CN218940667U - Start power supply circuit and switching power supply - Google Patents
Start power supply circuit and switching power supply Download PDFInfo
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- CN218940667U CN218940667U CN202222884506.6U CN202222884506U CN218940667U CN 218940667 U CN218940667 U CN 218940667U CN 202222884506 U CN202222884506 U CN 202222884506U CN 218940667 U CN218940667 U CN 218940667U
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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
Abstract
The utility model provides a starting power supply circuit and a switching power supply, wherein the starting power supply circuit comprises an energy storage circuit, an auxiliary power supply circuit and a threshold value increasing circuit; the input end of the energy storage circuit is connected with the power supply circuit of the switching power supply, and the output end of the energy storage circuit is connected with the input end of the threshold increasing circuit and is used for supplying power to the threshold increasing circuit; the input end of the auxiliary power supply circuit is connected with the topological circuit of the switching power supply, and the output end of the auxiliary power supply circuit is connected with the energy storage circuit and is used for supplying power to the energy storage circuit; the output end of the threshold increasing circuit is connected with a power chip of the switching power supply and is used for increasing the starting threshold of the power chip and preventing the power chip from being in a starting state and a non-starting state all the time due to the fact that the starting threshold is too low. The utility model solves the hiccup problem of the low-voltage power supply chip and reduces the cost of the switching power supply.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a starting power supply circuit and a switching power supply.
Background
The starting voltage of the power chip of the low-voltage switching power supply is generally lower, so that the difference between the starting voltage and the stopping voltage of the power chip is smaller, the starting time of the power chip is shorter, and the hiccup phenomenon is easy to occur. At present, a common solution is to provide a separate power supply to supply power to the power supply chip, but this results in a high cost of the switching power supply.
Disclosure of Invention
The utility model provides a starting power supply circuit and a switching power supply, which can solve the hiccup problem of a low-voltage switching power supply under the condition that an independent power supply is not arranged, and reduce the cost of the switching power supply.
In a first aspect, the present utility model provides a start-up power supply circuit comprising a tank circuit, an auxiliary power supply circuit, and a threshold increasing circuit; the input end of the energy storage circuit is connected with the power supply circuit of the switching power supply, and the output end of the energy storage circuit is connected with the input end of the threshold increasing circuit and is used for supplying power to the threshold increasing circuit; the input end of the auxiliary power supply circuit is connected with the topological circuit of the switching power supply, and the output end of the auxiliary power supply circuit is connected with the energy storage circuit and is used for supplying power to the energy storage circuit; the output end of the threshold increasing circuit is connected with a power chip of the switching power supply and is used for increasing the starting threshold of the power chip and preventing the power chip from being in a starting state and a non-starting state all the time due to the fact that the starting threshold is too low.
Further, the threshold increasing circuit comprises a control chip, a first current limiting circuit, a second current limiting circuit, a filter circuit, a first switching tube and a second switching tube; the input end of the control chip is connected with the output end of the energy storage circuit, the output end of the control chip is connected with one end of the first current limiting circuit, the other end of the first current limiting circuit is connected with one end of the filter circuit and the base electrode of the first switch tube respectively, the collector electrode of the first switch tube is connected with the base electrode of the second switch tube through the second current limiting circuit, the base electrode of the second switch tube is connected with the second current limiting circuit, the emitter electrode of the second switch tube and the second current limiting circuit are also connected with the output end of the energy storage circuit, the collector electrode of the second switch tube is connected with the power chip, and the emitter electrode of the first switch tube and the other end of the filter circuit are grounded.
Further, the first current limiting circuit comprises a first resistor, one end of the first resistor is connected with the output end of the control chip, and the other end of the first resistor is connected with the filter circuit and the base electrode of the first switching tube respectively.
Further, the second current limiting circuit comprises a second resistor and a third resistor; one end of the second resistor is connected with the collector electrode of the first switching tube, the other end of the second resistor is connected with the base electrode of the second switching tube and one end of the third resistor respectively, and the other end of the third resistor is connected with the output end of the energy storage circuit.
