11results about How to "Voltage balance" patented technology

The invention discloses an energy storage system and a voltage balance control method thereof, and belongs to the technical field of energy storage. The energy storage system comprises at least two battery clusters, each battery cluster comprises at least two battery packs and DCDC converters thereof, the battery packs and the DCDC converters are in one-to-one correspondence, the input end of each DCDC converter in each battery cluster is connected with one battery pack, and the output end of each DCDC converter in each battery cluster is connected with the DCDC converters of the same battery cluster and other battery clusters in parallel. The system can solve the problems that in the prior art, when battery clusters are combined, circulation is likely to be generated due to voltage imbalance, and the capacity of the battery clusters is affected.

The invention discloses a charging and discharging device, an adapter and electronic equipment, and the device comprises at least two charging and discharging interfaces which are used for connecting power supply equipment or power receiving equipment; the input ends of the switching tubes are connected with the charging and discharging interfaces in a one-to-one correspondence manner, and the output ends of the switching tubes are connected with the input end of the voltage balancing circuit; the output end of the voltage balancing circuit is connected with the input end of the bidirectional conduction element, and the voltage balancing circuit is used for balancing the voltage among the switching tubes, so that the voltage among the switching tubes is balanced; the output end of the bidirectional conduction element is connected with a load, and the bidirectional conduction element has an on-off state; and the power management module is connected with the bidirectional conduction element and all the switching tubes and is used for controlling the on-off states of the bidirectional conduction element and all the switching tubes so as to realize single-path or multi-path bidirectional charging of the load through the power supply equipment or single-path or multi-path bidirectional discharging of the load through the power receiving equipment. The charging and discharging device provided by the invention realizes a flexible and selectable bidirectional charging and discharging function.

The present application relates to the technical field of energy storage power supply, and mainly provides a resonant cavity current control circuit and an energy storage system, the circuit comprising a voltage regulating module, a voltage detection module connected with the voltage regulating module and a clamping control module, the voltage detection module and the voltage regulating module are also connected with a first bus capacitor and a second bus capacitor. The voltage detection module is used for detecting the bus voltage of the two bus capacitors, and when there is a difference between the two bus voltages, the voltage regulating module is controlled to work to adjust the first bus voltage and the second bus voltage. When the voltage regulating module works, the clamping control module will control the voltage regulating module to stop working when it is determined that the current signal of the voltage regulating module does not meet the preset condition. Based on this, the bus voltage balance can be realized through the voltage regulating module, and then the two LLCs in the three-level inverter work at the same time, without the need for a single LLC to bear excessive peak current, thereby reducing the cost, improving the service life and reliability of the system.

The application relates to a kind of equalization circuits of multiple lithium battery groups in series, the negative pole of lithium battery group is connected with the negative pole of voltage sampling unit, the negative pole of capacitor C3 and the negative pole of winding L1, the positive pole of lithium battery group 1 is connected with the anode of diode of photoelectric coupler G1 and G2, the positive pole of voltage sampling unit, the positive pole of capacitor C3, the cathode of rectifier diode D1, the anode of rectifier diode D1 is connected with the positive pole of winding L1, the cathode of diode of photoelectric coupler G1 and G2 is connected with two enable ends of voltage sampling unit, the power supply positive pole and negative pole of equalization driving unit are connected with the cathode and anode of voltage stabilizing diode D5 in voltage dividing circuit in parallel, the output end of equalization driving unit 31 is connected with the gate of field effect transistor T1, the source of field effect transistor T1 is connected with the positive pole of winding L5, the negative pole of winding L5 is connected with the positive pole of total lithium battery group, the application effectively solves the capacity difference problem existing between series lithium battery groups, can make the voltage of lithium battery group equal, so that lithium battery group capacity is fully utilized.

The application provides a charging control module, a method, a smart terminal and a charging system. The charging control module comprises a charging unit, at least two batteries, at least two switch tubes and a control unit. The charging unit is connected with the positive poles of the at least two batteries, the negative poles of the batteries are respectively connected with the first ends of the switch tubes, the second ends of the at least two switch tubes are connected with each other and grounded, and the control unit is connected with the control ends of the switch tubes. During the charging process of the charging unit for the batteries and / or during the discharging process of the batteries, the control unit controls the voltage difference between the two batteries through the switch tubes. The above technical scheme can control the voltage difference between the at least two batteries, ensure the voltage balance during the charging and discharging, and improve the charging efficiency.

The invention belongs to the technical field of power electronics, and relates to a SiC device five-level split inverter pulse rejection modulation method and system, and the method comprises the steps: generating two groups of reverse laminated carriers according to a set reference signal, generating two different carrier signals according to the sizes of the two groups of reverse laminated carriers and a set modulation wave, and outputting the two different carrier signals. Two auxiliary modulation waves are generated according to the actual voltage of the floating capacitor, the expected lower limit threshold value and the expected upper limit threshold value, a low-frequency driving signal is generated according to the size of the set modulation waves, and a high-frequency driving signal of each phase is generated according to the size of the output current of each phase, the auxiliary modulation waves and the carrier signal. A high-frequency driving signal is generated only in a half fundamental wave period, and a low-frequency driving signal is generated in the other half period, so that the loss of the driving circuit is effectively reduced, dead-zone time does not need to be added between the high-frequency driving signals, the dead-zone effect is avoided from the source, the current output harmonic wave is reduced, the current distortion is reduced, and the output current quality is improved; and the voltage balance of the suspension capacitor is kept through the adjusting effect of the auxiliary modulating wave.

