CN202816630U - Transformer for isolation amplifier - Google Patents
Transformer for isolation amplifier Download PDFInfo
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- CN202816630U CN202816630U CN 201220462892 CN201220462892U CN202816630U CN 202816630 U CN202816630 U CN 202816630U CN 201220462892 CN201220462892 CN 201220462892 CN 201220462892 U CN201220462892 U CN 201220462892U CN 202816630 U CN202816630 U CN 202816630U
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Abstract
The utility model discloses a transformer for an isolation amplifier. The transformer comprises an annular magnetic core, wherein the annular magnetic core is coiled with a primary winding and a secondary winding; a dotted terminal of the primary winding is connected with a DC (Direct Current) voltage source, and an unlike terminal of the primary winding is connected with a switching triode; and the secondary winding comprises four power supply windings, two demodulation windings and one modulation winding, the four power supply windings are respectively connected with a rectifying circuit, the switching triode is in a power transmission period when being switched on and is in a signal transmission period when being switched off, thus two functions of power transmission and signal transmission of the transformer disclosed by the utility model can be realized, the function of the power transmission is realized through the coupling between the primary winding and the power supply windings, and the function of the signal transmission is realized through the coupling between the primary winding and the modulation winding as well as between the primary winding and the demodulation windings. The transformer disclosed by the utility model has the advantages that the coupling capacitance is small, the isolation voltage is large, the leakage inductance is small, the size is small, and the like.
Description
Technical field
The utility model relates to electronic component, especially a kind of transformer that is applicable on the isolated amplifier.
Background technology
Isolated amplifier is a kind of amplifier that is connected in electric insulation between input circuit and the output circuit, adopts transformer or optical coupling transmission of signal, and at Industry Control, signal measurement and medicine equipment, the various aspects such as signal amplification obtain extensive use.The isolated amplifier effect is that analog signal is isolated, and amplifies according to certain ratio, requires the distorted signals of output little, and the linearity, precision, bandwidth, isolation is withstand voltage etc., and parameter all will reach instructions for use.
Generally speaking, transformer uses as simple function: a kind of function is through-put power, classifies as power transformer; Another kind of function is signal transmission, and realizes electrical isolation.
In the existing transformer coupled class isolated amplifier, realize above-mentioned two kinds of functions with two transformers, one is the power transformer of through-put power, and another is the transformer of realizing signal transmission or electrical isolation function.Because with separately magnetic core, to the transformer of individual transmission signal or electrical isolation function, isolation voltage or coupling capacitance between each winding are less demanding, adopt the structure of Double-wire parallel wound to get final product respectively for two kinds of transformers.Applicant is in the work of the transformer coupled class isolated amplifier of trial-production, run into transformer and made a difficult problem, because the transformer coupled class isolated amplifier of applicant trial-production, customer requirements significantly reduces its volume, be merely able to use a transformer, this transformer must be finished the transmission of power and signal simultaneously, demodulation winding symmetry and high conformity in the transformer of requirement signal transmission, if adopt existing Double-wire parallel wound structure, symmetry and consistency between the winding reach requirement, but the coupling capacitance between two windings is too large, and isolation voltage is too little, can not satisfy the product requirement on electric performance, therefore the structure of common Double-wire parallel wound can not reach the requirement of a transformer of above-mentioned use.
The utility model content
The applicant is for the above-mentioned customer requirements that significantly reduces transformer coupled class isolated amplifier volume, is merely able to use a transformer, a kind of transformer for isolated amplifier is provided, it can either through-put power, again can signal transmission, and the realization electrical isolation, and have that leakage inductance is little, the advantage of demodulation winding symmetry and high conformity.
