CN212483683U - Differential probe and front-mounted and rear-mounted independent alarm circuits - Google Patents
Differential probe and front-mounted and rear-mounted independent alarm circuits Download PDFInfo
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- CN212483683U CN212483683U CN202020927892.0U CN202020927892U CN212483683U CN 212483683 U CN212483683 U CN 212483683U CN 202020927892 U CN202020927892 U CN 202020927892U CN 212483683 U CN212483683 U CN 212483683U
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Abstract
The utility model discloses a differential probe and a front-mounted and rear-mounted independent alarm circuit, wherein the differential probe is internally and transversely provided with a circuit board, one end of the circuit board is provided with a forward differential signal measuring end and a reverse differential signal measuring end, and the other end of the circuit board is provided with a power supply interface; the circuit board is integrated with a preposed alarm circuit, and the preposed alarm circuit comprises: a forward voltage alarm circuit and a reverse voltage alarm circuit; the utility model discloses a rearmounted warning circuit and leading warning circuit mutually independent work, leading warning circuit need detect forward and reverse differential signal voltage respectively, and rearmounted warning circuit only detects to the voltage of single-ended output.
Description
Technical Field
The utility model relates to a measure technical field, specifically be a differential probe and leading, rearmounted independent alarm circuit.
Background
The differential probe is usually used for measuring higher voltage, but the high voltage can cause damage to the internal circuit of the differential probe in different degrees, and when the measured voltage is abnormal, an alarm circuit needs to give an alarm, for example, in the utility model patent with application number 201620721469.9, the zero-clearing alarm is arranged at the output end to detect and alarm the large voltage;
the existing alarm circuit is usually designed at the output end of the circuit to form an output alarm circuit, but for a differential probe, when the differential probe is used for measuring voltage, the front end part needs to respectively detect and design the alarm circuit according to forward and reverse differential signal voltage, and the rear end part needs to detect and design the alarm circuit according to the voltage of a single-ended output end;
the prior art can not meet the requirements of people at the present stage, and the prior art is urgently needed to be reformed based on the current situation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a differential probe and leading, rearmounted independent alarm circuit to solve the problem that proposes among the above-mentioned background art.
The utility model provides a following technical scheme differential probe and leading, rearmounted independent alarm circuit, include:
the differential probe is internally and transversely provided with a circuit board, one end of the circuit board is provided with a forward differential signal measuring end and a reverse differential signal measuring end, and the other end of the circuit board is provided with a power supply interface;
the circuit board is integrated with a preposed alarm circuit, and the preposed alarm circuit comprises: a forward voltage alarm circuit and a reverse voltage alarm circuit;
preferably, the forward differential signal measuring end and the reverse differential signal measuring end are respectively and electrically connected with the forward voltage alarm circuit and the reverse voltage alarm circuit through the voltage reduction circuit;
preferably, the forward voltage alarm circuit is composed of a forward amplifying circuit and a forward voltage comparing circuit, and the reverse voltage alarm circuit is composed of a reverse amplifying circuit and a reverse voltage comparing circuit;
preferably, the control end of the PWM1 of the forward amplifying circuit and the control end of the PWM2 of the reverse amplifying circuit are both electrically connected to the control pin of the single chip;
preferably, the output end of the forward amplifying circuit is respectively connected with the forward voltage comparison circuit and the reverse voltage comparison circuit in parallel, the OUT + input end of a forward pin of the forward voltage comparison circuit is electrically connected with the OUT + output pin of the Buffer, and the OUT-input end of a reverse pin of the reverse voltage comparison circuit is electrically connected with the OUT-output pin of the Buffer;
preferably, the Buffer is electrically connected with a control pin of the singlechip through a differential operational amplifier, and the control pin of the singlechip is also electrically connected with an LED and a buzzer;
preferably, the output end of the OUT + pin and the output end of the OUT-pin of the Buffer have a voltage reference point, and the single chip microcomputer judges the forward voltage or the reverse voltage of the reference point through a forward voltage comparison circuit and a reverse voltage comparison circuit to control the LED and the buzzer to alarm.
The circuit board is also integrated with a rear alarm circuit which consists of an amplifying circuit and a comparison circuit;
preferably, the amplifying circuit is provided with an operational amplifier, and the PWM3 control end of the operational amplifier is electrically connected to the control pin of the single chip;
preferably, the comparison circuit has a window comparator, and the input end of the window comparator is electrically connected with the equidirectional output end of the operational amplifier;
preferably, the positive pin OUT input end of the window comparator is electrically connected with the output end of the control conversion circuit;
the singlechip controls the operational amplifier to regulate the voltage of the input end of the window comparator through the PWM3 control pin, the allowable voltage fluctuation range of the window comparator is between +7V and-7V, when the voltage of the input end of the OUT pin exceeds +7V or-7V, the voltage of the output end of the control conversion circuit is over high, the singlechip sends a command to the LED or the buzzer, the LED lamp is turned on, and the buzzer sends OUT buzzing sound to give an alarm.
Has the advantages that:
(1) the utility model discloses a mutual independence work of postposition alarm circuit and preposition alarm circuit, preposition alarm circuit need detect forward and backward differential signal voltage respectively, postposition alarm circuit only detects to the voltage of single-ended output end;
(2) the utility model discloses a set up leading alarm circuit behind the step-down circuit, even voltage after the step-down circuit step-down is still too big, the utility model discloses a leading alarm circuit can be according to the voltage that follow-up circuit bore through forward voltage comparison circuit and reverse voltage comparison circuit after carrying out the comparison, after the voltage size is judged through the voltage reference point that the Buffer output has, the singlechip sends the order for LED or bee calling organ, the LED lamp lights and bee calling organ sends the buzzing sound of buzzing and reports to the police, avoided follow-up circuit to be burnt out by the large voltage, the effectual follow-up circuit that has protected; the utility model connects the rear alarm circuit in parallel with the output end of the control conversion circuit, and effectively measures and alarms the subsequent circuit;
(3) the utility model discloses a leading warning circuit and rearmounted warning circuit both mutually independent work, and measuring circuit is reported to the police simultaneously again, and the front end circuit and the rear end circuit for differential probe provide abundant guarantee.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a circuit diagram of a forward amplifying circuit of the pre-alarm circuit of the present invention;
FIG. 3 is a circuit diagram of a reverse amplifying circuit of the pre-alarm circuit of the present invention;
FIG. 4 is a circuit diagram of a forward voltage comparison circuit of the pre-alarm circuit of the present invention;
FIG. 5 is a circuit diagram of a reverse voltage comparison circuit of the pre-alarm circuit of the present invention;
fig. 6 is a circuit diagram of an amplifying circuit of the rear alarm circuit of the present invention;
FIG. 7 is a circuit diagram of a comparison circuit of the rear alarm circuit of the present invention;
FIG. 8 is a schematic view of the internal circuit board structure of the present invention;
FIG. 9 is a circuit diagram of the single chip microcomputer according to the present invention;
FIG. 10 is a diagram of the LED alarm circuit of the present invention;
fig. 11 is a circuit diagram of the buzzer alarm of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the utility model provides a field ordinary skilled person does not make all other embodiments that obtain under the creative work prerequisite, all belong to the utility model discloses the scope of protection.
Referring to fig. 8, the utility model provides a differential probe and front-mounted and rear-mounted independent alarm circuits according to the following technical scheme, comprising a differential probe, a circuit board 3 is transversely arranged in the differential probe, a forward differential signal measuring end 1 and a reverse differential signal measuring end 2 are arranged at one end of the circuit board 3, and a power supply interface is arranged at the other end of the circuit board 3;
the circuit board 3 integrates a front alarm circuit, and the front alarm circuit comprises: the device comprises a forward voltage alarm circuit and a reverse voltage alarm circuit, wherein the forward voltage alarm circuit detects forward voltage, the reverse voltage alarm circuit detects reverse voltage, and a forward differential signal measuring end 1 and a reverse differential signal measuring end 2 are respectively and electrically connected with the forward voltage alarm circuit and the reverse voltage alarm circuit through voltage reduction circuits; the large voltages of the forward differential signal measuring terminal 1 and the reverse differential signal measuring terminal 2 are reduced to be small and then can be compared and measured through proper voltage amplification;
the forward voltage alarm circuit consists of a forward amplifying circuit and a forward voltage comparison circuit, and the reverse voltage alarm circuit consists of a reverse amplifying circuit and a reverse voltage comparison circuit; the control end of the PWM1 of the forward amplifying circuit and the control end of the PWM2 of the reverse amplifying circuit are both electrically connected with the control pin of the singlechip; the forward amplifying circuit and the reverse amplifying circuit are controlled by the singlechip to properly amplify the voltage after voltage reduction.
