CN216751521U - Switching power supply circuit based on synchronous rectification - Google Patents
Switching power supply circuit based on synchronous rectification Download PDFInfo
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- CN216751521U CN216751521U CN202123194556.3U CN202123194556U CN216751521U CN 216751521 U CN216751521 U CN 216751521U CN 202123194556 U CN202123194556 U CN 202123194556U CN 216751521 U CN216751521 U CN 216751521U
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Abstract
The application relates to a switching power supply circuit based on synchronous rectification, it includes rectification filter module, feedback control module, vary voltage module and synchronous rectification module, rectification filter module's input is coupled in alternating current power supply, vary voltage module is coupled in rectification filter module, feedback control module is coupled in the voltage of vary voltage module in order to detect rectification filter module output to vary voltage module, feedback control module still is coupled in rectification filter module in order to output feedback control signal, synchronous rectification module is coupled in the voltage of vary voltage module after with the input vary voltage, synchronous rectification module is used for exporting +5V voltage. The current output capacity of the switching power supply circuit is improved, and the conversion efficiency is improved.
Description
Technical Field
The application relates to the technical field of switching power supply circuits, in particular to a switching power supply circuit based on synchronous rectification.
Background
With the development of electronic technology, the working voltage of the circuit is lower and lower, the current is higher and higher, the low-voltage operation is beneficial to reducing the whole power consumption of the circuit, and the loss of the output end of the circuit is increased under the condition of low voltage and large current output.
At present, in the design of a switching power supply circuit, a fast recovery diode such as a schottky diode is generally coupled in the switching power supply circuit, and the characteristic of the extreme reverse recovery time of the schottky diode is utilized to perform high-frequency rectification in the switching power supply circuit for reducing the output loss in the switching power supply circuit and improving the power supply efficiency.
However, with the development of the switching power supply circuit, the loss of the output end rectifying tube of the switching power supply circuit is particularly prominent, and a schottky diode is adopted to generate a large voltage drop, so that the rectifying loss of the switching power supply circuit is increased, the proportion of the total loss of the power supply is large, the current output capacity of the switching power supply circuit is reduced, and the power supply efficiency cannot meet the customer requirements, so that a certain improvement space exists.
SUMMERY OF THE UTILITY MODEL
In order to improve switching power supply circuit's current output ability, promote conversion efficiency, reduce the rectification loss, this application provides a switching power supply circuit based on synchronous rectification.
The application provides a switching power supply circuit based on synchronous rectification adopts following technical scheme:
the utility model provides a switching power supply circuit based on synchronous rectification, includes synchronous rectification module, feedback control module, vary voltage module and rectification filter module, alternating current mains voltage is coupled to the rectification filter module, vary voltage module coupling is in order to receive the high voltage in the rectification filter module, feedback control module coupling is in order to receive the voltage of rectification filter output in the vary voltage module, feedback control module still is coupled in the rectification filter module, the coupling of vary voltage module is in order to output voltage after the vary voltage to synchronous rectification module in the synchronous rectification module, synchronous rectification module is used for exporting +5V direct current voltage.
By adopting the technical scheme, the rectifying and filtering module is coupled with an alternating current voltage source to input alternating current voltage, the rectifying and filtering module converts the input alternating current voltage into direct current voltage, the rectifying and filtering module carries out filtering processing on the direct current voltage and then outputs the direct current voltage to the voltage transformation module, the feedback control module receives the filtered direct current voltage output by the rectifying and filtering module, the feedback control module detects the voltage output by the rectifying and filtering module to the voltage transformation module and outputs a feedback control signal to the rectifying and filtering module, the rectifying and filtering module is driven to adjust the voltage input into the voltage transformation module, the voltage transformation module outputs the voltage after voltage transformation to the synchronous rectifying module, the rectifying loss of the output end of the whole switching power supply circuit is reduced through the synchronous rectifying module, the current output capacity of the switching power supply circuit is improved, and the conversion efficiency is improved.
Optionally, the rectification and filtering module includes a rectification and voltage stabilization submodule and a filtering submodule, the rectification and voltage stabilization submodule includes a first ac input end, a second ac input end, a positive output end and a negative output end, the first ac input end is coupled to the live wire, the second ac input end is coupled to the zero line, the positive output end is coupled to the filtering submodule to output a dc voltage, and the negative output end is coupled to the filtering submodule to provide a ground terminal.
