CN116317552B - DC/DC conversion topological circuit and power supply - Google Patents
DC/DC conversion topological circuit and power supply Download PDFInfo
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- CN116317552B CN116317552B CN202310090352.XA CN202310090352A CN116317552B CN 116317552 B CN116317552 B CN 116317552B CN 202310090352 A CN202310090352 A CN 202310090352A CN 116317552 B CN116317552 B CN 116317552B
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- 239000003990 capacitor Substances 0.000 claims description 84
- 238000004804 winding Methods 0.000 claims description 68
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 abstract description 13
- 230000005284 excitation Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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Classifications
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- H02M3/01—Resonant DC/DC converters
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
Abstract
The invention provides a DC/DC conversion topological circuit and a power supply, wherein the DC/DC conversion topological circuit is of a two-stage cascade topological structure and comprises a BUCK topological circuit, a first forward conversion circuit, a second forward conversion circuit and an output circuit; the first forward conversion circuit and the second forward conversion circuit are connected in parallel; the BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series; the output circuit is connected in series with the first and second forward converting circuits. The BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series, and the BUCK topology circuit is adopted in the front-stage topology, so that the influence of input change on output is reduced; the post-stage topology circuit adopts two paths of forward conversion circuits to be connected in parallel and then connected with the output circuit for output, so that stable voltage on the BUCK topology circuit can pass through the forward conversion circuit.
Description
Technical Field
The invention relates to the field of power supply control, in particular to a DC/DC conversion topological circuit and a power supply.
Background
In a general DC/DC conversion topology circuit, there are cases that the input voltage change has a large influence on the output voltage and the output efficiency is low, and the application requirements of users cannot be met.
Disclosure of Invention
In order to solve the problems, the invention provides a DC/DC conversion topological circuit and a power supply, wherein a front-stage topology is adopted, a BUCK is adopted to reduce the influence of input change on output, and an open-loop staggered forward topology is adopted at a rear stage to improve output efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a DC/DC conversion topology circuit includes a BUCK (BUCK conversion circuit) topology circuit, a first forward conversion circuit, a second forward conversion circuit and an output circuit; the first forward conversion circuit and the second forward conversion circuit are connected in parallel; the BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series; the output circuit is connected in series with the first and second forward converting circuits. The BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series, and the BUCK topology circuit is adopted in the front-stage topology, so that the influence of input change on output is reduced; the back-stage topology circuit adopts two paths of forward conversion circuits to be connected in parallel and then is connected with the output circuit for output, the back-stage topology circuit works in an open-loop mode alternately for 180 degrees, the work duty ratio is 50%, the open-loop duty ratio is not influenced by an output feedback loop, and therefore stable voltage on the BUCK topology circuit can pass through the forward conversion circuit, the electric energy transmission proportion is improved, and the output efficiency is improved.
Further, the BUCK topology circuit comprises a MOS tube Q1, a resistor R5, an inductance coil L3, a capacitor C32 and a diode D12; the drain electrode of the MOS tube Q1 is connected with an input power +VIN, the grid electrode is connected with one end of a resistor R5, and the source electrode is connected with the other end of the resistor R5, the cathode of a diode D12 and one end of an inductance coil L3; the other end of the inductance coil L3 is connected with one end of the capacitor C32 and then used as the output end of the BUCK topology circuit; the other end of the capacitor C32 is connected with one end of the resistor R1 and the anode of the diode D12; the other end of the resistor R1 is grounded to GND; and two ends of the capacitor C32 are used as output ends of the BUCK topology circuit and are connected with the first forward conversion circuit and the second forward conversion circuit in series.
Further, the DC/DC conversion topology further includes a capacitor C28; one end of the capacitor C28 is connected with the drain electrode of the MOS tube Q1, and the other end of the capacitor C is connected with the other end of the resistor R1.
