CN204497993U - For the switching power circuit of intelligent drilling instrument - Google Patents
For the switching power circuit of intelligent drilling instrument Download PDFInfo
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- CN204497993U CN204497993U CN201520193472.3U CN201520193472U CN204497993U CN 204497993 U CN204497993 U CN 204497993U CN 201520193472 U CN201520193472 U CN 201520193472U CN 204497993 U CN204497993 U CN 204497993U
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Abstract
The utility model discloses a kind of switching power circuit for intelligent drilling instrument, rectification circuit one end after filter circuit is connected to the input of the armature winding of coupling coil by current foldback circuit ground connection, the other end and is connected to pwm control circuit by under-voltage protecting circuit, and current foldback circuit is also connected to pwm control circuit; The output of armature winding takes back the input of armature winding by C3 and diode D7, the output of the secondary winding of coupling coil is connected to voltage output end Vout by diode D8, and the input together ground connection also by C4 and secondary winding between diode D8 and voltage output end Vout; Voltage output end Vout is connected to pwm control circuit by R2, also by R3 ground connection between R2 and pwm control circuit; The drain electrode of metal-oxide-semiconductor is connected to the output of armature winding, and grid is connected to the output of pwm control circuit by resistance R1.The utility model effectively improves and exports galvanic stability.
Description
Technical field
The utility model relates to oil drilling equipment field, in particular to a kind of switching power circuit for intelligent drilling instrument.
Background technology
Along with the progress of science and technology, oil exploration, production technique are towards automation, intelligent direction sustainable development.Intelligent drilling instrument mostly is mechanical-electrical-hydraulic integration structure, adopts mud-pulse generator as AC power, by AC-DC-DC converting for downhole control system and electronic measuring instrument provide galvanic current pressure.Because the flowed fluctuation of drilling fluid in drilling well work is large, make generator speed unstable, cause the alternating voltage excursion of generation wider, cause the direct voltage be converted to there is larger fluctuation, adverse effect is caused to the steady operation of electronic control unit.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of switching power circuit for intelligent drilling instrument of electric current stable output.
Therefore, the technical solution of the utility model is as follows:
For a switching power circuit for intelligent drilling instrument, in described switching power circuit:
Rectification circuit one end after filter circuit is connected to the input of the armature winding of coupling coil by current foldback circuit ground connection, the other end and is connected to pwm control circuit by under-voltage protecting circuit, and described current foldback circuit is also connected to described pwm control circuit;
The output of described armature winding takes back the input of described armature winding by electric capacity C3 and diode D7, the output of the secondary winding of described coupling coil is connected to voltage output end Vout by diode D8, and also passes through the input together ground connection of electric capacity C4 and described secondary winding between diode D8 and described voltage output end Vout;
Described voltage output end Vout is connected to described pwm control circuit by resistance R2, also by resistance R3 ground connection between resistance R2 and described pwm control circuit;
The drain electrode of metal-oxide-semiconductor is connected to the output of described armature winding, grid is connected to the output of described pwm control circuit by resistance R1, source class is connected to described pwm control circuit by resistance R5 and by resistance R4 ground connection, also passes through electric capacity C5 ground connection between resistance R5 and described pwm control circuit;
Compare with reference voltage after described pwm control circuit is used for obtaining sampled voltage from described voltage output end Vout and obtain error signal; by the sample rate current obtained from described source class and described error signal being compared the duty ratio controlled to the described square-wave signal exported that drains, and also for continuing to described drain electrode output low level when the voltage that described under-voltage protecting circuit collects is less than threshold voltage or when the electric current that described current foldback circuit collects is greater than threshold current.
The switching power circuit for intelligent drilling instrument in the utility model, theoretical based on pulse-width modulation switching power supply, convert the threephase AC electric energy that mud-pulse generator produces to galvanic current can export, power for intelligent drilling instrument electronic control unit.
