阅读说明：本技术 一种交流接触器压降测试装置 (Voltage drop testing device of alternating current contactor ) 是由 吴风波 李鹏 刘安全 罗万黔 陈斯伟 李东江 唐春花 胡朝灵 姚文国 杨英华 李 于 2020-05-18 设计创作，主要内容包括：本发明公开了一种交流接触器压降测试装置,该装置包括数据采集模块,用于在待测试交流接触器触点闭合后采集触点两端的电压值；以及数据处理模块,用于对所述数据采集模块采集到的电压值进行分析处理得到待测试交流接触器触点两端的压降值,并转换成数字并进行显示。本发明提供的压降测试装置通过数据采集模块采集触点两端的电压值并通过数据处理模块进行处理并显示,根据显示的压降数据可以得到待测试交流接触器触点的电阻大小。该装置实现了对交流接触器触点两端的电压的有效采集、处理及显示,大大地降低了交流接触器在触点压降采集过程发生安全事故的概率。(The invention discloses a voltage drop testing device of an alternating current contactor, which comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring voltage values at two ends of a contact after the contact of the alternating current contactor to be tested is closed; and the data processing module is used for analyzing and processing the voltage value acquired by the data acquisition module to obtain the voltage drop value at two ends of the contact of the alternating current contactor to be tested, converting the voltage drop value into a number and displaying the number. The voltage drop testing device provided by the invention acquires the voltage values at two ends of the contact through the data acquisition module, processes and displays the voltage values through the data processing module, and can obtain the resistance of the contact of the alternating current contactor to be tested according to the displayed voltage drop data. The device realizes effective acquisition, processing and display of the voltage at two ends of the contact of the alternating current contactor, and greatly reduces the probability of safety accidents of the alternating current contactor in the process of acquiring the contact voltage drop.)

1. The device is characterized by comprising a data acquisition module, a voltage detection module and a voltage detection module, wherein the data acquisition module is used for acquiring voltage values at two ends of a contact after the contact of the alternating current contactor to be tested is closed; and the data processing module is used for analyzing and processing the voltage value acquired by the data acquisition module to obtain the voltage drop value at two ends of the contact of the alternating current contactor to be tested, converting the voltage drop value into a number and displaying the number.

2. The ac contactor voltage drop test device according to claim 1, wherein: the data acquisition module acquires voltage values at two ends of the contact after the contact of the alternating current contactor to be tested is closed and inputs the voltage values into the overvoltage protection module, and when the voltage values at two ends of the contact of the alternating current contactor to be tested are larger than a threshold value, the overvoltage protection module cuts off a path between the data acquisition module and the data processing module.

3. The ac contactor voltage drop test device according to claim 2, wherein: the overvoltage protection module comprises an overvoltage protection chip U1 and a first relay, and voltage values acquired by the data acquisition module are respectively input into the voltage protection chip U1; one input end of the overvoltage protection chip U1, which is used for inputting the voltage value, is connected with the normally closed contact of the first relay, and the movable contact of the first relay is connected with the data processing module; when the voltage value of two ends of the contact of the alternating current contactor to be tested is larger than the threshold value, the overvoltage protection chip U1 outputs control excitation to be loaded on the coil of the first relay.

4. The ac contactor voltage drop test device according to claim 3, wherein: the overvoltage protection device further comprises a start-stop module, the start-stop module comprises a first switch S1 and a second relay, the other input end of the overvoltage protection chip U1, which is used for inputting the voltage value, is connected with a normally open contact of the second relay, a normally closed contact of the second relay is connected with a movable contact of the first relay, and a movable contact of the second relay is connected with the data processing module; the coil loaded to the second relay via the first switch S1 is energized.

5. The ac contactor voltage drop test device according to claim 1, wherein: the device also comprises a start-stop module, wherein the voltage value acquired by the data acquisition module is input into the data processing module when the start-up module is in a working state.

6. The ac contactor voltage drop test device according to claim 1, wherein: the device also comprises an adjustable voltage conversion module which is used for providing different working voltages for different alternating current contactor coils to be tested.

7. The ac contactor voltage drop test device according to claim 1, wherein: the device also comprises a data holding module which is used for holding and displaying the pressure drop value processed and obtained by the data processing module.

8. The ac contactor voltage drop test device according to claim 7, wherein: the data holding module comprises a second switch S2 and a third relay, and a dynamic contact and a normally open contact of the third relay are respectively connected with the data processing module.

9. The ac contactor voltage drop test device according to any one of claims 1 to 8, wherein: the device also comprises a power supply module, wherein the power supply module comprises a voltage conversion circuit and/or a voltage reduction circuit which converts the 220V alternating current into the direct current.

10. The ac contactor voltage drop test device according to claim 9, wherein: the power supply module also comprises an alternating current input control circuit which is used for power supply control, and when a short circuit occurs, the live wire end of the alternating current input is disconnected.

