CN111381157A - Detection method for rapidly identifying type of low-voltage electrical appliance - Google Patents
Detection method for rapidly identifying type of low-voltage electrical appliance Download PDFInfo
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- CN111381157A CN111381157A CN202010303056.XA CN202010303056A CN111381157A CN 111381157 A CN111381157 A CN 111381157A CN 202010303056 A CN202010303056 A CN 202010303056A CN 111381157 A CN111381157 A CN 111381157A
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention belongs to the technical field of electricity, and particularly relates to a detection method for rapidly identifying the category of a low-voltage apparatus. The AC/DC detection method for the low-voltage apparatus comprises the following steps: the adjustable signal generator is adopted to actively send out a detection signal with a certain frequency, according to different responses of different types of low-voltage electrical appliances to the detection signal, the infrared heat sensor is used for collecting the response signal, the collected signal is subjected to amplification, filtering and other processing, the processed signal is introduced into the amplitude discriminator, and the discrimination of the voltage attributes of the contactor and the relay is completed through the discrimination signal output by the output end. According to the detection method for rapidly identifying the type of the low-voltage electrical appliance, through the design of the technical scheme, the adjustable signal generator is used for actively sending out signals, so that the low-voltage electrical appliance to be detected generates heat, the type of the low-voltage electrical appliance is detected through the arrangement of the infrared heat sensor and the amplitude discriminator, and the detection method has the characteristics of simplicity, convenience and rapidness.
Description
Technical Field
The invention belongs to the technical field of electricity, and particularly relates to a detection method for rapidly identifying the category of a low-voltage apparatus.
Background
The contactor and the relay are the most commonly used devices in industrial control, and the using quantity is large; the contactor and the relay are divided into a direct current type and an alternating current type, the existing detection technology is mature, and corresponding detection is mainly carried out according to the types of devices; however, in many cases, the device name plate falls off, or the name plate is blurred due to severe working environment, and the type of the contactor or the relay cannot be rapidly identified, but devices with different voltage attributes are often difficult to distinguish in appearance, and if an incorrect detection method is adopted, the device is damaged, so that the invention is necessary for rapidly identifying the type of the contactor or the relay.
Disclosure of Invention
The invention aims to provide a detection method for rapidly identifying the type of a low-voltage apparatus, which can effectively solve the technical problems that the types of devices of a contactor and a relay cannot be distinguished due to the falling off of a nameplate and the like, and the detection is difficult in the traditional method.
The invention adopts the following technical scheme for solving the technical problems:
an alternating current and direct current detection method of a low-voltage apparatus comprises the following steps: the adjustable signal generator is adopted to actively send out a detection signal with a certain frequency, according to different responses of different types of low-voltage electrical appliances to the detection signal, the infrared heat sensor collects the response signal, the collected signal is amplified, filtered and the like, the processed signal is led into the amplitude discriminator, the discrimination of the voltage attributes of the contactor and the relay is completed through the discrimination signal output by the output end, and the specific steps are as follows:
connecting the type-indistinguishable low-voltage electrical appliance to be tested in series in a circuit, namely connecting the low-voltage electrical appliance to be tested, the infrared heat sensor and the signal generator in series; the signal generator is an adjustable signal generator; the adjustable signal generator connected with the low-voltage electrical appliance to be detected sends out a detection signal with a certain frequency, the initial frequency is set to be 1-20KHz, the duration time of the signal is about 5s, the low-voltage electrical appliance to be detected generates heat after receiving the detection signal of the signal generator, the detected weak heat is converted into an electric signal by the infrared heat sensor, the collected signal is amplified by a three-stage amplifying circuit, a low-pass filter is adopted for filtering, noise is filtered, the processed signal is introduced into an amplitude discriminator, and the amplitude of a direct current or pulse signal is discriminated; if the high-level voltage is output, the attribute of the low-voltage electrical appliance to be tested is alternating current, otherwise, the attribute of the low-voltage electrical appliance to be tested is direct current.
The low-voltage electrical appliance to be tested is an alternating current contactor or a relay.
According to the detection method for rapidly identifying the type of the low-voltage electrical appliance, through the design of the technical scheme, the adjustable signal generator is used for actively sending out signals, so that the low-voltage electrical appliance to be detected generates heat, the type of the low-voltage electrical appliance is detected through the arrangement of the infrared heat sensor and the amplitude discriminator, and the detection method has the characteristics of simplicity, convenience and rapidness.
Drawings
FIG. 1 is a flow chart of an implementation of detecting contactor or relay voltage attributes.
Fig. 2 is a schematic diagram of the structure of the amplifier circuit of the present invention.
Fig. 3 is a schematic diagram of the filter circuit according to the present invention.
In the figure: 1. the device comprises a low-voltage device to be tested, 2, an infrared heat sensor, 3, a signal generator, 4, an amplifying circuit, 5, a filter circuit, 6 and an amplitude discriminator.
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.
As shown in fig. 1, in the method for detecting a low voltage apparatus of the present invention, an infrared thermal sensor is an infrared thermal sensor with a model number of scobo SM8700, a signal generator with a model number of a common source DG1022Z is selected as the signal generator, and a delazey JD36 is selected as the amplitude discriminator; the amplifying circuit is divided into three stages as shown in fig. 2, wherein the first stage adopts a common-collector amplifying circuit, the second stage adopts a common-emitter amplifying circuit, and the third stage adopts a common-collector amplifying circuit; the filter circuit adopts an RC filter circuit as shown in figure 3 to filter out interference signals.
The method specifically comprises the following steps: firstly, coils of a to-be-detected low-voltage device 1 which cannot be distinguished in type are connected in series into a circuit, a signal generator 3 is adopted to actively send out a detection signal with a certain frequency, the initial frequency is set to be 2Hz, the duration time of the signal is about 5s, according to different types of devices, the detection signal has different heat productivity, an infrared heat sensor 2 is selected to convert detected weak heat into an electric signal, a collected signal is amplified and filtered, an amplifying circuit 4 adopts a three-stage amplifying circuit, a low-pass filter is adopted by the filtering circuit 5 to filter noise, the processed signal is introduced into an amplitude discriminator, and the amplitude discriminator 6 mainly discriminates the amplitude of a direct current or pulse signal. When amplitude discrimination is performed on a direct current signal, detection processing is generally performed first, and then amplitude discrimination is performed. The amplitude discriminator consists of a voltage comparison link and a switch circuit, and the two parts are often in the same circuit; the amplitude detector provides a reference voltage which is substantially independent of fluctuations in the supply voltage or ambient temperature, whereby the reference voltage and the relevant part constitute the threshold voltage of the amplitude detector. The amplitude discriminator adopts a voltage comparator consisting of integrated operational amplifiers. The alternating current contactor or the relay electromagnetic core has eddy current, the heating value is large, the heat generation is fast, the judgment of the contactor and the relay voltage attribute is completed according to the level output by the output end, the output high level voltage attribute is alternating current, and the output low level voltage attribute is direct current.
The main difference between the ac contactor and the dc contactor is that the electromagnetic core of the ac contactor has eddy current on the iron core and the coil, so that the electromagnetic core is made into a sheet and is overlapped together. The zero-crossing moment prevents electromagnetic release, and the electromagnetic iron core is provided with a short-circuit ring, so that the number of turns of the coil is small, the current is large, and the wire diameter is thick. The electromagnetic iron core of the direct current contactor is an integral iron core, the coil is slender, and the number of turns is extremely large. If the AC contactor and the DC contactor are connected in a wrong way, the coil can be burnt due to overheating.
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. While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.
