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1. 发明申请

US20100301761A1 Tail-less LED Control Circuit 有权
标题翻译：无尾LED控制电路
公开(公告)号：US20100301761A1
公开(公告)日：2010-12-02
申请号：US12787599
申请日：2010-05-26
申请人： Chiawei Liao , Jing-Meng Liu , Leng-Nien Hsiu
发明人： Chiawei Liao , Jing-Meng Liu , Leng-Nien Hsiu
IPC分类号： H05B37/02
CPC分类号： H05B33/0818 , Y02B20/346
摘要： The present invention discloses a tail-less LED control circuit, which includes: a power supply stage having an output terminal which provides electrical power to an LED circuit; an output capacitor coupled to the output terminal; an LED driver circuit coupled to the power supply stage for controlling the power supply stage to provide the electrical power to the LED circuit, the LED driver circuit receiving a PWM dimming signal for adjusting brightness of the LED circuit; and a MOSFET switch coupled to the output capacitor in series, the MOSFET switch switching synchronously with the PWM dimming signal to alleviate LED afterglow, wherein the MOSFET switch includes a body diode having an anode-cathode direction against the discharge direction of the output capacitor.
摘要翻译：本发明公开了一种无尾LED控制电路，其包括：具有向LED电路提供电力的输出端子的电源级; 耦合到所述输出端子的输出电容器; LED驱动器电路，其耦合到所述电源级，用于控制所述电源级以向所述LED电路提供电力，所述LED驱动器电路接收用于调节所述LED电路的亮度的PWM调光信号; 以及耦合到串联的输出电容器的MOSFET开关，MOSFET开关与PWM调光信号同步地切换以减轻LED余辉，其中MOSFET开关包括具有抵抗输出电容器的放电方向的阳极 - 阴极方向的体二极管。

2. 发明授权

US07518351B2 Switching regulator over voltage reduction circuit and method 有权
标题翻译：开关稳压器过压降电路及方法
公开(公告)号：US07518351B2
公开(公告)日：2009-04-14
申请号：US11131338
申请日：2005-05-18
申请人： Chiawei Liao , Robert C. Dobkin
发明人： Chiawei Liao , Robert C. Dobkin
IPC分类号： G05F1/00
CPC分类号： H02M1/32
摘要： Output voltage overshoot of a switching regulator is controlled by deactivating switching operation when a signal proportional to the output voltage exceeds a variable threshold level, with the threshold level set as a function of regulator output current. In accordance with an embodiment, a difference signal is generated that corresponds to a difference between an output voltage feedback signal and a constant reference voltage. The generated difference signal is combined with a signal proportional to load current to obtain an adapted threshold level. The adapted threshold level is greater than the level of the constant reference voltage. A regulator switch is reset to an off state when the output voltage feedback signal exceeds the adapted threshold level.
摘要翻译：当与输出电压成比例的信号超过可变阈值电平时，通过将阈值电平设置为调节器输出电流的函数来禁用开关操作来控制开关稳压器的输出电压过冲。根据实施例，产生对应于输出电压反馈信号和恒定参考电压之间的差的差分信号。产生的差分信号与与负载电流成比例的信号组合以获得适应的阈值电平。适应的阈值电平大于恒定参考电压的电平。当输出电压反馈信号超过适应的阈值电平时，调节器开关被复位到关闭状态。

3. 发明申请

US20080180386A1 Backlight control circuit capable of distinguishing under current condition 有权
标题翻译：背光控制电路能够在当前条件下进行区分
公开(公告)号：US20080180386A1
公开(公告)日：2008-07-31
申请号：US12008797
申请日：2008-01-14
申请人： Chiawei Liao , Xiaoyong Zhang , Jing-Meng Liu
发明人： Chiawei Liao , Xiaoyong Zhang , Jing-Meng Liu
IPC分类号： G09G3/36
CPC分类号： G09G3/3426
摘要： The present invention discloses a backlight control circuit capable of distinguishing an under current condition, comprising: at least one light emission device path having a voltage node; at least one current source for controlling the current amount on the light emission device path; and at least one under current detection circuit for generating a first control signal according to the voltage at the voltage node, wherein when the first control signal changes its state, the under current detection circuit generates a second control signal to change the voltage on the voltage node if the light emission device path is normally connected.
摘要翻译：本发明公开了一种能够区分欠电流状态的背光控制电路，包括：具有电压节点的至少一个发光器件路径; 至少一个用于控制发光装置路径上的电流量的电流源; 以及至少一个欠电流检测电路，用于根据电压节点处的电压产生第一控制信号，其中当第一控制信号改变其状态时，欠电流检测电路产生第二控制信号以改变电压上的电压节点，如果发光设备路径正常连接。

