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w on circuit or device batteries edit the runtime of an inverter powered by batteries is dependent on the battery power and the amount of power being drawn from the inverter at a given time as the amount of equipment using the inverter increases the runtime will decrease in order to prolong the runtime of an inverter additional batteries can be added to the inverter 11 formula to calculate inverter battery capacity 12 battery capacity ah total load in watts usage time in hours input voltage v when attempting to add more batteries to an inverter there are two basic options for installation series configuration if the goal is to increase the overall input voltage to the inverter one can daisy chain batteries in a series configuration in a series configuration if a single battery dies the other batteries will not be able to power the load parallel configuration if the goal is to increase capacity and prolong the runtime of the inverter batteries can be connected in parallel this increases the overall ampere hour ah rating of the battery set if a single battery is discharged though the other batteries will then discharge through it this can lead to rapid discharge of the entire pack or even an overcurrent and possible fire to avoid this large paralleled batteries may be connected via diodes or intelligent monitoring with automatic switching to isolate an under voltage battery from the others applications edit dc power source usage edit an inverter converts the dc electricity from sources such as batteries or fuel cells to ac electricity the electricity can be at any required voltage in particular it can operate ac equipment designed for mains operation or rectified to produce dc at any desired voltage uninterruptible power supplies edit an uninterruptible power supply ups uses batteries and an inverter to supply ac power when mains power is not available when mains power is restored a rectifier supplies dc power to recharge the batteries electric motor speed control edit inverter circuits designed to produce a variable output voltage range are often used within motor speed controllers the dc power for the inverter section can be derived from a normal ac wall outlet or some other source control and feedback circuitry is used to adjust the final output of the inverter section which will ultimately determine the speed of the motor operating under its mechanical load motor speed control needs are numerous and include things like industrial motor driven equipment electric vehicles rail transport systems and power tools see related variable frequency drive switching states are developed for positive negative and zero voltages as per the patterns given in the switching table 1 which the generated gate pulses are given to each switch in accordance with the developed pattern and thus the output is obtained in refrigeration compressors edit an inverter can be used to control the speed of the compressor motor to drive variable refrigerant flow in a refrigeration or air conditioning system to regulate system performance such installations are known as inverter compressors traditional methods of refrigeration regulation use single speed compressors switched on and off periodically inverter equipped systems have a variable frequency drive that controls the speed of the motor and thus the compressor and cooling output the variable frequency ac from the inverter drives a brushless or induction motor the speed of which is proportional to the frequency of the ac it is fed so the compressor can be run at variable speeds eliminating compressor stop start cycles increases efficiency a microcontroller typically monitors the temperature in the space to be cooled and adjusts the speed of the compressor to maintain the desired temperature the additional electronics and system hardware add cost to the equipment but can result in substantial savings in operating costs 13 the first inverter air conditioners were released by toshiba in 1981 in japan 14 power grid edit grid tied inverters are designed to feed into the electric power distribution system 15 they transfer synchronously with the line and have as little harmonic content as possible they also need a means of detecting the presence of utility power for safety reasons so as not to continue to dangerously feed power to the grid during a power outage synchronverters are inverters that are designed to simulate a rotating generator and can be used to help stabilize grids they can be designed to react faster than normal generators to changes in grid frequency and can give conventional generators a chance to respond to very sudden changes in demand or production large inverters rated at several hundred megawatts are used to deliver power from high voltage direct current transmission systems to alternating current distribution systems solar edit internal view of a solar inverter note the many large electrolytic capacitors blue cylinders with black circles at the top used to store energy briefly and improve the output waveform overview of solar plant inverters part of a series on power engineering electric power conversion voltage converter voltage multiplier electric power conversion hvdc converter station ac to ac converter dc to dc converter rectifier inverter electric power infrastructure electric power system power station electrical grid interconnector demand response electric power systems components ring main unit grid tie inverter energy storage busbar bus duct recloser protective relay v t e main article solar inverter a solar inverter is a balance of system bos component of a photovoltaic system and can be used for both grid connected and off grid standalone systems solar inverters have special functions adapted for use with photovoltaic arrays including maximum power point tracking and anti islanding protection solar micro inverters differ from conventional inverters as an individual micro inverter is attached to each solar panel this can improve the overall efficiency of the system the output from several micro inverters is then combined and often fed to the electrical grid in other applications a conventional inverter can be combined with a battery bank maintained by a solar charge controller this combination of components is often referred to as a solar generator 16 solar inverters are also used in spacecraft photovoltaic systems induction heating edit inverters convert low frequency main ac power to higher frequency for use in induction heating to do this ac power is first rectified to provide dc power the inverter then changes the dc power to high frequency ac power due to the reduction in the number of dc sources employed the structure becomes more reliable and the output voltage has higher resolution due to an increase in the number of steps so that the reference sinusoidal voltage can be better achieved this configuration has recently become very popular in ac power supply and adjustable speed drive applications this new inverter can avoid extra clamping diodes or voltage balancing capacitors there are three kinds of level shifted modulation techniques namely phase opposition disposition pod alternative phase opposition disposition apod phase disposition pd hvdc power transmission edit with hvdc power transmission ac power is rectified and high voltage dc power is transmitted to another location at the receiving location an inverter in a hvdc converter station converts the power back into ac the