CN103713238A - Alarm current value settable bi-color fault indicator - Google Patents
Alarm current value settable bi-color fault indicator Download PDFInfo
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Abstract
The invention relates to an alarm current value settable bi-color fault indicator which comprises an alarm current setting switch, a current sensing element, a signal conditioning circuit, a processing unit and an optical signal generating circuit, wherein the current sensing element, the signal conditioning circuit, the processing unit and the optical signal generating circuit are sequentially and electrically connected in the signal transmitting direction. The processing unit comprises an A/D converter for digitalizing voltage signals output by the signal conditioning circuit, a comparator for comparing voltage signals, judging whether the voltage signals exceed a set awakening threshold value and then triggering and awakening a CPU if the voltage signals exceed the set awakening threshold value, and the CPU for controlling work of the A/D converter, calculating a digitalization result of the A/D converter and sending a fault indication control signal if the digitalization result shows that a fault is produced, wherein the control signal triggers the optical signal generating circuit to send an optical signal and give an alarm indication. The alarm current value settable bi-color fault indicator has the LED indication advantages of being high in accuracy, low power consumption, capable of achieving accurate multi-gear setting of alarm current values and various in output mode, and a user can perform flexible setting according to line load current level.
Description
Technical field
The present invention relates to a kind of electric fault indicator, the fault detector that particularly a kind of alarm current value can be set.
Background technology
In electrical system, conventionally adopt fault detector to detect and provide to the short circuit, the ground connection that occur in system power netting twine road, the electric fault such as open circuit the indication of reporting to the police, generally by the current value of current sensor detection line, when the current value of detected circuit sends the indication of reporting to the police during in improper scope.As shown in Figure 1, mostly current sensor under prior art is analog quantity current sensor, alarm threshold value arranges in analog trigger circuitry, this threshold value is corresponding with the resistance in place in circuit, conventionally adopting potentiometer to serve as resistance, to realize resistance adjustable simultaneously, thereby change alarm threshold value, but this adjusting is difficult to hold and regulates whether the resistance of afterpotential device place in circuit is the value of really wanting setting, cause alarm threshold value accommodation accuracy and precision all lower, false alarm while easily causing not reporting to the police and should not reporting to the police in the situation of this warning.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the double-colored fault detector that the object of the present invention is to provide a kind of alarm current value to establish, the alarm current value of this fault detector has multiple gear, and each gear can accurately be located, user can realize flexibly and arranging according to line load levels of current.
Technical scheme of the present invention is: the double-colored fault detector that a kind of alarm current value can be established, comprising: current sensing elements, for responding to the electric current on test line, obtains tested current signal; Signal conditioning circuit is positive voltage signal for converting described tested current signal to amplitude; Processing unit, compares for the voltage signal to after conditioning, judges whether to surpass the threshold wake-up value of setting, as surpassed threshold wake-up value, described voltage signal is sampled and calculated, then carry out fault judgement, if the fault of being judged as, sends indicating fault control signal; Light signal circuit for generating, for sending light signal when receiving described indicating fault control signal; Alarm current configuration switch, for carry out the setting of alarm current value with coded system, the size of described threshold wake-up value depends on the size of described alarm current value;
Wherein, described processing unit comprises: A/D converter, for described voltage signal is carried out to digitizing; Comparer, for described voltage signal is compared, judges whether it exceeds the described threshold wake-up value of setting, as threshold wake-up value as described in exceeding, wake-up CPU; CPU, for controlling described A/D converter work, calculates the digitized result of described A/D converter, determines whether fault, is to send described indicating fault control signal.
The preferred working method of described processing unit is: when described comparer wakes described CPU up, described comparer relatively stops described voltage signal, described CPU controls described A/D converter described voltage signal is sampled, and carry out the calculating of sample waveform effective value, the effective value of working as the sample waveform of the described voltage signal of judgement in Preset Time section is no more than alarm threshold value, described CPU enters dormant state, and described comparer starts the comparison to described voltage signal again; Once judge that in Preset Time section the effective value of the sample waveform of described voltage signal surpasses described alarm threshold value, described CPU sends described indicating fault control signal, the size of described alarm threshold value depends on the size of described alarm current value.
