CN102820766A - Method and device for controlling pulse width modulation - Google Patents
Method and device for controlling pulse width modulation Download PDFInfo
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- CN102820766A CN102820766A CN2012102882572A CN201210288257A CN102820766A CN 102820766 A CN102820766 A CN 102820766A CN 2012102882572 A CN2012102882572 A CN 2012102882572A CN 201210288257 A CN201210288257 A CN 201210288257A CN 102820766 A CN102820766 A CN 102820766A
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Abstract
The invention discloses a method for controlling pulse width modulation. The method is applied between a main control plate and a power unit plate which are in communication connection. The main control plate generates and detects a carrier with fixed frequency and sends an interruption instruction to the power unit plate when the crest or the trough of the carrier is reached, so that the power unit plate interrupts the current work and acquires the three-phase current, the three-phase voltage and the bus voltage of an inverter circuit arranged on the power unit plate; the power unit plate preferentially transmits the acquired three-phase current, three-phase voltage and bus voltage to the main control plate; the main control plate calculates to obtain a pulse width modulation wave according to the three-phase current, the three-phase voltage and the bus voltage; and the power unit plate controls the connection and the disconnection of a three-phase bridge arm in the inverter circuit according to the pulse width modulation wave. By the method, the three-phase current, the three-phase voltage and the bus voltage can be timely acquired, and the real-time property and the accuracy of the pulse width modulation wave which is obtained through calculation are ensured.
Description
Technical field
The present invention relates to the power control techniques field, be specifically related to a kind of pulse width modulation control method and device thereof.
Background technology
Pulse width modulation (PWM; Pulse Width Modulation) be a kind of analog control mode; Its variation according to respective loads comes the biasing of modulation crystal tube grid or base stage; Realize switching power supply output transistor or the change of transistor turns time, this mode can make the output voltage of power supply when operation conditions change, keep constant, is a kind of very effective technology of utilizing the digital signal of microprocessor that analog circuit is controlled.
In frequency-changing control system, master control borad is responsible for handling main calculation task and control logic, and the power cell plate is responsible for the system parameters collection, generally adopts the mode of electrical isolation to communicate between the two.Because master control borad can not directly be controlled sampling, therefore generally by power cell plate control sampling, and the sampling of power cell plate generally is the method that adopts timing sampling.In order to improve the stability of sampled data, be employed in the method for calculating mean value then of repeatedly sampling in the timing cycle usually.TM320F280x family chip with TI is an example, is 40MHz in operating frequency, and sampling window (ACQPS) is 6 o'clock; Accomplishing once, sampling needs 500ns consuming time; Suppose that average value filtering repeats 20 samplings, need 10us consuming time altogether, promptly the cycle of timing sampling can not be lower than 10us; After the sampling period was set, sample frequency had also just been fixed.Voltage, the current parameters that master control borad need utilize the power cell plate to collect calculates in real time and generates the PWM ripple; And these parameter values will be delayed time a sampling period than actual value; When frequency of modulated wave changes greatly even will produce bigger error, and then cause the decline of frequency conversion system overall performance.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of pulse width modulation control method, can improve the real-time and the accuracy of pulse width modulation.The embodiment of the invention also provides corresponding device thereof.
First aspect present invention provides a kind of pulse width modulation control method, is applied in the master control borad with the power cell board communications, and said pulse width modulation control method comprises: generate the carrier wave of fixed frequency, and detect said carrier wave; When crest that detects the said carrier wave of arrival or trough; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad; Said three-phase current, three-phase voltage and busbar voltage that reception is sent from said power cell plate; Calculate the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; And send said pulse width modulation ripple to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
Preferably, also comprise: receive the fault-signal that said power cell plate sends, and said fault-signal is responded.
