WO2023202012A1 - 一种适应深地探测的电磁探测发射机系统及其控制方法 - Google Patents

一种适应深地探测的电磁探测发射机系统及其控制方法 Download PDF

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WO2023202012A1
WO2023202012A1 PCT/CN2022/125853 CN2022125853W WO2023202012A1 WO 2023202012 A1 WO2023202012 A1 WO 2023202012A1 CN 2022125853 W CN2022125853 W CN 2022125853W WO 2023202012 A1 WO2023202012 A1 WO 2023202012A1
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module
frequency
level
diodes
dummy load
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English (en)
French (fr)
Inventor
王颖杰
刘海媛
胡港中
孙涛
侯贺港
石玉
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/083—Controlled source electromagnetic [CSEM] surveying
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/083—Controlled source electromagnetic [CSEM] surveying
    • G01V2003/084—Sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to the field of electromagnetic detection transmitter systems, and in particular to an electromagnetic detection transmitter system adapted to deep ground exploration and a control method thereof.
  • detection methods mainly include physical detection, chemical detection and remote sensing technology.
  • detection methods the most commonly used is physical detection
  • electromagnetic exploration is a commonly used method of physical detection.
  • the electromagnetic exploration method can be divided into time domain electromagnetic method and frequency domain electromagnetic method according to the type of its response.
  • electromagnetic transmitters used in engineering are mainly divided into two categories.
  • the first type uses low-voltage batteries and increases the voltage through a boost circuit, so that the output voltage of the transmitter reaches hundreds of volts.
  • This type of transmitter is a small and medium power type. transmitter.
  • This transmitter has low power and is not suitable for deep ground exploration.
  • Transmitters used for deep ground exploration require thousands of volts of voltage and have large power output capabilities, and generally use multi-level transmitter circuits. Since high-power transmitters require fast and huge energy switching to generate strong electromagnetic induction, traditional high-power transmitters require step time for multi-level switching and the switching speed is slow. Rapid and huge energy switching causes the transmitter voltage to fluctuate greatly and takes a long time to stabilize, resulting in deformation of the transmit waveform, poor ability to output high-frequency signals, large primary interference, low electromagnetic detection accuracy, and difficulty in detecting weak signals deep in the ground.
  • the purpose of the present invention is to provide an electromagnetic detection transmitter system and a control method adapted to deep ground exploration, which have high dynamic response capabilities, can quickly suppress transient fluctuations of the transmission voltage, and can improve the transmission waveform. Frequency high power transmitter system.
  • the present invention adopts the following technical solutions:
  • the invention provides an electromagnetic detection transmitter system adapted to deep ground exploration and a control method thereof, which includes a generator electrically connected in sequence, a power frequency rectifier module, a series high-frequency DCDC module, a capacitor energy storage module, a dummy load module and three Level emission mode;
  • the generator outputs three-phase alternating current to power the entire system
  • the power frequency rectifier module is electrically connected to the generator and is used to rectify the three-phase alternating current of the generator and output direct current;
  • the series high-frequency DCDC module boosts or steps down the DC power output from the power frequency rectifier module to obtain a given reference value voltage
  • the capacitive energy storage module is used to store the electric energy output by the series high-frequency DCDC module;
  • the dummy load module is used to cooperate with the level switching of the three-level transmitting module
  • the three-level transmitting module is used to transmit three-level waveforms
  • the dummy load module and the three-level transmitting module are electrically connected with a cooperative transmitting module, and the cooperative transmitting module outputs instructions to the diodes in the dummy load module and the three-level transmitting module respectively;
  • the cooperative transmission module is connected to a timing module that provides GPS/Beidou timing.
  • the power frequency rectifier module includes an inductor electrically connected to the three-phase output terminal of the generator.
  • the inductor is connected to the three-phase rectifier bridge.
  • the output terminal of the three-phase rectifier bridge is connected in parallel with the capacitor C5 to convert the alternating current output by the generator into direct current.
  • the series-connected high-frequency DCDC module includes several high-frequency DCDC modules, the input terminals of the high-frequency DCDC module are electrically connected to both ends of the capacitor C5, and the output terminals of the high-frequency DCDC module are respectively connected to the corresponding capacitor storage.
  • the two ends of the capacitor in the module can be electrically connected;
  • the series coordination control module is electrically connected to each high-frequency DCDC module, and is used to output instructions to the diodes in each high-frequency DCDC module.
  • the high-frequency DCDC module includes an H-bridge inverter circuit composed of four diodes and a high-frequency transformer T, a single-phase rectifier bridge, an LC filter and a capacitor C that are electrically connected to the H-bridge inverter circuit in sequence.
  • the capacitor storage module includes four capacitors C1, C2, C3 and C4 connected in series.
  • the dummy load module includes a diode clamped three-level bridge arm, and the three-level bridge arm is provided with four diodes VT5, VT6, VT7, and VT8 connected in series; the three-level bridge arm The two ends are electrically connected to the two ends of the capacitor energy storage module respectively;
  • connection midpoints of the two diodes VT5 and VT6 and the connection midpoints of the two diodes VT7 and VT8 are respectively connected to the connection midpoints of the capacitors C2 and C3 in the capacitor energy storage module.
