WO2008009195A1 - Procédé de compensation de signaux pour isolateurs de signaux passifs - Google Patents

Procédé de compensation de signaux pour isolateurs de signaux passifs Download PDF

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Publication number
WO2008009195A1
WO2008009195A1 PCT/CN2007/001599 CN2007001599W WO2008009195A1 WO 2008009195 A1 WO2008009195 A1 WO 2008009195A1 CN 2007001599 W CN2007001599 W CN 2007001599W WO 2008009195 A1 WO2008009195 A1 WO 2008009195A1
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WO
WIPO (PCT)
Prior art keywords
transformer
compensation
signal
primary
main transformer
Prior art date
Application number
PCT/CN2007/001599
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English (en)
Chinese (zh)
Inventor
Xiangyang Yin
Dingmin Mo
Original Assignee
ZHANG, Jiaoru
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 ZHANG, Jiaoru filed Critical ZHANG, Jiaoru
Publication of WO2008009195A1 publication Critical patent/WO2008009195A1/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
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type

Definitions

  • the present invention relates to a simple circuit for implementing a signal compensation method for a passive signal isolator.
  • the passive signal isolator comprises a complementary triode pair and a capacitor.
  • DC-DC half-bridge circuit, half-bridge self-excited oscillation circuit mainly composed of D101 and drive transformer, 1:1 signal-coupled main transformer and secondary rectifier circuit of main transformer, wherein the primary transformer of the main transformer in the circuit connection
  • the drive transformers are connected in series, and the secondary of the drive transformer is directly connected to the half-bridge self-excited oscillation circuit.
  • the passive signal isolator chopping the input DC signal through the half-bridge circuit and the half-bridge self-oscillation circuit to make it an AC signal, and then coupling the energy from the primary to the secondary by means of a 1:1 main transformer coupling. Level, and finally rectify the output to drive the load. Since in theory the signal coupling process follows the law that the turns ratio of the primary and secondary coils is equal to the inverse ratio of the primary and secondary coil currents, the isolated transmission of the signal can be achieved.
  • the energy of the signal passes through the transformer coupling process due to factors such as copper loss and iron loss. It is inevitable that there is energy loss, or the magnetic flux is diverging outward, or the secondary end can not achieve ideal rectification and other factors. It does not completely follow the 1:1 transmission to form an error.
  • the error of this signal is often expressed as the current signal at the secondary side is slightly smaller than the primary end signal.
  • the object of the invention is to use a simple and easy to implement method for this small error Compensation is performed to achieve higher signal transmission accuracy of the passive signal isolator.
  • a signal compensation method for a passive signal isolator in which a compensation transformer is added in the passive signal isolator circuit, the primary of the compensation transformer and the primary or the main transformer in the circuit
  • the secondary series, the one end of the compensation transformer secondary is connected to the lead wire to increase the output current through the main transformer toroidal core and then according to the function of the compensation transformer; the primary and secondary coil turns ratio of the compensation transformer is compensated by the required compensation
  • the error size is derived.
  • the compensation transformer has a larger turns ratio of the coil, assuming that the ratio is n, that is, the number of turns of the secondary coil is n times the number of turns of the primary coil; when an alternating current I flows through the primary coil of the compensation transformer, the secondary The coil generates an alternating current of IX 1/n; in the case where the secondary of the compensation transformer passes through the toroidal core of the main transformer, the magnetic field strength of the main transformer can be increased by 1/n, so that the isolated transmission of the signal is 1/n.
  • the compensation amount is doubled to improve the accuracy of the passive signal isolator.
  • the invention adopts a driving transformer in a passive signal isolator circuit as a compensation transformer.
  • the primary of the main transformer is connected in series with the driving transformer, and one end of the driving transformer secondary is connected to the toroidal core of the main transformer, and then connected to the half bridge. In the oscillation circuit.
  • the primary transformer of the compensation transformer of the present invention is connected between the main transformer and the primary of the drive transformer, and one end of the compensation transformer secondary is connected to the other end of the secondary of the compensation transformer after passing through the main transformer toroidal core.
  • the primary of the compensation transformer of the present invention is connected in series with the secondary of the main transformer, and one end of the compensation transformer secondary is connected to the other end of the secondary of the compensation transformer after passing through the toroidal core of the main transformer.
  • a signal compensation method for a passive signal isolator a winding is added to a main transformer in a passive signal isolator circuit, and a driving transformer in a passive signal isolator circuit After the secondary is connected in series with the additional winding, it is connected to the half-bridge self-oscillating circuit, and the turns ratio of the additional winding is determined by the error of the required compensation.
  • the invention adds a compensation transformer, and the secondary of the compensation transformer penetrates into the main transformer, and uses the energy of the primary coil of the main transformer to superimpose the strength of the magnetic field line required for the error compensation inside the main transformer core, thereby compensating for the transmission distortion of the signal, and the loss
  • the current signal is compensated.
  • this compensation is a proportional compensation for the current signal, which does not affect the linearity of the signal, and at the same time improves the accuracy.
  • FIG. 1 is a schematic diagram of a connection according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of connection according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic diagram of a connection according to Embodiment 3 of the present invention.
  • Figure 5 is a schematic diagram of the connection of the fifth embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a connection according to Embodiment 6 of the present invention.
  • Figure 7 is a schematic view showing the structure of the secondary of the compensation transformer passing through the main transformer core.
  • ⁇ + is the positive terminal of the signal input to the current signal
  • ⁇ - is the negative terminal of the signal input to the current signal.
  • Q100 is an NPN and PNP complementary triode pair, and a complementary triode pair Q100
  • the capacitors C104, C105 form a typical DC DC half-bridge circuit.
  • Resistors R101, R102 are triode-to-bias current resistors.
  • the capacitors C100, C101, C102 and D101 (triode pairs composed of NPN and PNP) and the drive transformer L2 form a self-oscillating circuit of a half bridge.
  • the driving transformer L2 drives the base of the transistor pair and is also a compensation transformer.
  • the main transformer L1 is a 1:1 signal coupling transformer, and the secondary of the main transformer is a rectifying circuit.
  • the circuit works as follows:
  • the resistors R101 and R102 form a DC bias for the transistor pair Q100.
  • the capacitors C104 and C105 form a path relative to the starting moment, and the driving transformer L2 does not instantaneously due to the coil end voltage.
  • the equilibrium relationship always has a current flowing in a direction that is undefined in advance. Assume that the current flows from pin 1 to pin 2. Then there is a current flowing through pins 1 and 2 of L2, flowing through pins 4 and 5 of Q100, flowing through pins 1 and 3 of D101, and returning to pin 1 of L2 to form a loop.
  • the PNP tube of Q100 is turned on, causing the current to flow from Ii+ through capacitor C104, flowing through pins 1 and 2 of main transformer L1, flowing through pins 3 and 2 of drive transformer L2, and flowing back through pins 4 and 3 of Q100.
  • Ii - forms a loop that completes the positive chopping of the DC signal.
  • the current flows through the 3 and 2 pins for the drive transformer L2 and the electric flow growth trend causes the current flowing through the 4 and 5 pins of the Q100 to increase, further accelerating the current flowing through the pins 1 and 2 of the L1.
  • the positive feedback that forms the current also causes the core of the drive transformer L2 to quickly reach saturation. After that, the voltage of the storage coil of the transformer L2 is reversed, and the electrical flow of the two circuits is reduced.
  • the current flowing through the driving transformer L2 is reduced, causing the driving transformer L2 to invert the base-to-base driving voltage of the triode, and at the same time causing the current to be inverted.
  • the NPN tube When the inverting voltage reaches a certain value, the NPN tube is turned on, and the PNP tube is turned off. The two loop currents are inverted. In the same way, the reverse chopping of the DC signal is completed.
  • the forward and reverse chopping signals are coupled via the L1 transformer After secondary rectification, it is output by Io+ and Io-.
  • the lead taps of the secondary coil are taken out by the driving transformer L2 (the coils of 1 to 2 are secondary, and the coils of 2 to 3 are primary) penetrate the toroidal core of the main transformer, in order to compensate the secondary lead tap of the transformer.
  • the connection after passing through H is convenient and stable.
  • the compensation amount is calculated as follows:
  • the ratio of the turns of the main transformer is 1:1, and the distortion of the current signal in the main transformer is 0.5%, that is, the output of the signal is only 99.5%, so the theoretical compensation for the signal should be 0. 5%.
  • the isolated transmission of the signal is one-hundredth of a 5% compensation, which improves the accuracy of the passive signal isolator.
  • the secondary of the driving transformer does not penetrate the core of the main transformer, and an isolated compensation transformer L3 is added, and the primary and secondary pins of the compensation transformer L3 are connected in series to the main transformer L1 and the drive.
  • the primary of the transformer L2 one end of the secondary of the compensation transformer L3 is connected to the toroidal core of the main transformer and connected to the other end of the secondary transformer to form a compensation loop.
  • the calculation of the coil ratio of the compensation transformer L3 is compared with the above-mentioned embodiment of FIG. the same. As shown in FIG. 3, this embodiment is basically the same as the embodiment of FIG.
  • the compensation transformer adopts an autotransformer, and the primary and the second legs of the transformer L3 are serially connected to the primary circuit of the main transformer, and the secondary three legs are worn.
  • the toroidal core of the main transformer is connected to the secondary 2 pin to form a loop for compensation.
  • the secondary of the driving transformer does not penetrate the core of the main transformer, and an isolated compensation transformer L3 is added to compensate the secondary connection of the primary of the transformer L3 and the main transformer, and the compensation transformer L3
  • One end of the secondary connection leads through the main transformer toroidal core and is connected to the other end of the compensation transformer secondary to form a compensation loop.
  • this embodiment is basically the same as the embodiment of FIG. 4, except that the compensation transformer adopts an autotransformer, and the primary and secondary legs of the transformer L3 are serially connected to the secondary circuit of the main transformer, and the secondary 3 legs are The toroidal core passing through the main transformer is connected to the secondary pin 2 to form a loop for compensation.
  • a winding with a smaller number of turns is added to the main transformer, and the secondary of the driving transformer L2 is connected in series with the windings 5 and 6 of the winding, and the 6th leg of the winding is connected to the 3 pin of the D101.
  • the additional winding coil turns ratio is derived from the magnitude of the error required to compensate, and the compensation transformer turns ratio is calculated as described above.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un procédé de compensation de signaux pour des isolateurs de signaux passifs, qui ajoute un transformateur de compensation dans le circuit d'isolation de signaux passifs. Dans ledit procédé, un enroulement primaire du transformateur de compensation est connecté en série à un enroulement primaire ou secondaire du transformateur primaire dans le circuit, un conducteur de l'enroulement secondaire du transformateur de compensation passe dans un noyau annulaire du transformateur primaire dans le sens de l'augmentation de courant, et le conducteur est connecté selon la fonction du transformateur de compensation. Le rapport du nombre de tours des enroulements primaire et secondaire du transformateur de compensation est obtenu par compensation d'erreur nécessaire, ce qui permet d'augmenter l'intensité de champ par 1/n fois du transformateur principal lorsque l'enroulement secondaire du transformateur de compensation passe dans le noyau annulaire du transformateur principal, de façon que la transmission d'isolation des signaux soit soumise à la compensation par 1/n fois et que la précision de l'isolateur de signaux passifs soit améliorée.
PCT/CN2007/001599 2006-07-11 2007-05-17 Procédé de compensation de signaux pour isolateurs de signaux passifs WO2008009195A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2006100364408A CN100517528C (zh) 2006-07-11 2006-07-11 一种无源信号隔离器的信号补偿方法
CN200610036440.8 2006-07-11

Publications (1)

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WO2008009195A1 true WO2008009195A1 (fr) 2008-01-24

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Application Number Title Priority Date Filing Date
PCT/CN2007/001599 WO2008009195A1 (fr) 2006-07-11 2007-05-17 Procédé de compensation de signaux pour isolateurs de signaux passifs

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CN (1) CN100517528C (fr)
WO (1) WO2008009195A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100392970C (zh) * 2006-07-11 2008-06-04 广州汉为电子科技有限公司 零偏置工作的无源信号隔离器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172244A (en) * 1977-06-02 1979-10-23 Licentia Patent-Verwaltungs-G.M.B.H. High voltage resistant signal transmission device with isolating transformer
JPS5565418A (en) * 1978-11-09 1980-05-16 Toshiba Corp Error compensating current transformer
CN2212828Y (zh) * 1994-07-27 1995-11-15 东北电业管理局科技开发公司电力电子设备厂 电压互感器二次回路压降补偿器
CN2251158Y (zh) * 1995-07-05 1997-04-02 顾元章 一种组合补偿式交流稳压器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172244A (en) * 1977-06-02 1979-10-23 Licentia Patent-Verwaltungs-G.M.B.H. High voltage resistant signal transmission device with isolating transformer
JPS5565418A (en) * 1978-11-09 1980-05-16 Toshiba Corp Error compensating current transformer
CN2212828Y (zh) * 1994-07-27 1995-11-15 东北电业管理局科技开发公司电力电子设备厂 电压互感器二次回路压降补偿器
CN2251158Y (zh) * 1995-07-05 1997-04-02 顾元章 一种组合补偿式交流稳压器

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CN1913062A (zh) 2007-02-14
CN100517528C (zh) 2009-07-22

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