A device includes a readout circuit coupled between an input node and an output node; a microelectromechanical systems (MEMS) device coupled to the input node; and a first charge controlled clamp circuit coupled between the input node and a first bias node.

A bidirectional wireless power transfer system for transferring power comprises a power stage electrically connected to a transceiver element for an electric field and/or a magnetic field, and for extracting power from a generated electric field and/or a generated magnetic field. The power stage is for inverting an inputted power signal and for rectifying a received power signal. The system further comprises a trigger circuit for synchronizing wireless power transfer; and a clock generator for generating a clock signal. The system further comprises a switching element electrically connected to the power stage, and selectively electrically connected to the trigger circuit and the clock generator, such that: when the switching element electrically connects the clock generator to the power stage, the transceiver element is configured to transfer power by generating an electric field and/or a magnetic field, and when the switching element electrically connects the trigger circuit to the power stage, the transceiver element is configured to extract power from a generated electric field and/or a generated magnetic field.

A bidirectional wireless power transfer system for transferring power comprises a power stage electrically connected to a transceiver element for an electric field and/or a magnetic field, and for extracting power from a generated electric field and/or a generated magnetic field. The power stage is for inverting an inputted power signal and for rectifying a received power signal. The system further comprises a trigger circuit for synchronizing wireless power transfer; and a clock generator for generating a clock signal. The system further comprises a switching element electrically connected to the power stage, and selectively electrically connected to the trigger circuit and the clock generator, such that: when the switching element electrically connects the clock generator to the power stage, the transceiver element is configured to transfer power by generating an electric field and/or a magnetic field, and when the switching element electrically connects the trigger circuit to the power stage, the transceiver element is configured to extract power from a generated electric field and/or a generated magnetic field.

A circuit comprises a power source, an Open Loop Reactance Matching Circuit Control Signal Generator (OLRMCCSG), an Open Loop Reactance Matching (OLRM) circuit, and a load. The power source supplies an input voltage and an input current used to drive the load. The load is an inductive type load or a capacitive type load. If the power source operates as a voltage source, then the OLRMCCSG uses input voltage information to control the OLRM circuit to generate a reactance matching voltage that is phase delayed with respect to the input voltage. If the power source operates as a current source, then the OLRMCCSG uses input current information to control the OLRM circuit to generate a reactance matching current that is phase delayed with respect to the input current. The reactance matching voltage or the reactance matching current causes the input voltage and the input current to be in phase.

A wireless charging device (20) and a to-be-charged device (10) are provided, to support two or more wireless charging technologies, so as to optimize a circuit design and improve power transmission efficiency. The to-be-charged device (10) includes: a first receiving coil, configured to receive an electromagnetic signal based on a first wireless charging technology, and convert the electromagnetic signal into an alternating current signal; and a second receiving coil, configured to receive an electromagnetic signal based on a second wireless charging technology, and convert the electromagnetic signal into an alternating current signal, where the first wireless charging technology and the second wireless charging technology support different resonance frequency ranges.

A picture frame including a plurality of frame elements and a speaker system disposed within the plurality of frame elements. The speaker system includes one or more audio speakers disposed within the plurality of frame elements or between the plurality of frame elements, at least one control panel configured for manual control of the one or more audio speakers, and one or more rechargeable batteries configured to power the speaker system. The frame elements are configured to hold a chemical canvas on which artwork is rendered either mounted within the frame elements or over the frame elements.

A picture frame including a plurality of frame elements and a speaker system disposed within the plurality of frame elements. The speaker system includes one or more audio speakers disposed within the plurality of frame elements or between the plurality of frame elements, at least one control panel configured for manual control of the one or more audio speakers, and one or more rechargeable batteries configured to power the speaker system. The frame elements are configured to hold a chemical canvas on which artwork is rendered either mounted within the frame elements or over the frame elements.

A circuit control apparatus includes: a charging control module, a circuit switching module, a capacitance detection module, a first change-over switch, and a first polar plate. The first change-over switch includes a first common terminal, a second terminal, and a third terminal. The first polar plate is electrically connected to the first common terminal. The charging control module is electrically connected to the second terminal. The capacitance detection module is electrically connected to the third terminal.

A circuit control apparatus includes: a charging control module, a circuit switching module, a capacitance detection module, a first change-over switch, and a first polar plate. The first change-over switch includes a first common terminal, a second terminal, and a third terminal. The first polar plate is electrically connected to the first common terminal. The charging control module is electrically connected to the second terminal. The capacitance detection module is electrically connected to the third terminal.

Active electromagnetic shielding for dynamic high power wireless charging and related electrified roadway systems, method, and wireless power transmitters is disclosed. A wireless power transmitter includes a first canceling coil offset from a power transmission coil, a second canceling coil offset from the power transmission coil, and circuitry electrically connected to the first canceling coil and the second canceling coil. The circuitry is configured to deliver canceling currents to the first canceling coil and the second canceling coil to destructively interfere with portions of electromagnetic fields generated by the power transmission coil.