Second aspect present invention provides a kind of pulse width modulation control method; In the power cell plate that is applied to communicate by letter with master control borad; Said pulse width modulation control method comprises: receive the interrupt instruction that said master control borad sends, and interrupt current ongoing work; Collection is arranged on three-phase current, three-phase voltage and the busbar voltage of the inverter circuit on the said power cell plate; The said three-phase current, three-phase voltage and the busbar voltage that collect are preferentially sent to said master control borad, so that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; The said pulse width modulation ripple that reception is sent from said master control borad, and control the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
Preferably, also comprise: first preset time and second preset time are set, and wherein, said first preset time is less than said second preset time; When arriving said first preset time, gather the temperature of electric capacity and insulated gate bipolar transistor in the said inverter circuit; The temperature of electric capacity and insulated gate bipolar transistor is greater than the temperature preset value in the said inverter circuit that collects; Perhaps said three-phase current, three-phase voltage and busbar voltage do not reach pre-conditioned; And when reaching said second preset time; Send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
Third aspect present invention provides a kind of master control borad, is connected with the power cell board communications, comprising: the carrier wave generation unit is used to generate the carrier wave of fixed frequency; The carrier wave detecting unit is used to detect the carrier wave that said carrier wave generation unit is generated; First transmitting element; Be used for when said carrier wave detection goes out to arrive crest or the trough of said carrier wave; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate, wherein, said three-phase current, three-phase voltage and the busbar voltage that said power cell plate will collect preferentially sent to said master control borad; First receiving element is used to receive said three-phase current, three-phase voltage and the busbar voltage of sending from said power cell plate; Computing unit is used for the three-phase current, three-phase voltage and the busbar voltage that receive according to said first receiving element, calculates the pulse width modulation ripple; Wherein, said first transmitting element also is used for sending the pulse width modulation ripple that said computing unit calculates to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
Preferably, also comprise response unit, wherein, said first receiving element also is used to receive the fault-signal that said power cell plate sends; Said response unit is used for the fault-signal that said first receiving element receives is responded.
Fourth aspect present invention provides a kind of power cell plate, and communicating by letter with master control borad is connected, and comprising: second receiving element is used to receive the interrupt instruction of sending from said master control borad; Interrupt location is used for after said second receiving element receives said interrupt instruction, interrupting current ongoing work; Collecting unit is used for after said interrupt location interrupts current ongoing work, gathers the three-phase current, three-phase voltage and the busbar voltage that are arranged on the inverter circuit on the said power cell plate; Second transmitting element; The said three-phase current, three-phase voltage and the busbar voltage that are used for said collecting unit is collected are preferentially sent to said master control borad; So that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; Wherein, said second receiving element also is used to receive the said pulse width modulation ripple that sends from said master control borad; Control unit is used for controlling according to the said pulse width modulation ripple that said second receiving element receives the break-make of said inverter circuit three-phase brachium pontis.
Preferably, also comprise: the unit is set, is used to be provided with first preset time and second preset time, wherein, said first preset time is less than said second preset time; Said collecting unit, also be used for arrive said when first preset time that the unit is provided with is set, the temperature of gathering electric capacity and insulated gate bipolar transistor in the said inverter circuit; Fault detection unit, the said inverter circuit electric capacity that is used for collecting according to said collecting unit and the temperature of insulated gate bipolar transistor or said three-phase current, three-phase voltage and busbar voltage detect said inverter circuit; Said second transmitting element; Also be used for temperature at detected said inverter circuit electric capacity of said fault detection unit and insulated gate bipolar transistor greater than the temperature preset value; Perhaps said three-phase current, three-phase voltage and busbar voltage do not reach pre-conditioned; And when reaching said second preset time, send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
Fifth aspect present invention provides a kind of pulse width modulation control device, comprising: master control borad and power cell plate.Said master control borad is connected with said power cell board communications; Said master control borad is used to generate the carrier wave of fixed frequency, and detects said carrier wave, when crest that detects the said carrier wave of arrival or trough, sends interrupt instruction to said power cell plate; Said power cell plate; Be used to receive the interrupt instruction that said master control borad sends; And interrupt current ongoing work and transfer to gather being arranged on three-phase current, three-phase voltage and the busbar voltage of the inverter circuit on the said power cell plate, and said three-phase current, three-phase voltage and the busbar voltage that will collect are preferentially sent to said master control borad; Said master control borad also is used for calculating the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage, and sends said pulse width modulation ripple to said power cell plate; Said power cell plate also is used to receive the said pulse width modulation ripple that sends from said master control borad, and controls the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
The pulse width modulation control method that provides in the embodiment of the invention is applied in the master control borad with the power cell board communications, and said pulse width modulation control method comprises: generate the carrier wave of fixed frequency, and detect said carrier wave; When crest that detects the said carrier wave of arrival or trough; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad; Said three-phase current, three-phase voltage and busbar voltage that reception is sent from said power cell plate; Calculate the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; And send said pulse width modulation ripple to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.In prior art; Timing acquiring three-phase current, three-phase voltage and busbar voltage are compared; The scheme that the embodiment of the invention provides; Can in time gather three-phase current, three-phase voltage and busbar voltage, thereby the real-time and the accuracy of the pulse width modulation ripple that has guaranteed to calculate have improved the control ability of pulse width modulation control device.
Description of drawings
Fig. 1 is an embodiment sketch map of the method that provides of the embodiment of the invention;
Fig. 2 is another embodiment sketch map of the method that provides of the embodiment of the invention;
Fig. 3 is the application scenarios embodiment sketch map that the embodiment of the invention provides;
Fig. 4 is an embodiment sketch map of the master control borad that provides of the embodiment of the invention;
Fig. 5 is another embodiment sketch map of the master control borad that provides of the embodiment of the invention;
Fig. 6 is an embodiment sketch map of the power cell plate that provides of the embodiment of the invention;
Fig. 7 is another embodiment sketch map of the power cell plate that provides of the embodiment of the invention;
Fig. 8 is an embodiment sketch map of the pulse width modulation control device that provides of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of pulse width modulation control method, can improve the real-time and the accuracy of pulse width modulation.The embodiment of the invention also provides corresponding device thereof.Below be elaborated respectively.
Consult Fig. 1, from the angle of master control borad, an embodiment of the pulse width modulation control method that the embodiment of the invention provides comprises:
101, generate the carrier wave of fixed frequency, and detect said carrier wave.
Carrier wave is generally triangular wave; Pulse width modulation (PWM, Pulse Width Modulation) ripple is calculated at crest or trough place at carrier wave, and this pulse duration is sent to the power cell plate; Make the power cell plate control the break-make of the three-phase brachium pontis of the inverter circuit that is provided with on the said power cell plate; Specifically be that conducting or disconnection are confirmed by the pulse width modulation ripple, if then conducting of high level, if low level is then broken off.
102, when crest that detects the said carrier wave of arrival or trough; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad.
Control the break-make of the three-phase brachium pontis of said inverter circuit, need to generate earlier the PWM ripple, master control borad need obtain three-phase voltage, three-phase current and the busbar voltage that generates the PWM ripple.In the prior art; Master control borad can only be passive grade by the time during a sampling period; Could receive three-phase voltage, three-phase current and busbar voltage from the power cell plate; Could generate the PWM ripple through calculating, but because of three-phase voltage, three-phase current and the busbar voltage of such acquisition postpones if having time, real-time and the accuracy of the PWM that can cause calculating are low.
Among the present invention program; When crest that detects the said carrier wave of arrival or trough; Master control borad sends interrupt instruction and gives the power cell plate; The power cell plate interrupts current ongoing work and transfers to gather immediately being arranged on three-phase voltage, three-phase current and the busbar voltage on the said power cell plate, and after collecting three-phase voltage, three-phase current and busbar voltage, preferentially sends the said three-phase current that collects, three-phase voltage and busbar voltage to master control borad.
103, receive said three-phase current, three-phase voltage and the busbar voltage of sending from said power cell plate.
104, calculate the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; And send said pulse width modulation ripple to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
The detailed process of calculating the pulse width modulation ripple is: the angle that said three-phase voltage information is calculated voltage vector and d axle through phase-locked loop; This angle and said three-phase current are carried out after the dq conversion feedback as electric current loop; The feedback of this electric current loop and said busbar voltage passing ratio integration (PI; Proportional integral) regulating the current reference value obtain carries out proportional integral PI and regulates and obtain the output voltage command value; The angle calculating voltage vector sector, place that obtains according to previous calculations also obtains sector number, obtains the ON time of three-phase brachium pontis according to this voltage instruction value and sector number, generates said pulse width modulation ripple.
Behind the master control borad production burst width modulated ripple, send said pulse width modulation ripple, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple to said power cell plate.
The pulse width modulation control method that provides in the embodiment of the invention is applied in the master control borad with the power cell board communications, and said pulse width modulation control method comprises: generate the carrier wave of fixed frequency, and detect said carrier wave; When crest that detects the said carrier wave of arrival or trough; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad; Said three-phase current, three-phase voltage and busbar voltage that reception is sent from said power cell plate; Calculate the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; And send said pulse width modulation ripple to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.In prior art; Timing acquiring three-phase current, three-phase voltage and busbar voltage are compared; The scheme that the embodiment of the invention provides; Can in time gather three-phase current, three-phase voltage and busbar voltage, thereby the real-time and the accuracy of the pulse width modulation ripple that has guaranteed to calculate have improved the control ability of pulse width modulation control device.
Alternatively, on the basis of the corresponding embodiment of above-mentioned Fig. 1, another embodiment provided by the invention also comprises the fault-signal that the received power cell board sends, and said fault-signal is responded, as after receiving fault-signal, sends warning message etc.
The reason that causes fault generally includes: excess temperature, overvoltage, under-voltage, power down, phase shortage, power failure, bridge insulated gate bipolar transistor overvoltage or under-voltage etc. up and down.
Consult Fig. 2, from the angle of power cell plate, another embodiment of the pulse width modulation control method that the embodiment of the invention provides comprises:
201, receive the interrupt instruction that master control borad sends, and interrupt current ongoing work.
After the power cell plate receives interrupt instruction, interrupt current ongoing work immediately.
202, gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate.
Three-phase current, three-phase voltage and busbar voltage are the useful informations that is used to calculate the PWM ripple, so will preferentially gather, in addition, the power cell plate also can be gathered the temperature of electric capacity and insulated gate bipolar transistor in the said inverter circuit; Even but when gathering electronic device temperature, the power cell plate is as receiving interrupt instruction, also interrupt capture electronic device temperature immediately, then gather three-phase current, three-phase voltage and busbar voltage.
The temperature of electric capacity and insulated gate bipolar transistor can be gathered according to the time cycle in the said inverter circuit, as first preset time and second preset time are set, and said first preset time is less than said second preset time.Like first preset time is 30 microseconds, and second preset time is 60 microseconds.
When arriving said first preset time, gather the temperature of electric capacity and insulated gate bipolar transistor in the said inverter circuit; Whether the temperature that detects electric capacity and insulated gate bipolar transistor in the said inverter circuit is greater than the temperature preset value; When the temperature of electric capacity and insulated gate bipolar transistor in the said inverter circuit that collects greater than the temperature preset value and when reaching said second preset time; Send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
During detection failure; Also to detect three-phase current, three-phase voltage and busbar voltage and whether reach pre-conditioned; As three-phase current, three-phase voltage whether phase shortage, three-phase voltage and busbar voltage whether within preset voltage range; When three-phase voltage and busbar voltage overvoltage or when under-voltage, when three-phase current, phase of three-phase voltage; The power cell plate also can send fault-signal to said master control borad, so that said master control borad responds to said fault-signal when reaching said second preset time.
