Temperature control device

Abstract

A temperature control device for controlling temperature of an object substance, the temperature control device includes: a pulse width modulator for changeably providing current directions of a providing current; a low pass filter; a Peltier device electrically connected to the pulse width modulator via the low pass filter; and a diode placed the low pass filter in parallel.

1 . A temperature control device for controlling temperature of an object substance, the temperature control device comprising:
 a pulse width modulator for changeably providing current directions of a providing current;   a first low pass filter;   a second low pass filter;   a Peltier device electrically connected to the pulse width modulator via the first low pass filter and the second low pass filter, the first low pass filter arranged between the pulse width modulator and the Peltier device, the second low pass filter arranged between the pulse width modulator and the Peltier device;   a first diode placed the first low pass filter in parallel in a forward bias direction between from the pulse width modulator to Peltier device; and   a second diode placed the second low pass filter in parallel in a forward bias direction from the Peltier device to the pulse width modulator.   
   
   
       2 . The temperature control device of  claim 1 , wherein the pulse width modulator apples the current to the Peltier device via the first diode and the second diode when the Peltier device is cooling state. 
   
   
       3 . The temperature control device of  claim 1 , wherein the pulse width modulator modulates the current to be smaller period than a thermal time constant of the object substance. 
   
   
       4 . A temperature control device for controlling temperature of an object substance, the temperature control device comprising:
 a pulse width modulator for changeably providing current directions of a providing current;   a low pass filter;   a Peltier device electrically connected to the pulse width modulator via the low pass filter; and   a diode placed the low pass filter in parallel.   
   
   
       5 . A temperature control method for using a Peltier device, the temperature control method comprising:
 applying a pulse width modulated current to the Peltier device to heat the Peltier device; and   applying a direct current to the Peltier device so as to cool the Peltier device.