CN115622418A - Multi-output switching power supply - Google Patents
Multi-output switching power supply Download PDFInfo
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- CN115622418A CN115622418A CN202211609135.9A CN202211609135A CN115622418A CN 115622418 A CN115622418 A CN 115622418A CN 202211609135 A CN202211609135 A CN 202211609135A CN 115622418 A CN115622418 A CN 115622418A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/064—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode with several outputs
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/1552—Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor
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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
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of switching power supplies, and particularly discloses a multi-output switching power supply, which comprises: the power supply comprises an input rectification filter circuit, a power supply management chip, a multi-winding inductance unit, a feedback circuit, a follow current circuit and an output rectification filter circuit; the power management chip can adaptively adjust the duty ratio of the switch so as to convert the input voltage after rectification and filtering and obtain the output voltage of the main circuit through the feedback adjustment of the feedback circuit; the multi-winding inductance unit can be inductively coupled and superposed with the main circuit output voltage to obtain an alternating voltage; the output rectifying and filtering circuit is used for rectifying and filtering the alternating voltage to obtain an Nth auxiliary circuit output voltage, wherein N is an integer greater than or equal to 1, and each auxiliary circuit output voltage corresponds to one output rectifying and filtering circuit; the freewheel circuit is used for forming a freewheel path between the multi-winding inductive element and the main circuit output voltage. The multi-output switching power supply provided by the invention has low cost and high precision of the auxiliary circuit output voltage.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a multi-output switching power supply.
Background
Buck or Buck-Boost circuit is widely used in the fields of household appliances, industry and the like, and because the inside of a product has various loads or control circuits, a plurality of power supplies with different output voltages are needed. Generally, when a Buck or Buck-Boost power supply is used for multi-path output, a single inductor mode is adopted to output one main power supply, and then the multi-path output is realized by voltage reduction of a linear voltage stabilizer. If each auxiliary power supply needs to be added with a linear voltage stabilizer, the cost is not economical, and the loading capacity and the efficiency index are poor.
In order to improve the efficiency index, in the prior art, a Buck or Buck-Boost power supply is used for directly outputting multiple paths of power supplies, but the voltage precision of auxiliary power supplies except a main power supply is poor, and if the precision is improved, the problems of high cost, and poor carrying capacity and efficiency index of the voltage stabilizer are also faced.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a power circuit with low cost and high output voltage precision.
Disclosure of Invention
The invention provides a multi-output switching power supply, which solves the problems of high cost and low precision of auxiliary circuit output voltage of a multi-output power supply circuit in the prior art.
As an aspect of the present invention, there is provided a multiple output switching power supply, including: the power supply comprises an input rectification filter circuit, a power supply management chip, a multi-winding inductance unit, a feedback circuit, a follow current circuit and an output rectification filter circuit, wherein the input rectification filter circuit, the multi-winding inductance unit, the feedback circuit and the follow current circuit are all connected with the power supply management chip, and the output rectification filter circuit is connected with the multi-winding inductance unit;
the input rectification filter circuit is used for carrying out rectification filter processing on the input voltage;
the power management chip can adaptively adjust the duty ratio of a switch so as to convert the input voltage after rectification and filtering processing and obtain the output voltage of the main circuit through the feedback adjustment of the feedback circuit;
the multi-winding inductive unit can be inductively coupled and superposed with the main circuit output voltage to obtain an alternating voltage;
the output rectifying and filtering circuit is used for rectifying and filtering the alternating voltage to obtain an Nth auxiliary circuit output voltage, wherein N is an integer greater than or equal to 1, and each auxiliary circuit output voltage corresponds to one output rectifying and filtering circuit;
the freewheeling circuit is used to form a freewheeling path between the multi-winding inductive unit and the main circuit output voltage.
Further, the multi-winding inductance unit comprises a main inductance and N auxiliary inductances wound on the same magnetic element,
said main inductor is for supplying said main output voltage in said freewheel path,
each auxiliary inductor is coupled with the main inductor to realize mutual inductance coupling superposition with the main circuit output voltage to obtain an alternating voltage.
