657 results about "Boost converter" patented technology

The invention relates to the technical field of backlight control, in particular to an LED display-oriented adaptive PWM backlight control method and a backlight driving system, which are suitable for the backlight driving system comprising a boost converter, a brightness controller and an LED channel, and the method comprises the following steps: the brightness controller outputs a control voltage, a peak current control word and a duty ratio signal, and receives a state signal. Receiving brightness data, determining a nominal peak current and a duty ratio, and initializing the nominal peak current and the duty ratio; adjusting the control voltage to change the boost output, monitoring the state, locking the working point when all states are converted from the first state to the second state, and taking the final switching channel as a reference; a peak current word is increased for the non-reference channel under the working point, and when the state returns to the first state from the second state, an optimized peak current is taken back; and adjusting the duty ratio according to the ratio of the nominal peak current to the optimized peak current to enable the average current of each channel to be consistent. According to the invention, the problem that excessive voltage drop of a linear current regulator causes extra power consumption and heating and influences the brightness consistency between channels is solved.

The invention discloses a half-bridge ZVS Buck-Boost converter and a control method thereof, and belongs to the technical field of power converters, the half-bridge ZVS Buck-Boost converter comprises a primary side conversion module, a voltage transformation module and a secondary side conversion module, and the primary side conversion module, the voltage transformation module and the secondary side conversion module are connected in sequence; the primary side conversion module comprises a first bridge arm, a second bridge arm, a first inductor and a bidirectional switch, the first bridge arm and the second bridge arm are connected in parallel, a bridge arm midpoint of the first bridge arm is connected with a first end of the first inductor, a second end of the first inductor is connected with a first end of the voltage transformation module, and a second end of the voltage transformation module is connected with a second end of the voltage transformation module. The second end of the voltage transformation module is connected with the bridge arm midpoint of the second bridge arm, the bridge arm midpoint of the first bridge arm is connected with the first end of the bidirectional switch, and the second end of the bidirectional switch is connected with the bridge arm midpoint of the second bridge arm. According to the invention, zero-voltage switching-on of the half-bridge circuit switching tube in a full-input, full-output and full-load range under a constant switching frequency can be realized.

One embodiment relates to A DC / DC converter for boosting an input voltage to a desired voltage and outputting same, comprising: a boost converter for boosting an input voltage to a first voltage; a voltage drop pump for reducing the input voltage to a second voltage; and a charge pump connected to the boost converter and the voltage drop pump, wherein the charge pump generates, as an output voltage, on the basis of the first voltage that is input from the boost converter and the second voltage that is input from the voltage drop pump, a third voltage boosted to be higher than the input voltage.

The invention provides a shutdown control circuit and a switching power supply. The shutdown control circuit comprises a first switching module, a voltage detection module, a comparison module and a second switching module, the first switching module is electrically connected with the drain electrode, the source electrode and the substrate of the synchronous tube, the comparison module is electrically connected with the voltage detection module and the second switching module, and the second switching module is electrically connected with the driving module. When the boost converter is shut down, the first switching module conducts the substrate of the synchronous tube and the source electrode of the synchronous tube according to the gate driving voltage and the drain electrode voltage of the synchronous tube. The voltage detection module outputs a first enable signal when the difference between the output voltage and the input voltage is greater than a preset value. The comparison module outputs a comparison signal to the second switching module according to the input voltage, the output voltage and the first enable signal. The second switching module is switched to the first state according to the comparison signal, so that the power supply voltage is equal to the output voltage. The boost converter can solve the problem that current flows backward from the output end to the input end when the boost converter is shut down.

