A power cycle test bench suitable for vibration table power amplifier testing

Abstract

The present invention discloses a power cycle test bench suitable for testing a vibration table power amplifier, which relates to the field of power electronics and the field of inverters, including a vibration table power amplifier device for testing three-phase AC power grid power supply, a power cycle converter device for providing vibration table back electromotive force simulation capability and power cycle function, and a supercapacitor energy storage device; one end of the vibration table power amplifier device for testing three-phase AC power grid power supply is connected to the three-phase power grid, and the other end is connected to the power cycle converter device, the power cycle converter device is connected to the supercapacitor energy storage device, and the other end of the power cycle converter device is connected to the three-phase power grid. The present invention provides a test bench that solves the problem that under conventional laboratory conditions, it is impossible to obtain actual vibration table samples and that the mechanical part of the vibration table is difficult to dock and test. The purpose of simulating the mechanical properties of the vibration table under conventional laboratory conditions to complete the test platform of the power amplifier is achieved.

Description

Technical Field

[0001] The present invention relates to the fields of power electronics and inverter technology, in particular to a power cycle test bench suitable for testing a vibration table power amplifier. Background Art

[0002] Electrodynamic shakers are commonly used in high-power vibration test benches in industries such as aerospace, automotive, and defense. These test benches are designed to expose products, structures, and components to intense vibration environments to simulate actual operating conditions, ensuring that products and systems can withstand the vibrations encountered during operation or under specific conditions. Vibration testing serves a variety of important purposes, including product development and design validation, reliability and durability testing, failure analysis, and troubleshooting.

[0003] High-power vibration test benches typically consist of powerful electrodynamic vibration mechanisms with precise and controllable vibration capabilities. These shakers may have large power capabilities, wide frequency ranges, and advanced control systems to accurately achieve the desired vibration patterns.

[0004] The power amplifier is the electrical energy converter for the electrodynamic vibration mechanism, converting electrical energy from the grid into the kinetic energy required by the vibration table's vibrating components. The energy requirements vary depending on the vibration frequency, and the power requirements of a high-power amplifier can place a significant load on the test lab's small-capacity electrical grid.

[0005] The electrical energy required by the vibration table at different vibration frequencies is all fluctuating AC components. However, the vibration frequency is different from the power grid frequency. The large-scale non-power frequency fluctuating energy will cause power quality problems in the power grid, such as low load power factor, affecting the reliability of the high-power vibration table amplifier test platform.

[0006] The performance of the power amplifier is related to the design of the vibration outer loop controller of the vibration table system and the response characteristics of the mechanical part of the vibration table. However, during the power amplifier design stage, researchers face problems such as difficulty in obtaining actual vibration table samples, and are unable to accurately evaluate the operating performance of the power amplifier in the corresponding vibration table system. Summary of the Invention

[0007] In view of this, the object of the present invention is to provide a power cycle test bench suitable for testing a vibration table power amplifier, which can meet the high load requirements of electric energy and improve the efficiency of equipment use.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The power cycle test bench provided by the present invention is suitable for testing a vibration table power amplifier, comprising a vibration table power amplifier device powered by a three-phase AC power grid for emitting energy, a power cycle converter device for providing a power cycle function of the vibration table, and a supercapacitor energy storage device for providing energy buffering capability;

[0010] One end of the vibration table power amplifier device powered by the three-phase AC power grid is connected to the three-phase power grid, and the other end is connected to the power cycle converter device. The power cycle converter device is connected to the supercapacitor energy storage device, and the other end of the power cycle converter device is connected to the three-phase power grid.

[0011] Furthermore, the vibration table power amplifier device for testing three-phase AC power grid power supply includes a three-phase AC / DC rectifier bridge, a single-phase DC / AC inverter bridge, and an LCL filter circuit; the input end of the three-phase AC / DC rectifier bridge is connected to the three-phase power grid, and the output end is connected to the input end of the single-phase DC / AC inverter bridge, and the output end of the single-phase DC / AC inverter bridge is connected to the LCL filter circuit; a capacitor is connected in parallel between the three-phase AC / DC rectifier bridge and the single-phase DC / AC inverter bridge.

[0012] Furthermore, the power cycle converter device includes a single-phase AC / DC rectifier bridge, a capacitor C1, a three-phase DC / AC inverter bridge, and an isolation transformer; the input end of the single-phase AC / DC rectifier bridge is connected to the output end of the LCL filter circuit; the output end of the single-phase AC / DC rectifier bridge is connected to the input end of the three-phase DC / AC inverter bridge, and a capacitor C1 is connected in parallel between the single-phase AC / DC rectifier bridge and the three-phase DC / AC inverter bridge; the output end of the three-phase DC / AC inverter bridge is connected to the isolation transformer, and the isolation transformer is connected to the three-phase power grid.

[0013] Furthermore, the supercapacitor energy storage device includes a DC / DC converter and a supercapacitor C2; the DC / DC converter and the supercapacitor C2 are connected in parallel.

[0014] Furthermore, the output side of the single-phase DC / AC inverter bridge can operate in current source mode, voltage source mode and power source mode, and has the control mode switching capability.

[0015] Furthermore, the control system of the single-phase AC / DC rectifier bridge can control the voltage signal output to the capacitor C1 according to the voltage sampling signal detected on the LCL filter circuit, and make the voltage signal and the simulated vibration table coil electromotive force signal consistent in the frequency band below 3000 Hz.

[0016] Furthermore, the control system of the inverter bridge can sample the voltage signal of the DC bus capacitor C1, adjust the output power, and maintain the DC bus voltage stable.

[0017] Furthermore, the DC / DC converter adjusts the supercapacitor energy storage by controlling the voltage amplitude of the supercapacitor C2, sampling the AC component in the voltage signal of the capacitor C1 and calculating the change in the energy storage of the capacitor C1, and transferring the capacitor energy storage exceeding the storage capacity of the capacitor C1 to the supercapacitor energy storage C2.

[0018] Furthermore, the capacitor C1 is a DC bus capacitor.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a power cycle test bench suitable for testing a vibration table power amplifier, which relates to the fields of power electronics and inverters and includes: a vibration table power amplifier device for testing a three-phase AC power grid, the device having the function of emitting energy, and a three-phase AC / DC rectifier bridge arranged on the right side of the three-phase grid, the right side of the rectifier bridge being connected to a single-phase DC / AC inverter bridge, the right side of the single-phase inverter bridge being connected to an LCL filter circuit; a power cycle converter device having a vibration table power cycle function, the device including a single-phase AC / DC rectifier bridge, the right side of the single-phase rectifier bridge being connected to a capacitor C1, the capacitor C1 being connected in parallel to a three-phase DC / AC inverter bridge, the right side of the DC / AC inverter bridge being connected to an isolation transformer, the isolation transformer being connected to the three-phase grid; and a supercapacitor energy storage device having energy buffering capability, the device including a DC / DC converter, the DC / DC converter being connected in parallel to a supercapacitor C2. This test bench suitable for power cycle testing of vibration table power amplifiers achieves the purpose of improving the utilization efficiency of the equipment.

[0021] The present invention provides a test bench that, by providing a vibration table power amplifier device powered by a three-phase AC grid, addresses the challenges of obtaining actual vibration table samples and connecting and testing the vibration table's mechanical components under conventional laboratory conditions. This platform achieves the goal of simulating the mechanical properties of a vibration table under conventional laboratory conditions to complete a power amplifier test platform.

[0022] By incorporating a power cycle converter, this test bench addresses grid power quality issues such as low load power factor caused by large non-power frequency fluctuations in the shaker at different vibration frequencies under conventional laboratory conditions. This improves the reliability of the high-power shaker amplifier test platform.

[0023] This test bench, equipped with a supercapacitor energy storage device, solves the problem of high-power amplifiers, which, under conventional laboratory conditions, can place significant load pressure on the test lab's small-capacity power grid when faced with power demands of varying vibration frequencies. This achieves the goal of simultaneously reducing the burden on the power grid while simultaneously performing tests requiring high power loads.

[0024] The invention overcomes the shortcomings of the existing vibration table power amplifier test platform, such as high power load requirements, poor load power quality, and difficulty in connecting and testing the mechanical parts of the vibration table.

[0025] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0027] Figure 1 The schematic diagram of the power cycle test bench suitable for testing power amplifiers on a vibration table is shown in FIG.

[0028] Figure 2 Schematic diagram of the structure of the vibration table power amplifier device for testing three-phase AC power grid;

[0029] Figure 3 It is a structural schematic diagram of a power cycle converter device;

[0030] Figure 4 Schematic diagram of the structure of a supercapacitor energy storage device;

[0031] Figure: 1. Power amplifier device for testing a vibration table powered by a three-phase AC power grid; 2. Power cycle converter device; 3. Supercapacitor energy storage device; 101. Three-phase power grid; 102. Three-phase AC / DC rectifier bridge; 103. Single-phase DC / AC inverter bridge; 104. LCL filter circuit; 201. Single-phase AC / DC rectifier bridge; 202. Energy storage capacitor C1; 203. Three-phase DC / AC inverter bridge; 204. Isolation transformer; 301. DC / DC converter; 302. Supercapacitor C2. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0033] Example 1

[0034] like Figure 1-Figure 4 As shown, the power cycling test bench provided in this embodiment is suitable for testing a power amplifier on a vibration table, and specifically includes:

[0035] Testing a vibration table power amplifier device 1 powered by a three-phase AC grid. The device 1 has the function of emitting energy and includes a three-phase grid 101, a three-phase AC / DC rectifier bridge 102 arranged on the right side of the three-phase grid, a single-phase DC / AC inverter bridge 103 connected to the right side of the rectifier bridge, and an LCL filter circuit 104 connected to the right side of the single-phase inverter bridge.

[0036] A power cycle converter device 2, which has a vibration table power cycle function, includes a single-phase AC / DC rectifier bridge 201, a capacitor C1 202 connected to the right side of the single-phase rectifier bridge, a three-phase DC / AC inverter bridge 203 connected in parallel to the capacitor C1, and an isolation transformer 204 connected to the right side of the three-phase DC / AC inverter bridge;

[0037] The supercapacitor energy storage device 3 has energy buffering capability and comprises a DC / DC converter 301 , wherein the DC / DC converter is connected in parallel with a supercapacitor C2 302 .

[0038] Three-phase grid 101 generates alternating current with a consistent frequency and a phase shift of 120°. It is connected to a three-phase AC / DC rectifier bridge 102 and an isolation transformer 204. This serves as both the energy source and energy sink for the test bench. Before using the test bench, the three-phase grid is connected to the three-phase rectifier bridge 102 and the isolation transformer 204. After the experiment begins, the three-phase grid provides input to the three-phase rectifier bridge and receives output from the isolation transformer.

[0039] The three-phase rectifier bridge 102 is used for AC / DC rectification of the circuit. The left side of the three-phase AC / DC rectifier bridge is connected to the three-phase power grid 101 , and the right side output is connected to the single-phase DC / AC inverter bridge 103 .

[0040] The single-phase DC / AC inverter bridge 103 is used for direct-to-alternating current inversion. The input side of the single-phase DC / AC inverter bridge is connected to the three-phase AC / DC rectifier bridge 102 , and the output side is connected to the LCL filter circuit 104 .

[0041] In the experimental platform, the three-phase rectifier bridge 102 and its connected single-phase DC / AC inverter bridge 103 are used together to simulate the back-electromotive force characteristics and power amplifier characteristics of a vibration platform in a real environment. When using the experimental platform, the three-phase grid 101 serves as the energy source. The three-phase AC / DC rectifier bridge 102 converts the AC wave from the three-phase grid 101 into DC. The single-phase DC / AC inverter bridge 103 converts the DC from the three-phase AC / DC rectifier bridge 102 into a single-phase AC wave to simulate the back-electromotive force characteristics of the vibration platform and the voltage amplification characteristics of the power amplifier.

[0042] The LCL filter circuit 104 is used for circuit output filtering, with its input side connected to a single-phase DC / AC inverter bridge, and its output side connected to a single-phase AC / DC rectifier bridge (201) of the power circulation device 2.

[0043] like Figure 2 As shown, the three-phase grid 101, three-phase AC / DC rectifier bridge 102, single-phase DC / AC inverter bridge 103, and LCL filter circuit 104 constitute a power amplifier device for testing a vibration platform powered by a three-phase AC grid. Energy generated by the three-phase grid 101 is converted into a DC signal by the three-phase AC / DC rectifier bridge, and then converted into a single-phase AC signal by the single-phase DC / AC inverter bridge. This signal is filtered by the LCL filter circuit to remove high-frequency noise, and then output as an AC wave, which is used to simulate the back-electromotive force characteristics of an actual vibration platform in the circuit.

[0044] The single-phase AC / DC rectifier bridge 201 is used for AC / DC conversion. The input side of the single-phase AC / DC rectifier bridge 201 is connected to the LCL filter circuit, and the output side is connected to the energy storage capacitor C1 202.

