Energy recovery method and system for vibration test power amplifier burn-in test

Abstract

An energy recovery method and system for vibration test power amplifier aging test. The method comprises: inputting alternating current output by a power amplifier to an AC / DC conversion module during the vibration test power amplifier aging test; converting unstable alternating current into stable direct current by a high-frequency PWM rectification technology through the AC / DC conversion module, and adjusting the input impedance by using a control algorithm to form an equivalent impedance required by the power amplifier aging test; receiving the direct current output by the AC / DC conversion module and temporarily storing the electric energy by an energy storage device; and inverting the direct current output by the energy storage device into alternating current by a DC / AC conversion module. The system comprises an AC / DC conversion module, an energy storage device, a DC / AC conversion module and a control unit. The present application can recover and feed back the electric energy output by the vibration test power amplifier aging test to the power grid, significantly reducing energy consumption and heat dissipation load; and by continuously adjusting the input impedance, various load characteristics such as resistance, inductance and capacitance can be simulated.

Description

Technical Field

[0001] This invention relates to the field of power amplifier aging test technology, and in particular to an energy recovery method and system for vibration test power amplifier aging test. Background Technology

[0002] Power amplifiers for vibration testing are core components of vibration testing equipment. They must undergo long-term power-on aging tests before leaving the factory and before entering service to screen for potential problems and ensure operational stability.

[0003] Currently, vibration testing of power amplifiers before they leave the factory mainly relies on two methods: water load and resistive load. Regardless of the method used, a large amount of heat is generated, with daily power consumption exceeding 1000 kWh, which is neither energy-efficient nor environmentally friendly.

[0004] Meanwhile, water loads and resistive loads are mostly fixed impedance modes, which cannot flexibly simulate different load conditions such as resistive, inductive and capacitive loads. They differ greatly from the actual working load characteristics of the vibration test power amplifier and have low fit with the aging test conditions.

[0005] Furthermore, existing power supply aging energy recovery solutions are mostly designed for ordinary switching power supplies and power frequency power supplies, and are not specifically adapted for the wide-bandwidth, nonlinear, and large dynamic output characteristics of vibration test power amplifiers. They lack a complete solution with continuously adjustable impedance simulated load and energy storage buffer combined with multi-mode control, making it difficult to meet the aging test requirements of vibration test power amplifiers for high precision, high energy saving, and high adaptability.

[0006] Therefore, in view of the shortcomings of the existing technology, it is necessary to design an energy recovery method and system for vibration test power amplifier aging test to solve the above problems.

[0007] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solution of the present invention and for the convenience of those skilled in the art to understand it. It should not be assumed that the above content is known to those skilled in the art simply because it has been described in the background of the present invention. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention aims to disclose an energy recovery method and system for aging testing of power amplifiers in vibration tests.

[0009] This invention discloses an energy recovery method for aging tests of power amplifiers during vibration testing, comprising the following steps:

[0010] During the vibration test and power amplifier aging test, the AC power output from the power amplifier is input to the AC / DC conversion module.

[0011] The AC / DC conversion module relies on high-frequency PWM rectification technology to track the dynamic changes of the power amplifier's output voltage and current in real time, and synchronously adjusts its own input-side equivalent impedance to adapt to aging test conditions; and rectifies and transforms the irregular waveform and fluctuating parameters of AC power into DC power with stable amplitude.

[0012] The energy storage device receives and stores the DC power output from the AC / DC conversion module.

[0013] Preferred technical solution: The DC power stored in the energy storage device is converted into AC power that meets the national grid access standards through a DC / AC conversion module, and the inverted AC power is fed back to the national grid.

[0014] Preferred technical solution: Equivalent impedance regulation is achieved by adjusting the input current of the AC / DC conversion module through a current closed-loop control algorithm, including the following steps:

[0015] Real-time acquisition of the input voltage U1 and actual input current I1 on the input side of the AC / DC conversion module, based on the preset target impedance value R of the aging test. 0， The current setpoint I is calculated. ref =U1 / R0;

[0016] With this current given value I ref As the control target, the actual input current I1 is driven to follow the current setpoint I using a high-frequency PWM rectification control method. ref The change causes the equivalent impedance on the input side, R1 = U1 / I1, to approach the preset target impedance value, R0.

