Abstract: A control circuit for a switching power supply, can include: a sampling circuit configured to obtain an inductor current and a drain-source voltage of a main power transistor in a power stage circuit, in order to generate a sampling signal; where the control circuit generates an inductor current sampling signal according to the sampling signal during an on-period of the main power transistor; and where during an off-period of the main power transistor, the control circuit generates a zero-crossing signal of the inductor current and an overvoltage signal of an output voltage of the switching power supply according to the sampling signal.

Abstract: A control circuit for a resonant converter, can include: a feedforward circuit configured to generate a feedforward current; a charge feedback circuit configured to receive a resonant current sampling signal representing a resonant current of the resonant converter in a first mode to generate a charge feedback signal, and to receive the resonant current sampling signal and the feedforward current together to generate the charge feedback signal in a second mode; and a driving control circuit configured to generate driving signals according to the charge feedback signal and a first threshold signal, in order to control switching states of power transistors of the resonant converter, where the first threshold signal is generated according to an error compensation signal representing an error information between a feedback signal of an output signal of the resonant converter and a reference signal.

Abstract: A method of controlling a synchronous rectifier circuit can include: adjusting a falling amplitude of a drive voltage of a synchronous rectifier switch in the synchronous rectifier circuit in a pull-down mode; adjusting a shielding time during which the synchronous rectifier switch is in a turn-off shielding mode and is not to be turned off; turning off the synchronous rectifier switch after a drain-source voltage of the synchronous rectifier switch reaches a turn-off threshold; and where the falling amplitude of the drive voltage in the pull-down mode and the shielding time for a current period are adjusted according to an operation state of the synchronous rectifier switch in a previous period.

Abstract: A control circuit for a switching power supply, can include: a sampling circuit configured to obtain an inductor current and a drain-source voltage of a main power transistor in a power stage circuit, in order to generate a sampling signal; where the control circuit generates an inductor current sampling signal according to the sampling signal during an on-period of the main power transistor; and where during an off-period of the main power transistor, the control circuit generates a zero-crossing signal of the inductor current and an overvoltage signal of an output voltage of the switching power supply according to the sampling signal.

Abstract: A control circuit for a resonant converter, can include: a feedforward circuit configured to generate a feedforward current; a charge feedback circuit configured to receive a resonant current sampling signal representing a resonant current of the resonant converter in a first mode to generate a charge feedback signal, and to receive the resonant current sampling signal and the feedforward current together to generate the charge feedback signal in a second mode; and a driving control circuit configured to generate driving signals according to the charge feedback signal and a first threshold signal, in order to control switching states of power transistors of the resonant converter, where the first threshold signal is generated according to an error compensation signal representing an error information between a feedback signal of an output signal of the resonant converter and a reference signal.

Abstract: A control circuit for controlling a synchronous rectification switch of a resonant converter, where in a switching cycle, the control circuit is configured to: delay a first time period from a first moment; control the synchronous rectification switch to be turned on when a drain-source voltage of the synchronous rectification switch reaches a first threshold after the first time period; and where the first time period is generated based on an operating state of the synchronous rectification switch in a previous switching cycle.

Abstract: A method of controlling a synchronous rectifier circuit can include: adjusting a falling amplitude of a drive voltage of a synchronous rectifier switch in the synchronous rectifier circuit in a pull-down mode; adjusting a shielding time during which the synchronous rectifier switch is in a turn-off shielding mode and is not to be turned off; turning off the synchronous rectifier switch after a drain-source voltage of the synchronous rectifier switch reaches a turn-off threshold; and where the falling amplitude of the drive voltage in the pull-down mode and the shielding time for a current period are adjusted according to an operation state of the synchronous rectifier switch in a previous period.

Abstract: A control circuit for controlling a synchronous rectification switch of a resonant converter, where in a switching cycle, the control circuit is configured to: delay a first time period from a first moment; control the synchronous rectification switch to be turned on when a drain-source voltage of the synchronous rectification switch reaches a first threshold after the first time period; and where the first time period is generated based on an operating state of the synchronous rectification switch in a previous switching cycle.

Abstract: A method and device for providing dynamically determined gift creation and dissemination in an online environment, including: receiving a gifting request from a first user for dynamically creating and disseminating one or more gifts to one or more recipients in the online environment, wherein the gifting request includes one or more gifting constraints that un-deterministically specify at least one of (1) a respective identity for at least one recipient and (2) a respective gift value for at least one gift; and dynamically creating and disseminating at least one gift in accordance with the one or more gifting constraints, including at least one of: dynamically selecting a respective gift value for at least one gifts in accordance with the one or more gifting constraints; and dynamically determining a respective identity for at least one recipient for at least one gift in accordance with the one or more gifting constraints.

Abstract: A method for distributing virtual items includes receiving, from a sender client device, a request for distributing virtual items to a set of recipient client devices. The method includes transferring a total amount of virtual items from an account associated with the sender client device to an account associated with a server device, and defining virtual item packages that include the total amount of virtual items transferred. The method includes sending information of the virtual item packages to the sender client device whereby the sender client device generates and sends a link associated with the distribution of virtual items to the set of recipient client devices. The method also includes receiving, from a recipient client device, a request to receive virtual items. The method further includes transferring a virtual item package from the account associated with the server device to an account associated with the recipient client device.

Abstract: A method and device for providing dynamically determined gift creation and dissemination in an online environment, including: receiving a gifting request from a first user for dynamically creating and disseminating one or more gifts to one or more recipients in the online environment, wherein the gifting request includes one or more gifting constraints that un-deterministically specify at least one of (1) a respective identity for at least one recipient and (2) a respective gift value for at least one gift; and dynamically creating and disseminating at least one gift in accordance with the one or more gifting constraints, including at least one of: dynamically selecting a respective gift value for at least one gifts in accordance with the one or more gifting constraints; and dynamically determining a respective identity for at least one recipient for at least one gift in accordance with the one or more gifting constraints.