It is the ability to provide a stable voltage and frequency of the power supply called AC stabilized power supply. At present, most of the domestic manufacturers do is AC voltage stabilization. The following combines the market have AC stabilized power supply briefly described its classification characteristics.
Parameter adjustment (resonance) type
This type of regulated power supply, the basic principle of voltage regulation is the LC series resonance, the early emergence of magnetic saturation regulator belongs to this category. It has the advantage of simple structure, without many components, reliability is quite high voltage range is quite wide, anti-interference and anti-overload capability. Disadvantages are energy consumption, noise, bulky and high cost current sensor (currentsensor).
In the magnetic saturation principle based on the development of the formation of parameter regulators and our country in the 50s has been popular "magnetic amplifier adjustment electronic AC regulator" (ie, 614 type) are such principles of AC regulators.
Autocoupling (ratio) adjustment type
1, mechanical voltage regulator type, that is, the servo motor drives the carbon brush in the autotransformer winding sliding surface to move, change the ratio of Vo to Vi, in order to achieve the output voltage adjustment and stabilization. This kind of voltage stabilizer can be from several hundred watts to several kilowatts. It is characterized by simple structure, low cost, the output waveform distortion; but due to the carbon brush sliding contact easy to produce sparks, resulting in brush damage or even burned and failure; and voltage adjustment speed is slow voltage sensor, (voltagesensor).
2, change the tap type, the autotransformer into a number of fixed taps, through the relay or silicon (solid state relay) as a switching device 10 pieces, automatically change the tap position, so as to achieve the output voltage stabilization.
The advantages of this type of regulator is a simple circuit, wide range of voltage regulation (130V-280V), high efficiency (≥ 95%), low price. The disadvantage is that the voltage regulator precision is low (± 8 ~ 10%) short working life, it is suitable for the family to the air conditioner power supply.
High-power compensated - purified voltage regulator (including precision regulator)
It uses the compensation link to achieve output voltage stabilization, easy to realize the microcomputer control fuse (converter, resettablefuse).
It has the advantages of good anti-interference performance, high precision voltage stabilization (≤ ± 1%), fast response (40 ~ 60ms), simple circuit, reliable. Disadvantages are: with computers, programmable switches and other non-linear loads with low-frequency oscillation phenomenon; input side current distortion is large, the source power factor is low; the output voltage on the input voltage has a phase shift. Higher requirements for anti-interference function of the unit, it is appropriate to apply in the city, the computer power supply, you must choose the total power of the computer about 2-3 times the voltage regulator to use. Because it has the advantages of voltage stabilization, anti-interference, fast response speed, moderate price, so it is widely used.
Switching AC voltage regulator current transmitter, pressure gauge
It is applied to high-frequency pulse-width modulation technology, the difference between the general switching power supply is that its output must be the same as the input side of the upper frequency, the same phase of the AC voltage. Its output voltage waveforms are quasi-square wave, trapezoidal wave, sinusoidal wave, etc., the market of uninterruptible power supply (UPS) pumped out of the storage power supply and charger, it is a switching AC regulated power supply voltage regulator is good, strong control functions, easy to realize the intelligent, is very promising AC regulated power supply. But because of its complex circuitry, higher prices, so the promotion of slower.
2, DC stabilized power supply types and selection:
DC stabilized power supply can be divided into chemical power supply, linear stabilized power supply and switching type stabilized power supply according to the habit, they have a variety of different types:
Chemical power supply
We usually use dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride, lithium-ion batteries belong to this category, each with its advantages and disadvantages. Its advantages and disadvantages. With the development of science and technology, and produced intelligent batteries; in the rechargeable battery materials, the United States researchers found that a manganese iodide, with which you can create a cheap, compact, long discharge time, many times after charging still maintains the performance of a good environmentally friendly rechargeable batteries Hall sensor hallsensor.
Linear stabilization of power supply
Linear stabilization of power supply has an *** same characteristic is that its power device adjustment tube working in the linear region, relying on the voltage drop between the adjustment tube to stabilize the output. Because the adjustment tube static loss is large, need to install a very large heat sink to give it heat dissipation. And because the transformer works on the frequency (50Hz), so the weight is larger.
