CN112230050A - Metal soft magnetic power loss measurement improvement device and working method thereof - Google Patents
Metal soft magnetic power loss measurement improvement device and working method thereof Download PDFInfo
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- CN112230050A CN112230050A CN202011091176.4A CN202011091176A CN112230050A CN 112230050 A CN112230050 A CN 112230050A CN 202011091176 A CN202011091176 A CN 202011091176A CN 112230050 A CN112230050 A CN 112230050A
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- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000005259 measurement Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 229910001004 magnetic alloy Inorganic materials 0.000 claims abstract description 22
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 173
- 238000001514 detection method Methods 0.000 claims description 6
- 238000011017 operating method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
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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 device 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, the circuit is improved, and accurate data is obtained, so that accurate power loss of the soft magnetic alloy product is obtained; the current transformer is connected in the parallel resonance loop, so that the accurate current of the resonance loop 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 according to the fact that P = I ^ 2R, and then the line loss is subtracted from the total loss to obtain the real loss value of the soft magnetic alloy product.
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 the metal soft magnetic alloy magnetic core product, and particularly relates to an improved device for measuring the 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 electronic industry, precise instruments and meters, remote control and automatic control systems, is mainly used for energy conversion and information processing in a comprehensive way, and is an important material in national economy.
The power loss measurement of the present metal soft magnetic alloy core is performed with reference to the principle of fig. 1: the signal source generates a sine wave signal with a certain frequency, the sine wave signal is amplified through the power amplifier, then the tested metal soft magnetic alloy magnetic core product is wound for a certain number of turns and connected into a loop, and the power meter directly converts the voltage and the current of the tested object into a power value after sampling, namely the power loss value of the tested product.
However, when the power loss measurement of the metal soft magnetic alloy magnetic core in the prior art is carried out, because whether the phase of the sampling voltage and the phase of the sampling current are the same or not can not be accurately detected, the measured value has an error, and because the loop current is too large when the capacitor is not available in the same year, the temperature rise is large when the product is measured, and the error is larger.
Disclosure of Invention
The purpose of the invention is as follows: an improved device for measuring the soft magnetic power loss of metal and an operating method thereof are provided to solve the above problems.
The technical scheme is as follows: a metallic soft magnetic power loss measurement improvement device, 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;
the variable capacitance box is used 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 acquiring accurate current of the resonance internal loop;
the oscilloscope is used for measuring and acquiring the waveform of the accurate current of the resonance internal loop and observing the waveform;
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: a resistor R1, a resistor R2, a capacitor C2, a resistor R2, an amplifier U1 2, a transistor Q2, a capacitor C2, a regulator U2, a transistor Q2, a resistor R2, a polar capacitor C2, a transistor Q2, a capacitor C2, a resistor R2, a capacitor C2, a diode D2, a resistor R2, a transistor Q2, a capacitor C2, a resistor R2, a transistor Q2, a resistor R2, a resistor L2, a resistor R2, and a;
one end of the resistor R2 is connected with one end of the capacitor C1 and inputs a signal, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is connected with one end of the resistor R1 and the pin 3 of the amplifier U1A, the other end of the resistor R1 is grounded, the pin 2 of the amplifier U1A is connected with 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 grounded, the pin 4 of the amplifier U1A is connected with one end of the capacitor C6 and the pin 3 of the regulator U3, the pin 1 of the amplifier U1A is connected with the base of the triode Q1, the pin 2 of the regulator U3 is connected with the other end of the capacitor C6 and one end of the capacitor C5 and grounded, the pin 1 of the regulator U3 is connected with the other end of the capacitor C5 and one end of the resistor R5, pin 8 of the amplifier U1A is connected to pin 3 of the regulator U2 and one end of the capacitor C3, pin 2 of the regulator U2 is connected to the other end of the capacitor C3 and one end of the capacitor C4, pin 1 of the regulator U2 is connected to the other end of the capacitor C4 and one end of the resistor R6, pin 1 of the amplifier U1A is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the other end of the resistor R6, the base of the transistor Q8 and