CN111736029B - Power module output external load type identification system and method - Google Patents
Power module output external load type identification system and method Download PDFInfo
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- CN111736029B CN111736029B CN202010741487.4A CN202010741487A CN111736029B CN 111736029 B CN111736029 B CN 111736029B CN 202010741487 A CN202010741487 A CN 202010741487A CN 111736029 B CN111736029 B CN 111736029B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/02—Measuring effective values, i.e. root-mean-square values
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- G—PHYSICS
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- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The invention relates to a system and a method for identifying the type of an external load output by a power module, wherein the identification method comprises the following steps: a method for identifying the type of an external load output by a power module comprises the following steps: acquiring a load parameter detection instruction to control a power supply module to output a first current; acquiring a first current value and a first voltage value, and obtaining a first impedance value of the load, which is marked as Z1; sending a sinusoidal current instruction to the power supply module, and collecting a second current value and a second voltage value; calculating to obtain a second impedance value of the load, and recording as Z2; and comparing the first impedance value Z1 with the second impedance value Z2, if Z2 is more than or equal to 0.9X Z1 and less than or equal to Z2 and less than or equal to 1.1X Z1, judging that the load is resistive, if Z2 is more than 1.1X Z1, judging that the load is inductive, and otherwise, repeating the calculation. The invention does not need to stop to cut off the output load circuit for detection, thereby greatly improving the operation safety and the maintainability of the equipment.
Description
Technical Field
The invention relates to the technical field of load identification and detection, in particular to a system and a method for identifying the type of an external load output by a power module.
Background
An XC power module with 8KW output power can provide controllable variable current in the range of-20A to +20A for an external coil. In order to ensure the reliability of the power system, the XC power module is required to identify whether the output external load is a resistive (20 Ω, inductive resistance no more than 0.1 mH) or inductive (dc impedance no more than 1 Ω,100 mH) load type, but it is not necessary to measure the accurate resistance or inductance of the load. At present, when the XC power module outputs fixed current, the output current value and the port voltage value are sampled and read only through the XC power module, the resistance value is obtained through a calculation formula, if the external load type needs to be judged, the manual shutdown is needed to disconnect the output load circuit for detection, the operation process is complicated, and certain safety risk exists.
Disclosure of Invention
In order to solve the technical problems, the invention provides a system and a method for identifying the type of an output external load of a power module, which have the advantages of simple and convenient operation and improvement on the running safety of equipment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for identifying the type of an external load output by a power module comprises the following steps:
acquiring a load parameter detection instruction to control a power supply module to output a first current;
acquiring a first current value corresponding to the first current output by the power supply module and a first voltage value corresponding to the first current, and obtaining a first impedance value of a load according to the first current value and the first voltage value, and marking as Z1;
sending a sinusoidal current instruction to the power supply module to control the power supply module to output sinusoidal current and sinusoidal voltage, and collecting a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period;
obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and calculating a second impedance value of the load according to the current effective value and the voltage effective value, and marking as Z2;
and comparing the first impedance value Z1 with the second impedance value Z2, if Z2 is more than or equal to 0.9X Z1 and less than or equal to Z2 and less than or equal to 1.1X Z1, judging that the load is resistive, if Z2 is more than 1.1X Z1, judging that the load is inductive, and otherwise, repeating the calculation.
As a preferred scheme of the present invention, the obtaining of the load parameter detection instruction to control the power module to output the first current specifically includes:
sending a load parameter detection instruction to a power control board;
the power supply control board sends a constant current output instruction to the power supply module;
and the power supply module outputs a first current according to the constant current output instruction, wherein the first current is a constant current.
As a preferred scheme of the present invention, the acquiring a first current value corresponding to the first current output by the power module and a first voltage value corresponding to the first current, and obtaining a first impedance value of a load according to the first current value and the first voltage value specifically includes:
acquiring a first current value corresponding to a first current output by a power supply module and recording the first current value as I1 for storage;
acquiring a first voltage value corresponding to a first current output by a power supply module and recording the first voltage value as U1 for storage;
calculating a first impedance value of the load according to the first current value and the first voltage value according to a first calculation formula, and recording as Z1 for storage, wherein the first calculation formula is as follows: z1= U1/I1.
