CN106655823A - Anti-magnetic interference switching power supply and control circuit and control method thereof - Google Patents
Anti-magnetic interference switching power supply and control circuit and control method thereof Download PDFInfo
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- CN106655823A CN106655823A CN201610953347.7A CN201610953347A CN106655823A CN 106655823 A CN106655823 A CN 106655823A CN 201610953347 A CN201610953347 A CN 201610953347A CN 106655823 A CN106655823 A CN 106655823A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005291 magnetic effect Effects 0.000 claims abstract description 164
- 238000001514 detection method Methods 0.000 claims abstract description 110
- 230000004044 response Effects 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 claims description 34
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 14
- 230000005292 diamagnetic effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 7
- 230000000052 comparative effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 16
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 239000004065 semiconductor Substances 0.000 description 2
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
Disclosed are a switching power supply, and a control circuit and a control method thereof. The control circuit comprises an error amplifying unit for providing an error amplifying signal according to the output voltage of the switching power supply, a magnetic field detecting unit for judging whether the switching power supply is influenced by an external magnetic field and providing a magnetic field detection signal, a frequency control unit for providing a clock signal according to the magnetic field detection signal, and a switching control unit for providing a switching control signal to control a main power switch in the switching power supply, wherein the switching control unit controls the duty ratio of the main power switch in response to the error amplifying signal and controls the switching frequency of the main power switch in response to the clock signal. Compared with the prior art, the controllable switching frequency is realized, meanwhile, the interference of an external magnetic field to the switching power supply can be eliminated or weakened, and the controllable switching frequency has a simpler structure and lower cost.
Description
Technical field
Embodiments of the invention are related to a kind of electronic circuit, more specifically, more particularly to a kind of Switching Power Supply.
Background technology
Switching Power Supply has the advantages that faster transient response, relatively low loss have been widely used in each field due to it
In.However, when the fields such as ammeter are applied to, the problem that there may exist strong external magnetic field interference will be faced.It is a kind of existing
Solution is to increase mechanical masking shell, and to shield interference of the strong external magnetic field to Switching Power Supply, the shortcoming of this kind of method is
Increased cost and volume.Another kind of existing solution is, when designing the magnetic element in Switching Power Supply, for example, designs electricity
When sense or transformer, very big surplus is left, this kind of method will cause the magnetics volume in Switching Power Supply very huge
Greatly, while also increasing cost.
The content of the invention
To solve above-mentioned technical problem, the present invention provides a kind of Switching Power Supply and its control circuit and control method.
A kind of control circuit for Switching Power Supply according to embodiments of the present invention, the Switching Power Supply includes magnetic unit
The output end of part, the master power switch for being coupled to magnetic element, the input port of receives input voltage and offer output voltage
Mouthful, the control circuit includes：Error amplifying unit, with first input end, the second input and output end, wherein first is defeated
Enter end and receive reference signal, the second input receives the voltage feedback signal for representing output voltage, the error amplifying unit root
According to the difference between reference signal and voltage feedback signal, in output end error amplification signal is provided；Magnetic field detection unit, has
Whether output end, the magnetic field detection unit judges Switching Power Supply is affected by external magnetic field, and provides magnetic in its output end
Field detection signal；Frequency control unit, with first input end, the second input, the 3rd input and output end, wherein first
Input is coupled to the output end of magnetic field detection unit to receive magnetic field detection signal, and the second input receives frequency arranges electricity
Pressure, the 3rd input receives frequency adjustment voltage, the frequency control unit according to magnetic field detection signal, set of frequency voltage,
And frequency adjustment voltage provides clock signal in its output end, when magnetic field detection direction switch signal power supply is not affected by outside magnetic
During the impact of field, frequency control unit is equal to a predetermined frequency value according to the frequency of set of frequency voltage-control clock signal, when
When magnetic field detection direction switch signal power supply receives the impact of external magnetic field, frequency control unit according to set of frequency voltage and
The frequency of frequency adjustment voltage-control clock signal is equal to N times of the predetermined frequency value, and N is the integer more than 1；And switch
Control unit, with first input end, the second input and output end, wherein first input end is coupled to error amplifying unit
Output end, the second input is coupled to the output end of frequency control unit to receive clock signal, and the switch control unit exists
Its output end provides switch controlling signal to control the conducting and shut-off of master power switch, and wherein switch control unit is in response to by mistake
Difference amplifies the dutycycle that signal controls master power switch, and in response to clock signal the switching frequency of master power switch is controlled.
A kind of Switching Power Supply according to embodiments of the present invention, including：Transformer, with armature winding and secondary windings, its
Middle armature winding receives input voltage；Master power switch, is coupled to armature winding；Rectification circuit, is coupled to secondary windings and carries
For output voltage；Feedback circuit, there is provided represent the voltage feedback signal of output voltage；And control circuit, receiving voltage feedback
Signal, and provide switch controlling signal to control the conducting and shut-off of master power switch, the control according to voltage feedback signal
Whether circuit in response to voltage feedback signal to control the dutycycle of master power switch, according to Switching Power Supply receive by the control circuit
To the switching frequency of the impact control master power switch of external magnetic field, wherein when Switching Power Supply is not affected by the impact of external magnetic field
When, the switching frequency for controlling master power switch is equal to predetermined frequency value, and when Switching Power Supply is affected by external magnetic field,
The switching frequency of control master power switch is equal to N times of the predetermined frequency value, and N is the integer more than 1.
