CN108462396B - Controllable high-voltage direct-current power supply of 35kV oscillatory wave system - Google Patents
Controllable high-voltage direct-current power supply of 35kV oscillatory wave system Download PDFInfo
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- CN108462396B CN108462396B CN201810269675.4A CN201810269675A CN108462396B CN 108462396 B CN108462396 B CN 108462396B CN 201810269675 A CN201810269675 A CN 201810269675A CN 108462396 B CN108462396 B CN 108462396B
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- 230000003534 oscillatory effect Effects 0.000 title claims abstract description 25
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of high-voltage direct-current power supplies, in particular to a controllable high-voltage direct-current power supply of a 35kV oscillatory wave system, which comprises the following components: the device comprises a high-power switch power supply module, a half-bridge inverter circuit, a high-frequency transformer, a positive and negative bidirectional voltage doubling rectifying circuit, a voltage and current sampling circuit, a PWM control module, an isolation driving circuit, an adjusting input module, a signal acquisition circuit, an A/D conversion circuit, a wireless receiving module and an intelligent control chip. The controllable high-voltage direct-current power supply can be used in a 35kV cable oscillatory wave test system, has a good detection result, meets the requirement of oscillatory wave detection, and has the advantages of good controllability, safety, convenience, small volume, strong operability, large power output and the like.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current power supplies, in particular to a controllable high-voltage direct-current power supply of a 35kV oscillatory wave system.
Background
An oscillatory wave test system (Oscillating Waveform Test System, OWTS for short) is an emerging cable insulation fault detection technology, which excites partial discharge signals at cable insulation defects by applying a damped oscillatory wave voltage similar to power frequency to a tested cable, and effectively detects the partial discharge signals to judge whether the cable is insulated or not.
The cable oscillatory wave partial discharge detection system is a power supply for the on-site partial discharge test of the crosslinked polyethylene power cable, which is studied more at home and abroad in recent years. The oscillatory wave power supply and the alternating current power supply are good in equivalence, short in acting time, convenient to operate and easy to carry, various defects in the XLPE power cable can be effectively detected, and the cable cannot be damaged in the test. The basic idea is to utilize the series resonance principle of the equivalent capacitance of the cable and the inductance coil, so that the cable defect position can excite the local discharge signal in the process of repeated polarity conversion of the oscillating voltage, and the signal is measured through the high-frequency coupler, thereby achieving the detection purpose. The whole test loop is divided into two parts: the first is a direct current power supply loop; and secondly, the charging and discharging process of the cable and the inductor, namely the oscillation process. The switching between the two loops is achieved by a fast turn-off switch. The high-voltage direct-current power supply is an energy source and an important component of the oscillatory wave detection system.
The early stage of direct current high voltage power supply is to boost alternating current commercial power or three-phase power into alternating current high voltage power by a power frequency high voltage transformer, and then rectifying and filtering to obtain direct current high voltage power.
In addition, the traditional high-voltage direct-current power supply utilizes an autotransformer or a potentiometer to regulate voltage, and although the method is simple and easy to realize, the voltage regulation precision is inaccurate and easy to damage, so that the service life is not long, the output ripple is large, the output capability is weak, the regulation and control are unchanged, the input and control modes are single, and the like, and the method is large in size and not beneficial to the integration and realization of an oscillatory wave system.
With the development and popularization of the technical-grade computer technology of the switching power supply, the direct-current high-voltage power supply developed by adopting the high-frequency switching conversion technology and the single-chip microcomputer control technology and combining the characteristics of the high-voltage power supply becomes the main stream.
Disclosure of Invention
The invention provides a controllable high-voltage direct current power supply of a 35kV oscillatory wave system, which has high adjustment precision and stable output.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a controllable high voltage dc power supply for a 35kV oscillatory wave system, comprising:
the high-power switch power supply module is externally connected with 220 alternating current and is used for converting the alternating current into direct current;
the half-bridge inverter circuit is electrically connected with the high-power switch power supply module and is used for converting input direct current into alternating current;
the high-frequency transformer is electrically connected with the half-bridge inverter circuit and is used for boosting the input alternating current;
the positive and negative bidirectional voltage doubling rectifying circuit is electrically connected with the high-frequency transformer and is used for rectifying the input alternating current into direct current after boosting again and outputting the direct current;
the voltage and current sampling circuit is used for collecting current and voltage signals output by the positive and negative bidirectional voltage doubling rectifying circuit;
the PWM control module is electrically connected with the current-voltage sampling circuit and the intelligent control chip and is used for sending a duty ratio adjusting signal of the switching power supply to the half-bridge inverter circuit according to the input current-voltage signal and/or the control command;
the isolation driving circuit is electrically connected with the PWM control module and used for converting the received adjusting signal into a signal which can be identified by the half-bridge inverter circuit and adjusting the half-bridge inverter circuit;
the adjusting input module is used for inputting control signals;
the signal acquisition circuit is electrically connected with the adjustment input module and is used for converting the control signal input by the adjustment input module into an analog electric signal;
the A/D conversion circuit is electrically connected with the signal acquisition circuit and is used for converting the analog electric signals acquired by the signal acquisition circuit into digital signals;
the wireless receiving module is used for receiving the remote control signal;
and the intelligent control chip is used for sending a control instruction to the PWM control module according to the received input signals of the A/D conversion circuit, the wireless receiving module and the voltage and current sampling circuit.
Further, the direct current power supply further comprises an LED lamp display module, and the LED lamp display module is electrically connected with the intelligent control chip.
Further, the direct current power supply further comprises a standby power supply, and the standby power supply is connected with the high-power switch power supply module in parallel and then is electrically connected with the half-bridge inverter circuit.
Further, the standby power supply adopts a lithium iron phosphate battery.
Further, the PWM control module adopts a chip of SG 3525.
Furthermore, the intelligent control chip adopts an AVR ATmega128 singlechip.
Furthermore, the high-frequency transformer adopts a primary isolation and secondary boosting mode and is designed into two transformers.
The controllable high-voltage direct-current power supply can be used in a 35kV cable oscillatory wave test system, has a good detection result, meets the requirement of oscillatory wave detection, and has the advantages of good controllability, safety, convenience, small volume, strong operability, large power output and the like.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is an internal structural diagram of the SG3525 chip;
fig. 3 is a schematic diagram of a structure of a positive and negative bidirectional voltage doubler rectifier circuit.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention relates to a controllable high-voltage direct-current power supply of a 35kV oscillatory wave system, a frame diagram of which is shown in figure 1, which comprises
The high-power switch power supply module is externally connected with 220 alternating current and is used for converting the alternating current into direct current;
the half-bridge inverter circuit is electrically connected with the high-power switch power supply module and is used for converting input direct current into alternating current;
the high-frequency transformer is electrically connected with the half-bridge inverter circuit and is used for boosting the input alternating current;
the positive and negative bidirectional voltage doubling rectifying circuit is electrically connected with the high-frequency transformer and is used for rectifying the input alternating current into direct current after boosting again and outputting the direct current;
the voltage and current sampling circuit is used for collecting current and voltage signals output by the positive and negative bidirectional voltage doubling rectifying circuit;
the PWM control module is electrically connected with the current-voltage sampling circuit and the intelligent control chip and is used for sending a duty ratio adjusting signal of the switching power supply to the half-bridge inverter circuit according to the input current-voltage signal and/or the control command;
the isolation driving circuit is electrically connected with the PWM control module and used for converting the received adjusting signal into a signal which can be identified by the half-bridge inverter circuit and adjusting the half-bridge inverter circuit;
the adjusting input module is used for inputting control signals;
the signal acquisition circuit is electrically connected with the adjustment input module and is used for converting the control signal input by the adjustment input module into an analog electric signal;
the A/D conversion circuit is electrically connected with the signal acquisition circuit and is used for converting the analog electric signals acquired by the signal acquisition circuit into digital signals;
and the wireless receiving module is used for receiving the remote control signal.
And the intelligent control chip is used for sending a control instruction to the PWM control module according to the received input signals of the A/D conversion circuit, the wireless receiving module and the voltage and current sampling circuit.
The direct-current power supply further comprises an LED lamp display module, and the LED lamp display module is electrically connected with the intelligent control chip.
