Mr. Jay. Puranik, Nashik, India

Dear All,

Thanks a lot for your quick response.

Presently, we can think of only the Lead-Acid Battery Charger in first phase.

The Lithium-Ion Battery Charger can be thought of in the second phase.

In our case, there will be Four Standard Batteries, EACH of Nominal 12 Volts DC, connected in a Single Series String (Circuit) for the effective end-to-end Nominal Voltage of 48 Volts DC, to power the BLDC Motor of Electric Auto-Rickshaw.

 The Charger is meant for the Battery of 100 Amp-Hour to 150 Amp-Hour Capacities.

 I am trying to find the similar but more precise charging requirements for the Re-chargeable Lithium-Ion Battery (Stack) of basically the same specification of Nominal 48 V DC and the same / similar Amp-Hour Capacities.

 To the best of my knowledge and understanding, there are as yet, no Indian Manufacturers of Re-chargeable Lithium-Ion (Li-I) Battery Manufacturers. These Batteries are presently getting imported from China from different manufacturers and therefore, those Batteries having different specifications and algorithms for charging.

 I am also trying to find any authentic (Govt. of India?) Document for the Battery Chargers for E-Rickshaws. In case, you are able to locate any such document, I request you to please share the same with me.

 So, please do consider with my specifications as Phase-1 for L-A Batteries and we will later take-up Phase-2 for the Li-I Batteries, once we have accurate and authentic information on the Charging for Li-I batteries.

T.I. has the dedicated ICs for L-A Battery Chemistry.

The Charger IC actually does NOT know the actual Battery Voltage nor the Battery Charging Current.

All the IC does is, take the feedbacks and apply the Control Signal to the Power Switch (MOSFET), as a Switching Regulator.

 My understanding is, the L-A Battery Charging Characteristic remains the same irrespective of 12 V or 48 V Nominal Battery.

 So, is it not possible to scale appropriately the DC Voltage Feedback and the DC Current Feedback Signals for the 48 V / 15 Amp System as if these are from a 12 V / say 2 Amps L-A Battery, as long as my Magnetics (Inductor) and the Power Switch is suitable for operating at 65 V DC and able to source 15 Amps DC to the Battery Bank?

I trust, you may want have a new thinking and the possibility of my using T.I. Products to manufacture this 1000 Watt CV-CC-CV Battery Charger which is actually going to be a Programmable DC Output Voltage and Programmable DC Output Current, in fact, Current-Limit, DC Power Supply?

My Micro-Controller in that case can do the set-point control and feedbacks measurements and monitoring for a close-loop implementations, if an ASIC based L-A Battery Charger for the required ratings is NOT feasible.

You may then advise me on the low-cost solution for AC-to-DC Power Controller with adjustable set-points for Output Voltage and Output Current. The Charging Characteristics will be handled by me in my firmware.

Sorry to trouble you again, but I thought, T.I. being a Leader in the Fields of not only Power Controls but also in Battery Charger Technologies & Solutions, I will have the solutions.

May I request you to please have a look at the Old Document of Year 2009, PRD1404 for 48 Volts, 600 Watt, as a Wide Input Range, Full Bridge, Phase-Shifted Topology, DC-to-DC Converter? I am sure, T.I. would have something better to offer me.

I trust, I have clarified my requirements and objective more clearly now.

Kindly do spare your valuable time and please do respond to me positively once again.

Thanks & with best regards, - Jay.