Some Factors Needing Attention in the Design of LED Lamp Power Supply

At present, the LED fluorescent lamp lighting market is relatively active, and the manufacturers of LED driving power supply are mainly divided into three types: the first type is to develop factories for LED chips or LED lamps, which infiltrate downstream; The second is the factory that used to do general lighting; The third category is completely new factories. They used to do power supply or other products or start a new business.

LED fluorescent lamp power supply is a very important component of LED fluorescent lamp. If it is not selected properly, LED fluorescent lamp can not play its due performance, and even can not be used for normal lighting. Here are some small suggestions on the lighting power supply of LED fluorescent lamp for your reference.

1. Why must the power supply of LED fluorescent lamp be constant current?

The characteristics of LED semiconductor determine that it is greatly affected by the environment. For example, the current of LED will increase with the increase of temperature; With the increase of voltage, the current of LED will also increase. Working over the rated current for a long time will greatly shorten the service life of LED. LED constant current is to ensure that its working current remains unchanged when environmental factors such as temperature and voltage change.

2. How can the power supply of LED fluorescent lamp match with the lamp board?

Some customers first design the lamp board and then find the power supply. They find it difficult to have a suitable power supply, or the current is too large and the voltage is too small (such as I > 350mA, V 180V), resulting in serious heating, low efficiency, or insufficient input voltage range.

In fact, choose the best series parallel connection mode, the voltage and current added to each LED are the same, but the effect of the power supply can play the best performance. The best way is to communicate with the power supply manufacturer and customize it.

3. What is the most appropriate working current of LED fluorescent lamp power supply?

Generally, the rated working current of LED is 20 mA. Some factories use it up at the beginning and design 20 mA. In fact, the working heat under this current is very serious. After many comparative tests, it is ideal to design 17 19 ma. It is recommended to design 18 ma.

4. What is the working voltage of LED fluorescent lamp power supply?

The recommended working voltage of general LED is 3.0-3.5v. After testing, most of them work at 3.125v, so the calculation formula of 3.125v is more reasonable. Total voltage of M lamp beads in series = 3.125 * M.

5. How wide is the series parallel connection and voltage of LED lamp board?

In order to make the LED fluorescent lamp work in a wide range of input voltage (full voltage) AC85 265V, the LED series parallel mode of the lamp board is very important. Since the current power supply is generally a non isolated step-down power supply, when a wide voltage is required, the output voltage shall not exceed 72V, and the input voltage range can reach 85 265V. That is, the number of strings in series does not exceed 23.

The number of parallels should not be too large, otherwise the working current is too large and the heating is serious. It is recommended to be 6 parallel / 8 parallel / 12 parallel. The total current should not exceed 240 ma. There is also a wide voltage scheme, that is, first raise the voltage to 400V with L6561 / 7527, and then reduce the voltage. It is equivalent to two switching power supplies, and the cost is twice as expensive. This scheme is not cost-effective and has no market.

6. What is the relationship between series parallel connection of LED and PFC power factor and wide voltage?

At present, there are three situations of power PFC in the market: one is without PFC special circuit, and its PFC is generally about 0.65; One is with passive PFC circuit, the lamp board is well prepared, and the PFC is generally about 0.92; Another one is made of active 7527 / 6561 circuit. The PFC can reach 0.99, but the cost of this scheme is twice as expensive as the second scheme.

Therefore, the second scheme is more. For passive PFC circuit: also known as valley filling PFC circuit, its working voltage range is half of the peak value of AC input voltage. If the input is 180V, the peak value is 180 * 1.414 = 254v, half of the peak voltage is 127V, and then minus the step-down differential voltage of 30V, the maximum output is 90V, so the number of LED beads in series is up to 28.

Therefore, in order to obtain a relatively large power factor, the number of lamp beads in series cannot be too much, otherwise, it will not meet the requirements of low voltage.

7. What is the most appropriate constant current accuracy of LED fluorescent lamp power supply?

The constant current accuracy of some power supplies in the market is too poor. For constant current schemes such as pt4107 / HV9910 / bp2808 / smd802, the error reaches ± 8% or ± 10%, and the constant current error is too large. The general requirement is ± 3%.

According to the error of 3%, 6 channels are connected in parallel, and the error of each channel is about ± 0.5%. If 12 channels are connected in parallel, the error of each channel is about ± 0.25%, which is sufficient. If the accuracy is too high, the cost will increase greatly. And for LEDs, 17 Ma culture and 17.5 Ma culture have little effect.

8. Isolated / non isolated

Generally, if the isolated power supply is made of 15W and placed in the LED lamp tube, the transformer has a large volume and is difficult to put in. Especially for T6 / T8 tubes, it is almost impossible, so the isolation can only be 15W, few more than 15W, and the price is very expensive. Therefore, the cost performance of isolation is not high. Generally, non isolation accounts for more mainstream, and the volume can be made smaller, with a minimum height of 8mm. In fact, if the non isolation safety measures are well taken, there is no problem.

9. LED fluorescent lamp power efficiency

Output power (voltage of output LED * output current / input power). This parameter is particularly important. If the efficiency is low, it means that a large part of the input power is converted into heat and emitted; If it is installed in the lamp tube, it will produce a very high temperature. Coupled with a light efficiency ratio of our LED, it will stack to produce a higher temperature.

The life of all electronic parts in our power supply will be shortened with the rise of temperature. Therefore, efficiency is the most fundamental factor determining the service life of the power supply. The efficiency cannot be too low, otherwise the heat consumed on the power supply is too large. Generally more than 80%, but the efficiency is related to the matching connection of the lamp board.

10. LED fluorescent lamp power supply size

Height is the main limiting factor. It is generally used for the size of T6 pipe / T8. The height shall not be too high ≤ 9mm. T10 tube height ≤ 15mm. The length can be longer, which is easier to dissipate heat.

get in touch with us
Artículos recomendados
How Does Traditional Market Research Integrate Blockchain
Insights network launched the install blockchain, which is one of the most unique blockchain technology use cases seen in the world. In this article, we will discuss how our blockchain Market Research Network works from a technical perspective, and how this technology can improve data quality, reduce costs, reduce fraud, and empower data creators.Next, we will focus on some of the most common problems in the traditional market research industry. Since the birth of the Internet, there has been no innovative standard practice in the traditional market research industry.Problem: low quality users. Unconfirmed false data. The traditional panel only allows users to register and select demographic information. We call it personal data value (age, gender, income level, number of children, pet owner, etc.). IP address detection is the basis for deciding whether to allow consumers to participate in the survey. In some cases, a method called "river sampling" is used to conduct real-time surveys of respondents. In this method, anyone who visits the survey link will begin to be screened for demographic questions and enter the relevant surveys (if available). This will lead to a poor user experience, which we will discuss in another article on this blog.Solution: verify the blockchain account. The submitted value is assigned to the install blockchain account as a hash value after verification. The insights network blockchain authentication account is assigned a hash value, allowing the account to participate in the smart contract. The identity is verified by a third-party authentication partner, and the value of the profile is submitted as an unexplained hash value, so it is impossible to know what value is assigned to each user. We use our patent application zero knowledge proof authentication scheme as a filter to ensure that authentication partners cannot track the documents they are validating. The technology we are applying for patent will be published and disclosed in detail before the end of 2019. Next, you will see the account verification record that occurs in real time and recorded on the blockchain. In this example, the account "fbtiezh3sty4" has received the authentication credentials assigned to its account and submitted to the install blockchain as "commit".Install blockchain record of the validated profile value submitted to the blockchain accountProblem: poor user experience. When conducting the survey on the traditional market research platform, a method called "river sampling" is adopted to conduct real-time survey on the respondents. In this method, anyone who visits the link will begin to be screened for demographic questions and guided to the relevant survey (if any). This leads to a bad user experience, and users constantly jump out of the survey in the process of accepting the survey. This is a waste of investigators' time and creates great frustration among the team members, resulting in a low retention rate of the team. For example, a requester can set a condition that only men aged 30-40 who drive a white car, own a dog and have mortgage debt are eligible to participate in the survey. Instead of predetermining these values before service users, they ask them when investigators conduct surveys. Some surveys may take 45 minutes to complete. Imagine that you spent 25 minutes completing a survey, but when they asked you if you had a pet and you said no, you were rejected. What would you think. This happened to most respondents.Solution: determine the "match" in advance before providing users with investigation opportunities. Through the smart contract on the install blockchain, you can find the value of the blockchain account submitted to each user and the local storage of the encryption profile value on the user's device. Every time a survey opportunity is created and funded, it enters the insights network data exchange smart contract. The contract then polls each device connected to the network for a device that matches the requested survey. The same selection criteria as traditional market research products can be set by the requester, but it does not allow anyone on the local IP address to access the survey - just to pop up unqualified participants afterwards - the smart contract searches for active devices on the network and only shows the survey opportunities to providers who meet the exact criteria specified by the requester. We use the so-called disconnection circuit to calculate the encryption profile value of each user to determine the "match". During the matching process, encrypted data polled for eligible demographic data will never be decrypted - giving users complete control over the visibility of their data. Here is how to record a match on the blockchain:Complete the "matched" install blockchain recordOnce a match is determined, the provider can see an investigation opportunity. Users can view the compensation provided for completing the survey, the personal data requested and the submitted data, and agree when exchanging personal data and responding to the survey. The submitted