CN217133290U - Leakage inductance screening device for power high-frequency transformer - Google Patents
Leakage inductance screening device for power high-frequency transformer Download PDFInfo
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- CN217133290U CN217133290U CN202123236715.1U CN202123236715U CN217133290U CN 217133290 U CN217133290 U CN 217133290U CN 202123236715 U CN202123236715 U CN 202123236715U CN 217133290 U CN217133290 U CN 217133290U
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Abstract
The utility model provides a power high frequency transformer leakage inductance screening device, which realizes the screening of transformer leakage inductance through the simple electric connection and the structural arrangement of a transformer interface, a plurality of voltage detection interfaces, an external power supply interface, an on-off switch, a switch power supply and a test circuit board; the scheme has simple internal wiring and does not need to write software, so the device has low cost; parameters do not need to be set, and a tester can directly judge whether the transformer parameters meet the requirements only by monitoring the voltage numbers displayed on the voltage detection interface, so that the method is visual and convenient; the test circuit board simulates the actual operation condition, so that the precision deviation caused by parasitic inductance introduced by the external environment is reduced, and the measurement precision is high; and adopt the fixed transformer of transformer interface, to vary voltage device pin not damaged, and then the screening efficiency is high.
Description
Technical Field
The utility model relates to a transformer leakage inductance detection area especially relates to power high frequency transformer leakage inductance sieving mechanism.
Background
The flyback DCDC power supply has the advantages of simple structure, low cost, wide selectable input and output voltage range and the like, is widely applied to various devices of household appliances, industry and automobile electronics, and generally has the multi-path power supply output capability. In a flyback power supply circuit, a high-frequency transformer is an electric energy conversion device combining a power electronic technology and a high-frequency flux linkage technology.
The ideal high-frequency transformer is completely coupled between the primary winding and the secondary winding, and the energy of the high-frequency transformer has no energy loss in the transmission and numbering processes. However, in the actual process of manufacturing the transformer, due to the influence of various processes and other factors, the coupling between the primary winding and the secondary winding and the coupling between the secondary winding and the primary winding and the secondary winding are not tight, and the primary side leakage inductance and the secondary side leakage inductance of the multi-output transformer are generated. When the leakage inductance is too large, the cross regulation rate of the multi-output power supply is large. The cross regulation rate refers to that when the load of a certain power supply changes, the output voltage of other power supplies fluctuates greatly. Leakage inductance is an important parameter in the design of high frequency transformers.
The leakage inductance of the high-frequency transformer affects the energy transmission and voltage drop of the high-frequency transformer, and the overall performance of the product is affected. In severe cases, the power supply output voltage exceeds the withstand voltage of the back-end IC chip, causing functional failure. In the finished product stage, screening is performed by a test method, so that the later maintenance cost is high, and even the PCBA finished product is scrapped.
At present, the leakage inductance screening scheme of the finished high-frequency transformer mainly comprises the following two schemes: (1) and (4) selecting LCR bridge equipment, short-circuiting other windings which are not tested in a sampling inspection mode, testing leakage inductance parameters of the concerned output winding, and finally screening through the tested data. The method has complex process and low screening efficiency; (2) the transformer comprehensive tester is used for testing, and the method needs to purchase specific equipment and is high in cost.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's shortcoming, the utility model provides a technical problem lie in, current high-frequency transformer finished product leaks to feel screening scheme process complicated, the lower and higher scheduling problem of cost of screening efficiency.
