Abstract: A power supply circuit includes a rectifier branch, a switch branch, a capacitor branch and a control branch. The rectifier branch is used for rectifying an AC power source to output a first power supply. The control branch is used to output a first driving signal for a first time when an absolute value of an AC voltage of the AC power source is less than a first voltage threshold, or when an absolute value of the first voltage across the switch branch is less than a second voltage threshold. In response to the first driving signal, the switch branch conducts and establishes a connection between the rectifier branch and the capacitor branch. When the control branch outputs the first driving signal for the first time, the switch branch conducts for the first time.

Abstract: A current detection circuit comprises a signal input terminal, a signal output terminal, a switch branch, a first current detection branch, and a second current detection branch. The switch branch is configured to block the current flowing from the signal output terminal to the signal input terminal when the switch branch is turned off. When the switch branch is conducting, the current flowing from the signal input terminal through the switch branch to the signal output terminal is the switch branch current comprising a first part linearly related to a first voltage difference, and a second part exponentially related to the first voltage difference. The first voltage difference is the voltage difference between the signal input terminal and the signal output terminal. The first current detection branch outputs a first detection current representing the first part. The second current detection branch outputs a second detection current representing the second part.

Abstract: A switch control method is applied to a hybrid voltage converter including a switched capacitor unit and a freewheeling unit. The method including obtaining the output current of the hybrid voltage converter, when the output current is greater than a first current threshold, controlling the switches in the hybrid voltage converter to operate in parallel conduction mode, when the output current is less than the first current threshold, controlling the switches in the hybrid voltage converter to operate in sequential conduction mode. When the switches operate in parallel conduction mode, N switches in the switched capacitor unit are controlled to turn on and off with the same duty cycle and a phase shift of 360/N degrees. When the switches operate in sequential conduction mode, each switch in the switched capacitor unit is controlled to conduct individually with the same duty cycle in sequence.

Abstract: A calibration method includes obtaining an offset error of the overcurrent protection circuit by changing a current limiting state of the overcurrent protection circuit, adjusting an offset compensation circuit to calibrate the offset error of the overcurrent protection circuit and adjusting a gain calibration circuit based on the current limiting state of the overcurrent protection circuit to calibrate a gain error of the overcurrent protection circuit, wherein the overcurrent protection circuit comprises a first transistor, a second transistor, a third transistor, a first operational amplifier, a gain calibration circuit, an offset compensation circuit, and a driving circuit, and wherein the driving circuit is configured to receive a signal generated by the gain calibration circuit and generate a gate drive signal applied the first transistor and the third transistor.

Abstract: A grounding system includes a first circuit portion and a second circuit portion. The first circuit portion is connected to an input voltage bus and has a terminal being a first ground. The second circuit portion is connected between the first ground and a second ground, and includes a switch branch and a resistor branch. When the positive terminal of a power supply is connected to the input voltage bus and the negative terminal of the power supply is connected to the second ground, the switch branch establishes a first current path between the first ground and the second ground and shorts a first diode in the switch branch. When the positive terminal is connected to the second ground and the negative terminal is connected to the input voltage bus, the switch branch disconnects the first current path and stops shorting the first diode.

Abstract: A system includes at least two transmit coils. The system further comprises at least two transmit circuit units, a detection circuit, a communication module and a controller. The detection circuit is electrically connected to each of the transmit circuit units. The detection circuit and the communication module are both configured to acquire the coupling relationship between each of the transmit coils and a receive coil. The controller is electrically connected to the detection circuit, each of the transmit circuit units, and the communication module. The controller is configured to control, based on the acquired coupling relationship, the current output by each of the transmit circuit unit. The controller controls each of the transmit circuit units to supply a suitable current amplitude and a current phase to each of the transmit coils to achieve control of superimposed magnetic fields generated by currents on the transmit coils.