As a preferred aspect of the present invention, when a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage are collected in at least one cycle, the second current value is recorded as I2 Sin (ω t) and stored in the sinusoidal current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sinusoidal voltage array U2_ Sin _ table [ ].
As a preferable aspect of the present invention, when the effective current value and the effective voltage value in one cycle are obtained from the second current value and the second voltage value, the effective current value is represented as I1 RMS And calculating according to a second calculation formula, and marking the effective value of the voltage as U2 RMS And calculating according to a third calculation formula, wherein the second calculation formula is as follows:
the third calculation formula is:
as a preferable aspect of the present invention, the second impedance value of the load calculated from the current effective value and the voltage effective value is calculated according to a fourth formula, where the fourth formula is: z2= U2 RMS /I1 RMS 。
In another aspect, the present invention further provides a system for identifying the type of an external load output by a power module, including:
the first control module is used for acquiring a load parameter detection instruction to control the power supply module to output a first current;
the first acquisition module is used for acquiring a first current value corresponding to the first current output by the power supply module and a first voltage value corresponding to the first current;
the first processing module is used for obtaining a first impedance value of the load according to the first current value and the first voltage value, and the first impedance value is marked as Z1;
the second control module is used for sending a sinusoidal current instruction to the power supply module so as to control the power supply module to output sinusoidal current and sinusoidal voltage;
the second acquisition module is used for acquiring a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period;
the second processing module is used for obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and calculating a second impedance value of the load according to the current effective value and the voltage effective value, and the second impedance value is marked as Z2;
and the comparison and judgment module is used for comparing the first impedance value Z1 with the second impedance value Z2, if the first impedance value Z1 is not less than 0.9X Z1 and not more than Z2 and not more than 1.1X Z1, the load is judged to be resistive, if the first impedance value Z2 is more than 1.1X Z1, the load is judged to be inductive, and if the second impedance value Z2 is not more than 1.1X Z1, the calculation is repeated.
As a preferable aspect of the present invention, the first control module includes:
the receiving module is used for receiving a load parameter detection instruction;
the instruction sending module is used for sending a constant current output instruction to the power supply module;
and the current output control module is used for controlling the power supply module to output a first current according to the constant current output instruction, wherein the first current is a constant current.
As a preferred aspect of the present invention, the first collecting module collects a first current value, records the first current value as I1, and stores the first current value and the first voltage value as U1, and the first processing module calculates a first impedance value of the load according to a first calculation formula, and records the first impedance value as Z1, and stores the first impedance value as Z1, where the first calculation formula is: z1= U1/I1.
As a preferred embodiment of the present invention, when the second collecting module collects the second current value and the second voltage value, the second current value is recorded as I2 Sin (ω t) and stored in the sinusoidal current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sinusoidal voltage array U2_ Sin _ table [ ].
In conclusion, the invention has the following beneficial effects:
the embodiment of the invention provides a system and a method for identifying the type of an output external load of a power supply module, which can directly send a detection instruction to an XC power supply module by arranging an external upper computer, acquire a corresponding current value and a corresponding voltage value to process and calculate, can identify the type of a resistance or an inductance of the output external load, does not need to stop to disconnect an output load circuit to detect, and greatly improves the operation safety and the maintainability of equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating an identification method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an identification system according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a process of load type identification performed by the identification system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
A method for identifying a type of an external load output by a power module, as shown in fig. 1, includes:
s100, acquiring a load parameter detection instruction to control the power supply module to output a first current.
S100 specifically comprises:
s101, sending a load parameter detection instruction to a power control board, wherein the load parameter detection instruction can be sent by an upper computer or a signal controller connected with the power control board, and the power control board is used for performing centralized control on the work of a power module;
s102, the power control board sends a constant current output instruction to the power module, where the constant current output instruction is denoted as I1', and I1' =5A in this embodiment;
s103, the power supply module outputs a first current according to the constant current output instruction, wherein the first current is a constant current.
