VID-controlled voltage regulator with audible noise correction
Granted: June 19, 2018
Patent Number:
10003255
A method for correcting audible noise from a voltage regulator due to a change of a VID indicated by a series of VID commands. A VID difference between a current value and a target value of the VID is compared with a VID threshold when a VID command for changing the VID from the current value to the target value is received. The VID is held at the current value if the VID difference is larger than the VID threshold. And the VID command is executed if a holding duration for holding the…
Clock circuit and control method thereof
Granted: June 12, 2018
Patent Number:
9998127
A clock circuit and control method thereof to avoid missing the clock signal generated by the clock circuit when the generated clock signal is synced with an external clock signal, wherein the clock circuit comprises a current compensation circuit and a current control circuit. The clock signal is generated by alternately charging and discharging a capacitor with a charging current based on a sync current and a compensating current when an external clock signal is detected. The…
Current limit peak regulation circuit for power converter with low standby power dissipation
Granted: June 12, 2018
Patent Number:
9998022
A current limit peak regulation circuit, a current limit circuit and a power converter including the current limit peak regulation circuit. The current limit peak regulation circuit provides a current limit threshold to limit a maximum allowable peak current value of a current flowing through a main switch of the power converter and adjusts the current limit threshold to decrease with decrease in a switching frequency of the power converter when the power converter is in a constant…
Switch mode power supply supporting both a bi-directional converter of a first configuration and that of a second configuration
Granted: June 12, 2018
Patent Number:
9998009
A switch mode power supply (SMPS) with control scheme selection for high-voltage configuration and low-voltage configuration of the SMPS. The SMPS operates in at least a charge state or a release state. The SMPS has a mode control module receiving a mode setting signal indicative of the configuration of the SMPS and a state indication signal indicative of the state of the SMPS. The SMPS selects a boost control module or a buck control module to control the SMPS according to the mode…
Single inductor dual output voltage converter and the method thereof
Granted: June 12, 2018
Patent Number:
9998005
A voltage converter provides a positive voltage and a negative voltage with a single inductor. The voltage converter has a first switch, a second switch, a third switch and a fourth switch switched periodically, wherein each switching period comprise a first time period, a second time period and a third time period, and wherein: during the first time period, the first switch and the fourth switch are turned on, whereas the second switch and the third switch are turned off; during the…
Switching mode power supply with adaptive frequency
Granted: May 22, 2018
Patent Number:
9979288
Switching mode power supply (SMPS) having a switch circuit and a controller. The switch circuit has an output inductor and a switch with a minimum on time. A control signal is generated by the controller to control the switching operation of the switch based on a clock signal with a switching frequency and an off signal. When the required on time of the switch is smaller than the minimum on time, the SMPS reduces the switching frequency adaptively and the actual on time of the switch is…
Method for forming stepped oxide on a substrate
Granted: May 22, 2018
Patent Number:
9978846
A method for forming a steeped oxide on a substrate is described: successively forming a first pad oxide layer, a nitride layer, a second pad oxide layer and a poly layer on the substrate; etching the poly layer to have an opening for the stepped oxide region; isotropically etching the second pad oxide layer to the nitride layer through the opening to form a stepped trench; isotropically etching the nitride layer to the first pad oxide layer through the opening to expand the stepped…
Buck-boost converter, the control circuit and the method thereof
Granted: May 8, 2018
Patent Number:
9966851
A buck-boost converter automatically chooses work mode between buck mode, boost mode and buck-boost mode, in response to an input voltage and an output voltage. The buck-boost converter is with simple structure, convenient mode transition and lower output voltage ripple.
