First of all, let's explain the stopping method of -△V. Because NiMH battery charging is relatively full, not absolutely, it is always very complicated to stop charging NiMH batteries.
NiMH battery chargers are designed to stop charging in 3 ways on the market
1, time control (timed power off)
2, Constant voltage (charge to a set voltage)
3, -△V (intelligent algorithm, negative pressure judgment stop, why is called negative pressure will be explained below)
The best of the above three ways is -△V, this algorithm is through the IC control chip to detect the NiMH battery in the charging process to produce a drop in voltage phenomenon. Hereinafter referred to as (negative pressure)
Usually the following graph is used as the standard -△V graph (the blue line is the real-time battery voltage)
(Note: This graph is derived from the early days when only Japan mastered this technology, because the battery technology and chargers at that time were not as advanced as they are now, so a regular and continuous negative pressure monitoring and continuous charging process was required, which eventually produced a significant drop in the voltage curve trend in the graph)
However, the actual situation - △v negative voltage phenomenon is not the case, in the entire charging process of NiMH batteries are negative pressure phenomenon, when the battery power is less, the negative pressure generated by the value of relatively large, continuous charging of NiMH batteries, with more power, the value of negative pressure will be smaller and smaller. According to this characteristic, when designing the NiMH battery charger, we only need to set the charger to capture only a certain range of negative pressure data as the basis for the charger to stop charging, so that safe charging can be achieved.
The controversial RYD225's charger is based on this algorithm to judge stop charging. Strictly speaking, the RYD225 is a very accurate charger in terms of stopping charging, and it is very thorough in stopping charging. (High temperature is a big killer of NiMH battery life). But the detection curve will lead to some with some knowledge, but no more professional equipment to do the test of this part of the more professional players question.
The graph below is a screenshot of a report of our equipment testing NiMH battery chargers to stop
This is the graph
Here is the detailed data of the voltage of the charger when it stops charging
Please note the above graph, there are a total of 6 copies of the data above, the charger in stopping charging, the continuous detection of the variable is 0.001V appears 2 to 3 times when the charger stops charging. And this kind of millivolt level data, there is no curve is to mention out. If there is any doubt, it is recommended that the other party to retrieve detailed data for comparison. The NiMH battery charger that captures this precision is rarely available on the market, and the charger produced by our company has a very high precision. There is no doubt whether the mechanism of -△V stop charging, support the detection of any institution.
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