CN116526857B - Forward and reverse excitation converter and control method - Google Patents

Forward and reverse excitation converter and control method Download PDF

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Publication number
CN116526857B
CN116526857B CN202310516050.4A CN202310516050A CN116526857B CN 116526857 B CN116526857 B CN 116526857B CN 202310516050 A CN202310516050 A CN 202310516050A CN 116526857 B CN116526857 B CN 116526857B
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loop
input
output
switching tube
capacitor
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CN116526857A (en
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严宗周
秦志强
位亚东
张波
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Shenzhen Ouai Semiconductor Co ltd
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Shenzhen Ouai Semiconductor Co ltd
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Classifications

    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
    • 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 provides a forward and backward excitation converter and a control method, which relate to the technical field of converters and comprise the following steps: the input unit, the first switching tube, the potential energy converter, output rectifying tube, inductance LP and output unit, the potential energy converter is inductance or transformer, if the potential energy converter is transformer, should include primary winding and secondary winding at least; when the input type of the input unit is alternating current input, the output rectifying tube comprises a positive half-cycle output rectifying tube and a negative half-cycle output rectifying tube; the input unit is respectively connected with the first switching tube and the potential energy converter to form a first loop; the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop; when the input type of the input unit is alternating current input, the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop, and the problem that the structure of the conventional forward and reverse excitation converter is complex and the cost is high is solved.

Description

Forward and reverse excitation converter and control method
Technical Field
The invention relates to the technical field of converters, in particular to a forward and reverse excitation converter and a control method.
Background
In the existing medium-large power supply, the normal architecture needs to rectify and then output in multiple paths or single path, and two paths of positive and negative half cycles are needed during bridge rectification, and each path has two pipe strings, so that the power consumed by rectification is larger; such as a 100W power supply, only a rectifier bridge requires about 1.8W of power at the time of low voltage input.
In order to effectively utilize the power grid, many products require high power factors, such as an LED lamp power supply and a power supply above 75W, and in order to achieve high PF, two-pole conversion is generally required, namely, boosting to increase the PF value and then performing buck or boost conversion, and two inductors or one inductor plus one transformer are required for two-time conversion, so that not only is part of energy wasted but also the total volume of the converter is increased.
An effective solution to the above-mentioned problems has not been proposed yet.
Disclosure of Invention
Accordingly, the present invention is directed to a flyback converter and a control method thereof, so as to solve the problems of complex structure and high cost of the existing flyback converter.
In a first aspect, an embodiment of the present invention provides a flyback converter, including: the input unit, the first switching tube, the potential energy converter, output rectifying tube, inductance and output unit, wherein, the said potential energy converter is inductance or transformer, should include primary winding and secondary winding at least if the said potential energy converter is the transformer, when the input type of the said input unit is AC input, the said output rectifying tube includes positive half cycle output rectifying tube and negative half cycle output rectifying tube; the input unit is respectively connected with the first switch tube and the potential energy converter to form a first loop; the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop; and when the input type of the input unit is alternating current input, the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop.
Further, the flyback converter further includes: the peak value absorption capacitor is respectively connected with the input unit and the second switching tube, the second switching tube is respectively connected with the first switching tube and the peak value absorption capacitor, and the first capacitor is respectively connected with the inductor and the secondary winding; the peak absorption capacitance, the second switching tube and the primary winding form a fourth loop.
Further, the output unit includes at least one output, where the at least one output includes: the second capacitor is connected in series with the first reverse diode, or the second capacitor, the first reverse diode and a switching tube are connected in series sequentially, or the second capacitor is connected in series with the two switching tubes with opposite directions, or the second capacitor is connected in series with a switching tube which is not conducted in two directions, or a resistor, or a switching tube, or an LED lamp.
Further, if the at least one output includes a second capacitor connected in series with a first reverse diode, the flyback converter further includes: the fourth switching tube is respectively connected with the input end of the inductor, the output end of the first reverse diode and the input end of the second capacitor; the second capacitor, the fourth switching tube, the inductor and the output unit form a fifth loop; the second capacitor, the output rectifier, the inductor and the secondary winding form a sixth loop.
Further, the flyback converter further includes: a fifth switching tube, wherein the fifth switching tube is respectively connected with the output end of the inductor and the secondary winding; the secondary winding, the output rectifying tube, the inductor and the fifth switching tube form a seventh loop; the second capacitor, the fourth switching tube, the inductor and the fifth switching tube form an eighth loop.
Further, the flyback converter further includes: the input capacitor is connected with the input unit in parallel, the sixth switching tube is used for replacing the positive half-cycle output rectifying tube, the seventh switching tube is used for replacing the negative half-cycle output rectifying tube, the eighth switching tube is used for replacing the first reverse diode, and the second diode is respectively connected with the seventh switching tube and the secondary winding.
Further, the type of the input unit includes at least one of: ac input, dc input, fluctuating voltage input, input capacitance and battery.
Further, when the input unit is of a direct current input type, the negative half-cycle output rectifying tube is connected with the output unit.
Further, when the input unit is of the ac input type, the input unit is connected to the primary winding, and the transformer is equivalent to an isolated rectifier bridge.
In a second aspect, an embodiment of the present invention further provides a method for controlling a flyback converter, including: when the input unit is in high voltage, after the first loop is conducted, the loops with the same phase as the first loop in the second loop and the third loop are opened, so that the input unit supplies power for the output unit; simultaneously storing differential energy between the converter secondary winding and the output cell voltage to an inductance; or when the first loop is conducted, the seventh loop is conducted, and input energy is stored in the inductor; after the first loop is closed, the output unit is powered through the inductor, and the magnetic reset of the transformer is realized while the inductor is demagnetized; when the input of the input unit is low voltage, the output unit is powered by any one of the following modes: the secondary winding and the inductor are overlapped and boosted to supply power for the output unit; shorting the output unit to enable energy to be stored in the inductor and then boosting to supply power for the output unit; and storing the energy of the input unit into the potential energy conversion unit so that the potential energy conversion unit supplies power to the output unit through flyback boost.
Further, if the flyback converter includes a fourth loop, the leakage inductance recycling and ZVS zero-voltage switching control method of the flyback converter includes: after the first loop is closed, the fourth loop is conducted, leakage inductance energy of a primary winding of the potential energy conversion unit is reversely boosted to charge a peak absorption capacitor, and the potential energy conversion unit supplies power to the output unit through mutual inductance; after the leakage inductance energy of the primary winding is released, the fourth loop is conducted so that the peak absorption capacitor supplies power for the output unit; after the energy of the peak absorption capacitor is smaller than a preset value, closing the fifth loop to enable the VDS drain-source voltage of the first switching tube to be 0; and the first loop is conducted, and after the leakage inductance energy of the primary winding is released, the input unit supplies forward and reverse excitation power to the output unit again.
Further, if the flyback converter includes a fifth loop, a sixth loop and an eighth loop, the control method for peak clipping, energy storage and valley filling of the flyback converter includes: when the input unit inputs a sine wave peak, a sixth loop is conducted so that the redundant energy of the sine wave peak is stored in a second capacitor; and when the input of the input unit is sine wave valley, a fifth loop or an eighth loop is conducted, and the second capacitor supplies power to the output unit.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, where the memory is configured to store a program for supporting the processor to execute the method described in the first aspect, and the processor is configured to execute the program stored in the memory.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon.
In the embodiment of the invention, a forward and reverse excitation converter is provided, which comprises an input unit, a first switching tube, a potential energy converter, an output rectifying tube, an inductor LP and an output unit, wherein the potential energy converter is an inductor or a transformer, and if the potential energy converter is a transformer, the potential energy converter at least comprises a primary winding and a secondary winding; when the input type of the input unit is alternating current input, the output rectifying tube comprises a positive half-cycle output rectifying tube and a negative half-cycle output rectifying tube; the input unit is respectively connected with the first switch tube and the potential energy converter to form a first loop; the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop; when the input type of the input unit is alternating current input, the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop, so that the purpose of omitting a rectifying bridge in the conventional forward-flyback converter is achieved, the problems of complex structure and high cost of the conventional forward-flyback converter are solved, and the technical effects of simplifying the structure of the forward-flyback converter and reducing the cost of the forward-flyback converter are achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the invention or the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being apparent that the drawings in the description below are some of the embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a flyback converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of leakage inductance recovery of a flyback converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a flyback converter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a flyback converter valley-fill output according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of flyback boost of a flyback converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a seventh loop input inductor energy storage provided in an embodiment of the present invention;
fig. 7 is a schematic diagram of a second capacitor in an eighth loop according to an embodiment of the present invention for storing energy by inductance;
FIG. 8 is a schematic diagram of a secondary buck-boost voltage of a flyback converter according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a dc input flyback converter according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an AC input flyback converter according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of an operation mode of a flyback converter according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a flyback converter according to an embodiment of the present invention for supplying power to an output unit;
FIG. 13 is a schematic diagram of a positive half-cycle mode of leakage inductance recovery of a flyback converter according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a peak clipping and valley filling mode of a high PF of a flyback converter according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
according to an embodiment of the present invention, there is provided a flyback converter, including: the input unit, the first switching tube, the potential energy converter, output rectifying tube, inductance LP and output unit, wherein, the said potential energy converter is inductance or transformer, should include primary winding and secondary winding at least if the said potential energy converter is the transformer; when the input type of the input unit is alternating current input, the output rectifying tube comprises a positive half-cycle output rectifying tube and a negative half-cycle output rectifying tube;
the input unit is respectively connected with the first switch tube and the potential energy converter to form a first loop;
the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop;
and when the input type of the input unit is alternating current input, the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop.
As shown in fig. 1, the first switching tube K1 is connected to the primary winding of the potential energy converter T1 and the input unit, the positive half-cycle output rectifying tube D1 is connected to the secondary winding of the potential energy converter T1 and the inductor LP, the negative half-cycle output rectifying tube D1 is connected to the secondary winding of the potential energy converter T1 and the inductor LP, and the output unit is connected to the inductor LP and the potential energy converter T1.
In an embodiment of the invention, a forward and flyback converter is provided, which comprises an input unit, a first switching tube, a potential energy converter, an output rectifying tube, an inductor LP and an output unit. The potential energy converter is an inductor or a transformer, and if the potential energy converter is a transformer, the potential energy converter at least comprises a primary winding and a secondary winding; the output rectifying tube comprises a positive half-cycle output rectifying tube and a negative half-cycle output rectifying tube; the input unit is respectively connected with the first switch tube and the potential energy converter to form a first loop; the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop; the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop, so that the purpose of omitting a rectifying bridge in the conventional forward-flyback converter is achieved, the problems of complex structure and high cost of the conventional forward-flyback converter are solved, and the technical effects of simplifying the structure of the forward-flyback converter and reducing the cost of the forward-flyback converter are achieved.
It should be noted that, the types of the input units include at least one of the following: ac input, dc input, fluctuating voltage input, input capacitance and battery.
In an embodiment of the present invention, as shown in fig. 2, the flyback converter further includes: the peak absorption capacitor C1, the second switching tube KF and the first capacitor EP, wherein the peak absorption capacitor is respectively connected with the input unit IN and the second switching tube KF, the second switching tube KF is respectively connected with the first switching tube K1 and the peak absorption capacitor, and the first capacitor EP is respectively connected with the inductor LP and the secondary winding;
the peak absorption capacitance, the second switching tube and the primary winding form a fourth loop.
In an embodiment of the present invention, as shown in fig. 3, the output unit includes at least one output, where the at least one output includes: the second capacitor EP is connected in series with the first reverse diode DP, or the third capacitor VOUT2 or VOUT3 is connected in series with the third switching tube KOUT2 or KOUT3.
In the embodiment of the invention, a plurality of output capacitors are added on the second loop and the third loop, and a diode or a switching tube is connected in series on the output capacitors to form a multi-output converter.
In an embodiment of the present invention, as shown in fig. 4 and fig. 5, if the at least one output includes a second capacitor connected in series with a first reverse diode, the flyback converter further includes: a fourth switching tube KP1, wherein the fourth switching tube is respectively connected with the input end of the inductor, the output end of the first reverse diode and the input end of the second capacitor;
the second capacitor, the fourth switching tube, the inductor and the output unit form a fifth loop;
the second capacitor, the output rectifier, the inductor and the secondary winding form a sixth loop.
In the embodiment of the present invention, if at least one output includes a second capacitor EP connected in series with a first reverse diode DP, a fourth switching tube KP1 is added to the second capacitor EP, the fourth switching tube KP1 is electrically connected to the positive half-cycle rectifying tube and the inductor input end, and the second capacitor EP, the fourth switching tube KP1 and the output unit are electrically connected to form a fifth loop (i.e., a valley-filled output loop). The second capacitor EP, the fourth switching tube KP1, the output rectifying tubes D1 and D2, and the secondary winding of the potential energy conversion unit T1 are electrically connected to form a sixth loop (i.e., flyback boost loop).
In an embodiment of the present invention, as shown in fig. 6 and fig. 7, the flyback converter further includes: a fifth switching tube KB, wherein the fifth switching tube is respectively connected with the output end of the inductor and the secondary winding;
the secondary winding, the output rectifying tube, the inductor and the fifth switching tube form a seventh loop;
the second capacitor, the fourth switching tube, the inductor and the fifth switching tube form an eighth loop.
In the embodiment of the invention, the boost output is realized by adding the fifth switching tube KB. The secondary winding, the output rectifying tubes D1 and D2, the inductor LP and the fifth switching tube KB form a seventh loop; the output capacitor EP, the fourth switching tube KP1, the inductance LP and the fifth switching tube KB form an eighth loop. The seventh loop and the eighth loop may also be referred to as tank boost loops.
In an embodiment of the present invention, as shown in fig. 8, the flyback converter further includes: the input capacitor EC1, the second diode DD, the sixth switching tube KD1, the seventh switching tube KD2 and the eighth switching tube KP, wherein, input capacitor EC1 with input unit parallel connection, sixth switching tube KD1 is used for substituting positive half cycle output rectifier tube D1, seventh switching tube KD2 is used for substituting negative half cycle output rectifier tube D2, eighth switching tube KP is used for substituting first reverse diode DP, second diode DD is connected with seventh switching tube KD2 and secondary winding respectively.
It should be noted that, in the embodiment of the present invention, each loop in the flyback converter may be arbitrarily combined according to actual requirements, and the position of the element on each loop may be adjusted.
By using the sixth switching tube KD1 to replace the positive half-cycle output rectifying tube D1, using the seventh switching tube KD2 to replace the negative half-cycle output rectifying tube D2 and using the eighth switching tube KP to replace the first reverse diode DP, the efficiency of the forward and reverse excitation converter can be effectively improved.
Further, components are added to each loop as needed, for example, a second diode DD, EMC components, a multiplexing module, etc., and the addition of the second diode DD can be used for boosting the flywheel.
As shown in fig. 9, when the input type of the input unit is dc input, the negative half-cycle output rectifier is connected to the output unit.
As shown in fig. 10, when the input type of the input unit is dc input, the first loop is turned on, the forward energy is transmitted to the output unit and the inductor LP through the positive half-cycle output rectifier D1, then the first loop is turned off, and the exciting energy and the leakage inductance energy flyback boost in the transformer directly supply power to the output unit while the inductor LP freewheels.
When the input unit is of an alternating current input type, the input unit is connected with the primary winding, and the transformer is equivalent to an isolated rectifier bridge.
When the input unit is of an alternating current input type, the first loop needs to be conducted for a long time, the inductance of the potential energy converter is large, the inductance is large, energy goes to the secondary, the secondary is conducted by a diode in the forward direction and the reverse direction, and the converter is equivalent to an isolated rectifier bridge.
The operation of the forward/reverse converter will be described below.
As shown in fig. 11, after the first loop is conducted, the loop with the same phase as the first loop in the second loop and the third loop is opened, and the input unit directly supplies power to the output unit; simultaneously storing differential energy between the converter secondary winding and the output cell voltage to a LP inductor; or when the first loop is conducted, the seventh loop is conducted, and the input energy is stored in the LP inductor.
