CN101399495A - Switching mode power supplies with digital electromagnetic interference control - Google Patents
Switching mode power supplies with digital electromagnetic interference control Download PDFInfo
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- CN101399495A CN101399495A CNA2008102151000A CN200810215100A CN101399495A CN 101399495 A CN101399495 A CN 101399495A CN A2008102151000 A CNA2008102151000 A CN A2008102151000A CN 200810215100 A CN200810215100 A CN 200810215100A CN 101399495 A CN101399495 A CN 101399495A
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Abstract
A method of programming a switching mode power supply before or after the power supply is installed in a system to control electromagnetic interference. The switching mode power supply includes at least one switching device and a digital controller. The digital controller adjusts a switching frequency of the at least one switching device based on one or more programmable parameters. The method includes programming the digital controller with the one or more programmable parameters via a user interface. The programmable parameter(s) define a switching frequency adjustment to control electromagnetic interference.
Description
The cross reference of related application
The number of patent application that the application requires on September 29th, 2007 to apply for is 60/976,420 U.S. Provisional Application No., and the full content of this application is incorporated in the present specification as a reference.
Technical field
The application relates to Switching Power Supply and the electromagnetic interference (EMI) that Switching Power Supply produces is controlled.
Background technology
The statement of this section only provides the background information relevant with the application, and not necessarily is equal to prior art.
Switching Power Supply generally comprises one or more switching devices.Switching device is typically controlled by the pulse width modulating signal with fast rise time and quick fall time.In use, switching device produces electromagnetic interference (EMI).By using specific discrete circuit parts such as for example resistor, inductor and capacitor etc. to adjust the switching frequency of switching device, can reduce EMI.These discreet components are to select and design for specific application of power.Also utilize discrete filter element, component layouts and shield the EMI that reduces in the Switching Power Supply.
Summary of the invention
According to an aspect of the present invention, a kind of being used for provides the Switching Power Supply of electric current to comprise to load: be used to receive the input of input voltage, switching device that at least one is connected to input, based on one or more programmable parameters (programmable parameter) thus adjust at least one switching device switching frequency control electromagnetic interference digitial controller and be used for providing the DLL (dynamic link library) of at least one programmable parameter to digitial controller.
According to another aspect of the present invention, a kind of method that is used for the Switching Power Supply programming (program) of the system of being installed to is controlled electromagnetic interference is disclosed.Switching Power Supply comprises at least one switching device and a digitial controller of adjusting the switching frequency of at least one switching device based at least one programmable parameter.This method comprises by user interface (user interface) with at least one programmable parameter digital controller programming.At least one programmable parameter has defined the switching frequency adjustment, makes that the electromagnetic interference that comes from system is controlled.
According to a further aspect of the invention, a kind of being used for provides the Switching Power Supply of direct current to comprise to load: thus be used to receive input voltage input, be connected to input and be used for to the rectifier of input voltage rectification, be connected to rectifier circuit and comprise the switch converters of at least two switching devices, adjust the digitial controller of switching frequency control electromagnetic interference of at least two switching devices and the DLL (dynamic link library) that is used for receiving at least one programmable parameter based at least one programmable parameter.
According to a further aspect of the invention, a kind of being used for comprises the calculation element of the digitial controller of Switching Power Supply programming with the control electromagnetic interference: be used to receive the adjustment of definition switching frequency user's input user interface and import with the processor of at least one programmable parameter in response to the user digital controller programming.At least one programmable parameter is the one or more switching device definition switching frequency adjustment in the Switching Power Supply.
According to description provided herein, the more scope of application will become clearly.Be appreciated that these are described and object lesson only is for illustrative purposes, rather than want to limit the scope of the invention.
Description of drawings
Accompanying drawing described herein only is for illustrative purposes, and does not plan to limit by any way scope disclosed by the invention.
Fig. 1 is the flow chart according to the method that Switching Power Supply is programmed of an embodiment disclosed by the invention;
Fig. 2 is a spectrum analysis curve chart, and it for example understands the linear frequency adjustment of basic switch frequency;
Fig. 3 is a spectrum analysis curve chart, and it for example understands the random frequency adjustment of basic switch frequency;
Fig. 4 is a waveform chart, and its for example understands reference clock signal, have the pwm signal of fundamental frequency and with respect to fundamental frequency linearity, non-linear and pwm signal that random frequency changes are arranged.
Fig. 5 is the block diagram of the Switching Power Supply that links to each other with the calculation element with user interface;
Fig. 6 is the screenshot capture that is used for the graphical user interface of one or more Switching Power Supply programmings;
Fig. 6 a is another screenshot capture that is used for the graphical user interface of one or more Switching Power Supply programmings;
Fig. 7 is a block diagram, and it has illustrated by a plurality of Switching Power Supplies of the server with user interface via the communication adapter programming.
Fig. 8 is the block diagram according to the Switching Power Supply of an embodiment disclosed by the invention;
Fig. 9 is the circuit diagram according to the single-stage Switching Power Supply of another embodiment disclosed by the invention;
Figure 10 is the circuit diagram according to the multi-stage switching power supply of another embodiment disclosed by the invention.
Embodiment
Below being described in only is exemplary in essence, and do not want to limit of the present invention open, use or use.
According to an aspect disclosed by the invention, provide a kind of be used for the Switching Power Supply that is installed in system programmed come from the method for the electromagnetic interference of system with control.Switching Power Supply comprises for example digitial controller of microprocessor, microcontroller, digital signal processor etc. of at least one switching device and.Digitial controller switches at least one switching device with switching frequency between the state of Kai Heguan, to provide electric current to load.Digitial controller is adjusted the switching frequency of at least one switching device based at least one programmable parameter.
This method comprises by user interface programmes to digitial controller with at least one programmable parameter.So, the user can programme to digitial controller with at least one programmable parameter, with definition in time to the adjustment of switching frequency (promptly tremble, vibration, shake, swing etc.).By adjusting the switching frequency of at least one switching device in time, digitial controller is deployed into electromagnetic interference (EMI) in the gamut of one frequency range, thereby minimizes the EMI peak value at characteristic frequency place.The result is that system can satisfy some application oriented EMI demand or not worse than the situation of this demand.
One or more programmable parameters may comprise the parameter which class switching frequency indication will use adjust.For example, in certain embodiments, the digitial controller of Switching Power Supply can be programmed to linearity, nonlinear, at random or other mode adjust switching frequency, perhaps can be programmed to and not adjust switching frequency.In other embodiments, can use the sub-fraction of all these selections to adjust switching frequency.
Fig. 1 has illustrated according to the method for a certain embodiments disclosed by the invention to the digitial controller programming of Switching Power Supply, and has represented this method with reference number 100 integral body.Method 100 is included in step 102 place definition basic switch frequency.Can according to the voltage of Switching Power Supply and (or) electric current demand or for example available space, efficient, cost etc. other consider to define the basic switch frequency.The basic switch frequency is the acquiescence switching frequency of at least one switching device.
Fig. 3 shows the example that a nonlinear switching frequency is adjusted.As shown in the figure, switching frequency is along with the time increases to peak frequency 304 from minimum frequency 302.But this increase is non-linear, because the slope that increases at 306 places has changed.After increasing to peak frequency 304, frequency begins to be reduced to minimum frequency 308 from peak frequency 304 in time.This reducing also is non-linear, because the slope that reduces at 310 places has changed.Switching frequency repeatedly increases like this along with the time and reduces.(one or more) programmable parameter has defined the increase of switching frequency in shown time cycle scope and the speed that reduces.
Fig. 4 for example understands several PWM waveforms that can be offered switching device by digitial controller, comprising: pwm signal, the pwm signal through the linear frequency adjustment, the pwm signal that the process non-linear frequency is adjusted and the pwm signal of adjusting through random frequency with basic switch frequency f s1.As shown in Figure 4, the frequency of the pwm signal of linear change increases to fs2 in preceding 3 cycles from frequency f s1 and increases to fs3 again, is reduced to fs2 in ensuing two cycles from fs3 and is reduced to fs1 again, repeats down then.The frequency of the pwm signal of nonlinear change changes to fs4 in preceding 3 cycles from fs1 and changes to fs2 again, has remained unchanged an additional cycle at fs2, changes to fs3 in ensuing two cycles from fs2 then and changes to fs1 again.The frequency of the pwm signal of change at random changes to fs4 in preceding 5 cycles from fs1, changes to fs2 again, changes to fs3 again, changes to fs1 again, has remained unchanged an additional cycle at fs1 then.In cycle subsequently, the frequency of pwm signal will be not can guarantee the same with the front cycle.Should understand, waveform shown in Figure 4 provides for illustrative purposes, and in any given execution mode of these instructions, can use multiple other carrying out pwm signal linear, that nonlinear (for example sine curve) and (perhaps) frequency is at random adjusted.
