35results about How to "Reduce charge and discharge current" patented technology

The invention provides an active equalization system and method of power battery packs of an electric bus. The system comprises a capacitor battery management and monitoring module, a motor control module, an equalization control module and a capacitor battery circuit module. The capacitor battery circuit module comprises a main circuit switch, a first branch and a plurality of second branches connected in parallel. The first branch and the second branches are connected with the main circuit switch in series after being connected in parallel. The first branch is formed by connecting a super-capacitor pack and a branch switch in series. Each second branch is formed by connecting one power battery pack and a branch switch in series. The invention further provides the equalization method of the active equalization system of the power battery packs of the electric bus. The active equalization system is simple in overall structure and easy to obtain, the utilization rate of the power battery packs is increased, fault cost and maintenance cost caused by overcharge or over-discharge are reduced, and the active equalization system is suitable for being applied and popularized on a large scale.

The invention belongs to the field of electrochemical energy storage and particularly relates to a group balanced control device and method for an energy-storage liquid metal battery. The group balanced control device for the energy-storage liquid metal battery comprises N serially connected liquid metal battery units, a voltage detection module, a balanced control module and a balanced circuit module; multiple liquid metal battery monomers with higher consistency are screened and are firstly connected in series and later connected in parallel to form one battery unit, and the battery units are placed in the same high-temperature incubator. The invention further discloses a group charge and discharge balanced control method of the energy-storage liquid metal battery. By means of the control device and the control method, the defect that initiative balanced control is difficult to implement due to the fact that a voltage platform of the liquid metal battery is low and wide can be overcome, the control method and the control device can meet the requirement for the high-temperature environment during group use of the liquid metal battery, and the complexity of the balanced control device and control method is reduced, so that the energy storage use demands of the liquid metal battery are met.

The invention discloses a low power consumption successive approximation type analog-digital converter and a converting method of the low power consumption successive approximation type analog-digital converter. A switched capacitor network comprises a capacitor pair which is one less in number when compared with output binary coding, timing sequence of switches is arranged anew, common mode electrical level Vcm is introduced during the comparison process, compensation capacitor in traditional successive approximation type analog-digital converter switched capacitor networks, and the effect of achieving N bit resolution ratio of N-1 capacitor is achieved. Compared with traditional successive approximation type analog-digital converters, two capacitor pairs of a highest order and a second highest order are cut down, and accordingly the whole total capacitance is reduced by 75%. Along with reduction of capacitance, charging and discharging target is correspondingly reduced, accordingly overall power consumption is lowered, chip area is reduced, and economic benefit is improved. During conversion process, compared with traditional structures, common mode voltage change quantity of an input end of a comparator is little in common mode shaking only.

The invention belongs to the technical field of electricity, relates to charging equipment and method, in particular to an energy feed type variable-constant-current and positive-negative-pulse fast charging device and method. The fast charging device is characterized in that alternating currents sequentially pass an air switch, an EMI filter circuit, a full-bridge rectifying and filter circuit and power factor correction circuit, the power factor correction circuit is respectively connected with a controller and a first voltage detecting circuit, the controller is respectively connected with a comparison and conditioning circuit and a first auxiliary power supply, a storage battery charging and discharging management main circuit is respectively connected with the first voltage detecting circuit and a second voltage detecting circuit, a current transformer is respectively connected with an output filter capacitor, the storage battery and a bias circuit, a second optical coupler is respectively connected with the second voltage detecting circuit and a single-chip microcomputer control circuit, the single-chip microcomputer control circuit is respectively connected with a second auxiliary power supply, a display circuit, a drive circuit and the bias circuit, and the display circuit is connected with the second auxiliary power supply. The energy feed type variable-constant-current and positive-negative-pulse fast charging device is simple in structure, convenient to operate, short in charging time and high in electric energy utilization rate.

The invention discloses a method for distributing power of a compound power supply system of an electric vehicle, and the invention makes up for the deficiency of a single fuzzy controller. According to the battery current target difference ΔI bat and the initial distribution coefficient of battery output power α 0 The second-level fuzzy controller as the input can correct the initial distribution coefficient of the battery output power of the first-level fuzzy controller in real time according to the different driving conditions of the electric vehicle, and achieve the optimal distribution of power between the battery and the super capacitor As a result, the charging and discharging current of the battery is reduced.

The present invention provides a clutch coupling coordination control method for a hybrid hybrid power system, comprising step 10, before the clutch is coupled, using the engine to control the rotational speed, and the ISG motor to control the torque; and step 20, judging the absolute value of the rotational speed difference between the ISG motor and the drive motor Whether it is less than or equal to n0, if so, switch to using the engine to control the torque, and the ISG motor to control the speed; if not, return to step 10; step 30, judge whether the absolute value of the speed difference between the ISG motor and the driving motor is less than or equal to n1 and the duration is T1 , yes, then give the clutch engagement command; no, return to step 20; step 40, judge whether the absolute value of the speed difference between the ISG motor and the driving motor is less than or equal to n2 and last for T2, if yes, the clutch engagement is completed; no, Then return to step 30. The invention can speed up the speed regulation process before the clutch is combined, reduce the charge and discharge current of the battery during the speed regulation process, and prevent the battery from heating up too fast or even from overheating.

