HS code-driven import quality checks

List of the catalog of this article:

• 1, How many power supplies are there in the DC system
• 2, What parts does the DC power supply system consist of
• 3,The difference between AC power supply and DC power supply
• 4、Classification of DC regulated voltage power supply
• 5,HS code-driven import quality checks Which power supplies are DC power supplies?

How many power supplies are there in the DC system

1. DC power supplies include: batteries, rectifiers, etc. Battery Battery is one of the most common DC power supplies, which is widely used in electronic devices and portable devices. The battery is usually composed of positive and negative poles, which convert chemical energy into electrical energy through chemical reactions and provide it to the equipment for use.

2. Linear power supply: Linear power supply is a relatively common DC power supply, which can convert mains power (alternating current) into the required direct current output. Battery power supply: Battery power supply is a power supply that converts the energy of electrochemical reactions into direct current. It is suitable for wireless communication systems, electric vehicles, digital cameras and other devices that need to use batteries.

3. Automobile power supply is generally powered by car batteries or cigarette lighters. First, such low-voltage direct current is converted into DC power of about 265V; then it is the real transformation stage, which converts high-voltage direct current into 220V and 50Hz alternating current.

4. The DC power supply system is mainly composed of two major parts. One part is the battery screen and the other part is the DC charging screen (DC screen). The battery screen is a cabinet (800×600×2260) that can accommodate multiple batteries.

5. The communication power supply battery has a small discharge current, a large capacity and a long service life. Each monomer is 2V (generally 23~27V), and a set of 48V batteries is composed of 24 monomers in series. The communication power supply battery of the Southern Power Grid adopts a valve-controlled lead-acid battery.

6. Power transformer: convert the AC power of the city power into a numerical value that meets the needs of rectification. Rectifier circuit: convert AC voltage into one-way pulsed DC voltage. Filter circuit: Filter out the AC component in the pulsating DC voltage to form a smooth DC voltage.

What parts does the DC power supply system consist of

1. [Answer]: A, B, C, E This question assesses the composition of the DC power supply system. The DC power supply system is composed of DC power distribution screen, rectifier equipment, storage battery, DC converter and other parts.

2. The DC power supply system is mainly composed of two major parts. One part is the battery screen and the other part is the DC charging screen (DC screen). The battery screen is a cabinet (800×600×2260) that can accommodate multiple batteries.

3. The DC power supply consists of four parts: transformer, rectifier circuit, filter circuit and voltage regulator circuit. The AC voltage with a frequency of 50hz and an effective value of 220v is converted into a single-phase small-power DC regulated voltage power supply with a voltage amplitude of several volts to tens of volts and an output current of less than a few amps.

The difference between AC power supply and DC power supply

1. The conversion method is different. The former generally needs to go through oscillation first, and then through inverter, and then to obtain alternating current with different sine waves. The latter generally needs to be rectifier first, and then filtered through the wave, and then pulsating direct current can be obtained.

2. The differences between AC power supply and DC power supply are: current direction, voltage form, power supply nature, application field, etc. Current direction In the AC power supply, the direction of the current will change periodically, that is, the direction of the current will change over time. In the DC power supply, the current always flows in one direction and does not change.

3. Direct current and alternating current generally mean alternating current and direct current. The differences between alternating current and direct current are: different stability, different voltage, different current, different voltage direction, different essence, and different function.Stability is different: the direction of direct current will not change with time, and it is relatively stable.

4. The difference between AC power supply and DC power supply: positive and negative poles. Direct current has a difference in the direction of positive and negative poles. The direction of alternating current is always changing periodically, and there is no positive and negative poles. Transmission characteristics Alternating current can be conveniently boosted and deceded through transformers, which is conducive to power generation and distribution, but not to long-distance transmission.

5. Simply put, AC is 220V electricity, while DC is the electricity of a dry battery. Direct current refers to a current whose size and direction change with time, while alternating current refers to a current whose size and direction change periodically with time.

Classification of DC regulated voltage power supply

rootAccording to power classification: the output power is relatively small, usually below 10W, suitable for small electronic devices and low-power applications. The output power is between 10W and 100W, which is suitable for most electronic devices and medium-power applications. The output power is large, usually above 100W, which is suitable for high-power applications, such as communication equipment and industrial equipment.

DC regulated voltage power supply can be divided into chemical power supply, linear regulated voltage power supply and switching voltage regulator power supply according to custom. Next, we will introduce these types of power supply in detail. Chemical power supply Dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride and lithium-ion batteries are all chemical power supplies, each with its own advantages and disadvantages.

Classified according to the voltage, current and power used. The voltage used is generally from 0-800V, and the current is oneGenerally from 200-600A, the power is from 10KW-500KW, so you can choose according to your needs.

What types of DC regulated power supplies include? Multi-channel adjustable DC power supply Multi-channel adjustable DC power supply is a kind of adjustable power supply, which is characterized by the fact that a single power supply can independently set the voltage for two, three or four outputs. Basically, it can be regarded as a combination of multiple single-output power supplies, which is suitable for situations where multiple voltage power supplies are required.

DC regulated voltage power supply can be widely used in national defense, scientific research, colleges and universities, laboratories, industrial and mining enterprises, electrolysis, electroplating, DC motors, charging equipment, etc. It can be used for all kinds of electronic equipment aging, such as PCB board aging, home appliance aging, various IT products aging, CCFL aging, lamp aging.

Which power supplies are DC power supplies?

1. DC power supplies include: batteries, rectifiers, etc. Battery Battery is one of the most common DC power supplies, which is widely used in electronic devices and portable devices. The battery is usually composed of positive and negative poles, which convert chemical energy into electrical energy through chemical reactions and provide it to the equipment for use.

2. Photocell: Solar cell is a kind of battery that converts light energy into electrical energy. Silicon photocell is a typical photocell with stable performance and long service life. It has been widely used in calculators, radios, etc., and silicon optical batteries are commonly used as power on artificial satellites.

3. Generally, there are both DC power supply and AC power supply inside the electrical industry. Inside any electrical appliance, the power supply of the control part must be DC.The driving part is generally alternating current.

4. Daily residential electricity, power supply stations, high-voltage transmission grids, thermal power stations, etc. are all AC power supplies. Mobile phone batteries, dry batteries, flashlight batteries, and button batteries in electronic watches are all DC power supplies.

5. DC power supply: a device in which the direction of current and voltage does not change periodically with time, such as storage batteries, DC generators, dry batteries, and DC voltage regulators. AC power supply: a device in which the direction of current and voltage changes periodically over time, such as AC uninterruptible power supply (UPS).

6. There are dry batteries, storage batteries, most electronic circuit boards, etc. that belong to direct current. Direct current: refers to the current that does not change with time, collectively called direct current. The direction of direct current has always been unchanged, but the size can change.In the DC circuit, the current always starts from the positive pole and returns to the negative pole through the load.