Power sources are devices that convert non-electrical energy into electrical energy; for instance, thermal power generation, wind power generation, and so on. What is our variable frequency power supply? "Variable frequency," as the name implies, refers to converting the standard alternating current into the frequency required by the customer. This can be converting 50Hz to 60Hz, or 50Hz to 400Hz power supplies. Additionally, variable frequency power supplies can also alter voltage, converting single-phase to three-phase, and serve a purification function by transforming low-quality electrical energy into high-quality energy.
When it comes to power supply, there's the concept of load. So, what is a load? A load is a device that consumes electrical energy, which is essentially any electrical appliance. The connecting part is used to link the power supply with the load, forming the intermediate link in the circuit path for the transmission, distribution, and control of electrical energy. With a load, there is an electric current, which is the orderly, directional flow of charge. By convention, the direction of movement of positive charge is considered the actual direction of the current. A circuit where the direction of current remains constant is called a direct current circuit.
Electric current, denoted by the symbol I, refers to the amount of electric charge passing through any cross-section of a conductor within a unit time. The unit of electric current is the ampere (A), with large currents commonly expressed in kiloamperes (KA) and small currents in milliamperes (mA) or microamperes (μA). 1 KA = 1000 A, 1 A = 1000 mA, 1 mA = 1000 μA.
