Soft start switching power supply system
Granted: March 6, 2018
Patent Number:
9912236
A switching power supply system includes a switching converter, to convert an input voltage into an output voltage and to generate a switching signal; a feedback circuit, to generate a feedback signal; an error amplifier to generate an error signal; a triangle signal generator to generate a triangle signal; a constant on time control circuit to receive error signal and the triangle signal, and to generate a constant on time control signal to control power switch; in the system. The…
Boost converter with short-circuit protection and method thereof
Granted: March 6, 2018
Patent Number:
9912145
A short-circuit protection method for a boost converter is disclosed. In this method, a switch of a switching circuit of the boost converter is turned on and a control voltage with a gradually increasing magnitude is supplied to control a short-circuit protection switch coupled between an input voltage and the switching circuit when the boost converter starts up. Then, a current flowing through the switch is detected and compared with a predetermined value. The switch is turned off and a…
ESD protection circuit with false triggering prevention
Granted: February 13, 2018
Patent Number:
9893518
An ESD protection circuit used to protect a protected circuit coupled between a first node and a second node against an ESD event. The ESD protection circuit has a discharging circuit and a control circuit. The discharging circuit selectively provides a current path for discharging a current from the first node to the second node. The control circuit controls the discharging circuit to switch on the current path during an ESD event. The control circuit further controls the discharging…
Manufacturing method of selectively etched DMOS body pickup
Granted: February 13, 2018
Patent Number:
9893170
A method for fabricating a LDMOS device in a well region of a semiconductor substrate, including: forming a body region and a source layer in the well region through a window of a polysilicon layer above the well region, wherein the body region has a deeper junction depth than the source layer; forming spacers at side walls of the polysilicon layer; and etching through the source layer through a window shaped by the spacers, wherein the source layer under the spacers is protected from…
Lateral DMOS and the method for forming thereof
Granted: February 13, 2018
Patent Number:
9893146
A lateral DMOS device with peak electric field moved below a top surface of the device along a body-drain junction is introduced. The LDMOS has a deep body and a drift region formed by a series of P-type and N-type implants, respectively. The implant doses and depths are tuned so that the highest concentration gradient of the body-drift junction is formed below the surface, which suppresses the injection and trapping of hot holes in the device drain-gate oxide region vicinity, and the…
Multi-time programmable non-volatile memory cell and associated circuits
Granted: February 13, 2018
Patent Number:
9892787
A multi-time programmable memory cell has a differential multi-time programmable memory cell and a second-level latch cell. The differential multi-time programmable memory cell provides a first balance signal and a second balance signal, and the second-level latch cell receives the first balance signal and the second balance signal and provides an output signal according to the first balance signal and the second balance signal based on a first latch control signal and a second latch…
Switching converter with smart frequency generator and control method thereof
Granted: February 13, 2018
Patent Number:
9891648
A control method of a switching converter, wherein the switching converter has a main transistor and is configured to provide an output signal. The control method includes: generating a feedback signal indicative of the output signal of the switching converter; generating a clock signal to determine the switching frequency of the main transistor; generating a control signal to control the main transistor based on the clock signal and the feedback signal; and detecting whether the on-time…
Bidirectional switch circuit for power banks and the method thereof
Granted: January 30, 2018
Patent Number:
9882405
A power bank having an input terminal; an output terminal; a battery; a bidirectional switch circuit coupled between the battery and the output terminal of the power bank; and a select circuit coupled between the input terminal and the output terminal of the power bank; wherein when the input terminal is wired up with a power source, and the load is powered by the power source, and meanwhile, the battery is charged by the power source via the select circuit and the bidirectional switch…
Buck-boost converters with ramp compensation
Granted: January 30, 2018
Patent Number:
9882489
A control method used in a four-switch buck-boost converter includes: filtering the voltage at the first switching node and generating a first ramp signal; filtering the first ramp signal and generating a first average signal; filtering the voltage at the second switching node and generating a second ramp signal; filtering the second ramp signal and generating a second average signal; generating a set signal based on the first ramp signal, the first average signal, the second ramp…
Current sense circuit with adaptive common mode voltage adjust and associated method thereof
Granted: January 30, 2018
Patent Number:
9882482
A current sense circuit for sensing a target current flowing through a sensing resistor, has a first operational amplifier, a first transistor and a common mode adjust circuit. The first operational amplifier has a first input terminal coupled to a positive terminal of the sensing resistor, a second input terminal coupled to a negative terminal of the sensing resistor, and an output terminal. The first transistor has a first terminal coupled to the first input terminal of the first…
