CN114879086A - Disconnection detection circuit, system and method of digital quantity output circuit - Google Patents
Disconnection detection circuit, system and method of digital quantity output circuit Download PDFInfo
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- CN114879086A CN114879086A CN202210419357.8A CN202210419357A CN114879086A CN 114879086 A CN114879086 A CN 114879086A CN 202210419357 A CN202210419357 A CN 202210419357A CN 114879086 A CN114879086 A CN 114879086A
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- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 58
- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000007547 defect Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000004092 self-diagnosis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/31718—Logistic aspects, e.g. binning, selection, sorting of devices under test, tester/handler interaction networks, Test management software, e.g. software for test statistics or test evaluation, yield analysis
Abstract
The invention discloses a circuit, a system and a method for detecting the disconnection of a digital quantity output circuit, wherein the circuit comprises: the system comprises a disconnection detection module and a digital quantity output module, wherein the disconnection detection module is in circuit connection with the digital quantity output module; the disconnection detection module includes: the sampling module is arranged at a preset sampling point and used for acquiring the pressure difference between the two ends of the sampling module in a normal state and a broken line state; the amplifying module is used for amplifying the differential pressure through the differential amplifier and driving the logic level output module; the logic level output module is used for judging whether the digital quantity output circuit is in a broken line state or a normal conversion logic state; and the digital quantity output module is used for converting the digital signals output by the sampling module and the amplifying module into driving digital signals and driving the disconnection detection module to perform disconnection detection. The invention solves the defect of the existing digital quantity output circuit disconnection detection, and can support the disconnection detection of capacitive, inductive and pure-resistance controlled equipment.
Description
Technical Field
The invention relates to the technical field of industrial automation, in particular to a circuit, a system and a method for detecting disconnection of a digital quantity output circuit.
Background
With the increasing requirements on reliability and safety in the field of industrial control automation, the requirement for self diagnosis is provided for the digital output module of the automatic control, the realization of the disconnection detection of the digital output module is an important part of the self diagnosis of the digital output module, and the realization of the disconnection detection of the digital output module by adopting domestic devices is a necessary choice for domestic automatic control manufacturers under the background of domestic autonomous controllable.
The prior art has attempted to detect the disconnection of digital quantity output circuits. Patent document CN112180219A uses a sampling resistor, a diagnostic pulse, and a control load as a relay, and controls the width of the diagnostic pulse to obtain a sampling resistor voltage and perform analog-to-digital conversion on the sampling resistor voltage under the premise that a disconnection diagnostic signal is sent and the relay is not activated, and then performs voltage comparison to determine whether a disconnection has occurred. The method takes a fixed relay as a load and has the limitation of a use scene; the analog-digital conversion circuit has the characteristics of high relative load and high cost.
Aiming at a digital output circuit, foreign manufacturers release integrated circuits to support disconnection detection, and the integrated chips do not meet the requirements of automatic control and autonomous control of domestic products, namely, the requirement that a simple circuit can not identify whether a digital output module is disconnected or not.
Disclosure of Invention
The invention aims to provide a circuit, a system and a method for detecting disconnection of a digital quantity output circuit.
The invention provides a disconnection detection circuit of a digital quantity output circuit, which comprises a disconnection detection module and a digital quantity output module, wherein the disconnection detection module is in circuit connection with the digital quantity output module; the disconnection detection module includes:
the sampling module is arranged at a preset sampling point and used for acquiring the pressure difference between the two ends of the sampling module in a normal state and a broken line state;
the amplifying module is used for amplifying the differential pressure through a differential amplifier and driving a logic level output module;
the logic level output module is used for judging whether the digital quantity output circuit is in a disconnection and normal conversion logic state, and is in the disconnection state when the pressure difference is smaller than a preset threshold value and is in the normal state when the pressure difference is larger than the preset threshold value;
the digital quantity output module is used for converting the digital signals output by the sampling module and the amplifying module into driving digital signals and driving the wire breakage detection module to perform wire breakage detection;
the two sampling ends of the sampling module are respectively connected with the input end of the amplifying module, the output end of the amplifying module is connected with the logic level output module through a circuit, and the sampling module is connected with the equivalent load impedance ground.
Preferably, the sampling module adopts a diode, in the source type digital quantity output circuit, the cathode and the anode of the diode are respectively connected with the input end of the amplifying module, and the cathode of the diode is connected with the equivalent impedance and grounded.
Preferably, the sampling module adopts a diode, in the drain digital quantity output circuit, the cathode and the anode of the diode are respectively connected with the input end of the amplifying module, and the anode of the diode is connected with the equivalent impedance and connected with a power supply in parallel.
Preferably, the digital quantity output module adopts an equivalent switch, and when the equivalent switch is turned on, the disconnection state is judged.
