CN117748950A - Self-adaptive load balancing system for time domain excitation and control method - Google Patents
Self-adaptive load balancing system for time domain excitation and control method Download PDFInfo
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- CN117748950A CN117748950A CN202410148066.9A CN202410148066A CN117748950A CN 117748950 A CN117748950 A CN 117748950A CN 202410148066 A CN202410148066 A CN 202410148066A CN 117748950 A CN117748950 A CN 117748950A
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Abstract
The invention relates to the technical field of self-adaptive load balancing for time domain excitation, in particular to a self-adaptive load balancing system for time domain excitation and a control method. The power supply comprises a buck DC-DC power supply module, a load module and a control module: a buck DC-DC power module, a load module for consuming an output power of the transmitter during a period when the transmitter stops supplying power to the ground; a control module for measuring the output voltage and current of the transmitter during the period of supplying power to the ground and passing through the pure resistive load R L And the ground resistance R is calculated to obtain the voltage reduction proportion; and the power supply voltage of the transmitter is subjected to step-down conversion into the load power supply voltage according to the step-down proportion. The invention is based on the step-down proportion obtained by real-time calculation, and corresponds to the step-down proportion to match the step-down through the duty ratio k of the PWM signalDC-DC power supply module for regulating load supply voltage V L Then the load module is enabled to supply voltage V to the load L The output power of the transmitter can be consumed in real time to achieve adaptive matching.
Description
Technical Field
The invention relates to the technical field of self-adaptive load balancing for time domain excitation, in particular to a self-adaptive load balancing system for time domain excitation and a control method.
Background
In the field of geophysical prospecting, time domain induced polarization (Time-Domain Induced Polarization, TDIP) is a widely used method for using currents injected into the subsurface to excite geological media to obtain information about the subsurface structure by measuring the polarization effects of the media. The technology is particularly suitable for detecting ore bodies, underground water, pollutants and the like. In TDIP measurements, a complete current injection cycle typically includes four phases of forward power, power down, reverse power, and power down again. In this process, the polarization characteristic parameters of the geological medium, such as the charge capacity and the polarization rate, can be obtained by analyzing the natural decaying secondary electric field generated after the forward power supply is finished.
In the geological exploration process, the change range of the grounding resistance is larger due to the influence of the non-uniformity of a geological structure, the diversity of ground conditions and environmental factors. When the transmitter stops supplying power to the ground, the transmitter needs a balance load to absorb the residual current of the transmitter, so as to ensure the stability of the load of the transmitter and reduce the impact on the transmitter caused by the load change. Conventional methods typically employ a fixed balanced load, but this approach is less flexible in dealing with wide variations in ground resistance and is also less convenient to match the load in actual operation.
Disclosure of Invention
The invention provides a self-adaptive load balancing system for time domain excitation and a control method, which can overcome certain or certain defects in the prior art.
The invention relates to an adaptive load balancing system for time domain power excitation, which comprises a buck DC-DC power module, a load module and a control module, wherein the load module comprises a power source module, a power source module and a power source module, wherein the power source module comprises a power source module, a power source module and a power source module, and the power source module comprises a power source module and a power source module:
a buck DC-DC power module includes an input terminal for inputting a transmitter output voltage V and a power supply voltage V for outputting a load L An output terminal of (a);
a load module for consuming an output power of the transmitter during a period when the transmitter stops supplying power to the ground; comprising means for supplying a voltage V at said load L Pure resistive load R consuming transmitter output power L ；
The control module is used for measuring output voltage and current of the transmitter in the period of supplying power to the ground so as to calculate and obtain the ground resistance R based on the output voltage and current; and through the pure resistive load R L And the ground resistance R is calculated to obtain the voltage reduction proportion; and is also used for down-converting the output voltage V of the transmitter into the load supply voltage V according to the down-converting proportion L 。
Preferably, the control module comprises a control unit MCU; the control unit MCU is used for measuring the output voltage and the output current; the control unit MCU is provided with an output end for outputting a PWN signal, and the output end is connected with a power tube T;
the control unit MCU is used for calculating and obtaining the duty ratio k of the PWM signal for controlling the power tube T, and the calculation formula is as followsGenerating a PWM signal for controlling the power tube T; the step-down ratio is equal to the duty cycle k of the PWM signal, and the load supply voltage V L ＝kV。
Preferably, when the PWM signal duty cycle k=1, the pure resistive load R L Absorbing the maximum power output by the transmitter.