Further, the filter circuit comprises a fourth resistor and a first capacitor; one end of the fourth resistor and one end of the first capacitor are connected with the first current limiting circuit, and the other end of the fourth resistor and the other end of the first capacitor are grounded.
Further, the energy storage circuit comprises a fifth resistor and a second capacitor, one end of the fifth resistor is connected with one end of the second capacitor, the other end of the fifth resistor is used for being connected with the power supply circuit, and the second capacitor is further connected with the auxiliary power supply circuit and the threshold increasing circuit respectively.
Further, the auxiliary power supply circuit comprises a rectifying circuit, a voltage stabilizing circuit, a third switching tube and a first diode; one end of the rectifying circuit is used for being connected with the topological circuit, the other end of the rectifying circuit and one end of the voltage stabilizing circuit are both connected with the collector electrode of the third switching tube, the base electrode of the third switching tube is connected with the voltage stabilizing circuit, the emitter electrode of the third switching tube is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with the energy storage circuit, and the other end of the voltage stabilizing circuit is grounded.
Further, the rectifying circuit comprises a second diode and a third capacitor; the positive pole of the second diode is used for being connected with the topological circuit, the negative pole of the second diode is respectively connected with one end of the third capacitor and the voltage stabilizing circuit, and the other end of the third capacitor is grounded.
Further, the voltage stabilizing circuit comprises a sixth resistor, a fourth capacitor and a third voltage stabilizing diode; one end of the sixth resistor is connected with the cathode of the second diode, the other end of the sixth resistor is connected with one end of the fourth capacitor and the cathode of the third zener diode respectively, the cathode of the third zener diode is also connected with the base electrode of the third switching tube, and the other end of the fourth capacitor and the anode of the third zener diode are grounded.
In a second aspect, the present utility model provides a switching power supply, which includes a power supply chip, a topology circuit, a power supply circuit, and the start-up power supply circuit according to any one of the above embodiments; the power supply circuit is connected with the energy storage circuit of the starting power supply circuit, the topology circuit is connected with the auxiliary power supply circuit of the starting power supply circuit, and the power supply chip is connected with the threshold increasing circuit of the starting power supply circuit.
According to the starting power supply circuit and the switching power supply disclosed by the utility model, when the voltage of the energy storage circuit reaches the starting voltage of the threshold increasing circuit, the threshold increasing starting voltage is conducted and supplies power to the power supply chip, so that the topology circuit is conducted, the topology circuit supplies power to the auxiliary power supply circuit, the auxiliary power supply circuit supplies power to the energy storage circuit, the stable operation of the power supply chip is ensured, and the starting voltage of the threshold increasing circuit is larger than the starting voltage of the power supply chip, so that the starting threshold of the power supply chip is increased, the hiccup phenomenon of the power supply chip during starting is avoided, and meanwhile, the cost of the switching power supply is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a start-up power circuit according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a start-up power supply circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In addition, directional terms such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc. as used herein refer only to the attached drawings and the direction of the product in use. Accordingly, directional terminology is used to describe and understand the utility model and is not limiting of the utility model. In addition, in the drawings, structures similar or identical to those of the drawings are denoted by the same reference numerals.
Referring to fig. 1, fig. 1 is a block schematic diagram of a start-up power supply circuit 100 according to an embodiment of the present utility model. As shown in fig. 1, the start-up power supply circuit 100 includes a tank circuit 20, an auxiliary power supply circuit 10, and a threshold increasing circuit 30; the input end of the energy storage circuit 20 is connected with the power supply circuit 200 of the switching power supply, and the output end of the energy storage circuit 20 is connected with the input end of the threshold value increasing circuit 30 and is used for supplying power to the threshold value increasing circuit 30; the input end of the auxiliary power supply circuit 10 is used for being connected with the topology circuit 400 of the switching power supply, and the output end of the auxiliary power supply circuit 10 is connected with the energy storage circuit 20 and is used for supplying power to the energy storage circuit 20; the output end of the threshold increasing circuit 30 is connected to the power chip 300 of the switching power supply, and is used for increasing the starting threshold of the power chip 300, so as to prevent the power chip 300 from being in a starting state and a non-starting state all the time due to the fact that the starting threshold is too low.
