Switch type and characteristics of commonly used switch
Many switches are used in electrical devices. The purpose of a switch is to disconnect, switch on, or switch electrical circuits to control the operation or stop of electrical devices. Their types and specifications are numerous and they are widely used.
The text of the slide switch is indicated by "S" or "K3". The "pole" of the switch corresponds to what was called the "knife" in the past, and the "bit" corresponds to what has been called "throw" in the past. For example, a bipolar two-position switch is the original double-pole double-throw switch. The pole of the switch corresponds to the movable contact of the switch (contact, contact knife) and the position corresponds to the stationary contact of the switch. When moving or toggling the switch, the movable contact is connected (or disconnected) to the stationary contact, thereby acting as an on or off circuit.
Since a single-pole unit switch has only one movable contact and one stationary contact, only one circuit can be switched on or off. A single-pole, two-position switch can be configured to switch on (or off) one of the two circuits; a two-pole, two-position switch can switch on or off two separate circuits at the same time, and the effect of other pole position switches can be analogized.
1. Slide switch
The sliding switch is internally provided with a slider. The slider is driven in different ways to make the slider actuate, and the switch contact is turned on or off, thereby functioning as a switch. Slide switches are dial-type, lever-type, rotary, push-type and soft-belt-type.
Toggle switch, toggle switch generally consists of a metal shell, reed plastic bracket and switch piece composed of three parts, the insulating substrate of the switch sheet is generally a glass plate, the top is crimped with two rows of cut-in fixed contacts; plastic bracket open There is a small groove, and the corresponding bite-type slide reed is fixed in the groove; the metal shell fixes the reed plastic bracket and the switch piece together. When the switch is toggled, the plastic bracket drives the reed to slide on the fixed contact piece on the switch piece, positioning the bead and the spring to position the switch action, and ensure that the switch position will not be misaligned under certain vibration conditions.
The commonly used toggle switches have one pole, two poles, one pole, three poles, two poles, two poles, two poles, three poles, four poles, three poles, four poles, four poles, ten poles, three poles, four poles and ten poles. Among them, multipole and multi-position switches with more than 3 poles are mainly used for band conversion. The number of bits of some band switches can be as many as a dozen bits, and more than ten gears can be changed.
The toggle switch is usually soldered directly to the printed circuit board. It has the advantages of small size, short lead wire connection, and low price. However, due to structural reasons, the number of digits and the number of blades may not be too much. The voltage switched in the circuit must not be too high and the current must not be too large. The toggle switch is widely used in radios, tape recorders, televisions, and various instruments and meters. It is used as a band switch, a channel switch, a function (input/receiving, etc.) switch, a tape selection switch, and a Dolby noise reduction switch.