149 results about "Boost inverter" patented technology

An electrosurgical generator may reduce unintended tissue damage by improving regulation of output power. The electrosurgical generator may control the power during a cycle, and react to a change in power if arcing occurs. Voltage sources, especially, demonstrate the tendency to have large, uncontrolled power excursions during normal electrosurgical use. The magnitude of the power excursions may be dependent on various factors. An exemplary electrosurgical generator control scheme reduces or minimizes the thermal spread by accurately supplying the specified power within a few cycles. Additionally, fast and accurate regulation provided by the constant voltage mode reduces or minimizes unintentional tissue charring. Thus, reduced thermal spread and charring should result in better surgical outcomes by reducing scarring and decreasing healing times. An electrosurgical generator controller may be configured to control both a DC-DC buck converter and a DC-AC boost inverter based in part on electrical parameters of the electrosurgical generator.

The invention discloses a forward-flyback isolated type boost inverter realized by coupling inductors and application thereof, comprising two power switch tubes, two auxiliary switch tubes, four anti-parallel diodes, a switch tube parallel capacitor, two clamp capacitors, two switch capacitors, two output diodes and two coupling inductors respectively provided with two windings. The invention realizes zero-voltage switching on of the power switch tubes through the resonance of the leakage inductance of the two coupling inductors and the switch tube parallel capacitor, absorbs the voltage peak switched off by the switch tubes caused by the leakage inductance and realizes energy lossless transfer by utilizing a clamp circuit comprising the anti-parallel diodes of the switch tubes and the two clamp capacitors, realizes the high gain output of the inverter by utilizing the serial connection of the second windings of the two coupling inductors, further improves the gain of the inverter and lowers the output voltage stress of the diodes by utilizing the switch capacitors and realizes the output zero-current switching off of the diodes by utilizing the leakage inductance of the coupling inductors.

An improved Single-Stage Buck-Boost inverter (S²B² Inverter) is provided, using only three or four power semiconductor switches and two coupled inductors in a flyback arrangement. The inverter can handle a wide range of dc input voltages and produce a fixed ac output voltage. The inverter is well suited to distributed power generation systems such as photovoltaic and wind power and fuel cells, for standalone or grid connected applications. The inverter has a single charge loop, a positive discharge loop and a negative discharge loop.

A boost inverter includes a first capacitor for connection in parallel with a dc supply voltage; a second capacitor connected in series with the first capacitor; an energy transfer path including a transfer capacitor and switches connected to the transfer capacitor for cyclically transferring energy from the first capacitor to the transfer capacitor and then from the transfer capacitor to the second capacitor; a multilevel inverter circuit connected in parallel with the series combination of the first and second capacitors, the inverter having at least one phase output for connection to an electric motor; and a PWM controller that activates the energy transfer path when a desired peak-to-peak output voltage exceeds the dc supply voltage and deactivates the energy transfer means when the desired peak-to-peak output voltage is less than the dc supply voltage.

The invention discloses a single-stage boosting inverter with a tap inductor, which is shown in a figure described in the specification. The inverter comprises an inversion bridge (B) and a passive network. The passive network comprises an inductor (L), capacitors (C1 and C2), diodes (D1, D2 and D3) and the tap inductor (Lt). A first winding (N1) and a second winding (N2) of the tap inductor (Lt) are connected in series positively. According to the inverter disclosed by the invention, energy is stored in the tap inductor (Lt) by utilizing an ended zero vector state forbidden in the traditional voltage type inverter; the energy is combined with energy supplied by an input power supply in a non-ended zero vector state; and the combined energy is transmitted together to a middle bus so that the voltage of the bus is boosted. Therefore, the inverter can output alternating-current voltage, an amplitude value of which is higher than that of input voltage (Vi); the inverter can satisfy boosting requirements in different application situations by configuring the turn ratio of the tap inductor (Lt); and in the event of being applicable to an alternating-current input situation, the inverter can also realize a power factor correction (PFC) function.

