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CN109256837B - Ground magnetic resonance multi-stage regulation and control rapid high-precision charging device and charging control method - Google Patents

Ground magnetic resonance multi-stage regulation and control rapid high-precision charging device and charging control method Download PDF

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CN109256837B
CN109256837B CN201811266815.9A CN201811266815A CN109256837B CN 109256837 B CN109256837 B CN 109256837B CN 201811266815 A CN201811266815 A CN 201811266815A CN 109256837 B CN109256837 B CN 109256837B
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charging
difference
module
energy storage
storage capacitor
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CN109256837A (en
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张洋
李苏杭
陈思博
孙德立
林婷婷
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Jilin University
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Jilin University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices

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Abstract

本发明属于地球物理勘探设备领域，涉及一种地面磁共振多级调控快速高精度充电装置及充电控制方法，通过主控模块根据预充电电压与实际电压之间的差值控制并从并联的DC‑DC变换器模块选择多个DC‑DC变换器模块以恒流模式对储能电容进行快速充电，根据所述差值的降低逐级对DC‑DC变换器模块进行软关断，然后根据所述差值控制最后一个未被软关断的DC‑DC变换器模块以对恒压模式对储能电容进行充电；或根据预充电电压与所述实际电压之间的差值控制一个能够实现恒压模式与恒流模式切换的DC‑DC变换器模块以对恒压模式对储能电容进行充电。采用多路并联的DC/DC变换模块为储能电容充电，并先通过多级恒流充电，再采用单级恒压的充电模式，有效提高了该充电装置的充电速度和精度。

Figure 201811266815

The invention belongs to the field of geophysical exploration equipment, and relates to a ground magnetic resonance multi-level regulation fast and high-precision charging device and a charging control method. The DC-DC converter module selects multiple DC-DC converter modules to rapidly charge the energy storage capacitors in constant current mode, softly turns off the DC-DC converter modules step by step according to the reduction of the difference, and then The difference value controls the last DC-DC converter module that is not turned off softly to charge the energy storage capacitor in constant voltage mode; The DC-DC converter module that switches between the voltage mode and the constant current mode is used to charge the energy storage capacitor in the constant voltage mode. A multi-channel parallel DC/DC conversion module is used to charge the energy storage capacitor, and the multi-stage constant current charging is used first, and then the single-stage constant voltage charging mode is adopted, which effectively improves the charging speed and accuracy of the charging device.

Figure 201811266815

Description

Ground magnetic resonance multi-stage regulation and control rapid high-precision charging device and charging control method
Technical Field
The invention relates to the field of geophysical exploration equipment, in particular to a ground magnetic resonance multi-stage regulation and control quick high-precision charging device and a charging control method.
Background
The surface Magnetic Resonance (MRS) technology is a new non-invasive geophysical method that can detect groundwater directly, and is widely used in groundwater detection at a depth of 0 to 150 m. When the nuclear magnetic resonance water detecting system detects underground water, the method comprises three processes of charging an energy storage capacitor, transmitting current and collecting signals. The energy storage capacitor provides energy and power for instant high-power pulse current emission, a high-voltage-withstanding and large-capacity capacitor (450V and 22000uF) is generally adopted, and the working efficiency of the ground magnetic resonance system is greatly influenced by charging time. In addition, the charging voltage of the energy storage capacitor determines the detection depth, and the voltage precision determines the detection effect and the inversion precision. Therefore, the charging speed and the charging precision of the energy storage capacitor seriously affect the working efficiency and the detection effect of the ground magnetic resonance system.
The invention discloses a constant-current charging and discharging power supply device of a nuclear magnetic resonance water detector based on a network, which adopts a low-power constant-current charging mode, has the following defects although the design is simple and the control is convenient: (1) when the charging reaches a preset value, the phenomenon of over-charging or under-charging is easily caused due to large current during turn-off, and the charging precision cannot be ensured; (2) when charging is finished, the charging power supply is forcibly turned off, the charging module can generate spike pulse to damage the device, and the service life of the charging module is shortened.
The invention discloses a nuclear magnetic resonance water detection emission device based on array inversion charging and a working method. However, the device still has the problems of overcharge or undercharge, and damage to the charging system caused by spikes due to hard shutdown.
The charging device and the charging method of the ground magnetic resonance water detecting system in the related technology have the problems of low charging precision and damage to the charging system caused by hard turn-off.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a ground magnetic resonance multi-stage regulation and control quick high-precision charging device on the one hand and a ground magnetic resonance multi-stage regulation and control quick charging control method on the other hand.
The invention is realized in this way, a kind of ground magnetic resonance multi-stage regulation and control quick high-precision charging device, the device includes:
the main control module receives pre-charging voltage of an energy storage capacitor and actual voltage of the energy storage capacitor sent by an upper computer, controls and selects a plurality of DC-DC converter modules from the DC-DC converter modules connected in parallel to rapidly charge the energy storage capacitor in a constant current mode according to difference between the pre-charging voltage and the actual voltage, performs soft shutdown on the DC-DC converter modules step by step according to reduction of the difference, and controls the last DC-DC converter module which is not subjected to soft shutdown according to the difference to charge the energy storage capacitor in a constant voltage mode; or
And controlling a DC-DC converter module capable of realizing switching between a constant voltage mode and a constant current mode according to the difference value between the pre-charging voltage and the actual voltage so as to charge the energy storage capacitor in the constant voltage mode.
Further, the DC-DC converter module includes:
the DC-DC converter module works in the constant current mode, is controlled by the main control module and charges the energy storage capacitor;
the DC-DC converter module is switched between a constant current mode and a constant voltage mode, and is switched between the constant current mode and the constant voltage mode under the control of the main control module to charge the energy storage capacitor;
the main control module acquires the output voltage of the DC-DC converter module switched between the constant current mode and the constant voltage mode, and switches the working mode of the DC-DC converter module switched between the constant current mode and the constant voltage mode according to the output voltage.
Furthermore, the device also comprises an H-bridge chopping module connected with the transmitting coil, and the H-bridge chopping module and the transmitting coil are controlled to discharge or charge the energy storage capacitor through the main control module according to the difference value between the pre-charging voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor.
Further, a current sampling and anti-reverse charging module is arranged between the DC-DC converter module and the energy storage capacitor, the current sampling and anti-reverse charging module detects an output current of the DC-DC converter module and feeds the output current back to the DC-DC converter module through a current feedback module, and the current sampling and anti-reverse charging module includes: a resistor RSThe input end of the reverse charging prevention module is connected with the current sampling and reverse charging prevention module to serve as a current sampling resistor which is connected with a current feedback loop, and the current sampling resistor is connected with the resistor RSA diode D connected in series to output the voltage, a resistor RLResidual energy is absorbed during soft shutdown of the DC-DC converter after connection to the input.
Further, the main control module gradually reduces the PWM duty ratio of the DC-DC converter module to zero by controlling, and the soft turn-off is realized by reducing the step length by 5% in each switching period.
Further, the output voltage V of the DC-DC converter module1＝I*RS+VD+V0I is the output current of the DC-DC converter module, VDIs the forward conduction voltage, V, of the diode D in the current sampling and anti-reverse charging module0Is the actual voltage of the energy storage capacitor; the switching condition of the constant current mode and the constant voltage mode is V1＝ VD+VC，VCFor pre-charging voltage value, at the time of switching, the output current is still the current value of constant current mode, then gradually decreases, when the current decreases to approximately 0A, V0Is approximately equal to the pre-charge voltage VCAnd the charging is completed.
Further, the device comprises a first voltage detection module and a second voltage detection module which are respectively used for detecting the output voltage of the DC-DC converter module and the actual voltage of the energy storage capacitor, wherein the output voltage of the DC-DC converter module can realize the switching between the constant voltage mode and the constant current mode.
A ground magnetic resonance multi-stage regulation and control quick charging control method comprises the following steps: controlling and selecting a plurality of DC-DC converter modules from the parallel DC-DC converter modules according to the difference between the pre-charging voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor to rapidly charge the energy storage capacitor in a constant current mode, gradually performing soft turn-off on the DC-DC converter modules according to the reduction of the difference, and controlling at least one DC-DC converter module which is not subjected to soft turn-off according to the difference to charge the energy storage capacitor in a constant voltage mode; or
And controlling at least one DC-DC converter module capable of realizing the switching between the constant voltage mode and the constant current mode according to the difference value between the pre-charging voltage and the actual voltage so as to charge the energy storage capacitor in the constant voltage mode.
Further, before the charging mode is selected, whether the difference value is larger than a preset charging critical value V is judgedr0；
When the difference is less than or equal to the preset charging critical value Vr0When the difference value is judged, the H-bridge chopping module is controlled to enable the energy storage capacitor to discharge through the transmitting coil and then return to the judgment of the difference value;
when the difference is larger than the preset charging critical value Vr0Then, whether the difference value is less than or equal to a preset one-way charging critical value V is judgedr1；
When the difference is larger than the one-way charging critical value Vr1Then, whether the difference value is less than or equal to two paths of charging critical values V is judgedr2；
When the difference value is larger than two paths of charging critical values Vr2Continuously judging whether the difference value is less than or equal to n charging critical values Vrn；
When the difference is larger than n charging critical values VrnAnd controlling the n paths of parallel DC-DC converter modules to charge the energy storage capacitor in a constant current mode.
Further, the step-by-step soft shutdown of the DC-DC converter module according to the reduction of the difference includes: judging whether the difference value is equal to the n-1 charging critical value Vrn-1When the difference is equal to n-1 charging threshold value Vrn-1When the energy storage capacitor is charged, controlling the DC-DC converter module of the nth path to perform soft turn-off, and sequentially performing soft turn-off until the rest DC-DC converter module charges the energy storage capacitor in a constant current mode; judging whether a switching condition of a constant current mode and a constant voltage mode is reached; and when the switching condition is met, controlling the last DC-DC converter module to charge the energy storage capacitor in a constant voltage mode.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the ground magnetic resonance multi-stage regulation and control rapid high-precision charging device and the charging control method, the energy storage capacitor is charged by adopting the multi-path parallel DC/DC conversion module, multi-stage constant current charging is firstly carried out, and then a single-stage constant voltage charging mode is adopted, so that the advantages of high multi-stage parallel constant current charging speed and high constant voltage charging precision are fully utilized, and the charging speed and the charging precision of the charging device are effectively improved;
(2) according to the multi-stage regulation and control rapid high-precision charging device and the charging control method, a multi-stage regulation and control algorithm is adopted to combine the difference value of the pre-charging voltage and the voltage of the energy storage capacitor, the charging mode and the charging mode are adaptively regulated, multi-stage parallel charging is adopted for large voltage difference, single-stage charging is adopted for small voltage difference, and the charging speed and precision of the charging device are further improved;
(3) according to the multi-stage regulation and control quick high-precision charging device and the charging control method, the stability and the service life of the charging device are ensured through a soft turn-off mode of multi-stage regulation and control; and the reliability, the charging speed and the precision of the charging device are further improved through a reasonable switching mode from constant current to constant voltage.
Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 shows a schematic block diagram of a multi-stage regulated fast high precision charging apparatus of one embodiment of the present invention;
FIG. 2 illustrates a current sampling and anti-reverse charging module circuit diagram of one embodiment of the present invention;
fig. 3 shows a schematic flow diagram of a charge control method of an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A ground magnetic resonance multi-level regulation and control quick high-precision charging device comprises:
the main control module receives pre-charging voltage of an energy storage capacitor and actual voltage of the energy storage capacitor sent by an upper computer, controls and selects a plurality of DC-DC converter modules from the DC-DC converter modules connected in parallel to rapidly charge the energy storage capacitor in a constant current mode according to difference between the pre-charging voltage and the actual voltage, then gradually performs soft shutdown on the DC-DC converter modules according to reduction of the difference, and finally controls the last DC-DC converter module which is not soft shutdown according to the difference to charge the energy storage capacitor in a constant voltage mode; or
And controlling a DC-DC converter module capable of switching between a constant current mode and a constant voltage mode according to the difference value between the pre-charging voltage and the actual voltage so as to charge an energy storage capacitor in the constant voltage mode.
The plurality of DC-DC converter modules rapidly charge the energy storage capacitor in a constant current mode, when the last DC-DC converter module which is not in soft shutdown charges the energy storage capacitor in the constant current mode,
the DC-DC converter module includes: the DC-DC converter module works in the constant current mode, is controlled by the main control module and charges the energy storage capacitor; the last DC-DC converter module that is not soft-switched off needs to be controlled to switch modes according to the difference value to charge the energy storage capacitor in the constant voltage mode. The invention also discloses a DC-DC converter module capable of switching between the constant voltage mode and the constant current mode, which can meet the requirement, but is not limited to one.
The main control module acquires the output voltage of the DC-DC converter module switched between the constant current mode and the constant voltage mode, and switches the working mode of the DC-DC converter module switched between the constant current mode and the constant voltage mode according to the output voltage.
And simultaneously, the device also comprises an H-bridge chopping module connected with the transmitting coil, and the H-bridge chopping module and the transmitting coil are controlled to discharge or charge the energy storage capacitor through the main control module according to the difference value between the pre-charging voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor.
Referring to fig. 1, a schematic block diagram of a multi-level regulated fast high-precision charging apparatus of an embodiment of the present invention is shown; taking three routes as an example, the device is used for a nuclear magnetic resonance water detection system, and the multistage regulation and control quick high-precision charging device comprises: PC (host computer), host control module (adopt DSP + FPGA host control module), three parallelly connected DC/DC conversion module (be first DC/DC conversion module, second DC/DC conversion module, third DC/DC conversion module respectively), three routes current feedback module and current sampling and anti-reverse charging module that correspond, energy storage capacitor, first voltage detection module, second voltage detection module, H bridge chopper module, transmitting coil, every DC/DC conversion module includes: the DC/DC conversion module adopts the existing structure to realize the function and the connection relation, which are not repeated one by one.
Wherein, a PC 1 is respectively connected with a first DC-DC converter module 3, a second DC-DC converter module 6 and a third DC-DC converter module 9 through a DSP + FPGA main control module 2 on a connection relation, the first DC-DC converter module 3 is connected with an anti-reverse charging module 4 and a first current feedback module 5 through a first current sampling circuit, the first current feedback module 5 is connected with the first DC-DC converter module 3, the second DC-DC converter module 6 is connected with an anti-reverse charging module 7 and a second current feedback module 8 through a second current sampling circuit, the second current feedback module 8 is connected with the second DC-DC converter module 6, the third DC-DC converter module 9 is connected with an anti-reverse charging module 10 and a third current feedback module 11 through a third current sampling circuit, the third current feedback module 11 is connected with the third DC-DC converter module 9, the third DC-DC converter module 9 is connected with the DSP + FPGA main control module 2 through the first voltage detection module 12, the first current sampling circuit and the reverse charging prevention module 4, the second current sampling circuit and the reverse charging prevention module 7, the third current sampling circuit and the reverse charging prevention module 10 are respectively connected with the energy storage capacitor 13, the energy storage capacitor 13 is connected with the DSP + FPGA main control module 2 through the second voltage detection module 16, the energy storage capacitor 13 is connected with the transmitting coil 15 through the H-bridge chopping module 14, and the DSP + FPGA main control module 2 is connected with the H-bridge chopping module 14.
As shown in fig. 2, the current sampling and anti-reverse charging module 4, the current sampling and anti-reverse charging module 7 and the current sampling and anti-reverse charging module 10 have the same circuit structure, the resistor RS is used as a current sampling resistor to be connected with a current feedback loop, the diode D prevents reverse charging, and the resistor RL can absorb residual energy during the soft turn-off period of the converter.