inverter must be synchronized with grid frequency and phase and minimize harmonic generation electroshock weapons edit electroshock weapons and tasers have a dc ac inverter to generate several tens of thousands of v ac out of a small 9 v dc battery first the 9 v dc is converted to 400 2000 v ac with a compact high frequency transformer which is then rectified and temporarily stored in a high voltage capacitor until a pre set threshold voltage is reached when the threshold set by way of an airgap or triac is reached the capacitor dumps its entire load into a pulse transformer which then steps it up to its final output voltage of 20 60 kv a variant of the principle is also used in electronic flash and bug zappers though they rely on a capacitor based voltage multiplier to achieve their high voltage miscellaneous edit typical applications for power inverters include portable consumer devices that allow the user to connect a battery or set of batteries to the device to produce ac power to run various electrical items such as lights televisions kitchen appliances and power tools use in power generation systems such as electric utility companies or solar generating systems to convert dc power to ac power use within any larger electronic system where an engineering need exists for deriving an ac source from a dc source for example a dc powered electronic device may contain a small inverter to power an electroluminescent or fluorescent backlight which requires high frequency ac utility frequency conversion if a user in say a 50 hz country needs a 60 hz supply to power equipment that is frequency specific such as a small motor or some electronics it is possible to convert the frequency by running an inverter with a 60 hz output from a dc source such as a 12 v power supply running from the 50 hz mains circuit description edit top simple inverter circuit shown with an electromechanical switch and automatic equivalent auto switching device implemented with two transistors and split winding auto transformer in place of the mechanical switch square waveform with fundamental sine wave component 3rd harmonic and 5th harmonic basic design edit in one simple inverter circuit dc power is connected to a transformer through the center tap of the primary winding a relay switch is rapidly switched back and forth to allow current to flow back to the dc source following two alternate paths through one end of the primary winding and then the other the alternation of the direction of current in the primary winding of the transformer produces alternating current ac in the secondary circuit the electromechanical version of the switching device includes two stationary contacts and a spring supported moving contact the spring holds the movable contact against one of the stationary contacts and an electromagnet pulls the movable contact to the opposite stationary contact the current in the electromagnet is interrupted by the action of the switch so that the switch continually switches rapidly back and forth this type of electromechanical inverter switch called a vibrator or buzzer was once used in vacuum tube automobile radios a similar mechanism has been used in door bells buzzers and tattoo machines as they became available with adequate power ratings transistors and various other types of semiconductor switches have been incorporated into inverter circuit designs certain ratings especially for large systems many kilowatts use thyristors scr scrs provide large power handling capability in a semiconductor device and can readily be controlled over a variable firing range the switch in the simple inverter described above when not coupled to an output transformer produces a square voltage waveform due to its simple off and on nature as opposed to the sinusoidal waveform that is the usual waveform of an ac power supply using fourier analysis periodic waveforms are represented as the sum of an infinite series of sine waves the sine wave that has the same frequency as the original waveform is called the fundamental component the other sine waves called harmonics that are included in the series have frequencies that are integral multiples of the fundamental frequency fourier analysis can be used to calculate the total harmonic distortion thd the total harmonic distortion thd is the square root of the sum of the squares of the harmonic voltages divided by the fundamental voltage thd v 2 2 v 3 2 v 4 2 v n 2 v 1 displaystyle text thd sqrt v_ 2 2 v_ 3 2 v_ 4 2 cdots v_ n 2 over v_ 1 advanced designs edit h bridge inverter circuit with transistor switches and antiparallel diodes there are many different power circuit topologies and control strategies used in inverter designs 17 different design approaches address various issues that may be more or less important depending on the way that the inverter is intended to be used for example an electric motor in a car that is moving can turn into a source of energy and can with the right inverter topology full h bridge charge the car battery when decelerating or braking in a similar manner the right topology full h bridge can invert the roles of source and load that is if for example the voltage is higher on the ac load side by adding a solar inverter similar to a gen set but solid state energy can flow back into the dc source or battery based on the basic h bridge topology there are two different fundamental control strategies called basic frequency variable bridge converter and pwm control 18 here in the left image of h bridge circuit the top left switch is named as s1 and others are named as s2 s3 s4 in counterclockwise order for the basic frequency variable bridge converter the switches can be operated at the same frequency as the ac in the electric grid however it is the rate at which the switches open and close that determines the ac frequency when s1 and s4 are on and the other two are off the load is provided with positive voltage and vice versa we could control the on off states of the switches to adjust the ac magnitude and phase we could also control the switches to eliminate certain harmonics this includes controlling the switches to create notches or 0 state regions in the output waveform or adding the outputs of two or more converters in parallel that are phase shifted in respect to one another another method that can be used is pwm unlike the basic frequency variable bridge converter in the pwm controlling strategy only two switches s3 s4 can operate at the frequency of the ac side or at any low frequency the other two would switch much faster typically 100 khz to create square voltages of the same magnitude but for different time duration which behaves like a voltage with changing magnitude in a larger time scale these two strategies create different harmonics for the first one through fourier analysis the magnitude of harmonics would be 4 pi k k is the order of harmonics so the majority of the harmonics energy is concentrated in the lower order harmonics meanwhile for the pwm strategy the energy of the harmonics lie in higher frequencies because of the fast switching their different characteristics of harmonics leads to different thd and harmonics elimination requirements similar to thd the conception waveform quality represents the level of distortion caused by harmonics the waveform quality of ac produced directly by h bridge mentioned above would be not as good as we want the issue of waveform quality can be addressed in many ways capacitors and inductors can be...