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Old 17th July 2015, 11:11 AM   #1
sonnya is offline sonnya  Denmark
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Default Intelligent MOSFET based DC Protection

Hello DIY friends.

We have designed an Mono DC Protection for speakers to install in amps.

Basicly it is an Mosfet based SSR switch but we have packed some features into the 70x70x27mm (WxLxH) board.
  • 100Vpeak and 100Apeak for SSR Switch
  • Undervoltage lockout +/-20VDC
  • DC offset protection 0.5VDC -3dB @ 1.5Hz
  • Current limiter up to 100A. 16 selectable steps through Dipswitch
  • Current limiter is non intrusive, it uses an hall sensor
  • Current sensor has an bandwidth of 90KHz, to catch any overcurrent immediately
  • LED status output to signal error
  • Reset input to reactivate SSR switch
  • +/-75VDC supply voltage
  • Board size is 70x70x27mm (WxLxH)

Buyers of TSSA V4 and V8 will get additional discount to the prices below.

2 modules are used for Stereo.

First modules will ship in week 31. Early bird runs until week 31.

Early bird price is 65€/module
Normal price is 75€/module
Attached Images
File Type: jpg DC protection.jpg (362.5 KB, 391 views)
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Last edited by sonnya; 17th July 2015 at 11:17 AM.
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Old 17th July 2015, 12:05 PM   #2
ben123 is offline ben123  Belgium
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Does your Current limiter also protect from shorted speaker wires?
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Old 17th July 2015, 12:11 PM   #3
sonnya is offline sonnya  Denmark
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It depends on the margin that you set the current limit at compared to the current capacity of the amplifier.

The time-constant of the current detecting HALL element is 12uSec. So you should be able to prevent an damage of the amp.

But i would set the current limit 20% lower than the capacity of the amplifier, to have some margin to play on....

The DC protection module remains off when encountering an over-current. You can release it again with an switch connected to the reset input.
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Old 22nd July 2015, 10:57 AM   #4
sonnya is offline sonnya  Denmark
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Early bird:

Ganck - 2 pcs
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Old 5th August 2015, 08:34 AM   #5
sonnya is offline sonnya  Denmark
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Early bird:

Ganck - 2 pcs (Paid) (Testing)

The modules are 70x70mm.

Spacers between mounting plate and PCB should be 5mm. The two mosfets needs to be mounted on the plate with thermal conductive isolation pads.

Total height of the modules above mounting plate is 33mm
Attached Images
File Type: jpg image1.jpg (110.3 KB, 239 views)
File Type: jpg image2.jpg (86.7 KB, 231 views)
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Old 6th August 2015, 12:51 PM   #6
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vitalica - 2 pcs
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Old 6th August 2015, 07:21 PM   #7
sonnya is offline sonnya  Denmark
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Early bird:

Ganck - 2 pcs (Paid) (Testing)
Vitalica - 2 pcs
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Old 7th August 2015, 09:09 AM   #8
sonnya is offline sonnya  Denmark
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Default How to connect DC protection to TSSA V2, V4 and V8

On the picture it is shown how to connect the DC protection module to the TSSA V2, V4 and V8 amplifier.

It is very simple, there is no need for external power as they are feed from the amplifier modules.

Undervoltage lockout is at +/-14VDC - Blink 0.2/1sec
DC lockout is at +/-600mVDC - Blink 1/1sec
Current Limit lockout is at +/-600mVDC - Blink .3/.3sec

Undervoltage and DC lockout recovery is 1 sec.

Current Limit lockout can only recover by shorting pin 3 and 4 on J8 connector after that the SSR will recover after 1 sec.
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File Type: jpg IMG_1777.JPG (257.8 KB, 163 views)
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Old 8th August 2015, 01:44 AM   #9
Myint67 is offline Myint67  Singapore
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Hi sonny ,
Pls let me know special price for V4 user ?
Nice for no extra power need it .

Best
Myint
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Old 8th August 2015, 05:46 AM   #10
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Myint67 View Post
Hi sonny ,
Pls let me know special price for V4 user ?
Nice for no extra power need it .

Best
Myint
For DC Protection with current limiter for TSSA V1.8 owners the price is 56€

For DC Protection with current limiter for TSSA V2/V4 and V8 owners the price is 56€

TSSA V2/V4 and V8 has an build in current limiter. This is not the case for TSSA V1.8

For DC Protection without current limiter for TSSA V2/V4 and V8 owners the price is 51.40€

For all other buyers:

with Current Limiter
Early bird price is 65€/module

Normal price is 75€/module

without Current Limiter
Early bird price is 60.40€/module

Normal price is 70.40€/module
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