Principle Of Constant Voltage Transformer

The principle of Constant Voltage Transformer(CVT) is to achieve voltage stabilization based on the principle of ferromagnetic resonance.

There is a "日"-shaped iron core in the constant voltage transformer, the primary coil is in one window hole, and the secondary coil and the resonant coil are in another window hole. The resonant coil is connected to an external capacitor to form a resonant circuit with a resonant frequency close to the power frequency. When the primary power supply is turned on, the resonant circuit starts to oscillate, making the secondary iron core shallowly saturated, forming a constant alternating magnetic field. The magnetic induction intensity of this magnetic field is basically unaffected by the change of input voltage within a certain range, so the induced electromotive force of the secondary coil can remain unchanged. In this case, the primary input current mainly plays the role of replenishing energy.

The constant voltage transformer integrates voltage stabilization, isolation, and voltage transformation. It has a bidirectional filtering function, can eliminate grid clutter interference, has good anti-interference ability, and outputs two types of sine waves or quasi-square waves. It is an ideal voltage stabilization power supply for precision electronic instruments, microcomputers, CNC and other equipment.