CN111487459A - 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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- CN111487459A CN111487459A CN202010465152.4A CN202010465152A CN111487459A CN 111487459 A CN111487459 A CN 111487459A CN 202010465152 A CN202010465152 A CN 202010465152A CN 111487459 A CN111487459 A CN 111487459A
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- 239000000523 sample Substances 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a differential probe and a front-mounted and rear-mounted independent alarm circuit, wherein a circuit board is transversely arranged in the differential probe, 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 rear alarm circuit and the front alarm circuit work independently, the front alarm circuit needs to detect forward and reverse differential signal voltages respectively, and the rear alarm circuit only detects the voltage of a single-ended output end.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a differential probe and a front-mounted and rear-mounted 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, an invention patent with the application number of 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.
Disclosure of Invention
The invention aims to provide a differential probe and a front-mounted and rear-mounted independent alarm circuit, so as to solve the problems in the background technology.
The invention provides a differential probe and a preposed and postposition independent alarm circuit, which comprises the following technical proposal:
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 L ED 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 singlechip 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 L ED and a 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 single chip microcomputer controls the operational amplifier to adjust 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 fact that the voltage of the output end of the control conversion circuit is too high is indicated, the single chip microcomputer sends a command to the L ED or the buzzer, the L ED lamp is turned on, and the buzzer sends OUT buzzing sound to give an alarm.
Has the advantages that:
(1) the rear alarm circuit and the front alarm circuit work independently, the front alarm circuit needs to detect forward and reverse differential signal voltages respectively, and the rear alarm circuit only detects the voltage of a single-ended output end;
(2) the invention arranges the front alarm circuit behind the voltage-reducing circuit, even if the voltage of the voltage-reducing circuit is still overlarge, the front alarm circuit of the invention can judge the voltage size through the voltage reference point of the Buffer output end after comparing the voltage born by the subsequent circuit through the forward voltage comparison circuit and the reverse voltage comparison circuit, the singlechip sends a command to L ED or the buzzer, the L ED lamp lights and the buzzer sends out buzzing sound to alarm, thereby avoiding the subsequent circuit from being burnt by large voltage and effectively protecting the subsequent circuit;
(3) the front-end alarm circuit and the rear-end alarm circuit of the invention not only work independently, but also can simultaneously measure the circuit alarm, thereby providing sufficient guarantee for the front-end circuit and the rear-end circuit of the differential probe.
Drawings
FIG. 1 is a block diagram illustrating the structure 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 amplification 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 post alarm circuit of the present invention;
FIG. 7 is a comparison circuit diagram of the post alarm circuit of the present invention;
FIG. 8 is a schematic diagram of an internal circuit board structure according to the present invention;
FIG. 9 is a circuit diagram of a single chip microcomputer of the present invention;
FIG. 10 is a L ED alarm circuit diagram of the present invention;
FIG. 11 is a buzzer alarm circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the invention.
Referring to fig. 8, the present invention provides a differential probe and a front and rear independent alarm circuits according to the following technical solutions, including a differential probe, a circuit board 3 is transversely disposed inside the differential probe, one end of the circuit board 3 is provided with a forward differential signal measuring end 1 and a reverse differential signal measuring end 2, and the other end of the circuit board 3 is provided with a power supply interface;
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 L ED 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 judges 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 L ED and the buzzer to alarm, 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 L ED or the buzzer, the L ED lamp is turned on, 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, the output voltage reaching the OUT output terminal of the Buffer is 3.3V after the voltage of the large voltage is reduced by the voltage reducing circuit, at this time, the single chip microcomputer compares the voltage with the voltage which 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 Buffer circuit, 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 L ED and the buzzer to give an alarm, so that the user is reminded that the measured voltage is too large, the differential probe is damaged to a certain extent, and the single chip microcomputer is used when the differential probe with a proper measuring range needs to be reselected for measurement, and if the rated voltage set according to the working voltage of the subsequent Buffer circuit is higher than 3.3V, the voltage of the 3.3V cannot damage the subsequent circuit, and the single chip microcomputer does not send the alarm command to the ED electronic device L and.
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, because 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 L ED or the buzzer, the L ED lamp is turned on, and the buzzer sends OUT 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 attenuation gear of × 10 set by the control conversion circuit is 50V which is far greater than 7V, the singlechip controls L ED and the buzzer to give an alarm, and if the output voltage of the OUT output end of the control conversion circuit obtained by the attenuation gear of × 100 set by the control conversion circuit is 5V which is between +7V and-7V, the rear alarm circuit does 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 various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made 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. The front-end and rear-end independent alarm circuit as claimed in claim 1, wherein the control pin of the single chip microcomputer is electrically connected with L ED 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 |
|---|---|---|---|
| CN202010465152.4A CN111487459A (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 |
|---|---|---|---|
| CN202010465152.4A CN111487459A (en) | 2020-05-28 | 2020-05-28 | Differential probe and front-mounted and rear-mounted independent alarm circuits |
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| Publication Number | Publication Date |
|---|---|
| CN111487459A true CN111487459A (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010465152.4A Withdrawn CN111487459A (en) | 2020-05-28 | 2020-05-28 | Differential probe and front-mounted and rear-mounted independent alarm circuits |
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| CN (1) | CN111487459A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019829A (en) * | 2020-08-31 | 2020-12-01 | 常州倍速智能科技有限公司 | Small-size low-voltage high-performance output alarm device |
-
2020
- 2020-05-28 CN CN202010465152.4A patent/CN111487459A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019829A (en) * | 2020-08-31 | 2020-12-01 | 常州倍速智能科技有限公司 | Small-size low-voltage high-performance output alarm device |
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Application publication date: 20200804 |
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