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Comparison of advantages and disadvantages of induction furnace series resonant power supply and parallel resonant power supply:
project name | Series induction furnace | Parallel induction furnace |
Power factor
| High power factor:. ≥0 95, because the series rectifier intermediate frequency furnace of all SCR are in the fully open state | Low power factor:≤0 .92, because the rectifier and intermediate frequency furnace with all SCR are in a semi-open state (according to the national grid requirements need to add extra compensation)
|
Output voltage waveform | Rectangular wave
| Sine wave
|
Output current waveform
| Sine wave | Rectangular wave
|
Induction coil fundamental voltage
| Q× inverter output voltage
| Inverter output voltage
|
Induction coil fundamental current | Inverter output current
| Q× inverter output current
|
DC filter
| Large capacitance
| Large reactance
|
harmonic | Low harmonics, low pollution to the grid | High harmonics, large pollution to the power grid |
effectiveness | High efficiency can be 10%-20% higher than parallel power supply | Low efficiency because of low power factor and large harmonic pollution |
start up
| Startup success rate is 100% Because the series resonant power supply is frequency modulated, the power is adjusted by adjusting the frequency of the inverter, so the starting rate is high.
| Start success rate<100% It is difficult to start the device under heavy load conditions.
|
use
| Easy to use Series resonant power supply can realize one-to-one, one-to-two, one-to-three, and other working modes
| Inconvenient to use The parallel resonant power supply can only achieve one-to-one operation mode.
|
protection
| Complete protection Overcurrent protection, overvoltage protection, phase loss protection, high water temperature protection, low water temperature protection, high water pressure, low water pressure, etc.
| Complete protection Overcurrent protection, overvoltage protection, phase loss protection, high water temperature protection, low water temperature protection, high water pressure, low water pressure, etc.
|
Reliability
| High reliability Proven reliability exceeds parallel resonant power supply in field use
| High reliability The technology is more mature than the series resonant power supply. |
Equipment cost
| High equipment cost Because the tank current passes through the thyristor filter, it uses capacitive filtering.
| Low equipment cost
|
Energy saving
| 10% to 20% energy saving compared to parallel power supply
| Relative series is not energy efficient.
|
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