Intelligent MOSFET based DC Protection

[sonnya]

Hello DIY friends.

New prices

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)

2 modules are used for Stereo.
The prices in € excluding VAT and Shipping:

We have recalculated the based on hopefully larger quantity

SSR DC protection w/o current sensor: 38.75€/pcs

SSR DC protection with current sensor: 48,75€/pcs

 

[ben123]

Does your Current limiter also protect from shorted speaker wires?

 

[sonnya]

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.

 

[sonnya]

Early bird:

Ganck - 2 pcs

 

[sonnya]

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

 

[vitalica]

vitalica - 2 pcs

 

[sonnya]

Early bird:

Ganck - 2 pcs (Paid) (Testing)
Vitalica - 2 pcs

 

[sonnya]

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.

 

[Myint67]

Hi sonny ,
Pls let me know special price for V4 user ?
Nice for no extra power need it .

Best
Myint

 

[sonnya]

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

 

[andrewlebon]

Nice product Sonnya

warm regards
Andrew

 

[Myint67]

Ganck - 2 pcs (Paid) (Testing)
Vitalica - 2 pcs
Myint 67 -2pcs or 4 pcs confirm later

Ps price is including v4 to DC protection power conector pin ?

Thanks

 

[sonnya]

A scope shot from the current limiter in action.

The yellow trace is the output.
Green trace is the input.

As seen on the picture it cuts fast, There are some ringing for 20uSec but is due to the mosfet output capacitance reacting with the inductance of the wires and the very low speaker resistance (0.5R) forming an series resonator.

The current limit settings is 9.3A, 14A, 18A, 28A, 56A, 136A.

All tests is now done and shipping is on its way.

 

[sonnya]

Ganck - 2 pcs (Paid) (Testing) (shipped)
Vitalica - 2 pcs
Myint 67 -2pcs or 4 pcs confirm later

Ps price is including v4 to DC protection power conector pin ?

Thanks

It will include the DC power cable for the V4.

 

[sonnya]

Ganck - 2 pcs (Paid) (Testing) (shipped)
Vitalica - 2 pcs (Paid) (Testing)
Myint 67 -2pcs or 4 pcs confirm later

 

[sonnya]

Manual for DC protection module:

 

[rogerchou]

Hi Sonny,
For J6 power connector, should I also connect J6-3 to V4 control board or just connect J6-1(V+),J6-2(GND) and J6-5(V-) to V4 control board?

 

[sonnya]

Just use the cables I have send with the module.

And it is correct that there are 1 pin that is not wired through


Sent from my iPhone using Tapatalk

 

[sonnya]

We have new prices on the DC protection boards.

Go to the first post to see the prices.