CN212341341U

CN212341341U - Frequency conversion module on-line testing instrument

Info

Publication number: CN212341341U
Application number: CN202020892754.3U
Authority: CN
Inventors: 李献勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-01-12
Anticipated expiration: 2030-05-25

Abstract

The utility model relates to a frequency conversion module on-line measuring instrument, it includes: the instrument comprises an instrument body, a red meter pen and a black meter pen, wherein the red meter pen and the black meter pen are arranged on the outer side of the instrument body; the test module comprises a signal generator, the signal generator is provided with a first output end and a second output end, the first output end is connected with the black pen, and the black pen is connected with the grounding terminal; the second output end is connected with a red meter pen, and the red meter pen is connected with the three-way upper half-bridge driving signal input terminal and/or the three-way lower half-bridge driving signal input terminal; and the indication module comprises at least three prompt units, each prompt unit corresponds to one of the drive signals, and each prompt unit is used for being conducted with the output end of the frequency conversion module and the power supply of the frequency conversion mainboard. The testing instrument can judge the six-way drive of the frequency conversion module and the soft fault on the power tube, and can also determine whether the frequency change is normal.

Description

Frequency conversion module on-line testing instrument

Technical Field

The utility model belongs to the technical field of the test technique and specifically relates to a frequency conversion module on-line measuring instrument is related to.

Background

The frequency conversion module, also called frequency conversion power module, is widely used in frequency converters and frequency conversion air conditioners, and is easily damaged in the operation process, for example: when the running current suddenly increases suddenly due to the turn-to-turn short circuit of the motor winding of the load circuit compressor, the frequency conversion module is damaged due to overcurrent and overload, and the frequency conversion module has more pins, is difficult to disassemble and is expensive, so that the accurate judgment of whether the frequency conversion module is damaged is very important.

At present, a universal meter is commonly used for testing whether a frequency conversion module is damaged, however, the universal meter can only carry out preliminary judgment on hardware on six drivers and power tubes in the frequency conversion module when short circuit or open circuit faults occur, but cannot carry out judgment on the six drivers of the frequency conversion module and soft faults on the power tubes; in addition, the above test needs to be performed in a state that the power supply of the frequency conversion main board is powered off, so that it is impossible to test whether the frequency change of the frequency conversion module is normal when the frequency conversion module works at a low frequency or a high frequency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a can judge the soft trouble on six way drives of frequency conversion module and the power tube is provided, and can also confirm whether normal frequency conversion module on-line measuring instrument of its frequency variation.

In order to solve the above problems, the utility model adopts the following technical proposal:

the utility model provides a frequency conversion module on-line test instrument, be provided with input and output on the frequency conversion module, the input of frequency conversion module includes: three-way half-bridge drive signal input terminal, three-way lower half-bridge drive signal input terminal and grounding terminal; the frequency conversion module online test instrument comprises: the instrument comprises an instrument body, a red meter pen and a black meter pen, wherein the red meter pen and the black meter pen are arranged on the outer side of the instrument body, and a test module and an indication module are arranged in the instrument body;

the test module comprises a signal generator, a first output end and a second output end are arranged on the signal generator, the first output end is connected with the black pen, and the black pen is connected with the grounding terminal; the second output end is connected with the red stylus, and the red stylus is connected with the three-way upper half-bridge driving signal input terminal and/or the three-way lower half-bridge driving signal input terminal;

the indicating module comprises at least three prompting units, each prompting unit corresponds to one driving signal and is used for being conducted with the output end of the frequency conversion module and the power supply of the frequency conversion mainboard.

As a further improvement of the present invention, the first half-bridge driving signal input terminal of three paths is: UP input terminal, VP input terminal, WP input terminal, half-bridge drive signal input terminal under three routes is: a UN input terminal, a VN input terminal, and a WN input terminal.

As a further improvement of the present invention, the test module further comprises: the resistor I, the resistor II and the excitation triode;

the first output end of the test module is connected with the input end of the first resistor, the first output end of the first resistor is connected with the base electrode of the excitation triode, the collector electrode of the excitation triode is connected with the black pen interface module, the emitter electrode of the excitation triode is connected with the second output end of the first resistor through a second resistor, and the emitter electrode of the excitation triode is grounded.

As a further improvement of the present invention, the test module further comprises: and the second output end of the test module is connected with the red meter pen interface module through the third resistor.

As a further improvement of the present invention, the test module further comprises: the voltage reduction module is respectively connected with the second output end of the signal generator and the third resistor.

As a further improvement of the utility model, the indication module includes three suggestion unit, and first suggestion unit, second suggestion unit and third suggestion unit are parallelly connected, first suggestion unit second suggestion unit with third suggestion unit all be used for with frequency conversion module's output with the power of frequency conversion mainboard switches on.

As a further improvement of the utility model, the indication module still includes the partial pressure unit, the one end of partial pressure unit with first suggestion unit the second suggestion unit with the third suggestion unit is established ties, the other end with the power of frequency conversion mainboard is connected.

As a further improvement of the present invention, the indication module further includes an input switch, the input switch is respectively connected to the voltage dividing unit and the power supply of the variable frequency main board, and the input switch can be switched between a first gear and a second gear;

the change-over switch is used for enabling the voltage division unit to be connected with the negative electrode of the power supply on the variable-frequency mainboard through the input change-over switch when the change-over switch is in the first gear; the change-over switch is also used for connecting the voltage division unit with the power supply anode on the frequency conversion mainboard through the input change-over switch when the change-over switch is in the second gear.

As a further improvement of the present invention, the first prompting unit, the second prompting unit and the third prompting unit are incandescent lamps, and the voltage dividing unit is a halogen tungsten lamp.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the embodiment of the utility model provides a frequency conversion module on-line test instrument can judge whether soft trouble occurs on the drive and power tube of the same way that the indicating unit corresponds through the instruction of any prompting unit; and when testing whether frequency conversion module is out of order, need not to cut off the power of frequency conversion mainboard, consequently can judge whether this way driven frequency change is normal through the frequency and the pulse width duty cycle of regulation signal generator, whether the instruction intensity of any suggestion unit changes simultaneously.

Six-path driving and power tubes inside the on-line testing frequency conversion module are visually displayed through a small bulb simulation load, and the problem that the six-path driving and power tubes inside the frequency conversion module are difficult to judge whether the frequency conversion module is good or bad due to soft faults is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of an online testing instrument for a frequency conversion module according to an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a test module according to an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of an indication module according to an embodiment of the present invention.

Wherein: 0-instrument body, 1-red meter pen, 2-black meter pen, 3-test module, 31-signal generator, 32-power module, 33-voltage reduction module, 4-indication module, 41-prompt unit, 42-voltage division unit and 43-input change-over switch.

Detailed Description

To make the objects, aspects and advantages of the present invention clearer, and in accordance with the following detailed description of certain embodiments of the present invention, it is to be understood that the terms "center," "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship shown in the accompanying drawings, which are used for convenience of description and simplicity of illustration, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Fig. 1 is a connection circuit diagram of the frequency conversion module online test instrument provided by the embodiment of the present invention, wherein, the frequency conversion module is provided with an input end and an output end, and the input end of the frequency conversion module includes: three way half-bridge drive signal input terminal, three way half-bridge drive signal input terminal and ground terminal GND under.

Wherein, half-bridge drive signal input terminal is on above-mentioned three way: UP input terminal, VP input terminal, WP input terminal, half-bridge drive signal input terminal is under three routes: a UN input terminal, a VN input terminal, and a WN input terminal.

Frequency conversion module on-line measuring instrument includes: frequency conversion module on-line measuring instrument includes: instrument body 0, red table pen 1 and black table pen 2 set up in the outside of instrument body 0, are provided with test module 3 and indication module 4 in the instrument body 0.

