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公开(公告)号：US20050046402A1
公开(公告)日：2005-03-03
申请号：US10922767
申请日：2004-08-19
CPC分类号： G09G3/22 , G09G2330/02
摘要： A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second filament terminal. The boosting coil is provided in a current path to generate an induced voltage in accordance with a change in current flowing therein. The input terminal receives a DC voltage to be applied to one terminal of the boosting coil. The switching transistor is provided between the other terminal of the boosting coil and a ground line. The PWM control circuit periodically turns on/off the switching transistor. The boosting circuit generates a boosted voltage on the basis of an induced voltage generated at the other terminal of the boosting coil when the switching transistor is switched from ON to OFF. The first terminal is connected to the node between the other terminal of the boosting coil and the switching transistor. A DC voltage lower than the induced voltage generated at the other terminal of the boosting coil is applied to the second terminal.
摘要翻译： 用于真空荧光显示器的电源电路包括升压线圈，输入端子，开关晶体管，PWM控制电路，升压电路，第一灯丝端子和第二灯丝端子。 升压线圈设置在电流路径中，以根据其中流过的电流的变化产生感应电压。 输入端子接收要施加到升压线圈的一个端子的直流电压。 开关晶体管设置在升压线圈的另一端子与接地线之间。 PWM控制电路周期性地接通/关断开关晶体管。 升压电路基于在将开关晶体管从接通切换到断开时在升压线圈的另一端产生的感应电压而产生升压电压。 第一端子连接到升压线圈的另一端子与开关晶体管之间的节点。 低于在升压线圈的另一端产生的感应电压的直流电压被施加到第二端子。
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公开(公告)号：US07088080B2
公开(公告)日：2006-08-08
申请号：US10922767
申请日：2004-08-19
IPC分类号： G05F1/10
CPC分类号： G09G3/22 , G09G2330/02
摘要： A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second filament terminal. The boosting coil is provided in a current path to generate an induced voltage in accordance with a change in current flowing therein. The input terminal receives a DC voltage to be applied to one terminal of the boosting coil. The switching transistor is provided between the other terminal of the boosting coil and a ground line. The PWM control circuit periodically turns on/off the switching transistor. The boosting circuit generates a boosted voltage on the basis of an induced voltage generated at the other terminal of the boosting coil when the switching transistor is switched from ON to OFF. The first terminal is connected to the node between the other terminal of the boosting coil and the switching transistor. A DC voltage lower than the induced voltage generated at the other terminal of the boosting coil is applied to the second terminal.
摘要翻译： 用于真空荧光显示器的电源电路包括升压线圈，输入端子，开关晶体管，PWM控制电路，升压电路，第一灯丝端子和第二灯丝端子。 升压线圈设置在电流路径中，以根据其中流过的电流的变化产生感应电压。 输入端子接收要施加到升压线圈的一个端子的直流电压。 开关晶体管设置在升压线圈的另一端子与接地线之间。 PWM控制电路周期性地接通/关断开关晶体管。 升压电路基于在将开关晶体管从接通切换到断开时在升压线圈的另一端产生的感应电压而产生升压电压。 第一端子连接到升压线圈的另一端子与开关晶体管之间的节点。 低于在升压线圈的另一端产生的感应电压的直流电压被施加到第二端子。
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