Abstract: A multi-output switching power supply and a control method thereof are provided. The multi-output switching power supply comprises: a power conversion module performing power conversion on an input signal according to a drive signal to obtain a first output signal; a power distribution module converting the first output signal into plurality of output signals according to a plurality of distribution signals; a control circuit generating the drive signal based on feedback of the output signal from the first power distribution unit, and generating a plurality of distribution signals based on feedback of output signals from other power distribution units. Each power distribution unit comprises a first transistor and a second transistor connected back-to-back, with each distribution signal controlling switching states of corresponding first transistor and second transistor.

Abstract: A control circuit and a control method for a flyback converter, and switching power supply are disclosed. The secondary side control circuit includes a volt-second acquisition unit and a volt-second determination unit. The volt-second acquisition unit calculates the volt-second product of the voltage across the secondary winding. The volt-second determination unit compares the volt-second product with a volt-second threshold to determine the communication status between the primary side control circuit and the secondary side control circuit. This detection process achieves a handshake between the primary and secondary sides and enables precise control of the primary side by the secondary side without the need for additional isolators, reducing circuit cost and loss.

Abstract: Disclosed is a high-efficiency flyback converter and a control method thereof. The flyback converter comprises: a transformer; a first switch transistor and a second switch transistor; a resonant capacitor; a control circuit, for controlling the second switch transistor to be turned on for a first time before the first switch transistor is turned on during a switching cycle, controlling the second switch transistor to maintain turn-off state during a first time stage, to control energy transmission between primary and secondary sides to include two time stages during a switching cycle, the first time stage lasts for a set time period during a freewheeling process. The present disclosure allows the main switch transistor to realize zero-voltage turn-on, thus reducing conduction loss of the primary and the secondary sides, reducing ripples of an output voltage and a current of the secondary side, and being beneficial to improving operating efficiency.

Abstract: This application discloses a multi-output switching power supply and a control method thereof. The multi-output switching power supply comprises a power conversion circuit and plurality of output control transistors. The plurality of output control transistors are connected to the output terminal of the power conversion circuit. The power conversion circuit converts an input voltage into a first output voltage, and the plurality of output control transistors regulate the first output voltage into multiple voltage; the switching state of the main transistor in the power conversion circuit is controlled based on the feedback signal of an output terminal, and the switching state of plurality of output control transistors is controlled based on the output feedback signals of other output terminals. The plurality of output control solution of the present application does not require a two-stage power conversion circuit, and it has low cost, simple control, thus greatly improving system efficiency.

Abstract: A switching mode power supply with zero voltage switching is discussed. It adopts a first secondary signal generator and a second secondary signal generator to control a secondary switch circuit to be turned on once again after a current freewheeling process is over.

Abstract: The present invention discloses a method for managing vehicle-mounted power battery based on stochastic theory, comprising: current source applies current excitation signal to power battery mounted on vehicle by control of BMS, and obtaining voltage measurement signal of the power battery; reconstructing voltage response signal that can effectively restore true voltage of the power battery by processing input and output signals of power battery; obtaining battery model parameters based on reconstructed voltage response signal and current excitation signal; estimating physical parameter values of internal state of power battery based on extended Kalman filter, unscented Kalman filter and like; charging the power battery timely, checking and maintaining the power battery, or replacing the power battery by comparing estimated physical parameter values of internal states with corresponding threshold values.

Abstract: An optical device for homogenizing and diffusing light, an emitting terminal and optical system are provided. An implementation of the optical device for homogenizing and diffusing light includes: a microlens array element, the microlens array element homogenizing and diffusing a light beam in a first direction, a second direction, or a first direction and a second direction, to form a homogeneous light beam, wherein the first direction and the second direction are perpendicular to each other.

Abstract: Disclosed is a flyback converter, a switch control circuit and a control method thereof. A driving current regulation circuit generates a current regulation trigger signal at active state correspondingly according to an operating state of the flyback converter. A switch control driving unit regulates a driving current of the first switch transistor according to the current regulation trigger signal at active state, thus a variation rate of a drain-source voltage across the first switch transistor is slowed down to a preset range. According to the present disclosure, when it is detected that the flyback converter is operating in discontinuous conduction mode or the drain-source voltage across the first switch transistor is high, a switching rate of the first switch transistor is controlled to avoid the voltage across a rectifier switch transistor on a secondary side of the flyback converter to undergo a large jump, and the system EMI is good.

Abstract: Disclosed is a high-efficiency flyback converter and a control method thereof. The flyback converter comprises: a transformer; a first switch transistor and a second switch transistor; a resonant capacitor; a control circuit, for controlling the second switch transistor to be turned on for a first time before the first switch transistor is turned on during a switching cycle, controlling the second switch transistor to maintain turn-off state during a first time stage, to control energy transmission between primary and secondary sides to include two time stages during a switching cycle, the first time stage lasts for a set time period during a freewheeling process. The present disclosure allows the main switch transistor to realize zero-voltage turn-on, thus reducing conduction loss of the primary and the secondary sides, reducing ripples of an output voltage and a current of the secondary side, and being beneficial to improving operating efficiency.

Abstract: Disclosed is a soft switch control circuit and a flyback converter, comprising a primary edge part and a secondary edge part, and obtaining a trigger pulse signal according to a pre-turning on signal of a main switch transistor before the main switch transistor is turned on. The trigger pulse signal is transmitted to the secondary edge part by an isolation module to control the switch at a secondary edge circuit to conduct, to reduce source-drain voltage of the main switch circuit of the primary edge, to make the main switch transistor to turn on when the source-drain voltage is near zero voltage. The switch of the secondary edge circuit is a synchronous rectifying switch transistor or a discharge switch transistor connected at two ends of the synchronous rectifying switch transistor.