[0017] Preferred technical solution: Simulate different load characteristics by adjusting the phase offset of the actual input current relative to the input voltage; when the actual input current is in phase with the input voltage, it is equivalent to a resistive load; when the actual input current lags behind the input voltage, it is equivalent to an inductive load; when the actual input current leads the input voltage, it is equivalent to a capacitive load.

[0018] Preferred technical solution: Use any one of the following working modes on the DC output side of the AC / DC conversion module: constant current charging, constant voltage charging, or constant power charging, to implement charging control for the energy storage device.

[0019] The present invention also provides an energy recovery system for aging tests of power amplifiers in vibration tests, for performing any of the preceding energy recovery methods, comprising:

[0020] The AC / DC conversion module has its input side connected to a power amplifier to convert the input AC power into DC power and adjust its own input impedance to form an equivalent impedance.

[0021] An energy storage device, connected to the output side of the AC / DC conversion module, is used to receive DC power and temporarily store electrical energy.

[0022] DC / AC conversion module, connected to energy storage device, is used to invert the DC power output by energy storage device into AC power.

[0023] The control unit is bidirectionally fed back to the AC / DC conversion module and regulates the AC / DC conversion module through a control algorithm.

[0024] Preferred technical solution: The input impedance of the AC / DC conversion module can be continuously and steplessly adjusted within the range of 0.5Ω to 10Ω.

[0025] Preferred technical solution: The energy storage device is a lithium battery pack, which is used to store the absorbed electrical energy in the form of chemical energy.

[0026] Due to the application of the above technical solutions, the beneficial effects of this invention compared with the prior art are as follows:

[0027] This invention abandons the traditional energy-consuming heat dissipation mode of resistive loads. Instead, it rectifies and stores excess electrical energy from power amplifier aging tests, ultimately inverting and feeding it back to the grid, significantly reducing test energy consumption and minimizing on-site heat emissions. Utilizing high-frequency PWM rectification technology, it tracks the output voltage and current fluctuations of the power amplifier in real time. By adjusting the input current amplitude, it achieves equivalent impedance regulation. Combined with current and voltage phase adjustment, it can simulate various load types, including resistive, inductive, and capacitive loads. The impedance can be continuously and steplessly adjusted within the range of 0.5Ω to 10Ω, making it suitable for aging tests of different models of vibration-tested power amplifiers, demonstrating strong versatility. Furthermore, relying on high-frequency PWM rectification technology, it can track the output voltage and current fluctuations of the power amplifier in real time, effectively handling AC power with irregular waveforms and large parameter fluctuations, and stabilizing the output DC power. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a flowchart of the energy recovery method for aging test of a power amplifier under vibration testing according to the present invention;

[0030] Figure 2 This is a schematic diagram of the energy recovery system for vibration test power amplifier aging test according to the present invention.

[0031] In the attached diagram above, 1 is a power amplifier; 2 is an AC / DC conversion module; 3 is an energy storage device; 4 is a DC / AC conversion module; 5 is a control unit; and 6 is the State Grid Corporation of China. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the description of embodiments of this application herein. Furthermore, the terms "comprising" and "having," and their synonyms, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0035] Furthermore, some of the aforementioned terms, besides indicating direction or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0036] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," "fitting," and "fitting" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Similarly, "fitting" can mean completely or partially fitted. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example:

[0039] like Figure 1 As shown, the present invention discloses an energy recovery method for aging tests of power amplifiers used in vibration tests, comprising the following steps:

[0040] S1. During the vibration test and power amplifier aging test, the wideband, nonlinear, and large dynamic irregular AC output of the power amplifier is connected to the input side of the AC / DC conversion module.

[0041] The S2.AC / DC conversion module relies on high-frequency PWM rectification technology to track the dynamic changes of the power amplifier's output voltage and current in real time, and synchronously adjusts its own input-side equivalent impedance to adapt to aging test conditions. It also rectifies and transforms the irregular waveform and fluctuating parameters of AC power into DC power with stable amplitude. In this embodiment, the impedance adjustment range is set to be continuously adjustable from 0.5Ω to 10Ω, and it can simulate resistive, inductive, or capacitive load characteristics according to test requirements to accurately match actual working conditions.

[0042] The stable DC power output from the S3 AC / DC conversion module is delivered to the energy storage device, which uses a lithium battery pack to temporarily store and buffer electrical energy in the form of chemical energy, smoothing power fluctuations and suppressing current surges. The control unit, in conjunction with the AC / DC conversion module, selects any of the constant current, constant voltage, or constant power modes to perform orderly charging control of the lithium battery pack, avoiding overcharging, surge current, and voltage fluctuations, and ensuring the safety and stability of the energy storage process. Specifically, the AC / DC conversion module dynamically adjusts its output parameters according to the charging curve of the lithium battery pack. During the charging phase of the lithium battery pack, it uses a constant current mode for rapid energy replenishment. When the lithium battery pack is close to full charge, it switches to a constant voltage mode to avoid overcharging, ensuring the safety and efficiency of the energy storage process. The constant power mode can match the rated output of the power amplifier to ensure the load stability of the aging test.

[0043] S4. The DC power stored in the energy storage device is output to the DC / AC conversion module. The DC / AC conversion module inverts the DC power into AC power that conforms to the national power grid standard (three-phase 380V / 50Hz, total harmonic distortion ≤3%). The inverted power can be directly supplied to other equipment on site or fed back to the public power grid without pollution, completing the closed-loop energy recovery and reuse. Specifically, when the energy storage device reaches a preset power threshold, it outputs the stored DC power to the DC / AC conversion module.

[0044] Specifically, under resistive load conditions, the AC / DC conversion module employs a current closed-loop control algorithm to achieve precise adjustment of the equivalent impedance: the control unit acquires the input voltage U1 and actual input current I1 on the input side of the AC / DC conversion module in real time, and calculates the current setpoint I according to the target impedance value R0 preset for the aging test and the impedance matching relationship. ref =U1 / R0; then I ref To achieve the control objective, a high-frequency PWM rectification and control method is used to ensure that the actual input current I1 stably tracks the given value I. ref Ultimately, the equivalent impedance on the input side is made to satisfy R1=U1 / I1≈R0, thereby achieving high precision and continuous adjustment within the range of 0.5Ω to 10Ω.

[0045] Meanwhile, the control algorithm simulates different load characteristics by adjusting the phase offset of the actual input current relative to the input voltage; when the actual input current is in phase with the input voltage, it is equivalent to a resistive load; when the actual input current lags behind the input voltage, it is equivalent to an inductive load; and when the actual input current leads the input voltage, it is equivalent to a capacitive load. This can fully match the complex load characteristics of the power amplifier under actual operating conditions in vibration tests.

[0046] like Figure 1 and Figure 2 As shown, this invention also discloses an energy recovery system for aging tests of power amplifiers used in vibration tests, adapted to the above-mentioned energy recovery method. It mainly consists of an AC / DC conversion module 2, an energy storage device 3, a DC / AC conversion module 4, and a control unit 5. The AC / DC conversion module 2 is connected to the external vibration test power amplifier 1 at its input side, employing high-frequency PWM rectification technology to convert fluctuating AC power into stable DC power. It also features continuously adjustable input impedance and multi-type load simulation functions, constructing a high-precision equivalent impedance for aging tests. The energy storage device 3 is connected to the output side of the AC / DC conversion module 2, receiving the rectified stable DC power and temporarily... The DC / AC conversion module 4 is connected to the back end of the energy storage device 3, converting the stored DC power back into standard AC power. The output side of the DC / AC conversion module 4 is connected to the national power grid 6, realizing pollution-free grid-connected feedback of electrical energy. The control unit 5 establishes a bidirectional feedback connection with the AC / DC conversion module 2, and collects operating parameters such as voltage, current, impedance, and power in real time. Through the control algorithm, it issues control commands to realize closed-loop adjustment of the input impedance of the DC / AC conversion module 4, simulation of load characteristics, and multi-mode charging control of energy storage, ensuring the system's stable adaptation to aging tests of power amplifiers of different power levels.

