CN115642797B - Two-stage interaction method based on FB feedback signals in two-stage switching power supply - Google Patents
Two-stage interaction method based on FB feedback signals in two-stage switching power supply Download PDFInfo
- Publication number
- CN115642797B CN115642797B CN202211374103.5A CN202211374103A CN115642797B CN 115642797 B CN115642797 B CN 115642797B CN 202211374103 A CN202211374103 A CN 202211374103A CN 115642797 B CN115642797 B CN 115642797B
- Authority
- CN
- China
- Prior art keywords
- feedback signal
- stage
- signal
- pfc
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003993 interaction Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000630 rising effect Effects 0.000 claims abstract description 26
- 238000012937 correction Methods 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 230000002452 interceptive effect Effects 0.000 claims description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 208000031361 Hiccup Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a two-stage interaction method based on an FB feedback signal in a two-stage switching power supply, wherein the PFC controller acquires the FB feedback signal transmitted by a DC/DC controller; acquiring power of a Power Factor Correction (PFC) circuit by a PFC controller; when the characteristic of the falling edge signal in the FB feedback signal is lower than a preset value, monitoring the FB feedback signal according to a power value short falling edge anti-shake module or a long falling edge anti-shake module of the PFC circuit, and generating a control signal for closing the PFC circuit; and when rising edge signal characteristics appear in the FB feedback signal, detecting whether the FB feedback signal is higher than a preset second FB feedback signal threshold value, and generating a start Power Factor Correction (PFC) circuit control signal.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a two-stage interaction method based on an FB feedback signal in a two-stage switching power supply.
Background
Along with the vigorous development of power electronics technology, an AC/DC switching power supply with high efficiency, high power density and wide voltage range input and output has become a widely used device in industry, and particularly, a two-stage switching power supply has been widely applied. According to the national television industry safety regulation requirement, when the power of the LED display device is more than 75W, a power factor correction PFC (Power Factor Correction) circuit is required to ensure that the power factor and harmonic waves of the LED display device meet the national safety regulation standard.
In the prior art, in a two-stage AC/DC switching power supply, the interaction between a PFC circuit at a front stage and a DC/DC circuit at a rear stage is generally performed in two ways. A control chip is used for interaction between a front PFC circuit and a rear DC/DC circuit, and the scheme has the advantages that power-on and power-off time sequence, switching PFC and error-reporting protection are easier to comprehensively plan. However, the disadvantage is that the signal interference between the two stages is serious, and the topology binding of the front and rear stages causes that the power is difficult to expand, and meanwhile, the power can only be one-to-one and cannot support that one front-stage PFC is connected with a plurality of rear-stage DC/DC power supplies. In another mode, the front PFC circuit and the rear DC/DC circuit are interacted by using one control chip respectively, and the mode has the defect that the two control chips are matched with the conditions of power-on and power-off time sequence, switching PFC, error reporting and the like, so that a very complex application circuit and even an independent MCU are required to realize control. Even if a whole set of chips are used for special PFC control, the chip model binding and the system expansion are poor.
Therefore, a simpler and more effective control method for the PFC circuit in the two-stage switching power supply is needed in the prior art, so that interaction between the front-stage PFC circuit and the rear-stage DC/DC circuit in the two-stage AC/DC switching power supply is realized, and the energy consumption of the front-stage PFC circuit is reduced.
Disclosure of Invention
The technical aim of the invention is to provide a two-stage interaction method based on FB feedback signals in a two-stage switching power supply, which greatly simplifies the interaction mode between a PFC controller and a DC/DC controller, realizes the energy consumption control of a PFC circuit and timely closes a post-stage DC/DC circuit under the fault reporting and power failure states of the PFC circuit.