  • the connection midpoints of the two diodes VT6 and VT7 are connected to the three power
  • a resistive load is connected between the lower ends of the flat bridge arms.
  • the three-level transmitting module includes an H-bridge structure composed of two diode-clamped three-level bridge arms,
  • the upper and lower ends of the two three-level bridge arms are electrically connected to the upper and lower ends of the dummy load module respectively;
  • the three-level bridge arm on the left has four diodes VT9, VT10, VT11, and VT12 connected in series;
  • the three-level bridge arm on the right has four diodes VT13, VT14, VT15, and VT16 connected in series;
  • connection midpoints of diodes VT9 and VT10, the connection midpoints of diodes VT11 and VT12, the connection midpoints of diodes VT13 and VT14, the connection midpoints of diodes VT15 and VT16 are respectively the connection midpoints of capacitors C2 and C3 in the capacitor energy storage module.
  • the connection midpoints of diodes VT10 and VT11 are connected to electrode plate A
  • the midpoints of diodes VT14 and VT15 are connected to electrode plate B
  • electrode plate A and electrode plate B are connected to ground respectively.
  • the invention also provides a control method for an electromagnetic detection transmitter system adapted to deep ground exploration.
  • the system is provided with four high-frequency DCDC modules and includes the following steps:
  • Step A1 Collect the voltages V dc1 , V dc2 , V dc3 , and V dc4 and the current values I dc1 , I dc2 , I dc3 , and I dc4 of the output terminals of the four high-frequency DCDC modules respectively;
  • Step A3 Set the given reference value voltage The value minus V dc , that is, the error Then input the error value e 1 into the PI regulator to obtain the current given value
  • Step A5 Compare the difference obtained in step A4 with the current given value obtained after PI adjustment Do and calculate, i.e.
  • Step A6 Calculate the average voltage of the output voltages of the four high-frequency DCDC modules, and then make the difference with the voltage of each module, that is And perform P adjustment on each high-frequency DCDC module to obtain the deviation values ⁇ D 1 , ⁇ D 2 , ⁇ D 3 and ⁇ D 4 of the four high-frequency DCDC modules respectively;
  • the triangular wave B i is different from the triangular wave period by T/4 to realize carrier phase shift modulation and generate four high-frequency DCDC modules.
  • the switching signal S i therefore controls the voltage V dci and current I outi generated by the high-frequency DCDC module i.
  • the invention also provides a collaborative launch method for an electromagnetic detection transmitter system adapted to deep ground exploration, which includes the following steps:
  • Step B1 Receive timing module information
  • Step B2 Determine whether the timing module information reaches the transmission time, otherwise return to step B1, if not, enter step B3;
  • Step B3 Turn on the switching tubes VT 10 , VT 11 , VT 14 and VT 15 so that the three-level transmitting module outputs zero voltage;
  • Step B4 Turn on the switching tubes VT 5 and VT 6 and connect the dummy load
  • Step B5 After time Ts1, turn on the switching tubes VT 9 , VT 10 , VT 15 and VT 16 so that the three-level transmitting module outputs positive voltage;
  • Step B6 Turn on the switching tubes VT 6 and VT 7. At this time, the dummy load is in a zero voltage state;
  • Step B7 After time Ts3, turn off the switching tubes VT 6 and VT 7 and cut out the dummy load;
  • Step B8 After time Ts2, turn on the switching tubes VT 10 , VT 11 , VT 14 and VT 15 so that the three-level transmitting module outputs zero voltage;
  • Step B9 Turn on the switching tubes VT 6 and VT 7. At this time, the false load is zero voltage;
  • Step B10 After time Ts3, turn on the switching tubes VT 5 and VT 6 , and connect the dummy load;
  • Step B11 After time Ts1, turn on the switching tubes VT 11 , VT 12 , VT 13 and VT 14 so that the three-level transmitting module outputs negative voltage;
  • Step B12 Turn on the switching tubes VT 6 and VT 7 , and the dummy load has zero voltage;
  • Step B13 Turn off the switching tubes VT 6 and VT 7 after time Ts3, and cut out the dummy load;
  • Step B14 Choose whether to enter the next cycle; if so, return to step B3, otherwise end the program.
  • the beneficial effect of the present invention is that compared with the traditional high-power transmitter system, this solution uses a three-level transmit module, which eliminates the step time of the traditional multi-level transmit circuit, improves the dynamic response speed, and adopts a series coordination control module , the capacitor energy storage module, the dummy load module and the cooperative transmission module work together to reduce the transient fluctuations of the transmission voltage and increase the frequency of the transmission waveform.
  • the transmitter system adopts a modular structure, which can also greatly reduce the size and weight, which is beneficial to field transportation.
  • Figure 1 is a circuit connection diagram of an electromagnetic detection transmitter system adapted to deep ground exploration provided by an embodiment of the present invention
  • Figure 2 is a diagram of the series coordination control method of the transmitter system provided by the embodiment of the present invention.
  • Figure 3 is a diagram of a collaborative transmission method of the transmitter system provided by an embodiment of the present invention.
  • the present invention's high-power transient electromagnetic detection transmitter system and its control method adapted to deep ground exploration include a generator, a power frequency rectifier module, a series high-frequency DCDC module, and a generator electrically connected in sequence.
  • the generator outputs three-phase alternating current to power the entire system
  • the power frequency rectifier module is electrically connected to the generator and is used to rectify the three-phase alternating current of the generator and output direct current;
  • the series high-frequency DCDC module boosts or steps down the DC power output from the power frequency rectifier module to obtain a given reference value voltage
  • the capacitive energy storage module is used to store the electric energy output by the series high-frequency DCDC module;
  • the dummy load module is used to cooperate with the level switching of the three-level transmitting module
  • the three-level transmitting module is used to transmit three-level waveforms
  • the dummy load module and the three-level transmitting module are electrically connected with a cooperative transmitting module, and the cooperative transmitting module outputs instructions to the diodes in the dummy load module and the three-level transmitting module respectively;
  • the cooperative transmission module is connected to a timing module that provides GPS/Beidou timing.
  • the power frequency rectifier module includes an inductor electrically connected to the three-phase output end of the generator.
  • the inductor is connected to the three-phase rectifier bridge.
  • the output end of the three-phase rectifier bridge is connected in parallel with the capacitor C5 to convert the alternating current output by the generator into direct current.
  • the series high-frequency DCDC module includes several high-frequency DCDC modules.
  • the input terminals of the high-frequency DCDC module are electrically connected to both ends of the capacitor C5.
  • the output terminals of the high-frequency DCDC module are respectively connected to the corresponding capacitor energy storage module.
  • the two ends of the capacitor are electrically connected;
  • the series coordination control module is electrically connected to each high-frequency DCDC module, and is used to output instructions to the diodes in each high-frequency DCDC module.
  • the high-frequency DCDC module includes an H-bridge inverter circuit composed of four diodes and a high-frequency transformer T, a single-phase rectifier bridge, an LC filter and a capacitor C that are electrically connected to the H-bridge inverter circuit in sequence.
  • the capacitor energy storage module includes four capacitors C1, C2, C3 and C4 connected in series.
  • the false load module includes a diode clamped three-level bridge arm.
  • the three-level bridge arm is provided with four diodes VT5, VT6, VT7, and VT8 connected in series; the two ends of the three-level bridge arm are respectively Electrically connected to both ends of the capacitor energy storage module;
  • connection midpoints of the two diodes VT5 and VT6 and the connection midpoints of the two diodes VT7 and VT8 are respectively connected to the connection midpoints of the capacitors C2 and C3 in the capacitor energy storage module.
  • the connection midpoints of the two diodes VT6 and VT7 are connected to the three power
  • a resistive load is connected between the lower ends of the flat bridge arms.
  • the three-level transmitting module includes an H-bridge structure composed of two diode-clamped three-level bridge arms.
  • the upper and lower ends of the two three-level bridge arms are electrically connected to the upper and lower ends of the dummy load module respectively;
  • the three-level bridge arm on the left has four diodes VT9, VT10, VT11, and VT12 connected in series;
  • the three-level bridge arm on the right has four diodes VT13, VT14, VT15, and VT16 connected in series;
  • connection midpoints of diodes VT9 and VT10, the connection midpoints of diodes VT11 and VT12, the connection midpoints of diodes VT13 and VT14, the connection midpoints of diodes VT15 and VT16 are respectively the connection midpoints of capacitors C2 and C3 in the capacitor energy storage module.
  • the connection midpoints of diodes VT10 and VT11 are connected to electrode plate A
  • the midpoints of diodes VT14 and VT15 are connected to electrode plate B
  • electrode plate A and electrode plate B are connected to ground respectively.
  • the present invention also provides a control method for an electromagnetic detection transmitter system adapted to deep ground exploration.
  • the system is equipped with four high-frequency DCDC modules and includes the following steps:
  • Step A1 Collect the voltages V dc1 , V dc2 , V dc3 , V dc4 and the current values I dc1 , I dc2 , I dc3 , and I dc4 of the output terminals of the four high-frequency DCDC modules respectively; proceed to step A2;
  • Step A2 Add the voltages V dc1 , V dc2 , V dc3 , and V dc4 at the output terminals of the four high-frequency DCDC modules.
  • Step A3 Set the given reference value voltage The value minus the sum voltage V dc of the output terminals of the four high-frequency DCDC modules, that is, the error Then input the error value e 1 into the PI regulator to obtain the current given value Go to step A4;
  • Step A5 Compare the difference obtained after step A4 and the current given value obtained after PI adjustment Do and calculate, i.e. Go to step A7;
  • Step A6 Calculate the average voltage of the output voltages of the four high-frequency DCDC modules, and then make the difference with the voltage of each module, that is And perform P adjustment on each high-frequency DCDC module to obtain the deviation values ⁇ D 1 , ⁇ D 2 , ⁇ D 3 and ⁇ D 4 of the four high-frequency DCDC modules respectively; enter step A7;
  • the triangular wave B i is different from the triangular wave period by T/4 to realize carrier phase shift modulation and generate four high-frequency DCDC modules.
  • the switching signal S i therefore controls the voltage V dci and current I outi generated by the high-frequency DCDC module i.
  • the present invention also provides a collaborative launch method for an electromagnetic detection transmitter system adapted to deep ground exploration, which includes the following steps:
  • Step B1 Receive timing module information; enter step B2;
  • Step B2 Determine whether the timing module information reaches the transmission time, otherwise return to step B1, if not, enter step B3;
  • Step B3 Turn on the switching tubes VT 10 , VT 11 , VT 14 and VT 15 so that the three-level transmitting module outputs zero voltage; enter step B4;
  • Step B4 Turn on the switching tubes VT 5 and VT 6 , and connect the dummy load; proceed to step B5;
  • Step B5 After time Ts1, turn on the switching tubes VT 9 , VT 10 , VT 15 and VT 16 so that the three-level transmitting module outputs a positive voltage; enter step B6;
  • Step B6 Turn on the switching tubes VT 6 and VT 7. At this time, the dummy load is in a zero voltage state; enter step B7;
  • Step B7 After time Ts3, turn off the switching tubes VT 6 and VT 7 and cut out the dummy load; enter step B8;
  • Step B8 After time Ts2, turn on the switching tubes VT 10 , VT 11 , VT 14 and VT 15 so that the three-level transmitting module outputs zero voltage; enter step B9;
  • Step B9 Turn on the switching tubes VT 6 and VT 7. At this time, the false load is zero voltage; enter step B10;
  • Step B10 After time Ts3, turn on the switching tubes VT 5 and VT 6 , and connect the dummy load; enter step B11;
  • Step B11 After time Ts1, turn on the switching tubes VT 11 , VT 12 , VT 13 and VT 14 , so that the three-level transmitting module outputs a negative voltage; enter step B12;
  • Step B12 Turn on the switching tubes VT 6 and VT 7 , and false load zero voltage; proceed to step B13;
  • Step B13 After time Ts3, turn off the switching tubes VT 6 and VT 7 , and cut out the dummy load; enter step B14;
  • Step B14 Choose whether to enter the next cycle; if so, return to step B3, otherwise end the program.

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Abstract

本发明公开一种适应深地探测的电磁探测发射机系统及其控制方法，系统中工频整流模块将发电机发出的交流电整流为直流电。串联协调控制模块控制串联高频DCDC模块，将整流得到的直流电转换并跟随给定参考值电压，并与电容储能模块、假负载模块一同抑制电压波动。协同发射模块从授时模块获得GPS/北斗授时，控制假负载模块与三电平发射模块在指令时刻切换工作。三电平发射模块消除传统多电平发射电路的台阶时间，提高动态响应速度，串联协调控制模块、电容储能模块、假负载模块及协同发射模块共同工作，减少了发射电压暂态波动，提高了发射波形的频率。

Description

一种适应深地探测的电磁探测发射机系统及其控制方法 技术领域
本发明涉及电磁探测发射机系统领域，具体涉及一种适应深地探测的电磁探测发射机系统及其控制方法。