The hiccup phenomenon of the power chip 300 refers to that the power chip 300 is intermittently started and stopped because the difference between the start voltage and the stop voltage of the power chip 300 is too small. For example, if the start voltage of the power chip 300 is 9V and the stop voltage is 8V, when the voltage of the power chip 300 reaches 9V, the power chip 300 starts to operate, and when the start voltage of the power chip 300 reaches 8V, the power chip 300 stops operating, and the difference between 9V and 8V is small, so that the power chip 300 is very easy to switch between start and stop, and hiccup phenomenon occurs. In this application, when the switching power supply is powered, the power supply circuit 200 charges the energy storage circuit 20, so that the voltage of the energy storage circuit 20 rises, and when the voltage of the energy storage circuit 20 reaches the starting voltage of the threshold increasing circuit 30, the threshold increasing circuit 30 is turned on, and supplies power to the power chip 300, so that the power chip 300 is turned on. After the power chip 300 is turned on, the topology circuit 400 of the switching power supply is turned on and supplies power to the auxiliary power supply circuit 10, so that the auxiliary power supply circuit 10 is turned on, and the auxiliary power supply circuit 10 ensures that the voltage of the energy storage circuit 20 is always equal to the starting voltage of the threshold increasing circuit 30, so that the power chip 300 can stably operate. In the above process, when the switching power supply starts to supply power, the voltage of the tank circuit 20 is gradually increased, and the starting voltage of the threshold increasing circuit 30 is greater than the starting voltage of the power chip 300, so that the starting threshold of the power chip 300 is indirectly increased, for example, if the starting voltage of the power chip 300 is 9V and the stopping voltage is 8V, the starting voltage of the threshold increasing circuit 30 can be set to 16V and the stopping voltage is set to 8V, so that the starting voltage and the stopping voltage of the threshold increasing circuit 30 are far greater than the starting voltage and the stopping voltage of the power chip 300, and the difference between the starting voltage and the stopping voltage of the threshold increasing circuit 30 is generally greater, so that the power chip 300 is not reciprocally started when the threshold increasing circuit 30 supplies power to the power chip 300, thus avoiding the hiccup phenomenon.
As a further embodiment, the threshold increasing circuit 30 includes a control chip U1, a first current limiting circuit 31, a second current limiting circuit 33, a filter circuit 32, a first switching tube Q1, and a second switching tube Q2; the input end of the control chip U1 is connected with the output end of the energy storage circuit 20, the output end of the control chip U1 is connected with one end of the first current limiting circuit 31, the other end of the first current limiting circuit 31 is respectively connected with one end of the filter circuit 32 and the base of the first switch tube Q1, the collector of the first switch tube Q1 is connected with the base of the second switch tube Q2 through the second current limiting circuit 33, the base of the second switch tube Q2 is connected with the second current limiting circuit 33, the emitter of the second switch tube Q2 and the second current limiting circuit 33 are both connected with the output end of the energy storage circuit 20, the collector of the second switch tube Q2 is connected with the power chip 300, and the emitter of the first switch tube Q1 and the other end of the filter circuit 32 are both grounded.
