A system for injecting spike voltage test that meets the MIL-STD-1275F standard

Abstract

The application discloses an injection peak voltage test system satisfying the MIL-STD-1275F standard, which comprises a peak signal generator, a power supply, a test device and a line impedance stabilization network; the peak output end of the peak signal generator is connected to the test device and connected to the power supply through the line impedance stabilization network; the peak signal generator comprises a peak signal generation network, an AC / DC voltage adjustment module and a power supply safety protection module connected in sequence, wherein the power supply safety protection module is connected to an external power supply; the peak signal generation network comprises a first standard selection module, a polarity switching module, a second standard selection module, a timer module and a third standard selection module. The application solves the problem that there is no system capable of satisfying the injection voltage peak project test capability of the latest MIL-STD-1275F standard in the industry at present, and can be compatible with the MIL-STD-1275 historical version and the GJB298-87 standard, thereby helping the technical localization of the injection peak voltage test system.

Description

Technical Field

[0001] This invention belongs to the technical field of injection voltage spike testing, specifically relating to an injection spike voltage test system that meets the MIL-STD-1275F standard. Background Technology

[0002] The power supply compatibility of military vehicles determines their functional performance and even safety. The U.S. military has a long history of development in this area. The U.S. military standard MIL-STD-1275 is the most fundamental power supply compatibility standard for military vehicles in the United States. In 1976, the U.S. Department of Defense released MIL-STD-1275A (the first version), which has been improved and developed through MIL-STD-1275B, MIL-STD-1275C, MIL-STD-1275D, MIL-STD-1275E, and MIL-STD-1275F (the latest version was released in 2022), and has been widely used.

[0003] Section 5.3.3.1 of the MIL-STD-1275 standard specifies the test requirements for "injected voltage spikes" on vehicle-mounted equipment. This test is used to determine whether the vehicle-mounted equipment can withstand interference from voltage spike signals coupled in the installation environment. In the injected voltage spike test specified in the standard, a "spiking voltage" needs to be injected into the equipment's power interface through direct coupling. This spike voltage needs to reach certain peak values, rise times, durations, and oscillation frequencies. Currently, there are no test systems, either domestically or internationally, that meet these standard requirements.

[0004] Currently, the MIL-STD-1275 standard includes versions MIL-STD-1275A, MIL-STD-1275B, MIL-STD-1275C, MIL-STD-1275D, MIL-STD-1275E, and the latest MIL-STD-1275F. In the MIL-STD-1275F version, the "Injected Peak Voltage" item has resolved the problems that existed in previous versions (such as: no waveform parameter constraints for injected peak voltage, unreasonable energy requirements for injected peak voltage, etc.). The "Injected Peak Voltage" item has been fully improved in the MIL-STD-1275F version.

[0005] MIL-STD-1275F was promulgated in 2022, and there are currently no testing systems, either domestically or internationally, that meet the requirements of this standard. Summary of the Invention

[0006] The main objective of this invention is to overcome the shortcomings and deficiencies of the prior art and provide an injection spike voltage test system that meets the MIL-STD-1275F standard.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: One aspect of the present invention provides an injection spike voltage test system that meets the MIL-STD-1275F standard, including a spike signal generator, a power supply, a device under test, and a line impedance stabilization network; The spike output terminal of the spike signal generator is connected to the device under test and is connected to the power supply through a line impedance stabilization network. The spike signal generator includes a spike signal generation network, an AC / DC voltage regulation module, and a power supply safety protection module connected in sequence, wherein the power supply safety protection module is connected to an external power source. The spike signal generation network includes a first standard selection module, a polarity switching module, a second standard selection module, a timer module, and a third standard selection module.

[0008] As a preferred technical solution, the voltage output by the AC / DC voltage regulation module is connected to the input terminal of the spike signal generation network through a parallel voltmeter, and the positive terminal is connected to the polarity switching module through the first standard selection module, and the negative terminal is connected to the polarity switching module; the polarity switching module is connected in parallel with the second standard selection module and the GJB298 capacitor, and the positive terminal is connected to the positive terminal of the device under test through a series timer module, and the negative terminal is connected to the negative terminal of the device under test; the positive terminal of the device under test is also connected in series with the third standard selection module.

[0009] As a preferred technical solution, the first standard selection module selects series resistors of different resistance values ​​by means of a switch.

[0010] As a preferred technical solution, the polarity switching module selects the path via a switch, as follows: Path 1: The positive voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the negative voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test; Path 2: The negative voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the positive voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test.

[0011] As a preferred technical solution, the second standard selection module selects between grounding and connection via a switch, and a MIL1275F capacitor is connected in series with the negative terminal of the device under test.

[0012] As a preferred technical solution, the timer module includes a GJB298 timer and a MIL1275F timer connected in parallel.

[0013] As a preferred technical solution, the third standard selection module is directly connected to or connected in series with an LR circuit via a switch, and the LR circuit includes an inductor and a resistor connected in parallel.

[0014] As a preferred technical solution, the input terminal of the AC / DC voltage regulation module is connected to an adjustable transformer; the adjustable transformer is connected to the output terminal through a parallel RC network. The RC network includes a first RC circuit, a second RC circuit, a third RC circuit, and a fourth RC circuit connected in series, wherein the first RC circuit is connected to the positive terminal of the output terminal and the fourth RC circuit is connected to the negative terminal of the output terminal. The positive terminal of the adjustable transformer is connected to the positive terminal of the output terminal through four different paths 1, each path 1 including a diode connected in series in the forward direction; the positive terminal of the adjustable transformer is also connected to the negative terminal of the output terminal through four different paths 2, each path including a diode connected in series in the reverse direction. The negative terminal of the adjustable transformer is connected to the positive terminal of the output through the fifth RC circuit and the diodes placed in the four different paths 1 respectively; the negative terminal of the adjustable transformer is also connected to the negative terminal of the output through the sixth RC circuit and the diodes placed in the four different paths 2 respectively. Each RC circuit includes resistors and capacitors connected in parallel; The negative terminal of the output is grounded.

[0015] As a preferred technical solution, the input terminal of the power supply safety protection module is connected in sequence to a power switch and fuse connected in series, a transient suppression diode connected in parallel, a capacitor connected in parallel, a resistor connected in parallel, and a transformer connected in parallel, which are then connected to the output terminal; the positive and negative terminals of the transformer are both connected to the output terminal through an inductor and grounded through a capacitor.

[0016] As a preferred technical solution, when the power line of the tested equipment has a separate return line, two line impedance stabilization networks are set up, specifically: The spike output terminal of the spike signal generator is connected to the device under test and is connected to the power supply through the first line impedance stabilization network. The device under test is connected to the power supply through a second line impedance stabilization network.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) This invention solves the problem that there is currently no system in the industry that can meet the testing capability of the "MIL-STD-1275F latest standard injection voltage spike item"; (2) This invention is compatible with both historical versions of MIL-STD-1275 and the GJB298-87 standard (the technical requirements are equivalent to the requirements of MIL-STD-1275A), and can be widely used in the testing of the above standards.

[0018] (3) This invention helps to localize the technology of the “injection peak voltage” test system, promotes the development of domestic technology, and helps my country to be independent in this field.

[0019] (4) This invention contributes to the technical upgrade of the GJB298 standard. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the spike waveform required by the injection spike voltage test system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the single-line impedance stabilization network configuration test according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the dual-line impedance stabilization network configuration test according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the GJB298 configuration test system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the power supply safety protection module according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the AC / DC voltage regulation module according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the spike signal generator according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the actual test waveform (positive polarity) of an embodiment of the present invention; Figure 9 This is a schematic diagram of the actual test waveform (negative polarity) of an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0022] This invention provides an injection spike voltage test system that meets the requirements of the MIL-STD-1275F standard, while also being compatible with the "injection spike voltage" requirements of the GJB298-87 standard and previous versions of MIL-STD-1275.

[0023] Specifications of the "Injection Peak Voltage" test system: a) Peak pulse voltage amplitude: covers ±250V and is continuously adjustable from ±100V to ±250V; b) Peak rise time: ≤50ns; c) Peak oscillation frequency: within the range of 20kHz to 500kHz; d) Peak repetition frequency: 1Hz ± 20%; e) Peak polarity: positive, negative; f) Spike waveform: see Figure 1 ; h) Energy of a single spike: not less than 200 mJ.

[0024] Example: This embodiment provides an injection spike voltage test system that meets the MIL-STD-1275F standard, including a spike signal generator, a power supply, a device under test, and a line impedance stabilization network (hereinafter referred to as LISN).

[0025] The spike signal generator includes a spike signal generation network, an AC / DC voltage regulation module, and a power supply safety protection module connected in sequence, wherein the power supply safety protection module is connected to an external power supply of AC220V±20%, 50Hz.

[0026] The spike signal generation network includes a first standard selection module, a polarity switching module, a second standard selection module, a timer module, and a third standard selection module.