A booster circuit includes: first to M-th power supply lines (VL-1 to VL-M) (M is an integer greater than four); first to (M-2)th boost capacitors (Cu1 to Cu(M-2)), the j-th boost capacitor (1<=j<=M-2, j is an integer) being connected between the j-th power supply line and the (j+1)th power supply line in a first period, and connected between the (j+1)th power supply line and the (j+2)th power supply line in a second period which is subsequent to the first period; and first to (M-3)th stabilization capacitors (Cs1 to Cs(M-3)), the k-th stabilization capacitor (1<=k<=M-3, k is an integer) being connected between the (k+1)th power supply line and the (k+2)th power supply line, and storing an electric charge discharged from the k-th boost capacitor in the second period.

A boost clock generation circuit (500) including: a first switch circuit (502) connected between a first power supply line and a first clock output line to which the first boost clock signal is output; a second switch circuit (504) connected between a second power supply line and the first clock output line; a third switch circuit (506) connected between a third power supply line and a second clock output line to which the second boost clock signal is output; and a fourth switch circuit (508) connected between a fourth power supply line and the second clock output line. One of the first and second switch circuits is exclusively turned ON, and one of the third and fourth switch circuits is exclusively turned ON. The level of current drive capability of the first switch circuit differs from the level of current drive capability of the third switch circuit; and the level of current drive capability of the second switch circuit differs from the level of current drive capability of the fourth switch circuit.

The invention discloses a method for realizing parallel connection of two sets of vehicle-mounted battery systems. A general positive relay and the like are included; the general positive relay, a battery management system, a first parallel relay, a parallel-connection protection relay and a second parallel relay are connected in parallel; the parallel-connection protection relay is connected with a pre-charging resistor in series; the battery management system is connected with a 24V power supply in series; and a first battery system and a second battery system are connected in parallel for supplying power for at least one electronic load. By adoption of the method, the problem existing in improvement of charging and discharging rate when the conditions of energy density, energy requirement and the like are not changed in the power supply system of the existing power automobile is solved; compared with the conventional design, the charging and discharging current can be effectively lowered; damage to a high-voltage device caused by heating due to a high current is effectively reduced, heating in the connecting place of battery modules is lowered, and the long-standing problem existing in module connecting design is relieved; the problem of ring current impact of parallel instantaneous high current in parallel connection use is solved; and the battery system is more reliable, and the service life of electrical devices can be prolonged.

Embodiments of the invention provide a power control circuit for memories. The power control circuit comprises a control port and a logic circuit, wherein the control port is used for controlling an input signal of the logic circuit; the logic circuit is used for outputting a high electric level or a low electric level according to the input signal; and the control port is furthermore used for starting ground control when logic circuit outputs the high electric level, and starting power control when the logic circuit outputs the low electric level. Visibly, the control port is capable of controlling internal signals of the logic circuit, and when a power management mode is started, the circuit can be managed according to states of internal nodes, so that the charging / discharging capacitance can be decreased while the aim of decreasing electric leakage is achieved, thereby decreasing the switching time, between a normal working mode and the power management mode, of systems, and decreasing the charging / discharging current during the switching.

A first circuit is connected with the first and second power supply lines and a boost power supply line, and outputs a voltage obtained by multiplying the voltage between the first and second power supply lines M times (M is a positive integer), between the first power supply line and the boost power supply line. A second circuit is connected with the first power supply line, the boost power supply line and an output power supply line, and includes a plurality of switching elements. The second circuit outputs a voltage obtained by multiplying the voltage generated in the first circuit N times (M>N, M and N is a positive integer), between the first power supply line and the output power supply line by a charge-pump operation using a capacitor connected between first and second terminals outside and the switching element connected with the second terminal.

The invention discloses a differential input successive approximation type analog-digital converter. A switched-capacitor network comprises capacitor pairs of which the quantity is identical with that of output binary code digits; a compensation capacitor in a traditional SAR (Successive Approximation) type ADC (Analog to Digital Converter) switched-capacitor network is omitted by brand-new time sequence arrangement of the switch, so that the capacitance at highest order is reduced by 50 percent and the whole total capacitor is also reduced by 50 percent. Charge / discharge current is correspondingly reduced along with the reduction of the capacitance, and thus the integral power consumption is reduced. Meanwhile, the area of a chip is reduced and economic benefits are increased. In the converting process, common-mode voltage variable quantity at the input end of a comparator is compared with that of a traditional structure, N is a digit of the ADC and Vref is equal to the difference of VH and VL.

The present invention provides an active equalization system and method for a power battery pack of an electric bus. The system includes a capacitor battery management and monitoring module, a motor control module, an equalization control module, and a capacitor battery loop module; the capacitor battery loop module includes a trunk switch, a second A branch and a plurality of second branches connected in parallel, the first branch is connected in parallel with the plurality of second branches and then connected in series with the trunk switch, and the first branch is composed of a supercapacitor group and a branch switch in series , each second branch is composed of a power battery pack and a branch switch in series. The invention also provides an equalization method for the active equalization system of the power battery pack of the electric passenger car. The invention has a simple overall structure, is easy to implement, improves the utilization rate of the power battery pack, reduces failures and maintenance costs caused by overcharging or overdischarging, and is suitable for large-scale popularization and application.