CN201163288Y - Power supply voltage detecting circuit - Google Patents

Power supply voltage detecting circuit Download PDF

Info

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
Authority
CN
China
Prior art keywords
diode
supply voltage
detecting circuit
model
voltage detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 200720170863
Other languages
Chinese (zh)
Inventor
钟鸣
刘建伟
蒋洪波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen H&T Intelligent Control Co Ltd
Original Assignee
Shenzhen H&T Intelligent Control Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen H&T Intelligent Control Co Ltd filed Critical Shenzhen H&T Intelligent Control Co Ltd
Priority to CN 200720170863 priority Critical patent/CN201163288Y/en
Application granted granted Critical
Publication of CN201163288Y publication Critical patent/CN201163288Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Measurement Of Current Or Voltage (AREA)

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

Voltage detection circuit
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.
CN 200720170863 2007-11-16 2007-11-16 Power supply voltage detecting circuit Expired - Fee Related CN201163288Y (en)

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 (5)

* Cited by examiner, † Cited by third party
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
CN110940929A (en) * 2019-12-16 2020-03-31 华帝股份有限公司 Detection circuit and detection method for power supply voltage
CN113109620A (en) * 2021-03-03 2021-07-13 昆明理工大学 Power measurement circuit of high-power radio frequency signal

Cited By (5)

* Cited by examiner, † Cited by third party
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
CN110940929A (en) * 2019-12-16 2020-03-31 华帝股份有限公司 Detection circuit and detection method for power supply voltage
CN113109620A (en) * 2021-03-03 2021-07-13 昆明理工大学 Power measurement circuit of high-power radio frequency signal

Similar Documents

Publication Publication Date Title
CN109696637B (en) Method for monitoring capacity of lithium disposable battery
CN201163288Y (en) Power supply voltage detecting circuit
CN201926735U (en) Simple diode and triode performance tester
CN104062507A (en) Battery internal resistance measuring instrument
CN105699904A (en) Battery voltage detecting circuit and method
CN204964077U (en) Pressure drag formula pressure sensor pressure detection circuit
CN204679622U (en) With the three-phase intelligent electric-energy meter communication interface load capacity proving installation of communication module
CN109802152B (en) Application of circuit structure for monitoring capacity of lithium disposable battery
CN203705526U (en) Voltage polarity judgment circuit and system
CN204086510U (en) Demagnetization detection control module and demagnetization detection system
CN201607522U (en) Device for detecting electric quantity of dry battery using voltage method
CN104655916A (en) Alternating-current voltage effective value measuring device and method
CN206038872U (en) Battery voltage supervisory circuit
CN201215570Y (en) Voltage detecting circuit for battery
CN206657052U (en) A kind of low-power consumption lithium battery voltage detects circuit
CN203232091U (en) Range automatic switching voltage meter
CN202720321U (en) Voltage detection circuit of high-string number lithium battery pack and battery pack protection circuit applying the same
CN202948336U (en) Fluid position display controller
CN202383264U (en) Battery voltage detection circuit and device
CN205449233U (en) Turbine flowmeter calibration power supply automatic identification circuit
CN203455403U (en) Battery voltage detection circuit based on Zener diode
CN204206279U (en) A kind of standby power consumption of mobile phone test circuit
CN209400676U (en) A kind of battery voltage measurement circuit under the scene applied to low-power consumption
CN203798884U (en) Novel voltage divider
CN208672232U (en) A kind of full automatic biochemical apparatus apparatus for testing weeping

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