CN112737372A - Melt-blown fabric electret power supply based on full-control rectifier bridge and half-bridge LLC resonant circuit - Google Patents

Melt-blown fabric electret power supply based on full-control rectifier bridge and half-bridge LLC resonant circuit Download PDF

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CN112737372A
CN112737372A CN202011559258.7A CN202011559258A CN112737372A CN 112737372 A CN112737372 A CN 112737372A CN 202011559258 A CN202011559258 A CN 202011559258A CN 112737372 A CN112737372 A CN 112737372A
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voltage
resonant circuit
bridge
llc resonant
rectifier bridge
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Inventor
张雷
崔瑾
郑一专
周玲玲
吴典
姚子豪
杨德健
任磊
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Nantong University
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Nantong University
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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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 relates to the technical field of a melt-blown fabric electret power supply, in particular to a melt-blown fabric electret power supply based on a fully-controlled rectifier bridge and a half-bridge LLC resonant circuit, which comprises a power grid alternating voltage VacFull-control rectifier bridge circuit and first direct-current capacitor C1A second DC capacitor C2A first voltage equalizing resistor R1A second voltage equalizing resistor R2A half-bridge LLC resonant circuit and a high-voltage package; AC voltage V of power gridacThe output end of the full-control rectifier bridge circuit is connected with the input end of the half-bridge LLC resonant circuit, and the output end of the half-bridge LLC resonant circuit is connected with the high-voltage package; the invention can reduce the long-time operation at highThe loss of the power electronic device in the power output state is reduced, the boosting transformation ratio of the high-voltage package is reduced, the design difficulty of the high-voltage package is reduced, and the reliability of a power supply is improved; the conversion efficiency of the rectification link is improved, the utilization rate of electric energy is improved, the production efficiency is improved, and the economic benefit of the melt-blown fabric electret power supply is improved.

Description

Melt-blown fabric electret power supply based on full-control rectifier bridge and half-bridge LLC resonant circuit
Technical Field
The invention relates to the technical field of a melt-blown fabric electret power supply, in particular to a melt-blown fabric electret power supply based on a fully-controlled rectifier bridge and a half-bridge LLC resonant circuit.
Background
At present, in a meltblown electret power supply, the main structure of a preceding stage rectification part in a power supply topology which is often adopted is an uncontrolled rectifier bridge, and although the uncontrolled rectifier bridge has a simple structure and is convenient to control, the uncontrolled rectifier bridge has a low effective value of output voltage and has larger harmonic pollution to a power grid.
Therefore, the invention provides a melt-blown electret power supply based on a fully-controlled rectifier bridge and a half-bridge LLC resonant circuit, realizes the control of output voltage by a bipolar PWM (pulse-width modulation) and double closed-loop (PI + PR) control method, effectively inhibits the harmonic pollution to a power grid, improves the rectified output voltage and reduces the reactive component.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a melt-blown electret power supply based on a fully-controlled rectifier bridge and a half-bridge LLC resonant circuit, which adopts bipolar PWM modulation and double closed loop (PI + PR) control, suppresses harmonic waves, reduces reactive components, improves the electric energy quality, and reduces the pollution of the melt-blown electret power supply to a power grid; the output voltage of the rectifying circuit is increased, so that the boosting transformation ratio of the high-voltage package is reduced, the design difficulty of the high-voltage package is reduced, and the reliability of a power supply is improved.
In order to achieve the purpose, the invention adopts the following technical scheme: a melt-blown electret power supply based on a full-control rectifier bridge and a half-bridge LLC resonant circuit comprises a power grid alternating voltage VacFull-control rectifier bridge circuit and first direct-current capacitor C1The first stepTwo DC capacitors C2A first voltage equalizing resistor R1A second voltage equalizing resistor R2A half-bridge LLC resonant circuit and a high-voltage package; the AC voltage V of the power gridacThe output end of the full-control rectifier bridge circuit is connected with the input end of a half-bridge LLC resonant circuit, and the output end of the half-bridge LLC resonant circuit is connected with a high-voltage package;
the first DC capacitor C1And a second DC capacitor C2A first voltage equalizing resistor R1And a second voltage equalizing resistor R2Two of the two are mutually connected in series and then are connected in parallel between the fully-controlled rectifier bridge circuit and the half-bridge LLC resonant circuit;
the high-voltage package comprises a boosting transformer and a high-voltage side rectifier bridge connected with the boosting transformer.
By adopting the technical scheme, the invention controls the fully-controlled rectifying circuit by a double closed loop (PI + PR) control method to convert the alternating voltage V of the power grid into the alternating voltage VacThe rectification is direct current, the rectification output voltage is inverted through a half-bridge LLC resonant circuit, and finally high-voltage direct-current voltage is output through voltage boosting of a high-voltage package.
Preferably, the full-control rectification circuit is composed of a first switching tube MOSFET M1A second switch tube MOSFET M2And a third switching tube MOSFET M3And a fourth switching tube MOSFET M4Forming; the first switch tube MOSFET M1And a third switching tube MOSFET M3Is connected in series with the filter inductor L and is connected with the alternating voltage V of the power gridacIs connected with one end of the connecting rod; the second switch tube MOSFET M2And a fourth MOSFET M4Ac voltage V between the midpoint and the gridacThe other end of the connecting rod is connected.
The full-control rectification circuit adopts a bipolar PWM modulation method, firstly obtains a bipolar PWM pulse with positive and negative alternation through bipolar PWM modulation, and then controls and rectifies output voltage and inductive current through a double closed loop (PI + PR);
wherein, the outer loop controls the rectified output voltage V through voltage negative feedbackabThat is, the error between the given voltage parameter and the actual value is used as the PI regulation input to realize the DC voltage VabFast, non-statics trackingGiven voltage VdcThe stability of the rectified output voltage is improved;
the output of the outer ring PI regulator is connected with the alternating current input V by controlling the inductive current through the inner ringacMultiplication of the result with the inductor current iLComparing, and using the comparison error as input of PR regulator and the output of PR regulator as MOSFET M1、M4And M2、M3Thereby effectively suppressing current harmonics.
By the mode, the current flowing through the inductor is in the same phase with the power grid voltage, the stability of the rectified output voltage is improved, reactive power components are reduced, current harmonics are effectively inhibited, pollution of a melt-blown electret power supply to a power grid is reduced, and the power quality is improved. It is essentially to direct current capacitor C by dynamically adjusting the PWM signal1、C2And charging and discharging are carried out, the output voltage is stabilized, and the sine degree and the phase of the current waveform are controlled.
Preferably, said half bridge LLC resonant circuit is formed by a fifth MOSFET M5And a sixth MOSFET M6Resonant inductor LrAnd a resonance capacitor CrForming; the first DC capacitor C1A second DC capacitor C2And a first voltage equalizing resistor R1A second voltage equalizing resistor R2Intermediate terminal and resonant inductor LrAnd a resonance capacitor CrConnected in series and connected with one end of the low-voltage side of the boosting transformer in the high-voltage pack, and the fifth MOSFET M5And a sixth MOSFET M6The middle end of the step-up transformer is connected with the other end of the low-voltage side of the step-up transformer in the high-voltage pack, and the high-voltage side of the step-up transformer is connected with the high-voltage side rectifier bridge.
In the half-bridge LLC resonant circuit, a DC capacitor C is used1、C2Filtering and stabilizing the output DC voltage V of the full-control rectifier bridgeabPassing through a voltage equalizing resistor R1、R2The output voltage of the fully-controlled rectifying circuit is equally divided into VabHalf of that. Wherein, the switching tube MOSFET M forming a half-bridge structure5、M6The driving signals of (a) are complementary, and the duty ratios are all fixed values of 0.5.