In order to realize above-mentioned purpose and other relevant purpose, the utility model provides a power high frequency transformer leakage inductance sieving mechanism, include: the box includes: the first mounting port, the second mounting ports, the third mounting port and the fourth mounting port can be communicated with the inside and the outside of the box body; the transformer interface is arranged on the box body through the first mounting port and used for fixing a transformer to be screened; the voltage detection interfaces are respectively arranged on the box body through the second mounting ports; and each voltage detection interface comprises: a voltage detection terminal inside the case; the external power supply interface is arranged on the box body through the third mounting port and is used for externally connecting a power supply; the on-off switch is installed on the box body through the fourth installation port, is connected with the external power supply interface inside the box body through a first commercial power input line, and is used for controlling an external power supply to be connected into the power supply high-frequency transformer leakage inductance screening device; switching power supply locates inside the box, includes: an input terminal, a control terminal and an output terminal; the input end is connected with the external power supply interface inside the box body through a second commercial power input line and a third commercial power input line; the control end is connected with the on-off switch through a switch power supply control wire harness; the test circuit board is located in the box, include: the transformer interface fixing part is used for fixing the transformer interface so that the test circuit board can be connected with a transformer fixed on the transformer interface through the transformer interface; the winding output voltage terminals are respectively connected with the voltage detection terminals of the voltage detection interfaces in the box body through a plurality of voltage output wire harnesses and are used for respectively transmitting the acquired voltage analog signals of each winding of the transformer to be screened to the corresponding voltage detection interfaces; the voltage input terminal is connected with the output end of the switching power supply inside the box body through a voltage input wire harness; each voltage detection interface receives a voltage analog signal of a corresponding winding transmitted by the test circuit board through a voltage detection terminal, and displays a voltage value of the corresponding winding so as to allow a user to judge the leakage inductance condition of the winding.
In an embodiment of the present invention, each voltage detecting interface further includes: the signal processing module is used for converting the voltage analog signal of the corresponding winding transmitted by the test circuit board into a voltage digital signal; and the display module is connected with the signal processing module and used for displaying the voltage digital signal of the winding so as to judge the leakage inductance condition of the winding by a user.
In an embodiment of the present invention, each voltage detecting interface further includes: the current detection terminal is positioned in the box body, is connected with a plurality of winding output current terminals of the test circuit board through a plurality of current output wire harnesses and is used for receiving a current analog signal which is transmitted by the test circuit board and corresponds to one winding; the signal processing module is further used for converting a current analog signal of a corresponding winding transmitted by the test circuit board into a current digital signal; the display module is also used for displaying the current digital signals of the winding.
In an embodiment of the present invention, the apparatus further includes: the locking piece is fixed on the transformer interface and used for locking the transformer on the transformer interface when the control handle is put down; and when the control handle is lifted, the transformer and the transformer interface are unlocked.
In an embodiment of the present invention, the first mounting opening and the second mounting openings are disposed on the first panel of the box body; the third mounting port and the fourth mounting port are arranged on the second panel of the box body.
In an embodiment of the present invention, the first panel is provided with a plurality of circuit board fixing holes for fixing the test circuit board to the back of the first panel through bolts.
In an embodiment of the present invention, the box further includes a third panel, on which a plurality of fixing holes for fixing the switching power supply are formed, for fixing the switching power supply to the back of the third panel through bolts.
In an embodiment of the present invention, the voltage detection interface is a nixie tube.
In an embodiment of the utility model, first commercial power input line is the L live wire, second commercial power input line is PE earth connection, third commercial power input line and is the switching power supply live wire for N zero line and switching power supply control pencil.
In an embodiment of the present invention, the test circuit board is integrated with a flyback multiple output control power circuit.
As above, the utility model discloses a power high frequency transformer leakage inductance sieving mechanism has following beneficial effect: the utility model realizes the screening of the leakage inductance of the transformer through the simple electric connection and the structural arrangement of the transformer interface, the plurality of voltage detection interfaces, the external power supply interface, the on-off switch, the switch power supply and the test circuit board; the scheme has simple internal wiring and does not need to write software, so the device has low cost; parameters do not need to be set, and a tester can directly judge whether the transformer parameters meet the requirements only by monitoring the voltage numbers displayed on the voltage detection interface, so that the method is visual and convenient; the test circuit board simulates the actual operation condition, so that the precision deviation caused by parasitic inductance introduced by the external environment is reduced, and the measurement precision is high; and adopt the fixed transformer of transformer interface, to vary voltage device pin not damaged, and then the screening efficiency is high.
