Higher harmonic generation equipment capable of testing harmonic resistance of product

Abstract

The utility model relates to the technical field of higher harmonics, and discloses higher harmonic generation equipment capable of testing the harmonic resistance of a product, which comprises a switching power supply circuit module, an operational amplifier circuit module, a signal generator module, an industrial frequency transformer module and an isolation transformer module, according to the utility model, the anti-harmonic capability of the product can be tested before the product is put into the market, so that the product can still be used safely and reliably in a harsh use environment; a traditional harmonic generator is usually a pure waveform generation circuit, and a waveform with a certain shape and frequency is output through circuit construction. After the circuit is fixed, the generated waveform and frequency are always fixed, however, the utility model has the advantages that the output harmonic waveform is diversified, the output frequency is adjustable, and the maximum bandwidth can reach 100kHZ.

Description

Technical Field

[0001] This utility model relates to the field of high-order harmonic technology, and more specifically to a high-order harmonic generating device that can test a product's ability to resist harmonics. Background Technology

[0002] With the rise of new energy sources, various high-frequency synthesized AC power sources (such as photovoltaic, wind power, and energy storage) are being connected to the power grid, making the power supply composition of the grid increasingly complex. At the same time, the rapid growth of new energy vehicles has led to a large number of charging devices being connected to the grid. These devices are becoming increasingly concentrated, and their potential pollution to the power grid is becoming more and more serious. When the high-frequency harmonic voltage in a local power grid reaches a certain amplitude proportion, it can threaten electrical equipment connected to the same network, potentially causing malfunctions or even damage.

[0003] Although national and international standards clearly stipulate the harmonic current standards injected into the power grid when various electrical appliances are working, the domestic product quality supervision system is still imperfect, and some countries and regions have not paid enough attention to this issue. As a result, some unscrupulous manufacturers omit the input filter of the product or cut corners in the production process in order to reduce costs, causing the harmonic index of the product to far exceed the relevant limit standards.

[0004] Therefore, a voltage source device that can generate high-order harmonics to mimic a polluted power grid in reality is urgently needed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-order harmonic generation device that can test the harmonic resistance capability of a product, so as to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: a high-order harmonic generation device that can test the harmonic resistance capability of a product, including a switching power supply circuit module, an operational amplifier circuit module, a signal generator module, a power frequency transformer module, and an isolation transformer module.

[0007] Preferably, the switching power supply circuit module uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V.

[0008] Preferably, the operational amplifier circuit module can amplify the amplitude of the signal generator. The operational amplifier circuit increases the voltage by a factor, and its amplitude is determined by the voltage withstand capability of the operational amplifier chip. The maximum frequency is also determined by the capability of the operational amplifier chip. The output waveform and frequency are provided by the signal amplifier, and the operational amplifier circuit does not change the output waveform and frequency.

[0009] Preferably, in the signal generator module, the external device signal generator is responsible for providing the original signal to the operational amplifier circuit, providing various frequencies and waveforms.

[0010] Preferably, the isolation transformer module transmits the high-frequency waveform generated by the operational amplifier circuit to the mains power. The high-frequency signal is coupled to the secondary side of the isolation transformer through the isolation transformer. The secondary side and the mains power isolated by the power frequency transformer are superimposed together to serve as a voltage source to provide power to the product under test.

[0011] Preferably, the power frequency transformer module is used to input mains power through the power frequency transformer, and then output it to the load after isolation, and transmit the high-frequency signal generated by the generator circuit after the isolated output.

[0012] Preferably, if distinguished by circuit, it can be divided into three parts: switching power supply section, amplifier circuit section, and isolation transformer circuit section.

[0013] Preferably, the switching power supply section uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V, which are used to provide a voltage source.

[0014] Preferably, the amplification circuit uses an operational amplifier circuit to amplify the voltage amplitude. The amplification factor can be determined by the amplification circuit, and the initial amplitude and frequency are provided by the signal amplifier of an external device.

[0015] Preferably, the isolation transformer circuit section converts the high-frequency waveform generated by the operational amplifier circuit into the mains frequency component through the isolation transformer.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] This invention facilitates the testing of a product's harmonic rejection capability before it enters the market, ensuring safe and reliable operation even in harsh environments. Traditional harmonic generators are often simple waveform generation circuits that output waveforms of a specific shape and frequency. Once the circuit is fixed, the generated waveform and frequency are often fixed. However, this invention offers the advantages of diverse output harmonic waveforms and adjustable output frequency, with a maximum bandwidth reaching 100kHz. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the design scheme of this utility model.

[0019] Figure 2 This is a schematic diagram of the switching power supply section.

[0020] Figure 3 This is a schematic diagram of the amplifier circuit.

[0021] Figure 4 This is a schematic diagram of the isolation transformer circuit.

[0022] Figure 5 This is a schematic diagram of normal power frequency AC.

[0023] Figure 6 This is a schematic diagram of the high-order harmonics generated by the operational amplifier.

[0024] Figure 7 This is a schematic diagram of introducing higher harmonics into the power frequency. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The high-order harmonic generating device that can test the harmonic resistance capability of a product involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1-7 As shown, this utility model provides a high-order harmonic generation device that can test the harmonic resistance capability of a product, including a switching power supply circuit module, an operational amplifier circuit module, a signal generator module, a power frequency transformer module, and an isolation transformer module.

[0027] In this embodiment, it should be specifically noted that the switching power supply circuit module uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V. These are used to provide voltage sources for the operational amplifier circuit. The flyback topology features simple structure, low cost, wide input voltage range, and stable multi-output characteristics.

[0028] In this embodiment, it should be specifically noted that the operational amplifier circuit module amplifies the amplitude of the signal generator. The signal emitted by the signal generator is typically ±20V, and the operational amplifier circuit can amplify this voltage by a factor of two. The amplitude is determined by the voltage withstand capability of the operational amplifier chip, and the maximum frequency is also determined by the capability of the operational amplifier chip. The output waveform and frequency are provided by the signal amplifier; the operational amplifier circuit does not change the output waveform and frequency. The external device signal amplifier is also an important component. The signal generator can provide countless waveforms and adjustable frequencies, offering powerful functionality and enhancing the device's output capability.

[0029] In this embodiment, it should be specifically noted that the signal generator module, the external device signal generator is responsible for providing the original signal to the operational amplifier circuit, and is an existing device that can provide various frequencies and waveforms.

[0030] In this embodiment, it is important to specifically explain the isolation transformer module, which is the most critical part. It transmits the high-frequency waveform generated by the operational amplifier circuit to the mains power. To ensure the safety of the operational amplifier circuit, the high-frequency signal is coupled to the secondary side of the isolation transformer. The secondary side and the mains power, isolated by the power frequency transformer, are superimposed to form a voltage source that provides power to the product under test.

[0031] In this embodiment, it should be specifically noted that the power frequency transformer module receives the mains power input, isolates it, and then outputs it to the load. Furthermore, a high-frequency signal generated by the generator circuit is transmitted after the isolated output.

[0032] In this embodiment, it should be specifically noted that, if distinguished by circuit, it can be divided into three parts:

[0033] The first part, the switching power supply section, uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V. These are used to provide the voltage source.

[0034] The second part is the amplifier circuit. This part of the circuit uses an operational amplifier circuit to amplify the voltage amplitude. The amplifier circuit can determine the amplification factor, and the initial amplitude and frequency are provided by the signal amplifier of the external device. The external device signal amplifier is also an important part of this patent.

[0035] The third part, the isolation transformer circuit, converts the high-frequency waveform generated by the operational amplifier circuit into the mains frequency component through the isolation transformer.

[0036] In this embodiment, it should be specifically noted that an external device—a signal generator—is used to obtain the original waveform of the harmonics. The signal generator can produce various types and frequencies of waveforms, thus maximally mimicking various pollution sources in the real power grid. After the signal generator provides the original waveform, the signal is amplified by the amplifier circuits OPA541 and OPA445 to obtain the amplitude required for testing. Here, the operational amplifier circuit can be any brand of operational amplifier IC, as long as it has amplification functionality.

[0037] In this embodiment, it should be specifically noted that the signal is provided by an external signal generator, capable of providing various waveforms with adjustable frequencies. The harmonic amplitude is amplified by an operational amplifier circuit, reaching a maximum of ±40V. Four voltage sources are provided to the operational amplifier circuit via a flyback power supply, separating ±40V and ±12V, thus separating the power supplies for the OPA445 and OPA541, making the operational amplifier section of the patented circuit safer and more reliable. Furthermore, it eliminates the need for four external DC power supplies to power the operational amplifier circuit. Power is supplied to the output via a power frequency isolation transformer, further enhancing safety. The harmonic signal is in series with the LN output through the isolation transformer, ensuring that the output does not affect the operational amplifier circuit.

[0038] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-order harmonic generator for testing a product's resistance to harmonics, characterized in that: The system includes a switching power supply circuit module, an operational amplifier circuit module, a signal generator module, a power frequency transformer module, and an isolation transformer module. The switching power supply circuit module uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V. The operational amplifier circuit module amplifies the amplitude of the signal generator, increasing the voltage by a factor of its magnitude. The amplitude and maximum frequency are determined by the voltage withstand capability of the operational amplifier chip. The output waveform and frequency are provided by the signal amplifier; the operational amplifier circuit does not alter the output waveform and frequency. The signal generator module provides the original signal to the operational amplifier circuit from an external signal generator, offering various frequencies and waveforms. The isolation transformer module transmits the high-frequency waveform generated by the operational amplifier circuit to the mains power supply. The high-frequency signal is coupled to the secondary side of the isolation transformer, where it is superimposed with the mains power supply isolated by the power frequency transformer, serving as a voltage source to power the product under test.

2. The high-order harmonic generator according to claim 1, which can test the harmonic resistance capability of a product, is characterized in that: The power frequency transformer module is used to input mains power, isolate it, and output it to the load. After isolation, the high-frequency signal generated by the generator circuit is transmitted to the output.

3. The high-order harmonic generator according to claim 2, characterized in that: If classified by circuit, it can be divided into three parts: the switching power supply section, the amplifier circuit section, and the isolation transformer circuit section.

4. A high-order harmonic generator for testing a product's resistance to harmonics according to claim 3, characterized in that: The switching power supply section uses a flyback topology to output four voltages: +40V, -40V, +12V, and -12V, which are used to provide voltage sources.

5. A high-order harmonic generator for testing a product's resistance to harmonics according to claim 4, characterized in that: The amplifier circuit section uses an operational amplifier circuit to amplify the voltage amplitude. The amplifier circuit can determine the amplification factor, and the initial amplitude and frequency are provided by the signal amplifier of the external device.

6. A high-order harmonic generator for testing a product's resistance to harmonics according to claim 5, characterized in that: The isolation transformer circuit section converts the high-frequency waveform generated by the operational amplifier circuit into the mains frequency power component through the isolation transformer.

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