Further, the first forward converting circuit comprises a transformer T1, a MOS tube Q4 and a MOS tube Q6; the transformer T1 is internally provided with a primary winding T1-A and a secondary winding T1-C; one end of the primary winding T1-A is connected with the drain electrode of the MOS tube Q4; the other end of the primary winding T1-A and the source electrode of the MOS tube Q4 are used as the input end of the first forward converting circuit and are connected with the output end of the BUCK topology circuit; one end of the secondary winding T1-C is connected with the drain electrode of the MOS tube Q6; the other end of the secondary winding T1-C and the source electrode of the MOS tube Q6 are used as the output end of the first forward converting circuit to be connected with the output circuit in series.
Further, the first forward converting circuit further comprises a capacitor C7; one end of the capacitor C7 is connected with one end of the primary winding T1-A, and the other end of the capacitor C7 is connected with the other end of the primary winding T1-A.
Further, the first forward converting circuit further comprises a resistor R7 and a resistor R13; one end of the resistor R7 is connected with the grid electrode of the MOS tube Q4, and the other end of the resistor R7 is connected with the source electrode of the MOS tube Q4; one end of the resistor R13 is connected with the grid electrode of the MOS tube Q6, and the other end of the resistor R is connected with the source electrode of the MOS tube Q6.
Further, the second forward converting circuit comprises a transformer T3, a MOS tube Q5 and a MOS tube Q7; a primary winding T3-A and a secondary winding T3-B are arranged in the transformer T3; one end of the primary winding T3-A is connected with the drain electrode of the MOS tube Q5; the other end of the primary winding T3-A and the source electrode of the MOS tube Q5 are used as the input end of the second forward conversion circuit and are connected in parallel with the input end of the first forward conversion circuit; one end of the secondary winding T3-B is connected with the drain electrode of the MOS tube Q7; the other end of the secondary winding T3-B and the source electrode of the MOS tube Q7 are used as the output end of the second forward conversion circuit and are connected in parallel with the output end of the first forward conversion circuit.
Further, the second forward converting circuit further comprises a capacitor C38; one end of the capacitor C38 is connected with one end of the primary winding T3-A, and the other end of the capacitor C is connected with the other end of the primary winding T3-A.
Further, the second forward converting circuit further comprises a resistor R8 and a resistor R14; one end of the resistor R8 is connected with the grid electrode of the MOS tube Q5, and the other end of the resistor R8 is connected with the source electrode of the MOS tube Q5; one end of the resistor R14 is connected with the grid electrode of the MOS tube Q7, and the other end of the resistor R is connected with the source electrode of the MOS tube Q7.
The first forward conversion circuit further comprises a MOS transistor Q8; a secondary winding T1-B is further arranged in the transformer T1; one end of the secondary winding T1-B is connected with the drain electrode of the MOS tube Q8 to form the other output side of the first forward converting circuit. MOS pipe Q4, MOS pipe Q6 and MOS pipe Q8 synchronous operation, work duty cycle is 50%.
The second forward conversion circuit further comprises a MOS transistor Q9; a secondary winding T3-C is further arranged in the transformer T3; one end of the secondary winding T3-C is connected with the drain electrode of the MOS tube Q9 to form the other output side of the second forward conversion circuit; the MOS tube Q5, the MOS tube Q7 and the MOS tube Q9 work synchronously, and the duty ratio of the work is 50%;
the output circuit comprises a capacitor C35 and a resistor R6, wherein one end of the capacitor C35 is connected with one end of the resistor R6 to serve as an output end +VO of the output circuit, and the other end of the capacitor C35 is connected with the other end of the resistor R6 and then grounded AGND; the two ends of the capacitor C35 are connected with the input end of the output circuit and the output ends of the first forward conversion circuit and the second forward conversion circuit; two ends of the resistor R6 are used as an output end +VO and a grounding end AGND of the output circuit;
the output circuit also comprises a capacitor C21 and a resistor R9 to form another output branch of the output circuit; one end of the capacitor C21 is connected with one end of the resistor R9, then connected with the other end of the secondary winding T3-C and the other end of the secondary winding T1-B, and grounded AGND; the other end of the capacitor C21 is connected with the other end of the resistor R9, and then is connected with the source electrode of the MOS tube Q9 and the source electrode of the MOS tube Q8 to serve as the other output end-VO.
A power supply comprising the DC/DC conversion topology described above.
The beneficial effects are that:
1. the front-stage converter is of BUCK topology, the rear-stage converter is of staggered forward resonance reset synchronous rectification topology, after the voltage input in a wide range is regulated by the BUCK converter, the voltage on the capacitor C32 is a stable output voltage, so that the input of the rear-stage converter is of a stable voltage value, and the influence of input change on the output voltage is reduced.
2. The transformer T1 and the MOS tube Q4/Q6 form a first forward converting circuit, the transformer T3 and the MOS tube Q5/Q7 form a second forward converting circuit, the first forward converting circuit and the second forward converting circuit work in an open loop mode and work alternately at 180 degrees, the MOS tube Q4/Q6 of the first forward converting circuit synchronously works, the duty ratio of the first forward converting circuit is 50%, the MOS tube Q5/Q7 of the second forward converting circuit synchronously works, the duty ratio of the second forward converting circuit is 50%, the open loop duty ratio is not influenced by an output feedback loop, and therefore stable voltage on the capacitor C32 can be transmitted to the output side of the secondary side through the transformer T1/T3 by 100%, and the output efficiency is improved.
3. The secondary side output side comprises transformer windings T1-C and T3-B, and the cross alternate working mode among the transformers improves the load cross adjustment rate of the output +VO voltage of the output circuit.
4. The capacitor C7 and the capacitor C38 are respectively resonant reset capacitors of the transformer T1 and the transformer T3, so that the magnetic fluxes of the transformer T1 and the transformer T3 can be reset, meanwhile, the capacitor C7 resonates with an excitation inductor of the transformer T1, the capacitor C38 resonates with an excitation inductor of the transformer T3, the voltage stress of primary and secondary MOS tubes of the first forward conversion circuit and the second forward conversion circuit is reduced, zero voltage on and off of the MOS tubes Q4/Q6 and Q5/Q7 are realized, and the overall efficiency of products is improved.
Drawings
FIG. 1 is a schematic diagram of an input side of a DC/DC conversion topology;
fig. 2 is a schematic diagram of the structure of the output side of a DC/DC conversion topology.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
Example 1
Fig. 1 and fig. 2 are schematic structural diagrams of a DC/DC conversion topology circuit, where the DC/DC conversion topology circuit has a two-stage cascade topology structure, and includes a BUCK topology circuit, a first forward conversion circuit, a second forward conversion circuit, and an output circuit; the first forward conversion circuit and the second forward conversion circuit are connected in parallel; the BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series; the output circuit is connected in series with the first and second forward converting circuits. The BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series, and the BUCK topology circuit is adopted in the front-stage topology, so that the influence of input change on output is reduced; the back-stage topology circuit adopts two paths of forward conversion circuits to be connected in parallel and then is connected with the output circuit for output, the back-stage topology circuit works in an open-loop mode alternately for 180 degrees, the work duty ratio is 50%, the open-loop duty ratio is not influenced by an output feedback loop, and therefore stable voltage on the BUCK topology circuit can pass through the forward conversion circuit, the electric energy transmission proportion is improved, and the output efficiency is improved.
In specific implementation, the BUCK topology circuit comprises a MOS tube Q1, a resistor R5, an inductance coil L3, a capacitor C32 and a diode D12; the drain electrode of the MOS tube Q1 is connected with an input power +VIN, the grid electrode is connected with one end of a resistor R5, and the source electrode is connected with the other end of the resistor R5, the cathode of a diode D12 and one end of an inductance coil L3; the other end of the inductance coil L3 is connected with one end of the capacitor C32 and then used as the output end of the BUCK topology circuit; the other end of the capacitor C32 is connected with one end of the resistor R1 and the anode of the diode D12; the other end of the resistor R1 is grounded to GND; and two ends of the capacitor C32 are used as output ends of the BUCK topology circuit and are connected with the first forward conversion circuit and the second forward conversion circuit in series. The front-stage converter is of a BUCK topology, after the voltage input in a wide range is regulated by the BUCK topology circuit, the voltage on the capacitor C32 is a stable output voltage, so that the input of the rear-stage forward conversion circuit is a stable voltage value, the influence of input change on the output voltage of the forward conversion circuit is reduced, and the influence of the input change on the voltage of the output circuit is reduced.
