Test circuit

Abstract

This application provides a test circuit comprising: a motor circuit and a data acquisition card. The motor circuit includes a three-phase power supply circuit; a first output terminal of the three-phase power supply circuit is connected to a first sampling terminal of the data acquisition card; a second output terminal of the three-phase power supply circuit is connected to a second sampling terminal of the data acquisition card; and a third output terminal of the three-phase power supply circuit is connected to a third sampling terminal of the data acquisition card. If the signal received at the first sampling terminal of the data acquisition card is a periodic signal, the first path in the motor circuit is determined to be normal; if the signal received at the second sampling terminal of the data acquisition card is a periodic signal, the second path in the motor circuit is determined to be normal; and if the signal received at the third sampling terminal of the data acquisition card is a periodic signal, the third path in the motor circuit is determined to be normal.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a test circuit. Background Technology

[0002] The motor circuit includes a three-phase power supply circuit to power the motor. To ensure the availability of the three-phase power supply circuit, a continuity test is required after the motor circuit is manufactured. Currently, the common method for continuity testing of motor circuits requires connecting the motor circuit to the motor and judging the continuity of the motor circuit by whether the motor functions normally. Due to the large weight and size of the motor, the operation of connecting the motor circuit to the motor is complex, which in turn leads to a high level of complexity in testing the continuity of the motor circuit.

[0003] Therefore, there is an urgent need for a feasible test circuit to reduce the complexity of testing the connectivity of motor circuits. Utility Model Content

[0004] This application provides a test circuit for testing the connectivity of a motor circuit, reducing the complexity of testing the connectivity of the motor circuit and improving the efficiency of testing the connectivity of the motor circuit.

[0005] A first aspect of this application provides a test circuit, characterized in that the test circuit is used to test the connectivity of a motor circuit, the test circuit comprising:

[0006] The motor circuit and the data acquisition card, wherein the motor circuit includes a three-phase power supply circuit;

[0007] The first output terminal of the three-phase power supply circuit is connected to the first sampling terminal of the data acquisition card, the second output terminal of the three-phase power supply circuit is connected to the second sampling terminal of the data acquisition card, and the third output terminal of the three-phase power supply circuit is connected to the third sampling terminal of the data acquisition card.

[0008] If the signal received at the first sampling end of the data acquisition card is a periodic signal, it is determined that the first path in the motor circuit is normal, and the first path passes through the first output end of the three-phase power supply circuit.

[0009] If the signal received at the second sampling terminal of the data acquisition card is a periodic signal, it is determined that the second path in the motor circuit is normal, and the second path passes through the second output terminal of the three-phase power supply circuit;

[0010] If the signal received at the third sampling terminal of the data acquisition card is a periodic signal, it is determined that the third path in the motor circuit is normal, and the third path passes through the third output terminal of the three-phase power supply circuit.

[0011] Optionally, the three-phase power supply circuit includes a DC power supply, a first bridge arm, a second bridge arm, and a third bridge arm, and the test circuit includes a current limiting circuit;

[0012] The first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected to the positive terminal of the DC power supply. The second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm are connected to the negative terminal of the DC power supply. The midpoint of the first bridge arm is connected to the first terminal of the current limiting circuit and the first sampling terminal of the data acquisition card. The midpoint of the second bridge arm is connected to the second terminal of the current limiting circuit and the second sampling terminal of the data acquisition card. The midpoint of the third bridge arm is connected to the third terminal of the current limiting circuit and the third sampling terminal of the data acquisition card.

[0013] Optionally, the first bridge arm includes a first switch and a second switch, the second bridge arm includes a third switch and a fourth switch, and the third bridge arm includes a fifth switch and a sixth switch; the first end of the first switch is connected to the first end of the third switch and the first end of the fifth switch and the positive terminal of the DC power supply, the second end of the first switch is connected to the first end of the second switch, the first end of the current limiting circuit and the first sampling end of the data acquisition card, the second end of the third switch is connected to the first end of the fourth switch, the second end of the current limiting circuit and the second sampling end of the data acquisition card, and the second end of the fifth switch is connected to the first end of the sixth switch, the third end of the current limiting circuit and the third sampling end of the data acquisition card.

[0014] Optionally, the first circuit is activated when both the first switch and the fourth switch are closed, or when both the first switch and the sixth switch are closed.

[0015] When both the third switch and the second switch are closed, or when both the third switch and the sixth switch are closed, the second path is activated;

[0016] The third path is activated when both the fifth switch and the second switch are closed, or when both the fifth switch and the fourth switch are closed.

