CN111082667A - Multi-output switching power supply - Google Patents
Multi-output switching power supply Download PDFInfo
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- CN111082667A CN111082667A CN202010073793.5A CN202010073793A CN111082667A CN 111082667 A CN111082667 A CN 111082667A CN 202010073793 A CN202010073793 A CN 202010073793A CN 111082667 A CN111082667 A CN 111082667A
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- 238000004804 winding Methods 0.000 claims abstract description 96
- 238000002955 isolation Methods 0.000 claims description 72
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 14
- 239000002184 metal Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
- AIXMJTYHQHQJLU-UHFFFAOYSA-N chembl210858 Chemical compound O1C(CC(=O)OC)CC(C=2C=CC(O)=CC=2)=N1 AIXMJTYHQHQJLU-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- 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
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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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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Abstract
The invention relates to a multi-output switch power supply, comprising: the transformer comprises a primary winding, a secondary winding, an input switch circuit, a voltage input end, N output switch circuits, a feedback circuit and a control circuit, wherein the input switch circuit and the voltage input end are connected with the primary winding; the control circuit is used for generating a first control signal to control the conduction of the output switch circuit and acquiring a feedback signal of the output end through a feedback circuit corresponding to the output switch circuit; the control circuit is also used for generating a second control signal to control the input switch circuit to be switched on or switched off when the output switch circuit is switched on. The invention can realize the independent control of the multi-path output through a simple circuit.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a multi-output switching power supply.
Background
The flyback converter is widely used for various consumer electronics products and is a main topology of a medium and small power supply. With the increasing popularity of portable electronic products, the need to utilize one power source to power multiple terminal products is also increasing. In order to reduce the cost, a method of generating multiple outputs by using one isolation transformer is commonly used.
The conventional multiplexing method is shown in fig. 1, in which TX1 is a transformer having 1 primary winding Np and 2 secondary windings Ns1 and Ns 2. 1 primary side switch Q1. The 2 secondary windings are connected to rectifier tubes D1 and D2, respectively, to provide 2 DC outputs Vout1 and Vout 2. With the coupling characteristics of the transformer, a nearly proportional relationship is formed between the voltages of the 2 outputs (or more outputs). The output voltage provides a control quantity to the primary side controller through sampling resistors R1, R2 and R3 and a compensating feedback circuit to FB. The controller adjusts the output value by controlling the on and off times of Q1. This method is simple, but each output cannot be controlled independently, but is determined by the proportional relationship between the secondary windings Ns1 and Ns2 of the transformer and the load of each output.
In order to generate multiple output voltages independent of the transformation ratio of the transformer windings, some existing circuits add a voltage regulator in series at the output end of one or multiple output terminals, so that the corresponding output voltage is independent of the transformation ratio of the transformer windings through the additional voltage regulator. However, the regulator reduces the power conversion efficiency, generates additional losses, and increases the cost of the system. In some circuits, a plurality of independent flyback converters are adopted, namely each output path is provided with a corresponding transformer, a primary side switch and a peripheral circuit thereof to realize the complete independent adjustment of multipath output, thereby greatly increasing the system volume and the cost.
Disclosure of Invention
The present invention provides a multiple-output switching power supply, which is directed to overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a multiple output switching power supply comprising: the transformer comprises a primary winding, a secondary winding, an input switch circuit, a voltage input end, N output switch circuits, a feedback circuit and a control circuit, wherein the input switch circuit and the voltage input end are connected with the primary winding;
the control circuit is used for generating a first control signal to control the output switch circuit to be conducted, and acquiring a feedback signal of the output end through the feedback circuit corresponding to the output switch circuit;
the control circuit is further used for generating a second control signal to control the input switch circuit to be switched on or switched off when the output switch circuit is switched on.
Preferably, the first and second electrodes are formed of a metal,
the control circuit comprises a first control module and a second control module;
the first control module is used for generating a second control signal, and the second control module is used for generating a first control signal.
Preferably, the first and second electrodes are formed of a metal,
the control circuit further comprises an isolation module connected with the first control module and/or the second control module, a first isolation end of the isolation module and the primary winding are arranged in a common-ground mode, and a second isolation end of the isolation module and the secondary winding are arranged in a common-ground mode.
