Abstract: A detector circuit having a current conversion mechanism for a power converter is provided. An output terminal of the power converter is connected to a first terminal of an inductor. The detector circuit detects a current flowing through the inductor as a detected current, and converts the detected current into a detected voltage. The detector circuit compares the detected voltage with a reference voltage to generate a comparison signal. Each time when a level of the comparison signal reaches a reference level, the detector circuit counts a count value.

Abstract: A switching charger for accurately sensing a small current is provided. First terminals of first transistors and a second transistor are coupled to a system voltage. Second terminals of the first transistors and a first input terminal of an operational amplifier are connected to a battery. A first terminal of a third transistor is connected to a second terminal of the second transistor and a second input terminal of the operational amplifier. A control terminal of the third transistor is connected to an output terminal of the operational amplifier. A first terminal of a fourth transistor is connected to a second terminal of the third transistor. First terminals of fifth transistors are coupled to an input voltage. Control terminals of the first transistors and the fifth transistors are connected to a control circuit. First terminals of sixth transistors are respectively connected to second terminals of the fifth transistors.

Abstract: A power converter having a current limit protection mechanism is provided. An error amplifier of the power converter multiples a difference between (a divided voltage of) an output voltage of the power converter and a reference voltage by a gain to output an error amplified signal. A comparator of the power converter compares the error amplified signal with a ramp signal to output an on-time signal. A current limiting circuit of the power converter detects data related to a high-side switch and a low-side switch of the power converter. The current limiting circuit of the power converter compares working periods and non-working periods of the on-time signal with blanking times to output a current limiting signal. A control circuit of the power converter, according to the current limiting signal, determines whether to control the high-side switch and the low-side switch according to the detected data.

Abstract: A low-dropout regulator having an output voltage switching circuit is provided. In the low-dropout regulator, a low-dropout linear regulator circuit outputs a regulating signal according to a voltage difference between a second terminal of a transistor and a regulating threshold voltage signal or a reference voltage. In the low-dropout regulator, a switch error amplifier circuit outputs a pull-up control signal according to a voltage difference between the second terminal of the transistor and a voltage pull-up switching signal. When a voltage selector circuit of the low-dropout regulator selects the regulating signal, the transistor operates to regulate an output voltage of the low-dropout regulator according to the regulating signal. When the voltage selector circuit selects the pull-up control signal, a switch component is turned on by the pull-up control signal such that the output voltage of the low-dropout regulator is directly pulled up by an input voltage.

Abstract: A power supply control system for a multi-phase power converter is provided. The power supply control system classifies each of a plurality of power converters into one of a plurality of power groups. The power supply control system selects one of the plurality of power converters classified in each of the plurality of power groups as a master power converter, and selects others of the plurality of power converters in each of the plurality of power groups as slave power converters. The power supply control system, according to data of the master power converter, outputs an on-time controlling signal for controlling an on-time of a high-side switch and an on-time of a low-side switch of each of the plurality of power converters, so as to control the plurality of power converters for supplying appropriate power to electronic devices.

Abstract: A power converter having a spectrum spreading control mechanism is provided. In the power converter, a buffer circuit, according to a plurality of energy upper limit values respectively of a plurality of frequency bands falling within a switching frequency range, determines a plurality of buffering ratios corresponding respectively to the plurality of frequency bands. In the power converter, the buffer circuit buffers a voltage signal from an inductor based on one of the plurality of buffering ratios that corresponds to one of the plurality of frequency bands within which a switching frequency of the high-side switch and the low-side switch currently falls. In the power converter, an on-time determining circuit determines an on-time of the high-side switch and an on-time of the low-side switch, according to the buffered voltage signal.

Abstract: A switching charger having fast dynamic response for transition of a load is provided. A first terminal of a high-side switch is coupled to an input voltage. A first terminal of a low-side switch is connected to a second terminal of the high-side switch. A first terminal of an inductor is connected to a node between the first terminal of the low-side switch and the second terminal of the high-side switch. A second terminal of the inductor is connected to a first terminal of a capacitor. A constant on-time circuit determines a duty cycle of an on-time signal according to the input voltage and an output voltage of a node between the second terminal of the inductor and the first terminal of the capacitor. A control circuit controls a driver circuit to drive the high-side switch and the low-side switch according to the on-time signal.

