CN111262449A - Multi-mode forward soft-switching high-performance switching power supply circuit - Google Patents
Multi-mode forward soft-switching high-performance switching power supply circuit Download PDFInfo
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- 238000004804 winding Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
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- 230000005347 demagnetization Effects 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- 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
- H02M3/33523—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 with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of switching power supplies, in particular to a multi-mode forward soft switching high-performance switching power supply circuit, which comprises an MCU (microprogrammed control unit), a main circuit unit, a transformer unit, a rectifying and filtering unit and a fault detection unit, wherein the MCU is connected with the main circuit unit; the MCU main control unit is connected with gate poles of chopper power MOS transistors Q1, Q2 and Q3 in the main circuit unit, and is also connected with the fault detection unit and comprises circuits such as a main control chip and the like; the fault detection unit 5 is respectively connected with the source and drain of chopping power MOS transistors Q1, Q2 and Q3 in the main circuit unit, and the fault detection unit 5 is also connected with a resistor R5 in the rectifying and filtering unit. The invention solves the problem of large loss caused by hard switching of the switching tube and the diode in the forward power converter, reduces the switching loss and improves the efficiency.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a multi-mode forward soft switching high-performance switching power supply circuit.
Background
With the development of power electronic technology, power modules are widely applied in various fields, and a switching power supply gradually replaces a linear power supply and becomes a mainstream power supply. The power switch tube of the switch power supply performs on and off actions under the action of PWM (pulse width modulation), and chops the bus voltage into pulse voltage. The drive control circuit controls the duty ratio of the PWM to ensure the stability of the voltage. In a medium-low power DC-DC switching power supply, the most common circuit topologies are a flyback switching power supply and a forward circuit.
A transformer in the forward power converter has leakage inductance, when a switching tube on a primary side and a rectifying diode on a secondary side are turned off, high reverse voltage peaks are generated at two ends of the switching tube and the diode, the voltage peaks may exceed the withstand voltage of the switching tube and the diode to damage the switching tube and the diode, the amplitude of the reverse voltage is high, the switching tube is easy to damage, and therefore measures must be taken to inhibit the reverse voltage peaks; the transformer in the forward power converter is unidirectional excitation, before the second switching period begins, the magnetic core of the transformer must be demagnetized to reset the magnetic core, the forward power converter can reliably work, the reverse current induced by the secondary winding NS cannot circulate due to the reverse bias of the forward rectifier diode, the existing zero-voltage switching-on technology in the market depends on zero-voltage switching-on technology, but the zero-voltage switching-on technology can generate an unconnected working state when the load is small, and the use of the power supply is not facilitated.
Therefore, in view of the above situation, there is an urgent need to develop a high-performance switching power supply circuit with multi-mode forward soft switching to overcome the shortcomings in the current practical application.
Disclosure of Invention
The present invention is directed to a switching power supply circuit with high performance of multi-mode forward soft switching, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-mode forward soft switching high-performance switching power supply circuit comprises an MCU (microprogrammed control unit), a main circuit unit, a transformer unit, a rectifying and filtering unit and a fault detection unit;
the MCU main control unit is connected with gate poles of chopping power MOS tubes Q1, Q2 and Q3 in the main circuit unit and is also connected with the fault detection unit, and the MCU main control unit carries out mode selection and time sequence control on the chopping power MOS tubes Q1, Q2 and Q3 in the main circuit unit by collecting data of the fault detection unit and carries out protection and performance adjustment on the whole main control system;
the fault detection unit is respectively connected with the source and drain electrodes of chopping power MOS tubes Q1, Q2 and Q3 in the main circuit unit, is also connected with a resistor R5 in the rectifying and filtering unit, and is used for detecting load change and voltage and current at two ends of the chopping power MOS tubes Q1, Q2 and Q3, processing data and then sending related data to the MCU control unit;
the main circuit unit is connected with the rectifying and filtering unit through the transformer unit and serves as a transformer switch circuit, so that the chopping effect on a bus voltage switch can be achieved, different control modes and conduction sequences can be selected under the cooperation of the MCU main control unit, the efficiency of the switch power supply is improved, the problem of demagnetization is solved, reverse voltage is eliminated, the switch power supply can work more stably, the problem of discontinuous load is solved, and the overall performance of the switch power supply is improved;
the main circuit unit 2 comprises capacitors C1 and C1, resistors R1, R1 and R1, freewheeling diodes D1, D1 and D1, chopper power MOS transistors Q1, Q1 and Q1, wherein the drain of the chopper power MOS transistor Q1 is connected with a network formed by the capacitors C1 and the resistors R1, the other ends of the capacitors C1 and the resistors R1 are connected with the cathode of the chopper diode D1, the anode of the freewheeling diode D1 is connected with the drain of the chopper power MOS transistor Q1, the source of the chopper power MOS transistor Q1 is connected with the network formed by the capacitors C1 and the resistors R1, the other ends of the capacitors C1 and the resistors R1 are connected with the cathode of the chopper diode D1, the anode of the freewheeling diode D1 is connected with one ends of the resistors R1 and R1, and the source of the chopper power MOS transistor Q1 is connected with the source of the chopper diode D1;
the rectifying and filtering unit comprises a double-body diode D4, a diode D5, an inductor L1, a resistor R5 and a capacitor C3, wherein the anode of the double-body diode D4 is connected with a No. 4 secondary side coil, the cathode of the double-body diode D4 is connected with one end of the inductor L1 and is connected with Vout, one end of the capacitor C3 is connected with the ground, the other end of the capacitor C3 is connected with the Vout, the cathode of the double-body diode D5 is connected with the cathode of the double-body diode D4, and the anode of the double-body diode D5 is connected with GND.
As a further scheme of the invention: the MCU main control unit comprises a main control chip circuit.
As a further scheme of the invention: the transformer unit comprises a transformer T1, and the transformer T1 comprises a No. 1 primary coil, a No. 2 primary coil, a No. 3 primary coil, a No. 4 secondary coil, a transformer framework and a No. 5 magnet.
As a further scheme of the invention: the drain electrode of the chopping power MOS tube Q3 is connected with the No. 2 primary side coil of the transformer unit, and the cathode of the fly-wheel diode D3 is connected with the No. 3 primary side coil of the transformer unit.
As a further scheme of the invention: one end of the No. 1 primary side coil is connected with a source electrode of a chopping power MOS tube Q1, the other end of the No. 1 primary side coil is connected with a drain electrode of a chopping power MOS tube Q2, one ends of the No. 2 primary side coil and the No. 3 primary side coil are connected with Vin, one end of the No. 4 secondary side coil is connected with an anode of a diode D4 in the rectifying and filtering unit, and the other end of the No. 4 secondary side coil is connected with GND.
As a further scheme of the invention: the transformer T1 employs a multi-stage winding pattern.
As a further scheme of the invention: the No. 1 primary coil is independently wound, and the No. 2 primary coil and the No. 3 primary coil are wound in parallel.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a multi-mode forward soft switching high-performance switching power supply circuit, solves the problem of large loss caused by hard switching of a switching tube and a diode in a forward power supply converter, reduces the switching loss and improves the efficiency; the problem of demagnetization and reset of a magnetic core of a transformer in the forward power converter is solved, so that the forward power converter can work reliably and stably for a long time; the reverse voltage spikes at the two ends of the switching tube and the diode when the switching tube at the primary side and the rectifying diode at the secondary side are turned off are reduced, so that the reliability of the forward power converter is improved, the problem of discontinuous work of the switching power supply at low load is well solved, the circuit of the forward power converter is not more complicated, and the cost is reduced;
2. the invention adds the MCU main control unit, realizes the real-time control of the chopping MOS tube, can select different modes to control the on and off of the MOS tube according to different working conditions, improves the stability of the output voltage of the whole power circuit, ensures that the reverse voltage at two ends of the MOS tube does not exceed a set value, and well protects the safety of the MOS tube;
3. the invention adopts the main circuit unit, realizes the mode switching of the switching power supply, effectively improves the problems of magnetic reset and current cutoff and improves the performance of the switching power supply;
4. the invention adopts the multi-mode transformer winding technology, improves the stability of the output voltage of the switching power supply, changes the performance problem caused by sudden change of load and is beneficial to the problem of magnetic reset;
5. the invention adds the fault detection unit, realizes the real-time monitoring of the voltage and the current of the load end and the voltage and the current of the MOS tube, is beneficial to the high-performance work of the MOS tube and the transformer, and improves the safety and the reliability of the switching power supply;
6. the invention not only adopts the automatic adjustment mode, but also improves the applicability of the power supply through the selection of different modes, is beneficial to the power supply to be suitable for different load states, adopts the system self-setting mode, can integrate the current working information of the power supply, further ensures the function, adjusts the working mode, and enables the output to meet the design requirement;
7. the invention adopts the rectification filtering follow current circuit, and in the aspect of diode selection, in order to make the temperature coefficient reach consistency, the diode with double bodies packaged in parallel is selected, so that the current endurance of the diode is realized, the consistency of the heating coefficient is ensured, and the service life and the performance of the switching power supply are improved.
Drawings
Fig. 1 is a schematic structural diagram of a multi-mode forward soft-switching high-performance switching power supply circuit.
Fig. 2 is a working flow chart of a multi-mode forward soft switching high-performance switching power supply circuit.
In the figure: the device comprises a 1-MCU main control unit, a 2-main circuit unit, a 3-transformer unit, a 4-rectification filter unit and a 5-fault detection unit.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1, in an embodiment of the present invention, a multi-mode forward soft switching high-performance switching power supply circuit includes an MCU main control unit 1, a main circuit unit 2, a transformer unit 3, a rectifier filter unit 4, and a fault detection unit 5; the MCU main control unit 1 is connected with gate poles of chopper power MOS tubes Q1, Q2 and Q3 in the main circuit unit 2, the MCU main control unit 1 is also connected with the fault detection unit 5, the MCU main control unit 1 comprises circuits such as a main control chip, and the MCU main control unit 1 carries out mode selection and time sequence control on the chopper power MOS tubes in the main circuit unit 2 by acquiring data of the fault detection unit 5, and protects and regulates the performance of the whole main control system, so that the output voltage and current meet the design requirements; the fault detection unit 5 is respectively connected with the source and drain electrodes of chopper power MOS tubes Q1, Q2 and Q3 in the main circuit unit 2, the fault detection unit 5 is also connected with a resistor R5 in the rectifying and filtering unit 4, the fault detection unit 5 is used for detecting load change and voltage and current at two ends of the chopper power MOS tubes, the fault detection unit 5 ensures the transient performance of the power supply, processes data and sends related data to the MCU control unit, the safety and reliability of the switching power supply are ensured, and further the stable output of the power supply is ensured; the main circuit unit 2 is connected with the rectifying and filtering unit 4 through the transformer unit 3, and the main circuit unit 2 is used as a transformer switching circuit, so that the chopping effect on a bus voltage switch can be realized, different control modes and conduction sequences can be selected under the coordination of the MCU main control unit 1, the efficiency of the switching power supply is improved, the problem of complex magnetism is solved, reverse voltage is eliminated, the switching power supply can work more stably, the problem of discontinuous load is solved, and the overall performance of the switching power supply is improved;
the transformer unit 3 comprises a transformer T1, the transformer T1 comprises a No. 1 primary coil, a No. 2 primary coil, a No. 3 primary coil, a No. 4 secondary coil, a transformer framework and a No. 5 magnet, and the transformer unit 3 is used for energy storage and conversion of the whole switching power supply;
the main circuit unit 2 comprises capacitors C and C, resistors R, a freewheeling diodes D, chopping power MOS tubes Q, a drain electrode of the chopping power MOS tube Q is connected with a network formed by the capacitor C and the resistor R, the other ends of the capacitor C and the resistor R are connected with a cathode of the freewheeling diode D, an anode of the freewheeling diode D is connected with a drain electrode of the chopping power MOS tube Q, a source electrode of the chopping power MOS tube Q is connected with a network formed by the capacitor C and the resistor R, the other ends of the capacitor C and the resistor R are connected with a cathode of the freewheeling diode D, an anode of the freewheeling diode D is connected with one ends of the resistors R and is connected with an anode of the freewheeling diode D, a source electrode of the chopping power MOS tube Q is connected with the other end of the resistor R, the other end of the resistor R is connected with a source electrode of the chopping power MOS tube Q, a drain electrode of the chopping power MOS tube Q is connected with a No., the cathode of the freewheeling diode D3 is connected with the primary coil No. 3 of the transformer unit 3;
one end of the No. 1 primary side coil is connected with a source electrode of a chopping power MOS tube Q1, the other end of the No. 1 primary side coil is connected with a drain electrode of a chopping power MOS tube Q2, one ends of the No. 2 primary side coil and the No. 3 primary side coil are connected with Vin, one end of the No. 4 secondary side coil is connected with an anode of a diode D4 in the rectifying and filtering unit 4, and the other end of the No. 4 secondary side coil is connected with GND;
the rectifying and filtering unit 4 comprises a double-body diode D4, a D5, an inductor L1, a resistor R5 and a capacitor C3, wherein the anode of the double-body diode D4 is connected with a No. 4 secondary side coil, the cathode of the double-body diode D4 is connected with one end of the inductor L1 and is connected with Vout, one end of the capacitor C3 is connected with the ground, the other end of the capacitor C3 is connected with the Vout, the cathode of the double-body diode D5 is connected with the cathode of the double-body diode D4, the anode of the double-body diode D5 is connected with GND, and the rectifying and filtering unit 4 is used for rectifying and storing pulsating current output by the transformer, converting the current with pulsation into smooth current, and providing direct current meeting performance requirements for a load.
Example 2
The difference between this embodiment and embodiment 1 is that, in order to meet the actual requirement of control, in this embodiment, the transformer T1 adopts a multi-stage winding mode, specifically, the primary coil No. 1 is wound alone, the primary coil No. 2 and the primary coil No. 3 are wound in parallel, the diameter of the coil needs to meet the requirement of load current, and simultaneously, the insulation level and the anti-interference capability need to be ensured, so as to meet the actual requirement of control, ensure the service life and the control performance of the transformer, and well solve the current breaking problem during light load.
Referring to fig. 2, a method for operating a multi-mode forward soft-switching high-performance switching power supply circuit includes the following steps:
s1, starting a circuit and initializing a system;
s2, detecting the voltage and the current of each load and the two ends of each chopping power MOS tube through the fault detection unit 5, judging whether each load and each chopping power MOS tube are in a normal working state, if not, adjusting each load and each chopping power MOS tube and carrying out fault detection again until the loads and each chopping power MOS tube are in a normal working state;
s3, determining whether the operating mode of each chopper power MOS transistor in the main circuit unit 2 meets the operating requirement of the circuit, if not, selecting a proper control mode by adjustment, specifically, adjusting the chopper power MOS transistor Q3 when the load is small, and adjusting the chopper power MOS transistors Q1 and Q2 when the load is large, until the control mode meets the operating requirement of the circuit;
