CN114172355B - Ripple reduction circuit and coating power supply based on input feedforward and loop control - Google Patents
Ripple reduction circuit and coating power supply based on input feedforward and loop control Download PDFInfo
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- CN114172355B CN114172355B CN202111352510.1A CN202111352510A CN114172355B CN 114172355 B CN114172355 B CN 114172355B CN 202111352510 A CN202111352510 A CN 202111352510A CN 114172355 B CN114172355 B CN 114172355B
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- 230000009467 reduction Effects 0.000 title claims abstract description 28
- 239000011248 coating agent Substances 0.000 title description 7
- 238000000576 coating method Methods 0.000 title description 7
- 230000008878 coupling Effects 0.000 claims abstract description 97
- 238000010168 coupling process Methods 0.000 claims abstract description 97
- 238000005859 coupling reaction Methods 0.000 claims abstract description 97
- 238000001914 filtration Methods 0.000 claims abstract description 56
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 97
- 238000005070 sampling Methods 0.000 claims description 27
- 238000004146 energy storage Methods 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000010363 phase shift Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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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
- H02M1/14—Arrangements for reducing ripples from dc 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1588—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load comprising at least one synchronous rectifier element
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application relates to a ripple reduction circuit based on input feedforward and loop control. The circuit comprises: the device comprises a rectifier, a voltage loop control circuit, a filtering phase-shifting amplitude limiting circuit and a boost circuit; the output end of the rectifier is connected with the input end of the filtering phase-shifting amplitude limiting circuit; the first coupling voltage output by the voltage ring control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit, so that a coupling voltage signal is obtained; processing the coupled voltage signal by a current loop controller to obtain a dynamic voltage signal; the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit; the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit; the output end of the current loop controller is connected with the pulse width modulation signal generator. The scheme of the application can inhibit low-frequency ripple, is beneficial to the system to realize ultrahigh-speed response, realizes high-performance requirements, and avoids the condition of damaging electric equipment at the rear end.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to a ripple reduction circuit based on input feedforward and loop control and a film coating power supply.
Background
The control strategy of the conventional semiconductor coating power supply and the conventional photovoltaic coating power supply is that the AC is rectified into DC+isolation voltage regulation type pulse output, or the PFC circuit+isolation voltage regulation type pulse output is used, so that external alternating current is rectified by a rectifier and then outputs direct current voltage with low-frequency ripples of 100Hz or 300Hz and the like, the power efficiency is reduced, harmonic waves are easily generated on rear-end electric equipment, and the rear-end electric equipment is damaged.
In the prior art, in the patent with publication number CN108512451B (low-frequency ripple suppression digital control device of flyback micro-inverter based on power prediction), it is proposed that the control object of the digital control device is a flyback photovoltaic micro-inverter, the digital control device obtains the modulation ratio of the flyback converter by adopting a power prediction modulation ratio calculation module, so that the output power of the flyback converter is equal to an expected value, thereby suppressing the low-frequency ripple in the output current of the photovoltaic cell, and a thin film capacitor with smaller capacitance value can be adopted to prolong the service life of the photovoltaic micro-inverter.
The above prior art has the following disadvantages:
the cost is very high due to the addition of a digital chip, a 3.3V power supply circuit and the like. The digital control real-time performance is very poor, low frequency can be restrained, but the loop bandwidth of the power supply is far lower than that of a loop designed by using an analog chip, and the quick input or output dynamic response is not timely.
Disclosure of Invention
In order to overcome the problems in the related art, the application provides the ripple reduction circuit based on the input feedforward and the loop control, which can inhibit low-frequency ripple, realize high dynamic response, improve power efficiency and avoid the conditions that rear-end electric equipment generates harmonic waves and damages the rear-end electric equipment.
A first aspect of the present application provides a ripple reduction circuit based on input feedforward and loop control, comprising:
the device comprises a rectifier, a voltage loop control circuit, a filtering phase-shifting amplitude limiting circuit and a boost circuit;
the output end of the rectifier is connected with the input end of the filtering phase-shifting amplitude limiting circuit;
the first coupling voltage output by the voltage ring control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit, so that a coupling voltage signal is obtained;
the coupling voltage signal is processed by a current loop controller to obtain a dynamic voltage signal, the current loop controller is a controller for carrying out harmonic processing on the coupling voltage signal, the harmonic processing is to compare a sampling current with a reference current to obtain a harmonic proportion, the coupling voltage signal is multiplied by the harmonic proportion to be harmonic to obtain the dynamic voltage signal, the sampling current is a current obtained by collecting an input current of a booster circuit, and the reference current is a current output by the voltage loop control circuit;
the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit; the differential extraction circuit, the filtering phase-shifting circuit, the amplitude limiting circuit and the filtering phase-shifting coupling circuit are electrically connected in sequence to inhibit the amplitude of low-frequency ripple;
the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit, and is used for converting the difference voltage of the target output voltage and the sampling voltage into a first coupling voltage, wherein the sampling voltage is obtained by collecting the output voltage of the booster circuit;
the output end of the current loop controller is connected with the pulse width modulation signal generator, and the output end of the pulse width modulation signal generator is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, so that the booster circuit can be switched between a synchronous rectification mode and an asynchronous rectification mode, and the MOS tube Q1 and the MOS tube Q2 cannot be conducted simultaneously.
In one embodiment, the differential extraction circuit includes a resistor R1 and a capacitor C2, the resistor R1 and the capacitor C2 being connected in series;
the resistor R1 is connected with the rectifier;
the filtering phase-shifting circuit comprises a resistor R3, a resistor R4 and a capacitor C3;
the resistor R3 is connected with the capacitor C2 in series, and the resistor R4 is connected with the resistor R3 in series;
resistor R4 and capacitor C3 are connected in parallel.
In one embodiment, the clipping circuit includes a regulator tube D3 and a regulator tube D4;
the positive electrode of the voltage stabilizing tube D3 is connected in series with the positive electrode of the voltage stabilizing tube D4;
the branch of the voltage stabilizing tube D3 connected in series with the voltage stabilizing tube D4 is connected in parallel with the capacitor C3.
In one embodiment, the filtering phase-shifting coupling circuit includes a coupling capacitor C4, a capacitor C5, a capacitor C6, a resistor R5, a resistor R6, a resistor R7, a diode D5, and a diode D6;
the coupling capacitor C4 is connected in series with the resistor R3;
the capacitor C5, the resistor R6 and the resistor R7 are sequentially connected in series;
the capacitor C6, the diode D5 and the diode D6 are sequentially connected in series;
a branch circuit of which the capacitor C5, the resistor R6 and the resistor R7 are sequentially connected in series is connected in parallel with a branch circuit of which the capacitor C6, the diode D5 and the diode D6 are sequentially connected in series;
the resistor R5 is connected with the capacitor C6 in parallel;
a first node is arranged between the resistor R6 and the resistor R7, a second node is arranged between the diode D5 and the diode D6, and the first node and the second node are connected through a wire.
In one embodiment, the voltage loop coupling circuit includes a coupling resistor R8, a resistor R9, a resistor R10, a capacitor C7, a capacitor C8, a storage capacitor C9, a diode D7, and a diode D8;
the coupling resistor R8 is connected in series with the coupling capacitor C4;
the resistor R9 and the capacitor C7 are connected in series;
the capacitor C8 and the resistor R10 are connected in series;
a branch circuit of which the resistor R9 and the capacitor C7 are connected in series is connected in parallel with a branch circuit of which the capacitor C8 and the resistor R10 are connected in series;
a diode D7 and a diode D8 are connected in series, and a branch of the series connection of the diode D7 and the diode D8 is connected in parallel with a resistor R10;
the energy storage capacitor C9 is connected in parallel with the branch in which the capacitor C8 and the resistor R10 are connected in series.
In one embodiment, the voltage loop controller converts the differential voltage into a differential current source, which is connected to the energy storage capacitor C9;
the differential current source is converted into a first coupling voltage after being processed by the voltage loop coupling circuit, so that the first coupling voltage can charge the energy storage capacitor C9, and the energy storage capacitor C9 can output reference current.
In one embodiment of the present application, in one embodiment,
the dynamic voltage signal is input to a pulse width modulation signal generator, which comprises: the MOS transistor driving circuit comprises a comparator T1, an MOS transistor driving circuit and a pulse width modulation signal generating circuit;
the pulse width modulation signal generation circuit is used for outputting triangular waves;
the comparator T1 is used for comparing the dynamic voltage signal with the amplitude of the triangular wave, and outputting a high level when the amplitude of the dynamic voltage signal is larger than the amplitude of the triangular wave; when the amplitude of the dynamic voltage signal is smaller than that of the triangular wave, outputting a low level;
the output end of the MOS tube driving circuit is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, and when the high level is output, the MOS tube Q2 is in a working state; when the output is low, the MOS transistor Q1 is in a working state.
