CN217521339U - EMI inductance dotted terminal detection device based on 555 chip realization - Google Patents
EMI inductance dotted terminal detection device based on 555 chip realization Download PDFInfo
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- CN217521339U CN217521339U CN202221248371.8U CN202221248371U CN217521339U CN 217521339 U CN217521339 U CN 217521339U CN 202221248371 U CN202221248371 U CN 202221248371U CN 217521339 U CN217521339 U CN 217521339U
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- 208000032365 Electromagnetic interference Diseases 0.000 description 87
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Abstract
The invention discloses an EMI inductance dotted terminal detection device based on a 555 chip, which comprises a 555 multivibrator and a detection module; the 555 multivibrator is used for generating an alternating square wave signal; the detection module is used for detecting whether the ports of the primary side and the secondary side of the connected EMI inductor to be detected are homonymous terminals or not through the on and off of the bulb. Compared with the existing device, the EMI inductor homonymous terminal detection device based on the 555 chip can quickly judge the EMI inductor homonymous terminal, has low requirements on the electrician theory and the operation skill of operators, does not need to be frequently disconnected and wired, greatly improves the detection efficiency, and is very favorable for batch production, use and maintenance of the EMI inductors.
Description
Technical Field
The invention relates to the field of electronic detection of EMI (electro-magnetic interference) inductors, in particular to an EMI inductor homonymy end detection device based on a 555 chip.
Background
With the mass emergence and wide popularization of electronic equipment, computers and household appliances, the noise interference of a power grid is increasingly serious and becomes a public nuisance; an EMI (Electromagnetic Interference, EMI for short) filter is widely popularized as an effective tool for dealing with the public nuisance, wherein the EMI inductor is a common mode inductor and is a core device of the finished EMI filter; in the processes of batch production, use and maintenance, the method has very important significance for quickly and accurately judging the homonymous terminals of the EMI inductors.
The inventor finds that the prior art for judging the homonymous terminal of the EMI inductor has higher requirements on the electrician theory and the operation skill of an operator, needs to use instruments and equipment such as an alternating current power supply, a direct current power supply, a voltmeter, an ammeter or an oscilloscope, and needs to frequently disconnect and connect wires, so that the device adopting the prior art is low in efficiency and is very unfavorable for batch production, use and maintenance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an EMI inductance homonymous terminal detection device based on a 555 chip, and the specific technical scheme is that,
the device comprises a 555 multivibrator and a detection module;
the 555 multivibrator is a multivibrator circuit comprising a 555 chip and is used for generating alternating square wave signals; the chip comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a 555 chip; one end of a VCC pin, a RST pin and a resistor R1 of the 555 chip is connected with a power VCC, the other end of a DIS pin and a resistor R1 of the 555 chip is connected with one end of a resistor R2, the other end of a THR pin of the 555 chip, a TRI pin of the 555 chip and the other end of a resistor R2 are connected with one end of a capacitor C1, a CON pin of the 555 chip is connected with one end of a capacitor C2, the other end of a GND pin and a capacitor C1 of the 555 chip and the other end of a capacitor C2 are connected with a power ground, and an OUT pin of the 555 chip is set as a port Sn and used for driving the detection module in the form of a switching signal;
the detection module is used for detecting whether the ports of the primary side and the secondary side of the connected EMI inductor to be detected are homonymous terminals or not through the on and off of the bulb; comprises a bulb D1, a bulb D2, a current limiting resistor R11 and a current limiting resistor R22; the resistance values of the current limiting resistor R11 and the current limiting resistor R22 are equal; one end of a bulb D1 and one end of a bulb D2 are connected with the port Sn, the other end of a bulb D1 is connected with a set port S _ port1, the other end of a bulb D2 is connected with a set port P _ port1, one end of a current-limiting resistor R11 is connected with a set port P _ port2, one end of a current-limiting resistor R22 is connected with a set port S _ port2, and the other end of the current-limiting resistor R11 and the other end of a current-limiting resistor R22 are connected with a power ground; in addition, the port P _ port1 and the port P _ port2 are respectively used for connecting two ports on the primary side of the EMI inductor to be tested, and the port S _ port1 and the port S _ port2 are respectively used for connecting two ports on the secondary side of the EMI inductor to be tested.
Further, at least one of the light bulbs D1 and D2 is replaced by an indicator light consisting of two anti-parallel light-emitting diodes.
