EP0699986A2 - Circuit et méthode pour la régulation de tension - Google Patents

Circuit et méthode pour la régulation de tension Download PDF

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Publication number
EP0699986A2
EP0699986A2 EP95305670A EP95305670A EP0699986A2 EP 0699986 A2 EP0699986 A2 EP 0699986A2 EP 95305670 A EP95305670 A EP 95305670A EP 95305670 A EP95305670 A EP 95305670A EP 0699986 A2 EP0699986 A2 EP 0699986A2
Authority
EP
European Patent Office
Prior art keywords
voltage
regulator
output
power supply
input
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Withdrawn
Application number
EP95305670A
Other languages
German (de)
English (en)
Other versions
EP0699986A3 (fr
Inventor
Eric J. Danstrom
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.)
STMicroelectronics lnc USA
Original Assignee
SGS Thomson Microelectronics Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SGS Thomson Microelectronics Inc filed Critical SGS Thomson Microelectronics Inc
Publication of EP0699986A2 publication Critical patent/EP0699986A2/fr
Publication of EP0699986A3 publication Critical patent/EP0699986A3/fr
Withdrawn legal-status Critical Current

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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
    • G05F1/563—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 including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation

Definitions

  • This invention relates to electronic circuits used to regulate voltages and more specifically to high efficiency voltage regulators used in the automotive industry.
  • FIG. 1 shows a voltage regulator in the prior art.
  • the linear voltage regulator 10 would receive an unregulated battery voltage Vbatt to provide a regulated output voltage Vout.
  • the unregulated battery voltage Vbatt 12 varies from around 12 volts to around 14.5 volts.
  • the regulated output voltage is typically 5 volts, providing around 1 amp of current.
  • the problem with this approach is that the linear voltage regulator is very inefficient.
  • Figure 2 shows a conventional approach for improving the efficiency of the circuit in figure 1.
  • Figure 2 shows a battery voltage Vbatt powering a switching mode power supply 22 (SMPS).
  • Switching mode power supplies of the type shown are taught in such text books as High Frequency Switching Power Supplies...Theory and Design by George Chryssis and is fully incorporated into this specification by reference.
  • the SMPS 22 typically provides an 8 volt output 24 at about a 90% efficiency.
  • the linear regulator uses the 8 volt output 24 and provides the same 5 volt 1 amp output as in figure 1.
  • the invention can be summarized as a circuit and method for providing an efficient voltage regulator.
  • the improved voltage regulator uses a switching mode power supply, a linear regulator, and a feedback loop having an output connected to the feedback input of the switching mode power supply so that the switching mode power supply provides an output voltage responsive to the voltage drop across the voltage regulator.
  • Fig. 1 is an electrical schematic of a voltage regulator as known in the prior art.
  • Fig. 2 is an electrical schematic of a SMPS in series with a linear regulator as known in the prior art.
  • Fig. 3 is electrical schematic of an embodiment of an efficient voltage regulator.
  • Fig. 4 is electrical schematic of the preferred embodiment of an efficient voltage regulator.
  • Fig. 5 is an electrical schematic of an efficient voltage regulator in an automobile system.
  • a switching mode power supply (SMPS)32 receives an unregulated voltage Vbatt 30.
  • the lowered voltage output of the SMPS 32 at node 34 is connected to a conventional linear regulator 36 which presents a regulated voltage Vreg.
  • a differential amplifier 40 has a first input connected to the lowered voltage at node 34 and has a second input connected to the regulated output Vreg 38.
  • the first input can be the inverted input or the non-inverted input as the choice is matter of the designers preference.
  • the differential amplifier generates an error signal 44 which is connected to the feed back input of the SMPS 32.
  • the switching mode power supply 30 is powered by Vbatt 30 and generates a lowered voltage at node 34.
  • the linear regulator 36 is powered by the lowered voltage at node 34 and produces a regulated voltage Vreg at node 38.
  • the feed back loop circuit 42 operates by the differential amplifier 40 sensing the voltage drop (Vreg-V34) across the linear regulator and generating an error signal 44 proportional to this voltage drop.
  • the error signal 44 is fed back to the SMPS 32 so that the SMPS 32 can provide a lowered voltage at node 34 which optimizes the voltage drop across the linear regulator.
  • Figure 4 shows a detailed description of the embodiment in figure 3. More specifically, the linear regulator 36 in figure 3 is described in detail in figure 4.
  • the SMPS 52 is connected to Vbatt at node 50 and provides a lowered voltage at node 54.
  • the linear regulator 72 includes a pnp bipolar transistor 56, a differential amplifier 62, a resistor 58, a resistor 60, and a band gap voltage reference 64.
  • the emitter of transistor 56 is connected to SMPS 52 at node 54 and to a first input of differential amplifier 68.
  • the collector of transistor 56 is connected to the second input of differential amplifier 68 and resistor 58.
  • the other end of resistor 58 is connected to resistor 60 and the inverting input of differential amplifier 62.
  • the non-inverting input of differential amplifier 62 is connected to a band gap voltage reference 64.
  • the output of differential amplifier 62 is connected to the base of transistor 56.
  • the output to differential amplifier 68 is connected to the feedback input of the SMPS 52.
  • the SMPS 52 is powered by Vbatt at node 50 and generates a lowered voltage at node 54 which is used to power linear regulator 72.
  • the linear regulator operates by controlling the conductivity of transistor 56 based on the comparison of a band gap reference voltage 64 to a scaled voltage.
  • the scaled voltage is generated by resistors 58 and 60 placed in series across the output of linear regulator 72.
  • the output voltage is controlled by adjusting the ratio of resistors 58 and 60 and/or adjusting the band gap reference voltage 64, as is well known in the art.
  • the differential amplifier generates an error signal 70 proportional to the voltage drop across the pass element (transistor 56).
  • the error signal is fed back to SMPS 52 so that the SMPS 52 can provide the optimal lowered voltage at node 54 to maintain the optimum voltage drop across transistor 56.
  • Figure 5 describes the use of the efficient voltage regulator in an automobile.
  • the battery has a negative terminal connected to chassis ground and a positive terminal connected to an alternator 82 and an efficient voltage regulator 84 (such as the one described in figure 4).
  • the efficient voltage regulator 84 supplies a regulated voltage Vreg to the on board electronics of an automobile.
  • the on board electronics 86 of an automobile may be an ignition control system, climate control system, on board diagnostics, and the like.
  • the alternator converts the mechanical energy of an automobile motor into electrical energy, which is stored in the battery 80.
  • the efficient voltage regulator 84 regulates the battery voltage for the on board electronics 86.
  • the on board electronics 86 are used to increase the gas milage, lower emissions, and/or provide consumer features such as climate control.