The technical scheme that the utility model adopts is as follows:
A kind of transformer for isolated amplifier is characterized in that:
Comprise toroidal core 1, be wound with former limit winding W1 and secondary winding on the toroidal core 1:
Former limit winding W1, its Same Name of Ends connects a direct current voltage source, and the different name end of former limit winding W1 is connected with the collector electrode of switch triode T, and the base stage of switch triode T is inputted a pulse voltage, the grounded emitter of switch triode T;
The secondary winding comprises the first power supply winding W2～the 4th power supply winding W5, the first demodulation winding W6 and the second demodulation winding W7 and modulation winding W8;
Described the first power supply winding W2～the 4th power supply winding W5 connects respectively rectification circuit;
The syndeton of described the first demodulation winding W6 is: the different name end of the first demodulation winding W6 connects the input of level shift circuit, the output end vo ut1 of the first level shift circuit is connected with the input demodulator, and the Same Name of Ends of the first demodulation winding W6 is connected with the earth terminal of described level shift circuit; The different name end of the first demodulation winding W6 also is connected with the negative pole of the 6th diode D6, the six filtering capacitor C6 ground connection of the positive pole of the 6th diode D6 by connecting;
The syndeton of described the second demodulation winding W7 is: the different name end of the second demodulation winding W7 connects the input of level shift circuit, the output end vo ut2 of second electrical level shift circuit is connected with output demodulator, and the Same Name of Ends of the second demodulation winding W7 is connected with the earth terminal of described level shift circuit; The different name end of the second demodulation winding W7 also is connected with the negative pole of the 7th diode D7, the seven filtering capacitor C7 ground connection of the positive pole of the 7th diode D7 by connecting;
The syndeton of described modulation winding W8 is: the Same Name of Ends of modulation winding W8 is connected with the negative pole of the 8th diode D8, and the positive pole of the 8th diode D8 connects the output of modulator, and the different name end of modulation winding W8 is connected with the earth terminal of described modulator.
As further improvement in the technical proposal:
The rectification circuit that described the first power supply winding W2 and the 4th power supply winding W5 connect respectively is: the Same Name of Ends of the Same Name of Ends of the first power supply winding W2 and the 4th power supply winding W5 is connected with the positive pole of the second diode D2 and the 5th diode D5 respectively, the negative pole of the second diode D2 and the 5th diode D5 is respectively the power supply output, and described power supply output connects respectively the second filtering capacitor C2 and the 5th filtering capacitor C5; The rectification circuit that described the second power supply winding W3 and the 3rd power supply winding W4 connect respectively is: the different name end of the different name end of the second power supply winding W3 and the 3rd power supply winding W4 is connected with the negative pole of the 3rd diode D3 and the 4th diode D4 respectively, the positive pole of the 3rd diode D3 and the 4th diode D4 is respectively the power supply output, and described power supply output connects respectively the 3rd filtering capacitor C3 and the 4th filtering capacitor C4.
The number of turn and the inductance value of described the first demodulation winding W6 and the second demodulation winding W7 are identical, and the Same Name of Ends position of the first demodulation winding W6 and the second demodulation winding W7 is symmetrical take the axis by toroidal core 1 center as mirror image;
Described the first power supply winding W2 and the 3rd power supply winding W4 and the second power supply winding W3 and the 4th power supply winding W5 lay respectively at the two ends of toroidal core 1, and are respectively the Double-wire parallel wound structure;
The initiating terminal of described each coil windings and clearing end are stranded by the insulation extexine.
The beneficial effects of the utility model are as follows:
(1) the utility model is around in former limit winding and secondary winding on the same toroidal core, former limit winding connecting valve transistor circuit, it is the cycle of the utility model through-put power during the switch triode conducting, it is the cycle of signal transmission during the switch triode cut-off, so that the utility model is realized through-put power and two kinds of functions of signal transmission; The coupling of its limit, Central Plains winding and power supply winding realizes the function of through-put power, the function of the coupling realization signal transmission of former limit winding and modulation winding and demodulation winding;
(2) the power supply winding adopts the L-type filter that rectifier diode and filtering capacitor consist of, and circuit structure is simple, and cost is low;
(3) first demodulation winding W6 are identical with the number of turn and the inductance value of the second demodulation winding W7, and the winding structure of employing mirror image symmetry, the winding structure of common transformer in the prior art, its consistency and symmetry (inductance value) exceed 3-5 doubly, thereby satisfy the instructions for use of product electrical property;
(4) first power supply winding W2 and the second power supply winding W4 and the second power supply winding W3 and the 4th winding W5 that powers lays respectively at the two ends of toroidal core 1, and is respectively the Double-wire parallel wound structure, make easily and around two coil electric characteristics reach an agreement;
(5) initiating terminal of each coil windings and clearing end are stranded by the insulation extexine, improve the closed performance of each coil, reduce leakage field, are conducive to the satisfied first balanced, symmetrical performance of transferring winding W6 and the second demodulation winding W7 of separating.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is the utility model switch triode working state figure.
