CN203193532U - Two-threshold control system for switch power supply - Google Patents
Two-threshold control system for switch power supply Download PDFInfo
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- CN203193532U CN203193532U CN 201320156485 CN201320156485U CN203193532U CN 203193532 U CN203193532 U CN 203193532U CN 201320156485 CN201320156485 CN 201320156485 CN 201320156485 U CN201320156485 U CN 201320156485U CN 203193532 U CN203193532 U CN 203193532U
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Abstract
The utility model provides a two-threshold control system for a switch power supply. The system comprises a rectifying circuit, a conversion circuit connected with the rectifying circuit and a control circuit connected with the conversion circuit for controlling the output voltage of the conversion circuit, wherein a two-threshold selector is arranged in the control circuit. The double-threshold control system for a switch power supply is additionally provided with a two-threshold selector which selects different output thresholds according to the output load of the system. When light load of the system abruptly changes to heavy load, the two-threshold selector timely adjusts the output threshold to timely adjust the opening time of a switch tube Q1. The two-threshold control system improves dynamic responding speed of the system, and reduces the ripple of the output voltage so that noise of a transformer generated due to abrupt change of load can not be heard.
Description
Technical field
The present invention relates to the switch power technology field, relate in particular to a kind of dual threshold control system of Switching Power Supply.
Background technology
The electricity that electric field sends can not directly use under many circumstances, must carry out the electric energy conversion to it and just can use.For example; use transformer, frequency converter a kind of electric energy of form can be converted to the electric energy of another form; the circuit of realizing this electric energy conversion is exactly Switching Converter Topologies, and wherein, the Switching Converter Topologies with closed-loop control and protection link is exactly Switching Power Supply.
Figure 1 shows that a kind of traditional pulse frequency modulated (Pulse frequency modulation, PFM) inverse-excitation type AC-DC switching power converters circuit comprises: rectification circuit 300, the translation circuit 400 that is connected with rectification circuit 300 and the control circuit 100 that is used for control change circuit 400 output voltages that is connected with translation circuit.
Wherein, translation circuit 400 comprises: transformer T1, the former limit circuit 401 of transformer T1, the secondary output circuit 402 of transformer T1 and the compole feedback circuit 403 of transformer T1.The former limit circuit 401 of transformer T1 comprises: former limit winding Np, the diode D1 of transformer T1, capacitor C 1, resistance R 1, switching tube Q1, resistance R cs, former limit winding Np and diode D1, capacitor C 1 are connected mutually, capacitor C 1 and resistance R 1 parallel connection, the collector electrode of switching tube Q1 is connected with the positive pole of diode D1, base stage is connected with control circuit 100, emitter is by resistance R cs ground connection, and emitter also is connected with control circuit 100 simultaneously; The secondary output circuit 402 of transformer T1 comprises: the secondary winding Ns of the transformer T1 that is one another in series, diode D2 and capacitor C 2, and with capacitor C 2 parallel resistor R2; The compole feedback circuit 403 of transformer T1 comprises: compole winding Na, diode D3 and the capacitor C 3 of the transformer T1 that is one another in series, and the resistance R 3 that is one another in series and resistance R 4, in resistance R 3 after the series connection and the two ends of resistance R 4, one end of resistance R 3 is connected with the positive pole of diode D3, an end ground connection of resistance R 4.Resistance R 3 and the resistance R 4 middle tie point f that take out from series connection as signal FB, make it be connected with control circuit 100, and namely signal FB inputs to control circuit 100.
The signal FB of compole feedback circuit 403 outputs of transformer T1, it includes the current over-zero time information of diode D2, after demagnetization testing circuit 103 receives signal FB, demagnetization testing circuit 103 can detect the current over-zero moment of diode D2, be exactly the moment that demagnetization finishes, from the current over-zero of diode D2 constantly, index maker 104 can ramp signal Vramp who rises with index in time of output, wherein
, a wherein, b, c are the constant greater than 0, and when transformer T1 demagnetization process began, ramp signal Vramp was resumed and is initial value c.After ramp signal Vramp is input in the comparator 105, compare with the signal of error amplifier 102 outputs, if ramp signal Vramp is greater than the signal of error amplifier 102 outputs, obtain an energizing signal, be sent to trigger 107, by driver 108 switching tube Q1 is opened, switching tube Q1 can be a triode again, and it also is MOS transistor.After switching tube Q1 opened, the electric current that flows through the former limit of transformer T1 winding Np also rose with certain slope, so, voltage CS on the resistance R cs is along with rising, when voltage CS reached fixing voltage threshold VCS, comparator 106 upsets were closed switching tube Q1 by trigger 107 and driver 108.After Q1 closed, transformer T1 began a new demagnetization process again, when demagnetization finishes, ramp signal Vramp compares with the signal that error amplifier 102 is exported again, the energizing signal that obtains can be opened switching tube Q1 again, and above process moves in circles, and system keeps output voltage by these actions.