The direct-current power supply further comprises a standby power supply, and the standby power supply is connected with the high-power switch power supply module in parallel and then is electrically connected with the half-bridge inverter circuit. And the standby power supply adopts a lithium iron phosphate battery.
Wherein, the intelligent control chip adopts an AVR ATmega128 singlechip.
The invention mainly comprises a low-voltage power supply side, a high-voltage direct-current power supply main body side, an intelligent control chip and a peripheral control side 4. Wherein the low voltage power supply side is served by a standby power supply or an AC220 and a high power switching power supply; the high-voltage direct-current power supply main body side comprises a half-bridge inverter circuit, a high-frequency transformer, a positive and negative bidirectional voltage doubling rectifying circuit, a voltage and current sampling circuit, a PWM control module and an isolation driving circuit; the intelligent control chip reads the sampling data and the control information and outputs an instruction to control the voltage to rise or fall or protect; the peripheral control side obtains data through the A/D conversion circuit and the wireless receiving module.
Wherein, half-bridge inverter circuit:
the isolated circuit is characterized in that the input side and the output side are isolated by a transformer, so that multiplexing output can be realized, and normal excitation type, flyback type, push-pull type, half-bridge and full-bridge are commonly used. The forward circuit is simpler, the cost is low, the reliability is high, but the transformer is excited in one direction, the utilization ratio is low, and the forward circuit is suitable for various medium and small power switching power supplies. The flyback circuit is very simple, low in cost, high in reliability, simple in driving circuit, difficult to achieve larger power and suitable for low-power occasions. The transformer in the full-bridge circuit is bidirectionally excited, so that higher power is easy to achieve, but the circuit is complex in structure, high in cost, low in reliability, and applicable to high-power industrial switching power supplies, welding power supplies, electrolytic power supplies and the like, and has the problems of direct connection and magnetic bias due to the fact that multiple groups of complex isolation driving circuits are needed; the half-bridge type power transformer is in a bidirectional excitation state, has no magnetic bias problem, has fewer switches and low cost, but has a straight-through problem, has low reliability, needs a complex isolation driving circuit, and is suitable for various industrial switching power supplies, computer switching power supplies and the like; the push-pull type power transformer is excited bidirectionally, the primary current loop of the transformer has only one switch, the on-state loss is small, the driving is simple, but the magnetic bias problem exists, which is a fatal defect, and the push-pull type power transformer is suitable for a low-input-voltage switching power supply.
The rated output voltage of the medium-high voltage direct current main power supply is 65kV, the rated output current is 4mA, the output power can reach 260W, and the medium-high voltage direct current main power supply belongs to a medium-low power supply, so that a half-bridge inverter circuit is selected as a main circuit topological structure.
Wherein, PWM control module:
the duty cycle of the switching power supply is adjusted so that the output voltage does not substantially vary with the load or with the input voltage. This method essentially regulates and controls the on pulse width of the transistor, so called pulse width modulation (Pulse Width Modulation, abbreviated PWM). The control method circuit is composed of a plurality of corresponding IC chips, and the pulse width modulation type SG3525 chip adopted in the invention has low price, low mass production cost, good stability and complete functions, and can be suitable for higher frequency control. The internal structure of the SG3525 chip is shown in fig. 2.
Wherein, keep apart drive circuit:
the driving circuit is an interface between the power electronic main circuit and the control circuit, is an important link of the power electronic device, and has great influence on the performance of the whole device. By adopting the driving circuit with good performance, the power electronic device can work in an ideal switching state, the switching time is shortened, the switching loss is reduced, and the driving circuit has important significance for the operation efficiency, the reliability and the safety of the device. The invention adopts a double-end full-isolation type driving circuit, the design idea is that one path of positive and negative pulse is input into a transformer, and the transformer outputs two paths of pulses with 180-degree phase difference to drive an upper power MOSFET and a lower power MOSFET of a half-bridge circuit, thereby avoiding the serious condition that the upper power MOSFET and the lower power MOSFET are simultaneously conducted. The transformer isolation has the characteristics of simple wiring, easy realization, low cost, rapidness and high performance.
Wherein, high frequency transformer:
the high frequency of the high-voltage power supply can miniaturize the power supply device, the dynamic response speed of the system is increased, the efficiency of the power supply device is improved, and the environmental noise pollution can be effectively restrained. However, the impediment to the development of high-frequency high-voltage power supply is mainly embodied in high-frequency high-voltage transformers, which are mainly problematic: firstly, the volume of the high-frequency transformer is reduced, but the insulation problem is prominent; and secondly, when the voltage output is high, the transformer becomes higher, and the large transformation ratio inevitably leads to serious nonlinearity of the transformer, so that leakage inductance and distributed capacitance of the transformer are greatly increased.
In order to solve the insulation problem, the design of the transformer in the high-voltage direct-current main power supply adopts a primary isolation and secondary boosting mode, and is designed into two transformers. The primary coil and the secondary coil of the first-stage transformer are wound by triple insulated wires in design, and the number of turns of the primary coil of the first-stage transformer is the same as that of the secondary coil of the second-stage transformer, so that the safety of a circuit is further ensured. The inverter is separated from the voltage doubling rectifying circuit, the isolation transformer and the step-up transformer are immersed into the transformer oil together with the voltage doubling circuit to improve the compressive strength, and the low-voltage part and the high-voltage part are separated, so that the installation and the use are safe and reliable.
In order to reduce leakage inductance of the windings, the following measures are taken: firstly, selecting a proper iron core structure and shape; secondly, the winding is designed to be thin and high, the height of the winding is increased, and the thickness of the winding is reduced; thirdly, the winding adopts stranded copper wires or wide thin copper foil, so that the copper occupation factor is increased; fourthly, a layered cross winding method is adopted to ensure that the winding is tightly combined.
Wherein, positive and negative two-way voltage doubling rectification:
the invention adopts a scheme of positive and negative bidirectional voltage doubling rectification, namely, a positive voltage doubling circuit and a negative voltage doubling circuit are connected in parallel behind a high-voltage transformer. As shown in figure 3, a positive and negative bidirectional voltage doubling rectifying mode is formed, one end of each of the positive and negative ends is grounded, and the other end of each of the positive and negative ends outputs high voltage, so that the whole circuit is equivalent to two ten-time voltage rectifying circuits connected in series. The purpose of doing so is mainly to reduce the internal voltage drop of the voltage doubling rectifying circuit, improve the stability and the efficiency of the direct current power supply, enhance the load capacity and greatly reduce the ripple coefficient of the power supply output.
Wherein, voltage and current sampling circuit
During the operation of the power supply, when the condition of the input and output changes, the power supply has a self-regulating function. This requires the control circuit of the power supply to have a function of stabilizing output. The control circuit can detect the output voltage of the circuit, then compare the detected value with the set reference value to obtain an error value, and utilize the error to calculate and process to control the main circuit, so that the output value is continuously close to the set value, thereby achieving the purpose of voltage stabilizing output.
For example, when the power supply voltage decreases or the load resistance decreases to cause the output voltage to decrease, the voltage fed back to the inverting output terminal 1 pin of the error amplifier in SG3525 decreases, the output voltage of the error amplifier increases, so that the voltage applied to the inverting input terminal of the pwm comparator increases, the on time of the output transistor increases, and therefore the on time of the power MOS transistor also increases, the duty ratio increases, and the output voltage returns to the original stable value. Experiments prove that the method has the advantages of simplicity, rapidness and reliability.
Similarly, the overcurrent protection is designed for protecting the load and the power supply itself, and the protection function is to compare the detected current value with the overcurrent setting point, and when the output current reaches the overcurrent setting point, the protection circuit acts to block the trigger pulse to stop the power supply from working, and the power supply must be restarted for restarting.
Wherein, wireless receiving module
In order to remotely and wirelessly control the output of the high-voltage direct-current source and the control related actions, the control signal transmitted from the upper computer side is received through a wireless receiving module in the design of the invention. The remote control can ensure the safety of personal equipment and improve the portability of the oscillatory wave system on site.
Wherein, standby power supply
The lithium iron phosphate battery is a standby power supply of the medium-high voltage direct current power supply, and the power supply has the following characteristics:
(1) The theoretical specific capacity of the high-energy density material is 170mAh/g, and the actual specific capacity of the product can exceed 140mAh/g;
(2) Safety is the safest lithium ion battery anode material at present, and does not contain any heavy metal elements harmful to human bodies;
(3) Long service life and can be charged and discharged for more than 2000 times.
