Single sided channel mesa power junction field effect transistor
Granted: January 3, 2023
Patent Number:
11545585
Junction field effect transistors (JFETs) and related manufacturing methods are disclosed herein. A disclosed JFET includes a vertical channel region located in a mesa and a first channel control region located on a first side of the mesa. The first channel control region is at least one of a gate region and a first base region. The JEFT also includes a second base region located on a second side of the mesa and extending through the mesa to contact the vertical channel region. The…
Field-plate trench FET and associated method for manufacturing
Granted: December 13, 2022
Patent Number:
11527626
A field-plate trench FET having a drain region, an epitaxial layer, a source region, a gate conductive layer formed in a trench, a field-plate dielectric layer formed on vertical sidewalls of the trench, a well region formed below the trench, a source contact and a gate contact. When the well region is in direct physical contact with the gate conductive layer, the field-plate trench FET can be used as a normally-on device working depletion mode, and when the well region is electrically…
Flexible dimming circuit and a method thereof
Granted: December 6, 2022
Patent Number:
11523478
A dimming circuit for dimming a current flowing through a light emitting device, having: a multi-function pin, configured to receive a dimming signal; wherein when the dimming signal is an analog voltage signal, an amplitude of the current flowing through the light emitting device is regulated based on the dimming signal; when the dimming signal is a pulse signal and a frequency of the dimming signal is in a first frequency range, a duty cycle of the current flowing through the light…
Turn-off protection circuit for a switch unit and associated turn-off protection method
Granted: December 6, 2022
Patent Number:
11522532
A turn-off protection circuit and a turn-off protection method for a switch unit. The switch unit may include a first set of switching devices coupled between a first circuit node and an output node, and a second set of switching devices coupled between a second circuit node and the output node. The turn-off protection circuit may compare a first circuit node potential at the first circuit node and/or a second circuit node potential at the second circuit node with a switch node potential…
Phase sequence correction method and circuit for voltage converter
Granted: December 6, 2022
Patent Number:
11522461
A phase sequence correction circuit for a voltage converter has a blanking time calculation circuit and a control signal generation circuit. Based on a plurality of delay signals, the blanking time calculation circuit updates a blanking time period during which a immediately following switching circuit is not allowed on. If a sum of the plurality of delay signals is larger than an incremental threshold, then the blanking time signal increases by an incremental step. The control signal…
Junction field effect transistor with integrated high voltage capacitor
Granted: December 6, 2022
Patent Number:
11521965
Junction field effect transistors (JFETs) and related manufacturing methods are disclosed herein. A disclosed four terminal JFET includes an integrated high voltage capacitor (HVC). The JFET includes a first terminal coupled to a drain region, a second terminal coupled to the source region, a third terminal coupled to the base region, and an integrated HVC terminal coupled to an integrated HVC electrode which forms an HVC with the drain region. The JFET also includes a channel formed by…
Low leakage ESD MOSFET
Granted: November 22, 2022
Patent Number:
11508806
A MOSFET fabricated in a semiconductor substrate, includes: a gate oxide region formed atop the semiconductor substrate; a gate polysilicon region formed on the gate oxide region; a source region of a first doping type formed in the semiconductor substrate and located at a first side of the gate polysilicon region; and a drain region of the first doping type formed in the semiconductor substrate and located at a second side of the gate polysilicon region. The gate polysilicon region has…
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…
