Transmitter and power supply switching method thereof

Abstract

The invention provides a transmitter and a power supply switching method thereof, and belongs to the technical field of industrial signal detection, and the transmitter comprises a sensor transmitting unit, a power supply switching module, an expansion unit and a standby battery. The third end and the fifth end of the power supply switching module are electrically connected to the first common end and the second common end of the sensor transmitting unit in a one-to-one correspondence manner; the communication end of the expansion unit is electrically connected to the communication end of the sensor transmitting unit, and the first input end and the second input end of the expansion unit are electrically connected to the first end and the second end of the power supply switching module in a one-to-one correspondence mode. Through the power supply switching module and the standby battery, selective power supply can be achieved, and it is guaranteed that the sensor transmitting unit can normally obtain measurement data; and through the expansion unit, the sensor transmitting unit sends the measurement data to the expansion unit for storage during power failure, so that the sensor transmitting unit can normally acquire the measurement data, and the measurement data can be ensured not to be lost.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial signal detection, and in particular relates to a transmitter and a power switching method thereof. Background Art

[0002] Transmitters are developed from sensors. Any sensor that can output standard signals is called a transmitter. Standard signals refer to signals whose form and quantity range of physical quantities meet international standards. Since DC signals are not affected by the inductance, capacitance and load properties of the line and do not have phase shift problems, current signals of 4mA~20mA (DC) and voltage signals of 1V~5V (DC) are determined as unified standards for analog signals in process control systems.

[0003] See also Figure 1 As shown, at present, the sensor transmission unit of the transmitter includes a measuring sensor 1, an analog-to-digital converter 2, a communication module 3, a power management module 4 and a receiver 5, etc. The power management module, the signal isolation conditioner and the external power supply form a power supply circuit. After the measuring sensor obtains the measurement data, it sends it to the analog-to-digital converter for analog-to-digital conversion, and then the analog-to-digital converter sends the measurement data to the receiver via the power management module, and then the receiver sends it to the PLC controller.

[0004] However, since the sensor transmission unit of the transmitter is powered by an external power supply, when the external power is cut off, the sensor transmission unit of the transmitter will not be able to continue the collection work, and the measurement data will also be lost. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a transmitter and a power switching method thereof, aiming to solve the problem that the sensor transmission unit of the existing transmitter adopts an external power supply method and is prone to losing measurement data when the external power is cut off.

[0006] The present invention is specifically achieved in that:

[0007] In a first aspect, a transmitter comprises:

[0008] A sensor transmitter unit, used for connecting to a receiver and external power supply, wherein the sensor transmitter unit is configured to output measurement data;

[0009] A power switching module, wherein the third terminal and the fifth terminal of the power switching module are electrically connected to the first output terminal and the second output terminal of the sensor transmitter unit in a one-to-one correspondence;

[0010] An extension unit, wherein a communication end of the extension unit is electrically connected to a communication end of the sensor transmitter unit, a first input end and a second input end of the extension unit are electrically connected to a first end and a second end of the power switching module in a one-to-one correspondence, a first output end and a second control end of the extension unit are both electrically connected between a first common end of the sensor transmitter unit and a third end of the power switching module, a second output end of the extension unit is electrically connected between a second common end of the sensor transmitter unit and a fifth end of the power switching module, a first control end of the extension unit is electrically connected to a controlled end of the power switching module, and the extension unit is configured to store the measurement data and output a switching signal when the external power supply is powered off;

[0011] A backup battery, wherein the first end and the second end of the backup battery are electrically connected to the fourth terminal and the sixth terminal of the power switching module in a one-to-one correspondence, and the backup battery is used to provide a backup power supply voltage;

[0012] The power switching module is used to select and conduct the backup battery and the expansion unit according to the switching signal.

[0013] Further, the extension unit includes a control module, a first end of the control module serves as a first control end of the extension unit, a second end of the control module serves as a second control end of the extension unit, and a third end of the control module is electrically connected to a fifth end of the second power management module.

[0014] Further, the extension unit includes a second power management module and a control module, the first end of the second power management module serves as the first input end of the extension unit, the second end of the second power management module serves as the second input end of the extension unit, the third end of the second power management module serves as the first output end of the extension unit, the fourth end of the second power management module serves as the second output end of the extension unit, and the fifth end of the second power management module is electrically connected to the third end of the control module.

[0015] Further, the extension unit includes a second communication module and a memory, the first end of the second communication module serves as the communication end of the extension unit, the first end of the memory is electrically connected to the second end of the second communication module, and the third end of the second communication module and the second end of the memory are electrically connected to the fifth end of the second power management module.

[0016] Furthermore, a third terminal of the memory is electrically connected to a fourth terminal of the control module.

[0017] Furthermore, the extension unit includes a display, and an input terminal of the display is electrically connected to the fourth terminal of the memory.

[0018] Furthermore, the extension unit includes a capacitor, and the capacitor is connected in parallel between the first end and the second end of the second power management module.

[0019] In a second aspect, a power switching method for a transmitter is provided. The power switching method is applicable to the transmitter according to the first aspect, comprising:

[0020] When the external power supply is normally powered, the power switching module selects the extension unit to be connected with the sensor transmitter unit, so that the external power supply sequentially provides the sensor transmitter unit and the extension unit with an external power supply voltage, and then the sensor transmitter unit sends the measurement data to the extension unit for storage;

[0021] When the external power supply is normally cut off, the extension unit sends the switching signal to the power switching module, and the power switching module selects to turn on the backup battery and the extension unit according to the switching signal, so that the backup battery provides the backup power supply voltage to the extension unit and the sensor transmitter unit in turn, and then the sensor transmitter unit sends the measurement data to the extension unit for storage.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention can realize selective power supply through the power switching module and the backup battery, thereby ensuring that the sensor transmitter unit can normally obtain measurement data; and through the expansion unit, when the power is off, the sensor transmitter unit sends the measurement data to the expansion unit for storage, thereby enabling the sensor transmitter unit to normally obtain measurement data and ensuring that the measurement data is not lost.

[0024] (2) The present invention can supply short-term power to the power switching module through the charge stored in the capacitor, thereby ensuring the successful switching of the power switching module, thereby maintaining the stability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a transmitter in the prior art;

[0027] Figure 2 is a schematic structural diagram of a transmitter provided in an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the circuit flow of a transmitter provided by an embodiment of the present invention when the external power supply is in a power-off state.

[0029] Description of reference numerals:

[0030] 10. sensor transmitter unit; 11. measuring sensor; 12. analog-to-digital converter; 13. first communication module; 14. first power management module; 15. signal isolation conditioner;

[0031] 20. Power switching module;

[0032] 30. Extension unit; 31. Control module; 32. Second power management module; 33. Second communication module; 34. Memory; 35. Display; 36. Capacitor;

[0033] 40. Spare batteries. DETAILED DESCRIPTION

[0034] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] See also Figures 2-3 As shown, the present invention provides a technical solution: a transmitter, including a sensor transmitter unit 10, a power switching module 20, an extension unit 30 and a backup battery 40, the sensor transmitter unit 10 is used to access a receiver and an external power supply, and the sensor transmitter unit 10 is configured to output measurement data; the third end and the fifth end of the power switching module 20 are electrically connected to the first output end and the second output end of the sensor transmitter unit 10 in a one-to-one correspondence; the communication end of the extension unit 30 is electrically connected to the communication end of the sensor transmitter unit 10, the first input end and the second input end of the extension unit 30 are electrically connected to the first wiring end and the second wiring end of the power switching module 20 in a one-to-one correspondence, and the first output end and the second control end of the extension unit 30 are electrically connected to the first wiring end and the second wiring end of the power switching module 20 in a one-to-one correspondence. Both are electrically connected between the first common terminal of the sensor transmitter unit 10 and the third terminal of the power switching module 20, the second output terminal of the extension unit 30 is electrically connected between the second common terminal of the sensor transmitter unit 10 and the fifth terminal of the power switching module 20, the first control terminal of the extension unit 30 is electrically connected to the controlled terminal of the power switching module 20, and the extension unit 30 is configured to store measurement data and output a switching signal when the external power supply is cut off; the first terminal and the second terminal of the backup battery 40 are electrically connected to the fourth terminal and the sixth terminal of the power switching module 20 one by one, and the backup battery 40 is used to provide a backup power supply voltage; the power switching module 20 is used to select the conduction between the backup battery 40 and the extension unit 30 according to the switching signal.

[0040] For example, the receiver may be a 4-20 mA receiver. The power switching module 20 may be a multi-control switch, a switching switch or a relay, etc. The model of the power switching module 20 may be CH213DS, etc.

[0041] In practical applications, on the one hand, selective power supply can be achieved through the power switching module and the backup battery 40; that is, when the power is normally supplied, the external power supply provides the external power supply voltage for the sensor transmitter unit 10 and the extension unit 30; when the power is off, the power switching module 20 selects to conduct the backup battery 40 and the extension unit 30 according to the switching signal sent by the extension unit 30, so that the backup battery 40 provides the backup power supply voltage for the extension unit 30 and the sensor transmitter unit 10 in turn, ensuring that the sensor transmitter unit 10 can normally obtain the measurement data. On the other hand, through the extension unit 30, dual storage of measurement data can be achieved; that is, when the power is normally supplied, the sensor transmitter unit 10 not only sends the measurement data to the host computer, but also sends the measurement data to the extension unit 30 for storage; when the power is off, the sensor transmitter unit 10 sends the measurement data to the extension unit 30 for storage, which can not only enable the sensor transmitter unit 10 to normally obtain the measurement data, but also ensure that the measurement data is not lost.

