WO2008043294A1 - Procédé et dispositif permettant de détecter la tension de sortie d'un transformateur - Google Patents

Procédé et dispositif permettant de détecter la tension de sortie d'un transformateur Download PDF

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Publication number
WO2008043294A1
WO2008043294A1 PCT/CN2007/070784 CN2007070784W WO2008043294A1 WO 2008043294 A1 WO2008043294 A1 WO 2008043294A1 CN 2007070784 W CN2007070784 W CN 2007070784W WO 2008043294 A1 WO2008043294 A1 WO 2008043294A1
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WO
WIPO (PCT)
Prior art keywords
voltage
output
transformer
operational amplifier
value
Prior art date
Application number
PCT/CN2007/070784
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English (en)
Chinese (zh)
Inventor
Dongping Yang
Original Assignee
Proview Technology (Shenzhen) Co., Ltd.
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 Proview Technology (Shenzhen) Co., Ltd. filed Critical Proview Technology (Shenzhen) Co., Ltd.
Publication of WO2008043294A1 publication Critical patent/WO2008043294A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means

Definitions

  • the invention relates to the technical field of power supply and power distribution, in particular to a transformer detection and control technology, and relates to a method and a device for detecting high-voltage arc pull of a double high output transformer. Background technique
  • Dual high-output transformers are used in many applications, especially in lamp power supplies, such as cold-cathode fluorescent lamps (CCFL, Cold Cathode Fluorescent Lamps).
  • Transformer working voltage up to 1500V or more.
  • the insulation performance of the high voltage transformer and its high voltage power supply circuit may decrease, and the possibility of high voltage arcing increases. Therefore, it is necessary to consider how to prevent high-voltage arcing in the output circuit of the dual high-output transformers in order to ensure that people can safely use CCFL-like products in their lives.
  • the prior art generally detects the voltage of the sample point on the secondary side of the transformer. When the voltage exceeds the set value, the control unit sends a control signal to stop the operation of the inverter circuit, and accordingly stops the operation of the transformer to protect, as shown in FIG. However, in some cases, the voltage does not increase significantly when the high voltage is pulled, and it is difficult to detect the high voltage arc by overpressure. Summary of the invention
  • the invention provides a detection and control method and device for high-voltage arc drawing of an output loop of a double high output transformer.
  • the invention provides a detection and control method for high-voltage arc drawing of an output loop of a double high output transformer, comprising:
  • the invention provides a device for detecting and controlling a high voltage arcing of an output loop of a dual high output transformer, comprising a voltage detecting unit and a first control unit,
  • the voltage detecting unit is configured to detect a voltage sample value of the two output ends of the transformer, and send the voltage sample value to the control unit;
  • the first control unit controls the inverter circuit of the driving transformer according to the difference between the two output voltage samples obtained by the voltage detecting unit;
  • the inverter circuit that controls the drive transformer stops operating.
  • the voltage ⁇ sample value of the two output ends of the transformer is obtained; whether the high voltage drawing arc occurs according to the difference between the obtained two output voltage ⁇ sample values; when the two output voltages are sampled When the difference exceeds the predetermined value, it is determined that a high voltage arc is generated, and the inverter circuit that controls the driving transformer is stopped, thereby effectively detecting and controlling the high voltage arcing phenomenon of the output circuit of the double high output transformer.
  • FIG. 1 is a schematic diagram of a high voltage pull-arc detection control system of a dual high output transformer output loop
  • FIG. 2 is a schematic diagram of a voltage detecting circuit in the prior art
  • FIG. 3 is a schematic diagram of a voltage detecting circuit in an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a voltage detecting circuit in another embodiment of the present invention. detailed description
  • Figure 1 shows the high-voltage output loop of the double-high transformer and the existing overvoltage detection and processing circuit.
  • the method of detecting the voltage value of the high voltage output at both ends of the transformer is such that two capacitors (CV1, CV11, CV2, CV22) are connected in series to the ground at each output end of the transformer, and the voltage division value of the capacitor to the ground is used as the The voltage output of the terminal is sampled.
  • the voltage detection circuit is a simple rectification and filtering circuit (not shown) that converts the AC signal into a DC signal and sends it to the control unit.
  • the control unit can be two operational amplifiers as shown in Figure 2. When any of the voltage samples Vsenl or Vsen2 exceeds the set value Vmaxset, the op amp output control signal turns off the inverter circuit.
  • the control unit detects two electric The voltage difference of the pressure sample, when the voltage difference exceeds the set value, the control unit controls the inverter circuit to be turned off, thereby providing protection.
  • the set value of the voltage difference can be about 15% of the output voltage across the transformer. Of course, it can be set according to different specific conditions.
  • the detection circuit provided in an embodiment of the present invention is two operational amplifiers as shown in FIG. 3.
