CN217059098U - Temperature sampling circuit and electronic equipment - Google Patents
Temperature sampling circuit and electronic equipment Download PDFInfo
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- CN217059098U CN217059098U CN202220025340.XU CN202220025340U CN217059098U CN 217059098 U CN217059098 U CN 217059098U CN 202220025340 U CN202220025340 U CN 202220025340U CN 217059098 U CN217059098 U CN 217059098U
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Abstract
The application provides a temperature sampling circuit and electronic equipment, relates to the temperature sampling field. The temperature sampling circuit comprises a sensor module and an auxiliary module, wherein the auxiliary module is also used for being connected with a controller, the sensor module comprises a sensing element and a type switching unit, the sensing element is connected with the type switching unit, the auxiliary module is connected with the sensing element and the type switching unit, and the type switching unit is used for enabling the sensor module to be in different sensing types when the sensor module is in different conduction modes. The temperature sampling circuit provided by the application can enable the sensor module to be in different sensing types through different conduction modes of the switching type switching unit, so that switching of multiple types of sensors is realized in one circuit, and materials and manufacturing cost are effectively saved.
Description
Technical Field
The utility model relates to a temperature sampling technical field particularly, relates to a temperature sampling circuit and electronic equipment.
Background
At present, the temperature sampling technology is widely applied to various fields, and particularly in the new energy industry, along with the increase of the requirement on the performance of a motor, the precision of the temperature sampling of the motor is also continuously improved, so that the temperature of the motor can be better detected, and the motor is prevented from being demagnetized due to over-temperature and even leading to the performance reduction of the motor.
However, the types of the temperature sensors are many, and the temperature sensors of different types often need to be matched with different sampling circuits, so that the material cost and the manufacturing difficulty are increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a temperature sampling circuit and electronic equipment can realize the switching of multiple type sensor in a circuit, has effectively practiced thrift material and manufacturing cost.
The utility model provides a technical scheme:
in a first aspect, the present application provides a temperature sampling circuit, which includes a sensor module and an auxiliary module, where the auxiliary module is used to connect with a controller;
the sensor module comprises a sensing element and a type switching unit, the sensing element is connected with the type switching unit, and the auxiliary module is connected with the sensing element and the type switching unit;
the type switching unit is used for regulating and controlling the sensor module to be in different sensing types when the sensor module is in different conduction modes.
Optionally, the type switching unit includes a switch component and a thermal resistance component, the switch component includes a common terminal and n switching terminals, and the thermal resistance component includes n types of thermal resistances;
the common end of the switch assembly is connected with the sensing element and the auxiliary module, each switching end is connected with one thermal resistor, and each thermal resistor is grounded.
Optionally, the switch assembly includes a first switch end and a second switch end, and the thermal resistor assembly includes a first thermal resistor and a second thermal resistor;
the first switching end is connected with the first thermal resistor, and the second switching end is connected with the second thermal resistor.
Optionally, the first thermal resistor is a PT1000 platinum thermal resistor, and the second thermal resistor is a PT100 platinum thermal resistor.
Optionally, the type switching unit further includes a first capacitor, one end of the first capacitor is connected to the sensing element, and the other end of the first capacitor is grounded.
Optionally, the auxiliary module includes a first filtering unit, the first filtering unit includes a conjugated inductor, a first magnetic bead and a second magnetic bead, one end of the conjugated inductor is connected to the sensing element and the type switching unit, the other end of the conjugated inductor is connected to the first magnetic bead and the second magnetic bead, the first magnetic bead is connected to the controller, and the second magnetic bead is connected to the external power source.
Optionally, the auxiliary module further includes an amplifying unit, where the amplifying unit includes an operation subunit and a reference voltage subunit, and the operation subunit includes a first operational amplifier, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
one end of the third resistor is connected with the reference voltage subunit, and the other end of the third resistor is connected with the inverting input end of the first operational amplifier;
one end of the fourth resistor is connected with the output end of the first operational amplifier, and the other end of the fourth resistor is connected with the inverting input end of the first operational amplifier;
one end of the fifth resistor is connected with the positive input end of the first operational amplifier, and the other end of the fifth resistor is connected with the first magnetic bead;
one end of the sixth resistor is connected with the positive input end of the first operational amplifier, and the other end of the sixth resistor is grounded;
the output end of the first operational amplifier is connected with the controller.