By adopting the technical scheme, the first alternating current input end and the second alternating current input end of the rectification voltage-stabilizing submodule receive alternating voltage, the positive output end of the rectification voltage-stabilizing submodule outputs direct voltage, the filtering submodule outputs direct voltage, and the negative output end of the rectification voltage-stabilizing submodule is used as a grounding end, so that the alternating voltage is converted into the direct voltage to be output, and the circuit integration level is high.
Optionally, the filter sub-module is coupled to the rectifying and voltage-stabilizing sub-module, the filter sub-module includes a first capacitor C1, a first inductor L1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a voltage-stabilizing diode D5, a fourth capacitor C4, and a second inductor L2, the first capacitor C1 is connected in series to the first inductor L1, the other end of the first inductor L1 is coupled to the third capacitor C3, the other end of the third capacitor C3 is coupled to the second inductor L2, the other end of the second inductor L2 is coupled to the first capacitor C1, a connection node between the first capacitor C1 and the first inductor L1 is coupled to an anode output terminal of the rectifying and voltage-stabilizing sub-module, a connection node between the second inductor L2 and the first capacitor C1 is coupled to a cathode output terminal of the rectifying and voltage-stabilizing sub-module, a connection node between the third capacitor C366 and the first inductor L1 is coupled to the first resistor R1, the other end of the first resistor R1 is coupled to a second resistor R2, the other end of the second resistor R2 is coupled to a zener diode D5, the fourth capacitor C4 is connected in parallel to two ends of the first resistor R1, the second capacitor C2 is connected in parallel to two ends of the third capacitor C3, two ends of the first inductor L1 are also connected in parallel to a third resistor R3, a connection node between the fourth capacitor C4 and the first resistor R1 is coupled to a transformer module, and a cathode of the zener diode D5 is coupled to the transformer module.
By adopting the technical scheme, the connecting node of the first capacitor C1 and the first inductor L1 receives the direct-current voltage output by the rectification and voltage stabilization submodule, the received direct-current voltage is filtered through the first capacitor C1, the first inductor L1, the second capacitor C2, the third capacitor C3 and the second inductor L2, and the filtered direct-current voltage is output to the voltage transformation module through the connecting node of the first resistor R1 and the fourth capacitor C4, so that the voltage filtering function is realized.
Optionally, the transforming module includes a transformer T1, the transformer T1 includes an input terminal, a feedback terminal and an output terminal, the input terminal of the transformer T1 is coupled to the rectifying and filtering module, the feedback terminal of the transformer T1 is coupled to the feedback control module, and the output terminal of the transformer T1 is coupled to the synchronous rectifying module.
By adopting the technical scheme, the input end of the transformer T1 inputs the direct-current voltage output by the rectifying and filtering module, the output end of the transformer T1 outputs the voltage after voltage transformation to the synchronous rectifying module, and the feedback end of the transformer T1 outputs the direct-current voltage output by the rectifying and filtering module to the feedback control module, so that the voltage transformation function is realized.
Optionally, the feedback control module includes a first chip U1, an input end of the first chip U1 is coupled to the feedback end of the transformer T1, a zener diode D6 and a fifth capacitor C5 are coupled between the input end of the first chip U1 and the feedback end of the transformer T1, a fourth resistor R4 is connected in series between the zener diode D6 and the input end of the first chip U1, the other end of the fourth resistor R4 is coupled to the fifth capacitor C5, and an output end of the first chip U1 is coupled to a cathode of the zener diode D5.
By adopting the technical scheme, the input end of the first chip U1 receives the direct-current voltage output to the transformer T1 by the rectifying and filtering module output by the feedback end of the transformer T1, the first chip U1 is electrified to work, the direct-current voltage output to the transformer T1 by the rectifying and filtering module is detected, the feedback control signal is output to the rectifying and filtering module through the output end of the first chip U1, so that the rectifying and filtering module adjusts the output direct-current voltage, and when the output direct-current voltage is too high, the first chip U1 can carry out overvoltage protection, so that the rectifying and filtering module reduces the output direct-current voltage; when the output direct-current voltage is too low, the first chip U1 realizes under-voltage protection, so that the rectifying and filtering module increases the output direct-current voltage to realize a feedback control function.
Optionally, the first chip U1 includes a sampling end, a fifth resistor R5 is coupled to the sampling end of the first chip U1, the other end of the fifth resistor R5 is coupled to a connection node between the feedback end of the transformer T1 and the zener diode D6, a sixth resistor R6 is connected in parallel to two ends of the fifth resistor R5, a seventh resistor R7 is coupled to a connection node between the fifth resistor R5 and the sampling end of the first chip U1, the other end of the seventh resistor R7 is grounded, and a sixth capacitor C6 is connected in parallel to two ends of the seventh resistor R7.
By adopting the technical scheme, the voltage output by the feedback end of the transformer T1 is received by the sampling end of the first chip U1, and is divided by the fifth resistor R5 and the sixth resistor R6, so that the first chip U1 continuously obtains a constant output current.
Optionally, the first chip U1 further includes a sensing end, the sensing end of the first chip U1 is coupled to an eighth resistor R8, the other end of the eighth resistor R8 is coupled to the rectifying and filtering module, and two ends of the eighth resistor R8 are connected in parallel to a ninth resistor R9.
By adopting the above technical scheme, the detection end of the first chip U1 detects the current input to the first chip U1 through the eighth resistor R8 and the ninth resistor R9 which are coupled, and outputs the detection signal to the rectifying and filtering module through the output end of the first chip U1, so that the rectifying and filtering module adjusts the current output, and the current detection function is realized.
Optionally, the synchronous rectification module includes a second chip U2, an input end of the second chip U2 is coupled to an output end of the transformer T1, and an output end of the second chip U2 outputs a voltage of + 5V.
By adopting the technical scheme, the input end of the second chip U2 receives the transformation voltage output by the output end of the transformer T1, the second chip U2 is electrified to work, the output voltage output by the transformer T1 is reduced by the second chip U2, the conversion efficiency is improved, the +5V voltage is output, and the synchronous rectification function is realized.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the rectification loss of the output end of the whole switching power supply circuit is reduced by coupling the synchronous rectification module, so that the functions of improving the current output capability of the switching power supply circuit and improving the conversion efficiency are realized;
2. the detection end of the first chip U1 of the feedback control module detects the current input to the first chip U1 through the eighth resistor R8 and the ninth resistor R9 which are coupled, and outputs a detection signal to the rectifying and filtering module through the output end of the first chip U1, so that the rectifying and filtering module regulates the current output and has a current detection function;
3. through the control of the feedback control module on the rectifying and filtering module, when the output direct-current voltage is too high, the first chip U1 can perform overvoltage protection, so that the rectifying and filtering module reduces the output direct-current voltage; when the output direct-current voltage is too low, the first chip U1 realizes under-voltage protection, so that the rectifying and filtering module increases the output direct-current voltage, and the switching power supply circuit has a feedback control function.
Drawings
Fig. 1 is a block diagram of a switching power supply circuit based on synchronous rectification according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a switching power supply circuit based on synchronous rectification according to an embodiment of the present application.
Description of the reference numerals: 1. a rectification filtering module; 11. a rectification voltage-stabilizing sub-module; 12. a filtering submodule; 2. a feedback control module; 3. a voltage transformation module; 4. and a synchronous rectification module.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a switching power supply circuit based on synchronous rectification.
Referring to fig. 1 and 2, a switching power supply circuit based on synchronous rectification includes a rectification filter module 1, a feedback control module 2, a transformation module 3 and a synchronous rectification module 4, an input end of the rectification filter module 1 is coupled to an ac power supply, the transformation module 3 is coupled to the rectification filter module 1, the feedback control module 2 is coupled to the transformation module 3 to detect a voltage output to the transformation module 3 by the rectification filter module 1, the feedback control module 2 is further coupled to the rectification filter module 1 to output a feedback control signal, the synchronous rectification module 4 is coupled to a voltage output by the transformation module 3 to input the transformed voltage, and the synchronous rectification module 4 is used for outputting a +5V voltage.
The rectification and filtering module 1 comprises a rectification voltage-stabilizing submodule 11 and a filtering submodule 12, wherein the rectification voltage-stabilizing submodule 11 is coupled to an alternating-current power supply, and the filtering submodule 12 is coupled to the rectification voltage-stabilizing submodule 11. The rectifying and voltage-stabilizing sub-module 11 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, an anode of the first diode D1 is coupled to a cathode of the second diode D2, an anode of the second diode D2 is coupled to an anode of the third diode D3, a cathode of the third diode D3 is coupled to an anode of the fourth diode D4, a cathode of the fourth diode D4 is coupled to a cathode of the first diode D1, a first ac input terminal of the rectifying and voltage-stabilizing sub-module 11 is a connection node of the first diode D1 and the second diode D2, a second ac input terminal of the rectifying and voltage-stabilizing sub-module 11 is a connection node of the third diode D3 and the fourth diode D4, an anode output terminal of the rectifying and voltage-stabilizing sub-module 11 is a connection node of the second diode D2 and the third diode D3, a cathode output terminal of the rectifying and voltage-stabilizing sub-module 11 is a connection node of the first diode D1 and the fourth diode D4, the connection node of the first diode D1 and the second diode D2 is coupled to the live line terminal of the ac power source, the connection node of the third diode D3 and the fourth diode D4 is coupled to the neutral line terminal of the ac power source, the connection node of the second diode D2 and the third diode D3 is coupled to the filtering sub-module 12, and the connection node of the first diode D1 and the fourth diode D4 is used for providing the ground terminal.
The filtering submodule 12 includes a first capacitor C1, a first inductor L1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a zener diode D5, a fourth capacitor C4, and a second inductor L2. A first capacitor C1 is connected in series with the first inductor L1, a first inductor L1 is connected in series with a third capacitor C3, a third capacitor C3 is connected in series with a second inductor L2, a second inductor L2 is connected in series with a first capacitor C1, a connection node of the first capacitor C1 and the first inductor L1 is coupled to an anode output terminal of the rectifying and voltage-stabilizing submodule 11, a connection node of the second inductor L2 and the first capacitor C1 is coupled to a cathode output terminal of the rectifying and voltage-stabilizing submodule 11, a second capacitor C2 is connected in parallel with two ends of the third capacitor, a third resistor R3 is coupled to a connection node of the first capacitor C1 and the first inductor L1, the other end of the third resistor R3 is coupled to the second capacitor C2, a connection node of the third capacitor C3 and the first inductor L1 is coupled to the first resistor R1, the other end of the first resistor R1 is connected in series with the second resistor R1, the second resistor R1 is coupled in series with the voltage-stabilizing diode 6853, the fourth capacitor C4 is connected in parallel across the electrical meter resistor R1.
The transformation module 3 includes a transformer T1, the transformer T1 includes a primary side and a secondary side, the primary side of the transformer T1 includes a first connection terminal, a second connection terminal, a fourth connection terminal and a fifth connection terminal, the first connection terminal and the second connection terminal are feedback terminals of the transformer T1, the fourth connection terminal and the fifth connection terminal are input terminals of the transformer T1, the secondary side of the transformer T1 includes a sixth connection terminal and a seventh connection terminal, and the sixth connection terminal and the seventh connection terminal are output terminals of the transformer T1. The first connection end and the second connection end are coupled to the feedback control module 2, the fifth connection end is coupled to a connection node between the first resistor R1 and the fourth capacitor C4, the fourth connection end is coupled to a cathode of the zener diode D5, and the sixth connection end and the seventh connection end are coupled to the synchronous rectification module 4.
The feedback control module 2 comprises a first chip U1 with model number PN8386 JNEC-T1. The first chip U1 includes eight pins, a first pin of the first chip U1 is a ground terminal, a second pin of the first chip U1 is an input terminal, a third pin of the first chip U1 is a sampling terminal, a fourth pin of the first chip U1 is a detection terminal, and fifth to eighth pins of the first chip U1 are output terminals. The first pin of the first chip U1 is grounded, the second pin of the first chip U1 is coupled to the second connection end of the transformer T1, a zener diode D6 and a fourth resistor R4 are connected in series between the second pin and the second connection end of the first chip U1, and the first connection end of the transformer T1 is connected in series with a fifth capacitor C5 and then coupled to a connection node between the fourth resistor R4 and the second pin of the first chip U1. A third pin of the first chip U1 is coupled with a fifth resistor R5, the other end of the fifth resistor R5 is coupled with a connection node between the second connection end and the zener diode D6, two ends of the fifth resistor R5 are connected in parallel with a sixth resistor R6, a connection node between the fifth resistor R5 and the third pin of the first chip U1 is coupled with a seventh resistor R7, the other end of the seventh resistor R7 is coupled with a negative output end, and two ends of the seventh resistor R7 are connected in parallel with a sixth capacitor C6. The fourth pin of the first chip U1 is coupled to an eighth resistor R8, the other end of the eighth resistor R8 is coupled to the negative output terminal, and both ends of the eighth resistor R8 are further connected in parallel to a ninth resistor R9. The fifth pin to the eighth pin of the first chip U1 are coupled to the connection node of the zener diode D5 and the fourth connection terminal.
