CN113179032B - Synchronous rectification controller, control method and adapter - Google Patents
Synchronous rectification controller, control method and adapter Download PDFInfo
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- CN113179032B CN113179032B CN202110474568.7A CN202110474568A CN113179032B CN 113179032 B CN113179032 B CN 113179032B CN 202110474568 A CN202110474568 A CN 202110474568A CN 113179032 B CN113179032 B CN 113179032B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 154
- 238000001514 detection method Methods 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000005070 sampling Methods 0.000 abstract description 2
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- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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Abstract
The embodiment of the application relates to the technical field of sampling and discloses a synchronous rectification controller, a control method and an adapter. In the application, a resistor and a detection driving circuit; the first end of the resistor is connected with the first end of the external power supply circuit, and the second end of the resistor is connected with the first end of the detection driving circuit; the second end of the detection driving circuit is connected with the control end of the external switch tube, and the third end of the detection driving circuit is connected with the second end of the first external capacitor; the first end of the external power supply circuit is also connected with the first end of the external switching tube, and the second end of the external switching tube is grounded; the first end of the second external capacitor is grounded, and the second end of the second external capacitor is connected with the second end of the external power supply circuit; the first end of the first external capacitor is connected with the second end of the external switch tube, and the second end of the first external capacitor is connected with the second end of the second external capacitor. The application can greatly reduce the cost for manufacturing the synchronous rectification controller on the basis of keeping the original functions unchanged.
Description
Technical Field
The embodiment of the application relates to the technical field of sampling, in particular to a synchronous rectification controller, a control method and an adapter.
Background
In recent years, with the development of various mobile intelligent device technologies such as mobile phones, notebook computers and tablet computers, the requirements of people on the efficiency, power, volume and the like of an adapter are higher and higher, and in practical application, the synchronous rectification technology is applied to the adapter, so that the efficiency of the adapter is improved, the high power density is realized, and the miniaturization is really achieved.
A schematic structural diagram of a synchronous rectification controller in a current adapter is shown in fig. 1, and the synchronous rectification controller includes: a switching tube M1 and a detection driving module 101; the drain electrode of the switch tube M1 is connected with the external power supply circuit 102, the grid electrode of the switch tube M1 is grounded, the source electrode of the switch tube M1 is connected with the first end of the external capacitor VCC, the second end of the external capacitor VCC is grounded, the first end of the detection driving module 101 is connected with the source electrode of the external switch tube M, the second end of the detection driving module 101 is connected with the grid electrode of the external switch tube M, the drain electrode of the external switch tube M is connected with the external power supply circuit 102, and the source electrode of the external switch tube M is grounded.
However, the voltage input to the switching tube M1 by the external power supply circuit 102 is relatively high, and therefore, the switching tube M1 needs to be manufactured by an ultra-high voltage process, which is expensive, resulting in relatively high process cost of the whole synchronous rectification controller.
Disclosure of Invention
The embodiment of the application aims to provide a synchronous rectification controller, a control method and an adapter, so that the process cost of the synchronous rectification controller is reduced.
To solve the above technical problem, an embodiment of the present application provides a synchronous rectification controller, including: a resistor and a detection driving circuit; the first end of the resistor is connected with the first end of the external power supply circuit, and the second end of the resistor is connected with the first end of the detection driving circuit; the second end of the detection driving circuit is connected with the control end of the external switch tube, and the third end of the detection driving circuit is connected with the second end of the first external capacitor; the first external capacitor is used for supplying power to the detection driving circuit; the detection driving circuit is used for controlling the external switching tube to be turned off when the voltage of the second end of the resistor is positive pressure, and controlling the external switching tube to be turned on when the voltage of the second end of the resistor is negative pressure; the first end of the external power supply circuit is also connected with the first end of the external switching tube, and the second end of the external switching tube is grounded; the first end of the second external capacitor is grounded, and the second end of the second external capacitor is connected with the second end of the external power supply circuit; the first end of the first external capacitor is connected with the second end of the external switch tube, and the second end of the first external capacitor is connected with the second end of the second external capacitor; the second external capacitor is used for supplying power to the first external capacitor.
Embodiments of the present application also provide an adapter comprising: the synchronous rectification controller.
The application is connected with an external power supply circuit through the resistor, and the voltage input to the detection control circuit is reduced under the resistance of the resistor, thereby protecting the detection control circuit; the application also supplies power to the first external capacitor through the second external capacitor, thereby eliminating the problem that the external power supply circuit cannot supply power to the first external capacitor due to the resistance blocking energy transmission; therefore, the application respectively realizes two functions of the switching tube in the related technology through the resistor and the second external capacitor, even if the resistor is manufactured by using the ultra-high voltage technology, the cost is far lower than the cost of manufacturing the switching tube by using the ultra-high voltage technology, the second external capacitor is an element originally existing outside the synchronous rectification controller and used for realizing other functions, and the second external capacitor is used for supplying power to the first external capacitor, so that the cost of the element is not increased; therefore, the application can greatly reduce the cost for manufacturing the synchronous rectification controller on the basis of keeping the original functions unchanged.
In addition, the synchronous rectification controller also comprises a current limiting module; the second end of the first external capacitor is connected with the second end of the second external capacitor through the current limiting module.
In addition, the synchronous rectification controller also comprises a charge pump and a control module; the first end of the charge pump is connected with the second end of the second external capacitor, and the second end of the charge pump is connected with the second end of the first external capacitor; the first end of the control module is connected with the second end of the second external capacitor, the second end of the control module is connected with the current limiting module, and the third end of the control module is connected with the charge pump; the control module is used for controlling the current limiting module to operate under the condition that the output voltage of the second end of the second external capacitor is larger than or equal to a preset threshold value, controlling the charge pump to be closed, and controlling the current limiting module to be closed and controlling the charge pump to be opened under the condition that the output voltage of the second end of the second external capacitor is smaller than the preset threshold value.
In addition, the control module is also connected with the second end of the first external capacitor; the control module is further configured to detect an input voltage value of the second end of the first external capacitor when the charge pump is turned on, and control the charge pump to be turned off when the input voltage value of the second end of the first external capacitor is greater than or equal to the preset threshold value, and control the charge pump to be turned on when the input voltage value of the second end of the first external capacitor is less than the preset threshold value.
In addition, the synchronous rectification controller also comprises a voltage stabilizing diode; and the cathode of the zener diode is connected with the first end of the detection driving circuit, and the anode of the zener diode is grounded.
In addition, the current limiting module is a current source.
In addition, the detection driving circuit is packaged in a chip, and the resistor is externally connected to the chip.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic circuit configuration diagram of a synchronous rectification controller according to the related art;
FIG. 2 is a schematic circuit diagram of a synchronous rectification controller according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a synchronous rectification controller according to an embodiment of the present application;
FIG. 4 is a schematic circuit diagram of a synchronous rectification controller according to an embodiment of the present application;
FIG. 5 is a schematic circuit diagram of a synchronous rectification controller according to an embodiment of the present application;
FIG. 6 is a schematic circuit diagram of a synchronous rectification controller according to an embodiment of the present application;
FIG. 7 is a flow chart of a synchronous rectification control method according to another embodiment of the present application;
fig. 8 is a flowchart of a synchronous rectification control method according to another embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be understood by those of ordinary skill in the art that in various embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the present application. The claimed application may be practiced without these specific details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments can be mutually combined and referred to without contradiction.
A first embodiment of the present application relates to a synchronous rectification controller, and a schematic circuit structure is shown in fig. 2, including: a resistor R, a detection driving circuit 201; the first end of the resistor R is connected with the first end of the external power supply circuit 202, and the second end of the resistor R is connected with the first end of the detection driving circuit 201; the second end of the detection driving circuit 201 is connected with the control end of the external switch tube M, and the third end of the detection driving circuit is connected with the second end of the first external capacitor C1; the first end of the external power supply circuit 202 is also connected with the first end of an external switch tube M, and the second end of the external switch tube M is grounded; the first end of the second external capacitor C2 is grounded, and the second end of the second external capacitor C2 is connected with the second end of the external power supply circuit 202; the first end of the first external capacitor C1 is connected with the second end of the external switch tube M, and the second end of the first external capacitor C1 is connected with the second end of the second external capacitor C2.
Specifically, the first external capacitor C1 is configured to supply power to the detection driving circuit 201; the second external capacitor C2 is used for supplying power to the first external capacitor C1; the detection driving circuit 201 is configured to control the external switch tube M to be turned off when the voltage at the second end of the resistor R is positive, and control the external switch tube M to be turned on when the voltage at the second end of the resistor R is negative.
In the related art, as shown in fig. 1, two switching tubes M1 serve to reduce the voltage input to the synchronous rectification controller to protect other components, and the switching tube M1 does not limit the current flowing into other components, so that the switching tube M1 can transfer the electric energy provided by the external power supply circuit 103 to other components, thereby supplying power to the external capacitor VCC. However, the manufacturing cost of the ultra-high voltage process of the switching tube M1 is high, so that the manufacturing cost of the whole synchronous rectification controller is high.
In this embodiment, the resistor R is connected with the external power supply circuit 202, and under the resistance value of the resistor R, the voltage input to the subsequent detection control circuit 201 is reduced, so as to protect the detection control circuit 201; in the embodiment, the second external capacitor C2 is used for supplying power to the first external capacitor C1, so that the problem that the external power supply circuit 202 cannot supply power to the first external capacitor C1 due to the fact that the resistor R blocks energy transmission is solved; therefore, the application realizes the two functions of the switch tube M1 shown in FIG. 1 through the resistor R and the second external capacitor C2 respectively, even if the resistor is manufactured by using the ultra-high voltage process, the cost is far lower than the cost of manufacturing the switch tube by adopting the ultra-high voltage process, and the second external capacitor C2 is an element originally existing outside the synchronous rectification controller and used for realizing other functions, so that the second external capacitor C2 is used for supplying power to the first external capacitor C1, the cost of the element is not increased, and the cost of manufacturing the synchronous rectification controller is greatly reduced on the basis of keeping the original functions unchanged.
It should be noted that, the output voltage of the second external capacitor C2 is much smaller than the voltage of the external power supply circuit, generally only about ten volts, so that the second end of the first external capacitor C1 transfers energy to the second end of the second external capacitor C2, so that the second external capacitor C2 supplies power to the first external capacitor C1, and the first external capacitor C1 can realize stable charging.
In one embodiment, as shown in fig. 3, which is a schematic circuit diagram of the present embodiment, the synchronous rectification controller further includes a current limiting module 203; the second end of the first external capacitor C1 is connected to the second end of the second external capacitor C2 through the current limiting module 203. After the first external capacitor C1 is charged, the detection driving circuit in the synchronous rectification controller is required to be powered for use, the voltage which can be born by the detection driving circuit is smaller, and if the energy output by the first external capacitor C1 is overlarge, the detection driving circuit is damaged and cannot normally operate; therefore, in this embodiment, the second end of the first external capacitor C1 is connected to the current limiting module 203, so that the input current of the first external capacitor C1 can be ensured to be within a stable range with a proper size, and the energy output by the first external capacitor C1 can be stabilized within a proper range, so that the components in the synchronous rectification controller can be ensured to operate stably.
In one embodiment, as shown in fig. 4, which is a schematic circuit diagram of the present embodiment, the synchronous rectification controller further includes a charge pump 204 and a control module 205; the first end of the charge pump 204 is connected with the second end of the second external capacitor C2, and the second end of the charge pump 204 is connected with the second end of the first external capacitor C1; the first end a of the control module 205 is connected with the second end of the second external capacitor C2, the second end b of the control module 205 is connected with the current limiting module 203, and the third end C of the control module 205 is connected with the charge pump 204; the control module 205 is configured to control the current limiting module 203 to operate and control the charge pump 204 to be turned off when the output voltage of the second end of the second external capacitor C2 is greater than or equal to a preset threshold, and control the current limiting module 203 to be turned off and control the charge pump 204 to be turned on when the output voltage of the second end of the second external capacitor C2 is less than the preset threshold. In this embodiment, by setting two branches of the charge pump 204 and the current limiting module 203, when the voltage at the second end of the second external capacitor C2 is greater than or equal to a preset threshold, it indicates that the second external capacitor C2 has enough electric energy to charge the first external capacitor C1, at this time, the control module 205 controls the current limiting module 203 to operate, and controls the charge pump 204 to be turned off, so as to limit the current input to the first external capacitor C1 to be within a stable range, and avoid the excessive current input to the first external capacitor C1; when the voltage at the second end of the second external capacitor C2 is smaller than the preset threshold, it indicates that the electric energy provided by the second external capacitor C2 is smaller, if the power is continuously supplied to the first external capacitor C1, the output voltage of the first external capacitor C1 is also correspondingly reduced, the detection driving circuit 201 of the synchronous rectification controller cannot work normally, at this time, the control module 205 controls the current limiting module 203 to be turned off, controls the charge pump 204 to be turned on, and increases the voltage input to the first external capacitor C1, so that the first external capacitor C1 can be charged normally, and the detection driving circuit of the synchronous rectification controller can also operate normally.
In this embodiment, by setting the charge pump 204 and the current limiting module 203, the input current value of the first external capacitor C1 is within a certain range, the first external capacitor C1 can be charged stably, and the output voltage of the first external capacitor C1 is also relatively stable, so that the detection driving circuit of the synchronous rectification controller can also operate normally.
It should be noted that, when the current limiting module 203 is turned off, the electric energy of the second external capacitor C2 cannot reach the first external capacitor C1 through the current limiting module 203; when the charge pump 204 is turned off, the electric energy of the second external capacitor C2 cannot reach the first external capacitor C1 through the charge pump 204.
It should be noted that, when the voltage at the second end of the second external capacitor C2 is smaller than the preset threshold, the current output by the second external capacitor C2 is also smaller, and the current output by the second external capacitor C2 can also supply power to the first external capacitor C1, and the first external capacitor C1 cannot be provided with larger energy to cause damage to the functional module of the synchronous rectification controller; the charge pump 204 only increases the output voltage of the second external capacitor C2, but does not increase the output current of the second external capacitor C2, so that the input voltage of the charge pump 204 is ensured to be stable, and the problem that the functional module of the synchronous rectification controller is damaged due to the fact that the input current of the charge pump 204 is too high is avoided.
In one embodiment, as shown in fig. 5, which is a schematic circuit diagram of the present embodiment, the control module 205 is further connected to the second end of the first external capacitor C1 through a port d; the control module 205 is further configured to detect an input voltage value of the second end of the first external capacitor C1 when the charge pump 204 is turned on, and control the charge pump 204 to be turned off when the voltage value of the second end of the first external capacitor C1 is greater than or equal to a preset threshold, and control the charge pump 204 to be turned on when the voltage value of the second end of the first external capacitor C1 is less than the preset threshold. In this embodiment, under the condition that the charge pump 204 is turned on, the control module 205 detects the input voltage value of the second end of the first external capacitor C1, and controls the charge pump 204 to be turned on or off, so as to ensure that the input voltage value of the second end of the first external capacitor C1 can be stabilized at a preset threshold, improve the stability of the input voltage of the second end of the first external capacitor C1, correspondingly, the output voltage of the first external capacitor C1 is further stabilized, and the detection driving circuit of the synchronous rectification controller can also work stably under the power supply of the first external capacitor C1.
In one embodiment, as shown in fig. 6, which is a schematic circuit diagram of the present embodiment, the synchronous rectification controller further includes a zener diode D; the cathode of the zener diode D is connected to the first end of the detection driving circuit 201, and the anode of the zener diode D is grounded. According to the embodiment, the voltage stabilizing diode is arranged, so that the voltage input to the detection driving module can be stabilized at a fixed voltage value, the voltage received by the detection driving module is ensured to be stable, and the detection accuracy of the detection driving circuit is improved.
In one embodiment, the current limiting module 203 is a current source.
In one embodiment, the detection driving circuit is packaged in a chip, and the resistor is externally connected to the chip. Because the resistor needs to bear higher voltage and needs to be manufactured by adopting an ultra-high voltage process, the resistor is externally connected to the chip, the ultra-high voltage process is not needed in the process of manufacturing the chip, and the cost of manufacturing the resistor on the chip by adopting the ultra-high voltage process is higher than that of manufacturing the resistor by singly using the ultra-high voltage process, so that the manufacturing cost of the synchronous rectification controller can be further saved by externally connecting a resistor on the chip.
It should be noted that, each module involved in this embodiment is a logic module, and in practical application, one logic unit may be one physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present application, units less closely related to solving the technical problem presented by the present application are not introduced in the present embodiment, but it does not indicate that other units are not present in the present embodiment.
Another embodiment of the present application relates to a synchronous rectification control method.
Fig. 7 is a schematic flow chart of a synchronous rectification control method according to the present embodiment, which includes the following steps:
Step 301, obtaining an output voltage of a second end of a second external capacitor.
Step 302, determining whether the output voltage of the second end of the second external capacitor is greater than or equal to a preset threshold. If yes, go to step 303, if no, go to step 304.
Step 303, controlling the current limiting module to operate and controlling the charge pump to be turned off.
And 304, controlling the current limiting module to be closed and controlling the charge pump to be opened.
It is to be noted that this embodiment is an embodiment of a method corresponding to the synchronous rectification controller of the previous embodiment, and this embodiment may be implemented in cooperation with the previous embodiment. The related technical details mentioned in the previous embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the above embodiment.
According to the embodiment, the charge pump and the current limiting module are arranged, so that the input current value of the first external capacitor is within a certain range, the first external capacitor can be charged stably, the output voltage of the first external capacitor is stable, and the detection driving circuit of the synchronous rectification controller can operate normally.
In one embodiment, the control current limiting module is turned off, and after the control charge pump is turned on, the method further comprises: detecting an input voltage value of a second end of the first external capacitor; the specific flow chart of this embodiment is shown in fig. 8, and specifically includes the following steps:
step 401, obtaining an output voltage of a second end of the second external capacitor.
Step 402, determining whether the output voltage of the second end of the second external capacitor is greater than or equal to a preset threshold. If yes, go to step 403, if no, go to step 404.
And step 403, controlling the current limiting module to operate and controlling the charge pump to be turned off.
Step 404, the current limiting module is controlled to be turned off, and the charge pump is controlled to be turned on. Step 405 is then entered.
Step 405, determining whether the input voltage value of the second end of the first external capacitor is greater than or equal to a preset threshold, if yes, entering step 406; if not, step 407 is entered.
Step 406, the charge pump is controlled to turn off.
Step 407, controlling the charge pump to turn on.
The steps 401 to 404 are the same as the steps 301 to 304, and are not repeated here to reduce the repetition.
It is to be noted that this embodiment is also a method embodiment corresponding to the synchronous rectification controller of the previous embodiment, and this embodiment may be implemented in cooperation with the previous embodiment. The related technical details mentioned in the previous embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the above embodiment.
According to the embodiment, under the condition that the charge pump is started, the control module is used for detecting the input voltage value of the second end of the first external capacitor and controlling the charge pump to be started or stopped, so that the input voltage value of the second end of the first external capacitor can be ensured to be stabilized at a preset threshold value, the stability of the input voltage of the second end of the first external capacitor is improved, correspondingly, the output voltage of the first external capacitor is further stabilized, and the detection driving circuit of the synchronous rectification controller can work stably under the power supply of the first external capacitor.
The above steps of the methods are divided, for clarity of description, and may be combined into one step or split into multiple steps when implemented, so long as they include the same logic relationship, and they are all within the protection scope of this patent; it is within the scope of this patent to add insignificant modifications to the algorithm or flow or introduce insignificant designs, but not to alter the core design of its algorithm and flow.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the application and that various changes in form and details may be made therein without departing from the spirit and scope of the application.
Claims (10)
1. A synchronous rectification controller, comprising: a resistor and a detection driving circuit;
The first end of the resistor is connected with the first end of the external power supply circuit, and the second end of the resistor is connected with the first end of the detection driving circuit;
The second end of the detection driving circuit is connected with the control end of the external switch tube, and the third end of the detection driving circuit is connected with the second end of the first external capacitor; the first external capacitor is used for supplying power to the detection driving circuit; the detection driving circuit is used for controlling the external switching tube to be turned off when the voltage of the second end of the resistor is positive pressure, and controlling the external switching tube to be turned on when the voltage of the second end of the resistor is negative pressure;
The first end of the external power supply circuit is also connected with the first end of the external switching tube, and the second end of the external switching tube is grounded; the first end of the second external capacitor is grounded, and the second end of the second external capacitor is connected with the second end of the external power supply circuit;
the first end of the first external capacitor is connected with the second end of the external switch tube, and the second end of the first external capacitor is connected with the second end of the second external capacitor; the second external capacitor is used for supplying power to the first external capacitor.
2. The synchronous rectification controller of claim 1, further comprising a current limiting module;
The second end of the first external capacitor is connected with the second end of the second external capacitor through the current limiting module.
3. The synchronous rectification controller of claim 2, further comprising a charge pump, a control module;
the first end of the charge pump is connected with the second end of the second external capacitor, and the second end of the charge pump is connected with the second end of the first external capacitor;
The first end of the control module is connected with the second end of the second external capacitor, the second end of the control module is connected with the current limiting module, and the third end of the control module is connected with the charge pump;
The control module is used for controlling the current limiting module to operate under the condition that the output voltage of the second end of the second external capacitor is larger than or equal to a preset threshold value, controlling the charge pump to be closed, and controlling the current limiting module to be closed and controlling the charge pump to be opened under the condition that the output voltage of the second end of the second external capacitor is smaller than the preset threshold value.
4. The synchronous rectification controller of claim 3, wherein said control module is further connected to a second end of said first external capacitor;
The control module is further configured to detect an input voltage value of the second end of the first external capacitor when the charge pump is turned on, and control the charge pump to be turned off when the input voltage value of the second end of the first external capacitor is greater than or equal to the preset threshold value, and control the charge pump to be turned on when the input voltage value of the second end of the first external capacitor is less than the preset threshold value.
5. The synchronous rectification controller of claim 1, further comprising a zener diode; and the cathode of the zener diode is connected with the first end of the detection driving circuit, and the anode of the zener diode is grounded.
6. The synchronous rectification controller of claim 2, wherein said current limiting module is a current source.
7. The synchronous rectification controller of claim 1, wherein said detection driving circuit is packaged in a chip, said resistor being externally connected to said chip.
8. The synchronous rectification control method of the synchronous rectification controller is characterized by being applied to a control module of the synchronous rectification controller; the synchronous rectification controller includes: the device comprises a resistor, a detection driving circuit, a current limiting module and a charge pump; the first end of the resistor is connected with the first end of the external power supply circuit, and the second end of the resistor is connected with the first end of the detection driving circuit; the second end of the detection driving circuit is connected with the control end of the external switch tube, and the third end of the detection driving circuit is connected with the second end of the first external capacitor; the first end of the external power supply circuit is also connected with the first end of the external switching tube, and the second end of the external switching tube is grounded; the first end of the second external capacitor is grounded, and the second end of the second external capacitor is connected with the second end of the external power supply circuit; the first end of the first external capacitor is connected with the second end of the external switch tube, and the second end of the first external capacitor is connected with the second end of the second external capacitor through the current limiting module; the first end of the charge pump is connected with the second end of the second external capacitor, and the second end of the charge pump is connected with the second end of the first external capacitor; the first end of the control module is connected with the second end of the second external capacitor, the second end of the control module is connected with the current limiting module, and the third end of the control module is connected with the charge pump;
The method comprises the following steps:
Obtaining the output voltage of the second end of the second external capacitor;
controlling the current limiting module to operate and controlling the charge pump to be turned off under the condition that the output voltage of the second end of the second external capacitor is larger than or equal to a preset threshold value;
and under the condition that the output voltage of the second end of the second external capacitor is smaller than the preset threshold value, controlling the current limiting module to be closed and controlling the charge pump to be opened.
9. The synchronous rectification control method according to claim 8, wherein said control module is further connected to a second end of said first external capacitor;
and after the current limiting module is controlled to be closed and the charge pump is controlled to be opened, the method further comprises the steps of:
detecting an input voltage value of a second end of the first external capacitor;
controlling the charge pump to be turned off under the condition that the input voltage value of the second end of the first external capacitor is larger than or equal to the preset threshold value;
And controlling the charge pump to be started under the condition that the input voltage value of the second end of the first external capacitor is smaller than the preset threshold value.
10. An adapter, comprising: the synchronous rectification controller of any one of claims 1 to 7.
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| CN113572355B (en) * | 2021-09-26 | 2021-12-14 | 苏州贝克微电子有限公司 | Power supply circuit with stable output voltage |
| CN116979819A (en) * | 2022-04-22 | 2023-10-31 | 深圳英集芯科技股份有限公司 | Power supply circuit of synchronous rectifier, power supply device and power supply equipment |
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