Switching frequency non-linear or adjust at random can be depending on Switching Power Supply and (or) one or more characteristics of system's (for example computer server) of power supply are housed.These characteristics can comprise, for example operate input voltage, operation input current, internal temperature etc.
Refer again to Fig. 1, method 100 also is included in step 106 place definition peak frequency and changes.This peak frequency changes the external boundary that has defined the switching frequency adjustment.As shown in Figure 2, peak frequency change 208 is the differences between minimum frequency 202/206 and the peak frequency 204.Should be understood that as long as fundamental frequency is present between peak frequency and the minimum frequency then the peak frequency change can be in any desired way pro rata above and below fundamental frequency.
After having defined the peak frequency change, according to select which class switching frequency adjustment at step 104 place, method 100 is carried out certain branch.If selected the adjustment of linear switch frequency, method 100 advances to step 108, to define linear switching frequency adjustment based at least one programmable parameter.Perhaps, if selected adjustment of nonlinear switching frequency or the adjustment of random switching frequency at step 104 place, method 100 advances to step 112, is used for obtaining one or more parameters of being monitored so that definite adjustment to switching frequency.As previously described, can carry out the adjustment of nonlinear switching frequency based on one or more in operation input voltage, operation input current, internal temperature, fan speed, substrate level (bulk voltage level), operation housing (operating enclosure), shielding, the system configuration etc.If selected the non-linear frequency adjustment, method 100 continues at step 104 place, so that define adjustment based at least one programmable parameter and one or more Switching Power Supply characteristic.If selected the random frequency adjustment, then method 100 continues at step 114 place, so that define adjustment at random based at least one programmable parameter and one or more parameter of being monitored.Change in order to produce random frequency, digitial controller obtains one or more parameters of being monitored.The one or more parameters of being monitored that consider to obtain, digitial controller multiply by, divided by with (or) add that these are subjected to monitoring parameter, make product with or the merchant can decompose with different coefficients, to determine frequency change.
Linearity by using definition, non-linear or random frequency adjustment are controlled at least one switching device, and the illustrative methods 100 of Fig. 1 finishes at step 110 place.The flow chart that should be understood that Fig. 1 provides for illustrative purposes, and in any given execution mode of these instructions, the order of concrete operation, the number of operation and operation can change.In addition, one or more users or one or more calculation element can be carried out various operations in mode manual or automatic (promptly passing through computer).
Shown in the illustrative embodiments of Fig. 5, programming can comprise calculation element is connected to Switching Power Supply at least one programmable parameter.This calculation element possesses a user interface that is used for the Switching Power Supply programming.User interface allows the user to finish one or more in the above processing of describing by reference method 100.In one embodiment, user interface is a graphical user interface as shown in Figure 6.On exemplary graphical user interface 600, the user can select in time linearly, non-linearly, or adjusts the switching frequency of Switching Power Supply randomly.Select a class switching frequency adjustment though EMI shown in Figure 6 control is restricted to, in other embodiments, the user may carry out extra control to the switching frequency adjustment by user interface.For example, the particular aspects may be able to select adjusted of user.Particularly, the speed that the user can select switching frequency to adjust selects maximum switching frequency to change, and comprises two or more speed (for example Fig. 3) of switching frequency adjustment etc.
Shown in Fig. 6 a, graphical user interface also can comprise additional control able to programme and to the monitoring of Switching Power Supply.Additional control can be aspect operating condition rather than the EMI aspect to digital controller programming.Additional control can influence the one or more switches of Switching Power Supply or the control of other parts.When the graphical user interface of Fig. 6 and 6a comprises the push button control, be appreciated that in other embodiments and can use other graphical user interface.For example, the user can imitate the analysis of spectrum of Switching Power Supply to adjust switching frequency in graphic interface.Also be appreciated that to use and comprise that for example many other user interfaces such as keyboard, mouse, touch-screen, dimmer switch define one or more programmable parameters.In addition, calculation element can be personal computer, workstation computer, computer server, hand-held computing device or any other suitable calculation element that can have user interface.
