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The DC Inverter AC technology is the most recent advancement of innovation concerning the electromotors of the blowers. An Inverter is utilized to control the speed of the blower motor, in order to ceaselessly manage the temperature.

The DC inverter units have a variable frequency drive that involves a flexible electrical inverter to control the speed of the electromotor, which implies the compressor and the cooling/warming output. The drive changes over the approaching AC current to DC and after that through a regulation in an electrical inverter produces the current of the desired frequency.

A microcontroller can test each surrounding air temperature and alter as needs be the speed of the blower. The inverter cooling units have expanded effectiveness in contraction to conventional ventilation systems, broadened life of their parts and the sharp fluctuations in the load are killed. This makes the inverter AC units calmer, with bringing down working expense and with less broke downs.

The inverter AC units may be costlier than the consistent speed ACs, yet this is adjusted by bringing down electricity bills. The payback time is around two years relying upon the utilization.

Inverter AC Technology

Figure 1: Inverter AC Technology

DC Inverter Air Conditioner (AC) Working Principle

In the induction motor, the stator of the motor has windings that are planned such that a rotating magnetic field is created to the windings.

The rotor, for the most part, has windings that are installed inside iron laminates. As power is provided to the windings, the magnetic field is delivered in the rotor that causes it to respond with the magnetic field in the stator. The rotating magnetic field of the stator pulls the rotor around with the rotor endeavoring to stay aware of the pivoting field. The falling behind or slip is around a couple of percents.

There are no brushes and commutator in comparison with regular DC motor subsequently taking out concerns, such as sparkles, brush life, brush residue and electrical noise.

The windings of the motor are associated with the power components control that decides the speed of the motor by the utilization of small-scale controller.

Initially, The DC converter changes over the approaching power supply from AC to DC utilizing four diodes associated like a scaffold.

Inductors and capacitors are associated before the converter to decrease the electrical noise being brought into the power supply because of the exchanging of the transistors.

dc inverter ac technology

Figure 2: Single Phase Power Supply

Furthermore, being an active power converter means that the power factor correction for this design is able to correct the power factor of the equipment to more than 98% compared to the other solution based on LC (inductor and capacitor) channel. It additionally decreases the harmonic current emission to a low level which is adequate to the benchmarks being forced by the Electromagnetic Compatibility specialized board of trustees. The main misfortune with this strategy is the higher cost required for its usage.

Next, the IGBT transistors that create 3 stage voltage supply to the DC blower motor. In the initial design, the designers used six discrete IGBT transistors which are controlled by the microcomputer.

The software is designed in such a way that proper signals are being used to power ON or OFF each transistor at a proper timing depending on the feedback such as the position of the rotors in relation to the stator motor and the voltage levels detected.

The brushless DC motor of the compressor receives a 3-stage sinusoidal voltage that turns the motor ON. The speed of the motor can be controlled from low to high by shifting the power provided to the motor through the exchanging of the transistors. Along these lines, limit-controlled HVAC can be accomplished.

When cooling or warming is required promptly, the motor will turn at the most elevated speed. At the point when the temperature of the room has balanced out, the motor will turn at a lower speed.

More up to date configuration makes utilization of power modules known as IPM or Intelligent Power Modules where the 6 IGBT transistors, an identification circuit, over-burden conditions and different parameters are being worked in a capsule packaging. It appears as an integrated circuit apart from that it is especially greater in size.

Inverter Vs Non-Inverter Air Conditioner (AC)

Comparison of Inverter and Non-Inverter AC Technology

Figure 3: Comparison of Inverter and Non-Inverter AC Technology

Inverter ACs are considerably friendlier to the environment attributable to their sudden fluctuation identification capacities and programmed alterations made to the compressor speed. The sensor inserted in the inverter changes the power as indicated by the temperature in the room and thus, this profoundly modern yet creative technology helps spare energy and lower electricity consumption. (See Figure 4) On the other hand, the speed of the non-invertor compressor is settled, implying that it either works at full or low speed and nothing in the middle.
The inverter AC innovation is viewed as energy-effective. In an inverter display, the cooling and warming are mechanized in an energy effective and consistent way. (See Figure 5) Whereas, non-inverter ACs consume a great deal of power regardless of the required utilization.
The inverter AC can cool and warm your room speedier than its non-inverter partner. This is because of the way that an inverter AC unit works on a variable speed. This procedure guarantees quick ventilating impacts by means of faster variable speed enabling the compressor to keep running at full power just when required while continually controlling the temperature according to end client’s requirements and consequently saving money. Besides, non-inverter ACs compressor works at full capacity at all times, creating a burden of a large amount of bills on the customer’s shoulders.

Quietness is another component that inverter ACs offer. The open-air unit which contains the inverter blower is considerably calmer. Henceforth, you don’t get disturbed when you rest. (See Figure 6)

The compressor motor of the non-inverter keeps on turning on and off all the time which makes the operation a little noisy. It automatically turns on and off every time they reach a certain temperature.


An inverter AC gives complete control over energy utilization. In addition, it will give complete knowledge about every specialized metric, for example, watts, voltages, current and units expended. A smart AC also lets the user schedule the AC to automatically turn itself on or off. On the contrary, non-inverter AC does not provide complete control over energy utilization to the consumer.

Eco-friendlier inverter ACs

Figure 4: Eco-friendlier inverter AC power and speed v/s non-inverter ACs

Inverter AC’s energy consumption vs non-inverter AC’s Energy consumption

Figure 5: Inverter AC’s energy consumption v/s non-inverter AC’s Energy consumption

Comparison of Inverter ACs compressor with non-inverter ACs compressor in terms of noise

Figure 6: Comparison of Inverter ACs compressor with non-inverter ACs compressor in terms of noise


Considering the above-mentioned benefits of inverter technology, one would always go with the best option keeping in mind the benefits of this latest technology as to utilize his money wisely.

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About Ahmad Faizan

Mr. Ahmed Faizan Sheikh, M.Sc. (USA), Research Fellow (USA), a member of IEEE & CIGRE, is a Fulbright Alumnus and earned his Master’s Degree in Electrical and Power Engineering from Kansas State University, USA.