Power transistor driver with reduced spikes for switching converters
Granted: November 17, 2020
Patent Number:
10840795
A driver for driving a power transistor, the driver having: a first transistor, and a second transistor; wherein (1) when the first transistor is turned on, the second transistor is simultaneously turned on, and wherein after the second transistor remains on for a first time period, the second transistor is turned off for a second time period during when a switching voltage at a second terminal of the power transistor is rising, and the second transistor is turned on after the second…
Input AC voltage sensing for flyback circuit
Granted: November 3, 2020
Patent Number:
10826401
Input AC voltage sensing for a flyback circuit. The flyback circuit is configured as “primary-high”, namely a primary switch of the flyback circuit is positioned “high” to receive an input AC voltage through a first rectifying circuit. A primary winding of the flyback circuit is coupled to a primary ground reference. A voltage sensing circuit has a processing circuit and a first sensing resistor. The processing circuit has a first terminal coupled to the input AC source through a…
Current threshold regulation method used in switching converters
Granted: September 29, 2020
Patent Number:
10790737
A current threshold regulation method is used in a switching converter with a tank element and a transistor. The current threshold regulation method includes: detecting whether the input voltage is lower than an input under voltage threshold and generating an input under voltage indication signal; detecting whether the output voltage is lower than an output under voltage threshold and generating an output under voltage indication signal; generating a current threshold based on the input…
Driving circuit allowing efficient turning-off of synchronous rectifiers
Granted: September 22, 2020
Patent Number:
10784791
A driving circuit and driving method for driving a synchronous rectifier. When a drain-source detecting voltage between a drain terminal and a source terminal of the synchronous rectifier reaches a second reference voltage, the driving voltage applied at a gate terminal of the synchronous rectifier is decreased to regulate the drain-source detecting voltage to a first reference voltage. The first reference voltage is lower than the second reference voltage. And when the drain-source…
Zero-voltage-switching flyback converter
Granted: September 1, 2020
Patent Number:
10763752
A method of controlling a flyback circuit and control circuit thereof. The flyback circuit has a transformer having a primary winding and an auxiliary winding, and the primary winding and the auxiliary winding have opposite dot orientations with each other. During a switching cycle, a primary switch coupled to the primary winding is turned off; then, an auxiliary switch coupled to the auxiliary winding is turned on when, after an elapse of a predetermined waiting time counted from a…
Voltage regulators with controlled output voltage and the method thereof
Granted: August 25, 2020
Patent Number:
10756621
A voltage regulator provides an output voltage and an output current. The output voltage decreases with an increase of the output current when the output current is lower than a current breaking point, and the output voltage is maintained when the output current reaches the current breaking point.
System and method for standby mode operation of power management system
Granted: August 25, 2020
Patent Number:
10754410
A power management system having: a core rail, configured to provide a core voltage to a core; a GT rail, configured to provide a GT voltage to a graphic terminal; and a VR thermal indicative pin, coupled to a core thermal indicative pin of the core; wherein the VR thermal indicative pin is pulled down for a preset time duration once the core rail is commanded to exit a PS4 state, or for a time duration beginning when the core rail is commanded to exit the PS4 state ending when the GT…
Power converter with improved load transient response and associated control method
Granted: July 28, 2020
Patent Number:
10727742
A power converter including a load transient enhancing module and associated method for improving load transient response of the power converter. The load transient enhancing module detects whether load transient is occurring in a load of the power converter, and turns the secondary switch off and locks the secondary switch at “OFF” state to turn on a body diode of the secondary switch once load transient is occurring in the load.
