20 results about "Boost inverter" patented technology

The invention provides a charging activation device, an energy storage system and an activation method thereof, and belongs to the technical field of energy storage systems. The charging activation device comprises a standby battery pack, a boost inverter circuit, a voltage acquisition circuit and a microcontroller unit. Wherein the standby battery pack is used for providing a power supply for the boost inverter circuit and the microcontroller unit; the boost inverter circuit is used for boosting the input voltage to an activation voltage threshold of a battery management system of the energy storage system; the voltage acquisition circuit is used for acquiring the output voltage of an energy storage battery of the energy storage system; when the microcontroller unit detects that the energy storage system is in a locked state, the microcontroller unit can control to open the boost inverter circuit so as to boost an input voltage of the boost inverter circuit to an activation voltage threshold of a battery management system of the energy storage system and output the input voltage, so that the battery management system recovers a charging and discharging loop, and the energy storage system is activated. Automatic wakeup of the energy storage battery in the dormant state can be achieved, manual intervention is not needed, and dependence on manpower or external equipment is eliminated.

A transformerless, high efficiency, three-level, high power density, wide input voltage range, single-phase DC / AC inverter is provided. The inverter includes a single DC input power supply, a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, a fourth semiconductor switch, a fifth semiconductor switch, a sixth semiconductor switch, a seventh semiconductor switch, an eighth semiconductor switch, a ninth semiconductor switch, a first inductor, and a second inductor.

The invention discloses a single-phase differential Boost inverter voltage zero-crossing compensation method based on a DSP (Digital Signal Processor). According to the method provided by the invention, the single-phase differential Boost inverter works under a discontinuous modulation strategy, and two Boost circuit modules alternately output positive and negative half cycles of alternating current sinusoidal voltage, so that the differential total output is the required alternating current sinusoidal voltage; wherein in the last switching period before the positive-negative half-cycle switching, the bridge arm switch actively turns off the interrupted current so as to eliminate zero crossing point oscillation caused by the residual energy of the inductor after the positive-negative half-cycle zero crossing point; in a first switching period after negative-positive half cycle switching, an initial pulse is widened for eliminating zero crossing point oscillation caused by inductive current mutation after negative-positive half cycle zero crossing.

This invention proposes a method and system for coordinated charging and discharging of electric vehicles based on energy storage substations. This method is used to solve the problems of transformer overload and three-phase load imbalance during charging and discharging. The core steps include: Step 1: The centralized controller acquires real-time substation operation data and uploads it to the cloud service controller for analysis; Step 2: Determines whether load imbalance and transformer overload exist; Step 3: When load imbalance and substation transformer overload are detected, a substation scheduling and control model is established to optimize the charging and discharging loads of energy storage batteries, AC charging piles, and DC charging piles; Step 4: Finds the optimal load switching scheme based on the model; Step 5: Evaluates the load balance improvement effect; If the load imbalance exceeds the adjustment range or exceeds the transformer load rate threshold, the DC charging pile can be connected to the 10kV incoming line via the second branch boost inverter where the inverter is located.

The invention relates to the technical field of power electronic devices, in particular to a boost inversion device of a following grid type offshore wind turbine generator and a control method. The three-phase rectifier bridge and the Boost chopper circuit are adopted to form the light topological boost rectifier module, an electrolytic capacitor for stabilizing direct current voltage is not needed, the topological structure of the boost rectifier module is simplified, the first control module adopting MPPT + PFC cooperative control is constructed, mutual cooperation is achieved in a capacitor-free scene, and the power supply efficiency is improved. Maximum power tracking and power factor correction functions are achieved, and the problems that in the prior art, a large-capacity electrolytic capacitor needs to be relied on to maintain voltage stability, and consequently the size of a system is increased, and the service life is shortened are solved. Moreover, the post-stage current source type inverter is directly connected to the power grid, and a single current loop tracking mode is utilized, so that the technical problem that the voltage endurance capability of a power device in the system is relatively high on the basis of relatively high direct current bus voltage in the prior art is solved.