As shown in fig. 2, the power supply pin of the control chip U1 is connected to the output end of the energy storage circuit 20, when the voltage of the energy storage circuit 20 reaches the start voltage of the control chip U1, the control chip U1 is started, for example, the start voltage of the control chip U1 may be 16V, the under-voltage lock is 10V, the stop voltage may be 8V, that is, the difference between the start voltage and the stop voltage of the control chip U1 is larger, and the difference between the start power supply and the under-voltage lock of the control chip U1 is also larger than the difference between the start voltage and the under-voltage lock of the power chip 300. When the voltage of the energy storage circuit 20 reaches 16V, the control chip U1 is started, and outputs the voltage to the first current limiting circuit 31 and the first switching tube Q1 through the output pin, so that the first switching tube Q1 is turned on, after the first switching tube Q1 is turned on, the base current of the second switching tube Q2 is turned on through the second current circuit, so that the second switching tube Q2 is turned on, and when the second switching tube Q2 is turned on, the energy storage circuit 20 supplies power to the power chip 300 through the second switching tube Q2, so that the power chip 300 is turned on. In addition, since the difference between the starting voltage and the under-voltage lock of the threshold increasing circuit 30 is much larger than the difference between the starting voltage and the under-voltage lock of the power chip 300, the power chip 300 can continuously operate for a long time when the switching power supply is started, so that the switching power supply can be ensured to be started normally. After the power chip 300 is started, the topology circuit 400 supplies power to the auxiliary power supply circuit 10, and the auxiliary power supply circuit 10 supplies power to the energy storage circuit 20, so that stable operation of the power chip 300 is ensured. In addition, the first switching transistor Q1 may be an NPN transistor, and the second switching transistor Q2 may be a PNP transistor.
As a further embodiment, the first current limiting circuit 31 includes a first resistor R1, one end of the first resistor R1 is connected to the output end of the control chip U1, and the other end of the first resistor R1 is connected to the filter circuit 32 and the base of the first switching tube Q1, respectively.
The first current limiting resistor is used for avoiding overlarge base current of the first switching tube Q1 and preventing the first switching tube Q1 from being burnt.
As a further embodiment, the second current limiting circuit 33 includes a second resistor R2 and a third resistor R3; one end of the second resistor R2 is connected to the collector of the first switching tube Q1, the other end of the second resistor R2 is connected to the base of the second switching tube Q2 and one end of the third resistor R3, and the other end of the third resistor R3 is connected to the output end of the tank circuit 20.
The second resistor R2 and the third resistor R3 are used as current limiting resistors, so that excessive currents of the collector of the first switching tube Q1 and the base of the second switching tube Q2 are avoided.
As a further embodiment, the filter circuit 32 includes a fourth resistor R4 and a first capacitor C1; one end of the fourth resistor R4 and one end of the first capacitor C1 are both connected to the first current limiting circuit 31, and the other end of the fourth resistor R4 and the other end of the first capacitor C1 are both grounded.
The fourth resistor R4 and the first capacitor C1 form a filter circuit 32, which is used for controlling the current output by the chip U1 to be filtered.
As a further embodiment, the tank circuit 20 includes a fifth resistor R5 and a second capacitor C2, one end of the fifth resistor R5 is connected to one end of the second capacitor C2, the other end of the fifth resistor R5 is connected to the power supply circuit 200, and the second capacitor C2 is further connected to the auxiliary power supply circuit 10 and the threshold value increasing circuit 30, respectively.
The power supply circuit 200 charges the second capacitor C2 through the fifth resistor R5, so that the voltage of the second capacitor C2 gradually rises, and when the voltage of the second capacitor C2 reaches the starting voltage of the threshold increasing circuit 30, the threshold increasing circuit 30 is turned on, the power chip 300 is turned on, and the topology circuit 400 is turned on. The auxiliary power supply circuit 10 is connected with the topology circuit 400, and when the topology circuit 400 is turned on, the auxiliary power supply circuit 10 supplies power to the energy storage circuit 20, maintains the starting voltage of the threshold increasing circuit 30, and ensures that the power chip 300 can stably operate.
As a further embodiment, the auxiliary power supply circuit 10 includes a rectifying circuit 11, a voltage stabilizing circuit 12, a third switching tube Q3, and a first diode D1; one end of the rectifying circuit 11 is connected to the topology circuit 400, the other end of the rectifying circuit 11 and one end of the voltage stabilizing circuit 12 are both connected to the collector of the third switching tube Q3, the base of the third switching tube Q3 is connected to the voltage stabilizing circuit 12, the emitter of the third switching tube Q3 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the energy storage circuit 20, and the other end of the voltage stabilizing circuit 12 is grounded.
Wherein the auxiliary power supply circuit 10 may be connected to the topology 400 through a pair of coupled windings TR, as shown in fig. 2. The rectifying circuit 11 is used for storing energy of the topology circuit 400, the voltage stabilizing circuit 12 is used for providing reference voltage for the base electrode of the third switching tube Q3, the third switching tube Q3 is used for linearly reducing voltage and adjusting voltage of the emitting electrode, and the first diode D1 is used for protecting the third switching tube Q3 and preventing the third switching tube Q3 from being broken down.
As a further embodiment, the rectifying circuit 11 includes a second diode D2 and a third capacitor C3; the positive electrode of the second diode D2 is connected to the topology circuit 400, the negative electrode of the second diode D2 is connected to one end of the third capacitor C3 and the voltage stabilizing circuit 12, and the other end of the third capacitor C3 is grounded.
The second diode D2 and the third capacitor C3 form a rectifying circuit 11 for storing energy of the topology circuit 400.
As a further embodiment, the voltage stabilizing circuit 12 includes a sixth resistor R6, a fourth capacitor C4, and a third zener diode D3; one end of the sixth resistor R6 is connected with the cathode of the second diode D2, the other end of the sixth resistor R6 is connected with one end of the fourth capacitor C4 and the cathode of the third zener diode D3, the cathode of the third zener diode D3 is also connected with the base of the third switching tube Q3, and the other end of the fourth capacitor C4 and the anode of the third zener diode D3 are grounded.
The sixth resistor R6, the fourth capacitor C4, and the third zener diode D3 form the voltage stabilizing circuit 12, the third zener diode D3 may be a voltage stabilizing tube, and the third switching tube Q3 adjusts the voltage of the emitter according to the voltage of the third zener diode D3.
The present utility model also provides a switching power supply, which includes a power supply chip 300, a topology circuit 400, a power supply circuit 200, and the start-up power supply circuit 100 according to any one of the above embodiments; the power supply circuit 200 is connected to the energy storage circuit 20 of the start-up power supply circuit 100, the topology circuit 400 is connected to the auxiliary power supply circuit 10 of the start-up power supply circuit 100, and the power supply chip 300 is connected to the threshold increasing circuit 30 of the start-up power supply circuit 100.
The starting power supply circuit and the switching power supply disclosed by the utility model can solve the hiccup phenomenon of the power supply chip and reduce the cost under the condition that the power supply chip is not required to be independently provided with the power supply.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A starting power supply circuit is applied to a switching power supply and is characterized by comprising a power storage circuit, an auxiliary power supply circuit and a threshold value increasing circuit;
the input end of the energy storage circuit is connected with the power supply circuit of the switching power supply, and the output end of the energy storage circuit is connected with the input end of the threshold increasing circuit and is used for supplying power to the threshold increasing circuit;
the input end of the auxiliary power supply circuit is connected with the topological circuit of the switching power supply, and the output end of the auxiliary power supply circuit is connected with the energy storage circuit and is used for supplying power to the energy storage circuit;
the output end of the threshold increasing circuit is connected with a power chip of the switching power supply and is used for increasing the starting threshold of the power chip and preventing the power chip from being in a starting state and a non-starting state all the time due to the fact that the starting threshold is too low.
