[EVDL List]

Doesn't the ability of the MM PFC-xx to control input current depend on the pack voltage relative to AC line voltage?

For example is I am charging a 144v pack from 120v I thought the current knob defined max input current.

John

[quote] corbin dunn <xxx@xxx.xxx> wrote:

>
> On Aug 10, 2012, at 7:53 AM, tomw wrote:
>
>> Sounds cool Corbin! Should be able to integrate it into EVW's 10k charger.
>
> Yes, definitely! One thing I can't do with the Manzanita PFC-30 charger is control how many amps it is drawing. That's sort of unfortunate. I may look into getting/building the EVW charger at some point so I can have full control over things.
>
> corbin
>
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[EVDL List]

Hey Corbin, my comment was directed towards your design of a delay circuit
that would be used on a public charger. That's a NO NO. Like I said, some
locality's have a big fine and tow away after 4 hours. This time limit is
normal and will progress to all public chargers as more EV's use the
chargers, or cant because somebody left their car there all day.



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[EVDL List]

[quote]John O'Connor wrote:

> Doesn't the ability of the MM PFC-xx to control input current depend on
> the pack voltage relative to AC line voltage?
>
> For example is I am charging a 144v pack from 120v I thought the current
> knob defined max input current.

No. Consider your example.

Let's say you set the current knob such that you get 20A into your pack at the start of charge: 20A * 144V = 2.88kW. Neglecting losses due to charger inefficiency for the moment, 2.88kW / 120V = 24A input.

As your battery charges, the DC output voltage of the charger increases, but the input remains at 120VAC. If you charge to 2.4Vpc, then you expect to see 20A into the pack until the voltage reaches 173V. 20A x 173V = 3.46kW. Again neglecting losses, 3.46kW / 120V = 28.8A input.

Note that this example requires that you have at least a PFC-30, since for 20ADC output from 120VAC results in an input current greater than 20A. The PFC-xx chargers are limited to xx amps maximum on either the input or output, so if you set the current knob on a PFC-20 to allow 20A into the pack while plugged into 240VAC, you'll get the expected 20A, but if you then plug into 120VAC, you will see lower DC current as the charger limits the AC input draw to the 20A maximum allowed by the hardware.

Cheers,

Roger.


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[EVDL List]

[quote] John O'COnnor wrote:

> Doesn't the ability of the MM PFC-xx to control input current depend on the pack voltage relative to AC line voltage?
>
> For example is I am charging a 144v pack from 120v I thought the current knob defined max input current.

Yes, but there is no way to control it via some software input (ie: the 5 pin input doesn't have the ability to do this). I'd have to make some kind of mechanical thing that physically turns the dial with a servo (or something similar)

corbin

>
> John
>
> On Aug 10, 2012, at 11:51 AM, corbin dunn <xxx@xxx.xxx> wrote:
>
>>
>> On Aug 10, 2012, at 7:53 AM, tomw wrote:
>>
>>> Sounds cool Corbin! Should be able to integrate it into EVW's 10k charger.
>>
>> Yes, definitely! One thing I can't do with the Manzanita PFC-30 charger is control how many amps it is drawing. That's sort of unfortunate. I may look into getting/building the EVW charger at some point so I can have full control over things.
>>
>> corbin
>>
>> _______________________________________________
>> | Moratorium on drag racing discussion is in effect.
>> | Please take those discussions elsewhere. Thanks.
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>
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[EVDL List]

On Sat Aug 11 13:20:41 PDT 2012 xxx@xxx.xxx said:
>[quote] John O'COnnor wrote:
>
>> Doesn't the ability of the MM PFC-xx to control input current depend on the pack voltage relative to AC line voltage?
>>
>> For example is I am charging a 144v pack from 120v I thought the current knob defined max input current.
>
>Yes, but there is no way to control it via some software input (ie: the 5 pin input doesn't have the ability to do this). I'd have to make some kind of mechanical thing that physically turns the dial with a servo (or something similar)

Actually, if you can sense the AC current, you CAN control the power via the regbus connector.
One of my projects several years ago just did PWM on the regulator control line to control the output voltage. you could do the same to throttle back the power as needed.

--

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