467 results about "Pulse charge" patented technology

Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.

A method and apparatus for fast charging of batteries such as lead acid batteries is provided. A repeatedly pulsed current is applied to the battery to enable a determined resistance free maximum pulsed voltage to be reached where the determined resistance free maximum pulsed voltage is below that at which unacceptable gassing will occur. The determined resistance free maximum pulsed voltage is above that of a known average resistance free pulsed voltage for the battery type. When the determined maximum pulsed voltage is reached the pulsed current is continued to be applied to maintain the resistance free maximum pulsed voltage at approximately the determined resistance free maximum pulsed voltage by at least one of: (I) reducing the amplitude of the pulsed charging current, (II) increasing the OFF-time of pulses of the pulsed charging current, (III) decreasing the ON-time of pulses of the pulsed charging current, (IV) a combination of any two or more of (I), (II) or (III). In addition, the present invention may employ a combination of stages to charge the battery. Alternatively or in combination, the system may use a repeatedly pulsed charging current or a repeatedly pulsed charge voltage to control and adjust the charging of the battery.

The present invention discloses a lead-acid battery charging method, multiple charging modes are set. In the normal mode, according to battery capacity, charge batteries in multi-stages. The corresponding charger is disclosed which comprising of: high-power switch power supply, switch circuit, impulse charge-discharge circuit, voltage and current detecting circuit, charge mode switch module and micro-processor. Comparing to present technique, the present invention sets multiple charge modes, charges in multi-stages, meets the charge requirement in all different conditions furthest, and benefits for prolonging the service life of lead-acid battery. The pulse charge-discharge circuit of present invention realizes discharge energy circumfluence by capacitance serial-parallel conversion, uses high inductance converting steep wave pulse to ladder-type pulse, comparing to traditional pulse charge-discharge circuit using big resistance charge and discharge, reduces the energy loss and loss of rapid pulse to lead-acid battery electrode slices.

The inventions herein relate to devices and methods to impart charge to lithium ion battery cells. Still further, the present invention incorporates to pulse charging methods and systems related thereto that provide improvements in charging speed, efficiency and additional benefits.

The battery pack charging method charges a battery pack, which is a plurality of lithium ion rechargeable batteries connected in series, to full charge by constant current and constant voltage charging. Constant current charging is performed until total voltage reaches a prescribed total voltage. Subsequently, constant current charging is switched to constant voltage charging until full charge is reached. In addition, the voltage of each battery being charged is detected. When the voltage of any battery exceeds a first specified voltage, charging is switched to pulse charging.

The invention relates to an accumulator charging system, which comprises a three-phase alternating current power supply (10), an AC/DC convertor (20), a super capacitor group (30), a DC/DC bidirectional convertor (40) and an accumulator group (50), wherein the super capacitor group (30) is connected with the DC/DC bidirectional convertor (40) through a direct current bus (11). The DC/DC bidirectional convertor (40) is connected with the accumulator group (50)through an accumulator charging interface (102). The three-phase alternating current power supply (10) is connected with the AC/DC convertor (20) through an electric interface (101). The accumulator charging system can achieve conventional charging mode which comprises constant current, constant voltage and the like through controlling the DC/DC bidirectional convertor (40), can further generate positive and negative current impulse whose amplitude and width can be adjusted, achieves pulse charge to the accumulator group (50), provides particle or full electric energy by the super capacitor group (30) in a positive-going pulse period, absorbs electricity in a negative-going pulse period, lowers the charging grade of a charging power supply, and improves the energy utilization efficiency of the accumulator charging system.

The invention discloses a method for generating and controlling charging and discharging pulses of a pulse charging device. The invention belongs to a pulse charging technology based on a switch power supply. In order to innovate the conventional mode that a pulse voltage is rectified and filtered into a direct current voltage and the direct current voltage is then converted into a pulse in outputting of the charging pulse by adopting the pulse charging technology of a foreign special charging control integrated circuit, and to solve the problem that a switch transformer is adopted to output pulse charging and to generate the discharging pulse simultaneously, a method for adopting a secondary winding of the switch transformer to output the pulse charging and introduce outputting of the charging pulse to trigger a single steady-state circuit which is formed on the basis of a time-base circuit to convert into outputting of the discharge pulse which is alternated simultaneously with the charging pulse in a temporary steady state is provided, and the method for automatically regulating a control end voltage of the time-base circuit to control the discharge pulse and improving the conventional charging control circuit and a voltage stabilizing circuit to control the charging pulse is provided. The method provided by the invention is applied to charging of a lead acid battery, and charging effects on other batteries are required for further test.