4. 发明申请

US20150257228A1 Backlight Control Circuit with Flexible Configuration 审中-公开
标题翻译：具有灵活配置的背光控制电路
公开(公告)号：US20150257228A1
公开(公告)日：2015-09-10
申请号：US14718045
申请日：2015-05-20
申请人： Chiawei Liao , Jing-Meng Liu
发明人： Chiawei Liao , Jing-Meng Liu
IPC分类号： H05B33/08
CPC分类号： H05B33/0845 , G09G3/3406 , G09G2330/04 , H05B33/0812 , H05B33/0827 , H05B33/089 , Y02B20/345
摘要： The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
摘要翻译：本发明公开了一种具有柔性结构的背光控制电路，包括：发光器件路径; 用于控制发光器件路径上的电流量的电流源，电流源在第一状态下接收相对高的参考电压，并且在第二状态下接收相对低的参考电压; 以及用于控制电流源的电流源控制电路，由此当正常使用发光器件路径时，将电流源设置为第一状态，并且当发光器件路径不正常使用时，电流源被设置为第二状态。

5. 发明授权

US08035606B2 Backlight control circuit with under current detection and start-up control 有权
标题翻译：具有欠电流检测和启动控制的背光控制电路
公开(公告)号：US08035606B2
公开(公告)日：2011-10-11
申请号：US11906477
申请日：2007-10-02
申请人： Chiawei Liao , Jing-Meng Liu
发明人： Chiawei Liao , Jing-Meng Liu
IPC分类号： G09G3/36 , G09G5/00 , H05B37/02 , H05B37/00
CPC分类号： H05B33/089 , G02F1/133603 , G02F2001/133612
摘要： The present invention discloses a backlight control circuit, comprising: a voltage supply circuit for receiving an input voltage and generating an output voltage under control by a control signal; at least one voltage comparison path respectively coupled to at least one light emission device path; a voltage operative amplifier circuit for generating the control signal according to a lowest voltage on the at least one voltage comparison path; and at least one under current detection circuit for detecting whether a corresponding one of the at least one light emission device path is in an under current status, whereby when anyone of the under current detection circuits detects the under current status, it sends an exclusion signal excluding a corresponding one of the at least one voltage comparison path from being an effective input of the voltage operative amplifier.
摘要翻译：本发明公开了一种背光控制电路，包括：电压供给电路，用于接收输入电压，并通过控制信号控制输出电压; 至少一个电压比较路径分别耦合到至少一个发光器件路径; 电压操作放大器电路，用于根据所述至少一个电压比较路径上的最低电压产生所述控制信号; 以及至少一个欠电流检测电路，用于检测所述至少一个发光器件路径中的相应一个发光器件路径是否处于低电流状态，由此当所述欠电流检测电路中的任何一个检测到当前状态时，发送排除信号不包括所述至少一个电压比较路径中的相应一个电压作为所述电压运算放大器的有效输入。

6. 发明授权

US07656142B2 Switching regulator with variable slope compensation 有权
标题翻译：具有可变斜率补偿的开关稳压器
公开(公告)号：US07656142B2
公开(公告)日：2010-02-02
申请号：US11180556
申请日：2005-07-14
申请人： Chiawei Liao
发明人： Chiawei Liao
IPC分类号： G05F1/00
CPC分类号： H02M3/156
摘要： Controlled compensation for a switching regulator is attained by detecting switching duty cycle of the switching regulator, developing a compensation signal having a time duration that is related to the detected switching duty cycle percentage, and generating a duty cycle control signal for the regulator that is dependent in part on the developed compensation signal. The compensation signal has a slope profile and is initiated during each switching cycle at a set point in the cycle that is related to the switching duty cycle percentage,
摘要翻译：通过检测开关调节器的开关占空比，开发具有与检测到的开关占空比百分比相关的持续时间的补偿信号，并产生依赖的调节器的占空比控制信号，来实现开关稳压器的受控补偿部分是开发出的补偿信号。补偿信号具有斜率分布，并且在与开关占空比百分比相关的周期中的设定点的每个开关周期期间启动，

