Detection circuit and autonomous operation equipment

Abstract

The utility model discloses a detection circuit and autonomous operation equipment. The detection circuit comprises at least one detection module and a control module, the detection module is arranged in a load to be detected, and the detection module is connected with the control module; the detection module comprises a temperature detection unit, the temperature detection unit is connected between a power supply and the control module and is used for generating a first signal, and the control module is used for determining temperature information of the load to be detected according to the first signal; and the rotating speed detection unit is connected between a power supply and the temperature detection unit and is used for generating a second signal according to the standby state and the working state of the load to be detected, and the control module is used for determining the rotating speed information of the load to be detected according to the frequency of the second signal. According to the technical scheme provided by the embodiment of the utility model, the detection circuit is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection circuit technical field especially relates to a detection circuit and autonomous operation equipment. BACKGROUND

[0002] Autonomous operation equipment with load prevents the load from burning out due to overheat of working temperature when working, needs to monitor whether the speed and temperature of the load are in normal range in real time, and the detection circuit structure adopted in the prior art is complex, and the compactness and detection efficiency of the circuit are poor. UTILITY MODEL CONTENTS

[0003] The utility model provides a detection circuit and autonomous operation equipment to solve the problem that detection circuit is more complex.

[0004] According to an aspect of the utility model, a detection circuit is provided, which comprises: at least one detection module and a control module; the detection module is arranged in the interior of a load to be measured, and the detection module is connected with the control module; the detection module comprises:

[0005] A temperature detection unit is connected between a power supply and the control module, used for generating a first signal, and the control module is used for determining temperature information of the load to be measured according to the first signal;

[0006] A speed detection unit is connected between the power supply and the temperature detection unit, used for generating a second signal according to the standby state and working state of the load to be measured, and the control module is used for determining speed information of the load to be measured according to the frequency of the second signal.

[0007] Optionally, the speed detection unit and the temperature detection unit are multiplexed;

[0008] The speed detection unit generates the second signal through the temperature detection unit.

[0009] Optionally, the temperature detection unit comprises:

[0010] A thermistor is connected between the speed detection unit and the control module, and the thermistor is used for adjusting resistance value according to the temperature in the interior of the load to be measured;

[0011] A voltage dividing resistor is connected between the power supply and the control module, and the voltage dividing resistor is used for voltage division of the thermistor.

[0012] Optionally, the speed detection unit comprises:

[0013] A Hall sensor, wherein the first end of the Hall sensor is connected to a power supply, the second end of the Hall sensor is grounded, and the third end of the Hall sensor is connected to the temperature detection unit, and the Hall sensor is used to generate the second signal.

[0014] Optionally, the detection module further includes:

[0015] A current-limiting resistor is connected between the temperature detection unit and the control module, and the current-limiting resistor is used to reduce the current input to the control module.

[0016] Optionally, the detection module further includes:

[0017] A transient voltage suppressor is connected between the temperature detection unit and the ground terminal, and the transient voltage suppressor is used to limit the voltage in the detection circuit.

[0018] Optionally, the detection module further includes:

[0019] A filter capacitor is connected between the control module and the ground terminal to filter the voltage input to the control module.

[0020] Optionally, the detection module further includes: a voltage regulator unit connected between the power supply and the ground terminal for regulating the power supply voltage;

[0021] The voltage regulator unit includes a first capacitor and a second capacitor, the first terminals of the first capacitor and the second capacitor are both connected to a power supply, and the second terminals of the first capacitor and the second capacitor are both connected to a ground terminal.

[0022] Optionally, the detection module further includes a connector for connecting the thermistor and the voltage divider resistor.

[0023] According to another aspect of the present invention, an autonomous operating device is provided, comprising: a load to be tested and a detection circuit provided in any embodiment of the present invention.

[0024] The technical solution provided by this embodiment simplifies the connection method of the detection circuit by connecting the temperature detection unit between the power supply and the control module. This allows the control module to simultaneously detect the speed and temperature of the load under test through a single interface, resulting in high detection efficiency. The circuit structure provided by this embodiment is simple, reduces the number of electronic components, has fewer potential failure points, and offers high circuit compactness.

