unregulated output using ICE5QR1680 for universal solar motor controller for both 5and 7.5Hp rating motor.

Announcements

From sunburn to sun earn – we’ve got the power! Watch our #poweringgreen videos now.

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
ShV_1494181
Level 1
Level 1
5 sign-ins First question asked Welcome!

the customer is using the design on the above coolset IC, and has shared problem faced by him:

---------"

Input—200-800VDC

Output---3 phase AC

Output Power:- 5 & 7.5Hp rating motor

Switching 20~ 100KHz

We have 4 Outputs on the secondary side.

  1.    5V / 1A   -        regulated (optocoupler feedback is from this voltage output)
  2.    7.5V / 0.3A      Isolated and unregulated
  3.    17.5V / 0.75A   Isolated and unregulated
  4.    24V / 0.6A       Isolated and unregulated

When we try to increase the load on the secondary the PWM Controller goes into reset mode as the Bias voltage exceeds 22V.

After this, instead of using diodes for rectification on the secondary on 17.5V and 24V we used synchronous rectification on their respective low sides. After this the performance was much better and the bias voltage reduced to 17.5-18V

Can you please guide us on how to resolve the issue and get the same performance without synchronous rectification."---------------------

0 Likes
1 Reply
Guruprasad_A
Moderator
Moderator
Moderator
25 likes received 250 sign-ins 50 solutions authored

Hi @ShV_1494181 
Thank you for contributing to the Infineon community.
Can you tell me more about the circuit?

a. Topology?

b. How are you generating Bias Voltage?

b. Any design you're using as a reference,

d. Circuit snapshot or block diagram for circuit analysis.

 

Regards,

Guruprasad A

0 Likes