EP0441805A1 - Stromregler. - Google Patents
Stromregler.Info
- Publication number
- EP0441805A1 EP0441805A1 EP19890911525 EP89911525A EP0441805A1 EP 0441805 A1 EP0441805 A1 EP 0441805A1 EP 19890911525 EP19890911525 EP 19890911525 EP 89911525 A EP89911525 A EP 89911525A EP 0441805 A1 EP0441805 A1 EP 0441805A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- output current
- value
- input variable
- controller according
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is DC as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
Definitions
- the invention relates to a current regulator according to the preamble of the main claim.
- the upper limit frequency of the feedback loop should be designed to be lower for the region lying near the output current "zero" than for the region of higher currents. Variable cut-off frequencies, however, require more circuitry.
- the current controller according to the invention with the characterizing features of the main claim has the advantage that the low currents are hidden. With conventional consumers such as motors, incandescent lamps or the like, an output current below a value of approximately 20% of the maximum current is of no interest, since they hardly respond in this area anyway. In addition, there is the advantage that a conventional offset voltage of the operational amplifier in the control loop or an external potential offset which is coupled to the input of the controller does not lead to an output current. Further advantages result from subclaims 2 to 10.
- FIGS. 1 and 2 show the transfer characteristic
- Figure 2 shows the block diagram of the current controller.
- the input variable E can be an externally supplied electrical voltage or an electrical current; however, as in the case of a monolithically integrated current regulator, it can also be generated inside the circuit itself, for example by means of a temperature for a temperature regulator with a cooling fan, or else by other variables such as mechanical stresses, a luminous flux or the like.
- the range in which the output current is zero can be defined by the output current or the input variable. Since the Output current is decisive for the dynamic instability, it is advantageous to also define this range by means of the output current.
- the output current is only switched on by an input variable that increases from zero after it gives a current value of approximately 4 A at 11; Accordingly, if the input variable falls, the output current is only switched off if the current value falls below 12 A at 12.
- This hysteresis is necessary in order to create defined conditions and thus prevent oscillation around the switching point.
- the rate of rise of the output current when switched on is to be adapted to the conditions, which is possible without influencing the upper limit frequency of the control loop.
- a current value of up to approximately 20% of the maximum output current with a hysteresis of approximately 50% to 80% of this value has proven to be advantageous for the switch-on point.
- the object of the invention is therefore particularly advantageous for fast current regulators with short transition times, in particular also for monolithically integrated circuits, since there the expenditure for frequency-reducing capacities requires large chip areas.
- 1 denotes the connection on the opposite side, 2 the input and 3 the output of the current regulator.
- resistors 4 and 5 form a voltage divider with connection point 16 for adapting the transfer characteristic to the required input voltage range
- 6 is the measuring resistor for the output current
- 7 is the operational amplifier in the control circuit with its output 18.
- 8 is a downstream transistor as an emitter follower for further current amplification and with 9 the power referred to transistor.
- the positive input terminal of the operational amplifier 7 is at point 16 of the resistance divider, the negative input at point 17 of the measuring resistor 6; this closes the control loop. Measures to achieve dynamic stability have not been presented.
- Section 11, 12 of the transfer characteristic is achieved by means of the comparator 10 with hysteresis, the negative input terminal of which is also connected to the input voltage (terminal 16) and the positive input terminal of which is connected to a reference voltage 14.
- a Schmitt trigger can also be used.
- the output of the comparator 10 is connected to the base of the transistor 15, the collector of which engages at the output 18 of the operational amplifier 7.
- the output 19 of the comparator is high, the transistor 15 receives base current, its collector pulls the output 18 of the operational amplifier 7 against ground potential Transistors 8, 9 receive no base current, the output current remains zero until the potential 16/1 becomes greater than that of 14; from this point on, the comparator 10 flips, its output 19 goes to ground potential, the transistor 15 is de-energized and thus enables the power amplifier to be controlled with the transistors 8, 9.
- the invention relates to a circuit for masking out a section of the transfer characteristic of a current regulator bordering on "zero" for relatively large output currents. Since these regulators tend to dynamic instability due to the current density-dependent transit frequency of the power transistors, especially at small currents, it is advantageous to hide the area of the small currents that are not required.
- the goal is to make the current regulator dynamically stable for any wiring harnesses occurring in a motor vehicle. can be achieved with less circuitry, which has a cost-reducing effect, particularly in the case of monolithically integrated circuits.
- any operational amplifier offset voltage and potential offset present at the input are eliminated.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Amplifiers (AREA)
Description
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3837215 | 1988-11-02 | ||
| DE3837215 | 1988-11-02 | ||
| DE3933433A DE3933433A1 (de) | 1988-11-02 | 1989-10-06 | Stromregler |
| DE3933433 | 1989-10-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0441805A1 true EP0441805A1 (de) | 1991-08-21 |
| EP0441805B1 EP0441805B1 (de) | 1993-03-10 |
Family
ID=25873819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89911525A Expired - Lifetime EP0441805B1 (de) | 1988-11-02 | 1989-10-21 | Stromregler |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5173655A (de) |
| EP (1) | EP0441805B1 (de) |
| JP (1) | JP2766016B2 (de) |
| DE (2) | DE3933433A1 (de) |
| WO (1) | WO1990005330A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4890196A (en) * | 1995-03-09 | 1996-10-02 | Nippon Shinyaku Co. Ltd. | Remedy for pancreatitis |
| US5962454A (en) * | 1995-04-20 | 1999-10-05 | Nippon Shinyaku Co., Ltd. | Neovascularization inhibitor |
| DE19726773A1 (de) * | 1997-06-24 | 1999-01-07 | Bosch Gmbh Robert | Verfahren zum Abgleichen eines Stromreglers |
| US7573212B2 (en) * | 2003-01-22 | 2009-08-11 | Avis Deborah K | Automatic power control module for battery powered devices |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1513127C3 (de) * | 1965-04-23 | 1978-06-01 | Frako Kondensatoren- Und Apparatebau Gmbh, | Schaltungsanordnung zum Einschalten eines elektronischen Gerätes oberhalb eines vorbestimmten Speisespannungswertes |
| DE2147179C3 (de) * | 1971-09-22 | 1984-11-08 | Robert Bosch Gmbh, 7000 Stuttgart | Monolithisch integrierte Stromquelle |
| US4028564A (en) * | 1971-09-22 | 1977-06-07 | Robert Bosch G.M.B.H. | Compensated monolithic integrated current source |
| JPS5279747A (en) * | 1975-12-26 | 1977-07-05 | Sony Corp | Noise removal circuit |
| DE3541308C1 (en) * | 1985-11-22 | 1987-02-05 | Philips Patentverwaltung | DC power supply generator e.g. for gas discharge lamp - obtains regulated DC from mains supply giving sinusoidal input to filter and rectifier |
| US4849683A (en) * | 1988-12-07 | 1989-07-18 | Motorola, Inc. | Lamp driver circuit with controlled power over a range of power supply voltages |
-
1989
- 1989-10-06 DE DE3933433A patent/DE3933433A1/de not_active Withdrawn
- 1989-10-21 EP EP89911525A patent/EP0441805B1/de not_active Expired - Lifetime
- 1989-10-21 US US07/679,056 patent/US5173655A/en not_active Expired - Fee Related
- 1989-10-21 JP JP1510762A patent/JP2766016B2/ja not_active Expired - Lifetime
- 1989-10-21 WO PCT/DE1989/000670 patent/WO1990005330A1/de not_active Ceased
- 1989-10-21 DE DE8989911525T patent/DE58903758D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9005330A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US5173655A (en) | 1992-12-22 |
| DE3933433A1 (de) | 1990-05-03 |
| JP2766016B2 (ja) | 1998-06-18 |
| EP0441805B1 (de) | 1993-03-10 |
| JPH04501474A (ja) | 1992-03-12 |
| DE58903758D1 (de) | 1993-04-15 |
| WO1990005330A1 (de) | 1990-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
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