7. 发明申请

US20080180387A1 Backlight control circuit with flexible configuration 有权
标题翻译：背光控制电路配置灵活
公开(公告)号：US20080180387A1
公开(公告)日：2008-07-31
申请号：US12008798
申请日：2008-01-14
申请人： Chiawei Liao , Jing-Meng Liu
发明人： Chiawei Liao , Jing-Meng Liu
IPC分类号： G09G3/36
CPC分类号： H05B33/0845 , G09G3/3406 , G09G2330/04 , H05B33/0812 , H05B33/0827 , H05B33/089 , Y02B20/345
摘要： The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
摘要翻译：本发明公开了一种具有柔性配置的背光控制电路，包括：发光器件路径; 用于控制发光器件路径上的电流量的电流源，电流源在第一状态下接收相对高的参考电压，并且在第二状态下接收相对低的参考电压; 以及用于控制电流源的电流源控制电路，由此当正常使用发光器件路径时，将电流源设置为第一状态，并且当发光器件路径不正常使用时，电流源被设置为第二状态。

8. 发明授权

US07388444B2 Switching regulator duty cycle control in a fixed frequency operation 有权
标题翻译：在固定频率运行中切换调节器占空比控制
公开(公告)号：US07388444B2
公开(公告)日：2008-06-17
申请号：US11242095
申请日：2005-10-03
申请人： Chiawei Liao
发明人： Chiawei Liao
IPC分类号： H03K3/02 , G05F1/00
CPC分类号： H03K7/08 , H02M3/156
摘要： A clock oscillator system for use in providing the switching regulator duty cycle control in a fixed frequency (no cycle skipping) operation is provided. In one embodiment, the circuit according to the invention uses an analog feedback loop to extend the switch ON time of the clock cycle by controlling the oscillator charging current and, thereby, increase the duty cycle. Preferably, this circuit can achieve very high switching duty cycle and/or very low switching duty cycle in a PWM switching regulator operated in very low drop-out operation when very high duty cycle is required or in other conditions when very low duty cycle is required.
摘要翻译：提供了一种用于提供固定频率（无循环跳跃）操作的开关调节器占空比控制的时钟振荡器系统。在一个实施例中，根据本发明的电路使用模拟反馈回路来通过控制振荡器充电电流来延长时钟周期的接通时间，从而增加占空比。优选地，该电路可以实现非常高的开关占空比和/或非常低的开关占空比，该PWM开关调节器在非常低的占空比需要非常低的占空比时或在需要非常低的占空比时在其它条件下以极低的输出操作。

9. 发明授权

US07378826B2 Methods and circuits for output over-voltage reduction in switching regulators 有权
标题翻译：开关稳压器输出过压降低的方法和电路
公开(公告)号：US07378826B2
公开(公告)日：2008-05-27
申请号：US11326731
申请日：2006-01-05
申请人： Chiawei Liao
发明人： Chiawei Liao
IPC分类号： G05F1/571
CPC分类号： H02M1/32 , H02M2001/0035 , Y02B70/16
摘要： Switching regulator Burst Mode control circuitry is provided for limiting voltage overshoot at the output of a switching regulator operating in power saving Burst Mode. The Burst Mode control circuitry may include regulator load current sensing circuitry which may be operative to put and maintain the regulator in the SLEEP state when the load current amplitude is below a threshold. The control circuitry may also include gated over-voltage comparator circuitry operative to reduce regulator output overshoot and to eliminate erroneous deactivation of the regulator switch circuitry when the regulator is not operating in Burst Mode. The gated over-voltage circuitry may include a one-shot timer circuit.
摘要翻译：开关稳压器突发模式控制电路用于限制在省电突发模式下工作的开关稳压器输出端的电压过冲。突发模式控制电路可以包括调节器负载电流感测电路，其可以在负载电流幅度低于阈值时将调节器置于和保持在休眠状态。控制电路还可以包括门控过电压比较器电路，其可操作以减小调节器输出过冲，并且当调节器不以突发模式操作时消除调节器开关电路的错误去激活。门控过电压电路可以包括单稳定时器电路。

10. 发明授权

US09072137B2 Backlight control circuit with flexible configuration 有权
标题翻译：背光控制电路配置灵活
公开(公告)号：US09072137B2
公开(公告)日：2015-06-30
申请号：US12008798
申请日：2008-01-14
申请人： Chiawei Liao , Jing-Meng Liu
发明人： Chiawei Liao , Jing-Meng Liu
IPC分类号： G09G3/36 , H05B33/08 , G09G3/34
CPC分类号： H05B33/0845 , G09G3/3406 , G09G2330/04 , H05B33/0812 , H05B33/0827 , H05B33/089 , Y02B20/345
摘要： The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
摘要翻译：本发明公开了一种具有柔性配置的背光控制电路，包括：发光器件路径; 用于控制发光器件路径上的电流量的电流源，电流源在第一状态下接收相对高的参考电压，并且在第二状态下接收相对低的参考电压; 以及用于控制电流源的电流源控制电路，由此当正常使用发光器件路径时，将电流源设置为第一状态，并且当发光器件路径不正常使用时，电流源被设置为第二状态。

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