In the utility model, the three-phase alternating voltage that mud-pulse generator produces exports the armature winding place of coupling coil to after rectification circuit carries out full-wave rectification and filter circuit carries out capacitor filtering, pwm control circuit controls conducting and the shutoff of metal-oxide-semiconductor by the square-wave signal exporting certain dutyfactor value, the armature winding of coupling coil is made to carry out storage and the release of energy, reach the object controlling power supply and export, by output voltage sampling feedback circuit and current sample feedback circuit, pwm control circuit adopts the dutyfactor value of current control mode to square-wave signal to regulate, can export to obtain galvanic current, by under-voltage protecting circuit and current foldback circuit, ensure the normal work of switching power circuit, effectively improve and export galvanic stability, thus improve the reliability of equipment work.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the switching power circuit for intelligent drilling instrument according to the utility model embodiment;
Fig. 2 is according to voltage waveform comparison diagram on the pwm control circuit output pulse waveform in the switching power circuit of intelligent drilling instrument of the utility model embodiment and metal-oxide-semiconductor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
As shown in Figure 1, according to the switching power circuit for intelligent drilling instrument of embodiment of the present utility model, in described switching power circuit:
Rectification circuit one end after filter circuit is connected to the input of the armature winding of coupling coil by current foldback circuit ground connection, the other end and is connected to pwm control circuit by under-voltage protecting circuit, and described current foldback circuit is also connected to described pwm control circuit;
The output of described armature winding takes back the input of described armature winding by electric capacity C3 and diode D7, the output of the secondary winding of described coupling coil is connected to voltage output end Vout by diode D8, and also passes through the input together ground connection of electric capacity C4 and described secondary winding between diode D8 and described voltage output end Vout;
Described voltage output end Vout is connected to described pwm control circuit by resistance R2, also by resistance R3 ground connection between resistance R2 and described pwm control circuit;
The drain D of metal-oxide-semiconductor Q1 is connected to the output of described armature winding, grid G is connected to the output of described pwm control circuit by resistance R1, source class S is connected to described pwm control circuit by resistance R5 and by resistance R4 ground connection, also passes through electric capacity C5 ground connection between resistance R5 and described pwm control circuit;
Compare with reference voltage after described pwm control circuit is used for obtaining sampled voltage from described voltage output end Vout and obtain error signal; by the sample rate current obtained from described source class S and described error signal are compared the duty ratio controlling the square-wave signal exported to described drain D, and also for continuing to described drain D output low level when the voltage that described under-voltage protecting circuit collects is less than threshold voltage or when the electric current that described current foldback circuit collects is greater than threshold current.
The switching power circuit for intelligent drilling instrument in the utility model, theoretical based on pulse-width modulation switching power supply, convert the threephase AC electric energy that mud-pulse generator produces to galvanic current can export, power for intelligent drilling instrument electronic control unit.
The alternating current that mud-pulse generator produces exports direct current at Vlin end after rectification circuit and filter circuit, pwm control circuit 10 is by regulating the output pulse signal dutyfactor value in one-period, control conducting and the shutoff of metal-oxide-semiconductor Q1, convert the direct current energy that Vlin end exports to high-frequency ac electric energy, be stored in coupling coil 4.Coupling coil 4 comprises armature winding 41, secondary winding 42 and magnetic core, for the high-frequency ac electric energy be stored in armature winding being passed to secondary winding 42 place within the metal-oxide-semiconductor Q1 turn-off time, diode D8 and electric capacity C4 forms pick up mechanism 5, high-frequency ac electric energy for being exported by secondary winding 42 converts galvanic current to can export Vout end to, for intelligent drilling instrument electronic control unit provides galvanic current source.Sampling feedback circuit comprises the output voltage sampling feedback circuit 8 be made up of R2, R3 and the sample rate current feedback circuit 9 be made up of R5, C5, and pwm control circuit 10 pairs of feedback voltages and feedback current carry out com-parison and analysis, with regulation output pulse signal dutyfactor value.Protective circuit comprises under-voltage protecting circuit 6 and current foldback circuit 7; monitor for the direct voltage that exports rectification circuit and filter circuit and loop current; export pwm control circuit 10 to, carry out analysis decision, to judge whether to carry out electric energy transfer process for it.
