CN107546959A - A kind of Switching Power Supply, electronic equipment and Switching Power Supply control method - Google Patents

A kind of Switching Power Supply, electronic equipment and Switching Power Supply control method Download PDF

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Publication number
CN107546959A
CN107546959A CN201610465372.0A CN201610465372A CN107546959A CN 107546959 A CN107546959 A CN 107546959A CN 201610465372 A CN201610465372 A CN 201610465372A CN 107546959 A CN107546959 A CN 107546959A
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switch circuit
power supply
input
output
switching power
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CN107546959B (en
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王林国
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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

Abstract

The invention discloses a kind of Switching Power Supply, electronic equipment and Switching Power Supply control method, first switch circuit and second switch circuit including cascade, and the power output of Switching Power Supply is undertaken in a manner of power is shared jointly, simultaneously, the input voltage or output voltage of first switch circuit are adjusted by voltage control unit, so that the input voltage work of second switch circuit is within a preset range, and exported the output voltage of second switch circuit as the output voltage of Switching Power Supply, so as to improve the conversion efficiency of Switching Power Supply.

Description

A kind of Switching Power Supply, electronic equipment and Switching Power Supply control method
Technical field
The present invention relates to electronic technology field, more particularly to a kind of Switching Power Supply, electronic equipment and Switching Power Supply controlling party Method.
Background technology
Traditional switch power supply generally use PWM (Pulse Width Modulation, pulse width modulation) is controlled, and is such as schemed Buck circuits (Buck conversion circuit) shown in 1.But this traditional switch power supply dutycycle when input voltage range is wider Change greatly, conversion efficiency is relatively low, it is not easy to realize soft switch technique to reduce switching loss.
It is larger for traditional switch power supply change in duty cycle, the problem of conversion efficiency is relatively low, propose a kind of modified two level Switching Power Supply, following stage use the efficient configuration of fixed duty cycle, and prime output voltage is higher, and conversion efficiency is also corresponding higher, Secondary switch power supply as shown in Figure 2.But because the secondary structure is two-stage tandem structure, front stage is required to processing whole Power, influence power supply overall transformation efficiency.
The content of the invention
Switching Power Supply, electronic equipment and the Switching Power Supply control method provided according to embodiments of the present invention, mainly solve existing There is the relatively low technical problem of Switching Power Supply conversion efficiency.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of Switching Power Supply, including:
The first switch circuit of cascade and second switch circuit, and the shared Switching Power Supply in a manner of power contribution Power output;Also include voltage control unit, the logical input voltage to the first switch circuit of the voltage control unit or Output voltage is adjusted, to control the input voltage of the second switch circuit within a preset range, by the second switch The output voltage of circuit exports as the output voltage of Switching Power Supply.
The embodiment of the present invention additionally provides a kind of electronic equipment, including Switching Power Supply as described above.
The embodiment of the present invention additionally provides a kind of Switching Power Supply control method, including:
By first switch circuit and second switch circuits cascading, and make the first switch circuit and second switch circuit with The power output of the mode shared Switching Power Supply of power contribution;
Voltage control unit is by adjusting second described in the input voltage or output voltage control of the first switch circuit The input voltage of on-off circuit within a preset range, the output using the output voltage of the second switch circuit as Switching Power Supply Voltage output.
The beneficial effects of the invention are as follows:
Switching Power Supply, electronic equipment and the Switching Power Supply control method provided according to embodiments of the present invention, including cascade First switch circuit and second switch circuit, and the power output of Switching Power Supply is undertaken in a manner of power is shared jointly, meanwhile, The input voltage or output voltage of first switch circuit are adjusted by voltage control unit so that second switch circuit Input voltage works within a preset range, then that the output voltage of second switch circuit is defeated as the output voltage of Switching Power Supply Go out, so as to improve the conversion efficiency of Switching Power Supply.
Brief description of the drawings
Fig. 1 is traditional switch power supply architecture schematic diagram;
Fig. 2 is existing modified secondary switch power supply architecture schematic diagram;
Fig. 3 is the Switching Power Supply structural representation that the embodiment of the present invention one provides;
Fig. 4 is another Switching Power Supply structural representation that the embodiment of the present invention one provides;
Fig. 5 is the second switch electrical block diagram that the embodiment of the present invention two provides;
Fig. 6 is the isolation type switch power structural representation that the embodiment of the present invention two provides;
Fig. 7 is the non-isolation type Switching Power Supply structural representation that the embodiment of the present invention two provides;
Fig. 8 is another non-isolation type Switching Power Supply structural representation that the embodiment of the present invention two provides;
Fig. 9 is the isolation type switch power structural representation that the embodiment of the present invention three provides.
Embodiment
The embodiment of the present invention is described in further detail below by embodiment combination accompanying drawing.
