CN103713238B - The double-colored trouble indicator that warning current value can be established - Google Patents

The double-colored trouble indicator that warning current value can be established Download PDF

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Publication number
CN103713238B
CN103713238B CN201410013660.3A CN201410013660A CN103713238B CN 103713238 B CN103713238 B CN 103713238B CN 201410013660 A CN201410013660 A CN 201410013660A CN 103713238 B CN103713238 B CN 103713238B
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value
signal
circuit
current value
processing unit
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CN103713238A (en
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武建辉
高世佳
陈未远
刘显峰
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BEIJING HYLITON POWER TECHNOLOGY Co Ltd
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BEIJING HYLITON POWER TECHNOLOGY Co Ltd
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Abstract

The present invention relates to the double-colored trouble indicator that a kind of current value of reporting to the police can be established, comprise warning current settings switch and the current sensing elements being electrically connected successively by signal transfer direction, signal conditioning circuit, processing unit and optical signal generation circuit, processing unit comprises: A/D converter, carries out digitizing for the voltage signal exported by signal conditioning circuit; Comparer, for being compared by described voltage signal, judges its threshold wake-up value whether exceeding setting, as exceeded threshold wake-up value, and wake-up CPU; CPU, for controlling A/D converter work, calculates the digitized result of A/D converter, and as being judged as, fault then sends fault indication control signal, and this control signal triggering optical signal generation circuit sends optical signal and carries out instruction of reporting to the police. The present invention have high precision, low-power consumption, warning current value can many grades of positions accurately set, the LED of multi-output mode indicate feature, user can realize arranging flexibly according to line load levels of current.

Description

The double-colored trouble indicator that warning current value can be established
Technical field
The present invention relates to a kind of electrical accident telltale, in particular to the trouble indicator that a kind of current value of reporting to the police can set.
Background technology
Electrical system adopts usually trouble indicator the electrical accidents such as the short circuit occurred in system power netting twine road, ground connection, open circuit detected and provide to report to the police to indicate, it is generally the current value of logical over-current sensor detection line, when the current value of detected circuit sends instruction of reporting to the police when improper scope. As shown in Figure 1, mostly current sense device under prior art is analog quantity current sense device, alarm threshold value is arranged in analog trigger circuitry, this threshold value is corresponding with the resistance in put in circuit, usually adopting potentiometer to serve as resistance, to realize resistance adjustable simultaneously, thus change alarm threshold value, but this kind regulates and is difficult to hold whether the resistance regulating after potential device put in circuit is the value really wanting setting, cause alarm threshold value accommodation accuracy and precision all lower, it is easy to flase alarm when causing not reporting to the police and should not reporting to the police when this warning.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, it is an object of the invention to provide the double-colored trouble indicator that a kind of current value of reporting to the police can be established, the warning current value of this trouble indicator has multiple shelves position, and each grade of position can accurately locate, user can realize arranging flexibly according to line load levels of current.
The technical scheme of the present invention is: the double-colored trouble indicator that a kind of current value of reporting to the police can be established, and comprising: current sensing elements, for the electric current responded on test line, namely obtains tested electric current signal; Signal conditioning circuit is positive voltage signal for described tested electric current signal converts to amplitude; Processing unit, for being compared by the voltage signal after conditioning, judges whether to exceed the threshold wake-up value of setting, as exceeded threshold wake-up value, then described voltage signal sampled and calculated, then carrying out breakdown judge, if it is determined that fault, then send fault indication control signal; Optical signal generation circuit, for sending optical signal when receiving described fault indication control signal; Warning current settings switch, for carrying out the setting of warning current value in a compiled manner, the size of described threshold wake-up value depends on the size of described warning current value;
Wherein, described processing unit comprises: A/D converter, for described voltage signal is carried out digitizing; Comparer, for being compared by described voltage signal, judges its described threshold wake-up value whether exceeding setting, such as threshold wake-up value as described in exceeding, and wake-up CPU; CPU, for controlling the work of described A/D converter, calculates the digitized result of described A/D converter, determines whether fault, be, send described fault indication control signal.