and S4, operating according to the existing operating mode.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (7)
1. A multi-mode forward soft switching high-performance switching power supply circuit is characterized by comprising an MCU (microprogrammed control Unit) main control unit (1), a main circuit unit (2), a transformer unit (3), a rectifying and filtering unit (4) and a fault detection unit (5);
the MCU main control unit (1) is connected with gate poles of chopper power MOS transistors Q1, Q2 and Q3 in the main circuit unit (2), and the MCU main control unit (1) is also connected with the fault detection unit (5);
the fault detection unit (5) is respectively connected with the source and drain of chopper power MOS transistors Q1, Q2 and Q3 in the main circuit unit (2), and the fault detection unit (5) is also connected with a resistor R5 in the rectifying and filtering unit (4);
the main circuit unit (2) is connected with the rectifying and filtering unit (4) through the transformer unit (3);
the main circuit unit (2) comprises capacitors C1 and C2, resistors R1, R2, R3 and R4, freewheeling diodes D1, D2 and D3, chopper power MOS transistors Q1, Q2 and Q3, the drain electrode of the chopping power MOS tube Q1 is connected with a network formed by a capacitor C1 and a resistor R1, meanwhile, the other ends of the capacitor C1 and the resistor R1 are connected with the cathode of a freewheeling diode D1, the anode of the freewheeling diode D1 is connected with the drain of a chopping power MOS tube Q2, the source of the chopping power MOS tube Q1 is connected with a network formed by the capacitor C2 and the resistor R2, meanwhile, the other ends of the capacitor C2 and the resistor R2 are connected with the cathode of the fly-wheel diode D2, the anode of the fly-wheel diode D2 is connected with one ends of the resistors R3 and R4, meanwhile, the chopper power MOS tube is connected with the anode of a freewheeling diode D3, the source electrode of a chopper power MOS tube Q2 is connected with the other end of a resistor R3, and the other end of the resistor R4 is connected with the source electrode of a chopper power MOS tube Q3;
the rectifying and filtering unit (4) comprises a double-body diode D4, a diode D5, an inductor L1, a resistor R5 and a capacitor C3, wherein the anode of the double-body diode D4 is connected with a No. 4 secondary side coil, the cathode of the double-body diode D4 is connected with one end of the inductor L1 and is connected with Vout, one end of the capacitor C3 is connected with the ground, the other end of the capacitor C3 is connected with the Vout, the cathode of the double-body diode D5 is connected with the cathode of the double-body diode D4, and the anode of the double-body diode D5 is connected with GND.
2. The multi-mode forward soft-switched high performance switching power supply circuit according to claim 1, characterized in that the MCU master control unit (1) comprises a master control chip circuit.
3. The multi-mode forward soft-switching high-performance switching power supply circuit according to claim 1, wherein the transformer unit (3) comprises a transformer T1, and the transformer T1 comprises a primary coil No. 1, a primary coil No. 2, a primary coil No. 3, a secondary coil No. 4, a transformer bobbin and a magnet No. 5.
4. The multi-mode forward soft-switching high-performance switching power supply circuit according to claim 3, wherein the drain of the chopper power MOS transistor Q3 is connected to the No. 2 primary winding of the transformer unit (3), and the cathode of the freewheeling diode D3 is connected to the No. 3 primary winding of the transformer unit (3).
5. The multi-mode forward soft-switching high-performance switching power supply circuit according to claim 4, wherein one end of the primary coil No. 1 is connected with the source electrode of a chopping power MOS tube Q1, the other end of the primary coil No. 1 is connected with the drain electrode of a chopping power MOS tube Q2, one ends of the primary coil No. 2 and the primary coil No. 3 are connected with Vin, one end of the secondary coil No. 4 is connected with the anode of a diode D4 in the rectifying and filtering unit (4), and the other end of the secondary coil No. 4 is connected with GND.
6. The multi-mode forward soft-switched high performance switching power supply circuit of claim 3, wherein said transformer T1 is in a multi-winding mode.
7. The multi-mode forward soft-switched high performance switching power supply circuit of claim 6, wherein the primary winding number 1 is wound alone and the primary winding number 2 and the primary winding number 3 are wound in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010216303.2A CN111262449A (en) | 2020-03-25 | 2020-03-25 | Multi-mode forward soft-switching high-performance switching power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112072925A (en) * | 2020-09-18 | 2020-12-11 | 唐山航宇电力电子设备有限公司 | Multi-mode switching power supply and control method thereof |
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