354 results about "Buck converter" patented technology

The invention discloses a low-output-ripple automatic-current-sharing interleaving buck converter and a control method thereof.The converter comprises a main power circuit and an auxiliary compensation circuit, and the main power circuit adopts two interleaving main branches to achieve voltage conversion and energy transmission; automatic current sharing of the circuit is realized through the integrated network switch module and PWM signal control; the auxiliary compensation circuit adopts a current mirror image compensation principle, and adjusts the magnitude of the compensation current by comparing the difference between the output current of the main power circuit and the reference current, so as to effectively suppress the output current ripple; the control method comprises the steps of output voltage monitoring, PI adjustment, duty ratio modulation and a complementary control mechanism, current ripple phase offset is ensured, and the system stability and efficiency are improved. Compared with the prior art, the method has the advantages that the complexity of a control system is reduced, the working efficiency is improved, the current ripples are effectively eliminated, and the method has relatively high practical value and popularization prospect.

A buck converter including a high-side switch, a low-side switch and a bootstrap (BOOT), under-voltage lockout (UVLO) circuit. The BOOT UVLO circuit includes a BOOT UVLO detection element configured to compare a BOOT voltage with a switch node (SW) voltage to determine an occurrence of a BOOT UVLO event. The BOOT UVLO detection element is configured to output an UVLO signal (UVLO_Z), in case of the BOOT UVLO event. The BOOT UVLO circuit further includes a logic gate configured to receive the UVLO_Z and a high-side ON, (HSON) signal, the HSON signal is for controlling a switching of the high-side switch. The logic gate is configured to negate the HSON signal when receiving the UVLO_Z while the HSON signal is ON, to thereby immediately switch OFF the high-side switch when the HSON signal is ON.

The invention relates to a transient enhanced multi-phase Buck converter and a control method thereof, and the method comprises the steps: continuously monitoring and outputting a voltage reduction signal through a capacitance current sampling module, calculating a to-be-judged voltage signal, and outputting a high-level judgment signal when the to-be-judged voltage signal is greater than a reference voltage VTH1; after receiving the signal, the phase control module forcibly outputs logic control signals which are all high levels to the self-adaptive conduction time generation module; the multi-phase current conversion module synchronously conducts all single-phase Buck conversion circuits in the multi-phase current conversion module accordingly, so that the single-phase Buck conversion circuits simultaneously work to output the maximum current, and severe fluctuation of the output voltage is rapidly inhibited; and when the full-phase forced working mode is maintained until the voltage signal to be judged corresponding to the new voltage reduction signal is smaller than the reference voltage VTH2 again, the transient is relieved, and the system is automatically switched back to the conventional minimum current phase interleaving control mode. According to the scheme, the problem of response lag of a traditional multi-phase Buck under extreme load transient can be effectively solved.

The invention provides a DC Buck converter voltage and current sensor fault-tolerant control system, which comprises the following steps: establishing a time-varying state space model of a DC Buck converter, and dynamically reconstructing a parameter matrix by the time-varying state space model according to the real-time change of a duty ratio; the time-varying augmentation fault estimator is used for monitoring faults of a voltage sensor and a current sensor in real time, the fault estimator is implemented through a model reference adaptive filter, a Buck converter is adopted to construct a reference model in a healthy state, and efficient real-time diagnosis and correction can be achieved through the faults of the voltage sensor and the current sensor of the Buck converter. And various types of sensor faults such as a jump fault, an offset fault, a stuck fault, a high-frequency fault and a gap fault can be effectively estimated. For measurement distortion of the voltage sensor and the current sensor, the fault estimator can provide comprehensive evaluation information of fault types and fault severity.