Described light signal circuit for generating can be connected with pilot lamp through optical fiber, panel unit, described panel unit can comprise optical signal detecting circuit, CPU (central processing unit) and the LED drive circuit being electrically connected to successively by signal transfer direction, described pilot lamp can comprise two groups of LED light that color is different, and these two groups of LED light are corresponding to the separate two-way output of described LED drive circuit.
Described panel unit can also be provided with relay drive circuit, and the input end of described relay drive circuit connects described CPU (central processing unit).
Described panel unit can also comprise input block and input detecting circuit, the output of described input block connects described input detecting circuit, the output of described input detecting circuit accesses described CPU (central processing unit), described input block can comprise self check input block and/or reset input block, and the input media of described input block can be button and/or remote input terminal.
The double-colored fault detector that can establish aforementioned alarm current value described in any one, when described CPU (central processing unit) is judged line fault, sends and makes wherein one group of control signal that LED light is lighted to described LED drive circuit; Described CPU (central processing unit) is judged panel when self check state, sends the control signal that another group LED light is lighted to described LED drive circuit.
The double-colored fault detector that can establish aforementioned alarm current value described in any one, described alarm current configuration switch preferably adopts toggle switch.
The double-colored fault detector that can establish aforementioned alarm current value described in any one, described threshold wake-up value, lower than described alarm threshold value, is preferably the 90-99% of described alarm threshold value.
The double-colored fault detector that can establish aforementioned alarm current value described in any one, described signal conditioning circuit preferably includes sampling resistor, DC partial voltage resistor network and in-phase amplifier circuit, described DC partial voltage resistor network comprises by the first resistance, the T shape branch road that the second resistance and the 3rd resistance are formed by connecting, three external contacts of described T shape branch road divide the order of the resistance on branch road to distinguish called after the first contact under separately, the second contact and the 3rd contact, described the first contact connects the positive terminal of direct supply, described the second contact ground connection, described the 3rd contact connects the in-phase input end of described in-phase amplifier circuit, one end ground connection of described sampling resistor, the other end connects the in-phase input end of described in-phase amplifier circuit, two output terminals of described current sensing elements connect respectively the two ends of described sampling resistor.
Described signal conditioning circuit can also comprise isolation resistance, and described isolation resistance is arranged on the connection line between described sampling resistor and the in-phase input end of described in-phase amplifier circuit.
Beneficial effect of the present invention is: owing to adopting alarm current configuration switch, particularly toggle switch, realized many gears of alarm current value and set, thus, user can arrange alarm current value flexibly according to line load levels of current; Owing to being provided with the LED deixis of two kinds of different output modes, be very easy to the differentiation that related personnel carries out Auto-Sensing Mode and alarm mode; Due to the processing unit adopting based on digital processing, and in conjunction with the signal conditioning circuit matching, formed digital current sensor, than traditional sensor of realizing based on mimic channel, not only alarm current can arrange flexibly, debug process is more simple, reliable, and because sampling has significantly improved accuracy of detection, therefore makes the judgement precision of fault current be significantly improved.
Accompanying drawing explanation
Fig. 1 is the theory diagram of current sensor under prior art;
Fig. 2 is the theory diagram of current sensor of the present invention;
Fig. 3 is the theory diagram of fault detector of the present invention;
Fig. 4 is the circuit theory diagrams of signal conditioning circuit of the present invention.
Embodiment
The invention discloses the double-colored fault detector that a kind of alarm current value can be established, referring to Fig. 2, comprising: current sensing elements, for responding to the electric current on test line, the current signal of small magnitude to of converting, obtain tested current signal; Signal conditioning circuit is positive voltage signal for converting described tested current signal to amplitude; Processing unit, compares for the voltage signal to after conditioning, judges whether to surpass the threshold wake-up value of setting, as surpassed threshold wake-up value, described voltage signal is sampled and calculated, then carry out fault judgement, if the fault of being judged as, sends indicating fault control signal; Light signal circuit for generating, for generation of the visible ray output of certain pulsewidth, to realize the indication of reporting to the police, the trigger pip of described light signal circuit for generating is described indicating fault control signal; Alarm current configuration switch, for carry out the setting of alarm current value with coded system, preferably adopts toggle switch.The size of described threshold wake-up value depends on the size of described alarm current value.Described current sensing elements, signal conditioning circuit, processing unit, light signal circuit for generating and alarm current configuration switch have formed digital current sensor, also be equivalent to a fault detector, alarm current configuration switch is fixed on the shell of this current sensor.This current sensor detects the electric current of power circuit, when electric current surpasses after the warning Sharp criteria of setting, produces light signal as the indication of reporting to the police.
