CN104242615A - High-temperature isolated power device - Google Patents
High-temperature isolated power device Download PDFInfo
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- CN104242615A CN104242615A CN201410498505.5A CN201410498505A CN104242615A CN 104242615 A CN104242615 A CN 104242615A CN 201410498505 A CN201410498505 A CN 201410498505A CN 104242615 A CN104242615 A CN 104242615A
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Abstract
The invention discloses a high-temperature isolated power device which comprises a starting circuit module, a PWM (pulse width modulation) control module, a driving module, a flyback output module, an error amplification module and an optocoupler isolation module. The starting circuit module provides starting voltages for the PWM control module, the PWM control module outputs controllable duty ratios to the driving module, the duty ratios are adjusted by the driving module, switch tubes of the flyback output module can be driven, the flyback output module outputs stable direct-current voltages for underground motors, and the direct-current output voltages are processed by the error amplification module and an optocoupler feedback module and then are transmitted to the PWM control module, so that a closed circuit can be formed, and stable running of the integral power device can be guaranteed. The high-temperature isolated power device has the advantages that a medium-power, high-dynamic and wide-input isolated power source is designed on the basis of a high-temperature PWM control chip, isolation effects can be realized by the aid of an optocoupler isolation chip, the traditional transformer isolation form is broken through, and a driving circuit can be simplified.
Description
Technical field
The present invention relates to a kind of high temp. isolation electric power device, belong to the underground power supply used technical field of rotary steering system.
Background technology
Because drilling well mostly is outdoor, rotary steering system usually needs to be operated in the deep-well of a few km in down-hole, and control system is powered and utilized down-hole turbogenerator to system power supply more, with energy savings with realize closed-loop control.The electricity sent due to turbogenerator is alternating current, directly can not be supplied in control circuit, therefore needs to change, and the Switching Power Supply that adopts to provide the stable power-supplying needed for control system more.
The core of high temp. isolation electric power is the stable of voltage under wide input.There are many company professional production DC/DC modules abroad, technology relative maturity.GAIA company newly releases HTPS-15 series of high temperature DC/DC power module, input voltage DC150V-300V, and this module aims at logger and equipment to provide the converter that can work in high temperature environments for a long time continuously.There is high temperature resistant, the advantage such as high accuracy, high stability and high reliability; PGDS50 series meets the transient state/peak restrained module of MIL-STD-704 standard, and this module can accept minimum input voltage to 6V, can bear input voltage to 60V ~ 80V.
Domestic high temperature resistant DC/DC modular power is relatively all very little, high-power high temperature resistant DC/DC Power Management Design relative difficult as can be seen here, external drilling technology development is more advanced, but externally implements blockade on new techniques due to it, China's drilling well is comparatively slow with power technology development, and breaking up monopoly is the task of top priority.
Summary of the invention
The object of the invention is to solve the problem, proposing a kind of high temp. isolation electric power device, carry out voltage stabilizing design to the voltage that threephase generator rectifying and wave-filtering exports, the AC/DC conversion realizing 36v, 100w exports, and will ensure isolation.
A kind of high temp. isolation electric power device, comprises start-up circuit module, PWM control module, driver module, flyback output module, error amplification module and light-coupled isolation module;
Start-up circuit module provides starting resistor for PWM control module, PWM control module exports controllable duty ratio to driver module, driver module adjustment duty ratio, drive the switching tube of flyback output module, the output of flyback output module is the stable DC voltage of powering for downhole electrical motor, and VD, after error amplification module and opto-coupled feedback resume module, is sent to PWM control module, form a closed-loop path, ensure whole supply unit stable operation.
