CN116499523A - Multifunctional sampling device and system - Google Patents
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- CN116499523A CN116499523A CN202310376868.0A CN202310376868A CN116499523A CN 116499523 A CN116499523 A CN 116499523A CN 202310376868 A CN202310376868 A CN 202310376868A CN 116499523 A CN116499523 A CN 116499523A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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Abstract
The application provides a multifunctional sampling device and a system, wherein the device comprises a control circuit, a voltage and current sampling circuit and a temperature sampling circuit, and the voltage and current sampling circuit is connected to the control circuit; the temperature sampling circuit is connected to the control circuit and the voltage and current sampling circuit; in the voltage sampling stage, the control circuit outputs a voltage sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so as to enable the voltage and current sampling circuit to sample the voltage; in the current sampling stage, the control circuit outputs a current sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so as to enable the voltage and current sampling circuit to perform current sampling; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so that the temperature sampling circuit performs temperature sampling. By the aid of the scheme, sampling reliability is improved, and complexity of a circuit structure is reduced.
Description
Technical Field
The disclosed embodiments of the present application relate to the field of power electronics technology, and more particularly, to a multifunctional sampling device and system.
Background
In the application scenario of the frequency converter, voltage, current and motor temperature are usually required to be sampled, and circuit designs are correspondingly different due to different sampling objects.
In order to sample different parameters when the frequency converter works, different sampling circuits are generally configured independently, or the different sampling circuits are manually adjusted to sample various parameters, so that the circuit structure is complex and the reliability is low.
Therefore, how to reduce the complexity of the circuit structure and improve the reliability is a problem to be solved.
Disclosure of Invention
According to an embodiment of the present application, the present invention provides a multifunctional sampling device and system, so as to reduce complexity of a circuit structure and improve reliability.
According to an aspect of the present application, an exemplary multifunctional sampling device is disclosed, comprising a control circuit, a voltage-current sampling circuit, and a temperature sampling circuit, the voltage-current sampling circuit being connected to the control circuit; a temperature sampling circuit connected to the control circuit and the voltage-current sampling circuit; in the voltage sampling stage, the control circuit outputs a voltage sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so that the voltage and current sampling circuit performs voltage sampling; in a current sampling stage, the control circuit outputs a current sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so as to enable the voltage and current sampling circuit to perform current sampling; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so that the temperature sampling circuit performs temperature sampling.
According to the scheme, the sampling mode is switched through the control circuit, so that the manual switching is avoided, and the reliability is improved; and the voltage, the current and the temperature are sampled under the control of the control circuit, so that the complexity of the circuit structure is reduced.
Wherein, the voltage current sampling circuit includes: the voltage and current sampling path is connected to the input end of the voltage and current sampling circuit, and a signal to be sampled flows into the voltage and current sampling path from the input end of the voltage and current sampling circuit; a sampling control path connected to the control circuit and the input end of the voltage and current sampling circuit; in the voltage sampling stage, the control circuit outputs a voltage sampling control signal, and the connection between the sampling control path and the voltage and current sampling path is disconnected so that the voltage and current sampling path performs voltage sampling; in the current sampling stage, the control circuit outputs a current sampling control signal, and the connection between the sampling control path and the voltage current sampling path is conducted so that the voltage current sampling path performs current sampling.
Wherein the sampling control path includes: the control end of the first controllable switch element is connected to the control circuit, and the first controllable switch element is connected in the sampling control path and used for controlling the on-off of the sampling control path; a current sampling resistor, one end of which is connected in series with the controllable switch element, and the other end of which is grounded; in the voltage sampling stage, the control circuit outputs a voltage sampling control signal to the control end of the first controllable switching element, the first controllable switching element is disconnected, and a signal to be sampled does not flow through the current sampling resistor, so that the voltage and current sampling path performs voltage sampling; in the current sampling stage, the control circuit outputs a current sampling control signal to the control end of the first controllable switching element, the first controllable switching element is conducted, and a signal to be sampled flows through the current sampling resistor so that the voltage and current sampling path performs current sampling.
