公开(公告)号：US20040227549A1

公开(公告)日：2004-11-18

申请号：US10784365

申请日：2004-02-23

Applicant: Intersil Americas Inc.

Inventor： Eric M. Solie

IPC: H03K004/06

CPC classification number: H03K4/502 ,  H03K3/011 ,  H03K3/0231 ,  H03K4/06

Abstract: A high bandwidth, feed-forward oscillator generates a ramp or sawtooth voltage for controlling the operation of a pulse width modulator-based, switched DC power supply circuit. The oscillator is operative to effectively immediately adjust the slope of each rising and falling portion of the ramp/sawtooth signal, as necessary, in proportion to the magnitude of the input voltage, while maintaining the frequency of the ramp waveform effectively constant. A comparator network establishes a difference between peak and valley portions of the sawtooth in accordance with input voltage. In response to a change in input voltage a control circuit modifies the value of the difference between the peak and valley portions to define a new set of respective peak and valley portions VpeakNEW and VvalleyNEW, and immediately causes the sawtooth waveform to transition to the new set of respective peak and valley portions VpeakNEW and VvalleyNEW at said prescribed frequency.

Abstract translation: 高带宽前馈振荡器产生斜坡或锯齿波电压，用于控制基于脉宽调制器的开关式直流电源电路的工作。 振荡器可操作以根据需要有效地立即根据输入电压的幅度调整斜坡/锯齿波信号的每个上升和下降部分的斜率，同时保持斜坡波形的频率有效地恒定。 比较器网络根据输入电压建立锯齿波峰谷部分之间的差异。 响应于输入电压的变化，控制电路修改峰谷部分之间的差值，以定义一组新的相应的峰谷部分Vpeak NEW和VvalleyNEW，并立即使锯齿波形转换到新集合 在所述规定频率下的各个峰谷部分Vpeak NEW和Vvalley NEW。