CN114785165A - Alternating current/direct current converter, power supply module and fault detection method thereof - Google Patents
Alternating current/direct current converter, power supply module and fault detection method thereof Download PDFInfo
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- CN114785165A CN114785165A CN202210694484.9A CN202210694484A CN114785165A CN 114785165 A CN114785165 A CN 114785165A CN 202210694484 A CN202210694484 A CN 202210694484A CN 114785165 A CN114785165 A CN 114785165A
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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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
Abstract
The embodiment of the invention relates to the technical field of power supplies and discloses an alternating current/direct current converter, a power supply module and a fault detection method thereof, wherein the converter comprises at least two three-phase input conversion modules, a direct current output module and a control module, each three-phase input conversion module comprises a shunt filter circuit, a rectifying circuit and a first DC/DC conversion circuit which are sequentially connected, the input end of the shunt filter circuit is connected with a three-phase alternating current power supply, and the output end of the first DC/DC conversion circuit is connected with the direct current output module And if the power module fails, the self-checking of the power module is realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to an alternating current/direct current converter, a power supply module and a fault detection method thereof.
Background
With the development of new infrastructure, the related technologies such as a 5G base station, an IDC data center, a new energy automobile and the like have been increased explosively in recent years, and accordingly, the demand for medium-high power supply equipment is increased day by day. In some data center power architectures, an ac/dc converter is typically required, the input to which is stepped down from a 10kV medium voltage network via a phase-shifting transformer.
In implementing the embodiments of the present invention, the inventors have found that at least the following problems exist in the above related art: the existing alternating current/direct current converter applied to high-power scenes such as a data center and the like has the defects that the three-phase line voltage is very low and the three-phase line current is large after voltage reduction, the size of an input fuse needed to be adopted is large, the cost is high, the converter is difficult to meet performance requirements of low cost, high efficiency, high performance and the like, and the fault condition needs to be detected by a diagnosis device when the converter breaks down.
Disclosure of Invention
The embodiment of the application provides a high-efficiency and high-performance alternating current/direct current converter, a power module and a fault detection method thereof.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides an ac/dc converter, including: the three-phase input conversion module comprises a shunt filter circuit, a rectifying circuit and a first DC/DC conversion circuit which are sequentially connected, the input end of the shunt filter circuit is connected with a three-phase alternating current power supply, the output end of the first DC/DC conversion circuit is connected with the DC output module, the detection end of the control module is respectively connected with the output end of the rectifying circuit in each three-phase input conversion module to acquire rectified voltage, and the control module is configured to judge whether the connection of the alternating current/direct current converter and the three-phase alternating current power supply fails or not according to the rectified voltage.
In some embodiments, the detection terminal of the control module is further connected to the input terminal of the shunt filter circuit in each of the three-phase input conversion modules to collect a three-phase input voltage, and the control module is further configured to determine a specific fault condition according to the three-phase input voltage and the rectified voltage.
In some embodiments, the DC output module includes a bus filter circuit, a second DC/DC conversion circuit, and an output filter circuit, which are connected in sequence, wherein an input terminal of the bus filter circuit is connected to an output terminal of the first DC/DC conversion circuit in each of the three-phase input conversion modules, and an output terminal of the output filter circuit is used for outputting DC power.
In some embodiments, the bus filter circuit comprises: a first diode, the cathode of which is respectively connected with the anode output end of the first DC/DC conversion circuit in each three-phase input conversion module; one end of the first filter capacitor is connected with the anode of the first diode, and the other end of the first filter capacitor is respectively connected with the cathode output end of the first DC/DC conversion circuit in each three-phase input conversion module; a pre-charge resistor connected in parallel with the first diode; a pre-charge relay connected in parallel with the first diode.
In some embodiments, the shunt filter circuit includes three filter units of the same structure respectively connected to three-phase outputs of the three-phase ac power supply, each of the filter units includes a first fuse and a first inductor connected in series, and the first fuse is connected to each phase output of the three-phase ac power supply.
In some embodiments, the rectifier circuit is a three-phase uncontrolled rectifier bridge composed of diodes, the rectifier circuit includes three groups of diodes connected in parallel, each group of diodes includes two diodes connected in series, and in a single three-phase input conversion module, three output terminals of the shunt filter circuit are correspondingly connected with the three groups of diodes in the rectifier circuit and are connected between the two diodes connected in series.
In some embodiments, the first DC/DC conversion circuit includes a plurality of first transforming units arranged in parallel, the first transforming units including: the second filter capacitor is connected between the positive and negative output ends of the shunt filter circuit in parallel; one end of the second fuse is connected with one end of the second filter capacitor; one end of the second inductor is connected with the other end of the second fuse; the anode of the second diode is connected with the other end of the second inductor, and the cathode of the second diode is connected with the anode input end of the direct current output module; and one end of the first switch tube is connected between the other end of the second inductor and the anode of the second diode, and the other end of the first switch tube is connected with the other end of the second filter capacitor and the negative input end of the direct current output module.