Preferably, the digital quantity output module further adopts a MOS transistor.
Preferably, the equivalent load impedance comprises at least one of a purely resistive load, a capacitive load and an inductive load.
Preferably, the sampling comparison module is used for replacing the amplification module and the logic level output module and realizing the functions of the amplification module and the logic level output module.
The invention also provides a disconnection detection system of the digital quantity output circuit, which comprises the disconnection detection circuit of the digital quantity output circuit.
The invention also provides a disconnection detection method of the digital quantity output circuit, which is realized by adopting the disconnection detection circuit of the digital quantity output circuit, and comprises the following steps:
step S1, setting the connection state between the digital output control circuit and the controlled device or circuit as the disconnection state and the normal state respectively;
step S2, respectively acquiring the voltage difference between two ends of a diode in the sampling module in the disconnection state and the normal state;
in step S3, the disconnection state and the normal state are determined by using the difference in voltage between the currents flowing through the diodes based on the currents in the disconnection state and the normal state, and a logic level is output.
Aiming at the prior art, the invention has the following beneficial effects:
the invention provides a detection means for realizing disconnection of a connecting circuit between a digital quantity output control circuit and controlled equipment or a circuit by adopting domestic discrete components, on one hand, a circuit for simply identifying whether a digital quantity output module is disconnected or not can be constructed by using simple and few components in a direct current type output digital quantity output type circuit, and the disconnection detection of capacitive, inductive and purely resistive controlled equipment can be supported; on the other hand, the requirement of autonomous control of some domestic products in the field of automation control is also met.
Drawings
FIG. 1 is a schematic diagram of a circuit for detecting disconnection of the digital output circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a disconnection detection structure of a source digital output circuit according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a structure of a disconnection detection circuit of a drain digital quantity output circuit according to an embodiment of the present invention;
FIG. 4 is a plot of current-voltage characteristic parameters of a diode illustrating a schematic of an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a step of a disconnection detection method for the digital output circuit according to an embodiment of the present invention;
wherein the content of the first and second substances,
1-a disconnection detection module; 2-a digital quantity output module; 3-a sampling module; 4-an amplification module; and 5-a logic level output module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention provides a disconnection detection circuit of a digital quantity output circuit, which comprises a disconnection detection module 1 and a digital quantity output module 2, wherein the disconnection detection module 1 is in circuit connection with the digital quantity output module 2; the disconnection detecting module 1 includes:
the sampling module 3 is arranged at a preset sampling point and is used for acquiring the pressure difference between the two ends of the sampling module in a normal state and a disconnection state;
the amplifying module 4 is used for amplifying the differential pressure through a differential amplifier and driving a logic level output module;
the logic level output module 5 is used for judging whether the digital quantity output circuit is in a disconnection state or a normal conversion logic state, and is in a normal state when the pressure difference is smaller than a preset threshold value and is in a disconnection state when the pressure difference is larger than the preset threshold value;
the digital quantity output module 6 is used for converting the digital signals output by the sampling module 3 and the amplifying module 4 into driving digital signals and driving the wire break detection module to carry out wire break detection;
two sampling ends of the sampling module 3 are respectively connected with the input end of the amplifying module 4, the output end of the amplifying module 4 is in circuit connection with the logic level output module 5, and the sampling module 3 is in impedance grounding connection with an equivalent load.
In one embodiment, as shown in fig. 2, the sampling module 3 is a diode, and in the source type digital output circuit, a cathode and an anode of the diode are respectively connected to the input end of the amplifying module 4, and a cathode of the diode is connected to the equivalent impedance and grounded.
In an embodiment, as shown in fig. 3, the sampling module 3 is a diode, in the drain digital quantity output circuit, a cathode and an anode of the diode are respectively connected to the input end of the amplifying module 4, and an anode of the diode is connected to the equivalent impedance and connected to a power supply.
The method is based on the principle of current sampling, adopts a diode as a sampling means, utilizes the nonlinear relation between the current and the voltage of the diode II, and increases the current and increases the voltage drop of the diode exponentially when the current flowing through the diode does not reach saturation. And a differential amplifier is adopted to amplify and output the voltage difference of the acquisition diode, and the output is independent of a driving configuration power supply VDD of the digital output circuit.
In one embodiment, the digital output module 2 adopts an equivalent switch, and when the equivalent switch is used, the disconnection state is determined.
In one embodiment, the digital output module 2 further employs a MOS transistor.
The invention can satisfy the condition that the controlled equipment or circuit controlled by the digital output circuit is capacitive, inductive or purely resistive. And the current driven by the controlled device or circuit controlled by the digital output circuit can be less than 1mA, and the equivalent impedance of the controlled device or circuit controlled by the digital output circuit can be 24 kilo ohms at most by taking the digital output circuit as an example that the driving configuration power supply VDD is 24V. The equivalent load RL may be a resistor, a capacitor, an inductor, or the like, more precisely a purely resistive load, a capacitive load, or an inductive load. When the switch K1 is turned on, the current of the sampling part will be large, and the sampling voltage will be large when the resistance is used for sampling.