[0042] See also Figures 2-3 As shown, in a possible embodiment, the extension unit 30 includes a control module 31, the first end of the control module 31 serves as the first control end of the extension unit 30, the second end of the control module 31 serves as the second control end of the extension unit 30, and the third end of the control module 31 is electrically connected to the fifth end of the second power management module 32.

[0043] For example, the control module 31 may be a single-chip microcomputer or a dual-band multi-protocol module, etc. The model of the single-chip microcomputer may be STM32F103C8T6, etc. The model of the dual-band multi-protocol module may be CC1352P, etc.

[0044] In practical applications, the above-mentioned selective power supply and data measurement can be realized through the communication, storage and control functions of the control module 31.

[0045] See also Figures 2-3 As shown, in a possible embodiment, the extension unit 30 includes a second power management module 32, the first end of the second power management module 32 serves as the first input end of the extension unit 30, the second end of the second power management module 32 serves as the second input end of the extension unit 30, the third end of the second power management module 32 serves as the first output end of the extension unit 30, the fourth end of the second power management module 32 serves as the second output end of the extension unit 30, and the fifth end of the second power management module 32 is electrically connected to the third end of the control module 31.

[0046] For example, the model of the second power management module 32 may be BQ25798, etc. The sensor transmitter unit 10 may include a measuring sensor 11, an analog-to-digital converter 12, a first communication module 13, a first power management module 14, and a signal isolation conditioner 15, etc. The first end of the first communication module 13 serves as a communication end of the sensor transmitter unit 10, the first end of the first power management module 14 serves as a first common end of the sensor transmitter unit 10, the second end of the first power management module 14 serves as a second common end of the sensor transmitter unit 10, the third end of the first power management module 14 is electrically connected to the first end of the external power supply via a receiver, and the fourth end of the first power management module 14 is electrically connected to the second end of the external power supply. The model of the measuring sensor 11 may be PT100 or PT1000, etc. The model of the analog-to-digital converter 12 may be ADS1220, etc. The model of the first communication module 13 may be MAX485, etc. The model of the first power management module 14 may be AD74413R, etc.

[0047] In actual applications, when the power is normally supplied or when the power is cut off, the second power management module 32 manages the power supply to the control module 31 and the like.

[0048] See also Figures 2-3 As shown, in a possible embodiment, the extension unit 30 includes a second communication module 33 and a memory 34, the first end of the second communication module 33 serves as the communication end of the extension unit 30, the first end of the memory 34 is electrically connected to the second end of the second communication module 33, and the third end of the second communication module 33 and the second end of the memory 34 are electrically connected to the fifth end of the second power management module 32.

[0049] Exemplarily, the model of the memory 34 may be W25Q128 or the like.

[0050] In practical applications, by connecting the second communication module 33 with the first communication module 13, interference or conflict between signals can be prevented, ensuring stable transmission of measurement data. By setting up a single memory 34, sufficient storage capacity is guaranteed.

[0051] See also Figures 2-3 As shown, in a possible embodiment, the third terminal of the memory 34 is electrically connected to the fourth terminal of the control module 31 .

[0052] In practical applications, the control module 31 can communicate and interact with a computer or a mobile phone, etc., and can export the historical measurement data in the memory 34 .

[0053] See also Figures 2-3 As shown, in a possible embodiment, the extension unit 30 includes a display 35 , and an input end of the display 35 is electrically connected to a fourth end of the memory 34 .

[0054] By way of example, the display 35 may be a liquid crystal display 35 or a light emitting diode display 35 or the like.

[0055] In actual applications, the display 35 can display measurement data, the power level of the backup battery 40, the communication connection status and the fault status, etc., so as to facilitate the staff to understand the working status.

[0056] See also Figures 2-3 As shown, in a possible embodiment, the extension unit 30 includes a capacitor 36 , and the capacitor 36 is connected in parallel between the first end and the second end of the second power management module 32 .

[0057] In practical applications, when power is cut off, the charge stored in the capacitor 36 can provide a short-term power supply to the power switching module 20 to ensure that the switch of the power switching module 20 is successfully switched, thereby maintaining the stability of the circuit.

