CN110943642A - Power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system - Google Patents
Power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system Download PDFInfo
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- CN110943642A CN110943642A CN201911275631.3A CN201911275631A CN110943642A CN 110943642 A CN110943642 A CN 110943642A CN 201911275631 A CN201911275631 A CN 201911275631A CN 110943642 A CN110943642 A CN 110943642A
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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
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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Abstract
The invention discloses a power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system, which comprises a pulse width modulation wave generator, an inverter, an output isolation transformer, a current transformer, a sampling resistor, a direct current bias system and a reference sine wave generator, wherein the pulse width modulation wave generator is connected with the inverter; the input end of the inverter is connected with the output end of the pulse width modulation wave generator, the output end of the inverter is connected with the input end of the output isolation transformer, the primary of the output isolation transformer is connected with the input end of the direct current bias system through the current transformer, the output end of the direct current bias system is connected with the input end of the reference sine wave generator, the output end of the reference sine wave generator is connected with the input end of the pulse width modulation wave generator, and the sampling resistor is connected with the current transformer in parallel. The invention adopts a self-adaptive DC bias adjusting method, automatically adjusts the primary DC bias of the inverter according to the magnitude of the primary DC component of the inverter, effectively solves the problem of asymmetric UPS output, and has good batch consistency.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system.
Background
The quality of the output waveform of the UPS can be seriously influenced by the quality of the primary direct current bias size control of the full-bridge inversion of the power frequency UPS, the output waveform of the UPS is directly asymmetric, and particularly, when inductive loads are output, the loads can be damaged.
A power frequency UPS full-bridge inversion primary direct current bias control method is one of UPS technical cores, and the control method comprises manual adjustment and software adjustment, wherein the methods cannot achieve fundamental control, cannot adapt to a load if the methods are manually adjusted, and is poor in batch consistency; if the software is adjusted, the software also cannot be self-adaptive, and the software cannot be well corrected under the influence of hardware. Therefore, how to provide a system capable of adaptively controlling the full-bridge inversion primary dc bias of the power frequency UPS so that the system can completely meet the technical requirements of the UPS is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system, which aims to solve the problems in the prior art and can adopt a pure hardware method to self-adaptively adjust the power frequency UPS full-bridge inversion primary direct current bias so that a power frequency UPS outputs a symmetrical waveform.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system, which comprises a pulse width modulation wave generator, an inverter, an output isolation transformer, a current transformer, a sampling resistor, a direct current bias system and a reference sine wave generator, wherein the pulse width modulation wave generator is connected with the inverter; the input end of the inverter is connected with the output end of the pulse width modulation wave generator, the output end of the inverter is connected with the input end of the output isolation transformer, the primary side of the output isolation transformer is connected with the input end of the direct current bias system through the current transformer, the output end of the direct current bias system is connected with the input end of the reference sine wave generator, the output end of the reference sine wave generator is connected with the input end of the pulse width modulation wave generator, and the sampling resistor is connected with the current transformer in parallel.
Preferably, the dc bias system is used for extracting a dc component in the inverter, and includes an RC low-pass filter and a differential amplification compensator; the input end of the differential amplification compensator is connected with the primary of the output isolation transformer through the current transformer, the output end of the differential amplification compensator is connected with the input end of the RC low-pass filter, and the output end of the RC low-pass filter is connected with the input end of the reference sine wave generator.
Preferably, the inverter adopts an IGBT full bridge inverter for completing the conversion of alternating current and direct current.
Preferably, the dc offset system is configured to extract a dc component in the primary output signal of the inverter, input the extracted dc component into the reference sine wave generator, and perform zero offset adjustment on the reference sine wave generated by the reference sine wave generator, so that positive and negative half cycles of the reference sine wave are axisymmetric with zero.
Preferably, the pwm wave generator is an SPWM wave generator, and is configured to generate an SPWM sine pwm wave, and the inverter is driven by the SPWM sine pwm wave, so that the inverter converts a dc power supply into a sine wave ac power supply.
Preferably, the reference sine wave generator inputs a reference sine wave subjected to zero offset adjustment to the SPWM wave generator, so that the SPWM sine pulse width modulation wave generated by the SPWM wave generator is symmetrical about a zero axis.
The invention discloses the following technical effects: the invention adopts pure hardware self-adaptive control technology, does not need manual regulation, can automatically regulate the primary direct current bias of the inverter according to the primary direct current component of the inverter, and effectively solves the problem of asymmetrical waveform of the sine wave output by the UPS, thereby avoiding the damage of the load caused by asymmetrical waveform of the output of the UPS; meanwhile, under the condition that hardware parameters are fixed, each device adopts a resistance-capacitance device and an IC device which are high in precision and small in error, and the consistency of production batch is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a waveform diagram of the output of the inverter before zero-offset adjustment and DC voltage offset of the present invention, wherein FIG. 2(a) is the waveform diagram of the output of the inverter before zero-offset adjustment, and FIG. 2(b) is the DC voltage offset of the output of the inverter before zero-offset adjustment;
fig. 3 is a waveform diagram of the output of the inverter after zero offset adjustment and dc voltage offset according to the present invention, wherein fig. 3(a) is a waveform diagram of the output of the inverter after zero offset adjustment, and fig. 3(b) is a dc voltage offset output by the inverter after zero offset adjustment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 3, the present embodiment provides a power frequency UPS full-bridge inversion primary dc bias adaptive control system, including a pwm wave generator, an inverter, an output isolation transformer, a current transformer, a sampling resistor, a dc bias system, and a reference sine wave generator; the direct current bias system is used for extracting direct current components in the inverter and comprises an RC low-pass filter and a differential amplification compensator; the input end of the inverter is connected with the output end of the pulse width modulation wave generator, the output end of the inverter is connected with the input end of the output isolation transformer, the primary end of the output isolation transformer is connected with the input end of the differential amplifier through the current transformer, and the output end of the differential amplifier is connected with the input end of the RC low-pass filter; the output end of the RC low-pass filter is connected with the input end of the reference sine wave generator; the output end of the reference sine wave generator is connected with the input end of the pulse width modulation wave generator, and the sampling resistor is connected with the current transformer in parallel.
The selected types and specific working principles of the devices in the embodiment are as follows:
the pulse width modulation wave generator is an SPWM sine pulse width modulation wave generator, carrier triangular waves and sine waves are respectively input to the in-phase end and the inversion end of the comparator LM339, SPWM sine pulse width modulation waves are generated through comparison calculation of the comparator LM339, and the SPWM sine pulse width modulation waves are adopted to drive the inverter, so that the inverter is high in reliability, low in harmonic waves and high in efficiency.
The inverter adopts an IGBT full-bridge inverter, under the drive of the QC962 driving module, four IGBT tubes are complementarily switched on and switched off, commercial power is rectified by a full-bridge rectifying circuit to generate a direct-current power supply, the inverter is driven by SPWM sine pulse width modulation waves, and the direct-current power supply is converted into a pure 50HZ sine wave alternating-current power supply by the inverter.
The output isolation transformer is used for inverting and boosting on one hand and realizing isolation of input and output on the other hand by utilizing the electromagnetic induction principle.
The current transformer obtains the primary current of the output isolation transformer by mutual inductance with the primary of the output isolation transformer, converts the obtained current into voltage through the sampling resistor, and transmits the voltage to the differential amplification compensator for compensation.
The differential amplification compensator adopts TL082 operational amplifier to collect and differentially amplify the primary inductive current of the inverter.
The RC low-pass filter is used for extracting a direct-current component in a primary output signal of the inverter, and the direct-current component is taken out from the primary of the inverter because the direct-current component of the inverter cannot be transmitted to the secondary through the primary of the output isolation transformer; the extracted direct current component is input into a reference sine wave generator, zero offset of the reference sine wave is adjusted, positive and negative half cycles of the reference sine wave are symmetrical with a zero axis, namely the reference sine wave does not deviate from the zero axis, and therefore an SPWM sine pulse width modulation wave modulated by the reference sine wave is symmetrical with the zero axis.
The reference sine wave generator adopts MCU to generate time sequence pulse waveform, generates reference sine wave through a D/A converter, has simple circuit, high stability of output sine wave, low distortion degree and adjustable amplitude, is used for generating reference sine wave, and adjusts the zero offset of the generated reference sine wave through the primary direct current component of the inverter to ensure that the reference sine wave is symmetrical with a zero axis; the SPWM drive waveform is controlled by the adjusted reference sine wave.
The specific working process of the power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system is as follows:
the commercial power is rectified by the full-bridge rectifying circuit to generate a direct current power supply, and the direct current power supply is converted into pure 50HZ sine wave alternating current voltage by the inverter; at the primary end of an output isolation transformer of the inverter, the current in the inverter is taken out through a current transformer, the current is converted into voltage through a sampling resistor, and after the compensation proportion is adjusted through a differential amplification compensator, a direct current component, namely the primary direct current component of the inverter, is extracted through an RC low-pass filter; adjusting zero offset of the reference sine wave through the extracted direct current component to ensure that positive and negative half shafts of the reference sine wave are symmetrical with a zero axis, namely do not deviate from the zero axis; the carrier triangular wave and the reference sine wave after zero offset adjustment are respectively input to the in-phase end and the anti-phase end of the comparator LM339, SPWM sine pulse width modulation waves are generated through comparison, the SPWM sine pulse width modulation waves drive the inverter, and the PWM waves generated by the inverter have no direct current deviation.
