Invention Grant
- Patent Title: Systems and methods to minimize startup transients in class D amplifiers
- Patent Title (中): 减少D类放大器启动瞬变的系统和方法
-
Application No.: US11847449Application Date: 2007-08-30
-
Publication No.: US07791427B2Publication Date: 2010-09-07
- Inventor: Michael A. Kost
- Applicant: Michael A. Kost
- Applicant Address: US CA Milpitas
- Assignee: D2Audio Corporation
- Current Assignee: D2Audio Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Fliesler Meyer LLP
- Main IPC: H03K7/08
- IPC: H03K7/08

Abstract:
Systems and methods for minimizing startup transients in digital audio controllers that may result in audible artifacts in the output of an audio amplification system. One embodiment comprises a digital PWM amplifier that includes a mechanism for controlling the amount of dead time in the audio output signal. When the amplifier starts up, the PWM signals provided to the output stage are simultaneously deasserted (i.e., there is dead time) for most of each switch period. The amount of dead time is gradually reduced over a series of switch periods until a nominal operating amount of dead time in each switch period is reached. Thus, the PWM signals are slowly ramped up from having a very large percentage of dead time (e.g., nearly 100%) to having a very small percentage of dead time (e.g., 1-2% to prevent shoot-through.)
Public/Granted literature
- US20090058549A1 Systems and Methods to Minimize Startup Transients in Class D Amplifiers Public/Granted day:2009-03-05
Information query