[0027] The voltage output by the AC / DC voltage regulation module is connected to the input of the spike signal generation network via a parallel voltmeter. The positive terminal is connected to the polarity switching module via the first standard selection module, and the negative terminal is connected to the polarity switching module. The polarity switching module is connected in parallel with the second standard selection module and a GJB298 capacitor. The positive terminal is connected to the positive terminal of the device under test via a series timer module, and the negative terminal is connected to the negative terminal of the device under test. The positive terminal of the device under test is also connected in series with the third standard selection module.

[0028] As a preferred embodiment, such as Figure 2As shown, for the return current method of the device under test housing, a LISN is set up. The peak output terminal of the peak signal generator is connected to the device under test, and is connected to the power supply through the line impedance stabilization network, and grounded through an 8uF capacitor.

[0029] The power supply side of the spike signal generator is also connected in parallel with a capacitor (set to 8uF in this embodiment).

[0030] As a preferred embodiment, such as Figure 3 As shown, for the power line of the device under test, two LISNs are set up. The peak output terminal of the spike signal generator is connected to the device under test and connected to the power supply through the first line impedance stabilization network. The device under test is connected to the power supply through the second line impedance stabilization network. An 8uF capacitor is connected in parallel between the two line impedance stabilization networks.

[0031] The power supply side of the spike signal generator is also connected in parallel with a capacitor (set to 8uF in this embodiment).

[0032] Furthermore, the first standard selection module selects series resistors of different resistance values ​​via a switch. In this embodiment, path 1 uses a 5kΩ resistor, and path 2 uses a 100kΩ resistor. The switch is not connected to the positive or negative terminals to indicate that it is floating or grounded.

[0033] Furthermore, the polarity switching module selects the path via a polarity switching switch, as detailed below: Path 1: The positive voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the negative voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test; Path 2: The negative voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the positive voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test.

[0034] Furthermore, such as Figure 4 As shown, the second standard selection module selects between grounding and connection via a switch, and a MIL1275F capacitor (set to 8.1uF in this embodiment) is connected in series to the negative terminal of the device under test.

[0035] Furthermore, such as Figure 4 As shown, the timer module includes a GJB298 timer and a MIL1275F timer connected in parallel.

[0036] Furthermore, such as Figure 4As shown, the third standard selection module is directly connected to or connected in series with an LR circuit via a switch. The LR circuit includes an inductor and a resistor connected in parallel. Specifically, in this embodiment, the inductor is set to 5uH and the resistor to 50Ω.

[0037] Furthermore, such as Figure 5 As shown, the input terminal of the AC / DC voltage regulation module is connected to an adjustable transformer; the adjustable transformer is connected to the output terminal through a parallel RC network. The RC network includes a first RC circuit, a second RC circuit, a third RC circuit, and a fourth RC circuit connected in series, wherein the first RC circuit is connected to the positive terminal of the output terminal and the fourth RC circuit is connected to the negative terminal of the output terminal. The positive terminal of the adjustable transformer is connected to the positive terminal of the output terminal through four different paths 1, each path 1 including a diode connected in series in the forward direction; the positive terminal of the adjustable transformer is also connected to the negative terminal of the output terminal through four different paths 2, each path including a diode connected in series in the reverse direction. The negative terminal of the adjustable transformer is connected to the positive terminal of the output through the fifth RC circuit and the diodes placed in the four different paths 1 respectively; the negative terminal of the adjustable transformer is also connected to the negative terminal of the output through the sixth RC circuit and the diodes placed in the four different paths 2 respectively. Each RC circuit includes resistors and capacitors connected in parallel; The negative terminal of the output is grounded.

[0038] Furthermore, in this embodiment, the capacitors in the first RC circuit, second RC circuit, third RC circuit, fourth RC circuit, fifth RC circuit, and sixth RC circuit are all electrolytic capacitors, and the resistors are all set to 330kΩ; wherein, the capacitance value of the capacitors in the first RC circuit, second RC circuit, third RC circuit, and fourth RC circuit is 390uF, and the capacitance value of the capacitors in the fifth RC circuit and sixth RC circuit is 220uF.

[0039] Furthermore, such as Figure 6 As shown, the input terminal of the power supply safety protection module is connected in series with a power switch and a fuse, in parallel with a transient suppression diode, in parallel with a capacitor, in parallel with a resistor, and in parallel with a transformer, which are then connected to the output terminal. The positive and negative terminals of the transformer are both connected to the output terminal through an inductor and grounded through a capacitor.