背景技术
当前全球资源开发已经由地球浅表层向更深处进行，需要对更深地层进行地质探测。常用的探测方法主要有物理探测法、化学探测法和遥感技术。在所有探测方法中，最常用的是物理探测法，电磁勘探法是物理探测法的常用方法。电磁法勘探法可以根据其响应的类型，可分为时域电磁法与频域电磁法。
目前工程上应用的电磁发射机主要分为两大类，第一类是采用低压蓄电池，通过升压电路将电压升高，使得发射机输出电压达到上百伏，这类发射机属于中小功率类型的发射机。这种发射机功率小，不适合深地探测。用于深地探测的发射机需要上千伏电压，并有较大功率输出能力，一般采用多电平发射电路。由于大功率发射机需要快速而巨大的能量切换以产生较强的大地电磁感应，传统大功率发射机，多电平切换需要台阶时间，切换速度慢。快速而巨大的能量切换使得发射机电压波动大，稳定时间长，造成发射波形变形，输出高频信号能力差，一次干扰大，电磁探测精度不高，很难实现对深地弱信号探测。
因此需要一种适应深地探测的具有高动态响应能力、能快速抑制发射电压暂态波动、能提高发射波形频率的大功率发射机系统。
发明内容
针对上述存在的技术不足，本发明的目的是提供一种适应深地探测的电磁探测发射机系统及其控制方法，起具有高动态响应能力、能快速抑制发射电压暂态波动、能提高发射波形频率的大功率发射机系统。
为解决上述技术问题，本发明采用如下技术方案：
本发明提供一种适应深地探测的电磁探测发射机系统及其控制方法，包括依次电性连接的发电机、工频整流模块、串联高频DCDC模块、电容储能模块、假负载模块以及三电平发射模；
所述发电机输出三相交流电用于给整个系统供电；
所述工频整流模块电性连接发电机，用于将发电机的三相交流电进行整流并输出直流电；
所述串联高频DCDC模块在其连接的串联协调控制模块的控制下，将工频整流模块输出的直流电进行升压或者降压处理，得到给定参考值电压；
所述电容储能模块用于存储串联高频DCDC模块输出的电能；
所述假负载模块用于配合三电平发射模块电平切换；
所述三电平发射模块用于发射三电平波形；
假负载模块和三电平发射模块电性连接有协同发射模块，协同发射模块向假负载模块和三电平发射模块中的二极管分别输出指令；
所述协同发射模块连接有向其提供GPS/北斗授时的授时模块。
优选地，所述工频整流模块包括与发电机三相输出端电性连接的电感，电感连接三相整流桥，三相整流桥输出端并联电容C5，将发电机输出交流电转换为直流电。
优选地，所述串联高频DCDC模块包括若干个高频DCDC模块，所述高频DCDC模块输入端分别电性连接电容C5两端，所述高频DCDC模块的输出端分别与对应的电容储能模块中电容的两端电性连接；
所述串联协调控制模块分别与各个高频DCDC模块电性连接，用于向各个高频DCDC模块中的二极管分别输出指令。
优选地，所述高频DCDC模块包括由四个二极管组成的H桥逆变电路以及与H桥逆变电路依次电性相连的高频变压器T、单相整流桥、LC滤波器以及电容C。
优选地，所述电容存能模块包括四个串联在一起的电容C1、C2、C3以及C4。
优选地，所述假负载模块包括二极管钳位型三电平桥臂，所述三电平桥臂设有VT5、VT6、VT7、VT8四个串联在一起的二极管；所述三电平桥臂两端分别与电容存能模块的两端电性连接；
VT5、VT6两个二极管的连接中点以及VT7、VT8两个二极管的连接中点分别与电容存能模块中电容C2、C3连接中点相连，VT6、VT7两个二极管的连接中点与三电平桥臂下端之间连接有电阻负载。
优选地，所述三电平发射模块包括由两个二极管钳位型三电平桥臂组成的H桥结构，
两个三电平桥臂的上下两端分别与假负载模块的上下两端电性连接；
左侧的三电平桥臂设四个串联在一起的二极管VT9、VT10、VT11、VT12；
右侧的三电平桥臂设四个串联在一起的二极管VT13、VT14、VT15、VT16；
二极管VT9与VT10的连接中点、二极管VT11与VT12的连接中点、二极管VT13与VT14的连接中点、二极管VT15与VT16的连接中点分别与电容存能模块中电容C2、C3的连接中点相连，二极管VT10、VT11的连接中点连接电极板A，二极管VT14、VT15的连接中点连接电极板B，电极板A、电极板B分别接地连接。
本发明还提供一种适应深地探测的电磁探测发射机系统的控制方法，该系统设置四个高频DCDC模块，包括如下步骤：
步骤A1：分别采集4个高频DCDC模块输出端的电压V dc1、V dc2、V dc3、V dc4与电流值I dc1、I dc2、I dc3、I dc4；
步骤A2：将V dc1、V dc2、V dc3、V dc4相加为V dc，即V dc＝V dc1+V dc2+V dc3+V dc4；
步骤A3：将给定参考值电压
Figure PCTCN2022125853-appb-000001
的值减去V dc，即误差
Figure PCTCN2022125853-appb-000002
再将误差值e 1输入PI调节器，得出电流给定值
Figure PCTCN2022125853-appb-000003
步骤A4：将4个高频DCDC模块输出端的电压和值V dc除以电阻负载的阻值，并与三电平发射电流I out做差，即：e 2＝I out-V dc/R；
步骤A5：将步骤A4得出来的差值与经PI调节后得出来的电流给定值
Figure PCTCN2022125853-appb-000004
做和计算，即
Figure PCTCN2022125853-appb-000005
步骤A6：计算4个高频DCDC模块输出端的电压的平均电压，然后分别与每一个模块电压做差，即
Figure PCTCN2022125853-appb-000006
并于每一个高频DCDC模块做P调节，分别得出4个高频DCDC模块的偏差值ΔD 1、ΔD 2、ΔD 3和ΔD 4；
步骤A7：将步骤A5得出来的和值e 3与步骤A6得出来的误差值ΔD i(i＝1，2，3，4)分别做和，即e 5i＝e 3+ΔD i(i＝1，2，3，4)；
