95results about How to "Increase boost capacity" patented technology

The invention discloses a single-stage booster inverter non-isolated grid-connected photovoltaic power generation system. A coupled inductor passive network is introduced to couple the main circuit of the inverter with a power source, the booster function is realized through primary transformation, and at the same time, a fourth diode is added, the electrical connection between the effective vector and the photovoltaic cell end and the power grid side in the traditional zero vector state can be disconnected, so the common mode voltage generation current circuit in the state can be blocked. The invention further discloses a single-stage booster inverter non-isolated grid-connected photovoltaic power generation system control method, in the control method, the adjacent effective vector synthesis pulse width modulation and direct connection control mode is adopted, and the traditional zero vector does not adopted, so the common mode voltage when the traditional zero vector is switched to other states can be eliminated, and the common mode voltage amplitude of the effective vector can be reduced.

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 isolation type new energy power supply equipment based on a three-port power converter. The isolation type new energy power supply equipment consists of a new energy battery, an energy storage device, an inverse resistance diode, two coupling inductors, four main switching tubes, two clamping switching tubes, two clamping capacitors, two rectifier diodes and two filter capacitors which are mutually connected. By adoption of a staggered parallel structure, the phases of the main switching tubes are controlled, and low ripples of the input current can be realized, so that the maximum power point tracking control of the new energy battery is easily realized; and meanwhile, by adoption of an active clamping structure, soft switching of the main switching tubes can be realized, so that the loss is reduced, and the efficiency is improved. In addition, by adoption of the series structure of two coupling inductors on the load side, high boosting capacity can be realized; the new energy battery can supply power to the load side and can supply power to a storage battery during operation; and when the new energy battery does not work, the new energy battery also can supply power to the load side through the storage battery.

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 present invention discloses a kind of Chinese medicine composition of effective components for supplementing qi and restoring pulse, and belongs to the field of medicine preparing technology. The medicine composition is prepared with total ginsenoside and total dogwood glycoside in certain weight ratio. The medicine composition has the functions of invigorating primodial qi, astringing qi, restoring pulse, etc. and is suitable for treating shock caused by different causes, multiple organ failure, coronary heart disease, etc.

The invention discloses an asymmetric boost unit based cascaded boost converter. Primary and secondary windings are used repeatedly, and asymmetric boost units are fused, so that the boost capabilityof the converter is improved greatly; two capacitors and one diode form a novel clamp circuit, energy of a leakage inductor is absorbed effectively, and the efficiency of the converter is improved; and the two capacitors are connected in series to reduce the voltage stress of an output rectifier diode effectively. Three diodes realize zero-current ON, and one diode realizes zero-current OFF.

A single-tap-inductor Z-source inverter belongs to the technical field of an inverter. The single-tap-inductor Z-source inverter settles the problems of relatively low voltage boosting capability caused by short direct conduction time, high device voltage stress, no common-ground, and resonance current in starting in an existing Z-source inverter. A single-tap-inductor Z-source network comprises a capacitor C, an tap inductor L, diodes (D1,D2,D3) and an insulated gate bipolar transistor. The anode output end of a DC power supply is connected with the anode end of the tap inductor L. The middle tap of the tap inductor L is connected with the anode of diode D1. The cathode end of the tap inductor L is connected with the anode of the diode D3. The cathode of the diode D1 is connected with the anode input end of a three-phase inverter, the cathode of the diode D3, the anode of the diode D2 and the emitter electrode of the insulated gate bipolar transistor. The collector electrode of the insulated gate bipolar transistor is connected with the cathode of the diode D2 and one end of the capacitor C. The other end of the capacitor C is connected with the cathode input end of the DC power supply and the cathode input end of the three-phase inverter. The single-tap-inductor Z-source inverter is used for an AC power supply.

The invention discloses a parallel resonant zero voltage switch push-pull forward converter. The main circuit of the converter comprises a primary circuit and a secondary circuit. The primary circuit is internally provided with a resonant inductor and a parallel resonant capacitor. Through the resonance of the resonant inductor and the parallel resonant capacitor, the zero voltage switching of a main power tube in the primary circuit is realized. According to the converter, the voltage spike of the main power tube can be reduced, an EMC effect is improved, and the voltage boost ability and conversion efficiency are improved. The parallel resonant zero voltage switch push-pull forward converter has the advantages of a simple circuit structure, convenient control and reliable working.

The invention discloses a variable-topology Trans-Z-source inverter, which comprises a first Trans-Z-source network, a second Trans-Z-source network, a first DC power source, a second DC power source, a first full-bridge inverter, a second full-bridge inverter, a first filtering inductor, a first AC power source, a ninth switch tube, a tenth switch tube, a ninth diode and a tenth diode. The first Trans-Z-source network is connected in parallel between the first full-bridge inverter and the first DC power source; the second Trans-Z-source network is connected in parallel between the second full-bridge inverter and the second DC power source; and the first DC power source and the second DC power source are connected through the ninth switch tube, the ninth diode, the tenth switch tube and the tenth diode. The Trans-Z-source inverter can eliminate dead zones, realizes single-stage boosting, realizes any multiple of boosting under the condition of small shoot-through duty ratio, can realize switching of two modals and realizes improvement of efficiency.

