Abstract: A battery charging circuit can include: a primary rectifier circuit configured to rectify an input AC voltage into a rectified voltage signal; a DC-DC converter configured to generate a charging current according to the rectified voltage signal, in order to charge a battery; a control circuit configured to adjust the charging current by controlling an operation state of the DC-DC converter according to a charging requirement, in order to make an average value of the charging current meet the charging requirement; and where the charging current is controlled to be zero when an absolute value of the input AC voltage is lower than a predetermined threshold.

Abstract: A control circuit for a resonant converter having at least two output signals, the control circuit including: a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter; and a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals.

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 driving circuit and a driving method are provided. According to embodiments of the present disclosure, a power switch is driven by constant voltage or constant current during different time periods. The power switch is driven by using a first driving current during a Miller platform period, and the power switch is driven by using a second driving current when the Miller platform period ends, where the first driving current is less than the second driving current, so as to optimize EMI, reduce loss and improve efficiency.

Abstract: A rectifier circuit applied in an AC/AC power supply, the rectifier circuit including: a filter circuit configured to receive a DC pulsating voltage, and to generate a supply voltage, where the supply voltage follows the DC pulsating voltage during a first time interval of an operation cycle; and where during a second time interval of the operation cycle, a value of the supply voltage is greater than the value of the supply voltage at an end of the first time interval, in order to reduce a size of the filter circuit.

Abstract: The present disclosure relates to an integrated active noise-canceling wireless Bluetooth headphone, which comprises a housing assembly, primary and secondary magnet sets, primary and secondary magnetic conductive sheet sets, an integrated circuit board assembly, a bracket and a tuning net. The primary and secondary magnet sets, the primary and secondary magnetic conductive sheet sets, the integrated circuit board assembly and the bracket are sequentially laminated in the housing assembly; the tuning net is arranged on an outer surface above the housing assembly; the integrated circuit board assembly is integrated; the periphery of the integrated circuit board assembly is exposed outside the housing assembly; a noise-canceling speaker module interface is embedded in the exposed part of the integrated circuit board and electrically connected with the integrated circuit board; and a light-sensing in-ear detector is surface-mounted on the integrated circuit board.

Abstract: A method and apparatus for displaying road names and a storage medium, the method comprises: performing collision detecting on and loading planned road names according to planned road name data and priority levels of the planned road names included in a navigation route; and performing collision detecting on and loading annotations of other map contents except the navigation route in a navigation map. The method and apparatus for displaying road names and the storage medium are used to enable a user to view the planned road names of the navigation route on an overview page of the navigational route, thereby improving guidance of map display for navigation.

Abstract: A switching power supply circuit can include: a high-frequency switch network configured to generate a high-frequency AC signal by performing high-frequency chopping on a low-frequency AC input signal; a transformer configured to receive the high-frequency AC signal at a primary winding thereof, to perform a voltage conversion on the high-frequency AC signal, and to generate an output signal at a secondary winding of the transformer; and a rectifier module configured to generate a DC signal by rectifying the output signal at the secondary winding of the transformer.

Abstract: The disclosure relates to the field of digital pathology imaging technologies, in particular, to a digital pathology scanner for large-area microscopic imaging. The digital pathology scanner for large-area microscopic imaging includes a plurality of microscopic objectives and a plurality of digital image sensors; the microscopic objectives and the digital image sensors are equal in quantity and are fixed relatively in a one-to-one correspondence manner. The digital image sensors are sequentially distributed so as to form a sensor array. The sensor array enables images formed by the digital image sensors to be sequentially distributed without intervals in a second direction when moving in a first direction, wherein the first direction is perpendicular to the second direction.

Abstract: A controller of a switching power supply can include: a frequency-jittering control circuit configured to generate a first frequency-jittering signal and a second frequency-jittering signal; where a jittering range of an operating frequency of a power transistor in the switching power supply is adjusted by the first frequency-jittering signal; and where a jittering amplitude of a peak value of an inductor current of the switching power supply is adjusted by the second frequency-jittering signal.

Abstract: A switching power supply controller and a control method thereof are disclosed in the invention. By adjusting a switching frequency of the switching power supply based on a radio of a switching period of the power transistor to the sum of the conduction time of the power transistor and the demagnetization time of an inductor, the switching frequency of the switching power supply varies within a preset range under different load conditions. The switching power supply controller of the present invention prevents the effect of the frequency jittering control from being weakened due to the decrease of the switching frequency under heavy load, thereby improving the conducted electromagnetic interference.

Abstract: A control circuit for a switching converter having a main power switch and a freewheeling circuit, can be configured to: control the freewheeling circuit to be turned on in a first time interval after the main power switch is turned off; control the freewheeling circuit to be turned on in a second time interval after the first time interval, in order to reduce turn-on loss of the main power switch; and where the first time interval and the second time interval do not overlap each other in a switching cycle.

Abstract: The present disclosure provides a method for blood pressure calibration selection. The method may include inputting a sample set including data files of a plurality of subjects, the data file of each subject including a plurality of sample PPG waveforms and corresponding blood pressure; obtaining calibration data of the each subject in the sample set, the calibration data at least including first calibration data and second calibration data in different blood pressure states; selecting at least one feature parameter of the plurality of sample PPG waveforms; obtaining a value distribution of a feature parameter among the at least one feature parameter in the sample set based on values of the feature parameter in the first calibration data and the second calibration data; and determining calibration data corresponding to a PPG waveform to be detected by comparing the feature parameter of the PPG waveform to be detected with the value distribution.

Abstract: A communication control circuit for a power supply chip, can include: a main control die having a main control circuit; a plurality of sub-control dice configured to respectively receive a control signal sent by the main control die, where each sub-control die comprises a sub-control circuit; and where a reference ground of each sub-control die is different from a reference ground of the main control die, the reference grounds of the plurality of sub-control dice are different with each other, and communication between the main control die and each sub-control die is achieved by a corresponding level conversion circuit.

Abstract: A control circuit for a switching converter having a main power switch, the control circuit including: a voltage generation circuit configured to be connected with a common connection terminal of the main power switch and an inductor to receive a drain-source voltage of the main power switch, and to generate a first voltage according to the drain-source voltage; a valley detection circuit configured to generate a valley detection signal according to the first voltage when the drain-source voltage resonates to a valley; and where the control circuit is configured to turn on the main power switch according to the valley detection 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 control circuit for controlling a power stage circuit of a switching converter, where the power stage circuit includes a magnetic component and a power switch, can include: the control circuit being configured to determine a turn-on trough of a current cycle by determining whether a time signal corresponding to a lock-on trough of the current cycle is within a threshold range, thereby controlling the power switch to be turned on at the determined turn-on trough; and whereby an ordinal number of the lock-on trough of the current cycle is the same as an ordinal number of the turn-on trough of the last cycle.

Abstract: A switching power supply circuit can include: an energy storage capacitor; a high-frequency switching network coupled to the energy storage capacitor, and being configured to receive a low-frequency AC input voltage, to charge the energy storage capacitor, to perform high-frequency chopping on the low-frequency AC input voltage and/or a voltage of the energy storage capacitor, and to generate a high-frequency AC signal; and a rectifier module coupled to the high-frequency switching network, and being configured to receive the high-frequency AC signal, to rectify the high-frequency AC signal, and to generate a DC signal.

Abstract: The present disclosure relates to the manufacturing of railway steel rail, and a post-weld heat treatment method for 1,300 MPa-level low-alloy heat-treated steel rail. The method comprises: (1) subjecting a steel rail welded joint having a residual temperature of 900-1,100° C. to a first stage cooling to lower the welded joint surface temperature to 650-720° C.; (2) subjecting the steel rail welded joint to a second stage cooling to lower the welded joint surface temperature to 480-550° C.; (3) subjecting the steel rail welded joint to a third stage cooling to lower the welded joint surface temperature to 10-30° C. The heat treatment takes advantage of the welding waste heat and does not require a reheating. The martensitic structure in the metallographic structure of the steel rail welded joint can be controlled to ?1% and the fatigue life can reach 3 million times, which is conducive to operation safety of the railway.

Abstract: A control chip applied in a switching power supply, where the switching power supply includes a rectifier circuit for receiving an AC input voltage and generating a rectified voltage, the control chip including: a high-voltage pin; a detection circuit coupled to the high-voltage pin to determine whether the high-voltage pin is coupled to the AC input voltage or the rectified voltage according to a sampling voltage representing a voltage received by the high-voltage pin; and a discharge circuit, where when the high-voltage pin is determined to be coupled to the AC input voltage, the control chip can enable the discharge circuit to discharge a safety capacitor coupled to an input port of the switching power supply after the switching power supply is powered off, and when the high-voltage pin is determined to be coupled to the rectified voltage, the control chip can disable the discharge circuit.