CN113179032A - Synchronous rectification controller, control method and adapter - Google Patents
Synchronous rectification controller, control method and adapter Download PDFInfo
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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
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 present application, a resistor, a detection drive 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 switch tube, and the second end of the external switch 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 method and the device can greatly reduce the cost for manufacturing the synchronous rectification controller on the basis of keeping the original function 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, tablet computers and the like, people have higher and higher requirements on the efficiency, power, volume and the like of the adapter, and in practical application, a synchronous rectification technology is applied to the adapter, so that the efficiency of the adapter is improved, the high power density can be 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, where the synchronous rectification controller includes: a switching tube M1 and a detection driving module 101; the external power supply circuit 102 is connected to the drain electrode of switch tube M1, switch tube M1's grid ground connection, the first end of external electric capacity VCC is connected to the source electrode of switch tube M1, the second end ground connection of external electric capacity VCC, the source electrode of external switch tube M is connected to the first end that detects drive module 101, the grid of external switch tube M is connected to the second end that detects drive module 101, external power supply circuit 102 is connected to external switch tube M's drain electrode, external switch tube M's source ground connection.
However, the voltage input to the switching tube M1 by the external power supply circuit 102 is large, and therefore, the switching tube M1 needs to be manufactured by an ultra-high voltage process, but the manufacturing cost of the switching tube by the ultra-high voltage process is expensive, which results in high process cost of the whole synchronous rectification controller.
Disclosure of Invention
An object of the embodiments of the present application is 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 drive circuit; the first end of the resistor is connected with the first end of an 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 an external switch tube, and the third end of the detection driving circuit is connected with the second end of a 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 switch tube to be switched off when the voltage of the second end of the resistor is positive voltage, and controlling the external switch tube to be switched on when the voltage of the second end of the resistor is negative voltage; the first end of the external power supply circuit is also connected with the first end of the external switch tube, and the second end of the external switch 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 further provide an adapter, including: the synchronous rectification controller is provided.
The detection control circuit is connected with the external power supply circuit through the resistor, and the voltage input to the detection control circuit is reduced under the action of the resistance value of the resistor, so that the detection control circuit is protected; the first external capacitor is also powered through the second external capacitor, so that the problem that the external power supply circuit cannot supply power to the first external capacitor due to the fact that energy transmission is blocked by the resistor is solved; therefore, the two functions of the switching tube in the related technology are respectively realized through the resistor and the second external capacitor, even if the resistor is manufactured by using an ultrahigh voltage process, the cost is far lower than the cost for manufacturing the switching tube by using the ultrahigh voltage process, the second external capacitor is a component originally existing outside the synchronous rectification controller and used for realizing other functions, the second external capacitor is used for supplying power to the first external capacitor, and the cost of the component is not increased; therefore, the cost for manufacturing the synchronous rectification controller can be greatly reduced on the basis of keeping the original function unchanged.
In addition, the synchronous rectification controller also comprises a current limiting module; 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.
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 and controlling the charge pump to be closed under the condition that the output voltage of the second end of the second external capacitor is greater than or equal to a preset threshold value, 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 a 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, 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, 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.
In addition, the synchronous rectification controller also comprises a voltage stabilizing diode; the cathode of the voltage stabilizing diode is connected with the first end of the detection driving circuit, and the anode of the voltage stabilizing 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 in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
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 schematic flow chart diagram of a synchronous rectification control method according to another embodiment of the present application;
fig. 8 is a flowchart illustrating a synchronous rectification control method according to another embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present application, and the embodiments may be mutually incorporated and referred to without contradiction.
A first embodiment of the present application relates to a synchronous rectification controller, and a specific circuit structure diagram is shown in fig. 2, including: a resistor R, a detection drive circuit 201; a first end of the resistor R is connected to a first end of the external power supply circuit 202, and a second end of the resistor R is connected to a 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; a first end of the second external capacitor C2 is grounded, and a second end of the second external capacitor C2 is connected to a second end of the external power supply circuit 202; the first end of the first external capacitor C1 is connected to the second end of the external switch tube M, and the second end of the first external capacitor C1 is connected to the second end of the second external capacitor C2.
