Related issues about the special power supply and customized power supply
The kinds of power supply is divided into a lot of kinds, in addition to my company production of conventional switching power supply and other special switching power supply, such as special
These kinds of switch power supply and customized power supply, power supply is not very common, usually need to customize tyranny.Very of switch power supply used for production and cost ratio
The improvement of higher, of course the price is still the same.In this paper, the special switching power supply and booster function and performance characteristics of switch power supply to do some is introduced:
Special power supply function and performance characteristics
1 > switch power: 500 w – 30 kw within the scope of the high frequency switch power supply, regulated switching power supply, constant power supply, can according to customer special requirements
Design and production.2 > : switch power supply output voltage of 0 v – 600 – v, output current 0-500 – a car power, electric buses, hybrid vehicle power supply, army
Industrial power supply, electricity, telecom base station power, can according to customers in different areas of application, design and production.3 > DC – DC DC converter power supply:
Turn input 24 v – 600 – v output choose between 12-300 – v;Can be produced according to customer requirements into step-up and step-down dc power supply.4 > all the power
With overvoltage, undervoltage, over current, overheat, output short circuit, the meter protection function;
Booster function and performance characteristics of switch power supply
1 > booster switch power: 500 w – 50 kw range, can be design according to customer’s special requirements.2 > booster: switch power supply output voltage
0 v – 600 – v, output current within 0-500 – a, can according to the customer in different areas of application, design and production.3 > DC – DC DC transform
Power supply: input turn 24 v – 600 – v output choose between 12-300 – v;Can be produced according to customer requirements into step-up and step-down dc power supply.
4 > all power supply with overvoltage, undervoltage, overcurrent, overheating, output short circuit, the meter protection function;
Questions about the selection of power filter capacitor
For electronic designers are all know the importance of filter capacitor, but some of the easily neglected problems still need to respect and care.In the switch
Power supply output filter capacitor, and choose the filter capacitor circuit of power frequency is not the same, in power frequency circuit used for filtering the ordinary smelting
The pulsating voltage frequency on container, its only 100 Hertz, charge and discharge time is ms orders of magnitude, in order to obtain the smaller pulsation coefficient, need of capacitance
Volume up to hundreds of thousands of the law, and generally low frequency using ordinary aluminum electrolytic capacitor manufacture, the target is give priority to in order to improve the electric capacity, electric capacity of capacitor,
What loss tangent and leakage current is an important parameter to identify its advantages and disadvantages.
Is widely used in electronic equipment, capacitor, such as filtering, decoupling, high frequency compensation, provide the communication feedback, deaden dc, inhibit the miller effect
, and so on.Alternating current (ac) after a diode rectifier, in order to obtain low ripple voltage, still need to use the capacitor filter.Generally speaking,
Large capacity filter capacitor can provide smoother output current.But the theory and practice can prove that, when capacitance after reaching a certain value, even if again
Increase the capacitance is no obvious effect on optimizing filtering effect, should according to the size of the load resistance and the output current to select the best electric capacity.The filter
Circuit application is most of the aluminum electrolytic capacitor.Now there are two kinds of regulated power supply, is commonly used in electronic devices in series voltage regulator circuit and a switching circuit.this
Two kinds of power supply circuit of the output filter capacitor have different requirements.
As the output filter in a switching power supply with electrolytic capacitor, the sawtooth voltage frequency up to tens of kilohertz, even tens of megahertz
Application, its requirements and low frequency, electric capacity is not the main index, measure its quality is its impedance frequency characteristic, requirement in it
Within the working frequency band switch regulated power supply to have low impedance, such as at the same time, for the power within, due to the semiconductor device produced up to start work
Hundreds of kilohertz peak noise, also can have a good filtering effect, generally low frequency using ordinary electrolytic capacitor at around 10 KHZ, its impedance began to show
Now, he can’t meet the requirements of switch power supply used and sensibility.
Switch regulated power supply for high frequency aluminum electrolytic capacitor, it has four terminal is, the anode aluminum at both ends of the extract as capacitor anode respectively,
The ends of the anode aluminum also raises respectively as the cathode.Regulated power supply current flow from a four terminal capacitance is end, through internal capacitance, again from the other
A positive side to load;Returning from the load current is also flows from the capacitance of a negative end, again from another negative side to negative power supply.
Because the four terminal capacitance has good frequency characteristic, it to reduce the output voltage ripple component and inhibit switch noise peak provides extremely high
High-frequency aluminum electrolytic capacitor and the form of multicore, it will be the aluminum foil is divided into several small pieces of short, with multiple leads connected in parallel to minimize the capacitive reactance
The resistance of the elements, at the same time, with low resistivity of the material and the screw as leading-out terminal, in order to enhance the ability of capacitor under large current.
