23results about How to "Small ripple" patented technology

The invention provides a high-power high-reliability voltage retainer used for an automobile starting and stopping system. The high-power high-reliability voltage retainer is higher in power and reliability and smaller in size and ripple. The high-power high-reliability voltage retainer comprises a through circuit module (1), a booster circuit module (2), a reversed polarity circuit module (3), a CAN transceiver (4), a CPU (5), a DSP (digital signal processor) (6) and a battery. A battery input port and a battery output port are formed in the through circuit module (1), a battery input port and a battery output port are formed in the booster circuit module (2), and the reversed polarity circuit module (3) is electrically connected with the booster circuit module (2); the CAN transceiver (4), the CPU (5) and the DSP (6) are sequentially and electrically connected; the CPU (5) is electrically connected with the through circuit module (1), and the DSP (6) is electrically connected with the through circuit module (1); the DSP (6) is electrically connected with the booster circuit module (2).

The application relates to the technical field of LED circuit, in particular to a lamp color adjusting circuit with a thyristor light modulation module, which comprises a rectifier circuit, a multi-grade dial code color adjusting circuit, a frequency flash removing circuit, a thyristor current discharge circuit and a constant current light modulation circuit. The rectifier circuit converts an alternating current power supply into a direct current voltage to supply power to a circuit system. The multi-grade dial code color adjusting circuit adjusts the current distribution of LED lamp beads through a dial code switch and a second group of resistors, generates a color adjusting signal, carries out low-pass filtering and dynamic compensation on the color adjusting signal, and outputs a pure control signal to the thyristor current discharge circuit. The thyristor current discharge circuit adjusts a current path according to the control signal to provide a smooth and adaptive power supply for the constant current light modulation circuit. The constant current light modulation circuit realizes constant current output. The design significantly reduces the hardware cost and the complexity of the circuit system, effectively suppresses electromagnetic interference in combination with the low-frequency modulation characteristics of the thyristor, and realizes the balance between light modulation precision and the stability of the circuit system.

The present application belongs to the technical field of power supply and distribution. A parallel three-level inverter modulation method, system, product, medium and equipment are proposed, which equivalent double parallel three-level inverters as a whole five-level inverter, inject zero sequence components to the initial three-phase reference signal to obtain the reference signal, identify the resultant vector through rounding and remainder operation, and then adjust the reference signal according to the sum of the three-phase state of the initial resultant vector to output a five-segment switching sequence, and then decompose the equivalent five-level reference signal into two sets of three-level reference signals, allocate the reference signals by dividing the half-carrier period and compare them with the triangular carrier to obtain a three-level vector sequence combination. The present application realizes the comprehensive optimization of common-mode voltage, zero-sequence circulating current and output current ripple, avoids complex sector judgment and duty cycle calculation, and reduces the implementation complexity and computational burden.

This invention provides a model predictive control method for a six-phase electric drive reconfigurable on-board charging system, belonging to the field of power electronics and electric drive technology. It solves the problems of high current ripple and heavy computational burden on the system. The technical solution includes the following steps: S1: Obtaining the q-axis current setpoint; S2: Obtaining the real-time 0 / 1 axis current setpoint; S3: Acquiring the six-phase current of the six-phase symmetrical permanent magnet synchronous motor; S4: Calculating the predicted current for the next cycle; S5: Selecting the voltage vector for the next cycle; S6: Obtaining the on / off state of the switching transistors in the next cycle; S7: Realizing the operation mode of the six-phase electric drive reconfigurable on-board charging system based on the drive signal of the six-phase inverter. The beneficial effects of this invention are: it can improve the dynamic and steady-state performance of the system while reducing the computational burden and lowering zero-sequence current ripple, and has broad application prospects.

The invention relates to the technical field of power electronics, in particular to a diesel generator test system control method based on a moving average filter, and the method comprises the steps: collecting an output voltage instantaneous value of a diesel generator in real time, and obtaining a voltage sampling sequence; inputting the voltage sampling sequence into a pre-constructed moving average filter; performing moving average processing on the input voltage sampling sequence through a moving average filter to obtain an output signal; generating a current command signal based on an output signal of the moving average filter; and according to the current instruction signal, driving the diesel generator test system to simulate a load with a specific power factor through current closed-loop control, and carrying out load simulation test on the diesel generator. The moving average filter is directly used for generating a current instruction of the test system, and the lag angle of the current instruction is linearly adjusted by adjusting the point number of the filter through the linear phase-frequency characteristic of the filter, so that the accurate and convenient control of the simulation load power factor of the diesel generator test system is realized.

This invention discloses a hybrid model predictive control method and device for a three-level energy storage converter. The method determines candidate voltage vectors based on voltage vector transformation rules; calculates the cost function value of each candidate voltage vector using a cost function; and selects the voltage vector corresponding to the minimum cost function value as the first... k The pre-optimal voltage vector for the first control cycle; based on the first... k The preliminary optimal voltage vector and midpoint voltage of the first control cycle are combined to determine the first control cycle. k The optimal voltage vector in the first control cycle; in the second... k Calculate the control cycle. k -1 and k The duty cycle of the optimal voltage vector is determined; the gate drive signal corresponding to the optimal voltage vector and its duration is applied to the power electronic semiconductor devices of the T-type three-level energy storage converter. This invention combines the advantages of intuitive and simple finite set model predictive control and high current quality of continuous set model predictive control, enabling current ripple attenuation and current quality optimization of the T-type three-level energy storage converter.

This disclosure relates to the technical field of AC power input to DC power output conversion, specifically providing a totem-pole power factor correction circuit, a power supply system, a compressor, and an air conditioning device. The totem-pole power factor correction circuit includes a rectifier module, an inductor module, a capacitor module, a switch module, and a control module. The capacitor module is connected in parallel with the output of the rectifier module. The capacitor module includes a series branch and a parallel branch. The series branch includes a first capacitor and a second capacitor connected in series, and the parallel branch includes at least one third capacitor connected in parallel across the two ends of the series branch. This disclosure, by using a parallel third capacitor, effectively suppresses bus voltage ripple, fundamentally enhancing the stability and reliability of the circuit under dynamic load changes. It solves the industry pain point of DC bus ripple in totem-pole PFC circuits, achieving a balance of "high efficiency, low ripple, and low cost."

The invention relates to an LLC resonant converter controller, a control method and a resonant converter. The LLC resonant converter controller comprises a level shift circuit, a voltage operation circuit, a charge integration circuit, a feedback voltage processing circuit, a comparator and a drive control logic circuit. The level shift circuit receives the resonance current sampling signal and outputs a second voltage signal and a third voltage signal; the voltage operation circuit receives the second voltage signal, the third voltage signal and an input voltage sampling signal, and outputs a fifth voltage signal and a sixth voltage signal; the charge integration circuit receives the fifth voltage signal and the sixth voltage signal and outputs a slope voltage signal; the comparator compares the ramp voltage with the feedback voltage and outputs a logic control signal; and the driving control logic circuit controls the on-off of a switching tube in the resonant converter. According to the scheme provided by the invention, the overload protection points of the resonant converter can be basically kept consistent under different input voltage conditions, the bias voltage is corrected and adjusted in real time, and the driving pulse width tends to be consistent.

The application relates to the field of food technology, in particular to a plasma intelligent ignition control cabinet, which comprises at least one AC / DC rectifying module for converting alternating current into high-voltage direct current, the AC / DC rectifying module comprises an active power factor correction circuit and a resonant isolation type DC / DC conversion circuit connected in sequence, the active power factor correction circuit is used for performing power factor correction on input alternating current and generating intermediate direct current, and the resonant isolation type DC / DC conversion circuit is used for converting the intermediate direct current into stable high-voltage direct current; by adopting a two-stage high-frequency conversion architecture of 'active power factor correction + resonant isolation type DC / DC conversion', the traditional power frequency phase control rectification is replaced, and the output direct current ripple is fundamentally reduced. In particular, the application of the resonant conversion circuit realizes soft switching of a power switch tube, and greatly reduces switching noise and output ripple.

This utility model provides a three-phase interleaved LLC circuit and power electronic device, belonging to the field of power electronics technology. The three-phase interleaved LLC circuit includes: a primary unit, an A-phase resonant transformer, a B-phase resonant transformer, a C-phase resonant transformer, and at least two rectifier units. The A-phase, B-phase, and C-phase resonant transformers all have the same number of secondary windings, and at least two, corresponding one-to-one with each rectifier unit. Part of the secondary windings of each resonant transformer are connected to the rectifier units via terminals of the same name, while other terminals are connected via terminals of different names, effectively reducing output ripple and simplifying wiring.

The invention relates to the technical field of integrated circuits, in particular to a thermoelectric management system and method based on mixed zero-current detection and an emergency mode, and the system comprises a data collection module which is used for sampling the open-circuit voltage of a transducer to obtain the maximum power point voltage of the transducer; the enable signal generation module is used for comparing a real-time input voltage with the maximum power point voltage, comparing an output voltage with a corresponding reference voltage through a hysteresis comparator, and generating an input end enable signal and an output end enable signal; the data analysis module is used for processing the input end enable signal and the output end enable signal to obtain the switching period and the conduction time of the power switch tube; the heat energy storage module is used for storing thermoelectric energy into the inductor, and the hybrid zero current detection module is used for transferring energy of the energy storage capacitor to the inductor; and the power supply regulator module is used for controlling the conduction condition of the power switch tube according to the demand energy priority of the output voltage.

The application is suitable for the technical field of switching power converter, and provides a negative voltage charge pump circuit and a switching power converter. The negative voltage charge pump circuit adds a clock modulation module, a reference voltage generation module, a comparison module, a fourth driving module, a fifth power tube, a sixth power tube and a seventh power tube on the existing charge pump. When the negative voltage charge pump circuit enters a light load working condition, the large-size power tube and its driving module are closed, only the small-size power tube is kept working, and the small-size power tube automatically judges whether to work according to the absolute value of the output voltage, so that the working current of the negative voltage charge pump circuit is greatly reduced, and the conversion efficiency of the negative voltage charge pump circuit in the light load is improved. At the same time, the pulse width modulation processing is carried out by means of the narrow pulse modulation unit in the clock modulation module, the clock signal for driving the small-size power tube is optimized, and the circuit power consumption in the light load is further reduced.

The application discloses a double-tube flyback switching power supply, and relates to the technical field of switching power supplies, which comprises an input rectification filter circuit, a main control circuit, a switching tube circuit, a flyback transformer circuit and an output rectification filter circuit which are sequentially connected, and a feedback circuit is further connected between the flyback transformer circuit and the main control circuit; the switching tube circuit comprises a transistor Q1 and a transistor Q2; the transistor Q1 and the transistor Q2 constitute a double-tube flyback circuit, and both the transistor Q1 and the transistor Q2 are SiC MOSFETs; the output rectification filter circuit comprises a transistor Q3 and a synchronous rectification control chip U3; the transistor Q3 is a SiC MOSFET; and the synchronous rectification control chip U3 adopts a synchronous rectification circuit structure to rectify the power supply output by the flyback transformer. The application adopts the high-temperature-resistant SiC MOSFET switching device and the double-tube flyback structure, improves the power supply efficiency and reliability under the premise of taking into account the high-temperature-resistant performance.

The invention discloses a power-on modulation circuit, a voltage conversion circuit and electronic equipment. The power-on modulation circuit comprises an offset introduction module, a comparison module and a modulation signal generation module, and the offset introduction module receives soft start control voltage and introduces offset voltage to adjust the soft start control voltage; the comparison module is used for comparing the adjusted soft start control voltage with the feedback voltage to obtain a first control signal; the modulation signal generation module is used for generating a modulation signal based on the first control signal and the clock signal so as to modulate the charging frequency in the power-on process of the voltage conversion circuit. According to the power-on modulation circuit, the feedback voltage of the elevator conversion circuit can better follow the soft start control voltage, and then output voltage ripples in the power-on process are reduced.

The application relates to a linear voltage stabilizer, which comprises a stabilizer input end, a stabilizer output end, a voltage stabilizing circuit and a low-resistance circuit. The stabilizer input end is used for connecting a voltage, the voltage stabilizing circuit is connected with the stabilizer input end and the low-resistance circuit, the low-resistance circuit is connected with the stabilizer output end, and the low-resistance circuit is used for reducing the output resistance of the linear voltage stabilizer. The output voltage is stabilized through the voltage stabilizing circuit, the output resistance is reduced through the low-resistance circuit, the output voltage ripple is reduced, and the purpose of improving the stability of the circuit can be achieved.

A novel tapless resonant push-pull photovoltaic energy storage inverter topology is disclosed, relating to the field of energy storage system topology control technology, specifically a novel tapless resonant push-pull photovoltaic energy storage inverter topology. It includes a photovoltaic boost MPPT circuit, a DC-AC bidirectional inverter circuit, and a battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit. The photovoltaic boost MPPT circuit is used to increase the DC voltage of the photovoltaic panels and perform maximum power point tracking control. The DC-AC bidirectional inverter circuit performs bidirectional DC-to-AC conversion through three independent T-type three-level circuits, each independently controlled, with low harmonic output current. The battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit includes a tapless transformer and a push-pull circuit. Through innovative tapless resonant push-pull circuit, dual-transformer interleaved control technology, and three-level inverter circuit design, it achieves efficient power conversion, optimized battery charge and discharge management, and reduced high-frequency ripple and electromagnetic interference, thereby improving the overall efficiency, stability, and reliability of the photovoltaic energy storage system.

The invention discloses an isolated high-gain resonant and non-resonant soft switching hybrid conversion circuit, which comprises a low-voltage side module consisting of a low-voltage power supply, two inductors and two switching tubes; the soft switching module consists of an inductor, two capacitors and two switching tubes; the isolation module is composed of a transformer; the high-voltage side module is composed of two capacitors, two diodes and a resistor. The hybrid conversion circuit of the isolated high-gain resonant soft switch and the isolated high-gain resonant soft switch have the advantages of the resonant soft switch and the advantages of the non-resonant soft switch, namely, the hybrid conversion circuit has the advantages of excellent efficiency in a full load range and a wide voltage range, remarkable improvement of switching frequency and power density, good electromagnetic interference characteristic and high adaptability to element parameter change; the method is very suitable for high-end power electronic application occasions of new energy automobiles, data centers, renewable energy sources and the like which are wide in input and output range and have strict requirements on efficiency and power density.

The invention relates to the technical field of plant illumination, and discloses a plant growth full-spectrum LED intelligent driving and dimming system which comprises a full-spectrum LED array module, a driving module, a control module, a sensing module and a feedback regulation and control module. The full-spectrum LED array module comprises five kinds of LED lamp beads and covers the ultraviolet A wave band and the spectral ranges of blue light, red light, far-red light and white light. And the driving module adopts a two-stage structure of a front-stage active PFC circuit and a rear-stage half-bridge LLC resonant converter. According to the plant growth full-spectrum LED intelligent driving and dimming system, a full-spectrum LED array module is optimized through an MATLAB exhaustion method to complete non-uniform layout, an illuminance sensor of a sensing module collects illumination data in a 100 ms period, a feedback regulation and control module calls a light uniformizing control algorithm to be combined with a Lambert formula and an improved Portrait equation to establish a precise mathematical model, and the precise mathematical model is used for driving the full-spectrum LED array module to conduct dimming on the full-spectrum LED array module. The double-closed-loop inner ring adjusts the PWM duty ratio of each LED branch in real time according to the PWM duty ratio, rapidly compensates illumination difference, and thoroughly solves the problem that the center is bright and the periphery is dark.