A kind of control method for Switching Power Supply according to embodiments of the present invention, the Switching Power Supply includes magnetic unit
The output end of part, the master power switch for being coupled to magnetic element, the input port of receives input voltage and offer output voltage
Mouthful, the control method includes：Voltage feedback signal is provided according to output voltage；According to reference signal and voltage feedback signal it
Between difference provide error amplification signal；According to error amplification signal, the dutycycle of master power switch is controlled；And judge to switch
Whether power supply is affected by external magnetic field；Wherein when Switching Power Supply is not affected by the impact of external magnetic field, Switching Power Supply is in
Normal mode of operation, controlling switch frequency is equal to first frequency preset value；And when Switching Power Supply is affected by external magnetic field,
Switching Power Supply enters diamagnetic pattern, and controlling switch frequency is equal to second frequency preset value, and wherein second frequency preset value is more than the
One predetermined frequency value.
Switching Power Supply according to embodiments of the present invention, while realizing that switching frequency is controllable, can eliminate or weaken outer
Interference of the portion magnetic field to Switching Power Supply, with better simply structure and relatively low cost.
Description of the drawings
In order to be better understood from the present invention, will be described the present invention according to the following drawings：
Fig. 1 shows the circuit block diagram of Switching Power Supply according to an embodiment of the invention 100；
Fig. 2 shows the circuit block diagram of Switching Power Supply according to an embodiment of the invention 200；
Fig. 3 shows that Switching Power Supply 200 shown in Fig. 2 according to an embodiment of the invention is adjusted according to error amplification signal COMP
The schematic diagram of whole switching frequency Fs；
Fig. 4 shows the circuit structure diagram of magnetic field detection unit 32 according to an embodiment of the invention；
Fig. 5 shows that Switching Power Supply 200 is according to the oblique of current detection signal CS shown in Fig. 2 according to an embodiment of the invention
Rate Rcs adjusts the schematic diagram of switching frequency Fs；
Fig. 6 shows the circuit structure diagram of magnetic field detection unit 32 according to another embodiment of the present invention；
Fig. 7 shows the circuit structure diagram of frequency control unit according to an embodiment of the invention 33；
Fig. 8 shows the control method flow chart for Switching Power Supply according to an embodiment of the invention.
Specific embodiment
The specific embodiment of the present invention is described more fully below, it should be noted that the embodiments described herein is served only for citing
Illustrate, be not limited to the present invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that：This need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
：Special characteristic, structure or the characteristic described with reference to the embodiment or example is comprised at least one embodiment of the invention.
Therefore, phrase " in one embodiment ", " in embodiment ", " example " for occurring in each place of entire disclosure
Or " example " is not necessarily all referring to same embodiment or example.Furthermore, it is possible to any appropriate combination and or sub-portfolio will be specific
Feature, structure or property combination in one or more embodiments or example.Additionally, those of ordinary skill in the art should manage
Solution, provided herein accompanying drawing is provided to descriptive purpose, and accompanying drawing is not necessarily drawn to scale.It should be appreciated that working as
When claiming element " being couple to " or " being connected to " another element, it can directly be coupled or be couple to another element or can deposit
In intermediary element.Conversely, when element " being directly coupled to " or " being directly connected to " another element is claimed, there is no intermediary element.
Identical reference indicates identical element.Term "and/or" used herein includes the item that one or more correlations are listed
Any and all combination of purpose.
For the problem proposed in background technology, embodiments of the invention propose one kind and can be opened according to external magnetic field adjustment
Close the Switching Power Supply of frequency.When Switching Power Supply is not affected by the impact of external magnetic field, the Switching Power Supply normal work, switch frequency
Rate is equal to predetermined frequency value；When Switching Power Supply is affected by external magnetic field, the Switching Power Supply enters diamagnetic pattern, switch
Frequency is equal to N times of predetermined frequency value, and N is the positive integer more than 1.
Fig. 1 shows the circuit block diagram of Switching Power Supply according to an embodiment of the invention 100.Switching Power Supply 100 includes connecing
Receive input voltage vin input port, provide output voltage Vo output port, including magnetic element 11 and master power switch 12
Power circuit 10, feedback circuit 20 and control circuit 30, wherein master power switch 12 is coupled to magnetic element 11.Feedback
The sampling and outputting voltage Vo of circuit 20, and the voltage feedback signal VFB for representing output voltage Vo is provided.The receiving voltage of control circuit 30
Feedback signal VFB, and switch controlling signal Vg is provided to control the conducting and shut-off of master power switch 12.The basis of control circuit 30
Voltage feedback signal VFB controls the dutycycle of master power switch 12.Skilled person will appreciate that, the duty of master power switch 12
Than representing the conducting duration of master power switch 12 and the ratio of switch periods.It is outer that control circuit 30 judges whether Switching Power Supply is subject to
The impact in portion magnetic field.When Switching Power Supply 100 is not affected by the impact of external magnetic field, Switching Power Supply 100 is in normal mode of operation,
The switching frequency Fs of the control master power switch 12 of control circuit 30 is equal to predetermined frequency value Fset1；Otherwise when Switching Power Supply 100 is received
To external magnetic field impact when, Switching Power Supply 100 enter diamagnetic pattern, control circuit 30 control master power switch 12 switch frequency
Rate Fs is equal to predetermined frequency value Fset2, and predetermined frequency value Fset2 is for example equal to N times of predetermined frequency value Fset1, and wherein N is big
In 1 positive integer.The switching frequency Fs of master power switch 12 i.e. the switching frequency of Switching Power Supply 100.Predetermined frequency value
Fset1, Fset2 are constant, and such as Fset1 is equal to 200kHz, and Fset2 is equal to 400kHz.
In one embodiment, control circuit 30 includes error amplifying unit 31, magnetic field detection unit 32, FREQUENCY CONTROL list
Unit 33 and switch control unit 34.Error amplifying unit 31 has first input end, the second input and output end, wherein
First input end reception reference signal Vref, the second input receiving voltage feedback signal VFB, error amplifying unit 31 is according to ginseng
The difference (Vref-VFB) for examining signal Vref and voltage feedback signal VFB provides error amplification signal COMP in its output end.Magnetic
Field detector unit 32 judges whether Switching Power Supply 100 is affected by external magnetic field, and provides magnetic field detection letter in its output end
Number Mag.Frequency control unit 33 has first input end, the second input, the 3rd input and output end, wherein the first input
End is coupled to the output end of magnetic field detection unit 32 to receive magnetic field detection signal Mag, and the second input receives frequency arranges electricity
Pressure Vset, the 3rd input receives frequency adjustment voltage Vsub, output end is according to magnetic field detection signal Mag, set of frequency voltage
Vset and frequency adjustment voltage Vsub output clock signals Clk.When magnetic field detection signal Mag indicates that Switching Power Supply 100 is not affected by
During the impact of external magnetic field, frequency control unit 33 controls frequency of clock signal Clk etc. in response to set of frequency voltage Vset
In predetermined frequency value Fset1；When magnetic field detection signal Mag indicates that Switching Power Supply 100 is affected by external magnetic field, frequency control
Unit processed 33 is equal to frequency in response to the frequency of set of frequency voltage Vset and frequency adjustment voltage Vsub control clock signals Clk
Preset value Fset2.Switch control unit 34 has first input end, the second input and output end, wherein first input end coupling
The output end of error amplifying unit 31 is connected to receive error amplification signal COMP, the second input is coupled to frequency control unit
To receive clock signal Clk, switch control unit 34 is existed 33 output end based on error amplification signal COMP and clock signal Clk
Its output end provides switch controlling signal Vg to control the conducting and shut-off of master power switch 12.Wherein, switch control unit 34
The dutycycle of master power switch 12 is controlled based on error amplification signal COMP, master power switch 12 is controlled based on clock signal Clk
Switching frequency Fs.
In one embodiment, magnetic element 11 includes inductance or transformer.
In one embodiment, master power switch 12 be controllable semiconductor switch device, such as metal-oxide semiconductor (MOS)
Field-effect transistor (MOSFET), LDMOS (LDMOS), igbt (IGBT).
The switching frequency Fs that Switching Power Supply 100 passes through adjustment master power switch 12, is ensureing controllable same of switching frequency Fs
When, weaken or eliminate impact of the external magnetic field to Switching Power Supply 100, it is ensured that Switching Power Supply 100 is under strong magnetic field circumstance
Can normal work.
Fig. 2 shows the circuit block diagram of Switching Power Supply 200 according to an embodiment of the invention.Embodiment shown in Fig. 2
By taking reverse exciting topological as an example, but skilled person will appreciate that, other suitable circuit topologies can be used for the present invention, example
Such as LLC resonance circuits, booster circuit.Magnetic element that Switching Power Supply 200 includes being made up of transformer T1, master power switch S1,
Rectification circuit 21, the feedback circuit being made up of optic coupling element 22 and resistance R1 and control circuit 30.Transformer T1 has reception
The armature winding of input voltage vin and the secondary windings by the offer output voltage Vo of rectification circuit 21, master power switch S1 couplings
It is connected to armature winding.One end of rectification circuit 21 is coupled to the secondary windings of transformer T1, and the other end of rectification circuit 21 is provided
Output voltage Vo.In the embodiment shown in Figure 2, rectification circuit 21 includes commutation diode D1.Switching Power Supply 200 also includes coupling
Input capacitance C1 being connected between input voltage vin and primary side reference ground GND1, and it is coupled in output voltage Vo and secondary ginseng
Examine output capacitance C2 between ground GND2.In one embodiment, Switching Power Supply 200 also (is not shown including current detection circuit
Go out), for the electric current Is that master power switch S1 is flow through in detection, and provide the current detection signal CS for representing electric current Is.In Fig. 2 institutes
In the embodiment shown, magnetic field detection unit 32 receives error amplification signal COMP or current detection signal CS, and is put according to error
Big signal COMP or current detection signal CS judges whether Switching Power Supply 200 is affected by external magnetic field, and provides magnetic field inspection
Survey signal Mag.
In the embodiment shown in Figure 2, error amplifying unit 31 includes error amplifier EA and its compensation network 23.Error
The in-phase input end of amplifier EA receives reference signal Vref, inverting input receiving voltage feedback signal VFB, output end according to
The difference of reference signal Vref and voltage feedback signal VFB provides error amplification signal COMP.Compensation network 23 for example can be wrapped
Include lead compensation network, lag compensation network or lead-lag compensation network.In the embodiment shown in Figure 2, network is compensated
23 include resistance Rx, the electric capacity Cx being coupled in series between the inverting input of error amplifier EA and output end.This area skill
Art personnel understand that compensation network 23 is not limited to the specific embodiment shown in Fig. 2.
In one embodiment, control circuit 30 also includes current control unit 35, with first input end, the second input
End and output end, wherein first input end receive error amplification signal COMP, and the second input receives current detection signal CS, defeated
Go out end and current controling signal VI is produced according to the comparative result of error amplification signal COMP and current detection signal CS.Switch control rule
Unit 34 adjusts the dutycycle of master power switch S1 according to current controling signal VI.In the embodiment shown in Figure 2, current control
Unit 35 includes comparator CMP.
In the embodiment shown in Figure 2, switch control unit 34 includes RS triggers circuits, and its set end S is coupled to frequency
To receive clock signal Clk, its reset terminal R is coupled to the output end of current control unit 35 to connect to the output end of control unit 33
Current controling signal VI is received, its output end provides switch controlling signal Vg according to clock signal Clk and current controling signal VI.
In one embodiment, periodic setting switch control signal Vg of clock signal Clk is with during the conducting for controlling master power switch S1
Carve, current controling signal VI believes according to the control of the comparative result reset switch of current sampling signal CS and error amplification signal COMP
Number Vg, to control the shut-off moment of master power switch S1.In another embodiment, the reset terminal of RS triggers circuits 34 is coupled to
The output end of error amplifying unit 31 to receive error amplification signal COMP, and according to error amplification signal COMP reset switch controls
Signal Vg processed, to control the shut-off moment of master power switch S1.
Fig. 3 shows that Switching Power Supply 200 shown in Fig. 2 according to an embodiment of the invention is adjusted according to error amplification signal COMP
The schematic diagram of whole switching frequency Fs.Schematic diagram abscissa shown in Fig. 3 is error amplification signal COMP, and ordinate is switching frequency
Fs.When Switching Power Supply 200 is not affected by the impact of external magnetic field, the switching frequency Fs of master power switch S1 is equal to predetermined frequency value
Fset1.As shown in figure 3, when error amplification signal COMP is more than threshold value Vth1, judging that Switching Power Supply 200 is subject to external magnetic field
Impact, magnetic field detection signal Mag=1, Switching Power Supply 200 enter diamagnetic pattern, control master power switch S1 switching frequency
Fs is equal to predetermined frequency value Fset2；When error amplification signal COMP is less than threshold value Vth2, judge external magnetic field to Switching Power Supply
200 impact releasing or Switching Power Supply 200 are not affected by the impact of external magnetic field, magnetic field detection signal Mag=0, Switching Power Supply 200
Diamagnetic pattern is exited, the switching frequency Fs for controlling master power switch S1 is equal to predetermined frequency value Fset1.Threshold value Vth1 is more than threshold value
Vth2。
Fig. 4 shows the circuit structure diagram of magnetic field detection unit 32 according to an embodiment of the invention.In the reality shown in Fig. 4
In applying example, magnetic field detection unit 32 includes stagnant ring comparison circuit 41, including first input end, the second input, the 3rd input
And output end, wherein first input end reception error amplification signal COMP, the second input reception threshold value Vth1, the 3rd input
Threshold value Vth2 is received, output end provides magnetic field detection according to the comparative result of error amplification signal COMP and threshold value Vth1, Vth2
Signal Mag.
Fig. 5 shows that Switching Power Supply 200 is according to the oblique of current detection signal CS shown in Fig. 2 according to an embodiment of the invention
Rate Rcs adjusts the schematic diagram of switching frequency Fs.Schematic diagram abscissa shown in Fig. 5 is the slope Rcs of current detection signal CS, indulges
Coordinate is switching frequency Fs.When Switching Power Supply 200 is not affected by the impact of external magnetic field, the switching frequency Fs of master power switch S1
Equal to predetermined frequency value Fset1.As shown in figure 5, when the slope Rcs of current detection signal CS is more than threshold k 1*Vin, judging
Switching Power Supply 200 is affected by external magnetic field, magnetic field detection signal Mag=1, and Switching Power Supply 200 enters diamagnetic pattern, control
The switching frequency Fs of master power switch S1 is equal to predetermined frequency value Fset2；When the slope Rcs of current detection signal CS is less than threshold value
During K2*Vin, judge that impact releasing or Switching Power Supply 200 of the external magnetic field to Switching Power Supply 200 is not affected by the shadow of external magnetic field
Ring, magnetic field detection signal Mag=0, Switching Power Supply 200 exits diamagnetic pattern, control switching frequency Fs of master power switch S1 etc.
In predetermined frequency value Fset1.Wherein COEFFICIENT K 1, K2 is more than zero, and K1 is more than K2.
Fig. 6 shows the circuit structure diagram of magnetic field detection unit 32 according to another embodiment of the present invention.Reality shown in Fig. 6
In applying example, magnetic field detection unit 32 includes slope detecting circuit 61, electric voltage feed forward circuit 62 and comparison circuit 63.Slope is examined
Slowdown monitoring circuit 61 receives current detection signal CS, and provides the slope Rcs of current detection signal CS according to current detection signal CS.
In one embodiment, slope detecting circuit 61 includes electric capacity 64 and resistance 65.The first end of electric capacity 64 receives current detection signal
CS, the second end of electric capacity 64 provides the slope Rcs of current detection signal CS.Resistance 65 is coupled in the second end of electric capacity 64 and former limit
Between reference ground.The receives input voltage Vin of electric voltage feed forward circuit 62, and provide threshold k 1*Vin, K2* according to input voltage vin
Vin.In one embodiment, electric voltage feed forward circuit 62 includes resistance 66, resistance 67, resistance 68.The coupled in series of resistance 66～68
Between input voltage vin and primary side reference ground, resistance pressure-dividing network is constituted, the wherein common port of resistance 66 and resistance 67 is provided
The common port of threshold k 1*Vin, resistance 67 and resistance 68 provides threshold k 2*Vin.Comparison circuit 63 include first input end, second
Input, the 3rd input and output end, wherein first input end receive the slope Rcs of current detection signal CS, the second input
End receives threshold k 1*Vin, and the 3rd input receives threshold k 2*Vin, output end according to the slope Rcs of current detection signal CS and
The comparative result of threshold k 1*Vin, K2*Vin provides magnetic field detection signal Mag.When master power switch S1 is turned on, if electric current inspection
The slope Rcs for surveying signal is more than threshold k 1*Vin, judges that Switching Power Supply 200 is affected by external magnetic field, magnetic field detection signal
Mag is changed into first state, such as Mag=" 1 "；When master power switch S1 is turned on, if the slope Rcs of current detection signal is less than
Threshold k 2*Vin, judges that Switching Power Supply 200 is no longer influenced by the impact of external magnetic field, and magnetic field detection signal Mag is changed into the second state,
Such as Mag=" 0 "；And when master power switch S1 is turned off, magnetic field detection signal Mag remains unchanged.In one embodiment,
Comparison circuit 63 includes comparator 631, comparator 632, gate circuit 633, gate circuit 634 and rest-set flip-flop 635.Comparator
631 in-phase input end receives the slope Rcs of current detection signal CS, and the inverting input of comparator 631 receives threshold k 1*
Vin.The in-phase input end of comparator 632 receives the slope Rcs of current detection signal CS, the anti-phase input termination of comparator 632
Receive threshold k 2*Vin.Gate circuit 633 has first input end, the second input and output end, and wherein first input end is coupled to
The output end of comparator 631, the second input receives switch controlling signal Vg.Gate circuit 634 has first input end, second defeated
Enter end and output end, wherein first input end is coupled to the output end of comparator 632, and the second input receives switch controlling signal
Vg.Rest-set flip-flop 635 has set end S, reset terminal R and output end Q, and wherein set end S is coupled to the output of gate circuit 633
End, reset terminal R is coupled to the output end of gate circuit 634, and output end Q provides magnetic field detection signal Mag.As switch controlling signal Vg
When controlling master power switch S1 conductings, and the slope Rcs of current detection signal more than threshold k 1*Vin, the set of rest-set flip-flop 635
The magnetic field detection signal Mag of output high level；When switch controlling signal Vg control master power switch S1 conductings, and current detecting are believed
Number slope Rc when being less than threshold k 2*Vin, rest-set flip-flop 635 resets the low level magnetic field detection signal Mag of output；Work as switch
When control signal Vg control master power switch S1 is turned off, magnetic field detection signal Mag remains unchanged.
Fig. 7 shows the circuit structure diagram of frequency control unit according to an embodiment of the invention 33.Enforcement shown in Fig. 7
In example, frequency control unit 33 includes generating circuit from reference voltage 71, comparison circuit 75 and by electric capacity 72, current source 73, switch
74 and one-shot circuit 76 composition sawtooth waveforms generative circuit.The receives frequency of generating circuit from reference voltage 71 arranges voltage
Vset, frequency adjustment voltage Vsub, magnetic field detection signal Mag, and according to set of frequency voltage Vset, frequency adjustment voltage Vsub
Reference voltage Vfr is provided with magnetic field detection signal Mag.When judging that Switching Power Supply 200 is not affected by the impact of external magnetic field, magnetic field
Detection signal Mag is the second state, and such as Mag=0, reference voltage Vfr is equal to set of frequency voltage Vset；When judgement switch electricity
When source 200 is affected by external magnetic field, magnetic field detection signal Mag is first state, such as Mag=1, reference voltage Vfr etc.
Difference Vset-Vsub of voltage Vsub is adjusted in set of frequency voltage Vset and frequency.In one embodiment, reference voltage is produced
Circuit 71 includes computing circuit 77 and switch 78.Computing circuit 77 includes first input end, the second input and output end, wherein
First input end receives frequency arranges the first end that voltage Vset, the second input are coupled to switch 78, and output end provides reference
Voltage Vfr.Second end receives frequency adjustment voltage Vsub of switch 78, the control end for switching 78 receives magnetic field detection signal Mag,
Switch 78 is turned on and turned off under the control of magnetic field detection signal Mag.When magnetic field detection signal Mag indicates Switching Power Supply 200 not
When being affected by external magnetic field, switch 78 is turned off, and the second input of computing circuit 77 is zero, and reference voltage Vfr is equal to frequency
Rate arranges voltage Vset.When magnetic field detection direction switch signal power supply 200 is affected by external magnetic field, switch 78 is turned on,
Reference voltage Vfr is equal to set of frequency voltage Vset and frequency adjusts difference Vset-Vsub of voltage Vsub.Those skilled in the art
Understand, generating circuit from reference voltage 71 is not limited to the specific embodiment shown in Fig. 7.Electric capacity 72 has offer sawtooth voltage Vsaw
First end and be coupled to the second end of primary side reference ground, the coupled in parallel of current source 73 is closed at the two ends of electric capacity 72 in switch 74
Electric capacity 72 is charged when disconnected so that sawtooth voltage Vsaw increases to reference voltage Vfr.74 coupled in parallel are switched in electric capacity 72
Two ends, one-shot circuit 76 provides single pulse signal Pul with controlling switch 74 according to clock signal Clk.Work as sawtooth voltage
When Vsaw is more than reference voltage Vfr, the upset of clock signal Clk is for example changed into high level, and one-shot circuit 76 is provided and remains certain
The single pulse signal Pul of time high level is turned on controlling switch 74, and electric capacity 72 is discharged by switch 74.Single pulse signal Pul
For example maintain 2us high level.Comparison circuit 75 has first input end, the second input and output end, wherein first input end
Reference voltage Vfr is received, the second input receives sawtooth voltage Vsaw, and output end is according to reference voltage Vfr and sawtooth waveforms electricity
The result that pressure Vsaw compares provides clock signal Clk.
Fig. 8 shows the control method flow chart for Switching Power Supply according to an embodiment of the invention.The Switching Power Supply
Including magnetic element, the master power switch for being coupled to magnetic element, the input port of receives input voltage and offer output electricity
The output port of pressure.The control method includes step S11～S16.
In step S11, according to output voltage voltage feedback signal is provided.
In step S12, according to the difference between reference signal and voltage feedback signal error amplification signal is provided.
In step S13, according to error amplification signal, the dutycycle of master power switch is controlled.
In step S14, judge whether Switching Power Supply is affected by external magnetic field.If Switching Power Supply is not affected by external magnetic field
Impact, then into step S15, Switching Power Supply be in normal mode of operation, controlling switch frequency be equal to first frequency preset value.
If Switching Power Supply is affected by external magnetic field, into step S16, Switching Power Supply enters diamagnetic pattern, controlling switch frequency
Equal to second frequency preset value, wherein second frequency preset value is more than first frequency preset value.In one embodiment, the second frequency
Rate preset value is equal to N times of first frequency preset value, and N is the integer more than 1.
In one embodiment, when error amplification signal is more than first threshold, judge that Switching Power Supply is subject to external magnetic field
Impact；When error amplification signal is less than Second Threshold, judge that Switching Power Supply is not affected by the impact of external magnetic field.
In one embodiment, the control method also includes：The electric current of master power switch is flow through in detection, there is provided current detecting
Signal.When the slope of current detection signal is more than three threshold values, judge that Switching Power Supply is affected by external magnetic field；Work as electric current
When the slope of detection signal is less than four threshold values, judge that Switching Power Supply is not affected by the impact of external magnetic field.Wherein the 3rd threshold value is big
In the 4th threshold value, and the 3rd threshold value and the 4th threshold value equidirectional change with the change of input voltage, such as with input electricity
The increase of pressure and increase, reduce with the reduction of input voltage.
In one embodiment, the control method also includes：When Switching Power Supply is not affected by the impact of external magnetic field, according to
Set of frequency voltage provides reference voltage；When Switching Power Supply is affected by external magnetic field, according to set of frequency voltage and frequency
Rate adjustment difference in voltage provides reference voltage；By control to capacitor charge and discharge, provide periodically variable at the two ends of electric capacity
Sawtooth voltage；According to the result that reference voltage compares with sawtooth voltage, there is provided clock signal is controlling master power switch
Switching frequency.Wherein when sawtooth voltage is more than reference voltage, clock signal upset, electric capacity electric discharge, master power switch is led
It is logical.
Although exemplary embodiment describing the present invention with reference to several, it is to be understood that, term used is to illustrate and show
Example property and nonrestrictive term.Because the present invention can be embodied as in a variety of forms without deviating from the spiritual or real of invention
Matter, it should therefore be appreciated that above-described embodiment is not limited to any aforesaid details, and the spirit that should be limited in appended claims
Widely explain with scope, therefore the whole changes in falling into claim or its equivalent scope and remodeling all should be the power of enclosing
Profit requires to be covered.
Claims (11)
1. a kind of control circuit for Switching Power Supply, the Switching Power Supply includes magnetic element, is coupled to the master of magnetic element
The output port of power switch, the input port of receives input voltage and offer output voltage, the control circuit includes：
Error amplifying unit, with first input end, the second input and output end, wherein first input end is received with reference to letter
Number, the second input receives the voltage feedback signal for representing output voltage, and the error amplifying unit is according to reference signal and electricity
Difference between pressure feedback signal, in output end error amplification signal is provided；
Magnetic field detection unit, with output end, whether the magnetic field detection unit judges Switching Power Supply is subject to the shadow of external magnetic field
Ring, and magnetic field detection signal is provided in its output end；
Frequency control unit, with first input end, the second input, the 3rd input and output end, wherein first input end
It is coupled to the output end of magnetic field detection unit to receive magnetic field detection signal, the second input receives frequency arranges voltage, the 3rd
Input receives frequency adjusts voltage, and the frequency control unit is according to magnetic field detection signal, set of frequency voltage and frequency
Adjustment voltage provides clock signal in its output end, when magnetic field detection direction switch signal power supply is not affected by the impact of external magnetic field
When, frequency control unit is equal to a predetermined frequency value according to the frequency of set of frequency voltage-control clock signal, works as magnetic field detection
When direction switch signal power supply receives the impact of external magnetic field, frequency control unit is adjusted according to set of frequency voltage and frequency
The frequency of voltage-control clock signal is equal to N times of the predetermined frequency value, and N is the integer more than 1；And
Switch control unit, with first input end, the second input and output end, wherein first input end is coupled to error and puts
The output end of big unit, the second input is coupled to the output end of frequency control unit to receive clock signal, the switch control
Unit processed provides switch controlling signal to control the conducting and shut-off of master power switch, wherein switch control unit in its output end
The dutycycle of master power switch is controlled in response to error amplification signal, in response to clock signal the switch frequency of master power switch is controlled
Rate.
2. control circuit as claimed in claim 1, wherein magnetic field detection unit also include input, and the input is received and missed
Difference amplifies signal, and magnetic field detection unit judges whether Switching Power Supply is affected by external magnetic field according to error amplification signal, its
In when error amplification signal be more than first threshold when, judge that Switching Power Supply is affected by external magnetic field, magnetic field detection signal change
For first state, and when error amplification signal is less than Second Threshold, judge that Switching Power Supply is no longer influenced by the shadow of external magnetic field
Ring, magnetic field detection signal is changed into the second state, wherein first threshold is more than Second Threshold.
3. control circuit as claimed in claim 1, wherein magnetic field detection unit also include input, and the input receives generation
Table flows through the current detection signal of the electric current of master power switch, and magnetic field detection unit judges according to the slope of current detection signal
Whether Switching Power Supply is affected by external magnetic field, wherein when the slope of current detection signal is more than three threshold values, judging out
Powered-down source is affected by external magnetic field, and magnetic field detection signal is changed into first state, and when the slope of current detection signal is little
When four threshold values, judge that Switching Power Supply is no longer influenced by the impact of external magnetic field, magnetic field detection signal is changed into the second state, wherein
3rd threshold value is more than the 4th threshold value.
4. control circuit as claimed in claim 1, wherein magnetic field detection unit also includes：
Slope detecting circuit, reception represents the current detection signal of the electric current for flowing through master power switch, the slope detection electricity
Road provides the slope of current detection signal according to current detection signal；
Electric voltage feed forward circuit, according to input voltage the 3rd threshold value and the 4th threshold value are provided, wherein the 3rd threshold value and the 4th threshold value with
The change of input voltage and change, and the 3rd threshold value is more than the 4th threshold value；And
Comparison circuit, the slope, the 3rd threshold value and the 4th threshold value according to current detection signal provides magnetic field detection signal, its
In when current detection signal slope be more than three threshold values when, judge that Switching Power Supply is affected by external magnetic field, magnetic field detection
Signal is changed into first state, and when the slope of current detection signal is less than four threshold values, judges that Switching Power Supply is no longer influenced by
The impact of external magnetic field, magnetic field detection signal is changed into the second state.
5. control circuit as claimed in claim 1, wherein frequency control unit also includes：
Generating circuit from reference voltage, receives frequency arranges voltage, frequency adjustment voltage and magnetic field detection signal, and is set according to frequency
Put voltage, frequency adjustment voltage and magnetic field detection signal and reference voltage is provided, wherein when magnetic field detection direction switch signal power supply
When receiving the impact of external magnetic field, reference voltage is equal to set of frequency voltage and adjusts difference in voltage with frequency, works as magnetic field detection
When direction switch signal power supply is not affected by the impact of external magnetic field, reference voltage is equal to set of frequency voltage；
Sawtooth waveforms generative circuit, there is provided periodically variable sawtooth voltage；And
Comparison circuit, with first input end, the second input and output end, wherein first input end receives reference voltage, the
Two inputs receive sawtooth voltage, and output end provides clock letter according to the result that reference voltage compares with sawtooth voltage
Number.
6. a kind of Switching Power Supply, including：
Transformer, with armature winding and secondary windings, wherein armature winding receives input voltage；
Master power switch, is coupled to armature winding；
Rectification circuit, is coupled to secondary windings and provides output voltage；
Feedback circuit, there is provided represent the voltage feedback signal of output voltage；And
Control circuit, receiving voltage feedback signal, and provide switch controlling signal to control main power according to voltage feedback signal
The conducting and shut-off of switch, the control circuit in response to voltage feedback signal to control the dutycycle of master power switch, it is described
Whether control circuit is affected to control the switching frequency of master power switch according to Switching Power Supply by external magnetic field, wherein working as switch
When power supply is not affected by the impact of external magnetic field, the switching frequency for controlling master power switch is equal to predetermined frequency value, and when switch
When power supply is affected by external magnetic field, the switching frequency for controlling master power switch is equal to N times of the predetermined frequency value, and N is
Integer more than 1.
7. Switching Power Supply as claimed in claim 6, wherein control circuit is as any one of Claims 1 to 5.
8. a kind of control method for Switching Power Supply, the Switching Power Supply includes magnetic element, is coupled to the master of magnetic element
The output port of power switch, the input port of receives input voltage and offer output voltage, the control method includes：
Voltage feedback signal is provided according to output voltage；
Error amplification signal is provided according to the difference between reference signal and voltage feedback signal；
According to error amplification signal, the dutycycle of master power switch is controlled；And
Judge whether Switching Power Supply is affected by external magnetic field；Wherein
When Switching Power Supply is not affected by the impact of external magnetic field, Switching Power Supply is in normal mode of operation, controlling switch frequency etc.
In first frequency preset value；And
When Switching Power Supply is affected by external magnetic field, Switching Power Supply enters diamagnetic pattern, and controlling switch frequency is equal to the second frequency
Rate preset value, wherein second frequency preset value are more than first frequency preset value.
9. control method as claimed in claim 8, wherein judging whether Switching Power Supply is affected to include by external magnetic field：
When error amplification signal is more than first threshold, judge that Switching Power Supply is subject to external magnetic fields；And
When error amplification signal is less than Second Threshold, judge that Switching Power Supply is not affected by the impact of external magnetic field；Wherein
First threshold is more than Second Threshold.
10. control method as claimed in claim 8, wherein judging whether Switching Power Supply is affected to include by external magnetic field：
The electric current of master power switch is flow through in detection, there is provided current detection signal；
When the slope of current detection signal is more than three threshold values, judge that Switching Power Supply is affected by external magnetic field；And
When the slope of current detection signal is less than four threshold values, judge that Switching Power Supply is not affected by the impact of external magnetic field；Wherein
3rd threshold value is more than the 4th threshold value, and the 3rd threshold value and the 4th threshold value change with the change of input voltage.
11. control methods as claimed in claim 8, also include：
When Switching Power Supply is not affected by the impact of external magnetic field, according to set of frequency voltage reference voltage is provided；
When Switching Power Supply is affected by external magnetic field, according to set of frequency voltage and frequency adjustment difference in voltage reference is provided
Voltage；
Periodically variable sawtooth voltage is provided；
According to reference voltage and the comparative result of sawtooth voltage, there is provided clock signal with control master power switch switch frequency
Rate.
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| CN201610953347.7A CN106655823B (en) | 2016-11-03 | 2016-11-03 | Anti-magnetic interference switching power supply and control circuit and control method thereof |
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| CN201610953347.7A CN106655823B (en) | 2016-11-03 | 2016-11-03 | Anti-magnetic interference switching power supply and control circuit and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478583A (en) * | 2020-04-24 | 2020-07-31 | 无锡芯朋微电子股份有限公司 | Switching power supply control circuit and switching power supply control method applying same |
| CN117174342A (en) * | 2023-11-03 | 2023-12-05 | 陕西星环聚能科技有限公司 | Device operating in pulsed magnetic field environment, control method thereof and nuclear fusion system |
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| CN101557167A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Bifrequency control method of switch power supply and device thereof |
| CN105070711A (en) * | 2015-08-18 | 2015-11-18 | 硅谷数模半导体（北京）有限公司 | Method and device for resisting electromagnetic interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557167A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Bifrequency control method of switch power supply and device thereof |
| CN105070711A (en) * | 2015-08-18 | 2015-11-18 | 硅谷数模半导体（北京）有限公司 | Method and device for resisting electromagnetic interference |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478583A (en) * | 2020-04-24 | 2020-07-31 | 无锡芯朋微电子股份有限公司 | Switching power supply control circuit and switching power supply control method applying same |
| CN117174342A (en) * | 2023-11-03 | 2023-12-05 | 陕西星环聚能科技有限公司 | Device operating in pulsed magnetic field environment, control method thereof and nuclear fusion system |
| CN117174342B (en) * | 2023-11-03 | 2024-02-23 | 陕西星环聚能科技有限公司 | Device operating in pulsed magnetic field environment, control method thereof and nuclear fusion system |
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