CN103701455B - Level shift circuit - Google Patents
Level shift circuit Download PDFInfo
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- CN103701455B CN103701455B CN201310743567.3A CN201310743567A CN103701455B CN 103701455 B CN103701455 B CN 103701455B CN 201310743567 A CN201310743567 A CN 201310743567A CN 103701455 B CN103701455 B CN 103701455B
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- level shift
- shift circuit
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Abstract
The open a kind of level shift circuit of the present invention, two inputs are connected with the two ends of demodulator winding；The negative pole of the first diode connects an input, and positive pole is connected and connected another input after the first electric capacity；First electric capacity in parallel after first, second resistant series；The second electric capacity is connected between negative pole and the positive pole of the second diode of the first diode；The 3rd resistance is connected, the 4th to the 6th resistance of connecting between negative pole and the positive pole of the first diode of the second diode between the positive pole of the first diode and the second diode；Common port series connection the 7th resistance of the 4th resistance and the 5th resistance is as an outfan, and the common port of the second resistance and the first electric capacity is as another outfan；3rd electric capacity and first, second, the five, the 6th resistor coupled in parallel；4th electric capacity is connected between two outfans.The present invention can make demodulator circuit export positive level, zero level, negative level, meets isolated amplifier to positive voltage, no-voltage, the transmission requirement of negative voltage signal.
Description
Technical field
The present invention relates to electrical type instrument, instrument, a kind of isolated amplifier demodulator circuit that is applicable to
Level shift circuit.
Background technology
The isolated amplifier of employing crest voltage modulation is different from traditional modulation due to its modulation system, and
And want to transmit AC signal, direct current signal.Therefore the demodulator circuit of such isolated amplifier and traditional solution
Adjust (detection) circuit the most different.The little letter that general demodulation (detection) circuit uses diode to add electric capacity
Number detecting circuit, without level shift function, it is impossible to meet the use of such isolated amplifier demodulator circuit.
Summary of the invention
For the problems referred to above, the present invention provides a kind of level shift circuit, and demodulator circuit can be made to export positive electricity
Flat, zero level, negative level, meet isolated amplifier to positive voltage, no-voltage, the transmission of negative voltage signal
Requirement.
Technical scheme is as follows:
A kind of level shift circuit, including two inputs, said two input respectively with demodulator winding
Two ends connect；The negative pole of the first diode is connected with level shift circuit input, and positive pole is connected
After first electric capacity, another input with level shift circuit is connected；After first resistance and the second resistant series
In parallel with the first electric capacity；One end of second electric capacity is connected with the negative pole of the first diode, the other end and the two or two
The positive pole of pole pipe connects；It is connected with the positive pole of the first diode after positive pole series connection the 3rd resistance of the second diode,
With the positive pole of the first diode after negative pole series connection the 4th resistance, the 5th resistance, the 6th resistance of the second diode
Connect；As one of level shift circuit after common port series connection the 7th resistance of the 4th resistance and the 5th resistance
Outfan, the common port of the second resistance and the first electric capacity is as another outfan of level shift circuit；The
Three electric capacity and the first resistance, the second resistance, the 5th resistance, the 6th resistor coupled in parallel；4th electric capacity is connected to electricity
Between two outfans of translational shifting circuit.
The method have the benefit that:
The present invention is according to signal modulation system in isolated amplifier and the requirement of transmission signal level, in demodulation
Add level shift circuit on the basis of (detection) output, demodulation output zero level output is become-15V
Level.When demodulator crest voltage is more than 15V, level shift circuit output positive level；When demodulator peak
When threshold voltage is equal to 15V, level shift circuit output zero level；When demodulator crest voltage is less than 15V
Time, level shift circuit output negative level, it is achieved that level shift function.
The present invention can make demodulator circuit export positive level, zero level, negative level, meets isolated amplifier pair
Positive voltage, no-voltage, the transmission requirement of negative voltage signal.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the present invention.
Fig. 2 is the concrete layout of an embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further.
The schematic diagram of the present invention as it is shown in figure 1, level shift circuit two inputs respectively with demodulator around
The two ends of group W6 connect.The negative pole of diode D1 is connected with level shift circuit input, and two
After positive pole series capacitance C1 of pole pipe D1, another input with level shift circuit is connected.Resistance R1,
R2 is in parallel with electric capacity C1 after connecting.One end of electric capacity C2 is connected with the negative pole of diode D1, the other end
It is connected with the positive pole of diode D2.After the cathode series resistance R3 of diode D2 with diode D1 just
Pole connects, and after negative pole series resistance R4 of diode D2, R5, R6, the positive pole with diode D1 is connected.
As an outfan of level shift circuit, resistance after common port series resistance R7 of resistance R4 and R5
The common port of R2 and electric capacity C1 is as another outfan of level shift circuit.Electric capacity C3 and resistance R1,
R2, R5, R6 are in parallel；Electric capacity C4 is connected between two outfans of level shift circuit.
When the polarity of demodulator winding W6 be lower just upper negative time, diode D1 turns on, by resistance R2,
R1, electric capacity C1, making A point current potential is-15V.When the polarity of demodulator winding W6 be upper just lower negative time,
Diode D2 turns on, and electric current is set up at B point through electric capacity C2, diode D2, resistance R4, R5, R6
Voltage UB, owing to A point voltage is-15V, then B point current potential have dropped 15V, it is achieved level shift function.
The concrete layout of one embodiment of the invention is as shown in Figure 2.Diode D1, resistance R1, R2,
Electric capacity C1 constitutes detecting circuit, sets up-15V voltage, and discharge current is I=15/R1.Electric capacity C2, resistance
R3, R4, R5, R6, diode D2 constitute level shift circuit, and actual level shift circuit exports
UC=UB-15.The present invention tests use in my company's T H3656 isolated amplifier demodulator circuit, it was demonstrated that
Effective.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above example.Permissible
Understanding, those skilled in the art the most directly derive or associate
The oher improvements and changes arrived, within being all considered as being included in protection scope of the present invention.
Claims (1)
1. a level shift circuit, it is characterised in that: include two inputs, said two input
Two ends with demodulator winding are connected respectively；The negative pole of the first diode (D1) and the one of level shift circuit
Individual input connects, and positive pole connects the first electric capacity (C1) afterwards with another input of level shift circuit even
Connect；First resistance (R1) and the second resistance (R2) are in parallel with the first electric capacity (C1) after connecting；Second
One end of electric capacity (C2) is connected with the negative pole of the first diode (D1), the other end and the second diode (D2)
Positive pole connect；Second diode (D2) positive pole series connection the 3rd resistance (R3) afterwards with the first diode
(D1) positive pole connects, negative pole series connection the 4th resistance (R4), the 5th resistance of the second diode (D2)
(R5), the 6th resistance (R6) positive pole with the first diode (D1) afterwards is connected；4th resistance (R4)
Connect after the 7th resistance (R7) as level shift circuit with the common port of the 5th resistance (R5)
Outfan, another as level shift circuit of the common port of the second resistance (R2) and the first electric capacity (C1)
One outfan；3rd electric capacity (C3) and the first resistance (R1), the second resistance (R2), the 5th resistance
(R5), the 6th resistance (R6) is in parallel；4th electric capacity (C4) be connected to level shift circuit two are defeated
Go out between end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743567.3A CN103701455B (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743567.3A CN103701455B (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103701455A CN103701455A (en) | 2014-04-02 |
| CN103701455B true CN103701455B (en) | 2016-08-17 |
Family
ID=50362877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310743567.3A Active CN103701455B (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103701455B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5852367A (en) * | 1992-09-01 | 1998-12-22 | International Business Machines Corporation | Speed enhanced level shifting circuit utilizing diode capacitance |
| CN102856063A (en) * | 2012-09-12 | 2013-01-02 | 无锡天和电子有限公司 | Transformer for isolation amplifier |
| CN203225711U (en) * | 2013-04-16 | 2013-10-02 | 无锡天和电子有限公司 | Isolation amplifier |
| CN103475356A (en) * | 2013-09-16 | 2013-12-25 | 四川航天***工程研究所 | Low-level wake-up signal generating circuit capable of being used for UWB positioning tags |
| CN203761361U (en) * | 2013-12-30 | 2014-08-06 | 无锡天和电子有限公司 | Level shift circuit |
-
2013
- 2013-12-30 CN CN201310743567.3A patent/CN103701455B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5852367A (en) * | 1992-09-01 | 1998-12-22 | International Business Machines Corporation | Speed enhanced level shifting circuit utilizing diode capacitance |
| CN102856063A (en) * | 2012-09-12 | 2013-01-02 | 无锡天和电子有限公司 | Transformer for isolation amplifier |
| CN203225711U (en) * | 2013-04-16 | 2013-10-02 | 无锡天和电子有限公司 | Isolation amplifier |
| CN103475356A (en) * | 2013-09-16 | 2013-12-25 | 四川航天***工程研究所 | Low-level wake-up signal generating circuit capable of being used for UWB positioning tags |
| CN203761361U (en) * | 2013-12-30 | 2014-08-06 | 无锡天和电子有限公司 | Level shift circuit |
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| Publication number | Publication date |
|---|---|
| CN103701455A (en) | 2014-04-02 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Level shift circuit Effective date of registration: 20210318 Granted publication date: 20160817 Pledgee: China Merchants Bank Limited by Share Ltd. Wuxi branch Pledgor: WUXI TIANHE ELECTRONIC Co.,Ltd. Registration number: Y2021320010098 |
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