Preferably, the PWM signal duty cycle k is used to adjust between 0-1 so that it is applied to the pure resistive load R L Load supply voltage V on L Varying between 0 and the transmitter output voltage V to provide a pure resistive load R L The power dissipated above corresponds to the power dissipated from earth during the time the transmitter is powering the earth.
Preferably, the period of the PWM signal takes 200 microseconds.
Preferably, the step-down DC-DC power module includes filter capacitors C1 and C2, a power tube T, a freewheeling diode D and an energy storage inductor L.
The invention also provides a control method of the self-adaptive load balancing system for time domain excitation, which is realized based on the self-adaptive load balancing system for time domain excitation, and specifically comprises the following steps:
step S1, during the period that the transmitter keeps supplying power to the ground, measuring output voltage and current through a control module and calculating to obtain a step-down proportion;
step S2, based on the step-down proportion during the period that the transmitter stops supplying power to the ground, the load power supply voltage V is enabled to be the same as the load power supply voltage V through the step-down DC-DC power supply module L Equal to the product of the step-down ratio and the transmitter output voltage V;
step S3, passing through pure resistive load R L At the load supply voltage V L The output power of the transmitter is consumed.
Compared with the prior art, the invention has the following improvements: the voltage reduction proportion obtained based on real-time calculation is accurately corresponding to the voltage reduction proportion through the duty ratio k of the PWM signal and is matched with the voltage reduction type DC-DC power supply module to adjust the load power supply voltage V in real time L Then the load module is enabled to supply voltage V to the load L The output power of the transmitter can be consumed in real time, so that better self-adaptive matching is realized.
Drawings
FIG. 1 is a schematic flow chart of a time domain excitation power supply cycle;
FIG. 2 is a schematic diagram of an adaptive load balancing system for time domain excitation according to the present invention;
fig. 3 is a timing relationship between the PWM signal and the power supply period signal in embodiment 1.
Detailed Description
Example 1
The embodiment provides a time domain excitation self-adaptive load balancing system, which comprises a control unit MCU and a filter capacitor C 1 、C 2 A power tube T, a freewheeling diode D, an energy storage inductance L and a pure resistive load R L Composition; the MCU is used for measuring output voltage and current during the period that the transmitter supplies power to the ground, calculating the duty ratio k of the PWM signal of the control power tube, and generating the PWM signal of the control power tube; a specific schematic diagram is shown in fig. 2.
Capacitors C1 and C2, a power tube T, a freewheeling diode D and an energy storage inductor form a buck DC-DC power supply module, and output load supply voltage V L =kv, V is the transmitter output voltage.
Pure resistive load R L For consuming the output power of the transmitter during (2) and (4) of the power supply period, so as to keep the transmitter output power stable throughout the power supply period.
In this embodiment, the smallest pure resistive load R is used L As a transmitter output power consuming element, the maximum power output by the transmitter can be absorbed when the PWM signal duty cycle k=1, ensuring that the load is kept constant also at full transmitter power output. The adaptive load balancing system adjusts the PWM duty cycle k between 0-1 such that the balanced load network is applied to the pure resistive load R L The voltage on the resistor varies between 0 and the transmitter output voltage V and satisfies the pure resistive load R L The power consumed by the power supply is equivalent to the power consumed by the ground, so that the aim of controlling the power consumed by the load to balance the load of the transmitter is fulfilled.
Assuming that the maximum output voltage of the transmitter is Vmax and the maximum output current is Imax, R in the load is balanced L The value of (2) is Vmax/Imax.
During the periods (1) and (3) of the power supply period, the MCU measures the voltage and current values output by the transmitter to the ground through the internal ADC, and simultaneously makes the duty ratio of the PWM signal be 0; during (2) and (4) of the power supply cycle, the MCU calculates the ground resistance R according to the current and voltage values output to the ground by the transmitter during (1) and (3).
MCU is according to the formulaCalculating the duty ratio of the PWM signal, and generating the PWM signal to control the power tube T, wherein the load R L The voltage on the power supply is kV, and the consumed power is V 2 R. Remain unchanged.
To ensure load balancing accuracy, the period of the PWM signal is taken to be one thousandth of the time of (2) and (4) of the power supply period, preferably 200 microseconds.