Embodiment one
In order to solve the problems, such as that existing Switching Power Supply conversion efficiency is relatively low, the embodiments of the invention provide one kind switch electricity Source, electronic equipment and Switching Power Supply control method, the Switching Power Supply include the first switch circuit and second switch circuit of cascade, And the power output of Switching Power Supply is undertaken in a manner of power is shared jointly;Also include voltage control unit, voltage control unit It is adjusted by the input voltage to first switch circuit or output voltage, to control the input voltage of second switch circuit to exist In preset range, then exported the output voltage of second switch circuit as the output voltage of Switching Power Supply, so as to improve out The conversion efficiency in powered-down source.Wherein, preset range includes the higher input voltage range of conversion efficiency, optionally, preset range Using conversion efficiency highest input voltage range;Voltage control unit can use circuit model well known in the art to input electricity Pressure is controlled;Cascade refers to that two Switching Power Supplies connect in some way, and such as series, parallel, series connection combine with parallel.
Fig. 3 is referred to, Fig. 3 is the Switching Power Supply structural representation that the present embodiment provides.In figure, the Switching Power Supply includes the One on-off circuit 31, second switch circuit 32, input voltage control unit 33, input power and three electrochemical capacitors;First Connect an electrochemical capacitor between the both positive and negative polarity of the input of on-off circuit 31 to be used to filter, the input of second switch circuit 32 is just Connect an electrochemical capacitor between negative pole to be used to filter, first switch circuit 31 is electric with electrolysis with second switch circuit output 32 Appearance is connected to filter;The input of first switch circuit 31 is connected to Switching Power Supply after being connected with the input of second switch circuit 32 Input, be connected to Switching Power Supply after the output end of first switch circuit 31 is in parallel with the output end of second switch circuit 32 Output end;Meanwhile the input of input voltage control unit 33 is connected with the input cathode of first switch circuit 31, input voltage control The output end of unit 33 processed is connected with the switching tube (not shown) of first switch circuit 31, for first switch circuit 31 Input voltage is adjusted, and then controls the input voltage of second switch circuit 32 to be operated in the input voltage range of greater efficiency It is interior so that the final output voltage of second switch circuit 32 is desirable value.
First switch circuit 31 and second switch circuit 32 can use electric source topology well known in the art, such as buck, boost (boost conversion circuit), buckboost (buck translation circuit), normal shock, flyback, recommend, the circuit such as bridge-type.Further, Second switch circuit 32 also includes the efficient circuits that not voltage stabilizing or half voltage stabilizing control, wherein, the circuit of half structure of voltage regulation can limit Determine to realize the voltage stabilizing of output voltage in scope, the conversion efficiency of this scope interior power is higher, not the circuit dutycycle of structure of voltage regulation It is fixed, there is higher conversion efficiency.Further, first switch circuit 31 and second switch circuit 32 are isolated form electricity Road, then Switching Power Supply is isolated supplies, electric in input of the input voltage control unit 33 by adjusting first switch circuit 31 Pressure, in the case of controlling the input voltage of second switch circuit 32 to be operated in the input voltage range of greater efficiency, for Isolation type switch power, without passing through the isolating device fed-back output voltages such as optocoupler, fixing fabric structure and longevity to power supply from secondary Life all brings benefit.Meanwhile first switch circuit 31, series connection in parallel by multiple electric source topologies or can go here and there and be bonded, phase Answer, second switch circuit 32 by multiple electric source topology series, parallel or string and can be equally bonded.Opened for example, working as first When powered-down road 31 includes at least two electric source topologies, each electric source topology is in parallel;And/or second switch circuit 32 includes at least two During individual electric source topology, each electric source topology is in parallel.
Switching Power Supply shown in Fig. 3 is connected using first switch circuit 31 with the input of second switch circuit 32, output-parallel Framework so that less efficient first switch circuit 31 only assume responsibility for a part power, it is whole so as to improve Switching Power Supply The conversion efficiency of body.Simultaneously as first switch circuit 31 is controlled using input voltage feed forward, pass through input voltage control unit The input voltage of 33 control second switch circuits 32 so that the input voltage of second switch circuit 32 is operated in the defeated of greater efficiency Enter in voltage range.
Further, Fig. 4, another Switching Power Supply structural representation that Fig. 4 positions the present embodiment provides are referred to.In figure, open Powered-down source includes first switch circuit 41, second switch circuit 42, input power and three electrochemical capacitors, first switch circuit Connect an electrochemical capacitor between the both positive and negative polarity of 41 output ends to be used to filter, between the both positive and negative polarity of the input of second switch circuit 42 One electrochemical capacitor of connection is used to filter, and the input of first switch circuit 41 is electric with electrolysis with the output end of second switch circuit 42 Appearance is connected to filter;The input of first switch circuit 41 is connected to switch after being connected with the output end of second switch circuit 42 The output end of power supply, the output end of first switch circuit 41 are connected to switch electricity after being connected with the input of second switch circuit 42 The input in source.
In Switching Power Supply, two kinds of control modes be present to the input voltage of second switch circuit 42:
In a kind of control mode, before first switch circuit 41 is using input voltage (i.e. the output voltage of second switch circuit 42) It is desirable value that the mode of feedback, which directly controls the final output voltage of second switch circuit 42, meanwhile, for isolation type switch power, This control mode can be also avoided from secondary by isolating device fed-back output voltages such as optocouplers, fixing fabric structure and life-span to power supply All bring benefit.
In another control mode, first switch circuit 41 can apply traditional voltage regulation type on-off circuit, using the side of feedback The input voltage of formula control second switch circuit 42 is operated in the input voltage range of greater efficiency so that second switch circuit 42 output voltage is desirable value, namely the output end of first switch circuit 41 passes through the input string with second switch circuit 42 Connection, ensure that the input voltage of second switch circuit 42 is operated in the input voltage range of greater efficiency.
Specifically, for the first control mode, also include input voltage control unit 43 in Fig. 4, pass through input electricity Pressure control unit 43 realizes input voltage feed forward control.More specifically, the input of input voltage control unit 43 and first switch The input of circuit 41 connects, the output end of input voltage control unit 43 and the switching tube (not shown) of first switch circuit 41 Connection, for being adjusted to the input voltage of first switch circuit 41, and then control the input voltage of second switch circuit 42 It is operated in the input voltage range of greater efficiency so that the final output voltage of second switch circuit 42 is desirable value.It is foregoing Switching tube includes but is not limited to metal-oxide-semiconductor (metal oxide semiconductor, metal oxide semiconductor field effect transistor Pipe), other field-effect transistors can also be used.The embodiment of the present invention will be illustrated by taking metal-oxide-semiconductor as an example below.
For second of control mode, also include output voltage control unit 44 in Fig. 4, pass through the output voltage control list Member 44 realizes output voltage feedback control.More specifically, the input of output voltage control unit 44 and first switch circuit 41 are defeated Enter end connection, the output end of output voltage control unit 44 is connected with the switching tube (not shown) of first switch circuit 41, is used Be adjusted in the output voltage to first switch circuit 41, so control second switch circuit 42 input voltage be operated in compared with In efficient input voltage range so that the input voltage of second switch circuit 42 is within a preset range.
Further, first switch circuit 41 needs progress dual quadrant (bidirectional) to work in Fig. 4, i.e., and first The output voltage and output current of on-off circuit 41 can be reverse, and power supply energy can be from input and the two-way biography of output end Pass.Under this connected mode, it is ensured that energy still transmits from the end of input power 44 (left side) to load end (right side).In field often In the electric source topology seen, it can realize that dual quadrant works using circuit of synchronous rectification, such as synchronous buck, boost and various synchronizations are whole The bridge circuit of stream.Second switch circuit 42 can use electric source topology well known in the art, as buck, boost, buckboost, Normal shock, flyback, recommend, the circuit such as bridge-type, can also use the efficient circuits of half voltage stabilizing or unstable voltage-controlled system.Meanwhile first switch Circuit 41, series connection in parallel by multiple electric source topologies or can go here and there and be bonded, and accordingly, second switch circuit 42 equally can be by Multiple electric source topology series, parallel or string are simultaneously bonded, for example, when first switch circuit 41 includes at least two electric source topologies When, each electric source topology is in parallel;And/or second switch circuit 42, when including at least two electric source topologies, each electric source topology is in parallel. Further, when Switching Power Supply is isolated supplies, by the feed-forward control manner of input voltage control unit 43, equally may be used Avoid using isolating devices such as optocouplers, so as to increase Switching Power Supply volume, reduce service life.
In addition, the present embodiment additionally provides a kind of electronic equipment, including foregoing Switching Power Supply.
The Switching Power Supply that the present embodiment provides, by first switch circuit and the second switch circuits cascading of cascade, with work( The mode that rate is shared undertakes the power output of Switching Power Supply, relatively inefficient first switch circuit is only undertaken very little part Power output, so as to improve the conversion efficiency of whole Switching Power Supply.Meanwhile by voltage control unit to first switch The voltage of circuit is controlled so that and the input voltage of second switch circuit is operated in the input voltage range of greater efficiency, It is desirable value so as to control the output voltage of second switch circuit, the efficiency of further lifting switch power supply.Meanwhile for every Release Switching Power Supply, without passing through the isolating device fed-back output voltages such as optocoupler, fixing fabric structure and life-span to power supply from secondary All bring benefit.
