Comparison of advantages and disadvantages of series inverter power supply and parallel inverter power supply:

1. Main components and standards
Serial number	name	Series resonant inverter intermediate frequency power supply	Parallel resonance inverter intermediate frequency power supply
1	Power Factor	Constant power factor 0.98	The power factor is 0.7-0.92, if the average power factor does not reach 0.90, the Electric Power Bureau will pay a fine
2	Melting power consumption	550±5% kW.h/t (1600℃)	≤620±5% kW.h/t (1600℃)
3	Resonance method	Voltage resonance, low line loss (copper bar and furnace ring)	Current resonance, line (copper bar and furnace ring) loss is large
4	harmonic	Low harmonics, low pollution to the power grid	High harmonics, great pollution to the power grid
5	Startup success rate	The power is adjusted by adjusting the frequency of the inverter, so the startup rate is high. 100% startup success rate	It is difficult to start the device under heavy load
6	efficient	High efficiency can be 10%-20% higher than parallel power supply	Low efficiency due to low power factor and high harmonic pollution
7	Easy to use	Series resonant power supply can realize one-to-one, one-to-two, one-to-three working modes	Parallel resonant power supplies can only achieve one-to-one working mode.
8	protect	Complete protection function	Relatively complete protection functions
9	Material costs	The material cost is high, the rectifier increases the filter capacitor, and the voltage resonance component parameters are selected with high values	The material cost is low, the rectifier does not need to increase the filter capacitor, and the current resonance component parameters are selected with low values

Description: 1. Power factor

The series resonance power factor is high: ≥0.98, because all the thyristors of the rectifier part of the power supply are in a fully open state, and the rectifier circuit is always in a fully conductive state. The power increase is achieved by adjusting the voltage of the series inverter bridge. Therefore, in the entire operation process (including low power, medium power, high power) can ensure that the equipment has been in the high efficiency stage.

Parallel resonance power factor is low: ≤0.92, because all the thyristors of the rectifier part of the power supply are in a semi-open state (additional compensation is required according to the requirements of the national grid). , The power factor of the power system is very low, generally 40%-80%; the higher harmonics are very large, which seriously interferes with the power grid.

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