1079 results about "Boost converter" patented technology

A method for actuating a DC-to-DC converter, in particular a clocked buck-boost converter that includes at least two switch elements and an inductor or throttle and via which an input voltage is converted into a regulated output voltage, wherein the switch elements are actuated with a variable switch frequency using pulse- and frequency-modulated control signals, where the pulse- and frequency-modulated control signals are derived from a manipulated variable from a regulator, a voltage curve on the switch elements is continuously ascertained or monitored to determine the activation time of the switch elements and to start a new switch cycle, the switch elements are activated if a specified minimum period duration has been exceeded upon detecting a voltage minimum of the ascertained voltage curve on the switch elements.

The invention relates to the technical field of battery management, and discloses an equalizing charging method, device and equipment for a power battery pack. The method comprises the following steps: performing parameter acquisition on a power battery pack, measuring terminal voltage values, temperature values and charge and discharge current values of each single battery, and calculating a state-of-charge value and an internal resistance change rate of each single battery; inputting into a multi-head self-attention network for feature extraction, and generating a state correlation feature matrix; constructing an Actor network and a Critic network based on the state correlation characteristic matrix, and outputting an equalization current value, a constant-current or constant-voltage equalization mode and equalization time through the Actor network; according to the equalization current value, the equalization mode and the equalization time, the DC-DC converter in the main equalization loop is controlled to generate constant current output, or the Buck-Boost converter in the secondary equalization loop is controlled to generate constant voltage output, the equalization efficiency of the power battery pack is guaranteed, meanwhile, energy loss is reduced, and temperature self-adaptive control over the equalization circuit is achieved.

A system includes: an AC-DC converter; and a DC-DC converter, the DC-DC converter including: a first high voltage buck-boost converter having a secondary side connectable to a first high voltage battery; a second high voltage buck-boost converter having a secondary side connectable to a second high voltage battery; a first low voltage buck-boost converter having a secondary side connectable to a first low voltage battery; a second low voltage buck-boost converter having a secondary side connectable to a second low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter and a secondary side connected to each of a primary side of the first high voltage buck-boost converter, a primary side of the second high voltage buck-boost converter, a primary side of the first low voltage buck-boost converter, and a primary side of the second low voltage buck-boost converter.

The APSO-SA-based photovoltaic system maximum power point tracking control method comprises the following steps: constructing a photovoltaic system model, and carrying out parameter and particle swarm initialization on a preset APSO-SA algorithm in MPPT control; voltage and current of the photovoltaic system model are collected in real time, the initialized APSO-SA algorithm is input for optimization iteration, and the optimal duty ratio is obtained; and adjusting the working state of the boost converter based on the optimal duty ratio, so that the photovoltaic system operates at the optimal duty ratio, and tracking of the maximum power point is realized. According to the method, the MPPT system can rapidly relocate the maximum power point when illumination suddenly changes, meanwhile, high-precision tracking is maintained in a steady state, and the energy capture efficiency of a photovoltaic system is remarkably improved.

The invention relates to a BUCK-BOOST converter control circuit, a control method and a safety air bag chip, the peak value of inductive current is detected through a current sampling compensation module, stable control of output voltage is achieved, the dynamic response speed is high, the loop stability is good, and meanwhile the circuit structure is simple. According to the BUCK-BOOST converter, stable switching of the working modes of the BUCK-BOOST converter is achieved through the mode control module, and it is ensured that the BUCK-BOOST converter can still work normally under the high voltage level. And the slope compensation unit is introduced into the circuit, so that subharmonic oscillation can be effectively prevented when the duty ratio of the PWM signal is greater than 50%, and the stability of the system is ensured.

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.

A power management circuit is disclosed that includes a boost converter, a pass transistor, and an overcurrent detect circuit. The boost converter is configured to convert an input voltage into a first power supply voltage. The pass transistor is configured to transfer the first power supply voltage as a second power supply voltage after a predetermined time from a time point at which the first power supply voltage is activated. The overcurrent detect circuit is configured to perform an overcurrent detect operation by sensing a current flowing through the pass transistor. A display device is also disclosed that includes the power management circuit.

