Assignee: System General Corp.

Location: Taipei Hsien, TW
No. of patents: 135

Number	Title	Issue Date
8124466	Process for manufacturing voltage-controlled transistor The present invention provides a self-driven LDMOS which utilizes a parasitic resistor between a drain terminal and an auxiliary region. The parasitic resistor is formed between two depletion boundaries in a quasi-linked deep N-type well. When the two depletion boun...	02/28/2012
8094468	Control circuit having off-time modulation to operate power converter at quasi-resonance and in continuous current mode A control circuit is developed to adaptively operate a power converter at quasi-resonance (QR) and in a continuous current mode (CCM) to achieve high efficiency. The control circuit includes a PWM circuit generating a switching signal coupled to switch a transformer...	01/10/2012
8089791	Compensation circuit and compensation method for current mode power converters A compensation circuit and a compensation method for providing compensation of a power converter are proposed. A current sense circuit is coupled to receive a switching current for generating a current signal. A signal generation circuit is developed to generate a f...	01/03/2012
8085021	PFC converter having two-level output voltage without voltage undershooting A switching controller for a PFC converter is provided. The switching controller comprises a switching-control circuit, a current-command circuit, a programmable feedback circuit, a modulator, an over-voltage detection circuit, and a light-load detection circuit. Th...	12/27/2011
RE43015	Capacitive high-side switch driver for a power converter The present invention discloses a capacitive high-side switch driver for a power converter. The capacitive high-side switch driver according to the present invention includes an inverter and two alternately conducting totem-pole buffers with complementary duty cycle...	12/13/2011
8054656	Switching control circuit for a switching power converter A switching control circuit is coupled to a switching device and an auxiliary winding of a transformer, wherein a primary winding of the transformer is coupled to the switching device. The switching control circuit includes a voltage receiver, a comparing unit and a...	11/08/2011
8045351	Method and apparatus of providing a biased current limit for limiting maximum output power of power converters A biased current-limit circuit for limiting a maximum output power of a power converter includes an oscillator for generating a pulse signal. A waveform generator generates a waveform signal in response to a switching signal and a second-sampling signal. A sample-ho...	10/25/2011
8044685	Floating driving circuit A floating driving circuit according to the present invention comprises an input circuit to receive an input signal. A latch circuit receives a trigger signal for generating a latch signal. The latch signal is used to turn on/off a switch. A coupling capacitor is co...	10/25/2011
8023289	Offline synchronous rectifier with causal circuit for resonant switching power converter A synchronous rectifier of a resonant switching power converter is provided to improve efficiency. The synchronous rectifier includes a power transistor and a diode connected to a transformer and an output of the resonant switching power converter for ratifications....	09/20/2011
RE42674	Control method and circuit with indirect input voltage detection by switching current slope detection The present invention provides a method and a control circuit to detect an input voltage for the control and protections of a power converter. It includes a current sense circuit for generating a current signal in response to a switching current of a transformer. A ...	09/06/2011
7999527	Switching controller having programmable feedback circuit for power converters A switching controller for a boost power converter includes a switching-control circuit and a programmable feedback circuit. The programmable feedback circuit is coupled to an output of the boost power converter via a voltage divider. The programmable feedback circu...	08/16/2011
7995358	Control circuit including adaptive bias for transformer voltage detection of a power converter A control circuit is developed to detect a flyback voltage of a transformer of a power converter. The control circuit comprises a switch, a detection circuit and a switching circuit. The switch is coupled to the transformer for switching the transformer. The detecti...	08/09/2011
7974108	Synchronous rectifying circuit for offline power converter A synchronous rectifying circuit is provided for power converter. An integrated synchronous rectifier has a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to secondary side of a transform...	07/05/2011
7944721	Switching control circuit for multi-channels and multi-phases power converter operated at continuous current mode A switching control circuit for multi-channels and multi-phases power converter according to the present invention comprises a master control circuit and a slave control circuit. The master control circuit generates a multiplier signal in response to an input voltag...	05/17/2011
7936087	Switching controller for parallel power converters A switching controller for parallel power converters is disclosed. The switching controller includes an input circuit coupled to an input terminal of the switching controller to receive an input signal. An integration circuit is coupled to the input circuit to gener...	05/03/2011
7928758	Transistor gate driving circuit with power saving of power converter A transistor gate driving circuit is developed for power saving. It includes a first high-side transistor, a second high-side transistor and a low-side transistor. A voltage clamp device is connected to the gate terminal of the first high-side transistor to limit th...	04/19/2011
7923787	MOSFET with isolation structure and fabrication method thereof A MOSFET with an isolation structure is provided. An N-type MOSFET includes a first N-type buried layer and a P-type epitaxial layer disposed in a P-type substrate. A P-type FET includes a second N-type buried layer and the P-type epitaxial layer disposed in the P-t...	04/12/2011
7911813	Offline synchronous rectifying circuit with sense transistor for resonant switching power converter A synchronous rectifying circuit of a resonant switching power converter is provided to improve the efficiency. The synchronous rectifying circuit includes a power transistor and a diode connected to a transformer and an output ground of the power converter for rect...	03/22/2011
7903440	Synchronous regulation circuit and method for providing synchronous regulation for power converters A synchronous regulation circuit is provided to improve the efficiency of the power converter. A primary-side switching circuit generates a synchronous signal and a switching signal. The switching signal is used for soft switching a transformer. A secondary-side swi...	03/08/2011
7903435	Switching controller having switching frequency hopping for power converter A switching controller having switching frequency hopping for a power converter includes a first oscillator generating a pulse signal and a maximum duty-cycle signal for determining a switching frequency of a switching signal, a pattern generator having a second osc...	03/08/2011
