LED lighting driver power chip design process is described briefly
At present, the driving power chip for LED lighting is mostly designed by analog technology, but also designed by digital technology.
The design work of analog integrated circuits for power supply includes: topology design, algorithm design, logic design, circuit design, layout design, etc., involving a wide range of content, cumbersome workload, computer hardware and software tools must be used to accelerate the design cycle scientifically.
The analog integrated circuit power chip from the chip design - layout design - a simple description of the flow process is shown in Figure 1.
Figure 1 Brief description of the analog power chip design process
The topology design is set according to the definition of the chip development, and the rest are served for this purpose. The topology design technology is relatively mature. The most used topologies for AC/DC LED driver chips are Fly-back, Buck-Boost, and Buck (non-isolated). The “control method†has voltage and current types; The operating mode "has CCM (continuous mode), DCM (intermittent mode), BCM/CRM (critical mode), PFM (pulse width modulation), and so on.
The "algorithm design" of analog power chips is part of the chip system design. The core part of the system definition is to implement this algorithm. Of course, other special features and basic functions are also included.
Algorithm design innovation is one of the key technologies of the new generation of chips
At present, the driving power supply of most LED lighting fixtures requires very high electrical parameters of transformers and inductors used in production. It takes a lot of manpower and financial resources to achieve precision, and it is difficult to further reduce industrial production costs. The transformer is manufactured according to the standard algorithm of the transformer provided by the Data Sheet of the driving power chip, which is often not convenient and satisfactorily used in practical circuit applications. The winding process of the transformer requires the product engineer to repeatedly explore in the trial production, and the number of windings is repeated. The increase and decrease of the fine adjustment, the tension of the copper wire, the sequence and method of the cable, the material of the core, etc. all affect the electrical performance of the transformer, thereby consuming the labor and the demanding requirements of the material, so that the transformer and the inductor must be used. The cost of construction has increased a lot.
Whether we can break through and change the innovation of LED drive constant current source chip design technology is what we have to think about. The new solution can output the current inductance to the transformer and inductor when the LED lamp driving power supply is actually used. The parameters such as the VF of the LED are not sensitive.
An anti-traditional or classic chip algorithm design thinking, from a new perspective to optimize chip algorithm design is the key to innovative technology. Figure 2 shows a new design idea using the BP310X series as an example. A new principle of constant current control on the main stage side. It can be found from Fig. 2 that the chip controls the output current peak and the feedback of the auxiliary winding makes the demagnetization time and chip switch The ratio of the period is fixed, so that the output current and the peripheral inductance deviation and the output voltage deviation are independent. The chip control Toff time accounts for half of the whole period, so that the average current Iout is one quarter of Ils_pk, this current expression Is:
Iout=IP_PK/4 × NP/NS
In this expression, the current is independent of the amount of inductance. At the same time, Ip_pk is determined by the chip reference source, which can reach 1%, the turns ratio is also fixed, and the turns ratio is higher, so the output current accuracy is higher.
The deviation of the VF value of the LED and the inductance deviation of the transformer are the biggest problems facing mass production. In general, mass-produced transformer inductance and LED VF will have a deviation of about 5-10%. The BP310X series LED lighting constant current driving power chip adopts this new algorithm design, which makes the constant current precision of the mass production chip can reach 3% or less, and can have a large tolerance to the electrical parameters of the transformer and the inductor. Facilitate the cost of large-scale industrial production and the continuous rapid production of the pipeline, which is truly insensitive to the electrical parameters of transformers and inductors.
The innovative optimized chip algorithm makes the output current accuracy of the LED driver power supply insensitive to external transformers, inductors and other electrical parameters, effectively reducing the manufacturing cost of inductors, transformers and LED lamps.
Fig. 2 A new principle of constant current control on the main stage of BP31XX series
The innovative optimized chip algorithm is a solution that the power chip design company finds from the chip end after it is difficult to match the output of the LED driver power supply to the peripheral transformers and inductors. Algorithm design has its own skills, each method has its own merits, but the purpose is the same. Table 1 is a comparison table of performance parameters of partially isolated LED power driver chips (available by third parties for reference only). It can be seen that many new LED lighting power supply driver chips have adopted this new technology.
Table 1:
Innovative optimization algorithm power chip makes application simple
BP310X adopts this innovative and optimized chip algorithm, which makes the application circuit very simple, and requires few peripheral parts, which is in line with the concept of low cost and industrial production. Figure 3 is a typical application circuit. After the main-stage constant current technology, the secondary feedback circuit no longer becomes an obstacle to the power supply volume and cost, which brings great convenience to the occasion where the power supply volume is extremely demanding. Bulbs, GU10 spotlights, etc. The traditional optocoupler feedback structure also has the problems of optocoupler aging and difficult to pass the safety test. For the application environment temperature of the bulb inside 60-90oC, the reliability problem has become the focus of attention of manufacturers and customers. The maturity of the main-stage constant current technology, especially the innovative driving power chip algorithm design new technology, makes the application circuit become insensitive to certain difficult-to-control parameters of transformers and inductors, for LED lighting power supply and lighting manufacturers. It is said that it is convenient to improve product performance and reduce costs, which is a win-win choice.
There are fewer peripheral components in the circuit, but the power circuit designer should use high quality for limited devices, such as MOS, which has high withstand voltage. Electrolytic capacitors should adopt high sealing, high anti-hydration processing capability and high anti-overload capability. Long-life products with a temperature of 125 ° C for 10,000 hours to adapt to long-term work in high temperature environments.
Figure 3 4-7W isolated constant current drive application circuit of BP3105
E-cig as a substitute of tobacco mainly reminds people of its potential benefits for health. Four ingredients contain in the e-liquid : propylene glycol, glycerin vegetable, nicotine and food grade essence. Nevertheless, smoke from cigarette contains carbon monoxide, tar, arsenic, ammonia, and many other cyanide and acetone.
Advantage
- New ceramic self heating element, Uniform heating
- High reduction, Temperaturecan be accurately controlled
- Safety and Health, Worth a product,Natural and realistic taste,Factory Direct Sale
- Using proprietary technology,Quality assurance, trustworthy
- Oil leakage free, compact, pocket-sized, portable and easy to transport
-
So that smokers can smoke addiction, refreshing, to meet the psychological and physiological needs of smokers, and in line with the habit of smokers for many years.
-
Compared with rechargeable e-cigarettes and mechanical e-cigarettes, the price of disposable e-cigarettes is much lower, which is applicable to a wider range of customers than the first two. It is also the absolute truth for ordinary consumer groups to be cheap.
Wax Device Oem,Thc Wax Device Oem,Marijuana Wax Device Oem,High Cost Performance Wax Device
Shenzhen MASON VAP Technology Co., Ltd. , https://www.masonvap.com