Furthermore, one end of the main inductor is respectively connected with the power management chip and the follow current circuit, and the other end of the main inductor is coupled with a homonymous end or a synonym end of at least one auxiliary inductor.
Further, the homonymous terminal or the synonym terminal of each auxiliary inductor is coupled with the other terminal of the main inductor, or,
the N auxiliary inductors are coupled to the main inductor after being coupled in a cascade manner.
Further, the number of the auxiliary inductors is not less than 1 and not more than 4.
Furthermore, each output rectifying and filtering circuit comprises a diode and a filtering capacitor, the anode of the diode is connected with the output end of the multi-winding inductance unit, the cathode of the diode is used for outputting the output voltage of the auxiliary circuit where the diode is located, the anode of the filtering capacitor is connected with the cathode of the diode, and the cathode of the filtering capacitor is connected with the signal ground.
Further, the input rectification filter circuit comprises an input rectification circuit and a filter circuit, the input rectification circuit comprises a full-wave rectification circuit or a half-wave rectification circuit, and the filter circuit comprises a filter capacitor.
Further, the feedback circuit includes any one of a diode, a regulator tube, and a resistor.
Further, the freewheel circuit includes a device having a switching or unidirectional conduction characteristic.
Further, the topology type of the multi-output switching power supply comprises Buck or Buck-Boost.
According to the multi-output switching power supply provided by the invention, the multi-winding inductance unit is arranged in the multi-output switching power supply, so that the output voltage of the auxiliary circuit can be obtained after mutual inductance coupling superposition based on the main circuit output voltage, the stable and high-precision auxiliary circuit output voltage can be obtained under the condition that the main circuit output voltage is stable and high in precision, and a voltage stabilizing device and the like do not need to be additionally used in the auxiliary circuit, so that the circuit cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a block diagram of a multiple-output switching power supply provided by the present invention.
Fig. 2 is a schematic circuit diagram of a Buck topology implementation of the multiple output switching power supply provided by the present invention.
Fig. 3 is a schematic circuit diagram of another Buck topology implementation of the multiple-output switching power supply provided by the invention.
Fig. 4 is a circuit schematic diagram of another Buck-Boost topology implementation of the multiple-output switching power supply provided by the invention.
Fig. 5 is a circuit schematic diagram of a Buck-Boost topology implementation of the multiple output switching power supply provided by the invention.
Fig. 6 is a circuit schematic diagram of another Buck-Boost topology implementation of the multiple-output switching power supply provided by the invention.
Fig. 7 is a schematic circuit diagram of another Buck topology implementation of the multiple output switching power supply provided by the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make those skilled in the art better understand the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to solve the problems of high cost and poor voltage precision of the auxiliary power supply in the prior art, in this embodiment, a multiple output switching power supply is provided, and fig. 1 is a block diagram of a multiple output switching power supply 10 provided according to an embodiment of the present invention, as shown in fig. 1, including: the power supply comprises an input rectifying and filtering circuit 100, a power supply management chip 200, a multi-winding inductance unit 300, a feedback circuit 400, a follow current circuit 500 and an output rectifying and filtering circuit 600, wherein the input rectifying and filtering circuit 100, the multi-winding inductance unit 300, the feedback circuit 400 and the follow current circuit 500 are all connected with the power supply management chip 200, and the output rectifying and filtering circuit 600 is connected with the multi-winding inductance unit 300;
the input rectifying and filtering circuit 100 is configured to perform rectifying and filtering processing on an input voltage;
the power management chip 200 can adaptively adjust the switching duty ratio to convert the input voltage after the rectification and filtering processing and then obtain the main circuit output voltage through the feedback adjustment of the feedback circuit 400;
the multi-winding inductive unit 300 is capable of inductively coupling and superimposing with the main circuit output voltage to obtain an alternating voltage;
the output rectifying and filtering circuit 600 is configured to perform rectifying and filtering processing on the alternating voltage to obtain an nth auxiliary circuit output voltage, where N is an integer greater than or equal to 1, and each auxiliary circuit output voltage corresponds to one output rectifying and filtering circuit;
the freewheel circuit 500 is used to form a freewheel path between the multi-winding inductive element and the main circuit output voltage.
