CN103401403A - Inductance charging charge control method and application of control method in switching power supply - Google Patents
Inductance charging charge control method and application of control method in switching power supply Download PDFInfo
- Publication number
- CN103401403A CN103401403A CN2013102773601A CN201310277360A CN103401403A CN 103401403 A CN103401403 A CN 103401403A CN 2013102773601 A CN2013102773601 A CN 2013102773601A CN 201310277360 A CN201310277360 A CN 201310277360A CN 103401403 A CN103401403 A CN 103401403A
- Authority
- CN
- China
- Prior art keywords
- output
- signal
- power supply
- switching power
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to an inductance charging charge control method and an application of the control method in a switching power supply. The method comprises the steps of: acquiring current signals of output filter inductance of the switching power supply and output voltage or current signals of the switching power supply; acquiring inductance charging current integrated signals, carrying out PI regulation on the output signals, and outputting reference signals; comparing the current integrated signals with the reference signals, generating PWM control signal to control on-off of a power switch tube of a DC-DC conversion circuit in the switching power supply, and enabling charge transmitted to an output end from an input power supply in each switching period of the DC-DC conversion circuit to be in direct proportion to a set value of the output signals. The inductance charging charge control method controls the filter inductance charging current of the switching power supply directly, prevents input power ripples and interferences from being transmitted to the output end, and filters high-frequency ripples, thereby realizing the purpose of reducing output ripples of the switching power supply greatly, and meeting a requirement of outputting ultralow ripples to the switching power supply.
Description
Technical field
The present invention relates to induction charging electric charge control method, and by the application of this control method in Switching Power Supply, for reducing the output ripple of Switching Power Supply.
Background technology
Development along with modern power electronics technology, the switch DC power supply is widely used, the control technology of switch DC power supply also constantly appears being applicable to simultaneously, as voltage control, Current Control, the control of stagnant ring, Cycle Control etc., particularly based on the Cycle Control principle, electric charge control, the control of accurate electric charge, imitative Current Control etc. have been derived again.
Wherein, Cycle Control is that switch amount or switch tube voltage are taken a sample, integration, comparison, produces pwm control signal, implements the control to Switching Power Supply.Electric charge is controlled and accurate electric charge control be all utilize current transformer to the electric current that flows through switching tube take a sample, integration, comparison, produce pwm control signal, the control of enforcement to Switching Power Supply.Electric charge is controlled and the impact of the parameter such as switching tube parasitic capacitance, transformer magnetizing current and switch interference etc. is not all considered in accurate electric charge control.Imitative Current Control is to want the imitative current signal of reconstruct switching tube electric current.These control methods based on the Cycle Control principle are to input voltage disturbance sensitivity, can stop the input voltage ripple to be delivered to output, reduce output ripple, but these control methods are actually, the voltage of switching tube or electric current are controlled as switching value, also, also can there be a certain amount of output ripple in untrue reflection output voltage and electric current.
And voltage control and Current Control are that output current and voltage are carried out to FEEDBACK CONTROL, to the disturbance sensitivity of input power, cause the ripple of input voltage to be delivered to output, cause output ripple larger.Particularly mostly the sampling of electric current is to adopt current transformer or Hall current sensor, also can brings measure error, thereby affect the control precision of Switching Power Supply.
For the Switching Power Supply of the ultralow ripple of needs, such as high accuracy Switching Power Supply on high precision measurement power supply, high new equipment etc., above-mentioned control method all can not meet the requirement to the ultralow ripple of Switching Power Supply.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art and a kind of induction charging electric charge control method and the application in Switching Power Supply thereof are provided, use control method of the present invention can reduce the output ripple of Switching Power Supply, realize the ultralow ripple of output of Switching Power Supply.
Realize that the technical scheme that the object of the invention adopts is: a kind of control method based on the induction charging electric charge comprises:
Using the charging current of output inductor as control object, with accurate sample resistance, the charging current of described output inductor is taken a sample, after accurate modulate circuit, obtain sampled signal to be proportional to the signal of induction charging electric current, this signal is carried out to the integral voltage that integration obtains being proportional to the induction charging electric charge;
The error of output signal and output signal set-point after amplifying, is exported pi regulator to reference signal;
Described integral voltage and described reference signal are compared, produce pwm control signal.
In addition, the present invention also provides the application of above-mentioned induction charging electric charge control method in Switching Power Supply, comprising:
Obtain the signal of the charging current that is proportional to the Switching Power Supply output inductor, and the output signal that is proportional to output current or the voltage of Switching Power Supply;
The signal of described charging current is obtained to current integration voltage through integration, and output reference signal after described output signal is regulated; Described current integration voltage and described reference signal are relatively, produce pwm control signal, go to control in described Switching Power Supply the turn-on and turn-off of power switch pipe in the DC/DC translation circuit, the electric charge that makes described DC/DC translation circuit be transferred to output in each switch periods from input power is proportional to the set-point of output signal, realizes Switching Power Supply output low ripple.
