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Low Frequency Power Inverter Inverter Device Jun 12, 2017

Low Frequency Power Inverter Inverter device

Power inverter (car power supply) is a DC12V DC can be converted to the same power and AC220V AC power, for general electrical use, is a convenient power converter.

Inverter, must be a kind of inverter device can be so called, he and the transformer has a direct difference, that is, he can achieve DC input, and then output AC, the same working principle and switching power supply, but the oscillation frequency in the Within a certain range, such as if the frequency of 50HZ, the output was AC 50HZ. The inverter is a device that can change its frequency.

How to choose the correct ups power inverter mainly to focus on the following points.

1, rated output voltage: within the allowable fluctuation range of the specified input DC voltage, it indicates The inverter should be able to output the rated voltage. The stability accuracy of the output rated voltage is generally specified as follows: During steady-state operation, the voltage fluctuation range should be limited, for example, its deviation does not exceed ± 3% or ± 5% of the rated value. The output voltage deviation shall not exceed ± 8% or ± 10% of the rated value in the event of a sudden change in load or other interference factors.

2, the output voltage imbalance: Under normal operating conditions, the inverter output of the three-phase voltage imbalance (reverse order component of the positive sequence component ratio) should not exceed a specified value, generally expressed in%, such as 5 % Or 8%.

3, the output voltage waveform distortion: When the inverter output voltage is sinusoidal, should be allowed to allow the maximum waveform distortion (or harmonic content). It is usually expressed as the total waveform distortion of the output voltage and should not exceed 5% (10% for single-phase output).

4, the rated output frequency inverter output AC voltage frequency should be a relatively stable value, usually frequency 50Hz. Under normal operating conditions, the deviation should be within ± 1%.

5, the load power factor: characterization of the inverter with an inductive load or capacitive load capacity. In the case of sine wave, the load power factor is 0.7 ~ 0.9 (hysteresis), the rated value is 0.9.

6, rated output current: that in the specified load power factor range of the inverter rated output current. Some inverter products are given the rated output capacity, the unit is expressed in VA or KVA. The rated capacity of the inverter is when the output power factor is 1 (ie, pure resistive load), the rated output voltage is the product of the rated output current.

7, the rated output efficiency: the efficiency of the inverter is in the specified working conditions, the output power of the The ratio of input power, expressed in%. The efficiency of the inverter at rated output capacity is full load efficiency, and the efficiency of the rated output capacity at 10% is low load efficiency.

8, protection: over-voltage protection: no voltage stability measures for the inverter, there should be output over-voltage protection measures, so that the negative cut from the output over-voltage damage.

Overcurrent protection: the inverter over-current protection, should be able to ensure that the load occurs when the short circuit or current exceeds the allowable value in a timely manner to protect it from inrush current damage.

9, starting characteristics: characterization of the inverter with load start and dynamic performance of the work. The inverter should ensure reliable starting at rated load.

10, noise: power electronic equipment in the transformer, filter inductors, electromagnetic switches and fans and other components will produce noise. When the inverter is running normally, its noise should not exceed 80dB, the noise of the small inverter should not exceed 65dB.