CN111880077A - Electric element contact state detection device and working method thereof - Google Patents
Electric element contact state detection device and working method thereof Download PDFInfo
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- CN111880077A CN111880077A CN202010684353.3A CN202010684353A CN111880077A CN 111880077 A CN111880077 A CN 111880077A CN 202010684353 A CN202010684353 A CN 202010684353A CN 111880077 A CN111880077 A CN 111880077A
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 67
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- 238000011017 operating method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000003745 diagnosis Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- 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
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention provides a contact state detection device of an electric element and a working method thereof, wherein the contact state detection device of the electric element comprises an electric element contact, a capacitor and a resistor, the capacitance of the capacitor is more than or equal to 10nF, and the resistance of the resistor is more than or equal to 1k omega; one end of the electric element contact is connected with one end of the capacitor, and the other end of the capacitor is grounded; the other end of the electric element contact is grounded; the resistor is connected in series between the dc input voltage and a common junction of the electrical component contact and the capacitor. The invention can reduce the oxidation of the contact of the electric element and reduce the false detection caused by the oxidation of the contact.
Description
Technical Field
The invention relates to a contact state detection device of an electric element and an operating method thereof.
Background
In elevator systems, the state of some contacts needs to be collected, but the current flowing through the contacts is small, the common contacts are easy to oxidize, and the special contacts are used to generate higher cost. A common example is that the contact signal of an on-board relay needs to be monitored. The approach that is commonly taken is to bring another contact of the set of contacts of the on-board relay into the sense pin of the processor chip, but the current on this other contact for monitoring is generally small and easily oxidized, resulting in false alarms.
In addition, the conventional electric element contact state detection device cannot detect whether a detection pin of the chip has a fault or not, thereby causing false detection.
Disclosure of Invention
The present invention is directed to provide a contact state detection device for an electrical component and a method for operating the same, which can reduce oxidation of a contact of the electrical component and reduce erroneous detection due to the oxidation of the contact.
Another object of the present invention is to provide a device for detecting a contact state of an electrical component and a method for operating the same, which can diagnose and detect a pin fault.
The invention provides a device for detecting the contact state of an electric element, which comprises an electric element contact, a capacitor and a resistor, wherein the capacitance of the capacitor is more than or equal to 10nF, and the resistance of the resistor is more than or equal to 1k omega; one end of the electric element contact is connected with one end of the capacitor, and the other end of the capacitor is grounded; the other end of the electric element contact is grounded; the resistor is connected in series between the dc input voltage and a common junction of the electrical component contact and the capacitor.
The invention also provides an operating method of the electric element contact point state detection device, wherein the oxidation of the electric element contact point is reduced by enabling the discharge current of the capacitor to flow through the electric element contact point.
Further, the electric element contact state detection device comprises a switch element and a processor; the detection pin of the processor is connected with the common joint of the electric element contact and the capacitor; the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal; the first conduction end of the switch element is connected with the other end of the electric element contact, and the second conduction end of the switch element is grounded, or the first conduction end of the switch element is connected with the resistor, and the second conduction end of the switch element is connected with the common joint of the electric element contact and the capacitor; the working method of the electric element contact state detection device comprises the following steps: applying a control signal to a control terminal of the switching element; the processor judges whether the detection pin has a fault according to the level change state of the detection pin responding to the control signal.
The invention also provides a device for detecting the contact state of the electrical element, which comprises the electrical element contact, a capacitor and a resistor, wherein the capacitance of the capacitor is more than or equal to 10nF, and the resistance of the resistor is more than or equal to 1k omega; one end of the electric element contact is connected with one end of the capacitor, and the other end of the capacitor is grounded; the other end of the electric element contact is connected with the direct current input voltage; the resistor is connected in series between the common point of the electrical component contact and the capacitor and ground.
The invention also provides an operating method of the electric element contact point state detection device, wherein the oxidation of the electric element contact point is reduced by enabling the charging current of the capacitor to flow through the electric element contact point.
Further, the electric element contact state detection device comprises a switch element and a processor; the detection pin of the processor is connected with the common joint of the electric element contact and the capacitor; the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal; the first conduction end of the switch element is connected with the direct-current input voltage, and the second conduction end of the switch element is connected with the other end of the electric element contact, or the first conduction end of the switch element is connected with the common joint of the electric element contact and the capacitor, and the second conduction end of the switch element is connected with the resistor; the working method of the electric element contact state detection device comprises the following steps: applying a control signal to a control terminal of the switching element; the processor judges whether the detection pin has a fault according to the level change state of the detection pin responding to the control signal.
The invention has at least the following advantages:
1. according to the embodiment of the invention, the charging current or the discharging current of the capacitor passes through the electric element contact, so that a larger current can pass through the small current contact, the contact is not easy to oxidize, the service life of the contact is prolonged, and the reliability of the contact state detection result is improved;
2. according to the embodiment of the invention, the processor can judge whether the detection pin has a fault or not according to the level change state of the detection pin responding to the control signal by applying the control signal to the control end of the switch circuit.
Drawings
Fig. 1 shows a schematic circuit diagram of an electric element contact state detecting device according to a first embodiment of the present invention.
Fig. 2 shows a schematic circuit diagram of an electric element contact state detecting device according to a second embodiment of the present invention.
Fig. 3 shows a schematic circuit diagram of an electric element contact state detecting apparatus according to a third embodiment of the present invention.
Fig. 4 shows a schematic circuit diagram of an electric element contact state detecting apparatus according to a fourth embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Fig. 1 shows a schematic circuit diagram of an electric element contact state detecting device according to a first embodiment of the present invention. Referring to fig. 1, the electrical component contact state detecting apparatus according to the first embodiment of the present invention includes a resistor R, an electrical component contact K1, a capacitor C, a switching element S, and a processor 1.
In the first embodiment, one end of the electrical component contact K1 is connected to the capacitor C, and the other end of the capacitor C is grounded. The resistor R is connected in series between the dc input voltage V and the common point of the electrical component contacts and the capacitor.
The switching element S comprises a first conduction end, a second conduction end and a control end; the first conduction end of the switch element S is connected to the other end of the electrical element contact K1, the second conduction end of the switch element S is grounded, and the control end of the switch element S is used for receiving an externally input control signal.
The detection pin 11 of the processor 1 is connected to a common point P of the electrical element contact K1 and the capacitor C, and the common point P constitutes a detection point.
In this embodiment, the processor 1 is a single chip microcomputer. The electrical component contacts are relay contacts. The switching element S is an NPN triode, and a collector electrode, an emitter electrode and a base electrode of the NPN triode respectively form a first conducting end, a second conducting end and a control end of the switching element S.
The operation method of the electrical component contact state detection apparatus of the first embodiment includes: when the electrical element contact K1 is open, the dc input voltage + V charges the capacitor C through the resistor R; when the electrical element contact K1 is closed, the discharge current of the capacitor C flows through the electrical element contact K1, discharging to ground. In this manner, a large current can be generated in a short time when the electrical element contact K1 is turned on. Therefore, the oxidation of the contact K1 of the electric element is prevented, and the problem that the contact cannot be normally conducted due to the oxidation of the contact when the contact with larger rated current is used for a low-current circuit is avoided.
In the conventional electric element contact state detection device, the resistance value of the resistor R is more than or equal to 1k omega, so that the current passing through the electric element contact is V/R under the condition of no capacitor, and is not too large. In addition, although some circuits are provided with capacitors, the capacitors are used for high-frequency filtering, the capacitance of the capacitors is small, the capacitance of the capacitors in the embodiment is larger than or equal to 10nF, and no resistor exists in a discharge loop of the capacitors, so that the current flowing through the contacts of the electric elements is large, and the aim of deoxidation can be achieved.
The magnitude of the resistor R and the magnitude of the capacitance of the capacitor C are combined to take into account contact, voltage, and power consumption. In one specific embodiment, the resistor R has a value of 1k Ω and the capacitor C has a capacitance of 50 nF.
Further, the operation method of the electrical component contact state detection apparatus of the first embodiment further includes: applying a control signal to a control terminal of the switching element S; the processor 1 judges whether the detection pin 11 has a fault according to the level change state of the detection pin 11 responding to the control signal.
The electrical component contact K1 and the switching element S are in the conductive state most of the time. In a specific embodiment, a waveform signal is superimposed on the control terminal of the switching element S when the electrical element contact K1 and the switching element S are conductive; if the detection pin 11 is normal, a corresponding waveform should be obtained at the detection pin 11 (detection point) of the processor 1, and if the processor 1 detects that the waveform of the level change state signal of the detection pin is inconsistent with the waveform of the waveform signal, it determines that the detection pin 11 has a fault.
In another embodiment, the control signal applied to the switching element S is a control signal for controlling the switching of the switching element S. For example, when the switching element S is controlled to be turned off, the processor 1 should detect that the detection pin 11 is in a high state, and if it is detected that the detection pin 11 is still in a low state, it can be determined that the detection pin 11 has a fault.
If the function of detecting pin failure need only be achieved for the purpose of preventing oxidation of the electrical component contact K1, and diagnosis is not required, the switch circuit S need not be provided.
Fig. 2 shows a schematic circuit diagram of an electric element contact state detecting device according to a second embodiment of the present invention. Referring to fig. 2, the second embodiment is mainly different from the first embodiment in that the switch element S is connected in series between the resistor R and the common point P of the electrical element contact K1 and the capacitor C, i.e., the first conducting terminal of the switch element S is connected to the resistor R, and the second conducting terminal of the switch element S is connected to the common point P of the electrical element contact K1 and the capacitor C.
The operation method of the electrical component contact state detection apparatus according to the second embodiment of the present invention is similar to that of the electrical component contact state detection apparatus according to the first embodiment of the present invention, and is not described herein again.
Fig. 3 shows a schematic circuit diagram of an electric element contact state detecting apparatus according to a third embodiment of the present invention. Referring to fig. 3, in the third embodiment, one end of the electrical component contact K1 is connected to one end of the capacitor C, and the other end of the capacitor C is grounded. Resistor R is connected in series between electrical component contact K1 and the common point P of capacitor C and ground. The capacitance of the capacitor is more than or equal to 10nF, and the resistance value of the resistor is more than or equal to 1k omega.
The first conduction end of the switch element S is connected with the direct current input voltage + V, the second conduction end of the switch element S is connected with the other end of the electric element contact K1, and the control end of the switch element S is used for receiving an externally input control signal.
In the third embodiment, the processor 1 is a single chip microcomputer. The electrical component contacts are relay contacts. The switching element S is an NPN triode, and a collector electrode, an emitter electrode and a base electrode of the NPN triode respectively form a first conducting end, a second conducting end and a control end of the switching element S.
The operation method of the electric element contact state detection apparatus of the third embodiment includes: when the electrical element contact K1 is closed, the dc input voltage + V charges the capacitor C through the resistor R, and the charging current of the capacitor C flows through the electrical element contact K1, thereby reducing oxidation of the electrical element contact.
Further, the operating method of the electrical component contact point state detection apparatus of the third embodiment further includes: applying a control signal to a control terminal of the switching element S; the processor 1 judges whether the detection pin 11 has a fault according to the level change state of the detection pin 11 responding to the control signal. The control signal may be a waveform signal or a control signal that controls the on/off of the switching element S, similar to the first embodiment. If the function of detecting pin failure need only be achieved for the purpose of preventing oxidation of the electrical component contact K1, and diagnosis is not required, the switch circuit S need not be provided.
Fig. 4 shows a schematic circuit diagram of an electric element contact state detecting apparatus according to a fourth embodiment of the present invention. Referring to fig. 4, the main difference between the fourth embodiment and the third embodiment is that the switch element S is connected in series between the common node P of the electrical element contact K1 and the capacitor C and the resistor R, i.e. the first conducting terminal of the switch element S is connected to the common node P of the electrical element contact K1 and the capacitor C, and the second conducting terminal of the switch element S1 is connected to the resistor R.
The operation method of the electrical component contact state detection apparatus according to the fourth embodiment of the present invention is similar to that of the electrical component contact state detection apparatus according to the third embodiment of the present invention, and is not described again here.
Claims (12)
1. The device for detecting the contact state of the electric element is characterized by comprising an electric element contact, a capacitor and a resistor, wherein the capacitance of the capacitor is more than or equal to 10nF, and the resistance value of the resistor is more than or equal to 1k omega;
one end of the electric element contact is connected with one end of the capacitor, and the other end of the capacitor is grounded; the other end of the electric element contact is grounded; the resistor is connected in series between the dc input voltage and a common junction of the electrical component contact and the capacitor.
2. The electrical component contact state detection device of claim 1, wherein the electrical component contact state detection device comprises a switching element and a processor;
the detection pin of the processor is connected to the common joint of the electric element contact and the capacitor;
the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal;
the first conducting end of the switch element is connected with the other end of the electric element contact, and the second conducting end of the switch element is grounded, or the first conducting end of the switch element is connected with the resistor, and the second conducting end of the switch element is connected with a common joint of the electric element contact and the capacitor.
3. The apparatus for detecting a contact state of an electrical component according to claim 2, wherein the switching element is an NPN transistor, and a collector, an emitter, and a base of the NPN transistor respectively constitute the first conduction terminal, the second conduction terminal, and the control terminal of the switching element.
4. The electrical component contact state detection device of claim 1, wherein the electrical component contact is a relay contact.
5. An operating method of the electrical component contact state detecting device according to claim 1, wherein oxidation of the electrical component contact is reduced by causing a discharge current of the capacitor to flow through the electrical component contact.
6. The operating method of the electrical component contact state detecting device according to claim 5, wherein the electrical component contact state detecting device includes a switching element and a processor;
the detection pin of the processor is connected to the common joint of the electric element contact and the capacitor;
the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal;
the first conducting end of the switch element is connected with the other end of the electric element contact, and the second conducting end of the switch element is grounded, or the first conducting end of the switch element is connected with the resistor, and the second conducting end of the switch element is connected with the common joint of the electric element contact and the capacitor;
the working method of the electric element contact state detection device comprises the following steps: applying a control signal to a control terminal of the switching element; and the processor judges whether the detection pin has a fault according to the level change state of the detection pin responding to the control signal.
7. The device for detecting the contact state of the electric element is characterized by comprising an electric element contact, a capacitor and a resistor, wherein the capacitance of the capacitor is more than or equal to 10nF, and the resistance value of the resistor is more than or equal to 1k omega;
one end of the electric element contact is connected with one end of the capacitor, and the other end of the capacitor is grounded; the other end of the electric element contact is connected with a direct current input voltage; the resistor is connected in series between the common point of the electrical component contact and the capacitor and ground.
8. The electrical component contact state detection device of claim 7, wherein the electrical component contact state detection device comprises a switching element and a processor;
the detection pin of the processor is connected to the common joint of the electric element contact and the capacitor;
the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal;
the first conduction end of the switch element is connected with the direct current input voltage, and the second conduction end of the switch element is connected with the other end of the electric element contact, or the first conduction end of the switch element is connected with a common point of the electric element contact and the capacitor, and the second conduction end of the switch element is connected with the resistor.
9. The apparatus for detecting a contact state of an electrical component according to claim 8, wherein the switching element is an NPN transistor, and a collector, an emitter, and a base of the NPN transistor respectively constitute the first conduction terminal, the second conduction terminal, and the control terminal of the switching element.
10. The electrical component contact state detection device of claim 7, wherein the electrical component contact is a relay contact.
11. An operating method of the electrical component contact state detecting device according to claim 7, wherein oxidation of the electrical component contact is reduced by causing a charging current of the capacitor to flow through the electrical component contact.
12. The operating method of the electrical component contact state detecting device according to claim 11, wherein the electrical component contact state detecting device includes a switching element and a processor;
the detection pin of the processor is connected to the common joint of the electric element contact and the capacitor;
the switch element comprises a first conduction end, a second conduction end and a control end, and the control end of the switch element is used for receiving an externally input control signal;
a first conduction end of the switch element is connected with the direct-current input voltage, and a second conduction end of the switch element is connected with the other end of the electric element contact, or the first conduction end of the switch element is connected with a common point of the electric element contact and the capacitor, and the second conduction end of the switch element is connected with the resistor;
the working method of the electric element contact state detection device comprises the following steps: applying a control signal to a control terminal of the switching element; and the processor judges whether the detection pin has a fault according to the level change state of the detection pin responding to the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010684353.3A CN111880077A (en) | 2020-07-16 | 2020-07-16 | Electric element contact state detection device and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010684353.3A CN111880077A (en) | 2020-07-16 | 2020-07-16 | Electric element contact state detection device and working method thereof |
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| CN111880077A true CN111880077A (en) | 2020-11-03 |
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| CN202010684353.3A Pending CN111880077A (en) | 2020-07-16 | 2020-07-16 | Electric element contact state detection device and working method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0433220A (en) * | 1990-05-28 | 1992-02-04 | Mitsubishi Electric Corp | Input circuit for contact |
| JPH09131427A (en) * | 1995-11-08 | 1997-05-20 | Daiichi Shokai Co Ltd | Switch detection circuit for paching machine |
| JP2001126573A (en) * | 1999-10-26 | 2001-05-11 | Hitachi Ltd | Cost-cutting electric powered contact signal insurance circuit |
| JP2001216878A (en) * | 2000-02-03 | 2001-08-10 | Toyota Motor Corp | Switching condition monitoring circuit and switch |
| CN103676681A (en) * | 2012-09-17 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Single-bond switch control circuit and LED flashlight |
| CN108107357A (en) * | 2017-12-27 | 2018-06-01 | 金卡智能集团股份有限公司 | Switching signal detection circuit with self-diagnostic function |
-
2020
- 2020-07-16 CN CN202010684353.3A patent/CN111880077A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0433220A (en) * | 1990-05-28 | 1992-02-04 | Mitsubishi Electric Corp | Input circuit for contact |
| JPH09131427A (en) * | 1995-11-08 | 1997-05-20 | Daiichi Shokai Co Ltd | Switch detection circuit for paching machine |
| JP2001126573A (en) * | 1999-10-26 | 2001-05-11 | Hitachi Ltd | Cost-cutting electric powered contact signal insurance circuit |
| JP2001216878A (en) * | 2000-02-03 | 2001-08-10 | Toyota Motor Corp | Switching condition monitoring circuit and switch |
| CN103676681A (en) * | 2012-09-17 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Single-bond switch control circuit and LED flashlight |
| CN108107357A (en) * | 2017-12-27 | 2018-06-01 | 金卡智能集团股份有限公司 | Switching signal detection circuit with self-diagnostic function |
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