Constant on-time control method used in buck-boost converters
Granted: January 23, 2018
Patent Number:
9876431
A control method used in a four-switch buck-boost converter includes: sensing the output voltage and generating a feedback signal; generating a compensation signal based on a reference signal and the feedback signal; sensing the current flowing through the inductor and generating a current sensing signal; comparing the current sensing signal with the compensation signal; turning on the first and third transistors and turning off the second and fourth transistors when the current sensing…
Smart switch for connecting an input power supply to a load
Granted: January 16, 2018
Patent Number:
9871508
A monolithic integrated circuit (IC) switch device includes an input pin that receives an input power supply and an output pin that is connected to a load. The monolithic IC switch device includes driving circuitry that controls a switching operation of a power switch to connect and disconnect the input power supply to and from the load. A microcontroller can enable or disable the monolithic IC switch device based on indicator signals received by the microcontroller from the monolithic…
Variable reference signal generator used with switching mode power supply and the method thereof
Granted: December 12, 2017
Patent Number:
9841779
A reference signal generator used with a switching mode power supply which converts an input voltage to an output voltage. The reference signal generator provides a reference signal consisting of a constant voltage signal and a variable voltage signal which is varying according to a duty cycle of the switching mode power supply during a startup period of the switching mode power supply and is varying according to a ratio of the input voltage at an end of the startup period to the input…
Electronic device with substrate current management
Granted: December 5, 2017
Patent Number:
9837999
An electronic device with substrate current management. The electronic device has a semiconductor substrate in which a Schottky diode is formed. A parasitic PN diode is also formed in the semiconductor substrate, and coexisted with the Schottky diode in parallel. The forward voltage of the Schottky diode is limited to be larger than the forward conduction threshold voltage of the Schottky diode and to be smaller than the forward conduction threshold voltage of the parasitic PN diode.
Power converter with improved load transient response and associated control method
Granted: December 5, 2017
Patent Number:
9837899
A power converter including a load transient response control module and associated method for controller the power converter. The load transient response control module detects a deviation of an output voltage of the power converter from a desired value of the output voltage and compares the deviation with a first threshold to provide a load response control signal indicating whether load transient change occurs. If the deviation is lower than the first threshold, a clock signal of the…
Methods for sensing current in a switching regulator
Granted: November 14, 2017
Patent Number:
9817039
In one embodiment, a current sensing circuit includes a differential current sensing amplifier adapted for sensing a voltage drop across a main transistor, the differential current sensing amplifier being adapted for providing a switched current output to a timing circuit which is adapted for providing a timing signal to one or more switching current sample-and-hold circuits based on a current waveform of the switched current output, and the one or more switching current sample-and-hold…
Resonant converter with capacitive mode control and associated control method
Granted: November 7, 2017
Patent Number:
9812975
A control circuit used for controlling a resonant converter. The control circuit has a setting capacitor, N up thresholds and N low thresholds. If the resonant converter operates in the inductive mode, a setting voltage signal across the setting capacitor is respectively compared with the largest one of the N up thresholds and the smallest one of the N low thresholds in each operation cycle to generate a high-side control signal and a low-side control signal for controlling a high-side…
Current detection and averaging circuit for switching power supplies with a half-bridge switch circuit topology
Granted: November 7, 2017
Patent Number:
9812963
A power supply includes a half-bridge circuit. The power supply further includes an output inductor connected to a switch node that is common to a high side switch and a low side switch of the half-bridge. During a turn ON time of the low side switch, a current detection circuit of the power supply samples and holds in a capacitor a valley of an inductor current flowing through the output inductor. Also during the turn ON time of the low side switch, the current detection circuit samples…
PFC control circuit, digital PFC circuit and the method thereof
Granted: November 7, 2017
Patent Number:
9812950
A digital PFC circuit with improved power factor is described. The digital PFC circuit uses a compensation current generating unit and a reference current adjust unit to eliminate the effect of a current flowing through an input capacitor to the input current, so that the input current and the input line voltage of the digital PFC circuit are controlled to be in-phase.
Primary side regulated isolation voltage converter
Granted: October 10, 2017
Patent Number:
9787194
A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare…
