87 results about "Boost rectifier" patented technology

A low input-current-harmonic three-phase three-level boost rectifier includes an input stage for receiving a three-phase input voltage in relation to a neutral node and an output stage adapted to couple to at least one load. The rectifier further includes one or more switching converter stages, each having a plurality of serially-connected switches coupled to the neutral node, one of the serially-connected switches operating with a fixed duty cycle while the other of the serially-connected switches operating with a variable duty cycle, the fixed duty cycle being a substantially 50% duty cycle and the variable duty cycle being less than or equal to a substantially 50% duty cycle. The serially-connected switches are coupled to clamping diodes and clamping capacitors. The rectifier further includes one or more controllers adapted to vary the switching frequency and/or duty cycle of the plurality of switches based on at least one of a condition of the at least one load or the input voltage and includes one or more decoupling stages, each including one or more inductive elements adapted to inductively decouple the output stage from at least one of the one or more switching converter stages.

The invention relates to a double-boost energy-feedback PWM rectifier circuit, which can work in an AC/DC rectification or DC/AC active inverter energy-feedback mode. It is composed of input power supply, two step-up bridge arm circuit units, output filter capacitor and load circuit. The first boost type bridge arm circuit unit is composed of a power switch tube, a power diode and a boost inductor; the second boost type bridge arm circuit unit is composed of a power switch tube, a freewheeling diode and a boost inductor; the output filter capacitor and load The circuit consists of two capacitors and a load. The two step-up bridge arm circuit units work in turn for half a power grid cycle, and the control circuit can select the corresponding step-up bridge arm circuit unit to work according to the positive and negative half cycle judgment of the input current. The energy of this circuit can flow bidirectionally, there is no bridge arm through problem, and the work reliability is high; only one power tube is chopped at high frequency in each switching cycle, and the loss is small. The rectification circuit has good application prospects in UPS, aerospace and other occasions.

A bidirectional buck-boost converter includes at least one soft-switching cell to reduce switching losses by providing soft-switching of all semiconductor devices. A soft-switching cell comprises an active switch coupled in series with an inductor, a two-winding transformer, and a reset-voltage circuit. The soft-switching cells enable the buck and boost rectifiers to turn off with a controlled turn-off rate of their current to minimize their reverse-recovery losses, the power-controlling buck and boost switch to turn on with zero-voltage switching (ZVS), and the switch of the soft-switching cell to turn off with zero-current switching (ZCS).

A switching power supply capable of correcting a power factor without using a shunt resistor is provided. The switching power supply includes a rectifier for rectifying an AC power supply, boosting means including a power MOSFET for boosting an output of the rectifier, a smoothing capacitor for smoothing an output of the boosting means, voltage-dividing resistors for detecting a voltage between main terminals of the power MOSFET, a switch for selecting only the voltage by which the power MOSFET is in on-state from voltages detected by the voltage-dividing resistors, an amplifier for amplifying the voltage selected by the switch and outputting the same as a current corresponding value of a current flowing in the power MOSFET, voltage-dividing resistors for detecting the output voltage, and driving means which form a pulse signal based on the current corresponding value and the output voltage for driving the power MOSFET by the pulse signal.

The invention relates to a control circuit and a control method of a switching buck-boost rectifier with a plurality of modes. Two triangle waves for controlling are used for matching the control circuit with variable load, and a guide circuit for each switch and timing relationship of stop control are designed. At most two switches act within each work period of each mode. The circuit is easy in design and only requires simple digital components such as a comparator and a logic valve rather than a complex analogy circuit.

This invention relates to circuit device suitable for middle and large power, which comprises one communion and one inverter, wherein, the said communion adopts double switch three level lift circuit composed of three-phase circuit composed of six diodes to input three-phase alternating fire line and to convert the three phase current into six wave impulse direct current; the two lift direct to direct current converter is located between the three-phase bridge circuit and two filter capacitor to output direct mother line voltage; each lift direct to direct converter is composed of one inverter inductance, one exchanger switch and one pair of diodes.

An integrated circuit for a continuous conduction mode (CCM) power factor corrected boost converter circuit, the boost converter circuit including a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus; an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier; a boost rectifier diode having a first terminal coupled to the second terminal of the inductor and having a second terminal; and a storage capacitor connected to the second terminal of the diode; the integrated circuit comprising a control circuit and a switch controlled by the control circuit, the integrated circuit comprising a housing enclosing the control circuit and switch, the integrated circuit having a power terminal, a ground terminal, a first control input terminal for coupling to an output of the converter circuit, and a second control input terminal for coupling to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch for coupling to the second terminal of the inductor, wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal.

A new bipolar output boost converter for ac input applications is revealed. The new boost converter is bridgeless, i.e., it does not require use of a line frequency diode rectifier which improves the efficiency of the converter significantly. The new bipolar boost converter does not include the common mode noise generating mechanisms of prior art ac input bridgeless boost rectifier circuits, thereby easing electromagnetic compatibility problems. Although the new converter requires two output filter capacitors, total capacitor stored energy is the same as other boost converters of the same power level so that capacitor volume and cost is not significantly adversely effected. Zero voltage switching cells which can be substituted for a switch to eliminate first order switching losses are also revealed. New three terminal bipolar input source switching networks having operating properties similar to conventional full bridge source switching networks are also revealed.

