Power supply voltage regulating device and downhole instrument

Abstract

The invention discloses a power supply voltage adjusting device and an underground instrument, and the device comprises a DC-DC circuit, the input end of the DC-DC circuit is connected with the output end of a power supply, and the DC-DC circuit is used for converting a DC signal of a first voltage inputted by the power supply into a DC signal of a second voltage; the input end of the booster circuit is connected with the output end of the DC-DC circuit, the booster circuit is used for boosting the DC signal of the second voltage, and the output end of the booster circuit outputs a DC signal of a third voltage; the input end of the adjusting circuit is connected with the output end of the booster circuit, the output end of the adjusting circuit is connected with the feedback end of the DC-DC circuit, and the adjusting circuit is used for adjusting the current injected into the feedback end of the DC-DC circuit according to the target voltage and the third voltage of the direct current signal output by the booster circuit so as to adjust the second voltage of the direct current signal output by the DC-DC circuit, and the voltage of the DC signal output by the booster circuit is adjusted to the target voltage. The device can ensure the safety of underground instruments, and can also save the cost.

Description

Technical Field

[0001] The present invention relates to the field of downhole instruments, and in particular to a power supply voltage regulating device and a downhole instrument. Background Art

[0002] Well logging equipment is of great significance to oil exploration and development. The application of logging equipment and logging technology to mine detection can effectively collect a variety of physical information in the underground environment such as force, heat, nuclear, etc.

[0003] Due to the complex downhole environment, the safety of downhole instruments needs to be ensured under different working conditions. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a power supply voltage regulating device that can ensure the safety of downhole instruments and save costs.

[0005] The second object of the present invention is to provide a downhole instrument.

[0006] To achieve the above-mentioned purpose, a first aspect of the present invention provides a power supply voltage regulating device, which includes: a DC-DC circuit, wherein the input end of the DC-DC circuit is connected to the output end of a power supply, and is used to convert a DC signal of a first voltage input by the power supply into a DC signal of a second voltage, wherein the first voltage is greater than the second voltage; a boost circuit, wherein the input end of the boost circuit is connected to the output end of the DC-DC circuit, and is used to boost the DC signal of the second voltage, and the output end of the boost circuit outputs a DC signal of a third voltage; a regulating circuit, wherein the input end of the regulating circuit is connected to the output end of the boost circuit, and the output end of the regulating circuit is connected to the feedback end of the DC-DC circuit, and is used to adjust the current injected into the feedback end of the DC-DC circuit according to the target voltage and the third voltage of the DC signal output by the boost circuit, so as to adjust the second voltage of the DC signal output by the DC-DC circuit, so that the voltage of the DC signal output by the boost circuit is adjusted to the target voltage.

[0007] According to the power supply voltage regulating device of the embodiment of the present invention, the regulating circuit is used to regulate the extracted current of the feedback end of the DC-DC circuit to regulate the second voltage of the DC signal output by the DC-DC circuit, and the boost circuit boosts the DC signal of the second voltage output by the DC-DC circuit to adjust the voltage of the DC signal output by the boost circuit to the target voltage.

[0008] In addition, the power supply voltage regulating device proposed in the above embodiment of the present invention may also have the following additional technical features:

[0009] According to one embodiment of the present invention, the regulation circuit includes: a feedback sub-circuit, the input end of the feedback sub-circuit is connected to the input end of the regulation circuit, and is used to convert the DC signal of the third voltage to positive and reduce it by a preset ratio, and output a DC signal of a fourth voltage; a single-chip microcomputer, the ADC pin of the single-chip microcomputer is connected to the output end of the feedback sub-circuit, and the PWM1 pin of the single-chip microcomputer is connected to the input end of the regulation sub-circuit, and is used to adjust the duty cycle of the first PWM signal output by the PWM1 pin of the single-chip microcomputer according to the DC signal of the fourth voltage; a regulation sub-circuit, the output end of the regulation sub-circuit is connected to the output end of the regulation circuit, and is used to adjust the first PWM signal and output a DC signal of an adjustable voltage to adjust the second voltage of the DC signal output by the DC-DC circuit.

[0010] According to one embodiment of the present invention, the boost circuit includes: a boost sub-circuit, a first end of the boost sub-circuit is connected to the input end of the boost circuit, a second end of the boost sub-circuit is connected to the output end of the boost circuit, and is used to boost the DC signal of the second voltage according to a preset boost multiple; a driving sub-circuit, a driving end of the boost sub-circuit is connected to the first end of the driving sub-circuit, and a second end of the driving sub-circuit is connected to the PWM2 pin of the microcontroller, and is used to drive the boost sub-circuit based on a second PWM signal input from the PWM2 pin of the microcontroller.

