Switch mode power supply, control circuit and associated control method
Granted: January 12, 2016
Patent Number:
9236801
A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch, a second switch and a control circuit. The control circuit is configured to provide a first switching control signal to turn ON and turn OFF the first switch, and when the switch mode power supply works in a power saving mode, the first switch is turned ON if a voltage feedback signal is less than a reference voltage and a current flowing through…
Charge pump and method of having negative output voltage tracking positive output voltage thereof
Granted: January 12, 2016
Patent Number:
9236796
A method having a negative output voltage at a negative output terminal of a charge pump tracking a positive output voltage at a positive output terminal of the charge pump. The charge pump comprises a plurality of switches and each of the plurality of switches has a serially coupled resistance. The method comprises selecting the serially coupled resistance for at least one of the plurality of switches to be different to each of the other respective serially coupled resistances…
Switch-mode power supply, control circuit and associated dimming method
Granted: January 5, 2016
Patent Number:
9232606
A switch-mode power supply and associated control circuit for a light-emitting device are disclosed. The switch-mode power supply having a first switch which is turned ON or OFF by a control signal. The control circuit having an error amplifier, a minimum-off time control circuit and a logic circuit, wherein the error amplifier is configured to provide a compensation signal based on a dimming signal and a feedback signal. The minimum-off time control circuit is configured to provide a…
Power converter, clock module and associated control method
Granted: January 5, 2016
Patent Number:
9231574
A power converter and a clock module employed for providing a clock signal to the power converter. The power converter converts an input voltage to an output voltage based on at least the switching on and off of a main switch. The clock module monitors a deviation of the output voltage from its desired value and compares the deviation with a predetermined threshold window to provide a clock control signal. The clock module further regulates the clock signal in response to the clock…
High voltage circuit layout structure
Granted: January 5, 2016
Patent Number:
9231121
A high voltage circuit layout structure has a P-type substrate; a first N-type tub, a second N-type tub, a third N-type tub, a first P-type tub with a first width and a second P-type tub with a second width formed on the P-type substrate; wherein the first P-type tub is formed between the first N-type tub and the second N-type tub; and the second P-type tub is formed between the second N-type tub and the third N-type tub.
Junction field effect transistors and associated fabrication methods
Granted: January 5, 2016
Patent Number:
9230956
A JFET having a semiconductor substrate of a first doping type, an epitaxial layer of the first doping type located on the semiconductor substrate, a body region of a second doping type located in the epitaxial layer, a source region of the first doping type located in the epitaxial layer, a gate region of the second doping type located in the body region, and a shielding layer of the second doping type located in the epitaxial layer, wherein the semiconductor substrate is configured as…
Failure detector circuit and associated method
Granted: December 22, 2015
Patent Number:
9219468
A failure detector circuit for detecting status of a protected circuit, the failure detector circuit having an operating cycle, has an enabling signal generator, a comparator circuit, a delay circuit. The enabling signal generator enables the comparator for an enable time in each operating cycle. The comparator circuit compares an output of the protected circuit with a reference signal. The delay circuit receives an output signal of the comparator to decide whether a failure occurred…
High voltage PMOS and the method for forming thereof
Granted: December 22, 2015
Patent Number:
9219146
A high voltage PMOS replacing the lightly doped region of the drain region with a low voltage P-well adopted in the low voltage devices, so as to save a mask. In order to achieve the high breakdown voltage and the low on resistance, a thick gate oxide applied in the DMOS is inserted. The N-type well region surrounding the source region may be replaced by a low voltage N-well adopted in the low voltage device to further save a mask.
LED backlight driver system and associated method of operation
Granted: December 15, 2015
Patent Number:
9215769
The embodiments of the present circuit and method disclose a light-emitting diode (LED) driver system. The LED driver system may comprise an isolated converter and a DC/DC converter. The isolated converter may be coupled to a first input signal, and may provide a LED current and a bus voltage. The isolated converter may be configured to regulate the LED current and the bus voltage separately in accordance with a dimming signal. The DC/DC converter may comprise an input coupled to the bus…
AC signal detector and the method thereof
Granted: December 1, 2015
Patent Number:
9201102
An AC signal detector having: a rectify circuit having a first input terminal and a second input terminal configured to receive an AC signal, and an output terminal configured to provide a rectified signal based on the AC signal; a detecting circuit having an input terminal coupled to the output terminal of the rectify circuit to receive the rectified signal, and an output terminal configured to provide a square signal based on the rectified signal; and an unplug indicate circuit having…
Current detection and emulation circuit, and method thereof
Granted: November 10, 2015
Patent Number:
9184651
A current detection circuit for detecting a current in a SMPS which has a first switch and a second switch; a current sensing circuit sensing a second switch current flowing through the second switch and providing a current sensing signal; and a current emulation circuit which generates a first current according to the current sensing signal and generate a second current according to the first current source, and the current emulation circuit further providing a current emulation signal…
Phase-shift dimming for LED controller and the method thereof
Granted: November 3, 2015
Patent Number:
9179519
A phase-shift dimming circuit for LED controller having a delay signal generator configured to receive a PWM input signal, and to provide a plurality of pairs of set signal and reset signal, the set signal and the reset signal respectively having pulses; and a plurality of latches configured to respectively receive the plurality of pairs of set signal and reset signal to generate a plurality of PMW output signals, each of the PWM output signals having pulses, and wherein the rising edge…
Charge-pump voltage divider and associated control method
Granted: October 27, 2015
Patent Number:
9172300
The embodiments of the present invention disclose a charge-pump voltage divider and associated start-up method. The charge-pump voltage divider comprises a start-up circuit that can regulate an inrush current during start up. The start-up circuit comprises a switch, which operates in linear region state during start-up, and operates in switching state after the start-up completes. The charge-pump voltage divider may further comprise a load control switch configured to ensure the start-up…
High side DMOS and the method for forming thereof
Granted: October 13, 2015
Patent Number:
9159795
A high side DMOS provides high breakdown voltage with small termination area. The high side DMOS has three parts which may comprise a stair-field plate in the termination part of the poly gate.
Discharge circuits for EMI filters capacitors and methods thereof
Granted: September 29, 2015
Patent Number:
9148049
A discharge circuit for an EMI filter capacitor, wherein the EMI filter capacitor is coupled between input terminals of a switching converter. The discharge circuit has a detecting circuit and a current source. The detecting circuit is configured to detect whether an electrical source is coupled to the input terminals of the switching converter. The current source is coupled between the input terminals of the switching converter and a power supply capacitor, and is configured to provide…
Power factor correction circuit, the control circuit and the method thereof
Granted: September 8, 2015
Patent Number:
9130473
A power factor correction circuit including a rectifier bridge, an energy storage component, a power switch, a second switch and a control circuit provides reduced THD and improved PF performance under a high input AC voltage.
Switching power converter and control method thereof
Granted: August 25, 2015
Patent Number:
9118258
A switching power converter with an input terminal configured to receive a first input voltage; an output terminal configured to provide an output current to a load, wherein the output current has a peak value and an average value; a power switch; a first loop coupled to the input terminal, wherein the first loop configured to generate a first output signal based on the first input voltage; a second loop configured to generate a second output signal based on the output current; a…
High side buck converters and control methods thereof
Granted: August 11, 2015
Patent Number:
9106131
A high side buck converter includes a high side transistor, a low side transistor, a sensor, a sensing window generator, an error amplifier, a first comparator and an on-time signal generator. The high side and low side transistors are coupled together to form a switch node which is used as the reference ground of the controller. The sensor senses the output voltage and generates a sensing signal. The sensing window generator generates a sensing window signal. The error amplifier…
Power converter with voltage window and the method thereof
Granted: July 28, 2015
Patent Number:
9093903
The present disclosure discloses a power converter providing a low output voltage from an offline AC. The power converter defines a voltage window for the input AC signal. Inside the voltage window, the rectified DC waveform is passed through to the output and the storage capacitor; outside the voltage window, the power converter is idle (or the output is blocked from input) and let the output storage capacitor alone supply the load.
Switching mode power supply and the method thereof
Granted: July 28, 2015
Patent Number:
9093909
A switching mode power supply, having: an input port; an output port; an energy storage component and a pair of power switches coupled between input port and the output port; an error amplifier configured to generate an amplified error signal based on the feedback signal and the reference signal; an error comparator configured to generate a frequency control signal based on the amplified error signal and the first sawtooth signal; a peak current generator configured to generate a peak…