As seen, above-mentioned switching power converters circuit, the output loading size of its system has directly influenced the length of demagnetization time, has also determined the time length of switching tube Q1 remain off.When the output loading of system was big, it is shorter that the electric current that flows through diode D2 drops to time of zero from peak value, causes the transformer T1 demagnetization time shorter, makes that the time of switching tube Q1 remain off is also shorter.Otherwise, when the output loading of system hour, it is longer that the electric current that flows through diode D2 drops to time of zero from peak value, causes the transformer T1 demagnetization time longer, makes that the time of switching tube Q1 remain off is also longer.
Therefore, above-mentioned switching power converters circuit, when the output loading of system when load variations is heavy duty on the lenient side suddenly, because the time of switching tube Q1 remain off is longer during underload, when system changes suddenly, the demagnetization testing circuit does not also have enough time to detect the current over-zero moment of diode D2, when system is not able to do in time in time to open switching tube Q1, the output voltage of system has produced decline by a relatively large margin, cause system's output voltage instability, system is poor at the dynamic responding speed of load variations.Again since system when underload and heavy duty, the energy that the transformer secondary output coil receives is the same, therefore, load changing is when the heavy duty on the lenient side when system, output voltage fluctuates bigger, system's output voltage ripple is also bigger at least.In addition, system is when underload, because the time of switching tube Q1 remain off is longer, switch periods is lower, and such switching frequency can enter people's ear induction range, makes people's ear can hear the noise that transformer sends.
Summary of the invention
For this reason, technical problem to be solved by this invention is: dual threshold control system and method that a kind of Switching Power Supply is provided, make system when being suddenlyd change to heavy duty by underload, the dynamic responding speed of raising system, reduce the output voltage ripple of system, allow people's ear can't hear the transformer noise that produces because of load changing.
So, the invention provides a kind of dual threshold control system of Switching Power Supply, comprise rectification circuit, the translation circuit that is connected with rectification circuit and the control circuit that is used for the control change circuit output voltage that is connected with translation circuit, described translation circuit comprises transformer T1, the former limit circuit of transformer T1, secondary output circuit and compole feedback circuit, compole feedback circuit output comprises the control circuit that feeds back signal to of current over-zero time information in T1 time grade of output circuit of transformer, control circuit detects described zero passage after the moment, the signal that control circuit feeds back to according to the compole feedback circuit is adjusted the output voltage of T1 level of transformer output circuit, wherein, one dual threshold selector is set in control circuit, this dual threshold selector receives two fixed thresholds of different sizes, and select corresponding threshold value and export to the former limit circuit of transformer T1 according to the pulse frequency modulated PFM signal of input, when system's output loading is heavy, pulse frequency modulated PFM signal notice dual threshold selector is selected described bigger threshold value, when system's output loading was light, pulse frequency modulated PFM signal notice dual threshold selector was selected described less threshold value.
Wherein, the secondary output circuit of described transformer T1 comprises: the secondary winding Ns of the transformer T1 that is one another in series, diode D2 and capacitor C 2, and with capacitor C 2 parallel resistor R2.
The former limit circuit of described transformer T1 comprises: former limit winding Np, the diode D1 of transformer T1, capacitor C 1, resistance R 1, switching tube Q1, resistance R cs, former limit winding Np and diode D1, capacitor C 1 are connected mutually, capacitor C 1 and resistance R 1 parallel connection, the collector electrode of switching tube Q1 is connected with the positive pole of diode D1, base stage is connected with control circuit, emitter is by resistance R cs ground connection, and emitter also is connected with control circuit simultaneously.
The compole feedback circuit of described transformer T1 comprises: compole winding Na, diode D3 and the capacitor C 3 of the transformer T1 that is one another in series, and the resistance R 3 that is one another in series and resistance R 4, in resistance R 3 after the series connection and the two ends of resistance R 4, one end of resistance R 3 is connected with the positive pole of diode D3, one end ground connection of resistance R 4, resistance R 3 and the resistance R 4 middle tie point f that take out from series connection as signal FB, input to control circuit.
Described control circuit comprises: sample circuit, error amplifier, for detection of current over-zero demagnetization testing circuit constantly in T1 level of the transformer output circuit, be used for detecting T1 level of transformer output circuit current over-zero constantly from the demagnetization testing circuit, the index maker of the ramp signal that output is risen with index in time, comparator 205, comparator 206, trigger, driver and dual threshold selector, the feedback signal of exporting in the described compole feedback circuit inputs to sample circuit and demagnetization testing circuit simultaneously, the output of sample circuit is connected with an input of error amplifier, the output of demagnetization testing circuit is connected with the input of index maker, the output of index maker is connected with another input of comparator 205, the output of comparator 205 is connected with trigger one input, another input of the output of comparator 206 and trigger is connected, the output of trigger is connected with driver input end, driver output end is connected with the base stage of switching tube Q1, one input of comparator 206 is connected with the emitter of switching tube Q1, and another input connects the output of dual threshold selector.
Described control circuit comprises: sample circuit, error amplifier, for detection of current over-zero demagnetization testing circuit constantly in T1 level of the transformer output circuit, be used for detecting T1 level of transformer output circuit current over-zero constantly from the demagnetization testing circuit, the index maker of the ramp signal that output is risen with index in time, comparator 205, comparator 206, trigger, driver and dual threshold selector, the feedback signal of exporting in the described compole feedback circuit inputs to sample circuit and demagnetization testing circuit simultaneously, the output of sample circuit is connected with an input of error amplifier, the output of demagnetization testing circuit is connected with the input of index maker, the output of index maker is connected with another input of comparator 205, the output of comparator 205 is connected with trigger one input, another input of the output of comparator 206 and trigger is connected, the output of trigger is connected with driver input end, driver output end is connected on the former limit circuit of transformer T1, one input of comparator 206 is connected with the former limit circuit of transformer T1, and another input connects the output of dual threshold selector.
Described pulse frequency modulated PFM signal, switching signal frequency dependence connection in its frequency and the varying circuit, the demagnetization time correlation connection of the duty ratio of pulse frequency modulated PFM signal and system, switching frequency in the varying circuit uprises along with the increasing of load, and the demagnetization time of system diminishes along with the increasing of load.
The dual threshold control system of Switching Power Supply of the present invention, by in the control circuit of Switching Power Supply, setting up the dual threshold selector, make this selector to select different threshold value output according to system's output loading weight, this selector only receives two fixed thresholds of different sizes, when system's output loading is heavy, select bigger threshold value, when system's output loading is light, select less threshold value.Like this, when system sports heavy duty by underload, the selector of control circuit can in time be adjusted the threshold value of output, and then in time adjusted the time that switching tube Q1 opens, improved the dynamic responding speed of system, reduce the output voltage ripple of system, allow people's ear can't hear the transformer noise that produces because of load changing.
Description of drawings
Fig. 1 is PFM inverse-excitation type AC-DC switching power converters circuit diagram in the prior art;
Fig. 2 is the dual threshold control system circuit diagram of the described Switching Power Supply of the embodiment of the invention.
Embodiment
Below, describe the present invention by reference to the accompanying drawings.
As shown in Figure 2, present embodiment provides a kind of dual threshold control system of Switching Power Supply, the translation circuit 400 that comprise rectification circuit 300, is connected with rectification circuit and the control circuit 200 that is used for control change circuit 400 output voltage V o that is connected with translation circuit 400.
Wherein, translation circuit 400 comprises: former limit circuit 401, secondary output circuit 402 and the compole feedback circuit 403 of transformer T1, transformer T1, what compole feedback circuit 403 output packets contained the diode D2 current over-zero time information of flowing through in the transformer T1 time level output circuit 402 feeds back signal to control circuit 200, the flow through electric current of diode D2, the electric current in T1 the level of transformer of flowing through the exactly output circuit.Control circuit 200 detects described zero passage after the moment, the current over-zero that is closed to diode D2 from switching tube Q1 is exactly the demagnetization time of transformer T1 constantly, the current value of secondary output circuit is more little, the demagnetization time of transformer T1 is more long, correspondingly, control circuit is by a ramp signal, opens switching tube Q1 again after waiting for a longer time, the current value of secondary output circuit is more little in other words, and the switching frequency of switching tube Q1 is more low; Simultaneously, one dual threshold selector 209 is set in control circuit 200, this dual threshold selector receives two fixed threshold VR1 and the VR2 of different sizes, suppose that VR1 is less than VR2, dual threshold selector 209 is selected corresponding threshold value according to the pulse frequency modulated PFM signal of its input and is exported to the former limit circuit 401 of transformer T1, when system's output loading is heavy, pulse frequency modulated PFM signal notice dual threshold selector 209 is selected described bigger threshold value VR2, when system's output loading was light, pulse frequency modulated PFM signal notice dual threshold selector was selected described less threshold value VR1.The output loading of system shown in the present embodiment refers to the output loading of T1 level of transformer output circuit.
Here, of particular note, dual threshold selector 209 only can receive and carry out the selection of two fixed thresholds in the present embodiment, it selects to have Duoed an alternative condition than the only fixing threshold value in the background technology, make this selector to select different threshold value output according to system's output loading weight, when system's output loading was heavy, dual threshold selector 209 was selected bigger threshold value VR2, when system's output loading was light, the dual threshold selector was selected less threshold value VR1.
Concrete, the secondary output circuit 402 of transformer T1 comprises: the secondary winding Ns of the transformer T1 that is one another in series, diode D2 and capacitor C 2, and with capacitor C 2 parallel resistor R2.
The former limit circuit 401 of transformer T1 comprises: former limit winding Np, the diode D1 of transformer T1, capacitor C 1, resistance R 1, switching tube Q1, resistance R cs, former limit winding Np and diode D1, capacitor C 1 are connected mutually, capacitor C 1 and resistance R 1 parallel connection, the collector electrode of switching tube Q1 is connected with the positive pole of diode D1, base stage is connected with control circuit, emitter is by resistance R cs ground connection, and emitter also is connected with control circuit simultaneously.
The compole feedback circuit 403 of transformer T1 comprises: compole winding Na, diode D3 and the capacitor C 3 of the transformer T1 that is one another in series, and the resistance R 3 that is one another in series and resistance R 4, in resistance R 3 after the series connection and the two ends of resistance R 4, one end of resistance R 3 is connected with the positive pole of diode D3, one end ground connection of resistance R 4, resistance R 3 and the resistance R 4 middle tie point f that take out from series connection as signal FB, input to control circuit.
The specific implementation principle is: pulse frequency modulated PFM signal, the switching signal frequency dependence connection of its frequency and switching tube Q1, the demagnetization time correlation connection of the duty ratio of pulse frequency modulated PFM signal and system, the switching frequency of switching tube Q1 uprises along with the increasing of load, and the demagnetization time of system diminishes along with the increasing of load.When the output loading of system was heavier, pulse frequency modulated PFM signal made the output VCS of dual threshold selector select the bigger threshold value VR2 signal of magnitude of voltage; When the output loading of system was lighter, pulse frequency modulated PFM signal made the output VCS of dual threshold selector select the less threshold value VR1 signal of magnitude of voltage.
An input of comparator 206 connects the current sensing signal CS of the former limit of transformer T1 circuit, another input connects the output of dual threshold selector 209, this output output VCS signal, when switching tube Q1 opens, current sensing signal CS signal rises with certain slope, the more big current sensing signal CS of the electric current level that flows through switching tube Q1 is more high, when current sensing signal CS reaches VCS signal predetermined level value, and the upset of the output level of comparator 206.When current sensing signal CS signal reached VCS predetermined level value, the upset of the output level of comparator 206 was overturn the output of trigger assembly 207 and driver 208, thereby reduces to flow through the electric current of switching tube Q1, even closes switching tube Q1.
In embodiment of the present invention, according to formula
We can obtain as drawing a conclusion:
1. work as
Hour, less threshold level, the peak current when reducing switching tube Q1 conducting are selected by the dual threshold selector by system
Thereby the switching frequency of raising power switch pipe Q1 makes Switching Power Supply when load is lighter, and switching frequency can not enter people's ear scope, that is: people's ear be can't hear the transformer noise that produces because of load changing;
2. when underload is switched to heavy duty because the switching frequency of switching tube Q1 improves, wait by the time next time Tui Ci time reduce, make the response speed of system be improved;
3. lower when underloading owing to the VCS level, the peak current during switch conduction
Less, so the energy of phase transmission weekly
, the voltage variety on the output capacitance C2 is also just reduced, and has reduced the ripple of output voltage;
As seen, the described system of present embodiment, when system sports heavy duty by underload, dual threshold selector 209 can in time be adjusted the threshold value of output, and then in time adjusted the time that switching tube Q1 opens, not only improved the dynamic responding speed of system, reduced the output voltage ripple of system, and allowed people's ear can't hear the transformer noise that produces because of load changing.The described dual threshold control of present embodiment is compared with other similar techniques means, and its method for designing is succinct, the good stability of system's loop.
Present embodiment also provides a kind of dual threshold control method of Switching Power Supply, comprising:
The dual threshold selector receives two fixed thresholds that vary in size, and selects corresponding threshold value and output according to the pulse frequency modulated PFM signal of input;
When system's output loading was heavy, pulse frequency modulated PFM signal notice dual threshold selector was selected described bigger threshold value, and when system's output loading was light, pulse frequency modulated PFM signal notice dual threshold selector was selected described less threshold value.
Wherein, described threshold value is determined according to Switching Power Supply application scenario and actual loading situation.
In sum, dual threshold control system and the method for the described Switching Power Supply of present embodiment, by in the control circuit of Switching Power Supply, setting up the dual threshold selector, make this selector to select different threshold value output according to system's output loading weight, this selector only receives two fixed thresholds of different sizes, when system's output loading is heavy, selects bigger threshold value, when system's output loading is light, select less threshold value.Like this, when system sports heavy duty by underload, the selector of control circuit can in time be adjusted the threshold value of output, and then in time adjusted the time that switching tube Q1 opens, improved the dynamic responding speed of system, reduce the output voltage ripple of system, allow people's ear can't hear the transformer noise that produces because of load changing.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the dual threshold control system of a Switching Power Supply, comprise rectification circuit, the translation circuit that is connected with rectification circuit and the control circuit that is used for the control change circuit output voltage that is connected with translation circuit, described translation circuit comprises transformer T1, the former limit circuit of transformer T1, secondary output circuit and compole feedback circuit, compole feedback circuit output comprises the control circuit that feeds back signal to of current over-zero time information in T1 time grade of output circuit of transformer, control circuit detects described zero passage after the moment, the signal that control circuit feeds back to according to the compole feedback circuit is adjusted the output voltage of T1 level of transformer output circuit, it is characterized in that, one dual threshold selector is set in control circuit, this dual threshold selector receives two fixed thresholds of different sizes, and select corresponding threshold value and export to the former limit circuit of transformer T1 according to the pulse frequency modulated PFM signal of input, when system's output loading is heavy, pulse frequency modulated PFM signal notice dual threshold selector is selected described bigger threshold value, when system's output loading was light, pulse frequency modulated PFM signal notice dual threshold selector was selected described less threshold value.
2. the dual threshold control system of Switching Power Supply according to claim 1, it is characterized in that, the secondary output circuit of described transformer T1 comprises: the secondary winding Ns of the transformer T1 that is one another in series, diode D2 and capacitor C 2, and with capacitor C 2 parallel resistor R2.
3. the dual threshold control system of Switching Power Supply according to claim 2, it is characterized in that, the former limit circuit of described transformer T1 comprises: former limit winding Np, the diode D1 of transformer T1, capacitor C 1, resistance R 1, switching tube Q1, resistance R cs, former limit winding Np and diode D1, capacitor C 1 are connected mutually, capacitor C 1 and resistance R 1 parallel connection, the collector electrode of switching tube Q1 is connected with the positive pole of diode D1, base stage is connected with control circuit, emitter is by resistance R cs ground connection, and emitter also is connected with control circuit simultaneously.
4. the dual threshold control system of Switching Power Supply according to claim 3, it is characterized in that, the compole feedback circuit of described transformer T1 comprises: compole winding Na, diode D3 and the capacitor C 3 of the transformer T1 that is one another in series, and the resistance R 3 that is one another in series and resistance R 4, in resistance R 3 after the series connection and the two ends of resistance R 4, one end of resistance R 3 is connected with the positive pole of diode D3, one end ground connection of resistance R 4, resistance R 3 and the resistance R 4 middle tie point f that take out from series connection, as signal FB, input to control circuit.
5. the dual threshold control system of Switching Power Supply according to claim 4, it is characterized in that, described control circuit comprises: sample circuit, error amplifier, for detection of current over-zero demagnetization testing circuit constantly in T1 level of the transformer output circuit, be used for detecting T1 level of transformer output circuit current over-zero constantly from the demagnetization testing circuit, the index maker of the ramp signal that output is risen with index in time, comparator 205, comparator 206, trigger, driver and dual threshold selector, the feedback signal of exporting in the described compole feedback circuit inputs to sample circuit and demagnetization testing circuit simultaneously, the output of sample circuit is connected with an input of error amplifier, the output of demagnetization testing circuit is connected with the input of index maker, the output of index maker is connected with another input of comparator 205, the output of comparator 205 is connected with trigger one input, another input of the output of comparator 206 and trigger is connected, the output of trigger is connected with driver input end, driver output end is connected with the base stage of switching tube Q1, one input of comparator 206 is connected with the emitter of switching tube Q1, and another input connects the output of dual threshold selector.
6. the dual threshold control system of Switching Power Supply according to claim 1, it is characterized in that, described control circuit comprises: sample circuit, error amplifier, for detection of current over-zero demagnetization testing circuit constantly in T1 level of the transformer output circuit, be used for detecting T1 level of transformer output circuit current over-zero constantly from the demagnetization testing circuit, the index maker of the ramp signal that output is risen with index in time, comparator 205, comparator 206, trigger, driver and dual threshold selector, the feedback signal of exporting in the described compole feedback circuit inputs to sample circuit and demagnetization testing circuit simultaneously, the output of sample circuit is connected with an input of error amplifier, the output of demagnetization testing circuit is connected with the input of index maker, the output of index maker is connected with another input of comparator 205, the output of comparator 205 is connected with trigger one input, another input of the output of comparator 206 and trigger is connected, the output of trigger is connected with driver input end, driver output end is connected on the former limit circuit of transformer T1, one input of comparator 206 is connected with the former limit circuit of transformer T1, and another input connects the output of dual threshold selector.
7. according to the dual threshold control system of any described Switching Power Supply of claim 1 to 6, it is characterized in that, described pulse frequency modulated PFM signal, switching signal frequency dependence connection in its frequency and the varying circuit, the demagnetization time correlation connection of the duty ratio of pulse frequency modulated PFM signal and system, switching frequency in the varying circuit uprises along with the increasing of load, and the demagnetization time of system diminishes along with the increasing of load.
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| CN 201320156485 CN203193532U (en) | 2013-03-30 | 2013-03-30 | Two-threshold control system for switch power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151943A (en) * | 2013-03-30 | 2013-06-12 | 深圳市富满电子有限公司 | Dual-threshold control system and method for switch power supply |
| CN105048814A (en) * | 2014-04-24 | 2015-11-11 | 立锜科技股份有限公司 | Flyback power converter and control circuit and control method thereof |
| CN106452114A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Variable time constant digital exponential wave generator |
| CN116722720A (en) * | 2023-08-10 | 2023-09-08 | 恩赛半导体(成都)有限公司 | Auxiliary circuit, power supply system and electronic device |
-
2013
- 2013-03-30 CN CN 201320156485 patent/CN203193532U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151943A (en) * | 2013-03-30 | 2013-06-12 | 深圳市富满电子有限公司 | Dual-threshold control system and method for switch power supply |
| CN105048814A (en) * | 2014-04-24 | 2015-11-11 | 立锜科技股份有限公司 | Flyback power converter and control circuit and control method thereof |
| CN105048814B (en) * | 2014-04-24 | 2017-12-12 | 立锜科技股份有限公司 | Flyback type electric source supply device and its control circuit and control method |
| CN106452114A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Variable time constant digital exponential wave generator |
| CN116722720A (en) * | 2023-08-10 | 2023-09-08 | 恩赛半导体(成都)有限公司 | Auxiliary circuit, power supply system and electronic device |
| CN116722720B (en) * | 2023-08-10 | 2023-10-24 | 恩赛半导体(成都)有限公司 | Auxiliary circuit, power supply system and electronic device |
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| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Tian Futian District Shennan Road, Che Kung Temple Industrial Zone digital city Times Building building 2403A-1 Patentee after: FINE MADE MICROELECTRONICS GROUP CO.,LTD. Address before: 518000 Guangdong city of Shenzhen province Tian Futian District Shennan Road, Che Kung Temple Industrial Zone digital city Times Building building 2403A-1 Patentee before: SHENZHEN FUMAN ELECTRONIC Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 1701, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Patentee after: Fuman microelectronics Group Co.,Ltd. Address before: Main building 2403a-1, times building, Tian'an Digital City, chegongmiao Industrial Zone, Shennan West Road, Futian District, Shenzhen, Guangdong 518000 Patentee before: FINE MADE MICROELECTRONICS GROUP CO.,LTD. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |