CN102761259A - Voltage regulator and system and method for controlling turn-on time in fixed-frequency manner - Google Patents
Voltage regulator and system and method for controlling turn-on time in fixed-frequency manner Download PDFInfo
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- CN102761259A CN102761259A CN2011101098874A CN201110109887A CN102761259A CN 102761259 A CN102761259 A CN 102761259A CN 2011101098874 A CN2011101098874 A CN 2011101098874A CN 201110109887 A CN201110109887 A CN 201110109887A CN 102761259 A CN102761259 A CN 102761259A
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Abstract
The invention relates to a system and a method for controlling turn-on time in a fixed-frequency manner. The system and the method are applied to a voltage regulator. Leading-in time span for inputting voltage is determined according to the turn-on time, so that the voltage regulator regulates output voltage. The system for controlling the turn-on time in the fixed-frequency manner comprises a fixed-frequency turn-on time control circuit and a frequency setting and parameter adjusting circuit, and the fixed-frequency turn-on time control circuit sets the turn-on time according to a system duty cycle of the voltage regulator and frequency setting parameters. The frequency setting and parameter adjusting circuit generates frequency setting and parameter adjusting values according to the length of closing time, and computation is carried out according to the frequency setting and parameter adjusting values and the preset frequency setting parameters so as to generate frequency setting parameters. The frequency setting and parameter adjusting circuit changes computation results by the frequency setting and parameter adjusting values to change the frequency setting parameters when the closing time is shorter than a reference value. The system and the method for controlling the turn-on time in the fixed-frequency manner can avoid the problem that output voltage is decreased when the minimum closing time is set in the prior art.
Description
Technical field
The present invention relates to power regulator or transducer, relate in particular to and decide frequency formula ON time control system, method and voltage regulator.
Background technology
Please refer to Figure 1A, it is a kind of fixedly ON time (constant ON-time, voltage regulator COT) in the prior art.Voltage regulator 100 among Figure 1A comprises feedback circuit 111, error comparator CMP, ON time control circuit (ON-time control circuit) 113, driving and power circuit (driver & power stage) 130 and output filter circuit (output filter) 150; At this, error comparator CMP and ON time control circuit 130 constitute fixedly ON time control system.Particularly; The value of feedback VFB and the size between the reference voltage VREF of the output voltage that error comparator CMP comparison feedback circuit 111 provides produce output voltage logical signal COMP; Produce shut-in time and ON time TON and inform driving and power circuit 130 according to transition time of output voltage logical signal COMP by ON time control circuit 113; Control the inductive current IL in the output filter circuit 150 by driving and power circuit 130 according to the time span that received ON time TON decision input voltage VIN is directed in it afterwards, and then regulate output voltage VO UT.Figure 1B be drive among Figure 1A and power circuit 130 in power unit 1302; Driving and power circuit 130 can produce PWM signal VPWM according to ON time TON, with ON time and the shut-in time (equaling the time interval between adjacent two ON times) of determine switch transistor HS-MOS; And the switching transistor HS-MOS and the LS-MOS alternate conduction that are connected in series each other.
Fixedly ON time control system shown in Figure 1A has circuit simply, not to be needed compensating circuit and reacts advantage fast; Its shortcoming then is that operating frequency is unfixing; Also therefore there are many methods to be developed; So that fixedly the ON time control system reaches and decides frequency, the voltage regulator 200 of deciding frequency formula (constant frequency) ON time for example shown in Figure 2.
As shown in Figure 2, voltage regulator 200 comprises feedback circuit 211, error comparator CMP, the fixed control circuit of formula ON time frequently 213, driving and power circuit 230 and output filter circuit 250; At this, error comparator CMP constitutes the fixed control system of formula ON time frequently with the fixed control circuit of formula ON time frequently 213.Wherein, The fixed control circuit of formula ON time frequently 213 utilizes input voltage VIN and output voltage VO UT to cooperate predetermined frequencies setup parameter FSET0 to export corresponding ON time TON again in the hope of system responsibility cycle (Duty) (for example being the responsibility cycle of the PWM signal VPWM among Figure 1B) of voltage regulator 200 or approximate system responsibility periodic quantity (to equal VOUT/ (VIN * FSET0) or Duty * (1/FSET0) or Duty * (1/FSET0) approximation) to driving and power circuit 230, the operating frequency of deciding frequency formula ON time control system is equaled or be approximately equal to the pairing frequency of predetermined frequencies setup parameter FSET0; Shut-in time then is that relatively the value of feedback VFB and the reference voltage VREF of output voltage come decision automatically through error comparator CMP.
