CN116155107A - Isolated bipolar output self-equalizing DC-DC converter - Google Patents

Isolated bipolar output self-equalizing DC-DC converter Download PDF

Info

Publication number
CN116155107A
CN116155107A CN202211696177.0A CN202211696177A CN116155107A CN 116155107 A CN116155107 A CN 116155107A CN 202211696177 A CN202211696177 A CN 202211696177A CN 116155107 A CN116155107 A CN 116155107A
Authority
CN
China
Prior art keywords
diode
transformer
output
capacitor
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211696177.0A
Other languages
Chinese (zh)
Inventor
邾玢鑫
周丽娟
覃团发
郑含博
胡永乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Three Gorges University CTGU
Original Assignee
China Three Gorges University CTGU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Three Gorges University CTGU filed Critical China Three Gorges University CTGU
Priority to CN202211696177.0A priority Critical patent/CN116155107A/en
Publication of CN116155107A publication Critical patent/CN116155107A/en
Pending legal-status Critical Current

Links

Images

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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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

Landscapes

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

Abstract

An isolated bipolar output self-equalizing DC-DC converter comprises a flyback converter and a bipolar unit; the flyback converter comprises a direct current input source u in Power switch S 1 Excitation inductance L m Transformer T, output diode D 1 Output capacitance C 1 The method comprises the steps of carrying out a first treatment on the surface of the The bipolar unit comprises an inductor L 2 Diode D 2 Capacitance C 2 Capacitance C p . Compared with the traditional converter, the DC-DC converter greatly reduces the problem of unbalanced voltage caused by the cross adjustment rate when the traditional flyback converter outputs bipolar output, realizes the automatic voltage equalizing effect of a bipolar output circuit, and reduces voltage deviationThe method comprises the steps of carrying out a first treatment on the surface of the The DC-DC converter has the advantages of simple circuit topology, high transformer utilization rate and lower difficulty in control system design and implementation, and is suitable for occasions needing bipolar voltage power supply.

Description

Isolated bipolar output self-equalizing DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to an isolated bipolar output self-equalizing DC-DC converter.
Background
Along with the development of the internet of things, our electronic equipment is more and more informationized, intelligent and complicated, and a bipolar voltage output auxiliary power supply is required for occasions such as a control system, a driving system, various sampling circuits and the like of a communication machine room to supply power. The common multi-output converter topology comprises forward, flyback, push-pull and the like, wherein the flyback converter has the advantages of simple topological structure, electrical isolation between input and output, wide boosting and step-down ranges and the like, and is widely applied to medium and small power switching power supplies. The bipolar voltage output can be realized by increasing the number of the flyback converter winding groups, and the power supply requirement of the equipment is met. However, the output voltages of the conventional flyback multiplexers are prone to voltage imbalance when the loads are inconsistent due to the problem of the cross adjustment rate, and many factors affecting the cross adjustment rate mainly include: the leakage inductance of the transformer, the clamping voltage of the front end of the converter and the unbalance degree of the output load. The problem of the cross-regulation of the multiple output converter has been a difficulty and hot spot for the study of power domain practitioners.
At present, the improvement measure for the cross adjustment rate is mainly divided into two aspects of control and circuit topology, for example, patent document with the grant publication number of CN105322798B discloses a multi-output flyback converter, a voltage type negative feedback loop is arranged in an output circuit of the converter, and the transmission of energy is controlled by a control mode formed by the voltage negative feedback loop and PWM control, so that the output voltage of an auxiliary circuit can also keep high stable precision. However, the increased switching of the converter in the auxiliary circuit increases the timing control difficulty.
The application publication No. CN114679065A discloses a multi-output power supply with high efficiency and low cross adjustment rate, and the converter is based on synchronous rectification and output regulation circuits connected to each output of the multi-output DC/DC power supply with a Flyback topology structure, and performs secondary adjustment on output voltage through the synchronous rectification and output regulation circuits, and meanwhile replaces a freewheeling diode on the secondary side of the multi-output DC/DC power supply with a low-loss MOS (metal oxide semiconductor) tube, so that output loss is reduced, the cross adjustment rate of the multi-output power supply is improved, and the technical problems of more circuit elements and complex control of the conventional multi-output power supply cross adjustment rate optimization scheme are solved. However, the converter replaces the rectifying diode with two MOS tubes connected in common, which increases the loss of the circuit and results in low transmission efficiency of the power supply.
Disclosure of Invention
The method aims to solve the problem that the output voltage of the traditional bipolar output flyback converter is easily influenced by load disturbance to generate deviation. The invention provides an isolated bipolar output self-equalizing DC-DC converter based on a traditional multi-winding output converter, which comprises a direct current input source, a basic flyback converter and a bipolar unit. Compared with the traditional converter, the DC-DC converter greatly reduces the problem of unbalanced voltage caused by the cross adjustment rate when the traditional flyback converter outputs bipolar, realizes the automatic voltage equalizing effect of the bipolar output circuit and reduces voltage deviation. Meanwhile, the DC-DC converter has simple circuit topology, high transformer utilization rate and lower difficulty in control system design and implementation, and is suitable for occasions needing bipolar voltage power supply.
The technical scheme adopted by the invention is as follows:
an isolated bipolar output self-equalizing DC-DC converter comprises a flyback converter and a bipolar unit;
the flyback converter comprises a direct current input source u in Power switch S 1 Excitation inductance L m Transformer T, output diode D 1 Output capacitance C 1 The method comprises the steps of carrying out a first treatment on the surface of the The flyback converter is connected as follows:
excitation inductance L m The upper ends of the primary windings L of the transformer T are respectively connected with p Upper end, transfusionPower-in source u in Is a positive electrode of (a);
excitation inductance L m The lower ends of the power switches S are respectively connected with 1 Is connected to the primary winding L of the transformer T p A lower end;
power switch S 1 Is connected with an input power supply u in Is a negative electrode of (a);
secondary winding L of transformer T s The upper end is connected with a diode D 1 Anode connection of diode D 1 Cathode connection capacitor C of (2) 1 Capacitance C 1 The other end of the transformer T is connected with a secondary winding L s Is arranged at the lower end of the lower part;
the bipolar unit comprises an inductor L 2 Diode D 2 Capacitance C 2 Capacitance C p The method comprises the steps of carrying out a first treatment on the surface of the The connection form of the bipolar unit is as follows:
capacitor C p The other ends of (a) are respectively connected with a diode D 2 Anode, inductance L of (2) 2 Is a member of the group; diode D 2 Cathode connection capacitor C of (2) 2 One end of (C) is connected to 2 Is connected with the inductor L at the other end 2 Is arranged at the other end of the tube;
the connection relationship between the flyback converter and the bipolar unit is as follows:
secondary winding L of transformer T s The upper end is connected with a capacitor C p Capacitance C 1 The other ends of (a) are respectively connected with a capacitor C 2 One end of diode D 2 A cathode of (a);
load R 1 One end of (a) is connected with a capacitor C 1 Is loaded with R 1 Is connected with the secondary winding L of the transformer s Is arranged at the lower end of the lower part;
load R 2 One end of (a) is connected with diode D 2 Is loaded with R 2 Is connected with the inductor L at the other end 2 And the other end of (2).
The power switch S 1 The duty cycle of which may vary between 0 and 1.
According to the difference of converter switch tube state, can divide into 2 working processes with the circuit, do respectively: power switch S 1 Diode D when conducting 1 、D 2 Turning off; power switch S 1 Diode D when turned off 1 、D 2 Conducting. The method comprises the following steps:
(1) Power switch S 1 Diode D when conducting 1 、D 2 Turning off; input voltage is applied to primary winding of transformer, primary winding L p The current rises and the energy stored in the transformer increases and at the same time energy is transferred to the secondary winding L s Diode D 1 、D 2 Bear reverse voltage cut-off, at this time, the secondary winding L of the transformer s Capacitance C being a bipolar cell p And inductance L 2 Charging and outputting capacitance C 1 For the load R 1 Power supply, output capacitor C 2 For the load R 2 And (5) supplying power. Excitation inductance L m Secondary winding L s Inductance L 2 The terminal voltage expression is as follows:
Figure BDA0004023545900000031
(2) Power switch S 1 Diode D when turned off 1 、D 2 Conducting; transformer secondary coil L s Current drops, capacitance C p To capacitor C 1 Discharge, inductance L 2 To capacitor C 2 And (5) discharging. Excitation inductance L m Secondary winding L s Inductance L 2 The terminal voltage expression is as follows:
Figure BDA0004023545900000032
wherein: n is the turns ratio of the primary side and the secondary side of the transformer,
Figure BDA0004023545900000033
/>
during the whole switching period, according to the principle of inductive volt-second balance, the secondary winding L of the transformer s And inductance L 2 Is 0, and is composed of L s →C p →L 2 →C 2 →L s Capacitor C obtained by loop KVL principle p Voltage u of (2) cp Equal to the bipolar unit output voltage u o2 . During the switch off period, diode D 1 Conduction, secondary winding L s Through loop L s (C p )→D 1 →C 1 →L s (C p ) To capacitor C 1 Charging; capacitor C p Through diode D 1 And output capacitance C 1 Parallel connection, therefore, capacitor C p Voltage u of (2) cp Equal to the output voltage u of the secondary winding of the transformer o1 . When the capacitor C p When the voltage is large enough, the output voltages of the secondary winding of the transformer and the bipolar unit are equal, and the automatic voltage equalizing of the bipolar output flyback converter is realized.
The invention relates to an isolated bipolar output self-voltage-equalizing DC-DC converter, which has the following technical effects:
1) The converter greatly reduces the problem of unbalanced voltage caused by the cross adjustment rate when the traditional flyback converter outputs bipolar output by adding a bipolar unit, realizes the automatic voltage equalizing effect of the bipolar output circuit, and reduces voltage deviation.
2) The converter has simple circuit topology, and only one switch is used to reduce the design difficulty of a control system
3) The transformer of the converter has high utilization rate, and the control system has lower design and realization difficulty, and is suitable for occasions needing bipolar voltage power supply.
Wherein: the conditions in fig. 2 and 4 are the same.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a conventional bipolar output flyback converter circuit;
FIG. 2 is a simulation diagram of the output voltage waveform of a basic dual-winding output flyback converter under two-path load imbalance;
FIG. 3 is a schematic circuit diagram of the present invention;
fig. 4 is a simulation diagram of output voltage waveforms under two-path load imbalance when the present invention is employed.
Detailed Description
As can be seen from fig. 1, the flyback converter adopting the conventional bipolar output has two secondary windings, and the voltage deviation is generated when the load is unbalanced due to the crossover adjustment rate caused by the leakage inductance of the circuit, so that the two-way output voltage is difficult to maintain balanced.
As can be seen from fig. 2, the output voltage difference of the conventional bipolar flyback converter is 10V when the load is unbalanced, and it is difficult to meet the requirement of the output voltage under the load unbalance.
As shown in fig. 3, an isolated bipolar output self-equalizing DC-DC converter includes a basic flyback converter and a bipolar unit. Wherein the basic flyback converter comprises a direct current input source u in A power switch S 1 Excitation inductance L m Ideal transformer T, output diode D 1 Output capacitance C 1 . The bipolar unit comprises an inductor L 2 Diode D 2 Capacitance C 2 Capacitor C p 。
The basic flyback converter is connected as follows:
excitation inductance L m The upper ends of the primary windings L of the transformer T are respectively connected with p Upper end, input power u in Is a positive electrode of (a);
excitation inductance L m The lower ends of the power switches S are respectively connected with 1 Is connected to the primary winding L of the transformer T p A lower end;
power switch S 1 Is connected with an input power supply u in Is a negative electrode of (a);
secondary winding L of transformer T s The upper end is connected with a diode D 1 Anode connection of diode D 1 Cathode connection capacitor C of (2) 1 Capacitance C 1 The other end of the transformer T is connected with a secondary winding L s Is arranged at the lower end of the lower part;
the bipolar unit comprises an inductor L 2 Diode D 2 Capacitance C 2 Capacitance C p The method comprises the steps of carrying out a first treatment on the surface of the The connection form of the bipolar unit is as follows:
capacitor C p The other ends of (a) are respectively connected with a diode D 2 Anode, inductance L of (2) 2 Is a member of the group; diode D 2 Cathode connection capacitor C of (2) 2 One end of (C) is connected to 2 Is connected with the inductor L at the other end 2 Is arranged at the other end of the tube;
the connection relationship between the basic flyback converter and the bipolar unit is as follows:
secondary winding L of transformer T s The upper end is connected with a capacitor C p Capacitance C 1 The other ends of (a) are respectively connected with a capacitor C 2 One end of diode D 2 A cathode of (a);
load R 1 And diode D 1 Cathode and capacitor C of (2) 1 Connected at one end of the load R 1 And the other end of the ideal transformer secondary winding L s Lower end of (C) and capacitor C 1 Is connected with the intersection point connected with the other end of the frame; load R 2 And diode D 2 Cathode and capacitor C of (2) 2 Connected at one end of the load R 2 And the other end of (2) is connected with inductance L 2 Lower end of (C) and capacitor C 2 Is connected with the intersection point connected with the other end of the frame.
Power switch tube S 1 The duty cycle of which may vary between 0 and 1. According to the different states of the switching tube of the converter, the circuit can be divided into 2 working processes, namely: power switch S 1 Diode D when conducting 1 、D 2 Turning off; power switch S 1 Diode D when turned off 1 、D 2 Conducting. The method comprises the following steps:
(1) Power switch tube S 1 Diode D when conducting 1 、D 2 And (5) switching off. Input voltage is applied to primary winding of transformer, primary winding L p The current rises and the energy stored in the transformer increases and at the same time energy is transferred to the secondary winding L s Diode D 1 、D 2 Bear reverse voltage cut-off, at this time, the secondary winding L of the transformer s Capacitance C being a bipolar cell p And inductance L 2 Charging and outputting capacitance C 1 Is a loadR 1 Power supply, output capacitor C 2 For the load R 2 And (5) supplying power. Excitation inductance L m Secondary winding L s Inductance L 2 The terminal voltage expression is as follows:
Figure BDA0004023545900000051
(2) Power switch S 1 Diode D when turned off 1 、D 2 Conducting. Transformer secondary coil L s Current drops, capacitance C p To capacitor C 1 Discharge, inductance L 2 To capacitor C 2 And (5) discharging. Excitation inductance L m Secondary winding L s Inductance L 2 The terminal voltage expression is as follows:
Figure BDA0004023545900000061
wherein N is the turns ratio of the primary side and the secondary side of the transformer,
Figure BDA0004023545900000062
during the whole switching period, according to the principle of inductive volt-second balance, the secondary winding L of the transformer s And inductance L 2 Is 0, and is composed of L s →C p →L 2 →C 2 →L s Capacitor C obtained by loop KVL principle p Voltage u of (2) cp Equal to the bipolar unit output voltage u o2 . During the switch off period, diode D 1 Conduction, secondary winding L s Through loop L s (C p )→D 1 →C 1 →L s (C p ) To capacitor C 1 Charging; capacitor C p Through diode D 1 And output capacitance C 1 Parallel connection, therefore, capacitor C p Voltage u of (2) cp Equal to the output voltage u of the secondary winding of the transformer o1 . When the capacitor C p When the voltage is large enough, the output voltages of the secondary winding of the transformer and the bipolar unit are equal, so that bipolar output flyback conversion is realizedAutomatic pressure equalizing of the device.
As can be seen from FIG. 4, when the circuit provided by the invention is adopted, the output voltage difference value is only 0.3V under the condition that two paths of loads are unbalanced, compared with the output voltage difference value of the traditional bipolar flyback converter, the output voltage difference value is effectively reduced, the automatic voltage equalizing of the output voltage is realized only by the circuit, and the problem of unbalanced output voltage is solved.

Claims (4)

1. An isolated bipolar output self-equalizing DC-DC converter is characterized in that: the converter comprises a flyback converter and a bipolar unit;
the flyback converter comprises a direct current input source u in Power switch S 1 Excitation inductance L m Transformer T, output diode D 1 Output capacitance C 1 The method comprises the steps of carrying out a first treatment on the surface of the The flyback converter is connected as follows:
excitation inductance L m The upper ends of the primary windings L of the transformer T are respectively connected with p Upper end, input power u in Is a positive electrode of (a);
excitation inductance L m The lower ends of the power switches S are respectively connected with 1 Is connected to the primary winding L of the transformer T p A lower end;
power switch S 1 Is connected with an input power supply u in Is a negative electrode of (a);
secondary winding L of transformer T s The upper end is connected with a diode D 1 Anode connection of diode D 1 Cathode connection capacitor C of (2) 1 Capacitance C 1 The other end of the transformer T is connected with a secondary winding L s Is arranged at the lower end of the lower part;
the bipolar unit comprises an inductor L 2 Diode D 2 Capacitance C 2 Capacitance C p The method comprises the steps of carrying out a first treatment on the surface of the The connection form of the bipolar unit is as follows:
capacitor C p The other ends of (a) are respectively connected with a diode D 2 Anode, inductance L of (2) 2 Is a member of the group; diode D 2 Cathode connection capacitor C of (2) 2 One end of (C) is connected to 2 Is connected with the inductor L at the other end 2 Is arranged at the other end of the tube;
the connection relationship between the flyback converter and the bipolar unit is as follows:
secondary winding L of transformer T s The upper end is connected with a capacitor C p Capacitance C 1 The other ends of (a) are respectively connected with a capacitor C 2 One end of diode D 2 A cathode of (a);
load R 1 One end of (a) is connected with a capacitor C 1 Is loaded with R 1 Is connected with the secondary winding L of the transformer s Is arranged at the lower end of the lower part;
load R 2 One end of (a) is connected with diode D 2 Is loaded with R 2 Is connected with the inductor L at the other end 2 And the other end of (2).
2. The isolated bipolar output self-equalizing DC-DC converter according to claim 1, wherein: the power switch S 1 The duty cycle of which can vary between 0 and 1.
3. An isolated bipolar output self-equalizing DC-DC converter according to claim 1 or 2, characterized in that: according to the difference of converter switch tube state, can divide into 2 working processes with the circuit, do respectively: power switch S 1 Diode D when conducting 1 、D 2 Turning off; power switch S 1 Diode D when turned off 1 、D 2 Conducting; the method comprises the following steps:
(1) Power switch S 1 Diode D when conducting 1 、D 2 Turning off; input voltage is applied to primary winding of transformer, primary winding L p The current rises and the energy stored in the transformer increases and at the same time energy is transferred to the secondary winding L s Diode D 1 、D 2 Bear reverse voltage cut-off, at this time, the secondary winding L of the transformer s Capacitance C being a bipolar cell p And inductance L 2 Charging and outputting capacitance C 1 For the load R 1 Power supply, output capacitor C 2 For the load R 2 Supplying power; excitation inductance L m Secondary winding L s Electric powerSense of L 2 The terminal voltage expression is as follows:
Figure FDA0004023545890000021
(2) Power switch S 1 Diode D when turned off 1 、D 2 Conducting; transformer secondary coil L s Current drops, capacitance C p To capacitor C 1 Discharge, inductance L 2 To capacitor C 2 Discharging; excitation inductance L m Secondary winding L s Inductance L 2 The terminal voltage expression is as follows:
Figure FDA0004023545890000022
wherein: n is the turns ratio of the primary side and the secondary side of the transformer,
Figure FDA0004023545890000023
/>
4. an automatic voltage equalizing method of a DC-DC converter according to claim 1 or 2, characterized in that:
during the whole switching period, the secondary coil L of the transformer s And inductance L 2 Is 0, and is composed of L s →C p →L 2 →C 2 →L s The loop KVL principle can obtain the capacitance C p Voltage u of (2) cp Equal to the bipolar unit output voltage u o2 ；
During the switch off period, diode D 1 Conduction, secondary winding L s Through loop L s (C p )→D 1 →C 1 →L s (C p ) To capacitor C 1 Charging; capacitor C p Through diode D 1 And output capacitance C 1 Parallel connection, therefore, capacitor C p Voltage u of (2) cp Equal to the output voltage u of the secondary winding of the transformer o1 The method comprises the steps of carrying out a first treatment on the surface of the When the capacitor C p When sufficiently large, the transformerThe output voltages of the secondary winding and the bipolar unit are equal, so that the automatic voltage equalizing of the bipolar output flyback converter is realized.
CN202211696177.0A 2022-12-28 2022-12-28 Isolated bipolar output self-equalizing DC-DC converter Pending CN116155107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211696177.0A CN116155107A (en) 2022-12-28 2022-12-28 Isolated bipolar output self-equalizing DC-DC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211696177.0A CN116155107A (en) 2022-12-28 2022-12-28 Isolated bipolar output self-equalizing DC-DC converter

Publications (1)

Publication Number Publication Date
CN116155107A true CN116155107A (en) 2023-05-23

Family

ID=86340059

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211696177.0A Pending CN116155107A (en) 2022-12-28 2022-12-28 Isolated bipolar output self-equalizing DC-DC converter

Country Status (1)

Country Link
CN (1) CN116155107A (en)

Similar Documents

Publication Publication Date Title
Zhao et al. Single-phase improved active clamp coupled-inductor-based converter with extended voltage doubler cell
Faraji et al. Soft-switched non-isolated high step-up multi-port DC-DC converter for hybrid energy system with minimum number of switches
CN107733221B (en) Multi-unit coupling inductance switch capacitor network high-gain direct current converter
CN107546959B (en) Switching power supply, electronic equipment and switching power supply control method
CN110798073A (en) Wide voltage range output current feed converter
CN111525809B (en) High-frequency hybrid direct-current converter with adjustable output voltage
CN110445387B (en) Topological structure and control method of formation and grading power supply
CN113783418A (en) Low-input-current-ripple high-gain soft-switching direct-current converter
CN112087143A (en) Quasi-parallel resonant converter with multi-end input and single-end output
CN215934730U (en) DC-DC converter with high step-up ratio
CN103441690B (en) Method for controlling combined converter for achieving tight adjusting output with high-frequency alternating-current side connected in series
CN109713905B (en) CCM/DCM multiplexing single-coupling inductance multi-output buck converter
CN112564080A (en) Novel IIOS converter with low-loss LC-PBU
CN107171563A (en) The combined converter of tight adjustment output
Li et al. An efficiency-oriented two-stage structure employing partial power regulation
WO2022179564A1 (en) Bridgeless voltage-drop power factor correction circuit
Bi et al. H-type structural boost three-level DC-DC converter with wide voltage-gain range for fuel cell applications
CN112953231B (en) Magnetic integration series type flyback circuit with half-bridge direct current bus capacitor voltage balancing capability
CN116155107A (en) Isolated bipolar output self-equalizing DC-DC converter
CN114710036A (en) High-efficiency boost converter for small UPS and control method thereof
CN110518793B (en) Non-isolated bridge arm alternating type direct current transformer based on Boost principle
CN107634645B (en) Output branch structure based on coupling inductance
CN116232073A (en) Bipolar output self-equalizing circuit
CN116207991A (en) Bipolar output cross adjustment rate improving circuit
CN108551262A (en) A kind of high-gain modularization large capacity isolated form DC/DC converters

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination