How does the Inverter compressor work?

An inverter compressor has the composition of a gas compressor. Nowadays, consumers are going gaga over inverter air conditioners and refrigerators. Indeed it has some potential benefits, as comes with alternative power supply technology.

Moreover, power fluctuation can also damage the internal mechanism of these gadgets. So, an inverter is like a darling to protect the interest of the consumers and the electric devices. Apart from the functional value, it also safeguards the lifespan of home appliances.

Have you wondered how this system works? How does an inverter compressor produce power? In this article, I will cover these points and add more insight into your technical knowledge.

Understanding inverter circuit

Let’s start off this discussion with an explanation of the mechanism in detail. The primary role of the inverter device is to control the voltage and frequency of power. In addition, the inverter seamlessly transforms the rotation speed of the motors of the machines.

Likewise, it’s converter circuit alternates AC (Alternating Current) to DC (Direct Current). In turn, the course works to convert DC back to alternation current. It is a continuous cycle that works as a set.


Firstly, through a process of rectification, the circuit continuously converts alternative current. The magnitude of the power supply direction changes periodically. 

Here, a semiconductor device is installed to transfer the electricity in a forward direction. Interestingly, it also monitors the process that should end up in a reverse direction.

Since direct current moves through the diode, a positive peak generates. Here comes a twist, where it all passes the negative peak in the forward direction. The entire mechanism is referred to as full-wave rectification. However, this is not an automated process. The presence of a capacitor helps to generate the waveform.


Then the inverter circuit takes the helm to create alternating current with different voltages and frequencies. This switching of power conversion is operated through transistors (IGBT). Finally, a pseudo sine wave is produced and controlled automatically. This wave passes through varying frequencies and creates a parameter for the rotation speed of the motor.

Varied inverter circuits by voltage and frequency

Nowadays, progressive electrical brands integrate inverter technology into electrical products. Be it an induction cooker or an elevator, the usage of an inverter holds a colossal value in today’s market. Therefore, it has become a crucial aspect of our lives.

However, the inverter has distinct qualities and voltage frequency. Hence, one can’t expect a light compressor can work for a pump or an elevator. Based on its frequency and voltage capacity, the usage also differs.

TypeElements to change Usages
VVVFVoltage/frequencyIndustrial machines, refrigerators, pumps, heater, air condition, etc. 
CVVFFrequency Induction cooker, rice cooker, lights, fans, etc.
CVCFContinuous voltage and frequencyUSP, computers, low power supply appliances. 

VVVF: In the first case, devices like domestic air conditioners, fridges, and pumps can adjust the rotation speed of the motor. In fact, the inverter circuit can control the mechanism, as discussed above. In such instances, it is ideal to install a Variable Voltage Variable Frequency (VVVF) inverter.

CVVF: In contrast, an induction cooker doesn’t have an automated motor or a light. However, changing the frequency of the circuit helps to adjust the brightness and heat. Hence, the frequency of power plays a pivotal role here.

 To control and adjust the heat and brightness of the appliances, low power consumption is fine. Therefore, a Constant Voltage Variable Frequency (CVVF) inverter is installed here.

CVCF: Finally, as the name suggests, Constant Voltage Constant Frequency maintains continuous voltage and frequency. Hence, it is ideal for a device like a computer. A stable power supply is essential, and power fluctuation can damage the internal mechanism.  

Varied modulating technologies

Inverter compressor is a gas compressor. It is the inverter that operates the compressor. To modulate the cooling capacity, there are distinctive systems that run the show. Each of these systems possesses a few advantages and disadvantages.

Let’s understand modulating technologies in brief:

On-off cycling

If the compressor is in light load and the power goes off, it might affect the compressor’s self-life. Pressure cycling and transient loss reduce the efficiency of the unit.

Hot gas bypass

Thanks to the hot gas bypass, as it protects the compressor with adequate cooling capacity. The turndown capacity of the system ranges from 0% to 100%.

Manifold configuration

For high cooling capacity, a few compressors are integrated. In addition, all these mechanisms contribute to maintaining the cooling system of the unit.

Mechanically modulated compressor

The key ingredient of this compressor is the periodic compression process. In spite of having an incredible turnaround ratio, it has a high energy compression motor. In fact, the motor runs continuously to generate energy in the system.

Inverter compressor

It uses a variable frequency drive to control the speed. The flow rate of power keeps changing based on the speed of the compressor. Moreover, the turnaround ratio is completely dependent on the internal configuration.

Inverter Compressor Voltage

Inverter works using AC voltage. Generally, 85 – 260 VAC, 50 / 60 Hz voltage rating will be used for the majority of inverters.

However, this AC voltage will be converted into DC power within the DC bus of the inverter. This DC power will power the compressor.

So, on the other hand, you can say that your inverter compressor works under DC power.

If you want to convert your inverter from AC to DC, then you can remove the AC power section and directly supply the relevant DC power needs to the compressor.

Frequently Asked Questions

What is the difference between an inverter compressor and a normal compressor?

  • In terms of electricity consumption, the inverter compressor utilizes less power. As a normal compressor needs more power to start the motor, it increases the power consumption rate.
  • If you are concerned about durability, there is no better choice than an inverter compressor. In general, a normal compressor is more prone to damage during a low electric supply.
  • Subsequently, as an inverter compressor continuously generates power. Hence, keeps the motor engaging. 
  • It also helps to enhance the utility value of the electronic product. However, frequent fluctuations of power might endanger the function of the motor.

Is inverter compressor AC or DC?

The inverter compressor converts the incoming alternating current (AC) to direct current (DC) and utilizes a technical modulation to regulate the current’s frequency. This controlled frequency is then used to power the motor.

How do you test an inverter compressor?

ohm reading of the inverter compressor helps you to test the inverter compressor. You need to follow these simple methods:

  • First of all, you need to disconnect the compressor and check the windings.
  • With an insulation tester, you should check the winding passes against the floor.
  • If the compressor passes through the electric testing, finally, you can test it mechanically.

What is the advantage of an inverter compressor?

An inverter compressor is always an advantageous choice. It enhances the functional capacity of electrical devices. Moreover, if you buy a product having an inverter compressor, it is likely to last for a longer time.

To Wrap Up

The circuit of an inverter compressor is typically intricate. Moreover, its automated power generation and frequency control system is suitable for electrical products. If you spend a few more bucks on an inverter compressor, you are likely to be blessed with a more durable product.

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