15results about How to "Reduce peak current" patented technology

The invention provides a PSR flyback conversion circuit, a constant current control method and a power system.The circuit comprises a primary winding circuit, a secondary winding circuit and an auxiliary winding circuit, and the auxiliary winding circuit is a voltage sensing loop used for PSR; the switch tube control unit of the primary winding circuit is configured as follows: when the voltage of the second end of the power switch tube of the primary winding circuit is greater than or equal to a constant current reference voltage, the circuit enters a constant current output mode; and when the circuit enters the constant current output mode, at least setting an excitation reset time ratio based on a first voltage value sensed by the auxiliary winding circuit, the set excitation reset time ratio being greater than or equal to 0.5. Therefore, when the input voltage is far larger than the output reflection voltage N * Vo, it is guaranteed that the secondary winding circuit can output the correspondingly set constant current, the primary and secondary RMS current of the PSR flyback conversion circuit is reduced by increasing the excitation reset time ratio, and then the conduction loss is reduced, and the efficiency is improved.

The embodiment of the invention discloses a power supply device and a charging method and system. The power supply device comprises a rectification module used for rectifying an AC voltage to obtain a first pulsating DC voltage; the conversion module is used for converting the first pulsating direct-current voltage to obtain stable direct-current voltage; the valley filling circuit is respectively connected with the rectification module and the conversion module, and is used for boosting the first pulsating direct-current voltage output by the rectification module when the voltage value of the first pulsating direct-current voltage is greater than a first voltage threshold value, and storing energy based on the boosted first pulsating direct-current voltage; and when the voltage value of the first pulsating direct-current voltage is smaller than a second voltage threshold value, electric energy is provided for the conversion module, so that the trough voltage of the first pulsating direct-current voltage input to the conversion module is increased. According to the power supply device, the charging method and the charging system, the size of the power supply device can be reduced, and the stability of the output voltage of the power supply device is ensured.

The utility model discloses an optimized control circuit for MR permanent magnet heating, which comprises two paths of heating tape control circuits for MR permanent magnet heating, each heating tape control circuit comprises a heating tape, a temperature controller and a relay connected with the heating tape, the input end of the temperature controller is connected with the temperature sensor on the heating belt, the output end of the temperature controller is connected with the relay through a control line, and in one heating belt control circuit, a time delay relay is arranged on the control line where the temperature controller is connected with the relay and used for starting heating of the heating belt in a time delay mode in the initial power-on state. Through the mode, the peak current during starting is effectively reduced, the subsequent heating efficiency is not influenced, the system safety problem that a fuse is burnt out due to overlarge starting peak current and the like is solved, and the circuit has the advantages that the circuit is simple, the reliability is high, the subsequent heating efficiency is not influenced after starting is completed, and the like.

The invention discloses a resonant dual-active bridge converter and a control method, and the converter comprises a primary full-bridge circuit, a secondary full-bridge or half-bridge circuit, a transformer, and an LC resonant network composed of a resonant inductor and a resonant capacitor which are connected in series. The control method comprises the following steps: acquiring parameters of an input voltage V1, an output voltage V2, a transmission power P, a transformer turn ratio N, a resonant inductance Lm and a resonant capacitance Cr of the converter; and calculating a primary fundamental wave equivalent voltage and a secondary fundamental wave equivalent voltage, and calculating an inner phase shift angle alpha between a first bridge arm and a second bridge arm in the primary full-bridge circuit through the primary fundamental wave equivalent voltage and the secondary fundamental wave equivalent voltage. The LLC converter has the beneficial effects that the inherent defects that the gain range of a traditional LLC converter is narrow (generally only 0.8-1.2) and the circulating current is sharply increased and the efficiency is sharply reduced when the voltage is seriously mismatched in the traditional phase-shifting DAB are fundamentally overcome.

The application discloses a kind of based on single-stage grid-connected micro-reverse soft switching online real-time monitoring and closed-loop maintenance control method and system, mainly solve the problem of existing zero-voltage opening / non-zero voltage opening boundary difficult to judge and light load zero-crossing region loss soft switch leads to hard opening, its scheme includes: sampling the real-time state variable operated in single-stage grid-connected micro-reverse circuit, based on the sampled photovoltaic side voltage, photovoltaic side current, grid side voltage and grid side phase, respectively calculate internal and external moving phasor;Custom dead time and target level, according to the dead time and the sampled bridge arm commutation current, bridge arm commutation voltage and switching node voltage judge the soft switching state when commutation event k time;Based on the soft switching state, calculate the corrected internal and external moving phasor, output the driving signal of switch tube, to realize the soft switching online real-time monitoring and closed-loop maintenance of single-stage grid-connected micro-reverse.The application can improve the robustness of soft switching implementation, reduce the risk of hard opening, and can be used for soft switching control and energy transmission of single-stage grid-connected micro-reverse.

The utility model provides a power gating circuit and a chip, which belong to the technical field of semiconductor circuits, and comprise a first gating link used for controlling the chip to be pre-electrified; the first gating link comprises a first control signal input end and a plurality of first gating units, power supply pins of the plurality of first gating units are connected in parallel, switching signals of the plurality of first gating units are connected in series, and the switching signals of the first gating units are connected with the first control signal input end; at least one delay unit is connected in series between every two adjacent first gating units, and the delay units are used for controlling the current change rate in the chip power-on process. According to the utility model, the current change rate generated when the first gating unit in the first gating link is opened is reduced through the time delay unit, and the power supply stability of the whole power supply system is improved.

The present invention provides a semiconductor device and a continuous reading method for improving the existing continuous reading. The flash memory of the present invention includes: a NAND type memory cell array, an input-output circuit, an ECC circuit, a controller, a word line selection circuit, a page buffer / reading circuit, and a column selection circuit. When the controller performs continuous reading of a page, the first 1 / 2 page of the selected page is read from the memory cell array, and independently the second 1 / 2 page of the selected page is read from the memory cell array, and the data of the 1 / 2 page read out is continuously outputted in synchronization with a clock signal.

The invention discloses a three-phase three-level ANPC series resonant dual active bridge DC / DC converter, belonging to the field of DC / DC converters, comprising: a control unit, a three-phase transformer, and two three-phase hybrid power device ANPC three-level circuits respectively connected to two sides of the three-phase transformer, a three-phase resonant network is connected between the primary side of the three-phase transformer and the three-phase hybrid power device ANPC three-level circuit connected thereto; the control unit is used to control the on and off of each switch tube in the three-phase hybrid power device ANPC three-level circuit, so that the neutral point level of the three-phase transformer is V dc / 6, 0 or V dc / 6, the voltage at the output of each half-bridge ANPC three-level bridge arm relative to the connection point of the two DC voltage-dividing capacitors is ‑2V dc / 3, ‑V dc / 2, ‑V dc / 3, 0, V dc / 3, V dc / 2 or 2V dc / 3, the resonant tank voltage of each phase is an eleven-level voltage. A three-phase three-level ANPC active bridge is designed in the DC / DC converter, so that the resonant tank voltage waveform is a multi-level voltage step wave that is closer to a sine wave, thereby reducing the reactive loss of the converter and the current stress borne by the switch tube.

The present disclosure provides a power supply circuit and chip. The power supply circuit includes: a power switch, the power switch includes a control end, and the power switch is configured to be controlled to turn on or off the power supply and the load; a drive circuit, the drive circuit is coupled to the control end of the power switch, and the drive circuit is configured to control the potential of the control end of the power switch to control the turning on or off of the power switch; wherein, during the process of the power switch being turned on, the potential establishment rate of the control end of the power switch in the first stage is greater than the potential establishment rate in the second stage, and the first stage is earlier than the second stage. Since the power switch is turned on at a slow rate in the second stage, the peak current when the power switch is turned on is reduced, thereby improving the stability of the power supply circuit. At the same time, since the potential establishment rate of the control end of the power switch is fast in the first stage, the time required for the power switch to be turned on is reduced, thereby improving the reliability of the power supply circuit.

The invention provides a semiconductor device structure and a preparation method thereof. The semiconductor device structure comprises a first conductive type back surface layer, a trench gate and a deep trench field plate, wherein the first conductive type back surface layer is composed of a first conductive type buffer layer and a first conductive type follow current heavily doped region below the deep trench field plate; the trench gate penetrates through a second conductive type body region and extends into a first conductive type substrate layer; and the depth of the trench gate penetrating through the first conductive type heavily doped region is smaller than that of the deep trench field plate. The deep trench field plates in short circuit with the emitter electrode are arranged on the two sides of the trench gate, so that a large number of holes can be accumulated when the deep trench field plates are conducted, and the conduction voltage drop is reduced; meanwhile, the vertical electric field distribution is added into the deep trench field plate to optimize the compromise relation between the FRD breakdown voltage and the break-over voltage in the RC-IGBT, so that the working loss of the RC-IGBT in the follow current state is reduced; besides, carriers in a depletion layer can be rapidly extracted in a follow current state in cooperation with a deep trench field plate, so that the current released during reverse recovery is reduced, and the peak current of reverse recovery is reduced.

The invention discloses a transmission system and a motor starting control method. The transmission system comprises a motor; one end of the speed regulator is connected with the motor, and the other end is disconnected with the load before the motor is started and connected with the load after the motor is started; the control system is used for controlling the operation states of the motor and the speed regulator; before the motor is started, the control system controls the motor to be powered off and controls the speed regulator to be powered on, so that the speed regulator drives the motor to rotate, and when the motor reaches the rated rotating speed, the control system controls the speed regulator to be powered off and simultaneously controls the motor to be powered on. According to the invention, the starting impact can be reduced, the influence on the motor and the power grid is reduced, the current demand during starting is reduced, the capacity of a power grid system is reduced, smooth starting can be realized, the motor is driven to rotate through the speed regulator, the motor generates no-load counter electromotive force, and the motor can be started more stably when electrified; the reliability and the stability of motor starting are improved, and the mechanical stress during motor starting is reduced.

The invention discloses a switched reluctance motor control method based on direct instantaneous torque control, and relates to the field of motor control. The method comprises the following steps of: obtaining a torque difference value delta T according to the difference between a reference torque Tref and an actual torque T, and obtaining the state of a three-phase switch at the moment according to a conduction rule by the numerical value and the change trend of the torque difference value delta T so as to form a voltage vector; when the number of the obtained voltage vector is one, the voltage vector acts on a power converter of the switched reluctance motor in the next control period, when the number of the obtained voltage vector is two, a corresponding predicted torque is calculated according to the voltage vector, the predicted torque is compared with a reference torque, and the predicted torque is calculated according to the reference torque. And judging a vector needing to be acted according to a comparison result, and acting the vector on a power converter of the switched reluctance motor. According to the invention, the single-phase conduction region can be reduced, the torque ripple of the commutation region can also be reduced, and the effect is better under the dynamic condition.

The application discloses a beam-type pumping unit front balance and accident protection device, and relates to the field of pumping units, which comprises a support, a beam, a hydraulic cylinder, a balance energy accumulator and a high-pressure hose, the beam is movably hinged at the top end of the support, one end of the hydraulic cylinder is hingedly connected with the forearm of the beam, the other end of the hydraulic cylinder is hingedly connected with the middle upper part of the support, the end of the hydraulic cylinder close to the support is provided with a self-locking valve, the balance energy accumulator is connected to the support and located on the side away from the hydraulic cylinder, and the balance energy accumulator and the self-locking valve are connected together through the high-pressure hose. The application solves the problem of poor torque balance of the four-link mechanism of the beam-type pumping unit, reduces the current peak value of the motor, saves the energy of crude oil exploitation, realizes the effect of secondary self-locking protection of the beam-type pumping unit during shutdown, avoids the safety risk of manual locking brake failure, and effectively improves the safety performance of the pumping unit.

The application provides a semiconductor device structure and a preparation method thereof. The semiconductor device structure comprises a back layer of a first conductive type which is composed of a buffer layer of the first conductive type and a freewheeling heavy doped region of the first conductive type under the deep trench field plate, a trench gate and a deep trench field plate which penetrate a body region of a second conductive type and extend into a substrate layer of the first conductive type; and the trench gate which also penetrates the heavy doped region of the first conductive type has a depth smaller than that of the deep trench field plate. The deep trench field plate which is short-circuited with the emitter and arranged on both sides of the trench gate can accumulate a large number of holes when the deep trench field plate is turned on, so that the on-state voltage drop is reduced. Meanwhile, the deep trench field plate optimizes the compromise relationship between the FRD breakdown voltage and the on-state voltage in the RC-IGBT with a vertical electric field distribution, so that the working loss of the RC-IGBT in the freewheeling state is reduced. In addition, the deep trench field plate can quickly extract the carriers in the depletion layer in the freewheeling state, so that the current released in the reverse recovery is reduced, and the peak current in the reverse recovery is reduced.

The invention belongs to the field of lithium battery core testing, and discloses a discharging circuit for suppressing a current peak by utilizing the Miller effect of an MOS (Metal Oxide Semiconductor) transistor, which comprises a booster circuit, a rectifying circuit, a filter circuit, a discharging loop and a tested circuit, the booster circuit is used for amplifying the input voltage and outputting the amplified input voltage to the rectifying circuit; the rectifying circuit is used for converting the alternating current signal output by the booster circuit into a positive signal and outputting the positive signal; the filter circuit is used for smoothing and filtering the signal output by the rectifying circuit; and the discharge loop is used for increasing the discharge speed of the tested circuit and inhibiting the current peak generated at the discharge moment based on the Miller effect of the MOS tube. According to the invention, the Miller effect of the MOS tube is utilized to suppress the current peak generated at the moment of discharging, and the output voltage precision and the discharging speed are not influenced, so that the peak current generated by the internal and external capacitors in the discharging loop at the moment of discharging becomes smaller.