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1. 发明申请

US20090218999A1 DC converter which has switching control unit to select PWM signal or PFM signal 失效
标题翻译： DC转换器具有选择PWM信号或PFM信号的开关控制单元
公开(公告)号：US20090218999A1
公开(公告)日：2009-09-03
申请号：US12320981
申请日：2009-02-10
申请人： Hidehiro Kikuchi
发明人： Hidehiro Kikuchi
IPC分类号： G05F1/00
CPC分类号： H02M3/156
摘要： A DC (direct current) converter includes a PWM (pulse width modulation) pulse generation unit outputting a PWM pulse signal whose duty ratio is controlled in accordance with an output voltage, a PFM (pulse frequency modulation) pulse generation unit outputting a PFM pulse signal whose pulse output interval is controlled in accordance with an output voltage, a selection circuit selecting and outputting any one of the PWM pulse signal and the PFM pulse signal in response to a selection signal, a drive circuit unit driving a load and generating an output voltage on the basis of a signal outputted from the selection circuit, and a switching control unit outputting the selection signal. When the selection signal is in a second state, the switching control unit detects a fact that the number of pulses of the PFM pulse signal in a measurement period increases to or above a set value of the maximum number of pulses, and switches the selection signal to a first state.
摘要翻译： DC（直流）转换器包括PWM（脉冲宽度调制）脉冲产生单元，输出根据输出电压控制占空比的PWM脉冲信号; PFM（脉冲频率调制）脉冲产生单元，输出PFM脉冲信号其脉冲输出间隔根据输出电压进行控制，选择电路响应于选择信号选择并输出PWM脉冲信号和PFM脉冲信号中的任何一个，驱动电路单元驱动负载并产生输出电压基于从选择电路输出的信号，以及切换控制单元输出选择信号。当选择信号处于第二状态时，切换控制单元检测在测量周期中PFM脉冲信号的脉冲数增加到或超过最大脉冲数的设定值的事实，并且切换选择信号到第一个状态。

2. 发明授权

US08035365B2 DC converter which has switching control unit to select PWM signal or PFM signal 失效
标题翻译： DC转换器具有选择PWM信号或PFM信号的开关控制单元
公开(公告)号：US08035365B2
公开(公告)日：2011-10-11
申请号：US12320981
申请日：2009-02-10
申请人： Hidehiro Kikuchi
发明人： Hidehiro Kikuchi
IPC分类号： G05F1/00
CPC分类号： H02M3/156
摘要： A DC (direct current) converter includes a PWM (pulse width modulation) pulse generation unit outputting a PWM pulse signal whose duty ratio is controlled in accordance with an output voltage, a PFM (pulse frequency modulation) pulse generation unit outputting a PFM pulse signal whose pulse output interval is controlled in accordance with an output voltage, a selection circuit selecting and outputting any one of the PWM pulse signal and the PFM pulse signal in response to a selection signal, a drive circuit unit driving a load and generating an output voltage on the basis of a signal outputted from the selection circuit, and a switching control unit outputting the selection signal. When the selection signal is in a second state, the switching control unit detects a fact that the number of pulses of the PFM pulse signal in a measurement period increases to or above a set value of the maximum number of pulses, and switches the selection signal to a first state.
摘要翻译： DC（直流）转换器包括PWM（脉冲宽度调制）脉冲产生单元，输出根据输出电压控制占空比的PWM脉冲信号; PFM（脉冲频率调制）脉冲产生单元，输出PFM脉冲信号其脉冲输出间隔根据输出电压进行控制，选择电路响应于选择信号选择并输出PWM脉冲信号和PFM脉冲信号中的任何一个，驱动电路单元驱动负载并产生输出电压基于从选择电路输出的信号，以及切换控制单元输出选择信号。当选择信号处于第二状态时，切换控制单元检测在测量周期中PFM脉冲信号的脉冲数增加到或超过最大脉冲数的设定值的事实，并且切换选择信号到第一个状态。

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