2647 results about "Rectiformer" patented technology

A combined power supply and driver control module includes rectifier circuitry, switching circuitry, and driver circuitry for providing output power to a load. Rectified output from an input power source is used to produce a DC power. The switching circuitry receives the DC power and modulates the input current drawn from the power source. An intelligent control module includes control circuitry, such as a digital processor, for controlling the switching circuitry. Power factor is improved by modulating the input current to be closer in phase with the voltage of the power source. Also disclosed is a power factor correction circuit in which a digital processor reads waveform values from a lookup table and modulates the input current waveform based on the values. A zero crossing detector connected to the input power source may direct the digital processor when to commence reading values from the lookup table.

A device (1) for feeding electrical energy from an energy source with variable source voltage into an electric power supply network (15), said device (1) including a transformer (112) for galvanic isolation, a resonant inverter (11) with semi-conductor switches (a-d; A, B), one or several resonant capacitors (17; 18, 19; 20, 21) and one rectifier (113), is: intended to provide high efficiency and have galvanic isolation. This is achieved in that the resonant inverter (11) is operated in the full resonant mode if the operating voltage is in an operation point (MPP) and in the hard-switching mode if the voltages exceed the operation point (MPP).

An electrical tool includes a housing having inlet (7) and outlet (8) openings, a brushless electric motor (2) and an inverted rectifier (3) both arranged in the housing (9) between inlet (7) and outlet (8) openings in an air stream (5) of an air volume (6), and a link condensator (10) located in the housing (9) in the air stream (5), with the inverted rectifier (3) being arranged, in the air flow direction, downstream of the link condensator (10) and upstream of the electric motor (2).

The invention provides an alternating-current brushless generator fault detection method based on an exciter exciting current. The method comprises the following steps: firstly, measuring the direct-current component and each subharmonic amplitude value of the exciter exciting current of a generator set; and then, detecting whether the generator set generates electrical failures or not with a stator winding turn-to-turn short circuit diagnosis algorithm, a rotor winding turn-to-turn short circuit diagnosis algorithm, an exciter fault diagnosis algorithm and a rotary rectifier fault diagnosis algorithm, wherein the electrical failures comprise stator winding turn-to-turn short circuit, rotor winding turn-to-turn short circuit, exciter rotor winding turn-to-turn short circuit, exciter rotor winding interphase short circuit, open circuit of one diode of the rotary rectifier and short circuit of one diode of the rotary rectifier. According to the LabView development fault diagnosis algorithm, various electrical faults can be detected by measuring the exciter exciting current so as to save measurement points, and various invasive sensors do not need to be installed in the generator. The alternating-current brushless generator fault detection method has good instantaneity, and the on-line detection requirement can be satisfied.

A wireless power enabled apparatus includes a wireless power receiver. The wireless power receiver includes a receive coil, a rectifier, a regulator, and a damping circuit. The receive coil is configured to generate an AC power signal responsive to a wireless power signal. The rectifier is configured to receive the AC power signal and generate a DC rectified power signal relative to a rectified ground signal. The regulator is operably coupled with the rectifier to receive the DC rectified power signal and generate an output voltage. The damping circuit is operably coupled between the DC rectified power signal and the rectified ground signal and in parallel with the regulator. The damping circuit is configured to suppress audible harmonics generated by the wireless power receiver at some loads by providing a damping impedance for the DC rectified power signal.

The present invention is a circuit and method for reducing switching and reverse recovery losses in the output rectifiers while creating zero voltage switching conditions for the primary switchers. There are described two output configurations, one employing a soft commutation inductor element a bridge rectifier and a output filter capacitor, the second using a soft commutation inductor element a rectification-filtering bridge composed by two capacitors and two capacitors. Both secondary circuits can be driven by three primary circuits. A first circuit is a full bridge with phase shift control, and a second circuit is a half bridge topology with an additional bydirectional switch which achieves two goals, on to get soft switching commutation across all the primary switches, the second to create the right waveforms in the secondary suitable with the claims in this invention. The third topology is a phase shifted two transistors forward. The circuits claimed in this invention can provide soft commutation across the primary switching elements and secondary rectifier means, clamping the voltage across the rectifiers to the output voltage eliminating the need for snubbers circuits both in primary and the secondary section.

A method and circuit is provided for reducing power consumption in a power transformer, typically incorporated into an electrical or electronic device such as a consumer device. In an embodiment, a detection/isolation circuit is coupled to an input of a power transformer/rectifier via a switching device. The switching device can be, for example, a solid state relay. The detection/isolation circuit is configured to sense the occurrence of no-load conditions in the power transformer and responsively disengage the power transformer from a coupled source of power (e.g., wall outlet) via the coupled switching device.

A method and apparatus for fault detection of series diodes in rectifiers is disclosed, wherein the voltages across one or both of the individual diodes, and/or the voltage across the pair of diodes are measured to determine a ratio between two of those voltages. The ratio is then analyzed to determine if a fault (e.g., a short circuit or an open circuit) is present. In some embodiments, circuitry can be included to compensate for the normal variations in diode characteristics (e.g., reverse leakage current, reverse recovery charge) between the pair of series diodes to minimize the potential for erroneous fault detection.

