CN112230050B - Improved metal soft magnetic power loss measurement device and working method thereof - Google Patents
Improved metal soft magnetic power loss measurement device and working method thereof Download PDFInfo
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- CN112230050B CN112230050B CN202011091176.4A CN202011091176A CN112230050B CN 112230050 B CN112230050 B CN 112230050B CN 202011091176 A CN202011091176 A CN 202011091176A CN 112230050 B CN112230050 B CN 112230050B
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- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 229910001004 magnetic alloy Inorganic materials 0.000 claims abstract description 20
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 145
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a power loss measurement technology of a metal soft magnetic alloy magnetic core product, in particular to a metal soft magnetic power loss measurement improvement device and a working method thereof, belonging to the technical field of measurement of metal soft magnetic alloy magnetic core products, wherein the metal soft magnetic power loss measurement improvement device and the working method thereof comprise the following steps: the system comprises a signal source, a power amplifier, a variable capacitance box, an oscilloscope, a current sampling module, a current transformer and a power meter; according to the invention, by introducing the variable capacitance box and the current transformer, improvement is performed on a circuit, and accurate data is obtained, so that accurate soft magnetic alloy product power loss is obtained; the current transformer is connected in the parallel resonant circuit, so that the accurate current of the resonant internal circuit can be obtained, the direct current resistance R wound on the metal soft magnetic alloy product wire is measured in a static state, the loss value of the wire can be obtained as known by P=I 2*R, and the loss value of the real soft magnetic alloy product is obtained by subtracting the line loss from the total loss.
Description
Technical Field
The invention relates to a power loss measurement technology of a metal soft magnetic alloy magnetic core product, belongs to the technical field of measurement of metal soft magnetic alloy magnetic core products, and particularly relates to an improved device for measuring metal soft magnetic power loss and a working method thereof.
Background
Soft magnetic alloys are a class of alloys that have high magnetic permeability and low coercivity in weak magnetic fields. The alloy is widely applied to the radio and electronic industry, precise instruments and meters, remote control and automatic control systems, is mainly used for energy conversion and information processing in two aspects, and is an important material in national economy.
The power loss measurement of the current metal magnetically soft alloy core is performed by referring to the principle of fig. 1: the signal source generates a sine wave signal with a certain frequency, the sine wave signal is amplified by the power amplifier, then the tested metal soft magnetic alloy magnetic core product is wound into a certain number of turns to be connected into a loop, and the power meter directly converts the voltage and the current of the tested object into power values after sampling the voltage and the current of the tested object, namely the power loss value of the tested product.
However, when the power loss measurement of the metal magnetically soft alloy magnetic core in the prior art works, whether the phase of the sampling voltage and the phase of the sampling current are the same at the moment cannot be accurately detected, so that the error exists in the measured value, and the temperature rise is large for the measured value when the product is measured due to the fact that the loop current is too large when the capacitor is not arranged at the same year.
Disclosure of Invention
The invention aims to: an improved device for measuring metal soft magnetic power loss and a working method thereof are provided to solve the problems.
The technical scheme is as follows: a metallic soft magnetic power loss measurement improvement apparatus comprising:
the signal source is used for generating a sine wave signal with a certain frequency;
the power amplifier is used for amplifying the power of the input sine wave signal so as to ensure the strength and stability of the sine wave signal;
a variable capacitor box for adjusting a proper capacitance value so that the power factor PF value of the loop converges to 1;
the current transformer is used for detecting and obtaining accurate current of the resonant internal loop;
the oscilloscope is used for measuring and obtaining the waveform of the accurate current of the resonant internal loop and observing;
and the power meter is used for detecting the power loss of the metal soft magnetic alloy magnetic core product.