one end of the capacitor C9, the emitter of the transistor Q1 is connected to the collector of the transistor Q3 and the emitter of the transistor Q2, the base of the transistor Q2 is connected to one end of the resistor R7 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the transistor Q3 is connected to the other end of the resistor R5, the base of the transistor Q3 is simultaneously connected to the base of the transistor Q4, one end of the resistor R12, the anode of the diode D1 and one end of the capacitor C8, the emitter of the transistor Q4 is connected to one end of the resistor R9, the collector of the transistor Q4 is simultaneously connected to one end of the resistor R10, the other end of the capacitor C8, the emitter of the transistor Q5, one end of the resistor R10 and the base of the transistor Q7, the base of the transistor Q5 is simultaneously connected to the other end of the resistor R10 and one end of the resistor R11, the collector of the transistor Q8 is simultaneously connected to the other end of the capacitor C9, the other end of the resistor R11, the collector of the transistor Q5 and the base of the transistor Q6, an emitter of the transistor Q8 is connected to one end of the resistor R13, a collector of the transistor Q2 is connected to one end of the resistor R6 and the other end of the resistor R12, the other end of the resistor R13 is connected to the other end of the resistor R12 and a collector of the transistor Q6, a cathode of the diode D1 is connected to an anode of the diode D2, an anode of the diode D2 is connected to the other end of the resistor R5 and the other end of the resistor R9, a collector of the transistor Q6 is connected to the other end of the resistor R13 and a collector of the transistor Q10, a voltage is input to the transistor Q6, an emitter of the transistor Q6 is connected to one end of the resistor R14 and a base of the transistor Q10, an emitter of the transistor Q10 is connected to one end of the resistor R15, a collector of the transistor Q7 is connected to the other end of the capacitor C10, and a collector of the capacitor C10, One end of the resistor R16 is connected to a base of the transistor Q9, an emitter of the transistor Q9 is connected to one end of the resistor R17, the other end of the resistor R16 is connected to the other end of the resistor R9 and the other end of the resistor R17 at the same time, a voltage is input to the other end of the resistor R7, a collector of the transistor Q7 and the other end of the resistor R14 are connected to the other end of the resistor R7 at the same time, the other end of the resistor R15, a collector of the transistor Q8 and one end of the inductor L1 are connected to several points of the transistor Q7 at the same time, one end of the inductor L1 is connected to one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2 at the same time, the other end of the inductor L1 is connected to the other end of the resistor R18 and one end of the capacitor C11 at the same time, the other end of the capacitor C11 is connected to one end of, the other end of the resistor R19 is grounded.
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;
a pin 3 of the amplifier U4A is connected to one end of the resistor R21, one end of the capacitor C12 and a pin 1 of the linear photocoupler U4A, a pin 2 and a pin 4 of the amplifier U4A are connected to ground and are connected to the other end of the resistor R1 and a pin 2 of the linear photocoupler U5, a voltage is input to both ends of the resistor R1, a pin 1 of the amplifier U4A is connected to one end of the resistor R20 and the other end of the capacitor C12, a pin 4 of the amplifier U4A is connected to a pin 5 of the linear photocoupler U5 and is input to the voltage, a pin 6 of the linear photocoupler U5 is connected to the other end of the resistor R20, a pin 4 of the linear photocoupler U5 is connected to a pin 5 of the amplifier U4B, one end of the capacitor C13 and one end of the resistor R23, no. 3 pin of the linear photoelectric coupler U5 is connected with one end of the resistor R22, No. 6 pin of the amplifier U4B is connected with the other end of the resistor R22, No. 4 pin of the amplifier U4B inputs voltage, No. 7 pin of the amplifier U4B is connected with the other end of the capacitor C13, the other end of the resistor R23, one end of the capacitor C14 and one end of the resistor R24, and No. 8 pin of the amplifier U4B is connected with the other end of the resistor R24 and the other end of the capacitor C14 and grounded.
Preferably, two ends of a sample to be measured in the loop are connected with a variable capacitance box in parallel to form an LC parallel resonance loop; the LC parallel resonant tank includes: the variable capacitance box A1, an inductor L3, an inductor L2, a capacitor C15, a tested sample R25, a capacitor C15 and a capacitor C16; one end of the inductor L3 is connected to one end of a capacitor C16, the other end of the inductor L3 is connected to one end of the inductor L2 and one end of the capacitor C15, the other end of the inductor L2 is connected to one end of the sample R25 to be measured and outputs a voltage, the other end of the capacitor C16 is connected to the other end of the capacitor C15 and the other end of the sample R25 to be measured and outputs a voltage, the variable capacitor box a1 is connected to the capacitor C15, and a control end of the variable capacitor box a1 is connected to a control signal.