In technique scheme, the error of the output signal set-point of the output signal of described curtage and this curtage after carrying out the error amplification, pi regulator is exported to reference signal.
Induction charging electric charge control method of the present invention, can be for the control of Switching Power Supply, by the induction charging electric current to Switching Power Supply, control, guarantee to be proportional at the electric charge that each switch periods is transferred to the Switching Power Supply output set-point of output signal, stop input power ripple and interference to be delivered to output, and the filtering high frequency ripple, realization greatly reduces the purpose of Switching Power Supply output ripple, meets the requirement to the ultralow ripple of Switching Power Supply output.
The accompanying drawing explanation
Fig. 1 is the circuit diagram that adopts induction charging electric charge control method of the present invention to control Switching Power Supply;
Fig. 2 controls timing waveform when in Fig. 1, Switching Power Supply is worked;
Fig. 3 is another circuit diagram that adopts induction charging electric charge control method of the present invention to control Switching Power Supply.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1
Circuit as shown in Figure 1, the power circuit of Switching Power Supply comprise DC/DC converter, LC filter; This Switching Power Supply also comprises: the accurate sample circuit of inductive current, the accurate sample circuit of output voltage, accurate modulate circuit, pi regulator, precision comparator, pulse oscillator, rest-set flip-flop, resetting integrator and logical AND drive circuit etc., in the present embodiment, the resetting integrator reset switch is selected analog switch.
In Fig. 1, L, C are respectively output inductor, electric capacity, and the accurate sample circuit of the present embodiment inductive current used is accurate sample resistance R1, and L connects with filter inductance, and its resistance value is very little, and temperature is floated minimum, be used to obtaining inductive current i
LSampled signal.The voltage at R1 two ends is the sampled signal R1i of induction charging electric current
L.
The output signal that the present embodiment obtains Switching Power Supply is output voltage, and as shown in Figure 1, R3, R4 are the accurate sample resistances of output voltage, and be in parallel with filter capacitor after R3 and R4 series connection, V
oBe the output voltage of Switching Power Supply, the output sampled signal on accurate sample resistance R3 is
.
Accurate modulate circuit is respectively to the sampled signal R1i of the induction charging electric current from R1
LWith the output sampled signal from R3
Carry out the precision amplification and obtain k
1i
LAnd k
3V
o, and k
1i
LAnd k
3V
oBe proportional to respectively inductive current i
LAnd output voltage V
o, k wherein
1, k
2Be constant, by accurate sample circuit and accurate modulate circuit, determined.
By the signal k after amplifying
3V
oSet-point U with switch power source output voltage
refOutput after pi regulator carries out the error amplification is as reference signal u*.
The S of rest-set flip-flop end is connected with the output of pulse oscillator, and the R end is connected with the output of comparator,
End is connected with the reseting controling end of resetting integrator, and the Q end is connected with the pwm signal input of logical AND drive circuit.Wherein, the reset pulse of resetting integrator is from rest-set flip-flop
Signal, high level is effective, and resetting integrator is resetted.
The logical AND drive circuit will be delivered to the DC/DC translation circuit and is gone power ratio control switching tube (IGBT or power MOS pipe) to turn on and off after will from the pwm signal of rest-set flip-flop, distributing, and isolate, amplify.While powering on, rest-set flip-flop output Q signal and comparator output are low level, and PWM is low level, and the DC/DC translation circuit does not have energy output.
Timing waveform when Fig. 2 is the normal operation of the present embodiment Switching Power Supply.
During normal operation, pulse oscillator output clock pulse CLK removes to trigger rest-set flip-flop, and rest-set flip-flop output Q signal becomes high level, and output pwm signal is high, input power V
InThrough the DC/DC translation circuit, to inductance L and load, provide energy, the current i of inductance L
LIncrease, inductance is in charging; Rest-set flip-flop output simultaneously
Signal is low level, the analog switch open circuit, and resetting integrator is to k
1i
LIntegration, the output integral voltage
, R, C are integral parameters, the integrator that can reset output integral voltage V
intBe proportional to the DC/DC translation circuit and in each switch periods, from input power, be transferred to the electric charge of output.
Work as V
intDuring=u*, comparator upset output high level, the rest-set flip-flop zero clearing, the output Q signal becomes low level, and output pwm signal is low, input power V
InStop to inductance and load, providing energy through the DC/DC translation circuit current i of inductance L
LReduce, to load discharge; Rest-set flip-flop output simultaneously
Signal is high level, the short circuit of control simulation switch, and resetting integrator resets, and waits for next clock pulse CLK.
Embodiment 2
The present embodiment describes take the output signal of obtaining Switching Power Supply as output current.
As shown in Figure 3, L, C are respectively output inductor, electric capacity, and R1, R2 are respectively inductive current i
L, output current I
oAccurate sample resistance, resistance value is very little, temperature is floated minimum, R1 connects with filter inductance L, R2 connects with output.
Accurate modulate circuit carries out the accurate amplification of high-gain to the sampling voltage on R1, R2 respectively, and it exports k
1i
L, k
2I
oBe proportional to respectively inductive current i
L, output current i
o.k
2i
oSet-point I with output current
refOutput after pi regulator carries out the error amplification is as reference signal u*.The reset pulse of resetting integrator is from rest-set flip-flop
Signal, high level is effective, and resetting integrator is resetted.The logical AND drive circuit is delivered to the DC/DC translation circuit after the pwm signal from rest-set flip-flop is distributed, isolates, amplifies and is gone turning on and off of power ratio control switching tube (IGBT or power MOS pipe).
While starting working, rest-set flip-flop output Q signal and comparator output are low level, and PWM is low level, and pulse oscillator output clock pulse CLK removes to trigger rest-set flip-flop, and rest-set flip-flop output Q signal becomes high level, and output pwm signal is high, input power V
InThrough the DC/DC translation circuit, to inductance and load, provide energy, inductive current i
LIncrease; Rest-set flip-flop output simultaneously
Signal is low level, the analog switch open circuit, and integrator is to induction charging current signal k
1i
LIntegration, the output integral voltage
, arrangement obtains
, R, C are integral parameter, k
1Proportionality constant, V
intBe proportional to the induction charging current i
LIntegration, namely input power is transferred to the electric charge of inductance through the DC/DC translation circuit.
Work as V
intDuring=u*, comparator upset output high level, the rest-set flip-flop zero clearing, the output Q signal becomes low level, and output pwm signal is low, input power V
InStop to inductance and load, providing energy through the DC/DC translation circuit inductive current i
LReduce, to load discharge; Rest-set flip-flop output simultaneously
Signal is high level, the short circuit of control simulation switch, and integrator resets, and waits for next clock pulse CLK.
Induction charging electric charge control method of the present invention is directly by Switching Power Supply output inductor current i
LAs control object, with accurate sample resistance sampling, after accurate modulate circuit, obtain being proportional to the signal k of inductive current
1i
L, this signal is carried out exporting integral voltage V after integration
intSimultaneously to the output voltage V of Switching Power Supply
0Or electric current I
0Take a sample, through accurate modulate circuit, carry out after precision is amplified obtaining k
2I
0Or k
3V
0, then carry out after PI regulates exporting reference signal u* with the given reference value of output.V
intU* compares with the output reference signal, produce pwm signal, the power switch pipe that goes to control the DC/DC translation circuit after the logical AND drive circuit distributes, isolates, amplifies turns on and off in good time, stop the input power ripple to be delivered to output, guarantee that the DC/DC translation circuit is proportional to the given reference value of output in each switch periods from the electric charge that input power is transferred to output, after Switching Power Supply output LC filter circuit filtering high frequency ripple, obtain the direct current output of ultralow ripple.
Claims (4)
1. induction charging electric charge control method is characterized in that:
Using the charging current of output inductor as control object, with accurate sample resistance, the charging current of described output inductor is taken a sample, after accurate modulate circuit, obtain sampled signal to be proportional to the signal of induction charging electric current, this signal is carried out to the integral voltage that integration obtains being proportional to the induction charging electric charge;
The error of output signal and output signal set-point after amplifying, is exported pi regulator to reference signal;
Described integral voltage and described reference signal are compared, produce pwm control signal.
2. according to claim 1 based on the control method of induction charging electric charge, it is characterized in that: described pwm control signal distributes successively, isolates, amplifies through the logical AND drive circuit.
3. the application of the described induction charging electric charge of claim 1 control method in Switching Power Supply is characterized in that:
Obtain the signal of the charging current that is proportional to the Switching Power Supply output inductor, and the output signal that is proportional to the curtage of Switching Power Supply;
The signal of described charging current is obtained to the current integration signal through integration, and output reference signal after described output signal is regulated; Described current integration signal and described reference signal are relatively, produce pwm control signal, go to control in described Switching Power Supply the turn-on and turn-off of power switch pipe in the DC/DC translation circuit, the electric charge that makes described DC/DC translation circuit be transferred to output in each switch periods from input power is proportional to the set-point of output signal, realizes Switching Power Supply output low ripple.
4. the application of induction charging electric charge control method in Switching Power Supply according to claim 3 is characterized in that: the error of the output signal set-point of the output signal of described curtage and this curtage is exported to reference signal after pi regulator carries out the error amplification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102773601A CN103401403A (en) | 2013-07-03 | 2013-07-03 | Inductance charging charge control method and application of control method in switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102773601A CN103401403A (en) | 2013-07-03 | 2013-07-03 | Inductance charging charge control method and application of control method in switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103401403A true CN103401403A (en) | 2013-11-20 |
Family
ID=49564973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102773601A Pending CN103401403A (en) | 2013-07-03 | 2013-07-03 | Inductance charging charge control method and application of control method in switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103401403A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769738A (en) * | 2019-04-02 | 2020-10-13 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5572416A (en) * | 1994-06-09 | 1996-11-05 | Lucent Technologies Inc. | Isolated input current sense means for high power factor rectifier |
| US20050212498A1 (en) * | 2003-09-05 | 2005-09-29 | Kenichi Kubota | Switching power supply |
| CN101546963A (en) * | 2009-04-22 | 2009-09-30 | 南京航空航天大学 | Digital monocyclic control method of PFC converter |
| CN102355130A (en) * | 2011-10-09 | 2012-02-15 | 南通大学 | Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control |
| CN202737746U (en) * | 2012-06-14 | 2013-02-13 | 广东智造能源科技研究有限公司 | Improved single cycle control full bridge converter |
| CN103066844A (en) * | 2012-12-18 | 2013-04-24 | 南京信息工程大学 | Control method for average current on input side of buck converter |
-
2013
- 2013-07-03 CN CN2013102773601A patent/CN103401403A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5572416A (en) * | 1994-06-09 | 1996-11-05 | Lucent Technologies Inc. | Isolated input current sense means for high power factor rectifier |
| US20050212498A1 (en) * | 2003-09-05 | 2005-09-29 | Kenichi Kubota | Switching power supply |
| CN101546963A (en) * | 2009-04-22 | 2009-09-30 | 南京航空航天大学 | Digital monocyclic control method of PFC converter |
| CN102355130A (en) * | 2011-10-09 | 2012-02-15 | 南通大学 | Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control |
| CN202737746U (en) * | 2012-06-14 | 2013-02-13 | 广东智造能源科技研究有限公司 | Improved single cycle control full bridge converter |
| CN103066844A (en) * | 2012-12-18 | 2013-04-24 | 南京信息工程大学 | Control method for average current on input side of buck converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769738A (en) * | 2019-04-02 | 2020-10-13 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
| CN111769738B (en) * | 2019-04-02 | 2022-04-29 | 中国电力科学研究院有限公司 | Direct current chopper circuit control system, method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103166490B (en) | System and method of feed forward for boost converters with improved power factor and reduced energy storage | |
| CN103580000B (en) | Switching Power Supply output over-voltage protection method and circuit and the Switching Power Supply with this circuit | |
| CN105978337B (en) | A kind of offset voltage based on COT control models eliminates circuit | |
| CN103001463B (en) | Switch power controller and the Switching Power Supply that comprises this switch power controller | |
| CN104902648B (en) | A kind of LED light adjusting circuits and light-dimming method with controllable silicon | |
| CN101546961B (en) | Method and apparatus for AC to DC power conversion with reduced harmonic current | |
| CN105406713A (en) | High-accuracy and fast-transient response control circuit | |
| CN103219884A (en) | Control circuit and control method of primary side feedback constant current | |
| CN206962700U (en) | Buck converter load current detection circuits without external sampling resistance | |
| CN104201890B (en) | The method of minimum pulse width in controlling switch mode power | |
| CN205356148U (en) | Quick transient response control circuit of high accuracy | |
| CN201230276Y (en) | Synchronous peak value current control mode impulse-width modulation DC/DC converter | |
| CN105027406B (en) | Impulse density D/A converter with slope-compensation function | |
| CN102655371A (en) | Double-pulse cross-cycle modulation method for switching power supply and device thereof | |
| CN106655777A (en) | Switching power supply output cable pressure drop compensating circuit and compensating method | |
| CN103414345A (en) | Negative-high-voltage direct-current integrated power supply for X-ray tube and control method thereof | |
| CN104101764A (en) | Novel inductor current detection circuit applied to DC-DC converter | |
| CN102801340B (en) | Control method and controller for AC-DC converter | |
| CN106026650B (en) | A kind of offset voltage eliminates circuit | |
| CN103472283A (en) | Voltage detection method and circuit and switching power supply with voltage detection circuit | |
| CN103547041B (en) | Led drive circuit | |
| CN105099201A (en) | Micro-power consumption single-ended flyback high-voltage power supply circuit | |
| CN103312198A (en) | Conducting time compensation for switch power converter | |
| CN103533710B (en) | A kind of LED driver | |
| CN103401403A (en) | Inductance charging charge control method and application of control method in switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131120 |
|
| RJ01 | Rejection of invention patent application after publication |