In some embodiments, the control module is configured to output a first driving signal to the first switching transistor to control the voltage transformation of the first DC/DC conversion circuit, and there are, between driving sequences of the first driving signal output to a single first voltage transformation unit, a phase shift Ts/n between driving sequences of the first driving signal output to first voltage transformation units in two adjacent first DC/DC conversion circuits, a phase shift 0.5Ts/n between driving sequences of the first driving signal output to first voltage transformation units in two adjacent first DC/DC conversion circuits, where Ts represents a driving period of the first driving signal, n represents a driving sequence of the first voltage transformation unit in each first DC/DC conversion circuit, and n is a positive integer.
In some embodiments, the second DC/DC conversion circuit includes a plurality of second transforming units arranged in parallel, and the second transforming units include: the third filter capacitor is connected between the positive and negative output ends of the bus filter circuit in parallel; a third diode, a cathode of which is connected with one end of the third filter capacitor; one end of the second switch tube is connected with the other end of the third filter capacitor, and the other end of the second switch tube is connected with the anode of the third diode; one end of the third fuse is connected between the other end of the second switch tube and the anode of the third diode; one end of the third inductor is connected with the other end of the third fuse; and one end of the fourth filter capacitor is connected between the positive electrode output end of the bus filter circuit and the positive electrode input end of the output filter circuit, and the other end of the fourth filter capacitor is connected between the other end of the third inductor and the negative electrode input end of the output filter circuit.
In some embodiments, the control module is configured to output a second driving signal to the second switching tube to control the transformation condition of the second DC/DC conversion circuit, and there are driving sequences of the second driving signal output to the second transformation unit that are mutually out-of-phase Ts1/n, where Ts1 represents a driving period of the second driving signal, n represents a driving sequence of the second transformation unit in each second DC/DC conversion circuit, and n is a positive integer.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a power module, which includes the ac/dc converter according to the first aspect.
In order to solve the above technical problem, in a third aspect, an embodiment of the present invention provides a method for detecting a fault of a power module, where the method is applied to the power module according to the second aspect, and the method includes: collecting rectified voltages output by rectifying circuits in three-phase input conversion modules in the alternating current/direct current converter; the collected numerical values of the rectified voltages are subtracted in pairs to obtain difference values, and whether the difference values are within a preset voltage difference range or not is judged; and if not, determining that the connection between the alternating current/direct current converter and the three-phase alternating current power supply has a fault.
In some embodiments, the method further comprises: collecting three-phase input voltage input by the input end of each filter circuit in the alternating current/direct current converter; and determining the specific fault condition existing between the three-phase alternating current power supply and each three-phase input conversion module according to the deviation condition of the difference value and the preset voltage difference range and/or the three-phase input voltage.
Compared with the prior art, the invention has the beneficial effects that: different from the prior art, the embodiment of the invention provides an alternating current/direct current converter, a power supply module and a fault detection method thereof, wherein the converter comprises at least two three-phase input conversion modules, a direct current output module and a control module, each three-phase input conversion module comprises a shunt filter circuit, a rectifying circuit and a first DC/DC conversion circuit which are sequentially connected, the input end of the shunt filter circuit is connected with a three-phase alternating current power supply, the output end of the first DC/DC conversion circuit is connected with the direct current output module, the converter provided by the embodiment of the invention modulates the input shunt of the three-phase alternating current power supply, the load requirement on electronic components is lower, the cost of the converter is lower, and the detection end of the control module is respectively connected with the output end of the rectifying circuit in each three-phase input conversion module to collect rectified voltage, and the control module is configured to judge whether the connection between the alternating current/direct current converter and the three-phase alternating current power supply fails according to the rectified voltage, so that the fault self-checking of the power supply module is realized.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a block diagram of an ac/dc converter according to an embodiment of the present invention;
FIG. 2 is a block circuit diagram of a three-phase input conversion module and a DC output module of the AC/DC converter shown in FIG. 1;
fig. 3(a) is a block diagram of a circuit of a three-phase input conversion module and a part of a circuit of a dc output module in the ac/dc converter shown in fig. 1;
FIG. 3(b) is a block diagram of another circuit of a DC output module of the AC/DC converter shown in FIG. 1;
fig. 4 is a waveform diagram of a first driving signal for input to each first transforming unit in fig. 3 (a);
fig. 5 is a waveform diagram of a second driving signal for input to each second transforming unit in fig. 3 (b);
fig. 6 is a schematic structural diagram of a power module according to a second embodiment of the present invention;
fig. 7 is a flowchart of a method for detecting a fault of a power module according to a third embodiment of the present invention;
fig. 8 is a flowchart of another method for detecting a fault of a power module according to a third embodiment of the present invention;
FIG. 9(a) is a normal state in which there is no connection failure in the power module shown in FIG. 6;
FIG. 9(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in FIG. 9 (a);
fig. 10(a) shows a fault state that the phase a copper bar is disconnected from the port a2 in the power module shown in fig. 6;
FIG. 10(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in FIG. 10 (a);
fig. 11(a) shows a fault state that the B-phase copper bar and the B2 port are disconnected in the power module shown in fig. 6;
FIG. 11(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in FIG. 11 (a);
fig. 12(a) shows a fault state in which the C-phase copper bar and the C2 port are disconnected in the power module shown in fig. 6;
FIG. 12(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in FIG. 12 (a);
fig. 13(a) shows a fault state in which an ac input between two three-phase input conversion modules in the power module shown in fig. 6 is short-circuited and connected erroneously;
FIG. 13(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in FIG. 13 (a);
fig. 14(a) shows a fault state of a single-phase poor connection in the power module shown in fig. 6;
fig. 14(b) is a waveform diagram of the rectified voltage and the three-phase input voltage in the connected state shown in fig. 14 (a).
