CN217425645U - Transformer dotted terminal detection device based on square wave generator - Google Patents
Transformer dotted terminal detection device based on square wave generator Download PDFInfo
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- CN217425645U CN217425645U CN202221248443.9U CN202221248443U CN217425645U CN 217425645 U CN217425645 U CN 217425645U CN 202221248443 U CN202221248443 U CN 202221248443U CN 217425645 U CN217425645 U CN 217425645U
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Abstract
The invention discloses a device for detecting the same-name end of a transformer based on a square wave generator, which comprises the square wave generator, a driving module and a detection module, wherein the driving module is used for driving the square wave generator to generate a driving signal; the square wave generator is used for generating alternating square wave signals; the driving module is used for driving the detection module and the transformer to be detected; the detection module is used for detecting whether the ports of the primary side and the secondary side of the connected transformer to be detected are homonymy ends or not through the on and off of the bulb. Compared with the prior art, the device for detecting the homonymous end of the transformer based on the square wave generator can quickly judge the homonymous end of the transformer, has low requirements on the electrician theory and the operating skill of operators, does not need to frequently disconnect and connect wires, greatly improves the detection efficiency, and is very favorable for batch production, use and maintenance of the transformer.
Description
Technical Field
The invention relates to the field of electronic detection of transformers, in particular to a transformer dotted terminal detection device based on a square wave generator.
Background
The judgment of the homonymous end of the transformer can provide a reference point for the transformation voltage, the transformation current and the transformation phase of the transformer, and along with the application of the transformer in a large quantity, the method has very important significance for quickly and accurately judging the homonymous end of the transformer particularly in the processes of batch production, use and maintenance.
The inventor finds that the prior art for judging the same-name end of the transformer has higher requirements on the electrician theory and the operation skill of operators, needs 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 be frequently disconnected and connected, so that the device adopting the prior art is low in efficiency and is not beneficial to batch production, use and maintenance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a device for detecting the homonymous terminal of a transformer based on a square wave generator, which has the specific technical scheme that,
the device comprises a square wave generator, a driving module and a detection module;
the square wave generator is a square wave generator circuit comprising an operational amplifier and is used for generating alternating square wave signals; comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and an operational amplifier CF; one end of a resistor R1 is connected with a power supply VCC, the other end of a resistor R1, one end of a resistor R2 and one end of a resistor R3 are connected with a non-inverting input end of an operational amplifier CF, the other end of the resistor R2 is connected with a power supply ground, an inverting input end of the operational amplifier CF and one end of a resistor R4 are connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with the power supply ground, the output end of the operational amplifier and the other end of the resistor R3 are connected with the other end of a resistor R4, and a connection point of the operational amplifier and the resistor R3 is set as a port Sm and used for outputting alternating square wave signals;
the driving module is used for driving the detection module and the transformer to be detected; comprises a buffer resistor R5 and a MOS transistor Q3; the MOS tube Q3 is an N-channel MOSFET; one end of a buffer resistor R5 and the grid electrode of the MOS tube Q3 are connected with the port Sm, the other end of the buffer resistor R5 is connected with a power ground, the drain electrode of the MOS tube Q3 is connected with a power VCC, and the source electrode of the MOS tube Q3 is set as the 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 transformer 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 the bulb D1 and one end of the bulb D2 are connected with the port Sn, the other end of the bulb D1 is set as a port S _ port1, the other end of the bulb D2 is set as a port P _ port1, one end of the current-limiting resistor R11 is set as a port P _ port2, one end of the current-limiting resistor R22 is set as a port S _ port2, and the other end of the current-limiting resistor R11 and the other end of the 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 transformer 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 transformer to be tested.
Further, at least one of the bulb D1 and the bulb D2 is replaced by an indicator light consisting of two anti-parallel light emitting diodes.
Further, at least one of the current limiting resistor R11 and the current limiting resistor R22 is replaced by an equivalent adjustable resistor.
The transformer homonymous terminal detection device based on the square wave generator has the advantages that the transformer homonymous terminal can be quickly judged, the requirements on the electrician theory and the operating skill of operators are not high, frequent disconnection and connection are not needed, the detection efficiency is greatly improved, and the transformer homonymous terminal detection device is very beneficial to batch production, use and maintenance of transformers.
