CN110995003B - Forward and reverse excitation type switching power supply circuit - Google Patents

Forward and reverse excitation type switching power supply circuit Download PDF

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Publication number
CN110995003B
CN110995003B CN201911120052.1A CN201911120052A CN110995003B CN 110995003 B CN110995003 B CN 110995003B CN 201911120052 A CN201911120052 A CN 201911120052A CN 110995003 B CN110995003 B CN 110995003B
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capacitor
diode
transformer
electrically connected
inductor
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CN110995003A (en
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张彦斌
刘晓旭
冯刚
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Mornsun Guangzhou Science and Technology Ltd
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Mornsun Guangzhou Science and Technology Ltd
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Priority to PCT/CN2020/126760 priority patent/WO2021093667A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a forward and reverse excitation type switching power supply circuit which comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, the 4 ends of the transformer T1 are electrically connected with one end of the capacitor C2 and the anode of the diode D1, the other end of the capacitor C2 is electrically connected with the anode of the diode D2 and the other end of the capacitor C3, the cathode of the diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of the diode D1 is electrically connected with one end of the capacitor C1 and the anode of the diode D3, and the cathode of the diode D3 is electrically connected with one end: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the 3 end of the transformer T1, and the other end of the inductor L2 is connected with the other end of the capacitor C1. The inductor is used as a transient current suppression device, and can effectively reduce the secondary peak current and short-circuit power consumption of the transformer and improve the output efficiency when the output is short-circuited or the output voltage is low.

Description

Forward and reverse excitation type switching power supply circuit
Technical Field
The invention relates to the field of switching power supplies, in particular to a forward and reverse excitation type switching power supply circuit.
Background
At present, a high-voltage constant-current charging converter is used in many fields, a flyback basic topology is generally adopted to be applied to the field of outputting high-voltage and low-power, the voltage is increased in a multi-winding mode or multi-stage voltage-multiplying rectification is formed by a capacitor and a diode so as to achieve the purpose of high output voltage, but the methods have certain limitations.
The mode of rectifying by multiple windings and then outputting in series is adopted, namely a plurality of flyback outputs are connected in series, the higher the output voltage is, the more windings are needed, the requirement on the size of the transformer is a challenge, and in addition, the pin pitch of the transformer needs to be further increased, so the size of the whole transformer is larger;
the voltage-multiplying mode of the capacitor and the diode is only suitable for application with small current, and the situation with large output current is limited.
The prior art discloses a specific circuit topology structure of a flyback circuit, as shown in fig. 1.
The transformer has high energy transmission efficiency, is simple in structure, can output high voltage only by one winding, and has voltage of one winding more than that of common flyback voltage-multiplying rectification, so that the output voltage can be increased to be higher under the same transformer condition.
However, there is a drawback that when the output voltage is short-circuited or the output voltage is lower than the voltage of the secondary winding, the efficiency is rapidly reduced, and the loss of the primary switching tube is rapidly increased, which affects the performance and reliability of the whole machine. Particularly for a product output by a constant current source, hiccup protection can not occur during short circuit, the short circuit is considered that output voltage is equal to forward voltage drop of a rectifier diode, at the moment, a circuit working in a forward state can reversely charge a capacitor C1 and a capacitor C2, transient charging current is extremely large, and the charging current can be refracted to the primary side of a transformer T1 due to the fact that the circuit is in the forward state, so that the primary side winding of the transformer T1 forms a large peak current, and losses of a magnetic core and a primary side switching tube are increased sharply. The method comprises the following specific steps:
when the primary side switching tube Q1 is turned on, the 2 end of the transformer T1 is positive, the 1 end is negative, and at this time, the path belongs to a forward path, and energy is transferred to the secondary side while exciting the primary side of the transformer T1, because the 1 end and the 3 end of the transformer T1 are dotted ends, and the path of secondary side energy transfer is that current flowing from the 3 end of the transformer T1 returns to the 4 end of the transformer T1 through the capacitor C1, the diode D3, the capacitor C3 and the capacitor C2 to form a forward loop, three capacitors are charged, and output voltage starts to be established. At this time, the capacitor C1 and the capacitor C2 are both in a negative-up-down state, and at this time, because the impedance of the charging loop is extremely small, the charging current is extremely large, and the charging current is refracted to the primary side of the transformer through the transformer T1, so that the peak value of the primary side current is extremely large, and the loss is increased sharply. After the charging is performed in a plurality of cycles, the voltages of the capacitor C1 and the capacitor C2 are in a positive-negative state, and the flyback loop charges the capacitor C1 through the diode D1, charges the capacitor C2 through the diode D2, and charges the capacitor C3 through the diode D1, the diode D3 and the diode D2 when the primary switch Q1 is turned off.
When the primary side switching tube Q1 is conducted, the forward loop is conducted, the primary side energy reversely charges the secondary side capacitor C1 and the capacitor C2 through the transformer T1, and the output voltage is equal to the sum of the three voltages of the capacitor C1, the capacitor C2 and the secondary side winding voltage. When the output voltage is higher than the voltage on the secondary winding of the transformer T1, the voltages of the capacitor C1 and the capacitor C2 do not show a positive-up negative state, the current generated by forward excitation is small, the loss is small, when the output is short-circuited or the output voltage is lower than the winding voltage, the forward excitation loop lasts for a long time, the current on the primary side of the refraction transformer T1 is larger, and the loss is larger.
Disclosure of Invention
Therefore, the present invention is to provide a forward/reverse-excited switching power supply circuit, which solves the problem that the loss of the primary winding and the primary switching tube increases sharply when the output voltage is low or the output is short-circuited.
The invention conception of the invention is as follows:
as shown in fig. 2, an inductor L2 is connected in series in the forward charging loop, and according to the characteristic that the inductor can suppress the rapid change of the current flowing through the inductor, the magnitude of the current flowing through the forward loop at the moment of charging can be greatly reduced, so that the peak value of the current refracted to the primary side is reduced, the product loss is further reduced, the stress of the primary side switching tube Q1 is not affected at all, and even the current stress and the transient voltage stress of the primary side switching tube can be reduced.
The invention is realized by the following technical scheme:
a forward and reverse excitation type transformer is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3; the 1 end and the 3 end of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the 3 end of the transformer T1, and the other end of the inductor L2 is connected with the other end of the capacitor C1.
As a second mode of connection of the inductor L2, one end of the inductor L2 is connected to the cathode of the diode D1, and the other end of the inductor L2 is connected to one end of the capacitor C1.
As a third mode of connection of the inductor L2, one end of the inductor L2 is connected to the other end of the capacitor C2, and the other end of the inductor L2 is connected to the anode of the diode D2.
As a fourth mode of connection of the inductor L2, one end of the inductor L2 is connected to one end of the capacitor C2, and the other end of the inductor L2 is connected to the 4-terminal of the transformer T1.
As a fifth mode of connection of the inductor L2, one end of the inductor L2 is connected to one end of the capacitor C1, and the other end of the inductor L2 is connected to the anode of the diode D3.
As a sixth mode of connection of the inductor L2, one end of the inductor L2 is connected to the cathode of the diode D3, and the other end of the inductor L2 is connected to one end of the capacitor C3.
Interpretation of terms:
electrically coupling: the connection mode includes direct connection or indirect connection, and also includes connection modes such as inductive coupling, for example, the "4 ends of the transformer are electrically connected with one end of the capacitor C2" in the invention is direct connection, and when the inductor L2 is connected between the 4 ends of the transformer and one end of the capacitor C2, the indirect connection is adopted.
Compared with the prior art, the invention has the following beneficial effects:
1. the novel forward and flyback circuit topology is provided, the characteristic that the inductor can inhibit current mutation is utilized, the problem of large short-circuit power consumption caused by the original forward and flyback circuit is solved, and the performance and reliability of a product are improved;
2. the circuit is simple, flexible and changeable, the inductor is connected to any point in the forward path in series, the same effect can be achieved by adding the inductor to any point in the forward path under the condition that the flyback loop is not influenced, and meanwhile, the circuit is low in cost, simple and easy to achieve product popularization.
Drawings
Fig. 1 is a conventional forward and reverse excitation type switching power supply circuit;
FIG. 2 is a schematic diagram of a flyback switching power supply circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a flyback switching power supply circuit according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a flyback switching power supply circuit according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram of a flyback switching power supply circuit according to a fourth embodiment of the present invention;
FIG. 6 is a schematic diagram of a fifth embodiment of a flyback switching power supply circuit according to the present invention;
fig. 7 is a schematic diagram of a flyback switching power supply circuit according to a sixth embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, the present invention will be further described below in conjunction with specific implementation circuits.
The forward and reverse switching power supply circuit is applied to a high-voltage constant-current converter, and mainly reduces transient charging current of a forward loop by adding an inductor L2 on the forward loop.
The specific idea is as follows: an inductor L2 is connected in series in a forward charging loop, when the output voltage is short-circuited or is low, the characteristic that the inductor can inhibit the sudden change of the current flowing through the inductor is utilized, the transient charging current of the forward loop is reduced to the greatest extent, the current peak value from the transformer to the primary side during forward is reduced, the loss is reduced, the short-circuit power consumption of a product is obviously reduced, the current peak value refracted to the primary side of the transformer is reduced, the current stress of a primary side switching tube can be reduced, and the reliability of the product is improved.
First embodiment
FIG. 2 is a schematic diagram of a first embodiment of a forward-flyback switching power supply circuit of the present invention, which includes a primary circuit, a transformer T1, and a secondary circuit, where the primary circuit includes a switch transistor Q1, a drain of the switch transistor Q1 is connected to the 2-terminal of the transformer T1, and a source of the switch transistor Q1 is grounded; the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3 and an inductor L2; the 1 end and the 3 end of the transformer T1 are the same name ends, the 4 end of the transformer T1 is connected with the anode of the diode D1 and one end of the capacitor C2, the other end of the capacitor C2 is connected with the anode of the diode D2 and the other end of the capacitor C3, the cathode of the diode D2 is connected with the 3 end of the transformer T1 and one end of the inductor L2, the other end of the inductor L2 is connected with the other end of the capacitor C1, one end of the capacitor C1 is connected with the cathode of the diode D1 and the anode of the diode D3, and the cathode of the diode D3 is connected with one end of the capacitor C39.
The working principle of the embodiment is as follows:
in the steady-state working process, when the primary side switching tube Q1 is switched off, the voltage of the primary side winding of the transformer T1 is reversed, and because of the relation of the same-name ends of the transformer, the secondary side induces the voltage with the positive end 4 and the negative end 3 to charge the capacitor C1 and the capacitor C2; when the primary side switch tube Q1 is conducted, the voltage of the primary side winding of the transformer T1 is reversed, due to the relation of the same name ends of the transformer, the secondary side winding induces that the end 3 is positive and the end 4 is negative, at the moment, the voltages of the capacitor C1, the capacitor C2 and the secondary side winding of the transformer T1 are connected in series to charge the capacitor C3, and the voltage at the two ends of the capacitor C3 is raised to high voltage.
After the inductor L2 is connected in series, the transient charging current of the forward loop is reduced to a great extent by utilizing the characteristic that the inductor can inhibit the sudden change of the current flowing through the inductor, so that the current peak value from the transformer to the primary side during forward is reduced, the loss is further reduced, and the short-circuit power consumption of the product is remarkably reduced.
Second embodiment
Fig. 3 shows a schematic diagram of a second embodiment of the forward-reverse switching power supply circuit of the present invention, which is different from the first embodiment in that: the inductor L2 of the second embodiment is serially connected between the diode D1 and the capacitor C1, one end of the inductor L2 is connected to the cathode of the diode D1, and the other end of the inductor L2 is connected to one end of the capacitor C1.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
Third embodiment
Fig. 4 shows a schematic diagram of a third embodiment of the forward-reverse switching power supply circuit of the present invention, which is different from the first embodiment in that: the inductor L2 of the third embodiment is serially connected between the diode D2 and the capacitor C2, one end of the inductor L2 is connected to the other end of the capacitor C2, and the other end of the inductor L2 is connected to the anode of the diode D2.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
Fourth embodiment
Fig. 5 shows a schematic diagram of a fourth embodiment of the forward-reverse switching power supply circuit of the present invention, which is different from the first embodiment in that: the inductor L2 of the fourth embodiment is serially connected between the terminal 4 of the transformer T1 and the capacitor C2, one terminal of the inductor L2 is connected to one terminal of the capacitor C2, and the other terminal of the inductor L2 is connected to the terminal 4 of the transformer T1.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
Fifth embodiment
Fig. 6 shows a schematic diagram of a fifth embodiment of the forward-reverse switching power supply circuit of the present invention, which is different from the first embodiment in that: the inductor L2 of the fifth embodiment is serially connected between the diode D3 and the capacitor C1, one end of the inductor L2 is connected to one end of the capacitor C1, and the other end of the inductor L2 is connected to the anode of the diode D3.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
Sixth embodiment
Fig. 7 shows a schematic diagram of a sixth embodiment of the forward-reverse switching power supply circuit of the present invention, which is different from the first embodiment in that: the inductor L2 of the sixth embodiment is connected in series between the diode D3 and the capacitor C3, one end of the inductor L2 is connected to the cathode of the diode D3, and the other end of the inductor L2 is connected to one end of the capacitor C3.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
In the above description of the preferred embodiments of the present invention, it should be noted that the above-mentioned preferred embodiments should not be considered as limiting the present invention, and it will be apparent to those skilled in the art that several modifications and decorations can be made without departing from the spirit and scope of the present invention, for example, a modification of the same name terminal of the transformer T1, a modification of the inductor L2 to other devices that can achieve the same function, such as a resistor, etc., and these modifications and decorations should also be considered as the protection scope of the present invention for all circuit modifications that can achieve this function, and the protection scope of the present invention should be limited by the scope of the appended claims.

