DE102006033970A1 - Temperature protection circuit for e.g. power transistor, has schottky diode connected using electronic circuit, which controls power transistor based on current, which flows in reverse direction through schottky diode - Google Patents
Temperature protection circuit for e.g. power transistor, has schottky diode connected using electronic circuit, which controls power transistor based on current, which flows in reverse direction through schottky diode Download PDFInfo
- Publication number
- DE102006033970A1 DE102006033970A1 DE200610033970 DE102006033970A DE102006033970A1 DE 102006033970 A1 DE102006033970 A1 DE 102006033970A1 DE 200610033970 DE200610033970 DE 200610033970 DE 102006033970 A DE102006033970 A DE 102006033970A DE 102006033970 A1 DE102006033970 A1 DE 102006033970A1
- Authority
- DE
- Germany
- Prior art keywords
- schottky diode
- transistor
- power transistor
- temperature
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature
Abstract
Description
Die Erfindung betrifft eine Temperaturschutzschaltung zum Schutz eines elektronischen Bauelements, beispielsweise eines elektronischen Schalters in einem Ladegerät, vor Übertemperatur.The The invention relates to a temperature protection circuit for protecting a electronic component, such as an electronic Switch in a charger, before overtemperature.
Aus
Patent Abstracts of Japan (
Es ist Aufgabe der vorliegenden Erfindung eine Temperaturschutzschaltung zum Schutz eines elektronischen Bauelements vor Übertemperatur anzugeben, die den genannten Nachteil des Standes der Technik vermeidet.It The object of the present invention is a temperature protection circuit to provide protection of an electronic device from overheating, the avoids the mentioned disadvantage of the prior art.
Erfindungsgemäß ist diese Aufgabe durch eine Temperaturschutzschaltung gelöst, bei der eine Schottky-Diode thermisch gut mit dem vor Übertemperatur zu schützenden elektronischen Bauelement gekoppelt ist. Die Schottky-Diode ist in Sperr-Richtung geschaltet und mit einer elektronischen Schaltung verbunden, die in Abhängigkeit von dem in Sperr-Richtung durch die Schottky-Diode fließenden Strom das elektronische Bauelement ansteuert, und somit bei hoher Temperatur eine Verringerung der Verlustleistung im elektronischen Bauelement bewirkt. Auf diese Weise kann die Temperatur des elektronischen Bauelelements begrenzt und/oder geregelt werden, d.h. das Überschreiten einer Maximaltemperatur für das elektronische Bauelelement bzw. die Schottky-Diode und somit deren Zerstörung vermieden werden.According to the invention this is Problem solved by a temperature protection circuit, wherein a Schottky diode thermally good with the over temperature to be protected electronic component is coupled. The Schottky diode is switched in blocking direction and with an electronic circuit connected, depending on from the reverse current flowing through the Schottky diode current the electronic component controls, and thus at high temperature a reduction in power dissipation in the electronic component causes. In this way, the temperature of the electronic Component be limited and / or regulated, i. the crossing a maximum temperature for the electronic component or the Schottky diode and thus their destruction be avoided.
Die erfindungsgemäße Temperaturschutzschaltung nutzt die Eigenschaft einer Schottky-Diode, daß der in Sperr-Richtung durch die Schottky-Diode fließende Strom exponentiell von der Temperatur abhängt, d.h. der bei einer höheren Temperatur fließende Sperrstrom ist sehr viel größer als der bei einer niedrigeren Temperatur fließende Sperrstrom. Um diese Eigenschaft zum Regeln oder Begrenzen der Temperatur eines elektronischen Bauelements ausnutzen zu können, kommt es zwar auf die an der Schottky-Diode anliegende Sperrspan nung nicht wesentlich an, jedoch sollte diese Sperrspannung im gesamten Temperaturbereich in derselben Größenordnung liegen und auch hoch genug sein, damit die temperaturabhängige Änderung des Sperrstroms zum Zwecke der Regelung oder Begrenzung genügend groß ist.The inventive temperature protection circuit Uses the property of a Schottky diode that the reverse direction through the Schottky diode flowing Current depends exponentially on the temperature, i. at a higher temperature flowing Reverse current is much greater than the reverse current flowing at a lower temperature. Around Property for regulating or limiting the temperature of an electronic To exploit the device, Although it comes to the voltage applied to the Schottky diode clamping voltage not essential, however, this reverse voltage should be throughout Temperature range are the same size and also be high enough so that the temperature-dependent change of the reverse current to Purposes of regulation or limitation is sufficiently large.
