CN103095103A - Frequency regulation control circuit capable of achieving curvature frequency-reduction with changes of loads in switching power supply - Google Patents
Frequency regulation control circuit capable of achieving curvature frequency-reduction with changes of loads in switching power supply Download PDFInfo
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- CN103095103A CN103095103A CN2013100162995A CN201310016299A CN103095103A CN 103095103 A CN103095103 A CN 103095103A CN 2013100162995 A CN2013100162995 A CN 2013100162995A CN 201310016299 A CN201310016299 A CN 201310016299A CN 103095103 A CN103095103 A CN 103095103A
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Abstract
The invention relates to a frequency regulation control circuit capable of achieving curvature frequency-reduction with changes of loads in a switching power supply. The frequency regulation control circuit capable of achieving the curvature frequency-reduction with the changes of the loads in the switching power supply comprises a load detecting module, a under-clocking starting control module, a curvilinear function occurring module and a curvature under-clocking occurring control module. The load detecting module is connected with the curvature under-clocking occurring control module through the under-clocking starting control module and the curvilinear function occurring module in sequence. The frequency regulation control circuit capable of achieving the curvature frequency-reduction with the changes of the loads in the switching power supply is used. When an output signal of the load detecting module is inferior to an under-clocking starting preset voltage, the curvilinear function occurring module is controlled by the work of the under-clocking starting control module to produce a curvilinear function which is relevant to a load condition. Finally, the control of the curvature under-clocking occurring control module work is achieved to produce a frequency changing with the load curve. Thus a fractional load taking into account in the switching power supply and the optimal energy conversion efficiency at the fractional load can be achieved effectively. The frequency regulation control circuit capable of achieving the curvature frequency-reduction with the changes of the loads in the switching power supply is simple and practical in structure, stable and reliable in work performance and wide in application range.
Description
Technical field
The present invention relates to AC/DC switch power technology field, particularly Switching Power Supply is with the frequency adjustment technology field of load variations, specifically refers in a kind of Switching Power Supply to realize that with load variations the frequency of curvature frequency reducing adjusts the control circuit structure.
Background technology
The most of Switching Power Supply of prior art has following three processes substantially with the frequency adjusting method of load variations:
1. when load was heavy duty, Switching Power Supply was carried out work with fixing frequency
2. when load was underloading, the Switching Power Supply operating frequency was with the linear variation of load
3. when load became lighter or unloaded, Switching Power Supply entered skip cycle mode and carries out work
Cause the not high reason of conversion efficiency mainly to comprise switching loss and conduction loss by power tube, switching loss refers to the loss that power tube is opened and shutdown moment produces, the loss that when conduction loss refers to the power tube conducting, electric current produces through the power tube conducting resistance.
Switching loss can be expressed by following formula:
Conduction loss can be expressed by following formula:
Pon＝I
2·R
In load is in or when heavy duty, the power tube current of flowing through is higher, and it is relatively large that conduction loss accounts for the proportion of overall losses; When load is in underloading, the electric current of power tube of flowing through reduces, and the conduction loss proportion reduces to some extent, by above-mentioned switching loss expression formula as can be known, cause unnecessary switching loss if still adopt this moment higher frequency to carry out the work meeting, greatly affect power supply conversion efficiency; When load becomes lighter or unloaded, enter skip cycle mode and can further reduce switching loss.
In sum, in carry or conduction loss accounts for overall losses during heavy duty proportion larger, during underloading, to account for the proportion of overall losses larger for switching loss.
The prior art operating frequency is with the substantially linear variation of load variations at present, according to notebook adapters actual measurement energy conversion efficiency and corresponding frequency data analysis, the proportion that switching loss accounts for overall losses is not with the linear variation of load, the optimal energy conversion efficiency when single linear change frequency reducing curve can't be taken into account middle underloading and underloading simultaneously.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of optimal energy conversion efficiency, simple and practical, stable and reliable working performance, the scope of application can effectively take into account underloading and underloading in Switching Power Supply the time to realize that with load variations the frequency of curvature frequency reducing adjusts the control circuit structure in Switching Power Supply comparatively widely.
In order to realize above-mentioned purpose, realize that with load variations the frequency adjustment control circuit structure of curvature frequency reducing has following formation in Switching Power Supply of the present invention:
Realize the frequency adjustment control circuit structure of curvature frequency reducing in this Switching Power Supply with load variations, its main feature is, described circuit structure comprises that load detecting module, frequency reducing open control module, curvilinear function generation module and curvature frequency reducing generation control module, and described load detecting module is opened control module by described frequency reducing successively and is connected with described curvature frequency reducing generation control module with curvilinear function generation module.
Realize that with load variations the load detecting module that the frequency of curvature frequency reducing is adjusted in the control circuit structure is load voltage state sampling module in this Switching Power Supply, the voltage output end of this load voltage state sampling module is opened control module with described frequency reducing and is connected.
Realizing the frequency of curvature frequency reducing adjusting frequency reducing in the control circuit structure with load variations in this Switching Power Supply, to open control module be subtractor unit, the voltage output end of described load voltage state sampling module is connected with the first input end of described subtractor unit, the second input of described subtractor unit is connected with frequency reducing pattern predeterminated voltage end, and the output of described subtractor unit is connected with described curvilinear function generation module.
Realize that with load variations the curvilinear function generation module that the frequency of curvature frequency reducing is adjusted in the control circuit structure comprises multiplier unit and current source in this Switching Power Supply, the output of described subtractor unit is connected with the input of described multiplier unit, and the output of this multiplier unit is connected with the control end of described current source, the input of this current source is connected with power supply, and the output of this current source is connected with described curvature frequency reducing generation control module.
realize that with load variations the curvature frequency reducing generation control module that the frequency of curvature frequency reducing is adjusted in the control circuit structure comprises electric capacity in this Switching Power Supply, the first comparator and the second comparator, the first end ground connection of described electric capacity, the second end of this electric capacity is connected with the negative terminal of described the first comparator and the anode of described the second comparator respectively, the second end of described electric capacity is connected with power supply with the first constant-current source by the first switch of serial connection successively, and the second end of this electric capacity is the second switch by being connected in series successively, the second constant-current source and the 3rd constant-current source ground connection, the output of described current source is connected between described the second constant-current source and the 3rd constant-current source by the 3rd switch, the anode of described the first comparator is connected with the first default comparative voltage end, and the output of this first comparator is controlled the on off state of described the first switch by the first NAND gate unit with gate cell successively, the negative terminal of described the second comparator is connected with the second default comparative voltage end, and the output of this second comparator is connected by the input of the second NAND gate unit with described the first NAND gate unit, the output of this first NAND gate unit is connected with the input of described the second NAND gate unit, and the output of this first NAND gate unit is controlled the on off state of described second switch and the 3rd switch.
adopted in the Switching Power Supply of this invention with load variations and realized that the frequency of curvature frequency reducing adjusts the control circuit structure, owing to wherein detecting the load status by the load detecting module, when the load detecting module output signal is opened predeterminated voltage lower than frequency reducing, frequency reducing is opened control module job control curvilinear function generation module and is produced the curvilinear function relevant to load condition, the final frequency that realizes that control curvature frequency reducing generation module work generation changes with load curve, thereby the optimal energy conversion efficiency when having realized effectively taking into account underloading and underloading in Switching Power Supply, and simple and practical, stable and reliable working performance, the scope of application is comparatively extensive.
Description of drawings
Fig. 1 realizes the curvature frequency reducing control principle schematic diagram of the frequency adjustment control circuit structure of curvature frequency reducing with load variations in Switching Power Supply of the present invention.
Fig. 2 realizes that with load variations the frequency of curvature frequency reducing adjusts the saw-toothed oscillator schematic diagram that the constant-current source in the control circuit structure produces capacitor charge and discharge in Switching Power Supply of the present invention.
Fig. 3 realizes that with load variations the frequency of curvature frequency reducing adjusts the concrete control principle drawing of curvature frequency reducing in the control circuit structure in Switching Power Supply of the present invention.
Fig. 4 realizes that with load variations the frequency of curvature frequency reducing adjusts the frequency curve of control circuit structure with the load variations schematic diagram in Switching Power Supply of the present invention.
Embodiment
In order more clearly to understand technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 1, realize that with load variations the load detecting module that the frequency of curvature frequency reducing is adjusted in the control circuit structure is load voltage state sampling module 300 in this Switching Power Supply, the voltage output end of this load voltage state sampling module 300 is opened control module with described frequency reducing and is connected.
Wherein, it is subtractor unit 301 that control module is opened in described frequency reducing, the voltage output end of described load voltage state sampling module 300 is connected with the first input end of described subtractor unit 301, the second input of described subtractor unit 301 is connected with frequency reducing pattern predeterminated voltage end Vref3, and the output of described subtractor unit 301 is connected with described curvilinear function generation module.
