Test circuit board for flexible gyroscope amplification circuit board

Abstract

The utility model discloses a test circuit board for a flexible gyroscope amplification circuit board, which comprises a test circuit and an installation interface, the test circuit comprises a power supply module and a test signal switching module, the power supply module is connected with the power supply end of a discharge circuit board, and the test signal switching module is connected with the installation interface. The test signal switching module comprises a test signal change-over switch, a first signal test point and a second signal test point, the first input end of the test signal change-over switch is grounded, the second input end of the test signal change-over switch inputs an excitation signal consistent with the frequency of the flexible gyroscope, and the output end of the test signal change-over switch is electrically connected with the signal input end of the amplification circuit board; the first signal output end of the amplification circuit board is connected with the first signal test point, and the second signal output end is connected with the second signal test point. According to the scheme, the zero position test is not influenced by electromagnetic interference signals of the flexible gyroscope, the test accuracy is improved, and meanwhile, non-linearity test and lossless installation can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of communication and navigation, in particular to a test circuit board for a flexible gyroscope amplification circuit board. Background Art

[0002] The continuous development of national defense technology has led to the emergence of a wide range of new, miniaturized, and low-cost guidance equipment. These devices place specific demands on the size and cost of their guidance components. Flexible gyroscopes, as core components of guidance systems, are facing increasingly stringent requirements for size. Because the raw output signal of a flexible gyroscope is particularly weak and easily affected by external interference and power supply noise, which can lead to distortion, an amplifier circuit board is often installed within the flexible gyroscope to amplify the raw signal and ensure effective output of the flexible gyroscope's test signal.

[0003] Due to the compact internal space of the flexible gyroscope, the installation and wiring method of the amplifier circuit board is relatively special. The amplifier circuit board is generally a round circuit board, as shown in the attached figure. Figure 1 As shown, there are 18 connection holes evenly distributed on the outer circle of the amplifier circuit board. These 18 connection holes are directly soldered to the internal terminals of the flexible gyroscope, serving the dual purpose of connecting electrical signals and fixing the amplifier circuit board. Because some amplifier circuit boards undergo aging tests during the production process, which can cause significant parameter changes or abnormal functional performance of the electronic components within them, the amplifier circuit board must be tested for functional performance. The existing testing method requires directly soldering the amplifier circuit board to the terminal of the flexible gyroscope for direct testing. This testing method has several shortcomings: 1. Low test efficiency; 2. Repeated soldering and cleaning will reduce the reliability of the amplifier circuit board; 3. When performing a zero-position test on the amplifier circuit board, the electromagnetic interference signal from the flexible gyroscope's own rotation will cause inaccurate test results; 4. Standard gradient nonlinearity testing cannot be performed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a test circuit board for a flexible gyroscope amplification circuit board that will not be affected by the electromagnetic interference signal of the flexible gyroscope during zero-position testing and improves the test accuracy.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A test circuit board for a flexible gyroscope amplification circuit board comprises a test circuit and a mounting interface. The amplification circuit board is electrically connected to the test circuit via the mounting interface. The test circuit comprises a power supply module and a test signal switching module. The power supply module is connected to the power supply end of a discharge circuit board and is used to supply power to the discharge circuit board. The test signal switching module comprises a test signal switching switch, a first signal test point, and a second signal test point. The test signal switching switch is a double-pole double-throw switch, and a first input end of the test signal switching switch is grounded, and an excitation signal consistent with the frequency of the flexible gyroscope is input to the second input end. The output end of the test signal switching switch is used to electrically connect to the signal input end of the amplification circuit board, the first signal output end of the amplification circuit board is connected to the first signal test point, and the second signal output end of the amplification circuit board is connected to the second signal test point.

[0007] Thus, to achieve a true zero-position test of the amplifier circuit board, this solution does not directly connect the amplifier circuit board to the flexible gyroscope for testing. Instead, a separate test circuit is constructed. A mounting interface is provided on the test circuit board, which is then connected to the amplifier circuit board using the mounting interface. A power supply module is used to power the amplifier circuit board to ensure normal operation of the amplifier circuit board. A double-pole double-throw switch is then used to switch the test signal. When performing a zero-position test of the amplifier circuit board, the double-pole double-throw switch is switched to a position where its first input terminal serves as the input signal, grounding the signal input terminal of the amplifier circuit board. The signals at the two signal output terminals of the amplifier circuit board are the zero-position signals of the amplifier circuit board, and the first and second signal test points measure the AC zero-position signal and DC zero-position signal of the amplifier circuit board, respectively. Because the zero-position test of this solution is not achieved by connecting the test circuit board to the flexible gyroscope, the zero-position signal measured by this solution is not affected by the electromagnetic interference signal of the flexible gyroscope, thereby improving the accuracy of the test.

[0008] Preferably, the output end of the double-pole double-throw switch is electrically connected to the signal input end of the amplifier circuit board through a signal conditioning module. The signal conditioning module includes an adjustable resistor R1, a resistor R2, a resistor R3, a third signal test point and a fourth signal test point. One end of the resistor R2 and the third signal test point are both connected to the output end of the double-pole double-throw switch when its second input end is used as an input signal, one end of the resistor R3 is connected to the output end of the double-pole double-throw switch when its first input end is used as an input signal, the other end of the resistor R2 is connected to the fixed end of the adjustable resistor R1, the other end of the resistor R3 is connected to the movable end of the adjustable resistor R1, and the movable end of the adjustable resistor R1 and the fourth signal test point are both connected to the signal input end of the amplifier circuit board.

[0009] Thus, when testing the nonlinearity of the amplifier circuit board, the double-pole double-throw switch is switched to the second input terminal as the input signal position. At this time, an excitation signal consistent with the frequency of the flexible gyroscope is input to the second input terminal. This excitation signal is further input to the signal input terminal of the amplifier circuit board. The test signal output by the amplifier circuit board is the signal amplified by the amplifier circuit board, and this signal is tested through the first and second signal test points. Furthermore, by providing an adjustable resistor R1, the test signal magnitude can be adjusted by adjusting the adjustable resistor R1. The third signal test point is the original signal magnitude of the excitation signal, the fourth signal test point is the signal magnitude after adjusting the adjustable resistor R1, and the first and second signal test points are the signals adjusted by the adjustable resistor R1 (i.e., the signal at the fourth signal test point) and then passed through the amplifier circuit board. By adjusting the resistance of the adjustable resistor R1 so that the signal at the fourth signal test point has multiple linear values, the signals tested at the first and second signal test points are the amplified signals corresponding to the multiple values. The nonlinearity calculated from the multiple values ​​is the nonlinearity of the amplifier circuit board.

[0010] Preferably, the power supply module includes a three-pole three-throw switch, a diode D1 and a diode D2, the first input end of the three-pole three-throw switch is grounded, the second input end is connected to a +15V power supply, and the third input end is connected to a -15V power supply. The output end of the three-pole three-throw switch when its first input end is used as an input signal is connected to the ground end of the amplifier circuit board, the anode of the diode D1 is connected to the output end of the three-pole three-throw switch when its second input end is used as an input signal, the cathode of the diode D1 is connected to the +15V port of the amplifier circuit board, the cathode of the diode D2 is connected to the output end of the three-pole three-throw switch when its third input end is used as an input signal, and the anode of the diode D2 is connected to the -15V port of the amplifier circuit board.

[0011] Preferably, the cathode of the diode D1 is also connected to a resistor R4, the other end of the resistor R4 is connected to the anode of the light-emitting diode LED1, the cathode of the light-emitting diode LED1 is connected to the ground terminal of the amplifier circuit board, and the anode of the diode D2 is also connected to a resistor R5, the other end of the resistor R5 is connected to the cathode of the light-emitting diode LED2, and the anode of the light-emitting diode LED2 is connected to the ground terminal of the amplifier circuit board.

[0012] In this way, when the second input terminal and the third input terminal of the three-pole three-throw switch respectively input +15V power supply and -15V power supply to the amplifier circuit board, the light-emitting diodes LED1 and LED2 will be in a constantly bright state, which can facilitate the operator's operation and fault judgment.

[0013] Preferably, the mounting interface includes a plurality of test mounting holes corresponding one-to-one to the connection holes on the amplifying circuit board, and a retractable spring ejector pin is fixedly connected in the test mounting hole. A plurality of support rods are evenly distributed around the mounting interface, and an insulating pressure plate is connected to the support rods. The other end of the insulating pressure plate is used to abut against the amplifying circuit board and compress the retractable spring ejector pin to a limit height.

