6127 results about "Terminal voltage" patented technology

A battery capacity measuring device in accordance with the present invention has a fully-charged state detector (80e), a detected current integrator (80a), a divider (80b), and a corrector (80c) incorporated in a microcomputer (80). The fully-charged state detector detects that a battery is fully charged. The detected current integrator integrates current values that are detected by a current sensor during a period from the instant the battery is fully charged to the instant it is fully charged next. The divider divides the integrated value of detected current values by the length of the period. The corrector corrects a detected current using the quotient provided by the divider as an offset. Furthermore, a remaining battery capacity calculating system comprises a voltage detecting unit (50), a current detecting unit (40), an index calculating unit, a control unit, and a calculating unit. The voltage detecting unit detects the voltage at the terminals of a battery. The current detecting unit detects a current flowing through the battery. The index calculating unit calculates the index of polarization in the battery according to the detected current. The control unit controls the output voltage of an alternator so that the index of polarization will remain within a predetermined range which permits limitation of the effect of polarization on the charged state of the battery. When the index of polarization remains within the predetermined range, the calculating unit calculates the remaining capacity of the battery according to the terminal voltage of the battery, that is, the open-circuit voltage of the battery.

An apparatus for creating pulse magnetic stimulation, having a modulation function, according to the present invention, comprises: a driving voltage supplying section for converting AC voltage input from a voltage source into DC voltage having a predetermined magnitude; a capacitor section for accumulating electric charge in accordance with the DC voltage; an input switch section for controlling the accumulation of electric charge in the capacitor section; a coil for generating magnetic flux in accordance with current generated by both-end voltage corresponding to the electric charge accumulated in the capacitor section; an output switch section for controlling discharge of the electric charge accumulated in the capacitor section through the coil; and a shunt switch section for lowering magnetic energy stored in the coil and voltage stored in the capacitor section into a ground level to obtain a pulse magnetic field. In this pulse-magnetic-stimulation creating apparatus having a modulation function according to the present invention, it is possible to efficiently transfer energy on the basis of current compliance of a patient and impedance of biologic tissue for therapeutic applications.

A method of estimating a state of charge (SOC) and a state of health (SOH) of an electrochemical cell (EC) includes modeling the EC with a linear equation, measuring a terminal current of the EC, measuring a terminal voltage of the EC and measuring a temperature of the EC. The linear equation is processed through a time-varying state and parameter estimator based on the terminal current, the terminal voltage and the temperature to determine states and parameters of the EC.

A battery management system using a measurement model modeling a battery, and estimating a SOC (state-of-charge) of the battery, and a battery driving method thereof. The battery management system is constructed with a sensor, a predictor, a data rejection unit, and a measurement unit. The sensor senses a charging and discharging current flowing through the battery, a temperature of the battery, a terminal voltage of the battery. The predictor counts the charging and discharging current, and estimates the state-of-charge of the battery. The data rejection unit generates information associated with an error generated from the measurement model, as a function of at least one of the battery temperature, the charging and discharging current, the state-of-charge, and a dynamic of the charging and discharging current. The measurement unit corrects the estimated state-of-charge of the battery, using the measurement model and the information associated with the error.

A state-of-charge (SOC) estimating device and method for a secondary battery that estimates the SOC of the battery with high precision when variation takes place in the parameters of the battery model, even if the input current is constant. A first SOC estimating part estimates the open-circuit voltage by estimating the battery parameters en bloc using an adaptive digital filter computing treatment from the measurement values of the current and the terminal voltage and computes a first estimated SOC of the secondary battery from the open-circuit voltage and a predetermined relationship between the open-circuit voltage and the SOC. A second SOC estimating part computes a second estimated SOC by means of current-integration. State-of-charge estimated value-selecting part selects the second SOC value as when the current is constant and otherwise selects the first SOC value.

A reverse current stopping circuit includes a synchronous rectification device, a comparator for detecting a reverse current of an inductor, the synchronous rectification device being turned off when the reverse current is detected by the comparator, a reverse current detector circuit for detecting a switching terminal voltage after the synchronous rectification device is turned off, thereby determining a value of the inductor current to decide whether the inductor current is flowing in a reverse direction or a forward direction, and a memory unit for receiving a predetermined output signal from the reverse current detector circuit in accordance with a result of the reverse current detector circuit, and outputting a control signal for an offset voltage in accordance with the predetermined output signal. The offset voltage is changed in accordance with the control signal so as to adjust the inductor current to zero when the synchronous rectification device is turned off.

A battery management system that estimates an internal impedance of a battery, a method of driving the same, a device that estimates an internal impedance of a battery, and a method of estimating the internal impedance of a battery. A method of driving a battery management system that estimates the internal impedance of a battery including a plurality of cells includes generating a battery equivalent model of the battery, receiving a terminal voltage signal and a charge and discharge current signal of the battery, and generating a first discrete signal corresponding to the terminal voltage signal of the battery and a second discrete signal corresponding to the charge and discharge current signal of the battery, and filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery. The device that estimates an internal impedance of a battery filters the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery.