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公开(公告)号：US11846956B2
公开(公告)日：2023-12-19
申请号：US17547512
申请日：2021-12-10
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
IPC: G05F1/46
Abstract: A linear voltage regulator includes a transistor, an error amplifier, a feedback circuit and a compensation circuit. The transistor has a first terminal for receiving an input voltage, a second terminal for providing an output voltage, and a control terminal. The error amplifier has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives a reference voltage, and the output terminal is coupled to the control terminal of the transistor. The feedback circuit receives the output voltage and generates a feedback voltage lower than the output voltage. The compensation circuit is configured to receive the feedback voltage and generate a compensation voltage at the second input terminal of the error amplifier. The compensation circuit includes a compensation capacitor for introducing a zero point into an open-loop transfer function of the linear voltage regulator to improve system stability.
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公开(公告)号：US20220206519A1
公开(公告)日：2022-06-30
申请号：US17547512
申请日：2021-12-10
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
IPC: G05F1/46
Abstract: A linear voltage regulator includes a transistor, an error amplifier, a feedback circuit and a compensation circuit. The transistor has a first terminal for receiving an input voltage, a second terminal for providing an output voltage, and a control terminal. The error amplifier has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives a reference voltage, and the output terminal is coupled to the control terminal of the transistor. The feedback circuit receives the output voltage and generates a feedback voltage lower than the output voltage. The compensation circuit is configured to receive the feedback voltage and generate a compensation voltage at the second input terminal of the error amplifier. The compensation circuit includes a compensation capacitor for introducing a zero point into an open-loop transfer function of the linear voltage regulator to improve system stability.
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公开(公告)号：US20210068220A1
公开(公告)日：2021-03-04
申请号：US16999290
申请日：2020-08-21
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Huafei Ding , Changxian Zhong
IPC: H05B45/14
Abstract: A light-emitting element driving device and controller and dimming method for the light-emitting element driving device. The light-emitting driving device has a dimming resistor and a power converter. A first current is provided to the dimming resistor, and a voltage across the dimming resistor is compared with a first threshold voltage. Then a second current is provided according to the comparison result. A dimming signal is generated based the voltage across the dimming resistor and a current flowing through the dimming resistor, to control the power converter to drive a plurality of light-emitting elements. A plurality of voltage windows may be configured for the dimming signal. a 2-step dimming function may be activated for high precision.
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公开(公告)号：US20180006564A1
公开(公告)日：2018-01-04
申请号：US15633688
申请日：2017-06-26
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
CPC classification number: H02M3/158 , H02M1/36 , H02M2001/0025 , H02M2001/0032 , H03K3/017 , H03K17/16 , H03M1/1014 , H03M1/1023 , H03M1/52 , H03M1/804 , H04W76/23
Abstract: An auto calibration method used in switching converters with constant on-time control. The auto calibration method includes: generating a periodical clock signal with a predetermined duty cycle; providing a first voltage and a second voltage to an on-time control circuit to generate an on-time control signal based on the first and second voltage; providing the clock signal and on-time control signal to a logic circuit to generate a switch control signal based on the clock signal and on-time control signal; comparing the duty cycle of the switch control signal with the duty cycle of the clock signal to adjust a calibration code signal; and adjusting circuit parameters of the on-time control circuit in accordance with the calibration code signal.
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Patent Agency Ranking
公开(公告)号：US20230216415A1
公开(公告)日：2023-07-06
申请号：US18174301
申请日：2023-02-24
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
CPC classification number: H02M3/1584 , H03K5/2481
Abstract: A preprocessing circuit for a comparator has a high voltage selection circuit, a first constant voltage circuit, a second constant voltage circuit, a first transistor, and a second transistor. The high voltage selection circuit receives a first voltage and a second voltage, and provides a selected voltage. The first constant voltage circuit provides a first clamping voltage based on the selected voltage, and the second constant voltage circuit provides a second clamping voltage based on the selected voltage. The first transistor receives the first voltage and the first clamping voltage, and provides a first comparison voltage to a first comparison terminal of the comparator. The second transistor receives the second voltage and the second clamping voltage, and provides a second comparison voltage to a second comparison terminal of the comparator.
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公开(公告)号：US11609271B2
公开(公告)日：2023-03-21
申请号：US17507419
申请日：2021-10-21
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
IPC: G01R31/28 , G01R31/3185
Abstract: A clock self-testing method and circuit. The clock self-testing method includes introducing a first clock signal and a second clock signal, counting cycles of the first clock signal and the second clock signal respectively beginning at the same moment, and if one of the number of cycles of the first clock signal being counted and the number of cycles of the second clock signal being counted is equal to N, determining whether the remained number of cycles is in a count range from M to N. If the remained number of cycles is out of the count range from M to N, the first clock signal and the second clock signal have errors.
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公开(公告)号：US11343886B2
公开(公告)日：2022-05-24
申请号：US16999290
申请日：2020-08-21
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Huafei Ding , Changxian Zhong
IPC: H05B45/14
Abstract: A light-emitting element driving device and controller and dimming method for the light-emitting element driving device. The light-emitting driving device has a dimming resistor and a power converter. A first current is provided to the dimming resistor, and a voltage across the dimming resistor is compared with a first threshold voltage. Then a second current is provided according to the comparison result. A dimming signal is generated based the voltage across the dimming resistor and a current flowing through the dimming resistor, to control the power converter to drive a plurality of light-emitting elements. A plurality of voltage windows may be configured for the dimming signal. a 2-step dimming function may be activated for high precision.
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公开(公告)号：US20220146576A1
公开(公告)日：2022-05-12
申请号：US17507419
申请日：2021-10-21
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
IPC: G01R31/3185
Abstract: A clock self-testing method and circuit. The clock self-testing method includes introducing a first clock signal and a second clock signal, counting cycles of the first clock signal and the second clock signal respectively beginning at the same moment, and if one of the number of cycles of the first clock signal being counted and the number of cycles of the second clock signal being counted is equal to N, determining whether the remained number of cycles is in a count range from M to N. If the remained number of cycles is out of the count range from M to N, the first clock signal and the second clock signal have errors.
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公开(公告)号：US10020734B2
公开(公告)日：2018-07-10
申请号：US15633688
申请日：2017-06-26
Applicant: Chengdu Monolithic Power Systems Co., Ltd.
Inventor： Changxian Zhong
IPC: G05F1/00 , H02M3/156 , H02M3/158 , H04W76/04 , H03K17/16 , H03M1/80 , H03M1/52 , H03M1/10 , H04W76/23 , H02M1/00
CPC classification number: H02M3/158 , H02M1/36 , H02M2001/0025 , H02M2001/0032 , H03K3/017 , H03K17/16 , H03M1/1014 , H03M1/1023 , H03M1/52 , H03M1/804 , H04W76/23
Abstract: An auto calibration method used in switching converters with constant on-time control. The auto calibration method includes: generating a periodical clock signal with a predetermined duty cycle; providing a first voltage and a second voltage to an on-time control circuit to generate an on-time control signal based on the first and second voltage; providing the clock signal and on-time control signal to a logic circuit to generate a switch control signal based on the clock signal and on-time control signal; comparing the duty cycle of the switch control signal with the duty cycle of the clock signal to adjust a calibration code signal; and adjusting circuit parameters of the on-time control circuit in accordance with the calibration code signal.
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