Preferably, the power amplifier is model 1140LA, and the rated working power is 1000W; the model of the power meter is CH 2335; the model of the signal source is TEKMD03 AFG; the model of the linear photocoupler U5 is HCNR 200.
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 looking up the waveform of the sampling current at the moment.
According to the working method of the metal soft magnetic power loss measurement improvement device, when the metal soft magnetic power loss is measured, 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; meanwhile, a current transformer is connected in, so that an accurate current value is obtained, and 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 3, connecting a variable capacitance box in parallel at two ends of the tested metal soft magnet 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 the capacitance value of each capacitor in the variable capacitance box;
42, converting the control logic of the switch tube connected with each capacitor in the variable capacitance box into capacitance value control;
43, working by the current transformer and the oscilloscope;
step 44, the current sampling module works to collect current signals;
step 45, transmitting the current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonance 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 phase difference to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is less than 1, the power factor PF value of the loop is converged to 1, namely a parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, 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 magnet at the moment.
Preferably, a current transformer is connected into the parallel resonant circuit, so that accurate current of the resonant internal circuit can be obtained, the direct current resistance R wound on a metal soft magnetic alloy product wire is measured in a static state, the loss value of the wire can be obtained according to P = I ^ 2R, and then 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 number of the small capacitors connected in parallel is larger, the capacitance value change range and the accuracy of the variable capacitor bank are higher.
Has the advantages that: by improving and innovating the attached figure 1 to obtain a schematic diagram of the attached figure 2, introducing a variable capacitance box and a current transformer, improving a circuit, and acquiring accurate data, so that accurate power loss of a soft magnetic alloy product is obtained; the method comprises the following steps that a variable capacitance box is connected in parallel at two ends of a sample to be measured (which can be understood as an inductive load) in a loop to form LC parallel resonance, the power factor PF value of the loop is converged to 1 by adjusting a proper capacitance value, namely a parallel resonance point is reached, the total impedance of the whole loop is the largest at the moment, the current is the smallest, the phase of sampling voltage and the phase of sampling current input into a power meter are the same at the moment, no phase difference exists, and no error exists, so that the power of a power amplifier can be transmitted to the maximum, and the phenomenon that the temperature is increased to cause that the measured value is large when the product is measured due to the fact that the loop current is overlarge when no capacitance exists; the current transformer is connected in the parallel resonance loop, so that the accurate current of the resonance loop 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 according to the fact that P = I ^ 2R, and then the line loss is subtracted from the total loss to obtain the real loss value of the soft magnetic alloy product.
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 the metal soft magnetic power loss measuring device 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 resonance circuit of the present invention.
Fig. 5 is a circuit diagram of the power amplifier of the present invention.
Fig. 6 is a circuit diagram of a current sampling module of the present invention.
Detailed Description
In this embodiment, as shown in fig. 2, a metallic soft magnetic power loss measurement improvement device includes: the device 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: a resistor R1, a resistor R2, a capacitor C2, a resistor R2, an amplifier U1 2, a transistor Q2, a capacitor C2, a regulator U2, a transistor Q2, a resistor R2, a polar capacitor C2, a transistor Q2, a capacitor C2, a resistor R2, a capacitor C2, a diode D2, a resistor R2, a resistor Q2, a transistor Q2, a resistor R2, a capacitor C2, a resistor R2, a transistor Q2, a resistor R2, a resistor Q2, a resistor L2, and a resistor L2.
