Dongguan Hope Electronic Co.,Ltd
Dongguan Hope Electronic Co.,Ltd
Tel: 0769-81337991
E-mail: hope08@dghope.com.cn
Address: East Shadun, Xiansha Industrial Avenue, Xiansha Village, Gaobu Town, Dongguan City
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AC/DC switching power supply is one type of power supply. This type of power supply is also called a primary power supply-AC is alternating current, DC is direct current. After high voltage rectification and filtering, a direct current high voltage is obtained for the DC/DC converter to obtain one or several stable direct current voltages at the output. Watt-several kilowatts are available for different occasions. There are many specifications and models of this type of product, and the primary power supply (AC220 input, DC48V or 24V output) in the communication power supply according to user needs also belongs to this category.
Power supply efficiency is closely related to power supply design circuits. High-efficiency power supplies can improve the efficiency of electrical energy use, and to a certain extent can reduce the power consumption and heat generation of the power supply.
Used to calibrate the device, the voltage that can be applied to both ends of the overvoltage protector for a long time.
Rated power generally refers to the effective power that can be continuously output; that is, the maximum power that can continue to work in a normal working environment. Rated power should be the most important parameter specification for a power supply. If the rated power of the power supply cannot meet the needs of your computer, various unpredictable problems may follow.
According to the test current of the overvoltage protection device according to the standard DIN VDE 0675 part1, the device under test must be able to withstand this current 20 times.
That is, the UPS allows the range of changes in the mains voltage, because the local voltage fluctuations directly affect the operation of the UPS, especially in some areas where the power grid is relatively bad, and the voltage between the day and night is very different. If UPS needs to work 24 hours a day, in such a wide range of changes, it is vital that UPS can work. If it does not work, only the battery can be switched. In this way, the battery is not used for real power failure, and the battery life will be affected by frequent battery switching. If the battery transfer device of the UPS is a relay, the damage to the relay is particularly serious, which greatly increases the failure rate of the UPS.
The smaller the power, the smaller the heat generated by the machine, so the continuous projection time of the machine is longer. In order to use safety, the projector is generally equipped with overheating protection devices.
This indicator needs to be visually quantified and judged by professional instruments. It is mainly 220V AC that is filtered and stabilized by the switching power supply and converted into various low-voltage DC. Noise indicates the smoothness of the output DC. The filter quality is directly related to the output DC. The level of the AC component is also called the ripple coefficient. The smaller the coefficient, the better. At the same time, the capacity and quality of the filter capacitor are also related to the voltage stability when the current changes greatly.
Pay attention to the difference between the meaning of resistance. In the world of direct current (DC), the effect of objects on the current is called resistance, but in the field of alternating current (AC), in addition to resistance hindering current, capacitance and inductance also hinder current Flow, this effect is called reactance, and what we call impedance is the sum of resistance and reactance in a vector.
In high-frequency applications, it reflects the proportion of traveling waves reflected at the transition point of the protection device. Under this parameter, the degree of matching between the protection device and the surge impedance of the system can be directly measured. For data transmission systems, in order to prevent bit errors, The return loss of the system must be greater than 20dB.
The arrester must withstand the test current of the 8/20 waveform (see DIN VDE 0432/10.78 part3) without causing damage. The protector must be able to withstand such a large current twice.
Function The so-called power-off protection function, that is, the switching device can store the last channel switching command when it is working normally. When the power is cut off due to unexpected circumstances, the device will still save this command, and the device will automatically restore to the original switch status.
When the phase line of the protected line is connected to the ground directly or through an unexpected load, an approximate sine waveform is generated and its effective value is a slowly changing residual current. When the current is greater than a certain value, the protector cuts off the line.
When the protected circuit tends to be short-circuited and produces more than 5 times the rated current, the protector cuts off the circuit.
When the load of the protected line increases and more than 1.4 times the rated current is generated, the protector cuts off the line after a delay.
When the power supply voltage of the protected circuit is higher than a certain value, the protector cuts off the circuit; when the power supply voltage returns to the normal range, the protector automatically turns on.