[0017] Optionally, the signals received by the first sampling terminal, the second sampling terminal, and the third sampling terminal of the data acquisition card are all square wave signals, and the test circuit further includes:

[0018] Filtering circuit;

[0019] The first terminal of the filter circuit is connected to the second terminal of the first switch, the first terminal of the second switch, and the first terminal of the current limiting circuit. The second terminal of the filter circuit is connected to the second terminal of the third switch, the first terminal of the fourth switch, and the second terminal of the current limiting circuit. The third terminal of the filter circuit is connected to the second terminal of the fifth switch, the first terminal of the sixth switch, and the third terminal of the current limiting circuit. The fourth terminal of the filter circuit is connected to the fourth sampling terminal of the data acquisition card. The fifth terminal of the filter circuit is connected to the fifth sampling terminal of the data acquisition card. The sixth terminal of the filter circuit is connected to the sixth sampling terminal of the data acquisition card.

[0020] Optionally, the motor circuit further includes:

[0021] Hall effect sensor;

[0022] The output terminal of the Hall sensor is connected to the detection terminal of the data acquisition card.

[0023] Optionally, the Hall sensor receives a first instruction and outputs a first signal to the data acquisition card according to the first instruction, wherein the first instruction is used to instruct the Hall sensor to output a high-level signal;

[0024] When the Hall sensor receives the first instruction and the first signal received by the data acquisition card is a high-level signal, it is determined that the fourth path in the motor circuit is normal, and the fourth path passes through the Hall sensor.

[0025] Optionally, the Hall sensor receives a second instruction and outputs a second signal to the data acquisition card according to the first instruction, wherein the first instruction is used to instruct the Hall sensor to output a low-level signal;

[0026] When the Hall sensor receives the second instruction and the second signal received by the data acquisition card is a low-level signal, it is determined that the fourth path in the motor circuit is normal, and the fourth path passes through the Hall sensor.

[0027] Optionally, the current limiting circuit includes:

[0028] First resistor, second resistor, and third resistor;

[0029] The first end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor. The second end of the first resistor is connected to the second end of the first switch, the first end of the second switch and the first sampling end of the data acquisition card. The second end of the second resistor is connected to the second end of the third switch, the first end of the fourth switch and the second sampling end of the data acquisition card. The second end of the third resistor is connected to the second end of the fifth switch, the first end of the sixth switch and the third sampling end of the data acquisition card.

[0030] Optionally, the current limiting circuit further includes:

[0031] The fourth resistor, the fifth resistor, and the sixth resistor;

[0032] The second end of the first switch is connected to the first end of the second switch, the first sampling end of the data acquisition card, the first end of the fourth resistor, and the first end of the fifth resistor. The second end of the third switch is connected to the first end of the fourth switch, the second sampling end of the data acquisition card, the second end of the fourth resistor, and the first end of the sixth resistor. The second end of the fifth switch is connected to the first end of the sixth switch, the third sampling end of the data acquisition card, the second end of the fifth resistor, and the second end of the sixth resistor.

[0033] In this embodiment, the test circuit utilizes a data acquisition card to collect signals from the first, second, and third output terminals of the three-phase power supply circuit. This data is used to determine the normality of the first path through the first output terminal, the first path through the second output terminal, and the third path through the third output terminal. If the signal received at the first sampling terminal of the data acquisition card is a periodic signal, the first path is normal. If the signal received at the second sampling terminal of the data acquisition card is a periodic signal, the second path is normal. If the signal received at the third sampling terminal of the data acquisition card is a periodic signal, the third path is normal. Through these steps, the continuity of the motor circuit is determined using the data acquisition card in the test circuit. Compared to connecting the motor circuit to the motor, determining the continuity of the motor circuit by checking the normality of the motor's function avoids connecting the motor circuit to the motor, reducing the operational complexity of the test and improving the efficiency of testing the continuity of the motor circuit. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a conventional test circuit provided in an embodiment of this application;

[0036] Figure 2 A schematic diagram of a test circuit provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of another test circuit provided in an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of another test circuit provided in an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of another test circuit provided in an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of another test circuit provided in an embodiment of this application;

[0041] Figure 7 This is a schematic diagram of another test circuit provided in an embodiment of this application;