7885084	Control circuit for synchronous rectifying and soft switching of power converters A control circuit for soft switching and synchronous rectifying is provided for power converter. A switching-signal circuit is used for generating drive signals and a pulse signal in response to a leading edge and a trailing edge of a switching signal. The switching...	02/08/2011
7847533	Apparatus providing protection for power converter A switching circuit for a power converter includes an oscillation circuit, a first circuit, and a first comparator. The oscillation circuit generates a switching signal for regulating an output of the power converter. The first circuit generates a threshold signal. ...	12/07/2010
7847365	MOSFET with isolation structure for monolithic integration and fabrication method thereof A MOSFET device with an isolation structure for a monolithic integration is provided. A P-type MOSFET includes a first N-well disposed in a P-type substrate, a first P-type region disposed in the first N-well, a P+ drain region disposed in the first P-type region, a...	12/07/2010
7859234	Switch circuit to control on/off of a high voltage source A switch circuit to control a high voltage source is presented. It includes a JFET transistor, a resistive device, a first transistor and a second transistor. The JFET transistor is coupled to the high voltage source. The first transistor is connected in serial with...	12/28/2010
7858466	Different-voltage device manufactured by a CMOS compatible process and high-voltage device used in the different-voltage device A method of manufacturing different-voltage devices mainly comprises forming at least one high-voltage well in high-voltage device regions, at least one N-well in low-voltage device regions, at least one P-well in low-voltage device regions, source/drain wells in hi...	12/28/2010
7850217	Equidistance pick-and-place device for ICs An equidistance pick-and-place device for ICs is disclosed. It comprises a housing, a driving device, a guideway structure, a moving structure, a lazy tongs, a plurality of pick-and-place structures, and a transmission structure. The housing supports the equidistanc...	12/14/2010
7800927	Method and circuit for providing compensations of current mode power converters A method and circuit for providing compensation of a power converter is proposed. A current sense circuit is coupled to receive a switching current for generating a current signal. A signal generation circuit is developed to generate a first compensation signal and ...	09/21/2010
7800923	Offline synchronous switching regulator An offline synchronous switching regulator is proposed for improving the efficiency thereof. Switches are coupled to switch a transformer and generate a switching signal at a secondary side of the transformer. A switching circuit is coupled to an output of the regul...	09/21/2010
7796407	Method and apparatus of providing synchronous regulation for offline power converter A synchronous regulation circuit is provided to improve the efficiency for an offline power converter. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillatio...	09/14/2010
7787264	Apparatus to provide synchronous rectifying circuit for flyback power converters A synchronous rectifying circuit is provided for flyback power converter. A pulse generator is utilized to generate a pulse signal in response to a leading edge and a trailing edge of a switching signal. The switching signal is used for switching the transformer of ...	08/31/2010
7778051	Output current control circuit for power converter with a changeable switching frequency A control circuit controls the output current of the power converter at the primary side of the transformer. The control circuit includes a current-detection circuit for generating a primary-current signal in response to the switching current of the transformer. A v...	08/17/2010
7764098	Start up circuit of power converter A start up circuit of power converters is presented. It includes a first transistor, a resistive device, a second transistor, a third transistor and a diode. The first transistor is coupled to a voltage source. The third transistor is connected in serial with the fi...	07/27/2010
7755296	Resonant inverter The present invention provides a low-cost resonant inverter circuit for ballast. The resonant circuit includes a transformer connected in series with a lamp to operate the lamp. A first transistor and a second transistor are coupled to switch the resonant inverter c...	07/13/2010
7732890	Integrated circuit with high voltage junction structure The high voltage integrated circuit comprises a P substrate. An N well barrier is disposed in the substrate. Separated P diffusion regions forming P wells are disposed in the substrate for serving as the isolation structures. The low voltage control circuit is locat...	06/08/2010
7724034	Floating driving circuit A floating driving circuit according to the present invention comprises an input circuit to receive an input signal. A latch circuit receives a trigger signal for generating a latch signal. The latch signal is used to turn on/off a switch. A coupling capacitor is co...	05/25/2010
7701736	Synchronous rectifying circuit for resonant power converters A synchronous rectifying circuit is provided for resonant power converter. An integrated synchronous rectifier comprises a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to the secondary ...	04/20/2010
7701734	Detection circuit to detect input voltage of transformer and detecting method for the same A circuit and a method for detecting a voltage of a transformer are provided. The circuit includes a current output circuit coupled to a winding of a transformer to generate a current signal. A current-to-voltage circuit is coupled to the current output circuit to g...	04/20/2010
7701733	Method and apparatus to provide synchronous rectifying circuit for offline power converters A synchronous rectifying circuit is provided for power converter. A pulse signal generator is utilized to generate a pulse signal in response to the leading edge and the trailing edge of a switching signal. The switching signal is used for switching the transformer ...	04/20/2010
7671578	Detection circuit for sensing the input voltage of transformer A circuit for detecting an input voltage of a transformer is provided. The circuit includes a current source circuit coupled to a winding of a transformer. A current-to-voltage circuit is coupled to the current source circuit to generate a first voltage in response ...	03/02/2010
7671486	Switching controller having synchronous input for the synchronization of power converters A switching control circuit having a synchronous input for the synchronization of power converters is provided. It includes a synchronous input circuit for receiving a synchronous input signal. An oscillation circuit is connected to the synchronous input circuit for...	03/02/2010

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Assignee: System General Corp.