CN201017012Y - Load power indicator - Google Patents
Load power indicator Download PDFInfo
- Publication number
- CN201017012Y CN201017012Y CNU2007201190456U CN200720119045U CN201017012Y CN 201017012 Y CN201017012 Y CN 201017012Y CN U2007201190456 U CNU2007201190456 U CN U2007201190456U CN 200720119045 U CN200720119045 U CN 200720119045U CN 201017012 Y CN201017012 Y CN 201017012Y
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- China
- Prior art keywords
- current
- voltage converter
- voltage
- indicating gauge
- bearing power
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Abstract
The utility model relates to load power indicator and comprises a casing, a power connecting end (6) on the casing, an electric current pickup device (1), a current and voltage converter (3) and a display (5). The power connecting end (6) is connected with the external power of the casing and supplies power to all parts inside the instrument. The current pickup device (1) comprises two connecting ends, which are connected to two output ends of the current and voltage converter (3) respectively. The display (5) is connected to the output ends of the current and voltage converter (3) to display the voltage output by the current and voltage converter. The load power percent indicator of the utility model is provided with the beneficial effect that the load power indicator does not have to be connected in series to a power supply loop; the metering range can be changed and set conveniently when the indicator works; moreover, no equipment problem or human injury is caused due to the secondary open circuit.
Description
Technical field
The utility model relates to surveying instrument, more particularly, relates to a kind of bearing power indicating gauge.
Background technology
The bearing power indicating gauge is used for measuring the size of the real-time bearing power of supply line, and the result that will measure shows on display device, and the person of being to use can judge the working condition of load fast.Way commonly used is to measure the working current of its load, so that calculate the duty of load.In the prior art, normally feed circuit are disconnected, connect at the breakpoint place electric current or power-measuring device reach the purpose of monitoring described load current.But such way because described measurement mechanism becomes the part of whole supply line, may cause because of the range of selection to measure and be forbidden, also may be owing to second open circuit and for coming equipment breakdown and personal hidden danger.
The utility model content
The technical problems to be solved in the utility model is, be inconvenient to select and the equipment breakdown brought because of second open circuit and the defective of personal hidden danger at the above-mentioned range of prior art, provide a kind of range of selecting convenient and do not need to be connected on bearing power indicating gauge in the described feed circuit.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of bearing power indicating gauge, comprise shell, be positioned at power connector end 6, electric current pick device 1, current/voltage converter 3 and display device 5 on the shell, described power connector end 6 connects the power supply of described housing exterior, and is each several part power supply in the instrument; Described electric current pick device 1 comprises two links, is connected on two input ends of described current/voltage converter 3; Described display device 5 is connected the output terminal of described current/voltage converter 3, shows the voltage of described current/voltage converter output.
In bearing power indicating gauge described in the utility model, comprise that also the range that is positioned on the described shell and is connected on two input ends of described current/voltage sensor 3 is provided with port 2, described range is provided with port 2 and is used to connect the range that is positioned at outside the described housing circuit is set, and changes the input current value of described current/voltage converter 3.
In bearing power indicating gauge described in the utility model, described range is provided with circuit and comprises shunt resistance, two output terminals of described electric current pick device 1 are parallel with first resistance, wherein an end is connected to the negative input end of described current/voltage converter 3 by second resistance, and the other end directly is connected the positive input terminal and the ground connection of described current/voltage converter 3; Described range is provided with port 2 and is connected in parallel on described first resistance.
In bearing power indicating gauge described in the utility model, described power connector end 6 comprises positive source, power cathode and ground.
In bearing power indicating gauge described in the utility model, described electric current pick device 1 comprises current transformer.
In bearing power indicating gauge described in the utility model, described current/voltage converter 3 also is connected with quiescent voltage regulating circuit 7 and negative-feedback circuit 8, described quiescent voltage regulating circuit 7 is used to regulate the output voltage values of current/voltage converter 3 when zero input current, and described negative-feedback circuit 8 is used to regulate the enlargement factor of described current/voltage converter 3.
In bearing power indicating gauge described in the utility model, described quiescent voltage regulating circuit 7 comprises potentiometer, the two ends of described potentiometer are connected on two compensation ports of described current/voltage converter 3, and its center tap is connected on the negative voltage side of described power connector end 6.
In bearing power indicating gauge described in the utility model, described display device 5 comprises direct current pointer voltage table, also is in series with a current rectifying and wave filtering circuit 4 between the output of described current/voltage converter 3 and the described display device 5.
In bearing power indicating gauge described in the utility model, the frequency response of described electric current pick device 1 is roughly 50Hz
Implement bearing power indicating gauge of the present utility model, has following beneficial effect: owing to use mutual inductor as the electric current pick device, described bearing power indicating gauge need not be connected in the current supply circuit, again owing on its shell, have range that the connectivity port is set, the range setting can be changed easily during its work, and equipment failure and personal hidden danger can be do not brought because of second open circuit.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the utility model bearing power indicating gauge embodiment;
Fig. 2 is the circuit theory diagrams of the utility model bearing power indicating gauge embodiment;
Fig. 3 is the utility model bearing power indicating gauge embodiment side view;
Fig. 4 is the utility model bearing power indicating gauge embodiment vertical view.
Embodiment
As shown in Figure 1, in the utility model bearing power indicating gauge embodiment, described bearing power indicating gauge comprises that electric current pick device 1, range are provided with port 2, current/voltage converter 3, current rectifying and wave filtering circuit 4, display device 5, quiescent voltage regulating circuit 7, negative-feedback circuit 8, power connector end mouth 6 and shell.Wherein, described range is provided with port 2 not within described shell, but on shell, and the range that connection is positioned at outside the described shell is provided with the circuit (not shown); Current transformer 1 works in about 50Hz, electric current on its induction power frequency feed circuit that will measure, 50Hz, and the electric current of sensing is provided with network 2 by affiliated range delivers on two input ends of described current/voltage converter 3, after the output of described current/voltage converter 3 is DC voltage by described current rectifying and wave filtering circuit 4 rectifications, be connected to demonstration on the described display device 5.Described current/voltage converter 3 also comprises two compensation ports, be connected with quiescent voltage regulating circuit 7 on described two ports, this circuit is used to regulate the voltage output of its voltage output end when the input current of the current input terminal of described current/voltage converter 3 is zero, such adjusting is normally before each the measurement, be used for the indication of described display device 5 is adjusted to zero point, make indication more accurate, avoid because of the measuring error that moves or the operating point drift of the current/voltage converter 3 that reason such as environment temperature of living in causes brings; Described negative-feedback circuit 8 is connected between the output terminal and input end of described current/voltage converter 3, the enlargement factor of regulating described current/voltage converter 3; Described power connector end 6 is positioned on the described shell, is connected on the power supply that is positioned at outside this testing tool, comprises positive source, power cathode and ground, and above-mentioned end points all is connected to various piece within the described shell by connecting line, supplies with the various piece power supply.
Fig. 2 is the electrical schematic diagram in the present embodiment, in Fig. 2, electric current pick device 1 is a current transformer, its label is CT1, its two ends are connected the two ends of first resistance, the label of described first resistance is R1, two ends at first resistance, be connected with range port 2 is set, the label of this port in Fig. 2 is XP4, and simultaneously, an end of described first resistance is connected an end of second resistance, the label of described second resistance in Fig. 2 is R3, and the other end of described second resistance is connected on the negative input end of described current/voltage converter 3; The other end of described first resistance directly is connected the positive input terminal and the ground connection of described current/voltage converter 3; Above-mentioned range is provided with port 2 and is arranged on the present embodiment shell, be connected with range during work the circuit (not shown) is set, this range is provided with the outside that circuit is positioned at described shell, and with described first, second resistance, constitute divided circuit, it is different and different that the electric current that makes the input end that is input to current/voltage converter 3 is provided with circuit with the range of above-mentioned connection, thereby obtain comparatively moderate input current, be converted to comparatively moderate output voltage, reduce measuring error.On described current/voltage converter 3, also be connected with a quiescent voltage regulating circuit 7, this circuit comprises that one is connected in the potentiometer of two compensation ports of described current/voltage converter 3, in the drawings, the label of described potentiometer is RP1, and the two ends of this potentiometer are connected on described two compensation ports, and the center tap of this potentiometer is connected on the power cathode that described power connector end 6 introduced, in the present embodiment, this power cathode is-12V.Described current/voltage converter 3 also is connected with a negative-feedback circuit 8, be used to regulate the enlargement factor of described converter 3, this negative-feedback circuit 8 is connected between the negative input end and output terminal of described current/voltage converter 3, in Fig. 2, this negative-feedback circuit 8 comprises the resistance R 2 and the potentiometer RP2 of series connection; Among Fig. 2, the output of described current/voltage converter 3 becomes DC voltage by current rectifying and wave filtering circuit 4, is connected on the display device 5, drives display device 5, and display device 5 is flow index voltage table always in the present embodiment, and its label is XP2; Described current rectifying and wave filtering circuit 4 comprises that diode D1 and its positive pole are connected the negative pole of above-mentioned diode D1, the electrochemical capacitor of its minus earth.
Fig. 3 is the shell side view of the utility model embodiment, and Fig. 4 is its rear view, in Fig. 2, Fig. 3, can see that described power connector end mouth 6 and range are provided with the particular location of port 2.
Claims (9)
1. bearing power indicating gauge, it is characterized in that, comprise shell, be positioned at power connector end (6), electric current pick device (1), current/voltage converter (3) and display device (5) on the shell, described power connector end (6) connects the power supply of described housing exterior, and is each several part power supply in the instrument; Described electric current pick device (1) comprises two links, is connected on two input ends of described current/voltage converter (3); Described display device (5) is connected the output terminal of described current/voltage converter (3), shows the voltage of described current/voltage converter output.
2. bearing power indicating gauge according to claim 1, it is characterized in that, comprise that also the range that is positioned on the described shell and is connected on two input ends of described current/voltage sensor (3) is provided with port (2), described range is provided with port (2) and is used to connect the range that is positioned at outside the described housing circuit is set, and changes the input current value of described current/voltage converter (3).
3. bearing power indicating gauge according to claim 2, it is characterized in that, described range is provided with circuit and comprises shunt resistance, two output terminals of described electric current pick device (1) are parallel with first resistance, wherein an end is connected to the negative input end of described current/voltage converter (3) by second resistance, and the other end directly is connected the positive input terminal and the ground connection of described current/voltage converter (3); Described range is provided with port (2) and is connected in parallel on described first resistance.
4. bearing power indicating gauge according to claim 3 is characterized in that, described power connector end (6) comprises positive source, power cathode and ground.
5. bearing power indicating gauge according to claim 4 is characterized in that, described electric current pick device (1) comprises current transformer.
6. bearing power indicating gauge according to claim 5, it is characterized in that, described current/voltage converter (3) also is connected with quiescent voltage regulating circuit (7) and negative-feedback circuit (8), described quiescent voltage regulating circuit (7) is used to regulate the output voltage values of current/voltage converter (3) when zero input current, the enlargement factor that described negative-feedback circuit (8) is used to regulate described current/voltage converter (3).
7. bearing power indicating gauge according to claim 6, it is characterized in that, described quiescent voltage regulating circuit (7) comprises potentiometer, the two ends of described potentiometer are connected on two compensation ports of described current/voltage converter (3), and its center tap is connected on the negative voltage side of described power connector end (6).
8. bearing power indicating gauge according to claim 7, it is characterized in that, described display device (5) comprises direct current pointer voltage table, also is in series with a current rectifying and wave filtering circuit (4) between the output of described current/voltage converter (3) and the described display device (5).
9. according to each described bearing power indicating gauge of claim 1-8, it is characterized in that the frequency response of described electric current pick device (1) is roughly 50Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201190456U CN201017012Y (en) | 2007-03-19 | 2007-03-19 | Load power indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201190456U CN201017012Y (en) | 2007-03-19 | 2007-03-19 | Load power indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201017012Y true CN201017012Y (en) | 2008-02-06 |
Family
ID=39057507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201190456U Expired - Fee Related CN201017012Y (en) | 2007-03-19 | 2007-03-19 | Load power indicator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201017012Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778103A (en) * | 2012-07-23 | 2012-11-14 | 合肥美的荣事达电冰箱有限公司 | Method and device for detecting and displaying power of refrigerator and refrigerator with device |
| CN103917877A (en) * | 2011-10-31 | 2014-07-09 | 三菱电机株式会社 | Power measuring apparatus, power measuring system, and power measuring method |
| CN106707006A (en) * | 2017-01-23 | 2017-05-24 | 扬州海通电子科技有限公司 | Precision AC voltage sampling device |
-
2007
- 2007-03-19 CN CNU2007201190456U patent/CN201017012Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103917877A (en) * | 2011-10-31 | 2014-07-09 | 三菱电机株式会社 | Power measuring apparatus, power measuring system, and power measuring method |
| CN103917877B (en) * | 2011-10-31 | 2016-09-07 | 三菱电机株式会社 | Electric exploration device, electric exploration system and electric exploration method |
| CN102778103A (en) * | 2012-07-23 | 2012-11-14 | 合肥美的荣事达电冰箱有限公司 | Method and device for detecting and displaying power of refrigerator and refrigerator with device |
| CN106707006A (en) * | 2017-01-23 | 2017-05-24 | 扬州海通电子科技有限公司 | Precision AC voltage sampling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20150319 |
|
| EXPY | Termination of patent right or utility model |