613 results about "Off time" patented technology

The invention discloses an energy storage system and a parallel operation control method thereof. The system comprises a battery cluster, a battery management system and an energy storage converter. The battery management system is respectively connected with the battery clusters and the energy storage converter, and the plurality of battery clusters are connected with the energy storage converter through the coupling circuit. Wherein a pre-charging equalization loop is arranged between the battery cluster and the energy storage converter, and the battery management system is used for controlling connection or disconnection of a circuit. The battery management system is also provided with a threshold module which is integrated with a plurality of parallel operation thresholds and is used for judging the switching-on or switching-off time of the contactor. By constructing a coupling system containing a pre-charging equalization loop, the problems of impact current and device damage caused by large inter-cluster voltage difference in the parallel operation process of a traditional multi-battery energy storage system are solved; and meanwhile, through a strategy of setting multiple parallel operation threshold values, targeted current balancing can be carried out according to different dynamic working conditions and electric energy parameter differences, the impact current is prevented from being too high, components are protected, and the operation stability of the system is improved.

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

The invention relates to an intelligent identification and conversion control method for a charging interface of a multi-standard charging pile in the field of new energy automobiles, and the method comprises the steps: carrying out the mode matching analysis of interface physical feature data and communication signal feature data, and obtaining a preliminary classification result of the type of a charging interface device; according to the loading result of the communication configuration parameters, obtaining a confirmation feedback signal of successful protocol switching; judging whether the load demand data conforms to a rated output power range of a charging interface device or not; according to the authorization instruction, current intensity data including a peak value and an average level and voltage level data including a fluctuation amplitude in the charging process are monitored in real time; if the current intensity data or the voltage level data exceed a preset safety threshold value, power supply connection is disconnected, and a circuit path is cut off; and generating a power-off record log containing abnormal fluctuation data and a power-off moment according to a result of disconnecting the power supply connection.

The present invention provides a control circuit of an isolated power supply and an isolated power supply. A secondary side controller in the control circuit can turn on and off a synchronous rectifier based on a voltage from a secondary side winding, enabling adaptive turn-on and turn-off control of the synchronous rectifier. Specifically, when the voltage from the secondary side winding reaches a second predetermined voltage, an instruction for turning off the synchronous rectifier is provided. The second predetermined voltage is adjusted based on a comparison between a time interval for the previous switching period and a predetermined reference interval. In this way, a delay from a turn-off time of the synchronous rectifier to a turn-on time of a primary transistor switch is substantially maintained at the predetermined reference interval. This prevents cross-conduction of the primary and secondary side circuits, ensuring safe operation of the isolated power supply.

The invention provides an IGBT (Insulated Gate Bipolar Translator) turn-off time measuring method, system, equipment and medium, and belongs to the field of power semiconductor device testing technology and state monitoring, and the method comprises the following steps: firstly, selecting 20% Vdc and 80% Vdc as turn-off initial measuring points, secondly, carrying out first error correction by adopting a linear estimation method, and finally, carrying out second error correction by adopting a linear estimation method; performing linear fitting on the voltage difference Vce data through a least square method to obtain initial turn-off time; and finally, aiming at systematic deviation caused by inherent concavity and convexity characteristics of the voltage curve, performing secondary error correction by adopting a convex hull algorithm, acquiring a lower envelope line of the ic-tOFF relation curve through an Andriw algorithm, and identifying and eliminating the problem of Overestimation of the turn-off time based on a convex hull accurate point set. According to the invention, accurate measurement of the turn-off time of the IGBT under the condition of low sampling rate is realized, the hardware cost is significantly reduced, and a reliable technical basis is provided for IGBT state monitoring and life prediction.

The invention provides a power-on and power-off control method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining module enabling input which is used for indicating power-on or power-off; determining each target power supply to be controlled and a control time sequence of each target power supply from each power supply based on the module enabling input, and generating a trigger signal and an expected output for each target power supply; and determining a first target power supply to be controlled based on the control time sequence among the target power supplies, sending a trigger signal to the first target power supply, and sending a trigger signal to the next target power supply after the output of the first target power supply is consistent with the expected output, thereby overcoming the defect that the power-on and power-off time sequence control of the complex equipment in the traditional scheme depends on an external circuit. The power-on and power-off control circuit has the advantages that the defects of difficulty in accurate control in the prior art are overcome, accurate control of any power-on and power-off time sequence can be realized without a complex circuit, simplicity, high efficiency and accuracy of a control process can be guaranteed, and sleep and sleep functions of equipment can be compatible.

The invention discloses a power modulation method and system for an all-solid-state power supply, and belongs to the technical field of pulse power. The method comprises the following steps: converting a target waveform into a multi-level discrete waveform, and segmenting the multi-level discrete waveform into a plurality of continuous sub-waveforms according to polarity; for each sub-waveform, identifying all level switching moments, obtaining a time-level number corresponding relation, and generating a corresponding switching action time sequence matrix; the row index of the switching action time sequence matrix corresponds to the level number, the odd-numbered columns store the turn-on time parameters of the switching devices under the corresponding level number, and the even-numbered columns store the turn-off time parameters of the corresponding switching devices; and converting the switching action time sequence matrix into period counting based on an FPGA main clock, and generating a corresponding driving pulse signal by the FPGA according to time sequence data so as to control a switching device in the all-solid-state power supply and carry out power modulation. High-real-time and high-precision control on the switch of the solid-state power supply is realized, and the effect of arbitrary waveform power modulation is realized.

The invention discloses an intelligent integrated power supply, and particularly relates to the field of power supply intelligent control, the intelligent integrated power supply comprises a power supply body, the input end of the power supply body is connected with a main power supply and a standby power supply in parallel, the output end of the power supply body is connected with load equipment, and a super capacitor buffer module is arranged in the power supply body; the super capacitor buffer module is connected in parallel between the main power supply and the standby power supply, and an intelligent prediction control unit is further arranged in the power supply body and used for predicting the expected power-off time of the power supply body when the power supply input is switched next time. And if the predicted expected power-off time is less than the maximum buffer time of the super-capacitor buffer module, starting the super-capacitor buffer module to supply power and executing a power input switching action, otherwise, activating the standby power supply in advance. According to the invention, the problem of instantaneous power failure in the switching process is solved through a power supply seamless switching scheme in which the super capacitor buffer module and the intelligent prediction algorithm cooperate.

A rectifier includes digital timers to control FET switching rather than direct measurement of current and / or voltage. The digital timers control turn-off time to compensate for a delay produced by comparators in the rectifier. The digital timers are adjusted over multiple cycles to arrive at a turn-off time that produces zero current turn-off. The digital timers may be periodically or continuously readjusted based on a preceding set of cycles. Adaptive turn-off via digital timers is useful for discontinuous conduction mode suppression.

The present application provides a tumor electric field treatment system. The tumor electric field treatment system comprises an electric field treatment device and two pairs of the insulated electrodes electrically connected to the electric field treatment device. The AC signal controller is configured to generate control signals with respective time periods and at least two cyclically switched output states. The AC signal generator is configured to generates an alternating electric signal, and according to the output state of the control signals generated by the AC signal controller, cyclically and alternately apply the generated alternating electric signal to the insulated electrodes in pairs, so as to alternately generate alternating electric fields between the two pairs of insulated electrodes. The alternating electric signal applied to the insulated electrodes in pair have respective continuous on-time periods, and each continuous-on time period comprises an initial switching-on time period, an intermediate on-time period and a final switching-off time period. During the switching-on time period, the AC voltage value of the alternating electric signal applied to the insulated electrodes in pair rises from 0 to a specific voltage at a constant speed. During the switching-off time period, the AC voltage value of the alternating electric signal applied to the insulated electrodes in pair decreases from a specific voltage to 0 at a constant speed.

The invention discloses an anti-saturation equivalent virtual impedance grid-forming type SVG fault current-limiting control method, which comprises the following steps of: inverting a direct current into an alternating current through an inverter, and filtering high-frequency harmonics through a filter to obtain a sine wave alternating current meeting a grid-connected requirement. A three-phase alternating current signal is collected in real time, coordinate transformation is carried out through a Park transformation module, and a modulation signal is obtained. The modulation signal is compared with a triangular carrier signal, a driving signal is generated, the on-off time of a power switching device of the inverter is controlled, the amplitude and phase of output voltage and current are adjusted, accurate control over the output power of the grid-connected inverter is achieved, and the power grid access requirement is met. According to the method, the limitation of traditional fixed parameters is broken through, and the robustness of the system to a complex fault scene is improved. In addition, manual intervention or a complex mode switching program is not needed, automatic smooth transition between different working conditions can be achieved, and powerful technical guarantee is provided for stable operation of a power grid.

The invention discloses a hybrid switch driving method based on model prediction junction temperature control, and the method comprises the steps: obtaining the real-time shell temperature value and junction temperature value of a Si IGBT device, and the real-time shell temperature value and junction temperature value of a SiC MOSFET device, constructing the relation between the junction temperature and the shell temperature of each device, and building a junction temperature prediction model and a loss prediction model of a hybrid switch, and constructing a cost function through the junction temperature prediction model and the loss prediction model, and controlling the on-off of the hybrid switch through the soft turn-off time corresponding to the minimum value of the cost function. Compared with the prior art, collaborative optimization of power loss is realized while junction temperature distribution between the Si IGBT and the SiC MOSFET device is balanced, that is, the power loss of the hybrid switch is reduced, and the stability and the operation efficiency of the hybrid switch are effectively improved.

The invention discloses a load transient detection circuit of a COT Buck, a corresponding COT Buck and a switching power supply. The load transient detection circuit comprises an input end, three resistors connected in series, two comparators and a switched capacitor sampling hold circuit, wherein the input end is grounded after passing through the three resistors in sequence. A node between the input end and the first resistor and a node between the second resistor and the third resistor are connected to the input ends of the first comparator and the second comparator through a switched capacitor sampling hold circuit structure. Valley voltage information and peak voltage information of inductive current are obtained through the switched capacitor sampling hold circuit, whether a load is transiently changed or not is judged by comparing inductive current ripples with a valley value and a peak value, and it is guaranteed that the switching power supply has appropriate transient detection trigger threshold voltage under any load. According to an output signal of the load transient detection circuit, the COT Buck can increase the turn-on or turn-off time so as to enhance the transient response speed.

The invention provides a conduction time control circuit and a switch conversion system, and relates to the technical field of electrical control. For any sampling period, a ramp signal generation module in the turn-on time control circuit generates a ramp signal according to the input voltage; the peak value sampling module is used for acquiring the peak voltage of the ramp signal in the current sampling period; the error amplification module determines an error signal according to the peak voltage and the output voltage; the on-time generation module generates a state indication signal according to the error signal and the ramp signal, so that the charging module adjusts its own charging / discharging state according to the state indication signal to adjust the peak voltage of the ramp signal in the next sampling period, thereby improving the on-off time of a switching tube under the DC-DC converter. On the basis, on the basis of improving the accuracy of the on-off time of the converter, the problems of structural complexity and high power consumption of the control circuit can be reduced.

The invention relates to the technical field of output control, in particular to a COT-based constant voltage control method, device and equipment and a storage medium, and the method achieves the precise control of the total duration of a target period through the dynamic adjustment of the turn-off time on the basis of the fixed turn-on time, can quickly respond to the sudden change of a load, and improves the stability of the load. The overshoot or undershoot phenomenon of the output voltage is reduced; specifically, voltage information is sampled in real time within the period conduction time, and the turn-off time of the next period is immediately adjusted after the period is ended, so that error accumulation caused by delayed adjustment in a traditional control mode is avoided, the dynamic response capability to battery voltage fluctuation is enhanced, and the output precision is improved; besides, a strategy of synchronous opening and unified adjustment of turn-off time is adopted, so that the consistency of the turn-off time of multi-path output in a starting stage and a subsequent period is ensured, load change disturbance caused by asynchronous turn-off is avoided, and voltage rise deviation of a later turn-off channel is reduced.

The invention discloses a communication power supply load measurement and calculation and air switch control method and system based on service priority, and relates to the technical field of communication power supply intelligent management. Comprising the following steps: initializing and acquiring a load service priority list and a time threshold; monitoring an AC input state, switching to a standby power supply mode when the AC input state fails, and recording a power-off moment; a hybrid algorithm of ampere-hour integration and dynamic voltage calibration is adopted to measure the residual capacity of the storage battery in real time and with high precision, and residual power supply time is dynamically predicted; when the waiting time exceeds a first threshold value and the remaining power supply time is smaller than a second safety threshold value, a turn-off instruction is generated; and dynamically generating a turn-off sequence from low to high according to the service priority list, and iteratively executing turn-off and state re-evaluation until the endurance safety requirement of the core service is met. According to the invention, the problems of low control precision, incapability of distinguishing service priorities and low resource utilization rate in the prior art are solved, and accurate, intelligent and service-aware power management is realized.

The invention provides a direct-current circuit breaker and a control method thereof, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The short circuit turn-off branch comprises a first capacitor and a first thyristor; the coupling commutation branch comprises a first inductor, a second inductor, a second thyristor and a third capacitor; the rated turn-off branch comprises a first resistor and a second capacitor; the first resistor, the second capacitor, the first capacitor and the second inductor are sequentially connected in series and then are connected with the main switch branch in parallel; the first inductor, the second thyristor and the third capacitor are sequentially connected in series, and the first inductor and the second inductor form mutual inductance. By controlling the on-off of the first thyristor, the first capacitor and the second capacitor are connected in series, the capacitance value is reduced, large-capacitance-value operation of a single group of capacitors is realized, and the problem that the on-off time of rated and lower low-current breaking is relatively long can be solved.

The application discloses an energy-saving control method of a CSR high-frequency PWM rectifier circuit. According to the value change of each line voltage of three-phase alternating current in a rectifier circuit and the characteristic that the rectifier circuit works at a high frequency, the two pulse wave edges of two phases of the three-phase alternating current are overlapped. The overlapping time of the overlapping of the two pulse wave edges is equal to the sum of the turn-on time and the turn-off time of a switching tube, so that the front edge or the rear edge of a pulse of a switching signal is in a soft switching state or in a cut-off low voltage state, thereby reducing the switching process loss of the switching tube. The application provides the energy-saving control method of the CSR high-frequency PWM rectifier circuit, which can reduce switching loss, reduce cost, save energy, prolong service life and is safe and reliable.

A voice coil motor (VCM) in a hard disk drive is operated in a discontinuous mode with an alternation of on and off times. A drive current to the VCM is facilitated and countered with a variable voltage across the during the on-times and off-times. The intensity of the drive current is controlled as a function of a Back ElectroMotive Force (BEMF) of the VCM. A method includes sampling during the alternation of on-times and off-times first and second values of the voltage across the VCM. The first value is sampled at a first time in response to the end of the off-time. The second value is sampled at a second time in response to the drive current of the VCM zeroing following the supply of drive current to the VCM being countered during the off-time. The BEMF is calculated as a function of first and second values.

The utility model discloses an automatic switching device for a DC power supply, and the device comprises a main control module which is used for obtaining the potential difference of two DC buses at different sampling moments through a voltage detection module, and obtaining a target voltage according to the potential difference; and if it is monitored that the bus battery pack voltage of one section of direct-current bus is abnormal based on the target voltage, controlling a contactor to pull in so as to make the two sections of direct-current buses parallel, thereby using a normal power supply to supply power to the abnormal direct-current bus. According to the invention, a normal power supply is automatically and quickly used to replace an abnormal power supply to supply power to the DC bus with abnormal power supply, the current situation of passive and hysteresis operation of personnel is changed, uninterrupted power supply is realized, the power failure time is reduced, loss caused by power failure is avoided, the user experience is improved, and the application prospect is wide. According to the invention, automatic switching of the dual power supplies during fault, maintenance and operation mode adjustment is realized, the operation of operation and maintenance personnel on equipment is reduced, and the safety coefficient of operation is improved.

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 power management method and system of a vehicle-mounted MCU, electronic equipment and a storage medium, and relates to the field of vehicle chips.During starting, a first core and a second core are powered on at the same time, and the first core starts an external power supply interface and a power supply according to a preset time sequence; when the first core needs to be switched to the dormant state, the first core interacts with the vehicle-mounted module to obtain vehicle parameters, after the dormant mode is judged, the peripheral power supply is turned off, the second core is started to monitor and wake up a source interface, and the first core enters an under-voltage dormant state; when the second core detects the wake-up condition and the power-off duration of the first core reaches the standard, the second core is controlled to restore power supply and transmit wake-up source information; after the first core is powered on, key data are read, the data are recovered after the integrity is verified through the check code, and then the external core and the external power supply are started according to a preset time sequence. According to the scheme, low-power-consumption operation, rapid and reliable awakening and data safety guarantee of the vehicle-mounted MCU are achieved through dual-core cooperation, dynamic dormancy judgment and data verification backup mechanisms, and the vehicle-mounted MCU is adaptive to vehicle-mounted complex working conditions.

The invention provides a replacement method and system for partially replacing a control cabinet in a live-line mode, and relates to the technical field of general control or adjustment systems. The system further comprises a constructor management module, a new cabinet body position planning module, a KKS management module, an old cabinet internal power failure interval division module, an old cabinet information acquisition module, a fuzzy line number traceability module, a construction table generation module and a construction risk prompt module which are in data connection with the processor. The problem that data cannot be monitored normally due to long power-off time in the prior art is solved.

A vehicle receives SoC information of the battery when the vehicle is in a parked state, determines whether a charged amount of the battery is lower than or equal to a preset charged amount based on the received SoC information of the battery, determines whether a current time is included in a use time zone based on use time information of the remote service when it is determined that the charged amount of the battery is lower than or equal to the preset charged amount, adjusts a cut-off time point of power supply of the battery in response to whether the current time is included in the use time zone, and transmits a power supply cut-off command of the battery to the battery management apparatus.

The invention relates to the technical field of output control, in particular to a constant power control method, device and equipment based on COT and a storage medium, according to the method, fixed turn-on time is combined with dynamic turn-off time adjustment, the conciseness of COT control is reserved, accurate control over output power is achieved, and the control efficiency is improved. The influence of interference factors such as battery voltage drop and load abrupt change on constant power output can be effectively counteracted; specifically, a multi-path output synchronous opening design is adopted, and unified turn-off time adjustment logic is combined, namely, the turn-off time of a (k + 1) th period is calculated according to the total duration of a target period, so that an asynchronous turn-off condition caused by parameter differences of all channels is avoided, and the voltage rise deviation generated by load changes of a later turn-off channel is reduced; real-time output voltage and load resistance are respectively sampled in one period, battery voltage fluctuation and load change are monitored in real time, and error accumulation caused by the fact that a measured value in the current period is extended to the next period to be adjusted is avoided.

The invention discloses a test method for a vehicle unlocking function, electronic equipment, a storage medium and a product, and relates to the technical field of vehicles, and the test method for the vehicle unlocking function specifically comprises the steps: determining a target impact parameter, so as to enable a test bench fixed with a test vehicle to execute a target action based on the target impact parameter; controlling the test vehicle to enter a collision mode; and controlling the test vehicle to enter a main power supply cut-off state according to a preset first power-off time point, and detecting a vehicle unlocking result of the test vehicle in the main power supply cut-off state. By adopting the method and the device, the reliability of the unlocking function in an extreme environment can be verified under the condition that the tested vehicle does not need to be actually damaged, so that the cost required by the unlocking function testing process is greatly reduced.

The invention discloses a battery static maintenance time prediction method and system, and mainly relates to the technical field of vehicle storage battery state monitoring and prediction. Comprising the following steps: collecting battery parameters of a vehicle at multiple power-off moments and power-on moments, and collecting data in a classified manner according to an electric switch state of a storage battery power supply 30; based on the collected battery parameter data, training a self-feedback radial basis function neural network (RBFNN) model; during the power-off period of the vehicle, the battery parameters at the last power-off moment are read regularly, the corresponding trained RBFNN model is selected according to the state of the 30-electric switch, and the battery parameters are input to predict the static maintenance time; and calculating the time difference from the current time to the last power-off time and the remaining holding time, comparing the remaining holding time with a preset time threshold value, and sending charging reminding information to the user through the cloud system. The method has the beneficial effect that the problems of battery loss and incapability of starting the vehicle due to long-term static state of the vehicle can be effectively avoided.

The invention discloses a CRM totem pole three-phase interlaced PFC control method, which comprises a signal sampling circuit, a filter circuit, a control circuit, an auxiliary winding circuit and a main power loop circuit, adopts a voltage mode control strategy, does not need a current inner loop, and simplifies a control system. The signal sampling circuit comprises an input voltage sampling circuit, an output voltage sampling circuit, an auxiliary winding voltage sampling circuit and an inductive current sampling circuit. The main power loop circuit comprises a first phase circuit, a second phase circuit and a third phase circuit which are mutually staggered and connected in parallel. The auxiliary winding circuit is used for controlling the turn-on time of the active tube, and the inductive current sampling circuit is used for controlling the turn-off time of the follow current tube, so that soft turn-on of the active tube in a full input voltage range is realized. The method can be expanded to an N-phase interleaving PFC system, and high-frequency current ripples are reduced through phase shift control. The method is suitable for occasions with high requirements on power supply performance, such as server power supplies and electric automobiles.

The present invention relates to the technical field of SiC power devices, and more specifically, to a multi-layer circuit protection structure for SiC power devices. The structure comprises at least two SiC power devices, each of which is connected in parallel; and a drive circuit, wherein each gate of each SiC power device is connected to a turn-on path and a turn-off path. By improving the drive circuit, the present invention achieves a structure in which the drive circuit differentially adjusts the gate resistance of each device to offset the switching time difference caused by Vgs-th differences, thereby reducing or compensating for the turn-on and turn-off time differences caused by Vgs-th differences, and solving the problem of thermal runaway caused by large Vgs-th differences.

The scheme discloses a low-cost high-side over-current protection circuit and an over-current protection method thereof, and the circuit comprises a sampling resistor which is connected in series with a positive wire of a bus; the light-emitting diode is connected in parallel with the sampling resistor; a photosensitive device coupled to the light emitting diode; the signal processing circuit is connected to the photosensitive device and is used for outputting a latch signal representing overcurrent based on the overcurrent signal; the PWM driving hardware circuit is connected to the photosensitive device; and the control circuit is connected to the signal processing circuit and the PWM driving hardware circuit and is used for controlling the PWM output to be turned off based on the latch signal. According to the scheme, a high-speed and reliable response effect is achieved, firstly, PWM is rapidly turned off on the hardware level based on an overcurrent signal, and high-speed hardware response is achieved; and secondly, the overcurrent signal is latched for a period of time through the latch logic, so that on one hand, the PWM turn-off time is prolonged, the current is prevented from instantly recovering work after rapid drop, and on the other hand, enough time is provided for the control circuit for logic processing, and the response reliability is realized.