The invention relates to coupling inductance type double-Boost inverter circuits in a photovoltaic system, which comprises two coupling inductance type Boost circuits sharing a direct current power supply, and alternate current output is taken from two coupling inductance type Boost output capacitors. The invention solves the defects of large power loss of a power switching tube, large power loss of a transformer, low conversion efficiency, low utilization rate of photovoltaic generation and the like in a method in which a single-stage inversion circuit is combined to the grid through an industrial frequency transformer boost mode, a DC-DC boosted circuit is at the front stage and an inverter is at the back stage. The invention comprises two coupling inductance type Boost circuits and uses a full-control type device switching tube, so the inversion circuit can realize four-quadrant operation of energy; and under the conditions that the coupled inductance has lower input voltage and smaller duty ratio, the Boost circuits can also output higher voltage, thus the grid-combined inverter of the invention does not need a booster transformer and can realize primary grid-combined generation.

The invention belongs to the technical field of power electronic application, and especially relates to a wide-input direct current inverter topology and a feedforward average current control method thereof. The wide-input direct current inverter topology comprises a two-transistor Buck-Boost inverter and an interleaved two-transistor Buck-Boost inverter. The feedforward average current control method applicable to the wide-input direct current inverter topology is composed of an input voltage feedforward module, a mode switching module, a voltage outer ring and a current inner ring. According to the method, input voltage feedforward is introduced into the current inner ring in average current control, a feedforward function from the input voltage feedforward to the current inner ring is computed, simplification is carried out, thereby obtaining feedforward average current control applicable to practical application, and the input dynamic response performance of the inverters in a whole input voltage range is greatly improved; and moreover, by adoption of an interleaving technology, the conversion capacity is increased, the output current ripple is effectively reduced, and the support is provided for the field with wide range input and high power conversion.

The invention discloses a single-stage boost inverter, and belongs to the technical field of power electronic converters. The single-stage boost inverter comprises power switch tubes S1, S2, S3, S4 and S5, diodes D1, D2 and D3, an inductor L1 and a capacitor C1; one end of the inductor L1 is connected with one end of an input power supply Uin; the other end of the inductor L1 is connected with theanode of the diode D1; the cathode of the diode D1 is connected with the A end of the power switch tube S1, the A end of the power switch tube S2 and one end of the capacitor C1, respectively; the anode of the diode D2 is connected with the other end of the capacitor C1, the power switch tube S3, the C end of the power switch tube S4 and the anode of the diode D3, respectively; and the cathode ofthe diode D2 is connected with the C end of the power switch tube S1, the A end of the power switch tube S5 and the other end of the input power supply Uin, respectively. Aiming at the problem of lowstep-up ratio of the boost converter in the prior art, the single-stage boost inverter is high in integration level and relatively high in step-up ratio.

The invention discloses a vehicle-mounted power battery low-temperature full-time interleaving heating topology circuit and application thereof. The circuit comprises a first battery pack and a secondbattery pack, wherein two Buck-Boost inverter circuits which are connected in parallel are connected in parallel with a to-be-heated battery pack; the Buck-Boost inverter circuits are respectively controlled by two pairs of PWM (Pulse-Width Modulation) signals of which phase angles are different for a set angle; when a single battery of the first battery pack is heated by a first Buck-Boost inverter circuit, a single battery of the second first battery pack is heated by the second Buck-Boost inverter circuit, and thus full-time battery heating is achieved. By adopting the interleaving heatingtopology circuit disclosed by the invention, under the condition that a battery pack is not further damaged, the heating speed can be remarkably increased, and the heating efficiency can be remarkably improved.

The invention discloses a fuel battery hybrid power automobile system, and belongs to the field of B60W or B60K classification. The system comprises a fuel battery pack, a single-stage boost inverter, a storage battery pack and a motor. The fuel battery pack serves as an input power supply (Vin) of the single-stage boost inverter. The single-stage boost inverter is connected with the storage battery pack (Bat) and finally connected to the motor, and comprises a coupled inductor, wherein a primary side winding and a secondary side winding of the coupled inductor are tightly coupled, and the number of turns of the primary side winding N1 is smaller than the number of turns of the secondary side winding N2. An excitation inductor is in parallel connection with the two ends of the primary side winding of the coupled inductor. The cost of the fuel battery hybrid power automobile system can be lowered, the structure of the fuel battery hybrid power automobile system can be simplified, the reliability of the fuel battery hybrid power automobile system can be improved, and the service life of the fuel battery hybrid power automobile system can be prolonged.

