CN113315357B - High-power inverter power supply phase-dislocation control system and method - Google Patents
High-power inverter power supply phase-dislocation control system and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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Abstract
The invention discloses a high-power inverter power supply phase-dislocation control system and a method thereof, wherein the system comprises: the phase error control module and the N PWM signal generation modules are respectively connected with the phase error control module; the PWM signal generating module is used for providing PWM signals for the corresponding inverter power supply module; the phase error control module is configured to output a driving signal for each PWM signal generation module respectively; the driving signal can control the oscillation frequency of the PWM signal generation module so as to enable the inversion frequency of the inversion power supply module to be consistent with the oscillation frequency; the period of the driving signal output by each PWM signal generating module by the phase-staggered control module is T, and the phase difference of each driving signal is T/N in sequence.
Description
Technical Field
The invention relates to the field of welding and cutting power supplies, in particular to a high-power inverter power supply phase-dislocation control system and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Due to the limitation of power devices such as an inverter IGBT, a high-frequency transformer and the like, for a high-power inverter power supply, a plurality of sets of inverter power supplies are connected in parallel to ensure the reliability and the required power of an inverter unit. General inverter units are connected in parallel, and because each parallel unit is independent, the peak value of output current ripple is random, and when output currents are superposed together, the ripple size is unstable, so that the current ripple is large and the precision is low.
At present, an inverter type high-power supply generally adopts a parallel scheme of N sets of inverter power supplies, and generally adopts a mature phase-staggered control scheme, namely a phase-staggered phase T/N, in order to reduce output current ripples, which is a general technical scheme. In the existing phase-error control implementation scheme, an output PWM signal is usually processed by a phase-error controller, so that the phase error of the PWM signal is realized.
Disclosure of Invention
In order to solve the problems, the invention provides a high-power inverter power supply phase-dislocation control system and a method thereof, which can properly improve the frequency of an inverter to gradually reach the required phase by controlling the parameters of a current type PWM control chip oscillator, and can further reduce the output current ripple while realizing high-power output.
In some embodiments, the following technical scheme is adopted:
a high-power inverter power supply phase-dislocation control system comprises:
the phase error control module and the N PWM signal generation modules are respectively connected with the phase error control module; the PWM signal generating module is used for providing PWM signals for the corresponding inverter power supply module;
the phase error control module is configured to output a driving signal for each PWM signal generation module respectively; the driving signal can control the oscillation frequency of the PWM signal generation module so as to enable the inversion frequency of the inversion power supply module to be consistent with the oscillation frequency; the period of the driving signal output by each PWM signal generating module by the phase error control module is T, and the phase difference of each driving signal is T/N in sequence.
Further, the PWM signal generation module includes: the PWM control chip comprises a PWM control chip and a peripheral circuit, wherein the peripheral circuit at least comprises an oscillation timing resistor, an oscillation timing capacitor and a controllable switch device; the oscillation timing resistor and the oscillation timing capacitor are respectively connected with the PWM control chip; the oscillation timing resistor or the oscillation timing capacitor is connected with the controllable switch device.
Furthermore, the oscillation timing resistor is formed by connecting M paths of resistors in parallel, the oscillation timing capacitor is formed by connecting P paths of capacitors in parallel, and one path of resistor or capacitor is connected with the controllable switching device in series; m, P is a positive integer greater than 1.
Further, an output end of a driving signal of the phase-staggered control module is connected with a control end of the controllable switching device, and the driving signal can control the on and off of the controllable switching device.
Further, the driving signal controls a timing resistor of the PWM control chip oscillator to be grounded or controls a timing capacitor of the PWM control chip oscillator to be disconnected from the ground, so that the oscillation frequency of the PWM signal generation module is controlled.
Furthermore, the driving signal drives a controllable switching device connected with the driving signal to be switched on, and a resistor connected with the controllable switching device is grounded, so that the timing resistor of a PWM control chip oscillator connected with the controllable switching device is reduced, the voltage of a timing capacitor of the oscillator reaches an upper limit value, and the frequency of a PWM signal generation module is improved; and finally, the frequency of the driving signal, the frequency of the corresponding PWM signal generation module and the inversion frequency of the inversion power supply module are consistent.
Furthermore, the driving signal drives a controllable switching device connected with the driving signal to be switched off, and a capacitor connected with the controllable switching device is disconnected with the ground, so that the timing capacitor of a PWM control chip oscillator connected with the controllable switching device is reduced, the voltage of the timing capacitor of the oscillator reaches an upper limit value, and the frequency of the PWM signal generation module is improved; and finally, the frequency of the driving signal, the frequency of the corresponding PWM signal generation module and the inversion frequency of the inversion power supply module are consistent.
Further, the phase error control time T of the phase error control module is T/N, where T is a period of the driving signal, that is, a duty cycle of the inverter power module.
