Leoni electrical components Germany Leoni model Leoni price

Leoni electrical components utilize the good conductivity and fluidity of mercury to control the opening and closing of electrical circuits. They consist of a glass tube, mercury, fixed electrodes, lead wires, etc. After evacuating the air from the tube, it is filled with various gases and sealed. It is suitable for environments with dust, oil, water vapor, and corrosive gases, and can also be used as an explosion-proof switch in places with explosive gases. Given the high surface tension and specific gravity of the mercury inside the tube, along with its fluidity, the position of the mercury changes immediately with even a slight tilt of the glass tube, and it contacts the electrodes via surface contact, thus enabling the switching of high AC and DC currents. Additionally, this type of switch features a service life of several million cycles at rated current, small size, high sensitivity, no mechanical noise, and low cost, so it has always been used as a switch for automatic control.

Leoni electrical component features

1. The function of a varactor diode is based on the principle that the capacitance between the PN junctions is variable; it is a semiconductor device used as a variable capacitor in high-frequency tuning, communication, and other circuits. Varactor diodes are reverse-biased diodes; changing the reverse bias voltage on the PN junction changes the PN junction capacitance. The higher the reverse bias voltage, the lower the junction capacitance; the relationship between reverse bias voltage and junction capacitance is nonlinear. 4. Graphical representation of the relationship between varactor diode capacitance and reverse bias voltage: (a) Increased reverse bias causes decreased capacitance; (b) Decreased reverse bias causes increased capacitance. The capacitance tolerance range is the specified capacitance range for a varactor diode. Datasheets will display minimum, nominal, and maximum values, which are often plotted on graphs.

Leoni electrical component functions

The starter solenoid switch is a key component of the starter motor, and the design quality of the solenoid switch directly affects the reliability of the starter motor. The starter solenoid switch has two functions: one is to connect the main circuit to rotate the starter motor, and the other is to push out the drive gear via the shift fork to engage with the engine flywheel ring gear. Therefore, the solenoid switch is required to have corresponding suction force, corresponding stroke, and contacts capable of reliably switching high currents. Additionally, it is required to minimize volume and weight as much as possible. Based on these characteristics, the contact structure of solenoid switches generally adopts a contact form, i.e., the moving contacts are made into bridge-shaped or disc-shaped forms to provide a larger heat dissipation surface and thermal capacity. The magnetic system mostly adopts a solenoid electromagnet structure to meet the requirements of corresponding stroke, corresponding suction force, small volume, and light weight. The moving iron core of the solenoid switch can move smoothly within the brass bushing equipped with a solenoid coil. The moving iron core pull rod is connected to the shift fork and one-way clutch. Under the action of the return spring, the moving iron core remains in the non-operating initial position. During starting, the starter drive gear needs to move forward by approximately 12-20mm. Therefore, when the solenoid switch begins to engage, a large magnetomotive force is required to generate the necessary initial suction force. After engagement, the air gap decreases, and the electromagnetic suction force increases sharply, greatly exceeding the force required to maintain the engaged state. For this reason, the solenoid switch uses two coils (pull-in coil and hold-in coil). Initially, both the pull-in coil and hold-in coil jointly generate electromagnetic suction force. After the switch contacts engage, the pull-in coil automatically disengages from the operating state, and only the hold-in coil maintains the switch in the engaged state. The hold-in coil current is relatively small and can be wound with thinner wire, which not only reduces the volume of the solenoid switch but also achieves reasonable suction force matching. To ensure the reliability of the starter motor, it is necessary to focus on controlling the design quality of the solenoid switch.

Leoni electrical component classification

a. By material: silicon transistors, germanium transistors. b. By structure: NPN, PNP. c. By function: switching transistors, power transistors, Darlington transistors, photosensitive transistors, etc. d. By power: low-power transistors, medium-power transistors, high-power transistors. e. By operating frequency: low-frequency transistors, high-frequency transistors, ultra-high-frequency transistors. f. By structural process: alloy transistors, planar transistors. g. By mounting method: through-hole transistors, SMD transistors.

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