[0047] This invention discloses an energy recovery system for aging tests of power amplifiers during vibration testing. During operation, the fluctuating AC output of the power amplifier is directly connected to an AC / DC conversion module. The control unit, in conjunction with high-frequency PWM rectification technology, collects the voltage and current parameters at the amplifier's output in real time. Firstly, through current closed-loop control logic, combined with a preset target impedance, the corresponding current setpoint is calculated to precisely adjust the actual current on the module's input side, achieving equivalent resistance adjustment. Simultaneously, by adjusting the phase offset between current and voltage, various load conditions (resistive, inductive, and capacitive) are flexibly simulated to closely match the actual operating environment of the power amplifier. After achieving equivalent load matching... Meanwhile, the AC / DC conversion module utilizes high-frequency PWM rectification to normalize the distorted and fluctuating AC power output from the power amplifier and convert it into stable DC power. The front-end load regulation and the back-end DC voltage regulation are compatible and do not interfere with each other. The rectified stable DC power is delivered to the energy storage device composed of lithium battery packs for storage, realizing the recovery of excess energy during aging tests. Subsequently, the DC power in the energy storage device can be inverted into standard industrial frequency AC power through the DC / AC conversion module and directly fed back into the public power grid to realize the secondary utilization of electrical energy. At the same time, constant current, constant voltage, and constant power charging modes can be flexibly selected according to the actual state of the energy storage device to ensure the safe and stable charging process of the energy storage device.

[0048] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy recovery method for aging tests of power amplifiers during vibration testing, characterized in that, Includes the following steps: During the vibration test and power amplifier aging test, the AC power output from the power amplifier is input to the AC / DC conversion module. The AC / DC conversion module relies on high-frequency PWM rectification technology to track the dynamic changes of the output voltage and current of the power amplifier in real time, and synchronously adjusts its own input-side equivalent impedance to adapt to the aging test conditions. It also rectifies and transforms irregular-wavelength, parameter-fluctuating alternating current into stable-amplitude direct current. The AC / DC converter receives and stores the DC power output by the AC / DC converter through an energy storage device.

2. The energy recovery method according to claim 1, characterized in that: The DC power stored in the energy storage device is converted into AC power that meets the national grid access standards through a DC / AC conversion module, and then the converted AC power is fed back to the national grid.

3. The energy recovery method according to claim 1, characterized in that: The equivalent impedance regulation is achieved by adjusting the input current of the AC / DC conversion module through a current closed-loop control algorithm, including the following steps: Real-time acquisition of the input voltage U1 and actual input current I1 on the input side of the AC / DC conversion module, based on the preset target impedance value R of the aging test. 0， The current setpoint I is calculated. ref =U1 / R0; With this current given value I ref As the control target, the actual input current I1 is driven to follow the current setpoint I using a high-frequency PWM rectification control method. ref The change causes the equivalent impedance on the input side, R1 = U1 / I1, to approach the preset target impedance value, R0.

4. The energy recovery method according to claim 3, characterized in that: Different load characteristics are simulated by adjusting the phase offset of the actual input current relative to the input voltage; when the actual input current is in phase with the input voltage, it is equivalent to a resistive load; when the actual input current lags behind the input voltage, it is equivalent to an inductive load; and when the actual input current leads the input voltage, it is equivalent to a capacitive load.

5. The energy recovery method according to claim 1, characterized in that: The energy storage device is charged by using any one of the following operating modes on the DC output side of the AC / DC conversion module: constant current charging, constant voltage charging, or constant power charging.

6. An energy recovery system for aging tests of power amplifiers under vibration, used to perform the energy recovery method according to any one of claims 1 to 5, characterized in that, include: The AC / DC conversion module has its input side connected to a power amplifier to convert the input AC power into DC power and adjust its own input impedance to form an equivalent impedance. An energy storage device is connected to the output side of the AC / DC conversion module to receive the DC power and temporarily store the electrical energy. A DC / AC conversion module is connected to the energy storage device and is used to invert the DC power output by the energy storage device into AC power. The control unit is bidirectionally fed back to the AC / DC conversion module and regulates the AC / DC conversion module through a control algorithm.

7. The energy recovery system for aging testing of a power amplifier under vibration testing according to claim 6, characterized in that: The input impedance of the AC / DC conversion module can be continuously and steplessly adjusted within the range of 0.5Ω to 10Ω.

8. The energy recovery system for aging testing of a power amplifier under vibration testing according to claim 6, characterized in that: The energy storage device is a lithium battery pack, used to store absorbed electrical energy in the form of chemical energy.

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