Abstract: A power converter having an overvoltage protection mechanism is provided. A node between a second terminal of the high-side switch and a first terminal of a low-side switch is connected to an inductor. When an output current or an output voltage of the power converter must be released, the output current of the power converter flows to the input power source sequentially through the inductor, the high-side switch being turned on. Under this condition, when an overvoltage protecting circuit determines that a current or a voltage of the inductor or a current or a voltage of the input power source is larger than a threshold, the output current of the power converter flows to a ground through the overvoltage protecting circuit.

Abstract: A sensor is provided. A first terminal of a first current source and a first terminal of a first transistor are connected to a cathode of the photodiode. A control terminal of a second transistor is connected to an output terminal of a first operational amplifier. A first terminal of the second transistor is connected to a second terminal of the first transistor through a first current mirror circuit. A second terminal of the second transistor is connected to a second current source, a second input terminal of a second operational amplifier and a first terminal of a third transistor. A first input terminal of the second operational amplifier is connected to the first terminal of the first transistor. A control terminal of the third transistor is connected to an output terminal of the second operational amplifier.

Abstract: A switching charger for supplying stable power is provided. First input terminals of first and fourth operational amplifiers and a second input terminal of a second operational amplifier are connected to a battery. A second input terminal of the first operational amplifier is coupled to a reference voltage. A first input terminal of the second operational amplifier and a second input terminal of the fourth operational amplifier are connected to an inductor. A first input terminal of a third operational amplifier is connected to an input power source. A second input terminal of the third operational amplifier is connected to a system circuit. A first selector circuit is connected to output terminals of the third and fourth operational amplifiers. A second selector circuit is connected to output terminals of the first and second operational amplifiers and the first selector circuit.

Abstract: Disclosed are methods and systems for a WLAN device operating on DFS channels to calibrate the PRI as well as delays between partial pulses of received radar pulses that are impaired due to channel and filtering effects. The calibrated PRI may approximate the PRI of the transmitted pulses. The calibrated delay between the partial pulses estimates the interval between two partial pulses that originally belong to the same transmitted pulse. Using the calibrated PRI and the calibrated delay between partial pulses, the WLAN device may reconstruct the original pulses from received impaired pulses even when the impaired pulses are delayed and partial pulses of the original pulses. The WLAN device may use the calibrated results to correct the shortened PW and varying PRI of the impaired pulses to restore the partial pulses to their full PW with a relatively uniform PRI, increasing the probability of detecting the radar signals.

Abstract: A switching charger having fast dynamic response for transition of a load is provided. A first terminal of a high-side switch is coupled to an input voltage. A first terminal of a low-side switch is connected to a second terminal of the high-side switch. A first terminal of an inductor is connected to a node between the first terminal of the low-side switch and the second terminal of the high-side switch. A second terminal of the inductor is connected to a first terminal of a capacitor. A constant on-time circuit determines a duty cycle of an on-time signal according to the input voltage and an output voltage of a node between the second terminal of the inductor and the first terminal of the capacitor. A control circuit controls a driver circuit to drive the high-side switch and the low-side switch according to the on-time signal.

Abstract: A power saving system of a battery charger is provided. A control terminal of a first transistor receives a wake-up signal. A counter is connected to a first terminal of the first transistor. The counter determines whether or not a working period of the wake-up signal from the first transistor is larger than a time threshold to output a counting signal. When the counting signal indicates that the working period of the wake-up signal is not larger than the time threshold, the counter and electronic components of an electronic device are turned off, thereby saving power of a battery. When the counting signal indicates that the working period of the wake-up signal is larger than the time threshold, the electronic device is switched from a power saving mode to a normal operation mode. In the normal operation mode, the battery can supply power to the electronic device.

