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公开(公告)号：US11665799B2
公开(公告)日：2023-05-30
申请号：US17829606
申请日：2022-06-01
发明人： Xiaohua Sun , Hao Chen
CPC分类号： H05B45/30
摘要： A dimming mode detection circuit for an LED lighting system that receives an alternating current input voltage and generates a bus voltage to drive an LED load, the dimming mode detection circuit including: a leading edge detection circuit configured to generate a leading edge detection signal by detecting a leading edge of a first voltage representative of the bus voltage in one sine half-wave cycle, in order to determine whether the LED lighting system operates in a leading edge dimming mode; and a trailing edge detection circuit configured to generate a trailing edge detection signal in accordance with a time length of a first interval from a first value of the first voltage in a previous sine half-wave cycle to a second value of the first voltage in a next sine half-wave cycle, in order to determine whether the LED lighting system operates in a trailing edge dimming mode.
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22.发明公开公开(公告)号：US20230155502A1
公开(公告)日：2023-05-18
申请号：US17975778
申请日：2022-10-28
CPC分类号： H02M3/158 , H02M3/07 , H02M3/01 , H02M3/33569 , H02M7/04
摘要： A multilevel self-balance control circuit can include: a voltage divider unit configured to receive and divide an input voltage; a voltage-controlled charge source load coupled to an output terminal of the voltage divider unit, and being configured to adaptively adjust charge amount input to the voltage-controlled charge source load based on an output voltage of the voltage divider unit, such that a total amount of charges flowing through the voltage-controlled charge source load during a period of each working state of the voltage divider unit is positively correlated with the output voltage of the voltage divider unit, thereby forming a negative feedback loop to achieve voltage balancing of the voltage divider unit; and a control unit configured to generate control signals for the voltage divider unit and the voltage-controlled charge source load, thereby coordinately controlling the voltage divider unit and the voltage-controlled charge source load.
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公开(公告)号：US20230119541A1
公开(公告)日：2023-04-20
申请号：US17965938
申请日：2022-10-14
发明人： Zhan Chen , Qiukai Huang , Jin Jin , Guiying Zhang
摘要： A method of controlling a switch-mode converter can include: obtaining an overcurrent reference threshold according to an output voltage sampling signal indicative of an output voltage of the switch-mode converter; and generating an over current protection triggering signal in response to an output current sampling signal indicative of an output current of the switch-mode converter and the overcurrent reference threshold meet a predetermined criterion, thereby triggering the switch-mode converter to enter a protection state.
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公开(公告)号：US11622430B2
公开(公告)日：2023-04-04
申请号：US17734369
申请日：2022-05-02
发明人： Yuanyu Yang , Bo Cai , Jian Li
IPC分类号： H05B45/385 , H02M3/335
摘要： A control circuit for controlling a power converter can include: a constant voltage output module, a constant current output module, and a power stage circuit; and where the control circuit is configured to select one of a first feedback signal representative of output information of the constant current output module, and a second feedback signal representative of output information of the constant voltage output module as a feedback input signal based on operation states of the constant current output module and the constant voltage output module, in order to control a switching state of a power switch of the power stage circuit.
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公开(公告)号：US11611347B2
公开(公告)日：2023-03-21
申请号：US17375803
申请日：2021-07-14
发明人： Ying Huang , Di Gao , Kun Li , Jinyu Qin
IPC分类号： H03M1/06
摘要： An integrator and an analog-to-digital converter are provided. The analog-to-digital converter includes the integrator, a comparison circuit and a control logic circuit. The integrator includes an operational amplifier, offset capacitors, input capacitors, integral capacitors and controllable switches. The input capacitors and the integral capacitors are connected to the operational amplifier via controllable switches, so that the integrator operates in various operation modes. Operation states of the offset capacitors in a first phase and a second phase of an operation cycle are controlled by switching on or off the controllable switches. Therefore, an offset voltage of the integrator is eliminated, and conversion efficiency and conversion accuracy of the analog-to-digital converter is improved.
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公开(公告)号：US11606037B2
公开(公告)日：2023-03-14
申请号：US17146621
申请日：2021-01-12
发明人： Longqi Wang
IPC分类号： H02M3/335 , G01R19/175 , H02M1/32 , H02M1/00
摘要： A detection circuit for a switching converter, whereby: the detection circuit is coupled in parallel with an output capacitor of the switching converter, and is configured to provide a detection branch coupled in parallel with the output capacitor during a first period of a switching cycle, in order to detect an output voltage of the switching converter; and an output voltage detection signal is generated according to the detected output voltage during a second period of the switching cycle. A switching converter can include the detection circuit and an integrated circuit.
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公开(公告)号：US11601043B2
公开(公告)日：2023-03-07
申请号：US17022270
申请日：2020-09-16
发明人： Longqi Wang , Jianxin Wang
摘要： A control circuit for controlling an AC-DC power supply, can include: a pulse-width modulation (PWM) signal generating circuit configured to generate a PWM signal in accordance with a reference voltage and a current sampling signal representing an inductor current flowing through an inductor of the AC-DC power supply, and to control a power stage circuit of the AC-DC power supply in accordance with the PWM signal; and a reference voltage generating circuit configured to generate the reference voltage based on an input voltage of the AC-DC power supply.
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公开(公告)号：US20230067735A1
公开(公告)日：2023-03-02
申请号：US17895272
申请日：2022-08-25
发明人： Chaojun Chen
摘要： A control circuit for a switching power supply, can include: a sampling circuit configured to obtain an inductor current and a drain-source voltage of a main power transistor in a power stage circuit, in order to generate a sampling signal; where the control circuit generates an inductor current sampling signal according to the sampling signal during an on-period of the main power transistor; and where during an off-period of the main power transistor, the control circuit generates a zero-crossing signal of the inductor current and an overvoltage signal of an output voltage of the switching power supply according to the sampling signal.
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公开(公告)号：US20230035951A1
公开(公告)日：2023-02-02
申请号：US17867795
申请日：2022-07-19
发明人： Yan Ye , Cheng Liang
摘要： A method for controlling a phase-locked loop circuit, can include: acquiring values of a voltage-controlled oscillator capacitor array control signal respectively corresponding to desired values of a frequency control word signal and acquiring values of a charge pump current control signal respectively corresponding to the desired values of the frequency control word signal in a calibration mode, where the frequency control word signal characterizes a ratio of a desired locked frequency to a frequency of a reference signal; and determining a target value of the voltage-controlled oscillator capacitor array control signal corresponding to a target value of the frequency control word signal and a target value of the charge pump current control signal corresponding to the target value of the frequency control word signal in a phase-locked mode, in order to control the phase-locked loop circuit to achieve phase lock.
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公开(公告)号：US20220399888A1
公开(公告)日：2022-12-15
申请号：US17830651
申请日：2022-06-02
发明人： Zhan CHEN , Jian DENG , Qiukai HUANG
IPC分类号： H03K17/687 , H03K17/10 , H03K17/16
摘要： A driving circuit and a driving method are provided. According to embodiments of the present disclosure, a power switch is driven by constant voltage or constant current during different time periods. The power switch is driven by using a first driving current during a Miller platform period, and the power switch is driven by using a second driving current when the Miller platform period ends, where the first driving current is less than the second driving current, so as to optimize EMI, reduce loss and improve efficiency.
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