Abstract: A power supply system includes an adapter to receive power from a power source, and output a regulated output voltage (Vout). A tip receives Vout from the adapter, and output Vout to an electronic device. The tip includes active circuitry to adjust a programming voltage (Vprog). Vprog is fed back to the adapter to control a magnitude of Vout.

Abstract: Compensation for a switching regulator is attained by developing a compensation signal for a switching regulator that is independent of changes in the switching frequency. The regulator operational frequency is established in accordance with a repetitive ramp signal of constant slope and adjustable frequency. The voltage of the ramp signal is monitored and an offset signal is derived therefrom. The peak value of the ramp signal, detected during monitoring, is used to derive the offset signal. Initiation of the compensation occurs at the same duty cycle point during each switching cycle and thus is independent of switching frequency. The compensation signal may have a linear or non-linear slope.

Abstract: A voltage reference circuit is provided which includes PTAT and CTAT generating components. The CTAT components are provided in a feedback configuration about an operational amplifier and are combined with PTAT generating components which are coupled to the inputs of the amplifier. The combination of the CTAT and PTAT components is effected in a manner which provides for a temperature curvature correction of the output voltage of the circuit.

Abstract: A motor vehicle door locking system and a process for controlling the locking system. A piezoelement is assigned to a stationary outside door handle and is used to detect touching and/or actuation of the outside door handle. To increase the operating reliability, to simplify troubleshooting and to minimize the power consumption, there is a monitoring device that monitors the piezoelement. The piezoelement is monitored for fracture and the occurrence of the first signal.

Abstract: This invention provides a circuit and a method for protecting electronic circuits from electrostatic damage ESD. The invention teaches a dynamic floating silicon-controlled rectifier SCR for use as an ESD clamp. The n-well of the SCR is biased to the supply voltage Vdd under normal conditions to provide good latch-up performance. During ESD events, the n-well is floated to improve clamping performance. In addition, this invention utilizes a floating-well control circuit which provides better latch-up immunity during normal operation after the ESD event has passed.

Abstract: A thermal protection circuit arranged in an integrated circuit for protecting a power delivery is disclosed. The thermal protection circuit for protecting a power delivery circuit includes a first thermal sensing circuit exhibiting a negative temperature coefficient characteristic for sensing a temperature of the power delivery circuit and providing a first voltage, a second thermal sensing circuit exhibiting a positive temperature coefficient characteristic for transforming the temperature of the power delivery circuit to a second voltage, an amplifier electrically connected to the first voltage and the second voltage for providing a control signal, wherein the amplifier is a function of a voltage difference between the first voltage and the second voltage, and a switch electrically connected to an output of the amplifier for limiting a maximum current passing there through in response to the control signal.

Abstract: The electrostatic discharge protection circuit includes: at least two bipolar transistors Q1-Qn coupled in series; a top one Qn of the at least two bipolar transistors coupled to a protected node 10; a bottom one Q1 of the at least two bipolar transistors coupled to a common node 12; at least two resistors R1-Rn coupled in series; each of the at least two resistors is coupled to a corresponding base of one of the at least two bipolar transistors; and a bottom one R1 of the at least two resistors coupled between a base of the bottom one Q1 of the at least two bipolar transistors and the common node 12.

Abstract: A regulator system and method for controlling the level of an output voltage. The regulator system comprises a regulator, enabled in response to an enable signal, for converting a level of an input signal into a predetermined value and providing a first output signal, a smoother for smoothing the first output signal from the regulator and providing the smoothed signal as a second output signal, and an enable signal generator for generating an initial version of the enable signal to control an enable period of the regulator so that the second output signal has a target level and adjusting an enable active period of the initial version of the enable signal to generate a new version of the enable signal when a level of the second output signal associated with the initial version of the enable signal is different from the target level.

Abstract: A switching power supply unit includes first and second switching circuits which alternately turn first and second switching elements on and off with an intermediate period in which both are turned off, and energy is stored in a primary winding of a transformer during an ON period of the first switching element and the energy is discharged from a secondary winding of the transformer during an OFF period of the first switching element. A control circuit includes an OFF period extending circuit connected to a control terminal of the first switching element, such that a transistor remains turned on for a desired period even after the energy has been discharged from the secondary winding, extending the OFF period of the first switching element for the desired period. In a light load operation, a phototransistor in the second control circuit is turned on so that the ON period of the second switching element will be shorter than the time required to discharge the energy from the secondary winding.

