CN204740286U - Low -power consumption instrument detects circuit of power supply electric current by oneself - Google Patents
Low -power consumption instrument detects circuit of power supply electric current by oneself Download PDFInfo
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- CN204740286U CN204740286U CN201520473563.2U CN201520473563U CN204740286U CN 204740286 U CN204740286 U CN 204740286U CN 201520473563 U CN201520473563 U CN 201520473563U CN 204740286 U CN204740286 U CN 204740286U
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Abstract
The utility model relates to a low -power consumption instrument detects circuit of power supply electric current by oneself, include the battery for the power supply of low -power consumption instrument, the positive pole of battery is connected to the V+ end of low -power consumption instrument internal circuit, is connected to the V - end of low -power consumption instrument internal circuit behind the first resistance of negative pole connection of battery, low -power consumption instrument internal circuit is including AD converting circuit, its characterized in that: still include the inverting amplifier that second resistance, third resistance and operational amplifier constitute, wherein the first end of second resistance is connected with the first end of first resistance, and the second end of second resistance is connected with the first end of third resistance, and the second of third resistance is held and is connected with operational amplifier's output, and the second of second resistance is held still to hold with operational amplifier's inverting input and is connected, operational amplifier's non inverting input termination ground, operational amplifier's output and the inside AD converting circuit input of low -power consumption instrument are connected. Compared with the prior art, the utility model provides a low -power consumption instrument that enables the circuit detects its power supply electric current by oneself.
Description
Technical field
The utility model relates to the circuit that a kind of low-power consumption instrument detects supply current voluntarily.
Background technology
Low-power consumption instrument is usually by the powered battery of gauge internal, very large to the measurement meaning of battery powered life prediction and supply current.General instrument does not all have supply current monitoring function.
Utility model content
Technical problem to be solved in the utility model is the circuit that a kind of low-power consumption instrument detects supply current voluntarily, and this circuit can be measured the supply current of low-power consumption gauge internal supplying cell.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of low-power consumption instrument detects the circuit of supply current voluntarily, comprise to the battery of low-power consumption instrument power supply, the positive pole of battery is connected to the V+ end of low-power consumption gauge internal circuit, the negative pole of battery connects the first end of the first resistance, second end of the first resistance is connected to the V-end of low-power consumption gauge internal circuit, V-end is the common port of low-power consumption instrument, and the V-of low-power consumption gauge internal circuit holds ground connection; Low-power consumption gauge internal circuit includes A/D change-over circuit, it is characterized in that: the inverting amplifier also comprising the second resistance, the 3rd resistance and operational amplifier composition, wherein the first end of the second resistance is connected with the first end of the first resistance, second end of the second resistance is connected with the first end of the 3rd resistance, second end of the 3rd resistance is connected with the output terminal of operational amplifier, second end of the second resistance is also connected with the inverting input of operational amplifier, the in-phase input end ground connection of operational amplifier; The output terminal of operational amplifier is connected with the input end of low-power consumption gauge internal A/D change-over circuit.
Preferably, the first resistance R1 is chosen as: time maximum to the supply current Is of low-power consumption gauge internal circuit, pressure drop V on the first resistance R1
r1be no more than 0.6V.
Compared with prior art, the utility model has the advantage of: by arranging a see-saw circuit, then the voltage after see-saw circuit is measured, this voltage can not be negative value, thus can be included A/D change-over circuit by low-power consumption gauge internal circuit to measure, the circuit that therefore the utility model provides can make low-power consumption instrument detect its supply current voluntarily.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams that in the utility model embodiment, low-power consumption instrument detects supply current voluntarily.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
Low-power consumption instrument as shown in Figure 1 detects the circuit of supply current voluntarily, comprise to the battery of low-power consumption instrument power supply, the positive pole of battery is connected to the V+ end of low-power consumption gauge internal circuit, the negative pole of battery connects the first end of the first resistance R1, second end of the first resistance R1 is connected to the V-end of low-power consumption gauge internal circuit, and the V-of low-power consumption gauge internal circuit holds ground connection, low-power consumption gauge internal circuit includes A/D change-over circuit, the circuit that this low-power consumption instrument detects supply current voluntarily also comprises the second resistance R2, the inverting amplifier that 3rd resistance R3 and operational amplifier U1 forms, wherein the first end of the second resistance R2 is connected with the first end of the first resistance R1, second end of the second resistance R2 is connected with the first end of the 3rd resistance R3, second end of the 3rd resistance R3 is connected with the output terminal of operational amplifier U1, second end of the second resistance R2 is also connected with the inverting input of operational amplifier U1, the in-phase input end ground connection of operational amplifier U1, the output terminal of operational amplifier is connected with the input end of low-power consumption gauge internal A/D change-over circuit.
The power supply of battery to low-power consumption instrument is such: electric current I s is held by battery "+" and enters low-power consumption instrument through terminals V+, and "-" end flowing to battery through the first resistance R1 by terminals V-forms loop.Pressure drop V is formed at the first resistance R1
r1, the first resistance R1 is chosen as: when electric current I s is maximum, V
r1be no more than 0.6V, the present embodiment selects 0.6V.Obviously, to operational amplifier U1, as Is=0, V
r1=0; When electric current I s is maximum, V
r1=-0.6V (setting value).And operational amplifier U1 is battery-powered, operational amplifier output terminal voltage
obvious operational amplifier output terminal voltage V
0dynamic range exist
between, can not be negative value, thus can be measured by the A/D change-over circuit in low-power consumption instrument.The inverting amplifier of usual Power supply, when input voltage is at 0 ~-0.6V, can distortionless anti-phase amplification.
Claims (2)
1. a low-power consumption instrument detects the circuit of supply current voluntarily, comprise to the battery of low-power consumption instrument power supply, the positive pole of battery is connected to the V+ end of low-power consumption gauge internal circuit, the negative pole of battery connects the first end of the first resistance, second end of the first resistance is connected to the V-end of low-power consumption gauge internal circuit, and the V-of low-power consumption gauge internal circuit holds ground connection; Low-power consumption gauge internal circuit includes A/D change-over circuit, it is characterized in that: the inverting amplifier also comprising the second resistance, the 3rd resistance and operational amplifier composition, wherein the first end of the second resistance is connected with the first end of the first resistance, second end of the second resistance is connected with the first end of the 3rd resistance, second end of the 3rd resistance is connected with the output terminal of operational amplifier, second end of the second resistance is also connected with the inverting input of operational amplifier, the in-phase input end ground connection of operational amplifier; The output terminal of operational amplifier is connected with the input end of low-power consumption gauge internal A/D change-over circuit.
2. low-power consumption instrument according to claim 1 detects the circuit of supply current voluntarily, it is characterized in that: the first resistance R1 is chosen as: time maximum to the supply current Is of low-power consumption gauge internal circuit, pressure drop V on the first resistance R1
r1be no more than 0.6V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520473563.2U CN204740286U (en) | 2015-06-30 | 2015-06-30 | Low -power consumption instrument detects circuit of power supply electric current by oneself |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520473563.2U CN204740286U (en) | 2015-06-30 | 2015-06-30 | Low -power consumption instrument detects circuit of power supply electric current by oneself |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204740286U true CN204740286U (en) | 2015-11-04 |
Family
ID=54422017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520473563.2U Active CN204740286U (en) | 2015-06-30 | 2015-06-30 | Low -power consumption instrument detects circuit of power supply electric current by oneself |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204740286U (en) |
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2015
- 2015-06-30 CN CN201520473563.2U patent/CN204740286U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200828 Address after: 315181 Lin village, Haishu District, Ningbo, Zhejiang Patentee after: NINGBO DONGHAI Group Corp. Address before: 315181, Zhejiang, Ningbo province Yinzhou District Heng Lin Village Patentee before: NINGBO DONGHAI INSTRUMENT WATERWAY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: NINGBO DONGHAI INSTRUMENT WATERWAY Co.,Ltd. Assignor: NINGBO DONGHAI Group Corp. Contract record no.: X2021330000081 Denomination of utility model: A circuit for self detecting power supply current of low power consumption instrument Granted publication date: 20151104 License type: Exclusive License Record date: 20210819 |
|
| EE01 | Entry into force of recordation of patent licensing contract |