LEDストリップライト抵抗計算機
LED Strip Resistor Calculator Guide
📖 Overview
This calculator determines the optimal resistor value for LED strips based on:
- LED density (lights/meter)
- 入力電圧 (DC12V/24V)
- Power consumption (W/m)
- Forward voltage (Vf) per LED
📝 Step-by-Step Guide
1
Enter Parameters
- LEDs/m: Total LEDs per meter (e.g., 60, 120)
- Voltage: Select DC12V or DC24V
- 力： Power consumption per meter
- Vf: Forward voltage (Default: 3.0V)
2
Click Calculate
The tool will automatically:
- Verify input validity
- Calculate circuit groups
- Determine current requirements
- Compute resistor values
⚡ How It Works
Core Calculation Logic
1.1。 Group Formation:
12V: 3 LEDs + 1 resistor per group
24V: 6 LEDs + 1 resistor (base) or 2 resistors (alternative)
2.2。 Current Calculation:
Igroup = (Power / Voltage) / Groups
3.3。 Resistor Voltage:
Vresistor = Vinput - (LEDsper group × Vf)
4.4。 Resistance Value:
R = Vresistor / Igroup
🔧 24V Configuration Options
| Configuration | Resistors | Calculation | Benefits |
|---|---|---|---|
| Standard | 1 resistor | R = Calculated value | Simpler layout |
| Alternative | 2 resistors | Reach = Rtotal / 2 | Better heat distribution |
⚠ Important Notes
- Actual Vf varies with current (±5% tolerance recommended）。
- Always verify with physical measurements
- Resistor power rating should exceed calculated value
- For production solutions: [email protected]
🔍 Technical Validation
The calculator implements:
Ohm's Law: V = I × R
Power Law: P = V × I
LED Grouping: Optimized for voltage matching