Patent application number | Description | Published |
20120120533 | CONTROLLERS, POWER SUPPLIES AND CONTROL METHODS - Power supplies together with related over voltage protection methods and apparatuses. A power supply has a transformer including a primary winding and an auxiliary winding. A power switch is coupled to the primary winding and a sensing resistor coupled between the power switch and a grounding line. A multi-function terminal of a controller is coupled to the sensing resistor. A diode and a first resistor is coupled between the auxiliary winding and the multi-function terminal. | 05-17-2012 |
20120140370 | Protection Circuit and Protection Method - A controller is applied with a protection circuit and a protection method. A controller detects an input signal generated by a current flowing through a detection resistor, thereby turning on or off a switch, for controlling the current. A shielding time generator provides a shielding time. When the switch is turned on and when a current timing without the shielding time, a short-circuit detector compares the input signal with a first reference voltage, thereby asserting a short-circuit detection signal. When the switch is turned off or when the current timing is during the shielding time, the short-circuit detection signal is not asserted. Each time the short-circuit detection signal is asserted, a logic controller turns off the switch, thereby reducing the current. | 06-07-2012 |
20130049706 | CIRCUIT FOR DISCHARGING AN X CAPACITOR - A circuit for discharging an X capacitor includes an AC detection unit, a reset unit, a counter, and a discharging unit. The AC detection unit is coupled to two terminals of the X capacitor through a pin. The AC detection unit has a plurality of reference levels for detecting a DC voltage level according to the plurality of reference levels, and outputting a detection signal. The reset unit is coupled to the AC detection unit for generating a reset signal according to the detection signal. The counter is coupled to the reset unit for being reset according to the reset signal. When the counter does not receive the reset signal within a first predetermined time, the counter generates a turning-on signal. The discharging unit is coupled to the counter for discharging the X capacitor according to the turning-on signal. | 02-28-2013 |
20130057243 | POWER CONTROLLER AND CONTROL METHOD FOR GENERATING ADAPTIVE DEAD-TIMES - A power controller has a high-side driver, a low-side driver, a voltage divider, and a comparator. The high-side driver drives a high-side power switch, powered by a boost power line and a connection node. The low-side driver drives a low-side power switch, powered by an operation power line and a ground power line. The voltage divider has a first resistor having a first node for providing a detection voltage and a second node coupled to the boost power line or the connection node. The voltage divider has a second resistor coupled between the first node of the first resistor and the ground power line. When the low-side power switch is turned off, the comparator compares the detection voltage with a reference voltage. When the detection voltage is higher than the reference voltage, the comparator renders to turn on the high-side power switch. | 03-07-2013 |
20130070486 | CONTROL METHODS AND CONTROLLERS - Control methods and controller thereof for a power supply including a power switch and an inductor. The power switch is turned on to increase the inductor current through the inductor, which is sensed to generate a current-sense signal. The current-sense signal is added up with an adjusting signal to generate a summation signal. The power switch is turned off if the summation signal is higher than a peak limit. The turn-on time of the power switch is detected to update the adjusting signal. | 03-21-2013 |
20130088206 | POWER CONTROLLER AND POWER MANAGEMENT CONTROL METHOD - A power controller includes a clock generator, a low-frequency clock generator, and a protection circuit. The clock generator provides a clock signal with a clock frequency for periodically switching on and off a power switch. The low-frequency clock generator provides a low-frequency clock signal with a frequency lower than the clock frequency. The protection circuit includes an over-power detection circuit and a logic circuit. The over-power detection circuit determines whether an over power event has occurred according to a feedback signal controlled by an output voltage of the power supply. When the over power event lasts longer than an over power tolerance duration, the logic circuit isolates the power switch from the clock signal to keep the power switch turned off. The over power tolerance duration is equal to a predetermined clock cycles of the low-frequency clock signal. | 04-11-2013 |
20130134904 | DIMMING DRIVING SYSTEM AND DIMMING CONTROLLER - Disclosed are dimming driving system and a dimming controller. A disclosed dimming driving system has a transformer, a lighting device, and a dimming controller. The transformer has a primary winding and a secondary winding inductively-coupled to each other. The secondary winding is coupled to an output power line and secondary ground, both coupling to and powering the lighting device. The dimming controller is coupled to the secondary winding for controlling current flowing through the lighting device according to a voltage drop of the secondary winding. | 05-30-2013 |
20130250620 | CONTROL CIRCUIT FOR REDUCING TOUCH CURRENT OF A POWER CONVERTER AND OPERATION METHOD THEREOF - A control circuit for reducing touch current of a power converter includes an auxiliary pin, a zero-crossing signal generator, a feedback pin, a frequency limiting signal generator, and a gate signal generator. The auxiliary pin receives a voltage corresponding to an auxiliary winding of the power converter. The zero-crossing signal generator generates a zero-crossing signal according to the voltage and a first reference voltage. The feedback pin receives a feedback voltage corresponding to an output voltage of the power converter. The frequency limiting signal generator generates a frequency limiting signal according to the feedback voltage and a second reference voltage. The frequency limiting signal limits the gate control signal to a predetermined frequency. The gate signal generator generates a gate control signal to a power switch of the power converter according to the frequency limiting signal and the zero-crossing signal. | 09-26-2013 |
20140233268 | CONTROLLER OF A POWER CONVERTER WITH ADJUSTABLE JITTER AMPLITUDE AND METHOD OF GENERATING ADJUSTABLE JITTER AMPLITUDE THEREOF - A controller of a power converter with adjustable jitter amplitude includes a feedback pin, a logic circuit, an auxiliary pin, and a current sensing pin. The feedback pin is used for receiving a feedback voltage from a secondary side of the power converter. The feedback voltage corresponds to an output voltage of the secondary side of the power converter. The logic circuit is used for generating a jitter signal according to a clock, the feedback voltage, and a first resistor. The auxiliary pin is used for receiving a voltage corresponding to an auxiliary winding of the power converter. The current sensing pin is used for generating a detection voltage according to a current flowing through a primary side of the power converter. The voltage, the jitter signal, and the detection voltage determine turning-on time of the primary side of the power converter. | 08-21-2014 |
20150062970 | CONTROLLERS, POWER SUPPLIES AND CONTROL METHODS - Power supplies together with related over voltage protection methods and apparatuses. A power supply has a transformer including a primary winding and an auxiliary winding. A power switch is coupled to the primary winding and a sensing resistor coupled between the power switch and a grounding line. A multi-function terminal of a controller is coupled to the sensing resistor. A diode and a first resistor is coupled between the auxiliary winding and the multi-function terminal. | 03-05-2015 |