(4) The lithium battery with the lithium iron phosphate positive electrode material has excellent charging performance, can be charged at a high rate, and can be fully charged within 1 hour at maximum.
The standby power supply is beneficial to realizing the offline test work of the cable oscillating wave under emergency conditions (when no alternating current power supply is provided).
The high-voltage direct-current power supply is used in a 35kV cable oscillatory wave test system, has a good detection result, meets the requirement of oscillatory wave detection, and has good controllability, safety, convenience, small volume, strong operability, large power output and the like.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (5)
- The controllable high-voltage direct-current power supply of the 1.35kV oscillatory wave system is characterized by comprising a high-power switch power supply module, wherein 220 alternating current is externally connected and used for converting the alternating current into direct current;the half-bridge inverter circuit is electrically connected with the high-power switch power supply module and is used for converting input direct current into alternating current;the high-frequency transformer is electrically connected with the half-bridge inverter circuit and is used for boosting the input alternating current;the positive and negative bidirectional voltage doubling rectifying circuit is electrically connected with the high-frequency transformer and is used for rectifying the input alternating current into direct current after boosting again and outputting the direct current;the voltage and current sampling circuit is used for collecting current and voltage signals output by the positive and negative bidirectional voltage doubling rectifying circuit; the PWM control module is electrically connected with the voltage and current sampling circuit and the intelligent control chip and is used for sending a duty ratio adjusting signal of the switching power supply to the half-bridge inverter circuit according to the input current and voltage signal and the control instruction; the isolation driving circuit is electrically connected with the PWM control module and used for converting the received adjusting signal into a signal which can be identified by the half-bridge inverter circuit and adjusting the half-bridge inverter circuit;the adjusting input module is used for inputting control signals;the signal acquisition circuit is electrically connected with the adjustment input module and is used for converting the control signal input by the adjustment input module into an analog electric signal;the A/D conversion circuit is electrically connected with the signal acquisition circuit and is used for converting the analog electric signals acquired by the signal acquisition circuit into digital signals;the wireless receiving module is used for receiving the remote control signal;the intelligent control chip is used for sending a control instruction to the PWM control module according to the received input signals of the A/D conversion circuit, the wireless receiving module and the voltage and current sampling circuit;the direct-current power supply further comprises an LED lamp display module, and the LED lamp display module is electrically connected with the intelligent control chip; the PWM control module adopts a chip of SG 3525.
- 2. The controllable high-voltage direct-current power supply of a 35kV oscillatory wave system according to claim 1, wherein: the direct-current power supply also comprises a standby power supply, and the standby power supply is connected with the high-power switch power supply module in parallel and then is electrically connected with the half-bridge inverter circuit.
- 3. The controllable high-voltage direct-current power supply of a 35kV oscillatory wave system according to claim 2, characterized in that: and the standby power supply adopts a lithium iron phosphate battery.
- 4. The controllable high-voltage direct-current power supply of a 35kV oscillatory wave system according to claim 1, wherein: the intelligent control chip adopts an AVR ATmega128 singlechip.
- 5. The controllable high-voltage direct-current power supply of a 35kV oscillatory wave system according to claim 1, wherein: the high-frequency transformer adopts a primary isolation and secondary boosting mode and is designed into two transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110707950A (en) * | 2019-11-11 | 2020-01-17 | 广东工业大学 | Dual-mode control high-voltage electrostatic spinning power supply and generation method |
| CN110932557B (en) * | 2019-11-29 | 2021-01-12 | 山东科技大学 | High-gain quasi-resonant DC-DC converter based on voltage doubling rectifying circuit |
| CN111175570B (en) * | 2020-03-13 | 2022-03-08 | 中国工程物理研究院激光聚变研究中心 | Pulse discharge current recording device with trigger enabling function and fault identification method |
| CN113030661B (en) * | 2021-03-08 | 2024-01-19 | 深圳供电局有限公司 | Cable buffer layer defect detection device and method |
| CN113726172B (en) * | 2021-07-20 | 2023-06-16 | 北京航天时代激光导航技术有限责任公司 | Aging high-voltage power supply |
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