The preferred mode of operation of described processing unit is: when described comparer wakes described CPU up, the comparison of described voltage signal is stopped by described comparer, described CPU controls described A/D converter and is sampled by described voltage signal, and carry out the calculating of sample waveform virtual value, when the virtual value of the sample waveform judging described voltage signal is no more than alarm threshold value in preset time period, then described CPU enters dormant state, and described comparer starts the comparison to described voltage signal again; Once the virtual value judging the sample waveform of described voltage signal exceedes described alarm threshold value in preset time period, then described CPU sends described fault indication control signal, and the size of described alarm threshold value depends on the size of described warning current value.
Described optical signal generation circuit can be connected with pilot lamp through optical fiber, panel unit, described panel unit can comprise the optical signal detecting circuit, central processing unit and the LED drive circuit that are electrically connected successively by signal transfer direction, described pilot lamp can comprise the different LED pilot lamp of two groups of colors, and these two groups of LED pilot lamp export corresponding to the separate two-way of described LED drive circuit.
Described panel unit can also be provided with rly. driving circuit, and the input terminus of described rly. driving circuit connects described central processing unit.
Described panel unit can also comprise input unit and input detecting circuit, the output of described input unit connects described input detecting circuit, the output of described input detecting circuit accesses described central processing unit, described input unit can comprise self-inspection input unit and/or the input unit that resets, and the input unit of described input unit can be button and/or remote input terminal.
To the double-colored trouble indicator that aforementioned warning current value described in any one can be established, when described central processing unit judges line fault, send to described LED drive circuit and make the control signal that wherein one group of LED pilot lamp is lighted; When described central processing unit judges that panel is in self-inspection state, send the control signal that another group LED pilot lamp is lighted to described LED drive circuit.
To the double-colored trouble indicator that aforementioned warning current value described in any one can be established, described warning current settings switch preferably adopts and dials code switch.
To the double-colored trouble indicator that aforementioned warning current value described in any one can be established, described threshold wake-up value is lower than described alarm threshold value, it is preferable to the 90-99% of described alarm threshold value.
To the double-colored trouble indicator that aforementioned warning current value described in any one can be established, described signal conditioning circuit preferably includes sampling resistance, DC partial voltage resistor network and non-inverting amplifier circuit, described DC partial voltage resistor network comprises by the first resistance, the T-shaped branch road that 2nd resistance and the 3rd resistance are formed by connecting, three external contacts of described T-shaped branch road are according to order called after first contact respectively of the resistance in affiliated branch path separately, 2nd contact and the 3rd contact, described first contact connects the positive terminal of direct supply, described 2nd contact ground connection, described 3rd contact connects the in-phase input end of described non-inverting amplifier circuit, one end ground connection of described sampling resistance, the other end connects the in-phase input end of described non-inverting amplifier circuit, two output terminals of described current sensing elements connect the two ends of described sampling resistance respectively.
Described signal conditioning circuit can also comprise isolation resistance, and described isolation resistance is arranged on the connection line between the in-phase input end of described sampling resistance and described non-inverting amplifier circuit.
The useful effect of the present invention is: owing to adopting warning current settings switch, particularly dial a yard switch, it is achieved that many grades of position settings of warning current value, and thus, warning current value can be arranged flexibly by user according to line load levels of current; Owing to being provided with the LED deixis of two kinds of different output patterns, it is very easy to the differentiation that related personnel carries out Auto-Sensing Mode and alarm mode; Owing to adopting the processing unit based on digital processing, and combine the signal conditioning circuit matched, constitute digital current sense device, compared to traditional sensor realized based on mimic channel, not only warning electric current can be arranged flexibly, debug process is more simple, reliable, and significantly improves accuracy of detection owing to sampling, and therefore makes the judgement precision to fault current be significantly improved.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of current sense device under prior art;
Fig. 2 is the functional block diagram of the current sense device of the present invention;
Fig. 3 is the functional block diagram of the trouble indicator of the present invention;
Fig. 4 is the schematic circuit diagram of the signal conditioning circuit of the present invention.
Embodiment
The present invention discloses the double-colored trouble indicator that a kind of current value of reporting to the police can be established, and see Fig. 2, comprising: current sensing elements, for the electric current responded on test line, it converts the electric current signal of small magnitude to, namely obtains tested electric current signal; Signal conditioning circuit is positive voltage signal for described tested electric current signal converts to amplitude; Processing unit, for being compared by the voltage signal after conditioning, judges whether to exceed the threshold wake-up value of setting, as exceeded threshold wake-up value, then described voltage signal sampled and calculated, then carrying out breakdown judge, if it is determined that fault, then send fault indication control signal; Optical signal generation circuit, the visible ray for generation of certain pulsewidth exports, and to realize instruction of reporting to the police, the triggering signal of described optical signal generation circuit is described fault indication control signal; Warning current settings switch, for carrying out the setting of warning current value in a compiled manner, it is preferred to use dials code switch. The size of described threshold wake-up value depends on the size of described warning current value. Described current sensing elements, signal conditioning circuit, processing unit, optical signal generation circuit and warning current settings switch constitute digital current sense device, also being equivalent to a trouble indicator, warning current settings switch is fixed on the shell of this current sense device. The electric current of this current sense device detection electric power circuit, after electric current exceedes the warning Sharp criteria of setting, produces optical signal as warning instruction.
Wherein, described processing unit comprises: A/D converter, for described voltage signal is carried out digitizing; Comparer, for being compared by described voltage signal, judges its described threshold wake-up value whether exceeding setting, such as threshold wake-up value as described in exceeding, and wake-up CPU; CPU, for controlling the work of described A/D converter, calculates the digitized result of described A/D converter, judges whether test line exists fault, be, send described fault indication control signal. Described CPU is also for converting the output of described warning current settings switch to described threshold wake-up value and alarm threshold value. Described processing unit both can be the one chip with high integration degree, it is also possible to be the circuit connection combination of multiple different functional chips independent separately.
The preferred mode of operation of described processing unit is: under normality, described voltage signal after conditioning is compared by described comparer, once judge that described voltage signal exceedes threshold wake-up value, described comparer wakes described CPU up, the comparison of described voltage signal is stopped by described comparer, described CPU controls described A/D converter and described voltage signal is carried out Microsecond grade sampling, as the basis significantly improving detection and alarm accuracy, sampled result is calculated (as calculated momentary value by CPU, also the average in for some time can be calculated), calculation result is referred to as calculated value, as optimal way, calculating sampled result carried out is the virtual value of calculating sampling waveform, correspondingly, described calculated value then can be called the virtual value of sample waveform. when judging that described calculated value is no more than alarm threshold value in preset time period, then described CPU enters dormant state, and described comparer starts the comparison to described voltage signal again, once judge that described calculated value exceedes described alarm threshold value in preset time period, then described CPU sends described fault indication control signal. the size of described alarm threshold value depends on the size of described warning current value.
User is according to the corresponding relation between the warning current value pre-set and coding, by the coding that described warning current settings switch-linear hybrid is corresponding with selected warning current value, due to for already present current sense device, the physical structure of its circuit and relevant parameter are (such as the change ratio of current transformer, the magnification etc. of non-inverting amplifier circuit) it has been determined that, therefore, between alarm threshold value and warning current value, existence is determined, and by calculating known corresponding relation, also namely set a certain coding and namely may correspond to certain alarm threshold value, and, in order to realize described comparer waking up in advance described CPU, described threshold wake-up value is arranged to lower than described alarm threshold value by the present invention, it is preferably the 90-99% of described alarm threshold value. turn again after waking up and sample by CPU control A/D converter, complete by CPU to calculate and judge, owing to the precision of A/D converter is far away higher than comparer, therefore compared to the conventional current sensor adopting comparer to carry out breakdown judge, judge that precision obtains pole and significantly improves, simultaneously owing to CPU just carries out the sampling of high precision, compares after being waken up, low-power consumption requirement therefore can also be met.
