Two switch off-line switching converter
Granted: December 21, 1999
Patent Number:
6005781
A power supply comprises a first coupled to receive AC mains power that provides a first power level, a second stage that receives the first power level and that provides a second power level, a third stage that receives the first power level that provides a third power level, and a pulse width modulated switching block comprising a first modulation input, a second modulation input, the first modulation input receives a signal indicative of a voltage, current or power at the second stage…
Two switch off-line switching converter
Granted: November 9, 1999
Patent Number:
5982639
A power supply comprises a bridge rectifier with an input and an output, the input of the bridge rectifier coupled to an AC power supply signal, the output comprising positive and negative terminals; a first inductor comprises a first terminal and a second terminal, the first terminal coupled to the positive terminal of the output of the bridge rectifier; a first switch comprises a first terminal, a second terminal and a control terminal, the first terminal of the switch coupled to the…
Coupled inductor power supply with reflected feedback regulation circuitry
Granted: October 26, 1999
Patent Number:
5973945
A power supply for supplying power to a load comprises a coupled inductor having a primary winding, at least one secondary winding, and a regulation circuit coupled to the primary winding that allows current or voltage to be supplied to the coupled inductor for a time duration, An error detection circuit is coupled to the secondary winding to compare a voltage or current supplied to the load against at least one threshold. Upon exceeding the threshold, the error detection circuit alters…
Low-cost, high-voltage, flyback power supply
Granted: February 11, 1997
Patent Number:
5602724
A low-cost, high-voltage, flyback power supply comprising two switching transistors connected in series with the primary winding of the transformer. Such a power supply also comprises a clamping circuit in parallel with the primary of the transformer.
Plastic quad-packaged switched-mode integrated circuit with integrated transformer windings and mouldings for transformer core pieces
Granted: November 21, 1995
Patent Number:
5469334
A switching power supply embodiment of the present invention includes a plastic leaded chip carrier (PLCC) that has two rectangular holes joined by a channel on the bottom surface that allow the PLCC to be surface mounted on a printed circuit board over a ferrite U-core section. A ferrite I-core section caps the ends of the U-core section above the top surface of the PLCC. A wire frame within the PLCC provides for several individual parallel conductor segments that pass between the two…
Power factor correction precompensation circuit
Granted: October 24, 1995
Patent Number:
5461303
An embodiment of the present invention is a boost preregulator circuit which includes a bridge rectifier, an inductor, a boost diode and an output capacitor. A power transistor is switched on and off across a junction of the boost inductor and boost rectifier according to a variable duty cycle. Proper variation of the duty cycle results in a power factor corrected AC line current waveform with an in-phase sinusoidal shape.
Method of making high voltage transistor
Granted: May 2, 1995
Patent Number:
5411901
In a method for constructing a semiconducting device, within a substrate of a first conductivity type there is formed a well of second conductivity type. Within the well, an extended drain region of a first conductivity type is formed. An insulating region over the extended drain region is formed. A gate region is formed on a surface of the substrate. A first side of the gate region is adjacent to a first end of the extended drain region. A drain region of the first conductivity type is…
Bi-directional MOSFET switch
Granted: June 21, 1994
Patent Number:
5323044
A bi-directional switch includes a well region of a first conductivity type placed within a substrate. A first region of second conductivity type is placed within the well. A second contact region of second conductivity type is placed within the well. A drift region of second conductivity is placed between the first contact and the second contact. The drift region is separated from the first contact by a first channel region and is separated from the second contact by a second channel…
High voltage MOS transistor with a low on-resistance
Granted: May 17, 1994
Patent Number:
5313082
An embodiment of the present invention is an improved insulated-gate, field-effect transistor and a three-sided, junction-gate field-effect transistor connected in series on the same chip to form a high-voltage MOS transistor. An extended drain region is formed on top of a substrate of opposite conductivity material. A layer of material with a conductivity opposite to that of the material of the extended drain region is buried within the extended drain region such that field-effect…
Three-terminal switched mode power supply integrated circuit
Granted: May 17, 1994
Patent Number:
5313381
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 voltage within the chip by sensing the excess current flowing through a shunt regulator.
