CN216437053U

CN216437053U - Control circuit suitable for multi-probe identification and driving and signal sampling

Info

Publication number: CN216437053U
Application number: CN202122280825.1U
Authority: CN
Inventors: 马旭红; 章闻天; 吴其志
Original assignee: Ningbo Technic Lighting Co ltd
Current assignee: Ningbo Technic Lighting Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-05-03
Anticipated expiration: 2031-09-18

Abstract

The utility model relates to a control circuit suitable for the discernment and the drive of many probes and signal sampling, control circuit includes the probe, still includes control module, control module includes output and sampling end; the conduction component is respectively connected with the output end of the control module and the probe, and the control module switches the control circuit between an identification state and a normal working state by controlling the on-off state of the conduction component; the power supply module is respectively connected with the conduction component and the probe to form a first branch circuit and a second branch circuit respectively; the sampling end of the control module is connected between the conducting component and the probe, and when the control circuit is in the identification state, the electric information is periodically collected for n times and the collected electric information is analyzed to identify that the probe is of an IR type or a PIR type. The circuit is simple in structure, production cost is reduced, and judgment and working accuracy is high.

Description

Control circuit suitable for multi-probe identification and driving and signal sampling

Technical Field

The utility model relates to a probe technical field especially relates to a control circuit who is applicable to discernment and drive and signal sampling of many probes.

Background

The probes are widely applied to occasions such as cabinets and the like, the types of the probes are various, the current mainstream types are IP probes and PIR probes, different probes need to correspond to different probe controllers to play corresponding functions, namely the IP probes need to be matched with the IP controllers to play the functions of non-contact hand-swing switches, dimming, door switches and the like, and the PIR probes need to be matched with the PIR controllers to be used for detecting the existence of a human body, so that the time delay control is realized.

This kind of one-to-one matching requirement causes if will realize different functions in the system, must prepare multiple sets of multiple type probe and controller in advance, both brought the trouble of assembly and disassembly, causes more that current can only provide the control circuit of drive and signal sampling for corresponding the probe, because of the change of controller redesign, leads to the production manufacturing cost increase suddenly, and very inconvenient.

To overcome this problem, some manufacturers have built in control modules in the probe, which allow the controller to communicate with the control modules in the probe via data patterns to identify the probe and the probe signals. The mode can effectively solve the problem that one controller can only be suitable for one probe, so that multiple probes are controlled by one controller, and the realization of the multifunction of the product becomes possible.

But this mode has increased the structural complexity of probe for the volume and the size grow of probe, and in systems such as cupboard, the most embedded plank side of installing at thickness about 18mm of probe, can't satisfy current application demand certainly after the spy after the change, only must improve on original volume and size basis, and this has become the design of relative probe again and has proposed higher requirement, makes manufacturing cost artificially increase again.

SUMMERY OF THE UTILITY MODEL

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

In order to realize the purpose, the technical scheme of the utility model is that: a control circuit adapted for multi-probe identification and drive and signal sampling, the control circuit comprising a probe, characterized in that: the control circuit further comprises a control circuit for controlling the switching of the switching device,

the control module comprises an output end and a sampling end;

the conduction component is respectively connected with the output end of the control module and the probe, and the control module switches the control circuit between an identification state and a normal working state by controlling the on-off state of the conduction component;

the power supply module is respectively connected with the conduction component and the probe to form a first branch circuit and a second branch circuit respectively;

the sampling end of the control module is connected between the conducting component and the probe, and when the control circuit is in the identification state, the electric information is periodically collected for n times and the collected electric information is analyzed to identify that the probe is of an IR type or a PIR type.

Furthermore, the control module also comprises a signal end which is connected between the power supply module and the probe and is used for sampling signals of the IR probe when the control circuit is in a normal working state, and the sampling end is used for collecting signals of the PIR probe when the control circuit is in the normal working state;

and the normal working state corresponds to the condition that the type of the probe is successfully identified, and the control module enables the first branch circuit to provide drive for the IR probe or the second branch circuit to provide drive for the PIR probe according to the type of the probe.

Furthermore, the control circuit is in the identification state and corresponds to the conduction component being turned on, and the control circuit is in the normal working state and corresponds to the conduction component being turned off.

Further, the electrical information is the voltage output by the probe, and the analyzing comprises calculating an average value of the acquired n times of voltages and a difference value between the acquired maximum voltage and the acquired minimum voltage.