Further, the current limiting resistor R11 and the current limiting resistor R22 are replaced by equivalent adjustable resistors.
The device for detecting the homonymous end of the EMI inductor based on the 555 chip has the advantages that the homonymous end of the EMI inductor can be quickly judged, the requirements on the electrician theory and the operating skill of an operator are not high, frequent disconnecting and wiring are not needed, and the device is very favorable for batch production, use and maintenance of the EMI inductor.
Drawings
Fig. 1 is a typical schematic diagram of an EMI inductor dotted terminal detection device implemented based on a 555 chip.
Fig. 2 shows another alternative of the present invention for replacing the bulb.
FIG. 3 is a schematic diagram of a 555 multivibrator according to the present invention.
FIG. 4 is a schematic diagram of a local equivalent operating circuit of the same name termination method for detecting EMI inductance according to the present invention.
FIG. 5 is a schematic diagram of another circuit for detecting EMI inductance dotted termination according to the present invention.
FIG. 6 is a schematic diagram of a local equivalent operating circuit of the EMI detection inductive alias termination method of the present invention.
FIG. 7 is a schematic diagram of another partial equivalent operating circuit of the EMI detection inductive alias termination method of the present invention.
Fig. 8 shows another alternative embodiment of the current limiting resistor according to the present invention.
FIG. 9 shows an embodiment of the same-name termination method for detecting EMI according to the present invention.
FIG. 10 shows an embodiment of the method for detecting EMI inductive alias termination according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1, a typical schematic diagram of an EMI inductor dotted terminal detection device implemented based on a 555 chip according to the present invention includes a 555 multivibrator and a detection module;
the 555 multivibrator is a multivibrator circuit comprising a 555 chip and is used for generating alternating square wave signals; the chip comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a 555 chip; one end of a VCC pin, a RST pin and a resistor R1 of the 555 chip is connected with a power supply VCC, the other end of a DIS pin and a resistor R1 of the 555 chip is connected with one end of a resistor R2, the other end of a THR pin of the 555 chip, a TRI pin of the 555 chip and the other end of a resistor R2 are connected with one end of a capacitor C1, a CON pin of the 555 chip is connected with one end of a capacitor C2, the other end of a GND pin and a capacitor C1 of the 555 chip and the other end of a capacitor C2 are connected with a power ground, and an OUT pin of the 555 chip is set as a port Sn and used for driving the detection module in the form of a switching signal;
the detection module is used for detecting whether the ports of the primary side and the secondary side of the connected EMI inductor to be detected are homonymous terminals or not through the on and off of the bulb; comprises a bulb D1, a bulb D2, a current limiting resistor R11 and a current limiting resistor R22; the resistance values of the current limiting resistor R11 and the current limiting resistor R22 are equal; one end of a bulb D1 and one end of a bulb D2 are connected with the port Sn, the other end of a bulb D1 is connected with a set port S _ port1, the other end of a bulb D2 is connected with a set port P _ port1, one end of a current-limiting resistor R11 is connected with a set port P _ port2, one end of a current-limiting resistor R22 is connected with a set port S _ port2, and the other end of the current-limiting resistor R11 and the other end of a current-limiting resistor R22 are connected with a power ground; in addition, the port P _ port1 and the port P _ port2 are respectively used for connecting two ports on the primary side of the EMI inductor to be tested, and the port S _ port1 and the port S _ port2 are respectively used for connecting two ports on the secondary side of the EMI inductor to be tested.
As shown in fig. 2, in another alternative of the present invention, at least one of the light bulb D1 and the light bulb D2 is replaced by an indicator light composed of two anti-parallel light emitting diodes.
Fig. 3 shows a schematic diagram of the 555 multivibrator of the present invention, wherein the detection module can be regarded as an equivalent load and is connected between the port Sn and the power ground, so as to form a typical multivibrator circuit comprising a 555 chip, and the port Sn outputs an alternating square wave signal.
FIG. 4 is a schematic diagram of a local equivalent operating circuit of the same-name termination method for detecting EMI inductance according to the present invention;
the working process is that in the process of converting a signal on a port Sn from a low level to a high level, due to the discreteness of components, two branch circuits formed by a primary side and a secondary side of an EMI inductor EMI _ L to be detected are connected, one branch circuit works in advance, and if the primary side branch circuit of the EMI inductor EMI _ L works in advance, the inductance of the primary side of the EMI inductor EMI _ L can inhibit the increase of current, an induction voltage Up can be generated between the two ends of the branch circuits, a voltage Us is induced on the secondary side through the EMI inductor EMI _ L, the primary side branch circuit and the secondary side branch circuit of the EMI inductor EMI _ L form a loop shown by a dotted line in figure 4, and the generated quantitative relation is that according to kirchhoff's voltage law
Due to U R11 And U R22 Equality, then equation (1) can be further simplified to
Generally, the EMI inductance is similar to a transformer with a transformation ratio of 1, namely, the difference between Up and Us is not large, the Up and Us are in a quantitative relation of subtraction, only a small circulating current can be generated in a loop, and the loop is not enough to light a bulb, namely, a bulb D1 and a bulb D2 are not lighted;
similarly, when the secondary side branch of the EMI inductor EMI _ L operates first, the analysis process and the result are similar to those described above, and detailed description is omitted.
Referring to FIG. 5, another schematic diagram of a local equivalent operating circuit for detecting the same-name termination of the EMI inductor according to the present invention is shown, wherein the working process is as follows, referring to and continuing the working process of FIG. 4, in the process of converting the signal at the port Sn from the high level to the low level, it is also assumed that the primary side branch of the EMI inductor EMI _ L works in advance, and the primary side inductor of the EMI inductor EMI _ L inhibits the reduction of current, so that an induced voltage Up is generated between the two ends of the primary side branch, and a voltage Us is induced on the secondary side through the EMI inductor EMI _ L, the primary side branch and the secondary side branch of the EMI inductor EMI _ L form a loop as shown by a dotted line in FIG. 5, and according to kirchhoff's voltage law, the generated quantitative relationship is that
Due to U R11 And U R22 Equality, equation (3) can be further simplified to
Generally, the EMI inductance is similar to a transformer with a transformation ratio of 1, namely, the difference between Up and Us is not large, the Up and Us are in a quantitative relation of subtraction, only a small circulating current can be generated in a loop, and the loop is not enough to light a bulb, namely, a bulb D1 and a bulb D2 are not lighted;
similarly, when the secondary side branch of the EMI inductor EMI _ L operates first, the analysis process and the result are similar to those described above, and detailed description is omitted.
As shown in fig. 6, a schematic diagram of a local equivalent operation circuit for detecting the EMI induction different name termination method according to the present invention is shown, wherein the working process is that, in the process of converting the signal on the port Sn from the low level to the high level, if the primary side branch of the EMI inductor EMI _ L is working in advance, and the inductor on the primary side of the EMI inductor EMI _ L inhibits the increase of the current, an induced voltage Up is generated between the two ends of the primary side branch, and a voltage Us is induced on the secondary side through the EMI inductor, the primary side branch and the secondary side branch of the EMI inductor EMI _ L form a loop as shown by a dotted line in fig. 6, and the generated quantitative relationship is that according to kirchhoff's voltage law, the generated quantitative relationship is that
Due to U R11 And U R22 Equal, equation (5) can be further simplified to
The quantitative relationship between Up and Us is added, which generates a circulating current in the loop, so that the lamp D1 and the lamp D2 are both turned on, and similarly, when the secondary side branch of the EMI inductor EMI _ L operates first, the lamp D1 and the lamp D2 are both turned on, and details are not repeated.
Referring to fig. 7, another schematic diagram of a local equivalent operating circuit according to the present invention for detecting the different name termination of the EMI inductor, the working process of which is shown in fig. 6, wherein in the process of converting the signal at the port Sn from the high level to the low level, it is assumed that the primary side branch of the EMI inductor EMI _ L is working in advance, and the primary side inductor of the EMI inductor EMI _ L will suppress the reduction of the current, so that an induced voltage Up will be generated between the two ends thereof, and a voltage Us will be induced at the secondary side through the EMI inductor EMI _ L, and the primary side branch and the secondary side branch of the EMI inductor EMI _ L form a loop, and the generated quantitative relationship is expressed as kirchhoff's voltage law
Due to U R11 And U R22 Equality, equation (7) can be further simplified to
The quantitative relationship between Up and Us is additive, and circulation current is generated in the loop, namely, the bulb D1 and the bulb D2 are both lighted;
similarly, when the secondary side branch of the EMI inductor EMI _ L first works, the light bulb D1 and the light bulb D2 are all lighted up, and details are not repeated.
In summary, when the detection module emits light, the EMI inductor EMI _ L port connected to the port P _ port1 and the port S _ port1 of the detection module is a synonym port; when the bulb of the detection module does not emit light, the EMI inductor EMI _ L port connected to the port P _ port1 and the port S _ port1 of the detection module is the same name.
As shown in fig. 8, in another scheme of replacing the current-limiting resistor according to the present invention, the current-limiting resistor R11 and the current-limiting resistor R22 are replaced by equivalent adjustable resistors, and the resistances of the current-limiting resistor R11 and the current-limiting resistor R22 should be increased or carefully reduced when the device is used, so as to prevent the accident that the power supply is damaged or the EMI inductor is burned out due to carelessness when the device uses a high-voltage power supply or a low-power EMI inductor.
As shown in fig. 9, a specific example of the method for detecting the same-name terminals of EMI inductors according to the present invention is shown, wherein the connection is performed according to the above principle, and after power is turned on, the light bulb D1 and the light bulb D2 are not lit, which illustrates that the EMI inductor EMI _ L ports connected to the port P _ port1 and the port S _ port1 of the detection module are the same-name terminals.
As shown in fig. 10, in an embodiment of the method for detecting EMI inductance different-name terminals according to the present invention, the connection is performed according to the above principle, and after power is turned on, both the light bulb D1 and the light bulb D2 are lit, which indicates that the EMI inductance EMI _ L ports connected to the ports P _ port1 and S _ port1 of the detection module are different-name terminals.
Claims (3)
1. A555-chip-based EMI inductance dotted terminal detection device is characterized by comprising a 555 multivibrator and a detection module;
the 555 multivibrator is a multivibrator circuit comprising a 555 chip and is used for generating alternating square wave signals; the chip comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a 555 chip; one end of a VCC pin, a RST pin and a resistor R1 of the 555 chip is connected with a power VCC, the other end of a DIS pin and a resistor R1 of the 555 chip is connected with one end of a resistor R2, the other end of a THR pin of the 555 chip, a TRI pin of the 555 chip and the other end of a resistor R2 are connected with one end of a capacitor C1, a CON pin of the 555 chip is connected with one end of a capacitor C2, the other end of a GND pin and a capacitor C1 of the 555 chip and the other end of a capacitor C2 are connected with a power ground, and an OUT pin of the 555 chip is set as a port Sn and used for driving the detection module in the form of a switching signal;
the detection module is used for detecting whether the ports of the primary side and the secondary side of the connected EMI inductor to be detected are homonymous terminals or not through the on and off of the bulb; comprises a bulb D1, a bulb D2, a current limiting resistor R11 and a current limiting resistor R22; the resistance values of the current limiting resistor R11 and the current limiting resistor R22 are equal; one end of a bulb D1 and one end of a bulb D2 are connected with the port Sn, the other end of a bulb D1 is connected with a set port S _ port1, the other end of a bulb D2 is connected with a set port P _ port1, one end of a current-limiting resistor R11 is connected with a set port P _ port2, one end of a current-limiting resistor R22 is connected with a set port S _ port2, and the other end of the current-limiting resistor R11 and the other end of a current-limiting resistor R22 are connected with a power ground; in addition, the port P _ port1 and the port P _ port2 are respectively used for connecting two ports on the primary side of the EMI inductor to be tested, and the port S _ port1 and the port S _ port2 are respectively used for connecting two ports on the secondary side of the EMI inductor to be tested.
2. The EMI induction dotted terminal detection device realized on the basis of the 555 chip as recited in claim 1, wherein at least one of the bulbs D1 and D2 is replaced by an indicator light consisting of two anti-parallel light emitting diodes.
3. The EMI inductor dotted terminal detection device based on a 555 chip as claimed in claim 1, wherein the current limiting resistor R11 and the current limiting resistor R22 are replaced by equivalent adjustable resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221248371.8U CN217521339U (en) | 2022-05-24 | 2022-05-24 | EMI inductance dotted terminal detection device based on 555 chip realization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221248371.8U CN217521339U (en) | 2022-05-24 | 2022-05-24 | EMI inductance dotted terminal detection device based on 555 chip realization |
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| CN217521339U true CN217521339U (en) | 2022-09-30 |
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| CN202221248371.8U Expired - Fee Related CN217521339U (en) | 2022-05-24 | 2022-05-24 | EMI inductance dotted terminal detection device based on 555 chip realization |
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Granted publication date: 20220930 |