Drawings
Fig. 1 is a schematic diagram of an external structure of a leakage inductance screening device for a power high-frequency transformer according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an internal structure of a leakage inductance screening device for a power high-frequency transformer according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an internal structure of a leakage inductance screening device for a power high-frequency transformer according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a flyback multiple-output control power circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that in the following description, reference is made to the accompanying drawings which illustrate several embodiments of the invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "over," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," "retained," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The terms first, second, third, etc. are used herein to describe various elements, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the scope of the present invention.
Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," and/or "comprising," when used in this specification, specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.
The utility model realizes the screening of the leakage inductance of the transformer through the simple electric connection and the structural arrangement of the transformer interface, the plurality of voltage detection interfaces, the external power supply interface, the on-off switch, the switch power supply and the test circuit board; the scheme has simple internal wiring and does not need to write software, so the device has low cost; parameters do not need to be set, and a tester can directly judge whether the transformer parameters meet the requirements only by monitoring the voltage numbers displayed on the voltage detection interface, so that the method is visual and convenient; the test circuit board simulates the actual operation condition, so that the precision deviation caused by parasitic inductance introduced by the external environment is reduced, and the measurement precision is high; and adopt the fixed transformer of transformer interface, to vary voltage device pin not damaged, and then the screening efficiency is high.
Hereinafter, a specific implementation manner of the leakage inductance screening device for the power supply high-frequency transformer will be described with reference to the drawings in the specification.
As shown in fig. 1 to fig. 3, a schematic structural diagram of a leakage inductance screening device for a power supply high-frequency transformer according to an embodiment of the present invention is shown. The power high frequency transformer leakage inductance screening device comprises:
as shown in fig. 1, an external structure diagram of a leakage inductance screening device for a high-frequency transformer of a power supply, a box 11, includes: the first mounting port, the second mounting ports, the third mounting port and the fourth mounting port can be communicated with the inside and the outside of the box body; the transformer interface 12 is mounted on the box body 11 through the first mounting port and used for fixing a transformer to be screened outside the box body; a plurality of voltage detection interfaces 13, 14 and 15 (only three are taken as an example in the figure) which are respectively installed on the box body 11 through the second installation ports, and respectively display the voltage value of each winding of the transformer outside the box body so that a user can judge the leakage inductance condition of each winding; the external power supply interface 16 is installed on the box body 11 through the third installation port and is used for externally connecting a power supply outside the box body; and the on-off switch 17 is installed on the box body 11 through the fourth installation port and is used for controlling an external power supply to be connected or disconnected to the power supply high-frequency transformer leakage inductance screening device by opening or closing a switch outside the box body.
As shown in fig. 2, in order to illustrate the internal structure of the leakage inductance screening apparatus for a high-frequency transformer of a power supply, each of the voltage detection interfaces 13, 14, and 15 includes: a voltage detection terminal inside the case; the test circuit board 18, locate in the box, includes: a transformer interface fixing part (not shown in the figure) for fixing the transformer interface so that the test circuit board can be connected with the transformer fixed on the transformer interface through the transformer interface; the winding output voltage terminals are respectively connected with the voltage detection terminals of the voltage detection interfaces in the box body through a plurality of voltage output wire harnesses 19, 20 and 21 and are used for respectively transmitting the acquired voltage analog signals of each winding of the transformer to be screened to the corresponding voltage detection interfaces; a voltage input terminal connected to an output terminal of the switching power supply through voltage input harnesses 25 and 26 (two are illustrated as an example) inside the case;
as shown in fig. 3, which is an internal structure diagram of the leakage inductance screening device of the power high-frequency transformer, the on-off switch 17 is connected with the external power interface 16 through a first commercial power input line 28 inside the box body, and is used for controlling an external power to be connected to the leakage inductance screening device of the power high-frequency transformer; switching power supply 29 is located inside the box, includes: an input terminal, a control terminal and an output terminal; wherein, the input end is connected with the external power interface 16 through a second commercial power input line 30 and a third commercial power input line 31 inside the box body; the control end is connected with the on-off switch 17 through a switch power supply control wire harness 32; the output terminals are connected to voltage input terminals of a test circuit board inside the case through voltage input harnesses 25 and 26.
Each of the voltage detection interfaces 13, 14, and 15 receives a voltage analog signal of a corresponding winding transmitted from the test circuit board through a voltage detection terminal, and displays a voltage value of the corresponding winding, so that a user can determine a leakage inductance condition of the winding.
It should be noted that the number of each component of the leakage inductance screening device for the power supply high-frequency transformer can be set according to the requirement, and not only the number shown in fig. 1 to 3 is taken as an example; the number of the voltage detection interfaces, the winding output voltage terminals of the test circuit board and the number of the voltage output wire harnesses can be determined according to the windings of the transformer to be screened, and each winding is ensured to correspond to one winding output voltage terminal and one voltage detection interface; for example, if a three-winding transformer is to be screened, the number of the voltage detection interface, the winding output voltage terminal of the test circuit board, and the number of the voltage output wire harness are all three or more than three. And the circuit design of the test circuit board can also be set according to the number of windings of the transformer and the structural combination requirement, so that the simulation of the actual operation condition is ensured.
When the leakage inductance screening device of the high-frequency power transformer is applied to screening leakage inductance of the transformer, the transformer to be screened is fixed on a transformer interface, then an on-off switch is turned on, voltage values of windings of the transformer are respectively displayed on voltage detection interfaces 13, 14 and 15, the voltage values are compared with a theoretical design value range, whether the leakage inductance value of the corresponding output winding of the transformer meets the standard requirement is indirectly judged, and therefore whether the transformer is a qualified product is screened; the voltage value is matched with the inductance value, namely when the corresponding inductance of the winding of the transformer to be tested exceeds the range, the leakage inductance of the corresponding winding of the transformer is serious.
In one embodiment, the test circuit board 18 is integrated with a flyback multi-output control power circuit, and output voltage terminals are respectively disposed at corresponding positions of each winding of the inserted transformer; when the transformer is connected, the corresponding voltage signals of the corresponding windings are automatically output through the output voltage terminals.
For the circuit principle, in the flyback multi-output control power supply, when a single-path feedback control method is adopted, only one path of output voltage is subjected to closed-loop control, and when other output circuits are not subjected to feedback control. When the output voltage of the non-feedback loop is different from the output voltage of the feedback loop or the load carried by the feedback loop, the output voltage value of the non-feedback loop deviates. Based on the principle, the corresponding flyback multi-output control power circuit design can be carried out on the test circuit board; and then, whether the leakage inductance value of the corresponding output winding of the transformer meets the standard requirement is indirectly judged by comparing whether the actual output voltage value of the high-frequency power supply exceeds the theoretical design value range, so that whether the transformer is a qualified product is screened.
For example, when the transformer is connected to the test circuit board, the flyback multi-output control power supply circuit is as shown in fig. 4, and when the PWM control switch tube VT is turned on, the high-frequency transformer converts the electric energy into magnetic energy and stores the magnetic energy in the primary inductance Lm and the leakage inductance Lp of the transformer, and the current on the primary Np side increases linearly. At the moment when the PWM controls the switching tube VT to be turned off, the current on the primary side Np side rises to the maximum value Ipk. At the moment of turning off VT, the energy stored in the primary inductance Lm of the transformer will be transferred to the secondary windings N _ s1 and N _ s2, but the energy in the leakage inductance Lp will not be transferred to the secondary side, and the current on the primary side will be coupled to the secondary side. Among the currents transmitted to the secondary side, the output loop with smaller leakage inductance has the largest current, and if the output loop does not perform closed-loop feedback control, the output voltage of the loop will increase. If the output loop performs closed-loop feedback control, the output voltages of other loops will be reduced. Output voltage terminals are respectively arranged at the positions of three corresponding windings of the circuit and are used for respectively transmitting the collected voltage analog signals of each winding of the transformer to be screened to corresponding voltage detection interfaces so as to obtain voltage values; and then the control method can be obtained by controlling an external power supply to be connected into the flyback multi-output control power circuit.
