CN101515000B - Method and device for improving measuring precision of current magnitude - Google Patents

Method and device for improving measuring precision of current magnitude Download PDF

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Publication number
CN101515000B
CN101515000B CN2008100052725A CN200810005272A CN101515000B CN 101515000 B CN101515000 B CN 101515000B CN 2008100052725 A CN2008100052725 A CN 2008100052725A CN 200810005272 A CN200810005272 A CN 200810005272A CN 101515000 B CN101515000 B CN 101515000B
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China
Prior art keywords
temperature
shunt
current
power
pcc
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CN101515000A (en
Inventor
王志贤
黄俊渊
吴健铭
杨淦棋
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Chroma Electronics Shenzhen Co Ltd
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Chroma Electronics Shenzhen Co Ltd
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Priority to CN2008100052725A priority Critical patent/CN101515000B/en
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Abstract

The invention provides a method and a device for improving the measuring precision of current magnitude. A current divider is used as a measuring instrument to ensure stable current measurement; and a preheating and temperature constant unit is designed to calculate the highest temperature T1 when the current divider passes through the maximum current in advance, preheat the current divider to a temperature T2 slightly higher than the highest temperature T1, and maintain the temperature of the current divider at the temperature T2 so as to make the temperature of the current divider and the relative resistance value thereof constant. The current divider can maintain constant resistance value under any current output/input conditions; therefore, the method and the device can provide the constant resistance value for the measuring instrument to obtain good current measuring accuracy.

Description

The method of improving measuring precision of current magnitude and device thereof
Technical field
What the present invention relates to is a kind of measuring instrument field, be particularly related to be a kind of under different electric currents the temperature one of may command shunting device show and keep its relative resistance value constant, the precision method for improving and the device thereof that make the current value of measurement under different current conditions, all have identical degree of accuracy.
Background technology
In the measuring instrument field, DC power supply is the DC power supply device of high-performance, high stability, and DC power output can be provided, and is research and development, production test and the QC check that is applied in various consumer, industry and aerospace electron product.
In the past in order to reach the function of deciding electric current, can use a kind of shunt when measuring current value big or small, make shunt flow through minimum current and maximum current, its resistance change can remain unchanged.So, the shunt that must select far to surpass rated current uses, so that shunt is by minimum current and maximum current the time, the temperature variation of its shunt can remain unchanged, can keep the shunt resistance value to fix, reach under different electric currents and can both have good measuring precision of current magnitude.
For can the holding temperature variable quantity constant, and have good measuring precision of current magnitude, the utilization of therefore existing shunt is the shunt that must select big rated current, thus, shunt takes up room greatly, cost is raising relatively also.
The defective that the inventor uses at above-mentioned traditional shunt, concentrating on studies and being aided with cooperates scientific principle and actual state, proposes a kind of reasonable in design and can effectively improve and must select than the invention with the defective of keeping resistance value and temperature of the shunt of rated current greatly.
Summary of the invention
Fundamental purpose of the present invention, be that mainly shunt is under any electric current output/input condition, can effectively improve the measuring precision of current magnitude of current measurement circuit under different size of current situations, solve shunt and when different electric current, have different resistance values, the current measurement error that is caused.
Technological means of the present invention be by a kind ofly be arranged in the measuring instrument, can be to the device of improving measuring precision of current magnitude, make the current measurement of measuring instrument stable, include: one has the shunt of an insulation course, wherein, described insulation course is provided with (PCC) power and the temperature module, receives a heating instruction by (PCC) power and can make shunt be heated to a preheat temperature, passes through the temperature module, can detect the temperature of shunt, and send the signal of a may command thermal value.Temperature sensing unit receives the signal of the temperature module, and the temperature of sensing shunt is also exported a signal; And preheating and constant temperature unit, the output signal of reception temperature sensing unit can heat shunt, and make the temperature of shunt remain on a preheat temperature.
By above-mentioned technical characterstic, the present invention can reach in same current and measure under the condition of precision, has the less shunt of (1) available rated current and measures big electric current.(2) can save the shared space of shunt, power density is improved.(3) reduce the shunt cost.
Description of drawings
Shown in Figure 1 is improving measuring precision of current magnitude device synoptic diagram of the present invention; With
Fig. 2 is the motion flow of improving measuring precision of current magnitude device of the present invention.
Description of reference numerals: 1-shunt; The 11-insulation course; The 2-(PCC) power; The 3-the temperature module; The 4-temperature sensing unit; 5-preheating and constant temperature unit.
Embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.Device about improving measuring precision of current magnitude sees also shown in Figure 1, device of the present invention includes: shunt 1, (PCC) power 2, the temperature module 3, temperature sensing unit 4 and preheating and constant temperature unit 5, wherein said shunt 1 is provided with insulation course 11, shunt 1 accessible preheating and constant temperature function, be to utilize (PCC) power 2 to combine with shunt 1 with the temperature module 3, (PCC) power 2 and the temperature module 3 are to depend on to be sticked or otherwise to be fixed on the insulation course 11 of shunt 1, and adopt non-electric-connecting mode to fix, by 1 heating of 2 pairs of shunts of (PCC) power, the temperature module 3 will be detected the temperature after shunt 1 is heated.The temperature that is measured by the temperature module 3, can control (for example: metal-oxide half field effect transistor MOSFET or bipolar transistor IGBT or bipolar junction transistor BJT etc. are operated in linear zone) to the thermal value of power controlling assembly 2, make shunt 1 can reach preheat temperature T2.
As a rule, if measuring instrument is when using shunt as current measurement, and the precision of described current measurement will be influenced by the temperature variant resistance change of shunt.So, at first, roughly can estimate under certain specification in advance, described shunt can pass through maximum current the time the value of maximum temperature T1.
The temperature of being detected by 3 pairs of shunts 1 of the temperature module, the thermal value of power controlling assembly 2, the temperature signal that measurement is obtained by temperature sensing unit 4 provides and gives preheating and constant temperature unit 5, shunt 1 is preheating to the temperature T 2 that is slightly higher than maximum temperature T1 by preheating and constant temperature unit 5, then utilize preheating and constant temperature unit 5 to make the temperature of shunt 1 remain on temperature T 2 again, and make shunt 1 under different current conditions, keep its resistance value constant simultaneously, then the precision of current measurement can not exported/size of input current influences.
According to above-mentioned described device, the method that the present invention can promote measuring precision of current magnitude is to comprise the following step:
Step 1; Use the surveying instrument of shunt as current measurement, the precision of its current measurement will be determined by the temperature variant resistance change of shunt, the maximum temperature T1 when therefore precomputing shunt by maximum current;
Step 2; The setting power assembly makes the temperature T 2 of shunt a little more than maximum temperature T1;
Step 3; The temperature module measuring shunt temperature;
Step 4; Utilize the temperature of the shunt that temperature sensing unit obtains sensing to provide again and give preheating and constant temperature unit;
Step 5; At the temperature that measures, the power controlling assembly adds heat, makes shunt reach preheat temperature T2, and keeps fixing for shunt temperature T 2.
Therefore the present invention proposes a kind of method of improving measuring precision of current magnitude, general current measurement circuit is when using shunt to measure current value big or small, owing to the resistance value of shunt can change along with temperature, and the temperature of shunt can change along with the electric current that passes through, therefore, shunt has different resistance values under different electric currents, cause the current value of its measurement also can change along with temperature, so produce the current measurement error; So the present invention proposes under different electric currents, to control the temperature unanimity of shunt, keep its resistance value constant, the current value that makes its measurement good measuring precision of current magnitude of tool all under different current conditions.
According to above-mentioned disclosed technology contents, the present invention can effectively improve the measuring precision of current magnitude of current measurement circuit under different size of current situations, solves shunt and have different resistance values, the current measurement error that is caused when different electric current.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.

Claims (5)

1. the device of an improving measuring precision of current magnitude is characterized in that: can provide the current measurement of measuring instrument stable, it comprises:
One has the shunt of an insulation course, and wherein, described insulation course is provided with a (PCC) power and a temperature module, wherein:
Described (PCC) power receives a heating instruction and can make shunt be heated to a preheat temperature;
Described the temperature module can be detected the temperature of shunt, and sends the signal of a may command thermal value;
One temperature sensing unit is the signal that receives the temperature module, and the temperature of sensing shunt is also exported a signal; And
One preheating and constant temperature unit, the output signal of reception temperature sensing unit can heat shunt, and make the temperature of shunt remain on a preheat temperature.
2. according to the device of the described improving measuring precision of current magnitude of claim 1, it is characterized in that: described (PCC) power is a metal-oxide half field effect transistor.
3. the device of improving measuring precision of current magnitude according to claim 1, it is characterized in that: described (PCC) power is a bipolar transistor.
4. the device of improving measuring precision of current magnitude according to claim 1, it is characterized in that: described (PCC) power is bipolar junction transistor.
5. the method for an improving measuring precision of current magnitude, it is characterized in that: can provide the current measurement of measuring instrument stable, described measuring instrument has a shunt that is provided with a (PCC) power and a temperature module, receive a heating instruction by described (PCC) power and can make the shunt heating, can detect the temperature of shunt by the temperature module, and send the signal of a may command thermal value, one temperature sensing unit can receive the signal of the temperature module, one preheating and constant temperature unit are the output signals that receives temperature sensing unit, and described method comprises the following step:
Step 1: the maximum temperature T1 when trying to achieve shunt by maximum current;
Step 2: set shunt to temperature T 2, temperature T 2 is a little more than maximum temperature T1;
Step 3: by the temperature module the temperature of shunt is detected, and sent the signal of a may command thermal value;
Step 4: by temperature sensing unit the temperature signal of shunt is provided and to give preheating and constant temperature unit;
Step 5: at the temperature that measures, the power controlling assembly adds heat, make shunt reach preheat temperature T2, and it is fixing to make shunt temperature T 2 keep.
CN2008100052725A 2008-02-20 2008-02-20 Method and device for improving measuring precision of current magnitude Active CN101515000B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008100052725A CN101515000B (en) 2008-02-20 2008-02-20 Method and device for improving measuring precision of current magnitude

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Application Number Priority Date Filing Date Title
CN2008100052725A CN101515000B (en) 2008-02-20 2008-02-20 Method and device for improving measuring precision of current magnitude

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CN101515000A CN101515000A (en) 2009-08-26
CN101515000B true CN101515000B (en) 2011-03-09

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CN2008100052725A Active CN101515000B (en) 2008-02-20 2008-02-20 Method and device for improving measuring precision of current magnitude

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112181027B (en) * 2019-07-01 2022-04-01 致茂电子(苏州)有限公司 Temperature control circuit and temperature control system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开2007-278938A 2007.10.25

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