CN202837372U - Voltage detection circuit - Google Patents
Voltage detection circuit Download PDFInfo
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- CN202837372U CN202837372U CN 201220494467 CN201220494467U CN202837372U CN 202837372 U CN202837372 U CN 202837372U CN 201220494467 CN201220494467 CN 201220494467 CN 201220494467 U CN201220494467 U CN 201220494467U CN 202837372 U CN202837372 U CN 202837372U
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Abstract
The utility model discloses a voltage detection circuit, which comprises an MCU, a resistor R1, a resistor R2 and a capacitor C1, wherein the MCU contains a detection program and outputs through an I/O, the resistor R1 and the resistor R2 carry out voltage division on output voltage, and the capacitor C1 filters and stabilizes the voltage division value; the resistor R1 and the resistor R2 are connected in series; a capacitor C2 is connected with the resistor R2 in parallel and then grounded; and one output terminal of the MCU is connected to a circuit between the resistor R1 and the resistor R2, and one terminal of the MCU is grounded. The voltage detection circuit provided by the utility model not only can detect the output voltage accurately, but also can diagnose by itself whether anomaly exists or not, thereby being capable of avoiding instability or potential safety hazards, which are caused by anomaly of the voltage detection circuit, of the overall system, and providing positive factors for the reliability of the voltage the voltage detection system. The voltage detection circuit has extremely strong practical value, and can be popularized and applied widely.
Description
Technical field
The utility model relates to a kind of voltage detecting circuit, specifically, relates to a kind ofly can either correctly detect output voltage, can diagnose voluntarily whether unusual voltage detecting circuit is arranged again.
Background technology
In the schemes such as some Switching Power Supplies, mu balanced circuit voltage detecting circuit is arranged substantially, whether the function of this circuit detects output voltage exactly unusual, and according to value of feedback ideal value near our needs is adjusted in output.Everybody often concentrates and pays close attention to the input overvoltage in these schemes of design, under-voltage, considering of the detection of overload etc. and protection and Voltage-output ripple, such as a kind of by rectification, voltage stabilizing, the over-voltage and over-current testing circuit that bleeder circuit forms, it mainly is the sample rate current to input, voltage signal detects, when the input sample electric current, be converted to voltage through resistance, after amplifying, operational amplifier makes comparisons with given reference voltage again, two surpass given reference voltage, then export a high level, otherwise then export a low level, when input sample voltage, through the resistance pressure limiting, make comparisons with given reference voltage after the current limliting, when exceeding given reference voltage, then export a high level, otherwise, then export a low level.Although; at present detection and the protection of overvoltage, under-voltage, overload etc. have been paid close attention to greatly; but the reliability of voltage detecting circuit itself also directly affects the security of its output quality and output voltage; voltage detecting circuit can make whole system unstable unusually; even can be with and serve other hidden danger; and at present, but seldom pay close attention to the reliability of voltage detecting circuit itself, have no the relevant report about the safety protection technique of voltage detecting circuit.
The utility model content
For the problems referred to above that prior art exists, the purpose of this utility model provides and a kind ofly can either correctly detect output voltage, and whether can diagnose voluntarily again has unusual voltage detecting circuit.
For realizing above-mentioned utility model purpose, the technical scheme that the utility model is taked is as follows:
A kind of voltage detecting circuit comprises: include trace routine and the MCU by I/O output, output voltage is carried out resistance R 1 and the resistance R 2 of dividing potential drop, partial pressure value is carried out the capacitor C 1 of filtering voltage regulation; 2 series connection of described resistance R 1 and resistance R, capacitor C 2 and resistance R 2 afterwards ground connection in parallel, the wherein lead-out terminal of MCU is connected on the circuit between resistance R 1 and the resistance R 2, the wherein terminal ground connection of MCU.
As a kind of preferred version, comprise the fault judging unit among the described MCU.
As further preferred version, comprise also among the described MCU that circuit stops the unit, and described circuit termination unit is electrically connected with the fault judging unit.
The course of work of the present utility model is as follows:
After described voltage detecting circuit brings into operation, MCU will read through the feedback voltage V after resistance R 1 and resistance R 2 dividing potential drops, and then MCU will judge that the gained feedback voltage is whether in Vout1*R2/ (R1+R2)≤V≤Vout2*R2/ (R1+R2) and Vmin+1≤V≤Vmax-1 scope; If the V value in Vout1*R2/ (R1+R2)≤V≤Vout2*R2/ (R1+R2) and Vmin+1≤V≤Vmax-1 scope, then finishes after the normal operation of voltage detecting circuit; Otherwise, then drawing this voltage detecting circuit and break down, the work of MCU final voltage testing circuit finishes after fault handling.
Compared with prior art, the voltage detecting circuit that the utility model provides, not only can correctly detect output voltage, whether can also diagnose voluntarily has unusually, can avoid unusually causing the unstable or potential safety hazard of whole system because of voltage detecting circuit, for the reliability of voltage detecting system provides positive factor, have extremely strong practical value, but wide popularization and application.
Description of drawings
Fig. 1 is the structural representation of a kind of voltage detecting circuit of providing of the utility model;
Fig. 2 is the workflow schematic diagram of the voltage detecting circuit that provides of the utility model;
Fig. 3 is the workflow schematic diagram of the voltage detecting circuit that provides of embodiment 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is illustrated in further detail:
As shown in Figure 1: a kind of voltage detecting circuit that the utility model provides comprises: include trace routine and the MCU by I/O output, output voltage is carried out resistance R 1 and the resistance R 2 of dividing potential drop, partial pressure value is carried out the capacitor C 1 of filtering voltage regulation; 2 series connection of described resistance R 1 and resistance R, capacitor C 2 and resistance R 2 afterwards ground connection in parallel, the wherein lead-out terminal of MCU is connected on the circuit between resistance R 1 and the resistance R 2, the wherein terminal ground connection of MCU.
As a kind of preferred version, comprise among the described MCU that fault judging unit and circuit stop the unit, and described circuit termination unit is electrically connected with the fault judging unit.
As shown in Figure 2, the course of work of the present utility model is as follows:
After described voltage detecting circuit brings into operation, MCU will read through the feedback voltage V after resistance R 1 and resistance R 2 dividing potential drops, and then MCU will judge that the gained feedback voltage is whether in Vout1*R2/ (R1+R2)≤V≤Vout2*R2/ (R1+R2) and Vmin+1≤V≤Vmax-1 scope; If the V value in Vout1*R2/ (R1+R2)≤V≤Vout2*R2/ (R1+R2) and Vmin+1≤V≤Vmax-1 scope, then finishes after the normal operation of voltage detecting circuit; Otherwise, then drawing this voltage detecting circuit and break down, the work of MCU final voltage testing circuit finishes after fault handling.
Wherein: the account form of feedback voltage V is V=Vout*R2/ (R1+R2); The fluctuation range of described feedback voltage V is Vout1*R2/ (R1+R2)≤V≤Vout2*R2/ (R1+R2), wherein, Vout1 and Vout2 are respectively minimum value and the maximal value that output voltage V out allows fluctuation, Vmin+1≤Vout1*R2/ (R1+R2), Vmax-1 〉=Vout2*R2/ (R1+R2).
According to the characteristic of MCU, the input voltage range that draws its I/O is (Vmin-Vmax), selects R1, the R2 of suitable resistance, makes the feedback voltage value satisfy Vmin+1≤V≤Vmax-1, also can not damage MCU to guarantee as much as possible this circuit under abnormal conditions.
Embodiment 1
Suppose output voltage V out=100V, it permits scope range of the fluctuation of voltage is ± 5%, then Vout1=95V; Vout2=105V.If the I/O pin input voltage range of selected MCU is 0 ~ 5V, also namely: Vmin=0V; Vmax=5V.According to foregoing as can be known, the minimum value of feedback voltage V=Vout*R2/ (R1+R2) is Vout1*R2/ (R1+R2)=95*R2/ (R1+R2); The maximal value of feedback voltage V=Vout*R2/ (R1+R2) is Vout2*R2/ (R1+R2)=105*R2/ (R1+R2); And feedback voltage V=Vout*R2/ (R1+R2) satisfies this condition Vmin+1≤V≤Vmax-1 again, and digital substitution formula can be drawn 1≤V≤4, thereby the value of releasing R1, R2 can be R1=30K, R2=1K.In the scope that output voltage is permitted, the fluctuation range of feedback voltage is 3.06 ~ 3.39V like this.Its course of work as shown in Figure 3.
In sum as seen: the voltage detecting circuit that the utility model provides, not only can correctly detect output voltage, whether can also diagnose voluntarily has unusually, can avoid unusually causing the unstable or potential safety hazard of whole system because of voltage detecting circuit, for the reliability of voltage detecting system provides positive factor, have extremely strong practical value, but wide popularization and application.
Be necessary at last in this explanation to be: foregoing only is used for the technical solution of the utility model is described in further detail; can not be interpreted as the restriction to the utility model protection domain, some nonessential improvement and adjustment that those skilled in the art makes according to foregoing of the present utility model all belong to protection domain of the present utility model.
Claims (3)
1. a voltage detecting circuit is characterized in that, comprising: include trace routine and the MCU by I/O output, output voltage is carried out resistance R 1 and the resistance R 2 of dividing potential drop, partial pressure value is carried out the capacitor C 1 of filtering voltage regulation; 2 series connection of described resistance R 1 and resistance R, capacitor C 2 and resistance R 2 afterwards ground connection in parallel, the wherein lead-out terminal of MCU is connected on the circuit between resistance R 1 and the resistance R 2, the wherein terminal ground connection of MCU.
2. voltage detecting circuit according to claim 1 is characterized in that: comprise the fault judging unit among the described MCU.
3. voltage detecting circuit according to claim 2 is characterized in that: comprise also among the described MCU that circuit stops the unit, and described circuit termination unit is electrically connected with the fault judging unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220494467 CN202837372U (en) | 2012-09-25 | 2012-09-25 | Voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220494467 CN202837372U (en) | 2012-09-25 | 2012-09-25 | Voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202837372U true CN202837372U (en) | 2013-03-27 |
Family
ID=47949051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220494467 Expired - Fee Related CN202837372U (en) | 2012-09-25 | 2012-09-25 | Voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202837372U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841230A (en) * | 2012-09-25 | 2012-12-26 | 上海微频莱机电科技有限公司 | Safety protection structure of voltage detection circuit |
| CN106291167A (en) * | 2016-07-26 | 2017-01-04 | 北京安控科技股份有限公司 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
-
2012
- 2012-09-25 CN CN 201220494467 patent/CN202837372U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841230A (en) * | 2012-09-25 | 2012-12-26 | 上海微频莱机电科技有限公司 | Safety protection structure of voltage detection circuit |
| CN106291167A (en) * | 2016-07-26 | 2017-01-04 | 北京安控科技股份有限公司 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
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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: 20130327 Termination date: 20160925 |
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| CF01 | Termination of patent right due to non-payment of annual fee |