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 capacitor C1 is connected to one end of the resistor R1 and the pin No. 3 of the amplifier U1A, the other end of the resistor R1 is grounded, the pin No. 2 of the amplifier U1A is 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 grounded, the pin No. 4 of the amplifier U1A is connected to one end of the capacitor C6 and the pin No. 3 of the regulator U3, the pin No. 1 of the amplifier U1A is connected to the base of the transistor Q1, the pin No. 2 of the regulator U3 is connected to the other end of the capacitor C6 and one end of the capacitor C5 and grounded, the pin No. 1 of the regulator U5 is connected to the other end of the pin No. 1 of the capacitor C5 and one end of the resistor R5, pin 8 of the amplifier U1A is connected to pin 3 of the regulator U2 and one end of the capacitor C3, pin 2 of the regulator U2 is connected to the other end of the capacitor C3 and one end of the capacitor C4, pin 1 of the regulator U2 is connected to the other end of the capacitor C4 and one end of the resistor R6, pin 1 of the amplifier U1A is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the other end of the resistor R6, the base of the transistor Q8 and one end of the capacitor C9, the emitter of the transistor Q1 is connected to the collector of the transistor Q3 and the emitter of the transistor Q2, the base of the transistor Q2 is connected to one end of the resistor R7 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the transistor Q3 is connected to the other end of the resistor R5, the base of the transistor Q3 is simultaneously connected to the base of the transistor Q4, one end of the resistor R12, the anode of the diode D1 and one end of the capacitor C8, the emitter of the transistor Q4 is connected to one end of the resistor R9, the collector of the transistor Q4 is simultaneously connected to one end of the resistor R10, the other end of the capacitor C8, the emitter of the transistor Q5, one end of the resistor R10 and the base of the transistor Q7, the base of the transistor Q5 is simultaneously connected to the other end of the resistor R10 and one end of the resistor R11, the collector of the transistor Q8 is simultaneously connected to the other end of the capacitor C9, the other end of the resistor R11, the collector of the transistor Q5 and the base of the transistor Q6, an emitter of the transistor Q8 is connected to one end of the resistor R13, a collector of the transistor Q2 is connected to one end of the resistor R6 and the other end of the resistor R12, the other end of the resistor R13 is connected to the other end of the resistor R12 and a collector of the transistor Q6, a cathode of the diode D1 is connected to an anode of the diode D2, an anode of the diode D2 is connected to the other end of the resistor R5 and the other end of the resistor R9, a collector of the transistor Q6 is connected to the other end of the resistor R13 and a collector of the transistor Q10, a voltage is input to the transistor Q6, an emitter of the transistor Q6 is connected to one end of the resistor R14 and a base of the transistor Q10, an emitter of the transistor Q10 is connected to one end of the resistor R15, a collector of the transistor Q7 is connected to the other end of the capacitor C10, and a collector of the capacitor C10, One end of the resistor R16 is connected to a base of the transistor Q9, an emitter of the transistor Q9 is connected to one end of the resistor R17, the other end of the resistor R16 is connected to the other end of the resistor R9 and the other end of the resistor R17 at the same time, a voltage is input to the other end of the resistor R7, a collector of the transistor Q7 and the other end of the resistor R14 are connected to the other end of the resistor R7 at the same time, the other end of the resistor R15, a collector of the transistor Q8 and one end of the inductor L1 are connected to several points of the transistor Q7 at the same time, one end of the inductor L1 is connected to one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2 at the same time, the other end of the inductor L1 is connected to the other end of the resistor R18 and one end of the capacitor C11 at the same time, the other end of the capacitor C11 is connected to one end of, the other end of the resistor R19 is grounded.
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 connected to one terminal of the resistor R21, one terminal of the capacitor C12 and pin 1 of the linear photocoupler U4A, pin 2 and pin 4 of the amplifier U4A are connected to ground and are connected to the other terminal of the resistor R1 and pin 2 of the linear photocoupler U5, a voltage is input to both terminals of the resistor R1, pin 1 of the amplifier U4A is connected to one terminal of the resistor R20 and the other terminal of the capacitor C12, pin 4 of the amplifier U4A is connected to pin 5 of the linear photocoupler U5 and is input with a voltage, pin 6 of the linear photocoupler U5 is connected to the other terminal of the resistor R20, pin 4 of the linear photocoupler U5 is connected to pin 5 of the amplifier U4B, one terminal of the capacitor C13 and one terminal of the resistor R23, no. 3 pin of the linear photoelectric coupler U5 is connected with one end of the resistor R22, No. 6 pin of the amplifier U4B is connected with the other end of the resistor R22, No. 4 pin of the amplifier U4B inputs voltage, No. 7 pin of the amplifier U4B is connected with the other end of the capacitor C13, the other end of the resistor R23, one end of the capacitor C14 and one end of the resistor R24, and No. 8 pin of the amplifier U4B is connected with the other end of the resistor R24 and the other end of the capacitor C14 and grounded.
In a further embodiment, two ends of a sample to be measured in the loop are connected with a variable capacitance box in parallel to form an LC parallel resonance loop; the LC parallel resonant tank includes: the variable capacitance box A1, an inductor L3, an inductor L2, a capacitor C15, a tested sample R25, a capacitor C15 and a capacitor C16; one end of the inductor L3 is connected to one end of a capacitor C16, the other end of the inductor L3 is connected to one end of the inductor L2 and one end of the capacitor C15, the other end of the inductor L2 is connected to one end of the sample R25 to be measured and outputs a voltage, the other end of the capacitor C16 is connected to the other end of the capacitor C15 and the other end of the sample R25 to be measured and outputs a voltage, the variable capacitor box a1 is connected to the capacitor C15, and a control end of the variable capacitor box a1 is connected to a control signal.
According to the working method of the metal soft magnetic power loss measurement improvement device, when the metal soft magnetic power loss is measured, 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; meanwhile, a current transformer is connected in, so that an accurate current value is obtained, and 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 3, connecting a variable capacitance box in parallel at two ends of the tested metal soft magnet 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 the capacitance value of each capacitor in the variable capacitance box;
42, converting the control logic of the switch tube connected with each capacitor in the variable capacitance box into capacitance value control;
43, working by the current transformer and the oscilloscope;
step 44, the current sampling module works to collect current signals;
step 45, transmitting the current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonance 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 phase difference to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is less than 1, the power factor PF value of the loop is converged to 1, namely a parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, 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 magnet at the moment.
In a further embodiment, a current transformer is connected in the parallel resonant circuit, so that accurate current of the resonant internal circuit can be obtained, the direct current resistance R wound on a metal soft magnetic alloy product wire is measured in a static state, the loss value of the wire can be obtained according to P = I ^2 ^ R, and then the line loss is subtracted from the total loss to obtain the real loss value of the soft magnetic alloy product.
In a further embodiment, 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 number of the small capacitors connected in parallel is larger, the capacitance value change range and the accuracy of the variable capacitor bank are higher.
The working principle is as follows: when the metal soft magnetic power loss measurement is carried out, the working device is started, a signal source generates a sine wave signal with a certain frequency and transmits the sine wave signal to the power amplifier, the signal is protected and input through a resistor R2, at the moment, a capacitor C1 and a resistor R1 are connected in parallel to absorb peak voltage so as to carry out operation on a signal stabilizing input amplifier U1A, so that the stable working voltage is improved for the circuit through a voltage stabilizer U2 and a voltage stabilizer U3, the capacitor C3 and a capacitor C4 carry out filtering on a voltage stabilizer U2, the capacitor C5 and the capacitor C6 carry out filtering on a voltage stabilizer U3, at the same time, a pin 1 of the amplifier U1A outputs a signal to the base of a triode Q1, at the moment, whether the triode Q1 conducts or not is judged according to the voltage at the moment, when the voltage accords with the working voltage value, the emitter of the triode Q1 outputs a value Q3, at the moment, the base of the triode Q3 is connected with the base of the triode Q4 and a sine wave signal is input, the triode Q4 is matched with the triode Q8 and the triode Q5 to form an amplifying circuit to amplify the signal, meanwhile, the triode Q6, the triode Q7, the triode Q9 and the triode Q10 form an amplification factor adjusting circuit, the amplification factor is adjusted according to the voltage value of the voltage at the moment, and the signal is output to a filter circuit formed by a resistor R18, an inductor L1, a capacitor C11 and a resistor R19 through a resistor R7 to be output;
at the moment, the current of the metal soft magnet is collected, the resistor R21 is the sampling resistor, and the voltage at the two ends of the resistor is transmitted to the sampling resistor through the No. 2 pin and the No. 3 pin of the amplifier U4A; in order to ensure accurate sampling and avoid the interference of a power line and a ground wire, a linear photoelectric coupler U5 is used for isolation, and a sampling current signal is output in a document mode through an amplifier U4B; the variable capacitance box adjusts a proper capacitance value, so that the power factor PF value of the loop converges to 1; and meanwhile, a current transformer is connected, so that an accurate current value is obtained, and a real metal soft magnetic power loss value is obtained.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. An improved apparatus for measuring soft magnetic power loss of a metal, 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;
the variable capacitance box is used 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 acquiring accurate current of the resonance internal loop;
the oscilloscope is used for measuring and acquiring the waveform of the accurate current of the resonance internal loop and observing the waveform;
and the power meter is used for detecting the power loss of the metal soft magnetic alloy magnetic core product.
2. The metallic soft magnetic power loss measurement improvement device according to claim 1, wherein the power amplifier comprises: a resistor R1, a resistor R2, a capacitor C2, a resistor R2, an amplifier U1 2, a transistor Q2, a capacitor C2, a regulator U2, a transistor Q2, a resistor R2, a polar capacitor C2, a transistor Q2, a capacitor C2, a resistor R2, a capacitor C2, a diode D2, a resistor R2, a transistor Q2, a capacitor C2, a resistor R2, a transistor Q2, a resistor R2, a resistor L2, a resistor R2, and a;
one end of the resistor R2 is connected with one end of the capacitor C1 and inputs a signal, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is connected with one end of the resistor R1 and the pin 3 of the amplifier U1A, the other end of the resistor R1 is grounded, the pin 2 of the amplifier U1A is connected with 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 grounded, the pin 4 of the amplifier U1A is connected with one end of the capacitor C6 and the pin 3 of the regulator U3, the pin 1 of the amplifier U1A is connected with the base of the triode Q1, the pin 2 of the regulator U3 is connected with the other end of the capacitor C6 and one end of the capacitor C5 and grounded, the pin 1 of the regulator U3 is connected with the other end of the capacitor C5 and one end of the resistor R5, pin 8 of the amplifier U1A is connected to pin 3 of the regulator U2 and one end of the capacitor C3, pin 2 of the regulator U2 is connected to the other end of the capacitor C3 and one end of the capacitor C4, pin 1 of the regulator U2 is connected to the other end of the capacitor C4 and one end of the resistor R6, pin 1 of the amplifier U1A is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the other end of the resistor R6, the base of the transistor Q8 and one end of the capacitor C9, the emitter of the transistor Q1 is connected to the collector of the transistor Q3 and the emitter of the transistor Q2, the base of the transistor Q2 is connected to one end of the resistor R7 and one end of the resistor R8, and the other end of the resistor R8 is connected to one end of the polar capacitor C7, the other end of the polar capacitor C7 is grounded, the emitter of the transistor Q3 is connected to the other end of the resistor R5, the base of the transistor Q3 is simultaneously connected to the base of the transistor Q4, one end of the resistor R12, the anode of the diode D1 and one end of the capacitor C8, the emitter of the transistor Q4 is connected to one end of the resistor R9, the collector of the transistor Q4 is simultaneously connected to one end of the resistor R10, the other end of the capacitor C8, the emitter of the transistor Q5, one end of the resistor R10 and the base of the transistor Q7, the base of the transistor Q5 is simultaneously connected to the other end of the resistor R10 and one end of the resistor R11, the collector of the transistor Q8 is simultaneously connected to the other end of the capacitor C9, the other end of the resistor R11, the collector of the transistor Q5 and the base of the transistor Q6, an emitter of the transistor Q8 is connected to one end of the resistor R13, a collector of the transistor Q2 is connected to one end of the resistor R6 and the other end of the resistor R12, the other end of the resistor R13 is connected to the other end of the resistor R12 and a collector of the transistor Q6, a cathode of the diode D1 is connected to an anode of the diode D2, an anode of the diode D2 is connected to the other end of the resistor R5 and the other end of the resistor R9, a collector of the transistor Q6 is connected to the other end of the resistor R13 and a collector of the transistor Q10, a voltage is input to the transistor Q6, an emitter of the transistor Q6 is connected to one end of the resistor R14 and a base of the transistor Q10, an emitter of the transistor Q10 is connected to one end of the resistor R15, a collector of the transistor Q7 is connected to the other end of the capacitor C10, and a collector of the capacitor C10, One end of the resistor R16 is connected to a base of the transistor Q9, an emitter of the transistor Q9 is connected to one end of the resistor R17, the other end of the resistor R16 is connected to the other end of the resistor R9 and the other end of the resistor R17 at the same time, a voltage is input to the other end of the resistor R7, a collector of the transistor Q7 and the other end of the resistor R14 are connected to the other end of the resistor R7 at the same time, the other end of the resistor R15, a collector of the transistor Q8 and one end of the inductor L1 are connected to several points of the transistor Q7 at the same time, one end of the inductor L1 is connected to one end of the resistor R18, the other end of the resistor R4 and the other end of the capacitor C2 at the same time, the other end of the inductor L1 is connected to the other end of the resistor R18 and one end of the capacitor C11 at the same time, the other end of the capacitor C11 is connected to one end of, the other end of the resistor R19 is grounded.