  • the two voltage samples Vsenl and Vsen2 at the two output ends of the transformer are respectively connected to the in-phase terminal and the inverting phase of the first operational amplifier.
  • the output of the operational amplifier and the set value AVset are respectively connected to the non-inverting terminal and the inverting terminal of the second operational amplifier, and when the voltage difference between the two detecting points is input to the first operational amplifier, the output voltage value is greater than the setting.
  • the second op amp output signal controls the inverter circuit to stop working.
  • the distributed capacitance of the high-voltage output loop transformer of the double-high transformer is not balanced. Therefore, even if there is no high-voltage arcing, the voltage between the two ends of the transformer will be unbalanced, that is, two detections. There is an initial voltage difference at the point.
  • the compensation capacitor can be additionally added at the end of the distributed capacitance, so that the capacitance of the two output terminals of the transformer is relatively balanced, and the voltage of the two ends of the transformer to the ground is corresponding. It will also be balanced.
  • 4 is a control unit circuit of an operational amplifier combination with initial voltage difference compensation, two voltage samples Vsenl and Vsen2 at the two output ends of the transformer are respectively connected to the in-phase and inverting terminals of the first operational amplifier, the first operation
  • the output of the amplifier and the initial compensation value AV0 are respectively compensated by the voltage difference between the non-inverting terminal and the inverting terminal of the second operational amplifier, and the output of the second operational amplifier and the set value AVset are respectively connected to the third.
  • the non-inverting terminal and the inverting terminal of the operational amplifier when the difference between the output voltage value obtained by inputting the voltage difference between the two detection points to the first operational amplifier and the initial compensation value is greater than the set value A Vset
  • the output signal controls the inverter circuit to stop working.
  • the high-voltage pull-arc detection 'J processing device of the double-high output transformer output loop may further have another scheme, using a single-chip computer as the control unit in FIG. 1; detecting the high-voltage voltage outputted at both ends of the transformer
  • the sample value is connected to the A/D conversion interface of the single-chip computer.
  • the manner of controlling the inverter to open when the voltage value of any one of the detection points exceeds the set value is also retained in the prior art.
  • An apparatus for detecting and controlling a high-voltage arc of an output loop of a dual high-output transformer including a voltage detecting unit and a first control unit, provided in an embodiment of the present invention
  • the voltage detecting unit is configured to detect a voltage sample value of the two output ends of the transformer, and send the voltage sample value to the control unit;
  • the first control unit controls the inverter circuit of the driving transformer according to the difference between the two output voltage samples obtained by the voltage detecting unit;
  • the inverter circuit that controls the drive transformer stops operating.
  • the first control unit comprises first and second operational amplifiers
  • the non-inverting terminal and the inverting terminal of the first operational amplifier are respectively used for inputting a voltage value of a high voltage outputted across the detected transformer, and an output of the first operational amplifier and a predetermined value are respectively input to the second operational amplifier.
  • the non-inverting terminal and the inverting terminal when the output value of the first operational amplifier is greater than the predetermined value, the second operational amplifier outputs a signal to control the inverter circuit to stop operating.
  • the first control unit includes three operational amplifiers A, B, and C, and the non-inverting terminal and the inverting terminal of the operational amplifier A are respectively used to input a voltage sample value across the output of the transformer, the operation
  • the output of the amplifier A and the initial compensation value are respectively input to the non-inverting terminal and the inverting terminal of the operational amplifier B, and the output and the set value of the operational amplifier B are respectively input to the non-inverting terminal and the inverting terminal of the operational amplifier C;
  • the operational amplifier C When the output value of the operational amplifier C is greater than a set value, the operational amplifier C outputs a signal for controlling the inverter circuit to stop operating.
  • the high-voltage arc detecting control device further includes:
  • a second control unit configured to control, according to the two output voltage samples obtained by the voltage detecting unit, an inverter circuit that drives the transformer;
  • the second control unit controls the inverter circuit of the driving transformer to stop working.
  • the second control unit includes two operational amplifiers, and the non-inverting input terminals of the two operational amplifiers are respectively used for inputting a voltage of a high voltage output across the detected transformer, and the two operational amplifiers are The inverting input terminal respectively inputs the set voltage.
  • the corresponding operational amplifier outputs a high potential to control the inverter to stop working.
  • the voltage detecting unit is a rectifying and filtering circuit.
  • a balanced capacitor or load is connected between the one end of the two output terminals of the transformer and the ground.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