Simultaneously, described curvilinear function generation module comprises multiplier unit 302 and current source 303, the output of described subtractor unit 301 is connected with the input of described multiplier unit 302, and the output of this multiplier unit 302 is connected with the control end of described current source 303, the input of this current source 303 is connected with power supply, and the output of this current source 303 is connected with described curvature frequency reducing generation control module.
moreover, described curvature frequency reducing generation control module comprises electric capacity 310, the first comparator 311 and the second comparator 312, the first end ground connection of described electric capacity 310, the second end of this electric capacity 310 is connected with the negative terminal of described the first comparator 311 and the anode of described the second comparator 312 respectively, the second end of described electric capacity 310 is connected with power supply with the first constant-current source 305 by the first switch 306 of serial connection successively, and the second end of this electric capacity 310 is the second switch 307 by being connected in series successively, the second constant-current source 308 and the 3rd constant-current source 309 ground connection, the output of described current source 303 is connected between described the second constant-current source 308 and the 3rd constant-current source 309 by the 3rd switch 304, the anode of described the first comparator 311 is connected with the first default comparative voltage end Vref1, and the output of this first comparator 311 is controlled the on off state of described the first switch 306 by the first NAND gate unit with gate cell successively, the negative terminal of described the second comparator 312 is connected with the second default comparative voltage end Vref2, and the output of this second comparator 312 is connected by the input of the second NAND gate unit with described the first NAND gate unit, the output of this first NAND gate unit is connected with the input of described the second NAND gate unit, and the output of this first NAND gate unit is controlled the on off state of described second switch 307 and the 3rd switch 304.
In the middle of reality is used, see also shown in Figure 1, wherein control schematic diagram for the curvature frequency reducing, detect the load status by load detecting module 100, when load detecting module 100 output signals are opened predeterminated voltage lower than frequency reducing, frequency reducing is opened control module 101 job control curvilinear function generation modules 102 and is produced the curvilinear function relevant to load condition, finally controls 103 work of curvature frequency reducing generation module and produces the frequency that changes with load curve.
see also again shown in Figure 2, it is the saw-toothed oscillator that constant-current source produces capacitor charge and discharge, its operation principle is: initial condition electric capacity 204 level equal the second default comparative level Vref2 of comparator 206, logical signal X controls second switch 202 and disconnects, meanwhile logical signal Y controls the first switch 201 closures, the first 200 pairs of constant-current sources electric capacity, 204 chargings, when electric capacity 204 level reach the first comparator 205 default comparative level Vref1, logical signal Y controls the first switch 201 and disconnects, meanwhile logical signal X controls second switch 202 closures, the second 203 pairs of constant-current sources electric capacity, 204 discharges are until level drops to the second default comparative level Vref2 of comparator 206, so far complete a complete cycle of oscillation, charging interval:
Tr＝C（Vref1－Vref2）/I
201；
Discharge time:
Tf＝C（Vref1－Vref2）/I
203
Therefore this sawtooth waveforms cycle of oscillation:
T＝Tr＋Tf＝C（Vref1－Vref2）/I
201＋C（Vref1－Vref2）/I
203。
Fig. 3 is curvature frequency reducing control principle schematic diagram, its principle is: when load lightens, obtain load condition sampled signal Vs by load detecting module 300, as sampled signal Vs during lower than frequency reducing pattern preset value Vref3, sampled signal VS and frequency reducing preset value Vref3 do multiplying through multiplication module 302 after doing subtraction through subtracter block 301 again, and the signal controlling current source 303 after computing produces the electric current that become parabola increase progressively relevant to load:
I
303＝K×（Vs－Vref）
2；
Oscillator is initial, logical signal X controls second switch 307 and the 3rd switch 304 disconnects, meanwhile logical signal Y controls the first switch 306 closures, 310 chargings of 305 pairs of electric capacity of constant-current source, when electric capacity 310 level reach the first comparator 311 default comparative level, logical signal Y controls the first switch 306 and disconnects, meanwhile logical signal X controls second switch 307 and the 3rd switch 304 closures, 310 discharges of 308 pairs of electric capacity of constant-current source are until electric capacity 310 level drop to the second default comparative level of comparator 312, and the discharging current of this moment is:
I
308＝I
309－I
303＝I
309－K×（Vs－Vref）
2；
This electric current becomes parabola to change with load, and following relation is arranged:
Tr＝C（Vref1－Vref2）/I
305；
Tf＝C（Vref1－Vref2）/I
308＝C（Vref1－Vref2）/（I
309－K×（Vs－Vref）
2）；
Cycle of oscillation:
T＝C（Vref1－Vref2）/I
305＋C（Vref1－Vref2）/（I
309－K×（Vs－Vref）
2）；
Can know from expression formula, along with load lighten gradually the concussion cycle T increase with curve form, namely frequency reduces with curve form.
adopted the frequency adjustment control circuit structure that realizes the curvature frequency reducing in above-mentioned Switching Power Supply with load variations, owing to wherein detecting the load status by the load detecting module, when the load detecting module output signal is opened predeterminated voltage lower than frequency reducing, frequency reducing is opened control module job control curvilinear function generation module and is produced the curvilinear function relevant to load condition, the final frequency that realizes that control curvature frequency reducing generation module work generation changes with load curve, thereby the optimal energy conversion efficiency when having realized effectively taking into account underloading and underloading in Switching Power Supply, and simple and practical, stable and reliable working performance, the scope of application is comparatively extensive.
In this specification, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. realize that with load variations the frequency of curvature frequency reducing adjusts the control circuit structure in a Switching Power Supply, it is characterized in that, described circuit structure comprises that load detecting module, frequency reducing open control module, curvilinear function generation module and curvature frequency reducing generation control module, and described load detecting module is opened control module by described frequency reducing successively and is connected with described curvature frequency reducing generation control module with curvilinear function generation module.
2. realize the frequency adjustment control circuit structure of curvature frequency reducing in Switching Power Supply according to claim 1 with load variations, it is characterized in that, described load detecting module is load voltage state sampling module (300), and the voltage output end of this load voltage state sampling module (300) is opened control module with described frequency reducing and is connected.
3. realize the frequency adjustment control circuit structure of curvature frequency reducing in Switching Power Supply according to claim 2 with load variations, it is characterized in that, it is subtractor unit (301) that control module is opened in described frequency reducing, the voltage output end of described load voltage state sampling module (300) is connected with the first input end of described subtractor unit (301), the second input of described subtractor unit (301) is connected with frequency reducing pattern predeterminated voltage end (Vref3), the output of described subtractor unit (301) is connected with described curvilinear function generation module.
4. realize the frequency adjustment control circuit structure of curvature frequency reducing in Switching Power Supply according to claim 3 with load variations, it is characterized in that, described curvilinear function generation module comprises multiplier unit (302) and current source (303), the output of described subtractor unit (301) is connected with the input of described multiplier unit (302), and the output of this multiplier unit (302) is connected with the control end of described current source (303), the input of this current source (303) is connected with power supply, and the output of this current source (303) is connected with described curvature frequency reducing generation control module.
5. realize the frequency adjustment control circuit structure of curvature frequency reducing in Switching Power Supply according to claim 4 with load variations, it is characterized in that, described curvature frequency reducing generation control module comprises electric capacity (310), the first comparator (311) and the second comparator (312), the first end ground connection of described electric capacity (310), second end of this electric capacity (310) is connected with the negative terminal of described the first comparator (311) and the anode of described the second comparator (312) respectively, the second end of described electric capacity (310) is connected with power supply with the first constant-current source (305) by first switch (306) of serial connection successively, and second end of this electric capacity (310) is the second switch (307) by being connected in series successively, the second constant-current source (308) and the 3rd constant-current source (309) ground connection, the output of described current source (303) is connected between described the second constant-current source (308) and the 3rd constant-current source (309) by the 3rd switch (304), the anode of described the first comparator (311) is connected with the first default comparative voltage end (Vref1), and the output of this first comparator (311) is controlled the on off state of described the first switch (306) by the first NAND gate unit with gate cell successively, the negative terminal of described the second comparator (312) is connected with the second default comparative voltage end (Vref2), and the output of this second comparator (312) is connected by the input of the second NAND gate unit with described the first NAND gate unit, the output of this first NAND gate unit is connected with the input of described the second NAND gate unit, and the output of this first NAND gate unit is controlled the on off state of described second switch (307) and the 3rd switch (304).
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Cited By (5)
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| CN103607112A (en) * | 2013-12-01 | 2014-02-26 | 西安电子科技大学 | Self-adaptive switching frequency regulator circuit |
| CN103605035A (en) * | 2013-12-02 | 2014-02-26 | 绍兴光大芯业微电子有限公司 | No-load detection circuit structure of self-adaptive switching power supply |
| CN104467365A (en) * | 2014-12-19 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Power supply conversion efficiency indication signal generation circuit and power supply conversion efficiency adjustment circuit |
| CN110957926A (en) * | 2019-11-22 | 2020-04-03 | 深圳南云微电子有限公司 | Light load detection and frequency reduction control method and circuit |
| CN113098272A (en) * | 2021-04-23 | 2021-07-09 | 陕西亚成微电子股份有限公司 | Control method and circuit of switching power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103607112A (en) * | 2013-12-01 | 2014-02-26 | 西安电子科技大学 | Self-adaptive switching frequency regulator circuit |
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| CN110957926A (en) * | 2019-11-22 | 2020-04-03 | 深圳南云微电子有限公司 | Light load detection and frequency reduction control method and circuit |
| CN113098272A (en) * | 2021-04-23 | 2021-07-09 | 陕西亚成微电子股份有限公司 | Control method and circuit of switching power supply |
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