EP1304908A1 - Correction d'erreurs des valeurs de référence dans circuits électroniques - Google Patents

Correction d'erreurs des valeurs de référence dans circuits électroniques Download PDF

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Publication number
EP1304908A1
EP1304908A1 EP01125076A EP01125076A EP1304908A1 EP 1304908 A1 EP1304908 A1 EP 1304908A1 EP 01125076 A EP01125076 A EP 01125076A EP 01125076 A EP01125076 A EP 01125076A EP 1304908 A1 EP1304908 A1 EP 1304908A1
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EP
European Patent Office
Prior art keywords
value
error
values
base
reference value
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
Application number
EP01125076A
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German (de)
English (en)
Other versions
EP1304908B1 (fr
Inventor
Stefan Zudrell-Koch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonicatco GmbH and Co KG
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Tridonicatco GmbH and Co KG
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Publication date
Application filed by Tridonicatco GmbH and Co KG filed Critical Tridonicatco GmbH and Co KG
Priority to AT01125076T priority Critical patent/ATE327651T1/de
Priority to DE50109891T priority patent/DE50109891D1/de
Priority to EP01125076A priority patent/EP1304908B1/fr
Publication of EP1304908A1 publication Critical patent/EP1304908A1/fr
Application granted granted Critical
Publication of EP1304908B1 publication Critical patent/EP1304908B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Definitions

