The constant voltage transformer integrates voltage regulation, isolation and voltage transformation. It has a bidirectional filtering function, which can eliminate grid noise interference and has good anti-interference ability. The output is sine wave or quasi-square wave. It is an ideal regulated power supply for precision electronic instruments, microcomputers and CNC equipment. The constant voltage transformer has a "day" shaped iron core with the primary coil in one aperture and the secondary coil and resonant coil in the other aperture. The resonant coil has an external resonant capacitor whose resonance frequency is close to the power supply frequency.
When the primary power supply is turned on, the resonant circuit starts to oscillate, so that the secondary core is shallowly saturated to form a constant alternating magnetic field. The magnetic induction intensity is within a certain range, and is basically not affected by the change of the input voltage, so the secondary coil is The induced electromotive force remains unchanged. In this case, the primary input current only acts as a supplemental energy.
Characteristics
1. Strong anti-interference ability, common mode rejection ≥50dB, can eliminate grid clutter, sine wave or method waveform
2. The output neutral line can be directly connected to the ground wire because there is no power connection between the output and the input.
3. Suppressing harmonics: It has obvious inhibitory effect on 3rd to 7th harmonics, especially for the third harmonic elimination rate of 90[[%]] or higher.
4. The working components are only transformers and capacitors, and the reliability of the whole machine is extremely high.
5. When the output voltage drops to zero during overload or short circuit, it will automatically limit current, which is 1.5 times to 2.5 times of the rated value. After the fault is eliminated, it will automatically recover and the regulated power supply will not be damaged.
principle
The output voltage of the constant voltage transformer is only related to the magnetic performance parameters of the core and the cross-sectional area of ​​the core, regardless of the primary and secondary turns ratio.
The efficiency and volume weight of the constant voltage transformer are similar to those of ordinary transformers. When the core material is better, the output voltage changes less than 1.5 [%] when the mains voltage changes from 160 to 250 volts; when the load current is from full load to halved When the output voltage changes by about 1.5-4 [%], when the output is short-circuited, the output current rises by about 1 time, so it is not afraid of a short circuit for a long time.
Conditions of Use
1. The altitude is not more than 1000 meters, and the surrounding medium temperature is not higher than 40 °C, not lower than -40 °C. When the above normal use conditions are exceeded, the corresponding quota adjustment shall be made according to the national standard GB6450-86.
2. The relative humidity of the air is not more than 85 [%] (when the temperature is 20 °C ± 5 °C).
3. Locations where there is no severe vibration and bumps and the vertical inclination does not exceed 5 °C.
4. There is no conductive dust and a corrosive gas or vapor site that is sufficient to destroy metal and insulation.
5. A place where fire, explosion or danger cannot occur.
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