步骤A8：将步骤A7得出来的和值e 5i与高频DCDC模块i输出的电流值I outi分别做差，即e 6i＝e 5i-I outi(i＝1，2，3，4)，经PI调节器得到控制信号D i(i＝1，2，3，4)；
步骤A9：控制信号D i(i＝1，2，3，4)分别与三角波B i比较，三角波B i分别相差T/4三角波周期，实现载波移相调制并生成4个高频DCDC模块的开关信号S i，故此控制高频DCDC模块i产生的电压V dci与电流I outi。
本发明还提供一种适应深地探测的电磁探测发射机系统的协同发射方法，包括如下步骤：
步骤B1：接收授时模块信息；
步骤B2：判断授时模块信息是否到发射时间，否则返回步骤B1，是则进入步骤B3；
步骤B3：开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；
步骤B4：开通开关管VT 5与VT 6，接入假负载；
步骤B5：在时间Ts1后开通开关管VT 9、VT 10、VT 15与VT 16，使三电平发射模块输出正电压；
步骤B6：开通开关管VT 6与VT 7，此时假负载处于零电压状态；
步骤B7：在时间Ts3后关断开关管VT 6与VT 7，切出假负载；
步骤B8：在时间Ts2后开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；
步骤B9：开通开关管VT 6与VT 7，此时假负载为零电压；
步骤B10：在时间Ts3后开通开关管VT 5与VT 6，假负载接入；
步骤B11：在时间Ts1后开通开关管VT 11、VT 12、VT 13与VT 14，使三电平发射模块输出负电压；
步骤B12：开通开关管VT 6与VT 7，假负载零电压；
步骤B13：在时间Ts3后关断开关管VT 6与VT 7，假负载切出；
步骤B14：选择是否进入下一个周期；是则返回步骤B3，否则结束程序。
本发明的有益效果在于，相比于传统的大功率发射机系统，本方案采用三电平发射模块，消除了传统多电平发射电路的台阶时间，提高了动态响应速度，采用串联协调控制模块、电容储能模块、假负载模块及协同发射模块共同工作，减少了发射电压暂态波动，提高了发射波形的频率。该发射机系统采用模块化结构，还可以大大减少了体积、重量，有利于野外运输。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种适应深地探测的电磁探测发射机系统的电路连接图；
图2为本发明实施例提供的发射机系统的串联协调控制方法图；
图3为本发明实施例提供的发射机系统的协同发射方法图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，本发明的一种适应深地探测的大功率瞬变电磁探测发射机系统及其控制方 法，包括依次电性连接的发电机、工频整流模块、串联高频DCDC模块、电容储能模块、假负载模块以及三电平发射模；
所述发电机输出三相交流电用于给整个系统供电；
所述工频整流模块电性连接发电机，用于将发电机的三相交流电进行整流并输出直流电；
所述串联高频DCDC模块在其连接的串联协调控制模块的控制下，将工频整流模块输出的直流电进行升压或者降压处理，得到给定参考值电压；
所述电容储能模块用于存储串联高频DCDC模块输出的电能；
所述假负载模块用于配合三电平发射模块电平切换；
所述三电平发射模块用于发射三电平波形；
假负载模块和三电平发射模块电性连接有协同发射模块，协同发射模块向假负载模块和三电平发射模块中的二极管分别输出指令；
所述协同发射模块连接有向其提供GPS/北斗授时的授时模块。
所述工频整流模块包括与发电机三相输出端电性连接的电感，电感连接三相整流桥，三相整流桥输出端并联电容C5，将发电机输出交流电转换为直流电。
所述串联高频DCDC模块包括若干个高频DCDC模块，所述高频DCDC模块输入端分别电性连接电容C5两端，所述高频DCDC模块的输出端分别与对应的电容储能模块中电容的两端电性连接；
所述串联协调控制模块分别与各个高频DCDC模块电性连接，用于向各个高频DCDC模块中的二极管分别输出指令。
所述高频DCDC模块包括由四个二极管组成的H桥逆变电路以及与H桥逆变电路依次电性相连的高频变压器T、单相整流桥、LC滤波器以及电容C。
所述电容存能模块包括四个串联在一起的电容C1、C2、C3以及C4。
所述假负载模块包括二极管钳位型三电平桥臂，所述三电平桥臂设有VT5、VT6、VT7、VT8四个串联在一起的二极管；所述三电平桥臂两端分别与电容存能模块的两端电性连接；
VT5、VT6两个二极管的连接中点以及VT7、VT8两个二极管的连接中点分别与电容存能模块中电容C2、C3连接中点相连，VT6、VT7两个二极管的连接中点与三电平桥臂下端之间连接有电阻负载。
所述三电平发射模块包括由两个二极管钳位型三电平桥臂组成的H桥结构，
两个三电平桥臂的上下两端分别与假负载模块的上下两端电性连接；
左侧的三电平桥臂设四个串联在一起的二极管VT9、VT10、VT11、VT12；
右侧的三电平桥臂设四个串联在一起的二极管VT13、VT14、VT15、VT16；
二极管VT9与VT10的连接中点、二极管VT11与VT12的连接中点、二极管VT13与VT14的连接中点、二极管VT15与VT16的连接中点分别与电容存能模块中电容C2、C3的连接中点相连，二极管VT10、VT11的连接中点连接电极板A，二极管VT14、VT15的连接中点连接电极板B，电极板A、电极板B分别接地连接。
参见图2，本发明还提供一种适应深地探测的电磁探测发射机系统的控制方法，该系统设置四个高频DCDC模块，包括如下步骤：
步骤A1：分别采集4个高频DCDC模块输出端的电压V dc1、V dc2、V dc3、V dc4与电流值I dc1、I dc2、I dc3、I dc4；进入步骤A2；
步骤A2：将4个高频DCDC模块输出端的电压V dc1、V dc2、V dc3、V dc4相加，其和为V dc，即V dc＝V dc1+V dc2+V dc3+V dc4；进入步骤A3；
步骤A3：将给定参考值电压
Figure PCTCN2022125853-appb-000007
的值减去4个高频DCDC模块输出端的和值电压V dc，即误差
Figure PCTCN2022125853-appb-000008
再将误差值e 1输入PI调节器，得出电流给定值
Figure PCTCN2022125853-appb-000009
进入步骤A4；
步骤A4：将4个高频DCDC模块输出端的电压和值V dc除以电阻负载的阻值，并与三电平发射电流I out做差，即：e 2＝I out-V dc/R；进入步骤A5；
步骤A5：将经步骤A4后得出来的差值与经PI调节后得出来的电流给定值
Figure PCTCN2022125853-appb-000010
做和计算，即
Figure PCTCN2022125853-appb-000011
进入步骤A7；
步骤A6：计算4个高频DCDC模块输出端的电压的平均电压，然后分别与每一个模块电压做差，即
Figure PCTCN2022125853-appb-000012
并于每一个高频DCDC模块做P调节，得出分别4个高频DCDC模块的偏差值ΔD 1、ΔD 2、ΔD 3和ΔD 4；进入步骤A7；
步骤A7：将经步骤A5后得出来的和值e 3与经步骤A6后得出来的误差值ΔD i(i＝1，2，3，4)分别做和，即e 5i＝e 3+ΔD i(i＝1，2，3，4)；进入步骤A8；
步骤A8：将经步骤A7后得出来的和值e 5i与高频DCDC模块i输出的电流值I outi分别做差，即e 6i＝e 5i-I outi(i＝1，2，3，4)，经PI调节器得到控制信号D i(i＝1，2，3，4)；进入步骤A9
步骤A9：控制信号D i(i＝1，2，3，4)分别与三角波B i比较，三角波B i分别相差T/4三角波周期，实现载波移相调制并生成4个高频DCDC模块的开关信号S i，故此控制高频DCDC模块i产生的电压V dci与电流I outi。
参见图3，本发明还提供一种适应深地探测的电磁探测发射机系统的协同发射方法，包 括如下步骤：
步骤B1：接收授时模块信息；进入步骤B2；
步骤B2：判断授时模块信息是否到发射时间，否则返回步骤B1，是则进入步骤B3；
步骤B3：开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；进入步骤B4；
步骤B4：开通开关管VT 5与VT 6，接入假负载；进入步骤B5；
步骤B5：在时间Ts1后开通开关管VT 9、VT 10、VT 15与VT 16，使三电平发射模块输出正电压；进入步骤B6；
步骤B6：开通开关管VT 6与VT 7，此时假负载处于零电压状态；进入步骤B7；
步骤B7：在时间Ts3后关断开关管VT 6与VT 7，切出假负载；进入步骤B8；
步骤B8：在时间Ts2后开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；进入步骤B9；
步骤B9：开通开关管VT 6与VT 7，此时假负载为零电压；进入步骤B10；
步骤B10：在时间Ts3后开通开关管VT 5与VT 6，假负载接入；进入步骤B11；
步骤B11：在时间Ts1后开通开关管VT 11、VT 12、VT 13与VT 14，使三电平发射模块输出负电压；进入步骤B12；
步骤B12：开通开关管VT 6与VT 7，假负载零电压；进入步骤B13；
步骤B13：在时间Ts3后关断开关管VT 6与VT 7，假负载切出；进入步骤B14；
步骤B14：选择是否进入下一个周期；是则返回步骤B3，否则结束程序。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。
。

Claims (9)

  1. 一种适应深地探测的电磁探测发射机系统，其特征在于，包括依次电性连接的发电机、工频整流模块、串联高频DCDC模块、电容储能模块、假负载模块以及三电平发射模块；
    所述发电机输出三相交流电用于给整个系统供电；
    所述工频整流模块电性连接发电机，用于将发电机的三相交流电进行整流并输出直流电；
    所述串联高频DCDC模块在其连接的串联协调控制模块的控制下，将工频整流模块输出的直流电进行升压或者降压处理，得到给定参考值电压；
    所述电容储能模块用于存储串联高频DCDC模块输出的电能；
    所述假负载模块用于配合三电平发射模块电平切换；
    所述三电平发射模块用于发射三电平波形；
    假负载模块和三电平发射模块电性连接有协同发射模块，协同发射模块向假负载模块和三电平发射模块中的二极管分别输出指令；
    所述协同发射模块连接有向其提供GPS/北斗授时的授时模块。
  2. 如权利要求1所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述工频整流模块包括与发电机三相输出端电性连接的电感，电感连接三相整流桥，三相整流桥输出端并联电容C5，将发电机输出交流电转换为直流电。
  3. 如权利要求2所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述串联高频DCDC模块包括若干个高频DCDC模块，所述高频DCDC模块输入端分别电性连接电容C5两端，所述高频DCDC模块的输出端分别与对应的电容储能模块中电容的两端电性连接；
    所述串联协调控制模块分别与各个高频DCDC模块电性连接，用于向各个高频DCDC模块中的二极管分别输出指令。
  4. 如权利要求3所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述高频DCDC模块包括由四个二极管组成的H桥逆变电路以及与H桥逆变电路依次电性相连的高频变压器T、单相整流桥、LC滤波器以及电容C。