  • the present invention relates to a method for correcting the error of a two basic values for an electronic circuit, the two underlyings from the same one, with an error Reference value can be derived.
  • the electronic circuit is for example, an electronic ballast for operating at least one Gas discharge lamp or fluorescent lamp or around an operating device for LEDs or Halogen lamps.
  • Electronic circuits often have several separate control loops on, with the help of certain operating parameters of the circuit to a desired Value to be regulated.
  • DC link voltage and the one flowing over the half bridge of the inverter Current can be set to the power with which the lamp will ultimately operate will keep constant or at a certain value.
  • a setpoint is generated and with the corresponding current actual value of the circuit compared, the activation of the Switching controller for the DC link voltage and the inverter depending of the deviations of the actual values from the target values.
  • the setpoint of a control loop is usually derived from a reference value, at a certain point in the electronic circuit - for example with the help a Zener diode - is generated.
  • the reference value is generated with a predetermined accuracy, the actually generated reference value compared to the ideal reference value can deviate upwards or downwards. This unavoidable errors in the reference value also affect e.g. about one Setpoint derived from the voltage divider, the value set using the control loop Operating parameters and ultimately also the lamp power.
  • the present invention is therefore based on the object in an electronic Circuit for operating lamps the increasing error of a Avoid reference deviation or at least significantly reduce it.
  • one of the two basic values is initially selected derived from the reference value regardless of its error. Then be Direction and magnitude of the error of this underlying by comparison with a Nominal value determined and the other base value derived from the reference value below Taking into account the error of the first-mentioned base value changed in such a way that the Influence of the reference value error in the formation of the combination value is compensated becomes.
  • the combination value the product of the two underlyings, the change of the or one of the Basic values in the inverse direction to the deviation of the reference value.
  • the whole Circuit can be kept very simple with this method, since only one only reference value must be generated.
  • the change in the second underlying can, for example, during a comparison before commissioning the electronic Circuit can be performed.
  • the method according to the invention can be used, in particular, with an electronic one Ballast for operating at least one gas discharge lamp - in particular a fluorescent lamp - in which the two basic values are used a setpoint for a control circuit for regulating the intermediate circuit voltage and the Form half-bridge current.
  • the combination value corresponds to the lamp power here, essentially through the product of half-bridge current and lamp voltage is formed.
  • the second base value can be modified, for example, with the help a multiple voltage divider, the base value depending on the size and Direction of the previously determined error of the first base value from a specific one Connection point of the multiple voltage divider is derived.
  • the inventive method can be used for halogen lamps.
  • FIG. 1 shows the circuit diagram of an electronic ballast which is connected on the input side to the mains supply voltage U 0 via a high-frequency filter 1.
  • a rectifier circuit 2 in the form of a full-bridge rectifier, which converts the mains supply voltage U 0 into a rectified input voltage for a smoothing circuit 3.
  • This smoothing circuit 3 is used for harmonic filtering and smoothing the rectified circuit 2 rectified mains supply voltage U 0 and for this purpose comprises a smoothing capacitor C1 and a step-up converter having an inductor L1, a controllable switch in the form of a MOS field-effect transistor S1 and a diode D1.
  • a corresponding switching of the MOS field-effect transistor S1 generates an intermediate circuit voltage U z which is present across the storage capacitor C2 connected to the smoothing circuit 3 and which is fed to an inverter 4.
  • This inverter 4 is formed by two further MOS field effect transistors S2 and S3 arranged in a half-bridge arrangement.
  • a high-frequency activation of the two field effect transistors S2, S3 generates a high-frequency AC voltage at their center tap, which is fed to the load circuit 5 with the gas discharge lamp LA connected to it.
  • the mode of operation of such a ballast is already well known and will therefore not be explained further below.
  • the control of the three MOS field-effect transistors S1-S3 of the smoothing circuit 3 and of the inverter 4 is carried out by a control circuit 6, which generates corresponding switching information and transmits it to a driver circuit 7 connected to the control circuit 6.
  • the driver circuit 7 converts the switching information into corresponding control signals and controls the gates of the three MOS field-effect transistors S1-S3 via the line 12-14. This takes into account the actual value of the intermediate circuit voltage U z and the actual value of the current flowing across the half bridge. For this purpose, the intermediate circuit voltage U z is tapped at the intermediate circuit capacitor C2 and fed to the control circuit 6 via an input line 15.
  • the current half-bridge current is measured with the aid of the voltage dropping via a shunt resistor R, which is located at the base of the half-bridge inverter 4, which voltage is likewise fed to the control circuit 6 via a further input line 16.
  • a shunt resistor R which is located at the base of the half-bridge inverter 4, which voltage is likewise fed to the control circuit 6 via a further input line 16.
  • the first control circuit is used to regulate the intermediate circuit voltage U z , which is supplied to the control circuit 6 via the input line 15.
  • the intermediate circuit voltage U z is as an actual value to a first input value for a comparator 8
  • the second input value is generated by an internal control block 10 and forms the setpoint value for the intermediate circuit voltage U z.
  • the comparison result between the target value and the actual value for the intermediate circuit voltage U Z is fed to a control circuit 11, which uses this comparison result to calculate control signals and transmits them to the driver circuit 7.
  • Part of the second control loop is another one in the control circuit 6 arranged comparator 9, the first input value of which via the shunt resistor R falling and supplied with the help of the input line 16 is voltage Provides information about the current actual value of the half-bridge current.
  • the setpoint for this current is also generated by the control block 10 and second Input signal supplied to the comparator 9, which in turn the comparison result passes the control circuit 11.
  • the control circuit 11 then generates corresponding ones Switching information that is sent to the two MOS field-effect transistors via the driver circuit 7 S2 and S3 are forwarded.
  • the half-bridge current and the intermediate circuit voltage are separately kept constant or regulated to a certain value in order to keep the power at which the lamp LA is ultimately operated at a predetermined value.
