Switching circuit and exploring tube equipment

Abstract

The utility model discloses a switching circuit and probe equipment, and the circuit comprises a resistor unit, the input end of which is connected with a power supply; the input end of the power-on slow start unit is connected with the output end of the resistor unit, the output end of the power-on slow start unit is connected with a load circuit, and the power-on slow start unit comprises a first capacitor, a first resistor, a first switch tube, a second resistor, a first triode and a third resistor. The first resistor and the first end of the first capacitor are connected with the input end of the power-up slow start unit, the second end of the first capacitor is connected with the second end of the first resistor, the source electrode of the first switch tube is connected with the first end of the first capacitor, and the drain electrode of the first switch tube is connected with the output end of the power-up slow start unit. The second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the grid electrode of the first switch tube, the second end of the first resistor is connected with the collector electrode of the first triode, and the emitter electrode of the first triode is grounded through the third resistor.

Description

Technical Field

[0001] This utility model relates to the field of downhole equipment technology, and in particular to a switching circuit and a probe device. Background Technology

[0002] When working in a probe well, it must be used in conjunction with an azimuth gamma ray or near-drilling system to detect geological information in real time and ensure the drilling direction of the drill bit. Since the azimuth gamma ray or near-drilling system is powered by the probe, and the instrument at the lower end of the probe is a capacitive load, a large current will flow through it at the moment of power-on, which may burn out the battery. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a switching circuit that supplies power to the instrument at the lower end of the probe by slowly applying power, effectively preventing battery burnout.

[0004] The second objective of this invention is to provide a probe device.

[0005] To achieve the above objectives, a first aspect of this utility model provides a switching circuit, comprising: a resistor unit, the input terminal of which is connected to a power supply; and a power-on soft-start unit, the input terminal of which is connected to the output terminal of the resistor unit, and the output terminal of which is connected to a load circuit. The power-on soft-start unit includes a first capacitor, a first resistor, a first switching transistor, a second resistor, a first transistor, and a third resistor. The first resistor and the first capacitor have their first ends connected to the input terminal of the power-on soft-start unit. The second end of the first capacitor is connected to the second end of the first resistor. The source of the first switching transistor is connected to the first end of the first capacitor. The drain of the first switching transistor is connected to the output terminal of the power-on soft-start unit. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is connected to the gate of the first switching transistor. The second end of the first resistor is connected to the collector of the first transistor. The emitter of the first transistor is grounded through the third resistor.

[0006] According to the switching circuit of this utility model embodiment, after the probe is powered on and working normally, the first switching transistor is slowly turned on under the action of the first capacitor in the power-on slow-start unit. By slowly powering on, power is supplied to the instrument at the lower end of the probe, effectively preventing the battery from burning out.

[0007] In addition, the switching circuit proposed according to the above embodiments of this utility model may also have the following additional technical features:

[0008] According to one embodiment of the present invention, the circuit includes: an overcurrent protection unit, a first terminal of the overcurrent protection unit connected to the input terminal of the resistor unit, a second terminal of the overcurrent protection unit connected to the output terminal of the resistor unit, and a control terminal of the overcurrent protection unit connected to the base of the first transistor.

[0009] According to one embodiment of the present invention, the overcurrent protection unit includes: an overcurrent detection subunit, the first end of which is connected to the first end of the overcurrent protection unit, and the second end of which is connected to the second end of the overcurrent protection unit; and a microcontroller, the input end of which is connected to the third end of the overcurrent detection subunit, and the output end of which is connected to the control end of the overcurrent protection unit.

[0010] According to one embodiment of the present invention, the overcurrent detection subunit includes: a second transistor, a fourth resistor, a fifth resistor, a second switch, a sixth resistor, and a DC voltage source. The emitter of the second transistor is connected to a first terminal of the overcurrent detection subunit, the base of the second transistor is connected to a second terminal of the overcurrent detection subunit, the collector of the second transistor is connected to a first terminal of the fourth resistor, the second terminal of the fourth resistor is connected to a first terminal of the fifth resistor, the second terminal of the fifth resistor is grounded, the second terminal of the fourth resistor is connected to the gate of the second switch, the source of the second switch is grounded, the drain of the second switch is connected to the DC voltage source through the sixth resistor, and the drain of the second switch is connected to a third terminal of the overcurrent detection subunit.

[0011] According to one embodiment of the present invention, the overcurrent detection subunit further includes a second capacitor, the first end of the second capacitor being connected to the second end of the fourth resistor, and the second end of the second capacitor being connected to the second end of the fifth resistor.

[0012] According to one embodiment of the present invention, the resistor unit includes a seventh resistor and an eighth resistor, the first ends of the seventh resistor and the eighth resistor are connected to the input terminal of the resistor unit, and the second ends of the seventh resistor and the eighth resistor are connected to the output terminal of the resistor unit.

[0013] According to one embodiment of the present invention, the seventh resistor and the eighth resistor have the same resistance value.

[0014] According to one embodiment of the present invention, the first switching transistor is a PMOS transistor, and the first transistor is an NPN transistor.

[0015] According to one embodiment of the present invention, the second transistor is a PNP transistor, and the second switching transistor is an NMOS transistor.

[0016] To achieve the above objectives, a second aspect of this utility model provides a probe device, including a switching circuit as described in the first aspect of this utility model.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a switching circuit according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a switching circuit according to another embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a switching circuit according to a specific embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a probe device according to an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] The switching circuit and probe device of this utility model embodiment will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] Figure 1 This is a schematic diagram of a switching circuit according to an embodiment of the present invention. Figure 1 As shown, the switching circuit 100 may include:

[0025] Resistor unit 10, the input terminal of resistor unit 10 is connected to the power supply;

[0026] The power-on soft-start unit 20 has its input terminal connected to the output terminal of the resistor unit 10 and its output terminal connected to the load circuit. The power-on soft-start unit 20 includes a first capacitor C1, a first resistor R1, a first switch Q1, a second resistor R2, a first transistor Q2, and a third resistor R3. The first terminals of the first capacitor C1 and the first resistor R1 are connected to the input terminal of the power-on soft-start unit 20. The second terminal of the first capacitor C1 is connected to the second terminal of the first resistor R1 and the first terminal of the first switch Q1. The drain of the first switch Q1 is connected to the output terminal of the power-on soft-start unit 20. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the second terminal of the second resistor R2 is connected to the gate of the first switch Q1. The second terminal of the first resistor R1 is connected to the collector of the first transistor Q2. The emitter of the first transistor Q2 is grounded through the third resistor R3.

[0027] In one embodiment of this utility model, the first switching transistor Q1 is a PMOS transistor, and the first transistor Q2 is an NPN transistor.

[0028] Since the instrument at the lower end of the probe is a capacitive load, a large current will flow through it at the moment of power-on. To protect the battery and prevent it from burning out due to excessive instantaneous current, the switching circuit 100 of this embodiment of the invention includes a resistor unit 10 and a power-on soft-start unit 20. After the probe is powered on and operating normally, the current in the resistor unit 10 in the switching circuit 100, under the action of the first capacitor C1 in the power-on soft-start unit 20, slowly turns on the first switching transistor Q1, thus supplying power to the instrument at the lower end of the probe through a slow power-on process.

[0029] Specifically, after the probe is powered on and operating normally, the base voltage OC_EN of the first transistor Q2 is pulled high, turning on Q2. Current flows through the second resistor R2. Under the influence of the first capacitor C1, the voltage across the second resistor R2 slowly exceeds the threshold voltage VGS (Gate-Source Voltage) of the first switching transistor Q1, turning on Q1 and outputting 24V to the downstream device. Due to the presence of the first capacitor C1, the first switching transistor Q1 turns on slowly, achieving a slow power-on effect.

[0030] In this embodiment of the present invention, after the probe is powered on and working normally, the current in the resistor unit 10 in the switching circuit 100 is slowly turned on by the first capacitor C1 in the power-on slow-start unit 20, and the first switch tube Q1 is slowly turned on, so as to supply power to the instrument at the lower end of the probe through the slow power-on.

[0031] In one embodiment of this utility model, such as Figure 2 As shown, the switching circuit 100 may include:

[0032] The overcurrent protection unit 30 has its first terminal connected to the input terminal of the resistor unit 10, its second terminal connected to the output terminal of the resistor unit 10, and its control terminal connected to the base of the first transistor Q2.

[0033] Since the power supply for the azimuth gamma or near-drilling system is provided by the probe, if the probe encounters a short circuit in the lower instrument, the power supply to the lower instrument must be cut off to ensure the probe's own operation. This embodiment of the invention includes an overcurrent protection unit 30 that detects the current passing through the resistor unit 10 and, upon determining an overcurrent, controls the switching circuit 100 to stop supplying power to the load circuit.

[0034] Specifically, the overcurrent protection unit 30 detects the real-time current through the resistor unit 10. When it is determined that the real-time current through the resistor unit 10 is greater than the preset threshold, in order to ensure the operation of the probe itself, the power supply to the lower instrument needs to be cut off. In this embodiment of the invention, the power supply to the lower instrument is cut off by pulling down the base voltage OC_EN level of the first transistor Q2.

[0035] In one embodiment of this utility model, such as Figure 2 As shown, the overcurrent protection unit 30 may include:

[0036] The overcurrent detection subunit 31 has its first terminal connected to the first terminal of the overcurrent protection unit 30 and its second terminal connected to the second terminal of the overcurrent protection unit 30. The third terminal of the overcurrent detection subunit 31 outputs a low level when the real-time current through the resistor unit 10 is greater than a preset threshold.

[0037] The microcontroller 32 has its input terminal connected to the third terminal of the overcurrent detection subunit 31, and its output terminal connected to the control terminal of the overcurrent protection unit 30. When the overcurrent detection subunit 31 outputs a low level, the microcontroller pulls down the base level of the first transistor Q2.

[0038] Specifically, the overcurrent detection subunit 31 detects the current passing through the resistor unit 10. When the real-time current passing through the resistor unit 10 exceeds a preset threshold, the third terminal OC_FLAG of the overcurrent detection subunit 31 outputs a low level. When the microcontroller 32 detects that the third terminal of the overcurrent detection subunit 31 outputs a low level, it pulls down the base level of the first transistor Q2, cutting off the power supply from the switching circuit 100 to the load circuit.

[0039] In one embodiment of this utility model, such as Figure 3As shown, the overcurrent detection subunit 31 includes: a second transistor Q3, a fourth resistor R4, a fifth resistor R5, a second switch Q4, a sixth resistor R6, and a DC voltage source. The emitter of the second transistor Q3 is connected to the first terminal of the overcurrent detection subunit 31, the base of the second transistor Q3 is connected to the second terminal of the overcurrent detection subunit 31, the collector of the second transistor Q3 is connected to the first terminal of the fourth resistor R4, the second terminal of the fourth resistor R4 is connected to the first terminal of the fifth resistor R5, the second terminal of the fifth resistor R5 is grounded, the second terminal of the fourth resistor R4 is connected to the gate of the second switch Q4, the source of the second switch Q4 is connected, the drain of the second switch Q4 is connected to the DC voltage source through the sixth resistor R6, and the drain of the second switch Q4 is connected to the third terminal of the overcurrent detection subunit 31.

[0040] In one embodiment of this utility model, the second transistor Q3 is a PNP transistor, and the second switching transistor Q4 is an NMOS transistor.

[0041] In one embodiment of this invention, a DC voltage source provides a +5V DC voltage.

[0042] In one embodiment of the present invention, the resistor unit includes a seventh resistor R7 and an eighth resistor R8. The first ends of the seventh resistor R7 and the eighth resistor R8 are connected to the input terminal of the resistor unit 10, and the second ends of the seventh resistor R7 and the eighth resistor R8 are connected to the output terminal of the resistor unit 10.

