MDX61B0015-5A3-4-00
MDX61B0015-5A3-4-00
为什么不能串联使用电子负载?
测试最大电流为20V且功率为100W的固定输出DC电源时,必须使用相同或更高的电压、电流和功率。由电源吸收的电子负载电源。由于电源是具有20V恒定电压输出的恒压CV电源,因此在测试期间,电子负载必须在恒流CC模式下运行,并将其电流从0A调节至0A。
当然,对于另一种DC-DC电源,电子负载必须在恒定电压CV模式下运行,在某些情况下,电子负载必须在CR或CP模式下运行。
通常,建议在被测直流电源容量较大而电子负载容量不足时,串联或并联连接多个电子负载,以提高电子负载的性能。如果电流不足,则可以并联多个电子负载。但是,如果电压不足,是否可以串联多个电子负载?这不仅阻止您执行以下操作,而且还达到了测试的目的。可能的结果是电子负载将被损坏。
然后,我们就能大概分析出这是为什么?
当然,您需要提前了解电子负载的工作方式。电子负载控制和调节连接到输入的FET功率场效应管RDS。似乎连接了多个电子负载也没有出现很大的问题。
如果将两个电子负载以CC模式菊花链连接,并将它们设置为与图2所示的电流值完全相同的电流值,则它们都将设置为10.00A。但是,实际上,当一个负载实际为9.99A而另一个为10.01A时,电子负载不能为10.00A。
这样,电子负载2不能达到设定值,从而FET的RDS连续降低到0(短路),整个电压被施加到电子负载1,并且过电压被损坏。为什么不能串联使用电子负载?有人建议两个电子负载分别在恒流CC模式和恒压CV模式下运行,但这似乎允许设置电压和电流点的运行状态。
但是,如何将这两个电子负载输入到已配置的CC和CV工作点中?
1、假设您首先设置了一个电子负载,然后将其连接到被测电源。由于在CC模式下设置的电子负载不包含任何电流,因此FET的RDS设置为0(短路)。由于该模式的电子负载中没有电压,因此FET的RDS设置为+∞(开路)。连接电源后,在CV模式下,电源的整个100V电压都会施加到负载上,这可能会造成损坏。
2、有一种折衷的方法。通过调节直流电源的浪涌电压的斜率,被测电源会缓慢增加输出电压(被测电源需要此功能),输入将电子负载设置为串联连接的工作点,但是,如果在工作过程中发生异常并触发了电子负载的保护,则两个电子负载将短路或中断,从而使100V电源过载,如果将设备连接到电子负载的输入端子,将损坏电子负载。
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