Based on the above example, we continue to use, for example, a two-way output power source, as shown in fig. 4, and assume that the secondary side N s2 The output voltage of the winding is greater than N s1 Winding, N s1 The windings having closed-loop feedback control, N s2 The winding is not controlled by the output loop. Now will be N s2 Conversion of winding output loop parameters to N s1 In a feedback loop. Suppose that the secondary winding N s1 Corresponding leakage inductance of L K1 ，N s2 Corresponding leakage inductance of L K2 The turn ratio of the feedback loop to the open loop is N s1 /N s2 . Then N after conversion s2 Leakage inductance of winding is L K1 ×[N s1 /N s2 ] 2 。
Suppose N s2 The leakage inductance value of the winding being N s1 Twice the value of the leakage inductance of the winding, i.e. L k2 ＝2L K1 And the diode VD1 is VD2 is VD; then the voltage developed across the leakage inductance is equal and the voltage drop is Vo Vs- (VRL1+ VD 1). When the VT is controlled by PWM to be turned off, the current is distributed according to Faraday's law:
for the conclusions deduced above, since V o Is a function of time and, therefore, is not true in practice. But to understand the effect of leakage inductance on the cross-regulation rate. Suppose V o Is not time-varying.
According to the formula
Order to
The following can be obtained: i.e. i 1 ＝mt； (4)
According to the above equation, assume
Is greater than
Is provided with
Then N is s2 ＝10N s1 (ii) a So [ N s1 /N s2 ] 2 ＝1∶100；
From the formula (4) and the formula (2), the derivation is made
Thus flowing through
The initial current of (A) would be
50 times of current will result in
Much higher than 50V. When current i 1 And finally, when the current is increased to be equal to the load current plus the charging current for the capacitor, the feedback signal immediately controls the switch tube to be conducted, and the energy transmission is stopped. At this time, the other path will have a severe voltage overshoot.
In one embodiment, each voltage detection interface further comprises: the signal processing module is used for converting the voltage analog signal of the corresponding winding transmitted by the test circuit board into a voltage digital signal; and the display module is connected with the signal processing module and used for displaying the voltage digital signal of the winding so as to judge the leakage inductance condition of the winding by a user.
Preferably, the display module includes: the display screen is positioned outside the box body; the signal processing module is positioned in the box body and is convenient to be connected with the test circuit board.
In one embodiment, as shown in fig. 2, each voltage detection interface 13, 14, and 15 further includes: a current detection terminal inside the case; the test circuit board 18 includes: a plurality of winding output current terminals; each current detection terminal is connected with each winding output current terminal inside the box body through a plurality of current output wire harnesses 22, 23 and 24 (3 are taken as examples in the figure) and is used for receiving a current analog signal of a corresponding winding transmitted by the test circuit board; the signal processing module is further used for converting a current analog signal of a corresponding winding transmitted by the test circuit board into a current digital signal; the display module is also used for displaying the current digital signal of the winding as a leakage inductance detection reference.
In one embodiment, as shown in fig. 1, the apparatus further comprises: the locking piece 33 with the control handle is fixed on the transformer interface 12 and used for locking the transformer on the transformer interface and connecting the transformer with the test circuit board when the control handle is put down; and when the control handle is lifted, the transformer and the transformer interface are unlocked.
In an embodiment, as shown in fig. 1, the first mounting port and each second mounting port are disposed on a first panel 111 of the box body, and the transformer interface 12 is mounted on the first panel 111 of the box body 11 through the first mounting port, and is used for fixing a transformer to be screened; a plurality of voltage detection interfaces 13, 14 and 15 are respectively mounted on the first panel 111 of the box body through the second mounting ports; the interface part of the transformer interface 12 is matched with the size of a transformer pin and is positioned on the front surface of the first panel 111; the display portions of the voltage detection interfaces 13, 14, and 15 are located on the front surface of the first panel 111. The third mounting port and the fourth mounting port are arranged on the second panel 112 of the box body; the external power supply interface 16 is mounted on the second panel 112 of the box body through the third mounting port, and the on-off switch 17 is mounted on the second panel 112 through the fourth mounting port; wherein the interface portion of the external power interface 16 is located on the front surface of the second panel 112; the switch portion of the on-off switch 17 is located on the front surface of the second panel 112.
