CN113179012A - DC voltage-stabilized source suitable for mining multistage AC voltage input - Google Patents
DC voltage-stabilized source suitable for mining multistage AC voltage input Download PDFInfo
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- CN113179012A CN113179012A CN202110281492.6A CN202110281492A CN113179012A CN 113179012 A CN113179012 A CN 113179012A CN 202110281492 A CN202110281492 A CN 202110281492A CN 113179012 A CN113179012 A CN 113179012A
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- 238000005065 mining Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 126
- 238000004146 energy storage Methods 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000003245 coal Substances 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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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
- H02M1/36—Means for starting or stopping converters
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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
- H02M3/33569—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
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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
- 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
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a direct current stabilized voltage power supply suitable for mining multistage alternating current voltage input, which comprises an uncontrolled rectifying circuit, a slow starting circuit and a direct current output circuit, wherein one end of the slow starting circuit is electrically connected with the uncontrolled rectifying circuit, and the direct current output circuit is electrically connected with the other end of the slow starting circuit; the direct current output circuit comprises a plurality of two-stage module converters, wherein the input ends of the two-stage module converters are sequentially connected in series, and the output ends of the two-stage module converters are connected in parallel. By utilizing the technical scheme of the invention, the DC power supply can be suitable for any level of voltage within the range of 75-1400V of AC voltage, effectively expands the input range of the DC power supply and meets the requirements of different levels of power supply voltage under a coal mine.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a direct-current stabilized power supply suitable for mining multistage alternating-current voltage input.
Background
The underground alternating-current voltage of the coal mine is high in grade, the input alternating-current voltage grade is mainly 127/220/380/660/1140V, the lower limit of the allowable voltage fluctuation range is 75% of the voltage, the upper limit of the allowable voltage fluctuation range is 110% of the voltage, and in different power distribution systems of one mine, multiple alternating-current voltage grades may exist at the same time, so that one power supply cannot meet the power distribution systems of multiple specifications. At present, most of underground coal mine power supplies adopt an integrated chip type pure flyback technology, input voltage only can cover voltage specifications of 127/220/380/660V or 380/660/1140V, all voltage levels cannot be covered in one power supply at the same time, the duty ratio conversion range of the flyback power supply is narrow, the upper level and the lower level of alternating current voltage cannot be considered, and particularly in the loading process of 127V alternating current voltage levels, due to the fact that a power supply line is long, high line loss exists, the voltage of the input end of the power supply is lower than 75% of the lower limit value of 127V, and the power supply cannot run.
Considering coal mine industry in-service use operating mode, single-phase alternating current power supply cable is long (more than 2 kilometers), when direct current regulated current carries out output and carries, form great voltage drop loss on long distance power supply cable, can make direct current regulated power supply input alternating voltage far below the required voltage of standard, but characteristics and the in-service use environment of fully combining the coal mine industry in the operating mode, can't carry out remote power supply through shortening power supply cable length or adopting thick cable, this input voltage operating range and the ability that just needs direct current regulated power supply further to reduce the power. However, as the demand that 1140VAC power supply grade is connected to a direct current stabilized power supply in an underground coal mine is more and more, a power supply which can meet the whole voltage grade range needs to be researched and developed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the technical problem that the existing mining power supply cannot meet the power distribution requirements of various specifications at the same time, the invention provides a DC stabilized power supply suitable for mining multistage AC voltage input, wherein an uncontrolled rectifying circuit, a slow start circuit and a two-stage module converter are combined together, and the input range of the DC power supply is effectively widened.
The technical scheme adopted by the invention for solving the technical problems is as follows: direct current voltage-stabilized source suitable for mining multistage alternating voltage input includes:
uncontrolled rectification circuit, and
one end of the slow starting circuit is electrically connected with the uncontrolled rectifying circuit;
the direct current output circuit is electrically connected with the other end of the slow starting circuit;
the direct current output circuit comprises a plurality of two-stage module converters, the input ends of the two-stage module converters are sequentially connected in series, and the output ends of the two-stage module converters are connected in parallel.