The invention discloses a compound dual-asymmetric voltage-multiplying unit DC-DC converter, comprising an input power Vin. The positive pole of the input power Vin is connected to one end of a primary winding L1 of a coupled inductor, and the other end of the primary winding L1 of the coupled inductor is separately connected to one end of a secondary winding L2 of the coupled inductor, one end ofa capacitor C4, an anode of a diode D3, and the drain of a switching transistor S. The other end of the secondary winding L2 of the coupled inductor is connected to one end of a capacitor C3; the other end of the capacitor C3 is separately connected to a cathode of the diode D3 and an anode of a diode D4; a cathode of the diode D4 is separately connected to the other end of the capacitor C4 and an anode of an output rectifier diode Do; and a cathode of the output rectifier diode Do is separately connected to one end of an output capacitor Co and one end of a load resistor R. The other end ofthe output capacitor Co, the other end of the load resistor R, and the source of the switching transistor S are separately connected to the negative pole of the input power Vin. According to the DC-DCconverter of the invention efficiency and the ratio of gain are improved.

The invention belongs to the technical field of variable frequency air-conditioners, and provides a variable frequency air-conditioner and a motor control system based on a Z-source converter. The motor control system based on the Z-source converter is that surge generated by the variable frequency air-conditioner in starting is inhibited by a soft start circuit so that power supply switch trip-out and device over-current damage caused by instant over-current of a rectification circuit and the Z-source converter can be prevented. Voltage-boosting capacity is ensured to be enhanced via circuit topology formed by the Z-source converter, a switch tube and a filter circuit when conduction duty ratio of the switch tube is less than 0.5. Meanwhile, a motor is driven to operate via an inverter, and wide-range voltage regulation control and power factor correction control of the Z-source converter are realized via controlling the inverter by a control unit so that a pass-through phenomenon of upper and lower bridge arm switch tubes of the inverter is permitted, working safety of the inverter is enhanced, harmonic influence of dead zone time arrangement on output current of the inverter is eliminated, motor torque ripple is reduced and motor noise is lowered.

The invention discloses a quasi-Z source inverter, which comprises a voltage boosting network, a quasi-Z source circuit and a full bridge inverter which are in sequential connection, wherein the voltage boosting network comprises a first diode, a third inductor, a second diode and a third capacitor, the quasi-Z source circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor and a third diode, the first diode is connected in series between the second inductor and the third inductor, the second diode is connected in parallel between the two ends of the third inductor and the first diode, the third capacitor is connected in parallel at the two ends of the first diode and the second inductor, the third diode is connected between the first inductor and the second inductor, the first capacitor is connected in parallel at the two ends of the third diode and the first inductor, the second capacitor is connected between the negative electrode of a direct current source and the first inductor, and the positive electrode of the direct current voltage source is connected with the inverter. The quasi-Z source inverter has the advantages that the voltage boosting is high and stable, the size is small, the efficiency is high, the capacitor voltage stress is low, and the like.

The invention discloses a control method of a fuel cell hybrid electric vehicle system and belongs to the field of B60W or B60K classification. The fuel cell hybrid electric vehicle system comprises a fuel cell pack, a single-stage boost inverter, a storage battery pack and an electric motor. According to the control method, an upper computer communication module gives out a power instruction according to the different operating situations of a hybrid electric vehicle, and a system control module calculates the power required by fuel cells according to the matching degrees of the fuel cells, storage batteries and alternating current side output power at the previous moment, sends a fuel cell power control signal and direct-connection duty ratio to a fuel cell control module and a motor driving module respectively and controls required input-output powers respectively. A storage battery charge capacity detecting module detects the charge capacity and other information of the storage batteries, and the system control module decides to charge the storage batteries or not through calculation and controls charge and discharge of the storage batteries according to the fuel cell power control signals and the direct-connection duty ratios. By means of the control method of the whole system, the system cost is reduced, and the system reliability is improved.

The invention provides a gamma source inverter based on a switch capacitor and a modulation method, belonging to the technical field of inverters. The problem that the boosting capability of a Z-source inverter in the prior art is limited by straight-through ratio and modulation degree, and when the inverter is started, large resonance current is generated to cause the damage of the device. The gamma source inverter comprises a three-phase inverter, an output filter and a gamma source network module based on the switch capacitor; and the voltage output by a direct-current power supply Vdc is sequentially subjected to spatial voltage modulation by the gamma source network module based on the switch capacitor, the voltage inversion by the three-phase inverter and the filtering by the outputfilter, and a reference voltage vector Uout is output, the direct-current power supply Vdc is boosted, and power is supplied to the load. The inverter is mainly applied to a new energy power supply system.

