Constant voltage transformer
The constant voltage transformer integrates voltage stabilization, isolation, and transformation. It has a two-way filtering function that can eliminate noise from the power grid. It has good anti-interference ability. The output is sine wave or quasi-square wave. It is an ideal stabilized power supply for precision electronic instruments, microcomputers and numerical control equipment. There is a “day”-shaped iron core in the constant voltage transformer, the primary coil is in one window, and the secondary coil and resonant coil are in the other window. The resonant coil is connected to a resonant circuit whose resonant frequency is close to the frequency of the power supply.
When the primary power supply is connected, the resonant circuit oscillates to shallowly saturate the secondary iron core and form a constant alternating magnetic field. The magnetic induction intensity is within a certain range and is basically not affected by the input voltage change. The induced electromotive force remains unchanged. In this case, the primary input current only plays a role in supplementing energy.
Features
1. Strong anti-interference ability, common mode suppression ¡Ý50dB, can eliminate grid clutter, it is sine wave or method waveform
2. The output neutral wire can be directly connected to the earth wire, because there is no electrical connection between the output and the input.
3. Inhibition of harmonics: it has obvious inhibition effect on the 3rd to 7th harmonics, especially for the elimination rate of the third harmonics to be above 90[[%]]
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 when overload or short circuit, it will automatically limit the current, which is 1.5 to 2.5 times of the rated value. It will automatically recover after the fault is eliminated, and the stabilized 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 iron core and the cross-sectional area of ??the iron core, and has nothing to do with the primary to secondary turns ratio.
The efficiency, volume and weight of the constant voltage transformer are similar to those of ordinary transformers. When the core material is good, when the mains voltage changes between 160-250 volts, the output voltage changes less than 1.5[%]; when the load current changes from full load to half When the output voltage changes about 1.5-4[%], when the output is short-circuited, the output current rises by about 1 times, so it is not afraid of long-term short-circuit.