Said three-phase current, three-phase voltage and the busbar voltage that 203, will collect preferentially sent to said master control borad, so that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage.
The three-phase current that the power cell plate collects, three-phase voltage and busbar voltage are when being transferred to master control borad; Priority is set to the highest; When transmitting Deng needs; Preferentially send the said three-phase current that collects, three-phase voltage and busbar voltage, can be transferred to master control borad timely to guarantee three-phase current, three-phase voltage and busbar voltage to master control borad.
204, receive the said pulse width modulation ripple that sends from said master control borad, and control the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
The pulse width modulation control method that the embodiment of the invention provides, in the power cell plate that is applied to communicate by letter with master control borad, said technical scheme comprises: receive the interrupt instruction that said master control borad sends, and interrupt current ongoing work; Collection is arranged on three-phase current, three-phase voltage and the busbar voltage of the inverter circuit on the said power cell plate; The said three-phase current, three-phase voltage and the busbar voltage that collect are preferentially sent to said master control borad, so that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; The said pulse width modulation ripple that reception is sent from said master control borad, and control the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
For the ease of understanding, consult Fig. 3, be example with a concrete application scenarios below, specify the detailed process of pulse width modulation control method of the present invention:
Master control borad comprises a field programmable gate array (FPGA; Field-Programmable Gate Array) module and a Digital Signal Processing (DSP; Digital Signal Processing) module, power cell plate comprise a FPGA module and a DSP module.
When 301, the DSP module of master control borad identifies the crest that arrives carrier wave or trough place; Send interrupt instruction to the power cell plate; After the FPGA module of power cell plate receives this interrupt instruction, be interrupt pin pulse of DSP block configuration of power cell plate.
302, the FPGA module of power cell plate is given this interrupt pin pulsing the DSP module of power cell plate.
303, after the DSP module of power cell plate receives the interrupt pin pulse, interrupt ongoing work immediately, then gather three-phase current, three-phase voltage and busbar voltage.
304, the DSP module of power cell plate is sent three-phase current, three-phase voltage and the busbar voltage that collects to power cell plate FPGA module.
305, power cell plate FPGA module is encoded to three-phase current, three-phase voltage and busbar voltage.
306, power cell plate FPGA module is through the communication transmission media between master control borad and the power cell plate, like optical fiber etc., three-phase current, three-phase voltage and busbar voltage after encoding sent to the FPGA module of master control borad.
307, the FPGA module of master control borad is decoded to the three-phase current, three-phase voltage and the busbar voltage that receive.
308, the FPGA module of master control borad sends to decoded three-phase current, three-phase voltage and busbar voltage the DSP module of master control borad.
309, the DSP module of master control borad is calculated the PWM ripple according to three-phase current, three-phase voltage and busbar voltage, and controls the break-make of inverter circuit three-phase brachium pontis according to this PWM ripple.
In above-mentioned application scenarios; The temperature that also comprises the DSP module timing acquiring electronic device of power cell plate, and whether have fault according to the temperature detection of electronic device, if there is fault; Then fault-signal is sent to the DSP module of master control borad, the DSP module is in time carried out alarm response.
Consult Fig. 4, an embodiment of the master control borad 40 that provides for the embodiment of the invention.As shown in the figure, master control borad 40 comprises carrier wave generation unit 401, carrier wave detecting unit 402, first transmitting element 403, first receiving element 404 and computing unit 405.
Carrier wave generation unit 401 is used to generate the carrier wave of fixed frequency.
Carrier wave detecting unit 402 is used to detect the carrier wave that said carrier wave generation unit 401 generates.
First transmitting element 403; Be used for when said carrier wave detection goes out to arrive crest or the trough of said carrier wave; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate, wherein, said three-phase current, three-phase voltage and the busbar voltage that said power cell plate will collect preferentially sent to said master control borad.
First receiving element 404 is used to receive said three-phase current, three-phase voltage and the busbar voltage of sending from said power cell plate.
Wherein, Said first transmitting element 403; Also be used for sending the pulse width modulation ripple that said computing unit calculates, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple to said power cell plate.
In the embodiment of the invention, carrier wave generation unit 401 generates the carrier wave of fixed frequency; Carrier wave detecting unit 402 detects the carrier wave that said carrier wave generation unit 401 generates; When first transmitting element 403 goes out to arrive crest or the trough of said carrier wave in said carrier wave detection; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad; First receiving element 404 receives said three-phase current, three-phase voltage and the busbar voltage of sending from said power cell plate; Computing unit 405 calculates the pulse width modulation ripple according to three-phase current, three-phase voltage and busbar voltage that said first receiving element receives; Wherein, said first transmitting element 403 sends the pulse width modulation ripple that said computing unit calculates to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.The master control borad that the embodiment of the invention provides can trigger timely collection three-phase voltage, three-phase current and busbar voltage, thereby the real-time and the accuracy of the pulse width modulation ripple that has guaranteed to calculate have improved the control ability of pulse width modulation control device.
Consult Fig. 5, another embodiment of the master control borad that provides for the embodiment of the invention, on the basis of the corresponding embodiment of above-mentioned Fig. 4, master control borad 40 also comprises response unit 406.
Wherein, said first receiving element 404 also is used for the fault-signal that the received power cell board sends.
Consult Fig. 6, an embodiment of the power cell plate 50 that provides for the embodiment of the invention.As shown in the figure, power cell plate 50 comprises second receiving element 501, interrupt location 502, collecting unit 503, second transmitting element 504 and control unit 505.
Second receiving element 501 is used to receive the interrupt instruction of sending from said master control borad;
Interrupt location 502 is used for after said second receiving element 501 receives said interrupt instruction, interrupting current ongoing work;
Collecting unit 503 is used for after said interrupt location 502 interrupts current ongoing work, gathering the three-phase current, three-phase voltage and the busbar voltage that are arranged on the inverter circuit on the said power cell plate;
Second transmitting element 504; The said three-phase current, three-phase voltage and the busbar voltage that are used for said collecting unit is collected are preferentially sent to said master control borad; So that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage, wherein
Said second receiving element 501 also is used to receive the said pulse width modulation ripple that sends from said master control borad;
In the embodiment of the invention, second receiving element 501 receives the interrupt instruction of sending from said master control borad; Interrupt location 502 interrupts current ongoing work after said second receiving element 501 receives said interrupt instruction; Collecting unit 503 is gathered the three-phase current, three-phase voltage and the busbar voltage that are arranged on the inverter circuit on the said power cell plate after said interrupt location 502 interrupts current ongoing work; Said three-phase current, three-phase voltage and busbar voltage that second transmitting element 504 is used for said collecting unit is collected are preferentially sent to said master control borad; So that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; Wherein, said second receiving element 501 also receives the said pulse width modulation ripple that sends from said master control borad; The said pulse width modulation ripple that control unit 505 receives according to said second receiving element 501 is controlled the break-make of three-phase brachium pontis in the said inverter circuit.The power cell plate that the embodiment of the invention provides can in time be gathered three-phase voltage, three-phase current and busbar voltage, thereby the real-time and the accuracy of the pulse width modulation ripple that has guaranteed to calculate have improved the control ability of pulse width modulation control device.
Consult Fig. 7, another embodiment of the power cell plate 50 that provides for the embodiment of the invention, on the basis of the corresponding embodiment of above-mentioned Fig. 6, power cell plate 50 also comprises unit 506 and fault detection unit 507 is set.
Said collecting unit 503, also be used for arrive said when the unit being set 506 first preset time being set, the temperature of gathering electric capacity and insulated gate bipolar transistor in the said inverter circuit;
Said second transmitting element 504; Also be used for temperature at said fault detection unit 507 detected said inverter circuit electric capacity and insulated gate bipolar transistor greater than the temperature preset value; Perhaps said three-phase current, three-phase voltage and busbar voltage do not reach pre-conditioned; And when reaching said second preset time, send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
Consult Fig. 8, an embodiment of the pulse width modulation control device that the embodiment of the invention provides.As shown in the figure, the pulse width modulation control device comprises master control borad 40 and power cell plate 50, wherein, can pass through concrete communication transmission media between master control borad 40 and the power cell plate 50, like optical fiber etc., communicates connection.
Said master control borad 40 is used to generate the carrier wave of fixed frequency, and detects said carrier wave; When crest that detects the said carrier wave of arrival or trough, send interrupt instruction to said power cell 50 plates;
Said power cell plate 50 is used to receive the interrupt instruction that said master control borad 40 sends, and interrupts current ongoing work and transfer to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on said power cell 50 plates; And said three-phase current, three-phase voltage and the busbar voltage that will collect are preferentially sent to said master control borad 40;
Said master control borad 40 also is used for calculating the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage, and sends said pulse width modulation ripple to said power cell plate 50;
Said power cell plate 50 also is used to receive the said pulse width modulation ripple that sends from said master control borad 40, and controls the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
The pulse width modulation control device that the embodiment of the invention provides; Can in time gather three-phase voltage, three-phase current and busbar voltage; Thereby the real-time and the accuracy of the pulse width modulation ripple that has guaranteed to calculate have improved the control ability of pulse width modulation control device.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to accomplish through program; This program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than pulse width modulation control method and device that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. pulse width modulation control method is applied to it is characterized in that said pulse width modulation control method comprises in the master control borad with the power cell board communications:
Generate the carrier wave of fixed frequency, and detect said carrier wave;
When crest that detects the said carrier wave of arrival or trough; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate; Wherein, said power cell plate said three-phase current, three-phase voltage and the busbar voltage that will collect preferentially sent to said master control borad;
Said three-phase current, three-phase voltage and busbar voltage that reception is sent from said power cell plate;
Calculate the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage; And send said pulse width modulation ripple to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
2. pulse width modulation control method according to claim 1 is characterized in that, also comprises:
Receive the fault-signal that said power cell plate sends, and said fault-signal is responded.
3. a pulse width modulation control method in the power cell plate that is applied to communicate by letter with master control borad, is characterized in that, said pulse width modulation control method comprises:
Receive the interrupt instruction that said master control borad sends, and interrupt current ongoing work;
Collection is arranged on three-phase current, three-phase voltage and the busbar voltage of the inverter circuit on the said power cell plate;
The said three-phase current, three-phase voltage and the busbar voltage that collect are preferentially sent to said master control borad, so that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage;
The said pulse width modulation ripple that reception is sent from said master control borad, and control the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
4. pulse width modulation control method according to claim 3 is characterized in that, also comprises:
First preset time and second preset time are set, and wherein, said first preset time is less than said second preset time;
When arriving said first preset time, gather the temperature of electric capacity and insulated gate bipolar transistor in the said inverter circuit;
The temperature of electric capacity and insulated gate bipolar transistor is greater than the temperature preset value in the said inverter circuit that collects; Perhaps said three-phase current, three-phase voltage and busbar voltage do not reach pre-conditioned; And when reaching said second preset time; Send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
5. a master control borad is connected with the power cell board communications, it is characterized in that, comprising:
The carrier wave generation unit is used to generate the carrier wave of fixed frequency;
The carrier wave detecting unit is used to detect the carrier wave that said carrier wave generation unit is generated;
First transmitting element; Be used for when said carrier wave detection goes out to arrive crest or the trough of said carrier wave; Send interrupt instruction to said power cell plate; So that said power cell plate interrupts current ongoing work and transfers to gather three-phase current, three-phase voltage and the busbar voltage that is arranged on the inverter circuit on the said power cell plate, wherein, said three-phase current, three-phase voltage and the busbar voltage that said power cell plate will collect preferentially sent to said master control borad;
First receiving element is used to receive said three-phase current, three-phase voltage and the busbar voltage of sending from said power cell plate;
Computing unit is used for the three-phase current, three-phase voltage and the busbar voltage that receive according to said first receiving element, calculates the pulse width modulation ripple;
Wherein, said first transmitting element also is used for sending the pulse width modulation ripple that said computing unit calculates to said power cell plate, so that said power cell buttress is controlled the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
6. master control borad according to claim 5 is characterized in that, also comprises response unit, wherein,
Said first receiving element also is used to receive the fault-signal that said power cell plate sends;
Said response unit is used for the fault-signal that said first receiving element receives is responded.
7. power cell plate, communicating by letter with master control borad is connected, and it is characterized in that, comprising:
Second receiving element is used to receive the interrupt instruction of sending from said master control borad;
Interrupt location is used for after said second receiving element receives said interrupt instruction, interrupting current ongoing work;
Collecting unit is used for after said interrupt location interrupts current ongoing work, gathers the three-phase current, three-phase voltage and the busbar voltage that are arranged on the inverter circuit on the said power cell plate;
Second transmitting element; The said three-phase current, three-phase voltage and the busbar voltage that are used for said collecting unit is collected are preferentially sent to said master control borad; So that said master control borad calculates the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage, wherein
Said second receiving element also is used to receive the said pulse width modulation ripple that sends from said master control borad;
Control unit is used for controlling according to the said pulse width modulation ripple that said second receiving element receives the break-make of said inverter circuit three-phase brachium pontis.
8. power cell plate according to claim 7 is characterized in that, also comprises
The unit is set, is used to be provided with first preset time and second preset time, wherein, said first preset time is less than said second preset time;
Said collecting unit, also be used for arrive said when first preset time that the unit is provided with is set, the temperature of gathering electric capacity and insulated gate bipolar transistor in the said inverter circuit;
Fault detection unit, the said inverter circuit electric capacity that is used for collecting according to said collecting unit and the temperature of insulated gate bipolar transistor or said three-phase current, three-phase voltage and busbar voltage detect said inverter circuit;
Said second transmitting element; Also be used for temperature at detected said inverter circuit electric capacity of said fault detection unit and insulated gate bipolar transistor greater than the temperature preset value; Perhaps said three-phase current, three-phase voltage and busbar voltage do not reach pre-conditioned; And when reaching said second preset time, send fault-signal to said master control borad, so that said master control borad responds to said fault-signal.
9. a pulse width modulation control device is characterized in that, comprising: master control borad and power cell plate, and said master control borad is connected with said power cell board communications;
Said master control borad is used to generate the carrier wave of fixed frequency, and detects said carrier wave, when crest that detects the said carrier wave of arrival or trough, sends interrupt instruction to said power cell plate;
Said power cell plate; Be used to receive the interrupt instruction that said master control borad sends; And interrupt current ongoing work and transfer to gather being arranged on three-phase current, three-phase voltage and the busbar voltage of the inverter circuit on the said power cell plate, and said three-phase current, three-phase voltage and the busbar voltage that will collect are preferentially sent to said master control borad;
Said master control borad also is used for calculating the pulse width modulation ripple according to said three-phase current, three-phase voltage and busbar voltage, and sends said pulse width modulation ripple to said power cell plate;
Said power cell plate also is used to receive the said pulse width modulation ripple that sends from said master control borad, and controls the break-make of three-phase brachium pontis in the said inverter circuit according to said pulse width modulation ripple.
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| CN201210288257.2A CN102820766B (en) | 2012-08-14 | 2012-08-14 | Method and device for controlling pulse width modulation |
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| CN201210288257.2A CN102820766B (en) | 2012-08-14 | 2012-08-14 | Method and device for controlling pulse width modulation |
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| CN102820766B (en) | 2015-01-14 |
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