[0014] In this way, when testing the amplifier circuit board, a retractable spring push rod is set at each test mounting hole, and then the connection holes on the amplifier circuit board are installed on the retractable spring push rod one by one, and then the retractable spring push rod is compressed to the limit height using the insulating pressure plate. In this way, lossless installation between the retractable spring push rod and the connection hole can be achieved, that is, lossless installation of the amplifier circuit board can be achieved, avoiding the problem of reduced reliability of the amplifier circuit board caused by repeated welding in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an enlarged circuit board in the prior art;

[0016] Figure 2 This is a circuit diagram of a test circuit in a test circuit board for a flexible gyroscope amplifier circuit board according to the present invention;

[0017] Figure 3 This is a front schematic diagram of a test circuit board for a flexible gyroscope amplification circuit board of the present invention;

[0018] Figure 4 The utility model is a partial structural diagram of the connection between the mounting interface of the test circuit board of the flexible gyroscope amplifying circuit board and the amplifying circuit board.

[0019] Description of the accompanying drawings: test installation hole 1, support hole 2, retractable spring thimble 3, support rod 4, insulating pressure plate 5. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the utility model belongs.

[0021] The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] A test circuit board for a flexible gyroscope amplifying circuit board includes a test circuit and a mounting interface. The amplifying circuit board M1 is electrically connected to the test circuit via the mounting interface. Figure 2 As shown, the test circuit includes a power supply module and a test signal switching module. The power supply module is connected to the power supply end of the discharge circuit board M1 and is used to supply power to the discharge circuit board. The test signal switching module is used to realize the switching between the zero-position test and the nonlinearity test. The test signal switching module includes a test signal switching switch J2, a first signal test point CN1 and a second signal test point CN2. The test signal switching switch J2 is a double-pole double-throw switch, and the first input end of the test signal switching switch J2 is grounded, and the second input end inputs an excitation signal CSXH consistent with the frequency of the flexible gyroscope. The output end of the test signal switching switch J2 is used to be electrically connected to the signal input end of the amplifier circuit board M1, the first signal output end Xout of the amplifier circuit board M1 is connected to the first signal test point CN1, and the second signal output end Yout of the amplifier circuit board is connected to the second signal test point CN2.

[0023] The amplifier circuit board primarily uses the precision instrumentation op amp on the board to differentially amplify the leading (H) and trailing (L) signals of the flexible gyroscope's two sensor signals (XH, XL, YH, YL) to output the gyroscope's original signals. If the amplifier circuit board is directly connected to the flexible gyroscope for testing, even if the leading sensor terminal is short-circuited, the zero position of the test will still be accompanied by electromagnetic interference signals from the flexible gyroscope's own rotation, resulting in inaccurate test results and the inability to perform standard gradient nonlinearity testing. To achieve a true zero-position test of the amplifier circuit board, this solution does not directly connect the amplifier circuit board to the flexible gyroscope for testing. Instead, a separate test circuit is constructed. A mounting interface is provided on the test circuit board, which is then connected to the amplifier circuit board. A power supply module is used to power the amplifier circuit board to ensure normal operation of the amplifier circuit board. A double-pole double-throw switch is then used to switch the test signal. When performing the zero-position test of the amplifier circuit board, the double-pole double-throw switch is switched to a position where its first input terminal serves as the input signal, grounding the signal input terminal of the amplifier circuit board. The signals at the two signal output terminals of the amplifier circuit board are the zero-position signals of the amplifier circuit board, and the first and second signal test points measure the AC and DC zero-position signals of the amplifier circuit board, respectively. Because the zero-position test of this solution is not achieved by connecting to the flexible gyroscope, the zero-position signal measured by this solution is not affected by the electromagnetic interference signal of the flexible gyroscope, thereby improving the accuracy of the test.