Abstract: The invention relates to a slaved supply for slave element tied by a serial link to a master element. The slaved supply comprises a slave module for regulating the supply voltage comprising a module (1) for sampling and for detecting the peak value of the master digital output signals delivering a sampled peak value of the master output signals and a module (2) for slaving the slave supply voltage to a value substantially equal to that of the sampled peak value of the master output signals. The slave output signals delivered exhibit a peak amplitude matched to that of the master output signals. Application to the supply of master slave circuits in mobile or fixed telephony.

Abstract: A voltage supply unit which operates at an internal switching frequency and has a capacitor connected in parallel with its output is connected to the input of a sensor unit operating at an internal switching frequency. The connecting line contains a resistor which, together with a capacitor connected in parallel with the input, forms a filter.

Abstract: A drive circuit for driving an FET includes a charge pump circuit which comprises multi-stage switching elements, condensers, and inversion buffers, and operates in response to the oscillatory output of an oscillator circuit; and a comparison means for comparing the output voltage of the charge pump circuit with a preset reference voltage to thereby control the oscillation of the oscillator circuit. The charge pump circuit is thus operated intermittently so as to provide a sufficiently large gate voltage to the MOSFET in a stable manner, thereby maintaining a constant output-load characteristic.

Abstract: A non-contact power supply device having a primary unit and a secondary unit of a coupling transformer for driving a load such as decoration lamps. The primary unit is installed inside of premises and the secondary unit is installed outside of the premises and the decoration lamps are connected to the secondary unit. The primary unit and the secondary unit are attached to an intervening body such as a window or a wall in a face-to-face fashion. The non-contact power supply device is able to control and change an output voltage of the secondary unit and lighting patters of the decoration lamps solely from the inside of the premises without need for a user to go outside.

Abstract: A power supply module includes a plurality of power supply modules. One of the power supply units is designated as a master power supply unit. Other power supply units are handled as expansion power supply units. The power supply modules can be connected in parallel on a DIN rail so that the master power supply unit may supply an external AC voltage to the expansion power supply units. When a desired power supply capacity exceeds a power supply capacity of the master power supply unit, an expansion power supply unit is connected in parallel with the master power supply unit in order to increase the power supply capacity.

Abstract: An installation for transmission of electric power by means of high-voltage direct current has two converters (SRI, SRII), each of which is connected to an alternating-voltage network (NI, NII) and which are connected to each other through a dc connection (L). One converter (SRI) is controlled as a rectifier and another converter (SRII) is controlled as an inverter. One converter (SRI) is current-controlling and another converter (SRII) is voltage-controlling. The installation has means (VARC.sub.rect) adapted, at such a change of the control angle (.alpha..sub.rect) of the current-controlling converter (SRI) that the angle reaches a limit of a predetermined interval (.alpha..sub.max nom rect -.alpha..sub.min nom rect) to control, by means of the voltage-controlling converter (SRII), the direct voltage (Ud) of the transmission in such a way that said change is limited.

Abstract: A power converter with a self synchronized synchronous rectifier includes one or two drive windings to provide positive drive to the control electrodes of the controlled switches (FETs) of a self synchronized synchronous rectifier. The polarities of these windings am selected so that the switched devices are driven appropriately to rectify the periodic signal output of the secondary winding of the power transformer of the converter. In some arrangements one or two drive windings are included as extra windings in the power transformer and connected to provide the proper polarity drive signals. The turn ratios of the drive windings to the other windings are selected to provide the proper gate drive signal levels. In an alternative arrangement a separate drive transformer may be provided to supply the gate drive signals.

Abstract: An N-phase switching voltage regulator includes N current sensing elements which carry respective phase currents. The voltages present at the switch node sides of the sensing elements are summed and presented to an amplifier which also receives the regulator's output voltage, to produce an output which is proportional to the regulator's total output current Iout. The invention also provides a means for direct insertion of total inductor output current information into a regulator's voltage-mode control loop, to provide active voltage positioning (AVP) for the output voltage. A voltage based on total inductor output current is summed with the regulator's reference voltage; this sum and Vout are applied to the voltage control error amplifier, the output of which is processed to operate the regulator's switches. This enables the regulator's output to have a desired droop impedance and to provide AVP of Vout as a function of total filtered inductor output current Iout(fltr).