A new type of microwave level switch sensor system

Abstract

The present invention discloses a novel microwave level switch sensor system, comprising: multiple groups of microwave radiation units, the multiple groups of microwave radiation units are composed of multiple microwave transmitting ends and microwave receiving ends arranged one by one, and the microwave receiving end is used to receive microwave signals emitted by the microwave transmitting end, and also comprises: a transformer acquisition circuit and a signal processing circuit; the input end of the transformer acquisition circuit is connected to the power terminal, and the transformer acquisition circuit has a first secondary acquisition circuit and a second secondary acquisition circuit. In the present invention, the transmitting end and the receiving end of the microwave radiation unit communicate in time periods within a cycle, and can only communicate in the same time period; when communicating in different time periods, the receiving end will not receive the signal emitted by the transmitting end, which solves the interference between more than two pairs of microwave radiation units and does not affect the strength of the microwave signal.

Description

Technical Field

[0001] The invention relates to the technical field of microwave level switches, and in particular to a novel microwave level switch sensor system. Background Art

[0002] The microwave level switch is composed of a microwave transmitting end and a microwave receiving end in pairs, wherein the microwave transmitting end is composed of a microwave transmitter and a detector housing; the microwave receiving end is composed of a detector housing, a signal receiver, a signal detector, and an alarm control circuit.

[0003] During operation, the microwave transmitting end emits a microwave beam, and the microwave receiving end receives the microwave signal sent by the microwave transmitting end. When the signal received by the microwave receiving end remains unchanged or the change is not enough to reach the threshold of the receiver output alarm signal, the receiving end maintains a stable normal working signal output state. At this time, an invisible microwave wall is formed between the microwave transmitting end and the microwave receiving end. The sensor is installed in pairs at the position to be monitored. When there is no blockage at the monitoring position, the receiving end outputs a "no material" signal, that is, a no alarm state; when a blockage occurs at the monitoring position, the receiving end outputs a "blockage" signal, that is, an alarm state.

[0004] If two sets of microwaves are used simultaneously, since microwave emission is directional, the transmitter and receiver installed in the same group must be installed opposite to each other, or turned upside down 180° (such as Figure 1 As shown in the figure, when the misalignment is 90°, the receiving end will not be able to receive effective signals. However, in some actual working conditions, the signal from the transmitting end will enter the receiving end after reflection. When the misalignment is 90°, the interference cannot be completely shielded. At the same time, when the distance between the receiving end and the receiving end is too close, they will interfere with each other, resulting in unstable alarm points, which will cause the alarm status of the instrument output to change. Moreover, when the distance between the transmitting end and the receiving end is far, the microwave wall will be interfered by high-frequency signals (such as communication equipment such as walkie-talkies), causing the signal received by the receiving end to reach the threshold of the alarm signal, resulting in false alarms. Summary of the invention

[0005] The purpose of the present invention is to provide a novel microwave level switch sensor system to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a novel microwave level switch sensor system, comprising: a plurality of groups of microwave radiation units, the plurality of groups of microwave radiation units are composed of a plurality of microwave transmitting ends and microwave receiving ends arranged one by one, and the microwave receiving end is used to receive the microwave signal emitted by the microwave transmitting end, and also comprises: a transformer acquisition circuit and a signal processing circuit;

[0007] The input end of the transformer acquisition circuit is connected to the power supply terminal, the transformer acquisition circuit has a first secondary acquisition circuit and a second secondary acquisition circuit, and the second secondary acquisition circuit is connected to multiple groups of microwave radiation units through the unit power supply circuit through the output end;

[0008] The output end of the first secondary acquisition circuit is connected to the signal processing circuit through the signal acquisition circuit, and the signal processing circuit performs time synchronization and time-division processing on the signal through an algorithm.

[0009] As a further description of the above technical solution:

[0010] The signal processing circuit includes a 1nF capacitor, an NC7SZ14 chip and a single-chip microcomputer. The signal processing circuit transmits the signal input from the first secondary acquisition circuit to the 1nF capacitor for filtering, and then enters the NC7SZ14 chip to shape the waveform, and then transmits it to the single-chip microcomputer for processing. The single-chip microcomputer realizes timing synchronization through the rising edge of the acquisition signal, and then adds a delay to the rising edge for time period processing.

[0011] As a further description of the above technical solution:

[0012] The power module is a power terminal for 220V industrial frequency signal.

[0013] As a further description of the above technical solution:

[0014] Also includes a signal anti-interference circuit;

[0015] The signal anti-interference circuit is connected in the signal acquisition circuit connected between the first secondary acquisition circuit and the signal processing circuit, and the signal anti-interference circuit is used to perform optical coupling isolation on the power frequency signal acquired by the first secondary acquisition circuit.

[0016] As a further description of the above technical solution:

[0017] The signal anti-interference circuit includes a filtering circuit and an optocoupler processing circuit. The filtering circuit is used to first filter the industrial frequency signal collected by the first secondary collection circuit. The processed industrial frequency signal is shaped and isolated when transmitted to the optocoupler processing circuit to achieve unidirectional signal transmission.

[0018] As a further description of the above technical solution:

[0019] Also included is a signal strength analysis circuit;

[0020] The signal strength analysis circuit is connected to a plurality of microwave receiving ends;

[0021] The signal strength analysis circuit is used for collecting microwave signals received by multiple microwave receiving ends and displaying the signal strengths.

[0022] As a further description of the above technical solution:

[0023] The signal strength analysis circuit includes a voltage acquisition circuit, an I2C bus PCF8574 chip and an LED light group;

[0024] The voltage acquisition circuit acquires the voltage of the microwave signal ML, and then transmits it to the PCF8574 chip through the I2C bus. The LED light group is connected to the interface end of the PCF8574 chip, and the signal strength is displayed by the number of lights on the LED light group.

[0025] As a further description of the above technical solution:

[0026] A shielding tube cover is also sleeved on the internal main board of the microwave receiving end.

[0027] The present invention provides a novel microwave level switch sensor system, which has the following beneficial effects:

[0028] The transmitting end and the receiving end of the microwave radiation unit of the novel microwave level switch sensor system communicate in time periods within a cycle, and can communicate only within the same time period; when communicating in different time periods, the receiving end will not receive the signal sent by the transmitting end, which solves the interference between the two pairs of microwave radiations and does not affect the strength of the microwave signal. The power frequency signal is collected through the secondary of the transformer. The transformer has two secondaries, which correspond to two groups of output coils respectively. The two groups of output coils do not interfere with each other. One group is responsible for powering the unit, and the other group is responsible for collecting signals. This method avoids the interference of components in the circuit to the power frequency signal under some working conditions, effectively ensures the stability of the collected signal, and sets a signal anti-interference circuit to perform optical coupling isolation on the power frequency signal collected by the first secondary collection circuit, so as to realize unidirectional transmission of the signal and improve the anti-interference ability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the arrangement of multiple microwave transmitting ends and microwave receiving ends in a microwave radiation unit in the prior art;

[0030] Figure 2 A schematic diagram of a novel microwave level switch sensor system provided by the present invention;

[0031] Figure 3 It is a schematic diagram of the transformer acquisition circuit in the present invention;

[0032] Figure 4 It is a circuit structure schematic diagram of the transformer acquisition circuit in the present invention;

[0033] Figure 5 Schematic diagram of the circuit structure of the signal anti-interference circuit in the present invention;

[0034] Figure 6 is a schematic diagram of the circuit structure of the signal processing circuit in the present invention;

[0035] Figure 7 It is a circuit structure schematic diagram of the voltage acquisition circuit in the present invention;

[0036] Figure 8 Schematic diagram of the circuit structure of the I2C bus in the present invention;

[0037] Fig. 9 It is a schematic diagram of the circuit structure of the PCF8574 chip in the present invention;

[0038] Fig.10 It is a schematic diagram of the circuit structure of the LED lamp group in the present invention.

[0039] Legend:

[0040] 10. Microwave radiation unit; 1. Microwave transmitting end; 2. Microwave receiving end; 3. Power supply module; 4. Transformer acquisition circuit; 41. First secondary acquisition circuit; 42. Second secondary acquisition circuit; 5. Signal anti-interference circuit; 6. Signal processing circuit; 7. Signal strength analysis circuit. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figure 1-10 A novel microwave level switch sensor system includes: a plurality of microwave radiation units 10, the plurality of microwave radiation units 10 are composed of a plurality of microwave transmitting ends 1 and microwave receiving ends 2 arranged one by one, and the microwave receiving end 2 is used to receive the microwave signal emitted by the microwave transmitting end 1, and also includes: a transformer acquisition circuit 4 and a signal processing circuit 6;

[0043] like Figure 4 As shown, (JP1 is the power supply terminal of the 220V industrial frequency signal, A1 / A2: responsible for powering the unit, T2 / T1: responsible for collecting signals) the input end of the transformer collection circuit 4 is connected to the power module 3, the transformer collection circuit 4 has a first secondary collection circuit 41 and a second secondary collection circuit 42, and the second secondary collection circuit 42 is connected to the multiple groups of microwave radiation units 10 through the unit power supply circuit through the output end;

[0044] The output end of the first secondary acquisition circuit 41 is connected to the signal processing circuit 6 through the signal acquisition circuit. The signal processing circuit 6 performs time synchronization and time-division processing on the signal through an algorithm.

[0045] Specifically, the power frequency signal is collected through the secondary of the transformer collection circuit 4. The transformer has a first secondary collection circuit 41 and a second secondary collection circuit 42, which correspond to two groups of output coils respectively. The two groups of output coils do not interfere with each other. The second secondary collection circuit 42 is responsible for powering the unit, and the first secondary collection circuit 41 is responsible for collecting signals. This method avoids the interference of components in the circuit to the power frequency signal under some working conditions. When the 220V power supply voltage is unstable, the interference of the power frequency signal of the loaded coil will be more obvious, and the unloaded power frequency signal will be relatively stable. This can effectively ensure the stability of the collected signal.

[0046] The new microwave level switch sensor system divides the communication between the transmitting end and the receiving end of the microwave radiation unit in a period of time within a cycle, and can only communicate in the same period of time; when communicating in different time periods, the receiving end will not receive the signal sent by the transmitting end. For example, there are two sets of microwave radiation units 10, the first set of units are set to the 1st gear for transmission and reception, and the second set is set to the 2nd gear. Because the time periods are inconsistent, the receiving end can only communicate with the transmitting end corresponding to its gear, and will not receive signals from other time periods. The interference between the two pairs of microwave radiation is solved, and the strength of the microwave signal will not be affected.

[0047] In another embodiment provided by the present invention, further, the novel microwave level switch sensor system collects 220V, 50HZ power frequency signals, divides the power frequency signals into 4 bands with a period of 20ms, and each band is 5ms. When the signal is transmitted in band 1, bands 2, 3, and 4 are closed. Similarly, band 2 is opened and bands 1, 3, and 4 are closed, and so on. Thus, interference signals in different frequency bands are shielded, and four pairs of microwaves are used for communication at the same time without affecting the strength of the microwave signal.

[0048] like Figure 6 As shown, the signal processing circuit 6 includes a 1nF capacitor, an NC7SZ14 chip and a single-chip microcomputer. The signal processing circuit 6 transmits the signal input by the first secondary acquisition circuit 41 to the 1nF capacitor for filtering and then enters the NC7SZ14 chip to shape the waveform, and then transmits it to the single-chip microcomputer for processing. The single-chip microcomputer realizes timing synchronization by collecting the rising edge of the signal, and then adds a delay to the rising edge for time period processing.

[0049] Specifically, the collected signal is first filtered by a 1nF capacitor, then enters NC7SZ14 to shape the waveform, and then enters the microcontroller. The microcontroller achieves timing synchronization through the rising edge of the collected signal, and then adds a delay to the rising edge for time period processing.

[0050] The power module 3 is a power terminal for 220V industrial frequency signals.

[0051] Also includes a signal anti-interference circuit 5;

[0052] like Figure 5 As shown, the signal anti-interference circuit 5 is connected to the signal acquisition circuit connected between the first secondary acquisition circuit 41 and the signal processing circuit 6, and the signal anti-interference circuit 5 is used to perform optical coupling isolation on the power frequency signal collected by the first secondary acquisition circuit 41.

[0053] The signal anti-interference circuit 5 includes a filtering circuit and an optical coupling processing circuit. The filtering circuit is used to filter the power frequency signal collected by the first secondary collection circuit 41. The processed power frequency signal is shaped and isolated when transmitted to the optical coupling processing circuit to realize unidirectional signal transmission.

[0054] Specifically, in order to reduce the interference of subsequent circuits on the signal, the signal collected by the transformer acquisition circuit 4 is first filtered, and then the signal is shaped and isolated by an optocoupler (the optocoupler is similar to a transistor signal that can only flow from OP1 to OP2), so as to realize unidirectional transmission of the signal and improve the anti-interference ability of the circuit.

[0055] like Figure 7-10 As shown, it also includes a signal strength analysis circuit 7;

[0056] The signal strength analysis circuit 7 is connected to the plurality of microwave receiving terminals 2;

[0057] The signal strength analysis circuit 7 is used to collect microwave signals received by multiple microwave receiving ends 2 and display the signal strengths.

