DE19930036A1 - Voltage limiter circuit has control element that forms closed switch for output below defined threshold and operates as linear regulator from output voltage threshold - Google Patents
Voltage limiter circuit has control element that forms closed switch for output below defined threshold and operates as linear regulator from output voltage thresholdInfo
- Publication number
- DE19930036A1 DE19930036A1 DE1999130036 DE19930036A DE19930036A1 DE 19930036 A1 DE19930036 A1 DE 19930036A1 DE 1999130036 DE1999130036 DE 1999130036 DE 19930036 A DE19930036 A DE 19930036A DE 19930036 A1 DE19930036 A1 DE 19930036A1
- Authority
- DE
- Germany
- Prior art keywords
- voltage
- output voltage
- output
- threshold
- control element
- 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- Withdrawn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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
Die Erfindung betrifft eine Spannungsbegrenzungsschaltung mit einem in den Pfad zwischen Eingangsspannung und Ausgangsspannung geschalteten Stellglied.The invention relates to a voltage limiting circuit with one in the path Actuator connected between input voltage and output voltage.
Bei einer Spannungsregelung reduziert eine Elektronik eine große Eingangsspannung Uin auf eine kleine Ausgangsspannung Uout. Dies ist schematisch in der Fig. 2 dargestellt. Dabei ist es unerheblich, ob der Regler im Plus- oder Minuszweig angeordnet ist (siehe Fig. 2a und 2b). Als Regler wurde bisher standardmäßig ein integrierter Spannungsreglerbaustein oder ein Bipolartransistor (siehe Fig. 3) verwendet.With voltage regulation, electronics reduce a large input voltage Uin to a small output voltage Uout. This is shown schematically in FIG. 2. It is irrelevant whether the controller is arranged in the plus or minus branch (see FIGS . 2a and 2b). An integrated voltage regulator module or a bipolar transistor (see FIG. 3) has previously been used as a regulator.
Bei diesen Schaltungen entsteht immer ein Spannungsabfall über dem Regler (Uregler), und zwar selbst dann, wenn die Eingangsspannung Uin noch kleiner ist als die gewünschte Ausgangsspannung Uout. Dieses ist besonders nachteilig, wenn auch schon bei Eingangsspannungen unterhalb der maximal zulässigen Ausgangsspannung ein großer Strom I fließt, der dann am Regler hohe Verlustleistungen (Pregler = I . Uregler) erzeugt.With these circuits there is always a voltage drop across the controller (U regulator), even if the input voltage Uin is even lower than the desired output voltage Uout. This is particularly disadvantageous if even with input voltages below the maximum permissible Output voltage a large current I flows, which is then high at the controller Power dissipation (Pregler = I. Regulator) generated.
Der Erfindung liegt die Aufgabe zugrunde, eine einfache und kostengünstige Spannungsbegrenzungsschaltung zu schaffen, die zumindest bei Eingangsspannungen, die nicht größer sind als ein vorgegebener Grenzwert einer (maximal zulässigen) Ausgangsspannung eine besonders geringe Durchlaßverlustleistung aufweist.The invention has for its object a simple and inexpensive To create voltage limiting circuit that at least at Input voltages that are not greater than a predetermined limit value (maximum permissible) output voltage is a particularly low one Has transmission loss.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Stellglied unterhalb eines vorgegebenen Grenzwertes der Ausgangsspannung einen geschlossenen Schalter ausbildet und ab dem vorgegebenen Grenzwert der Ausgangsspannung als Linearregler arbeitet.This object is achieved in that the actuator below a predetermined limit value of the output voltage a closed Switch forms and from the predetermined limit of the output voltage as Linear controller works.
Das Stellglied ist hierbei vorteilhafterweise als Feldeffekttransistor oder als MOSFET ausgebildet. Solange keine Spannungsbegrenzung erfolgt, entstehen am Transistor nur geringe Durchlaßverluste (Pv = RDS-on * I2).The actuator is advantageously designed as a field effect transistor or as a MOSFET. As long as there is no voltage limitation, only small forward losses occur at the transistor (Pv = R DS-on * I 2 ).
Im folgenden soll ein Ausführungsbeispiel der erfindungsgemäßen Schaltung anhand der Zeichnung näher erläutert werden. In the following an embodiment of the circuit according to the invention be explained in more detail with reference to the drawing.
