CN112485628A - Self-checking system of frequency converter - Google Patents
Self-checking system of frequency converter Download PDFInfo
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- CN112485628A CN112485628A CN202011288210.7A CN202011288210A CN112485628A CN 112485628 A CN112485628 A CN 112485628A CN 202011288210 A CN202011288210 A CN 202011288210A CN 112485628 A CN112485628 A CN 112485628A
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2608—Circuits therefor for testing bipolar transistors
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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Abstract
The invention discloses a self-checking system of a frequency converter and the frequency converter, which comprises: the detection circuit comprises a first voltage output end and a second voltage output end; the detection result feedback module comprises a detection voltage judgment module and a first exclusive-or logic module, wherein the voltage judgment module is respectively connected with the first voltage output end and the second voltage output end and is used for outputting a corresponding logic level Vout according to the voltages of the first voltage output end and the second voltage output end; and the first exclusive-or logic module is used for carrying out exclusive-or operation on the logic level Vout and the driving signal VG and outputting a fault feedback signal Warn to the main control module. By adopting the technical scheme of the invention, self-checking can be carried out before the frequency converter, and whether the frequency converter is over-current or not can be detected after the frequency converter is started.
Description
Technical Field
The invention relates to the field of frequency converter detection, in particular to a self-checking system of a frequency converter.
Background
The existing photovoltaic frequency converter product is provided with a rectifying module and an inverting module, and with the requirement of high efficiency, the three-level photovoltaic frequency converter and the five-level photovoltaic frequency converter slowly appear in front of people. The safety of the module is more and more emphasized while the demand for power modules such as IGBT is more and more. At present, photovoltaic frequency converters and other products using power modules are particularly under the condition of high power, the IGBT module self-checking function is lacked before actual operation, and when the modules are transported for a long time in a long distance or are damaged after long-time unstable operation, huge safety accidents are likely to be caused when equipment is directly operated; on the other hand, the detection accuracy of the system for the overcurrent of the IGBT module during normal operation needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problem that safety accidents occur during operation due to the fact that an IGBT in a frequency converter in the prior art is damaged, and provides a self-checking system of the frequency converter.
In an embodiment of the present invention, a self-checking system for a frequency converter is provided, which includes:
the main control module is used for sending a mode signal mod for controlling the working mode of the frequency converter and a driving signal VG for controlling the on-off of the IGBT of the frequency converter;
the detection circuit comprises resistors R1, R2 and R3 and a diode D which are sequentially connected in series between a high level V1 and the source electrode of the IGBT, wherein a first voltage output end is connected between the resistors R1 and R2, and a second voltage output end is connected between the resistors R2 and R3;
a detection result feedback module including a detection voltage judgment module and a first exclusive-OR logic module,
the voltage judging module is respectively connected with the first voltage output end and the second voltage output end and is used for outputting corresponding logic levels Vout according to the voltages of the first voltage output end and the second voltage output end;
and the first exclusive-or logic module is used for carrying out exclusive-or operation on the logic level Vout and the driving signal VG and outputting a fault feedback signal Warn to the main control module.
In the embodiment of the present invention, the frequency converter self-inspection system further includes an overcurrent detection control module, configured to control the frequency converter self-inspection system to detect whether the IGBT is overcurrent when the frequency converter is in a normal operating mode, where the overcurrent detection control module includes:
an inverter for inverting the driving signal VG;
a second exclusive-or logic block for exclusive-or-operating an output level of the inverter with the mode signal mod;
and the base of the triode Q1 is connected with the output end of the second exclusive-OR logic module, the collector of the triode Q1 is connected with the second voltage output end of the detection circuit, and the emitter of the triode Q1 is grounded.
In the embodiment of the present invention, when the mode signal mod is at a low level, the frequency converter operates in the test mode, and when the mode signal mod is at a high level, the frequency converter operates in the normal operation mode.
In the embodiment of the present invention, when the mode signal mod is low and the driving signal VG is low,
if the first voltage is smaller than a set first set voltage and the second voltage is smaller than a second set voltage, the logic level Vout output by the voltage judgment module is a high level and the fault feedback signal Warn is a high level, otherwise, the logic level Vout output by the voltage judgment module is a low level and the fault feedback signal Warn is a low level.
In the embodiment of the present invention, when the mode signal mod is low and the driving signal VG is high,
if the first voltage is smaller than a set first set voltage and the second voltage is smaller than a second set voltage, the logic level Vout output by the voltage judgment module is a high level, the fault feedback signal Warn is a high level, the main control module sets a fault flag bit to be 1, otherwise, the logic level Vout output by the voltage judgment module is a low level, and the fault feedback signal Warn is a low level.
In the embodiment of the present invention, when the mode signal mod is at a high level and the driving signal VG is at a low level, the transistor Q1 is turned on, the first voltage and the second voltage are at low levels, the logic level Vout output by the voltage determination module is at a low level, and the fault feedback signal Warn is at a low level.
In the embodiment of the present invention, when the mode signal mod is at a high level and the driving signal VG is at a high level, the transistor Q1 is turned off, and the voltage determining module detects the first voltage and the second voltage, so as to determine whether the IGBT has an overcurrent.
In this embodiment of the present invention, when the first voltage is greater than the first setting voltage, the logic level Vout output by the voltage determining module is a high level, and the fault feedback signal Warn is a high level.
In the embodiment of the invention, the voltage judgment module adopts a 555 timer.
In the embodiment of the invention, the first voltage output end is connected with a pin THRES of a 555 timer, the second voltage output end is connected with a pin VTHRES of the 555 timer, the first set voltage is 2/3VDD, the second set voltage is 1/3VDD, and VDD is the supply voltage of the 555 timer.
Compared with the prior art, in the self-checking system of the frequency converter, the mode signal mod and the driving signal VG for controlling the on-off of the IGBT of the frequency converter are provided to the first XOR module and the corresponding IGBT module through the logic circuit, so that the detection result feedback module can generate the fault feedback signal Warn for reflecting whether the IGBT has faults or not in the corresponding mode, the self-checking before the IGBT module is electrified can be carried out, the overcurrent monitoring can be carried out when the IGBT normally operates, the fault feedback signal Warn is fed back to the main control module, and the main control module can take corresponding protection measures for the frequency converter according to the fault feedback signal Warn, thereby effectively protecting a system circuit applied by the frequency converter.
Drawings
Fig. 1 is a schematic diagram of an application environment of a self-test system of a frequency converter according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a self-test system of a frequency converter according to an embodiment of the present invention.
Fig. 3 is a schematic working flow diagram of a self-inspection system of a frequency converter according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the frequency converter self-inspection system according to the embodiment of the present invention is used for detecting each IGBT in two frequency converters respectively located on a grid side and a motor side. In fig. 1, a breaker K1 is provided in the grid-side breaker, and a breaker K2 is provided in the bus bar. The main control module 1 is used for sending a mode signal mod for controlling the working mode of the frequency converter and a driving signal VG for controlling the on-off of the IGBT of the frequency converter, receiving a fault feedback signal Warn, and controlling the on-off of the circuit breaker K1 and the circuit breaker K2 according to the fault feedback signal Warn, so that the frequency converter is protected.
As shown in fig. 2, the frequency converter self-testing system according to the embodiment of the present invention further includes a detection circuit 2, a detection result feedback module 3, and an over-current detection control module 4. Note that, one inverter generally has 6 IGBTs, and in this embodiment, detection of one of the IGBTs is described.
The detection circuit 2 comprises resistors R1, R2 and R3 and diodes D1, D2 and D3 which are sequentially connected in series between a high level V1 and the source of the IGBT, a first voltage output end P1 is connected between the resistors R1 and R2, and a second voltage output end P2 is connected between the resistors R2 and R3. The diodes D1, D2, D3 are used to protect the left circuit and prevent the power supply providing the high level V1 from being damaged due to the reverse flow of the large voltage from the source when the IGBT is operated, and therefore, one, two or more diodes may be used instead, which is not limited by the invention.
The detection result feedback module 3 includes a detection voltage determining module 31 and a first exclusive-or logic module 32.
The voltage determining module 31 is connected to the first voltage output terminal P1 and the second voltage output terminal P2 through resistors R4 and R5, respectively, and is configured to output a corresponding logic level Vout according to voltages of the first voltage output terminal P1 and the second voltage output terminal P2. In this embodiment, the voltage determining module 31 adopts a 555 timer. The first voltage output end P1 is connected with a pin THRES of the 555 timer, the second voltage output end P2 is connected with a pin VTHRES of the 555 timer, and a pin VDD of the 555 timer is powered by a voltage V2.
The first exclusive-or logic module 32 is configured to perform an exclusive-or operation on the logic level Vout and the driving signal VG, and output a fault feedback signal Warn to the main control module.
Overcurrent detection control module 4 is used for controlling the converter is when normal operating mode whether converter self-checking system detects that the IGBT overflows, overcurrent detection control module includes:
an inverter U2 for inverting the drive signal VG;
a second exclusive-or logic block U1 for exclusive-oring the output level of the inverter U2 with the mode signal mod;
and a triode Q1, wherein the base electrode of the triode Q1 is connected with the output end of the second exclusive-or logic module U1 through a resistor R6, the collector electrode of the triode Q1 is connected with the second voltage output end P2 of the detection circuit 1, and the emitter electrode of the triode Q1 is grounded.
As shown in fig. 3, in the embodiment of the present invention, the working process of the frequency converter self-checking system is as follows:
the system is started, the main control module 1 is powered on, the system initializes that K1 and K2 keep a disconnection state, the corresponding fault flag bits of the IGBT1, the IGBT2 … and the IGBT12 are 0, and the self-checking mode is entered;
the master control module 1 sets the mode signal mod to be low level, the IGBT1, the IGBT2 … and the IGBT12 switching tubes are all disconnected from pulse, and the master control module 1 detects corresponding Vward-Vward 2 signals.
Taking IGBT1 as an example (IGBT drive signal is ± 12V):
in the circuit diagram of fig. 2, mod =0, VG is low, U1 outputs low, Q1 is off, and IGB is normally off
V（THRES）=V1；
V（TRIG）=V1；
When the design is carried out, the voltage of V1 is more than or equal to the voltage of V2, the voltage design of V1 and V2 influences the proportion of resistors R1, R2 and R3
The output Vout of the 555 timer is low level, and the output Vward is low level after the Vout is XOR with VG. The corresponding fault flag in the control module 1 remains unchanged.
If the IGBT module is in fault conduction, then
VD1 represents the sum of the conduction voltage drops of the IGBT modules, D1, D2 and D3 during self-test, the conduction voltage drops of different IGBT modules are inconsistent, the current is relatively low during self-test, and the conduction voltage drop is very low. Selecting R1, R2 and R3 resistance values according to actual requirements to ensure that the resistance values are ensured at the moment
The output Vout of the 555 timer is high, and the output Vward is high after the Vout is XOR with VG. The corresponding fault flag bit in the control module 1.
The control module 1 completes the turn-off detection of all the IGBTs in the same way.
And after the control module 1 detects that the disconnection detection of all the IGBTs is completed, starting to perform the conduction test of all the IGBTs.
At this time, the IGBT drive pulse VG = +12V (high level); VQ1 is high, U1 outputs low, and Q1 is off.
When the IGBT is normally turned on,
VD1 represents the sum of the voltage drops of the IGBT module, D1, D2 and D3 during self-test, and at this time
The 555 timer outputs Vout high, i.e. Vout exclusive-ored with VG and then outputs vwann low. The corresponding fault flag in the control module 1 remains unchanged.
If the IGBT fails to open,
V（THRES）=V1；
V（TRIG）=V1；
when the design is carried out, the voltage of V1 is more than or equal to the voltage of V2, the voltage design of V1 and V2 influences the proportion of resistors R1, R2 and R3
The 555 timer output Vout is low, i.e., Vo1 low is xored with Vq1 high, and the vwann output is high. The corresponding fault flag bit in the control module 1 is set to 1.
After the self-checking is finished, the system analyzes the fault, and the grid photovoltaic access K1 and K2 are forbidden to be kept in a disconnected state when the fault occurs; and blocking all IGBT pulses and giving an alarm for prompting.
And (4) the system is free from fault in self-checking and enters a preparation operation mode.
When the mod signal is high during normal operation of the system, the Q1 is turned off when the VQ1 signal is high, and is turned on when the VQ1 signal is low, that is, the overcurrent signal is detected by the system through the 555 timer when the IGBT is turned on.
When the system normally operates, the conduction voltage drop Vce between the base electrode and the emitter electrode of the IGBT is increased along with the increase of the current flowing through the module, and the voltage drop of the Vce can be used for representing the magnitude of the current flowing through the module by designing a reasonable overcurrent protection value according to the characteristics of the module.
VD2 represents the sum of the conduction voltage drops of the IGBT module, D1, D2 and D3 in normal operation, and VD2 is smaller in low current
The output Vout of the 555 timer is high, the high level of Vq1 is exclusive or Vwan is low, and the system operates normally.
When the current gradually increases, VD2 greatly exceeds the preset value v (thres) =
，
When the current gradually increases, VD2 greatly exceeds the preset value v (thres) =
When the temperature of the water is higher than the set temperature,
the 555 timer outputs Vout as low level, the logic exclusive OR outputs Vward as high level, the system reports overcurrent fault, overcurrent protection is carried out, the IGBT module pulse signal is blocked, the module is disconnected, the access of the power grid and the photovoltaic is cut off in time, and the system prompts overcurrent fault.