The invention relates to the technical field of power electronics, in particular to a seamless switching control method for an integrated buck-boost converter, and the method comprises the steps: obtaining the operation state type and input and output voltage information of the converter, preliminarily estimating the switching demand intensity, and determining a switching optimization coefficient. A duty cycle control parameter is initialized based on the optimization coefficient while a current load power level is identified with a voltage current sensor. In combination with load power and initialization parameters, switching interference coefficients are evaluated, the change trend of the switching interference coefficients is analyzed, a dynamic switching control optimization model is established, and optimal duty ratio control parameters are generated; the power switch tube is driven based on the optimal parameters, seamless switching between the Buck mode and the Boost mode is achieved, the problems of duty ratio abrupt change, output voltage fluctuation and inductive current abnormity are effectively avoided, and the stability and reliability of the system are improved.

The invention relates to an MPPT (Maximum Power Point Tracking) method, system and equipment based on distributed photovoltaic and a medium, and relates to the technical field of distributed photovoltaic power generation, and the method comprises the following steps: preprocessing photovoltaic array data, and obtaining irradiance, temperature and MPP voltage data sets; determining the optimal number of hidden layer nodes of the ElmanNN by adopting K-fold cross validation and RMSE evaluation, and dividing a data set into a training set, a validation set and a test set; inputting the training set to firefly algorithm global search and ant colony optimization algorithm local optimization, and defining a stable solution as an FA-EAS optimal parameter after convergence; updating an ElmanNN weight threshold based on the optimal parameter, and deploying a training model to carry out MPP voltage online prediction; and the difference value of the predicted voltage and the reference voltage is input into a PID controller, the control quantity is calculated through incremental PID, a PWM signal is generated to control the duty ratio of the Boost converter, and maximum power point tracking is achieved. According to the invention, the tracking speed, stability and success rate of MPPT can be improved.

A battery pack charger may include a housing. The battery pack charger may include a battery pack interface provided on the housing and configured to removably receive a battery pack. The battery pack charger may include a power input. The battery pack charger may include an LLC converter including a dual transformer electrically connected between the power input and the battery pack interface. The battery pack charger may include a power factor correction (PFC) boost converter electrically connected between the power input and the battery pack interface. The battery pack charger may include an input inrush current control circuit electrically connected between the PFC boost converter and the battery pack interface.

A method for charging a battery pack via an offboard energy source uses an interleaved boost converter and closed-loop control. The energy source outputs a charging current via a DC charge port during a direct current fast-charging (DCFC) process. A controller detects a voltage disparity condition in which a voltage capability of the battery pack exceeds a voltage capability of the energy source. In response to this condition, a rise of the charging current over time is recorded as a current trajectory and an open-loop equivalent time constant is extracted from the current trajectory. A time constant of the PI control block is set substantially equal to the equivalent time constant. The PIM is controlled in closed-loop using proportional-integral control. The charging current is controlled in a continuous current conduction mode during the DCFC process.

The invention belongs to a DC-DC boost conversion technology, and discloses an ultrahigh-gain photovoltaic converter for a high-voltage charging system. According to the ultra-high gain photovoltaic converter, a boost unit is additionally arranged in a traditional two-phase interleaving Boost converter, the first end of the boost unit is connected with the midpoint of one bridge arm of the traditional two-phase interleaving Boost converter, and the second end of the boost unit is connected between an intermediate capacitor and an output diode. The ultra-high gain photovoltaic converter provided by the invention can realize more than 20 times of boost under the condition of a relatively small duty ratio, and has the advantages of automatic current sharing of an input inductor, small input current ripple, and small voltage stress of a switching tube and a diode.

The present invention discloses a switching control method for a Boost converter based on output feedback, belonging to the field of DC-DC Boost converter control technology. The method establishes a state-space switching model of a switching control system, introduces a switching Luenberger observer, observes the system state by sampling the output voltage of the system, designs a switching judgment function based on the observed state, and applies a switching signal to a MOSFET tube through a driving circuit, thereby realizing an output feedback switching control method for a Boost converter. The method of the present application can improve the dynamic characteristics of the system and achieve more flexible control targets. The introduction of output feedback reduces the control cost of the system, and the control target of the system can be achieved only by sampling the output voltage.

