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公开(公告)号：US11374484B2
公开(公告)日：2022-06-28
申请号：US17110011
申请日：2020-12-02
发明人： Enzhu Liang , Kaiwei Yao , Ming Gu
摘要： A multi-phase power supply includes a plurality of phase controllers each driving a first terminal of a respective inductor alternatively between an input voltage and a ground voltage to regulate an output voltage in a work mode, keeping the first terminal of the respective inductor in a high impedance state during a non-work mode, having an input for receiving an enable signal for selecting between the work mode and the non-work mode, and generating a current monitor signal to represent a current through the respective inductor during both the work mode and the non-work mode, and a controller coupled to each phase controller for selectively enabling respective ones of the phase controllers in response to a load demand, receiving the current monitor signal from each phase controller, and selectively shutting down the multi-phase power supply when a total of current monitor signals from the phase controller exceeds a threshold.
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公开(公告)号：US10826471B2
公开(公告)日：2020-11-03
申请号：US16460140
申请日：2019-07-02
发明人： Hua Zhu , Kaiwei Yao
摘要： A switch mode power supply includes an error amplifier, an oscillator, a pulse width modulation logic circuit, and an output stage. The oscillator includes a current generator that receives a clock signal and provides a current proportional to a frequency of the clock signal, a current mirror having an input coupled to the output of the current generator, and a first capacitor having a first terminal coupled to an output of the current mirror and providing a ramp signal, and a second terminal coupled to power supply voltage terminal. The pulse width modulation logic circuit compares the output of the error amplifier with the ramp signal, and generates a high- and low-side drive signals respectively to first and second outputs in response to the comparing. The output stage is responsive to the high- and low-side drive signals for alternatively coupling a switch terminal between an input voltage terminal and ground.
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公开(公告)号：US10389337B2
公开(公告)日：2019-08-20
申请号：US15584729
申请日：2017-05-02
发明人： Hua Zhu , Kaiwei Yao
摘要： A ramp generator includes a current generator, a current mirror, and a first capacitor. The current generator has an input for receiving a clock signal, and an output for providing a current proportional to a frequency of the clock signal using a first transistor having first and second current electrodes and a control electrode, an amplifier that establishes a reference voltage on the second current electrode of the first transistor, and a variable resistor coupled between the second current electrode of the second transistor and ground whose resistance is set according to the frequency of the clock signal. The current mirror has an input coupled to the first terminal of the first transistor, and a second terminal. The first capacitor has a first terminal coupled to the output of the current mirror and providing a ramp signal, and a second terminal coupled to the first power supply voltage terminal.
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公开(公告)号：US10886833B2
公开(公告)日：2021-01-05
申请号：US15582951
申请日：2017-05-01
发明人： Enzhu Liang , Kaiwei Yao , Ming Gu
摘要： A switch mode power supply controller includes a switch terminal adapted to be coupled to an inductor that drives a load, high- and low-side switches a pulse width modulation (PWM) circuit, and a current monitor circuit. The PWM circuit is coupled to a feedback terminal for receiving a feedback signal, and alternatively drives the high-side switch and the low-side switch with a duty cycle set using the feedback signal to regulate an output voltage to a desired level in a work mode, and keeps both the high-side switch and the low-side switch non-conductive in a non-work mode. The current monitor circuit provides a current monitor signal representative of a current driven from the inductor to the load, wherein the current monitor circuit forms the current monitor signal by measuring an inductor current during a work mode, and by emulating the inductor current during a non-work mode.
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公开(公告)号：US10116202B2
公开(公告)日：2018-10-30
申请号：US15195289
申请日：2016-06-28
发明人： Xiaopeng Wang , Kaiwei Yao
摘要： A DC/DC power supply system includes a primary side and a secondary side to generate an output DC voltage from an input DC voltage. The power supply also includes adaptive clamping circuitry that generates an adjustable clamping voltage and/or current to limit a Vds breakdown voltage for switches of the secondary side.
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