CN103163358A - Fast and reliable alternative current power failure detection circuit - Google Patents
Fast and reliable alternative current power failure detection circuit Download PDFInfo
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- CN103163358A CN103163358A CN2013100656209A CN201310065620A CN103163358A CN 103163358 A CN103163358 A CN 103163358A CN 2013100656209 A CN2013100656209 A CN 2013100656209A CN 201310065620 A CN201310065620 A CN 201310065620A CN 103163358 A CN103163358 A CN 103163358A
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Abstract
A rapid and reliable alternative current power failure detection circuit includes a signal rectifier module (10), a signal detection module (20) and a signal plastic module (30) which are connected in sequence. The signal detection module (20) includes a switching element Q1 which is controlled by the signal rectifier module (10) and an energy storage component C1 which is connected with the switching element Q1 and a charging power supply V. The circuit structure is simple, cost is low, but alternative current power failure signals can be guaranteed to be fast detected in half of the alternative current cycle. When the alternative current signals are failed instantaneously or under other abnormal conditions, no malfunctions appear. The problems in the alternative current failure power detection circuit are solved, all the electronic devices can rapidly detect and correctly operate when the condition of alternative current failure power occurs, and the performance and reliability of equipment are improved.
Description
Technical field
The present invention relates to testing circuit, particularly the testing circuit of electronic equipment single-phase AC signal detection of power loss.
Background technology
Use in the electronic equipment of ac power supply at great majority, when the input ac power power down, the signal that exchanges the input power down need to be detected fast, and equipment is carried out necessary protection, to guarantee the normal operation of electronic equipment.Particularly to now increasing sophisticated electronics, more need the signal that AC dump detected as early as possible, and avoid the testing circuit malfunction to cause the unit exception operation.But be the signal of a Symmetrical due to alternating current input power supplying itself, the voltage zero-cross when causing the voltage natural zero-crossing characteristic of AC signal and AC dump can't effectively be distinguished.Therefore, present various testing circuit mainly drops to certain value and just carries out alarm by detection input exchange signal mean value, peak value equivalent, but both substantially can't solving, fast detecting to the AC dump signal, the contradiction of misoperation in the situations such as instantaneous disturbance falls can not occur in AC signal again.Owing to can not identifying fast and accurately the AC dump signal, affected to a great extent the Performance And Reliability of electronic equipment.
Summary of the invention
The invention provides a kind of testing circuit of AC signal power down, adopt energy-storage travelling wave tube to match with on-off element, compare and shaping, solve and detect technical matters inaccurate and that misoperation occurs in prior art.
The present invention comprises for this AC dump testing circuit that provides is provided signal rectification module, signal detection module and the signal shaping module that connects successively, and described signal detection module comprises the on-off element Q1 that is controlled by described signal rectification module and connects this on-off element Q1 and the energy-storage travelling wave tube C1 of charge power supply V.
Described signal rectification module comprises the rectification circuit that connects the AC signal input, described rectification circuit is bridge rectifier circuit, comprise diode D1 to D4, described AC signal input connects respectively between described diode D1 and D3 and diode D2 and D4, and the input end of described signal detection module connects respectively between described diode D1 and D2 and diode D3 and D4.Described signal detection module also comprises divider resistance R1 and the R2 of series connection, this divider resistance R1 is connected two ends and is connected described signal detection module with R2, described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal detection module link ground connection.
Described on-off element Q1 is triode, its base stage is connected between divider resistance R1 and R2, its collector connects the end of described charge power supply V and energy-storage travelling wave tube C1, its emitter connects the other end and the ground connection of described energy-storage travelling wave tube C1, described energy-storage travelling wave tube C1 is electric capacity, is in series with charging resistor R3 between described energy-storage travelling wave tube C1 and charge power supply V.
