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One to two secondary frequency furnace working principle
The operation mode adopts one to two, one to two, that is, one set of rectification power supply drives two sets of inverter devices to operate,
Operate separately with any set of inverters, and supply power to A or B furnaces.
Suitable for large-scale continuous production operation of small and medium-sized castings, high-power melting operation of any electric furnace, another furnace
The body can be insulated or the cold material can be preheated, the power can be arbitrarily distributed as needed, and the total power of the two electric furnaces is constant.
That is, the total power P total = PA + PB
The two electric furnaces are continuously alternately melted and insulated for simultaneous operation, so that the power supply can always be operated at full power.
In order to increase the melting productivity of the electric furnace, FIG. 3 is a block diagram of one to two.
One to two circuit block diagram
When the series inverter power supply is working, the rectification always works under the condition of full conduction, changing the output power of the inverter circuit.
It is realized by controlling the inverter trigger pulse frequency. And the load current is sine wave, so the series inverter power supply
There will be no high-order harmonics that seriously pollute the power grid and have a high power factor. Parallel inverter is impossible to achieve one
Dynamic power adjustment operation, because parallel inverter power supply adjustment can only be achieved by adjusting the rectifier bridge output voltage, when parallel
When the inverter rectifier bridge works at a low voltage and the rectification conduction angle is small, the power factor of the device will be very low.
And the parallel inverter load current is a square wave, which will seriously pollute the power grid. If you adjust the inverter back pressure angle to adjust the power,
The power adjustment range is very narrow, so the parallel inverter power supply cannot achieve one-to-two operation.
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