CN104377659A - Wave sealing-wave unsealing method and device, wave unsealing method and device and inverter circuit - Google Patents

Wave sealing-wave unsealing method and device, wave unsealing method and device and inverter circuit Download PDF

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CN104377659A
CN104377659A CN201310359819.2A CN201310359819A CN104377659A CN 104377659 A CN104377659 A CN 104377659A CN 201310359819 A CN201310359819 A CN 201310359819A CN 104377659 A CN104377659 A CN 104377659A
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shaped
level inverter
supervisor
auxiliary pipe
voltage
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CN104377659B (en
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毛云鹤
田卿
张龙云
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Vertiv Corp
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Liebert Corp
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Abstract

The embodiment of the invention provides a wave sealing-wave unsealing method and device, a wave unsealing method and device and an inverter circuit in order to solve the problem that when an existing wave sealing method is adopted to conduct wave sealing on T-shaped three-level inverters or an existing wave unsealing method is adopted to conduct wave unsealing on the T-shaped three-level inverters, auxiliary pipes in the T-shaped three-level inverter will be damaged. The wave sealing-wave unsealing method comprises the steps that the current passing through the end, connected with a main pipe in one T-shaped three-level inverter, of a filter in the T-shaped three-level inverter is detected; when the detected current is larger than a first threshold and the T-shaped three-level inverter is in a wave unsealing state, driving signals which are output by a wave sending unit to the main pipe in the T-shaped three-level inverter are no longer transmitted to the main pipe, the main pipe is cut off, after a first preset time period, the driving signals which are output by the wave sending unit to auxiliary pipes in the T-shaped three-level inverter are no longer transmitted to the auxiliary pipes and the auxiliary pipes are cut off.

Description

Envelope ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of envelope ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit.
Background technology
UPS(Uninterruptible Power Supply; uninterrupted power supply) refer to when exception or power-off occur alternating current input power supplying (such as civil power), can also continue to power to the load, and can power supply quality be ensured; make the impregnable device of load supplying, the reliability of powering can be ensured.Inverter is one of important technology in UPS, and the performance of inverter directly affects the efficiency of UPS complete machine, cost and reliability.
Existing UPS inverter is when adopting T-shaped three-level inverter, the structure of T-shaped three-level inverter as shown in Figure 1, when adopting existing envelope wave method, if the electric current that T-shaped three-level inverter exports detected, namely when the electric current flowing through inductance L 1 is greater than some values, the ripple unit of sending out of the switch element in T-shaped three-level inverter is driven (to send out the control end of the switch element in each switch element in ripple unit connecting T-shaped three-level inverter, send out ripple unit not shown in FIG), control the switch element Q1 of this T-shaped three-level inverter, Q2, Q3 and Q4 seals ripple simultaneously, namely close simultaneously, wherein, include a switching device and diode antiparallel with this switching device in switch element Q1, Q2, Q3 and Q4, electric capacity Cp_Q2 is the junction capacitance of switch element Q2, and electric capacity Cp_Q3 is the junction capacitance of switch element Q3.But, although have issued the signal of the switching device in shutdown switch unit Q1, Q2, Q3 and Q4 owing to sending out ripple unit simultaneously, but because the delay of Signal transmissions is different, the time delay of the control end of the switching device in cut-off signals arrival switch element Q1, Q2, Q3 and Q4 will be different.If, switching device in switch element Q2 and Q3 first receives cut-off signals, receive cut-off signals after switching device in switch element Q1 and Q4, the switching device that so just there will be in switch element Q2 and Q3 first turns off, and turns off after switching device in switch element Q1 and Q4.
Suppose that T-shaped three-level inverter is operated in positive half period, namely electric current flows to the right side of inductance L 1 from the left side of inductance L 1, and now, the switching device in switch element Q4 turns off.Better at circuit layout, when ignoring the leakage inductance of circuit, when adopting existing envelope wave method envelope ripple, if the switching device in switch element Q2 and Q3 turns off, due to the switch device conductive in switch element Q1, therefore, electric current can flow to inductance L 1 from switch element Q1, therefore, the voltage of a point is clamped to positive bus-bar voltage+U bUS, the diode current flow in switch element Q2, the voltage difference U between b, c 2 bcvoltage difference U between=0.7, a, b 2 ab=+U bUS.And when the switching device in switch element Q1 turns off, flow through the electric current of inductance L 1 by the diode continuousing flow in switch element Q4, the current potential of a point is by positive bus-bar voltage+U bUSsaltus step is negative busbar voltage-U bUS, due to U c+ U bc+ U ab=U a, therefore U bc=U ac-U ab=-U bUS-U ab, because the voltage on the junction capacitance Cp_Q3 of switch element Q3 can not be undergone mutation, therefore U bc=-U bUS-U ab=-2*U bUSthat is, instantaneous voltage on the junction capacitance Cp_Q2 of switch element Q2 can reach full busbar voltage, and after the junction capacitance Cp_Q3 of switch element Q3 has discharged, the voltage at the junction capacitance Cp_Q2 two ends of switch element Q2 can be just half of busbar voltage, and the voltage at switch element Q1 two ends is full edges generating line voltage.
Suppose that T-shaped three-level inverter is operated in negative half-cycle, namely electric current flows to the left side of inductance L 1 from the right side of inductance L 1, and now, the switching device in switch element Q1 turns off.Better at circuit layout, when ignoring the leakage inductance of circuit, when adopting existing envelope wave method envelope ripple, if the switching device in switch element Q2 and Q3 turns off, due to the switch device conductive in switch element Q4, therefore, electric current can flow to switch element Q4 from inductance L 1, now, the voltage of a point is clamped to negative busbar voltage-U bUS, the diode current flow in switch element Q3, the voltage difference U between a, b 2 abvoltage difference U between=-0.7V, b, c 2 bc=-U bUS.And when the switching device in switch element Q4 turns off, flow through the electric current of inductance L 1 by the diode continuousing flow in switch element Q1, the current potential of a point is by negative busbar voltage-U bUSsaltus step is positive bus-bar voltage+U bUS, due to U c+ U bc+ U ab=U a, therefore U ab=U ac-U bc=U bUS-U bc, because the voltage on the junction capacitance Cp_Q2 of switch element Q2 can not be undergone mutation, therefore U ab=U bUS-U bc=2*U bUSthat is, instantaneous voltage on the junction capacitance Cp_Q3 of switch element Q3 can reach full edges generating line voltage, and after the junction capacitance Cp_Q2 of switch element Q2 has discharged, the voltage at the junction capacitance Cp_Q3 two ends of switch element Q3 can be just half of busbar voltage, and the voltage at switch element Q1 two ends is full edges generating line voltage.
Therefore, when adopting existing envelope wave method, likely there will be first Feng Fuguan (switching device in switch element Q2, Q3), seal the situation of supervisor's (switching device in switch element Q1, Q4) again, as the above analysis, the voltage that now auxiliary pipe bears instantaneously can be full edges generating line voltage, and the maximum voltage that can bear due to auxiliary pipe is generally slightly larger than half of busbar voltage, therefore, there will be the situation of auxiliary pipe overvoltage.And, in envelope wave process, as switch element Q1(or Q4) in switching device turn off, and after circuit stability, switch element Q1(or Q4) voltage that bears is full edges generating line voltage, due to switch element Q1(or Q4) maximum voltage that can bear is generally slightly larger than full edges generating line voltage, therefore, switch element Q1(or Q4) in moment of turning off of switching device, switch element Q1(or Q4) voltage that bears may be greater than its maximum voltage that can bear.
When adopting existing deblocking wave method, if the electric current that T-shaped three-level inverter exports detected, namely when the electric current flowing through inductance L 1 is no longer greater than some values, the ripple unit of sending out of the switch element in T-shaped three-level inverter is driven (to send out the control end of the switching device in each switch element in ripple unit connecting T-shaped three-level inverter, send out ripple unit not shown in FIG), control switch element Q1, Q2, Q3 and Q4 deblocking ripple simultaneously of this T-shaped three-level inverter, namely simultaneously open-minded.But, although have issued the signal of the switching device opened in switch element Q1, Q2, Q3 and Q4 owing to sending out ripple unit simultaneously, but because the delay of Signal transmissions is different, the time delay opening the control end of the switching device in signal arrival switch element Q1, Q2, Q3 and Q4 will be different.If, switching device in switch element Q1 and Q4 first receives and opens signal, receive after switching device in switch element Q2 and Q3 and open signal, the switching device that so just there will be in switch element Q1 and Q4 is first open-minded, and open-minded after switching device in switch element Q2 and Q3.
Suppose that electric current flows to the right side of inductance L 1 from the left side of inductance L 1, now, the switching device in switch element Q1, Q2, Q3 and Q4 all turns off, and electric current flows through the diode in switch element Q4, and the current potential of a point is negative busbar voltage-U bUS, the diode current flow in switch element Q3, the voltage difference U between a, b 2 abvoltage difference U between=-0.7V, b, c 2 bc=-U bUS.When adopting existing deblocking wave method deblocking ripple, the switch device conductive in switch element Q1, the diode in switch element Q4 is subject to reverse voltage and turns off, and electric current can flow to inductance L 1 from switch element Q1, and therefore, the voltage of a point is by negative busbar voltage-U bUSjump to positive bus-bar voltage+U bUS, due to U c+ U bc+ U ab=U a, therefore U ab=U ac-U bc=U bUS-U bc, because the voltage on the junction capacitance Cp_Q2 of switch element Q2 can not be undergone mutation, therefore U ab=U bUS-U bc=2*U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q3 of switch element Q3 can reach full edges generating line voltage.When the switching device in switch element Q2 is opened, after the junction capacitance Cp_Q2 of switch element Q2 has discharged, the voltage at the junction capacitance Cp_Q3 two ends of switch element Q3 has been half of busbar voltage, and the voltage at switch element Q1 two ends is full edges generating line voltage.
Suppose that electric current flows to the left side of inductance L 1 from the right side of inductance L 1, now, the switching device in switch element Q1, Q2, Q3 and Q4 all turns off, and electric current flows through the diode in switch element Q1, and the current potential of a point is positive bus-bar voltage+U bUS, the diode current flow in switch element Q2, the voltage difference U between b, c 2 bcvoltage difference U between=0.7, a, b 2 ab=+U bUS.When adopting existing deblocking wave method deblocking ripple, the switch device conductive in switch element Q4, the diode in switch element Q1 is subject to reverse voltage and turns off, and electric current can flow to switch element Q4 from inductance L 1, and therefore, the current potential of a point is by positive bus-bar voltage+U bUSsaltus step is negative busbar voltage-U bUS, due to U c+ U bc+ U ab=U a, therefore U bc=U ac-U ab=-U bUS-U ab, because the voltage on the junction capacitance Cp_Q3 of switch element Q3 can not be undergone mutation, therefore U bc=-U bUS-U ab=-2*U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q2 of switch element Q2 can reach full edges generating line voltage.When the switching device in switch element Q3 is opened, after the junction capacitance Cp_Q3 of switch element Q3 has discharged, the voltage at the junction capacitance Cp_Q2 two ends of switch element Q2 has been half of busbar voltage, and the voltage at switch element Q1 two ends is full edges generating line voltage.
Therefore, when adopting existing deblocking wave method, likely there will be first deblocking supervisor (switching device in switch element Q1, Q4), the situation of the auxiliary pipe of deblocking (switching device in switch element Q2, Q3) again, as the above analysis, the voltage that now auxiliary pipe bears instantaneously can be full edges generating line voltage, and the maximum voltage that can bear due to auxiliary pipe is generally slightly larger than half of busbar voltage, therefore, there will be the situation of auxiliary pipe overvoltage.And, in deblocking wave process, as switch element Q1(or Q4) in switching device open-minded, and after circuit stability, switch element Q4(or Q1) voltage that bears is full edges generating line voltage, due to switch element Q1(or Q4) maximum voltage that can bear is generally slightly larger than full edges generating line voltage, therefore, switch element Q1(or Q4) in moment of turning off of switching device, switch element Q4(or Q1) voltage that bears may be greater than its maximum voltage that can bear.
In sum, when adopting existing envelope wave method to seal ripple to T-shaped three-level inverter, due to the first tube sealing of auxiliary pipe may be there is, tube sealing after supervisor, thus the instantaneous voltage causing auxiliary pipe to bear is greater than the maximum voltage that it can bear, and then the problem causing the auxiliary pipe in T-shaped three-level inverter to damage; And, when adopting existing deblocking wave method deblocking ripple, first open-minded due to supervisor may be there is, open-minded after auxiliary pipe, thus the instantaneous voltage causing auxiliary pipe to bear is greater than the maximum voltage that it can bear, and then the problem causing the auxiliary pipe in T-shaped three-level inverter to damage.
