Automative Ultrasonic Cleaner Generator Digital Display Non Toxic Submersible Immersible

Automative Ultrasonic Cleaner Generator Digital Display Non Toxic Submersible Immersible

^{Classification of ultrasonic generators:
Conventional Class A, Class B, and Class C amplifiers operate on active devices (such as transistors for discussion) as current sources. In these amplifiers, the transistor operates in the active region of the volt-ampere characteristic.}

^{The collector current is controlled by the base excitation signal and the collector voltage is part of a sine wave or sine wave. Therefore, the collector has a large current and voltage at the same time in one week of the signal. To consume a considerable amount of power, this is the main reason for the limited energy conversion efficiency of conventional amplifiers. Switch mode amplifiers have revolutionized amplifier efficiency by using active devices as on/off switches.}

^{The transistor operates in the saturation or cut-off region of the volt-ampere characteristic curve. When the transistor is energized to turn on, it enters the saturation region, and when it is turned off, it enters the cut-off region. Since the transistor saturation voltage drop is low, the collector power consumption is minimized, improving the energy conversion efficiency of the amplifier.}

^{Generally under ideal transistor conditions (saturation voltage drop is zero, saturation resistance is zero. Disconnection resistance is infinite, switching time is zero), Class D amplifiers that work in switching mode, the theoretical efficiency is 100%, the actual efficiency is up to More than 90. The usual class A amplifier is only 50% efficient and the Class B efficiency is 78.5%. It can be seen that the switch mode power amplifier has considerable practical significance in the application of power ultrasound.}

^{Most of the ultrasonic generators in actual use are b, c-type amplifiers, most of which are c-class, and some special-purpose designs are class b.}

^{Class D power amplifier
The push-pull D-type power amplifier is shown in Figure 1.35. The input excitation signal turns off the other tube when one tube is turned on, and the on-off time occupies the AC half-cycle. There are two configurations for this amplifier, one is the voltage switching amplifier, Figure 1, 35(a); the other is the current switching amplifier (Figure 1.35(b)). In the voltage switch configuration, the transistor operates as a voltage switch, the collector voltage is a square wave, and the series tuning circuit only passes the fundamental current. Therefore, the output voltage is the fundamental component of the collector voltage, and the collector current is half a sine wave. In the current switch configuration, the transistor acts as a current switch. The choke L, maintains a constant DC feed current, the collector current is a square wave, and the collector voltage is half a sine wave.}