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UPS电源变压器出现偏磁如何处理,日常生活中应该怎样防范?

UPS电源变压器出现偏磁如何处理,日常生活中应该怎样防范?

作者:admin    来源:未知   发布时间:2018-08-23 20:48    浏览量:

  众所周知,UPS不间断电源作为保护的重要仪器,数据中心系统本身往往会有一些故障,它无法为我们的负载提供保护。UPS电源变压器出现偏磁如何处理,日常生活中应该怎样防范?

如果UPS电源采用变压器结构,则UPS电源的前半部分是一个周期内变压器的正向励磁,下半部分是变压器的反向励磁。在正常操作期间,正向和反向磁通峰值几乎相等。并且不要进入BH曲线的饱和区域,然后称变压器处于平衡状态。

UPS电源变压器防范偏磁的方法

  

 
  如果由于某种原因,UPS电源为正半周或负半周且变压器初级电压值不相等,或者电源开关装置的导通时间不相等,则UPS电源通量率或变化率可能会改变,或者流量可能会上升。或者下降时间不一致等,无论哪个导致变压器偏置。
  
  如上所述,变压器的偏置可以在全桥和推挽逆变器电路中发生,而UPS电源半桥逆变器电路具有强的抗偏移能力并且通常不产生偏置。现象。 UPS功率半桥逆变器电路具有这样的特性的原因是施加到变压器初级的电压取决于串联电容器的中点电位,其由分压电容器的分压确定,并且电压分布取决于各自的负载(即导通脉冲的宽度),具有大的导通脉冲宽度的电容器上的电压较低,而另一电容器上的电压较高。也就是说,UPS功率分配器电容器的中点电位具有浮动特性,因为UPS电源可以保持等于两个不等半周期中的伏秒数。

  If the UPS power supply adopts a transformer structure, the first half of the UPS power supply is forward excitation of the transformer in one cycle, and the reverse excitation of the transformer in the second half. The forward and reverse magnetic flux peaks are almost equal during normal operation. And do not enter the saturation region of the BH curve, then the transformer is said to be in equilibrium.
  
  If, for some reason, the UPS power supply is positive or negative for half a week and the voltage value of the transformer primary is not equal, or the on-time of the power switching device is not equal, the UPS power supply flux rate or rate of change may change, or the flux may rise. Or the fall time is inconsistent, etc., whichever causes the transformer to be biased.
  
  As mentioned above, the biasing of the transformer may occur in both full-bridge and push-pull inverter circuits, while the UPS power supply half-bridge inverter circuit has strong anti-offset capability and generally does not generate biasing. phenomenon. The reason why the UPS power half-bridge inverter circuit has such a characteristic is that the voltage applied to the primary of the transformer depends on the midpoint potential of the series capacitor, which is determined by the voltage division of the voltage dividing capacitor, and the voltage distribution depends on the respective The load (ie, the width of the turn-on pulse), the voltage on the capacitor with the large on-pulse width is lower, and the voltage on the other capacitor is higher. That is to say, the midpoint potential of the UPS power divider capacitor has a floating characteristic, because the UPS power supply can remain equal to the number of volt-seconds in two unequal half cycles.

UPS电源变压器出现偏磁解决措施



  1、UPS电源维修时需要明白这个故障的原因是过流保护失效。当逆变器输出发生过电流时,过流保护电路不起作用;
  
  2、脉宽调制(PWM)组件故障,输出的两路互补波形不对称,一个导通时间长,而另一个导通时间短,使两臂工作不平衡,甚至两臂同时导通,造成两管损坏;
  
  3、功率管参数相差较大,此时即使输入对称波形,输出也会不对称,该波形经输出变压器,造成偏磁,即磁通不平衡,UPS电源维修时就会明白积累下去导致变压器饱和而电流骤增,烧坏功率管,而一只烧坏,另一只也随之烧坏。

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