12VDC TO 220VAC 300W MODIFIED SINEWAVE INVERTER BOARD BLUE(USED)
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This specification describes a high-power 300W Modified Sine Wave Inverter Board (often nicknamed the "Blue Board" due to its common PCB color). It is designed to convert low-voltage DC from a battery into high-voltage AC for household appliances.1
Core Technical Specifications
Input Voltage:12V DC (Typical range 10.5V – 15V)
Output Voltage:220V AC (Modified Sine Wave)
Continuous Power: 300W
Peak/Surge Power: Typically, 400W (to handle the "kick" when starting motors)
Frequency:50Hz or 60Hz (depending on the specific regional version)
Built-in Safety Protections
The "Blue Board" is popular because it includes active protection circuitry that prevents the board from "frying" during common user errors:
1. Overload Protection
If you connect a device that draws more than 300W (like a large drill or a hairdryer), the board detects the excessive current.
How it works: The control chip (often an SG3525 or TL494) monitors the current through a shunt resistor.
Result: The board will shut down the output to prevent the MOSFETs from melting.
2. Short Circuit Protection
If the 220V output wires accidentally touch each other, a massive spike of current occurs.
How it works: The board uses ultra-fast sensing to detect the "near-zero" resistance of a short.
Result: It kills the drive signal to the power transistors in microseconds, saving the board from a catastrophic explosion.
What is a "Modified Sine Wave"?
Unlike the smooth curve of a "Pure Sine Wave" (the power from your wall outlet), a modified sine wave uses a "stepped" square wave.
What it runs well: Lights (LED/Incandescent), laptop chargers, fans, and basic TVs.
What it may struggle with: Sensitive medical equipment, high-end audio systems (may hum), and some microwave ovens.