CN202421401U - Automatic power failure identification circuit - Google Patents
Automatic power failure identification circuit Download PDFInfo
- Publication number
- CN202421401U CN202421401U CN2011205486431U CN201120548643U CN202421401U CN 202421401 U CN202421401 U CN 202421401U CN 2011205486431 U CN2011205486431 U CN 2011205486431U CN 201120548643 U CN201120548643 U CN 201120548643U CN 202421401 U CN202421401 U CN 202421401U
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- Prior art keywords
- circuit
- limiting
- electrical network
- current
- signal generator
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- Expired - Fee Related
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Abstract
The utility model relates to an automatic power failure identification circuit, which comprises a signal generator, a current limiting resistor and a detection circuit, wherein the detection circuit is bridged between two power grid incoming lines of which one is electrically connected with the signal generator through the current limiting resistor; and the signal generator is also electrically connected with the detection circuit. A burst detection mode is adopted, interference can be avoided only by coordinating a detection interval and output power even though a great number of detection circuits are connected in parallel, and influence on normal detection is avoided.
Description
Technical field
The utility model relates to identification circuit, is specifically related to a kind of outage automatic identification circuit.
Background technology
At present the light fixture of band back-up source all can't autonomous classification be that grid cut-off or user break off electrical network and initiatively turn off the light; So can only being set in addition, special switch perhaps uses particular form light modulations such as remote control; On original circuit, reequip very trouble for the user, even can't reequip.
Also there is partial design to attempt to judge whether to be connected on the electrical network through the mode that electric resistance partial pressure detects; But the scope of application of this mode is very limited; Only be suitable for the occasion that there is resistance loop in the electrical network end; In case be the power down that broken string causes, do not exist the load of other strip resistance character then can detect failure like the electrical network end.And present most of electrical equipment all uses the Switching Power Supply power supply, shows that in fact the electrical network input end is a capacitive load.Use level dividing potential drop mode to detect simultaneously, if on the same circuit and connect behind this circuit of some because the stack of electric current in fact can't detect.
The utility model content
In order to overcome the deficiency of prior art, the purpose of the utility model is to provide a kind of outage automatic identification circuit that can effectively judge electrical network inlet wire state, and it can make things convenient for the circuit repacking after increasing back-up source of various light fixtures and consumer.
In order to achieve the above object, the technical scheme that the utility model adopted is following:
A kind of outage automatic identification circuit, it comprises signal generator, current-limiting resistance and testing circuit; Testing circuit is connected across between two electrical network inlet wires, and an electrical network inlet wire in two electrical network inlet wires is through current-limiting resistance and signal generator electric connection, and signal generator also electrically connects with testing circuit.
Preferably, said testing circuit comprises current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit, and current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit electrically connect successively; The current limiting pressure-limiting circuit is connected across between two electrical network inlet wires.
Preferably; Signal generator and testing circuit are integrated in the circuit that is made up of current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer, driving circuit; Current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer electrically connect successively; Single-chip microcomputer also electrically connects through driving circuit and current-limiting resistance, and the current limiting pressure-limiting circuit is connected across between two electrical network inlet wires.
The utility model compared with prior art adopts the burst detection mode, as long as coordinate assay intervals and output power, even a large amount of testing circuit and connect also and can not produce the phase mutual interference influences its normal detection.For a large amount of light fixtures and the system that connects, have a good application prospect like street lamp, market, office space, factory etc.
Description of drawings
Fig. 1 is the principle schematic of the outage automatic identification circuit of the utility model embodiment;
Fig. 2 is the circuit block diagram of application example one of the outage automatic identification circuit of the utility model embodiment;
Fig. 3 is the circuit block diagram of application example two of the outage automatic identification circuit of the utility model embodiment.
Embodiment
Below, in conjunction with accompanying drawing and embodiment, the utility model done further describing, so that clearerly understand the utility model technological thought required for protection.
As shown in Figure 1, a kind of outage automatic identification circuit, it comprises signal generator, current-limiting resistance and testing circuit.Testing circuit is connected across between electrical network inlet wire L, the electrical network inlet wire N, and electrical network inlet wire L (also can be electrical network inlet wire N) electrically connects through current-limiting resistance and signal generator, and signal generator also electrically connects with testing circuit.
The outage automatic identification circuit of present embodiment can be connected in the circuit of various light fixtures with back-up source and consumer, when light fixture or consumer outage, is used to judge electrical network inlet wire state, with the keying of control back-up source.Said electrical network inlet wire state comprises and net state and suspension state; And net state is meant that the state of electrical network inlet wire and switch closure (is that light fixture or consumer are under normal operating position; The state that electrical network breaks down or has a power failure); The suspension state is meant the state (promptly unplug switch and electrical network inlet wire artificially, initiatively cut away the state of light fixture or consumer power supply) that electrical network inlet wire and switch terminals are opened.
The principle of work of present embodiment is: during outage; Electrical network inlet wire state is detected: signal generator produces a pulse detection signals, and this pulse detection signals is delivered on the electrical network inlet wire, simultaneously through current-limiting resistance; This pulse detection signals is also delivered to testing circuit; The pulse detection signals of electrical network inlet wire of flowing through becomes contrast signal, and testing circuit paired pulses detection signal and contrast signal are compared, and testing circuit is judged electrical network inlet wire state according to the amplitude or the wave form varies of contrast signal.Concrete, if the electrical network inlet wire exist equivalent resistance or equivalent capacity then pulse signal can produce decay to a certain degree, i.e. the amplitude of contrast signal or waveform generation decay to a certain degree, then testing circuit judges that electrical network inlet wire state be a net state also; If contrast signal shows as high-impedance state, then testing circuit judges that electrical network inlet wire state is the suspension state.Testing circuit is exported to next operating circuit to judgement signal (being the result of electrical network inlet wire state), is controlled the keying state of back-up source by this operating circuit.
Above-mentioned pulse detection signals can be made up of one or more pulses.
According to above-mentioned principle, the implementation procedure of present embodiment is detailed with concrete application example below.
Application example one
As shown in Figure 2, testing circuit comprises current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit, and current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit electrically connect successively; The current limiting pressure-limiting circuit is connected across between two electrical network inlet wires; The pulse detection signals that signal generator produces is sent comparator circuit to, and signal generator also produces a latch signal and gives latch cicuit.The current limiting pressure-limiting circuit is used to protect comparator circuit.Integrating circuit is used to eliminate circuit to be disturbed.
The course of work is: during outage, the pulse detection signals that signal generator produces is sent in electrical network inlet wire L and the comparator circuit simultaneously, and simultaneously, signal generator also produces a latch signal and gives latch cicuit.Comparator circuit is compared to contrast signal and pulse detection signals, and gives latch cicuit the signal after the comparison, and latch cicuit is the stable judgement signal of output under the control of latch signal then.
Application example two
As shown in Figure 3; Signal generator and testing circuit are integrated in the circuit that is made up of current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer, driving circuit; Current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer electrically connect successively; Single-chip microcomputer also electrically connects through driving circuit and current-limiting resistance, and the current limiting pressure-limiting circuit is connected across between two electrical network inlet wires; Pulse detection signals is produced by single-chip microcomputer, and pulse detection signals and contrast signal are compared by single-chip microcomputer.
The course of work is: owing to adopted single-chip microcomputer, so the generation of pulse detection signals and judgment processing etc. all realize through software in single-chip microcomputer inside.The pulse detection signals that single-chip microcomputer produces is just delivered on the electrical network inlet wire L through current-limiting resistance after overdrive circuit is isolated.Contrast signal through the current limiting pressure-limiting circuit after analog to digital conversion circuit be converted into and just deliver to single-chip microcomputer after the digital signal and judge and handle.Single-chip microcomputer is externally exported the judgement signal.
Because present embodiment adopts the burst detection mode, as long as coordinate assay intervals and output power, even a large amount of testing circuit and connect also and can not produce the phase mutual interference influences its normal detection.For a large amount of light fixtures and the system that connects, have a good application prospect like street lamp, market, office space, factory etc.
In addition, the outage automatic identification circuit of present embodiment can be used in before the rectification or after the rectification, not influence the detection effect of present embodiment, and the scope of application is wider.
For a person skilled in the art, can make other various corresponding changes and distortion, and these all changes and distortion should belong within the protection domain of the utility model claim all according to the technical scheme and the design of above description.
Claims (3)
1. the outage automatic identification circuit is characterized in that, comprises signal generator, current-limiting resistance and testing circuit; Testing circuit is connected across between two electrical network inlet wires, and an electrical network inlet wire in two electrical network inlet wires is through current-limiting resistance and signal generator electric connection, and signal generator also electrically connects with testing circuit.
2. outage automatic identification circuit as claimed in claim 1; It is characterized in that; Said testing circuit comprises current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit, and current limiting pressure-limiting circuit, comparator circuit, integrating circuit, latch cicuit electrically connect successively; The current limiting pressure-limiting circuit is connected across between two electrical network inlet wires.
3. outage automatic identification circuit as claimed in claim 1; It is characterized in that; Signal generator and testing circuit are integrated in the circuit that is made up of current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer, driving circuit; Current limiting pressure-limiting circuit, analog to digital conversion circuit, single-chip microcomputer electrically connect successively, and single-chip microcomputer also electrically connects through driving circuit and current-limiting resistance, and the current limiting pressure-limiting circuit is connected across between two electrical network inlet wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205486431U CN202421401U (en) | 2011-12-22 | 2011-12-22 | Automatic power failure identification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205486431U CN202421401U (en) | 2011-12-22 | 2011-12-22 | Automatic power failure identification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421401U true CN202421401U (en) | 2012-09-05 |
Family
ID=46746153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205486431U Expired - Fee Related CN202421401U (en) | 2011-12-22 | 2011-12-22 | Automatic power failure identification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202421401U (en) |
-
2011
- 2011-12-22 CN CN2011205486431U patent/CN202421401U/en not_active Expired - Fee Related
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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: 20120905 Termination date: 20141222 |
|
| EXPY | Termination of patent right or utility model |