How do you know the conversion rate of a power bank? What makes a good conversion rate!

Charge the power bank to a full charge. Then charge your battery. See how many times you can rush.

For example, a 5000 mAh power bank can charge a 1500 mAh battery once. Then the conversion rate of this power bank is 1500*, then the conversion rate of this power bank is 75%.

Generally, the conversion rate of mobile power is about 70%. As long as it is not less than 65%, it is considered qualified. Don't buy a miscellaneous power bank.

Pinsheng, Yubo, and Scud are much better. Pinsheng quality is the best among all power banks.

<>This is the calculation of the power bank conversion rate found on the official website of Pinsheng.

The conversion rate of the power bank is to know the approximate test with the mobile phone a few times. To know that accurate requires professional instruments, because there will also be a conversion rate on the mobile phone.

Now merchants are advertising that the conversion rate of their products can reach more than 90% This is true and false, this more than 90% is the conversion rate on the mobile power board, not the output, and the conversion rate in the user's mouth is the conversion rate of the real charge to the mobile phone.

As far as the current technology is concerned, the conversion rate of mobile power banks can be more than 75%, which is very good. Don't believe that the 90% conversion rate is a play on words that the merchant is playing with us, or it's just deceiving you.

Power Bank Conversion Rate:

Generally, the charging capacity of the mobile power bank will be marked, but the power supply will be lost in the process of use, we call the actual amount of electricity charged into the mobile phone called the rated capacity of the mobile power supply, and divide this value by the identified capacity of the mobile power supply is the conversion rate of the mobile bank.

Generally speaking, the conversion rate of mobile power banks on the market is now about 85%, which is considered very high.

Power Bank Conversion Rate Calculation Method:

There are two ways to calculate the conversion rate of the power supply of the mobile shed, one is to use the conversion formula to calculate, and the other is to use the watt calculation formula to calculate.

1.Conversion Formula:

a (mobile power capacity converted to amps) * mobile phone battery capacity converted to amps) * 5v * 85% ** rate).

For example, a 10,000 mAh power bank is converted to 10A and a 2,000 mAh mobile phone battery is converted to 2A

Then: 10 * * 85% = times.

That is, a 10,000 mAh power bank can be charged with a 2,000 mAh battery.

2.Watt formula.

The calculation method of watts is more accurate, and it is generally used to calculate the battery life of the laptop power bank and the laptop battery life.

p (watt w) = u (voltage v) i (current a).

Take Dibuco 32000mAh notebook power bank as an example to calculate and charge a notebook with 35W H, the calculation method is the built-in battery voltage) * 32 (32000mAh converted to A) = and then with 35W H notebook power supply time is **The conversion rate is 89%, and the conversion rate of this product is high).

We are very people in bai buy charging du bao back and find that the advertised zhi writes a high capacitance, but the dao is actually rushed to the capacity of the mobile phone is very different. What is the so-called loss of mobile phone power supply? What does power bank conversion rate mean?

Today, Fang Qing will come to talk to you about this issue. The conversion rate of the power supply refers to the actual total discharge of the power supply. The power consumption of the power supply is related to the material of the battery cell and the circuit structure, and the power consumption of the poor power bank itself can reach about 30%, when the power bank is charging the mobile phone, the charging cable and the charging connector are generated by heat, and the power consumption is 5% 10%.

Therefore, after subtracting the power consumption of these seven, seven, eight, and eight combined, it is the actual total amount of our actual discharge of the mobile power supply. It feels like there's not much left, right, so when buying a power supply, we have to pay attention to the composition of his battery cells, as well as the buyer's evaluation. How much of a power bank has a high conversion rate?

At present, the conversion rate of power bank in the industry can be 70% and 80%, which is very high. Most of the conversion rates on the market are around 60%. Fang Qing has seen many sellers on the bunk or something, in order to achieve high sales, often advocate that their power conversion rate is super high and can reach 95%, **affordable, what is the problem of battery cells, he flickered in the past and said that it is absolutely safe and high conversion cells, you see that the conversion rate is 95%.

Alas, it specializes in deceiving many of our consumers who don't understand. At present, it is the highest and safest conversion rate of high-grade lithium polymer cells, about 70%. Like Sino's 8000 mAh mobile power supply, the battery cell is a high-grade lithium polymer, and it is also good in appearance.

1. Conversion rate of power supply output:

It refers to the power consumption in the process of power bank output, excluding the power consumption in the process of boosting, and the proportion of the actual output power to the total power of the power bank. It is related to the power supply itself, which can be improved by optimizing the circuit design, etc., and is an important indicator to measure the advantages and disadvantages of the power supply. The output conversion rate of Pinsheng mobile power supply is 82%-86%, which is the highest level in the industry.

2. Conversion efficiency is the ratio of the output power of the power supply to the input power: that is, the power conversion efficiency = the instant output power provided by the power supply for the host 100% of the instant power of the input power supply. Generally speaking, PC power specifications have certain requirements for conversion efficiency.

Initially, the power conversion efficiency was only about 60%, and in Intel's ATX12V power supply specification, it is stipulated that the conversion efficiency of the power supply shall not be less than 68% at full load, while in the ATX 12V, the conversion efficiency of the power supply shall not be less than 80%. Therefore, when purchasing a power supply, we can roughly understand the level of its power conversion efficiency from the power supply specifications it follows.

How to calculate the conversion efficiency of the power supply? 】

I often hear about the conversion rate of power, and there is some confusion about this concept.

I have the following understandings:

A power supply rated at 380W, if it is 80plus** conversion rate) is 80%, then the actual output power is; Then in fact, if the power of your whole machine is on 300w, it can't be satisfied.

With the 380W power supply, the output power is 380W, and the actual power consumption is 380, which means that the rated output needs to make the meter run more watts.

