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1. 发明授权

US06462970B2 SMPS protection circuit in electronic appliance 有权
公开(公告)号：US06462970B2
公开(公告)日：2002-10-08
申请号：US09939830
申请日：2001-08-28
申请人： Sang Yeal Kim
发明人： Sang Yeal Kim
IPC分类号： H02M704
CPC分类号： H02M1/32 , H02M3/33523 , H02M2001/0032 , Y02B70/16
摘要： Disclosed is an SMPS protection circuit, which can prevent unnecessary electric power consumption that may be caused due to a light load as well as damage of the SMPS protection circuit caused by a heavy load. According to the SMPS protection circuit, a voltage lowered by the load is fed back. If the fed-back voltage corresponds to the light load, the switching frequency of an SMPS transformer is downed. If the fed-back voltage corresponds to the heavy load, the SMPS protection circuit ceases to operate.

2. 发明授权

US5946201A Boost-up power factor correcting circuit using a power feedback 失效
标题翻译：使用功率反馈的升压功率因数校正电路
公开(公告)号：US5946201A
公开(公告)日：1999-08-31
申请号：US098003
申请日：1998-06-16
申请人： Sang Yeal Kim
发明人： Sang Yeal Kim
IPC分类号： H02M7/02 , H02M1/00 , H02M1/42 , H02M3/335
CPC分类号： H02M1/4258 , Y02B70/126
摘要： A boost-up power factor correcting circuit using a power feed back capable of stably supplying the power source to the load by correcting a power factor, so that the power is fed-back in a high-frequency current using an auxiliary winding to be included in an SMPS transformer. The circuit includes a rectifying section for rectifying an inputted AC voltage, an inductor transformer, having a first inductor winding connected to the rectifying section and a second inductor winding, for accumulating a magnetic energy, an SMPS transformer having a primary winding connected to the first inductor winding of the inductor transformer and an auxiliary winding connected to the second inductor winding of the inductor transformer, the auxiliary winding generating a voltage having a phase opposite to that of a voltage applied to the primary winding, a power feedback section connecting in a closed loop the auxiliary winding of the SMPS transformer and the second inductor winding, for feedingback the magnetic energy accumulated at the auxiliary winding, and a switching control section connected to the primary winding of the SMPS transformer, for controlling the switching operation of the SMPS transformer.
摘要翻译：一种升压功率因数校正电路，其使用能够通过校正功率因数来稳定地向负载提供电源的反馈功能，从而使用要包括的辅助绕组在高频电流中反馈功率在SMPS变压器中。电路包括用于整流输入的AC电压的整流部分，具有连接到整流部分的第一电感器绕组和用于累积磁能的第二电感器绕组的电感器变压器，具有连接到第一电感器的初级绕组的SMPS变压器电感器变压器的电感器绕组和连接到电感器变压器的第二电感器绕组的辅助绕组，辅助绕组产生具有与施加到初级绕组的电压相反的相位的电压;功率反馈部分，其在闭合使SMPS变压器和第二电感线圈的辅助绕组回路，用于馈送在辅助绕组上累积的磁能，以及连接到SMPS变压器的初级绕组的开关控制部分，用于控制SMPS变压器的开关操作。

3. 发明授权

US5910887A Apparatus for controlling switching frequency of SMPS transformer for video display appliance 失效
标题翻译：用于控制视频显示设备的SMPS变压器开关频率的装置
公开(公告)号：US5910887A
公开(公告)日：1999-06-08
申请号：US988043
申请日：1997-12-10
申请人： Sang Yeal Kim
发明人： Sang Yeal Kim
IPC分类号： H02M3/335 , H04N3/185 , H01J29/70
CPC分类号： H04N3/185 , H02M3/33523
摘要： An apparatus for controlling a switching frequency of a switching mode power supply (SMPS) for a video display appliance which can remove a switching noise generated during the switching-on and switching-off operations of an SMPS transformer by controlling the switching frequency of the SMPS transformer so that the duty of the SMPS transformer is kept in a predetermined range. The apparatus includes a flyback transformer for converting the voltage outputted from the SMPS transformer into a high voltage in accordance with a horizontal sync signal inputted thereto, a control section for outputting a control signal in accordance with the horizontal sync signal, a dividing section for dividing the horizontal sync signal in accordance with the control signal, a pulse transformer for outputting a predetermined pulse signal in accordance with an output pulse signal of the dividing section, a differentiation section for differentiating the pulse signal outputted from the pulse transformer to eliminate a negative pulse component of the pulse signal, a sawtooth sync generating section for generating a sawtooth sync signal by performing a switching operation in accordance with an output signal of the differentiation section, and a switching control section for outputting the switching frequency for a switching operation of the SMPS transformer in accordance with the sawtooth sync signal.
摘要翻译：一种用于控制用于视频显示设备的开关模式电源（SMPS）的开关频率的装置，其可以通过控制SMPS的开关频率来消除在SMPS变压器的接通和关断操作期间产生的开关噪声变压器，使得SMPS变压器的占空比保持在预定范围内。该装置包括用于根据输入的水平同步信号将从SMPS变压器输出的电压转换成高电压的回扫变压器，用于根据水平同步信号输出控制信号的控制部分，根据控制信号的水平同步信号，用于根据分割部分的输出脉冲信号输出预定脉冲信号的脉冲变压器，用于区分从脉冲变压器输出的脉冲信号以消除负脉冲的微分部分脉冲信号的分量，锯齿波同步产生部分，用于通过根据微分部分的输出信号执行切换操作来产生锯齿波同步信号;以及切换控制部分，用于输出用于SMPS的切换操作的切换频率变压器按照sa WCDMA同步信号。

4. 发明授权

US5909361A Output voltage stabilizing circuit of a power factor correction circuit at an initial power-on stage 失效
标题翻译：初始上电阶段功率因数校正电路的输出稳压电路
公开(公告)号：US5909361A
公开(公告)日：1999-06-01
申请号：US922774
申请日：1997-09-03
申请人： Sang Yeal Kim
发明人： Sang Yeal Kim
IPC分类号： H02M3/10 , H02M1/00 , H02M1/36 , H02M1/42 , H02M3/335
CPC分类号： H02M1/4225 , H02M1/36 , Y02B70/126
摘要： An output voltage stabilizing circuit of a power factor correction circuit, which initially stabilizes an output voltage of a power factor correction circuit by controlling an on/off timing of a reference oscillating waveform which varies in response to an error voltage in accordance with a charge/discharge voltage outputted from a soft start circuit section. The output voltage stabilizing circuit includes a flyback transformer (FBT) connected to a secondary winding of an output transformer for applying a high voltage and outputting a sync signal, a first control driving section for outputting a switching control signal of the FBT, a soft start circuit for charging or discharging according to a first output of the SMPS transformer, a switching section for controlling the operation of charging or discharging of the soft start circuit in response to the sync signal of the FBT, an error amplifier for amplifying the output voltage of the power factor correction circuit section according to the switching operation of the switching section, comparing section for comparing an output voltage of the error amplifier with the initial output voltage of the power factor correction circuit section and outputting a voltage as a result of comparison, and a second control driving section for controlling a duty ratio to stabilize the initial output voltage of the power factor correction circuit section according to the output voltage of the comparing section.
摘要翻译：一种功率因数校正电路的输出稳压电路，其通过控制基准振荡波形的导通/截止定时来初始稳定功率因数校正电路的输出电压，该基准振荡波形根据电荷/ 从软启动电路部分输出的放电电压。输出稳压电路包括连接到输出变压器的次级绕组的反激变压器（FBT），用于施加高电压并输出同步信号;第一控制驱动部分，用于输出FBT的开关控制信号;软启动用于根据SMPS变压器的第一输出充电或放电的电路，用于响应于FBT的同步信号控制软起动电路的充电或放电操作的开关部分，用于放大FBT的输出电压的误差放大器功率因数校正电路部分，根据切换部分的切换操作，比较部分，用于将误差放大器的输出电压与功率因数校正电路部分的初始输出电压进行比较，并输出作为比较结果的电压;以及用于控制占空比以稳定初始输出电压o的第二控制驱动部分 f是功率因数校正电路部分，根据比较部分的输出电压。

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