[0058] The present invention further provides a technical solution: a power switching method for a transmitter, the power switching method is applicable to the above-mentioned transmitter, comprising:

[0059] When the external power supply is normal, the power switching module 20 selects the extension unit 30 to be connected with the sensor transmitter unit 10, so that the external power supply sequentially provides the external power supply voltage to the sensor transmitter unit 10 and the extension unit 30, and then the sensor transmitter unit 10 sends the measurement data to the extension unit 30 for storage;

[0060] When the external power supply is normally cut off, the extension unit 30 sends a switching signal to the power switching module 20. The power switching module 20 selects to connect the backup battery 40 and the extension unit 30 according to the switching signal, so that the backup battery 40 provides the backup power supply voltage to the extension unit 30 and the sensor transmitter unit 10 in turn, and then the sensor transmitter unit 10 sends the measurement data to the extension unit 30 for storage.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transmitter, characterized in that: include: A sensor transmitter unit (10) for connecting to a receiver and external power supply, wherein the sensor transmitter unit (10) is configured to output measurement data; A power switching module (20), wherein the third end and the fifth end of the power switching module (20) are electrically connected to the first output end and the second output end of the sensor transmission unit (10) in a one-to-one correspondence; An expansion unit (30), wherein a communication end of the expansion unit (30) is electrically connected to a communication end of the sensor transmitter unit (10), a first input end and a second input end of the expansion unit (30) are electrically connected to a first end and a second end of the power switching module (20) in a one-to-one correspondence, a first output end and a second control end of the expansion unit (30) are both electrically connected between a first common end of the sensor transmitter unit (10) and a third end of the power switching module (20), a second output end of the expansion unit (30) is electrically connected between a second common end of the sensor transmitter unit (10) and a fifth end of the power switching module (20), a first control end of the expansion unit (30) is electrically connected to a controlled end of the power switching module (20), and the expansion unit (30) is configured to store the measurement data and output a switching signal when the external power supply is powered off; A backup battery (40), wherein a first end and a second end of the backup battery (40) are electrically connected to a fourth end and a sixth end of the power switching module (20) in a one-to-one correspondence, and the backup battery (40) is used to provide a backup power supply voltage; The power switching module (20) is used to select and conduct the backup battery (40) and the expansion unit (30) according to the switching signal.

2. A transmitter according to claim 1, characterized in that: The expansion unit (30) comprises a control module (31), a first end of the control module (31) serving as a first control end of the expansion unit (30), and a second end of the control module (31) serving as a second control end of the expansion unit (30).

3. A transmitter according to claim 2, characterized in that: The extension unit (30) comprises a second power management module (32), wherein a first end of the second power management module (32) serves as a first input end of the extension unit (30), a second end of the second power management module (32) serves as a second input end of the extension unit (30), a third end of the second power management module (32) serves as a first output end of the extension unit (30), a fourth end of the second power management module (32) serves as a second output end of the extension unit (30), and a fifth end of the second power management module (32) is electrically connected to a third end of the control module (31).

4. A transmitter according to claim 3, characterized in that: The extension unit (30) comprises a second communication module (33) and a memory (34), wherein a first end of the second communication module (33) serves as a communication end of the extension unit (30), a first end of the memory (34) is electrically connected to a second end of the second communication module (33), and a third end of the second communication module (33) and a second end of the memory (34) are electrically connected to a fifth end of the second power management module (32).

5. A transmitter according to claim 4, characterized in that: A third terminal of the memory (34) is electrically connected to a fourth terminal of the control module (31).

6. A transmitter according to claim 5, characterized in that: The expansion unit (30) comprises a display (35), and an input terminal of the display (35) is electrically connected to a fourth terminal of the memory (34).

7. A transmitter according to claim 3, characterized in that: The expansion unit (30) comprises a capacitor (36), and the capacitor (36) is connected in parallel between a first end and a second end of the second power management module (32).

8. A power switching method for a transmitter, the power switching method being applicable to a transmitter according to any one of claims 1 to 7, characterized in that: include: When the external power supply is normally supplied, the power switching module (20) selects the extension unit (30) to be connected with the sensor transmitter unit (10), so that the external power supply sequentially provides the sensor transmitter unit (10) and the extension unit (30) with an external power supply voltage, and then the sensor transmitter unit (10) sends the measurement data to the extension unit (30) for storage; When the external power supply is normally powered off, the expansion unit (30) sends the switching signal to the power switching module (20), and the power switching module (20) selects to conduct the backup battery (40) and the expansion unit (30) according to the switching signal, so that the backup battery (40) sequentially provides the backup power supply voltage to the expansion unit (30) and the sensor transmitter unit (10), and then the sensor transmitter unit (10) sends the measurement data to the expansion unit (30) for storage.

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