The invention discloses a multi-level pulse compensation type active EMI (Electro-Magnetic Interference) filter suitable for a multi-noise source switching power supply and a control method of the multi-level pulse compensation type active EMI filter. The invention provides a multi-level pulse compensation scheme based on switch behavior modeling, aiming at the problem of common-mode noise of adjacent rising edges and falling edges generated by a high-frequency switch in a multi-noise-source switching power supply. The time sequence delay and the edge slope of the compensation signal are calculated by analyzing the dv / dt characteristics in the switching-on and switching-off processes of the switching device, and accurate matching and offset with a noise source in phase and amplitude are achieved. Compensation control logic is realized by sharing a main control chip with a power circuit, and an additional controller and a high-precision sampling system are not needed; the self-adaptive tracking of the compensation amplitude is realized through the voltage following circuit; a multi-level compensation signal is output through the totem-pole circuit and injected into a common-mode path, and effective suppression of electromagnetic interference is achieved. The converter has the advantages of small size, low cost, simplicity and convenience in installation, high stability and the like, and is suitable for various multi-noise-source power electronic systems including a dual-active bridge converter, a phase-shifted full-bridge converter and an interleaving Buck converter.

The invention relates to the technical field of power electronics, and discloses a single-stage bidirectional DC / AC converter and a control method thereof. The single-stage bidirectional DC / AC converter comprises a pre-stage circuit and a post-stage circuit which are multiplexed by a switching tube. Wherein the pre-stage circuit is an L-LLC resonant converter or a CLLC resonant converter, and the post-stage circuit is an interleaved Buck converter. And an output inverter bridge at the secondary side of the transformer is replaced by a bridgeless structure. According to the single-stage bidirectional DC / AC converter, the number of switching tubes is reduced through a multiplexing technology, the topological structure can be simplified, the stability is improved by reducing the damage probability, and the cost is reduced; furthermore, by utilizing a soft switching technology of a pre-stage circuit, ZVS of four primary-side switching tubes and half secondary-side switching tubes can be realized, the switching loss is greatly reduced, and the working efficiency is improved; an output inverter bridge is omitted, the number of switching tubes can be further reduced, and the power density and the working efficiency are improved.

The invention discloses a multiphase BUCK converter and a high-dynamic self-adaptive phase cutting method. The multiphase BUCK converter comprises a 16-phase power level, a current sampling module, an MOS driving module, a digital control module, a CMCOT simulation main control loop and a dynamic detection circuit. The MOS driving module controls a switching tube in the 16-phase power level, the current sampling module collects an inductive current signal, the input end of the CMCOT simulation main control loop is connected with the output end of the current sampling module, and a PWM control signal is output to the digital control module; the input end of the dynamic detection circuit is connected with an output signal of a voltage loop gain in the CMCOT analog main control loop, and a mark signal is generated and output to the digital control module; the digital control module generates a phase cutting signal. A phase cutting strategy is correspondingly provided, the number of PWM started by a phase cutting signal is adaptively changed, the transient voltage undershoot is reduced, meanwhile, voltage overregulation is avoided, and the transient performance is remarkably improved.

The invention discloses an adaptive mode switching circuit of a BUCK converter for COT control. The adaptive mode switching circuit comprises a conduction time generation circuit, an OR gate, phase inverters INV1, INV2 and INV3, an NAND gate, an AND gate, RS triggers RS1 and RS2, transistors Mon, MN1, MN2 and MN3, a falling edge delay circuit, a rising edge delay circuit and a zero cross detection circuit. According to the invention, a conduction signal and a zero-cross detection signal are fed back to the conduction time generation circuit, the states of two paths of control signals in a DCM mode and a CCM mode are adaptively adjusted, logic operation is carried out on the control signals through an OR gate, and the conduction time of an upper tube is adaptively adjusted. When the DCM mode is switched to the CCM mode, the CCM control signal serves as a conduction time control signal, and the conduction time of an upper tube is increased; and when the CCM mode is switched to the DCM mode, the DCM control signal is used as a conduction time control signal, and the conduction time of the upper tube is reduced.

An automatic current sharing control method for an interleaved BUCK converter belongs to the technical field of power electronics, and comprises the following steps: step S1, obtaining an output voltage and a given output voltage of a load end of the interleaved BUCK converter; obtaining the current of each phase of inductor; s2, obtaining an average value of the inductive current of each phase, and averaging the average value of the inductive current of each phase as a reference value of a current loop; s3, calculating a duty ratio signal through a current loop; s4, calculating a duty ratio signal through a voltage loop; and S5, superposing the duty ratio signal of the current loop operation of each phase with the duty ratio signal of the voltage loop operation. According to the invention, the inductive current of each phase follows the average inductive current of three phases in real time, high-precision current-sharing control is realized, and the control reliability is improved, so that the output current is controlled at an average level.

The invention discloses a gallium nitride hybrid switched capacitor voltage converter with a high step-down ratio, which belongs to the technical field of switching power supplies and comprises an input filtering module, a switched capacitor module group, a half-bridge module group and an output filtering module which are connected in sequence, the switched capacitor module group comprises a plurality of switched capacitor modules which are connected in parallel, the half-bridge module group comprises a plurality of half-bridge modules which are connected in parallel, and the switched capacitor modules and the half-bridge modules are in one-to-one correspondence and work in corresponding preset switching periods; the output filtering module comprises a plurality of output filtering inductors, and the output filtering inductors are correspondingly connected with the half-bridge modules. Through innovation of the topological structure, the buck ratio higher than that of a traditional Buck converter under the same duty ratio is achieved, input current and output voltage ripples are further improved through a multi-phase interleaving parallel control mode, wide bandgap devices are reasonably selected for the innovatively-designed topological structure, and therefore the output current and output voltage ripples are improved. And the circuit is more suitable for kilowatt-level switching power supply equipment.

The invention discloses a multiphase dynamic scheduling adaptive conduction time control Buck converter based on phase interpolation. The converter comprises a self-adaptive turn-on time control module, a phase interpolation control module and a dynamic phase scheduling module, the number of working phases can be dynamically adjusted according to load current changes, a multi-phase clock signal is generated through a phase interpolation method, and high-precision multi-phase current-sharing control is achieved. According to the invention, the output ripple of the system is reduced, the bandwidth and dynamic response performance of the system are improved, the energy efficiency under a light-load working condition is remarkably improved, and the method is suitable for a high-performance chip power supply system.

The invention discloses a DC-DC converter parameter identification method based on digital twinning, and the method comprises the following steps: firstly building a Buck converter simulation model, collecting needed data from the simulation model, building a mathematical model according to a Buck converter circuit structure, KCL and KVL, and carrying out the calculation of the Buck converter simulation model. And solving a differential equation of the mathematical model by using a Runge-Kutta method to obtain calculation data, substituting the collected simulation data and calculation data into a target function, performing iterative optimization on the target function value by using a Kirchhoff's law optimization algorithm, and outputting an optimal solution of a to-be-identified parameter, namely an identification value of the circuit parameter. According to the method, the parameter identification error of the DC-DC converter can be reduced, and the accuracy is improved.

The invention discloses a method and a device for improving dynamic characteristics of a two-stage resonant converter based on a virtual resistor, and in the converter, a front-stage Buck converter and a rear-stage LLC resonant converter are connected through a common DC bus; the dynamic characteristic improvement method comprises the following steps: inputting bus capacitor voltage on a common direct current bus into an active damping inner ring controller, and simulating a virtual resistor accessed to a converter through output; the difference value between the output voltage of the resonant converter and the reference voltage is input into a voltage outer loop proportional-integral controller; and subtracting the output signals of the active damping controller and the voltage outer loop controller to obtain an improved duty ratio of the preceding-stage Buck converter for controlling a switching device. By adopting the above technical scheme, through a control mode of combining voltage outer loop control and active damping inner loop control, the double-resonance peak in the voltage loop is suppressed, and the bandwidth of the voltage loop is effectively expanded.

The present invention provides a dynamic current-sharing technology based on series capacitor charge balancing and a three-phase series capacitor Buck converter device thereof, belonging to the field of power electronics. This control method ensures that the three-phase series capacitor Buck converter maintains good steady-state accuracy while rapidly responding to sudden changes in load current. This control method simplifies and solves the problem of ensuring that all state variables reach new steady-state values ​​simultaneously at the end of a transient process when implementing charge balancing control in a three-phase series capacitor Buck converter. This control method offers the advantages of a constant switching frequency, independence from converter circuit parameters, zero steady-state error, and rapid load transient response.

The invention discloses a high-speed level shifter applied to a BUCK converter. The high-speed level shifter comprises a level shifting part, a control logic part and an output part, after the level shift part inputs a signal, a low-delay rising edge and a high-delay falling edge of a conversion level A, and a high-delay rising edge and a low-delay falling edge of a conversion level B are output; the input of the control logic part adopts CLK in a BUCK converter to generate a short pulse, a high-voltage domain where SW and BST are located is isolated from a low-voltage domain, when the short pulse is at a high level, an output control signal is high, and when the short pulse is at a low level, the output signal is low; the input of the output part is the output of the level shift part and the control logic, and when the control signal is high, a low-delay rising edge is selected to be output; and when the control signal is low, selecting to output a low-delay falling edge. The level shift result is output through double ports, and low delay of conversion between the rising edge and the falling edge is achieved.

An apparatus includes a second phase PWM off time current sense circuit configured to generate a second phase PWM off time current signal proportional to a current flowing through a second inductor when a high-side switch of the second phase is turned off and a low-side switch of the second phase is turned on, a second phase PWM on time current rebuild circuit configured to construct an artificial second phase inductor current signal using a second phase voltage-controlled current source to charge a second rebuild capacitor when the high-side switch of the second phase is turned on, and a second phase feedback loop configured to adjust a current flowing through the second phase voltage-controlled current source so as to force a saved voltage of the artificial second phase inductor current signal to be equal to a saved voltage of the second phase PWM off time current signal.

The invention discloses a high-precision BUCK converter with variable time-constant virtual ripple compensation, and relates to the technical field of circuits, a control logic and driving module drives a high-side and low-side switch group according to a control voltage so as to convert an input voltage into a square wave voltage of a switch node, and forwards the control voltage; the LC filter is used for filtering the square wave voltage and outputting steady-state output voltage; the variable time constant ripple injection circuit generates a fixed ripple voltage by extracting an average voltage value of the square wave voltage, and adjusts the size of a time constant by controlling the voltage to generate an alternating current ripple voltage based on the square wave voltage to generate an alternating current compensation ripple voltage; the feedback resistor group divides the output voltage to generate feedback voltage; and the loop comparator compares a superposed voltage obtained by superposing the alternating current compensation ripple voltage and the feedback voltage with a reference voltage to generate a control voltage, so that the high-precision BUCK converter which is simple in structure, high in dynamic response speed and high in steady-state precision is provided.

The invention discloses a sensorless control method for an electrically excited synchronous motor based on a rotor switching signal, and relates to the technical field of motor control, the inherent high-frequency modulation switching signal of an EESM rotor circuit (in a buck converter form) is utilized, and an effective stage (AS) and an ineffective stage (IAS) are divided based on the unipolarity characteristic of a rotor modulation voltage; a stator current gradient is directly calculated at the AS to extract position information, a fundamental current component is estimated at the IAS to be used for compensation, magnetic coupling saturation compensation and rotor PWM frequency optimization are combined, and full-rotating-speed sensorless control is achieved.

The invention discloses a heat balance phase management system of a multi-phase staggered Buck converter, and relates to the technical field of power electronics. The system comprises a working phase quantization module, a temperature monitoring module, a closed-loop control module and a fault early warning module, the number of effective working phases is dynamically adjusted through real-time monitoring of the inductive current of each phase and the temperature of a switching tube, a phase working enable signal is generated, and PWM signal modulation is achieved in cooperation with closed-loop control. The system can select a phase with lower temperature to be put into operation according to load current and temperature change, so that inter-phase heat balance is realized, the reliability of the system is improved, and the service life of devices is prolonged. Compared with an existing dynamic phase management technology, interphase heat distribution can be effectively optimized, aging of the switch tube is reduced, and system efficiency and long-term stability are improved.

The invention belongs to the technical field of analog integrated circuits, and particularly relates to a high-speed high-dv / dt noise suppression level shift circuit. The circuit is used for the BUCK converter, a trigger is used for inputting a logic signal to provide a stable dv / dt noise elimination path, and the reliability of a device is improved; the auxiliary recovery circuit is used for ensuring accurate and rapid establishment of a pull-down current, the pull-down current is multiplexed as a dv / dt noise supplement transient enhancement circuit, in addition, even if the dv / dt noise is large, the S of the SR trigger generates a false trigger pulse, at the moment, the R-end pulse of the trigger covers the false trigger pulse, and the accuracy of transmission logic under high noise is ensured. According to the level shift circuit, the reliability of a device and the correctness of logic transmission under a high-noise condition are ensured.

The invention relates to a DC-DC converter control method based on an intelligent agent reinforcement learning algorithm, and the method comprises the steps: firstly building an intelligent agent for a DC-DC buck converter which supplies power to a constant-power load, obtaining a state observation quantity formed by all preset environment variable values of the DC-DC buck converter through the intelligent agent, and obtaining the state observation quantity of the DC-DC buck converter; and a reward value corresponding to a difference value between the output voltage and a preset reference voltage is processed by the intelligent agent, and a corresponding action signal is output and used for controlling the DC-DC buck converter. And then through reinforcement learning training of the intelligent agent, the trained model controls the DC-DC buck converter, so that the output voltage of the DC-DC buck converter has good adaptivity and dynamic response characteristics under different working conditions, and the designed intelligent agent has good steady-state performance in application, so that the stability of the DC-DC buck converter is improved. Model parameter uncertainty caused by component aging can be dealt with, and the stability in practical application is ensured.

The invention provides a compensating circuit of a high-switching-frequency Buck converter and application of the compensating circuit, and belongs to the technical field of Buck converters. According to the compensating circuit, a high gain branch and a low gain branch are designed, wherein the branch including a first transconductance operational amplifier OTA1 has the characteristics of low gain and high bandwidth; the branches including the second transconductance operational amplifier OTA2 have the characteristics of high gain and low bandwidth, and the two branches are provided with corresponding active devices. A feedback voltage signal carrying switching noise is mainly introduced into a subsequent loop through two paths, the first loop passes through the first transconductance operational amplifier OTA1, the high-frequency gain of the path is extremely low, and the high-frequency gain of the switching noise can be effectively suppressed; and the second path passes through an advanced compensation module PD, a second transconductance operational amplifier OTA2 and a divider DIV to form current to charge a second capacitor C2, but the capacitor has an integral effect, so that the high-frequency gain of switching noise is effectively reduced. Compared with traditional three-type compensation, the method has higher noise suppression capability.

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.

The present specification relates to the technical field of power electronics, and particularly relates to a multi-element heterogeneous hydrogen production power supply and a control method. The power supply comprises a main branch and an auxiliary branch. The main branch comprises a first rectifier circuit and a Buck converter. An input end of the first rectifier circuit is connected with a first output winding of a transformer, an output end of the first rectifier circuit is connected with an input end of the Buck converter, and an output end of the Buck converter is connected with a first end of a DC bus. The main branch is used for providing steady-state power. The first rectifier circuit is an uncontrolled rectifier circuit. The auxiliary branch comprises a second rectifier circuit and a full-bridge circuit. An input end of the second rectifier circuit is connected with a second output winding of the transformer, an output end of the second rectifier circuit is connected with an input end of the full-bridge circuit, and an output end of the full-bridge circuit is connected with the first end of the DC bus. The auxiliary branch is used for transmitting fluctuating power or AC excitation. The embodiments of the present specification can balance between steady-state high efficiency and dynamic fast response.

The invention relates to the technical field of buck-boost converters, and discloses a phase control circuit and method, and a buck-boost system. According to the phase control circuit provided by the embodiment of the invention, the edge change rate of the phase-cut inductive current is slowed down by processing the phase-cut signal, so that when the double-phase reverse buck-boost converter performs phase cutting based on the phase-cut signal, one single-phase buck-boost converter can enter or exit softly, and the other single-phase buck-boost converter can enter or exit softly. Therefore, the ripple of the load voltage signal at the output end of the dual-phase reverse buck-boost converter is ensured to meet the design requirement, and the load connected with the dual-phase reverse buck-boost converter is prevented from working abnormally.

