Fairchild Semiconductor Patent Applications

ADAPTIVE CLAMPING CIRCUITRY

Granted: January 12, 2017
Application Number: 20170012545
The present disclosure provides A DC/DC power supply system that includes a primary side and a secondary side to generate an output DC voltage from an input DC voltage. The power supply also includes adaptive clamping circuitry configured to generate an adjustable clamping voltage and/or current to limit a Vds breakdown voltage for a plurality of switches of the secondary side.

CONTROL OF A STARTUP CIRCUIT USING A FEEDBACK PIN OF A PWM CONTROLLER INTEGRATED CIRCUIT CHIP

Granted: January 5, 2017
Application Number: 20170005583
A power supply includes a control transistor that controls a primary winding of a transformer to induce current on a secondary winding of the transformer to generate an output voltage. A pulse width modulation (PWM) controller integrated circuit (IC) chip drives the control transistor through a gate pin. The PWM controller IC chip has a feedback pin that receives a feedback signal indicative of the output voltage. A high voltage (HV) startup transistor is controlled through the feedback…

CHARGE PUMP CIRCUIT FOR PROVIDING VOLTAGES TO MULTIPLE SWITCH CIRCUITS

Granted: October 27, 2016
Application Number: 20160315534
A charge pump circuit generates a charge pump voltage that powers a bias circuit. The bias circuit generates a reference current and generates switch currents from the reference current. Gate-source voltages are generated from the switch currents and applied to switching components of switch circuits to connect two nodes. The gate-source voltages can be generated in the bias circuit and provided to the switch circuits. The gate-source voltages can also be generated in the switch…

ARTIFICIAL RIPPLE MODULATION CONTROL CIRCUITRY

Granted: September 29, 2016
Application Number: 20160285368
In one embodiment the present disclosure provides a power supply system that includes power switch circuitry configured to switch an input voltage to generate a switched input voltage; output circuitry including an inductor to generate an output voltage from the switched input voltage; and pulse width modulation (PWM) controller circuitry configured to generate a PWM signal to control the power switch circuitry; wherein the PWM controller circuitry is further configured to turn OFF the…

POWER SUPPLY WITH LINE COMPENSATION CIRCUIT

Granted: September 8, 2016
Application Number: 20160261196
A line compensation circuit for a power supply includes a line voltage sense circuit and a current limit adjuster. The line voltage sense circuit senses a slope of an inductor current by way of a compensation capacitor that receives a sense voltage that is representative of the inductor current on a primary side of the power supply. A compensation current that is generated from the compensation capacitor is used by the current limit adjuster to adjust an output current limit of the power…

POWER SUPPLY WITH NEAR VALLEY SWITCHING

Granted: September 8, 2016
Application Number: 20160261201
A switched-mode power supply with near valley switching includes a quasi-resonant converter. The converter includes a switch element that is turned on not only at the valley, but also in a window range of ?tNVW close to the valley, where the voltage across the switch element is at its minimum. This advantageously reduces switching loss and maintains a balance between efficiency and frequency variation.

ADAPTIVE OVERVOLTAGE PROTECTION FOR ADAPTIVE POWER ADAPTERS

Granted: August 18, 2016
Application Number: 20160241016
A power adapter includes a protocol integrated circuit (IC) on a secondary side of a transformer and a controller IC on a primary side of the transformer. The power adapter has an output voltage that changes depending on the charging voltage requirement of an electronic device (e.g., mobile device) connected to receive power from the power adapter. The power adapter includes an adaptive overvoltage protection mode that sets an overvoltage protection threshold to a low level during…

BATTERY CHARGING SYSTEM INCLUDING CURRENT OBSERVER CIRCUITRY TO AVOID BATTERY VOLTAGE OVERSHOOT BASED ON BATTERY CURRENT DRAW

Granted: June 23, 2016
Application Number: 20160181834
According to one aspect of the present disclosure, there is provided a battery charging system. The battery charging system includes battery charging circuitry configured to provide charging current to a battery. The battery charging system further includes feedback circuitry configured to generate a feedback signal indicative of a battery charging condition, wherein the battery charging system is configured to control the battery charging current based on, at least in part, the feedback…

AUDIO SWITCH CIRCUIT WITH SLOW TURN-ON

Granted: June 23, 2016
Application Number: 20160182040
An audio switch circuit includes negative feedback paths and a transistor that serves as a switching component. The negative feedback paths are turned ON to couple a source voltage and a drain voltage of the transistor to the gate of the transistor when the audio switch circuit is turned ON. The negative feedback paths reduce the slew rate of the gate-to-source voltage of the transistor, thereby slowing the turn-ON of the audio switch circuit to prevent or minimize unwanted audible…

SWITCH DEVICE WITH SWITCH CIRCUITS THAT PROVIDE HIGH VOLTAGE SURGE PROTECTION

Granted: June 16, 2016
Application Number: 20160173084
A switch device includes a common node that is connected to end nodes, such as that of computer interface ports. The switch device includes several switch circuits that can be connected in series to form a switch path between the common node and an end node. A switch circuit can include a main switch, such as a transistor that can be configured to withstand a positive or negative voltage surge by automatically changing the connection of its gate.

