Philips Electronics North America Corporation

Koninklijke Philips Corporation N.v.

North American Philips Corporation

Other

Nai-Chi Lee

Demetri J Giannopoulos

Qiong Michelle Li

Laurence Bourdillon

A system, method and apparatus for contact-less charging of battery operated devices, including a host charger with a power converter and resonant tank circuit and a portable device where the battery is located, with a battery charging control IC, wherein the method obviates the need for a voltage controller in each of both the host and the portable stages. The charging of the battery in the portable device is controlled by a charging controller therein, which is in continual electric communication with the host, whose output power the control IC dynamically monitors and controls. In one embodiment, component count is minimized but battery charging is not optimized when the battery voltage is very low. In the other embodiment, charging efficiency is maximized regardless of the output voltage of the battery.

System, method and apparatus for contact-less battery charging with dynamic control

A power supply comprising a flyback converter and a controller is disclosed. The flyback converter drives a load when electrically coupled to an alternating current power source. The controller controls a soft switching during each switching time period of the flyback converter. Upon an initial switching time period, the controller determines each acceptable switching frequency for the subsequent switching time periods and selects one of the acceptable switching frequencies for soft switching the flyback converter over one or more switching time periods during a constant load.

Control method and apparatus for a flyback converter

A power converter apparatus employing a capacitively coupled feedback network for facilitating bi-directional communication between a primary and secondary side of the converter while maintaining direct current isolation.

Capacitively coupled power converter

A multiple-output, bi-directional flyback converter with soft switching of an input switch is disclosed. The primary-side of the converter is comprised of an input power supply, a transformer with a primary winding and a secondary winding, and an input switch with an associated diode, wherein a first end of the primary winding is connected to the input power supply and a second end of the primary winding is connected to the input switch. A first predetermined number of output voltage circuits are connected to a single secondary winding or one of a plurality of secondary windings each producing an output voltage. Each output voltage circuit has an output switch with an associated diode, and a diode connected in series between the output voltage switch and the secondary winding. A last output voltage circuit with a bi-directional switch and associated diode is connected connection to the secondary winding. A control unit controls the switching of the input switch, the predetermined number of output switches and the bi-directional switch, wherein the switching of the bi-directional switch is controlled so as to allow for soft switching of the input switch.

Single-winding, multiple-output, bi-directional flyback converter

A switch mode power supply (SMPS) and method are provided. In particular, the present invention provides an SMPS in which data is encoded by manipulating voltage pulses on a primary side. The manipulated voltage pulses are then transferred over a transformer to a secondary side. Secondary side pulses generated in response to the primary side pulses are sensed and decoded by a detector. The present invention allows data to be transferred from the primary side to the secondary side without affecting output voltages.

Switch mode power supply and method for transferring data across a power transformer

A method for reducing power losses in a semiconductor switching device in a switching power converter by continuously monitoring an instantaneous power dissipation signal in the switching device and creating an appropriate correction signal to optimize that parasitic power dissipation. A multitude of strobed current and voltage measurement signals associated with the switching device are obtained over a time period using a pair of analog-to-digital converters (ADCs). These measurement signals are used to calculate the multitude of instantaneous power signals, then to derive an average power dissipation signal for a complete cycle and create the correction signal based on a comparison with a reference signal in memory. The correction signal can be, derived in a computer via an algorithm or a look-up table, and would preferably provide a relative adjustment in the timings of the switching device.

Method for adaptive control of switching losses in a drive circuit for active elements

A method for controlling a switching converter includes receiving a digitized waveform of a continuous switch parameter; analyzing the digitized waveform to detect a parameter local minimum; and opening the switch at a parameter local minimum. An apparatus implements the method preferably using a microcontroller and at least one waveform digitizer to determine instantaneous power dissipation. The microcontroller selects an optimum local minimum of the switching waveform to achieve optimum power dissipation.

Multiple valley controller for switching circuit

To improve testability of analog or mixed analog/digital circuit modules mounted on a carrier, three-way switches are placed at input and output ports of the circuit modules. The switches can operate to establish signal connections between a test bus and core circuits inside the modules. The switches can also establish signal connections between the test bus and glue circuits disposed between the modules.

Analog autonomous test bus framework for testing integrated circuits on

Pulse width modulation driver circuitry both limits and regulates the voltage that is applied to a load from a power source which provides a voltage that may far exceed the maximum safe load voltage. The driver circuitry includes a reactive filter coupled to the load, a voltage sensor for sensing the instantaneous voltage across the load, a timer, and a comparator. The reactive filter alternately takes in energy from the power source and discharges it into the load. The voltage sensor, timer, and comparator cooperate with a switch to modulate the application of power to the load and to the reactive filter in response to the instantaneous magnitudes of the load voltage and the power source voltage.

PWM variable voltage load driver with peak voltage limitation

A pulse width modulation driver is capable of regulating the average voltage applied to a load that is powered from a source having a wide range, e.g. 20 to 80 volts DC, of possible voltages. The driver cyclically interrupts the load current at a frequency which is substantially constant. This is particularly advantageous for driving frequency-sensitive loads such as motors.

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Cortlandt Manor, NY, United States of America

Nai-Chi Lee