[0024] In this embodiment, the output end of the double-pole double-throw switch is electrically connected to the signal input end of the amplifier circuit board through a signal conditioning module. The signal conditioning module includes an adjustable resistor R1, a resistor R2, a resistor R3, a third signal test point CN3 and a fourth signal test point CN4. One end of the resistor R2 and the third signal test point CN3 are both connected to the output end of the double-pole double-throw switch J2 when its second input end is used as an input signal (i.e., the input excitation signal CSXH). One end of the resistor R3 is connected to the output end of the double-pole double-throw switch J2 when its first input end is used as an input signal (i.e., the ground signal). The other end of the resistor R2 is connected to the fixed end of the adjustable resistor R1, and the other end of the resistor R3 is connected to the movable end of the adjustable resistor R1. The movable end of the adjustable resistor R1 and the fourth signal test point CN4 are both connected to the signal input ends (XH and YH) of the amplifier circuit board M1.

[0025] In this way, when conducting a nonlinearity test on the amplifier circuit board M1, the double-pole double-throw switch J2 is switched to the second input end as the input signal position. At this time, the excitation signal CSXH consistent with the frequency of the flexible gyroscope is input to the second input end. The excitation signal is further input to the signal input end of the amplifier circuit board M1. At this time, the test signal output by the amplifier circuit board M1 is the signal amplified by the amplifier circuit board M1, and the signal is tested through the first signal test point CN1 and the second signal test point CN2. In addition, by setting the adjustable resistor R1, the test signal size can be adjusted by adjusting the adjustable resistor R1, wherein the third signal test point CN3 is the original signal size of the excitation signal, and the fourth signal test point CN4 is the signal size after adjusting the adjustable resistor R1. The first signal test point CN1 and the second signal test point CN2 are the signals adjusted by the adjustable resistor R1 (that is, the signal of the fourth signal test point CN4) and then passed through the amplifying circuit board M1. By adjusting the resistance value of the adjustable resistor R1, when the signal of the fourth signal test point CN4 is a linear multiple set of values, then the first signal test point CN1 and the second signal test point CN2 test the signals after amplification of the corresponding multiple sets of values. The nonlinearity calculated from the multiple sets of values ​​is the nonlinearity of the amplifying circuit board M1. For example, when the fourth signal test point CN4 is adjusted to 20mV, 50mV, 100mV, 200mV, 500mV, and 1000mV respectively, the first signal test point CN1 and the second signal test point CN2 are tested for 6 groups of output signal sizes, thereby calculating the nonlinearity of the amplifier circuit board M1.

[0026] In this embodiment, the power supply module includes a three-pole, three-throw switch J1, a diode D1, and a diode D2. The first input terminal of the three-pole, three-throw switch J1 is grounded, the second input terminal is connected to a +15V power supply, and the third input terminal is connected to a -15V power supply. The output terminal of the three-pole, three-throw switch J1 when its first input terminal is used as an input signal (i.e., a ground signal) is connected to the ground terminal GND of the amplifier circuit board M1. The anode of the diode D1 is connected to the output terminal of the three-pole, three-throw switch J1 when its second input terminal is used as an input signal (i.e., a +15V power supply terminal). The cathode of the diode D1 is connected to the +15V port of the amplifier circuit board M1. The cathode of the diode D2 is connected to the output terminal of the three-pole, three-throw switch J1 when its third input terminal is used as an input signal (i.e., a -15V power supply terminal). The anode of the diode D2 is connected to the -15V port of the amplifier circuit board M1.

[0027] In this embodiment, the cathode of the diode D1 is also connected to the resistor R4, the other end of the resistor R4 is connected to the anode of the light-emitting diode LED1, the cathode of the light-emitting diode LED1 is connected to the ground terminal of the amplifier circuit board M1, and the anode of the diode D2 is also connected to the resistor R5, the other end of the resistor R5 is connected to the cathode of the light-emitting diode LED2, and the anode of the light-emitting diode LED2 is connected to the ground terminal of the amplifier circuit board M1.

[0028] In this way, when the second input terminal and the third input terminal of the three-pole three-throw switch J1 respectively input +15V power and -15V power to the amplifier circuit board, the light-emitting diodes LED1 and LED2 will be in a constantly bright state, which can facilitate the operator's operation and fault judgment.

[0029] As attached Figure 3 and attached Figure 4 As shown, in this embodiment, the mounting interface includes a plurality of test mounting holes 1 corresponding one-to-one to the connection holes on the amplifier circuit board M1, and a retractable spring ejector pin 3 is fixedly connected in the test mounting hole 1. A plurality of support holes 2 are evenly distributed around the mounting interface, and a support rod 4 is connected in the support hole 2. An insulating pressure plate 5 is connected to the support rod 4, and the other end of the insulating pressure plate 5 is used to abut against the amplifier circuit board M1 and compress the retractable spring ejector pin 3 to a limit height.

