CN203761361U - Level shift circuit - Google Patents
Level shift circuit Download PDFInfo
- Publication number
- CN203761361U CN203761361U CN201320883782.9U CN201320883782U CN203761361U CN 203761361 U CN203761361 U CN 203761361U CN 201320883782 U CN201320883782 U CN 201320883782U CN 203761361 U CN203761361 U CN 203761361U
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- China
- Prior art keywords
- diode
- resistance
- resistor
- level shift
- shift circuit
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- Withdrawn - After Issue
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Abstract
The utility model discloses a level shift circuit, and two input ends are connected with two ends of a demodulator winding. The negative electrode of a first diode is connected with one input end, and the positive electrode of the first diode is in series connection with a first capacitor, and then is connected with the other input end. A first resistor and a second resistor are connected in series, and then are in parallel connection with the first capacitor. A second capacitor is connected between the negative electrode of the first diode and the positive electrode of a second diode. A third resistor is connected between the positive electrode of the first diode and the positive electrode of the second diode. A fourth resistor, a fifth resistor and a sixth resistor are connected in series between the negative electrode of the second diode and the positive electrode of the first diode. The common end of the fourth and fifth resistors is connected in series with a seventh resistor, so as to serve as an output end. The common end of the second resistor and the first capacitor serves as the other output end. A third capacitor is connected in parallel with the first resistor, the second resistor, a fifth resistor, and a sixth resistor. The fourth capacitor is connected between the two output ends. The circuit provided by the utility model can enable a demodulating circuit to output a positive level, a zero level or a negative level, and meets the transmission requirements of an isolation amplifier for a positive level signal, a zero level signal or a negative level signal.
Description
Technical field
The utility model relates to electrical type instrument, instrument, particularly a kind of level shift circuit that is applicable to isolated amplifier demodulator circuit.
Background technology
Adopt the isolated amplifier of crest voltage modulation because its modulation system is different from traditional modulation, and want to transmit AC signal, direct current signal.Therefore the demodulator circuit of such isolated amplifier and traditional demodulation (detection) circuit are also different.General demodulation (detection) circuit adopts diode to add the small-signal detecting circuit of electric capacity, without level shift function, cannot meet the use of such isolated amplifier demodulator circuit.
Utility model content
For the problems referred to above, the utility model provides a kind of level shift circuit, can make demodulator circuit output positive level, zero level, negative level, meets the transmission requirement of isolated amplifier to positive voltage, no-voltage, negative voltage signal.
The technical solution of the utility model is as follows:
A kind of level shift circuit, comprises two inputs, and described two inputs are connected with the two ends of demodulator winding respectively; The negative pole of the first diode is connected with an input of level shift circuit, after anodal series connection the first electric capacity, is connected with another input of level shift circuit; The first resistance and the second resistance are connected afterwards and the first Capacitance parallel connection; One end of the second electric capacity is connected with the negative pole of the first diode, and the other end is connected with the positive pole of the second diode; After positive pole series connection the 3rd resistance of the second diode, is connected with the positive pole of the first diode, the negative pole of the second diode is connected after the 4th resistance, the 5th resistance, the 6th resistance and is connected with the positive pole of the first diode; After common port series connection the 7th resistance of the 4th resistance and the 5th resistance, as an output of level shift circuit, the common port of the second resistance and the first electric capacity is as another output of level shift circuit; The 3rd electric capacity and the first resistance, the second resistance, the 5th resistance, the 6th resistance are in parallel; The 4th electric capacity is connected between two outputs of level shift circuit.
Useful technique effect of the present utility model is:
The utility model, according to the requirement of signal modulation system in isolated amplifier and signal transmission level, has increased level shift circuit on the basis of demodulation (detection) output, and demodulation is exported to become-15V of zero level output level.In the time that demodulator crest voltage is greater than 15V, level shift circuit output positive level; In the time that demodulator crest voltage equals 15V, level shift circuit output zero level; In the time that demodulator crest voltage is less than 15V, level shift circuit output positive level, has realized level shift function.
The utility model can make demodulator circuit output positive level, zero level, negative level, meets the transmission requirement of isolated amplifier to positive voltage, no-voltage, negative voltage signal.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the concrete line map of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, two inputs of level shift circuit are connected with the two ends of demodulator winding W6 respectively schematic diagram of the present utility model.The negative pole of diode D1 is connected with an input of level shift circuit, after the anodal series capacitance C1 of diode D1, is connected with another input of level shift circuit.In parallel with capacitor C 1 after resistance R 1, R2 series connection.One end of capacitor C 2 is connected with the negative pole of diode D1, and the other end is connected with the positive pole of diode D2.After the cathode series resistance R3 of diode D2, be connected with the positive pole of diode D1, after the negative pole series resistance R4 of diode D2, R5, R6, be connected with the positive pole of diode D1.After the common port series resistance R7 of resistance R 4 and R5, as an output of level shift circuit, the common port of resistance R 2 and capacitor C 1 is as another output of level shift circuit.Capacitor C 3 and resistance R 1, R2, R5, R6 are in parallel; Capacitor C 4 is connected between two outputs of level shift circuit.
In the time that the polarity of demodulator winding W6 is lower just upper bearing, diode D1 conducting, by resistance R 2, R1, capacitor C 1, makes A point current potential be-15V.When the polarity of demodulator winding W6 is upper when just lower negative, diode D2 conducting, electric current is set up voltage U B through capacitor C 2, diode D2, resistance R 4, R5, R6 at B point, and because A point voltage is-15V, the B point current potential 15V that declined, realizes level shift function.
The concrete line map of an embodiment of the utility model as shown in Figure 2.Diode D1, resistance R 1, R2, capacitor C 1 form detecting circuit, foundation-15V voltage, and discharging current is I=15/R1.Capacitor C 2, resistance R 3, R4, R5, R6, diode D2 form level shift circuit, actual level shift circuit output UC=UB-15.The utility model is tested use in my company's T H3656 isolated amplifier demodulator circuit, proves effective.
Above-described is only preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate under the prerequisite that does not depart from spirit of the present utility model and design, within all should thinking and being included in protection range of the present utility model.
Claims (1)
1. a level shift circuit, is characterized in that: comprise two inputs, described two inputs are connected with the two ends of demodulator winding respectively; The negative pole of the first diode (D1) is connected with an input of level shift circuit, after anodal series connection the first electric capacity (C1), is connected with another input of level shift circuit; In parallel with the first electric capacity (C1) after the first resistance (R1) and the second resistance (R2) series connection; One end of the second electric capacity (C2) is connected with the negative pole of the first diode (D1), and the other end is connected with the positive pole of the second diode (D2); Positive pole series connection the 3rd resistance (R3) of the second diode (D2) is connected with the positive pole of the first diode (D1) afterwards, and negative pole series connection the 4th resistance (R4) of the second diode (D2), the 5th resistance (R5), the 6th resistance (R6) are connected with the positive pole of the first diode (D1) afterwards; After common port series connection the 7th resistance (R7) of the 4th resistance (R4) and the 5th resistance (R5), as an output of level shift circuit, the common port of the second resistance (R2) and the first electric capacity (C1) is as another output of level shift circuit; The 3rd electric capacity (C3) and the first resistance (R1), the second resistance (R2), the 5th resistance (R5), the 6th resistance (R6) are in parallel; The 4th electric capacity (C4) is connected between two outputs of level shift circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320883782.9U CN203761361U (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320883782.9U CN203761361U (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761361U true CN203761361U (en) | 2014-08-06 |
Family
ID=51256591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320883782.9U Withdrawn - After Issue CN203761361U (en) | 2013-12-30 | 2013-12-30 | Level shift circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203761361U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701455A (en) * | 2013-12-30 | 2014-04-02 | 无锡天和电子有限公司 | Level shifting circuit |
-
2013
- 2013-12-30 CN CN201320883782.9U patent/CN203761361U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701455A (en) * | 2013-12-30 | 2014-04-02 | 无锡天和电子有限公司 | Level shifting circuit |
| CN103701455B (en) * | 2013-12-30 | 2016-08-17 | 无锡天和电子有限公司 | Level shift circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20160817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |