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 PDFInfo
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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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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention belongs to the field of geophysical exploration equipment, and relates to a ground magnetic resonance multistage regulation and control quick high-precision charging device and a charging control method, wherein a main control module controls and selects a plurality of DC-DC converter modules from parallel DC-DC converter modules according to a difference value between a pre-charging voltage and an actual voltage to quickly charge an energy storage capacitor in a constant current mode, the DC-DC converter modules are gradually subjected to soft turn-off according to the reduction of the difference value, and then the last DC-DC converter module which is not subjected to soft turn-off is controlled according to the difference value to charge the energy storage capacitor in a constant voltage mode; or controlling a 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. The charging device adopts the multi-path parallel DC/DC conversion module to charge the energy storage capacitor, and effectively improves the charging speed and precision of the charging device by firstly charging through multi-stage constant current and then adopting a single-stage constant voltage charging mode.
Description
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 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 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;
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 305, a single charging threshold Vr12.5V, the difference being greater than Vr1Go to step 306;
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;
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. A ground magnetic resonance multi-stage regulation and control quick high-precision charging device is characterized by comprising:
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 according to a difference value between the pre-charging voltage and the actual voltage to rapidly charge the energy storage capacitor in a constant current mode, soft-switches the DC-DC converter modules step by step according to reduction of the difference value, and then controls the last DC-DC converter module which is not soft-switched to charge the energy storage capacitor from the constant current mode to the constant voltage mode according to the difference value;
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 in a constant current mode and a constant voltage mode 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 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;
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 the 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 comprises: 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 RLAbsorbing residual energy during soft turn-off of the DC-DC converter after connection with the input;
the main control module gradually reduces the PWM duty ratio of the DC-DC converter module to zero by controlling, and reduces the step length by 5% in each switching period to realize soft turn-off;
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 energy storage capacitor passes through the transmitting coil, the H-bridge chopper module is controlled to enable the energy storage capacitor to pass through the transmitting coilJudging the return difference after discharging;
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 VrnControlling 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.
2. The device according to claim 1, further comprising an H-bridge chopper module connected to the transmitting coil, wherein the H-bridge chopper module is controlled by the main control module to discharge or charge the energy storage capacitor according to a difference between a pre-charge voltage of the energy storage capacitor and an actual voltage of the energy storage capacitor.
3. An arrangement according to claim 1, characterized in that 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; constant temperatureThe switching condition of the flow 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.
4. The apparatus of claim 1, wherein the apparatus comprises a first voltage detection module and a second voltage detection module for detecting an output voltage of the DC-DC converter module capable of switching between the constant voltage mode and the constant current mode and an actual voltage of the energy storage capacitor, respectively.
5. A ground magnetic resonance multi-stage regulation and control quick charging control method is characterized by comprising 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 the last DC-DC converter module which is not subjected to soft turn-off to be switched from the constant current mode to a constant voltage mode to charge the energy storage capacitor according to the difference;
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 paths of chargingCritical value Vrn；
When the difference is larger than n charging critical values VrnControlling 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.
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