Preferably, the first and second electrodes are formed of a metal,
the isolation module comprises a photoelectric coupling module, a first end of a light emitting diode of the photoelectric coupling module is connected with the second control module, a second end of the light emitting diode of the photoelectric coupling module is grounded and is grounded with the second control module, a first end of a phototriode of the photoelectric coupling module is connected with the first control module, and a second end of the phototriode of the photoelectric coupling module is grounded and is grounded with the first control module; the first control module and the primary winding are arranged in a common-ground mode, and the second control module and the secondary winding are arranged in a common-ground mode; or
The isolation module comprises a first isolation coil, a first end and a second end of the first isolation coil are connected with the first control module, and a third end and a fourth end of the first isolation coil are connected with the input switch circuit; the first control module is connected with the second control module and is arranged in common with the secondary winding, and the second control module is connected with the output switch circuit; or
The isolation module comprises a second isolation coil, a first end and a second end of the second isolation coil are respectively connected with the second control module, a third end and a fourth end of the second isolation coil are connected with the output switch circuit, the second control module is connected with the first control module and is arranged in common with the primary winding, and the first control module is connected with the input switch circuit.
Preferably, the first and second electrodes are formed of a metal,
the first control module includes:
the first switch driving module is connected with the input switch circuit or connected with a first end and a second end of the first isolation coil;
the second control module includes:
a switch cycle counting module connected with the secondary winding or the input switch circuit and used for acquiring the current switch cycle sequence of the input switch circuit,
a switching module connected with the switching period counting module and used for acquiring the current switching period sequence of the input switching circuit and outputting a first switching signal and a second switching signal,
the second switch driving module is connected with the switching module and used for receiving the first switching signal to switch the output switch circuit to be conducted, wherein the second switch driving module is connected with the first end and the second end of the output switch circuit or the second isolation coil;
and the feedback switch circuit is respectively connected with the feedback circuit and the switching module and is used for receiving a second switching signal to switch the feedback circuit to be in conductive connection with the first control module.
Preferably, the first and second electrodes are formed of a metal,
the feedback circuit comprises an operational amplifier and a loop compensation module connected with the operational amplifier.
Preferably, the first and second electrodes are formed of a metal,
the feedback circuit further comprises an auxiliary winding coupled with the secondary winding, and one input end of the operational amplifier is connected with the auxiliary winding.
Preferably, the first and second electrodes are formed of a metal,
the secondary winding comprises a plurality of secondary windings, and each secondary winding is connected with one or more output switch circuits.
Preferably, the first and second electrodes are formed of a metal,
the output switch circuit comprises a rectifier tube and a change-over switch, wherein the first end of the rectifier tube is connected with the secondary winding, the second end of the rectifier tube is connected with the first end of the change-over switch, the second end of the change-over switch is connected with the output end, and the control end of the change-over switch is connected with the control circuit; or
The output switch circuit comprises a bidirectional blocking switch, the first end of the bidirectional blocking switch is connected with the secondary winding, the second end of the bidirectional blocking switch is connected with the output end, and the control end of the bidirectional blocking switch is connected with the control circuit.
Preferably, the feedback circuit comprises a current feedback circuit and a voltage feedback circuit respectively connected to the output terminals.
The multi-output switching power supply has the following beneficial effects: independent control of the multiplexed output is achieved through a simple circuit.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit schematic of a related multiple output switching power supply;
fig. 2 is a schematic structural diagram of a multiple-output switching power supply according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another embodiment of a multiple-output switching power supply of the present invention;
fig. 4 is a schematic structural diagram of another embodiment of a multiple-output switching power supply of the present invention;
FIG. 5 is a circuit schematic of an embodiment of a multiple output switching power supply of the present invention;
FIG. 6 is a circuit schematic of another embodiment of a multiple output switching power supply of the present invention;
FIG. 7 is a circuit schematic of another embodiment of a multiple output switching power supply of the present invention;
FIG. 8 is a circuit schematic of another embodiment of a multiple output switching power supply of the present invention;
FIG. 9 is a circuit schematic of another embodiment of a multiple output switching power supply of the present invention;
FIG. 10 is a circuit schematic of another embodiment of a multiple output switching power supply of the present invention;
FIG. 11 is a schematic diagram of the operation of an embodiment of a multiple output switching power supply of the present invention;
