CN201724975U - Brown out detection circuit of electric meter system - Google Patents
Brown out detection circuit of electric meter system Download PDFInfo
- Publication number
- CN201724975U CN201724975U CN 201020273441 CN201020273441U CN201724975U CN 201724975 U CN201724975 U CN 201724975U CN 201020273441 CN201020273441 CN 201020273441 CN 201020273441 U CN201020273441 U CN 201020273441U CN 201724975 U CN201724975 U CN 201724975U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power
- voltage
- power supply
- detection circuit
- 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 - Lifetime
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a brown out detection circuit of an electric meter system, wherein the electric meter system adopts an AC to DC power supply; the power supply comprises a transformer and a rectification filter circuit positioned at the output side of the transformer; the voltage detection point of the brown out detection circuit is arranged at the rectification filter circuit; the brown out detection circuit comprises a voltage comparison circuit and a drive circuit serially connected with the voltage comparison circuit; the voltage comparison circuit comprises a first input end, a second input end and an output end; and the drive circuit is connected with the output end for giving the switch quantity signal of the brown out detection result. The circuit has wide brown out detection voltage range and low realization cost, and can not fail when the power supply of the electric meter system is damaged.
Description
Technical field
The utility model relates to the ammeter system, relates in particular to a kind of circuit that triggers the accident preprocessing process in the ammeter system.
Background technology
In the ammeter system, need line of electric force unexpected power down to monitor, and need in time make response, preserve accident preprocessing process such as data necessary at short notice with the processor that triggers in the ammeter system to power loss event.The ammeter system generally adopts switching mode AC to change the DC power supply, this power supply comprises transformer, transformer comprises former limit and secondary, former avris with exchange input and link to each other, secondary links to each other with filtering circuit with rectification, present detection of power loss typically uses isolating device, such as: photoelectrical coupler etc., with high-pressure side, just the voltage sampling signal of input one side of transformer is given processor as the power loss event trigger pip, processor according to the outage instantaneous sampling to signal change and to judge whether power down, preserve action thereby carry out data.
Existing this power-fail detection circuit need be adjusted sample circuit according to the scope range of the fluctuation of voltage of civil power on the supply lines of reality, can both carry out detection of power loss to reach sample circuit in the voltage range of regulation, the shortcoming of its existence comprises: the voltage range of detection of power loss is narrower; In case damaging, power supply itself just can't carry out normal detection of power loss; Adopt isolating device and take bigger PCB space, also can cause cost higher, be difficult in mini system, use.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of voltage range broad of detection, can not lose efficacy when power supply damages and realize lower-cost power-fail detection circuit.
The technical scheme that the utility model proposes at above-mentioned technical matters comprises, the power-fail detection circuit of a kind of ammeter system is proposed, this ammeter system adopts AC to change the DC power supply, this power supply comprises transformer and is positioned at the rectification and the filtering circuit of output one side of this transformer, the voltage detecting point of this power-fail detection circuit is arranged on this rectification and filtering circuit place, this power-fail detection circuit comprises voltage comparator circuit and the driving circuit of connecting with this voltage comparator circuit, this voltage comparator circuit comprises first input end, second input end and output terminal, this driving circuit link to each other with this output terminal to provide detection of power loss result's switching value signal.
This voltage comparator circuit comprises and being arranged between this voltage detecting point and the power supply ground and the voltage stabilizing diode of series connection mutually and detect resistance, the end that this voltage stabilizing diode links to each other with this voltage detecting point is this first input end, the end that this detection resistance links to each other with this power supply ground is this second input end, and this voltage stabilizing diode is this output terminal with the end that this detection resistance links to each other.
This voltage comparator circuit also comprises the detection electric capacity in parallel with this detection resistance.
Compared with prior art, the power-fail detection circuit of ammeter of the present utility model system, the voltage range broad of detection of power loss can not lose efficacy when power supply damages and realizes that cost is lower.
Description of drawings
Fig. 1 be ammeter of the present utility model system power-fail detection circuit at a kind of electrical schematic diagram of power circuit.
Fig. 2 is the electrical schematic diagram of the power-fail detection circuit of existing ammeter system.