The system comprises a PC 1 and a FPGA main control module 2, wherein the PC 1 comprises an upper computer for man-machine interaction, and a worker sends a charging instruction to the DSP + FPGA main control module 2 through the PC 1 and displays charging state information collected by the DSP + FPGA main control module 2;
the DSP + FPGA main control module 2 interacts with an upper computer, a multi-stage regulation charging algorithm is arranged on the DSP + FPGA main control module 2, and the DSP + FPGA main control module 2 is used for receiving the pre-charging voltage of the energy storage capacitor 13 sent by the upper computer and controlling the charging mode of the energy storage capacitor through the multi-stage regulation charging algorithm;
the DSP + FPGA main control module 2 is further used for charging or discharging the energy storage capacitor according to the difference value between the pre-charging voltage and the actual voltage of the energy storage capacitor 13, when the difference value is larger than 0, the DSP + FPGA main control module 2 controls the DC-DC converter module 3, the DC-DC converter module 6 and the DC-DC converter module 9 to charge the energy storage capacitor 13 in a constant current or constant voltage mode, otherwise, the DSP + FPGA main control module 2 controls the H-bridge chopper module 14 and the transmitting coil 15 to discharge;
the DSP + FPGA main control module 2 is also used for selecting and adopting a plurality of DC-DC converter modules to charge the energy storage capacitor according to the difference value between the pre-charging voltage and the actual voltage of the energy storage capacitor 13, gradually switching off the DC-DC converter modules in a soft way along with the reduction of the difference value and controlling the third DC-DC converter module 9 to switch the working modes of constant current and constant voltage;
the soft switching-off is carried out by the steps that the DSP + FPGA main control module 2 controls the PWM duty ratio of each DC-DC converter module to be gradually reduced to zero and is reduced by 5% in each switching period; after the soft shutdown is started, the output voltage of each DC-DC converter module is lower than the voltage of the energy storage capacitor, and reverse charging is prevented through a diode D; during soft turn-off, through resistance RLResidual energy in the converter module is absorbed, and soft shutdown can effectively prevent the problem that the converter module is damaged due to spike pulse caused by hard shutdown;
the first DC-DC converter module 3, the second DC-DC converter module 6 and the third DC-DC converter module 9 are three-way parallel modules, wherein the first DC-DC converter module 3 and the second DC-DC converter module 6 can only work in a constant current mode, and the third DC-DC converter module 9 can work in a constant current mode and a constant voltage mode;
the energy storage capacitor 13 is used for providing energy required by the transmitting device during transmitting;
the H-bridge chopper module 14 and the transmitting coil 15 are used for generating alternating pulses with Larmor frequency, providing conditions for realizing the generation of magnetic resonance response of underground water in a detection area, and also used for discharging an energy storage capacitor with voltage higher than pre-charging voltage in the charging device;
the first voltage detection module 12 is used for detecting the actual voltage output by the third DC-DC converter module 9 in real time and sending the actual voltage to the DSP + FPGA main control module 2;
the second voltage detection module 16 is used for detecting the actual voltage of the energy storage capacitor 13 in real time, sending the actual voltage to the DSP + FPGA main control module 2, and performing switching judgment on the constant current mode and the constant voltage mode by combining the detection value of the voltage detection module 12;
wherein the output voltage V of the third DC-DC converter module 91＝I*RS+VD+V0I is the output current of the third DC-DC converter module 9, VDIs the forward conduction voltage, V, of the diode D in the current sampling and anti-reverse charging module 100Is the actual voltage of the energy storage capacitor; the switching condition of the constant current mode and the constant voltage mode of the third DC-DC converter module 9 is V1＝VD+VC，VCFor pre-charging voltage value, at the time of switching, the output current is still the current value of constant current mode, then gradually decreases, when the current decreases to approximately 0A, V0Is approximately equal to the pre-charge voltage VCWhen the charging is finished, the switching mode can realize the stable transition from the constant current to the constant voltage, avoid the unstable condition of jumping up when the output current is switched too early, further ensure the charging precision and the charging efficiency of the energy storage capacitor, and simultaneously ensure that the third DC-DC converter module 9 is gradually switched off, thereby improving the reliability of the system;
the DSP + FPGA main control module 2 detects the output voltage V of the third DC-DC converter module 9 in real time through the first voltage detection module 121When the above conditions are met, the third DC-DC converter module 9 is controlled to change the constant-current working mode to the constant-voltage working mode;
whereinThe condition for completing charging is the actual voltage V of the energy storage capacitor0＝99.9％*VCTherefore, the charging precision can be guaranteed, the charging efficiency can be guaranteed, and the DSP + FPGA main control module 2 detects the output voltage V of the third DC-DC converter module 9 in real time through the first voltage detection module 121When the above conditions are satisfied, the third DC-DC converter module 9 is turned off;
according to the multi-stage regulation and control quick and high-precision charging device provided by the embodiment of the invention, the energy storage capacitor 13 is charged by adopting the three DC/DC converter modules which are connected in parallel, and a charging mode of firstly carrying out multi-stage constant current and then carrying out single-stage constant voltage on the energy storage capacitor 13 can be adopted, so that the advantages of high charging speed of a multi-stage constant current charging mode and high charging precision of a single-stage constant voltage charging mode are fully utilized, and the charging speed and precision of the charging device are greatly improved;
the multi-stage regulation and control quick high-precision charging device provided by the embodiment of the invention is used for carrying out multi-stage regulation and control charging by combining the difference value condition of the pre-charging voltage and the actual voltage of the energy storage capacitor, when the difference value is larger, three paths of charging devices are connected in parallel to carry out quick charging in a constant current mode, and as the difference value is reduced, the DC/DC converter module is softly turned off step by step, so that the stability and the service life of the charging device are ensured;
according to the multi-level regulation and control rapid high-precision charging device provided by the embodiment of the invention, the switching voltage for charging the energy storage capacitor module can be calculated through a multi-level regulation and control charging algorithm, the switching voltage is the switching voltage for switching the charging device from a constant-current charging mode to a constant-voltage charging mode, the system can be safely and stably switched without unstable situations such as charging current jump and sudden change, and the charging speed, precision and stability of the charging device are further improved.