As shown in Figure 4, described signal conditioning circuit comprises sampling resistance R3, DC partial voltage resistor network and non-inverting amplifier circuit (comprise amplifier UI, feedback resistance R1, input resistance R6, single power Vcc), described DC partial voltage resistor network comprises by the first resistance R4, the T-shaped branch road that 2nd resistance R8 and the 3rd resistance R7 is formed by connecting, three external contacts of described T-shaped branch road are according to order called after first contact respectively of the resistance in affiliated branch path separately, 2nd contact and the 3rd contact, described first contact connects the positive terminal of direct supply Vcc, described 2nd contact ground connection, described 3rd contact connects the in-phase input end of described non-inverting amplifier circuit, one end ground connection of described sampling resistance, the other end connects the in-phase input end of described non-inverting amplifier circuit. two output terminals of described current sensing elements connect the two ends (two input terminuss IN+, IN-of signal conditioning circuit described in corresponding diagram 4) of described sampling resistance respectively. described sampling resistance is used for current sample, electric current exchanges signal and converts voltage exchange signal to, described non-inverting amplifier circuit is used for regulation output to the amplitude of the voltage signal of processing unit, by resistor network and amplifier, sampled voltage being carried out linear transformation and direct current component superposition, 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 the in-phase input end of described sampling resistance and described non-inverting amplifier circuit, and R5 resistance is relatively big, damages amplifier for preventing from impacting. the output VSAMP of described non-inverting amplifier circuit is described voltage signal.
The present invention adopts above-mentioned digital electric flow sensor, compared to the current sense device adopting rectification bridge and sampling capacitance scheme under prior art, owing to avoiding uncontrollable rectification bridge pressure drop of temperature influence, further increases accuracy of detection.
As shown in Figure 3, the double-colored trouble indicator that described warning current value can be established can also comprise panel unit and one or some pilot lamp, described optical signal generation circuit can be connected with pilot lamp via optical fiber, panel unit, and described panel unit can comprise the optical signal detecting circuit, central processing unit and the LED drive circuit that are electrically connected successively by signal transfer direction. when the described pilot lamp of the some small cups of employing, it is preferred to use the LED pilot lamp that two groups of colors are different, these two groups of LED pilot lamp are connected respectively the separate two-way in described LED drive circuit and export. described panel unit can also be provided with rly. driving circuit, and the input terminus of described rly. driving circuit connects described central processing unit. described panel unit can also comprise input unit and input detecting circuit, the output of described input unit connects described input detecting circuit, the output of described input detecting circuit accesses described central processing unit, described input unit can comprise self-inspection input unit and/or the input unit that resets, the input unit of described input unit can be button and/or remote input terminal, the actuation of keys of input detecting circuit detection panel and/or the distant place input signal of remote input terminal, and transmit signals to central processing unit, realize self-inspection or the reset function of trouble indicator.
The visible ray of described optical signal generation circuit exports by the optical signal detecting circuit of Optical Fiber Transmission to panel unit, and the optical signal inputted is carried out inputing to central processing unit after opto-electronic conversion becomes voltage signal by optical signal detecting circuit. from front literary composition, when the described processing unit of current sense device judges that described calculated value exceedes described alarm threshold value, described for control optical signal generation circuit is sent optical signal and reports to the police by its CPU, and this optical signal through described Optical Fiber Transmission to panel unit, detected by described optical signal detecting circuit again and input to central processing unit after converting voltage signal to, therefore, when described central processing unit receives the voltage signal with certain amplitude from described optical signal detecting circuit, mean that detected circuit there occurs fault (be namely equivalent to described central processing unit and judge line fault), then described central processing unit sends to described LED drive circuit and makes the control signal that wherein one group of LED pilot lamp is lighted, also can send the control signal of relay action to described rly. driving circuit according to program setting simultaneously, rly. driving circuit receives the control signal from central processing unit, perform corresponding set or reset action, when described central processing unit judges that panel is in self-inspection state, the control signal that another group LED pilot lamp is lighted is sent to described LED drive circuit, each group of LED pilot lamp can be one or many, when enter self-inspection state to be controlled by self-inspection input unit input by user, it is also possible to automatically control by pre-set programs.
In the present embodiment, two groups of LED pilot lamp can be red group LED pilot lamp and green group LED pilot lamp, and when described central processing unit judges line fault, described LED drive circuit sends to redness group LED pilot lamp and lights indicator signal; When described central processing unit judges that panel unit is in self-inspection state, LED drive circuit sends to green group LED pilot lamp and lights indicator signal.