Voltage regulator and associated auto-loop regulation system and method
Granted: July 28, 2020
Patent Number:
10725938
An auto-loop regulation system for a voltage regulator receives a plurality of pre-determined loop parameters through an interactive computing equipment, and the voltage regulator operates according to the plurality of pre-determined loop parameters, wherein the interactive computing equipment regulates at least one of the loop parameters automatically in real time according to an online loop value when the voltage regulator is operating online, and the interactive computing equipment…
Single stage multi-outputs circuit and a method thereof
Granted: July 14, 2020
Patent Number:
10715044
A control circuit of a power converter providing at least a first output voltage and a second output voltage, having: a first loop control circuit, configured to provide a first error amplifying signal based on the first output voltage and a first reference voltage; a second loop control circuit, configured to provide a second error amplifying signal based on the second output voltage and a second reference voltage; a saturation detecting circuit, configured to provide a saturation…
Symmetrical power stages for high power integrated circuits
Granted: June 23, 2020
Patent Number:
10693378
A circuit assembly for a power converter includes a substrate, power stage integrated circuit (IC) dies, and output inductors that connect switch nodes of the power stage IC dies to an output node of the power converter. The power stage IC dies are mounted on one side of the substrate and the output inductors are mounted on an opposing side of the substrate. Two output inductors go through a magnetic core. A heatsink is attached to surfaces of the power stage IC dies. A power stage IC…
Switching power supply circuit with synchronous rectification and associated control method
Granted: June 2, 2020
Patent Number:
10673344
A switching power supply circuit with synchronous rectifier has an energy storage component, a rectifier switch coupled to a secondary side of the energy storage component, and a secondary side control circuit. The secondary side control circuit provides a driving signal to control the rectifier switch. When the drain-source voltage across the rectifier switch is less than a first threshold value, the secondary side control circuit controls the driving signal to be a maximum voltage to…
DC-DC converter with droop regulation
Granted: June 2, 2020
Patent Number:
10673336
A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a…
Circuit with reduced light load power dissipation and a method thereof
Granted: June 2, 2020
Patent Number:
10673331
A feedback block used with an isolated switching converter, having: a variable resistance circuit receiving a resistance control signal and having an equivalent resistance in proportional to a duty cycle of the resistance control signal; and a resistance control circuit, configured to provide the resistance control signal based on a load of the isolated switching converter; wherein the duty cycle of the resistance control signal varies in response to the load of the isolated switching…
Multiphase charging circuit with improved transient response and control method thereof
Granted: June 2, 2020
Patent Number:
10673268
A multiphase charging circuit includes a first phase having a first switch and a second phase having a second switch to provide a system voltage for a system load, a control method of the multiphase charging circuit includes: generating a plurality of feedback control signals with generating each of feedback control signal based on a corresponding feedback signal, a ramp signal, a corresponding reference signal and a current flowing through the first phase; selecting one of the plurality…
COT control circuit and associated DC-DC converter
Granted: May 26, 2020
Patent Number:
10666272
A COT control circuit for DC-DC converter. The COT control circuit has a synchronizing signal generator, an on time generator and a frequency locking circuit. The synchronizing signal generator generates a synchronizing signal and a frequency-modulated signal. The on time generator receives an input voltage signal, an output voltage signal, an error signal and the frequency-modulated signal to generate an on time signal. The error signal is generated by the frequency locking circuit…
LDMOS device with a field plate contact metal layer with a sub-maximum size
Granted: May 26, 2020
Patent Number:
10665712
An LDMOS device with a field plate contact having a field plate contact metal layer being positioned above the field plate contact. The field plate contact metal layer has a sub-maximum size satisfied for the electrical connection between the field plate contact and an external applying voltage. This sub-maximum size is prescribed by the physical limitation of the LDMOS device. The field plate contact metal layer extends a sub-maximum length from one edge toward to the other edge of the…
Battery pack and discharge method for limiting an excessive discharge current
Granted: May 19, 2020
Patent Number:
10658856
A battery management system (BMS) used in a battery pack, the battery pack has a discharging switch coupled between a battery and a load, and the load has a capacitor charged by the battery pack. The BMS has a driver circuit having a power supply terminal to receive a drive voltage, a ground reference terminal coupled to receive the battery pack voltage and an output terminal coupled to a control terminal of the discharging switch. The BMS generates a normal drive voltage and a ramp…
Multi-phase converter and associated control circuit and control method for undershoot improvement
Granted: May 12, 2020
Patent Number:
10651721
A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases…
Current sampling circuit applied to a multi-mode circuit and associated control method
Granted: May 12, 2020
Patent Number:
10651738
A multi-mode circuit has a first switch, a second switch, a third switch and a fourth switch. A current sampling circuit applied to the buck-boost has a first sampling circuit, a second sampling circuit and a current processing circuit. The first sampling circuit generates a first sampling current by sampling the current flowing through the first switch, the second sampling circuit generates a second sampling current by sampling the current flowing through the second switch, and the…