By changing the switchTube MOSFET M5、M6The switching frequency of (2) changes the voltage on the primary side of the transformer in the high-voltage pack. The voltage at the primary side of the transformer can be determined according to Lr、CrResonant network impedance equation:
Figure BDA0002859819150000041
and (6) performing calculation.
From the formula, L is known when the switching frequency f is changedr、CrImpedance change of the resonant network, Lr、CrThe resonance network divides the output voltage of the half-bridge inversion to change, and finally the input voltage of the high-voltage package is changed. Here by means of a series resonant capacitor CrThe blocking effect of (3) can suppress the saturation phenomenon of the step-up transformer. According to the technical scheme, the invention can ensure the safety and reliability of the circuit, ensure the circuit to have good running state, and simultaneously improve the direct current voltage, reduce the device current, reduce the conduction loss and improve the transmission efficiency.
Preferably, the implementation method of the meltblown electret power supply based on the fully-controlled rectifier bridge and the half-bridge LLC resonant circuit is as follows:
during operation, the AC voltage V of the networkacThe energy is rectified into direct current voltage by a fully-controlled rectifier bridge circuit and then passes through a first direct current capacitor C1A second DC capacitor C2A first voltage equalizing resistor R1A second voltage equalizing resistor R2The half-bridge LLC resonant circuit inverts the rectified output voltage and finally outputs high-voltage direct-current voltage through voltage boosting of the high-voltage package;
in the rectification process of the fully-controlled rectifier bridge circuit: first switch tube MOSFET M1And a fourth switching tube MOSFET M4And a second switching tube MOSFET M2And a third switching tube MOSFET M3The two groups of devices are in a complementary state and are alternately conducted, and the direct current voltage output by rectification is changed through PWM modulation, so that the conversion of alternating current is realized;
in a half-bridge LLC resonant circuit: firstly passes through a first direct current capacitor C1And a second DC capacitor C2Filtering, and passing through a first voltage equalizing resistor R1And a second voltage equalizing resistor R2Will control the rectifier bridge output voltage V entirelyabThe average value is half, inversion is carried out through a half-bridge LLC resonant circuit, and finally the input direct current voltage is converted into alternating current voltage to be output. Here by changing the switching tube MOSFET M5、MOSFET M6To change Lr、CrThe voltage of the low-voltage side of the transformer is changed, stable voltage with stronger anti-interference performance is obtained, and stable direct-current high voltage is obtained through the high-voltage package.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the melt-blown fabric electret power supply based on the full-control rectifier bridge and the half-bridge LLC resonant circuit, the full-control rectifier bridge adopts bipolar PWM modulation and double closed loop (PI + PR) control, and the output voltage amplitude of the rectifier circuit is increased, so that the boost transformation ratio of the booster transformer is reduced, the design and manufacturing difficulty of a high-voltage bag is reduced, harmonic waves are suppressed, reactive components are reduced, the electric energy quality is improved, and the pollution of the melt-blown fabric electret power supply to a power grid is reduced.
(2) The fully-controlled rectifier bridge and the half-bridge LLC resonant circuit are adopted, so that the safety and the reliability of the circuit are improved, the circuit is in a good running state, the loss of power electronic devices in a high output power state after long-time running is reduced, the boosting transformation ratio of a high-voltage package is reduced, the design difficulty of the high-voltage package is reduced, and the reliability of the power supply is improved.
Drawings
Fig. 1 is a circuit topology diagram of the present invention.
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 the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present invention provides a technical solution: a melt-blown electret power supply based on a full-control rectifier bridge and a half-bridge LLC resonant circuit comprises a power grid alternating voltage VacFull-control rectifier bridge circuit and first direct-current capacitor C1A second DC capacitor C2A first voltage equalizing resistor R1A second voltage equalizing resistor R2A half-bridge LLC resonant circuit and a high-voltage package; the AC voltage V of the power gridacThe output end of the full-control rectifier bridge circuit is connected with the input end of a half-bridge LLC resonant circuit, and the output end of the half-bridge LLC resonant circuit is connected with a high-voltage package;
the first DC capacitor C1And a second DC capacitor C2A first voltage equalizing resistor R1And the second isVoltage resistance R2Two of the two are mutually connected in series and then are connected in parallel between the fully-controlled rectifier bridge circuit and the half-bridge LLC resonant circuit;
the high-voltage package comprises a boosting transformer and a high-voltage side rectifier bridge connected with the boosting transformer.
By adopting the technical scheme, the full-control rectification circuit is controlled by a double closed loop (PI + PR) control method, and the alternating voltage V of the power grid is converted into the alternating voltage VacThe rectification is direct current, the rectification output voltage is inverted through a half-bridge LLC resonant circuit, and finally high-voltage direct-current voltage is output through voltage boosting of a high-voltage package.
Specifically, the full-control rectification circuit comprises a first switching tube MOSFET M1A second switch tube MOSFET M2And a third switching tube MOSFET M3And a fourth switching tube MOSFET M4Forming; the first switch tube MOSFET M1And a third switching tube MOSFET M3Is connected in series with the filter inductor L and is connected with the alternating voltage V of the power gridacIs connected with one end of the connecting rod; the second switch tube MOSFET M2And a fourth MOSFET M4Ac voltage V between the midpoint and the gridacThe other end of the connecting rod is connected.
The full-control rectification circuit adopts a bipolar PWM modulation method, firstly obtains a bipolar PWM pulse with positive and negative alternation through bipolar PWM modulation, and then controls and rectifies output voltage and inductive current through a double closed loop (PI + PR);
wherein, the outer loop controls the rectified output voltage V through voltage negative feedbackabThat is, the error between the given voltage parameter and the actual value is used as the PI regulation input to realize the DC voltage VabFast, non-static tracking of a given voltage VdcThe stability of the rectified output voltage is improved;
the output of the outer ring PI regulator is connected with the alternating current input V by controlling the inductive current through the inner ringacMultiplication of the result with the inductor current iLComparing, and using the comparison error as input of PR regulator and the output of PR regulator as MOSFET M1、M4And M2、M3Thereby effectively suppressing current harmonics.
In the way described aboveThe current flowing through the inductor is in the same phase with the power grid voltage, the stability of the rectified output voltage is improved, the reactive component is reduced, the current harmonic is effectively inhibited, the pollution of a melt-blown electret power supply to the power grid is reduced, and the power quality is improved. It is essentially to direct current capacitor C by dynamically adjusting the PWM signal1、C2And charging and discharging are carried out, the output voltage is stabilized, and the sine degree and the phase of the current waveform are controlled.
Specifically, the half-bridge LLC resonant circuit is composed of a fifth MOSFET M5And a sixth MOSFET M6Resonant inductor LrAnd a resonance capacitor CrForming; the first DC capacitor C1A second DC capacitor C2And a first voltage equalizing resistor R1A second voltage equalizing resistor R2Intermediate terminal and resonant inductor LrAnd a resonance capacitor CrConnected in series and connected with one end of the low-voltage side of the boosting transformer in the high-voltage pack, and the fifth MOSFET M5And a sixth MOSFET M6The middle end of the step-up transformer is connected with the other end of the low-voltage side of the step-up transformer in the high-voltage pack, and the high-voltage side of the step-up transformer is connected with the high-voltage side rectifier bridge.
In the half-bridge LLC resonant circuit, a DC capacitor C is used1、C2Filtering and stabilizing the output DC voltage V of the full-control rectifier bridgeabPassing through a voltage equalizing resistor R1、R2The output voltage of the fully-controlled rectifying circuit is equally divided into VabHalf of that. Wherein, the switching tube MOSFET M forming a half-bridge structure5、M6The driving signals of (a) are complementary, and the duty ratios are all fixed values of 0.5.
By changing the switching tube MOSFET M5、M6The switching frequency of (2) changes the voltage on the primary side of the transformer in the high-voltage pack. The voltage at the primary side of the transformer can be determined according to Lr、CrResonant network impedance equation:
Figure BDA0002859819150000091
and (6) performing calculation.
According to the formula, when the switch is changedAt frequency f, Lr、CrImpedance change of the resonant network, Lr、CrThe resonance network divides the output voltage of the half-bridge inversion to change, and finally the input voltage of the high-voltage package is changed. Here by means of a series resonant capacitor CrThe blocking effect of (3) can suppress the saturation phenomenon of the step-up transformer. According to the technical scheme, the invention can ensure the safety and reliability of the circuit, ensure the circuit to have good running state, and simultaneously improve the direct current voltage, reduce the device current, reduce the conduction loss and improve the transmission efficiency.
Specifically, the implementation method of the meltblown electret power supply based on the fully-controlled rectifier bridge and the half-bridge LLC resonant circuit is as follows:
during operation, the AC voltage V of the networkacThe energy is rectified into direct current voltage by a fully-controlled rectifier bridge circuit and then passes through a first direct current capacitor C1A second DC capacitor C2A first voltage equalizing resistor R1A second voltage equalizing resistor R2The half-bridge LLC resonant circuit inverts the rectified output voltage and finally outputs high-voltage direct-current voltage through voltage boosting of the high-voltage package;
in the rectification process of the fully-controlled rectifier bridge circuit: first switch tube MOSFET M1And a fourth switch tube MOSFET M4And a second switching tube MOSFET M2And a third switching tube MOSFET M3The two groups of devices are in a complementary state and are alternately conducted, and the direct current voltage output by rectification is changed through PWM modulation, so that the conversion of alternating current is realized;
in a half-bridge LLC resonant circuit: firstly passes through a first direct current capacitor C1And a second DC capacitor C2Filtering, and passing through a first voltage equalizing resistor R1And a second voltage equalizing resistor R2Will control the rectifier bridge output voltage V entirelyabThe average value is half, inversion is carried out through a half-bridge LLC resonant circuit, and finally the input direct current voltage is converted into alternating current voltage to be output. Here by changing the switching tube MOSFET M5、MOSFET M6To change Lr、CrSo that the voltage on the low-voltage side of the transformer is changed, and a stable voltage with stronger anti-interference performance is obtained,and stable direct current high voltage is obtained through the high voltage package.
Meanwhile, in order to effectively drive the MOSFET, the invention needs to change the switching frequency so as to realize a wide voltage range. Therefore, the full-control rectifier bridge circuit firstly obtains the bipolar PWM pulse with alternating positive and negative through bipolar PWM modulation, and then controls the rectified output voltage and the inductive current through a double closed loop (PI + PR), so that the stability of the rectified output voltage is improved, the reactive component is reduced, and the current harmonic wave is effectively inhibited. Then the half-bridge LLC resonant circuit changes voltage through a PFM modulation method and outputs alternating voltage; and finally obtaining high-voltage direct current output through a high-voltage pack.
In addition, the output voltage amplitude of the meltblown electret power supply of the invention depends on four factors: the output voltage of the full-control rectifier bridge, the output voltage of the half-bridge LLC resonant circuit, the step-up ratio of the transformer and the high-voltage side rectifier bridge. Wherein the output voltage of the fully-controlled rectifier bridge depends on the network voltage VacAnd a voltage given value in the double closed-loop control; the output voltage of a half-bridge LLC resonant circuit depends on its input voltage and switching frequency; the boosting ratio of the boosting transformer depends on the primary and secondary coil ratios of the transformer, is a constant and is unchangeable; the output voltage of the high-voltage side rectifier bridge depends on the voltage of the high-voltage side of the booster transformer, and the rectifier circuit does not have the capacity of changing the voltage amplitude. To conclude, the following steps are carried out: the output voltage of the meltblown electret power supply can be changed by changing the voltage setting in the fully-controlled rectifier bridge double closed-loop control and the switching frequency in the half-bridge LLC resonant circuit.
