Thyristor module overvoltage, basically has the following reasons: (
Transformer; the surge voltage when the input
The surge voltage transformer tap change;
When lightning invasion of surge voltage;
Dc circuit disconnection when the surge voltage.
In the circuit, to join a surge absorber can absorb transformer electromagnetic transfer system and intrusion of surge voltage, at the same time also can absorb the transformer on and off when the magnetic energy.
To avoid lightning invasion of surge voltage, semiconductor arrester can be used.
Eliminate the circulation is a key problem of the voltage regulator, in order to solve this problem, we adopted technical measures are as follows: (
Make sure that the thyristor
module reliable trigger signal.
Use software filtering program to make the output control signal for each group is only one valid, secondly the circulation using 74 ls273 and research of the logic circuit (
To ensure that even under the condition of single chip microcomputer control also won't appear triggered by mistake.
In addition, the trigger signal adopt measures such as shielding wire, lead to prevent interference.
To ensure that the conversion is reliable.
In normal work, often want to change the size of the offset voltage, that is to adjust the thyristor module combination of conduction, such as: the conduction in S1 to S2 conduction, must switch off in S1 to S2 trigger control signals at the same time, the transition of thyristor module.
If the timing of the transformation or improper combination can form circulation, damage the thyristor module.
Using the zero switching technology in the design, namely in the current zero to S1 shut off naturally, and trigger the S2 make its conduction.
Thus, in the process of transformation is a pivotal zero crossing detection current signal accurately.
For this, take a combination of software and hardware and interlock technology, to ensure the accuracy and correctness of the zero signal.
Actual operation shows that the technology has successfully solved the circulation problem.
Zhejiang rectifier co. , LTD. , the production of various kinds of specifications models of thyristor module, thyristor module, solid state relay module, rectifier bridge module, such as supporting the radiator products, sincerely look forward to the cooperation with various companies and procurement staff, to provide affordable, quality and reliable electronic components.
Consultation telephone: 0577 -
62627555, we serve you wholeheartedly!
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