Ultrasonic cleaning equipment uses ultrasonic wave to clean the workpiece, so that the particles and oil stains attached to the workpiece fall off or dissolve or emulsify with the mechanical vibration of ultrasonic wave, so as to achieve the purpose of cleaning the workpiece. In principle, the core part of ultrasonic cleaning equipment should be the function of ultrasonic.

超聲波清洗設備中的超聲波部分分為兩大部件；一個是超聲波換能器{或稱超聲波振頭)；另一個是超聲波發生器，超聲波換能器是將超聲波發生器提供的電信號轉換為機械振動．這篇文章只討論超聲波發生器，不對超聲波換能器作討論．

The ultrasonic part of ultrasonic cleaning equipment is divided into two parts; One is ultrasonic transducer {or ultrasonic vibrator); The other is the ultrasonic generator. The ultrasonic transducer converts the electrical signal provided by the ultrasonic generator into mechanical vibration. This article only discusses the ultrasonic generator, not the ultrasonic transducer

超聲波發生器(以下簡稱發生器)實質是一個功率信號發生器，它產生一定頻率的正弦(或類似正弦)信號，超聲波發生器的發展與電力電子器件發展密切相關，一般可分為電子管、模擬式晶體管．開關式晶體管這幾個階段，下面分別敘述。

The essence of ultrasonic generator (hereinafter referred to as generator) is a power signal generator, which generates sinusoidal (or similar sinusoidal) signals with a certain frequency. The development of ultrasonic generator is closely related to the development of power electronic devices. Generally, it can be divided into electron tube, analog crystal tube and switching transistor, which are described below.

超聲波清洗設備的原理:

Principle of ultrasonic cleaning equipment:

由信號發生器來產生一個特定頻率的信號，這個信號可以是正弦信號，也可以是脈沖信號，這個特定頻率就是換能器的頻率，一般在超聲波設備中使用到的超聲波頻率為25KHz、28KHz、35KHz、40KHz；1OOKHz或以上現在尚未大量使用．但隨著以后精 密清洗的不斷發展。相信使用面會逐步擴大．

Firstly, the signal generator generates a signal with a specific frequency, which can be sinusoidal signal or pulse signal. This specific frequency is the frequency of the transducer. Generally, the ultrasonic frequencies used in ultrasonic equipment are 25kHz, 28kHz, 35kHz and 40KHz; 1ookhz or above has not been widely used yet, but with the continuous development of precision cleaning in the future. It is believed that the application area will gradually expand

功率放大器可有多種形式，如電子管甲類放大器．甲乙類放大器；晶體管甲類或乙類放大器（均屬于模擬式)：晶體管開關式放大器等，功率一般從50W到5000W不等，由信號發生器產生的頻率信號經過功率放大器后需經過阻抗匹配，使得輸出的阻抗與換能器相符，推動換能器將電信號轉換為機械振動．

There are many forms of power amplifier, such as class a amplifier of electron tube, class a amplifier and class B amplifier; Transistor class A or class B amplifier (both belong to analog type): transistor switching amplifier, etc. the power generally ranges from 50W to 5000W. The frequency signal generated by the signal generator needs impedance matching after passing through the power amplifier to make the output impedance consistent with the transducer, and promote the transducer to convert the electrical signal into mechanical vibration

比較完善的超聲波發生器還應有反饋環節，主要提供二個方面的反饋信號：一個是提供輸出功率信號，我們知道當發生器的供電電源（電壓）發生變化時．發生器的輸出功率也會發生變化，這時反映在換能器上就是機械振動忽大忽小，導致清洗效果不穩定．因此需要穩定輸出功率，通過功率反饋信號相應調整功率放大器，使得功率放大穩定。

A relatively perfect ultrasonic generator should also have a feedback link, which mainly provides feedback signals in two aspects: one is to provide output power signal. We know that when the power supply (voltage) of the generator changes, the output power of the generator will also change. At this time, it is reflected in the mechanical vibration of the transducer, Therefore, it is necessary to stabilize the output power and adjust the power amplifier accordingly through the power feedback signal to stabilize the power amplification.