Fig. 3 is the electrical schematic diagram of the power-fail detection circuit embodiment of ammeter of the present utility model system.
Embodiment
Below in conjunction with accompanying drawing, the utility model is given elaboration further.
Fig. 1 be ammeter of the present utility model system power-fail detection circuit at a kind of electrical schematic diagram of power circuit.This power supply changes the DC power supply for switching mode AC, and it roughly comprises:
The input electromagnetic interference filter circuit that constitutes by voltage dependent resistor (VDR) VR1, inductance L 2 and power choke coil L3 etc.; The input rectifying filtering circuit that constitutes by commutation diode D10 and D1, capacitor C 2 and resistance R 7 etc.; Transformer T1; The rectification and the filtering circuit that constitute by commutation diode D10, inductance L 1 and capacitor C 4 etc.; And constitute ON-OFF control circuit by light lotus root device UP2 and controller U2 etc.
Fig. 2 is the electrical schematic diagram of the power-fail detection circuit of existing ammeter system.This power failure detection method is that power-fail detection circuit is arranged on A point input one side, that belong to the input rectifying filtering circuit place that is positioned at this transformer T1 among Fig. 1.This power-fail detection circuit roughly comprises:
A potential-divider network circuit that constitutes by resistance R 3, R4, R5, R6 and capacitor C 1; The half-wave rectifying circuit that constitutes by commutation diode D10; And the driving circuit that constitutes by light lotus root device UP1.Its principle of work roughly comprises: make voltage that A orders after resistance R 3, R4, R5 and the step-down of R6 current limliting, the voltage at capacitor C 1 two ends is about 3-5VDC; Under the situation of not power down, optocoupler UP1 is in conducting state, and testing result output terminal POWER DEC exports high level; When the unexpected power down of line of electric force, optocoupler UP1 can overturn and be cut-off state, testing result output terminal POWER DEC output low level.
Sort circuit is only guaranteeing that the power circuit that is made of controller U2 and transformer T1 etc. just works under situation about not damaging, in case power circuit damages, such as: controller U2 burns, then optocoupler UP1 may be in conducting state all the time, up to the total system power down, testing result output terminal POWER DEC output level can not overturn and be low level, thereby can't carry out normal detection of power loss, in addition because optocoupler UP1 belongs to isolating device, insulation request is arranged, to having relatively high expectations of PCB fabric swatch, be unfavorable for ammeter system complete machine miniaturization of size.
Fig. 3 is the electrical schematic diagram of the power-fail detection circuit embodiment of ammeter of the present utility model system.This power failure detection method is that power-fail detection circuit is arranged on the B point output that is positioned at transformer T1 one side, that belong to rectification and filtering circuit place among Fig. 1.This power-fail detection circuit comprises:
By voltage stabilizing diode Z5 with detect resistance R 2 and constitute voltage comparator circuit, and the driving circuit that constitutes by triode Q3 and peripheral circuit thereof.Its principle of work roughly comprises:
Detecting resistance R 2 is the current-limiting resistance of this voltage stabilizing diode Z5.Suppose that B point voltage value is V1, the operating voltage of supposing voltage stabilizing diode Z5 is V2, and so, choosing according to the rule of V1-V2＞1V of voltage stabilizing diode Z5 carried out.When the magnitude of voltage of tested measuring point B just often, V1＞V2+1V, voltage stabilizing diode Z5 conducting, in running order, electric current flows through and detects resistance R 2, detects the magnitude of voltage V3=V1-V2＞1V at resistance R 2 two ends.As long as V3 (1V)＞Vbe (0.7V), triode Q3 conducting, testing result output terminal POWER DEC output low level, when line of electric force power down or power supply damage, when B point voltage V1 drops to setting value V2, because voltage stabilizing diode Z5 operating voltage must be higher than V2, at this moment voltage stabilizing diode Z5 upset is cut-off state, detect resistance R 2 both end voltage value V3=0V, triode Q3 ends, and testing result output terminal POWER DEC exports high level.