Technical Field

The invention belongs to the field of electronic appliances, and particularly relates to a voltage drop testing device of an alternating current contactor.

Background

In the manufacturing, screening and testing processes of the contactor, a contact resistance checking mode is directly adopted to characterize the resistance capability of the contact, and the mode cannot effectively reflect the real situation of the resistance of the contact, so that the contact voltage drop at two ends of the contact needs to be tested under the conditions of rated current and rated voltage to better characterize the resistance of the contact. However, at present, there is no device for directly testing two ends of a contact, and a multimeter is adopted to test data in a manner of testing voltage drops at two ends of the contact (the collected points are inconsistent each time, and the collected data are poor in consistency), but at present, the voltages of the alternating current contactor are basically 115V and 380V, the distance between product groups of multiple groups of contacts is small, and safety events are easy to occur in the testing process. Based on the above considerations, a device capable of directly testing the contact voltage drop is needed.

Disclosure of Invention

The invention aims to provide a voltage drop testing device of an alternating current contactor, which can effectively acquire, process and display voltage drop data at two ends of a contact of the alternating current contactor and greatly reduce the probability of safety accidents of the alternating current contactor in the process of acquiring the voltage drop of the contact.

In order to achieve the purpose of the invention, the voltage drop testing device of the alternating current contactor comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring voltage values at two ends of a contact after the contact of the alternating current contactor to be tested is closed; and the data processing module is used for analyzing and processing the voltage value acquired by the data acquisition module to obtain the voltage drop value at two ends of the contact of the alternating current contactor to be tested, converting the voltage drop value into a number and displaying the number.

Furthermore, the voltage drop testing device provided by the invention also comprises an overvoltage protection module, wherein the data acquisition module acquires voltage values at two ends of the contact after the contact of the alternating current contactor to be tested is closed and inputs the voltage values into the overvoltage protection module, and when the voltage values at two ends of the contact of the alternating current contactor to be tested are greater than a threshold value, the overvoltage protection module cuts off a passage between the data acquisition module and the data processing module.

In the testing process, the situation that the contact is not normally closed may occur, the actual voltage at the two ends of the contact reaches 115V, and the data acquisition module is directly burnt if the data acquisition module directly works at the moment, so that the acquisition circuit of the data acquisition module is disconnected when the two ends of the contact of the alternating current contactor to be tested are higher than the set value through the overvoltage protection module, and the data acquisition module is protected from being burnt.

Furthermore, the voltage drop test device provided by the invention further comprises a starting module, wherein the starting module comprises a first switch S1 and a second relay, the other input end of the overvoltage protection chip U1, which is used for inputting the voltage value, is connected with the normally open contact of the second relay, the normally closed contact of the second relay is connected with the movable contact of the first relay, and the movable contact of the second relay is connected with the data processing module; the coil loaded to the second relay via the first switch S1 is energized. The voltage at two ends of the contact of the alternating current contactor to be tested is acquired by one key through the starting and stopping module, and the operation is simple.

Furthermore, the voltage drop testing device provided by the invention also comprises an adjustable voltage conversion module which is used for providing different working voltages for different alternating current contactor coils to be tested.

The coil of the contactor is required to be controlled in the process of testing the contact voltage drop of the alternating current contactor, the on-off function of the contactor contact is realized, the coil voltages are different for contactors with different specifications, different working voltages are provided through the adjustable voltage conversion module, the voltage drop test of the contactors with different specifications is met, and the applicability of the voltage drop test device provided by the invention is expanded.

Furthermore, the pressure drop testing device provided by the invention also comprises a data holding module which is used for holding and displaying the pressure drop value processed by the data processing module. The data is frozen on the display screen through the data holding module, and data loss in the acquisition process is reduced.

Further, the voltage drop test device provided by the invention further comprises a power supply module, wherein the power supply module comprises a voltage conversion circuit and/or a voltage reduction circuit which converts 220V alternating current into direct current.

Furthermore, the power supply module also comprises an alternating current input control circuit which is used for power supply control, and when a short circuit occurs, the fire wire end of the alternating current input is disconnected. The short-circuit protection of the device is realized through the alternating current input control circuit.

The invention has the beneficial effects that: the voltage drop testing device provided by the invention acquires the voltage values at two ends of the contact through the data acquisition module, processes and displays the voltage values through the data processing module, and can obtain the resistance of the contact of the alternating current contactor to be tested according to the displayed voltage drop data. The device realizes effective acquisition, processing and display of the voltage at two ends of the contact of the alternating current contactor, and greatly reduces the probability of safety accidents of the alternating current contactor in the process of acquiring the contact voltage drop.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is one of the partial circuit diagrams of the ac contactor voltage drop test apparatus provided herein;

fig. 2 is a second partial circuit diagram of the ac contactor voltage drop test apparatus provided herein;

fig. 3 is a circuit schematic of an overvoltage protection module provided herein;

FIG. 4 is a circuit schematic of a start-stop module provided herein;

FIG. 5 is a circuit diagram of an overvoltage protection module and a start-stop module provided herein;

FIG. 6 is a circuit connection diagram of a data processing module and a data retention module provided herein;

FIG. 7 is a second circuit schematic of the AC input control circuit provided herein;

in the drawings: j3, J4, and J5 are denoted as first relays, J6, J7, and J8 are second relays, and J1 and J2 are third relays.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Referring to fig. 1 to 6, the ac contactor voltage drop test device provided herein includes the following functional modules:

the power supply module is used for converting alternating current into direct current and comprises an alternating current input control circuit, a voltage conversion circuit and/or a voltage reduction circuit; as shown in fig. 1, the ac input control circuit includes a fuse F1, a resistor R35, and an indicator LED1, the fuse F1 is connected in series to the live line terminal of the ac power to implement short-circuit protection of the device, the resistor R35 and the indicator LED1 are connected in series between the live line terminal and the neutral line terminal of the ac power, an indication function is implemented by the indicator LED1, and when 220V ac power is applied, the indicator LED1 is in a working state to perform power indication. As shown in fig. 1, the voltage conversion circuit is a dc switching power supply, the input end of the voltage conversion circuit is connected to the output end of the ac input control circuit, and the module rectifies and filters 220V ac power, and then can directly convert the 220V ac power into dc power to provide corresponding working voltage for internal devices; the direct current switching power supply can adopt any switching power supply with current not exceeding 12A, such as an SE-600-48 switching power supply, and outputs 48V direct current. The voltage reduction circuit adopts a high-power voltage reduction circuit and comprises a high-power direct current DC-DC voltage reduction chip and a resistor R36, and the direct current output by the voltage conversion circuit is reduced by the high-power direct current DC-DC voltage reduction chip to provide the working voltage of the related functional module; the voltage reduced by the voltage reduction circuit can be set according to the functional module, such as 12V direct current voltage.

And the adjustable direct-current voltage conversion module is used for providing different working voltages for different coils of the alternating-current contactor J9 to be tested. As shown in fig. 1, the adjustable dc voltage converting module includes a digital encoder, a potentiometer connected to the digital encoder through a switch S4, and a liquid crystal display screen communicatively connected to the digital encoder; the input voltage of the digital encoder is provided by a voltage conversion circuit, the output end of the digital encoder is used for receiving a coil of an alternating current contactor J9 to be tested, and different voltages are output according to alternating current contactors J9 to be tested with different specifications.

The on-off times of the contactor is manually controlled by controlling the on-off of the switch S4, and the potentiometer is adjusted to change the signal input into the digital encoder, so that the purpose of outputting different voltages is achieved. The liquid crystal display screen is used for displaying the output voltage of the digital encoder and intuitively knowing the output voltage of the digital encoder. The digital encoder is stored with an internal program which can be operated after being electrified, the program is operated after being electrified to realize the control of on-off times according to the on-off of the switch S5, and the digital encoder is enabled to output different values of voltage after the potentiometer is adjusted, wherein the digital encoder, the liquid crystal display screen, the potentiometer and the switch S5 are combined into a DPX6012 module.

And the data acquisition module is used for acquiring voltage values at two ends of the contact after the contact of the AC contactor J9 to be tested is closed. As shown in fig. 1, the data acquisition module used herein is a contactor acquisition terminal J1, one end of the contactor acquisition terminal J1 is used for connecting with two ends of a contact of an ac contactor J9 to be tested, and the other end is used for connecting with the data processing module; the line between the contactor acquisition terminal J1 and the data processor is an acquisition line. The number of the terminals of the contactor acquisition terminal J1 can be determined according to the number of the contacts of the AC contactor J9 to be tested, as shown in FIG. 1, the AC contactor J9 to be tested comprises three groups of contacts, the number of the terminals of the contactor acquisition terminal J1 is 6, and every two terminals are a group and are used for being connected with two ends of one contact of the AC contactor J9 to be tested.

And the starting and stopping module is used for starting and stopping the pressure drop testing device provided by the text.

And when the voltage values at the two ends of the contact of the alternating current contactor J9 to be tested are larger than a threshold value, the overvoltage protection module cuts off a passage between the data acquisition module and the data processing module.