Wherein, the temperature sampling circuit includes: a temperature sampling path into which a temperature sampling signal flows from an input of the temperature sampling path; at least one temperature matching path connected between the power supply and the input end of the temperature sampling path, and selectively turned on or off based on the control signal output by the control circuit; in the voltage sampling or current sampling stage, the control circuit outputs a voltage sampling control signal or a current sampling control signal, and the temperature matching paths are all disconnected; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal, one of the temperature matching paths is conducted, and an adjustable signal is generated and output to the input end of the temperature sampling path.
Wherein the at least one temperature matching path comprises: the control end of the second controllable switch element is connected to the control circuit, and the second controllable switch element is connected to the temperature matching path and used for controlling the on-off of the temperature matching path; an adjustable signal output module that outputs an adjustable signal to the temperature sampling path based on a voltage of the power supply and an ambient temperature with the second controllable switching element turned on; in the voltage sampling or current sampling stage, the control circuit outputs a voltage sampling control signal or a current sampling control signal, and the second controllable switching element is disconnected; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal, one of the at least one temperature matching path is conducted, and an adjustable signal is output to the input end of the temperature sampling path.
The adjustable signal output module comprises a temperature matching resistor.
Wherein the control circuit includes: and the analog signal receiving end is connected to the output ends of the voltage and current sampling circuit and the temperature sampling circuit, so that the control circuit generates a sampling result based on the output signals of the voltage and current sampling circuit and the temperature sampling circuit.
Wherein the voltage-current sampling path comprises: the input filtering module is connected to the input end of the voltage and current sampling circuit; the at least one following module is connected between the input filtering module and the output end of the voltage and current sampling circuit; the voltage dividing circuit is connected between the following module and the output end of the voltage and current sampling circuit; the first output filter module is connected between the voltage dividing circuit and the output end of the voltage and current sampling circuit.
The temperature sampling path comprises an amplifying module and a second output filtering module, and the amplifying module and the second output filtering module are sequentially connected between the input end and the output end of the temperature sampling path.
According to another aspect of the present application, a multifunctional sampling system is disclosed, comprising a motor, a frequency converter, and the multifunctional sampling device of the first aspect.
According to the scheme, the sampling mode is switched through the control circuit, so that the manual switching is avoided, and the reliability is improved; and the voltage, the current and the temperature are sampled under the control of the control circuit, so that the complexity of the circuit structure is reduced.
Drawings
The application will be further described with reference to the accompanying drawings and embodiments, in which:
FIG. 1 is a schematic diagram of a frame structure of an embodiment of a multifunctional sampling device of the present application;
FIG. 2 is a schematic circuit diagram of an embodiment of a voltage and current sampling circuit according to the present application;
FIG. 3 is a schematic circuit diagram of an embodiment of a temperature sampling circuit of the present application;
fig. 4 is a schematic circuit diagram of an embodiment of the control circuit of the present application.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application are described in further detail below with reference to the accompanying drawings and the detailed description.
In accordance with an aspect of the present application, an exemplary multifunctional sampling device is disclosed, referring to fig. 1, fig. 1 is a schematic diagram of a frame structure of an embodiment of the multifunctional sampling device of the present application; specifically, the device comprises a control circuit 10, a voltage and current sampling circuit 20 and a temperature sampling circuit 30, wherein the voltage and current sampling circuit 20 is connected to the control circuit 10; a temperature sampling circuit 30 connected to the control circuit 10 and the voltage-current sampling circuit 20; wherein, in the voltage sampling stage, the control circuit 10 outputs a voltage sampling control signal to the voltage and current sampling circuit 20 and the temperature sampling circuit 30, so that the voltage and current sampling circuit 20 performs voltage sampling; in the current sampling stage, the control circuit 10 outputs a current sampling control signal to the voltage-current sampling circuit 20 and the temperature sampling circuit 30 to cause the voltage-current sampling circuit 20 to perform current sampling; in the temperature sampling stage, the control circuit 10 outputs a temperature sampling control signal to the voltage-current sampling circuit 20 and the temperature sampling circuit 30 so that the temperature sampling circuit 30 performs temperature sampling.
