CN214278398U - Magnetic powder core loss tester - Google Patents
Magnetic powder core loss tester Download PDFInfo
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- CN214278398U CN214278398U CN202120438840.1U CN202120438840U CN214278398U CN 214278398 U CN214278398 U CN 214278398U CN 202120438840 U CN202120438840 U CN 202120438840U CN 214278398 U CN214278398 U CN 214278398U
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Abstract
The utility model discloses a magnetic powder core loss tester, which comprises a shell and a hardware circuit arranged inside the shell, wherein the hardware circuit comprises a power supply source and a test circuit, and the power supply source is used for supplying power to the test circuit; the test circuit comprises a frequency division module, an amplification module, a power supply module and a conversion module, wherein the frequency division module is used for obtaining a frequency signal of the magnetic powder core, the output end of the frequency division module is connected with the input end of the amplification module, the amplification module is used for carrying out secondary amplification on the signal, the output end of the amplification module is connected with the power supply module, the power supply module is used for providing an excitation signal for the magnetic powder core, and the output end of the power supply module is connected with the conversion module. The utility model discloses a design of each module can carry out the accuracy to the resistivity of magnetic powder core and detect to learn its eddy current loss, in order to obtain the loss of magnetic powder core.
Description
Technical Field
The utility model relates to a magnetic powder core detection area especially relates to a magnetic powder core loss tester.
Background
The modern communication technology and computer industry which are developed rapidly have higher and higher requirements on the performance of the magnetic powder core, and the demand is also higher and higher. The magnetic powder core is widely used in the technologies of telecommunication, radar, television and the like as an inductive filter, a frequency modulation choke coil and a main vibration core of a switching power supply. The magnetic permeability and loss of the magnetic powder core are important physical parameters for measuring the magnetic performance. It is very important to detect the loss of the magnetic powder core in time in order to reduce the loss of the magnetic powder core. As described in the study on reduction of the loss of the soft magnetic sendust core in volume 6 of the university of northeast, volume 30, the loss of the magnetic powder core mainly consists of hysteresis loss and eddy current loss, the hysteresis loss depends on the metal material of the magnetic powder core, and the eddy current loss depends on the resistivity of the magnetic powder core. The loss caused by the metal material is a fixed value and linearly changes along with the use time and the like. The resistivity is a variable value and changes nonlinearly with the use of the magnetic powder core, so that the loss of the magnetic powder core can be accurately known only by accurately measuring the resistivity in the application of the magnetic powder core.
Disclosure of Invention
The utility model aims to provide a: in order to overcome the defects, the magnetic powder core loss tester is provided to improve the accuracy of magnetic powder core loss measurement.
In order to achieve the above purpose, the technical scheme of the utility model is that: a magnetic powder core loss tester comprises a shell and a hardware circuit arranged in the shell, wherein the hardware circuit comprises a power supply source and a test circuit, and the power supply source is used for supplying power to the test circuit; the test circuit comprises a frequency division module, an amplification module, a power supply module and a conversion module, wherein the frequency division module is used for obtaining a frequency signal of the magnetic powder core, the output end of the frequency division module is connected with the input end of the amplification module, the amplification module is used for carrying out secondary amplification on the signal, the output end of the amplification module is connected with the power supply module, the power supply module is used for providing an excitation signal for the magnetic powder core, and the output end of the power supply module is connected with the conversion module.
Further, the frequency division module comprises a capacitor C1, resistors R1-R2, inverters U1-U2 and a processor U3, the other end of the capacitor C1 is connected with the magnetic powder core, one end of the capacitor C1 is connected with one ends of the resistors R1-R2 and then connected with the input end of the inverter U1, the other end of the resistor R1 is connected to the output end of the inverter U1, the other end of the resistor R2 is connected to the input end of the inverter U2, the output end of the inverter U2 is connected to a pin 3 of the processor U3, a pin 1 of the processor U3 is connected to a pin 4 of the processor U3 and then connected with an external voltage, a pin 2 of the processor U3 is connected with the amplification module.
Further, the amplifying module comprises resistors R3-R7, capacitors C2-C3, diodes D1-D2, an amplifier U4 and transistors Q1-Q2, one end of a resistor R3 is connected with the output end of the frequency dividing module, the other end of the resistor R3 is connected to one end of a capacitor C2, the other end of the capacitor C2 is connected to the inverting input end of the amplifier U4 and one ends of the resistor R5 and the capacitor C3, the forward input end of the amplifier U4 is connected with one end of a resistor R4, and the other end of the resistor R4 is grounded; the output end of the amplifier U4 is connected to the cathode of the diode D1 and the anode of the diode D2, the anode of the diode D1 is connected to one end of the resistor R6 and the base of the transistor Q1, the cathode of the diode D2 is connected to one end of the resistor R7 and the base of the transistor Q2, the collector of the transistor Q1 is connected to the other end of the resistor R6 and then grounded, the emitter of the transistor Q2 is connected to the other end of the resistor R7 and then grounded, the emitter of the transistor Q1 is connected to the collector of the transistor Q2, and the other ends of the resistor R5 and the capacitor C3 are connected to the emitter of the transistor Q1.
Further, the power module comprises transformers T1-T2, a primary coil of the transformer T1 is connected with the amplifying module, a secondary coil of the transformer T1 is connected with the magnetic powder core to be tested and used for providing excitation power for the magnetic powder core to be tested, a primary coil of the transformer T2 is connected with the magnetic powder core to be tested and used for outputting a signal of the magnetic powder core to the converting module, and a secondary coil of the transformer T2 is connected with the converting module.
Further, the conversion module comprises a capacitor C4, resistors R8-R14 and processors U5-U6, a forward input end of the processor U5 and one end of a resistor R8 are connected with a secondary coil of the transformer T2, the other end of the resistor R8 is connected with a forward input end of the processor U5, a reverse input end of the processor U5 is connected with one ends of the resistors R9-R10, the other end of the resistor R9 is grounded, the other end of the resistor R10 is connected with an output end of the processor U5 and one end of the resistor R14, the other end of the resistor R14 is connected with a pin 5 of the processor U6, a pin 1 and a pin 3 of the processor U6 are connected with an external voltage, a pin 4 of the processor U6 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with an adjustable end of the resistor R13, two ends of the resistor R13 are respectively connected with the external voltage, a pin 6 of the processor U6 is connected with one end of the adjustable resistor R11, and the other end of the processor U11 is connected with a pin 6, wherein the capacitor C4 is also connected between pin 6 and pin 7 of the processor U6.
Since the proposal is adopted, the beneficial effects of the utility model reside in that: the utility model provides a prior art not enough, the utility model provides a magnetic powder core loss tester, its benefit is:
(1) the utility model discloses a design of each module can carry out the accuracy to the resistivity of magnetic powder core and detect to learn its eddy current loss, in order to obtain the loss of magnetic powder core.
(2) The utility model discloses an amplifier circuit can carry out the secondary to the signal and enlarge, avoids the signal at the amplification process, can superpose interference signal, and the final test result of interference leads to the loss test inaccurate.
(3) The utility model discloses treater U6 is connected with resistance R12 and resistance R13 among the conversion module, and it can reduce the nonlinear error that treater U6 during operation brought, avoids the output result to have the mistake to further improve resistivity measurement's precision.
Drawings
Fig. 1 is a circuit diagram of the frequency division module of the present invention.
Fig. 2 is a circuit diagram of the amplifying module of the present invention.
Fig. 3 is a circuit diagram of the conversion module of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply 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," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "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 in specific cases to those skilled in the art.
Examples
As shown in fig. 1-3, a magnetic powder core loss tester comprises a housing and a hardware circuit arranged inside the housing, wherein the hardware circuit comprises a power supply and a test circuit, and the test circuit comprises a frequency division module, an amplification module, a power supply module and a conversion module. The power supply source is used for supplying power for the test circuit so as to realize the power supply of the whole tester, and the model is GH200-V2 SXX.
The frequency division module comprises a capacitor C1, resistors R1-R2, inverters U1-U2 and a processor U3, the types of the inverters U1-U2 are CD40106, and the type of the processor U3 is CD 4516. The other end of the capacitor C1 is connected with the magnetic powder core, one end of the capacitor C1 is connected with one end of the resistors R1-R2 and then connected with the input end of the inverter U1, the other end of the resistor R1 is connected with the output end of the inverter U1, the other end of the resistor R2 is connected with the input end of the inverter U2, the output end of the inverter U2 is connected to a pin 3 of the processor U3, a pin 1 of the processor U3 is connected to a pin 4 of the processor U3 and then connected with external voltage, a pin 2 of the processor U3 is grounded, and a pin 5 of the processor U3 serves as the output end of the circuit and is connected with the amplification module.
