Open-close type direct-current micro-current sensor

Abstract

The utility model provides an open-close type direct-current micro-current sensor, and relates to the technical field of direct-current micro-current sensors. The direct-current micro-current sensor comprises a direct-current micro-current sensor body and a bottom plate, the direct-current micro-current sensor body is placed at the top end of the bottom plate, a surrounding plate is fixedly installed at the top of the bottom plate, and the direct-current micro-current sensor body is detachably connected into the surrounding plate through a connecting assembly. Therefore, the direct current micro-current sensor body can be disassembled and assembled only by plugging and unplugging the direct current micro-current sensor body. According to the application, the direct current micro-current sensor body is detachably connected in the coaming through the arrangement of the connecting assembly, so that the direct current micro-current sensor body can be disassembled and assembled only by plugging and unplugging the direct current micro-current sensor body in operations such as later maintenance, and the direct current micro-current sensor is more convenient and faster to use. And the direct current micro-current sensor body is convenient to maintain and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current micro-current sensors, in particular to an open-and-close direct current micro-current sensor. Background Art

[0002] A current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output that meets certain standards to meet the requirements of information transmission, processing, storage, display, recording and control. DC microcurrent sensor is one of them.

[0003] At present, DC microcurrent sensors are usually fixed by screws. This means that when the DC microcurrent sensor is repaired at a later stage, multiple screws need to be loosened one by one, which is time-consuming and affects the disassembly efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide an open-close type DC micro-current sensor, which can solve the above-mentioned technical problems.

[0005] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] A retractable DC microcurrent sensor comprises a DC microcurrent sensor body and a base plate, wherein the DC microcurrent sensor body is placed on the top of the base plate, and a surround is fixedly installed on the top of the base plate, and the DC microcurrent sensor body is detachably connected to the surround through a connecting component, so that the DC microcurrent sensor body can be disassembled and assembled by only plugging and unplugging the DC microcurrent sensor body.

[0007] As a preferred solution of the open-close type DC micro-current sensor described in the utility model, the connecting component includes:

[0008] A chute, the chute being provided on a side wall of the enclosure;

[0009] A positioning groove, wherein the positioning groove is provided on the bottom end of the DC micro-current sensor body, and the positioning groove and the sliding groove are aligned with each other;

[0010] A fixing plate, wherein the fixing plate is fixedly installed in the slide groove;

[0011] A sliding rod, wherein the sliding rod is slidably connected in the fixed plate;

[0012] The iron plate is fixedly mounted on one end of the slide bar, and the iron plate can be moved from the slide groove to the positioning groove.

[0013] As a preferred solution of the open-close type DC micro-current sensor described in the utility model, the connecting component further comprises:

[0014] A spring, wherein the spring is sleeved on the slide rod, and two ends of the spring are fixedly connected to the fixed plate and the iron plate respectively;

[0015] A limit plate, the limit plate is fixedly mounted on the other end of the slide bar;

[0016] The annular electromagnet is fixedly mounted on the side of the fixing plate facing the iron plate.

[0017] As a preferred solution of an open-and-closed DC microcurrent sensor described in the utility model, the DC microcurrent sensor body includes an annular iron core, a square wave excitation circuit, a shaping circuit and a square wave measurement circuit. The square wave excitation circuit generates a square wave by self-excited oscillation of an excitation coil wound on the primary side of the annular iron core. The shaping circuit is used to shape the square wave generated by the square wave excitation circuit. The square wave measurement circuit measures the period and pulse width of the shaped square wave. The PWM signal output end of the square wave measurement circuit is connected to a current compensation circuit. The compensation coil of the current compensation circuit is wound on the secondary side of the annular iron core to form a closed loop.

[0018] As a preferred solution of an open-and-closed DC micro-current sensor described in the utility model, the square wave excitation circuit includes an excitation coil, an operational amplifier U1, a resistor R1, a resistor R2, a zeroing resistor R3 and a resistor R4, one end of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R1 is grounded, one end of the resistor R2 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R2 is connected to one end of the excitation coil, one end of the zeroing resistor R3 is connected to the non-inverting input terminal of the operational amplifier U1, and the other end of the zeroing resistor R3 is grounded, the resistor R4 is connected between the non-inverting input terminal and the output terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the other end of the excitation coil and the input terminal of the shaping circuit.