Furthermore, the control circuit further comprises an amplifying module capable of amplifying the information collected by the signal end.

Furthermore, a first resistor and a second resistor which are connected in parallel are arranged between the conducting component and the probe.

Furthermore, a third resistor is arranged between the power module and the probe.

Further, the amplifying module comprises an amplifying circuit, a first filter capacitor and a second filter capacitor;

one end of the first filter capacitor is connected between the third resistor and the probe, and the other end of the first filter capacitor is grounded;

one end of the second filter is connected with the third resistor, and the other end of the second filter is connected with the control module through the amplifying circuit.

Further, the conducting component is a PNP type triode, the period of time corresponding to the periodicity is 15ms, and the value of n is 4.

Compared with the prior art, the utility model has the advantages of:

the control circuit is designed according to the basic circuit characteristics of the probe, the average value of the acquired voltage and the difference value between the maximum voltage and the minimum voltage are analyzed by combining the respective output voltage characteristics of the IR probe and the PIR probe, the type of the probe can be accurately judged, different driving modes and signal sampling are selected by controlling the connection and disconnection of the connection part according to the type of the probe, the same control circuit is suitable for different probes, driving and signal acquisition are provided for different probes, the circuit applicability is improved, the circuit is simple and ingenious in design, and the production cost is greatly reduced.

Drawings

Fig. 1 is a block diagram of a control circuit suitable for identification and driving of multiple probes and signal sampling according to the present application.

Fig. 2 is a schematic diagram of a preferred circuit of the control circuit for the identification and driving of multiple probes and signal sampling according to the present application.

Fig. 3 is a schematic diagram of an internal circuit of an IP probe commonly used in the industry.

Figure 4 is a schematic diagram of the internal circuitry of a PIR probe commonly used in the art.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Fig. 1 shows a block diagram of a control circuit applicable to identification and driving of multiple probes and signal sampling in the present application, and fig. 2 is a corresponding preferred embodiment of the control circuit. As shown in fig. 1, the control circuit includes a probe 1, a control module 2, a conducting component 3 and a power module 4, the control module 2 includes an output terminal SO and a sampling terminal EO, the conducting component 3 is connected to the output terminal SO of the control module 2 and the probe 1 respectively, the control module 2 controls the on/off of the conducting component 3 by outputting a high/low level through the output terminal SO to switch the control circuit between a recognition state and a normal operation state, the power module 4 is connected to the conducting component 3 and the probe 1 respectively to form a first branch Q1 and a second branch Q2 respectively, and the sampling terminal EO of the control module 2 is connected between the conducting component 3 and the probe 1 and can periodically collect electrical information n times when the control circuit is in the recognition state, and analyze the collected electrical information to recognize the probe as an IR or PIR type.

As mentioned in the background art, the current circuit cannot identify and match multiple probes, only one probe corresponds to one controller, which greatly increases the production cost, and the mode of embedding a control module in the probe seems to reduce the cost, but actually, the applicability of the probe is influenced due to the increase of the volume and the size of the probe, which is not preferable.

As shown in fig. 3, the pin 1 of the IR probe interface is connected to the ground by an infrared emitting diode, which outputs a stable voltage after the infrared emitting diode is turned on; the PIR1 in the PIR probe is a digital probe, when no human body signal is detected, the low level can be continuously output, the output of the PIR probe is lower than the pull current capability, when the PIR probe outputting the low level is connected with a high level circuit, the high level can be pulled down and reduced, and therefore the difference between the highest voltage and the lowest voltage of the output is larger.

To facilitate the sampling analysis, in this application, the electrical information is the voltage collected at the sampling end, and the analysis includes calculating the average value of the collected n times of voltages and the difference value between the collected maximum voltage and minimum voltage. Therefore, the voltage signal is collected and analyzed by utilizing the basic circuit characteristics of the probe, so that the type of the probe is accurately judged and identified without redesigning a circuit and replacing a controller, and the production cost is reduced.

Preferably, the control circuit of the present application is in the identification state corresponding to the conducting part being turned on, and in the normal operation state corresponding to the conducting part being turned off. As shown in fig. 2, the conducting part preferably employs a PNP transistor Q4 in this embodiment.

As mentioned above, the probe 1 comprises an IP probe and a PIR probe, and the control module 2 of the control circuit drives the probe by the first branch or the second branch according to the type of the probe, specifically, when the probe is an IP probe, the control module 2 controls the conducting component 3 to supply power to the probe by the first branch Q1, and when the probe is a PIR probe, the probe is directly supplied by the second branch Q2, and the driving branches are differentiated based on the basic circuit characteristics of the two probes.

When the control circuit is in the identification state, the control module 2 is started to output a low level to the SO pin, and during the period that the SO pin is at the low level, the Q4 is conducted, and the voltage of the power supply module 4 is loaded to the pin of the interface 1 of the probe 1. After the SO pin is pulled down, the voltage of the EO pin is started to be detected, sampling is carried out again after each time delay (specifically, 15ms is selected here), and the high level is output to the SO pin after n times of continuous sampling (where n takes the value of 4) are carried out.

Obviously, the purpose of turning on Q4 here is more, according to the probe characteristics, to be able to supply power from the first branch Q1 as a power source for subsequent voltage sampling when an IP probe is connected. If the PIR probe is connected, the power is directly supplied by the second branch Q2 according to the characteristics of the PIR probe, namely, the power supply pin of the PIR probe is connected with the power supply module 4 through the pin 3 of the probe interface, and the output pin of the PIR probe is connected with the pin 1 of the probe interface. In the present application, the voltage of the power supply module VCC is 3.3V, because the operating voltage of the PIR probe is generally less than 3.6V.

The reason why the triode is adopted is that the output of the PIR probe has two conditions of high level and low level, and when the output of the PIR probe is low level, the condition can quickly distinguish whether the IR probe or the PIR probe is installed according to the average value and the difference value of the voltage. The difficulty is that if the PIR probe outputs high level, 4 groups of voltages measured by the sampling end of the control module are all larger than 3V, which is the same as the case of no probe connection, and at this time, whether the PIR probe is connected or not can not be distinguished. Since the triode is adopted, the situation can be well distinguished by utilizing the basic characteristics of the triode, and the details are analyzed below.

The IR probe has an IR emitting diode which is normally turned on when the control circuit is in an identification state, the voltage of the diode is in a range of 1.0-1.2V (related to the driving current, but the fixed current is basically kept constant), and if the average value of the voltages sampled for 4 times is basically in the range and the difference value between the maximum voltage and the minimum voltage is less than 0.1V, the IR probe can be determined.

With reference to fig. 4, if the voltage collected by the sampling end linearly decreases from 3.3v, the average value of 4 groups of data is small, and especially the difference between the maximum voltage and the minimum voltage is large, it can be determined that the currently connected probe is the PIR probe, and the output of the probe at this time is the low level.

If the measured 4 groups of voltage values are all larger than 3V, because the setting is already set, the SO pin is output with high level after 4 continuous sampling, in order to distinguish whether the PIR probe is connected or not connected at the moment, after Q4 is turned off, sampling is continued for once every period of time (15 ms is still selected here), and voltage data are collected for 4 times totally, if the high level is caused by that the RAL pin outputs high level due to that the PIR probe senses a human body signal, the 4 groups of data collected for the second time are still larger than 3V, if the high level is caused by that the probe is not connected, in the process of sampling for 4 times at intervals, the data sampled at each time are smaller than the previous time due to C-level charge discharge of Q4, SO that the calculated average voltage value is smaller than 3V, and the difference between the maximum voltage and the minimum voltage value is larger than 1V, SO that the PIR probe is connected at the moment can be easily distinguished by the mode, only the PIR probe senses a human body signal and outputs a high level at the moment, and the PIR probe is not connected with the probe, so that accurate judgment and identification are realized.

It should be noted that the transistor may be replaced by other turn-off devices, such as MOS transistors, as long as the similar function and effect as the transistor can be achieved.

After the probe type is identified, the control circuit is switched to a normal working state, namely Q4 is turned off. In order to timely and accurately acquire probe information, the control module 2 further comprises a signal end SIG connected between the power module 4 and the probe 1 so as to sample signals of the IR probe when the control circuit is in a normal working state, and the signal end SIG corresponds to the PIR probe, so that the signal sampling is directly performed on the PIR probe by the sampling end EO.

Meanwhile, according to the disclosure of the IP probe, the control module 2 is turned on every m seconds to turn on the first branch Q1 to supply power to the IR probe and make the IR probe work normally, otherwise, the power module 4 directly supplies power to the PIR probe. Here, m takes 15ms, the first branch Q1 is provided with a first resistor R15 and a second resistor R16 which are connected between the conducting part 3 and the probe 1 and are connected in parallel, and the EO terminal is connected to pin 1 of the probe interface.

