394 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.

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.

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.

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.

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.

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 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.

The application discloses a bidirectional direct current conversion device and a control method thereof. The bidirectional direct current conversion device comprises a cascaded LLC resonant converter and a half-bridge Buck-Boost converter. The control method comprises the following steps: an LLC current loop obtains an error feedback item through a first controller based on the error between a battery current instruction and a battery current sampling value; the LLC current loop obtains a feedforward quantity by multiplying the battery current instruction by a proportional coefficient; the LLC current loop superimposes the feedforward quantity and the error feedback item to obtain a half-bridge current instruction; a half-bridge current loop generates a duty cycle signal of the half-bridge Buck-Boost converter through a second controller based on the error between the half-bridge current instruction and a half-bridge current sampling value; and a PWM controller drives a switch tube of the half-bridge Buck-Boost converter according to the duty cycle signal. The method can realize fast and high-precision control of the battery current.

The present invention relates to a plasma power supply device for improving harmonic distortion under light-load conditions, and a control method, the device comprising: a power supply unit for supplying single-phase or three-phase alternating current power; a boost converter for controlling an input voltage; a bridge circuit, which receives the voltage controlled by the boost converter in order to provide output power; and a control unit for controlling the operation of the bridge circuit to operate in a first mode or a second mode according to load power required in a load electrically connected to the bridge circuit, wherein the control unit fixes a duty ratio of the first mode at a first load power so as to control the output power, controls the duty ratio of the first mode at a second load power, which is lower than the first load power, so as to control the output power, and switches to the second mode at a third load power, which is lower than the second load power, so as to control the bridge circuit.

The electronic device may include: a first charger including any one of a battery buck converter, a boost converter, or an LDO regulator; a second charger including a power converter that increases an input current supplied from an external device by a specified factor, and outputs the increased current, and decreases an input voltage supplied from the external device by a specified factor, and outputs a reduced voltage; and a processor. The processor can: identify whether an external device can adjust an output voltage and / or an output current based on the external device being connected; supplying a charging current by using a second charger based on the external device being in a state in which the setting of the output voltage and / or the output current is fixed; and supplying the charging current to the battery by additionally using the first charger based on the charging current of the electronic device supplied by the second charger having dropped below a maximum output current value of the external device.

The invention provides a DC-DC boost converter for a photovoltaic charging system and application, and belongs to the technical field of power electronics. According to the DC-DC boost converter, a novel high-gain converter is obtained through topological combination, and the novel high-gain converter comprises four inductors, four switching tubes, two diodes and six capacitors. According to the converter, two non-input inductors work in a bidirectional circulation mode, so that natural turn-off of ZVSs and diodes of all switching tubes is realized, and the conversion efficiency of a system is improved. Meanwhile, the input inductor of the converter equally divides the input current, and a current sensor or complex current-sharing control is not needed. The invention is particularly suitable for high-gain application occasions with high requirements on input current ripple, efficiency, power density and cost, such as a photovoltaic charging system.

An illustrative example embodiment of a buck-boost converter includes at least three input / output ports, at least three switch sets, and at least two ripple current limiters. One switch set is associated with each input / output port. Each ripple current limiter is associated with a corresponding switch set within the switch sets, and each ripple current limiter is located between the associated switch set and the other switch set.

The application provides a control method based on a three-level cascade Buck-Boost converter and an energy storage system. Through a mode switching point threshold calculation method based on flying capacitor voltage and inductance current dynamic characteristics, when switching between different working modes of the Buck-Boost converter, real-time data such as input and output voltages, inductance equivalent parameters and control periods are combined to dynamically determine the inductance current switching point, smooth transition between different modes is realized, the inductance current mutation caused by mode switching is effectively inhibited, the impact on the direct current bus voltage is reduced, and the stability and dynamic response speed of the voltage stabilizing control are improved.

The application discloses an isolated three-level soft-switching boost-buck converter, and belongs to the technical field of power converters. The converter comprises a primary conversion module, an isolated conversion module, a first secondary conversion module and a second secondary conversion module. The second secondary conversion module comprises a first switch, a first end of the first switch being connected to a first end of an output voltage, a second end of the first switch being connected to a first end of a second switch and a first end of a first inductor, a second end of the first inductor being connected to a first output end of the first secondary conversion module, a second end of the second switch being connected to a second end of the output voltage and a second output end of the first secondary conversion module, the first switch and the second switch being complementary to be turned on, and the first switch being turned off when a first inductor current drops to a minimum negative current for realizing soft switching. The application realizes zero-voltage turn-on in a full mode and a load range, minimizes an effective value of the inductor current, and takes into account multiple targets such as high frequency, miniaturization and high efficiency.

Exemplary embodiments of systems, devices, and methods are provided herein for a power supply system configured to generate pulsed power for a load. The power supply system can include cascaded power supply units, each including cascaded power supply cells. Each power supply cell can include a parallel boost converter for regulating a power bus and a buck converter for converting energy on the bus to a regulated output voltage and current.

Charging and updating of an implantable hearing aid is disclosed, wherein an implantable hearing aid system, including a charger unit comprising a coil unit having a first resonant frequency, a hearing aid and an implantable part comprising an implantable coil; the hearing aid comprising: a rechargeable battery; an inductive coil structure having a second resonant frequency, the inductive coil structure configured to form an inductive charging link with the coil unit to receive a power signal from the charger unit; a step-down converter configured to reduce a voltage of the power signal received from the charger unit for charging the rechargeable battery; and a step-up converter configured to increase a voltage of a signal obtained from the rechargeable battery; and wherein the inductive coil structure is further configured to form a transcutaneous link with the implantable coil to transfer at least one of data and power to the implantable part, and wherein the first resonant frequency and the second resonant frequency are matched or partially matched.

