CN201674395U - Power supply for neutron generator - Google Patents
Power supply for neutron generator Download PDFInfo
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- CN201674395U CN201674395U CN2010201838850U CN201020183885U CN201674395U CN 201674395 U CN201674395 U CN 201674395U CN 2010201838850 U CN2010201838850 U CN 2010201838850U CN 201020183885 U CN201020183885 U CN 201020183885U CN 201674395 U CN201674395 U CN 201674395U
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Abstract
The utility model relates to a power supply for a neutron generator in a neutron porosity measurement-while-drilling system. The utility model mainly solves the problem that the conventional direct-current power supply cannot meet the requirement of the neutron generator in the neutron porosity measurement-while-drilling system on power supply. The power supply is characterized in that: two boost modules are connected in parallel between voltage input ends and voltage output ends; the two boost modules respectively adopt current type pulse width modulation chips as controllers, power transistors as switch transistors, inducers as energy storage and release elements and output capacitors as energy output and storage elements; the pulse output ends of the controllers output control signals to the grids of the switch transistors, the inducers store or release energy as the switch transistors are switch on or off, and the energy stored in the inducers is released into the output capacitors. The direct-current power supply can be adapted to the downhole high-temperature environment, is characterized by quick response, high step-up ratio and small size, and can meet the requirement of the downhole neutron generator on the direct-current power supply.
Description
Technical field:
The utility model relates to a kind of DC power supply, specifically, relates to a kind of direct current boosting power of powering for neutron generator in the down-hole is measured with the brill neutron porosity.
Background technology:
Aspect the complicated oil reservoir of efficient exploitation, the geologic steering drilling technology has clear superiority.With boring the neutron porosity measuring system is key components in the drilling geology guiding technique, and formation porosity then is one of important geologic parameter of implementing comprehensive formation evaluation.In with brill neutron porosity measuring system, because the work under bad environment of down-hole requires downhole measurement tools must be able to satisfy the narrow and small objective requirement of high temperature high voltage resistant, anti-vibration and space structure.Neutron generator is a kind of compact accelerator neutron source of being made up of neutron tube, high voltage source and control circuit, it is with the critical component that bores the neutron porosity measuring system, and is high temperature resistant for needing to the requirement of its power supply, response speed is fast, step-up ratio is high and volume is little.But DC power supply of the prior art does not have a kind of above-listed several requirements of can satisfying simultaneously, therefore, just needs the direct current boosting power of design specialized that neutron generator is powered.
The utility model content:
The technical problem of mentioning in order to solve in the background technology, it is a kind of with the neutron generator power supply that bores in the neutron porosity measuring system that the utility model provides, this kind DC power supply is applicable to the down-hole hot environment, and has the advantages that response speed is fast, step-up ratio is high and volume is little.
The technical solution of the utility model is: this kind neutron generator power supply, have voltage input end and voltage output end, and between described voltage input end and voltage output end, be parallel with two essentially identical boost modules.Wherein, described two boost modules all with two identical current source PWM chips as controller, as switching tube, as energy storage and energy releasing member, export memory element as energy with two identical power tubes with 2 identical output capacitors with two identical inductance.By the pulse output end of aforementioned controller grid output control signal to switching tube, by the on-off of switching tube, make the inductance storage power or release energy, be released in the output capacitor by the stored energy of inductance; Two diodes are arranged between two boost modules, charge mutually to stop aforementioned two boost modules.
