Mobile power supply system for testing direct-current high-voltage generator

Abstract

The invention relates to a mobile power supply system for testing a direct-current high-voltage generator. The system comprises a charging module, a battery, an inversion module, an isolation filtering module and a virtual grounding module, the input end of the charging module is used for connecting alternating-current mains supply, and the output end is connected with positive and negative electrodes of the battery; the first input end of the inversion module is connected with the anode of the battery, the second input end is connected with the cathode of the battery, and the output end is connected with the input end of the isolation filtering module; the output end of the isolation filtering module is connected with the input end of the direct-current high-voltage generator and the virtual grounding module. The virtual grounding module is further connected with the grounding detection module of the direct-current high-voltage generator. Alternating current is output through the battery, the inversion module and the isolation filtering module, a virtual grounding signal is generated through the virtual grounding module, the direct-current high-voltage generator receives the alternating current and the virtual grounding signal, the starting condition of the direct-current high-voltage generator can be met, a field test is started, and the test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of mobile power supply for testing a DC high voltage generator, and in particular to a mobile power supply system for testing a DC high voltage generator. Background Art

[0002] During the on-site testing of the DC high-voltage generator, it is often necessary to use a power cord reel to connect the test power supply from the maintenance power supply. The process of connecting the power supply and winding the wires is time-consuming and labor-intensive, and it is necessary to apply for the maintenance power supply from the relevant operation bureau. The maintenance power supply can only be used after multiple process approvals from the operation bureau. The application procedures are relatively cumbersome and time-consuming, which affects the efficiency of on-site testing.

[0003] However, the existing mobile power supplies cannot meet the requirements of on-site testing of DC high-voltage generators. For example, the DC high-voltage generator requires the mobile power supply to be grounded before the test can be started normally, but the existing mobile power supplies cannot meet the grounding conditions. Therefore, there is an urgent need for a mobile power supply system that can meet the requirements of on-site testing of DC high-voltage generators. Summary of the invention

[0004] Based on this, it is necessary to provide a mobile power supply system for DC high voltage generator testing that can meet the needs of DC high voltage generator on-site testing in response to the above technical problems.

[0005] In a first aspect, the present application provides a mobile power supply system for a DC high voltage generator test, the system comprising a charging module, a battery, an inverter module, an isolation filter module and a virtual ground module;

[0006] The input end of the charging module is used to connect to the AC mains, and the output end is connected to the positive and negative electrodes of the battery;

[0007] The first input terminal of the inverter module is connected to the positive electrode of the battery, the second input terminal is connected to the negative electrode of the battery, and the output terminal is connected to the input terminal of the isolation filter module;

[0008] The output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual grounding module respectively, and the virtual grounding module is also connected to the grounding detection module of the DC high voltage generator;

[0009] The charging module is used to process the AC mains and output it to the battery to charge the battery; the battery outputs a DC signal to the inverter module, the inverter module converts the DC signal into an AC signal and transmits it to the isolation filtering module, the isolation filtering module amplifies the AC signal, and transmits the amplified AC signal to the DC high-voltage generator, and to the virtual grounding module, the virtual grounding module uses the amplified AC signal to generate a virtual grounding signal, and transmits the virtual grounding signal to the grounding detection module of the DC high-voltage generator, so that the DC high-voltage generator starts boosting according to the amplified AC signal and the virtual grounding signal.

[0010] In one embodiment, the virtual grounding module includes a virtual grounding sub-module and a grounding signal output circuit, the virtual grounding sub-module includes a virtual grounding point, the output end of the isolation filtering module is connected to the first end of the grounding detection module of the DC high-voltage generator through the grounding signal output circuit, and the virtual grounding point is connected to the second end of the grounding detection module of the DC high-voltage generator.

[0011] In one embodiment, the output end of the isolation filter module includes a first output end and a second output end; the virtual grounding submodule includes a first resistor, a first capacitor, a second resistor, a second capacitor and a virtual grounding cable; the grounding detection module of the DC high voltage generator includes a third capacitor;

[0012] The first end of the first resistor is connected to the first output end of the isolation filter module, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second output end of the isolation filter module;

[0013] The first end of the first capacitor is connected to the first output end of the isolation filter module, the second end of the first capacitor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second output end of the isolation filter module;

[0014] The first end of the virtual ground cable is connected to the middle point where the first resistor and the second resistor are connected and the middle point where the first capacitor and the second capacitor are connected, respectively, and the second end of the virtual ground cable is connected to the second end of the ground detection module of the DC high voltage generator.

[0015] In one embodiment, the ground signal output circuit includes a third resistor, a fourth resistor, a first diode and a second diode;

[0016] The first end of the third resistor is connected to the first output end of the isolation filter module, the second end of the third resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the first end of the grounding detection module of the DC high voltage generator;

[0017] The first end of the fourth resistor is connected to the second output end of the isolation filter module, the second end of the fourth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the first end of the grounding detection module of the DC high voltage generator.

