Home truly energy-efficient LED lighting products, ultimately to have a dimming feature, Europe and the United States and other high-end market demand in other countries and markets in the future will be the gradual popularization. The latest technology in LED dimming PWM, by a different pulse width of the PWM signal to control the ratio of the power device is switched on and off, thereby to adjust the output luminous flux. Compared to other dimming and PWM dimming without changing the LED current flowing through the size, the lamps will not cast, but also to avoid the loss of resistance dimming energy, maintaining the high efficiency of high power led bicycle lights.
Tektronix AFG3000 any, waveform generator can easily generate a PWM signal, the user can change the PWM changes the form of the output pulse width ratio and variation, all the operation only on the panel pressed a button, the impedance of the generator built-in the adjustment function can be adapted to the circuit needs.
Ripple is added to the AC voltage on the DC output voltage, the led high bay power supply testing is an important measurement parameters. Ripple current increases, power costs are lower, but the light output would be affected, and will improve the LED junction temperature and thus affect the LED performance, or even seriously reduce the life of the high power led bicycle lights (experience has shown, the junction temperature is increased by 10 ℃ life is shortened by half). Therefore, accurate measurement of the ripple is very important. Tektronix oscilloscope power test program has a ripple measurement can be a key to complete the ripple parameters were measured. For high-end applications, the Tektronix TCPXX Series current probes are available as low as 1mA of ripple current measurement accuracy, cost-effective probe for selection for cost-sensitive applications.