[0011] According to one embodiment of the present invention, the feedback sub-circuit includes a first resistor, a second resistor, a first operational amplifier, a third resistor, a fourth resistor, a first capacitor and a second operational amplifier, the first end of the first resistor is connected to the input end of the feedback sub-circuit, the second end of the first resistor is connected to the negative phase end of the first operational amplifier through the second resistor, the positive phase end of the first operational amplifier is grounded, the output end of the first operational amplifier is connected to the negative phase end of the first operational amplifier through the third resistor and the fourth resistor in sequence, the voltage end of the first operational amplifier is connected to a power supply and forms a first node, the first node is grounded through the first capacitor, the output end of the first operational amplifier is connected to the positive phase end of the second operational amplifier, the output end of the second operational amplifier is connected to the output end of the feedback sub-circuit and forms a second node, and the second node is connected to the negative phase end of the second operational amplifier.

[0012] According to one embodiment of the present invention, the regulating subcircuit includes a fifth resistor, a third operational amplifier, a second capacitor, a sixth resistor, a first transistor, and a second transistor. The first end of the fifth resistor is connected to the input end of the regulating subcircuit, the second end of the fifth resistor is connected to the positive phase end of the third operational amplifier to form a third node, the third node is grounded through the second capacitor, the power supply end of the third operational amplifier is connected to the power supply, the ground end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected to the first end of the sixth resistor to form a fourth node, the fourth node is connected to the negative phase end of the third operational amplifier, the second end of the sixth resistor is connected to the collector of the first transistor to form a fifth node, the emitter of the first transistor is grounded, the base of the first transistor is connected to the base of the second transistor to form a sixth node, the fifth node is connected to the sixth node, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the output end of the regulating subcircuit.

[0013] According to one embodiment of the present invention, the DC-DC circuit includes: a DC-DC converter, a third capacitor, a fourth capacitor, a fifth capacitor, a seventh resistor, a sixth capacitor, a first inductor, an eighth resistor, a seventh capacitor, a ninth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor and a tenth resistor, the VIN1, VIN2 and EN pins of the DC-DC converter are connected to the input end of the DC-DC circuit and form a seventh node, the seventh node is grounded through the third capacitor, the SYNC pin of the DC-DC converter is grounded, the SS pin of the DC-DC converter is grounded through the fourth capacitor, the INTVCC pin of the DC-DC converter is grounded through the fifth capacitor, the RT pin of the DC-DC converter is grounded through the seventh resistor, the BST pin of the DC-DC converter is connected to the first end of the first inductor through the sixth capacitor, and the The SW1, SW2, and SW3 pins of the DC-DC converter are all connected to the first end of the first inductor, the BIAS pin of the DC-DC converter is connected to the second end of the first inductor, the FB pin of the DC-DC converter is connected to the first end of the eighth resistor to form an eighth node, the eighth node is connected to the feedback end of the DC-DC circuit, the second node is grounded through the ninth resistor, the PAD and GND pins of the DC-DC converter are grounded, the second end of the eighth resistor is connected to the second end of the first inductor, the seventh capacitor is connected in parallel to the eighth resistor, the second end of the first inductor is connected to the first ends of the eighth capacitor, the ninth capacitor, and the tenth capacitor, respectively, the second ends of the eighth capacitor, the ninth capacitor, and the tenth capacitor are grounded, and the first end of the tenth capacitor is connected to the output end of the DC-DC circuit through the tenth resistor.

[0014] According to one embodiment of the present invention, the boost sub-circuit includes: a transformer, an eleventh capacitor, a first diode, a twelfth capacitor, a second diode, a thirteenth capacitor, a third diode, a fourteenth capacitor, a fourth diode, a fifteenth capacitor, a fifth diode, a sixteenth capacitor, a sixth diode and an eleventh resistor, the first pin of the transformer is connected to the first end of the boost sub-circuit, the fourth pin of the transformer is connected to the driving end of the boost sub-circuit, the third pin of the transformer is grounded, the fifth pin of the transformer is connected to the positive electrode of the first diode through the eleventh capacitor, the negative electrode of the first diode is grounded, the negative electrode of the first diode is connected to the positive electrode of the second diode through the twelfth capacitor, and the positive electrode of the second diode is connected to the negative electrode of the first diode. The negative electrode is connected to the positive electrode of the third diode through the thirteenth capacitor, the negative electrode of the third diode is connected to the positive electrode of the second diode, the negative electrode of the third diode is connected to the positive electrode of the fourth diode through the fourteenth capacitor, the negative electrode of the fourth diode is connected to the positive electrode of the third diode, the negative electrode of the fourth diode is connected to the positive electrode of the fifth diode through the fifteenth capacitor, the negative electrode of the fifth diode is connected to the positive electrode of the fourth diode, the negative electrode of the fifth diode is connected to the positive electrode of the sixth diode through the sixteenth capacitor, the negative electrode of the sixth diode is connected to the positive electrode of the fifth diode, and the positive electrode of the sixth diode is connected to the second end of the boost sub-circuit through the eleventh resistor.

[0015] According to one embodiment of the present invention, the driving sub-circuit includes a driver, a twelfth resistor and a thirteenth resistor, the gate of the driver is connected to the second end of the driving sub-circuit through the twelfth resistor, the drain of the driver is connected to the first end of the driving sub-circuit, and the source of the driver is grounded through the thirteenth resistor.

[0016] According to an embodiment of the present invention, the DC-DC converter has built-in feedback regulation logic.

[0017] To achieve the above-mentioned purpose, a second embodiment of the present invention provides a downhole instrument, comprising a power supply voltage regulating device as provided in the first embodiment of the present invention.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a power supply voltage regulating device according to an embodiment of the present invention;

[0020] Figure 2is a schematic diagram of a feedback subcircuit of an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a regulating subcircuit according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a DC-DC circuit according to an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a voltage boost subcircuit according to an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a driving sub-circuit according to an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of a downhole instrument according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The power supply voltage regulating device and downhole instrument of the embodiment of the present invention are described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] Figure 1 FIG. 1 is a schematic diagram of a power supply voltage regulating device according to an embodiment of the present invention. Figure 1 As shown, the power supply voltage regulating device 100 may include:

[0029] A DC-DC circuit 10, wherein an input terminal of the DC-DC circuit 10 is connected to an output terminal of a power supply, and is used to convert a DC signal of a first voltage input by the power supply into a DC signal of a second voltage, wherein the first voltage is greater than the second voltage;

[0030] A boost circuit 20, wherein the input end of the boost circuit 20 is connected to the output end of the DC-DC circuit 10, and is used to boost the DC signal of the second voltage, and the output end of the boost circuit 20 outputs a DC signal of a third voltage;

[0031] The regulating circuit 30 has an input end connected to the output end of the boost circuit 20, and an output end of the regulating circuit 30 connected to the feedback end of the DC-DC circuit 10, and is used to regulate the current injected into the feedback end of the DC-DC circuit 10 according to the target voltage and the third voltage of the DC signal output by the boost circuit 20, so as to regulate the second voltage of the DC signal output by the DC-DC circuit 10, so that the voltage of the DC signal output by the boost circuit 20 is adjusted to the target voltage.

[0032] Specifically, the target voltage is determined according to the current working condition of the downhole instrument. It is feasible to obtain the working conditions of the downhole instrument recorded by the staff during the work process, and determine the working voltage corresponding to each working condition by analyzing each working condition. The working conditions include: the temperature of the downhole instrument increases, the temperature of the downhole instrument decreases, and other conditions. By detecting the current working condition of the downhole instrument, the corresponding working voltage is determined according to the current working condition, and the working voltage is recorded as the target voltage.

[0033] According to the target voltage and the third voltage of the DC signal output by the boost circuit 20, the current (extracted current) injected into the feedback terminal of the DC-DC circuit 10 is adjusted to adjust the second voltage of the DC signal output by the DC-DC circuit. The boost circuit 20 performs a boost process based on the DC signal of the second voltage output by the DC-DC circuit 10, so that the voltage of the DC signal output by the boost circuit 10 is adjusted to the target voltage.

[0034] The power supply voltage regulating device of the embodiment of the present invention uses the regulating circuit 30 to regulate the current injected into the feedback end of the DC-DC circuit 10 to regulate the second voltage of the DC signal output by the DC-DC circuit 10. The boost circuit 20 boosts the DC signal of the second voltage output by the DC-DC circuit 10 so that the voltage of the DC signal output by the boost circuit 20 is adjusted to the target voltage.

[0035] In one embodiment of the present invention, Figure 1 As shown, the regulating circuit 30 includes:

[0036] A feedback subcircuit 31, the input end of the feedback subcircuit 31 is connected to the input end of the regulating circuit 30, and is used to convert the DC signal of the third voltage into a positive signal and reduce it by a preset ratio, and output a DC signal of a fourth voltage;

[0037] A single-chip microcomputer 32, wherein an ADC pin of the single-chip microcomputer 32 is connected to the output end of the feedback sub-circuit 31, and a PWM1 pin of the single-chip microcomputer 32 is connected to the input end of the adjustment sub-circuit 33, and is used to adjust the duty cycle of the first PWM signal output by the PWM1 pin of the single-chip microcomputer 32 according to the DC signal of the fourth voltage;

[0038] The regulating subcircuit 33 has an output end connected to the output end of the regulating circuit 30 , and is used to regulate the first PWM signal and output a DC signal with an adjustable voltage to regulate the second voltage of the DC signal output by the DC-DC circuit 10 .