According to the scheme, the sampling mode is switched through the control circuit 10, so that the manual switching is avoided, and the reliability is improved; and the control circuit 10 is used for controlling the voltage and the current and the temperature to be sampled, so that the complexity of the circuit structure is reduced.
In a possible embodiment, please continue to refer to fig. 1, after the signal to be sampled enters the voltage-current sampling circuit 20, the signal to be sampled is filtered by the input filtering module 211 (not shown in the figure), and the filtered signal to be sampled enters the temperature sampling circuit 30, and is subjected to temperature sampling in the temperature sampling stage; specifically, the input filter module 211 may be a module that is separately provided, or may be integrated in the voltage-current sampling circuit 20; in other possible embodiments, the input filtering module 211 may be disposed in both the voltage and current sampling circuit 20 and the temperature sampling circuit 30, and the signal to be sampled may directly enter the voltage and current sampling circuit 20 or the temperature sampling circuit 30 to obtain the filtered signal to be sampled.
Referring to fig. 1, the control circuit 10 outputs a sampling control signal to the voltage and current sampling circuit 20 and the temperature sampling circuit 30 for controlling the sampling mode, and after the sampling signal passes through the voltage and current sampling circuit 20 or the temperature sampling circuit 30 to obtain a corresponding sampling signal, the sampling signal is fed back to the control circuit 10, so as to obtain a corresponding sampling result.
In one possible implementation, please refer to fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of the voltage-current sampling circuit 20 of the present application; specifically, the voltage-current sampling circuit 20 includes: a voltage-current sampling path 210 connected to an input terminal of the voltage-current sampling circuit 20, and a signal to be sampled flows into the voltage-current sampling path 210 from the input terminal of the voltage-current sampling circuit 20; a sampling control path 220 connected to the input terminals of the control circuit 10 and the voltage-current sampling circuit 20; in the voltage sampling stage, the control circuit 10 outputs a voltage sampling control signal, and the connection between the sampling control path 220 and the voltage current sampling path 210 is disconnected, so that the voltage current sampling path 210 performs voltage sampling; in the current sampling phase, the control circuit 10 outputs a current sampling control signal, and the connection between the sampling control path 220 and the voltage current sampling path 210 is turned on, so that the voltage current sampling path 210 performs current sampling.
According to the scheme, the circuit structures of the voltage sampling and the current sampling can be partially overlapped, so that the existing resources are fully utilized, and the complexity of the circuit structure is further reduced.
In some possible embodiments, please continue with fig. 2, the sampling control path 220 includes: the control end of the first controllable switching element Q1 is connected to the control circuit 10, and the first controllable switching element Q1 is connected in the sampling control path 220 and used for controlling the on-off of the sampling control path 220; a current sampling resistor, one end of which is connected in series with the controllable switch element, and the other end of which is grounded; in the voltage sampling stage, the control circuit 10 outputs a voltage sampling control signal to the control end of the first controllable switching element Q1, the first controllable switching element Q1 is turned off, and the signal to be sampled does not flow through the current sampling resistor, so that the voltage and current sampling path 210 performs voltage sampling; in the current sampling stage, the control circuit 10 outputs a current sampling control signal to the control terminal of the first controllable switching element Q1, the first controllable switching element Q1 is turned on, and the signal to be sampled flows through the current sampling resistor, so that the voltage and current sampling path 210 performs current sampling.
In a specific implementation scenario, the first controllable switching element Q1 may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), where a gate of the MOSFET is connected to the control circuit 10, the control circuit 10 outputs a high level or low level sampling control signal, and the MOSFET is turned on or off under the driving of the gate voltage to control the voltage-current sampling circuit 20 to perform voltage sampling or current sampling; in other possible implementation scenarios, the first controllable switching element Q1 may also be another controllable semiconductor switching device, or a controllable switching element such as a photocoupler, a relay, or the like, which is not limited herein.