This detects resistance R 2 can also in parallelly detect capacitor C 71, this detections capacitor C 71 can prevent since the shake that external interference causes with guarantee the stable of detection of power loss process with reliably, thereby the maloperation of stopping detection of power loss.Preferably, the value of this capacitor C 71 can be selected 0.01～0.68 μ F for use, and the value size of described capacitor C 71 depends primarily on the speed of required detection of power loss response, and promptly the value of capacitor C 71 is big more, and then the response speed of detection of power loss is slow more; Otherwise it is then opposite.
Need to prove, the power failure detection method and the circuit of ammeter of the present utility model system, change the DC power supply except can be applicable to above-mentioned switching mode AC, also can use plain edition AC and change the DC power supply, this power supply comprises transformer, and this transformer comprises former limit and secondary, former avris with exchange input and link to each other, secondary links to each other with filtering circuit with rectification, and the voltage detecting point of power-fail detection circuit is arranged on this rectification and filtering circuit place.
Compared with prior art, the power-fail detection circuit of ammeter of the present utility model system, owing to be output one side that check point is arranged on transformer, antijamming capability is stronger; Only need to select the specification of voltage stabilizing diode Z5, just can correspondingly adjust the magnitude of voltage that needs detect, very simple and convenient; And because driving circuit need not adopt optocoupler, and can select simple triode for use, can reduce cost.
Foregoing; it only is preferred embodiment of the present utility model; be not to be used to limit embodiment of the present utility model; those of ordinary skills are according to main design of the present utility model and spirit; protection domain of the present utility model can carry out corresponding flexible or modification very easily, so should be as the criterion with the desired protection domain of claims.
Claims (3)
1. the power-fail detection circuit of an ammeter system, this ammeter system adopts AC to change the DC power supply, this power supply comprises transformer and is positioned at the rectification and the filtering circuit of output one side of this transformer, it is characterized in that, the voltage detecting point of this power-fail detection circuit is arranged on this rectification and filtering circuit place, this power-fail detection circuit comprises voltage comparator circuit and the driving circuit of connecting with this voltage comparator circuit, this voltage comparator circuit comprises first input end, second input end and output terminal, and this driving circuit links to each other with this output terminal to provide detection of power loss result's switching value signal.
2. power-fail detection circuit as claimed in claim 1, it is characterized in that, this voltage comparator circuit comprises and being arranged between this voltage detecting point and the power supply ground and the voltage stabilizing diode of series connection mutually and detect resistance, the end that this voltage stabilizing diode links to each other with this voltage detecting point is this first input end, the end that this detection resistance links to each other with this power supply ground is this second input end, and this voltage stabilizing diode is this output terminal with the end that this detection resistance links to each other.
3. power-fail detection circuit as claimed in claim 2 is characterized in that, this voltage comparator circuit also comprises the detection electric capacity in parallel with this detection resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020273441 CN201724975U (en) | 2010-07-27 | 2010-07-27 | Brown out detection circuit of electric meter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020273441 CN201724975U (en) | 2010-07-27 | 2010-07-27 | Brown out detection circuit of electric meter system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201724975U true CN201724975U (en) | 2011-01-26 |
Family
ID=43493315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020273441 Expired - Lifetime CN201724975U (en) | 2010-07-27 | 2010-07-27 | Brown out detection circuit of electric meter system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201724975U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN103163358A (en) * | 2013-03-01 | 2013-06-19 | 深圳市泰昂能源科技股份有限公司 | Fast and reliable alternative current power failure detection circuit |
| CN104749423A (en) * | 2013-12-31 | 2015-07-01 | 东莞钜威新能源有限公司 | Power failure detection circuit for direct current power supply |
| CN104834369A (en) * | 2015-05-11 | 2015-08-12 | 北方信息控制集团有限公司 | Power failure data protection device of real-time control system |
| CN105116351A (en) * | 2015-08-19 | 2015-12-02 | 许继集团有限公司 | Multi-way power supply failure alarm device |
| CN108196113A (en) * | 2017-12-30 | 2018-06-22 | 武汉长光科技有限公司 | A kind of quick warning circuit of ONU power down for PON system |
| CN108594082A (en) * | 2018-06-28 | 2018-09-28 | 苏州欧普照明有限公司 | A kind of alternating current power-off signal transmission circuit and method |
| CN109963395A (en) * | 2018-10-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of control device |
| WO2020011224A1 (en) * | 2018-07-12 | 2020-01-16 | 青岛亿联客信息技术有限公司 | Flashoff switch detection circuit and electronic device including same |
-
2010
- 2010-07-27 CN CN 201020273441 patent/CN201724975U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN102338823B (en) * | 2010-07-27 | 2015-08-26 | 深圳长城开发科技股份有限公司 | The power failure detection method of electric meter system and circuit |
| CN103163358B (en) * | 2013-03-01 | 2016-01-27 | 深圳市泰昂能源科技股份有限公司 | Alternative current power failure detection circuit |
| CN103163358A (en) * | 2013-03-01 | 2013-06-19 | 深圳市泰昂能源科技股份有限公司 | Fast and reliable alternative current power failure detection circuit |
| CN104749423A (en) * | 2013-12-31 | 2015-07-01 | 东莞钜威新能源有限公司 | Power failure detection circuit for direct current power supply |
| CN104834369A (en) * | 2015-05-11 | 2015-08-12 | 北方信息控制集团有限公司 | Power failure data protection device of real-time control system |
| CN105116351A (en) * | 2015-08-19 | 2015-12-02 | 许继集团有限公司 | Multi-way power supply failure alarm device |
| CN105116351B (en) * | 2015-08-19 | 2019-02-05 | 许继集团有限公司 | A kind of multiple power supplies power failure alarm device |
| CN108196113A (en) * | 2017-12-30 | 2018-06-22 | 武汉长光科技有限公司 | A kind of quick warning circuit of ONU power down for PON system |
| CN108594082A (en) * | 2018-06-28 | 2018-09-28 | 苏州欧普照明有限公司 | A kind of alternating current power-off signal transmission circuit and method |
| CN108594082B (en) * | 2018-06-28 | 2024-01-26 | 苏州欧普照明有限公司 | Power-down signal transmission circuit and method for commercial power |
| WO2020011224A1 (en) * | 2018-07-12 | 2020-01-16 | 青岛亿联客信息技术有限公司 | Flashoff switch detection circuit and electronic device including same |
| CN109963395A (en) * | 2018-10-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of control device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201724975U (en) | Brown out detection circuit of electric meter system | |
| CN102338823B (en) | The power failure detection method of electric meter system and circuit | |
| CN202217019U (en) | Three-phase supply input open phase detection circuit | |
| CN205665378U (en) | Relay adhesion detection circuitry | |
| CN103149530A (en) | Relay tester | |
| CN202770920U (en) | Alternating current vacuum contactor adhesion detection device | |
| CN103208782A (en) | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies | |
| CN201689129U (en) | Power-down detecting device | |
| CN204374385U (en) | Electric energy meter user end disconnecting link folding testing circuit | |
| CN102998620B (en) | Device and method for quick online fault detection of high voltage thyristor valve block | |
| CN103308755B (en) | The insulation detection device of high voltage direct current remote electric power system and method | |
| CN103353569A (en) | Relay connection state detecting apparatus | |
| CN102508155A (en) | Test circuit for internally installed load switch of intelligent electric energy meter | |
| CN103353561A (en) | System and method for detecting alternating-current circuit of wind turbine generator | |
| CN101217232B (en) | A total current type residual current operating device with functions of automatic tripping on element failures | |
| CN106410757B (en) | A kind of short-circuit protection circuit | |
| CN104777436A (en) | Novel alternating current power supply monitoring device | |
| CN201868333U (en) | Relay control circuit with current detection function | |
| CN203513016U (en) | Power supply open-phase protection device of lift control cabinet | |
| CN202957571U (en) | Electric leakage detection circuit for single-phase power supply of isolated neutral system | |
| CN203406776U (en) | DC power supply | |
| CN211127104U (en) | Circuit breaker | |
| CN202708270U (en) | Electromagnetic valve control circuit | |
| CN209656865U (en) | A kind of DC voltage overvoltage/undervoltage detection circuit | |
| CN103245872B (en) | AC fuse condition checkout gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110126 Effective date of abandoning: 20150826 |
|
| RGAV | Abandon patent right to avoid regrant |