Abstract: A power supply includes a boost converter, a capacitor, a step-down converter and a control unit. The boost converter, when activated, converts an input voltage into a boost voltage. The capacitor has a bulk voltage which is equal to the boost voltage when the boost converter is activated. The step-down converter converts the boost voltage into a step-down voltage for output. While the boost converter is deactivated, the control unit samples the input voltage and the bulk voltage, calculates an estimated value, and determines a calibration parameter. While the boost converter is activated, the control unit calculates a calibration value for enabling the boost converter to convert the input voltage with reference to the calibration value.

Abstract: A power supply includes a boost converter, a capacitor, a step-down converter and a control unit. The boost converter, when activated, converts an input voltage into a boost voltage. The capacitor has a bulk voltage which is equal to the boost voltage when the boost converter is activated. The step-down converter converts the boost voltage into a step-down voltage for output. While the boost converter is deactivated, the control unit samples the input voltage and the bulk voltage, calculates an estimated value, and determines a calibration parameter. While the boost converter is activated, the control unit calculates a calibration value for enabling the boost converter to convert the input voltage with reference to the calibration value.

Abstract: A control method for implementation in a power supply system includes steps (A), (B), and (C). In step (A), while the power supply system is providing electricity to a load, a control circuit determines, an estimated capacitance value related to an output capacitor. In step (B), while the output capacitor is providing electricity to the load, the control circuit determines an average power value related to the electricity provided by the output capacitor to the load. In step (C), the control circuit determines an estimated hold-up time value related to the power supply system based on a predetermined target voltage value, a predetermined minimum voltage value, the average power value and the estimated capacitance value.

Abstract: A control method for implementation in a power supply system includes steps (A), (B), and (C). In step (A), while the power supply system is providing electricity to a load, a control circuit determines, an estimated capacitance value related to an output capacitor. In step (B), while the output capacitor is providing electricity to the load, the control circuit determines an average power value related to the electricity provided by the output capacitor to the load. In step (C), the control circuit determines an estimated hold-up time value related to the power supply system based on a predetermined target voltage value, a predetermined minimum voltage value, the average power value and the estimated capacitance value.

Abstract: A method for reducing echo includes detecting whether an output sound volume is greater than a threshold value, and setting an input sensitivity from a first designated sensitivity value to a second designated sensitivity value when the output sound volume is detected to be greater than the threshold value. The method further includes detecting whether an interrupt signal is received, determining whether the interrupt signal is triggered by detecting that the output sound volume is greater than the threshold value when receiving the interrupt signal, detecting whether the input sensitivity is the second designated sensitivity value when determining that the interrupt signal is triggered by detecting that the output sound volume is greater than the threshold value, and setting the input sensitivity as the second designated sensitivity value when detecting that the input sensitivity is not the second designated sensitivity value.

Abstract: A vehicle key system is provided. The vehicle key system comprises a vehicle computer system for a vehicle and a monolithic key structure. The monolithic key structure comprises a key portion coupled to the vehicle and a body portion electrically coupled to the vehicle computer system. The body portion comprises an image capturing unit capturing a biological feature and an image transmitting unit electrically coupled to the image capturing unit for transmitting the captured biological feature to the vehicle computer system.

Abstract: A method for receiving alarm warnings with a mobile communication device, comprising the steps of: storing a district-warning radio frequency contrast table in the mobile communication device, wherein the district-warning radio frequency contrast table records a relationship between a plurality of districts and a plurality of warning radio frequencies for broadcasting the audio warning messages corresponding to one of the plurality of districts; finding a first warning radio frequency corresponding to the first district of a user location in the district-warning radio frequency contrast table, wherein the user carries the mobile communication device, the first district is one of the plurality of districts, and the first warning radio frequency is one of the plurality of warning radio frequency; and receiving a radio signal according to the first warning radio frequency and demodulating the radio signal to obtain a first audio warning message corresponding to the first district.