-
公开(公告)号：US20240113629A1
公开(公告)日：2024-04-04
申请号：US18471473
申请日：2023-09-21
发明人： Xuefeng Chen , Xia Zhou , Hui Li
CPC分类号： H02M3/33507 , H02M1/0009
摘要： A controller used in an isolated switching converter. The controller has an error amplifying circuit for generating a first compensation signal based on the difference between an output feedback signal and a reference voltage, a control generator for generating a first and second control signals based on the first compensation signal, an isolation circuit for providing a first synchronous signal electrically isolated from the first control signal and a second synchronous signal electrically isolated from the second control signal, an upper threshold generator for providing an upper threshold voltage, and a peak current generator for providing a peak current signal for controlling a peak value of a current flowing through the primary switch based on the first synchronous signal, the second synchronous signal and the upper threshold voltage. The upper threshold voltage is adjusted above a first upper threshold voltage when a peak power demand is made.
-
公开(公告)号：US11689109B2
公开(公告)日：2023-06-27
申请号：US17525104
申请日：2021-11-12
发明人： Siran Wang
CPC分类号： H02M3/33523 , H02M1/08 , H02M3/33515
摘要： A multi-converter switching power supply includes a first switching converter with a first output capacitor, a second switching converter with a second output capacitor, a bypass switch coupled across the second output capacitor, and a bypass control circuit for controlling the bypass switch. Input terminals of the first and switching converters are coupled in parallel, while output terminals of the first and switching converters are coupled in series to provide a total output voltage to a load. When detecting that the second output voltage approaches a negative voltage, the bypass control circuit turns on the bypass switch, so as to protect the second output capacitor from being damaged by a reverse DC voltage.
-
公开(公告)号：US20240113630A1
公开(公告)日：2024-04-04
申请号：US18462704
申请日：2023-09-07
发明人： Xuefeng Chen , Hui Li
CPC分类号： H02M3/33515 , H02M1/0009 , H02M1/083 , H02M3/33523
摘要： A controller used in an isolated switching converter having a transformer, a primary switch and a secondary switch. The controller has an error amplifying circuit, a control generator and an isolation circuit. The error amplifying circuit generates a first compensation signal based on the difference between a reference voltage and an output feedback signal. The control generator generates a first and second control signals based on the first compensation signal. The isolation circuit has a first channel for providing a first synchronous signal electrically isolated from the first control signal, for controlling a peak value of a current flowing through the primary switch, and has a second channel for providing a second synchronous signal electrically isolated from the second control signal, for controlling the switching frequency of the primary switch.
-
公开(公告)号：US20230188046A1
公开(公告)日：2023-06-15
申请号：US17956442
申请日：2022-09-29
发明人： Xuefeng Chen , Hui Li
CPC分类号： H02M3/33515 , H02M1/08 , H02M1/0009
摘要： A control method of a zero-voltage switching converter with quasi-resonant control, the converter has a first switch and second switch respectively coupled to a primary winding and an auxiliary winding. The control method is: generating a hysteresis feedback signal based on an output feedback signal indicative of an output signal of the converter; comparing the hysteresis feedback signal with a ramp signal and generating a first comparison signal; comparing the output feedback signal with the ramp signal and generating a second comparison signal; generating a target locked valley number based on a valley pulse signal indicative of valleys of a voltage drop across the second switch, the first and second comparison signals; generating a turning on control signal corresponding to the target locked valley number for the second switch; and providing a control signal to turn on the first switch after turning off the second switch.
-
公开(公告)号：US20220166325A1
公开(公告)日：2022-05-26
申请号：US17525104
申请日：2021-11-12
发明人： Siran Wang
摘要： A multi-converter switching power supply includes a first switching converter with a first output capacitor, a second switching converter with a second output capacitor, a bypass switch coupled across the second output capacitor, and a bypass control circuit for controlling the bypass switch. Input terminals of the first and switching converters are coupled in parallel, while output terminals of the first and switching converters are coupled in series to provide a total output voltage to a load. When detecting that the second output voltage approaches a negative voltage, the bypass control circuit turns on the bypass switch, so as to protect the second output capacitor from being damaged by a reverse DC voltage.
