The smooth DC power (batteries power) is inverted by two channels of MosFets (switching device) in Push-Pull/ bridge configuration. The switching device (MosFets, IGBTs or Transistors) is used and controlled by a sophisticated control circuit. A closed loop voltage feedback control is used to keep the output voltage constant even under widely varying DC voltage (Batteries) conditions and the load on Inverter. A proportional increase in the width of the pulses causes an increase in voltage and a proportional reduction in width decreases the voltage. This means the voltage control action of variable gain is normally accomplished by varying pulse width to the power.

This method of varying pulse width is known as Pulse width Modulation (PWM) controls. All models of JET Electro - Power Inverters provide regulated output voltage (PWM Controlled) on battery mode a per the load distribution voltage standard.

(a) Fast Mains Power sensing circuits: In case of power failure, a good inverter would switch to battery for backup so fast that the time of switching is not to be perceptible. As a result some appliances that required a higher start current, like the refrigerator can be driven using Inverter.

(b) Battery charger System: Battery is the life of the Inverter. An Inverter lives on battery so it is the responsibility of the Inverter to protect the battery and use it optimally and enhance its life. Inverter battery lifetime is maximized if the battery is always powered from a constant current charger. Jet Electro power Inverter gives constant charging current to batteries irrespective of the A.C Voltage i.e. Whether the AC Voltage is 150 or 270V, the battery gets nearly the same charging current. This protects the battery plates from damage and Jet Electro power Inverter has an advanced trickle charging mechanism built in the system to prevent batteries from overcharging and to increase the battery life.

(c) Inverter (DC to AC Inverter): The main part of the Inverter system, one that converts battery energy to backup power must be designed to deliver high grade power most efficiently. Jet Electro's power Inverter is designed to perform this function in the absence of power.

The power from the mains is a sinusoidal wave (Sine wave) of frequency 50Hz. Ideal backup power source would be one that generates the equivalent sine wave of the same that as that of the mains. JET Electro range of power Inverter gives power in the form of stepped Sine wave (Quasi Sine wave) voltage so that the bulbs & Tubelights glows at an optimal brightness without any humming sound.
In fact most of the times it is difficult to realize the absence of main power. Jet Electro's inverters voltage regulations in the inverter is very good. So the output voltage (on battery mode) would remain nearly constant irrespective of battery condition and load on the Inverter.

(c) Battery over charge Protections: Overcharging occurs when battery continues to get charged with high value of current after getting fully charged. Such charging corrodes the battery plates and reduce the battery life.
Hence battery-overcharging protections is necessary because if battery is getting over charged frequently, then it will reduce the life of battery. JET Electro's power Inverter models have the Battery overcharge protection.

(d) Short circuit protection: A good Inverter must also protect itself from damage. Since an Invereter is a consumer product and is connected on house wiring , chance of risk must be minimized. It must have a built-in short circuit protection, so that if any equipment connected across it were to be short circuited, the Inverter itself should not get damaged due to drawing high current.
The Jet Electro inverters come with a fuse free, Electronic short circuit protection. This would prevent damage to the Inverter as well as the other appliance attached to it.

(e) Reverse battery protection: It means when the batteries to Inverter connected in reverse (i.e. +of battery to -ve of Inverter and -ve of batteries to +ve of Inverter), The system should not damage. JET Electro's power inverters have the same protections.

(f) Frequency stability: Many appliances are by design dependent on the frequency of the Input power (normal Input Supply Frequency (50Hz +/- 5%). The output wave from the Inverter should be stable (50Hz) for proper functioning of these equipment's.
The Frequency stability of Jet Electro Inverters is achieved by PWM ( Pulse width Modulation) controller, which delivers stable high grade of power. This controller also ensures frequency stability with temperature to the tune of 2%.