The invention belongs to the field of dielectric loss testing, and provides a high-voltage anti-interference multifunctional dielectric loss tester and an operation method thereof.The high-voltage anti-interference multifunctional dielectric loss tester comprises an integrated core function module, and specifically comprises the following components: a measuring module which adopts a high-precision digital signal processing technology and a frequency conversion measuring circuit; the input module is provided with a multi-channel input interface, supports positive wiring, negative wiring, low-voltage magnetic field, high-voltage magnetic field and CVT self-excitation wiring modes, and is compatible with a built-in standard capacitor and an external high-voltage source; and an adjustable high voltage source is arranged in the power supply module. According to the power supply module, the multi-stage boost inverter topology is adopted, digital closed-loop feedback control is combined, through the IGBT switch tube and the high-voltage-resistance boost transformer, 10-180 kV wide-range voltage output is achieved, the voltage steady-state fluctuation is smaller than or equal to + / -0.5%, the testing requirement of ultrahigh-voltage equipment is met, three modes of positive wiring, negative wiring and a CVT self-excitation method are supported, and safety and accuracy are ensured.

The invention discloses a switch capacitor cascade three-phase four-bridge arm boost inverter configuration which comprises a switch capacitor circuit and a three-phase four-bridge arm inverter circuit, and the switch capacitor circuit is connected with the three-phase four-bridge arm inverter circuit. The switched capacitor circuit comprises a controlled switch tube S1, a controlled switch tube S2, a diode D1 and a capacitor C, the positive end of the direct-current voltage source Vdc is connected with the anode of the diode D1 and the collector of the controlled switch tube S1, the cathode of the diode D1 is connected with one end of the capacitor C and the collector of the controlled switch tube S2, and the other end of the capacitor C, the emitter of the controlled switch tube S1 and the emitter of the controlled switch tube S2 are connected with the negative end of the direct-current voltage source Vdc. According to the invention, the switched capacitor boost inverter is adopted, boost can be carried out without using an inductor, and the problems of large inductor weight, high loss, low efficiency and the like of a traditional boost inverter circuit are solved.

The invention relates to the technical field of inverters, in particular to a three-phase voltage source inverter which comprises a direct-current voltage source module, an MOSFET control module 1, an MOSFET control module 2, a phase-shifted full-bridge ZVS direct-current conversion module, a three-phase Buck-Boost inversion module and a load based on the two-stage three-phase voltage source inverter. The phase-shifted full-bridge ZVS direct-current conversion module is adopted in the input stage part, fluctuation of output voltage of a photovoltaic panel is restrained, stable operation can be further achieved, meanwhile, a switching tube of the module can achieve the functions of zero-voltage switching-on and zero-voltage switching-off, and the phase-shifted full-bridge ZVS direct-current conversion module has wide application prospects in the field of photovoltaic new energy power generation-energy storage. Compared with the prior art, the high-frequency inverter circuit has the advantages that the switching tube loss of the MOSFET under the high-frequency working condition is reduced, and the Buck-Boost inverter circuit adopted by the high-frequency inverter circuit has a buck-boost function and a larger voltage output range, so that the high-frequency inverter circuit can flexibly adapt to the power supply requirement of a load end and has a wide prospect in the field of photovoltaic inversion.

The invention discloses a single-phase single-stage nonlinear boost inverter circuit topological structure and a control method thereof. The working modes of the inverter circuit comprise a positive half-cycle sine wave output mode and a negative half-cycle sine wave output mode, and the two modes are switched through turn-on of a pair of complementary power frequency switches. The topology provided by the invention has nonlinear output voltage gain, and the functions of boosting and inverting in a single stage can be realized through reasonable design and distribution of the duty ratio of the switch. Compared with a traditional two-stage voltage source inverter, the topological structure provided by the invention reduces the use of passive elements, and has the advantages of low cost, small size, high efficiency, convenience in control and the like. The single-stage topological structure can simplify the structure of a traditional two-stage inverter, reduces the use of components such as a filter and a controller, and avoids the extra loss of energy in the multi-stage transmission and processing.

This invention relates to a reference sampling phase-locked loop (PLL) adapted for low-voltage applications, comprising: a reference sampling phase detector module, a low-pass filter module, a voltage-controlled oscillator (VCO), a frequency divider module, and a clock signal generation module. This invention achieves normal sample-and-hold functionality by employing a high-level boost inverter to reduce the on-resistance of the sampling switch and decrease the sampling time constant under low voltage. Simultaneously, it allows for the use of a larger sampling capacitor to improve noise, enabling normal sampling operation of the PLL under low voltage and superior clock jitter performance. Furthermore, by adding a low-pass filter at the output of the reference sampling phase detector, high-frequency poles are introduced, improving reference spurious signals without affecting the phase margin. Finally, a combination of a current-mode logic divider and a multi-mode programmable divider is used to ensure normal operation of the reference sampling PLL under low voltage and superior spurious and clock jitter performance.

This application relates to the field of circuit system technology, and in particular to a three-port boost inverter topology and its application. By proposing a three-port boost inverter topology, which achieves operating mode switching through controlled switching transistors, the topology is cascaded with a traditional Boost converter. Based on changes in irradiance, the voltage multiplication characteristic of the capacitor is utilized to expand the irradiance range of the photovoltaic system, thereby increasing the boost ratio and reducing the capacity requirements of the battery. The three-port structure and the clamping characteristics of the capacitor enable simultaneous discharge of the photovoltaic system and the battery. When the output from the photovoltaic system and the battery is insufficient to operate the system, a three-phase inverter is used to step down the photovoltaic voltage to charge the battery. The aim is to reduce the power loss of the three-port boost inverter circuit.

The invention provides a high-performance boost inverter suitable for a WPT system and a soft switching method, and belongs to the technical field of wireless power transmission. The problems that in an existing boost inverter, the number of switching tubes is large, the power level is limited, the inverter is sensitive to parameter changes, and the wide-range operation capacity is weak are solved. The inverter comprises an input voltage Vin, an output capacitor Cin, a first Boost circuit, a second Boost circuit, an output node A and an output node B. The soft switching method comprises the following steps: starting the high-performance boost inverter, and converting a receiving end to a transmitting end; switching tube circulation on-off control of switching tubes in the first Boost circuit and the second Boost circuit is started, the inverter is divided into a working state 1-a working state 8, ZVS opening is achieved through sequential circulation of all the working states, and boost inversion output of the wireless electric energy transmission system is completed.

The application discloses a reference sampling phase-locked loop applied to a low-voltage mode, comprising a reference sampling phase detector, a low-pass filter, a voltage-controlled oscillator, a frequency divider module, a clock generator and a high-level voltage boosting inverter connected in sequence. On the basis of the existing reference sampling phase-locked loop, the high-level voltage boosting inverter is added, the sampling and holding switch is optimized, the on-resistance of the sampling switch is greatly reduced, the time constant of sampling under low voltage is reduced, the normal sampling and holding functions of the sampler under low voltage are ensured, meanwhile, a larger sampling capacitor is allowed to be used to improve noise, the normal sampling work and superior clock jitter performance of the phase-locked loop under low voltage are realized; and the low-pass filter is added to the output end of the reference sampling phase detector, a high-frequency pole is introduced, the reference spur is improved without affecting the phase margin, and the performance of the circuit is improved.

This application discloses an interleaved parallel three-phase single-stage boost inverter and its carrier phase-shift modulation method, device, and medium, relating to the field of power electronic converters. The method includes: generating a three-phase modulation wave, the three-phase modulation wave corresponding to the three-phase output of the interleaved parallel three-phase single-stage boost inverter; generating a carrier signal, wherein the three-phase carrier signal is phase-shifted by 120° sequentially, and the carrier signal corresponding to the two interleaved bridge arms in each phase is phase-shifted by 180°; comparing the three-phase modulation wave with the two carrier signals of the corresponding phase respectively to generate a drive signal for each switch; controlling the on / off state of the switch in each interleaved bridge arm according to the drive signal, so that the interleaved parallel three-phase single-stage boost inverter switches between different operating states, realizing current sharing and ripple cancellation. This application reduces input current ripple, inductor volume, and device stress.

This invention discloses a buck-boost integrated inverter and its control method. The buck-boost integrated inverter includes switching transistors S1, S2, S3, and S4, diodes D1, D2, and D3, and a supporting capacitor C. dc and inductor L in The control method of this invention can suppress the impact of DC input voltage fluctuations on output voltage to a certain extent. It can cope with unstable DC input voltage fluctuations within a certain range. When the DC input voltage is large and the AC output voltage is small, it improves the DC side voltage utilization of the inverter, reduces the withstand voltage requirements of switching transistors S2, S3 and S4, and lowers costs. The buck-boost integrated inverter of this invention can be used as a photovoltaic inverter, realizing the boost inverter function in a single stage. It has high integration and improves efficiency.

The invention relates to the technical field of electronics, in particular to a boost inverter circuit and a driving method. Specifically, the boost inverter circuit comprises a boost module and an inverter module, the boost module comprises a first push-pull unit and a second push-pull unit, the input end of the first push-pull unit and the input end of the second push-pull unit are connected in parallel to form a boost input end, and the boost input end is used for being connected with a direct-current power supply. The output end of the first push-pull unit and the output end of the second push-pull unit are connected in parallel to form a boost output end, and the boost module is used for performing boost processing on first direct current of the direct-current power supply through the first push-pull unit and the second push-pull unit to output second direct current; the inversion module is connected with the boost output end of the DC boost module, and the inversion module is used for carrying out inversion processing on the second DC so as to output the target AC. Current flowing through a single push-pull unit is dispersed through the first push-pull unit and the second push-pull unit which are connected in parallel, so that the current stress of a switching tube is reduced.

The invention belongs to the technical field of converters, and discloses a single-stage three-phase photovoltaic inverter and a control method and application thereof. The inverter comprises an input inductor Lin, a diode D, an input capacitor Cin, an a-phase bridge arm, a b-phase bridge arm, a c-phase bridge arm, a direct current bus capacitor Cdc, an a-phase output filter inductor Lfa, an a-phase output filter capacitor Cfa, a b-phase output filter inductor Lfb, a b-phase output filter capacitor Cfb, a c-phase output filter inductor Lfc and a c-phase output filter capacitor Cfc. The a-phase bridge arm comprises a first switch tube S1 and a second switch tube S2, the b-phase bridge arm comprises a third switch tube S3 and a fourth switch tube S4, and the c-phase bridge arm comprises a fifth switch tube S5 and a sixth switch tube S6. The boost inversion function is achieved through the simple control method, the integration level is high, all the bridge arms are clear in division of labor and easy to control, and the method can be applied to photovoltaic power generation scenes.

The application discloses a single-stage boost-buck dual four-tube Buck-Boost inverter with parallel input and differential output. The inverter comprises a main power circuit and a control circuit, wherein the main power circuit comprises two-phase high-frequency operated four-tube Buck-Boost converters, each phase four-tube Buck-Boost converter is composed of two half-bridges, a main power inductor and filter capacitors on the input and output sides; the control circuit comprises input and output voltage sampling circuits, inductor current sampling circuits, output current sampling circuits, logic gate circuits and single-chip microcomputers; the input sides of the two-phase four-tube Buck-Boost converters of the main power circuit are connected in parallel, and the output sides are connected in differential output, thereby realizing single-stage boost-buck inverter operation in a wide input voltage range. The application widens the input voltage range of the inverter, and has the advantages of high switching frequency, high power density, soft switching of all switching tubes and low inductor current effective value.

The application relates to the field of power electronics, and discloses a single-stage boost inverter, which comprises a left bridge arm, a right bridge arm, a first inductor L3, a second inductor L4, a controller, a first filter capacitor and a second filter capacitor, the left bridge arm comprises a second upper tube S7 and a second lower tube S8, the connection point of the second upper tube S7 and the second lower tube S8 constitutes a left bridge arm output node Vacl, the right bridge arm comprises a first upper tube S5 and a first lower tube S6, and the connection point of the first upper tube S5 and the first lower tube S6 constitutes a right bridge arm output node Vacn. Through the mode that the left and right bridge arms alternately participate in boosting in positive and negative half cycles, the first inductor L3 and the second inductor L4 respectively complete energy storage and energy release in different half cycles, and the reference point of the boost loop is formed in the bridge arm clamping mode, so that the functions of boosting and inverting are realized simultaneously under the single-stage topological structure.

The invention provides a nine-switch three-phase three-level boost inverter with a capacitor voltage self-balancing function and a modulation method of the nine-switch three-phase three-level boost inverter. The topological structure can realize single-stage three-phase three-level boost output, and the topological structure of the inverter comprises an inductor, a diode, nine switches and two capacitors. A specific space vector modulation strategy is adopted, and an upper tube straight-through (UST) state is inserted into an N-type small vector, so that boost conversion of direct-current bus voltage and self-balance of two capacitor voltages are realized. Compared with a traditional two-stage three-level boost inverter or other single-stage three-level boost inverters, the single-stage three-level boost inverter has the advantages that the number of needed passive elements and active switches is small, the voltage gain is high, capacitor voltage self-balancing can be achieved without an additional voltage sensor or a complex control algorithm, the system structure and control are simplified, and the cost is reduced. And the power density and the reliability are improved.