In some possible embodiments, referring to fig. 2, the voltage and current sampling path 210 further includes an input filtering module 211 connected to the input terminal of the voltage and current sampling circuit 20; at least one follower module 212 connected between the input filter module 211 and the output terminal of the voltage-current sampling circuit 20; a voltage dividing circuit 213 connected between the follower block 212 and the output terminal of the voltage-current sampling circuit 20; the first output filter module 214 is connected between the voltage dividing circuit 213 and the output terminal of the voltage and current sampling circuit 20.
In a specific implementation scenario, please continue to refer to fig. 2, the signal to be sampled is filtered by the input filtering module 211, and enters the voltage-current sampling path 210 and the temperature sampling circuit 30; the input filter module 211 may adopt a resistive-capacitive parallel filter, and the selection and the number of the resistors and the capacitors are not limited in this application.
In a specific implementation scenario, please continue to refer to fig. 2, the following module 212 may use an integrated voltage comparator to form a voltage follower, and in other implementation scenarios, a voltage follower composed of transistors may also be used; the follower block 212 may be disposed between the input filter block 211 and the voltage dividing circuit 213 and between the voltage dividing circuit 213 and the first output filter block 214, respectively, and in other scenarios, the follower block 212 may be disposed only between the input filter block 211 and the voltage dividing circuit 213.
In a specific implementation scenario, please continue to refer to fig. 2, the voltage divider 213 may include a resistor R1 and a resistor R2, and further obtain the voltage or the current of the signal to be sampled by detecting the voltage divided by the resistor R2.
In a specific implementation scenario, please continue to refer to fig. 2, the first output filtering module 214 may employ resistive-capacitive filtering, and the specific circuit structure of the first output filtering module 214 is not limited in this application.
In some possible implementation scenarios, please refer to fig. 3, fig. 3 is a schematic circuit diagram of an embodiment of a temperature sampling circuit of the present application; the temperature sampling circuit 30 includes: a temperature sampling path 310, the temperature sampling signal flowing into the temperature sampling path 310 from an input of the temperature sampling path 310; at least one temperature matching path 320 connected between the power source VCC and the input terminal of the temperature sampling path 310, selectively turned on or off based on the control signal outputted from the control circuit 10; wherein, during the voltage sampling or current sampling phase, the control circuit 10 outputs a voltage sampling control signal or a current sampling control signal, and the temperature matching path 320 is all disconnected; in the temperature sampling phase, the control circuit 10 outputs a temperature sampling control signal, one of the temperature matching paths 320 is turned on, and an adjustable signal is generated and output to the input terminal of the temperature sampling path.
In some possible embodiments, the at least one temperature matching path 320 includes: the control end of the second controllable switching element Q2 is connected to the control circuit 10, and the second controllable switching element Q2 is connected in the temperature matching path 320 and is used for controlling the on-off of the temperature matching path 320; an adjustable signal output module 321 that outputs an adjustable signal to the temperature sampling path 310 based on the voltage of the power supply and the ambient temperature with the second controllable switching element Q2 turned on; wherein, in the voltage sampling or current sampling stage, the control circuit 10 outputs a voltage sampling control signal or a current sampling control signal, and the second controllable switching element Q2 is turned off; in the temperature sampling phase, the control circuit 10 outputs a temperature sampling control signal, one of the at least one temperature matching paths 320 is turned on, and outputs an adjustable signal to the input terminal of the temperature sampling path 310.
In a specific implementation scenario, please continue to refer to fig. 3, the adjustable signal output module 321 includes a temperature matching resistor R3, and the temperature matching resistor R3 can adjust its own resistance value based on different ambient temperatures, so as to adjust the current signal output by the adjustable signal output module 321 when the temperatures are different.
In a specific implementation scenario, please continue to refer to fig. 3, the temperature matching paths 320 may include two temperature matching resistors R3 in each temperature matching path 320, and exemplary types of the temperature matching resistors R3 may be KTY84 and PT1000, respectively, which have different temperature measurement ranges and temperature measurement accuracies, and the corresponding temperature matching paths 320 may be selected to be connected to the temperature sampling paths 310 according to needs, and specifically, the control circuit 10 may output a sampling control signal to the corresponding second controllable switching element Q2, so that the second controllable switching element Q2 on the temperature matching path 320 to be connected is turned on, and correspondingly, the other second controllable switching element Q2 is turned off; in other specific implementations, the temperature matching path 320 may further include 3, 4, etc., which are not limited herein.
