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公开(公告)号：US10468978B2
公开(公告)日：2019-11-05
申请号：US15465487
申请日：2017-03-21
Applicant: Linear Technology Corporation
Inventor： Xu Zhang , Jian Li , San Hwa Chee
Abstract: Methods and systems of pre-balancing a switched capacitor converter are provided. A first comparator includes a positive input configured to receive a voltage across an output capacitor and a negative input configured to receive a first hysteresis voltage. A second comparator includes a positive input configured to receive a voltage across an input capacitor of the switched capacitor converter and a negative input configured to receive a second hysteresis voltage. A first current source is coupled between the output capacitor and GND and is configured to discharge the output capacitor upon determining that the voltage across the output capacitor is above a tolerance provided by the first hysteresis voltage. A second current source is coupled between the input capacitor and GND and is configured to discharge the input capacitor upon determining that the voltage across the input capacitor is above a tolerance provided by the second hysteresis voltage.
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公开(公告)号：US20180019666A1
公开(公告)日：2018-01-18
申请号：US15465504
申请日：2017-03-21
Applicant: Linear Technology Corporation
Inventor： Xu Zhang , Jian Li , San Hwa Chee
CPC classification number: H02M3/07 , H02M1/08 , H02M1/36 , H02M3/073 , H02M2003/072
Abstract: A method and system of driving a switched capacitor converter having a plurality of switches. A first driver coupled to a first switch is powered by providing a first reference voltage level VCC to a first supply and a GND reference to a second supply node of the first driver. A second driver coupled to a second switch is powered by providing a unidirectional path between the first supply node of a first driver and the first supply node of the second driver and by keeping OFF the second switch while turning ON the first switch. A third driver coupled to a third switch is powered by providing a unidirectional path between the first supply node of a second driver and the first supply node of the third driver and by keeping OFF the first and third switch while turning ON the second switch.
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公开(公告)号：US20180019665A1
公开(公告)日：2018-01-18
申请号：US15465339
申请日：2017-03-21
Applicant: Linear Technology Corporation
Inventor： Xu Zhang , Jian Li , San Hwa Chee
IPC: H02M3/07
CPC classification number: H02M3/07 , H02M1/08 , H02M1/36 , H02M3/073 , H02M2003/072
Abstract: Methods and systems of controlling a switched capacitor converter are provided. Upon determining that a voltage across a flying capacitor is above a first threshold, a first current is drawn from a first terminal of the flying capacitor by a first current source, and a second current is provided to a second terminal of the flying capacitor by a second current source. Upon determining that the voltage across the flying capacitor is below a second threshold, the first current is provided to the first terminal of the flying capacitor by the first current source, and the second current is drawn from the second terminal of the flying capacitor by the second current source. Upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, the first and second current sources are turned OFF.
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公开(公告)号：US09614436B2
公开(公告)日：2017-04-04
申请号：US13963880
申请日：2013-08-09
Applicant: Linear Technology Corporation
Inventor： Jian Li
CPC classification number: H02M3/156 , H02M2003/1566
Abstract: A method and a circuit dynamically adjust a frequency of a clock signal that drives the operations of a power converter. The method includes (a) detecting a change from a predetermined value in an output voltage of the power converter; and (b) upon detecting the change, changing the frequency of the clock signal so as to restore the output voltage. The change, such as a load step-up, may be detected by comparing a feedback signal generated from the output voltage and a predetermined threshold voltage. In one implementation, changing the switching frequency is achieved in increasing (e.g., doubling) the frequency of the clock signal, as needed. The frequency of the clock signal need only be changed for a predetermined time period.
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公开(公告)号：US10534384B2
公开(公告)日：2020-01-14
申请号：US15585399
申请日：2017-05-03
Applicant: Linear Technology Corporation
Inventor： Gregory Manlove , James McKenzie , Robert Chiacchia , Yi Ding Gu , Jian Li
Abstract: A current mode switching regulator circuit and operating method includes a variable duty cycle power switch controller, a voltage feedback loop that provides a feedback signal based on the output voltage, a current feedback loop that provides a current sense signal based on the output current, and an offset circuit having an external signal input and coupled to the current feedback loop. The power switch controller controls the switching regulator circuit to generate an output voltage and an output current. The offset circuit is configured to provide an offset output control signal, independently of the voltage feedback loop, to control the power switch controller so as to vary a duty cycle of the power switch controller based on the current sense signal and an external offset signal applied to the external signal input.
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Patent Agency Ranking
公开(公告)号：US10033301B2
公开(公告)日：2018-07-24
申请号：US15407749
申请日：2017-01-17
Applicant: LINEAR TECHNOLOGY CORPORATION
Inventor： Jindong (Henry) Zhang , Jian Li
Abstract: A power interface device includes a main switching converter and an auxiliary switching converter. The main switching converter is coupled to an input terminal and an output terminal and configured to operate at a first switching frequency to source a low frequency current from the input terminal to the output terminal. The auxiliary switching converter is coupled to the input terminal and the output terminal in parallel with the main switching converter and configured to operate at a second and higher switching frequency than the first switching frequency to source a fast transient high frequency current from the input terminal to the output terminal.