In the embodiment of the invention, the multi-winding inductance unit is arranged in the multi-output switching power supply, so that the output voltage of the auxiliary circuit can be obtained after mutual inductance coupling superposition based on the main circuit output voltage, the stable and high-precision auxiliary circuit output voltage can be obtained under the condition that the main circuit output voltage is stable and high in precision, and a voltage stabilizing device and the like do not need to be additionally used in the auxiliary circuit, so that the circuit cost is reduced. Therefore, the multi-output switching power supply provided by the invention has the advantages of low cost and high precision of the output voltages of the main circuit and the auxiliary circuit.
It should be understood that each output voltage of the auxiliary circuit corresponds to an output rectifying and filtering circuit, and specifically, each output rectifying and filtering circuit includes a diode and a filtering capacitor, an anode of the diode is connected to the output end of the multi-winding inductance unit, a cathode of the diode is used for outputting the output voltage of the auxiliary circuit, an anode of the filtering capacitor is connected to the cathode of the diode, and a cathode of the filtering capacitor is connected to the signal ground.
It should be noted that, in the embodiment of the present invention, the topology type of the multiple-output switching power supply includes Buck or Buck-Boost.
In particular, in order to improve the accuracy of the output voltage of the auxiliary circuit, the multi-winding inductor unit 300 includes a main inductor and N auxiliary inductors wound on the same magnetic element,
said main inductor is for supplying said main output voltage in said freewheel path,
each auxiliary inductor is coupled with the main inductor to realize mutual inductance coupling superposition with the main circuit output voltage to obtain an alternating voltage.
It should be understood that each auxiliary inductor is coupled with the main inductor, so that the output voltage of the auxiliary circuit can be formed by coupling and superposing on the basis of the output voltage of the main circuit, and the accuracy of the output voltage of the auxiliary circuit after coupling and superposition can be ensured because the accuracy of the output voltage of the main circuit is high.
In the embodiment of the present invention, one end of the main inductor is respectively connected to the power management chip 200 and the freewheeling circuit 500, and the other end of the main inductor is coupled to a homonymous terminal or a synonym terminal of at least one auxiliary inductor.
It should be understood that the main inductor is used in the main circuit to implement voltage transformation of the main circuit, and finally form the main circuit output voltage, and the auxiliary inductor is coupled with the main inductor to implement mutual inductance coupling, so as to obtain the auxiliary circuit output voltage.
In addition, the homonymous terminal or the heteronymous terminal of each auxiliary inductor is coupled to the other end of the main inductor, or N auxiliary inductors are coupled to the main inductor after being coupled in a cascade manner.
In the embodiment of the present invention, each of the auxiliary inductors may be coupled to the other end of the main inductor, or a plurality of auxiliary inductors may be coupled to the main inductor in a cascade manner, and any coupling form can achieve mutual inductance coupling with the main inductor.
It should be understood that, considering the precision of the output voltage and the number of commonly used power output circuits, the number of the auxiliary inductors is not less than 1 and not more than 4.
As shown in fig. 2, the Buck circuit with multiple outputs has at least two output power sources, including a power management chip 200, a multi-winding inductor unit 300, a feedback circuit 400, a freewheeling circuit 500, and N output rectifying and filtering circuits 600. The switching power supply can comprise a safety circuit F1, a voltage dependent resistor MOV1, a rectifying circuit BD1, a first filter capacitor C6, and an input alternating voltage Vac through an L end and an N end of the switching power supply.