Claims (6)

1. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the 3 end of the transformer T1, and the other end of the inductor L2 is connected with the other end of the capacitor C1.
2. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the cathode of the diode D1, and the other end of the inductor L2 is connected with one end of the capacitor C1.
3. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the other end of the capacitor C2, and the other end of the inductor L2 is connected with the anode of the diode D2.
4. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with one end of the capacitor C2, and the other end of the inductor L2 is connected with the 4 end of the transformer T1.
5. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with one end of the capacitor C1, and the other end of the inductor L2 is connected with the anode of the diode D3.
6. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the primary side circuit comprises a switching tube Q1, the input voltage is electrically connected with the end 1 of the transformer T1, the end 2 of the transformer T1 is connected with the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is electrically connected with the negative side of the input voltage, the secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3, and the end 1 and the end 3 of the transformer T1 are homonymous ends;
the 4 end of the transformer T1 is electrically connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is electrically connected with the anode of a diode D2 and the other end of a capacitor C3, the cathode of a diode D2 is electrically connected with the 3 end of the transformer T1 and the other end of the capacitor C1, the cathode of a diode D1 is electrically connected with one end of the capacitor C1 and the anode of a diode D3, and the cathode of the diode D3 is electrically connected with one end of a capacitor C3;
the method is characterized in that: the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected with the cathode of the diode D3, and the other end of the inductor L2 is connected with one end of the capacitor C3.
CN201911120052.1A 2019-11-15 2019-11-15 Forward and reverse excitation type switching power supply circuit Active CN110995003B (en)

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CN201911120052.1A CN110995003B (en) 2019-11-15 2019-11-15 Forward and reverse excitation type switching power supply circuit
PCT/CN2020/126760 WO2021093667A1 (en) 2019-11-15 2020-11-05 Forward and flyback switch power supply circuit

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CN110995003B true CN110995003B (en) 2021-03-05

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