Comparison of parallel and series circuits used in intermediate frequency power supplies

project		Type of IF power supply
project		(a) Parallel type	(b) Tandem type	(c) Series and parallel
Output voltage waveform		Sine wave	Rectangular wave	Sine wave
Output current waveform		Rectangular wave	Sine wave	Sine wave
Fundamental voltage of induction coil		Inverter output voltage	Q×Inverter output voltage	Inverter output voltage
Fundamental current of induction coil		Q×Inverter output current	Inverter output current	Q×Inverter output current
DC filter link		Large reactance	Large capacitance	Large capacitance
Anti-parallel diode		Need not	use	use
Thyristor	du/dt	small	Big	small
Thyristor	di/dt	Big	small	generally
Impact of commutation overlap		Series reactance and distributed inductance cause commutation overlap	without	without
Protection against commutation failure		easy	difficulty	difficulty
Add-on		few	generally	many
Exchange efficiency		High (about 95%)	Fair (about 90%)	Low (about 86%)
Stability of operation		Stable in a large range	Poor adaptability to load changes	Difficulty in manufacturing devices below 1000HZ
energy saving effect		good	generally	Difference