By adopting the technical scheme, the DC power supply can be suitable for any level of voltage within the range of 75-1400 VAC of AC voltage, effectively expands the input range of the DC power supply, and meets the power supply voltage requirements of different levels in the underground coal mine.
In an embodiment provided by the present invention, the slow start circuit includes a relay J1 and a resistor R1, the relay J1 is connected in parallel with the resistor R1, one end of the relay J1 is connected to the uncontrolled rectifying circuit, the other end of the relay J1 is connected to the dc output circuit, one end of the resistor R1 is connected to the uncontrolled rectifying circuit, and the other end of the resistor R1 is connected to the dc output circuit.
By adopting the technical scheme, the impact current of the uncontrolled rectifying circuit can be restrained, and the generation of voltage drop is reduced.
In an embodiment of the present invention, the two-stage module converter includes a first-stage converter and a second-stage converter, the first-stage converter is electrically connected to the second-stage converter, and the first-stage converter is electrically connected to the slow start circuit.
In an embodiment provided by the present invention, the primary converter includes a bus capacitor voltage-dividing circuit and a high-voltage chopper circuit, the secondary converter includes a high-frequency resonant isolation circuit, the bus capacitor voltage-dividing circuit is electrically connected to the high-voltage chopper circuit, the high-voltage chopper circuit is electrically connected to the high-frequency resonant isolation circuit, and the bus capacitor voltage-dividing circuit is electrically connected to the slow start circuit.
In an embodiment provided by the present invention, the bus capacitor voltage-dividing circuit includes three capacitors, and the three capacitors are sequentially connected in series.
In an embodiment provided by the present invention, the high-voltage chopper circuit includes a high-voltage power transistor Q1, a freewheeling diode D1, a high-frequency filter inductor L1, and an energy storage capacitor C11, a collector of the high-voltage power transistor Q1 is electrically connected to a positive terminal of the bus capacitor voltage divider circuit, an emitter of the high-voltage power transistor Q1 is electrically connected to a cathode of the freewheeling diode D1, an emitter of the high-voltage power transistor Q1 is electrically connected to one end of the high-frequency filter inductor L1, the other end of the high-frequency filter inductor L1 is electrically connected to a positive terminal of the energy storage capacitor C11, a negative terminal of the energy storage capacitor C11 is electrically connected to a negative terminal of the bus capacitor voltage divider circuit, and an anode of the freewheeling diode D1 is electrically connected to a negative terminal of the bus capacitor voltage divider circuit.
By adopting the technical scheme, the voltage of the bus capacitor voltage division circuit with a wider variation range can be converted into a more stable direct-current voltage, so that the stability of the input voltage of the high-frequency resonance isolation circuit is improved, and the voltage withstanding grade of a power device of the high-frequency resonance isolation circuit is reduced.
In an embodiment of the present invention, the high frequency resonant isolation circuit includes a power tube Q11, a power tube Q12, a resonant capacitor C12, a resonant transformer Tx1, a three-terminal schottky diode D11 and an output filter capacitor C13, one end of the power tube Q11 is electrically connected to the positive terminal of the energy storage capacitor C11, the other end of the power tube Q11 is electrically connected to one end of the power tube Q12, the other end of the power tube Q12 is electrically connected to the negative terminal of the energy storage capacitor C11, the middle terminal of the power tube Q11 connected to the power tube Q12 is connected to one end of the resonant capacitor C12, the other end of the resonant capacitor C12 is connected to one end of the primary coil of the resonant transformer Tx1, the other end of the primary coil of the resonant transformer 1 is electrically connected to the negative terminal of the energy storage capacitor C11, the secondary coil of the resonant transformer Tx1 includes a first coil and a second coil, one end of the first coil is electrically connected with an anode end of the three-terminal schottky diode D11, the other end of the first coil is connected with one end of the second coil, the other end of the second coil is electrically connected with the other anode end of the three-terminal schottky diode D11, a common cathode end of the three-terminal schottky diode D11 is electrically connected with a positive end of the output filter capacitor C13, and a negative end of the output filter capacitor C13 is electrically connected with a central line end of the first coil and the second coil.