-
公开(公告)号：US09661700B2
公开(公告)日：2017-05-23
申请号：US14937846
申请日：2015-11-10
发明人： Naixing Kuang , Qiming Zhao
CPC分类号： H05B33/0815 , H02M3/156 , H02M3/33507 , H02M2001/0003 , H05B33/0851 , H05B37/0272
摘要： A primary control LED driver includes: a switching converter having a main switch and a first winding, and configured to provide an LED driving current; a second winding magnetically coupled to the first winding and configured to provide a power supply voltage at a first terminal; a first sensing resistor with a first terminal coupled to the main switch; a second sensing resistor with a first terminal coupled to the second terminals of the first sensing resistor and the second winding; an output current calculator calculating an equivalent value of the LED driving current based on the voltage at the first terminal of the first sensing resistor; an error amplifier configured to generate a compensation signal based on the equivalent value and a reference voltage; and a control circuit generating a control signal to control the main switch based on the compensation signal.
-
7.发明公开公开(公告)号：US20240305204A1
公开(公告)日：2024-09-12
申请号：US18595738
申请日：2024-03-05
发明人： Xuefeng Chen
CPC分类号： H02M3/33515 , H02M1/0009 , H02M1/088 , H02M3/33523
摘要： A controller for controlling auxiliary switch connected in series with a clamp capacitor to form an energy recycle branch in a flyback circuit. The controller has a power supply terminal to receive an external supply voltage, a sensing terminal connected to a first terminal of a current sense resistor which is connected in series with a primary switch, a ground terminal connected to a second terminal of the current sense resistor, a drive terminal connected to a control terminal of the auxiliary switch, and a turn on control circuit. Based on a logic state of a voltage at the power supply terminal and a voltage across the current sense resistor, the turn on control circuit provides a turn on control signal to control of the auxiliary switch.
-
公开(公告)号：US10965140B2
公开(公告)日：2021-03-30
申请号：US16440936
申请日：2019-06-13
发明人： Suhua Luo , Pengpeng Ma
摘要： A control method for controlling a battery charging circuit having at least one switch, includes: generating a first difference signal based on the difference between a charging current feedback signal and a charging current reference signal; generating a bias reference signal by proportionally integrating the first difference signal when the battery voltage is higher than a first threshold and less than a second threshold; generating a bias signal by proportionally integrating the difference between the sum of the bias reference signal and a system voltage reference signal and a system voltage feedback signal; generating a comparison signal by comparing the sum of the system voltage feedback signal and a ramp signal with the sum of the bias signal and the system voltage reference signal; and generating a control signal for controlling the at least one switch based on the comparison signal and a constant time period control signal.
-
9.发明公开公开(公告)号：US20240113632A1
公开(公告)日：2024-04-04
申请号：US18467044
申请日：2023-09-14
发明人： Hui Li
CPC分类号： H02M3/33523 , H02M1/36
摘要： A controller used in an isolated switching converter having a transformer and a primary switch. The controller has an error amplifying circuit, a control generator, an isolation circuit and a threshold generator. The error amplifying circuit generates a first compensation signal based on the difference between an output feedback signal and a reference voltage. The control generator generates a first and second control signals based on the first compensation signal. The isolation circuit provides a first synchronous signal electrically isolated from the first control signal. The threshold generator generates a current threshold voltage for controlling a maximum current flowing through the primary switch. The current threshold voltage gradually increases during a start-up period, and is generated based on the first synchronous signal after the start-up period.
-
公开(公告)号：US20220103078A1
公开(公告)日：2022-03-31
申请号：US17474698
申请日：2021-09-14
发明人： Zilin Fan , Guangzhuo Li , Siran Wang
摘要： A control circuit and control method for an interleaved switching converter having a first and second interleaved voltage regulating circuit. The control method is: controlling a first switch of the first voltage regulating circuit operating in quasi-resonant mode, turning ON a second switch of the second voltage regulating circuit after the first switch is turned ON for a half switching period, generating a current sensing signal by detecting a current flowing through the second switch, generating a peak signal, wherein the peak signal is adjusted when a voltage across the second switch is higher than a voltage reference at the time the second switch is turned ON, and turning OFF the second switch when the current sensing signal increases to the peak signal.
-
-
-
-
-
-
-
-
-
搜索结果
20 条记录 (耗时 0.015 秒)