[0018] In one embodiment, the isolation filter module includes a high-frequency transformer, a first filter inductor, a first filter capacitor, and an output contactor;

[0019] The first output end of the high-frequency transformer is connected to the first end of the first filter inductor, the second end of the first filter inductor is connected to the first contact of the output contactor, and the second contact of the output contactor serves as the first output end of the isolation filter module;

[0020] The second end of the first filter inductor is also connected to the first end of the first filter capacitor, the second end of the first filter capacitor is connected to the second output end of the high-frequency transformer, and the second end of the first filter capacitor also serves as the second output end of the isolation filter module.

[0021] In one embodiment, the inverter module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a second filter inductor, a third filter inductor and a second filter capacitor;

[0022] The drain of the first MOS tube is connected to the positive electrode of the battery, and the gate is connected to the drain of the second MOS tube; the gate of the second MOS tube is connected to the negative electrode of the battery;

[0023] The drain of the third MOS tube is connected to the positive electrode of the battery, and the gate is connected to the drain of the fourth MOS tube; the gate of the fourth MOS tube is connected to the negative electrode of the battery;

[0024] The gate of the first MOS transistor is also connected to the first end of the second filter inductor, the second end of the second filter inductor is connected to the first end of the second filter capacitor, the second end of the second filter capacitor is connected to the first end of the third filter inductor, and the second end of the third filter inductor is connected to the drain of the fourth MOS transistor;

[0025] The first end of the second filter capacitor is also connected to the first input end of the high-frequency transformer, and the second end of the second filter capacitor is also connected to the second input end of the high-frequency transformer.

[0026] In one embodiment, the output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual ground module respectively through an output contactor;

[0027] The system further includes a safety detection circuit, which includes a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth MOS transistor, a sixth MOS transistor, a third diode, a fourth diode, and a current limiting unit;

[0028] The first end of the fifth resistor is connected to the positive electrode of the battery, and the first end of the sixth resistor is connected to the negative electrode of the battery;

[0029] The second end of the fifth resistor is connected to the second end of the sixth resistor, the first end of the fifth resistor is also connected to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is connected to the first end of the sixth resistor;

[0030] The first end of the fourth capacitor is also connected to the drain of the fifth MOS transistor, the gate of the fifth MOS transistor is connected to the first input end of the high-frequency transformer, the gate of the fifth MOS transistor is also connected to the drain of the sixth MOS transistor, and the gate of the sixth MOS transistor is connected to the second end of the fifth capacitor; the second end of the fifth resistor is also connected to the second end of the fourth capacitor, and the second end of the fourth capacitor is also connected to the second input end of the high-frequency transformer;

[0031] The anode of the third diode is connected to the first output terminal of the high-frequency transformer, the cathode of the third diode is connected to the first end of the fifth capacitor, the first end of the fifth capacitor is also connected to the first end of the current limiting unit, and the second end of the fifth capacitor is connected to the second end of the current limiting unit; the anode of the fourth diode is connected to the second output terminal of the high-frequency transformer, the cathode of the fourth diode is connected to the first end of the fifth capacitor; the second end of the fifth capacitor is also connected to the neutral point of the high-frequency transformer;

[0032] The current limiting unit is used to control the output contactor to enter a cut-off state to cut off the output when the received current or voltage does not meet a preset condition.

[0033] In one embodiment, the charging module includes a plurality of MOS tubes, and the input end of the charging module is connected to the AC mains through an input contactor; the inverter module includes a plurality of MOS tubes; the output end of the isolation filter module is respectively connected to the input end of the DC high voltage generator and the virtual ground module through an output contactor;

[0034] The system also includes an overheat protection module;

[0035] The overheat protection module is used to detect the temperature of the battery and the temperature of each of the MOS tubes. When any detected temperature exceeds a preset temperature threshold, the input contactor and the output contactor are controlled to enter a cut-off state to cut off the output and the input of the AC mains.

[0036] In one of the embodiments, the system further includes a short circuit protection module;

[0037] The short circuit protection module is used to detect the battery voltage, charging current and discharging current. When any detection value exceeds the corresponding preset threshold condition, the input contactor and the output contactor are controlled to enter the cut-off state to cut off the output and cut off the input of the AC mains.

[0038] In one embodiment, the output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual ground module respectively through an output contactor;

[0039] The system also includes a ground detection module;

[0040] The grounding detection module is used to control the output contactor to enter a cut-off state to cut off the output when it is detected that the DC high-voltage generator is not grounded.

[0041] In a second aspect, an embodiment of the present application further provides a mobile power supply device, which includes the above-mentioned mobile power supply system for DC high-voltage generator testing.