The control circuit of the present application solves the problem that the signal received by the IR probe will be weak when it is blocked, i.e. depending on the characteristics of the IR probe, while it is powered by the Q1 branch, due to the presence of the Q2 branch, it can be directly converted into a bias circuit in this case to provide a bias voltage, so that the weak signal can also be transmitted to the control module. Obviously, in order to ensure the supply of the bias voltage, a third resistor R22 connected between the power supply module 4 and the probe 1 is provided in the second branch Q2.

In order to ensure that the control module 2 can accurately acquire signals from the IR probe, the control circuit further includes an amplifying module 5, as shown in fig. 2, the amplifying module 5 includes an amplifying 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 amplifying circuit 51.

If the PIR probe is connected, the PIR probe is powered through the R22 resistor, and an output signal of the PIR probe is directly presented on an EO pin and is directly obtained after sampling by an EO port of the control module 2.

Therefore, the probe type can be accurately judged by acquiring a voltage sampling value and analyzing and judging the voltage sampling value in the identification state by skillfully utilizing the basic circuit characteristics of the two probes and the basic characteristics of the conducting component; and when normal operating condition, again can be based on probe characteristic with this circuit ingenious conversion become correspond the probe and provide drive and bias voltage to supply signal acquisition or directly gather the signal, make a circuit realize promptly to the discernment of probe and judge, realized again providing accurate drive and accurate signal sampling to the probe, and circuit structural design itself is simple, when having improved the multifunctionality and the suitability of circuit, has guaranteed manufacturing cost's reduction.

While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control circuit suitable for identification and actuation and signal sampling of multiple probes, said control circuit comprising a probe (1), characterized in that: the control circuit further comprises a control circuit for controlling the switching of the switching device,

a control module (2), the control module (2) comprising an output (SO) and a sampling End (EO);

the conduction component (3), the conduction component (3) is respectively connected with the output end (SO) of the control module (2) and the probe (1), and the control module (2) switches the control circuit between the recognition state and the normal working state by controlling the on-off of the conduction component (3);

a power supply module (4), the power supply module (4) being connected to the conducting part (3) and the probe (1) respectively 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 conducting part (3) and the probe (1), and when the control circuit is in the identification state, the electric information is periodically collected for n times and the collected electric information is analyzed to identify the probe as an IR type or a PIR type.

2. The control circuit for identification and drive and signal sampling of multiple probes according to claim 1, wherein:

the control module further comprises a signal end (SIG) which is connected between the power supply module (4) and the probe (1) and is used for sampling signals of the IR probe when the control circuit is in a normal working state, and the sampling End (EO) is used for collecting signals of the PIR probe when the control circuit is in the normal working state;

the normal operating state corresponds to the probe type being successfully identified and the control module (2) causes the first branch (Q1) to provide drive for the IR probe or the second branch (Q2) to provide drive for the PIR probe according to the probe type.

3. The control circuit for identification and drive and signal sampling of multiple probes according to claim 2, wherein:

the control circuit is in the identification state and corresponds to the conduction part (3) to be conducted, and the control circuit is in the normal working state and corresponds to the conduction part (3) to be turned off.

4. The control circuit for identification and drive and signal sampling of multiple probes according to claim 1, wherein:

the electrical information is the voltage output by the probe (1), and the analysis comprises calculating the average value of the acquired n times of voltage and the difference value between the acquired maximum voltage and the acquired minimum voltage.

5. The control circuit for identification and drive and signal sampling of multiple probes according to claim 2, wherein:

the control circuit also comprises an amplification module (5) which can amplify the information collected by the signal terminal (SIG).

6. The control circuit for identification and drive and signal sampling of multiple probes according to claim 2, wherein:

two parallel first resistors (R15) and second resistors (R16) are arranged between the conducting component (3) and the probe (1), and the sampling End (EO) is connected between the parallel resistors and the probe.

7. The control circuit for identification and drive and signal sampling of multiple probes according to claim 5, wherein:

and a third resistor (R22) is arranged between the power supply module (4) and the probe (1).

8. The control circuit for identification and drive and signal sampling of multiple probes according to claim 7, wherein:

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 with the third resistor (R22) and the other end is connected with a signal end (SIG) of the control module (2) through an amplifying circuit (51).

9. The control circuit for identification and drive and signal sampling of multiple probes according to claim 2, wherein:

the conducting component (3) is a PNP type triode, the time period corresponding to the periodicity is 15ms, and the value of n is 4.