Need to pay attention to the easy aging of small components in the drive circuit during the maintenance process of the inverter - News - Global IC Trade Starts Here Free

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Inverter maintenance personnel often find in the maintenance process that some inverter modules are often burnt out, and each time a new module is replaced after burning, there is not much consideration. The electrical automation technology network Xiaobian tells everyone that the module burns out most of the drive. Not normal is related. Pay more attention to the relatively easy to age or damage small components in the drive circuit during the maintenance process. Such as small capacitors, resistors, optocouplers, voltage regulators, insulating varnish and other parts. The following is a description of each of the smaller components that are more susceptible to aging and injury.

Optocoupler

The full name of optocoupler is optocoupler, also known as opto-isolator, referred to as optocoupler. It has good isolation for input and output electrical signals, so it is widely used in various circuits. It has become one of the most versatile and versatile optoelectronic devices. About the characteristics of the circuit driven by optocoupler: Because this circuit has a feedback detection loop, it is to retrieve the signal from the output three-phase (Eu, Ev, Ew) and the drive signal respectively, when the inverter output is detected to be abnormal. , through a photocoupler to send a high level signal to the main board, the inverter immediately cut off the drive signal and display "overcurrent" or "IGBT short circuit" fault, this protection is quite fast, the inverter with this circuit is not easy to burn the module However, the problem is that when the performance of the drive components of the inverter is unstable, aging and other problems affect the drive work.

Zener tube

The Zener diode is also a crystal diode that operates with a stable voltage characteristic in the breakdown region of the PN junction. Zener diodes are widely used in voltage regulators and some electronic circuits. We refer to this type of diode as a Zener to distinguish between diodes used in rectification, detection, and other unidirectional conduction applications. Ordinary electricians are more difficult to detect, and it is best to be able to replace them all! When repairing the inverter, it must be under the overall maintenance: the circuit board is dusty, it is cleaned with sprinkle, and after drying, spray the insulating paint.

Insulating paint

Insulating varnish is an important insulating material based on high molecular polymer, which can be cured into an insulating film or an insulating whole under certain conditions. It is a kind of special lacquer in lacquer. The aluminum foil of the radiator should also be dust-removed. If the cooling fan is broken or there is a sound, it will be replaced with new ones; the filter capacitor capacity should be changed by 20% (generally no more than 8 years); all the main circuit coupling screws should be tightened. About the disassembly and assembly of the disassembly: Some people often disassemble the patch integration block because the temperature of the soldering iron is too high, so that it is damaged or the performance is degraded. Before disassembling the block, a small piece of water or sprinkling can be attached to the integrated block. The paper is used for heat dissipation, and the effect is good!

resistance

Resistance, the hindrance of a substance to current is called the resistance of the substance. A substance with a small resistance is called an electric conductor, and is simply a conductor. A substance with a large electrical resistance is called an electrical insulator, or simply an insulator. The measurement of the resistance of the capacitor, the pointer of the multimeter will swing an angle, the larger the capacity, the greater the angle! Discharge the capacitor during the second measurement (short the two feet)