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    • 2. 发明申请
    • MULTIPHASE LOW LC BUCK REGULATOR
    • 多相低LC降压调节器
    • US20140021931A1
    • 2014-01-23
    • US14009740
    • 2011-06-06
    • Deepak PancholiBhavin Odedara
    • Deepak PancholiBhavin Odedara
    • H02M1/08
    • H02M1/08H02M3/1584
    • A buck power converter creates a desired output voltage from a greater input voltage with higher efficiency than linear regulators or charge pumps. For compact-size and cost sensitive products, the use of the buck power converter is hindered mainly because of lack of physical space and increases in the cost of the passive components like the inductor and capacitor. Techniques are presented to reduce the sizes of the passive components so that they can be integrated on-chip or in-package or on board. A signal converter in the buck power converter determines the duty cycle of a switching control signal. The switching control signal would ordinarily have driven a power switching circuit that provides current to the inductor in the buck power converter. The signal converter outputs a modified (multiphase) switching control signal that includes multiple separated on-periods that taken together approximate the duty cycle of the switching control signal while maintaining the same control loop frequency. The multiphase switching signal drives the power switching circuit to provide current to the inductor during each of the multiple separated on-periods so that the output voltage ripple decreases by a factor of the number of phases in the modified switching signal. In this way, if the ripple amplitude is kept same, the sizes of the passive components can be reduced by the factor of the number of phases in the modified switching control signal.
    • 降压功率转换器从更大的输入电压产生所需的输出电压,效率高于线性稳压器或电荷泵。 对于紧凑型和成本敏感的产品,降低功率转换器的使用主要是由于物理空间不足以及无源器件(如电感器和电容器)的成本增加而受到阻碍。 提出了减少无源元件尺寸的技术,使其可以集成在片上或封装内或板上。 降压功率转换器中的信号转换器确定开关控制信号的占空比。 开关控制信号通常会驱动向降压功率转换器中的电感器提供电流的功率开关电路。 信号转换器输出修改的(多相)开关控制信号,其包括多个分离的接通周期,其大致接近开关控制信号的占空比,同时保持相同的控制回路频率。 多相开关信号驱动功率开关电路,以在多个分离的导通周期中的每一个期间向电感器提供电流,使得输出电压纹波在修改的开关信号中的相位数量减小。 以这种方式,如果纹波幅度保持相同,则可以通过修改的开关控制信号中的相数的因数来减小无源部件的尺寸。
    • 4. 发明授权
    • Multiphase low LC buck regulator
    • US09627954B2
    • 2017-04-18
    • US14009740
    • 2011-06-06
    • Deepak PancholiBhavin Odedara
    • Deepak PancholiBhavin Odedara
    • H02M3/158H02M1/08
    • H02M1/08H02M3/1584
    • A buck power converter creates a desired output voltage from a greater input voltage with higher efficiency than linear regulators or charge pumps. For compact-size and cost sensitive products, the use of the buck power converter is hindered mainly because of lack of physical space and increases in the cost of the passive components like the inductor and capacitor. Techniques are presented to reduce the sizes of the passive components so that they can be integrated on-chip or in-package or on board. A signal converter in the buck power converter determines the duty cycle of a switching control signal. The switching control signal would ordinarily have driven a power switching circuit that provides current to the inductor in the buck power converter. The signal converter outputs a modified (multiphase) switching control signal that includes multiple separated on-periods that taken together approximate the duty cycle of the switching control signal while maintaining the same control loop frequency. The multiphase switching signal drives the power switching circuit to provide current to the inductor during each of the multiple separated on-periods so that the output voltage ripple decreases by a factor of the number of phases in the modified switching signal. In this way, if the ripple amplitude is kept same, the sizes of the passive components can be reduced by the factor of the number of phases in the modified switching control signal.
    • 9. 发明申请
    • Controlled Load Regulation and Improved Response Time of LDO with Adapative Current Distribution Mechanism
    • 控制负载调节和改善LDO与适应电流分布机制的响应时间
    • US20110181257A1
    • 2011-07-28
    • US12693228
    • 2010-01-25
    • Deepak PancholiBhavin OdedaraNaidu Prasad
    • Deepak PancholiBhavin OdedaraNaidu Prasad
    • G05F1/10
    • G05F1/575
    • A low drop-out (LDO) voltage regulation circuit includes first and second internal current paths. The first internal current path is between the input supply voltage and ground and includes the regulator's buffer circuit. The second internal current path is between the input supply voltage and ground and includes the regulator's power transistor. The amount of current flowing through the first internal current path relative to the amount of current flowing through the second internal current path is an increasing function of a current supplied to a load connected to the output supply node. The load regulation of the LDO is improved as the DC gain will not go down at lower load currents. Further, the no load to full load response time is improved as the load pole and power MOS gate pole are actively controlled with respect to output load current. In this mechanism, as the amount of current being supplied to the load decreases, the internal current flow shifts from the first internal current path to the second internal current path and vice versa. This arrangement maintains the desired pole structure and keeps the quiescent current largely the same for all load current levels.
    • 低压差(LDO)电压调节电路包括第一和第二内部电流路径。 第一条内部电流路径位于输入电源电压和地之间,并包括稳压器的缓冲电路。 第二个内部电流路径位于输入电源电压和地之间,并包括稳压器的功率晶体管。 流过第一内部电流路径的电流相对于流过第二内部电流路径的电流量是提供给连接到输出电源节点的负载的电流的增加函数。 由于直流增益在较低的负载电流下不会下降,所以LDO的负载调节得到改善。 此外,随着负载极和功率MOS栅极相对于输出负载电流被主动地控制,空载负载响应时间得到改善。 在该机构中,当供给到负载的电流量减少时,内部电流从第一内部电流路径移动到第二内部电流路径,反之亦然。 这种布置保持所需的极结构并且在所有负载电流水平下保持静态电流大体相同。