The application relates to the technical field of lithium batteries, in particular to a storage battery equalization device and an equalization method. The storage battery equalization device comprises a main control chip, a storage battery pack, a plurality of bidirectional converters and a low-voltage bus; a plurality of single batteries of the storage battery pack are arranged in correspondence with the plurality of bidirectional converters; the main control chip can calculate the electric quantity value of each single battery and screen out the single batteries with the highest and lowest electric quantity values; when the difference between the highest and lowest electric quantity values reaches a predetermined electric quantity value, the main control chip controls the bidirectional converter corresponding to the single battery with the highest electric quantity value to step up to the low-voltage bus, and controls the bidirectional converter corresponding to the single battery with the lowest electric quantity value to step down to the single battery. The storage battery equalization device and the equalization method solve the problems that the existing active equalization circuit is complex, the cost is high, the high-voltage side of the unidirectional converter is prone to damage, and the unidirectional converter occupies a large volume.

This invention provides a method, apparatus, system, and aircraft for controlling parallel charging of multiple battery packs, relating to the field of battery management technology. In the hardware access stage, based on the initial voltage sorting results, the invention dynamically calculates and sets a pre-charge current threshold by real-time monitoring of the voltage difference and the real-time internal resistance of the battery packs. This precisely limits the circulating current instantaneously generated by the contactor in the closed charging circuit to a safe range, achieving the function of the voltage equalization module in suppressing inrush current and voltage balancing without additional hardware. In the software management stage, the total SOC value is calculated based on at least one of the health status and rated capacity of each battery pack. This ensures the feedback accuracy of the total SOC value even without a voltage equalization module, and dynamically distributes the current according to the health status of each battery pack, achieving the balancing effect of the voltage equalization module at the logical level. Therefore, this invention achieves safe and efficient parallel charging of multiple battery packs without using a voltage equalization module.

The present application discloses an AC power surge protector, which relates to the technical field of power surge protection, and includes a cylinder body, a cover body, an electrode column and a varistor group, wherein the electrode column is coated with a first insulator, a second insulator is arranged in the cylinder body, a positioning groove for placing the varistor group is arranged in the second insulator, the varistor group includes a plurality of varistors stacked in sequence, and each varistor is coaxially placed in the positioning groove, the surface of the varistor is provided with an aluminum sand surface, and a sand pit is arranged on the aluminum sand surface, an aluminum film is arranged between two adjacent varistors, and a clamping structure for clamping the electrode column against the varistor group is arranged on the cylinder body. A gas discharge tube is also installed in the cylinder body, and the gas discharge tube is respectively connected to the varistor group and the cylinder body, and a grounding column is arranged at the bottom end of the cylinder body. The present application ensures that each varistor can evenly share the voltage and current, thereby extending the service life of the AC power surge protector.

The invention discloses a converter port voltage balancing method of a full-direct-current system, the voltage balancing method is applied to the full-direct-current system, and the system comprises a fan, an AC / DC converter, a DC / DC converter, a DC / AC converter and an alternating-current power grid. The voltage balancing method comprises the following steps: carrying out VOC voltage stabilization control on the machine side DC voltage of the AC / DC converter based on a preset AC / DC converter model; performing voltage control on the DC / DC converter by adopting a control strategy of outer ring port voltage and inner ring output current, so that the output port voltage of the DC / DC converter is balanced; and carrying out system transmission power stable control on the DC / AC converter according to a preset inverter control strategy, wherein the preset inverter control strategy comprises a network following type control strategy and a network constructing type control strategy. The technical problems that an existing full-direct-current system is difficult to achieve voltage balance of a convergence network direct-current port, and the absorption pressure of an alternating-current grid-connected point cannot be relieved can be solved.

The utility model provides an energy-saving structure of an elevator, which can solve the problem of voltage imbalance, improve the operation efficiency of the elevator and save electric energy. Comprising a super capacitor bank, a plurality of single voltage balancing modules, a resistor R1, an MOS tube Q1 and a controller, the super capacitor bank comprises super capacitors C1-Cn, the super capacitors C1-Cn are sequentially connected in series, the number of the single voltage balancing modules corresponds to the number of the super capacitors, the single voltage balancing modules adopt bidirectional DCDC converters, and the single voltage balancing modules are connected with the MOS tube Q1. The output ends of the single voltage balancing modules are sequentially and correspondingly connected to the two ends of the super capacitors C1-Cn, the input ends of the multiple single voltage balancing modules are connected in parallel and then connected to the input end IN1 of the controller, one end of the resistor R1 is connected with one end of the super capacitor bank and the controller, the other end of the resistor R1 is connected with the controller and the drain electrode of the MOS tube Q1, and the other end of the resistor R1 is connected with the drain electrode of the MOS tube Q1. The grid electrode of the MOS tube Q1 is connected to the controller, the source electrode of the MOS tube Q1 is connected to the positive electrode end of the direct current bus, and the other end of the super capacitor bank is connected to the negative electrode end of the direct current bus.