Abstract: A wireless charging transmitter includes at least two transmit coils and at least two transmit circuit units; wherein the at least two transmit coils are configured to simultaneously transmit electric energy to an external receive coil, the at least two transmit coils are coupled such that orientations of magnetic fields generated by currents on the at least two transmit coils are not parallel and form a first angle, a coupling coefficient between the at least two transmit coils is less than a predetermined threshold and each of the transmit circuit units is electrically connected to each of the transmit coils and configured to supply a current to the transmit coil. Therefore, the current on each of the transmit coils in the wireless charging transmitter generates a corresponding magnetic field.

Abstract: A wireless charging receiving circuit includes a coil, a first energy storage unit, a second energy storage unit, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a filter unit, and a control unit. The coil is connected to the first energy storage unit, the second switch unit and the third switch unit. The first energy storage unit and the first switch unit are connected to the fifth switch unit, and the first switch unit is connected with the filter unit and the fourth switch unit at a first connection node. The fourth switch unit is connected with the second switch unit and the second energy storage unit, and the second energy storage unit is connected with the fifth switch unit, the sixth switch units and the coil.

Abstract: The voltage conversion circuit includes an input terminal, an output terminal, a first energy storage branch, a second energy storage branch, a third energy storage branch and a controller. The input terminal is used to connect with the input power supply. The output terminal is used to connect to the load. The first energy storage branch is connected to the input terminal, the second energy storage branch and the third energy storage branch. The second energy storage branch is connected to the first energy storage branch. The three energy storage branches are connected to the output terminal. The first energy storage branch includes a first capacitor, a second capacitor, a first switch, a second switch, a third switch and a fourth switch. The controller is connected with the first terminals of the switches of the first energy storage branch, the second energy storage branch and the third energy storage branch.

Abstract: The present disclosure relates to a wireless charging transmitter system and its control method. The system includes at least two transmit coils, configured to simultaneously transmit power; at least two transmit circuits, wherein each of the transmit circuits is electrically connected to each of the transmit coils, and is configured to supply a current to the transmit coil; and at least one decoupling circuit, wherein the decoupling circuit is connected to any two coupled transmit coils of the at least two transmit coils. By controlling N switches in a first compensation circuit and/or M switches in a second compensation circuit in the decoupling circuit, compensation capacitors connected in parallel with two terminals of a first inductor and a second inductor are controlled such that the equivalent mutual-inductance of the decoupling circuit may be adjusted to improve decoupling precision and reduce power loss caused by coupling between transmit coils.

Abstract: A current detection circuit includes a current sampling branch, a switch branch, a first current mirror branch, a capacitor branch, a feedback branch and a control branch. The control branch receives the second current and outputs the first current and the first voltage signal. The current sampling branch outputs a first discharging current. The switch branch establishes and disconnects the connection between the first current mirror branch and the capacitor branch. The capacitor branch is charged in response to the first charging current and discharged in response to the first discharging current. The first current mirror branch outputs the first charging current. The feedback branch adjusts the second charging current to adjust the first charging current, so that the total charge of the capacitor branch is balanced with the total charge of discharge within one switching cycle, so that the first current is represented by the first charging current.

Abstract: A wireless charging receiver circuit includes a first bridge arm unit connected to the first node and a common ground node, a second bridge arm unit connected to the second node and the common ground node, a first voltage converter unit connected to the second node and the common ground node, a second voltage converter unit connected to the first node and a common ground node, a filter circuit, a bias power supply circuit, and a control unit configure to control the switch transistors, such that the voltage output terminals of the first voltage converter unit and the second voltage converter unit output a voltage signal.

Abstract: The present disclosure provides step-down rectifier circuit includes a rectifier module, a charge pump module, a filter unit, and a control unit. The rectifier module includes a first bridge arm unit connected to in-phase output terminal of an alternating current signal and a second bridge arm unit connected to out-of-phase output terminal of the alternating current signal. The charge pump module includes a first voltage converter unit and a second voltage converter unit in parallel. The control unit is configured to output a first pulse width modulation signal to control the on and off of the switch transistors in the rectifier module, and output a second pulse width modulation signal to control the on and off of the switch transistors in the charge pump module, such that an operating frequency of the charge pump module is a positive integer multiple of the frequency of the alternating current signal.

Abstract: The current detection circuit includes a signal amplification branch, a first voltage branch, a second voltage branch and a first feedback circuit branch. The first feedback branch generates a feedback signal according to the first voltage generated by the first voltage branch, the second voltage and the first reference voltage generated by the second voltage branch. The signal amplification branch generates a first amplified voltage according to the first voltage and the feedback signal, and generates a second amplified voltage according to the second voltage and the feedback signal. The first voltage branch generates a first voltage and a first output voltage according to the first input voltage and the first amplified voltage. The second voltage branch generates a second voltage and a second output voltage according to the second input voltage and the second amplified voltage.

Abstract: A charging module includes a low-frequency resonant unit, a high-frequency resonant unit, a first capacitor, a rectifier unit and a voltage conversion unit. The low-frequency resonant unit comprises a low-frequency coil and a low-frequency compensation capacitor connected in series. The high-frequency resonant unit comprises a high-frequency coil and a high-frequency tuning capacitor connected in series. The high-frequency tuning capacitor is used to make the difference between the AC voltage between two terminals of the high-frequency resonant unit when receiving high-frequency wireless power signals and the induced electromotive force between two terminals of the low-frequency coil generated by the current flowing through the high-frequency resonant unit is within a preset interval.

Abstract: An apparatus includes a first group of switches connected in series, a second group of switches connected in series, a first flying capacitor between a first common node and a third common node of the first group of switches, a second flying capacitor between a first common node and a third common node of the second group of switches, wherein the first group of switches and the second group of switches are configured such that the apparatus operates in one of three operating modes including a bypass operating mode, a hybrid operating mode and a boost/buck operating mode.

Abstract: A regulator includes an error amplification module, a first switch module, an adaptive conduction module, a second switch module and a feedback module. A first voltage difference between the second terminal and the third terminal of the first switch module is adjusted by the first switch module. The adaptive conduction module is used to adjust a second voltage difference between the second terminal and the third terminal of the second switch module. When the load current is less than a preset current threshold, the control voltage signal controls the first switch module to turn on, and the adaptive conduction module controls the second switch module to turn off. When the load current is greater than or equal to the preset current threshold, the control voltage signal controls the first switch module to turn on and controls the second switch module to be turned on through the adaptive conduction module.

Abstract: A charging and discharging circuit includes a first conversion circuit and a second conversion circuit. The input terminal of the first conversion circuit is used to connect an external power supply. The output terminal of the first conversion circuit is connected to the input terminal of the second conversion circuit and the first terminal of a battery pack, and the second terminal of the battery pack is grounded. N battery cells have N-1 common nodes. Each common node is connected to a corresponding output terminal of the second conversion circuit. In the embodiment of the present application, the second conversion circuit effectively “transfers” the excess charge on the cell with a higher battery voltage in the battery pack to the cell with a lower voltage through the uneven distribution of the charging current.

Abstract: The analog multiplier includes a first signal input module, and a second signal input module or a third signal input module. The first signal input module is configured to output a frequency modulation signal. The second signal input module includes a first energy storage unit, a first switch unit, and a second switch unit. The first switch unit and the second switch unit are alternately turned on or turned off based on a frequency of the frequency modulation signal. The third signal input module includes a second energy storage unit, two third switch units, and two fourth switch units. The third switch unit and the fourth switch unit are alternately turned on or turned off based on the frequency of the frequency modulation signal.

Abstract: A wireless charging receiver circuit includes a first bridge arm unit connected to the first node and a common ground node, a second bridge arm unit connected to the second node and the common ground node, a first voltage converter unit connected to the second node and the common ground node, a second voltage converter unit connected to the first node and a common ground node, a filter circuit, a bias power supply circuit, and a control unit configure to control the switch transistors, such that the voltage output terminals of the first voltage converter unit and the second voltage converter unit output a voltage signal.