CN101179255B - H-bridge inverter of AC motor - Google Patents
H-bridge inverter of AC motor Download PDFInfo
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- CN101179255B CN101179255B CN200610143507A CN200610143507A CN101179255B CN 101179255 B CN101179255 B CN 101179255B CN 200610143507 A CN200610143507 A CN 200610143507A CN 200610143507 A CN200610143507 A CN 200610143507A CN 101179255 B CN101179255 B CN 101179255B
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Abstract
The invention discloses an H-bridge inverter which is applied to an alternating current motor and outputs an output voltage of a power cell by allowing a cell controller compensating the power cell with an input voltage even if the input voltage changes. Users can select an operation mode of every cell controller as a compensation mode which is applicable for the input voltage and as an output voltage control mode according to simple instruction frequency. The cell controller provides a compensation control function for changes of the input voltage, thereby reducing communication loads between a main controller and a cell controller.
Description
Technical field
The present invention relates to a kind of drive controlling of alternating current motor, this motor is used as industrial the powerful device for example driving power and the high-tension power supply of needs of pump, fan, compressor, blender and conveyer.
Especially, the present invention relates to a kind of high-voltage inverter, it has 2 kilovolts (KV) output voltage to 5KV, and relate in particular to a kind of high-voltage inverter, it can obtain high output voltage by whenever being in series in the three-phase of a plurality of low-voltage inverters (inverter that for example, has 200V or 400V output voltage) connected.
More particularly, the present invention relates to a kind of contrary device system of handing over, it can be by the control that distributes of cell controller and master controller, and wherein this cell controller single control and master controller of being used for each power cell is used to control these cell controllers.
More particularly, the present invention relates to a kind of high-voltage inverter system, wherein output voltage is not subjected to the influence that each power cell input voltage changes.
More particularly, the present invention relates to a kind of high-voltage inverter system, wherein cell controller can not rely on master controller just can prevent that output voltage is subjected to the influence that the input voltage of each power cell changes.
More particularly, the present invention relates to a kind of high-voltage inverter system, its use is used for the serial communication that communicates between master controller and a plurality of cell controller, especially specifically use controller zone network (CAN) communication.
Background technology
H bridge inverter system is an a kind of high-voltage inverter system, and it comprises the single power supply of each power cell, with to each power cell supplying DC power source.
Transformer is used for single power supply.Rectifier and capacitor are used for and will be converted to the semiconductor switch that therefore direct current also offers direct current power cell by the alternating current that transformer provided.Can detect from the two ends of capacitor by the rectification of rectifier institute and by capacitor level and smooth voltage, simultaneously as the input voltage of power cell.This voltage is exactly so-called DC chain voltage in the prior art.
But the DC chain voltage of each power cell may change owing to the input ac power of transformer that is the change in voltage of business exchange power supply.This does not allow the required output voltage of inverter output AC motor.
And then some DC chain voltages that are used for power cell may be different from other the DC chain voltage that is used for power cell owing to the single electric capacity difference of the secondary output voltage error of the percentage impedance drop of transformer that is transformer or capacitor.Therefore, between the output voltage of the every phase of inverter imbalance can take place.This can cause the overvoltage of the semiconductor switch of specific phase at regeneration period, can burn corresponding semiconductor switch thus.
In order to address the above problem, power cell can be connected to circuit-breaker, so that this circuit-breaker can be threaded off with the protection power cell when overvoltage occurs.
Yet, problem still can take place, reason is if threaded off with the circuit-breaker that mutually a power cell connects, and the voltage that then is applied on the power cell of other phase increases, and the operation of the load device such as motor may stop along with the operation of inverter and stop.
Summary of the invention
Therefore, the purpose of this invention is to provide the H bridge inverter that is used for alternating current motor, wherein the last output voltage of the output voltage of power cell and inverter even is not used for the concentrated variation of DC chain voltage of a plurality of power cells or the influence of single variation.
Another object of the present invention provides the H bridge inverter that is used for alternating current motor, wherein a plurality of cell controllers rather than master controller can be controlled each power cell so that be not subjected to the power cell output voltage influence, thereby reduce the calculated load and the communication load of master controller.
In order to obtain these and other advantage and corresponding with purpose of the present invention, as here specifically present and general description, a kind of H bridge inverter that is used for alternating current motor is provided, it comprises: the power cell that a plurality of every three-phases are connected in series, its each have semiconductor switch, rectification circuit and smmothing capacitor, semiconductor switch can switching controls, and rectification circuit and smmothing capacitor are used for DC chain voltage is offered semiconductor switch as input voltage; Phase-shifting transformer, it has primary coil and a plurality of secondary coil, and secondary coil is connected to each power cell to supply single three-phase alternating-current supply; Master controller is used for providing the output frequency command signal according to predetermined speed instruction, and this output frequency command signal is represented the output frequency of inverter; A plurality of cell controllers, it can be connected communicatedly with master controller and each provides corresponding in the power cell each, the ratio that is used for comparing to determine the input voltage of each power cell and output voltage with the predetermined rated frequency of alternating current motor according to the output frequency command signal of coming autonomous controller is as instructing the ratio of frequency, be used for producing reference voltage according to the rated voltage of alternating current motor, be used for according to calculating bucking voltage about the input voltage of the difference between the DC chain voltage of reference voltage and detection and the ratio of output voltage, the bucking voltage that is used for being calculated compensates to reference voltage, and is used for producing the pulse-width signal that has according to the determined pulse duration of reference voltage of compensation with the switching of the semiconductor switch of power controlling unit; And be connected network between master controller and the cell controller, be used between master controller and cell controller, providing communication path.
In conjunction with the accompanying drawings, more apparent the description that aforementioned and other purpose of the present invention, feature, aspect and advantage are will be below the present invention detailed.
Description of drawings
Comprised in order to the further the present invention of understanding and in being included in as the annexed drawings set forth of this specification part embodiments of the invention and describe with this and be used from and explain principle of the present invention.
In the accompanying drawings:
Fig. 1 shows the block diagram according to the total of the H bridge inverter that is used for alternating current motor of the present invention;
Fig. 2 shows according to the master controller of the H bridge inverter that is used for alternating current motor of the present invention and the block diagram of the communication between the cell controller;
Fig. 3 shows the block diagram of detailed structure of the cell controller of the H bridge inverter that is used for alternating current motor according to an embodiment of the invention;
Fig. 4 shows the block diagram of detailed structure of the cell controller of the H bridge inverter that is used for alternating current motor in accordance with another embodiment of the present invention;
Fig. 5 shows the oscillogram of the method for the pulse duration that is used for modulating the pulse-duration modulation signal generator that the cell controller that is used for the H bridge inverter of alternating current motor according to the present invention comprises;
Fig. 6 shows the flow chart of operation of the cell controller of the H bridge inverter that is used for alternating current motor according to an embodiment of the invention; And
Fig. 7 shows the flow chart of operation of the cell controller of the H bridge inverter that is used for alternating current motor in accordance with another embodiment of the present invention.
Embodiment
In detail with reference to the preferred embodiments of the present invention, its example is shown in the drawings now.
Fig. 1 shows the block diagram according to the total of the H bridge inverter that is used for alternating current motor of the present invention.
As shown in Figure 1, the H bridge inverter that is used for alternating current motor according to the present invention comprises phase-shifting transformer 71.
Phase-shifting transformer 71 comprises primary coil 71A and a plurality of secondary coil 71B1～71Bn.Primary coil 71A by receive the three-phase AC power supplies for example the three-phase triangle coil of AC220V and frequency 60Hz form.Secondary coil 71B1～71Bn for example becomes the voltage transitions of the AC220V of primary coil 71A 24V and 24V is offered among power cell U1～Un, V1～Vn, the W1～Wn each, and is formed by the triangle coil.TAB is the centre cap between primary coil 71A and secondary coil 71B1～71Bn.
U phase power cell U1～Un, V phase power cell V1～Vn and the W phase power cell W1～Wn connection that whenever is in series is so that the output voltage summation of the power cell that connects of will whenever being in series offers the output voltage of alternating current motor 73 as each corresponding phase U, V and W.As mentioned above, alternating current motor 73 is used as for example driving power of pump, fan, compressor, blender and conveyer of industrial powerful device, and needs the high voltage source of 2KV to 5KV.
Shown in the frame of broken lines of Fig. 1, the amplification internal structure that shows n power cell Wn of W phase is used as the example of power cell U1～Un, V1～Vn, W1～Wn, comprise rectification circuit CON and capacitor C according to each power cell U1～Un, V1～Vn of the present invention, W1～Wn, wherein rectification circuit CON is a direct current with any one rectification in the three-phase alternating current among secondary coil 71B1～71Bn, and the feasible direct current by the rectification of rectification circuit CON institute of capacitor C smoothly and with level and smooth direct current offers semiconductor switch SW.The voltage that passes capacitor C provides the voltage to power cell U1～Un, V1～Vn, W1～Wn, provides the input voltage to the semiconductor switch SW among power cell U1～Un, V1～Vn, the W1～Wn in detail.Hereinafter, this voltage is called DC chain voltage.
For example, semiconductor switch SW for example is meant igbt (IGBT) or thyristor (SCR), and it can open or close by the output signal of the pulse-duration modulation signal generator in gate drive signal that is the inverter of the present invention.
Each power cell U1～Un, V1～Vn, W1～Wn are the low pressure inverters, and being used for by the DC chain voltage transitions with input voltage that is capacitor C is that alternating voltage drives alternating current motor 73.
In order to control each power cell U1～Un, V1～Vn, W1～Wn, the number of cell controller U1CC1～UnCCn, V1CC1～VnCCn, W1CC1～WnCCn is corresponding to the number of power cell U1～Un, V1～Vn, W1～Wn, and cell controller is connected respectively to power cell U1～Un, V1～Vn, W1～Wn.
As shown in Figure 2, the communication between master controller 72 and cell controller U1CC1～UnCCn, V1CC1～VnCCn, the W1CC1～WnCCn realizes by communication network N.Preferably, the example of communication network N comprises the fiber optic cables with rapid data transmission speed and good noise sound insulation property.
And then the communication network between master controller 72 and cell controller U1CC1～UnCCn, V1CC1～VnCCn, the W1CC1～WnCCn uses at the controller zone network (CAN) that has excellent properties aspect rapid data transmission and the noise sound insulation.
With reference to figure 2, represent to make the CAN communication in the master controller 72 to become possible structure in the CAN module shown in the master controller 72.Equally, in Fig. 2, the communication network N that extends to master controller 72 comprises the optical connector of the usefulness insulator-coating on the optical fiber.Except said structure, the CAN driver can be connected to the outside of master controller 72 and cell controller U1CC1～UnCCn, V1CC1～VnCCn, W1CC1～WnCCn discretely so that can communicate by letter by communication network N between the CAN driver.
Meanwhile, the block diagram that illustrates according to the detailed structure of the cell controller of the H bridge inverter that is used for alternating current motor of the present invention will be described with reference to Figure 3.
Because identical according to cell controller of the present invention structure each other, the therefore first module controller U1CC1 that describes in detail among the U facies unit controller U1CC1～UnCCn that is connected in series with reference to figure 3.
Compare with the predetermined rated frequency of alternating current motor 73, according to the output frequency command signal of master controller 72 (referring to Fig. 1), cell controller U1CC1 is defined as instructing frequency ratio with the ratio of the output voltage of power cell U1 (referring to Fig. 1) and input voltage.In other words, if the rated frequency of this alternating current motor is 60Hz and is 30Hz according to the instruction frequency of output frequency command signal that then cell controller U1CC1 is defined as 50% with the ratio of output voltage and input voltage.
Cell controller U1CC1 produces reference voltage according to the rated voltage of alternating current motor 73.For example, if the rated voltage of alternating current motor is 200V, then cell controller U1CC1 calculates 20V according to 10% of 200V and is used as reference voltage level and with the storage of this value that calculates within it.In this case, be scheduled to and stored 10% ratio.
Poor about between the DC chain voltage of reference voltage and detection, according to the ratio of output voltage and input voltage, cell controller U1CC1 calculates bucking voltage, and the bucking voltage about reference voltage calculated of compensation.For example, because reference voltage is 20V,, and multiply by the resulting bucking voltage of voltage difference-2V by ratio 50% and be-1V input voltage and output voltage so if detected DC chain voltage is 18V, then voltage difference is 18V-20V=-2V.Cell controller U1CC1 will be added to the 19V that reference voltage 20V obtains by general-1V and be defined as new reference voltage, and wherein the variation of input voltage has been compensated.In other words, if the input voltage of power cell that is DC chain voltage reduce, then reference voltage reduces, and vice versa.Although it is as described below, the rising of reference voltage can reduce the pulse duration of the pulse-width signal of the semiconductor switch SW that is used for the driving power unit, so that reduce the opening time of semiconductor switch, the voltage that is provided to alternating current motor from power cell can reduce whereby.On the other hand, the reduction of reference voltage has increased the pulse duration of the pulse-width signal of the semiconductor switch SW that is used for the driving power unit, so that increase the opening time of semiconductor switch, the voltage that is provided to alternating current motor from power cell can increase whereby.
And then cell controller U1CC1 produces the pulse-width signal have according to the determined pulse duration of compensate for reference voltage to be controlled at the switching of the semiconductor switch SW among the power cell U1.In other words, cell controller U1CC1 uses the pulsewidth of the pulse signal of the grid that offers semiconductor switch SW to determine the opening time of the semiconductor switch SW in power cell U1.As shown in Figure 5, by the time interval between two dotted lines that is more than or equal to time interval of the triangular carrier with 200V peak value of 100V reference voltage, determine pulse duration.Output signal with high level rectangle output waveform outputs to the grid of the semiconductor switch SW among power cell U1 from cell controller U1CC1 in this time interval.Unlike example shown in Figure 5, if compensate for reference voltage is 19V, then the peak value of triangular carrier can be 20V.The voltage of reference voltage is come out as such magnitude of voltage by calculated in advance, it has according to the predetermined ratio of load voltage value that is connected to the alternating current motor of inverter, be conventional DC chain voltage simultaneously, that is pass through the normal charge voltage institute predetermined value of the capacitor C of Fig. 1.Therefore, reference voltage level does not change, unless capacitor C replaces with another capacitor with different capacitances and the load voltage value of alternating current motor changes.Equally, the crest voltage of triangular carrier is pre the voltage of the predetermined value bigger than reference voltage, and the triangular carrier of selecting in advance to generate the triangular carrier signal with corresponding peaks voltage produces circuit.Therefore, the crest voltage of triangular carrier circuit does not change, unless this triangular carrier produces circuit and another replacement.
In Fig. 5, for convenience of description, schematically crest voltage and the reference voltage with triangular carrier is set at 200V and 100V respectively, rather than 20V and 19V.Therefore, this and magnitude of voltage are irrelevant.
In the time interval more than or equal to the triangular carrier of the reference voltage of 19V, the output signal with high level rectangle output waveform can output to the grid of the semiconductor switch SW among power cell U1 from cell controller U1CC1.
Below description is according to the detailed structure of the cell controller U1CC1 of Fig. 3 and the operation of cell controller U1CC1.
Cell controller U1CC1 comprises output voltage computation unit 81.According to the output frequency command signal of coming autonomous controller 72 corresponding to the ratio of 50% for example 30Hz of the predetermined rated frequency of the alternating current motor 73 of for example 60Hz, output voltage computation unit 81 computations frequency ratio, and determine that the ratio about the output voltage of the power cell U1 of DC chain voltage is a calculating ratio, promptly 50%.
Cell controller U1CC1 comprises reference voltage generator 82.Reference voltage generator 82 produces reference voltage according to the predetermined rated voltage of alternating current motor.Suppose that the user imports the rated voltage of 200V in advance, 10% of reference voltage generator 82 corresponding 200V calculate 20V and the value that is calculated are stored in inside.In this case, by the producer of inverter be scheduled to 10% ratio and by input unit for example program loader in advance it is stored in the program.
Cell controller U1CC1 comprises voltage difference computing unit 83.Voltage difference between detected DC chain voltage and the reference voltage that provided from reference voltage generator is provided voltage difference computing unit 83.For example, because reference voltage is 20V, so if the DC chain voltage that is detected is 18V, then voltage difference is 18V-20V=-2V.Voltage difference computing unit 83 provides voltage difference-2V as a result of to be worth.
Cell controller U1CC1 comprises bucking voltage computing unit 84.The ratio of bucking voltage computing unit 84 by the power cell output voltage that provided by output voltage computation unit 81 and the DC chain voltage i.e. 50% voltage difference-2V that multiply by voltage difference computing unit 83 and provided is compensated voltage-1V.
Cell controller U1CC1 comprises pulse-duration modulation signal generator 86.Switching for the semiconductor switch of power controlling unit U1, pulse-duration modulation signal generator 86 produces pulse-width signal, and it has according to the determined pulse duration of 19V voltage that reference voltage obtained that compensates to the 20V of reference voltage generator 82 by the bucking voltage of general-1V.
In detail, pulse-duration modulation signal generator 86 uses opening time from the semiconductor switch SW among the power cell U1 to the pulse duration of the pulse signal of the grid supply of semiconductor switch SW that determine.Pulse duration shown in Figure 5 by the time interval between two dotted lines promptly one have more than or equal to the time interval of the triangular carrier of the crest voltage of 100V reference voltage and determined.In this time interval, the output signal with rectangle output waveform of high level outputs to the grid of the semiconductor switch SW the power cell U1 from cell controller U1CC1.Unlike example shown in Figure 5, if compensate for reference voltage is 19V, then the crest voltage of triangular carrier can be 20V.In the time interval more than or equal to the triangular carrier of 19V reference voltage, the output signal with rectangle output waveform of high level can output to the grid of the semiconductor switch SW the power cell U1 from cell controller U1CC1.
Therefore, the high level time of the pulse-width signal that sent at pulse-duration modulation signal generator 86 of power cell U1 is unlocked at interval.Like this, power cell U1 is an alternating voltage so that this alternating voltage is offered alternating current motor 73 with the inversion of DC chain voltage.
Be used for the operation of cell controller of the H bridge inverter of alternating current motor according to an embodiment of the invention with reference to figure 6 concise and to the point descriptions.
Fig. 6 shows the flow chart of operation of the cell controller of the H bridge inverter that is used for alternating current motor according to an embodiment of the invention.
In step 1, the output voltage computation unit 81 of cell controller U1CC1 is calculated according to the instruction frequency of for example 30Hz of the output frequency command signal of coming autonomous controller 72 ratio to the predetermined rated frequency of for example 60Hz of alternating current motor 73, promptly 50%, and the ratio of the output voltage of definite power cell U1 and DC chain voltage is the ratio that calculates, promptly 50%.
In step 2, the voltage difference computing unit 83 of cell controller U1CC1 calculate detected DC chain voltage and the reference voltage that provided by reference voltage generator 82 between voltage difference.For example, because reference voltage is 20V, so if detected DC chain voltage is 18V, then voltage difference is 18V-20V=-2V.Voltage difference computing unit 83 as a result of is worth voltage difference-2V.
Walk downward, in step 3, the bucking voltage computing unit 84 of cell controller U1CC1 is by promptly 50% the ratio of the output voltage of power cell and DC chain voltage is provided the voltage difference-2V that is provided by voltage difference computing unit 83 obtains-bucking voltage of 1V.
In step 4, the pulse-duration modulation signal generator 86 of cell controller U1CC1 produces new reference voltage, promptly by will by bucking voltage computing unit 84 provided-bucking voltage of 1V the 20V reference voltage that is provided by reference voltage generator 82 is provided compensated the reference voltage 19V that obtains.
Next, in step 5, the pulse-duration modulation signal generator 86 of cell controller U1CC1 produces pulse-width signal, the triangular carrier of its crest voltage by relatively having 20V and new reference voltage come output high level square wave in more than or equal to the time interval of the triangular carrier of new reference voltage, and this pulse-width signal is offered the grid of the semiconductor switch SW among the power cell U1 as drive signal.Therefore, power cell U1 outputs to alternating current motor with constant ac output voltage, and voltage changes even the input voltage of power cell U1 is the DC chain.
Meanwhile, describe the operation of the cell controller of the H bridge inverter that is used for alternating current motor in accordance with another embodiment of the present invention in detail with reference to figure 4.
Because cell controller has identical structure to each other in accordance with another embodiment of the present invention, therefore describe the first module controller U1CC1 of the U facies unit controller U1CC1～UnCCn that is connected in series in detail with reference to figure 4.
Cell controller U1CC1 and cell controller according to an embodiment of the invention different that are used for the H bridge inverter of alternating current motor in accordance with another embodiment of the present invention are that the operation of this cell controller relies on user's selection information.Therefore, cell controller U1CC1 is repeated in this description based on describing so that avoid with the difference of cell controller according to an embodiment of the invention in accordance with another embodiment of the present invention.
The selection information that depends on the user, that is input voltage compensating for variations pattern or according to the selection information of the output voltage instruction mode of simple frequency instruction, more specifically be that the user who imports during the initial value setting of inverter selects information, cell controller U1CC1 optionally carries out any in two control operations as described below.
At first, when the load voltage value of importing the alternating current motor that links to each other with inverter during the initial value setting of user at inverter and while user's selection is input voltage compensating for variations pattern, cell controller U1CC1 about calculating bucking voltage at reference voltage and DC chain differences among voltages, and compensates to reference voltage with the bucking voltage that is calculated according to the ratio of output voltage and input voltage.
For the switching of the semiconductor switch of power controlling unit U1, pulse-duration modulation signal generator produces pulse-width signal, and its pulsewidth is determined according to the reference voltage that is compensated.
Second, when the user can not the alternating current motor that input links to each other with inverter during the initial value of inverter is set load voltage value or when user's selection is the output voltage instruction mode that instructs according to simple frequency, compare with the predetermined rated frequency of alternating current motor, according to the output frequency command signal of coming autonomous controller, cell controller U1CC1 determines the ratio of the ratio of the input voltage of power cell U1 and output voltage as the instruction frequency, and according to determined ratio with have dependence second reference voltage and the pulse-width signal of definite pulse duration produces second reference voltage different with first reference voltage.
Meanwhile, describe the detailed structure and the operation of cell controller in accordance with another embodiment of the present invention in detail with reference to figure 4.
Will the detailed structure and the operation of cell controller be repeated in this description so that avoid based on describing in detail in accordance with another embodiment of the present invention with the difference of cell controller according to an embodiment of the invention.
Cell controller comprises selector 85 in addition in accordance with another embodiment of the present invention, and output voltage output voltage ratio that ratio unit is provided or the bucking voltage that is provided by the bucking voltage computing unit are provided its predetermined preference pattern according to the user.
The contact 85a that is positioned at selector 85 inside is connected to the output voltage ratio that the output voltage computation unit is exported according to predetermined preference pattern, and another contact 85b of selector 85 inside is connected to the bucking voltage that the bucking voltage computing unit is exported according to predetermined preference pattern.
Preferably, the switch of selector 85 shown in Figure 4 and contact can be by being stored in the selection data among the cell controller U1CC1 and realizing according to the handling procedure of selecting data.
Included pulse-duration modulation signal generator 86 can produce pulse-width signal according to the output of selector 85 in cell controller in accordance with another embodiment of the present invention, and the pulse duration that it had is to determine according to the resulting new reference voltage of first reference voltage that compensates to reference voltage generator 82 by the bucking voltage with bucking voltage computing unit 84.Equally, pulse-duration modulation signal generator 86 can produce second reference voltage and also can produce and have according to second reference voltage and the pulse-modulated signal of definite pulse duration according to the output voltage ratio that selector 85 provided.Second reference voltage obtains by first reference voltage that the output voltage ratio be multiply by another reference voltage rather than reference voltage generator 82 is provided, wherein this another reference voltage is that detected input voltage is a DC chain voltage, and may be different owing to the capacitance difference of the change in voltage of commercial ac power source, capacitor C or the secondary voltage of each power cell in phase-shifting transformer between difference change.
The operation of the cell controller of the H bridge inverter that is used for alternating current motor in accordance with another embodiment of the present invention meanwhile, has briefly been described with reference to figure 7.
Fig. 7 shows the flow chart of operation of the cell controller of the H bridge inverter that is used for alternating current motor in accordance with another embodiment of the present invention.
Flow chart and Fig. 4 with reference to figure 7 describe the operation of the cell controller of H bridge inverter in accordance with another embodiment of the present invention.
At first, the cell controller U1CC1 of H bridge inverter checks the rated voltage whether be provided with the alternating current motor that inverter will control in accordance with another embodiment of the present invention, and promptly whether the data by the rated voltage that the user imported are stored in step 10.If the rated voltage of alternating current motor is set in step 10, then cell controller U1CC1 is from such as reading the load voltage value that sets and advance to step 11 the such data storage device (not shown) of memory.
If do not set the rated voltage of alternating current motor in step 10, then cell controller U1CC1 advances to step 12.
In step 11, it is the output voltage instruction mode of input voltage compensating for variations pattern or the simple frequency instruction of basis for user's selection of the mode of operation of cell controller U1CC1 that cell controller U1CC1 uses selector 85 inspections.
If the mode of operation of cell controller U1CC1 has been chosen as input voltage compensating for variations pattern in step 11, then cell controller U1CC1 advances to step 14.Otherwise if the mode of operation of cell controller U1CC1 has been chosen as the output voltage instruction mode according to simple frequency instruction, then cell controller U1CC1 advances to step 12.
If cell controller U1CC1 advances to step 14, then compare with the predetermined rated frequency of alternating current motor, according to the output frequency command signal of coming autonomous controller, the ratio of the output voltage computation unit 81 computations frequencies of cell controller U1CC1, and the ratio of the output voltage of definite power cell and DC chain voltage ratio as a result of.
Afterwards, cell controller U1CC1 advances to step 15, so that the rated voltage that the voltage difference computing unit 83 of cell controller U1CC1 is provided according to reference voltage generator 82 calculates the voltage difference between detected DC chain voltage and reference voltage.
Then, cell controller U1CC1 advances to step 16, so that output voltage and the ratio of DC chain voltage of the bucking voltage computing unit 84 of cell controller U1CC1 by the power cell that will be provided by output voltage computation unit 81 voltage difference that is provided from voltage difference computing unit 83 is provided is compensated voltage.
Next, cell controller U1CC1 advances to step 17, so that the pulse-duration modulation signal generator 86 of cell controller U1CC1 is by the bucking voltage that provides from bucking voltage computing unit 84 is provided to the reference voltage that provides from reference voltage generator 82, produce new reference voltage, that is compensate for reference voltage.
Next step, cell controller U1CC1 advances to step 18, so that the pulse-duration modulation signal generator of cell controller U1CC1 86 produces pulse-width signals, it exports the square wave of high level in the time interval more than or equal to the triangular carrier of new reference voltage by triangular carrier more shown in Figure 5 and new reference voltage.
Afterwards, although Fig. 7 is not shown, the grid of the semiconductor switch in the power cell is driven in the high level time interval of pulse-width signal, so that unlatching semiconductor switch, DC chain voltage from capacitor C is converted into alternating current whereby, and the output voltage of the power cell of the connection that will whenever be in series offers alternating current motor.
Meanwhile, if cell controller U1CC1 advances to step 12, then the pulse-duration modulation signal generator 86 of cell controller U1CC1 produces second reference voltage according to the output voltage ratio that selector 85 is provided.In this case, second reference voltage is that detected input voltage is a DC chain voltage, and may be different owing to the capacitance difference of the change in voltage of commercial ac power source, capacitor C or the secondary voltage of each power cell in phase-shifting transformer between difference change.Equally, if DC chain voltage less than or greater than the expectation voltage level, then the booster voltage of just (+) that is set by the user or negative (-) can be added on second reference voltage to produce the second new reference voltage.
Afterwards, cell controller U1CC1 advances to step 13 so that the pulse-duration modulation signal generator of cell controller U1CC1 86 produces pulse-width signal, its pulse duration determines according to new second reference voltage that produces, and the pulse-width signal that the produced gate drive signal as the semiconductor switch of corresponding power unit U1 is provided.
As mentioned above, advantage of the present invention is as follows.
According to the H bridge inverter that is used for alternating current motor, the last output voltage of the output voltage of power cell and inverter even can be used for the concentrated variation of DC chain voltage of power cell or the influence of single variation.
Equally, according to the H bridge inverter that is used for alternating current motor, the user can the selected cell controller be in input voltage compensating for variations pattern or according to the output voltage instruction mode of simple frequency instruction.
At last, according to the H bridge inverter that is used for alternating current motor, a plurality of cell controllers rather than single master controller can be controlled each power cell so that can not be subjected to the power cell output voltage influence, have therefore reduced the calculated load and the communication load of master controller.
When the present invention under the situation that does not break away from spirit of the present invention or substantive characteristics can specialize with several forms, be appreciated that, the foregoing description is not limited to aforementioned any details, unless otherwise indicated, explain but should in the defined spirit and scope of its claims, make widely, and therefore fall into all changes in the claim scope and the equivalent of modification or this scope is tending towards included by claims.
Claims (8)
1. H bridge inverter that is used for alternating current motor comprises:
The power cell that a plurality of every three-phases are connected in series, its each have semiconductor switch, rectification circuit and smmothing capacitor, described semiconductor switch can switching controls, and described rectification circuit and described smmothing capacitor are used for DC chain voltage is offered described semiconductor switch as input voltage;
Phase-shifting transformer, it has primary coil and a plurality of secondary coil, and described secondary coil is connected to each in the described power cell, is used to provide single three-phase alternating-current supply;
Master controller is used for providing the output frequency command signal according to predetermined speed instruction, and described output frequency command signal is represented the output frequency of described inverter;
A plurality of cell controllers, in itself and the described power cell each provides accordingly and can be connected to described master controller communicatedly, be used for comparing with the predetermined rated frequency of described alternating current motor, according to output frequency command signal from described master controller, the input voltage of determining each power cell is to the ratio of the output voltage ratio as the instruction frequency, be used for producing reference voltage according to the rated voltage of described alternating current motor, be used for DC chain voltage about described reference voltage and described detection, according to the ratio of described input voltage to output voltage, calculate bucking voltage, be used for the bucking voltage of described calculating is compensated to described reference voltage, and be used for producing the switching of pulse-width signal with pulse duration of determining according to the reference voltage of described compensation with the described semiconductor switch of controlling described power cell; And
Be connected the network between described master controller and the described cell controller, be used between described master controller and described cell controller, providing communication path.
2. the H bridge inverter that is used for alternating current motor as claimed in claim 1, wherein said cell controller comprises:
The output voltage computation unit, be used for comparing with the predetermined rated frequency of described alternating current motor, according to output frequency command signal from described master controller, the ratio of computations frequency, and be used to use the ratio of described calculating to determine the ratio of the output voltage of described power cell to described DC chain voltage;
Reference voltage generator is used for producing reference voltage according to the predetermined rated voltage of described alternating current motor;
The voltage difference computing unit, be used to calculate the DC chain voltage of described detection and the reference voltage that provides from described reference voltage generator between voltage difference;
The bucking voltage computing unit output voltage by the described power cell that will provide from described output voltage computation unit is provided the voltage difference that provides from described voltage difference computing unit is provided for the ratio of described DC chain voltage is compensated voltage; And
Pulse-duration modulation signal generator, be used to produce the pulse-width signal that has according to so determined pulse duration of reference voltage, described reference voltage obtains by the reference voltage that will compensate to from described reference voltage generator from the bucking voltage of described bucking voltage computing unit, thereby is used for controlling the switching of the described semiconductor switch of described power cell.
3. the H bridge inverter that is used for alternating current motor as claimed in claim 1, wherein said network is made up of fiber optic cables.
4. the H bridge inverter that is used for alternating current motor as claimed in claim 1 wherein, is communicated by letter by controller zone network CAN and to be carried out by the described master controller of described network and the communication between the described cell controller.
5. H bridge inverter that is used for alternating current motor comprises:
The power cell that a plurality of every three-phases are connected in series, its each have semiconductor switch, rectification circuit and smmothing capacitor, described semiconductor switch can switching controls, and described rectification circuit and described smmothing capacitor are used for DC chain voltage is offered described semiconductor switch as input voltage;
Phase-shifting transformer, it has primary coil and a plurality of secondary coil, and described secondary coil is connected to each in the described power cell, is used to provide single three-phase alternating-current supply;
Master controller is used for providing the output frequency command signal according to predetermined speed instruction, and described output frequency command signal is represented the output frequency of described inverter;
A plurality of cell controllers, it provides accordingly with described power cell and can be connected communicatedly with described master controller, be used for comparing with the predetermined rated frequency of described alternating current motor, according to output frequency command signal from described master controller, the input voltage of determining described power cell is to the ratio of the output voltage ratio as the instruction frequency, select input voltage compensating for variations pattern in advance if be used for the user, then the rated voltage according to described alternating current motor produces first reference voltage, be used for poor about between the DC chain voltage of described first reference voltage and described detection, according to the ratio of described input voltage to output voltage, calculate bucking voltage, be used for the bucking voltage of described calculating is compensated to described first reference voltage, be used to produce the pulse-width signal that has according to the determined pulse duration of first reference voltage of described compensation, perhaps, if the user selects the output voltage instruction mode according to simple frequency instruction in advance, then be used for comparing with the predetermined rated frequency of described alternating current motor, according to output frequency command signal from described master controller, the input voltage of determining described power cell is to the ratio of the output voltage ratio as the instruction frequency, be used for producing second reference voltage and generation and have pulse-width signal, thereby control the switching of the described semiconductor switch in the described power cell by the determined pulse duration of described second reference voltage according to described definite ratio; And
Be connected the network between described master controller and the described cell controller, be used between described master controller and described cell controller, providing communication path.
6. the H bridge inverter that is used for alternating current motor as claimed in claim 5, wherein said cell controller comprises:
The output voltage computation unit, be used for comparing with the predetermined rated frequency of described alternating current motor, according to output frequency command signal from described master controller, the ratio of computations frequency, and be used to use the ratio of described calculating to determine the ratio of the output voltage of described power cell to described DC chain voltage;
Reference voltage generator is used for producing first reference voltage according to the predetermined rated voltage of described alternating current motor;
The voltage difference computing unit, be used to calculate the DC chain voltage of described detection and described first reference voltage that provides from described reference voltage generator between voltage difference;
The bucking voltage computing unit output voltage by the described power cell that will provide from described output voltage computation unit is provided the voltage difference that provides from described voltage difference computing unit is provided for the ratio of DC chain voltage is compensated voltage;
Selector, being used for predetermined preference pattern according to the user provides from the output voltage ratio of described output voltage computation unit or from the bucking voltage of described bucking voltage computing unit; And
Pulse-duration modulation signal generator, be used to produce the pulse-width signal that has according to so determined pulse duration of reference voltage, described reference voltage obtains by the reference voltage that will compensate to from described reference voltage generator from the bucking voltage that described selector provides, perhaps be used for producing second reference voltage according to the output voltage ratio that provides from described selector, so that produce the pulse-width signal that has according to the determined pulse duration of described second reference voltage, thereby control the switching of the described semiconductor switch in the described power cell.
7. the H bridge inverter that is used for alternating current motor as claimed in claim 5, the medium of wherein said network is fiber optic cables.
8. the H bridge inverter that is used for alternating current motor as claimed in claim 5, wherein said network use the CAN of serial communication to communicate by letter to reduce the communication line between described master controller and the described cell controller.
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| JP5449893B2 (en) * | 2009-07-21 | 2014-03-19 | 株式会社日立製作所 | Power converter |
| KR101118376B1 (en) * | 2009-12-30 | 2012-03-09 | 엘에스산전 주식회사 | Apparatus and method for protecting overvoltage of high voltage inverter |
| CN102035402B (en) * | 2010-11-24 | 2013-01-30 | 中国船舶重工集团公司第七一二研究所 | Integrated gate-commutated thyristor (IGCT)-based hybrid cascaded H-bridge multi-level high-voltage inverter |
| US9099914B2 (en) * | 2011-06-29 | 2015-08-04 | Siemens Aktiengesellschaft | Packaging of power supply using modular electronic modules |
| KR101768256B1 (en) * | 2013-08-29 | 2017-08-14 | 엘에스산전 주식회사 | Inverter with power cell of dual structure |
| KR102546644B1 (en) * | 2016-03-29 | 2023-06-21 | 엘에스일렉트릭(주) | Hybrid power storage apparatus |
| CN108288921B (en) * | 2018-01-23 | 2020-05-22 | 阳光电源股份有限公司 | Control system and control method of cascade inverter |
| GB2571721B (en) * | 2018-03-05 | 2021-01-20 | Ge Aviat Systems Ltd | AC power source |
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