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Comparison common mode noise reducibility of full-bridge and half-bridge converters for bidirectional DC motor drive
Author(s)
Srisawang, A.
Thanasana, S.
Aunchaleevarapan, K.
Prempraneerach, Y.
Date Issued
December 1, 2005
Type
Conference Paper
Abstract
This paper is purposed to compare a common mode noise reduction ability of full-bridge and half-bridge converters for bidirectional dc motor drive. This comparison will help the driver design engineer to correctly select the dc motor drive for specific application which the noise factor is concerned. With regard to an electromagnetic interference (EMI) causing in general dc-dc converters is necessary to determine the essential parameters in the circuit such as the parasitic capacitances of heat sink, switching noise, and unbalanced characteristic of a circuit and so on. The general half-bridge converter for bidirectional dc motor drive usually uses unbalanced circuit topology between sending and returning power line. The unbalanced half-bridge converter will generate the common mode current to flow through the parasitic capacitance of heat sink to a frame ground or chassis. This paper is also purposed to illustrate the common mode noise reduction ability of a full-bridge converter for bidirectional dc motor drive. The most significant specific characteristic of full-bridge converter is the simultaneous switching on and off of the two switching devices (Q1 and Q2 or Q3 and Q 4) which are performed in bipolar switching mode operation. When the two switching devices are simultaneously operated on and off which has load or dc motor to be placed between their switch action, such simultaneous switched performance is illustrated the characteristic of active noise cancellation at the dc motor terminals. The four switching devices are used to manage the switching performance which is a very good strategy for controlling the output power and it also achieves the ability of active noise cancellation at the load terminals. In addition, due to the full-bridge converter circuit has the symmetrical scheme when the four parasitic capacitances of the heat sink are connected to the frame ground or chassis will provide more circuit balance. The circuit balance and active noise cancellation characteristics of the bipolar switching mode of a full-bridge converter will show the ability to greatly reduce the common mode noise is confirmed by experimental results. © 2005 SICE.
Citation
Proceedings of the SICE Annual Conference, 1342-1346, 2005