Cette invention concerne un procédé et un dispositif permettant de détecter la tension de sortie d'un transformateur. Le procédé consiste à détecter deux valeurs d'échantillonnage de tension produites par le transformateur, puis à réguler l'inverseur qui commande le transformateur de manière à interrompre le fonctionnement lorsque la différence entre les deux valeurs d'échantillonnage de tension est supérieure à une valeur fixée. Le dispositif comprend un bloc détecteur de tension conçu pour détecter deux valeurs d'échantillonnage de tension produites par le transformateur et un bloc de commande qui commande l'inverseur d'après la différence entre les deux valeurs d'échantillonnage de tension. Lorsque la différence entre les deux valeurs d'échantillonnage de tension est supérieure à la valeur fixée, le bloc de commande indique à l'inverseur de s'interrompre
PCT/CN2007/070784 2006-09-29 2007-09-26 Procédé et dispositif permettant de détecter la tension de sortie d'un transformateur WO2008043294A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2006100629682A CN101154802A (zh) 2006-09-29 2006-09-29 双高输出变压器输出回路高压拉弧的检测方法及处理装置
CN200610062968.2 2006-09-29

Publications (1)

Publication Number Publication Date
WO2008043294A1 true WO2008043294A1 (fr) 2008-04-17

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Application Number Title Priority Date Filing Date
PCT/CN2007/070784 WO2008043294A1 (fr) 2006-09-29 2007-09-26 Procédé et dispositif permettant de détecter la tension de sortie d'un transformateur

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CN (1) CN101154802A (fr)
WO (1) WO2008043294A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108872885B (zh) * 2018-05-29 2021-07-13 西安电子科技大学 交变磁场测量实验仪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63188912A (ja) * 1987-01-30 1988-08-04 Mitsubishi Electric Corp 誤差補償形変圧器
CN2266255Y (zh) * 1996-04-26 1997-10-29 倪正基 高可靠节能型霓虹灯电子变压器
JP2003217952A (ja) * 2002-01-23 2003-07-31 Sonoda Keiki Kogyo Kk 電流トランス
CN1698256A (zh) * 2003-03-28 2005-11-16 索尼株式会社 开关电源装置
JP2005322504A (ja) * 2004-05-10 2005-11-17 Matsushita Electric Ind Co Ltd 冷陰極管点灯装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63188912A (ja) * 1987-01-30 1988-08-04 Mitsubishi Electric Corp 誤差補償形変圧器
CN2266255Y (zh) * 1996-04-26 1997-10-29 倪正基 高可靠节能型霓虹灯电子变压器
JP2003217952A (ja) * 2002-01-23 2003-07-31 Sonoda Keiki Kogyo Kk 電流トランス
CN1698256A (zh) * 2003-03-28 2005-11-16 索尼株式会社 开关电源装置
JP2005322504A (ja) * 2004-05-10 2005-11-17 Matsushita Electric Ind Co Ltd 冷陰極管点灯装置

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