Es zeigen:Show it:
Fig. 1 ein schematisches Ausführungsbeispiel der erfindungsgemäßen Spannungsbegrenzungsschaltung, Fig. 1 is a schematic embodiment of the voltage limiting circuit according to the invention,
Fig. 2 und 3 jeweils schematisch Spannungsbegrenzungsschaltungen nach dem Stand der Technik. Fig. 2 and 3 each schematically voltage limiting circuits according to the prior art.
Ein Ausführungsbeispiel der erfindungsgemäßen Spannungsbegrenzungsschaltung ist in der Fig. 1 schematisch dargestellt.An embodiment of the voltage limiting circuit according to the invention is shown schematically in FIG. 1.
Die zu begrenzende Ausgangsspannung Uout wird durch einen Ist-/Sollwertvergleicher überwacht. Als Stellglied dient ein MOSFET, der wenn er durchgeschaltet ist, einen Innenwiderstand von nur wenigen Milliohm aufweist und dadurch einen deutlich geringeren Spannungsabfall als ein Bipolartransistor erzeugt. Bei einem Längsregler mit einem Bipolartransistor ist die zu regelnde Ausgangsspannung Uout immer um mindestens Ube = 0,6 . . . 0,7 V kleiner als die ungeregelte Eingangsspannung. Dadurch entstehen auch bei Unter- und Normalspannungsbetrieb am Bipolartransistor, je nach Last, Verluste in der Größenordnung von einigen Watt (Pv = Ube . ILast).The output voltage Uout to be limited is monitored by an actual / setpoint comparator. The actuator used is a MOSFET which, when switched through, has an internal resistance of only a few milliohms and thus generates a significantly lower voltage drop than a bipolar transistor. In the case of a series regulator with a bipolar transistor, the output voltage Uout to be regulated is always at least Ube = 0.6. , , 0.7 V less than the unregulated input voltage. This results in losses of the order of a few watts (Pv = Ube. I load ), depending on the load, even when operating under- and normal voltage at the bipolar transistor.
Bei der erfindungsgemäßen Schaltung wird das Stellglied unterhalb der maximal zulässigen Spannungsgrenze wie ein geschlossener Schalter betrieben, d. h. es ergibt sich nur ein minimaler Spannungsabfall über den Transistor. Solange keine Spannungsbegrenzung vorgenommen wird, entstehen daher am Transistor nur geringe Durchlaßverluste. Bei einem typischen Durchlaßwiderstand von 20 mOhm liegen diese im Milliwattbereich.In the circuit according to the invention, the actuator is below the maximum permissible voltage limit operated as a closed switch, d. H. it there is only a minimal voltage drop across the transistor. As long as none Voltage limitation is made only on the transistor low transmission losses. With a typical forward resistance of 20 mOhm these are in the milliwatt range.
Die Regelung des Stellgliedes erfolgt durch den Ist-/Sollwert-Vergleicher über ein Koppelglied, welcher als Optokoppler ausgebildet ist. Eine galvanische Trennung durch den Optokoppler wurde gewählt, um Störungen bzw. Rückwirkungen des Leistungsteils auf den Steuerteil auszuschließen.The actuator is controlled by the actual / setpoint comparator via a Coupling element, which is designed as an optocoupler. A galvanic isolation was chosen by the optocoupler to avoid interference or repercussions of Exclude power section on the control section.
Wird der zulässige Ausgangsspannungswert erreicht, wird das Stellglied aus dem Schalterbetrieb in den linearen Betrieb geregelt und arbeitet dann als Linearregler.If the permissible output voltage value is reached, the actuator is removed from the Switch operation regulated in linear operation and then works as a linear controller.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999130036 DE19930036A1 (en) | 1999-06-30 | 1999-06-30 | Voltage limiter circuit has control element that forms closed switch for output below defined threshold and operates as linear regulator from output voltage threshold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999130036 DE19930036A1 (en) | 1999-06-30 | 1999-06-30 | Voltage limiter circuit has control element that forms closed switch for output below defined threshold and operates as linear regulator from output voltage threshold |
Publications (1)
Publication Number | Publication Date |
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DE19930036A1 true DE19930036A1 (en) | 2001-01-04 |
Family
ID=7913100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1999130036 Withdrawn DE19930036A1 (en) | 1999-06-30 | 1999-06-30 | Voltage limiter circuit has control element that forms closed switch for output below defined threshold and operates as linear regulator from output voltage threshold |
Country Status (1)
Country | Link |
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DE (1) | DE19930036A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10105138A1 (en) * | 2001-02-01 | 2002-08-08 | E G O Control Systems Gmbh & C | Electrical circuit arrangement |
DE10158244A1 (en) * | 2001-11-28 | 2003-06-26 | Infineon Technologies Ag | Method for supplying circuit units with excess voltage on high-voltage (HV) circuits sets up an HV circuit for excess voltage, a low-voltage (LV) for LV circuit functions and a protection voltage |
DE10227335A1 (en) * | 2002-06-19 | 2004-01-15 | Infineon Technologies Ag | voltage regulators |
DE102005028211A1 (en) * | 2005-06-17 | 2006-12-28 | Infineon Technologies Ag | Switching arrangement for connecting switching nodes, has control circuit designed for n-channel MOSFET and detects one of voltages at switching nodes, where MOSFET is regulated by control input when one of voltages attains threshold value |
DE102006034780A1 (en) * | 2006-04-14 | 2007-10-18 | Mitsubishi Electric Corp. | Power supply protection circuit for an electronic device inside a vehicle |
WO2019217609A1 (en) * | 2018-05-10 | 2019-11-14 | Texas Instruments Incorporated | Constant resistance input pass switch with overvoltage protection |
US11502674B2 (en) | 2020-07-20 | 2022-11-15 | Texas Instruments Incorporated | Optimized low Ron flatness gate driver |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3110077A1 (en) * | 1981-03-16 | 1982-10-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Voltage regulating circuit |
-
1999
- 1999-06-30 DE DE1999130036 patent/DE19930036A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3110077A1 (en) * | 1981-03-16 | 1982-10-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Voltage regulating circuit |
Non-Patent Citations (1)
Title |
---|
KAIFLER,Erich, TIHANYI,Jenoe: Bessere Schaltungen mit neuen SIPMOS-Kleinsignaltransistoren. In: Siemens Components 26, 1988, H.5, S.195-198 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10105138A1 (en) * | 2001-02-01 | 2002-08-08 | E G O Control Systems Gmbh & C | Electrical circuit arrangement |
DE10158244A1 (en) * | 2001-11-28 | 2003-06-26 | Infineon Technologies Ag | Method for supplying circuit units with excess voltage on high-voltage (HV) circuits sets up an HV circuit for excess voltage, a low-voltage (LV) for LV circuit functions and a protection voltage |
DE10158244B4 (en) * | 2001-11-28 | 2004-02-12 | Infineon Technologies Ag | Active protection device for low-voltage circuits in low-voltage devices |
US6999292B2 (en) | 2001-11-28 | 2006-02-14 | Infineon Technologies Ag | Active protection device for low voltage circuits in items of low voltage equipment |
DE10227335A1 (en) * | 2002-06-19 | 2004-01-15 | Infineon Technologies Ag | voltage regulators |
US6919755B2 (en) | 2002-06-19 | 2005-07-19 | Infineon Technologies Ag | Voltage regulator |
DE102005028211A1 (en) * | 2005-06-17 | 2006-12-28 | Infineon Technologies Ag | Switching arrangement for connecting switching nodes, has control circuit designed for n-channel MOSFET and detects one of voltages at switching nodes, where MOSFET is regulated by control input when one of voltages attains threshold value |
DE102005028211B4 (en) * | 2005-06-17 | 2007-02-01 | Infineon Technologies Ag | Circuit arrangement for connecting a first circuit node to a second circuit node and for protecting the first circuit node from an overvoltage |
DE102006034780A1 (en) * | 2006-04-14 | 2007-10-18 | Mitsubishi Electric Corp. | Power supply protection circuit for an electronic device inside a vehicle |
WO2019217609A1 (en) * | 2018-05-10 | 2019-11-14 | Texas Instruments Incorporated | Constant resistance input pass switch with overvoltage protection |
US10848142B2 (en) | 2018-05-10 | 2020-11-24 | Texas Instruments Incorporated | Constant resistance input pass switch with overvoltage protection |
US11502674B2 (en) | 2020-07-20 | 2022-11-15 | Texas Instruments Incorporated | Optimized low Ron flatness gate driver |
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Legal Events
Date | Code | Title | Description |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: HELLA KGAA HUECK & CO., 59557 LIPPSTADT, DE |
|
8127 | New person/name/address of the applicant |
Owner name: GOODRICH HELLA AEROSPACE LIGHTING SYSTEMS GMBH, 59 |
|
8127 | New person/name/address of the applicant |
Owner name: GOODRICH LIGHTING SYSTEMS GMBH, 59557 LIPPSTADT, D |
|
8141 | Disposal/no request for examination |