Thermoelectric generating device and thermoelectric generating method

Patent metadata

Field	Value
Publication number	US-10193046-B2
Application number	US-201515112551-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	Mar 26, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A thermoelectric generating device includes: a thermoelectric generating element configured to convert thermal energy to electric energy and to output the electric energy; a temperature measuring unit configured to measure hot side temperature of the thermoelectric generating element; and a temperature controller configured to perform control to increase an amount of current returning to the thermoelectric generating element when the hot side temperature becomes higher than predetermined temperature.

First claim

The invention claimed is:

1. A thermoelectric generating device comprising:
a thermoelectric generating element configured to convert thermal energy to electric energy and to output the electric energy;
a temperature measuring unit configured to measure hot side temperature of the thermoelectric generating element;
a temperature controller configured to perform control to increase an amount of current returning to the thermoelectric generating element when the hot side temperature becomes higher than predetermined temperature; and
an opening/closing switch connected to each end of the thermoelectric generating element, wherein the opening/closing switch is configured to open/close between the ends of the thermoelectric generating element,
wherein the temperature controller controls the opening/closing switch to close the opening/closing switch when the hot side temperature becomes higher than the predetermined temperature to allow current to return to the thermoelectric generating element.

2. The thermoelectric generating device according to claim 1 , comprising:
a voltage converting circuit connected to the thermoelectric generating element that performs DC voltage conversion of the electric energy output from the thermoelectric generating element by using a switching element, wherein
the temperature controller performs control to increase the amount of the current returning to the thermoelectric generating element when the hot side temperature becomes higher than the predetermined temperature by increasing a duty ratio of the switching element.

3. The thermoelectric generating device according to claim 1 , wherein the temperature controller further performs the control to increase the amount of the current returning to the thermoelectric generating element from startup of the device until the startup of the device is completed.

4. The thermoelectric generating device according to claim 1 , wherein the temperature measuring unit measures current output from the thermoelectric generating element and measures the hot side temperature based on relationship between the current and the hot side temperature.

5. The thermoelectric generating device according to claim 1 , wherein the temperature measuring unit measures voltage between terminals of the thermoelectric generating elements and measures the hot side temperature based on relationship between the voltage and the hot side temperature.

6. The thermoelectric generating device according to claim 1 , wherein the temperature measuring unit, the opening/closing switch, and the temperature controller form a reed switch which closes between terminals of the thermoelectric generating element when current output from the thermoelectric generating element becomes larger than a predetermined value corresponding to the hot side temperature.

7. The thermoelectric generating device according to claim 1 , wherein a bypass diode having diode characteristics allowing only a flow to a current output side of each thermoelectric generating element is connected in parallel to each of a plurality of thermoelectric generating elements.

8. A thermoelectric generating method of converting thermal energy to electric energy by using a thermoelectric generating element and outputting the electric energy, comprising:
measuring hot side temperature of the thermoelectric generating element; and
increasing an amount of current returning to the thermoelectric generating element when the hot side temperature becomes higher than predetermined temperature by controlling an opening/closing switch connected to each end of the thermoelectric generating element to close the opening/closing switch when the hot side temperature becomes higher than the predetermined temperature to allow current to return to the thermoelectric generating element.

9. A thermoelectric generating device comprising:
a thermoelectric generating element configured to convert thermal energy to electric energy and to output the electric energy;
a temperature measuring unit configured to measure hot side temperature of the thermoelectric generating element; and
a temperature controller configured to perform control to increase an amount of current returning to the thermoelectric generating element when the hot side temperature becomes higher than predetermined temperature,
wherein the temperature controller further performs the control to increase the amount of the current returning to the thermoelectric generating element from startup of the device until the startup of the device is completed.

Assignees

• Kelk Ltd

Inventors

• KAIBE Hiromasa
• Hachiuma Hirokuni

Classifications

• H02M7/537

  using semiconductor devices only, e.g. single switched pulse inverters · CPC title

• H02M7/48 Primary

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02M3/155

  using semiconductor devices only · CPC title

• G01K7/02

  using thermoelectric elements, e.g. thermocouples · CPC title

• H01L35/10 Primary

  Electricity · mapped topic