The synchronous rectification module 4 comprises a second chip U2 with the model number of PN8306H, the second chip U2 comprises eight pins, the fifth pin to the eighth pin of the second chip U2 are input terminals, the fourth pin of the second chip U2 is an output terminal, the first pin and the second pin of the second chip U2 are coupled and then grounded, the fifth pin to the eighth pin of the second chip U2 are coupled to the seventh connection terminal of the transformer T1, and the fourth pin of the second chip U2 is coupled to the sixth connection terminal of the transformer T1. A seventh capacitor C7 is coupled to a connection node of the first pin and the second pin of the second chip U2, the other end of the seventh capacitor C7 is connected in series with a tenth resistor R10, and the other end of the tenth resistor R10 is coupled to an input end of the second chip U2. The first pin of the second chip U2 is further coupled to an eighth capacitor C8, and the other end of the eighth capacitor is coupled to a fourth pin of the second chip U2. A connection node between a fourth pin of the second chip U2 and the sixth connection terminal outputs +5V voltage, two ends of the eighth capacitor C8 are connected in parallel to a ninth capacitor C9, two ends of the ninth capacitor C9 are connected in parallel to a tenth capacitor C10, two ends of the tenth capacitor C10 are connected in parallel to an eleventh resistor R11, a connection node between the eleventh resistor R11 and the tenth capacitor C10 is coupled to an eleventh capacitor C11, the other end of the eleventh capacitor C11 is coupled to the first connection terminal of the transformer T1, and a connection node between the eleventh capacitor C11 and the first connection terminal is coupled to the seventh resistor R7.
The implementation principle of the switching power supply circuit based on synchronous rectification in the embodiment of the application is as follows:
the first ac input end and the second ac input end of the rectifying and voltage-stabilizing submodule 11 are used for inputting ac voltage to the switching power supply circuit, the rectifying and voltage-stabilizing submodule 11 converts ac voltage into dc voltage, the dc voltage is output to the filter submodule 12 through the positive output end, the filter submodule 12 filters the dc voltage and outputs the dc voltage to the fifth connection end and the fourth connection end of the transformer T1, the first connection end and the second connection end of the transformer T1 output the dc voltage to the feedback control module 2, the feedback control module detects the dc voltage through the first chip U1 and outputs a feedback control signal to the rectifying and filtering module 1, when the dc voltage is too high, the feedback control module 2 outputs an overvoltage protection signal to make the rectifying and filtering module 1 reduce the output dc voltage, when the output dc voltage is too low, the feedback control module 2 outputs an undervoltage protection signal, the rectification filter module 1 improves the output direct-current voltage; the transformer T1 transforms the DC voltage, and outputs the DC voltage to the synchronous rectification module 4 through the sixth connection end and the seventh connection end, and the synchronous rectification module 4 reduces the rectification loss of the voltage output through the second chip U2, thereby improving the conversion efficiency and outputting +5V voltage.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A switching power supply circuit based on synchronous rectification, characterized by: including synchronous rectifier module (4), feedback control module (2), vary voltage module (3) and rectifier and filter module (1), alternating current mains voltage is coupled to rectifier and filter module (1), vary voltage module (3) are coupled in order to receive the high voltage in rectifier and filter module (1), feedback control module (2) are coupled in vary voltage module (3) in order to receive the voltage of rectifier and filter output, feedback control module (2) still are coupled in rectifier and filter module (1), coupling of vary voltage module (3) is in order to output voltage after the vary voltage to synchronous rectifier and filter module (4) in synchronous rectifier and filter module (4), synchronous rectifier and filter module (4) are used for exporting +5V direct current voltage.
2. A switching power supply circuit based on synchronous rectification according to claim 1, characterized in that: the rectification and filtering module (1) comprises a rectification voltage-stabilizing submodule (11) and a filtering submodule (12), the rectification voltage-stabilizing submodule (11) comprises a first alternating current input end, a second alternating current input end, a positive output end and a negative output end, the first alternating current input end is coupled to a live wire, the second alternating current input end is coupled to a zero wire, the positive output end is coupled to the filtering submodule (12) to output direct current voltage, and the negative output end is coupled to the filtering submodule (12) to provide a grounding end.
3. A synchronous rectification based switching power supply circuit as claimed in claim 2, wherein: the filter submodule (12) is coupled to the rectifying and voltage-stabilizing submodule (11), the filter submodule (12) includes a first capacitor C1, a first inductor L1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a voltage-stabilizing diode D5, a fourth capacitor C4, and a second inductor L2, the first capacitor C1 is connected in series to the first inductor L1, the other end of the first inductor L1 is coupled to the third capacitor C3, the other end of the third capacitor C3 is coupled to the second inductor L2, the other end of the second inductor L2 is coupled to the first capacitor C1, a connection node between the first capacitor C1 and the first inductor L1 is coupled to a positive output terminal of the rectifying and voltage-stabilizing submodule (11), a connection node between the second inductor L2 and the first capacitor C1 is coupled to a negative output terminal of the rectifying and the voltage-stabilizing submodule (11), and a connection node between the third capacitor C466 and the first inductor L1 is coupled to a negative output terminal of the rectifying and voltage-stabilizing submodule (11), the other end of the first resistor R1 is coupled to a second resistor R2, the other end of the second resistor R2 is coupled to a zener diode D5, the fourth capacitor C4 is connected in parallel to two ends of the first resistor R1, the second capacitor C2 is connected in parallel to two ends of the third capacitor C3, two ends of the first inductor L1 are further connected in parallel to a third resistor R3, a connection node between the fourth capacitor C4 and the first resistor R1 is coupled to the transformer module (3), and a cathode of the zener diode D5 is coupled to the transformer module (3).
4. A synchronous rectification based switching power supply circuit as claimed in claim 1, wherein: the transformation module (3) comprises a transformer T1, the transformer T1 comprises an input end, a feedback end and an output end, the input end of the transformer T1 is coupled to the rectification filter module (1), the feedback end of the transformer T1 is coupled to the feedback control module (2), and the output end of the transformer T1 is coupled to the synchronous rectification module (4).
5. The synchronous rectification-based switching power supply circuit according to claim 4, wherein: the feedback control module (2) includes a first chip U1, an input terminal of the first chip U1 is coupled to a feedback terminal of a transformer T1, a zener diode D6 and a fifth capacitor C5 are coupled between the input terminal of the first chip U1 and the feedback terminal of the transformer T1, a fourth resistor R4 is connected in series between the zener diode D6 and the input terminal of the first chip U1, the other end of the fourth resistor R4 is coupled to a fifth capacitor C5, and an output terminal of the first chip U1 is coupled to a cathode of the zener diode D5.
6. A synchronous rectification based switching power supply circuit as claimed in claim 5, wherein: the first chip U1 includes a sampling end, a fifth resistor R5 is coupled to the sampling end of the first chip U1, the other end of the fifth resistor R5 is coupled to a connection node between the feedback end of the transformer T1 and the zener diode D6, a sixth resistor R6 is connected in parallel to two ends of the fifth resistor R5, a seventh resistor R7 is coupled to a connection node between the fifth resistor R5 and the sampling end of the first chip U1, the other end of the seventh resistor R7 is grounded, and a sixth capacitor C6 is connected in parallel to two ends of the seventh resistor R7.
7. A synchronous rectification based switching power supply circuit as claimed in claim 5, wherein: the first chip U1 further includes a detection end, the detection end of the first chip U1 is coupled with an eighth resistor R8, the other end of the eighth resistor R8 is coupled to the rectifier filter module (1), and two ends of the eighth resistor R8 are connected in parallel with a ninth resistor R9.
8. The synchronous rectification-based switching power supply circuit according to claim 4, wherein: the synchronous rectification module (4) comprises a second chip U2, an input end of the second chip U2 is coupled to an output end of the transformer T1, and an output end of the second chip U2 outputs +5V voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123194556.3U CN216751521U (en) | 2021-12-17 | 2021-12-17 | Switching power supply circuit based on synchronous rectification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123194556.3U CN216751521U (en) | 2021-12-17 | 2021-12-17 | Switching power supply circuit based on synchronous rectification |
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| CN216751521U true CN216751521U (en) | 2022-06-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134593A (en) * | 2023-03-21 | 2023-11-28 | 荣耀终端有限公司 | Switching power supply, power adapter, charging system and charging method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134593A (en) * | 2023-03-21 | 2023-11-28 | 荣耀终端有限公司 | Switching power supply, power adapter, charging system and charging method |
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