In a power conversion device, a control circuit sets an output voltage of a boost converter to a first output voltage level or a second output voltage level in accordance with a voltage corresponding to the input voltage, causes an electric current resonant converter to operate in a full-bridge mode as an operating mode when the first output voltage level has been set, and causes the electric current resonant converter to operate in a half-bridge mode as an operating mode when the second output voltage level has been set. The first output voltage level or the second output voltage level is set at a predetermined timing after the input voltage is input and a set operating mode is maintained until a process of setting the first output voltage level or the second output voltage level is reset.

The invention provides a method for controlling the output power of a hybrid energy storage system, and the method comprises the steps: building a nonlinear state-space equation through a switching function model of a reconstruction type bidirectional Buck / Boost converter, and deducing a prediction model of the output power of the system. On the basis, a differential algebraic coupling model of output power and inductive current is constructed, and a power prediction problem is converted into an inductive current control problem. Aiming at the operation characteristics of the hybrid energy storage system, a cooperative control architecture in which a supercapacitor preferentially responds to transient power and a storage battery dominates steady-state power supply is designed, and a time-varying reference power track is generated by monitoring the operation state of the system in real time and fusing a target function curve. A model prediction control algorithm is introduced, rapid tracking of reference power is achieved in a rolling optimization mode, and power distribution time sequences of different energy storage units are effectively coordinated. According to the method, the operation economy optimization is realized while the system reliability is improved, and an innovative solution is provided for cooperative control of the energy storage system in the intelligent power grid.

The present invention discloses a boost converter power stage circuit, comprising: an organic light-emitting diode power management integrated circuit unit, a switched capacitor converter, and a boost converter, wherein, a flying capacitor is used to boost the voltage of the inductor to twice the voltage, and then the positive voltage of the output voltage source is boosted, and then use the switched capacitor converter to output the voltage in order to obtain the conversion of the negative voltage.

A bootstrap device used for first and second transistors of a buck-boost converter includes first and second bootstrap circuits. The first bootstrap circuit generates a first bootstrap voltage, and determines, based on a change among a first switching voltage, a voltage level of a source terminal of the first transistor and the first bootstrap voltage, whether to charge according to at least one of a DC input voltage, a DC output voltage, and a second bootstrap voltage. The second bootstrap circuit generates the second bootstrap voltage, and determines, based on a change among a second switching voltage, a voltage level of a source terminal of the second transistor, and the second bootstrap voltage, whether to charge according to at least one of the DC input voltage, the DC output voltage, and the first bootstrap voltage. The bootstrap device improves charging efficiency of bootstrap capacitors.

The invention relates to a distributed photovoltaic power station main converter and a control method thereof, 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; 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. And one end of a direct-current inductor of the Buck-Boost converter is connected with the midpoint O. The T-type three-level converter adopts PI control and a carrier pulse width modulation strategy to realize alternating current side current harmonic wave minimization of the T-type three-level converter; the Buck-Boost converter adopts a PI control method to realize neutral-point potential automatic balance control. The method is small in current harmonic wave, low in cost and simple to control, and can realize quick and automatic balance of the neutral-point potential, thereby effectively coping with the influence of illumination and power grid voltage fluctuation on system control, and realizing quick and stable control of the distributed photovoltaic power station.

A system comprises: a high voltage (HV) direct current (DC) to DC converter (HVDC) including: one or more transformers; a bridge driver connected to a primary side of the one or more transformers; and one or more bridge rectifiers connected to a secondary side of the one or more transformers, the one or more bridge rectifiers including one or more bridge rectifier switches; a low voltage (LV) DC to DC converter (LVDC) connected to the HVDC; and a boost converter including: an inductor connected to the one or more bridge rectifier switches; and one or more boost configuration switches operable, in combination with the one or more bridge rectifier switches, to configure the boost converter into each of a bypass configuration and a boost configuration, to regulate a voltage at the LVDC.

The invention discloses a photovoltaic module fault cause determination method and device, a storage medium and an electronic device, and the method comprises the steps: obtaining the operation data of a photovoltaic module in the operation process, and the operation data at least comprise one of the first operation data of a photovoltaic array and the second operation data of a boost converter, third operating data of the inverter; inputting the operation data into a fault detection model to obtain a fault reason output by the fault detection model, the fault detection model being obtained by training with historical operation data as an input sample and historical fault reasons as output samples, the model parameters of the fault detection model are obtained through optimization based on a golden eagle optimization algorithm. By adopting the technical scheme, the technical problem that the fault reason of the photovoltaic module cannot be comprehensively and accurately judged is solved, and the accuracy and comprehensiveness of the fault reason of the photovoltaic module are improved.

A power factor correction circuit for a boost converter comprises a voltage converting means and a voltage-to-time converting means. The voltage converting means converts a supply voltage based on a time period of a turn-on duration Ton and a turn-off duration Toff of the boost converter into an output voltage. The voltage-to-time converting means generates the turn-on duration Ton based on the output voltage from the voltage converting means. The power factor correction circuit adjusts the turn-on duration Ton substantially in accordance with the following relationship:Ton =TTon +T off⁢first⁢ parameter second⁢ parameterThe first parameter includes at least one first process-dependent parameter and the second parameter includes at least one second process-dependent parameter. The first process-dependent parameter and the second process-dependent parameter are same electrical characteristic associated with different circuit components in the power factor correction circuit.

The invention discloses a series battery pack active equalization circuit based on a Boost converter. The equalization circuit comprises an n-path output boost converter, n-1 bridging capacitors and n battery units, the n-path output boost converter comprises an inductor L, a power switch S, a first-path output diode D1 and a first-path output capacitor C1; the circuit comprises a first-path output diode D1, a second-path output diode D2, a second-path output capacitor C2, a first-path bridging capacitor Cp1 and a first-path clamping diode Dp1. A third output triode D2, a third output capacitor C3, a second bridging capacitor Cp2 and a second clamping diode Dp2; and the like, an nth output diode Dn, an nth output capacitor Cn, an (n-1) th bridging capacitor Cp (n-1) and an (n-1) th clamping diode Dp (n-1). According to the invention, automatic voltage sharing among the battery units is realized through the bridging capacitor, no complex sampling and control algorithm is needed, the problem of terminal voltage imbalance caused by cross adjustment rate during multi-winding output of the transformer is avoided, the voltage deviation is effectively reduced, and the battery equalization precision is improved.

A DC-DC boost converter includes an input receiving an input voltage and an output producing an output voltage. A switching stage is formed by a low-side transistor arranged between a switching node and a ground node, and a high-side transistor arranged between the switching node and the output. The high-side transistor includes a body diode having an anode coupled to the switching node and a cathode coupled to the output. The converter is controlled in an asynchronous operation mode where the low-side transistor is driven alternately to a conductive state and a non-conductive state, and the high-side transistor is driven steadily to a non-conductive state. A variable load circuit is selectively coupled between the two output terminals when the converter is in the asynchronous operation mode in order to sink a load current having a value that is a function of a value of the input voltage.

The invention provides a fixed frequency Boost converter control method, system and device and a medium, and the method comprises the steps: building a corresponding circuit mathematical discrete model according to the circuit topology of a converter; based on a system power balance principle, correcting the circuit mathematical discrete model to obtain a converter prediction control model; according to the converter predictive control model, a predictive control cost model is constructed based on a predictive error minimization principle; according to the predictive control cost model, constructing a duty ratio signal output model based on a minimum predictive control cost principle; obtaining a real-time optimal control output voltage according to a pre-constructed converter passive control model, and inputting the real-time optimal control output voltage into the duty ratio signal output model to generate an optimal duty ratio signal; and controlling the converter to operate according to the optimal duty ratio signal. According to the invention, the dynamic response speed and anti-interference performance of the system can be effectively improved, and reliable guarantee is provided for the dynamic performance of the converter.

The invention provides a boost converter controlled in a PFM mode and a zero cross detection circuit thereof. The zero-cross detection circuit is composed of a biasing circuit and a three-stage comparator. In the three-stage comparator, the first stage adopts a common-gate circuit, receives zero-cross detection two-end input, and adapts to a wide input range; the second stage is a push-pull amplifier, receives the output of the first stage, and accelerates the overturning speed through push-pull input and output; and the third stage is responsible for outputting a zero-cross detection comparison result. The boost converter system comprises a mode switching unit, a switch logic control unit, a driving control unit and a main circuit. The mode switching unit judges whether to enter a PFM mode or not according to the zero-cross detection circuit signal; the switch logic control unit outputs a logic control instruction according to the signal; the driving control unit controls the on and off of the N-type power tube and the P-type power tube in the main circuit according to the instructions. The control mode is combined with high-precision and high-speed zero-cross detection, so that the stability and the response speed of the system are remarkably improved.

The invention discloses a peak current and valley current controlled three-mode buck-boost converter, which comprises a power level circuit, an error amplifier, a slope compensation module, a current sampling module, a PWM (Pulse Width Modulation) comparator, a mode control module and a switching control module, and is characterized in that the power level circuit obtains an output voltage according to an input voltage and outputs a sampling voltage; the error amplifier outputs a control signal according to a comparison result of the sampling voltage and the reference voltage; the mode control module outputs different enable signals according to the states of the input voltage and the output voltage; the slope compensation module outputs different compensation voltages when the converter is in different modes; the current sampling module collects the voltage of peak current or valley current according to different modes; the PWM comparator generates a PWM control signal; the switching control module generates a driving signal according to the PWM control signal and different enable signals so as to switch different modes. The mode switching efficiency can be improved, the duty ratio can be reduced, and then output voltage ripples are reduced.

The boost converter control device includes a plurality of boost converters connected in parallel to each other with respect to the secondary batteries, and an ECU (control unit) that controls each of the plurality of boost converters. When warm-up of the secondary battery is required, ECU performs a first control for adjusting the phases of the plurality of boost converters to be in phase with each other in response to the current value flowing through the secondary battery becoming larger than a predetermined threshold, and performs a second control for stopping the operation of a part of the plurality of boost converters in response to the current value flowing through the secondary battery becoming equal to or smaller than the predetermined threshold.

The invention belongs to but is not limited to the technical field of electrical control, and particularly relates to a DC-DC converter control method and system based on adaptive droop control, and the method comprises the steps: deducing a corresponding mathematical model before designing a controller of an interleaved multi-level boost converter; the original nonlinear model can be converted into a regular linear form by using the new state variable; the converted reduced-order model is equivalent to the differential homomorphism of the reduced-order model, a control target can be changed, and the total storage energy gradually tracks a reference value of the reduced-order model; aiming at a state variable and a disturbance quantity in an established system model, designing a self-adaptive sliding-mode observer which can compensate a disturbance influence in a feedforward mode; controlling a state variable by using a sliding mode controller based on a disturbance observer; a phase current balance compensator is designed, wherein simple and effective phase current balance compensation is adopted in a closed-loop interleaving multi-level boost converter system; a typical distributed control strategy, namely droop control, is added in the system.

The present invention relates to the technical field of battery management, and discloses a method, device and equipment for balanced charging of a power battery pack. The method includes: collecting parameters of the power battery pack, measuring the terminal voltage value, temperature value and charge and discharge current value of each single battery, and calculating the state of charge value and internal resistance change rate of each single battery; inputting into a multi-head self-attention network for feature extraction to generate a state correlation feature matrix; constructing an Actor network and a Critic network based on the state correlation feature matrix, and outputting an equalization current value, a constant current or constant voltage equalization mode and an equalization time through the Actor network; according to the equalization current value, equalization mode and equalization time, controlling the DC-DC converter in the main equalization circuit to generate a constant current output, or controlling the Buck-Boost converter in the secondary equalization circuit to generate a constant voltage output. The present invention reduces energy loss while ensuring the equalization efficiency of the power battery pack, and realizes temperature adaptive control of the equalization circuit.

Load disconnect techniques for boost converters. In an example, a power converter includes a driver circuit, a control circuit, and a comparator circuit. During normal boost operation (VIN<VOUT), the comparator circuit disables the control circuit and enables the driver circuit, which in turn fully turns on a high-side switching element during high-side on-phase. In contrast, during start-up operation or an output short-to-ground condition (VIN≥VOUT), the comparator circuit disables the driver circuit and enables the control circuit, which in turn controls the gate voltage of the high-side switching element, so the current through the switching element is regulated, and the switching node voltage is regulated to about a threshold voltage higher than VIN. In this manner, the comparator circuit controls the driver circuit and the control circuit, which in turn allow the boost converter to operate in a normal fashion even when VIN is higher than VOUT.

The invention discloses a hybrid energy storage system applied to independent photovoltaic power generation. The hybrid energy storage system comprises a photovoltaic array, a load, a lithium battery and a super capacitor. The photovoltaic array is connected with the DC bus through the boost converter. The lithium battery is connected with the direct current bus through a DC / DC bidirectional converter; the super capacitor is connected with the direct current bus through the other DC / DC bidirectional converter; due to the influence of the temperature on the lithium battery, the application of the hybrid energy storage system with the lithium battery is limited, the normal operation of the lithium battery can be influenced by over-high temperature, and the stability and the safety performance of the whole independent photovoltaic power generation system can also be influenced. Through a power distribution method, when an external environment of a photovoltaic system changes and a load fluctuates, threshold limitation is carried out on charging and discharging power of a lithium battery so as to ensure long-time safe operation of the lithium battery to compensate power imbalance caused by fluctuation, and thus stability of a bus voltage is maintained; energy distribution can be effectively adjusted according to system energy changes, and system stability and safety are maintained.

The disclosure provides a method of operating a system supported by an electric vehicle (EV). The method includes receiving input data from the input. When the input data is indicative of the EV being in a driving status, the method includes executing a first mode of operation causing a high voltage battery supported by the EV to supply power to one or more low voltage loads and to a motor. When the input data is indicative of the EV being connected to an alternating voltage source, the method includes executing a second mode of operation causing the motor and an inverter to behave as a two-phased interleaved PFC circuit. When the input data is indicative of the EV being connected to a direct voltage source, the method includes executing a third mode of operation causing the motor and the inverter to behave as a two-phased interleaved boost converter circuit.

The invention discloses a boost DC-DC converter capable of stably operating in an open loop under a constant power load and a control system of the boost DC-DC converter, and belongs to the technical field of boost converters. The non-dotted terminal of the first coupling inductance coil is connected with the positive electrode of the first diode, the drain electrode of the power switch tube and the positive electrode of the second diode, and one end of the first capacitor is connected with the negative electrode of the first diode and the dotted terminal of the second coupling inductance coil. The negative electrode of the second diode is connected with the non-dotted terminal of the second coupling inductance coil, one end of the second capacitor and one end of the external constant power load, and the negative electrode of the external voltage source is connected with the source electrode of the power switch tube, the other end of the first capacitor, the other end of the second capacitor and the other end of the external constant power load. The converter and the control system thereof can stably operate in an open loop under a constant power load.

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.

Test system (10) for simultaneous testing of several batteries, in particular high-voltage batteries, comprising: a DC voltage intermediate circuit (22), several basic converters (1a-1h) connected to the DC voltage intermediate circuit (22), each of which is switchably connected to a test channel (4a-4h) via a connection line (24a-24h), a boost converter (2a, 2b) connected to the DC voltage intermediate circuit (22) which, during operation of the test system (10), is switchable to different connection lines (24a-24h) to at least one of the test channels (4a-4h) via a boost line (26a, 26b) and one connection node (18a-18h), a control unit (27) for controlling the basic converters (1a-1h) and the boost converter (2a, 2b) according to a desired power transfer; wherein each connection line (24a-24h) comprises a safety-related switch (6a-6h) between test channel (4a-4h) and connection node (18a-18h).