The invention provides, in some aspects, a power supply that includes a first rectifier circuit configured to receive a first AC input and to generate a first DC output, a second rectifier circuit configured to receive a second AC input and to generate a second DC output, and a storage unit (e.g., a capacitor) configured to store charge from both the first DC and the second DC outputs. The storage unit can itself be configured to supply that stored charge as DC power, e.g., to a computer or other coupled device.

A DC-DC flyback converter that has a controlled synchronous rectifier in its secondary circuit, which is connected to the secondary winding of a main transformer. A main switch (typically a MOSFET) in the primary circuit of the converter is controlled by a first control signal that switches ON and OFF current to the primary winding of the main transformer. To prevent cross-conduction of the main switch and the synchronous rectifier, the synchronous rectifier is turned ON in dependence upon a signal derived from a secondary winding of the main transformer and is turned OFF in dependence up a signal derived from the first control signal. In one embodiment the first control signal is inverted and delivered to a logic circuit along with the voltage across the main transformer secondary winding and the voltage across the synchronous rectifier. In a further embodiment the first control signal is differentiated and supplied to a control primary winding wound on the outer flux paths of a main transformer core that has a center flux path on which is wound the main transformer primary and secondary windings. A control secondary winding is wound on the outer flux paths in current canceling relation as to flux conducted from the center flux path into the outer flux paths. The control signal for the synchronous rectifier is taken from the output of the control secondary winding in this latter embodiment.

The invention discloses an electric vehicle charging system with high power quality. A direct-current charger of the electric vehicle charging system is an electric vehicle charger on the basis of a voltage type PWM (pulse width modulation) rectifier, and a control system of the PWM rectifier is of a double-closed-loop control structure with a traditional outer PI (proportion integration) regulating voltage loop and an inner dead-beat control current loop. Harmonic current which is injected into a power grid by the electric vehicle charging system is reduced, and the power quality of the power grid is improved. Besides, an inverter link is added to the electric vehicle charging system, so that the electric vehicle charging system can be connected with a battery pack to charge the battery pack or can be connected with an air conditioning load for electric discharge according to load change conditions (namely a peak period, a valley period and the like) of the power grid, energy can flow in positive and negative directions, the electric vehicle charging system can run in a rectification state to receive the energy from a power-grid side, can also run in an inversion state to transmit the energy to the load, and runs in an approximate unity power factor state, and the utilization efficiency of power resources is improved.

The invention relates to a transformer used for realizing balanced current output among multipath outputs, aiming at providing a capacitor isolated type multipath constant current output resonant mode DC/DC transformer. The transformer comprises a DC input, a primary-side topology comprising a plurality of switches, a secondary-side rectifier, and a resonance network comprising two resonance circuit branches, wherein each resonance circuit branch respectively comprises one resonance capacitor and one resonance inductor which are connected in series, and each resonance circuit branch is connected between one output end of the primary-side topology and one input end of the secondary-side rectifier. In the invention, a traditional isolated transformer is omitted, therefore, the circuit structure is simplified, the cost is reduced, and simple and efficient multipath constant source outputs are realized; and the invention is particularly suitable for the driving of multi-series LEDs.

The invention discloses a multifunctional current-type bidirectional AC (Alternating-Current)/DC (Direct-Current) converter and a control method thereof. The multifunctional current-type bidirectional AC-DC converter comprises an input filter, a three-phase current type rectifier, a direct-current lateral filtering inductor and an auxiliary switch network; and the AC/DC converter works according to any one of five modes. The AC/DC converter is compact in structure and realizes an energy bidirectional flow function through a smaller quantity of switches; and meanwhile, the system cost can be reduced. If a voltage at a chargeable battery end is lower than a maximum output voltage of the current type AC/DC converter, so that the single-stage charging can be realized and the system efficiency is high. If the voltage at the chargeable battery end is higher than the maximum output voltage of the current type AC/DC converter, the AC/DC converter works in a boosting mode by properly controlling an auxiliary network, and the charging requirements can be satisfied. Therefore, the AC/DC converter has wider voltage applicable range. According to the requirement of a power grid, the topology further can be used for reactively compensating and the like.

The invention relates to a direct current thawing apparatus with a special rectiformer and a protection method thereof. The direct current thawing apparatus with the special rectiformer comprises an alternating current side power supply circuit breaker QF, an isolating disconnect switch K, a rectiformer, valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, a current converter, direct current side voltage transformers Udp and Udn, direct current side current transformers Idp, Idn and Idgnd, and direct current side knife switches S1, S2, S3 and S4. The direct current thawing apparatus has the advantages of reasonable design, low investment and low cost. The protection method ensures the direct current thawing apparatus to satisfy the demand of safe and quick thawing in all circuits, and lowers the investment into the direct current thawing apparatus. The invention has the advantages of ingenious design, favorable performance, low investment, complete protection functions, convenience and high practicality.