The utlity model has following beneficial effect: the entire circuit of this kind neutron generator power supply is composed in parallel by two boost modules, two boost modules are all controlled the peak current of inductance by error signal, make the inductance storage power and release energy the final control output voltage of how much coming by the transmission energy.When inductance is operated in discontinuous current pattern following time, when promptly the current peak of inductance is big, just can realize higher step-up ratio, make this kind DC power supply can have response speed and higher step-up ratio faster thus.In addition, under this pattern, select suitable inductance core material, for example iron sial toroidal core after special coiling, will have the characteristics high temperature resistant, that volume is little.Therefore, the appearance of this kind DC power supply can be effectively for providing the DC power supply of satisfying the demand with the neutron generator that bores in the neutron porosity measuring system.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing:
By shown in Figure 1, this kind is with the neutron generator power supply that bores in the neutron porosity measuring system, have voltage input end Vin and voltage output end Vout, unique distinction is: be parallel with two essentially identical boost modules of structure between described voltage input end and voltage output end.Wherein, described two boost modules respectively with two identical current source PWM chip U1 and chip U3 as controller, with two identical power tube Q1 and power tube Q2 as switching tube, as energy storage and energy releasing member, export memory element as energy with two identical inductance L 1 and inductance L 2 with two identical output capacitor C5 and capacitor C11.By the pulse output end of aforementioned controller grid output control signal to switching tube, by the on-off of switching tube, make the inductance storage power or release energy, the energy stored by inductance is released in the output capacitor.In addition, lay diode D2 and diode D4 between two boost modules, its purpose is to stop aforementioned two boost modules to charge mutually.
Below, in conjunction with the accompanying drawings, wherein element and function elaborated:
The entire circuit of this DC power supply is composed in parallel by two modules, and wherein the effect of diode D2 and diode D4 is to stop respectively two modules to charge mutually.Two boost modules all with two identical current source PWM chip U1 and chip U3 as controller, by the peak current of error signal control inductance L 1 and inductance L 2, control the pwm pulse width indirectly.The frequency break-make that switching tube Q1 and switching tube Q2 set with current source PWM chip U1 and chip U3 respectively makes inductance L 1 and inductance L 2 storage power and releases energy.When switching tube Q1 and switching tube Q2 conducting, inductance is then with V
In/ L1 and V
InThe charging of the speed of/L2, store energy in the coil of inductance L 1 and inductance L 2.When switching tube Q1 and switching tube Q2 by the time, inductance L 1 and inductance L 2 produce reverse induction voltage, by diode D1 and diode D3 the electric energy that stores respectively with (V
Out-V
In)/L1 and (V
Out-V
InThe speed of)/L2 is discharged among output capacitor C5 and the output capacitor C11, thus, has formed output voltage.Like this, how many output voltages is controlled by transmitting energy, and transmits how much can controlling by the peak value of inductive current of energy.In this case, input voltage vin not only is used for boosting inverter, gives chip power supply simultaneously again, and input voltage is directly given chip power supply by current-limiting resistance R1 and resistance R 8 backs.
In addition, for making the such scheme enforcement that is optimized, promptly in order to reduce the power consumption stream of current source PWM chip U1 and chip U3, to reduce its temperature rise, can between each pulse output ends of two modules and power tube grid, install a switching tube driver additional, thereby improved the reliability that this circuit is worked under hot environment, the switching tube driver that is installed additional is respectively chip U2 and chip U4 as shown in the figure.During enforcement, the current source PWM chip that can select for use is the UC1842 cake core, and the switching tube driver of selecting for use is the IR2101 cake core.In addition, for the pulse width modulated drive signal that makes the switching tube grid can guarantee about 15V, a 15V voltage stabilizing didoe Z1 and voltage stabilizing didoe Z2 can be inserted, respectively on the grid of switching tube Q1 and switching tube Q2 to realize protection to grid.
In this kind DC power supply, whole voltage stabilizing process has comprised two closed-loop controls.One is Voltage loop, and promptly output voltage feeds back to error amplifier after taking a sample, and is used for relatively producing error voltage in the back with the 2.5V reference voltage of amplifier inside, and error amplifier control is because the variation of the output voltage that load variations causes.Two is electric current loop, be that resistance R s1 and resistance R s2 are respectively the switching tube source electrode to the current sense resistor between common port, switching tube conduction period, flow through voltage that the electric current of inductance L 1 and inductance L 2 produces on resistance R s1 and resistance R s2 delivered to the PWM comparator in-phase input end of chip U1 and chip U3, compare the pulsewidth that modulating pulse is controlled in the back with error voltage, thereby kept stable output voltage, peak inductive current in the error signal working control.
In addition, because this kind DC power supply is to satisfy the special requirement of down-hole neutron generator, requirement can realize bigger step-up ratio, for example reaches 6.25.Therefore, just require inductance L 1 and inductance L 2 need be operated in the discontinuous current pattern, cause the current peak that born on inductance L 1 and the inductance L 2 bigger thus.Also just require in power work, inductance will be avoided phenomenon saturated and that temperature rise is too high.The selection of considering magnetic core and line footpath is very big to inductance performance and temperature rise influence, therefore can select the iron sial toroidal core that can work under 300 ℃ of high temperature, and it is stronger that it bears the peak current ability, and electromagnetic interference is low.The lead of coiling inductance then can be selected the AWG26 high temperature wire for use, so just can effectively reduce the temperature rise of inductance.
In addition, owing to be subjected to the narrow and small restriction of space structure, require the volume of whole power supply must be less than 280 * 29 * 22mm
3, therefore, the magnet ring on inductance L 1 and the inductance L 2 can replace with 3 beads respectively, and the equivalence of connecting again after the coiling well separately becomes inductance L 1 and inductance L 2.
Claims (3)
1. a neutron generator power supply has voltage input end and voltage output end, it is characterized in that: be parallel with two boost modules between described voltage input end and voltage output end; Wherein, described two boost modules are respectively with two identical current source PWM chip (U1, U3) as controller, with two identical power tube (Q1, Q2) as switching tube, (L1 is L2) as energy storage and energy releasing member with two identical inductance, (C5 is C11) as energy output memory element with two identical output capacitors; By the pulse output end of aforementioned controller grid output control signal to switching tube, by the on-off of switching tube, make the inductance storage power or release energy, be released in the output capacitor by the stored energy of inductance; Two diodes are arranged between two boost modules, and (D2 D4), charges mutually to stop aforementioned two boost modules.
2. according to the neutron generator power supply described in the claim 1, it is characterized in that: between the grid of the pulse output end of described controller and switching tube, install a switching tube driver additional.
3. according to the neutron generator power supply described in the claim 2, it is characterized in that: selected current source PWM chip is the UC1842 cake core, selected switching tube driver is the IR2101 cake core, and the magnetic core of selected inductance is can be at 300 ℃ of iron sial toroidal cores of working down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201838850U CN201674395U (en) | 2010-05-10 | 2010-05-10 | Power supply for neutron generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201838850U CN201674395U (en) | 2010-05-10 | 2010-05-10 | Power supply for neutron generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674395U true CN201674395U (en) | 2010-12-15 |
Family
ID=43331802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201838850U Expired - Fee Related CN201674395U (en) | 2010-05-10 | 2010-05-10 | Power supply for neutron generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201674395U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333222A (en) * | 2014-11-03 | 2015-02-04 | 中国科学院声学研究所 | Logging-while-drilling apparatus power source |
| CN104410261A (en) * | 2014-11-07 | 2015-03-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Aluminum nitride substrate based frequency limiting power module |
| CN110366305A (en) * | 2019-08-19 | 2019-10-22 | 西安冠能中子探测技术有限公司 | α associated particle neutron tube direct-current plate power circuit |
-
2010
- 2010-05-10 CN CN2010201838850U patent/CN201674395U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333222A (en) * | 2014-11-03 | 2015-02-04 | 中国科学院声学研究所 | Logging-while-drilling apparatus power source |
| CN104410261A (en) * | 2014-11-07 | 2015-03-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Aluminum nitride substrate based frequency limiting power module |
| CN110366305A (en) * | 2019-08-19 | 2019-10-22 | 西安冠能中子探测技术有限公司 | α associated particle neutron tube direct-current plate power circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20160510 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |