A kind of voltage detecting alarm module
Technical field
Whether the utility model relates to voltage check device, relate in particular to a kind ofly can indicate tested voltage fast and exceed standard, and provide the voltage detecting alarm module of warning when tested voltage exceeds standard.
Background technology
There are many power panels to be now, the detection operation of one detection power panel output voltage is arranged after power panel is carried out by pipelining production.Present detection method is: at power panel voltage test points is set, and the below of test point contact thimble, the other end welding lead of thimble causes voltmeter head, and the magnitude of voltage that the visual gauge outfit of test man shows is judged the quality of power panel.
Existing testing tool and detection method activity duration on streamline are long, and it is many to detect power panel quantity, and it is uninteresting to work, and when test pressure is big, cause mistake to be surveyed easily, and this is the technical matters that industry needs to be resolved hurrily.
The utility model content
Whether the utility model is the problems referred to above that will solve prior art, propose a kind ofly can indicate tested voltage fast and exceed standard, and provide the voltage detecting alarm module of warning when tested voltage exceeds standard.
For solving the problems of the technologies described above, the technical scheme that the utility model proposes is a kind of voltage detecting alarm module of design, comprise the voltage input end that is electrically connected with circuit-under-test plate check point, the earth terminal that is electrically connected with circuit-under-test plate ground wire, positive source, it also comprises, the reference voltage module of upper voltage limit and lower voltage limit is provided; The input voltage of voltage input end and upper voltage limit and lower voltage limit are compared, when input voltage is higher than upper voltage limit or is lower than lower voltage limit, send the window comparison module of alerting signal, be subjected to alerting signal control to send the alarm module of the indication of reporting to the police.
Described reference voltage module comprises: be serially connected in first resistance and second resistance between positive source and the earth terminal, the link of first resistance and second resistance is exported described upper voltage limit; Be serially connected in the 3rd resistance and the 4th resistance between positive source and the earth terminal, the link of the 3rd resistance and the 4th resistance is exported described lower voltage limit.
Described window comparison module comprises: first and second operational amplifier and first and second diode, the inverting input of first operational amplifier connects described upper voltage limit, the in-phase input end of second operational amplifier connects described lower voltage limit, the inverting input of the in-phase input end of first operational amplifier and second operational amplifier also connects described voltage input end, the anode of output termination first diode of first operational amplifier, the anode of output termination second diode of second operational amplifier, the negative electrode of first and second diode connect together and export described alerting signal.
Described alarm module comprises triode, and the base stage of triode connects described alerting signal by the 5th resistance, is connected in series light emitting diode and current-limiting resistance between the collector of triode and the described positive source, and the emitter of triode connects earth terminal.
Described first resistance, second resistance, the 3rd resistance and the 4th resistance are adjustable resistance.
Compared with prior art, use test man of the present utility model need not read the magnitude of voltage that voltage table shows, also need not write down the allowed band of tested voltage, the magnitude of voltage and the allowed band that do not need to detect are made comparisons, and only need to reject the damage power panel according to alerting signal.Greatly alleviated test man's labour intensity, improved detection efficiency and detected accuracy rate.Because testing circuit does not have the voltmeter head of display voltage value, reduced whole cost simultaneously.
Description of drawings
Below in conjunction with drawings and Examples the utility model is made detailed explanation, wherein:
Fig. 1 is a functional-block diagram of the present utility model;
Fig. 2 is the circuit diagram of the utility model preferred embodiment.
Embodiment
Referring to Fig. 1, the disclosed voltage detecting alarm module of the utility model comprises the voltage input end that is electrically connected with circuit-under-test plate check point, with the earth terminal that circuit-under-test plate ground wire is electrically connected, positive source.It also comprises: the reference voltage module that upper voltage limit and lower voltage limit are provided; The input voltage of voltage input end and upper voltage limit and lower voltage limit are compared, when input voltage is higher than upper voltage limit or is lower than lower voltage limit, send the window comparison module of alerting signal, be subjected to alerting signal control to send the alarm module of the indication of reporting to the police.
Referring to Fig. 2, in preferred embodiment, described reference voltage module comprises: be serially connected in first resistance R 1 between positive source and the earth terminal and the link of second resistance R, 1 ', the first resistance R 1 and second resistance R 1 ' and export described upper voltage limit; Be serially connected in the 3rd resistance R 2 and the 4th resistance R 2 ' between positive source and the earth terminal, the link of the 3rd resistance R 2 and the 4th resistance R 2 ' is exported described lower voltage limit.Described window comparison module comprises: first, two operational amplifiers and first, two diodes, the inverting input of first operational amplifier A 1 connects described upper voltage limit, the in-phase input end of second operational amplifier A 2 connects described lower voltage limit, the inverting input of the in-phase input end of first operational amplifier and second operational amplifier also connects described voltage input end, the anode of the output termination first diode D1 of first operational amplifier, the anode of the output termination second diode D2 of second operational amplifier, first, the negative electrode of two diodes connects together and exports described alerting signal.Described alarm module comprises triode Q1, and the base stage of triode connects described alerting signal by the 5th resistance R 3, is connected in series light emitting diode and current-limiting resistance R4, the emitter connection earth terminal of triode between the collector of triode and the described positive source.
In other embodiments, for adapting to different power panels, upper voltage limit and lower voltage limit can be adjusted, and described first resistance R 1, second resistance R 1 ', the 3rd resistance R 2 and the 4th resistance R 2 ' are adjustable resistance.
At each check point of power panel (output terminal) thimble is set during use, the other end welding lead of thimble causes voltage input end of the present utility model, and the ground wire of power panel causes earth terminal of the present utility model by the thimble and the lead of correspondence.Referring to Fig. 2, first resistance R 1 and second resistance R 1 ' are formed bleeder circuit, are first operational amplifier A, 1 capping comparative level U1; The 3rd resistance R 2 and the 4th resistance R 2 ' are formed bleeder circuit, are that second operational amplifier A 2 is set lower limit comparative level U2.Input voltage Ui is added to the in-phase input end of A1 and the inverting input of A2 simultaneously.As Ui during greater than upper limit comparative level U1, first operational amplifier A, 1 output high level, otherwise, output low level; As Ui during less than lower limit comparative level U2, second operational amplifier A, 2 output high level, otherwise, output low level; When any one high level output was arranged, light-emitting diodes (LED) all can be lighted, and the test man knows that promptly current tested power panel has problem.
Above embodiment is only for illustrating non-providing constraints.Anyly do not break away from spirit of the present invention and category, and, all should be contained among the application's the claim scope its equivalent modifications of carrying out or change.