Experimental analysis on precise calorimetric power loss measurement using two chambers

In this paper, a low cost and simple structure power measuring system for a high efficiency power converter is proposed. The Calorimetric Power Loss Measurement (CPLM) uses the heat quantity which is generated by the power converter to measure losses. The proposed system is a low cost and simple structure without complex control circuits, which will increase the cost of the CPLM system. The measurement of the power consumption can be calculated by the increased temperature. The features of the proposed method are that the power consumption of the power converter is measured from the transient state of the rise in temperature. As a result, the measurement time of the power loss of the power converter is reduced by 86.1% in comparison with a conventional method. In addition, all of the maximum errors of the measuring power consumption are within 10%. Moreover, another method that can reduce the measurement time is discussed. In particular, the temperature in the container B is controlled to follow in the temperature in the container A for the transient state of the rise in temperature. As a consequence, the measurement time of the power loss of the power converter is reduced by 87.5% in comparison with a conventional method.