Patent US4137756A successfully refreshed from Google Patents.
Patent US5515682A successfully refreshed from Google Patents.
US5515682A
Expired / Lapsed
US
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Peltier control circuit and a peltier device structure
Assignee: Fujitsu Ltd
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Filing: 1994-11-17
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Granted: 1996-05-14
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Expires: 2014-11-17
Abstract
Abstract A Peltier control circuit detects a temperature of a device combined with a Peltier device and controls a current flowing through the Peltier device so as to keep the temperature of the device at a predetermined value. The circuit has a temperature sensing section for detecting the temperature of a device, a comparing section for comparing a temperature detection value with a predetermined temperature reference value, a limiting section for providing a comparison output with the limitation of a current flowing through the Peltier device and providing the limitation with a predetermined temperature characteristics, and a driving section for providing the Peltier device with an input or output driving current in accordance with the comparison output via the limiting section.
Inventors
- 👤 Yasunori Nagakubo
- 👤 Takashi Tsuda
- 👤 Tetsuo Ishizaka
- 👤 Shunichi Sato
- 👤 Saeko Yokoi
- 👤 Manabu Komiyama
- 👤 Toshio Ohya
- 👤 Noriaki Mizuguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:46
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/024; H01S5/02407; H01S5/02415; F; F25; F25B; F25B21/00; F25B21/02; F25B21/04; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; H10; H10N; H10N10/00; H10N10/10; F25B2321/00; F25B2321/02; F25B2321/021; F25B2321/0212
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
139 words
A Peltier control circuit that detects a temperature of a device combined with a Peltier device and controls a current flowing through the Peltier device in accordance with the temperature detected so as to keep the temperature of the device at a predetermined value, the circuit comprising: a temperature sensing section for detecting said temperature of a device; a comparing section for comparing a temperature detection value detected by said temperature sensing section with a predetermined temperature reference value; a limiting section for providing a comparison output from said comparing section with the limitation of a current flowing through the Peltier device and providing said limitation of the current with predetermined temperature characteristics; and a driving section for providing the Peltier device with an input or output driving current in accordance with said comparison output via said limiting section.
Claim 2
Dependent Claim
139 words
A Peltier control circuit that detects a temperature of a device combined with a Peltier device and controls a current flowing through the Peltier device in accordance with the temperature detected so as to keep the temperature of the device at a predetermined value, the circuit comprising: a temperature sensing section for detecting said temperature of a device; a comparing section for comparing a temperature detection value detected by said temperature sensing section with a predetermined temperature reference value; a limiting section for providing a comparison output from said comparing section with the limitation of a current flowing through the Peltier device and providing said limitation of the current with predetermined temperature characteristics; and a driving section for providing the Peltier device with an input or output driving current in accordance with said comparison output via said limiting section.
Claim 3
Dependent Claim
53 words
A Peltier control circuit as set forth in claim 1, wherein said limiting section limits said input or output driving current in accordance with the variation of an ambient temperature so as to compress a region of a temperature dead zone in which said input driving current alternates with said output driving current.
Claim 4
Dependent Claim
33 words
A Peltier control circuit as set forth in claim 2, wherein said comparing section includes a comparator for comparing a temperature detection voltage from said temperature sensing section with a predetermined reference voltage.
Claim 5
Dependent Claim
40 words
A Peltier control circuit as set forth in claim 3, wherein said limiting section limits said output driving current by providing the comparison output from said comparing section to said driving section via a resistor having a positive temperature coefficient.
Claim 6
Dependent Claim
40 words
A Peltier control circuit as set forth in claim 3, wherein said limiting section limits said input driving current by providing the comparison output from said comparing section to said driving section via a resistor having a negative temperature coefficient.
Claim 7
Dependent Claim
67 words
A Peltier control circuit as set forth in claim 3, wherein said limiting section limits said output driving current by providing the comparison output from said comparing section to said driving section via a resistor having a positive temperature coefficient, and limits said input driving current by providing the comparison output from said comparing section to said driving section via a resistor having a negative temperature coefficient.
Claim 8
Dependent Claim
30 words
A Peltier control circuit as set forth in claim 4 or 6, wherein said resistor having a positive temperature coefficient includes the serial connection of a resistor to a posistor.
Claim 9
Dependent Claim
30 words
A Peltier control circuit as set forth in claim 5 or 6, wherein said resistor having a negative temperature coefficient includes the serial connection of a resistor to a thermistor.
Claim 10
Dependent Claim
47 words
A Peltier control circuit as set forth in claim 6, wherein said reference voltage corresponds to a cross point value at which said output driving current via said resistor having a positive temperature coefficient intersects said input driving current via said resistor having a negative temperature coefficient.
Claim 11
Dependent Claim
76 words
A Peltier control circuit as set forth in claim 1, wherein said comparing section includes a first comparator for comparing a temperature detection voltage from said temperature sensing section with a first reference voltage corresponding to a starting point for driving said output driving current and a second comparator for comparing a temperature detection voltage from said temperature sensing section with a second reference voltage corresponding to a starting point for driving said input driving current.
Claim 12
Dependent Claim
48 words
A Peltier control circuit as set forth in claim 10, wherein the difference between said first reference voltage and said second reference voltage is used to compress or expand a region of a temperature dead zone in which said input driving current alternates with said output driving current.
Claim 13
Dependent Claim
40 words
A Peltier control circuit as set forth in claim 11, wherein said limiting section limits said output driving current by providing a comparison output from said first comparator to said driving section via a resistor having a positive temperature coefficient.
Claim 14
Dependent Claim
40 words
A Peltier control circuit as set forth in claim 11, wherein said limiting section limits said input driving current by providing a comparison output from said second comparator to said driving section via a resistor having a negative temperature coefficient.
Claim 15
Dependent Claim
67 words
A Peltier control circuit as set forth in claim 11, wherein said limiting section limits said output driving current by providing a comparison output from said first comparator to said driving section via a resistor having a positive temperature coefficient, and limits said input driving current by providing a comparison output from said second comparator to said driving section via a resistor having a negative temperature coefficient.
Claim 16
Dependent Claim
30 words
A Peltier control circuit as set forth in claim 12 or 14, wherein said resistor having a positive temperature coefficient includes the serial connection of a resistor to a posistor.
Claim 17
Dependent Claim
30 words
A Peltier control circuit as set forth in claim 13 or 14, wherein said resistor having a negative temperature coefficient includes the serial connection of a resistor to a thermistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-14 | 1999-11-13 | 2000-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-14 | 2003-11-13 | 2004-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-14 | 2007-11-13 | 2008-05-14 | $7700.00 | Window Closed / Lapsed |