In a specific implementation, the DC/DC conversion topology circuit further includes a capacitor C28; one end of the capacitor C28 is connected with the drain electrode of the MOS tube Q1, and the other end of the capacitor C is connected with the other end of the resistor R1. The capacitor C28 is connected to the input end of the DC/DC conversion topology circuit and is used for filtering the input voltage +VIN and providing a stable input voltage for the BUCK topology circuit.
In specific implementation, the first forward converting circuit comprises a transformer T1, a MOS tube Q4 and a MOS tube Q6; the transformer T1 is internally provided with a primary winding T1-A and a secondary winding T1-C; one end of the primary winding T1-A is connected with the drain electrode of the MOS tube Q4; the other end of the primary winding T1-A and the source electrode of the MOS tube Q4 are used as the input end of the first forward converting circuit and are connected with the output end of the BUCK topology circuit; one end of the secondary winding T1-C is connected with the drain electrode of the MOS tube Q6; the other end of the secondary winding T1-C and the source electrode of the MOS tube Q6 are used as the output end of the first forward converting circuit to be connected with the output circuit in series. The MOS tube Q4 and the MOS tube Q6 work synchronously, and the duty ratio of the work is 50%.
In specific implementation, the second forward converting circuit comprises a transformer T3, a MOS tube Q5 and a MOS tube Q7; a primary winding T3-A and a secondary winding T3-B are arranged in the transformer T3; one end of the primary winding T3-A is connected with the drain electrode of the MOS tube Q5; one end of the secondary winding T3-B is connected with the drain electrode of the MOS tube Q7; the MOS tube Q5 and the MOS tube Q7 work synchronously, and the duty ratio of the work is 50%; the other end of the primary winding T3-A and the source electrode of the MOS tube Q5 are used as the input end of the second forward conversion circuit and are connected in parallel with the input end of the first forward conversion circuit; the other end of the secondary winding T3-B and the source electrode of the MOS tube Q7 are used as the output end of the second forward conversion circuit and are connected in parallel with the output end of the first forward conversion circuit. The input ends of the first forward converting circuit and the second forward converting circuit are connected in parallel, and the working duty ratio is 50%, so that the first forward converting circuit and the second forward converting circuit can work in an open loop mode and alternately 180 degrees, the open loop duty ratio is not influenced by an output feedback loop, and the stable voltage on the capacitor C32 can be transmitted to the secondary side output side through the transformer T1, the transformer T3 and 100%. The output ends of the first forward converting circuit and the second forward converting circuit are connected in parallel, the secondary side output side comprises secondary side windings T1-C and secondary side windings T3-B, the transformers work alternately in a crossing mode, and the load cross adjustment rate of the output end +VO of the output circuit is improved.
In a specific implementation, the second forward conversion circuit further includes a capacitor C38; one end of the capacitor C38 is connected with one end of the primary winding T3-A, and the other end of the capacitor C is connected with the other end of the primary winding T3-A. Likewise, the first forward converting circuit further comprises a capacitor C7; one end of the capacitor C7 is connected with one end of the primary winding T1-A, and the other end of the capacitor C7 is connected with the other end of the primary winding T1-A. The capacitor C7 is a resonance reset capacitor of the transformer T1, the capacitor C38 is a resonance reset capacitor of the transformer T3, and the capacitor C7 and the capacitor C8 can reset magnetic fluxes of the transformer T1 and the transformer T3. Meanwhile, the capacitor C7 resonates with the exciting inductance of the transformer T1, the capacitor C38 resonates with the exciting inductance of the transformer T3, voltage stress of primary and secondary side MOS tubes (namely MOS tube Q4, MOS tube Q6, MOS tube Q5 and MOS tube Q7) of the first forward converting circuit and the second forward converting circuit is reduced, zero voltage on and off of the MOS tube Q4, the MOS tube Q6, the MOS tube Q5 and the MOS tube Q7 are realized, and the overall efficiency of the product is improved.
