Capacitor

Capacitor

Definition 1: An energy storage device that holds the charge

Definition 2: A component consisting of any two conductors (including wires) that are insulated from each other and are closely spaced apart.

Capacitive Load

Capacitive Load:

Generally, a load with a capacitance parameter is called the capacitive load, and the capacitive load will reduce the power factor of the circuit. During charging or discharging, the capacitive load is equivalent to a short circuit because the voltage across the capacitor cannot be changed abruptly.

Q: What are the characteristics of the inductive load (when working)?
A: Capacitive loads are leading (current leads voltage). In the DC circuits, capacitive loads prevent current from flowing, but can store energy. In the AC circuits, the current phase leads the voltage phase (compared to the power supply), and the phase can lead a quarter cycle (or 90 degrees) at the maximum.

Q: Which are inductive loads?
A: Device with a capacitor, such as a compensation capacitor. And power control devices such as switching power supplies, IT equipment and etc.

Canadian Standards Association

The Canadian Standards Association, short for CSA, was founded in 1919 and is the first non-profit organization in Canada to develop industry standards.

British Approvals Board Of Telecommunications

BABT-British Approvals Board of Telecommunications is a professional certification body for information and communication products owned by TUV SUD. It is also a Notified Body and Competent Body of CE authorized by the European Union.

bridge rectifier

The rectifier bridge, or rectifier bridge is a rectifier bridge-connected by two or four rectifier transistors. The half-bridge rectifier consists of two rectifier transistors, and the full-bridge rectifier consists of four rectifier transistors. The exterior of the bridge rectifier is encapsulated in insulating plastic, and the outer layer of the high-power rectifier bridge is covered with a zinc metal shell to enhance heat dissipation.

break-before-make

By default, the pole of the BBM (break-before-make, break before make) SPDT switch is connected to NO throw circuit and disconnected from the NC throw circuit. When the break-before-make switch is switched, it will first disconnect to the NO circuit, and then connect to the NC circuit.

BJT

Bipolar Junction Transistor (BJT), also known as a semiconductor triode, is a device that combines two PN junctions by a special process, and its structure is divided into PNP and NPN.

Bandgap

The band gap is the energy difference between the bottom of the conduction band and the top of the valence band in insulatorsand semiconductors. The larger the band gap, the harder it is for the electron to be excited by the valence band to the conduction band, and the lower the intrinsic carrier concentration and the conductivity.

Asynchronous Motor

The asynchronous motor, also known as an induction motor, is an AC motor whose ratio of the speed of the load to the frequency of the connected grid is not constant.

Asynchronous

For AC solid state relays, asynchronization(Synchronous) does not have any requirement for the consistency of the three factors (phase, frequency and amplitude) of the solid state relay and the load, which is the opposite to the synchronization.

Arc

An electric arc is a gas discharge phenomenon in which an electric current is generated by a momentary spark generated by some insulating medium such as air.

Apparent Power

Apparent power is the direct product of current and voltage in a circuit. For non-pure resistor circuits, the active power of the circuit is less than the apparent power. For a purely resistive circuit, the apparent power is equal to the active power.

In a sinusoidal AC circuit, the active power is generally less than the apparent power, which means that a discount on the apparent power is equal to the average power. This discount is Cosφ, called the power factor(PF).

The relationship among the apparent power, the active power and the reactive power is: S^2 = P^2 + Q^2

S=Apparent power (VA)

P=Active power (W)

Q=Reactive power (var)

Ambient Temperature

Ambient Temperature is a physical quantity indicating the degree of heat and cold in the environment.

Amplification

In the circuit, amplification is to amplify the voltage or power of the input signal.

air cooling

Air cooling is a type of cooling method that uses air as a medium to cool an object that needs to be cooled.

There are usually three methods:

1. Increase the surface area of the object to be cooled (ie, add a heat sink to the surface of the object, usually hanging the heat sink outside the object or fixing it on the object to make the heat dissipation more efficient)

2. Speed up the flow of air through the object per unit time (ie use an air-cooled fan to increase ventilation volumn)

3. Method 1 and Method 2 are used together

Air Conditioner

Air conditioning (often referred to as AC, A/C, or air con) is the process of removing heat and moisture from the interior of an occupied space, to improve the comfort of occupants. Air conditioning can be used in both domestic and commercial environments.Solid state relays are widely used in this field.

Active Power

In an AC circuit, the active power is the average of the integral of the instantaneous power that is emitted or consumed by the load in one cycle (or the power consumed by the load resistor). Therefore, it is also called the average power.

P = U*I*cosφ = S*cosφ
P = Active power
S = Apparent power

AC Solid State Relay

AC Solid State Relay works for the AC load. AC-SSR can be divided into divided into zero-crossing AC SSR, Random Conduction AC SSR, and Peak Conduction AC SSR, according to the control trigger mode; Divided into the Single-Phase AC SSR and the Three-Phase AC SSR, according to the phase of the AC supply; Divided into the Ordinary AC SSR and the Enhanced AC SSR, according to switch components.

AC Input-DC Output Type Solid State Relay

AC Input-DC Output Type Solid State Relay, AC-DC Solid State Relay, can control DC load circuit through AC control signal.

AC Input-AC Output Type Solid State Relay

AC Input-AC Output Type Solid State Relay, AC-AC Solid State Relay, can control AC load circuit through AC control signal.

AC

The current magnitude and direction of Alternating Current (AC) change periodically with time, and the average value in one cycle is zero.

Absorption Circuit

Absorption Circuit, also known as snubber circuit, is an important protection circuit for power electronic components. The snubber circuit can be used not only for the protection of semi-controlled devices, but also for fully controlled devices (such as GTR, GTO, power MOSFET and IGBT).

The basic working principle of the snubber circuit is to suppress the current rise rate (di) of the device by utilizing the characteristic that the inductor current cannot be abrupt, and to suppress the voltage rise rate (dv) of the device by utilizing the characteristic that the capacitor voltage cannot be abruptly changed.

Zero Crossing Detector

Zero Crossing Detector consists of transistors or IC components to detect the load voltage of the solid state relays, only if the load voltage has crossed the zero, the detector will allow the solid state relays to switch the load.

Low Power Device

Low Power Device, also know as input device or control device, is the input signal source of the soild state relays. Solid state relays can control the large current device with the low power signal from the input device.

Terminology Library Location : Home > Terminology Library > Optoelectronic Isolation

Optoelectronic Isolation is a method to isolate the input and output signals physically and electrically by using light as a signal medium to minimize interference between the two signals. Solid state relays use opto-coupler as signal isolation method, so its EMC (the ability to control EMI) is better than mechanical relays.

Power

Power refers to the amount of work done by an object in a unit of time. That is, the power is a physical quantity that describes the speed of work, and can be divided into electric power and power.

The electric power is the physical quantity indicating the current work speed. The power of a electronic component is equal to the power consumed by it in 1 second (t, unit is s) (W, the unit is J), that is, P=W/t. 

The magnitude of the electric power is also equal to the product of the voltage across the conductor and the current through the conductor: P = U*I. 

For a purely resistive circuit, the calculation formula of electric power can also be expressed as: P=I^2*R and P=U^2 /R.

Actuator

Actuator is a component of a machine that is responsible for moving and controlling a mechanism or system, for example by opening a valve. In simple terms, it is a "mover". In electronic and electrical systems, actuators are electric motor, solenoid valves, cylinder and etc.

Explosion Proof

In electrical engineering, hazardous locations are defined as places where fire or explosion hazards may exist due to flammable gases, flammable liquid–produced vapors, combustible liquid–produced vapors, combustible dusts, or ignitable fibers/flyings present in the air in quantities sufficient to produce explosive or ignitable mixtures. Electrical equipment that must be installed in such classified locations should be specially designed and tested to ensure it does not initiate an explosion, due to arcing contacts or high surface temperature of equipment. The solid state relays with better explosion proofing than that of mechanical relays can serve in the hazardous locations.

Insulation Resistance

Insulation Resistance is an ability of a device to protect against short circuit and electrical breakdown by using the Insulation Material. Solid state relays have better insulation resistance than mechanical relays.

Mechanical Shock Resistance

Mechanical Shock Resistance also known as shock proofing or toughness, is the ability of a material to absorb energy and plastically deform without fracturing. One definition of material toughness is the amount of energy per unit volume that a material can absorb before rupturing. It is also defined as a material's resistance to fracture when stressed. Solid state relays have better shock resistance than mechanical relays.