A driver for driving a driving element includes: a signal source, for providing a square signal; a first modulation circuit, for providing on-pulses and off-pulses according to edges of the square signal; a transformer for coupling output signals of the first modulation circuit to a secondary winding of the transformer to form coupled signals; a second modulation circuit for providing first operating pulses according to coupled on-pulses of the coupled signals, and providing second operating pulses according to coupled off-pulses of the coupled signals; a switch device for turning off the switch device according to the first operating pulses and turning on the switch device according to the second operating pulses, and when the switch device is turned off, coupled on-pulses charge an equivalent capacitor of the driving element to a first driving potential to turn on the driving element, and when the switch device is turned off, the equivalent capacitor discharges to a second driving potential to turn off the driving element, and the width of the on-pulses is less than 1000 ns.

There is provided a non-contact power transfer apparatus performing non-contact power transfer from a power transmission coil L1 to a power reception coil L2 using electromagnetic induction. The non-contact power transfer apparatus has: a power transmission unit 10 including the power transmission coil L1, a power transmission circuit 1, a current detection circuit 3, unit detection means 4 and a first microcomputer 2 with a control circuit for controlling each of the circuits; and a power reception unit 30 including the power reception coil L2, a rectification smoothing circuit 31, a series regulator 34, a charge battery unit 40 with a rechargeable battery, a switching element 33 for pulse-charging and a second microcomputer 32 with a control circuit for controlling the series regulator and the switching element.

With this structure, the non-contact power transmission apparatus can be safe, reduce unnecessary power loss and prevent heat generation even when a foreign matter like metal is placed close thereto.

A controller in a charging control system controls a charger to heat a battery at a low temperature by pulse charging and discharging up to a desired temperature and then moves to a normal charging mode. The controller calculates an ion concentration of an active material at electrode portions of the battery on the basis of the temperature data and the electric current data obtained, switch the pulse charging and discharging between a charging mode and a discharging mode on the basis of a pulse width when the ion concentration reaches a threshold.

A method and an apparatus for charging a lithium-ion based rechargeable battery in a short time is provided. A terminal voltage of the rechargeable battery is compared with a predetermined first set voltage V1 while charging the rechargeable battery with a constant current; pulse charging is performed in which charging is halted after the rechargeable battery is charged with the constant current only during a predetermined first set time T1 when the terminal voltage becomes the first set voltage V1 or more; both an elapsed time An from the start of the halt and a terminal voltage Bn at the elapsed time An are measured a plurality of times during the halt of charging in the pulse charging and the terminal voltage Bn is compared with a predetermined second set voltage V2; whether or not the terminal voltage drops to the second set voltage V2 or less is presumed based on measurement results of those elapsed time An and terminal voltage Bn in the case where the terminal voltage Bn is higher than the second set voltage V2 when the elapsed time An reaches a predetermined second set time T2; both the pulse charging and the presumption of the terminal voltage are repeated when presumed that the terminal voltage drops to the second set voltage V2 or less; and charging is ended when presumed that the terminal voltage does not drop to the second set voltage V2 or less.

A radio-frequency surgical implement detection system detects surgical implements in a surgical wound during and at the completion of a surgical procedure. Surgical implements, including surgical sponges or laparotomy pads, gauze pads and metallic surgical instruments, are individually attached to a non battery-powered, encapsulated radio-frequency marker. The marker comprises an integrated chip having a burnt-in memory code, which is broadcast through an antenna using a modulated carrier frequency. The code is received by an interrogating antenna of a detector. The interrogating antenna provides a power pulse, which is received by the antenna of the radio-frequency marker. The power pulse charges a capacitor, which proves power for the read function, carrier frequency modulation function and broadcast function of the integrated chip, permitting each marker-containing implement to be specifically identified.

The invention discloses a device for managing energy of lithium-ion power batteries of electric vehicles and provides a system for managing energy of lithium-ion power batteries of electric vehicles. The system is installed on the vehicle, can monitor the lithium-ion power batteries in real time and can properly control charge and discharge according to the charge and discharge requirements of the lithium-ion power batteries. In the invention, each integrated lithium-ion power battery is controlled by a special control chip, the trickle precharge, quick constant-current charge, constant-voltage charge and supplementary pulse charge occluded stage methods are adopted in the charge process, and equalization discharge control is adopted in the discharge process, which is beneficial to stability of the output voltage and ensures good running smoothness of the electric vehicles. The special control chips have unique address codes and a microprocessor of the system can read and write the information of the special chips. Equalization of charge and discharge processes of each group of lithium-ion power batteries is achieved according to the acquired battery voltage, charge and discharge current and voltage variation of energy transmission control modules of the temperature information control system.

A battery-charging device, having a maximum power point tracking (MPPT) function, for a stand-alone generator system includes a DC/DC power converter and a control circuit used to control the DC/DC power converter. The method applied in the device includes: performing a MPPT function to supply a continuous current when electric power generated from the electrical power source of the stand-alone generator system is low; operating a pulse charging function and continuing the MPPT function when the electric power generated from the electrical power source of the stand-alone generator system is high and not greater than the summation of load power and a maximum charging power of the pulse charging method for the battery; terminating the MPPT function while the electric power is greater than the summation of load power and the maximum charging power of the pulse charging method for the battery; operating a constant-voltage charging mode when the battery voltage is greater than a predetermined constant charging voltage.