In a specific implementation, the first forward converting circuit further comprises a resistor R7 and a resistor R13; one end of the resistor R7 is connected with the grid electrode of the MOS tube Q4, and the other end of the resistor R7 is connected with the source electrode of the MOS tube Q4; one end of the resistor R13 is connected with the grid electrode of the MOS tube Q6, and the other end of the resistor R is connected with the source electrode of the MOS tube Q6. The second forward conversion circuit further comprises a resistor R8 and a resistor R14; one end of the resistor R8 is connected with the grid electrode of the MOS tube Q5, and the other end of the resistor R8 is connected with the source electrode of the MOS tube Q5; one end of the resistor R14 is connected with the grid electrode of the MOS tube Q7, and the other end of the resistor R is connected with the source electrode of the MOS tube Q7. The resistors R7 and R13, and the resistors R8 and R14 are for discharging static electricity.
In a specific implementation, the output circuit comprises a capacitor C35 and a resistor R6, wherein one end of the capacitor C35 is connected with one end of the resistor R6 to serve as an output end +vo of the output circuit, and the other end of the capacitor C35 is connected with the other end of the resistor R6 and then grounded AGND; one end of the capacitor C35 is connected with the input end of the output circuit and the output ends of the first forward conversion circuit and the second forward conversion circuit; the two ends of the resistor R6 are used as an output end +VO and a grounding end AGND of the output circuit. The capacitor C35 forms a filter circuit of the output circuit, so that the output voltage is more stable, the resistor R6 is a dummy load of the output circuit, and a better load adjustment degree design is realized.
Example two
The first forward conversion circuit further includes a MOS transistor Q8; a secondary winding T1-B is further arranged in the transformer T1; one end of the secondary winding T1-B is connected with the drain electrode of the MOS tube Q8 to form the other output side of the first forward converting circuit. MOS pipe Q4, MOS pipe Q6 and MOS pipe Q8 synchronous operation, work duty cycle is 50%.
In specific implementation, the second forward conversion circuit further comprises a MOS tube Q9; a secondary winding T3-C is further arranged in the transformer T3; one end of the secondary winding T3-C is connected with the drain electrode of the MOS tube Q9 to form the other output side of the second forward conversion circuit; MOS pipe Q5, MOS pipe Q7 and MOS pipe Q9 synchronous operation, work duty cycle is 50%.
The output circuit also comprises a capacitor C21 and a resistor R9 to form another output branch of the output circuit; one end of the capacitor C21 is connected with one end of the resistor R9, then connected with the other end of the secondary winding T3-C and the other end of the secondary winding T1-B, and grounded AGND; the other end of the capacitor C21 is connected with the other end of the resistor R9, and then is connected with the source electrode of the MOS tube Q7 and the source electrode of the MOS tube Q8 to serve as the other output end-VO.
The MOS tube Q4, the MOS tube Q6 and the MOS tube Q8 of the first forward converting circuit synchronously work, the duty ratio of work is 50%, the MOS tube Q5, the MOS tube Q7 and the MOS tube Q9 of the second forward converting circuit synchronously work, the duty ratio of work is 50%, the open loop duty ratio is not influenced by an output feedback loop, stable voltage on the capacitor C32 can be transmitted to the secondary side output side through a transformer T1 and a transformer T3 by 100%, the secondary side output end-VO comprises secondary side windings T1-B and secondary side windings T3-C, the transformers work alternately in a crossing mode, the load cross adjustment rate of output end-VO voltage is improved, and multipath output with the load cross adjustment rate improved can be formed. Meanwhile, the MOS tube Q6 and the MOS tube Q8, the MOS tube Q7 and the MOS tube Q9 adopt a synchronous rectification mode, so that the voltage drop of a rectification part is reduced, the influence of the change of an output load on the +VO/-VO voltage of an output end is reduced, meanwhile, the product efficiency is improved, and the coupling degree between multiple paths of output is improved.
In specific implementation, the first forward converting circuit further includes a resistor R15, one end of the resistor R15 is connected to the gate of the MOS transistor Q8, and the other end is connected to the source of the MOS transistor Q8. The second forward converting circuit further comprises a resistor R16, one end of the resistor R16 is connected with the grid electrode of the MOS tube Q9, and the other end of the resistor R16 is connected with the source electrode of the MOS tube Q9.
The embodiment aims at a positive-negative output product with low-voltage and wide-range input (generally 16V-70V), and is invented for reducing the influence of input voltage on the stability of output voltage, improving the overall efficiency of the product and improving the cross adjustment rate of a multi-output load. Under the condition of low-voltage wide-range input, a BUCK topology circuit is adopted in the front-stage topology in order to reduce the influence of input change on output. In order to improve the coupling degree between the multipath outputs, the back-stage topology adopts an open-loop staggered forward topology circuit formed by a first forward conversion circuit and a second forward conversion circuit. In order to reduce the influence of voltage drop of the output rectifying part on the output voltage, each MOS tube at the output side adopts a synchronous rectifying mode. The resonance capacitor C7 and the capacitor C8 are used for resetting the magnetic flux of the open-loop staggered forward topology circuit, and simultaneously, the open-loop staggered forward topology excitation inductance Lm and the resonance reset capacitor are made to resonate, so that the primary and secondary MOS transistors of the open-loop staggered forward topology are switched on and off to work in a ZVS mode, the primary and secondary MOS transistors VDS are half sine waveforms, the voltage stress of the switching transistors is reduced, and the overall efficiency of the product is improved.
Example III
A power supply comprising the DC/DC conversion topology described above.
The beneficial effects are that:
1. the front-stage converter is of BUCK topology, the rear-stage converter is of staggered forward resonance reset synchronous rectification topology, after the voltage input in a wide range is regulated by the BUCK converter, the voltage on the capacitor C32 is a stable output voltage, so that the input of the rear-stage converter is of a stable voltage value, and the influence of input change on the output voltage is reduced.
2. The transformer T1 and the MOS tube Q4/Q6 form a first forward converting circuit, the transformer T3 and the MOS tube Q5/Q7 form a second forward converting circuit, the first forward converting circuit and the second forward converting circuit work in an open loop mode and work alternately at 180 degrees, the MOS tube Q4/Q6 of the first forward converting circuit synchronously works, the duty ratio of the first forward converting circuit is 50%, the MOS tube Q5/Q7 of the second forward converting circuit synchronously works, the duty ratio of the second forward converting circuit is 50%, the open loop duty ratio is not influenced by an output feedback loop, and therefore stable voltage on the capacitor C32 can be transmitted to the output side of the secondary side through the transformer T1/T3 by 100%, and the output efficiency is improved.
3. The secondary side output side comprises transformer windings T1-C and T3-B, and the cross alternate working mode among the transformers improves the load cross adjustment rate of the output +VO voltage of the output circuit.
4. The capacitor C7 and the capacitor C38 are respectively resonant reset capacitors of the transformer T1 and the transformer T3, so that the magnetic fluxes of the transformer T1 and the transformer T3 can be reset, meanwhile, the capacitor C7 resonates with an excitation inductor of the transformer T1, the capacitor C38 resonates with an excitation inductor of the transformer T3, the voltage stress of primary and secondary MOS tubes of the first forward conversion circuit and the second forward conversion circuit is reduced, zero voltage on and off of the MOS tubes Q4/Q6 and Q5/Q7 are realized, and the overall efficiency of products is improved.
And 5. The MOS tube Q6 and the MOS tube Q8, and the MOS tube Q7 and the MOS tube Q9 adopt a synchronous rectification mode, so that the voltage drop of a rectification part is reduced, the influence of the change of an output load on the +VO/-VO voltage of an output end is reduced, the product efficiency is improved, and the coupling degree between multiple paths of output is improved.
The invention provides a DC/DC conversion topological circuit and a power supply, wherein the DC/DC conversion topological circuit is of a two-stage cascade topological structure and comprises a BUCK topological circuit, a first forward conversion circuit, a second forward conversion circuit and an output circuit; the first forward conversion circuit and the second forward conversion circuit are connected in parallel; the BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series; the output circuit is connected in series with the first and second forward converting circuits. The BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series, and the BUCK topology circuit is adopted in the front-stage topology, so that the influence of input change on output is reduced; the back-stage topology circuit adopts two paths of forward conversion circuits to be connected in parallel and then is connected with the output circuit for output, the back-stage topology circuit works in an open-loop mode alternately for 180 degrees, the work duty ratio is 50%, the open-loop duty ratio is not influenced by an output feedback loop, and therefore stable voltage on the BUCK topology circuit can pass through the forward conversion circuit, the electric energy transmission proportion is improved, and the output efficiency is improved.
In the description of the present invention, it should be understood that the terms "middle," "length," "upper," "lower," "front," "rear," "vertical," "horizontal," "inner," "outer," "radial," "circumferential," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "on" a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. The meaning of "a plurality of" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The above description is for the purpose of illustrating the embodiments of the present invention and is not to be construed as limiting the invention, but is intended to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The DC/DC conversion topological circuit is characterized by comprising a BUCK topological circuit, a first forward conversion circuit, a second forward conversion circuit and an output circuit; the first forward conversion circuit and the second forward conversion circuit are connected in parallel; the BUCK topology circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series; the output circuit is connected with the first forward conversion circuit and the second forward conversion circuit in series;
the first forward converting circuit comprises a transformer T1, an MOS tube Q4 and an MOS tube Q6; the transformer T1 is internally provided with a primary winding T1-A and a secondary winding T1-C; one end of the primary winding T1-A is connected with the drain electrode of the MOS tube Q4; the other end of the primary winding T1-A and the source electrode of the MOS tube Q4 are used as the input end of the first forward converting circuit and are connected with the output end of the BUCK topology circuit; one end of the secondary winding T1-C is connected with the drain electrode of the MOS tube Q6; the other end of the secondary winding T1-C and the source electrode of the MOS tube Q6 are used as the output end of the first forward converting circuit;
the second forward converting circuit comprises a transformer T3, an MOS tube Q5 and an MOS tube Q7; a primary winding T3-A and a secondary winding T3-B are arranged in the transformer T3; one end of the primary winding T3-A is connected with the drain electrode of the MOS tube Q5; the other end of the primary winding T3-A and the source electrode of the MOS tube Q5 are used as the input end of the second forward conversion circuit and are connected in parallel with the input end of the first forward conversion circuit; one end of the secondary winding T3-B is connected with the drain electrode of the MOS tube Q7; the other end of the secondary winding T3-B and the source electrode of the MOS tube Q7 are used as the output end of the second forward converting circuit;
the output circuit comprises a capacitor C35 and a resistor R6, wherein one end of the capacitor C35 is connected with one end of the resistor R6 to serve as an output end +VO of the output circuit, and the other end of the capacitor C35 is connected with the other end of the resistor R6 and then grounded AGND; the two ends of the capacitor C35 are connected with the input end of the output circuit and the output ends of the first forward conversion circuit and the second forward conversion circuit; two ends of the resistor R6 are used as an output end +VO and a grounding end AGND of the output circuit;
the first forward conversion circuit further comprises a MOS transistor Q8; a secondary winding T1-B is further arranged in the transformer T1; one end of the secondary winding T1-B is connected with the drain electrode of the MOS tube Q8; the second forward conversion circuit further comprises a MOS transistor Q9; a secondary winding T3-C is further arranged in the transformer T3; one end of the secondary winding T3-C is connected with the drain electrode of the MOS tube Q9;
the output circuit also comprises a capacitor C21 and a resistor R9 to form another output branch of the output circuit; one end of the capacitor C21 is connected with one end of the resistor R9, then connected with the other end of the secondary winding T3-C and the other end of the secondary winding T1-B, and grounded AGND; the other end of the capacitor C21 is connected with the other end of the resistor R9, and then is connected with the source electrode of the MOS tube Q9 and the source electrode of the MOS tube Q8 to serve as the other output end-VO;
the MOS tube Q4, the MOS tube Q6 and the MOS tube Q8 work synchronously, and the duty ratio of the work is 50%;
MOS pipe Q5, MOS pipe Q7 and MOS pipe Q9 synchronous operation, work duty cycle is 50%.
2. The DC/DC conversion topology according to claim 1, wherein the BUCK topology comprises a MOS transistor Q1, a resistor R5, an inductor L3, a capacitor C32, and a diode D12; the drain electrode of the MOS tube Q1 is connected with an input power +VIN, the grid electrode is connected with one end of a resistor R5, and the source electrode is connected with the other end of the resistor R5, the cathode of a diode D12 and one end of an inductance coil L3; the other end of the inductance coil L3 is connected with one end of the capacitor C32 and then used as the output end of the BUCK topology circuit; the other end of the capacitor C32 is connected with one end of the resistor R1 and the anode of the diode D12; the other end of the resistor R1 is grounded to GND; and two ends of the capacitor C32 are used as output ends of the BUCK topology circuit and are connected with the first forward conversion circuit and the second forward conversion circuit in series.
3. The DC/DC conversion topology of claim 2, further comprising a capacitor C28; one end of the capacitor C28 is connected with the drain electrode of the MOS tube Q1, and the other end of the capacitor C is connected with the other end of the resistor R1.
4. The DC/DC conversion topology of claim 1, wherein said first forward converter circuit further comprises a resistor R7; one end of the resistor R7 is connected with the grid electrode of the MOS tube Q4, and the other end of the resistor R7 is connected with the source electrode of the MOS tube Q4.
5. The DC/DC conversion topology of claim 1, wherein said first forward converter circuit further comprises a resistor R13; one end of the resistor R13 is connected with the grid electrode of the MOS tube Q6, and the other end of the resistor R is connected with the source electrode of the MOS tube Q6.
6. The DC/DC conversion topology of claim 1, wherein said second forward converter circuit further comprises a resistor R8; one end of the resistor R8 is connected with the grid electrode of the MOS tube Q5, and the other end of the resistor R8 is connected with the source electrode of the MOS tube Q5.
7. The DC/DC conversion topology of claim 1, wherein said second forward converter circuit further comprises a resistor R14; one end of the resistor R14 is connected with the grid electrode of the MOS tube Q7, and the other end of the resistor R is connected with the source electrode of the MOS tube Q7.
8. A power supply comprising the DC/DC conversion topology according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788634A (en) * | 1987-06-22 | 1988-11-29 | Massachusetts Institute Of Technology | Resonant forward converter |
| CN1389971A (en) * | 2002-07-16 | 2003-01-08 | 艾默生网络能源有限公司 | Dc-to-DC converter with several outputs and its conversion method |
| CN101197540A (en) * | 2007-12-11 | 2008-06-11 | 艾默生网络能源有限公司 | Dc converter |
| CN107346940A (en) * | 2016-05-05 | 2017-11-14 | 中车株洲电力机车研究所有限公司 | A kind of power conversion circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7196914B2 (en) * | 2004-11-19 | 2007-03-27 | Virginia Tech Intellectual Properties, Inc. | Power converters having capacitor resonant with transformer leakage inductance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788634A (en) * | 1987-06-22 | 1988-11-29 | Massachusetts Institute Of Technology | Resonant forward converter |
| CN1389971A (en) * | 2002-07-16 | 2003-01-08 | 艾默生网络能源有限公司 | Dc-to-DC converter with several outputs and its conversion method |
| CN101197540A (en) * | 2007-12-11 | 2008-06-11 | 艾默生网络能源有限公司 | Dc converter |
| CN107346940A (en) * | 2016-05-05 | 2017-11-14 | 中车株洲电力机车研究所有限公司 | A kind of power conversion circuit |
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