Liu Pingwu grabbed a bottle of Yibao water and drank half of it.

Upon hearing Zhang Hongtao's question, Liu Pingwu quickly put down his water bottle and wiped his mouth.

"Mr. Zhang, everyone, the switching power supply used in our products should be in fixed frequency and variable pulse width mode. The frequency is generally 400~600KHz, or above 1.6MHz..."

Du Gong below couldn't help shouting, "Mr. Liu, do you mean to increase the frequency and switch to a switching frequency of 2MHz?"

"Yes."

"However, switching power supplies with a frequency of 2MHz have only been used in Europe and the United States for a short time. There is not much room for main chip selection, and the requirements for Schottky diodes, preamplifier transistors and MOS tubes are also very high. The total cost of these devices is not low.

."

Yang Gong also nodded in agreement.

"Well, we also had a preliminary discussion on the 2MHz frequency switching power supply last year. The main chip must be from TI, the Schottky diode and the front-stage excitation transistor must be from National Semiconductor, and the MOS tube must be from Fairchild. The total cost is

At least sixty yuan. Compared with our current power supply, it’s about ten yuan more.”

Several engineers whispered to each other again.

"After talking about it, it still doesn't work. I switched back to the 2MHz switching power supply."

"Yes, last year Julianji came to recommend it to us. It was very promising and the parameters were extremely good, but when it came to the price, it was completely blind."

"No, it seems like today is another day of joy."

Zhao Xing and Jiang Lili sat at the back and heard these words clearly.

They didn't understand a word of the technical issues they just discussed. But they could hear the engineer's complaints clearly. They looked at each other and felt extremely anxious.

Why did the harmonious environment that Mr. Liu finally created suddenly turn around? If this continues, how can we get these engineers to accept our recommendations?

I want to help but don’t know where to start. The issues discussed today are all closely related to technology, and they don’t even know how to start.

Sitting there, the two of them were very depressed, and a sense of powerlessness made them restless.

Liu Pingwu stood in front with a smile on his face. After the engineers had finished talking, he said in a calm tone: "Sko has a product specifically for the EU market, UW05-276, this is it."

As he spoke, he pointed to a picture on the projection screen.

Zhang Hongtao and the engineers could tell at a glance that it was indeed a Scoo product. Its appearance design and the logo on it were all so familiar.

"This product uses what Yang Gong said is TI's Fairchild 2MHz switching power supply circuit. This is information I obtained from a foreign technical forum. He is a German engineer and a well-known figure in the disassembly industry.

Uploaded by a celebrity. As you can see, the black circle is the power supply part of the product.

The red circle is TI's main chip; the blue circle is National Semiconductor's Schottky tube; the yellow circle is National Semiconductor's preamplifier excitation transistor; the green circle is Fairchild's MOS tube. Specifically

The model numbers are as shown in the table next to the picture.

The engineer also announced the test parameters. These four pictures were captured by him using an oscilloscope and spectrum analyzer."

After enlarging the pictures one by one, the seven engineers couldn't help but sigh.

"This efficiency curve, this harmonic waveform, wow, it's really comfortable to watch!"

"The data is really good, but it's too expensive."

"Yeah, it's too expensive."

The disappointment is evident.

Liu Pingwu glanced at everyone and suddenly said: "Actually, there is another plan, which is cheaper than this plan but has similar performance."

Zhang Hongtao sat at the end, holding a signature pen and listening silently. Hearing Liu Pingwu's words, he finally smiled.

Their emotions were being stirred up and down, and the engineers who had been led away by Liu Pingwu unknowingly were in an uproar, asking at once: "What plan? What exactly is the plan?"

"Cheap? How cheap?"

"Is there really such a plan?"

"Dong dong - dong dong!" Zhang Hongtao took the signature pen in his hand and knocked it hard on the table several times.

The engineers all fell silent.

"Listen to Mr. Liu's introduction to us."

"Okay, Mr. Zhang." Liu Pingwu pressed the remote-controlled page-turning pen, and an internal diagram of a chip appeared on the screen.

"SQPower is a company in Hanguo. In the 1980s and 1990s, Sanxin helped TI, National Semiconductor, ADI and other major manufacturers to manufacture analog devices, and accumulated rich technology and experience.

In 2001, Sanxin Electronics separated its power management chip department and established Strong Quick Power, SQPower, which is independently designed and manufactured by Sanxin, and is responsible for its own profits and losses. They have a chip that is similar to TI's 2MHz chip.

The performance of the switching power supply main chip is similar."

SQPower is a tea table filled with cups.

Since its independence, it has not been taken seriously by Sanxin Corporation.

The technology is solid, but the marketing is a mess, and it has not yet opened up the market. It only survives on some orders donated by the parent company.

When the subprime debt crisis hit in 2008, Hanguo's economy was devastated again. Sanxin's mother couldn't even take care of herself, and of course she couldn't take care of SQPower.

In 2009, SQPower was sold to a company in the United States at a low price of US$3.5 million and continued to struggle.

In 2011, another American company took a fancy to its technical advantages and reserves, spent US$120 million to buy it, and then replaced all the power management chips in its products with SQPower.

This American company is called Apple.

"I have a piece of information here. This picture is a 2MHz switching power supply circuit built by SQPower's main chip using National Semiconductor and Fairchild's diodes and MOS tubes. These pictures are the test data of this circuit.
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It can be seen that the efficiency of this circuit reaches 84%, which is only two points lower than the TI National Semiconductor Fairchild architecture circuit..."

Yang Gong and others whispered to each other and discussed in low voices.

"It's only two points short, which is pretty good."

"Awesome, this main chip is really awesome."

Liu Pingwu, Yang Gong and others slowly calmed down and continued talking.

"I have another piece of data here. This picture is a 2MHz switching power supply circuit built using TI's power management main chip, combined with Yinghai's diodes and MOS tubes. These pictures are test data. Its efficiency reaches 100

Eighty-three point three points, only 2.7 points lower..."

Unable to hold back any longer, Yang Gong and others stood up and left their seats, gathered around Liu Pingwu's T30 computer, and studied the two data repeatedly.

A sudden turn of events!

Zhao Xing clenched his fists excitedly, and Jiang Lili pulled Zhao Xing's arm tightly with excitement.

"Mr. Liu, you mean to use SQPower's main chip, combined with Yinghai's diodes and MOS tubes, to build a new 2MHz switching power supply circuit?"

"Yes."

"So what is the performance of this new circuit? How much is the price?" Zhang Hongtao asked.

"How about the performance? I haven't actually tested it, so I don't know." Liu Pingwu replied straightforwardly.

Before Zhao Xing and Jiang Lili could take back their excitement, their faces were frozen. Their mouths were slightly open, and they almost cried.
Chapter completed!