In summary, the meltblown electret power supply based on the fully-controlled rectifier bridge and the half-bridge LLC resonant circuit provided by the invention uses the MOSFET tube, and controls the output voltage by a double closed loop (PI + PR) control method. The defects that an uncontrolled rectifier bridge and a diode cannot control output voltage adopted in a traditional melt-blown fabric electret power supply are overcome, so that the step-up transformation ratio of a high-voltage bag is reduced, the design and manufacturing difficulty of the high-voltage bag is reduced, and the melt-blown fabric electret power supply is more reliable. Since the output voltage of the half-bridge LLC resonant circuit is determined by the input voltage and the switching frequency, the amplitude of the output voltage of the meltblown electret power supply can be changed by changing the voltage setting in the double closed loop (PI + PR) of the fully-controlled rectifying circuit and the switching frequency of the half-bridge LLC resonant circuit.
Compared with the traditional melt-blown fabric electret power supply, the invention increases the output voltage amplitude of the rectifying circuit, thereby reducing the boosting transformation ratio of the boosting transformer, reducing the design and manufacture difficulty of a high-voltage pack, reducing the current of a device and reducing the loss; harmonic current is suppressed, reactive component is reduced, electric energy quality is improved, and pollution of a melt-blown fabric electret power supply to a power grid is reduced; the contravariant part compares in full-bridge LLC resonant circuit, and half-bridge LLC resonant circuit has switching device less, advantage that the cost is lower.
The invention is not described in detail, but is known to those skilled in the art.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (4)

1. A melt-blown electret power supply based on a fully-controlled rectifier bridge and a half-bridge LLC resonant circuit is characterized by comprising a power grid alternating voltage (V)ac) A full-controlled rectifier bridge circuit, a first DC capacitor (C)1) A second DC capacitor (C)2) A first voltage equalizing resistor (R)1) A second voltage equalizing resistor (R)2) A half-bridge LLC resonant circuit and a high-voltage package; said network AC voltage (V)ac) The output end of the full-control rectifier bridge circuit is connected with the input end of a half-bridge LLC resonant circuit, and the output end of the half-bridge LLC resonant circuit is connected with a high-voltage package;
the first mentionedA DC capacitor (C)1) And a second DC capacitor (C)2) A first voltage equalizing resistor (R)1) And a second voltage equalizing resistor (R)2) Two of the two are mutually connected in series and then are connected in parallel between the fully-controlled rectifier bridge circuit and the half-bridge LLC resonant circuit;
the high-voltage package comprises a boosting transformer and a high-voltage side rectifier bridge connected with the boosting transformer.
2. The fused-blown electret power supply based on the full-controlled rectifier bridge and the half-bridge LLC resonant circuit as claimed in claim 1, wherein the full-controlled rectifier circuit is composed of a first switching tube MOSFET (M)1) A second switch tube MOSFET (M)2) And a third switch tube MOSFET (M)3) And a fourth switching tube MOSFET (M)4) Forming; the first switch tube MOSFET (M)1) And a third switching tube MOSFET (M)3) Is connected in series with a filter inductance (L) and is connected with the alternating voltage (V) of the power gridac) Is connected with one end of the connecting rod; the second switch tube MOSFET (M)2) And a fourth MOSFET (M)4) Of the neutral point of (c) and the grid ac voltage (V)ac) The other end of the connecting rod is connected.
3. The meltblown electret power supply based on fully controlled rectifier bridge and half-bridge LLC resonant circuit as claimed in claim 2, wherein said half-bridge LLC resonant circuit is composed of fifth MOSFET (M5) And a sixth MOSFET (M)6) Resonant inductor (L)r) And a resonance capacitor (C)r) Forming; said first DC capacitor (C)1) A second DC capacitor (C)2) And a first voltage equalizing resistor (R)1) A second voltage equalizing resistor (R)2) Intermediate terminal and resonant inductor (L)r) And a resonance capacitor (C)r) Connected in series and connected to one end of the low voltage side of the step-up transformer in the high voltage pack, the fifth MOSFET (M)5) And a sixth MOSFET (M)6) The middle end of the step-up transformer is connected with the other end of the low-voltage side of the step-up transformer in the high-voltage pack, and the high-voltage side of the step-up transformer is connected with the high-voltage side rectifier bridge.
4. The meltblown electret power supply based on the fully-controlled rectifier bridge and the half-bridge LLC resonant circuit as claimed in claim 3, wherein said meltblown electret power supply based on the fully-controlled rectifier bridge and the half-bridge LLC resonant circuit is implemented by:
during operation, the network AC voltage (V)ac) The energy is rectified into direct current voltage by a fully-controlled rectifier bridge circuit and then passes through a first direct current capacitor (C)1) A second DC capacitor (C)2) A first voltage equalizing resistor (R)1) A second voltage equalizing resistor (R)2) The half-bridge LLC resonant circuit inverts the rectified output voltage and finally outputs high-voltage direct-current voltage through voltage boosting of the high-voltage package;
in the rectification process of the fully-controlled rectifier bridge circuit: first switch tube MOSFET (M)1) And a fourth switching tube MOSFET (M)4) And a second switching tube MOSFET (M)2) And a third switch tube MOSFET (M)3) The two groups of devices are in a complementary state and are alternately conducted, and the direct current voltage output by rectification is changed through PWM modulation, so that the conversion of alternating current is realized;
in a half-bridge LLC resonant circuit: through a first DC capacitor (C)1) And a second DC capacitor (C)2) Filtering, and passing through a first voltage equalizing resistor (R)1) And a second voltage equalizing resistor (R)2) Will control the output voltage (V) of the rectifier bridge entirelyab) The average value is half, inversion is carried out through a half-bridge LLC resonant circuit, and finally the input direct current voltage is converted into alternating current voltage to be output.
CN202011559258.7A 2020-12-25 2020-12-25 Melt-blown fabric electret power supply based on full-control rectifier bridge and half-bridge LLC resonant circuit Pending CN112737372A (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
CN106655793A (en) * 2017-02-07 2017-05-10 南京航空航天大学 Common resonant inductor type wide-input-range LLC resonant converter
US20170366099A1 (en) * 2015-03-18 2017-12-21 Shenzhen Boyn Electric Co., Ltd. High-frequency isolation alternating/direct current conversion circuit and control method thereof
CN107612337A (en) * 2017-08-10 2018-01-19 上海交通大学 A kind of LLC resonant converter and its modulator approach for suppressing circulating energy
CN210669601U (en) * 2019-08-02 2020-06-02 矽力杰半导体技术(杭州)有限公司 Battery charging circuit
CN112054699A (en) * 2020-09-16 2020-12-08 南通大学 Integrated PCB (printed circuit board) level meltblown electret power supply topology

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170366099A1 (en) * 2015-03-18 2017-12-21 Shenzhen Boyn Electric Co., Ltd. High-frequency isolation alternating/direct current conversion circuit and control method thereof
CN106655793A (en) * 2017-02-07 2017-05-10 南京航空航天大学 Common resonant inductor type wide-input-range LLC resonant converter
CN107612337A (en) * 2017-08-10 2018-01-19 上海交通大学 A kind of LLC resonant converter and its modulator approach for suppressing circulating energy
CN210669601U (en) * 2019-08-02 2020-06-02 矽力杰半导体技术(杭州)有限公司 Battery charging circuit
CN112054699A (en) * 2020-09-16 2020-12-08 南通大学 Integrated PCB (printed circuit board) level meltblown electret power supply topology

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Application publication date: 20210430