Leaf spring hardening by medium frequency induction heating power supply

For large-scale automobile leaf spring quenching, the hardness layer is required to be 3-5mm. It is recommended to use IGBT medium-frequency induction heating power supply. It is more appropriate to use intermediate frequency quenching for leaf spring quenching, which can meet good requirements in terms of hardness layer and uniformity.

Technical parameters of IGBT medium frequency induction heating power supply

Inverter part: The inverter adopts zero-voltage soft start mode, and is equipped with an automatic repeated start circuit, which can prevent the occasional start failure of the intermediate frequency power supply and improve the reliability of start. The inverter circuit adopts automatic frequency tracking technology to achieve 99% startup and the whole circuit is always in the resonance working state, which reduces the loss. The whole machine is divided into four parts: inverter part, rectifier part, operation protection, regulator circuit part and circuit.

Rectification part: The medium frequency induction heating power supply adopts full-bridge rectification without control for rectification, which saves a huge reactor, reduces the interference to the power grid, and improves the power factor.

Operation protection circuit part:

There are various operations and protection circuits in the control circuit, the power-on and power-off sequence of the main circuit and the control circuit, and the misoperation of the user will not have any impact on the system.

The specific protection functions of the medium frequency induction heating power supply are:

Phase loss protection, detect whether there is a phase loss in the three-phase AC input, if there is a phase loss, it will be protected immediately, and the machine will stop working.

Over-current protection, system over-current start-up protection, to prevent equipment from damaging power devices due to over-current.

Overvoltage protection, monitor the power supply voltage, and protect immediately when the power supply voltage is too high, effectively preventing power device damage.

Under-voltage protection, monitor the power supply voltage, and protect immediately when the power supply voltage is too low, effectively preventing power device damage.

Regulator circuit part:

The intermediate frequency current closed-loop PI regulator is used, and the closed-loop is always involved in the work during the startup process, so that the system works stably, and the phenomenon of current tripping rarely occurs during the system debugging process and when the inverter fails.