CN111555601A - Soft start method of three-phase Vienna power factor correction circuit - Google Patents
Soft start method of three-phase Vienna power factor correction circuit Download PDFInfo
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- CN111555601A CN111555601A CN202010341732.2A CN202010341732A CN111555601A CN 111555601 A CN111555601 A CN 111555601A CN 202010341732 A CN202010341732 A CN 202010341732A CN 111555601 A CN111555601 A CN 111555601A
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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
- H02M1/36—Means for starting or stopping converters
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a soft start method of a three-phase Vienna power factor correction circuit, which comprises the following steps: (1) when the charging circuit is started, the bypass switch in the current limiting circuit is switched off, and the current limiting resistor limits the charging current within an allowable range; (2) the DSP digital controller does not output PWM pulses, and three-phase input voltage is rectified into direct current voltage by a diode and then charges a direct current side capacitor until the voltage of the capacitor is stable; (3) the sampling circuit collects three-phase input voltage, three-phase input current, feedback voltage and feedback current; (4) comparing the reference modulation wave with a digital triangular wave carrier wave by taking three-phase input voltage as a reference modulation wave, outputting a PWM pulse, controlling the output of the PWM pulse, and charging the voltage of a direct-current side capacitor to a given voltage; (5) when the voltage of the direct current side capacitor is larger than the given voltage, the direct current side capacitor is put into a PI digital controller, and the voltage control is switched into closed-loop control. The invention reduces the impact of starting current and the stress of the switch tube, and prolongs the service life of the device.
Description
Technical Field
The invention belongs to the digital power supply technology, and particularly relates to a soft start method of a three-phase Vienna power factor correction circuit.
Background
Before the three-phase VIERNA rectifier is electrified, the voltage of a direct-current side capacitor is 0, when the given voltage and the output feedback voltage have large deviation at the moment of electrification, if the voltage is not controlled, the impact current is large, the device can be damaged, and in order to restrain the starting impact current, the rectifier must be subjected to soft starting to enter a normal working mode when being started. The traditional analog power supply has continuous control signals, so that a special soft start circuit on hardware can ensure that the impact current is not too large when the system is started, and some digital power supplies are not designed with special hardware soft start circuits, so that the whole starting process needs software control to realize the soft start process, further the impact current is inhibited, and the system smoothly enters closed-loop control.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for realizing soft start of a three-phase Vienna power factor correction circuit without impact current in the whole soft start process.
The technical scheme is as follows: the invention discloses a soft start method of a three-phase Vienna power factor correction circuit, which comprises the following steps:
(1) the system is started, the DSP digital controller controls a bypass switch in the current limiting circuit to be switched off, and a current limiting resistor in the current limiting circuit limits the charging current within an allowable range;
(2) when the system is started, the DSP digital controller does not output PWM pulses, and three-phase input voltage is rectified into direct current voltage through the diode to charge a direct current side capacitor until the voltage of the capacitor is stable;
(3) the sampling circuit collects three-phase input voltage, three-phase input current, feedback voltage and feedback current;
(4) the DSP digital controller directly adopts the three-phase input voltage collected in the step (3) as a reference modulation wave, compares the reference modulation wave with a digital triangular wave carrier and outputs a PWM pulse, and the PWM pulse is processed by a driving circuit and drives a three-phase VIENNA main topology circuit to charge a direct current side capacitor and smoothly lift the capacitor voltage until the voltage is given;
(5) when the voltage of the direct current side capacitor is larger than the given voltage, a PI digital controller is put into the direct current side capacitor, and the voltage control is switched into closed-loop control.
In the step (1), the current limiting circuit comprises a current limiting resistor and a bypass switch which are connected in parallel, and the current limiting resistor and the bypass switch are connected in series with the charging loop after being connected in parallel.
In the step (2), in the current-limiting pre-charging process, the three-phase VIENNA main topology circuit is in an uncontrolled rectification mode.
In the step (2), the DSP digital controller judges the three-phase input voltage and the capacitor voltage, and closes the bypass switch when the three-phase input voltage is normal and the capacitor voltage is stable.
In the step (2), the DSP digital controller judges the three-phase input voltage and the capacitor voltage, when one of the three-phase input voltages is abnormal, the three-phase VIENNA main topology circuit keeps an uncontrolled rectification state, and a bypass switch in the current limiting circuit keeps a disconnection state.
In the step (4), before comparing the reference modulation wave with the digital triangular wave carrier, the amplitude of the reference modulation wave is finely adjusted, so that the reference modulation wave and the digital triangular wave carrier generate an intersection.
When the amplitude of the reference modulation wave is smaller, the intersection of the reference modulation wave and the digital triangular wave carrier is more, so that the number of the output PWM pulses is more, and the pulse width of the PWM pulses is larger; when the amplitude of the reference modulation wave is larger, the intersection of the reference modulation wave and the digital triangular wave carrier is smaller, so that the number of the output PWM pulses is smaller, and the pulse width of the PWM pulses is smaller.
