CN2636387Y - Controllable varistor box - Google Patents
Controllable varistor box Download PDFInfo
- Publication number
- CN2636387Y CN2636387Y CN 03269727 CN03269727U CN2636387Y CN 2636387 Y CN2636387 Y CN 2636387Y CN 03269727 CN03269727 CN 03269727 CN 03269727 U CN03269727 U CN 03269727U CN 2636387 Y CN2636387 Y CN 2636387Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- resistance value
- base value
- network unit
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Adjustable Resistors (AREA)
Abstract
The utility model discloses a controllable resistance switching box comprising a plurality of resistance network units in series connection. The resistance value of each resistance network unit can be adjusted in the scope of 0 to 9 times of its benchmark resistance value; the benchmark resistance value among different resistance network units differs from one another by tens or hundreds of times; the resistance value of each resistance network unit can be switched in the scope of 0 to 9 times of its benchmark resistance value, so that the resistance value of the whole resistance switching box can be indicated by the increase and decrease principle of natural number. The utility model can, according to the resistance value commands sent by computer, conduct automatic, accurate and real time adjustment of load resistance, so as to realize the automation for a plurality of tests. Therefore, the utility model can be widely applied for the tests in the fields of electric power, electrical engineering and electronics as well as relevant experiment teaching in colleges.
Description
Technical field
The utility model relates to a kind of circuit block, specifically a kind of controlled variable rheostat.
Background technology
In the test job of multiple generator, motor, and in multiple electric power, Experiment of Electrical Engineering, need carry out accurate, automatic, real-time adjusting to pure load resistance.The current slide rheostat that mainly is to use adopts artificial mode to regulate.This rheostat and corresponding manual adjustment mode have defectives such as the low and real-time difference of efficient, can not adapt to experiment and real-time testing requirements of one's work.
The content of utility model
The purpose of this utility model just provides the controlled variable rheostat that a kind of excursion is big, degree of regulation is high, to realize automatic, the accurate and real-time adjusting of load resistance.
The utility model is achieved in that controlled variable rheostat is made up of several resistor network units in series, the resistance value of each resistor network unit with the 0-9 of base value resistance separately doubly ten grades adjustable, the base value resistance of each resistor network unit differs ten times, hundred times or higher.Promptly in controlled variable rheostat, what resistor network unit that are connected in series are mutually arranged, how much individual base value resistance that differs by the order of magnitude is just arranged.Since the resistance value of each resistor network unit can the 0-9 of its base value resistance doubly between conversion, the resistance value of whole like this variable rheostat just can represent with the conversion of natural increase and decrease rule, that is:
R
∑＝(0～9)R+10×(0～9)R+100×(0～9)R+…
Can realize the wide variation and the high accuracy adjusting of controlled variable rheostat resistance value thus.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of implementation of the present utility model.
Embodiment
In controlled variable rheostat shown in Figure 1, be serially connected with four resistor network unit A
1-A
4, wherein set the A of low order end
4Be the resistor network unit of benchmark, then be followed successively by the base value resistor network unit of ten times, hundred times and thousand times left by it.If that is setting resistor network unit A
4The base value resistance value be R, resistor network unit A then
3, A
2And A
1The resistance of base value resistance just be followed successively by 10R, 100R and 1000R respectively.
Each resistor network unit has identical circuit structure, wherein a kind of implementation preferably is by after one times of base value resistance R of two times of base value resistance 2R serial connections, connect the again parallel circuits of three times of base value resistance and six times of base value resistance 6R, at the two ends of two times, one times and six times base value resistance respectively and be connected to contactor KM
1, KM
2And KM
3, be serially connected with contactor KM at the end of three times of base value resistance 3R
4Like this, each network element is made up of four shunt resistances and four contactors.By adhesive, the off-state that changes four contactors, can make each resistor network unit occur the resistance value of 0-9 times of base value resistance respectively.The break-make of four contactors changes as shown in the table with the corresponding Changing Pattern of this resistor network cell resistance value:
Table 1: the resistance value of single resistor network unit and contactor state relation
| Resistance | 0 R 2R 3R 4R 5R 6R 7R 8R 9R |
| KM1 KM2 KM3 KM4 | 1 1 1 0 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 1 0 1 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 |
Annotate: " 1 " is adhesive in the table 1, and " 0 " is for disconnecting.
Controlled for the resistance that realizes this variable rheostat, can the on off operating mode of each contactor be realized by computer-control bus driving silicon controlled break-make by computer.
The precision of controllable resistor case depends on the precision of base value resistance R, can increase network element according to actual needs, to change the scope of resistance.
The utility model can instruct according to the resistance value that computer sends, and load resistance is carried out automatic, accurate, real-time adjusting, to realize the automation of multiple test job.The utility model can be widely used in the dependence test work of electric power, electrician, electronic applications, also can be applicable in the relevant experimental teaching of universities and colleges.
Claims (2)
1, a kind of controlled variable rheostat, it is characterized in that this variable rheostat is made up of several resistor network units in series, the resistance value of each resistor network unit with the 0-9 of base value resistance separately doubly ten grades adjustable, the base value resistance of each resistor network unit differs ten times, hundred times or higher.
2, controlled variable rheostat according to claim 1, it is characterized in that each resistor network unit is the parallel circuits by connect again after one times of base value resistance R of two times of base value resistance 2R serial connection three times of base value resistance and six times of base value resistance 6R, respectively and be connected to contactor KM at the two ends of two times, one times and six times base value resistance
1, KM
2And KM
3, be serially connected with contactor KM at the end of three times of base value resistance 3R
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03269727 CN2636387Y (en) | 2003-07-25 | 2003-07-25 | Controllable varistor box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03269727 CN2636387Y (en) | 2003-07-25 | 2003-07-25 | Controllable varistor box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2636387Y true CN2636387Y (en) | 2004-08-25 |
Family
ID=34300127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03269727 Expired - Fee Related CN2636387Y (en) | 2003-07-25 | 2003-07-25 | Controllable varistor box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2636387Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102254661A (en) * | 2011-04-12 | 2011-11-23 | 中兴通讯股份有限公司 | Method and device for realizing resistor with integer resistance value range |
| CN102280237A (en) * | 2010-06-11 | 2011-12-14 | 吴昌德 | Method for adjusting resistance values |
-
2003
- 2003-07-25 CN CN 03269727 patent/CN2636387Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280237A (en) * | 2010-06-11 | 2011-12-14 | 吴昌德 | Method for adjusting resistance values |
| CN102254661A (en) * | 2011-04-12 | 2011-11-23 | 中兴通讯股份有限公司 | Method and device for realizing resistor with integer resistance value range |
| CN102254661B (en) * | 2011-04-12 | 2015-09-16 | 中兴通讯股份有限公司 | Realize method and the device of integer Standard resistance range resistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |