13 results about "Charge current" patented technology

A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.

The invention discloses a current control method for a mobile terminal. The current control method for the mobile terminal comprises the following steps: the temperature of the mobile terminal is monitored at preset time intervals; when the temperature of the mobile terminal is detected to be higher than a target temperature, a current reduction value is calculated according to a preset algorithm, and the present charging current is adjusted according to the current reduction value; when the temperature of the mobile terminal is detected to be lower than a differential value between the target temperature and the temperature at a preset interval, the present charging current is adjusted according to a preset current value. The invention further discloses a current control device for the mobile terminal. The balance between the charging current and heat of the mobile terminal can be effectively controlled.

The invention discloses a mobile phone charging management software and a charging management method thereof. The mobile phone charging management software comprises a current detecting module, a current calculating module, an electronic quantity detecting module and a control module. The current detecting module, the current calculating module and the electronic quantity detecting module are all connected with the control module. According to the mobile phone charging management software and the charging management method thereof, multiple charging modes are realized by arranging a target charging current, at the same time, charging on a battery is stopped when the temperature of the battery is too high, the safety degree in the battery charging process is improved, and in addition, the function of preventing over charging is possessed.

The invention relates to a method and a device for preventing a direct-current system of a power transformation and distribution substation from powering off during storage battery maintenance, belonging to the field of direct-current power supplies. The method comprises the following steps of: connecting a storage battery current relay between the anode and the cathode of a storage battery adjacent to the storage battery to be replaced to structure a direct-current bypass loop; making the charging/discharging current of a storage battery pack of the direct-current system circulate in the storage battery to be replaced by using the storage battery current relay; replacing the storage battery to be replaced; and after finishing the maintaining work, removing the electrical connection between the storage battery current relay and the storage battery loop, thereby ensuring that the original circulating loop of the charging current or discharging current of the storage battery pack of the direct-current system of the power transformation and distribution substation is recovered. The method and the device ensure continuous power supply to a secondary loop system in the process of processing the defects of the storage battery, improve maintenance working efficiency, are also convenient for maintainers to timely master the working conditions of the direct-current system, and can be widely used in the overhauling/maintaining field of direct-current power supply devices in an electric transformation and distribution system.

The invention discloses a charging control circuit of a low voltage power supply to a high voltage battery pack based on an adjustable battery pack series structure. The circuit design can perform charging control on each single battery (or single battery pack) via a breakover path for controlling a current, the multiple single batteries can be randomly and dynamically selected according to a voltage value of the low voltage power supply to be connected serially and added into a charging loop, and thus the low voltage power supply charges the high voltage battery pack. The active equalizationcapacity that has the same size with the charging current can be achieved for the single battery (or the single battery pack) that is not added into the serial bus. Via dynamic control, each single battery (or single battery pack) in the battery pack can be fully charged.

The invention relates to an online diagnosis method for a nonlinear decline aging mode of a lithium ion battery. According to the method, only voltage and current information in the battery charging process is adopted, and the aging mode of nonlinear recession of the battery is accurately evaluated by obtaining the evolution track of the average voltage and capacity of the battery in the aging process. The diagnosis method does not need to adopt a specific charging current, is simple and easy to implement, has high reliability, can be directly used on the electric vehicle, and is suitable for online aging mode identification of the power battery of the electric vehicle.

The existing charger has many components, such that the circuit is complicated. The invention provides a simple and practical charger with a simple structure in order to solve the shortcomings in the above background technology. The charger with the simple structure comprises a power supply; a capacitor, a rectifier diode D1 and a battery are sequentially connected in series onto the power supply; a rectifier diode D2 is connected in parallel between the power supply and the capacitor; and an overcharge protection module is connected in parallel onto the battery. According to the charger, the structure is simple, the circuit is a capacitor current limiting-type constant charging circuit, the magnitude of the charging current is determined by the current limiting capacitor C, and the magnitude of the charging current stays unchanged whether the charger is used for charging a single battery or charging a plurality of batteries in series.

The invention provides a car-mounted low-voltage battery charging method. Firstly, a vehicle controller controls the output current of the DC/DC converter to be I0, the output voltage is U0 to chargethe battery with constant current and constant voltage, if the battery temperature is detected to be greater than the battery alert temperature at some point in time, judging whether the battery temperature at the time is smaller than the battery temperature at the previous time, if yes, calculating a difference T between the battery temperature at that time and the battery temperature at the previous time, and the charging current IPID of the battery is calculated by using T and PID algorithm, after that, the vehicle controller controls the output current of the DC/DC converter to change to IPID, and the output voltage remains unchanged at U0 to charge the battery. If it is detected that the battery temperature is higher than the maximum allowable charging temperature of the battery at acertain time, the charging is terminated; otherwise, the battery temperature is cyclically judged, and different currents are used to charge the battery. The method of the invention is simple and feasible, can improve charging efficiency and avoid excessive temperature of the battery.

The invention relates to the technical field of a micro-grid application, and discloses a black-start system and method for a small hydropower station micro-grid. The system comprises a trunk line with a plurality of loads at the tail end, a power grid branch line, an energy storage switching station, an important load power distribution room branch line and an energy storage management system, the tail end of the trunk line is connected to a bus A, the power grid branch line is connected to a bus B, the branch lines in the energy storage switching station are connected to corresponding buses in a 3/2 wiring mode, and the energy storage management system controls on and off of a switch corresponding to each branch line in the energy storage switching station. The invention also correspondingly provides a black-start method based on the system, the method automatically switches the load according to the output of the small hydropower station and the load condition, gradually recovers power supply in a hydropower-load small-capacity alternate start mode, and can prevent the line charging current and the transformer excitation surge current from being too large. Impact on a black-start main power supply is effectively reduced, and the method can be suitable for a micro-grid containing multiple hydropower stations, energy storage and multiple loads.