As shown in fig. 2, before zero offset adjustment, the positive and negative half cycles of the sine wave output by the inverter are not axisymmetric with respect to zero, and the dc voltage offset is 37.5 mV; as shown in fig. 3, after the adjustment of zero offset, the positive and negative half cycles of the sine wave output by the inverter are substantially symmetrical about the zero axis, and the dc voltage offset is only 0.9 mV. Therefore, the pure hardware self-adaptive control technology is adopted in the embodiment, the primary direct current bias of the inverter can be automatically adjusted according to the primary direct current component of the inverter, and the problem of asymmetry of waveform of sine wave output by the UPS is effectively solved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A power frequency UPS full-bridge inversion primary direct current bias self-adaptive control system is characterized by comprising a pulse width modulation wave generator, an inverter, an output isolation transformer, a current transformer, a sampling resistor, a direct current bias system and a reference sine wave generator; the input end of the inverter is connected with the output end of the pulse width modulation wave generator, the output end of the inverter is connected with the input end of the output isolation transformer, the primary side of the output isolation transformer is connected with the input end of the direct current bias system through the current transformer, the output end of the direct current bias system is connected with the input end of the reference sine wave generator, the output end of the reference sine wave generator is connected with the input end of the pulse width modulation wave generator, and the sampling resistor is connected with the current transformer in parallel.
2. The power frequency UPS full-bridge inversion primary direct current bias adaptive control system according to claim 1, wherein the direct current bias system is used for extracting direct current components in the inverter and comprises an RC low-pass filter and a differential amplification compensator; the input end of the differential amplification compensator is connected with the primary of the output isolation transformer through the current transformer, the output end of the differential amplification compensator is connected with the input end of the RC low-pass filter, and the output end of the RC low-pass filter is connected with the input end of the reference sine wave generator.
3. The power frequency UPS full-bridge inversion primary direct current bias adaptive control system of claim 1, wherein the inverter is an IGBT full-bridge inverter and is used for completing alternating current and direct current conversion.
4. The power frequency UPS full-bridge inversion primary direct current bias adaptive control system according to claim 1, wherein the direct current bias system is used for extracting a direct current component in an inverter primary output signal, inputting the extracted direct current component into the reference sine wave generator, and performing zero bias adjustment on a reference sine wave generated by the reference sine wave generator to enable positive and negative half cycles of the reference sine wave to be axisymmetric with zero.
5. The power frequency UPS full-bridge inversion primary DC bias adaptive control system of claim 4, wherein the PWM wave generator is an SPWM wave generator for generating SPWM sine PWM wave, and the inverter is driven by the SPWM sine PWM wave to convert DC power into sine AC power.
6. The industrial frequency UPS full-bridge inversion primary direct current bias adaptive control system of claim 5, wherein the reference sine wave generator inputs a zero-bias adjusted reference sine wave to the SPWM wave generator, so that the SPWM sine pulse width modulation wave generated by the SPWM wave generator is zero-axis symmetric.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899820A (en) * | 2022-06-13 | 2022-08-12 | 江苏方洋能源科技有限公司 | Method for optimizing output voltage waveform quality of cascade type electric energy quality device |
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| CN1645731A (en) * | 2004-01-19 | 2005-07-27 | 厦门科华恒盛股份有限公司 | Regulating method and device for sine wave dc-to-ac converter bias magnet |
| CN200956557Y (en) * | 2006-07-08 | 2007-10-03 | 漳州科华技术有限责任公司 | Inverter output waveform symmetrical correcting device |
| JP2008289211A (en) * | 2007-05-15 | 2008-11-27 | Shindengen Electric Mfg Co Ltd | System-cooperative inverter |
| CN101674027A (en) * | 2008-09-10 | 2010-03-17 | 力博特公司 | Method and device for restraining direct current magnetic biasing for output transformer of inverter |
| JP2011199980A (en) * | 2010-03-18 | 2011-10-06 | Panasonic Corp | Inverter device, and photovoltaic power generation system |
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2019
- 2019-12-12 CN CN201911275631.3A patent/CN110943642A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645731A (en) * | 2004-01-19 | 2005-07-27 | 厦门科华恒盛股份有限公司 | Regulating method and device for sine wave dc-to-ac converter bias magnet |
| CN200956557Y (en) * | 2006-07-08 | 2007-10-03 | 漳州科华技术有限责任公司 | Inverter output waveform symmetrical correcting device |
| JP2008289211A (en) * | 2007-05-15 | 2008-11-27 | Shindengen Electric Mfg Co Ltd | System-cooperative inverter |
| CN101674027A (en) * | 2008-09-10 | 2010-03-17 | 力博特公司 | Method and device for restraining direct current magnetic biasing for output transformer of inverter |
| JP2011199980A (en) * | 2010-03-18 | 2011-10-06 | Panasonic Corp | Inverter device, and photovoltaic power generation system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114899820A (en) * | 2022-06-13 | 2022-08-12 | 江苏方洋能源科技有限公司 | Method for optimizing output voltage waveform quality of cascade type electric energy quality device |
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