This invention discloses a control method, device, and system for suppressing current ripple in a coreless brushed DC motor, belonging to the field of DC motor control. The method includes: using an H-bridge Buck converter as the driving topology to provide smooth voltage; designing a state feedback controller based on its state-space model to adjust the dynamic current response; simultaneously designing nonlinear disturbance observers to compensate for matched disturbances in the inductor branch and unmatched disturbances and their derivatives in the capacitor branch; innovatively designing a multi-channel quasi-resonant proportional-integral resonant observer to observe and compensate for the unmatched periodic disturbances caused by motor component commutation, with higher precision; and finally synthesizing a composite control law to drive the motor. The device and system correspondingly implement the above method. Compared with higher-order disturbance observers, the multi-channel quasi-resonant proportional-integral resonant observer proposed in this invention significantly improves the compensation capability for unmatched periodic disturbances, effectively suppressing current ripple in the coreless motor and improving torque stability.

The application discloses a kind of Buck converter operating state online detection methods under CCM mode, parallel a known capacity capacitor at the output of Buck converter, collect the output voltage ripple before parallel capacitor and the output voltage ripple after parallel capacitor, then combine the average value of output voltage, the parameter of output filter capacitor can be calculated, and the performance of switching power supply will not be affected by parallel capacitor;Without additional excitation auxiliary measurement, without disassembling power supply, the operating state of Buck converter can be detected online, and Buck converter is not impacted in any way;In the long-term operation process of Buck converter, the working state and aging condition of Buck converter can be judged according to the parameter of capacitor, to achieve the purpose of Buck converter fault detection.

The invention discloses a quasi-single-stage micro inverter and electronic equipment, the quasi-single-stage micro inverter comprises a boost converter circuit and a buck converter circuit, the boost converter circuit is coupled with the buck converter circuit, one of the boost converter circuit and the buck converter circuit is coupled with a power grid end, and the other of the boost converter circuit and the buck converter circuit is coupled with a power grid end. The other one of the boost converter circuit and the buck converter circuit is coupled with the direct current end; wherein when the absolute value of the power grid voltage is smaller than the mode switching voltage, the buck converter circuit is controlled to carry out buck work, and the boost converter circuit is controlled to work in the optimal efficiency working condition; the absolute value of the power grid voltage is greater than the mode switching voltage; if yes, controlling the boost converter circuit to perform boost work and controlling the buck converter circuit to work in the optimal efficiency working condition. By means of the mode, the quasi-single-stage micro inverter is higher in efficiency and easy to control, and circuit parameters are convenient to optimize.

A method (100) for determining optimized operating point control parameters for controlling an inductive transformer (1) with a buck converter (12) and bridge circuit (13) for driving a rotor (40) of a separately excited electrical machine is disclosed, comprising: acquiring transmission powers (110) of the inductive transformer (1); acquiring temperatures (110) of a transformer (30) of the inductive transformer (1); acquiring cooling temperatures (110) of at least one power semiconductor element of the buck converter (12) and / or at least one power semiconductor element of the bridge circuit (13); acquiring primary DC link voltages (110) of the inductive transformer (1); determining an operating characteristic map (120) of the inductive transformer using the transmission power, the temperatures, the cooling temperatures and the primary DC link voltages;Determining a minimum operating point control parameter and a maximum operating point control parameter (130) using the operating characteristic map corresponding to an operating point to provide a required transmission power of the inductive transformer (1); determining a total power loss (140) of the inductive transformer (1) using the operating characteristic map corresponding to the operating point; and determining the optimized operating point control parameter (150) for the operating point at which the total power loss is minimized, using the minimum operating point control parameter and the maximum operating point control parameter.

The present invention discloses a four-switch buck-boost converter topology circuit and its control method. To solve the problem of insufficient freewheeling circuits, the order of two bridge arms is adjusted and the inductor is split. The Boost bridge arm and the Buck bridge arm each have an independent freewheeling inductor. Additionally, through the combination of an inductor and a unidirectional diode, a unidirectional freewheeling branch is connected in parallel at the upper switch terminal of the Boost bridge arm, which can ensure that all switch tubes have a reliable freewheeling circuit. This not only solves the soft-switching problem but also independently sets filter circuits for the front and rear bridge arms, which can effectively reduce the electromagnetic interference generated during the operation of the circuit and also enhance the anti-disturbance ability of the circuit itself, solving the technical problems that the four-switch buck-boost circuit cannot provide a reliable freewheeling circuit for all switch tubes and has poor stability.