Linear load circuit to control switching power supplies under minimum load conditions
Granted: February 8, 1994
Patent Number:
5285367
An embodiment of the present invention is a switching power supply comprising a transformer with a primary and two secondaries, a switching transistor in series with the primary, a rectifier and filter on one secondary to provide regulated output power, a feedback control circuit that monitors the secondary and adjusts the duty cycle of an on-off control signal to the switching transistor to maintain a constant output at the terminals, and a monitor that detects when the power level…
Switched mode power supply integrated circuit with start-up self-biasing
Granted: February 8, 1994
Patent Number:
5285369
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 MOSFET with a low voltage tap in the drift region. The MOSFET controls power switching of the primary winding of the transformer and has a high voltage present during initial power-up. This high…
Power MOSFET safe operating area current limiting device
Granted: January 25, 1994
Patent Number:
5282107
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 MOSFET with a low voltage tap in the drift region. The MOSFET controls power switching of the primary winding of the transformer and has a high voltage present during initial power-up. This high…
High voltage transistor
Granted: December 28, 1993
Patent Number:
5274259
In a method for constructing a semiconducting device, within a substrate of a first conductivity type there is formed a well of second conductivity type. Within the well, an extended drain region of a first conductivity type is formed. An insulating region over the extended drain region is formed. A gate region is formed on a surface of the substrate. A first side of the gate region is adjacent to a first end of the extended drain region. A drain region of the first conductivity type is…
Dual threshold differential discriminator
Granted: December 28, 1993
Patent Number:
5274274
An embodiment of the present invention is a high-side driver comprising a pair of differential input controls each of which are coupled to a pair of comparators having first and second thresholds set at Vddh-1.5 volts and Vddh-2.5 volts, respectively. A logic block in front of a set-reset flip-flop recognizes only signals on the dual-input control lines where one is less than the Vddh-1.5 volt threshold and the other exceeds the Vddh-2.5 volt threshold. If signals on either or both of…
Narrow radius tips for high voltage semiconductor devices with interdigitated source and drain electrodes
Granted: November 2, 1993
Patent Number:
5258636
A field effect transistor (FET), according to the present invention, comprises a source and drain pair of electrodes having non-uniform charge distributions between them, such as results from small radius tips, and has a gate and channel structure that exists only between points of the source and drain pair that have the less intense charge distributions, e.g., areas not involving any small radius tips. The gate and channel structure is such that, given the non-uniform charge…
Below ground current sensing with current input to control threshold
Granted: September 14, 1993
Patent Number:
5245526
An embodiment of the present invention is a switching power supply with high voltage positive and negative power inputs, a system ground, a sensing resistor placed between the negative power input and system ground, first and second load outputs with the first load output connected to the positive power input, and a comparator having first and second comparison inputs and a comparison output with the second comparison input connected to the system ground. A constant-current source is…
Low noise voltage regulator and method using a gated single ended oscillator
Granted: November 17, 1992
Patent Number:
5164891
A voltage regulator generates an output voltage between an output line and an output reference voltage from an input voltage between an input line and an input reference voltage. The voltage regulator combines a self excited series resonant oscillator and a switching regulator control circuit. The self excited series resonant oscillator includes an oscillator circuit which produces an oscillating signal. The oscillating signal is rectified to produce a rectified signal. The rectified…
High frequency switched mode converter
Granted: November 3, 1992
Patent Number:
5161098
A small, lightweight, efficient, very low cost AC adaptor for consumer electronics applications is realized by combining a switching regulator integrated circuit along with a leadframe adapted to mount the switching regulator integrated circuit off-center, a single-sided printed circuit board and high frequency ferrite cores. These components are assembled onto a substrate, such as a printed circuit board, by means of well-known, low-cost automatic insertion assembly machines. The novel…
MOS gated bipolar transistor
Granted: December 10, 1991
Patent Number:
5072268
A high voltage transistor includes a substrate of a first conductivity type. Within the substrate is a well region of a second conductivity type. A source region is within the substrate and adjoins the substrate surface. The source region includes a pocket of semiconductor material of the first conductivity type and a pocket of semiconductor material of the second conductivity type. A drain region is placed within the well region and adjoins the substrate surface. The drain region…
