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Both the switching power supply and the charger are power supplies, and the charger can be made with a switching power supply or without a switching power supply. But most of the chargers still use the switching power supply, after all, the switching power supply has its advantages in this respect.
What is a switching power supplySwitching power supply, also known as switching power supply, switching converter, is a high-frequency electric energy conversion device. Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. Compared with the linear power supply, the cost of the switching power supply increases with the increase of the output power, but the growth rate of the two is different. The cost of the linear power supply is higher than the switching power supply at a certain output power point. This point is called the cost reversal point. With the development and innovation of power electronics technology, switching power supply technology is constantly innovating. Switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry.
Switching power supply can be used to charge rechargeable batteries.
The current various chargers and power adapters all use a switching power supply design.
The finished charger, the internal circuit switching power supply has a reasonable isolation between the hot and cold ground, the output will not be charged, and the charging operation will not get an electric shock. It is better to choose a switching power supply that can output a larger current, but if it is too large, the cost will be high; mainly the output voltage can only be higher than 1.2% of the battery voltage. If it is too high, the current will be too large during charging and damage the charger.
The 5 1.2v/2300mAh batteries connected in series are only 6V, and a switching power supply with a charging output voltage of 7.2V should be selected. If a 12V 1.7A switching power supply is used, the switching power supply will quickly burn out, but the output voltage of the switching power supply is 12V After it can be adjusted to 7.2V (pay attention to the isolation of hot ground and cold ground), it can be charged normally.
How to charge the switching power supply? The difference between switching power supply and chargerThe switching power supply we are talking about is mainly responsible for converting direct current into high-frequency pulsating direct current, and then stepping down through the transformer through the high-frequency switch. Through this step, the high-frequency AC part can be removed, so that low-voltage direct current can be obtained, and the computer The most important part is the switching circuit, so the computer power supply is also usually called switching power supply. In fact, the popularly called switching power supply is the "transformer" we call on the computer.
The charger we use is different. The charger generally converts 220V AC power into a more suitable DC voltage. According to the type of rechargeable battery, a charging management circuit will be added, and then the rechargeable battery can be charged. , Although the charger can be used as a switching power supply, not all chargers are switching power supplies.
In fact, the switching power supply is used to make the charger. The switching power supply can be used in many ways, but the charger can only charge the rechargeable battery. According to the nature of the rechargeable battery, the charger has different charging requirements. There are many types of chargers nowadays, such as constant current and constant voltage chargers, travel chargers and so on.
Precautions for switching power supply chargingCan't charge directly
1. If two lithium batteries are connected in series to form 7.2v, then the maximum charge is 3.6*1.16=8.3v
2. If it is a lead-acid battery, it can be charged up to 7.2*1.2=8.6v
Although the original charger outputs a voltage of 12v, this may be a no-load floating voltage, and it will come down as soon as the battery is connected. Your battery is 2000mah, and the charging current is generally safe between 2000/10--4=200-500ma. Although the original charger has a nominal output of 800ma and 12.8v, the power of the switching power supply on the market today is all For the virtual standard, a discount is required. In fact, the safest current is 1/10=200ma, which is the most fully charged and the longest battery life, but the charging time is longer. So the 12v output voltage of your switching power supply is too high. It cannot be charged directly without adding constant current and step-down voltage, and it will really explode.
There is another possibility: this electrical appliance has a built-in charging circuit, then the 12v switching power supply can be used by installing the battery in the electrical appliance. No need to consider the 0.8v voltage difference. As for the large current, it does not matter. If it is small, the switching power supply will heat up (just test the case temperature by hand) and burn.
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