[0040] As a preferred embodiment, such as Figure 7 As shown, the spike output terminal and spike reference level terminal of the spike signal generator in this embodiment are connected to the device under test to perform GJB298 configuration tests, which are compatible with the GJB298-87 standard.

[0041] By using the injection spike voltage test system of the present invention that meets the MIL-STD-1275F standard, the actual tested spike waveform is as follows: Figure 8 , Figure 9 As shown, the measured waveform fully meets the "Injection Spike Voltage" requirement of the MIL-STD-1275F standard.

[0042] It should be noted that the system provided in the above embodiments is only an example of the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure can be divided into different functional modules to complete all or part of the functions described above. This system uses the MIL-STD-1275F standard for injection spike voltage testing.

[0043] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0044] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An injection spike voltage test system conforming to the MIL-STD-1275F standard, characterized in that, This includes a spike signal generator, a power supply, the device under test, and a line impedance stabilization network; The spike output terminal of the spike signal generator is connected to the device under test and is connected to the power supply through a line impedance stabilization network. The spike signal generator includes a spike signal generation network, an AC / DC voltage regulation module, and a power supply safety protection module connected in sequence, wherein the power supply safety protection module is connected to an external power source. The spike signal generation network includes a first standard selection module, a polarity switching module, a second standard selection module, a timer module, and a third standard selection module.

2. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 1, characterized in that, The voltage output by the AC / DC voltage regulation module is connected to the input of the spike signal generation network via a parallel voltmeter. The positive terminal is connected to the polarity switching module via the first standard selection module, and the negative terminal is connected to the polarity switching module. The polarity switching module is connected in parallel with the second standard selection module and a GJB298 capacitor. The positive terminal is connected to the positive terminal of the device under test via a series timer module, and the negative terminal is connected to the negative terminal of the device under test. The positive terminal of the device under test is also connected in series with the third standard selection module.

3. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 2, characterized in that, The first standard selection module selects series resistors of different resistance values ​​via a switch.

4. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 2, characterized in that, The polarity switching module selects the path via a switch, as follows: Path 1: The positive voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the negative voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test; Path 2: The negative voltage output by the AC / DC voltage regulator module is connected to the positive terminal of the device under test, and the positive voltage output by the AC / DC voltage regulator module is connected to the negative terminal of the device under test.

5. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 2, characterized in that, The second standard selection module selects between grounding and connection via a switch, and a MIL1275F capacitor is connected in series with the negative terminal of the device under test.

6. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 2, characterized in that, The timer module includes a GJB298 timer and a MIL1275F timer connected in parallel.

7. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 2, characterized in that, The third standard selection module is directly connected to or connected in series with an LR circuit via a switch. The LR circuit includes an inductor and a resistor connected in parallel.

8. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 1, characterized in that, The input terminal of the AC / DC voltage regulation module is connected to an adjustable transformer; the adjustable transformer is connected to the output terminal through a parallel RC network. The RC network includes a first RC circuit, a second RC circuit, a third RC circuit, and a fourth RC circuit connected in series, wherein the first RC circuit is connected to the positive terminal of the output terminal and the fourth RC circuit is connected to the negative terminal of the output terminal. The positive terminal of the adjustable transformer is connected to the positive terminal of the output terminal through four different paths 1, each path 1 including a diode connected in series in the forward direction; the positive terminal of the adjustable transformer is also connected to the negative terminal of the output terminal through four different paths 2, each path including a diode connected in series in the reverse direction. The negative terminal of the adjustable transformer is connected to the positive terminal of the output through the fifth RC circuit and the diodes placed in the four different paths 1 respectively; the negative terminal of the adjustable transformer is also connected to the negative terminal of the output through the sixth RC circuit and the diodes placed in the four different paths 2 respectively. Each RC circuit includes resistors and capacitors connected in parallel; The negative terminal of the output is grounded.

9. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 1, characterized in that, The input terminal of the power supply safety protection module is connected in series with a power switch and a fuse, in parallel with a transient suppression diode, in parallel with a capacitor, in parallel with a resistor, and in parallel with a transformer, which are then connected to the output terminal. The positive and negative terminals of the transformer are both connected to the output terminal through an inductor and grounded through a capacitor.

10. The injection spike voltage test system conforming to the MIL-STD-1275F standard according to claim 1, characterized in that, When the power line of the device under test has a separate return line, two line impedance stabilization networks are set up, specifically: The spike output terminal of the spike signal generator is connected to the device under test and is connected to the power supply through the first line impedance stabilization network. The device under test is connected to the power supply through a second line impedance stabilization network.

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