CN101150285A - Power supply topologies with PWM frequency control - Google Patents
Power supply topologies with PWM frequency control Download PDFInfo
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- CN101150285A CN101150285A CNA2007101544949A CN200710154494A CN101150285A CN 101150285 A CN101150285 A CN 101150285A CN A2007101544949 A CNA2007101544949 A CN A2007101544949A CN 200710154494 A CN200710154494 A CN 200710154494A CN 101150285 A CN101150285 A CN 101150285A
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Abstract
A power supply topology with pulse width modulation frequency control allows the use of an inductor with higher inductance in a converter. By controlling the switching frequency of the pulse width modulation signal, the inductor can achieve high efficiency during a light load condition and is also suitable for a heavy load condition.
Description
Technical field
The present invention relates to the electric power management circuit layout, relate in particular to the electric power management circuit layout of (PWM) control that has pulse-width modulation, it can support multiple load level to use.
Background technology
When selecting an inductance in the switching circuit (for example, the step-up/down transducer), that is paid close attention to comprises induction reactance, DC rated current and dc impedance (DCR) value.The DC rated current is an essential characteristic of inductance, and its expression allows to flow through the maximum current of this inductance.The DC rated current is determined by induction reactance, inductor size and winding length and line footpath ratio etc.For given inductor size, the DCR value directly is directly proportional with induction reactance, and DC rated current and induction reactance are inversely proportional to.
For the DC/DC boost converter, its efficient directly is directly proportional with induction reactance in light-load conditions equally.In order to improve its efficient, be necessary to select to have the inductance of higher induction reactance.Yet as mentioned above, induction reactance is high more, and the DC rated current that allows can be low more.Equal the average electric current (maximum load current) of this inductance and 1/2 peak summation through the peak current of inductance to the peak value pulsating current.Similarly, the inductance with higher induction reactance can not satisfy the needs that use under the heavy duty condition.This is because the peak current of process inductance increases significantly along with the increase of average electric current (maximum load current) in the heavy duty condition, and can surpass the DC rated current limit that allows through the electric current of this inductance.So the inductance with higher induction reactance is inappropriate for high electric current/heavy duty condition.
There are at least two kinds of demands when in step-up/down DC/DC transducer, selecting inductance.At first, this inductance must in high current condition, work (peak current of this inductance should in the DC rated current limit range that allows).Secondly, this inductance must have high induction reactance, to obtain high efficiency under low current conditions.Because DC rated current and induction reactance are inversely proportional to, so be difficult to select to satisfy the inductance of above-mentioned two demands.
Summary of the invention
According to one embodiment of present invention, transducer comprises that one produces a generator of a pulse-width signal that is used to control an inductance, and the control circuit that is coupled to this generator, and this control circuit is controlled the switching frequency of this pulse-width signal.In one embodiment, when load current during, select first switching frequency less than the scheduled current level.In one embodiment, when load current during, select second switch frequency greater than first switching frequency greater than the scheduled current level.
Description of drawings
Feature and the benefit of the embodiment that requires will become clear along with the carrying out of following detailed description, and this detailed description combines appended accompanying drawing, and wherein identical Reference numeral is represented identical part, therein:
Fig. 1 shows the structure chart with transducer of pulse width modulation frequency control according to an embodiment of the invention.
Fig. 2 shows another structure chart with transducer of pulse width modulation frequency control according to an embodiment of the invention.
Fig. 3 shows the flow chart of the method that is used to realize the transducer with pulse width modulation frequency control according to an embodiment of the invention.
Fig. 4 A shows the waveform of the electric current of the expression inductance of flowing through according to an embodiment of the invention in light-load conditions.
Fig. 4 B shows the waveform of the electric current of the expression inductance of flowing through according to an embodiment of the invention in the heavy duty condition.
Embodiment
Now embodiments of the invention are carried out detailed reference.When the present invention is described with these embodiment, will be understood that this is not that intention limits the present invention on these embodiment.On the contrary, the invention is intended to cover various variations, modification and equivalent, these are included in by in the defined the spirit and scope of the present invention of claims.
And, in following detailed description of the present invention,, thorough understanding of the present invention illustrated a large amount of specific details for being provided.But a those of ordinary skill of this area can recognize that the present invention can not need these specific detail to implement.In other examples, unnecessarily become unclear in order not make the present invention, well-known method, program, assembly and circuit no longer are described in detail.
In one embodiment, the invention provides a kind of electric power management circuit layout with pulse width modulation frequency control.Advantageously, in one embodiment, the frequency of pulse-width signal can be regulated according to different loading conditions.The foregoing circuit layout allows to use the inductance with higher induction reactance, and it can obtain high efficiency in light-load conditions, and is suitable for the heavy duty condition equally.
Fig. 1 shows the structure chart with transducer 100 of pulse width modulation frequency control according to an embodiment of the invention.As shown in fig. 1, transducer 100 comprises generator 102 (being also referred to as frequency control module), this generator 102 is used to produce a pulse-width signal 132 with control inductance 110, and the control circuit 108 that is coupled to generator 102, this control circuit 108 is used to control the switching frequency of pulse-width signal 132.Inductance 110 is coupled to input 172 and output 170.
Regulate the switching frequency of pulse-width signal 132 according to different loading conditions.Advantageously, when load current (load current 160A and/or load current 160B) during, select the first switching frequency f1 (for example, 1MHz) less than the horizontal I0 of scheduled current.When load current (load current 160A and/or load current 160B) during greater than the horizontal I0 of scheduled current, (for example, 4MHz), it is greater than the first switching frequency f1 to select second switch frequency f 2.
Be subjected to the control of pulse-width signal 132 through the electric current of inductance 110.Therefore, when load current during less than the horizontal I0 of scheduled current, pulsating current reaches the horizontal I of first pulsating current between the peak to peak of inductance 110
SW1When load current during greater than the horizontal I0 of scheduled current, pulsating current reaches the horizontal I of second pulsating current between the peak to peak of inductance 110
SW2, it is less than the horizontal I of first pulsating current
SW1
In one embodiment, control circuit 108 comprises internal control circuit 104 (being also referred to as current control module).Internal control circuit 104 can be operated and be used for monitoring load electric current (160A and 160B), and produces first frequency control signal 126 to generator 102, with the switching frequency of control pulse-width signal 132.
More specifically, in one embodiment, when internal control circuit 104 detects load current (160A and/or 160B) less than the horizontal I0 of scheduled current, first frequency control signal 126 will control generator 102, has the first switching frequency f1 (for example, pulse-width signal 132 1MHz) with generation.In one embodiment, when internal control circuit 104 detects load current (160A and/or 160B) greater than the horizontal I0 of scheduled current, first frequency control signal 126 will control generator 102, (for example has second switch frequency f 2 with generation, pulse-width signal 132 4MHz), this second switch frequency f 2 is greater than the first switching frequency f1.
And internal control circuit 104 can produce the current controling signal (not shown) and give generator 102, the duty ratio that is used to regulate pulse-width signal 132 in one embodiment.
In one embodiment, control circuit 108 comprises external control circuit 106 (being also referred to as digital control module).External control circuit 106 can be operated and be used to receive external control signal, and produces second frequency control signal 124 to generator 102, with the switching frequency of control pulse-width signal 132.
In one embodiment, external control signal can be to pass through I
2The digital controlled signal of C bus transfer, this I
2The C bus comprises clock cable 150A and data signal line 150B.Therefore, the user can be by means of controlling the switching frequency of pulse-width signal 132 by external control signal line (clock cable 150A and data signal line 150B) transmission information.Above-mentioned information can include but not limited to the load current level expected.
Advantageously, between internal control circuit 104 and external control circuit 106, has signal of communication line 130A.In one embodiment, signal of communication line 130A is configured to the message transmission from internal control circuit 104 is arrived external control circuit 106.Above-mentioned information can include but not limited to the switching frequency of load current level and pulse-width signal 132.
As a result, generator 102 receives first frequency control signal 126 and/or second frequency control signal 124, and therefore produces pulse-width signal 132.In one embodiment, the frequency of pulse-width signal 132 can be determined by first frequency control signal 126.In another embodiment, the frequency of pulse-width signal 132 can be determined by second frequency control signal 124.
Therefore, according to one embodiment of present invention, pulse-width signal 132 can be controlled by analog control circuit, and this analog control circuit is an internal control circuit 104, and/or by digital control circuit control, this digital control circuit is an external control circuit 106.
Fig. 2 shows the another structure chart with transducer 200 of pulse width modulation frequency control according to an embodiment of the invention.The mark components identical has similar function among element described herein and Fig. 1, and, hereinafter for succinct and clearly purpose will can not be repeated in this description.
In one embodiment, as shown in Figure 2, generator 102 comprises oscillator 202 and amplifier 204.In one embodiment, generator 202 receives first frequency control signal 126 and/or second frequency control signal 124, and produces ramp signal 212.For example, oscillator 202 can produce to have the first switching frequency f1 (for example, ramp signal 212 1MHz) (for example perhaps has second switch frequency f 2, ramp signal 212 4MHz), this depends on first frequency control signal 126 and/or second frequency control signal 124.
Advantageously, by increasing the switching frequency of ramp signal 212, pulsating current reduces between the peak to peak of inductance 110.More specifically, (for example, 1MHz), then the switching frequency of pulse-width signal 132 also equals the first switching frequency f1 if ramp signal 212 has the first switching frequency f1.Similarly, will reach the horizontal I of first pulsating current through pulsating current between the peak to peak of inductance 110
SW1(for example, 4MHz), then the switching frequency of pulse-width signal 132 also equals second switch frequency f 2 greater than the second switch frequency f 2 of the first switching frequency f1 if ramp signal 212 has.Similarly, will be less than the horizontal I of first pulsating current through pulsating current between the peak to peak of inductance 110
SW1The horizontal I of second pulsating current
SW2
And transducer 200 comprises signal of communication line 130A and signal of communication line 130B.In one embodiment, signal of communication line 130A is configured to the message transmission from internal control circuit 104 is arrived external control circuit 106.Above-mentioned information can include but not limited to the switching frequency of load current level and pulse-width signal 132.In one embodiment, external control module 106 arrives internal control module 104 by signal of communication line 130B with message transmission.Above-mentioned information can include but not limited to the switching frequency and the expectation load current level of oscillator 202.
Fig. 3 shows the flow chart 300 of a kind of method of the transducer that is used to realize to have pulse width modulation frequency control according to an embodiment of the invention.To be described Fig. 3 in conjunction with Fig. 1 and Fig. 2.
In module 302, the numerical value of load current is monitored via feedback path.In one embodiment, internal control circuit 104 monitoring load electric current 160A and load current 160B.In module 304, generator 102 (frequency control module) receive frequency control signal.In one embodiment, the said frequencies control signal can be the first frequency control signal 126 from internal control circuit 104, or from the second frequency control signal 124 of external control circuit 106.
In one embodiment, in module 306, produce ramp signal 212 in response to frequency control signal (first frequency control signal 126 and/or second frequency control signal 124) by oscillator 202.In module 308, can pass through error amplifier 204 control module 104 received current control signals 226 internally.More specifically, in one embodiment, current controling signal 226 is used to determine the duty ratio of pulse-width signal 132, is used for the regulating load electric current.
In module 310, the switching frequency of pulse-width signal 132 is controlled to be regulated.By being made comparisons, ramp signal 212 and current controling signal 226 produce pulse-width signal 132.Similarly, in one embodiment, the frequency of the ramp signal 212 of origin self-oscillation device 202 is determined the switching frequency of pulse-width signal 132.More specifically, when load current (160A and/or 160B) during less than the horizontal I0 of scheduled current, pulse-width signal 132 has the first switching frequency f1.When load current (160A and/or 160B) during greater than the horizontal I0 of scheduled current, pulse-width signal 132 has second switch frequency f 2, and (for example, 4MHz), it is greater than the first switching frequency f1.
