Function and application characteristics of high-quality key switch

The sliding switch is to make the circuit on or off by sliding the switch handle, so as to achieve the purpose of switching the circuit. Commonly used varieties of slide switches include single-pole double-position, single-pole three-position, double-pole double-position and double-pole three-position, etc. They are generally used in low-voltage circuits. They have the characteristics of flexible slider action and stable and reliable performance. They are suitable for small households. Electrical appliances, toys and small instruments and meters.

Features of the key switch

The key switch refers to a switch that uses buttons to advance the transmission organization, presses or disconnects the moving contact and the static contact, and completes the circuit switching. The key switch is a master electrical appliance with a simple layout and a very wide range of applications. In the electrical active control circuit, it is used to manually announce the control signal to control the contactor, relay, electromagnetic starter, etc. The key switch can complete basic operations such as start, stop, forward rotation, speed change, and interlock. Usually each key switch has two pairs of contacts. Each pair of contacts consists of a normally open contact and a normally closed contact. When the button is pressed, the two pairs of contacts act together, the normally closed contact is disconnected, and the normally open contact is closed.

Principle of key switch

The AC power input of the key switch is rectified and filtered into DC; the switching tube is controlled by a high-frequency PWM (pulse width modulation) signal, and that DC is added to the primary of the switching transformer; the secondary of the switching transformer induces a high-frequency voltage, which is rectified and filtered to supply the load Some of the output is fed back to the control circuit through a certain circuit to achieve the intent of stable output. The key switch is a relatively complex switch. Its components include handles, slides, contacts, terminals, springs, etc. The operation of the key switch is transmitted from the keys to the handle, and the handle controls the contacts and terminals to complete the opening and closing control of the contacts. Key switches can be divided into two types: single-key push-button switches and multi-key combination push-button switches. There are two types of key switches, one-key type and multi-key combination type. One-button pushbutton switches are usually used as power switches in TV sets. They are divided into self-locking and self-resetting (this kind of switch is turned on and self-locked by pressing it, and it is turned off and reset by pressing it again) and non-locking (cannot be reset). Confirm, turn on when pressed, reset after releasing) two layouts. Toggle switch Multi-key combination key switch is divided into self-locking, interlocking and non-locking layout types.　

Selection of key switch

The materials used in key switches and toggle switches are excellent in terms of flame retardancy, insulation, impact resistance and moisture resistance. The raw materials are stable and resistant to discoloration. In addition to using high-grade plastics, button switches also have metal materials such as gold-plated, stainless steel, and copper, providing more and more choices for everyone.