In one embodiment, the comparator T1 comprises a positive input and a negative input;
the dynamic voltage signal is input by the positive electrode input end, and the triangular wave is input by the negative electrode input end;
the high level output end is connected with the MOS tube Q2, and the low level output end is connected with the MOS tube Q1.
In one embodiment, the boost circuit includes an inductor L1, a diode D2, a capacitor C1, a MOS transistor Q1, and a MOS transistor Q2;
the inductor L1 is connected with the rectifier, and the inductor L1 is connected with the diode D1 in series;
the MOS tube Q2, the diode D2 and the capacitor C1 are sequentially connected with the rectifier in parallel;
the MOS tube Q1 is connected with the diode D1 in parallel;
the capacitor C1 is connected with the rear-end electric equipment.
A second aspect of the present application provides a plating power supply comprising:
a ripple reduction circuit based on input feed forward and loop control as claimed in any one of the preceding claims.
The technical scheme provided by the application can comprise the following beneficial effects:
the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit, wherein the differential extraction circuit, the filtering phase-shifting circuit, the amplitude limiting circuit and the filtering phase-shifting coupling circuit are sequentially and electrically connected, so that high-frequency components in low-frequency ripples in direct-current voltage output after rectification by a rectifier are filtered and inhibited, the amplitude of the low-frequency ripples is inhibited, the amplitude limiting circuit limits the amplitude of signals extracted by the differential extraction circuit, the condition that the circuit is damaged due to overlarge signal amplitude extracted by the differential extraction circuit is avoided, and the normal operation of the circuit is ensured; the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit, and is used for converting the difference voltage between the target output voltage and the sampling voltage into a first coupling voltage, so that the difference voltage between the target output voltage and the sampling voltage is converted into a voltage signal, and meanwhile, the sampling voltage is monitored, and the first coupling voltage is adjusted in time; the first coupling voltage output by the voltage loop control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit, the coupling voltage signal is processed by the current loop controller, the coupling voltage signal can be subjected to harmonic multiplication by a harmonic proportion to obtain a dynamic voltage signal, meanwhile, the input current of the booster circuit is monitored, the harmonic proportion is determined, so that the output amplitude of the booster circuit is controlled, and the stability and the reliability of the booster circuit are ensured; the output end of the current loop controller is connected with the pulse width modulation signal generator, and the output end of the pulse width modulation signal generator is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, so that the booster circuit can be switched between a synchronous rectification mode and an asynchronous rectification mode, the MOS tube Q1 and the MOS tube Q2 cannot be conducted simultaneously, damage to rear-end electric equipment is prevented, power supply efficiency is improved, harmonic wave generated by the rear-end electric equipment is avoided, and damage to the rear-end electric equipment is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic diagram of a ripple reduction circuit based on input feedforward and loop control, shown in an embodiment of the present application;
fig. 2 is a schematic diagram of a structure in which a voltage loop control circuit and a filtering phase-shifting clipping circuit are coupled in a ripple reduction circuit based on input feedforward and loop control according to an embodiment of the present application.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
The control strategy of the conventional semiconductor coating power supply and the conventional photovoltaic coating power supply is that the AC is rectified into DC+isolation voltage regulation type pulse output, or the PFC circuit+isolation voltage regulation type pulse output is used, so that external alternating current is rectified by a rectifier and then outputs direct current voltage with low-frequency ripples of 100Hz or 300Hz and the like, the power efficiency is reduced, harmonic waves are easily generated on rear-end electric equipment, and the rear-end electric equipment is damaged. The prior art cannot realize ultra-high new performance dynamic response in the process of suppressing low-frequency ripple waves, and cannot solve the problem of chip damage caused by overlarge signal amplitude extracted by a differential extraction circuit in filtering phase shift processing.
Aiming at the problems, the embodiment of the application provides a ripple reduction circuit based on input feedforward and loop control, which can inhibit low-frequency ripple, is beneficial to the system to realize ultrahigh-speed response, realizes high-performance requirements, improves power efficiency, and avoids the situation that rear-end electric equipment generates harmonic waves and damages the rear-end electric equipment.
The following describes the technical scheme of the embodiment of the present application in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, an embodiment of a ripple reduction circuit based on input feedforward and loop control according to an embodiment of the present application includes:
the device comprises a rectifier, a voltage loop control circuit, a filtering phase-shifting amplitude limiting circuit and a boost circuit;
the output end of the rectifier is connected with the input end of the filtering phase-shifting amplitude limiting circuit, after the external alternating current, namely the AC voltage in fig. 1 and 2, is input into the rectifier to be rectified, the output direct current voltage can have low-frequency ripple waves, the external alternating current is rectified, the rectification processing method is generally absolute value processing, the direct current can become direct current with a frequency multiplication relation after rectification, the ripple wave amplitude is from 0V to 220 x 1.414V or from 0V to 380 x 1.414V, the ripple wave is too large, the rectified direct current voltage is not usable, if capacitive filtering is added, the peak value of 220 x 1.414V or 380 x 1.414V can be output by the filtering circuit when no load is needed, the output voltage of the filtering circuit can be fluctuated back and forth within the voltage range of 280V-220 x 1.414V to 500V-380 x 1.414V, the ripple wave frequency is in the frequency multiplication relation with the external alternating current, and therefore the ripple wave frequency is generally about 100Hz to 300Hz, and the ripple wave is called low-frequency ripple wave.
The filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit; the differential extraction circuit, the filtering phase-shifting circuit, the amplitude limiting circuit and the filtering phase-shifting coupling circuit are electrically connected in sequence to inhibit the amplitude of low-frequency ripple. The ripple wave extraction circuit with the differential extraction characteristic, namely the differential extraction circuit, extracts ripple wave factors, in the actual working process, the ripple wave extraction circuit not only extracts low-frequency ripple waves, but also introduces higher-frequency fluctuation in the input direct-current voltage into the circuit, so that the high-frequency interference needs to be filtered and suppressed by the filtering phase-shifting circuit, and the amplitude range of the input signal is unknown, if the amplitude of the signal extracted by the differential extraction circuit is overlarge and is coupled into the circuit, the circuit is damaged and invalid, therefore, in order to avoid the problem, a limiting circuit is needed to be added for amplitude limiting, the signal is controlled in the range which can be born by the circuit by the limiting circuit, the circuit is ensured to work normally, and after the processing of the filtering phase-shifting coupling circuit, the filtering phase-shifting limiting circuit can output a second coupling voltage.
The voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit, wherein the voltage loop control circuit is used for converting the difference voltage between the target output voltage and the sampling voltage into a first coupling voltage, converting the difference voltage between the target output voltage and the sampling voltage into a voltage signal, monitoring the sampling voltage and timely adjusting the first coupling voltage, and the sampling voltage is obtained by collecting the output voltage of the voltage boosting circuit. Therefore, the first coupling voltage output by the voltage loop control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit, and a coupling voltage signal is obtained.
The coupling voltage signal is processed by a current loop controller to obtain a dynamic voltage signal, the current loop controller is a controller for carrying out harmonic processing on the coupling voltage signal, the harmonic processing is to compare a sampling current with a reference current to obtain a harmonic proportion, the coupling voltage signal is multiplied by the harmonic proportion to be harmonic, the dynamic voltage signal is obtained, the sampling current is a current obtained by collecting an input current of a booster circuit, and the reference current is a current output by the voltage loop control circuit.
The output end of the current loop controller is connected with the pulse width modulation signal generator, and the output end of the pulse width modulation signal generator is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, so that the booster circuit can be switched between a synchronous rectification mode and an asynchronous rectification mode, and the MOS tube Q1 and the MOS tube Q2 cannot be conducted simultaneously. When the pulse width modulation signal generator outputs a high level, the MOS tube Q2 is high level, the MOS tube Q1 is low level, at the moment, the MOS tube Q2 works and the MOS tube Q1 does not work, and the working mode is an asynchronous rectification mode; when the pulse width modulation signal generator outputs a low level, the MOS transistor Q1 is high level, the MOS transistor Q2 is low level, at the moment, the MOS transistor Q2 does not work, the MOS transistor Q1 works, and the working mode is synchronous rectification mode.
