CN102307011A - Miniature high voltage isolation VV converter module formed by LM331 - Google Patents
Miniature high voltage isolation VV converter module formed by LM331 Download PDFInfo
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- CN102307011A CN102307011A CN201110278266A CN201110278266A CN102307011A CN 102307011 A CN102307011 A CN 102307011A CN 201110278266 A CN201110278266 A CN 201110278266A CN 201110278266 A CN201110278266 A CN 201110278266A CN 102307011 A CN102307011 A CN 102307011A
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Abstract
The invention relates to a miniature high voltage isolation VV converter module formed by LM331. The module comprises a high voltage isolation converter circuit packaged in a shell. The high voltage isolation converter circuit is welded with a plurality of pins. The high voltage isolation converter circuit comprises a voltage-frequency conversion circuit, an input auxiliary circuit, and a frequency-voltage conversion circuit. The voltage-frequency conversion circuit connects with the frequency-voltage conversion circuit and the input auxiliary circuit respectively. Beneficial effects of the present invention are as follows: complete isolation transmission of analogue data is realized; the module has the characteristics of low power dissipation, small temperature drift, good stability, a small external dimension, light weight and easiness of PCB installation.
Description
Technical field
The present invention relates to a kind of isolation transmission of analogue data, aspects such as isolated controlling of suspension high voltage source of being widely used in, the small high voltage isolated V/V converter module that constitutes by LM331.
Background technology
The converter majority that occurs on the market is single V/F or F/V converter; It is mainly used in remote A/D or D/A conversion; Along with development in science and technology; In the application of high voltage source; Particularly aspect the adjusting control of suspension high pressure, ubiquity that volume is big, control precision is not high, response speed waits problem slowly.
Summary of the invention
In view of the deficiency that prior art exists, the invention provides that a kind of volume is little, reliability and good stability, the output linearity is high, response speed is fast, the small high voltage isolated V/V converter module that constitutes by LM331.
The present invention is for realizing above-mentioned purpose; The technical scheme of being taked is: a kind of small high voltage isolated V/V converter module that is made up of LM331; Comprise the high pressure isolated converter circuit that is encapsulated in the housing; Be welded with several pins that draw on the high pressure isolated converter circuit; It is characterized in that: said high pressure isolated converter circuit comprises voltage-frequency conversion circuit, input auxiliary circuit, voltage to frequency translation circuit, and said voltage-frequency conversion circuit is connected with voltage to frequency translation circuit and input auxiliary circuit respectively;
Earth terminal 3 pin of control chip U5 meet input ground G1 in the said input auxiliary circuit; Electric capacity anode 2 pin of control chip U5 connect the positive pole of capacitor C 12; The negative pole of capacitor C 12 connects electric capacity negative terminal 4 pin of control chip U5; The output 5 pin difference connecting resistance R22 of control chip U5 and an end of capacitor C 14; The other end of resistance R 22 connects the other end of resistance R 5 in negative pole and the voltage-frequency conversion circuit of an end, diode D1 of capacitor C 13 respectively, and the positive pole of diode D1 links to each other with the other end of capacitor C 13 and capacitor C 14 and meets input ground G1;
The invention has the beneficial effects as follows: the isolation fully that realizes analogue data transmits; That low in energy consumption, temperature is floated is little, conversion accuracy is high, good stability; Overall dimension is little, and is in light weight, is easy to PCB and installs.
Description of drawings
Fig. 1 is a sketch map of the present invention.
Fig. 2 is the upward view of Fig. 1.
Fig. 3 is that circuit of the present invention connects block diagram and as Figure of abstract.
Fig. 4 is circuit theory diagrams of the present invention.
Embodiment
Like Fig. 1,2,3, shown in 4; The small high voltage isolated V/V converter module that constitutes by LM331; Comprise the high pressure isolated converter circuit that is encapsulated in the housing 1; Be welded with several pins 2 that draw on the high pressure isolated converter circuit; High pressure isolated converter circuit comprises voltage-frequency conversion circuit, input auxiliary circuit, voltage to frequency translation circuit, and the voltage-frequency conversion circuit is connected with voltage to frequency translation circuit and input auxiliary circuit respectively;
Earth terminal 3 pin of control chip U5 meet input ground G1 in the input auxiliary circuit; Electric capacity anode 2 pin of control chip U5 connect the positive pole of capacitor C 12; The negative pole of capacitor C 12 connects electric capacity negative terminal 4 pin of control chip U5; The output 5 pin difference connecting resistance R22 of control chip U5 and an end of capacitor C 14; The other end of resistance R 22 connects the other end of resistance R 5 in negative pole and the voltage-frequency conversion circuit of an end, diode D1 of capacitor C 13 respectively, and the positive pole of diode D1 links to each other with the other end of capacitor C 13 and capacitor C 14 and meets input ground G1;
Circuit adopts that wide dynamic range, nonlinear distortion are little, wide frequency range, conversion and control chip that the conversion precision is high, makes circuit structure simple, and control is convenient; Increase the input offset circuit, reduce the nonlinear distortion of V/V converter module output; Select the components and parts of low noise, low temperature drift, good stability for use, guarantee long-term reliability and stability; Rational PCB layout, the isolated insulation requirement between guaranteeing to import and export.
High voltage isolated V/V converter module adopts metal shell, and the user can connect input ground or output ground with housing according to actual operating position, and good electromagnetic shielding action can be arranged, and improves the antijamming capability of converter module.
Operation principle
In the voltage-frequency conversion circuit, 5 pin of control chip U1 are the time of internal timing comparator end to be set, and the length of timing depends on the product of resistance R 3 and capacitor C 2; Analog signal is imported from applied signal voltage end Vi; After the input filtering that resistance R 1 and capacitor C 3 are formed; Be added to 7 pin of control chip U1; This pin is the in-phase end of chip internal input comparator; Variation according to above-mentioned inner two comparator input terminal voltages; Make the upset of their periodic control internal triggers, and export the square wave of certain frequency, and then drive photoelectrical coupler U4 at 3 pin of control chip U1.
In addition, be to improve the output transform precision, reduce nonlinear distortion, forms the input offset circuit, and be added to 7 pin of control chip U1, to offset the influence that input is lacked of proper care through resistance R 5 by control chip U5, capacitor C 12 etc.
In the voltage to frequency translation circuit, 5 pin of control chip U2 are the time of internal timing comparator end to be set, and the length of timing depends on the product of resistance R 16 and capacitor C 7; The pulse signal of isolating the certain frequency that sends from photoelectrical coupler U4; Through triode T1 and through the differential circuit of resistance R 12 with capacitor C 6 compositions; After spike that produces and the stack of the dividing potential drop of resistance R 12 and resistance R 13; Be added to threshold value end 6 pin of control chip U2, i.e. the end of oppisite phase of chip internal input comparator.Through each link control of chip internal, at current output terminal 1 pin of control chip U2, promptly obtain the electric charge accumulation on the capacitor C 8, pulse frequency is high more, and the voltage on the capacitor C 8 is high more.The aanalogvoltage that obtains, the follower that constitutes through amplifier U3A again, the pulse signal of the certain frequency that isolation is sent finally reverts back the voltage identical with input analog voltage.
Claims (2)
1. small high voltage isolated V/V converter module that constitutes by LM331; Comprise the high pressure isolated converter circuit that is encapsulated in the housing (1); Be welded with several pins (2) that draw on the high pressure isolated converter circuit; It is characterized in that: said high pressure isolated converter circuit comprises voltage-frequency conversion circuit, input auxiliary circuit, voltage to frequency translation circuit, and said voltage-frequency conversion circuit is connected with voltage to frequency translation circuit and input auxiliary circuit respectively;
Current output terminal 1 pin of control chip U1 links to each other with threshold value end 6 pin in the said voltage-frequency conversion circuit; Resistance R 6 is parallelly connected with capacitor C 4; Current output terminal 1 pin of one termination control chip U1 of resistance R 6; The other end of resistance R 6 meets input ground G1 through resistance R 7; Reference current end 2 pin of control chip U1 link to each other with earth terminal 4 pin of control chip U1 through resistance R 4 and meet input ground G1; The positive pole of capacitor C 1 meets input supply power voltage end+V1 respectively; Supply voltage input 8 pin of control chip U1; One end of anodal 1 pin of the input light-emitting diode of photoelectrical coupler U4 and resistance R 3; The negative pole of capacitor C 1 meets input ground G1; Negative pole 2 pin of the input light-emitting diode of photoelectrical coupler U4 connect frequency output terminal 3 pin of control chip U1 through resistance R 8; The internal timing comparator time of control chip U1 is provided with end 5 pin and connects an end of capacitor C 2 and the other end of resistance R 3 respectively; Comparator input terminal 7 pin of control chip U1 are connecting resistance R1 respectively; One end of resistance R 5 and capacitor C 3; The other end of resistance R 1 is an end and the applied signal voltage end Vi of connecting resistance R2 respectively, and the other end of resistance R 2 links to each other with the other end of capacitor C 2 and capacitor C 3 and meets input ground G1;
Earth terminal 3 pin of control chip U5 meet input ground G1 in the said input auxiliary circuit; Electric capacity anode 2 pin of control chip U5 connect the positive pole of capacitor C 12; The negative pole of capacitor C 12 connects electric capacity negative terminal 4 pin of control chip U5; The output 5 pin difference connecting resistance R22 of control chip U5 and an end of capacitor C 14; The other end of resistance R 22 connects the other end of resistance R 5 in negative pole and the voltage-frequency conversion circuit of an end, diode D1 of capacitor C 13 respectively, and the positive pole of diode D1 links to each other with the other end of capacitor C 13 and capacitor C 14 and meets input ground G1;
Frequency output terminal 3 pin of control chip U2 link to each other with earth terminal 4 pin and meet output ground G2 in the said voltage to frequency translation circuit; The positive pole of capacitor C 11 connects an end, resistance R 14 and resistance R 16 and the end of resistance R 20 of output triode colelctor electrode 4 pin, resistance R 11 and resistance R 12 of supply voltage input 8 pin, the photoelectrical coupler U4 of output supply voltage end+V2, control chip U2 respectively; The negative pole of capacitor C 11 meets output ground G2; The other end of resistance R 20 connects an end of capacitor C 10 and supply voltage input 8 pin of amplifier U3A respectively; Another termination output ground G2 of capacitor C 10; Reference current end 2 pin of control chip U2 meet output signal voltage adjustable side Wj by resistance R 17; Resistance R 18 is in parallel with capacitor C 8; The current output terminal 1 pin difference connecting resistance R18 of control chip U2 and an end of resistance R 19; The other end of resistance R 19 connects in-phase input end 3 pin of amplifier U3A and an end of capacitor C 9 respectively; The other end of the other end of resistance R 18 and capacitor C 9 connects and connects exports ground G2; Output 1 pin of amplifier U3A links to each other with inverting input 2 pin and an end and the output signal voltage end Vo of connecting resistance R21; The other end of resistance R 21 links to each other with earth terminal 4 pin of amplifier U3A and meets output ground G2; The internal timing comparator time of control chip U2 is provided with end 5 pin and connects an end of capacitor C 7 and the other end of resistance R 16 respectively; The end of the comparator input terminal 7 pin difference connecting resistance R15 of control chip U2 and the other end of resistance R 14; Threshold value end 6 pin of control chip U2 are an end, an end of capacitor C 6 and the other end of resistance R 12 of connecting resistance R13 respectively; The other end of capacitor C 7 links to each other with the other end of resistance R 13 and resistance R 15 and meets output ground G2; The other end of the other end difference connecting resistance R11 of capacitor C 6 and the colelctor electrode of triode T1; Resistance R 10 is in parallel with capacitor C 5; The base stage of one termination triode T1 of resistance R 10; The other end of resistance R 10 connects output triode emitter stage 3 pin of photoelectrical coupler U4 and an end of resistance R 9 respectively, and the other end of resistance R 9 links to each other with the emitter stage of triode T1 and meets output ground G2.
2. a kind of small high voltage isolated V/V converter module that constitutes by LM331 according to claim 1; It is characterized in that: said several pins (2) that draw are exposed to outside the housing (1); One side is three and draws pin (2); By input supply power voltage end+V1, applied signal voltage end Vi, input ground G1 sequence arrangement; Opposite side is four and draws pin (2), by output supply power voltage end+V2, output signal voltage end Vo, output signal voltage adjustable side Wj, output ground G2 sequence arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110278266A CN102307011A (en) | 2011-09-19 | 2011-09-19 | Miniature high voltage isolation VV converter module formed by LM331 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110278266A CN102307011A (en) | 2011-09-19 | 2011-09-19 | Miniature high voltage isolation VV converter module formed by LM331 |
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| CN102307011A true CN102307011A (en) | 2012-01-04 |
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| CN201110278266A Pending CN102307011A (en) | 2011-09-19 | 2011-09-19 | Miniature high voltage isolation VV converter module formed by LM331 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130392A (en) * | 2016-08-25 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of high frequency and high voltage power supply circuit of frequency, amplitude, power adjustable joint |
| CN106130326A (en) * | 2016-07-22 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
| CN106160422A (en) * | 2016-08-28 | 2016-11-23 | 东文高压电源（天津）股份有限公司 | A kind of isolation 100KV high accuracy V/V translation circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789686A (en) * | 2010-03-16 | 2010-07-28 | 天津市东文高压电源厂 | Small high voltage isolated V/V converter module |
-
2011
- 2011-09-19 CN CN201110278266A patent/CN102307011A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789686A (en) * | 2010-03-16 | 2010-07-28 | 天津市东文高压电源厂 | Small high voltage isolated V/V converter module |
Non-Patent Citations (1)
| Title |
|---|
| 张瑞昌: "一种实用的电压隔离电路", 《现代电力》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130326A (en) * | 2016-07-22 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
| CN106130326B (en) * | 2016-07-22 | 2018-08-28 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
| CN106130392A (en) * | 2016-08-25 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of high frequency and high voltage power supply circuit of frequency, amplitude, power adjustable joint |
| CN106130392B (en) * | 2016-08-25 | 2018-06-19 | 东文高压电源（天津）股份有限公司 | A kind of frequency, amplitude, power adjustable section high frequency and high voltage power supply circuit |
| CN106160422A (en) * | 2016-08-28 | 2016-11-23 | 东文高压电源（天津）股份有限公司 | A kind of isolation 100KV high accuracy V/V translation circuit |
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Application publication date: 20120104 |