After the first loop is closed, the power is supplied to the output unit through the inductor, and the magnetic reset of the transformer is realized while the inductor demagnetizes.
When the input of the input unit is low voltage, the output unit is powered by any one of the following ways:
and 1, boosting the voltage by overlapping the secondary winding and the inductor to supply power to the output unit.
And 2, shorting the output unit so that the energy is stored in the inductor and then boosted to supply power for the output unit.
And 3, storing the energy of the input unit into the potential energy conversion unit so that the potential energy conversion unit supplies power to the output unit through flyback boost.
The leakage inductance recycling and ZVS zero-voltage switch control method of the forward and reverse excitation converter will be described.
As shown in fig. 12, if the flyback converter includes the fourth loop, after the first loop is closed, the fourth loop is turned on, the leakage inductance energy of the primary winding of the potential energy conversion unit is reversely boosted to charge the peak absorption capacitance, and the potential energy conversion unit supplies power to the output unit through mutual inductance.
After the leakage inductance energy of the primary winding is released, the fourth loop is conducted so that the peak absorption capacitor supplies power for the output unit. And closing the fifth loop after the energy of the peak absorption capacitor is smaller than a preset value. Since the inductor current cannot be suddenly changed, the energy released by the peak absorption capacitor to the primary winding cannot be coupled to the leakage inductance energy of the secondary, so that the voltage of the primary winding is back-pressed, and the voltage of the VDS drain source electrode of the first switch tube is 0.
At this time, the first loop is conducted, and after the energy of the primary winding is released, the input supplies power to the output forward and backward excitation again, and the cycle is repeated.
The control method of peak clipping, energy storage and valley filling of the forward and backward excitation converter is described below.
As shown in fig. 13 and 14, if the flyback converter includes a fifth loop, a sixth loop, and a seventh loop, the flyback converter outputs a low ripple with a high PF as an input. When the input unit inputs a peak of a sine wave, the sixth loop is conducted so that the redundant energy of the peak of the sine wave is stored in the second capacitor EP.
When the input of the input unit is sine wave valley, the fifth loop or the eighth loop is conducted, and the second capacitor supplies power to the output unit. The forward and reverse excitation converter provided by the embodiment of the invention is provided with a rectifier bridge, the input and the converter are directly connected, and the input forward and reverse waveforms of the forward and reverse excitation converter realize the same-phase output through the secondary connection of two windings which are connected in series in a reversing way; and the input is direct forward output in a high-voltage period, and when the input is low-voltage, energy transmission is realized through series lamination or flyback boost. Multiple paths of output can be added to the secondary, one path is taken to realize high PFC, excess energy is stored in a PFC capacitor when a sine wave peak is input, and the energy is filled back to an output loop when the energy is low, so that the forward-reverse converter without bridge stacks and with high PF is input, low ripple is output, and even multiple paths of output is realized.
Embodiment two:
the embodiment of the invention also provides an embodiment of a control method of the flyback converter, and the flyback converter is used for executing the control method of the flyback converter provided by the embodiment of the invention, and the following is a specific description of the control method of the flyback converter provided by the embodiment of the invention.
The control method of the forward and reverse excitation converter comprises the following steps:
step S102, when the input unit is at high voltage, after the first loop is conducted, the loops with the same phase as the first loop in the second loop and the third loop are opened so as to enable the input unit to supply power for the output unit; simultaneously storing differential energy between the converter secondary winding and the output cell voltage to an inductance;
step S104, or when the first loop is conducted, the seventh loop is conducted, and input energy is stored in the inductor;
step S106, after the first loop is closed, the output unit is powered through the inductor, and the magnetic reset of the transformer is realized while the inductor is demagnetized;
when the input of the input unit is low voltage, the output unit is powered by any one of the following modes:
step S108, the secondary winding and the inductor are overlapped and boosted to supply power for the output unit;
step S110, short-circuiting the output unit so as to boost power for the output unit after energy is stored in the inductor;
and step S112, storing the energy of the input unit into the potential energy conversion unit so that the potential energy conversion unit supplies power to the output unit through flyback boost.
In the embodiment of the invention, after the first loop is conducted, the forward-flyback converter opens the loops with the same phase as the first loop in the second loop and the third loop so as to enable the input unit to supply power for the output unit; storing differential energy between the input unit and an output capacitor in the output unit into an inductor, and supplying power to the output unit through the inductor after the input energy of the input unit is reduced or the input unit is closed; when the input of the input unit is low voltage, the output unit is powered by any one of the following ways: the secondary winding and the inductor are overlapped and boosted to supply power for the output unit; shorting the output unit, so that the energy output by the output unit is stored in the inductor and then boosted to supply power for the output unit; the energy output by the output unit is stored in the potential energy conversion unit, so that the potential energy conversion unit supplies power to the output unit through flyback boost, the same-phase output is realized through the secondary connection of two windings which are connected in series in a reversing way after the positive and negative waveforms are input by the input unit, the direct forward output is realized when the input of the input unit is high voltage, and the technical effect of energy transmission is realized through series superposition or flyback boost when the input of the input unit is low voltage.
Preferably, if the flyback converter includes a fourth loop, the leakage inductance recycling and ZVS zero-voltage switching control method of the flyback converter includes: after the first loop is closed, the fourth loop is conducted, leakage inductance energy of a primary winding of the potential energy conversion unit is reversely boosted to charge a peak absorption capacitor, and the potential energy conversion unit supplies power to the output unit through mutual inductance; after the leakage inductance energy of the primary winding is released, the fourth loop is conducted so that the peak absorption capacitor supplies power for the output unit; after the energy of the peak absorption capacitor is smaller than a preset value, closing the fifth loop to enable the VDS drain-source voltage of the first switching tube to be 0; and the first loop is conducted, and after the leakage inductance energy of the primary winding is released, the input unit supplies forward and reverse excitation power to the output unit again.
Preferably, if the flyback converter includes a fifth loop, a sixth loop and a seventh loop, the control method for peak clipping, energy storage and valley filling of the flyback converter includes: when the input unit inputs a sine wave peak, a sixth loop is conducted so that the redundant energy of the sine wave peak is stored in a second capacitor; when the input unit input is sine wave valley, the second capacitor supplies power to the output unit through conducting a fifth loop or an eighth loop.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A flyback converter, comprising: the input unit, the first switching tube, the potential energy converter, output rectifying tube, inductance and output unit, wherein, the said potential energy converter is the transformer, if the said potential energy converter is the transformer, should include primary winding and secondary winding at least, when the input type of the said input unit is AC input, the said output rectifying tube includes positive half cycle output rectifying tube and negative half cycle output rectifying tube;
the input unit is respectively connected with the first switch tube and the potential energy converter to form a first loop;
the potential energy converter, the positive half-cycle output rectifying tube, the inductor and the output unit form a second loop;
when the input type of the input unit is alternating current input, the potential energy converter, the negative half-cycle output rectifying tube, the inductor and the output unit form a third loop;
the output unit comprises at least one output, and if the at least one output comprises a second capacitor connected in series with a first reverse diode, the flyback converter further comprises: the fourth switching tube is respectively connected with the input end of the inductor, the output end of the first reverse diode and the input end of the second capacitor;
the second capacitor, the fourth switching tube, the inductor and the output unit form a fifth loop;
the second capacitor, the output rectifier, the inductor and the secondary winding form a sixth loop.
2. The flyback converter of claim 1, further comprising: the peak value absorption capacitor is respectively connected with the input unit and the second switching tube, the second switching tube is respectively connected with the first switching tube and the peak value absorption capacitor, and the first capacitor is respectively connected with the inductor and the secondary winding;
the peak absorption capacitance, the second switching tube and the primary winding form a fourth loop.
3. The flyback converter of claim 1 wherein the at least one output further comprises: the second capacitor, or the second capacitor, the first reverse diode and a switching tube are sequentially connected in series, or the second capacitor is connected in series with two switching tubes with opposite directions, or the second capacitor is connected in series with a switching tube which is not conducted in two directions, or a resistor, or a switching tube, or an LED lamp.
4. The flyback converter of claim 1, further comprising: a fifth switching tube, wherein the fifth switching tube is respectively connected with the output end of the inductor and the secondary winding;
the secondary winding, the output rectifying tube, the inductor and the fifth switching tube form a seventh loop;
the second capacitor, the fourth switching tube, the inductor and the fifth switching tube form an eighth loop.
5. The flyback converter of claim 4 further comprising: the input capacitor is connected with the input unit in parallel, the sixth switching tube is used for replacing the positive half-cycle output rectifying tube, the seventh switching tube is used for replacing the negative half-cycle output rectifying tube, the eighth switching tube is used for replacing the first reverse diode, and the second diode is respectively connected with the seventh switching tube and the secondary winding.
6. The flyback converter of claim 1, wherein the type of input cell comprises at least one of: ac input, dc input, fluctuating voltage input, input capacitance and battery.
7. The flyback converter of claim 6 wherein the negative half-cycle output rectifier is connected to the output unit when the input unit is of the dc input type.
8. The flyback converter of claim 6 wherein the input cell is of the ac input type, the input cell is connected to the primary winding, and the transformer is equivalent to an isolated rectifier bridge.
9. A method of controlling a flyback converter according to any one of claims 1 to 8, comprising:
when the input unit is in high voltage, after the first loop is conducted, the loops with the same phase as the first loop in the second loop and the third loop are opened, so that the input unit supplies power for the output unit; simultaneously storing differential energy between the secondary winding and the voltage of the output unit to an inductance;
or when the first loop is conducted, the seventh loop is conducted, and input energy is stored in the inductor;
after the first loop is closed, the output unit is powered through the inductor, and the magnetic reset of the transformer is realized while the inductor is demagnetized;
when the input of the input unit is low voltage, the output unit is powered by any one of the following modes:
the secondary winding and the inductor are overlapped and boosted to supply power for the output unit;
shorting the output unit to enable energy to be stored in the inductor and then boosting to supply power for the output unit;
storing energy of the input unit into the potential energy converter so that the potential energy converter supplies power to the output unit through flyback boost;
if the flyback converter comprises a fourth loop and a fifth loop, the leakage inductance recycling and ZVS zero-voltage switch control method of the flyback converter comprises the following steps:
after the first loop is closed, the fourth loop is conducted, leakage inductance energy of a primary winding of the potential energy converter is reversely boosted to charge a peak absorption capacitor, and the potential energy converter supplies power to the output unit through mutual inductance;
after the leakage inductance energy of the primary winding is released, the fourth loop is conducted so that the peak absorption capacitor supplies power for the output unit;
after the energy of the peak absorption capacitor is smaller than a preset value, closing the fifth loop to enable the VDS drain-source voltage of the first switching tube to be 0;
the first loop is conducted, and after the leakage inductance energy of the primary winding is released, the input unit supplies forward and reverse excitation power to the output unit again;
if the flyback converter comprises a sixth loop and an eighth loop, the control method for peak clipping, energy storage and valley filling of the flyback converter comprises the following steps:
when the input unit inputs a sine wave peak, a sixth loop is conducted so that the redundant energy of the sine wave peak is stored in a second capacitor;
and when the input unit inputs sine wave valley, a fifth loop or an eighth loop is conducted, and the second capacitor supplies power for the output unit during valley filling.
CN202310516050.4A 2023-05-08 2023-05-08 Forward and reverse excitation converter and control method Active CN116526857B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047339A (en) * 2007-04-29 2007-10-03 北京新雷能有限责任公司 Zero voltage switch active clamp positive and negative violent changer
CN111884514A (en) * 2020-06-30 2020-11-03 广州金升阳科技有限公司 Positive and negative excitation type switching power supply circuit and control method thereof
CN112865547A (en) * 2021-03-12 2021-05-28 深圳原能电器有限公司 Multi-output converter and control method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047339A (en) * 2007-04-29 2007-10-03 北京新雷能有限责任公司 Zero voltage switch active clamp positive and negative violent changer
CN111884514A (en) * 2020-06-30 2020-11-03 广州金升阳科技有限公司 Positive and negative excitation type switching power supply circuit and control method thereof
CN112865547A (en) * 2021-03-12 2021-05-28 深圳原能电器有限公司 Multi-output converter and control method thereof

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