The amplifying module comprises resistors R3-R7, capacitors C2-C3, diodes D1-D2, an amplifier U4 and transistors Q1-Q2, and the type of an amplifier U4 is HA 2680. One end of the resistor R3 is used as the input end of the circuit and is connected with the output end of the frequency division module circuit, the other end of the resistor R3 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the inverting input end of the amplifier U4 and one ends of the resistor R5 and the capacitor C3, the positive input end of the amplifier U4 is connected with one end of the resistor R4, and the other end of the resistor R4 is grounded; the output end of the amplifier U4 is connected to the cathode of the diode D1 and the anode of the diode D2, the anode of the diode D1 is connected to one end of the resistor R6 and the base of the transistor Q1, the cathode of the diode D2 is connected to one end of the resistor R7 and the base of the transistor Q2, the collector of the transistor Q1 is connected to the other end of the resistor R6 and then grounded, the emitter of the transistor Q2 is connected to the other end of the resistor R7 and then grounded, the emitter of the transistor Q1 is connected to the collector of the transistor Q2, the other ends of the resistor R5 and the capacitor C3 are connected to the emitter of the transistor Q1, and the emitter of the transistor Q1 is used as the output end of the circuit to output signals.
The power supply module comprises transformers T1-T2, a primary coil of the transformer T1 is connected with the amplification module, a secondary coil of the transformer T2 is connected with the magnetic powder core to be tested and used for providing an excitation power supply for the magnetic powder core to be tested, the primary coil of the transformer T2 is connected with the magnetic powder core to be tested and used for outputting a signal of the magnetic powder core to the conversion module, and a secondary coil of the transformer T2 is connected with the conversion module.
The conversion module comprises a capacitor C4, resistors R8-R14 and processors U5-U6, wherein the processor U5 adopts CA series, and the processor U6 is AD637 in model number. The positive input end of the processor U5 and one end of a resistor R8 are connected with a secondary coil of a transformer T2, the other end of the resistor R8 is connected with the positive input end of a processor U5, the reverse input end of the processor U5 is connected with one ends of resistors R9-R10, the other end of the resistor R9 is grounded, the other end of the resistor R10 is connected with the output end of the processor U5 and one end of a resistor R14, the other end of the resistor R14 is connected with a pin 5 of a processor U6, a pin 1 and a pin 3 of the processor U6 are connected with an external voltage, a pin 4 thereof is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an adjustable end of a resistor R13, two ends of the resistor R13 are respectively connected with the external voltage, a pin 6 of a processor U6 is connected with one end of a resistor R11, the adjustable end of the resistor R11 and the other end thereof is connected with a pin 6 of the processor U6, wherein a capacitor C4 is further connected between the pin 6 and the pin 6 of the processor U6, and pin 6 outputs the measurement signal as an output, with pin 7 being the reference signal value.
Specifically, since the loss of the magnetic powder core mainly consists of hysteresis loss and eddy current loss, the hysteresis loss is determined by the metal material of the magnetic powder core and is a constant value, and the eddy current loss is determined by the resistivity of the magnetic powder core, which changes in the application of the magnetic powder core, it is very important to test the resistivity of the magnetic powder core in order to test the loss change of the magnetic powder core. The frequency dividing module is used for obtaining a frequency signal after the magnetic powder core is electrified, wherein the capacitor C1 is arranged for enabling a required specific frequency signal to pass through, the capacitor C1 is connected with a circuit formed by a resistor and an inverter, and the frequency dividing circuit can obtain signals with different frequencies by adjusting the resistance value of the resistor. Wherein the processor U3 is configured to act as a frequency divider to facilitate the dune process to obtain a signal of a desired frequency. Then, the signal output by the frequency division module is transmitted to the amplification module so as to amplify the signal, so that the subsequent module can acquire and process the signal conveniently. That is, a signal is input to the module through the resistor R3, and the capacitor C2 connected to the resistor R3 is used to filter the input signal. The filtered signals are fed into an amplifier U4 to carry out primary amplification of the signals, the signals output by the amplifier U4 are transmitted to diodes D1-D2, transistors Q1-Q2 are respectively connected with the two diodes, and can form a push-pull amplification circuit, namely, the signals passing through an amplifier U4 are amplified for the second time, so that the signals are prevented from being directly and completely amplified through the amplifier U4, and the output signals are prevented from being interfered due to working noise of the amplifier U4. Namely the utility model discloses an amplifier U4 once enlargies the back, and its working noise is less, avoids interfering signal stack to output signal in, and the rethread transistor carries out the secondary and enlargies, can realize the enlargiing of signal when realizing the low noise. The output signal is connected with a transformer T1, so that the transformer T1 provides an excitation signal for a magnetic powder core to be measured, meanwhile, the transformer T2 is used for outputting the acquired magnetic powder core signal to a conversion module to obtain a final measured value, namely, the signal is introduced into a processor U6 after passing through a processor U5, the processor U6 is a converter, the signal input by the transformer T2 can be converted into an effective value to be output, namely, the value output by a pin 6 of the converter, and the connected resistor R12 and the resistor R13 can reduce a nonlinear error caused by the operation of the processor U6, so that the measurement accuracy is further improved. Then the signal value U1 output from pin 6/the reference value U2 output from pin 7 can obtain the resistivity of the magnetic powder core, and thus the loss of the magnetic powder core.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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 (5)
1. A magnetic powder core loss tester is characterized in that: the testing device comprises a shell and a hardware circuit arranged in the shell, wherein the hardware circuit comprises a power supply source and a testing circuit, and the power supply source is used for supplying power to the testing circuit; the test circuit comprises a frequency division module, an amplification module, a power supply module and a conversion module, wherein the frequency division module is used for obtaining a frequency signal of the magnetic powder core, the output end of the frequency division module is connected with the input end of the amplification module, the amplification module is used for carrying out secondary amplification on the signal, the output end of the amplification module is connected with the power supply module, the power supply module is used for providing an excitation signal for the magnetic powder core, and the output end of the power supply module is connected with the conversion module.
2. The magnetic powder core loss tester of claim 1, wherein: the frequency division module comprises a capacitor C1, resistors R1-R2, inverters U1-U2 and a processor U3, the other end of the capacitor C1 is connected with the magnetic powder core, one end of the capacitor C1 is connected with one ends of the resistors R1-R2 and then connected with the input end of the inverter U1, the other end of the resistor R1 is connected to the output end of the inverter U1, the other end of the resistor R2 is connected to the input end of the inverter U2, the output end of the inverter U2 is connected to a pin 3 of the processor U3, a pin 1 of the processor U3 is connected to a pin 4 of the processor U3 and then connected with external voltage, a pin 2 of the processor U3 is connected with the amplification module, and a pin 5 of the processor U3 is connected with the amplification module.
3. The magnetic powder core loss tester of claim 2, wherein: the amplification module comprises resistors R3-R7, capacitors C2-C3, diodes D1-D2, an amplifier U4 and transistors Q1-Q2, one end of a resistor R3 is connected with the output end of the frequency division module, the other end of the resistor R3 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the inverting input end of the amplifier U4 and one ends of the resistor R5 and the capacitor C3, the forward input end of the amplifier U4 is connected with one end of the resistor R4, and the other end of the resistor R4 is grounded; the output end of the amplifier U4 is connected to the cathode of the diode D1 and the anode of the diode D2, the anode of the diode D1 is connected to one end of the resistor R6 and the base of the transistor Q1, the cathode of the diode D2 is connected to one end of the resistor R7 and the base of the transistor Q2, the collector of the transistor Q1 is connected to the other end of the resistor R6 and then grounded, the emitter of the transistor Q2 is connected to the other end of the resistor R7 and then grounded, the emitter of the transistor Q1 is connected to the collector of the transistor Q2, and the other ends of the resistor R5 and the capacitor C3 are connected to the emitter of the transistor Q1.
4. The magnetic powder core loss tester of claim 1, wherein: the power supply module comprises transformers T1-T2, a primary coil of the transformer T1 is connected with the amplification module, a secondary coil of the transformer T2 is connected with the magnetic powder core to be tested and used for providing an excitation power supply for the magnetic powder core to be tested, the primary coil of the transformer T2 is connected with the magnetic powder core to be tested and used for outputting a signal of the magnetic powder core to the conversion module, and a secondary coil of the transformer T2 is connected with the conversion module.
5. The magnetic powder core loss tester of claim 4, wherein: the conversion module comprises a capacitor C4, resistors R8-R14 and processors U5-U6, a forward input end of the processor U5 and one end of a resistor R8 are connected with the secondary coil of the transformer T2, the other end of the resistor R8 is connected with a forward input end of the processor U5, a reverse input end of the processor U5 is connected with one ends of the resistors R9-R10, the other end of the resistor R9 is grounded, the other end of the resistor R10 is connected with an output end of the processor U5 and then one end of the resistor R5, the other end of the resistor R5 is connected with a pin 5 of the processor U5, the pin 1 and the pin 3 of the processor U5 are connected with external voltage, the pin 4 of the processor U5 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with an adjustable end of the resistor R5, the two ends of the resistor R5 are respectively connected with the external voltage, the pin 6 of the processor U5 is connected with one end of the adjustable terminal of the processor U5, wherein the capacitor C4 is also connected between pin 6 and pin 7 of the processor U6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120438840.1U CN214278398U (en) | 2021-03-01 | 2021-03-01 | Magnetic powder core loss tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120438840.1U CN214278398U (en) | 2021-03-01 | 2021-03-01 | Magnetic powder core loss tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214278398U true CN214278398U (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120438840.1U Active CN214278398U (en) | 2021-03-01 | 2021-03-01 | Magnetic powder core loss tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214278398U (en) |
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2021
- 2021-03-01 CN CN202120438840.1U patent/CN214278398U/en active Active
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