CHARGE PUMP CIRCUIT FOR PROVIDING VOLTAGES TO MULTIPLE SWITCH CIRCUITS

Granted: June 9, 2016
Application Number: 20160164401
A charge pump circuit generates a charge pump voltage that powers a bias circuit. The bias circuit generates a reference current and generates switch currents from the reference current. Gate-source voltages are generated from the switch currents and applied to switching components of switch circuits to connect two nodes. The gate-source voltages can be generated in the bias circuit and provided to the switch circuits. The gate-source voltages can also be generated in the switch…

FULL BRIDGE DC/DC CONVERTER CONTROL TECHNIQUES

Granted: December 17, 2015
Application Number: 20150365000
The present disclosure describes full bridge power supply systems and control methods. In at least one embodiment, the full bridge power supply system may be driven utilizing a two-phase continuous conduction switching mode to control the inductor current. In another embodiment, the full bridge power supply system may be driven utilizing variably-configured three-phase continuous conduction modes to control the inductor current when an input voltage is within a window value to the output…

OVERCURRENT DETECTION CIRCUIT AND METHOD, LOAD SWITCH, AND PORTABLE DEVICE

Granted: August 27, 2015
Application Number: 20150244164
The present invention provides an overcurrent detection circuit, an overcurrent detection method, a load circuit, and a portable device. The overcurrent detection circuit comprises: a first overcurrent detection sub-circuit and a second overcurrent detection sub-circuit; wherein: the first overcurrent detection sub-circuit is configured to perform overcurrent detection for a switch circuit when a voltage of an output terminal of the switch circuit is greater than or equal to a preset…

SIC BIPOLAR JUNCTION TRANSISTOR WITH REDUCED CARRIER LIFETIME IN COLLECTOR AND A DEFECT TERMINATION LAYER

Granted: April 30, 2015
Application Number: 20150115283
A method of manufacturing a silicon carbide (SiC) bipolar junction transistor (BJT) and a SiC BJT (100) are provided. The SiC BJT comprises an emitter region (150), a base region (140) and a collector region (120). The collector region is arranged on a substrate (110) having an off-axis orientation of about 8 degrees or lower. A defect termination layer (DTL, 130) for terminating dislocations originating from the substrate is arranged between the substrate and the collector region. The…

LOAD DRIVING METHOD, LOAD DRIVING CIRCUIT, AND APPLICATION DEVICES THEREOF

Granted: March 26, 2015
Application Number: 20150084895
The present invention discloses a load driving circuit, comprising a voltage differential generation circuit and a common mode voltage generation circuit; wherein the voltage differential generation circuit is configured to generate a driving voltage for driving a load; and the common mode voltage generation circuit is configured to: when the voltage differential generation circuit generates the driving voltage for driving the load, regulate the voltages output by a first output terminal…

CHARGING CONTROL CIRCUIT, METHOD AND ELECTRONIC DEVICE THEREOF

Granted: February 5, 2015
Application Number: 20150035369
The present invention discloses a charging control circuit, comprising an external power source, a switching circuit, and a charging path circuit comprising a first output circuit and a second output circuit, wherein the external power source is configured to charge a secondary battery through the first output circuit and charge a load through the second output circuit, and the switching circuit is configured to decouple the secondary battery from the load when the external power source…

DIFFERENTIAL MEASUREMENTS WITH A LARGE COMMON MODE INPUT VOLTAGE

Granted: January 15, 2015
Application Number: 20150015333
An apparatus comprises a differential amplifier circuit and a current source. The differential amplifier circuit is configured to receive a voltage at an input, wherein the differential amplifier circuit generates an output voltage having a magnitude proportional to the received voltage over a voltage range to be measured at a specified output common mode voltage. The current source is electrically connected to an input of the differential amplifier circuit and is configured to subtract…

System for Battery Management and Protection

Granted: December 4, 2014
Application Number: 20140354238
The present disclosure is directed to a system for battery management and protection. A battery protection circuit may include a power semiconductor switch and a control integrated circuit (IC). The battery protection circuit may be configured to regulate the charging and/or discharging of a battery and further prevent the battery from operating outside of a safe operating area based on a protection trip point (e.g. overcurrent detection point) of the protection IC. The protection IC may…

HEATED ACCELERATED BATTERY CHARGING

Granted: November 13, 2014
Application Number: 20140333267
This document discusses, among other things, a temperature measurement component configured to receive temperature information from a battery, a heater configured to provide heat to the battery, and a controller configured to enable and disable the heater using information from the temperature measurement component to optimize charge efficiency and capacity of the battery.

MONOLITHIC IGNITION INSULATED-GATE BIPOLAR TRANSISTOR

Granted: September 18, 2014
Application Number: 20140264434
In a general aspect, an apparatus can include an insulated-gate bipolar transistor (IGBT) device disposed in a semiconductor region. The apparatus can further include a plurality of clamping diodes. The plurality of clamping diodes can be coupled in series between a collector terminal of the IGBT device and a gate terminal of the IGBT device. The apparatus can also include a gate pad disposed over at least a portion of the plurality of clamping diodes. The at least a portion of the…