The fine adjustment of the amplitude of the reference modulation wave is specifically to reduce the amplitude of the reference modulation wave in different time-sharing ways according to different slopes according to the requirement of the starting time.
In the step (4), when the digital triangular wave carrier is larger than the reference modulation wave, the PWM pulse outputs high level; conversely, the PWM pulse outputs a low level.
The digital triangular wave carrier is generated by a PWM module counter of the DSP digital controller.
Has the advantages that: compared with the prior art, the invention has the beneficial effects that: (1) the driving pulse generation in the soft start process is simple and convenient; (2) no impact current exists in the whole soft start process; (3) and after the soft start is finished, the closed-loop control can be smoothly started.
Drawings
FIG. 1 is a schematic diagram of a three-phase VIENNA rectifier according to the present invention;
fig. 2 is a schematic diagram of soft-start PWM wave generation in the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawing figures.
As shown in fig. 1, the hardware circuit of the present invention includes a current limiting circuit, a sampling circuit, and a digital control circuit, the current limiting circuit includes a current limiting resistor and a bypass switch connected in parallel, and the current limiting resistor and the bypass switch are connected in series to a charging loop after being connected in parallel. The invention discloses a soft start method of a three-phase Vienna power factor correction circuit, which comprises the following steps:
(1) the system is started, the DSP digital controller controls a switching tube in the three-phase VIENNA main topology circuit to be in a closed state, the DSP digital controller controls a bypass switch in the current limiting circuit to be switched off, the charging current is limited by a current limiting resistor in the current limiting circuit, the starting current is limited within an allowable range, and a direct current side capacitor is pre-charged after the current is limited; in the current-limiting pre-charging process, the three-phase VIENNA main topology circuit is in an uncontrolled rectification mode.
(2) When the system is started, the DSP digital controller does not output PWM pulses, and three-phase input voltage is rectified into direct current voltage through the diode to charge a direct current side capacitor until the voltage of the capacitor is stable;
the DSP digital controller collects the feedback voltage of the capacitor at the direct current side, judges whether the capacitor voltage is equal to 1.732 times of the effective value of the input voltage, judges whether the three-phase input voltage is normal when the capacitor voltage is stabilized near the voltage, and closes the bypass switch when the three-phase input voltage is normal. When one of the three-phase input voltages is abnormal, the three-phase VIENNA main topology circuit keeps an uncontrolled rectification state, and a bypass switch in the current limiting circuit keeps an off state.
(3) The sampling circuit collects three-phase input voltage, three-phase input current, feedback voltage and feedback current;
(4) and (3) directly adopting the three-phase input voltage acquired in the step (3) as a reference modulation wave by the DSP digital controller, comparing the reference modulation wave with a digital triangular wave carrier and then outputting a PWM pulse, generating a switching pulse signal required by soft start, and realizing the function of slowly increasing the capacitor voltage without impulse current. The output PWM pulse is processed by the driving circuit and drives the three-phase VIENNA main topology circuit to charge the direct current side capacitor, and the voltage of the capacitor is smoothly raised until the voltage is given; as shown in fig. 2, when the digital triangular wave carrier is larger than the reference modulation wave, the PWM pulse outputs a high level; conversely, the PWM pulse outputs a low level.
Before comparing the reference modulation wave with the digital triangular wave carrier wave, the amplitude of the reference modulation wave is finely adjusted, so that the reference modulation wave and the digital triangular wave carrier wave generate intersection. The fine adjustment of the amplitude of the reference modulation wave is specifically that the amplitude of the reference modulation wave is reduced according to different slopes in a time-sharing manner according to the requirement of the starting time.
When the amplitude of the reference modulation wave is smaller, the intersection of the reference modulation wave and the digital triangular wave carrier is more, so that the number of the output PWM pulses is more, and the pulse width of the PWM pulses is larger; the larger the amplitude of the reference modulated wave is, the less the intersection of the reference modulated wave and the digital triangular carrier wave is, and thus the smaller the number of output PWM pulses and the smaller the pulse width of the PWM pulse is.
(5) When the voltage of the direct current side capacitor is larger than the given voltage, a PI digital controller is put into the direct current side capacitor, and the voltage control is switched into closed-loop control.
The three-phase VIENNA circuit is a boost circuit, and when a switching tube is opened, a direct current side capacitor is charged. Therefore, in order to suppress the rush current, the PWM pulse is initially as small as possible, and the pulse width is as small as possible. As shown in fig. 2, as the amplitude of the reference modulated wave is larger, the intersection of the reference modulated wave and the digital triangular carrier wave is smaller, and the width of the pulse is smaller according to the output manner of the PWM in step (4).
