CN221042652U - High-performance synchronous rectification control circuit of switching power supply - Google Patents
High-performance synchronous rectification control circuit of switching power supply Download PDFInfo
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- CN221042652U CN221042652U CN202322591317.4U CN202322591317U CN221042652U CN 221042652 U CN221042652 U CN 221042652U CN 202322591317 U CN202322591317 U CN 202322591317U CN 221042652 U CN221042652 U CN 221042652U
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a high-performance synchronous rectification control circuit of a switching power supply, which comprises a synchronous rectification chip with positive and negative terminals applicable, wherein the synchronous rectification chip comprises a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively internally connected with synchronous rectification tube drains, the chip ground GND is respectively internally connected with synchronous rectification tube sources, the chip power supply pin VCC is connected with a bypass capacitor to the chip ground GND, and the chip cannot work under voltage under the constant-current and constant-voltage working conditions of a primary control system by using a special VCC power supply technology.
Description
Technical Field
The utility model relates to the technical field of synchronous rectification control chips, in particular to a high-performance synchronous rectification control circuit of a switching power supply.
Background
The switching power supply synchronous rectification control chip is suitable for various switching power supply control systems and supports various working modes of DCM, BCM, CCM and QR. However, the following problems cannot be avoided by the existing synchronous rectification control chip of the switching power supply: 1. the efficiency caused by the turn-off delay under the low CCM working condition cannot be greatly reduced without extremely fast turn-off speed; 2. the chip cannot be guaranteed not to work under electricity.
Disclosure of utility model
The utility model aims to solve the technical problems that the existing synchronous rectification control chip of the switching power supply has no extremely fast turn-off speed, the efficiency caused by turn-off delay under the low CCM working condition cannot be greatly reduced, and the chip cannot be ensured not to work under the power failure, and provides a high-performance synchronous rectification control circuit of the switching power supply.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
The synchronous rectification control circuit comprises a synchronous rectification chip with applicable positive and negative terminals, wherein the synchronous rectification chip comprises a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively connected with synchronous rectification tube drain electrodes in an inscribing mode, the chip ground GND is respectively connected with a synchronous rectification tube source electrode, and the chip power supply pin VCC is connected with a bypass capacitor to the chip ground GND.
Further, the chip high voltage power supply and the signal detection pin D are used for supplying power to the chip power supply pin VCC.
Further, the number of the high-voltage power supply and signal detection pins D of the chip is four, and the four high-voltage power supply and signal detection pins D of the chip are sequentially arranged on one side of the synchronous rectification chip in parallel.
Further, the number of the chip ground GNDs is three, and the three chip ground GNDs are sequentially arranged on the other side of the synchronous rectification chip in parallel.
Further, the bypass capacitor is in close proximity to the chip power pin VCC and the chip ground GND.
Compared with the prior art, the high-performance synchronous rectification control circuit of the switching power supply provided by the utility model comprises the synchronous rectification chip which can be applied to both positive and negative terminals, wherein the synchronous rectification chip comprises a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively connected with synchronous rectification tube drains, the chip ground GND is respectively connected with synchronous rectification tube sources, the chip power supply pin VCC is connected with bypass capacitors to the chip ground GND, thus, after the system is electrified, the output capacitors are charged through body diodes of built-in MOS tubes, the output voltages are increased, the power supply pin VCC of the synchronous rectification tube is charged through a chip internal power supply circuit, when the voltage of the power supply pin of the synchronous rectification tube is charged to an on threshold voltage, the chip internal control circuit is normally conducted and turned off, when the MOS tubes are normally conducted, currents are not passed through the body diodes, and the current is not required to be controlled to be in the low voltage level, the voltage is reduced under the normal state of the VCC, the voltage is still, the voltage is reduced under the normal state of the CCM, and the power supply voltage is not normally conducted under the constant voltage condition, and the power supply voltage is reduced under the normal state, and the power supply voltage is controlled under the normal state, and the normal state of the CCM is ensured, and the power supply voltage is stable, and the power is stable.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a high-performance synchronous rectification control circuit of a switching power supply according to the present embodiment.
Fig. 2 is another schematic diagram of a high-performance synchronous rectification control circuit of a switching power supply according to the present embodiment.
Fig. 3 is a packaging structure diagram of a synchronous rectification chip of the high-performance switching power supply synchronous rectification control circuit provided in this embodiment.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The implementation of the present utility model is described in detail below in connection with specific embodiments.
