An inductance characteristic parameter detector based on enterprise use environment

Abstract

The present invention discloses an inductor characteristic parameter detector based on an enterprise usage environment, which includes a bidirectional programmable voltage source, an adaptive inductor oscillator, an inductor voltage detector, a saturation current detector, a constant current load, and a controller. The bidirectional programmable voltage source is electrically connected to the adaptive inductor oscillator and is also electrically connected to the saturation current detector. In this inductor characteristic parameter detector based on the enterprise usage environment, the parasitic capacitance of the inductor has little influence on the measured value, the measurement accuracy is very high, the measurement time is very fast, and the step method + delay method is adopted to measure the saturation current value I S , and the incremental detection method is adopted, with very high measurement accuracy, and at the same time, the unsoldered state of the inductor can be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of inductance detection, and in particular to an inductance characteristic parameter detector based on an enterprise use environment. Background Art

[0002] Inductors are widely used in various electronic devices. Commonly used inductors can be divided into small current inductors and large current power inductors. Small current inductors are used for various signal filtering, while large current power inductors are used in various DC-DC converters, Class D power comparators and other occasions to complete the function of energy storage and release. Power inductors work in a high current and high voltage state, so more attention is paid to the saturation current value and withstand voltage characteristics of the inductor. Any inductor has a saturation current I S , I S The value of is related to the shape, type and number of turns of the magnetic core. When the working current of the inductor exceeds I S When the inductor reaches the saturation state, the inductance value drops sharply, and the current no longer increases linearly but changes suddenly, directly damaging the driver. Similarly, when the inductor's withstand voltage value does not meet the requirements and a breakdown occurs or there is a turn-to-turn short circuit, the eddy current inductor generates severe heat, thereby damaging the inductor and the driver.

[0003] In the actual use environment of power inductors in enterprises, the working current can reach hundreds of mA to thousands of mA, and it is necessary to detect the inductance value, equivalent internal resistance, withstand voltage characteristics, saturation current value, cold welding state, inter-turn short circuit, consistency characteristics, etc. The cold welding state of the inductor under low current state can only detect the open circuit state, and cannot detect the "cold connection" phenomenon caused by poor welding. It can only be detected after the "cold connection" part is burned out when working with high current.

[0004] The existing RLC inductance tester uses several mA of sine wave current with different frequencies to measure the inductance value and loss value, so there are the following problems:

[0005] 1. The measurement time is about 0.5s to 1s, so the measurement time is slow and not convenient for batch detection;

[0006] 2. It can only measure the inductance value and loss value. Since the measuring current is small, it is impossible to detect the cold soldering state of the inductor;

[0007] 3. The saturation current value I of the inductor cannot be detected S And the withstand voltage characteristics of the inductor;

[0008] 4. Unable to detect the inductance consistency state characteristics

[0009] Based on the above-mentioned defects, an inductance characteristic parameter detector based on an enterprise use environment is proposed. Summary of the invention

[0010] The purpose of the present invention is to provide an inductance characteristic parameter detector based on an enterprise use environment, which has a simple circuit, stable operation, and can quickly detect inductance characteristic parameters in batches, thus solving the problems in the prior art.

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an inductance characteristic parameter detector based on an enterprise use environment, comprising a bidirectional programmable voltage source, an adaptive inductance type oscillator, an inductance voltage detector, a saturation current detector, a constant current load and a controller, wherein the bidirectional programmable voltage source is electrically connected to the adaptive inductance type oscillator and to the saturation current detector; the output end of the saturation current detector is electrically connected to the constant current load and to the adaptive inductance type oscillator and the controller, the output end of the adaptive inductance type oscillator is electrically connected to the input end of the inductance voltage detector, and the output end of the inductance voltage detector is connected to the signal input end of the controller.

[0012] Preferably, the bidirectional programmable voltage source includes a transistor Q2, a transistor Q4, a comparator U4A and a pin J1, the base of the transistor Q2 is connected to the base of the transistor Q4 and then connected to pin 1 of the comparator U4A, the emitter of the transistor Q2 is connected to the emitter of the transistor Q4 and then connected to pin 2 of the comparator U4A, and connected to the U0 power supply input, pin 3 of the comparator U4A is connected to pin 4 of the pin J1, pin 5 of the pin J1 is connected to the collector of the transistor Q4, pin 1 of the pin J1 is connected to the DATA terminal output, pin 2 of the pin J1 is connected to the CLK terminal output, and pin 3 of the pin J1 is connected to the CS1 terminal output.

[0013] Preferably, the adaptive inductor oscillator comprises an inductor L X , relay K1, comparator U6A, pin header J2, inductor L2, resistor R 16 , resistor R 20 And the equivalent resistance R S , resistor R 20 The input end is connected to the emitter of transistor Q2, and the resistor R 20 The output of the comparator U6A is connected to pin 2 and connected to resistor R 16 The input end of the pin header J2, pins 5, 6, 7 and 8 are connected to the resistor R 16 The output end of the inductor L1 is connected to the input end of the inductor L1, the output end of the inductor L1 is connected to the input end of the relay K1, the output end of the relay K1 is connected to the input end of the inductor L2, and the output end of the inductor L2 is connected to the equivalent resistor R S The input terminal is connected to the 1st pin of the comparator U6A, and the equivalent resistance R SThe output end is connected to the emitter of the transistor Q2; the 8th pin of the comparator U6A is connected to the 5V power supply input and to the 3rd pin of the pin header J2; the 7th pin of the comparator U6A is connected to the resistor R 23 The input terminal, resistor R 23 The output end of is connected to pin 2 of inductor L2, to pin 4 of inductor L2 and to the input end of diode D3.

[0014] Preferably, the saturation current detector includes a chip U2, a comparator U3B, a comparator U3A, a transistor Q5, and a comparator U1B. The model of the chip U2 is NCP5181. The pin 2 of the chip U2 is connected to the resistor R 11 The input end of the chip U2 is connected to the 2nd pin of the comparator U3B, the 5th pin of the comparator U3B is connected to the emitter of the transistor Q2 and to the 1st pin of the comparator U1B, the 4th pin of the comparator U3B is connected to the emitter of the transistor Q5 and to the gate of the field effect transistor Q3, the 4th pin of the chip U2 is connected to the source of the field effect transistor Q3, and the drain of the field effect transistor Q3 is connected to the input end of the diode D1; the 3rd pin of the chip U2 is connected to the output end of the diode D2, the input end of the diode D2 is connected to the input end of the comparator U3A and to the output end of the resistor R2, and the input end of the resistor R2 is connected to the 5V power supply input.

[0015] Preferably, the constant current load includes a comparator U1A, a field effect transistor Q1, a resistor R3, a resistor R6 and a resistor R7, pin 1 of the comparator U1A is connected to the gate of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected to the output end of the diode D1, the source of the field effect transistor Q1 is connected to the output end of the resistor R7 and to pin 2 of the comparator U1A, the input end of the resistor R7 is connected to pin 6 of the comparator U3A, pin 3 of the comparator U1A is connected to the input end of the variable resistor VR1, the power input end of the variable resistor VR1 is connected to the 5V power input, and the power output end of the variable resistor VR1 is connected to pin 6 of the comparator U3A and to pin 3 of the chip U1.

[0016] Preferably, the inductor voltage detector includes a comparator U5A, a resistor R 17 , resistor R 18 , resistor R 15 and resistor R 19 , pin 3 of comparator U5A is connected to resistor R 17 The output terminal is connected to the resistor R 15 The input terminal, resistor R 17 The input end of the comparator U5A is connected to the 5th pin of the pin header J2; the 2nd pin of the comparator U5A is connected to the resistor R 18 The output terminal is connected to the resistor R 19 The input terminal, resistor R 18The input end is connected to the output end of relay K1; the resistor R 15 The output terminal and resistor R 19 The output end is connected to pin 1 of comparator U5A and then output.

[0017] Preferably, the controller adopts a single-chip microcomputer J3 as a main control chip, the model of the single-chip microcomputer J3 is STC15W402AS, pin 2 of the single-chip microcomputer J3 is connected to pin 1 of the comparator U5A, pin 3 of the single-chip microcomputer J3 is connected to pin 1 of the comparator U6A, pin 4 of the single-chip microcomputer J3 is connected to pin 5 of the pin header J2, and pin 6 of the single-chip microcomputer J3 is connected to the emitter of the triode Q2; pin 7 of the single-chip microcomputer J3 is connected to the output end of the diode D3, pin 20 of the single-chip microcomputer J3 is connected to pin 7 of the comparator U1B, pin 19 of the single-chip microcomputer J3 is connected to the output end of the resistor R3, and the input end of the resistor R3 is connected to the output end of the diode D1; pin 16 of the single-chip microcomputer J3 is connected to pin 1 of the pin header J1, pin 15 of the single-chip microcomputer J3 is connected to pin 2 of the pin header J1, pin 14 of the single-chip microcomputer J3 is connected to pin 3 of the pin header J1, and pins 11 and 12 of the single-chip microcomputer J3 are connected to the input end of the display.

