X capacitor discharging circuit and method thereof
Granted: November 15, 2022
Patent Number:
11502538
A discharge circuit for an X capacitor has a first voltage detection circuit providing a first indicating signal based on a voltage across two input terminals of a switching converter to indicate whether the two input terminals are connected to an AC power source, and a discharge module starting a discharge operation on the X capacitor based on first indicating signal, and the discharge operation discharges the X capacitor during a first time period, and stops discharging the X capacitor…
Power management circuit with over-current protection and over-current protection method thereof
Granted: November 15, 2022
Patent Number:
11502502
A power management circuit has a power input terminal coupled to a power supply or a load, a power terminal configured to provide an output voltage, and a battery terminal coupled to a battery. The power management circuit further has a current limiting circuit, an over-current indication circuit and an over-current threshold selecting circuit. The current limiting circuit compares a current feedback signal indicative of an output current flowing out of the power terminal with a current…
Isolated switching converter with high feedback accuracy and control method
Granted: November 1, 2022
Patent Number:
11489448
An isolated switching converter has a primary switch and a control circuit. The control circuit has a first sampling circuit, a second sampling circuit, a compensation circuit and a feedback control circuit. The first sampling circuit is coupled to an auxiliary winding of a transformer to receive a voltage on the auxiliary winding and is configured to generate a first feedback signal having an alternating current signal indicative of an output voltage. The second sampling circuit is…
Battery charging circuit, control circuit and associated control method
Granted: November 1, 2022
Patent Number:
11489357
A battery charging circuit providing a charging current to a battery via a charging transistor. A control circuit used to control the battery charging circuit has a system voltage control loop providing a system voltage compensation signal, a charging current control loop providing a charging current compensation signal and a charging transistor control loop providing a charging regulation signal based on a charging transistor reference signal and the system voltage feedback signal.
Trans-inductor voltage regulator with nonlinear transformer
Granted: October 18, 2022
Patent Number:
11476763
A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a regulator block for each phase. Each regulator block is connected to an output capacitor of the TLVR circuit by way of a first winding of a corresponding nonlinear transformer. A second winding of the nonlinear transformers are connected in series with a compensation inductor. The first winding of the corresponding nonlinear transformer has a first inductance when a load current is at a first level, and the first…
Switching mode power supply with adaptive threshold setting
Granted: October 18, 2022
Patent Number:
11476749
A switching mode power supply with an adaptive setting of a threshold valley voltage. The switching mode power supply decreases a reference auxiliary current when a valley value of a primary switching voltage across a primary switch is smaller than a first threshold valley voltage. And in addition, the switching mode power supply can increase the reference auxiliary current when the valley value of the primary switching voltage is larger than a second threshold valley voltage.
Daisy-chain battery cells system with differential communication interfaces
Granted: October 18, 2022
Patent Number:
11476506
A daisy-chain battery cells system having a plurality of differential communication interfaces {F(i), i=1, . . . , N} respectively coupled to a plurality of voltage measuring modules {S(i), i=1, . . . , N} for a plurality of battery cells {C(i), i=1, . . . , N}. For each i=1, . . . , N?1, a first high side differential pin pair (CLU(i)+, CLU(i)?) of the ith differential communication interface F(i) is coupled to a first low side differential pin pair (CLL(i+1)+, CLL(i+1)?) of the (i+1)th…
Led driving system with communication between multiple integrated circuits
Granted: October 11, 2022
Patent Number:
11470707
An LED driving system for synchronizing two LED driving integrated circuits to drive LED strings. The LED driving system sequentially activates the LED strings driven by the first LED driving integrated circuit and then outputs a downstream enabling signal from the first LED driving integrated circuit to the second LED driving integrated circuit to activate the LED strings driven by the second LED driving integrated circuit.