From the first embodiment, the following advantages can be seen:
the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit, wherein the differential extraction circuit, the filtering phase-shifting circuit, the amplitude limiting circuit and the filtering phase-shifting coupling circuit are sequentially and electrically connected, so that high-frequency components in low-frequency ripples in direct-current voltage output after rectification by a rectifier are filtered and inhibited, the amplitude of the low-frequency ripples is inhibited, the amplitude limiting circuit limits the amplitude of signals extracted by the differential extraction circuit, the condition that the circuit is damaged due to overlarge signal amplitude extracted by the differential extraction circuit is avoided, and the normal operation of the circuit is ensured; the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit, and is used for converting the difference voltage between the target output voltage and the sampling voltage into a first coupling voltage, so that the difference voltage between the target output voltage and the sampling voltage is converted into a voltage signal, and meanwhile, the sampling voltage is monitored, and the first coupling voltage is adjusted in time; the first coupling voltage output by the voltage loop control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit, the coupling voltage signal is processed by the current loop controller, the coupling voltage signal can be subjected to harmonic multiplication by a harmonic proportion to obtain a dynamic voltage signal, meanwhile, the input current of the booster circuit is monitored, the harmonic proportion is determined, so that the output amplitude of the booster circuit is controlled, and the stability and the reliability of the booster circuit are ensured; the output end of the current loop controller is connected with the pulse width modulation signal generator, and the output end of the pulse width modulation signal generator is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, so that the booster circuit can be switched between a synchronous rectification mode and an asynchronous rectification mode, the MOS tube Q1 and the MOS tube Q2 cannot be conducted simultaneously, damage to rear-end electric equipment is prevented, power supply efficiency is improved, harmonic wave generated by the rear-end electric equipment is avoided, and damage to the rear-end electric equipment is avoided.
Example two
For ease of understanding, one embodiment of a ripple reduction circuit based on input feed forward and loop control is provided below for illustration, and in practice, the circuit coupling the voltage loop control circuit and the filtered phase-shifting clipping circuit is further designed.
Referring to fig. 2, an embodiment of a ripple reduction circuit based on input feedforward and loop control according to an embodiment of the present application includes:
the differential extraction circuit comprises a resistor R1 and a capacitor C2, the resistor R1 and the capacitor C2 are connected in series, and the resistor R1 is connected with the positive electrode output end of the rectifier.
The filtering phase-shifting circuit comprises a resistor R3, a resistor R4 and a capacitor C3, wherein the resistor R3 is connected with the capacitor C2 in series, and the resistor R4 is connected with the resistor R3 in series and connected with the resistor R4 and the capacitor C3 in parallel.
The amplitude limiting circuit comprises a voltage stabilizing tube D3 and a voltage stabilizing tube D4, the positive electrode of the voltage stabilizing tube D3 is connected with the positive electrode of the voltage stabilizing tube D4 in series, and a branch circuit of the voltage stabilizing tube D3 connected with the voltage stabilizing tube D4 in series is connected with a capacitor C3 in parallel.
The filtering phase-shifting coupling circuit comprises a coupling capacitor C4, a capacitor C5, a capacitor C6, a resistor R5, a resistor R6, a resistor R7, a diode D5 and a diode D6, wherein the coupling capacitor C4 is connected with the resistor R3 in series, the capacitor C5, the resistor R6 and the resistor R7 are sequentially connected in series, the capacitor C6, the diode D5 and the diode D6 are sequentially connected in series, the branch of the capacitor C5, the resistor R6 and the resistor R7 which are sequentially connected in series is connected in parallel with the branch of the capacitor C6, the diode D5 and the diode D6 which are sequentially connected in series, the resistor R5 is connected in parallel with the capacitor C6, a first node is arranged between the resistor R6 and the resistor R7, a second node is arranged between the diode D5 and the diode D6, and the first node is connected through a wire. The diode D5 and the diode D6 also have clipping effects to limit the influence of the large signal on the subsequent stage circuit.
The voltage loop coupling circuit comprises a coupling resistor R8, a resistor R9, a resistor R10, a capacitor C7, a capacitor C8, an energy storage capacitor C9, a diode D7 and a diode D8, wherein the coupling resistor R8 is connected with the coupling capacitor C4 in series, the resistor R9 is connected with the capacitor C7 in series, the capacitor C8 is connected with the resistor R10 in series, the resistor R9 is connected with the branch circuit of the capacitor C7 in series, the branch circuit of the capacitor C8 is connected with the resistor R10 in parallel, the diode D7 is connected with the diode D8 in series, the branch circuit of the diode D7 and the diode D8 are connected with the resistor R10 in parallel, and the energy storage capacitor C9 is connected with the branch circuit of the capacitor C8 and the resistor R10 in series in parallel. The diode D7 and the diode D8 also have amplitude limiting function and are used for limiting the influence of the overall circuit operation caused by overlarge change of the output amplitude of the controller and abrupt change of the current reference value when the signal amplitude is overlarge.