How exactly should it be understood?

Rated 380W means the maximum power of the continuous and stable output of the power supply, as for the conversion efficiency, it refers to the power of the power output of the power supply divided by the power of the input end, so the landlord understands.

Rated 380 is the power output, DC rated power is 380W, and the actual consumption is AC 380

There is the actual measured output charge divided by the battery level, i.e. 4240 5200 = 81%.

4240 mAh divided by 5200 mAh is the conversion rate.

Actual output of power bank Power bank capacity Power bank conversion efficiency Mobile phone charging conversion efficiency * Adapter line adapter efficiency.

The conversion efficiency of the general mobile power supply is about 80%, and the better one can reach 85-88%, and the conversion efficiency of ordinary mobile phone charging is about 75%, and then the loss of the adapter is generally 10%, so the conversion efficiency of the adapter is 90%, so the mobile power supply of about 5000mAh can be fully utilized by the mobile phone in the end: 5000*

First of all, a brief explanation of the charging principle of the mobile power supply, the current mobile power supply uses a built-in battery cell (18650 and polymer), the nominal voltage is, and the standard input voltage of digital products such as mobile phones is 5V. Therefore, the power bank needs to output 5V through the boost management board to charge mobile phones and other devices. According to the law of conservation of energy, a 6000mAh power bank, the energy of the battery is 6000mAh watt-hour), after the boost is converted to 5V, the overall energy remains the same, but the power is 22Wh 5V = 4400mAh, which is like a glass of water poured into a 5L cup.

After the first step of conversion, only 74% of the original 6000mAh power remained, and this 4400mAh is the actual power that can be supplied to the mobile phone.

Next, what we have to do is to connect the power bank and the mobile phone with a data cable for charging, so the question arises again, can the power of the 4400mA all reach the battery of the mobile phone? The answer, of course, is no, and there are still a lot of losses in the charging process

1. Circuit conversion loss. I believe we all know that the power bank will heat up when charging, and according to the law of conservation of energy, the heat emitted is actually the energy of the built-in battery.

2. Resistance loss. When charging a mobile phone, the built-in battery of the power bank and the mobile phone battery are connected through a circuit board and wires. We know that all conductors have resistance, and conductors without zero resistance (superconductors are not discussed here).

The main physical property of resistance is to convert electrical energy into heat energy, so during the charging process, the conductor will generate heat, and if there is heat generation, there will be energy dissipation and loss.

3. Voltage loss. The discharge voltage of lithium battery is not static, and the safe range of discharge voltage is that the power conversion will also be different. Generally, the discharge voltage range is between, and 80% or more of the battery can be discharged, and if it is outside this range, the loss of power will increase.

4. Power supply loss. When charging a mobile phone, the power bank not only charges the battery, but also supplies power to other components, especially the screen is a large power consumer.

5. Self-operating loss. During the charging process, the power bank also needs to consume electricity to maintain its own operation, and this power must also be supplied by the built-in battery cells.

Through the above losses, the actual power that reaches the mobile phone battery is about 85% of the actual power of 4400mAh, which is 3774mAh. From the cell capacity of 6000mAh to the actual output of 3774mAh, about 38% of the power was lost. In other words, the actual conversion efficiency is only about 62%.

Through the above explanation, I believe you should understand that the efficiency of mobile power supply in practical application is not high. The mobile power supply that everyone usually buys is basically at this level, and it cannot reach more than 90% of the manufacturer's publicity. Judging from the dozens of mobile power products that the author has reviewed, most of the conversion efficiency is between 60%-63%, and occasionally the conversion efficiency is only 70% when the materials are better.

Basically, it is calculated according to the capacity, for example, if your capacity is 2000MH, you have such a large capacity, and there will be losses in the charging process, and the losses are different for different batteries and circuits.

For the actual conversion rate of mobile power, in fact, this problem is difficult to measure with a few accurate numbers, it can be said that the vast majority of the efficiency conversion logo of the mobile power supply on the market is the target such as more than 85%, 90% and other numbers, regardless of the authenticity of the data, these data for consumers, what is the significance?

The conversion efficiency of energy has always existed in the conversion process of resources and energy, including electric energy, thermal energy, etc., and most of the numbers will not be very high, so some mobile power banks on the market will mark their conversion rate as more than 90% or 95%, in fact, I believe that they themselves will not believe this data. The conversion efficiency can reach about 75%, and the mobile power supply is basically a qualified mobile power supply, and there is no need to deliberately pursue how beautiful and gorgeous the data is.

1. The current transmission efficiency of the internal line of the power supply, which is mainly reflected in the top loss, and at the same time, its efficiency can be felt through the heat generation of the mobile power supply. The wire loss is mainly related to the length and thickness of the wire. The longer the thread, the greater the loss.

If it is smaller, the resistance will be larger, and the loss will naturally be large. If the wire is made of non-pure copper materials, it will also cause a sharp increase in losses. It is important to use a high-quality charging cable with a short stance, and some original cables are relatively long, which is also a key factor in increasing losses.

2. The charging efficiency of the mobile power supply, because the mobile power supply to charge the mobile phone is to go through two energy conversions, in the energy storage process of converting the electric energy into the mobile phone charging battery, because of the internal charging circuit of the mobile phone, it will lose some energy, mainly in the loss caused by the voltage reduction and current limiting, this kind of loss is basically impossible to change, and the characteristics of the mobile phone itself.

3. The boost efficiency of the mobile power supply, simply put, rises from the cell voltage to the 5V voltage that can be charged, the efficiency of this transfer is generally about 80%, and the good ones can be slightly higher, and the efficiency of the intelligent boost mode is higher than that of the non-intelligent one.

The conversion rate of Changhong mobile power supply is as high as 86%.