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in device schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in a different order than the block divisions in devices, or in flowcharts. Further, the terms "first," "second," "third," and the like, as used herein do not limit the order of data and execution, but merely distinguish between identical or similar items that have substantially the same function or effect. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problem that the existing high-power AC/DC converter cannot meet the requirements of high performance, high efficiency and low cost at the same time and the problem that the fault condition needs to be detected through external diagnostic equipment, the embodiment of the invention provides the AC/DC converter, a power supply module and a fault detection method thereof, the distribution of input total current is realized by arranging at least two three-phase input conversion modules, so that the use cost of electronic components can be reduced, the highest efficiency can reach more than 98%, the high-efficiency and high-performance advantages are achieved, and whether the connection of the AC/DC converter and a three-phase AC power supply has faults or not and the fault condition can be determined by detecting the rectified voltage of the output end of a rectifying circuit in each three-phase input conversion module, so that the fault self-detection is realized.
Specifically, the embodiments of the present invention are further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides an ac/dc converter, please refer to fig. 1 and fig. 2, where fig. 1 shows a structural block diagram of an ac/dc converter provided by an embodiment of the present invention, fig. 2 shows a circuit block diagram of a three-phase input conversion module 110 and a dc output module 120 in the ac/dc converter shown in fig. 1, and the ac/dc converter 100 includes: the three-phase converter comprises at least two three-phase input conversion modules 110, a direct current output module 120 and a control module 130, wherein each three-phase input conversion module 110 comprises a shunt filter circuit 111, a rectifying circuit 112 and a first DC/DC conversion circuit 113 which are sequentially connected, the input end of the shunt filter circuit 111 is connected with a three-phase alternating current power supply 200, the output end of the first DC/DC conversion circuit 113 is connected with the direct current output module 120, the detection end of the control module 130 is respectively connected with the output end of the rectifying circuit 112 in each three-phase input conversion module 110 to acquire rectified voltage, and the control module 130 is configured to judge whether the connection of the alternating current/direct current converter 100 and the three-phase alternating current power supply 200 fails according to the rectified voltage.
The control module 130 at least includes a processor and a memory, which are connected in communication, and the processor can execute instructions stored in the memory, thereby performing the fault detection operation. Wherein the memory is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules; the processor executes various functional applications of the server and data processing by executing nonvolatile software programs, instructions, and modules stored in the memory. The processor or chip used by the control module 130 can be selected according to actual needs.
In the example shown in fig. 2, two three-phase input conversion modules 110 are taken as an example, and the circuit structures in two groups of three-phase input conversion modules 110 are distinguished by suffixes "a" and "b", in other embodiments, the number of the three-phase input conversion modules 110 may be set according to actual needs, and the three-phase input conversion modules 110 may be set in parallel, which is not limited by the embodiment of the present invention.
In some embodiments, with continued reference to fig. 1, the detection terminal of the control module 130 is further connected to the input terminal of the shunt filter circuit 111 in each of the three-phase input transformation modules 110 to collect a three-phase input voltage, and the control module 130 is further configured to determine a specific fault condition according to the three-phase input voltage and the rectified voltage.
In some embodiments, with reference to fig. 2, the DC output module 120 includes a bus filter circuit 121, a second DC/DC conversion circuit 122, and an output filter circuit 123 connected in sequence, where an input end of the bus filter circuit 121 is connected to an output end of the first DC/DC conversion circuit 113 in each three-phase input conversion module 110, and an output end of the output filter circuit 123 is used for outputting a direct current.
