74 Electric Vehicle Power Supplies Converters by IOTA Engineering

74 Electric Vehicle Power Supplies Converters by IOTA Engineering

May 12, 2011

Due to design changes, the current production DLS-15, DLS-30,

DLS-45 & DLS-55 battery chargers can only accept 120 volt a.c.

They can no longer accept d.c. voltages.

IOTA is working on a line of dedicated chargers/power supplies that

will accept a d.c. input.

We will keep you updated on any word we hear from IOTA.

sincerely,

John

Electric Vehicle use with the 120 volt a.c. input DLS battery chargers.

Many ev (electric vehicle) owners have been looking for a way to charge 12 volt d.c.

batteries from their high voltage vehicle battery bank as well as to power

12 volt d.c. loads.

The following is from IOTA Engineering regarding using the DLS battery chargers from

a high voltage direct current source.

The first is in reference to using the standard 120 volt a.c. input DLS chargers and

the second regards using the 220 volt a.c. input chargers:

From: Jeff Young [mailto:jyoung@iotaengineering.com]

Sent: Wednesday, January 17, 2007 2:26 PM

To: Mariette Francis

Subject: Re: question [DC operation of DLS units]

The DLS-45 and DLS-55 will not produce full output power with less than 130Vdc on the input and

will be limited to an output voltage of 13.6Vdc; an increase of the input voltage (to 136Vdc) would be

required to attain full output power with the DV (dual voltage) jack installed.

The DLS-45 and DLS-55 will operate at less than 130Vdc, but at a limited capability. At 96Vdc,

the output will remain in regulation up to ~½ Adc. Above ~½ Adc load, the output voltage will decrease

linearly until the load current reaches ~1Adc (Vout = ~10Vdc). Above 1Adc, the output should maintain

an output voltage of 9 -10Vdc.

The DLS-30 (Series M) also has limited operation at lower input voltages. At 96Vdc, the Series M can

sustain normal float voltages out to ~20Adc.

Above 20Adc, the output voltage decreases linearly to ~10Vdc at 30A output.

Jeff Young - Power Products Engineer

jyoung@iotaengineering.com

IOTA Engineering, L.L.C.

Tel - 520-294-3292

Fax - 520-573-2934

As of today, 1/24/07, John Kehm told me on the telephone that the highest d.c. input voltage

for the DLS-30M, DLS-45 and DLS-55 is 190 volt d.c.

Electric Vehicle use with the 220 volt a.c. input DLS battery chargers.

From: Jeff Young [mailto:jyoung@iotaengineering.com]

Sent: Tuesday, November 06, 2007 2:21 PM

To: John Kehm

Cc: dbull@iotaengineering.com

Subject: Re: Driving DLS units off 288 - 312Vdc... and other tech questions

Responses to the questions below concerning our model DLS 220-55....

1) The unit should have no problem in the range of 260 Vdc to 340 Vdc.

2) Hard-tie parallel is no problem without IQ4 (smart charge option; boost, soak & float);

special parallel IQ4 available for two units in parallel.

3) There will be no delay in the response of the power supply to a 50A dynamic load.

The design is switchmode, operates above the normal audio range, and employs closed loop feedback

(type 1) for output voltage regulation. The response of the power supply depends on the rate-of-change

of the dynamic load (di/dt); transient loading slower than 100A/mSec (100,000 A/Sec) will provide minimal

effect on the output voltage.

4) As long as the input remains within the range of 260 Vdc to 340 Vdc, disturbances on the input will

have minimal effect on the output voltage. The enhanced audiosusceptibility results from the large input

filter and the closed loop regulation of the output voltage.

IOTA DOES NOT RECOMMEND SERIES CONNECTION OF EITHER INPUTS OR OUTPUTS OF

THE DLS SERIES POWER SUPPLIES.

Paralleling inputs and outputs is acceptable.

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