Solutions for cutting effect of medical plasma electric knife

Customers received the medical plasma knife samples, the initial test of the effect, then buy pork to test, did not expect to cut only one or two under the die, the type of the knife can not be recognized, power can not output, a moment dumbfounded. In view of the customer to go to India to exhibit, so the same day after the communication sent back, Saturday received the machine.

Colleague received the machine, the first to confirm the identification of the part of the circuit, quickly found that the TL556 of the head when the chip burned, after the replacement is good, but why will burn, and so on after the main circuit repaired again, after analysis of the main circuit why output power, after the inspection found that the voltage sampling resistance burned out, Then found that the voltage sampling of the original side of the resistor is too close to the short-circuit together, replace the resistor, the original side of the resistance of the pin pull, the output power is normal.

After the machine is good, we use the customer sent the knife test, quickly TC556 when the base chip on the burning, and also found that the knife head into the water when there is a strong spark, at the same time in the TC556 circuit also generated sparks, the water is a strong spark with the TC556 burn when the spark has relevance, careful analysis, Realize that the electric knife nearly 2 meters of the transfer wiring caused problems, 2 meters long connection line, equivalent to the transformer, in the head identification circuit to generate a high pressure, the TC556 burned, know this principle, so in the TC556 access part, added two protection diodes, once again the head into the water test, no problem, But when the knife head out of the water, TC556 again burned, this shows that this protection circuit has been invalidated, the need to thoroughly improve the circuit design, it can only put the problem first put.

In check TC556 problem, found our machine, the knife head into the water, because the salt resistance is very low, resulting in water has a very strong spark, easy to burn the knife head, quickly burned down 2 bits of the head, the problem is unacceptable, compared to the best original machine, their head into the water there is no spark, feel very mild, This shows that the circuit is added to the current limit circuit, and then began to optimize the program design, as far as possible to shorten the detection time, to achieve current limit protection. Because the knife head only 5, and then burned 2, and then burned no knife head used, so think of a way, colleagues made two simple knife head, can be reused, mainly used to detect the water spark problem, to achieve similar effects with imports.

From Saturday 4 o'clock in the afternoon has been tossing to night, or even all night, all kinds of limit algorithm to do, or not much improvement, and these algorithms even if there is a certain improvement, stability is not good, because the customer is very urgent, so all night, night woke up and continue to improve, this time there is a sense of powerlessness, and even doubt their ability , I hope to have an expert can guide twos. Until the next morning, the current limit problem was not resolved, and another colleague worked late into the night, and he was responsible for improving the current limit protection of the adjustable power supply.

To the next morning, because the realization of the software limit flow has reached the limit, see no hope, so began to check the circuit of the Gatorade machine, compared to our circuit, I hope to find some differences, in fact, our circuit with it is a big difference, so I follow the design improvement of Jia Le, found that the water effect greatly improved, Basically achieves the similar effect with it, is really steady, the hardware realization current limit effect is much higher than the software realization effect.

This happened on the day of mountain bamboo, because the typhoon, even if it is done, express delivery is not enough to meet the customer's time, because found the problem, so also finally put down the heart, peace of mind over the next weekend.

So conscientious colleague, let me very admire, no wonder his technology can so good, can do so many projects, no one's success is casual.

Solutions for cutting effect of medical plasma electric knife