#Industry News
[Power amplifier example] drive coil to achieve LED light test
LED (Light Emitting Diode), a light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light.
It can directly convert electricity into light. For this kind of application, Aigtek uses the power amplifier to drive the coil to complete the LED lamp lighting test.
Test equipment:
Signal generator, power amplifier, oscilloscope, a pair of mutual inductance coils, LED lights
Experimental platform construction（Figure 1）:
Principle of inductance effect:
A signal generator is used to provide an excitation signal (sine wave) to the power amplifier. The power amplifier outputs a large current and loads it on the coil. When the current passes through the coil, a magnetic field is induced in the coil, and the induced magnetic field generates an induced current to resist passing through the coil. The current in. The interaction between this current and the coil is called electrical inductance.
When two inductance coils are close to each other, the magnetic field change of one inductance coil will affect the other inductance coil, and this effect is mutual inductance. The magnitude of the mutual inductance depends on the degree of coupling between the self-inductance of the inductance coil and the two inductance coils. The components made using this principle are called mutual inductors.
experiment procedure:
Use the signal generator to input a 67KHz, 3Vp-p sinusoidal signal, and amplify the voltage by 25 times through the ATA-3040 power amplifier, give a large current to a coil to drive, by changing the distance between the driving coil and the receiving coil, Produce inductance effect, thus produce different electric fields, control the brightness of LED lights（Figure 2）.
Experimental conclusion（Figure 3）:
The ATA-3040 power amplifier provides high current to the coil to provide high power, so that the inductance between the two coils will light up the LED lights.
The parameters of ATA-3040 are as follows:
The ATA-3040 is an ideal power amplifierfor both AC and DC signals. The maximum output power is 360Wp, which can drive the power load. Gain number adjustable, commonly set to save with one key. For you to provide convenient, simple operation options. It can be used with the main stream signal generator to achieve the ideal signal amplification effect.
Maximum output voltage: 90Vp-p (±45Vp)
Maximum output current: 8Ap
Bandwidth (-3dB): DC~100kHz
Slew rate: 30V/μs