Optionally, the reference voltage subunit includes a second operational amplifier, a seventh resistor, and an eighth resistor;
the seventh resistor is connected in series with the eighth resistor, the seventh resistor is grounded, the eighth resistor is externally connected with a power supply, the positive input end of the second operational amplifier is connected between the seventh resistor and the eighth resistor, and the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier;
and the output end of the second operational amplifier is connected with the third resistor.
Optionally, the auxiliary module further includes a second filtering unit, where the second filtering unit includes a ninth resistor, a tenth resistor, and a second capacitor;
one end of the ninth resistor is connected with the output end of the first operational amplifier, the other end of the ninth resistor is connected with the second capacitor, the tenth resistor and the controller, and the second capacitor and the tenth resistor are grounded.
In a second aspect, the present application further provides an electronic device including the temperature sampling circuit.
The utility model provides a pair of temperature sampling circuit and electronic equipment's beneficial effect is:
the application provides a temperature sampling circuit and electronic equipment, this temperature sampling circuit includes sensor module and auxiliary module, and auxiliary module still is used for being connected with the controller, and the sensor module includes sensing element and type switching unit, and sensing element is connected with type switching unit, and auxiliary module is connected with sensing element, type switching unit, and type switching unit is used for when being in different modes of conducting to make sensor module be in different sensing types. The temperature sampling circuit provided by the application can enable the sensor module to be in different sensing types through different conduction modes of the switching type switching unit, so that switching of various types of sensors is realized in one circuit, and materials and manufacturing cost are effectively saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic circuit diagram of a temperature sampling circuit according to an embodiment of the present invention;
fig. 2 is a second schematic circuit diagram of a temperature sampling circuit according to an embodiment of the present invention;
FIG. 3a is a graph of the temperature and voltage relationship corresponding to a PT1000 platinum thermistor;
FIG. 3b is a graph of the temperature and voltage relationship corresponding to PT100 platinum thermistor;
fig. 4 is a third schematic circuit diagram of a temperature sampling circuit according to an embodiment of the present invention;
fig. 5 is a fourth schematic diagram of a circuit structure of the temperature sampling circuit according to an embodiment of the present invention.
Icon: 100-a temperature sampling circuit; 10-a sensor module; 20-an auxiliary module; 110-a sensing element; 120-type switching unit; 1210-a switch assembly; 1220-a thermal resistance component; r1 — first thermal resistance; r2 — second thermal resistance; c1 — first capacitance; l1-conjugate inductance; FB1 — first magnetic bead; FB2 — second magnetic bead; 220-an amplifying unit; 2210-operator elements; 2220-reference voltage subcell; r3 — third resistance; r4-fourth resistor; r5 — fifth resistance; r6-sixth resistance; r7 — seventh resistor; r8 — eighth resistance; r9 — ninth resistor; r10 — tenth resistance; a1 — first operational amplifier; a2 — second operational amplifier; c2 — second capacitance; 230-a second filtering unit; 210-first filtering unit.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, or the orientation or positional relationship that a person skilled in the art usually understands, and it is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
As described in the background art, temperature sampling technology is widely used in various fields, and particularly in the new energy industry, as the demand for motor performance increases, the accuracy of motor temperature sampling is continuously improved, so that the motor temperature can be better detected, and demagnetization of the motor due to over-temperature is prevented, even the performance of the motor is reduced. However, the types of the temperature sensors are many, and the temperature sensors of different types often need to be matched with different sampling circuits, so that the material cost and the manufacturing difficulty are increased.
In view of the above, please refer to fig. 1 in combination, an embodiment of the present application provides a temperature sampling circuit 100, where the temperature sampling circuit 100 includes a sensor module 10 and an auxiliary module 20, and the auxiliary module 20 is further configured to be connected to a controller;
the sensor module 10 includes a sensing element 110 and a type switching unit 120, the sensing element 110 is connected to the type switching unit 120, and the auxiliary module 20 is connected to the sensing element 110 and the type switching unit 120;
the type switching unit 120 is used to regulate the sensor module 10 to be in different sensing types when being in different conduction modes.
In the present embodiment, the sensor element 110 and the type switching unit 120 jointly form the sensor module 10, in a specific implementation, the sensor element 110 may be a thermistor, the type switching unit 120 may include thermal resistors with different division degrees, and the type switching unit 120 may select different thermal resistors to be connected with the thermistor according to different conduction modes, so as to change the division degrees of the sensor module 10, and achieve the purpose of switching the types of the sensor module 10.
The temperature sampling circuit 100 provided in the embodiment of the present application can realize switching of multiple sensor types in one circuit by changing the conduction mode of the type switching unit 120, thereby effectively reducing the physical and manufacturing costs of temperature sampling.
In another alternative embodiment, referring to fig. 2, the type switching unit 120 includes a switch assembly 1210 and a thermal resistor assembly 1220, the switch assembly 1210 includes a common terminal and n switching terminals, the thermal resistor assembly 1220 includes n types of thermal resistors, the common terminal of the switch assembly 1210 is connected to the sensing element 110 and the auxiliary module 20, each switching terminal is connected to a thermal resistor, and each thermal resistor is grounded.
In this embodiment, the switching terminals are all connected to a single thermal resistor, and since the types of the thermal resistors are different, when the switching terminal is switched to a certain thermal resistor, the whole sensor module 10 is in the type corresponding to the thermal resistor, the types of the thermal resistors described herein may be divided according to the division value or according to other conditions, and are not limited specifically herein.
In another alternative embodiment, referring to fig. 3a, fig. 3b and fig. 4, the switch assembly 1210 includes a first switch terminal and a second switch terminal, the thermal resistor assembly 1220 includes a first thermal resistor R1 and a second thermal resistor R2, the first switch terminal is connected to the first thermal resistor R1, and the second switch terminal is connected to the second thermal resistor R2.
In this embodiment, the switch assembly 1210 includes two switching terminals, the corresponding thermal resistor assembly 1220 includes two different types of thermal resistors, and the type of the sensor module 10 can be switched by selecting the connection mode of the switch assembly 1210 and the thermal resistor assembly 1220.
In another alternative embodiment, first thermal resistor R1 is a PT1000 Pt thermistor and second thermal resistor R2 is a PT100 Pt thermistor.
The PT1000 PT thermistor and the PT100 PT thermistor in this embodiment are two different types of PT thermistors, and their respective temperature and voltage relationships are shown in fig. 3a and 3 b.
Optionally, with continued reference to fig. 4, the type switching unit 120 further includes a first capacitor C1, one end of the first capacitor C1 is connected to the sensing element 110, and the other end of the second capacitor C2 is grounded.
In this embodiment, the first capacitor C1 is connected to the sensor element 110, so as to perform a filtering function, thereby effectively improving the signal quality of the sensor module 10 and improving the sampling accuracy.
In another alternative embodiment, please continue to refer to fig. 4, the auxiliary module 20 includes a first filtering unit 210, the first filtering unit 210 includes a conjugate inductor L1, a first magnetic bead FB1 and a second magnetic bead FB2, one end of the conjugate inductor L1 is connected to the sensing element 110 and the type switching unit 120, the other end of the conjugate inductor L1 is connected to the first magnetic bead FB1 and the second magnetic bead FB2, the first magnetic bead FB1 is connected to the controller, and the second magnetic bead FB2 is connected to the external power source.
In this embodiment, the first filtering unit 210 is connected to the sensor module 10, and filters the sampling signal, so as to filter out high-frequency interference and common-mode interference, thereby improving the quality of the sampling signal and improving the sampling precision.
In another alternative embodiment, referring to fig. 5, the auxiliary module 20 further includes an amplifying unit 220, the amplifying unit 220 includes an operator unit 2210 and a reference voltage subunit 2220, the operator unit 2210 includes a first operational amplifier a1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
one end of the third resistor R3 is connected to the reference voltage subunit 2220, and the other end of the third resistor R3 is connected to the inverting input terminal of the first operational amplifier a 1;
one end of the fourth resistor R4 is connected with the output end of the first operational amplifier A1, and the other end of the fourth resistor R4 is connected with the inverting input end of the first operational amplifier A1;
one end of the fifth resistor R5 is connected with the positive input end of the first operational amplifier A1, and the other end of the fifth resistor R5 is connected with the first magnetic bead FB 1;
one end of the sixth resistor R6 is connected with the positive input end of the first operational amplifier A1, and the other end of the sixth resistor R6 is grounded;
the output of the first operational amplifier a1 is connected to the controller.
It should be noted that the reference voltage subunit 2220 is used to provide the reference voltage for the first operational amplifier a1 in this embodiment.
In this embodiment, the sampling signal is amplified by the operation subunit 2210, so that the accuracy of temperature sampling can be improved.
