CN214205480U

CN214205480U - Adjustable resistance device

Info

Publication number: CN214205480U
Application number: CN202022924031.XU
Authority: CN
Inventors: 谢光明; 李川
Original assignee: Zhuzhou Yixing Science And Technology Co ltd
Current assignee: Zhuzhou Yixing Science And Technology Co ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-09-14
Anticipated expiration: 2030-12-09

Abstract

An adjustable resistance device comprises N +1 load modules, wherein each load module comprises five precision resistors R_1+5N~R_5+5NWherein the precision resistor R_2+5N~R_4+5NAfter being connected in parallel with a precision resistor R_1+5NAre connected in series; five precision resistors R_1+5N~R_5+5NThe resistance ratio of (1) is 5:4:3:2:1, and the precision resistor R_2+5N~R_5+5NAre respectively connected in series with rocker switches S_3+7N~S_6+7NRear parallel rocker switch S_7+7NPrecision resistor R_1+5NAnd a rocker switch S_1+7NAfter being connected in series, the two-way valve is also connected in parallel with a rocker switch S_2+7NWherein N is a non-negative integer; the N +1 load modules are sequentially connected in series and then pass through an output port (OUT)+, OUT-) output. The number of the required connections of the load module can be flexibly determined according to the number of effective digits of the resistance value to be output by combining the five precision resistors in series and parallel, so that the precision adjustability of the load output impedance within a certain range is realized, and the flexibility and the expansibility are strong.

Description

Adjustable resistance device

Technical Field

The utility model relates to an inspection detection area especially relates to an adjustable resistance device.

Background

At present, a manual resistance box and an adjustable potentiometer are generally adopted for adjusting the resistance value of the resistor. Wherein the manual resistance box has the following defects: firstly, a resistance value of a manual resistance box is adjusted through a rotary switch on an operation panel, a resistor corresponding to each gear of the rotary switch is connected in series, an operator needs to adjust resistance values of a plurality of gears simultaneously to output a specified resistance value, the larger the adjusted resistance value is, the larger the number of the rotary switches which need to be operated simultaneously is, and the working strength of the operator is high. Secondly, the dial of the rotary switch is divided into 0-9 fixed numerical identifiers, when the current position and the adjusting position on the dial are discontinuous end to end, the rotary switch needs to be twisted for many times until the adjusting position is reached, the jumping change cannot be realized, and the working efficiency is low. And thirdly, the rotary switch has certain resistance when being twisted, and the fingers can feel discomfortable such as red, swelling, aching and the like when the rotary switch is twisted by overcoming the resistance for a long time. The manual resistance box is internally composed of resistors with fixed resistance values, when the ambient temperature changes or the rotary switch contacts are oxidized, the precision of the output resistance value is influenced, and because no resistance box is provided and closed-loop control is not carried out, the influence caused by the ambient temperature and the contact oxidation cannot be eliminated. The adjustable potentiometer is continuously adjustable, the resistance value is changed by rotating the potentiometer knob in a manual mode, the resistance value can only be roughly adjusted in the manual mode, and the resistance value cannot be precisely adjusted.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses a technical scheme as follows: the adjustable resistor device comprises N +1 load modules, wherein each load module comprises five precision resistors R_1+5N~R_5+5NWherein the precision resistor R_2+5N ~R_4+5NAfter being connected in parallel with a precision resistor R_1+5NAre connected in series; five precision resistors R_1+5N~R_5+5NThe resistance ratio of (1) is 5:4:3:2:1, and the precision resistor R_2+5N ~R_5+5NAre respectively connected in series with rocker switches S_3+7N~S_6+7NRear parallel rocker switch S_7+7NPrecision resistor R_1+5NAnd a rocker switch S_1+7NAfter being connected in series, the two-way valve is also connected in parallel with a rocker switch S_2+7NWherein N is a non-negative integer; the N load modules are sequentially connected in series and then output through output ports (OUT +, OUT-).

Further, the LED lamp also comprises a power module and a direct current resistance testing device LCR1 which are electrically connected with each other, wherein the input end of the direct current resistance testing device LCR1 is connected with the output ports (OUT +, OUT-) of the load module, and the direct current resistance testing device LCR1 is also connected with a multi-segment code display screen LED 1.

Further, the power supply module BOX comprises a relay module BOX1 electrically connected with the power supply module, wherein the relay module BOX1 comprises 7(N +1) relays, and the relay contact KA is_NRespectively and precision resistors R_2+5N ~R_5+5NAfter being connected in series, the relay contact KA_22+2NParallel, precision resistor R_1+5NAnd relay contact KA_NAfter series connection with KA_21+2NParallel connection; relay coil in relay module BOX1 and photoelectric coupler K_NConnecting; the relay module BOX1 is also connected to the upper computer PC1 via a communication cable W2.

Further, the upper computer PC1 is connected with a direct current resistance testing device LCR1 through a communication cable W1.

Further, the power module comprises a switching power supply U1, a storage battery BAT1 and an external power supply X1, wherein the external power supply X1 is connected with the switching power supply U1, and the storage battery BAT1 is connected with the switching power supply U1 and is connected with a relay module BOX 1.

Further, let N =3, i.e. four load modules connected in series in sequence, wherein the precision resistor R is connected in series_1+5NResistance value of 5 x 10^1-NOmega, precision resistance R_2+5NResistance value of 4 x 10^1-NOmega, precision resistance R_3+5NResistance value of 3 x 10^1-NOmega, precision resistance R_4+5NResistance value of 2 x 10^1-NOmega, precision resistance R_5+5NResistance value of 1 x 10^1-NΩ。

The utility model has the advantages of it is following:

1. the adjustable resistance device provided by the utility model can flexibly determine the number of the load modules required to be connected according to the number of the effective digits of the resistance value required to be output by combining the five precise resistors in series and parallel and setting the resistance ratio of the five precise resistors to 5:4:3:2:1, thereby realizing the precise adjustment of the load output impedance within a certain range and having strong flexible expansibility.

2. By the direct current resistance testing device LCR1 and the load feedback and the load output digital display of the multi-section code display screen LED1, the closed-loop control and the visual adjustment of the load output impedance within a certain range are realized.

3. Through the signal connection of the upper computer PC1 and the relay module BOX1, the relay output contact in the relay module BOX1 can be controlled to be closed by setting a related output impedance value through the upper computer PC1 according to the resistance value required to be output, and the automatic adjustment of the output impedance of the load module is realized.

Drawings

FIG. 1: a schematic diagram of a circuit structure of the adjustable resistance device.

Detailed Description

In order that those skilled in the art can fully practice the invention, the following detailed description will be given with reference to the accompanying drawings.

The adjustable resistance device also comprises N +1 load modules, and each load module comprises five precision resistors R_1+5N~R_5+5NWherein the precision resistor R_2+5N ~R_4+5NAfter being connected in parallel with a precision resistor R_1+5NAre connected in series; five precision resistors R_1+5N~R_5+5NThe resistance ratio of (1) is 5:4:3:2:1, and the precision resistor R_2+5N ~R_5+5NAre respectively connected in series with rocker switches S_3+7N~S_6+7NRear parallel rocker switch S_7+7NPrecision resistor R_1+5NAnd a rocker switch S_1+7NAfter being connected in series, the two-way valve is also connected in parallel with a rocker switch S_2+7NWherein N is a non-negative integer; the N load modules are sequentially connected in series and then output through output ports (OUT +, OUT-).

In this embodiment, five precision resistors R in each load module_1+5N~R_5+5NConnected in series-parallel combination, and the resistance ratio is set. When the precise resistor access circuit is required to provide load impedance correspondingly, the rocker switch connected with the precise resistor in series is operated to be closed, otherwise, the rocker switch connected with the precise resistor in parallel is operated to be in short circuit. The load modules are connected in series through signal lines, and the load impedance can be flexibly selected according to the output requirementThe number of load modules required.

In a practical application scenario, the impedance of the load output is affected by external influences such as environmental temperature change, lead length, oxidation of a precise resistor device and the like, in order to further accurately control the output impedance of the load module, the input end of the direct current resistance testing device LCR1 is connected with the output ports (OUT +, OUT-) of the load module, and the direct current resistance testing device LCR1 is further connected with the multi-segment code display screen LED 1. The direct current resistance testing device LCR1 realizes load module output impedance closed-loop control and visual adjustment by collecting resistance signals of output ports (OUT +, OUT-) of the load module and digitally displaying the resistance signals on the multi-section code display screen LED 1. When the actual output impedance deviates from the set value, the corresponding rocker switches are operated according to the deviation value to control the corresponding precision resistors to be connected or short-circuited so as to further adjust the output impedance.

Although the output impedance of the load module can be accurately adjusted by manually operating the rocker switch, the number of the rocker switches operated by the manually operating rocker switch is large, and the operation is complicated, so that the relay module BOX1 and the upper computer PC1 are connected through the communication cable W2 in the embodiment, the relay module BOX1 comprises 7(N +1) relays, and the relay contact KA is connected with the relay contact KA_NRespectively and precision resistors R_2+5N ~R_5+5NAfter being connected in series, the relay contact KA_22+2NParallel, precision resistor R_1+5NAnd relay contact KA_NAfter series connection with KA_21+2NParallel connection; relay coil in relay module BOX1 and photoelectric coupler K_NAnd (4) connecting. When load impedance with a certain value is required to be output, a corresponding load impedance value is set in the upper computer PC1, a relay coil in the relay module BOX1 is controlled to be closed, and the relay coil is controlled to be closed through a corresponding relay contact KA_NThe closing of the resistors controls the corresponding precision resistors to be connected or shorted, so that the impedance value between the output ports (OUT +, OUT-) of the final load module is adjusted. The relay coil closing control logic within the relay module BOX1 is the same logic as the manually operated rocker switch.

The upper computer PC1 can also be connected with a direct current resistance testing device LCR1 through a communication cable W1, the direct current resistance testing device LCR1 feeds back the acquired impedance value between the output ports (OUT +, OUT-) of the load module to the upper computer PC1, and the impedance value between the output ports (OUT +, OUT-) of the load module is automatically adjusted.

Next, a specific embodiment of adjusting the output impedance of 0 to 99.99 Ω will be described with reference to fig. 1.

Since the load output impedance needs to be adjustable between 0 Ω to 99.99 Ω, including four significant digits, where the integer digit is two digits and the decimal digit is two digits, the number of load modules is set to 4 in series in this embodiment, where the precision resistors R are connected in series in sequence_1+5NResistance value of 5 x 10^1-NOmega, precision resistance R_2+5NResistance value of 4 x 10^1-NOmega, precision resistance R_3+5NResistance value of 3 x 10^1-NOmega, precision resistance R_4+5NResistance value of 2 x 10^1-NOmega, precision resistance R_5+5NResistance value of 1 x 10^1-NOmega. When the resistance value of 83.51 omega is output between the output ports (OUT +, OUT-) of the load module group needs to be controlled, the value is converted into 50+30+3+0.5+0.01 omega, namely R1 and R3 are connected in the first load module, R8 is connected in the second load module, R11 is connected in the third load module, R20 is connected in the fourth load module, and the corresponding closed relay contact is KA₁、KA₃、KA₂₃、KA₈、KA₁₁、KA₂₆、KA₂₇、KA₂₀And when the relay contacts are closed, the rest relay contacts are opened, and the logic of the manual operation rocker switch is the same as the logic of the closing of the relay contacts, so that the impedance output of 83.51 omega is realized. In the present embodiment, the relay KA in the relay module BOX1₂₉~KA₃₂And a photoelectric coupler K₂₉~ K₃₂Are all reserved.

Obviously, the above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An adjustable resistance device, characterized by: still include N +1 load module, every load module all includes five precision resistance R_1+5N~R_5+5NWherein the precision resistor R_2+5N ~R_4+5NAfter being connected in parallel with a precision resistor R_1+5NAre connected in series; five precision resistors R_1+5N~R_5+5NThe resistance ratio of (1) is 5:4:3:2:1, and the precision resistor R_2+5N ~R_5+5NAre respectively connected in series with rocker switches S_3+7N~S_6+7NRear parallel rocker switch S_7+7NPrecision resistor R_1+5NAnd a rocker switch S_1+7NAfter being connected in series, the two-way valve is also connected in parallel with a rocker switch S_2+7NWherein N is a non-negative integer; the N +1 load modules are sequentially connected in series and then output through output ports (OUT +, OUT-).

2. An adjustable resistance arrangement as recited in claim 1, wherein: the LED load module further comprises a power module and a direct current resistance testing device LCR1 which are electrically connected with each other, the input end of the direct current resistance testing device LCR1 is connected with the output ports (OUT +, OUT-) of the load module, and the direct current resistance testing device LCR1 is further connected with a multi-segment code display screen LED 1.

3. An adjustable resistance arrangement as claimed in claim 2, wherein: the power supply module BOX comprises a power supply module and a relay module BOX1 electrically connected with the power supply module, wherein the relay module BOX1 comprises 7(N +1) relays, and a relay contact KA_NRespectively and precision resistors R_2+5N ~R_5+5NAfter being connected in series, the relay contact KA_22+2NParallel, precision resistor R_1+5NAnd relay contact KA_NAfter series connection with KA_21+2NParallel connection; relay coil in relay module BOX1 and photoelectric coupler K_NConnecting; the relay module BOX1 is also connected to the upper computer PC1 via a communication cable W2.

4. An adjustable resistance arrangement as claimed in claim 3, wherein: the upper computer PC1 is connected with the direct current resistance testing device LCR1 through a communication cable W1.

5. An adjustable resistance arrangement as recited in claim 4, wherein: the power module comprises a switching power supply U1, a storage battery BAT1 and an external power supply X1, wherein the external power supply X1 is connected with the switching power supply U1, and the storage battery BAT1 is connected with the switching power supply U1 and is connected with a relay module BOX 1.

6. An adjustable resistance arrangement as claimed in any one of claims 1 to 5, wherein: connecting N =3, four load modules in series in sequence, wherein the precision resistor R_1+5NResistance value of 5 x 10^1-NOmega, precision resistance R_2+5NResistance value of 4 x 10^1-NOmega, precision resistance R_3+5NResistance value of 3 x 10^1-NOmega, precision resistance R_4+5NResistance value of 2 x 10^1-NOmega, precision resistance R_5+5NResistance value of 1 x 10^1-NΩ。