Summary of the invention
Embodiments provide a kind of envelope ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit, when adopting existing envelope wave method to carry out envelope ripple to T-shaped three-level inverter in order to solve, due to the situation of the first tube sealing of auxiliary pipe, the rear tube sealing of supervisor may be there is, thus cause the problem that the auxiliary pipe in T-shaped three-level inverter damages; And when solving the existing deblocking wave method of employing to T-shaped three-level inverter deblocking ripple, first open-minded due to supervisor may be there is, situation about opening after auxiliary pipe, thus the problem causing that the auxiliary pipe in T-shaped three-level inverter damages
Based on the problems referred to above, one envelope ripple-deblocking wave method that the embodiment of the present invention provides, comprising:
Detect the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
When the electric current detected is greater than first threshold and described T-shaped three-level inverter is in the wavy state of deblocking, no longer the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
One envelope ripple-deblocking wave apparatus that the embodiment of the present invention provides, comprising:
First detection module, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
First control module, for be greater than first threshold at the electric current detected and described T-shaped three-level inverter is in deblocking wavy state time, no longer the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
A kind of deblocking wave method that the embodiment of the present invention provides, comprising:
Detect the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
When the electric current detected is not more than the 3rd threshold value and described T-shaped three-level inverter is in the wavy state of envelope, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal of the supervisor exported in described T-shaped three-level inverter by described ripple unit is transferred to described supervisor, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
A kind of deblocking wave apparatus that the embodiment of the present invention provides, comprising:
Second detection module, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
Second control module, for be not more than at the electric current detected T-shaped three-level inverter described in the 3rd threshold value be in envelope wavy state time, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal of the supervisor exported in described T-shaped three-level inverter by described ripple unit is transferred to described supervisor, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
A kind of inverter circuit that the embodiment of the present invention provides, comprises at least one T-shaped three-level inverter, sends out ripple unit, also comprises control unit and at least one detection judging unit; Described ripple unit connection control unit, described control unit connects the control end of the supervisor in each T-shaped three-level inverter and the control end of auxiliary pipe respectively, and each detection judging unit connects the one end be connected with supervisor in the filter in a T-shaped three-level inverter;
Each detection judging unit, for detect in the filter in the T-shaped three-level inverter that is connected with self with the electric current be responsible for one end of being connected and flow through, and detect described electric current be greater than T-shaped three-level inverter described in first threshold be in deblocking wavy state time, send the first notification signal to control unit;
Described control unit, for after receiving the first notification signal of Autonomous test judging unit, the drive singal of the supervisor no longer exported to by a ripple unit in the T-shaped three-level inverter of described detection judging unit connection is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported to by a ripple unit in the T-shaped three-level inverter of described detection judging unit connection is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
The another kind of inverter circuit that the embodiment of the present invention provides, comprises at least one T-shaped three-level inverter, sends out ripple unit, also comprises control unit and at least one detection judging unit; Described ripple unit connection control unit, described control unit connects the control end of the supervisor in each T-shaped three-level inverter and the control end of auxiliary pipe respectively, and each detection judging unit connects the one end be connected with supervisor in the filter in a T-shaped three-level inverter;
Each detection judging unit, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in the T-shaped three-level inverter that is connected with self is flow through, and when detecting that described electric current is not more than the 3rd threshold value and described T-shaped three-level inverter is in the wavy state of envelope, send third notice signal to control unit;
Described control unit, for after receiving the third notice signal of Autonomous test judging unit, the auxiliary pipe controlled in the T-shaped three-level inverter of described detection judging unit connection is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that in described T-shaped three-level inverter, non-length is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, supervisor in the T-shaped three-level inverter connect described detection judging unit is open-minded, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage is connect the zero cross signal comprising the voltage of one end of the switch element of supervisor in the filter in the T-shaped three-level inverter that connects of described detection judging unit.
The beneficial effect of the embodiment of the present invention comprises:
Envelope ripple-deblocking wave method that the embodiment of the present invention provides and device, deblocking wave method and device and inverter circuit, by detecting the electric current that one end that in the filter in each T-shaped three-level inverter, connection comprises the switch element of supervisor is flow through, and detect that this electric current is greater than the T-shaped three-level inverter of first threshold for one, the drive singal no longer a ripple unit being exported to the switching device comprised in the switch element of supervisor in this T-shaped three-level inverter is transferred to this switching device, and turn off this switching device, and wait for the first preset duration, and after the first preset duration terminates, the drive singal no longer a ripple unit being exported to the switching device comprised in the switch element of auxiliary pipe in this T-shaped three-level inverter is transferred to this switching device, and turn off this switching device, thus ensure that T-shaped three-level inverter is when sealing ripple, be responsible for first tube sealing, tube sealing after auxiliary pipe, avoid occurring that instantaneous voltage that auxiliary pipe bears is greater than the situation of the maximum voltage that it can bear, thus overcome owing to bearing the problem that voltage is excessive and auxiliary pipe that is that cause is damaged.In addition, by detecting the electric current that one end that in the filter in each T-shaped three-level inverter, connection comprises the switch element of supervisor is flow through, and detect that described electric current is not more than the T-shaped three-level inverter of the 3rd threshold value for one, the switching device controlling to comprise in the switch element of auxiliary pipe in this T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the switch element comprising the auxiliary pipe that non-length is led to is determined according to the zero cross signal of voltage, and the switching device turned off in the switch element determined, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the switching device comprised in the switch element of supervisor in this T-shaped three-level inverter, and the drive singal sending out the switching device that ripple unit is exported in this T-shaped three-level inverter in each switch element is transferred to switching device, thus ensure that T-shaped three-level inverter is when deblocking ripple, auxiliary pipe is first opened, it is rear open-minded to be responsible for, avoid occurring that the instantaneous voltage that auxiliary pipe bears is greater than its maximum voltage that can bear, thus overcome owing to bearing the problem that voltage is excessive and auxiliary pipe that is that cause is damaged.
Accompanying drawing explanation
Fig. 1 is the structural representation of T-shaped three-level inverter of the prior art;
The flow chart of one of envelope ripple-deblocking wave method that Fig. 2 provides for the embodiment of the present invention;
The flow chart of envelope ripple-deblocking wave method two that Fig. 3 provides for the embodiment of the present invention;
The flow chart of the deblocking wave method that Fig. 4 provides for the embodiment of the present invention;
The structural representation of envelope ripple-deblocking wave apparatus that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the deblocking wave apparatus that Fig. 6 provides for the embodiment of the present invention;
The schematic diagram of one of the structure of the single-phase inversion circuit that Fig. 7 provides for the embodiment of the present invention;
The schematic diagram of one of the structure of the three-phase inverting circuit that Fig. 8 provides for the embodiment of the present invention;
The schematic diagram of the structure two of the single-phase inversion circuit that Fig. 9 a provides for the embodiment of the present invention;
The schematic diagram of the structure two of the three-phase inverting circuit that Fig. 9 b provides for the embodiment of the present invention.
Embodiment
When adopting existing envelope wave method to carry out envelope ripple to T-shaped three-level inverter, the situation of the first tube sealing of auxiliary pipe, the rear tube sealing of supervisor may be there is, and when after the first tube sealing of auxiliary pipe, supervisor during tube sealing, the instantaneous voltage that auxiliary pipe in T-shaped three-level inverter bears can be greater than its maximum voltage that can bear, therefore, this may cause supervisor, auxiliary pipe in T-shaped three-level inverter to be damaged due to the overtension born.And, when adopting existing deblocking wave method to carry out deblocking ripple to T-shaped three-level inverter, may there is being responsible for the situation first opened, open after auxiliary pipe, and first open when being responsible for, when opening after auxiliary pipe, the instantaneous voltage that auxiliary pipe in T-shaped three-level inverter bears can be greater than its maximum voltage that can bear, therefore, this may cause the auxiliary pipe in T-shaped three-level inverter to be damaged due to the overtension born.Therefore, embodiments provide a kind of envelope ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit, tube sealing after the first tube sealing of the supervisor in T-shaped three-level inverter, auxiliary pipe can be made when sealing ripple, auxiliary pipe in T-shaped three-level inverter can be made first to open when deblocking ripple, be responsible for after open-minded, thus overcome the problem that the auxiliary pipe in T-shaped three-level inverter is damaged due to the overtension born.
Below in conjunction with Figure of description, the embodiment of the envelope ripple-deblocking wave method provide the embodiment of the present invention and device, deblocking wave method and device and inverter circuit is described.
One envelope ripple-deblocking wave method that the embodiment of the present invention provides, as shown in Figure 2, the method comprises:
The electric current that the one end be connected with the supervisor in this T-shaped three-level inverter in filter in S201, a detection T-shaped three-level inverter is flow through;
S202, determine that the electric current detected is greater than first threshold and this T-shaped three-level inverter is in the state of deblocking ripple;
The state that T-shaped three-level inverter is in deblocking ripple refers to that the direct current signal received can be converted to the operating state of AC signal by this T-shaped three-level inverter under the control sending out the drive singal that ripple unit exports.