[0045] The single-phase AC / DC rectifier bridge is characterized in that its control system can control the voltage signal on the output capacitor C1 according to the current sampling signal detected on the LCL filter circuit, and make this voltage signal consistent with the simulated vibration table coil electromotive force signal in the frequency band below 3000 Hz.

[0046] The energy storage capacitor C1 202 is used for circuit energy storage. The input side of the energy storage capacitor is connected to the single-phase AC / DC rectifier bridge 201 , and the output side is connected to the three-phase DC / AC inverter bridge 203 .

[0047] The three-phase DC / AC inverter bridge 203 is used for direct-to-alternating current conversion. The input side of the three-phase DC / AC inverter bridge is connected to the energy storage capacitor C1 202 , and the output side is connected to the isolation transformer 204 .

[0048] The isolation transformer 204 is used for electrical isolation of the circuit. The input side of the isolation transformer 204 is connected to the three-phase DC / AC inverter bridge 203 , and the output side is connected to the three-phase power grid 101 .

[0049] like Figure 3As shown, the single-phase AC / DC rectifier bridge 201, energy storage capacitor C1 202, three-phase DC / AC inverter bridge 203 and isolation transformer 204 together constitute a power circulation device. The three-phase power grid 101 emits energy, and the vibration table power amplifier device 1 powered by the three-phase AC power grid under test outputs a single-phase AC wave. After passing through the power circulation device 2, the output three-phase AC wave is absorbed by the three-phase power grid 101. The power circulation device is used to improve the power quality problems of the power grid, such as the low power factor of the load caused by the large-scale non-power frequency fluctuation energy of the vibration table at different vibration frequencies under conventional laboratory conditions. The purpose of improving the reliability of the high-power vibration table power amplifier test platform is achieved.

[0050] The DC / DC converter 301 is used for circuit energy storage switching and voltage amplitude modulation. The input side of the DC / DC converter is connected to the energy storage capacitor C1 202, and the output side is connected to the super capacitor C2 302.

[0051] The supercapacitor C2 302 is used to store electrical energy that exceeds the storage capacity of the DC bus capacitor C1 (202).

[0052] like Figure 4 As shown, the DC / DC converter 301 and supercapacitor C2 302 form a supercapacitor energy storage device. The DC / DC converter regulates electrical energy that exceeds the storage capacity of bus capacitor C1 and sends it to supercapacitor C2 for buffering, avoiding the problem of excessive power requirements of small-capacity power grids placing heavy load pressure on the power grid. This achieves the goal of achieving bench testing with high power load requirements while reducing the burden on the power grid.

[0053] Working Principle: Before using the experimental platform, connect the three-phase power grid 101 to the isolation transformer 204 and the three-phase AC / DC rectifier bridge 102. When using the experimental platform, the three-phase power grid 101 for testing the vibration table power amplifier device powered by the three-phase AC power grid outputs three-phase AC power with a consistent frequency and a phase difference of 120°. The three-phase AC / DC rectifier bridge 102 converts the three-phase AC power emitted by the three-phase power grid 101 into DC power. The single-phase DC / AC inverter bridge 103 converts the DC power into single-phase AC power. After the LCL filter circuit 104 filters out high-frequency noise, the output AC waveform is used to simulate the back electromotive force characteristics of the vibration table in the circuit. Testing the vibration table power amplifier device powered by the three-phase AC power grid is used to solve the problems of being unable to obtain vibration table samples and the difficulty of connecting and testing the mechanical parts of the vibration table. The purpose of simulating the mechanical properties of the vibration table to complete the test platform for the power amplifier is achieved.

[0054] The AC wave output by the LCL filter circuit serves as the energy source for the power circulation device. This AC wave is converted into a DC bus voltage by the single-phase AC / DC rectifier bridge 201. The bus energy storage capacitor C1 202 is used for circuit energy storage. The three-phase DC / AC inverter bridge 203 converts the DC bus voltage into a three-phase AC signal, which is transmitted back to the three-phase power grid 101 via the isolation transformer 204. That is, the three-phase power grid 101 emits energy and receives energy output by the isolation transformer 204. The power circulation of the experimental bench is used to solve the problem of power quality of the power grid where the load power factor is too low due to large-scale non-industrial frequency fluctuation energy. The purpose of improving the reliability of the high-power vibration table amplifier test platform is achieved.

[0055] When the bus voltage exceeds the storage capacity of bus capacitor C1 202 due to excessive power, DC / DC converter 301 is activated, transferring the excess power beyond the storage capacity of bus capacitor C1 202 to supercapacitor C2 302 for storage. The supercapacitor storage device on the test bench avoids placing significant load on the small-capacity power grid in the test lab, achieving the goal of enabling tests with high power load requirements while reducing the burden on the power grid.