The embodiment also provides a specific application example of the adaptive load balancing system for time domain excitation and the control method;
we use the transmitter maximum output voltage 1000V, maximum output current 60A; that is, the maximum output power of the transmitter is 60KW, and when the transmitter is used, the power output to the ground is between 0KW and 60 KW. Pure resistor for adaptively balancing load provided for the transmitterWhen the power supply works in a certain place in river north, the output current 35A is output to the ground at the output voltage of 1000V, the output power to the ground is 35KW, and the ground resistance r= 28.571 Ω is calculated.At this time balance the load output to R L Is of the voltage V L ＝kV＝0.764*1000＝764V；
Balancing the power consumed by a load p=v L 2 /R L ＝(764) 2 16.67= 35.014KW. Balancing the load consumes power comparable to the power consumed by ground.
The timing relationship between the PWM signal and the power supply period signal is shown in fig. 3.
It is to be understood that, based on one or several embodiments provided herein, those skilled in the art may combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments, which do not exceed the protection scope of the present application.
The invention and its embodiments have been described above by way of illustration and not limitation, and the examples are merely illustrative of embodiments of the invention and the actual construction is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (7)
1. The self-adaptive load balancing system for time domain excitation is characterized by comprising a buck DC-DC power supply module, a load module and a control module:
a buck DC-DC power module includes an input terminal for inputting a transmitter output voltage V and a power supply voltage V for outputting a load L An output terminal of (a);
a load module for consuming an output power of the transmitter during a period when the transmitter stops supplying power to the ground; comprising means for supplying a voltage V at said load L Pure resistive load R consuming transmitter output power L ；
The control module is used for measuring output voltage and current of the transmitter in the period of supplying power to the ground so as to calculate and obtain the ground resistance R based on the output voltage and current; and through the pure resistive load R L And the ground resistance R is calculated to obtain the voltage reduction proportion; and the power supply circuit is also used for reducing and converting the output voltage V of the transmitter into the load power supply voltage V according to the reducing proportion.
2. The adaptive load balancing system for time domain excitation according to claim 1, wherein the control module comprises a control unit MCU; the control unit MCU is used for measuring the output voltage and the output current; the control unit MCU is provided with an output end for outputting PWM signals, and the output end is connected with a power tube T;
the control unit MCU is used for calculating and obtaining the duty ratio k of the PWM signal for controlling the power tube, and the calculation formula is as followsGenerating a PWM signal for controlling the power tube T; the step-down ratio is equal to the duty cycle k of the PWM signal, and the load supply voltage V L ＝kV。
3. An adaptive negative for time domain excitation according to claim 2Load balancing system, characterized in that the pure resistive load R when the PWM signal duty cycle k=1 L Absorbing the maximum power output by the transmitter.
4. An adaptive load balancing system for time domain excitation according to claim 2, wherein the PWM signal duty cycle k is adapted to be adjusted between 0-1 such that it is applied to a purely resistive load R L Load supply voltage V on L Varying between 0 and the transmitter output voltage V; so that the pure resistive load R L The power dissipated above corresponds to the power dissipated from earth during the time the transmitter is powering the earth.
5. An adaptive load balancing system for time domain energization according to claim 2, wherein the period of the PWM signal takes 200 microseconds.
6. The adaptive load balancing system for time domain excitation according to claim 1, wherein the step-down DC-DC power module comprises filter capacitors C1 and C2, a power tube T, a freewheeling diode D and an energy storage inductor L.
7. A control method of an adaptive load balancing system for time domain excitation is characterized by comprising the following steps: an adaptive load balancing system for time domain power up according to any of claims 1-6, comprising the steps of:
step S1, during the period that the transmitter keeps supplying power to the ground, measuring output voltage and current through a control module and calculating to obtain a step-down proportion;
step S2, based on the step-down proportion during the period that the transmitter stops supplying power to the ground, the load power supply voltage V is enabled to be the same as the load power supply voltage V through the step-down DC-DC power supply module L Equal to the product of the step-down ratio and the transmitter output voltage V;
step S3, passing through pure resistive load R L At the load supply voltage V L The output power of the transmitter is consumed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410148066.9A CN117748950A (en) | 2024-02-02 | 2024-02-02 | Self-adaptive load balancing system for time domain excitation and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410148066.9A CN117748950A (en) | 2024-02-02 | 2024-02-02 | Self-adaptive load balancing system for time domain excitation and control method |
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| CN117748950A true CN117748950A (en) | 2024-03-22 |
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