[0042] Figure 8 This is a schematic diagram of another test circuit provided in an embodiment of this application. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] Please see Figure 1 , Figure 1 This is a schematic diagram of a conventional test circuit provided in an embodiment of this application. The test circuit includes a motor circuit and a motor, and the motor circuit includes a three-phase power supply circuit. The first output terminal of the three-phase power supply circuit is connected to the first input terminal of the motor, the second output terminal of the three-phase power supply circuit is connected to the second input terminal of the motor, and the third output terminal of the three-phase power supply circuit is connected to the third input terminal of the motor. The three-phase power supply circuit 110 is used to supply power to the motor so that the motor can work normally, thereby determining the connectivity of the three-phase power supply circuit in the motor circuit. However, due to the high complexity of connecting the motor circuit to the motor, the complexity of testing the connectivity of the motor circuit using this test circuit is high, and the efficiency of testing the connectivity of the motor circuit is low.

[0047] Please see Figure 2 , Figure 2 This is a schematic diagram of a test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100 and a data acquisition card 200. The motor circuit 100 includes a three-phase power supply circuit 110. The data acquisition card 200 includes a first sampling terminal 201, a second sampling terminal 202, and a third sampling terminal 203. The three-phase power supply circuit 110 includes a first output terminal 111, a second output terminal 112, and a third output terminal 113. The first sampling terminal 201 of the data acquisition card 200 is connected to the first output terminal 111 of the three-phase power supply circuit 110, the second sampling terminal 202 of the data acquisition card 200 is connected to the second output terminal 112 of the three-phase power supply circuit 110, and the third sampling terminal 203 of the data acquisition card 200 is connected to the third output terminal 113 of the three-phase power supply circuit 110.

[0048] The first sampling terminal 201 of the data acquisition card 200 is used to sample the signal output by the first output terminal 111 of the three-phase power supply circuit 110. When the signal received by the first sampling terminal 201 of the data acquisition card 200 is a periodic signal, it indicates that the three-phase power supply circuit 110 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the first output terminal 111. The first path through the first output terminal 111 of the three-phase power supply circuit 110 is normal, and the periodic signal output through the first output terminal 111 of the three-phase power supply circuit 110 can be acquired by the first sampling terminal 201 of the data acquisition card 200.

[0049] The second sampling terminal 202 of the data acquisition card 200 is used to sample the signal output by the second output terminal 112 of the three-phase power supply circuit 110. When the signal received by the second sampling terminal 202 of the data acquisition card 200 is a periodic signal, it indicates that the three-phase power supply circuit 110 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the second output terminal 112. The second path through the second output terminal 112 of the three-phase power supply circuit 110 is normal, and the periodic signal output through the second output terminal 112 of the three-phase power supply circuit 110 can be acquired by the second sampling terminal 202 of the data acquisition card 200.

[0050] The third sampling terminal 203 of the data acquisition card 200 is used to sample the signal output by the third output terminal 113 of the three-phase power supply circuit 110. When the signal received by the third sampling terminal 203 of the data acquisition card 200 is a periodic signal, it means that the three-phase power supply circuit 110 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the third output terminal 113. The third path through the third output terminal 113 of the three-phase power supply circuit 110 is normal, and the periodic signal output through the third output terminal 113 of the three-phase power supply circuit 110 can be acquired by the third sampling terminal 203 of the data acquisition card 200.

[0051] In this embodiment, the test circuit utilizes a data acquisition card 200 to collect signals output from the first output terminal 111, the second output terminal 112, and the third output terminal 113 of the three-phase power supply circuit 110. This data is used to determine the normality of the first path through the first output terminal 111, the first path through the second output terminal 112, and the third path through the third output terminal 113 of the three-phase power supply circuit 110. If the signal received by the first sampling terminal 201 of the data acquisition card 200 is a periodic signal, the first path is normal. If the signal received by the second sampling terminal 202 of the data acquisition card 200 is a periodic signal, the second path is normal. If the signal received by the third sampling terminal 203 of the data acquisition card 200 is a periodic signal, the third path is normal. By using the above steps, the connectivity of the motor circuit 100 is determined by the data acquisition card 200 in the test circuit. Compared with connecting the motor circuit 100 to the motor, the connectivity of the motor circuit 100 can be determined by whether the motor is functioning properly. This avoids connecting the motor circuit 100 to the motor, reduces the complexity of the test operation, and improves the efficiency of testing the connectivity of the motor circuit 100.

[0052] Please see Figure 3 , Figure 3This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, and a current limiting circuit 300. The motor circuit 100 includes a three-phase power supply circuit 110, which includes a first bridge arm 114, a second bridge arm 115, a third bridge arm 116, and a DC power supply 117. The first bridge arm 114 includes a first switch S1 and a second switch S2. The second bridge arm 115 includes a third switch S3 and a fourth switch S4. The third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The data acquisition card 200 includes a first sampling terminal 201, a second sampling terminal 202, and a third sampling terminal 203. The current limiting circuit 300 includes a first terminal 301, a second terminal 302, and a third terminal 303. The first terminal of the first switch S1 is connected to the first terminal of the third switch S3, the first terminal of the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminal of the fourth switch S4, the second terminal of the sixth switch S6, and the negative terminal of the DC power supply 117. The second terminal of the first switch S1 is connected to the first terminal of the second switch S2, the first terminal 301 of the current limiting circuit 300, and the first sampling terminal 201 of the data acquisition card 200. The second terminal of the third switch S3 is connected to the first terminal of the fourth switch S4, the second terminal 302 of the current limiting circuit 300, and the second sampling terminal 202 of the data acquisition card 200. The second terminal of the fifth switch S5 is connected to the first terminal of the sixth switch S6, the third terminal 303 of the current limiting circuit 300, and the third sampling terminal 203 of the data acquisition card 200.

[0053] The current limiting circuit 300 is used to limit the magnitude of the output current of the three-phase power supply circuit 110 to ensure that the output current of the three-phase power supply circuit 110 is within a certain range, thereby avoiding damage to the components in the three-phase power supply circuit 110 due to excessive current.

[0054] Optionally, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, and the sixth switch S6 are all switches capable of carrying high power current.

[0055] Alternatively, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, and the sixth switch S6 are all MOSFETs.

[0056] When the first switch S1 and the fourth switch S4 are closed, or when the first switch S1 and the sixth switch S6 are closed, the first path is open. The first path passes through the first switch S1, the current limiting circuit 300, and the fourth switch S4, or the first path passes through the first switch S1, the current limiting circuit 300, and the sixth switch S6. When the first path is open, the first sampling terminal 201 of the data acquisition card 200 can sample the signal on the first path. If the signal sampled by the first sampling terminal 201 of the data acquisition card 200 is a periodic signal, it indicates that the DC power supply 117 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the first switch S1, and the first path passing through the first switch S1 is normal.

[0057] When the third switch S3 and the second switch S2 are closed, or when the third switch S3 and the sixth switch S6 are closed, the second path is open. The second path passes through the third switch S3, the current limiting circuit 300, and the second switch S2, or the second path passes through the third switch S3, the current limiting circuit 300, and the sixth switch S6. When the second path is open, the second sampling terminal 202 of the data acquisition card 200 can sample the signal on the second path. If the signal sampled by the second sampling terminal 202 of the data acquisition card 200 is a periodic signal, it indicates that the DC power supply 117 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the third switch S3, and the second path passing through the third switch S3 is normal.

[0058] When the fifth switch S5 and the second switch S2 are closed, or when the fifth switch S5 and the fourth switch S4 are closed, the third path is open. The third path passes through the fifth switch S5, the current limiting circuit 300, and the second switch S2, or the third path passes through the fifth switch S5, the current limiting circuit 300, and the fourth switch S4. When the third path is open, the third sampling terminal 203 of the data acquisition card 200 can sample the signal on the third path. If the signal sampled by the third sampling terminal 203 of the data acquisition card 200 is a periodic signal, it indicates that the DC power supply 117 can output a periodic signal whose instantaneous amplitude changes repeatedly with time through the fifth switch S5, and the third path passing through the fifth switch S5 is normal.

[0059] Please see Figure 4 , Figure 4This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, and a current limiting circuit 300. The motor circuit 100 includes a three-phase power supply circuit 110, which includes a first bridge arm 114, a second bridge arm 115, a third bridge arm 116, and a DC power supply 117. The first bridge arm 114 includes a first switch S1 and a second switch S2. The second bridge arm 115 includes a third switch S3 and a fourth switch S4. The third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The current limiting circuit 300 includes a first resistor R1, a second resistor R2, and a third resistor R3. The data acquisition card 200 includes a first sampling terminal 201, a second sampling terminal 202, and a third sampling terminal 203. The first terminal of the first switch S1 is connected to the first terminal of the third switch S3, the first terminal of the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminal of the fourth switch S4, the second terminal of the sixth switch S6, and the negative terminal of the DC power supply 117. The first terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the first terminal of the third resistor R3. The second terminal of the first resistor R1 is connected to the second terminal of the first switch S1, the first terminal of the second switch S2, and the first sampling terminal 201 of the data acquisition card 200. The second terminal of the second resistor R2 is connected to the second terminal of the third switch S3, the first terminal of the fourth switch S4, and the second sampling terminal 202 of the data acquisition card 200. The second terminal of the third resistor R3 is connected to the second terminal of the fifth switch S5, the first terminal of the sixth switch S6, and the third sampling terminal 203 of the data acquisition card 200.