By adopting the technical scheme, the high-frequency converter can be utilized to electrically isolate the input and the output.
In an embodiment of the present invention, the number of the two-stage module converters is three, and the three two-stage module converters have the same structure.
By adopting the technical scheme, the normal operation of the power supply can be ensured, and the cost and the resource waste can not be caused.
In an embodiment of the present invention, output filter capacitors of three two-stage module converters are connected in parallel to a same load.
By adopting the technical scheme, the circuit structure can form a complete electric loop.
The invention has the beneficial effects that: by combining the uncontrolled rectifying circuit, the slow starting circuit and the plurality of two-stage module converters, the input range of a power supply is effectively widened, and the voltage level requirements of 127V/220V/380V/660V/1140V under a mine can be met; the uncontrolled rectifying circuit can convert input alternating current into direct current, but instantaneous impact current can be generated, the voltage-resistant grade can be improved by the plurality of two-stage module converters, and if the uncontrolled rectifying circuit is directly connected with the plurality of two-stage module converters, the impact current can damage a circuit; according to the invention, the uncontrolled rectifying circuit, the slow starting circuit and the plurality of two-stage module converters are combined, so that the impact current of the uncontrolled rectifying circuit can be restrained, and stable direct current can be output.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc regulated power supply suitable for mining multi-stage ac voltage input according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a two-stage modular converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a two-stage modular converter according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a dc regulated power supply suitable for mining multi-stage ac voltage input according to an embodiment of the present invention.
Reference numerals:
an uncontrolled rectifier circuit 1; a slow start circuit 2; a DC output circuit 3; a two-stage type module converter 31; a primary converter 311; a two-stage converter 312; a bus capacitance voltage divider circuit 313; a high-voltage chopper circuit 314; a high-frequency resonance isolation circuit 315; a first coil 3151; a second coil 3152.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the dc regulated power supply suitable for mining multistage ac voltage input provided by the present invention includes an uncontrolled rectifying circuit 1, a slow start circuit 2 and a dc output circuit 3, wherein one end of the slow start circuit 2 is electrically connected to the uncontrolled rectifying circuit 1, and the other end of the slow start circuit 2 is electrically connected to the dc output circuit 3. In this embodiment, the uncontrolled rectifying circuit 1 is a rectifying circuit composed of a rectifying diode without a control function, when an input ac voltage is constant, a dc voltage obtained on a load cannot be adjusted, the uncontrolled rectifying circuit 1 can change an applied ac voltage into a dc voltage by using the unidirectional conductivity of the rectifying diode, and the other end of the dc output circuit 3 can be connected to an electrical appliance under a mine. In this embodiment, the slow start circuit 2 includes a relay J1 and a resistor R1, the relay J1 is connected in parallel with the resistor R1, one end of the relay J1 is connected to the uncontrolled rectifier circuit 1, the other end of the relay J1 is connected to the dc output circuit 3, one end of the resistor R1 is connected to the uncontrolled rectifier circuit 1, and the other end of the resistor R1 is connected to the dc output circuit 3. The slow starting circuit 2 can restrain the impact current of the uncontrolled rectifying circuit 1 and reduce the generation of voltage drop. In some embodiments, relay J1 may also be replaced with an SCR power tube. In the present embodiment, the dc output circuit 3 includes a plurality of two-stage module converters 31, and the input terminals of the two-stage module converters 31 are sequentially connected in series and the output terminals thereof are connected in parallel. The power supply provided by the invention can be suitable for any level of voltage within the range of 75-1400 VAC of alternating voltage, can provide stable and reliable direct voltage for underground direct current electric equipment, effectively expands the input range of the direct current power supply, and can meet the power supply voltage requirements of different levels of underground coal mines.
