CN109586557A - A kind of frequency converter pre-charge system and frequency converter - Google Patents
A kind of frequency converter pre-charge system and frequency converter Download PDFInfo
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- CN109586557A CN109586557A CN201811531209.5A CN201811531209A CN109586557A CN 109586557 A CN109586557 A CN 109586557A CN 201811531209 A CN201811531209 A CN 201811531209A CN 109586557 A CN109586557 A CN 109586557A
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Classifications
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
Abstract
Description
Technical field
The present embodiments relate to converter technology field, in particular to a kind of frequency converter pre-charge system and frequency converter.
Background technique
Setting pre-charge circuit is had on the bus of frequency converter, is primarily due to have bulky capacitor on frequency changer direct current bus In the presence of the voltage at the momentary capacitance both ends that power supply is connected will not be mutated, and the electric current at capacitor both ends can be mutated, capacitor both ends phase When in short circuit, if will lead to the damage of frequency converter internal circuit without pre-charge circuit, pre-charge circuit limits power supply herein and connects Lead to moment to the charging current of capacitor, rectifier in frequency converter is protected not damage because of the short circuit of capacitor.Modern times become Frequency device has the tendency that miniaturization, high power density, in order to reduce the size of complete machine, technical optimization is needed to upgrade.
However, it is found by the inventors that at least there are the following problems in the prior art: common in current low power frequency converter Pre-charge circuit is that one or more resistance are in parallel with relay or contactor, as shown in Figure 1, realizing to frequency converter bus capacitor Charging.Wherein, the input terminal of three-phase input power supply connection frequency converter, becomes direct current for three-phase alternating current by rectification circuit Pressure is charged by resistance R11 to bus electrolytic capacitor C11, C12, after busbar voltage reaches certain value, onboard Switching Power Supply (not shown in figure 1) is started to work, and the auxiliary contact of relay or contactor obtain electric, relay or contactor actuation, charging electricity Resistance R11 is short-circuited, and energy enters bus capacitor by relay K11, then passes through inverter circuit, drives motor operation.It is existing Middle power section (30kW~200kW) frequency converter Up Highway UHW capacitor pre-charge circuit still use the charging of small-power section (< 30kW) The scheme of resistance and relay (or contactor) parallel connection, since middle power inverter median generatrix electric current increases, to must select The contactor of high current causes pre-charge contactor type selecting difficult, since contactor volume is big, weight is big, also results in frequency converter The larger of complete machine, it is not compact enough.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of frequency converter pre-charge system, so that middle power inverter or big The volume of power inverter reduces, weight saving, reduces the probability for powering on damage for the first time, improves the safety of frequency converter.
In order to solve the above technical problems, embodiments of the present invention provide a kind of frequency converter pre-charge system, it is applied to Middle power inverter or big-power transducer, comprising: rectification unit, precharge unit, inversion unit and main control unit；
The of the connection of the power supply of rectification unit input terminal and three-phase alternating current, the first end of rectification unit and precharge unit The connection of one input terminal, the second end of rectification unit and the first output end of precharge unit connect, and the first of precharge unit is defeated Outlet and the first end of inversion unit connect, and the second input terminal of precharge unit and the second end of inversion unit connect；
Precharge unit includes thyristor, thyristor gating circuit, onboard Switching Power Supply and current-limiting resistance, IGBT group Circuit connection is between the grid and cathode of thyristor；
Wherein, the first end of onboard Switching Power Supply is as the first input end of precharge unit and the first end of rectification unit The second end of connection, onboard Switching Power Supply is connected as the first output end of precharge unit and the second end of rectification unit；Limit Leakage resistance is serially connected between the first end of onboard Switching Power Supply and the first end of inversion unit, and the first end of current-limiting resistance is as pre- First output end of charhing unit；
Thyristor anode and cathode is connected in parallel between the first end of current-limiting resistance and the second end of current-limiting resistance；Or Person, the cathode and anode series of thyristor are between the second end of onboard Switching Power Supply and the second end of inversion unit；
The power end of main control unit is connect with the first output end of onboard Switching Power Supply, the first control terminal of main control unit and crystalline substance The control terminal of brake tube trigger circuit connects；
Onboard Switching Power Supply obtains the output voltage of rectification unit, and out-put supply is passed through the first output by onboard Switching Power Supply End is transmitted to main control unit, and main control unit determines that frequency converter normal operation, main control unit issue first control signal to thyristor Trigger circuit controls thyristor by thyristor gating circuit and is in off state, and main control unit determines the both ends of inversion unit Voltage value is preset voltage value, and main control unit issues second control signal to thyristor gating circuit, passes through IGBT group electricity It is in the conductive state that road controls thyristor.