And the data processing module is used for analyzing and processing the contact voltage acquired by the data acquisition module, converting the contact voltage into a number and displaying the number. The data processing module comprises a liquid crystal display screen DM4A-V2-R3 and is used for analyzing, processing and converting the data acquired by the data acquisition module into specific numerical values for displaying. When the test range is exceeded, the AHT letter will be displayed on the display screen. The number of the data processing modules is determined according to the number of the contacts of the alternating current contactor J9 to be tested, and as shown in fig. 2 and fig. 6, the alternating current contactor J9 to be tested comprises three groups of contacts, and the data processing modules are matched with the number of the contact groups, so that the purpose of testing one by one is realized; of course, it is also possible to use only one data processing module to implement the processing and display of multiple sets of data.

And the data holding module is used for keeping the data displayed by the data processing module unchanged.

As shown in fig. 2, 3 and 5, the overvoltage protection module herein includes an overvoltage protection chip U1 and a first relay, and the voltage values collected by the data collection module are respectively input to the voltage protection chip U1; one input end of the overvoltage protection chip U1, which is used for inputting a voltage value, is connected with the normally closed contact of the first relay, and the movable contact of the first relay is connected with the data processing module; when the voltage value of the two ends of the contact of the alternating current contactor J9 to be tested is larger than the threshold value, the overvoltage protection chip U1 outputs control excitation to be loaded on the coil of the first relay.

As shown in fig. 2, 4 and 5, the start-stop module herein includes a first switch S1 and a second relay, another input terminal of the overvoltage protection chip U1 for inputting voltage value is connected to a normally open contact of the second relay, a normally closed contact of the second relay is connected to a moving contact of the first relay, and a moving contact of the second relay is connected to the data processing module; the coil loaded to the second relay via the first switch S1 is energized.

As shown in fig. 2 and 6, the data holding module herein includes a second switch S2 and a third relay, and the moving contact and the normally open contact of the third relay are respectively connected to the data processing module. And when the second switch S2 is pressed, the third relay starts to work, the normally open contact is closed, and the data retention judgment end of the data processing module is closed, so that the data displayed by the data processing module is kept unchanged.

The voltage drop test device circuit principles provided herein are further illustrated herein by way of example with the ac contactor J9 to be tested including three sets of contacts.

The contactor acquisition terminal J1 matched with the number of contacts of the AC contactor J9 to be tested comprises six connecting ends which are respectively an acquisition point 1-an acquisition point 6, an acquisition point 1 and an acquisition point 2 form a group, an acquisition point 3 and an acquisition point 4 form a group, and an acquisition point 5 and an acquisition point 6 form a group; the number of groups of the overvoltage protection module, the data processing module, the start-stop module and the data holding module is the same as the number of contacts of the AC contactor J9 to be tested; the circuit connection relationship is shown in connection with fig. 1-6.

The test process comprises the following steps: the AC 22V is loaded, and the +12V direct current is output after the AC is input into the control circuit, the voltage conversion circuit and the voltage reduction circuit; the output of the voltage conversion circuit is connected with the adjustable voltage conversion module, and the coil of the alternating current contactor J9 to be tested is loaded and excited through the adjustable voltage conversion module, so that the contact A, the contact B and the contact C are closed. At the moment, the first switch S1 is pressed to electrify the first relay coil, the voltage of the acquisition point 1-the acquisition point 6 of the contactor acquisition terminal J1 is input into the data processing module, the data processing module analyzes and processes the input voltage signal to obtain the voltage drop value of the two ends of the contact of the alternating current contactor J9 to be tested, and the voltage drop value is converted into a number and displayed.

In the testing process, if the situation that the contact of the AC contactor J9 to be tested is not normally closed occurs, and the voltage at the two ends of the contact of the AC contactor J9 to be tested is higher than a set value, the overvoltage protection chip U1 outputs a signal to control the third relay to work, the normally closed contact is disconnected, the acquisition line is disconnected, and the data acquisition module is protected; when the voltage of the two ends of the closed contact of the AC contactor J9 to be tested is lower than a set value, the third relay is reset, the normally closed contact is closed, the acquisition circuit is communicated, and the data acquisition module works normally.

During the test, the coil of the third relay is energized by pressing the second switch S2, so that the third relay operates to input a freeze data signal to the data processing module to freeze the display data of the data processing module.

When the test is completed, the test may be stopped by the first switch S1, or the test may be stopped as needed during the test, or may be controlled by the first switch S1.

In order to realize the control of the alternating current 220V input, a third switch S3 is added in the alternating current input control circuit, and a fuse tube of the third switch S3 and a fuse tube of the F1 are connected in series at a fire wire end to realize the control of the total power supply of the device, as shown in FIG. 7.

The voltage drop testing device provided by the invention realizes the acquisition, processing and maintenance of the alternating voltage at two ends of the contact of the alternating current contactor through the mutual matching of the modules, thereby achieving the purpose of voltage drop testing.

The present disclosure has been described in terms of the above-described embodiments, which are merely exemplary of the implementations of the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the disclosure. Rather, variations and modifications are possible within the spirit and scope of the disclosure, and these are all within the scope of the disclosure.