As shown in fig. 3, the charging device suitable for the multi-stage regulation charging algorithm according to the above embodiment includes: controlling and selecting n DC-DC converter modules from the parallel DC-DC converter modules according to the difference between the pre-charging voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor to rapidly charge the energy storage capacitor in a constant current mode, gradually performing soft turn-off on the DC-DC converter modules according to the reduction of the difference, and controlling at least one DC-DC converter module which is not subjected to soft turn-off to charge the energy storage capacitor in a constant voltage mode according to the difference; or
And controlling a DC-DC converter module capable of realizing switching between a constant voltage mode and a constant current mode according to the difference value between the pre-charging voltage and the actual voltage so as to charge the energy storage capacitor in the constant voltage mode.
Judging whether the difference value is larger than a preset charging critical value V before selecting the charging moder0；
When the difference is less than or equal to the preset charging critical value Vr0When the difference value is judged, the H-bridge chopping module is controlled to enable the energy storage capacitor to discharge through the transmitting coil and then return to the judgment of the difference value;
when the difference is larger than the preset charging critical value Vr0Then, whether the difference value is less than or equal to a preset one-way charging critical value V is judgedr1；
When the difference is larger than the one-way charging critical value Vr1Then, whether the difference value is less than or equal to two paths of charging critical values V is judgedr2；
When the difference value is larger than two paths of charging critical values Vr2Continuously judging whether the difference value is less than or equal to n charging critical values Vrn；
When the difference is larger than n charging critical values VrnAnd controlling the n paths of parallel DC-DC converter modules to charge the energy storage capacitor in a constant current mode.
The step-by-step soft shutdown of the DC-DC converter module according to the reduction of the difference value comprises: judging whether the difference value is equal to the n-1 charging critical value Vrn-1When the difference is equal to n-1 charging threshold value Vrn-1When the energy storage capacitor is charged, controlling the DC-DC converter module of the nth path to perform soft turn-off, and sequentially performing soft turn-off until the rest DC-DC converter module charges the energy storage capacitor in a constant current mode; judging whether a switching condition of a constant current mode and a constant voltage mode is reached; and when the switching condition is met, controlling the last DC-DC converter module to charge the energy storage capacitor in a constant voltage mode.
The specific charging control method comprises the following steps of:
301, inputting a pre-charging voltage, a charging critical value, a one-way charging critical value and a two-way charging critical value to a DSP + FPGA main control module through a PC by a worker;
step 302, the DSP + FPGA main control module collects the voltage value of the energy storage capacitor in real time through a second voltage detection module and calculates the difference between the preset charging voltage and the voltage value of the energy storage capacitor;
step 303, determining whether the difference is greater than the charging threshold Vr0(ii) a When the difference is less than or equal to the charging critical value Vr0Then, go to step 304; when the difference is larger than the charging critical value Vr0Then, go to step 305;
step 304, controlling the H-bridge chopper module to enable the energy storage capacitor to discharge through the transmitting coil, and performing step 302;
step 305, determine whether the difference is less than or equal to the one-way charging threshold Vr1(ii) a When the difference is larger than the one-way charging critical value Vr1Then, go to step 306; when the difference is less than or equal to the one-way charging critical value Vr1Go to step 315;
step 306, judging whether the difference value is less than or equal to two paths of charging critical values Vr2(ii) a When the difference value is larger than two paths of charging critical values Vr2Then, go to step 307; when the difference value is less than or equal to two paths of charging critical values Vr2Go to step 311;
step 307, controlling three paths of parallel DC-DC converter modules, including a first DC-DC converter module 3, a second DC-DC converter module 6 and a third DC-DC converter module 9, to charge an energy storage capacitor in a constant current mode;
step 308, obtaining the difference between the current preset charging voltage and the voltage value of the energy storage capacitor;
step 309, judging whether the difference value is equal to two paths of charging critical values Vr2(ii) a When the difference value is equal to two paths of charging critical values Vr2Then, go to step 310; when the difference value is larger than two paths of charging critical values Vr2Go to step 307;
step 310, controlling the first DC-DC converter module 3 to perform soft shutdown;
step 311, controlling the remaining two parallel DC-DC converter modules, including the second DC-DC converter module 6 and the third DC-DC converter module 9, to charge the energy storage capacitor in a constant current mode;
step 312, obtaining a difference between the current preset charging voltage and the voltage value of the energy storage capacitor;
step 313, determine if the difference is equal to the one-way charging threshold Vr1(ii) a When the difference is equal to the one-way charging critical value Vr1Then, go to step 314; when the difference is larger than the one-way charging critical value Vr1Go to step 311;
step 314, controlling the second DC-DC converter module 6 to perform soft shutdown;
step 315, controlling the last path of third DC-DC converter module 9 to charge the energy storage capacitor in a constant current mode;
step 316, judging whether a switching condition is reached; when the switching condition is reached, go to step 317; when the switching condition is not met, go to step 315;
step 317, controlling the third DC-DC converter module 9 to charge the energy storage capacitor in a constant voltage mode;
step 318, judging whether the charging is finished; when the charging completion condition is met, the charging is finished; when the charging completion condition is not satisfied, step 317 is performed.