Claims (2)
1. An alternating current and direct current detection method of a low-voltage apparatus is characterized in that: the AC/DC detection method of the low-voltage apparatus comprises the following steps: the adjustable signal generator is adopted to actively send out a detection signal with a certain frequency, according to different responses of different types of low-voltage electrical appliances to the detection signal, the infrared heat sensor collects the response signal, the collected signal is amplified, filtered and the like, the processed signal is led into the amplitude discriminator, the discrimination of the voltage attributes of the contactor and the relay is completed through the discrimination signal output by the output end, and the specific steps are as follows:
connecting the type-indistinguishable low-voltage electrical appliance to be tested in series in a circuit, namely connecting one end of the low-voltage electrical appliance to be tested with the infrared heat sensor and connecting the other end of the low-voltage electrical appliance to be tested in series with the signal generator; the signal generator is an adjustable signal generator; the adjustable signal generator connected with the low-voltage electrical appliance to be detected sends out a detection signal with a certain frequency, the initial frequency is set to be 1-20KHz, the duration time of the signal is about 5s, the low-voltage electrical appliance to be detected generates heat after receiving the detection signal of the signal generator, the infrared heat sensor converts the detected weak heat into an electric signal, the collected signal is amplified by a three-stage amplifying circuit, a low-pass filter is adopted for filtering, noise is filtered, the processed signal is introduced into an amplitude discriminator, and the amplitude discriminator mainly discriminates the amplitude of a direct current or pulse signal; the attribute of the low-voltage electrical appliance to be tested which outputs the high-level voltage is alternating current, and the attribute of the low-voltage electrical appliance to be tested which outputs the low-level voltage is direct current.
2. The ac/dc detection method for the low-voltage apparatus according to claim 1, wherein: the low-voltage electrical appliance to be tested is an alternating current contactor or a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010303056.XA CN111381157B (en) | 2020-04-17 | 2020-04-17 | Detection method for rapidly identifying type of low-voltage electrical appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010303056.XA CN111381157B (en) | 2020-04-17 | 2020-04-17 | Detection method for rapidly identifying type of low-voltage electrical appliance |
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| CN111381157A true CN111381157A (en) | 2020-07-07 |
| CN111381157B CN111381157B (en) | 2022-02-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202144796U (en) * | 2011-03-20 | 2012-02-15 | 吴舒克 | Ceiling fan capable of being automatically turned off |
| US20130077349A1 (en) * | 2011-09-26 | 2013-03-28 | Lite-On Technology Corp. | Alternating current/direct current adaptor and self-adaptive voltage output method |
| CN203981571U (en) * | 2014-08-13 | 2014-12-03 | 成都君凌科创科技有限公司 | A kind of infrared gas sensor signal processing circuit |
| CN104656013A (en) * | 2013-11-21 | 2015-05-27 | 西安艾力特电子实业有限公司 | Low-voltage apparatus detector |
| CN105891635A (en) * | 2016-04-08 | 2016-08-24 | 湖南工业大学 | Digital signal processing-based electric appliance type identification device and method |
-
2020
- 2020-04-17 CN CN202010303056.XA patent/CN111381157B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202144796U (en) * | 2011-03-20 | 2012-02-15 | 吴舒克 | Ceiling fan capable of being automatically turned off |
| US20130077349A1 (en) * | 2011-09-26 | 2013-03-28 | Lite-On Technology Corp. | Alternating current/direct current adaptor and self-adaptive voltage output method |
| CN104656013A (en) * | 2013-11-21 | 2015-05-27 | 西安艾力特电子实业有限公司 | Low-voltage apparatus detector |
| CN203981571U (en) * | 2014-08-13 | 2014-12-03 | 成都君凌科创科技有限公司 | A kind of infrared gas sensor signal processing circuit |
| CN105891635A (en) * | 2016-04-08 | 2016-08-24 | 湖南工业大学 | Digital signal processing-based electric appliance type identification device and method |
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| CN111381157B (en) | 2022-02-11 |
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