CN103163358B - Alternative current power failure detection circuit - Google Patents
Alternative current power failure detection circuit Download PDFInfo
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- CN103163358B CN103163358B CN201310065620.9A CN201310065620A CN103163358B CN 103163358 B CN103163358 B CN 103163358B CN 201310065620 A CN201310065620 A CN 201310065620A CN 103163358 B CN103163358 B CN 103163358B
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Abstract
A kind of alternative current power failure detection circuit of fast and reliable comprises the signal rectification module (10), signal detection module (20) and the signal shaping module (30) that connect successively, and described signal detection module (20) comprises the on-off element Q1 being controlled by described signal rectification module (10) and the energy-storage travelling wave tube C1 connecting this on-off element Q1 and charge power supply V.Circuit structure of the present invention is simple, with low cost, but can ensure AC dump signal to be detected fast in half ac cycle, and ensure AC signal is instantaneous the abnormal conditions such as to fall under there is not misoperation, solve the contradiction in existing alternative current power failure detection circuit, ensure that each electronic equipment detects and correct operation fast when exchanging input power-down conditions and occurring, improve the Performance And Reliability of equipment.
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 at great majority in the electronic equipment of ac power supply, when input ac power power down, need the signal exchanging input power down to be detected fast, and necessary protection is carried out, to ensure the normal work of electronic equipment to equipment.Particularly to present increasing sophisticated electronics, more need signal AC dump being detected as early as possible, and avoid testing circuit malfunction to cause unit exception to operate.But due to the signal that alternating current input power supplying itself is a Symmetrical, cause the voltage zero-cross when voltage natural zero-crossing characteristic of AC signal and AC dump effectively to distinguish.Therefore, present various testing circuit drops to certain value just carry out alarm mainly through detection input exchange signal mean value, peak value equivalent, but substantially cannot solve and both AC dump signal be detected fast, again can not the contradiction of misoperation under the situations such as instantaneous disturbance falls appear in AC signal.Due to AC dump signal can not be identified fast and accurately, have impact on the Performance And Reliability of electronic equipment to a great extent.
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, detect inaccurate in solution prior art and occur the technical matters of misoperation.
The present invention is for solve the problems of the technologies described above and this alternative current power failure detection circuit provided comprises the signal rectification module, signal detection module and the signal shaping module that connect successively, and described signal detection module comprises the on-off element Q1 being controlled by described signal rectification module and the energy-storage travelling wave tube C1 connecting this on-off element Q1 and charge power supply V.
Described signal rectification module comprises the rectification circuit connecting AC signal input, described rectification circuit is bridge rectifier circuit, comprise diode D1 to D4, described AC signal input connects between described diode D1 and D3 and diode D2 and D4 respectively, and the input end of described signal detection module connects between described diode D1 and D2 and diode D3 and D4 respectively.Described signal detection module also comprises divider resistance R1 and R2 of series connection, the two ends of this divider resistance R1 with R2 are connected described signal rectification module, described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal rectification module attachment end ground connection.
Described on-off element Q1 is triode, its base stage is connected between divider resistance R1 and R2, its collector connects one end of described charge power supply V and energy-storage travelling wave tube C1, its emitter connects the other end of described energy-storage travelling wave tube C1 and ground connection, 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 R5 of shaping element U1 and series connection, divider resistance R4 with R5 of this series connection is connected the earth terminal of described charge power supply V and energy-storage travelling wave tube C1 respectively, 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, or 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 ensure AC dump signal to be detected fast in half ac cycle, and ensure AC signal is instantaneous the abnormal conditions such as to fall under there is not misoperation, solve the contradiction in existing alternative current power failure detection circuit, ensure that each electronic equipment detects and correct operation fast when exchanging input power-down conditions and occurring, improve the Performance And Reliability of equipment.
Accompanying drawing explanation
Fig. 1 is the principle schematic of testing circuit of the present invention.
Embodiment
In conjunction with above-mentioned accompanying drawing, specific embodiments of the invention are described.
From in Fig. 1, this alternative current power failure detection circuit comprises the signal rectification module 10, signal detection module 20 and the signal shaping module 30 that connect successively, and described signal detection module 20 comprises the on-off element Q1 being controlled by described signal rectification the module 10 and energy-storage travelling wave tube C1 connecting this on-off element Q1 and charge power supply V.The present invention utilizes energy-storage travelling wave tube to charge, on-off element is utilized to control the fault offset of energy-storage travelling wave tube, cause the change of level thus at the input end of signal shaping module 30, produce control signal, because on-off element is controlled by the signal rectification module of front end, when energy-storage travelling wave tube energy can not be discharged for a long time, energy-storage travelling wave tube will produce noble potential, and two input ends of signal shaping module 30 are all noble potentials, and Shaping Module will export power-off signal, otherwise, will not power-off signal be exported.The most important inventive point of this patent is: utilize ac input signal cyclophysis to control the periodic discharging of storage capacitor to realize the detection to abnormal signal.
From in Fig. 1, described signal rectification module 10 comprises the rectification circuit 11 connecting AC signal input, described rectification circuit 11 is bridge rectifier circuit, comprise diode D1 to D4, described AC signal input connects between described diode D1 and D3 and diode D2 and D4 respectively, and the input end of described signal detection module 20 connects between described diode D1 and D2 and diode D3 and D4 respectively.The present invention the 1st ingredient is AC signal rectifying part, the rectification circuit be made up of diode D1 ~ D4 as illustrated in the drawing.This rectifying part may also be the controlled rectification circuit of the different topology be made up of other kind electron devices, uncontrollable rectifier circuit or precise rectification circuit.
