Relay (English name: relay) is a kind of electric control device, is when the input quantity (excitation quantity) changes to meet the specified requirements, in the electrical output circuit so that the controlled quantity to occur a predetermined step change of a kind of electrical appliances. It has an interactive relationship between the control system (also known as input circuit) and the controlled system (also known as output circuit). Usually used in automated control circuits, it is actually a kind of "automatic switch" that controls the operation of large currents with small currents. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.
The rectifier (English: rectifier) is a device that converts alternating current (AC) into direct current (DC), which can be used to power supply devices and detect radio signals. Rectifier can be made of vacuum tubes, ignition tubes, solid-state silicon semiconductor diodes, mercury arc. On the other hand, a set of devices that convert direct current to alternating current is called an "inverter".
In a standby UPS, only the battery needs to be charged, not the load, so there is only a charger. In a double-conversion UPS, the device supplies power to both the inverter and the battery, so it is called a rectifier/charger.
The rectifier is a rectifier, which is simply a device that converts alternating current (AC) to direct current (DC). It has two main functions: first, to turn alternating current (AC) into direct current (DC), which is filtered and supplied to the load, or to the inverter; second, to provide charging voltage to the battery. Therefore, it plays the role of a charger at the same time.
The inverter is to convert DC power (battery, storage battery) into AC power (generally 220V,50Hz sine wave). It consists of inverter bridge, control logic and filter circuit. Widely used in air conditioning, home theater, electric grinding wheel, power tools, sewing machines, DVD, VCD, computers, TV, washing machines, range hoods, refrigerators, VCRs, massagers, fans, lighting and so on. In foreign countries, due to the high popularity of automobiles, you can use the inverter to connect the battery to drive electrical appliances and various tools. The car inverter output through the cigarette lighter is 20W, 40W, 80W, 120W to 150W power specifications. Larger power inverters should be connected to the battery through the connecting cable. By connecting household appliances to the output of the power converter, you can use all kinds of electrical appliances in the car. Electrical appliances can be used: cell phones, laptops, digital cameras, cameras, lights, electric shavers, CD players, game consoles, PDAs, power tools, car refrigerators and a variety of travel, camping, medical emergency appliances.