What should I pay attention to when installing the power module?

The reason why the accessories are called accessories is mainly because it has to be combined with other accessories to be able to play its due effect, the power module is the same, we have to install it after we buy it, so what problems do we need to pay attention to when installing the power module? Let's take a look!

1. As the first step of installation, Huizhi Electronics believes that it is necessary to stabilize the metal shell of the module power supply to ensure safety, but the shell cannot be connected to the zero line by mistake.

2. Before plugging in at the end of installation, the wiring on each terminal block should be checked and checked again to ensure that the input and output, AC and DC, single-phase and multi-phase, positive and negative electrode, working voltage value and current are accurate, so as to avoid the occurrence of wrong connection and wrong insertion.

3. For high-power power supply, there are generally 2 or more "+" output terminals and "-" output terminals. In fact, they belong to the same output electrode, but in order to make it easy for the customer to wire, they are connected together internally.

4. In order to achieve full heat dissipation effect, the module power supply should be installed in a part with better gas convection. Generally, when the working current of the linear power supply is above 4A, or the working current of the switching power supply is above 7A, forced air cooling should be installed. In addition, no other objects are allowed to be placed on the module power supply housing.

5. For the high-voltage module power supply, the high-voltage danger area should not be touched during the application process and within 10 minutes after the power failure.

6. The module power supply cannot be forcibly disassembled and assembled, and it will be broken if it is forcibly disassembled.

1. Under the same conditions.

The transmission current of the wireless module is different for different antennas, but the difference is not too big. Assuming that the power supply voltage is consistent with the working voltage of the module, the maximum instantaneous current needs to be greater than the module transmit current, and usually, some margin needs to be reserved.

2. To ensure the stability of the power supply, the smaller the power ripple, the better, usually, 100 millivolts.

3. If the DC power supply voltage is too high, and it is converted to the working voltage of the module through the DC-DC circuit, it is recommended to add TVS at the output end of the DC-DC circuit to suppress the power pulse.

At present, most of the module power supplies are positioned in the high-end market, at least above 500W, and the workmanship is absolutely exquisite, and the interface module is also very fine. However, frequent plugging and unplugging will still lead to damage to the interface and poor contact, so it is recommended that users try to prevent frequent plugging and unplugging when using.

Of course, for beginners with little experience, it is not easy to connect the power cord with the modular power supply. According to the author's understanding, the interface of the modular power supply is partially covered by patents, and other manufacturers cannot design the modular power supply according to the same specifications.

This has led to many mechanical and electrical manufacturers having to "stand out from the crowd" and "seek characterization" in the design of module power supplies, and finally form a situation of "a hundred flowers blooming, a hundred flowers blooming". However, the primitive modular interface has become a problem that consumers need to pay attention to.

First of all, some module power interface cables on the market are not divided into positive and negative, this situation is easier to operate, but more is the middle of the interface line is like but incomplete like the same situation, it is easy to plug in the wrong way, and the consequences of the wrong plug are also very significant - burning the equipment, this situation needs our attention.

The loss of high-power module switching power supply mainly includes four parts: high-frequency switching loss, high-frequency transformer loss, rectifier loss and line conduction loss. The lower the output voltage, the larger the output current, the greater the proportion of the rectification loss and line conduction loss in the total loss of the module switching power supply.

Diode loss.

In the traditional rectification, the diode is used for rectification, and the Schottky diode is generally used for rectification under the condition of low voltage output, and the Schottky diode has the advantages of fast switching speed and forward voltage reduction compared with other rectifier diodes, but the forward voltage drop of the Schottky diode is related to the size of the rectifier output current, the larger the rectifier output current, the greater the forward voltage drop, which may be higher or larger, and the reverse leakage current of the Schottky diode is larger.

Synchronous rectification technology, on the other hand, uses a field effect transistor (MOSFET) with low on-resistance and low withstand voltage to replace ordinary rectifier diodes. Because the synchronous rectification MOSFET has the characteristics of low on-resistance (generally only a few meters), small leakage current during blocking, and high switching working frequency, it can greatly reduce the power consumption of the power supply rectification part, and the work efficiency of the power supply system is significantly improved, but the realization of synchronous rectification in specific applications is more complicated than diode rectification. In the application of low voltage and high current output of switching power supply, synchronous rectification technology has a good application prospect.

Losses in magnetic components.

The transformer loss is also an important part of the module switching power supply loss, and the transformer loss mainly includes iron loss and copper loss. Iron loss refers to the high-frequency loss caused by the material, shape, process structure and other related factors of the transformer, and the copper loss refers to the conduction loss caused by the transformer winding line.

At the same time, in order to reduce the volume of the module switching power supply, the switching frequency of the module switching power supply should be increased as much as possible, if it is to be increased to about 500kHz or higher, the loss of ordinary core materials is very large, and the core is easy to overheat and magnetic saturation, so that it cannot work normally, so the high-frequency core material with excellent magnetic characteristics must be selected in the module switching power supply.

The size of the magnetic component is closely related to the switching working frequency, in the allowable working frequency range of the magnetic component, the size of the magnetic component is inversely proportional to the switching working frequency, in order to reduce the volume of the magnetic components such as the high-frequency switching transformer and inductor of the module switching power supply, the switching working frequency needs to be increased.

At the same time, the design of the high-frequency switching transformer winding in the module switching power supply is also very important, the winding of the high-frequency switching transformer not only has an impact on the copper loss, but also relates to the coupling between the windings of the high-frequency switching transformer, and also has an impact on the iron loss of the high-frequency switching transformer, and the design and manufacture of the high-frequency switching transformer has a great impact on the working performance of the module switching power supply.