In summary, in the self-checking system for the frequency converter of the present invention, the mode signal mod and the driving signal VG for controlling the on/off of the IGBT of the frequency converter are provided to the first xor module and the corresponding IGBT module through the logic circuit, so that the detection result feedback module can generate the fault feedback signal Warn for reflecting whether the IGBT fails in the corresponding mode, the IGBT module can be self-checked before being powered on, the IGBT can also be subjected to overcurrent monitoring during normal operation, and the fault feedback signal Warn is fed back to the main control module, and the main control module can take corresponding protection measures for the frequency converter according to the fault feedback signal Warn, thereby effectively protecting the system circuit applied by the frequency converter.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a converter self-checking system which characterized in that includes:
the main control module is used for sending a mode signal mod for controlling the working mode of the frequency converter and a driving signal VG for controlling the on-off of the IGBT of the frequency converter;
the detection circuit comprises resistors R1, R2 and R3 and a diode D which are sequentially connected in series between a high level V1 and the source electrode of the IGBT, wherein a first voltage output end is connected between the resistors R1 and R2, and a second voltage output end is connected between the resistors R2 and R3;
a detection result feedback module including a detection voltage judgment module and a first exclusive-OR logic module,
the voltage judging module is respectively connected with the first voltage output end and the second voltage output end and is used for outputting corresponding logic levels Vout according to the voltages of the first voltage output end and the second voltage output end;
and the first exclusive-or logic module is used for carrying out exclusive-or operation on the logic level Vout and the driving signal VG and outputting a fault feedback signal Warn to the main control module.
2. The frequency converter self-test system according to claim 1, wherein the frequency converter operates in a test mode when the mode signal mod is low, and operates in a normal operation mode when the mode signal mod is high.
3. The frequency converter self-inspection system according to claim 1, further comprising: the overcurrent detection control module is used for controlling the frequency converter to detect whether the IGBT is in overcurrent or not by the frequency converter self-checking system in the normal working mode, and the overcurrent detection control module comprises:
an inverter for inverting the driving signal VG;
a second exclusive-or logic block for exclusive-or-operating an output level of the inverter with the mode signal mod;
and the base of the triode Q1 is connected with the output end of the second exclusive-OR logic module, the collector of the triode Q1 is connected with the second voltage output end of the detection circuit, and the emitter of the triode Q1 is grounded.
4. The frequency converter self-test system according to claim 2, wherein when the mode signal mod is low and the driving signal VG is low,
if the first voltage is smaller than a set first set voltage and the second voltage is smaller than a second set voltage, the logic level Vout output by the voltage judgment module is a high level and the fault feedback signal Warn is a high level, otherwise, the logic level Vout output by the voltage judgment module is a low level and the fault feedback signal Warn is a low level.
5. The frequency converter self-test system according to claim 2, wherein when the mode signal mod is low and the driving signal VG is high,
if the first voltage is smaller than a set first set voltage and the second voltage is smaller than a second set voltage, the logic level Vout output by the voltage judgment module is a high level and the fault feedback signal Warn is a high level, otherwise, the logic level Vout output by the voltage judgment module is a low level and the fault feedback signal Warn is a low level.
6. The self-test system for frequency converters according to claim 2, wherein when the mode signal mod is at a high level and the driving signal VG is at a low level, the transistor Q1 is turned on, the first voltage and the second voltage are at a low level, the logic level Vout output by the voltage determining module is at a low level, and the fault feedback signal Warn is at a low level.
7. The self-test system for the frequency converter according to claim 6, wherein when the mode signal mod is at a high level and the driving signal VG is at a high level, the transistor Q1 is turned off, and the voltage determining module detects the first voltage and the second voltage, so as to determine whether the IGBT has an overcurrent.
8. The self-test system for frequency converters according to claim 7, wherein when the first voltage is greater than a first set voltage, the logic level Vout output by the voltage determination module is high, and the fault feedback signal Warn is high.
9. The frequency converter self-test system according to any one of claims 1 or 8, wherein the voltage judgment module adopts a 555 timer.
10. The frequency converter self-test system according to claim 9, wherein the first voltage output terminal is connected to a pin THRES of the 555 timer, the second voltage output terminal is connected to a pin VTHRES of the 555 timer, the first set voltage is 2/3VDD, the second set voltage is 1/3VDD, and VDD is a supply voltage of the 555 timer.
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