[0018] This inductance characteristic parameter detector based on the enterprise use environment has the following beneficial effects:

[0019] 1. When measuring the inductance value, an adaptive inductance oscillator is used. After the inductance to be measured is connected, it automatically oscillates. The oscillation frequency of this circuit is independent of the operating voltage and works in a logical state. Therefore, it has strong anti-interference ability and stable operation. The standard inductor is connected in series to reduce the operating frequency. Therefore, the parasitic capacitance of the inductor has little effect on the measured value, the measurement accuracy is very high, and the measurement time is very fast (less than 10ms).

[0020] 2. Use the step method + delay method to measure the saturation current value I of the inductor S .

[0021] 3. Use a larger current to detect the equivalent internal resistance R of the inductor X , and uses incremental detection, R X The value is related to the increment of the measured voltage and has nothing to do with the accuracy of the voltage. Therefore, the measurement accuracy is very high, and the cold soldering state of the inductor can also be measured.

[0022] 4. Under high current and high voltage conditions in the operating environment, measure the withstand voltage characteristics, turn-to-turn short circuit and consistency state characteristics of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the overall circuit principle diagram of the present invention;

[0024] Figure 2 It is the working principle diagram of the oscillator of the present invention;

[0025] Figure 3 The working principle diagram of the counting N oscillator waveforms of the present invention;

[0026] Figure 4 The current characteristic diagram of the present invention when the inductance value is large and small;

[0027] Figure 5 This is a working principle diagram of the step method + delay method of the present invention.

[0028] In the figure: 1. Bidirectional programmable voltage source; 2. Adaptive inductor oscillator; 3. Inductor voltage detector; 4. Saturation current detector; 5. Constant current load; 6. Controller. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 , an inductance characteristic parameter detector based on an enterprise use environment, including a bidirectional programmable voltage source 1, an adaptive inductance type oscillator 2, an inductance voltage detector 3, a saturation current detector 4, a constant current type load 5 and a controller 6, the bidirectional programmable voltage source 1 is electrically connected to the adaptive inductance type oscillator 2, and is electrically connected to the saturation current detector 4; the output end of the saturation current detector 4 is electrically connected to the constant current type load 5, and is electrically connected to the adaptive inductance type oscillator 2 and the controller 6, the output end of the adaptive inductance type oscillator 2 is electrically connected to the input end of the inductance voltage detector 3, and the output end of the inductance voltage detector 3 is connected to the signal input end of the controller 6.

[0031] Wherein: the bidirectional programmable voltage source 1 includes a transistor Q2, a transistor Q4, a comparator U4A and a pin J1, the base of the transistor Q2 is connected to the base of the transistor Q4 and then connected to pin 1 of the comparator U4A, the emitter of the transistor Q2 is connected to the emitter of the transistor Q4 and then connected to pin 2 of the comparator U4A, and connected to the U0 power supply input, pin 3 of the comparator U4A is connected to pin 4 of the pin J1, pin 5 of the pin J1 is connected to the collector of the transistor Q4, pin 1 of the pin J1 is connected to the DATA terminal output, pin 2 of the pin J1 is connected to the CLK terminal output, and pin 3 of the pin J1 is connected to the CS1 terminal output; the bidirectional programmable voltage source 1 outputs a voltage of 0 to 5V under the control of the controller 6, and has the current pull-up and pull-down capabilities.

