CN210037958U - Voltage isolation sampling circuit - Google Patents
Voltage isolation sampling circuit Download PDFInfo
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- CN210037958U CN210037958U CN201920167679.1U CN201920167679U CN210037958U CN 210037958 U CN210037958 U CN 210037958U CN 201920167679 U CN201920167679 U CN 201920167679U CN 210037958 U CN210037958 U CN 210037958U
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- operational amplifier
- isolation
- resistor
- power supply
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- 238000002955 isolation Methods 0.000 title claims abstract description 50
- 238000005070 sampling Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000036581 peripheral resistance Effects 0.000 abstract 1
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model discloses a voltage isolation sampling circuit, it is including keeping apart operational amplifier and operational amplifier, direct current input signal carries out the partial pressure through the resistance network that first resistance and second resistance are constituteed, turn into the high voltage of sampling and keep apart the identifiable safe voltage of operational amplifier, this signal is through resistance, the electric capacity filters after again keeps apart operational amplifier, amplify the output with the sampling signal, after the differential amplifier 1:1 of operational amplifier and peripheral resistance constitution is enlarged, turn into single-ended signal with the differential signal of keeping apart the operational amplifier output and carry out AD collection with signal supply rear end AD chip after RC filter circuit conversion again. The utility model is suitable for a various isolation voltage sampling's occasion also is fit for the occasion of isolation current sampling.
Description
Technical Field
The utility model belongs to the technical field of the power technique and specifically relates to a voltage isolation sampling circuit is related to.
Background
At present, voltage isolation sampling often plays a very important role in electronic power systems. The following schemes are mainly used for voltage sampling in the conventional isolation system: firstly, a voltage signal to be isolated is directly converted into a required small signal through a Hall voltage acquisition chip, the acquisition precision is high, but the cost of a Hall device is high; secondly, a linear optocoupler is selected, the acquisition precision is high, but the linear optocoupler is expensive in price, an auxiliary circuit recommends dual power supplies, and the scheme is high in cost; there is also a common isolation operational amplifier scheme, for example, the AMC1200 isolation operational amplifier is selected, but the output signal of the scheme is a differential signal, the back end is usually connected with the differential operational amplifier, and it is also recommended to select a dual power supply, and the cost is relatively high.
Disclosure of Invention
In order to solve the above problem, the utility model aims at providing a sampling circuit is kept apart to voltage that precision is high, linear good, the security is high.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a voltage isolation sampling circuit comprises an isolation operational amplifier and an operational amplifier, wherein a positive input end of a power supply voltage is connected with one end of a first resistor, the other end of the first resistor is connected with the positive input end of the isolation operational amplifier through a third resistor, and is connected with the negative input end of the power supply voltage through a first capacitor and a second resistor which are connected in parallel, the negative input end of the power supply voltage is connected with the negative input end of the isolation operational amplifier through a fourth resistor, the first power end, the positive input end and the negative input end of the isolation operational amplifier are respectively connected with a fourth capacitor, a fifth capacitor and a second capacitor, the third capacitor is connected between the positive input end and the negative input end, the first power end and the second power end are respectively connected with a first power supply and a second power supply, and the positive output end and the negative output end are respectively connected with the second ground end through a ninth capacitor and a sixth capacitor and are connected with the power ground; the positive output end of the isolation operational amplifier is connected with the non-inverting input end of the operational amplifier through a sixth resistor, the negative output end of the isolation operational amplifier is connected with the inverting input end of the operational amplifier through a fifth resistor, a seventh capacitor is connected between the positive output end and the negative output end, the second power supply end is connected with the negative power supply end of the operational amplifier through an eighth capacitor, the positive power supply end and the negative power supply end of the operational amplifier are respectively connected with a second power supply source and a power ground, an eighth resistor is connected between the inverting input end and the output end, the non-inverting input end and the positive power supply end are respectively connected with the second grounding end of the isolation operational amplifier through the seventh resistor and the tenth capacitor, the output end is connected with one end of a ninth resistor, the other end of the ninth resistor.
The voltage isolation sampling circuit has an isolation operational amplifier with model of AMC1200 and an operational amplifier with model of LPV 521.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the voltage isolation sampling circuit is reasonable in structural design, low in manufacturing cost, convenient to use, safe and reliable, adopts single power supply to supply power, realizes linear collection of isolation voltage through the isolation operational amplifier AMC1200 and the operational amplifier TLV521, is stable in output, is suitable for various isolation voltage sampling occasions, and is also suitable for isolation current sampling occasions.
Drawings
Fig. 1 is a schematic diagram of the voltage isolation sampling circuit of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the voltage isolation sampling circuit includes an isolation operational amplifier N1 and an operational amplifier N2, a power supply voltage positive input terminal (VC +) is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to a positive input terminal (VINP) of an isolation operational amplifier N1 through a third resistor R3, and is further connected to a power supply voltage negative input terminal (VC-) through a first capacitor C1 and a second resistor R2 connected in parallel, the power supply voltage negative input terminal (VC-) is connected to a negative input terminal (VINN) of the isolation operational amplifier N1 through a fourth resistor R4, and is further connected to a first ground terminal (GND1) and is grounded, and the first power supply terminal (VDD1), the positive input terminal (VINP), the negative input terminal (VINN) and the first ground terminal (GND1) of the isolation operational amplifier N1 are respectively connected to a fourth capacitor C4, a fifth capacitor C5, a second capacitor C42, and a positive input terminal (np) and a second capacitor C2, A third capacitor C3 is connected between the negative input ends (VINN), the first power supply end (VDD1) is connected with a first power supply (+5V1), the second power supply end (VDD2) is connected with a second power supply (+5V), and the positive output end (VOUP) and the negative output end (VOUN) are respectively connected with a second grounding end (GND2) through a ninth capacitor C9 and a sixth capacitor C6 and connected with the power ground; the positive output end (VOUP) of an isolation operational amplifier N1 is connected with the non-inverting input end of an operational amplifier N2 through a sixth resistor R6, the negative output end (VOUN) is connected with the inverting input end of an operational amplifier N2 through a fifth resistor R5, a seventh capacitor C7 is connected between the positive output end and the negative output end, a second power supply end (VDD2) is connected with the negative power supply end of an operational amplifier N2 through an eighth capacitor C8, the positive power supply end of the operational amplifier N2 is connected with a second power supply (+5V), the negative power supply end is connected with a power supply Ground (GNDA), an eighth resistor R8 is connected between the inverting input end and the output end, the non-inverting input end and the positive power supply end are respectively connected with a second grounding end (GND2) of the isolation operational amplifier N1 through a seventh resistor R7 and a tenth capacitor C10, the output end of the operational amplifier N2 is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is, the other end of the eleventh capacitor C11 is connected to the power ground.
The isolation operational amplifier N1 model is AMC1200, which is a fully differential isolation amplifier; operational amplifier N2, model LPV521, is a nano-power operational amplifier.
The utility model discloses voltage isolation sampling circuit's theory of operation does: the DC input signal is divided by a resistor network consisting of a first resistor R1 and a second resistor R2, the sampled high voltage is converted into a safe voltage (a sampling signal for short) which can be identified by an isolation operational amplifier N1, the sampling signal is filtered by a third resistor R3, a fourth resistor R4, a second capacitor C2, a third capacitor C3 and a fifth capacitor C5 and then isolated by an isolation operational amplifier N1, the isolation voltage is up to 4250V, and the sampling signal is amplified and output according to the amplification effect of multiplication gain of 8; after being amplified by a differential amplifier 1:1 consisting of AN operational amplifier N2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and AN eighth resistor R8, differential signals output by a positive output end (VOUP) and a negative output end (VOUN) of AN isolation operational amplifier N1 are converted into single-ended signals, the single-ended signals are converted into AN signals after passing through AN RC filter circuit consisting of a ninth resistor R9 and AN eleventh capacitor C11, and the AN signals are supplied to a rear-end AD chip for AD acquisition.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A voltage isolation sampling circuit is characterized in that: it comprises an isolation operational amplifier and an operational amplifier, wherein the positive input end of the power supply voltage is connected with one end of a first resistor, the other end of the first resistor is connected with the positive input end of the isolation operational amplifier through a third resistor, and is connected with the negative input end of the power supply voltage through a first capacitor and a second resistor which are connected in parallel, the negative input end of the power supply voltage is connected with the negative input end of the isolation operational amplifier through a fourth resistor, the first power end, the positive input end and the negative input end of the isolation operational amplifier are respectively connected with a fourth capacitor, a fifth capacitor and a second capacitor, the third capacitor is connected between the positive input end and the negative input end, the first power end and the second power end are respectively connected with a first power supply and a second power supply, and the positive output end and the negative output end are respectively connected with the second ground end through a ninth capacitor and a sixth capacitor and are connected with the power ground; the positive output end of the isolation operational amplifier is connected with the non-inverting input end of the operational amplifier through a sixth resistor, the negative output end of the isolation operational amplifier is connected with the inverting input end of the operational amplifier through a fifth resistor, a seventh capacitor is connected between the positive output end and the negative output end, the second power supply end is connected with the negative power supply end of the operational amplifier through an eighth capacitor, the positive power supply end and the negative power supply end of the operational amplifier are respectively connected with a second power supply source and a power ground, an eighth resistor is connected between the inverting input end and the output end, the non-inverting input end and the positive power supply end are respectively connected with the second grounding end of the isolation operational amplifier through the seventh resistor and the tenth capacitor, the output end is connected with one end of a ninth resistor, the other end of the ninth resistor.
2. The voltage isolation sampling circuit of claim 1, wherein: the model of the isolation operational amplifier is AMC1200, and the model of the operational amplifier is LPV 521.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920167679.1U CN210037958U (en) | 2019-01-31 | 2019-01-31 | Voltage isolation sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920167679.1U CN210037958U (en) | 2019-01-31 | 2019-01-31 | Voltage isolation sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210037958U true CN210037958U (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920167679.1U Expired - Fee Related CN210037958U (en) | 2019-01-31 | 2019-01-31 | Voltage isolation sampling circuit |
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| Country | Link |
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| CN (1) | CN210037958U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130025A (en) * | 2020-08-21 | 2020-12-25 | 中国电力科学研究院有限公司 | Differential-to-single-ended sampling device for platform area topology identification |
| CN113466732A (en) * | 2021-06-28 | 2021-10-01 | 广西电网有限责任公司贵港供电局 | Battery measuring circuit and battery measuring instrument |
| CN115390612A (en) * | 2022-09-20 | 2022-11-25 | 洛阳隆盛科技有限责任公司 | Far-end voltage regulating circuit of DC-DC converter |
-
2019
- 2019-01-31 CN CN201920167679.1U patent/CN210037958U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130025A (en) * | 2020-08-21 | 2020-12-25 | 中国电力科学研究院有限公司 | Differential-to-single-ended sampling device for platform area topology identification |
| CN113466732A (en) * | 2021-06-28 | 2021-10-01 | 广西电网有限责任公司贵港供电局 | Battery measuring circuit and battery measuring instrument |
| CN115390612A (en) * | 2022-09-20 | 2022-11-25 | 洛阳隆盛科技有限责任公司 | Far-end voltage regulating circuit of DC-DC converter |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200207 |