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Necessary for beginners! Common knowledge of switching power adapter parameters!

Voltage (U): In an electric field, the potential is shifted from the highest point to the lower voltage. The electric field produces work, which is called voltage, the unit of voltage: volt (V).

Current (I): In an electric field, free electrons and ionized electrons produce regular motions called currents, current units of amperes (A), milliamperes (MA).

Resistance (R): Resistance to the use of electrons in circuits in units of ohms (_) kiloohms (K_) megaohms (M_)

Fourth, Ohm's Law: U=I*R I=U/R R=U/I

Fifth, AC: In the circuit, the magnitude and direction of current and voltage and the change of time follow the sinusoidal exponential rule. This periodic change of time is called AC.

6. Frequency (HZ): The number of times the current changes in a second is called frequency.

Seventh, direct current (DC): The direction of the current will not change with time is called direct current.

8. Conductor: An object that conducts electricity well is called a conductor.

9. Insulator: An object that cannot conduct electricity is called an insulator.

10. Semiconductors: Objects between conductors and insulation are called semiconductors.

Eleven, Circuit: A current path connected by a power supply and various conductors.

12. Break: Two connected circuits in the circuit are not connected at one place.

Thirteen, Short Circuit: Two circuits in the circuit that should not be connected are connected directly.

14. Filtering: Accessing current filters reduces the fluctuation component of input as much as possible, and achieves as stable a DC current as possible.

No-load Voltage: Voltage value when no power-consuming equipment is connected to the circuit.

Load Voltage: The Voltage Value of Connecting Power Consumption Equipment in the Power-on Circuit.

Seventeen, Loss: Electric energy without work.

Eighteen, ripple: DC power supply is generally formed by the rectification and stabilization of power supply, which inevitably has some AC parts in the DC stability. The AC component superimposed on the DC stability is called ripple.

19. Power Factor (PF) Value: The ratio of active power to real power. In DC circuit, voltage multiplied current is active power, but in AC circuit, voltage multiplied current is apparent power, and the effective power which can play a part will be less than apparent power. The ratio of effective power to apparent power is called power factor. It is expressed in COSP and measured simply by electricity. The test method is to measure the difference between voltage and current, and the result is the power number.

Efficiency: In power adapters, efficiency refers to the ratio of output useful power to input driving power.

21. Standby power consumption: when the power supply is powered on but not connected to the load, the overall power loss at this time mainly comes from the no-load loss of the power supply itself. In this state, the overall power loss is called standby power consumption.

22. Constant Voltage Power Supply: It is required that the output voltage and electrical value should not change with the external working conditions such as load input voltage, and that the stable output voltage power supply can be provided relative to the change of influence.

Twenty-three, Constant Current Power Supply: Voltage load and other effects within a certain range of changes can provide a stable power output power supply.

Twenty-four, current limit: also known as protective point MAX current, electrically large current point, constant voltage power supply can output the maximum current.

Twenty-five, in series: the first and last of the electrical appliances are connected in the circuit in turn, and there is only one path in series. When and where a fault occurs, there will be a short circuit, R=R1+R2+R3.

Twenty-six, Parallel connection: Circuit where electrical appliances are connected to two points of the circuit in parallel, and parallel resistance: R=1/R1+1/R2+1/R3

LVD (Safety Regulation): Low voltage safety is the requirement of product certification safety. Include the safety requirements of product specification and fittings, and compose the safety standards of finished products.

EMI: Usually a low-pass filter circuit consisting of series reactor and shunt capacitor. Its function is to allow the frequency signal of the normal working time of the equipment to enter the equipment, but to hinder the high-frequency interference signal.

EMC: If the blood or system runs in accordance with the requirements in its electromagnetic environment, it will not produce unbearable electromagnetic interference to any equipment in its environment. Therefore, EMC includes two requirements: one is that the electromagnetic interference to the environment generated by the equipment during its normal operation should not exceed a certain limit; the other is that the electrical appliances have the equipment to the environment in which they refer. The existing electromagnetic interference has a certain degree of immunity.

30: Power: refers to the work done by an object in a unit time, that is, power is a physical quantity describing the speed of work, unit watt, symbol (W) and the relationship between current and voltage: W = i*U


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