In a specific implementation scenario, please continue to refer to fig. 3, the second controllable switching element Q2 may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a gate of the MOSFET is connected to the control circuit 10, the control circuit 10 outputs a high level or low level sampling control signal, and the MOSFET is turned on or off under the driving of the gate voltage to control the corresponding temperature matching path 320 to be connected to or not connected to the temperature sampling path 310; in other possible implementation scenarios, the second controllable switching element Q2 may also be another controllable semiconductor switching device, or a controllable switching element such as a photocoupler, a relay, etc., which is not limited herein.
In one possible embodiment, the temperature sampling path 310 includes an amplifying module 311 and a second output filtering module 312, the amplifying module 311 and the second output filtering module 312 being connected in sequence between an input and an output of the temperature sampling path 310.
In one possible implementation, please refer to fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of a control circuit of the present application; the control circuit 10 may include: an analog signal receiving terminal 110 connected to the output terminals of the voltage and current sampling circuit 20 and the temperature sampling circuit 30, so that the control circuit 10 receives the output signals of the voltage and current sampling circuit 20 and the temperature sampling circuit 30 and generates a sampling result.
In a specific implementation scenario, please continue to refer to fig. 4, the control circuit 10 may further include a sampling control signal output circuit 120, where the sampling control signal output circuit 120 may include a plurality of sampling control signal output paths, where sampling control signal output ends of the sampling control signal output paths are respectively used to output a voltage sampling control signal, a current sampling control signal, and a temperature sampling control signal, and specifically, the sampling control signal output paths may include a triode, where a base electrode of the triode is connected to an output pin of a Micro Control Unit (MCU), a corresponding output pin of the MCU outputs a corresponding voltage signal, the triode is turned on or off under the driving of the base voltage, a collector electrode of the triode is connected to a power supply through a resistor, an emitter electrode of the triode is grounded, and when the triode is turned on, the corresponding sampling control signal output end outputs a low-level sampling control signal, and when the triode is turned off, the corresponding sampling control signal output end outputs a high-level sampling control signal; the power supply voltage connected with the triode can be 5.5V or other voltage values, and the power supply voltage is not limited in the application; in other specific implementations, the transistor in the sampling signal output path may be replaced by other controllable semiconductor switching devices, which are not limited in this application.
According to another aspect of the present application, a multifunctional sampling system is disclosed, comprising a motor, a frequency converter, and the multifunctional sampling device of the first aspect.
According to the scheme, the sampling mode is switched through the control circuit 10, so that the manual switching is avoided, and the reliability is improved; and the control circuit 10 is used for controlling the voltage and the current and the temperature to be sampled, so that the complexity of the circuit structure is reduced.
Those skilled in the art will readily appreciate that many modifications and variations are possible in the device and method while maintaining the teachings of the present application. Accordingly, the above disclosure should be viewed as limited only by the scope of the appended claims.
Claims (10)
1. A multifunctional sampling device, comprising:
a control circuit;
a voltage-current sampling circuit connected to the control circuit;
a temperature sampling circuit connected to the control circuit and the voltage-current sampling circuit;
in the voltage sampling stage, the control circuit outputs a voltage sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so that the voltage and current sampling circuit performs voltage sampling; in a current sampling stage, the control circuit outputs a current sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so as to enable the voltage and current sampling circuit to perform current sampling; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal to the voltage and current sampling circuit and the temperature sampling circuit so that the temperature sampling circuit performs temperature sampling.