3. The metal soft magnetic power loss measurement improvement device according to claim 1, wherein 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;
a pin 3 of the amplifier U4A is connected to one end of the resistor R21, one end of the capacitor C12 and a pin 1 of the linear photocoupler U4A, a pin 2 and a pin 4 of the amplifier U4A are connected to ground and are connected to the other end of the resistor R1 and a pin 2 of the linear photocoupler U5, a voltage is input to both ends of the resistor R1, a pin 1 of the amplifier U4A is connected to one end of the resistor R20 and the other end of the capacitor C12, a pin 4 of the amplifier U4A is connected to a pin 5 of the linear photocoupler U5 and is input to the voltage, a pin 6 of the linear photocoupler U5 is connected to the other end of the resistor R20, a pin 4 of the linear photocoupler U5 is connected to a pin 5 of the amplifier U4B, one end of the capacitor C13 and one end of the resistor R23, no. 3 pin of the linear photoelectric coupler U5 is connected with one end of the resistor R22, No. 6 pin of the amplifier U4B is connected with the other end of the resistor R22, No. 4 pin of the amplifier U4B inputs voltage, No. 7 pin of the amplifier U4B is connected with the other end of the capacitor C13, the other end of the resistor R23, one end of the capacitor C14 and one end of the resistor R24, and No. 8 pin of the amplifier U4B is connected with the other end of the resistor R24 and the other end of the capacitor C14 and grounded.
4. The improved device for measuring the soft magnetic power loss of metal as claimed in claim 1, wherein a variable capacitance box is connected in parallel at two ends of a sample to be measured in the loop to form an LC parallel resonance loop; the LC parallel resonant tank includes: the variable capacitance box A1, an inductor L3, an inductor L2, a capacitor C15, a tested sample R25, a capacitor C15 and a capacitor C16; one end of the inductor L3 is connected to one end of a capacitor C16, the other end of the inductor L3 is connected to one end of the inductor L2 and one end of the capacitor C15, the other end of the inductor L2 is connected to one end of the sample R25 to be measured and outputs a voltage, the other end of the capacitor C16 is connected to the other end of the capacitor C15 and the other end of the sample R25 to be measured and outputs a voltage, the variable capacitor box a1 is connected to the capacitor C15, and a control end of the variable capacitor box a1 is connected to a control signal.
5. The improvement of claim 1, wherein the power amplifier is of type 1140LA and has a rated operating power of 1000W; the model of the power meter is CH 2335; the model of the signal source is TEKMD03 AFG.
6. The improved device for measuring the soft magnetic power loss of metal as claimed in claim 3, wherein the model of the linear photocoupler U5 is HCNR 200.
7. The improved metal soft magnetic power loss measurement device 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 looking at the waveform of the sampling current at the moment.
8. An operating method of the metal soft magnetic power loss measurement improvement device according to any one of claims 2 to 7, characterized in that when the metal soft magnetic power loss measurement is carried out, the variable capacitance box is added for adjusting a proper capacitance value, so that the power factor PF value of the loop is infinitely close to 1; meanwhile, a current transformer is connected in, so that an accurate current value is obtained, and 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 a variable capacitance box in parallel at two ends of the tested metal soft magnet 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 the capacitance value of each capacitor in the variable capacitance box;
42, converting the control logic of the switch tube connected with each capacitor in the variable capacitance box into capacitance value control;
43, working by the current transformer and the oscilloscope;
step 44, the current sampling module works to collect current signals;
step 45, transmitting the current signal to an oscilloscope for measurement to obtain the waveform of the accurate current of the resonance 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 phase difference to control the working state of a capacitance switching tube in the variable capacitance box;
step 48, when the phase difference is less than 1, the power factor PF value of the loop is converged to 1, namely a parallel resonance point is reached, at the moment, the total impedance of the whole loop is maximum, 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 magnet at the moment.
9. The operating method of the metal soft magnetic power loss measurement improvement device according to claim 8, wherein a current transformer is connected to the inside of the parallel resonant circuit, so that an accurate current of the resonant internal circuit can be obtained, and the direct current resistance R wound on the metal soft magnetic alloy product wire is measured in a static state, and as can be known from P = I ^ 2R, the loss value of the wire can be obtained, and then the line loss is subtracted from the total loss, so that the loss value of the real soft magnetic alloy product is obtained.
10. The operating method of the metal soft magnetic power loss measurement improvement device according to claim 8, wherein the capacitance value of each capacitor inside 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 number of the small capacitors connected in parallel is larger, the capacitance value change range and the accuracy of the variable capacitor bank are higher.
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