CN105450003B - A kind of voltage-stabilized power supply shock absorbing circuit - Google Patents
A kind of voltage-stabilized power supply shock absorbing circuit Download PDFInfo
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- CN105450003B CN105450003B CN201610019738.1A CN201610019738A CN105450003B CN 105450003 B CN105450003 B CN 105450003B CN 201610019738 A CN201610019738 A CN 201610019738A CN 105450003 B CN105450003 B CN 105450003B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Rectifiers (AREA)
Abstract
A kind of voltage-stabilized power supply shock absorbing circuit.It includes three phase rectifier filter circuit, n voltage-stabilized power supply and shock absorbing circuit, wherein：The input of three phase rectifier filter circuit is connected with mud turbine generator, the output end of three phase rectifier filter circuit is connected with the input of n voltage-stabilized power supply simultaneously, the output end of n voltage-stabilized power supply is connected with n load respectively, and shock absorbing circuit is connected with the output end of three phase rectifier filter circuit.The beneficial effect of voltage-stabilized power supply shock absorbing circuit provided by the invention is, by setting up shock absorbing circuit in the output end of three phase rectifier filter circuit, the voltage-stabilized power supply output voltage caused by mud turbine generator vibration caused by loading change and step-out can be effectively eliminated to fluctuate, the safe and stable operation with electric loading can be ensured, effectively lift the integral working of intelligent drilling instrument.
Description
Technical field
The invention belongs to oil, gas drilling technical field, more particularly to a kind of voltage-stabilized power supply shock absorbing circuit.
Background technology
The intelligent drilling instrument being powered using mud turbine generator, by voltage-stabilized power supply by mud turbine generator
Caused wide scope three-phase low-frequency ac can be converted into the stable DC electric energy for meeting different loads demand.
It can regard as between the magnetic pole of the stator and rotor magnetic pole of mud turbine generator and mutually be interconnected by the flexible magnetic line of force
System, when the load increases, generator rotor angle increase, elongated equivalent to the magnetic line of force, when the load decreases, generator rotor angle reduces, equivalent to the magnetic line of force
Shorten, when load changes suddenly, due to the inertia of rotor, rotor generator rotor angle can not be stablized in new numerical value immediately, but
By swinging several times near new stationary value, vibration is produced.If the amplitude of vibration is increasing, generator rotor angle constantly increases,
Until abjection stability range, it will the step-out of mud turbine generator is caused, so as to have a strong impact on intelligent drilling instrument electronics control
The normal work of unit processed, or even cause burning for electronic component.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of voltage-stabilized power supply shock absorbing circuit.
In order to achieve the above object, voltage-stabilized power supply shock absorbing circuit provided by the invention includes：Three phase rectifier filter circuit, n
Individual voltage-stabilized power supply and shock absorbing circuit, wherein：The input of three phase rectifier filter circuit is connected with mud turbine generator, three-phase is whole
The output end for flowing filter circuit is connected with the input of n voltage-stabilized power supply simultaneously, and the output end of n voltage-stabilized power supply is individual with n respectively
Load is connected, and shock absorbing circuit is connected with the output end of three phase rectifier filter circuit.
