CN203299236U - Commutable constant-current source - Google Patents
Commutable constant-current source Download PDFInfo
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- CN203299236U CN203299236U CN2012207105458U CN201220710545U CN203299236U CN 203299236 U CN203299236 U CN 203299236U CN 2012207105458 U CN2012207105458 U CN 2012207105458U CN 201220710545 U CN201220710545 U CN 201220710545U CN 203299236 U CN203299236 U CN 203299236U
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Abstract
A commutable constant-current source comprises a power supply. The commutable constant-current source is characterized in that the commutable constant-current source also comprises a first connecting end which is connected with a resistor to be measured and comprises a first contact and a second contact which are connected with two ends of the resistor to be measured, and a second connecting end which is connected with the power supply and comprises a third contact and a fourth contact which are connected with the positive and negative poles of the power supply respectively; and a commuting device is arranged between the first connecting end and the second connecting end. By means of the above manner, the flow direction of current can be in the following three states: 1, the current flows from the third contact to the first contact, and flows to the second contact through the resistor to be measured, and then, flows to the fourth contact; 2, the current flows from the third contact to the fourth contact; and 3, the current flows from the third contact to the second contact, and flows to the first contact through the resistor to be measured, and then, flows to the fourth contact. According to the commutable constant-current source of the utility model, through commutable measurement of a measurement end, higher measurement accuracy can be realized.
Description
Technical field
The utility model relates to a kind of constant current source, specifically, relates to a kind of constant current source capable of reversing.
Background technology
Constant current source is requisite equipment in electronic measurement circuit.Be widely used in resistance measurement.Particularly in the measuring circuit of thermal resistance, be used widely in the temperature survey field.
In platinum resistance thermometer sensor, thermometric circuit, usually adopt constant current source to pass through platinum resistance thermometer sensor,, the mode of measuring the voltage on platinum resistance thermometer sensor, obtains temperature results.For guaranteeing measuring accuracy, also need electric current reverse, then measure the primary voltage value, twice measurement result addition, can offset spuious thermoelectrical potential.The routine measurement wiring diagram is seen Fig. 1.In Fig. 1, constant current source 11 comprises power supply 111, and its measuring junction is connected on testing resistance 13, and this measuring junction can exchange and be connected on this testing resistance 13 as required. digital voltmeter 12 also is connected on testing resistance 13 so that the voltage on measurement thermal resistance this moment.
The utility model content
Yet in actual mechanical process, electric current commutates, and need to first pull down the lead-in wire of measuring junction, switch, then anchor leg.There are like this two hidden danger:
1 load cuts in and out, and is very unstable, impacts electric logging equipment, reduces serviceable life, even damage equipment.
2 cause the unstable of constant current source self.
For the utility model people that deals with problems proposes following technical scheme,
a kind of constant current source capable of reversing, comprise power supply, it is characterized in that, also comprise the first link that connects testing resistance, this first link comprises the first contact and the second contact that connects the testing resistance two ends, the second link that connects described power supply, this second link comprises the 3rd contact and the 4th contact that connects respectively this power positive cathode, be provided with reversing arrangement between described the first link and the second link, making current direction is three kinds of situations: one, electric current flows to the first contact from the 3rd contact, flow to the second contact through testing resistance, and then flow to the 4th electric shock, two, electric current flows to the 4th contact from the 3rd contact, three, electric current flows to the second contact from the 3rd contact, through testing resistance, flows to the first contact, and then flows to the 4th contact.Measure and can obtain better measuring accuracy as mentioned above by the exchange of measuring junction.
best, described reversing arrangement comprises first lever arm corresponding with the first contact and the second contact and the second lever arm, three lever arm corresponding with the 3rd place's point and the 4th contact and the 4th lever arm, described the first lever arm and the 3rd lever arm short circuit, the second lever arm and the 4th lever arm short circuit, this reversing arrangement also comprises that the 5th contact and the 6th contact and the 3rd lever arm are arranged between the 3rd contact and the 5th contact in addition, the 4th lever arm is arranged between the 4th contact and the 6th contact, described the 3rd contact and the 6th contact short, described the 4th contact and the 5th contact short, simultaneously the first lever arm be connected lever arm and can connect.
Best, described lever arm is manual or aut.eq..
Best, this first lever arm be connected the connection of lever arm and realize by two contacts of common or short circuit.
Description of drawings
Fig. 1 is the service condition sketch of constant current source in prior art;
Fig. 2-4 are three kinds of working condition sketches of constant current source of the present utility model;
Fig. 5 is the schematic diagram of constant current source capable of reversing of the present utility model.
Embodiment
Fig. 1 is that the working condition of the constant current source of prior art was described in the above.
Fig. 5 shows constant current source 21 of the present utility model, comprise housing 213 and power supply 211, also comprise the first link that connects testing resistance 13, this first link comprises the first contact 214 and the second contact 215 that connects the testing resistance two ends, the second link that connects described power supply 211, this second link comprises the 3rd contact 212 and the 4th contact 216 that connects respectively this power positive cathode, be provided with reversing arrangement (not providing Reference numeral in accompanying drawing) between described the first link and the second link, making current direction is three kinds of situations: one, electric current flows to the first contact 214 from the 3rd contact 212, flow to the B end through testing resistance from the A end and flow to again the second contact 215, and then flow to the 4th and get an electric shock 216, two, electric current flows to the 4th contact 216 from the 3rd contact 212, three, electric current flows to the second contact 215 from the 3rd contact 212, flows to the A end through testing resistance from the B end, then flows to the first contact 214, and then flow to the 4th contact 216.
Constant current source capable of reversing increases two K switch 1 and the K2 of putting of two double-poles on the original basis as can see from Figure 2, simultaneously with two stiff end 1 and 2 short circuits of putting K switch 1 of double-pole, and two stiff end 1 and 4 short circuits, stiff end 2 and 3 short circuits of putting K switch 2 of double-pole.Simultaneously, can see, the two movable ends of putting the K1 of switch of double-pole be connected with double-pole accordingly and are put K switch 2 conductors connections (short circuit).
During work, when the two movable ends of putting switch k1 of double-pole are placed in stiff end 3-4 one side, electric current flows through thermal resistance from A-B.See Fig. 2.
When the needs electric current commutates, first the two movable ends of putting switch k1 of double-pole are placed in 1-2 one side, the continuous current short circuit, in thermal resistance, no current flows through.See Fig. 3.The movable end of double-point double-throw switch K2 is placed in stiff end 3-4 one side again, finally two that put the K switch 1 or movable ends of double-pole is placed in stiff end 3-4 one side, electric current flows through thermal resistance from B-A.See Fig. 4.In said process, constant current source and digital voltmeter are under stable service load or short-circuit condition all the time, and the safety of Reliable guarantee equipment and Measurement sensibility, can find out the current flowing situation from Fig. 2-4.
Foregoing description is only used for illustrating the utility model rather than is used for limiting protection domain of the present utility model.Those skilled in the art easily draw multiple improvement and distortion from above-mentioned instruction, only otherwise exceed the protection domain of claim.
Claims (4)
1. constant current source capable of reversing, comprise power supply, it is characterized in that, also comprise the first link that connects testing resistance, this first link comprises the first contact and the second contact that connects the testing resistance two ends, the second link that connects described power supply, this second link comprises the 3rd contact and the 4th contact that connects respectively this power positive cathode, be provided with reversing arrangement between described the first link and the second link, making current direction is three kinds of situations: one, electric current flows to the first contact from the 3rd contact, flow to the second contact through testing resistance, and then flow to the 4th electric shock, two, electric current flows to the 4th contact from the 3rd contact, three, electric current flows to the second contact from the 3rd contact, through testing resistance, flows to the first contact, and then flows to the 4th contact.
2. constant current source capable of reversing according to claim 1, it is characterized in that, described reversing arrangement comprises first lever arm corresponding with the first contact and the second contact and the second lever arm, three lever arm corresponding with the 3rd place's point and the 4th contact and the 4th lever arm, described the first lever arm and the 3rd lever arm short circuit, the second lever arm and the 4th lever arm short circuit, this reversing arrangement also comprises that the 5th contact and the 6th contact and the 3rd lever arm are arranged between the 3rd contact and the 5th contact in addition, the 4th lever arm is arranged between the 4th contact and the 6th contact, described the 3rd contact and the 6th contact short, described the 4th contact and the 5th contact short, simultaneously the first lever arm be connected lever arm and can connect.
3. constant current source capable of reversing according to claim 2, is characterized in that, described lever arm is manual or aut.eq..
4. constant current source capable of reversing according to claim 2, is characterized in that, this first lever arm be connected the connection of lever arm and realize by two contacts of common or short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207105458U CN203299236U (en) | 2012-12-20 | 2012-12-20 | Commutable constant-current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207105458U CN203299236U (en) | 2012-12-20 | 2012-12-20 | Commutable constant-current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203299236U true CN203299236U (en) | 2013-11-20 |
Family
ID=49575241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207105458U Expired - Fee Related CN203299236U (en) | 2012-12-20 | 2012-12-20 | Commutable constant-current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203299236U (en) |
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2012
- 2012-12-20 CN CN2012207105458U patent/CN203299236U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20131220 |