38results about How to "Reduce pre-charge time" patented technology

The present invention provides a vehicle power supply device that is capable of suppressing deterioration of a capacitor, shortening a precharging time, and suppressing power loss. An ECU estimates a polarization condition of a battery after a key has been switched OFF (IG SW_OFF), and opens a main relay after determining that the polarization condition of the battery has been eliminated. Thus, a voltage difference between a battery voltage and a capacitor voltage when the main relay is subsequently reconnected can be reduced. Hence, even when the capacity of the capacitor is increased, the time required for precharging can be shortened, and energy regeneration and so on can be realized efficiently within a short time period after switching the key ON. In this case, a situation in which the post-release capacitor voltage is maintained at an unnecessarily high level can be prevented even when charging polarization occurs in the battery, and as a result, deterioration of the capacitor can be suppressed.

The invention discloses a pre-charging system and method for a modular multilevel inverter, the common DC bus of the modular multilevel inverter is connected with every phase bridge arm of the modular multilevel converter through a current-limiting resistance R1 and a pre-charging initial contactor KM2 in sequence, a pre-charging finishing contactor KM1 is connected with a current-limiting resistance R1 in parallel, and the purpose of pre-charging is achieved by controlling the switch tube of the contactor and the modular neutron multilevel inverter module; according to the method provided by the invention, during the process of pre-charging, the current direction and the sub-module capacitance voltage value of the bridge arm are beyond testing, the workload of the controller is decreased; as the sub-module capacitance voltage value can achieve the rated value in normal operation after pre-charging, the decreasing of the wave form in the initial time when the system operates normally is avoided; and full-automatic pre-charging can be realized by switching on and off the circuit by the contactor, and the safety factor of the system is improved.

The invention provides a pre-charging device and method of an electric automobile. The cathode output end of a battery system is connected with the cathode connection end of a load loop via a controllable switch, and the anode output end of the battery system is connected with the anode connection end of the load loop via a multilevel pre-charging circuit. The multilevel pre-charging circuit can control the resistance of pre-charging resistors in the circuit according to requirements, and further controls the whole pre-charging process. According to the voltage of the battery system and the voltage of the load loop, different pre-charging modes are selected to adjust the resistance of the pre-charging resistors of the multilevel pre-charging circuit, control the pre-charging process, and rapidly improve the voltage of the load loop. According to the multilevel pre-charging method, the pre-charging resistance of the pre-charging loop can be controlled at proper time, the voltage of the load loop is improved, the pre-charging process is optimized, and on the premise that the safety is ensured, time of high-voltage pre-charging is shortened, the whole high-voltage power one time is shortened, and user experience and vehicle performance are improved.

An embodiment of the invention provides a precharge controlling method, including the steps of: providing a voltage generating circuit with an output circuit for outputting a voltage having a necessary level, and a comparator; judging an output voltage from the output circuit in the comparator during a precharge time period, and feeding back an output signal from the comparator to the output circuit; and controlling a precharge voltage until the voltage having the necessary level outputted from the output circuit is reached.

The invention provides a pre-charging device of a motor controller. The pre-charging device is applied to the motor controller of an electric vehicle. The pre-charging device comprises a power battery, a supporting capacitor, a contactor and a pre-charging circuit, wherein the contactor and the pre-charging circuit are arranged between a positive electrode of the power battery and a positive electrode of the supporting capacitor; the pre-charging circuit comprises a sequential control circuit and a pre-charging path; the pre-charging path comprises first and second pre-charging paths consisting of two MOS (Metal Oxide Semiconductor) transistors; the sequential control circuit is used for controlling sequential switch-on of the two MOS transistors. Through sequential switch-on of the first and second pre-charging paths, the supporting capacitor is charged. The pre-charging time is effectively shortened to facilitate driving; a conventional relay is substituted by using the MOS transistors, so that the performance is more stable and reliable.

A nonvolatile memory device includes a page buffer circuit. The page buffer circuit includes a memory cell area, a first bit line select unit, and a second bit line select unit. A plurality of memory cells of the memory cell area is connected by bit lines and word lines. The first bit line select unit i s connected to one or more bit lines of the memory cell area and is configured to precharge or discharge a selected bit line in response to a control signal. The second bit line select unit is connected to the same bit line as the first bit line select unit and is configured to precharge or discharge the selected bit line simultaneously with the first bit line select unit.

A high voltage generation circuit comprises a first boosting unit, a second boosting unit, a delay circuit which delays the output of the first boosting unit as applied the second boosting unit, a pre-charge unit, and switch units which connect respective nodes in response to control signals. A voltage supply circuit is also provided that converts an externally supplied power source voltage (VCC) to a predetermined pre-charge voltage (VPP2).

The invention discloses a method for pre-charging lithium ion batteries, positive electrode active materials of which are made of mixed materials of lithium cobalt oxide and lithium nickel cobalt oxide. The method adopts phase-type charging, comprising at least two charging steps. The charging current of the second charging step is larger than that of the first charging step, and the total pre-charging amount of the first charging step and the second charging step is 25%-45% of the total lithium ion battery capacity. The pre-charging method of the invention can greatly reduce the pre-charging time and significantly improve the production efficiency.

The invention discloses a method for controlling the pre-charge state of an electric vehicle. The method comprises the steps of (1) determining whether a pre-charge condition is satisfied or not, (2)calculating a difference between a battery system voltage and a load circuit voltage, (3) calculating the accumulated calorific value of a pre-charge resistor after the completion of the pre-charge, not allowing the pre-charge if the accumulated calorific value is greater than a preset calorific value, otherwise, allowing the pre-charge, (4) performing the pre-charge or prohibiting the pre-charge,(5) calculating a real-time total calorific value of the pre-charge resistor in a pre-charge process, stopping the pre-charge if the real-time total calorific value is larger than a pre-charge presetcalorific value, otherwise, continuing the pre-charge, (6) waiting for a next pre-charge command, calculating a time interval between two times of pre-charge, and (7) calculating an accumulated calorific value of a last time. According to the method, a loop load voltage and the calorific value of the pre-charge resistor are used as conditions for allowing pre-charge, the pre-charge efficiency ofthe electric vehicle can be improved, and the service life of a pre-charge loop component is prolonged.

A block word line precharge circuit that precharges a block word line connected to the gates of transistors, for transferring bias of global word lines to local word lines, respectively. During a precharge period of the block word line, a program voltage, a read voltage and a pass voltage are all shared. Accordingly, a precharge time of the block word line can be reduced.

The invention discloses a pre-charging method of a lithium ion battery with cobalt acid lithium as a positive active material, which adopts staged charging, and comprises at least two charging steps, wherein charging current of a second charging step is larger than the charging current of a first charging step, and the total pre-charging quantity of the first charging step and the second charging step is 10%-34% of the total electric quantity of the lithium ion battery. The pre-charging method of the invention can greatly shorten the pre-charging time and greatly improve the production effect.

The invention discloses a pre-charging method for a lithium ion battery. The positive electrode active material of the lithium ion battery is a nickel-cobalt-aluminum material, and the pre-charging method comprises a stage type charging step and a constant-voltage charging step in sequence, wherein the stage type charging step comprises a first charging step and a second charging step in sequence; the current in the first charging step is lower than that in the second charging step; and the pre-charging electric quantity in the first charging step is 20-40% of the total electric quantity of the lithium ion battery. By adoption of the pre-charging method, a cell can achieve equivalent or even better electrical performance as the cell which adopts a conventional low-current long-term pre-charging process; and meanwhile, the pre-charging time is shortened, and production efficiency is improved.

The invention discloses a high-voltage DC stepped constant current closed loop precharge circuit, which comprises a power transistor control and current sampling module, a constant current closed loopdriving circuit module, an MCU microcontroller processing module and a current reference generation module, wherein the power transistor control and current sampling module is used for gate control of the power transistor and sampling of charging current and a sampling result is sent to the constant current closed loop driving circuit module; the current reference generation module is used for sending charging current reference to the constant current closed loop driving circuit module; the constant current closed loop driving circuit module is used for controlling the gate voltage of the power transistor of the power transistor and current sampling module through simulating PID according to the charging current reference of the current reference generation module and the sampling result;and the MCU controller processing module is used for controlling the current reference generation module and the constant current closed loop driving circuit module.

A method and system for high speed bussing in microprocessors and microelectronic devices is disclosed. The method and system implement a type of differential bus with distributed bus pre-charge units designed to decrease bus pre-charge time. The method and system utilize a universal self-tracking clock signal to determine the minimum required bus pre-charge time. The time saved by decreasing the bus pre-charge time can be directly applied to the bus evaluation period thereby increasing system performance and reliability.

The invention discloses a formation method of a lithium battery, wherein the formation method of the lithium battery is high in efficiency, high in uniformity, and fast. According to the formation method of the lithium battery, a process of aging is not needed, and only a process of charging is needed, and the charging amount is 8%-20% of the whole capacity of the battery. Production time is greatly shortened. Production efficiency is improved. And quality of products is improved at the same time.

The invention discloses an electric vehicle, a charger thereof, and a charger control method. The charger comprises: a pre-charging switch; a pre-charging resistor and a first pre-charging capacitor which are connected with the pre-charging switch; an alternating current switch; an alternating current module connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor; a second pre-charging capacitor connected with the alternating current module in parallel; a high-voltage direct-current module connected with the second pre-charging capacitor inparallel and connected with a high-voltage battery pack; and a controller used for controlling the high-voltage direct-current module to pre-charge the second pre-charging capacitor, closing the pre-charging switch to charge the first pre-charging capacitor through a power grid after the voltage of the second pre-charging capacitor is greater than a first preset threshold value and less than a second preset threshold value, and closing the alternating-current switch after the first pre-charging capacitor finishes pre-charging. Therefore, the pre-charging time can be greatly shortened, so thata relatively large current is effectively prevented from being generated when a relay is attracted, the relay is prevented from being sintered, and the reliability of the system is improved.

The invention discloses a hydrogen energy automobile multi-pre-charging PDU system comprising a power supply module which comprises a power supply contactor and a power battery, the power supply contactor is connected with a power supply, and the power battery is connected with the power supply contactor; a pre-charging module which comprises an auxiliary high-voltage system pre-charging module, ahydrogen fuel cell high-voltage system pre-charging module and a chassis driving high-voltage system pre-charging module; and a pre-charging system which comprises an auxiliary high-voltage system, ahydrogen fuel cell high-voltage system and a chassis driving high-voltage system. The invention discloses a pre-charging method of the hydrogen energy automobile multi-pre-charging PDU system. The pre-charging method comprises the steps that pre-charging of a high-voltage system is assisted; a hydrogen fuel cell high-voltage system is pre-charged; and the chassis driving high-voltage system is pre-charged. According to the invention, the pre-charging time can be shortened, the pre-charging waiting time is reduced, the structure of the high-voltage power distribution system can be optimized, and the failure rate is reduced.

A semiconductor memory device includes a memory bank configured to store data, a buffering unit including a plurality of buffers, which are disposed to extend to a X-axis of the memory bank to store data transferred from the memory bank, a plurality of data transmission lines configured to transfer the data stored in the plurality of buffers, and a path multiplexing unit configured to select one of a plurality of data transmission paths in response to addresses and transfer the data through the selected data transmission path.

The present invention provides a semiconductor device and a control method thereof, the semiconductor device including: a bit line connected to a memory cell; a voltage control circuit controlling a voltage supplied from a voltage source to the bit line; a differential amplifier circuit providing the control voltage to the voltage control circuit in response to a voltage at a node coupled to the bit line and a reference voltage; and a current source providing a current to the differential amplifier circuit. The current source provides more current to the differential amplifier circuit in the first period including a period for precharging than in the second period after precharging.

The invention discloses a shift temporary storage circuit and a display device. The shift temporary storage circuit comprises a multiple stages of shift temporary storage units, wherein the shift temporary storage units are arranged in a cascading manner and comprise charging modules, a pre-charging signal input end of one charging module is electrically connected with a pull-up point of the frontstage of the shift temporary storage unit, and when the pull-up point of the shift temporary storage unit is pre-charged, and a pull-up signal of the pull-up point of the front stage of the shift temporary storage unit is in a high-level state. According to the technical scheme, the pre-charging time required in a shift temporary storage circuit is shortened, and the waveform of a scanning signalis optimized, so that the display effect of the display device is improved.

The invention relates to a frequency converter with a rectifier (1) on the input side and at least one support capacitor (3) arranged downstream of the rectifier (1). The rectifier (1) has multiple half-bridges (6), via which a respective input-side phase (U, V, W) of the rectifier (1) feeds the support capacitor (3). The input-side phases (U, V, W) are connected to grid-side phases (L1, L2, L3) of a multiphase supply grid (5) via a preceeding circuit (4). Each grid-side phase (L1, L2, L3) is connected to one of the input-side phases (U, V, W) within the preceeding circuit (4) via a respective phase capacitor (9). Each grid-side phase (L1, L2, L3) is additionally directly connected to another input-side phase (U, V, W) within the preceeding circuit (4) via a respective switch (10) such that the grid-side phases (L1, L2, L3) are short-circuited with the input-side phases (U, V, W) when the switches (10) are closed, and each phase capacitor (9) connects two grid-side phases (L1, L2, L3) or two input-side phases (U, V, W) together. The frequency converter has a controller (11) which keeps the switches (10) open when pre-charging the support capacitor (3) and closes the switches when a specified charge state (Z1) of the support capacitor (3) is reached.