CN210464528U - Sensor fault detection circuit based on protection circuit - Google Patents
Sensor fault detection circuit based on protection circuit Download PDFInfo
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- CN210464528U CN210464528U CN201920991300.9U CN201920991300U CN210464528U CN 210464528 U CN210464528 U CN 210464528U CN 201920991300 U CN201920991300 U CN 201920991300U CN 210464528 U CN210464528 U CN 210464528U
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- 238000002955 isolation Methods 0.000 claims abstract description 38
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 4
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- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 7
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
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- 230000008569 process Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
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Abstract
The utility model discloses a sensor fault detection circuit based on protection circuit, in the circuit, the fault detection signal output part of sensor connects protection circuit and isolation output circuit, fault output signal transmission that will gather through isolation output circuit monitors and analyzes to the singlechip, protection circuit gathers fault output signal and drives relay drive circuit through opto-coupler switch circuit and sampling comparison circuit and controls the break-make of this sensor detection circuit power, the realization is made the automatic protection action to fault signal, the novel sensor fault detection circuit whole circuit is simple and easy, the function is more perfect.
Description
Technical Field
The utility model relates to a detection circuitry technical field, concretely relates to sensor fault detection circuit based on protection circuit.
Background
The sensor fault detection circuit is applied to fault detection circuits in various circuit systems, and can be used for detecting circuit fault conditions such as overcurrent, overvoltage, short circuit and the like in the circuit. The sensor is used for detecting various signals in the circuit, such as pressure, current, voltage and the like, and when the value detected by the sensor exceeds or is lower than a normal value, an electric signal is output to indicate the detected circuit fault.
In the existing sensor fault detection circuit, a simple fault output signal is generally adopted and is collected and transmitted to a single chip microcomputer for monitoring and analyzing, so that only a fault electric signal is monitored, and automatic protection action is not performed on the fault signal. Thus, although it is convenient to monitor the fault signal, there is still a need to manually operate the shutdown fault circuit, which still has the problem of incomplete function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the sensor fault detection circuit solves the problems that the existing sensor fault detection circuit is only a simple circuit for collecting fault output signals and transmitting the fault output signals to a single chip microcomputer for monitoring and analyzing, automatic protection actions are not carried out on fault signals, the fault circuit still needs to be manually operated and closed, and the function is incomplete, and provides the sensor fault detection circuit based on the protection circuit.
The utility model adopts the technical scheme as follows:
a sensor fault detection circuit based on a protection circuit comprises a protection circuit and an isolation output circuit, wherein the protection circuit and the isolation output circuit are connected with a fault detection signal output end of a sensor;
the isolation output circuit comprises a signal isolation circuit connected with the fault detection signal output end of the sensor and an overvoltage reverse protection circuit connected with the output end of the isolation circuit, and the output end of the overvoltage reverse protection circuit is used as the output end of the isolation output circuit and is connected with the single chip microcomputer;
the protection circuit includes opto-coupler switch circuit and sampling comparison circuit, the fault detection signal output part of sensor is connected to opto-coupler switch circuit transmitting terminal, and sampling comparison circuit is connected to opto-coupler switch circuit's receiving terminal, and the output outputs high level signal when sampling comparison circuit switches on at opto-coupler switch circuit's receiving terminal, and relay drive circuit is connected to sampling comparison circuit's output, and the actuation switch of relay controls the break-make of this sensor detection circuitry power.
Further, the sampling comparison circuit adopts the 555 chip to constitute, alarm circuit is connected to the output of 555 chip, the end connection power that resets of 555 chip, ground capacitor is connected to the control end of 555 chip, the threshold value end and the trigger end of 555 chip connect opto-coupler switch circuit's receiving terminal, the threshold value end of 555 chip still is connected with the one end of a resistance and the positive pole of a electric capacity, the other end connection power of resistance, the negative pole ground connection of electric capacity, relay drive circuit is connected to the discharge end of 555 chip, the break-make of the actuation on-off control detection circuit power of relay.
Further, the optical coupling switch circuit of the protection circuit is: the fault detection signal output end of the sensor is connected with the anode of the optical coupler transmitting end and one end of a resistor, the other end of the resistor and the cathode of the optical coupler transmitting end are connected with a current signal flowing out of the sensor fault, the c pole of the optical coupler receiving end is connected with the threshold end and the trigger end of the 555 chip, and the e pole of the optical coupler receiving end is grounded.
Further, the relay drive circuit is: the discharge end of 555 chips connects the one end of first resistance and second resistance, and the power is connected to the other end of first resistance, and the base of first triode is connected to the other end of second resistance, the projecting pole ground connection of first triode, the one end of diode and the positive pole of relay are connected to the collecting electrode of first triode, and the negative pole of relay is connected to the other end of diode, and the on-off of the actuation switch control detection circuit power of relay.
Furthermore, the signal isolation circuit is formed by an isolation conditioner connected with a fault detection signal output end of the sensor.
Further, the overvoltage reverse protection circuit is: the output end of the signal isolation circuit is sequentially connected with the sliding rheostat, the thirteenth resistor and the sixth diode in parallel, the cathode of the sixth diode is connected with one end of the fifth diode and one end of the fifteenth resistor, the other end of the fifth diode is connected with the power supply voltage, the other end of the fifteenth resistor is connected with one end of the sixteenth capacitor, the other end of the sixteenth capacitor is grounded, and the common end of the fifteenth resistor and the sixteenth capacitor is used as the output end of the isolation output circuit to be connected with the single chip microcomputer.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses in, the fault detection signal output part of sensor connects protection circuit and isolation output circuit, and the fault output signal transmission who will gather through isolation output circuit monitors and analyzes to the singlechip, and protection circuit gathers fault output signal and drives relay drive circuit and controls the break-make of this sensor detection circuit power through opto-coupler switch circuit and sampling comparison circuit, realizes making the automatic protection action to fault signal, and this novel sensor fault detection circuit whole circuit is simple and easy, and the function is more perfect.
2. The utility model discloses in, the fault detection signal output that protection circuit passes through opto-coupler switch circuit detection sensor, when the fault detection signal output of sensor, the triode of opto-coupler switch switches on, just can let the sampling comparison circuit output high level that the 555 chip constitutes, trigger alarm circuit reports to the police and makes the switch actuation disconnection of relay detect the power of circuit, accomplish the circuit protection, resistance and electric capacity that the threshold value end of 555 chip is connected constitute self-checking circuit and recovery circuit, can carry out whether the self-checking breaks down when the power of 555 chip is opened, and behind the switch actuation of relay, the power charges electric capacity again, protection circuit can self-resuming is for not triggering the state.
3. The utility model discloses in, protection circuit adopts the audible-visual annunciator circuit, can carry out audible-visual annunciator simultaneously when having the fault detection signal output of sensor, and is more practical.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is a schematic diagram of the protection circuit of the present invention;
fig. 3 is a schematic diagram of the overall circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are merely some, but not all, embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example one
A sensor fault detection circuit based on a protection circuit comprises a protection circuit and an isolation output circuit, wherein the protection circuit and the isolation output circuit are connected with a fault detection signal output end of a sensor;
the protection circuit includes opto-coupler switch circuit and sampling comparison circuit, as shown in fig. 2, the fault detection signal output part of sensor is connected to opto-coupler switch circuit transmitting terminal, and sampling comparison circuit is connected to opto-coupler switch circuit's receiving terminal, and the output outputs high level signal when sampling comparison circuit switches on at opto-coupler switch circuit's receiving terminal, and relay drive circuit is connected to sampling comparison circuit's output, and the actuation switch of relay controls the break-make of this sensor detection circuitry power.
The isolation output circuit comprises a signal isolation circuit connected with the fault detection signal output end of the sensor and an overvoltage reverse protection circuit connected with the output end of the isolation circuit, and the output end of the overvoltage reverse protection circuit is connected with the single chip microcomputer as the output end of the isolation output circuit.
As shown in fig. 3, the isolation output circuit is used for transmitting a signal output by the fault detection signal output end of the sensor to the single chip microcomputer through a signal isolation circuit such as an isolation conditioner ISO4-20MA and an overvoltage reverse protection circuit connected to the output end of the signal isolation circuit, so that the single chip microcomputer can monitor whether the isolation output circuit is normal during self-detection, and monitor and analyze the fault detection signal of the sensor during normal operation of the circuit to obtain the circuit condition. The reverse overvoltage protection circuit is as follows: the output end of the isolation conditioner ISO4-20MA is connected with a slide rheostat PR1, a resistor R13 and a diode D6 in parallel in sequence, the cathode of the diode D6 is connected with one end of a diode D5 and one end of a resistor R15, the other end of the diode D5 is connected with power supply voltage, the other end of the resistor R15 is connected with one end of a capacitor C16, the other end of the capacitor C16 is grounded, and the common end of the resistor R15 and the capacitor C16 serves as the output end of an isolation output circuit and is connected with a single chip microcomputer.
Further, the sampling comparison circuit adopts the 555 chip to constitute, 555 timing chip's output Q connects alarm circuit, 555 chip's the end R that resets connects the power, 555 chip's control end CVolt connects grounded capacitance C15, 555 timing chip's threshold end THR and trigger end TRIG connect optical coupling switch circuit's receiving terminal, 555 chip's threshold end THR still with resistance R9's one end and electric capacity C14's anodal connection, resistance R9's the other end connecting power, electric capacity C14's negative pole ground connection, 555 chip's discharge end DIS connects relay drive circuit, the on-off of the actuation on-off control detection circuitry power of relay. The power supply of the 555 chip is a +12V power supply.
The alarm circuit can be an LED alarm circuit or a buzzer alarm circuit or a combination of two alarm circuits.
Further, the optical coupling switch circuit of the protection circuit is: the positive pole of opto-coupler U6A transmitting terminal and the one end of a resistance R10 are connected to the fault detection signal output part of sensor, and the other end of resistance and the negative pole of opto-coupler U6A transmitting terminal are connected and are supplied sensor fault current signal to flow out, and the threshold value end and the trigger end of 555 chips are connected to the c utmost point of opto-coupler U6A receiving terminal, and the e utmost point of opto-coupler U6A receiving terminal is earthed.
Further, the relay drive circuit is: the discharge end of 555 chips connects the one end of resistance R1 and resistance R2, the other end of resistance R1 connects the +12V power, the base of tripolar Q1 is connected to resistance R2's the other end, triode Q1's emitter ground, diode D4's one end and the positive pole of relay are connected to triode Q1's collecting electrode, the negative pole of relay is connected to diode D4's the other end, the pick-up switch K1 control of relay detects the break-make of circuit power.
When the fault detection signal output end of the sensor does not output an electric signal, the capacitor C14 is gradually filled with electricity, THR is high level, the DIS interface and the Q interface are low level, the alarm in the alarm circuit does not work, and the switch K1 is in a release state.
When the fault detection signal output end of the sensor outputs an electric signal, a light emitting diode at the transmitting end of the optocoupler U6A is conducted and emits light, a phototriode at the receiving end of the optocoupler U6A is conducted, at the moment, a voltage signal of the capacitor C14 flows out through a loop conducted by the triode, THR is set to be low level, a DIS end and a Q end are high level, an alarm in an alarm circuit works, and a relay attracts a switch K1 to disconnect the power supply of the circuit which generates overcurrent. After the relay is attracted to K1, the transmitting end of the optocoupler U6A returns to the off state of no electric signal, the phototriode at the receiving end of the optocoupler U6A is turned off, the +12V power supply charges the capacitor C14 again, and the protection circuit can be automatically restored to the non-trigger state to continue protection. When the fault detection signal output end of the sensor outputs an electric signal, the signal is transmitted to the single chip microcomputer through the isolation output circuit to monitor and analyze the circuit condition.
The protection circuit can also perform self-detection on whether the sampling comparison circuit and the alarm circuit are normal or not. The +12V power supply is in a closed state firstly, and the relay and the alarm circuit do not work. At the moment of turning on the 12V power supply, the 555 chip is powered on, because the charging of the capacitor C14 needs time, the electric quantity is not stored in the capacitor C14, the THR end of the 555 chip is at a low level, the DIS end and the Q end are at high levels, an alarm in the alarm circuit works, and the relay attracts a switch K1. With normal time, the capacitor C14 is gradually filled with electricity, THR is set to be high level, the DIS interface and the Q interface are set to be low level, the alarm in the alarm circuit does not work, and the switch K1 is released. Therefore, if the audible and visual alarm works at the moment of turning on the power supply, the relay attracts the switch K1, and after a period of time, the audible and visual alarm does not work, and the switch K1 is released, the sampling comparison circuit and the alarm circuit are proved to have no fault.
Example 2
The utility model discloses preferred embodiment is on embodiment one's basis, alarm circuit is: the output end of the 555 chip is connected with one end of a resistor R3 and one end of a resistor R4, the other end of the resistor R3 is connected with one end of a light-emitting diode LED1, the other end of the light-emitting diode LED1 is grounded, the other end of the resistor R4 is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with one end of a buzzer LS1, the other end of the buzzer is connected with one end of a resistor R5, and the other end of the fifth resistor R5 is connected with a +12V power supply. When the fault detection signal output end of the sensor outputs an electric signal, the sound and light alarm can be simultaneously carried out, and the sensor is more practical.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A protection circuit based sensor fault detection circuit, characterized by: the circuit comprises a protection circuit and an isolation output circuit which are connected with the fault detection signal output end of the sensor, and the output end of the isolation output circuit is connected with the signal input end of the single chip microcomputer;
the isolation output circuit comprises a signal isolation circuit connected with the fault detection signal output end of the sensor and an overvoltage reverse protection circuit connected with the output end of the isolation circuit, and the output end of the overvoltage reverse protection circuit is used as the output end of the isolation output circuit and is connected with the single chip microcomputer;
the protection circuit includes opto-coupler switch circuit and sampling comparison circuit, the fault detection signal output part of sensor is connected to opto-coupler switch circuit transmitting terminal, and sampling comparison circuit is connected to opto-coupler switch circuit's receiving terminal, and the output outputs high level signal when sampling comparison circuit switches on at opto-coupler switch circuit's receiving terminal, and relay drive circuit is connected to sampling comparison circuit's output, and the actuation switch of relay controls the break-make of this sensor detection circuitry power.
2. The protection circuit based sensor fault detection circuit of claim 1, wherein: sampling comparison circuit adopts the 555 chip to constitute, alarm circuit is connected to the output of 555 chip, the end connection power that resets of 555 chip, grounded capacitor is connected to the control end of 555 chip, the threshold value end and the trigger end of 555 chip connect opto-coupler switch circuit's receiving terminal, the threshold value end of 555 chip still is connected with the one end of a resistance and the positive pole of a electric capacity, the other end connection power of resistance, the negative pole ground connection of electric capacity, relay drive circuit is connected to the discharge end of 555 chip, the break-make of the actuation on-off control detection circuit power of relay.
3. The protection circuit based sensor fault detection circuit of claim 1, wherein: the optical coupling switch circuit of the protection circuit is as follows: the fault detection signal output end of the sensor is connected with the anode of the optical coupler transmitting end and one end of a resistor, the other end of the resistor and the cathode of the optical coupler transmitting end are connected with a current signal flowing out of the sensor fault, the c pole of the optical coupler receiving end is connected with the threshold end and the trigger end of the 555 chip, and the e pole of the optical coupler receiving end is grounded.
4. The protection circuit based sensor fault detection circuit of claim 1, wherein: the relay drive circuit is as follows: the discharge end of 555 chips connects the one end of first resistance and second resistance, and the power is connected to the other end of first resistance, and the base of first triode is connected to the other end of second resistance, the projecting pole ground connection of first triode, the one end of diode and the positive pole of relay are connected to the collecting electrode of first triode, and the negative pole of relay is connected to the other end of diode, and the on-off of the actuation switch control detection circuit power of relay.
5. The protection circuit based sensor fault detection circuit of claim 1, wherein: the signal isolation circuit is formed by an isolation conditioner connected with the fault detection signal output end of the sensor.
6. The protection circuit based sensor fault detection circuit of claim 1, wherein: the overvoltage reverse protection circuit is as follows: the output end of the signal isolation circuit is sequentially connected with the sliding rheostat, the thirteenth resistor and the sixth diode in parallel, the cathode of the sixth diode is connected with one end of the fifth diode and one end of the fifteenth resistor, the other end of the fifth diode is connected with the power supply voltage, the other end of the fifteenth resistor is connected with one end of the sixteenth capacitor, the other end of the sixteenth capacitor is grounded, and the common end of the fifteenth resistor and the sixteenth capacitor is used as the output end of the isolation output circuit to be connected with the single chip microcomputer.
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| CN201920991300.9U CN210464528U (en) | 2019-06-27 | 2019-06-27 | Sensor fault detection circuit based on protection circuit |
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| CN201920991300.9U CN210464528U (en) | 2019-06-27 | 2019-06-27 | Sensor fault detection circuit based on protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579631A (en) * | 2020-06-11 | 2020-08-25 | 中国地质大学（武汉） | Interface conversion circuit of plasma mass spectrometer driven by laser ablation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579631A (en) * | 2020-06-11 | 2020-08-25 | 中国地质大学（武汉） | Interface conversion circuit of plasma mass spectrometer driven by laser ablation system |
| CN111579631B (en) * | 2020-06-11 | 2021-04-27 | 中国地质大学（武汉） | Interface conversion circuit of plasma mass spectrometer driven by laser ablation system |
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Effective date of registration: 20240722 Address after: Room 103, Building 5, No. 44 Shikefa Road, Weiyang District, Yangzhou City, Jiangsu Province, China 225000 Patentee after: Zhu Jiankang Country or region after: China Address before: 610000 No. 14, Zizhu middle street, high tech Zone, Chengdu, Sichuan Patentee before: Chengdu hongsida Technology Co.,Ltd. Country or region before: China |
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