answer cannot be represented by a hash value.Install blockchain record for data exchangeQuestion: can you really believe these data? Most panel companies that complete the brand survey sample provide data sets to brands in an opaque situation. Previously, the industry has been plagued by the sharing of personally identifiable information (also known as "PII"). However, with the introduction of the general data protection regulation (gdpr) by the European Union (EU), this system has undergone major adjustments. It is illegal to collect consumers' personal identity information and sell it to a third party without consumers' consent. If the PII of consumers cannot be shared, it is more difficult to provide accurate information about the surveyed users. Nevertheless, most online panel companies have completely unauthenticated user databases, and trust in people is the only determinant of data quality.Solution: the blockchain can verify the transaction ID. When running an example on the insights network, the blockchain transaction ID is associated with each respondent. This creates audit trails that are not available in the current market research industry. There is now a clear record of team members' submissions and the relevant summary values of each team member. In addition to transparency, these transaction IDS can also be used as your consent records, that is, the consumers you investigate and exchange data agree to the data exchange you pay for them. Some gdpr laws require applicants to keep records of subjects' consent. Using the insights network, this feature is built-in to the end-to-end experience.The following is a screenshot of the data export of a survey recently launched by insight networ. As the requester, this is the data you paid and the data you received. As an additional feature, insights network uses one-time pad encryption for all data you purchase. This means that insights network cannot pry into the data set you pay as a requester. After you export the data, this is the only time you can export the data.Results of a survey sponsored by insights network on the popular cryptocurrency chainlinkProblem: slow invoicing and long revenue turnover time. At present, the invoicing time of the market research industry needs at least 60-90 days, and a brand can pay the expenses of researchers. This means that team members also have to wait for their bonus. The core reason is the lack of high-quality data and deceptive survey responses that need to be evaluated and filtered from the final data set. This may take several weeks for the brand to comb through the data and determine which data sets are available and which are false. This is a particularly painful experience for group companies because they are waiting for feedback from the brand. Basically, the brand tells them how much they will get from the data set provided by group members.Solution: early data verification and smart contract payment data exchange. As mentioned in this article, the verification of profile values, matching on blockchain and smart contract governance create a more efficient and high-quality end-to-end experience. The last thing to record is the payment scheme. Because surveys can be provided to pre-determined, pre validated audiences, payments occur immediately and are subject to smart contracts. Install cryptocurrency provides funds for the smart contract according to the budget determined by the requester, and pays the provider with blockchain transaction immediately after the provider submits and agrees to the data exchange. The following is the transaction ID of the data exchange smart contract paid to the provider who completed and agreed to exchange in the network.Blockchain transaction ID of payment data exchangeCryptocurrency payments on the blockchain and install blockchain are borderless and can be sent to anyone around the world within 1 second. It also opens up access to emerging markets that were previously inaccessible due to the collapse of their banking systems.Development prospectAt present, we are running the survey sample on the install blockchain network as the first use case of insights network. This technology has unlimited scalability, can safely verify data, and communicate privately on the network in a transparent record, such as sending bitcoin payment to friends. Some future use cases we are dealing with include releasing previously unavailable data exchange / sharing opportunities, such as nuclear power plant data exchange, PII involving Enterprise Market Research (Q4) using secret state data prediction, and simpler use cases, such as receipt data exchange and micro customer experience survey. The most beautiful aspect of blockchain technology is the global cooperation opportunities it provides.Source: blocknet
Reasons Why We Should Impose Tariffs on Goods From China...?
Microsoft Officially Launched a New Surface Pro X Product in China
What Does Empty Space in an Atom Consist Of?
Ti Introduced Tps54062's Latest 50mA, 60V Synchronous Step-down Converter, Which Can Simplify the De
MCU Knowledge Is One of the Foundations of Linux Driver Development
"Internet Plus Medical" Has Been Arranged by Internet Giants, Which Promotes the Development of the
Stories and Songs
Forecast of Artificial Intelligence Development in 2020
Two Attitudes Towards Hydrogen Fuel Cells at Home and Abroad
related searches
How Does Traditional Market Research Integrate Blockchain
Reasons Why We Should Impose Tariffs on Goods From China...?
Microsoft Officially Launched a New Surface Pro X Product in China
What Does Empty Space in an Atom Consist Of?
Ti Introduced Tps54062's Latest 50mA, 60V Synchronous Step-down Converter, Which Can Simplify the De
MCU Knowledge Is One of the Foundations of Linux Driver Development
"Internet Plus Medical" Has Been Arranged by Internet Giants, Which Promotes the Development of the
Stories and Songs
Forecast of Artificial Intelligence Development in 2020
Contact Us
Contact Person: AI customer service
Tel: +86 0757-23368757
Address: No.119, Shuiyin Road, Yuexiu District, Guangzhou 
WHATSAPP: 13885223350
Better Touch Better Business
Contact Sales at JuJiao.
Call Us
+86 0757-23368757
Copyright © 2021 FOSHAN SAN DUN Furniture CO., LTD. | All Rights Reserved |Sitemap