In another alternative embodiment, referring to fig. 5, the reference voltage subunit 2220 includes a second operational amplifier a2, a seventh resistor R7 and an eighth resistor R8, wherein the seventh resistor R7 is connected to the eighth resistor R8 in series, the seventh resistor R7 is connected to ground, the eighth resistor R8 is connected to an external power source, the positive input terminal of the second operational amplifier a2 is connected between the seventh resistor R7 and the eighth resistor R8, the inverting input terminal of the second operational amplifier a2 is connected to the output terminal of the second operational amplifier a2, and the output terminal of the second operational amplifier a2 is connected to the third resistor R3.
In a traditional circuit, a resistance voltage division mode is generally adopted to provide reference voltage, due to the problem of equivalent resistance, deviation often exists between a theoretical value and an actual value of the reference voltage provided in the mode, and the calculation of the reference voltage through the Thevenin theorem is complex. Therefore, in the present embodiment, the first operational amplifier a1 is provided with a high-precision reference voltage by adopting a voltage follower manner, thereby improving the sampling precision.
In another alternative embodiment, please continue to refer to fig. 5, the auxiliary module 20 further includes a second filtering unit 230, the second filtering unit 230 includes a ninth resistor R9, a tenth resistor R10 and a second capacitor C2, one end of the ninth resistor R9 is connected to the output end of the first operational amplifier a1, the other end of the ninth resistor R9 is connected to the second capacitor C2, the tenth resistor R10 and the controller, and the second capacitor C2 and the tenth resistor R10 are grounded.
In this embodiment, the second filtering unit 230 is substantially a low-pass filter, and can filter out high-frequency interference in the output signal of the amplifying unit 220, improve the quality of the signal received by the controller, and prevent noise interference from causing temperature jump and falsely triggering an over-temperature fault.
It should be noted that, in this embodiment, the voltage range of the controller is between 0.15V and 3.2V, and the accuracy of temperature sampling can be improved due to a higher voltage span. Similarly, a short circuit and open circuit detection function can be set in the controller, when the voltage collected by the controller is 0, the controller judges that an open circuit occurs in the temperature sampling circuit and reports an open circuit fault, and when the voltage collected by the controller reaches the maximum value, the controller judges that a short circuit occurs in the temperature sampling circuit and reports a short circuit fault.
In this embodiment, the output offset voltage is different according to the operational amplifier, and in this embodiment, the highest output voltage of the first operational amplifier is preferably 4V.
In a specific embodiment, the sampled input voltage is different according to different controllers, and a low dropout diode may be connected to the output terminal of the amplifying unit for protecting the controller according to different requirements.
Since the precision of the power supply voltage may also affect the sampling precision of the temperature sampling circuit, in a specific embodiment, the power supply voltage adjustment bias may also be corrected by software, which is not described herein again.
The embodiment of the present application further provides an electronic device, which includes the temperature sampling circuit 100.
For better understanding of the technical solutions provided by the embodiments of the present application, please continue to refer to fig. 4, and the assignment process of each element will be described in detail below.
When the first switching end of the switch assembly is closed and the second switching end is opened, a first thermal resistor R1 is selected, and the sensor is a PT1000 motor temperature sensor, and the following calculation is carried out.
Output voltage of the resistance voltage-dividing circuit:
reference voltage module output voltage:
calculating the output voltage of the operational amplifier according to the virtual short and virtual break of the operational amplifier:
the input voltage to the MCU is derived by dividing through R9 and R10:
cutoff frequency of RC low pass filter:
when the first switching end of the switch assembly is disconnected and the second switching end is closed, the second thermal resistor R2 is selected, and the sensor is a PT100 motor temperature sensor, and the following calculation is carried out.
At this time, the output voltage of the resistance voltage-dividing circuit:
reference voltage module output voltage:
calculating the output voltage of the operational amplifier through the virtual short and the virtual break of the operational amplifier:
027 the input voltage to the MCU is derived by dividing by R9 and R10:
cutoff frequency of RC low pass filter:
assigning values to the resistor, the capacitor and the VCC according to design requirements:
R1＝1.25kΩ、R2＝125Ω、R3＝10kΩ、R4＝33kΩ、R5＝10kΩ、R8＝3k Ω、R7＝2kΩ、R6＝33kΩ、R9＝1kΩ、R10＝11kΩ、C1＝100nF、C2＝100nF、VCC＝5V。
the embodiment of the application provides a temperature sampling circuit and electronic equipment, the temperature sampling circuit comprises a sensor module and an auxiliary module, the auxiliary module is further used for being connected with a controller, the sensor module comprises a sensing element and a type switching unit, the sensing element is connected with the type switching unit, the auxiliary module is connected with the sensing element and the type switching unit, and the type switching unit is used for enabling the sensor module to be in different sensing types when the sensor module is in different conduction modes. The temperature sampling circuit provided by the application can enable the sensor module to be in different sensing types through different conduction modes of the switching type switching unit, so that switching of multiple types of sensors is realized in one circuit, and materials and manufacturing cost are effectively saved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The temperature sampling circuit is characterized by comprising a sensor module and an auxiliary module, wherein the auxiliary module is used for being connected with a controller;
the sensor module comprises a sensing element and a type switching unit, the sensing element is connected with the type switching unit, and the auxiliary module is connected with the sensing element and the type switching unit;
the type switching unit is used for regulating and controlling the sensor module to be in different sensing types when the sensor module is in different conduction modes.