Embodiments of the present invention additionally provide a kind of frequency converter, including above-mentioned frequency converter pre-charge system.
In terms of existing technologies, thyristor is arranged in embodiment of the present invention in precharge unit, main control unit passes through Thyristor gating circuit controls the state of thyristor, realizes to the control of the charging current of inversion unit, avoids converter circuit The electric current that middle rectification unit completes rectification is directly transferred to inverter circuit causes converter circuit to be sent out since instantaneous current value is larger The phenomenon that raw damage, due to the small volume of thyristor, and it can adapt to the working environment of high current, so that the frequency converter is arranged The frequency converter volume of pre-charge system reduces, more compact in structure, is additionally provided with gating switch in the circuit as where resistance, After rectification circuit outputting current steadily, control gating switch is in off state, reduces the circuit in precharge unit Loss.
In addition, precharge unit further includes gating switch；Second control terminal of main control unit and the control terminal of gating switch Connection；Gating switch is serially connected between the anode of thyristor and the second end of current-limiting resistance；Alternatively, gating switch be serially connected in it is onboard Between the first end of Switching Power Supply and the second end of current-limiting resistance.
In addition, including equalizer circuit and inverter circuit in inversion unit；Equalizer circuit is connected in parallel in inverse with inverter circuit Become between the first end of unit and the second end of inversion unit.
In addition, equalizer circuit includes that the first pressure component and second presses component；First presses component and the second equal pressure group Part is connected in series between the first end of inversion unit and the second end of inversion unit.
In the embodiment, the first pressure component is identical as the second pressure structure of component, so that two in inversion unit A capacitor shares voltage, increases the service life of each capacitor.
In addition, the first pressure component includes: first capacitor and first resistor；Second pressure component includes the second capacitor and the Two resistance；First capacitor and first resistor are connected in parallel, and the second capacitor is connected in parallel with second resistance.
In addition, thyristor gating circuit include: 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, third capacitor, 4th capacitor and the first optocoupler assembly；The first end of 3rd resistor and the first control terminal of main control unit connect, the 4th resistance with Third capacitor is connected in parallel between the second end of 3rd resistor and ground terminal, the first end of third capacitor and the first optocoupler assembly First end connection, the second end of told third capacitor connect with the second end of the first optocoupler assembly, the of the first optocoupler assembly Three ends are connect as the power end of IGBT group with the second output terminal of onboard Switching Power Supply, the 4th end of the first optocoupler assembly It being connect with the first end of the 5th resistance, the 5th end of the first optocoupler assembly and the cathode of thyristor connect, and the second of the 5th resistance End is connect with the grid of thyristor, and the 6th resistance and the 4th capacitor are parallel between grid and cathode respectively.
In addition, precharge unit further includes control relay circuit if gating switch is relay；The first end of relay It is connect with the first end of rectification unit, the second end of relay and the first end of current-limiting resistance connect, control relay circuit The first end of the coil of first end and relay connects, the second end of the coil of the second end and relay of control relay circuit Second control terminal of connection, the control terminal of control relay circuit and main control unit connects, the anode of control relay circuit with First output end of onboard Switching Power Supply connects, and the third output end of the cathode of control relay circuit and onboard Switching Power Supply connects It connects.