Yet, when side circuit is realized, have the restriction of minimum shut-in time, that is must keep the shut-in time and be not less than a certain minimum shut-in time; Therefore; The pairing shut-in time of ON time TON of deciding 213 generations of frequency formula ON time control circuit in Fig. 2 is less than the minimum shut-in time; System can be because the restriction of minimum shut-in time will be maintained at the minimum shut-in time shut-in time, and the PWM control signal that makes ON time TON that this moment, fixed formula ON time frequently control circuit was produced and minimum shut-in time synthesize can't be kept output voltage VO UT at accurate that sets and cause its decline.
Summary of the invention
Therefore, the present invention provides a kind of fixed control system of formula ON time frequently, to avoid in the prior art problem that output voltage descends when suffering from minimum shut-in time restriction.
The present invention provides a kind of fixed control method of formula ON time frequently in addition, to avoid in the prior art problem that output voltage descends when suffering from minimum shut-in time restriction.
The present invention provides a kind of voltage regulator that is suitable for above-mentioned control system and control method again, to avoid in the prior art problem that output voltage descends when suffering from minimum shut-in time restriction.
For reaching above-mentioned purpose, the present invention proposes a kind of fixed control system of formula ON time frequently, is suitable for being applied to voltage regulator.Voltage regulator in the present embodiment is regulated output voltage according to the time span that ON time decision input voltage is directed in the voltage regulator.Particularly, the fixed control system of formula ON time frequently comprises and decides frequency formula ON time control circuit and frequency setting parameter adjustment circuit; The fixed control circuit of formula ON time frequently is according to the approximation and the above-mentioned ON time of frequency setting parameter setting in the system responsibility cycle (for example being tried to achieve by input voltage and output voltage) or the system responsibility cycle of voltage regulator; Frequency setting parameter adjustment circuit produces frequency setting parameter adjustment value according to size voltage regulator and the corresponding shut-in time of ON time, and carries out the above-mentioned frequency setting parameter of computing generation according to frequency setting parameter adjustment value and predetermined frequencies setup parameter.Wherein, frequency setting parameter adjustment circuit utilizes during reference value frequency setting parameter adjustment value to change operation result in the shut-in time less than the shut-in time to change the frequency setting parameter to increase ON time.
In one embodiment of the invention, described frequency setting parameter adjustment circuit can comprise error amplifier, low pass filter, polarity selecting circuit and counting circuit.Error amplifier is according to the control voltage of representing the shut-in time and represent the difference output error amplifying signal between the reference voltage of shut-in time reference value, and this error amplification signal has particular polarity in the shut-in time during reference value less than the shut-in time; Low pass filter carries out low-pass filtering treatment to above-mentioned error amplification signal; The error amplification signal output frequency setup parameter adjusted value of polarity selecting circuit after according to LPF, and when the error amplification signal behind the LPF has above-mentioned particular polarity, to make frequency setting parameter adjustment value be non-zero; Counting circuit carries out computing and produces the frequency setting parameter for the use of the fixed control circuit of formula ON time frequently predetermined frequencies setup parameter and frequency setting parameter adjustment value.
In one embodiment of the invention, described frequency setting parameter adjustment circuit also can comprise the time to electric pressure converter, will convert above-mentioned control voltage the shut-in time to.
In one embodiment of the invention; The described fixed control system of formula ON time frequently also can comprise error comparator, with value of feedback and another reference voltage according to output voltage the usefulness of output voltage logical signal for the fixed control circuit decision shut-in time of formula ON time frequently is provided.
The frequency formula ON time control method of deciding that the embodiment of the invention proposes is suitable for being applied to voltage regulator.Voltage regulator in the present embodiment can be regulated output voltage according to the time span that ON time determines input voltage to be directed in the voltage regulator.Particularly, the fixed control method of formula ON time frequently comprises step: according to the approximation and the above-mentioned ON time of frequency setting parameter setting in the system responsibility cycle (for example being tried to achieve by input voltage and output voltage) or the system responsibility cycle of voltage regulator; When voltage regulator with the corresponding shut-in time of ON time less than shut-in time during reference value, change the frequency setting parameter to increase ON time.Further, can also work as the shut-in time to be not less than the shut-in time during reference value, the holding frequency setup parameter is constant.
In one embodiment of the invention; Described when voltage regulator and the corresponding shut-in time of ON time change the frequency setting parameter during reference value less than the shut-in time and can comprise with the step that increases ON time: according to the control voltage of representing the shut-in time and represent the difference output error method signal between the reference voltage of shut-in time reference value; At this, error amplification signal has particular polarity in the shut-in time during reference value less than the shut-in time; Error amplification signal is carried out low-pass filtering treatment; The frequency setting parameter adjustment value of output non-zero when the error amplification signal behind the LPF has above-mentioned particular polarity; And utilize the frequency setting parameter adjustment value of non-zero to change the frequency setting parameter.
In one embodiment of the invention, the described fixed control method of formula ON time frequently also can comprise step: according to the value of feedback of output voltage and the difference between another reference voltage the output voltage logical signal is provided; And according to the above-mentioned shut-in time of output voltage logical signal decision.
A kind of voltage regulator that the embodiment of the invention proposes comprises driving and power circuit, fixed formula ON time control circuit and frequency setting parameter adjustment circuit frequently; Wherein, driving and power circuit are regulated output voltage according to the time span that ON time decision input voltage is directed in driving and the power circuit; The fixed control circuit of formula ON time frequently is according to the approximation and the above-mentioned ON time of frequency setting parameter setting in the system responsibility cycle (for example being tried to achieve by input voltage and output voltage) or the system responsibility cycle of voltage regulator; Frequency setting parameter adjustment circuit basis produces frequency setting parameter adjustment value with the size of above-mentioned corresponding shut-in time of ON time, and whether changes above-mentioned frequency setting parameter through the decision of frequency setting parameter adjustment value.Moreover, the shut-in time less than the shut-in time during reference value frequency setup parameter adjusted value be that non-zero makes the frequency setting parameter be changed.
The embodiment of the invention is through providing frequency setting parameter adjustment circuit; So that when shut-in time during less than shut-in time reference value (circuit can be set to the minimum shut-in time greater than system when realizing); Downgrade the size of frequency setting parameter with the adjustment ON time, and then the problem that descends of the output voltage that can avoid when meeting with the restriction of minimum shut-in time, being caused.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification, and for let of the present invention above-mentioned with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Figure 1A is the electrical block diagram of the voltage regulator of a kind of fixedly ON time in the prior art.
Figure 1B is driving and the electrical block diagram of the power unit in the power circuit among Figure 1A.
Fig. 2 is a kind of fixed electrical block diagram of the voltage regulator of formula ON time frequently in the prior art.
Fig. 3 is a kind of fixed electrical block diagram of the voltage regulator of formula ON time frequently of embodiment provided by the present invention.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; Decide frequency formula ON time control system and method and its embodiment of voltage regulator, method, step, structure, characteristic and effect to what propose according to the present invention, specify as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can clearly appear in following the cooperation in the graphic preferred embodiment detailed description of reference.Through the explanation of embodiment, can be to reach technological means that predetermined purpose takes and effect to have one more deeply and concrete understanding to the present invention, yet the appended graphic usefulness that only provides reference and explanation be not to be used for the present invention is limited.
Please refer to Fig. 3, it is a kind of fixed electrical block diagram of the voltage regulator of formula ON time frequently of embodiment provided by the present invention.As shown in Figure 3, voltage regulator 300 comprises feedback circuit 311, error comparator CMP, the fixed control circuit of formula ON time frequently 313, frequency setting parameter adjustment circuit 315, driving and power circuit 330 and output filter circuit 350; At this, error comparator CMP, the fixed control circuit 313 of formula ON time frequently and frequency setting parameter adjustment circuit 315 constitute decides frequency formula ON time control system in the present embodiments.
In the present embodiment; Feedback circuit 311, error comparator CMP, driving and power circuit 330 and output filter circuit 350 are basic identical with feedback circuit, error comparator, driving and power circuit and output filter circuit among Figure 1A and Fig. 2, so repeat no more at this.
The frequency formula ON time control circuit 313 of deciding in the present embodiment produces ON time TON according to input voltage VIN and output voltage VO UT in the hope of the responsibility cycle (Duty) (for example being the responsibility cycle of PWM signal VPWM among Figure 1B) of system or the approximation in system responsibility cycle and frequency setting parameter F SET; TON=VOUT/ (the approximation of VIN * FSET) or Duty * (1/FSET) or Duty * (1/FSET), and decide the shut-in time TOFF corresponding for example with ON time TON according to the output voltage logical signal COMP that exports behind the value of feedback VFB of error comparator CMP through output voltage relatively and the reference voltage VREF.Need to prove at this, the system responsibility cycle to ask for mode a lot, be not limited to utilize output voltage and input voltage to be divided by and try to achieve.Drive and power circuit 330 from the fixed control circuit of formula ON time frequently 313 know decision input voltage VIN behind the ON time TON be directed into drive and power circuit 330 in time span, regulate output voltage VO UT.
Hold above-mentionedly, frequency setting parameter adjustment circuit 315 comprises that the time is to electric pressure converter (time to voltage converter), error amplifier EA, low-pass filter circuit 3152, polarity selecting circuit 3154 and counting circuit 3156.
Wherein, the time converts the control voltage VOFF that represents shut-in time TOFF to the shut-in time TOFF of the fixed formula ON time frequently of electric pressure converter 3150 receptions control circuit 313 outputs and with shut-in time TOFF.Error amplifier EA receives control voltage VOFF and represents the shut-in time reference value (at this; The shut-in time reference value is set to the minimum shut-in time greater than system) reference voltage VOFF (set), and according to the difference output error amplifying signal Sdif between control voltage VOFF and the reference voltage VOFF (set); At this, error amplification signal Sdif has positive polarity at control voltage VOFF during greater than reference voltage VOFF (set) (corresponding shut-in time TOFF is less than the shut-in time reference value), that is this moment Sdif 0; Otherwise, Sdif≤0.3152 couples of error amplification signal Sdif of low-pass filter circuit carry out exporting polarity selecting circuit 3154 to after the low-pass filtering treatment, produce frequency setting parameter adjustment value Scon by polarity selecting circuit 3154 according to the error amplification signal Sdif behind the LPF.More specifically; As error amplification signal Sdif>0; Then polarity selecting circuit 3154 can be made as non-zero (that is Scon>0) with frequency setting parameter adjustment value Scon; And when error amplification signal Sdif≤0, then polarity selecting circuit 3154 can be made as zero (that is Sdif=0) with frequency setting parameter adjustment value Scon.Afterwards; Counting circuit 3156 can carry out computing to received predetermined frequencies setup parameter FSET0 and frequency setting parameter adjustment value Scon; And supply the fixed control circuit of formula ON time frequently 313 to use as frequency setting parameter F SET the operation result; That is FSET=α FSET0-β Scon, wherein the simple form of α and β is 1, but also can be set at other numerical value.
Can know from the computing formula (FSET=α FSET0-β Scon) of the frequency setting parameter F SET of present embodiment: shut-in time TOFF less than the shut-in time during reference value frequency setup parameter adjusted value Scon be that non-zero makes frequency setting parameter F SET for example be changed to downgrade, and shut-in time TOFF be not less than the shut-in time during reference value frequency setup parameter adjusted value Scon zero make frequency setting parameter F SET remain unchanged; Therefore the problem that the output voltage that can avoid in the prior art when meeting with minimum shut-in time restriction, being caused descends.
In sum; The embodiment of the invention is through providing frequency setting parameter adjustment circuit; So that downgrade the size of frequency setting parameter during less than shut-in time reference value (circuit can be set to the minimum shut-in time greater than system when realizing) with adjustment (for example increasing) ON time when the shut-in time, and then the problem that descends of the output voltage that can avoid when meeting with the restriction of minimum shut-in time, being caused.
In addition; Those skilled in the art can do suitably change design to the circuit structure of the voltage regulator in the above embodiment of the present invention; For example change the internal structure of frequency setting parameter adjustment circuit, as long as can reach the purpose that downgrades the frequency setting parameter at shut-in time TOFF less than the shut-in time during reference value.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with preferred embodiment; Yet be not in order to limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (12)
1. decide formula ON time control system frequently for one kind; Be applied to voltage regulator; Said voltage regulator is regulated an output voltage according to the time length that an ON time determines an input voltage to be directed in the said voltage regulator, it is characterized in that: the said fixed control system of formula ON time frequently comprises:
Certain control circuit of formula ON time frequently is according to a system responsibility cycle and the said ON time of a frequency setting parameter setting of said voltage regulator; And
One frequency setting parameter adjustment circuit; Produce a frequency setting parameter adjustment value according to said voltage regulator and the size of a corresponding shut-in time of said ON time; And carry out computing according to said frequency setting parameter adjustment value and a predetermined frequencies setup parameter and produce said frequency setting parameter
Wherein, said frequency setting parameter adjustment circuit utilizes during reference value said frequency setting parameter adjustment value to change operation result in the said shut-in time less than a shut-in time to change said frequency setting parameter to increase said ON time.
2. the fixed control system of formula ON time frequently according to claim 1, it is characterized in that: said frequency setting parameter adjustment circuit comprises:
One error amplifier; Control voltage according to the said shut-in time of representative is exported an error amplification signal with the difference between the reference voltage of representing said shut-in time reference value, and said error amplification signal has a particular polarity in the said shut-in time during reference value less than said shut-in time;
One low pass filter carries out low-pass filtering treatment to said error amplification signal;
One polarity selecting circuit is exported said frequency setting parameter adjustment value according to the error amplification signal behind the LPF, and when the error amplification signal behind the said LPF has said particular polarity, to make said frequency setting parameter adjustment value be non-zero; And
One counting circuit carries out computing and produces said frequency setting parameter for the use of the said fixed control circuit of formula ON time frequently said predetermined frequencies setup parameter and said frequency setting parameter adjustment value.
3. the fixed control system of formula ON time frequently according to claim 2, it is characterized in that: said frequency setting parameter adjustment circuit also comprises:
One time converted the said shut-in time to said control voltage to electric pressure converter.
4. the fixed control system of formula ON time frequently according to claim 1 is characterized in that: the said fixed control system of formula ON time frequently also comprises:
One error comparator provides an output voltage logical signal to determine the usefulness of said shut-in time for the said fixed control circuit of formula ON time frequently according to a value of feedback of said output voltage and a reference voltage.
5. the fixed control system of formula ON time frequently according to claim 1; It is characterized in that: said computing is FSET=α FSET0-β Scon; FSET represents said frequency setting parameter; FSET0 represents said predetermined frequencies setup parameter, and Scon represents said frequency setting parameter adjustment value, and α and β are constant.
6. decide formula ON time control method frequently for one kind; Be applied to voltage regulator; Said voltage regulator is regulated an output voltage according to the time length that an ON time determines an input voltage to be directed in the said voltage regulator, it is characterized in that: the said fixed control method of formula ON time frequently comprises step:
A system responsibility cycle and the said ON time of a frequency setting parameter setting according to said voltage regulator; And
When said voltage regulator with a corresponding shut-in time of said ON time less than shut-in time during reference value, change said frequency setting parameter to increase said ON time.
7. the fixed control method of formula ON time frequently according to claim 6; It is characterized in that: when said voltage regulator with the corresponding said shut-in time of said ON time less than said shut-in time during reference value, change said frequency setting parameter and comprise with the step that increases said ON time:
Control voltage according to the said shut-in time of representative is exported an error amplification signal with the difference between the reference voltage of representing said shut-in time reference value, and said error amplification signal has a particular polarity in the said shut-in time during reference value less than said shut-in time;
Said error amplification signal is carried out low-pass filtering treatment;
, exports the error amplification signal behind the LPF frequency setting parameter adjustment value of a non-zero when having said particular polarity; And
Utilize the frequency setting parameter adjustment value of said non-zero to change said frequency setting parameter.
8. the fixed control method of formula ON time frequently according to claim 6 is characterized in that: the said fixed control method of formula ON time frequently also comprises step:
A value of feedback and the difference between the reference voltage according to said output voltage provide an output voltage logical signal; And
Determine the said shut-in time according to said output voltage logical signal.
9. voltage regulator is characterized in that: comprising:
One drives and power circuit, regulates an output voltage according to the time length that an ON time determines an input voltage to be directed in said driving and the power circuit;
Certain control circuit of formula ON time frequently is according to a system responsibility cycle and the said ON time of a frequency setting parameter setting of said voltage regulator; And
One frequency setting parameter adjustment circuit produces a frequency setting parameter adjustment value according to the size with a corresponding shut-in time of said ON time, and whether changes said frequency setting parameter through said frequency setting parameter adjustment value decision;
Wherein, the said shut-in time less than a shut-in time during reference value said frequency setting parameter adjustment value be that non-zero makes said frequency setting parameter be changed.
10. voltage regulator according to claim 9 is characterized in that: said frequency setting parameter adjustment circuit comprises:
One error amplifier; Control voltage according to the said shut-in time of representative is exported an error amplification signal with the difference between the reference voltage of representing said shut-in time reference value, and said error amplification signal has a particular polarity in the said shut-in time during reference value less than said shut-in time;
One low pass filter carries out low-pass filtering treatment to said error amplification signal;
One polarity selecting circuit is exported said frequency setting parameter adjustment value according to the error amplification signal behind the LPF, and when the error amplification signal behind the said LPF has said particular polarity, to make said frequency setting parameter adjustment value be non-zero; And
One counting circuit carries out computing and obtains said frequency setting parameter for the use of the said fixed control circuit of formula ON time frequently a predetermined frequencies setup parameter and said frequency setting parameter adjustment value.
11. voltage regulator according to claim 9 is characterized in that: said voltage regulator also comprises:
One error comparator provides an output voltage logical signal to determine the usefulness of said shut-in time for the said fixed control circuit of formula ON time frequently according to a value of feedback of said output voltage and a reference voltage.
12. voltage regulator according to claim 9 is characterized in that: the said system responsibility cycle is to utilize said input voltage and output voltage to try to achieve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110109887.4A CN102761259B (en) | 2011-04-29 | 2011-04-29 | Voltage regulator and system and method for controlling turn-on time in fixed-frequency manner |
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| CN201110109887.4A CN102761259B (en) | 2011-04-29 | 2011-04-29 | Voltage regulator and system and method for controlling turn-on time in fixed-frequency manner |
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| CN102761259B CN102761259B (en) | 2015-02-18 |
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Cited By (4)
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| CN105322766A (en) * | 2014-06-13 | 2016-02-10 | 立锜科技股份有限公司 | Constant ON-time or constant OFF-time switching power converter and control circuit thereof |
| CN108227803A (en) * | 2016-12-22 | 2018-06-29 | 苏州普源精电科技有限公司 | A kind of simulator of dynamic load electric current |
| CN110098735A (en) * | 2016-08-31 | 2019-08-06 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit |
| CN112398314A (en) * | 2020-10-22 | 2021-02-23 | 杰华特微电子（杭州）有限公司 | Frequency control method and control circuit of switching circuit and switching power supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105322766A (en) * | 2014-06-13 | 2016-02-10 | 立锜科技股份有限公司 | Constant ON-time or constant OFF-time switching power converter and control circuit thereof |
| CN105322766B (en) * | 2014-06-13 | 2018-09-07 | 立锜科技股份有限公司 | Fixed conducting or fixed shut-in time switched power supply and its control circuit |
| CN110098735A (en) * | 2016-08-31 | 2019-08-06 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit |
| CN110098735B (en) * | 2016-08-31 | 2020-10-09 | 杰华特微电子（杭州）有限公司 | Control method of switch circuit |
| CN108227803A (en) * | 2016-12-22 | 2018-06-29 | 苏州普源精电科技有限公司 | A kind of simulator of dynamic load electric current |
| CN108227803B (en) * | 2016-12-22 | 2020-11-13 | 普源精电科技股份有限公司 | Simulator for dynamic load current |
| CN112398314A (en) * | 2020-10-22 | 2021-02-23 | 杰华特微电子（杭州）有限公司 | Frequency control method and control circuit of switching circuit and switching power supply |
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| Publication number | Publication date |
|---|---|
| CN102761259B (en) | 2015-02-18 |
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