Faroe Islands Five solutions to non-isolated power supply(1)
2022-09-08

There are many levels of conditions that can cause  non-isolated  Marine boost voltage power supply failure:

1. The output working voltage of the  non-isolated  Marine boost voltage power supply is reduced in the whole application process;

2. The DC DC power module stops working;

3. The output voltage of  non-isolated  Marine boost voltage power supply is too high;

AC/DC Module power

4. The input of  non-isolated  Marine boost voltage power supply is short circuited;

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Ring current backup
The ring current generator is mainly used in the telephone exchange exchange to provide ringing to the telephone users, and is generally used in a biased state. Bias can be divided into positive bias and negative bias. In order to improve the reliability of the ring current system, the ring current needs to be backed up. Installation and maintenance of module power supply
Since the types, series and specifications of the modular power supplies produced by various companies are difficult to count, their functional characteristics and physical characteristics are not the same, so they are also different in installation, use and maintenance, but the following aspects should be paid attention to

5. The output current of  non-isolated  Marine boost voltage power supply is too large.

Next, let's analyze the above problems that will cause  non-isolated  Marine boost voltage power supply failure one by one:

(1) In the first two kinds of  non-isolated  Marine boost voltage power supply failures, it is usually not easy to generate a large risk, which can be checked and alarmed by the fault detection  Marine boost voltage power supply circuit;

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power source is realized through the power transfer switch.
Modern UPS generally adopts pulse width modulation technology and modern power electronic devices such as power MOSFET, IGBT, etc., the noise of power supply can be reduced, and the efficiency and reliability can be improved. The introduction of microprocessor software and hardware technology can realize intelligent management of UPS, remote maintenance and remote diagnosis.
The maximum capacity of the online UPS can be made to 600kVA. The development of ultra-small UPS is also very rapid, and there are already 0.5kVA, lVA, 2kVA, 3kVA and other products of various specifications.

(2) The third failure method is more dangerous because it can damage the operating  Marine boost voltage power supply circuit. Usually, the overvoltage protection can be built according to the overvoltage protection  Marine boost voltage power supply circuit. The other form can be realized by adding a zener diode at the output end. The preventive measure we can take is to effectively select the parameters of the diode in the design scheme to avoid the change of the zener point due to different temperatures. However, some modules have built-in overvoltage protection. Generally speaking, modules below 25W have no overvoltage protection function, and only modules above 25W are designed with overvoltage protection circuit. The overvoltage protection point of the power module in the design will generally be designed as 135% - 145% of the rated voltage. Perhaps it is necessary to determine whether the module has this function already and can prevent repeated design schemes during the detailed design;