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公开(公告)号：US09391508B2
公开(公告)日：2016-07-12
申请号：US14542086
申请日：2014-11-14
Applicant: Wolfson Microelectronics Ltd.
Inventor： John Paul Lesso , Peter John Frith , John Laurence Pennock
CPC classification number: H02M3/07 , H02M1/00 , H02M2001/0083 , H02M2001/009 , H03F3/181
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes and a second pair of output nodes, and two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first bipolar output voltage at the first pair of output nodes and a second bipolar output voltage at the second pair of bipolar output nodes.
Abstract translation: 一种双极性输出电荷泵电路，具有用于选择性地连接输入节点和用于连接到输入电压的参考节点的开关路径网络，第一对输出节点和第二对输出节点以及两对飞行电容器节点 以及用于控制切换路径的网络的切换的控制器。 控制器可操作以在与两对飞跨电容器节点连接的两个飞溅电容器一起使用时控制开关路径的网络，以在第一对输出节点处提供第一双极性输出电压，并且在第二对输出节点处提供第二双极性输出电压 第二对双极输出节点。
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公开(公告)号：US09473087B2
公开(公告)日：2016-10-18
申请号：US14521191
申请日：2014-10-22
Applicant: Wolfson Microelectronics Ltd.
Inventor： John Paul Lesso , Toru Ido
CPC classification number: H03F3/2171 , H03F1/0211 , H03F3/187 , H03F3/217 , H03F2200/165 , H03F2200/171 , H03F2200/333 , H03F2200/351 , H03G1/0088
Abstract: Methods and apparatus for Class-D amplifier circuits with improved power efficiency. The circuit has an output stage with at least first and second switches and a modulator that receives an input signal to be amplified, SIN, and a first clock signal fSW. The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.
Abstract translation: 具有提高功率效率的D类放大器电路的方法和装置。 电路具有至少具有第一和第二开关的输出级和接收要被放大的输入信号SIN和第一时钟信号fSW的调制器。 调制器基于输入信号在开关周期内控制第一和第二开关的占空比，其中开关周期具有基于第一时钟信号的开关频率。 频率控制器响应于输入信号的幅度的指示来控制第一时钟信号的频率，以便提供第一输入信号幅度的第一开关频率和在第二输入信号幅度下的第二，较低开关频率 ，输入信号幅度。 在低信号幅度下可以容忍较低的开关频率，并且以这种方式改变开关频率，从而在降低开关功率损耗的同时保持稳定性。
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公开(公告)号：US20150070082A1
公开(公告)日：2015-03-12
申请号：US14542086
申请日：2014-11-14
Applicant: Wolfson Microelectronics Ltd.
Inventor： John Paul Lesso , Peter John Frith , John Laurence Pennock
IPC: H02M3/07
CPC classification number: H02M3/07 , H02M1/00 , H02M2001/0083 , H02M2001/009 , H03F3/181
Abstract: A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes and a second pair of output nodes, and two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first bipolar output voltage at the first pair of output nodes and a second bipolar output voltage at the second pair of bipolar output nodes.
Abstract translation: 一种双极性输出电荷泵电路，具有用于选择性地连接输入节点和用于连接到输入电压的参考节点的开关路径网络，第一对输出节点和第二对输出节点以及两对飞行电容器节点 以及用于控制切换路径的网络的切换的控制器。 控制器可操作以在与两对飞跨电容器节点连接的两个飞溅电容器一起使用时控制开关路径的网络，以在第一对输出节点处提供第一双极性输出电压，并且在第二对输出节点处提供第二双极性输出电压 第二对双极输出节点。
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