Abstract: The present invention discloses a reference circuit with temperature compensation, which is characterized in that a current output circuit is designed to receive a reference voltage from a bias voltage generation circuit, generate two reference currents with opposite temperature variation characteristics, and then merge them into a compensated current with temperature compensation. In addition, a voltage output circuit is designed to receive a reference voltage from a bias voltage generation circuit, which includes several field-effect transistors operating in saturation regions, and a precision voltage increases with threshold voltages of the field-effect transistors to compensate for the temperature variation. Resistors can be incorporated or sizes of the field effect transistors can be changed to adjust the output current, output voltage or the temperature variation characteristics.

Abstract: A multi-mode operation method for a capacitive touch panel is disclosed. The panel has a plurality of touch cells, and detection values of the plurality of touch cells are obtained by mutual capacitance scan. A normal mode and an insulation mode are provided for situations in which the panel is touched by a finger and a glove, respectively. An insulation determination condition is established for automatically determining glove touch to make the panel enter the insulation mode. In the insulation mode, the criteria for determining touch events can be automatically adjusted, or the detection values around the cells touched can be processed to accurately determine the touch effect when the panel is touched by a glove. In the insulation mode, a condition for determining to leave the insulation mode is also established, so that the touch panel can be smoothly switched between the normal mode and the insulation mode.

Abstract: Disclosed is a capacitive touch panel having a circuitous conductor pattern structure. The capacitive touch panel contains a number of first axial conductor assemblies and a number of second axial conductor assemblies, wherein each second axial conductor assembly includes a number of second axial conductor cells which are composed of a number of bar shape figures with accordion shape or wave shape edges. Electrical fields and induced capacitors are generated between adjacent axial conductor assemblies with different directions when giving control signals. Then the touched position is detected. Circuitous conductor pattern increases the region of the first axial conductor assembly and the inducing range of electrical field, thus the amount of the axial conductor assemblies and conduction lines can be reduced.

Abstract: A power transfer circuit for achieving power transfer between stacked rechargeable battery cells is disclosed. The power transfer circuit includes an inductor, a first switch, a second switch and a controller. A loop of the rechargeable battery cell having higher power and the inductor is conducted so that the inductor stores power until the current flowing through the inductor meets the cutoff amount. Then, a loop of the rechargeable battery cell having lower power and the inductor is conducted so that the inductor releases the power saved in the inductor to the rechargeable battery cell having lower power until current flowing through the inductor changes direction. Therefore, balance between the rechargeable battery cells can be achieved.

Abstract: Disclosed is a feed forward sigma-delta analog to digital conversion (ADC) modulator. The disclosed structure combines feedback circuit, adder circuit and quantization circuit, and has advantages of high stability, without active circuit, and using successive approximation register (SAR) control circuit, thus realizes the function of multi-bit quantization by using only one comparator.

Abstract: A master-slave type battery management system for accurate capacity gauge of battery packs is disclosed. It includes several battery management units linked to each other via a communication line. Each battery management unit is linked to a specified rechargeable battery set to manage the specified rechargeable battery set, detect a physical measurement data from the specified rechargeable battery set and calculates battery set capacity related value based on the physical measurement data. Each battery management unit has a unique battery ID. By assigning a battery management unit having a specified battery ID as a master battery management unit, the rest battery management units become slave battery management units. Each slave battery management unit sends the physical measurement data and battery set capacity related value to the master battery management unit via the communication line. The master battery management unit is in charge of calculating related values and transmitting them.

Abstract: A system of communication between stacked integrated circuits powered by different voltage supply levels in a multiple cell-stacked battery pack is disclosed. The system includes a number of battery cells and a number of integrated circuits. Each integrated circuit includes a battery detecting unit, a data transceiving unit and a power acquiring unit. Since the data transceiving unit transmits signals by toggling voltage level, current flow which causes higher power consumption can be avoided. Meanwhile, the system of communication can therefore be applied to many internal communicating protocols.

Abstract: A method of searching for full charge capacity of stacked battery cells in a rechargeable battery pack and a battery management system based on the method are disclosed. The method includes the steps of: predefining an end-of-discharge condition as a ratio of change of open-circuit cell voltage to change of state of charge; providing a full charge capacity for a rechargeable battery pack assembled of several stacked battery cells; charging the rechargeable battery pack until it is fully; discharging the rechargeable battery pack; measuring current values and open-circuit cell voltages periodically; processing coulomb counting based on the measured current values and zeroing a sum of coulomb counting values when a new discharging cycle begins; estimating state of charge during discharging periodically; calculating a running ratio; and updating the full charge capacity by the current sum of the coulomb counting values when the running ratio is equal to or greater than the end-of-discharge condition.

Abstract: A cell voltage monitoring and self-calibrating device for a plurality of battery cells connected in series is disclosed. The device includes a first voltage measurement unit, a second voltage measurement unit, a first compensation unit, a second compensation unit and a calculating unit. It can measure voltages of each cell in a battery pack which provides power to electric equipment and calibrates itself during measurement.

Abstract: A compensating circuit which has a programmable capacitance array for measuring AC voltage is disclosed in the present invention. The compensating circuit includes a pair of first leads for linking to an AC circuit; a variable capacitor, electrically linked to the first leads, for providing different capacitance value according to a programmable capacitance array; and a control unit, electrically linked to the first leads, for changing the capacitance value of the variable capacitor as one capacitance of the programmable capacitance array according to an external instruction. Since the capacitance of the compensating circuit is changeable, and AC voltage meter designed with the compensating circuit is able to measure voltage in wider range of frequency.

Abstract: A rechargeable battery protection device has a voltage detector, a logic circuit, an output stage, a first switch, a second switch and inverter circuits. The device turns on a charger to charge a rechargeable battery or turns off the charger not to charge the rechargeable battery depending on the purpose for battery protection.

Abstract: A temperature measuring system and a measuring method using the same are disclosed. The method for measuring an integrated circuit temperature includes the steps of: detecting a first difference in output voltage values between a first transistor and a second transistor by providing a first current through the first transistor and a second current through the second transistor; detecting a second difference in output voltage values between the first transistor and the second transistor by providing the second current through the first transistor and the first current through the second transistor; obtaining an average value by averaging the first difference and the second difference; and determining the temperature by multiplying the average value with a predetermined value.

Abstract: A first gain stage and a second gain stage having different gains are linked in cascade to construct a wide range and high resolution programmable gain amplifier. The second gain stage can be used only for low gain and low power consumption. Furthermore, two pairs of chopper circuits are used to shift flicker noise when the programmable gain amplifier is operated.