In addition, control relay circuit include: the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 5th capacitor, 6th capacitor, the second optocoupler assembly, diode and triode；The first end of 7th resistance and the second control terminal of main control unit connect It connects, the 8th resistance and the 5th capacitor are connected in parallel between the second end and ground terminal of the 7th resistance, the first end of the 5th capacitor It is connect with the first end of the second optocoupler assembly, tells that the second end of the 5th capacitor is connect with the second end of the second optocoupler assembly, the The third end of two optocoupler assemblies is connect with the first end of the 9th resistance, and the second end of the 9th resistance is as control relay circuit Positive to connect with the first output end of onboard Switching Power Supply, the 4th end of the second optocoupler assembly and the base stage of triode connect, the Ten resistance and the 6th capacitor are connected in parallel between the base stage of triode and emitter, and the emitter of triode is as relay control The cathode of circuit processed is connect with the third output end of onboard Switching Power Supply, the anode of diode as control relay circuit One end is connect with the first end of the collector of triode and relay coil respectively, and the cathode of diode controls electricity as relay The second end on road is connect with the second end of the second end of relay coil and the 9th resistance respectively.
In addition, onboard Switching Power Supply includes: the secondary coil of the first main coil and at least two；First main coil is located at onboard The main side of Switching Power Supply, the first end and second end of the first main coil are connect with the first end and second end of rectification unit respectively； At least two secondary coil is respectively arranged at the secondary side of onboard Switching Power Supply.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is pre-charge circuit structure in the existing frequency converter in background of invention part；
Fig. 2 is the structure chart of the first frequency converter pre-charge system in first embodiment of the invention；
Fig. 3 is the structure chart of the second frequency converter pre-charge system in first embodiment of the invention；
Fig. 4 is the structure chart of third frequency converter pre-charge system in first embodiment of the invention；
Fig. 5 is the structure chart of the 4th frequency converter pre-charge system in first embodiment of the invention；
Fig. 6 is the circuit structure diagram of onboard Switching Power Supply in first embodiment of the invention；
Fig. 7 is the structure chart of the 5th frequency converter pre-charge system in first embodiment of the invention；
Fig. 8 is the circuit structure diagram of thyristor gating circuit in second embodiment of the invention；
Fig. 9 is the circuit structure diagram of control relay circuit in second embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, " Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.
The first embodiment of the present invention is related to a kind of frequency converter pre-charge systems, are applied to middle power inverter or big function Rate frequency converter, system structure are as shown in Figure 2.The frequency converter pre-charge system include: rectification unit 10, precharge unit 20, Inversion unit 30 and main control unit 40.
The connection of the power supply of 10 input terminal of rectification unit and three-phase alternating current, the first end and precharge unit of rectification unit 10 20 first input end connection, the second end of rectification unit 10 are connect with the first output end of precharge unit 20, and precharge is single First output end of member 20 is connect with the first end of inversion unit 30, the second input terminal and inversion unit 30 of precharge unit 20 Second end connection.
Precharge unit 20 includes thyristor T1, thyristor gating circuit 21, onboard Switching Power Supply 22 and current-limiting resistance R, Thyristor gating circuit 21 is connected between the grid G of thyristor T1 and cathode K.The specific structure of precharge unit 20 is corresponding System structure is as shown in Figure 3 and Figure 4, wherein first input of the first end of onboard Switching Power Supply 22 as precharge unit 20 End is connect with the first end of rectification unit 10, first output end of the second end of onboard Switching Power Supply 22 as precharge unit 20 It is connect with the second end of rectification unit；Current-limiting resistance R be serially connected with onboard Switching Power Supply 22 first end and inversion unit 30 the Between one end, first output end of the first end of current-limiting resistance R as precharge unit 20；Diagram 3 in thyristor T1 anode and Cathode is connected in parallel between the first end of current-limiting resistance R and the second end of current-limiting resistance R；Alternatively, thyristor T1 in diagram 4 Cathode and anode series are between the second end of onboard Switching Power Supply 22 and the second end of inversion unit 30.