[0042] The above-mentioned mobile power supply system for testing the DC high-voltage generator processes the AC mains power and outputs it to the battery through the charging module; the DC power of the battery is converted into AC power through the inverter module and then transmitted to the isolation filter module, the isolation filter module then amplifies the received AC power and then transmits it to the DC high-voltage generator so that the DC high-voltage generator can obtain the required test power supply. At the same time, the virtual grounding module uses the amplified AC power to generate a virtual grounding signal and transmits it to the grounding detection module of the DC high-voltage generator. The DC high-voltage generator can only start working after receiving the required experimental power supply and virtual grounding signal. The mobile power supply system for testing the DC high-voltage generator provided in the present application outputs a virtual grounding signal to the DC high-voltage generator through the virtual grounding module, thereby meeting the grounding requirements of the DC high-voltage generator on-site test. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] FIG1 is a first schematic structural diagram of a mobile power supply system for a DC high voltage generator test in one embodiment;

[0045] FIG2 is a second schematic structural diagram of a mobile power supply system for a DC high voltage generator test in one embodiment;

[0046] FIG3 is a schematic structural diagram of a virtual ground module in one embodiment;

[0047] FIG4 is a schematic structural diagram of an inverter module in one embodiment;

[0048] FIG. 5 is a schematic structural diagram of a safety detection circuit in one embodiment. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and combined with it as a whole, or there may be an intermediate element at the same time. The terms "disconnected", "one end", "the other end" and similar expressions used in this article are for illustrative purposes only.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0054] During the on-site test of the DC high-voltage generator, it is often necessary to use a power cord reel to connect the test power supply from the maintenance power supply. The process of connecting the power supply and winding the line is time-consuming and labor-intensive, and it is necessary to apply for the maintenance power supply from the relevant operation bureau. The maintenance power supply can only be used after multiple process approvals from the operation bureau. The application procedures are relatively cumbersome and time-consuming, which affects the efficiency of on-site testing.

[0055] However, the existing mobile power supplies cannot meet the requirements of on-site testing of DC high-voltage generators. For example, the DC high-voltage generator requires the mobile power supply to be grounded before the test can be started normally, but the existing mobile power supplies cannot meet the grounding conditions. Therefore, there is an urgent need for a mobile power supply system that can meet the requirements of on-site testing of DC high-voltage generators.

[0056] In order to meet the requirements of on-site experiments of DC high-voltage generators, an embodiment of the present application provides a mobile power supply system for DC high-voltage generator tests, as shown in FIG1 , which is a schematic structural diagram of an exemplary embodiment of a mobile power supply system for DC high-voltage generator tests of the present application; including a charging module 210, a battery 220, an inverter module 230, an isolation filter module 240 and a virtual ground module 250;

[0057] The input end of the charging module 210 is used to connect to the AC mains, and the output end is connected to the positive and negative electrodes of the battery 220;

[0058] The first input terminal of the inverter module 230 is connected to the positive electrode of the battery 220 , the second input terminal is connected to the negative electrode of the battery 220 , and the output terminal is connected to the input terminal of the isolation filter module 240 ;

[0059] The output end of the isolation filter module 240 is respectively connected to the input end of the DC high voltage generator and the virtual grounding module 250, and the virtual grounding module 250 is also connected to the grounding detection module of the DC high voltage generator;

[0060] The charging module is used to process the AC mains and output it to the battery 220 to charge the battery 220; the battery 220 outputs a DC signal to the inverter module 230, the inverter module 230 converts the DC signal into an AC signal and transmits it to the isolation filter module 240, the isolation filter module 240 amplifies the AC signal, and transmits the amplified AC signal to the DC high-voltage generator, and to the virtual grounding module 250, the virtual grounding module 250 uses the amplified AC signal to generate a virtual grounding signal, and transmits the virtual grounding signal to the grounding detection module of the DC high-voltage generator, so that the DC high-voltage generator starts boosting according to the amplified AC signal and the virtual grounding signal.

[0061] Specifically, the charging module 210 charges the battery by controlling the chopping voltage reduction through PWM (Pulse Width Modulation). The charging part uses software to set the fast charging and slow charging modes, tests the battery voltage and charging current and discharging current, prevents damage to the battery due to overvoltage, prevents damage to the battery due to overcharging, and monitors the discharge current to prevent over-discharge; and adds a short-circuit protection function. When the external device is short-circuited due to external flashover or damage to the tested device, the system can quickly cut off the output to protect the mobile power supply system from damage due to external reverse power transmission. Among them, the battery can be a large-capacity lithium iron phosphate battery or other batteries that meet the requirements.

[0062] Specifically, an isolation transformer is provided inside the isolation filter module 240. It should be understood that the isolation transformer can also be a high-frequency transformer, which has the same function; the isolation transformer isolates the battery output voltage from the AC output voltage, and uses the filter inductor to output the SPWM (Sinusoidal Pulse Width Modulation) output waveform through LC filtering to output the required AC voltage, thereby completing the conversion of the battery voltage into an AC 220V output; the battery is isolated from the output by an isolation transformer to meet the grounding of any point at the back end and the simulated grounding point, and will not cause the equipment to trip or the mains to leak to the ground, thereby ensuring the output of the mobile power supply system, and at the same time ensuring that the battery is not affected by the load on the AC output side, thereby ensuring the safety of the battery.