In one embodiment, the first panel has a plurality of circuit board fixing holes for fixing the test circuit board to the back surface of the first panel by bolts; for example, as shown in fig. 1, the first panel has four circuit board fixing holes for fixing the test circuit board to the back surface of the first panel 111 by four bolts 34.
In one embodiment, as shown in fig. 3, the box further includes a third panel 113, on which a plurality of switch power fixing holes are formed, for fixing the switch power to a back surface of the third panel 113 through bolts 35; for example, the third panel has four switching power fixing holes for fixing the switching power to the back surface of the third panel 113 by four bolts 35.
In one embodiment, the voltage detection interface is a nixie tube, including: the nixie tube display screen is positioned on the front side of the first panel 111 and can respectively display the output voltage value and the current value of the three windings of the transformer with the precision of 1%; the nixie tube back plate can process voltage and current analog signals output by the transformer into digital signals through the circuit board, and feed the digital signals back to the nixie tube display screen for display.
In an embodiment, as shown in fig. 3, the first commercial power input line 28 is an L-fire line, and is used for connecting the on-off switch 17 and the external power interface 16 inside the box body to control the external power to be connected to the leakage inductance screening device of the power high-frequency transformer; the second commercial power input line 30 is a PE ground wire, and the third commercial power input line 31 is an N zero line, and is used for connecting the input end of the switching power supply 29 and the external power supply interface 31 inside the box body; the switching power supply control harness 32 is a switching power supply live wire and is used for connecting the control end with the on-off switch 32.
For the convenience of understanding of those skilled in the art, the leakage inductance screening apparatus of the power supply high frequency transformer will now be further described with reference to the specific embodiments.
Example (b): a leakage inductance screening device for a three-winding power high-frequency transformer.
The power high frequency transformer leakage inductance screening device comprises: the device comprises a box body, a base locking piece, a lock catch, three nixie tubes, a three-hole port, an ON OFF ON-OFF switch, a test circuit board, three voltage harnesses, three current harnesses, two low-voltage 24V input harnesses, a switch power supply, three commercial power input lines and a switch power supply live wire;
wherein, the box includes: the first panel comprises a first mounting port and three second mounting ports, and the second panel comprises a third mounting port and a fourth mounting port, wherein the first mounting port and the three second mounting ports can be communicated with the inside and the outside of the box body; the base locking part is designed in the test circuit board and is installed on the first panel through the first installation port, the size of an interface of the base locking part is matched with that of a pin of a transformer, and the transformer can be placed on the base; the lock catch is connected to the base locking piece, when the lock catch is lifted, the transformer is placed on the base, and the lock catch is pressed down, so that the transformer can be fixed on the locking piece; when the transformer needs to be disassembled, the lock catch is lifted up again; and the three nixie tubes are arranged on the second panel through the fourth mounting port, and output voltage values and current values of the three windings of the transformer are respectively displayed with the precision of 1%. The nixie tube back plate can process 3 groups of voltage and current values output by the transformer into digital signals through the circuit board, and the digital signals are fed back to the nixie tube for display; the three-hole port is arranged on the second panel through the third mounting port, and an alternating current universal interface (comprising a live wire, a zero wire and a ground) is externally connected with a commercial power AC 220V; the 'ON OFF' ON-OFF switch is arranged ON the second panel through the fourth mounting port, and when an 'ON' button is pressed, the AC220V can be accessed into the testing device; when the "OFF" button is pressed, the AC220V may be disconnected from the testing device; and the switching power supply is arranged in the box body, is used for converting AC220V into DC24V power supply and is fixed with the box body shell through four screws. The test circuit board simulates the actual voltage output working condition of the transformer, can output the voltage and current values of 3 windings of the transformer, and is fixedly installed on the back of the first panel through 4M 4 screws; three voltage wire harnesses are used for connecting 3 groups of winding output voltage terminals of the transformer on the test circuit board and the upper terminals of the nixie tube back board together through the 3 groups of wire harnesses; the three current wire harnesses are used for testing the output voltage terminals of 3 groups of windings of the transformer on the circuit board and the terminals on the nixie tube back board and are connected together through the 3 groups of wire harnesses; two low-voltage 24V input wiring harnesses, wherein one is a low-voltage 24V input positive pole, and the other is a low-voltage 24V input negative pole, and DC24V is arranged between a test circuit board terminal and a switching power supply and is connected together through the wiring harnesses; three mains input lines: one of the two is a PE grounding wire, the other is an N zero wire, and the other is an L live wire; the PE grounding wire and the N zero line can be directly connected to the input end of the switching power supply through the outside; switching power live wire: and the on-off button of the on-off switch is used for controlling the on-off of the external live wire and the switching power supply.