[0025] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a detection circuit according to an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of another detection circuit provided according to an embodiment of the present utility model;

[0029] Figure 3 This is a schematic diagram of another detection circuit provided according to an embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of a voltage regulator unit provided according to an embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of another detection circuit provided according to an embodiment of the present utility model. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] This utility model embodiment provides a detection circuit. Figure 1 This is a schematic diagram of a detection circuit provided in an embodiment of the present invention. (Reference) Figure 1 The detection circuit includes at least one detection module 1 and a control module 2. The detection module 1 is located inside the load under test and is connected to the control module 2. The detection module 1 includes a temperature detection unit 12 and a speed detection unit 11. The temperature detection unit 12 is connected between the power supply and the control module 2 and is used to generate a first signal. The control module 2 is used to determine the temperature information of the load under test based on the first signal. The speed detection unit 11 is connected between the power supply and the temperature detection unit 12 and is used to generate a second signal based on the standby and operating states of the load under test. The control module 2 is used to determine the speed information of the load under test based on the frequency of the second signal.

[0035] The detection module 1 detects the temperature and rotational speed of the load under test. A first signal is generated based on the temperature of the load under test via a temperature detection unit 12, and the temperature information of the load under test is determined by a control module 2. The detection module 1 also generates a second signal based on the rotational speed of the load under test via a rotational speed detection unit 11, and the rotational speed information of the load under test is determined by the control module 2. For example, the first signal can be a voltage divider signal, and the second signal can be a square wave signal. The detection module 1 can be located inside the load under test and installed at a location where the load generates significant heat. The load under test can include devices such as motors, turbines, and electric motors.

[0036] For example, when the load under test is a motor, the speed detection unit 11 and the temperature detection unit 12 can be set close to the stator winding of the motor.

[0037] The rotor shaft of the load under test has a magnetic mark, which can be a small magnet. When the rotor shaft rotates, the speed detection unit 11 can detect the rotation of the magnetic mark. Therefore, the rotation of the magnetic mark can be used to reflect the rotation of the load under test.

[0038] The speed detection unit 11 has two states. When the speed detection unit 11 is in standby mode, it indicates that the speed detection unit 11 has not detected the magnetic mark on the rotor shaft of the load under test. At this time, the speed detection unit 11 can output the power supply voltage to the temperature detection unit 12 and receive it through the control module 2. For example, when the power supply voltage is 5V, the control module 2 can detect a voltage of 5V.

[0039] When the speed detection unit 11 is in operation, it indicates that the speed detection unit 11 has detected the magnetic mark on the rotor shaft of the load under test. At this time, the temperature detection unit 12 can divide the power supply voltage and generate a first signal. For example, the temperature detection unit 12 may include a thermistor, which can be used to adjust the resistance according to the temperature change, thereby generating different voltage values. The control module 2 can detect the divided voltage, which is less than the power supply voltage. By detecting this voltage and according to the correspondence between the resistance value and the temperature, the temperature information of the load under test can be generated.

[0040] As the load under test rotates continuously, the magnetic mark on the rotor shaft of the load under test will continuously pass through the speed detection unit 11, allowing the control module 2 to detect the continuous change between the power supply voltage and a voltage divider voltage lower than the power supply voltage, i.e., the high and low level second signal. By detecting the switching frequency of the high and low levels of the second signal, the control module 2 can calculate the speed of the load under test.

[0041] The technical solution provided by this embodiment simplifies the connection method of the detection circuit by connecting the temperature detection unit between the power supply and the control module. This allows the control module to simultaneously detect the speed and temperature of the load under test through a single interface, resulting in high detection efficiency. The circuit structure provided by this embodiment is simple, reduces the number of electronic components, has fewer potential failure points, and offers high circuit compactness.

[0042] Continue to refer to Figure 1 Based on the above embodiments, optionally, the speed detection unit 11 and the temperature detection unit 12 are multiplexed. The speed detection unit 11 generates a second signal through the temperature detection unit 12.

[0043] When the speed detection unit 11 does not detect the rotation of the load under test, the speed detection unit 11 is powered on, and the power supply voltage is input to the control module 2 through the temperature detection unit 12. The control module 2 can detect a voltage signal equal to the power supply voltage.

[0044] When the speed detection unit 11 detects that the load under test is rotating, the speed detection unit 11 disconnects the power supply voltage, and the power supply voltage in the temperature detection unit 12 is input into the speed detection unit 11. The temperature detection unit 12 can generate a first signal by dividing the power supply voltage. At this time, the control module 2 can detect a voltage signal that is lower than the power supply voltage.