[0063] Specifically, the virtual grounding module 250 can realize the function of generating a virtual grounding signal by setting a virtual grounding point. By setting the virtual grounding point, it is possible to check whether the output loop of the mobile power supply system is grounded, and to ensure that the mobile power supply system is in a grounded state at all times. Even if the mobile power supply system is not grounded using a grounding wire, the mobile power supply system can be grounded through virtual grounding, thereby protecting the mobile power supply system itself from being damaged by the induced voltage and the overvoltage counterattack of the external output device.

[0064] Exemplarily, as shown in FIG2 , the charging module 210 may include an input contactor and an AC / DC (alternating current to direct current) conversion module; in actual applications, the charging module 210 may use software to set fast charging and slow charging modes, and the system tests the battery voltage, charging current, and discharge current to prevent damage to the battery caused by overvoltage, prevent damage to the battery caused by overcharging, and monitor the discharge current to prevent over-discharge; and add a short-circuit protection function. When the external device is short-circuited due to external flashover or damage to the tested device, the system can quickly cut off the output to prevent the fault from expanding; and can detect the battery temperature and the MOS (metal oxide semiconductor field effect transistor) tube temperature inside the charging module When the preset temperature is exceeded, the output is shut down internally and the charging function is turned off; the battery 220 may include a large-capacity battery; the inverter module 230 may include a DC / AC (direct current to alternating current) conversion module; the isolation filter module 240 may include a high-frequency transformer, a filter inductor, a filter capacitor and an output contactor; the virtual grounding module 250 may include a simulated artificial grounding point and a corresponding circuit connected to the grounding detection; it should be noted that the test equipment (load) is a peripheral device of the mobile power supply system for the DC high-voltage generator test in this embodiment, such as a DC high-voltage generator; the grounding detection part not included in Figure 2 is a schematic diagram of the ground detection module of the DC high-voltage generator.

[0065] In the above-mentioned mobile power supply system for the DC high-voltage generator test, the AC mains is processed by the charging module and then output to the battery; the DC power of the battery is converted into AC power by the inverter module and then transmitted to the isolation filter module, the isolation filter module then amplifies the received AC power and then transmits it to the DC high-voltage generator, so that the DC high-voltage generator can obtain the required test power supply. At the same time, the virtual grounding module uses the amplified AC power to generate a virtual grounding signal and transmits it to the grounding detection module of the DC high-voltage generator. The DC high-voltage generator can only start working after receiving the required mobile power supply system for the experiment and the virtual grounding signal. This application proposes The mobile power supply system for DC high-voltage generator testing provided by the present invention outputs a virtual ground signal to the DC high-voltage generator through a virtual ground module, thereby meeting the grounding requirements of on-site testing of the DC high-voltage generator. The mobile power supply system for DC high-voltage generator testing provided by the present embodiment can meet the power supply requirements of all conventional test instruments on site. Conventional test instruments include automatic dielectric loss tester, loop resistance tester, DC resistance tester, 300kV / 8mA DC high-voltage generator, circuit breaker action characteristic tester and other instruments. During on-site use, there is no need to connect to the test power supply, thus eliminating the use of power cord reels and improving the efficiency of on-site testing.

[0066] In an exemplary embodiment, the virtual grounding module includes a virtual grounding sub-module and a grounding signal output circuit, the virtual grounding sub-module includes a virtual grounding point, the output end of the isolation filtering module is connected to the first end of the grounding detection module of the DC high-voltage generator through the grounding signal output circuit, and the virtual grounding point is connected to the second end of the grounding detection module of the DC high-voltage generator.

[0067] Among them, the virtual grounding submodule is used to set a virtual grounding point and connect the virtual grounding point with the grounding detection module of the DC high-voltage generator; the grounding signal output circuit is used to process the AC signal output by the isolation filter module and transmit it to the grounding detection module of the DC high-voltage generator; through the virtual node and the connection between the grounding signal output circuit and the grounding detection module, a grounding detection loop is formed. It should be noted that the virtual grounding point is not an actual physical ground wire, but a potential reference point. In this way, a local ground potential can be created for signal reference in the circuit, that is, the virtual grounding module can provide a zero-position reference signal in the mobile power supply system to the DC high-voltage generator, so that the DC high-voltage generator can meet the startup conditions.

[0068] In an exemplary embodiment, as shown in FIG3 , the output end of the isolation filter module includes a first output end ACin1 and a second output end ACin2, the virtual grounding submodule includes a first resistor R1, a first capacitor C1, a second resistor R2, a second capacitor C2 and a virtual grounding cable 251; the grounding detection module of the DC high voltage generator includes a third capacitor C3;

[0069] The first end of the first resistor R1 is connected to the first output end ACin1 of the isolation filtering module, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the second output end ACin2 of the isolation filtering module; the first end of the first capacitor C1 is connected to the first output end ACin1 of the isolation filtering module, the second end of the first capacitor C1 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the second output end ACin2 of the isolation filtering module; the first end of the virtual grounding cable is respectively connected to the middle point where the first resistor R1 and the second resistor R2 are connected and the middle point where the first capacitor C1 and the second capacitor C2 are connected, and the second end of the virtual grounding cable is connected to the second end of the grounding detection module of the DC high voltage generator.

[0070] Among them, the virtual grounding cable 251 includes a point 2511 and a point 2512, and the grounding symbol adjacent to the point 2512 is only used for grounding indication, not actual grounding. When the point 2511 is connected to the point 2512, one end of the virtual grounding cable 251 is connected to the middle point where the first end is connected to the first resistor and the second resistor, and the second end of the virtual grounding cable 251 is connected to the second end of the grounding detection module of the DC high voltage generator. Specifically, as shown in FIG3, the second end of the grounding detection module of the DC high voltage generator can be the second end of the optocoupler IC1.

[0071] In an exemplary embodiment, as shown in FIG3 , the ground signal output circuit includes a third resistor R3 , a fourth resistor R4 , a first diode D1 , and a second diode D2 ;

[0072] The first end of the third resistor R3 is connected to the first output end ACin1 of the isolation filter module, the second end of the third resistor R3 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the first end of the grounding detection module of the DC high voltage generator.

[0073] The first end of the fourth resistor R4 is connected to the second output end ACin2 of the isolation filter module, the second end of the fourth resistor R4 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the first end of the grounding detection module of the DC high voltage generator. Specifically, as shown in FIG3 , the first end of the grounding detection module of the DC high voltage generator can be the first end of the optocoupler IC1.

[0074] Specifically, as shown in FIG3 , the virtual grounding and the grounding detection of the DC high voltage generator provided in this embodiment are described:

[0075] When point 2511 is not connected to point 2512, in the R3, D1, D2, R4 loop, since D1 and D2 are cut off, the loop is not conductive, the driving end of the optocoupler IC1 has no loop, the output end of the optocoupler IC1 is not conductive, the voltage of R6 to ground is 0, and the output of R7 is 0V.

[0076] When point 2511 and point 2512 are connected, since the two ends of the isolation filter module ACin1 and ACin2 are 220V AC, since R1=R2=20kΩ, C1=C2=0.1uF; the middle position of the intermediate voltage divider is used as the analog grounding point;

[0077] When point 2511 is connected to the analog ground point, R3=R4=20kΩ, the driving current of the conventional optocoupler is greater than 1mA, and the optocoupler is in the amplification state. When the driving current is greater than the working current of IC1, the optocoupler is in the switching state, and a pulse voltage appears at both ends of R6.

[0078] When the positive half-wave of AC passes through R3, D1, and IC1 to the analog ground, and when the peak voltage of the AC voltage is greater than 30V, IC1 starts to conduct, and the output terminal R6 of IC1 outputs a positive pulse;

[0079] When the negative half-wave of AC passes through R4, D2, and IC1 to the analog ground, and also when the peak voltage of the AC voltage is greater than 30V, IC1 starts to conduct, and the output terminal R6 of IC1 outputs a positive pulse;

[0080] Therefore, when the AC input is greater than 30V, the output of the back end of the optocoupler IC1 is a 100Hz pulse waveform; after simple filtering through R7 and C3, an easily measurable DC voltage is obtained, and the grounding monitoring module of the DC high-voltage generator uses this to determine whether the mobile power supply system for the DC high-voltage generator test is grounded.

[0081] In this embodiment, the on-site test instrument, i.e., the DC high voltage generator, is grounded, but the mobile power supply system is not grounded. The mobile power supply system for the DC high voltage generator test is grounded through a virtual grounding point, which can not only pass the grounding detection of the DC high voltage generator, but also ensure that the mobile power supply system is not damaged by external induced voltage.

[0082] In an exemplary embodiment, as shown in Figure 2, the isolation filtering module 240 includes a high-frequency transformer, a first filter inductor, a first filter capacitor and an output contactor; the first output end of the high-frequency transformer is connected to the first end of the first filter inductor, the second end of the first filter inductor is connected to the first contact of the output contactor, and the second contact of the output contactor serves as the first output end of the isolation filtering module 240; the second end of the first filter inductor is also connected to the first end of the first filter capacitor, the second end of the first filter capacitor is connected to the second output end of the high-frequency transformer, and the second end of the first filter capacitor also serves as the second output end of the isolation filtering module 240.

[0083] In an exemplary embodiment, as shown in FIG4 , the inverter module 230 includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a second filter inductor L2, a third filter inductor L3 and a second filter capacitor C2;

[0084] The drain of the first MOS tube Q1 is connected to the positive electrode of the battery, and the gate is connected to the drain of the second MOS tube Q2; the gate of the second MOS tube Q2 is connected to the negative electrode of the battery;

[0085] The drain of the third MOS tube Q3 is connected to the positive electrode of the battery, and the gate is connected to the drain of the fourth MOS tube Q4; the gate of the fourth MOS tube Q4 is connected to the negative electrode of the battery;

[0086] The gate of the first MOS transistor Q1 is also connected to the first end of the second filter inductor L2, the second end of the second filter inductor L2 is connected to the first end of the second filter capacitor C2, the second end of the second filter capacitor C2 is connected to the first end of the third filter inductor L3, and the second end of the third filter inductor L3 is connected to the drain of the fourth MOS transistor Q4;

[0087] The first end of the second filter capacitor C2 is also connected to the first input end ACout1 of the high-frequency transformer, and the second end of the second filter capacitor is also connected to the second input end ACout2 of the high-frequency transformer.

[0088] Among them, the current detection device I1 shown in FIG5 can be used to monitor the discharge current of the battery to prevent over-discharge, that is, when the discharge current is greater than the preset threshold, the output contactor in the isolation filter module 240 is controlled to be cut off, and the output connection with the load is disconnected. The embodiment of the present application inverts the DC power of the battery into AC power and supplies it to the isolation filter module through the above scheme. Specifically, through the full-bridge structure composed of four MOS tubes, efficient conversion of DC-AC (direct current to alternating current) can be achieved; each MOS tube is alternately turned on and off to generate the required AC output; through the second filter inductor L2, the third filter inductor L3 and the second filter capacitor (C2), these components constitute an LC filter, which helps to smooth the output waveform, reduce harmonic distortion, and improve output quality.

[0089] In an exemplary embodiment, as shown in FIG2 , the output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual ground module respectively through an output contactor;

[0090] The above system also includes a safety detection circuit 260, as shown in FIG5 , the safety detection circuit 260 includes a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a third diode D3, a fourth diode D4 and a current limiting unit 261;

[0091] A first end of the fifth resistor R5 is connected to the positive electrode DC+ of the battery, and a first end of the sixth resistor R6 is connected to the negative electrode DC- of the battery;

[0092] The second end of the fifth resistor R5 is connected to the second end of the sixth resistor R6, the first end of the fifth resistor R5 is also connected to the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected to the first end of the sixth resistor R6;

[0093] The first end of the fourth capacitor C4 is also connected to the drain of the fifth MOS transistor Q5, the gate of the fifth MOS transistor Q5 is connected to the first input end of the high-frequency transformer T1, the gate of the fifth MOS transistor Q5 is also connected to the drain of the sixth MOS transistor Q6, and the gate of the sixth MOS transistor Q6 is connected to the second end of the fifth capacitor C5; the second end of the fifth resistor R5 is also connected to the second end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is also connected to the second input end of the high-frequency transformer T1;

[0094] The anode of the third diode D3 is connected to the first output terminal of the high-frequency transformer T1, the cathode of the third diode D3 is connected to the first end of the fifth capacitor C5, the first end of the fifth capacitor C5 is also connected to the first end of the current limiting unit 261, and the second end of the fifth capacitor C5 is connected to the second end of the current limiting unit 261; the anode of the fourth diode D4 is connected to the second output terminal of the high-frequency transformer T1, the cathode of the fourth diode D4 is connected to the first end of the fifth capacitor C5; the second end of the fifth capacitor C5 is also connected to the neutral point of the high-frequency transformer T1;

[0095] The current limiting unit 261 is used to control the output contactor shown in FIG. 2 to enter a cut-off state to cut off the output of the isolation filter module 240 when the received current or voltage does not meet a preset condition.

[0096] It should be noted that the high-frequency transformer T1 shown in FIG5 is the same transformer as the high-frequency transformer shown in FIG2, and the safety detection circuit shown in FIG5 is in parallel with the isolation filter module 240 in FIG2. Based on the above structure, this embodiment can achieve timely control through the current limiting unit 261 when the current and / or voltage on the output side of the high-frequency transformer is too high, reduce the output power or cut off the output, and ensure that the output of the system is within a safe range.

[0097] In an exemplary embodiment, the charging module includes a plurality of MOS tubes, and the input end of the charging module is connected to the AC mains through an input contactor; the inverter module includes a plurality of MOS tubes; the output end of the isolation filter module is respectively connected to the input end of the DC high voltage generator and the virtual ground module through an output contactor; the system also includes an overheat protection module; the overheat protection module is used to detect the temperature of the battery and the temperature of each of the MOS tubes, and when any detected temperature exceeds a preset temperature threshold, the input contactor and the output contactor are controlled to enter a cut-off state to cut off the output and the input of the AC mains. Among them, the overheat protection module can detect the temperature of the battery and the temperature of each MOS tube, and the detection method is not specifically limited here; the overheat protection module can also be connected to the input contactor and the output contactor, and can control the on-off state of the input contactor and the output contactor, so as to avoid overheating of the main components in the system, and timely cut off the output when the system is overheated, so as to prevent the battery from catching fire due to overheating and causing a fire.

