Abstract: In one embodiment, a switching frequency adjusting circuit includes an inverter circuit, a phase difference determining circuit, an average determination circuit, and a loop compensator. The inverter circuit includes an inverter switch configured to switch on and off at a switching frequency. The phase difference determination circuit is configured to obtain a first signal related to an output voltage of the inverter circuit and a second signal related to an output current of the inverter circuit. The average determination circuit is configured to determine a first average value of a first output signal and a second average value of a second output signal, and the loop compensator is configured to compare the first average value or the second average value with a reference value and adjust the switching frequency of the inverter switch based on the comparison result.

Abstract: In one embodiment, a driving circuit device for a totem pole power factor correction converter (PFC) includes: a controller configured to control an initial drive level of a switching tube of the converter; a current judgment circuit configured to determine whether the inductive current of the converter crosses zero or not; a selector configured to compare a power supply voltage of the converter with zero and select, based on a result of the comparison, one of an output level of the current judgment circuit and a preset logic level as an intermediate control level to be output; and an calculator configured to perform a logical operation on the intermediate control level and the initial drive level to generate a target drive level for driving the switching tube.

Abstract: Embodiments of the present disclosure provide methods and apparatus for regulating a converter. The method includes: extracting a ripple voltage in a first frequency band from an input voltage of the converter, the ripple voltage being associated with a ripple component in the input voltage; and regulating a parameter of the converter based on at least the ripple voltage to reduce a ripple component in output of the converter in the first frequency band. The solution of the present disclosure makes it possible to extract the ripple voltage with higher accuracy and to reduce or even eliminate the ripple component of the frequency output by the converter in a cost-effective manner.

Abstract: Embodiments of the present disclosure provide a control method for wireless charging, a wireless charging apparatus and a wireless charging system. The control method includes: controlling a first power converter at a secondary side to charge a chargeable load at a first set current; receiving a sensing signal representing an output current of a second power converter at a primary side; and in response to the output current reaching or exceeding a threshold current, controlling the first power converter to charge the chargeable load at a second set current smaller than the first set current. The scheme of the present disclosure may implement power derating of the wireless charging system and ensure that the primary-side components of the system operate within the safety range.

Abstract: Embodiments of the present disclosure relate to signal transmission device, signal transmission method and communication system. The signal transmission device includes: a digital-to-analog converter configured to convert digital signals to analog signals; a modulator configured to modulate the analog signals to generate modulated pulse signals; and a transmitter configured to transmit, based on the modulated pulse signals, output pulse signals to a receiver, wherein the transmitter is configured to have no common ground with the receiver. In the solution in accordance with embodiments of the present disclosure, the high resolution can also be maintained under high speed data transmission, so as to overcome the conflicts between the resolution and the transmission frequency of the digital signal transmission in the existing schemes.

Abstract: Wireless power supply devices, wireless powered devices, wireless power transmission systems, and manufacturing methods thereof. The wireless power supply device can include a first circuit configured to convert a DC voltage to an AC voltage for wireless power transmission between the wireless power supply device and a powered device. The system can also include a pulse signal receiver configured to receive a first pulse signal from the powered device and to generate a second pulse signal based on the first pulse signal, the first pulse signal being generated based on a feedback signal of the powered device indicating information associated with received power of the powered device. The system can also include a first control unit coupled to the first circuit and the pulse signal receiver, and configured to control conversion of the first circuit based on the second pulse signal.

Abstract: Embodiments of the present disclosure provide a method for controlling a converter and a converter system. The method includes obtaining voltage signals indicating phase voltages of three phases at AC side of a converter, determining, based on the voltage signals, carrier signals of a three-phase switching branches of the converter, wherein carrier signals of two of three phases have the same phase with each other and have a different phase from a carrier signal of the rest phase of the three phases, and magnitude of a phase voltage of the rest phase is between the phase voltages of the two phases, and generating, based on the determined carrier signals and modulation wave signals of the three-phase switching branches, control signals of the three-phase switching branch.

Abstract: Devices and methods for DC-to-DC conversion. The device includes a first transformer having a first winding at a primary side and a second winding at a secondary side. The device also includes a second transformer having a third winding at a primary side and a fourth winding at a secondary side. The device includes a controller configured to control a first current in the first winding of the first transformer and a second current in the third winding of the second transformer to flow in a first pattern, and to control the first current and the second current to flow in a second pattern.

Abstract: Wireless power supply devices, wireless powered devices, wireless power transmission systems, and manufacturing methods thereof. The wireless power supply device can include a first circuit configured to convert a DC voltage to an AC voltage for wireless power transmission between the wireless power supply device and a powered device. The system can also include a pulse signal receiver configured to receive a first pulse signal from the powered device and to generate a second pulse signal based on the first pulse signal, the first pulse signal being generated based on a feedback signal of the powered device indicating information associated with received power of the powered device. The system can also include a first control unit coupled to the first circuit and the pulse signal receiver, and configured to control conversion of the first circuit based on the second pulse signal.

Abstract: Devices and methods for DC-to-DC conversion. The device includes a first transformer having a first winding at a primary side and a second winding at a secondary side. The device also includes a second transformer having a third winding at a primary side and a fourth winding at a secondary side. The device includes a controller configured to control a first current in the first winding of the first transformer and a second current in the third winding of the second transformer to flow in a first pattern, and to control the first current and the second current to flow in a second pattern.

Abstract: Systems and methods of increasing power converter efficiency are provided. A power converter includes a boost circuit configured to receive a DC input voltage ranging from a minimum input voltage value to a maximum voltage value, boost the DC input voltage to a predefined nominal voltage value when the DC input voltage has a value between the minimum input voltage value and the predefined nominal voltage value, and maintain the DC input voltage when the DC input voltage has a value that is greater than or equal to the predefined nominal voltage value and less than the maximum input voltage value. The unit also includes a DC-DC converter coupled to an output of the boost circuit, the DC-DC converter configured to convert the boosted DC voltage or the maintained DC voltage to a DC output voltage.