In module 312, the peak current of inductance 110 is controlled.More specifically, when load current (160A and/or 160B) during less than the horizontal I0 of scheduled current, pulsating current reaches the first pulsating current I between the peak to peak of inductance 110
SW1When load current (160A and/or 160B) during greater than the horizontal I0 of scheduled current, pulsating current is less than first peak to peak-to-peak pulsating current I between the peak to peak of inductance 110
SW1The second pulsating current I
SW2
Reference table 1 has been expressed the example of inductance characteristic.When inductance increased, the DC rated current will reduce as shown in table 1ly.Can provide higher efficient though have the inductance of higher induction reactance under light-load conditions, the DC rated current of its permission can be lower.For example, two inductance are arranged: inductance A (part number: VLF3012AT-2R2M1R0) with inductance B (part number: VLF3012AT-4R7MR74).The DC rated current (rated current) of inductance A equals 1A.The induction reactance of inductance A equals 2.2 μ H.The DC rated current (rated current) of inductance B equals 0.74A.The induction reactance of inductance B equals 4.7 μ H.The light load efficiency of inductance A equals 67%.The light load efficiency of inductance B equals 82%.In one embodiment, when inductance is operated in the high electric current that is in the 1MHz switching frequency/heavy duty condition following time, the inductance peak current is generally 0.93A.
Electrical characteristics
| Part No. | Induction reactance (μ H) | Induction reactance tolerance (%) | Test frequency (kHz) | DC impedance (Ω) | Rated current (A) * | ||
| Maximum | Representative value | Change maximum based on induction reactance | Based on temperature rising representative value | ||||
| VLF3012AT-1R5N1R2 | 1.5 | ±30 | 100 | 0.068 | 0.059 | 1.2 | 1.6 |
| VLF3012AT-2R2M1R0 | 2.2 | ±20 | 100 | 0.1 | 0.088 | 1.0 | 1.3 |
| VLF3012AT-3R3MR87 | 3.3 | ±20 | 100 | 0.13 | 0.11 | 0.87 | 1.2 |
| VLF3012AT-4R7MR74 | 4.7 | ±20 | 100 | 0.19 | 0.16 | 0.74 | 0.98 |
| VLF3012AT-6R8MR59 | 6.8 | ±20 | 100 | 0.27 | 0.23 | 0.59 | 0.83 |
| VLF3012AT-100MR49 | 10 | ±20 | 100 | 0.41 | 0.36 | 0.49 | 0.67 |
| VLF3012AT-150MR41 | 15 | ±20 | 100 | 0.62 | 0.54 | 0.41 | 0.54 |
| VLF3012AT-220MR33 | 22 | ±20 | 100 | 0.76 | 0.66 | 0.33 | 0.49 |
| VLF3012AT-330MR27 | 33 | ±20 | 100 | 1.3 | 1.1 | 0.27 | 0.38 |
| VLF3012AT-470MR22 | 47 | ±20 | 100 | 2.2 | 1.9 | 0.22 | 0.29 |
Table 1
Advantageously, according to one embodiment of present invention, inductance B can be used for obtaining higher efficient.More specifically, in high electric current/heavy duty condition, can increase switching frequency, with electric current between the peak to peak that reduces inductance B.For example, in one embodiment, in high electric current/heavy duty condition, switching frequency can be increased to 4MHz.Similarly, in high electric current/heavy duty condition, pulsating current can be reduced in DC rated current (0.74A) scope that is reduced to permission between the peak to peak of inductance B.Therefore, in the present embodiment, the switching frequency by according to different loading condition control pulse-width signals can replace inductance A with inductance B.