The invention has the advantages that:
(1) the present invention adopts and designs the high dynamic wide input insulating power supply of mid power based on high temperature pwm chip, realizes isolation, breach traditional transformer isolation method, simplify drive circuit by light-coupled isolation chip;
(2) structure is simple, and volume is little;
(3) cost is low, and efficiency is high;
(4) output voltage stabilization, high accuracy;
Accompanying drawing explanation
Fig. 1 is rotary steering downhole system power module block diagram;
Fig. 2 is the start-up circuit schematic diagram of 36v power supply;
Fig. 3 is drive circuit schematic diagram;
Fig. 4 is that flyback exports topological schematic diagram;
Fig. 5 is that error is amplified and optical coupling isolation circuit schematic diagram;
In figure:
1, start-up circuit module 2, PWM control module 3, driver module
4, flyback output module 5, error amplification module 6, light-coupled isolation module
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Power supply supply in rotary steering downhole system, from turbine threephase generator, is fluctuated through the filtered voltage of three phase full wave rectification, is converted 36v direct voltage after apparatus of the present invention AC/DC switch power module between 50v-150v.After this, this voltage part is converted to ± 5v, ± 12v, ± 15v plurality of voltages, for electric machine control system is powered through power management module; Another part Direct driver IPM module, by means of electric machine control system control IPM to realize controlling motor speed and location.The voltage output pulsation of AC/DC module directly affects control precision and stability.
Concrete, the present invention is a kind of high temp. isolation electric power device, as shown in Figure 1, comprises start-up circuit module 1, PWM control module 2, driver module 3, flyback output module 4, error amplification module 5 and light-coupled isolation module 6.
Start-up circuit module 1 provides starting resistor for PWM control module 2, PWM control module 2 exports controllable duty ratio to driver module 3, driver module 3 adjusts duty ratio, drive the switching tube of flyback output module 4, the output of flyback output module 4 is the stable DC voltage of powering for downhole electrical motor, and VD, after error amplification module 5 and opto-coupled feedback module 6 process, is sent to PWM control module 2, form a closed-loop path, ensure whole supply unit stable operation.
Start-up circuit module 1 structure as shown in Figure 2, start-up circuit module 1 is for PWM control module 2 is powered and design, mainly comprise voltage stabilizing didoe, technotron, two resistance, electric capacity and forward diode, electric capacity withstand voltage is 50v, input voltage connects two resistance, the other end of two resistance connects grid and the drain electrode of technotron respectively, simultaneously, the grid of technotron connects a voltage stabilizing didoe, the forward end ground connection of voltage stabilizing didoe, the source electrode of technotron connects the positive pole of a forward diode, the negative pole of diode connects an electric capacity, what pwm control circuit 2 core adopted is high temperature PWM controller, for ensureing that pwm control circuit 2 starts, design start-up circuit module 1.After supply unit can stablize output, will be provided the power supply of driving and pwm control circuit 2 by accessory power supply, start-up circuit module 1 enters cut-off state, reduces power consumption.
PWM control module 2 is cores of this device, the key of Switching Power Supply is the PWM (pulse width modulated waveform of driving switch pipe, PWM control module 2 comprises PWM controller and its periphery configure circuit, and its periphery configure circuit comprises RC circuit, negative feedback resistor network.
The feedback pin of PWM controller connects the output of light-coupled isolation module 6, and the output of PWM controller connects the input of driver module 3, output pwm signal.
Selected PWM controller is CHT-MAGMA, its built-in reference voltage source, and feedback voltage compares with sheet internal reference reference voltage, forms threshold judgement level, and pulse width control adopts triangular wave comparison method.Feedback voltage affects duty ratio, stablizes output by regulating duty ratio.
Switching tube used in flyback output module 4 is nomal closed type carborundum JFET.Need design driven drives switching tube.
Driver module 3 as shown in Figure 3, comprises booster circuit, two-stage amplifying circuit and push-pull circuit.
Namely the composition of two-stage amplifying circuit, push-pull circuit comprises four triodes and its configuration circuit
Booster circuit comprises two resistance, electric capacity and diodes, the pwm signal of input is connected to first resistance, first resistance other end connects the negative end of second resistor and diode respectively, the other end of second resistor is connected to two-stage amplifying circuit, the forward end of diode connects the negative end of voltage stabilizing didoe, the pressure drop of voltage stabilizing didoe is 2v, simultaneously, the negative end of voltage stabilizing didoe also connects a resistance and an electric capacity, electric capacity is in parallel with voltage stabilizing didoe, and the other end of resistance connects the voltage source of 8v.
The input of driver module 3 is PWM that PWM control module 2 exports, and through the two-stage amplifying circuit of driver module 3, then outputs to the input of flyback output module 4 to push-pull circuit.
Two-stage amplifying circuit comprises two triodes, and two triodes adopt cascode to connect, and push-pull circuit comprises two triodes, adopts the triode of NPN with PNP symmetry to be connected.Both increase drive current like this, also improve the misoperation of switching tube, ensure that switching tube is fully operational in saturation region or cut-off region, thus reduce alternating-current switch loss.
As shown in Figure 4, flyback output module 4 comprises flyback transformer, switching tube, output capacitance, diode to flyback output module 4;
Flyback transformer winding ratio is 1:1, what magnetic core adopted is the magnetic core 77190 of iron sial material, the grid of switching tube connects the output of driver module 3, the drain electrode of switching tube connects the initial coil of flyback transformer, source ground, the Same Name of Ends of the secondary coil of flyback transformer is connected to the positive pole of diode, and the negative end of diode is exit point, also connects output capacitance and output loading simultaneously.The different name termination output capacitance of the secondary coil of flyback transformer and another common port of output loading, the forward end of output capacitance connects the input of error amplification module 5.
The advantage of flyback topologies does not need secondary outputting inductance, also do not need reset winding, and volume and cost have a clear superiority in.During switching tube conducting, flyback transformer stored energy, load current is only provided by output filter capacitor, and when switching tube turns off, the energy that flyback transformer stores is sent to load and to capacitor charging.
Because the voltage fluctuation of down-hole turbogenerator is comparatively large, back-end circuit voltage endurance capability is limited, and secondly, ground wire also can have considerable influence to the stability of output voltage, need carry out electrical isolation to output.Buffer circuit generally has transformer isolation and light-coupled isolation, transformer isolation need be nursed one's health the signal of secondary output, consider the simplification of circuit, the present invention adopts light-coupled isolation module 6, light-coupled isolation module 6 as shown in Figure 5, comprises light-coupled isolation chip, resistance, voltage stabilizing didoe, operational amplifier.
The output voltage of flyback output module 4 is connected to the common port of two resistance, another termination voltage stabilizing didoe of one of them resistance, the negative end of voltage stabilizing didoe is connected to the negative end of operational amplifier simultaneously, the other end of another resistance is connected to a resistance, this resistance is connected jointly with the forward end of voltage stabilizing didoe puts ground wire, and the forward end of operational amplifier is connected to the other end of earth resistance.Meanwhile, the output of operational amplifier is connected to the negative end of operational amplifier.The output of operational amplifier is connected to the forward end of light-coupled isolation chip input, the negative end ground connection of light-coupled isolation chip input.The output of light-coupled isolation chip is connected to PWM control module 2.
Wherein, the input termination of light-coupled isolation chip be the output of error amplification module 5, the output termination of light-coupled isolation chip be the input of PWM control module 2.
For the Linear Temperature drift characteristic of light-coupled isolation device, devise front end error amplification module 5, error amplification module 5 comprises voltage stabilizing didoe, precision resister and discharge circuit, and discharge circuit adopts negative feedback mode to connect.The output of flyback output module 4, through electric resistance partial pressure, is carried out differential amplification with the voltage of voltage stabilizing didoe and is delivered to discharge circuit, and the output of amplifier is connected to the light-coupled isolation chip of light-coupled isolation module 6.The sampled signal of output voltage is amplified through amplifier differential, is exaggerated the change of output voltage, thus reduces temperature drift impact.
High temp. isolation electric power device of the present invention has general application in rotary guiding device, and what in rotary guiding device, the power supply of the module such as motor drive module, data acquisition module, data processing module adopted is supply unit of the present invention.Isolation specific practice be the power supply of turbogenerator, drive circuit, PWM control module altogether, output module is floating ground, is isolated, ensure stable output and safety by forceful electric power light current.
The conductor size of flyback transformer is selected according to the kelvin effect of the maximum secting area of single cord, have mercy on reduce leakage inductance by multiply, guarantee that armature winding has higher energy to transmit ratio to secondary winding, meanwhile, also can reduce the spike interference of switching tube drain voltage.
The course of work:
The voltage that turbo-dynamo provides is as the input of flyback topologies, the PWM control switch pipe conducting of drive circuit turns off, the energy transferring that transformer is stored is in load and output capacitance, output voltage is got ratio and is delivered to PWM control module 2 through error amplification module 5, light-coupled isolation module 6, regulate the output of PWM control module 2, the output of PWM control module 2 connects driver module 3, and drive circuit connects switching tube.As can be seen here, from turbogenerator as input, export, then feed back to PWM control module 2 to voltage stabilizing, through driver module 3, flyback output module 4, constitutes a complete closed system.As shown in Figure 1.By utilizing, the voltage of down-hole turbogenerator is self-sufficient provides stable voltage to parts such as downhole electrical motor control system, data acquisition processing system and communication systems, power management module changes into corresponding voltage again according to the different demands of each module, achieve rotary steering system down-hole high temperature complex environment stable power-supplying, ensure that system reliably works.
Claims (6)
1. a high temp. isolation electric power device, comprises start-up circuit module, PWM control module, driver module, flyback output module, error amplification module and light-coupled isolation module;
Start-up circuit module provides starting resistor for PWM control module, PWM control module exports controllable duty ratio to driver module, driver module adjustment duty ratio, drive the switching tube of flyback output module, the output of flyback output module is the stable DC voltage of powering for downhole electrical motor, and VD, after error amplification module and opto-coupled feedback resume module, is sent to PWM control module, form a closed-loop path, ensure whole supply unit stable operation.
2. a kind of high temp. isolation electric power device according to claim 1, described start-up circuit module comprises voltage stabilizing didoe, technotron, two resistance, electric capacity and forward diode;
Input voltage connects two resistance, the other end of two resistance connects grid and the drain electrode of technotron respectively, the grid of technotron connects voltage stabilizing didoe, the forward end ground connection of voltage stabilizing didoe, the source electrode of technotron connects the positive pole of forward diode, and the negative pole of diode connects electric capacity, when after the stable output of supply unit, thered is provided the power supply of driving and pwm control circuit by accessory power supply, start-up circuit module enters cut-off state.
3. a kind of high temp. isolation electric power device according to claim 1, described PWM control module comprises PWM controller and its periphery configure circuit, and its periphery configure circuit comprises RC circuit, negative feedback resistor network; The feedback pin of PWM controller connects the output of light-coupled isolation module, and the output of PWM controller connects the input of driver module, output pwm signal.
4. a kind of high temp. isolation electric power device according to claim 1, described driver module comprises booster circuit, two-stage amplifying circuit and push-pull circuit;
Booster circuit comprises two resistance, electric capacity and diodes, the pwm signal of input is connected to first resistance, first resistance other end connects the negative end of second resistor and diode respectively, the other end of second resistor is connected to two-stage amplifying circuit, the forward end of diode connects the negative end of voltage stabilizing didoe, the negative end of voltage stabilizing didoe also connects a resistance and an electric capacity, and electric capacity is in parallel with voltage stabilizing didoe, and the other end of resistance connects voltage source; Two-stage amplifying circuit comprises two triodes, and two triodes adopt cascode to connect, and push-pull circuit comprises two triodes, adopts the triode of NPN with PNP symmetry to be connected; Two-stage amplifying circuit, push-pull circuit are also respectively equipped with configuration circuit; The input of driver module is the PWM that PWM control module exports, and through the two-stage amplifying circuit of driver module, then outputs to the input of flyback output module to push-pull circuit.
5. a kind of high temp. isolation electric power device according to claim 1, described flyback output module comprises flyback transformer, switching tube, output capacitance, diode;
Flyback transformer winding ratio is 1:1, what magnetic core adopted is iron sial material, the grid of switching tube connects the output of driver module, the drain electrode of switching tube connects the initial coil of flyback transformer, source ground, the Same Name of Ends of the secondary coil of flyback transformer is connected to the positive pole of diode, and the negative end of diode is exit point, also connects output capacitance and output loading simultaneously; The different name termination output capacitance of the secondary coil of flyback transformer and another common port of output loading, the forward end of output capacitance connects the input of error amplification module.
6. a kind of high temp. isolation electric power device according to claim 1, described light-coupled isolation module comprises light-coupled isolation chip, resistance, voltage stabilizing didoe, operational amplifier;
The output voltage of flyback output module is connected to the common port of two resistance, another termination voltage stabilizing didoe of one of them resistance, the negative end of voltage stabilizing didoe is connected to the negative end of operational amplifier simultaneously, the other end of another resistance is connected to a resistance, this resistance is connected jointly with the forward end of voltage stabilizing didoe puts ground wire, and the forward end of operational amplifier is connected to the other end of earth resistance; Meanwhile, the output of operational amplifier is connected to the negative end of operational amplifier; The output of operational amplifier is connected to the forward end of light-coupled isolation chip input, the negative end ground connection of light-coupled isolation chip input; The output of light-coupled isolation chip is connected to PWM control module;
The input termination of light-coupled isolation chip be the output of error amplification module, the output termination of light-coupled isolation chip be the input of PWM control module.
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| CN201410498505.5A CN104242615A (en) | 2014-09-25 | 2014-09-25 | High-temperature isolated power device |
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| CN201410498505.5A CN104242615A (en) | 2014-09-25 | 2014-09-25 | High-temperature isolated power device |
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Cited By (4)
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| CN104682388A (en) * | 2015-03-20 | 2015-06-03 | 宋刚 | Off-state power supply circuit for two-wire system electronic switch and intelligent switch |
| CN107357248A (en) * | 2017-07-20 | 2017-11-17 | 上海浅雪汽车电子有限公司 | Inertial navigation unit and system |
| CN109004824A (en) * | 2018-07-23 | 2018-12-14 | 中车青岛四方机车车辆股份有限公司 | Signal output control circuit |
| CN114301295A (en) * | 2020-10-07 | 2022-04-08 | 浙江杭可仪器有限公司 | Direct-current integrated power supply and design method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682388A (en) * | 2015-03-20 | 2015-06-03 | 宋刚 | Off-state power supply circuit for two-wire system electronic switch and intelligent switch |
| CN104682388B (en) * | 2015-03-20 | 2018-06-19 | 宋刚 | A kind of two-wire electronic switch off-state power supply circuit and intelligent switch |
| CN107357248A (en) * | 2017-07-20 | 2017-11-17 | 上海浅雪汽车电子有限公司 | Inertial navigation unit and system |
| CN107357248B (en) * | 2017-07-20 | 2023-07-04 | 上海浅雪汽车电子有限公司 | Inertial navigation device and system |
| CN109004824A (en) * | 2018-07-23 | 2018-12-14 | 中车青岛四方机车车辆股份有限公司 | Signal output control circuit |
| CN109004824B (en) * | 2018-07-23 | 2020-02-14 | 中车青岛四方机车车辆股份有限公司 | Signal output control circuit |
| CN114301295A (en) * | 2020-10-07 | 2022-04-08 | 浙江杭可仪器有限公司 | Direct-current integrated power supply and design method thereof |
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