In the embodiment of the invention, the power management chip 200 (i.e., the power chip U1), the freewheeling diode D6, the diode D1 in the feedback circuit 400, the filter capacitor C7, the multi-winding inductance unit 300, and the filter capacitor C1 together form a Buck main circuit, and the main circuit output voltage Vo _1 with stable direct current can be obtained by adaptively adjusting the switching duty ratio of the power chip U1. Because the main-circuit output voltage Vo _1 is introduced into the feedback circuit 400 and the filter capacitor C7 for sampling and is fed back to the inside of the power chip U1 for regulation control, the accuracy of the Vo _1 output voltage is high.
It should be noted here that the power chip U1 can be implemented by a power chip having a PN8036 model and used for microelectronics.
The second auxiliary output voltage Vo _2 is obtained by mutual-inductance coupling superposition of the first auxiliary inductor L1_2-3 and the main inductor L1_1-2 in the multi-winding inductor unit 300 to obtain an alternating voltage, and then is rectified and filtered by the diode D2 and the filter capacitor C2 in the output rectifying and filtering circuit 600 to obtain the second auxiliary output voltage Vo _2, and the second auxiliary output voltage Vo _2 directly obtained in this way has higher voltage precision. The nth auxiliary circuit output voltage Vo _ N is obtained by mutual inductance coupling superposition of the nth auxiliary inductor L1_2-N and the main inductor L1_1-2, and then is rectified and filtered by an nth diode Dn and an nth filter capacitor Cn in the nth output rectifying and filtering circuit to obtain the nth auxiliary circuit output voltage Vo _ N.
It should be understood that the main output voltage is adjusted by the feedback circuit, so that the method has the advantage of high precision; the output voltage of the auxiliary circuit is realized by mutual inductance coupling superposition of the auxiliary inductor and the main inductor, so that the precision requirement of the output voltage of the auxiliary circuit can be met, the auxiliary inductor and the main inductor are wound on the same magnetic element, and the auxiliary circuit does not need to be additionally provided with a voltage stabilizer and the like, so that the precision of the auxiliary circuit is improved, and the circuit cost is reduced.
In the embodiment of the present invention, the multi-winding inductance unit 300 includes N inductors, where the N inductors are wound on the same magnetic component together, and the multi-winding inductance unit 300 shown in fig. 2 includes 3 inductors, where a first inductor formed by winding terminals 1-2 is a main inductor L1_1-2, a terminal 1 of the main inductor is coupled to the power management chip U1 and the freewheeling circuit 500, and a terminal 2 of the main inductor is coupled to the feedback circuit 400 and the filter capacitor C1. And a second inductor L1_2-3 formed by winding a terminal 2-3 of the multi-winding inductor unit, wherein a terminal 2 is coupled to the feedback circuit 400, the terminals C1 and Vo _1 of the filter capacitor, and a terminal 3 is coupled to a diode D2 in the rectifying and filtering circuit. The terminal 2- (N + 1) of the multi-winding inductor unit 300 is wound to form an nth inductor L1_2- (N + 1), the terminal 2 thereof is coupled to the feedback circuit and the terminals of the filter capacitors C1 and Vo _1, and the terminal (N + 1) thereof is coupled to the diode Dn in the rectifying and filtering circuit. As can be seen, all the inductors connected to the auxiliary circuit output are coupled to the main inductor L1_ 1-2; or all of the inductors connected to the auxiliary output are coupled to the main inductor L1_1-2 in a direct or indirect manner.
In a specific implementation, referring to fig. 2 and 3, the different-name terminals of the main winding inductors in the multi-winding inductor unit are respectively coupled with the same-name terminals of all the auxiliary winding inductors to form a series connection. The synonym terminal of the primary winding inductor in the multi-winding inductor unit 300 is coupled to the synonym terminal of the secondary winding inductor, and the synonym terminal of the secondary winding inductor is coupled to the synonym terminal of the nth secondary winding inductor to form a series connection. In the embodiment of the invention, the voltage of the main circuit Vo _1 of the multi-path Buck is required to be smaller than that of the auxiliary circuit Vo _ n. By adopting the mode that the auxiliary winding inductance is directly or indirectly superposed on the main winding inductance, the multi-output Buck circuit can obtain higher output voltage precision, stronger loading capacity and higher conversion efficiency.
In the embodiment of the invention, the switching power supply circuit with the multiplexed output can be a Buck circuit or a Buck-Boost circuit. And the calculation expressions of all output voltages of any Buck and Buck-Boost multi-output circuit are the same.
As shown in fig. 4, a Buck _ Boost circuit diagram suitable for multiple outputs in the embodiment of the present invention is shown. In fig. 4, the ground of the input filter capacitor C6 is coupled to the output main circuit terminal Vo _1, and the different-name terminals of the main circuit winding inductors in the multi-winding inductor unit are coupled to the same-name terminals of all the auxiliary circuit winding inductors, respectively, to form a series connection.
As shown in fig. 5, another Buck _ Boost circuit diagram suitable for multi-output in the embodiment of the present invention is provided. In fig. 5, the ground of the input filter capacitor C6 is coupled to the output main circuit terminal Vo _1, the different-name terminal of the main winding inductor in the multi-winding inductor unit is coupled to the same-name terminal of the second auxiliary winding inductor, and the different-name terminal of the second auxiliary winding inductor is coupled to the same-name terminal of the nth auxiliary winding inductor, so as to form a series connection.
As shown in fig. 6, another multi-output Buck-Boost circuit diagram in the embodiment of the present invention is shown. In fig. 6, the rectifier circuit is a half-wave rectifier circuit, the half-wave rectifier circuit includes a diode D7 and a diode D8, and the diode D7 is connected in series with the diode D8.
As shown in fig. 7, another multi-output Buck circuit diagram in an embodiment of the present invention is shown. In fig. 7, the rectifier circuit is a half-wave rectifier circuit, the half-wave rectifier circuit includes a diode D7 and a diode D8, and the diode D7 is connected in series with the diode D8.
It should be noted that, in the embodiment of the present invention, the Buck or the Buck-Boost circuit outputs the specific voltage values of Vo _1, vo _2, and Vo _ n, the number and the inductance of the inductors included in the multi-winding inductor unit, and the specific parameters of the feedback circuit, the freewheeling circuit, and the rectifying and filtering circuit may be set according to the practical scenario, and the specific values thereof may not substantially affect the protection of the present invention.
In the embodiment of the invention, after the main circuit output voltage Vo _1 is set, the output voltages of other circuits are proportional to the number of turns of the main circuit inductor through setting the number of turns of each auxiliary circuit inductor in the multi-winding unit, so that the desired multi-path output voltage can be obtained.
According to the embodiment of the invention, when the switch tube inside the power management chip is turned on, the diode D1 of the feedback circuit 400, the diode D6 of the freewheel circuit 500 and the output regulator are turned onThe diode D2 \8230A \8230Dnof the current filter circuit 600 is in a closed state, and the input high-voltage power supply supplies energy to the main circuit Vo _1 after being reduced by the voltage of the inductor L1_1-2, and meanwhile, the inductor L1_1-2 is charged to store energy. When the switch tube in the power management chip 200 is turned off, the inductor L1_1-2 supplies power to the power management chip 200 through the feedback circuit 400 and samples the voltage of Vo-1, and the inductor L1_1-2 forms a follow current path through the follow current circuit D6 to supply power to the load of Vo _ 1; the inductor L1_1-3 supplies power to the Vo _2 load through the rectifying and filtering circuits D2 and C2; the inductor L1_1- (n + 1) supplies power to the Vo _ n load through the rectifying and filtering circuits Dn and Cn.
Wherein VCC _ RER represents the internal sampling reference voltage of the power management chip 200, and VF _1 and VF _6 are the normal conduction voltage drops of the diode D1 and the diode D6, respectively; as can be seen from the above equation, the voltage Vo _1 is mainly determined by VCC _ REF.