As shown in fig. 1 to 3, in the embodiment of the present utility model, a high-performance synchronous rectification control circuit for a switching power supply is provided, which includes a synchronous rectification chip with a positive terminal and a negative terminal applicable, the synchronous rectification chip includes a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively connected with a synchronous rectification drain, the chip ground GND is respectively connected with a synchronous rectification source, the chip power supply pin VCC is connected with a bypass capacitor C1 to the chip ground GND, so that after the system is powered on, the output voltage is increased by a body diode of a built-in MOS transistor, the output voltage is increased by the drain voltage detection pin D of a synchronous rectification driver, when the output voltage is increased, the power supply pin VCC is charged to an on threshold voltage, the chip internal control circuit starts to operate, the MOS transistor is normally turned on and off, when the current of the MOS transistor is not turned on, and the current is not flowing from the chip ground to the ground, the VCC is not passed through the chip ground, and the constant voltage is reduced by the chip ground voltage, and the constant voltage is still reduced by the constant voltage control circuit, and the constant voltage signal can be switched off at the same level as the constant voltage level, and the constant voltage signal can be controlled at the constant voltage level.
Further, the chip high voltage power supply and the signal detection pin D are used for supplying power to the chip power supply pin VCC.
Further, the number of the high-voltage power supply and signal detection pins D of the chip is four, and the four high-voltage power supply and signal detection pins D of the chip are sequentially arranged on one side of the synchronous rectification chip in parallel.
Further, the number of the chip ground GNDs is three, and the three chip ground GNDs are sequentially arranged on the other side of the synchronous rectification chip in parallel.
Further, the bypass capacitor is in close proximity to the chip power pin VCC and the chip ground GND.
In this embodiment, the copper-plated area of the chip high-voltage power supply and the signal detection pin D is appropriately larger to improve the heat dissipation of the chip.
In this embodiment, the power pin VCC of the chip is set to 6.3V to 6.4V.
Compared with the prior art, the high-performance synchronous rectification control circuit of the switching power supply provided by the utility model comprises a synchronous rectification chip with applicable positive and negative terminals, wherein the synchronous rectification chip comprises a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively internally connected with synchronous rectification tube drains, the chip ground GND is respectively internally connected with synchronous rectification tube sources, the chip power supply pin VCC is connected with bypass capacitors to the chip ground GND, thus, after the system is electrified, an output capacitor is charged through a body diode of a built-in MOS tube, the output voltage rises, the drain voltage detection pins D of the synchronous rectification driver are connected with an output voltage, when the output voltage rises, the power supply pin VCC of the synchronous rectifying tube is charged through the power supply circuit in the chip, when the voltage of the power supply pin VCC of the synchronous rectifying tube is charged to the starting threshold voltage, the internal control circuit of the chip starts to work, the MOS tube is normally conducted and disconnected, when the MOS tube is normally conducted, current does not flow through the body diode, and flows through the channel of the MOS tube, when the chip normally works, required working current still can supply power to the chip power supply pin VCC through the chip high-voltage power supply and the signal detection pin D, the special VCC power supply technology is used, the chip can not work under voltage under the constant current and constant voltage working states of the primary side control system, in addition, the chip has extremely fast turn-off speed, and efficiency loss caused by turn-off delay under CCM working conditions can be greatly reduced.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (5)
1. The high-performance synchronous rectification control circuit of the switching power supply is characterized by comprising synchronous rectification chips with positive and negative terminals applicable, wherein each synchronous rectification chip comprises a plurality of chip high-voltage power supply and signal detection pins D, a plurality of chip ground GND and a chip power supply pin VCC, the chip high-voltage power supply and the signal detection pins D are respectively connected with synchronous rectification tube drain electrodes in an inscription mode, the chip ground GND is respectively connected with synchronous rectification tube source electrodes in an inscription mode, and the chip power supply pin VCC is connected with bypass capacitors to the chip ground GND.
2. The high performance switching power supply synchronous rectification control circuit as claimed in claim 1, wherein said chip high voltage power supply and signal detection pin D is used to power said chip power supply pin VCC.
3. The high-performance synchronous rectification control circuit of claim 1, wherein said chip high voltage power supply and signal detection pins D are four, and said four chip high voltage power supply and signal detection pins D are arranged in parallel in sequence on one side of said synchronous rectification chip.
4. The high-performance synchronous rectification control circuit for switching power supply as claimed in claim 1, wherein said three chip ground GND are arranged in parallel on the other side of said synchronous rectification chip.
5. The high performance switching power supply synchronous rectification control circuit as claimed in claim 1, wherein said bypass capacitor is closely adjacent to said chip power supply pin VCC and said chip ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322591317.4U CN221042652U (en) | 2023-09-22 | 2023-09-22 | High-performance synchronous rectification control circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322591317.4U CN221042652U (en) | 2023-09-22 | 2023-09-22 | High-performance synchronous rectification control circuit of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221042652U true CN221042652U (en) | 2024-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322591317.4U Active CN221042652U (en) | 2023-09-22 | 2023-09-22 | High-performance synchronous rectification control circuit of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221042652U (en) |
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2023
- 2023-09-22 CN CN202322591317.4U patent/CN221042652U/en active Active
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