Certain aspects of the present disclosure generally relate to methods and apparatus for powering up a charge pump converter and providing protection and soft-start circuitry therefor. One example charge pump converter generally includes a first transistor and a second transistor coupled in series between an input voltage node and an output voltage node of the charge pump converter, a first capacitive element having a first terminal coupled to a node between the first and second transistors, and a first switch coupled to the input voltage node, the first switch being configured to selectively enable a first drive circuit having an output coupled to a control terminal of the second transistor.

A wireless power receiving terminal and a wireless charging system are disclosed. A switch is arranged between any one of the input ports and any one of the output ports of a full-bridge rectifying circuit for switching the operation mode of the rectifying circuit. The full-bridge rectifying circuit operates normally when the switch is turned off. A portion of rectifying components in the full-bridge rectifying circuit operate in a half-bridge multiplying mode and the other portion of the rectifying components are short-circuited and do not operate when the switch is turned on. Thus, the rectifying mode of the rectifying circuit and then an output voltage of the rectifying circuit are adjustable, and the operation voltage range of the wireless electric energy receiving terminal is expanded and the wireless power receiving terminal can operate normally when the magnetic field intensity is relatively high or relatively low. And at the meanwhile, it is also possible to provide a post-stage circuit (such as DC-DC converter) with relatively small operation voltage range to reduce the cost.

An energy acquisition and power supply system is provided. The power supply system includes a plurality of power elements, each of the power elements including a transistor capable of conduction path switching, a current regulator having a dynamic substrate selection circuit and a reverse leakage current suppression circuit as well as a voltage regulator, wherein the dynamic substrate selection circuit selects a substrate potential of the transistor capable of conduction path switching dynamically to reduce a substrate leakage current of the transistor capable of conduction path switching, and the reverse leakage current suppression circuit is utilized for switching the power element at a local end to reduce transient reverse leakage current and current consumption of the power element at the local end for an input voltage, such that an output current for the power element at the local end is maximized.

The invention allows for transformation to DC of electric fields of unknown or variable strength and polarity, using conventional, easily obtainable components. The device employs plasma arrestors, high voltage capacitors, a step-down transformer, filter capacitors, a bridge rectifier, smoothing capacitors, field-effect rectifier diodes and an intermediate storage capacitor bank to accomplish this.

A harmonic harvesting circuit design for harvesting unrectified AC power contained in the fundamental and harmonic frequencies at the output of conventional rectifying circuits.

A voltage regulating apparatus the simultaneously delivers power at a voltage level and at double the voltage level as a battery mount and a battery pack mount with each other. The battery pack is equipped with a voltage doubling circuit that is activated to double the voltage in response to the mounting of the battery mount and the battery pack with each other. The activation may arise either from a resistance sense contact to close the voltage doubling circuit or a magnetic force contact that triggers a magnetic switch to close the voltage doubling circuit. A further voltage regulating apparatus to switchover between providing power from a battery pack and DC input depending upon which voltage is higher.

An isolated power supply circuit has a first reference ground, a second reference ground, a power source, a first receiving circuit, a second receiving circuit, a first inverter circuit, a second inverter circuit and an isolated conversion circuit. The first reference ground and the second reference ground are isolated from each other. The first receiving circuit is coupled to the first reference ground. The second receiving circuit is coupled to the second reference ground. The power source provides a first power signal for the first receiving circuit directly. The first inverter circuit and the second inverter circuit receive the first power signal and produce a first inverter signal and a second inverter signal. And the isolated conversion circuit outputs a second power signal to the second receiving circuit based on the first inverter signal and the second inverter signal.

An electrical circuit has a first integrated AC switch circuit connecting a first load to an AC voltage when the first integrated AC switch circuit is ON and a second integrated AC switch circuit connecting a second load to the AC voltage when the second integrated AC switch circuit is ON. The first integrated AC switch circuit generates a first DC voltage across a first capacitor and provides a pulse signal. When a VCCE pin of the second integrated AC switch circuit is coupled to a reference ground, a second capacitor is charged by the second integrated AC switch circuit to provide a second DC voltage. And when the VCCE pin of the second integrated AC switch circuit is floating or pulls high, the second capacitor is charged by the pulse signal.

An inductive power transfer receiver is provided including a receiving coil (13) in series with a capacitor (14), a voltage multiplier (15) for providing a DC output, and a power control switch (18) controlled by a controller (19) for regulating the power supplied to a load. An inductive power transfer receiver is provided including a receiving coil in series with a capacitor, a charge pump for providing a DC output, and a power control switch controlled by a controller for regulating the power supplied to a load. A method of power flow control in an inductive power transfer circuit having a power control switch is also provided. The method includes detecting two operational transitions in the circuit and determining a reference timing bases on which operational transition is detected earliest within a detection window. The reference timing is used to developing a signal for controlling the power control switch.

An improved electrical power conversion system converts a high voltage (HV) from a HV electrical power supply to a low voltage. The electrical power conversion system includes at least one power converter and at least one RC network connected in series. The RC network includes a plurality of resistive components and a plurality of capacitive components electrically connected in series. The at least one RC network and at least one power converter are arranged to be connected across a line potential of the HV electrical power supply.