Described signal shaping module comprises divider resistance R4 and the R5 of shaping element U1 and series connection, the divider resistance R4 of this series connection and R5 connect respectively the earth terminal of described charge power supply V and energy-storage travelling wave tube C1, described shaping element U1 comprises two signal input parts, wherein cold end connects the collector of described on-off element Q1, hot end connects between divider resistance R4 and R5, and this shaping element U1 also comprises earth terminal, power input and signal output part.Described shaping element U1 is comparator circuit, and this comparator circuit is operational amplifier or comparer, and perhaps described shaping element U1 is shaping circuit, and this shaping circuit is triode or metal-oxide-semiconductor.
Circuit structure of the present invention is simple, with low cost, but can guarantee the AC dump signal to be detected fast in half ac cycle, and guarantee misoperation not occur instantaneous the falling etc. under abnormal conditions of AC signal, solved the contradiction in existing AC dump testing circuit, guarantee each electronic equipment fast detecting and correct operation when exchanging the generation of input power-down conditions, improved the Performance And Reliability of equipment.
Description of drawings
Fig. 1 is the principle schematic of testing circuit of the present invention.
Embodiment
In conjunction with above-mentioned description of drawings specific embodiments of the invention.
By in Fig. 1 as can be known, the AC dump testing circuit of this fast and reliable comprises signal rectification module 10, signal detection module 20 and the signal shaping module 30 that connects successively, and described signal detection module 20 comprises the on-off element Q1 that is controlled by described signal rectification module 10 and connects this on-off element Q1 and the energy-storage travelling wave tube C1 of charge power supply V.The present invention utilizes energy-storage travelling wave tube to charge, the energy that utilizes on-off element to control energy-storage travelling wave tube discharges, cause thus the variation of level at the input end of signal shaping module 30, produce control signal, be controlled by the signal rectification module of front end due to on-off element, in the time can not discharging the energy-storage travelling wave tube energy for a long time, to produce noble potential on energy-storage travelling wave tube, two input ends of signal shaping module 30 are all noble potentials, and Shaping Module will be exported power-off signal, otherwise, will not export power-off signal.The most important inventive point of this patent is: utilize the ac input signal cyclophysis to control the periodic discharging of storage capacitor to realize the detection to abnormal signal.
By in Fig. 1 as can be known, described signal rectification module 10 comprises the rectification circuit 11 that connects the AC signal input, described rectification circuit 11 is bridge rectifier circuit, comprise diode D1 to D4, described AC signal input connects respectively between described diode D1 and D3 and diode D2 and D4, and the input end of described signal detection module 20 connects respectively between described diode D1 and D2 and diode D3 and D4.The present invention's the 1st ingredient is the AC signal rectifying part, the rectification circuit that is comprised of diode D1～D4 as shown in FIG..The controlled rectification circuit of the different topology that this rectifying part also is made of other kind electron devices, not control rectifying circuit or precise rectification circuit.
By in Fig. 1 as can be known, described signal detection module 20 also comprises divider resistance R1 and the R2 of series connection, this divider resistance R1 is connected two ends and is connected described signal detection module 20 with R2, described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal detection module 20 link ground connection.Described on-off element Q1 is triode, and its base stage is connected between divider resistance R1 and R2, and its collector connects the end of described charge power supply V and energy-storage travelling wave tube C1, and its emitter connects the other end and the ground connection of described energy-storage travelling wave tube C1.Described energy-storage travelling wave tube C1 is electric capacity, is in series with charging resistor R3 between described energy-storage travelling wave tube C1 and charge power supply V.The present invention's the 2nd ingredient is the input part, is comprised of resistance R 1 ~ R3, capacitor C 1 and transistor Q1 as shown in FIG..Wherein Q1 can be the controlled electron devices such as triode, metal-oxide-semiconductor, the comparator circuit that also is made of active devices such as amplifier, comparers.
By in Fig. 1 as can be known, described signal shaping module 30 comprises divider resistance R4 and the R5 of shaping element U1 and series connection, the divider resistance R4 of this series connection and R5 connect respectively the earth terminal of described charge power supply V and energy-storage travelling wave tube C1, described shaping element U1 comprises two signal input parts, wherein cold end connects the collector of described on-off element Q1, hot end connects between divider resistance R4 and R5, and this shaping element U1 also comprises earth terminal, power input and signal output part.Described shaping element U1 is comparator circuit, and this comparator circuit is operational amplifier or comparer, and perhaps described shaping element U1 is shaping circuit, and this shaping circuit is triode or metal-oxide-semiconductor.The present invention's the 3rd part is signal comparison and shaping unit, is comprised of resistance R 4, R5 and U1 as shown in FIG..Signal comparison and shaping unit can be the comparator circuits that is made of active devices such as amplifier, comparers as shown in the figure, other shaping circuit that also is made of electron devices such as triode, metal-oxide-semiconductors.
As follows with circuit explanation shown in Figure 1 principle of work of the present invention: input exchange signal connects rectifying part in the present invention, and the steamed bun ripple signal that signal produces after rectification is sent into the input part.Steamed bun ripple signal is through R1, and R2 is divided to suitable grade, is used for driving transistors Q1.Characteristic and needed minimum alarm magnitude of voltage according to the Q1 device, the parameter of suitable selection R1 and R2, when making AC-input voltage greater than the alarm magnitude of voltage, when voltage rises to a certain voltage in every half ac cycle, Q1 can conducting, it is discharged to C1, turn-off through Q1 after dropping to certain magnitude of voltage after peak value at alternating voltage, C1 charges by R3, until next Q1 opens discharge.When the interchange input was normal, once to the C1 discharge, C1 voltage can not reach the rotary movement voltage of subsequent conditioning circuit in every half ac cycle Q1 conducting; And cause input signal less or when disappearing the long period fully in abnormal conditions, at this moment, the interior Q1 of section will turn-off always, and C1 continues charging, and C1 voltage continues the rotary movement voltage that rising finally meets and exceeds late-class circuit, the late-class circuit rotary movement, the output AC power-off signal.Suitable configurations R3, R4, R5 and C1 parameter can arrange the protection action delay time as required.
According to the circuit working principle, this circuit can detect the AC dump signal half AC signal in the cycle reliably, and instantaneous fall or when shaking occur in AC signal, can not cause the misoperation of circuit and the signal of output error has stronger antijamming capability.Simultaneously, the present invention is simple in structure, and is with low cost, and flexible design, is easy to realize.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. the AC dump testing circuit of a fast and reliable, it is characterized in that: this testing circuit comprises signal rectification module (10), signal detection module (20) and the signal shaping module (30) that connects successively, and described signal detection module (20) comprises the on-off element Q1 that is controlled by described signal rectification module (10) and connects this on-off element Q1 and the energy-storage travelling wave tube C1 of charge power supply V.
2. the AC dump testing circuit of fast and reliable according to claim 1, it is characterized in that: described signal rectification module (10) comprises the rectification circuit (11) that connects the AC signal input.
3. the AC dump testing circuit of fast and reliable according to claim 2, it is characterized in that: described rectification circuit (11) is bridge rectifier circuit, comprise diode D1 to D4, described AC signal input connects respectively between described diode D1 and D3 and diode D2 and D4, and the input end of described signal detection module (20) connects respectively between described diode D1 and D2 and diode D3 and D4.
4. the AC dump testing circuit of the described fast and reliable of any one according to claim 1 to 3, it is characterized in that: described signal detection module (20) also comprises divider resistance R1 and the R2 of series connection, this divider resistance R1 is connected two ends and is connected described signal detection module (20) with R2, described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal detection module (20) link ground connection.
5. the AC dump testing circuit of fast and reliable according to claim 4, it is characterized in that: described on-off element Q1 is triode, its base stage is connected between divider resistance R1 and R2, its collector connects the end of described charge power supply V and energy-storage travelling wave tube C1, and its emitter connects the other end and the ground connection of described energy-storage travelling wave tube C1.
6. the AC dump testing circuit of fast and reliable according to claim 4, it is characterized in that: described energy-storage travelling wave tube C1 is electric capacity, is in series with charging resistor R3 between described energy-storage travelling wave tube C1 and charge power supply V.
7. the AC dump testing circuit of fast and reliable according to claim 5, it is characterized in that: described signal shaping module (30) comprises divider resistance R4 and the R5 of shaping element U1 and series connection, the divider resistance R4 of this series connection and R5 connect respectively the earth terminal of described charge power supply V and energy-storage travelling wave tube C1, described shaping element U1 comprises two signal input parts, wherein cold end connects the collector of described on-off element Q1, hot end connects between divider resistance R4 and R5, and this shaping element U1 also comprises earth terminal, power input and signal output part.
8. the AC dump testing circuit of fast and reliable according to claim 7, it is characterized in that: described shaping element U1 is comparator circuit, this comparator circuit is operational amplifier or comparer.
9. the AC dump testing circuit of fast and reliable according to claim 7, it is characterized in that: described shaping element U1 is shaping circuit, this shaping circuit is triode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310065620.9A CN103163358B (en) | 2013-03-01 | 2013-03-01 | Alternative current power failure detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310065620.9A CN103163358B (en) | 2013-03-01 | 2013-03-01 | Alternative current power failure detection circuit |
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| CN103163358A true CN103163358A (en) | 2013-06-19 |
| CN103163358B CN103163358B (en) | 2016-01-27 |
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| CN201310065620.9A Active CN103163358B (en) | 2013-03-01 | 2013-03-01 | Alternative current power failure detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456137A (en) * | 2019-09-18 | 2019-11-15 | 图佳电子技术有限公司 | A kind of power down acquisition unit networked |
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
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| CA1020660A (en) * | 1971-11-16 | 1977-11-08 | Gary L. Pollitt | Responsive power-fail detection system |
| CN2682506Y (en) * | 2004-03-17 | 2005-03-02 | 海信集团有限公司 | Tax-control cashing machine with novel power supply monitoring module |
| US20050151524A1 (en) * | 2004-01-13 | 2005-07-14 | Sakda Sae-Ueng | Modular power supply system including a power status signal generator to perform fast sag detection to input peak voltage |
| CN200962514Y (en) * | 2006-10-25 | 2007-10-17 | 深圳桑达国际电子器件有限公司 | Electricity drop detection device |
| CN201724975U (en) * | 2010-07-27 | 2011-01-26 | 深圳长城开发科技股份有限公司 | Brown out detection circuit of electric meter system |
| 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 |
| CN202305717U (en) * | 2011-10-13 | 2012-07-04 | 瑞谷科技(深圳)有限公司 | AC power failure quick detection circuit |
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2013
- 2013-03-01 CN CN201310065620.9A patent/CN103163358B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1020660A (en) * | 1971-11-16 | 1977-11-08 | Gary L. Pollitt | Responsive power-fail detection system |
| US20050151524A1 (en) * | 2004-01-13 | 2005-07-14 | Sakda Sae-Ueng | Modular power supply system including a power status signal generator to perform fast sag detection to input peak voltage |
| CN2682506Y (en) * | 2004-03-17 | 2005-03-02 | 海信集团有限公司 | Tax-control cashing machine with novel power supply monitoring module |
| CN200962514Y (en) * | 2006-10-25 | 2007-10-17 | 深圳桑达国际电子器件有限公司 | Electricity drop detection device |
| CN201724975U (en) * | 2010-07-27 | 2011-01-26 | 深圳长城开发科技股份有限公司 | Brown out detection circuit of electric meter system |
| 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 |
| CN202305717U (en) * | 2011-10-13 | 2012-07-04 | 瑞谷科技(深圳)有限公司 | AC power failure quick detection circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
| CN110456137A (en) * | 2019-09-18 | 2019-11-15 | 图佳电子技术有限公司 | A kind of power down acquisition unit networked |
| CN110456137B (en) * | 2019-09-18 | 2024-02-27 | 石家庄玮舒琦新能源科技有限公司 | Networking power-down acquisition unit |
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| CN103163358B (en) | 2016-01-27 |
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