fig. 12 is a schematic diagram of the operation of another embodiment of the multiple-output switching power supply of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 2, in a first embodiment of a multiple-output switching power supply of the present invention, the multiple-output switching power supply includes: the transformer 20 comprises a primary winding 210 and a secondary winding 220, an input switch circuit 30 and a voltage input end 10 which are connected with the primary winding 210, N output switch circuits 40 which are connected with the secondary winding 220, wherein N is an integer larger than 1, output ends 50 which are respectively and correspondingly connected with the output switch circuits 40, feedback circuits 60 which are respectively connected with the output ends 50, and control circuits which are respectively connected with the input switch circuit 30, the output switch circuits 40 and the feedback circuits 60; the control circuit is used for generating a first control signal to control the output switch circuit 40 to be conducted, and acquiring a feedback signal of the output end 50 through a feedback circuit 60 corresponding to the output switch circuit 40; the control circuit is further configured to turn on the output switch circuit 40 to generate a second control signal to control the input switch circuit 30 to turn on or off. Specifically, in the switching power supply, the voltage input is input to the primary winding 210 through the voltage input terminal 10, and then the output is provided through the secondary winding 220 corresponding to the primary winding 210. Corresponding output switch circuits 40 are respectively arranged between the secondary windings 220 and the output ends 50 of the N-path outputs, and the control circuit controls the on/off of the output switch circuits 40 to control the corresponding conductive connection between the secondary windings 220 and the corresponding output ends 50, so that the outputs of the secondary windings 220 are conducted and output through the required output ends 50. Meanwhile, the output end 50 of each path is provided with a feedback circuit 60 connected with the control circuit, the control circuit obtains a feedback signal corresponding to the output of each output end 50 through the feedback circuit 60, and the control circuit controls the input switch circuit 30 to be switched on or off according to the feedback signal, mainly controls the switching-on and switching-off time of the input switch circuit to adjust the input of the primary winding 210, so that the corresponding output end 50 can meet the output requirement finally. The switching of the output switch circuits 40 may be set according to a preset rule, and which output switch circuit 40 is turned on adjusts the output of which output terminal 50 is turned on.
As shown in FIG. 3, in one embodiment, the control circuit includes a first control module 71 and a second control module 72; the first control module 71 is configured to generate the second control signal, and the second control module 72 is configured to generate the first control signal. Specifically, the first control signal and the second control signal can be generated by two independent control modules, that is, the first control module 71 controls the input switch circuit 30, and the second control module 72 controls the output switch circuit 40.
As shown in fig. 4, in an embodiment, the control circuit further includes an isolation module 73 connected to the first control module 71 and/or the second control module 72, a first isolation terminal of the isolation module 73 is commonly disposed with the primary winding 210, and a second isolation terminal of the isolation module 73 is commonly disposed with the secondary winding 220. Specifically, in some scenarios, the primary winding 210 and the secondary winding 220 need to be electrically isolated by different grounding arrangements, so that signal transmission is realized in the control circuit through the isolation module 73 while the primary and secondary sides are electrically isolated, a first isolation end of the isolation module 73 is arranged in common with the primary winding 210, and a second isolation end of the isolation module 73 is arranged in common with the secondary winding 220. As shown in fig. 5 and 6, in some embodiments, wherein the first control module 71 and the second control module 72 are connected via the isolation module 73, different configurations of the first control module 71 and the second control module 72 are implemented, such as the first control module 71 being common to the primary winding 210 and the second control module 72 being common to the secondary winding 220.
As shown in fig. 7, in an embodiment, the isolation module 73 includes a photoelectric coupling module, a first end of the light emitting diode of the photoelectric coupling module is connected to the second control module 72, a second end of the light emitting diode of the photoelectric coupling module is grounded and is grounded with the second control module 72, a first end of the phototransistor of the photoelectric coupling module is connected to the first control module 71, and a second end of the phototransistor of the photoelectric coupling module is grounded and is grounded with the first control module 71; the first control module 71 is arranged in common with the primary winding 210, and the second control module 72 is arranged in common with the secondary winding 220; specifically, the isolation module 73 may implement isolation by using a photoelectric coupling module, wherein a light emitting diode terminal of the photoelectric coupling module is connected to the second control module 72 and is disposed together with the second control module 72 and the secondary winding 220, and a phototransistor of the photoelectric coupling module is connected to the first control module 71 and is disposed together with the first control module 71 and the primary winding 210.
As shown in fig. 8, in an embodiment, the isolation module 73 includes a first isolation coil, a first end and a second end of the first isolation coil are connected to the first control module 71, and a third end and a fourth end of the first isolation coil are connected to the input switch circuit 30; the first control module 71 is connected with the second control module 72 and is arranged in common with the secondary winding 220, and the second control module 72 is connected with the output switch circuit 40; specifically, the isolation module 73 may implement isolation through a first isolation coil, where the first isolation coil includes two coils isolated from each other, one coil winding is connected to the input switch circuit 30, and is implemented to be commonly connected to the primary winding 210 through the input switch circuit 30, the other coil winding is connected to the first control module 71, the first control module 71 is connected to the second control module 72, and the second control module 72 is connected to the output switch circuit 40, so as to implement being commonly connected to the secondary winding 220.
As shown in fig. 9, in an embodiment, the isolation module 73 includes a second isolation coil, a first end and a second end of the second isolation coil are respectively connected to the second control module 72, a third end and a fourth end of the second isolation coil are connected to the output switch circuit 40, the second control module 72 is connected to the first control module 71 and is disposed in common with the primary winding 210, and the first control module 71 is connected to the input switch circuit 30. Specifically, the isolation module 73 can achieve isolation through a second isolation coil, the second isolation coil includes two coils isolated from each other, one coil winding is connected to the output switch circuit 40, and the coil winding and the primary winding 210 achieve common ground setting through the output switch circuit 40, the other coil winding is connected to the second control module 72, the second control module 72 and the first control module 71 are connected to each other, and the first control module 71 is connected to the input switch circuit 30, so as to achieve common ground setting with the primary winding 210. It is understood that the second isolation coil may be multiple, that is, each second isolation coil corresponds to one output switch circuit 40, and isolation of each output is achieved.
7-9, in one embodiment, the first control module 71 includes: a PWM signal output module 712 for outputting a duty ratio signal, and a first switch driving module 711 connected to the PWM signal output module 712, wherein the first switch driving module 711 is connected to the input switch circuit 30 or connected to the first end and the second end of the first isolation coil; the second control module 72 includes: a switching cycle counting module 721 connected to the secondary winding 220 or the input switching circuit 30 for acquiring the current switching cycle sequence of the input switching circuit 30, a switching module 723 connected to the switching cycle counting module 721 for acquiring the current switching cycle sequence of the input switching circuit 30 and outputting a first switching signal and a second switching signal; a second switch driving module 722 connected to the switching module 723 and configured to receive the first switching signal to switch on the output switch circuit 40, wherein the second switch driving module is connected to the output switch circuit 40 or a first end and a second end of the second isolation coil; the feedback switch circuit 724 is connected to the feedback circuit 60 and the switching module 723, respectively, and is configured to receive a second switching signal to switch the feedback circuit 60 to be in conductive connection with the first control module 71. Specifically, the first control module 71 outputs a duty ratio signal with a certain duty ratio through the PWM signal output module 712, and drives the first switch driving module 711 to output a driving signal, i.e., a second control signal, so as to drive the input switch circuit 30 to be turned on or off for a certain duration through the duty ratio signal, wherein the first switch driving module 711 may be directly connected to the input switch circuit 30 or may be connected to the input switch circuit 30 through the first isolation coil. The duty ratio is set through the PWM signal, and the output of each path can be set to correspond to the same or different duty ratios. In the second control module 72, the current switching cycle sequence of the input switch circuit 30 may be obtained through the switching cycle counting module 721, that is, the switching cycle sequence of the input switch circuit 30 is recorded through the cycle counting module 721, so as to determine the output terminal 50 to be connected according to the preset timing, that is, in the second control module 72, the first switching signal and the second switching signal are output through the switching module 723, and the second switch driving module 722 is controlled to operate through the first switching signal, so as to control the output switch circuit 40 to be turned on or off, wherein the second switch driving module 722 may be directly connected to the output switch circuit 40, or may be connected to the output switch circuit 40 through the second isolation coil. It can also control the feedback circuit 60 to turn on or off through the feedback switch circuit 724 by the second switching signal. It is understood that the first switching signal and the second switching signal correspond.
As shown in fig. 7-9, in one embodiment, the feedback circuit 60 includes an operational amplifier and a loop compensation module coupled to the operational amplifier. Specifically, the feedback circuit 60 is composed of a commonly used operational amplifier and a loop compensation module, a first input terminal of the operational amplifier is connected to the output terminal 50, the output terminal 50 of the operational amplifier is connected to the PWM signal output module, a second input terminal of the operational amplifier inputs a reference voltage, and the first input terminal of the operational amplifier is connected to the output terminal 50 of the operational amplifier via the loop compensation module.
Further, in an embodiment, the feedback circuit 60 further includes an auxiliary winding coupled to the secondary winding 220, and the inverting input of the operational amplifier is connected to the auxiliary winding. In particular, the feedback circuit 60 may also derive the output signal at the output 50 from the auxiliary winding.
As shown in fig. 5 and 6, in one embodiment, the secondary winding 220 includes a plurality of secondary windings 220, and each secondary winding 220 is connected to one or more output switching circuits 40. Specifically, the plurality of outputs may be obtained through one secondary winding 220, or may be obtained through a plurality of different secondary windings 220, wherein the plurality of secondary windings 220 are coupled to the primary winding 210.
As shown in fig. 5, in an embodiment, the output switch circuit 40 includes a rectifier and a switch, a first end of the rectifier is connected to the secondary winding 220, a second end of the rectifier is connected to the first end of the switch, a second end of the switch is connected to the output terminal 50, and a control end of the switch is connected to the control circuit; specifically, the rectifier tube thereof realizes a reverse isolation function, and the switch controls the corresponding conduction connection of the secondary winding 220 and the output end 50.
As shown in fig. 6, in an embodiment, the output switch circuit 40 includes a bidirectional blocking switch, a first terminal of the bidirectional blocking switch is connected to the secondary winding 220, a second terminal of the bidirectional blocking switch is connected to the output terminal 50, and a control terminal of the bidirectional blocking switch is connected to the control circuit. Specifically, in an alternative to the above embodiment, the switch and the rectifier may be integrated, and a bidirectional blocking switch capable of bidirectional blocking is used to control the corresponding conductive connection between the secondary winding 220 and the output terminal 50.
As shown in fig. 10, in an embodiment, the feedback circuit 60 includes a current feedback circuit 62 and/or a voltage feedback circuit 61 respectively connected to the output terminal 50, and the voltage feedback signal of the output terminal 50 is obtained through the voltage feedback circuit 61, and the current feedback signal of the output terminal 50 is obtained through the current feedback circuit 62. The control can be carried out independently according to the voltage feedback signal or the current feedback signal, and can also be carried out simultaneously according to the voltage feedback signal and the current feedback signal.
In the above multi-output switching power supply, a specific control process of the control circuit controlling the input switching circuit 30 to turn on and off according to the feedback signal is shown in fig. 11, at an initial time t0, g _ Q1 goes high, the switching tube Q1 is turned on, and the transformer 20(Tx1) stores energy. The secondary winding 220(vs) signal is negative and the level is determined by the primary secondary turn ratio and the input voltage. The current Ipri of the switching tube Q1 increases, and the on-time of the switching tube Q1 is determined by the duty ratio corresponding to the control amount Vctl. After a time t1, the on time of the switch Q1 is over, and the switch Q1 is turned off. Tx1 releases energy to the output. In this cycle, the output select decision S1 is turned on, g _ S1 is high, and Tx1 energy is discharged to the first output Vout 1. At time t2, the stored energy of transformer 20 is fully discharged to first output terminal 50. Feedback circuit 60 takes the requirement for output energy of path 2, denoted Vctl 2. The output control logic selects a second path of control quantity Vctl2 through g _ sw and gives the second path of control quantity Vctl through an isolation optical coupler ISO 1. At time t3-t4, Q1 and Tx1 deliver the energy required by the second output to the second output according to the value of Vctl. And so on. In this process, the switching cycle counting unit gives the timing position at which each cycle is located. Output selection determines the timing of g _ s1, g _ s2, and g _ sw according to a control strategy.
As shown in fig. 12, another specific control process for controlling the input switch circuit 30 to turn on and off by the control circuit according to the feedback signal in the above multiple-output switching power supply assumes that the second output quantity is small and the first output quantity is large. The control circuit can change the output energy according to the difference of the output energy, and can also realize the adjustment of the energy through the time sequence control proportion in addition to controlling the duty ratio. The time sequence of the first path and the second path may be that every 2 first path conduction periods correspond to 1 second path conduction period. Correspondingly, the energy transferred to one output when one output switch circuit is switched on can be changed by increasing or decreasing the on/off period number of the input switch circuit when each output switch circuit is switched on. Compared to the simple complementary conduction scheme in fig. 11, the equivalent transformer 20 can provide 2 times the power to one of the paths. This timing based energy control can be dynamically determined according to output requirements.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A multiple output switching power supply, comprising: the transformer comprises a primary winding, a secondary winding, an input switch circuit, a voltage input end, N output switch circuits, a feedback circuit and a control circuit, wherein the input switch circuit and the voltage input end are connected with the primary winding;
the control circuit is used for generating a first control signal to control the output switch circuit to be conducted, and acquiring a feedback signal of the output end through the feedback circuit corresponding to the output switch circuit;
the control circuit is further configured to generate a second control signal to control the input switch circuit to be turned on or off when the output switch circuit is turned on.