The invention provides a pulse AC static electricity eliminator, wherein generally a primary booster circuit formed by a transformer does not need better insulating property. In a static electricity eliminator, an output line of a positive polarity high pressure generating circuit is in connection with a negative polarity high pressure generating circuit to alternately apply positive and negative polarity high pressure to shared discharge electrodes. A grounding terminal of a second winding of a negative polarity transformer is grounding and the grounding terminal is not in connection with a negative polarity secondary boosting rectifier circuit.

The invention relates to a three-phase PFC rectifying device of a high-power charging pile with a boost-buck function for electric cars and a control method. The device comprises a rectifying module,a boost-buck module, a sampling module, a hardware voltage and current detection module, a comparator module, a DSP module and a protective switch tube driving module, wherein three-phase network voltage is connected with the rectifying module through pin output ends UA, UB and UC, and the rectifying module and the boost-buck module form a three-phase eight-switch buck-boost rectifier. In the three-phase PFC rectifying device, the three-phase eight-switch buck-boost rectifier is used as a main circuit topology, and double closed loop control is adopted, so that the input current is close to asine wave, the input current and the input voltage are cophasal, and the power factor approximates to 1; the structure is simple, the size is small, the grid-side power factor is high, and the charging efficiency is high; besides, the direct-current side is connected with the buck-boost topology, the output voltage can be flexibly adjusted according to the type of an electric car at the output end, different requirements for the output voltage are met, and the electric cars of different types can be quickly charged.

A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, T_ON(φ)=f1(φ)+f2(φ)+f3(φ). Here, φ defines a phase angle for an input phase voltage of the DCM Boost Rectifier; T_ON(φ) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(φ) defines a first function from 0≦φ≦π/3; f2(φ) defines a second function from π/3≦φ≦2π/3; and, f3(φ) defines a third function from 2π/3≦φ≦π. The switchable booster section is then modulated using the modulation signal.

In some embodiments, a power supply in a doorbell system includes a boost rectifier circuit with a plurality of active devices arranged in a bridge topology that are configured to receive an AC input voltage, generate a DC output voltage by rectifying the AC input voltage, drive an electric load using the rectified DC voltage, and boost an amplitude of the AC input voltage. Two of the plurality of active devices in the boost rectifier circuit may be pulse driven and can control an operation of a mechanical or digital chime device. The chime device can include a solenoid and the boost rectifier circuit may utilize the solenoid as an energy storage element to facilitate the boosting of the amplitude of the AC input voltage. The boost rectifier circuit may boost the AC input voltage by at least a multiplication factor of two.

An apparatus having a rectifier topology for use on a three-phase electrical system is disclosed. The apparatus includes an input filter at each phase, a rectifier set at each phase in power communication with and downstream of each respective input filter, and a separate and independent booster section at each phase in power communication with and downstream of each respective rectifier set. Each booster section comprises two switches, thereby providing a six-switch three-level discontinuous conduction mode (DCM) boost rectifier.

An AC-DC converter with a dual-rectification full bridge interleaved single stage PFC circuit and its control method are disclosed. The converter uses two switching components of a full bridge converter to alternately drive two boost inductors, which eliminates the use of two boost switching components and two boost rectifiers required in a conventional interleaved boost PFC circuit, and also saves individual PWM PFC control circuit.

A power factor corrected boost converter circuit comprising a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus, an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier, an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch, a boost rectifier diode having a first terminal, the first terminal of the diode coupled to the second terminal of the inductor, the diode having a second terminal, and a storage capacitor connected to the second terminal of the diode, wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal, further comprising an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level. Also disclosed is a fan motor speed controller and a housekeeping power supply controller.

The invention relates to a petroleum drilling machine direct current micro-grid system and belongs to the field of petroleum drilling machine equipment. The petroleum drilling machine direct current micro-grid system comprises a power system, a drive system and a direct current micro-grid system, the direct current micro-grid system comprises a peak regulation device, a micro power source and a control device, the peak regulation device comprises a peak regulation motor and a flywheel energy storage device, and the micro power source is connected to the flywheel energy storage device through a rectifier, a direct current bus and a converter. The micro power source is in a parallel connection with a connecting line between the flywheel energy storage device and the peak regulation motor by the direct current bus respectively through a winch energy recovery device rectifier and a boost rectifier. The petroleum drilling machine direct current micro-grid system is specific to features of different loads and pulse loads, power flexible outputting and peak regulation operating function can be achieved, engine capacity can be reduced, and economical efficiency is improved. Meanwhile, the direct current micro-grid system has a function of adaptibility to short time high-power outputting, and large torque of a winch and low-velocity and wide speed adjustable range all-electric driving can be achieved under severe working conditions of jamming of a drilling tool and disengaging.

Systems and methods relating to a boosting rectifier and feeder motor drive circuit are provided. The circuit may be used to produce a regulated DC supply voltage from a variable input AC line voltage, chop the DC supply voltage and deliver a pulse width modulated motor voltage to a wire feed motor in the wire drive assembly. One embodiment relates to elimination of undesirable wire feeder inconsistencies due to motor loading conditions, distance between the primary power source and the wire feeder, and so forth. In certain embodiments, the circuit may contain power factor correction circuitry, which may reduce the size of circuit components due to increased efficiency. Current paths through the circuit during the positive and negative half cycles of the AC input voltage are provided. Exemplary controller logic that may be used to control the operation of the boosting rectifier and feeder motor drive circuit is provided.