CN201163288Y - Power supply voltage detecting circuit - Google Patents
Power supply voltage detecting circuit Download PDFInfo
- Publication number
- CN201163288Y CN201163288Y CN 200720170863 CN200720170863U CN201163288Y CN 201163288 Y CN201163288 Y CN 201163288Y CN 200720170863 CN200720170863 CN 200720170863 CN 200720170863 U CN200720170863 U CN 200720170863U CN 201163288 Y CN201163288 Y CN 201163288Y
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- diode
- supply voltage
- detecting circuit
- model
- voltage detecting
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Abstract
The utility model relates to a supply voltage detecting circuit comprising a first diode and a resistor. The anode of the first diode is connected to the input/output interface of a singlechip, the cathode of the first diode is connected to the analog-digital conversion interface of the singlechip, one end of the resistor is connected to the analog-digital conversion interface of the singlechip, and the other end of the resistor is earthed. According to the supply voltage detecting circuit provided by the utility model, when a supply voltage changes, the supply voltage can be directly measured by the analog-digital interface of the singlechip without applying a voltage stabilizing circuit. The supply voltage detecting circuit has low cost; one diode and one resistor can be used when the accuracy is not high; two diodes and one resistor can be used when the accuracy is higher. The supply voltage detecting circuit can save current; any voltage stabilizing circuit needs consuming current for a long time, while the supply voltage detecting circuit consumes current only during the measurement. The proposal has high measuring accuracy, and specific accuracy depends on the analog-digital interface of the singlechip.
Description
Technical field
The utility model relates to the voltage detecting technology, more particularly, relates to a kind of voltage detection circuit.
Background technology
Battery or variable power supply directly in the circuit to single-chip microcomputer power supply, for whether the work of monitoring power supply is normal, need to measure in real time power source voltage.But during mains voltage variations, can't directly pass through the A/D mouth measuring voltage of single-chip microcomputer.The general voltage of stablizing IC that adopts is measured power source voltage by electric resistance partial pressure again.As power supply is passed through a three-terminal voltage-stabilizing pipe voltage stabilizing, by two electric resistance partial pressures, measure power source voltage by the A/D mouth of single-chip microcomputer then again.
This mode needs the extra mu balanced circuit that increases, and cost is higher, and needs long-term current sinking.
The utility model content
The technical problems to be solved in the utility model is, additionally increases the defective of mu balanced circuit at the need of prior art, and a kind of voltage detection circuit is provided.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of voltage detection circuit, comprise first diode and a resistance, the positive pole of described first diode is connected to the I/O port of single-chip microcomputer, negative pole is connected to the mould/number conversion mouth of single-chip microcomputer, resistance one end is connected to the mould/number conversion mouth of single-chip microcomputer, other end ground connection.
In voltage detection circuit described in the utility model, also comprise second diode, be connected between the negative pole of described first diode and the mould of the single-chip microcomputer/number conversion mouth, its positive pole is connected to the negative pole of first diode, and negative pole is connected to the A/D of single-chip microcomputer.
In voltage detection circuit described in the utility model, the described first diode model is 1N4148.
In voltage detection circuit described in the utility model, described resistance is 4.7K Ω.
In voltage detection circuit described in the utility model, the described second diode model is 1N4148.
Implement voltage detection circuit of the present utility model, have following beneficial effect: when power source voltage changes, can directly measure power source voltage, need not add mu balanced circuit with the A/D mouth of single-chip microcomputer; Cost is low, when precision is not high, and can be only with a diode and a resistance, when precision is higher, with two diodes and a resistance; Save electric current, any mu balanced circuit is all wanted long-term current sinking, and the utility model current sinking when measurement only; This scheme measuring accuracy height, concrete precision is by Chip Microcomputer A/D decision.
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 first embodiment of the utility model voltage detection circuit;
Fig. 2 is second embodiment of the utility model voltage detection circuit.
Embodiment
As shown in Figure 1, when accuracy requirement is not high, in the utility model voltage detection circuit, comprise diode D1 and resistance R.The D1 model is 1N4148, and the resistance of R is 4.7K Ω.
The positive pole of diode D1 is connected to the I/O mouth of single-chip microcomputer, and negative pole is connected to the A/D mouth of single-chip microcomputer, and an end of resistance R is connected to the A/D mouth of single-chip microcomputer, the other end ground connection of resistance R.
When measuring supply voltage, the I/O mouth of single-chip microcomputer output high level, electric current flow through diode D1 and resistance R arrive ground then.Voltage V with A/D mouth measuring resistance R
R, corresponding A/D value is A
RBecause of V
CCCorresponding A/D value is FF (scale-of-two), and the voltage of diode is reduced to 0.7V, then V
CC/ V
R=FF/A
R, V
R=V
CC-0.7V.So V of this moment
CC=FF*0.7/ (FF-A
R).
As shown in Figure 2, when accuracy requirement is higher, in the utility model voltage detection circuit, comprise diode D1, diode D2 and resistance R.D1 and D2 model are 1N4148, and the resistance of R is 4.7K Ω.
The positive pole of diode D1 is connected to the I/O mouth of single-chip microcomputer, and the negative pole of diode D1 is connected to the positive pole of diode D2, and the negative pole of diode D2 is connected to the A/D mouth of single-chip microcomputer, and an end of resistance R is connected to the A/D mouth of single-chip microcomputer, the other end ground connection of resistance R.
When measuring supply voltage, the I/O mouth of single-chip microcomputer output high level, electric current flow through diode D1, diode D2 and resistance R arrive ground then.Voltage V with A/D mouth measuring resistance R
R, corresponding A/D value is A
RBecause of V
CCCorresponding A/D value is FF (scale-of-two), and the voltage of two diodes is reduced to 2*0.7V, then V
CC/ V
R=FF/A
R, V
R=V
CC-1.4V.So V of this moment
CC=FF*1.4/ (FF-A
R).
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (5)
1, a kind of voltage detection circuit, it is characterized in that, comprise first diode and a resistance, the positive pole of described first diode is connected to the I/O port of single-chip microcomputer, negative pole is connected to the mould/number conversion mouth of single-chip microcomputer, resistance one end is connected to the mould/number conversion mouth of single-chip microcomputer, other end ground connection.
2, voltage detection circuit according to claim 1, it is characterized in that, also comprise second diode, be connected between the negative pole of described first diode and the mould of the single-chip microcomputer/number conversion mouth, its positive pole is connected to the negative pole of first diode, and negative pole is connected to the A/D of single-chip microcomputer.
3, voltage detection circuit according to claim 1 is characterized in that, the described first diode model is 1N4148.
4, voltage detection circuit according to claim 1 is characterized in that, described resistance is 4.7K Ω.
5, voltage detection circuit according to claim 2 is characterized in that, the described second diode model is 1N4148.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720170863 CN201163288Y (en) | 2007-11-16 | 2007-11-16 | Power supply voltage detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720170863 CN201163288Y (en) | 2007-11-16 | 2007-11-16 | Power supply voltage detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201163288Y true CN201163288Y (en) | 2008-12-10 |
Family
ID=40184223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200720170863 Expired - Fee Related CN201163288Y (en) | 2007-11-16 | 2007-11-16 | Power supply voltage detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201163288Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
| CN105044603A (en) * | 2015-06-05 | 2015-11-11 | 福州瑞芯微电子有限公司 | Low-power low-cost lithium battery voltage detection circuit and method |
| CN106646241A (en) * | 2015-11-04 | 2017-05-10 | 海洋王（东莞）照明科技有限公司 | Voltage detection circuit and voltage measurement method |
| CN113109620A (en) * | 2021-03-03 | 2021-07-13 | 昆明理工大学 | Power measurement circuit of high-power radio frequency signal |
-
2007
- 2007-11-16 CN CN 200720170863 patent/CN201163288Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
| CN105044603A (en) * | 2015-06-05 | 2015-11-11 | 福州瑞芯微电子有限公司 | Low-power low-cost lithium battery voltage detection circuit and method |
| CN106646241A (en) * | 2015-11-04 | 2017-05-10 | 海洋王（东莞）照明科技有限公司 | Voltage detection circuit and voltage measurement method |
| CN113109620A (en) * | 2021-03-03 | 2021-07-13 | 昆明理工大学 | Power measurement circuit of high-power radio frequency signal |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081210 Termination date: 20161116 |