Multi-purpose ultrasonic micro atomizer circuit diagram

微盟ME2188A33PG

Filter 18.432M

The author introduces a multi-purpose ultrasonic atomizer. The atomizer has the following features: split type, that is, the ultrasonic atomizing head is completely separated from the power source and the circuit part; portable, small in size, plug and play, and has a self-protection function; high reliability, can work around the clock; Large, with the villa's landscape bonsai can occur cloud-like dynamic; especially suitable for excessive dry environment to humidify the air, to facilitate human breathing; add a certain amount of solvent in the water to disinfect the contaminated living environment to prevent Diseases (such as the timing of life with vinegar atomization, can prevent influenza); atomizer (finished products) low price, cost-effective, want to make atomizers, only equipment and working hours are also difficult to meet the above cost.

Multipurpose ultrasonic micro atomizer circuit

First, the circuit working principle The atomizer circuit shown in Figure 1, the power supply through the transformer B (AC220V / 30W) step-down (36V) to send D1-D4 rectification and C5, C6 filter to provide operating voltage to the circuit. The nebulizer working circuit is composed of an oscillator, a transducer and a water level control circuit.
1. Oscillator and transducer, the oscillator in the circuit is a working oscillator consisting of a high-frequency piezoelectric ceramic TD (ultrasonic transducer) with an oscillation frequency of 1.65 MHz (depending on the selected TD). The transistor BG1 and the capacitors C1, C2 and the like constitute a capacitor three-point oscillator circuit. The resonant frequency of C1 and inductor L1 is parallel and lower than the operating frequency. The function is to determine the oscillation amplitude of the working oscillator. The equivalent resonant frequency of C2 and inductor L2 is higher than the operating frequency. The function is to determine the feedback of the working oscillator. Amount to ensure oscillator oscillation and maintain reliable oscillation of the circuit. Piezoelectric ceramic sheet TD has a large equivalent inductance, which in addition to determining the operating frequency of the circuit, is also the working load of the atomizer. If the piezoelectric ceramic piece TD is replaced, it is not necessary to adjust other parameters of the circuit, and the oscillator frequency can also automatically track the frequency of the new piezoelectric ceramic piece to work.
2. The ultrasonic transducer TD (also known as the atomizing head) in the water level control and bias circuit and the two water level control stylus mounted thereon are immersed in a shallow aqueous solution. If it is atomized for a long time, once the liquid level is lowered and the water level control stylus of the atomizing head is exposed to the water surface, the oscillator will automatically stop working, which also prevents the atomizing head from being damaged by heat.
The BG2, BG3, stylus A, B and associated resistors in the circuit of Figure 1 together form a water level control circuit. When the circuit is in operation, the power supply supplies power to the emitter of BG3 through stylus A, B and aqueous solution. The BG3 tube is turned on. The BG2 tube acts as a switch. When BG3 is working, the BG2 tube is also turned on, and the power supply supplies bias current to the BG1 tube through BG3, BG2, R3, and L3, so that the BG1 tube oscillates. Once the liquid level is lowered and the control stylus is exposed to the water surface, the path of the power supply to the BG3 tube is cut off, the BG3 tube is turned off, and the BG2 switch is also turned off. At this time, the BG1 stops oscillating rapidly due to no bias current. Adjusting the resistance of resistor R3 can directly change the bias current of BG1 tube, so the debugging of the oscillator is very simple and convenient. D7 in the circuit is the protection diode of the BG1 tube be junction.
Second, the structure and use of ultrasonic atomizer
1. The structure of the atomizer, the shape of the atomizer is shown in Figure 2. The outer casing of the atomizing head is made of a copper material. The surface of the copper shell is chrome-plated and polished. The outer dimensions are 442mm×l5mm. The copper shell is packaged with a transducer (nickel or titanium high-frequency piezoelectric sheet) and the power tube BG1. The device is placed close to the BG1 tube to dissipate heat in the solution during operation. The cast copper shell is detachable, and the piezoelectric sheet can be replaced by simply rotating the positioning opening on the shell surface. In addition, the two water level control styli are fastened in the copper shell and arranged at a certain distance and then vertically protruded to a certain height outside the shell to control the lowest water level of the atomized solution.
The atomizer power supply and working circuit are separately installed in an engineering plastic case. When the input of the device is plugged into the power supply, the output will supply power to the atomizing head through the wire. It is said that the atomizer manufacturer not only provides finished products of atomizers, but also provides a full set of parts for sale.
2, the use method, if the atomizer is used for indoor humidification or disinfection, a small plastic pot can be prepared, the pot contains a certain amount of solution, the amount of the solution should not be too much (shallow water), only higher than the water level stylus A certain distance (the solution is too deep and the amount of atomization is relatively reduced). Then place the atomizing head flat and immerse the two styluses in the solution. At this time, just plug in the power and the solution starts to atomize immediately. If the atomizer is used for a bonsai, it can be carried out by referring to the above method.