Lightning surge generator for micro-pulse interference source

Abstract

The utility model discloses a lightning surge generator for a micro-pulse interference source, and relates to the technical field of lightning surge generators. The circuit comprises a high-voltage generator U, a first pre-charging resistor Rc2, a second pre-charging resistor Rc3, a switch Switch, an inductor Lr2 and a resistor Rm2 which are connected in sequence. The main energy storage capacitor Cc2 is positioned between the first pre-charging resistor Rc2 and the second pre-charging resistor Rc3 and between the high-voltage generator U and one terminal and is connected into the main energy storage capacitor Cc2; the secondary processing capacitor Cc3 is positioned among the second pre-charging resistor Rc3, the switch Switch, the high-voltage generator U and a terminal, and is connected in parallel; a resistor Rs3 is connected in parallel among the switch Switch, the inductor Lr2, the high-voltage generator U and one terminal; according to the scheme, the problem of a micro-pulse standard interference source is better solved, and micro-pulses in the field of lightning surge generators are supplemented.

Description

Technical Field

[0001] The utility model belongs to the technical field of lightning surge generators, and particularly relates to a lightning surge generator for a micro-pulse interference source. Background Technique

[0002] A lightning surge generator is a highly reliable test system specifically designed for the characteristics and requirements of the lightning surge immunity test in electromagnetic compatibility experiments.

[0003] For the existing lightning surge generator of a micro-pulse interference source, it adopts the structure as shown in Figure 1 Figure 1, which includes a high-voltage generator U, a charging resistor Rc1, a switch Switch, a resistor Rm, an inductor Lr, and two terminals connected in sequence, and a parallel combination of a energy storage capacitor Cc1, a resistor RS1, and a resistor RS2; the working principle of this existing technology is as follows: First, the switch is in the open state. At this time, the goal of the circuit is to charge the energy storage capacitor Cc1 to a high voltage. Since the test level of the surge is generally in the kV level, the capacity of the selected energy storage capacitor is very large. Therefore, a charging resistor Rc1 needs to be added to the charging circuit to avoid a huge current generated instantaneously when the high-voltage generator U is turned on, which may damage the high-voltage generator U. After the energy storage capacitor Cc1 is charged with the required voltage and electric quantity, the main circuit switch closes to form a discharge loop. In the initial period when the switch is closed for a period of time, the energy storage capacitor Cc1 charges the resistor Rm, the inductor Lr, and the resistor RS2. At this time, the lightning surge voltage waveform measured at both ends of RS2 is in the rising state of the waveform. During this period, the inductor Lr also plays a role in energy storage in the pulse circuit. As the electric quantity of the energy storage capacitor Cc1 slowly decreases, the inductor Lr and the capacitor Cc1 discharge the resistor RS1, Rm, and RS2 at the same time. At this time, the lightning surge voltage waveform measured at both ends of RS2 starts to decline from the peak value. The resistor Rm ensures that the internal resistance of the entire generator is 2Ω. Finally, the required (1.2 / 50)μs-(8 / 20)μs lightning surge waveform can be obtained.

[0004] The calculation method for the required waveform is the double-exponential function of the current waveform: i(t) = I0k(e -at -e -βt )(Formula 1); in the formula, I0 represents the peak value of the lightning current; i represents the instantaneous value of the lightning current; α represents the wavefront attenuation coefficient; β represents the wave tail attenuation coefficient; k represents the waveform correction coefficient.

[0005] The above-mentioned prior art has the following disadvantages: it cannot achieve micro-pulses from 50 mA to 5000 mA and meet the data requirements of the current wave double-exponential function (Equation 1); the reason is that in the existing technical solutions, the control of the charge quantity cannot achieve the effect of micro-pulses, and in the above-mentioned technology, the resistance Rm and the inductance Lr cannot support the standard of micro-pulses in the processing of the waveform rise and fall; therefore, the present technical solution proposes a lightning surge generator for a micro-pulse interference source. Summary of the Invention

[0006] The present invention provides a lightning surge generator for a micro-pulse interference source, which solves the above problems.

[0007] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0008] A lightning surge generator for a micro-pulse interference source of the present invention includes a high-voltage generator U, a first pre-charge resistor Rc2, a second pre-charge resistor Rc3, a switch Switch, an inductor Lr2, a resistor Rm2 connected in sequence, and two terminals located at both ends of the high-voltage generator U and the resistor Rm2 respectively;

[0009] A main energy storage capacitor Cc2 is connected in parallel between the first pre-charge resistor Rc2 and the second pre-charge resistor Rc3 and between the high-voltage generator U and one terminal;

[0010] A secondary processing capacitor Cc3 is connected in parallel between the second pre-charge resistor Rc3, the switch Switch, and between the high-voltage generator U and one terminal;

[0011] A resistor Rs3 is connected in parallel between the switch Switch, the inductor Lr2, and between the high-voltage generator U and one terminal;

[0012] The current of the present technical solution passes through the first pre-charge resistor Rc2 and then adds the main capacitor Cc2, which hinders the movement of charges and causes the charges to accumulate in the main capacitor Cc2, resulting in the cumulative storage of charges; however, the amount of charges is still too large for micro-pulses at this time, so this solution performs secondary processing on the amount of charges; and then passes through the high-resistance second pre-charge resistor Rc3 to accumulate a small amount of charges on the secondary processing capacitor Cc3 with a small capacitance; at this time, the release of micro-charges meets the effect of the micro-pulse interference source.

[0013] The current waveform also needs to meet the double-exponential function of the national standard current waveform (Equation 1), so the inductor Lr2 and resistor Rm2 are processed. The processing method is to increase the inductance of the inductor Lr2. The reason is that the secondary-processed capacitor Cc3 has only a very small amount of charge, so the rising edge and the entire discharge process will be very fast. When the inductor Lr2 is increased, when the current changes, the intensity of this magnetic field will also change, which will generate a self-induced electromotive force to hinder the change of the current. Only in this way can the requirements of the double-exponential function of the current waveform (Equation 1) be met.

[0014] The present utility model has the following beneficial effects compared with the prior art:

[0015] This technical solution better solves the micro-pulse standard interference source and supplements the micro-pulse in the field of lightning surge generators.

[0016] Of course, it is not necessary for any product implementing the present utility model to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. 18 is a schematic structural diagram of a lightning surge generator of an existing micro-pulse interference source;

[0019] Figure 2 FIG. 22 is a schematic structural diagram of a lightning surge generator for a micro-pulse interference source according to the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0021] In the description of the present utility model, it should be understood that the terms "connection", "both ends", "parallel connection", etc. indicating the orientation or positional relationship are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0022] Such asFigure 1 As shown, it is the structural schematic diagram of a lightning surge generator for an existing micro-pulse interference source;

[0023] Please refer to Figure 2 As shown, a lightning surge generator for a micro-pulse interference source of the present invention includes a high-voltage generator U, a first pre-charge resistor Rc2, a second pre-charge resistor Rc3, a switch Switch, an inductor Lr2, a resistor Rm2, which are connected in sequence, and two terminals located at both ends of the high-voltage generator U and the resistor Rm2 respectively;

[0024] A main energy storage capacitor Cc2 is connected in parallel between the first pre-charge resistor Rc2 and the second pre-charge resistor Rc3, and between the high-voltage generator U and one terminal;

[0025] A secondary processing capacitor Cc3 is connected in parallel between the second pre-charge resistor Rc3, the switch Switch, and between the high-voltage generator U and one terminal;

[0026] A resistor Rs3 is connected in parallel between the switch Switch, the inductor Lr2, and between the high-voltage generator U and one terminal;

[0027] The current of this technical solution passes through the first pre-charge resistor Rc2 and then adds the main capacitor Cc2, which hinders the movement of charges and causes the charges to accumulate in the main capacitor Cc2, resulting in the cumulative storage of charges; however, the amount of charge is still too large for micro-pulses at this time, so this solution performs secondary processing on the amount of charge; and then passes through the high-resistance second pre-charge resistor Rc3 to accumulate a small amount of charge on the secondary processing capacitor Cc3 with a small capacitance; at this time, the release of micro-amounts of charge meets the effect of the micro-pulse interference source.

[0028] The current waveform also needs to meet the national standard current waveform double-exponential function (such as Equation 1 in the background technology), so the inductor Lr2 and the resistor Rm2 are processed. The processing method is to increase the inductance of the inductor Lr2; the reason is that the secondary processing capacitor Cc3 has only a very small amount of charge, so the rising edge and the speed of the entire discharge process will be very fast. When the inductor Lr2 is increased and the current changes, the intensity of this magnetic field will also change, which will generate a self-induced electromotive force to hinder the change of the current. Only at this time can the requirements of the current waveform double-exponential function (such as Equation 1 in the background technology) be met;

[0029] This technical solution solves the micro-pulse standard interference source and supplements the micro-pulse in the field of lightning surge generators.

[0030] The working principle of this technical solution is:

[0031] First, add the first pre-charging resistor Rc2 to the charging circuit and connect to the main energy storage capacitor Cc2. Then add the second pre-charging resistor Rc3 and the secondary processing capacitor Cc3 with small energy storage to the secondary charging circuit. Then, the switch Switch is needed for discharge. When charging, the switch is turned off to charge the capacitor. When current needs to be released, the switch is turned on. The main circuit switch is closed and combined to form a discharge loop.

[0032] When the electronic switch Switch is turned on, the energy storage capacitor needs to discharge to the resistor Rm2 and inductor Lr2, so the resistor Rm2 and the inductor Lr2 are connected in series, and the primary terminal is short-circuited with the COM terminal when testing the current; therefore, the inductor Lr2 also plays an energy storage role, and one end of the resistor RS3 is connected to the inductor Lr2 and the other end is connected to the terminal COM. In this way, when the energy storage capacitor charge gradually decreases, the charge will be absorbed and discharged by the resistor Rm2 and the resistor RS3.

[0033] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lightning surge generator for a micro-pulse interference source, characterized in that, It includes a high-voltage generator U, a first pre-charge resistor Rc2, a second pre-charge resistor Rc3, a switch Switch, an inductor Lr2, a resistor Rm2, and two terminals located at both ends of the high-voltage generator U and the resistor Rm2, which are connected in sequence; A main energy storage capacitor Cc2 is connected in parallel between the first pre-charge resistor Rc2 and the second pre-charge resistor Rc3, and between the high-voltage generator U and one terminal; A secondary processing capacitor Cc3 is connected in parallel between the second pre-charge resistor Rc3, the switch Switch, and between the high-voltage generator U and one terminal; A resistor Rs3 is connected in parallel between the switch Switch, the inductor Lr2, and between the high-voltage generator U and one terminal.

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