Magnetic angular sensing system with side-shaft mounted sensor and the method thereof
Granted: April 17, 2018
Patent Number:
9945691
A magnetic angular sensing system has a magnet magnetized radially and a magnetic angular sensor for sensing the angular position of the magnet. The magnetic angular sensor is mounted in parallel to the axis of the magnet and is non-coplanar with the magnet. The magnetic angular sensor senses an angular position of the magnet based on a detected axial magnetic field component and a tangential magnetic field component of the magnetic field vector where the sensor mounted. This invention…
H-bridge bidirectional current sensing circuit
Granted: April 10, 2018
Patent Number:
9941816
A bidirectional current sensing circuit includes: a sensing resistor coupled between a load and a reference ground, a first and second auto-zero amplifiers coupled to the sensing resistor to sense the voltage across the sensing resistor, and an output transistor. One of the first and second auto-zero amplifiers operates in an output mode and the other of the first and second auto-zero amplifiers operates in a zeroing mode according to a polarity of a voltage across the sensing resistor.…
Multi-rail switching converter, control circuit and associated control method
Granted: April 10, 2018
Patent Number:
9941781
A multi-rail switching converter providing a plurality of output voltages has a master switching circuit, a plurality of slave switching circuits and a control circuit. The control circuit has an interleaving control circuit, the interleaving control circuit judges a phase zone of a corresponding slave switching circuit based on a switching control signal of the master switching circuit and a set signal of the corresponding slave switching circuit, and adjusts a turn-ON moment of the…
Method for fabricating LDMOS with reduced source region
Granted: April 10, 2018
Patent Number:
9941171
A method for fabricating a semiconductor device including: forming a block layer above a well region of a first doping type in a semiconductor substrate, wherein the block layer has an opening for defining a first region in an upper part of the well region and has sidewalls at sides of the opening; implanting dopants of a second doping type into the well region through the opening of the block layer to form the first region; implanting dopants of the first doping type into the first…
Smart LED driver and LED drive method
Granted: April 3, 2018
Patent Number:
9936548
A LED driver adopts one power stage to provide a constant drive current to drive a load, and to provide different power supply voltages to power a smart module according to a dimming signal input by users through the smart module. The LED driver provides high performance with simple circuit structure.
AC switch circuit and associated control method
Granted: April 3, 2018
Patent Number:
9935630
An AC switch circuit coupled between an AC input signal and an AC load has a first switch, a second switch, a driving circuit, and a power generation circuit. The first switch blocks a first half-cycle of the AC input signal when turned OFF, and the second switch blocks a second half-cycle of the AC input signal when turned OFF. The driving circuit provides a driving signal to control the first switch and the second switch based on an enable signal. The power generation circuit provides…
Method for fabricating LDMOS using CMP technology
Granted: April 3, 2018
Patent Number:
9935176
A method for fabricating a LDMOS device in a well region of a semiconductor substrate, including: etching a polysilicon layer above the well region through a window for a body region; and forming spacers at side walls of the polysilicon layer, to define positions of source regions in the well region.
Constant on-time switching converter with reference voltage adjusting circuit and controller thereof
Granted: March 20, 2018
Patent Number:
9923463
A COT switching converter includes a switching circuit having a main switch, an on-time control circuit configured to generate an on-time control signal, a comparing circuit, a logic circuit and a reference voltage adjusting circuit. The comparing circuit compares a reference voltage with a feedback signal indicative of output voltage of the switching circuit to generate a comparison signal. Based on the on-time control signal and the comparison signal, the logic circuit generates a…
Voltage converter integrated circuit with an integrated bootstrap capacitor
Granted: March 13, 2018
Patent Number:
9917584
A bootstrap circuit integrated to a voltage converter integrated circuit (IC) and a voltage converter IC for a switch mode voltage regulator. The bootstrap circuit is used to provide a bootstrap voltage signal for driving a high side switch of the voltage converter IC. The bootstrap circuit has a pre-charger and a bootstrap capacitor. The pre-charger provides a first bootstrap signal to pre-charge a control terminal of the high side switch, and the bootstrap capacitor provides a second…
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…
Highly scalable multiphase power supply with constant on-time DC-DC converters
Granted: March 6, 2018
Patent Number:
9912240
A multiphase power supply includes several constant ON-time (COT) DC-DC converter integrated circuits (ICs). One of the COT DC-DC converter ICs generates a synchronization signal, which is received in parallel by the other COT DC-DC converter ICs. Two or more COT DC-DC converter ICs are turned ON at the same time in synchronization with the synchronization signal (e.g., an edge of a pulse of the synchronization signal) that is received in parallel and with another synchronization signal…
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…
