CN111245250A - High-performance flyback switching power supply circuit and working method thereof - Google Patents
High-performance flyback switching power supply circuit and working method thereof Download PDFInfo
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- CN111245250A CN111245250A CN202010217446.5A CN202010217446A CN111245250A CN 111245250 A CN111245250 A CN 111245250A CN 202010217446 A CN202010217446 A CN 202010217446A CN 111245250 A CN111245250 A CN 111245250A
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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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of power supply circuits, in particular to a high-performance flyback switching power supply circuit which comprises a performance control module, a power redundancy module, a protection module and a transformer, wherein the performance control module is connected with the power redundancy module, the power redundancy module is connected with the transformer module, the performance control module is also connected with the protection module, and the protection module is simultaneously connected with the transformer module. The invention can stably output current under the condition of sudden load change, so that the power supply outputs smoothly, meanwhile, the programmable chip is adopted as the control chip, thereby being beneficial to self regulation of the power supply, having very high protection measures, increasing redundant design, and improving safety, reliability and load carrying capacity.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a high-performance flyback switching power supply circuit and a working method thereof.
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. Because the flyback switching power supply provides energy output to the load only during the period of controlling the switch to be turned off, the transient control characteristic of the output voltage of the flyback switching power supply is relatively poor, the performance is low, and the reliability is poor.
However, in the existing design of the flyback switching power supply, a single power switching tube is generally used as a chopping switch of a primary coil, the transient control characteristic is poor, relative self-regulation cannot be performed due to control of a special chip, the current output capability of a next-stage load cannot be stably realized, the protection measures are incomplete, redundant measures are almost not available, and the safety and the reliability are low.
Therefore, in view of the above situation, there is an urgent need to develop a high-performance flyback switching power supply circuit to overcome the shortcomings in the current practical application.
Disclosure of Invention
The present invention is directed to a flyback switching power supply circuit with high performance, so as to solve the problems mentioned in the above background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-performance flyback switching power supply circuit comprises a performance control module, a power redundancy module, a protection module and a transformer, wherein the performance control module is connected with the power redundancy module, the power redundancy module is connected with the transformer module, the performance control module is also connected with the protection module, and the protection module is simultaneously connected with the transformer module;
the power redundancy module comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a freewheeling diode D1, a freewheeling diode D2, a chopping power MOS transistor Q1 and a chopping power MOS transistor Q2, wherein the cathode of the freewheeling diode D1 is connected with one end of a capacitor C1 and one end of a resistor R1, the capacitor C1 and the resistor R1 are connected in parallel, the anode of the freewheeling diode D1 is connected with the drain of the chopping MOS transistor Q1, the cathode of the freewheeling diode D2 is connected with one end of a capacitor C2 and one end of a resistor R2, the capacitor C2 and the resistor R2 are connected in parallel, and the anode of the freewheeling diode D2 is connected with the drain of the chopping MOS transistor Q2;
the transformer module comprises a transformer, and the transformer consists of a first primary coil, a second primary coil, a secondary coil and a magnet arranged between the second primary coil and the secondary coil.
As a further scheme of the invention: and the sources of the chopping MOS tube Q1 and the chopping MOS tube Q2 are both grounded.
As a further scheme of the invention: the first primary coil and the second primary coil are wound in parallel, and the secondary coil is wound in the middle of the first primary coil and the second primary coil.
As a further scheme of the invention: the other ends of the capacitor C1, the capacitor C2, the resistor R1 and the resistor R2 are connected with the first primary coil and the second primary coil of the transformer.
As a further scheme of the invention: anodes of the freewheeling diode D1 and the freewheeling diode D2 are connected to the first primary winding and the second primary winding, respectively.
As a further scheme of the invention: the performance control module is connected with gates of a chopping MOS tube Q1 and a chopping MOS tube Q2; the performance control module is also connected with the protection module, and the protection module is connected with a secondary coil in the transformer module.
As a further scheme of the invention: the transformer module further comprises a rectifying module, the rectifying module consists of a rectifying diode D3 and an energy storage capacitor C3, the rectifying diode D3 is a diode packaged in a two-body parallel mode, the anode of the rectifying diode D3 is connected with a secondary side coil in the transformer module, the cathode of the rectifying diode D3 is connected with the energy storage capacitor C3 and connected with Vout, and the other end of the energy storage capacitor C3 is grounded.
The working method of the high-performance flyback switching power supply circuit is characterized by comprising the following steps of:
s1, before the performance control module is powered on, initializing each variable;
s2, detecting voltage, current, frequency and other data of the transformer side and the load side according to the data output by the protection module;
and S3, if the detection result of the step S2 accords with the design parameter index of the power supply, continuing to work according to the current working mode, and if the detection result is abnormal, performing corresponding PWM control according to the detected abnormal variable.
As a further scheme of the invention: in step S3, the PWM control includes changing the switching time, switching frequency, and switching sequence of the chopper power MOS transistor Q1 and chopper power MOS transistor Q2.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can stably output current under the condition of sudden load change, so that the power supply outputs smoothly, and meanwhile, the programmable chip is adopted as the control chip, thereby being beneficial to self regulation of the power supply, having very high protection measures, increasing redundant design, improving safety, reliability and load carrying capacity;
(2) according to the invention, different modes can be selected to control the on and off of the MOS transistor according to different working conditions, so that the stability of the output voltage of the whole power circuit is improved;
(3) the power redundancy module is adopted, so that the electrical redundancy design is realized, one path of the power redundancy module is effectively prevented from being damaged and incapable of working, and the protection capability of the switching power supply is improved;
(4) the invention adopts a novel transformer winding technology, improves the stability of each path of output voltage of the switch power supply, and changes the performance problem caused by sudden change of load;
(5) the protection module is added, so that the voltage, the current and the frequency of the output end and the load end of the transformer are measured, the high-performance work of an MOS (metal oxide semiconductor) tube and the transformer is facilitated, and the controllability and the reliability of the switching power supply are improved;
(6) 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 high-performance flyback switching power supply circuit.
Fig. 2 is a flowchart of the operation of the high-performance flyback switching power supply circuit.
In the figure: 1-performance control module, 2-power redundancy module, 3-protection module, 4-rectification module, 5-transformer module, 51-first primary coil, 52-second primary coil, 53-secondary coil and 54-magnet.
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 high-performance flyback switching power supply circuit includes a performance control module 1, a power redundancy module 2, a protection module 3, and a transformer 5, where the performance control module 1 is connected to the power redundancy module 2, the power redundancy module 2 is connected to the transformer module 5, the performance control module 1 is further connected to the protection module 3, and the protection module 3 is also connected to the transformer module 5;
the power redundancy module 2 comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a freewheeling diode D1, a freewheeling diode D2, a chopping power MOS transistor Q1 and a chopping power MOS transistor Q2, wherein the cathode of the freewheeling diode D1 is connected with one end of a capacitor C1 and one end of a resistor R1, the capacitor C1 and the resistor R1 are connected in parallel, the anode of the freewheeling diode D1 is connected with the drain of the chopping MOS transistor Q1, the cathode of the freewheeling diode D2 is connected with one end of a capacitor C2 and one end of a resistor R2, the capacitor C2 and the resistor R2 are connected in parallel, the anode of the freewheeling diode D2 is connected with the drain of the chopping MOS transistor Q2, the sources of the chopping MOS transistor Q1 and the chopping MOS transistor Q2 are both grounded, and the power redundancy module 2 serves as a transformer switching circuit and can play a role of backup, and can effectively improve transient performance under the cooperation of the performance control module 1;
the transformer module 5 comprises a transformer, and the transformer consists of a first primary coil 51, a second primary coil 52, a secondary coil 53 and a magnet 54 arranged between the second primary coil 52 and the secondary coil 53;
the transformer module 5 is used for transmitting and storing energy of the whole switching power supply, and ensures that corresponding energy is provided for subsequent loads, the transformer module 5 changes the previous winding mode, two strands of the first primary coil 51 and the second primary coil 52 are wound in parallel, when the winding is completed by one turn, the first primary coil 51 and the second primary coil 52 are continuously wound in the left-right direction exchange direction, and so on, and meanwhile, the secondary coil 53 is ensured to be wound at the middle position of the first primary coil 51 and the second primary coil 52;
in order to ensure that the diameter of the coil needs to meet the requirement of load current and ensure the insulation grade and the anti-interference capability, the transformer in the transformer module 5 should be designed and selected according to the specification;
the other ends of the capacitor C1, the capacitor C2, the resistor R1 and the resistor R2 are connected with a first primary coil 51 and a second primary coil 52 of the transformer, and the anodes of the fly-wheel diode D1 and the fly-wheel diode D2 are respectively connected with the first primary coil 51 and the second primary coil 52;
the performance control module 1 adopts a programmable chip as a control chip, the performance control module 1 is connected with gate poles of a chopping MOS tube Q1 and a chopping MOS tube Q2 and is used for follow current of primary side current of the transformer, simultaneously chopping bus voltage, controlling voltage input of the primary side and carrying out redundancy design on a switch MOS tube and a follow current device, so that when one group of chopping switches is damaged, the other chopping switch continues to work, and meanwhile, two groups of chopping MOS work cooperatively, so that the output performance is ensured; the performance control module 1 is further connected with the protection module 3, the protection module 3 is connected with the secondary coil 53 in the transformer module 5, the protection module 3 is used for detecting load change and output current and voltage of a transformer, the protection module 3 ensures transient performance of a power supply, and safety and reliability of the switching power supply are ensured.
Example 2
Referring to fig. 1, in an embodiment of the present invention, a high-performance flyback switching power supply circuit includes a performance control module 1, a power redundancy module 2, a protection module 3, and a transformer 5, where the performance control module 1 is connected to the power redundancy module 2, the power redundancy module 2 is connected to the transformer module 5, the performance control module 1 is further connected to the protection module 3, and the protection module 3 is also connected to the transformer module 5;
the power redundancy module 2 comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a freewheeling diode D1, a freewheeling diode D2, a chopping power MOS transistor Q1 and a chopping power MOS transistor Q2, wherein the cathode of the freewheeling diode D1 is connected with one end of a capacitor C1 and one end of a resistor R1, the capacitor C1 and the resistor R1 are connected in parallel, the anode of the freewheeling diode D1 is connected with the drain of the chopping MOS transistor Q1, the cathode of the freewheeling diode D2 is connected with one end of a capacitor C2 and one end of a resistor R2, the capacitor C2 and the resistor R2 are connected in parallel, the anode of the freewheeling diode D2 is connected with the drain of the chopping MOS transistor Q2, the sources of the chopping MOS transistor Q1 and the chopping MOS transistor Q2 are both grounded, and the power redundancy module 2 serves as a transformer switching circuit and can play a role of backup, and can effectively improve transient performance under the cooperation of the performance control module 1;
the transformer module 5 comprises a transformer, and the transformer consists of a first primary coil 51, a second primary coil 52, a secondary coil 53 and a magnet 54 arranged between the second primary coil 52 and the secondary coil 53;
the transformer module 5 is used for transmitting and storing energy of the whole switching power supply, and ensures that corresponding energy is provided for subsequent loads, the transformer module 5 changes the previous winding mode, two strands of the first primary coil 51 and the second primary coil 52 are wound in parallel, when the winding is completed by one turn, the first primary coil 51 and the second primary coil 52 are continuously wound in the left-right direction exchange direction, and so on, and meanwhile, the secondary coil 53 is ensured to be wound at the middle position of the first primary coil 51 and the second primary coil 52;
in order to ensure that the diameter of the coil needs to meet the requirement of load current and ensure the insulation grade and the anti-interference capability, the transformer in the transformer module 5 should be designed and selected according to the specification;
the other ends of the capacitor C1, the capacitor C2, the resistor R1 and the resistor R2 are connected with a first primary coil 51 and a second primary coil 52 of the transformer, and the anodes of the fly-wheel diode D1 and the fly-wheel diode D2 are respectively connected with the first primary coil 51 and the second primary coil 52;
the performance control module 1 adopts a programmable chip as a control chip, the performance control module 1 is connected with gate poles of a chopping MOS tube Q1 and a chopping MOS tube Q2 and is used for follow current of primary side current of the transformer, simultaneously chopping bus voltage, controlling voltage input of the primary side and carrying out redundancy design on a switch MOS tube and a follow current device, so that when one group of chopping switches is damaged, the other chopping switch continues to work, and meanwhile, two groups of chopping MOS work cooperatively, so that the output performance is ensured; the performance control module 1 is further connected with the protection module 3, the protection module 3 is connected with the secondary coil 53 in the transformer module 5, the protection module 3 is used for detecting load change and output current and voltage of a transformer, the protection module 3 ensures transient performance of a power supply, and safety and reliability of the switching power supply are ensured.
The difference between this embodiment and embodiment 1 is that the dc-dc converter further includes a rectifier module 4, where the rectifier module 4 is composed of a rectifier diode D3 and an energy storage capacitor C3, the rectifier diode D3 is a diode packaged in parallel with two bodies, an anode of the rectifier diode D3 is connected to the secondary coil 53 in the transformer module 5, a cathode of the rectifier diode D3 is connected to the energy storage capacitor C3 and Vout, and the other end of the energy storage capacitor C3 is grounded, and the rectifier module 4 rectifies and stores pulsating current output by the transformer, converts the pulsating current into smooth direct current meeting performance requirements, and provides the smooth direct current to a load.
Referring to fig. 2, a working method of a high-performance flyback switching power supply circuit includes the following steps:
s1, before the performance control module 1 is powered on, each variable is initialized
S2, detecting data such as voltage, current, and frequency on the transformer side and the load side based on the data output from the protection module 3;
s3, if the detection result of the step S2 accords with the design parameter index of the power supply, continuing to work according to the current working mode, if the detection result is abnormal, carrying out corresponding PWM control according to the detected abnormal variable;
specifically, in this embodiment, the PWM control includes changing the switching time, the switching frequency, and the switching sequence of the chopping power MOS transistor Q1 and the chopping power MOS transistor Q2, so as to meet the requirement of the design index, and to enable the output voltage and current to be output smoothly without dropping.
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 (9)
1. A high-performance flyback switching power supply circuit is characterized by comprising a performance control module (1), a power redundancy module (2), a protection module (3) and a transformer (5), wherein the performance control module (1) is connected with the power redundancy module (2), the power redundancy module (2) is connected with the transformer module (5), the performance control module (1) is also connected with the protection module (3), and the protection module (3) is simultaneously connected with the transformer module (5);
the power redundancy module (2) comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a freewheeling diode D1, a freewheeling diode D2, a chopping power MOS Q1 and a chopping power MOS Q2, wherein the cathode of the freewheeling diode D1 is connected with one end of a capacitor C1 and one end of a resistor R1, the capacitor C1 and the resistor R1 are connected in parallel, the anode of the freewheeling diode D1 is connected with the drain of the chopping power MOS Q1, the cathode of the freewheeling diode D2 is connected with one end of a capacitor C2 and one end of a resistor R2, the capacitor C2 and the resistor R2 are connected in parallel, and the anode of the freewheeling diode D2 is connected with the drain of the chopping power MOS Q2;
the transformer module (5) comprises a transformer, and the transformer consists of a first primary coil (51), a second primary coil (52), a secondary coil (53) and a magnet (54) arranged between the second primary coil (52) and the secondary coil (53).
2. The high-performance flyback switching power supply circuit according to claim 1, wherein the sources of the chopping MOS transistor Q1 and the chopping MOS transistor Q2 are both grounded.
3. The high performance flyback switching power supply circuit according to claim 1, wherein the first primary coil (51) and the second primary coil (52) are wound in parallel two times, and the secondary coil (53) is wound at a position intermediate the first primary coil (51) and the second primary coil (52).
4. The high performance flyback switching power supply circuit according to claim 3, wherein the other ends of the capacitor C1, the capacitor C2, the resistor R1 and the resistor R2 are connected to the first primary coil (51) and the second primary coil (52) of the transformer.
5. The high-performance flyback switching power supply circuit according to claim 4, wherein anodes of the freewheeling diode D1 and the freewheeling diode D2 are connected to the first primary coil (51) and the second primary coil (52), respectively.
6. The flyback switching power supply circuit of claim 5, wherein the performance control module (1) is connected to the gates of the chopper MOS transistor Q1 and chopper MOS transistor Q2; the performance control module (1) is also connected with the protection module (3), and the protection module (3) is connected with a secondary coil (53) in the transformer module (5).
7. The high-performance flyback switching power supply circuit according to claim 1, further comprising a rectifying module (4), wherein the rectifying module (4) is composed of a rectifying diode D3 and an energy-storage capacitor C3, the rectifying diode D3 is a diode packaged in parallel with two bodies, an anode of the rectifying diode D3 is connected to the secondary winding (53) in the transformer module (5), a cathode of the rectifying diode D3 is connected to the energy-storage capacitor C3 and Vout, and the other end of the energy-storage capacitor C3 is grounded.
8. The method of operating a high performance flyback switching power supply circuit as claimed in any of claims 1 to 7, comprising the steps of:
s1, before the performance control module (1) is powered on, initializing each variable;
s2, detecting voltage, current, frequency and other data of the transformer side and the load side according to the data output by the protection module (3);
and S3, if the detection result of the step S2 accords with the design parameter index of the power supply, continuing to work according to the current working mode, and if the detection result is abnormal, performing corresponding PWM control according to the detected abnormal variable.
9. The operating method of the flyback switching power supply circuit as claimed in claim 8, wherein in step S3, the PWM control includes changing the switching time, the switching frequency and the switching sequence of the chopping power MOS transistor Q1 and the chopping power MOS transistor Q2.
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| CN202010217446.5A CN111245250A (en) | 2020-03-25 | 2020-03-25 | High-performance flyback switching power supply circuit and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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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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