2. The multiple-output switching power supply of claim 1,
the control circuit comprises a first control module and a second control module;
the first control module is used for generating a second control signal, and the second control module is used for generating a first control signal.
3. The multiple-output switching power supply of claim 2,
the control circuit further comprises an isolation module connected with the first control module and/or the second control module, a first isolation end of the isolation module and the primary winding are arranged in a common-ground mode, and a second isolation end of the isolation module and the secondary winding are arranged in a common-ground mode.
4. The multiple-output switching power supply of claim 3,
the isolation module comprises a photoelectric coupling module, a first end of a light emitting diode of the photoelectric coupling module is connected with the second control module, a second end of the light emitting diode of the photoelectric coupling module is grounded and is grounded with the second control module, a first end of a phototriode of the photoelectric coupling module is connected with the first control module, and a second end of the phototriode of the photoelectric coupling module is grounded and is grounded with the first control module; the first control module and the primary winding are arranged in a common-ground mode, and the second control module and the secondary winding are arranged in a common-ground mode; or
The isolation module comprises a first isolation coil, a first end and a second end of the first isolation coil are connected with the first control module, and a third end and a fourth end of the first isolation coil are connected with the input switch circuit; the first control module is connected with the second control module and is arranged in common with the secondary winding, and the second control module is connected with the output switch circuit; or
The isolation module comprises a second isolation coil, a first end and a second end of the second isolation coil are respectively connected with the second control module, a third end and a fourth end of the second isolation coil are connected with the output switch circuit, the second control module is connected with the first control module and is arranged in common with the primary winding, and the first control module is connected with the input switch circuit.
5. The multiple-output switching power supply of claim 4,
the first control module includes:
the first switch driving module is connected with the input switch circuit or connected with a first end and a second end of the first isolation coil;
the second control module includes:
a switch cycle counting module connected with the secondary winding or the input switch circuit and used for acquiring the current switch cycle sequence of the input switch circuit,
a switching module connected with the switching period counting module and used for acquiring the current switching period sequence of the input switching circuit and outputting a first switching signal and a second switching signal,
the second switch driving module is connected with the switching module and used for receiving the first switching signal to switch the output switch circuit to be conducted, wherein the second switch driving module is connected with the first end and the second end of the output switch circuit or the second isolation coil;
and the feedback switch circuit is respectively connected with the feedback circuit and the switching module and is used for receiving a second switching signal to switch the feedback circuit to be in conductive connection with the first control module.
6. The multiple-output switching power supply of claim 5,
the feedback circuit comprises an operational amplifier and a loop compensation module connected with the operational amplifier.
7. The multiple-output switching power supply of claim 6,
the feedback circuit further comprises an auxiliary winding coupled with the secondary winding, and one input end of the operational amplifier is connected with the auxiliary winding.
8. The multiple-output switching power supply according to claim 1, wherein the secondary winding comprises a plurality of secondary windings, each of the secondary windings being connected to one or more of the output switching circuits.
9. The multiple-output switching power supply of claim 1,
the output switch circuit comprises a rectifier tube and a change-over switch, wherein the first end of the rectifier tube is connected with the secondary winding, the second end of the rectifier tube is connected with the first end of the change-over switch, the second end of the change-over switch is connected with the output end, and the control end of the change-over switch is connected with the control circuit; or
The output switch circuit comprises a bidirectional blocking switch, the first end of the bidirectional blocking switch is connected with the secondary winding, the second end of the bidirectional blocking switch is connected with the output end, and the control end of the bidirectional blocking switch is connected with the control circuit.
10. The multiple-output switching power supply according to claim 1, wherein the feedback circuit comprises a current feedback circuit and/or a voltage feedback circuit respectively connected to the output terminals.
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Application publication date: 20200428 |