifier stable control system and method based on LCL filter wave, belonging to the source rectifying technical range of electronic technology. The system comprises a DC voltage control cell, a current control cell, an active damp control cell and a voltage space vector generating cell. the utility model produces six PWM signals to gain the current signal of the filter wave capacitor branch directly or indirectly, outputs the reference value of the damp voltage and achieves the stable control on the system. The method provides an adjustable sine control on the DC voltage output and input current through the active damp vector control of the voltage type source rectifier stable control system, the damp voltage reference value outputted by the active damp vector control cell, and the network voltage to execute summation operation. The utility model has the advantages of controllable DC voltage, low aberrance rate of the network input current, high power factor, satisfying the requirement of energy double-redirection flowing, and achieving the stability of the system without increasing the quantity of hardware damp resistance.

A rectifier for rectifying alternating current into direct current is described, in which a three-phase generator includes a three-phase stator winding. The phases of the stator winding are triggered via switching elements of a power circuit. The power circuit is controlled via a control part, which includes a controller component. The rectifier includes a control part (control module) having control terminals and a power circuit (power module) controlled by the control module and optionally provided with a cooling device, in which all the power-conducting components are designed as power MOS components and integrated in a stacked construction.

An AC/DC power converter has an AC input and a DC output, with an input rectifier circuit coupled to the AC input. The input rectifier circuit includes a passive half-bridge rectifier circuit functional to provide passive rectification of an AC input power sign and at least one current shaper circuit. The current shaper circuit includes an input inductor coupled between the AC input and a switch node in the input active rectifier circuit. The input current shaper circuit is functional to shape an AC input current signal associated with an AC input power signal to a substantially sinusoidal current signal. A bulk capacitor circuit is coupled to the input active rectifier circuit. A DC/AC converter circuit is coupled to the bulk capacitor circuit. A resonant circuit is coupled to the DC/AC converter circuit and an output rectifier circuit may be coupled between the resonant circuit and the DC output.

An active integrated rectifier and regulator module for providing charging current to a battery of an automobile including a stacked structure comprising two lead frames disposed above on another, the module including a voltage regulator and elements for active rectification of alternating current from a stator.

The present invention is directed to a power converter that can be used to interface a motor 4 that requires variable voltage at variable frequency to a supply network (bus) providing a nominally fixed voltage and nominally fixed frequency. The power converter includes a first active rectifier/inverter 10 electrically connected to the stator of the motor 4 and a second active rectifier/inverter 14. Both the first and second active rectifier/inverters include a plurality of semiconductor power switching devices. A dc link 12 is connected between the first active rectifier/inverter and the second active rectifier/inverter. A filter 16 is connected between the second active rectifier/inverter and the supply network and includes network terminals. The power converter includes a first controller 18 for the first active rectifier/inverter and a second controller 20 for the second active rectifier/inverter. The first controller 18 uses a dc link voltage demand signal VDC_MOT* indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter 10 to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal. The second controller 20 uses a power demand signal P* indicative of the level of power to be transferred to the dc link 12 from the supply network (bus) through the second active rectifier/inverter 14, and a voltage demand signal VBUS* indicative of the voltage to be achieved at the network terminals of the filter 16 to control the semiconductor power switching devices of the second active rectifier/inverter 14 to achieve the desired levels of power and voltage that correspond to the power and voltage demand signals. The power converter can be employed in a marine propulsion system where the rotor of the motor 4 is used to drive a propeller assembly 2.

The present invention relates to the control of active rectifiers for UPS systems. Aspects of the present invention relate to a control algorithm that is implemented to realize a fast rectifier control operation that results in the improved life of a battery that is linked to the active rectifier of the UPS system. Within aspects of the present invention under unbalanced load conditions, it is possible to select (he desired behavior between the two possible extreme conditions, i.e. implement a clean power input that results in the reduced life of the battery or implement a non-clean power input resulting in the improved life of the battery. Additionally, the present invention utilizes fast rectifier control and specific feed-forward action to make it possible to obtain the very rigid control of a dc link voltage, even under extreme step load variations.

A DC power system includes a permanent magnet generator (PMG), and an active rectifier in electrical communication with the PMG. The active rectifier is adapted to actively rectify power output from the PMG if the PMG is operating at low speed, and the active rectifier is further adapted to passively rectify power output from the PMG if the PMG is operating at high speed.

The present invention discloses a resonant converter and a control method thereof, belonging to the field of the power electronic converter technology. The resonant converter and control method thereof are composed of an input source, an original edge LLC resonance circuit, a transformer, a secondary active Boost rectification circuit and an output load. Based on the traditional LLC resonance converter, the secondary active Boost rectification circuit is substituted for the active Boost rectification circuit so as to realize the fixed frequency phase-shifting control of a converter, the frequency conversion control of the converter and the frequency conversion and fixed frequency phase-shifting combined control to facilitate the design of magnetic elements, reduce the voltage stress of the original edge switch tube and the secondary rectifier tube so as to realize the soft switch of each power semiconductor device, improve the voltage gain range, the efficiency and the power density of the converter and satisfy the requirement of a wide voltage gain margin conversion occasion.

A dual-source multi-mode power supply system includes a battery power supply, a first DC bus, an electric power generating system and a second DC bus. The battery power supply includes a DC-DC converter circuit configured to convert a first DC voltage into a second DC voltage for supplying power to the first DC bus. The electric power generating system includes a permanent magnet generator and an active rectifier circuit configured to convert a variable-voltage/variable-frequency output into a constant high-voltage direct current (HVDC) to supply power to a second DC bus. An electronic coordinated control module determines a load request, and controls one or more switch such that the power from the first DC bus and power from the second DC bus are delivered to the loads to satisfy the load request.

A filter for reducing radiated emissions in switching power converters such as a motor drive is disclosed. The switching power converter modulates a DC voltage input to generate a desired AC voltage output. Capacitors are connected in parallel between each output phase and a common connection, which may be a ground connection. The magnitude and layout of the capacitors are selected to minimize current conducted by the capacitors. The capacitors may be surface mount technology located proximate to the switching devices or the capacitors may be incorporated in the circuit board on which the switching devices are mounted. The filter may be applied to any of the switching elements in a motor drive, such as the inverter section, an active rectifier section, or a switched mode power supply.

A regenerative variable frequency drive includes an active converter connected to a DC bus that is connected to a first inverter that converts DC power to variable frequency, three phase AC power, and variable frequency, three phase AC power to DC power, and to a second inverter that converts DC power to three phase AC sine wave power. The converter converts single phase AC power to DC power and DC power to single phase AC power, and maintains a selected voltage on the DC bus. The converter has an active rectifier and a controller that drives the rectifier with a pulse width modulation according to a hybrid voltage switching scheme that switches the rectifier according to a unipolar voltage switching scheme through most of each cycle and switches the rectifier according to a bipolar voltage switching scheme around each zero crossing.

A three-phase power supply (10), intended especially to supply LEDs system (20), has a system of a diode bridge rectifier which comprises rectifying diodes (101, 102, 103, 104, 105, 106). The three-phase power supply (10) is additionally equipped with FETs and each of the rectifying diodes is bypassed by an FET of a rectifying unit (111, 112, 113, 114, 115, 116), respectively, which is controlled by a control system (40), comprising en anglogue-to-digital converter ADC 403, a digital-to-analogue converter (402), a microcontroller (401), which provides a control signal to a gate of the appropriate FET through the input/output (404). Once the control system (40), in particular the microcontroller (401), detects stable power supply conditions and starts operation of elements of an LED sequencer (30), it starts at the same time to control over the FETs in the active rectifier.

The invention discloses a double-edge lead correction strengthening comparator and an active full-bridge rectifier of the double-edge lead correction strengthening comparator. A pre-amplifier of the double-edge lead correction strengthening comparator comprises a bias current circuit and a common gate amplifying circuit; the bias current circuit is used for providing current polarization for the common gate amplifying circuit; the common gate amplifying circuit is used for amplifying an input voltage and generating quasi digital output; an imbalance generation circuit is used for generating different imbalance voltages in an imbalance current mode, and lead comparison is carried out on a rising edge and a falling edge of the comparator; a double-edge digital latch is used for latching output results of the comparator; a driving stage is used for amplifying output signals of the double-edge digital latch; a feedback control circuit is used for reducing a direct current bias current to improve the efficiency of the rectifier. By means of the double-edge lead correction strengthening comparator and the active full-bridge rectifier, the stability of the double-edge correction comparator is achieved through the double-edge digital latch and feedback control method, quiescent dissipation of the double-edge correction comparator is optimized, and the aim of improving the efficiency of the active rectifier is achieved.