In certain embodiments, utilize communication adapter to come Switching Power Supply is programmed.Communication adapter is connected between calculation element (for example computer server) and the one or more Switching Power Supply.As shown in Figure 7, communication adapter 702 server 704 that will have a user interface is connected to first Switching Power Supply 706 and second switch power supply 708.Like this, communication adapter just allows a plurality of Switching Power Supplies can be by multiple programming, thereby has saved time and resource in one or more manufacturings or layoutprocedure.Communication adapter can use for example I
2The serial communication of C serial communication come with server with (or) a plurality of Switching Power Supplies communicate by letter.
Programming can be included in the EMI that measures in the operating process from the system's radiation that possesses described power supply to Switching Power Supply.The EMI of the system's radiation by measuring under controlled environment (for example EMI chamber that has shielded), the user can select a class to the optimal Switching Power Supply adjustment of the particular system that Switching Power Supply has been installed.Like this, programming can comprise linear frequency adjustment programming to Switching Power Supply, next adjusts same Switching Power Supply reprogramming with the nonlinear switching frequency then.The programmable feature of power supply fundamentally provides the real-time optimization to the EMI that comes from system.The type of the switching frequency adjustment of being adopted can be based on one or more EMI requirements of the system that Switching Power Supply has been installed, for example FCC generic request.Perhaps, before power supply is mounted into system, can optimize the EMI performance of programmable power supply individually.
Fig. 8 shows the single-stage power supply able to programme 800 according to another embodiment disclosed by the invention.Power supply 800 comprises the transducer 804 that is used to receive the input 802 of input voltage and comprises at least one switching device.Switching Power Supply 800 also comprises digitial controller 806, thereby this digitial controller is used for adjusting based at least one programmable parameter the switching frequency control electromagnetic interference of at least one switching device.Switching Power Supply 800 further programmable interfaces 808, this programmable interface 808 is used for providing at least one programmable parameter to digitial controller 806.
Fig. 9 shows the able to programme multistage power supply 900 according to another embodiment disclosed by the invention.Switching Power Supply 900 comprises input 902 and the dc-dc converter 904 that is used for receiving input voltage, and this dc-dc converter 904 comprises first switching device 906 and second switch device 908.Switching Power Supply 900 also comprises digitial controller 910, thereby this digitial controller is adjusted the switching frequency control electromagnetic interference of first switching device and second switch device based at least one programmable parameter.
As shown, first switching device and second switch device are field-effect transistors, more particularly are mos field effect transistor (MOSFET).Digitial controller provides pulse-width modulation (PWM) signal to the control terminal of first and second switching devices 906,908.This pwm signal has defined switching frequency.In order to adjust switching frequency, system controller 910 has changed pwm control signal.As mentioned above, can adjust pwm signal linearly, non-linearly or randomly, the EMI that comes from power supply or have the system of power supply with control.It will be understood by those skilled in the art that in the different embodiment of Switching Power Supply and can use other switching device, for example dissimilar transistors, for instance, bipolar junction transistor, field-effect transistor etc.Switch controlling signal also can be fixed or in time along with frequency shift.
Switching Power Supply 900 also comprises the feedback signal of the output of representing Switching Power Supply.This feedback signal provides an additional variable in the adjustment of the switching frequency of first and second switching devices 906,908.Except the output of Switching Power Supply, can also monitor other signal.For example, can monitoring input voltage and input current, make digitial controller based on input voltage and (or) input current adjusts at least one switching frequency.
Figure 10 shows the Switching Power Supply 1000 according to another embodiment.Power supply 1000 comprises the input 1002 that is used to receive input voltage and is connected to input 1002 and is used for input voltage is carried out the full bridge rectifier (full bridge rectifier) 1004 of rectification.In other embodiment disclosed by the invention, can comprise dissimilar rectifiers.Switching Power Supply also comprises the dc-dc converter (switching converter) 1006 that links to each other with rectifier.This dc-dc converter is included in the switching device 1008 and 1010 and the switching device in another grade 1012 and 1014 in the one-level wherein.As shown in figure 10, Switching Power Supply 1000 also comprises digitial controller 1016 and programmable interface 1018.Thereby the switching frequency that system controller 1016 is adjusted switch 1008,1010,1012 and 1014 based at least one programmable parameter suppresses to come from the EMI of system.Programmable interface 1018 provides at least one programmable parameter to digitial controller 1016.
The feedback signal of the output of Switching Power Supply is being represented in digitial controller 1016 monitorings.System controller is also monitored the voltage and current relevant with input voltage.Digitial controller also can be monitored the internal temperature of Switching Power Supply or the temperature of the system of Switching Power Supply has been installed.
Based on the above-mentioned characteristic that monitors, digitial controller can define the adjustment to one or more switching frequencies of switching device 1008,1010,1012 and 1014.Each switching frequency is based at least one programmable parameter, and also can select based on above-mentioned one or more characteristics that monitor.For example, except Switching Power Supply, system can comprise several intrawares.Based on the electric current operating position of other parts, the electric current demand of Switching Power Supply may increase and reduce.By monitoring input current and output current one of them, Switching Power Supply can be shaken switching device 1008,1010,1012 and 1014 one or more switching frequencies under the situation of high current demand.When the electric current demand was low, one or more switching devices can switch (promptly not having the switching frequency adjustment) at the fundamental frequency place.In other words, a programmable parameter can define one or more threshold switch power supply characteristics, will be included in the trembling or swing of switching frequency of one or more switching devices at this specific character place digitial controller.Each switching frequency can not depend on the switching frequency of one or more other switching devices, also can depend on this switching frequency.
Be appreciated that instruction disclosed by the invention can be applied to the AC/DC and the DC/DC transducer of the switching device that has adopted generation EMI.
The description of this paper is in essence only as example, and the variation that does not therefore deviate from described main points is meant in the category of instruction.Can not think that it is to the spirit of instruction and deviating from of category that such variation has broken away from.
Claims (23)
1. Switching Power Supply that is used for providing electric current to load, described power supply comprises:
Be used for receiving the input of input voltage;
At least one is connected to the switching device of described input;
Digitial controller, it is used for adjusting based on one or more programmable parameters the switching frequency of at least one switching device, with the control electromagnetic interference; With
DLL (dynamic link library), it is used for providing at least one programmable parameter to described digitial controller.
2. Switching Power Supply as claimed in claim 1, wherein, described one or more programmable parameters have defined the linearity adjustment to described switching frequency.
3. Switching Power Supply as claimed in claim 1, wherein, described one or more programmable parameters have defined the adjustment at random to described switching frequency.
4. Switching Power Supply as claimed in claim 1, wherein, described one or more programmable parameters have defined the non-linear adjustment to described switching frequency.
5. Switching Power Supply as claimed in claim 4, wherein, described digitial controller is configured to based on described one or more programmable parameters with based on the one or more switching frequencies of non-linearly adjusting described at least one switching device in operation input voltage, operation input current and the temperature.
6. Switching Power Supply as claimed in claim 1 further comprises dc-dc converter, and this dc-dc converter comprises described at least one switching device.
7. Switching Power Supply as claimed in claim 1, wherein, described digitial controller is configured to adjust based on the feedback signal of described one or more programmable parameters and described Switching Power Supply the switching frequency of described at least one switching device.
8. Switching Power Supply as claimed in claim 1, wherein, described at least one switching device comprises at least two switching devices.
One kind to the Switching Power Supply in the system of being installed to programme with control electromagnetic interference method, described Switching Power Supply comprises at least one switching device and adjusts the digitial controller of the switching frequency of described at least one switching device based at least one programmable parameter, described method comprises by user interface programmes to described digitial controller with at least one programmable parameter, described at least one programmable parameter has defined the switching frequency adjustment, makes the electromagnetic interference that comes from described system be controlled.
10. method as claimed in claim 9 wherein, comprises the linear switching frequency adjustment of selection to described digitial controller programming.
11. method as claimed in claim 9, wherein, described at least one programmable parameter has defined the switching frequency adjustment based on one or more operating conditions of described Switching Power Supply.
12. method as claimed in claim 9 wherein, comprises the adjustment of selection nonlinear switching frequency to described digitial controller programming.
13. method as claimed in claim 12, wherein, described at least one programmable parameter has defined based on the one or more nonlinear switching frequency adjustment in the input voltage in the described system, input current, internal temperature, fan speed and the substrate level.
14. method as claimed in claim 9, the DLL (dynamic link library) that further comprises described Switching Power Supply is connected to the calculation element with described user interface.
15. method as claimed in claim 9, wherein, described user interface is a graphical user interface.