Based on the technical purpose, the invention provides a two-stage interaction method based on an FB feedback signal in a two-stage switching power supply, wherein the two-stage switching power supply comprises a front-stage power factor correction PFC circuit and a rear-stage DC/DC circuit; the front-stage power factor correction PFC circuit is controlled by using a PFC controller; the back stage DC/DC circuit is controlled by using a DC/DC controller; the method comprises the following steps:
acquiring an FB feedback signal transmitted by a DC/DC controller by a PFC controller; the FB feedback signal is in direct proportion to the output power of the DC/DC circuit;
acquiring power of a Power Factor Correction (PFC) circuit by a PFC controller;
detecting whether the FB feedback signal is lower than a preset first FB feedback signal threshold value when the falling edge signal characteristic appears in the FB feedback signal, and further judging whether the power value of the PFC circuit at the moment is lower than the preset power threshold value when the FB feedback signal is lower than the first FB feedback signal threshold value;
when the power value of the PFC circuit is lower than a preset power threshold, a short falling edge anti-shake module is used for monitoring an FB feedback signal, and if the FB feedback signal is kept in a state of being lower than a preset first FB feedback signal threshold continuously in a first preset duration, the falling edge signal is characterized by being converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated to be closed;
when the power value of the PFC circuit is higher than a preset power threshold, a long falling edge anti-shake module is used for monitoring an FB feedback signal, and if the FB feedback signal is kept in a state of being lower than a preset first FB feedback signal threshold continuously in a second preset time period, the falling edge signal is characterized by being converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated to be closed;
the first predetermined time period is less than the second predetermined time period;
and when rising edge signal characteristics appear in the FB feedback signal, detecting whether the FB feedback signal is higher than a preset second FB feedback signal threshold value, and when the FB feedback signal is higher than the second FB feedback signal threshold value, monitoring the FB feedback signal by a rising edge anti-shake module, and if the FB feedback signal is kept in a state higher than the preset second FB feedback signal threshold value within a third preset duration, converting the rising edge signal characteristics into rising edge pulse control signals and generating a start power factor correction PFC circuit control signal.
In one embodiment, the PFC control signal is not generated if the FB feedback signal is not continuously maintained below a predetermined first FB feedback signal threshold for a first predetermined period of time.
In one embodiment, the PFC control signal is not generated if the FB feedback signal is not continuously maintained above a predetermined second FB feedback signal threshold for a third predetermined period of time.
In one embodiment, the PFC controller forcibly pulls down the transmitting end of the FB feedback signal transmitted by the DC/DC controller to a low level by transmitting an error or power-down signal, thereby controlling the DC/DC controller to turn off the subsequent DC/DC circuit.
The invention also provides a two-stage interaction system based on the FB feedback signal in the two-stage switching power supply, wherein the two-stage switching power supply comprises a front-stage power factor correction PFC circuit and a rear-stage DC/DC circuit; the front-stage power factor correction PFC circuit is controlled by using a PFC controller; the back stage DC/DC circuit is controlled by using a DC/DC controller; the interactive system comprises:
the DC/DC controller inputs the FB feedback signal into the FB feedback signal judging module to detect the falling edge signal characteristic and the rising edge signal characteristic in the FB feedback signal;
the PFC power judging module is used for detecting the power of the front-stage PFC circuit;
a short falling edge anti-shake module, wherein the short falling edge anti-shake module generates a falling edge signal characteristic in the FB feedback signal and simultaneously satisfies that the FB feedback signal is lower than a preset first FB feedback signal threshold value, and monitors the FB feedback signal when the power value of the PFC circuit is lower than the preset power threshold value, and if the FB feedback signal is kept in a state lower than the preset first FB feedback signal threshold value for a first preset duration, the falling edge signal characteristic is converted into a falling edge pulse control signal;
a long falling edge anti-shake module, wherein the long falling edge anti-shake module generates a falling edge signal characteristic in the FB feedback signal and simultaneously satisfies that the FB feedback signal is lower than a preset first FB feedback signal threshold value, and monitors the FB feedback signal when the power value of the PFC circuit is higher than the preset power threshold value, and if the FB feedback signal is kept in a state lower than the preset first FB feedback signal threshold value for a first preset duration, the falling edge signal characteristic is converted into a falling edge pulse control signal;
the rising edge anti-shake module monitors the FB feedback signal when rising edge signal characteristics appear in the FB feedback signal and simultaneously the FB feedback signal is higher than a preset second FB feedback signal threshold value, and if the FB feedback signal is kept in a state higher than the preset second FB feedback signal threshold value for a third preset duration, the rising edge signal characteristics are converted into rising edge pulse control signals;
and the PFC control signal generation module generates a control signal for starting or stopping the front-stage PFC circuit according to the pulse control signals sent by the short falling edge anti-shake module, the long falling edge anti-shake module and the rising edge anti-shake module.
In one embodiment, the interactive system further comprises a PFC fault or power failure feedback module, and the PFC fault or power failure feedback module forcibly pulls down a transmitting end of the FB feedback signal transmitted by the DC/DC controller to a low level through the PFC fault or power failure signal, so as to control the DC/DC controller to close a subsequent stage DC/DC circuit.
One or more embodiments of the present invention may have the following inventive aspects and advantages over the prior art:
the interaction mode between the PFC controller and the DC/DC controller is greatly simplified, and because the FB feedback signal pin of the DC/DC controller is directly led into the PFC controller chip, no additional circuit is needed, and no special PFC controller control logic is required to be configured by the DC/DC controller; therefore, the wide adaptability of the design of the two-stage AC/DC switching power supply system is greatly improved, and the PFC controller chip can be perfectly matched with any DC/DC controller chip with FB feedback signals
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of a two-stage switching power supply system of the present invention;
fig. 2 is a schematic diagram of a two-stage interactive system based on FB feedback signal in a two-stage switching power supply according to a first embodiment of the present invention;
fig. 3 is a flowchart of a two-stage interaction method based on FB feedback signal in a two-stage switching power source according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a two-stage interactive system based on FB feedback signal in a two-stage switching power supply according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a two-stage interactive system based on FB feedback signal in a two-stage switching power supply according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Before proceeding with the detailed description that follows, it may be necessary to set forth definitions of certain words and phrases used throughout the present invention. The terms "coupled," "connected," and derivatives thereof, refer to any direct or indirect communication or connection between two or more elements, whether or not those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," and derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with … …" and its derivatives are intended to include, be included in, interconnect with, contain within … …, connect or connect with … …, couple or couple with … …, communicate with … …, mate, interleave, juxtapose, approximate, bind or bind with … …, have attributes, have relationships or have relationships with … …, etc. The term "controller" refers to any device, system, or portion thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one," when used with a list of items, means that different combinations of one or more of the listed items may be used, and that only one item in the list may be required. For example, "at least one of A, B, C" includes any one of the following combinations: A. b, C, A and B, A and C, B and C, A and B and C.
The description of the first end and the second end of the resistor, the capacitor or the inductor in the present invention is only for distinguishing two connection ends of the device, so as to describe the connection relation between the device and other devices, and does not specifically designate one end of the resistor, the capacitor or the inductor in actual situations. Those skilled in the art will appreciate that in an actual circuit construction, any one of the resistor, capacitor, or inductor may be defined as a first terminal in an actual device, while when the first terminal is defined, the other terminal of the device is automatically defined as a second terminal.
In describing various components or elements in the present invention, the description of "first", "second", "third" … … is used only to distinguish between the components and merely to express different relationships between the components. The description itself used above does not contain any implicit meaning of the association between the components. For example, when only the descriptions of "first" and "third" are presented, it is not meant that there is also "second" therebetween, and the descriptions of "first" and "third" herein mean that there are only two distinct, independent components.
Definitions for other specific words and phrases are provided throughout this specification. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior as well as future uses of such defined words and phrases.
In the present invention, the application combinations of modules and the division levels of sub-modules are for illustration only, and the application combinations of modules and the division levels of sub-modules may have different manners without departing from the scope of the present disclosure.
Example 1
As shown in fig. 1-3, the two-stage interaction method based on FB feedback signals in the two-stage switching power supply of the present embodiment includes:
acquiring an FB feedback signal transmitted by a DC/DC controller by a PFC controller; the FB feedback signal is in direct proportion to the output power of the DC/DC circuit;
acquiring power of a Power Factor Correction (PFC) circuit by a PFC controller;
detecting whether the FB feedback signal is lower than a preset first FB feedback signal threshold value when the falling edge signal characteristic appears in the FB feedback signal, and further judging whether the power value of the PFC circuit at the moment is lower than the preset power threshold value when the FB feedback signal is lower than the first FB feedback signal threshold value;
when the power value of the PFC circuit is lower than a preset power threshold, a short falling edge anti-shake module is used for monitoring an FB feedback signal, if the FB feedback signal does not have signal jump within a first preset time, namely the FB feedback signal is kept in a state of being lower than the preset first FB feedback signal threshold within the first preset time, the falling edge signal characteristic is converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated; if the FB feedback signal is not continuously kept in a state of being lower than a preset first FB feedback signal threshold value within a first preset time period, a PFC control signal is not generated;
when the power value of the PFC circuit is higher than a preset power threshold, a long falling edge anti-shake module is used for monitoring an FB feedback signal, if the FB feedback signal does not have signal jump in a second preset time, namely the FB feedback signal is kept in a state of being lower than a preset first FB feedback signal threshold in the second preset time, the falling edge signal characteristic is converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated; and if the FB feedback signal is not continuously kept in a state of being lower than a preset first FB feedback signal threshold value within a first preset time period, the PFC control signal is not generated.
In this embodiment, the first predetermined time period is less than the second predetermined time period; the response of the FB feedback signal sent by the DC/DC control of the subsequent stage in the two-stage switching power supply is very fast, and if the DC/DC circuit makes repeated fast dynamic response, the FB feedback signal also fluctuates fast up and down. If the repeated switching of the PFC circuit is not a reasonable processing mode at this time, a long falling edge anti-shake module needs to be introduced, and the PFC circuit is allowed to be turned off after the FB feedback signal is continuously lower than a threshold value for a long time.
After the latter stage DC/DC circuit enters a light-load excitation mode (burst mode), the FB feedback signal also fluctuates repeatedly, and the peak value of the FB feedback signal tends to be higher. Since the power of the front stage PFC circuit and the power of the rear stage DC/DC circuit are identical, if the power of the front stage PFC circuit is continuously lower than a predetermined power threshold, the power of the rear stage DC/DC circuit can be considered to be stabilized in a low power state, whereby it can be considered that the fluctuation of the FB feedback signal comes from a light load excited mode or an idle state. Then the short falling edge anti-shake module can be selected at this time, so that the front stage PFC circuit is turned off quickly after FB is lower than the threshold value.
Detecting whether the FB feedback signal is higher than a preset second FB feedback signal threshold value when rising edge signal characteristics appear in the FB feedback signal, and monitoring the FB feedback signal by a rising edge anti-shake module when the FB feedback signal is higher than the second FB feedback signal threshold value, wherein if the FB feedback signal does not have signal jump in a third preset time period, namely the FB feedback signal is kept in a state higher than the preset second FB feedback signal threshold value in the third preset time period, the rising edge signal characteristics are converted into rising edge pulse control signals, and a start Power Factor Correction (PFC) circuit control signal is generated; and if the FB feedback signal is not kept in a state higher than a preset second FB feedback signal threshold value continuously within a third preset time period, the PFC control signal is not generated.
For starting the PFC circuit, burrs that the latter stage DC/DC circuit exceeds the second FB feedback signal threshold in the light-load excitation mode or in the no-load mode need to be filtered, so that the FB feedback signal needs to be monitored by means of the rising edge anti-shake module, and when the FB feedback signal is satisfied for a certain time after continuously exceeding the second FB feedback signal threshold, the PFC circuit is allowed to restart.
In this embodiment, the first FB feedback signal threshold is set to a FB feedback signal corresponding to 30% of the rated power value of the DC/DC circuit. And the second FB feedback signal threshold value is set to be the corresponding FB feedback signal in the state of 80% of the rated power value of the DC/DC circuit.
In this embodiment, the first predetermined period of time is set to 500 μs; the second predetermined time period is set to 500ms.
Example 2
As shown in fig. 4, in this embodiment, when an error or power failure condition occurs in the PFC circuit, the FB feedback signal is forcibly pulled down to a low level by an error or power failure signal output by the PFC controller, and the DC/DC controller controls the post-stage DC/DC circuit to enter silence, based on the foregoing embodiment 1. And the back-stage DC/DC circuit can wait for the state of the front-stage PFC circuit to resume working after the state of the front-stage PFC circuit returns to normal. During this period, power failure of Vcc of the PFC controller and the DC/DC controller may occur, and hiccup restart, achieving system security.
Example 3
As shown in fig. 5, this embodiment shows the simplest connection of the chip pins between the PFC controller and the DC/DC controller. The PFC controller is provided with a Vcc driving pin and an ENF enabling pin, and the DC/DC controller is provided with a Vcc driving pin and an FB feedback signal pin; the Vcc driving pin of the PFC controller is connected with the Vcc driving pin of the DC/DC controller; and an ENF enabling pin of the PFC controller is connected with an FB feedback signal pin of the DC/DC controller.
The pin connection mode between the chips greatly simplifies the interaction mode between the PFC controller and the DC/DC controller, and because the FB feedback signal pin of the DC/DC controller is directly led into the PFC controller chip, no additional circuit is needed, and no special PFC controller control logic is required to be configured by the DC/DC controller; therefore, the wide adaptability of the design of the two-stage AC/DC switching power supply system is greatly improved, and the PFC controller chip can be perfectly matched with any DC/DC controller chip with FB feedback signals.
The above description is only a specific embodiment of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art should modify or replace the present invention within the technical specification described in the present invention.
Claims (8)
1. A two-stage interaction method based on FB feedback signals in a two-stage switching power supply comprises a front-stage power factor correction PFC circuit and a rear-stage DC/DC circuit; the front-stage power factor correction PFC circuit is controlled by using a PFC controller; the back stage DC/DC circuit is controlled by using a DC/DC controller; the interaction method is characterized by comprising the following steps:
acquiring an FB feedback signal transmitted by a DC/DC controller by a PFC controller; the FB feedback signal is in direct proportion to the output power of the DC/DC circuit;
acquiring power of a Power Factor Correction (PFC) circuit by a PFC controller;
detecting whether the FB feedback signal is lower than a preset first FB feedback signal threshold value when the falling edge signal characteristic appears in the FB feedback signal, and further judging whether the power value of the PFC circuit at the moment is lower than the preset power threshold value when the FB feedback signal is lower than the first FB feedback signal threshold value;
when the power value of the PFC circuit is lower than a preset power threshold, a short falling edge anti-shake module is used for monitoring an FB feedback signal, and if the FB feedback signal is kept in a state of being lower than a preset first FB feedback signal threshold continuously in a first preset duration, the falling edge signal is characterized by being converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated to be closed;
when the power value of the PFC circuit is higher than a preset power threshold, a long falling edge anti-shake module is used for monitoring an FB feedback signal, and if the FB feedback signal is kept in a state of being lower than a preset first FB feedback signal threshold continuously in a second preset time period, the falling edge signal is characterized by being converted into a falling edge pulse control signal, and a power factor correction PFC circuit control signal is generated to be closed;
the first predetermined time period is less than the second predetermined time period;
and when rising edge signal characteristics appear in the FB feedback signal, detecting whether the FB feedback signal is higher than a preset second FB feedback signal threshold value, and when the FB feedback signal is higher than the second FB feedback signal threshold value, monitoring the FB feedback signal by a rising edge anti-shake module, and if the FB feedback signal is kept in a state higher than the preset second FB feedback signal threshold value within a third preset duration, converting the rising edge signal characteristics into rising edge pulse control signals and generating a start Power Factor Correction (PFC) circuit control signal.
2. The two-stage interaction method based on FB feedback signal in a two-stage switching power supply of claim 1 wherein if the FB feedback signal is not continuously maintained below a predetermined first FB feedback signal threshold for a first predetermined period of time, no PFC circuit control signal is generated.
3. The two-stage interaction method based on FB feedback signals in a two-stage switching power supply of claim 1 wherein if the FB feedback signal is not continuously maintained above a predetermined second FB feedback signal threshold for a third predetermined period of time, no PFC circuit control signal is generated.
4. The two-stage interaction method based on FB feedback signals in a two-stage switching power supply according to claim 1, wherein the PFC controller forcibly pulls down a transmitting end of the FB feedback signal transmitted by the DC/DC controller to a low level by transmitting an error report or a power-down signal, thereby controlling the DC/DC controller to turn off a subsequent stage DC/DC circuit.
5. A two-stage interaction system based on an FB feedback signal in a two-stage switching power supply comprises a front-stage power factor correction PFC circuit and a rear-stage DC/DC circuit; the front-stage power factor correction PFC circuit is controlled by using a PFC controller; the back stage DC/DC circuit is controlled by using a DC/DC controller; characterized in that the interactive system comprises:
the DC/DC controller inputs the FB feedback signal into the FB feedback signal judging module to detect the falling edge signal characteristic and the rising edge signal characteristic in the FB feedback signal;
the PFC power judging module is used for detecting the power of the front-stage PFC circuit;
a short falling edge anti-shake module, wherein the short falling edge anti-shake module generates a falling edge signal characteristic in the FB feedback signal and simultaneously satisfies that the FB feedback signal is lower than a preset first FB feedback signal threshold value, and monitors the FB feedback signal when the power value of the PFC circuit is lower than the preset power threshold value, and if the FB feedback signal is kept in a state lower than the preset first FB feedback signal threshold value for a first preset duration, the falling edge signal characteristic is converted into a falling edge pulse control signal;
the long falling edge anti-shake module is used for generating a falling edge signal characteristic in the FB feedback signal and simultaneously meeting the conditions that the FB feedback signal is lower than a preset first FB feedback signal threshold value and the power value of the PFC circuit is higher than the preset power threshold value, monitoring the FB feedback signal, and converting the falling edge signal characteristic into a falling edge pulse control signal if the FB feedback signal is continuously kept in a state lower than the preset first FB feedback signal threshold value within a second preset time period;
the rising edge anti-shake module monitors the FB feedback signal when rising edge signal characteristics appear in the FB feedback signal and simultaneously the FB feedback signal is higher than a preset second FB feedback signal threshold value, and if the FB feedback signal is kept in a state higher than the preset second FB feedback signal threshold value for a third preset duration, the rising edge signal characteristics are converted into rising edge pulse control signals;
and the PFC control signal generation module generates a control signal for starting or stopping the front-stage PFC circuit according to the pulse control signals sent by the short falling edge anti-shake module, the long falling edge anti-shake module and the rising edge anti-shake module.
6. The two-stage interactive system based on FB feedback signals in a two-stage switching power supply according to claim 5, wherein the interactive system further comprises a PFC fault or power failure feedback module, and the PFC fault or power failure feedback module forcibly pulls down a transmitting end of the FB feedback signal transmitted by the DC/DC controller to a low level through the PFC fault or power failure signal, so as to control the DC/DC controller to close a subsequent stage DC/DC circuit.
7. A computer readable storage medium storing computer instructions for causing the computer to perform the two-stage interaction method based on FB feedback signal in the two-stage switching power supply of any of claims 1-4.
