LED driver system, controller and associated method
Granted: May 17, 2016
Patent Number:
9345081
A LED driver system includes a LED converter converting an input voltage to an output voltage to drive a LED load via a main switch; a sensing circuit generating a feedback signal on the output terminal according to a load current through the LED load; an over-shoot detecting circuit generating an over-shoot signal according to the load current and a second reference signal; a logic circuit generating a switching signal according to a control signal and the over-shoot signal to control…
Switch mode power supply, control circuit and associated control method
Granted: May 3, 2016
Patent Number:
9331583
A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch and a control circuit. The control circuit is configured to provide a switching control signal to control the first switch. The control circuit is configured to provide the switching control signal based on a first pulse signal having a first frequency and a second frequency for a light load condition, and the control circuit is configured to…
Charger system, digital interface circuit and associated control method
Granted: May 3, 2016
Patent Number:
9331509
A charger system with a digital interface circuit, wherein the digital interface circuit has an N-bit control register, wherein N is a positive integer no less than 2, and wherein the N-bit register has a primary state machine, at a first portion of addresses of the control register, configured to instruct operation statuses of a system management bus host; and a secondary state machine, at a second portion of addresses of the control register, configured to instruct a data bit of…
Power supply with charge pump and control method
Granted: April 26, 2016
Patent Number:
9325237
The present invention provides a power supply comprising a driver and a charge pump. The driver is configured to provide a driving signal to a load. The charge pump comprises a first capacitor coupled to the load in parallel, at least one flying capacitor, a second capacitor and a switch array comprising a plurality of switches. The switch array is coupled to the first capacitor, the second capacitor and the at least one flying capacitor. The switch array receives the voltage across the…
Bootstrap refresh control circuit, power converter and associated method
Granted: April 12, 2016
Patent Number:
9312773
A power converter having a bootstrap refresh control circuit and a method for controlling the power converter. The bootstrap refresh control circuit is configured to monitor a bootstrap voltage across a bootstrap capacitor and to provide an enhanced high side driving signal to a high side switch of the power converter. The bootstrap refresh control circuit is further configured to controlling the charging of the bootstrap capacitor through regulating the on and off switching of the high…
Single inductor multiple output buck converter and control method thereof
Granted: April 12, 2016
Patent Number:
9312771
A single inductor multiple output buck converter includes an inductor having a first terminal and a second terminal, a first switch coupled between an input voltage and the first terminal of the inductor, a second switch coupled between the first terminal of the inductor and a reference ground, a third switch coupled between the second terminal of the inductor and a first output voltage, and a fourth switch coupled between the second terminal of the inductor and a second output voltage.…
Switch mode power supply control circuit to reduce overshoot of an output voltage
Granted: April 5, 2016
Patent Number:
9306451
A switch mode power supply having an output terminal configured to provide an output voltage which is regulated to an output target, the switch mode power supply has a first switch and a control circuit. When the output voltage increases to a first threshold voltage, the control circuit is configured to turn OFF the first switch until a time period expires.
Dimmer compatible LED driving apparatus with bleeding circuit
Granted: March 8, 2016
Patent Number:
9282606
An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a tank element, a first transistor, a second transistor, a free-wheeling switch, an output capacitor, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, and a bleeding control circuit generating…
Dimming mode detection method used in LED driving apparatus
Granted: March 8, 2016
Patent Number:
9282610
A dimming mode detection method is used in an LED driving apparatus including a rectifier bridge providing a DC bus voltage and a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED. The method involves: powering on the LED driving apparatus; sensing the DC bus voltage and generating a voltage sensing signal; comparing a rising time during which the voltage sensing signal increases from a second threshold voltage to a first threshold voltage…
Dimmer compatible LED driving apparatus with adjustable bleeding current
Granted: March 8, 2016
Patent Number:
9282609
An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED, a dimming mode detector detecting whether…
Super junction semiconductor device and associated fabrication method
Granted: March 8, 2016
Patent Number:
9281393
A semiconductor device with a substrate, an epitaxy layer formed on the substrate, a plurality of deep wells formed in the epitaxy layer, a plurality of trench gate MOSFET units each of which is formed in top of the epitaxy layer between two adjacent deep well, wherein a trench gate of the trench gate MOSFET unit is shallower than half of the distance between two adjacent deep wells, which may reduce the product of on-state resistance and the gate charge of the semiconductor device.
Digital controllers and digital control methods of multi-phase switching converters
Granted: February 23, 2016
Patent Number:
9270178
A method for controlling a multi-phase switching converter with a plurality of switching circuits, including: sensing the output current of the switching circuit and generating a current sensing signal; generating a digital phase current signal based on the current sensing signal; subtracting the digital phase current signal from a current reference signal and generating a current error signal; proportionally integrating the current error signal and generating a first bias signal;…
Constant on-time switching converter with internal ramp compensation and control method thereof
Granted: February 23, 2016
Patent Number:
9270176
A switching converter includes a main transistor, an inductor coupled to the main transistor, a feedback circuit configured to generate a feedback signal indicative of the output voltage and a controller configured to generate a control signal to control the main transistor. The controller has an on timer, a ramp generator, a comparing circuit and a logic circuit. The on timer is configured to generate an on-time control signal. The ramp generator is configured to generate a ramp signal,…
LED power supply with small dimming ratio control and control method thereof
Granted: February 16, 2016
Patent Number:
9265110
A LED driving control circuit for controlling a power switch in a LED power supply includes: a feedback circuit coupled to a LED load and generating a feedback signal indicative of an output voltage of the LED power supply; an enabling circuit generating an enable signal according to the feedback signal, a first reference signal and a PWM dimming signal, wherein when the feedback signal is higher than the first reference signal, the enable signal synchronizes with the PWM dimming signal,…
Short protection circuit for power switch and associated protection method
Granted: February 16, 2016
Patent Number:
9263937
A short protection circuit for protecting a power switch. The short protection circuit has a transistor and compares a differential voltage between a first end of the power switch and a second end of the power switch to a threshold voltage of the transistor only when the power switch is in an ON state; and wherein when the differential voltage is higher than the threshold voltage, the short protection circuit turns off the power switch.
Multi-phase switching converter with over current protection and control method thereof
Granted: February 16, 2016
Patent Number:
9263876
A multi-phase switching converter includes a plurality of switching circuits and a controller. The output terminals of the plurality of switching circuits are coupled together to provide an output voltage to a load. The controller is configured to generate a plurality of control signals to control the plurality of switching circuits. When an over current condition of a current switching circuit of the plurality of switching circuits is detected, the controller skips the current switching…
Load detecting circuits and the method thereof
Granted: February 2, 2016
Patent Number:
9252766
A no-load detecting circuit and the method thereof are disclosed. The no-load detecting circuit may be applied in switching mode power supplies or other circuits. The no-load detecting circuit comprises: a variable resistance circuit coupled in series to a load of the switching mode power supply; and a first comparison circuit coupled to the variable resistance circuit to receive the voltage across the variable resistance circuit, wherein based on the comparison of the voltage across the…
Power converter with active bleeding and ramp up-down delay and the method thereof
Granted: January 26, 2016
Patent Number:
9246404
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.
One-time programmable memory cell and circuit
Granted: January 26, 2016
Patent Number:
9245647
An OTP memory cell and an OTP memory circuit. The OTP memory cell having a memory module, a write module, a read module, and a load module. Data may be written into the memory module once the write module is active; and data may be read out of the memory module once the read module is active. The OTP memory cell may also have a first latch module and a second latch module.
LED driving circuit, control circuit and associated current sensing circuit
Granted: January 19, 2016
Patent Number:
9241381
A LED driving circuit, a control circuit and associated current sensing circuit. The control circuit has a sensing circuit, an estimation circuit, an amplifying circuit, a comparing circuit, a zero-cross detection circuit and a logic circuit. The sensing circuit is configured to sense a switching current flowing through at least one switch of a switching circuit to provide a first sensing signal. The estimation circuit is configured to process the first sensing signal to provide a…