2. The temperature sampling circuit of claim 1, wherein the type switching unit comprises a switching component and a thermal resistance component, the switching component comprising a common terminal and n switching terminals, the thermal resistance component comprising n types of thermal resistances;
the common end of the switch component is connected with the sensing element and the auxiliary module, each switching end is connected with one thermal resistor, and each thermal resistor is grounded.
3. The temperature sampling circuit of claim 2, wherein the switch assembly comprises a first switch terminal and a second switch terminal, and the thermal resistance assembly comprises a first thermal resistance and a second thermal resistance;
the first switching end is connected with the first thermal resistor, and the second switching end is connected with the second thermal resistor.
4. The temperature sampling circuit of claim 3, wherein the first thermal resistor is a PT1000 platinum thermistor and the second thermal resistor is a PT100 platinum thermistor.
5. The temperature sampling circuit according to claim 1, wherein the type switching unit further comprises a first capacitor, one end of the first capacitor is connected to the sensing element, and the other end of the first capacitor is grounded.
6. The temperature sampling circuit according to claim 1, wherein the auxiliary module comprises a first filtering unit, the first filtering unit comprises a conjugated inductor, a first magnetic bead and a second magnetic bead, one end of the conjugated inductor is connected to the sensing element and the type switching unit, the other end of the conjugated inductor is connected to the first magnetic bead and the second magnetic bead, the first magnetic bead is connected to the controller, and the second magnetic bead is connected to an external power source.
7. The temperature sampling circuit of claim 6, wherein the auxiliary module further comprises an amplifying unit, the amplifying unit comprises an operation subunit and a reference voltage subunit, and the operation subunit comprises a first operational amplifier, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
one end of the third resistor is connected with the reference voltage subunit, and the other end of the third resistor is connected with the inverting input end of the first operational amplifier;
one end of the fourth resistor is connected with the output end of the first operational amplifier, and the other end of the fourth resistor is connected with the inverting input end of the first operational amplifier;
one end of the fifth resistor is connected with the positive input end of the first operational amplifier, and the other end of the fifth resistor is connected with the first magnetic bead;
one end of the sixth resistor is connected with the positive input end of the first operational amplifier, and the other end of the sixth resistor is grounded;
the output end of the first operational amplifier is connected with the controller.
8. The temperature sampling circuit of claim 7, wherein the reference voltage subunit comprises a second operational amplifier, a seventh resistor, and an eighth resistor;
the seventh resistor is connected in series with the eighth resistor, the seventh resistor is grounded, the eighth resistor is externally connected with a power supply, the positive input end of the second operational amplifier is connected between the seventh resistor and the eighth resistor, and the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier;
and the output end of the second operational amplifier is connected with the third resistor.
9. The temperature sampling circuit of claim 8, wherein the auxiliary module further comprises a second filtering unit comprising a ninth resistor, a tenth resistor, and a second capacitor;
one end of the ninth resistor is connected with the output end of the first operational amplifier, the other end of the ninth resistor is connected with the second capacitor, the tenth resistor and the controller, and the second capacitor and the tenth resistor are grounded.
10. An electronic device comprising the temperature sampling circuit of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220025340.XU CN217059098U (en) | 2022-01-06 | 2022-01-06 | Temperature sampling circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220025340.XU CN217059098U (en) | 2022-01-06 | 2022-01-06 | Temperature sampling circuit and electronic equipment |
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| CN217059098U true CN217059098U (en) | 2022-07-26 |
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| CN202220025340.XU Active CN217059098U (en) | 2022-01-06 | 2022-01-06 | Temperature sampling circuit and electronic equipment |
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