[0056] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical developers in this field and related fields without making creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods specifically described and explained in the present invention are implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A power cycling test bench suitable for testing power amplifiers on a vibration table, characterized by: The invention comprises a vibration table power amplifier device (1) for emitting energy and powered by a three-phase AC power grid, a power circulation converter device (2) for providing a power circulation function of the vibration table, and a supercapacitor energy storage device (3) for providing energy buffering capability; One end of the vibration table power amplifier device (1) powered by the three-phase AC power grid is connected to the three-phase power grid, and the other end is connected to the power cycle converter device (2), the power cycle converter device (2) is connected to the supercapacitor energy storage device (3), and the other end of the power cycle converter device (2) is connected to the three-phase power grid; The vibration table power amplifier device (1) for testing three-phase AC power grid power supply comprises a three-phase AC / DC rectifier bridge (102), a single-phase DC / AC inverter bridge (103), and an LCL filter circuit (104); the input end of the three-phase AC / DC rectifier bridge (102) is connected to the three-phase power grid (101), the output end is connected to the input end of the single-phase DC / AC inverter bridge (103), and the output end of the single-phase DC / AC inverter bridge (103) is connected to the LCL filter circuit (104); a capacitor is connected in parallel between the three-phase AC / DC rectifier bridge (102) and the single-phase DC / AC inverter bridge (103); The three-phase power grid (101) serves as an energy source, the three-phase AC / DC rectifier bridge (102) converts the AC wave of the three-phase power grid (101) into DC, and the single-phase DC / AC inverter bridge (103) converts the DC of the three-phase AC / DC rectifier bridge (102) into a single-phase AC wave to simulate the back electromotive force characteristics of the vibration table and the voltage amplification characteristics of the power amplifier; The power cycle converter device (2) comprises a single-phase AC / DC rectifier bridge (201), a capacitor C1 (202), a three-phase DC / AC inverter bridge (203), and an isolation transformer (204); the input end of the single-phase AC / DC rectifier bridge (201) is connected to the output end of the LCL filter circuit (104); the output end of the single-phase AC / DC rectifier bridge (201) is connected to the input end of the three-phase DC / AC inverter bridge (203), and the capacitor C1 (202) is connected in parallel between the single-phase AC / DC rectifier bridge (201) and the three-phase DC / AC inverter bridge (203); the output end of the three-phase DC / AC inverter bridge (203) is connected to the isolation transformer (204), and the isolation transformer (204) is connected to the three-phase power grid (101).

2. The power cycling test bench for testing a vibration table power amplifier according to claim 1, characterized in that: The supercapacitor energy storage device (3) comprises a DC / DC converter (301) and a supercapacitor C2 (302); the DC / DC converter (301) and the supercapacitor C2 (302) are connected in parallel.

3. The power cycling test bench for testing a vibration table power amplifier according to claim 1, wherein: The output side of the single-phase DC / AC inverter bridge (103) can operate in a current source mode, a voltage source mode, and a power source mode, and has a control mode switching capability.

4. The power cycling test bench for testing a vibration table power amplifier according to claim 1, wherein: The control system of the single-phase AC / DC rectifier bridge (201) can control the voltage signal output to the capacitor C1 (202) according to the voltage sampling signal detected on the LCL filter circuit (104), and make the voltage signal and the simulated vibration table coil electromotive force signal consistent in the frequency band below 3000 Hz.

5. The power cycling test bench for testing a vibration table power amplifier according to claim 1, characterized in that: The control system of the three-phase DC / AC inverter bridge (203) can sample the voltage signal of the capacitor C1 (202), adjust the output power, and maintain the stability of the DC bus voltage.

6. The power cycling test bench for testing a vibration table power amplifier according to claim 2, wherein: The DC / DC converter (301) adjusts the supercapacitor energy storage by controlling the voltage amplitude of the supercapacitor C2 (302), samples the AC component in the voltage signal of the capacitor C1 (202), calculates the change in the energy storage of the capacitor C1 (202), and transfers the capacitor energy storage exceeding the storage capacity of the capacitor C1 (202) to the supercapacitor C2 (302) for energy storage.

7. The power cycling test bench for testing a vibration table power amplifier according to claim 1, wherein: The capacitor C1 (202) is a DC bus capacitor.

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