Wherein, described processing unit comprises: A/D converter, for described voltage signal is carried out to digitizing; Comparer, for described voltage signal is compared, judges whether it exceeds the described threshold wake-up value of setting, as threshold wake-up value as described in exceeding, wake-up CPU; CPU, for controlling described A/D converter work, calculates the digitized result of described A/D converter, judges whether test line exists fault, is to send described indicating fault control signal.Described CPU is also for converting the output of described alarm current configuration switch to described threshold wake-up value and alarm threshold value.Described processing unit can be both the one chip with high integration degree, can be also a plurality of independently circuit of difference in functionality chip connection combinations separately.
The preferred working method of described processing unit is: under normality, described comparer compares the described voltage signal after nursing one's health, once judge that described voltage signal surpasses threshold wake-up value, described comparer wakes described CPU up, described comparer relatively stops described voltage signal, described CPU controls described A/D converter described voltage signal is carried out to Microsecond grade sampling, as the basis that significantly improves detection and warning precision, CPU calculates (as calculated instantaneous value sampled result, also can calculate the average in a period of time), result of calculation is referred to as calculated value, as optimal way, the calculating that sampled result is carried out is the effective value of calculating sampling waveform, correspondingly, described calculated value can be described as the effective value of sample waveform.In Preset Time section, when the described calculated value of judgement is no more than alarm threshold value, described CPU enters dormant state, and described comparer starts the comparison to described voltage signal again; Once judge that in Preset Time section described calculated value surpasses described alarm threshold value, described CPU sends described indicating fault control signal.The size of described alarm threshold value depends on the size of described alarm current value.
User is according to the corresponding relation between the alarm current value pre-setting and coding, by the described alarm current configuration switch setting coding corresponding with selected alarm current value, due to for already present current sensor, the physical arrangement of its circuit and relevant parameter are (as the no-load voltage ratio of current transformer, the enlargement factor of in-phase amplifier circuit etc.) determine, therefore, between alarm threshold value and alarm current value, existence is determined, and by calculating known corresponding relation, also set a certain coding and get final product corresponding certain alarm threshold value, and, in order to realize described comparer waking up in advance described CPU, the present invention is arranged to described threshold wake-up value lower than described alarm threshold value, be preferably the 90-99% of described alarm threshold value.After waking up, turn again by CPU control A/D converter and sample, by CPU, complete and calculate and judgement, because the precision of A/D converter is far away higher than comparer, therefore than the conventional current sensor that adopts comparer to carry out fault judgement, judgement precision obtains the utmost point and significantly improves, because CPU is waken up rear just carry out high-precision sampling, comparison, therefore can also meet low-power consumption requirement simultaneously.
As shown in Figure 4, described signal conditioning circuit comprises sampling resistor R3, DC partial voltage resistor network and in-phase amplifier circuit (comprise amplifier UI, feedback resistance R1, input resistance R6, single supply Vcc), described DC partial voltage resistor network comprises by the first resistance R 4, the T shape branch road that the second resistance R 8 and the 3rd resistance R 7 are formed by connecting, three external contacts of described T shape branch road divide the order of the resistance on branch road to distinguish called after the first contact under separately, the second contact and the 3rd contact, described the first contact connects the positive terminal of direct supply Vcc, described the second contact ground connection, described the 3rd contact connects the in-phase input end of described in-phase amplifier circuit, one end ground connection of described sampling resistor, the other end connects the in-phase input end of described in-phase amplifier circuit.Two output terminals of described current sensing elements connect respectively the two ends (two of signal conditioning circuit input end IN+, IN-described in corresponding diagram 4) of described sampling resistor.Described sampling resistor, for current sample, converts electric current AC signal to voltage AC signal; Described in-phase amplifier circuit is the amplitude to the voltage signal of processing unit for regulation output; By resistor network with sampled voltage is carried out to linear transformation to amplifier and DC component superposes, making it to become amplitude is positive signal, so that processing unit processes.Described signal conditioning circuit can also comprise isolation resistance R5, and described isolation resistance is arranged on the connection line between described sampling resistor and the in-phase input end of described in-phase amplifier circuit, and R5 resistance is larger, for preventing impact failure amplifier.The output VSAMP of described in-phase amplifier circuit is described voltage signal.