  5. 如权利要求4所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述电容存能模块包括四个串联在一起的电容C1、C2、C3以及C4。
  6. 如权利要求5所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述假负载模块包括二极管钳位型三电平桥臂，所述三电平桥臂设有VT5、VT6、VT7、VT8四个串联在一起的二极管；所述三电平桥臂两端分别与电容存能模块的两端电性连接；
    VT5、VT6两个二极管的连接中点以及VT7、VT8两个二极管的连接中点分别与电容 存能模块中电容C2、C3连接中点相连，VT6、VT7两个二极管的连接中点与三电平桥臂下端之间连接有电阻负载。
  7. 如权利要求6所述的一种适应深地探测的电磁探测发射机系统，其特征在于，所述三电平发射模块包括由两个二极管钳位型三电平桥臂组成的H桥结构，
    两个三电平桥臂的上下两端分别与假负载模块的上下两端电性连接；
    左侧的三电平桥臂设四个串联在一起的二极管VT9、VT10、VT11、VT12；
    右侧的三电平桥臂设四个串联在一起的二极管VT13、VT14、VT15、VT16；
    二极管VT9与VT10的连接中点、二极管VT11与VT12的连接中点、二极管VT13与VT14的连接中点、二极管VT15与VT16的连接中点分别与电容存能模块中电容C2、C3的连接中点相连，二极管VT10、VT11的连接中点连接电极板A，二极管VT14、VT15的连接中点连接电极板B，电极板A、电极板B分别接地连接。
  8. 如权利要求7所述的一种适应深地探测的电磁探测发射机系统的控制方法，该系统设置四个高频DCDC模块，其特征在于，包括如下步骤：
    步骤A1：分别采集4个高频DCDC模块输出端的电压V dc1、V dc2、V dc3、V dc4与电流值I dc1、I dc2、I dc3、I dc4；
    步骤A2：将V dc1、V dc2、V dc3、V dc4相加为V dc，即V dc＝V dc1+V dc2+V dc3+V dc4；
    步骤A3：将给定参考值电压
    Figure PCTCN2022125853-appb-100001
    的值减去V dc，即误差
    Figure PCTCN2022125853-appb-100002
    再将误差值e 1输入PI调节器，得出电流给定值
    Figure PCTCN2022125853-appb-100003
    步骤A4：将4个高频DCDC模块输出端的电压和值V dc除以假负载(电阻负载)的阻值，并与三电平发射电流I out做差，即：e 2＝I out-V dc/R；
    步骤A5：将步骤A4得出来的差值与经PI调节后得出来的电流给定值
    Figure PCTCN2022125853-appb-100004
    做和计算，即
    Figure PCTCN2022125853-appb-100005
    步骤A6：计算4个高频DCDC模块输出端的电压的平均电压，然后分别与每一个模块电压做差，即
    Figure PCTCN2022125853-appb-100006
    (i＝1，2，3，4)，并于每一个高频DCDC模块做P调节，分别得出4个高频DCDC模块的偏差值ΔD 1、ΔD 2、ΔD 3和ΔD 4；
    步骤A7：将步骤A5得出来的和值e 3与步骤A6得出来的误差值ΔD i(i＝1，2，3，4)分别做和，即e 5i＝e 3+ΔD i(i＝1，2，3，4)；
    步骤A8：将步骤A7得出来的和值e 5i与高频DCDC模块i输出的电流值I outi分别做差，即e 6i＝e 5i-I outi(i＝1，2，3，4)，经PI调节器得到控制信号D i(i＝1，2，3，4)；
    步骤A9：控制信号D i(i＝1，2，3，4)分别与三角波B i比较，三角波B i分别相差T/4三角波周期，实现载波移相调制并生成4个高频DCDC模块的开关信号S i，故此控制高频DCDC模块i产生的电压V dci与电流I outi。
  9. 如权利要求7所述的一种适应深地探测的电磁探测发射机系统的协同发射方法，其特征在于，包括如下步骤：
    步骤B1：接收授时模块信息；
    步骤B2：判断授时模块信息是否到发射时间，否则返回步骤B1，是则进入步骤B3；
    步骤B3：开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；
    步骤B4：开通开关管VT 5与VT 6，接入假负载；
    步骤B5：在时间Ts1后开通开关管VT 9、VT 10、VT 15与VT 16，使三电平发射模块输出正电压；
    步骤B6：开通开关管VT 6与VT 7，此时假负载处于零电压状态；
    步骤B7：在时间Ts3后关断开关管VT 6与VT 7，切出假负载；
    步骤B8：在时间Ts2后开通开关管VT 10、VT 11、VT 14与VT 15，使三电平发射模块输出零电压；
    步骤B9：开通开关管VT 6与VT 7，此时假负载为零电压；
    步骤B10：在时间Ts3后开通开关管VT 5与VT 6，假负载接入；
    步骤B11：在时间Ts1后开通开关管VT 11、VT 12、VT 13与VT 14，使三电平发射模块输出负电压；
    步骤B12：开通开关管VT 6与VT 7，假负载零电压；
    步骤B13：在时间Ts3后关断开关管VT 6与VT 7，假负载切出；
    步骤B14：选择是否进入下一个周期；是则返回步骤B3，否则结束程序。
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