As shown in fig. 1, the test module 3 includes a signal generator 31, the signal generator 31 is provided with a first output end and a second output end, the first output end is connected with the black pen 2, and the black pen 2 is connected with the ground terminal GND; the second output end is connected with a red meter pen 1, and the red meter pen 1 is connected with the three-way upper half-bridge driving signal input terminal and/or the three-way lower half-bridge driving signal input terminal. The signal generator 31 is a frequency-pulse width adjustable signal generator 31.

The indicating module 4, the indicating module 4 includes at least three prompting units 41, each prompting unit 41 corresponds to one of the driving signals, and each prompting unit 41 is used for being conducted with the output end of the frequency conversion module and the power supply of the frequency conversion mainboard.

The embodiment of the utility model provides a frequency conversion module on-line measuring instrument is applicable to the scene that needs carry out the test to frequency conversion module. When the frequency conversion module is required to be tested to determine whether the frequency conversion module has a fault, the power supply of the frequency conversion mainboard is not required to be cut off, the red stylus 1 of the testing instrument is only required to be connected with the three-way upper half-bridge driving signal input terminal and/or the three-way lower half-bridge driving signal input terminal of the frequency conversion module, the black stylus 2 is only required to be connected with the ground terminal GND of the frequency conversion module, and whether the frequency conversion module has a fault can be determined through the prompting unit 41. The embodiment of the utility model provides a do not do specifically and restrict the suggestion mode of suggestion unit 41, it can be voice prompt, also can be light prompt, for example: incandescent lamps, or LED lamps.

Wherein, for convenience red pen-shape metre 1, black pen-shape metre 2 are connected according to above-mentioned mode with the frequency conversion module, can be provided with three socket on the frequency conversion board, and half-bridge drive signal input terminal is connected on a socket and the three routes, and half-bridge drive signal input terminal is connected under a socket and the three routes, and a socket is connected with ground terminal GND, and then, can realize above-mentioned connection through inserting red pen-shape metre 1 and black pen-shape metre 2 in the different jacks.

The embodiment of the utility model provides a frequency conversion module on-line test instrument can judge whether soft trouble takes place on the drive of the same way that this indicating unit corresponds and the power tube through the instruction of arbitrary prompting unit 41; moreover, when testing whether the frequency conversion module is in fault, the power supply of the frequency conversion mainboard does not need to be cut off, so that whether the frequency change of the drive of the circuit is normal or not can be judged by adjusting the frequency and the pulse width duty ratio of the signal generator 31 and judging whether the indication intensity (such as the brightness degree of a lamp bulb or the sound level) of any prompt unit is changed or not.

Next, description will be made with respect to the test module 3.

Regarding the form of electrical connection between the signal generator 31 and the black list pen 2 in the test module 3, in a possible implementation, as shown in fig. 2, the test module 3 further includes: a first resistor R1, a second resistor R2 and a drive transistor Q1.

The first output end of the test module 3 is connected with the input end of a first resistor R1, the first output end of a first resistor R1 is connected with the base electrode of a transistor Q1, the collector electrode of the transistor Q1 is connected with the black pen 2 interface module, the emitter electrode of the transistor Q1 is connected with the second output end of a first resistor R1 through a second resistor R2, and the emitter electrode of the transistor Q1 is grounded.

Regarding the electrical connection form of the signal generator 31 in the test module 3 and the red stylus 1, in a possible implementation, the test module 3 further includes: and a third resistor, wherein a second output end of the test module 3 is connected with the interface module of the red meter pen 1 through the third resistor.

Of course, the test module 3 also comprises: the power module 32 is connected with the voltage-reducing module 33, and the voltage-reducing module 33 is respectively connected with the second output end of the signal generator 31 and the third resistor. Wherein, this step-down module 33 can be according to the requirement of frequency conversion module driving voltage, thereby the adjustment of output pulse voltage amplitude is realized in the power supply of adjustment signal generator 31, and in a possible implementation, the voltage range after step-down by step-down module 33 is 3V-8V, for example: the voltage of the power module 32 is 9V, and the voltage dropping module 33 may drop the voltage of 9V to 3.3V, or may also drop the voltage of 9V to 3.5V.

In the following, description will be made with respect to the indication module 4.

In a possible implementation manner, as shown in fig. 1 and fig. 3, the indication module 4 includes three prompting units 41, a first prompting unit, a second prompting unit, and a third prompting unit are connected in parallel, each prompting unit 41 corresponds to one of the driving signals, and the first prompting unit, the second prompting unit, and the third prompting unit are used for being connected to the output end of the frequency conversion module and the power supply of the frequency conversion main board. The first prompting unit, the second prompting unit and the third prompting unit are all incandescent lamps.

And when the black pen 2 is connected with the ground terminal GND and the red pen 1 is connected with the three-way upper half-bridge driving signal input terminal and/or the three-way lower half-bridge driving signal input terminal, the first prompt unit, the second prompt unit and the third prompt unit are conducted with the frequency conversion module and the power supply of the frequency conversion mainboard.

In addition, the indicating module 4 further includes a voltage dividing unit 42, one end of the voltage dividing unit 42 is connected in series with the first prompting unit, the second prompting unit and the third prompting unit, the other end of the voltage dividing unit 42 is connected with a power supply of the frequency conversion main board, and the voltage dividing unit 42 may be a halogen tungsten lamp.

Then, in order to facilitate connection between the red stylus 1 and three half-bridge driving signal input terminals on the frequency conversion module, the indication module 4 can test whether the upper half-bridge driving fails; and when the red pen-shape metre 1 is connected with the three-way lower half-bridge drive signal input terminal on the frequency conversion module, the indication module 4 can test whether the lower half-bridge drive is in fault.

In a possible implementation manner, the indication module 4 further includes an input switch 43, the input switch 43 is respectively connected to the voltage dividing unit 42 and the power supply of the variable frequency main board, and the input switch 43 is capable of switching between a first gear and a second gear.

The change-over switch is used for connecting the voltage dividing unit 42 with the negative electrode of the power supply on the frequency conversion mainboard through the input change-over switch 43 when the change-over switch is in the first gear; the switch is also used for connecting the voltage dividing unit 42 with the positive electrode of the power supply on the frequency conversion main board through the input switch 43 when the switch is in the second gear.

When the power supply is used, a worker can switch the selector switch to a proper gear, then the red meter pen 1 is connected with the corresponding three-way driving signal input terminal, and the black meter pen 2 is connected with the ground terminal GND, so that the first prompting unit, the second prompting unit and the third prompting unit are all communicated with the power supplies of the frequency conversion module and the frequency conversion mainboard, and one-way driving or power tube corresponding to the prompting unit 41 can be determined to be damaged through the prompting of the prompting unit 41.

For example: as shown in fig. 3, the first gear is a P gear, the second gear is an N gear, the first prompting unit is an incandescent lamp L1, the second prompting unit is an incandescent lamp L2, the third prompting unit is an incandescent lamp L3, L1 corresponds to a U-way, L2 corresponds to a V-way, L3 corresponds to a W-way, and the voltage dividing unit 42 is a halogen tungsten lamp L4.

When the worker dials the input switch 43 to the N position, that is, in the N position, the bulb L4 is conducted to the negative electrode N of the frequency conversion motherboard powered by the 300V dc through the input switch 43, and then the black stylus 2 is grounded, the red stylus 1 respectively tests the UP, VP, and WP upper half-bridge drives of the frequency conversion module, and at this time, the corresponding bulbs U, V, W, such as bulb L1, bulb L2, and bulb L3, should be turned on.

When the worker dials the input switch 43 to the position P, the bulb L4 is connected to the positive pole P of the 300V dc power supply of the frequency conversion main board through the input switch 43, and then the black stylus 2 is grounded, the red stylus 1 respectively tests the half-bridge driving of the UN, VN and WN of the frequency conversion module, and at this time, the corresponding bulbs L1, L2 and L3 of U, V, W should be turned on.

Therefore, when the six-way drive of the frequency conversion module is tested on line, the drive or the power tube can be determined to be damaged by observing which street lamp is not lighted.

In addition, whether the frequency change of the driving of any path is normal or not can be judged by adjusting the frequency and the pulse width duty ratio of the signal generator 31 and observing the brightness change of any path of load small bulbs.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. The utility model provides a frequency conversion module on-line measuring instrument which characterized in that, be provided with input and output on the frequency conversion module, the input of frequency conversion module includes: three-way half-bridge drive signal input terminal, three-way lower half-bridge drive signal input terminal and grounding terminal; the frequency conversion module online test instrument comprises: the instrument comprises an instrument body (0), a red meter pen (1) and a black meter pen (2), wherein the red meter pen (1) and the black meter pen (2) are arranged on the outer side of the instrument body (0), and a test module (3) and an indication module (4) are arranged in the instrument body (0);

the testing module (3) comprises a signal generator (31), a first output end and a second output end are arranged on the signal generator (31), the first output end is connected with the black pen (2), and the black pen (2) is connected with the grounding terminal; the second output end is connected with the red meter pen (1), and the red meter pen (1) is connected with the three-way half-bridge drive signal input terminal and/or the three-way lower half-bridge drive signal input terminal;

the indicating module (4), indicating module (4) includes at least three suggestion unit (41), every suggestion unit (41) correspond with drive signal all the way, and every suggestion unit (41) all be used for with the output of frequency conversion module and the power of frequency conversion mainboard switch on.

2. The on-line testing instrument of claim 1, wherein the three-way half-bridge driving signal input terminal is: UP input terminal, VP input terminal, WP input terminal, half-bridge drive signal input terminal under three routes is: a UN input terminal, a VN input terminal, and a WN input terminal.

3. A variable frequency module in-line test instrument according to claim 1, wherein the test module (3) further comprises: the resistor I, the resistor II and the excitation triode;

the first output end of the test module (3) is connected with the input end of the first resistor, the first output end of the first resistor is connected with the base electrode of the excitation triode, the collector electrode of the excitation triode is connected with the black pen (2) interface module, the emitter electrode of the excitation triode is connected with the second output end of the first resistor through a second resistor, and the emitter electrode of the excitation triode is grounded.

4. A variable frequency module in-line test instrument according to claim 3, wherein the test module (3) further comprises: and the second output end of the test module (3) is connected with the interface module of the red meter pen (1) through the third resistor.

5. A variable frequency module in-line test instrument according to claim 4, wherein the test module (3) further comprises: power module (32) and step-down module (33), power module (32) with step-down module (33) are connected, step-down module (33) respectively with the second output of signal generator (31) with resistance three is connected.

6. The on-line testing instrument for the frequency conversion module according to claim 1, wherein the indication module (4) comprises three prompting units (41), a first prompting unit, a second prompting unit and a third prompting unit are connected in parallel, and the first prompting unit, the second prompting unit and the third prompting unit are used for being conducted with the output end of the frequency conversion module and the power supply of the frequency conversion mainboard.

7. The on-line testing instrument for the frequency conversion module according to claim 6, wherein the indicating module (4) further comprises a voltage dividing unit (42), one end of the voltage dividing unit (42) is connected in series with the first prompting unit, the second prompting unit and the third prompting unit, and the other end is connected with a power supply of the frequency conversion mainboard.

8. The on-line testing instrument for the variable-frequency module according to claim 7, wherein the indicating module (4) further comprises an input switch (43), the input switch (43) is respectively connected with the voltage dividing unit (42) and the power supply of the variable-frequency main board, and the input switch (43) can be switched between a first gear and a second gear;

the change-over switch is used for enabling the voltage division unit (42) to be connected with the negative pole of a power supply on the variable-frequency mainboard through the input change-over switch (43) when the change-over switch is in the first gear; the change-over switch is also used for enabling the voltage division unit (42) to be connected with the positive electrode of the power supply on the frequency conversion main board through the input change-over switch (43) when the change-over switch is in the second gear.

9. The on-line testing instrument for the variable-frequency module as claimed in claim 7, wherein the first prompting unit, the second prompting unit and the third prompting unit are all incandescent lamps, and the voltage dividing unit (42) is a halogen tungsten lamp.