S200, acquiring a first current value corresponding to the first current output by the power supply module and a first voltage value corresponding to the first current, and obtaining a first impedance value of the load according to the first current value and the first voltage value, and marking as Z1.
S200 specifically comprises the following steps:
s201, collecting a first current value corresponding to a first current output by a power supply module and recording the first current value as I1 for storage;
s202, collecting a first voltage value corresponding to a first current output by a power supply module and recording the first voltage value as U1 for storage;
s203, calculating a first impedance value of the load according to the first current value and the first voltage value according to a first calculation formula, and storing the first impedance value as Z1, where the first calculation formula is: z1= U1/I1.
And S300, sending a sinusoidal current instruction to the power supply module to control the power supply module to output sinusoidal current and sinusoidal voltage, and collecting a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period.
The power module can output corresponding sine current and sine voltage according to the sine current instruction, and when collecting a second current value corresponding to the sine current and a second voltage value corresponding to the sine voltage in at least one period, the second current value is recorded as I2 Sin (ω t) and stored in the sine current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sine voltage array U2_ Sin _ table [ ].
And S400, obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and calculating a second impedance value of the load according to the current effective value and the voltage effective value, wherein the second impedance value is marked as Z2.
When the effective current value and the effective voltage value in one period are obtained according to the second current value and the second voltage value, the effective current value is marked as I1 RMS And calculating according to a second calculation formula, and marking the effective value of the voltage as U2 RMS And calculating according to a third calculation formula, wherein the second calculation formula is as follows:
the third calculation formula is:
calculating a second impedance value of the load according to a fourth formula by calculating the effective value of the current and the effective value of the voltage, wherein the fourth formula is as follows: z2= U2 RMS /I1 RMS 。
S500, comparing the first impedance value Z1 with the second impedance value Z2, if the first impedance value Z1 is not less than 0.9 × Z1 and not more than Z2 and not more than 1.1 × Z1, judging the load to be resistive, if the first impedance value Z1 is more than 1.1 × Z1, judging the load to be inductive, and if the load is not more than 1.1 × Z1, repeating the calculation, so that the external load can be automatically judged to be resistive or inductive by comparing the first impedance value Z1 with the second impedance value Z2.
On the other hand, the embodiment further provides a system for identifying the type of an external load output by a power module, as shown in fig. 2, including: the first control module is used for acquiring a load parameter detection instruction to control the power supply module to output a first current; the first acquisition module is used for acquiring a first current value corresponding to the first current output by the power supply module and a first voltage value corresponding to the first current; the first processing module is used for obtaining a first impedance value of the load according to the first current value and the first voltage value, and the first impedance value is marked as Z1; the second control module is used for sending a sinusoidal current instruction to the power supply module so as to control the power supply module to output sinusoidal current and sinusoidal voltage; the second acquisition module is used for acquiring a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period; the second processing module is used for obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and obtaining a second impedance value of the load by calculation according to the current effective value and the voltage effective value, and the second impedance value is marked as Z2; and the comparison and judgment module is used for comparing the first impedance value Z1 with the second impedance value Z2, if the first impedance value Z1 is not less than 0.9X Z1 and not more than Z2 and not more than 1.1X Z1, the load is judged to be resistive, if the first impedance value Z2 is more than 1.1X Z1, the load is judged to be inductive, and if the second impedance value Z1 is not more than 1.1X Z1, the calculation is repeated.
Specifically, first control module, first collection module, first processing module, the second control module, the second collection module, second processing module and comparison and judgment module all set up on power control board, power control board is connected with the power communication board, be used for carrying out the receipt and the transmission of signal, the power communication board is connected with the host computer, carry out the issue of control command and the demonstration of testing result through the host computer, the host computer still is connected with display and human-computer interaction equipment usually, load parameter detection instruction can be sent by the host computer.