2. The startup power supply circuit according to claim 1, wherein the threshold increasing circuit comprises a control chip, a first current limiting circuit, a second current limiting circuit, a filter circuit, a first switching tube, and a second switching tube;
the input end of the control chip is connected with the output end of the energy storage circuit, the output end of the control chip is connected with one end of the first current limiting circuit, the other end of the first current limiting circuit is connected with one end of the filter circuit and the base electrode of the first switch tube respectively, the collector electrode of the first switch tube is connected with the base electrode of the second switch tube through the second current limiting circuit, the base electrode of the second switch tube is connected with the second current limiting circuit, the emitter electrode of the second switch tube and the second current limiting circuit are also connected with the output end of the energy storage circuit, the collector electrode of the second switch tube is connected with the power chip, and the emitter electrode of the first switch tube and the other end of the filter circuit are grounded.
3. The start-up power supply circuit as set forth in claim 2, wherein the first current limiting circuit comprises a first resistor, one end of the first resistor is connected with the output end of the control chip, and the other end of the first resistor is connected with the filter circuit and the base electrode of the first switching tube respectively.
4. The start-up power supply circuit as set forth in claim 2, wherein said second current limiting circuit includes a second resistor and a third resistor;
one end of the second resistor is connected with the collector electrode of the first switching tube, the other end of the second resistor is connected with the base electrode of the second switching tube and one end of the third resistor respectively, and the other end of the third resistor is connected with the output end of the energy storage circuit.
5. The start-up power supply circuit as set forth in claim 2, wherein said filter circuit includes a fourth resistor and a first capacitor;
one end of the fourth resistor and one end of the first capacitor are connected with the first current limiting circuit, and the other end of the fourth resistor and the other end of the first capacitor are grounded.
6. The start-up power supply circuit as set forth in claim 1, wherein the tank circuit includes a fifth resistor and a second capacitor, one end of the fifth resistor being connected to one end of the second capacitor, the other end of the fifth resistor being connected to the power supply circuit, the second capacitor being further connected to the auxiliary power supply circuit and the threshold increasing circuit, respectively.
7. The start-up power supply circuit as set forth in claim 1, wherein the auxiliary power supply circuit includes a rectifier circuit, a voltage regulator circuit, a third switching tube, and a first diode;
one end of the rectifying circuit is used for being connected with the topological circuit, the other end of the rectifying circuit and one end of the voltage stabilizing circuit are both connected with the collector electrode of the third switching tube, the base electrode of the third switching tube is connected with the voltage stabilizing circuit, the emitter electrode of the third switching tube is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with the energy storage circuit, and the other end of the voltage stabilizing circuit is grounded.
8. The start-up power supply circuit as set forth in claim 7, wherein said rectifying circuit includes a second diode and a third capacitor;
the positive pole of the second diode is used for being connected with the topological circuit, the negative pole of the second diode is respectively connected with one end of the third capacitor and the voltage stabilizing circuit, and the other end of the third capacitor is grounded.
9. The start-up power supply circuit as set forth in claim 8, wherein the voltage regulator circuit includes a sixth resistor, a fourth capacitor, and a third zener diode;
one end of the sixth resistor is connected with the cathode of the second diode, the other end of the sixth resistor is connected with one end of the fourth capacitor and the cathode of the third zener diode respectively, the cathode of the third zener diode is also connected with the base electrode of the third switching tube, and the other end of the fourth capacitor and the anode of the third zener diode are grounded.
10. A switching power supply comprising a power supply chip, a topology circuit, a power supply circuit, and a start-up power supply circuit according to any one of claims 1 to 9;
the power supply circuit is connected with the energy storage circuit of the starting power supply circuit, the topology circuit is connected with the auxiliary power supply circuit of the starting power supply circuit, and the power supply chip is connected with the threshold increasing circuit of the starting power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222884506.6U CN218940667U (en) | 2022-10-31 | 2022-10-31 | Start power supply circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222884506.6U CN218940667U (en) | 2022-10-31 | 2022-10-31 | Start power supply circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218940667U true CN218940667U (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222884506.6U Active CN218940667U (en) | 2022-10-31 | 2022-10-31 | Start power supply circuit and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218940667U (en) |
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2022
- 2022-10-31 CN CN202222884506.6U patent/CN218940667U/en active Active
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