16. method as claimed in claim 9, the DLL (dynamic link library) that further comprises described Switching Power Supply is connected to the calculation element with described user interface by communication adapter, and described communication adapter is configured to communicate by letter with a plurality of Switching Power Supplies that are connected to described calculation element.
17. method as claimed in claim 9 further is included as described at least one switching device definition basic switch frequency.
18. method as claimed in claim 9 further is included as scope of described switching frequency adjustment definition.
19. method as claimed in claim 9 further comprises and measures the electromagnetic interference relevant with described system.
20. a Switching Power Supply that is used for providing to load direct current, described Switching Power Supply comprises:
Input, it is used to receive input voltage;
Rectifier, it is connected to described input and is used for to described input voltage rectification;
Dc-dc converter, it is connected to rectification circuit and comprises at least two switching devices;
Digitial controller, it adjusts the switching frequency of described at least two switching devices based at least one programmable parameter, with the control electromagnetic interference; With
DLL (dynamic link library), it is used to receive described at least one programmable parameter.
21. Switching Power Supply as claimed in claim 20, wherein, described digitial controller is configured to adjust based on the feedback signal of described at least one programmable parameter and described Switching Power Supply the switching frequency of described at least two switching devices.
22. Switching Power Supply as claimed in claim 20, further comprise the adjuster that is connected between described rectifier and the described dc-dc converter, this adjuster comprises at least one governor switch device, and described digitial controller is configured to adjust the switching frequency of described governor switch device with the control electromagnetic interference.
23. one kind is used for the digitial controller of Switching Power Supply programmed and controls the calculation element of electromagnetic interference, described calculation element comprises user interface and processor, described user interface is used to receive the user's input that has defined the switching frequency adjustment, described processor is used to respond described user's input and utilizes at least one programmable parameter that described digitial controller is programmed, and described at least one programmable parameter is that the one or more switching devices in the described Switching Power Supply have defined the switching frequency adjustment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US97642007P | 2007-09-29 | 2007-09-29 | |
| US60/976,420 | 2007-09-29 | ||
| US12/009,209 | 2008-01-17 |
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| CN101399495A true CN101399495A (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008102151000A Pending CN101399495A (en) | 2007-09-29 | 2008-09-01 | Switching mode power supplies with digital electromagnetic interference control |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105431801A (en) * | 2013-06-28 | 2016-03-23 | 辛纳普蒂克斯公司 | Synchronizing a switched power supply |
| CN108344119A (en) * | 2018-02-10 | 2018-07-31 | 广东美的制冷设备有限公司 | Control method, device and the computer readable storage medium of air conditioner |
| CN109683694A (en) * | 2018-12-26 | 2019-04-26 | 联想(北京)有限公司 | A kind of control method, device and electronic equipment |
| CN110063751A (en) * | 2019-05-14 | 2019-07-30 | 无锡海斯凯尔医学技术有限公司 | Power-supply system and its control method |
| TWI790701B (en) * | 2021-08-03 | 2023-01-21 | 博盛半導體股份有限公司 | Electromagnetic interference regulator and method by use of capacitive parameters of field-effect transistor |
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2008
- 2008-09-01 CN CNA2008102151000A patent/CN101399495A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105431801A (en) * | 2013-06-28 | 2016-03-23 | 辛纳普蒂克斯公司 | Synchronizing a switched power supply |
| CN105431801B (en) * | 2013-06-28 | 2018-11-09 | 辛纳普蒂克斯公司 | Synchronism switching power supply |
| CN108344119A (en) * | 2018-02-10 | 2018-07-31 | 广东美的制冷设备有限公司 | Control method, device and the computer readable storage medium of air conditioner |
| CN109683694A (en) * | 2018-12-26 | 2019-04-26 | 联想(北京)有限公司 | A kind of control method, device and electronic equipment |
| CN110063751A (en) * | 2019-05-14 | 2019-07-30 | 无锡海斯凯尔医学技术有限公司 | Power-supply system and its control method |
| CN110063751B (en) * | 2019-05-14 | 2024-05-03 | 无锡海斯凯尔医学技术有限公司 | Power supply system and control method thereof |
| TWI790701B (en) * | 2021-08-03 | 2023-01-21 | 博盛半導體股份有限公司 | Electromagnetic interference regulator and method by use of capacitive parameters of field-effect transistor |
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