Laminated capacitors, also known as non-inductive capacitor, electrolytic capacitor core are generally rolled into a cylinder, equivalent series inductance;The structure of the laminated capacitance
And books, due to the direction of magnetic flux through the current offset, and thus reduce the inductance value, has more excellent high frequency characteristics
Make it square, this kind of capacitor, easily fixed, also can be reduced the machine volume.There is also a four terminal and the combination of laminated four-terminal laminated
High frequency electrolytic capacitor, it combines the advantages of both, high frequency characteristic is better.
Put an end to the power industry malignant competition – advocate a virtuous cycle
Switching power supply industry in the development of our domestic fairly quickly, decades switch power industry development in our country has maintained rapid growth.Industrial division
Increasingly clear, because of the power market margins initially attracted a large number of businessmen to invest in production of switch power supply, but also caused the electric switch
The source product quality is uneven.No period of high quality high price products must compete for low quality low price products businesses.Competition in order to hold down prices
To attract customers, part are formed a vicious competition between enterprises, using low price, low quality of raw materials.This natural production cost is reduced, to shape
Product prices low down.So to attract many customers.But that means it is not wise.Product prices low, can’t guarantee quality
.Customers want to return because of quality problem again and again, ask: such a low price how to ensure the quality of products?
Switching power supply industry in China is basically formed by the independent development of enterprises under the market environment, switching power supply industry is a relatively good industry competition,
Marketization degree is higher, therefore, in the market competition, broaden the application aspect, should say it’s quite a success.Also will not, however, high degree of marketization
Can inevitably lead to excessive price competition, therefore, in the switching power supply industry advocates a benign cycle development atmosphere is very important and urgent.
Current, power supply manufacturer in the premise of switching power supply control technology is relatively mature, the enterprise should strengthen the appearance of the product design and the craft to the supporting manufacturers
Switch power supply, high-end products to make high-quality goods, increasing the financial input in die casting box mold, ensure the installation precision, compete with foreign manufacturers products.mid-range
Under the premise of products to meet the basic function, to simplify the design, reduce cost, form a batch, increase the export of products.
The current domestic market competition and market standard situation is bad, often characterized by customers don’t generally pragmatic and competitors is machiavellian, this invisible
In directly affects the grade of the product and quality problems.In other industries such as shoe industry, some enterprises from making false shoes came to make true,
But some are still in producing fake shoes.Switching power supply industry is also like this?But it is can’t see the prospect of a better specification.In international city
The court, European and American developed markets such as the specification, is basically relying on competition.
Believe will mature, switching power supply industry for economic development, designs city-lighting and the improvement of people’s living standard continuously enterprising.
Suggest the customers again.When buying a product in addition to see the product price, be sure to focus on product quality problem.To save money to buy low
The quality of product performance efficiency cannot be guaranteed.Work affects normal power is more trouble.
Soft switching power supply of related knowledge to solve
Relative to the switching power supply, the soft switching power supply may be part of the users do not know, with the constant innovation of technology and the progress of science and technology, some high
Technical content of products from raw materials to each parts due to the various parts assemble into finished products.By a company independently is unrealistic.Division of labor
In more and more detailed, the completion of each product is dozens or even hundreds of up to it to complete.It also made a large number of parts by doing what products
The development of the enterprise.But because of the differences of quality and technology caused the products on the market is uneven.It is also inevitable.This article in view of the soft
Answer some knowledge of the switch power supply.
Definition: a soft switch technology is the semiconductor switch in the open or disconnect when the time is very short, made through the switch of electric current or the voltage on the switch
Is reduced, so as to reduce the switching loss.
Hard switching and soft switching is mainly in view of the switch tube (MOSFET) speaking, hard switching is regardless of the switch tube (DS extremely or CE) voltage or current of the strong
Line turn on or turn off the switch when switch tube (DS extremely or CE) on the voltage and current is larger when the switch tube, between the state of the switch tube
Switch (from on to off, or from close to open) need a certain amount of time, which can cause in the switch tube state switching between voltage and current will have a certain period of time
A hand in the region, the loss caused by the switch tube called a switch tube switching loss.
Soft switch is current by detecting switch tube or other techniques, do as the switch tube voltage, or through the switch tube current is zero on both ends to conduction or shut off
Close the tube, so that the switch tube wouldn’t exist switching loss.
In general soft switch high efficiency (because there is no switching loss);Operating frequency is higher, PFC or transformer can reduce the volume, so the volume can be done
The smaller.But the cost is relatively high, the design is more complex.Agree with 3 | comments
MOSFET switching power supply, the main control components, ICBT and thyristor is used as a switch, and, according to switch on/off control energy
The flow of pass.Here, because just switch on/off control process, so in theory, can be without loss of power control, and
Can continuous through changing the duty ratio of switch power control.In this way, improve the work frequency of the switch, can make electronic equipment power small, lightweight
, or to improve the control performance.In practice, however, use of semiconductor components are not ideal, has the certain conduction and by the time,
In addition, there also exist in the control circuit wiring inductance and leakage inductance of the transformer, the influence of the parasitic capacitance, diode accumulation charge, etc.These factors will produce
Switching loss and surge, making electronic set the performance degradation, and the formation of the noise pollution can also affect the normal work of the electronic equipment.
With the popularization and development of semiconductor integrated circuit, electronic set the more and more small, lightweight, it is pressing for the power of the dc flow transducer
Also want to miniaturization.Therefore, the high frequency switch power supply into a major issue.And as the effective means of high-frequency soft switch technology, researchers around the world
Part is the positive starting from the two aspects of circuit analysis and practical application of research development.
Usually, the switch element on the Voltage waveform is sine wave shape is called Voltage resonant converter, its ZVS with zero Voltage switch (Zer. Voltage
Switching) way to work, and through the switch of the current waveform is sine wave shape is called the current resonant converter, its at zero current Switching ZCS (Z
Ero Current Switching) way to work.Above two kinds of converter called quasi resonant converter, and spectrum of vibration circuit only when the switch tube conduction or cut-off
Work, so as to reduce the switching loss is called a partial resonant converter.These resonant converter is soft switching power supply, is to control the switch tube conduction
Between so that the dc output voltage stability of power system.
These resonant converter constitute the characteristics of the soft switching power supply is as follows: (1) reduce the switching loss of the switch components, can work in high frequency switch from
The light of the components used to achieve small.(2) in the traditional switching power supply, switching noise is the main reason caused by the parasitic capacitance, the resonant transform
In the effective use of these parasitic capacitance as part of the resonant components, such as this, which can effectively suppress noise;(3) due to the high frequency of switching frequency
, can make the inductor, transformer, capacitor and other components in miniaturization, increases the size of the feedback loop bandwidth, accelerate the transient response of the converter.
How to make use of the oscilloscope measurement and analysis
Although in recent years of switch power supply design technology to more than one level higher than that of before, but it only has high-tech science and technology personnel of enterprises with it
Kind of ability.And hit in recent years of switch power supply design aspects: on the one hand on the small and medium-sized enterprises and international high-tech vary widely, switching power supply technology competition
In the box;Rising energy costs, on the other hand, allows the user in choosing a product, more and more inclined to high efficiency, and this also gives designers
Bring certain pressure.These requirements make switching power supply design researchers must spend more time and energy in terms of design, such as the product into
Measurement and analysis of power equipment.
Switching power supply power measurement analysis commonly used filter, mainly has the following several aspects to consider:
1, analysis of input lines 2, input line 3, open/close time analysis, analysis of modulation can be subdivided into 4 (frequency cycle time/space/time
Is pulse width than/time/time)
5, and 6 power equipment analysis, transient response analysis of 7, 8 output analysis, automatic deviation correction and U1880A migrated last step: generate a report
The development of market economy, technological innovation and the birth of new and high science and technology from all walks of life to make the upgrading of products faster.A few small enterprise can’t adapt to, the skill
Behind the market average, will gradually be eliminated.And those retained enterprise but still need to continue to strive to do the most popular with users of the products, and from
Today’s content, now the integration of market economy makes manufacturers need to take into account the user’s demand, can maximum limit satisfy the user
The needs of the enterprise also to the pursuit of goals.
The composition and functions of different parts of switch power supply
Since switch power to enter the Chinese domestic market, a large number of emerging enterprises began to join the industry, makes switch power supply of the domestic market competition is increasingly fierce.by
In technological innovation and productivity levels.Switching power supply has changed the composition of the components.No matter from the appearance, volume or technology.Switch electrical
Source in recent decades in domestic development with each passing day, so to speak, a high and new technology unceasing development, the power electronics industry technology innovation, also bring switching power supply industry
To a certain degree of influence.Have to say this technology industry technology innovation that makes the market has changed constantly.Product structure of high and new technology
The change.This article is about the modern switching power supply technology to introduce the structure:
Switch power supply, the composition of the main input power filter, the input rectifier filter, inverter, output rectifier filter, control circuit and protection circuit.
Their function is:
: 1. The protection circuit when the switch power supply when the over voltage, over current, short circuit, the protection of the stop work in order to protect the load of switch power supply circuit and power supply itself.
2. The control circuit: to test the output dc voltage, and its comparison with the reference voltage, amplification.The pulse width modulation generator, so as to control converter in order to protect
The stability of the output voltage.
3. Input rectifier filter: the power input voltage rectifier filtering, provide dc voltage converter.
4. The output rectifier filter, is of high frequency ac voltage rectifier converter output filter to dc voltage, but also to prevent the high frequency noise disturbance to the load.
5. Inverter: is a key part of the switch power supply.It to dc voltage transform into high frequency ac voltage, and have the effect of isolation part will output to the input power grid.
6. Input power grid filter: remove from power grid, such as motor start-up, electrical switches, lightning interference, but also prevent switching power supply
Diffusion frequency noise to the grid.
With the innovation of new and high technology.After the development of the power industry, the switching power supply technology innovation will be more mature.Maybe one day switch power supply will be another full
Instead of new products.But for now, the world market is so big or the demand for switching power supply, as long as to ensure the quality of the products and services, will be the same in this competitive market occupation belongs to own a piece of heaven and earth.