[0058] The signal strength analysis circuit 7 includes a voltage acquisition circuit, an I2C bus PCF8574 chip and an LED light group;

[0059] The voltage acquisition circuit collects the voltage of the microwave signal ML, and then transmits it to the PCF8574 chip through the I2C bus. The LED light group is connected to the interface end of the PCF8574 chip, and the signal strength is displayed by the number of lights on the LED light group.

[0060] Specifically, since the strength of microwave signals cannot be captured by ordinary equipment, in some specific working conditions, the working range of the instrument needs to be determined by the signal strength on site, so that the performance of the instrument can be better. Therefore, the microwave signal strength needs to be expressed by collecting the voltage of the microwave signal ML through the voltage collection circuit, and then passing the signal to the PCF8574 chip through I2C, so that the signal strength is reflected on a group of LED light groups. Among them, the more LED light groups are on, the greater the signal strength, and vice versa, the smaller the signal strength.

[0061] A shielding tube cover is also sleeved on the internal main board of the microwave receiving end 2.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of microwave level switch sensor system, comprising: A plurality of groups of microwave radiation units (10), wherein the plurality of groups of microwave radiation units (10) are composed of a plurality of microwave transmitting ends (1) and microwave receiving ends (2) arranged one by one in opposition to each other, and the microwave receiving ends (2) are used to receive microwave signals emitted by the microwave transmitting ends (1), and are characterized in that they further include: a transformer collection unit (4) and a signal processing module (6); The input end of the transformer acquisition unit (4) is connected to the power supply module (3), the transformer acquisition unit (4) comprises a first secondary acquisition module (41) and a second secondary acquisition module (42), and the second secondary acquisition module (42) is connected to the plurality of microwave radiation units (10) via the output end through a unit power supply circuit; The output end of the first secondary acquisition module (41) is connected to the signal processing module (6) through a signal acquisition circuit, the signal processing module (6) performs time sequence synchronization and time period processing on the signal through an algorithm, and the output end of the signal processing module (6) is connected to a plurality of groups of microwave radiation units (10) through the signal acquisition circuit; The power frequency signal is collected by the transformer collection unit at the secondary level. The transformer has a first secondary collection module and a second secondary collection module, which correspond to two sets of output coils respectively. The two sets of output coils do not interfere with each other. The second secondary collection module is responsible for powering the unit, and the first secondary collection module is responsible for collecting signals. The signal processing module (6) comprises a 1nF capacitor, an NC7SZ14 chip and a single-chip microcomputer. The signal processing module (6) transmits the signal input by the first secondary acquisition module (41) to the 1nF capacitor for filtering, then enters the NC7SZ14 chip to shape the waveform, and then transmits it to the single-chip microcomputer for processing. The single-chip microcomputer realizes timing synchronization by collecting the rising edge of the signal, and then adds a delay to the rising edge for time-division processing. The power supply module (3) is a power supply terminal for a 220V industrial frequency signal.

2. A novel microwave level switch sensor system according to claim 1, characterized in that: It also includes a signal anti-interference module (5); The signal anti-interference module (5) is connected to a signal acquisition circuit connected between the first secondary acquisition module (41) and the signal processing module (6), and the signal anti-interference module (5) is used to perform optical coupling isolation on the power frequency signal acquired by the first secondary acquisition module (41).

3. A novel microwave level switch sensor system according to claim 2, characterized in that: The signal anti-interference module (5) comprises a filtering module and an optical coupling processing module. The filtering module is used to first filter the power frequency signal collected by the first secondary collection module (41). The processed power frequency signal is shaped and isolated when transmitted to the optical coupling processing module, thereby realizing unidirectional signal transmission.

4. A novel microwave level switch sensor system according to claim 1, characterized in that: Also includes a signal strength analysis module (7); The signal strength analysis module (7) is connected to a plurality of microwave receiving ends (2); The signal strength analysis module (7) is used to collect microwave signals received by a plurality of microwave receiving ends (2) and to display the signal strengths.

5. A novel microwave level switch sensor system according to claim 4, characterized in that: The signal strength analysis module (7) comprises a voltage acquisition circuit, an I2C bus PCF8574 chip and an LED light group; The voltage acquisition circuit acquires the voltage of the microwave signal ML, and then transmits it to the PCF8574 chip through the I2C bus. The LED light group is connected to the interface end of the PCF8574 chip, and the signal strength is displayed by the number of lights on the LED light group.

6. A novel microwave level switch sensor system according to claim 1, characterized in that: A shielding tube cover is also sleeved on the internal main board of the microwave receiving end (2).

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