Preferably, the power amplifier includes: resistor R1, resistor R2, capacitor C1, resistor R3, capacitor C2, resistor R4, amplifier U1A, transistor Q1, capacitor C3, capacitor C6, capacitor C5, capacitor C4, voltage regulator U2, voltage regulator U3, transistor Q2, resistor R6, transistor Q3, resistor R5, resistor R7, resistor R8, polarity capacitor C7, transistor Q8, transistor Q4, capacitor C9, resistor R11, resistor R10, capacitor C8, diode D1, diode D2, resistor R9, resistor R12, resistor R13, transistor Q5, transistor Q6, resistor R14, transistor Q7, capacitor C10, resistor R16, resistor R17, transistor Q9, resistor R17, resistor R14, resistor R15, transistor Q6, transistor Q10, resistor R18, inductor L1, capacitor C11, resistor R19;
one end of the resistor R2 is connected with one end of the capacitor C1 and inputs signals, the other end of the resistor R2 is grounded, the other end of the resistor C1 is connected with a 3-pin of the amplifier U1A at the same time, the other end of the resistor R1 is grounded, a 2-pin of the amplifier U1A is connected with one end of the resistor R3 at the same time, one end of the resistor R4 is connected with one end of the capacitor C2, the other end of the resistor R3 is grounded, a 4-pin of the amplifier U1A is connected with one end of the capacitor C6 and the 3-pin of the voltage regulator U3 at the same time, a 1-pin of the amplifier U1A is connected with one end of the capacitor C1 at the same time, a 2-pin of the amplifier U3 is connected with one end of the resistor C5 at the same time, a 2-pin of the amplifier U8 is connected with one end of the resistor C1 and the resistor C6 at the same time, a 2-pin of the amplifier U8 is connected with the other end of the resistor C1 and the resistor C3 at the same time, a 2-pin of the amplifier U3 is connected with the base of the resistor Q1 and the resistor Q3 at the same time, a 2-pin of the voltage regulator Q3 is connected with the other end of the resistor Q1 and the resistor Q5 at the same time, the 3 is connected with the other end of the resistor Q3 is connected with the resistor C5 at the end of the resistor C3 and the resistor C5 at the end of the resistor is connected with the end of the 3, the 3-pin is connected with the 3 at the end of the resistor 3 and the resistor is connected with the 3 and the end of the 3. The other end of the resistor R8 is connected with one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the triode Q3 is connected with the other end of the resistor R5, the base of the triode Q3 is simultaneously connected with the base of the triode Q4, one end of the resistor R12, the positive pole of the diode D1 and one end of the capacitor C8, the emitter of the triode Q4 is connected with one end of the resistor R9, the collector of the triode Q4 is simultaneously connected with one end of the resistor R10, the other end of the capacitor C8, the emitter of the triode Q5, one end of the resistor R10 and the base of the triode Q7, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and one end of the resistor R11, the other end of the triode Q8, the other end of the resistor R5 and the triode Q6 are simultaneously connected with the other end of the resistor R6, the voltage of the resistor R6 and the other end of the resistor R6 is simultaneously connected with the other end of the resistor R6, the resistor R13 and the other end of the resistor R6 and the resistor R6 are simultaneously connected with the other end of the resistor R6 and the resistor R13, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and the other end of the resistor R12 and the resistor R11, the emitter of the triode Q10 is connected with one end of the resistor R15, the collector of the triode Q7 is simultaneously connected with the other end of the capacitor C10, one end of the resistor R16 and one end of the triode Q9, the emitter of the triode Q9 is simultaneously connected with one end of the resistor R17, the other end of the resistor R16 is simultaneously connected with the other end of the resistor R9 and the other end of the resistor R17 and inputs voltage, the other end of the resistor R7 is simultaneously connected with the collector of the triode Q7 and the other end of the resistor R14, several points of the triode Q7 are simultaneously connected with the other end of the resistor R14, the other end of the resistor R15, the collector of the triode Q8 and one end of the inductor L1, one end of the inductor L1 is simultaneously connected with one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2, the other end of the inductor L1 is simultaneously connected with the other end of the resistor R18 and one end of the capacitor C11, and the other end of the capacitor C11 is connected with the resistor R19 and the other end of the resistor R19 is connected with the ground.
Preferably, the current transformer comprises a current sampling module; the current sampling module comprises a resistor R21, a capacitor C12, an amplifier U4A, an amplifier U4B, a resistor R20, a linear photoelectric coupler U5, a resistor R22, a resistor R23, a resistor R24, a capacitor C13 and a capacitor C14;
the No. 3 pin of the amplifier U4A is simultaneously connected with one end of the resistor R21, one end of the capacitor C12 and the No. 1 pin of the linear photoelectric coupler U4A, the No. 2 pin and the No. 4 pin of the amplifier U4A are simultaneously connected with the other end of the resistor R1 and the No. 2 pin of the linear photoelectric coupler U5 in a grounding manner, voltages are input to two ends of the resistor R1, the No. 1 pin of the amplifier U4A is simultaneously connected with one end of the resistor R20 and the other end of the capacitor C12, the No. 4 pin of the amplifier U4A is simultaneously connected with the No. 5 pin of the linear photoelectric coupler U5 and inputs voltages, the No. 6 pin of the linear photoelectric coupler U5 is simultaneously connected with the No. 5 pin of the amplifier U4B, one end of the capacitor C13 and one end of the resistor R23, the No. 3 pin of the photoelectric coupler U5 is simultaneously connected with the one end of the resistor R22, the other end of the resistor U4B 4 is simultaneously connected with the other end of the resistor R24, the other end of the resistor R24 is simultaneously connected with the other end of the resistor R24, the resistor C4B and the other end of the resistor R20, and the other end of the resistor C24 is simultaneously connected with the resistor C24.
Preferably, two ends of a measured sample in the loop are connected with a variable capacitance box in parallel to form an LC parallel resonant loop; the LC parallel resonant tank includes: variable capacitance box A1, inductance L3, inductance L2, capacitance C15, measured sample R25, capacitance C15, capacitance C16; one end of the inductor L3 is connected with one end of the capacitor C16 to input voltage, the other end of the inductor L3 is connected with one end of the inductor L2 and one end of the capacitor C15 at the same time, the other end of the inductor L2 is connected with one end of the tested sample R25 to output voltage, the other end of the capacitor C16 is connected with the other end of the capacitor C15 and the other end of the tested sample R25 to output voltage at the same time, the variable capacitor box A1 is connected with the capacitor C15, and a control end of the variable capacitor box A1 inputs a control signal.
Preferably, the model of the power amplifier is 1140LA, and the rated working power of the power amplifier is 1000W; the model of the power meter is CH2335; the model of the signal source is TEKMD03AFG; the model of the linear photocoupler U5 is HCNR200.
Preferably, the variable capacitance box is internally composed of a plurality of capacitors, each capacitor is connected with a switching tube, and the capacitance value of the variable capacitance box is controlled by checking the waveform of the sampling current at the moment.
According to the working method of the metal soft magnetic power loss measurement improving device, when metal soft magnetic power loss measurement is carried out, a variable capacitance box is added for adjusting a proper capacitance value, so that the power factor PF value of a loop is infinitely close to 1; simultaneously, a current transformer is connected to obtain an accurate current value, so that a real metal soft magnetic power loss value is obtained; the method comprises the following specific steps:
step 1, starting a working device, so that a signal source generates a sine wave signal with a certain frequency and transmits the sine wave signal to a power amplifier;
step 2, the amplified sine wave signal, the tested metal soft magnet and the power meter form a loss detection loop;
step 3, connecting two ends of the tested metal soft magnet in parallel with a variable capacitance box in the loss detection loop to form an LC parallel resonance circuit;
step 4, adjusting the capacitance value of the variable capacitance box;
step 41, initializing capacitance values of all capacitors in the variable capacitance box;
step 42, converting the control logic of the switching tube connected with each capacitor in the variable capacitance box into capacitance value control;
step 43, the current transformer and the oscilloscope work;
step 44, the current sampling module works to collect current signals;
step 45, transmitting a current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonant internal loop and observing;
step 46, the controller calculates the phase difference between the current signal and the voltage signal;
step 47, outputting a control signal according to the magnitude of the phase difference at the moment to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is smaller than 1, the power factor PF value of the loop is converged to 1, namely, the parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, and the current is minimum, and then a current signal and a voltage signal are output;
and 5, inputting the current signal and the voltage signal into a power meter to obtain the accurate loss value of the measured metal soft magnetic at the moment.
Preferably, a current transformer is connected in the parallel resonant circuit, so that the accurate current of the resonant internal circuit can be obtained, the direct current resistance R wound on the metal soft magnetic alloy product wire is measured in a static state, the loss value of the wire can be obtained as known by P=I 2*R, and the loss value of the real soft magnetic alloy product is obtained by subtracting the line loss from the total loss.
Preferably, the capacitance value of each capacitor in the variable capacitance box can be adjusted, and the control precision of the capacitance value of the variable capacitance box depends on the capacitance value of each small capacitor connected in parallel; when the capacitance value of each small capacitor is smaller and the parallel connection number of the small capacitors is larger, the capacitance value variation range and the precision of the variable capacitor group are higher.
The beneficial effects are that: by improving and innovating the figure 1, the schematic diagram of the figure 2 is obtained, a variable capacitance box and a current transformer are introduced, the circuit is improved, accurate data are obtained, and therefore the accurate soft magnetic alloy product power loss is obtained; the two ends of a tested sample (which can be understood as an inductive load) in the loop are connected with a variable capacitance box in parallel to form LC parallel resonance, the power factor PF value of the loop is converged to 1 by adjusting a proper capacitance value, namely, the parallel resonance point is reached, the total impedance of the whole loop is maximum, the current is minimum, the sampling voltage and the sampling current of an input power meter are the same in phase, no phase difference exists, and no error exists, so that the power of a power amplifier can be maximally transmitted, and meanwhile, the problem that the temperature rise is large to a measured value when the product is measured due to the fact that the loop current is overlarge when the capacitor is not present can be reduced, so that the error is larger; the current transformer is connected in the parallel resonant circuit, so that the accurate current of the resonant internal circuit can be obtained, the direct current resistance R wound on the metal soft magnetic alloy product wire is measured in a static state, the loss value of the wire can be obtained as known by P=I 2*R, and the loss value of the real soft magnetic alloy product is obtained by subtracting the line loss from the total loss.
Drawings
Fig. 1 is a schematic diagram of a prior art metallic soft magnetic power loss measurement device.
Fig. 2 is a schematic diagram of a metal soft magnetic power loss measuring apparatus of the present invention.
Fig. 3 is a flow chart of the operation of the present invention.
Fig. 4 is a diagram of an LC parallel resonant circuit of the present invention.
Fig. 5 is a circuit diagram of a power amplifier of the present invention.
Fig. 6 is a circuit diagram of a current sampling module of the present invention.
Detailed Description
As shown in fig. 2, in this embodiment, a metal soft magnetic power loss measurement improvement device includes: the system comprises a signal source, a power amplifier, a variable capacitance box, an oscilloscope, a current sampling module, a current transformer and a power meter.
In a further embodiment, the power amplifier comprises: resistor R1, resistor R2, capacitor C1, resistor R3, capacitor C2, resistor R4, amplifier U1A, transistor Q1, capacitor C3, capacitor C6, capacitor C5, capacitor C4, voltage regulator U2, voltage regulator U3, transistor Q2, resistor R6, transistor Q3, resistor R5, resistor R7, resistor R8, polarity capacitor C7, transistor Q8, transistor Q4, capacitor C9, resistor R11, resistor R10, capacitor C8, diode D1, diode D2, resistor R9, resistor R12, resistor R13, transistor Q5, transistor Q6, resistor R14, transistor Q7, capacitor C10, resistor R16, resistor R17, transistor Q9, resistor R17, resistor R14, resistor R15, transistor Q6, transistor Q10, resistor R18, inductor L1, capacitor C11, resistor R19.
In a further embodiment, one end of the resistor R2 is connected to one end of the capacitor C1 and inputs a signal, the other end of the resistor R2 is grounded, the other end of the resistor C1 is simultaneously connected to pin 3 of the transistor Q1, pin 2 of the transistor U3 is simultaneously connected to one end of the capacitor C6 and grounded, pin 2 of the resistor U1A is simultaneously connected to one end of the resistor R3, one end of the resistor R4 and one end of the capacitor C2, the other end of the resistor R3 is simultaneously grounded, pin 4 of the amplifier U1A is simultaneously connected to one end of the capacitor C6 and pin 3 of the transistor Q3, pin 1 of the amplifier U1A is simultaneously connected to one end of the capacitor C6 and one end of the capacitor C5 and is grounded, pin 1 of the transistor U3 is simultaneously connected to one end of the resistor C5 and one end of the resistor C5, pin 2 of the transistor Q6 is simultaneously connected to one end of the resistor C1 and one end of the resistor C8, pin 2 of the transistor Q6 is simultaneously connected to one end of the resistor C6 and one end of the transistor Q3 is simultaneously connected to one end of the resistor C6, pin 3 of the transistor Q3 is simultaneously connected to the base of the transistor Q3, and the base of the transistor Q3 is simultaneously connected to the resistor Q3, the other end of the resistor R8 is connected with one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the triode Q3 is connected with the other end of the resistor R5, the base of the triode Q3 is simultaneously connected with the base of the triode Q4, one end of the resistor R12, the positive pole of the diode D1 and one end of the capacitor C8, the emitter of the triode Q4 is connected with one end of the resistor R9, the collector of the triode Q4 is simultaneously connected with one end of the resistor R10, the other end of the capacitor C8, the emitter of the triode Q5, one end of the resistor R10 and the base of the triode Q7, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and one end of the resistor R11, the other end of the triode Q8, the other end of the resistor R5 and the triode Q6 are simultaneously connected with the other end of the resistor R6, the voltage of the resistor R6 and the other end of the resistor R6 is simultaneously connected with the other end of the resistor R6, the resistor R13 and the other end of the resistor R6 and the resistor R6 are simultaneously connected with the other end of the resistor R6 and the resistor R13, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and the other end of the resistor R12 and the resistor R11, the emitter of the triode Q10 is connected with one end of the resistor R15, the collector of the triode Q7 is simultaneously connected with the other end of the capacitor C10, one end of the resistor R16 and one end of the triode Q9, the emitter of the triode Q9 is simultaneously connected with one end of the resistor R17, the other end of the resistor R16 is simultaneously connected with the other end of the resistor R9 and the other end of the resistor R17 and inputs voltage, the other end of the resistor R7 is simultaneously connected with the collector of the triode Q7 and the other end of the resistor R14, several points of the triode Q7 are simultaneously connected with the other end of the resistor R14, the other end of the resistor R15, the collector of the triode Q8 and one end of the inductor L1, one end of the inductor L1 is simultaneously connected with one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2, the other end of the inductor L1 is simultaneously connected with the other end of the resistor R18 and one end of the capacitor C11, and the other end of the capacitor C11 is connected with the resistor R19 and the other end of the resistor R19 is connected with the ground.
In a further embodiment, a current transformer includes a current sampling module; the current sampling module comprises a resistor R21, a capacitor C12, an amplifier U4A, an amplifier U4B, a resistor R20, a linear photoelectric coupler U5, a resistor R22, a resistor R23, a resistor R24, a capacitor C13 and a capacitor C14.
In a further embodiment, pin 3 of the amplifier U4A is simultaneously connected with one end of the resistor R21, one end of the capacitor C12 and pin 1 of the linear optocoupler U4A, pin 2 and pin 4 of the amplifier U4A are simultaneously connected with the other end of the resistor R1 and pin 2 of the linear optocoupler U5 at the same time as being grounded, voltages are input at both ends of the resistor R1, pin 1 of the amplifier U4A is simultaneously connected with one end of the resistor R20 and the other end of the capacitor C12, pin 4 of the amplifier U4A is simultaneously connected with pin 5 of the linear optocoupler U5 and inputs voltages, pin 6 of the linear optocoupler U5 is simultaneously connected with the other end of the resistor R20, pin 4 of the linear optocoupler U5 is simultaneously connected with pin 5 of the resistor R1, one end of the capacitor C13 and one end of the resistor R23, pin 4C 22 is simultaneously connected with the other end of the resistor C14, pin 4B is simultaneously connected with the other end of the resistor C24, and pin 4 of the other end of the resistor C24 is simultaneously connected with the other end of the resistor C24.
In a further embodiment, two ends of a tested sample in the loop are connected with a variable capacitance box in parallel to form an LC parallel resonant loop; the LC parallel resonant tank includes: variable capacitance box A1, inductance L3, inductance L2, capacitance C15, measured sample R25, capacitance C15, capacitance C16; one end of the inductor L3 is connected with one end of the capacitor C16 to input voltage, the other end of the inductor L3 is connected with one end of the inductor L2 and one end of the capacitor C15 at the same time, the other end of the inductor L2 is connected with one end of the tested sample R25 to output voltage, the other end of the capacitor C16 is connected with the other end of the capacitor C15 and the other end of the tested sample R25 to output voltage at the same time, the variable capacitor box A1 is connected with the capacitor C15, and a control end of the variable capacitor box A1 inputs a control signal.
According to the working method of the metal soft magnetic power loss measurement improving device, when metal soft magnetic power loss measurement is carried out, a variable capacitance box is added for adjusting a proper capacitance value, so that the power factor PF value of a loop is infinitely close to 1; simultaneously, a current transformer is connected to obtain an accurate current value, so that a real metal soft magnetic power loss value is obtained; the method comprises the following specific steps:
step 1, starting a working device, so that a signal source generates a sine wave signal with a certain frequency and transmits the sine wave signal to a power amplifier;
step 2, the amplified sine wave signal, the tested metal soft magnet and the power meter form a loss detection loop;
step 3, connecting two ends of the tested metal soft magnet in parallel with a variable capacitance box in the loss detection loop to form an LC parallel resonance circuit;
step 4, adjusting the capacitance value of the variable capacitance box;
step 41, initializing capacitance values of all capacitors in the variable capacitance box;
step 42, converting the control logic of the switching tube connected with each capacitor in the variable capacitance box into capacitance value control;
step 43, the current transformer and the oscilloscope work;
step 44, the current sampling module works to collect current signals;
step 45, transmitting a current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonant internal loop and observing;
step 46, the controller calculates the phase difference between the current signal and the voltage signal;
step 47, outputting a control signal according to the magnitude of the phase difference at the moment to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is smaller than 1, the power factor PF value of the loop is converged to 1, namely, the parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, and the current is minimum, and then a current signal and a voltage signal are output;
and 5, inputting the current signal and the voltage signal into a power meter to obtain the accurate loss value of the measured metal soft magnetic at the moment.
In a further embodiment, a current transformer is connected to the inside of the parallel resonant circuit, so that the accurate current of the resonant internal circuit can be obtained, the direct current resistance R of the wire wound on the metal soft magnetic alloy product is measured in a static state, the loss value of the wire can be obtained as known by P=I 2*R, and the loss value of the real soft magnetic alloy product is obtained by subtracting the line loss from the total loss.
In a further embodiment, the capacitance value of each capacitor inside the variable capacitance box can be adjusted, and the control accuracy of the capacitance value of the variable capacitance box depends on the capacitance value of each small capacitor connected in parallel; when the capacitance value of each small capacitor is smaller and the parallel connection number of the small capacitors is larger, the capacitance value variation range and the precision of the variable capacitor group are higher.
Working principle: when metal soft magnetic power loss measurement is carried out, a working device is started, a signal source generates a sine wave signal with a certain frequency and transmits the sine wave signal to a power amplifier, the signal is protected and input through a resistor R2, a capacitor C1 and a resistor R1 are connected in parallel to absorb peak voltage so as to carry out signal stabilization and input the signal into an amplifier U1A for operation, stable working voltage is improved by a circuit through the voltage stabilizer U2 and the voltage stabilizer U3, the capacitor C3 and the capacitor C4 are filtered by the voltage stabilizer U2, the capacitor C5 and the capacitor C6 are filtered by the voltage stabilizer U3, a pin 1 of the amplifier U1A outputs a signal to the base electrode of a triode Q1, at the moment, the triode Q1 is judged and read according to the voltage at the moment, when the voltage accords with the working voltage value, the triode Q3 is output through an emitter of the triode Q1, the working voltage is output by the triode Q4, the base electrode of the triode Q3 is connected with a base electrode of the triode Q4 at the moment and is input with a sine wave signal, the triode Q4 is matched with a triode Q8 and a triode Q5 for filtering, the signal is formed by the triode Q5, the circuit R7, the signal is amplified by the resistor R7 and the resistor R7 is regulated by the resistor R7, the voltage is regulated by the resistor R11, and the multiple of the voltage is formed by the resistor R11 and the resistor R11;
at the moment, the current of the metal soft magnet is collected, the resistor R21 is the most sampled resistor, and the voltages at two ends of the resistor are transmitted to the sampling through the pins No. 2 and No. 3 of the amplifier U4A; in order to ensure accurate sampling, the interference of a power line and a ground line is avoided, a linear photoelectric coupler U5 is used for isolation, and meanwhile, a sampling current signal is output through an amplifier U4B; the variable capacitance box adjusts a proper capacitance value so that the power factor PF value of the loop is converged to 1; and simultaneously, a current transformer is connected to obtain an accurate current value, so that a real metal soft magnetic power loss value is obtained.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Claims (7)
1. An improved apparatus for measuring metal soft magnetic power loss, comprising:
the signal source is used for generating a sine wave signal with a certain frequency;
the power amplifier is used for amplifying the power of the input sine wave signal so as to ensure the strength and stability of the sine wave signal;
a variable capacitor box for adjusting a proper capacitance value so that the power factor PF value of the loop converges to 1;
the current transformer is used for detecting and obtaining accurate current of the resonant internal loop;
the oscilloscope is used for measuring and obtaining the waveform of the accurate current of the resonant internal loop and observing;
the power meter is used for detecting the power loss of the metal soft magnetic alloy magnetic core product;
the power amplifier includes: resistor R1, resistor R2, capacitor C1, resistor R3, capacitor C2, resistor R4, amplifier U1A, transistor Q1, capacitor C3, capacitor C6, capacitor C5, capacitor C4, voltage regulator U2, voltage regulator U3, transistor Q2, resistor R6, transistor Q3, resistor R5, resistor R7, resistor R8, polarity capacitor C7, transistor Q8, transistor Q4, capacitor C9, resistor R11, resistor R10, capacitor C8, diode D1, diode D2, resistor R9, resistor R12, resistor R13, transistor Q5, transistor Q6, resistor R14, transistor Q7, capacitor C10, resistor R16, resistor R17, transistor Q9, resistor R17, resistor R14, resistor R15, transistor Q6, transistor Q10, resistor R18, inductor L1, capacitor C11, resistor R19;
one end of the resistor R2 is connected with one end of the capacitor C1 and inputs signals, the other end of the resistor R2 is grounded, the other end of the resistor C1 is connected with a No. 3 pin of the amplifier U1A at the same time, the other end of the resistor R1 is grounded, a No. 2 pin of the amplifier U1A is connected with one end of the resistor R3 at the same time, one end of the resistor R4 is connected with one end of the capacitor C2, the other end of the resistor R3 is grounded, a No. 4 pin of the amplifier U1A is connected with one end of the capacitor C6 and the other end of the resistor U3 at the same time, a No. 1 pin of the amplifier U1A is connected with a base of the transistor Q1 at the same time, a No. 2 pin of the amplifier U3 is connected with one end of the resistor C6 at the same time, a No. 2 pin of the amplifier U3 is connected with a base of the amplifier U1 and the base of the resistor Q3 at the same time, a No. 2 pin of the amplifier U3 is connected with a base of the resistor Q1 and the base of the resistor Q3 at the same time, a No. 3 is connected with the other end of the resistor Q5 at the base of the resistor Q3 is connected with the resistor Q6 at the same time, the base of the amplifier Q8 is connected with the base of the resistor Q3 at the same time, the base of the resistor Q3 is connected with the base of the resistor Q3, the base is connected with the base of the base 3 is connected with the base of the base. The other end of the resistor R8 is connected with one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the triode Q3 is connected with the other end of the resistor R5, the base of the triode Q3 is simultaneously connected with the base of the triode Q4, one end of the resistor R12, the positive pole of the diode D1 and one end of the capacitor C8, the emitter of the triode Q4 is connected with one end of the resistor R9, the collector of the triode Q4 is simultaneously connected with one end of the resistor R10, the other end of the capacitor C8, the emitter of the triode Q5, one end of the resistor R10 and the base of the triode Q7, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and one end of the resistor R11, the other end of the triode Q8, the other end of the resistor R5 and the triode Q6 are simultaneously connected with the other end of the resistor R6, the voltage of the resistor R6 and the other end of the resistor R6 is simultaneously connected with the other end of the resistor R6, the resistor R13 and the other end of the resistor R6 and the resistor R6 are simultaneously connected with the other end of the resistor R6 and the resistor R13, the base of the triode Q5 is simultaneously connected with the other end of the resistor R10 and the other end of the resistor R12 and the resistor R11, the emitter of the triode Q10 is connected with one end of the resistor R15, the collector of the triode Q7 is simultaneously connected with the other end of the capacitor C10, one end of the resistor R16 and one end of the triode Q9, the emitter of the triode Q9 is simultaneously connected with one end of the resistor R17, the other end of the resistor R16 is simultaneously connected with the other end of the resistor R9 and the other end of the resistor R17 and inputs voltage, the other end of the resistor R7 is simultaneously connected with the collector of the triode Q7 and the other end of the resistor R14, several points of the triode Q7 are simultaneously connected with the other end of the resistor R14, the other end of the resistor R15, the collector of the triode Q8 and one end of the inductor L1, one end of the inductor L1 is simultaneously connected with one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2, the other end of the inductor L1 is simultaneously connected with the other end of the resistor R18 and one end of the capacitor C11, and the other end of the resistor R19 is connected with the other end of the capacitor C11 and the resistor R19 is connected with the other end of the resistor R19;
the current transformer comprises a current sampling module; the current sampling module comprises a resistor R21, a capacitor C12, an amplifier U4A, an amplifier U4B, a resistor R20, a linear photoelectric coupler U5, a resistor R22, a resistor R23, a resistor R24, a capacitor C13 and a capacitor C14;
the pin 3 of the amplifier U4A is simultaneously connected with one end of the resistor R21, one end of the capacitor C12 and the pin 1 of the linear optocoupler U5, the pin 2 and pin 4 of the amplifier U4A are simultaneously connected with the other end of the resistor R1 and the pin 2 of the linear optocoupler U5, the voltage is input at both ends of the resistor R1, the pin 1 of the amplifier U4A is simultaneously connected with one end of the resistor R20 and the other end of the capacitor C12, the pin 4 of the amplifier U4A is simultaneously connected with the pin 5 of the linear optocoupler U5 and inputs the voltage, the pin 6 of the linear optocoupler U5 is simultaneously connected with the pin 5 of the amplifier U4B, one end of the capacitor C13 and one end of the resistor R23, the pin 3 of the optocoupler U5 is simultaneously connected with the one end of the resistor R20 and the other end of the resistor C14, the pin 4B is simultaneously connected with the other end of the resistor R24 and the other end of the resistor R24;
the two ends of the tested sample in the loop are connected with a variable capacitance box in parallel to form an LC parallel resonant loop; the LC parallel resonant tank includes: variable capacitance box A1, inductance L3, inductance L2, capacitance C15, measured sample R25, capacitance C15, capacitance C16; one end of the inductor L3 is connected with one end of the capacitor C16 to input voltage, the other end of the inductor L3 is connected with one end of the inductor L2 and one end of the capacitor C15 at the same time, the other end of the inductor L2 is connected with one end of the tested sample R25 to output voltage, the other end of the capacitor C16 is connected with the other end of the capacitor C15 and the other end of the tested sample R25 to output voltage at the same time, the variable capacitor box A1 is connected with the capacitor C15, and a control end of the variable capacitor box A1 inputs a control signal.
2. The improved metal soft magnetic power loss measurement device according to claim 1, wherein the model of the power amplifier is 1140LA, and the rated working power of the power amplifier is 1000W; the model of the power meter is CH2335; the model of the signal source is TEKMD03AFG.
3. The improved metal soft magnetic power loss measurement device according to claim 1, wherein the linear photocoupler U5 is of the type HCNR200.
4. The improved apparatus for measuring metal soft magnetic power loss according to claim 1, wherein the variable capacitance box is internally composed of a plurality of capacitors, each capacitor is connected with a switching tube, and the capacitance value of the variable capacitance box is controlled by checking the waveform of the sampling current at this time.
5. A method of operating a metal soft magnetic power loss measurement modification apparatus as defined in any one of claims 1 to 4, characterized in that when metal soft magnetic power loss measurement is performed, the adjustment of the appropriate capacitance value is performed by adding a variable capacitance box so that the power factor PF value of the loop is infinitely close to 1; simultaneously, a current transformer is connected to obtain an accurate current value, so that a real metal soft magnetic power loss value is obtained; the method comprises the following specific steps:
step 1, starting a working device, so that a signal source generates a sine wave signal with a certain frequency and transmits the sine wave signal to a power amplifier;
step 2, the amplified sine wave signal, the tested metal soft magnet and the power meter form a loss detection loop;
step 3, connecting two ends of the tested metal soft magnet in parallel with a variable capacitance box in the loss detection loop to form an LC parallel resonance circuit;
step 4, adjusting the capacitance value of the variable capacitance box;
step 41, initializing capacitance values of all capacitors in the variable capacitance box;
step 42, converting the control logic of the switching tube connected with each capacitor in the variable capacitance box into capacitance value control;
step 43, the current transformer and the oscilloscope work;
step 44, the current sampling module works to collect current signals;
step 45, transmitting a current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonant internal loop and observing;
step 46, the controller calculates the phase difference between the current signal and the voltage signal;
step 47, outputting a control signal according to the magnitude of the phase difference at the moment to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is smaller than 1, the power factor PF value of the loop is converged to 1, namely, the parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, and the current is minimum, and then a current signal and a voltage signal are output;
and 5, inputting the current signal and the voltage signal into a power meter to obtain the accurate loss value of the measured metal soft magnetic at the moment.
6. The working method of the improved metal soft magnetic power loss measurement device is characterized in that a current transformer is connected into a parallel resonant circuit, so that accurate current of the resonant internal circuit can be obtained, the loss value of a wire can be obtained by measuring the direct current resistance R wound on the wire of a metal soft magnetic alloy product in a static state, and the loss value of a real soft magnetic alloy product is obtained by subtracting the line loss from the total loss as known by P=I 2*R.
7. The method for improving the metal soft magnetic power loss measurement device according to claim 5, wherein the capacitance value of each capacitor in the variable capacitor box can be adjusted, and the control precision of the capacitance value of the variable capacitor box depends on the capacitance value of each small capacitor connected in parallel; when the capacitance value of each small capacitor is smaller and the parallel connection number of the small capacitors is larger, the capacitance value variation range and the precision of the variable capacitor group are higher.
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| CN110133547A (en) * | 2019-05-30 | 2019-08-16 | 南京邮电大学 | A kind of method of precise measurement core loss |
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| JPS63295973A (en) * | 1987-05-28 | 1988-12-02 | Central Res Inst Of Electric Power Ind | Measurement of loss in induction coil |
| RU2421748C2 (en) * | 2010-03-04 | 2011-06-20 | Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный технический университет (Новочеркасский политехнический институт)" | Test method of products from magnetically soft materials |
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Address after: 243000 No.1, Cishan Road, Yushan Economic Development Zone, Yushan District, Ma'anshan, Anhui Province Patentee after: Ma'anshan Xinkangda Magnetic Industry Co.,Ltd. Address before: 243000 No.1, Cishan Road, Yushan Economic Development Zone, Yushan District, Ma'anshan, Anhui Province Patentee before: MAANSHAN NEW CONDA MAGNETIC INDUSTRIAL CO.,LTD. |