Claims (9)

1. the double-colored trouble indicator that a current value of reporting to the police can be established, it is characterised in that comprising:
Current sensing elements, for the electric current responded on test line, namely obtains tested electric current signal;
Signal conditioning circuit is positive voltage signal for described tested electric current signal converts to amplitude;
Processing unit, for being compared by the voltage signal after conditioning, judges whether to exceed the threshold wake-up value of setting, as exceeded threshold wake-up value, then described voltage signal sampled and calculated, then carrying out breakdown judge, if it is determined that fault, then send fault indication control signal;
Optical signal generation circuit, for sending optical signal when receiving described fault indication control signal;
Warning current settings switch, for carrying out the setting of warning current value in a compiled manner, the size of described threshold wake-up value depends on the size of described warning current value;
Wherein, described processing unit comprises:
A/D converter, for carrying out digitizing to described voltage signal;
Comparer, for being compared by described voltage signal, judges its described threshold wake-up value whether exceeding setting, such as threshold wake-up value as described in exceeding, and wake-up CPU;
CPU, for controlling the work of described A/D converter, calculates the digitized result of described A/D converter, determines whether fault, be, send described fault indication control signal;
The mode of operation of described processing unit is: when described comparer wakes described CPU up, the comparison of described voltage signal is stopped by described comparer, described CPU controls described A/D converter and is sampled by described voltage signal, and carry out the calculating of sample waveform virtual value, when the virtual value of the sample waveform judging described voltage signal is no more than alarm threshold value in preset time period, then described CPU enters dormant state, and described comparer starts the comparison to described voltage signal again; Once the virtual value judging the sample waveform of described voltage signal exceedes described alarm threshold value in preset time period, then described CPU sends described fault indication control signal, and the size of described alarm threshold value depends on the size of described warning current value.
2. the double-colored trouble indicator that warning current value as claimed in claim 1 can be established, it is characterized in that described optical signal generation circuit is connected with pilot lamp through optical fiber, panel unit, described panel unit comprises the optical signal detecting circuit, central processing unit and the LED drive circuit that are electrically connected successively by signal transfer direction, described pilot lamp comprises the different LED pilot lamp of two groups of colors, and these two groups of LED pilot lamp export corresponding to the separate two-way of described LED drive circuit.
3. the double-colored trouble indicator that warning current value as claimed in claim 2 can be established, it is characterised in that described panel unit is also provided with rly. driving circuit, and the input terminus of described rly. driving circuit connects described central processing unit.
4. the double-colored trouble indicator that warning current value as claimed in claim 3 can be established, it is characterized in that described panel unit also comprises input unit and input detecting circuit, the output of described input unit connects described input detecting circuit, the output of described input detecting circuit accesses described central processing unit, described input unit comprises self-inspection input unit and/or the input unit that resets, and the input unit of described input unit is button and/or remote input terminal.
5. the double-colored trouble indicator that warning current value as described in claim 2,3 or 4 can be established, it is characterised in that when described central processing unit judges line fault, send to described LED drive circuit and make the control signal that wherein one group of LED pilot lamp is lighted; When described central processing unit judges that panel is in self-inspection state, send the control signal that another group LED pilot lamp is lighted to described LED drive circuit.
6. the double-colored trouble indicator that warning current value as claimed in claim 5 can be established, it is characterised in that described warning current settings switch adopts dials code switch.
7. the double-colored trouble indicator that warning current value as claimed in claim 6 can be established, it is characterised in that described threshold wake-up value is lower than described alarm threshold value.
8. the double-colored trouble indicator that warning current value as claimed in claim 7 can be established, it is characterized in that described signal conditioning circuit comprises sampling resistance, DC partial voltage resistor network and non-inverting amplifier circuit, described DC partial voltage resistor network comprises by the first resistance, the T-shaped branch road that 2nd resistance and the 3rd resistance are formed by connecting, three external contacts of described T-shaped branch road are according to order called after first contact respectively of the resistance in affiliated branch path separately, 2nd contact and the 3rd contact, described first contact connects the positive terminal of direct supply, described 2nd contact ground connection, described 3rd contact connects the in-phase input end of described non-inverting amplifier circuit, one end ground connection of described sampling resistance, the other end connects the in-phase input end of described non-inverting amplifier circuit, two output terminals of described current sensing elements connect the two ends of described sampling resistance respectively.
9. the double-colored trouble indicator that warning current value as claimed in claim 8 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 the in-phase input end of described sampling resistance and described non-inverting amplifier circuit.
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