CHICONY POWER TECHNOLOGY CO., LTD.

A power converter includes a conversion circuit, a controller, a snubber circuit, and an energy storage component. The conversion circuit receives an input voltage and outputs an output voltage. The controller is coupled to the conversion circuit, and is used to control the conversion circuit to adjust the output voltage. The snubber circuit is coupled between the conversion circuit and the controller, and is used to provide a snubber voltage. The energy storage component is used to receive the snubber voltage as an operating voltage for the controller. The controller, the energy storage component, and the snubber circuit for coupled to a first node.

A power converter includes a transformer, a resonant circuit, a switch circuit, a resonant adjustment circuit, and a controller. The transformer includes a primary-side winding, a secondary-side winding, and a magnetizing inductance. The resonant circuit includes a first resonant capacitor, and the switch circuit includes a first switch and a second switch. The resonant adjustment circuit is coupled to the first resonant capacitor, and the controller is coupled to the resonant adjustment circuit. The controller controls the resonant adjustment circuit to adjust a resonant current flowing through the first resonant capacitor according to an output voltage of the power converter so as to adjust a current value that when the resonant current and a magnetizing current flowing through the magnetizing inductance intersect to be substantially equal to a predetermined value.

A power supply includes a converter circuit, a switching circuit and a control circuit. The converter circuit includes a transformer, a primary side switch and a secondary side switch. The switching circuit includes first and second capacitors, first and second sets of switches. In a first phase, the primary side switch is in the conduction state, causing a magnetizing inductor of the transformer to store energy. In a second phase, the primary side switch is in the off state, causing the magnetizing inductor to release the energy. In a first mode of the second phase, a first amount of the energy is transferred through the first set of switches to the first capacitor. In a second mode of the second phase, a second amount of energy is transferred to the second capacitor through the second set of switches.

A power supply comprising a conversion circuit, a measurement circuit and a control circuit. The conversion circuit is configured to convert an input voltage to an output voltage. The measurement circuit is configured to measure an input current of the input terminal. The measurement circuit is configured to calculate multiple harmonic parameters according to the input current, and the plurality of harmonic parameters corresponds to multiple harmonic frequencies. The control circuit is configured to generate multiple frequency multiplication signals corresponding to the multiple harmonic frequencies based on a frequency of the input voltage. When a change rate of the input current between multiple measurement intervals is greater than a preset value, the control circuit is configured to generate a current compensation signal according to the multiple frequency multiplication signals and the multiple harmonic parameters, and generate a control signal according to the current compensation signal.

A printed circuit board of a planar transformer includes a first column hole, a second column hole, and a plurality of winding layers. At least one of the winding layers includes a first winding and a second winding connected in series. The first winding surrounds the first column hole and has a first opening direction. The second winding surrounds the second column hole and has a second opening direction. The first opening direction is different from the second opening direction. Consequently, the windings on the plurality of layers may be connected in series through conductive holes of the PCB to increase the number of winding turns.

A power supply device includes a transformer, a primary circuit, a secondary circuit, and a mode control unit. The transformer is coupled between the primary circuit and the secondary circuit. The primary circuit includes two rectifying switches. The secondary circuit includes a mode switching switch. The mode control unit is coupled between one of the two rectifying switches and the mode switching switch to control the mode switching switch to be turned on or off based on a switching state of the coupled rectifying switch. When the power supply device operates in a first operating mode, the mode switching switch is synchronized with the lower arm switch, and the power supply device outputs a first voltage. When the power supply device operates in a second operating mode, the mode switching switch is turned on, and the power supply device outputs a second voltage higher than the first voltage.

A charger is provided, including a body and a plug. The body includes a plug receiving portion and an insertion portion. A metal contact piece is arranged on the plug receiving portion. The plug is detachably assembled on the body, and the plug includes a first surface, a second surface, a third surface, a live wire terminal, a neutral wire terminal, a ground terminal, and a coupling portion. The third surface is a surface respectively adjacent to the first surface and the second surface. A contact end of the ground terminal protrudes from the second surface, and the coupling portion is located on the third surface. The coupling portion is correspondingly assembled to the insertion portion, and the contact end of the ground terminal is arranged corresponding to the metal contact piece and continuously abuts against the metal contact piece under an acting force.

A power converter includes a transformer, a resonant circuit, a first switch, a second switch, an input detection circuit, an output detection circuit, and a controller. The first switch and the second switch are jointly connected at a node, and the node is coupled to the resonant circuit to acquire a first output voltage information corresponding to an output voltage. The input detection circuit is coupled to the first switch to acquire an input voltage information according to an input voltage. The output detection circuit acquires a second output voltage information corresponding to the output voltage. The controller receives the first output voltage information, the second output voltage information, and the input voltage information to turn on or turn off the first switch and the second switch according to the first output voltage information, the second output voltage information, and the input voltage information.

A switching control system, including: switch units, configured to separately receive one of alternating currents and couple to a load; a detection unit, configured to detect the alternating currents; and a control unit, configured to, after receiving a switching signal, and in response to detecting that a power supply alternating current and a backup alternating current are in a polarity half cycle and a voltage difference is less than a preset voltage, perform: closing a first turn-on direction of a power supply switch unit; opening a second turn-on direction of a backup switch unit; closing a second turn-on direction of the power supply switch unit; and opening a first turn-on direction of the backup switch unit; where the first turn-on direction is opposite to a direction of the polarity half cycle, and the second turn-on direction is the same as the direction of the polarity half cycle.

An asymmetric half-bridge flyback power converter includes a transformer, a resonant circuit, a first switch, a second switch, a discharging switch, an energy storage capacitor, and a controller. The first switch and the second switch are connected in series at a node, and the resonant circuit is coupled between the node and the transformer. The discharging switch is coupled between the node and the energy storage capacitor. When the power converter operates in a discontinuous resonant mode, and before the first switch is turned on by the controller, the discharging switch is first turned on so that the energy storage capacitor stores energy to rise a current flowing to the node.