Abstract: A DC-DC power converter circuit includes a switched-capacitor circuit, an error amplifier, a latched comparator and a switching controller. The error amplifier adjusts an error amplification signal of the error amplifier in response to an output voltage of the switched-capacitor circuit and a reference voltage. The error amplification signal is then fed to the latched comparator as a comparison reference, resulting in the DC-DC power converter circuit being able to more precisely maintain the output voltage within a predetermined range.

Abstract: A reference voltage circuit is provided, which includes bandgap reference circuit, bias current generator, first capacitor, second capacitor, comparator and control logic circuit. In the active mode of the control logic circuit, the control logic circuit controls the bandgap reference circuit to deliver bandgap reference voltage. The comparator transmits first comparison signal to control logic circuit when the first and second capacitors are charged to the bandgap reference voltage. The control logic circuit enters low power mode and controls the bandgap reference circuit to stop delivering the bandgap reference voltage. If the comparator detects the potential difference between the first capacitor and second capacitor exceeds the threshold value, the control logic circuit returns to active mode according to the second comparison signal transmitted form the comparator.

Abstract: A power optimization device and method thereof for energy harvesting apparatus are disclosed. The power optimization device includes a charge pump, a voltage comparator, an output switch, a counter and a frequency control module. By detecting the voltage outputted from the power optimization device under various operating frequencies to obtain a calculation result and increase or decrease an operating frequency of the charge pump according to the calculation result, so as to dynamically adjust the operating frequency to optimize the power outputted from the power optimization device according to the voltage outputted from the energy harvesting apparatus to an electricity storage unit and energy loss caused by the change of the operating frequency.

Abstract: Methods for flyback converters are provided. The method, adopted by a flyback converter circuit including a transformer, including: determining an output voltage output from a secondary circuit of the transformer; feeding a feedback voltage based on the output voltage from the secondary circuit back to a primary circuit of the transformer; increasing a current limit and a switching frequency of a primary current with the feedback voltage; and supplying the primary current to a primary winding of the transformer.

Abstract: A method for acquiring a cooling flow of an expansion card is provided. The expansion card is connected to a circuit board of a host. The host further includes a shell, a power supply unit, a hard disk, a central processor unit, a storage unit and a fan. The method includes building up a model in a thermal simulation software and setting up thermal parameters. The model includes a circuit board, an expansion card and a fan. Structures and positions of the model are same as the host. The method further includes simulating a relationship between the cooling flow of the expansion card of the host and a temperature of the expansion card of the host through a simulation function of the thermal simulation software based on the model and the thermal parameters. The disclosed subject matter also provides a simulation model.

Abstract: A galvanically-isolated device and a method for fabricating the same are provided. The galvanically-isolated device includes a lead frame including a first die-attach pad, a first lead and a second lead. A substrate is disposed on the first die-attach pad. A high-voltage semiconductor capacitor formed on the substrate includes an interconnection structure. The interconnection structure includes an inter-metal dielectric layer structure. A first plate, a second plate and a third plate are formed on the inter-metal dielectric layer structure, separated from each other. The first plate, the second plate and a first portion of the inter-metal dielectric layer structure are composed of a first capacitor. The first plate, the third plate and a second portion of the inter-metal dielectric layer structure are composed of a second capacitor connected in series with the first capacitor.

Abstract: A flyback converter with primary side and secondary side feedback control includes a transformer, a secondary-side feedback unit and a feedback control unit. The secondary-side feedback unit is electrically connected to a secondary winding of the transformer and comprises an isolated signal transceiver device and an error amplifier. The feedback control unit is electrically connected to an auxiliary winding of the transformer and operatively connected to the isolated signal transceiver device. When the flyback converter is operated in heavy load conditions, the feedback control unit receives a secondary feedback control signal sent from the isolated signal transceiver device for feedback control. When the flyback converter is operated in light load conditions, the feedback control unit receives a primary feedback control signal sensed by the auxiliary winding for feedback control.

Abstract: A flyback converter system and feedback controlling apparatus and method of operating the same are disclosed. The feedback controlling apparatus for the flyback converter system includes a primary feedback loop unit for generating a primary feedback signal, and a secondary feedback loop unit for generating a secondary feedback signal, a loop selector. In light-load conditions, the loop selector supplies the primary feedback signal to a PWM controller for feedback control, and the secondary feedback loop unit is disabled by a power monitor to save electrical energy.

Abstract: A galvanically-isolated device and a method for fabricating the same are provided. The galvanically-isolated device includes a lead frame including a first die-attach pad, a first lead and a second lead. A substrate is disposed on the first die-attach pad. A high-voltage semiconductor capacitor formed on the substrate includes an interconnection structure. The interconnection structure includes an inter-metal dielectric layer structure. A first plate, a second plate and a third plate are formed on the inter-metal dielectric layer structure, separated from each other. The first plate, the second plate and a first portion of the inter-metal dielectric layer structure are composed of a first capacitor. The first plate, the third plate and a second portion of the inter-metal dielectric layer structure are composed of a second capacitor connected in series with the first capacitor.

Abstract: Methods for flyback converters are provided. The method, adopted by a flyback converter circuit including a transformer, including: determining an output voltage output from a secondary circuit of the transformer; feeding a feedback voltage based on the output voltage from the secondary circuit back to a primary circuit of the transformer; increasing a current limit and a switching frequency of a primary current with the feedback voltage; and supplying the primary current to a primary winding of the transformer.

Abstract: The invention provides a switching system. The switching system comprises an H bridge, a current router, and a control circuit. The H bridge comprises a first switch and a second switch coupled to a first output node and a third switch and a fourth switch coupled to a second output node, wherein a load is coupled between the first output node and the second output node. The current router comprises a first shunt switch and a second shunt switch coupled between the first output node and the second output node. The control circuit generates a first control signal to control the first switch and the fourth switch, generates a second control signal to control the second switch and the third switch, generates a third control signal to control the first shunt switch, and generates a fourth control signal to control the second shunt switch.

Abstract: The invention provides a switching system. The switching system comprises an H bridge, a current router, and a control circuit. The H bridge comprises a first switch and a second switch coupled to a first output node and a third switch and a fourth switch coupled to a second output node, wherein a load is coupled between the first output node and the second output node. The current router comprises a first shunt switch and a second shunt switch coupled between the first output node and the second output node. The control circuit generates a first control signal to control the first switch and the fourth switch, generates a second control signal to control the second switch and the third switch, generates a third control signal to control the first shunt switch, and generates a fourth control signal to control the second shunt switch.

Abstract: The invention provides an audio interface device and method utilizing a single audio jack connector for plugging into a three-wire analog microphone or a three-wire digital microphone, thereby reducing dimensions and production costs thereof and an electronic system using the same. The audio interface comprises an audio jack connector, having first to third contacts electronically connected with the three-wire microphone plugged thereinto; and an audio processing device, detecting a type of the three-wire microphone plugged into the audio jack connector, outputting a clock signal to the three-wire microphone and receiving a digital audio signal from the three-wire microphone when the type is digital; or receiving analog audio signals from the three-wire microphone when the type is analog.

Abstract: The invention provides a switching system. The switching system comprises an H bridge, a current router, and a control circuit. The H bridge comprises a first switch and a second switch coupled to a first output node and a third switch and a fourth switch coupled to a second output node, wherein a load is coupled between the first output node and the second output node. The current router comprises a first shunt switch and a second shunt switch coupled between the first output node and the second output node. The control circuit generates a first control signal to control the first switch and the fourth switch, generates a second control signal to control the second switch and the third switch, generates a third control signal to control the first shunt switch, and generates a fourth control signal to control the second shunt switch.

Abstract: A flyback converter with primary side and secondary side feedback control includes a transformer, a secondary-side feedback unit and a feedback control unit. The secondary-side feedback unit is electrically connected to a secondary winding of the transformer and comprises an isolated signal transceiver device and an error amplifier. The feedback control unit is electrically connected to an auxiliary winding of the transformer and operatively connected to the isolated signal transceiver device. When the flyback converter is operated in heavy load conditions, the feedback control unit receives a secondary feedback control signal sent from the isolated signal transceiver device for feedback control. When the flyback converter is operated in light load conditions, the feedback control unit receives a primary feedback control signal sensed by the auxiliary winding for feedback control.

Abstract: The invention provides an audio interface device and method utilizing a single audio jack connector for plugging into a three-wire analog microphone or a three-wire digital microphone, thereby reducing dimensions and production costs thereof and an electronic system using the same. The audio interface comprises an audio jack connector, having first to third contacts electronically connected with the three-wire microphone plugged thereinto; and an audio processing device, detecting a type of the three-wire microphone plugged into the audio jack connector, outputting a clock signal to the three-wire microphone and receiving a digital audio signal from the three-wire microphone when the type is digital; or receiving analog audio signals from the three-wire microphone when the type is analog.

Abstract: A microphone package includes a carrier, a cap, an integrated circuit chip, and a microphone unit. The cap covers the carrier to form a storage space. The integrated circuit chip is disposed in the storage space. The microphone unit is disposed in the storage space and stacked on the integrated circuit chip.

Abstract: An isolated feedback system for power converters includes an error amplifier for receiving an input voltage to output an error signal; a modulator circuit to modulate the error signal with a carrier signal; an acoustic transformer unit, one end of the acoustic transformer connected to the modulator circuit, where a frequency of the carrier signal is away from resonant frequencies of the acoustic transformer; and a demodulation circuit connected to the other end of the acoustic transformer and receiving the modulated signal.

Abstract: A flyback converter system and feedback controlling apparatus and method of operating the same are disclosed. The feedback controlling apparatus for the flyback converter system includes a primary feedback loop unit for generating a primary feedback signal, and a secondary feedback loop unit for generating a secondary feedback signal, a loop selector. In light-load conditions, the loop selector supplies the primary feedback signal to a PWM controller for feedback control, and the secondary feedback loop unit is disabled by a power monitor to save electrical energy.

Abstract: The invention provides a microphone. The microphone receives a first sound signal and at least one second electrical signal and outputs a third electrical signal. In one embodiment, the microphone comprises a transducer and a signal processor. The transducer converts the first sound signal to a first electrical signal. The signal processor has a first input terminal receiving the first electrical signal and at least one second input terminal receiving the at least one second electrical signal, and derives the third electrical signal from the first electrical signal and the second electrical signal. In one embodiment, the at least one second electrical signal is derived from a t least one second sound signal by at least one second microphone located in the vicinity of the microphone. In another embodiment, the at least one second electrical signal comprises a wind noise signal derived from wind pressure by a pressure sensor located in the vicinity of the microphone.