Referring to fig. 2 to 4, in the present embodiment, the two-stage module transformer 31 includes a first-stage transformer 311 and a second-stage transformer 312, the first-stage transformer 311 is electrically connected to the second-stage transformer 312, and the first-stage transformer 311 is electrically connected to the slow start circuit 2. The first-stage converter 311 includes a bus capacitor voltage-dividing circuit 313 and a high-voltage chopper circuit 314, and the second-stage converter 312 includes a high-frequency resonant isolation circuit 315, in which the bus capacitor voltage-dividing circuit 313 is electrically connected to the high-voltage chopper circuit 314, the high-voltage chopper circuit 314 is electrically connected to the high-frequency resonant isolation circuit 315, and the bus capacitor voltage-dividing circuit 313 is electrically connected to the slow start circuit 2. In the present embodiment, the bus capacitor voltage divider circuit 313 includes a capacitor C1, a capacitor C2, and a capacitor C3, and the capacitor C1, the capacitor C2, and the capacitor C3 are sequentially connected in series. The high-voltage chopper circuit 314 comprises a high-voltage power tube Q1, a freewheeling diode D1, a high-frequency filter inductor L1 and an energy storage capacitor C11, wherein a collector of the high-voltage power tube Q1 is electrically connected with a positive end of the bus capacitor voltage division circuit 313, an emitter of the high-voltage power tube Q1 is electrically connected with a cathode end of the freewheeling diode D1, an emitter of the high-voltage power tube Q1 is electrically connected with one end of the high-frequency filter inductor L1, the other end of the high-frequency filter inductor L1 is electrically connected with a positive end of the energy storage capacitor C11, a negative end of the energy storage capacitor C11 is electrically connected with a negative end of the bus capacitor voltage division circuit 313, and an anode of the freewheeling diode D1 is electrically connected with. The high-frequency filter inductor L1 can reduce the output ripple of the energy storage capacitor C11, and at the same time, it can play the role of freewheeling when the high-voltage power tube Q1 is turned off. The freewheeling diode D1 can enable current to freewheel in a loop when the power transistor Q1 is turned off, and the freewheeling diode D1 can be replaced by an insulated gate bipolar transistor or a field effect transistor, and a synchronous rectification mode is adopted to further reduce loop loss. The high-frequency resonant isolation circuit 315 includes a power tube Q11, a power tube Q12, a resonant capacitor C12, a resonant transformer Tx1, a three-terminal schottky diode D11 and an output filter capacitor C13, wherein one end of the power tube Q11 is electrically connected to the positive terminal of the energy storage capacitor C11, the other end of the power tube Q11 is electrically connected to one end of the power tube Q12, the other end of the power tube Q12 is electrically connected to the negative terminal of the energy storage capacitor C11, the center line terminal of the power tube Q11 connected to the power tube Q12 is connected to one end of the resonant capacitor C5969542, the power tube Q11, the power tube Q12 and the resonant capacitor C2 together form a half-bridge circuit, the other end of the resonant capacitor C12 is connected to one end of the primary coil of the resonant transformer Tx1, the other end of the primary coil of the resonant transformer Tx1 is electrically connected to the negative terminal of the energy storage capacitor C11, the secondary coil of the resonant transformer Tx1 is connected to the three-terminal schottky diode D11 and the output filter capacitor C13, specifically, the secondary coil of the resonant transformer Tx1 includes a first coil 3151 and a second coil 3152, one end of the first coil 3151 is electrically connected to one anode terminal of the three-terminal schottky diode D11, the other end of the first coil 3151 is connected to one end of the second coil 3152, the other end of the second coil 3152 is electrically connected to the other anode terminal of the three-terminal schottky diode D11, the common cathode terminal of the three-terminal schottky diode D11 is electrically connected to the positive terminal of the output filter capacitor C13, and the negative terminal of the output filter capacitor C13 is electrically connected to the center line terminal of the first coil 3151 and the second coil 3152. In the present embodiment, the number of the two-stage module converters 31 is three, each two-stage module converter 31 has the same structure, and the output filter capacitor C13, the output filter capacitor C23, and the output filter capacitor C33 of the three two-stage module converters 31 are connected in parallel to the same load, so as to form a complete electrical circuit. Of course, in other embodiments, a Buck-Boost circuit may be used in the first-stage converter 311, and a full-bridge LLC resonant converter or a high-frequency phase shift converter may be used in the second-stage converter 312, which is not limited herein and may be designed and selected according to requirements.
Referring to fig. 1 to 4, the input ac voltage level of the coal mine underground is mainly 127/220/380/660/1140V, so that the lower limit value of the input voltage is about 95V, and the upper limit value is about 1300V, the power input end provided by the invention rectifies ac into dc by means of uncontrolled rectification, and the instantaneous impulse current of uncontrolled rectification is suppressed by the slow start circuit 2, so as to reduce the line loss during the circuit operation, and the upper and lower limit values of the input voltage of a single power supply for the coal mine can be effectively expanded by combining the two-stage module converter 31, for example, the lower limit value is as low as 75VAC, and the upper limit value is increased to 1400 VAC. Because the invention adopts an uncontrolled rectification mode, in order to reduce the ripple current of the bus capacitor when the lower limit voltage is 75VAC is input, a proper capacitance value of the bus capacitor needs to be found, and the ripple current of the capacitor is an important factor causing loss and heating of the capacitor. At the moment of charging the bus capacitor by rectification, the bus capacitor is equivalent to a short circuit, the current generated at the moment is very large, the uncontrolled rectifying circuit 1 can be burnt in serious conditions, and the capacitance value of the capacitor of the circuit is applied to the upper limit voltage 1400VAC, so that larger impact current can be generated. In order to suppress the impact current, the uncontrolled rectifying circuit 1 is connected with the slow starting circuit 2 in series, and the resistance R1 in the slow starting circuit 2 increases the instantaneous resistance of uncontrolled rectifying, so that the impact current is reduced. When the voltage of the bus capacitor rises to a primary threshold value, the relay J1 in the slow starting circuit 2 can be conducted, and meanwhile, the resistor R1 is short-circuited, so that when the power supply works, the current at the uncontrolled rectifying rear end flows through the relay J1, and voltage drop is basically avoided. The direct current power supply produced by a flyback chip in the prior art can not generate timing and delay control by itself, uncontrolled rectification impact suppression is generally carried out in a mode of adopting an NTC thermistor, but the thermistor can not enable the resistance value of the resistor to be reduced to zero, the resistance value of about 12% at normal temperature can be remained generally at 100 ℃, particularly when the input voltage reaches the lower limit value, along with the increase of the output load of the power supply, the input current of the power supply can also be increased, the voltage drop on the thermistor can also be increased, the internal bus voltage of the power supply can be influenced, and the problem that the load can not be carried is caused. The slow starting circuit of the invention combines the mode of the relay with the current-limiting resistor, at the moment that the power supply is connected with the alternating current, the energy enters the bus capacitor through the current-limiting resistor R1, because the existence of the resistor R1 at the moment, the impact current is greatly restrained, when the bus capacitor reaches a certain threshold value, the digital control system can provide a high level to conduct the relay, the energy required by the bypass of the current-limiting resistor and the power supply flows through the relay, and the input voltage drop caused by adopting the thermistor is effectively reduced.
Referring to fig. 1 to 4, in the present embodiment, the bus capacitor includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, and a capacitor C9, nine capacitors are the same electrolytic capacitor, a withstand voltage of each capacitor is 450V, and nine capacitors are connected in series with the slow start circuit 2, so that the withstand voltage can reach 4050V, and a bus voltage of an output of an ac 1400VAC after uncontrolled rectification is about 1980V, and the nine capacitors are set to be sufficient to meet a bus voltage formed after 1400VAC uncontrolled rectification. Nine bus capacitors can divide the bus voltage, and every three capacitors form a bus capacitor voltage division circuit and bear one third of the total bus voltage after uncontrolled rectification. For example, the capacitors C1-C3 form a first bus capacitor voltage divider circuit, the capacitors C4-C6 form a second bus capacitor voltage divider circuit, the capacitors C7-C9 form a third bus capacitor voltage divider circuit, and the three bus capacitor voltage divider circuits divide the bus voltage equally. Certainly, the total number of the bus capacitors is not limited to this, and the design can be selected according to the voltage withstanding value required in practice, the voltage withstanding value of the bus capacitors needs to be 1.5-2 times of the voltage of each bus capacitor voltage division circuit, and the number of the bus capacitor voltage division circuits needs to be considered. For example, the highest input voltage designed by the invention is about 1400VAC, nine bus capacitors are selected, if the input voltage is increased again, the number of the bus capacitor voltage division circuits needs to be increased, the number of the bus capacitors also needs to be increased correspondingly, if the input voltage is reduced, the number of the bus capacitor voltage division circuits needs to be reduced, and the number of the bus capacitors also needs to be reduced correspondingly. According to the invention, 2 times of voltage is set as the withstand voltage value of the bus capacitor by combining the withstand voltage value of the capacitor and the practical underground coal mine use environment, so that the normal operation of a power supply can be ensured, and the cost and the resource waste can be avoided.
Referring to fig. 4, in the present embodiment, each two-stage module converter 31 includes a bus capacitor voltage-dividing circuit 313, a high-voltage chopper circuit 314, and a high-frequency resonant isolation circuit 315, and since the input voltage is suitable for 75VAC to 1400VAC, the voltage variation range of each bus capacitor voltage-dividing circuit 313 is relatively large, and the high-voltage chopper circuit 314 can convert the voltage of the bus capacitor voltage-dividing circuit 313 with a relatively wide variation range into a relatively stable dc voltage, so as to improve the stability of the input voltage of the high-frequency resonant isolation circuit 315 and reduce the voltage withstand level of the power device of the high-frequency resonant isolation circuit 315. In this embodiment, the high-frequency resonant isolation circuit 315 may utilize a high-frequency converter to electrically isolate input and output, and meanwhile, since the input voltage of 75VAC to 1400VAC causes a wide gain of the whole system, in order to increase the reliability and stability of the circuit system, the duty ratio of the high-voltage chopper circuit 314 is limited, so that the voltage on the output filter capacitor C13 in the high-frequency resonant isolation circuit 315 may be transformed to a certain extent along with the input voltage, and at this time, the high-frequency resonant isolation circuit 315 may be subjected to closed-loop regulation by a program of a digital control system to stabilize the output voltage. In the present embodiment, since the whole input voltage is equally divided by the three two-stage module converters 31 at the bus capacitor, and the total output power is also equally divided by the three two-stage module converters 31, the rear ends of the output filter capacitors of each two-stage module converter 31 are connected in parallel to form a complete electrical circuit.
In summary, the dc regulated power supply suitable for mining multistage ac voltage input provided by the present invention includes an uncontrolled rectifier circuit 1, a slow start circuit 2 and a dc output circuit 3, wherein an external ac voltage is converted into a dc voltage by the uncontrolled rectifier circuit 1, an instantaneous impact current of uncontrolled rectification is suppressed by the slow start circuit 2, a line loss is reduced, and the dc voltage can be stably output by the dc output circuit 3. The power supply provided by the invention can be suitable for any level of voltage within the range of 75-1400V of the underground AC voltage of the coal mine, can provide stable and reliable DC voltage for underground DC power equipment, effectively expands the input range of the DC power supply, can meet the requirements of different levels of power supply voltage under the coal mine, and simultaneously, the reasonable design of the power supply structure can save cost and avoid resource waste.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. Direct current voltage-stabilized source suitable for mining multistage alternating voltage input, its characterized in that includes:
uncontrolled rectification circuit (1), and
one end of the slow starting circuit (2) is electrically connected with the uncontrolled rectifying circuit (1);
the direct current output circuit (3), the said direct current output circuit (3) is connected electrically with another end of the said slow starting circuit (2);
the direct current output circuit (3) comprises a plurality of two-stage type module converters (31), the input ends of the two-stage type module converters (31) are sequentially connected in series, and the output ends of the two-stage type module converters (31) are connected in parallel.
2. The DC stabilized power supply applicable to the mining multistage AC voltage input is characterized in that the slow starting circuit (2) comprises a relay J1 and a resistor R1, the relay J1 is connected with the resistor R1 in parallel, one end of the relay J1 is connected with the uncontrolled rectifying circuit (1), the other end of the relay J1 is connected with the DC output circuit (3), one end of the resistor R1 is connected with the uncontrolled rectifying circuit (1), and the other end of the resistor R1 is connected with the DC output circuit (3).
