Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).

An inductive charging circuit coupled to a winding of a power converter and a supply terminal of a controller of the power converter. The inductive charging circuit comprising an input coupled to the winding, the input coupled to receive a switching voltage generated by the power converter, an inductor coupled to the input to provide an inductor current in response to the switching voltage, a first diode coupled to the inductor to enable the inductor current to flow from the input of the inductive charging circuit to an output of the inductive charging circuit; and the output of the inductive charging circuit coupled to the supply terminal of the controller, the output of the inductive charging circuit configured to provide an operational current responsive to the switching voltage, the controller is configured to control a power switch of the power converter to generate the switching voltage.

A single-phase and three-phase compatible AC-DC conversion circuit includes a first switching component, a second switching component, a third switching component, three switch bridge arms, a fourth switching component, a pre-charge resistor, a capacitor assembly, and a control unit. Each switch bridge arm has an upper switch and a lower switch connected in series. The fourth switching component is coupled between a first phase of a three-phase power source and a common-connected node of the switch bridge arm corresponding to a second phase of the three-phase power source. The control unit turns on the fourth switching component, turns on the upper switch coupled to the first switching component, and turns on the lower switch coupled to the fourth switching component to provide a discharge path so that the capacitor assembly discharges through the pre-charge resistor on the discharge path.

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.

A single-phase device-multiplexing active power decoupling cascaded rectifier and control method thereof. The rectifier includes: n device-multiplexing active power decoupling H-bridge units that are cascaded, n≥2; each unit including: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of bridge arm H2; and a bridge arm H1 of a first unit being sequentially connected in series to an inductor, resistor, and power supply, and then connected to a bridge arm H2 of a last unit. A power switch module of an H-bridge rectification unit is multiplexed, which not only realizes unit power factor rectification of the unit, but also provides a loop for secondary ripple power to achieve secondary ripple power decoupling control.

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.

An electrical circuit for charging a DC voltage source from an AC voltage network. The circuit includes an input that is able to receive an AC voltage from the voltage network, and a first output able to be connected to the DC voltage source. An insulating stage formed using a plurality of capacitors is arranged so as to electrically insulate the input from the first output of the circuit. A frequency-raising stage is arranged between the input of the circuit and the insulating stage so that the capacitors of the insulating stage are in a circuit portion that has flowing through it an AC current at a frequency that is greater than that of the AC network.

An apparatus including direct-current (DC)-alternating-current (AC) inverter circuitry, first and second circuits, and output circuitry. The DC-AC inverter circuitry inverts a DC input signal corresponding to an input voltage to an AC signal. The first circuit and second circuits respectively include inductive isolation circuits driven in response to power from the at least one AC signal, and rectifier circuits that responds to the inductive isolation circuits by outputting first and second rectified signals, where at least one of the first and second rectifier circuits characterized as being limited by a voltage breakdown rating. The output circuitry provides a DC output voltage signal and to cascade a plurality of signals, including the first and second rectified signals, to provide a voltage source that is dependent on the first and second rectified signals and greater than voltage breakdown rating.

An integrated circuit for a power supply circuit configured to generate an output voltage of a target level from an alternating current (AC) voltage. The power supply circuit includes a first capacitor and an inductor configured to receive a voltage according to the AC voltage, and a transistor configured to control an inductor current flowing through the inductor. The integrated circuit is configured to switch the transistor, and includes: an identification circuit configured to identify whether a voltage level of an effective value of the AC voltage is a first level or a second level, and a signal output circuit configured to output a driving signal to drive the transistor, and correct the driving signal to thereby correct the input current, in response to the voltage level of the effective value being the first level and the second level, respectively.

A motor drive that outputs a sinusoidal waveform utilizes power switching devices operable at high switching frequencies. The switching devices may be operated, for example, between twenty kilohertz and one megahertz. A first filter is included at the output of the motor drive which has a bandwidth selected to attenuate voltage components at the output which are at the switching frequency or multiples thereof such that the output voltage waveform is generally sinusoidal. Additional filtering is included within the motor drive to establish a circulation path for common mode currents within the motor drive. Further, a shield is provided adjacent to those components within the motor drive that may experience voltage or current waveforms at the switching frequency or multiples thereof to cause radiated emissions to establish eddy currents within the EMI shield rather than passing through the shield into the environment.