[0039] Specifically, since the DC signal of the third voltage output by the boost circuit 20 is a negative voltage, the feedback subcircuit 31 converts the DC signal of the third voltage to positive and reduces it by a preset ratio, and outputs a DC signal HV_ADC of the fourth voltage. The single-chip microcomputer 32 collects the DC signal HV_ADC of the fourth voltage input by the feedback subcircuit 31, calculates the magnitude of the fourth voltage, and adjusts the first PWM (Pulse Width Modulation) signal in a step-by-step manner with a duty cycle of 1% according to the magnitude of the fourth voltage. The regulating subcircuit 33 adjusts the first PWM signal to achieve the purpose of voltage stabilization, and outputs a step-regulated boosted DC voltage Uadj.

[0040] The duty cycle of the first PWM signal in the embodiment of the present invention is proportional to the voltage of the DC signal output by the regulating subcircuit 33. The larger the duty cycle of the first PWM signal, the larger the voltage of the DC signal output by the regulating subcircuit 33. The smaller the duty cycle of the first PWM signal, the smaller the voltage of the DC signal output by the regulating subcircuit 33.

[0041] In a specific embodiment of the present invention, the single chip microcomputer 32 may be a single chip microcomputer of the model S912ZVCA19F0MKH.

[0042] In one embodiment of the present invention, Figure 1 As shown, the boost circuit 20 includes:

[0043] A boost subcircuit 21, wherein a first end of the boost subcircuit 21 is connected to an input end of the boost circuit 20, and a second end of the boost subcircuit 21 is connected to an output end of the boost circuit 20, and is used to boost a DC signal of a second voltage according to a preset boost multiple;

[0044] The driving sub-circuit 22, the driving end of the boost sub-circuit 21 is connected to the first end of the driving sub-circuit 22, and the second end of the driving sub-circuit 22 is connected to the PWM2 pin of the microcontroller 32, and is used to drive the boost sub-circuit 21 based on the second PWM signal of the preset frequency and preset duty cycle input by the PWM2 pin of the microcontroller 32.

[0045] Specifically, the driving subcircuit 22 drives the primary side of the transformer in the boost subcircuit 21 based on the second PWM signal with a preset frequency and a preset duty cycle input by the PWM2 pin of the single-chip microcomputer 32, so as to double the AC voltage output by the secondary side of the transformer in the boost subcircuit 21.

[0046] In one embodiment of the present invention, Figure 2 As shown, the feedback sub-circuit 31 includes a first resistor R1, a second resistor R2, a first operational amplifier U1, a third resistor R3, a fourth resistor R4, a first capacitor C1 and a second operational amplifier U2. The first end of the first resistor R1 is connected to the input end of the feedback sub-circuit 11, the second end of the first resistor R1 is connected to the negative phase end of the first operational amplifier U1 through the second resistor R2, the positive phase end of the first operational amplifier U1 is grounded, the output end of the first operational amplifier U1 is connected to the negative phase end of the first operational amplifier U1 through the third resistor R3 and the fourth resistor R4 in sequence, the voltage end of the first operational amplifier U1 is connected to the power supply and forms a first node, the first node is grounded through the first capacitor C1, the output end of the first operational amplifier U1 is connected to the positive phase end of the second operational amplifier U2, the output end of the second operational amplifier U2 is connected to the output end of the feedback sub-circuit 11 and forms a second node, and the second node is connected to the negative phase end of the second operational amplifier U2.

[0047] Specifically, the feedback subcircuit 31 adopts a circuit composed of two operational amplifiers that converts negative voltage to positive voltage and scales it down proportionally. The first resistor R1, the second resistor R2, the first operational amplifier U1, the third resistor R3, the fourth resistor R4 and the first capacitor C1 scale the DC signal of the third voltage. The second operational amplifier U2 converts the scaled DC signal of the third voltage from a negative voltage to a positive voltage.

[0048] In a specific embodiment of the present invention, both the first operational amplifier U1 and the second operational amplifier U2 can be AD8642 operational amplifiers.

[0049] In one embodiment of the present invention, Figure 3 As shown, the regulating subcircuit 33 includes a fifth resistor R5, a third operational amplifier U3, a second capacitor C2, a sixth resistor R6, a first transistor Q1 and a second transistor Q2, a first end of the fifth resistor R5 is connected to the input end of the regulating subcircuit 33, a second end of the fifth resistor R5 is connected to the positive phase end of the third operational amplifier U3, and a third node is formed, the third node is grounded through the second capacitor C2, the power supply end of the third operational amplifier U3 is connected to the power supply, the ground end of the third operational amplifier U3 is grounded, the output end of the third operational amplifier U3 is connected to the first end of the sixth resistor R6, and a fourth node is formed, the fourth node is connected to the negative phase end of the third operational amplifier U3, the second end of the sixth resistor R6 is connected to the collector of the first transistor Q1, and a fifth node is formed, the emitter of the first transistor Q1 is grounded, the base of the first transistor Q1 is connected to the base of the second transistor Q2, and a sixth node is formed, the fifth node is connected to the sixth node, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the output end of the regulating subcircuit 33.

[0050] The first PWM signal output by the single chip microcomputer 32 of the embodiment of the present invention is filtered by the fifth resistor R5 and the second capacitor C2 and followed by the third operational amplifier U3, and then outputs a step-regulated boosted DC voltage Uadj.

[0051] Specifically, the first PWM signal output by the single-chip computer 32 is converted into a DC signal through an RC filter circuit composed of a fifth resistor R5 and a second capacitor C2 and input to the third operational amplifier U3. The third operational amplifier U3 outputs to the right side (first transistor Q1) of the current mirror circuit composed of a sixth resistor R6, a first transistor Q1 and a second transistor Q2, so that the left side (second transistor Q2) consumes the same current all the way. The DC-DC converter U4 in the DC-DC circuit 10 adjusts the output voltage (the DC signal of the second voltage) according to the current injected at the feedback terminal.

[0052] In a specific embodiment of the present invention, the third operational amplifier U3 may be an AD8642 operational amplifier.

[0053] In one embodiment of the present invention, Figure 4As shown, the DC-DC circuit 10 includes: a DC-DC converter U4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a seventh resistor R7, a sixth capacitor C6, a first inductor L1, an eighth resistor R8, a seventh capacitor C7, a ninth resistor R9, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10 and a tenth resistor R10, the VIN1, VIN2 and EN pins of the DC-DC converter U4 are connected to the input end of the DC-DC circuit 10 and form a seventh node, the seventh node is grounded through the third capacitor C3, the SYNC pin of the DC-DC converter U4 is grounded, the SS pin of the DC-DC converter U4 is grounded through the fourth capacitor C4, the INTVCC pin of the DC-DC converter U4 is grounded through the fifth capacitor C5, the RT pin of the DC-DC converter U4 is grounded through the seventh resistor R7, and the BST pin of the DC-DC converter U4 is connected to the first inductor L1 through the sixth capacitor C6. The first end of the DC-DC converter U4 is connected, the SW1, SW2, and SW3 pins of the DC-DC converter U4 are all connected to the first end of the first inductor L1, the BIAS pin of the DC-DC converter U4 is connected to the second end of the first inductor L1, the FB pin of the DC-DC converter U4 is connected to the first end of the eighth resistor R8, and an eighth node is formed. The eighth node is connected to the feedback end of the DC-DC circuit 10, the second node is grounded through the ninth resistor R9, the PAD and GND pins of the DC-DC converter U4 are grounded, the second end of the eighth resistor R8 is connected to the second end of the first inductor L1, the eighth resistor R8 is connected in parallel with the seventh capacitor, the second end of the first inductor L1 is respectively connected to the first ends of the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10, the second ends of the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are grounded, and the first end of the tenth capacitor C10 is connected to the output end of the DC-DC circuit 10 through the tenth resistor R10.

[0054] The DC-DC converter U4 in the embodiment of the present invention has built-in feedback regulation logic.

[0055] The DC-DC converter U4 in the embodiment of the present invention adopts a LT8610 DC-DC converter. The DC-DC converter U4 has the characteristics of wide voltage input, small load and high efficiency, and has the function of injecting current at the FB pin (feedback end) to adjust the output.

[0056] The initial voltage output by the DC-DC circuit 10 of the embodiment of the present invention is 10V.

[0057] In a specific embodiment of the present invention, Figure 5As shown, the boost subcircuit 21 includes: a transformer T1, an eleventh capacitor C11, a first diode D1, a twelfth capacitor C12, a second diode D2, a thirteenth capacitor C13, a third diode D3, a fourteenth capacitor C14, a fourth diode D4, a fifteenth capacitor C15, a fifth diode D5, a sixteenth capacitor C16, a sixth diode D6 and an eleventh resistor R11, a first pin of the transformer T1 is connected to a first end of the boost subcircuit, a fourth pin of the transformer T1 is connected to a driving end of the boost subcircuit, a third pin of the transformer T1 is grounded, a fifth pin of the transformer T1 is connected to a positive electrode of the first diode D1 through the eleventh capacitor C11, a negative electrode of the first diode D1 is grounded, and a negative electrode of the first diode D1 is connected to a positive electrode of the second diode D2 through the twelfth capacitor C12. The cathode of the second diode D2 is connected to the anode of the third diode D3 through the thirteenth capacitor C13, the cathode of the third diode D3 is connected to the anode of the second diode D2, the cathode of the third diode D3 is connected to the anode of the fourth diode D4 through the fourteenth capacitor C14, the cathode of the fourth diode D4 is connected to the anode of the third diode D3, the cathode of the fourth diode D4 is connected to the anode of the fifth diode D5 through the fifteenth capacitor C15, the cathode of the fifth diode D5 is connected to the anode of the fourth diode D4, the cathode of the fifth diode D5 is connected to the anode of the sixth diode D6 through the sixteenth capacitor C16, the cathode of the sixth diode D6 is connected to the anode of the fifth diode D5, and the anode of the sixth diode D6 is connected to the second end of the boost sub-circuit 21 through the eleventh resistor R11.

[0058] In a specific embodiment of the present invention, Figure 6 As shown, the driving sub-circuit 22 includes a driver U5, a twelfth resistor R12 and a thirteenth resistor R13, the gate of the driver U5 is connected to the second end of the driving sub-circuit 22 through the twelfth resistor R12, the drain of the driver U5 is connected to the first end of the driving sub-circuit 22, and the source of the driver U5 is grounded through the thirteenth resistor R13.

[0059] The boost circuit 10 in this embodiment adopts the bootstrap principle.

[0060] Specifically, the boost subcircuit 21 uses high voltage resistant diodes and capacitors. The driver U5 in the drive subcircuit 22 drives the primary side of the transformer T1 based on the second PWM signal with a fixed frequency and duty cycle input from the PWM2 pin of the microcontroller, and doubles the AC voltage output from the secondary side of the transformer T1.

[0061] The boost sub-circuit 21 in this embodiment multiplies the voltage of the DC signal of the second voltage six times.

[0062] The initial voltage output by the DC-DC circuit 10 of the embodiment of the present invention is 10V, and the initial voltage of the DC signal output by the corresponding boost circuit 10 is -1500V. That is, the power supply voltage regulating device of the embodiment of the present invention outputs an initial voltage of -1500V under default parameters, and by changing the voltage of the DC signal output by the DC-DC circuit 10, the power supply voltage regulation range can be -1500 to -2400V.

[0063] In a specific embodiment of the present invention, the driver U5 may be a UCC28C43MDREP driver.

[0064] A specific driver according to the embodiment of the present invention may also adopt a P-MOSFET (Metal Oxide Semiconductor Field Effect Transistor).

[0065] It should be noted that the embodiments of the present invention do not limit the models and parameters of the components, and the models and parameters of the components can be set according to actual needs.

[0066] In the power supply voltage regulating device 100 of the embodiment of the present invention, the feedback subcircuit 31 collects the DC signal of the third voltage (negative voltage) output by the boost subcircuit 21, converts the DC signal of the third voltage (negative voltage) to positive (positive voltage) and reduces it by a preset ratio, and outputs a DC signal of the fourth voltage. The single-chip computer 32 adjusts the duty cycle of the first PWM signal output by the PWM1 pin of the single-chip computer 32 in a step-by-step manner with a duty cycle of 1% according to the magnitude of the fourth voltage, and the regulating subcircuit 33 regulates the first PWM signal and outputs a DC signal of adjustable voltage. The larger the duty cycle of the first PWM signal, the larger the voltage of the DC signal output by the regulating subcircuit 33. As the DC voltage Uadj output by the regulating subcircuit 33 changes, based on the principle of the current mirror circuit of the regulating subcircuit 33, the current injected by the regulating subcircuit 33 to the FB pin of the DC-DC circuit 10 (the current extracted by the FB pin of the DC-DC circuit 10) also changes accordingly. That is, the larger the voltage of the DC signal output by the regulating subcircuit 33, the larger the current extracted by the FB pin of the DC-DC circuit 10.

[0067] The built-in feedback regulation logic of the DC-DC converter will increase the voltage output by the DC-DC converter to keep the FB pin voltage at 2.5 V when the extraction current increases. Conversely, when the extraction current decreases, the DC-DC output voltage decreases to maintain the FB pin voltage.

[0068] The change of the output voltage of the DC-DC circuit 10 is reflected by the change of the output negative high voltage (-1500V) through the boost circuit 20. Because the transformer parameters of the boost circuit 20 are fixed, the drive signal is fixed, and the secondary side boost multiple is fixed. When the output voltage of the DC-DC circuit 10 is boosted, the negative high voltage increases accordingly; otherwise, the negative high voltage decreases.

[0069] The power supply voltage regulating device of the embodiment of the present invention adopts the single-tube flyback and voltage doubling principle, adopts voltage feedback for regulation, the auxiliary input power supply adopts a DC-DC circuit, and the regulation circuit adopts the current mirror principle to regulate the current extracted from the feedback end of the DC-DC circuit.

[0070] The embodiment of the present invention uses a power supply voltage regulator to adjust the power supply output voltage according to complex working conditions in the well to meet the measurement requirements under different working conditions. The embodiment of the present invention can also reduce the ripple of the DC signal output by the boost circuit and improve the measurement accuracy.

[0071] The first PWM signal in the embodiment of the present invention is within a duty cycle adjustment range of 0 to 100%, which reflects that the adjustment range of the negative high voltage is -1500V to -2400V.

[0072] The power supply voltage regulating device of the embodiment of the present invention only needs to occupy two pins of a microcontroller unit (MCU) in practical applications, and does not require an additional power supply driver chip, thereby achieving the purpose of cost saving.

[0073] The invention provides a downhole instrument.

[0074] Figure 7 FIG. 1 is a schematic diagram of a downhole instrument according to an embodiment of the present invention. Figure 7 As shown, the downhole tool 1000 may include the power supply voltage regulating device 500 as described above.

[0075] The downhole instrument of the embodiment of the present invention can adjust the voltage of the DC signal output by the power supply under different working conditions to ensure the safety of the downhole instrument.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A power supply voltage regulating device, characterized in that: The device comprises: A DC-DC circuit, wherein an input end of the DC-DC circuit is connected to an output end of a power supply, and is used to convert a DC signal of a first voltage input by the power supply into a DC signal of a second voltage, wherein the first voltage is greater than the second voltage; a boost circuit, wherein an input end of the boost circuit is connected to an output end of the DC-DC circuit, and is used to boost the DC signal of the second voltage, and an output end of the boost circuit outputs a DC signal of a third voltage; A regulating circuit, wherein the input end of the regulating circuit is connected to the output end of the boost circuit, and the output end of the regulating circuit is connected to the feedback end of the DC-DC circuit, and is used to regulate the current injected into the feedback end of the DC-DC circuit according to the target voltage and the third voltage of the DC signal output by the boost circuit, so as to regulate the second voltage of the DC signal output by the DC-DC circuit, so that the voltage of the DC signal output by the boost circuit is adjusted to the target voltage.

2. The power supply voltage regulating device according to claim 1, characterized in that: The regulating circuit comprises: a feedback subcircuit, wherein the input end of the feedback subcircuit is connected to the input end of the regulating circuit, and is used to convert the DC signal of the third voltage into a positive signal and reduce it by a preset ratio, and output a DC signal of a fourth voltage; A single-chip microcomputer, wherein an ADC pin of the single-chip microcomputer is connected to the output end of the feedback subcircuit, and a PWM1 pin of the single-chip microcomputer is connected to the input end of the adjustment subcircuit, and is used to adjust the duty cycle of the first PWM signal output by the PWM1 pin of the single-chip microcomputer according to the DC signal of the fourth voltage; A regulating subcircuit, wherein the output end of the regulating subcircuit is connected to the output end of the regulating circuit, and is used to regulate the first PWM signal and output a DC signal with an adjustable voltage to regulate the second voltage of the DC signal output by the DC-DC circuit.

3. The power supply voltage regulating device according to claim 1, characterized in that: The boost circuit comprises: a boost subcircuit, wherein a first end of the boost subcircuit is connected to an input end of the boost circuit, and a second end of the boost subcircuit is connected to an output end of the boost circuit, and is used to boost the DC signal of the second voltage according to a preset boost multiple; A driving subcircuit, wherein the driving end of the boost subcircuit is connected to the first end of the driving subcircuit, and the second end of the driving subcircuit is connected to the PWM2 pin of the microcontroller, and is used to drive the boost subcircuit based on a second PWM signal with a preset frequency and a preset duty cycle input by the PWM2 pin of the microcontroller.

4. The power supply voltage regulating device according to claim 2, characterized in that: The feedback sub-circuit comprises a first resistor, a second resistor, a first operational amplifier, a third resistor, a fourth resistor, a first capacitor and a second operational amplifier, wherein the first end of the first resistor is connected to the input end of the feedback sub-circuit, the second end of the first resistor is connected to the negative phase end of the first operational amplifier through the second resistor, the positive phase end of the first operational amplifier is grounded, the output end of the first operational amplifier is connected to the negative phase end of the first operational amplifier through the third resistor and the fourth resistor in sequence, the voltage end of the first operational amplifier is connected to a power supply and forms a first node, the first node is grounded through the first capacitor, the output end of the first operational amplifier is connected to the positive phase end of the second operational amplifier, the output end of the second operational amplifier is connected to the output end of the feedback sub-circuit and forms a second node, and the second node is connected to the negative phase end of the second operational amplifier.

5. The power supply voltage regulating device according to claim 2, characterized in that: The regulating subcircuit includes a fifth resistor, a third operational amplifier, a second capacitor, a sixth resistor, a first transistor, and a second transistor. The first end of the fifth resistor is connected to the input end of the regulating subcircuit, the second end of the fifth resistor is connected to the positive phase end of the third operational amplifier to form a third node, the third node is grounded through the second capacitor, the power supply end of the third operational amplifier is connected to the power supply, the ground end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected to the first end of the sixth resistor to form a fourth node, the fourth node is connected to the negative phase end of the third operational amplifier, the second end of the sixth resistor is connected to the collector of the first transistor to form a fifth node, the emitter of the first transistor is grounded, the base of the first transistor is connected to the base of the second transistor to form a sixth node, the fifth node is connected to the sixth node, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the output end of the regulating subcircuit.

6. The power supply voltage regulating device according to claim 1, characterized in that: The DC-DC circuit includes: a DC-DC converter, a third capacitor, a fourth capacitor, a fifth capacitor, a seventh resistor, a sixth capacitor, a first inductor, an eighth resistor, a seventh capacitor, a ninth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor and a tenth resistor. The VIN1, VIN2 and EN pins of the DC-DC converter are connected to the input end of the DC-DC circuit to form a seventh node. The seventh node is grounded through the third capacitor, the SYNC pin of the DC-DC converter is grounded, the SS pin of the DC-DC converter is grounded through the fourth capacitor, the INTVCC pin of the DC-DC converter is grounded through the fifth capacitor, the RT pin of the DC-DC converter is grounded through the seventh resistor, the BST pin of the DC-DC converter is connected to the first end of the first inductor through the sixth capacitor, and the DC-DC converter The SW1, SW2, and SW3 pins of the DC-DC converter are all connected to the first end of the first inductor, the BIAS pin of the DC-DC converter is connected to the second end of the first inductor, the FB pin of the DC-DC converter is connected to the first end of the eighth resistor to form an eighth node, the eighth node is connected to the feedback end of the DC-DC circuit, the eighth node is grounded through the ninth resistor, the PAD and GND pins of the DC-DC converter are grounded, the second end of the eighth resistor is connected to the second end of the first inductor, the eighth resistor is connected in parallel with the seventh capacitor, the second end of the first inductor is respectively connected to the first ends of the eighth capacitor, the ninth capacitor and the tenth capacitor, the second ends of the eighth capacitor, the ninth capacitor and the tenth capacitor are grounded, and the first end of the tenth capacitor is connected to the output end of the DC-DC circuit through the tenth resistor.

7. The power supply voltage regulating device according to claim 3, characterized in that: The boost subcircuit comprises: a transformer, an eleventh capacitor, a first diode, a twelfth capacitor, a second diode, a thirteenth capacitor, a third diode, a fourteenth capacitor, a fourth diode, a fifteenth capacitor, a fifth diode, a sixteenth capacitor, a sixth diode and an eleventh resistor, wherein the first pin of the transformer is connected to the first end of the boost subcircuit, the fourth pin of the transformer is connected to the driving end of the boost subcircuit, the third pin of the transformer is grounded, the fifth pin of the transformer is connected to the positive electrode of the first diode through the eleventh capacitor, the negative electrode of the first diode is grounded, the negative electrode of the first diode is connected to the positive electrode of the second diode through the twelfth capacitor, and the negative electrode of the second diode is connected to the driving end of the boost subcircuit. The thirteenth capacitor is connected to the anode of the third diode, the cathode of the third diode is connected to the anode of the second diode, the cathode of the third diode is connected to the anode of the fourth diode through the fourteenth capacitor, the cathode of the fourth diode is connected to the anode of the third diode, the cathode of the fourth diode is connected to the anode of the fifth diode through the fifteenth capacitor, the cathode of the fifth diode is connected to the anode of the fourth diode, the cathode of the fifth diode is connected to the anode of the sixth diode through the sixteenth capacitor, the cathode of the sixth diode is connected to the anode of the fifth diode, and the anode of the sixth diode is connected to the second end of the boost sub-circuit through the eleventh resistor.

8. The power supply voltage regulating device according to claim 3, characterized in that: The driving subcircuit includes a driver, a twelfth resistor and a thirteenth resistor, the gate of the driver is connected to the second end of the driving subcircuit through the twelfth resistor, the drain of the driver is connected to the first end of the driving subcircuit, and the source of the driver is grounded through the thirteenth resistor.

9. The power supply voltage regulating device according to claim 6, characterized in that: The DC-DC converter has built-in feedback regulation logic.

10. A downhole instrument, characterized in that: The invention comprises a power supply voltage regulating device as claimed in any one of claims 1 to 9.

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