[0098] In an exemplary embodiment, the system also includes a short-circuit protection module; the short-circuit protection module is used to detect the battery voltage, charging current and discharging current. When any detection value exceeds the corresponding preset threshold condition, the input contactor and the output contactor are controlled to enter the cut-off state to cut off the output and cut off the input of the AC mains. Among them, the short-circuit protection module can detect the battery voltage, charging current and discharging current, and the detection method is not specifically limited here; the short-circuit protection module can also be connected to the input contactor and the output contactor respectively, and the on-off state of the input contactor and the output contactor can be controlled respectively to avoid overvoltage or overcurrent in the system. When charging, the battery can be charged with a constant current by PWM control chopping step-down to ensure charging safety.

[0099] In an exemplary embodiment, the output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual grounding module respectively through an output contactor; the system also includes a grounding detection module; the grounding detection module is used to control the output contactor to enter a cut-off state when detecting that the DC high voltage generator is not grounded, so as to cut off the output, that is, the mobile power supply system no longer outputs AC voltage to the DC high voltage generator. Among them, the grounding detection module of the mobile power supply system for testing the DC high voltage generator is different from the grounding detection module of the DC high voltage generator. The grounding detection module of the mobile power supply system for testing the DC high voltage generator can detect whether the DC high voltage generator connected to the system is grounded, and the detection method is not specifically limited here; the grounding detection module of the mobile power supply system for testing the DC high voltage generator can also be connected to the output contactor, and the on-off state of the output contactor can be controlled to avoid ungrounded loads from being connected to the system.

[0100] In an exemplary embodiment, a mobile power supply device is provided, which includes the above-mentioned mobile power supply system for DC high-voltage generator testing.

[0101] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0102] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A mobile power supply system for DC high voltage generator testing, characterized in that: The system includes a charging module, a battery, an inverter module, an isolation filter module and a virtual grounding module; The input end of the charging module is used to connect to the AC mains, and the output end is connected to the positive and negative electrodes of the battery; The first input terminal of the inverter module is connected to the positive electrode of the battery, the second input terminal is connected to the negative electrode of the battery, and the output terminal is connected to the input terminal of the isolation filter module; The output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual grounding module respectively, and the virtual grounding module is also connected to the grounding detection module of the DC high voltage generator; The charging module is used to process the AC mains and output it to the battery to charge the battery; the battery outputs a DC signal to the inverter module, the inverter module converts the DC signal into an AC signal and transmits it to the isolation filtering module, the isolation filtering module amplifies the AC signal, and transmits the amplified AC signal to the DC high-voltage generator, and to the virtual grounding module, the virtual grounding module uses the amplified AC signal to generate a virtual grounding signal, and transmits the virtual grounding signal to the grounding detection module of the DC high-voltage generator, so that the DC high-voltage generator starts boosting according to the amplified AC signal and the virtual grounding signal.

2. The mobile power supply system for DC high voltage generator testing according to claim 1, characterized in that: The virtual grounding module includes a virtual grounding submodule and a grounding signal output circuit, the virtual grounding submodule includes a virtual grounding point, the output end of the isolation filtering module is connected to the first end of the grounding detection module of the DC high-voltage generator through the grounding signal output circuit, and the virtual grounding point is connected to the second end of the grounding detection module of the DC high-voltage generator.

3. The mobile power supply system for DC high voltage generator testing according to claim 2 is characterized in that: The output end of the isolation filter module includes a first output end and a second output end; the virtual grounding submodule includes a first resistor, a first capacitor, a second resistor, a second capacitor and a virtual grounding cable; the grounding detection module of the DC high voltage generator includes a third capacitor; The first end of the first resistor is connected to the first output end of the isolation filter module, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second output end of the isolation filter module; The first end of the first capacitor is connected to the first output end of the isolation filter module, the second end of the first capacitor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second output end of the isolation filter module; The first end of the virtual ground cable is connected to the middle point where the first resistor and the second resistor are connected and the middle point where the first capacitor and the second capacitor are connected, respectively, and the second end of the virtual ground cable is connected to the second end of the ground detection module of the DC high voltage generator.

4. The mobile power supply system for testing a DC high voltage generator according to claim 3, characterized in that: The ground signal output circuit includes a third resistor, a fourth resistor, a first diode and a second diode; The first end of the third resistor is connected to the first output end of the isolation filter module, the second end of the third resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the first end of the grounding detection module of the DC high voltage generator; The first end of the fourth resistor is connected to the second output end of the isolation filter module, the second end of the fourth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the first end of the grounding detection module of the DC high voltage generator.

