CN106291065B - Voltage sampling circuit - Google Patents
Voltage sampling circuit Download PDFInfo
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- CN106291065B CN106291065B CN201610903021.3A CN201610903021A CN106291065B CN 106291065 B CN106291065 B CN 106291065B CN 201610903021 A CN201610903021 A CN 201610903021A CN 106291065 B CN106291065 B CN 106291065B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- Amplifiers (AREA)
- Measurement Of Current Or Voltage (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The invention relates to the field of power supplies, in particular to a voltage sampling circuit. The voltage sampling circuit for the voltage module of the voltage analyzer provided by the invention is characterized in that a positive end power supply input end, a load end, a negative end power supply input end and a load end are respectively sampled, differential operational amplification is carried out to obtain a first sampling signal, the first sampling signal and a reference power supply Vref are respectively transmitted to a second operational amplifier circuit through a first matching resistor and a second matching resistor to obtain an accurate second sampling signal, and the second sampling signal is amplified according to a designated proportion and then transmitted to a power module controller module to be used as reference data for the power conversion circuit and waveform generation by the controller. The voltage sampling by adopting the circuit is more accurate and the circuit work is more stable.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a voltage sampling circuit.
Background
Typically, in performing dc power related tests, engineers must pool and configure multiple instruments to accomplish dc power and measurement tasks. When performing these complex tasks, multiple test instruments may be connected simultaneously, increasing the risk of error; for this reason, engineers may choose to automatically test far more complex than manual testing, but automated testing tasks, while reducing human error, further add to the effort of writing and debugging programs to research and development engineers that have already been overloaded with work. The appearance of the DC power supply analyzer avoids the use of multiple devices by engineers and complicated debugging before testing. The power analyzer can measure the current flowing into the DUT through its built-in current dynamic measurement capability without the need for such sensors as current probes and shunts; the direct current power supply analyzer does not need to develop control and measurement programs, all functions and measurement are integrated in the same equipment, and a PC, a driver and software are not needed, which is equivalent to reducing the workload related to setting by more than 90%; the user can complete the direct current power supply and measurement test task only in 2 days by using the independent test equipment, and can complete the test in 5 minutes by using the direct current power supply analyzer. In general, a universal meter module, an oscilloscope module, an arbitrary waveform generation module, a data recording module and a plurality of direct current power supply modules are integrated in the direct current power supply analyzer, wherein the plurality of direct current power supply modules with different output powers are certainly one of the most core devices of the power supply analyzer, a voltage sampling circuit in the direct current power supply module is responsible for input and output sampling, provides an important function of data basis for waveform generation of a power supply control module, is an important functional module for generating a controllable waveform by the power supply module, and the sampling precision and the stability of the circuit module directly relate to whether the whole power supply module has higher controllable precision.
Disclosure of Invention
The invention aims to provide a power module voltage sampling circuit with high sampling precision and stable circuit operation aiming at the requirement of each power module in a direct current power analyzer on controllable precision.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a voltage sampling circuit comprises a positive end sampling circuit, a negative end sampling circuit, a differential operational amplifier circuit, a first matching resistor, a second operational amplifier circuit and a proportional amplifying circuit;
the positive end sampling circuit comprises a first near end sampling circuit for sampling from the input end of the power supply module and a first far end sampling circuit for sampling from the load end, and the first near end sampling circuit and the first far end sampling circuit respectively input sampling signals to the inverting input end of the differential operational amplifier circuit;
the negative end sampling circuit comprises a second near-end sampling circuit and a second far-end sampling circuit, wherein the second near-end sampling circuit is used for sampling from the input end of the power supply module, and the second near-end sampling circuit and the second far-end sampling circuit are used for respectively inputting sampling signals to the positive-phase input end of the differential operational amplifier circuit;
the output end of the differential operational amplifier circuit is connected with one input end of the second operational amplifier circuit through a first matching resistor; the other input end of the second operational amplifier circuit receives a reference voltage Vref through a second matching resistor;
the output end of the second operational amplifier circuit outputs a sampling voltage signal through a proportional amplifying circuit.
Further, the positive end sampling circuit further comprises a first filter circuit; the negative end sampling circuit further comprises a second filter circuit;
the first filter circuit is arranged among the first near-end sampling circuit, the first far-end sampling circuit and the differential operational amplifier circuit;
the second filter circuit is arranged among the second near-end sampling circuit, the second far-end sampling circuit and the differential operational amplifier circuit.
Further, the first near-end sampling circuit is connected with the inverting input end of the differential operational amplifier circuit through a first resistor, a third resistor and a fifth resistor which are sequentially connected in series; the first resistor and the third resistor which are connected in series are connected with the first capacitor in parallel; the first remote sampling circuit is connected with the connecting ends of the first resistor and the third resistor;
the second near-end sampling circuit is connected with the non-inverting input end of the differential operational amplifier circuit through a second resistor, a fourth resistor and a sixth resistor which are sequentially connected in series; the second resistor and the fourth resistor which are connected in series are connected with the second capacitor in parallel; one end of the sixth resistor, which is connected with the differential operational amplifier circuit, is grounded through a ninth resistor and a third capacitor which are connected in parallel; the second remote sampling circuit is connected with the connecting ends of the second resistor and the fourth resistor;
the inverting input end of the differential operational amplifier circuit is also connected with the output end of the differential operational amplifier circuit through a fourth capacitor and a tenth resistor which are connected in parallel.
Further, the first matching resistor and the second matching resistor are the same.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the voltage sampling circuit for the voltage module of the voltage analyzer provided by the invention is characterized in that a positive end power supply input end, a load end, a negative end power supply input end and a load end are respectively sampled, differential operational amplification is carried out to obtain a first sampling signal, the first sampling signal and a reference power supply Vref are respectively transmitted to a second operational amplifier circuit through a first matching resistor and a second matching resistor to obtain an accurate second sampling signal, and the second sampling signal is amplified according to a designated proportion and then transmitted to a power module controller module to be used as reference data for the power conversion circuit and waveform generation by the controller. The voltage sampling by adopting the circuit is more accurate and the circuit work is more stable.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a diagram of a distal and proximal sampling circuit for the positive and negative terminals of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1: as shown in fig. 1, a voltage sampling circuit includes a positive end sampling circuit, a negative end sampling circuit, a differential operational amplifier circuit U1, a first matching resistor 41, a second matching resistor 42, a second operational amplifier circuit 5 and a proportional amplifying circuit 6;
the positive sampling circuit comprises a first near-end sampling circuit 21 for sampling from the input end of the power supply module and a first far-end sampling circuit 22 for sampling from the load end, and the first near-end sampling circuit 21 and the first far-end sampling circuit 22 respectively input sampling signals to the inverting input end of the differential operational amplifier circuit U1;
the negative end sampling circuit comprises a second near-end sampling circuit 31 for sampling from the input end of the power supply module and a second far-end sampling circuit 32 for sampling from the load end, and the second near-end sampling circuit 31 and the second far-end sampling circuit 32 respectively input sampling signals to the positive phase input end of the differential operational amplifier circuit U1;
the output end of the differential operational amplifier circuit 1 is connected with one input end of the second operational amplifier circuit 5 through a first matching resistor 41 (R11 in FIG. 2); the other input end of the second operational amplifier circuit 5 receives a reference voltage Vref through a second matching resistor 42;
the output end of the second operational amplifier circuit 5 outputs a sampling voltage signal through a proportional amplifying circuit 6.
Specifically, the positive side sampling circuit further includes a first filter circuit 23; the negative side sampling circuit further comprises a second filter circuit 33;
the first filter circuit 23 is arranged among the first near-end sampling circuit 21, the first far-end sampling circuit 22 and the differential operational amplifier circuit U1;
the second filter circuit 33 is disposed between the second near-end sampling circuit 31, the second far-end sampling circuit 32, and the differential operational amplifier circuit U1.
In this embodiment, as shown in fig. 2, the first near-end sampling circuit 21 is connected to the inverting input terminal of the differential operational amplifier circuit U1 through a first resistor R1, a third resistor R3, and a fifth resistor R5 that are sequentially connected in series; the first resistor R1 and the third resistor R3 which are connected in series are connected in parallel with the first capacitor C1; the first far-end sampling circuit 22 is connected with the connecting ends of the first resistor R1 and the third resistor R3;
the second near-end sampling circuit 31 is connected with the non-inverting input end of the differential operational amplifier circuit U1 through a second resistor R2, a fourth resistor R4 and a sixth resistor R6 which are sequentially connected in series; the second resistor R2 and the fourth resistor R4 which are connected in series are connected in parallel with the second capacitor C2; one end of the sixth resistor R6 connected with the differential operational amplifier circuit U1 is grounded through a ninth resistor R9 and a third capacitor C3 which are connected in parallel; the second distal sampling circuit 32 is connected with the connection ends of the second resistor R2 and the fourth resistor R4;
the inverting input end of the differential operational amplifier circuit U1 is also connected with the output end of the differential operational amplifier circuit U1 through a fourth capacitor C4 and a tenth resistor R10 which are connected in parallel.
The first matching resistor R11 and the second matching resistor 42 must be identical to ensure the accuracy of sampling. The reference voltage Vref represents a control target, which is typically generated by a controller.
The voltage sampling circuit for the voltage module of the voltage analyzer provided by the invention is characterized in that a positive end power supply input end, a load end, a negative end power supply input end and a load end are respectively sampled, differential operational amplification is carried out to obtain a first sampling signal, the first sampling signal and a reference power supply Vref are respectively transmitted to a second operational amplifier circuit through a first matching resistor and a second matching resistor to obtain an accurate second sampling signal, and the second sampling signal is amplified according to a designated proportion and then transmitted to a power module controller module to be used as reference data for the power conversion circuit and waveform generation by the controller. The voltage sampling by adopting the circuit is more accurate and the circuit work is more stable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. The voltage sampling circuit is characterized by comprising a positive end sampling circuit, a negative end sampling circuit, a differential operational amplifier circuit, a first matching resistor, a second operational amplifier circuit and a proportional amplifying circuit;
the positive end sampling circuit comprises a first near end sampling circuit for sampling from the input end of the power supply module and a first far end sampling circuit for sampling from the load end, and the first near end sampling circuit and the first far end sampling circuit respectively input sampling signals to the inverting input end of the differential operational amplifier circuit;
the negative end sampling circuit comprises a second near-end sampling circuit and a second far-end sampling circuit, wherein the second near-end sampling circuit is used for sampling from the input end of the power supply module, and the second near-end sampling circuit and the second far-end sampling circuit are used for respectively inputting sampling signals to the positive-phase input end of the differential operational amplifier circuit;
the output end of the differential operational amplifier circuit is connected with one input end of the second operational amplifier circuit through a first matching resistor; the other input end of the second operational amplifier circuit receives a reference voltage Vref through a second matching resistor;
the output end of the second operational amplifier circuit outputs a sampling voltage signal through a proportional amplifying circuit;
the first near-end sampling circuit is connected with the inverting input end of the differential operational amplifier circuit through a first resistor, a third resistor and a fifth resistor which are sequentially connected in series; the first resistor and the third resistor which are connected in series are connected with the first capacitor in parallel; the first remote sampling circuit is connected with the connecting ends of the first resistor and the third resistor;
the second near-end sampling circuit is connected with the non-inverting input end of the differential operational amplifier circuit through a second resistor, a fourth resistor and a sixth resistor which are sequentially connected in series; the second resistor and the fourth resistor which are connected in series are connected with the second capacitor in parallel; one end of the sixth resistor, which is connected with the differential operational amplifier circuit, is grounded through a ninth resistor and a third capacitor which are connected in parallel; the second remote sampling circuit is connected with the connecting ends of the second resistor and the fourth resistor;
the inverting input end of the differential operational amplifier circuit is also connected with the output end of the differential operational amplifier circuit through a fourth capacitor and a tenth resistor which are connected in parallel.
2. The voltage sampling circuit of claim 1, wherein the positive side sampling circuit further comprises a first filter circuit; the negative end sampling circuit further comprises a second filter circuit;
the first filter circuit is arranged among the first near-end sampling circuit, the first far-end sampling circuit and the differential operational amplifier circuit;
the second filter circuit is arranged among the second near-end sampling circuit, the second far-end sampling circuit and the differential operational amplifier circuit.
3. The voltage sampling circuit of claim 1, wherein the first matching resistance and the second matching resistance are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903021.3A CN106291065B (en) | 2016-10-17 | 2016-10-17 | Voltage sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903021.3A CN106291065B (en) | 2016-10-17 | 2016-10-17 | Voltage sampling circuit |
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| CN106291065A CN106291065A (en) | 2017-01-04 |
| CN106291065B true CN106291065B (en) | 2023-05-16 |
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| CN109884552A (en) * | 2019-03-20 | 2019-06-14 | 浪潮商用机器有限公司 | Power supply test method and system |
| CN113703387A (en) * | 2021-08-24 | 2021-11-26 | 无锡江南计算技术研究所 | Dual output voltage sampling circuit switching system of treater power |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206074674U (en) * | 2016-10-17 | 2017-04-05 | 成都前锋电子仪器有限责任公司 | A kind of voltage sample circuit |
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| JP4162416B2 (en) * | 2002-03-12 | 2008-10-08 | 新電元工業株式会社 | High power factor power supply control circuit and power supply having this control circuit |
| CN101762734B (en) * | 2008-12-23 | 2012-09-19 | 台达电子工业股份有限公司 | Output voltage detection circuit and switching power supply |
| CN101629975B (en) * | 2009-04-27 | 2011-05-11 | 成都天奥测控技术有限公司 | Relay contact-voltage measuring and conditioning circuit and measuring method |
| CN201667616U (en) * | 2010-03-29 | 2010-12-08 | 比亚迪股份有限公司 | Multiple power supply load circuit |
| CN201877808U (en) * | 2010-09-13 | 2011-06-22 | 惠州市蓝微电子有限公司 | Battery cell protective circuit of multi-power lithium battery |
| JP2013104820A (en) * | 2011-11-15 | 2013-05-30 | Canon Electronics Inc | Power consumption measurement device and power consumption measurement system |
| CN102841258B (en) * | 2012-09-12 | 2015-05-20 | 北京东方计量测试研究所 | Measuring device and method for direct current supply output impedance |
| CN204595180U (en) * | 2013-09-05 | 2015-08-26 | 上海龙创节能系统股份有限公司 | A kind of supervising device being applied to high-power DC power supply system |
| CN203672952U (en) * | 2014-01-24 | 2014-06-25 | 镇江天力变压器有限公司 | Bus voltage detection circuit of high-frequency dedusting power supply |
| CN203849325U (en) * | 2014-06-06 | 2014-09-24 | 厦门科华恒盛股份有限公司 | Alternating-current and direct-current voltage isolation differential sampling circuit |
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| CN206074674U (en) * | 2016-10-17 | 2017-04-05 | 成都前锋电子仪器有限责任公司 | A kind of voltage sample circuit |
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