It should be understood that the above description of the circuit structures of the differential extraction circuit, the filter phase-shifting circuit, the limiter circuit and the filter phase-shifting coupling circuit is merely exemplary, and in practical applications, the circuit structures of the differential extraction circuit, the filter phase-shifting circuit, the limiter circuit and the filter phase-shifting coupling circuit are various, and the circuit structures of the circuits need to be determined according to practical application conditions, which is not limited herein.
The voltage ring controller converts the differential voltage into a differential current source, the differential current source is connected with the energy storage capacitor C9, the differential current source is converted into a first coupling voltage after being processed by the voltage ring coupling circuit, the first coupling voltage can charge the energy storage capacitor C9, the energy storage capacitor C9 can output a reference current, it is understood that the differential voltage can represent the difference between the target output voltage and the sampling voltage, the sampling voltage is actually sampling the actually output voltage, therefore, the difference between the actually output voltage and the target output voltage can be represented, the differential voltage is converted into the differential current source, the differential current source is connected with the energy storage capacitor C9, the differential current source is converted into the first coupling voltage after being processed by the voltage ring coupling circuit, the first coupling voltage can charge the energy storage capacitor C9, the reference current provided by the energy storage capacitor C9 can be compared with the sampling current, the proportional relation between the reference current and the sampling current can be obtained, the proportional relation between the reference current and the sampling current can be determined by dividing the sampling current, and the only limited, and the first harmonic voltage can be obtained, and the first harmonic voltage can be dynamically output.
Example III
For ease of understanding, the following description provides an embodiment of a ripple reduction circuit based on input feedforward and loop control, and in practical application, the operation mode of the boost circuit is determined by the pwm signal generator, so that the MOS transistor Q1 and the MOS transistor Q2 in the boost circuit are prevented from being turned on simultaneously, which causes damage to the back-end electric equipment.
Referring to fig. 1, a third embodiment of a ripple reduction circuit based on input feedforward and loop control according to the present application includes:
the dynamic voltage signal is input to a pulse width modulation signal generator, which comprises: the MOS transistor driving circuit comprises a comparator T1, an MOS transistor driving circuit and a pulse width modulation signal generating circuit;
the pulse width modulation signal generation circuit is used for outputting triangular waves;
the comparator T1 is used for comparing the dynamic voltage signal with the amplitude of the triangular wave, and outputting a high level when the amplitude of the dynamic voltage signal is larger than the amplitude of the triangular wave; when the amplitude of the dynamic voltage signal is smaller than that of the triangular wave, outputting a low level;
the output end of the MOS tube driving circuit is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, and when the high level is output, the MOS tube Q2 is in a working state; when the output is low, the MOS transistor Q1 is in a working state. The loop bandwidth cannot be fast enough, so pure loop control can only partially suppress the input low frequency ripple, and more suppression is desired, requiring feed forward and loop control coupling. Accordingly, simple feed forward of the boost circuit also does not achieve full ripple suppression. Therefore, when the input voltage is increased, the coupling voltage reduces the reference value of the current loop, and finally reduces the turn-on time of Q2 and reduces the output voltage; when the input voltage is reduced, the coupling voltage increases the reference value of the current loop, and finally increases the turn-on time of Q2, thereby increasing the output voltage. By this balancing measure, suppression of input ripple is achieved. It can be understood that when the pwm signal generator outputs a high level, the MOS transistor Q2 is at a high level, the MOS transistor Q1 is at a low level, and at this time, the MOS transistor driving circuit drives the MOS transistor Q2 to operate while the MOS transistor Q1 does not operate, and the operating mode is a non-synchronous rectification mode; when the pulse width modulation signal generator outputs a low level, the MOS transistor Q1 is high level, the MOS transistor Q2 is low level, and at the moment, the MOS transistor driving circuit drives the MOS transistor Q2 to work and the MOS transistor Q1 to work, and the working mode is synchronous rectification mode.
Dead zone is generated in the pulse width modulation signal generating circuit, and the dead zone is the dead zone when the upper half bridge of the pulse width modulation signal generating circuit is closed, and the lower half bridge is opened after a period of time delay or the upper half bridge is opened after the lower half bridge is closed after a period of time delay, so that the power element is prevented from being burnt, and the delay time is the dead zone. In the embodiment of the present application, the dead zone is used for closing the MOS transistor Q2 for a period of time, that is, the duration of the dead zone, when the MOS transistor Q1 is turned on to off, and then opening the MOS transistor Q2; similarly, when the MOS transistor Q2 is turned on or off, the MOS transistor Q1 is turned off for a period of time, i.e. the duration of the dead zone, and then turned on again, so as to prevent the circuit from being damaged.
The boost circuit comprises an inductor L1, a diode D2, a capacitor C1, a MOS tube Q1 and a MOS tube Q2, wherein the inductor L1 is connected with the positive output end of a rectifier, the inductor L1 is connected with the diode D1 in series, the MOS tube Q2, the diode D2 and the capacitor C1 are sequentially connected with the rectifier in parallel, the MOS tube Q1 is connected with the diode D1 in parallel, the capacitor C1 is connected with rear-end electric equipment, and the boosted stable voltage is output for the rear-end electric equipment.
Example IV
Corresponding to the embodiment of the application function implementation method, the application also provides a film coating power supply and a corresponding embodiment.
The coating power supply shown in the embodiment of the application comprises:
the ripple reduction circuit based on input feedforward and loop control as described in any of the above embodiments.
The ripple reduction circuit based on the input feedforward and the loop control in the above-described embodiment, in which the respective parts have been described in detail in the embodiment related to the ripple reduction circuit based on the input feedforward and the loop control, will not be described in detail here.
The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments. Those skilled in the art will also appreciate that the acts and modules referred to in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined and pruned according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided and pruned according to actual needs.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A ripple reduction circuit based on input feed forward and loop control, comprising:
the device comprises a rectifier, a voltage loop control circuit, a filtering phase-shifting amplitude limiting circuit and a boost circuit;
the output end of the rectifier is connected with the input end of the filtering phase-shifting amplitude limiting circuit;
the first coupling voltage output by the voltage loop control circuit is coupled with the second coupling voltage output by the filtering phase-shifting amplitude limiting circuit to obtain a coupling voltage signal;
processing the coupling voltage signal by a current loop controller to obtain a dynamic voltage signal, wherein the current loop controller is a controller for carrying out harmonic processing on the coupling voltage signal, the harmonic processing is to compare a sampling current with a reference current to obtain a harmonic proportion, the coupling voltage signal is multiplied by the harmonic proportion to carry out harmonic processing to obtain the dynamic voltage signal, the sampling current is a current obtained by collecting an input current of the voltage boosting circuit, and the reference current is a current output by the voltage loop control circuit;
the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit; the differential extraction circuit, the filtering phase-shifting circuit, the amplitude limiting circuit and the filtering phase-shifting coupling circuit are electrically connected in sequence to inhibit the amplitude of low-frequency ripple;
the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit, and is used for converting the difference voltage between a target output voltage and a sampling voltage into the first coupling voltage, wherein the sampling voltage is obtained by collecting the output voltage of the booster circuit; the voltage loop controller converts the differential voltage into a differential current source, and the differential current source is converted into the first coupling voltage after being processed by the voltage loop coupling circuit;
the output end of the current loop controller is connected with a pulse width modulation signal generator, and the output end of the pulse width modulation signal generator is respectively connected with a MOS tube Q1 and a MOS tube Q2 in the boost circuit, so that the boost circuit can be switched between a synchronous rectification mode and a non-synchronous rectification mode, and the MOS tube Q1 and the MOS tube Q2 cannot be conducted simultaneously.
2. The ripple reduction circuit of claim 1, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the differential extraction circuit comprises a resistor R1 and a capacitor C2, wherein the resistor R1 and the capacitor C2 are connected in series;
the resistor R1 is connected with the rectifier;
the filtering phase-shifting circuit comprises a resistor R3, a resistor R4 and a capacitor C3;
the resistor R3 is connected with the capacitor C2 in series, and the resistor R4 is connected with the resistor R3 in series;
the resistor R4 and the capacitor C3 are connected in parallel.
3. The ripple reduction circuit of claim 2, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the amplitude limiting circuit comprises a voltage stabilizing tube D3 and a voltage stabilizing tube D4;
the positive electrode of the voltage stabilizing tube D3 is connected in series with the positive electrode of the voltage stabilizing tube D4;
the branch of the voltage stabilizing tube D3 connected in series with the voltage stabilizing tube D4 is connected in parallel with the capacitor C3.
4. The ripple reduction circuit of claim 3, wherein the input feed forward and loop control based circuit is configured to,
the filtering phase-shifting coupling circuit comprises a coupling capacitor C4, a capacitor C5, a capacitor C6, a resistor R5, a resistor R6, a resistor R7, a diode D5 and a diode D6;
the coupling capacitor C4 is connected with the resistor R3 in series;
the capacitor C5, the resistor R6 and the resistor R7 are sequentially connected in series;
the capacitor C6, the diode D5 and the diode D6 are sequentially connected in series;
the branch circuit of which the capacitor C5, the resistor R6 and the resistor R7 are sequentially connected in series is connected in parallel with the branch circuit of which the capacitor C6, the diode D5 and the diode D6 are sequentially connected in series;
the resistor R5 is connected with the capacitor C6 in parallel;
a first node is arranged between the resistor R6 and the resistor R7, a second node is arranged between the diode D5 and the diode D6, and the first node is connected with the second node through a wire.
5. The ripple reduction circuit of claim 4, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the voltage loop coupling circuit comprises a coupling resistor R8, a resistor R9, a resistor R10, a capacitor C7, a capacitor C8, an energy storage capacitor C9, a diode D7 and a diode D8;
the coupling resistor R8 is connected with the coupling capacitor C4 in series;
the resistor R9 and the capacitor C7 are connected in series;
the capacitor C8 and the resistor R10 are connected in series;
the branch circuit of the resistor R9 and the capacitor C7 which are connected in series is connected in parallel with the branch circuit of the capacitor C8 and the resistor R10 which are connected in series;
the diode D7 and the diode D8 are connected in series, and a branch of the series connection of the diode D7 and the diode D8 is connected in parallel with the resistor R10;
the energy storage capacitor C9 is connected in parallel with a branch of the capacitor C8 and the resistor R10 which are connected in series.
6. The ripple reduction circuit of claim 5 based on input feed forward and loop control,
the voltage loop controller converts the differential voltage into a differential current source, and the differential current source is connected with the energy storage capacitor C9;
the difference current source is converted into the first coupling voltage after being processed by the voltage loop coupling circuit, so that the first coupling voltage can charge the energy storage capacitor C9, and the energy storage capacitor C9 can output the reference current.
7. The ripple reduction circuit of claim 1, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the dynamic voltage signal is input to the pulse width modulation signal generator, which comprises: the MOS transistor driving circuit comprises a comparator T1, an MOS transistor driving circuit and a pulse width modulation signal generating circuit;
the pulse width modulation signal generation circuit is used for outputting triangular waves;
the comparator T1 is used for comparing the dynamic voltage signal with the amplitude of the triangular wave, and when the amplitude of the dynamic voltage signal is larger than the amplitude of the triangular wave, a high level is output; outputting a low level when the amplitude of the dynamic voltage signal is smaller than the amplitude of the triangular wave;
the output end of the MOS tube driving circuit is respectively connected with the MOS tube Q1 and the MOS tube Q2 in the booster circuit, and when the output level is high, the MOS tube Q2 is in a working state; when the output is low, the MOS transistor Q1 is in a working state.
8. The ripple reduction circuit of claim 7, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the comparator T1 comprises a positive electrode input end and a negative electrode input end;
the dynamic voltage signal is input by the positive electrode input end, and the triangular wave is input by the negative electrode input end.
9. The ripple reduction circuit of claim 2, wherein the input feed forward and loop control based circuit is configured to control the input feed forward and loop control based circuit,
the boost circuit comprises an inductor L1, a diode D2, a capacitor C1, the MOS transistor Q1 and the MOS transistor Q2;
the inductor L1 is connected with the rectifier, and the inductor L1 and the diode D1 are connected in series;
the MOS tube Q2, the diode D2 and the capacitor C1 are sequentially connected with the rectifier in parallel;
the MOS tube Q1 is connected with the diode D1 in parallel;
and the capacitor C1 is connected with the rear-end electric equipment.
10. A coated power supply, comprising:
a ripple reduction circuit based on input feed forward and loop control as claimed in any one of claims 1 to 9.
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| CN101414788A (en) * | 2008-11-25 | 2009-04-22 | 天水电气传动研究所有限责任公司 | DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections |
| CN102843024A (en) * | 2011-06-20 | 2012-12-26 | 中兴通讯股份有限公司 | Method and device for controlling parallel interleaving parallel feedback circuit (PFC) |
| CN113315394A (en) * | 2021-06-15 | 2021-08-27 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and AC/DC power supply using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101414788A (en) * | 2008-11-25 | 2009-04-22 | 天水电气传动研究所有限责任公司 | DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections |
| CN102843024A (en) * | 2011-06-20 | 2012-12-26 | 中兴通讯股份有限公司 | Method and device for controlling parallel interleaving parallel feedback circuit (PFC) |
| CN113315394A (en) * | 2021-06-15 | 2021-08-27 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and AC/DC power supply using same |
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