A kind of DC/AC converter-power frequency inverter analysis

I believe many people have heard of the power frequency inverter? So what is its function? The power frequency inverter is a DC/AC converter that is designed using high-frequency pulse width modulation technology and microcomputer control technology to convert the battery pack into The DC power is converted into AC power with stable output voltage and frequency.

introduce:

It has high conversion efficiency (up to more than 80% at full load). At the same time, it also has strong non-linear load driving capability. The inverter power supply can also detect and monitor the input voltage, current and output voltage and current, thereby realizing the function of unattended maintenance. Power frequency inverters have many application fields, such as using inverters in the aviation industry to provide an on-site 400Hz frequency conversion, etc. Generally speaking, the input voltage is changed according to the needs of the actual application, which requires the use of an inverter.

We will focus on the following inverter application areas for introduction:

1. Industrial process control and applications such as switching equipment, program logic control

2. Telecommunications industry hub and wireless applications and other occasions

3. Data center and computer room

4. Emerging energy industries such as solar energy, wind power, fuel cells, etc.

Different areas use different DC voltage inputs. For example:

·24VDC suitable for telecommunications, navigation industry, solar energy...

·48VDC and 60VDC are suitable for telecommunications fixed and mobile networks, IT industry...

·110VDC and 220VDC suitable for industry, electric power, railway...

We divide inverters into two product ranges and two technologies:

1. Independent rack or single inverter, application range from hundreds of VA to 60KVA (single phase or three phase)

In this field we can see two technologies - SCR/GTO technology and switch mode PWM technology applied in new products:

SCR/GTO technology used in high power systems > 3 to 5kVA

PWM technology is used in small inverters 2 or 3 kVA

2. The concept of parallel power frequency inverter using switch mode PWM technology

The new generation of products uses PWM technology and various topologies from different manufacturers

Paralleling means communication or control between modules, which allows:

·Realize true load sharing between inverter modules

·Keep the synchronization of each parallel module and maintain the stability of output voltage value and frequency

Application areas:

It can be used on imported electrical and electrical equipment that requires AC110V, such as ships, heavy trucks, industrial equipment, air conditioners, televisions, cash registers, refrigerators, washing machines, computers, and power tools.

characteristic:

1High load capacity

2. Quiet and efficient operation

3. Front panel LED indicator and adjustable switch selector

4. Optional lead-acid battery, gel battery, or fiberglass separator (AGM) battery

5. Three-stage charging (high current charging, absorption, and float charging) to improve performance

6.70A automatic 3-stage battery charger

7 Quick switch (grid to battery and battery grid) backup power

8. Lower idle current (less than 1 watt) can be consistent with the engine, saving energy when there is no load.

9. Protection circuit for low battery, overload, too high battery, and excessive temperature

10. Long-lasting life under extreme environmental conditions

11. High overload capacity can bear relatively large loads, and can handle circuit boards stably under overload conditions. The coating can protect them from corrosion and improve service life and load reliability.

12. Durable powder coating, corrosion-resistant steel chassis, waterproof

Precautions:

1) The UPS usage environment should be well ventilated to facilitate heat dissipation and keep the environment clean.

2) Do not carry inductive loads, such as money counters, fluorescent lamps, air conditioners, etc. to avoid damage.

3) It is best to control the output load of the UPS at about 60% for high reliability.

4) UPS with too light load (such as 1000VA UPS with 100VA load) may cause deep discharge of the battery, which will reduce the service life of the battery and should be avoided as much as possible.

5) Appropriate discharge will help activate the battery. If the mains power is not cut off for a long time, the mains power should be artificially cut off and the UPS should be discharged with load every three months. This can extend the service life of the battery.

6) For most small UPS, the UPS should be turned on when going to work, avoid starting with load when starting up, and turn off the UPS when leaving work; for UPS in the network computer room, since most networks work 24 hours a day, the UPS must also run around the clock.

7) The UPS should be charged promptly after being discharged to avoid battery damage due to excessive self-discharge. The above is the relevant analysis of power frequency inverter, I hope it can help you.