DC power concept:A device such as a dry battery, a battery, a direct current generator, etc., such as dry batteries, batteries, and DC generators, etc.
The DC power supply has a positive and negative two electrodes, the potential of the positive electrode is high, the potential of the negative electrode is low; after the two electrodes are connected to the circuit, the DC power supply can maintain a constant potential difference between the two electrodes, thereby forming a positive electrode to the negative electrode in the external circuit. Constant current.
To keep the potential difference between the DC power supply two poles, it is necessary to cause a positive charge from the outside circuit to the negative electrode in the outer circuit, and the negative electrode is returned to the positive electrode. This process does not rely on static power, and can only be implemented by "non-static power" opposite to the still in the direction. Therefore, the power supply is a device that provides non-static power, and the non-electrical energy is converted into a positive and negative electrode by non-static power.
There are two important physical quantities to characterize the power supply characteristics: one is the power electrical force E, the other is the internal resistance of the power supply (referred to as internal resistance) R0.
A lot of DC power supplies, different types of DC power supplies, different nature of non-stationary power, and the process of energy conversion is different. For example, in a chemical battery, the non-stationary power is from the chemical effect associated with the dissolution and deposition process of ions, and the chemical battery is discharged, and the chemical energy is converted into internal energy of electrical energy and circuit. In DC generators, unstatic power comes from electromagnetic induction, and when the DC generator is powered, mechanical can be converted into internal energy in electrical energy and circuitry.
Classification of DC power supply:
DC stable power supply can be divided into chemical power supplies, linearly stable power and switch type stable power supply, and each of them have various types:
Chemical power supply:
The dry batteries, lead-acid batteries, nickel-cadmium, nickel-hydrogen, and lithium-ion batteries, which have their excellent disadvantages.
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Linear stable power supply:
A linear stable power supply has a common feature that its power device adjustment tube works in the linear zone, and the voltage between the adjustment tubes is stabilized. Due to the static loss of the tube, a large heat sink is required to heat it. Moreover, since the transformer operates on the power frequency (50 Hz), the weight is large.
The advantages of this type of power supply are high stability, small ripple, high reliability, easy to make multiple channels, and output continuously adjustable. The disadvantage is that the volume is large, the more cumbers, the efficiency is relatively low. There are many kinds of stable power supplies, which can be divided into voltage regulatory power and stabilizing stabilization (double steady) power supply from the output nature. From the output value to the output power supply, the band switch adjustment and the potentiometer continuously can be adjusted. The pointer indicator and digital display formula or the like can be separated from the output instruction.
Switch-type DC voltage regulator power supply:
A class of stable power supplies with linear regulator power is a switch-type DC voltage regulator power supply, and its circuit type mainly has single-ended anti-excitement, single-ended translucent, half-bridge type, push-pull and full bridge. It and the fundamental difference between the linear power is that the transformer does not work in the power frequency but works in dozens kilohertz to several megab. The function tube is not working in a saturation and cut-off zone, the switching state; the switching power supply is therefore named.
The advantages of the switching power supply are small, light, stable and reliable; the disadvantage is larger than linear power supply (generally ≤1% Vo (PP), good to do more than ten MV (PP) or smaller) . Its power can be available from a few tiles - thousands of tiles. The price is 3 yuan - more than ten thousand yuan / watt, the following is averaged several switching power supplies on general habits:
1, AC / DC power supply
This type of power is also called a power source. Its self-grid acquires energy, obtains a DC high pressure through high pressure stream filtering, and the DC / DC converter obtains one or several stable DC voltage at the output, power from a few tiles - a few kilowatts There are products for different occasions. There are many specifications of such products, according to user needs, the primary power supply in the communication power supply (AC220 input, DC48V or 24V output) is also this class.
2, DC / DC power supply also referred to in the communication system, which provides a DC input voltage by a power supply or DC battery group, and after the DC / DC transform, one or several DC voltages are obtained at the output.
3, communication power
Communication power supply is essentially DC / DC converter power supply, but it is generally powered by DC-48V or -24V, and uses backups powered by the backup battery, convert the power supply voltage of the DC to the working voltage of the circuit, which is generally Three of central power supply, hierarchical power supply and single board power supply, the latter reliability is the highest.
4, radio power
Radio power input AC220V / 110V, output DC13.8V, power is set by the power station, and several hundreds of power have a product. To prevent AC grids from breaking the movie on the station, there is a battery pack as backup, so this The class power supply removes an 13.8V DC voltage and has the automatic conversion function of the battery.
5, module power
With the rapid development of science and technology, the power supply reliability, capacity / volume ratio is getting higher and higher, the module power supply is increasingly displayed, its operating frequency is high, small size, high reliability, easy to install and combine expansion, So getting widespread useful. At present, although there is a corresponding module production in China, it is not possible to catch the international level due to the production process.
DC / DC module power supply currently has higher cost, but from the overall cost of the product's long application cycle, especially due to system failure, the power module is still in cost Co-accounts, it is also worth mentioning that the Roche converter circuit is that the protruding advantage is that the circuit structure is simple, efficient and output voltage, and the ripple value of the current is close to zero.
Article from: http://www.brcpower.com/ Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