[0043] In one embodiment of this invention, the seventh resistor R7 and the eighth resistor R8 have the same resistance value. The resistance value of the seventh resistor R7 and the eighth resistor R8 is 0.5Ω.

[0044] Specifically, when the downstream instrument is short-circuited, the instantaneous current through resistor unit 10 increases, and the VBE (Base-Emitter Voltage, the voltage difference between the base and emitter) of the second transistor Q3 becomes 0.6V. The resistance of the seventh resistor R7 and the eighth resistor R8 after voltage division in parallel is 0.25Ω. When the voltage across the seventh resistor R7 exceeds 0.6V (i.e., the downstream output current exceeds 2.4A), the second transistor Q3 turns on, and the voltage at the collector of the second transistor Q3 changes from 0V to 24V. After this voltage is divided by the fourth resistor R4 and the fifth resistor R5, the drain voltage of the second switch Q4 becomes 4V, which exceeds the threshold voltage of the second switch Q4. The second switch Q4 turns on, and the voltage OC_FLAG at the third terminal of the current detection subunit 31 changes from high level to low level.

[0045] When the microcontroller 32 detects that the voltage OC_FLAG at the third terminal of the current detection subunit 31 is low, it pulls down the base voltage OC_EN of the first transistor Q2 to shut down the power supply to the back-end instrument, thereby achieving the overcurrent protection function.

[0046] In a specific embodiment of this utility model, the microcontroller 32 can be an S912ZVCA19FOWKH microcontroller. The third terminal of the overcurrent detection subunit 31 is connected to the PP4 pin of the S912ZVCA19FOWKH microcontroller, and the control terminal of the overcurrent protection unit 30 is connected to the PP1 pin of the S912ZVCA19FOWKH microcontroller. That is, the drain (OC_FLAG) of the second switching transistor Q4 is connected to the PP4 pin of the S912ZVCA19FOWKH microcontroller, and the base (OC_EN) of the first transistor Q2 is connected to the PP1 pin of the S912ZVCA19FOWKH microcontroller.

[0047] In one embodiment of the present invention, the overcurrent detection subunit 31 further includes a second capacitor C2, the first end of the second capacitor C2 being connected to the second end of the fourth resistor R4, and the second end of the second capacitor C2 being connected to the second end of the fifth resistor R5.

[0048] Specifically, the second capacitor C2 exists to eliminate spike signals generated by electromagnetic interference and to prevent the second switch Q4 from being mis-turned on, thus avoiding incorrect judgment by the microcontroller 32.

[0049] It should be noted that the embodiments of this utility model do not limit the model and parameters of each device, and can be set according to actual needs.

[0050] In this embodiment of the invention, after the probe is powered on and operating normally, the first switching transistor Q1 is slowly turned on by the first capacitor C1 in the power-on soft-start unit 20. This slow power-on provides power to the instrument at the lower end of the probe, preventing excessive instantaneous current from burning out the battery. The overcurrent detection subunit 31 detects the current passing through the resistor unit 10. When the real-time current of the resistor unit 10 exceeds a preset threshold, the microcontroller 32 pulls down the base level of the first transistor Q2, cutting off the power supply from the switching circuit 100 to the load circuit, thus providing overcurrent protection.

[0051] This utility model provides a probe device.

[0052] Figure 4 This is a schematic diagram of a probe device according to an embodiment of this utility model. Figure 4 As shown, the probe device 100 includes the switching circuit 100 as described above.

[0053] Specifically, the switching circuit 100 is disposed between the probe device 100 and the load circuit. The load circuit may be an azimuth gamma circuit or a near-drilling system circuit, etc.

[0054] The probe device of this embodiment utilizes the aforementioned switching circuit 100. After the probe is powered on and operating normally, the first switching transistor Q1 is slowly turned on under the action of the first capacitor C1 in the power-on soft-start unit 20. This slow power-on provides power to the instrument at the lower end of the probe, preventing excessive instantaneous current from burning out the battery. Furthermore, the overcurrent detection subunit 31 detects the current passing through the resistor unit 10. When the real-time current of the resistor unit 10 is determined to be greater than a preset threshold, the microcontroller 32 pulls down the base level of the first transistor Q2, cutting off the power supply from the switching circuit 100 to the load circuit, thus providing overcurrent protection.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A switching circuit, characterized in that, The circuit includes: A resistor unit, the input terminal of which is connected to a power supply; A power-on soft-start unit is provided, wherein the input terminal of the power-on soft-start unit is connected to the output terminal of the resistor unit, and the output terminal of the power-on soft-start unit is connected to the load circuit. The power-on soft-start unit includes a first capacitor, a first resistor, a first switching transistor, a second resistor, a first transistor, and a third resistor. The first resistor and the first capacitor have their first ends connected to the input terminal of the power-on soft-start unit. The second end of the first capacitor is connected to the second end of the first resistor. The source of the first switching transistor is connected to the first end of the first capacitor. The drain of the first switching transistor is connected to the output terminal of the power-on soft-start unit. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is connected to the gate of the first switching transistor. The second end of the first resistor is connected to the collector of the first transistor. The emitter of the first transistor is grounded through the third resistor.

2. The switching circuit according to claim 1, characterized in that, The circuit includes: An overcurrent protection unit is provided, wherein the first end of the overcurrent protection unit is connected to the input end of the resistor unit, the second end of the overcurrent protection unit is connected to the output end of the resistor unit, and the control end of the overcurrent protection unit is connected to the base of the first transistor.

3. The switching circuit according to claim 2, characterized in that, The overcurrent protection unit includes: An overcurrent detection subunit, wherein a first end of the overcurrent detection subunit is connected to a first end of the overcurrent protection unit, and a second end of the overcurrent detection subunit is connected to a second end of the overcurrent protection unit; A microcontroller is provided, with its input terminal connected to the third terminal of the overcurrent detection subunit and its output terminal connected to the control terminal of the overcurrent protection unit.

4. The switching circuit according to claim 3, characterized in that, The overcurrent detection subunit includes: a second transistor, a fourth resistor, a fifth resistor, a second switch, a sixth resistor, and a DC voltage source. The emitter of the second transistor is connected to the first terminal of the overcurrent detection subunit, the base of the second transistor is connected to the second terminal of the overcurrent detection subunit, the collector of the second transistor is connected to the first terminal of the fourth resistor, the second terminal of the fourth resistor is connected to the first terminal of the fifth resistor, the second terminal of the fifth resistor is grounded, the second terminal of the fourth resistor is connected to the gate of the second switch, the source of the second switch is grounded, the drain of the second switch is connected to the DC voltage source through the sixth resistor, and the drain of the second switch is connected to the third terminal of the overcurrent detection subunit.

5. The switching circuit according to claim 4, characterized in that, The overcurrent detection subunit further includes a second capacitor, the first end of which is connected to the second end of the fourth resistor, and the second end of which is connected to the second end of the fifth resistor.

6. The switching circuit according to claim 4, characterized in that, The resistor unit includes a seventh resistor and an eighth resistor. The first ends of the seventh resistor and the eighth resistor are connected to the input terminal of the resistor unit, and the second ends of the seventh resistor and the eighth resistor are connected to the output terminal of the resistor unit.

7. The switching circuit according to claim 6, characterized in that, The seventh resistor and the eighth resistor have the same resistance value.

8. The switching circuit according to claim 1, characterized in that, The first switching transistor is a PMOS transistor, and the first transistor is an NPN transistor.

9. The switching circuit according to claim 4, characterized in that, The second transistor is a PNP transistor, and the second switching transistor is an NMOS transistor.

10. A probe device, characterized in that, Includes the switching circuit as described in any one of claims 1-9.

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