2. The apparatus of claim 1, wherein the voltage-current sampling circuit comprises:
the voltage and current sampling path is connected to the input end of the voltage and current sampling circuit, and a signal to be sampled flows into the voltage and current sampling path from the input end of the voltage and current sampling circuit;
a sampling control path connected to the control circuit and the input end of the voltage and current sampling circuit;
in the voltage sampling stage, the control circuit outputs a voltage sampling control signal, and the connection between the sampling control path and the voltage and current sampling path is disconnected so that the voltage and current sampling path performs voltage sampling; in the current sampling stage, the control circuit outputs a current sampling control signal, and the connection between the sampling control path and the voltage current sampling path is conducted so that the voltage current sampling path performs current sampling.
3. The apparatus of claim 2, wherein the sampling control path comprises:
the control end of the first controllable switch element is connected to the control circuit, and the first controllable switch element is connected in the sampling control path and used for controlling the on-off of the sampling control path;
a current sampling resistor, one end of which is connected in series with the controllable switch element, and the other end of which is grounded;
in the voltage sampling stage, the control circuit outputs a voltage sampling control signal to the control end of the first controllable switching element, the first controllable switching element is disconnected, and a signal to be sampled does not flow through the current sampling resistor, so that the voltage and current sampling path performs voltage sampling; in the current sampling stage, the control circuit outputs a current sampling control signal to the control end of the first controllable switching element, the first controllable switching element is conducted, and a signal to be sampled flows through the current sampling resistor so that the voltage and current sampling path performs current sampling.
4. The apparatus of claim 1, wherein the temperature sampling circuit comprises:
a temperature sampling path into which a temperature sampling signal flows from an input of the temperature sampling path;
at least one temperature matching path connected between the power supply and the input end of the temperature sampling path, and selectively turned on or off based on the control signal output by the control circuit;
in the voltage sampling or current sampling stage, the control circuit outputs a voltage sampling control signal or a current sampling control signal, and the temperature matching paths are all disconnected; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal, one of the temperature matching paths is conducted, and an adjustable signal is generated and output to the input end of the temperature sampling path.
5. The apparatus of claim 4, wherein the at least one temperature matching path comprises:
the control end of the second controllable switch element is connected to the control circuit, and the second controllable switch element is connected to the temperature matching path and used for controlling the on-off of the temperature matching path;
an adjustable signal output module that outputs an adjustable signal to the temperature sampling path based on a voltage of the power supply and an ambient temperature with the second controllable switching element turned on;
in the voltage sampling or current sampling stage, the control circuit outputs a voltage sampling control signal or a current sampling control signal, and the second controllable switching element is disconnected; in the temperature sampling stage, the control circuit outputs a temperature sampling control signal, one of the at least one temperature matching path is conducted, and an adjustable signal is output to the input end of the temperature sampling path.
6. The apparatus of claim 5, wherein the adjustable signal output module comprises a temperature matched resistor.
7. The apparatus of claim 1, wherein the control circuit comprises:
and the analog signal receiving end is connected to the output ends of the voltage and current sampling circuit and the temperature sampling circuit, so that the control circuit generates a sampling result based on the output signals of the voltage and current sampling circuit and the temperature sampling circuit.
8. The apparatus of claim 2, wherein the voltage-current sampling path comprises:
the input filtering module is connected to the input end of the voltage and current sampling circuit;
the at least one following module is connected between the input filtering module and the output end of the voltage and current sampling circuit;
the voltage dividing circuit is connected between the following module and the output end of the voltage and current sampling circuit;
the first output filter module is connected between the voltage dividing circuit and the output end of the voltage and current sampling circuit.
9. The apparatus of claim 4, wherein the temperature sampling path comprises an amplification module and a second output filter module, the amplification module and the second output filter module being connected in sequence between an input and an output of the temperature sampling path.
10. A multifunctional sampling system comprising a motor and a frequency converter, and further comprising the multifunctional sampling device of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310376868.0A CN116499523A (en) | 2023-04-10 | 2023-04-10 | Multifunctional sampling device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310376868.0A CN116499523A (en) | 2023-04-10 | 2023-04-10 | Multifunctional sampling device and system |
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| CN116499523A true CN116499523A (en) | 2023-07-28 |
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| CN202310376868.0A Pending CN116499523A (en) | 2023-04-10 | 2023-04-10 | Multifunctional sampling device and system |
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