CN113740644A - Current converter testing method and current converter - Google Patents
Current converter testing method and current converter Download PDFInfo
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- CN113740644A CN113740644A CN202110994877.7A CN202110994877A CN113740644A CN 113740644 A CN113740644 A CN 113740644A CN 202110994877 A CN202110994877 A CN 202110994877A CN 113740644 A CN113740644 A CN 113740644A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a current converter testing method and a current converter. The converter comprises a half-bridge circuit and a bypass circuit, wherein the half-bridge circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit and the second bridge arm circuit are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit is connected with the first bridge arm circuit in parallel; the converter testing method comprises the following steps: controlling the first bridge arm circuit to be conducted; controlling the second bridge arm circuit to be conducted; and detecting the current of the half-bridge circuit, and determining whether the through protection of the current converter meets the passing condition or not according to the current. The invention achieves the effect of testing the effectiveness of the protective measures when the half-bridge circuit of the converter has the straight-through fault.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a current converter testing method and a current converter.
Background
The flexible direct current converter is widely applied to an electric power system, but a problem that a bridge arm circuit of a half-bridge circuit is triggered by mistake to cause a through fault may exist in the operation process of the half-bridge circuit of the flexible direct current converter, so that the effectiveness of protective measures when the through fault occurs in the half-bridge circuit of the converter needs to be tested.
Disclosure of Invention
The invention provides a converter testing method and a converter, which are used for testing the effectiveness of protective measures when a half-bridge circuit of the converter has a through fault.
In a first aspect, an embodiment of the present invention provides a converter testing method, where the converter includes a half-bridge circuit and a bypass circuit, the half-bridge circuit includes a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit and the second bridge arm circuit are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit is connected in parallel with the first bridge arm circuit; the converter testing method comprises the following steps:
controlling the first bridge arm circuit to be conducted;
controlling the second bridge arm circuit to be conducted;
and detecting the current of the half-bridge circuit, and determining whether the through protection of the converter meets a passing condition according to the current.
Optionally, the bypass circuit comprises a bypass switch, the bypass switch being connected in parallel with the first leg circuit;
after controlling the first bridge arm circuit to be conducted, the method further comprises the following steps:
and controlling the bypass switch to be closed, and controlling the first bridge arm circuit to be switched off.
Optionally, the converter further comprises a control module and a driving module;
detecting a current of the half-bridge circuit, and determining whether a pass condition is satisfied by a shoot-through protection of the converter according to the current comprises:
the driving module controls the second bridge arm circuit to be turned off;
the control module detects the current of the half-bridge circuit, and when the current of the half-bridge circuit is zero, the through protection of the current converter is determined to meet the passing condition.
Optionally, detecting a current of the half-bridge circuit, and determining whether a pass condition is satisfied by the through protection of the converter according to the current comprises:
detecting the current of the half-bridge circuit;
and when the current of the half-bridge circuit meets the preset current, determining that the through protection of the current converter meets the passing condition.
Optionally, detecting the current of the half-bridge circuit comprises:
and when the conduction time of the second bridge arm circuit is greater than or equal to the preset time, detecting the current of the half-bridge circuit.
Optionally, before controlling the first bridge arm circuit to be turned on, the method further includes:
and charging the voltage of the capacitor of the half-bridge circuit to a preset voltage.
In a second aspect, an embodiment of the present invention further provides a converter, where the converter includes a half-bridge circuit, a bypass circuit, and a control module;
the half-bridge circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit and the second bridge arm circuit are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit is connected with the first bridge arm circuit in parallel; the first bridge arm circuit is connected with the second bridge arm circuit in series;
the control end of the first bridge arm circuit is connected with the control module, and the control module is used for controlling the first bridge arm circuit to be conducted;
the control end of the second bridge arm circuit is connected with the control module, and the control module is further used for controlling the second bridge arm circuit to be conducted;
the control module is further used for detecting the current of the half-bridge circuit and determining whether the through protection of the converter meets the passing condition according to the current.
Optionally, the bypass circuit comprises a bypass switch, the bypass switch being connected in parallel with the first leg circuit;
and the control end of the bypass switch is connected with the control module, and the control module is also used for controlling the bypass switch to be closed and the first bridge arm circuit to be switched off after the first bridge arm circuit is switched on.
Optionally, the converter further comprises a drive module;
the control module is connected with the control end of the second bridge arm circuit through the driving module, and the driving module is used for controlling the second bridge arm circuit to be switched off when the first bridge arm circuit is switched on and the second bridge arm circuit is switched on;
the control module is used for detecting the current of the half-bridge circuit, and when the current of the half-bridge circuit is zero, the through protection of the current converter is determined to meet the passing condition.
Optionally, the control module is further configured to detect a current of the half-bridge circuit when the first bridge arm circuit is turned on and the second bridge arm circuit is turned on, and determine that a pass-through protection of the converter meets a pass condition when the current of the half-bridge circuit meets a preset current.
According to the invention, the first bridge arm circuit is controlled to be conducted, and then the second bridge arm circuit is controlled to be conducted after the first bridge arm circuit is conducted, so that the working condition of the half-bridge circuit with the through fault is simulated, then the current of the half-bridge circuit is detected, and whether the through protection of the converter meets the passing condition or not is judged according to the detected current, thereby realizing the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter. The invention achieves the effect of testing the effectiveness of the protective measures when the half-bridge circuit of the converter has the straight-through fault.
Drawings
Fig. 1 is a flowchart of a converter testing method according to an embodiment of the present invention;
fig. 2 is a flowchart of another converter testing method according to an embodiment of the present invention;
fig. 3 is a flowchart of another converter testing method according to an embodiment of the present invention;
fig. 4 is a flowchart of another converter testing method according to an embodiment of the present invention;
fig. 5 is a flowchart of another converter testing method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a converter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another converter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a converter testing method according to an embodiment of the present invention, where the present embodiment is applicable to a converter testing situation, fig. 6 is a schematic structural diagram of a converter according to an embodiment of the present invention, and referring to fig. 6, the converter includes a half-bridge circuit 610 and a bypass circuit 620, the half-bridge circuit 610 includes a first bridge arm circuit 611 and a second bridge arm circuit 612, the first bridge arm circuit 611 and the second bridge arm circuit 612 are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit 620 is connected in parallel with the first bridge arm circuit 611; referring to fig. 1, the converter testing method specifically includes the following steps:
and S110, controlling the first bridge arm circuit to be conducted.
Specifically, referring to fig. 6, the first bridge arm circuit 611 is, for example, a lower bridge arm circuit, the first bridge arm circuit 611 includes an N-type transistor, the second bridge arm circuit 612 is, for example, an upper bridge arm circuit, the second bridge arm circuit 612 includes an N-type transistor, a first end of the second bridge arm circuit 612 is connected to a positive terminal of the ac power supply 10, a control terminal of the second bridge arm circuit 612 is connected to the control module 630, a second end of the second bridge arm circuit 612 is connected to the first end of the first bridge arm circuit 611, a control terminal of the first bridge arm circuit 611 is connected to the control module 630, a second end of the first bridge arm circuit 611 is connected to a negative terminal of the ac power supply 10, and the half-bridge circuit 610 can convert an ac signal of the ac power supply 10 into a dc signal and output the dc signal. The bypass circuit 620 is connected in parallel with the first leg circuit 611, and can be switched to the bypass circuit 620 when the half bridge circuit 610 fails, so that the bypass circuit 620 operates. First, the control module 630 controls the first leg circuit 611 to be turned on, and the half-bridge circuit 610 works normally.
And S120, controlling the second bridge arm circuit to be conducted.
Specifically, after the first bridge arm circuit 611 is turned on, the control module 630 controls the second bridge arm circuit 612 to be turned on, the first bridge arm circuit 611 and the second bridge arm circuit 612 are simultaneously turned on, and the half-bridge circuit 610 has a through fault.
And S130, detecting the current of the half-bridge circuit, and determining whether the through protection of the current converter meets the passing condition or not according to the current.
Specifically, when the half-bridge circuit 610 has a through fault, a through protection measure may be taken, for example, to control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned off, so that the current of the half-bridge circuit 610 is zero, and at this time, the current of the half-bridge circuit 610 is detected, and if the detected current is zero, it indicates that the through protection of the inverter satisfies the pass condition, and the test of the inverter passes. Or the through protection measure of the half-bridge circuit 610 does not control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned off, but the current of the half-bridge circuit 610 should meet the preset current, so that it can be ensured that other devices are not affected or damaged when the through fault occurs in the half-bridge circuit 610, and the half-bridge circuit 610 can still flow through for a long time, so that the current of the half-bridge circuit 610 is detected, and if the detected current meets the preset current, the through protection of the inverter meets the passing condition, and the test of the inverter passes. Therefore, whether the through protection of the converter meets the passing condition or not can be determined by detecting the current of the half-bridge circuit 610, and the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter is tested.
According to the technical scheme of the embodiment, the first bridge arm circuit is controlled to be conducted, the second bridge arm circuit is controlled to be conducted after the first bridge arm circuit is conducted, the working condition that the half-bridge circuit has the through fault is simulated, then the current of the half-bridge circuit is detected, whether the through protection of the converter meets the passing condition or not is judged according to the detected current, and therefore the effectiveness of protection measures when the through fault occurs in the half-bridge circuit of the converter is tested. The technical scheme of the embodiment achieves the effect of testing the effectiveness of the protective measures when the through fault occurs in the half-bridge circuit of the converter.
On the basis of the above embodiment, fig. 2 is a flowchart of another converter testing method provided by an embodiment of the present invention, and fig. 7 is a schematic structural diagram of another converter provided by an embodiment of the present invention, and optionally, referring to fig. 7, the bypass circuit 620 includes a bypass switch 621, and the bypass switch 621 is connected in parallel with the first bridge arm circuit 611; optionally, referring to fig. 2, the converter testing method specifically includes the following steps:
and S210, controlling the first bridge arm circuit to be conducted.
And S220, controlling the bypass switch to be closed and controlling the first bridge arm circuit to be switched off.
Specifically, after the first bridge arm circuit 611 is turned on, the bypass switch 621 is controlled to be turned on, and the first bridge arm circuit 611 is controlled to be turned off, so that the operation condition of the bypass circuit 620 of the converter can be simulated.
And S230, controlling the second bridge arm circuit to be conducted.
Specifically, after the first bridge arm circuit 611 is turned on, the bypass switch 621 is closed, and after the first bridge arm circuit 611 is turned off, the second bridge arm circuit 612 is controlled to be turned on, so that normal operation of the bypass circuit 620 of the converter can be simulated, and the condition that the second bridge arm circuit 612 is turned on by mistake, that is, the condition that the second bridge arm circuit 612 is turned on by mistake after the bypass switch 621 is turned on is simulated, and the second bridge arm circuit 612 has a through fault.
And S240, detecting the current of the half-bridge circuit, and determining whether the through protection of the current converter meets the passing condition or not according to the current.
Specifically, after second bridge arm circuit 612 has a through fault, second bridge arm circuit 612 takes through protection measures, for example, second bridge arm circuit 612 is controlled to be turned off, so that the current of half-bridge circuit 610 is zero, the current of half-bridge circuit 610 is detected, and if the detected current is zero, it indicates that the through protection of second bridge arm circuit 612 meets the passing condition, and the test of the inverter passes. Or the through protection measures of the second bridge arm circuit 612 do not control the second bridge arm circuit 612 to be turned off, but the current of the half-bridge circuit 610 should meet the preset current, so that it can be ensured that other equipment is not affected or damaged when the second bridge arm circuit 612 has a through fault, and the second bridge arm circuit 612 can still have a long-term through current, so that the current of the half-bridge circuit 610 is detected, and if the detected current meets the preset current, the through protection of the converter meets the passing condition, and the test of the converter passes. Therefore, whether the through protection of the converter meets the passing condition or not can be determined by detecting the current of the half-bridge circuit 610, so that the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter is tested when the bypass switch is closed and the second bridge arm circuit is conducted by mistake.
On the basis of the above embodiment, this embodiment is a further refinement of S240 in the above embodiment, fig. 3 is a flowchart of another converter testing method provided in an embodiment of the present invention, and optionally, referring to fig. 7, the converter further includes a control module 630 and a driving module 640; optionally, referring to fig. 3, the converter testing method specifically includes the following steps:
and S310, controlling the first bridge arm circuit to be conducted.
And S320, controlling the bypass switch to be closed and controlling the first bridge arm circuit to be switched off.
And S330, controlling the second bridge arm circuit to be conducted.
And S340, controlling the second bridge arm circuit to be turned off by the driving module.
Specifically, control module 630 is connected to a control end of second bridge arm circuit 612 through a driving module 640, driving module 640 has a through protection function, and when second bridge arm circuit 612 has a through fault, driving module 640 takes through protection measures to control second bridge arm circuit 612 to turn off.
And S350, detecting the current of the half-bridge circuit by the control module, and determining that the through protection of the current converter meets the passing condition when the current of the half-bridge circuit is zero.
Specifically, after the driving module 640 controls the second bridge arm circuit 612 to be turned off, the control module 630 detects the current of the half-bridge circuit 610, and when the current of the half-bridge circuit 610 is zero, it indicates that the driving module 640 controls the second bridge arm circuit 612 to be turned off completely, that is, it can be determined that the through protection of the inverter meets the passing condition.
On the basis of the above embodiment, this embodiment is further detailed on S240 in the above embodiment, fig. 4 is a flowchart of another converter testing method provided in an embodiment of the present invention, and optionally, referring to fig. 4, the converter testing method specifically includes the following steps:
and S410, controlling the first bridge arm circuit to be conducted.
And S420, controlling the bypass switch to be closed and controlling the first bridge arm circuit to be switched off.
And S430, controlling the second bridge arm circuit to be conducted.
And S440, detecting the current of the half-bridge circuit.
Specifically, after bypass switch 621 is turned on and second bridge arm circuit 612 is turned on, second bridge arm circuit 612 has a through fault, but at this time, control module 630 controls the through protection function of driving module 640 to be turned off, so that driving module 640 cannot turn off second bridge arm circuit 612. With bypass switch 621 closed and second leg circuit 612 conductive, control module 630 directly senses the current of half-bridge circuit 610.
And S450, when the current of the half-bridge circuit meets the preset current, determining that the through protection of the current converter meets the passing condition.
Specifically, if the current of the half-bridge circuit 610 satisfies the preset current, that is, the current passing through the second bridge arm circuit 612 satisfies the preset current, the second bridge arm circuit 612 will not affect or damage other devices when a through fault occurs, so that it can be determined that the through protection of the converter satisfies the passing condition. Alternatively, the current of the bypass circuit 620 may be detected, and whether the through protection of the inverter satisfies the passing condition may be determined according to the current of the bypass circuit 620.
Based on the above technical solution, S440, detecting the current of the half-bridge circuit includes:
and when the conduction time of the second bridge arm circuit is greater than or equal to the preset time, detecting the current of the half-bridge circuit.
Specifically, when the conduction time of the second bridge arm circuit 612 is greater than or equal to the preset time, the current of the half-bridge circuit 610 is detected, so that a more accurate and stable current can be obtained, the accuracy of judging whether the through protection of the converter is effective can be improved, and the second bridge arm circuit 612 cannot pass through for a long time when the through fault occurs. The preset time is, for example, 2 hours, or other times, and may be determined according to actual conditions, which is not limited herein.
On the basis of the foregoing embodiment, fig. 5 is a flowchart of another converter testing method provided in an embodiment of the present invention, and optionally, referring to fig. 5, the converter testing method specifically includes the following steps:
and S510, charging the voltage of the capacitor of the half-bridge circuit to a preset voltage.
Specifically, the preset voltage is, for example, the highest voltage value of the half-bridge circuit 610 during stable operation of the inverter in the actual operation process, and the capacitor of the half-bridge circuit 610 is first charged to the preset voltage, so that the capacitor can be directly discharged when the second bridge arm circuit 612 has a direct fault.
And S520, controlling the first bridge arm circuit to be conducted.
And S530, controlling the second bridge arm circuit to be conducted.
And S540, detecting the current of the half-bridge circuit, and determining whether the through protection of the current converter meets the passing condition or not according to the current.
Fig. 6 is a schematic structural diagram of a converter according to an embodiment of the present invention, and referring to fig. 6, the converter includes a half-bridge circuit 610, a bypass circuit 620, and a control module 630; the half-bridge circuit 610 includes a first bridge arm circuit 611 and a second bridge arm circuit 612, the first bridge arm circuit 611 and the second bridge arm circuit 612 are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit 620 is connected in parallel with the first bridge arm circuit 611; first leg circuit 611 is connected in series with second leg circuit 612; the control end of the first bridge arm circuit 611 is connected with the control module 630, and the control module 630 is used for controlling the first bridge arm circuit 611 to be conducted; the control end of the second bridge arm circuit 612 is connected to the control module 630, and the control module 630 is further configured to control the second bridge arm circuit 612 to be turned on after the first bridge arm circuit 611 is turned on; the control module 630 is further configured to detect a current of the half-bridge circuit 610, and determine whether the through-protection of the inverter satisfies a passing condition according to the current.
Specifically, the first bridge arm circuit 611 is, for example, a lower bridge arm circuit, the first bridge arm circuit 611 includes N-type transistors, the second bridge arm circuit 612 is, for example, an upper bridge arm circuit, and the second bridge arm circuit 612 includes N-type transistors. First, the control module 630 controls the first leg circuit 611 to be turned on, and the half-bridge circuit 610 works normally. After the first bridge arm circuit 611 is turned on, the control module 630 controls the second bridge arm circuit 612 to be turned on, the first bridge arm circuit 611 and the second bridge arm circuit 612 are simultaneously turned on, and the half bridge circuit 610 has a through fault. When the half-bridge circuit 610 has a through fault, a through protection measure may be taken, for example, to control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned off, so that the current of the half-bridge circuit 610 is zero, at this time, the current of the half-bridge circuit 610 is detected, and if the detected current is zero, it indicates that the through protection of the inverter meets the pass condition, and the test of the inverter passes. Or the through protection measure of the half-bridge circuit 610 does not control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned off, but the current of the half-bridge circuit 610 should meet the preset current, so that it can be ensured that other devices are not affected or damaged when the through fault occurs in the half-bridge circuit 610, and the half-bridge circuit 610 can still flow through for a long time, so that the current of the half-bridge circuit 610 is detected, and if the detected current meets the preset current, the through protection of the inverter meets the passing condition, and the test of the inverter passes. Therefore, whether the through protection of the converter meets the passing condition or not can be determined by detecting the current of the half-bridge circuit 610, and the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter is tested.
Fig. 7 is a schematic structural diagram of another converter provided in the embodiment of the present invention, and optionally, referring to fig. 7, the bypass circuit 620 includes a bypass switch 621, and the bypass switch 621 is connected in parallel to the first leg circuit 611; the control end of the bypass switch 621 is connected to the control module 630, and the control module 630 is further configured to control the bypass switch 621 to be closed and control the first bridge arm circuit 611 to be turned off after the first bridge arm circuit 611 is turned on.
Specifically, after the first bridge arm circuit 611 is turned on, the bypass switch 621 is controlled to be turned on, and the first bridge arm circuit 611 is controlled to be turned off, so that the operation condition of the bypass circuit 620 of the converter can be simulated. After the first bridge arm circuit 611 is turned on, the bypass switch 621 is closed, and after the first bridge arm circuit 611 is turned off, the second bridge arm circuit 612 is controlled to be turned on, so that the normal operation of the bypass circuit 620 of the converter can be simulated, and the condition that the second bridge arm circuit 612 is turned on by mistake, that is, the condition that the second bridge arm circuit 612 is turned on by mistake after the bypass switch 621 is closed is simulated, and the second bridge arm circuit 612 has a direct fault. After the second bridge arm circuit 612 has a through fault, the second bridge arm circuit 612 takes through protection measures, for example, controls the second bridge arm circuit 612 to be turned off, so that the current of the half-bridge circuit 610 is zero, at this time, the current of the half-bridge circuit 610 is detected, and if the detected current is zero, it indicates that the through protection of the second bridge arm circuit 612 meets the passing condition, and the test of the inverter passes. Or the through protection measures of the second bridge arm circuit 612 do not control the second bridge arm circuit 612 to be turned off, but the current of the half-bridge circuit 610 should meet the preset current, so that it can be ensured that other equipment is not affected or damaged when the second bridge arm circuit 612 has a through fault, and the second bridge arm circuit 612 can still have a long-term through current, so that the current of the half-bridge circuit 610 is detected, and if the detected current meets the preset current, the through protection of the converter meets the passing condition, and the test of the converter passes. Therefore, whether the through protection of the converter meets the passing condition or not can be determined by detecting the current of the half-bridge circuit 610, and the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter is tested.
Optionally, referring to fig. 7, the converter further includes a driving module 640; the control module 630 is connected to the control end of the second bridge arm circuit 612 through a driving module 640, and the driving module 640 is configured to control the second bridge arm circuit 612 to be turned off when the first bridge arm circuit 611 is turned on and the second bridge arm circuit 612 is turned on; the control module 630 is configured to detect a current of the half-bridge circuit 610, and determine that the through protection of the inverter satisfies a passing condition when the current of the half-bridge circuit 610 is zero. Optionally, control module 630 is connected to the control terminal of first leg circuit 611 through driving module 640. The driving module 640 may convert the control signal sent by the control module 630 into a driving signal, and send the driving signal to the control ends of the first bridge arm circuit 611 and the second bridge arm circuit 612, so as to control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned on and off.
Specifically, the first bridge arm circuit 611 and the second bridge arm circuit 612 are simultaneously turned on, the half-bridge circuit 610 has a through fault, a through protection measure is taken, the first bridge arm circuit 611 and the second bridge arm circuit 612 are controlled to be turned off, the current of the half-bridge circuit 610 is enabled to be zero, the current of the half-bridge circuit 610 is detected, if the detected current is zero, it is indicated that the through protection of the converter meets the passing condition, and the test of the converter passes.
Optionally, referring to fig. 7, the control module 630 is further configured to detect a current of the half-bridge circuit 610 when the first bridge arm circuit 611 is turned on and the second bridge arm circuit 612 is turned on, and determine that the through protection of the inverter satisfies the passing condition when the current of the half-bridge circuit 610 satisfies a preset current.
Specifically, the first bridge arm circuit 611 and the second bridge arm circuit 612 are simultaneously turned on, the half-bridge circuit 610 has a through fault, the through protection measure of the half-bridge circuit 610 does not control the first bridge arm circuit 611 and the second bridge arm circuit 612 to be turned off, but the current of the half-bridge circuit 610 should meet a preset current, so that it can be ensured that other equipment is not affected or damaged when the half-bridge circuit 610 has the through fault, and the half-bridge circuit 610 can still have a through current for a long time, so that the current of the half-bridge circuit 610 is detected, if the detected current meets the preset current, the through protection of the converter meets a pass condition, and the test of the converter passes. Therefore, whether the through protection of the converter meets the passing condition or not can be determined by detecting the current of the half-bridge circuit 610, and the effectiveness of the protection measures when the through fault occurs in the half-bridge circuit of the converter is tested.
Optionally, referring to fig. 7, half bridge circuit 610 includes a capacitor C1, a first terminal of capacitor C1 is connected to a first terminal of second leg circuit 612, and a second terminal of capacitor C1 is connected to a second terminal of first leg circuit 611.
Optionally, referring to fig. 7, the half-bridge circuit 610 further includes a resistor R1, and the resistor R1 is connected in parallel with the capacitor C1.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A converter testing method is characterized in that the converter comprises a half-bridge circuit and a bypass circuit, the half-bridge circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit and the second bridge arm circuit are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit is connected with the first bridge arm circuit in parallel; the converter testing method comprises the following steps:
controlling the first bridge arm circuit to be conducted;
controlling the second bridge arm circuit to be conducted;
and detecting the current of the half-bridge circuit, and determining whether the through protection of the converter meets a passing condition according to the current.
2. The converter testing method according to claim 1, wherein the bypass circuit comprises a bypass switch connected in parallel with the first leg circuit;
after controlling the first bridge arm circuit to be conducted, the method further comprises the following steps:
and controlling the bypass switch to be closed, and controlling the first bridge arm circuit to be switched off.
3. The converter testing method according to claim 2, wherein the converter further comprises a control module and a drive module;
detecting a current of the half-bridge circuit, and determining whether a pass condition is satisfied by a shoot-through protection of the converter according to the current comprises:
the driving module controls the second bridge arm circuit to be turned off;
the control module detects the current of the half-bridge circuit, and when the current of the half-bridge circuit is zero, the through protection of the current converter is determined to meet the passing condition.
4. The converter testing method according to claim 2, wherein detecting a current of the half-bridge circuit, and determining whether a pass condition is satisfied for through protection of the converter according to the current comprises:
detecting the current of the half-bridge circuit;
and when the current of the half-bridge circuit meets the preset current, determining that the through protection of the current converter meets the passing condition.
5. The converter testing method of claim 4, wherein detecting the current of the half bridge circuit comprises:
and when the conduction time of the second bridge arm circuit is greater than or equal to the preset time, detecting the current of the half-bridge circuit.
6. The converter testing method according to claim 1, further comprising, before controlling the first leg circuit to conduct:
and charging the voltage of the capacitor of the half-bridge circuit to a preset voltage.
7. A converter is characterized by comprising a half-bridge circuit, a bypass circuit and a control module;
the half-bridge circuit comprises a first bridge arm circuit and a second bridge arm circuit, the first bridge arm circuit and the second bridge arm circuit are respectively one of an upper bridge arm circuit and a lower bridge arm circuit, and the bypass circuit is connected with the first bridge arm circuit in parallel; the first bridge arm circuit is connected with the second bridge arm circuit in series;
the control end of the first bridge arm circuit is connected with the control module, and the control module is used for controlling the first bridge arm circuit to be conducted;
the control end of the second bridge arm circuit is connected with the control module, and the control module is further used for controlling the second bridge arm circuit to be conducted;
the control module is further used for detecting the current of the half-bridge circuit and determining whether the through protection of the converter meets the passing condition according to the current.
8. The converter according to claim 7, wherein the bypass circuit comprises a bypass switch connected in parallel with the first leg circuit;
and the control end of the bypass switch is connected with the control module, and the control module is also used for controlling the bypass switch to be closed and the first bridge arm circuit to be switched off after the first bridge arm circuit is switched on.
9. The converter according to claim 7, further comprising a drive module;
the control module is connected with the control end of the second bridge arm circuit through the driving module, and the driving module is used for controlling the second bridge arm circuit to be switched off when the first bridge arm circuit is switched on and the second bridge arm circuit is switched on;
the control module is used for detecting the current of the half-bridge circuit, and when the current of the half-bridge circuit is zero, the through protection of the current converter is determined to meet the passing condition.
10. The converter according to claim 7, wherein the control module is further configured to detect a current of the half-bridge circuit when the first leg circuit is turned on and the second leg circuit is turned on, and determine that a pass condition is met for a shoot-through protection of the converter when the current of the half-bridge circuit meets a preset current.
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| CN202110994877.7A CN113740644A (en) | 2021-08-27 | 2021-08-27 | Current converter testing method and current converter |
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