In the embodiment of the present invention, the first DC/DC converter circuit 113 is a voltage boosting circuit, and the second DC/DC converter circuit 122 is a voltage dropping circuit, but in some other embodiments, other cases may be possible, for example, when the first DC/DC converter circuit 113 is provided as a voltage dropping circuit and the second DC/DC converter circuit 122 is provided as a voltage boosting circuit, and specifically, the transformation types of the first DC/DC converter circuit 113 and the second DC/DC converter circuit 122 may be provided according to actual needs, and are not limited to the embodiment of the present invention.
In some embodiments, please refer to fig. 3(a) and fig. 3(b), wherein fig. 3(a) shows a part of a circuit structure diagram of the dc output module 120 and a circuit of the three-phase input conversion module 110 in the ac/dc converter shown in fig. 1, and fig. 3(b) shows a part of a circuit structure diagram of the dc output module 120 in the ac/dc converter shown in fig. 1, and the bus filter circuit 121 includes: a first diode D1 having a cathode connected to a positive output terminal of the first DC/DC conversion circuit 113 in each of the three-phase input conversion modules 110; a first filter capacitor C1, one end of which is connected to the anode of the first diode D1, and the other end of which is connected to the cathode output terminal of the first DC/DC conversion circuit 113 in each three-phase input conversion module 110; a pre-charge resistor R1 connected in parallel with the first diode D1; a pre-charge relay K1 connected in parallel with the first diode D1.
In some embodiments, with continued reference to fig. 3(a), the shunt filter circuit 111 includes three filter units with the same structure respectively connected to three-phase outputs (a-phase, B-phase, and C-phase) of the three-phase ac power source 200, each of the filter units includes a first fuse F1 and a first inductor L1 connected in series, and the first fuse F1 is connected to each phase output of the three-phase ac power source 200.
In some embodiments, with continued reference to fig. 3(a), the rectification circuit 112 is a three-phase uncontrolled rectifier bridge composed of diodes, the rectification circuit 112 includes three sets of parallel diode sets, each of the diode sets includes two diodes connected in series, and in a single three-phase input transformation module 110, three output terminals of the shunt filter circuit 111 are correspondingly connected to the three sets of diode sets in the rectification circuit 112 and are connected between the two diodes connected in series.
In some embodiments, please continue to refer to fig. 3(a), the first DC/DC converting circuit 113 includes a plurality of first transforming units 113A/113B arranged in parallel, and the first transforming units 113A/113B include: the second filter capacitor C2 is connected in parallel between the positive and negative output ends of the shunt filter circuit 111; a second fuse F2, one end of which is connected to one end of the second filter capacitor C2; a second inductor L2, one end of which is connected to the other end of the second fuse F2; a second diode D2, an anode of which is connected to the other end of the second inductor L2, and a cathode of which is connected to the positive input terminal of the dc output module 120; and a first switching tube Q1, one end of which is connected between the other end of the second inductor L2 and the anode of the second diode D2, and the other end of which is connected to the other end of the second filter capacitor C2 and the negative input end of the dc output module 120.
In some embodiments, referring to fig. 4, which shows a waveform diagram of the first driving signal for inputting to each first transforming unit 113A/113B in fig. 3(a), the control module 130 is configured to output the first driving signal to the first switch Q1 to control the transforming situation of the first DC/DC converting circuit 113, and there are, between driving sequences of the first driving signals output to a single first transforming unit 113A/113B, between driving sequences of the first driving signals output to the first transforming units 113A/113B in two adjacent first DC/DC converting circuits 113, mutually staggered by 0.5Ts/n, that is, between driving sequences of the first driving signals output to the first transforming unit 113A and two first driving signals output to the first transforming unit 113B, mutually staggered by 0.5Ts/n, where Ts denotes a driving period of the first driving signal input to the first switching tube Q1, n denotes a driving sequence of the first transforming units 113A/113B in each of the first DC/DC converting circuits 113, and n is a positive integer, that is, n =1,2,3 ….
In some embodiments, please continue to refer to fig. 3(b), the second DC/DC converting circuit 122 includes a plurality of second transforming units 122A arranged in parallel, and the second transforming units 122A include: a third filter capacitor C3 connected in parallel between the positive and negative output terminals of the bus filter circuit 121; a third diode D3 having a cathode connected to one end of the third filter capacitor C3; a second switching tube Q2, one end of which is connected to the other end of the third filter capacitor C3, and the other end of which is connected to the anode of the third diode D3; a third fuse F3 having one end connected between the other end of the second switching tube Q2 and the anode of the third diode D3; a third inductor L3, one end of which is connected to the other end of the third fuse F3; and a fourth filter capacitor C4, one end of which is connected between the positive output terminal of the bus filter circuit 121 and the positive input terminal of the output filter circuit 123, and the other end of which is connected between the other end of the third inductor L3 and the negative input terminal of the output filter circuit 123.
In some embodiments, referring to fig. 5, which shows a waveform diagram of the second driving signal for inputting to each second voltage transforming unit 122A in fig. 3(b), the control module 130 is configured to output the second driving signal to the second switching tube Q2 to control the voltage transforming condition of the second DC/DC converting circuit 122, and there is a mutual phase shift Ts1/n between driving sequences of the second driving signal output to the second voltage transforming unit 122A, where Ts1 represents a driving period of the second driving signal for inputting to the second switching tube Q2, n represents a driving sequence of the second voltage transforming unit 122A in each second DC/DC converting circuit 122, and n is a positive integer, that is, n =1,2,3 ….
When the ac/DC converter 100 having two three-phase input conversion modules 110 as shown in fig. 2, fig. 3(a) and fig. 3(B) provided in the embodiment of the present invention is in operation, a path of three-phase ac power is input into the first group of three-phase input conversion modules 110 through a port a1/B1/C1, filtered by a shunt filter circuit 111a to obtain a three-phase ac voltage/three-phase input voltage Vab1/Vbc1/Vca1, rectified by a rectifier circuit 112a to obtain a DC voltage Vrec1 containing 6 frequency doubling ripples, and converted into a DC bus voltage Vbus' containing 6 frequency doubling ripples through a first DC/DC conversion circuit 113 a; similarly, the other path of the three-phase alternating current is input into the second group of three-phase input conversion module 110 through a port a2/B2/C2, filtered by a shunt filter circuit 111B to obtain a three-phase alternating voltage/three-phase input voltage Vab2/Vbc2/Vca2, rectified by a rectifier circuit 112B to obtain a direct current voltage Vrec2 containing 6 frequency doubling ripples, and converted into a direct current bus voltage Vbus' containing 6 frequency doubling ripples through a first DC/DC conversion circuit 113B; vbus' output by the first DC/DC conversion circuit 113a and the first DC/DC conversion circuit 113b is input to the bus filter circuit 121 in parallel, and after filtering, a stable direct current voltage Vbus is output; the DC bus voltage Vbus is converted by the second DC/DC conversion circuit 122 to obtain a DC voltage Vo ', and the DC voltage Vo' is output through the output filter circuit 123. The converter divides the input into two paths of three-phase inputs and divides the input total current, thereby reducing the current requirement of each phase of fuse, selecting the specification of the common fuse and reducing the cost.
Example two
An embodiment of the present invention provides a power module, please refer to fig. 6, which shows a structure of a power module 10 provided in an embodiment of the present invention, where the power module 10 includes: the ac/dc converter 100 according to the first embodiment, the ac/dc converter 100 is the ac/dc converter 100 according to the first embodiment, and details thereof are omitted here.
In addition, in the embodiment of the present invention, the filter circuit in each three-phase input conversion module includes three input terminals with different phases, and the input terminals with the same phase of each filter circuit are connected in parallel through the copper bar. Specifically, the three-phase input ports of the three-phase input conversion modules are connected in parallel through the copper bars outside the ac/dc converter 100, please continue to refer to fig. 6, the a1 and a2 ports are short-circuited through the a-phase copper bars outside, and the B1 and B2 ports are short-circuited through the B-phase copper bars outside; the C1 and C2 ports are shorted externally by C-phase copper bars. When the external copper bars are short-circuited and connected in parallel, such as a certain phase line is absent or different phases are short-circuited together, the internal part of the alternating/direct current converter 100 can be identified by detecting the three-phase input voltage Vab1/Vbc1/Vca1 and/or the three-phase input voltage Vab2/Vbc2/Vca2 and the rectified voltage Vrec1 and/or Vrec2, so that the circuit is prevented from being damaged.
It should be noted that, in order to clearly show the connection relationship between the ac/dc converter 100 and each three-phase input conversion module, in the example shown in fig. 6, taking the case that there are two three-phase input conversion modules 110, and the two three-phase input conversion modules 110 are connected in parallel by copper bars, two sets of input ports a1, B1, C1, and a2, B2, C2 of the three-phase input conversion modules correspond to two sets of input ports of the two sets of three-phase input conversion modules 110 in fig. 2, fig. 3(a), and fig. 3(B), and the same letter represents the same port. In other embodiments, the number of the three-phase input conversion modules may be set according to actual needs, and the connection mode and the connection medium between the three-phase input conversion modules may be other than the case where the copper bars are arranged in parallel, and need not be limited by the embodiments of the present invention.
EXAMPLE III
An embodiment of the present invention provides a method for detecting a fault of a power module, where the method for detecting a fault may be applied to the power module described in the second embodiment, please refer to fig. 7, which shows a flow of the method for detecting a fault of a power module provided in the embodiment of the present invention, where the method includes, but is not limited to, the following steps:
step S10: collecting rectified voltages output by rectifying circuits in three-phase input conversion modules in the alternating current/direct current converter;
in the embodiment of the present invention, please refer to the first embodiment, when the fault detection is needed, it can be determined whether a fault occurs by detecting the voltage at the output terminal of each rectifying circuit in the ac/dc converter. For example, in the examples shown in fig. 2, 3(a) and 3(b), the dc voltage Vrec1 output by the rectifier circuit 112a is collected, and the dc voltage Vrec2 output by the rectifier circuit 112b is collected.
Step S20: the collected values of the rectified voltages are subtracted in pairs to obtain difference values, and whether the difference values are within a preset voltage difference range is judged; if not, jumping to step S30;
after the rectified voltages output by the rectifying circuits in the three-phase input conversion modules are obtained, the acquired numerical values of the rectified voltages are subtracted pairwise to obtain difference values, whether the difference values are within a preset range is judged, and whether a fault occurs is determined. For example, when three-phase input conversion modules exist and three rectified voltages U1/U2/U3 can be acquired, the two-two difference includes three conditions of U1-U2, U1-U3 and U2-U3, and the judgment principle of power modules with other numbers of three-phase input conversion modules is the same. As an example, fig. 2, fig. 3(a) and fig. 3(b) are used, and after the dc voltage Vrec1 and the dc voltage Vrec2 are collected, the difference Vrec1-Vrec2, Vrec2-Vrec1, or | Vrec1-Vrec2| between the dc voltage Vrec1 and the dc voltage Vrec2 is calculated, and whether the difference is within the preset range is determined, so as to determine whether a fault occurs.
Step S30: determining that there is a fault in the connection of the AC/DC converter to the three-phase AC power source.
In the embodiment of the present invention, as described above, when it is determined that the difference is not within the preset voltage difference range, it may be determined that at least one group of the two three-phase input conversion modules used for calculation is necessarily connected to the three-phase ac power source, and a fault exists.
In some embodiments, please refer to fig. 8, which shows a flow of another method for detecting a fault of a power module according to an embodiment of the present invention, where the method further includes:
step S40: collecting three-phase input voltage input by the input end of each filter circuit in the alternating current/direct current converter;
step S50: and determining the specific fault condition existing between the three-phase alternating current power supply and each three-phase input conversion module according to the deviation condition of the difference value and the preset voltage difference range and/or the three-phase input voltage.
In the embodiment of the present invention, after it is determined that there is a fault in the connection between the ac/dc converter and the three-phase ac power supply, further, the values of the two rectified voltages may be compared with the rectified voltages collected from other normally-connected three-phase input conversion modules to determine a specific fault condition, or further, the three-phase input voltages entering each three-phase input conversion module may be collected to determine a specific fault condition, where the specific fault condition at least includes information of a fault port.
Specifically, the specific fault condition may be determined by comparing the specific value of the voltage, or comparing the waveform diagram, and the like, and may be specifically selected according to the actual need, and various specific fault conditions are determined by comparing the waveform diagram with the structure shown in fig. 6 as follows:
referring to fig. 9(a) and 9(b), fig. 9(a) shows a state where the power module shown in fig. 6 is connected without failure, fig. 9(b) shows waveforms of the dc voltage Vrec1 and the dc voltage Vrec2, the three-phase input voltage Vab1/Vbc1/Vca1, and the three-phase input voltage Vab2/Vbc2/Vca2 in the connected state shown in fig. 9(a), when the power module is normally connected, the voltages of the dc voltage Vrec1 and the dc voltage Vrec2 are almost coincident with each other, and the deviation is very small.
Referring to fig. 10(a) and fig. 10(b), where fig. 10(a) is a state where a disconnection fault occurs between the ports of the a-phase copper bar and the a2 in the power module shown in fig. 6, and fig. 10(b) is a waveform diagram of the dc voltage Vrec1 and the dc voltage Vrec2, the three-phase input voltage Vab1/Vbc1/Vca1, and the three-phase input voltage Vab2/Vbc2/Vca2 in the connection state shown in fig. 10(a), when the disconnection fault occurs, the voltages of the dc voltage Vrec1 and the dc voltage Vrec2 are greatly different, and the waveforms of the three-phase input voltages Vab2 and Vca2 collected at this time are obviously abnormal, and the fault can be identified by detecting a voltage difference between the dc voltage Vrec1 and the dc voltage 2, and it can be determined that the ac input port is abnormal. Or, the waveforms and voltage values of the three-phase input voltages Vab2 and Vca2 collected at this time are obviously abnormal, and it is determined that the ac input port is abnormal through the values.
Fig. 11(a) and 11(B) are waveform diagrams of the dc voltage and the three-phase input voltage output by the rectifier circuit in the state where the B-phase copper bar and the B2 port are disconnected and failed and in the connected state in the power module shown in fig. 6, similarly to fig. 10(a) and 10 (B); fig. 12(a) and 12(b) are waveform diagrams of the dc voltage and the three-phase input voltage output by the rectifier circuit in the state where the connection between the C-phase copper bar and the C2 port is broken in the power module shown in fig. 6, and in the connected state, similarly to fig. 10(a) and 10 (b); similarly, when the a1/B1/C1 port has a single-phase disconnection fault, the situation is similar to the situation in fig. 10(B), fig. 11(B), and fig. 12(B), and details are not repeated here.
Referring to fig. 13(a) and fig. 13(B), fig. 13(a) shows a state where a short-circuit connection fault occurs in the ac input between two three-phase input conversion modules in the power module shown in fig. 6, and fig. 13(a) shows an example of a short circuit between the a-phase and the B-phase, fig. 13(B) shows waveforms of the dc voltage Vrec1 and the dc voltage Vrec2, the three-phase input voltages Vab1/Vbc1/Vca1, and the three-phase input voltages Vab2/Vbc2/Vca2 in the connection state shown in fig. 14(a), and it can be seen that voltages of the dc voltage Vrec1 and the dc voltage Vrec2 after the fault are greatly different, and the fault can be identified by detecting a voltage difference between the dc voltage Vrec1 and the dc voltage Vrec2, and it can be determined that the ac input port has an abnormality. Or, the waveforms and voltage values of the three-phase input voltages Vab1 and Vab2 collected at this time are obviously abnormal, and it is determined that the ac input port is abnormal through the values. The connection condition of the state of the fault of short-circuit connection error of the alternating current input between other similar three-phase input conversion modules is the same, and the description is omitted here.
Referring to fig. 14(a) and fig. 14(b), fig. 14(a) shows a fault state in which a connection failure occurs in a single phase in the power module shown in fig. 6, and fig. 14(a) shows an example in which a connection failure occurs in a port a1, fig. 14(b) shows waveforms of a dc voltage Vrec1 and a dc voltage Vrec2, a three-phase input voltage Vab1/Vbc1/Vca1, and a three-phase input voltage Vab2/Vbc2/Vca2 in the connection state shown in fig. 14(a), and when a connection failure occurs in a certain phase and a contact resistance increases, the voltage deviation between the dc voltage Vrec1 and the dc voltage Vrec2 after the fault occurs, and the fault can be identified by detecting a voltage difference between the dc voltage Vrec1 and the dc voltage Vrec 2. Other similar connection conditions of the fault state of poor connection of the single phase occur, and the description is omitted here.
In summary, no matter a single-phase disconnection fault occurs in the external connection, a short-circuit connection fault occurs, or a fault occurs in one external connection, an abnormality can be identified by detecting a voltage difference between the dc voltage Vrec1 and the dc voltage Vrec2, that is, a voltage difference between rectified voltages output by the rectifying circuits in the two three-phase input modules, so as to protect the converter.
The embodiment of the invention provides an alternating current/direct current converter, a power supply module and a fault detection method thereof, wherein the converter comprises at least two three-phase input conversion modules, a direct current output module and a control module, each three-phase input conversion module comprises a shunt filter circuit, a rectifying circuit and a first DC/DC conversion circuit which are sequentially connected, the input end of the shunt filter circuit is connected with a three-phase alternating current power supply, and the output end of the first DC/DC conversion circuit is connected with the direct current output module And if the connection of the three-phase alternating current power supply fails, the self-checking of the fault of the power supply module is realized.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. Those skilled in the art will appreciate that all or part of the processes in the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, where the computer program can be stored in a computer-readable storage medium, and when executed, the computer program can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. An ac/dc converter, comprising: at least two three-phase input conversion modules, a direct current output module and a control module,
each three-phase input conversion module comprises a shunt filter circuit, a rectifying circuit and a first DC/DC conversion circuit which are connected in sequence, the input end of the shunt filter circuit is connected with a three-phase alternating current power supply, the output end of the first DC/DC conversion circuit is connected with the direct current output module,
the detection end of the control module is respectively connected with the output end of the rectifying circuit in each three-phase input conversion module to collect rectified voltage, and the control module is configured to judge whether the connection of the alternating current/direct current converter and the three-phase alternating current power supply fails according to the rectified voltage.
2. The AC/DC converter according to claim 1,
the detection end of the control module is further respectively connected with the input end of the shunt filter circuit in each three-phase input conversion module to collect three-phase input voltage, and the control module is further configured to determine specific fault conditions according to the three-phase input voltage and the rectified voltage.
3. The AC/DC converter according to claim 2,
the direct current output module comprises a bus filter circuit, a second DC/DC conversion circuit and an output filter circuit which are sequentially connected, the input end of the bus filter circuit is respectively connected with the output end of the first DC/DC conversion circuit in each three-phase input conversion module, and the output end of the output filter circuit is used for outputting direct current.
4. The ac/dc converter of claim 3, wherein the bus filter circuit comprises:
a first diode, the cathode of which is respectively connected with the anode output end of the first DC/DC conversion circuit in each three-phase input conversion module;
one end of the first filter capacitor is connected with the anode of the first diode, and the other end of the first filter capacitor is respectively connected with the cathode output end of the first DC/DC conversion circuit in each three-phase input conversion module;
a pre-charge resistor connected in parallel with the first diode;
a pre-charge relay connected in parallel with the first diode.
5. The AC/DC converter according to any one of claims 1 to 4,
the shunt filter circuit comprises three filter units with the same structure respectively connected with three-phase outputs of the three-phase alternating current power supply,
each filtering unit comprises a first fuse and a first inductor which are connected in series, and the first fuse is connected to each phase output of the three-phase alternating current power supply.
6. The AC/DC converter according to any one of claims 1-4,
the rectification circuit is a three-phase uncontrolled rectifier bridge consisting of diodes, the rectification circuit comprises three groups of diode groups connected in parallel, each diode group comprises two diodes connected in series,
in the single three-phase input conversion module, three output ends of the shunt filter circuit are correspondingly connected with three groups of diodes in the rectifying circuit and are connected between two diodes which are connected in series.
7. The AC/DC converter according to any one of claims 1-4,
the first DC/DC conversion circuit comprises a plurality of first transformation units which are arranged in parallel, and each first transformation unit comprises:
the second filter capacitor is connected between the positive and negative output ends of the shunt filter circuit in parallel;
one end of the second fuse is connected with one end of the second filter capacitor;
one end of the second inductor is connected with the other end of the second fuse;
the anode of the second diode is connected with the other end of the second inductor, and the cathode of the second diode is connected with the anode input end of the direct current output module;
and one end of the first switch tube is connected between the other end of the second inductor and the anode of the second diode, and the other end of the first switch tube is connected with the other end of the second filter capacitor and the negative input end of the direct current output module.
8. The AC/DC converter according to claim 7,
the control module is configured to output a first driving signal to the first switch tube to control the transformation condition of the first DC/DC conversion circuit, and has,
the driving sequences of the first driving signals output to the single first voltage transformation unit are mutually staggered in phase Ts/n,
the driving sequences of the first driving signals output to the first voltage transformation units in two adjacent first DC/DC conversion circuits are mutually staggered by 0.5Ts/n,
wherein Ts denotes a driving period of the first driving signal, n denotes a driving sequence of the first transforming unit in each of the first DC/DC converting circuits, and n is a positive integer.
9. The AC/DC converter according to claim 3 or 4,
the second DC/DC conversion circuit comprises a plurality of second transformation units which are arranged in parallel, and the second transformation units comprise:
the third filter capacitor is connected between the positive and negative output ends of the bus filter circuit in parallel;
a third diode, a cathode of which is connected with one end of the third filter capacitor;
one end of the second switch tube is connected with the other end of the third filter capacitor, and the other end of the second switch tube is connected with the anode of the third diode;
one end of the third fuse is connected between the other end of the second switch tube and the anode of the third diode;
one end of the third inductor is connected with the other end of the third fuse;
and one end of the fourth filter capacitor is connected between the positive electrode output end of the bus filter circuit and the positive electrode input end of the output filter circuit, and the other end of the fourth filter capacitor is connected between the other end of the third inductor and the negative electrode input end of the output filter circuit.
10. The AC/DC converter according to claim 9,
the control module is configured to output a second driving signal to the second switching tube to control the transformation of the second DC/DC conversion circuit, and has,
the driving sequences of the second driving signals output to the second voltage transformation unit are mutually staggered by Ts1/n, wherein,
ts1 denotes a drive cycle of the second drive signal, n denotes a drive sequence of the second voltage transforming unit in each of the second DC/DC converting circuits, and n is a positive integer.
11. A power supply module comprising an ac/dc converter according to any one of claims 1 to 10.
12. A method for detecting a fault of a power module, which is applied to the power module as claimed in claim 11, the method comprising:
collecting rectified voltage output by a rectifying circuit in each three-phase input conversion module in the alternating current/direct current converter;
the collected values of the rectified voltages are subtracted in pairs to obtain difference values, and whether the difference values are within a preset voltage difference range is judged;
and if not, determining that the connection between the alternating current/direct current converter and the three-phase alternating current power supply has a fault.
13. The fault detection method of claim 12, wherein the method further comprises:
collecting three-phase input voltage input by the input end of each filter circuit in the alternating current/direct current converter;
and determining the specific fault condition existing between the three-phase alternating current power supply and each three-phase input conversion module according to the deviation condition of the difference value and the preset voltage difference range and/or the three-phase input voltage.
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