Active and passive automatic switching type signal interface module device

Abstract

The utility model relates to an active and passive automatic switching type signal interface module device, which comprises a power supply conversion module, an input acquisition module and an output current module, and signals input by the input acquisition module come from passive signal acquisition equipment or active signal acquisition equipment; the input end of the power supply conversion module can be connected with an external power supply or can not be connected with the external power supply; the input acquisition module can switch an active mode or a passive mode, and the passive mode directly processes an output signal of the passive signal acquisition device and outputs the output signal through the output current module. In the active mode, an output signal of the active signal acquisition equipment is processed by the power conversion module and the input acquisition module in sequence and is finally output by the output current module. According to the utility model, an active signal interface module and a passive signal interface module are supported, a user does not need to worry about no power supply when accessing signals, and the problem that a product cannot work due to lack of power supply equipment is solved.

Description

Technical Field

[0001] The utility model relates to a technology for intelligently identifying transmitter types, in particular to an active-passive automatic switching signal interface module device. Background Art

[0002] like Figure 1 As shown, for passive products: when the input is a DC signal, connect terminals 3-4.

[0003] Passive transmitter disadvantages: usually cannot provide signal amplification or other complex signal processing functions, so the function may be limited in some applications.

[0004] like Figure 2 As shown, for active products: Transmitter terminals 9-10 are connected to a 24VDC power supply. When the input is a DC signal, connect terminals 1-2; when the two-wire transmitter signal is used, connect terminals 3-4.

[0005] Active transmitter defects: usually require an external power supply to drive the amplifier or other active components. The product cannot work properly without power supply. Utility Model Content

[0006] The utility model designs an active-passive automatic switching signal interface module device, which solves the technical problem that the existing active or passive transmitters each have their own technical defects, and there is no product on the market that can take into account both modes or switch freely.

[0007] In order to solve the above-mentioned technical problems, the utility model adopts the following solutions:

[0008] An active-passive automatic switching signal interface module device is characterized in that it includes a power conversion module, an input acquisition module and an output current module, the signal input to the input acquisition module comes from a passive signal acquisition device or an active signal acquisition device; the input end of the power conversion module can be connected to an external power supply, or can also be not connected to an external power supply; the input acquisition module can switch between active and passive modes, the passive mode directly processes the output signal of the passive signal acquisition device and outputs it through the output current module, or the active mode processes the output signal of the active signal acquisition device in sequence through the power conversion module and the input acquisition module and finally outputs it through the output current module.

[0009] Preferably, the input acquisition module includes a switching module circuit, a current acquisition and conversion circuit, and an oscillation circuit. The input end of the switching module circuit is connected to the output end of a passive signal acquisition device or an active signal acquisition device; the first output end of the switching module circuit is connected to the first input end of the oscillation circuit through the current acquisition and conversion circuit, and the second output end of the switching module circuit is directly connected to the second input end of the oscillation circuit; the switching module circuit is responsible for switching the input signal and outputting the power distribution signal, the current acquisition and conversion circuit collects and amplifies the analog current and transmits it to the oscillation circuit, and the oscillation circuit processes the signal and outputs it, which is transmitted to the subsequent stage of the transformer and output in the output current module.

[0010] Preferably, when the active signal acquisition device is used, the input signal type of the switching module circuit is two-wire or three-wire system or 4-20mA; when the passive signal acquisition device is used, the input signal of the switching module circuit is 4-20mA.

[0011] Preferably, the power conversion module includes a voltage conversion circuit, a transformer coil drive circuit, a transformer, a first AC voltage rectification and filtering circuit, a second AC voltage rectification and filtering circuit, and a third AC voltage rectification and filtering circuit; the voltage conversion circuit is connected to the transformer through the transformer coil drive circuit, and the output end of the transformer is respectively connected to the first AC voltage rectification and filtering circuit, the second AC voltage rectification and filtering circuit, and the third AC voltage rectification and filtering circuit; the input end of the voltage conversion circuit is connected to an external power supply, the output end of the first AC voltage rectification and filtering circuit is connected to the input end of the transmission oscillation circuit, the output end of the second AC voltage rectification and filtering circuit is connected to the switching module circuit for power distribution to the front-end active signal acquisition device, and the output end of the third AC voltage rectification and filtering circuit is connected to the input end of the current acquisition and conversion circuit.

[0012] Preferably, the external power supply is an external 20-35VDC power supply.

[0013] Preferably, the output current module includes an output shaping circuit, and the AC signal output by the oscillation circuit is converted into a DC current signal by the output shaping circuit and filtered and output.