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)
  • Dc-Dc Converters (AREA)
  • Control Of Amplification And Gain Control (AREA)
EP95305670A 1994-08-31 1995-08-15 Circuit et méthode pour la régulation de tension Withdrawn EP0699986A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29860894A 1994-08-31 1994-08-31
US298608 1994-08-31

Publications (2)

Publication Number Publication Date
EP0699986A2 true EP0699986A2 (fr) 1996-03-06
EP0699986A3 EP0699986A3 (fr) 1996-09-04

Family

ID=23151254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95305670A Withdrawn EP0699986A3 (fr) 1994-08-31 1995-08-15 Circuit et méthode pour la régulation de tension

Country Status (2)

Country Link
EP (1) EP0699986A3 (fr)
JP (1) JPH08106333A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6441591B2 (en) 2000-03-17 2002-08-27 Nokia Mobile Phones Ltd. Linear regulator with conditional switched mode preregulation
WO2003021766A2 (fr) * 2001-08-29 2003-03-13 Tropian Inc. Traitement d'alimentation electrique pour des amplificateurs de puissance
WO2008135519A1 (fr) * 2007-05-04 2008-11-13 Nokia Corporation Dispositif
WO2013101433A1 (fr) * 2011-12-30 2013-07-04 Intel Corporation État de sommeil de processeur à affichage actif
CN105676926A (zh) * 2016-03-22 2016-06-15 杨国锋 一种便于安装的家用稳压器
WO2018084938A1 (fr) * 2016-11-04 2018-05-11 Qualcomm Incorporated Contrôleur de charge configurable
DE102019107761A1 (de) * 2019-03-26 2020-10-01 Endress+Hauser Conducta Gmbh+Co. Kg Schaltreglerschaltung, Feldgerät und Verfahren zur Stromversorgung
EP3916128A1 (fr) * 2020-05-27 2021-12-01 iCor Intelligent Corrosion Control GmbH Circuit de protection cathodique contre la corrosion et agencement de mesure lors de la protection cathodique contre la corrosion

