CN204422680U - A kind of inductance saturation characteristic test circuit - Google Patents
A kind of inductance saturation characteristic test circuit Download PDFInfo
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- CN204422680U CN204422680U CN201520082414.3U CN201520082414U CN204422680U CN 204422680 U CN204422680 U CN 204422680U CN 201520082414 U CN201520082414 U CN 201520082414U CN 204422680 U CN204422680 U CN 204422680U
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Abstract
The utility model relates to electric and electronic technical field, specifically a kind of inductance saturation characteristic test circuit, the utility model compared with the existing technology, circuit is simple and reliable, do not need expensive signal generating apparatus, whole system only uses a joint lithium battery power supply, energy-conserving and environment-protective and being convenient for carrying, test voltage can size adjustment, adapts to various different Devices to test and uses; Use big capacity electrolyte capacitor as dash current power-supply unit, utilize its voltage stabilization and can provide moment high-power high-current feature, and through current-limiting resistance charging, prevent test instantaneous power be shorted and cause power supply to damage; Use the Metal-Oxide Semiconductor field effect transistor of low on-resistance as switching tube, there is conduction voltage drop low, the advantage that measuring error is little; Make Current Transformer measure current waveform, have reaction velocity fast, measuring accuracy is high, makes simple, feature with low cost.
Description
Technical field
The utility model relates to electric and electronic technical field, specifically a kind of inductance saturation characteristic test circuit.
Background technology
In inverter type welder and field of switch power, inductance belongs to a kind of critical components and parts, and the key technical indexes of inductance has inductance value and the saturation current of inductance.When inductance is saturated, the inductance value of inductance can sharply reduce, and is equivalent to direct short-circuit, and this often produces fatefulue injury to circuit.Therefore, for circuit reliability design, avoid that inductance is saturated has considerable meaning.
At present, the inductance value testing apparatus of inductance has LRC electric bridge etc., but this equipment usually can only when very small area analysis, and test the inductance value size of inductance, in big current situation, the characteristic of inductance then cannot be measured.
The method of existing inductance measuring saturation characteristic generally has electric current and voltage method, this method needs to continue through electric current to test the characteristic of inductance to inductance, it is high and power consumption is large to equipment requirement, method after some improvement then has circuit and control mode is complicated, the defect that demand equipment is too much.
Therefore, need to design a kind of test problem using circuit simple and reliable, with low cost to solve inductance saturation characteristic.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art, provides a kind of test problem using circuit simple and reliable, with low cost to solve inductance saturation characteristic.
In order to achieve the above object, the utility model devises a kind of inductance saturation characteristic test circuit, comprises power supply, switch, resistance, electric capacity, diode, triode, is characterized in that: after the DRC pin serial connection resistance one of chip, point three tunnels respectively with one end of switch, the VCC pin of one end of electric capacity one and chip connects, and the other end of switch is connected with the positive pole of battery, and the TC pin of chip is connected with one end of electric capacity two, the CII pin of chip divide three tunnels respectively with one end of resistance two, one end of slide rheostat and sliding end connect, and the SWE pin of chip divides two-way to be connected with one end of inductance and the negative electrode of diode respectively, the plus earth of diode, the other end of slide rheostat, the other end of inductance, after one end of one end of resistance three and button connects, be connected with VCC power supply, the other end of resistance three divide four tunnels respectively with one end of inductance to be measured, electrochemical capacitor three, the positive pole of electrochemical capacitor four and electrochemical capacitor five connects, the other end of inductance to be measured is connected with the drain electrode of switching tube, after the gate pole resistance in series five of switching tube, two-way is divided to be connected with the other end of button and one end of resistance four respectively, the source electrode of switching tube is connected with primary winding one end of current transformer, after the secondary coil two ends parallel connection detection resistance of current transformer, be connected with oscillograph, the negative pole of battery, the other end of electric capacity one, the GND pin of chip, the other end of electric capacity two, the other end of resistance two, the negative pole of electrochemical capacitor three, the negative pole of electrochemical capacitor four, the negative pole of electrochemical capacitor five, the other end of resistance four and primary winding other end ground connection of current transformer.
The model of described chip is MC34063.
Described switching tube is Metal-Oxide Semiconductor field effect transistor.