The first control module includes: the receiving module is used for receiving a load parameter detection instruction; the instruction sending module is used for sending a constant current output instruction to the power supply module; and the current output control module is used for controlling the power supply module to output a first current according to the constant current output instruction, wherein the first current is a constant current.
The first acquisition module acquires a first current value, stores the first current value as I1, acquires a first voltage value, stores the first voltage value as U1, and the first processing module calculates a first impedance value of the load according to a first calculation formula, stores the first impedance value as Z1, wherein the first calculation formula is as follows: z1= U1/I1.
When the second collection module collects the second current value and the second voltage value, the second current value is recorded as I2 Sin (ω t) and stored in the sine current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sine voltage array U2_ Sin _ table [ ].
When the second processing module obtains the effective current value and the effective voltage value in one period according to the second current value and the second voltage value, the effective current value is marked as I1 RMS And calculating according to a second calculation formula, and marking the effective value of the voltage as U2 RMS And calculating according to a third calculation formula, wherein the second calculation formula is as follows:
the third calculation formula is:
and the second processing module calculates a second impedance value of the load according to a fourth formula according to the effective current value and the effective voltage value, wherein the fourth formula is as follows: z2= U2 RMS /I1 RMS 。
As shown in fig. 3, the specific detection process of the identification system according to the embodiment of the present invention is as follows: sending an external instruction to a power supply communication board by an upper computer, sending the external instruction to a power supply control board through the power supply communication board, when the external instruction is a load parameter detection instruction, firstly sending a constant current instruction to a power supply module by the power supply control board, acquiring a first current value I1 and a first voltage value U1 output by the power supply module, calculating to obtain a first impedance value Z1, storing, then sending a sinusoidal alternating current instruction to the power supply module, acquiring a second current value I2 and a second voltage value U2 output by the power supply module, calculating to obtain a second impedance value Z2, finally comparing the first impedance value Z1 with the second impedance value Z2, firstly judging whether Z1 and Z2 meet the conditions that Z1 and Z2 are equal to or more than 0.9 and equal to or less than Z2 and equal to or less than 1.1 and equal to Z1, if yes, judging that the load is resistive, sending an identification result to the power supply communication board, and uploading the identification result to the upper computer for displaying; if not, continuing to judge whether Z1 and Z2 meet Z2 > 1.1X Z1, if so, judging that the load is inductive, sending the identification result to a power supply communication board, and uploading the identification result to an upper computer for displaying; if not, the calculation is repeated once.
In conclusion, the invention has the following beneficial effects:
according to the embodiment of the invention, the external upper computer can be directly used for sending the detection instruction to the XC power supply module, and the corresponding current value and voltage value are acquired for processing and calculation, so that the resistive or inductive type of the output external load can be identified, the output load circuit does not need to be stopped and disconnected for detection, and the operation safety and the maintainability of the equipment are greatly improved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Furthermore, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required to practice the invention.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or communication connection may be an indirect coupling or communication connection between devices or units through some interfaces, and may be in a telecommunication or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention is described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for identifying the type of an external load output by a power module is characterized by comprising the following steps:
acquiring a load parameter detection instruction to control a power supply module to output a first current;
acquiring a first current value corresponding to the first current output by the power module and a first voltage value corresponding to the first current, and obtaining a first impedance value of a load according to the first current value and the first voltage value, and marking as Z1;
sending a sinusoidal current instruction to the power supply module to control the power supply module to output sinusoidal current and sinusoidal voltage, and collecting a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period;
obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and calculating a second impedance value of the load according to the current effective value and the voltage effective value, and marking as Z2;
comparing the first impedance value Z1 with the second impedance value Z2, if Z2 is more than or equal to 0.9X Z1 and less than or equal to Z2 and less than or equal to 1.1X Z1, judging that the load is resistive, if Z2 is more than 1.1X Z1, judging that the load is inductive, otherwise, repeating the calculation;
the obtaining of the load parameter detection instruction to control the power module to output the first current specifically includes:
sending a load parameter detection instruction to a power control board;
the power supply control board sends a constant current output instruction to the power supply module;
and the power supply module outputs a first current according to the constant current output instruction, wherein the first current is a constant current.
2. The method for identifying the type of the external load outputted by the power module according to claim 1, wherein the acquiring a first current value corresponding to the first current outputted by the power module and a first voltage value corresponding to the first current, and the acquiring a first impedance value of the load according to the first current value and the first voltage value specifically comprises:
acquiring a first current value corresponding to a first current output by a power supply module and recording the first current value as I1 for storage;
acquiring a first voltage value corresponding to a first current output by a power supply module and recording the first voltage value as U1 for storage;
calculating a first impedance value of the load according to the first current value and the first voltage value according to a first calculation formula, and recording as Z1 for storage, wherein the first calculation formula is as follows: z1= U1/I1.
3. The method for identifying the type of the external load outputted by the power module according to claim 2, wherein when a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage are collected in at least one cycle, the second current value is recorded as I2 Sin (ω t) and stored in the sinusoidal current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sinusoidal voltage array U2_ Sin _ table [ ].
4. The method according to claim 3, wherein when the current effective value and the voltage effective value in one period are obtained according to the second current value and the second voltage value, the current effective value is marked as I1 RMS And calculating according to a second calculation formula, and recording the effective value of the voltage as U2 RMS And calculating according to a third calculation formula, wherein the second calculation formula is as follows:
the third calculation formula is:
5. the method for identifying the type of the external load output by the power module according to claim 4, wherein the second impedance value of the load calculated according to the current effective value and the voltage effective value is calculated according to a fourth formula, where the fourth formula is: z2= U2 RMS /I 1 RMS 。
6. The utility model provides a power module output external load type identification system which characterized in that includes:
the first control module is used for acquiring a load parameter detection instruction to control the power supply module to output a first current;
the first acquisition module is used for acquiring a first current value corresponding to the first current output by the power supply module and a first voltage value corresponding to the first current;
the first processing module is used for obtaining a first impedance value of the load according to the first current value and the first voltage value, and the first impedance value is marked as Z1;
the second control module is used for sending a sinusoidal current instruction to the power supply module so as to control the power supply module to output sinusoidal current and sinusoidal voltage;
the second acquisition module is used for acquiring a second current value corresponding to the sinusoidal current and a second voltage value corresponding to the sinusoidal voltage in at least one period;
the second processing module is used for obtaining a current effective value and a voltage effective value in one period according to the second current value and the second voltage value, and calculating a second impedance value of the load according to the current effective value and the voltage effective value, and the second impedance value is marked as Z2;
the comparison and judgment module is used for comparing the first impedance value Z1 with the second impedance value Z2, if the first impedance value Z1 is not less than 0.9X Z1 and not more than Z2 and not more than 1.1X Z1, the load is judged to be resistive, if the first impedance value Z2 is more than 1.1X Z1, the load is judged to be inductive, and if the second impedance value Z2 is not more than 1.1X Z1, the calculation is repeated;
wherein the first control module comprises:
the receiving module is used for receiving a load parameter detection instruction;
the instruction sending module is used for sending a constant current output instruction to the power supply module;
and the current output control module is used for controlling the power supply module to output a first current according to the constant current output instruction, wherein the first current is a constant current.
7. The system for identifying the type of the power module output external load according to claim 5, wherein the first collecting module collects a first current value, records the first current value as I1, stores the first current value as U1, and stores the first voltage value as U1, and the first processing module calculates a first impedance value of the load according to a first calculation formula, and records the first impedance value as Z1, wherein the first calculation formula is: z1= U1/I1.
8. The system according to claim 5, wherein when the second collection module collects a second current value and a second voltage value, the second current value is recorded as I2 Sin (ω t) and stored in the sinusoidal current array I2_ Sin _ table [ ], and the second voltage value is recorded as U2 Sin (ω t) and stored in the sinusoidal voltage array U2_ Sin _ table [ ].
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