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coils for wireless charging bq500210

October 27, 2016, 4:43 am
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I am currently using BQ500210EVM -689 (760308101 coil) and designing the different receivers with your coils. I am using bq51013 and bq51050 Texas instruments chips. I tested 760308201 and 760308101303 coils and the receiver works fine but with 760308103206 and 760308101208 coils it did not work, you also stated this in mix and match.
 
My idea is to change the transmitter coil to let's say 760308100110 or 760308111 in order to use 760308103206, 760308101220,...
 
Please advise me whether this could work with bq500210, just to change the coils or do I have to make more changes?
 
Thanks in advance!
 Sneza
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BQ51050B Problem C1, C2?

October 27, 2016, 8:05 am
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Hello,

I've a problem with the BQ51050B it won't really work in this schematic and I don't know whats wrong.

Maybe I missed something or did a wrong calulation of C1, C2?

I'm using this coil.

[Calc] C1: 44,928822nF

[Calc] C2: 0,539145871


Best Regards

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BQ501210EVM-756 Gerber Files

October 27, 2016, 8:43 am
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Hello All,

The user guide states that Gerber files are available for download from the EVM product folder (bq501210EVM-756).

But it’s not there.  Can you provide this file/s?

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BQ51221 Consortium licensing

October 31, 2016, 1:32 pm
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Looking at the BQ51221 for a project and I was wondering if we would need to join either WPC or PMA to use their protocols? It's for an industrial application, so the numbers are maybe 1000 units per year.

Tony

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Ls' Measurement

November 3, 2016, 3:41 am
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Dear TI Technical team

                     I am working on Tx- 500210EVM-689 Tx and 51013 BqEVM -764 Rx boards  . I have some questions to verify my procedure of measuring leakage inductance . Please correct my procedure  if it is wrong :


1. To measure leakage inductance i attach the LCR meter (setting on 1V , 100Khz ) to the Rx coils and place the shorted terminal  Tx coil (WE760308110, 24µH) under it at the distance of 3.4mm while to coils are approximately aligned (concentric) the LCR  meter gives the values of leakage inductance . is it the right procedure to measure leakage inductance , i removed the plastic case on the Tx board .

2. My second concern is can i say this value as leakage inductance of Rx coil  or its a sum of Leakage inductance of Rx (L12 ) and the parallel equivalent of magnetic in (Lm) and the leakage inductance of Tx(L21) coil as it will not be negligible in this case so it can't be neglected .

3 . I am interested to know the Rx coils possible geometrical changes   (rectangular , oval radius variations  ) for a circular Tx -coil inorder to get  power transfer .Is there  any document in which geometrical aspects of a Rx coils discussed in detail W.r.t Tx coil .

Thanks .  

S.Raza

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is there any NTC calculator for finding out R1 and R2 for BQ51013b.

November 4, 2016, 2:08 am
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when i calculate seeing the given equations i do not get right answers. 

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What is Tj(OFF) on the BQ51013A?

November 8, 2016, 5:47 am
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On page 31 of the BQ51013A datasheet, under the "Thermal Protection" section, there is a reference to a parameter called "Tj(OFF)".  That is the only place where that parameter shows up, and I cannot find a value for it in the datasheet.

What is the value for Tj(OFF) on the BQ51013A?

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I have some question about tida-00329 with bq51051B

November 10, 2016, 1:57 am
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hello I'm try to make tida-00329 design with bq51051b.

above is my circuit diagram and it's working

but, what i want to do is monitor status with diode. 

1. is it ok to connect diode between BAT and ~CHG pin? what value of resistor preferred? 

2. Power receiving distance

tida-00329 works with coil wr22230-26m8, power transfer(coupling) distance is about 1~2mm I think.

is there any possible way to longer this distance? about 4mm?

possibly fixed resonant frequency of receiving can boast distance?

or shape and size of each coil(transfer, receiver) can longer the transferring distance?

and also i want to know about self-resonance method used in tida-00329 is there any technical support about this?

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BQ51050B Charger with low power transfer

November 10, 2016, 3:18 am
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Hello,

I like to downgrade the standard "TIDA" design with the BQ51050B for a small 160mAh LiOn battery type RENATA ICP641620PA

with max. Iboost = 180mA and one of the WUERTH COILS WE760308101301 of 19 mm diameter or WE760308101220 of 17mm diameter.

As transmitter I have a standard Qi transmitter pad from WUERTH Model T20. Here is the circuitry:

I inspected Urect and Ubat with a Scope and Ibat with at Keythley multimeter.

Observation with Coil 1:

- I get very high rectification pulses of >5..10V if the coil is drawn onto the transmitter pad center. They repeat once a second and last

  then some tens of a second.

- Only when the coil is displaced to the corner so that only about 40% of the coil area is within the pad circle LED1 (CHG) is locking,

  Urect is going about 200mV above Ubat, BUT NO CHANGE IN CHARGING CURRENT OCCURS - the battery discharge even grows

  from -0.4µA to -4mA because of additionally sourcing LED1.

Questions:

1. Nowhere in the BQ51050B datasheet the role and size of Resistor "R1" is mentioned precisely? That is the resistor going from RECT to FOD?

2. Is the BQ51050B really intended for use with such small battery charge currents like that of the ICP641620PA of RENATA?

3. When LED1 is steadily lighting - why is no charging taking place?

4. How can I treat dimensioning to be able to put the coil onto the center of the transmitter pad?

Thank you for your approach and Best Regards           Markus

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BQ51050B for low power low size application

November 10, 2016, 5:16 am
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Hello,

I like to ask for some help  about to dimension the bq51050b circutry correctly: The design is like the input one of the "TIDA-00669" Reference Design with

an BQ51050B in use with a low size 160mAh battery of type RENATA ICP641620PA which has only a max. charge current of 180mA. Additionally the receiver

coils should be small and best of WUERTH type WE76038101303 with 19mm diameter or of type WE760308101220 with 17mm diameter.

The circuitry looks like this:

Observations:

I measured Urect, Ubat with a scope and Ibat with a Keithley multimeter. For the transmitter coil I used the standard WUERTH Qi transmitter pad of type T20.

- when placing coil 1 as in the circuitry in the center of the pad I see scope voltage pulses of Urect with 8..15V repeatedly every second and lasting

  some tens of a second. LED1 or !CHG is off

- when placing this coil at the border of the transmitter pad as such that only about 40% of the area of the coil is within the transmitter coil Urect sets

   correctly about 200..300mV above the Ubat~3.6V of the battery and LED1 is lighting, but the current measured through battery is not changing sign, but

   only rising from -0.4µA to -4mA because of additionally sourcing the LED1. I would then like to see about +180mA

Questions:

1. Is the selection of the design and chip chosen correctly for the situation with this small battery RENATA ICP641620PA? Should it not principally working?

2. Within the BQ51050B datasheet nothing is said about size and dimensioning of "R1", the resistor between RECT and FOD? What is the rule?

3. What other dimensionings could be altered to use the coils also in the center of the transmitter pad?

Thanks in Advance           Markus

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15W WPC Transmitter for Automotive

November 10, 2016, 5:17 am
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Hello Team,

Does TI have a WPC transmitter for automotive that can achieve 15W?

Thank you

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BQ51025 - EVM

November 10, 2016, 5:26 am
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Part Number: BQ51025

Application: Medical

Question type: Development and troubleshooting

Description of the problem: Hi,

I would like to know if bq51025 Evaluation Module contains a Coil, RX with Attractor (IWAS4832FEEB150J50 Vishay ) as stated in the BoM when we buy the EVM or do we need to buy it separately?

Thanks,
Regards,
Meria Jacob


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What can cause a fault on the BQ500210?

November 15, 2016, 7:22 am
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We have chargers built around the BQ500210 chip.  The devices being charged use the BQ51013 to rectify the wireless charging to 5V, which then gets run through an AAT3693 Lithium Ion charger controller chip.  I left a few devices in our chargers over the weekend, and when I came back to them today, both of the chargers where showing red on the LED, which means FAULT, according to the datasheet.

I couldn't find any information on what can cause faults.  What can cause a FAULT on the BQ500210?

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BQ51013BRHLR Not working

November 18, 2016, 8:27 am
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Hi, I have designed the BQ51013BRHLR on to a board for use as a battery charger power management device. Unfortunately the device seems to do nothing when the coil is placed on to a Qi transmitter. I am using an off the shelf Qi transmitter which I have tested with the BQ51013AEVM-765 eval kit. The coil is a IWAS3827ECEB100J50 and appears to work well with the eval kit. I have provided the schematics below. I am under great pressure to get this working and I can't see where to go next as the component does nothing?

The schematics are below with the following changes which were tried

R48 was changed to 20k
R46 was removed
C94 was changed to 1n8
C93 was changed to 68n
C86 was changed to 22n
C89 was changed to 22n

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How to calculate the efficiency of BQ500414

November 20, 2016, 9:49 pm
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Hello BQ experts,

How to calculate the efficiency of BQ500414 as the picture shown above?

Best regards

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FOD Calibration

November 21, 2016, 6:49 am
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Hi,

I've build a complete solution, Rx and Tx based on ;

Rx : BQ51050B

Tx : BQ50002 + BQ500511

During developpement, I've removed FOD functionnality (Tx side) by linking FOD_THR pin (BQ500511) to 3V3.

Now it's working, how to calibrate FOD ? I've find a GUI for BQ51050 but not relevant because impossible to be mis aligned in my case : my device(Tx) can only charge his battery on my charger (Rx). Coils are always aligned by mechanical design, impossible to be 5mm on left or right.

Thanks for your help, method, to determine resistors needed for FOD_THR value in my case, how to estimate transmitted power, etc....

Best regards

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BQ500212A and BQ51051B : charge current is about half the expected current

November 24, 2016, 12:48 am
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Dear all,


I am testing my wireless charger with BQ500212A and BQ51051B. The battery can be charged but its charge current is not what I expect.


If I understand correctly, the charge current is set by the sum of resistors R1 and Rfod (that are called Rlim). Then, Icharge = 314 A*ohm / Rlim. The Rfod is 200 ohm and I tried to have R1 = 470 ohm and 330 ohm that gives for Rlim 670 and 530 ohm. So I expected the following current :


- with 670 ohm : 314/670 = 469 mA and I got only about 220mA

- with 530 ohm : 314/530 = 592 mA and I got only about 265mA


I saw that JEITA specicification gives only half the current if the temperature is too cold or hot which could have been the answer to my question... but I measured the TS/CTRL pin and I got about 800mV during the 24 ms of TS measurement which is 0.8/2.2 = 36% of Vtsb. This value is between 19.6% and 47.8% and if I understand correctly, it means the temperature is normal...

Since I do not find any information about the Ros resistor (between RECT and FOD), I put 1 kOhm.

What value should I put for this resistor?

Anyone has an idea about my current charge issue?

Thank you in advance,

Best,

Christian

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BQ500212A Problems while charger changes the mode form current to voltage charging

November 24, 2016, 5:15 am
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We expected that the charger will load in current mode till 4.2V and then change to voltage mode to finish the charging. But as you can see below the change of the modes is already at 4.05V and then the charger makes some strange stuff till 4.2V.

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IS BQ51013B can replace BQ51003 without any modification ?

November 24, 2016, 6:52 am
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Hello,

at start i was thinking to use the BQ51003 in my design. So this part of my design was mainly inspired from TIDA-0668.

Finally, we can't use this bga footprint, so i am planning to put the BQ51013B in my design. Can i simply replace the BQ51003 by the BQ51013B ? parameter seems equivalent bettwen these 2 uc, so i don't need to modify any other component value ?

Thanks for your help.

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BQ51013B: EN1&EN2 vs TS/CTRL pin to send ETC.

November 24, 2016, 6:56 am
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Hello,

i see that to end properly the wireless charging process, the ETC paquet is send.

it seems that they are two way to drive this behaviour on BQ51013B or BQ51003 .

 Put EN1/EN2 to 10 or 11.

Use CTRL pin.

What is the bettre method ?

DOes i need to connect my CPU to EN1 or CTRL or both ?

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