Furthermore, the number of the inverter power supply modules is two or more, and the inverter power supply modules are connected in parallel; each set of inverter power supply module corresponds to one PWM signal generation module.
In other embodiments, the following technical solutions are adopted:
a phase error control method for a high-power inverter power supply comprises the following steps:
the oscillation frequency of the PWM signal generation module connected with each inverter power supply module is controlled through the driving signal, so that the inverter frequency of the inverter power supply module is consistent with the frequency of the driving signal and the oscillation frequency of the corresponding PWM signal generation module;
the period of the driving signal output by each PWM signal generation module is T, the phase difference of the driving signals is T/N in sequence, and the inversion frequency phase difference of each inversion power supply module is T/N in sequence, so that the phase error control of the inversion power supply modules is realized, and the output current ripple is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention properly improves the frequency of the inverter to gradually reach the required phase by controlling the parameters of the oscillator, and can further reduce the output current ripple while realizing high-power output.
The invention realizes the output phase error by controlling the phase error of the oscillator frequency in the PWM signal generating module, and the output of the PWM signal generating module is consistent with the oscillation frequency thereof, so that the invention is a scheme for carrying out the phase error control from the source and is simple and effective to realize.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the connection relationship between the phase-error control module, the PWM signal generation module and the inverter module according to the present invention;
FIG. 2 is a schematic diagram of the phase error control provided by the embodiment of the present invention;
FIG. 3 is a waveform diagram of a voltage phase error T/2 of a timing capacitor of an oscillator of a PWM signal generation module according to an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a power inverter power source phase-dislocation control system is disclosed, comprising:
the phase error control module and the N PWM signal generation modules are respectively connected with the phase error control module; the PWM signal generating module is used for providing PWM signals for the inverter power supply module;
the phase error control module is configured to output a driving signal for each PWM signal generation module respectively; the driving signal can control the oscillation frequency of the PWM signal generation module so as to enable the inversion frequency of the inversion power supply module to be consistent with the oscillation frequency; the period of the driving signal output by each PWM signal generating module by the phase-staggered control module is T, and the phase difference of each driving signal is T/N in sequence.
The number of the inverter power supply modules is two or more, and each set of inverter power supply module is connected in parallel; each set of inverter power supply module corresponds to one PWM signal generation module, and provides driving signals for each PWM signal generation module through the phase error control module.
The present embodiment takes two PWM signal generating modules as an example for explanation: each PWM signal generation module is connected with one inverter power supply module and used for providing PWM signals for the inverter power supply module; the two inverter power modules are connected in parallel.
Each PWM signal generation module includes: the PWM current control chip comprises a PWM current control chip and a peripheral circuit, wherein the peripheral circuit at least comprises an oscillation timing resistor, an oscillation timing capacitor and a controllable switching device. The oscillation timing resistor and the oscillation timing capacitor are respectively connected with the PWM control chip; an oscillation timing resistor or an oscillation timing capacitor is connected to the controllable switching device.
The oscillation timing resistor is obtained by connecting M paths of resistors in parallel, the oscillation timing capacitor is obtained by connecting P paths of capacitors in parallel, and one path of resistor or capacitor is connected with the controllable switching device in series; m, P is a positive integer greater than 1.
The output end of a driving signal of the phase-staggered control module is connected with the control end of the controllable switching device, and the driving signal can control the on and off of the controllable switching device.
The phase error control module generates a driving signal Ug1 and a driving signal Ug2, the periods of the driving signal Ug1 and the driving signal Ug2 are both T, and the phase difference is T/2; in the present embodiment, the drive signal Ug1 and the drive signal Ug2 are both in the form of square waves.
The driving signal Ug1 is used for driving a controllable switching device connected with a timing resistor pin of a PWM current control chip oscillator in the first PWM signal generation module;
the driving signal Ug2 is used for driving a controllable switching device connected with a timing resistor pin of a PWM current control chip oscillator in the second PWM signal generation module;
the phase-staggered control module controls the on and off of the controllable switch device, so that the working frequency of the PWM signal generation module is improved, and the frequency and the phase difference which are the same as those of the driving signals are achieved through several to hundreds of unequal periods.
The driving signal controls the timing resistor of the PWM control chip oscillator to be grounded or controls the capacitor of the PWM control chip oscillator to be disconnected from the ground, so that the oscillation frequency of the PWM signal generation module is controlled.
In the embodiment, the phase-error control module is adopted for phase-error control, so that the first PWM signal generation module and the second PWM signal generation module can work in a phase-error mode; the specific working principle is as follows:
the MCU of the phase-staggered control module generates a driving signal Ug1 and a driving signal Ug2, the period of the driving signal Ug1 and the period of the driving signal Ug2 are T, the phase difference is T/2, the driving signal Ug1 drives a controllable switch device connected with a timing resistor pin of a PWM current control chip oscillator in the first PWM signal generation module to be switched off, a resistor connected with the controllable switch device is grounded, the timing resistor of the current control chip oscillator of the first set of PWM signal generation module is instantly and greatly reduced, the voltage of a timing capacitor of the oscillator quickly reaches an upper limit value, the frequency of the PWM signal generation module is improved, and the inverter frequency of the inverter power supply module is finally consistent with the frequency of the driving signal Ug1 and the oscillation frequency of the PWM signal generation module.
Similarly, the driving signal Ug2 drives the controllable switch device connected to the pin of the timing resistor of the PWM current controlled chip oscillator in the second PWM signal generation module to turn off, and the resistor connected to the controllable switch device is grounded, so as to instantaneously and greatly reduce the timing resistor of the PWM current controlled chip oscillator in the second PWM signal generation module, and make the timing capacitor voltage of the oscillator quickly reach the upper limit value.
Or,
after the capacitor of the PWM current control chip oscillator in the first PWM signal generation module is driven by the driving signal Ug1 to disconnect the ground, the timing capacitor of the current control chip oscillator of the first PWM signal generation module is instantly and greatly reduced, so that the voltage of the timing capacitor of the oscillator rapidly reaches the upper limit value, thereby increasing the frequency of the PWM signal generation module, and finally realizing the consistency of the inversion frequency of the inverter power supply module with the frequency of the driving signal Ug1 and the frequency of the PWM signal generation module.
Similarly, after the capacitor of the PWM current control chip oscillator in the first PWM signal generation module is driven by the driving signal Ug1 to disconnect the ground, the timing capacitor of the current control chip oscillator of the first PWM signal generation module is instantly and greatly reduced, so that the voltage of the timing capacitor of the oscillator quickly reaches the upper limit value, thereby increasing the frequency of the PWM signal generation module, and finally realizing the consistency of the inversion frequency of the inverter power supply module with the frequency of the driving signal Ug1 and the frequency of the PWM signal generation module.
Fig. 3 is a waveform diagram of timing capacitor voltage phase error T/2 of the oscillator in the PWM signal generation module provided in this embodiment, and the phase difference between the driving signal Ug1 and the driving signal Ug2 is T/2, the rising slope of the timing capacitor voltage of the PWM current controlled chip oscillator in the first PWM signal generation module suddenly increases, and the time phase difference between the rising slope of the timing capacitor voltage of the PWM current controlled chip oscillator in the second PWM signal generation module suddenly increases by T/2; the phase difference between the time when the voltage of the timing capacitor of the PWM current control chip oscillator in the first PWM signal generation module rises to the maximum value and the time when the voltage of the timing capacitor of the PWM current control chip oscillator in the second set of PWM signal generation module rises to the maximum value is T/2;
considering that the charging resistor almost has negligible effect on the discharging of the timing capacitor voltage of the current-controlled chip oscillator in the PWM signal generation module, the rising time of the timing capacitor voltage of the PWM current-controlled chip oscillator in the first PWM signal generation module from the minimum value is different from the rising time of the timing capacitor voltage of the PWM current-controlled chip oscillator in the second PWM signal generation module from the minimum value by T/2.
The PWM signals output by the PWM signal generating modules output high level when the voltage of the timing capacitor is the minimum value, and output low level after reaching a PI given comparison point, so that the phase difference between the PWM signal output by the first PWM signal generating module and the PWM signal output by the second PWM signal generating module is T/2; and the phase difference of the output currents of the two sets of inverter power supply modules is T/2.
And by analogy, when the system comprises an error phase control module and N PWM signal generation modules, the error phase control module controls the interval time of error phase to be T/N.
The phase-staggered work of the N PWM signal generation modules is controlled by the phase-staggered control module, and the N sets of inverter power supply modules are connected in parallel for use, so that the output of large current and large power can be realized, output current ripples can be reduced, the accuracy of the inverter power supply is ensured, and the quality and the efficiency of the inverter power supply are improved.
Example two
In one or more embodiments, a method for controlling a phase error of a high-power inverter power supply is disclosed, which includes:
the oscillation frequency of the PWM signal generation module connected with each inverter power supply module is controlled through the driving signal, so that the inverter frequency of the inverter power supply module is consistent with the frequency of the driving signal and the oscillation frequency of the corresponding PWM signal generation module;
the period of the driving signal output by each PWM signal generation module is T, the phase difference of each driving signal is T/N in sequence, and the inversion frequency phase difference of each inversion power supply module is T/N in sequence, so that the phase error control of the inversion power supply modules is realized, and the output current ripple is reduced.
The specific implementation of the control method has been described in detail in the first embodiment, and is not described again.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (8)
1. A high-power inverter power supply phase-dislocation control system is characterized by comprising:
the phase error control module and the N PWM signal generation modules are respectively connected with the phase error control module; the PWM signal generating module is used for providing PWM signals for the corresponding inverter power supply module;
the phase error control module is configured to output a driving signal for each PWM signal generation module respectively; the driving signal can control the oscillation frequency of the PWM signal generation module so as to enable the inversion frequency of the inversion power supply module to be consistent with the oscillation frequency; the period of the driving signal output by each PWM signal generating module by the phase-staggered control module is T, and the phase difference of each driving signal is T/N in sequence;
the PWM signal generation module includes: the PWM control chip comprises a PWM control chip and a peripheral circuit, wherein the peripheral circuit at least comprises an oscillation timing resistor, an oscillation timing capacitor and a controllable switch device; the oscillation timing resistor and the oscillation timing capacitor are respectively connected with the PWM control chip; the oscillation timing resistor or the oscillation timing capacitor is connected with the controllable switch device; the driving signal controls the timing resistor of the PWM control chip oscillator to be grounded or controls the timing capacitor of the PWM control chip oscillator to be disconnected from the ground, so that the oscillation frequency of the PWM signal generation module is controlled.
2. The system and method for controlling the phase error of the high-power inverter power supply according to claim 1, wherein the oscillation timing resistor is formed by connecting M resistors in parallel, the oscillation timing capacitor is formed by connecting P capacitors in parallel, and one of the resistors or capacitors is connected in series with the controllable switching device; m, P is a positive integer greater than 1.
3. The power inverter power supply phase-dislocation control system according to claim 1, wherein the output end of the driving signal of the phase-dislocation control module is connected with the control end of the controllable switch device, and the driving signal can control the on and off of the controllable switch device.
4. The power inverter power supply phase-error control system according to claim 1, wherein the driving signal drives a controllable switching device connected with the driving signal to be switched on, and a resistor connected with the controllable switching device is grounded, so that a timing resistor of a PWM control chip oscillator connected with the controllable switching device is reduced, a timing capacitor voltage of the oscillator reaches an upper limit value, and an oscillation frequency of a PWM signal generation module is increased; and finally, the frequency of the driving signal, the oscillation frequency of the corresponding PWM signal generation module and the inversion frequency of the inversion power supply module are consistent.
5. The phase-error control system for the high-power inverter power supply according to claim 1, wherein the driving signal drives the controllable switching device connected with the driving signal to turn off, and the capacitor connected with the controllable switching device is disconnected with the ground, so that the timing capacitor of the oscillator of the PWM control chip connected with the controllable switching device is reduced, the voltage of the timing capacitor of the oscillator reaches an upper limit value, and the oscillation frequency of the PWM signal generation module is increased; and finally, the frequency of the driving signal, the oscillation frequency of the corresponding PWM signal generation module and the inversion frequency of the inversion power supply module are consistent.
6. The power inverter power supply phase-error control system according to claim 1, wherein the phase-error control time T of the phase-error control module is T/N, where T is a period of the driving signal, i.e., a duty cycle of the inverter power supply module.
7. The system according to claim 1, wherein there are two or more sets of inverter modules, each set of inverter modules being connected in parallel; each set of inverter power supply module corresponds to one PWM signal generation module.
8. A phase error control method for a high-power inverter power supply is characterized by comprising the following steps:
the oscillation frequency of the PWM signal generation module connected with each inverter power supply module is controlled through the driving signal, so that the inverter frequency of the inverter power supply module is consistent with the frequency of the driving signal and the oscillation frequency of the corresponding PWM signal generation module;
the period of the driving signal output by each PWM signal generation module is T, the phases of the driving signals sequentially differ by T/N, and the inversion frequency phases of the inversion power supply modules sequentially differ by T/N, so that the phase error control of the inversion power supply modules is realized, and the output current ripple is reduced;
the PWM signal generation module includes: the PWM control chip comprises a PWM control chip and a peripheral circuit, wherein the peripheral circuit at least comprises an oscillation timing resistor, an oscillation timing capacitor and a controllable switch device; the oscillation timing resistor and the oscillation timing capacitor are respectively connected with the PWM control chip; the oscillation timing resistor or the oscillation timing capacitor is connected with the controllable switch device; the driving signal controls the timing resistor of the PWM control chip oscillator to be grounded or controls the timing capacitor of the PWM control chip oscillator to be disconnected from the ground, so that the oscillation frequency of the PWM signal generation module is controlled.
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| US7038552B2 (en) * | 2003-10-07 | 2006-05-02 | Analog Devices, Inc. | Voltage controlled oscillator having improved phase noise |
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| CN104901333B (en) * | 2015-05-05 | 2017-04-12 | 浙江大学 | Three-phase inverter without parallel signal interconnection lines and carrier signal synchronizing method thereof |
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