The output end of the forward amplifying circuit is respectively connected with the forward voltage comparison circuit and the reverse voltage comparison circuit in parallel, the positive pin OUT + input end of the forward voltage comparison circuit is electrically connected with the OUT + output pin of the Buffer, and the reverse pin OUT-input end of the reverse voltage comparison circuit is electrically connected with the OUT-output pin of the Buffer;
referring to fig. 9, the Buffer is electrically connected to a control pin of the single chip microcomputer through a differential operational amplifier, and the control pin of the single chip microcomputer is further electrically connected to an LED and a buzzer;
referring to fig. 10 and 11, the OUT + pin output end and the OUT-pin output end of the Buffer have a voltage reference point, the single chip microcomputer determines the level of the forward voltage or the reverse voltage of the reference point through the forward voltage comparison circuit and the reverse voltage comparison circuit to control the LED and the buzzer to alarm, and when the forward voltage or the reverse voltage detected by the forward voltage comparison circuit or the reverse voltage comparison circuit in the pre-alarm circuit exceeds the rated voltage set by the single chip microcomputer, the single chip microcomputer sends a command to the LED or the buzzer, the LED lights up, and the buzzer sounds a buzzing sound to alarm;
for example, if the forward voltage of the differential signal to be measured at the forward differential signal measuring terminal 1 is 7000V, after the voltage of the large voltage is reduced by the voltage reducing circuit, the output voltage reaching the OUT output terminal of the Buffer is 3.3V, at this time, the single chip microcomputer compares the voltage with the voltage that can be borne subsequently through the forward voltage comparing circuit, and the single chip microcomputer sets a certain rated voltage according to the working voltage of the subsequent circuit of the Buffer, if the rated voltage is less than 3.3V, it indicates that the output voltage at the OUT output terminal of the Buffer is too large, and the subsequent circuit is damaged due to the too large voltage, the single chip microcomputer controls the LED and the buzzer to alarm, thereby reminding the user that the measuring voltage is too large, causing damage to the differential probe to a certain extent, and needing to select the differential probe with a proper measuring range again for use when measuring; if the rated voltage set by the single chip microcomputer according to the working voltage of the subsequent circuit of the Buffer is higher than 3.3V, the voltage of 3.3V cannot damage the subsequent circuit, and the single chip microcomputer does not send an alarm command to the LED and the buzzer any more.
The circuit board 3 is also integrated with a rear alarm circuit which consists of an amplifying circuit and a comparison circuit;
referring to fig. 6, the amplifying circuit is provided with an operational amplifier, and a PWM3 control end of the operational amplifier is electrically connected to a control pin of the single chip;
referring to fig. 7, the comparison circuit has a window comparator, the input terminal of the window comparator is electrically connected to the equidirectional output terminal of the operational amplifier; the positive pin OUT input end of the window comparator is electrically connected with the output end of the control conversion circuit;
the rear alarm circuit and the front alarm circuit work independently, the front alarm circuit needs to detect the forward and reverse differential signal voltages respectively, and the rear alarm circuit only detects the voltage of the single-ended output end;
referring to fig. 7, the single chip microcomputer controls the operational amplifier to adjust the voltage at the input end of the window comparator through the PWM3 control pin, since the allowable voltage fluctuation range of the window comparator is from +7V to-7V, when the voltage at the input end of the OUT pin exceeds +7V or-7V, it indicates that the voltage at the output end of the control conversion circuit is too high, the single chip microcomputer sends a command to the LED or the buzzer, the LED lights up, and the buzzer sounds a buzzing sound to give an alarm;
for example, if the forward voltage of the differential signal to be measured is 500V, the forward voltage is reduced by the voltage reduction circuit and the voltage of the control conversion circuit is amplified, and the output voltage of the OUT output end of the control conversion circuit obtained by the × 10 attenuation gear set by the control conversion circuit is 50V, which is far greater than 7V, the single chip microcomputer controls the LED and the buzzer to alarm; if the output voltage of the OUT output end of the control conversion circuit obtained by the attenuation gear position of multiplied by 100 set by the control conversion circuit is 5V, and the voltage is between +7V and-7V, the rear alarm circuit can not give an alarm.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A front-end and rear-end independent alarm circuit is characterized by comprising:
the pre-alarm circuit is connected in parallel with the output end of the voltage reduction circuit;
the pre-alarm circuit comprises: a forward voltage alarm circuit and a reverse voltage alarm circuit;
the forward voltage alarm circuit consists of a forward amplifying circuit and a forward voltage comparison circuit; and the number of the first and second electrodes,
the positive pin OUT + input end of the positive voltage comparison circuit is electrically connected with the OUT + output pin of the Buffer;
the reverse voltage alarm circuit consists of a reverse amplification circuit and a reverse voltage comparison circuit; and the number of the first and second electrodes,
the OUT-input end of a reverse pin of the reverse voltage comparison circuit is electrically connected with the OUT-output pin of the Buffer;
the OUT + pin output end and the OUT-pin output end of the Buffer are provided with a voltage reference point; and the number of the first and second electrodes,
the single chip microcomputer judges the forward voltage or the reverse voltage of the voltage reference point of the Buffer through a forward voltage comparison circuit and a reverse voltage comparison circuit respectively;
the rear alarm circuit is connected in parallel with the output end of the control conversion circuit;
the rear alarm circuit consists of an amplifying circuit and a comparison circuit;
the amplifying circuit is provided with an operational amplifier, and the PWM3 control end of the operational amplifier is electrically connected with the control pin of the singlechip;
the comparison circuit is provided with a window comparator, and the input end of the window comparator is electrically connected with the equidirectional output end of the operational amplifier;
the single chip microcomputer controls the voltage of the input end of the operational amplifier adjusting window comparator to fluctuate within the range from +7V to-7V through the PWM3 control pin.
2. A front and rear independent alarm circuit according to claim 1, wherein: and the PWM1 control end of the forward amplifying circuit and the PWM2 control end of the reverse amplifying circuit are both electrically connected with a control pin of the singlechip.
3. A front and rear independent alarm circuit according to claim 1, wherein: and the output end of the forward amplifying circuit is respectively connected with the forward voltage comparison circuit and the reverse voltage comparison circuit in parallel.
4. A front and rear independent alarm circuit according to claim 1, wherein: and the control pin of the singlechip is also electrically connected with an LED and a buzzer.
5. A front and rear independent alarm circuit according to claim 1, wherein: the Buffer is electrically connected with a control pin of the singlechip through a differential operational amplifier.
6. A front and rear independent alarm circuit according to claim 1, wherein: and the positive pin OUT input end of the window comparator is electrically connected with the output end of the control conversion circuit.
7. A differential probe, comprising: a forward differential signal measuring terminal (1), a reverse differential signal measuring terminal (2) and a front-end and rear-end independent alarm circuit as claimed in any one of claims 1-6; and is
The forward differential signal measuring end (1) and the reverse differential signal measuring end (2) are respectively and electrically connected with the forward voltage alarm circuit and the reverse voltage alarm circuit through the voltage reduction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020927892.0U CN212483683U (en) | 2020-05-28 | 2020-05-28 | Differential probe and front-mounted and rear-mounted independent alarm circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020927892.0U CN212483683U (en) | 2020-05-28 | 2020-05-28 | Differential probe and front-mounted and rear-mounted independent alarm circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212483683U true CN212483683U (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020927892.0U Active CN212483683U (en) | 2020-05-28 | 2020-05-28 | Differential probe and front-mounted and rear-mounted independent alarm circuits |
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| Country | Link |
|---|---|
| CN (1) | CN212483683U (en) |
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- 2020-05-28 CN CN202020927892.0U patent/CN212483683U/en active Active
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