5. The mobile power supply system for testing a DC high voltage generator according to claim 4, characterized in that: The isolation filter module includes a high-frequency transformer, a first filter inductor, a first filter capacitor and an output contactor; The first output end of the high-frequency transformer is connected to the first end of the first filter inductor, the second end of the first filter inductor is connected to the first contact of the output contactor, and the second contact of the output contactor serves as the first output end of the isolation filter module; The second end of the first filter inductor is also connected to the first end of the first filter capacitor, the second end of the first filter capacitor is connected to the second output end of the high-frequency transformer, and the second end of the first filter capacitor also serves as the second output end of the isolation filter module.

6. The mobile power supply system for testing a DC high voltage generator according to claim 5, characterized in that: The inverter module includes a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a second filter inductor, a third filter inductor and a second filter capacitor; The drain of the first MOS tube is connected to the positive electrode of the battery, and the gate is connected to the drain of the second MOS tube; the gate of the second MOS tube is connected to the negative electrode of the battery; The drain of the third MOS tube is connected to the positive electrode of the battery, and the gate is connected to the drain of the fourth MOS tube; the gate of the fourth MOS tube is connected to the negative electrode of the battery; The gate of the first MOS transistor is also connected to the first end of the second filter inductor, the second end of the second filter inductor is connected to the first end of the second filter capacitor, the second end of the second filter capacitor is connected to the first end of the third filter inductor, and the second end of the third filter inductor is connected to the drain of the fourth MOS transistor; The first end of the second filter capacitor is also connected to the first input end of the high-frequency transformer, and the second end of the second filter capacitor is also connected to the second input end of the high-frequency transformer.

7. The mobile power supply system for testing a DC high voltage generator according to claim 5, characterized in that: The output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual grounding module respectively through an output contactor; The system further includes a safety detection circuit, which includes a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth MOS transistor, a sixth MOS transistor, a third diode, a fourth diode, and a current limiting unit; The first end of the fifth resistor is connected to the positive electrode of the battery, and the first end of the sixth resistor is connected to the negative electrode of the battery; The second end of the fifth resistor is connected to the second end of the sixth resistor, the first end of the fifth resistor is also connected to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is connected to the first end of the sixth resistor; The first end of the fourth capacitor is also connected to the drain of the fifth MOS transistor, the gate of the fifth MOS transistor is connected to the first input end of the high-frequency transformer, the gate of the fifth MOS transistor is also connected to the drain of the sixth MOS transistor, and the gate of the sixth MOS transistor is connected to the second end of the fifth capacitor; the second end of the fifth resistor is also connected to the second end of the fourth capacitor, and the second end of the fourth capacitor is also connected to the second input end of the high-frequency transformer; The anode of the third diode is connected to the first output terminal of the high-frequency transformer, the cathode of the third diode is connected to the first end of the fifth capacitor, the first end of the fifth capacitor is also connected to the first end of the current limiting unit, and the second end of the fifth capacitor is connected to the second end of the current limiting unit; the anode of the fourth diode is connected to the second output terminal of the high-frequency transformer, the cathode of the fourth diode is connected to the first end of the fifth capacitor; the second end of the fifth capacitor is also connected to the neutral point of the high-frequency transformer; The current limiting unit is used to control the output contactor to enter a cut-off state to cut off the output when the received current or voltage does not meet a preset condition.

8. The mobile power supply system for testing a DC high voltage generator according to claim 1, characterized in that: The charging module includes a plurality of MOS tubes, and the input end of the charging module is connected to the AC mains through an input contactor; the inverter module includes a plurality of MOS tubes; the output end of the isolation filter module is respectively connected to the input end of the DC high voltage generator and the virtual ground module through an output contactor; The system also includes an overheat protection module; The overheat protection module is used to detect the temperature of the battery and the temperature of each of the MOS tubes. When any detected temperature exceeds a preset temperature threshold, the input contactor and the output contactor are controlled to enter a cut-off state to cut off the output and the input of the AC mains.

9. The mobile power supply system for testing a DC high voltage generator according to claim 8, characterized in that: The system also includes a short circuit protection module; The short circuit protection module is used to detect the battery voltage, charging current and discharging current. When any detection value exceeds the corresponding preset threshold condition, the input contactor and the output contactor are controlled to enter the cut-off state to cut off the output and cut off the input of the AC mains.

10. The mobile power supply system for testing a DC high voltage generator according to claim 1, characterized in that: The output end of the isolation filter module is connected to the input end of the DC high voltage generator and the virtual grounding module respectively through an output contactor; The system also includes a ground detection module; The grounding detection module is used to control the output contactor to enter a cut-off state to cut off the output when it is detected that the DC high-voltage generator is not grounded.

Images