[0060] As shown in the figure, the first resistor R1, the second resistor R2, and the third resistor R3 form a star resistor, which is used to limit the magnitude of the output current of the three-phase power supply circuit 110. When any one of the first, second, or third paths is conducting, the conducting path passes through two of the resistors R1, R2, and R3 connected in series, resulting in a smaller current in the test circuit. This improves the service life of the test circuit and prevents the components in the test circuit from failing due to excessive current.

[0061] Please see Figure 5 , Figure 5This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, and a current limiting circuit 300. The motor circuit 100 includes a three-phase power supply circuit 110, which includes a first bridge arm 114, a second bridge arm 115, a third bridge arm 116, and a DC power supply 117. The first bridge arm 114 includes a first switch S1 and a second switch S2; the second bridge arm 115 includes a third switch S3 and a fourth switch S4; and the third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The current limiting circuit 300 includes resistors R4, R5, and R6. The data acquisition card 200 includes a first sampling terminal 201, a second sampling terminal 202, and a third sampling terminal 203. The first terminal of the first switch S1 is connected to the first terminal of the third switch S3, the first terminal of the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminal of the fourth switch S4, the second terminal of the sixth switch S6, and the negative terminal of the DC power supply 117. The second terminal of the first switch S1 is connected to the first terminal of the second switch S2, the first sampling terminal 201 of the data acquisition card 200, the first terminal of the fourth resistor R4, and the first terminal of the fifth resistor R5. The second terminal of the third switch S3 is connected to the first terminal of the fourth switch S4, the second sampling terminal 202 of the data acquisition card 200, the second terminal of the fourth resistor R4, and the first terminal of the sixth resistor R6. The second terminal of the fifth switch S5 is connected to the first terminal of the sixth switch S6, the third sampling terminal 203 of the data acquisition card 200, the second terminal of the fifth resistor R5, and the second terminal of the sixth resistor R6.

[0062] As shown in the figure, the fourth, fifth, and sixth resistors form a triangular resistor, which is used to limit the magnitude of the current output by the three-phase power supply circuit 110. Even if any one of the resistors in the triangular resistor fails, the magnitude of the current output by the three-phase power supply circuit 110 can still be limited by the other two resistors, thus preventing the failure of the current limiting circuit 300 due to the failure of one resistor in the current limiting circuit 300.

[0063] Please see Figure 6 , Figure 6This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, a current limiting circuit 300, and a filter circuit 400. The motor circuit 100 includes a three-phase power supply circuit 110, which includes a first bridge arm 114, a second bridge arm 115, a third bridge arm 116, and a DC power supply 117. The first bridge arm 114 includes a first switch S1 and a second switch S2. The second bridge arm 115 includes a third switch S3 and a fourth switch S4. The third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The data acquisition card 200 includes a fourth sampling terminal 204, a fifth sampling terminal 205, and a sixth sampling terminal 206. The current limiting circuit 300 includes a first terminal 301, a second terminal 302, and a third terminal 303. The filter circuit 400 includes a first terminal 401, a second terminal 402, a third terminal 403, a fourth terminal 404, a fifth terminal 405, and a sixth terminal 406. The first terminal of the first switch S1 is connected to the first terminals of the third switch S3 and the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminals of the fourth switch S4 and the sixth switch S6, and the negative terminal of the DC power supply 117. The second terminal of the first switch S1 is connected to the first terminal of the second switch S2, the first terminal 301 of the current limiting circuit 300, and the first terminal 401 of the filter circuit 400. The second terminal of the third switch S3 is connected to the first terminal of the fourth switch S4 and the second terminal of the current limiting circuit 300. The second terminal 402 of the current limiting circuit 300 is connected to the second terminal 402 of the filter circuit 400. The second terminal of the fifth switch S5 is connected to the first terminal of the sixth switch S6, the third terminal 303 of the current limiting circuit 300, and the third terminal 403 of the filter circuit 400. The fourth terminal 404 of the filter circuit 400 is connected to the fourth sampling terminal 204 of the data acquisition card 200. The fifth terminal 405 of the filter circuit 400 is connected to the fifth sampling terminal 205 of the data acquisition card 200. The sixth terminal 406 of the filter circuit 400 is connected to the sixth sampling terminal 206 of the data acquisition card 200.

[0064] When the signals received by the first sampling terminal 201, the second sampling terminal 202, and the third sampling terminal 203 of the data acquisition card 200 are all square wave signals, the square wave signals can be filtered by the filter circuit 400 to obtain a sine wave signal, and then the sine wave signal can be transmitted to the data acquisition card 200.

[0065] Optionally, the filter circuit 400 is an RC low-pass filter.

[0066] In one possible implementation, the data acquisition card 200 determines the AC effective value (Root Mean Square, RMS) of the acquired sine wave signal. If the AC effective value of the received sine wave signal is greater than 0, it determines that the circuit in the three-phase power supply circuit 110 is normal.

[0067] In another possible implementation method, the data acquisition card 200 determines the total harmonic distortion (THD) of the acquired sine wave signal. If the AC effective value of the received sine wave signal is less than 100 (the sine wave signal is not completely distorted), it determines that the path in the three-phase power supply circuit 110 is normal.

[0068] Please see Figure 7 , Figure 7 This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, a current limiting circuit 300, and a filter circuit 400. The motor circuit 100 includes a three-phase power supply circuit 110 and a Hall sensor 120. The three-phase power supply circuit 110 includes a first bridge arm 114, a second bridge arm 115, a third bridge arm 116, and a DC power supply 117. The first bridge arm 114 includes a first switch S1 and a second switch S2. The second bridge arm 115 includes a third switch S3 and a fourth switch S4. The third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The data acquisition card 200 includes a fourth sampling terminal 204, a fifth sampling terminal 205, a sixth sampling terminal 206, and a detection terminal 207. The current limiting circuit 300 includes a first terminal 301, a second terminal 302, and a third terminal 303. The filter circuit 400 includes a first terminal 401, a second terminal 402, a third terminal 403, a fourth terminal 404, a fifth terminal 405, and a sixth terminal 406. The Hall sensor 120 includes an output terminal 121. The first terminal of the first switch S1 is connected to the first terminals of the third switch S3 and the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminals of the fourth switch S4 and the sixth switch S6, and the negative terminal of the DC power supply 117. The second terminal of the first switch S1 is connected to the first terminal of the second switch S2, the first terminal 301 of the current limiting circuit 300, and the first terminal 401 of the filter circuit 400. The second terminal of the third switch S3 is connected to the first terminal of the fourth switch S4, the second terminal 302 of the current limiting circuit 300, and the second terminal 401 of the filter circuit 400. 2. The second terminal of the fifth switch S5 is connected to the first terminal of the sixth switch S6, the third terminal 303 of the current limiting circuit 300, and the third terminal 403 of the filter circuit 400. The fourth terminal 404 of the filter circuit 400 is connected to the fourth sampling terminal 204 of the data acquisition card 200. The fifth terminal 405 of the filter circuit 400 is connected to the fifth sampling terminal 205 of the data acquisition card 200. The sixth terminal 406 of the filter circuit 400 is connected to the sixth sampling terminal 206 of the data acquisition card 200. The output terminal 121 of the Hall sensor 120 is connected to the detection terminal 207 of the data acquisition card 200.

[0069] The Hall sensor 120 is used to connect to the motor to acquire parameters such as current, position, and speed when the motor is working, and outputs the acquired parameters.

[0070] When Hall sensor 120 receives a first instruction instructing Hall sensor 120 to output a high-level signal, and the detection terminal 207 of data acquisition card 200 receives a high-level signal from the first signal output by Hall sensor 120, it is determined that the fourth path in motor circuit 100 is normal, and the fourth path passes through Hall sensor 120.

[0071] Optionally, if the voltage of the first signal output by the Hall sensor 120 is greater than 3.5 volts, the first signal is determined to be a high-level signal.

[0072] When Hall sensor 120 receives a second instruction instructing Hall sensor 120 to output a low-level signal, and the detection terminal 207 of data acquisition card 200 receives a low-level signal from the second signal output by Hall sensor 120, it is determined that the fourth path in motor circuit 100 is normal, and the fourth path passes through Hall sensor 120.

[0073] Optionally, if the voltage of the second signal output by the Hall sensor 120 is less than 0.8 volts, the second signal is determined to be a low-level signal.

[0074] Optionally, the output terminal 121 of the Hall sensor 120 includes at least one port.

[0075] Please see Figure 8 , Figure 8This is a schematic diagram of another test circuit provided in an embodiment of this application. The test circuit includes a motor circuit 100, a data acquisition card 200, a current limiting circuit 300, and a filter circuit 400. The motor circuit 100 includes a three-phase power supply circuit 110, a DC power supply 117, a Hall sensor 120, and a current detection circuit 130. The three-phase power supply circuit 110 includes a first bridge arm 114, a second bridge arm 115, and a third bridge arm 116. The first bridge arm 114 includes a first switch S1 and a second switch S2. The second bridge arm 115 includes a third switch S3 and a fourth switch S4. The third bridge arm 116 includes a fifth switch S5 and a sixth switch S6. The data acquisition card 200 includes a fourth sampling terminal 204, a fifth sampling terminal 205, a sixth sampling terminal 206, and a detection terminal 207. The current limiting circuit 300 includes a first terminal 301, a second terminal 302, and a third terminal 303. The filter circuit 400 includes a first terminal 401, a second terminal 402, a third terminal 403, a fourth terminal 404, a fifth terminal 405, and a sixth terminal 406. The Hall sensor 120 includes an output terminal 121. The current detection circuit 130 includes a first terminal 131 and a second terminal 132. The first terminal of the first switch S1 is connected to the first terminals of the third switch S3 and the fifth switch S5, and the positive terminal of the DC power supply 117. The second terminal of the second switch S2 is connected to the second terminals of the fourth switch S4 and the sixth switch S6, and the first terminal 131 of the current detection circuit 130. The second terminal 132 of the current detection circuit 130 is connected to the negative terminal of the DC power supply 117. The second terminal of the first switch S1 is connected to the first terminal of the second switch S2, the first terminal 301 of the current limiting circuit 300, and the first terminal 401 of the filter circuit 400. The second terminal of the third switch S3 is connected to the first terminal of the fourth switch S4, the second terminal 132 of the current limiting circuit 300, and the first terminal 401 of the filter circuit 400. Terminal 302 is connected to the second terminal 402 of the filter circuit 400. The second terminal of the fifth switch S5 is connected to the first terminal of the sixth switch S6, the third terminal 303 of the current limiting circuit 300, and the third terminal 403 of the filter circuit 400. The fourth terminal 404 of the filter circuit 400 is connected to the fourth sampling terminal 204 of the data acquisition card 200. The fifth terminal 405 of the filter circuit 400 is connected to the fifth sampling terminal 205 of the data acquisition card 200. The sixth terminal 406 of the filter circuit 400 is connected to the sixth sampling terminal 206 of the data acquisition card 200. The output terminal 121 of the Hall sensor 120 is connected to the detection terminal 207 of the data acquisition card 200.

[0076] The current detection circuit 130 is used to monitor the current magnitude in the test circuit in real time. If any one of the first, second, or third paths is conducting and the current detection circuit 130 detects current, it is determined that the conducting path is normal.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be found in the relevant descriptions of other embodiments. It should be understood that the disclosed apparatus can be implemented in other ways based on the embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative.

[0078] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A test circuit, characterized by The test circuit is used to test the continuity of the motor circuit, and the test circuit includes: The motor circuit and the data acquisition card, wherein the motor circuit includes a three-phase power supply circuit; The first output terminal of the three-phase power supply circuit is connected to the first sampling terminal of the data acquisition card, the second output terminal of the three-phase power supply circuit is connected to the second sampling terminal of the data acquisition card, and the third output terminal of the three-phase power supply circuit is connected to the third sampling terminal of the data acquisition card. If the signal received at the first sampling end of the data acquisition card is a periodic signal, it is determined that the first path in the motor circuit is normal, and the first path passes through the first output end of the three-phase power supply circuit. If the signal received at the second sampling terminal of the data acquisition card is a periodic signal, it is determined that the second path in the motor circuit is normal, and the second path passes through the second output terminal of the three-phase power supply circuit; If the signal received at the third sampling terminal of the data acquisition card is a periodic signal, it is determined that the third path in the motor circuit is normal, and the third path passes through the third output terminal of the three-phase power supply circuit.

2. The test circuit of claim 1, wherein, The three-phase power supply circuit includes a DC power supply, a first bridge arm, a second bridge arm, and a third bridge arm; the test circuit includes a current limiting circuit. The first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected to the positive terminal of the DC power supply. The second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm are connected to the negative terminal of the DC power supply. The midpoint of the first bridge arm is connected to the first terminal of the current limiting circuit and the first sampling terminal of the data acquisition card. The midpoint of the second bridge arm is connected to the second terminal of the current limiting circuit and the second sampling terminal of the data acquisition card. The midpoint of the third bridge arm is connected to the third terminal of the current limiting circuit and the third sampling terminal of the data acquisition card.

3. The test circuit of claim 2, wherein, The first bridge arm includes a first switch and a second switch; the second bridge arm includes a third switch and a fourth switch; the third bridge arm includes a fifth switch and a sixth switch; the first end of the first switch is connected to the first end of the third switch and the first end of the fifth switch and the positive terminal of the DC power supply; the second end of the first switch is connected to the first end of the second switch, the first end of the current limiting circuit, and the first sampling end of the data acquisition card; the second end of the third switch is connected to the first end of the fourth switch, the second end of the current limiting circuit, and the second sampling end of the data acquisition card; the second end of the fifth switch is connected to the first end of the sixth switch, the third end of the current limiting circuit, and the third sampling end of the data acquisition card.

4. The test circuit of claim 3, wherein, When both the first switch and the fourth switch are closed, or when both the first switch and the sixth switch are closed, the first circuit is open; When both the third switch and the second switch are closed, or when both the third switch and the sixth switch are closed, the second path is activated; The third path is activated when both the fifth switch and the second switch are closed, or when both the fifth switch and the fourth switch are closed.

5. The test circuit of claim 3 or 4, characterized in that, The signals received by the first sampling terminal, second sampling terminal, and third sampling terminal of the data acquisition card are all square wave signals. The test circuit also includes: Filtering circuit; The first terminal of the filter circuit is connected to the second terminal of the first switch, the first terminal of the second switch, and the first terminal of the current limiting circuit. The second terminal of the filter circuit is connected to the second terminal of the third switch, the first terminal of the fourth switch, and the second terminal of the current limiting circuit. The third terminal of the filter circuit is connected to the second terminal of the fifth switch, the first terminal of the sixth switch, and the third terminal of the current limiting circuit. The fourth terminal of the filter circuit is connected to the fourth sampling terminal of the data acquisition card. The fifth terminal of the filter circuit is connected to the fifth sampling terminal of the data acquisition card. The sixth terminal of the filter circuit is connected to the sixth sampling terminal of the data acquisition card.

6. The test circuit of any one of claims 1-4, wherein, The motor circuit also includes: Hall effect sensor; The output terminal of the Hall sensor is connected to the detection terminal of the data acquisition card.

7. The test circuit of claim 6, wherein, The Hall sensor receives a first instruction and outputs a first signal to the data acquisition card according to the first instruction. The first instruction is used to instruct the Hall sensor to output a high-level signal. When the Hall sensor receives the first instruction and the first signal received by the data acquisition card is a high-level signal, it is determined that the fourth path in the motor circuit is normal, and the fourth path passes through the Hall sensor.

8. The test circuit of claim 6, wherein, The Hall sensor receives a second instruction and outputs a second signal to the data acquisition card according to the first instruction. The first instruction is used to instruct the Hall sensor to output a low-level signal. When the Hall sensor receives the second instruction and the second signal received by the data acquisition card is a low-level signal, it is determined that the fourth path in the motor circuit is normal, and the fourth path passes through the Hall sensor.

9. The test circuit of claim 3 or 4, wherein, The current limiting circuit includes: First resistor, second resistor, and third resistor; The first end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor. The second end of the first resistor is connected to the second end of the first switch, the first end of the second switch and the first sampling end of the data acquisition card. The second end of the second resistor is connected to the second end of the third switch, the first end of the fourth switch and the second sampling end of the data acquisition card. The second end of the third resistor is connected to the second end of the fifth switch, the first end of the sixth switch and the third sampling end of the data acquisition card.

10. The test circuit of claim 3 or 4, wherein, The current limiting circuit also includes: The fourth resistor, the fifth resistor, and the sixth resistor; The second end of the first switch is connected to the first end of the second switch, the first sampling end of the data acquisition card, the first end of the fourth resistor, and the first end of the fifth resistor. The second end of the third switch is connected to the first end of the fourth switch, the second sampling end of the data acquisition card, the second end of the fourth resistor, and the first end of the sixth resistor. The second end of the fifth switch is connected to the first end of the sixth switch, the third sampling end of the data acquisition card, the second end of the fifth resistor, and the second end of the sixth resistor.

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