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020038627A (ko) * 2002-04-01 2002-05-23 김진국 직류전원 공급장치에 출력전압 변경요구 데이터를송출하는 기능이 있는 직류전원으로 작동하는 기기
KR20020038628A (ko) * 2002-04-01 2002-05-23 김진국 출력전압 가변대응이 가능한 스위칭전원 공급장치
US9891646B2 (en) * 2015-01-27 2018-02-13 Qualcomm Incorporated Capacitively-coupled hybrid parallel power supply

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679130A (en) * 1986-06-04 1987-07-07 Superior Manufacturing & Instrument Corporation Programmable power supply
US4893228A (en) * 1987-09-01 1990-01-09 Hewlett Packard Company High-efficiency programmable power supply
JPH04259017A (ja) * 1991-02-14 1992-09-14 Brother Ind Ltd 直流電源装置
US5563498A (en) * 1991-07-17 1996-10-08 Halcro Nominees Pty Ltd. Power supply regulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6441591B2 (en) 2000-03-17 2002-08-27 Nokia Mobile Phones Ltd. Linear regulator with conditional switched mode preregulation
WO2003021766A2 (fr) * 2001-08-29 2003-03-13 Tropian Inc. Traitement d'alimentation electrique pour des amplificateurs de puissance
WO2003021766A3 (fr) * 2001-08-29 2003-12-31 Tropian Inc Traitement d'alimentation electrique pour des amplificateurs de puissance
US6781452B2 (en) 2001-08-29 2004-08-24 Tropian, Inc. Power supply processing for power amplifiers
US6924695B2 (en) 2001-08-29 2005-08-02 Tropian, Inc. Power supply processing for power amplifiers
US7038536B2 (en) 2001-08-29 2006-05-02 Tropian, Inc. Power supply processing for power amplifiers
US7642847B2 (en) 2001-08-29 2010-01-05 Panasonic Corporation Power supply processing for power amplifiers
WO2008135519A1 (fr) * 2007-05-04 2008-11-13 Nokia Corporation Dispositif
WO2013101433A1 (fr) * 2011-12-30 2013-07-04 Intel Corporation État de sommeil de processeur à affichage actif
US9323307B2 (en) 2011-12-30 2016-04-26 Intel Corporation Active display processor sleep state
CN105676926A (zh) * 2016-03-22 2016-06-15 杨国锋 一种便于安装的家用稳压器
WO2018084938A1 (fr) * 2016-11-04 2018-05-11 Qualcomm Incorporated Contrôleur de charge configurable
US10185342B2 (en) 2016-11-04 2019-01-22 Qualcomm Incorporated Configurable charge controller
DE102019107761A1 (de) * 2019-03-26 2020-10-01 Endress+Hauser Conducta Gmbh+Co. Kg Schaltreglerschaltung, Feldgerät und Verfahren zur Stromversorgung
EP3715997A3 (fr) * 2019-03-26 2020-10-21 Endress + Hauser Conducta GmbH + Co. KG Circuit de régulateur de commutation, dispositif de champ et procédé d'alimentation électrique
US11159087B2 (en) 2019-03-26 2021-10-26 Endress+Hauser Conducta Gmbh+Co. Kg Switching regulator circuit, field device and power supply method
EP3916128A1 (fr) * 2020-05-27 2021-12-01 iCor Intelligent Corrosion Control GmbH Circuit de protection cathodique contre la corrosion et agencement de mesure lors de la protection cathodique contre la corrosion

Also Published As

Publication number Publication date
EP0699986A3 (fr) 1996-09-04
JPH08106333A (ja) 1996-04-23

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