[0045] As the load under test rotates continuously, for example, when the magnetic mark on the rotor shaft of the load under test does not pass through the speed detection unit 11, the speed detection unit 11 outputs a power supply voltage; when the magnetic mark on the rotor shaft of the load under test passes through the speed detection unit 11, the temperature detection unit 12 generates a first signal, which is a voltage divider voltage lower than the power supply voltage. At this time, the control module 2 can detect the continuous alternation between the power supply voltage and the voltage divider voltage lower than the power supply voltage, that is, the control module 2 can detect a second signal with high and low levels. By detecting the switching frequency between the high and low levels of the second signal, the control module 2 can calculate the speed of the load under test.

[0046] The speed detection unit provided in this embodiment reuses the temperature detection unit, reducing the number of electronic components. This allows the control module to simultaneously receive the output signals from both the speed detection unit and the temperature detection unit via only one signal line. The circuit structure is simple, and the detection effect is good.

[0047] Figure 2 A schematic diagram of another detection circuit provided in an embodiment of this utility model. (Reference) Figure 2 Based on the above embodiments, optionally, the temperature detection unit 12 includes a thermistor RN and a voltage divider resistor RF. The thermistor RN is connected between the speed detection unit 11 and the control module 2, and is used to adjust its resistance value according to the internal temperature of the load under test. The voltage divider resistor RF is connected between the power supply and the control module 2, and is used to divide the voltage of the thermistor RN.

[0048] Among them, the thermistor RN can produce a significant change in resistance value in response to a small temperature change and respond to the temperature change in a short time. The voltage divider resistor RF and the thermistor RN can be used to divide the power supply voltage, and the voltage values ​​of the voltage divider resistor RF and the thermistor RN will also change with the temperature.

[0049] The voltage divider resistor RF can be a pull-up resistor, and together with the thermistor RN, they form a voltage divider circuit. When the power supply supplies power to the voltage divider resistor RF and the thermistor RN, they can jointly divide the power supply voltage output by the power supply. The power supply voltage can be 5V. For example, the thermistor RN can be an NTC (Negative Temperature Coefficient) thermistor or a PTC (Positive Temperature Coefficient) thermistor. The resistance of an NTC thermistor decreases with increasing temperature, exhibiting a negative temperature coefficient characteristic. The resistance of a PTC thermistor increases with increasing temperature, exhibiting a positive temperature coefficient characteristic.

[0050] This embodiment of the invention can use an NTC thermistor, which has a wider temperature measurement range. As the temperature increases, the resistance of the NTC thermistor decreases, resulting in a smaller voltage drop across the power supply and a larger voltage drop across the power supply via the voltage divider resistor RF. The control module 2 can then generate the temperature value of the load under test based on the voltage drop across the power supply via the NTC thermistor.

[0051] Preferably, the temperature detection unit 12 may further include: a thermocouple, a resistance temperature detector, etc.

[0052] Continue to refer to Figure 2 Based on the above embodiments, optionally, the speed detection unit 11 includes: a Hall sensor 111, the first end of the Hall sensor 111 is connected to the power supply, the second end of the Hall sensor 111 is grounded, the third end of the Hall sensor 111 is connected to the temperature detection unit 12, and the Hall sensor 11 is used to generate a second signal.

[0053] Among them, the Hall sensor 111 is a magnetic sensor based on the Hall effect, which can quickly respond to changes in magnetic field and will not interfere with the motion state and magnetic field distribution of the load under test. It is suitable for measuring various harsh environments and high-speed moving objects.

[0054] For example, the Hall sensor 111 can be positioned close to the stator winding of the load under test. When the magnetic mark on the rotor shaft of the load under test does not pass over the Hall sensor 111, the Hall sensor 111 is in a floating state, and its first and third terminals are shorted. At this time, the power supply voltage can be input to the temperature detection unit 12 through the Hall sensor 111.

[0055] When the magnetic marker passes the Hall sensor 111, the Hall sensor 111 detects the rotation and shorts its second and third terminals. At this time, the Hall sensor 111 disconnects the power supply to its first terminal. A circuit can be formed between the voltage divider resistor RF, the thermistor RN, the third terminal of the Hall sensor 111, and the second terminal of the Hall sensor 111. At this time, the thermistor RN and the voltage divider resistor RF divide the power supply voltage and generate a first signal that is lower than the power supply voltage.

[0056] If Hall sensor 111 continuously detects rotation, control module 2 can detect the continuous changes in power supply voltage and the first signal, i.e., the high and low level second signal. Control module 2 can calculate the rotational speed of the load under test by detecting the switching frequency of the high and low levels of the second signal. The temperature detected by the thermistor RN can be detected by detecting the first signal.

[0057] This embodiment of the invention achieves magnetic field sensing by incorporating a Hall sensor. Together with a thermistor and a voltage divider resistor, it outputs a second signal, enabling effective detection of rotational speed and temperature, and demonstrating good detection performance.

[0058] Preferably, the rotational speed detection unit 11 may further include: an encoder, a magnetoelectric sensor, etc.

[0059] Figure 3 This is a schematic diagram of another detection circuit provided in an embodiment of the present invention. (Reference) Figure 3 Based on the above embodiments, optionally, the detection module further includes a current-limiting resistor R, which is connected between the temperature detection unit 12 and the control module 2, and is used to reduce the current input to the control module 2.

[0060] To prevent damage to the control module 2 due to excessive current input to the control module in the detection circuit, a current-limiting resistor R can be installed between the control module 2 and the temperature detection unit 12. The current-limiting resistor R increases the total resistance of the detection circuit, thereby limiting the current in the detection circuit to ensure it does not exceed the rated current that the control module 2 can withstand, thus ensuring that the control module 2 can operate normally and safely.

[0061] Continue to refer to Figure 3 Optionally, based on the above embodiments, the detection module further includes a transient voltage suppressor (TVS). The transient voltage suppressor (TVS) is connected between the temperature detection unit 2 and the ground terminal, and is used to limit the voltage in the detection circuit.

[0062] A transient voltage suppressor (TVS) is an electronic component used to protect electronic equipment from damage caused by transient overvoltages. TVS typically operates in reverse bias. When a transient overvoltage occurs in the detection circuit, the voltage across its terminals rises rapidly. When the TVS reaches its breakdown voltage, it immediately reverse-biasssss, exhibiting a low impedance state. This limits the overvoltage to a low level while allowing a large current to flow, dissipating the overvoltage energy and protecting the control module 2 and power supply from significant voltage surges.

[0063] Transient voltage suppressors (TVS) have extremely short response times, typically ranging from picoseconds (ps) to nanoseconds (ns). This allows them to react to transient overvoltages in a very short time, quickly clamping the voltage to a specified value and effectively protecting the components in the circuit.

[0064] This embodiment of the invention achieves voltage limitation on the detection circuit by setting a transient voltage suppressor, ensuring that the various components in the circuit are protected from damage by transient overvoltages such as electrostatic discharge and power surges.

[0065] Continue to refer to Figure 3 Based on the above embodiments, optionally, the detection module further includes: a filter capacitor C, connected between the control module 2 and the ground terminal, for filtering the voltage in the input control module 2.

[0066] The filter capacitor C is used to filter out AC components in the circuit, making the output voltage smoother and more stable. Furthermore, the filter capacitor C can selectively filter AC signals of different frequencies depending on its capacitance value. In practical applications, an appropriate capacitance value is often selected to filter out interference signals within a specific frequency range.

[0067] Figure 4 This is a schematic diagram of a voltage regulator unit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 4 Based on the above embodiments, optionally, the detection module further includes: a voltage regulator unit 4, connected between the power supply and the ground terminal, for regulating the power supply voltage. The voltage regulator unit 4 includes: a first capacitor C1 and a second capacitor C2, the first terminals of the first capacitor C1 and the second capacitor C2 are both connected to the power supply, and the second terminals of the first capacitor C1 and the second capacitor C2 are both connected to the ground terminal.

[0068] The power supply voltage often fluctuates. When the power supply voltage rises, the first capacitor C1 and the second capacitor C2 are charged, storing the excess charge. This is equivalent to storing a portion of the power supply's output energy in the first capacitor C1 and the second capacitor C2 in the form of electric field energy, thereby slowing down the rate of voltage rise.

[0069] When the power supply voltage drops, the first capacitor C1 and the second capacitor C2 discharge, releasing their stored charge to provide additional current to the detection circuit, thus maintaining voltage stability and preventing excessive voltage drop. Through this charging and discharging process, the first capacitor C1 and the second capacitor C2 smooth out fluctuations in the power supply voltage, making the output voltage more stable.

[0070] Figure 5 This is a schematic diagram of another detection circuit provided in an embodiment of the present invention. (Reference) Figure 5 Based on the above embodiments, the detection module may optionally include a connector 3 for connecting the thermistor RN and the voltage divider resistor RF.

