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    • 32. 发明申请
    • SINGLE-STAGE PFC CONVERTER WITH CONSTANT VOLTAGE AND CONSTANT CURRENT
    • 具有恒定电压和恒定电流的单级PFC转换器
    • US20120170330A1
    • 2012-07-05
    • US13182291
    • 2011-07-13
    • Ta-Yung YangJhih-Da HsuYing-Chieh SuLi Lin
    • Ta-Yung YangJhih-Da HsuYing-Chieh SuLi Lin
    • H02M7/04
    • H02M1/4258H02M2001/0006Y02B70/126
    • An exemplary embodiment of a power converter is provided. The power converter includes a transformer, a power device, a switching controller, and a capacitor. The power device is coupled to the transformer for switching the transformer to product output of the power converter. The switching controller receives a feedback signal for generating a switching signal coupled to drive the power device. An input circuit of the switching controller is coupled to the transformer to sample an input signal for generating the feedback signal, and the input signal is correlated to the output of the power converter. The capacitor is coupled to the switching controller to provide frequency compensation for a feedback loop of the power converter. Input of the power converter is without an electrolytic capacitor, and a maximum output current of the power converter is a constant current.
    • 提供了功率转换器的示例性实施例。 功率转换器包括变压器,功率器件,开关控制器和电容器。 功率器件耦合到变压器,用于将变压器切换到功率转换器的产品输出。 开关控制器接收用于产生耦合以驱动功率器件的开关信号的反馈信号。 开关控制器的输入电路耦合到变压器以对输入信号进行采样以产生反馈信号,并且输入信号与功率转换器的输出相关。 电容器耦合到开关控制器以为功率转换器的反馈回路提供频率补偿。 功率转换器的输入没有电解电容器,功率转换器的最大输出电流为恒定电流。
    • 39. 发明授权
    • Switching controller for flyback power converters without input capacitor
    • 用于没有输入电容器的反激式电源转换器的开关控制器
    • US09007786B2
    • 2015-04-14
    • US13348963
    • 2012-01-12
    • Ta-Yung YangLi LinChao-Chih Lin
    • Ta-Yung YangLi LinChao-Chih Lin
    • H02M3/335H02M1/00
    • H02M3/33507H02M2001/0022
    • The present invention proposes a switching controller of a flyback power converter. The switching controller includes a switching circuit, a sample-and-hold circuit, a voltage detection circuit, an oscillation circuit, and a comparator. The voltage detection circuit generates a holding signal when a level of an input voltage of the flyback power converter is lower than a low-threshold. The oscillation circuit limits the maximum frequency of switching signal. The maximum frequency is increased in response to a decrement of a modulation signal. The modulation signal correlated with a level of the input voltage is used to generate a control signal when the level of the input voltage is lower than an ultra-low-threshold. The control signal is enabled to operate the flyback power converter in continuous current mode operation. Therefore, an input capacitor can be eliminated and manufacturing cost is saved.
    • 本发明提出了一种反激式功率转换器的开关控制器。 开关控制器包括开关电路,采样保持电路,电压检测电路,振荡电路和比较器。 当反激式功率转换器的输入电压的电平低于低阈值时,电压检测电路产生保持信号。 振荡电路限制开关信号的最大频率。 响应于调制信号的减少,最大频率增加。 当输入电压的电平低于超低阈值时,与输入电压的电平相关的调制信号用于产生控制信号。 控制信号使能在连续电流模式下操作反激式功率转换器。 因此,可以消除输入电容器并节省制造成本。
    • 40. 发明授权
    • Adaptive slope compensation programmable by input voltage of power converter
    • 功率转换器输入电压可编程的自适应斜率补偿
    • US08934266B2
    • 2015-01-13
    • US13591207
    • 2012-08-21
    • Ta-Yung YangLi LinYue-Hong Tang
    • Ta-Yung YangLi LinYue-Hong Tang
    • H02M3/335
    • H02M3/335H02M2001/0022H02M2001/0025
    • A method for controlling a power converter is provided. The method includes the following steps. A switching signal coupled to switch a transformer for regulating the output of the power converter is generated in accordance with a feedback signal and a ramp signal. The ramp signal is generated in accordance with a switching current signal and a slope compensation signal. The slope compensation signal is generated in response to an input voltage signal. The input voltage signal is generated in response to the level of the input voltage of the power converter. The feedback signal is generated in accordance with the output of the power converter, and the switching current signal is correlated with a switching current of the transformer.
    • 提供一种用于控制功率转换器的方法。 该方法包括以下步骤。 根据反馈信号和斜坡信号产生耦合以切换用于调节功率转换器的输出的变压器的开关信号。 斜坡信号根据开关电流信号和斜率补偿信号产生。 斜坡补偿信号是根据输入电压信号产生的。 响应于功率转换器的输入电压的电平而产生输入电压信号。 反馈信号根据功率转换器的输出产生,开关电流信号与变压器的开关电流相关。