What are the smart relays, what are their special effects? Where is it?
Relay
When the input physical quantity reaches the specified value, an electrical appliance whose electrical output circuit is turned on or blocked. Widely used in the production process automation devices, power system protection devices, all kinds of remote, remote control and communication devices, modern automatic control system is one of the most basic electrical components.
The relay is usually composed of input sensing mechanism and output actuator. The former is used to reflect the change in the amount of input, the latter to complete the contact action (for contact relays) or semiconductor components on and off (for contactless relays). The relay has a jump input-output characteristic. When the relay receives an input signal X, only it reaches the action value Xd, the relay moves and outputs from zero to Ymax. The input signal continues to increase, the output signal is still Ymax unchanged. After the relay action, if the input signal is reduced, the relay only when the input is reduced to Xf only action, return to the starting position, the output signal jump back to zero. This characteristic is called the relay characteristic. Here, the input value (action value) of the relay start operation is adjusted so that the relay returns the maximum input value (return value) of the original state, the rated voltage of the contact and the current (contact rating value), and the relay is controlled by a state The time (operating time) to another state is the main technical parameter of the relay. They characterize the performance of the relay process, but also the basis for the selection of relays.
There are many types of relays. Such as electrical quantity relay (the input amount can be current, voltage, frequency, power, etc.), non-power relay (the input can be temperature, pressure, speed, etc.); protection relays, control relays; contact relays, Point relay; open type (no protection measures for main components), closed (plus protective shell), sealed (inside and outside the shell without gas exchange) and so on. Commonly used according to the principle of working principle of the relay are electromagnetic relays, polarization relays, reed relays, thermal relays and time relays. After the 20th century, the relay has great development, there have been magnetic non-contact relays, semiconductor contactless relays, dedicated integrated circuit electronic time relay, solid state relays, printed circuit board mounted (dual in-line) relay, and Protection relays with microprocessors and intelligent relays.
Intelligent relays are widely used in recent years, intelligent lighting switch. You can use the microcontroller to control it, when it reaches the operating voltage can turn on the circuit, or from the blocking effect, in many areas have applications. For safety, can play a long-range control role.
Relay (relay) is an electrical control device, when the input (excitation amount) changes to meet the specified requirements, in the electrical output circuit to control the amount of a predetermined step changes in an electrical appliances. It has a control system (also known as the input circuit) and the control system (also known as the output circuit) between the interaction. Usually used in automated control circuits, it is actually a small current to control the operation of a large current "automatic switch". So in the circuit plays an automatic adjustment, security protection, conversion circuit and so on.
