Classification by usage
Travel: travel is referred to as a mobile phone charger, portable charger, suitable for use in other countries including the use of travel time. So charger input parameters should be 100-240V, 50-60Hz. Fast charging can only be used at a specific voltage.
Car charger: car charger is referred to, is used in a car charger, usually one end is inserted into the car cigarette lighter, the other end is directly connected with electrical equipment, should pay attention to is to use the car charger voltage, input voltage standard of small vehicles is provided 12V. Under normal circumstances, we test the charger manufacturers in the test range between 9-15V. Some large vehicles provide input voltage is 24V. Our factory is in accordance with the following 28V test. In the use of the need to pay attention to the low-voltage car charger can not be used on the 24V vehicles. Otherwise it will damage the internal parts of the charger.
Charger: mobile phone charger is a relatively large volume, often equipped with LED or LCD prompt function, can be divided into single slot (and can only charge a mobile phone or only rechargeable batteries) and double groove (fit in the home or office) two.
Classification by battery type
1, Ni MH / Ni Cd battery charger. In accordance with single 1.5V calculation
2, lithium battery charger. In accordance with a single battery 4.25V calculation.
3, lead-acid battery charger. In accordance with a single battery 6.9V-7.3V calculation. The lead-acid battery is divided into with and without the function of floating charge floating charge function. Three section type float lead-acid battery charger. No load voltage is 6.9V. Charging voltage up to 7.3V. Without floating is no-load voltage 7.3V.
1.world voltage profiles
At present, there are two kinds of voltage used in indoor electricity in the world, which are 100V ~ 130V, and the type of is from 220 to 240V. 100V, 110 ~ 130V is classified as low voltage, such as the United States and Japan as well as on the ship, attention is paid to the safety; 220 ~ 240V is called high pressure, including Chinese 220 volts and 230 volts in the UK and many European countries, attention is paid to the efficiency. The use of 220 ~ 230V voltage in the country, but also the use of the voltage of 110 ~ 130V, such as Sweden, russia.
100V: Japan, South Korea 2 countries
110 ~ 130V: China, Taiwan, the United States, Canada, Mexico, Panama, Cuba, Lebanon and other countries of the 30
220 ~ 230V: China, Hongkong (200V), the United Kingdom, Germany, France, Italy, Australia, India, Singapore, Thailand, Holland, Spain, Greece, Austria, Philippines, Norway, about 120 countries.
2.travel abroad conversion plug
GB plug: used in China, Australia, New Zealand, Argentina, is characterized by three flat head.
American Standard plug: in the United States, Canada, Japan, Brazil, Philippines, Thailand and other countries and Taiwan, is a circular two flat.
Plug: British standard used in Hongkong and the United Kingdom, India, Pakistan, Singapore, Malaysia, Vietnam, Indonesia, Maldives, Qatar and other countries and regions, is three square.
The European standard (DIN): plug used in Germany, France, Holland, Denmark, Finland, Norway, Poland, Portugal, Austria, Belgium, Hungary, Spain, Sweden and other European countries and South Korea, Russia and other countries, the characteristics of the two round.
South Africa plug is mainly used in South Africa, India, Russia, the characteristics of the three round. There Italy standard (Italian) plug, Swiss standard (Swiss standard) plug, etc..
The use of a variety of standards in the same country or region is also available in the country.
Methods to reduce the transformer temperature rise is a lower maximum flux increment of the transformer core (Bm) value, because the loss of the transformer core (hysteresis loss and eddy current loss) is proportional to the square of magnetic flux density; the other is to reduce working frequency of switch power supply, because the loss of the transformer core (hysteresis loss and the eddy current loss is proportional to the frequency); another is to reduce the loss of the coil, the coil loss (mainly the eddy current losses), eddy current coil and the skin effect loss is proportional to the operating frequency, reduce the loss of DC coil must reduce the current density of the wire, the current density is not generally enameled over 4.5A/ mm.