Power supply control circuit of sensor

Abstract

The utility model provides a power supply control circuit of a sensor. The power supply control circuit comprises a voltage division control unit and an on-off control unit, a first end of the voltage division control unit is connected with a battery input anode through a probe of the sensor, a second end of the voltage division control unit is connected with a battery input cathode, and a third end of the voltage division control unit is connected with a first end of the on-off control unit; the second end of the on-off control unit is connected to the input positive electrode of the battery, the third end of the on-off control unit is connected to the power pin of the main chip of the sensor, the power supply condition of the main chip can be determined according to the trigger state of the sensor, and the battery is allowed to supply power to the main chip only when the sensor is in the trigger state. The power consumption of the battery is reduced, and the problems that the capacity of a power supply battery of an existing sensor is small, the standby time is generally short, although a main chip is in a low-power-consumption state for most of time, the battery is still used, the battery needs to be replaced frequently, and electric energy and manpower are wasted are solved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, specifically to a power control circuit for a sensor. Background Technology

[0002] To reduce power consumption, most existing sensors use low-power devices. The main chip in the sensor remains in a low-power state for extended periods, with the sensor signal connected to the main chip's interrupt input pin. When the sensor is triggered, the main chip's interrupt mechanism recognizes this and wakes it up to enter normal operation. It then sends the sensor status to the server for further processing, before returning to a low-power state to await the next interrupt trigger.

[0003] The inventors discovered that the sensors' power supply batteries have small capacity and generally short standby time. Although the main chip is in a low-power state most of the time, it still uses battery power and requires frequent battery replacements, which wastes energy and manpower. Utility Model Content

[0004] In response to this, this application provides a power control circuit for a sensor to solve the problems of existing sensors having small battery capacity and generally short standby time. Although the main chip is in a low-power state most of the time, it still uses battery power and requires frequent battery replacement, resulting in wasted energy and manpower.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] This application discloses a power control circuit for a sensor, including: a voltage divider control unit and an on / off control unit;

[0007] The first terminal of the voltage divider control unit is connected to the positive input terminal of the battery through the probe of the sensor, the second terminal of the voltage divider control unit is connected to the negative input terminal of the battery, and the third terminal of the voltage divider control unit is connected to the first terminal of the on / off control unit.

[0008] The second terminal of the on / off control unit is connected to the positive input terminal of the battery, and the third terminal of the on / off control unit is connected to the power pin of the main chip of the sensor.

[0009] Optionally, the power control circuit of the sensor described above further includes: a stabilization unit, wherein a first end of the stabilization unit is connected to a first end of the voltage divider control unit, and a second end of the stabilization unit is connected to a second end of the voltage divider control unit.

[0010] Optionally, in the power control circuit of the sensor described above, the anti-shake unit includes: N capacitors, where N is a positive integer;

[0011] The capacitors are connected to each other, with one end of the connection serving as the first end of the image stabilization unit and the other end serving as the second end of the image stabilization unit.

[0012] Optionally, in the power control circuit of the sensor described above, the voltage divider control unit includes: a first resistor unit and a first switching transistor;

[0013] One end of the first resistor unit is connected to the gate of the first switching transistor, and the connection point serves as the first end of the voltage divider control unit;

[0014] The other end of the first resistor unit is connected to the source of the first switching transistor, and the connection point serves as the second end of the voltage divider control unit;

[0015] The drain of the first switching transistor serves as the third terminal of the voltage divider control unit.

[0016] Optionally, in the power control circuit of the sensor described above, the first resistor unit includes: M first resistors, where M is a positive integer;

[0017] Each of the first resistors is connected to the other, with one end of the connection serving as one end of the first resistor unit and the other end serving as the other end of the first resistor unit.

[0018] Optionally, in the power control circuit of the sensor described above, the first switching transistor is an NMOS transistor.

[0019] Optionally, in the power control circuit of the sensor described above, the on / off control unit includes: a second resistor unit and a second switch transistor;

[0020] One end of the second resistor unit is connected to the gate of the second switch transistor, and the connection point serves as the first terminal of the on / off control unit;

[0021] The other end of the second resistor unit is connected to the drain of the second switching transistor, and the connection point serves as the second terminal of the on / off control unit;

[0022] The source of the second switching transistor serves as the third terminal of the on / off control unit.

[0023] Optionally, in the power control circuit of the sensor described above, the second resistor unit includes: K second resistors, where K is a positive integer;

[0024] Each of the second resistors is connected to the other, with one end of the connection serving as one end of the second resistor unit and the other end serving as the other end of the second resistor unit.

[0025] Optionally, in the power control circuit of the sensor described above, the second switching transistor is a PMOS transistor.

[0026] Optionally, in the power control circuit of the sensor described above, the sensor is a water immersion sensor.

[0027] The power control circuit for the sensor provided in this application includes: a voltage divider control unit and an on / off control unit; the first terminal of the voltage divider control unit is connected to the positive input terminal of the battery through the sensor probe, the second terminal of the voltage divider control unit is connected to the negative input terminal of the battery, and the third terminal of the voltage divider control unit is connected to the first terminal of the on / off control unit; the second terminal of the on / off control unit is connected to the positive input terminal of the battery, and the third terminal of the on / off control unit is connected to the power pin of the sensor's main chip. It can determine the power supply status of the main chip according to the trigger state of the sensor. The battery is only allowed to supply power to the main chip when the sensor is in the trigger state, which reduces the battery power consumption and solves the problem that the existing sensors have small battery capacity and generally short standby time. Although the main chip is in a low power consumption state most of the time, it still uses battery power and requires frequent battery replacement, which wastes electricity and manpower. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 A schematic diagram of the power control circuit for a sensor provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of the power control circuit for the first type of sensor provided in this application embodiment;

[0031] Figure 3 A schematic diagram of the power control circuit for the second type of sensor provided in this application embodiment;

[0032] Figure 4 A schematic diagram of the power control circuit for the third type of sensor provided in this application embodiment;

[0033] Figure 5 A schematic diagram of the power control circuit for the fourth type of sensor provided in this application embodiment;

[0034] Figure 6 A circuit diagram of a power control circuit for a sensor provided in an embodiment of this application;

[0035] Figure 7 A circuit diagram of a power control circuit for another sensor provided in an embodiment of this application. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] First, it should be noted that a sensor is a detection device that can sense the information being measured and transform the sensed information into an electrical signal or other required form of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control.

[0038] Sensors are characterized by miniaturization, intelligence, multifunctionality, systematization, and grid-based architecture, making them a primary component in achieving automatic detection and control.

[0039] The sensor requires an auxiliary power supply during operation. If the auxiliary power supply is a battery of fixed capacity, even though the main chip is in a low-power state most of the time when the sensor is in standby mode for a long time, it still uses the battery power and requires frequent battery replacement, which wastes electricity and manpower.

[0040] In response to this, this application provides a power control circuit for a sensor to solve the problems of existing sensors having small battery capacity and generally short standby time. Although the main chip is in a low-power state most of the time, it still uses battery power and requires frequent battery replacement, which wastes electricity and manpower.

[0041] Please see Figure 1 The power control circuit of the sensor mainly includes: a voltage divider control unit 101 and an on / off control unit 102; the first terminal of the voltage divider control unit 101 is connected to the sensor probe ( Figures 2 to 7 The RS in the middle is connected to the positive terminal of the battery input ( Figures 2 to 6 Vin), the second terminal of the voltage divider control unit 101 is connected to the negative input terminal of the battery ( Figures 2 to 6 The third terminal of the voltage divider control unit 101 is connected to the first terminal of the on / off control unit 102 (GND in the voltage divider control unit 101); the second terminal of the on / off control unit 102 is connected to the positive input terminal of the battery, and the third terminal of the on / off control unit 102 is connected to the power supply pin of the main chip of the sensor.

[0042] In practical applications, the sensor can be a water immersion sensor; of course, it is not limited to this, and can also be other existing sensors, such as temperature sensors, pressure sensors, gas sensors, etc.

[0043] In practical applications, the main chip of a sensor is a chip that can output corresponding signals based on the sensor's state for subsequent processing.

[0044] It should be noted that a water immersion sensor is a sensor that detects whether water leakage has occurred within the measured area. Once leakage occurs, it can issue an alarm to prevent related losses and damages caused by the leakage accident. In practice, water immersion sensors are widely used in data centers, communication equipment rooms, power plants, warehouses, archives, and any other places that require waterproofing.

[0045] It should also be noted that water immersion sensors are based on the principle of liquid conductivity. Electrodes are used to detect the presence of water, and the sensor then converts this information into a dry contact signal. Contact-type water immersion sensors utilize this principle. Under normal conditions, the probe is insulated from air; when submerged in water, the probe conducts, and the sensor outputs a dry contact signal. When water comes into contact with the sensor probe, the main chip can accurately determine the state and take appropriate action by calculating changes in the magnetic field.

[0046] In some embodiments, such as Figure 2 As shown, the voltage divider control unit 101 may include: a first resistor unit 1011 and a first switching transistor Q2.

[0047] One end of the first resistor unit 1011 is connected to the gate of the first switching transistor Q2, and the connection point serves as the first terminal of the voltage divider control unit 101; the other end of the first resistor unit 1011 is connected to the source of the first switching transistor Q2, and the connection point serves as the second terminal of the voltage divider control unit 101; the drain of the first switching transistor Q2 serves as the third terminal of the voltage divider control unit 101.

[0048] In practical applications, the first switch Q2 can be an NMOS transistor. When the gate-source voltage of the first switch Q2 is greater than its own turn-on voltage, the first switch Q2 is in the turn-on state, and the drain and source of the first switch Q2 form a conductive channel.

[0049] In some embodiments, such as Figure 3 As shown, the first resistor unit 1011 mainly includes: M first resistors R1, where M is a positive integer. Figure 3 Let's take the first resistor R1 as an example.

[0050] Each of the first resistors R1 is connected, with one end of the connection serving as one end of the first resistor unit 1011 and the other end serving as the other end of the first resistor unit 1011.

[0051] The connection between each first resistor R1 can be a series connection, a parallel connection, or a series-parallel connection, depending on the application environment, and all of these are within the protection scope of this application.

[0052] In practical applications, the first resistor R1 functions as a voltage divider. Since the sensor probe and the first resistor R1 are connected in series across the battery, the resistors can form a voltage divider. When the impedance of the sensor probe decreases to a certain level, the voltage divided by the first resistor R1 increases sufficiently to drive the first switch Q2 to conduct.

[0053] For example, taking a water immersion sensor as an example, the sensor probe's impedance decreases when it comes into contact with water.

[0054] It should be noted that the specific value of M can be determined according to the application environment. Examples include 1, 2, and 3. This application does not impose specific limitations, and all of them are within the protection scope of this application.

[0055] It should also be noted that, in order to maintain the stability of the voltage divider output, the resistance value of the first resistor R1 is generally taken as a large value, such as 1~20MΩ; of course, it is not limited to this, and can be determined according to the application environment and user needs, all of which are within the protection scope of this application.

[0056] In some embodiments, such as Figure 3 As shown, the on / off control unit 102 may include: a second resistor unit 1021 and a second switch Q1.

[0057] One end of the second resistor unit 1021 is connected to the gate of the second switch Q1, and the connection point serves as the first terminal of the on / off control unit 102; the other end of the second resistor unit 1021 is connected to the drain of the second switch Q1, and the connection point serves as the second terminal of the on / off control unit 102; the source of the second switch Q1 serves as the third terminal of the on / off control unit 102.

[0058] In practical applications, the second switch Q1 can be a PMOS transistor. When the gate-source voltage of the second switch Q1 is less than its own turn-on voltage, the second switch Q1 is in the turn-on state, and the source and drain of the first switch Q1 form a conductive channel.

[0059] It should be noted that the second switching transistor Q1 can be a PMOS transistor with a parasitic diode, which can prevent the source and drain of the switching transistor from burning out when they are reversed. It can also provide a path for the reverse induced voltage when there is a reverse interference voltage in the circuit, thus preventing the reverse induced voltage from breaking down the MOS transistor.

[0060] In some embodiments, such as Figure 4 As shown, the second resistor unit 1021 mainly includes: K second resistors R2, where K is a positive integer. Figure 5 Let's take the second resistor R2 as an example.

[0061] Each of the second resistors R2 is connected, with one end of the connection serving as one end of the second resistor unit 1021 and the other end serving as the other end of the second resistor unit 1021.

[0062] The connection between each second resistor R2 can be a series connection, a parallel connection, or a series-parallel connection, depending on the application environment, and all of these are within the protection scope of this application.

[0063] In practical applications, the function of the second resistor R2 is to pull up the gate voltage of the second switch Q1, since the second switch Q1 is triggered by a low voltage. The second resistor R2 can pull up the gate voltage of the second switch Q1 to ensure that the second switch Q1 is in the off state when the sensor probe is not triggered.

[0064] For example, taking a water immersion sensor as an example, when the probe of the water immersion sensor is not immersed in water, the second resistor R2 can pull up the gate voltage of the second switch Q1, ensuring that the second switch Q1 is in the off state when the probe of the water immersion sensor is not triggered.

[0065] It should be noted that the specific value of K can be determined according to the application environment. For example, 1, 2, and 3 are provided. This application does not impose any specific limitations on these values, and all of them are within the scope of protection of this application.

[0066] It should also be noted that the resistance value of the second resistor R2 is generally a small value, such as 2KΩ; of course, it is not limited to this, and can be determined according to the application environment and user needs, all of which are within the protection scope of this application.

[0067] In some embodiments, such as Figure 5 As shown, the power control circuit of the sensor may further include: a stabilization unit 103, the first end of which is connected to the first end of the voltage divider control unit 101, and the second end of which is connected to the second end of the voltage divider control unit 101.

[0068] In practical applications, such as Figure 6 As shown, the image stabilization unit 103 may include: N capacitors C1, where N is a positive integer. Figure 6 Taking capacitor C1 as an example;

[0069] The capacitors C1 are connected together, with one end serving as the first end of the image stabilization unit 103 and the other end serving as the second end of the image stabilization unit 103.

[0070] The connection between the capacitors C1 can be in series, in parallel, or a combination of series and parallel, depending on the application environment, and all are within the scope of protection of this application.

[0071] It should be noted that capacitor C1 can de-jitter the voltage division of the first resistor R1, thereby ensuring the stability of the output voltage of the first switching transistor Q2.

[0072] Combination Figure 7The power control circuit for the sensor shown, taking a water immersion sensor as an example, assumes that the battery input positive voltage is 3.3V and the battery output is also 3.3V. The specific implementation principle of this circuit is as follows:

[0073] When the probe of the water immersion sensor is not triggered, that is, the probe does not encounter water and its impedance does not change, the impedance of the probe is relatively large. The voltage divider of the first resistor R1 is input to the gate of the first switch Q2. The gate voltage of the first switch Q2 is less than the conduction voltage, so the first switch Q2 does not conduct. The gate voltage of the second switch Q1 remains high, so the second switch Q1 does not conduct. The source of the second switch Q1 does not output current to the power supply pin of the sensor's main chip.

[0074] When the probe of the water immersion sensor is triggered, that is, when the probe encounters water, its impedance changes. At this time, the impedance of the probe is relatively small. The voltage divider of the first resistor R1 is input to the gate of the first switch Q2. The gate voltage of the first switch Q2 is greater than the conduction voltage, so the first switch Q2 is turned on. The gate voltage of the second switch Q1 is pulled low, so the second switch Q1 is turned on. The source output current of the second switch Q1 is sent to the power supply pin of the sensor's main chip.

[0075] It should be noted that the equivalent resistance of the probe of the water immersion sensor is generally 200~300KΩ; the capacitance of capacitor C1 can be set to 104F.