The power end of main control unit 40 is connect with the first output end of onboard Switching Power Supply 22, and main control unit 40 first controls End is connect with the control terminal of thyristor gating circuit 21.
Onboard Switching Power Supply 22 obtains the output voltage of rectification unit 10, and out-put supply is passed through the by onboard Switching Power Supply 22 One output end is transmitted to main control unit 40, and main control unit 40 determines that frequency converter normal operation, main control unit 40 issue the first control Signal controls thyristor T1 by thyristor gating circuit 21 and is in off state, main control unit to thyristor gating circuit 21 40 determine that the both end voltage value of inversion unit 30 is preset voltage value, and main control unit 40 issues second control signal to thyristor and touches It is in the conductive state to control thyristor T1 by thyristor gating circuit 21 for Power Generation Road 21.
Wherein, inversion unit, 30 three-phase output end are needed to connect with load, be negative in the work of frequency converter The voltage signal after frequency conversion is provided is carried, further includes load 50 in diagram, the three-phase output end of inversion unit is connect with load 50.It should Load can be with equipment such as motors.
It should be noted that the frequency converter pre-charge system in present embodiment is mainly applied to middle power or high-power Frequency converter, the pre-charge system in parallel with resistive element compared to traditional relay, effectively reduces the volume of frequency converter, is to become Smaller, the more compact structure of frequency device, wherein main control unit 40 be mainly used for the pre-charge process in pre-charge system into Row control, after the electricity work of main control unit 40, it is necessary first to carry out initial state detection to frequency converter, determine frequency convertor system Control pre-charge system works after normal, and therefore, main control unit 40 also needs and rectification unit 10 and inversion unit 30 There are communication connection, it is not shown in diagram 3 and diagram 4.
Frequency converter pre-charge system in first embodiment of the invention is main to be theed improvement is that, single in precharge Setting thyristor T1 is used to control the excessive problem of the instantaneous current value after rectification unit 10 rectifies in member 20, and in arranging plate Load switch power supply 22 in precharge control circuit, by onboard Switching Power Supply 22 first it is electric, later main control unit 40 it is electric, and Start to be pre-charged in the case where main control unit 40 determines frequency converter normal operation, improve the safety of frequency converter, reduces first The probability of damage is powered on, and can be avoided the excessive the phenomenon that causing circuit to damage of electric current in pre-charge circuit.It below will be to this reality The specific implementation for applying mode is illustrated, and is mainly illustrated based on circuit shown in Fig. 3, it will be understood that specific Implementation can also be applied in circuit shown in Fig. 4, the following contents only for convenience of understand provide realization details, be not Present embodiment it is necessary.
In specific implementation, after precharge is completed, thyristor T1 is in the conductive state, and current-limiting resistance R is short-circuited, in order to It determines that current-limiting resistance R is not linked into circuit, influences circuit efficiency, concatenate a gating in the branch where current-limiting resistance R Switch K1, in a specific implementation, precharge unit 20 further includes gating switch K1；As shown in figure 5, the second of main control unit 40 Control terminal is connect with the control terminal of gating switch K1；Gating switch K1 be serially connected in thyristor T1 anode and current-limiting resistance R Between two ends；Alternatively, gating switch K1 is serially connected between the first end of onboard Switching Power Supply 22 and the second end of current-limiting resistance.
It is noted that gating switch is the branch where being serially connected in current-limiting resistance, this sentences Fig. 5 and is illustrated, if Thyristor is serially connected between the second end of onboard Switching Power Supply and the second end of inversion unit, then the position of thyristor will not shadow Ring the position of gating switch.
Specifically, the first output end of onboard Switching Power Supply 22 is connect with the control terminal of gating switch K1, onboard switch The second output terminal of power supply 22 is connect with the power end of thyristor gating circuit 21.