[0019] As a preferred solution of an open-and-closed DC micro-current sensor described in the utility model, the shaping circuit includes a resistor R5 and a transistor Q1, one end of the resistor R5 is connected to a power supply, the other end of the resistor R5 is connected to the emitter of the transistor Q1 and the input end of the square wave measurement circuit, the base of the transistor Q1 is connected to the output end of the square wave excitation circuit, and the collector of the transistor Q1 is grounded.

[0020] As a preferred solution of an open-and-closed DC micro-current sensor described in the utility model, the current compensation circuit includes a signal amplifying circuit U2, a resistor R6 and a compensation coil, the first input end of the signal amplifying circuit U2 is connected to the PWM signal output end of the square wave measurement circuit, the second input end of the signal amplifying circuit U2 is connected to one end of the resistor R6 and one end of the compensation coil, the output end of the signal amplifying circuit U2 is connected to the other end of the compensation coil, the other end of the resistor R6 is grounded, and the compensation coil is wound on a ring-shaped iron core.

[0021] As a preferred solution of the open-and-closed DC micro-current sensor described in the utility model, the current compensation circuit includes a switching switch, and the switching switch can change the direction of the compensation current of the current compensation circuit.

[0022] As a preferred solution of an open-and-close DC micro-current sensor described in the utility model, the switching switch includes a first switching switch K1 and a second switching switch K2, the moving end of the first switching switch K1 is connected to one end of the compensation coil, the two fixed ends of the first switching switch K1 are respectively connected to the second input end and the output end of the signal amplifying circuit U2, the moving end of the second switching switch K2 is connected to the other end of the compensation coil, and the two fixed ends of the second switching switch K2 are respectively connected to the second input end and the output end of the signal amplifying circuit U2.

[0023] Compared with existing technologies:

[0024] The DC microcurrent sensor body can be detachably connected to the enclosure by setting a connecting component. During later maintenance and other operations, the DC microcurrent sensor body can be disassembled and assembled by simply plugging and unplugging the DC microcurrent sensor body, without requiring too many steps, thereby facilitating maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the front view of the structure of the utility model;

[0026] Figure 2 For this utility model Figure 1 A schematic diagram of the structure enlargement in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the DC micro-current sensor of the utility model;

[0028] Figure 4 This is a schematic diagram of the enclosure structure of the utility model;

[0029] Figure 5 This is a schematic diagram of the main flow of the DC micro-current sensor of the utility model;

[0030] Figure 6It is a schematic diagram of the open and closed states of the DC micro-current sensor body of the utility model.

[0031] In the figure: a DC micro-current sensor body 10, a bottom plate 20, a surrounding plate 21, a slide groove 31, a positioning groove 32, a fixing plate 33, a slide rod 34, an iron plate 35, a spring 36, a limit plate 37, and a ring-shaped electromagnet 38. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The utility model provides an open-close type DC micro-current sensor. Figure 1-Figure 6 , including a DC microcurrent sensor body 10 and a base plate 20, the DC microcurrent sensor body 10 is placed on the top of the base plate 20, and a surround 21 is fixedly installed on the top of the base plate 20, the DC microcurrent sensor body 10 is detachably connected to the surround 21 through a connecting component, so that the DC microcurrent sensor body 10 can be disassembled and assembled by simply plugging and unplugging the DC microcurrent sensor body 10.

[0034] During the induction monitoring process, when the current on the capacitor exceeds 10mA, a 5V voltage output can be induced, and a square wave signal is output at this time. Finally, the discharge time is calculated by counting the number of output square waves. When the discharge time drops to a certain ratio with the design time, an alarm will be given, and finally the defective resistor and capacitor components will be replaced through maintenance to prevent the occurrence of faults. In addition, the DC microcurrent sensor body 10 can measure tiny currents, and its measurement range is 50uA to 50mA. Among them, the DC microcurrent sensor body 10 adopts an open DC microcurrent sensor, so that the DC microcurrent sensor body 10 can be disassembled and assembled without destroying the original signal circuit, which is convenient for later maintenance. The opening and closing states of the DC microcurrent sensor body 10 are as shown in the figure. Figure 6 shown.

[0035] The connecting assembly includes: a slide groove 31, a positioning groove 32, a fixing plate 33, a slide rod 34, an iron plate 35, a spring 36, a limit plate 37, and a ring-shaped electromagnet 38;

[0036] The chute 31 is provided on the side wall of the enclosure 21, the positioning groove 32 is provided on the bottom end of the DC micro-current sensor body 10, and the positioning groove 32 is aligned with the chute 31, the cross-sectional shape and size of the positioning groove 32 are the same as the cross-sectional shape and size of the chute 31, the fixing plate 33 is fixedly installed in the chute 31, the slide rod 34 is slidably connected in the fixing plate 33, the iron plate 35 is fixedly installed on one end of the slide rod 34, and the iron plate 35 can be moved from the chute 31 to the positioning groove 32, and the cross-sectional shape and size of the iron plate 35 are the same as the cross-sectional shape and size of the chute 31. The shape and size of the surface are the same as the cross-sectional shape and size of the slide groove 31. The spring 36 is sleeved on the slide rod 34, and the two ends of the spring 36 are fixedly connected to the fixed plate 33 and the iron plate 35 respectively. The limit plate 37 is fixedly installed on the other end of the slide rod 34. The annular electromagnet 38 is fixedly installed on the side of the fixed plate 33 facing the iron plate 35. The suction force of the annular electromagnet 38 can be set according to needs, as long as it is ensured that when the annular electromagnet 38 is started, the iron plate 35 can be moved toward the annular electromagnet 38.

[0037] Working principle of the connecting assembly: When the DC microcurrent sensor body 10 needs to be disassembled, the annular electromagnet 38 is started to move the iron plate 35 toward the annular electromagnet 38. At this time, the spring 36 is deformed until the iron plate 35 is immersed in the slide groove 31. After that, the DC microcurrent sensor body 10 can be taken away.

[0038] The DC microcurrent sensor body 10 includes a ring-shaped iron core, a square wave excitation circuit, a shaping circuit and a square wave measurement circuit. The square wave excitation circuit generates a square wave by self-excited oscillation of an excitation coil wound around the primary side of the ring-shaped iron core. The shaping circuit is used to shape the square wave generated by the square wave excitation circuit. The square wave measurement circuit measures the period and pulse width of the shaped square wave. The PWM signal output end of the square wave measurement circuit is connected to a current compensation circuit. The compensation coil of the current compensation circuit is wound around the secondary side of the ring-shaped iron core to form a closed loop.

[0039] The square wave excitation circuit includes an excitation coil, an operational amplifier U1, a resistor R1, a resistor R2, a zeroing resistor R3 and a resistor R4. One end of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R1 is grounded. One end of the resistor R2 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R2 is connected to one end of the excitation coil. One end of the zeroing resistor R3 is connected to the non-inverting input terminal of the operational amplifier U1, and the other end of the zeroing resistor R3 is grounded. The resistor R4 is connected between the non-inverting input terminal and the output terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the other end of the excitation coil and the input terminal of the shaping circuit.

[0040] The shaping circuit includes a resistor R5 and a transistor Q1. One end of the resistor R5 is connected to a power supply, and the other end of the resistor R5 is connected to the emitter of the transistor Q1 and the input end of the square wave measurement circuit. The base of the transistor Q1 is connected to the output end of the square wave excitation circuit, and the collector of the transistor Q1 is grounded.

[0041] The current compensation circuit includes a signal amplifying circuit U2, a resistor R6 and a compensation coil. The first input end of the signal amplifying circuit U2 is connected to the PWM signal output end of the square wave measurement circuit. The second input end of the signal amplifying circuit U2 is connected to one end of the resistor R6 and one end of the compensation coil. The output end of the signal amplifying circuit U2 is connected to the other end of the compensation coil. The other end of the resistor R6 is grounded. The compensation coil is wound on a ring iron core. The signal amplifying circuit is a triode, a MOS tube or an operational amplifier.

[0042] The current compensation circuit includes a switching switch, which can change the direction of the compensation current of the current compensation circuit; the switching switch includes a first switching switch K1 and a second switching switch K2, the moving end of the first switching switch K1 is connected to one end of the compensation coil, the two fixed ends of the first switching switch K1 are respectively connected to the second input end and the output end of the signal amplifying circuit U2, the moving end of the second switching switch K2 is connected to the other end of the compensation coil, and the two fixed ends of the second switching switch K2 are respectively connected to the second input end and the output end of the signal amplifying circuit U2.

[0043] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An open-close type direct current micro-current sensor, comprising a direct current micro-current sensor body (10) and a bottom plate (20), It is characterized in that The DC micro-current sensor body (10) is placed on the top of a base plate (20), and a surrounding plate (21) is fixedly installed on the top of the base plate (20), and the DC micro-current sensor body (10) is detachably connected to the surrounding plate (21) via a connecting assembly.