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公开(公告)号：US09998000B2
公开(公告)日：2018-06-12
申请号：US15465339
申请日：2017-03-21
Applicant: Linear Technology Corporation
Inventor： Xu Zhang , Jian Li , San Hwa Chee
CPC classification number: H02M3/07 , H02M1/08 , H02M1/36 , H02M3/073 , H02M2003/072
Abstract: Methods and systems of controlling a switched capacitor converter are provided. Upon determining that a voltage across a flying capacitor is above a first threshold, a first current is drawn from a first terminal of the flying capacitor by a first current source, and a second current is provided to a second terminal of the flying capacitor by a second current source. Upon determining that the voltage across the flying capacitor is below a second threshold, the first current is provided to the first terminal of the flying capacitor by the first current source, and the second current is drawn from the second terminal of the flying capacitor by the second current source. Upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, the first and second current sources are turned OFF.
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8.发明授权Switched capacitor DC-DC converter with reduced in-rush current and fault protection 有权开关电容器DC-DC转换器具有降低的浪涌电流和故障保护公开(公告)号：US09484799B2
公开(公告)日：2016-11-01
申请号：US14592476
申请日：2015-01-08
Applicant: Linear Technology Corporation
Inventor： Jindong Zhang , Jian Li
CPC classification number: H02M1/32 , H02M1/36 , H02M3/07 , H02M3/156 , H02M3/158 , H02M3/1582 , H02M3/1588
Abstract: To reduce in-rush currents into a switched capacitor DC/DC converter and detect voltage and current faults, a converter controller is housed along with a current limit series transistor and fault detection circuitry. The series transistor is controlled to limit the in-rush current to a predetermined maximum level during start-up. If the duration of the current limit level, or the time for Vout to achieve a target voltage, exceeds a first threshold time, a first fault detector in the package shuts off the series transistor. During steady state operation, if the input current reaches the limit for a second threshold time or if Vout extends outside a certain range for the second threshold time, a second fault detector in the package shuts off the series transistor.
Abstract translation: 为了减少冲击电流进入开关电容器DC / DC转换器并检测电压和电流故障，转换器控制器与电流限制串联晶体管和故障检测电路一起安装。 控制串联晶体管以在启动期间将浪涌电流限制到预定的最大电平。 如果电流限制电平的持续时间或Vout达到目标电压的时间超过第一阈值时间，则封装中的第一故障检测器关闭串联晶体管。 在稳态操作期间，如果输入电流达到第二阈值时间的限制，或者如果Vout在第二阈值时间内超出一定范围，则封装中的第二故障检测器关闭串联晶体管。
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9.发明申请CURRENT MODE SWITCHING POWER SUPPLY HAVING SEPARATE AC AND DC CURRENT SENSING PATHS 有权具有独立交流和直流电流感应电路的电流模式开关电源公开(公告)号：US20160164412A1
公开(公告)日：2016-06-09
申请号：US14755336
申请日：2015-06-30
Applicant: Linear Technology Corporation
Inventor： Jian Li , Yingyi Yan , Xu Zhang , Zhouyuan Shi
IPC: H02M3/158
CPC classification number: H02M3/1588 , G01R19/0092 , G01R31/40 , H02M3/156 , H02M2001/0009
Abstract: In a current mode switching power supply, current through the inductor needs to be sensed to control the peak current. The inductor current includes a DC component and an AC component containing switching noise. To reduce the switching noise, the actual inductor current is sensed to generate a signal, and a first AC component is attenuated by a first RC circuit while not attenuating a first DC component. A second AC component is derived by applying the rectangular wave switch voltage, which is at the duty cycle of the regulator, to a second RC filter, which blocks a second DC component. The second AC component is much larger than the first AC component and does not contain switching noise. The large second AC component, the smaller “noisy” first AC component, and the first DC component are applied to the first RC circuit to create a low-noise inductor current signal.
Abstract translation: 在电流模式切换电源中，需要检测通过电感的电流来控制峰值电流。 电感电流包括DC分量和包含开关噪声的AC分量。 为了减小开关噪声，感测实际的电感电流以产生信号，并且第一AC分量由第一RC电路衰减而不衰减第一DC分量。 通过将处于调节器的占空比的矩形波开关电压施加到阻塞第二DC分量的第二RC滤波器来导出第二AC分量。 第二个交流分量比第一个交流分量大得多，不包含开关噪声。 大的第二AC分量，较小的“噪声”第一AC分量和第一DC分量被施加到第一RC电路以产生低噪声电感器电流信号。
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公开(公告)号：US20160087531A1
公开(公告)日：2016-03-24
申请号：US14677794
申请日：2015-04-02
Applicant: Linear Technology Corporation
Inventor： Xu Zhang , Jian Li , Zhouyuan Shi , Yi Ding Gu
IPC: H02M3/158
CPC classification number: H02M3/1582 , H02M2001/0009
Abstract: An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.
Abstract translation: 用于测量电感器中的电流的电感器电流感测电路包括（a）耦合在电感器的第一端子和参考电压源之间的第一RC网络; 和（b）耦合在电感器的第二端子和参考电压源之间的第二RC网络。 第一RC网络和第二RC网络各自具有基本上等于电感器和电感器的直流电阻之间的比率的时间常数。 正在测量电流的电感器可以是接收输入电压并提供输出电压的四开关降压升压转换器的初级电感器。
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