8. An integrated circuit structure comprising a two-stage interaction system based on FB feedback signal in a two-stage switching power supply as claimed in any one of claims 5 to 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211374103.5A CN115642797B (en) | 2022-11-04 | 2022-11-04 | Two-stage interaction method based on FB feedback signals in two-stage switching power supply |
| PCT/CN2023/123109 WO2024093604A1 (en) | 2022-11-04 | 2023-10-06 | Feedback (fb)-signal-based two-stage interaction method used in two-stage switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211374103.5A CN115642797B (en) | 2022-11-04 | 2022-11-04 | Two-stage interaction method based on FB feedback signals in two-stage switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115642797A CN115642797A (en) | 2023-01-24 |
| CN115642797B true CN115642797B (en) | 2024-01-30 |
Family
ID=84948194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211374103.5A Active CN115642797B (en) | 2022-11-04 | 2022-11-04 | Two-stage interaction method based on FB feedback signals in two-stage switching power supply |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115642797B (en) |
| WO (1) | WO2024093604A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801329A (en) * | 2012-08-09 | 2012-11-28 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof |
| CN105553292A (en) * | 2015-12-31 | 2016-05-04 | 广州金升阳科技有限公司 | Two-stage control method, two-stage controller and AC/DC switching power supply |
| US9774245B1 (en) * | 2016-07-15 | 2017-09-26 | Alitek Technology Corp. | PFC switching power conversion circuit providing low total harmonic distortion |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120014142A1 (en) * | 2010-07-19 | 2012-01-19 | Welland Industrial Co., Ltd. | Power conversion apparatus for correcting power factor |
| US9178439B2 (en) * | 2013-02-26 | 2015-11-03 | Champion Microelectronics Corporation | System and method for limiting output current in a switching power supply |
-
2022
- 2022-11-04 CN CN202211374103.5A patent/CN115642797B/en active Active
-
2023
- 2023-10-06 WO PCT/CN2023/123109 patent/WO2024093604A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801329A (en) * | 2012-08-09 | 2012-11-28 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof |
| CN105553292A (en) * | 2015-12-31 | 2016-05-04 | 广州金升阳科技有限公司 | Two-stage control method, two-stage controller and AC/DC switching power supply |
| US9774245B1 (en) * | 2016-07-15 | 2017-09-26 | Alitek Technology Corp. | PFC switching power conversion circuit providing low total harmonic distortion |
Non-Patent Citations (1)
| Title |
|---|
| 两级式 LED 驱动电源调光控制策略研究;张经纬 等;《电气开关》;62-70 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115642797A (en) | 2023-01-24 |
| WO2024093604A1 (en) | 2024-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8533508B2 (en) | Apparatus and method for reducing the standby power consumption of a display, and display with low standby power consumption | |
| CN102291000B (en) | Switch power supply integrated circuit | |
| US7518889B2 (en) | Method and apparatus for conditional response to a fault condition in a switching power supply | |
| CN101127495B (en) | System and method for switch power supply control | |
| TWI455087B (en) | Low power display control method and associated display controller | |
| US8222867B2 (en) | Battery charging and discharging apparatus and method | |
| KR100977816B1 (en) | Power supply apparatus and control method therefor | |
| CN104868737A (en) | System and method for a switched mode power supply | |
| US20130119895A1 (en) | Led driving circuit and driving controller for controlling the same | |
| CN103715899A (en) | Flyback converter, controller for controlling flyback converter and method | |
| US20200274439A1 (en) | Power conversion system, controller for the same, and method for controlling the same | |
| CN111934352A (en) | Photovoltaic system, control method of turn-off device of photovoltaic system and switch control device | |
| US8004333B2 (en) | Power management and control apparatus for resetting a latched protection in a power supply unit | |
| CN116505922A (en) | Single pulse activation circuit and energy storage device | |
| CN115642797B (en) | Two-stage interaction method based on FB feedback signals in two-stage switching power supply | |
| US9515543B2 (en) | Method for operating a power converter module and a device therefor | |
| CN101996610A (en) | Device and method for reducing standby power consumption of display device and display device with low standby power consumption | |
| TWI422134B (en) | Ultra-low power display control circuit and associated method | |
| TWI422133B (en) | An ultra-low power conversion controller and associated method | |
| TWI397233B (en) | Monitoring circuit of the rear regulator circuit | |
| CN113381644A (en) | MPS high-voltage solid-state soft start system and method based on mms algorithm | |
| CN102237810A (en) | Control method of SMPS (switch mode power supply) and compensating circuit | |
| KR102647905B1 (en) | High-efficiency led display using hybrid(pwm-pfm) voltage control method | |
| CN218041173U (en) | Dual-loop standby control circuit and switching power supply | |
| US20230103028A1 (en) | Charging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |