CN116190027B - Adjustable resistor with low inductance - Google Patents
Adjustable resistor with low inductance Download PDFInfo
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- CN116190027B CN116190027B CN202310286144.7A CN202310286144A CN116190027B CN 116190027 B CN116190027 B CN 116190027B CN 202310286144 A CN202310286144 A CN 202310286144A CN 116190027 B CN116190027 B CN 116190027B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/06—Adjustable resistors adjustable by short-circuiting different amounts of the resistive element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/16—Adjustable resistors including plural resistive elements
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Abstract
The invention discloses an adjustable resistor with low inductance, which belongs to the technical field of power electronics, wherein N branches are connected in parallel between an input end and an output end of the adjustable resistor, N is an integer greater than 1, and a switch and a resistor are connected in series on each of a1 st branch to an N th branch, wherein: the opening and closing of the 1 st switch to the N switch are controlled by a singlechip or a computer; the resistance value of the N-th resistor is 2 （N‑1） times that of the first resistor, and the resistance value of the first resistor ranges from 0.01Ω to 1Ω; according to the condition of the load, resistors with different resistance values can be connected in parallel in the whole circuit by controlling the opening and closing of the first switch to the Nth switch so as to be matched with corresponding output resistors. Compared with the existing series, parallel and stepping switching circuits, the circuit has high control precision and simple control method, and can effectively reduce distributed inductance.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an adjustable resistor with low inductance.
Background
In power electronic test equipment and practical applications, particularly in high-voltage and high-current applications, due to load characteristic variation and unpredictable load characteristics, it is often necessary to control the output resistance of a driver according to the load condition, and there are various control modes of the existing driving resistance: for example, the method can be realized by series connection, parallel connection, step switching and the like, and the specific cases are as follows:
1) Manual shifting, while simple, is difficult to achieve when in a space where it is not readily accessible.
2) In a series stepping scheme, series inductance is introduced, especially when switching resolution is required to be high and series progression is high, more distributed inductance is introduced, which is sometimes not allowed for testing and application of high frequency devices. In severe cases, unpredictable results may occur, even resulting in damage to the high frequency device under test. For example: when the control precision of the resistor is to be improved, the number of series stages is large, and under the condition of ensuring the precision in the whole range, the larger the resistance value, the larger the number of series stages, the larger the introduced inductance, and sometimes the multiple increase, the test and the test result can be seriously affected.
3) In the parallel control scheme, although the introduced distributed inductance is small, the equivalent resistance after parallel connection is required to be calculated, and the control calculation method is relatively complex when parallel connection is performed.
Disclosure of Invention
Aiming at the technical problems, the circuit control precision is high, the control method is simple, the distributed inductance can be effectively reduced, and the scheme can be used for rapidly matching the required resistance through the conductance conversion thought and the binary conversion method.
The invention solves the problems by the following technical means:
the utility model provides an adjustable resistor with low sense, its characterized in that has N branch circuits in parallel between adjustable resistor's the input and the output, and N is greater than 1's integer, has a switch and a resistance in series on the 1 st branch circuit to the N branch circuit, wherein:
the opening and closing of the 1 st switch to the N switch are controlled by a singlechip or a computer;
the resistance value of the N-th resistor is 2 （N-1） times that of the first resistor, and the resistance value of the first resistor ranges from 0.01Ω to 1Ω;
According to the condition of the load, resistors with different resistance values can be connected in parallel in the whole circuit by controlling the opening and closing of the first switch to the Nth switch so as to be matched with corresponding output resistors.
Preferably, N is an even number greater than or equal to 10.
Preferably, the resistance value of the first resistor is one of 0.05Ω, 0.1Ω, 0.5Ω, or 1Ω.
Preferably, the device comprises the following control method:
1) Calculating a conductance value of the desired total output resistance based on the desired total output resistance;
2) Calculating the conductance value of the Nth resistor;
3) Calculating the ratio of the conductance value of the total output resistor to the conductance value of the Nth resistor, rounding the calculation result, and converting the calculation result into binary numbers;
4) The number of bits 2 0 of the binary number corresponds to the N switch opening and closing state, the number of bits 2 1 of the binary number corresponds to the N-1 switch opening and closing state, and the number of bits 2 （N-1） of the binary number corresponds to the 1 switch opening and closing state, wherein a value 0 represents that a switch is opened and a value 1 represents that the switch is closed;
5) The singlechip or the computer is used for controlling the opening and closing of the 1 st switch to the N switch, and the resistors with corresponding resistance values are connected in parallel in the whole circuit, so that the required total output resistance can be matched.
Preferably, the value of the required total output resistance is smaller than or equal to the resistance value of the nth resistor.
Preferably, the 1 st to nth switches are MOSFETs, IGBTs or transistors.
The adjustable resistor with low inductance has the following beneficial effects:
1) The circuit adopts a parallel control scheme, the introduced distributed inductance is small, different resistance values are combined and realized by adopting a parallel method in the parallel scheme, the largest distributed inductance is the inductance of a single resistor, and the more the parallel is, the smaller the distributed inductance is.
2) The circuit has high control precision and simple control method, and the scheme can be used for rapidly matching the required resistance by a conductivity conversion thought and a computer-friendly binary conversion method, so that the calculation efficiency is greatly improved.
3) The control requirements of different precision can be flexibly met by increasing the number of parallel resistors and adjusting the resistance value and the resistance difference value, and the matching precision can be controlled within 3%.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic representation of an embodiment of the present invention.
Description of the embodiments
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, in an adjustable resistor with low inductance, N branches are connected in parallel between an input end and an output end of the adjustable resistor, N is an integer greater than 1, and a switch and a resistor are connected in series on each of the 1 st branch to the N st branch, where N is 12, and in practical application, N may be any even number greater than or equal to 10.
In the figure, the opening and closing of the 1 st switch K1 to the N th switch KN are controlled by a singlechip or a computer, and specifically, the 1 st switch K1 to the N th switch KN are MOSFETs, IGBTs or transistors.
In specific application, the resistance of the nth resistor RN is 2 N-1 times that of the first resistor R1, the resistance of the first resistor R1 ranges from 0.01Ω to 1Ω, and preferably, the resistance of the first resistor R1 is one of 0.05Ω, 0.1Ω, 0.5Ω, or 1Ω. In this example, the resistance of the first resistor R1 may be 0.5Ω, where the resistance of the first resistor R1 is 2 times the resistance of the second resistor R2, the resistance of the first resistor R1 is 4 times the resistance of the third resistor R3, the resistance of the first resistor R1 is 5 times the resistance of the fourth resistor R4, and so on, to obtain the resistances of the first resistors R1 to R12 of 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 ohms, respectively.
The method specifically comprises the following steps of:
1) Calculating a conductance value of the required total output resistance A based on the required total output resistance A; specifically, the relationship between conductance and resistance is as follows: g=1/R, where G is the conductance R is the resistance in the series circuit and the total resistance is the sum of the individual series resistances. In a parallel circuit, the total conductance is equal to the sum of the conductance of the parallel branches.
2) Calculating the conductance value of the Nth resistor RN;
3) Calculating the ratio of the conductance value of the total output resistor A to the conductance value of the Nth resistor RN, rounding the calculation result, and converting the calculation result into binary numbers;
4) The number of bits 2 0 of the binary number corresponds to the opening and closing state of the N-th switch KN, the number of bits 2 1 of the binary number corresponds to the opening and closing state of the N-1 th switch KN-1, and the number of bits 2 N-1 of the binary number corresponds to the opening and closing state of the 1 st switch K1, wherein a value 0 represents that the switch is opened, and a value 1 represents that the switch is closed;
5) The opening and closing of the 1 st switch K1 to the N switch KN are controlled by a singlechip or a computer, and the resistors with corresponding resistance values are connected in parallel in the whole circuit, so that the required total output resistor A can be matched.
It should be noted that, the value of the required total output resistor a is smaller than or equal to the resistance value of the nth resistor RN, so that the normal operation can be performed.
In practical application, taking the total required output resistance A as 500 Ω as an example:
1) Calculating the conductance value of the required total output resistance A to be 0.02 based on the required total output resistance A;
2) Calculating the conductance value of the 12 th resistor R12 to be 1/1024;
3) Calculating the ratio of the conductance value of the total output resistor A to the conductance value of the N-th resistor RN, wherein 0.02/(1/1024) =2.048, rounding the calculation result, and converting the calculation result into binary number, wherein the binary number of 2 is 0010;
4) The 2 0 bits of the binary number 0010 is 0, corresponding to the on-off state of the 12 th switch K12; the number of bits of 2 1 of the binary number is 1, and corresponds to the opening and closing state of the 11 th switch K11; then, all the digits are 0; the number of 2 11 bits of binary numbers is not 0 either, and corresponds to the opening and closing state of a 1 st switch K1, wherein a value 0 represents that the switch is opened and a value 1 represents that the switch is closed;
5) The 11 th switch K11 is controlled to be closed by a singlechip or a computer, and the other 11 switches are opened, at the moment, the actual resistance of the whole circuit is 512 ohms, the total output resistance required by the close matching is 500 ohms, and if the accuracy is to be improved, the number of parallel resistors can be further increased.
Further, taking the total required output resistance a as 200 Ω as an example:
1) Calculating the conductance value of the required total output resistance A to be 0.005 based on the required total output resistance A;
2) Calculating the conductance value of the 12 th resistor R12 to be 1/1024;
3) Calculating the ratio of the conductance value of the total output resistor A to the conductance value of the N-th resistor RN to be 5.12, rounding the calculation result, converting the calculation result into binary numbers, and enabling the binary number of 5 to be 0101;
4) The 2 0 bits of the binary number 0010 is 1, corresponding to the on-off state of the 12 th switch K12; the number of bits of 2 1 of binary numbers is 0, corresponding to the opening and closing state of the 11 th switch K11, the number of bits of 2 2 of binary numbers is 1, corresponding to the opening and closing state of the 10 th switch K10; the other number of bits is 0. A value of 0 represents the switch being open and a value of 1 represents the switch being closed;
5) The 12 th switch K11 and the 10 th switch K10 are controlled to be turned on by a singlechip or a computer, and the other 10 switches are turned off, at the moment, the actual resistance of the whole circuit is 204.8 ohms, the total output resistance required by very close matching is 200 ohms, and if the precision is to be improved, the number of parallel resistors can be further increased.
The matching of the resistance values is operated by a singlechip or a computer, and the result is converted into a resistance combination which needs to be connected in parallel according to operation calculation. And then the control signal is output by the arithmetic unit, and the controller can control the switches K1-12 to work in a serial or parallel output mode.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. The utility model provides an adjustable resistor with low sense, its characterized in that has N branch circuits in parallel between adjustable resistor's the input and the output, and N is greater than 1's integer, has a switch and a resistance in series on the 1 st branch circuit to the N branch circuit, wherein:
the opening and closing of the first switch (K1) to the N switch (KN) are controlled by a singlechip or a computer;
the resistance of the N-th Resistor (RN) is 2 （N-1） times that of the first resistor (R1);
according to the condition of the load, resistors with different resistance values can be connected in parallel in the whole circuit by controlling the opening and closing of the first switch (K1) to the N switch (KN) so as to be matched with corresponding output resistors;
the N is an even number greater than or equal to 10;
The resistance value of the first resistor (R1) is one of 0.05Ω, 0.1Ω, 0.5Ω or 1Ω;
The control method comprises the following steps:
1) Calculating a conductance value of the required total output resistance (a) based on the required total output resistance (a);
2) Calculating the conductance value of the nth Resistor (RN);
3) Calculating the ratio of the conductance value of the required total output resistor (A) to the conductance value of the Nth Resistor (RN), rounding the calculation result, converting the calculation result into binary numbers, and adding zero to other bits to obtain an N-bit binary number;
4) The number of bits 2 0 of the binary number corresponds to the opening and closing state of an N-th switch (KN), the number of bits 2 1 of the binary number corresponds to the opening and closing state of an N-1 th switch (KN-1), the number of bits 2 （N-1） of the binary number corresponds to the opening and closing state of a first switch (K1), wherein a value 0 represents that the switch is opened, and a value 1 represents that the switch is closed;
5) Utilize singlechip or computer control first switch (K1) to the switching of N switch (KN), wherein: the first resistor (R1) is controlled by the first switch (K1), the N-th Resistor (RN) is controlled by the N-th switch (KN), and the resistors with corresponding resistance values are connected in parallel in the whole circuit, so that the required total output resistor (A) can be matched.
2. The adjustable resistor according to claim 1, wherein the value of the required total output resistance (a) is smaller than or equal to the resistance value of the nth Resistance (RN).
3. The adjustable resistor according to claim 2, characterized in that the first (K1) to nth (KN) switches are MOSFETs, IGBTs or transistors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310286144.7A CN116190027B (en) | 2023-03-23 | 2023-03-23 | Adjustable resistor with low inductance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310286144.7A CN116190027B (en) | 2023-03-23 | 2023-03-23 | Adjustable resistor with low inductance |
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| CN116190027A CN116190027A (en) | 2023-05-30 |
| CN116190027B true CN116190027B (en) | 2024-10-22 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112099558A (en) * | 2020-07-29 | 2020-12-18 | 窦红雨 | Load regulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1213312A (en) * | 1967-11-23 | 1970-11-25 | Marconi Co Ltd | Improvements in or relating to divider circuit arrangements |
| JPH0750204A (en) * | 1993-08-09 | 1995-02-21 | Hitachi Ltd | Digitally controlled variable resistor |
| JPH10135010A (en) * | 1996-10-29 | 1998-05-22 | Hitachi Zosen Corp | Digitally controlled variable resistance circuit |
| US20020180507A1 (en) * | 2001-05-31 | 2002-12-05 | Via Technologies, Inc. | Resistor network |
| CN100565215C (en) * | 2006-10-30 | 2009-12-02 | 郭晓松 | A kind of high power digital varistor method of testing |
| KR101174634B1 (en) * | 2010-07-26 | 2012-08-20 | 삼성전자주식회사 | The variable gain amplifier and the variable cutoff frequency filter which use linear-in-db programable resistors |
| CN205353237U (en) * | 2016-01-20 | 2016-06-29 | 国网山东省电力公司青岛供电公司 | Adjustable circuit of resistance and induced -current suppression device |
| CN114814556B (en) * | 2022-06-28 | 2022-10-04 | 苏州贝克微电子股份有限公司 | Efficient integrated circuit chip trimming test circuit and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112099558A (en) * | 2020-07-29 | 2020-12-18 | 窦红雨 | Load regulation method |
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