Described shock absorbing circuit includes signal extracting circuit, low-pass filter circuit, threshold value comparison circuit and resistance weakening electricity
Road；Described signal extracting circuit includes：Resistance R1-R5, electric capacity C1 and differential operational amplifier U1；Three phase rectifier filter circuit
The thick DC voltage V of outputin, first via input difference operational amplifier U1 after resistance R1 and resistance R2 partial pressures input in the same direction
End, electric capacity C1 are used to filter out thick DC voltage VinIn radio-frequency component, after secondary route resistance R3 and resistance R4 partial pressures, through electric capacity
C2 obtains its alternating component and input difference operational amplifier U1 reverse input end, is exported after differential amplification to LPF
Circuit, R5 are differential operational amplifier U1 feedback resistance, and reverse input is connected to by differential operational amplifier U1 output end
End；Low-pass filter circuit uses 2 Shllen-Key low pass filter cascaded structures, i.e. k=2, it includes：Resistance R6-R9, electricity
Hold C3-C6, operational amplifier U2, U3；Wherein, operational amplifier U2, resistance R6, resistance R7, electric capacity C3 and electric capacity C4 compositions the
One Sallen-Key low pass filters, operational amplifier U3, resistance R8, resistance R9, electric capacity C5 and electric capacity C6 compositions second
Sallen-Key low pass filters, after signal extracting circuit output voltage LPF, export to threshold value comparison circuit；Threshold value
Comparison circuit uses differential operational amplifier structure, and it includes：Resistance R10-R11, electric capacity C7 and differential operational amplifier U4；Its
In：In the same direction inputs of the DC reference voltage VDD1 through resistance R10 input difference operational amplifiers U4, DC offset voltage VDD2
Reverse input end through resistance R11 input difference operational amplifiers U4, threshold voltage VTDetermined by VDD1 and VDD2 value, low pass
The output voltage of filter circuit input difference operational amplifier U4 after electric capacity C7 reverse input end, is designated as VT1, R12 is feedback
Resistance, it is connected to from differential operational amplifier U4 output end to input, as voltage VT1＞ VTWhen, differential operational amplifier
U4 exports high level, as voltage VT1＜ VTWhen, differential operational amplifier U4 output low levels；Resistance shock absorbing circuit is by power device
Q1, weakening resistance R0 and resistance R13 compositions, wherein：Power device Q1 grid connects with differential operational amplifier U4 output end
Connect, drain be connected by weakening resistance R0 with the output end of three phase rectifier filter circuit, source electrode passes through resistance R13 and earth terminal and connected
Connect, when threshold circuit exports high level, the power device Q1 conductings of resistance shock absorbing circuit, the output of three phase rectifier filter circuit
Thick DC voltage VinEarth terminal is flowed into through shock absorbing circuit R0, power device Q1 and resistance R13, when threshold circuit exports low level
When, the power device Q1 shut-offs of resistance shock absorbing circuit, shock absorbing circuit R0 does not work.
The beneficial effect of voltage-stabilized power supply shock absorbing circuit provided by the invention is, by the defeated of three phase rectifier filter circuit
Go out end and set up shock absorbing circuit, can effectively eliminate steady caused by mud turbine generator vibration caused by loading change and step-out
Voltage source output voltage fluctuates, it is ensured that with the overall work of the safe and stable operation of electric loading, effectively lifting intelligent drilling instrument
Make performance.
Brief description of the drawings
Fig. 1 is voltage-stabilized power supply shock absorbing circuit structural representation provided by the invention.
Fig. 2 is this voltage-stabilized power supply shock absorbing circuit damper principle figure.
Fig. 3 is the waveform figure of this voltage-stabilized power supply shock absorbing circuit pin output.
Fig. 4 is waveform figure of this voltage-stabilized power supply shock absorbing circuit under different test conditions.
Embodiment
Voltage-stabilized power supply shock absorbing circuit provided by the invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, voltage-stabilized power supply shock absorbing circuit provided by the invention includes：
Three phase rectifier filter circuit 21, n voltage-stabilized power supply 31 and shock absorbing circuit 51, wherein：Three phase rectifier filter circuit 21
Input be connected with mud turbine generator 11, the output end of three phase rectifier filter circuit 21 simultaneously with n voltage-stabilized power supply 31
Input connection, the output end of n voltage-stabilized power supply 31 loads 41 with n respectively and is connected, shock absorbing circuit 51 and three phase rectifier
The output end of filter circuit 21 is connected.
Described three phase rectifier filter circuit 21 is used to change low-frequency ac electric energy caused by mud turbine generator 11
Into thick direct current energy；
Described n voltage-stabilized power supply 31 is used to be converted into the thick direct current energy of wide excursion to be adapted to different loads demand
Galvanic current energy, n is natural number more than 1；
Described shock absorbing circuit 51 is used to eliminate vibration and step-out caused by mud turbine generator 11, is internally provided with disappearing
Shake resistance；
The work of voltage-stabilized power supply shock absorbing circuit provided by the invention is：Low frequency ac caused by mud turbine generator 11
Thick direct current energy can be converted into through three phase rectifier filter circuit 21, then use the demand of electric loading 41 according to different by voltage-stabilized power supply 31
Being converted into galvanic current can export, and shock absorbing circuit 51 uses high-power resistance weakening pattern, from three phase rectifier filter circuit
AC ripple composition is extracted in 21 output voltage, the electricity of threshold condition is met by the weakening resistance absorption inside shock absorbing circuit 51
Pressure fluctuation.
Described shock absorbing circuit 51 includes signal extracting circuit 511, low-pass filter circuit 512, the and of threshold value comparison circuit 513
Resistance shock absorbing circuit 514, signal extracting circuit 511 extracted from the output voltage of three phase rectifier filter circuit 21 AC ripple into
Point, determine whether to meet weakening condition in threshold value comparison circuit 513 after low-pass filtered circuit 512, if condition meets, electricity
The weakening resistance performance in shock absorbing circuit 514 is hindered, is vibrated with eliminating caused by mud turbine generator 11.
In described voltage-stabilized power supply shock absorbing circuit, the signal extracting circuit 511 in shock absorbing circuit 51 uses calculus of differences
Amplifier architecture, the first end of described difference amplifier receive direct current in the output voltage of three phase rectifier filter circuit 21 into
Point, the second end of described difference amplifier receives the AC ripple composition in the output voltage of three phase rectifier filter circuit 21, institute
The first end for the difference amplifier stated is input in the same direction, and the second end is reverse input end.
In described voltage-stabilized power supply shock absorbing circuit, the low-pass filter circuit 512 in shock absorbing circuit 51 uses k second order
Sallen-Key low pass filters series connection structure, for filter out signal extracting circuit 511 output AC ripple voltage in
Radio-frequency component, k are the natural number more than or equal to 1.
In described voltage-stabilized power supply shock absorbing circuit, the threshold value comparison circuit 513 in shock absorbing circuit 51 uses calculus of differences
Amplifier architecture, the first end of difference amplifier receive DC reference voltage, and the second end of difference amplifier is adder structure,
It is made up of the output voltage of DC offset voltage and the low-pass filter circuit 512 of shock absorbing circuit, if meeting threshold condition, threshold value ratio
High level is exported compared with circuit 513, otherwise exports low level, the first end of described difference amplifier is input in the same direction, second
Hold as reverse input end.
In described voltage-stabilized power supply shock absorbing circuit, resistance shock absorbing circuit 514 is to be made up of power device and weakening resistance
Weakening control loop, by power device control weakening resistance realize weakening, the control signal of power device is compared with threshold value
The output end of circuit 513 is connected；In power device ON time, as caused by vibrating with step-out mud turbine generator 11
Fluctuation voltage is by weakening resistance absorption, and within the power device turn-off time, weakening resistance is stopped.
AC energy caused by mud turbine generator 11 through three phase rectifier filter circuit 21 carry out three phase full wave rectification and
After capacitor filtering, export to voltage-stabilized power supply 31, voltage-stabilized power supply 31 and be made up of n voltage-stabilized power supply, each voltage-stabilized power supply again may be by m
Individual voltage-stabilized power supply composes in parallel, and wherein n is natural number more than or equal to 1, and m is the natural number more than 1, and n and m numerical value is according to bearing
Carry power demand and determine that the input of shock absorbing circuit 51 is derived from the output end of three phase rectifier filter circuit 21, by signal extracting circuit
511, low-pass filter circuit 512, threshold value comparison circuit 513 and resistance shock absorbing circuit 514 form, wherein signal extracting circuit 511
For extracting the AC ripple composition in the output voltage of three phase rectifier filter circuit 21, second order is carried out by low-pass filter circuit 512
Output is to threshold value comparison circuit 513 after LPF, and when mud turbine generator 11 has vibration or step-out, threshold value is more electric
Road 513 exports high level, the power device conducting in resistance shock absorbing circuit 514, is vibrated by mud turbine generator 11 and step-out
Caused by AC ripple voltage by weakening resistance absorption, when 11 normal work of turbogenerator, in resistance shock absorbing circuit 514
Power device shut-off, weakening resistance is stopped.
As shown in Fig. 2 described signal extracting circuit 511 includes：Resistance R1-R5, electric capacity C1 and differential operational amplifier
U1；The thick DC voltage V that three phase rectifier filter circuit 21 exportsin, first via input difference after resistance R1 and resistance R2 partial pressures
Operational amplifier U1 input in the same direction, electric capacity C1 are used to filter out thick DC voltage VinIn radio-frequency component, secondary route resistance
After R3 and resistance R4 partial pressures, its alternating component and input difference operational amplifier U1 reverse input end, warp are obtained through electric capacity C2
Output is differential operational amplifier U1 feedback resistance to low-pass filter circuit 512, R5 after differential amplification, is amplified by calculus of differences
Device U1 output end is connected to reverse input end, and low-pass filter circuit 512 uses 2 Shllen-Key low pass filter tandem junctions
Structure, i.e. k=2, it includes：Resistance R6-R9, electric capacity C3-C6, operational amplifier U2, U3；Wherein, operational amplifier U2, resistance
R6, resistance R7, electric capacity C3 and electric capacity C4 form the first Sallen-Key low pass filters, operational amplifier U3, resistance R8, resistance
R9, electric capacity C5 and electric capacity C6 form the 2nd Sallen-Key low pass filters, to the output voltage low pass filtered of signal extracting circuit 511
After ripple, export to threshold value comparison circuit 513；Threshold value comparison circuit 513 uses differential operational amplifier structure, and it includes：Resistance
R10-R11, electric capacity C7 and differential operational amplifier U4；Wherein：DC reference voltage VDD1 is put through resistance R10 input difference computings
Big device U4 input in the same direction, reverse input ends of the DC offset voltage VDD2 through resistance R11 input difference operational amplifiers U4,
Threshold voltage VTDetermined by VDD1 and VDD2 value, the output voltage of low-pass filter circuit 512 input difference after electric capacity C7 is transported
Amplifier U4 reverse input end is calculated, is designated as VT1, R12 is feedback resistance, is connected to by differential operational amplifier U4 output end
Input in the same direction, as voltage VT1＞ VTWhen, differential operational amplifier U4 output high level, as voltage VT1＜ VTWhen, calculus of differences
Amplifier U4 exports low level；Resistance shock absorbing circuit 514 is made up of power device Q1, weakening resistance R0 and resistance R13, wherein：
Power device Q1 grid is connected with differential operational amplifier U4 output end, drains and filtered by weakening resistance R0 and three phase rectifier
The output end connection of wave circuit 21, source electrode are connected by resistance R13 with earth terminal, when threshold circuit 513 exports high level, electricity
Hinder the power device Q1 conductings of shock absorbing circuit 514, the thick DC voltage V that three phase rectifier filter circuit 21 exportsinThrough shock absorbing circuit
R0, power device Q1 and resistance R13 flow into earth terminal, when threshold circuit 513 exports low level, resistance shock absorbing circuit 514
Power device Q1 is turned off, and shock absorbing circuit R0 does not work.
As shown in figure 3, Fig. 3 (a) to Fig. 3 (h) is the shock absorbing circuit pin oscillogram that oscilloscope measurement obtains, wherein passage
1 is the thick DC voltage V of signal generator simulationinWaveform, passage 2 is respective pins voltage waveform, for analyzing shock absorbing circuit
Each several part working condition.In Fig. 3 (a), passage 2 is differential operational amplifier U1 input terminal voltage waveform in the same direction, in Fig. 3 (b),
Passage 2 is differential operational amplifier U1 reverse input end voltage waveform, and in Fig. 3 (c), passage 2 is differential operational amplifier U1
Output end voltage waveform, in Fig. 3 (d), passage 2 is operational amplifier U2 output end voltage waveform, in Fig. 3 (e), passage 2
For operational amplifier U3 output end voltage waveform, in Fig. 3 (f), reverse input end electricity that passage 2 is differential operational amplifier U4
Corrugating, in Fig. 3 (g), passage 2 is differential operational amplifier U4 output end voltage waveform, power when Fig. 3 (h) is high level
Voltage waveform between device Q1 grids and earth terminal.
As shown in figure 4, Fig. 4 (a) to Fig. 4 (f) is the shock absorbing circuit real work situation that oscilloscope measurement obtains, wherein,
Voltage signal ripple of the passage 1 between the grid and earth terminal of power device Q1 in the resistance shock absorbing circuit 514 of shock absorbing circuit 51
Shape figure, passage 2 are that low-frequency ac electric energy caused by mud turbine generator 11 is whole through the progress of three phase rectifier filter circuit 21 all-wave
The thick DC voltage V exported after stream and capacitor filteringinWaveform, Fig. 4 (a) is when connecing 1.5A Constant Current Loads, during system initial power-on
Thick DC voltage VinFluctuation cause shock absorbing circuit work situation, figure (b) for load from 1.5A be down to 0.2A when, load current become
Change causes thick DC voltage VinThe situation that shock absorbing circuit caused by fluctuation works, when Fig. 4 (c) is load current 0.2A, system is broken
Thick DC voltage V when electricinThe situation that shock absorbing circuit caused by fluctuation works, Fig. 4 (d) is thick DC voltage VinIn the presence of from exciting
The situation of caused shock absorbing circuit work when swinging, 3 passages are driving voltage when load is pulse signal generator in Fig. 4 (e),
When drive pulse signal generator works, load change causes thick DC voltage VinFluctuation reaches the work bar of shock absorbing circuit
Part, shock absorbing circuit are started working, oscillation-damped, and when Fig. 4 (f) is that system connects 0.2A Constant Current Load normal works, shock absorbing circuit stops
Only work.
During work, the range of speeds of mud turbine generator 11 is 2500rpm to 5500rpm, through three phase rectifier filtered electrical
The thick DC voltage V exported behind road 21inScope is 60V-160V, and shock absorbing circuit 51 is from thick DC voltage VinPlace's sampling, works as load
Change cause mud turbine generator 11 vibrate or step-out and cause thick DC voltage VinDuring fluctuation, shock absorbing circuit 51 works, by
Weakening resistance R0 thereon absorbs fluctuation voltage, and when 11 steady operation of mud turbine generator, shock absorbing circuit 51 is stopped,
The normal power supply and driving force of guarantee system other parts.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Voltage-stabilized power supply shock absorbing circuit provided by the invention is a kind of voltage-stabilized power supply shock absorbing circuit for intelligent drilling instrument,
For eliminating mud turbine generator vibration and step-out caused by load change, ensure the safe and stable output of voltage-stabilized power supply, can
Avoid influenceing the normal work of intelligent drilling instrument electronic control unit because of voltage pulsation.
Claims (1)
1. a kind of voltage-stabilized power supply shock absorbing circuit, described voltage-stabilized power supply shock absorbing circuit includes：Three phase rectifier filter circuit (21), n
Individual voltage-stabilized power supply (31) and shock absorbing circuit (51), wherein：The input of three phase rectifier filter circuit (21) generates electricity with slurry turbine
Machine (11) connection, the output end of three phase rectifier filter circuit (21) are connected with the input of n voltage-stabilized power supply (31) simultaneously, n
The output end of voltage-stabilized power supply (31) is connected with n load (41) respectively, shock absorbing circuit (51) and three phase rectifier filter circuit
(21) output end is connected；It is characterized in that：Described shock absorbing circuit (51) includes signal extracting circuit (511), low pass filtered
Wave circuit (512), threshold value comparison circuit (513) and resistance shock absorbing circuit (514)；Described signal extracting circuit (511) includes：
Resistance R1-R5, electric capacity C1 and differential operational amplifier U1；The thick DC voltage V of three phase rectifier filter circuit (21) outputin, the
All the way after resistance R1 and resistance R2 partial pressures input difference operational amplifier U1 input in the same direction, electric capacity C1 is used to filtering out thick straight
Flow voltage VinIn radio-frequency component, after secondary route resistance R3 and resistance R4 partial pressures, its alternating component and defeated is obtained through electric capacity C2
Enter differential operational amplifier U1 reverse input end, to low-pass filter circuit (512), R5 is difference fortune for output after differential amplification
Amplifier U1 feedback resistance is calculated, reverse input end, low-pass filter circuit are connected to by differential operational amplifier U1 output end
(512) 2 Sallen-Key low pass filter cascaded structures are used, it includes：Resistance R6-R9, electric capacity C3-C6, operation amplifier
Device U2, U3；Wherein, operational amplifier U2, resistance R6, resistance R7, electric capacity C3 and electric capacity C4 form the first Sallen-Key low passes
Wave filter, operational amplifier U3, resistance R8, resistance R9, electric capacity C5 and electric capacity C6 form the 2nd Sallen-Key low pass filters,
After signal extracting circuit (511) output voltage LPF, export to threshold value comparison circuit (513)；Threshold value comparison circuit
(513) differential operational amplifier structure is used, it includes：Resistance R10-R11, electric capacity C7 and differential operational amplifier U4；Wherein：
In the same direction inputs of the DC reference voltage VDD1 through resistance R10 input difference operational amplifiers U4, DC offset voltage VDD2 warps
Resistance R11 input difference operational amplifiers U4 reverse input end, threshold voltage VTDetermined by VDD1 and VDD2 value, low pass filtered
The output voltage of wave circuit (512) input difference operational amplifier U4 after electric capacity C7 reverse input end, is designated as VT1, R12 is
Feedback resistance, it is connected to from differential operational amplifier U4 output end to input, as voltage VT1>VTWhen, calculus of differences is put
Big device U4 output high level, as voltage VT1<VTWhen, differential operational amplifier U4 output low levels；Resistance shock absorbing circuit (514) by
Power device Q1, weakening resistance R0 and resistance R13 compositions, wherein：Power device Q1 grid is with differential operational amplifier U4's
Output end connection, drain electrode is connected by weakening resistance R0 with the output end of three phase rectifier filter circuit (21), source electrode passes through resistance
R13 is connected with earth terminal, and when threshold circuit (513) exports high level, the power device Q1 of resistance shock absorbing circuit (514) is led
It is logical, the thick DC voltage V of three phase rectifier filter circuit (21) outputinFlowed into through shock absorbing circuit R0, power device Q1 and resistance R13
Earth terminal, when threshold circuit (513) exports low level, the power device Q1 shut-offs of resistance shock absorbing circuit (514), shock absorbing circuit
R0 does not work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610019738.1A CN105450003B (en) | 2016-01-13 | 2016-01-13 | A kind of voltage-stabilized power supply shock absorbing circuit |
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| CN201610019738.1A CN105450003B (en) | 2016-01-13 | 2016-01-13 | A kind of voltage-stabilized power supply shock absorbing circuit |
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| CN105450003B true CN105450003B (en) | 2017-12-05 |
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| CN109256993A (en) * | 2018-11-20 | 2019-01-22 | 东莞市德克韦尔能源技术有限公司 | A kind of underground digital power system |
| CN111181548B (en) * | 2020-01-16 | 2022-11-22 | 山东美创生物科技股份有限公司 | Counting and sampling circuit for mosquito killing equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204721211U (en) * | 2015-06-26 | 2015-10-21 | 广东美的制冷设备有限公司 | The power supply circuits of inverter and there are its household electrical appliance |
| CN105162331A (en) * | 2015-08-24 | 2015-12-16 | 中国石油集团渤海钻探工程有限公司 | Paralleled current sharing technology-based switching power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06209574A (en) * | 1993-01-06 | 1994-07-26 | Sony Corp | Power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204721211U (en) * | 2015-06-26 | 2015-10-21 | 广东美的制冷设备有限公司 | The power supply circuits of inverter and there are its household electrical appliance |
| CN105162331A (en) * | 2015-08-24 | 2015-12-16 | 中国石油集团渤海钻探工程有限公司 | Paralleled current sharing technology-based switching power supply circuit |
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Effective date of registration: 20210902 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. |