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The simplest way to drive the module is with a constant current. In this application, a
TPS54201-Q1 was used to supply a constant current. Although it is a switcher, the output filter
provides a near constant current source with only marginal ripple.

2000 Hz or higher

Код: Выделить всё • Развернуть

Питание термоэлектрических модулей (ТЭМ) должно осуществляется от источника постоянного тока.
Для эффективной работы модуля рекомендуется, чтобы уровень пульсаций тока не превышал 5% (максимально допустимый уровень - 10%).

After this month of aging, the efficiency tests were performed again and showed no performance difference. The observed loss of efficiency actually corresponded to the degradation of the thermal paste (which permits to improve the thermal bonding) between the Peltier module and the temperature sensors.
The same test was then performed four months afterward. The following are the results:
• PWM current: The ΔT between the cold side and the ambient temperature does not change. The
results stay the same over the time.
• Linear current: The ΔT between the cold side remains the exact same.

5 Conclusion
Moreover, constant current drive is definitively preferred over PWM drive. If the design requires the ability to reverse polarity, the full bridge is the most flexible option but it significantly reduces the efficiency. The buck boost TPS63020 is an alternative. Finally, testing for five months continuously (3600 hours) does not seem to have any significant measurable performance influence.

Начинающий, как говориться "а ты не превышай".

Начинающий писал(а):Мне думается, что вы получите не постоянное а переменное напряжение, да еще и с большими бросками

Начинающий писал(а):Но ведь там целый фильтр нижних частот на LC контуре юзают а не голый дроссель, потому и написал.

setar писал(а):Во всех вышеприведенных документах нет главного - исследования влияния применения ШИМ на срок службы элемента пельтье в часах.

During five months, two
Peltier modules with the same efficiency performances were continuously submitted to a constant current
drive of 1.4 A. One Peltier module was with PWM current, and the other one was with constant current
...
After this month of aging, the efficiency tests were performed again and showed no performance
difference. The observed loss of efficiency actually corresponded to the degradation of the thermal paste
(which permits to improve the thermal bonding) between the Peltier module and the temperature sensors.
The same test was then performed four months afterward. The following are the results:
• PWM current: The ΔT between the cold side and the ambient temperature does not change. The
results stay the same over the time.
• Linear current: The ΔT between the cold side remains the exact same.

Dmitry__ писал(а):Поэтому достаточно одного дросселя...

Myp писал(а):Если взять модуль эдак на 10 ампер да шим например 10%, какой там дроссель нужен, с ручками для переноски?