[0076] Based on the above, the power control circuit for the sensor provided in this embodiment includes: a voltage divider control unit 101 and an on / off control unit 102; the first terminal of the voltage divider control unit 101 is connected to the positive input terminal of the battery through the sensor probe, the second terminal of the voltage divider control unit 101 is connected to the negative input terminal of the battery, and the third terminal of the voltage divider control unit 101 is connected to the first terminal of the on / off control unit 102; the second terminal of the on / off control unit 102 is connected to the positive input terminal of the battery, and the third terminal of the on / off control unit 102 is connected to the power pin of the main chip of the sensor. It can determine the power supply status of the main chip according to the trigger state of the sensor. The battery is only allowed to supply power to the main chip when the sensor is in the trigger state, which reduces the loss of battery power and solves the problem that the existing sensors have small battery capacity and generally short standby time. Although the main chip is in a low power consumption state most of the time, it still uses battery power and requires frequent battery replacement, which wastes electricity and manpower.

[0077] It is understandable that the design concept of this application is that when the sensor is not triggered, it does not need to supply power to the main chip, and its power supply is cut off; when the sensor is triggered, the main chip's working power is automatically turned on based on the change in the sensor's own resistance, so that the main chip enters the working state and transmits the signal to the lower-level server for processing. In this way, the sensor chip can be started to work when an abnormal state is detected, while in normal state, the chip is completely powered off and does not consume power, thus achieving the purpose of energy saving.

[0078] The features described in the various embodiments of this specification can be substituted for or combined with each other. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0079] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0080] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0081] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A power control circuit for a sensor, characterized in that, include: Voltage divider control unit and on / off control unit; The first terminal of the voltage divider control unit is connected to the positive input terminal of the battery through the probe of the sensor, the second terminal of the voltage divider control unit is connected to the negative input terminal of the battery, and the third terminal of the voltage divider control unit is connected to the first terminal of the on / off control unit. The second terminal of the on / off control unit is connected to the positive input terminal of the battery, and the third terminal of the on / off control unit is connected to the power pin of the main chip of the sensor.

2. The power control circuit for the sensor according to claim 1, characterized in that, Also includes: A stabilization unit, wherein a first end of the stabilization unit is connected to a first end of the voltage divider control unit, and a second end of the stabilization unit is connected to a second end of the voltage divider control unit.

3. The power control circuit for the sensor according to claim 2, characterized in that, The image stabilization unit includes: N capacitors, where N is a positive integer; The capacitors are connected to each other, with one end of the connection serving as the first end of the image stabilization unit and the other end serving as the second end of the image stabilization unit.

4. The power control circuit for the sensor according to claim 1, characterized in that, The voltage divider control unit includes: a first resistor unit and a first switching transistor; One end of the first resistor unit is connected to the gate of the first switch transistor, and the connection point serves as the first end of the voltage divider control unit; The other end of the first resistor unit is connected to the source of the first switching transistor, and the connection point serves as the second end of the voltage divider control unit; The drain of the first switching transistor serves as the third terminal of the voltage divider control unit.

5. The power control circuit for the sensor according to claim 4, characterized in that, The first resistor unit includes: M first resistors, where M is a positive integer; Each of the first resistors is connected to the other, with one end of the connection serving as one end of the first resistor unit and the other end serving as the other end of the first resistor unit.

6. The power control circuit for the sensor according to claim 4, characterized in that, The first switching transistor is an NMOS transistor.

7. The power control circuit for the sensor according to claim 1, characterized in that, The on / off control unit includes: a second resistor unit and a second switch transistor; One end of the second resistor unit is connected to the gate of the second switch transistor, and the connection point serves as the first terminal of the on / off control unit; The other end of the second resistor unit is connected to the drain of the second switching transistor, and the connection point serves as the second terminal of the on / off control unit; The source of the second switching transistor serves as the third terminal of the on / off control unit.

8. The power control circuit for the sensor according to claim 7, characterized in that, The second resistor unit includes: K second resistors, where K is a positive integer; Each of the second resistors is connected to the other, with one end of the connection serving as one end of the second resistor unit and the other end serving as the other end of the second resistor unit.

9. The power control circuit for the sensor according to claim 7, characterized in that, The second switch is a PMOS transistor.

10. The power control circuit for the sensor according to any one of claims 1-9, characterized in that, The sensor is a water immersion sensor.

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