WO2003038977A2 - Gleichspannungsversorgungsschaltung für an zumindest einer leitung angeschlossene verbraucher - Google Patents
Gleichspannungsversorgungsschaltung für an zumindest einer leitung angeschlossene verbraucher Download PDFInfo
- Publication number
- WO2003038977A2 WO2003038977A2 PCT/DE2002/004021 DE0204021W WO03038977A2 WO 2003038977 A2 WO2003038977 A2 WO 2003038977A2 DE 0204021 W DE0204021 W DE 0204021W WO 03038977 A2 WO03038977 A2 WO 03038977A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- line
- switching means
- voltage
- control input
- current
- Prior art date
Links
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
Definitions
- the invention relates to a DC voltage supply circuit for consumers connected to at least one line according to the preamble of claim 1.
- the switching means also called series switches, interposed for the purpose of overvoltage protection between the supply voltage source and the line or lines to the consumers, are usually controlled by a Zener diode which, when a predetermined maximum value of the voltage on the line exceeds the control input with the Line connects and the switching means is opened.
- Self-conducting field effect transistors are used in particular for this.
- a suitable DC voltage supply circuit is to be presented, which is also particularly suitable for use in a central unit of a bus system in which current and / or voltage signals are transmitted on the line (s) to the connected consumers and modulated onto the DC voltage.
- a voltage expensive used which is connected in series with a first current source in the direction of the supply voltage source and a second current source in the direction of the reference potential, so that the current flow through the voltage divider and thus the voltage at the control input is largely constant compared to the possibly fluctuating voltage level on the line ,
- the current source directed towards the reference potential ensures that when the predetermined maximum value of the voltage on the line and breakdown of the Z diode is exceeded, the control input is connected to the line and the switching means is opened, but on the other hand the current flow remains low. In the event of an overvoltage, the current source significantly limits the current flow and thus carries a significant part of the voltage drop.
- Known circuit arrangements, such as current mirrors, can be used as current sources.
- another switching means is preferably also switched in the line carrying the reference potential in synchronism with the switching means between the supply voltage source and the line to the consumers.
- the supply circuit can also be designed in a simple manner for changing the line carrying the supply voltage.
- FIG. 1 shows a DC voltage supply circuit as can be used, for example, in a central unit of a bus system, in which one or more consumers 5 are connected to the line (s) L out ⁇ , L out2 of the bus system. These can be connected to the lines in parallel or in series, as a daisy chain or with their own reference potential connection without a return line. Current and / or voltage signals ⁇ U, ⁇ l are modulated onto the DC voltage.
- the DC voltage supply circuit is thus connected to consumer 5 via at least one line Loutl and has a switching means 1 between a supply voltage source Uq and the line L ou t ⁇ , the switching means 1 being controllable via a control input 11.
- the switching means 1 is preferably a self-conducting one
- Field effect transistor is provided, the control input 11 corresponding to the gate of the field effect transistor 1.
- a Zener diode 4 is connected between the line L out ⁇ and the control input 11, which breaks down when a predetermined maximum value of the voltage U zmax on the line L out ⁇ is exceeded and thus connects the control input 11 to the line.
- the switching means 1 is thus opened via the control input 11, that is to say controlled in the blocking state.
- a voltage divider R1 / R2 is provided between the internal supply voltage source Uq and the reference potential (ground JL), which has a center tap 81, which is connected to the control input 1 of the switching means 1.
- the voltage divider is made up of two resistors Rl, R2 formed, but can in principle also be formed by other components with a defined voltage drop, for example by diodes.
- a first current source Iql is connected from the center tap 81 to the supply voltage source Uq and a second current source Iq2 is connected in series from the center tap 81 to the reference potential J_.
- the second current source Iq2 can also be regarded as a current sink due to its connection to reference potential -L.
- Known current mirror circuits are preferred in particular as a circuit design because of their constant current properties and dielectric strength over the expected interference voltages.
- the current sources Iql and Iq2 each preferably have a predetermined current value, which is determined such that when the Z diode 4 is blocked, a voltage drop below a limit value, preferably a negligible voltage drop, occurs across the current sources Iql, Iq2, ie the current value of these current sources Iql and Iq2 approximately corresponds to Uq-U D i 0 ae / (R2 + R1).
- a voltage of approximately Iq2 * R2 is present at the control input 11. This voltage at the control input 11 is isolated from the supply voltage Uq thanks to the first current source Iql, so that fluctuations, for example due to the data transmission by means of superimposed current and / or voltage pulses, do not cause interference.
- Such a DC voltage supply circuit is used, for example, in the central unit of a bus system for energy and data transmission in vehicles, in particular in vehicles with two different supply voltages.
- the control input 11 is connected to the line L out ⁇ and the switching means 1 is opened.
- the current source Iq2 due to the now strongly current-limiting effect of the current source Iq2, only the corresponding current value continues to flow through the resistor R2, so that a large part of the overvoltage is absorbed by the current source circuit Iq2.
- a diode D is also installed as additional protection, which blocks in the event of overvoltage and protects the current source Iql.
- a second switching means 6 is preferably provided between this second line Lout2 and the reference potential _L, which is controlled as a function of the signal at the control input 11 of the first switching means 1.
- This switching means 6 is also preferably a self-conducting field effect transistor, the control inputs being able to be coupled directly or via a converter circuit 61 if this is necessary for the synchronous actuation on account of the other voltage conditions.
- the supply circuit for a change of the line L ou t ⁇ or L out2 carrying the supply voltage can be designed symmetrically by providing two assigned internal line sections Linl, Lin2 in FIG. 2, one line Loutl / Lout2 each via a switching means 1 , 6 can be connected to the assigned internal line section Linl, Lin2.
- Each line Loutl, Lout2 each has a Z-diode 4.1, 4.2 connected to the control input 11 of the switching means 1.6.
- the internal line sections Linl, Lin2 is an H-bridge with four diodes Dll, D12, D21, D22 and one Central branch 8 is provided.
- One of the internal line sections Linl, Lin2 can optionally be connected to the supply voltage source Uq and the other to the reference potential J_, the diodes D11, D12, D21, D22 of the H-bridge being polarized so that the current flow direction in the central branch 8 remains the same regardless of the selection of the internal line section Linl, Lin2 connected to the supply voltage source Uq.
- the voltage divider R1 / R2 with the center tap 81 is again arranged, to which (81) the control inputs 11 and 61 of the switching means 1.6 are connected in this example via a control circuit 7.
- the current sources Iql, Iq2 are again arranged on both sides of the center tap 81.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Direct Current Feeding And Distribution (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02779181A EP1438781B1 (de) | 2001-10-27 | 2002-10-25 | Gleichspannungsversorgungsschaltung für an zumindest einer leitung angeschlossene verbraucher |
DE50211297T DE50211297D1 (de) | 2001-10-27 | 2002-10-25 | Gleichspannungsversorgungsschaltung für an zumindest einer leitung angeschlossene verbraucher |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10153158.3 | 2001-10-27 | ||
DE2001153158 DE10153158A1 (de) | 2001-10-27 | 2001-10-27 | Gleichspannungsversorgungsschaltung für an zumindest einer Leitung angeschlossene Verbraucher |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003038977A2 true WO2003038977A2 (de) | 2003-05-08 |
WO2003038977A3 WO2003038977A3 (de) | 2003-10-16 |
Family
ID=7703979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/004021 WO2003038977A2 (de) | 2001-10-27 | 2002-10-25 | Gleichspannungsversorgungsschaltung für an zumindest einer leitung angeschlossene verbraucher |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1438781B1 (de) |
DE (2) | DE10153158A1 (de) |
WO (1) | WO2003038977A2 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3526177A1 (de) * | 1985-07-23 | 1987-02-05 | Bosch Gmbh Robert | Rberspannungs-schutzschaltung |
US6031705A (en) * | 1997-07-05 | 2000-02-29 | Robert Bosch Gmbh | Surge protection circuit, in particular for inputs of integrated circuits |
DE19853100A1 (de) * | 1998-11-18 | 2000-05-31 | Bosch Gmbh Robert | Stromversorgungsschaltung |
-
2001
- 2001-10-27 DE DE2001153158 patent/DE10153158A1/de not_active Withdrawn
-
2002
- 2002-10-25 DE DE50211297T patent/DE50211297D1/de not_active Expired - Lifetime
- 2002-10-25 WO PCT/DE2002/004021 patent/WO2003038977A2/de active IP Right Grant
- 2002-10-25 EP EP02779181A patent/EP1438781B1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3526177A1 (de) * | 1985-07-23 | 1987-02-05 | Bosch Gmbh Robert | Rberspannungs-schutzschaltung |
US6031705A (en) * | 1997-07-05 | 2000-02-29 | Robert Bosch Gmbh | Surge protection circuit, in particular for inputs of integrated circuits |
DE19853100A1 (de) * | 1998-11-18 | 2000-05-31 | Bosch Gmbh Robert | Stromversorgungsschaltung |
Non-Patent Citations (2)
Title |
---|
"LOW-LOSS ELECTRONIC CIRCUIT BREAKER" RESEARCH DISCLOSURE, KENNETH MASON PUBLICATIONS, HAMPSHIRE, GB, Nr. 368, 1. Dezember 1994 (1994-12-01), Seite 686 XP000497333 ISSN: 0374-4353 * |
LACANETTE K: "CIRCUIT DETECTS AND DISCONNECTS OVERVOLTAGES" EDN ELECTRICAL DESIGN NEWS, CAHNERS PUBLISHING CO. NEWTON, MASSACHUSETTS, US, Bd. 41, Nr. 9, 25. April 1996 (1996-04-25), Seite 124,126 XP000592140 ISSN: 0012-7515 * |
Also Published As
Publication number | Publication date |
---|---|
DE50211297D1 (de) | 2008-01-10 |
EP1438781B1 (de) | 2007-11-28 |
DE10153158A1 (de) | 2003-05-15 |
WO2003038977A3 (de) | 2003-10-16 |
EP1438781A2 (de) | 2004-07-21 |
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