[0032] Wherein: The adaptive inductor oscillator 2 includes an inductor L X , relay K1, comparator U6A, pin header J2, inductor L2, resistor R 16 , resistor R 20 And the equivalent resistance R S , resistor R 20 The input end is connected to the emitter of transistor Q2, and the resistor R 20 The output of the comparator U6A is connected to pin 2 and connected to resistor R 16 The input end of the pin header J2, pins 5, 6, 7 and 8 are connected to the resistor R 16 The output end of the inductor L1 is connected to the input end of the inductor L1, the output end of the inductor L1 is connected to the input end of the relay K1, the output end of the relay K1 is connected to the input end of the inductor L2, and the output end of the inductor L2 is connected to the equivalent resistor R S The input terminal is connected to the 1st pin of the comparator U6A, and the equivalent resistance R S The output end of is connected to the emitter of transistor Q2; the 8th pin of comparator U6A is connected to the 5V power input and to the 3rd pin of pin header J2; the 7th pin of comparator U6A is connected to the resistor R 23 The input terminal, resistor R 23 The output end of the inductor L2 is connected to the 2nd foot of the inductor L2, and is connected to the 4th foot of the inductor L2 and the input end of the diode D3; the adaptive inductor oscillator 2 can detect the inductor L to be tested. X Value and equivalent resistance R S , access L X After that, it will automatically oscillate and output square wave, the oscillation frequency is the same as L X And the standard inductor L O related.

[0033] Among them: the saturation current detector 4 includes chip U2, comparator U3B, comparator U3A, transistor Q5, comparator U1B, the model of chip U2 is NCP5181, and the 2nd foot of chip U2 is connected to the resistor R 11 The input end of chip U2 is connected to pin 2 of comparator U3B, pin 5 of comparator U3B is connected to the emitter of transistor Q2 and to pin 1 of comparator U1B, pin 4 of comparator U3B is connected to the emitter of transistor Q5 and to the gate of field effect transistor Q3, pin 4 of chip U2 is connected to the source of field effect transistor Q3, and the drain of field effect transistor Q3 is connected to the input end of diode D1; pin 3 of chip U2 is connected to the output end of diode D2, the input end of diode D2 is connected to the input end of comparator U3A and to the output end of resistor R2, and the input end of resistor R2 is connected to the 5V power supply input.

[0034] Wherein: the constant current load 5 includes a comparator U1A, a field effect transistor Q1, a resistor R3, a resistor R6 and a resistor R7, pin 1 of the comparator U1A is connected to the gate of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected to the output end of the diode D1, the source of the field effect transistor Q1 is connected to the output end of the resistor R7 and is connected to pin 2 of the comparator U1A, the input end of the resistor R7 is connected to pin 6 of the comparator U3A, pin 3 of the comparator U1A is connected to the input end of the variable resistor VR1, the power input end of the variable resistor VR1 is connected to the 5V power input, and the power output end of the variable resistor VR1 is connected to pin 6 of the comparator U3A and to pin 3 of the chip U1.

[0035] Wherein: the inductor voltage detector 3 includes a comparator U5A, a resistor R 17 , resistor R 18 , resistor R 15 and resistor R 19 , pin 3 of comparator U5A is connected to resistor R 17 The output terminal is connected to the resistor R 15 The input terminal, resistor R 17 The input end of the comparator U5A is connected to the 5th pin of the pin header J2; the 2nd pin of the comparator U5A is connected to the resistor R 18 The output terminal is connected to the resistor R 19 The input terminal, resistor R 18 The input end is connected to the output end of relay K1; the resistor R 15 The output terminal and resistor R 19 The output end is connected to pin 1 of comparator U5A and then output.

[0036] Among them: controller 6 uses single-chip microcomputer J3 as the main control chip, the model of single-chip microcomputer J3 is STC15W402AS, the 2nd pin of single-chip microcomputer J3 is connected to the 1st pin of comparator U5A, the 3rd pin of single-chip microcomputer J3 is connected to the 1st pin of comparator U6A, the 4th pin of single-chip microcomputer J3 is connected to the 5th pin of pin header J2, the 6th pin of single-chip microcomputer J3 is connected to the emitter of triode Q2; the 7th pin of single-chip microcomputer J3 is connected to the output end of diode D3, the 20th pin of single-chip microcomputer J3 is connected to the 7th pin of comparator U1B, the 19th pin of single-chip microcomputer J3 is connected to the electric The output end of resistor R3 and the input end of resistor R3 are connected to the output end of diode D1; pin 16 of single-chip microcomputer J3 is connected to pin 1 of pin header J1, pin 15 of single-chip microcomputer J3 is connected to pin 2 of pin header J1, pin 14 of single-chip microcomputer J3 is connected to pin 3 of pin header J1, and pins 11 and 12 of single-chip microcomputer J3 are connected to the input end of the display; single-chip microcomputer J3 reads the signal from each pin, and after internal ADC conversion, displays the inductance value, equivalent resistance value of the inductor, saturation current value of the inductor, cold soldering status, inductor withstand voltage value and other information on the display.

[0037] The working principle of each circuit of the inductance characteristic parameter detector based on the enterprise use environment is as follows:

[0038] The working principle of adaptive inductor oscillator 2 can be found in Figure 2 , detect inductance L X Value and equivalent resistance R S When the relay K1 is closed, the diode D3 is cut off, and the single chip microcomputer J3 controls the output U of the bidirectional programmable voltage source 1. O =U CC / 2=2.5V, so when the inverting driver output is high level 5V, the inductor L X , inductance L2, equivalent resistance R S The voltage across the series branch is +2.5V, and the series branch current i L The nonlinearity increases, and at the same time, the U r Provides upper comparison voltage When the series branch current i L Increase to U S =U O +I L R S1 When the voltage is higher than 2.6V, the output of the inverting driver is low level 0V, L X , L O , R S1 The voltage across the series branch is -2.5V, and the series branch current i L The nonlinearity is reduced, and at the same time the U r Provides lower comparison voltage When the series branch current i L Reduce to U S =U O -I L R S1 When <2.4V, the inverting driver output is high level 5V and the oscillation process is repeated.

[0039] According to the three elements of the circuit Inductor to be measured L X The internal resistance is R X , the internal resistance of the standard inductor L2 is R O , the voltage across the inductor is U=±U CC / 2, the current changes from I L Rise to I H When , the expression is:

[0040] After sorting, you can get

[0041] Since the circuit is symmetrical, I L Rise to I HThe time of rising and falling is the same as that of falling, so the period T X =2t, we can get and After substitution, we can get It can be seen that it has nothing to do with the power supply voltage. Therefore, the period T of the detected square wave X The inductance value L can be obtained. The purpose of connecting the standard inductor L2 in series is to X <20uH when T X is very small, the delay time of the oscillation circuit affects T X , series standard inductor L2 = 100uH, R O = 0.05Ω, then reduce the frequency and increase T X accuracy.

[0042] In order to improve T X The detection accuracy is N T X Post-processing see Figure 3 , the microcontroller has a response time T when detecting the rising edge of the pulse E1 and T E2 , then the time t for counting N X =NT X +|T E1 -T E2 |, the period of each pulse is Because |T E1 -T E2 | is a very small value, and the N value is very large so the measurement error is almost 0.

[0043] Detect the inductor internal resistance R X Principle: Detect R X When the 7th pin of J3 is low level, the diode D3 is turned on and the output voltage of the inverting driver U P =5V, J3 controls the bidirectional programmable voltage source output U O =0~5V, so it can provide The detection current is obtained by using an inductor voltage detector R X The voltage across the two ends is amplified by K1 times, then U OX =K1IR X +U Y (U Y is the zero drift voltage of the op amp), then The current is R S (U OX -U Y )=K1R X (U S -U O ), in order to overcome the zero drift voltage U Y And the impact of voltage accuracy on the test results, first output UO =U O1 , then there exists R S (U OX1 -U Y )=K1R X (U S1 -U O1 ) relationship, and then output U O =U O2 , then there exists R S (U OX2 -U Y )=K1R X (U S2 -U O2 ) relationship, subtracting the two equations, we can get:

[0044] Therefore R X Value only with U O , U S , U OX The change is related to the operating voltage and the zero-drift voltage of the op amp, thereby improving the measurement accuracy.

[0045] The current I of the saturation current detector 4 S The detection principle is as follows: Detection I S When the relay K1 is released, the 7th pin of the single chip J3 is low level, and the diode D3 is turned on and the reverse driver output voltage U P =5V, single chip microcomputer J3 controls the bidirectional programmable voltage source 1 to output U O =0~0.6V, when the inductance value is large, the current rises slowly and linearly in the unsaturated region, and rises rapidly when approaching the saturated region. When the inductance value is small, the current rises rapidly and linearly in the unsaturated region, and rises faster when approaching the saturated region. The pulse width is very short, and if a single waveform is measured directly, it will cause a large error (see Figure 4 Therefore, the step method + delay method is used for measurement (see Figure 5 As shown); in-phase driver, field effect transistor Q3, resistor R S2 , diode D1, capacitor C1, resistor R S3 , release current detector, delay device, peak current detector form a flyback converter, when detecting, the single chip microcomputer J3 controls the bidirectional programmable voltage source 1 to output U O =0.3V, the field effect tube Q3 is turned on and the inductor current increases approximately linearly at the resistor R S2 When the pressure drop exceeds the set value U OAt t1, the peak current detector outputs a low level, and after a delay of about 1us, the field effect tube Q3 is turned off at t2. Therefore, ΔI is generated between the set value and the actual value. In the unsaturated region, the current increases linearly and the ΔI value is approximately the same, while after entering the saturated region, the ΔI value increases significantly.

[0046] Detection setting value U O The voltage is increased in steps of 0.1V, 0.2V, and 0.3V respectively. The working time t 01 ,t 02 ,t 03 For 10ms, we get ΔI1, ΔI2, ΔI3, etc. In the unsaturated region, the current increases linearly and the ΔI value is approximately the same. O When the inductance increases to a certain value, the ΔI value increases significantly and I = U O / R S2 is the saturation current value.

[0047] The 5V voltage is divided by the variable resistor VR1 to form U VR1 Provide to U 1A The voltage at the in-phase and inverting terminals is also approximately U VR1 , so the current of R7 is Since R7>>RS3, it can be simplified to When U VR1 =0V~5V, Q1 can provide I R7 = 0~0.25A current, discharge the current of C1 to prevent the voltage of C1 from being too high; resistors R3 and R6 form a voltage divider to convert the voltage of 0V~200V into 0V~5V and provide it to pin 19 of J3. After ADC conversion, the voltage value is displayed on the display;

[0048] In summary: This inductor characteristic parameter detector based on the enterprise use environment uses an adaptive inductor oscillator to measure the inductance value. It automatically oscillates after connecting the inductor to be measured. The oscillation frequency of this circuit is independent of the working voltage and works in a logical state. Therefore, it has strong anti-interference ability and stable operation. The standard inductor is connected in series to reduce the working frequency. Therefore, the parasitic capacitance of the inductor has little effect on the measured value, the measurement accuracy is very high, and the measurement time is very fast (less than 10ms); the step method + delay method is used to measure the saturation current value I of the inductor. S ; Use a larger current to detect the equivalent internal resistance R of the inductor X , and uses incremental detection, equivalent internal resistance R X The value is related to the increment of the measured voltage and has nothing to do with the accuracy of the voltage. Therefore, the measurement accuracy is very high, and the cold soldering state of the inductor can be measured at the same time. Under the conditions of high current and high voltage in the operating environment, the withstand voltage characteristics, turn-to-turn short circuit and consistency state characteristics of the inductor can be measured.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An inductance characteristic parameter detector based on an enterprise use environment, characterized in that: The invention comprises a bidirectional programmable voltage source (1), an adaptive inductance type oscillator (2), an inductance voltage detector (3), a saturation current detector (4), a constant current type load (5) and a controller (6). The bidirectional programmable voltage source (1) is electrically connected to the adaptive inductance type oscillator (2) and to the saturation current detector (4); the output end of the saturation current detector (4) is electrically connected to the constant current type load (5) and to the adaptive inductance type oscillator (2) and the controller (6); the output end of the adaptive inductance type oscillator (2) is electrically connected to the input end of the inductance voltage detector (3); the output end of the inductance voltage detector (3) is connected to the signal input end of the controller (6); The bidirectional programmable voltage source (1) includes a transistor Q2, a transistor Q4, a comparator U4A and a pin header J1, the adaptive inductor oscillator (2) includes an inductor LX, a relay K1, a comparator U6A, a pin header J2, an inductor L2, a resistor R16, a resistor R20 and an equivalent resistor RS, the saturation current detector (4) includes a chip U2, a comparator U3B, a comparator U3A, a transistor Q5, a comparator U1B, the constant current load (5) includes a comparator U1A, a field effect transistor Q1, a resistor R3, a resistor R6 and a resistor R7, and the inductor voltage detector (3) includes a comparator U5A, a resistor R17, a resistor R18, a resistor R15 and a resistor R19; The input end of the resistor R20 is connected to the emitter of the transistor Q2, the output end of the resistor R20 is connected to the 2nd pin of the comparator U6A, and is connected to the input end of the resistor R16, the 5th pin, the 6th pin, the 7th pin and the 8th pin of the pin header J2 are connected and connected to the output end of the resistor R16, and are connected to the input end of the inductor L1, the output end of the inductor L1 is connected to the input end of the relay K1, the output end of the relay K1 is connected to the input end of the inductor L2, the output end of the inductor L2 is connected to the input end of the equivalent resistor RS, and is connected to the 1st pin of the comparator U6A, and the output end of the equivalent resistor RS is connected to the emitter of the transistor Q2; the 8th pin of the comparator U6A is connected to the 5V power supply input, and is connected to the 3rd pin of the pin header J2, the 7th pin of the comparator U6A is connected to the input end of the resistor R23, the output end of the resistor R23 is connected to the 2nd pin of the inductor L2, and is connected to the 4th pin of the inductor L2 and to the input end of the diode D3; The model of the chip U2 is NCP5181. Pin 2 of the chip U2 is connected to the input end of the resistor R11 and to pin 2 of the comparator U3B. Pin 5 of the comparator U3B is connected to the emitter of the transistor Q2 and to pin 1 of the comparator U1B. Pin 4 of the comparator U3B is connected to the emitter of the transistor Q5 and to the gate of the field effect transistor Q3. Pin 4 of the chip U2 is connected to the source of the field effect transistor Q3, and the drain of the field effect transistor Q3 is connected to the input end of the diode D1; Pin 3 of the chip U2 is connected to the output end of the diode D2, the input end of the diode D2 is connected to the input end of the comparator U3A, and to the output end of the resistor R2, and the input end of the resistor R2 is connected to the 5V power supply input.

2. According to claim 1, the inductance characteristic parameter detector based on the enterprise use environment is characterized in that: The base of the transistor Q2 is connected to the base of the transistor Q4 and then connected to pin 1 of the comparator U4A. The emitter of the transistor Q2 is connected to the emitter of the transistor Q4 and then connected to pin 2 of the comparator U4A and connected to the power supply input of U0. Pin 3 of the comparator U4A is connected to pin 4 of the pin J1. Pin 5 of the pin J1 is connected to the collector of the transistor Q4. Pin 1 of the pin J1 is connected to the DATA terminal output. Pin 2 of the pin J1 is connected to the CLK terminal output. Pin 3 of the pin J1 is connected to the CS1 terminal output.

3. The inductance characteristic parameter detector based on the enterprise use environment according to claim 1 is characterized in that: Pin 1 of the comparator U1A is connected to the gate of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected to the output end of the diode D1, the source of the field effect transistor Q1 is connected to the output end of the resistor R7 and connected to pin 2 of the comparator U1A, the input end of the resistor R7 is connected to pin 6 of the comparator U3A, pin 3 of the comparator U1A is connected to the input end of the variable resistor VR1, the power input end of the variable resistor VR1 is connected to the 5V power input, and the power output end of the variable resistor VR1 is connected to pin 6 of the comparator U3A and connected to pin 3 of the chip U1.

4. The inductance characteristic parameter detector based on the enterprise use environment according to claim 1 is characterized in that: Pin 3 of the comparator U5A is connected to the output end of the resistor R17 and to the input end of the resistor R15, and the input end of the resistor R17 is connected to pin 5 of the pin header J2; Pin 2 of the comparator U5A is connected to the output end of the resistor R18 and to the input end of the resistor R19, and the input end of the resistor R18 is connected to the output end of the relay K1; The output end of the resistor R15 and the output end of the resistor R19 are connected to the pin 1 of the comparator U5A and then output.

5. The inductance characteristic parameter detector based on the enterprise use environment according to claim 1 is characterized in that: The controller (6) uses a single-chip microcomputer J3 as a main control chip. The model of the single-chip microcomputer J3 is STC15W402AS. Pin 2 of the single-chip microcomputer J3 is connected to pin 1 of the comparator U5A, pin 3 of the single-chip microcomputer J3 is connected to pin 1 of the comparator U6A, pin 4 of the single-chip microcomputer J3 is connected to pin 5 of the pin header J2, and pin 6 of the single-chip microcomputer J3 is connected to the emitter of the transistor Q2. Pin 7 of the single-chip computer J3 is connected to the output end of the diode D3, pin 20 of the single-chip computer J3 is connected to pin 7 of the comparator U1B, pin 19 of the single-chip computer J3 is connected to the output end of the resistor R3, and the input end of the resistor R3 is connected to the output end of the diode D1; Pin 16 of the single-chip microcomputer J3 is connected to pin 1 of the pin header J1, pin 15 of the single-chip microcomputer J3 is connected to pin 2 of the pin header J1, pin 14 of the single-chip microcomputer J3 is connected to pin 3 of the pin header J1, and pins 11 and 12 of the single-chip microcomputer J3 are connected to the input end of the display.

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