A transceiver includes a bidirectional converter, a buck-boost converter and a voltage regulator. The bidirectional converter receives downstream power and converts the downstream power into a rectified voltage. The buck-boost converter converts the rectified voltage into a buck voltage by decreasing a voltage level of the rectified voltage and the voltage regulator converts the buck voltage into a regulated voltage by reducing fluctuations in the buck voltage. In the event that the transceiver outputs upstream power, control circuitry can repurpose the voltage regulator to convert a system voltage into a load voltage by reducing fluctuations in the system voltage, repurpose the buck-boost converter to convert the load voltage into a boost voltage by increasing a voltage level of the load voltage, and repurpose the bidirectional converter to output the boost voltage in the form of upstream power.

The invention discloses a boost converter and a transient response circuit and a control method thereof, and relates to the technical field of switching power supplies, and the boost converter comprises a voltage detection circuit and a control circuit. The circuit comprises a voltage detection circuit and a control circuit, and the voltage detection circuit can monitor abnormal drop or overshoot of the output voltage in real time and immediately generate a level signal. The control circuit responds to the signal and provides a'lead 'or'lag' correction value for the feedback control circuit by modulating the reference voltage, so that the response delay of the system is effectively compressed, and the recovery process of the output voltage is accelerated. On the premise that the original bandwidth and phase margin of a main loop are not changed, the transient response speed is increased, the recovery process of a system is accelerated, and the contradiction that stability and fast transient response cannot be considered at the same time due to zero point limitation of a right half plane of a traditional boost converter is solved.

This invention discloses a high-gain, low-device voltage stress, common-ground non-isolated DC-DC boost converter, comprising: a Stage I hybrid active boost module for front-end boosting, consisting of two inductors, two capacitors, two switching transistors, two diodes, and an input source; a Stage II switched-capacitor boost module for secondary boosting and output filtering, consisting of three capacitors and three diodes; and an output module consisting of a load. This DC-DC boost converter constructs a non-isolated, input-output common-ground converter, achieving extremely high voltage gain without duty cycle limitations, extremely low device voltage stress, and continuously low-ripple input current. The device size is small, compact, lightweight, and easy to control. Furthermore, through specific parameter design, the converter eliminates instantaneous current spikes during mode switching of the switched-capacitor units. Therefore, the converter possesses advantages such as high gain, low stress, low ripple, high reliability, and high power density.

A hybrid active controller for practically asymptotically stabilizing the DC-DC boost converter under parameter uncertainty. The controller uses an estimation algorithm that identifies the input voltage and output load of the converter in finite time. Using these estimates, the control algorithm “unites” global and local control schemes. The global control scheme induces practical asymptotic stability of a desired output voltage and corresponding current, and the local control scheme maintains industry-standard PWM behavior during steady state. Stability properties for the resulting hybrid closed-loop system are established and simulation results illustrating the main results are provided.

The invention relates to an emergency power supply control method and device and emergency power supply control equipment. The method comprises the following steps: acquiring battery running state information of a high-voltage battery of a vehicle, and acquiring running condition information of the vehicle; in response to determining that the vehicle meets an emergency power supply starting condition based on the battery operation state information and the operation condition information, controlling the vehicle to enter an emergency power supply mode, and controlling a boost converter of the vehicle to start working; in the emergency power supply mode, low-voltage electricity output by the low-voltage battery is converted into high-voltage electricity through the boost converter, and the high-voltage electricity obtained through conversion is used for supplying power to a power system of the vehicle; and in response to determining that the vehicle meets an emergency power supply exit condition based on the battery running state information and the running condition information, controlling the vehicle to exit an emergency power supply mode, and controlling the boost converter to stop working. By adopting the method, the low-voltage battery can supply power to the vehicle power system through the boost converter, and the intelligent degree of vehicle emergency power supply control is improved.

A buck-boost converter includes a converter, for converting an input voltage into an output voltage, the converter including a plurality of switches and an inductor, and a controller for controlling the plurality of switches. The operation of the controller is driven by a finite state machine configured to receive as input state change signals and to provide as output state signals for driving the controller. The state change signals are generated by a comparator based on a comparison of a replica signal and an error signal, wherein the error signal is computed on the basis of a signal representative of a difference between a characteristic of the converter and a predetermined reference signal, and wherein the replica signal is representative of the current flowing through the inductor.

The invention belongs to the field of electronic circuits, and provides a bimodal DC-DC conversion circuit, a switching power supply chip and electronic equipment. The circuit comprises a first switch module, a second switch module, a third switch module, a fourth switch module, an inductor module and a capacitor module, the first switch module is connected with the inductor module, the capacitor module and the second switch module, and the capacitor module is connected with the third switch module and the fourth switch module. The third switch module is connected with the second switch module, one end of the output capacitor and the load. The fourth switch module is connected with the inductor module, one end of the input capacitor and the power supply. When the boost ratio of the DC-DC conversion circuit is high, the DC-DC conversion circuit works in a first mode to improve the conversion efficiency; and when the boost ratio of the DC-DC conversion circuit is low, the DC-DC conversion circuit is switched to a second mode, namely the control mode of the traditional Boost converter, so as to adapt to the requirement of wide input voltage.

Method comprising: Determining whether a charging station (126) for charging a battery (116a, 116b) of a vehicle (100) operates in a first high-voltage mode or in a second high-voltage mode; and, in response to the determination that the charging station (126) operates in the first high-voltage mode: enabling an electric motor (120) and a traction power converter (234) of the vehicle (100) to operate as a boost converter to increase an accessory bus voltage of the vehicle (100) while charging in the first high-voltage mode; and charging the battery (116a, 116b) of the vehicle (100) by supplying electrical power at a first high voltage from the charging station (126) to the battery (116a, 116b).