According to the charging control method provided by the invention, the energy storage capacitor is subjected to a multi-stage constant-current-first and single-stage constant-voltage charging mode through a multi-stage regulation charging algorithm, the advantages of high charging speed of the multi-stage constant-current charging mode and high charging precision of the constant-voltage charging mode are fully utilized, and the charging speed and precision of the charging device are effectively improved; furthermore, a reasonable charging mode and a charging mode are selected according to the difference value of the pre-charging voltage and the voltage of the energy storage capacitor, so that the charging speed and the charging precision of the charging device are further improved; furthermore, the stability and the service life of the charging device are ensured through a multi-stage regulation soft turn-off mode; furthermore, the reliability, the charging speed and the precision of the charging device are further improved through a reasonable constant current to voltage switching mode.
The above charging method is described below in a specific operation procedure:
charging powerThe voltage preset value is 50V, the initial value of the voltage of the energy storage capacitor is 0V, the constant current output current of each DC-DC converter module is 1A, and the sampling resistor RSIs 1 omega, the diode conduction voltage VDThe voltage is 0.7V, and the specific working steps are as follows:
301, inputting a precharge voltage of 50V and a precharge voltage of V to the DSP + FPGA main control module through the PC by a workerr00V, one-way charging critical value Vr12.5V, two-way charging critical value Vr2＝5V；
Step 302, the DSP + FPGA master control module collects the voltage value of the energy storage capacitor in real time through the voltage detection module, and calculates the difference between the preset charging voltage and the voltage value of the energy storage capacitor: vC-V0＝50-0＝50V；
Step 303, charge critical value Vr00V, the difference being greater than Vr0Go to step 305;
step 305, a single charging threshold Vr12.5V, the difference being greater than Vr1Go to step 306;
step 306, two-way charging critical value Vr25V, the difference being greater than Vr2Go to step 307;
step 307, controlling three paths of parallel DC-DC converter modules, including a first DC-DC converter module 3, a second DC-DC converter module 6 and a third DC-DC converter module 9, to charge an energy storage capacitor in a constant current mode;
step 308, obtaining the difference between the current preset charging voltage and the voltage value of the energy storage capacitor;
step 309, determine if the difference is equal to Vr2(ii) a When the difference is equal to Vr2Then, go to step 310; when the difference is greater than Vr2Go to step 307;
step 310, controlling the first DC-DC converter module 3 to perform soft shutdown;
step 311, controlling the remaining two parallel DC-DC converter modules, including the second DC-DC converter module 6 and the third DC-DC converter module 9, to charge the energy storage capacitor in a constant current mode;
step 312, obtaining a difference between the current preset charging voltage and the voltage value of the energy storage capacitor;
step 313, determine if the difference is equal to Vr1(ii) a When the difference is equal to Vr1Then, go to step 314; when the difference is greater than Vr1Go to step 311;
step 314, controlling the second DC-DC converter module 6 to perform soft shutdown;
step 315, controlling the last path of third DC-DC converter module 9 to charge the energy storage capacitor in a constant current mode;
step 316, judging whether a switching condition is reached; the switching conditions are as follows: v1＝VD+VCWhen the switching condition is reached, step 317 is performed at 50.7V; when the switching condition is not met, go to step 315;
step 317, controlling the third DC-DC converter module 9 to charge the energy storage capacitor in a constant voltage mode;
step 318, judging whether the charging is finished; the charging completion conditions are as follows: v099.9% by 50V 49.95V, and when the charge completion condition is satisfied, the charge is ended; when the charging completion condition is not satisfied, performing step 317;
finally, after the charging is completed, the voltage of the energy storage capacitor is shown to be 49.951V, the precision is 49.951V/50V-99.902%, the precision requirement is met, and each module works stably and reliably.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1.