1
Balakrishnan Balu: Three-terminal switched mode power supply integrated circuit.. Power Integrations, March 9, 1994: EP0585789-A1 (69 worldwide citation)

An embodiment of the present invention is a three-terminal switched mode power supply chip with a signal terminal for accepting a combination of a feedback control signal and bias supply voltage to operate the chip. A feedback extraction circuit separates the feedback signal from the power supply vo ...


2
Balakrishnan Balu, Djenguerian Alex B, Matthews David Michael Hugh: Method and apparatus for trimming current limit and frequency to maintain a constant maximum power. Power Integrations, March 5, 2003: EP1289107-A2 (24 worldwide citation)

The invention disclosed relates to methods and apparatuses to trim current limit (Ip) and frequency (f) to maintain a constant maximum power. In one aspect of the invention, a power supply regulator (321) having a peak current limit detection threshold and an operating frequency is disclosed. The pe ...


3
Balakrishnan Balu, Djenguerian Alex B, Wong Kent: Method and apparatus for reducing audio noise in a switching regulator. Power Integrations, February 13, 2002: EP1179884-A2 (23 worldwide citation)

A switching regulator 139 utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine 301 that adjust the current limit 305 of the switching regulator 139 based on a patt ...


4
Balakrishnan Balu: Switched mode power supply integrated circuit with start-up self-biasing.. Power Integrations, March 9, 1994: EP0585788-A1 (18 worldwide citation)

An embodiment of the present invention is a switching power supply that includes a full-wave bridge rectifier to rectify incoming AC line voltage, a transformer having a primary winding and two secondary windings and a switched mode power supply chip that includes an integrated high voltage power MO ...


5
Balakrishnan Balu, Djenguerian Alex, Wong Kent, Matthews David Michael Hugh: Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply. Power Integrations, April 2, 2003: EP1298778-A2 (13 worldwide citation)

A power supply including a regulation circuit that maintains an approximately constant load current with line voltage, In one embodiment, a regulation circuit includes a semiconductor switch and current sense circuitry to sense the current in the semiconductor switch. The current sense circuitry has ...


6
Balakrishnan Balu: Integrated backplane interconnection architecture.. Balakrishnan Balu, June 3, 1992: EP0488057-A1 (13 worldwide citation)

A backplane, provides a physical layer level interconnection between a plurality of modules. The backplane includes a physical layer implementation of an interconnection topology incorporated within one or more integrated circuits called interconnect chips. Incorporated on the interconnect chips are ...


7
Balakrishnan Balu, Lund Leif O, Keller Richard A: Below ground current sensing with current input to control threshold.. Power Integrations, August 25, 1993: EP0556663-A1 (11 worldwide citation)

A switching power supply with high voltage positive and negative terminals (41, 42), a system ground (45), a sensing resistor (54) placed between the negative terminal (42) and system ground (45), a load connected to the positive terminal (41), and a comparator (60) having first and second compariso ...


8
Matthews David Michael Hugh, Djenguerian Alex B, Wong Kent, Balakrishnan Balu: Method and device for selecting parameter/mode based on time measurement. Power Integrations, March 22, 2007: JP2007-073954 (6 worldwide citation)

PROBLEM TO BE SOLVED: To provide a technique for selecting functional parameters and/or operating modes of a circuit based on a time measurement.SOLUTION: An example of an integrated circuit includes a threshold detection and timing circuit that is coupled to measure a signal from a multifunction ca ...


9
Balakrishnan Balu: Method and apparatus for fault condition protection of a switched mode power supply. Power Integrations, September 18, 2002: EP1241778-A2 (5 worldwide citation)

Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit (101) having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one embodiment, one or more off-t ...


10
Matthews David Michael Hugh, Djenguerian Alex B, Wong Kent, Balakrishnan Balu: Method and apparatus to select a parameter/mode based on a time measurement. Power Integrations, February 28, 2007: EP1758234-A2 (5 worldwide citation)

Techniques are disclosed to select functional parameters and/or operating modes of a circuit based on a time measurement are disclosed. One example integrated circuit (303) includes a threshold detection and timing circuit (349) that is coupled to measure a signal during an initialization period of ...