[introduction]The article will introduce a basis to measure gotten switch weaveform in an article, use linear approximation will calculate the method of power loss.

The key of the article wants a place

? The weaveform that OK and online sex measures to place inside approximate and effective limits undertakes breaking up, use formula of give typical examples to have the approximate consideration of loss.
? The general power loss when MOSFET switch works is switch loss is mixed guide a loss the sum.

The article will introduce a basis to measure gotten switch weaveform in an article, use linear approximation will calculate the method of power loss.

The measurement technique of switch weaveform

Break up approximately through undee linear will calculate the method of loss
Get give a demonstration of undee computation power loss according to measuring
Give typical examples of all sorts of undee switch loss calculation
Of all sorts of weaveform guide a loss calculation give typical examples

SiC MOSFET is broken up approximately through undee linear will calculate the method of loss

The weaveform that measures to place through be inside linear and similar effective limits undertakes breaking up, can calculate a power loss.

Guide the switch loss that connect and involves interval

Above all, computation debuts and close the power loss Pton that uses up inside time and Ptoff. Weaveform uses a figure 1 medium give typical examples is undee. Power loss uses a list 1 medium similar formula will calculate. Because computational formula is met because of undee appearance differ somewhat, because this asks a choice,be close to measures undeely similar formula.

In the graph in the undee give typical examples of 1, the weaveform when debutting is broken up to be two parts, before half part (Ton1) use watch 1 medium exemple 2. Additional, use formulary ID1? 0 as the condition. Second half part (Ton2) use a 3 medium formulary VDS2? 0.

In the graph 1 in, the meeting because of MOSFET guide electrify block produces voltage VDS2(on) with ID, but if this voltage is far the High voltage under VDS, can inspect its for 0.

Graph 1. Give typical examples of switch loss weaveform

The place on put together is narrated, can use the formula below (1) will be calculated approximately the power loss when debutting.

Same, also divide the weaveform when closing for two parts, before half part (Toff1) use watch a 1 medium formulary VDS1 of 1? 0, is second half part used (Toff2) exemple 8 medium formulary ID2? 0. In the graph 1 in, as a result of aforementioned reason, can produce voltage VDS1(off) , but if this voltage is far the High voltage under VDS, press its ” 0 ” processing. Such, can use the formula below (2) will be calculated approximately the power loss when closing.

Guide the power loss during connecting

Next, we will calculate the power loss that guides during connecting, be used up. Graph 2 it is to use computation to guide the undee give typical examples that knows loss. Because be in,TON interval MOSFET is to guide those who connect, because this VDS is MOSFET,guide the product of electrify block and ID. About guide the value of electrify block, consult please technical standards book. Need from the watch 2 in the case that chooses to be close to this weaveform appearance uses his similar formula will calculate power loss.

Graph 2. Guide a loss weaveform give typical examples

In this give typical examples, we use a list 2 medium exemple 1. MOSFET guides during connecting guide connect loss to be able to use the formula below (3) will calculate.

The power loss when MOSFET closes is in graph 2 in be located in TOFF interval, the ID when closing as a result of MOSFET is enough small, treat power loss accordingly 0.

Total loss

Like formula (4) be shown, the switch loss that the computation before the general power loss when MOSFET switch works is this gives and guide a loss the sum.

Those who need an attention is, watch 1 with the watch every 2 medium example have ” refer to an appendix ” annotate, there is the detailed computation give typical examples of every example in the appendix. Each computation give typical examples will be in follow-up ” give typical examples of all sorts of undee switch loss calculation ” and ” of all sorts of weaveform guide a loss calculation give typical examples ” in appear.

 

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