Fig. 4 A shows the waveform 302A that is illustrated in the electric current of the inductance B that flows through in the light-load conditions according to an embodiment of the invention.In conjunction with Fig. 1 and Fig. 2 Fig. 4 A is described.In light-load conditions, generator 102 is controlled, and has the first switching frequency f1 (for example, pulse-width signal 132 f1=1MHz) with generation.In one embodiment, generator 102 can be by internal control circuit 104 or external control circuit 106 controls.As shown in Fig. 4 A, the slope of inductive current equals the input voltage V in input 172
InDivided by induction reactance L
B(V
In/ L
B).Inductance peak current I
P1Equal the average electric current I
Ave1And pulsating current I between peak to peak
Sw11/2nd summation (I
P1=I
Ave1+ I
Sw1/ 2).
Fig. 4 B shows the waveform 302B that is illustrated in the electric current of the inductance B that flows through in the heavy duty condition according to an embodiment of the invention.In conjunction with Fig. 1 and Fig. 2 Fig. 4 B is described.In the heavy duty condition, generator 102 is controlled, and has pulse-width signal 132 greater than the second switch frequency f 2 (for example f2=4MHz) of the first switching frequency f1 with generation.As shown in Fig. 4 B, the slope of inductive current equals the input voltage V in input 172
InDivided by induction reactance L
B(V
In/ L
B).Inductance peak current I
P2Equal the average electric current I
Ave2And pulsating current I between peak to peak
Sw21/2nd summation (I
P2=I
Ave2+ I
Sw2/ 2).
In one embodiment, as shown in Fig. 4 A and Fig. 4 B, (f2＞f1) can reduce pulsating current (I between the peak to peak of inductance to higher switching frequency
SW2＜I
SW1).Though the average electric current I in the heavy duty condition
Ave2Greater than the average electric current I in light-load conditions
Ave1, still, pulsating current I between the inductance peak to peak in the heavy duty condition
SW2Be far smaller than the inductance pulsating current I in light-load conditions
SW1As a result, in high electric current/heavy duty condition, the peak current of inductance B can be reduced to the I at switching frequency f2 place
P2Thereby, I
P2Be in the DC rated current (0.74A) of inductance B.Therefore, according to one embodiment of present invention, in heavy duty and light-load conditions, can use inductance B to obtain high efficiency.
Therefore, all embodiment of the present invention provide the electric power management circuit layout with pulse width modulation frequency control.Advantageously, in one embodiment, the switching frequency of pulse-width signal can be regulated according to different loading conditions.In the heavy duty condition, switching frequency will increase (for example, to 4MHz), with pulsating current between the peak to peak that reduces inductance.In light-load conditions, switching frequency will return to normal value (for example, 1MHz), to reduce switching loss and to obtain more high efficiency.And then according to one embodiment of present invention, in order to reduce space and reducing cost, by a controller and an inductance, the electric power management circuit layout is also supported a plurality of output channels.
Though aforesaid explanation and accompanying drawing have been represented embodiments of the invention, be appreciated that under situation about not breaking away from by the spirit and scope of the appended defined principle of the present invention of claim, can carry out various increases, modification and replacement therein.It will be appreciated by those skilled in the art that, in practice of the present invention is used, the present invention can use under the situation of carrying out many modifications on form, structure, arrangement, ratio, material, element and the assembly etc., these modifications are particularly suitable for particular environment and implement needs, and do not break away from principle of the present invention.Therefore all aspects of current disclosed embodiment can be thought illustrative rather than restrictively, wherein define scope of the present invention, and be not limited to above stated specification by claims and its legal equivalents.
Claims (24)
1. a transducer is characterized in that, comprising:
One pulse-duration modulation signal generator, its generation one is used to control the pulse-width signal of an inductance; And
One is coupled to the control circuit of described generator, is used to control the switching frequency of described pulse-width signal,
Therein,, select first switching frequency, and therein,, select second switch frequency greater than described first switching frequency when described load current during greater than described scheduled current level when load current during less than a scheduled current level.
2. transducer as claimed in claim 1, it is characterized in that, when described load current during less than described scheduled current level, pulsating current reaches the first pulsating current level between the peak to peak of described inductance, wherein, when described load current during greater than described scheduled current level, pulsating current is less than the second pulsating current level of the described first pulsating current level between described peak to peak.
3. transducer as claimed in claim 1 is characterized in that described control circuit comprises an internal control circuit, and it can be operated to be used to monitor described load current and to produce the first frequency control signal and give described generator, is used to control described switching frequency.
4. transducer as claimed in claim 3 is characterized in that described control circuit comprises an external control circuit, and it can be operated to be used to receive external control signal and to produce a second frequency control signal and give described generator, is used to control described switching frequency.
5. transducer as claimed in claim 4 also is included in the signal of communication line between described internal control circuit and the described external control circuit.
6. transducer as claimed in claim 4 is characterized in that described generator comprises an oscillator, and it can be operated and be used to receive described first frequency control signal and described second frequency control signal, and is used to produce a ramp signal.
7. transducer as claimed in claim 3 is characterized in that, described internal control circuit also produces a current controling signal and gives described generator, to regulate the duty ratio of described pulse-width signal.
8. transducer as claimed in claim 7 is characterized in that described generator comprises an amplifier, and it can be operated and be used to receive described ramp signal and described current controling signal, and is used to produce described pulse-width signal.
9. transducer as claimed in claim 1 is characterized in that, selects described load current from first load current and second load current, and this second load current is greater than described first load current.
10. transducer as claimed in claim 1 comprises that also one is coupled to the switch of described inductance, and it is used to receive described pulse-width signal.
11. the method for load is given in a power supply, it is characterized in that, comprising:
The numerical value of monitoring load electric current; And
Switching frequency according to the Numerical Control pulse-width signal of described load current;
Wherein,, select first switching frequency, and therein,, select second switch frequency greater than described first switching frequency when described load current during greater than described scheduled current level when described load current during less than a scheduled current level.
12. method as claimed in claim 11 is characterized in that, also comprises:
Pulsating current between the peak to peak of control inductance, wherein, when described load current during less than described scheduled current level, pulsating current reaches the first pulsating current level between the described peak to peak of described inductance, therein, when described load current during greater than described scheduled current level, pulsating current is less than the second pulsating current level of the described first pulsating current level between described peak to peak.
13. method as claimed in claim 11 is characterized in that, also comprises:
Reception is used to control the frequency control signal of described switching frequency.
14. method as claimed in claim 13 is characterized in that, produces described frequency control signal according to an external control signal.
15. method as claimed in claim 14 is characterized in that, also comprises:
Produce a ramp signal in response to described frequency control signal.
16. method as claimed in claim 15 is characterized in that, also comprises:
Reception is used to regulate the current controling signal of the duty ratio of described pulse-width signal, wherein, produces described pulse-width signal according to described current controling signal and described ramp signal.
17. an electronic equipment is characterized in that, comprising:
One load; And
One is coupled to the transducer of described load, comprising:
One inductance;
One generator, its generation are used to control a pulse-width signal of described inductance;
One output is used for a load current is offered described load;
One internal control circuit, it can be operated and be used to monitor described first load current, and produces the first frequency control signal to described generator, to control described switching frequency; And
One external control circuit, it can be operated to be used to receive external control signal and to produce a second frequency control signal and give described generator, is used to control described switching frequency,
Therein,, select first switching frequency, and therein,, select second switch frequency greater than described first switching frequency when described first load current during greater than described scheduled current level when described first load current during less than a scheduled current level.
18. electronic equipment as claimed in claim 17, it is characterized in that, when described first load current during less than described scheduled current level, pulsating current reaches the first pulsating current level between the peak to peak of described inductance, wherein, when described first load current during greater than described scheduled current level, pulsating current is less than the second pulsating current level of the described first pulsating current level between described peak to peak.
19. electronic equipment as claimed in claim 17 is characterized in that, described internal control circuit arrives described external control circuit with message transmission.
20. electronic equipment as claimed in claim 17 is characterized in that, described external control circuit arrives described internal control circuit with message transmission.
21. electronic equipment as claimed in claim 17 is characterized in that, described internal control circuit also produces a current controling signal and gives described generator, the duty ratio that is used to regulate described pulse-width signal.
22. electronic equipment as claimed in claim 17 is characterized in that, described generator comprises an oscillator, and it can be operated and be used to receive described first frequency control signal and described second frequency control signal, and is used to produce a ramp signal.
23. electronic equipment as claimed in claim 22 is characterized in that, described generator comprises an amplifier, and it is used to receive described ramp signal and described current controling signal, and is used to produce described pulse-width signal.
24. electronic equipment as claimed in claim 17 also comprises a switch element that is coupled to described inductance, it is used to receive described pulse-width signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84414006P | 2006-09-12 | 2006-09-12 | |
| US60/844,140 | 2006-09-12 | ||
| US11/804,495 | 2007-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102154890A Division CN102263506A (en) | 2006-09-12 | 2007-09-11 | Power supply topologies with PWM frequency control |
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| CN101150285A true CN101150285A (en) | 2008-03-26 |
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| CNA2007101544949A Pending CN101150285A (en) | 2006-09-12 | 2007-09-11 | Power supply topologies with PWM frequency control |
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| CN101753022A (en) * | 2008-12-10 | 2010-06-23 | 成都芯源系统有限公司 | Load transient change detection circuit for voltage converter and application circuit thereof |
| CN102185475A (en) * | 2011-03-11 | 2011-09-14 | 苏州易能微电子科技有限公司 | Quick nonlinear response control loop |
| CN102195484A (en) * | 2010-03-18 | 2011-09-21 | 联想(北京)有限公司 | Switching power supply frequency adjusting method and control device for switching power supply |
| CN102904438A (en) * | 2011-07-26 | 2013-01-30 | 鸿富锦精密工业（深圳）有限公司 | Digital pulse duration modulation controller |
| CN110120204A (en) * | 2019-04-04 | 2019-08-13 | 惠科股份有限公司 | Driving method of power supply driving module, power supply driving module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101753022A (en) * | 2008-12-10 | 2010-06-23 | 成都芯源系统有限公司 | Load transient change detection circuit for voltage converter and application circuit thereof |
| CN102195484A (en) * | 2010-03-18 | 2011-09-21 | 联想(北京)有限公司 | Switching power supply frequency adjusting method and control device for switching power supply |
| WO2011113299A1 (en) * | 2010-03-18 | 2011-09-22 | 联想(北京)有限公司 | Method and device for regulating frequency of switching power supply |
| CN102185475A (en) * | 2011-03-11 | 2011-09-14 | 苏州易能微电子科技有限公司 | Quick nonlinear response control loop |
| CN102185475B (en) * | 2011-03-11 | 2013-03-13 | 苏州易能微电子科技有限公司 | Quick nonlinear response control loop |
| CN102904438A (en) * | 2011-07-26 | 2013-01-30 | 鸿富锦精密工业（深圳）有限公司 | Digital pulse duration modulation controller |
| CN111614264A (en) * | 2015-05-01 | 2020-09-01 | 虹冠电子工业股份有限公司 | Switching power supply and improvements thereof |
| CN110120204A (en) * | 2019-04-04 | 2019-08-13 | 惠科股份有限公司 | Driving method of power supply driving module, power supply driving module and display device |
| CN110120204B (en) * | 2019-04-04 | 2020-12-25 | 惠科股份有限公司 | Driving method of power supply driving module, power supply driving module and display device |
| EP4064541A1 (en) * | 2021-03-25 | 2022-09-28 | Infineon Technologies Austria AG | Power supply monitoring and switching frequency control |
| US11689103B2 (en) | 2021-03-25 | 2023-06-27 | Infineon Technologies Austria Ag | Power supply monitoring and switching frequency control |
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