Abstract: The energy storage module of the battery pack is located in the housing, the heat insulation panel is located between the energy storage module and the housing, the heat insulation panel includes a heat insulation layer and an outer packaging layer. The outer packaging layer wraps the outside of the heat insulation layer and compresses a thickness of the elastic heat, insulation layer, and a ventilation channel is formed between the heat insulation panel and the energy storage module. The outer packaging layer is configured to release compression of the elastic heat insulation layer when the energy storage module reaches a thermal runaway temperature, and the heat insulation panel is filled between the housing and the energy storage module, thereby slowing down a speed at which heat passes through a side panel and spreads to the outside of the battery pack along the ventilation channel.

Abstract: Disclosed is a protection circuit of a flyback converter and a control method. The protection circuit comprises: an active discharge module, connected to at least one end of a first capacitor in a resonance circuit of the flyback converter to provide a discharge path, and controlling turning-on and turning-off of the discharge path according to the discharge enable signal; in a normal work state, the discharge path is disconnected, the first capacitor works as a resonance capacitor; before the flyback converter is restarted, the discharge path is turned on for a predetermined time period to release charges of the first capacitor, a resonance current after the flyback converter is restarted is reduced to a safe work current of the second switch transistor. Charges stored in the first capacitor can be discharged to release before the flyback converter is restarted to reduce the resonance current and enhance system stability and security.

Abstract: Disclosed is a protection circuit of a flyback converter and a control method. The protection circuit comprises: an active discharge module, for providing a discharge path between a first current terminal and a second current terminal of a switch transistor in a resonance circuit, and controlling turning-on and turning-off of the discharge path according to a discharge enable signal; in the normal work state of the flyback converter, the discharge path is disconnected, the resonance circuit works, before the flyback converter is restarted, the discharge path is turned on for a predetermined time period to release charges stored in the resonance circuit, and the resonance current after the flyback converter is restarted is reduced to the safe work current of the second switch transistor. The resonance current is discharged before the flyback converter is restarted, thus reducing the resonance current and enhancing system stability and security.

Abstract: A bridge circuit with series-connected switches and associated control method. The bridge circuit has a first bridge arm and a second bridge arm coupled to a common node, the first bridge arm has a plurality of series-connected first main switches, each first main switch is coupled in parallel with an auxiliary module, each first auxiliary module has a clamping capacitor and an auxiliary switch, the first bridge arm receives a first main switch signal to control the plurality of series-connected first main switches, the second bridge arm receives a second main switch signal, the control method is sensing voltages of the clamping capacitors in the first bridge arm, correspondingly generating voltage sensing signals, and turning on at least one auxiliary switch for a predetermined time during a dead time according to a sorting result of the voltage sensing signals.

Abstract: A switching mode power supply with zero voltage switching is discussed. It adopts a first secondary signal generator and a second secondary signal generator to control a secondary switch circuit to be turned on once again after a current freewheeling process is over.

Abstract: The present invention discloses a high-precision battery model parameter identification method and system based on output response reconstruction. The method includes: determining a pulse function based on a relationship between a measured voltage signal and a true voltage signal and a relationship between the true voltage signal and a current excitation signal; reconstructing a voltage signal based on the pulse function and the current excitation signal; and obtaining equivalent circuit model parameters of a battery based on the reconstructed voltage signal and the current excitation signal. The present invention has the following beneficial effects: the reconstructed output signal has good authenticity, and the precision of parameter identification is high. Since a complex tuning process of the filter is removed, a parameter identification process is more concise and clearer.

Abstract: A multi-point scanning lidar is disclosed, including at least one laser emitting end for emitting laser light, a scanning device, at least one light path transmission mechanism and a laser receiving end. The scanning device forms at least one light guide surface for transmitting the laser light to at least one target object. The light path transmission mechanism is arranged between the laser emitting end and the scanning device. The scanning device is arranged on a laser light path in such a manner that the light guide surface successively transmits the laser light to different parts of the target object. The laser light path is a path on which the laser light is transmitted to the target object via the light path transmission mechanism, wherein the laser receiving end receives and analyzes the laser light reflected by the target object.

Abstract: A bridge circuit with series-connected switches and associated control method. The bridge circuit has a first bridge arm and a second bridge arm coupled to a common node, the first bridge arm has a plurality of series-connected first main switches, each first main switch is coupled in parallel with an auxiliary module, each first auxiliary module has a clamping capacitor and an auxiliary switch, the first bridge arm receives a first main switch signal to control the plurality of series-connected first main switches, the second bridge arm receives a second main switch signal, the control method is sensing voltages of the clamping capacitors in the first bridge arm, correspondingly generating voltage sensing signals, and turning on at least one auxiliary switch for a predetermined time during a dead time according to a sorting result of the voltage sensing signals.

Abstract: The present invention provides a synchronous rectification control circuit, a method and a flyback switching circuit. A drive circuit outputs a drive signal to control the turn-on and turn-off of a synchronous rectification transistor; a threshold comparison circuit controls the drive circuit to output a pull-up drive signal to turn on the synchronous rectification transistor when a drain-source voltage is lower than a preset low threshold voltage and controls the drive circuit to output a pull-down drive signal to turn off the synchronous rectification transistor when the drain-source voltage is higher than or equal to a preset high threshold voltage; a voltage regulation control circuit controls the drive circuit to output a drive signal for pulling up a voltage of the drive signal to a preset pull-up voltage high value when the drain-source voltage is lower than a preset voltage regulation reference value.