Drawings
Fig. 1 is a typical schematic diagram of a transformer dotted terminal detection device implemented based on a square wave generator according to the present invention.
Fig. 2 shows another alternative embodiment of the present invention for replacing the bulb.
Fig. 3 is a schematic diagram of a square wave generator according to the present invention.
Fig. 4 is a schematic diagram of the driving module according to the present invention.
Fig. 5 is a schematic diagram of a local equivalent operation circuit of the method for detecting the dotted terminal of the transformer.
Fig. 6 is a schematic diagram of another local equivalent operation circuit of the method for detecting the dotted terminal of the transformer.
Fig. 7 is a schematic diagram of a local equivalent operation circuit of the method for detecting the different name terminal of the transformer.
Fig. 8 is a schematic diagram of another local equivalent operation circuit of the method for detecting the synonym termination of the transformer according to the invention.
Fig. 9 shows another alternative embodiment of the current limiting resistor according to the present invention.
Fig. 10 is a specific example of the method for detecting the dotted terminals of the transformer according to the present invention.
Fig. 11 is a specific example of the method for detecting the different name terminals of the transformer 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, which is a typical schematic diagram of a transformer dotted terminal detection device implemented based on a square wave generator according to the present invention, the transformer dotted terminal detection device includes a square wave generator, a driving module and a detection module;
the square wave generator is a square wave generator circuit comprising an operational amplifier and is used for generating alternating square wave signals; comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and an operational amplifier CF; one end of a resistor R1 is connected with a power supply VCC, the other end of a resistor R1, one end of a resistor R2 and one end of a resistor R3 are connected with a non-inverting input end of an operational amplifier CF, the other end of the resistor R2 is connected with a power supply ground, an inverting input end of the operational amplifier CF and one end of a resistor R4 are connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with the power supply ground, the output end of the operational amplifier and the other end of the resistor R3 are connected with the other end of a resistor R4, and a connection point of the operational amplifier and the resistor R3 is set as a port Sm and used for outputting alternating square wave signals;
the driving module is used for driving the detection module and the transformer to be detected; comprises a buffer resistor R5 and a MOS transistor Q3; the MOS tube Q3 is an N-channel MOSFET; one end of a buffer resistor R5 and the grid electrode of the MOS tube Q3 are connected with the port Sm, the other end of the buffer resistor R5 is connected with a power ground, the drain electrode of the MOS tube Q3 is connected with a power VCC, and the source electrode of the MOS tube Q3 is set as the 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 transformer 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 the bulb D1 and one end of the bulb D2 are connected with the port Sn, the other end of the bulb D1 is set as a port S _ port1, the other end of the bulb D2 is set as a port P _ port1, one end of the current-limiting resistor R11 is set as a port P _ port2, one end of the current-limiting resistor R22 is set as a port S _ port2, and the other end of the current-limiting resistor R11 and the other end of the 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 transformer 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 transformer 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 is a schematic diagram of the square wave generator of the present invention, wherein the driving module can be regarded as an equivalent load, and is connected between the port Sm and the power ground, so as to form a typical square wave generator circuit including an operational amplifier, and the port Sm outputs an alternating square wave signal.
As shown in fig. 4, which is a schematic diagram of the driving module according to the present invention, assuming that an equivalent load is additionally connected to the port Sn, the working process is,
(1) when the port Sm is at a high level, which acts on the buffer resistor R5 and the gate of the MOS transistor Q3, a forward bias is provided to the gate and the source of the MOS transistor Q3, so that the MOS transistor Q3 is turned on, and the port Sn outputs a high level;
(2) when the port Sm is at a low level, which acts on the buffer resistor R5 and the gate of the MOS transistor Q3, the gate and the source of the MOS transistor Q3 cannot be provided with a forward bias, so that the MOS transistor Q3 is turned off, and the port Sn outputs a low level;
in short, the input signal and the output signal of the driving module are both square waves.