The Buck second output voltage Vo _2 is:
q1_2 and Q2_3 respectively represent the number of turns of the main circuit inductor and the second circuit inductor, and VF _2 is forward voltage drop of a diode D2; as can be seen from the above equation, neglecting the voltages of VF _2 and VF _6, the voltage of Vo _2 is mainly overlapped by the voltage of Vo _1 and the sum of the voltage of Vo _1 multiplied by Q2-3/Q1_ 2.
The N-th output voltage Vo _ N of Buck is as follows:
q2_ (N + 1) represents the turn number of the Nth inductor, and VF _ N is the forward voltage drop of the diode Dn; as can be seen from the above formula, after ignoring the VF _ n voltage, the Vo _ n voltage is mainly formed by superposing the sum of the Vo _1 voltage multiplied by Q2- (n + 1)/Q1 _2 by the Vo _1 voltage.
From the above calculation formula, the main circuit voltage Vo _1 is the lowest, and the output voltage magnitude is only related to VCC _ REF; the output voltage Vo _ n of other paths is higher than the main path Vo _1, the output voltage is related to Vo _1 and the inductance turn ratio Q2- (n + 1)/Q1 _2, and the required specific voltage Vo _ n can be obtained through the design of the inductance turn ratio.
As known from the expression of the auxiliary circuit N-path output voltage, the Vo _ N output voltage contains a fixed constant Vo _1, and the Vo _1 voltage which is Q2- (N + 1)/Q1 _2 times is superposed on the basis of the high-precision main circuit output voltage Vo _1, so that a Buck or Buck-Boost power supply which is output in multiple paths at high precision can be realized, the load carrying capacity of the auxiliary circuit and the efficiency of a power supply system can be effectively improved, and the system cost of the power supply is remarkably reduced.
In an embodiment of the present invention, the input rectification filter circuit includes an input rectification circuit and a filter circuit, the input rectification circuit includes a full-wave rectification circuit or a half-wave rectification circuit, and the filter circuit includes a filter capacitor. In the above embodiment, it can be seen that the rectifier circuits shown in fig. 2 to 5 are all full-wave rectifier circuits, and the rectifier circuits shown in fig. 6 and 7 are all half-wave rectifier circuits, and the filter circuit includes the filter capacitor C6.
In the embodiment of the present invention, the feedback circuit 400 may specifically include any one of a diode, a voltage regulator and a resistor.
As shown in fig. 2 to 7, the feedback circuit 400 includes a diode D1.
In an embodiment of the present invention, the freewheel circuit 500 includes a device having a switching or unidirectional turn-on characteristic.
As shown in fig. 2 to 7, the freewheel circuit 400 includes a diode D6.
In summary, the multi-output switching power supply provided by the invention can enable the auxiliary circuit inductor and the main circuit inductor to perform mutual inductance coupling superposition by arranging the multi-winding inductor unit, and can ensure the precision of the coupled and superposed auxiliary circuit voltage due to the high precision of the main circuit output voltage, so that compared with the prior art, the multi-output switching power supply provided by the invention can effectively improve the precision of the auxiliary circuit output voltage, effectively improve the auxiliary circuit output load capacity and efficiency, and simultaneously significantly reduce the system cost of the power supply.
It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A multiple output switching power supply, comprising: the power supply comprises an input rectification filter circuit, a power supply management chip, a multi-winding inductance unit, a feedback circuit, a follow current circuit and an output rectification filter circuit, wherein the input rectification filter circuit, the multi-winding inductance unit, the feedback circuit and the follow current circuit are all connected with the power supply management chip, and the output rectification filter circuit is connected with the multi-winding inductance unit;
the input rectifying and filtering circuit is used for rectifying and filtering the input voltage;
the power management chip can adaptively adjust the duty ratio of a switch so as to convert the input voltage after rectification and filtering and obtain the output voltage of the main circuit through the feedback adjustment of the feedback circuit;
the multi-winding inductive unit can be inductively coupled and superposed with the main circuit output voltage to obtain an alternating voltage;
the output rectifying and filtering circuit is used for rectifying and filtering the alternating voltage to obtain an Nth auxiliary circuit output voltage, wherein N is an integer greater than or equal to 1, and each auxiliary circuit output voltage corresponds to one output rectifying and filtering circuit;
the freewheeling circuit is used to form a freewheeling path between the multi-winding inductive unit and the main circuit output voltage.