Embodiment two
Based on the Switching Power Supply of embodiment one, the present embodiment is based on the Switching Power Supply shown in Fig. 3, using physical circuit Structure explains to the embodiment of the present invention, namely is connected with first switch circuit with the input of second switch circuit, output-parallel Connected mode the embodiment of the present invention is illustrated, it is specific as follows:
Fig. 5 is referred to, Fig. 5 is the second switch electrical block diagram that the present embodiment provides, and second switch circuit is this Well known LLC resonance circuits in field, the LLC resonance circuits include resonant inductance 51, resonant capacitance 52, magnetizing inductance 53, change Depressor 54, electric capacity, two metal-oxide-semiconductors (namely switching tube 55) of the primary side of transformer 54, the secondary of transformer 54 two metal-oxide-semiconductors and Diode on two metal-oxide-semiconductors.Wherein, resonant inductance 51 and resonant capacitance 52 are connected, exciting capacity 53 and the primary side of transformer 54 Parallel connection, resonant capacitance 52 are connected with the Same Name of Ends of transformer 54, switching tube 55 be connected on Switching Power Supply input both positive and negative polarity it Between, the input of resonant inductance 51 is connected with upper metal-oxide-semiconductor output end in switching tube 55;The secondary both ends of transformer 54 connect one respectively Metal-oxide-semiconductor, between the drain electrode of two metal-oxide-semiconductors and source electrode respectively a diode in parallel to prevent metal-oxide-semiconductor reverse breakdown;Two The drain series of metal-oxide-semiconductor are simultaneously connected with the positive pole of electric capacity, and the negative pole of electric capacity is connected to the of the same name of the next coil of the secondary of transformer 54 Hold and be connected with switched power output.
In LLC resonance circuits, when switching frequency operation is in the resonant frequency formed by resonant inductance Lr and resonant capacitance Cr During point, the Sofe Switch of transformer primary side and secondary side rectification circuit can be realized, switching loss can minimize, and voltage and current Synchronous waveform, the efficiency of transmission highest of energy, therefore very high power supply conversion efficiency can be realized.Simultaneous Switching frequency can accomplish Very high, the power density of power supply is effectively lifted.LLC resonance circuits peak efficiency realizes in resonance point, now resonance circuit Gain is that the input and output voltage ratio of 1, LLC resonance circuits is the former secondary turn ratio N of transformer:1.In input voltage range When wider, the switching frequency of LLC resonance circuits needs to change in the larger context, so that LLC resonance circuits reach needs Gain, now original edge voltage do not resynchronize, efficiency of energy delivery is relatively low (power factor (PF)), energy feedback phenomenon, electric current RMS be present (root meam square, root-mean-square value) is higher, causes conduction loss to increase, and efficiency reduces.
Further, Fig. 6, the isolation type switch power structural representation that Fig. 6 provides for the present embodiment, the isolation are referred to Type structure includes first switch circuit 61, second switch circuit 62, input voltage control unit 63 and three electrochemical capacitors, Wherein, second switch circuit 62 is represented, for the LLC resonance circuits with transformer in figure 6 using LLC resonance circuits in Fig. 5 Structure, refer to the correlation analysis in Fig. 4, repeat no more here.First switch circuit 61 is using well known flyback in field Formula isolation circuit, the isolation circuit include transformer, a metal-oxide-semiconductor of transformer primary side, a metal-oxide-semiconductor of transformer secondary And the diode connected on the metal-oxide-semiconductor;Transformer primary side non-same polarity connects the drain electrode of metal-oxide-semiconductor, the metal-oxide-semiconductor grid with it is defeated Enter voltage control unit 63 to connect, metal-oxide-semiconductor source electrode is connected with an electrochemical capacitor negative pole, and the electrochemical capacitor is connected in parallel on transformer primary The input of Switching Power Supply is connected to behind side, the input of input voltage control unit 63 is connected with the electrochemical capacitor negative pole;Transformation Device secondary Same Name of Ends connects with the drain electrode of another metal-oxide-semiconductor, and parallel diode is anti-to prevent metal-oxide-semiconductor between metal-oxide-semiconductor drain electrode and source electrode To breakdown.The input of second switch circuit 62 is connected to the input of Switching Power Supply after being connected with the input of first switch circuit 61 End, is connected to another electrochemical capacitor, the electrolysis after the output end of second switch circuit 62 is in parallel with the output end of first switch circuit 61 The output end of electric capacity and Switching Power Supply connects, and the input of second switch circuit 62 connects with the input of input voltage control unit 63 Connect.
In above-mentioned isolated form structure, inverse-excitation type isolation circuit controls LLC resonance by the control mode of input voltage feed forward The input voltage of circuit is N*Vo, and wherein Vo is desired whole electric power output voltage, and N is the input and output of LLC resonance circuits Voltage gain, as described above when this LLC resonance circuit is operated in resonance point, N is the former vice-side winding turn ratio of transformer N:1.Now LLC resonance circuits can be operated in best efficiency point, and part of the input voltage vin more than N*Vo is by the defeated of circuit of reversed excitation Enter voltage-regulation.Specific control method includes:When input LLC resonance circuits input voltage is higher than N*Vo, inverse-excitation type isolation electricity Road reduces dutycycle, and then reduces power output, the increase of LLC resonance circuit parts power output, input capacitance electric discharge, input electricity Drops.
Because the input of inverse-excitation type isolation circuit and LLC resonance circuits is cascaded structure, its input current is phase during stable state Deng, so its input power is directly proportional to respective input voltage, when Vin and N*Vo are close, inverse-excitation type isolation circuit Input voltage is much smaller than LLC resonance circuits, i.e., less efficient inverse-excitation type isolation circuit is merely responsible for the power of sub-fraction, entirely The most of LLC resonance circuits by being operated in best efficiency point of the power output of power supply provide, therefore turn that Switching Power Supply is overall Larger raising can be obtained by changing efficiency.In addition, LLC resonance circuits can realize former secondary Sofe Switch in resonance point work, raising is opened Frequency is closed, reduces passive device volume, improving power density has larger help, and present embodiment is adopted to inverse-excitation type isolation circuit With the control mode of input voltage feed forward, the isolators such as required optocoupler are fed back without traditional inverse-excitation type isolation circuit output voltage Part, it can further improve the power density of overall power supply.
Further, Fig. 7 is referred to, the non-isolation type Switching Power Supply structural representation that Fig. 7 positions the present embodiment provides, this is non- Isolated form circuit includes first switch circuit 71, second switch circuit 72, input voltage control unit 73 and three electrolysis electricity Hold;Wherein, second switch circuit 72 uses the LLC resonance circuit consistent with Fig. 4, is represented in Fig. 7 similar to Fig. 6 with transformer, For the structure of the circuit, the analysis in Fig. 4 is referred to, is repeated no more here.First switch circuit 71 uses non-isolation type Buck circuits, non-isolation type buck circuits include two metal-oxide-semiconductors (i.e. switching tube 711) and inductance 712, a metal-oxide-semiconductor source Pole connects with the drain electrode of another metal-oxide-semiconductor, and is connected to the positive pole of inductance 712.It is in parallel between the input both positive and negative polarity of second switch circuit 72 One electrochemical capacitor is filtered, and another electrochemical capacitor in parallel is filtered between the input both positive and negative polarity of first switch circuit 71, First switch circuit input end is connected to the input of Switching Power Supply, input voltage control after being connected with second switch circuit input end The input of unit 73 processed is connected with the electrochemical capacitor positive pole, is connected with the input of second switch circuit 72, and input voltage control is single First 73 output ends are connected with two metal-oxide-semiconductor grids, and a metal-oxide-semiconductor drain electrode is connected with input voltage control unit 73, first switch The output end of circuit 71 is in parallel with the output end of second switch circuit 72 and is connected to another electrochemical capacitor, and the electrochemical capacitor is connected to out The output end in powered-down source.
Due to the input and output isolation characteristic that non-isolation type buck circuits are not brought including transformer, its input voltage negative terminal Need to be grounded, LLC resonance circuits have isolation characteristic, the anode connection input power Vin of its input voltage anode.It is non-isolated Type buck circuits use input voltage feed forward mode, and it is Vin-N*Vo to control its input voltage, wherein, Vo is desired whole electricity Source output voltage.Now the input voltage of LLC resonance circuits is N*Vo, and wherein N is that the input and output voltage of LLC resonance circuits increases Benefit.Specific control mode is, when the input voltage of non-isolation type buck circuits is higher, increases dutycycle, non-isolation type Buck circuits transmit energy increase, the electric discharge of its electrochemical capacitor, and input voltage reduces.
Further, Fig. 8 is referred to, another non-isolation type Switching Power Supply structural representation that Fig. 8 positions the present embodiment provides, The non-isolation type Switching Power Supply includes first switch circuit 81, second switch circuit 82, input voltage control unit 83 and three Individual electrochemical capacitor.Wherein, second switch circuit 82 is opened using efficient non-isolated circuit, half die mould of N=2 as illustrated Powered-down capacitive circuit, this circuit can realize efficient Vo=1/2Vin non-isolated conversion, and Vo is desired whole power supply output electricity Pressure, coordinate the first switch circuit 81 of isolation, form Fig. 8 non-isolation type Switching Power Supply.First switch circuit 81 is using in Fig. 6 The circuit structure of first switch circuit 61, i.e., repeated no more, please join here using inverse-excitation type isolation circuit, its particular circuit configurations See Fig. 6 descriptions as described in inverse-excitation type isolation circuit.The input string of the input of first switch circuit 81 and second switch circuit 82 The input of Switching Power Supply, the input of input voltage control unit 83 and the input cathode of first switch circuit 81 are connected to after connection Connection, output end are connected with metal-oxide-semiconductor (i.e. switching tube) grid in first switch circuit 81, and the input of first switch circuit 81 is rectified An electrochemical capacitor in parallel between negative pole, another electrochemical capacitor in parallel between the input both positive and negative polarity of second switch circuit 82, first On-off circuit 81 is in parallel with the output end of second switch circuit 82 and is connected to another electrochemical capacitor, and the electrochemical capacitor is connected to out The output end in powered-down source.It is similar with Fig. 6 for the control mode of the non-isolation type Switching Power Supply in Fig. 8, therefore repeat no more here.
Pass through the present embodiment provide each circuit diagram, the framework of Switching Power Supply input series and output parallel so that efficiency compared with Low first switch circuit only undertakes the power of a part so that and the conversion efficiency of whole Switching Power Supply is higher, meanwhile, by defeated Enter adjustment of the voltage control unit to first switch circuit input voltage so that the input voltage of second switch circuit be operated in compared with In efficient input voltage range, the conversion efficiency of power supply is further improved.In addition, for isolation type switch power, Using input control circuit feed-forward mode, without passing through the isolating device fed-back output voltages such as optocoupler from secondary, to power volume Control and life-span are all beneficial.
Embodiment three
Based on the Switching Power Supply of embodiment one, the present embodiment is based on the Switching Power Supply shown in Fig. 4, using physical circuit Structure explains to the embodiment of the present invention, namely is connected with first switch circuit output end with second switch circuit input end, First switch circuit input end is connected with second switch circuit output end, specific as follows:
Fig. 9 is referred to, Fig. 9 is the isolation type switch power structural representation that the present embodiment provides, and isolated form switch is electric Source includes first switch circuit 91, second switch circuit 92, input voltage control unit 93 and three electrochemical capacitors.Wherein, Second switch circuit 92 is made up of foregoing LLC resonance circuits, is represented in figure with transformer, for the structure of LLC resonance circuits, this In repeat no more.First switch circuit 91 uses conventional full bridge circuit of synchronous rectification, and the full-bridge synchronous rectification circuit includes transformation Device, inductance, two metal-oxide-semiconductors of transformer secondary and four metal-oxide-semiconductors of diode, transformer primary side and four on two metal-oxide-semiconductors On individual metal-oxide-semiconductor diode (i.e. in Fig. 9 the transformer left side be secondary, the right be primary side), it is in parallel between transformer primary side both ends Four metal-oxide-semiconductors, wherein, the drain electrode of two metal-oxide-semiconductors is connected with transformer primary side Same Name of Ends, the source electrodes of two metal-oxide-semiconductors with change Depressor primary side non-same polarity connects;A metal-oxide-semiconductor source electrode in the first two metal-oxide-semiconductor leaks with a metal-oxide-semiconductor in latter two metal-oxide-semiconductor Pole connects, and another metal-oxide-semiconductor source electrode in the first two metal-oxide-semiconductor connects with another metal-oxide-semiconductor drain electrode in latter two metal-oxide-semiconductor;Become The non-same polarity of a coil is connected with the drain electrode of a metal-oxide-semiconductor on depressor secondary, the non-same polarity of the next coil of transformer secondary It is connected with the drain electrode of another metal-oxide-semiconductor;Two poles in parallel are distinguished between the drain electrode of two metal-oxide-semiconductors of transformer secondary and source electrode To prevent metal-oxide-semiconductor reverse breakdown, the source electrode of two metal-oxide-semiconductors connects pipe;Inductance negative pole and transformer secondary up and down two coils it Between connect, positive pole is connected with input power.The input of input voltage control unit 93 is in parallel with the input of first switch circuit 91, Connected with the output end of second switch circuit 92, the output end of input voltage control unit 93 and the transformer primary of first switch circuit 91 Four metal-oxide-semiconductors connection of side connection, the output end of first switch circuit 91 are connected to after being connected with the input of second switch circuit 92 The input of Switching Power Supply, the output end of second switch circuit 92 are connected with the input of first switch circuit 91 and are connected to an electricity Solve electric capacity, the output end connection of the electrochemical capacitor and Switching Power Supply, and the parallel connection between the output head anode of first switch circuit 91 Another electrochemical capacitor, another electrochemical capacitor in parallel between the output positive and negative charge of second switch circuit 92.
In isolation type switch power in Fig. 9, the output of LLC resonance circuits is that final switch power source output voltage connection is complete The primary side input of bridge circuit of synchronous rectification, the secondary output end of full-bridge synchronous rectification circuit and the input of LLC resonance circuits Input power Vin is connected to after series connection.The secondary of full-bridge synchronous rectification circuit uses the circuit of synchronous rectification of metal-oxide-semiconductor composition, can Ensure the two-way flow of electric current.Using input voltage, (i.e. the output voltage Vo, Vo of second switch circuit are to think to first switch circuit The whole electric power output voltage wanted) feedforward mode, it is desirable value to control Vo.Specifically control mode is:When Vo is higher than desirable value When, first switch circuit increase dutycycle, transmission of the energization from primary side to secondary, the output voltage increasing of first switch circuit Add so that the input voltage of second switch circuit reduces, and then reduces the output voltage Vo of second switch circuit, obtains switch electricity The final output voltage desirable value in source.
The Switching Power Supply that the present embodiment provides, by the way of input voltage feed forward, control the input of second switch circuit Voltage power supply is in the input voltage range of greater efficiency, so as to the conversion efficiency that lifting switch power supply is overall, meanwhile, using every Release Switching Power Supply, under the control mode of input voltage feed forward, it can also avoid using the isolating devices such as optocoupler increase switch electricity The volume in source, reduce service life.
Example IV
The present embodiment is based on embodiment one, there is provided a kind of Switching Power Supply control method, the control method and embodiment The switching power unit of offer is corresponding, therefore the present embodiment elaborates no longer split powered-down source structure.What this implementation provided Switching Power Supply control method includes:
By first switch circuit and second switch circuits cascading, and make first switch circuit with second switch circuit with power The power output for the mode shared Switching Power Supply shared;
Voltage control unit is by adjusting the input voltage or output voltage control second switch circuit of first switch circuit Input voltage within a preset range, using the output voltage of second switch circuit as Switching Power Supply output voltage export.
In a kind of embodiment, by the input of first switch circuit with being connected after the output end series connection of second switch circuit To the output end of Switching Power Supply, it is connected to out after the output end of first switch circuit is connected with the input of second switch circuit The input in powered-down source, the output end of the input of voltage control unit and Switching Power Supply is connected, by voltage control unit Output end is connected with the switching tube of first switch circuit, wherein, first switch circuit includes circuit of synchronous rectification;For the switch Power supply architecture, the control mode of following Switching Power Supply can be used:
Voltage control unit controls the input voltage of second switch circuit by adjusting the input voltage of first switch circuit Within a preset range, exported the output voltage of second switch circuit as the output voltage of Switching Power Supply.
In a kind of embodiment, by the input of first switch circuit with being connected after the output end series connection of second switch circuit To the output end of Switching Power Supply, it is connected to out after the output end of first switch circuit is connected with the input of second switch circuit The input in powered-down source, the input of voltage control unit and the input of Switching Power Supply are connected, by voltage control unit Output end is connected with the switching tube of first switch circuit, wherein, first switch circuit includes circuit of synchronous rectification;For the switch Power supply architecture, the control mode of following Switching Power Supply can be used:
Voltage control unit is by adjusting the input voltage of the output voltage control second switch circuit of first switch circuit Within a preset range, exported the output voltage of second switch circuit as the output voltage of Switching Power Supply.
In another way of example, after the input of first switch circuit is connected with the input of second switch circuit The input of Switching Power Supply is connected to, by the output end of first switch circuit with being connected after the output end parallel connection of second switch circuit To the output end of Switching Power Supply, the input of voltage control unit and the input of Switching Power Supply are connected, voltage controlled single The output end of member is connected with the switching tube of first switch circuit;For the Switching Power Supply structure, following Switching Power Supply control can be used Mode processed, it is specific as follows:
Voltage control unit controls the input voltage of second switch circuit by adjusting the input voltage of first switch circuit Within a preset range, exported the output voltage of second switch circuit as the output voltage of Switching Power Supply.
Foregoing preset range includes the higher input voltage range of conversion efficiency, and optionally, preset range is imitated using conversion Rate highest input voltage range;Aforesaid voltage control unit can use circuit model well known in the art to carry out input voltage Control;It is foregoing cascade refer to two Switching Power Supplies input, output connect in some way, such as series, parallel, series connection with simultaneously It is coupled conjunction etc..
Further, first switch circuit and second switch circuit can use electric source topology well known in the art, such as Buck, boost, buckboost, normal shock, flyback, recommend, the circuit such as bridge-type.Second switch circuit can also use not voltage stabilizing or half The efficient circuits of voltage stabilizing control, wherein, the circuit of half structure of voltage regulation can realize the voltage stabilizing of output voltage, this model in the range of restriction Enclose that the conversion efficiency of interior power is higher, the circuit dutycycle of structure of voltage regulation is not fixed, and has higher conversion efficiency.
When first switch circuit and second switch circuit are isolated form circuit, Switching Power Supply is isolated form switch electricity Source;In input voltage control unit by adjusting the input voltage of first switch circuit, to control the input of second switch circuit In the case that voltage power supply is in the input voltage range of greater efficiency, for isolation type switch power, without passing through from secondary The isolating device fed-back output voltage such as optocoupler, benefit is all brought to the fixing fabric structure and life-span of power supply.
In addition, when first switch circuit uses input voltage feed forward control mode, pass through input voltage control unit control The input voltage of first switch circuit processed so that the input voltage of second switch circuit is operated in the input voltage model of greater efficiency In enclosing, so as to lift the conversion efficiency of whole Switching Power Supply.Meanwhile when first switch circuit is using output voltage feedback control mode When, pass through the output voltage of output voltage control unit control first switch circuit so that the input voltage of second switch circuit It is operated in the input voltage range of greater efficiency, so as to lift the conversion efficiency of whole Switching Power Supply.
The Switching Power Supply control method provided by the present embodiment, effectively controls second by way of feedovering or feeding back The input voltage of on-off circuit is operated in the input voltage range of greater efficiency so that the final output voltage of Switching Power Supply is Desirable value, so as to improve the conversion efficiency of Switching Power Supply.
Above content is to combine the further description that specific embodiment is made to the embodiment of the present invention, it is impossible to is recognized The specific implementation of the fixed present invention is confined to these explanations.For general technical staff of the technical field of the invention, Without departing from the inventive concept of the premise, some simple deduction or replace can also be made, should all be considered as belonging to the present invention Protection domain.

Claims (10)

  1. A kind of 1. Switching Power Supply, it is characterised in that including:The first switch circuit of cascade and second switch circuit, and with power The power output for the mode shared Switching Power Supply shared;Also include voltage control unit, the voltage control unit passes through The input voltage or output voltage of the first switch circuit are adjusted, to control the input of the second switch circuit electric Pressure within a preset range, exports the output voltage of the second switch circuit as the output voltage of Switching Power Supply.
  2. 2. Switching Power Supply as claimed in claim 1, it is characterised in that the input of the first switch circuit and described second It is connected to the input of Switching Power Supply after the input series connection of on-off circuit, the output end of the first switch circuit and described the The output end of Switching Power Supply is connected to after the output end parallel connection of two on-off circuits;The voltage control unit includes input voltage control Unit processed, the input voltage control unit to the input voltage of the first switch circuit by being adjusted, to control The input voltage of second switch circuit is stated within a preset range, using the output voltage of the second switch circuit as Switching Power Supply Output voltage output.
  3. 3. Switching Power Supply as claimed in claim 1, it is characterised in that the input of the first switch circuit and described second It is connected to the output end of Switching Power Supply after the output end series connection of on-off circuit, the output end of the first switch circuit and described the The input of Switching Power Supply is connected to after the input series connection of two on-off circuits;The voltage control unit includes input voltage control Unit processed, the input voltage control unit to the input voltage of the first switch circuit by being adjusted, to control The input voltage of second switch circuit is stated within a preset range, using the output voltage of the second switch circuit as Switching Power Supply Output voltage output;The first switch circuit includes circuit of synchronous rectification.
  4. 4. Switching Power Supply as claimed in claim 1, it is characterised in that the input of the first switch circuit and described second It is connected to the output end of Switching Power Supply after the output end series connection of on-off circuit, the output end of the first switch circuit and described the The input of Switching Power Supply is connected to after the input series connection of two on-off circuits;The voltage control unit includes output voltage control Unit processed, the output voltage control unit to the output voltage of the first switch circuit by being adjusted, to control The input voltage of second switch circuit is stated within a preset range, using the output voltage of the second switch circuit as Switching Power Supply Output voltage output;The first switch circuit includes circuit of synchronous rectification.
  5. 5. the Switching Power Supply as described in claim any one of 1-4, it is characterised in that the first switch circuit and second switch Circuit includes at least one electric source topology respectively;When the first switch circuit and second switch circuit include at least two respectively During electric source topology, each electric source topology in the first switch circuit is in parallel, each electric source topology in the second switch circuit It is in parallel.
  6. 6. a kind of electronic equipment, it is characterised in that including the Switching Power Supply as described in claim any one of 1-5.
  7. 7. a kind of Switching Power Supply control method, including:
    By first switch circuit and second switch circuits cascading, and make the first switch circuit with second switch circuit with power The power output for the mode shared Switching Power Supply shared;
    Voltage control unit is by adjusting second switch described in the input voltage or output voltage control of the first switch circuit The input voltage of circuit within a preset range, the output voltage using the output voltage of the second switch circuit as Switching Power Supply Output.
  8. 8. Switching Power Supply control method as claimed in claim 7, it is characterised in that methods described includes:
    Switching Power Supply is connected to after the input of the first switch circuit is connected with the input of the second switch circuit Input, by the output end of the first switch circuit it is in parallel with the output end of the second switch circuit after be connected to switch The output end of power supply, the input of the voltage control unit and the input of Switching Power Supply are connected, by voltage control unit Output end be connected with the switching tube of first switch circuit;
    Voltage control unit controls the input of the second switch circuit by adjusting the input voltage of the first switch circuit Voltage within a preset range, exports the output voltage of the second switch circuit as the output voltage of Switching Power Supply.
  9. 9. Switching Power Supply control method as claimed in claim 7, it is characterised in that methods described includes:
    Switching Power Supply is connected to after the input of the first switch circuit is connected with the output end of the second switch circuit Output end, by the output end of the first switch circuit it is in parallel with the input of the second switch circuit after be connected to switch The input of power supply, the output end of the input of the voltage control unit and Switching Power Supply is connected, by voltage control unit Output end be connected with the switching tube of first switch circuit;
    Voltage control unit controls the input of the second switch circuit by adjusting the input voltage of the first switch circuit Voltage within a preset range, exports the output voltage of the second switch circuit as the output voltage of Switching Power Supply.
  10. 10. Switching Power Supply control method as claimed in claim 7, it is characterised in that methods described includes:
    Switching Power Supply is connected to after the input of the first switch circuit is connected with the output end of the second switch circuit Output end, by the output end of the first switch circuit it is in parallel with the input of the second switch circuit after be connected to switch The input of power supply, the input of the voltage control unit and the input of Switching Power Supply are connected, by voltage control unit Output end be connected with the switching tube of first switch circuit;
    Voltage control unit is by adjusting the input of second switch circuit described in the output voltage control of the first switch circuit Voltage within a preset range, exports the output voltage of the second switch circuit as the output voltage of Switching Power Supply.
CN201610465372.0A 2016-06-23 2016-06-23 Switching power supply, electronic equipment and switching power supply control method Active CN107546959B (en)

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