As shown in fig. 5, a schematic diagram of a local equivalent operation circuit for detecting the dotted terminal method of the transformer of the present invention;
in the working process, in the process of converting the signal on the port Sn from the low level to the high level, because of the discreteness of electronic components of the detection module, two branches consisting of the primary side and the secondary side of the transformer T1 to be detected are connected, one branch always works in advance, and if the primary side branch of the transformer T1 works in advance and the inductance of the primary side inhibits the increase of current, an induced voltage Up is generated between the two ends of the transformer, a voltage Us is induced on the secondary side through the transformer T1, the primary side branch and the secondary side branch of the transformer T1 form a loop shown by a dotted line in fig. 5, and the generated quantitative relation is that the loop is shown by the kirchhoff voltage law
Due to U R11 And U R22 Equality, then equation (1) can be further simplified to
When the transformation ratio of the transformer T1 is not large, namely the difference between Up and Us is not large, Up and Us are in a quantitative relation of subtraction, only a small circulation current can be generated in the loop, and the loop is not enough to light the bulb, namely the bulb D1 and the bulb D2 are not lighted;
similarly, when the secondary side branch of the transformer T1 operates first, the analysis process and the result are similar to those described above, and detailed description is omitted.
Referring to fig. 6, another schematic diagram of a local equivalent operating circuit for detecting the dotted terminal of the transformer according to the present invention, the working process is shown in fig. 5, referring to and continuing the working process of fig. 5, in the process of converting the signal at the port Sn from the high level to the low level, if the primary side branch of the transformer T1 works in advance, the primary side inductor will suppress the reduction of the current, an induced voltage Up will be generated between the two ends of the primary side branch, a voltage Us will be induced on the secondary side through the transformer T1, the primary side branch and the secondary side branch of the transformer T1 form a loop as shown by the dotted line in fig. 6, and the generated quantitative relationship is kirchhoff's voltage law
Due to U R11 And U R22 Equality, equation (3) can be further simplified to
When the transformation ratio of the transformer T1 is not large, namely the difference between Up and Us is not large, Up and Us are in a quantitative relation of subtraction, only a small circulation current can be generated in the loop, and the loop is not enough to light the bulb, namely the bulb D1 and the bulb D2 cannot light;
similarly, when the secondary branch of the transformer T1 operates first, neither the bulb D1 nor the bulb D2 will be lit.
As shown in fig. 7, a schematic diagram of a local equivalent operation circuit for detecting the end-to-end difference of the transformer according to the present invention is shown, wherein the working process is that, in the process of converting the signal at the port Sn from the low level to the high level, if the primary side branch of the transformer T1 works in advance and the primary side inductance inhibits the increase of the current, an induced voltage Up is generated between the two ends of the transformer, a voltage Us is induced at the secondary side through the transformer, the primary side branch and the secondary side branch of the transformer T1 form a loop as shown by a dotted line in fig. 7, and the quantitative relationship is generated according to kirchhoff's voltage law
Due to U R11 And U R22 Equal, equation (5) can be further simplified to
The quantitative relationship of the addition of the Up and the Us can generate circulation in the loop, so that the bulb D1 and the bulb D2 are both lighted;
similarly, when the secondary branch of the transformer T1 operates first, the bulb D1 and the bulb D2 are both turned on, and detailed description thereof is omitted.
Referring to fig. 8, another schematic diagram of a local equivalent operating circuit for detecting the different-name termination of the transformer according to the present invention is shown, wherein the working process is as follows, referring to and continuing the working process of fig. 7, when the signal at the port Sn is converted from high level to low level, the primary side branch of the transformer T1 is assumed to work in advance, the primary side inductance will suppress the reduction of the current, an induced voltage Up will be generated between the two ends, a voltage Us will be induced at the secondary side through the transformer T1, the primary side branch and the secondary side branch of the transformer T1 form a loop as shown by the dotted line in fig. 8, and the generated quantitative relationship is 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 branch of the transformer T1 operates first, the bulb D1 and the bulb D2 are both turned on, and detailed description thereof is omitted.
In summary, when the detection module emits light, it means that the transformer ports connected to the ports P _ port1 and S _ port1 of the detection module are synonyms; when the bulb of the detection module does not emit light, the transformer ports connected to the port P _ port1 and the port S _ port1 of the detection module are the same name.
