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1. 发明申请

WO2008006381A2 SELF-OSCILLATING MODULATOR WITH IMPROVED SYNCHRONISATION AND PWM CYCLE CONSTRAINTS 审中-公开
标题翻译：具有改进的同步和PWM周期约束的自振荡调制器
公开(公告)号：WO2008006381A2
公开(公告)日：2008-01-17
申请号：PCT/DK2007050091
申请日：2007-07-11
申请人： TC ELECTRONIC AS , ARKNAES-PEDERSEN LARS , PEDERSEN KIM RISHOEJ
发明人： ARKNAES-PEDERSEN LARS , PEDERSEN KIM RISHOEJ
IPC分类号： H03K3/08 , H03F3/217
CPC分类号： H03M1/508
摘要： The present invention relates to a self-oscillating modulator 2 comprising a PWM cycle constrainer 21. The present invention further relates to a method of stabilising the switch frequency of a self-oscillating modulator operating on a high level input signal, whereby at least one PWM cycle constraint representative signal 26; 32, 33 is applied to a pulse width modulated signal 18 within said self-oscillating modulator 2. The present invention further relates to a method of avoiding pulses narrower than a predetermined minimum pulse width or wider than a predetermined maximum pulse width in a self-oscillating modulator 2 operating on a high level input signal, whereby at least one PWM cycle constraint representative signal 26; 32, 33 is applied to a pulse width modulated signal 18 within said self-oscillating modulator. The present invention further relates to a method of providing at least one PWM cycle constraint representative signal 26; 32, 33 for use in a self-oscillating modulator, whereby said PWM cycle constraint representative signal is established by the steps of: providing a periodic signal 17; 25; 31 by means of a reference signal generator 22, providing a square wave signal 31 on the basis of, and in synchrony with, said periodic signal 17; 25, and providing said PWM cycle constraint representative signal 26; 32, 33 on the basis of, and in synchrony with, said square wave signal 31.
摘要翻译：本发明涉及一种包括PWM周期约束器21的自振荡调制器2.本发明还涉及一种稳定在高电平输入信号上工作的自振荡调制器的开关频率的方法，由此至少一个PWM 循环约束代表信号26; 32,33被施加到所述自振荡调制器2内的脉冲宽度调制信号18上。本发明还涉及一种在自谐振调制器2中避免比预定最小脉冲宽度窄或宽于预定最大脉冲宽度的脉冲的方法，振荡调制器2在高电平输入信号上工作，由此至少一个PWM周期约束代表信号26; 32,33被施加到所述自振荡调制器内的脉宽调制信号18。本发明还涉及提供至少一个PWM周期约束代表信号26的方法; 32,33用于自振荡调制器，由此所述PWM周期约束代表信号通过以下步骤建立：提供周期性信号17; 25; 31，借助于参考信号发生器22，基于并与所述周期信号17同步地提供方波信号31; 25，并提供所述PWM周期约束代表信号26; 32,33基于并且与所述方波信号31同步。

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