# How to calculate the values of DC REACTOR for current source inverter power supply?

#### Hasan Farooq

Joined Aug 1, 2019
5
Im trying to build a full bridge inverter for induction heater.
It has a parallel resonance and power is controlled by changing phase angel of 3 phase input 380V.

I need to find what parameters are there to consider dc reactor values and how shall i put a suitable dc reactor ( iron cored ) in my system.

Im designing 100kw induction heater which has a resonance frequency of 2khz and i want a dc reactor in between SCR controlled rectifier and IGBT based inverter.

#### DickCappels

Joined Aug 21, 2008
10,247
Please post a schematic diagram of what you are planning to dnce the circuit and operating conditions are uderstood we should be able to make suggestions. Until then we would only be playing a guessing game.

Is it something like this (below)?

#### Alec_t

Joined Sep 17, 2013
14,417
What is a DC reactor? An inductor has zero reactance, just series resistance, for DC currents.

#### nsaspook

Joined Aug 27, 2009
13,590
What is a DC reactor? An inductor has zero reactance, just series resistance, for DC currents.
Exactly what you need for the AC component filter from a high power DC supply.

Link Choke would be the modern term for a DC reactor in this type of service.

#### Hasan Farooq

Joined Aug 1, 2019
5
Hello sir.
The circuit is just like this one.
We are using parallel resonance bank for the induction heater.
this one is for 300KW system and it has resonance frequency on full load is 2khz .
I need to find that how one can measure the dc reactor values ?
Like this one have 2.5mH on one pole.
Total for the complete circuit it is 5mH.

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#### Hasan Farooq

Joined Aug 1, 2019
5
Thats the actual picture of DC REACTOR for 300kw induction heater.

I want to learn that how we can find the values and there sizes for any required power.

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#### nsaspook

Joined Aug 27, 2009
13,590