The invention discloses a single-stage boost inverter, which comprises a coupling inductor of which a primary secondary-side winding is tightly coupled and N1 is smaller than N2; one end of an excitation inductor is connected with the cathode of a first diode, the anode of a second diode, and one end of a first capacitor, and the other end of the first capacitor is connected with the anode of a third diode; the anode of the first diode is connected with the anode of a power supply; the cathode of the second diode is connected to one end of a secondary-side winding of the coupling inductor; the other end of the secondary-side winding is connected with the cathode of the third diode and the direct current (DC) bus positive terminal of an inverter; one end of a second capacitor is connected with the DC bus positive terminal, and the other end of the second capacitor is connected with the cathode of the power supply; the other end of the first capacitor is connected with the DC bus negative terminal of the inverter and one end of the inductor, while the other end of the inductor is connected with the cathode of the power supply. By employing a shoot-through zero vector which is not allowed by a conventional inverter by the invention, the DC bus voltage of the inverter is boosted, the deficiency of a conventional voltage inverter is overcome, and the inverter is free from shoot-through phenomenon caused by electromagnetic interference, and is not needed to be inserted into a dead area.

The invention discloses a half-cycle modulation method for a double-Boost inverter. The modulation method includes modulation of Boost 1 switching tube and modulation of Boost 2 switching tube in the double-boost inverter. The half-cycle modulation method enables the power switching tubes to work in a half-cycle high-frequency modulation state. The method includes: at an output voltage positive half cycle, the Boost 1 switching tube carries out high-frequency modulation boosting, and the Boost 2 switching tube carries out work frequency switching; and at an output voltage negative half cycle, the Boost 2 switching tube carries out high-frequency modulation boosting and the Boost 1 switching tube carries out work frequency switching. Under the same voltage gain, compared with traditional methods, the half-cycle modulation method enables the voltage and current stresses of the switching tubes to become smaller, the total switch-on times of the switching tubes to be reduced and the switch-on loss to be reduced. The inductive current ripples are reduced and inductive copper loss and iron loss are reduced and the efficiency of the double-Boost inverter is improved.

The invention relates to a single-stage bidirectional buck-boost inverter, which belongs to the technical field of power electronic converters. The input end of the single-stage bidirectional buck-boost inverter is connected with a direct-current voltage source, and the output end of the single-stage bidirectional buck-boost inverter is connected with an alternating-current load. The single-stage bidirectional buck-boost inverter comprises an inverter bridge, an input filter unit, a switching unit and an output filter unit which are sequentially connected. The switching unit comprises a first complementary bidirectional power electronic switch and a second complementary bidirectional power electronic switch. In the buck mode, the second complementary bidirectional power electronic switch is normally switched on, the circuit is equivalent to the conventional buck inverter, and bucked output is carried out; in the boost mode, the first complementary bidirectional power electronic switch and the second complementary bidirectional power electronic switch are complementarily switched on, and boosted output is carried out. The single-stage bidirectional buck-boost inverter disclosed by the invention can carry out boosted output and bucked output without a boost conversion circuit, and also realizes bidirectional energy transmission.

The invention discloses a three-level boost inverter in power electronic field. In the invention, a branch circuit consisting of a first diode and a first capacitor is connected in parallel with a branch circuit consisting of a second capacitor and a second diode and then is connected in parallel with a second switching tube to form a switched capacitor network, a third switching tube is connected with a fourth switching tube, a fifth switching tube is connected with a sixth switching tube, a branch circuit consisting of the third switching tube and the fourth switching tube and a branch circuit consisting of the fifth switching tube and the sixth switching tube are connected in parallel to form a single-phase inverting bridge network, the switched capacitor network produces a multi-level voltage and transmits the multi-level voltage to the inverting bridge network, a knot is drawn from a connecting part of the third switching tube and the fourth switching tube and is connected with an output filtering inductor, the output filtering inductor is connected with one end of an output capacitor, both ends of the output capacitor are connected in parallel with a load, and the voltage at both ends of the output capacitor is an output voltage. The three-level boost inverter also realizes effective direct-current voltage boost while realizing the conversion from the direct-current voltage to the multi-level voltage, and has remarkable boost capacity and adjustable boost transformation ratio.

An active clamping-boosting inverter of high-gain isolation type is prepared as realizing high gain output of said inverter by series-connecting the third winding to output capacity of two coupled inductances, absorbing and transferring leakage energy of two coupled inductances nondestructively by series circuit prepared by the first clamping capacity and the first auxiliary switching tube, utilizing series circuit and parallel capacity to realize zero voltage turn on and turn off of said auxiliary switch.

The invention discloses a pulse width modulation method for maximum boost and minimum switching frequency of a diode-assistant buck-boost inverter. The pulse width modulation method comprises the following steps of: controlling a voltage average value of an intermediate DC side within a switching period (T<s>) to an instantaneous maximum value of an envelope line of three-phase AC output phase voltage, namely line voltage, and thus, the equivalent switching frequency of a power semiconductor device in an inverter bridge can be reduced to 1/3f<s> (f<s> is equal to 1/T<s>). By the method, the voltage gain of the diode-assistant buck-boost inverter is further increased, the voltage stress and the switching loss of a switching device are reduced, and the power conversion efficiency of a converter is improved. Moreover, with the adoption of the modulation method disclosed by the invention, the inductance current and the capacitance voltage of the DC side of the inverter contain low-frequency ripple wave which is six times of fundamental frequency. By the modulation method, the diode-assistant buck-boost inverter is simultaneously applicable for distributed power supply systems such as 400-800Hz middle-frequency airborne and boat.

The invention discloses a boost inverter, and belongs to the technical field of power electronic converters. A positive electrode of a power supply Uin is connected with one end of a boost inductor L, a negative electrode of the Uin is grounded, the other end of the boost inductor L is connected with the first end of a switch tube S1, the first end of a switch tube S2 and one end of a capacitor C2, the second end of the switch tube S1 is grounded, the other end of the capacitor C2 is connected with the first end of a switch tube S4 and the second end of a switch tube S6, and the second end of the switch tube S4 is grounded. The second end of the switch tube S2 is connected with one end of a capacitor C1 and the first end of a switch tube S3, the other end of the capacitor C1 is grounded, the second end of the switch tube S3 is connected with the first end of the switch tube S6 and the second end of the switch tube S5, and the first end of the switch tube S5 is grounded. For the problems that a traditional boost inverter has high frequency leakage current, and the conversion efficiency is low, the conversion efficiency of the boost inverter is high, and no high frequency leakage current exists.

The invention relates to a portable rechargeable microsecond pulse power supply. The structure includes a lithium battery pack, a direct current boosting inverter module, a silicon controlled voltage regulation module, a rectification and filtering module, a pulse transformer, a high voltage microsecond pulse output, a PWM signal generator, an IGBT driver board and an IGBT; the lithium battery is connected with the input end of the direct current boosting inverter module, the output end of the direct current boosting inverter module is connected with the input end of the silicon controlled voltage regulation module, the silicon controlled voltage regulation module is connected with the input end of the rectification and filtering module, the output end of the rectification and filtering module is connected with the first input end of the pulse transformer, and the tail end of the pulse transformer is provided with the high voltage microsecond pulse output; and the output end of the PWM signal generator is connected with the input end of the IGBT driver board, the IGBT driver board is connected with the input end of the IGBT, and the output end of the IGBT is connected with the second input end of the pulse transformer. The advantages are as follows: (1) the portable rechargeable microsecond pulse power supply does not need to be electrified when used, is small in volume and convenient to carry; (2) the power supply can realize long-time no-load operation; and (3) the power supply adopts modular design, is simple in structure and is low in cost.