The present invention discloses a wireless power energy transmission system and a control method based on parallel energy system load compensation, comprising a transmitting side coil and a receiving side coil, wherein the transmitting side further is provided with a transmitting side inverter connected with a wireless induction coil; and a primary side compensation topology is inputted between the transmitting side inverter and the wireless induction coil; the receiving side coil is connected with a rectifier via a secondary side compensation topology. The back end of the rectifier is provided with two DC converters connected in parallel. The rectifier is able to convert the sensed AC into DC and charges for a super-capacitor and a battery through the two DC converters connected in parallel. With the above structure and the method, the wireless transmission mode is used to provide the power supply to the parallel energy storage system; through the use of a transmitting side inverter, the direct-current power supply is converted into the high-frequency alternating current and an input LCC-S compensation topology is inputted; and the rectifier arranged at the receiving side converts the sensed AC into DC and charges for a super-capacitor and a battery through two Buck converters connected in parallel respectively.

The invention discloses a three-phase rectifier rapid model predictive control method. According to the technical scheme, the method is characterized by including the steps that an output voltage reference value needed by a next moment is acquired according to a three-phase voltage rectifier model and a current reference value, equivalent transformation is conducted on a value function in model prediction control to acquire a value function expression based on output voltage, and lastly an optimal output voltage vector is chosen through a vector zonal method. Specific to the control of a three-phase voltage rectifier, the model predictive control method can effectively simplify the steps of traditional model predictive control. Therefore, the control algorithm structure is simple, calculation amount is small, calculation time is remarkably shortened, response speed of a control system is guaranteed, stable operation of the control system is guaranteed, and conditions are provided for expanding other auxiliary control algorithms.

A method of operating a resonant DC-DC converter is provided where the resonant DC-DC converter includes a high voltage boost LLC circuit. The method includes providing variable power flow control to the LLC circuit with externally determined input and output voltages using frequency control. Frequency control is applied such that it emulates different loading conditions. For fixed input and output voltages this corresponds to operating along horizontal curves on the voltage gain compared to the switching frequency operating plane. A DC-DC converter is also provided including (A) a low voltage full-bridge or half-bridge DC-AC converter; (B) an LLC resonant tank; (C) a high voltage AC-DC converter or rectifier; and (D) a high voltage controllable switch; wherein the high voltage controllable switch is controllable to regulate power flow from an input to an output of the DC-DC converter based on an externally determined voltage gain ratio, wherein the LLC resonant lank operates with a minimum boosting having an effective value above unity over the entire operating range. A method of designing a resonant DC-DC converter for high voltage boost ratio is also provided.

The invention belongs to the field of converter control, and relates to a simplified model forecasting control method of a network voltage unbalance three-level rectifier. The simplified model forecasting control method of the network voltage unbalance three-level rectifier comprises the steps that (1) positive and negative sequence separation is carried out on three-phase network voltage and current to obtain positive and negative sequence components; (2) coordinate transformation is carried out on three-phase positive sequence voltage and current to obtain positive sequence voltage and current under a two-phase static coordinate system; (3) according to the three-phase positive sequence voltage, three levels are changed into two levels in an order reduction mode through reference voltage; (4) an active power reference value and a current reference value are calculated; (5) a current forecasting value of the rectifier, a direct current side capacitance voltage forecasting value and the changing number of switching elements are calculated; (6) current control, neutral-point potential control and switching frequency control are forecast according to a model, and the best switching state is selected. The simplified model forecasting control method of the network voltage unbalance three-level rectifier can effectively suppress double-frequency fluctuation of input power of the rectifier, lower the switching frequency of the elements, shorten circulation calculation time, control neutral-point potential balance, and improve the operation efficiency of the system.

This invention provides a power supply device capable of widening a conduction period of an input current by a simple control to improve a power factor, and reducing a harmonic distortion of the input current The power supply device comprises a rectifier circuit, a reactor, a power factor correction circuit having switching elements, capacitors and a reverse-current blocking rectifier elements, a smoothing capacitor for smoothing an output voltage of the power factor correction circuit to obtain a DC voltage, a pulse signal controller generating and outputting a pulse signal for turning on and off the switching elements, and a driver for receiving the pulse signal to drive a switching elements of the power factor correction circuit.

A generator has a field coil of a rotor, an armature coil of a stator, a control device supplying an exciting current to the field coil when detecting rotation of the rotor, and a control circuit alternately setting an upper arm transistor and a lower arm transistor in on state in a rectifier module to generate a phase voltage. The control device detects the rotation from a periodic change in a sign of the difference between the phase voltage and a reference voltage. When the rectifier module is overheated, the control circuit sets the upper arm transistor in the off state and sets the lower arm transistor in the on state to almost fix the phase voltage, the control device detects no rotation and stops supplying the exciting current, and the rectifier module generates no phase voltage to decrease temperature of the rectifier module.