Abstract: A high-efficiency permeability enhancement device for coal-seam gas drainage, wherein, including: a high-pressure gas cylinder, an air compressor being connected to a gas outlet of the high-pressure gas cylinder, a drill pipe, a plurality of jet nozzles being evenly disposed in a circumferential direction of the drill pipe, located below a drill bit, arranged outwards along a radial direction of the drill pipe, and in communication with the gas outlet of the high-pressure gas cylinder; and a plurality of self-driving drill bits being evenly disposed in the circumferential direction of the drill pipe, and located below the jet nozzles, wherein an end of the drill pipe is provided with the drill bit, a front end of the self-driving drill bits is radially defined with a plurality of front spray holes, and the self-driving drill bits are in communication with the gas outlet of the high-pressure gas cylinder.

Abstract: An integrated circuit of a buck-boost converter working in a buck mode with a buck power switching cycle, a boost mode with a boost power switching cycle or a buck-boost mode with a buck-boost power switching cycle. The integrated circuit integrates a first power switch, a second power switch, a third power switch and a fourth power switch, and an output current sensing circuit. The buck-boost power switching cycle consists of a first buck-boost phase, a second buck-boost phase and a third buck-boost phase. The output current sensing circuit samples the current flowing through the first power switch during the second buck-boost phase and the current flowing through the fourth power switch during the third buck-boost phase so as to generate the output current information.

Abstract: A buck-boost converter working in a buck mode with buck switching cycles, a boost mode with boost switching cycles or a buck-boost mode with buck-boost switching cycles. Each of the buck-boost switching cycles has an AC phase, an AD phase and a BD Phase, and the duty cycle of the AC phase is determined by a reference signal, a feedback signal and an inductor current sense signal, the duty cycle of the AD phase is controlled and maintained at a preset duty threshold, the time period of the buck-boost switching cycle equals the time period of the buck switching cycle and the time period of the boost switching cycle.

Abstract: An integrated circuit of a buck-boost converter working in a buck mode with a buck power switching cycle, a boost mode with a boost power switching cycle or a buck-boost mode with a buck-boost power switching cycle. The integrated circuit integrates a first power switch, a second power switch, a third power switch and a fourth power switch, and an output current sensing circuit. The buck-boost power switching cycle consists of a first buck-boost phase, a second buck-boost phase and a third buck-boost phase. The output current sensing circuit samples the current flowing through the first power switch during the second buck-boost phase and the current flowing through the fourth power switch during the third buck-boost phase so as to generate the output current information.

Abstract: A buck-boost converter working in a buck mode with buck switching cycles, a boost mode with boost switching cycles or a buck-boost mode with buck-boost switching cycles. Each of the buck-boost switching cycles has an AC phase, an AD phase and a BD Phase, and the duty cycle of the AC phase is determined by a reference signal, a feedback signal and an inductor current sense signal, the duty cycle of the AD phase is controlled and maintained at a preset duty threshold, the time period of the buck-boost switching cycle equals the time period of the buck switching cycle and the time period of the boost switching cycle.

Abstract: A power converter including a load transient enhancing module and associated method for improving load transient response of the power converter. The load transient enhancing module detects whether load transient is occurring in a load of the power converter, and turns the secondary switch off and locks the secondary switch at “OFF” state to turn on a body diode of the secondary switch once load transient is occurring in the load.

Abstract: A charging mode auto-detection module for a charging circuit and associated charging mode auto-detection method. The charging mode auto-detection module compatibly includes a voltage dividing charging mode, a BC1.2 mode, a SAMSUNG 1.2V/1.2V charging mode and a QC3.0 mode and can detect which of the charging modes is an adaptable charging mode to a needing to be charged device and generate an indication signal indicative of a required charging voltage by the needing to be charged device so that the charging circuit can regulate its bus voltage to the required charging voltage based on the indication signal.

Abstract: A power converter including a load transient enhancing module and associated method for improving load transient response of the power converter. The load transient enhancing module detects whether load transient is occurring in a load of the power converter, and turns the secondary switch off and locks the secondary switch at “OFF” state to turn on a body diode of the secondary switch once load transient is occurring in the load.

Abstract: A charging mode auto-detection module for a charging circuit and associated charging mode auto-detection method. The charging mode auto-detection module compatibly includes a voltage dividing charging mode, a BC1.2 mode, a SAMSUNG 1.2V/1.2V charging mode and a QC3.0 mode and can detect which of the charging modes is an adaptable charging mode to a needing to be charged device and generate an indication signal indicative of a required charging voltage by the needing to be charged device so that the charging circuit can regulate its bus voltage to the required charging voltage based on the indication signal.

Abstract: A bootstrap circuit integrated to a voltage converter integrated circuit (IC) and a voltage converter IC for a switch mode voltage regulator. The bootstrap circuit is used to provide a bootstrap voltage signal for driving a high side switch of the voltage converter IC. The bootstrap circuit has a pre-charger and a bootstrap capacitor. The pre-charger provides a first bootstrap signal to pre-charge a control terminal of the high side switch, and the bootstrap capacitor provides a second bootstrap signal to enhance the charge of the control terminal of the high side switch.

Abstract: A bootstrap circuit integrated to a voltage converter integrated circuit (IC) and a voltage converter IC for a switch mode voltage regulator. The bootstrap circuit is used to provide a bootstrap voltage signal for driving a high side switch of the voltage converter IC. The bootstrap circuit has a pre-charger and a bootstrap capacitor. The pre-charger provides a first bootstrap signal to pre-charge a control terminal of the high side switch, and the bootstrap capacitor provides a second bootstrap signal to enhance the charge of the control terminal of the high side switch.

Abstract: The embodiments of the present circuit and method disclose a bridge rectifier and a driving circuit. The bridge rectifier having a first input, a second input, a first output, and a second output may comprise two high side diodes and two low side switches. The driving circuit may be coupled to the first input of the bridge rectifier and the second input of the bridge rectifier, and the driving circuit may be configured to provide a first driving signal and a second driving signal. The first driving signal may be coupled to a first low side switch and the second driving signal may be coupled to a second low side switch. The first driving signal may be limited to less than a first predetermined driving voltage and the second driving signal may be limited to less than a second predetermined driving voltage.

Abstract: The embodiments of the present circuit and method disclose a bridge rectifier and a driving circuit. The bridge rectifier having a first input, a second input, a first output, and a second output may comprise two high side diodes and two low side switches. The driving circuit may be coupled to the first input of the bridge rectifier and the second input of the bridge rectifier, and the driving circuit may be configured to provide a first driving signal and a second driving signal. The first driving signal may be coupled to a first low side switch and the second driving signal may be coupled to a second low side switch. The first driving signal may be limited to less than a first predetermined driving voltage and the second driving signal may be limited to less than a second predetermined driving voltage.