The invention discloses a positive and negative pulse charging converter for a storage battery. A bilateral full-bridge LLC (Logical Link Control) resonant circuit is taken as a main charging topology, so that the defect that the implementation of negative pulses is limited by application occasions and power levels is overcome while soft switching is realized. Meanwhile, a power main circuit comprises a bridge type uncontrollable rectifying circuit and a bilateral full-bridge LLC resonant circuit. During discharging of the storage battery, the bus capacitive voltage on a high-voltage side, namely, a rectifying side is raised. During initial charging at a positive pulse charging stage, open-loop control is adopted, namely, the duty ratios and frequencies of switching tubes Q1-Q4 are kept the same as the duty ratios and frequencies in a previous charging period. Since the bus capacitive voltage is high, the charging current is increased correspondingly and decreased gradually till a charging controller works normally, and the charging current is stable. In this way, sharp pulse charging current is formed in order to enhance the repair, namely, depolarization effect of the storage battery. Moreover, both the charging current and discharging current of the storage battery are under high-frequency pulsation, and an LC filter filters higher harmonics of the charging current while smoothening the high-frequency pulsation.

The invention provides a variable-current charging method of a storage battery. The method comprises a constant-flow charging stage, a pulse quick charging stage and an additional charging stage. In the constant-flow charging stage, the storage battery is subjected to constant-flow charging by first charging current until a voltage value of the storage battery reaches a first preset voltage value; in the pulse quick charging stage, the storage battery is subjected to cyclic pulse quick charging in a manner of alternating positive pulse charging and negative pulse charging; when one cyclic pulse quick charging period is ended, a positive pulse current value and a negative pulse current value are reduced; meanwhile, the charging time and the discharging time are shortened; the next cyclic pulse quick charging period is carried out until the positive pulse current value reaches a second charging current value; and in the additional charging stage, the storage battery is subjected to additional charging in a constant-voltage charging manner. Through the variable-current charging method, quickly and efficiently charging a large-capacity storage battery can be achieved; the polarization phenomenon is removed; and the damages to the storage battery are reduced.

The invention discloses a variable constant-current constant-voltage charging method which comprises the following steps: when the voltage of a battery is relatively low, trickle charging is carried out according to information fed back after sampling; when the voltage of the battery rises to a large-current charging set threshold, a large-current constant-current charging mode is adopted, wherein the charging current in the process only can fall gradually, but cannot vary reversely; then, the battery is in a constant-voltage charging stage. The variable constant-current constant-voltage charging method is provided based on analysis of the advantages and the disadvantages of common charging strategies and the charging and discharging characteristics of a lithium titanate battery, integrates the advantages of a constant-current constant-voltage charging method, a pulse charging method, a variable-current intermittent charging method and other charging strategies, and overcomes the defects of the common charging strategies.

The invention discloses an SOC estimation method based on an adaptive double extended Kalman filtering method. The SOC estimation method comprises the following steps: firstly, establishing a second-order RC equivalent circuit model of a lithium battery; then, determining open-circuit voltage and battery equivalent model parameters at different SOC (state of charge) positions of the lithium battery through a pulse charging and discharging experiment; obtaining a function relationship between the open-circuit voltage and the SOC and relationships between other model parameters and different SOCs, the other model parameters including ohmic internal resistance, electrochemical polarization resistance, electrochemical polarization capacitance, concentration difference polarization resistance and concentration difference polarization capacitance values; establishing a state space equation taking the SOC and polarization voltage as state variables and a state space equation taking the ohmicinternal resistance as a state variable; and finally, performing iterative computation to obtain the SOC value of the lithium battery in real time. According to the method, the problem of unknown noise statistical characteristics in the prior art is solved, and meanwhile, the ohmic internal resistance of the battery is estimated by using the Kalman filtering algorithm, so that the model precisionis improved.

The invention relates to a chemical composite method of lithium ion secondary battery, which includes that: a battery is charged under the chemical composite temperature of lithium ion secondary battery; the charging process includes a constant current charging and a pulse charging to the battery; the pulse charging method includes that the battery is charged up in pulse charging process by a constant current; the constant current pulse charging is that the constant current charging is the first and then stop charging, and then constant current charging again, and then stop charging, thus the process can be cycled until the voltage reaches to 3.5 to 4.25 Volts; the constant current pulse charging current is 0.01 to 2C. The capacity of the lithium ion secondary battery fabricated by the battery chemical composite method has a high duration rate, and the battery has a favorable cycling performance.

The inventions herein relate to devices and methods to impart charge to battery cells. Still further, the present invention incorporates to pulse charging methods and systems related thereto that provide improvements in charging speed, efficiency and additional benefits.