2. The open-close type DC micro-current sensor according to claim 1, It is characterized in that The connection component comprises: A slide groove (31), wherein the slide groove (31) is provided on a side wall of the enclosure plate (21); A positioning groove (32), wherein the positioning groove (32) is provided on the bottom end of the DC micro-current sensor body (10), and the positioning groove (32) and the slide groove (31) are aligned with each other; A fixing plate (33), wherein the fixing plate (33) is fixedly installed in the slide groove (31); A sliding rod (34), wherein the sliding rod (34) is slidably connected in the fixing plate (33); The iron plate (35) is fixedly mounted on one end of the slide bar (34), and the iron plate (35) can be moved from the slide groove (31) to the positioning groove (32).

3. The open-close type DC micro-current sensor according to claim 2, It is characterized in that The connection component also includes: A spring (36), wherein the spring (36) is sleeved on the slide bar (34), and two ends of the spring (36) are respectively fixedly connected to the fixed plate (33) and the iron plate (35); A limit plate (37), wherein the limit plate (37) is fixedly mounted on the other end of the slide bar (34); An annular electromagnet (38) is fixedly mounted on one side of the fixing plate (33) facing the iron plate (35).

4. The open-close type DC micro-current sensor according to claim 1, It is characterized in that The DC micro-current sensor body (10) comprises an annular iron core, a square wave excitation circuit, a shaping circuit and a square wave measurement circuit. The square wave excitation circuit generates a square wave by self-excited oscillation of an excitation coil wound on the primary side of the annular iron core. The shaping circuit is used to shape the square wave generated by the square wave excitation circuit. The square wave measurement circuit measures the period and pulse width of the shaped square wave. The PWM signal output end of the square wave measurement circuit is connected to a current compensation circuit. The compensation coil of the current compensation circuit is wound on the secondary side of the annular iron core to form a closed loop.

5. The open-close type DC micro-current sensor according to claim 4, It is characterized in that The square wave excitation circuit includes an excitation coil, an operational amplifier U1, a resistor R1, a resistor R2, a zeroing resistor R3 and a resistor R4, one end of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R1 is grounded, one end of the resistor R2 is connected to the inverting input terminal of the operational amplifier U1, and the other end of the resistor R2 is connected to one end of the excitation coil, one end of the zeroing resistor R3 is connected to the non-inverting input terminal of the operational amplifier U1, and the other end of the zeroing resistor R3 is grounded, the resistor R4 is connected between the non-inverting input terminal and the output terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the other end of the excitation coil and the input terminal of the shaping circuit.

6. The open-close type DC micro-current sensor according to claim 4, It is characterized in that The shaping circuit includes a resistor R5 and a transistor Q1, one end of the resistor R5 is connected to a power supply, the other end of the resistor R5 is connected to the emitter of the transistor Q1 and the input end of the square wave measurement circuit, the base of the transistor Q1 is connected to the output end of the square wave excitation circuit, and the collector of the transistor Q1 is grounded.

7. The open-close type DC micro-current sensor according to claim 4, It is characterized in that The current compensation circuit includes a signal amplifying circuit U2, a resistor R6 and a compensation coil. The first input end of the signal amplifying circuit U2 is connected to the PWM signal output end of the square wave measurement circuit, the second input end of the signal amplifying circuit U2 is connected to one end of the resistor R6 and one end of the compensation coil, the output end of the signal amplifying circuit U2 is connected to the other end of the compensation coil, the other end of the resistor R6 is grounded, and the compensation coil is wound on a ring-shaped iron core.

8. The open-close type DC micro-current sensor according to claim 4, It is characterized in that The current compensation circuit includes a switching switch, and the switching switch can change the direction of the compensation current of the current compensation circuit.

9. The open-close type DC micro-current sensor according to claim 8, It is characterized in that The switching switch includes a first switching switch K1 and a second switching switch K2, the moving end of the first switching switch K1 is connected to one end of the compensation coil, the two fixed ends of the first switching switch K1 are respectively connected to the second input end and the output end of the signal amplifying circuit U2, the moving end of the second switching switch K2 is connected to the other end of the compensation coil, and the two fixed ends of the second switching switch K2 are respectively connected to the second input end and the output end of the signal amplifying circuit U2.

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