Specifically, the first external capacitor C1 is used 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 switching tube M to turn off when the voltage at the second end of the resistor R is a positive voltage, and control the external switching tube M to turn on when the voltage at the second end of the resistor R is a negative voltage.
In the related art, as shown in fig. 1, the switching tube M1 has two functions, one is to reduce the voltage input to the synchronous rectification controller and protect other components, and the other is that the switching tube M1 does not limit the current flowing into other components, and 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 extra-high voltage process of the switching tube M1 is relatively high, so that the manufacturing cost of the whole synchronous rectification controller is relatively high.
In this embodiment, the resistor R is connected to the external power supply circuit 202, and the voltage input to the subsequent detection control circuit 201 is reduced under the resistance of the resistor R, so as to protect the detection control circuit 201; the embodiment also supplies power to the first external capacitor C1 through the second external capacitor C2, thereby eliminating 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; it can be seen that, this application has realized two functions of the switch tube M1 shown in fig. 1 respectively through resistance R and second external capacitor C2, even use superhigh pressure technology to make resistance, its cost is also far less than the cost of adopting superhigh pressure technology to make switch tube, and second external capacitor C2 is originally existing outside the synchronous rectification controller and is used for realizing the components and parts of other functions, consequently, use second external capacitor C2 to supply power for first external capacitor C1, and the cost of component is not increased, consequently, this application is on the basis that keeps original function not changing, the cost of preparation synchronous rectification controller has been reduced to very big limit.
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, and generally has only ten or several volts, so that in this embodiment, energy is transmitted to the second terminal of the second external capacitor C2 through the second terminal of the first external capacitor C1, 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 an embodiment, as shown in fig. 3, which is a schematic circuit diagram of this embodiment, the synchronous rectification controller further includes a current limiting module 203; the second terminal of the first external capacitor C1 is connected to the second terminal of the second external capacitor C2 through the current limiting module 203. Because the first external capacitor C1 needs to supply power to the detection driving circuit inside the synchronous rectification controller after charging, and the voltage that the detection driving circuit can bear is small, if the energy output by the first external capacitor C1 is too large, the detection driving circuit is damaged and cannot operate normally; therefore, in this embodiment, the current limiting module 203 is connected to the second end of the first external capacitor C1, so that the input current of the first external capacitor C1 can be ensured to be within a stable range with a proper magnitude, the energy output by the first external capacitor C1 can also be stabilized within a proper range, and the components in the synchronous rectification controller can be ensured to stably operate.
In an embodiment, as shown in fig. 4, which is a schematic circuit diagram of this 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 to the second end of the second external capacitor C2, and the second end of the charge pump 204 is connected to the second end of the first external capacitor C1; the first end a of the control module 205 is connected to the second end of the second external capacitor C2, the second end b of the control module 205 is connected to the current limiting module 203, and the third end C of the control module 205 is connected to 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 turn off when the output voltage of the second terminal of the second external capacitor C2 is greater than or equal to a preset threshold, and control the current limiting module 203 to turn off and control the charge pump 204 to turn on when the output voltage of the second terminal of the second external capacitor C2 is less than the preset threshold. In the embodiment, by arranging the 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 the preset threshold, it indicates that the second external capacitor C2 has enough electric energy to charge the first external capacitor C1, and at this time, the control module 205 controls the current limiting module 203 to operate and controls the charge pump 204 to turn off, so as to limit the current input to the first external capacitor C1 within a stable range and avoid an excessive current input to the first external capacitor C1; when the voltage of the second end of the second external capacitor C2 is smaller than the preset threshold, it is indicated that the electric energy provided by the second external capacitor C2 is smaller, if the first external capacitor C1 is continuously supplied with power, the output voltage of the first external capacitor C1 is correspondingly reduced, the detection driving circuit 201 of the synchronous rectification controller cannot normally work, at this time, the control module 205 controls the current limiting module 203 to be closed, the charge pump 204 is controlled to be turned on, the voltage input to the first external capacitor C1 is increased, the first external capacitor C1 can be normally charged, and the detection driving circuit of the synchronous rectification controller can also normally work.
In this embodiment, by setting the two branches of the charge pump 204 and the current limiting module 203, the input current value of the first external capacitor C1 can be in a certain range, the first external capacitor C1 can be charged stably, the output voltage of the first external capacitor C1 is also stable, and 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 power 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 power 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, it indicates that 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 functional module of the synchronous rectification controller cannot be damaged due to the larger energy provided by the first external capacitor C1; the charge pump 204 only increases the output voltage of the second external capacitor C2, and does not increase the output current of the second external capacitor C2, so that the input voltage of the charge pump 204 is stable, and the problem that the functional module of the synchronous rectification controller is damaged by too high input current of the charge pump 204 is avoided.
In an embodiment, as shown in fig. 5, which is a schematic circuit structure diagram of this embodiment, the control module 205 is further connected to a 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 at the second end of the first external capacitor C1 when the charge pump 204 is turned on, control the charge pump 204 to turn off when the voltage value at 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 turn on when the voltage value at 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 is further used to detect the input voltage value of the second end of the first external capacitor C1, and control whether the charge pump 204 is turned on or off, thereby ensuring that the input voltage value of the second end of the first external capacitor C1 can be stabilized at the preset threshold, improving the stability of the input voltage of the second end of the first external capacitor C1, and accordingly, the output voltage of the first external capacitor C1 is further stabilized, and the detection driving circuit of the synchronous rectification controller can also stably operate under the power supply of the first external capacitor C1.
In an embodiment, as shown in fig. 6, which is a schematic circuit diagram of this embodiment, the synchronous rectification controller further includes a voltage regulator 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. This embodiment can stabilize the voltage input to detecting drive module at a fixed voltage value through setting up zener diode, ensures that the voltage that detects drive module received is comparatively stable, improves the accuracy that detects drive circuit's detection.
In one embodiment, 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 ultrahigh voltage process, the resistor is externally connected onto the chip in the embodiment, the ultrahigh voltage process is not needed in the manufacturing process of the chip, and the cost for manufacturing the resistor by using the ultrahigh voltage process on the chip is higher than the cost for manufacturing the resistor by independently adopting the ultrahigh voltage process, so that the manufacturing cost of the synchronous rectification controller can be further saved by externally connecting the resistor on the chip.
It should be noted that, all the modules involved in this embodiment are logic modules, and in practical application, one logic unit may be one physical unit, may also be a part of one physical unit, and may also be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present application, a unit that is not so closely related to solving the technical problem proposed by the present application is not introduced in the present embodiment, but this does not indicate that there is no other unit in the present embodiment.
Another embodiment of the present application relates to a synchronous rectification control method.
As shown in fig. 7, a schematic flow chart of the synchronous rectification control method of this embodiment includes the following steps:
And step 303, controlling the current limiting module to operate, and controlling the charge pump to be closed.
And step 304, controlling the current limiting module to be closed and controlling the charge pump to be started.
It should be understood that the present embodiment is a method embodiment corresponding to the synchronous rectification controller of the previous embodiment, and the present embodiment can be implemented in cooperation with the previous embodiment. The related technical details mentioned in the previous embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the above embodiment.
This embodiment can be through setting up two branches of charge pump and current-limiting module, can be so that the input current value of first external electric capacity is within certain scope, and first external electric capacity can charge steadily, and the output voltage of first external electric capacity is also comparatively stable for synchronous rectifier controller's detection drive circuit also can normal operating.
In one embodiment, after controlling the current limiting module to be turned off and controlling the charge pump to be turned on, the method further includes: detecting an input voltage value of a second end of the first external capacitor; the specific flow diagram of this embodiment is shown in fig. 8, and specifically includes the following steps:
And step 403, controlling the current limiting module to operate, and controlling the charge pump to be closed.
And step 404, controlling the current limiting module to be closed and controlling the charge pump to be started. Step 405 is then entered.
In step 406, the charge pump is controlled to be turned off.
The steps 401 to 404 are the same as the steps 301 to 304, and are not described herein again to reduce the repetition.
It should be understood that the present embodiment is also a method embodiment corresponding to the synchronous rectification controller of the previous embodiment, and the present embodiment can be implemented in cooperation with the previous embodiment. The related technical details mentioned in the previous embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the above embodiment.
In the present embodiment, under the condition that the charge pump is turned on, the input voltage value of the second end of the first external capacitor is detected through the control module, and the charge pump is controlled to be turned on or turned off, so as to ensure that the input voltage value of the second end of the first external capacitor can be stabilized at the preset threshold value, thereby improving the stability of the input voltage of the second end of the first external capacitor, accordingly, the output voltage of the first external capacitor is further stabilized, and the detection driving circuit of the synchronous rectification controller can also stably work under the power supply of the first external capacitor.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice.
Claims (10)
1. A synchronous rectification controller, comprising: a resistor and a detection drive circuit;
the first end of the resistor is connected with the first end of an 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 an external switch tube, and the third end of the detection driving circuit is connected with the second end of a 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 switch tube to be switched off when the voltage of the second end of the resistor is positive voltage, and controlling the external switch tube to be switched on when the voltage of the second end of the resistor is negative voltage;
the first end of the external power supply circuit is also connected with the first end of the external switch tube, and the second end of the external switch 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;
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.
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 and controlling the charge pump to be closed under the condition that the output voltage of the second end of the second external capacitor is greater than or equal to a preset threshold value, 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 the control module is further connected to a second terminal 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, 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, 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.
5. The synchronous rectification controller of claim 1, further comprising a zener diode; the cathode of the voltage stabilizing diode is connected with the first end of the detection driving circuit, and the anode of the voltage stabilizing diode is grounded.
6. The synchronous rectification controller of claim 1, wherein the current limiting module is a current source.
7. The synchronous rectification controller of claim 1, wherein the detection driving circuit is packaged in a chip, and the resistor is externally connected to the chip.
8. The synchronous rectification control method of claim 1, wherein the control module of the synchronous rectification controller; the synchronous rectification controller includes: the circuit 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 an 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 an external switch tube, and the third end of the detection driving circuit is connected with a first external capacitor; the first end of the external power supply circuit is also connected with the first end of the external switch tube, and the second end of the external switch 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:
acquiring the output voltage of the second end of the second external capacitor;
under the condition that the output voltage of the second end of the second external capacitor is greater than or equal to a preset threshold value, controlling the current limiting module to operate and controlling the charge pump to be turned off;
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 started.
9. The synchronous rectification control method according to claim 8, wherein the control module is further connected to a second end of the first external capacitor;
the controlling the current limiting module to close and controlling the charge pump to open further comprises:
detecting an input voltage value of a second end of the first external capacitor;
under the condition that the input voltage value of the second end of the first external capacitor is greater than or equal to the preset threshold value, controlling the charge pump to be closed;
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: a synchronous rectification controller as claimed in any one of claims 1 to 7.
Priority Applications (1)
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| CN202110474568.7A CN113179032B (en) | 2021-04-29 | Synchronous rectification controller, control method and adapter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110474568.7A CN113179032B (en) | 2021-04-29 | Synchronous rectification controller, control method and adapter |
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| Publication Number | Publication Date |
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| CN113179032A true CN113179032A (en) | 2021-07-27 |
| CN113179032B CN113179032B (en) | 2024-05-03 |
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| CN113572355A (en) * | 2021-09-26 | 2021-10-29 | 苏州贝克微电子有限公司 | Power supply circuit with stable output voltage |
| CN114531014A (en) * | 2022-04-22 | 2022-05-24 | 深圳英集芯科技股份有限公司 | Power supply circuit, device and equipment of synchronous rectifier |
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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 |
| CN114531014A (en) * | 2022-04-22 | 2022-05-24 | 深圳英集芯科技股份有限公司 | Power supply circuit, device and equipment of synchronous rectifier |
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