From in Fig. 1, described signal detection module 20 also comprises divider resistance R1 and R2 of series connection, the two ends of this divider resistance R1 with R2 are connected described signal rectification module 10, described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal rectification module 10 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 one end of described charge power supply V and energy-storage travelling wave tube C1, and its emitter connects the other end of described energy-storage travelling wave tube C1 and ground connection.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 the 2nd ingredient is input part, is made up of as shown in FIG. resistance R1 ~ R3, electric capacity C1 and transistor Q1.Wherein Q1 can be the controlled electron such as triode, metal-oxide-semiconductor device, may also be the comparator circuit be made up of the active device such as amplifier, comparer.
From in Fig. 1, described signal shaping module 30 comprises divider resistance R4 and R5 of shaping element U1 and series connection, divider resistance R4 with R5 of this series connection is connected the earth terminal of described charge power supply V and energy-storage travelling wave tube C1 respectively, 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, or described shaping element U1 is shaping circuit, and this shaping circuit is triode or metal-oxide-semiconductor.The present invention the 3rd part is that signal compares and shaping unit, is made up of as shown in FIG. resistance R4, R5 and U1.It can be the comparator circuit be made up of the active device such as amplifier, comparer as shown in the figure that signal compares with shaping unit, may also be other shaping circuit be made up of the electron device such as triode, metal-oxide-semiconductor.
Illustrate that principle of work of the present invention is as follows with circuit shown in Fig. 1: input exchange signal connects rectifying part in the present invention, the steamed bun ripple signal that signal produces after rectification sends into input part.Steamed bun ripple signal is divided to suitable grade through R1, R2, for driving transistors Q1.According to characteristic and the required minimum alarm magnitude of voltage of Q1 device, the parameter of suitable selection R1 and R2, when making AC-input voltage be greater than alarm magnitude of voltage, in every half ac cycle, voltage rise can conducting to Q1 during a certain voltage, it is made to discharge to C1, after alternating voltage drops to certain magnitude of voltage after peak value, Q1 turns off, and C1 is charged by R3, until next Q1 opens electric discharge.When exchanging input and being normal, every half ac cycle Q1 conducting is once to C1 electric discharge, and C1 voltage can not reach the rotary movement voltage of subsequent conditioning circuit; And abnormal conditions cause input signal less or completely disappear the long period time, at this moment, in section, Q1 will turn off always, and C1 continues charging, and C1 voltage keeps raises the rotary movement voltage finally meeting and exceeding late-class circuit, late-class circuit rotary movement, output AC power-off signal.Suitable configurations R3, R4, R5 and C1 parameter, can arrange protection act delay time as required.
According to circuit working principle, this circuit can detect AC dump signal reliably within half AC signal cycle, and AC signal occur instantaneous fall or shake time, the misoperation of circuit and the signal of output error can not be caused, there is stronger antijamming capability.Meanwhile, structure of the present invention is simple, 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 specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. an alternative current power failure detection circuit, it is characterized in that: this testing circuit comprises the signal rectification module (10), signal detection module (20) and the signal shaping module (30) that connect successively, described signal detection module (20) comprises the on-off element Q1 being controlled by described signal rectification module (10) and the energy-storage travelling wave tube C1 connecting this on-off element Q1 and charge power supply V.
2. alternative current power failure detection circuit according to claim 1, is characterized in that: described signal rectification module (10) comprises the rectification circuit (11) connecting AC signal input.
3. alternative current power failure detection circuit 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 between described diode D1 and D3 and diode D2 and D4 respectively, and the input end of described signal detection module (20) connects between described diode D1 and D2 and diode D3 and D4 respectively.
4. alternative current power failure detection circuit according to any one of claims 1 to 3, it is characterized in that: described signal detection module (20) also comprises divider resistance R1 and R2 of series connection, the two ends of this divider resistance R1 with R2 are connected described signal rectification module (10), described on-off element Q1 is connected between divider resistance R1 and R2, described divider resistance R2 and signal rectification module (10) link ground connection.
5. alternative current power failure detection circuit 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 one end of described charge power supply V and energy-storage travelling wave tube C1, and its emitter connects the other end of described energy-storage travelling wave tube C1 and ground connection.
6. alternative current power failure detection circuit according to claim 4, 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. alternative current power failure detection circuit according to claim 5, it is characterized in that: described signal shaping module (30) comprises divider resistance R4 and R5 of shaping element U1 and series connection, divider resistance R4 with R5 of this series connection is connected the earth terminal of described charge power supply V and energy-storage travelling wave tube C1 respectively, 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. alternative current power failure detection circuit 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. alternative current power failure detection circuit 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.
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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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| 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 CN103163358A (en) | 2013-06-19 |
| CN103163358B true 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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Families Citing this family (3)
| 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 |
| 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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| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7002331B2 (en) * | 2004-01-13 | 2006-02-21 | Delta Electronics, Inc. | Modular power supply system including a power status signal generator to perform fast sag detection to input peak voltage |
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2013
- 2013-03-01 CN CN201310065620.9A patent/CN103163358B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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