The advantages of this type of power supply is high stability, small ripple, high reliability, easy to make multiple, continuously adjustable output finished product. Disadvantages are large, bulky, relatively low efficiency. This type of stabilized power supply and there are many kinds of output properties can be divided into voltage stabilized power supply and current stabilized power supply and voltage stabilized and current stabilized in one of the stabilized voltage and current stabilized (double stabilized) power supply. From the output value can be divided into fixed-point output power supply, band switch adjustable and potentiometer continuously adjustable type. From the output indication can be divided into pointer indication type and digital display type and so on.
Switching DC regulated power supply
With linear regulated power supply is a different class of regulated power is switching DC regulated power supply, its circuit type mainly has a single-ended flyback, single-ended positive excitation, half-bridge, push-pull and full-bridge. The fundamental difference between it and the linear power supply is that it transformer does not work at the frequency but works in tens of kilohertz to several megahertz. Function tube is not working in the saturation and cut-off region that is the switching state; switching power supply is therefore named.
Switching power supply has the advantages of small size, light weight, stability and reliability; shortcomings relative to the linear power supply ripple is large (generally ≤ 1% VO (P-P), good can be done more than ten mV (P-P) or less). Its power can be from a few watts - a few kilowatts are products. Price of 3 yuan - more than 100,000 yuan / watt, the following general customary classification of several switching power supply:
①, AC / DC power supply
This type of power supply is also known as the primary power supply, it is from the grid to obtain the energy, after the high-voltage rectifier and filtering to get a DC high-voltage DC/DC converter for DC/DC converter in the output to obtain a stable DC voltage or several! The power ranges from a few watts to several kilowatts, which are used in different occasions. The specifications of such products are numerous, according to the user's needs depending on the communication power supply in the primary power supply (AC220 input, DC48V or 24V output) also belongs to this category.
②, DC / DC power
In the communication system, also known as the secondary power supply, it is the primary power supply or DC battery pack to provide a DC input voltage, the DC / DC converter in the output side of the output side of the one or more DC voltage.
③, communication power supply
Communication power supply is in essence a DC/DC converter type power supply, but it is generally DC-48V or -24V power supply, and use the backup battery as a backup for the DC power supply, DC power supply voltage converted to the circuit voltage, generally it is divided into the central power supply, Generally, it is divided into central power supply, layered power supply and single-board power supply three kinds, the latter has the highest reliability.
4, radio power supply
Radio power input AC220V/110V, output DC13.8V, power by the power of the radio station, a few amps hundreds of amps have products. In order to prevent the AC power grid power outage affects the radio work, and the need for a battery pack as a backup, so this type of power supply in addition to the output of a 13.8V DC voltage, but also has a battery charging automatic conversion function.
⑤, modular power supply
With the rapid development of science and technology, the reliability of the power supply, capacity/volume ratio is increasingly high, the modular power supply is increasingly showing its superiority, it is a high operating frequency, small size, high reliability, easy to install and combination of expansion, so it is more and more widely used. At present, there are corresponding domestic module production, but because the production process failed to catch up with the international level, the failure rate is high.
DC/DC module power supply at present, although the cost is higher, but from the product of the long application cycle of the overall cost of view, especially due to system failure caused by the high cost of maintenance and loss of goodwill to see, the choice of the power supply module is still cost-effective and cost-effective, it is also worth mentioning that the Roche converter circuit, which has the outstanding advantages of a simple circuit structure, high efficiency and the output voltage, current Ripple value is close to zero Shanghai Sanguang set up a wholly owned subsidiary, Sanguang Jing Rui, mainly engaged in the maintenance of industrial equipment: circuit board repair, inverter repair, PLC repair, power supply repair has been the maintenance of medical equipment Toshiba CT repair, DR repair and X-ray machine repair, Shanghai Sanguang science and technology distribution of imported currentsensor, accurrentsensor, currentswitch currentswitch, accurrentswitch and current sensing switch currentsensingswitch, accurrentsensingswitch.
6, special power supply
High voltage small current power supply, high current power supply, 400Hz input AC/DC power supply, etc., can be categorized as this type, can be categorized as this type, can be categorized as this type. etc., can be categorized in this category and can be selected according to special needs. The price of switching power supply is generally in the 2-8 yuan / watt special small power and high power power supply prices are slightly higher, up to 11-13 yuan / watt.