[0014] The active and passive automatic switching type signal interface module device has the following beneficial effects:

[0015] The utility model supports one-way input and one-way output; the product type is determined by whether a power supply is connected, and it supports being used as both an active and a passive signal interface module. When connecting a signal, there is no need to worry about the lack of a power supply, and the product will not fail to work due to the lack of a power supply device. Description of the Drawings

[0016] Figure 1 : Schematic diagram of the signal interface of a passive transmitter in the prior art;

[0017] Figure 2 : Schematic diagram of the signal interface of the active transmitter in the prior art;

[0018] Figure 3 : Schematic diagram of the signal interface of the signal interface module device with automatic active and passive switching of the present utility model;

[0019] Figure 4 : Schematic diagram of the circuit connection of the signal interface module device with automatic active and passive switching of the present utility model.

[0020] Description of the reference numerals:

[0021] 1 - Power conversion circuit;

[0022] 2 - Input acquisition circuit;

[0023] 3 - Output current circuit;

[0024] 11 - Voltage conversion circuit, and the external 20 - 35VDC power supply is regulated through the voltage conversion circuit;

[0025] 12 - Transformer coil drive circuit;

[0026] 13 - Transformer;

[0027] 14 - First AC voltage rectification and filtering circuit, and the output is used for the oscillation circuit;

[0028] 15 - Second AC voltage rectification and filtering circuit, and the output is used for the power distribution circuit;

[0029] 16 - Third AC voltage rectification and filtering circuit, and the output is used for the current acquisition and conversion circuit;

[0030] 21 - Switching module circuit, responsible for switching the input signal and outputting the power distribution signal;

[0031] 22 - Current acquisition and conversion circuit, which collects and amplifies the analog current and transmits it to the oscillation circuit;

[0032] 24 - Oscillation circuit, which processes the signal and outputs it, and transmits it to the subsequent stage of the mutual inductor;

[0033] 31 - Output shaping circuit, and the AC signal output by the oscillation circuit is converted into a DC current signal and filtered and output through this circuit. Detailed implementation manner

[0034] The following is combined with Figures 3 to 4 , and further description is made for the present utility model:

[0035] As Figure 3As shown in the figure, for the active and passive automatic switching type signal interface module device of the present utility model, when the power supply is connected to terminals 9 - 10, the product is an active type product. When the input is a two-wire transmitter signal, connect terminals 3 - 4, and for DC signals, connect terminals 1 - 2; when there is no power supply, the product is a passive type product. When the input is a DC signal, connect terminals 3 - 4.

[0036] Therefore, the active and passive automatic switching type signal interface module device of the present utility model has a switchable mode between active and passive.

[0037] As Figure 4 shown in the figure, the circuit block diagram of the active and passive automatic switching type signal interface module device of the present utility model includes a power conversion module 1, an input acquisition module 2, and an output current module 3. The signal input to the input acquisition module 2 comes from a passive signal acquisition device or an active signal acquisition device; the input end of the power conversion module 1 can be connected to an external power supply or can also not be connected to an external power supply; the input acquisition module 2 can switch between active and passive modes. In the passive mode, the output signal of the passive signal acquisition device is directly processed and output through the output current module 3. Or, in the active mode, the output signal of the active signal acquisition device is sequentially processed by the power conversion module 1 and the input acquisition module 2 and finally output through the output current module 3.

[0038] The input acquisition module 2 includes a switching module circuit 21, a current acquisition and conversion circuit 22, and an oscillation circuit 24. The input end of the switching module circuit 21 is connected to the output end of the passive signal acquisition device or the active signal acquisition device; the first output end of the switching module circuit 21 is connected to the first input end of the oscillation circuit 24 through the current acquisition and conversion circuit 22, and the second output end of the switching module circuit 21 is directly connected to the second input end of the oscillation circuit 24; the switching module circuit 21 is responsible for the switching of the input signal and the output of the power distribution signal. The current acquisition and conversion circuit 22 amplifies the analog current acquisition and transmits it to the oscillation circuit 24. The oscillation circuit 24 processes the signal and outputs it, which is transmitted to the subsequent stage of the current transformer and output in the output current module 3. When it is an active signal acquisition device, the input signal type of the switching module circuit 21 is two-wire, three-wire, or 4 - 20mA; when it is a passive signal acquisition device, the input signal of the switching module circuit 21 is 4 - 20mA.

[0039] The power conversion module 1 includes a voltage conversion circuit 11, a transformer coil driving circuit 12, a transformer 13, a first AC voltage rectifying and filtering circuit 14, a second AC voltage rectifying and filtering circuit 15, and a third AC voltage rectifying and filtering circuit 16; the voltage conversion circuit 11 is connected to the transformer 13 through the transformer coil driving circuit 12, and the output terminals of the transformer 13 are respectively connected to the first AC voltage rectifying and filtering circuit 14, the second AC voltage rectifying and filtering circuit 15, and the third AC voltage rectifying and filtering circuit 16; the input terminal of the voltage conversion circuit 11 is connected to an external power supply, the output terminal of the first AC voltage rectifying and filtering circuit 14 is connected to the input terminal of the transfer oscillation circuit 24, the output terminal of the second AC voltage rectifying and filtering circuit 15 is connected to the switching module circuit 21 for power distribution to the front-end active signal acquisition device, and the output terminal of the third AC voltage rectifying and filtering circuit 16 is connected to the input terminal of the current acquisition and conversion circuit 22. The external power supply is an external 20 - 35VDC power supply.

[0040] The output current module 3 includes an output shaping circuit 31, and the AC signal output by the oscillation circuit 24 is converted into a DC current signal by the output shaping circuit 31 and filtered for output.

[0041] The above has made an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the implementation of the present invention is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An active and passive automatic switching type signal interface module device, characterized in that: It includes a power conversion module (1), an input acquisition module (2), and an output current module (3). The signal input by the input acquisition module (2) comes from a passive signal acquisition device or an active signal acquisition device. The input end of the power conversion module (1) can be connected to an external power supply or can also not be connected to an external power supply. The input acquisition module (2) can switch between the active or passive mode. In the passive mode, it directly processes the signal output by the passive signal acquisition device and outputs it through the output current module (3). Or, in the active mode, the signal output by the active signal acquisition device is processed successively through the power conversion module (1) and the input acquisition module (2) and finally also outputs through the output current module (3).

2. The active and passive automatic switching type signal interface module device according to claim 1, characterized in that: The input acquisition module (2) includes a switching module circuit (21), a current acquisition and conversion circuit (22), and an oscillation circuit (24). The input end of the switching module circuit (21) is connected to the output end of the passive signal acquisition device or the active signal acquisition device. The first output end of the switching module circuit (21) is connected to the first input end of the oscillation circuit (24) through the current acquisition and conversion circuit (22), and the second output end of the switching module circuit (21) is directly connected to the second input end of the oscillation circuit (24). The switching module circuit (21) is responsible for the switching of the input signal and the output of the power distribution signal. The current acquisition and conversion circuit (22) collects and amplifies the analog current and transmits it to the oscillation circuit (24). The oscillation circuit (24) processes the signal and outputs it, which is transmitted to the subsequent stage of the transformer and outputs at the output current module (3).

3. The active and passive automatic switching type signal interface module device according to claim 2, characterized in that: When it is an active signal acquisition device, the input signal type of the switching module circuit (21) is two-wire, three-wire, or 4-20 mA. When it is a passive signal acquisition device, the input signal of the switching module circuit (21) is 4-20 mA.

4. The active and passive automatic switching type signal interface module device according to claim 3, characterized in that: The power conversion module (1) includes a voltage conversion circuit (11), a transformer coil drive circuit (12), a transformer (13), a first AC voltage rectification and filtering circuit (14), a second AC voltage rectification and filtering circuit (15), and a third AC voltage rectification and filtering circuit (16). The voltage conversion circuit (11) is connected to the transformer (13) through the transformer coil drive circuit (12). The output end of the transformer (13) is respectively connected to the first AC voltage rectification and filtering circuit (14), the second AC voltage rectification and filtering circuit (15), and the third AC voltage rectification and filtering circuit (16). The input end of the voltage conversion circuit (11) is connected to the external power supply. The output end of the first AC voltage rectification and filtering circuit (14) is connected to the input end of the transmission oscillation circuit (24). The output end of the second AC voltage rectification and filtering circuit (15) is connected to the switching module circuit (21) for power distribution to the front-end active signal acquisition device. The output end of the third AC voltage rectification and filtering circuit (16) is connected to the input end of the current acquisition and conversion circuit (22).

5. The active and passive automatic switching type signal interface module device according to claim 4, characterized in that: The external power supply is an external 20 - 35 VDC power supply.

6. The active and passive automatic switching type signal interface module device according to any one of claims 2-5, characterized in that: The output current module (3) includes an output shaping circuit (31). The AC signal output by the oscillation circuit (24) is converted into a DC current signal by the output shaping circuit (31) and filtered for output.

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