太阳能板选型计算器
根据用电需求计算所需太阳能板的功率和数量。
V
%
Ω
Average Voltage
9.00 V
Average Power10.80 W
Peak Current1.200 A
Average Voltage vs PWM Amplitude
公式
## PWM Duty Cycle ### Formulas **V_avg = V_amplitude x D** **P_avg = V^2 x D / R** Where D is the duty cycle (0 to 1). PWM is used for motor speed control, LED dimming, and switching power supplies.
计算示例
12 V PWM at 75% duty cycle driving a 10 ohm load.
- 01D = 75 / 100 = 0.75
- 02V_avg = 12 x 0.75 = 9 V
- 03P_avg = 144 x 0.75 / 10 = 10.8 W
- 04Peak current = 12 / 10 = 1.2 A
常见问题
What frequency should I use?
Depends on application. Motors: 1-20 kHz. LEDs: above 200 Hz to avoid flicker. Switching regulators: 100 kHz to several MHz.
Is average voltage the same as DC?
For resistive loads with filtering, yes. Without filtering the load sees pulsed voltage.
How does PWM save power vs. linear?
The switch is either fully on or off, so it dissipates minimal power compared to a linear regulator which drops voltage as heat.
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