S203, be no longer transferred to described supervisor by sending out the drive singal of supervisor that ripple unit exports in this T-shaped three-level inverter, and turn off described supervisor, and wait for the first preset duration;
Because each T-shaped three-level inverter comprises two supervisors, for the T-shaped three-level inverter shown in Fig. 1, two supervisors refer to the switching device in switch element Q1 and the switching device in switch element Q4, therefore, when the electric current detected is greater than first threshold, no longer the drive singal sending out the supervisor that ripple unit is exported in this T-shaped three-level inverter is transferred to described supervisor, refer to that the drive singal of the switching device in the switch element Q1 no longer exported to by a ripple unit in the T-shaped three-level inverter shown in Fig. 1 is transferred to this switching device, and no longer the drive singal sending out the switching device that ripple unit is exported in the T-shaped three-level inverter breaker in middle unit Q4 shown in Fig. 1 is transferred to this switching device, turn off supervisor and refer to the switching device in the switch element Q1 turned off in the T-shaped three-level inverter shown in Fig. 1 and the switching device in switch element Q4, turn off if these two switching devices are low levels, so to the control end output low level signal of the switching device in the switch element Q1 in the T-shaped three-level inverter shown in Fig. 1, and to the control end output low level signal of the switching device in switch element Q4, turn off if these two switching devices are high level, control end so to the switching device in the switch element Q1 in the T-shaped three-level inverter shown in Fig. 1 exports high level signal, and exports high level signal to the control end of the switching device in switch element Q4.Two equal reliable turn-offs of supervisor after the first preset duration terminates in T-shaped three-level inverter.
S204, after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe;
Because each T-shaped three-level inverter comprises two auxiliary pipes, for the T-shaped three-level inverter shown in Fig. 1, two auxiliary pipes refer to the switching device in switch element Q2 and the switching device in switch element Q3, therefore, when the electric current detected is greater than first threshold, no longer the drive singal sending out the auxiliary pipe that ripple unit is exported in this T-shaped three-level inverter is transferred to described auxiliary pipe, refer to that the drive singal of the switching device in the switch element Q2 no longer exported to by a ripple unit in the T-shaped three-level inverter shown in Fig. 1 is transferred to this switching device, and no longer the drive singal sending out the switching device that ripple unit is exported in the T-shaped three-level inverter breaker in middle unit Q3 shown in Fig. 1 is transferred to this switching device, turn off auxiliary pipe and refer to the switching device in the switch element Q2 turned off in the T-shaped three-level inverter shown in Fig. 1 and the switching device in switch element Q3, turn off if these two switching devices are low levels, so to the control end output low level signal of the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1, and to the control end output low level signal of the switching device in switch element Q3, turn off if these two switching devices are high level, control end so to the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1 exports high level signal, and exports high level signal to the control end of the switching device in switch element Q3.
In the process that S202-S204 performs, S201 is performing always.
Below for the T-shaped three-level inverter shown in Fig. 1, when analysis adopts the envelope wave method described in S202-S204 to carry out envelope ripple to T-shaped three-level inverter, the voltage that the supervisor in this T-shaped three-level inverter and auxiliary pipe bear.Wherein, filter in T-shaped three-level inverter shown in Fig. 1 comprises inductance L 1 and electric capacity C1, therefore, the electric current that the one end be connected with the supervisor in this T-shaped three-level inverter in filter in this T-shaped three-level inverter is flow through, just refer to the electric current of a point, namely flow through the electric current of inductance L 1, certainly, the filter in T-shaped three-level inverter can also adopt other forms of filter.
Suppose that T-shaped three-level inverter is operated in positive half period, namely electric current flows to the filter this T-shaped three-level inverter from a point, and now, the switching device in switch element Q4 turns off, and the switching device in switch element Q2 is open-minded.When the envelope wave method envelope ripple adopting the embodiment of the present invention to provide, when namely adopting the envelope wave method envelope ripple described in S202-S204, if the switching device in switch element Q1 and Q4 turns off, namely shutoff is responsible for, then the switching device of electric current in switch element Q2 and the diode in switch element Q3 flow to filter, therefore, the voltage of a point is by positive bus-bar voltage+U bUSjump to the voltage of neutral point N, after circuit stability, switch element Q1 bears half of busbar voltage; Voltage difference U between c, b 2 cbvoltage difference U between=0.3V, b, a 2 ba=0.7V.And when the switching device in switch element Q2 and Q3 turns off, when namely auxiliary pipe turns off, electric current flows to filter by the diode in switch element Q4, and therefore, the current potential of a point is negative busbar voltage-U by the voltage jump of neutral point N bUS, due to U c+ U bc+ U ab=U a, therefore U cb=U ca-U ba=-U bUS-U ba, because the voltage on the junction capacitance Cp_Q3 of switch element Q3 can not be undergone mutation, therefore U cb=U ca-U ba=-U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q2 of switch element Q2 can reach half busbar voltage.
Suppose that T-shaped three-level inverter is operated in negative half-cycle, namely electric current flows to a point from the filter this T-shaped three-level inverter, and now, the switching device in switch element Q1 turns off, and the switching device in switch element Q3 is open-minded.When the envelope wave method envelope ripple adopting the embodiment of the present invention to provide, when namely adopting the envelope wave method envelope ripple described in S202-S204, if the switching device in switch element Q1 and Q4 turns off, namely shutoff is responsible for, then the diode of electric current in switch element Q2 and the switching device in switch element Q3 flow to filter, now, the voltage of a point is by negative busbar voltage-U bUSjump to the voltage of neutral point N, after circuit stability, switch element Q4 bears half of busbar voltage; Voltage difference U between b, c 2 bcvoltage difference U between=0.7V, a, b 2 ab=0.3V.And when the switching device in switch element Q2 and Q3 turns off, when namely auxiliary pipe turns off, electric current flows to filter by the diode in switch element Q1, and the current potential of a point is positive bus-bar voltage+U by neutral point voltage saltus step bUS, due to U c+ U bc+ U ab=U a, therefore U ab=U ac-U bc=U bUS-U bc, because the voltage on the junction capacitance Cp_Q2 of switch element Q2 can not be undergone mutation, therefore U ab=U bUS-U bc=U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q3 of switch element Q3 can reach half of busbar voltage.
Due to, the maximum voltage that in T-shaped three-level inverter, auxiliary pipe can bear is generally slightly larger than half of busbar voltage, the maximum voltage that supervisor can bear is generally slightly larger than full edges generating line voltage, therefore, when the envelope wave method adopting the embodiment of the present invention to provide carries out envelope ripple to T-shaped three-level inverter, can ensure that in this T-shaped three-level inverter, the instantaneous voltage born of auxiliary pipe can not be greater than its maximum voltage that can bear, overcome owing to bearing voltage excessive, cause the problem that the auxiliary pipe in T-shaped three-level inverter damages.
Further, one envelope ripple-deblocking wave method that the embodiment of the present invention provides, as shown in Figure 3, also comprises:
S301, determine the electric current detected be not more than Second Threshold and described T-shaped three-level inverter be in envelope wavy state;
The state that T-shaped three-level inverter is in envelope ripple refers to that in this T-shaped three-level inverter two supervisors and two auxiliary Guan Jun are in the state of shutoff.
S302, the auxiliary pipe controlled in this T-shaped three-level inverter are open-minded, and wait for the second preset duration;
Because each T-shaped three-level inverter comprises two auxiliary pipes, for the T-shaped three-level inverter shown in Fig. 1, two auxiliary pipes refer to the switching device in switch element Q2 and the switching device in switch element Q3, therefore, the auxiliary pipe controlled in T-shaped three-level inverter is opened and is referred to, by the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1 and the switching device in switch element Q3 all open-minded, if these two switching devices are high level conductings, control end so to the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1 exports high level signal, and export high level signal to the control end of the switching device in switch element Q3, if these two switching devices are low level conductings, so to the control end output low level signal of the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1, and to the control end output low level signal of the switching device in switch element Q3.After the second preset duration terminates, two auxiliary pipes in T-shaped three-level inverter are all reliably open-minded.
S303, after the second preset duration terminates, determine according to the zero cross signal of voltage the auxiliary pipe that non-length in described T-shaped three-level inverter is logical, and turn off the logical auxiliary pipe of the non-length determined, and wait for the 3rd preset duration; The zero cross signal of voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter;
Determine that this T-shaped three-level inverter is operated in positive half period by the zero cross signal of voltage, be still operated in negative half-cycle.When this T-shaped three-level inverter is operated in positive half period, for the three-level inverter in Fig. 1, the auxiliary pipe that the non-length in this T-shaped three-level inverter is led to is the switching device in switch element Q3; When this T-shaped three-level inverter is operated in negative half-cycle, for the three-level inverter in Fig. 1, the auxiliary pipe that the non-length in this T-shaped three-level inverter is led to is the switching device in switch element Q2.After the 3rd preset duration terminates, the auxiliary pipe reliable turn-off that the non-length in T-shaped three-level inverter is logical.
S304, after the 3rd preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe;
Because each T-shaped three-level inverter comprises two supervisors, for the T-shaped three-level inverter shown in Fig. 1, two supervisors refer to the switching device in switch element Q1 and the switching device in switch element Q4, therefore, the drive singal sending out the supervisor that ripple unit is exported in this T-shaped three-level inverter is transferred to described supervisor, refer to and the drive singal of the switching device sent out in switch element Q1 that ripple unit exports in the T-shaped three-level inverter shown in Fig. 1 is transferred to this switching device, and the drive singal sending out the switching device that ripple unit is exported in the T-shaped three-level inverter breaker in middle unit Q4 shown in Fig. 1 is transferred to this switching device.
Because each T-shaped three-level inverter comprises two auxiliary pipes, for the T-shaped three-level inverter shown in Fig. 1, two auxiliary pipes refer to the switching device in switch element Q2 and the switching device in switch element Q3, therefore, the drive singal sending out the auxiliary pipe that ripple unit is exported in this T-shaped three-level inverter is transferred to described auxiliary pipe, refer to and the drive singal of the switching device sent out in switch element Q2 that ripple unit exports in the T-shaped three-level inverter shown in Fig. 1 is transferred to this switching device, and the drive singal sending out the switching device that ripple unit is exported in the T-shaped three-level inverter breaker in middle unit Q3 shown in Fig. 1 is transferred to this switching device.
The embodiment of the present invention also provides a kind of deblocking wave method, and as shown in Figure 4, the method comprises:
The electric current that the one end be connected with the supervisor in this T-shaped three-level inverter in filter in S401, a detection T-shaped three-level inverter is flow through;
S402, determine the electric current detected be not more than the 3rd threshold value and described T-shaped three-level inverter be in envelope wavy state;
S403, the auxiliary pipe controlled in this T-shaped three-level inverter are open-minded, and wait for the 4th preset duration;
After the 4th preset duration terminates, two auxiliary pipes in T-shaped three-level inverter are all reliably open-minded.
S404, after the 4th preset duration terminates, determine according to the zero cross signal of voltage the auxiliary pipe that non-length in described T-shaped three-level inverter is logical, and turn off the logical auxiliary pipe of the non-length determined, and wait for the 5th preset duration; The zero cross signal of voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter;
After the 5th preset duration terminates, the auxiliary pipe reliable turn-off that the non-length in T-shaped three-level inverter is logical.
S405, after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe.
In the process that S402-S405 performs, S401 is performing always.
Below for the T-shaped three-level inverter shown in Fig. 1, when analysis adopts the deblocking wave method described in S402-S405 to carry out deblocking ripple to T-shaped three-level inverter, the voltage that the supervisor in this T-shaped three-level inverter and auxiliary pipe bear.Wherein, filter in T-shaped three-level inverter shown in Fig. 1 comprises inductance L 1 and electric capacity C1, therefore, the electric current that the one end be connected with the supervisor in this T-shaped three-level inverter in filter in this T-shaped three-level inverter is flow through, just refer to the electric current of a point, namely flow through the electric current of inductance L 1, certainly, the filter in T-shaped three-level inverter can also adopt other forms of filter.
Suppose that T-shaped three-level inverter is operated in positive half period, namely electric current flows to the filter this T-shaped three-level inverter from a point, and now, the switching device in switch element Q1, Q2, Q3 and Q4 all turns off, electric current flows through the diode in switch element Q4, and the current potential of a point is negative busbar voltage-U bUS, the diode current flow in switch element Q3, the voltage difference U between a, b 2 abvoltage difference U between=-0.7V, b, c 2 bc=-U bUS.When the deblocking wave method deblocking ripple adopting the embodiment of the present invention to provide, switching device in switching device in switch element Q2 and switch element Q3 is open-minded, diode in switch element Q4 is subject to reverse voltage and turns off, electric current can flow to filter from the diode in the switching device switch element Q2 and switch element Q3, therefore, the voltage of a point is by negative busbar voltage-U bUSjump to the voltage of neutral point N, the voltage difference U between c, b at 2 cbvoltage difference U between=0.3V, b, a 2 ba=0.7V.And turning off the logical auxiliary pipe of non-length, after the switching device namely in switch element Q3, electric current still can flow to filter from the diode in the switching device switch element Q2 and switch element Q3, and therefore, the voltage of a point remains the voltage of neutral point N.And when the switching device in switch element Q1 and the switching device in switch element Q4 open-minded, and, after switching device in switching device in switching device in switch element Q1, switch element Q2, the switching device in switch element Q3 and switch element Q4 all receives corresponding drive singal, switching device in switch element Q1 is open-minded, and the voltage of a point is positive direct-current busbar voltage+U by the voltage jump of neutral point N bUS, due to U c+ U bc+ U ab=U a, therefore U ab=U ac-U bc=+U bUS-U bc, because the voltage on the junction capacitance Cp_Q2 of switch element Q2 can not be undergone mutation, therefore U ab=+U bUS-U bc=+U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q3 of switch element Q3 can reach half of busbar voltage.
Suppose that T-shaped three-level inverter is operated in negative half-cycle, namely electric current flows to a point from the filter this T-shaped three-level inverter, and now, the switching device in switch element Q1, Q2, Q3 and Q4 all turns off, electric current flows through the diode in switch element Q1, and the current potential of a point is positive bus-bar voltage+U bUS, the diode current flow in switch element Q2, the voltage difference U between b, c 2 bcvoltage difference U between=0.7, a, b 2 ab=+U bUS.When the deblocking wave method deblocking ripple adopting the embodiment of the present invention to provide, switching device in switching device in switch element Q2 and switch element Q3 is open-minded, diode in switch element Q1 is subject to reverse voltage and turns off, electric current can flow to filter from the diode in the switching device switch element Q2 and switch element Q3, therefore, the current potential of a point is by positive bus-bar voltage+U bUSsaltus step is the voltage of neutral point N, the voltage difference U between b, c 2 bcvoltage difference U between=0.7V, a, b 2 ab=0.3V.And turning off the logical auxiliary pipe of non-length, after the switching device namely in switch element Q2, electric current still can flow to filter from the diode in the switching device switch element Q3 and switch element Q2, and therefore, the voltage of a point remains the voltage of neutral point N.And when the switching device in switch element Q1 and the switching device in switch element Q4 open-minded, and, after switching device in switching device in switching device in switch element Q1, switch element Q2, the switching device in switch element Q3 and switch element Q4 all receives corresponding drive singal, switching device in switch element Q4 is open-minded, and the voltage of a point is positive direct-current busbar voltage-U by the voltage jump of neutral point N bUS, due to U c+ U bc+ U ab=U a, therefore U ab=U ac-U bc=-U bUS-U bc, because the voltage on the junction capacitance Cp_Q2 of switch element Q2 can not be undergone mutation, therefore U ab=-U bUS-U bc=-U bUS, that is, the instantaneous voltage on the junction capacitance Cp_Q3 of switch element Q3 can reach half of busbar voltage.
Due to, slightly larger than half of busbar voltage therefore the maximum voltage that in T-shaped three-level inverter, auxiliary pipe can bear is generally, adopt the deblocking wave method that provides of the embodiment of the present invention to T-shaped plug receive electrical level inverter carry out deblocking ripple time, can to ensure in this T-shaped three-level inverter that the instantaneous voltage born of auxiliary pipe can not be greater than its maximum voltage that can bear overcomes owing to bearing voltage excessive, causes the problem that the auxiliary pipe in T-shaped three-level inverter damages.
The envelope wave method that the embodiment of the present invention provides and deblocking wave method, both can be used alone, also can be with the use of.The envelope wave method provided when only using the embodiment of the present invention, can overcome the problem of the auxiliary pipe in the T-shaped three-level inverter of damage that existing envelope wave method causes; The deblocking wave method provided when only using the embodiment of the present invention, can overcome the problem of the auxiliary pipe in the T-shaped three-level inverter of damage that existing deblocking wave method causes; If the envelope wave method that the embodiment of the present invention is provided and deblocking wave method with the use of, then can overcome the problem of the auxiliary pipe in the T-shaped three-level inverter of damage that existing envelope wave method and deblocking wave method cause.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of envelope ripple-deblocking wave apparatus, deblocking wave apparatus and control circuit, the principle of dealing with problems due to these devices and control circuit is similar with deblocking wave method to aforementioned envelope ripple-deblocking wave method, therefore the enforcement of this device and control circuit see the enforcement of preceding method, can repeat part and repeats no more.
One envelope ripple-deblocking wave apparatus that the embodiment of the present invention provides, as shown in Figure 5, comprising:
First detection module 51, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
First control module 52, for be greater than first threshold at the electric current detected and described T-shaped three-level inverter is in deblocking wavy state time, no longer the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
Further, first control module 52 also for, when the electric current detected is not more than Second Threshold and described T-shaped three-level inverter is in the wavy state of envelope, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the second preset duration, and after the second preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 3rd preset duration, and after the 3rd preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
The embodiment of the present invention also provides a kind of deblocking wave apparatus, as shown in Figure 6, comprising:
Second detection module 61, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
Second control module 62, for be not more than the 3rd threshold value at the electric current detected and described T-shaped three-level inverter be in envelope wavy state time, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal of the supervisor exported in described T-shaped three-level inverter by described ripple unit is transferred to described supervisor, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
A kind of inverter circuit that the embodiment of the present invention provides, when this inverter circuit is single-phase inversion circuit, as shown in Figure 7, specifically comprise a T-shaped three-level inverter 71, send out ripple unit 72, control unit 73, one is detected judging unit 74, send out ripple unit 72 connection control unit 73, the control end of supervisor in control unit 73 difference connecting T-shaped three-level inverter 71 and the control end of auxiliary pipe, i.e. Q1, Q2, the control end of the switching device in Q3 and Q4, with the supervisor in T-shaped three-level inverter 71 in filter 75 in detection judging unit 74 connecting T-shaped three-level inverter 71, namely one end that the switching device in Q1 is connected with the switching device in Q4, that is, detect a point in judging unit 74 connecting T-shaped three-level inverter 71,
Detect judging unit 74, for detecting the electric current that one end of being connected with the supervisor in T-shaped three-level inverter 71 in the filter 75 in the T-shaped three-level inverter 71 that is connected with self is flow through, and when the electric current detected is greater than first threshold and T-shaped three-level inverter 71 is in the wavy state of deblocking, send the first notification signal to control unit 73;
Control unit 73, for after receiving the first notification signal of Autonomous test judging unit 74, no longer the drive singal sending out ripple unit 72 and export to the supervisor detected in the T-shaped three-level inverter 71 that connects of judging unit 74 is transferred to supervisor, and turn off supervisor, and wait for the first preset duration, and after the first preset duration terminates, no longer the drive singal sending out ripple unit 72 and export to the auxiliary pipe detected in the T-shaped three-level inverter 71 that connects of judging unit 74 is transferred to auxiliary pipe, and turns off auxiliary pipe.
Further, detect judging unit 74, also for detect in T-shaped three-level inverter 71 be responsible for electric current one end of being connected flow through be not more than Second Threshold and T-shaped three-level inverter 71 be in seal wavy state time, send the second notification signal to control unit 73;
Control unit 73, also for after receiving the second notification signal of Autonomous test judging unit 74, the auxiliary pipe controlling to detect in the T-shaped three-level inverter 71 of judging unit 74 connection is open-minded, and wait for the second preset duration, and after the second preset duration terminates, the auxiliary pipe that non-length in T-shaped three-level inverter 71 is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 3rd preset duration, and after the 3rd preset duration terminates, supervisor in the T-shaped three-level inverter 71 connect detection judging unit 74 is open-minded, and the drive singal sending out the supervisor that ripple unit 72 is exported in T-shaped three-level inverter 71 is transferred to supervisor, and the drive singal sending out the auxiliary pipe that ripple unit 72 is exported in T-shaped three-level inverter 71 is transferred to auxiliary pipe, the zero cross signal of voltage is the zero cross signal of the voltage detecting the one end be connected with supervisor in the filter 75 in the T-shaped three-level inverter 71 of judging unit 74 connection.
In the inverter circuit shown in Fig. 7, can adopt and detect the zero cross signal that judging unit detects voltage.
When inverter circuit is three-phase inverting circuit, as shown in Figure 8, specifically comprise a T-shaped three-level inverter 81_A, a T-shaped three-level inverter 81_B, a T-shaped three-level inverter 81_C, send out ripple unit 82, control unit 83, one is detected judging unit 84_A, one is detected judging unit 84_B, one is detected judging unit 84_C, send out ripple unit 82 connection control unit 83, the control end of supervisor in control unit 83 difference connecting T-shaped three-level inverter 81_A and the control end of auxiliary pipe, the control end of the supervisor in T-shaped three-level inverter 81_B and the control end of auxiliary pipe, the control end of the supervisor in T-shaped three-level inverter 81_C and the control end of auxiliary pipe, detect the one end be connected with the supervisor in T-shaped three-level inverter 81_A in the filter 85_A in judging unit 84_A connecting T-shaped three-level inverter 81_A, that is, detect a point in judging unit 84_A connecting T-shaped three-level inverter 81_A, detect the one end be connected with the supervisor in T-shaped three-level inverter 81_B in the filter 85_B in judging unit 84_B connecting T-shaped three-level inverter 81_B, that is, detect a point in judging unit 84_B connecting T-shaped three-level inverter 81_B, detect the one end be connected with the supervisor in T-shaped three-level inverter 81_C in the filter 85_C in judging unit 84_C connecting T-shaped three-level inverter 81_C, that is, detect a point in judging unit 84_C connecting T-shaped three-level inverter 81_C.
The working method of each detection judging unit is identical with the working method of the detection judging unit in single-phase inversion circuit, does not repeat them here.The result that control unit detects according to each detection judging unit, carries out envelope ripple or deblocking ripple to the mutually T-shaped three-level inverter that this detection judging unit connects.Control unit carries out envelope ripple mode to each mutually T-shaped three-level inverter, identical with the mode that control unit in single-phase inversion circuit carries out sealing ripple to T-shaped three-level inverter, does not repeat them here; Control unit carries out deblocking ripple mode to each mutually T-shaped three-level inverter, identical with the mode that control unit in single-phase inversion circuit carries out deblocking ripple to T-shaped three-level inverter, does not repeat them here.
Due to, Metal-oxide-semicondutor field effect transistor (MOSFET, Metal-Oxide-SemiconductorField Effect Transistor) when small area analysis, relative to insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor) conduction loss is less, switching loss is lower, but expensive; And IGBT is little at big current occasion conduction loss, little relative to switching loss MOSFET, but price is lower.And the switching loss of supervisor in T-shaped three-level inverter and conduction loss all very large, therefore, adopt MOSFET, and the switching loss of the auxiliary pipe in T-shaped three-level inverter can think 0, and when the load that it connects is resistive load, much less than the conduction loss of supervisor of the conduction loss of auxiliary pipe, therefore, auxiliary pipe can adopt IGBT, to realize the best price/performance ratio of T-shaped three-level inverter.
Therefore, when the inverter circuit that the embodiment of the present invention provides is single-phase inversion circuit, as illustrated in fig. 9, the supervisor in the T-shaped three-level inverter in this inverter circuit is MOSFET, and the auxiliary pipe in the T-shaped three-level inverter in this inverter circuit is IGBT.Corresponding component in the inverter circuit shown in other parts with Fig. 7 in inverter circuit shown in Fig. 9 a is identical, annexation between all parts in inverter circuit shown in Fig. 9 a is identical with the annexation between the corresponding component in the inverter circuit shown in Fig. 7, and the operation principle of the inverter circuit shown in Fig. 9 a is identical with the operation principle of the inverter circuit shown in Fig. 7.
When the inverter circuit that the embodiment of the present invention provides is three-phase inverting circuit, as shown in figure 9b, supervisor in the T-shaped three-level inverter of each phase in this inverter circuit is MOSFET, and the auxiliary pipe in the T-shaped three-level inverter of each phase in this inverter circuit is IGBT.Corresponding component in the inverter circuit shown in other parts with Fig. 8 in inverter circuit shown in Fig. 9 b is identical, annexation between all parts in inverter circuit shown in Fig. 9 b is identical with the annexation between the corresponding component in the inverter circuit shown in Fig. 8, and the operation principle of the inverter circuit shown in Fig. 9 b is identical with the operation principle of the inverter circuit shown in Fig. 8.
Another inverter circuit that the embodiment of the present invention provides, when this inverter circuit is single-phase inversion circuit, as shown in Figure 7, specifically comprise a T-shaped three-level inverter 71, send out ripple unit 72, control unit 73, one is detected judging unit 74, send out ripple unit 72 connection control unit 73, the control end of supervisor in control unit 73 difference connecting T-shaped three-level inverter 71 and the control end of auxiliary pipe, i.e. Q1, Q2, the control end of the switching device in Q3 and Q4, with the supervisor in T-shaped three-level inverter 71 in filter 75 in detection judging unit 74 connecting T-shaped three-level inverter 71, namely one end that the switching device in Q1 is connected with the switching device in Q4, that is, detect a point in judging unit 74 connecting T-shaped three-level inverter 71,
Detect judging unit 74, for detecting the electric current that one end of being connected with the supervisor in T-shaped three-level inverter 71 in the filter 75 in the T-shaped three-level inverter 71 that is connected with self is flow through, detect in T-shaped three-level inverter 71 be responsible for electric current one end of being connected flow through be not more than the 3rd threshold value and T-shaped three-level inverter 71 be in seal wavy state time, send third notice signal to control unit 73;
Control unit 73, also for after receiving the third notice signal of Autonomous test judging unit 74, the auxiliary pipe controlling to detect in the T-shaped three-level inverter 71 of judging unit 74 connection is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in T-shaped three-level inverter 71 is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, supervisor in the T-shaped three-level inverter 71 connect detection judging unit 74 is open-minded, and the drive singal sending out the supervisor that ripple unit 72 is exported in T-shaped three-level inverter 71 is transferred to supervisor, and the drive singal sending out the auxiliary pipe that ripple unit 72 is exported in T-shaped three-level inverter 71 is transferred to auxiliary pipe, the zero cross signal of voltage is the zero cross signal of the voltage detecting the one end be connected with supervisor in the filter 75 in the T-shaped three-level inverter 71 of judging unit 74 connection.
When inverter circuit is three-phase inverting circuit, the structure of the inverter circuit shown in its structure with Fig. 8 is identical.The working method of each detection judging unit is identical with the working method of the detection judging unit in single-phase inversion circuit, does not repeat them here.The result that control unit detects according to each detection judging unit, carries out envelope ripple or deblocking ripple to the mutually T-shaped three-level inverter that this detection judging unit connects.Control unit carries out envelope ripple mode to each mutually T-shaped three-level inverter, identical with the mode that control unit in single-phase inversion circuit carries out sealing ripple to T-shaped three-level inverter, does not repeat them here; Control unit carries out deblocking ripple mode to each mutually T-shaped three-level inverter, identical with the mode that control unit in single-phase inversion circuit carries out deblocking ripple to T-shaped three-level inverter, does not repeat them here.
Further, when the inverter circuit that the embodiment of the present invention provides is single-phase inversion circuit, supervisor in T-shaped three-level inverter in this inverter circuit is MOSFET, auxiliary pipe in T-shaped three-level inverter in this inverter circuit is IGBT, and the structure of this single-phase inversion circuit is identical with the structure of the inverter circuit shown in Fig. 9 a.When the inverter circuit that the embodiment of the present invention provides is three-phase inverting circuit, supervisor in the T-shaped three-level inverter of each phase in this inverter circuit is MOSFET, auxiliary pipe in the T-shaped three-level inverter of each phase in this inverter circuit is IGBT, and the structure of this three-phase inverting circuit is identical with the structure of the inverter circuit shown in Fig. 9 b.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (11)

1. seal ripple-deblocking wave method, it is characterized in that, comprising:
Detect the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
When the electric current detected is greater than first threshold and described T-shaped three-level inverter is in the wavy state of deblocking, no longer the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
2. the method for claim 1, is characterized in that, described method also comprises:
When the electric current detected is not more than Second Threshold and described T-shaped three-level inverter is in the wavy state of envelope, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the second preset duration, and after the second preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 3rd preset duration, and after the 3rd preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
3. seal ripple-deblocking wave apparatus, it is characterized in that, comprising:
First detection module, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
First control module, for be greater than first threshold at the electric current detected and described T-shaped three-level inverter is in deblocking wavy state time, no longer the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported in described T-shaped three-level inverter by described ripple unit is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
4. device as claimed in claim 3, is characterized in that, described first control module also for:
When the electric current detected is not more than Second Threshold and described T-shaped three-level inverter is in the wavy state of envelope, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the second preset duration, and after the second preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 3rd preset duration, and after the 3rd preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
5. a deblocking wave method, is characterized in that, comprising:
Detect the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
When the electric current detected is not more than the 3rd threshold value and described T-shaped three-level inverter is in the wavy state of envelope, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal of the supervisor exported in described T-shaped three-level inverter by described ripple unit is transferred to described supervisor, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
6. a deblocking wave apparatus, is characterized in that, comprising:
Second detection module, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in a T-shaped three-level inverter is flow through;
Second control module, for be not more than the 3rd threshold value at the electric current detected and described T-shaped three-level inverter be in envelope wavy state time, the auxiliary pipe controlled in described T-shaped three-level inverter is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, by open-minded for the supervisor in described T-shaped three-level inverter, and the drive singal of the supervisor exported in described T-shaped three-level inverter by described ripple unit is transferred to described supervisor, the zero cross signal of described voltage is the zero cross signal of the voltage of the one end be connected with the supervisor in described T-shaped three-level inverter in the filter in described T-shaped three-level inverter.
7. an inverter circuit, comprises at least one T-shaped three-level inverter, sends out ripple unit, it is characterized in that, also comprises control unit and at least one detection judging unit; Described ripple unit connection control unit, described control unit connects the control end of the supervisor in each T-shaped three-level inverter and the control end of auxiliary pipe respectively, and each detection judging unit connects the one end be connected with supervisor in the filter in a T-shaped three-level inverter;
Each detection judging unit, for detect in the filter in the T-shaped three-level inverter that is connected with self with the electric current be responsible for one end of being connected and flow through, and when detecting that described electric current is greater than first threshold and described T-shaped three-level inverter is in the wavy state of deblocking, send the first notification signal to control unit;
Described control unit, for after receiving the first notification signal of Autonomous test judging unit, the drive singal of the supervisor no longer exported to by a ripple unit in the T-shaped three-level inverter of described detection judging unit connection is transferred to described supervisor, and turn off described supervisor, and wait for the first preset duration, and after the first preset duration terminates, the drive singal of the auxiliary pipe no longer exported to by a ripple unit in the T-shaped three-level inverter of described detection judging unit connection is transferred to described auxiliary pipe, and turns off described auxiliary pipe.
8. inverter circuit as claimed in claim 7, it is characterized in that, each detection judging unit, also for detect in described T-shaped three-level inverter be responsible for electric current one end of being connected flow through be not more than Second Threshold and described T-shaped three-level inverter be in seal wavy state time, send the second notification signal to control unit;
Described control unit, also for after receiving the second notification signal of Autonomous test judging unit, the auxiliary pipe controlled in the T-shaped three-level inverter of described detection judging unit connection is open-minded, and wait for the second preset duration, and after the second preset duration terminates, the auxiliary pipe that non-length in described T-shaped three-level inverter is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 3rd preset duration, and after the 3rd preset duration terminates, supervisor in the T-shaped three-level inverter connect described detection judging unit is open-minded, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage be in the filter in the T-shaped three-level inverter that connects of described detection judging unit with the zero cross signal of voltage being responsible for the one end be connected.
9. inverter circuit as claimed in claim 7, it is characterized in that, supervisor in T-shaped three-level inverter in described inverter circuit is Metal-oxide-semicondutor field effect transistor MOSFET, and the auxiliary pipe in the T-shaped three-level inverter in described inverter circuit is insulated gate bipolar transistor IGBT.
10. an inverter circuit, comprises at least one T-shaped three-level inverter, sends out ripple unit, it is characterized in that, also comprises control unit and at least one detection judging unit; Described ripple unit connection control unit, described control unit connects the control end of the supervisor in each T-shaped three-level inverter and the control end of auxiliary pipe respectively, and each detection judging unit connects the one end be connected with supervisor in the filter in a T-shaped three-level inverter;
Each detection judging unit, for detecting the electric current that one end of being connected with the supervisor in described T-shaped three-level inverter in the filter in the T-shaped three-level inverter that is connected with self is flow through, and when detecting that described electric current is not more than the 3rd threshold value and described T-shaped three-level inverter is in the wavy state of envelope, send third notice signal to control unit;
Described control unit, for after receiving the third notice signal of Autonomous test judging unit, the auxiliary pipe controlled in the T-shaped three-level inverter of described detection judging unit connection is open-minded, and wait for the 4th preset duration, and after the 4th preset duration terminates, the auxiliary pipe that in described T-shaped three-level inverter, non-length is logical is determined according to the zero cross signal of voltage, and the auxiliary pipe that the non-length that shutoff is determined is led to, and wait for the 5th preset duration, and after the 5th preset duration terminates, supervisor in the T-shaped three-level inverter connect described detection judging unit is open-minded, and the drive singal sending out the supervisor that ripple unit is exported in described T-shaped three-level inverter is transferred to described supervisor, and the drive singal sending out the auxiliary pipe that ripple unit is exported in described T-shaped three-level inverter is transferred to described auxiliary pipe, the zero cross signal of described voltage is connect the zero cross signal comprising the voltage of one end of the switch element of supervisor in the filter in the T-shaped three-level inverter that connects of described detection judging unit.
11. inverter circuits as claimed in claim 10, it is characterized in that, supervisor in T three-level inverter in described inverter circuit is Metal-oxide-semicondutor field effect transistor MOSFET, and the auxiliary pipe in the T-shaped three-level inverter in described inverter circuit is insulated gate bipolar transistor IGBT.
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CN103944148A (en) * 2014-04-17 2014-07-23 华为技术有限公司 T-type three-level inverter protecting method and device and inverter circuit
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CN106230292B (en) * 2016-08-17 2019-02-01 阳光电源股份有限公司 A kind of pwm pulse of three-level inverter puts wave method and controller
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CN110649831A (en) * 2019-05-10 2020-01-03 阳光电源股份有限公司 Shutdown wave-sealing control method of multi-level inverter circuit and application device thereof
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WO2024108910A1 (en) * 2022-11-24 2024-05-30 阳光电源股份有限公司 Igct converter, power supply system, and overcurrent protection method

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