11 results about "Boost inverter" patented technology

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.

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.

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 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.