(g) CCCV Battery charger: Inverter battery life time is maximized if the battery is always powered from a constant current constant voltage (CCCV) charger.
All JET Electro power Inverters is designed for the hostile Indian power conditions. The charger of Inverter is designed on the silicon controlled rectifier Technology (acknowledged as the best technology for battery charging), because of which power consumption is minimum and give constant charging current to batteries irrespective of A.C Voltage. Whether the A.C Voltage is 145 or 270V, the battery gets nearly the same charging current through the CCCV charger.

(h) High efficiency of system: The efficiency of the Inverter system is calculated by comparing the Input power with the Output power in the Inverter/Battery mode of operation. A device that has a high switching speed can only achieve maximum efficiency. MosFet is a high speed-switching device.
JET Electro's 'Mech' power Inverter design is based on MosFets. The design has an Inverter efficiency of 95% and overall efficiency of nearly 92%. This results in more backups with less stress on batteries.

The Inverter usually comprises of a power circuit which is 'switched' at a pre-determined frequency to generate a stepped wave. There are various types of devices used in the inverter power circuit. Earlier technologies used bipolar junction transistors or BJTs (1960's) and power transistor (1970s). The latest generation devices are power MOSFETs which have revolutionized the inverter technology and offer unique advantages over conventional devices.
MOSFETs are majority carrier, voltage-driven devices and their construction and principles of operation are fundamentally different from BJTs, which are minority carrier, current-driven devices.

MOSFETs offer several significant advantages over thyristors as well, which include the ability to operate at frequencies above the audible range, low output distortion, high overload capability, negligible switching and snubber circuit losses, fast response and simple drive circuitry.

Device characteristics limit the use of BJTs for high-frequency switching applications. Minority carrier delay times limit the switching speed to the 500 to 5,000 nanosecond ranges. MOSFETs on the other hand, are majority carrier devices and switch in the 20-to-100 nanosecond range. Conventional Inverter systems have an efficiency range of 60-to-80 %. MOSFET-based systems with inverter efficiency as high as 92.5%.

Losses in the inverter circuit are primarily switching losses, snubber losses and I2R losses. Use of MOSFETs practically eliminates the first two losses. Unlike BJTs MOSFETs are a majority carrier devices having no storage time effects. Switching losses are directly proportional to turn-on and turn-off times, which, for MOSFETs, are in the nanosecond range, practically eliminating switching losses. Further, in MOSFETs switching performance is essentially independent of operating temperature, unlike BJTs wherein efficiency drops as temperature increases with switching times.

Snubbers are resistive devices used in inverter power circuits to control the rate of rise of voltage caused by rapid switching. MOSFETs have a very high dv/dt rating (in the range of 1000 to 2000 volts/microsec) eliminating the need for snubbers altogether. BJTs, on the other hand , have dv/dt limited to about 200 volts/micro sec. Such turn-off times need very heavy snubbers across the devices, resulting in losses.
As a result of this increase in efficiency, for the same capacity battery, MOSFET-based inverters ensure longer backup time and lower AH batteries can be used, thereby reducing battery cost.

Three types of batteries are normally used, - Sealed maintenance Free (SMF), Tubular or automotive. The popular type are the automotive type - the type that is used in the cars and trucks, suitably modified and designed for the Inverter.

The tubular battery, that gives higher backup, longer life, more reliable and more costly. The sealed maintenance free batteries are hassle free batteries although they have limitations on backup time and more costly.

One is right when one says 'similar'. The reason is that Inverters manufactured by JET Electro uses Pulse width Modulation (PWM) technique with MosFet as basic inversion element. There is no chance of the fuse blowing during sudden load applications due to AC Mains Failure. That means assured power supply. Due to the PWM technology the size of the filter used in Inverter is also small which improves the dynamic behavior.

All the Jet Electro power Inverter have all the protection and have good features meeting the requirement of International market. We guarantee an inversion efficiency of more than 90-92%. High efficiency also results in small size. Our equipment is the smallest for a given rating, it occupies minimum floor space and can be installed easily. A very generous design impart tremendous short term overload capacity to our systems which is essential to take care of large inrush and surge currents demanded by appliances connected to the systems.