3. The DC regulated power supply suitable for mining multistage AC voltage input according to claim 1, characterized in that the two-stage module converter (31) comprises a first-stage converter (311) and a second-stage converter (312), the first-stage converter (311) is electrically connected with the second-stage converter (312), and the first-stage converter (311) is electrically connected with the slow start circuit (2).
4. The DC stabilized power supply applicable to the mining multistage AC voltage input is characterized in that the primary converter (311) comprises a bus capacitor voltage division circuit (313) and a high-voltage chopper circuit (314), the secondary converter (312) comprises a high-frequency resonance isolation circuit (315), the bus capacitor voltage division circuit (313) is electrically connected with the high-voltage chopper circuit (314), the high-voltage chopper circuit (314) is electrically connected with the high-frequency resonance isolation circuit (315), and the bus capacitor voltage division circuit (313) is electrically connected with the slow start circuit (2).
5. The DC regulated power supply applicable to the mining multistage AC voltage input of claim 4, wherein the bus capacitor voltage division circuit (313) comprises three capacitors which are connected in series in sequence.
6. The DC stabilized power supply for mining use according to claim 4, the high-voltage chopper circuit (314) is characterized by comprising a high-voltage power tube Q1, a freewheeling diode D1, a high-frequency filter inductor L1 and an energy storage capacitor C11, the collector electrode of the high-voltage power tube Q1 is electrically connected with the positive end of the bus capacitor voltage division circuit (313), the emitter of the high-voltage power tube Q1 is electrically connected with the cathode terminal of the freewheeling diode D1, the emitter of the high-voltage power tube Q1 is electrically connected with one end of the high-frequency filter inductor L1, the other end of the high-frequency filter inductor L1 is electrically connected with the positive end of the energy storage capacitor C11, the negative end of the energy storage capacitor C11 is electrically connected with the negative end of the bus capacitor voltage division circuit (313), the anode of the freewheeling diode D1 is electrically connected with the negative end of the bus capacitor voltage division circuit (313).
7. The DC stabilized power supply suitable for mining multistage AC voltage input according to claim 4, wherein the high frequency resonance isolation circuit (315) comprises a power tube Q11, a power tube Q12, a resonant capacitor C12, a resonant transformer Tx1, a three-terminal Schottky diode D11 and an output filter capacitor C13, one end of the power tube Q11 is electrically connected with the positive terminal of the energy storage capacitor C11, the other end of the power tube Q11 is electrically connected with one end of the power tube Q12, the other end of the power tube Q12 is electrically connected with the negative terminal of the energy storage capacitor C11, the middle terminal of the power tube Q11 connected with the power tube Q12 is connected with one end of the resonant capacitor C12, the other end of the resonant capacitor C12 is connected with one end of the primary coil of the resonant transformer Tx1, and the other end of the primary coil of the resonant transformer Tx1 is electrically connected with the negative terminal of the energy storage capacitor C11, the secondary coil of the resonant transformer Tx1 includes a first coil (3151) and a second coil (3152), one end of the first coil (3151) is electrically connected to an anode terminal of the three-terminal schottky diode D11, the other end of the first coil (3151) is connected to one end of the second coil (3152), the other end of the second coil (3152) is electrically connected to the other anode terminal of the three-terminal schottky diode D11, the common cathode terminal of the three-terminal schottky diode D11 is electrically connected to the positive terminal of the output filter capacitor C13, and the negative terminal of the output filter capacitor C13 is electrically connected to the center line terminal of the first coil (3151) and the second coil (3152).
8. The DC stabilized power supply applicable to the mining multistage AC voltage input is characterized in that the number of the two-stage type module converters (31) is three, and the three two-stage type module converters (31) are identical in structure.
9. The DC regulated power supply applicable to the mining multistage AC voltage input of claim 8, wherein output filter capacitors of three two-stage module converters (31) are connected in parallel to the same load.
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Cited By (1)
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