  • An error in the two setpoints for the control loops formed by the control block 10 has a direct effect on the intermediate circuit voltage U z and the half-bridge current and thus also on the lamp power. If both setpoints are derived from a common reference, there is a risk that the errors in the intermediate circuit voltage U z and the half-bridge current will multiply, so that the lamp power ultimately set is associated with a very high error. In order to avoid this, the two setpoints are derived from the common reference according to the method according to the invention, which will be explained below with reference to FIGS. 2a-c.
  • FIG. 2a first shows the ideal case in which the reference value has no errors.
  • the reference value R which corresponds exactly to its setpoint is first generated within the control block 10.
  • This reference value R can be generated, for example, with the aid of a tens diode or the like.
  • two basic values a and b are then derived, which form the target values for the two control loops.
  • the combination value c is finally formed from the two basic values a and b;
  • the basic values a and b correspond to the actual values for the intermediate circuit voltage U z or the half-bridge current
  • the derivation of the second base value b 2 is therefore influenced according to the invention, specifically as a function of the direction and size of the error ⁇ a 2 of the first base value. This takes place, for example, in that the reference value R + ⁇ R is now not multiplied by the factor ⁇ as in the ideal case to form the second base value, but instead is instead multiplied by a multiplication factor shifted by a correction value ⁇ . So now applies.
  • b 2 ( ⁇ - ⁇ ) ⁇ ( R + ⁇ R )
  • the other base value a 2 corresponds to the base value a 1 of the example in FIG. 2b.
  • the correction value ⁇ is shifted in particular in the inverse direction to the deviation ⁇ a 2 of the first basic value a.
  • the derived second base value b 2 again has a shift .DELTA.b 2 compared to the ideal value b, but now in the opposite direction to the shift of the reference value or the first base value.
  • both base values a 2 and b 2 derived from the incorrect reference value R + ⁇ R are shifted relative to their ideal or nominal values a and b, the errors, however, being so opposed to one another that the error of the combination value increases a large part or almost completely compensated.
  • the combination value formed at the end thus has a significantly lower error, although it was formed from two base values, both of which were derived from the same error-prone reference. If the error ⁇ a 2 of the first base value is thus known, then a suitable shift factor for the multiplication factor for deriving the second base value can be selected, with which the error of the combination value is completely or at least substantially reduced.
  • B c 2 ⁇ ⁇ ⁇ a 2 ⁇ R a + ⁇ a 2 the same applies to the error ⁇ c 2 of the combination value c 2 ⁇ c 2 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ R 2
  • FIG. 3 shows a circuit which can be used to influence the formation of a setpoint for one of the two control loops in the manner just described.
  • This circuit essentially consists of a multiple voltage divider 17, the output signal of which forms the setpoint for the comparator 8 of the control loop.
  • the input signal for the multiple voltage divider 17 forms the reference voltage generated by a DC voltage source 18, which, depending on the state of the various switches S 11 to S 16, is converted into a specific input voltage for the comparator.
  • the first base value is first derived from the reference value in a normal manner, that is to say changed until it is within a specified tolerance window.
  • This comparison especially if it is carried out digitally with a limited resolution, never leads to a perfect result, but merely to the fact that the first base value comes within the permissible tolerance window.
  • the error or the deviation of the derived first base value from its nominal value is then determined. Because of this deviation and in particular taking into account the sign of this deviation, one of the switches S 11 to S 16 of the multiple voltage divider 17 is then set in accordance with a defined assignment.
  • FIGS. 4a and 4b show a histogram of the error distribution for the over the two control loops for the DC link voltage and the Half-bridge current set lamp power P, Fig. 4a for the case without Error correction and Fig. 4b with previously performed error correction.
  • the accuracy of the regulation of the lamp power can thus by The inventive method can be increased significantly.
  • the present invention thus offers the possibility of correcting the error caused by the Regulation of the half-bridge current and the DC link voltage To keep lamp power as low as possible, although the necessary for the control Setpoints are derived from a common reference value.
  • the one for this necessary circuitry is extremely low.
  • the present invention is not limited to the example of an electronic ballast shown, but can generally be used in electronic circuits for operating Illuminants - e.g. LEDs or halogen lamps - are used where two controlled parameters are combined with each other, the setpoints for the Control loops can be derived from a common reference.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Processing Of Color Television Signals (AREA)
  • Analogue/Digital Conversion (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP01125076A 2001-10-22 2001-10-22 Correction d'erreurs des valeurs de référence dans circuits électroniques Expired - Lifetime EP1304908B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT01125076T ATE327651T1 (de) 2001-10-22 2001-10-22 Fehlerkorrektur von referenzwerten in elektronischen schaltungen
DE50109891T DE50109891D1 (de) 2001-10-22 2001-10-22 Fehlerkorrektur von Referenzwerten in elektronischen Schaltungen
EP01125076A EP1304908B1 (fr) 2001-10-22 2001-10-22 Correction d'erreurs des valeurs de référence dans circuits électroniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01125076A EP1304908B1 (fr) 2001-10-22 2001-10-22 Correction d'erreurs des valeurs de référence dans circuits électroniques

Publications (2)

Publication Number Publication Date
EP1304908A1 true EP1304908A1 (fr) 2003-04-23
EP1304908B1 EP1304908B1 (fr) 2006-05-24

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EP01125076A Expired - Lifetime EP1304908B1 (fr) 2001-10-22 2001-10-22 Correction d'erreurs des valeurs de référence dans circuits électroniques

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EP (1) EP1304908B1 (fr)
AT (1) ATE327651T1 (fr)
DE (1) DE50109891D1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4847797A (en) * 1986-03-25 1989-07-11 Gte Telecommicazioni S.P.A. Adaptive blind equilization method and device
US5610776A (en) * 1994-04-27 1997-03-11 Samsung Electronics Co., Ltd. Method of optimizing read channel of disk drive recording apparatus by using error rate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4847797A (en) * 1986-03-25 1989-07-11 Gte Telecommicazioni S.P.A. Adaptive blind equilization method and device
US5610776A (en) * 1994-04-27 1997-03-11 Samsung Electronics Co., Ltd. Method of optimizing read channel of disk drive recording apparatus by using error rate

Also Published As

Publication number Publication date
ATE327651T1 (de) 2006-06-15
DE50109891D1 (de) 2006-06-29
EP1304908B1 (fr) 2006-05-24

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