The screening method implemented by the power supply high-frequency transformer leakage inductance screening device comprises the following steps:
(1) designing a test circuit board SCH and a PCB, and manufacturing a PCBA;
(2) firstly, mounting and fixing a transformer monomer on a base locking piece, wherein the base locking piece is designed in a test circuit board; the whole device is powered by an external commercial power AC220V, and the inside of the device is converted into a DC24V power supply required by a test circuit board through a switch power supply to supply power;
(3) the test circuit board simulates the working condition of the product circuit board during actual operation, after the test circuit board is electrified and works, the three windings of the transformer output corresponding voltage and current, the voltage and current analog quantity is connected with the nixie tube back plate through a wiring harness, the voltage and current analog quantity is processed into digital signals through the interior of the nixie tube back plate, and the numerical values can be displayed through the nixie tube;
(4) if the actual value of the leakage inductance of the output winding of the transformer exceeds the standard value, the output voltage of the output winding of the transformer also exceeds the standard value. The actual value of the leakage inductance of the output winding of the transformer is not more than the standard value, and the output voltage of the transformer can meet the design requirement. And comparing the numerical value on the nixie tube with the design value to judge whether the transformer is qualified.
To sum up, the leakage inductance screening device for the power supply high-frequency transformer of the utility model realizes the screening of the leakage inductance of the transformer through the simple electrical connection and the structural arrangement of the transformer interface, the plurality of voltage detection interfaces, the external power interface, the on-off switch, the switching power supply and the test circuit board; the scheme has simple internal wiring and does not need to write software, so the device has low cost; parameters do not need to be set, and a tester can directly judge whether the transformer parameters meet the requirements only by monitoring the voltage numbers displayed on the voltage detection interface, so that the method is visual and convenient; the test circuit board simulates the actual operation condition, so that the precision deviation caused by parasitic inductance introduced by the external environment is reduced, and the measurement precision is high; and adopt the fixed transformer of transformer interface, to vary voltage device pin not damaged, and then the screening efficiency is high. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a power high frequency transformer leakage inductance sieving mechanism which characterized in that includes:
the box includes: the first mounting port, the second mounting ports, the third mounting port and the fourth mounting port can be communicated with the inside and the outside of the box body;
the transformer interface is arranged on the box body through the first mounting port and used for fixing a transformer to be screened;
the voltage detection interfaces are respectively arranged on the box body through the second mounting ports; and each voltage detection interface comprises: a voltage detection terminal inside the case;
the external power supply interface is arranged on the box body through the third mounting port and is used for externally connecting a power supply;
the on-off switch is installed on the box body through the fourth installation port, is connected with the external power supply interface inside the box body through a first commercial power input line, and is used for controlling an external power supply to be connected into the power supply high-frequency transformer leakage inductance screening device;
switching power supply locates inside the box, includes: an input terminal, a control terminal and an output terminal; the input end is connected with the external power supply interface inside the box body through a second commercial power input line and a third commercial power input line; the control end is connected with the on-off switch through a switch power supply control wire harness;
the test circuit board is located in the box, include: the transformer interface fixing part is used for fixing the transformer interface so that the test circuit board can be connected with a transformer fixed on the transformer interface through the transformer interface; the winding output voltage terminals are respectively connected with the voltage detection terminals of the voltage detection interfaces in the box body through a plurality of voltage output wire harnesses and are used for respectively transmitting the acquired voltage analog signals of each winding of the transformer to be screened to the corresponding voltage detection interfaces; the voltage input terminal is connected with the output end of the switching power supply inside the box body through a voltage input wire harness;
each voltage detection interface receives a voltage analog signal of a corresponding winding transmitted by the test circuit board through a voltage detection terminal, and displays a voltage value of the corresponding winding so as to allow a user to judge the leakage inductance condition of the winding.
2. The power high frequency transformer leakage inductance screening apparatus of claim 1, wherein each voltage detection interface further comprises: the signal processing module is used for converting the voltage analog signal of the corresponding winding transmitted by the test circuit board into a voltage digital signal; and the display module is connected with the signal processing module and used for displaying the voltage digital signal of the winding so as to judge the leakage inductance condition of the winding by a user.
3. The power high frequency transformer leakage inductance screening apparatus of claim 2, wherein each voltage detection interface further comprises: the current detection terminal is positioned in the box body, is connected with a plurality of winding output current terminals of the test circuit board through a plurality of current output wire harnesses and is used for receiving a current analog signal which is transmitted by the test circuit board and corresponds to one winding;
the signal processing module is further used for converting a current analog signal of a corresponding winding transmitted by the test circuit board into a current digital signal; the display module is also used for displaying the current digital signals of the winding.
4. The power high frequency transformer leakage inductance screening device according to claim 1, further comprising: the locking piece is fixed on the transformer interface and used for locking the transformer on the transformer interface when the control handle is put down; and when the control handle is lifted, the transformer and the transformer interface are unlocked.
5. The power high-frequency transformer leakage inductance screening device according to claim 1, wherein the first mounting port and each second mounting port are provided on a first panel of the box body; the third mounting port and the fourth mounting port are arranged on the second panel of the box body.
6. The power high frequency transformer leakage inductance screening device according to claim 2, wherein the first panel is provided with a plurality of circuit board fixing holes for fixing the test circuit board to the back surface of the first panel by bolts.
7. The power high-frequency transformer leakage inductance screening device according to claim 5 or 6, wherein the box body further comprises a third panel, a plurality of switching power supply fixing holes are formed in the third panel, and the switching power supply fixing holes are used for fixing the switching power supply to the back surface of the third panel through bolts.
8. The power high frequency transformer leakage inductance screening device according to claim 1, wherein said voltage detection interface is a nixie tube.
9. The power supply high frequency transformer leakage inductance screening device according to claim 1, wherein the first commercial power input line is an L live wire, the second commercial power input line is a PE ground wire, the third commercial power input line is an N zero wire, and the switching power supply control harness is a switching power supply live wire.
10. The power high-frequency transformer leakage inductance screening device according to claim 1, wherein the test circuit board is integrated with a flyback multi-output control power circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236715.1U CN217133290U (en) | 2021-12-21 | 2021-12-21 | Leakage inductance screening device for power high-frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236715.1U CN217133290U (en) | 2021-12-21 | 2021-12-21 | Leakage inductance screening device for power high-frequency transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347838A (en) * | 2023-12-05 | 2024-01-05 | 黑龙江瑞兴科技股份有限公司 | Outdoor monitoring and collecting extension device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347838A (en) * | 2023-12-05 | 2024-01-05 | 黑龙江瑞兴科技股份有限公司 | Outdoor monitoring and collecting extension device |
| CN117347838B (en) * | 2023-12-05 | 2024-02-20 | 黑龙江瑞兴科技股份有限公司 | Outdoor monitoring and collecting extension device |
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