CN107171566A - A kind of transformer coupled isolated amplifier of parallel connection chopping type - Google Patents
A kind of transformer coupled isolated amplifier of parallel connection chopping type Download PDFInfo
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- CN107171566A CN107171566A CN201710419546.4A CN201710419546A CN107171566A CN 107171566 A CN107171566 A CN 107171566A CN 201710419546 A CN201710419546 A CN 201710419546A CN 107171566 A CN107171566 A CN 107171566A
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- Prior art keywords
- parallel connection
- circuit
- transformer
- connection chopping
- copped wave
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of transformer coupled isolated amplifier of parallel connection chopping type, including the parallel connection chopping modulation circuit, isolating transformer and parallel connection chopping demodulator circuit being sequentially connected, a differential modulation chopper circuit that difference structure is constituted with the parallel connection chopping modulation circuit is in series with the earth terminal of the copped wave pipe of the parallel connection chopping modulation circuit；A differential demodulation chopper circuit that difference structure is constituted with the parallel connection chopping demodulator circuit is in series with the earth terminal of the copped wave pipe of the parallel connection chopping demodulator circuit, the rear class of the parallel connection chopping demodulator circuit is connected with differential amplifier circuit.Compared with existing transformer isolation amplifier, with lower temperature drift, higher transmission bandwidth, in addition, its efficiency and signal to noise ratio are about doubled.
Description
Technical field
The present invention relates to isolating transformer field, and in particular to a kind of transformer for parallel connection chopping modulation demodulation system
AC/DC universal isolated amplifier.
Background technology
Transformer coupled isolated amplifier is made up of two parts, power transformer and signal isolation transformer.Power supply transformation
Device also provides required chopping modulation demodulated signal to control N or P ditches in addition to the power supply needed for providing isolated amplifier
Road fet switch, completes modulation and demodulation.The main function of signal isolation transformer is to transmit the signal after chopping modulation,
Play coupling and buffer action.
The schematic diagram of existing transformer coupled isolated amplifier is as shown in figure 1, the side that power supply/square wave oscillator is produced
Ripple, after transformer coupled, controls the break-make of the JFET copped wave pipes of chopping modulation/demodulation, completion is cut to input signal respectively
Ripple modulating/demodulating.
Existing signal isolation transformer completes modulation and demodulation using parallel connection chopping circuit mostly, as shown in Figure 2.But
It is that, using the copped wave of which, there is both sides unfavorable factor, influence the index of chopping modulation/demodulation.
First, by taking N-channel FET as an example, during by depth pinch off, the gate-drain electric current I of FET switch pipeGDO.FET switch pipe
Equivalent to reverse-biased PN junction diode between grid and raceway groove, so, even if having sufficiently large minus gate voltage depth pinch off, grid-
Reverse-biased leakage current is still had between leakage and gate-source.Gate-drain electric current IGDOIn copped wave/demodulation load RLThe voltage drop of upper generation
Equal to IGDORL.Work as RLWhen being worth sufficiently large, this value is probably than larger.IGDOAlso it is similar to temperature and exponential relationship is presented, is to draw
Play the main cause of chopper temperature drift.
Second, transition spike.N-channel FET switch pipe is all existed than larger gate groove junction capacity, its numerical value 5~
Between 25p.When Chopper driving square-wave signal is added on grid, wink is presented in output end in the charge and discharge effect of these electric capacity
Become spike.In fact, the chopper for being not added with compensation, is considerable, it is observed that up to tens of millivolts are to hundreds of
The transition spike of millivolt.Although this very narrow spike energy is less, when it mainly enters the AC amplifier being followed by
Overload saturation state.In order to suppress transition spike, as shown in Figure 2, it is common practice to increase RC absorbing circuits, but increase this electricity
Road, for the amplifier connect later, that is, drift current is generated, while can also bring circuit response time
Increase, the deterioration of amplitude versus frequency characte is unfavorable for testing AC signal.
The content of the invention
In order to solve the above-mentioned technical problem the present invention provides a kind of transformer coupled isolated amplifier of parallel connection chopping type.
The present invention is achieved through the following technical solutions：
A kind of transformer coupled isolated amplifier of parallel connection chopping type, including be sequentially connected parallel connection chopping modulation circuit, every
From transformer and parallel connection chopping demodulator circuit, be in series with the earth terminal of the copped wave pipe of the parallel connection chopping modulation circuit one with
The parallel connection chopping modulation circuit constitutes the differential modulation chopper circuit of difference structure；The copped wave pipe of the parallel connection chopping demodulator circuit
Earth terminal on be in series with the differential demodulation chopper circuit that one and the parallel connection chopping demodulator circuit constitute difference structure, it is described simultaneously
The rear class of connection copped wave demodulator circuit is connected with differential amplifier circuit.
Inventor has found in the research to chopper circuit, to solve caused by above-mentioned chopper temperature drift and transition spike
The problem of quality of output signals is poor after copped wave, most effective way suppresses above-mentioned influence using difference structure.Using the knot
After structure, transition spike is common mode, into after follow-up isolated amplifier, will be effectively suppressed, it is not necessary to RC absorption mesh
Network, shortens the response time, amplitude versus frequency characte also can significantly improve, with higher transmission bandwidth.
The circuit of this programme, due to being differential configuration, the control end of two copped wave pipes of modulated terminal is while suspension control signal
Control, the control end suspension control signal control simultaneously of two copped wave pipes of demodulating end, two control signal synchronizations, whole control week
There is external signal to enter differential amplifier circuit in phase, its efficiency and signal to noise ratio are doubled.
The parallel connection chopping modulation circuit includes being connected between input signal end and isolating transformer first input end
First resistor, the first copped wave pipe being connected between isolating transformer first input end and ground terminal, the differential modulation copped wave electricity
Road includes being connected to the second copped wave pipe between ground terminal and the input of isolating transformer second, to be connected to isolating transformer second defeated
Enter the second resistance between end and ground terminal, the resistance of the first resistor and second resistance is equal.
The parallel connection chopping demodulator circuit includes the 3rd electricity being connected between load and the output end of isolating transformer first
The 3rd copped wave pipe hinder, being connected between the output end of isolating transformer first and ground terminal, the differential demodulation chopper circuit includes
Be connected to the 4th copped wave pipe between ground terminal and the output end of isolating transformer second, be connected to the output end of isolating transformer second with
The resistance of the 4th resistance between load, the 3rd resistor and the 4th resistance is equal.
The isolating transformer is for the AC amplifier with differential input or with centre tapped coupling transformer.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention connects differential tune respectively on the basis of existing parallel connection chopping modulation circuit, parallel connection chopping demodulator circuit
Chopper circuit processed, differential demodulation chopper circuit, make modulation circuit and demodulator circuit constitute differential configuration to suppress temperature drift band
The influence come；Using the structure, because transition spike is common mode, into after follow-up isolated amplifier, will effectively it be pressed down
System is fallen, it is not necessary to RC uptake pathways, shortens the response time, amplitude versus frequency characte also can significantly improve, with higher transmission bandwidth.
2nd, using the transformer coupled isolated amplifier of this programme, whole drive cycle has external signal to enter amplification
Device, has signal to pass through, its efficiency and signal to noise ratio improve one compared to only having the half period in existing circuit structure each cycle
Times.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of existing transformer coupled isolated amplifier.
Fig. 2 is the circuit theory diagrams that existing transformer coupled isolated amplifier uses parallel connection chopping.
Fig. 3 is the circuit theory diagrams of this programme.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment
A kind of transformer coupled isolated amplifier of parallel connection chopping type as shown in Figure 3, including the parallel connection chopping being sequentially connected
Modulation circuit, isolating transformer, parallel connection chopping demodulator circuit and differential amplifier circuit, the copped wave of the parallel connection chopping modulation circuit
A differential modulation chopper circuit that difference structure is constituted with the parallel connection chopping modulation circuit is in series with the earth terminal of pipe；It is described
One is in series with the earth terminal of the copped wave pipe of parallel connection chopping demodulator circuit and constitutes difference structure with the parallel connection chopping demodulator circuit
Differential demodulation chopper circuit.
Specifically, parallel connection chopping modulation circuit, parallel connection chopping demodulator circuit use structure as shown in Figure 3.Parallel connection chopping
Modulation circuit, which includes being connected to first resistor between input signal end and isolating transformer first input end, be connected to isolation becomes
The first copped wave pipe between depressor first input end and ground terminal, then constituting the differential modulation chopper circuit of differential configuration therewith includes
Be connected to the second copped wave pipe between ground terminal and the input of isolating transformer second, be connected to the input of isolating transformer second with
Second resistance between ground terminal, the resistance of the first resistor and second resistance is equal.First copped wave pipe and the second copped wave pipe are adopted
Managed with same model or double FET, its IGDOWith same or analogous temperature coefficient.Parallel connection chopping demodulator circuit includes connection
3rd resistor between load and the output end of isolating transformer first, be connected to the output end of isolating transformer first and ground terminal it
Between the 3rd copped wave pipe, then therewith constitute differential configuration differential demodulation chopper circuit include be connected to ground terminal and isolating transformer
The 4th copped wave pipe between second output end, the 4th resistance being connected between the output end of isolating transformer second and load, institute
The resistance for stating 3rd resistor and the 4th resistance is equal, and the 3rd copped wave pipe and the 4th copped wave pipe are managed using same model or double FET,
Its IGDOWith same or analogous temperature coefficient.
First copped wave pipe, poor the second copped wave pipe, the 3rd copped wave pipe and the 4th copped wave pipe use same model or double FET
Pipe, its IGDOWith same or analogous temperature coefficient；Differential amplifier circuit uses difference AC amplifier, utilizes difference AC
The common mode inhibition capacity of amplifier, you can reach compensation both sides IGDOPurpose.Isolating transformer uses the friendship with differential input
Stream amplifier or with centre tapped coupling transformer, IGDOInfluence can be suppressed completely.
As shown in figure 3, two copped wave pipes of modulated terminal control end and demodulating end two copped wave pipes control end two
Individual control signal is synchronous, has external signal to enter differential amplifier circuit in whole controlling cycle, is cut compared to existing parallel connection
Wave structure, its efficiency and signal to noise ratio are doubled.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (4)
1. a kind of transformer coupled isolated amplifier of parallel connection chopping type, including be sequentially connected parallel connection chopping modulation circuit, isolation
Transformer, parallel connection chopping demodulator circuit, it is characterised in that：Connected on the earth terminal of the copped wave pipe of the parallel connection chopping modulation circuit
There is a differential modulation chopper circuit that difference structure is constituted with the parallel connection chopping modulation circuit；The parallel connection chopping demodulator circuit
Copped wave pipe earth terminal on be in series with the differential demodulation copped wave electricity that one and the parallel connection chopping demodulator circuit constitute difference structure
Road, the rear class of the parallel connection chopping demodulator circuit is connected with differential amplifier circuit.
2. a kind of transformer coupled isolated amplifier of parallel connection chopping type according to claim 1, it is characterised in that it is described simultaneously
First resistor that connection chopping modulation circuit includes being connected between input signal end and isolating transformer first input end, it is connected to
The first copped wave pipe between isolating transformer first input end and ground terminal, the differential modulation chopper circuit includes being connected to ground terminal
The second copped wave pipe between the input of isolating transformer second, it is connected between the input of isolating transformer second and ground terminal
Second resistance, the resistance of the first resistor and second resistance is equal.
3. a kind of transformer coupled isolated amplifier of parallel connection chopping type according to claim 1, it is characterised in that it is described simultaneously
3rd resistor that connection copped wave demodulator circuit includes being connected between load and the output end of isolating transformer first, it is connected to isolation and becomes
The 3rd copped wave pipe between the output end of depressor first and ground terminal, the differential demodulation chopper circuit includes being connected to ground terminal and isolation
The 4th copped wave pipe between the output end of transformer second, the 4th electricity being connected between the output end of isolating transformer second and load
The resistance of resistance, the 3rd resistor and the 4th resistance is equal.
4. a kind of transformer coupled isolated amplifier of parallel connection chopping type according to claim 1, it is characterised in that it is described every
From transformer for the AC amplifier with differential input or with centre tapped coupling transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710419546.4A CN107171566A (en) | 2017-06-06 | 2017-06-06 | A kind of transformer coupled isolated amplifier of parallel connection chopping type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710419546.4A CN107171566A (en) | 2017-06-06 | 2017-06-06 | A kind of transformer coupled isolated amplifier of parallel connection chopping type |
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| CN107171566A true CN107171566A (en) | 2017-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710419546.4A Pending CN107171566A (en) | 2017-06-06 | 2017-06-06 | A kind of transformer coupled isolated amplifier of parallel connection chopping type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118713656A (en) * | 2024-09-02 | 2024-09-27 | 深圳平创半导体有限公司 | Signal processing circuit based on transformer isolation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103441A (en) * | 1985-04-02 | 1986-10-01 | 山东大学 | Chopper in the high-sensitive DC amplifier |
| CN101867365A (en) * | 2010-04-28 | 2010-10-20 | 广州金升阳科技有限公司 | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation |
| CN101964549A (en) * | 2010-09-08 | 2011-02-02 | 中国科学院电工研究所 | Converter for superconducting magnetic energy storage magnet to output energy |
| CN102025281A (en) * | 2009-09-15 | 2011-04-20 | 南京理工大学 | Cuk-converter-based high-frequency isolated three-level alternating current (AC)-AC converter |
| CN102291019A (en) * | 2011-07-22 | 2011-12-21 | 上海交通大学 | Full-bridge rectification-direct-current push-pull inversion AC-DC (alternating current-to-direct current) converter |
| US20130257507A1 (en) * | 2012-04-03 | 2013-10-03 | Texas Instruments Incorporated | Analog Multiplier and Method for Current Shunt Power Measurements |
| CN104487198A (en) * | 2012-07-23 | 2015-04-01 | 伊利诺斯工具制品有限公司 | Method and apparatus for providing welding type power |
-
2017
- 2017-06-06 CN CN201710419546.4A patent/CN107171566A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103441A (en) * | 1985-04-02 | 1986-10-01 | 山东大学 | Chopper in the high-sensitive DC amplifier |
| CN102025281A (en) * | 2009-09-15 | 2011-04-20 | 南京理工大学 | Cuk-converter-based high-frequency isolated three-level alternating current (AC)-AC converter |
| CN101867365A (en) * | 2010-04-28 | 2010-10-20 | 广州金升阳科技有限公司 | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation |
| CN101964549A (en) * | 2010-09-08 | 2011-02-02 | 中国科学院电工研究所 | Converter for superconducting magnetic energy storage magnet to output energy |
| CN102291019A (en) * | 2011-07-22 | 2011-12-21 | 上海交通大学 | Full-bridge rectification-direct-current push-pull inversion AC-DC (alternating current-to-direct current) converter |
| US20130257507A1 (en) * | 2012-04-03 | 2013-10-03 | Texas Instruments Incorporated | Analog Multiplier and Method for Current Shunt Power Measurements |
| CN104487198A (en) * | 2012-07-23 | 2015-04-01 | 伊利诺斯工具制品有限公司 | Method and apparatus for providing welding type power |
Non-Patent Citations (1)
| Title |
|---|
| 韦建英: "《模拟电子技术》", 31 August 2010, 华中科技大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118713656A (en) * | 2024-09-02 | 2024-09-27 | 深圳平创半导体有限公司 | Signal processing circuit based on transformer isolation |
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Application publication date: 20170915 |
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