The terminology "modified sine wave" has come into use and refers to an output waveform that is a useful rough approximation of a sine wave for power translation purposes.
The waveform in commercially available modified-sine-wave inverters is a square wave with a pause before the polarity transition, which only needs to cycle through a three-position switch that outputs forward, off, and reverse output at the pre-determined frequency. The peak voltage to RMS voltage do not maintain the same relationship as for a sine wave. The DC bus voltage may be actively regulated or the "on" and "off" times can be modified to maintain the same RMS value output up to the DC bus voltage to compensate for DC bus voltage variation.
The ratio of on to off time can be adjusted to vary the RMS voltage while maintaining a constant frequency with a technique called PWM. Harmonic spectrum in the output depends on the width of the pulses and the modulation frequency. When operating induction motors, voltage harmonics is not of great concern, however harmonic distortion in the current waveform introduces additional heating, and can produce pulsating torques.
Numerous electric equipment will operate quite well on modified sine wave power inverter devices, especially any load that is resistive in nature such as a traditional incandescent light bulb.
Most AC motors will run on MSW inverters with an efficiency reduction of about 20% due to the harmonic content.
MOST COMMON PRODUCT FEATURES OF MODIFIED SINE WAVE INVERTER:
12V/24V/48VDC to 100-120V/220-240VAC, you can power for your electric appliances which rated power less continuously. The optional USB output port offer one more choise for user. It can charge for some digital equipments as you want.
·Compact case design, slim and high efficiency
·It designed to give you quality power ,ease of use, and reliability
·Low battery alarm : alerts you if the battery has become dicharged to 11Volts or lower.
· Low battery voltage shutdown : shuts the inverter down automatically if the battery voltage drops below 10.5volts. it protects the battery from being completely discharged.
·High battery voltage shutdown : shuts the inverter down automatically if the input voltage rises to 15volts or more.
·Overload shutdown: shuts the inverter down automatically if a short cicuit is detected in the circuity connected to the inverter’s output, or if the loads connected to the inverter exceed the inverter’s operating limits
· Over temperature shutdown : shuts the inverter down automatically if its internal temperature rises above an unacceptable level.
·The modified sine wave output waveform suitable for many electronic loads.
Protection Function :
·Low voltage alarm & Shutdown
·Over voltage protection
·Overload protection
·Over temperature protection
·Short circuit protection
·Reverse Polarity protection
·Soft start
·Auto.reset after being in protected
·Earth leakage protection
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