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Differences in switching power supplies and power of imitation

Issuing time:2015-07-16
SHENZHEN Branch Power Technology Co., Ltd.-Differences in switching power supplies and power of imitation

Imitation power: the power transformer, through the core, the coils in the coil turns ratio determines the voltage across, the core role is to pass changes in the magnetic field, (Chinese) primary coil at 50HZ frequency creates a change in magnetic field, This change of the magnetic field passing through the core to the secondary coil, the secondary coil in the inductive voltage generated, so the transformer voltage change is completed.


Power imitate defects: a coil, the core itself is a conductor, then they will because the self-inductance current heat (loss) in the process of transformation of voltage, the power transformer is very low, usually does not exceed 35%.


Differences in switching power supplies and power of imitation


Use audio equipment Amplifier Transformer: The transformer power amplifier needs to provide more power output, so long as the number of turns through the addition, the core volume increased to complete, the number of turns and the core volume added will exacerbate the loss, so the high-power amplifier transformer is necessary to do very big, so it will lead to: clumsy, heat.


Switching Power Supply: Before current into the transformer through the switch function of the transistor, the current frequency 50HZ we usually raised to tens of thousands of HZ, at such a high frequency magnetic field to change the frequency to reach tens of thousands of HZ, then, it is possible to reduce the coil turns, the volume of the core to achieve the same voltage conversion ratio, since the coil turns, the volume reduction of the core loss is greatly decreased, the power switching power supply typically reach 90%, while the volume can be made very small, and stable output, the switch The power supply has the power to imitate hard to reach strengths.


(Switching power supply also from a lack of, such as the output voltage lines involving switching noise, linear power are none)


Audio equipment - in the use of switching power amplifier: Describe the process of switching power supply has been marked advantage in switching power supply, so even high-power amplifier, switching power supply capable of doing the same very fine, small, and now the domestic digital amplifier in Shenzhen Cui Paz digital audio equipment company most the first digital amplifier, they now has grown to T class pure digital amplifier, and next-generation S class amplifier is also being developed, and details see the following materials:


Digital Power


In simple and easy to use, little change request parameters using the occasion, imitation goods more competitive power due to its use of targeted hardware-curing can be accomplished, and in many uncontrollable factors, real-time response is faster, more demand an imitation of system power management, the messy, high-performance system application, the digital power is an advantage. In addition, the clutter of multiple system transactions relative imitate power, digital power supply is the result of software programmed to perform a wide range of use, scalability and repeated use of transport users can have the convenience to change their job parameters, optimize the power system. After the real-time over-current maintenance and handling, it is possible to reduce the number of external equipment.


Differences in switching power supplies and power of imitation


In the clutter of multiple system transactions relative imitate power, digital power supply is the result of software programming to complete a wide range of use, scalability and repeated use of transport users can have the convenience to change their job parameters, optimize the power system. After the real-time over-current maintenance and handling, it is possible to reduce the number of external equipment.


Useful DSP digital power control, as well as with the MCU controlled. Relatively speaking, the choice of digital filtering methods DSP power manipulation, manipulation of power more than the MCU's power demand satisfaction messy, real-time response speed, power regulator performance is very good.


What are the advantages of digital power it is first programmed, all functions such as communications, inspection, telemetry, etc. are available software programming is complete. In addition, the digital power with high performance and high reliability, is very sensitive.


Disturb: SCM between digital and imitation, since the digital signal is a wide spectrum of the pulse signal, so the main digital to imitate some of annoy some strong; not only are usually chosen digital power supply are separated and imitation, with between them filter adapter, in case some of the higher requests, such as certain internal microcontroller AD converter AD conversion carried out, it is often to make some figures into hibernation, the vast majority of some digital logic to stop work to avoid them to imitate some constitution disturb. If disturbed grim, and even be able to leave with two power supplies, power inductors and capacitors usually blocking on the line also can be the entire board of the power of numbers and imitate some parting linked together, with a parting path directly to the power supply filter capacitor the solder joints. If the confrontation disturb request is not high, it is possible to arbitrarily connected together.


(1) if you do not use chip A / D maybe D / A function, can not distinguish the digital power supply and imitation.


(2) If the use of the A / D maybe D / A, see the need to consider the power supply design。


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