Vertical tripod inductor:
Product name: Tripod inductor
Tripod inductor features: high power and high magnetic saturation, low impedance, small size.
Tripod inductor application: used in lamp type, automotive products. High efficiency, low temperature rise, alarm booster, LED lighting, smoke alarm, doorbell, welcome sensor, anti-lost device, smart lock alarm inductor, Nebulizer, aromatherapy machine, humidifier
Commonly used three-pin inductor series: I3W0406 three-pin inductor series, I3W0608 three-pin inductor series, I3W0810 three-pin inductor series, I3W0912 three-pin inductor series, I3W1016 three-pin inductor series.
Equivalent circuit diagram of alarm booster three-pin inductor:
Three-pin inductor boost circuit working principle diagram 1:
The three-leg inductor boost alarm circuit in Figure 1 consists of four components: resistor R1, resistor R2, capacitor C1, and capacitor C2.
These four components can be adjusted according to the circuit requirements of the body.
For example, you can change the resistance to 20 ohms or 100 ohms, change the C1 capacitance to 104, and reduce the mutual interference between the boost circuit and the driver IC.
In the three-pin inductor boost alarm circuit, R3 is also a current-limiting and decreasing resistor between an IC and the driver.
In the three-pin inductor boost alarm circuit, Q2 is a high-amplifier triode. A transistor with a higher power and a higher amplification factor is selected.
In the three-pin inductor boost alarm circuit, BZ1 is a piezoelectric buzzer. There are two types of piezoelectric buzzer, one is an active piezoelectric buzzer and the other is a passive piezoelectric buzzer. This circuit is suitable for Use a passive piezoelectric buzzer.
Wiring diagram of alarm three-pin inductor piezoelectric sheet:
Piezo sheet material: At present, the more common lead germanium titanate piezoelectric ceramic sheet (PZT) is made by sintering after preparing zirconium, titanium and lead oxides.
Piezo sheet effect: The piezoelectric effect is reversible: if audio voltage is applied to a piezoelectric ceramic sheet, mechanical vibration can be generated and a sound can be generated; back pressure inductance.
Piezoelectric sheet characteristics: Given that the human ear is most sensitive to sounds with a frequency of about 3 kHz, the resonant frequency f0 of the piezoelectric ceramic sheet is usually designed at about 3 kHz. In consideration of working at low frequencies, it is difficult to meet the frequency requirements with only one piezoelectric ceramic plate, and a dual-diaphragm structure is generally used.
In consideration of working at low frequencies, it is difficult to meet the frequency requirements with only one piezoelectric ceramic plate, and a dual-diaphragm structure is generally used.
When the piezoelectric sheet has two poles, one wire is connected to the power supply, and one wire is connected to the three-pin inductor secondary, as shown in the electrical schematic diagram of Figure 1. The physical wiring of the piezoelectric sheet is shown below.
Three-pin inductor boost circuit works:
The three-pin inductor boost principle uses the mutual inductance characteristics of the inductor to convert the primary energy into magnetic energy. When the magnetic energy is induced to the secondary, the secondary converts the magnetic energy into electrical energy again. A series of electromagnetic conversion processes, as long as the primary is designed as a small inductor The secondary is designed to have a large inductance. When the inductor flows an alternating current, a boosting effect can be achieved.
Example of three-pin inductor driving piezoelectric ceramic chip circuit: Three-pin inductor Use specification: I3W0912-561K-983K-PVC
Factors affecting the sound level of the tripod inductor-driven alarm:
1. The size of the piezoelectric buzzer. The amplitude of a large piezoelectric buzzer is larger than that of a larger sound. The commonly used sizes are 27mm and 35mm.
2. The power for driving the triode is larger, and the magnification is larger. There is enough driving current and driving voltage to drive the piezoelectric film. For example, SS8050 and so on can be used. (SS8050 and S8050 are similar, one with S and one with S. There is a difference between the two SSs). Using genuine triodes will have better results. In addition to SS8050, other better triodes can also be used.
3. The piezoelectric buzzer should have a bee cavity. The design of the bee cavity is more important than the design of the circuit. The design is reasonable, which can improve the number of sound DBs.
4. The turns ratio of the three-pin boost inductor and the wire diameter of the three-pin boost inductor. There are two conditions for the alarm sound of the piezoelectric film. One is the driving voltage and the other is the driving current. The turn ratio of the three-pin boost inductor determines the boosted voltage amplitude. The wire diameter of the three-pin boost inductor determines the driving current for driving the piezoelectric sheet. If the current is not enough, the load capacity is small, and the driving voltage is lowered to affect the sound.
Plug-in shielded inductance:
Product model: I0810, I1012, I1014, I1215, I1614, I1619 (8 * 10, 10 * 12, 10 * 14, 12 * 15, 16 * 14, 16 * 19)
