A control circuit suitable for identification, driving and signal sampling of multiple probes

Abstract

The present invention relates to a control circuit suitable for identifying, driving, and sampling signals from multiple probes. The control circuit includes probes and a control module, the control module including an output terminal and a sampling terminal; a conductive component connected to the output terminal of the control module and the probes, respectively, and the control module switches the control circuit between an identification state and a normal operating state by controlling the on / off switching of the conductive component; and a power module connected to the conductive component and the probes, respectively, to form a first branch and a second branch. The sampling terminal of the control module is connected between the conductive component and the probes, and when the control circuit is in the identification state, it periodically collects electrical information n times and analyzes the collected electrical information to identify whether the probe is an IR type or a PIR type. The circuit has a simple structure, reduces production costs, and has high judgment and operation accuracy.

Description

Technical Field

[0001] The present invention relates to the field of probe technology, and in particular to a control circuit suitable for identifying and driving multiple probes and sampling signals. Background Art

[0002] Probes are widely used in cabinets and other places. There are many types of probes. The current mainstream types are IP probes and PIR probes. Different probes require corresponding probe controllers to play their corresponding functions. That is, IP probes must be matched with IP controllers to play the role of non-contact hand-wave switch, dimming, door switch, etc. PIR probes need to be paired with PIR controllers to detect human presence and achieve delay control.

[0003] This one-to-one matching requirement means that if different functions are to be implemented in the system, multiple sets of probes and controllers of various types must be prepared in advance. This not only brings difficulties in assembly and disassembly, but also causes the existing control circuits that can only provide drive and signal sampling for the corresponding probes to be redesigned due to the replacement of the controller, resulting in a sharp increase in production costs and great inconvenience.

[0004] To overcome this problem, some manufacturers have built-in control modules into the probes, enabling data communication between the controller and the control module inside the probe to identify the probe and its signal. This approach effectively solves the problem of a single controller being limited to one type of probe, making it possible to control multiple probes with a single controller, achieving product versatility.

[0005] However, this method increases the structural complexity of the probe, making the probe larger in size. In systems such as cabinets, most probes are embedded in the side of a wooden board with a thickness of about 18 mm. The changed probe is undoubtedly unable to meet existing application requirements, and has to be improved based on the original volume and size. This in turn puts higher requirements on the design of the probe, which artificially increases the production cost. Summary of the Invention

[0006] In view of the above problems, an object of the present invention is to provide a control circuit with a simple design that can effectively identify different probes and provide corresponding driving and signal sampling for them.

[0007] In order to achieve the above object, the technical solution of the present invention is: a control circuit suitable for identification, driving and signal sampling of multiple probes, the control circuit includes a probe, and is characterized in that: the control circuit also includes,

[0008] A control module, the control module comprising an output terminal and a sampling terminal;

[0009] A conducting component, wherein the conducting component is connected to the output terminal of the control module and the probe respectively, and the control module switches the control circuit between the identification state and the normal working state by controlling the on and off of the conducting component;

[0010] a power supply module, the power supply module being connected to the conductive component and the probe to form a first branch and a second branch respectively;

[0011] The sampling end of the control module is connected between the conductive component and the probe, and when the control circuit is in the identification state, the electrical information is periodically collected n times and the collected electrical information is analyzed to identify whether the probe is an IR type or a PIR type.

[0012] Furthermore, the control module further includes a signal terminal connected between the power module and the probe to sample signals from the IR probe when the control circuit is in a normal working state, and the sampling terminal collects signals from the PIR probe when the control circuit is in a normal working state;

[0013] The normal working state corresponds to that the probe type is successfully identified and the control module enables the first branch to drive the IR probe or the second branch to drive the PIR probe according to the probe type.

[0014] Furthermore, when the control circuit is in the identification state, the conductive component is turned on, and when the control circuit is in the normal working state, the conductive component is turned off.

[0015] Furthermore, the electrical information is the voltage output by the probe, and the analysis includes calculating an average value of the n voltages collected and a difference between a maximum voltage and a minimum voltage collected.

[0016] Furthermore, the control circuit also includes an amplification module that can amplify the information collected by the signal end.

[0017] Furthermore, a first resistor and a second resistor connected in parallel are provided between the conductive component and the probe.

[0018] Furthermore, a third resistor is provided between the power module and the probe.

