Rectifier-Regulators, types & differences SH775 SH847 FH020, Shunt vs. Series

[whatnissan]

So this ended up working flawless btw.
[Seadoo 300 stator into 260 motor]

http://greenhulk.net/showthread.php?t=290993&p=3116546&viewfull=1#post3116546

My actual issue was a regulator issue.

But it plugs straight in to the regulator

[tiderider]

The stator can be tested multiple ways to rule out any issue with it. I always replace the stock regulators with a Japan made Mosfet voltage regulator. Not a china made one. The difference between a real mosfet and the stock shunt type is Day and Night.

[jetplane]

Where do you find out that regualtor mate ?

[tiderider]

Where do you find out that regualtor mate ?

This is what I use SHINDENGEN FH020AA REGULATOR 1D7-81960-00-00 GENUINE SHINDENGEN
Remember, made in Japan and NOT CHINA.
2 year warranty

SHINDENGEN FH020AA REGULATOR YAMAHA 1D7-81960-00-00 GENUINE SHINDENGEN | eBay

Item #360642763427 on ebay

[jetplane]

This is what I use SHINDENGEN FH020AA REGULATOR 1D7-81960-00-00 GENUINE SHINDENGEN

SHINDENGEN FH020AA REGULATOR YAMAHA 1D7-81960-00-00 GENUINE SHINDENGEN | eBay

Thank you mate! Just ordered , I don't want to melt the stator cable again .

[tiderider]

I've been running these voltage regulators for a while and I have NOT had 1 fail yet. Even with it powering the added load of an AFR sensor and module. VERY reliable.

[jetplane]

I've been running these voltage regulators for a while and I have NOT had 1 fail yet. Even with it powering the added load of an AFR sensor and module. VERY reliable.

This is what I'm looking for ! Thank you Mate!

[K447]

This is what I use
SHINDENGEN FH020AA REGULATOR 1D7-81960-00-00
GENUINE SHINDENGEN
Remember, made in Japan and NOT CHINA.
2 year warranty

SHINDENGEN FH020AA REGULATOR YAMAHA 1D7-81960-00-00 GENUINE SHINDENGEN | eBay

Item # 360642763427on ebay

- OTHERS USING YAMAHA 1D7-81960-00-00

If using this regulator for applications other than oem, for your reference the mounting center to center is 68mm to 70mm using 6mm bolts. the bolt center could be filed wider or an adapter plate could be made for other mounting applications.

Beware of the copies out there now being sold. They are substandard quality, made in China.

I sell genuine Shindengen quality only.
Note: Some of the Copies do not have metal on the back just black potting material.
Yamaha Part Number 1D7-81960-00-00

[tiderider]

Is this considered a hijack...

[K447]

Is this considered a hijack...

I found it interesting that the linked item specifically mentions Yamaha, along with related product info.

And that item included link to the kit version, which some might find useful.

[whatnissan]

that link didnt work for me care to post it again ? I might try one.

[K447]

- link - ?

eBay store MOTOELECTRIX

https://www.ebay.com/str/motoelectrix

Rectifier kit

https://www.ebay.com/itm/380704480069

[jetplane]

Hi all I just realized that my oem regulator is a mosfet type 32 ampere . Does make sense to upgrade with the 50 ampere one's?

[tiderider]

Hi all I just realized that my oem regulator is a mosfet type 32 ampere . Does make sense to upgrade with the 50 ampere one's?

SH is Shunt. FH is Mosfet. Your stock voltage regulator is a shunt type. Yes, replace your stock, shunt type for s FH, mosfet.

[K447]

MOSFET vs. SCR shunt type voltage regulators

Looking at the internal circuit designs, my understanding is that the Seadoo OEM voltage regulator SH775 is a series type [not the shunt type] using SCR diodes and power rectifying diodes in the high current circuit. There is some power loss and therefore heat generated by the power diodes and by SCRs as the series regulator operates.

In comparison the (SHINDENGEN FH020AA) MOSFET shunt type voltage regulator uses MOSFET transistors in the high current portion of the regulator. The rectifying diodes are probably Schottky type which have a smaller voltage loss and generate less heat than ‘regular’ power diodes. The MOSFET transistors each have much lower voltage loss than SCR devices and overall the MOSFETs will generate less heat.

I do not know why the SCR series regulator SH775 is sometimes mistaken as shunt type while the MOSFET FH020 regulator (which is a shunt design) is seemingly sometimes mis-understood as ‘not shunt’.

The electrical efficiency (inside the regulator) comes from the lower energy losses through each MOSFET vs. each SCR. The SCR type of regulator will produce more regulator module heat in normal operation, compared to MOSFET.

The amount of current flowing from each of the stator windings and through the three heavy stator wires (and the stator wire connector pins) feeding the regulator will be higher for shunt regulators using either SCR or MOSFETs. Maybe a tad more stator coil current flow with the MOSFET regulator, since there is less voltage loss across the MOSFETs.

As engine RPM rises the stator can deliver more coil current and the shunt will be active a larger percentage of the time. The SCR regulator will generate the most waste heat at whatever RPM (circa 8000?) the stator can generate the most current (amps). Same for the MOSFET regulator, just that the MOSFET regulator’s waste heat will be a fraction of the SCR heat output.

The SCR shunt regulator will generate the most heat when the battery is already fully charged and the engine is running at fairly high RPM. If a (not fully charged) battery needs a lot of charge current from the stator then the SCRs will be shunting less current and therefore producing less regulator heat.


The voltage regulation (in both SCR and MOSFET shunt versions) works by sensing regulator output/battery voltage rising slightly above the target voltage and immediately shunting (aka shorting) the stator winding’s outputs to ground, effectively allowing the stator coil output current to flow unimpeded in a tight loop through the regulator shunt, the stator coil windings, and the engine case (electrical ground).

When output voltage to the battery declines just enough for the regulator to allow the shunt to (re)open, the SCRs (or MOSFETs) cease shunting stator current and again the stator supplies charge current to the battery (through the diodes). This cycle repeats rapidly and endlessly as the engine runs, with the rapid shunt/no-shunt cycles averaging into a stable charge voltage into the battery. The MOSFET regulator has the potential to more tightly regulate the output voltage with more rapid cycling of the shunt.

http://mosfet-regulator.com/79_how-does-a-mosfet-regulator-work.html

Simplified shunt type SCR regulator circuit showing the six diodes and three SCR


Reference diagram for MOSFET type shunt regulator
Only three diodes plus three MOSFET transistors.