2. The multiple-output switching power supply of claim 1,
the multi-winding inductance unit comprises a main inductance and N auxiliary inductances which are wound on the same magnetic element,
the main inductor is for supplying power to the main circuit output voltage in the freewheel path,
each auxiliary inductor is coupled with the main inductor so as to realize mutual inductance coupling superposition with the main circuit output voltage to obtain an alternating voltage.
3. The multiple-output switching power supply according to claim 2, wherein one end of the main inductor is connected to the power management chip and the freewheeling circuit, and the other end of the main inductor is coupled to a homonymous terminal or a heteronymous terminal of at least one auxiliary inductor.
4. The multiple-output switching power supply according to claim 3,
the homonymous terminal or the heteronymous terminal of each auxiliary inductor is coupled with the other end of the main inductor, or,
the N auxiliary inductors are coupled to the main inductor after being coupled in a cascade.
5. The multiple-output switching power supply according to claim 2, wherein the number of the auxiliary inductors is not less than 1 and not more than 4.
6. The multiple-output switching power supply according to any one of claims 1 to 5, wherein each of the output rectifying and filtering circuits includes a diode and a filtering capacitor, an anode of the diode is connected to the output terminal of the multiple-winding inductance unit, a cathode of the diode is used for outputting the output voltage of the auxiliary circuit, an anode of the filtering capacitor is connected to the cathode of the diode, and a cathode of the filtering capacitor is connected to the signal ground.
7. The multiple-output switching power supply according to any one of claims 1 to 5, wherein the input rectifying and filtering circuit includes an input rectifying circuit and a filtering circuit, the input rectifying circuit includes a full-wave rectifying circuit or a half-wave rectifying circuit, and the filtering circuit includes a filter capacitor.
8. The multiple-output switching power supply according to any one of claims 1 to 5, wherein the feedback circuit includes any one of a diode, a regulator tube and a resistor.
9. A multiple-output switching power supply according to any one of claims 1 to 5, wherein the free-wheeling circuit comprises devices having switching or unidirectional turn-on characteristics.
10. The multi-output switching power supply according to any one of claims 1 to 5, wherein the topology type of the multi-output switching power supply comprises Buck or Buck-Boost.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211609135.9A CN115622418A (en) | 2022-12-15 | 2022-12-15 | Multi-output switching power supply |
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| CN202211609135.9A CN115622418A (en) | 2022-12-15 | 2022-12-15 | Multi-output switching power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204795665U (en) * | 2015-07-13 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and electromagnetic heating system's power supply circuit |
| CN113852280A (en) * | 2021-09-22 | 2021-12-28 | 珠海拓芯科技有限公司 | Dual-output voltage reduction circuit, power supply unit and air conditioner |
| CN217362927U (en) * | 2022-04-27 | 2022-09-02 | 宁波奥克斯电气股份有限公司 | Multi-output power circuit, power supply module and air conditioner |
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- 2022-12-15 CN CN202211609135.9A patent/CN115622418A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204795665U (en) * | 2015-07-13 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and electromagnetic heating system's power supply circuit |
| CN113852280A (en) * | 2021-09-22 | 2021-12-28 | 珠海拓芯科技有限公司 | Dual-output voltage reduction circuit, power supply unit and air conditioner |
| CN217362927U (en) * | 2022-04-27 | 2022-09-02 | 宁波奥克斯电气股份有限公司 | Multi-output power circuit, power supply module and air conditioner |
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Application publication date: 20230117 |