Step-up switching converter and control circuit and method thereof
Granted: October 11, 2022
Patent Number:
11469668
A control circuit and control method for controlling a step-up switching converter. The control circuit has an ultra-low voltage regulation module used to generate a control signal based on an output voltage feedback signal and an input voltage signal. When the input voltage signal is smaller than an ultra-low voltage threshold, the control signal controls a high side switch of the step-up switching converter off and controls a low side switch of the step-up switching converter to…
Trans-inductor voltage regulator with nonlinear compensation inductor
Granted: September 20, 2022
Patent Number:
11451145
A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a regulator block for each phase. Each regulator block has a winding of a transformer as an output inductor. The other windings of the transformers are connected in series with a nonlinear compensation inductor. The compensation inductor has a large inductance when the compensation inductor current is responsive to a steady state load current and has a small inductance when the compensation inductor current is…
Zero current controlled dimming circuit and a method thereof
Granted: September 13, 2022
Patent Number:
11445582
A control circuit of a zero current controlled dimming circuit having a high side power switch, a low side power switch and an inductor, having: an error circuit, providing a compensation signal based on a reference signal and a current sense signal indicative of an output current; a compensation circuit, providing a compensation off time signal based on the compensation signal and a peak value sample and hold signal indicative of a peak value of an inductor current; and a control signal…
Switching regulator with improved load regulation and the method thereof
Granted: September 13, 2022
Patent Number:
11444527
A switching regulator with improved load regulation is discussed. The switching regulator increases an on time length of a first power switch if the switching regulator operates at discontinuous current mode and a current flowing through the second power switch crosses a zero reference, until the first power switch is turned on again; and the switching regulator maintains the on time length of the first power switch during other time period.
Buck-boost converter circuit, control circuit and associated control method
Granted: May 10, 2022
Patent Number:
11329563
A buck-boost converter working in a buck mode with buck switching cycles, a boost mode with boost switching cycles or a buck-boost mode with buck-boost switching cycles. Each of the buck-boost switching cycles has an AC phase, an AD phase and a BD Phase, and the duty cycle of the AC phase is determined by a reference signal, a feedback signal and an inductor current sense signal, the duty cycle of the AD phase is controlled and maintained at a preset duty threshold, the time period of…
Multi-input single output power system and operating method thereof
Granted: May 10, 2022
Patent Number:
11329556
A multi-input single output power system for outputting an output voltage on an output node. It includes a first integrated circuit (IC) converter device and a second IC converter device. The first IC converter device has a first pin to receive a first input voltage, a second pin to output the output voltage, and a first power unit coupled between the first pin and the second pin. The second IC converter device has a first pin to receive a second input voltage, a second pin to output the…
Adaptive feedback control in LED driving circuits
Granted: April 19, 2022
Patent Number:
11310879
A feedback control circuit in an LED driving circuit for driving a plurality of LED strings. Each LED string provides a headroom detecting voltage. The feedback control circuit has a status detecting circuit, a counting circuit and a modulating circuit. The status detecting circuit compares each headroom detecting voltage with a low headroom threshold voltage and a high headroom threshold voltage and generates an up self-status signal and a down self-status signal. The counting circuit…
Control circuit for multi-phase voltage regulator and associated control method
Granted: April 12, 2022
Patent Number:
11303204
A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a switching circuit for each phase. Each switching circuit has a winding of a transformer as an output inductor. The other windings of the transformers are connected in series with a nonlinear compensation inductor. An on-time period of each switching circuit is reduced when a load transient condition occurs or when a load current starts to be stable after the load transient condition.
Controller for a multi-phase converter and fault detection method thereof
Granted: March 22, 2022
Patent Number:
11283358
A fault detection method is sampling currents flowing through a plurality of switching circuits to generate a plurality of current sampling signals, generating a first reference signal and a second reference signal based on a predetermined reference signal and a ripple threshold signal, and generating a plurality of fault signals based on comparison results of each of the plurality of current sampling signals with the first reference signal and the second reference signal. When one of…
FET device insensitive to noise from drive path
Granted: March 22, 2022
Patent Number:
11282959
A FET device has a substrate, a plurality of repetitive source stripes, a first layout of drain stripe having a first drift region and a first drain region, a second layout of drain stripe having a second drift region and a second drain region, a first drain contactor contacted with the first drain region and connected to a drain terminal, a second drain contactor contacted with the second drain region and connected to a first gate terminal, a source contactor contacted with a source…
Controller and control method used in resonant converters
Granted: March 15, 2022
Patent Number:
11277071
A control circuit used in a resonant converter with a switching circuit and a resonant circuit is provided, the switching circuit has a high side transistor and a low side transistor, the resonant circuit has a resonant capacitor and a resonant inductor. The control circuit includes: a calculating module used to generate an output current calculating value based on a voltage across the resonant capacitor and a correction signal at an off moment of the high side transistor; a comparing…
Resonant converter circuit with switching frequency control based on input voltage
Granted: February 22, 2022
Patent Number:
11258368
A control method for regulating the switching frequency of a resonant converter having an input terminal to receive an input voltage and an output terminal to output an output voltage. The control method is sensing the input voltage and adjusting the switching frequency based on the comparison of the input voltage with a reference threshold voltage. When the input voltage is less than the reference threshold voltage, the switching frequency is adjusted to decrease, and when the input…