[0071] Since the Hall sensor 111 and the thermistor RN are located inside the load under test, they can be connected to the voltage divider resistor RF outside the load under test via connector 3. Exemplarily, connector 3 can also be connected to a power supply and a ground terminal. Through connector 3, the first terminal of the Hall sensor 111 can be connected to a power supply, and the second terminal of the Hall sensor 111 can be grounded.

[0072] Optionally, the detection module provided in this embodiment of the present invention may be configured with multiple modules. Figure 5 An example of a detection circuit with three detection modules is shown.

[0073] The first detection module includes a Hall sensor 111, a first thermistor RN1, a first voltage divider resistor RF1, a first current-limiting resistor R1, a first transient voltage suppressor TVS1, and a third filter capacitor C3. The second detection module includes a Hall sensor 111, a second thermistor RN2, a second voltage divider resistor RF2, a second current-limiting resistor R2, a second transient voltage suppressor TVS2, and a fourth filter capacitor C4. The third detection module includes a Hall sensor 111, a third thermistor RN3, a third voltage divider resistor RF3, a third current-limiting resistor R3, a third transient voltage suppressor TVS3, and a fifth filter capacitor C5.

[0074] By setting up multiple detection modules, the Hall sensor 111 can be placed at multiple locations within the load under test, enabling precise detection of the load's rotational speed. Furthermore, by setting up the first thermistor RN1, the second thermistor RN2, and the third thermistor RN3, temperature detection at multiple locations within the load under test is achieved, resulting in more accurate temperature data. Moreover, multiple detection modules can operate simultaneously; if one module fails, the others can continue to detect temperature and rotational speed, ensuring high reliability.

[0075] This utility model embodiment also provides an autonomous operating device. This autonomous operating device includes: a load to be tested and a detection circuit provided in any embodiment of this utility model, possessing similar beneficial effects to the detection circuit, which will not be described in detail here.

[0076] For example, the autonomous operating device may include a lawnmower, and the load to be tested may include the motor in the lawnmower.

[0077] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0078] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A detection circuit, characterized in that, include: At least one detection module and one control module; The detection module is disposed inside the load under test, and the detection module is connected to the control module; the detection module includes: A temperature detection unit is connected between the power supply and the control module to generate a first signal. The control module is used to determine the temperature information of the load under test based on the first signal. A speed detection unit is connected between the power supply and the temperature detection unit. It is used to generate a second signal based on the standby state and working state of the load under test. The control module is used to determine the speed information of the load under test based on the frequency of the second signal.

2. The detection circuit according to claim 1, characterized in that, The rotation speed detection unit and the temperature detection unit are reused; The rotational speed detection unit generates the second signal through the temperature detection unit.

3. The detection circuit according to claim 1, characterized in that, The temperature detection unit includes: A thermistor is connected between the speed detection unit and the control module, and the thermistor is used to adjust its resistance value according to the internal temperature of the load under test. A voltage divider resistor is connected between the power supply and the control module, and the voltage divider resistor is used to divide the voltage of the thermistor.

4. The detection circuit according to claim 1, characterized in that, The rotational speed detection unit includes: A Hall sensor, wherein the first end of the Hall sensor is connected to a power supply, the second end of the Hall sensor is grounded, and the third end of the Hall sensor is connected to the temperature detection unit, and the Hall sensor is used to generate the second signal.

5. The detection circuit according to claim 1, characterized in that, The detection module also includes: A current-limiting resistor is connected between the temperature detection unit and the control module. The current-limiting resistor is used to reduce the current input to the control module.

6. The detection circuit according to claim 1, characterized in that, The detection module also includes: A transient voltage suppressor is connected between the temperature detection unit and the ground terminal, and the transient voltage suppressor is used to limit the voltage in the detection circuit.

7. The detection circuit according to claim 1, characterized in that, The detection module also includes: A filter capacitor is connected between the control module and the ground terminal to filter the voltage input to the control module.

8. The detection circuit according to claim 1, characterized in that, The detection module further includes: a voltage regulator unit, connected between the power supply and the ground terminal, for regulating the power supply voltage; The voltage regulator unit includes a first capacitor and a second capacitor, the first terminals of the first capacitor and the second capacitor are both connected to a power supply, and the second terminals of the first capacitor and the second capacitor are both connected to a ground terminal.

9. The detection circuit according to claim 3, characterized in that, The detection module further includes a connector for connecting the thermistor and the voltage divider resistor.

10. An autonomous operating device, characterized in that, include: The load under test and the detection circuit according to any one of claims 1-9.

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