In the utility model, ee Switching Power Supply is the isolated anti exciting converter structure of voltage-dropping type, input and output carry out electrical isolation by coupling coil 4, armature winding 41 storage power of coupling coil 4 in metal-oxide-semiconductor Q1 ON time, within the eeMOS pipe Q1 turn-off time, coupling coil 4 transfers its energy to secondary winding end 42, and output voltage is lower than input voltage.
Pwm control circuit 10 is current control mode, by sampling to the current signal on metal-oxide-semiconductor Q1, comparing, error amplify, in order to regulate the armature winding 411 peak current tracking error change in voltage of coupling coil 4, form Double Loop Control System with output voltage feedback circuit 8, thus indirectly control the dutyfactor value exporting pulse.
The threephase AC electric energy that mud-pulse generator 1 produces carries out full-wave rectification by the diode D1-D6 in rectification circuit 2, and after carrying out capacitor filtering by electric capacity C1, the C2 in filter circuit 3, output dc voltage Vlin is to armature winding 41 side of coupling coil 4; Pwm control circuit 10 exports the square-wave signal of certain dutyfactor value, the grid G of metal-oxide-semiconductor Q1 is exported to through resistance R1, when pwm control circuit 10 exports high level, metal-oxide-semiconductor Q1 conducting, Vlin forms charge circuit, armature winding 41 energy storage of coupling coil 4 through the armature winding 41 of coupling coil 4, metal-oxide-semiconductor Q1, resistance R4; When pwm control circuit 10 output low level, metal-oxide-semiconductor Q1 turns off, Vlin is through armature winding 41, electric capacity C3 and the diode D7 formation discharge loop of coupling coil 4, the electrical energy transfer stored in the armature winding 41 of coupling coil 4 is to secondary winding 42 side of coupling coil 4, unidirectional halfwave rectifier is carried out by the diode D8 of pick up mechanism 5, after carrying out capacitor filtering by the electric capacity C4 of pick up mechanism 5, export 12V direct voltage Vout.
The resistance R2 of output voltage Vout in voltage sample feedback circuit 8, pwm control circuit 10 is entered after R3 dividing potential drop, compare with the reference voltage in pwm control circuit 10, error is amplified, to be sampled through the resistance R5 in current sample feedback circuit by the electric current of metal-oxide-semiconductor Q1 and enter pwm control circuit 10 after carrying out filtering by electric capacity C5, compare with Voltage Feedback error signal in pwm control circuit 10, after amplification, for the dutyfactor value regulating pwm control circuit 10 to export square-wave signal, thus the conducting controlled in metal-oxide-semiconductor Q1 each cycle and turn-off time, reach the object controlling power supply and export.
After under-voltage protecting circuit 6 couples of Vlin carry out dividing potential drop sampling; after comparing with the reference voltage in under-voltage protecting circuit 6; send into pwm control circuit 10; when Vlin is greater than the threshold voltage of setting; pwm control circuit 10 normally exports the square-wave signal of certain dutyfactor value, and coupling coil 4 carries out electric energy conversion, when Vlin is less than the threshold voltage of setting; pwm control circuit 10 exports as low level, and coupling coil 4 stops electric energy changing.Current foldback circuit 7 is by carrying out current sample to loop current; through amplify, relatively after enter pwm control circuit 10; when loop current is less than the threshold current of setting; pwm control circuit 10 normally exports the square-wave signal of certain dutyfactor value; coupling coil 4 carries out electric energy conversion; when loop current is greater than the threshold current of setting, pwm control circuit 10 exports as low level, and coupling coil 4 stops electric energy changing.
As shown in Figure 2,110 is the voltage waveform between the drain electrode of metal-oxide-semiconductor Q1 and signal ground, and 210 is the voltage waveform between the grid G of metal-oxide-semiconductor Q1 and signal ground, i.e. the square-wave signal waveform of pwm control circuit 10 output.Export in the one-period T of square-wave signal at pwm control circuit 10, Ton is high level lasting time, and Toff is low duration, and dutyfactor value is Ton/T.When square-wave signal is high level, metal-oxide-semiconductor Q1 conducting, drain voltage declines, and is raised, armature winding 41 energy storage by the current value of the armature winding 41 of coupling coil 4, when square-wave signal is high level, metal-oxide-semiconductor Q1 turns off, drain D voltage rise, is reduced by the current value of the armature winding 41 of coupling coil 4, energy transferring in armature winding 41, in secondary winding 42, exports 12V direct voltage after pick up mechanism 5.
In the utility model, the three-phase alternating voltage that mud-pulse generator produces exports armature winding 41 place of coupling coil 4 to after rectification circuit 2 carries out full-wave rectification and filter circuit 3 carries out capacitor filtering, pwm control circuit 10 controls conducting and the shutoff of metal-oxide-semiconductor Q1 by the square-wave signal exporting certain dutyfactor value, the armature winding 41 of coupling coil 4 is made to carry out storage and the release of energy, reach the object controlling power supply and export, by output voltage sampling feedback circuit 8 and current sample feedback circuit 9, pwm control circuit 10 adopts the dutyfactor value of current control mode to square-wave signal to regulate, can export to obtain galvanic current, by under-voltage protecting circuit 6 and current foldback circuit 7, ensure the normal work of switching power circuit, effectively improve and export galvanic stability, thus improve the reliability of equipment work.
In sum, content of the present utility model is not limited in the above-described embodiment, and those skilled in the art can propose other embodiment within technological guidance's thought of the present utility model, but this embodiment is all included within scope of the present utility model.
Claims (1)
1. for a switching power circuit for intelligent drilling instrument, it is characterized in that, in described switching power circuit:
Rectification circuit (2) one end after filter circuit (3) is connected to the input of the armature winding (41) of coupling coil (4) and is connected to pwm control circuit (10) by under-voltage protecting circuit (6) by current foldback circuit (7) ground connection, the other end, described current foldback circuit (7) is also connected to described pwm control circuit (10);
The output of described armature winding (41) takes back the input of described armature winding (41) by electric capacity C3 and diode D7, the output of the secondary winding (42) of described coupling coil (4) is connected to voltage output end Vout by diode D8, and also passes through the input together ground connection of electric capacity C4 and described secondary winding (42) between diode D8 and described voltage output end Vout;
Described voltage output end Vout is connected to described pwm control circuit (10) by resistance R2, also by resistance R3 ground connection between resistance R2 and described pwm control circuit (10);
The drain electrode (D) of metal-oxide-semiconductor Q1 is connected to the output of described armature winding (41), grid (G) is connected to the output of described pwm control circuit (10) by resistance R1, source class (S) is connected to described pwm control circuit (10) by resistance R5 and by resistance R4 ground connection, also passes through electric capacity C5 ground connection between resistance R5 and described pwm control circuit (10);
Described pwm control circuit (10) obtains error signal for comparing with reference voltage after obtaining sampled voltage from described voltage output end Vout; by the sample rate current obtained from described source class (S) and described error signal being compared the duty ratio of the square-wave signal controlling to export to described drain electrode (D), and also for continuing to described drain electrode (D) output low level when the voltage that described under-voltage protecting circuit (6) collects is less than threshold voltage or when the electric current that described current foldback circuit (7) collects is greater than threshold current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193472.3U CN204497993U (en) | 2015-04-01 | 2015-04-01 | For the switching power circuit of intelligent drilling instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193472.3U CN204497993U (en) | 2015-04-01 | 2015-04-01 | For the switching power circuit of intelligent drilling instrument |
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| Publication Number | Publication Date |
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| CN204497993U true CN204497993U (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520193472.3U Expired - Fee Related CN204497993U (en) | 2015-04-01 | 2015-04-01 | For the switching power circuit of intelligent drilling instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734518A (en) * | 2015-04-01 | 2015-06-24 | 中国石油集团渤海钻探工程有限公司 | Switching power supply circuit for intelligent drilling tool |
-
2015
- 2015-04-01 CN CN201520193472.3U patent/CN204497993U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734518A (en) * | 2015-04-01 | 2015-06-24 | 中国石油集团渤海钻探工程有限公司 | Switching power supply circuit for intelligent drilling tool |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210204 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106 Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 |