CN216312959U - Auxiliary power supply circuit suitable for switching power supply - Google Patents
Auxiliary power supply circuit suitable for switching power supply Download PDFInfo
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- CN216312959U CN216312959U CN202122378826.XU CN202122378826U CN216312959U CN 216312959 U CN216312959 U CN 216312959U CN 202122378826 U CN202122378826 U CN 202122378826U CN 216312959 U CN216312959 U CN 216312959U
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Abstract
The utility model discloses an auxiliary source power supply circuit suitable for a switching power supply, which comprises an inductor L1, a resistor R1, a diode D1 and a capacitor C2, wherein the inductor L1 is used as an energy storage inductor of an external power supply circuit, a primary winding of an inductor L1 is connected with the power supply circuit, one end of a secondary winding of an inductor L1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with an anode of the capacitor C2 and is used as an output positive end of the auxiliary source circuit; the cathode of the capacitor C2 is connected to the other end of the secondary winding of the inductor L1 and serves as the output negative terminal of the auxiliary power supply circuit. The utility model effectively solves the problems of complex auxiliary source circuit, debugging and the like in the conventional power supply circuit, and provides energy for the circuit needing power supply in the power supply as the auxiliary source in the power supply.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to an auxiliary source power supply circuit suitable for a switching power supply.
Background
In the power supply circuit, an auxiliary source circuit is indispensable, and there is more than one auxiliary source circuit in some power supplies. According to the power supply requirement in the power supply, the requirements for the auxiliary source circuit are different, but the common auxiliary source circuit is based on a flyback conversion circuit, when the power supply requirement for the auxiliary source is not high, the circuit is relatively complex, the number of devices is large, and due to the fact that the auxiliary source circuit is an independent switching power supply circuit, the debugging also occupies a certain time.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an auxiliary power supply circuit for a switching power supply, which has a simple structure and high versatility.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an auxiliary power supply circuit suitable for a switching power supply comprises an inductor L1, a resistor R1, a diode D1 and a capacitor C2, wherein the inductor L1 is used as an energy storage inductor of an external power supply circuit, a primary winding of the inductor L1 is connected with the power supply circuit, one end of a secondary winding of the inductor L1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with an anode of the capacitor C2 and used as an output positive end of the auxiliary power supply circuit; the cathode of the capacitor C2 is connected to the other end of the secondary winding of the inductor L1 and serves as the output negative terminal of the auxiliary power supply circuit.
Due to the adoption of the technical scheme, the utility model has the following advantages:
the auxiliary source power supply circuit suitable for the switching power supply is simple in structure, few in devices, high in reliability and easy to achieve, effectively solves the problems that an auxiliary source circuit in a conventional power supply circuit is complex and needs to be debugged, serves as an auxiliary source in the power supply, provides energy for a circuit needing power supply in the power supply, is particularly suitable for being more provided with a certain self-speed regulation function when a fan in the power supply supplies power, and has wide application prospects in practical application of the switching power supply.
Drawings
Fig. 1 is a schematic diagram of an embodiment of an auxiliary power supply circuit for a switching power supply according to the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the auxiliary power supply circuit for a switching power supply includes an inductor L1, a resistor R1, a diode D1, and a capacitor C2, where the inductor L1 is used as an energy storage inductor of an external power supply circuit, a primary winding of the inductor L1 is connected to the power supply circuit, one end of a secondary winding of the inductor L1 is connected to an anode of the diode D1, a cathode of the diode D1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to an anode of the capacitor C2 and used as an output positive terminal V + of the auxiliary power supply circuit; the cathode of the capacitor C2 is connected to the other end of the secondary winding of the inductor L1 and serves as the output negative terminal V-of the auxiliary power supply circuit.
After the forward power supply circuit works, the inductor L1 is an energy storage inductor in the power supply circuit, wherein current flows through and voltage is converted, so that the electric field and the magnetic field in the inductor L1 are converted, voltage and current are induced by the secondary side of the inductor L1, and finally the required voltage and current can be obtained according to the Faraday's law of electromagnetic induction and the relationship between the current and the number of turns in the inductor; the voltage is an alternating voltage, and after rectification of the diode D1 and RC filtering of the resistor R1 and the capacitor C2, relatively stable auxiliary source output is generated. The resistor R1 also has a current limiting effect.
Because the inductor L1 is also equivalent to a transformer, the proportional relation between the primary current and the secondary current completely conforms to the Faraday's law of electromagnetic induction, the current obtained by the secondary is related to the output current of the forward power circuit, and when the load current of the external power circuit is small, the current of the auxiliary power supply circuit is also small; when the load current of the external power supply circuit is large, the current of the auxiliary power supply circuit is also large.
If the auxiliary power supply circuit supplies power to the fan of the power supply, the current condition enables the rotating speed of the fan to be automatically regulated according to the load condition of the external forward power supply circuit, and the effect is better.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. An auxiliary power supply circuit suitable for a switching power supply is characterized in that: the power supply circuit comprises an inductor L1, a resistor R1, a diode D1 and a capacitor C2, wherein the inductor L1 is used as an energy storage inductor of an external power supply circuit, a primary winding of the inductor L1 is connected with the power supply circuit, one end of a secondary winding of the inductor L1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with an anode of the capacitor C2 and is used as an output positive end of an auxiliary power supply circuit; the cathode of the capacitor C2 is connected to the other end of the secondary winding of the inductor L1 and serves as the output negative terminal of the auxiliary power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122378826.XU CN216312959U (en) | 2021-09-29 | 2021-09-29 | Auxiliary power supply circuit suitable for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122378826.XU CN216312959U (en) | 2021-09-29 | 2021-09-29 | Auxiliary power supply circuit suitable for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216312959U true CN216312959U (en) | 2022-04-15 |
Family
ID=81112869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122378826.XU Active CN216312959U (en) | 2021-09-29 | 2021-09-29 | Auxiliary power supply circuit suitable for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216312959U (en) |
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2021
- 2021-09-29 CN CN202122378826.XU patent/CN216312959U/en active Active
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