[0019] Furthermore, the amplification module includes an amplification circuit, a first filter capacitor and a second filter capacitor;

[0020] One end of the first filter capacitor is connected between the third resistor and the probe and the other end is grounded;

[0021] One end of the second filter is connected to the third resistor and the other end is connected to the control module through the amplifier circuit.

[0022] Furthermore, the conducting component is a PNP transistor, the time period corresponding to the periodicity is 15ms, and the value of n is 4.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The control circuit is designed according to the basic circuit characteristics of the probe. Combined with the output voltage characteristics of the IR probe and the PIR probe, the collected voltage average value and the difference between the maximum and minimum voltages are analyzed. This can accurately determine the probe type. Based on the probe type, different drive modes and signal sampling are selected by controlling the on and off of the conductive components. This allows the same control circuit to be applied to different probes and provide drive and signal acquisition for different probes, thereby improving the circuit applicability. In addition, the circuit design is simple and ingenious, greatly reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural block diagram of a control circuit applicable to the identification, driving and signal sampling of multiple probes in this application.

[0026] Figure 2 This is a schematic diagram of a preferred circuit for a control circuit suitable for identification, driving, and signal sampling of multiple probes in this application.

[0027] Figure 3 This is the internal circuit schematic diagram of the IP probe commonly used in the industry.

[0028] Figure 4 This is the internal circuit schematic diagram of a PIR probe commonly used in the industry. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] Figure 1 The following is a block diagram showing the structure of the control circuit applicable to the identification, driving and signal sampling of multiple probes in this application. Figure 2 This is the preferred embodiment corresponding to the control circuit. Figure 1As shown, the control circuit includes a probe 1, a control module 2, a conductive component 3 and a power module 4. The control module 2 includes an output terminal SO and a sampling terminal EO. The conductive component 3 is connected to the output terminal SO of the control module 2 and the probe 1 respectively. The control module 2 outputs a high and low level through the output terminal SO to control the on and off of the conductive component 3, so that the control circuit switches between the identification state and the normal working state. The power module 4 is connected to the conductive component 3 and the probe 1 respectively to form a first branch Q1 and a second branch Q2, and the sampling terminal EO of the control module 2 is connected between the conductive component 3 and the probe 1. When the control circuit is in the identification state, it can periodically collect electrical information n times and analyze the collected electrical information to identify whether the probe is an IR or PIR type.

[0031] As mentioned in the background technology, the current circuit cannot identify and match multiple probes. Only one probe corresponds to one controller, which greatly increases the production cost. The method of building a control module into the probe seems to reduce the cost, but in fact, it affects the applicability of the probe because it causes the probe to increase in volume and size, which is not advisable.

[0032] like Figure 3 As shown in the figure, an infrared emitting diode is connected between pin 1 of the IR probe interface and the ground. When the infrared emitting diode is turned on, it will output a stable voltage. PIR1 in the PIR probe is a digital probe. When no human signal is detected, it will continue to output a low level. The output current pulling capability of the PIR probe is also low. When the PIR probe outputting a low level is connected to a high level circuit, the high level will be pulled down, resulting in a large difference between the highest and lowest output voltages.

[0033] To facilitate sampling and analysis, in this application, the electrical information is the voltage collected at the sampling end. The analysis includes calculating the average of the n voltages collected and the difference between the maximum and minimum voltages collected. This allows the application to utilize the above-mentioned basic circuit characteristics of the probe to collect and analyze the voltage signal, thereby accurately identifying the probe type without redesigning the circuit or replacing the controller, thus reducing production costs.

[0034] As a preference, the control circuit of the present application is in the identification state corresponding to the conduction component being turned on, and is in the normal working state corresponding to the conduction component being turned off. Figure 2 As shown, the conducting component in this embodiment preferably adopts a PNP transistor Q4.

[0035] As mentioned above, the probe 1 includes an IP probe and a PIR probe. The control module 2 of this control circuit will enable the first branch or the second branch to drive the probe according to the probe type. Specifically, when the probe is an IP probe, the control module 2 will control the conductive component 3 to enable the first branch Q1 to power the probe. When the probe is a PIR probe, the probe is directly powered by the second branch Q2. The distinction between the driving branches here is also determined based on the basic circuit characteristics of the two probes.

[0036] When the control circuit is in the identification state, control module 2 starts and outputs a low level to the SO pin. While the SO pin is low, Q4 is turned on, and the voltage of power module 4 is applied to pin 1 of probe 1. After the SO pin is pulled low, the EO pin voltage is detected. After a delay of a certain period (here, 15ms is selected), another sampling is performed. After approximately n consecutive sampling times (here, n is 4), the SO pin is output a high level.

[0037] Clearly, based on the probe's characteristics, the purpose of turning on Q4 here is primarily to ensure that, when an IP probe is connected, the first branch Q1 can provide power for subsequent voltage sampling. However, if a PIR probe is connected, its characteristics indicate that it will be powered directly by the second branch Q2. Specifically, the PIR probe's power pin is connected to power module 4 via pin 3 of the probe interface, and the PIR probe's output pin is connected to pin 1 of the probe interface. In this application, the power module's VCC voltage is 3.3V, as the typical operating voltage of a PIR probe is less than 3.6V.

[0038] The reason for using a transistor is that the PIR probe's output can be high or low. As discussed earlier, when the output is low, the average and differential voltages can quickly distinguish whether the installed probe is an IR or PIR probe. The difficulty lies in that if the PIR probe outputs high, the four voltages measured by the control module's sampling terminals will all be greater than 3V, the same as if no probe is connected. In this case, it's impossible to distinguish whether the PIR probe is connected or not. Using a transistor effectively utilizes its basic characteristics to distinguish between these two situations, as detailed below.

[0039] The infrared emitting diode of the IR probe will conduct normally when the control circuit is in the identification state. The voltage range of the diode is between 1.0-1.2V (related to the driving current, but the fixed current basically remains unchanged). If the average value of the voltage sampled four times is basically within this range and the difference between the maximum voltage and the minimum voltage value is less than 0.1V, it can be determined that the probe is connected to an IR probe.

[0040] Combine Figure 4If the voltage collected by the sampling end drops linearly from 3.3V, the average value of the four sets of data is small, especially the difference between the maximum voltage and the minimum voltage is large, then it can be determined that the currently connected probe is a PIR probe, and the probe is outputting a low level at this time.

[0041] If all four measured voltage values ​​are greater than 3V, the SO pin will output a high level after four consecutive samples, as configured above. To distinguish whether a PIR probe is connected or not, continue sampling at a fixed interval (15ms is still selected here) after Q4 turns off, collecting voltage data four times in total. If the high level is caused by the PIR probe sensing a human body signal and causing the RAL pin to output a high level, then all four sets of data collected the second time will still be greater than 3V. If the high level is caused by the absence of a probe, the charge discharge from Q4's C-stage will cause each sampled value to be smaller than the previous one during the four interval sampling. This will cause the calculated voltage average to be less than 3V, and the difference between the maximum and minimum voltages to be greater than 1V. This method can easily distinguish whether a PIR probe is connected but is only outputting a high level due to a human body signal, or whether the probe is not connected, thus achieving accurate judgment and identification.

[0042] It is worth mentioning that the transistor can also be replaced by other shutdown devices, such as MOS tubes, as long as it can achieve functions and effects similar to those of the transistor.

[0043] After identifying the probe type, the control circuit switches to normal operation, turning off Q4. To ensure timely and accurate acquisition of probe information, the control module 2 also includes a signal terminal SIG connected between the power module 4 and the probe 1 to sample the IR probe signal when the control circuit is in normal operation. For PIR probes, the sampling terminal EO directly samples the PIR probe signal.

[0044] As previously described for the IP probe, control module 2 conducts every m seconds to activate first branch Q1, powering the IR probe and ensuring normal operation. Otherwise, power module 4 directly powers the PIR probe. Here, m is 15 ms. First branch Q1 includes a first resistor R15 and a second resistor R16 connected in parallel between conductive component 3 and probe 1. The EO terminal is connected to pin 1 of the probe interface.

[0045] When the IR probe is obstructed, the signal it receives can be very weak. The control circuit of this application addresses this issue by, based on the characteristics of the IR probe, simultaneously providing power to it through branch Q1. Branch Q2, however, allows it to be directly converted into a bias circuit in this situation to provide a bias voltage, thereby facilitating the transmission of even weak signals to the control module. To ensure this bias voltage is provided, a third resistor R22 is provided in branch Q2, connected between the power module 4 and the probe 1.

[0046] In order to ensure that the control module 2 can accurately collect the signal from the IR probe, the control circuit also includes an amplification module 5, such as Figure 2 As shown, the amplification module 5 includes an amplification circuit 51, a first filter capacitor C22 and a second filter capacitor C21, one end of the first filter capacitor C22 is connected between the third resistor R22 and the probe 1 and the other end is grounded, one end of the second filter capacitor C21 is connected to the third resistor R22 and the other end is connected to the signal terminal SIG of the control module 2 through the amplification circuit 51.

[0047] As for the PIR probe connected, the PIR probe will be powered by the R22 resistor, and its output signal will be directly presented on the EO pin, and directly obtained by sampling the EO port of the control module 2.

[0048] In this way, by cleverly utilizing the basic circuit characteristics of the two probes and the basic characteristics of the conductive components, it is set up that in the identification state, the voltage sampling value can be obtained and analyzed and judged to accurately determine the probe type; and in the normal working state, the circuit can be cleverly converted into a corresponding probe to provide drive and bias voltage for signal acquisition or directly acquire the signal according to the probe characteristics, so that one circuit can realize the identification and judgment of the probe, and provide accurate drive and precise signal sampling for the probe. The circuit itself has a simple structural design, which improves the versatility and applicability of the circuit while ensuring the reduction of production costs.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A control circuit suitable for identifying and driving multiple probes and sampling signals, the control circuit comprising a probe (1), characterized in that: The control circuit further includes: A control module (2), the control module (2) comprising an output terminal (SO) and a sampling terminal (EO); A conducting component (3), the conducting component (3) being connected to the output end (SO) of the control module (2) and the probe (1) respectively, and the control module (2) switching the control circuit between an identification state and a normal working state by controlling the on and off of the conducting component (3); A power supply module (4), the power supply module (4) being connected to the conductive component (3) and the probe (1) to form a first branch (Q1) and a second branch (Q2), respectively; The sampling end (EO) of the control module (2) is connected between the conductive component (3) and the probe (1), and when the control circuit is in an identification state, the sampling end (EO) periodically collects electrical information n times and analyzes the collected electrical information to identify whether the probe is of the IR type or the PIR type.

2. The control circuit for identifying, driving, and sampling multiple probes according to claim 1, characterized in that: The control module further comprises a signal terminal (SIG) connected between the power module (4) and the probe (1) for sampling signals from the IR probe when the control circuit is in a normal working state, and the sampling terminal (EO) collects signals from the PIR probe when the control circuit is in a normal working state; The normal working state corresponds to the probe type being successfully identified and the control module (2) enabling the first branch (Q1) to drive the IR probe or the second branch (Q2) to drive the PIR probe according to the probe type.

3. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 2, characterized in that: When the control circuit is in the identification state, the conducting component (3) is turned on, and when the control circuit is in the normal working state, the conducting component (3) is turned off.

4. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 1, characterized in that: The electrical information is the voltage output by the probe (1), and the analysis includes calculating the average value of the voltage collected n times and the difference between the maximum voltage and the minimum voltage collected.

5. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 2, characterized in that: The control circuit also includes an amplification module (5) capable of amplifying information collected by the signal end (SIG).

6. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 2, characterized in that: Two parallel-connected first resistors (R15) and a second resistor (R16) are provided between the conductive component (3) and the probe (1), and the sampling end (EO) is connected between the parallel-connected resistors and the probe.

7. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 5, characterized in that: A third resistor (R22) is provided between the power module (4) and the probe (1).

8. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 7, characterized in that: The amplification module (5) comprises an amplification circuit (51), a first filter capacitor (C22) and a second filter capacitor (C21); One end of the first filter capacitor (C22) is connected between the third resistor (R22) and the probe (1) and the other end is grounded; One end of the second filter capacitor (C21) is connected to the third resistor (R22) and the other end is connected to the signal end (SIG) of the control module (2) through the amplifier circuit (51).

9. The control circuit suitable for identification, driving and signal sampling of multiple probes according to claim 2, characterized in that: The conducting component (3) is a PNP transistor, the time period corresponding to the periodicity is 15ms, and the value of n is 4.

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