CN103149417A - Circuit measuring module and method for measuring voltage difference of power source device - Google Patents
Circuit measuring module and method for measuring voltage difference of power source device Download PDFInfo
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- CN103149417A CN103149417A CN2013100342019A CN201310034201A CN103149417A CN 103149417 A CN103149417 A CN 103149417A CN 2013100342019 A CN2013100342019 A CN 2013100342019A CN 201310034201 A CN201310034201 A CN 201310034201A CN 103149417 A CN103149417 A CN 103149417A
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Abstract
The invention discloses a circuit measuring module and a method for measuring voltage difference of a power source device. The circuit measuring module comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and an operational amplifier. An output end of output voltage Vo of the power source device to be measured is connected with an in-phase input end of the operational amplifier through the second resistor. A first connecting end of the first resistor is connected with a common end of the second resistor and the operational amplifier. A second connecting end of the first resistor is earthed. A first connecting end of the third resistor is an input end of input voltage Vr of the device. A second connecting end of the third resistor is connected with an inverted input end of the operational amplifier. The fourth resistor is connected between a common end of the third resistor and the operational amplifier and an output end of error amplifying voltage Vm of the operational amplifier. The circuit measuring module and the method for measuring the voltage difference of the power source device are capable of overcoming the defects of low measuring accuracy, high cost and the like in the prior art so as to achieve the advantages of high measuring accuracy and low cost.
Description
Technical field
The present invention relates to power supply apparatus voltage difference field of measuring technique, particularly, relate to the measuring method of a kind of metering circuit module and power supply apparatus voltage difference.
Background technology
The test parameter of power supply apparatus commonly used mainly contains following several: input voltage range, output reference voltage, voltage regulation factor, load regulation, adjust end or ground end electric current, the Ripple Suppression ratio, output limit electric current, output short circuit current, output impedance, the trigger voltage scope, noise, and transient parameter etc.Wherein, voltage regulation factor and load regulation are the important indicators that determines the power supply apparatus performance.Namely when input side voltage changed to the maximal value of regulation from the minimum that allows output, the relative changing value of output voltage accounted for the number percent of rated voltage to voltage regulation factor.Voltage regulation factor characterizes the important indicator of voltage stabilizer voltage regulation performance quality, and due to the characteristic of power supply apparatus: free voltage in allowed band is got in input, its output is all a fixed value.
So available [(output voltage 1-output voltage 2)/rated output voltage] * 100% calculates, and generally is no more than 0.1%.Load regulation is namely constant when input voltage, when load changes to ratings from zero, and the variation of output voltage.Can cause the variation of power supply output due to the variation of power source loads, load increases, and output reduces, and opposite load reduces, and output raises.
Available [output voltage during when semi-load (full load output voltage-output voltage)/nominal load] * 100% calculates, usually index 3%～5%.Because the definite of voltage regulation factor and load regulation is mainly that voltage difference is done calculating, as long as so record the voltage of output terminal, compare with its rated output voltage again, obtain the voltage difference of its actual output voltage and rated output voltage, can obtain two kinds of measurement parameters.
Traditional measuring method is directly to measure with surveying instruments such as multimeters.Because the error of power supply apparatus is less, the voltage difference of its actual output voltage and rated voltage is usually at several millivolts even less, so for multimeter, its precision is measured small electric pressure reduction not; In addition, if use high-precision surveying instrument, although can more accurately measure, cost will increase greatly.
In realizing process of the present invention, the inventor finds to exist at least in prior art measuring accuracy to hang down and the high in cost of production defective.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of metering circuit module, to realize measuring accuracy height and the low advantage of cost.
The second purpose of the present invention is, proposes a kind of measuring method of the power supply apparatus voltage difference based on above-mentioned metering circuit module.
For achieving the above object, the technical solution used in the present invention is: a kind of metering circuit module, comprise the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and operational amplifier, wherein:
The output voltage V o output terminal of power supply apparatus to be measured is connected with the in-phase input end of operational amplifier after the second resistance R 2; The first link of the first resistance R 1 and the second resistance R 2 are connected common port and are connected with operational amplifier, the second link ground connection GND of the first resistance R 1; The first link of the 3rd resistance R 3 is equipment input voltage Vr input end, and the second link of the 3rd resistance R 3 is connected with the inverting input of operational amplifier; The 4th resistance R 4 is connected to the common port of the 3rd resistance R 3 and operational amplifier and the error of operational amplifier is amplified between voltage Vm output terminal.
Simultaneously, another technical scheme of the present invention's employing is: a kind of measuring method of power supply apparatus voltage difference comprises:
(1) based on described metering circuit module, the output voltage V o of power supply apparatus to be measured as the operational amplifier input end, is made the ratings of the output voltage V o of equipment input voltage Vr=power supply apparatus to be measured;
(2) measure the calculating voltage difference, according to difference channel principle Vm=(R4/R3) * (Vo-Vr), the slight error of the output voltage V o of power supply apparatus to be measured is amplified, and its enlargement factor is mainly determined by the resistance of the 3rd resistance R 3 and the 4th resistance R 4;
Utilize the empty short resolution of amplifier, obtain:
R1×Vo/(R1+R2)＝R4×Vr/(R3+R4)+R3×Vm/(R3+R4)；
By the above derivation of equation, obtain:
Vo×R1×(R3+R4)/(R1+R2)＝R4×Vr+R3×Vm；
Vm＝Vo×R1×(R3+R4)/R3×(R1+R2)-Vm×R4/R3；
According to the actual value of the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, calculate, just can access error and amplify voltage Vm.
The metering circuit module of various embodiments of the present invention and the measuring method of power supply apparatus voltage difference, due to by building differential amplifier circuit at output terminal, with small voltage difference expanded range to tens millivolt and more than, and then adopting the common survey instrument can reach the effect of accurately measuring; Thereby can overcome in prior art the low and high defective of cost of measuring accuracy, to realize the high and low advantage of cost of measuring accuracy.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, perhaps understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of instructions, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the electrical principle schematic diagram of metering circuit module of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
Module embodiment
According to the embodiment of the present invention, provide a kind of metering circuit module.As shown in Figure 1, the metering circuit module of the present embodiment comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and operational amplifier, wherein:
The output voltage V o output terminal of power supply apparatus to be measured is connected with the in-phase input end of operational amplifier after the second resistance R 2; The first link of the first resistance R 1 and the second resistance R 2 are connected common port and are connected with operational amplifier, the second link ground connection GND of the first resistance R 1; The first link of the 3rd resistance R 3 is equipment input voltage Vr input end, and the second link of the 3rd resistance R 3 is connected with the inverting input of operational amplifier; The 4th resistance R 4 is connected to the common port of the 3rd resistance R 3 and operational amplifier and the error of operational amplifier is amplified between voltage Vm output terminal.
Embodiment of the method
According to the embodiment of the present invention, a kind of measuring method of the power supply apparatus voltage difference based on above-mentioned metering circuit module is provided, comprising:
(1) based on described metering circuit module, the output voltage V o of power supply apparatus to be measured as the operational amplifier input end, is made the ratings of the output voltage V o of equipment input voltage Vr=power supply apparatus to be measured;
(2) measure the calculating voltage difference, according to difference channel principle Vm=(R4/R3) * (Vo-Vr), the slight error of the output voltage V o of power supply apparatus to be measured is amplified, and its enlargement factor is mainly determined by the resistance of the 3rd resistance R 3 and the 4th resistance R 4;
Utilize the empty short resolution of amplifier, obtain:
R1×Vo/(R1+R2)＝R4×Vr/(R3+R4)+R3×Vm/(R3+R4)；
By the above derivation of equation, obtain:
Vo×R1×(R3+R4)/(R1+R2)＝R4×Vr+R3×Vm；
Vm＝Vo×R1×(R3+R4)/R3×(R1+R2)-Vm×R4/R3；
According to the actual value of the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, calculate, just can access error and amplify voltage Vm.
For example, can establish RI=40K, R2=100K, R3=5K, R4=800K, the above formula of value substitution of R1, R2, R3 and R4 is calculated, can obtain:
Vm＝46Vo-160Vr
Because Vr is the equipment input voltage, if make the 160Vr=Vo ratings:
Vm＝(46-1)Vo，
The Vm value for error amount the error after being exaggerated 45 times amplify voltage, this error is amplified voltage can be by the common survey apparatus measures.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment, the present invention is had been described in detail, for a person skilled in the art, it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. a metering circuit module, is characterized in that, comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and operational amplifier, wherein:
The output voltage V o output terminal of power supply apparatus to be measured is connected with the in-phase input end of operational amplifier after the second resistance R 2; The first link of the first resistance R 1 and the second resistance R 2 are connected common port and are connected with operational amplifier, the second link ground connection GND of the first resistance R 1; The first link of the 3rd resistance R 3 is equipment input voltage Vr input end, and the second link of the 3rd resistance R 3 is connected with the inverting input of operational amplifier; The 4th resistance R 4 is connected to the common port of the 3rd resistance R 3 and operational amplifier and the error of operational amplifier is amplified between voltage Vm output terminal.
2. the measuring method based on the power supply apparatus voltage difference of metering circuit module claimed in claim 1, is characterized in that, comprising:
(1) based on described metering circuit module, the output voltage V o of power supply apparatus to be measured as the operational amplifier input end, is made the ratings of the output voltage V o of equipment input voltage Vr=power supply apparatus to be measured;
(2) measure the calculating voltage difference, according to difference channel principle Vm=(R4/R3) * (Vo-Vr), the slight error of the output voltage V o of power supply apparatus to be measured is amplified, and its enlargement factor is mainly determined by the resistance of the 3rd resistance R 3 and the 4th resistance R 4;
Utilize the empty short resolution of amplifier, obtain:
R1×Vo/(R1+R2)＝R4×Vr/(R3+R4)+R3×Vm/(R3+R4)；
By the above derivation of equation, obtain:
Vo×R1×(R3+R4)/(R1+R2)＝R4×Vr+R3×Vm；
Vm＝Vo×R1×(R3+R4)/R3×(R1+R2)-Vm×R4/R3；
According to the actual value of the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, calculate, just can access error and amplify voltage Vm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154136A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A kind of detection tool of operational amplifier integrated circuit |
| CN109581029A (en) * | 2018-12-05 | 2019-04-05 | 郑州云海信息技术有限公司 | A kind of system for detecting multi input end current balance type |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201083789Y (en) * | 2007-09-14 | 2008-07-09 | 厦门科华恒盛股份有限公司 | Device for detecting DC far-conveyed power line on current unbalancing |
| CN201654110U (en) * | 2010-04-30 | 2010-11-24 | 浙江天煌科技实业有限公司 | Device for measuring relative voltage |
| US20110156811A1 (en) * | 2009-12-24 | 2011-06-30 | Denso Corporation | Voltage detection device |
| CN201955383U (en) * | 2011-02-17 | 2011-08-31 | 甘肃电力科学研究院 | Measuring device for directly measuring voltage difference between two high-voltage ends |
| CN102288919A (en) * | 2011-05-11 | 2011-12-21 | 张兴发 | Voltage measuring system and method for battery |
| CN203084063U (en) * | 2013-01-30 | 2013-07-24 | 北京信诺达泰思特科技股份有限公司 | Measurement circuit module |
-
2013
- 2013-01-30 CN CN2013100342019A patent/CN103149417A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201083789Y (en) * | 2007-09-14 | 2008-07-09 | 厦门科华恒盛股份有限公司 | Device for detecting DC far-conveyed power line on current unbalancing |
| US20110156811A1 (en) * | 2009-12-24 | 2011-06-30 | Denso Corporation | Voltage detection device |
| CN201654110U (en) * | 2010-04-30 | 2010-11-24 | 浙江天煌科技实业有限公司 | Device for measuring relative voltage |
| CN201955383U (en) * | 2011-02-17 | 2011-08-31 | 甘肃电力科学研究院 | Measuring device for directly measuring voltage difference between two high-voltage ends |
| CN102288919A (en) * | 2011-05-11 | 2011-12-21 | 张兴发 | Voltage measuring system and method for battery |
| CN203084063U (en) * | 2013-01-30 | 2013-07-24 | 北京信诺达泰思特科技股份有限公司 | Measurement circuit module |
Non-Patent Citations (1)
| Title |
|---|
| 佚名: "差分放大器：The Difference Amplifier", 《HTTP://WWW.ELECFANS.COM/DIANLUTU/AMP/2009051660232.HTML》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154136A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A kind of detection tool of operational amplifier integrated circuit |
| CN106154136B (en) * | 2016-06-20 | 2018-11-16 | 泉州市弘丰农农业技术有限公司 | A kind of detection jig of operational amplifier integrated circuit |
| CN109581029A (en) * | 2018-12-05 | 2019-04-05 | 郑州云海信息技术有限公司 | A kind of system for detecting multi input end current balance type |
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