一种地面磁共振多级调控快速高精度充电装置，其特征在于，该装置包括：1. a ground magnetic resonance multi-level regulation fast high-precision charging device, is characterized in that, this device comprises: 主控模块，接收来自上位机发送的储能电容的预充电电压以及储能电容的实际电压，根据所述预充电电压与所述实际电压之间的差值控制并从并联的DC-DC变换器模块选择多个DC-DC变换器模块以恒流模式对储能电容进行快速充电，根据所述差值的降低逐级对DC-DC变换器模块进行软关断，然后根据所述差值控制最后一个未被软关断的DC-DC变换器模块从恒流模式切换为恒压模式对储能电容进行充电；The main control module receives the pre-charged voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor sent from the host computer, controls and converts from the parallel DC-DC according to the difference between the pre-charged voltage and the actual voltage The converter module selects multiple DC-DC converter modules to rapidly charge the energy storage capacitor in constant current mode, softly turns off the DC-DC converter modules step by step according to the reduction of the difference, and then softly turns off the DC-DC converter modules according to the difference Control the last DC-DC converter module that is not turned off softly to switch from constant current mode to constant voltage mode to charge the energy storage capacitor; 所述DC-DC变换器模块包括：The DC-DC converter module includes: 至少一个恒流模式的DC-DC变换器模块，工作在恒流模式下，通过所述主控模块控制，为储能电容充电；At least one DC-DC converter module in constant current mode works in constant current mode and is controlled by the main control module to charge the energy storage capacitor; 一个恒流模式与恒压模式的DC-DC变换器模块，在所述主控模块控制下进行恒流模式与恒压模式切换，为储能电容充电；A DC-DC converter module in constant current mode and constant voltage mode, which switches between constant current mode and constant voltage mode under the control of the main control module to charge the energy storage capacitor; 所述主控模块获取恒流模式与恒压模式切换的DC-DC变换器模块的输出电压，并根据所述输出电压切换所述恒流模式与恒压模式切换的DC-DC变换器模块工作模式；The main control module obtains the output voltage of the DC-DC converter module switched between the constant current mode and the constant voltage mode, and switches the DC-DC converter module of the constant current mode and the constant voltage mode to work according to the output voltage model; 所述DC-DC变换器模块与储能电容之间设置有电流取样与防反充模块，所述电流取样与防反充模块检测DC-DC变换器模块的输出电流并通过电流反馈模块反馈至所述DC-DC变换器模块，所述电流取样与防反充模块包括：一电阻RS与所述电流取样与防反充模块的输入端连接作为电流取样电阻连接电流反馈回路，通过与所述电阻RS串联的二极管D输出防止反充，一电阻RL在与输入端连接后在DC-DC变换器软关断期间吸收剩余能量；A current sampling and anti-reverse charging module is arranged between the DC-DC converter module and the energy storage capacitor, and the current sampling and anti-reverse charging module detects the output current of the DC-DC converter module and feeds back to the output current through the current feedback module. In the DC-DC converter module, the current sampling and anti-reverse charging module includes: a resistor R S is connected to the input end of the current sampling and anti-reverse charging module as a current sampling resistor to connect the current feedback loop, and is connected with the current feedback loop. The output of the diode D connected in series with the resistor R S prevents reverse charging, and a resistor R L absorbs the remaining energy during the soft-off period of the DC-DC converter after being connected to the input end; 主控模块通过控制DC-DC变换器模块的PWM占空比逐渐减小至零，以每个开关周期减小5％的步长进行实现软关断；The main control module gradually reduces the PWM duty cycle of the DC-DC converter module to zero, and realizes soft turn-off with a step size of 5% per switching cycle; 选择充电模式前判断差值是否大于预设的充电临界值Vr0；Before selecting the charging mode, determine whether the difference is greater than the preset charging threshold V r0 ; 当差值小于或等于预设的充电临界值Vr0时，控制H桥斩波模块使储能电容通过发射线圈进行放电后返回差值的判断；When the difference is less than or equal to the preset charging critical value V r0 , control the H-bridge chopper module to make the energy storage capacitor discharge through the transmitting coil and return to the judgment of the difference; 当差值大于预设的充电临界值Vr0时，判断差值是否小于等于预设的单路充电临界值Vr1；When the difference is greater than the preset charging threshold V r0 , determine whether the difference is less than or equal to the preset single-channel charging threshold V r1 ; 当差值大于单路充电临界值Vr1时，判断差值是否小于等于两路充电临界值Vr2；When the difference is greater than the single-channel charging threshold V r1 , determine whether the difference is less than or equal to the two-channel charging threshold V r2 ; 当差值大于两路充电临界值Vr2，继续判断差值是否小于等于n路充电临界值Vrn；When the difference is greater than the two-way charging threshold V r2 , continue to judge whether the difference is less than or equal to the n-way charging threshold V rn ; 当差值大于n路充电临界值Vrn，控制n路并联的DC-DC变换器模块以恒流模式向储能电容充电；When the difference is greater than the n-way charging threshold V rn , control the n-way parallel DC-DC converter modules to charge the energy storage capacitor in a constant current mode; 根据所述差值的降低逐级对DC-DC变换器模块进行软关断包括：判断差值是否等于n-1路充电临界值Vrn-1，当差值等于n-1路充电临界值Vrn-1时，控制第n路的DC-DC变换器模块进行软关断，依次软关断至剩余一个DC-DC变换器模块以恒流模式向储能电容充电；判断是否达到恒流模式与恒压模式的切换条件；当达到切换条件时，控制最后一路DC-DC变换器模块以恒压模式向储能电容充电。The step-by-step soft shutdown of the DC-DC converter module according to the reduction of the difference includes: judging whether the difference is equal to the charging threshold V rn-1 of the n-1 circuits, and when the difference is equal to the charging threshold of the n-1 circuits When V rn-1 , control the DC-DC converter module of the nth channel to perform soft turn-off, and turn off softly in turn until the remaining DC-DC converter module charges the energy storage capacitor in constant current mode; judge whether the constant current is reached The switching condition between the mode and the constant voltage mode; when the switching condition is reached, the last DC-DC converter module is controlled to charge the energy storage capacitor in the constant voltage mode. 2.按照权利要求1所述的装置，其特征在于，所述装置还包括有H桥斩波模块与发射线圈连接，通过所述主控模块根据储能电容的预充电电压以及储能电容的实际电压之间的差值控制H桥斩波模块与发射线圈进行放电、或对储能电容充电。