The sampling module 3 of the invention adopts a diode, and the voltage difference between two ends of the diode in the sampling part is marked as V1 under the condition that a connecting line between a digital quantity output control circuit and a controlled device or a circuit is broken; when a connecting line between the digital quantity output control circuit and the controlled equipment or circuit is normal, the voltage difference between two ends of a diode in the sampling part is recorded as V2; the power supply of the digital output control circuit is marked as Vdd.
The impedance of the equivalent load RL under the disconnection state of a connecting line between the digital quantity output control circuit and the controlled equipment or circuit is recorded as R1, and the impedance is megaohm; the value of the equivalent load RL in the normal state of a connecting line between the digital quantity output control circuit and the controlled equipment or circuit is recorded as R2; the equivalent load of the equipment or the circuit controlled by the digital quantity output circuit is recorded as RL; r2 ═ R1// RL, when R1> > R1, R2 ≈ RL; the current I1 flowing through the diode in the disconnection state is Vdd/R1, R1 is megaohm, I1 does not exceed microampere, the current-voltage characteristic of the diode in the figure 3 can be known to be below 0.1V, and the actual circuit measurement is 0.01-0.03V; under the normal state of wiring, I2 is Vdd/RL, the maximum equivalent load of a device or a circuit controlled by the digital output circuit is usually in kiloohm level, I2 is in milliamp level, the current-voltage characteristic of the diode in fig. 3 can be known to be above 0.1V, and the load of the actual circuit 20K is measured to be about 0.2V. There is a dozen times quantitative relationship between V1 and V2.
In this embodiment, based on fig. 1-3, K1 is equivalent to replace an output control unit of a digital output circuit, including not only a MOS transistor, but also RL is equivalent impedance of a controlled device or circuit controlled by the digital output circuit, where the impedance may be capacitive, inductive, or purely resistive. When the digital output circuit is required to output, K1 is controlled to be opened, and when the controlled equipment or the circuit controlled by the digital output circuit is connected with the digital output control circuit in a normal state, the voltage difference between two ends of the sampling diode is recorded as V2; when the controlled device or circuit controlled by the digital output circuit is connected with the digital output control circuit in a disconnection state, the voltage difference between the two ends of the sampling diode is recorded as V1. In the two states, the difference of the voltage difference between the two ends of the sampling diode is 10 times or more. The differential voltage at two ends of the sampling diode is amplified through a differential amplifier, the amplified signal is input into a logic level output circuit, and the digital output circuit is disconnected and normally switched to a logic state.
In one embodiment, the sampling comparison circuit implements the functions of the amplifying module and the logic level output module. The amplifying and logic level output part of the invention can be replaced by a comparison circuit, and the logic of disconnection or not can be output by the comparison circuit based on the sampling output.
In an embodiment, the present invention further provides a system for detecting a disconnection of a digital output circuit, which is based on the disconnection detecting circuit of the digital output circuit in the above embodiment.
As shown in fig. 5, in an embodiment, the present invention further provides a method for detecting a disconnection of a digital output circuit, which is implemented by the disconnection detecting circuit of the digital output circuit, and includes:
step S1, setting the connection state between the digital output control circuit and the controlled device or circuit as the disconnection state and the normal state respectively;
step S2, respectively obtaining the voltage difference between two ends of the diode in the sampling module in the disconnection state and the normal state, and measuring the power supply of the corresponding digital output control circuit;
in step S3, the disconnection state and the normal state are determined by using the difference in voltage between the currents flowing through the diodes based on the currents in the disconnection state and the normal state, and a logic level is output.
Those skilled in the art can understand that, by using the volt-ampere characteristics of the diode, the resistance value of the equivalent load RL in the disconnection state of the load RL is at least M ohm, the current flowing through the diode in the sampling module is at uA level, the sampling voltage record Voff in the disconnection state of the voltage at two ends of the diode is very small, as shown in fig. 3, IF is less than 0.01mA and VF is less than 0.4V at 25 ℃ at normal temperature, and after amplification, IF the voltage record is K × Voff after amplification by K times; in the normal state of the load RL, the equivalent load RL is generally several K ohms to several ohms, assuming 4K to 6 ohms, the power supply VDD of the digital output module is 24V, and the output voltage of the conventional digital output module is 24V, the current flowing through the diode is VDD/RL, and the voltage Von at both ends of the diode increases when the sampling voltage record of the normal state is Von, as shown in fig. 4, at 25 degrees celsius at normal temperature, IF is 6mA, VF is 0.72V, and the voltage record is K × Von after amplification and assuming K times of amplification. And designing a control voltage of the logic level output part, outputting logic high when the input voltage is greater than K x Voff, and outputting logic low when the input voltage is less than K x Voff. Thereby distinguishing the disconnection state from the normal state. The disconnection and the normal are distinguished by the current-voltage characteristics of the diode and by the fact that different voltages are generated by the current flowing through the diode. The difference between the diode and the resistor sampling is that the current and voltage relationship of the resistor is linear, i.e., V is IR, the current and voltage relationship of the diode is nonlinear, the current flowing through the diode increases, the voltage across the diode increases rapidly, and does not increase after reaching a certain value, e.g., TA is 25c in fig. 4.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The disconnection detection circuit of the digital quantity output circuit is characterized by comprising a disconnection detection module and a digital quantity output module, wherein the disconnection detection module is in circuit connection with the digital quantity output module; the disconnection detection module includes:
the sampling module is arranged at a preset sampling point and used for acquiring the pressure difference between the two ends of the sampling module in a normal state and a broken line state;
the amplifying module is used for amplifying the differential pressure through a differential amplifier and driving a logic level output module;
the logic level output module is used for judging whether the digital quantity output circuit is in a disconnection and normal conversion logic state, and is in the disconnection state when the pressure difference is smaller than a preset threshold value and is in the normal state when the pressure difference is larger than the preset threshold value;
the digital quantity output module is used for converting the digital signals output by the sampling module and the amplifying module into driving digital signals and driving the wire breakage detection module to perform wire breakage detection;
the two sampling ends of the sampling module are respectively connected with the input end of the amplifying module, the output end of the amplifying module is connected with the logic level output module through a circuit, and the sampling module is connected with the equivalent load impedance ground.
2. The disconnection detecting circuit of claim 1, wherein the sampling module employs a diode, and in the source-type digital quantity output circuit, a cathode and an anode of the diode are respectively connected to the input terminal of the amplifying module, and a cathode of the diode is connected to the equivalent impedance and grounded.
3. The disconnection detecting circuit of claim 1, wherein the sampling module is a diode, and in the drain-type digital quantity output circuit, the cathode and the anode of the diode are respectively connected to the input terminal of the amplifying module, and the anode of the diode is connected to the equivalent impedance and connected to a power supply.
4. The disconnection detecting circuit of claim 1, wherein said digital quantity output module employs an equivalent switch, and when said equivalent switch is turned on, the disconnection state is determined.
5. The disconnection detecting circuit of a digital quantity output circuit as claimed in claim 1, wherein said digital quantity output module further employs a MOS transistor.
6. The disconnection detection circuit of claim 1, wherein said equivalent load impedance comprises at least one of a purely resistive load, a capacitive load, and an inductive load.
7. The disconnection detecting circuit of a digital quantity output circuit according to claim 1, further comprising a sampling comparison module replacing said amplifying module and said logic level output module and realizing functions of said amplifying module and said logic level output module.
8. A disconnection detecting system of a digital quantity output circuit, comprising the disconnection detecting circuit of the digital quantity output circuit according to any one of claims 1 to 7.
9. A disconnection detecting method of a digital quantity output circuit, which is implemented by the disconnection detecting circuit of the digital quantity output circuit according to any one of claims 1 to 7, comprising the steps of:
step S1, setting the connection state between the digital output control circuit and the controlled device or circuit as the disconnection state and the normal state respectively;
step S2, respectively acquiring the voltage difference between two ends of a diode in the sampling module in the disconnection state and the normal state;
in step S3, the disconnection state and the normal state are determined by using the difference in voltage between the currents flowing through the diodes based on the currents in the disconnection state and the normal state, and a logic level is output.
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| CN202210419357.8A CN114879086A (en) | 2022-04-21 | 2022-04-21 | Disconnection detection circuit, system and method of digital quantity output circuit |
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| CN202210419357.8A CN114879086A (en) | 2022-04-21 | 2022-04-21 | Disconnection detection circuit, system and method of digital quantity output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117368798A (en) * | 2023-12-04 | 2024-01-09 | 浙江国利信安科技有限公司 | Fault detection circuit and related circuitry |
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| US3992636A (en) * | 1976-02-05 | 1976-11-16 | Allen-Bradley Company | Digital input circuit with fault detection means |
| DE19816942A1 (en) * | 1998-04-17 | 1999-12-09 | Schneider Automation Gmbh | Circuit for monitoring an electric circuit for conductor breaks particularly for input and output circuits of sensors |
| KR101629580B1 (en) * | 2014-12-15 | 2016-06-13 | 현대오트론 주식회사 | Semiconductor apparatus with open detecting function |
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