Described switching tube is that multiple Metal-Oxide Semiconductor field effect transistor is in parallel.
Compared with the existing technology, circuit is simple and reliable for the utility model, and do not need expensive signal generating apparatus, whole system only uses a joint lithium battery power supply, energy-conserving and environment-protective and being convenient for carrying, and test voltage can size adjustment, adapts to various different Devices to test and uses; Use big capacity electrolyte capacitor as dash current power-supply unit, utilize its voltage stabilization and can provide moment high-power high-current feature, and through current-limiting resistance charging, prevent test instantaneous power be shorted and cause power supply to damage; Use the Metal-Oxide Semiconductor field effect transistor of low on-resistance as switching tube, there is conduction voltage drop low, the advantage that measuring error is little; Make Current Transformer measure current waveform, have reaction velocity fast, measuring accuracy is high, makes simple, feature with low cost.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Now by reference to the accompanying drawings the utility model is described further.
See Fig. 1, the utility model devises a kind of inductance saturation characteristic test circuit, comprises power supply, switch, resistance, electric capacity, diode, triode.After DRC pin serial connection resistance one R1 of chip U1, point three tunnels respectively with one end of interrupteur SW 1, one end of electric capacity one C1 and the VCC pin of chip U1 connect, the other end of interrupteur SW 1 is connected with the positive pole of battery B1, the TC pin of chip U1 is connected with one end of electric capacity two C2, the CII pin of chip U1 divide three tunnels respectively with one end of resistance two R2, one end of slide rheostat VR1 and sliding end connect, the SWE pin of chip U1 divides two-way to be connected with one end of inductance L 1 and the negative electrode of diode D1 respectively, the plus earth of diode D1, the other end of slide rheostat VR1, the other end of inductance L 1, after one end of resistance three R3 and one end of button SW2 connect, be connected with VCC power supply, the other end of resistance three R3 divide four tunnels respectively with one end of inductance L 2 to be measured, electrochemical capacitor three C3, the positive pole of electrochemical capacitor four C4 and electrochemical capacitor five C5 connects, the other end of inductance L 2 to be measured is connected with the drain electrode of switch transistor T 1, after gate pole resistance in series five R5 of switch transistor T 1, two-way is divided to be connected with the other end of button SW2 and one end of resistance four R4 respectively, the source electrode of switch transistor T 1 is connected with primary winding one end of Current Transmit, after the secondary coil two ends parallel connection detection resistance R6 of Current Transmit, be connected with oscillograph, the negative pole of battery B1, the other end of electric capacity one C1, the GND pin of chip U1, the other end of electric capacity two C2, the other end of resistance two R2, the negative pole of electrochemical capacitor three C3, the negative pole of electrochemical capacitor four C4, the negative pole of electrochemical capacitor five C5, the other end of resistance four R4 and primary winding other end ground connection of Current Transmit.
In the utility model, the model of chip U1 is MC34063.
Switch transistor T 1 is that Metal-Oxide Semiconductor field effect transistor or multiple Metal-Oxide Semiconductor field effect transistor are in parallel.
Inductance saturation characteristic test circuit completes test, step 1 successively as follows, and close a switch SW1, and wait electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5 charge; Step 2, is connected to oscillographic probe and detects resistance two ends, and oscillograph is set to edge and single Trigger Function; Step 3, presses the button SW2, catches and detects resistance both end voltage waveform, observation waveform flex point; Step 4, according to formula: saturation current=current transformer change * knee voltage/detection resistance, calculates the saturation current numerical value of inductance.
Operationally, chip U1's the utility model boosts, and its objective is provides larger momentary pulse energy to rear end electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5, realizes the measurement of high-power inductance saturation current.
Electric capacity two C2 is the concussion frequency electric capacity of chip U1, regulates the sliding end of slide rheostat VR1 can regulate VCC voltage, measures in order to the saturation current testing different capacity grade inductance.
After battery B1 boost in voltage, charged to electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5 by you R2 of resistance, electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5 are jumbo electrolytic condenser, adopt mode in parallel to reduce equivalent series resistance.
Button SW2 is trigger switch, and when pressing the button SW2, the gate pole of switch transistor T 1 becomes high level, switch transistor T 1 triggering and conducting, and electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5 are discharged by inductance L 2 to be measured.Because the capacity of electrochemical capacitor three C3, electrochemical capacitor four C4 and electrochemical capacitor five C5 is very large, therefore inductance L 2 two ends to be measured are equivalent to access constant pressure source in this condition, now the electric current of inductance L to be measured 2 li linearly rises, when electric current rises to the saturation current of inductance L 2 to be measured, because inductance value declines rapidly, therefore the electric current of inductance L to be measured 2 li can sharply rise.This current waveform is reflected by Current Transmit and detection resistance, use oscilloprobe to connect and detect resistance R6 two ends, the waveform recorded is the current waveform of inductance L to be measured 2 li, by observation waveform flex point, can read the saturation current value of inductance very easily.
Owing to adding resistance two R2 in this circuit, therefore electric capacity by inductance short circuit dischange limit the size of electric power outputting current, serve the effect that protection power source prevents power supply scaling loss.
The selection of switch transistor T 1 should select the Metal-Oxide Semiconductor field effect transistor of ultralow conducting resistance, or uses the mode of multiple Metal-Oxide Semiconductor field effect transistor parallel connection, to reduce on-state voltage drop.
Claims (4)
1. an inductance saturation characteristic test circuit, comprise power supply, switch, resistance, electric capacity, diode, triode, it is characterized in that: after the DRC pin serial connection resistance one (R1) of chip (U1), point three tunnels respectively with one end of switch (SW1), one end of electric capacity one (C1) and the VCC pin of chip (U1) connect, the other end of switch (SW1) is connected with the positive pole of battery (B1), the TC pin of chip (U1) is connected with one end of electric capacity two (C2), the CII pin of chip (U1) divide three tunnels respectively with one end of resistance two (R2), one end of slide rheostat (VR1) and sliding end connect, the SWE pin of chip (U1) divides two-way to be connected with one end of inductance (L1) and the negative electrode of diode (D1) respectively, the plus earth of diode (D1), the other end of slide rheostat (VR1), the other end of inductance (L1), after one end of resistance three (R3) and one end of button (SW2) connect, be connected with VCC power supply, the other end of resistance three (R3) divide four tunnels respectively with one end of inductance to be measured (L2), electrochemical capacitor three (C3), the positive pole of electrochemical capacitor four (C4) and electrochemical capacitor five (C5) connects, the other end of inductance to be measured (L2) is connected with the drain electrode of switching tube (T1), after the gate pole resistance in series five (R5) of switching tube (T1), two-way is divided to be connected with the other end of button (SW2) and one end of resistance four (R4) respectively, the source electrode of switching tube (T1) is connected with primary winding one end of current transformer (CT), behind secondary coil two ends parallel connection detection resistance (R6) of current transformer (CT), be connected with oscillograph, the negative pole of battery (B1), the other end of electric capacity one (C1), the GND pin of chip (U1), the other end of electric capacity two (C2), the other end of resistance two (R2), the negative pole of electrochemical capacitor three (C3), the negative pole of electrochemical capacitor four (C4), the negative pole of electrochemical capacitor five (C5), the other end of resistance four (R4) and primary winding other end ground connection of current transformer (CT).
2. a kind of inductance saturation characteristic test circuit according to claim 1, is characterized in that: the model of described chip (U1) is MC34063.
3. a kind of inductance saturation characteristic test circuit according to claim 1, is characterized in that: described switching tube (T1) is Metal-Oxide Semiconductor field effect transistor.
4. a kind of inductance saturation characteristic test circuit according to claim 1, is characterized in that: described switching tube (T1) is multiple Metal-Oxide Semiconductor field effect transistor parallel connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520082414.3U CN204422680U (en) | 2015-02-05 | 2015-02-05 | A kind of inductance saturation characteristic test circuit |
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| CN201520082414.3U CN204422680U (en) | 2015-02-05 | 2015-02-05 | A kind of inductance saturation characteristic test circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614614A (en) * | 2015-02-05 | 2015-05-13 | 上海和宗焊接设备制造有限公司 | Inductance saturation characteristic testing circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614614A (en) * | 2015-02-05 | 2015-05-13 | 上海和宗焊接设备制造有限公司 | Inductance saturation characteristic testing circuit and method |
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