Die erfindungsgemäße Temperaturschutzschaltung ist vorzugsweise für Elektrokleingeräte vorgesehen, beispielsweise elektrische Zahnbürsten oder elektrische Rasierapparate, die einen Akkumulator enthalten, dessen Ladestrom durch einen vor Übertemperatur zu schützenden Leistungstransistor fließt. Die erfindungsgemäße Temperaturschutzschaltung kann aber natürlich auch für andere Schaltungen verwendet werden, in denen ein elektronisches Bauelement vor Übertemperatur geschützt werden muß.The inventive temperature protection circuit is preferably for Small electrical appliances provided, for example, electric toothbrushes or electric shavers containing an accumulator, the Charging current through one before overtemperature to be protected Power transistor flows. The temperature protection circuit according to the invention but of course also for other circuits are used in which an electronic Component before overtemperature to be protected got to.
Die Erfindung wird nachstehend anhand zweier Ausführungsbeispiele für erfindungsgemäße Temperaturschutzschaltungen erläutert, die in den beiden Zeichnungen dargestellt sind. Weitere Ausgestaltungen sind in der Beschreibung beschrieben. Es zeigtThe Invention will be described below with reference to two embodiments of temperature protection circuits according to the invention explains which are shown in the two drawings. Further embodiments are described in the description. It shows
Die
in
Bei einer anderen Ausführung der Schaltungsanordnung ist statt eines bipolaren Leistungstransistors ein MOS-FET oder dgl. vorgesehen.at another version the circuit arrangement is instead of a bipolar power transistor a MOS-FET or the like. Provided.
Die
Funktionsweise der in
Die
in
Bei einer anderen Ausführung der Schaltungsanordnung ist statt eines bipolaren Leistungstransistors ein MOS-FET oder dgl. vorgesehen.at another version the circuit arrangement is instead of a bipolar power transistor a MOS-FET or the like. Provided.
Die
Funktionsweise der in
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610033970 DE102006033970A1 (en) | 2006-07-22 | 2006-07-22 | Temperature protection circuit for e.g. power transistor, has schottky diode connected using electronic circuit, which controls power transistor based on current, which flows in reverse direction through schottky diode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610033970 DE102006033970A1 (en) | 2006-07-22 | 2006-07-22 | Temperature protection circuit for e.g. power transistor, has schottky diode connected using electronic circuit, which controls power transistor based on current, which flows in reverse direction through schottky diode |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006033970A1 true DE102006033970A1 (en) | 2008-01-24 |
Family
ID=38830750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610033970 Withdrawn DE102006033970A1 (en) | 2006-07-22 | 2006-07-22 | Temperature protection circuit for e.g. power transistor, has schottky diode connected using electronic circuit, which controls power transistor based on current, which flows in reverse direction through schottky diode |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102006033970A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2204445A (en) * | 1987-03-06 | 1988-11-09 | Texas Instruments Ltd | Semiconductor switch |
JPH1141792A (en) * | 1997-07-17 | 1999-02-12 | Furukawa Battery Co Ltd:The | Temperature protective circuit |
US6392387B1 (en) * | 2000-03-14 | 2002-05-21 | Sage Electronics And Technology, Inc. | Passively protected battery pack with on load charge and on load conditioning-discharge capability and charging system |
-
2006
- 2006-07-22 DE DE200610033970 patent/DE102006033970A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2204445A (en) * | 1987-03-06 | 1988-11-09 | Texas Instruments Ltd | Semiconductor switch |
JPH1141792A (en) * | 1997-07-17 | 1999-02-12 | Furukawa Battery Co Ltd:The | Temperature protective circuit |
US6392387B1 (en) * | 2000-03-14 | 2002-05-21 | Sage Electronics And Technology, Inc. | Passively protected battery pack with on load charge and on load conditioning-discharge capability and charging system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8139 | Disposal/non-payment of the annual fee |