Abstract: A power saving system of a battery charger is provided. A control terminal of a first transistor receives a wake-up signal. A counter is connected to a first terminal of the first transistor. The counter determines whether or not a working period of the wake-up signal from the first transistor is larger than a time threshold to output a counting signal. When the counting signal indicates that the working period of the wake-up signal is not larger than the time threshold, the counter and electronic components of an electronic device are turned off, thereby saving power of a battery. When the counting signal indicates that the working period of the wake-up signal is larger than the time threshold, the electronic device is switched from a power saving mode to a normal operation mode. In the normal operation mode, the battery can supply power to the electronic device.

Abstract: A switching charger for accurately sensing a small current is provided. First terminals of first transistors and a second transistor are coupled to a system voltage. Second terminals of the first transistors and a first input terminal of an operational amplifier are connected to a battery. A first terminal of a third transistor is connected to a second terminal of the second transistor and a second input terminal of the operational amplifier. A control terminal of the third transistor is connected to an output terminal of the operational amplifier. A first terminal of a fourth transistor is connected to a second terminal of the third transistor. First terminals of fifth transistors are coupled to an input voltage. Control terminals of the first transistors and the fifth transistors are connected to a control circuit. First terminals of sixth transistors are respectively connected to second terminals of the fifth transistors.

Abstract: A sensor is provided. A first terminal of a first current source and a first terminal of a first transistor are connected to a cathode of the photodiode. A control terminal of a second transistor is connected to an output terminal of a first operational amplifier. A first terminal of the second transistor is connected to a second terminal of the first transistor through a first current mirror circuit. A second terminal of the second transistor is connected to a second current source, a second input terminal of a second operational amplifier and a first terminal of a third transistor. A first input terminal of the second operational amplifier is connected to the first terminal of the first transistor. A control terminal of the third transistor is connected to an output terminal of the second operational amplifier.

Abstract: A sensor is provided. A first terminal of a first current source and a first terminal of a first transistor are connected to a cathode of the photodiode. A control terminal of a second transistor is connected to an output terminal of a first operational amplifier. A first terminal of the second transistor is connected to a second terminal of the first transistor through a first current mirror circuit. A second terminal of the second transistor is connected to a second current source, a second input terminal of a second operational amplifier and a first terminal of a third transistor. A first input terminal of the second operational amplifier is connected to the first terminal of the first transistor. A control terminal of the third transistor is connected to an output terminal of the second operational amplifier.

Abstract: A sensor is provided. A first terminal of a first current source and a first terminal of a first transistor are connected to a cathode of the photodiode. A control terminal of a second transistor is connected to an output terminal of a first operational amplifier. A first terminal of the second transistor is connected to a second terminal of the first transistor through a first current mirror circuit. A second terminal of the second transistor is connected to a second current source, a second input terminal of a second operational amplifier and a first terminal of a third transistor. A first input terminal of the second operational amplifier is connected to the first terminal of the first transistor. A control terminal of the third transistor is connected to an output terminal of the second operational amplifier.

Abstract: A light sensing device is provided, which includes a photodiode, a capacitor circuit and an ADC. The ADC includes a comparator, a counter, a reset switch, a logic circuit and a reference voltage switching circuit. The reference voltage switching circuit is controlled by the logic circuit to a determination reference voltage. When a primary integration time ends, a first node has a residual voltage that does not reach a reference voltage, the logic circuit controls the reference voltage switching circuit to provide the determination reference voltage to the comparator or the capacitor circuit within a secondary integration time, and the comparator outputs a comparison signal, the logic circuit receives the comparison signal within the secondary integration time, and determines the secondary value and outputs to the counter. The counter generates a primary value within the primary integration time, and the primary value is combined with the secondary value.

Abstract: A light sensing device is provided, which includes a photodiode, a capacitor circuit and an ADC. The ADC includes a comparator, a counter, a reset switch, a logic circuit and a reference voltage switching circuit. The reference voltage switching circuit is controlled by the logic circuit to a determination reference voltage. When a primary integration time ends, a first node has a residual voltage that does not reach a reference voltage, the logic circuit controls the reference voltage switching circuit to provide the determination reference voltage to the comparator or the capacitor circuit within a secondary integration time, and the comparator outputs a comparison signal, the logic circuit receives the comparison signal within the secondary integration time, and determines the secondary value and outputs to the counter. The counter generates a primary value within the primary integration time, and the primary value is combined with the secondary value.