-
公开(公告)号：US20240364281A1
公开(公告)日：2024-10-31
申请号：US18633590
申请日：2024-04-12
发明人： Donnie Herman
CPC分类号： H03F3/2171 , H03F1/303 , H03F3/45179 , H03F3/68 , H03F2200/168 , H03F2200/351 , H03F2200/78
摘要： A cascoded high-voltage amplifier with Class D-H preamplifier is disclosed. The cascoded amplifier can include a chain of series-coupled low-voltage amplifiers, sometimes with a common gain, where an output of each low-voltage amplifier is coupled to an input of a next low-voltage amplifier, and inputs of adjacent low-voltage amplifiers are coupled via a feedforward connection, and optionally through an impedance component. In this way, a change in the input signal to the preamplifier can level shift the entire chain of low-voltage amplifiers through the feedforward connections. The gain of the cascoded high-voltage amplifier can be a function of the number of low-voltage amplifiers plus that of the Class D-H preamplifier, and a high-voltage output can be achieved without seeing high-voltage drops within the amplifier.
-
公开(公告)号：US12088267B2
公开(公告)日：2024-09-10
申请号：US17585606
申请日：2022-01-27
发明人： Che-Wei Hsu , Wun-Long Yu
CPC分类号： H03G3/3015 , H02M3/1582 , H03F3/2178 , H03F2200/351
摘要： An audio amplifier with duty ratio control is provided. The audio amplifier comprises a pulse width modulation modulator, a power stage, and a voltage converter. The pulse width modulation modulator is configured to receive an input signal for generating a pulse width modulation signal. The power stage is configured to output an output signal according to a supply voltage and the pulse width modulation signal. The voltage converter is configured to adjust voltage level of the supply voltage according to the pulse width modulation signal. The audio amplifier is configured to adjust the voltage level of the supply voltage when duty ratio of the pulse width modulation signal is greater than a duty ratio threshold.
-
公开(公告)号：US20240213935A1
公开(公告)日：2024-06-27
申请号：US18088091
申请日：2022-12-23
CPC分类号： H03F3/2173 , H03F1/3205 , H03F2200/03 , H03F2200/351
摘要： Examples of amplifiers and components thereof are configured to adjust the OFF-pulse widths of a high-duty cycle pulse width modulated (PWM) output signal and the ON-pulse widths of a low-duty cycle PWM output signal. Such control is carried out using high- and low-side (HS and LS) detectors. The HS detector coupled to the control terminal of an HS transistor detects when the gate-to-source voltage (Vgs) of the HS transistor drops below a threshold and outputs an HS detection signal to adjust the OFF-pulse widths of the high-duty cycle PWM output signal. An LS detector coupled to the control terminal of an LS transistor detects when the Vgs of the LS transistor drops below the threshold and outputs a LS detection signal to adjust the ON-pulse widths of the low-duty cycle PWM output signal.
-
公开(公告)号：US12009791B2
公开(公告)日：2024-06-11
申请号：US17702312
申请日：2022-03-23
申请人： Analog Devices, Inc.
CPC分类号： H03F3/2175 , H03M3/412 , H03M3/464 , H04R3/02 , H03F2200/03 , H03F2200/331 , H03F2200/351
摘要： Systems and methods are provided for architectures for a digital class D driver that increase the power efficiency of the class D driver. In particular, systems and methods are provided for a digital class D driver having a feedback analog-to-digital converter (ADC) that can have a latency of 1 cycle or more than 1 cycle. A feedback ADC with a latency of 1 cycle or more is significantly lower power than a low latency feedback ADC. Systems and methods are disclosed for a power efficient digital class D driver architecture that allows for a latency of one or more cycles in the feedback ADC.
-
公开(公告)号：US20240186965A1
公开(公告)日：2024-06-06
申请号：US17505409
申请日：2021-10-19
发明人： Huafen Ouyang , Hualiang Li , Dongxin Jin
CPC分类号： H03F3/26 , H03F1/307 , H03F1/52 , H03F3/245 , H03F2200/351
摘要： The present invention provides a driving circuit for a switching transistor and a driving device including the same. The driving circuit includes: a power amplifier, including a first power transistor and a second power transistor that are connected between a first direct current voltage terminal and a second direct current voltage terminal and are arranged in a push-pull circuit; a first voltage regulating device, connected between an input terminal of the power amplifier and a control terminal of the first power transistor; a third power transistor, connected between an output terminal of the power amplifier and the second direct current voltage terminal or a grounding terminal; a first voltage dividing device, connected between the input terminal and the output terminal of the power amplifier; and a transistor control circuit, configured to: control the third power transistor to be turned on when the switching transistor is located in a short-circuit path, and control the third power transistor to be turned off when the switching transistor is controlled to be turned on and is not located in the short-circuit path. The driving circuit of the present invention reduces the power consumption of the switching transistor and extends the time for short-circuit protection.
-
公开(公告)号：US11942866B2
公开(公告)日：2024-03-26
申请号：US17381679
申请日：2021-07-21
发明人： Rajesh Karri , Arun Khamesra
CPC分类号： H02M3/1582 , G06F13/4282 , H03F1/0227 , H03F1/301 , H03F2200/351 , H03F2200/462
摘要： An error amplifier includes an output pin coupled to a pulse width modulation (PWM) comparator of a buck-boost converter. A first transconductance amplifier adjusts an output current at the output pin and operates in a constant voltage mode. The first transconductance amplifier includes a first positive input to receive a first voltage reference and a first negative input coupled to a tap point of a voltage divider coupled between a voltage bus and a ground of the buck-boost converter. A second transconductance amplifier also adjusts the output current at the output pin and operates in a constant current mode. The second transconductance amplifier includes a second positive input to receive a second voltage reference and a second negative input coupled to a current sense amplifier, the current sense amplifier being coupled to a sense resistor positioned inline along the voltage bus.
-
公开(公告)号：US11863135B2
公开(公告)日：2024-01-02
申请号：US17927847
申请日：2021-07-02
发明人： Xu Zhou , Hangjuan Jia , Dianjun Zhang , Fan Yang
CPC分类号： H03F3/2175 , H03F2200/351
摘要： A Class D power amplification modulation system for self-adaptive adjustment of an audio signal is provided, including an amplification circuit module, a pulse width modulation (PWM) circuit module connected to the amplification circuit module, a frequency detection circuit module, a carrier generator module connected to the frequency detection circuit module, an amplitude detection circuit module, a direct current (DC) potential adjustment module connected to the amplitude detection circuit module, and a drive circuit module. A method, a device, a processor, and a computer-readable storage medium are also provided. The characteristics of the circuit in the signal time domain and frequency are improved by simultaneously controlling the amplitude and the frequency of the audio signal, to minimize power consumption of signals with different amplitudes and frequencies, and to improve EMI performance, or to balance the circuit power consumption and EMI characteristics.
-
公开(公告)号：US20230412129A1
公开(公告)日：2023-12-21
申请号：US18206331
申请日：2023-06-06
IPC分类号： H03F3/217
CPC分类号： H03F3/2173 , H03F2200/03 , H03F2200/171 , H03F2200/351
摘要： A switching circuit includes first and second half bridges supplying an electrical load via filter networks. During alternate switching sequences a first transistor pair (high-side in one half bridge and low-side in the other half bridge) is switched to a non-conductive state, and a second transistor pair (high-side in the other half bridge and low-side in the one half bridge) is switched to a conductive state. A current flow line is provided by an inductance, a first switch and a second switch between outputs of the half bridges. In a medium-high power mode, the first and second switches are in the conductive state between switching the first pair of transistors to the non-conductive state and the second pair of transistors to the conductive state. In a low or quiescent power mode, switching the first and second switches to the conductive state is refrained due to application of a longer delay.
-
公开(公告)号：US11804809B2
公开(公告)日：2023-10-31
申请号：US17698640
申请日：2022-03-18
申请人： Robert Bosch GmbH
发明人： Markus Mandl , Gregor Sauer , Thomas Stein
CPC分类号： H03F3/2173 , H03F3/183 , H03F2200/03 , H03F2200/171 , H03F2200/351
摘要： In the field of audio amplifiers, the prior art for high output power levels is now to use class D technology. In this technology, audio signals are converted into a pulsed signal.
An audio amplifier 1 is proposed, with a modulator section 4 for accepting an input signal and outputting two intermediate signals, wherein the modulator section 4 is designed to generate the intermediate signals by modulating the input signal, with an amplifier section 8 for accepting the two intermediate signals and outputting two amplified signals, wherein the amplifier section 8 is designed to generate the two amplified signals by amplifying the two intermediate signals, the amplifier section having two power stages 11;12, with an end section 21 for accepting the two amplified signals and for outputting an output signal for a loudspeaker device 2, wherein the audio amplifier 1 can be switched between parallel operation and bridge operation.-
公开(公告)号：US11764742B2
公开(公告)日：2023-09-19
申请号：US17673822
申请日：2022-02-17
发明人： Tai-Haur Kuo
CPC分类号： H03F3/2173 , H03F1/0227 , H03F2200/03 , H03F2200/351 , H03F2200/462 , H03F2200/471
摘要： A switching amplifier comprises a controller, configured to receive an input signal and a reference signal, and to generate a control signal according to the input signal and the reference signal; a pulse-width modulation (PWM) modulator, coupled to the controller, configured to generate a PWM signal according to the input signal and the control signal; a power management unit, coupled to the controller, configured to receive a power supply and the control signal, and to provide an adaptive supply voltage according to the power supply and the control signal; and a switching power stage, coupled to the power management unit and the PWM modulator, configured to generate an output signal according to the PWM signal and the adaptive supply voltage.
-
-
-
-
-
-
-
-
-
搜索结果
965 条记录 (耗时 0.025 秒)