In specific implementation, onboard Switching Power Supply 22 is the structure for including main and sub-coil, onboard Switching Power Supply as shown in FIG. 6 22 structural representations, the first end of rectification unit 10 are set as positive bus-bar PA, and the second end of rectification unit 10 is set as negative busbar, inversion list The first end of member 30 is positive bus-bar PB, then the main side of onboard Switching Power Supply 22 is separately connected positive bus-bar PA and negative busbar, wherein onboard Switching Power Supply 22 includes: the secondary coil of the first main coil and at least two；First main coil is located at the master of onboard Switching Power Supply 22 Side, the first end and second end of the first main coil are connect with the first end and second end of rectification unit 10 respectively；At least two Secondary coil is respectively arranged at the secondary side of onboard Switching Power Supply 22.For example, if the control terminal voltage of thyristor gating circuit is in Fig. 6 + 15V, the output voltage of the first secondary coil output end are+15V, the electricity of the first secondary coil output end and thyristor gating circuit 21 Source connection.The control terminal voltage of gating switch K1 is 24V, and the output voltage of the second secondary coil output end is 24V, setting second The output end of secondary coil is connect with the control terminal of gating switch K1.
In specific implementation, inversion unit 30 is used to the pulse voltage that rectification unit 10 transmits being converted to alternating current, specifically Ground is said, includes in inversion unit 30, equalizer circuit and inverter circuit；Its circuit structure is as shown in fig. 7, equalizer circuit and inversion electricity Road is connected in parallel between the first end of inversion unit 30 and the second end of inversion unit 30, and the output end of inverter circuit is three-phase Output end is connect with load 50.Equalizer circuit includes that the first pressure component and second presses component；First presses component and second Pressure component is connected in series between the first end of inversion unit 30 and the second end of inversion unit 30.It is arranged two herein to press Component is a kind of illustrative explanation, specifically presses the number of component with no restrictions.In one specific implementation, first presses component It include: first capacitor C1 and first resistor R1；Second pressure component includes the second capacitor C2 and second resistance R2；First capacitor C1 It is connected in parallel with first resistor R1, the second capacitor is connected in parallel with second resistance R2.
In specific implementation, the current-limiting resistance R in precharge unit 20 is used to carry out the capacity cell in inversion unit 30 The charging current in reduction circuit is carried out when charging, current-limiting resistance R can also be the resistance unit that multiple resistance are composed in series, It is only example herein, is not particularly limited.Wherein, inversion unit 30 is also possible to multiple capacity cells and is cascaded, e.g., two A capacitor is cascaded, and a resistance in parallel forms an equalizer circuit, the capacity of two capacity cells to each capacitor respectively Identical, the resistance value of two resistance is also identical, for example, the capacity of selection capacitor is big, the low alminium electrolytic condenser of voltage.Two electricity are set The capacitance for holding each capacity cell of element is identical, so that the charging voltage that each capacitor is born is identical, increases making for capacitor Use the service life.
It should be noted that the above is only limit for example, not constituting to technical solution of the present invention.
In terms of existing technologies, thyristor is set in precharge unit, and main control unit passes through thyristor gating circuit The state of thyristor is controlled, realizes the control to the charging current of inversion unit, rectification unit in converter circuit is avoided to complete The electric current of rectification is directly transferred to inverter circuit due to instantaneous current value larger the phenomenon that causing converter circuit to be damaged, by In the small volume of thyristor, and it can adapt to the working environment of high current, so that the change of the frequency converter pre-charge system is arranged Frequency body product reduces, more compact in structure, is additionally provided with gating switch in the circuit as where resistance, exports in rectification circuit After electric current is stablized, control gating switch is in off state, reduces the circuit loss in precharge unit.