Wherein: toroidal core-1; Switch triode-T; Former limit winding-W1; First power supply winding-W2, second power supply winding-W3, the 3rd power supply winding-W4, the 4th power supply winding-W5; First demodulation winding-W6, second demodulation winding-W7; Modulation winding-W8; The second diode-D2, the 3rd diode-D3, the 4th diode-D4, the 5th diode-D5, the 6th diode-D6, the 7th diode-D7, the 8th diode-D8; The second filtering capacitor-C2, the 3rd filtering capacitor-C3, the 4th filtering capacitor-C4, the 5th filtering capacitor-C5, the 6th filtering capacitor-C6, the 7th filtering capacitor-C7; Output-the Vout1 of the first level shift circuit; Output-the Vout2 of second electrical level shift circuit; The first ground connection-GND1, the second ground connection-GND2.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described.
As shown in Figure 1, the utility model comprises toroidal core 1, is wound with former limit winding W1 and secondary winding on the toroidal core 1:
See Fig. 2, former limit winding W1, its Same Name of Ends connect a direct current voltage source (15V), and the different name end of former limit winding W1 is connected with the collector electrode of switch triode T, and the base stage of switch triode T is inputted a pulse voltage, the grounded emitter of switch triode T;
The secondary winding comprises the first power supply winding W2～the 4th power supply winding W5, the first demodulation winding W6 and the second demodulation winding W7 and modulation winding W8;
The first power supply winding W2～the 4th power supply winding W5 connects respectively rectification circuit; The rectification circuit that the first power supply winding W2 and the 4th power supply winding W5 connect respectively is: the Same Name of Ends of the Same Name of Ends of the first power supply winding W2 and the 4th power supply winding W5 is connected with the positive pole of the second diode D2, the 5th diode D5 respectively, the negative pole of the second diode D2, the 5th diode D5 is respectively the power supply output, and the power supply output connects respectively the second filtering capacitor C2, the 5th filtering capacitor C5; The rectification circuit that the second power supply winding W3 and the 3rd power supply winding W4 connect respectively is: the different name end of the different name end of the second power supply winding W3 and the 3rd power supply winding W4 is connected with the negative pole of the 3rd diode D3, the 4th diode D4 respectively, the positive pole of the 3rd diode D3, the 4th diode D4 is respectively the power supply output, and the power supply output connects respectively the 3rd filtering capacitor C3, the 4th filtering capacitor C4.
The syndeton of the first demodulation winding W6 is: the different name end of the first demodulation winding W6 connects the input of level shift circuit, the output end vo ut1 of the first level shift circuit is connected with the input demodulator, and the Same Name of Ends of the first demodulation winding W6 is connected with the earth terminal of level shift circuit; The different name end of the first demodulation winding W6 is connected with the negative pole of the 6th diode D6, the six filtering capacitor C6 ground connection (first ground connection GND1) of the positive pole of the 6th diode D6 by connecting;
The syndeton of the second demodulation winding W7 is: the different name end of the second demodulation winding W7 connects the input of level shift circuit, the output end vo ut2 of second electrical level shift circuit is connected with output demodulator, and the Same Name of Ends of the second demodulation winding W7 is connected with the earth terminal of level shift circuit; The different name end of the second demodulation winding W7 is connected with the negative pole of the 7th diode D7, the seven filtering capacitor C7 ground connection (second ground connection GND2) of the positive pole of the 7th diode D7 by connecting;
The syndeton of modulation winding W8 is: the Same Name of Ends of modulation winding W8 is connected with the negative pole of the 8th diode D8, and the positive pole of the 8th diode D8 connects the output of modulator, and the different name end of modulation winding W8 is connected with the earth terminal of modulator.
The first power supply winding W2 and the 3rd power supply winding W4 and the second power supply winding W3 and the 4th power supply winding W5 lay respectively at the two ends of toroidal core 1, and are respectively the Double-wire parallel wound structure.
The number of turn and the inductance value of the first demodulation winding W6 and the second demodulation winding W7 are identical, and the Same Name of Ends position of the first demodulation winding W6 and the second demodulation winding W7 is symmetrical take the axis by toroidal core 1 center as mirror image.
Above-mentioned level shift circuit, input demodulator, output demodulator are all prior art.
The consistency of the first demodulation winding W6 and the second demodulation winding W7 requires high (inductance value is identical) with symmetry.See Fig. 1, the first demodulation winding W6 and the second demodulation winding W7 are distributed in the up and down both sides of toroidal core 1 horizontal axis, the Same Name of Ends of the first demodulation winding W6 and the second demodulation winding W7 is symmetrical about toroidal core 1 horizontal axis mirror image, the length of magnetic path le of the first demodulation winding W6 and the former limit winding W1 of the second demodulation winding W7 winding distance equates, guarantees that the first demodulation winding W6 and the second demodulation winding W7 are consistent, symmetry.
Former limit winding W1, the first demodulation winding W6 and second its turn-to-turn of demodulation winding W7 should be evenly, closely, the initiating terminal of each coil windings and clearing end are stranded by the insulation extexine, in order to improve the closed performance of each coil, reduce leakage field, be conducive to the balanced, symmetrical performance of the first demodulation winding W6 and the second demodulation winding W7.Former limit winding W1, the first demodulation winding W6 and the second demodulation winding W7 coil turn are 8 circles, and the coil turn of the first power supply winding W2～the 4th power supply winding W5 is 5 circles, and the coil turn of modulation winding W8 is 3 circles.After tested, the inductance value error of the first demodulation winding W6 and the second demodulation winding W7 is less than 0.15%, and than adopting the precision of Double-wire parallel wound structure inductance value to improve 4 times at two magnetic cores respectively in the prior art, the leakage inductance of former limit winding W1 is less than 1.8%, isolation voltage is large, satisfies instructions for use fully.
Operation principle of the present utility model is as follows:
The utility model is through-put power and signal transmission simultaneously.
Seeing Fig. 2 and Fig. 3, is the power delivery cycle when switch triode T conducting:
The first power supply winding W2～the 4th power supply winding W5 induces just lower negative polarity of voltage, by the second diode D2～the 5th diode D5 rectification, and the filtering powering load by the second filtering capacitor C2～the 5th filtering capacitor C5, finish the through-put power function; Simultaneously, demodulation winding W6 and demodulation winding W7 polarity of voltage are upper just bearing down, and the 6th diode D6, the 7th diode D7 are in conducting state, provide-the drop-down level of 15V; Modulation winding W8 polarity of voltage is upper just lower negative, and the 8th diode D8 is in cut-off state, and modulator is not worked.
Seeing Fig. 2 and Fig. 3, is signal transmission cycle when switch triode T ends:
The first power supply winding W2～the 4th power supply winding W5 induces negative lower positive polarity of voltage, and at this moment, the second diode D2～the 5th diode D5 is in cut-off state, and power-supply rectifying loop (power delivery) do not work; The polarity of voltage of modulation winding W8 is that upper negative lower just the 8th diode D8 is in conducting state, and modulator is started working, and comes the size of the crest voltage in the control transformer by the size of current that flows through among the control modulation winding W8; The crest voltage that this moment, transformer primary side winding W1 produced induces just lower negative voltage at the first demodulation winding W6 and the second demodulation winding W7 respectively, the 6th diode D6, the 7th diode D7 are in cut-off state, provide signal to level shift circuit, the output end vo ut1 of the first level shift circuit is the demodulation input, the output end vo ut2 of second electrical level shift circuit is demodulation output, like this settling signal transfer function.
The utility model coupling capacitance is little, and isolation voltage is large, can satisfy the instructions for use of product electrical property.
More than describing is to explanation of the present utility model, is not the restriction to utility model, and the utility model limited range within protection range of the present utility model, can be done any type of modification referring to claim.
Claims (5)
1. transformer that is used for isolated amplifier is characterized in that:
Comprise toroidal core (1), be wound with former limit winding (W1) and secondary winding on the toroidal core (1):
Former limit winding (W1), its Same Name of Ends connect a direct current voltage source, and the different name end of former limit winding (W1) is connected with the collector electrode of switch triode (T), and the base stage of switch triode (T) is inputted a pulse voltage, the grounded emitter of switch triode (T);
The secondary winding comprises the first power supply winding (W2)～the 4th power supply winding (W5), the first demodulation winding (W6) and the second demodulation winding (W7) and modulation winding (W8);
Described the first power supply winding (W2)～the 4th power supply winding (W5) connects respectively rectification circuit;
The syndeton of described the first demodulation winding (W6) is: the different name end of the first demodulation winding (W6) connects the input of level shift circuit, the output of the first level shift circuit (Vout1) is connected with the input demodulator, and the Same Name of Ends of the first demodulation winding (W6) is connected with the earth terminal of described level shift circuit; The different name end of the first demodulation winding (W6) also is connected with the negative pole of the 6th diode (D6), six filtering capacitor (C6) ground connection of the positive pole of the 6th diode (D6) by connecting;
The syndeton of described the second demodulation winding (W7) is: the different name end of the second demodulation winding (W7) connects the input of level shift circuit, the output of second electrical level shift circuit (Vout2) is connected with output demodulator, and the Same Name of Ends of the second demodulation winding (W7) is connected with the earth terminal of described level shift circuit; The different name end of the second demodulation winding (W7) also is connected with the negative pole of the 7th diode (D7), seven filtering capacitor (C7) ground connection of the positive pole of the 7th diode (D7) by connecting;
The syndeton of described modulation winding (W8) is: the Same Name of Ends of modulation winding (W8) is connected with the negative pole of the 8th diode (D8), the positive pole of the 8th diode (D8) connects the output of modulator, and the different name end of modulation winding (W8) is connected with the earth terminal of described modulator.
2. the transformer for isolated amplifier as claimed in claim 1, it is characterized in that: the rectification circuit that described the first power supply winding (W2) and the 4th power supply winding (W5) connect respectively is: the Same Name of Ends of the Same Name of Ends of the first power supply winding (W2) and the 4th power supply winding (W5) is connected with the positive pole of the second diode (D2) and the 5th diode (D5) respectively, the negative pole of the second diode (D2) and the 5th diode (D5) is respectively the power supply output, and described power supply output connects respectively the second filtering capacitor (C2) and the 5th filtering capacitor (C5); The rectification circuit that described the second power supply winding (W3) and the 3rd power supply winding (W4) connect respectively is: the different name end of the different name end of the second power supply winding (W3) and the 3rd power supply winding (W4) is connected with the negative pole of the 3rd diode (D3) and the 4th diode (D4) respectively, the positive pole of the 3rd diode (D3) and the 4th diode (D4) is respectively the power supply output, and described power supply output connects respectively the 3rd filtering capacitor (C3) and the 4th filtering capacitor (C4).
3. the transformer for isolated amplifier as claimed in claim 1, it is characterized in that: the number of turn and the inductance value of described the first demodulation winding (W6) and the second demodulation winding (W7) are identical, and the Same Name of Ends position of the first demodulation winding (W6) and the second demodulation winding (W7) is symmetrical take the axis by toroidal core (1) center as mirror image.
4. the transformer for isolated amplifier as claimed in claim 1, it is characterized in that: described the first power supply winding (W2) lays respectively at the two ends of toroidal core (1) with the 3rd power supply winding (W4) and the second power supply winding (W3) with the 4th power supply winding (W5), and is respectively the Double-wire parallel wound structure.
5. the transformer for isolated amplifier as claimed in claim 1 is characterized in that: the initiating terminal of described each coil windings and clearing end are stranded by the insulation extexine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220462892 CN202816630U (en) | 2012-09-12 | 2012-09-12 | Transformer for isolation amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220462892 CN202816630U (en) | 2012-09-12 | 2012-09-12 | Transformer for isolation amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202816630U true CN202816630U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220462892 Expired - Fee Related CN202816630U (en) | 2012-09-12 | 2012-09-12 | Transformer for isolation amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN202816630U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856063A (en) * | 2012-09-12 | 2013-01-02 | 无锡天和电子有限公司 | Transformer for isolation amplifier |
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2012
- 2012-09-12 CN CN 201220462892 patent/CN202816630U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856063A (en) * | 2012-09-12 | 2013-01-02 | 无锡天和电子有限公司 | Transformer for isolation amplifier |
| CN102856063B (en) * | 2012-09-12 | 2015-09-16 | 无锡天和电子有限公司 | For the transformer of isolated amplifier |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20150912 |
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| EXPY | Termination of patent right or utility model |