The invention provides a novel pump impeller. The novel pump impeller comprises a cover plate, a front blade and a rear blade, wherein a connecting part is arranged in the middle of the cover plate; the portable pump impeller is arranged on a power output shaft of an engine through the connecting part on the cover plate; the front end face of the cover plate is provided with at least three front blades at equal angles; the rear end face of the cover plate is provided with at least three rear blades at equal angles; the cover plate, the front blade and the rear blade are integrally formed; the front blade comprises a blade front end part and a blade rear end part; the blade rear end part is bent in the counter clockwise direction; and an included angle is formed between the blade front end part and the blade rear end part. According to the novel pump impeller, the conventional impeller structure is improved, so that a draining pump can reach a high lift just by using a single impeller. Therefore, the impeller can be directly installed on the power output shaft of the engine for use without a shaft coupling, so that the structure of a centrifugal pump can be greatly simplified.

The invention discloses a high-gain bridgeless PFC (Power Factor Correction) convertor based on a coupling inductor voltage-multiplying unit. The high-gain bridgeless PFC convertor based on the coupling inductor voltage-multiplying unit comprises a first coupling inductor, a second coupling inductor, a first main power switching tube, a second main power switching tube, a first output diode, a second output diode, a first clamping diode, a second clamping diode, a first clamping capacitor, a second clamping capacitor, a first freewheel diode, a second freewheel diode, a first voltage-multiplying capacitor, a second voltage-multiplying capacitor and an output capacitor; the first coupling inductor comprises a first winding and a second winding; the second coupling inductor comprises a first winding and a second winding. According to the high-gain bridgeless PFC convertor based on the coupling inductor voltage-multiplying unit, the original inductor is replaced by using the coupling inductor voltage-multiplying unit on the basis of the conventional bridgeless PFC converter topology; high gain is realized through the coupling inductor voltage-multiplying unit; a circuit is prevented from working in an ultimate duty ratio state; the high-gain bridgeless PFC convertor based on the coupling inductor voltage-multiplying unit is suitable for the place which requires the power factor correction and is high in gain.

The invention discloses a photovoltaic system-used cascaded multi-bootstrap DC-DC converter. The photovoltaic system-used cascaded multi-bootstrap DC-DC converter comprises an input power supply Vin;the positive electrode of the input power supply Vin is connected with one end of an inductor L1; the other end of the inductor L1 is respectively connected with the anode of a fly-wheel diode D1 andthe anode of a fly-wheel diode D2; the cathode of the fly-wheel diode D1 is respectively connected with one end of a primary winding L2 of a coupling inductor, one end of a capacitor C1 and one end ofa clamping capacitor Cb; the other end of the primary winding L2 of the coupling inductor is respectively connected with the anode of a fly-wheel diode D4, one end of a capacitor C3, the cathode of the fly-wheel diode D2 and the drain of a switch transistor S; the other end of the capacitor Cb is respectively connected with the cathode of a clamping diode Db and the anode of a fly-wheel diode D3;the other end of the capacitor C3 is respectively connected with the anode of the clamping diode Db and one end of a secondary winding L3 of the coupling inductor; and the other end of the secondarywinding L3 of the coupling inductor is respectively connected with the cathode of the fly-wheel diode D4 and one end of a capacitor C2.

A semiconductor memory device that includes a first high voltage oscillator configured to generate a first control pulse in response to a first enable signal, a level shifter configured to generate a high voltage control pulse by boosting a level of the first control pulse using a source high voltage, and a first high voltage generator configured to generate a high voltage by boosting an external power supply voltage in response to the high voltage control pulse.

The invention provides a ship photovoltaic power generation grid-connected system. The system comprises a solar photovoltaic power generation device which is used for photovoltaic power generation, acapacitance filter which is connected with the solar photovoltaic power generation device and used for converting the pulse direct current output by the solar photovoltaic power generation device intosmooth direct current, an improved high-boost-ratio ship photovoltaic power generation grid-connected Z-source inverter which is a cascaded switch inductance type Z-source inverter and is used for modulating direct current into alternating current through SPWM pulse width modulation; the ship power grid is connected with the output end of the improved high-boost-ratio ship photovoltaic power generation grid-connected Z-source inverter. According to the improved high-boost-ratio grid-connected Z-source inverter ship photovoltaic power generation system, the change fluctuation of the current ship photovoltaic power generation output alternating voltage voltage is effectively reduced, the quality of the output alternating voltage voltage is improved, and the stability of ship grid connectionis ensured.

The invention relates to a tap coupling inductance type non-isolated DC boost converter and a modulation method thereof. The tap coupling inductance type non-isolated DC boost converter comprises a coupling inductor with an intermediate tap, two fully-controlled power electronic switching devices, four power diodes and two capacitors. The circuit topology provided by the invention adopts two modulation modes such as non-conduction modulation and conduction modulation to obtain different voltage gain characteristics. The voltage gain is significantly higher than that of a traditional Boost circuit in conduction modulation, thereby being capable of meeting application requirements in high voltage gain occasions. Meanwhile, the topology contains two symmetrical switching tubes, thereby reducing the voltage stress, and adapting to application requirements of higher voltage grades.