As shown in fig. 9, in another scheme of replacing the current-limiting resistor according to the present invention, at least one of the current-limiting resistor R11 and the current-limiting resistor R22 is replaced with an equivalent adjustable resistor, when the transformation ratio of the transformer T1 is too large, referring to fig. 5 or fig. 6, that is, the transformer T1 is a dotted terminal method, according to the analysis of the formula (1) or the formula (3), a large loop current is generated, and the bulb is turned on, so that the dotted terminal method and the dotted terminal method of the transformer T1 cannot be distinguished; therefore, the adjustable resistance value of the side with less turns in the two branches of the transformer T1 is increased, and the current in the loop can be reduced, so as to achieve the same effect as that described in fig. 5 or fig. 6; in this way, after the resistance value of the adjustable resistor is adjusted, referring to fig. 7 or fig. 8, that is, the transformer T1 is a synonym termination method, according to the analysis of formula (5) or formula (7), because the quantitative relationship of the mutual superposition of Up and Us can also generate a larger current in the loop, this scheme can also achieve the same effect as that described in fig. 7 or fig. 8.
As shown in fig. 10, a specific example of the method for detecting the same-name terminals of the transformer according to the present invention is shown, the connection is performed according to the above principle, after power is turned on, the light bulb D1 and the light bulb D2 are not lit, which indicates that the ports of the transformer connected to the ports P _ port1 and S _ port1 of the detection module are the same-name terminals.
As shown in fig. 11, in an embodiment of the method for detecting the different-name terminal of the transformer 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 turned on, which indicates that the transformer ports connected to the ports P _ port1 and S _ port1 of the detection module are different-name terminals.
Claims (3)
1. A transformer dotted terminal detection device based on a square wave generator is characterized by comprising the square wave generator, a driving module and a detection module;
the square wave generator is a square wave generator circuit comprising an operational amplifier and is used for generating alternating square wave signals; comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and an operational amplifier CF; one end of a resistor R1 is connected with a power supply VCC, the other end of a resistor R1, one end of a resistor R2 and one end of a resistor R3 are connected with a non-inverting input end of an operational amplifier CF, the other end of the resistor R2 is connected with a power supply ground, an inverting input end of the operational amplifier CF and one end of a resistor R4 are connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with the power supply ground, the output end of the operational amplifier and the other end of the resistor R3 are connected with the other end of a resistor R4, and a connection point of the operational amplifier and the resistor R3 is set as a port Sm and used for outputting alternating square wave signals;
the driving module is used for driving the detection module and the transformer to be detected; comprises a buffer resistor R5 and a MOS transistor Q3; the MOS tube Q3 is an N-channel MOSFET; one end of a buffer resistor R5 and the grid electrode of the MOS tube Q3 are connected with the port Sm, the other end of the buffer resistor R5 is connected with a power ground, the drain electrode of the MOS tube Q3 is connected with a power VCC, and the source electrode of the MOS tube Q3 is set as the 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 transformer 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 the bulb D1 and one end of the bulb D2 are connected with the port Sn, the other end of the bulb D1 is set as a port S _ port1, the other end of the bulb D2 is set as a port P _ port1, one end of the current-limiting resistor R11 is set as a port P _ port2, one end of the current-limiting resistor R22 is set as a port S _ port2, and the other end of the current-limiting resistor R11 and the other end of the 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 transformer 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 transformer to be tested.
2. The transformer dotted terminal detection device realized based on the square wave generator of claim 1, wherein at least one of the light bulb D1 and the light bulb D2 is replaced by an indicator light consisting of two anti-parallel light emitting diodes.
3. The device for detecting the dotted terminals of the transformer based on the square-wave generator of claim 1, wherein at least one of the current limiting resistor R11 and the current limiting resistor R22 is replaced by an equivalent adjustable resistor.
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| CN202221248443.9U CN217425645U (en) | 2022-05-24 | 2022-05-24 | Transformer dotted terminal detection device based on square wave generator |
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| CN202221248443.9U CN217425645U (en) | 2022-05-24 | 2022-05-24 | Transformer dotted terminal detection device based on square wave generator |
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