The invention discloses a CCM single-bridge-arm integrated single-phase boost inverter and a control method. Compared with a traditional Boost integrated boost inverter, the inverter provided by the invention has the advantage that high-gain boost inversion in a CCM mode is realized by only additionally arranging one inductor, one capacitor and one diode. Because the input current is continuous, the current stress and the on-state loss of the inductor and the power tube are greatly reduced, the boosting capability does not change sharply along with the load power, and the system reliability isimproved; moreover, the boost bridge arm can adopt PWM control for voltage regulation, so that the inverter is suitable for various boost inversion occasions where the output power cannot be adjustedand the input voltage changes in a wide range such as photovoltaic power generation and independent inversion, and the application range is wider. In addition, the inverter also has the advantages ofstrong boosting capability, high conversion efficiency, low capacitor voltage stress, simple structure, low cost and the like.

The invention discloses a converter and a modulation method thereof, and belongs to the technical field of power electronic converters. One end of the DC side of the converter is connected with one end of an inductor Lin, the other end of the inductor Lin is connected with a terminal 1 of a power switch transistor S1 and a conduction end of a switching device, a cut-off end of the switching deviceis connected with terminals 1 of power switch transistors S2, S4 and one end of a capacitor C1, the other end of the capacitor C1 is connected with terminals 2 of power switch transistors S3, S5, theother end of the DC side of the converter, terminals 2 of the power switch transistors S1, S2, a terminal 1 of the power switch transistor S3 and one end of the AC side are all grounded, a terminal 1of the power switch transistor S5 and a terminal 2 of the power switch transistor S4 are connected at the other end of the AC side. In addition, the invention further provides a corresponding modulation method, a bidirectional converter and a corresponding modulation method thereof. In allusion to a problem of high-frequency leakage current existing in the traditional boost inverter, the converter disclosed by the invention has the advantages of high integration degree and small volume and can effectively solve the problem of high-frequency leakage current.

The invention belongs to the technical field of inverters, and discloses a zero-voltage soft-switching single-phase boost inverter and a control method. The inverter comprises two auxiliary switch tubes, a first inductor L1, a first bridge arm, a second bridge arm and an auxiliary branch, wherein the two auxiliary switch tubes are conducted in a complementary mode, and the auxiliary branch is composed of a first direct-current bus capacitor Cdc1, a second direct-current bus capacitor Cdc2 and a second inductor L2. In a positive half power frequency period, the first bridge arm works in an SPWMmode, and the second bridge arm works in a PWM mode; and in a negative half power frequency period, the working states of the first bridge arm and the second bridge arm are exchanged. According to the inverter, zero-voltage soft switching of two bridge arm lower tubes and one bridge arm upper tube is realized, the problem of serious reverse recovery loss of an anti-reverse diode in a traditionalintegrated inverter is effectively solved, and the conversion efficiency is improved.

This invention relates to distribution generation system single buck to boost inverter, which adopts High frequency reverse interfere through main self-switch, first assistant switch tube and second assistant switch tube PWM to control its single inverter and uses basic Bick to Boost DC to DC circuit and combines two Buck t oBuck DC to DC circuits together to realize buck and boost to get new type of single inverter.

The invention discloses a three-phase Boost integrated boost inverter and a hybrid modulation method thereof. The boost inverter includes a DC power supply Uin, a boost filter capacitor Cin, anti-reverse diodes D1-D3, a boost inductor L1, switches S1-S6, filter inductors Lo1-Lo3, filter capacitors Co1-Co3 and a load resistor R. The specific modulation method adopts a three-phase hybrid SPWM modulation method comprising three driving signals of SBoost, SSPWM and Tn. The three driving signals are input into a logic operation circuit, and finally the output control of each switching tube is performed, wherein SBoost is used to control a DC bus voltage, SSPWM is used to control the inversion of an inverter, and Tn is an interval decision signal. The inverter of the invention integrates a Boostconverter and a three-phase voltage type full-bridge inverter, and has the advantages of high voltage gain, small output voltage THD, and small boosting inductance.