Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.

Abstract: In accordance with aspects of the present invention, a magnetic secured transmission system is presented. A magnetic secure transmission (MST) system can include a full-bridge driver that includes four transistors configured to regulate current through a coil; and a driving controller coupled to drive the full-bridge driver at a high frequency. In some embodiments, the transistors in the full bridge regulator are driven with a high frequency pulsed-wave modulated (PWM) signal to control the current through the coil. A method of magnetic secured transmission (MST) of MST data according to some embodiments includes receiving the MST data; generating coil data in response to the MST data; driving transistors in a full bridge at a high frequency to drive current through a coil according to the coil data.

Abstract: In accordance with aspects of the present invention, a method and apparatus for demodulating an amplitude-modulated wireless power signal is presented. A method of receiving an amplitude modulated component of a wireless power transmission signal according to some embodiments includes receiving an input signal, wherein the input signal is based on an amplitude modulated wireless power signal; and applying an offset to the input signal to receive the amplitude modulated component. A demodulator according to some embodiments can include a first voltage-to-current converter that receives an input signal related to an amplitude modulated wireless power signal; a second voltage-to-current converter that receives an offset signal; and a summing node that adjusts a first current produced by the first voltage-to-current converter by a second current produced by the second voltage-to-current converter to produce an output signal.

Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.

Abstract: In accordance with some embodiments of the present invention, a method of adaptively operating a transmit detection circuit is presented. The method includes powering the transmit detection circuit with a capacitor charged by an LDO; receiving a digital ping signal from a transmitter; receiving a clock signal from a local oscillator; updating a register to accommodate timing of the digital ping signal; and generating a signal indicating whether the transmitter is present.

Abstract: In some embodiments, a wireless power charging circuit includes a wireless power receiver configured to receive wireless power from a receive coil and to produce a first voltage; an open loop capacitor divider coupled to receive the first voltage from the wireless power receiver and configured to provide a second voltage, the second voltage being reduced from the first voltage; and a linear battery charger coupled to receive the second voltage from the open loop capacitor and configured to provide a charging voltage to provide to a battery coupled to the system.

Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.

Abstract: In accordance with aspects of the present invention, a magnetic secured transmission system is presented. A magnetic secure transmission (MST) system can include a full-bridge driver that includes four transistors configured to regulate current through a coil; and a driving controller coupled to drive the full-bridge driver at a high frequency. In some embodiments, the transistors in the full bridge regulator are driven with a high frequency pulsed-wave modulated (PWM) signal to control the current through the coil. A method of magnetic secured transmission (MST) of MST data according to some embodiments includes receiving the MST data; generating coil data in response to the MST data; driving transistors in a full bridge at a high frequency to drive current through a coil according to the coil data.

Abstract: In accordance with aspects of the present invention, a wireless power circuit is presented. In some embodiments, the wireless power circuit includes one or more high-side transistors; one or more low-side transistors coupled in series with the one or more high-side transistors, wherein the one or more low-side transistors can be controlled as current sources.

Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.

Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.

Abstract: A transmitter/receiver that includes a wireless power receiving mode and a data transmission mode. In the wireless power receiving mode, the transmitter/receiver receives wireless power through and coil and provides power to a load. In data transmission mode, the transmitter/receives drives the coil according to data to transmit data.

Abstract: A transmitter/receiver that includes a wireless power receiving mode and a data transmission mode. In the wireless power receiving mode, the transmitter/receiver receives wireless power through and coil and provides power to a load. In data transmission mode, the transmitter/receives drives the coil according to data to transmit data.

Abstract: A self-destructive type safe medical needle comprises: a sleeve with an inner cavity, a needle base which can do reciprocating motion in the inner cavity and a needle head, a lock catch head buckled with the needle base, a lock catch head buckled with the needle base, and a conduit connected with the inside of the lock catch head, wherein the sleeve is provided with a barrier block and a lock catch block in the inner cavity, and the needle base is provided with a limiting part which is propped against and matched with the barrier block and a deformable locking part which is locked and matched with the lock catch block. The needle avoids cross infection between patients, secondary use of needle and puncture of staff after use or in the process of destroying. Further, this needle also can realize self-destruction and prevent man-made rotation of the medical needle.