2. The device according to claim 1, characterized in that, the device further comprises an H-bridge chopper module connected to the transmitting coil, and the main control module is configured according to the pre-charge voltage of the energy storage capacitor and the value of the energy storage capacitor. The difference between the actual voltages controls the H-bridge chopper module and the transmitter coil to discharge, or to charge the energy storage capacitor. 3.按照权利要求1所述的装置，其特征在于，所述DC-DC变换器模块的输出电压V1＝I*RS+VD+V0，I是DC-DC变换器模块的输出电流，VD是电流取样与防反充模块中二极管D的正向导通电压，V0是储能电容的实际电压；恒流模式和恒压模式的切换条件是V1＝VD+VC，VC为预充电电压值，切换时刻，输出电流仍是恒流模式的电流值，之后逐渐降低，当电流降低到近似0A时，V0近似等于预充电电压VC，充电完成。3. The device according to claim 1, wherein the output voltage of the DC-DC converter module is V 1 =I* RS +V D +V 0 , and I is the output of the DC-DC converter module Current, V D is the forward voltage of diode D in the current sampling and anti-reverse charging module, V 0 is the actual voltage of the energy storage capacitor; the switching condition of constant current mode and constant voltage mode is V 1 =V D +V C , V C is the pre-charge voltage value. At the switching time, the output current is still the current value of the constant current mode, and then gradually decreases. When the current decreases to approximately 0A, V 0 is approximately equal to the pre-charge voltage V C , and the charging is completed. 4.按照权利要求1所述的装置，其特征在于，所述装置包括第一电压检测模块与第二电压检测模块分别用于检测能够实现恒压模式与恒流模式切换的DC-DC变换器模块的输出电压以及储能电容的实际电压。4. The device according to claim 1, wherein the device comprises a first voltage detection module and a second voltage detection module respectively for detecting a DC-DC converter capable of switching between a constant voltage mode and a constant current mode The output voltage of the module and the actual voltage of the storage capacitor. 5.一种地面磁共振多级调控快速充电控制方法，其特征在于，所述方法包括：根据储能电容的预充电电压以及储能电容的实际电压之间的差值控制并从并联的DC-DC变换器模块选择多个DC-DC变换器模块以恒流模式对储能电容进行快速充电，根据所述差值的降低逐级对DC-DC变换器模块进行软关断，根据所述差值控制其中最后一个未被软关断的DC-DC变换器模块从恒流模式切换为恒压模式对储能电容进行充电；5. A ground magnetic resonance multi-level regulation and fast charging control method, characterized in that, the method comprises: controlling according to the difference between the pre-charged voltage of the energy storage capacitor and the actual voltage of the energy storage capacitor and from the parallel DC - The DC converter module selects a plurality of DC-DC converter modules to rapidly charge the energy storage capacitors in a constant current mode, and softly turns off the DC-DC converter modules step by step according to the reduction of the difference. The difference value controls the last DC-DC converter module that is not turned off softly to switch from constant current mode to constant voltage mode to charge the energy storage capacitor; 选择充电模式前判断差值是否大于预设的充电临界值Vr0；Before selecting the charging mode, determine whether the difference is greater than the preset charging threshold V r0 ; 当差值小于或等于预设的充电临界值Vr0时，控制H桥斩波模块使储能电容通过发射线圈进行放电后返回差值的判断；When the difference is less than or equal to the preset charging critical value V r0 , control the H-bridge chopper module to make the energy storage capacitor discharge through the transmitting coil and return to the judgment of the difference; 当差值大于预设的充电临界值Vr0时，判断差值是否小于等于预设的单路充电临界值Vr1；When the difference is greater than the preset charging threshold V r0 , determine whether the difference is less than or equal to the preset single-channel charging threshold V r1 ; 当差值大于单路充电临界值Vr1时，判断差值是否小于等于两路充电临界值Vr2；When the difference is greater than the single-channel charging threshold V r1 , determine whether the difference is less than or equal to the two-channel charging threshold V r2 ; 当差值大于两路充电临界值Vr2，继续判断差值是否小于等于n路充电临界值Vrn；When the difference is greater than the two-way charging threshold V r2 , continue to judge whether the difference is less than or equal to the n-way charging threshold V rn ; 当差值大于n路充电临界值Vrn，控制n路并联的DC-DC变换器模块以恒流模式向储能电容充电；When the difference is greater than the n-way charging threshold V rn , control the n-way parallel DC-DC converter modules to charge the energy storage capacitor in a constant current mode; 根据所述差值的降低逐级对DC-DC变换器模块进行软关断包括：判断差值是否等于n-1路充电临界值Vrn-1，当差值等于n-1路充电临界值Vrn-1时，控制第n路的DC-DC变换器模块进行软关断，依次软关断至剩余一个DC-DC变换器模块以恒流模式向储能电容充电；判断是否达到恒流模式与恒压模式的切换条件；当达到切换条件时，控制最后一路DC-DC变换器模块以恒压模式向储能电容充电。The step-by-step soft shutdown of the DC-DC converter module according to the reduction of the difference includes: judging whether the difference is equal to the charging threshold V rn-1 of the n-1 circuits, and when the difference is equal to the charging threshold of the n-1 circuits When V rn-1 , control the DC-DC converter module of the nth channel to perform soft turn-off, and turn off softly in turn until the remaining DC-DC converter module charges the energy storage capacitor in constant current mode; judge whether the constant current is reached The switching condition between the mode and the constant voltage mode; when the switching condition is reached, the last DC-DC converter module is controlled to charge the energy storage capacitor in the constant voltage mode.
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