The invention provides a DC bus capacitor group health monitoring circuit, including: capacitors, capacitors connected with the anode and cathode busbar busbar, the capacitor group includes a plurality of sub series capacitors; equalizing resistor group, equalizing resistance group is connected with the anode and cathode busbar busbar, equalizing resistor group includes a plurality of series the pressure resistance group; monitoring module, monitoring module and bus series cathode, anode, sub bus connection capacitor group. The invention has the following advantages: the capacitor performance degradation capacity after attenuation, the leakage current increases, will cause the characteristics of capacitance series series voltage deviation, voltage monitoring by serial bus capacitor group, timely detection of problems due to deterioration of the partial capacitance capacitor group performance, and through the alarm information to prompt the user to check the capacitor, to avoid the part of a severe recession caused by the capacitance performance of bus voltage in the uneven distribution of series capacitor, capacitor triggered local overpressure hazards, improve system security and reliability.
【技术实现步骤摘要】
直流母线电容组健康监测电路
本专利技术涉及监测电路,具体涉及一种直流母线电容组健康监测电路。
技术介绍
直流母线电容是变频器、伺服驱动器、电焊机等功率设备的关键组件之一。通常情况下,受电解电容耐压限制,为了满足380V交流输入条件下直流母线电压超过500V的工作电压条件,需要将电解电容串联,以获得更高的耐压值。实际工作过程中,由于电解电容个体差异,通常很难保证串联的两个电解电容均匀分摊承受母线电压,因此通常会设置均压电阻,使上下两个串联电容尽量承受相同的电压,防止由于分压不均造成一侧电容工作电压超过耐压值,引发危险。尽管均压电阻的存在可以在一定程度上保证上下电容两端的电压尽量接近,但由于电解电容的制造差异,长时间工作后由于电容组中各电容单体不一致的性能衰退,均压效果会逐渐变差,存在使某侧电容工作电压超过允许安全电压的风险。
技术实现思路
针对现有技术中的缺陷,本专利技术目的在于提供一种提高系统安全性和可靠性的直流母线电容组健康监测电路。为解决上述技术问题,本专利技术提供一种直流母线电容组健康监测电路,包括:电容组,所述电容组与母线正极和母线负极连接,所述电容组包括多个串联的子电容组;均压电阻组,所述均压电阻组与所述母线正极和所述母线负极连接,所述均压电阻组包括多个串联的子均压电阻组;所述均压电阻组与所述电容组并联,所述子均压电阻组与所述子电容组并联;监测模块,所述监测模块与所述母线正极、所述母线负极、所述子电容组的串联点连接。优选地,所述电容组包括串联的多个子电容组;其中所述电容组两端分别与母线正极和母线负极相连;所述子电容组由单个电容或多个电容并联而成。优选 ...
【技术保护点】
一种直流母线电容组健康监测电路,其特征在于,包括:电容组,所述电容组与母线正极和母线负极连接,所述电容组包括多个串联的子电容组;均压电阻组,所述均压电阻组与所述母线正极和所述母线负极连接,所述均压电阻组包括多个串联的子均压电阻组;所述均压电阻组与所述电容组并联,所述子均压电阻组与所述子电容组并联;监测模块,所述监测模块与所述母线正极、所述母线负极、所述子电容组的串联点及所述子均压电阻组的串联点连接。
【技术特征摘要】
1.一种直流母线电容组健康监测电路,其特征在于,包括:电容组,所述电容组与母线正极和母线负极连接,所述电容组包括多个串联的子电容组;均压电阻组,所述均压电阻组与所述母线正极和所述母线负极连接,所述均压电阻组包括多个串联的子均压电阻组;所述均压电阻组与所述电容组并联,所述子均压电阻组与所述子电容组并联;监测模块,所述监测模块与所述母线正极、所述母线负极、所述子电容组的串联点及所述子均压电阻组的串联点连接。2.根据权利要求1所述的直流母线电容组健康监测电路,其特征在于,所述电容组包括串联的多个子电容组;其中所述电容组两端分别与母线正极和母线负极相连;所...
【专利技术属性】
技术研发人员:徐骋,高彬,
申请(专利权)人:英孚康浙江工业技术有限公司,
类型:发明
国别省市:浙江,33
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。