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    • 4. 发明公开
    • Dead-time minimization in PWM driven power converters
    • PWM驱动电源转换器中的死区时间最小化
    • EP2846447A2
    • 2015-03-11
    • EP14182937.4
    • 2014-08-29
    • Control Techniques Ltd
    • Webster, Antony JohnHart, Simon David
    • H02M1/38H02M7/5395
    • G01R23/00H02M1/38H02M7/5395H02M2001/0009H02M2001/385
    • A method is provided of determining a time interval between switching events for a switching device in a power converter, the switching device being for coupling a direct current (DC) source to provide an alternating current (AC) output at a particular switching frequency. The method comprises selecting an initial length of a time interval between a first switching event and a second, subsequent switching event for the switching device and obtaining a current measurement value for the switching device when the time interval between the first switching event and the second, subsequent switching event takes said initial length. The method further comprises changing the length of the time interval between the first switching event and the second, subsequent switching event and obtaining a current measurement value for the switching device when the length of the time interval is changed. The current measurement values which have been obtained are used to detect generation of a current in the switching device. It is then determined, from the change made to the length of the time interval and the current measurement values obtained, a length (t g ) of the time interval at which said generation of a current in the switching device occurs.
    • 提供一种确定功率转换器中的开关装置的开关事件之间的时间间隔的方法,所述开关装置用于耦合直流(DC)源以提供在特定开关频率下的交流(AC)输出。 该方法包括:当第一切换事件与第二切换事件之间的时间间隔时,为切换设备选择第一切换事件与第二切换事件之间的时间间隔的初始长度,并获得切换设备的当前测量值; 随后的切换事件取所述初始长度。 该方法还包括:当时间间隔的长度改变时,改变第一切换事件与第二切换事件之间的时间间隔的长度,并且获得切换设备的当前测量值。 已经获得的电流测量值被用于检测开关装置中的电流的产生。 然后根据对时间间隔的长度的变化和所获得的电流测量值,确定在开关装置中产生电流的时间间隔的长度(tg)。
    • 6. 发明公开
    • POWER CONVERSION CIRCUIT
    • STROMWANDLUNGSKREIS
    • EP2051363A1
    • 2009-04-22
    • EP07792231.8
    • 2007-08-02
    • TOYOTA JIDOSHA KABUSHIKI KAISHA
    • OHTANI, HirokiOKAMURA, Masaki
    • H02M7/48
    • H02M1/38H02M2001/385
    • A desired current is permitted to flow in a coil (14) by controlling switching of switching elements (18, 20) by a PWM controller (60). For a voltage sensor (42), a value of Vo-ΔV, which is a difference between a midpoint voltage Vo of the switching elements (18, 20) and a previously determined threshold voltage ΔV, and a value of Vo-(Vc-ΔV), which is a difference between the midpoint voltage and a value obtained by subtracting the threshold voltage ΔV from a voltage Vc of an upper line, are detected. The detection results obtained from the voltage sensor are inputted to the PWM controller (60) through flip-flop circuits (44, 46) and a dead time compensator (48), and dead time compensation is performed, for instance, to an instruction for PWM control signal generation.
    • 通过PWM控制器(60)控制开关元件(18,20)的切换,允许期望的电流流入线圈(14)。 对于电压传感器(42),作为开关元件(18,20)的中点电压Vo与先前确定的阈值电压V之间的差值的Vo-“V值与Vo-( 检测中点电压与通过从上位线的电压Vc中减去阈值电压V而得到的值之间的差值Vc-“V”。 从电压传感器获得的检测结果通过触发器电路(44,46)和死区补偿器(48)输入到PWM控制器(60),并且执行死区时间补偿,例如, PWM控制信号产生。
    • 10. 发明公开
    • Blanking interval voltage deviation compensator for inverters and converters
    • 用于逆变器和转换器的隔离电压偏差补偿器
    • EP0533403A3
    • 1993-08-25
    • EP92308251.5
    • 1992-09-10
    • OTIS ELEVATOR COMPANY
    • Blasko, Vladimir
    • H02M7/5387
    • H02M7/53875H02M2001/385
    • The invention is used in a voltage conversion bridge for use in converting an AC voltage to a DC voltage or inverting a DC voltage into an AC voltage. In a three-phase bridge having one of three reference phase voltages U A or U B or U c associated with each leg, one of the switches S1, S2 or S3 (or alternatively their complements S1*, S2* or S3*) conducts in the time intervals where the associated voltage U A , U B or U C has a higher (or alternatively, smaller) amplitude than the other two reference voltages, and during these times the blanking interval compensation loss is compensated. According to the invention, (a) a three reference voltages U A , U B , U C are supplied; (b) the maximum of these voltages is detected; (c) the maximum is subtracted from the peak value U TP of a triangle wave used for forming the PWM signal; (d) the difference is added to each of the reference voltages to form a three first augmented reference voltages U A′ , U B′ , U C′ to a blanking interval loss compensator; (e) if the voltage conversion bridge is not saturated and adding a blanking interval deviation voltage compensation signal would not cause saturation, a blanking interval voltage deviation compensation signal is added to the first augmented reference voltages to compensate for voltage deviation caused by a blanking interval, thereby providing second augmented reference signals U A ˝, U B ˝, U C ˝; and (f) the compensated signals are supplied to the PWM section, which in turn supplies PWM signals U SA ˝, U SB ˝, U SC ˝ to a three-phase bridge 5. This method minimizes voltage deviations caused by the use of a blanking interval.