In step (4), the amplitude of the three-phase input voltage used by the reference modulation wave is large, and in order to accelerate the start-up time, the scale factor for reducing the amplitude of the reference modulation wave is 0.05 at the beginning, and the generated PWM wave is as shown in fig. 2 when U is asirnt. It can be seen that only around 0, 180, 360 degrees of a complete cycle will be pulsed. After the pulse lasts for a period of time, the amplitude of the modulated wave is reduced again, so that the modulated wave and the carrier wave generate more intersections, and thus, more pulses with wider pulse width are output, such as the waveform when U is Bsinwt in FIG. 2; and repeating the operation of reducing the amplitude of the modulation wave until the reduction scale factor is the reciprocal of the given voltage, namely when the voltage of the direct current side capacitor is the given voltage, ending the soft start process, and then entering PI closed loop regulation.
Claims (10)
1. A method for soft start of a three-phase Vienna power factor correction circuit is characterized by comprising the following steps:
(1) the system is started, the DSP digital controller controls a bypass switch in the current limiting circuit to be switched off, and a current limiting resistor in the current limiting circuit limits the charging current within an allowable range;
(2) when the system is started, the DSP digital controller does not output PWM pulses, and three-phase input voltage is rectified into direct current voltage through the diode to charge a direct current side capacitor until the voltage of the capacitor is stable;
(3) the sampling circuit collects three-phase input voltage, three-phase input current, feedback voltage and feedback current;
(4) the DSP digital controller directly adopts the three-phase input voltage acquired in the step (3) as a reference modulation wave, compares the reference modulation wave with a digital triangular wave carrier and outputs a PWM pulse, and the PWM pulse is processed by a driving circuit and drives a three-phase VIENNA main topology circuit to charge a direct current side capacitor and smoothly raise the voltage of the capacitor until the voltage is given;
(5) when the voltage of the direct current side capacitor is larger than the given voltage, a PI digital controller is put into the direct current side capacitor, and the voltage control is switched into closed-loop control.
2. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (1), the current limiting circuit comprises a current limiting resistor and a bypass switch which are connected in parallel, and the current limiting resistor and the bypass switch are connected in series with the charging loop after being connected in parallel.
3. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (2), in the current-limiting pre-charging process, the three-phase VIENNA main topology circuit is in an uncontrolled rectification mode.
4. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (2), the DSP digital controller judges the three-phase input voltage and the capacitor voltage, and closes the bypass switch when the three-phase input voltage is normal and the capacitor voltage is stable.
5. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (2), the DSP digital controller judges the three-phase input voltage and the capacitor voltage, when one of the three-phase input voltages is abnormal, the three-phase VIENNA main topology circuit keeps an uncontrolled rectification state, and a bypass switch in the current limiting circuit keeps a disconnection state.
6. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (4), before comparing the reference modulation wave with the digital triangular wave carrier, the amplitude of the reference modulation wave is finely adjusted, so that the reference modulation wave and the digital triangular wave carrier generate an intersection.
7. The method of soft-starting a three-phase vienna power factor correction circuit of claim 6, wherein: when the amplitude of the reference modulation wave is smaller, the intersection of the reference modulation wave and the digital triangular wave carrier is more, so that the number of the output PWM pulses is more, and the pulse width of the PWM pulses is larger; when the amplitude of the reference modulation wave is larger, the intersection of the reference modulation wave and the digital triangular wave carrier is smaller, so that the number of the output PWM pulses is smaller, and the pulse width of the PWM pulses is smaller.
8. The method of soft-starting a three-phase vienna power factor correction circuit of claim 6, wherein: the fine adjustment of the amplitude of the reference modulation wave is specifically to reduce the amplitude of the reference modulation wave in different time-sharing ways according to different slopes according to the requirement of the starting time.
9. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: in the step (4), when the digital triangular wave carrier is larger than the reference modulation wave, the PWM pulse outputs high level; conversely, the PWM pulse outputs a low level.
10. The method of soft-starting a three-phase vienna power factor correction circuit of claim 1, wherein: the digital triangular wave carrier is generated by a PWM module counter of the DSP digital controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010341732.2A CN111555601A (en) | 2020-04-27 | 2020-04-27 | Soft start method of three-phase Vienna power factor correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010341732.2A CN111555601A (en) | 2020-04-27 | 2020-04-27 | Soft start method of three-phase Vienna power factor correction circuit |
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| Publication Number | Publication Date |
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| CN111555601A true CN111555601A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010341732.2A Withdrawn CN111555601A (en) | 2020-04-27 | 2020-04-27 | Soft start method of three-phase Vienna power factor correction circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113726196A (en) * | 2021-09-01 | 2021-11-30 | 漳州科华电气技术有限公司 | Midpoint balance control method and device of Vienna rectification circuit in power supply and terminal |
-
2020
- 2020-04-27 CN CN202010341732.2A patent/CN111555601A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113726196A (en) * | 2021-09-01 | 2021-11-30 | 漳州科华电气技术有限公司 | Midpoint balance control method and device of Vienna rectification circuit in power supply and terminal |
| CN113726196B (en) * | 2021-09-01 | 2023-08-18 | 漳州科华电气技术有限公司 | Midpoint balance control method, device and terminal of Vienna rectifying circuit in power supply |
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Application publication date: 20200818 |
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| WW01 | Invention patent application withdrawn after publication |