I'm making a fermentation chamber using a Peltier element (TEC1-12706). As recommended by the data-sheet (\$V_{max} = 14.4 V, I_{max} = 6.4 A\$), I'm using a 12V/3A 4 kHz PWM power supply.

I want to smooth/filter PWM output (e.g., RC circuit) so as to increase the lifetime of the Peltier element. The problem is that I also need to reverse the current direction (for fast heating & fast cooling).

How can this be done?

  • \$\begingroup\$ Check out H-bridge. \$\endgroup\$ – Dmitry Grigoryev Jun 28 '17 at 14:58

You probably want to use an LR, with RC you'll have quite some losses. Have a look at all those class D amplifier output stages, you should have no trouble with reversing as far as the filtering goes. Of course you'll need an H-bridge to reverse your peltier. You might want to look at some of the popular motor drivers.

  • 1
    \$\begingroup\$ PWM + LC = buck converter. \$\endgroup\$ – winny Jun 21 '17 at 16:58
  • \$\begingroup\$ Your statement is necessary but not sufficient. \$\endgroup\$ – wiebel Jun 21 '17 at 17:02

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