Qlite Rev.A 7135*8 Multiple Modes Circuit Board 3.04A

DSC_3691 DSC_3693

DSC_3692 DSC_3694

Driver is from Intl-outdoor.com

Official specifications:

Group of modes:
1st Star : 2% - 25% - 100% (Default)
2nd Star : 5% - 30% - 100% - Strobe - Beacon
3rd Star : 15% - 100%
4th Star : 5mA - 2% - 25% - 100%

Group selection is done with solder bridges, 1st star has a bridge on the circuit board and never need a solder bridge.
DSC_4513


This driver exist in many versions, with the same hardware and different program in the processor (Atmel Tiny13A). These programs control the pwm frequency, the modes and the function of the stars. For the stars only 2, 3 and 4 are used, the first is only part of the design and is not really used. It also means that it is never necessary to add a solder blob or cut the trace connecting it to the ring.
The driver can also have more or less 7135 chips, this defines the (maximum) led current.



Measurements

Tested with: Cree XM-L2 led.
Diameter 17mm
Max. height: 4.7m
Modes no star: low, medium, high
Modes 2st star: low, medium, high, strobe, beacon
Modes 3st star: low, high
Modes 4st star: moonlight, low, medium, high
The mode set selection is done with solder bridges on the driver.
The driver has memory, the actual mode is stored when the light is off for a short time.
A short off/on will select next mode. The light must be off a few seconds to not select next mode when turned on.
Driver is a linear regulator.
Strobe 8.9 Hz, duty cycle 40%
Beacon, pulse width 34ms, repetition rate 4.8 sec
Pwm is 16.5 kHz
The driver flashes a number of times when the voltage is down to 2.80 volt, then it turns the led off.



The four modes banks had the same high mode, but medium and low varies between them.

As usual pulsing current (i.e. pwm) makes it difficult to calculate power and efficiency. In any modes except high I am calculating with a fixed led voltage, but due to the high pwm frequency it is not very precise.
Due to the high pwm frequency the power and efficiency calculations has large errors in the lower modes



High 1st star

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High mode works exactly as expected from a linear driver, efficiency goes up, when voltage goes down, until the driver goes out of regulation at 3.6 volt.
At 3.05 volt the driver reduces the led brightness and just above 2.8 volt the led is turned off.

Qlite%20Rev.A%207135x8%20HLDriver
Qlite%20Rev.A%207135x8%20HLLed

The green curve shows the average voltage across the led, below 3.05 volt it is reduced by the pwm.

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The driver does not disable pwm at high.



Medium 1st star

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Due to the fast pwm, the driver does not turn fully on. This makes the driver drop out of regulation at a fairly high voltage.

Qlite%20Rev.A%207135x8%20HL%20mediumDriver
Qlite%20Rev.A%207135x8%20HL%20mediumLed

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Due to the high pwm frequency, the curve it not square, but rounded.



Low 1st star

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In low mode the light is never in regulation.

Qlite%20Rev.A%207135x8%20HL%20lowDriver
Qlite%20Rev.A%207135x8%20HL%20lowLed

Qlite%20Rev.A%207135x8%20low

In low the pwm does not even turn fully on.



High 2st star

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Qlite%20Rev.A%207135x8%20HL%202Driver
Qlite%20Rev.A%207135x8%20HL%202Led


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Medium 2st star

Qlite%20Rev.A%207135x8%20HL%202%20medium
Qlite%20Rev.A%207135x8%20HL%202%20mediumDriver
Qlite%20Rev.A%207135x8%20HL%202%20mediumLed

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Low 2st star

Qlite%20Rev.A%207135x8%20HL%202%20low
Qlite%20Rev.A%207135x8%20HL%202%20lowDriver
Qlite%20Rev.A%207135x8%20HL%202%20lowLed

Qlite%20Rev.A%207135x8%202%20low



Strobe 2st star

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Strobe is 8.9 Hz with 40% duty cycle.



Beacon 2st star

Qlite%20Rev.A%207135x8%202%20beacon

Beacon uses puls width 34ms with dual flashes and a repetition rate of 4.8 sec.



High 3st star

Qlite%20Rev.A%207135x8%20HL%203
Qlite%20Rev.A%207135x8%20HL%203Driver
Qlite%20Rev.A%207135x8%20HL%203Led

Qlite%20Rev.A%207135x8%203%20high



Low 3st star

Qlite%20Rev.A%207135x8%20HL%203%20low
Qlite%20Rev.A%207135x8%20HL%203%20lowDriver
Qlite%20Rev.A%207135x8%20HL%203%20lowLed

Qlite%20Rev.A%207135x8%203%20low



High 4st star
Qlite%20Rev.A%207135x8%20HL%204
Qlite%20Rev.A%207135x8%20HL%204Driver
Qlite%20Rev.A%207135x8%20HL%204Led

Qlite%20Rev.A%207135x8%204%20high



Medium 4st star

Qlite%20Rev.A%207135x8%20HL%204%20medium
Qlite%20Rev.A%207135x8%20HL%204%20mediumDriver
Qlite%20Rev.A%207135x8%20HL%204%20mediumLed

Qlite%20Rev.A%207135x8%204%20medium



Low 4st star

Qlite%20Rev.A%207135x8%20HL%204%20low
Qlite%20Rev.A%207135x8%20HL%204%20lowDriver
Qlite%20Rev.A%207135x8%20HL%204%20lowLed

Qlite%20Rev.A%207135x8%204%20low



Moonlight 4st star

In this mode the current consumption is too low for my "input current" range. As can be seen on the curve it has a resolution of 1mA.

Qlite%20Rev.A%207135x8%20HL%204%20moonlight
Qlite%20Rev.A%207135x8%20HL%204%20moonlightDriver
Qlite%20Rev.A%207135x8%20HL%204%20moonlightLed

Qlite%20Rev.A%207135x8%204%20moonlight

The moonlight mode is simply the pwm at it minimum setting.

Mode4moonlight

Here i have zoomed in on the signals. The MP (microprocessor) gives a two micro second pulse out, but the 7135 is about 2 us (micro seconds) to turn on. This will give a very short pulse to the led and is also very sensitive to tolerances in the driver.
I.e. a 7135 needing 1.8 us to turn on will work perfectly, but one needing 2.0 us will not show any light. The slow turn on looks like it may be because the output from the MP cannot supply enough current for a fast turn on.



Conclusion

Due to the linear regulation in this driver it does only work in a limited voltage range. It is simple construction, that is easy to modify like adding more 7135 (increase led current) or remove some 7135 chips (Decrease led current).
The tested version of this driver has a very high pwm frequency, this does increase the loss in the driver a little bit.



Notes

How do I test a led driver
List of all tested drivers