[0030] In this way, when testing the amplifier circuit board, a retractable spring push rod 3 is set at each test mounting hole 1, and then the connection holes on the amplifier circuit board M1 are installed one by one on the retractable spring push rod 3, and then the retractable spring push rod 3 is compressed to the limit height using the insulating pressure plate 5. In this way, lossless installation between the retractable spring push rod 3 and the connection hole can be achieved, that is, lossless installation of the amplifier circuit board M1, avoiding the problem of reducing the reliability of the amplifier circuit board caused by repeated welding in the prior art.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A test circuit board for a flexible gyroscope amplifier circuit board, characterized in that: It includes a test circuit and an installation interface, and the amplifier circuit board is electrically connected to the test circuit through the installation interface. The test circuit includes a power supply module and a test signal switching module. The power supply module is connected to the power supply end of the discharge circuit board and is used to supply power to the discharge circuit board. The test signal switching module includes a test signal switching switch, a first signal test point and a second signal test point. The test signal switching switch is a double-pole double-throw switch, and the first input end of the test signal switching switch is grounded, and the second input end inputs an excitation signal consistent with the frequency of the flexible gyroscope. The output end of the test signal switching switch is used to be electrically connected to the signal input end of the amplifier circuit board, the first signal output end of the amplifier circuit board is connected to the first signal test point, and the second signal output end of the amplifier circuit board is connected to the second signal test point.

2. The test circuit board for the flexible gyroscope amplification circuit board according to claim 1, characterized in that: The output end of the double-pole double-throw switch is electrically connected to the signal input end of the amplifier circuit board through a signal conditioning module. The signal conditioning module includes an adjustable resistor R1, a resistor R2, a resistor R3, a third signal test point and a fourth signal test point. One end of the resistor R2 and the third signal test point are both connected to the output end of the double-pole double-throw switch when its second input end is used as an input signal. One end of the resistor R3 is connected to the output end of the double-pole double-throw switch when its first input end is used as an input signal. The other end of the resistor R2 is connected to the fixed end of the adjustable resistor R1, and the other end of the resistor R3 is connected to the movable end of the adjustable resistor R1. The movable end of the adjustable resistor R1 and the fourth signal test point are both connected to the signal input end of the amplifier circuit board.

3. The test circuit board for a flexible gyroscope amplifying circuit board according to claim 1, characterized in that: The power supply module includes a three-pole three-throw switch, a diode D1 and a diode D2. The first input end of the three-pole three-throw switch is grounded, the second input end is connected to a +15V power supply, and the third input end is connected to a -15V power supply. The output end of the three-pole three-throw switch when its first input end is used as an input signal is connected to the ground end of the amplifier circuit board. The anode of the diode D1 is connected to the output end of the three-pole three-throw switch when its second input end is used as an input signal. The cathode of the diode D1 is connected to the +15V port of the amplifier circuit board. The cathode of the diode D2 is connected to the output end of the three-pole three-throw switch when its third input end is used as an input signal. The anode of the diode D2 is connected to the -15V port of the amplifier circuit board.

4. The test circuit board for a flexible gyroscope amplifying circuit board according to claim 3, characterized in that: The cathode of the diode D1 is also connected to a resistor R4, the other end of the resistor R4 is connected to the anode of the light-emitting diode LED1, the cathode of the light-emitting diode LED1 is connected to the ground terminal of the amplifier circuit board, and the anode of the diode D2 is also connected to a resistor R5, the other end of the resistor R5 is connected to the cathode of the light-emitting diode LED2, and the anode of the light-emitting diode LED2 is connected to the ground terminal of the amplifier circuit board.

5. The test circuit board for a flexible gyroscope amplifying circuit board according to claim 1, characterized in that: The mounting interface includes a plurality of test mounting holes corresponding one-to-one to the connection holes on the amplifying circuit board. A retractable spring ejector pin is fixedly connected in the test mounting hole. A plurality of support rods are evenly distributed around the mounting interface. An insulating pressure plate is connected to the support rods. The other end of the insulating pressure plate is used to abut against the amplifying circuit board and compress the retractable spring ejector pin to a limit height.

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