A controller includes a current-mode control device configured to determine a turn-on edge of a first gate-drive signal, an on-time timer that includes a first ramp generator having a first current source, a first capacitor, and a first ramp-generation switch, the first ramp generator configured to generate a first ramp signal, and a first logic circuit having an output coupled to a control terminal of the first ramp-generation switch, the first logic circuit configured to control the first ramp-generation switch based at least in part on the first gate-drive signal and on a feedback signal received from the current-mode control device, thereby resetting the first ramp signal, wherein the on-time timer is further configured to determine a turn-off edge of the first gate-drive signal by comparing the first ramp signal with a first threshold voltage that is proportional to an output voltage of the power converter.

The invention relates to an output voltage control system for an intelligent annunciator, a driving system comprises a power supply module, a feedback regulation module and a driving module, the power supply module adopts a two-stage inversion structure, the power supply module comprises a boost converter and an inverter, the feedback regulation module is in communication connection with the boost converter and the inverter, and the driving module is in communication connection with the feedback regulation module. The power supply module is electrically connected with the driving module, the boost converter is electrically connected with the inverter, the driving module is electrically connected with the inverter, and the feedback regulation module adopts fuzzy PI control and is used for regulating the output voltage of the inverter. According to the method, the fuzzy control strategy is adopted, proportional-integral control is combined, the stability of traditional PI control and the adaptive capacity of fuzzy logic are combined, and the precision and robustness of voltage control can be remarkably improved.

The utility model relates to a distributed photovoltaic power station main converter, and belongs to the field of photovoltaic power generation. The main current transformer comprises a T-type three-level current transformer and a Buck-Boost current transformer; one end of the main converter is connected with a power grid, and the other end is connected with a photovoltaic module system and energy storage equipment of the distributed photovoltaic power station; the T-type three-level converter comprises three bridge arms, two output capacitors and the like; each bridge arm is provided with four power switch tubes; the two output capacitors are connected in series, and the connection point is called as the midpoint O of the T-type three-level converter. The Buck-Boost converter comprises a direct current inductor, two power switch tubes and the like; and one end of the direct-current inductor is connected with the midpoint O so as to realize midpoint potential automatic balance. The system is low in cost, simple in control, small in current harmonic wave, low in power consumption, and capable of realizing fast and automatic balance of neutral-point potential, thereby effectively coping with the influence of illumination and network voltage fluctuation on system control, and realizing fast and stable control of a distributed photovoltaic power station.

A power factor correction (PFC) boost converter system and method of operation includes a control system connected to a bridgeless PFC converter which includes a first voltage measurement circuit connected to measure a first voltage, a second voltage measurement circuit connected to measure a second voltage, and a third voltage measurement circuit connected to measure a third voltage, where the control system is connected to compute a reconstructed PFC input current signal from the first, second, and third voltages and to output a set of control signals for controlling the PFC converter based on the reconstructed PFC input current signal and the boosted output voltage.

The invention discloses an inductive current peak control method for a high-efficiency four-switch Buck-Boost converter capable of smoothly switching between a DCM mode and a CCM mode, which belongs to the technical field of a direct-current power transformation control system and is characterized in that smooth switching between the DCM mode and the CCM mode is determined on the basis of energy storage time and direct power transmission time of the four-switch Buck-Boost converter in the DCM mode and the CCM mode; a negative current value-IZVS turned on under zero voltage of a switching tube of the four-switch Buck-Boost converter and a current value of an inductor of the four-switch Buck-Boost converter are compared through a comparator, and follow current time T4 of the inductor current is output; and calculating and outputting control signals of four switches of the four-switch Buck-Boost converter on the basis of the determined duty ratio of the energy storage time in the DCM mode or the CCM mode, the duty ratio of the power direct transmission time, the phase shift delta D between two bridge arms of the converter and the follow current time T4 of the inductive current, so as to realize the high-efficiency control of the peak value of the inductive current of the four-switch Buck-Boost converter.

The invention discloses a DC bus voltage stabilization system and method for an AC / DC micro-grid. The method comprises the following steps: transmitting photovoltaic electric energy to a DC bus through a Boost converter of a photovoltaic power generation unit; a super capacitor energy storage branch and a storage battery energy storage branch of the hybrid energy storage unit are connected in parallel to a direct current bus through independent bidirectional Buck-Boost converters; the direct current bus electric energy is converted into alternating current electric energy through a grid-connected inverter of the alternating current inversion grid-connected unit; after the direct-current bus voltage, the voltage of each unit, the current and the energy storage charge state information are obtained through a sampling link of the special control unit, an adjusting instruction is generated through operation, the direct-current bus voltage is stably controlled, and the stability of the direct-current bus voltage is kept. Through hardware design optimization, the DC bus voltage anti-disturbance capability is significantly improved, and the service life of energy storage equipment is prolonged.

Systems and methods are provided for stabilizing power and voltage in dynamic wireless charging (e.g., of electric vehicles). Systems and methods can use a composite control that combines a backstepping control approach with passivity-based control to stabilize output voltage during movement of the load (e.g., travel of the electric vehicle) and / or changing load conditions. As an example, a Lyapunov function-based control method can be used to regulate output voltage and power by controlling a boost converter at the secondary side. Systems and methods can ensure that the output voltage remains independent of load conditions, while also effectively maintaining smooth power delivery even as the load and mutual coupling fluctuate simultaneously, demonstrating rapid response to varying load conditions and mutual coupling.

The invention belongs to the technical field of inverters, and discloses a three-phase four-leg optical storage converter and a control method and application thereof. According to the three-phase four-bridge-arm optical storage converter, the boost inductor is connected to the midpoints of the three-phase bridge arms through the three switching tubes respectively, device multiplexing of a bidirectional Buck / Boost converter and a three-phase full bridge is achieved, the converter can achieve boost / buck and inversion control at the same time, and then single-stage power conversion among the photovoltaic port, the storage battery port and the load port is achieved; the conversion efficiency and the integration level are improved, and the system cost is low. According to the converter, an SPWM and PWM hybrid control strategy is adopted, the high voltage utilization rate which is the same as that of traditional 3D-SVPWM control is obtained, but a large amount of sector judgment and vector selection are avoided, the calculation burden is remarkably reduced, and the system control complexity is reduced.

A system includes: an alternating current (AC) to direct current (DC) converter (AC-DC converter), the AC-DC converter connectable to a line voltage; and a DC to DC converter (DC-DC converter) connected to the AC-DC converter, the DC-DC converter including: a high voltage buck-boost converter having a secondary side connectable to a high voltage battery; a low voltage buck-boost converter having a secondary side connectable to a low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter, a secondary side connected to a primary side of the high voltage buck-boost converter, and a tertiary side connected to a primary side of the low voltage buck-boost converter.

The invention also discloses an SIDO Boost converter terminal complementary superspiral sliding mode improved active-disturbance-rejection control method. The method specifically comprises the following steps: step 1, establishing a state space averaging model by using a state space averaging method; 2, fitting the state space average model into a standard second-order system normal form; 3, designing a fractional order cascade expansion state observer according to a standard second-order system normal form; step 4, applying the observation value obtained in the step 3 to a terminal complementary sliding mode controller; 5, introducing the super-spiral sliding mode reaching law into the terminal complementary sliding mode; step 6, according to the equivalent control law and the switching control law, obtaining a total control law of the system after summation; and step 7, applying the observer and the controller to a main voltage single closed loop and a branch voltage outer loop and a current inner loop. The problems that a traditional active-disturbance-rejection control method is insufficient in external total disturbance estimation precision of the single-inductor dual-output converter and cross influence exists between two output branches are solved.

To improve the efficiency of a wind power generation system in a wide range of wind speed sections including a low-speed rotation section where the wind speed is low by quickly following an instantaneous change in wind speed.SOLUTION: The wind power generation system includes a lift-type fixed wing fixed to a rotating shaft, a plurality of three-phase AC generators, a step-up / down converter and a resistance load constituting a load of the wind power generator, and a system controller, and the three-phase AC generator has a rectifier unit that converts a three-phase AC output into a DC output. The step-up / down converter may be connected to the rectifier unit, and the system controller may control the load to follow an optimal TSR (λ) suitable for the fixed wing according to a change in wind speed in real time based on a rotation speed of the rotating shaft, information on a super-instantaneous wind speed obtained from an anemometer, an output of the generator, and a state of the load.SELECTED DRAWING: Figure 12

The application discloses a wireless charging circuit for a UAV, a movable electric energy carrier and the UAV. The circuit comprises an electric energy transmitting sub-circuit and an electric energy receiving sub-circuit, the electric energy carrier is configured to perform wireless charging on a power supply of the UAV through electric energy transmission between the electric energy transmitting sub-circuit and the electric energy receiving sub-circuit; the electric energy transmitting sub-circuit comprises a boost converter and a full-bridge inverter to control the operation efficiency of the wireless charging circuit; and the electric energy receiving sub-circuit comprises a receiving switch tube and a receiving diode arranged in series to control the wireless charging circuit to output electric energy at a constant voltage or a constant current to the power supply. The application can switch and adjust the charging mode for the UAV based on the control of the PWM signal on the basis of using the electric energy carrier to perform wireless charging on the UAV in real time, can maximize the operation efficiency of the whole wireless charging circuit and reduce the control complexity of the wireless charging circuit.

The utility model discloses a generator control device, a gas generator system and an aircraft, the generator control device comprises an automatic control unit, a sensing unit and a rectification unit, the generator is connected with a turbine of a turbojet engine through a main shaft, and the generator is connected with electric equipment. The automatic control unit is connected with an oil pump of the turbojet engine, electric equipment, the sensing unit and the rectifying unit, the sensing unit comprises a rotating speed sensor connected with a main shaft, the rectifying unit comprises a diode rectifier bridge and a buck-boost converter, the generator is connected with the diode rectifier bridge, and the diode rectifier bridge is connected with the buck-boost converter. And the buck-boost converter is connected with electric equipment. The power supply can stably output electric energy according to the requirements of electric equipment, ensures that the output voltage is stable, and meets the requirements of the electric equipment.

A device and method for an integrated photovoltaic power module. A module include a photovoltaic cell, a rechargeable battery, an alternating current electrical port, and a microinverter. The microinverter has a first link at a first voltage coupled to the photovoltaic cell, a second link at a second voltage, and a boost converter converting power between the first link and the second link. The module includes a DC-to-AC power converter exchanging electrical power between the second link and the alternating current electrical port at an AC voltage. The module has a battery voltage converter with a battery port electrically connected to the rechargeable battery and a first link port connected to the first link and converting between a voltage of the rechargeable battery and a voltage of the first link.

The embodiment of the invention provides a photovoltaic charging control method and device, a storage medium and a charging system. The method is used for controlling a charging system, and the charging system comprises a PV panel, a PV boost converter and a battery system. The method comprises the steps that before a charging system is started, a first switching tube and a third switching tube are closed, and if it is judged that the short-circuit current of a PV panel is larger than a set current threshold value, the PV panel is controlled to be connected to and activate a battery system; when the charging system enters the working stage, acquiring the voltage of the PV panel and the power supply current of the battery system; power supply current and PV panel voltage are calculated through an improved MPPT algorithm, voltage single-loop given voltage is generated, and the improved MPPT algorithm starts to search the maximum power point when the PV panel voltage is zero; calculating the given voltage of the voltage single loop and the voltage of the PV panel based on a proportional-integral algorithm, and generating switch-on time of a switch tube; and the second switch tube and the third switch tube are controlled according to the switch tube conduction time, so that the hardware cost and the control cost of the charging system are reduced.

The invention discloses a multi-turn-ratio degree-of-freedom magnetic coupling direct-current boost converter, and belongs to the field of power The problems that when an existing traditional Boost converter achieves high voltage gain, the boosting capacity is limited, and the voltage stress of a switching device is large are solved. Compared with the prior art, the multi-winding coupling inductors (N1, N2 and N3) are arranged, the extra design freedom degree is provided by setting different turn ratios, the voltage gain does not only depend on the duty ratio any more, the high voltage gain can be obtained under the medium duty ratio, meanwhile, the voltage stress of the power switch tube is remarkably reduced, and the efficiency and reliability of the converter are improved. The boost converter is mainly used for boost conversion.

The invention discloses a photovoltaic power generation control system, a control method, equipment, a medium and a product, and relates to the technical field of photovoltaic power generation, in the control system, the working mode of a photovoltaic array is determined through a front-stage DC / DC control module according to the maximum available power of the photovoltaic array, the actual output power of the photovoltaic array and the power of the power grid side; the pulse duty ratio is adjusted according to the working mode of the photovoltaic array, and a pulse width modulation signal is generated to control the DC-DC boost converter; transient power suppression is carried out through a post-stage DC / AC control module according to power grid side power and actual output power of a photovoltaic array, direct-current bus extra reference voltage is generated, and PI adjustment is carried out according to the direct-current bus reference voltage and an error value between the direct-current bus extra reference voltage and the direct-current bus voltage. And according to a result output by the second PI regulator and a voltage phase signal, a voltage signal and a current signal of a power grid side, a space vector pulse width modulation signal is generated to control the DC-AC inverter, so that efficient, stable and intelligent management of photovoltaic power generation is realized, and powerful technical support is provided for wide application of photovoltaic energy.

An input signal may be converted to a first PWM signal and a second PWM signal at a PWM controller circuit. The first PWM signal and the second signal output may drive a driver circuit. The driver circuit may receive a high voltage power supply from a boost converter or other power supply circuit. The driver circuit may include a high side device and a low side device. The output of the driver circuit may drive a filter circuit that includes a filter capacitor, an inductor, and a haptic actuator. The haptic actuator may generate a desired haptic response at the haptic actuator.

The invention relates to a BOOT converter soft start circuit for a large-area-array image sensor, and belongs to the technical field of power management. The technical problem of output voltage overshoot caused by overlarge difference between reference voltage and feedback voltage when the BOOST converter is started is mainly solved. According to the technical scheme, a soft start module generates a linearly-increased soft start voltage VSS, and when the VSS is smaller than a reference voltage VREF, the VREF is replaced to be input into an error amplifier, so that a feedback voltage VFB linearly rises along with the VSS, and the surge of an inductive current is restrained. Technical effects include thoroughly eliminating voltage overshoot, maintaining optimal performance parameters of the system, providing programmable startup characteristics, enhancing system reliability, and simplifying integration complexity.

The invention discloses a distributed cooperative control system for a photovoltaic hydrogen production direct-current micro-grid, and relates to the technical field of new energy power generation and power system control, and the system comprises a photovoltaic conversion module which is composed of a photovoltaic array and a direct-current boost converter and converts solar energy into electric energy; the hydrogen energy storage module is composed of an electrolytic cell and the like and achieves energy conversion and storage. The cooperative communication module receives and transmits the key state information and judges a working mode; the distributed optimization control module realizes distributed optimization and cooperative control, and solves and outputs an optimal switch control signal; an integrated cooperative control framework is constructed, a distributed control framework is used for replacing a traditional centralized control framework, the defects of the distributed control framework are avoided, and unification of all modules is achieved; meanwhile, an improved algorithm is introduced, a cost function is incorporated into multiple targets, the priority is scientifically coordinated, the strategy can be dynamically adjusted during fluctuation, waste is reduced, loss is reduced, and the multi-aspect performance of the microgrid is improved.