Second embodiment of the present invention is related to a kind of frequency converter pre-charge system, and second embodiment is implemented first Thyristor gating circuit 21 and gating switch K1 are specifically described on the basis of mode, to frequency converter in present embodiment The specification specified of pre-charge system is merely illustrative, is not intended to specifically limit.
In specific implementation, thyristor gating circuit 21 includes: 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th Resistance R6, third capacitor C3, the 4th capacitor C4 and the first optocoupler assembly, circuit structure as shown in figure 8,3rd resistor R3 One end is connect with the first control terminal of main control unit 40, and the 4th resistance R4 and third capacitor C3 are connected in parallel in 3rd resistor R3's Between second end and ground terminal GND, the first end of third capacitor C3 is connect with the first end of the first optocoupler assembly, told third electricity The second end for holding C3 is connect with the second end of the first optocoupler assembly, electricity of the third end of the first optocoupler assembly as IGBT group Source is connect with the second output terminal of onboard Switching Power Supply 22, the first end at the 4th end and the 5th resistance R5 of the first optocoupler assembly Connection, the 5th end of the first optocoupler assembly are connect with the cathode of thyristor T1, and the second end of the 5th resistance R5 is with thyristor T1's Grid connection, the 6th resistance R6 and the 4th capacitor C4 are parallel to respectively between grid G and cathode K.
Control in thyristor gating circuit by driving the first optocoupler assembly realization to thyristor T1, wherein onboard to open Powered-down source 22 is used to export+15V voltage and provides energy for the conducting for thyristor T1, and third capacitor C3 main function is filtering Capacitor prevents thyristor T1 from misleading；5th resistance R5, the 6th resistance R6 are current-limiting resistance, and the 4th capacitor C4 is for filtering out electricity Interference signal in road, thyristor T1 anode is expressed as A in illustrated circuit, and cathode is expressed as K, and grid is expressed as G.
In one specific implementation, gating switch K1 is set as relay, wherein the main function of gating switch K1 is pre- After charging complete, the power consumption of circuit, gating switch are reduced so that current-limiting resistance R is no longer accessed in circuit in off state K1 can also be set as needed as other switch elements, be only example herein.If gating switch K1 is relay, precharge is single Member 20 further includes control relay circuit；The first end of relay is connect with the first end of rectification unit 10, and the second of relay End is connect with the first end of current-limiting resistance R, the first end connection of the coil of the first end and relay of control relay circuit, after The second end of the coil of the second end and relay of electrical apparatus control circuit connects, the control terminal and master control list of control relay circuit The second control terminal connection of member 40, the anode of control relay circuit are connect with the first output end of onboard Switching Power Supply 22, after The cathode of electrical apparatus control circuit is connect with the third output end of onboard Switching Power Supply 22.
Control relay circuit includes: the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 5th Capacitor C5, the 6th capacitor C6, the second optocoupler assembly, diode D1 and triode Q1, specific circuit structure as shown in figure 9, The first end of 7th resistance R7 is connect with the second control terminal of main control unit 40, and the 8th resistance R8 and the 5th capacitor C5 is connected in parallel Between the second end and ground terminal GND of the 7th resistance R7, the first end of the 5th capacitor C5 and the first end of the second optocoupler assembly Connection, tell that the second end of the 5th capacitor C5 is connect with the second end of the second optocoupler assembly, the third end of the second optocoupler assembly and The first end of 9th resistance R9 connects, anode and onboard switch electricity of the second end of the 9th resistance R9 as control relay circuit The 24V voltage of first output end in source 22 connects, and the 4th end of the second optocoupler assembly is connect with the base stage of three pole Q1 pipes, the tenth electricity Resistance R10 and the 6th capacitor C6 is connected in parallel between the base stage and emitter of triode Q1, the emitter of triode Q1 be used as after The cathode of electrical apparatus control circuit is connect with the 24V_GND of the third output end of onboard Switching Power Supply 22, and the anode of diode D1 is made It is connect respectively with the first end of the collector of triode Q1 and relay coil for the first end of control relay circuit, diode The cathode of D1 as control relay circuit second end respectively with the second end of relay coil and the 9th resistance R9 second End connection.
Wherein, the 24V voltage that onboard Switching Power Supply 22 is transmitted is used to power for the control coil of relay, and triode is used for The on or off of relay coil and 24V power supply is controlled, diode is used to when relay coil and 24V voltage disconnect be line Enclose afterflow.
It is noted that each circuit unit involved in present embodiment is electronic circuit module, in reality In, an electronic circuit module can be a part of a physical unit, can also be what multiple electrical combinations were realized, For in each electronic circuit specific type selecting and structure without limitation, it can be achieved that corresponding function, in addition, in order to protrude this The innovative part of invention, in present embodiment there is no by with to solve technical problem relationship proposed by the invention less close Unit introduces, it is not intended that there is no other units in the transformer pre-charge system in present embodiment.
Third embodiment of the invention is related to a kind of frequency converter, including the change mentioned in above-mentioned first or second embodiment Frequency device pre-charge system.
Specifically, main control unit 40 for realizing the control to pre-charge method, specific implementation includes: in the frequency converter After frequency convertor system powers on, the master control system of frequency converter obtain it is electric, to frequency converter carry out initial state detection, determine frequency converter system After system is normal, frequency converter issues first control signal to gating switch K1, effect of the gating switch K1 in first control signal Under it is in the conductive state, frequency converter issues second control signal to thyristor gating circuit 21, and thyristor gating circuit 21 is the Control thyristor T1 is in off state under the action of two control signals, so that the three-phase alternating current that the rectification of rectification unit 10 terminates The capacitor member in inverter circuit can be avoided by be transmitted to inverter circuit after current-limiting resistance R later by being converted to pulse current Part obtains 30 first end of inversion unit and 30 second end of inversion unit because of the device in the instantaneous excessive damage circuit of charging current Between voltage value, if the voltage value reaches preset voltage value, that is, determine inverter circuit can be with steady operation after, main control unit 40 It issues third and controls signal to gating switch K1, gating switch K1 is under the action of third controls signal in off state, master It controls unit 40 and issues the 4th control signal to thyristor gating circuit 21, work of the thyristor gating circuit 21 in the 4th control signal It is in the conductive state with lower control thyristor T1.At this point, the precharge work of frequency converter is completed, the three-phase that inversion unit 30 exports Electricity works for band dynamic load 50.
Specifically, main control unit 40 just starts to work after determining that system initial state is in normal condition, it can With reduce frequency converter it is initial when the failure rate damaged.After determining that precharge is completed, cutting current-limiting resistance R reduces frequency converter Idling consumption.When frequency converter is in standby, i.e. three-phase input plant-grid connection frequency converter, but frequency converter does not have power output When, because the onboard Switching Power Supply 22 of frequency converter takes electricity before charging circuit, the control system of frequency converter can work independently, so Control system and power system can be separated, idling consumption caused by reducing because of charging resistor
It is not difficult to find that present embodiment is Installation practice corresponding with first embodiment, present embodiment can be with First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in In first embodiment.
In addition, it will be understood by those skilled in the art that realizing in the control method in above-described embodiment in main control unit 40 All or part of the steps be that relevant hardware can be instructed to complete by program, which is stored in a storage medium In, including some instructions use is so that an equipment (can be single-chip microcontroller, chip etc.) or processor (processor) execute sheet Apply for all or part of the steps of each embodiment the method.And storage medium above-mentioned include: read-only memory (ROM, Read-Only Memory) or random access memory (RAM, Random Access Memory) etc. is various can store program The medium of code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention, And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
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| CN201811531209.5A CN109586557A (en) | 2018-12-14 | 2018-12-14 | A kind of frequency converter pre-charge system and frequency converter |
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Cited By (1)
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| CN110768254A (en) * | 2019-11-18 | 2020-02-07 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
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