The present invention adopts above-mentioned digital electric flow sensor, and the current sensor than adopting rectifier bridge and sampling capacitance scheme under prior art, owing to having avoided uncontrollable rectifier bridge pressure drop of temperature influence, has further improved accuracy of detection.
As shown in Figure 3, the double-colored fault detector that described alarm current value can be established can also comprise panel unit and one or some pilot lamp, described light signal circuit for generating can be connected with pilot lamp via optical fiber, panel unit, and described panel unit can comprise optical signal detecting circuit, CPU (central processing unit) and the LED drive circuit being electrically connected to successively by signal transfer direction.When adopting the described pilot lamp of some small cups, preferably adopt two groups of LED light that color is different, these two groups of LED light are connected respectively the separate two-way output in described LED drive circuit.Described panel unit can also be provided with relay drive circuit, and the input end of described relay drive circuit connects described CPU (central processing unit).Described panel unit can also comprise input block and input detecting circuit, the output of described input block connects described input detecting circuit, the output of described input detecting circuit accesses described CPU (central processing unit), described input block can comprise self check input block and/or reset input block, the input media of described input block can be button and/or remote input terminal, input detecting circuit detects the actuation of keys of panel and/or the distant place input signal of remote input terminal, and transmit signals to CPU (central processing unit), realize self check or the reset function of fault detector.
The optical signal detecting circuit of panel unit is arrived in the visible ray output of described light signal circuit for generating by Optical Fiber Transmission, optical signal detecting circuit carries out after opto-electronic conversion becomes voltage signal inputing to CPU (central processing unit) to the light signal of input.From above, when the described processing unit of current sensor judges that described calculated value surpasses described alarm threshold value, its CPU sends light alarm by the described light signal circuit for generating of control, and this light signal arrives panel unit through described Optical Fiber Transmission, after being detected and convert to voltage signal by described optical signal detecting circuit again, input to CPU (central processing unit), therefore, when described CPU (central processing unit) receive from described optical signal detecting circuit there is the voltage signal of certain amplitude time, mean that fault (be equivalent to described CPU (central processing unit) and judge line fault) has occurred detected circuit, described CPU (central processing unit) is sent and is made wherein one group of control signal that LED light is lighted to described LED drive circuit, also can to described relay drive circuit, send according to program setting the control signal of pilot relay action simultaneously, relay drive circuit receives the control signal from CPU (central processing unit), carry out corresponding set or homing action, when described CPU (central processing unit) is judged panel in self check state, to described LED drive circuit, send the control signal that another group LED light is lighted, each group LED light can be one or many, when entering self check state can be inputted to control by self check input block by user, also can automatically be controlled by pre-set programs.
In the present embodiment, two groups of LED light can be red group LED light and green group LED light, and when described CPU (central processing unit) is judged line fault, described LED drive circuit sends and lights indicator signal to redness group LED light; When described CPU (central processing unit) is judged panel unit in self check state, LED drive circuit sends and lights indicator signal to green group LED light.
Claims (10)
1. the double-colored fault detector that alarm current value can be established, is characterized in that comprising:
Current sensing elements, for responding to the electric current on test line, obtains tested current signal;
Signal conditioning circuit is positive voltage signal for converting described tested current signal to amplitude;
Processing unit, compares for the voltage signal to after conditioning, judges whether to surpass the threshold wake-up value of setting, as surpassed threshold wake-up value, described voltage signal is sampled and calculated, then carry out fault judgement, if the fault of being judged as, sends indicating fault control signal;
Light signal circuit for generating, for sending light signal when receiving described indicating fault control signal;
Alarm current configuration switch, for carry out the setting of alarm current value with coded system, the size of described threshold wake-up value depends on the size of described alarm current value;
Wherein, described processing unit comprises:
A/D converter, for carrying out digitizing to described voltage signal;
Comparer, for described voltage signal is compared, judges whether it exceeds the described threshold wake-up value of setting, as threshold wake-up value as described in exceeding, wake-up CPU;
CPU, for controlling described A/D converter work, calculates the digitized result of described A/D converter, determines whether fault, is to send described indicating fault control signal.
2. the double-colored fault detector that alarm current value as claimed in claim 1 can be established, the working method that it is characterized in that described processing unit is: when described comparer wakes described CPU up, described comparer relatively stops described voltage signal, described CPU controls described A/D converter described voltage signal is sampled, and carry out the calculating of sample waveform effective value, the effective value of working as the sample waveform of the described voltage signal of judgement in Preset Time section is no more than alarm threshold value, described CPU enters dormant state, described comparer starts the comparison to described voltage signal again, once judge that in Preset Time section the effective value of the sample waveform of described voltage signal surpasses described alarm threshold value, described CPU sends described indicating fault control signal, the size of described alarm threshold value depends on the size of described alarm current value.
3. the double-colored fault detector that alarm current value as claimed in claim 2 can be established, it is characterized in that described light signal circuit for generating is connected with pilot lamp through optical fiber, panel unit, described panel unit comprises optical signal detecting circuit, CPU (central processing unit) and the LED drive circuit being electrically connected to successively by signal transfer direction, described pilot lamp comprises two groups of LED light that color is different, and these two groups of LED light are corresponding to the separate two-way output of described LED drive circuit.
4. the double-colored fault detector that alarm current value as claimed in claim 3 can be established, is characterized in that described panel unit is also provided with relay drive circuit, and the input end of described relay drive circuit connects described CPU (central processing unit).
5. the double-colored fault detector that alarm current value as claimed in claim 4 can be established, it is characterized in that described panel unit also comprises input block and input detecting circuit, the output of described input block connects described input detecting circuit, the output of described input detecting circuit accesses described CPU (central processing unit), described input block comprises self check input block and/or reset input block, and the input media of described input block is button and/or remote input terminal.
6. the double-colored fault detector that the alarm current value as described in claim 3,4 or 5 can be established, while it is characterized in that described CPU (central processing unit) is judged line fault, sends and makes wherein one group of control signal that LED light is lighted to described LED drive circuit; Described CPU (central processing unit) is judged panel when self check state, sends the control signal that another group LED light is lighted to described LED drive circuit.
7. the double-colored fault detector that the alarm current value as described in claim 1,2,3,4,5 or 6 can be established, is characterized in that described alarm current configuration switch adopts toggle switch.
8. the double-colored fault detector that the alarm current value as described in claim 1,2,3,4,5,6 or 7 can be established, is characterized in that described threshold wake-up value is lower than described alarm threshold value.
9. as claim 1, 2, 3, 4, 5, 6, the double-colored fault detector that alarm current value described in 7 or 8 can be established, it is characterized in that described signal conditioning circuit comprises sampling resistor, DC partial voltage resistor network and in-phase amplifier circuit, described DC partial voltage resistor network comprises by the first resistance, the T shape branch road that the second resistance and the 3rd resistance are formed by connecting, three external contacts of described T shape branch road divide the order of the resistance on branch road to distinguish called after the first contact under separately, the second contact and the 3rd contact, described the first contact connects the positive terminal of direct supply, described the second contact ground connection, described the 3rd contact connects the in-phase input end of described in-phase amplifier circuit, one end ground connection of described sampling resistor, the other end connects the in-phase input end of described in-phase amplifier circuit, two output terminals of described current sensing elements connect respectively the two ends of described sampling resistor.
10. the double-colored fault detector that alarm current value as claimed in claim 9 can be established, it is characterized in that described signal conditioning circuit also comprises isolation resistance, described isolation resistance is arranged on the connection line between described sampling resistor and the in-phase input end of described in-phase amplifier circuit.
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Denomination of invention: Two color fault indicator with settable alarm current value Effective date of registration: 20210926 Granted publication date: 20160601 Pledgee: Beijing first financing Company limited by guarantee Pledgor: BEIJING HYLITON POWER TECHNOLOGY Co.,Ltd. Registration number: Y2021110000047 |
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