In the production and application of electronic products, we must first consider the two factors of "error" and "standard". In terms of “errorâ€, the most common error in the production process is the discrete error of the component itself, which determines the “design redundancy†in the design. The so-called "error" also needs to consider the error of the application end, that is, the error of the lamp bead.
We can often hear "our drive is due to the use of XXX's switching circuit structure, so that the current stability is 1%, there are various temperature compensation to stabilize this current value" and so on. Regardless of whether the 1% current stability is an excellent indicator, let us assume that the current driven by this LED is very stable. If the LED lighting product using this driver is also stable, the parameters of the lamp bead are very stable.
For the case of the lamp on the market, I have a specification confirmed by a well-known company, in which the forward working voltage is 3.0V-3.6V, and if the midpoint value is 3.3V, the relative error is ±9%. As a matching drive, which value is the best for current stability? There is an interesting phenomenon here: the stronger the current stability advantage that the company promotes, the more it can reflect the inconsistency of the LED lamp beads , thus affecting the consistency of the whole lamp. In simple terms, the better the current stability of the LED driver (the smaller the LED driver error), the worse the uniformity of the whole lamp (the greater the error of the LED lamp).
Besides, the standard covers a wide range. For example, the standard of components involves the versatility of components produced by different manufacturers. The other is the standardization of production processes that are often neglected. In the last issue, the suppression of electromagnetic interference was a problem. typical example. For single products, electromagnetic interference suppression can be achieved. The problem is that each individual LED driver product has a different solution. This dilemma has caused electromagnetic interference to some switch-driven power supplies, and there is currently no solution that can be applied to mass production. We can conclude that there are many LED drivers on the market that are not qualified for the sampling of electromagnetic interference detection items in GB, CE, and UL. This type of LED product can pass the inspection when it is sent, and the user cannot have good electromagnetic interference suppression during use. In addition, the uncontrollable electromagnetic interference, although the electromagnetic interference of the LED whole lamp is derived from the drive, but the place with the strongest electromagnetic interference is not only the drive but also the light plate part. This indicates that the user of the LED full lamp is exposed to the strongest electromagnetic radiation. Today's people pay so much attention to health and green. How can we explain the electromagnetic radiation brought by LED driving to the public as a practitioner?
The design of LED driver and supporting electronic products should be as follows: 1. The design should serve the “core technical requirements of the matched productsâ€; 2. The design of the products should consider both errors and standards. These two seemingly unremarkable design principles can create a truly useful driver for LED lighting.
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