Working of Inverter
Inverters convert DC Power into AC Power.
Inverters convert DC Power into AC Power.
- An inverter is used to produce an un-interrupted 220V AC or 110V AC (depending on the line voltage of the particular country) supply to the device connected as the load at the output socket.
- The inverter gives constant AC voltage at its output socket when the AC mains power supply is not available.
Lets look how the inverter makes this possible. To grasp the functioning of an inverter,we should consider in the following situations.
- When the AC mains power supply is available.
- when the AC mains power supply is not available.
↓ PHOTOS ↓
When the AC mains power supply is available.
- When the AC mains supply is available, the AC mains sensor senses it and the supply goes to the Relay and battery charging section of the inverter.
- AC main sensor activates a relay and this relay will directly pass the AC mains supply to the output socket.The load will by driven by the line voltage in this situation.
- Also the line voltage is given to the battery charging section where the line voltage is converted to a DC voltage(12V DC or 24V DC usually),then regulated and battery is charged using it.
- There are special circuits for sensing the battery voltage and when the battery is fully charged the charging is stopped. In some inverters there will be a trickle charging circuit which keeps the battery constantly at full charge.
When the AC mains power supply is not available.
- When the AC mains power supply is not available,an oscillator circuit inside the inverter produces a 50Hz MOS drive signal. This MOS drive signal will be amplified by the driver section and sent to the output section.MOSFETs or Transistors are used for the switching operation.
- These MOSFETs or Transistors are connected to the primary winding of the inverter transformer. When these switching devices receive the MOS drive signal from the driver circuit,they start switching between ON & OFF states at a rate of 50 Hz.
- This switching action of the MOSFETs or Transistors cause a 50Hz current to the primary of the inverter transformer. This results in a 220V AC or 110V AC (depending on the winding ratio of the inverter transformer) at the secondary or the inverter transformer.This secondary voltage is made available at the output socket of the inverter by a changeover relay.
A power inverter, or inverter, is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC).
- The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry. The inverter does not produce any power; the power is provided by the DC source.
- A power inverter can be entirely electronic or may be a combination of mechanical effects (such as a rotary apparatus) and electronic circuitry. Static inverters do not use moving parts in the conversion process.
- Power inverters are primarily used in electrical power applications where high currents and voltages are present; circuits that perform the same function for electronic signals, which usually have very low currents and voltages, are called oscillators. Circuits that perform the opposite function, converting AC to DC, are called rectifiers.