The car inverter (Power Inverter) is a kind of AC power converter that can convert DC12V DC into the same AC220V AC as the mains. Vehicle power inverters are widely welcomed in foreign markets. In foreign countries, because of the high penetration rate of automobiles, the inverter can be connected to the battery to drive the electrical appliances and various tools to work when going out to work or going out to travel. After China enters the WTO, there are more and more private vehicles in the domestic market. Therefore, the car inverter power supply as a converter for DC to AC used in mobile will bring a lot of convenience to your life. It is a kind of standing. Automotive electronic gadgets.
In recent years, with the continuous increase of domestic car ownership and the popularity of self-driving travel, a new type of car-mounted electric vehicle-vehicle inverter has begun to become popular, but because the domestic car inverter market is still in its infancy, the market products are not good. The owners are still relatively new to this. How to choose a reliable and safe car inverter has become a concern of the majority of car owners. So, what kind of electrical equipment is the car inverter? What problems should you pay attention to when choosing?
In layman's terms, a car inverter is an electronic device that converts a 12V (24V) DC power from a car into a 220V/50Hz AC that is commonly used in the home. With it, it can be used in a car. Appliances that can be used in the home, such as TVs, DVDs, refrigerators, laptops, printers, fax machines, game consoles, video cameras, digital cameras, etc., or charging their internal batteries, high-power inverters, Drive high-power electrical appliances such as electric drills, electric water heaters, microwave ovens, etc. In the developed European and American countries, car inverters have become an indispensable tool for every car.
Car inverter circuit schematic
From the output waveform, the car inverter can be divided into two types: sine wave output and square wave output. The former output is the same sine wave AC power as the grid we use every day, which can adapt to various loads, but the circuit structure is more complicated and the volume is larger; the latter circuit is simple, but it is more critical to the load and cannot drive the inductive load. Combining the advantages of both, the currently available vehicle-mounted inverters adopt the scheme of outputting analog sine wave without any exception. Compared with the square wave, the effect is improved, not only can drive the inductive load, but also has small volume and weight. Light, high conversion efficiency, stable output voltage, high reliability, and perfect protection functions.
When choosing a good inverter, you should pay attention to the following issues:
1. It is necessary to use metal casing products: the car inverter has large power and heat, so if the internal heat can not be dissipated in time, it will affect the life of the components, but there is a danger of fire. The metal casing has good heat dissipation characteristics on the one hand and does not burn on the other hand. Products with plastic casings are best not to be used. Even if a fan is added to help dissipate heat, one increases the noise during use. Second, the working life of the fan is generally short, which reduces the reliability of the whole machine. If the day stops, the consequences can be serious.
2, must choose split products, can not choose one-piece products:
There are four disadvantages of the integrated type. First, because the car cigarette lighter socket is not very deep, the back of the integrated product is heavier, and the bumps in the car driving process easily shake the inverter or cause poor contact. Second, the integrated inverter is inserted into the cigarette lighter socket, and the rear part is exposed for a long time, which will affect the right hand shifting operation. This is closely related to the safety of the driving, so pay attention to it. Third, since the plug is directly inserted into the cigarette lighter socket, the rear row of the integrated inverter cannot be used. Fourth, the one-piece housing is made of plastic. Everyone knows that the plastic is not resistant to high temperatures. Therefore, the contact between the integrated inverter and the cigarette lighter socket will generate high temperature through high current, which will cause deformation or melting of the head, which will cause fire. . Therefore, no matter whether it is safe to use or easy to use, it is impossible to use an integrated inverter.
3, the same power products, the volume is similar, the preferred use of heavier: as the saying goes, "a penny and a share." The heavier weight means that the outer casing is thicker, which is good for heat dissipation. It also shows that the internal transformer has a large power margin and can drive a high-power load for a long time.
4. Whether the various protection functions are perfect: A good car inverter should have perfect protection functions to protect your car and power supply under various conditions. It should also have an audible and visual alarm function to remind you to deal with various situations in a timely manner. Generally, the protection functions should be input undervoltage, overvoltage protection, overtemperature protection, output overload, and output short circuit protection.
5, conversion efficiency: This is a very important indicator of the inverter, the higher the inverter efficiency, the longer the battery is used, the smaller the inverter heat. Generally should reach more than 90%. However, this indicator user has no way to test, the user can only make a simple discriminating from the heat generated by the inverter through a load with a large power. A good inverter should be able to work for a long time without being burnt when it has a load of 80% of the nominal power.
6, cigarette lighter plug wire should be thick, the length should be convenient to use: in order to save costs, the current market products are generally not long, it is 0.5 meters, the rear row is not so convenient, personally think that the wiring is long Some are much easier to use.
7, the electrical power is greater than 150W, must use the battery clip directly from the battery to take power: car cigarette lighter socket can only pass about 10A current, so the high-power inverter must be equipped with a battery clip line directly from the battery to take power . Now some manufacturers in order to save costs, 300W products are not distributed bottle clip line, use this product, lightly burned the car wiring, but also caused a fire, please pay attention to the majority of car owners.
8, pay attention to the output socket form: to be able to use the national standard two-phase, three-phase plug. 90% of the products in the market are only American-standard three-phase sockets, which is very inconvenient to use. Although things are small, they can explain the strength of the company. Individuals think that products with national standard sockets and universal sockets should be preferred.
Use of car inverter
Because the inverter is an electronic product, engineers in the predecessor have conceived problems that may arise in all aspects, thus enabling more humanized products on the circuit. Therefore, the general inverter will have: protection circuit for overvoltage, low voltage and power. However, for inverters larger than 300W, not only the above protection, but also more temperature, low voltage alarm, fan power control and other circuits are added. Therefore, we will have many different operation errors during use.
1. When the load is idling, the inverter indicator is normal and the output voltage is normal. But when you plug in the load, you will hear the call and the red light will be on. The load does not work. The main reason for this problem is that the battery you are using is not enough, so when the load is connected, the load voltage is higher than the output power of the battery, so the battery voltage will drop to the voltage of the low-voltage protection circuit, and the low-voltage alarm and low voltage of the inverter. The protection circuit is working. This kind of appearance appears as follows: the sound is instantaneous (some machines' protection circuits are self-locking, so that the battery, inverter, and load are not damaged), and the red light is on. Some inverters sound on and off, and keep calling until you pull the load away. The red light is turned on and off (this kind of power protection circuit is self-recovery. Due to the load, the inverter battery is in an abnormal situation, it is easy to damage the battery.
2. The inverter indicates normal and the output voltage is normal. But when you plug in the load, you will hear the sound constantly and the load will work normally. This situation is also caused by improper use.
(1) The battery you are using is not enough, causing a low voltage alarm, but the voltage has not reached the voltage of the low voltage protection. So you will hear the long call, but the inverter works fine. There are two ways to deal with this problem: increase the battery or reduce your load.
(2) The inverter indication will be normal and the output voltage will be normal. But when you plug in the load, you will hear the sound constantly. This may be caused by the input line you are using is too small. This situation generally occurs in the modification of the inverter. The solution to the problem is to increase the input line. If it is 300W to 500W with 6 square lines, 1000W should use 10 square lines or more, and the size of the line is also related to the length of your input line. For example, 1000W uses 10 square lines and cannot be longer than 50CM. If you want to stretch the line, Which line of 16 square meters or more is used. The longest main energy is 1 meter.
3. Connect the inverter, the red light is on, no output. This is mainly because your battery may be overcharged and the voltage is too high. If there is a call, the problem is that the battery voltage is too low.
4. Connect the inverter fan without turning. In general, the fan of the inverter is controlled by the output power, that is, the fan speed is motivated by the load you use. This has the advantage of reducing quiescent current and reducing noise. Therefore, the fans are generally controlled to rotate above 100W, and it is normal for the fan to be less than 100W.
5. When the load is connected, the inverter is turned off. When the power is turned back on, the inverter is normal, but the load is also turned off. This situation is mainly due to the following reasons:
(1) Inverter power protection due to excessive load power. For example, an inverter with a nominal power of 300W, connected to a 350W load, will cause a shutdown.
(2) The peak value of the inverter is not enough. In general, the peak value of the inverter is typically set at twice the nominal power. For example, a 100W inverter can reach a peak of 200W. But sometimes, your load peak is more than 3 times, even if your power is 90W, 100W inverter can not drive, because 3 times the peak is 270W, it is greater than 200W. Therefore, buy the inverter must pay attention to the peak value of the equipment.
(3) The inverter power is not enough.
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