The invention discloses a dynamic hysteresis control method and system for hybrid modulation of a DAB converter, and relates to the technical field of power electronic conversion. The method comprises the following steps: acquiring operation parameters of the DAB converter in real time; wherein the operation parameters comprise transmission power, input voltage and output voltage; determining a theoretical modulation mode corresponding to the current transmission power value according to the operation parameters, and judging whether a boundary condition of mode switching is met or not according to the consistency of the theoretical modulation mode and the current modulation mode and the size relationship between the transmission power difference value in the two modulation modes and the current hysteresis bandwidth; when the boundary condition is met, switching counting is triggered, the number of continuous switching times is recorded, and when the number of continuous switching times reaches a preset threshold value, the hysteresis bandwidth coefficient is updated. By dynamically adjusting the hysteresis bandwidth coefficient, frequent mode switching is suppressed, balance of system response performance is guaranteed, and system stability and operation efficiency are improved.

The invention provides a power supply module and a manufacturing method thereof and a power supply system.The power supply module comprises a coupling inductor and a substrate stacked below the coupling inductor, the coupling inductor comprises a framework type magnetic core structure, a first winding and a second winding, and the first winding and the second winding are wound on the framework type magnetic core structure; the framework type magnetic core structure, the first winding and the second winding are packaged by the magnetic packaging body, and a bare chip is at least packaged in the substrate; wherein the coupling inductor is electrically connected with a pin corresponding to the bare chip in the power supply module. The first winding and the second winding are wound on a framework type magnetic core structure, the framework type magnetic core structure has a manufacturing effect on the first winding and the second winding, and when a magnetic packaging body wrapping the framework type magnetic core structure and the outer sides of the first winding and the second winding is pressed, the first winding and the second winding are wound on the framework type magnetic core structure. The first winding and the second winding can be effectively prevented from being pressed and deformed, so that the manufacturing stability of the power supply module is improved.

The invention belongs to the technical field of laser driving, and relates to a laser driving system with optical waveform feedback. The system comprises a driving circuit, an optical feedback circuit and a control system, the driving circuit is a multi-phase interleaved BUCK circuit and is used for providing large-current and low-ripple driving pulse current for the laser; the optical feedback circuit comprises a photoelectric detector, a trans-impedance amplifier and a fully differential amplifier, and is used for collecting a laser signal output by the laser and converting the laser signal into an electric feedback signal; the control system comprises an FPGA, a high-speed ADC and an upper computer. The FPGA comprises a waveform processing unit, a DDS (Direct Digital Synthesizer) module, a digital integrator and a SerDes module; and the FPGA realizes laser waveform high-fidelity driving and stable output power control through double closed-loop control. According to the invention, a waveform feedback technology is adopted, high-fidelity driving of a laser output waveform is realized, and the stability of output power can still be maintained after waveform adjustment.

This application provides a step-down circuit, chip, and electronic device. By setting a light load detection module, which is used to compare the load current with a preset threshold current, a valid detection signal is generated when the load current is less than the preset threshold current. This allows the current detection unit to increase the on-resistance of the current detection unit according to the valid detection signal, which is equivalent to the load current increasing, thereby reducing the ripple of the step-down circuit under light load conditions.

The invention discloses an interleaved parallel voltage-stabilizing wireless charging system, which belongs to the field of wireless charging and comprises a primary side and a secondary side. The primary side comprises a direct-current power supply VIN, an inverter circuit and a primary side compensation and transmitting coil and is used for transmitting energy to the secondary side; and the secondary side comprises a receiving coil, a secondary side compensation circuit, a rectification circuit and two voltage stabilizing circuits which are connected in parallel in an interleaving manner, and is used for receiving the energy of the primary side and adjusting the output power. The system does not depend on primary side power adjustment, control over the output power is achieved only through the secondary side voltage stabilizing circuit, a communication system between the primary side and the secondary side is not needed, communication delay does not exist, and the structure is simple. According to the system, through the current sharing design, the two voltage stabilizing circuits connected in parallel are used for shunting output current, and the current stress of a switching tube is reduced. In addition, through phase control between the two voltage stabilizing circuits, output voltage and output current ripples can be reduced, and then the requirement for output capacitance is reduced.