CN210157087U - Direct current switch power supply circuit based on feedback regulation - Google Patents
Direct current switch power supply circuit based on feedback regulation Download PDFInfo
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- CN210157087U CN210157087U CN201920146157.3U CN201920146157U CN210157087U CN 210157087 U CN210157087 U CN 210157087U CN 201920146157 U CN201920146157 U CN 201920146157U CN 210157087 U CN210157087 U CN 210157087U
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Abstract
The utility model discloses a direct current switch power supply circuit based on feedback adjustment, including power E, drive chip U1, transformer T1, transformer T2, transformer T3 and transformer T4; the utility model discloses a mode that transformer T2's foot 1, transformer T3 and transformer T4's foot 1 of transformer T1, transformer T2 are connected to power E's positive pole is adjusted to the sole driver chip of whole circuit, not only can ensure output voltage's stability, can also reduce the cost of manufacture of circuit.
Description
Technical Field
The utility model relates to a power supply circuit specifically is a direct current switch power supply circuit based on feedback control.
Background
The integrated independent multi-output direct-current switching power supply has the advantages of high manufacturing cost, large volume of a high-frequency transformer, complex design, high process difficulty, poor batch producibility and low reliability, and can only be applied to occasions with low space requirements.
The discrete multi-output direct-current switching power supply has the advantages that each power supply needs an independent driving chip and a switching tube, so that the circuit structure of the scheme is complex, the cost is high, the efficiency is low, and the discrete multi-output direct-current switching power supply can only be applied to occasions with low cost requirements.
The design provides a switching power supply circuit which only adopts a single driving chip and utilizes multi-path signal feedback to realize automatic output regulation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current switch power supply circuit based on feedback control to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a direct current switch power supply circuit based on feedback regulation comprises a power supply E, a driving chip U1, a transformer T1, a transformer T2, a transformer T3 and a transformer T4; the anode of the power supply E is connected to pin 1 of transformer T1, pin 1 of transformer T2, pin 1 of transformer T3 and pin 1 of transformer T4, the cathode of power supply E is connected to the source of switching tube Q4, the gate of switching tube Q4 is connected to driving chip U4, pin 4 of transformer T4 is connected to the anode of diode D4, pin 3 of transformer T4 is connected to capacitor C4, pin 2 of transformer T4 is connected to pin 2 of transformer T4, pin 2 of transformer T4 and the drain of switching tube QT 4, the cathode of diode C4 is connected to the other terminal of diode D4, and the other terminal of diode 4 is connected to capacitor C4. The cathode of the diode D4 is connected with the other end of the capacitor C4, the cathode of the diode D1 is connected with the other end of the capacitor C1, the cathode of the diode D1 is connected with the cathode of the diode D2, the cathode of the diode D3, the cathode of the diode D4 and the resistor R3, the other end of the resistor R3 is connected with the resistor R4 and the driving chip U1, and a multi-path feedback signal loop is formed.
As a further technical solution of the present invention: the secondary winding Ns1 of the transformer T1 outputs Vo 1.
As a further technical solution of the present invention: the secondary winding Ns2 of the transformer T2 outputs Vo 2.
As a further technical solution of the present invention: the secondary winding Ns3 of the transformer T3 outputs Vo 3.
As a further technical solution of the present invention: the secondary winding Ns4 of the transformer T4 outputs Vo 4.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a mode of the common feedback regulation of multichannel transformer secondary winding is adjusted the only driver chip of whole circuit, not only can ensure output voltage's stability, can also reduce the cost of manufacture of circuit.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a circuit diagram of the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1: referring to fig. 1-2, a conventional dc switching power supply circuit based on feedback regulation is shown in fig. 2, each transformer is provided with an independent driving chip and a switching element, which is costly, and thus the design is shown in fig. 1, and includes a power supply E, a driving chip U1, a transformer T1, a transformer T2, a transformer T3 and a transformer T4; the anode of the power supply E is connected to pin 1 of transformer T1, pin 1 of transformer T1 and pin 1 of transformer T1, so that the power supply of power supply E is input to transformers T1-T1, the cathode of power supply E is connected to the source of switching tube Q1, the gate of switching tube Q1 is connected to driving chip U1, pin 4 of transformer T1 is connected to the anode of diode D1, pin 3 of transformer T1 is connected to capacitor C1, diodes D1-D1 are respectively used for rectifying the voltage output by transformers T1-T1, and the capacitor C1-C1 is used for filtering the voltage output by transformers T1-T1, pin 2 of the transformer T1 is connected to pin 2 of the transformer T2, pin 2 of the transformer T3, pin 2 of the transformer T4 and the drain of the switching tube QT1, the cathode of the diode D2 is connected to the other end of the capacitor C2, the cathode of the diode D3 is connected to the other end of the capacitor C3, the cathode of the diode D4 is connected to the other end of the capacitor C4, the cathode of the diode D1 is connected to the other end of the capacitor C1, the cathode of the diode D1 is connected to the cathode of the diode D2, the cathode of the diode D3, the cathode of the diode D4 and the resistor R3, and the other end of the resistor R3 is connected to the resistor R4 and the driving chip U1, thereby forming a multi-path feedback signal loop. Therefore, the secondary windings of the four-way transformer can feed back the driving chip U1, adjust the output duty ratio and further control the output voltage of other ways, so that the use amount of electronic elements can be effectively saved, and the cost is reduced.
Example 2, on the basis of example 1, assuming that the power input voltage is Vin, the multi-output dc power voltages are Vo1, Vo2, Vo3 and Vo 4; the primary and secondary windings of the transformers T1, T2, T3 and T4 are Np1/Ns1, Np2/Ns2, Np3/Ns3 and Np4/Ns4 respectively, the reflection voltage is Vor, the duty ratio of a power supply is D, and Vo1 is output main feedback voltage.
The basic principle of the circuit can be used as follows:
Vor=D*Vin/(1-D)；（1）；
the working principle of the transformer can be obtained as follows:
Vor/Np1=Vo1/Ns1；（2）；
Vor/Np2=Vo2/Ns2；（3）；
Vor/Np3=Vo3/Ns3；（4）；
Vor/Np4=Vo4/Ns4；（5）；
the following can be obtained by (2), (3), (4) and (5):
Vo2=Vo1*Ns2*Np1/Ns1*Np2
Vo3=Vo1*Ns3*Np1/Ns1*Np3
Vo4=Vo1*Ns4*Np1/Ns1*Np4
according to the principle, the turn ratio of the primary side and the secondary side of each transformer can be controlled to ensure each output voltage. The circuit is simple and reliable, and the suitability is strong.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A direct current switch power supply circuit based on feedback regulation comprises a power supply E, a driving chip U1, a transformer T1, a transformer T2, a transformer T3 and a transformer T4; the anode of the power supply E is connected to pin 1 of transformer T1, pin 1 of transformer T2, pin 1 of transformer T3 and pin 1 of transformer T4, the cathode of power supply E is connected to the source of switching tube Q4, the gate of switching tube Q4 is connected to driving chip U4, pin 4 of transformer T4 is connected to the anode of diode D4, pin 3 of transformer T4 is connected to capacitor C4, pin 2 of transformer T4 is connected to pin 2 of transformer T4, pin 2 of transformer T4 and the drain of switching tube QT 4, the cathode of diode C4 is connected to the other terminal of diode D4, and the other terminal of diode 4 is connected to capacitor C4. The cathode of the diode D4 is connected with the other end of the capacitor C4, the cathode of the diode D1 is connected with the other end of the capacitor C1, the cathode of the diode D1 is connected with the cathode of the diode D2, the cathode of the diode D3, the cathode of the diode D4 and the resistor R3, and the other end of the resistor R3 is connected with the resistor R4 and the driving chip U1 to form a multi-path feedback signal loop.
2. The direct-current switching power supply circuit based on the feedback regulation as claimed in claim 1, wherein the secondary winding Ns1 of the transformer T1 outputs Vo 1.
3. The direct-current switching power supply circuit based on the feedback regulation as claimed in claim 1, wherein the secondary winding Ns2 of the transformer T2 outputs Vo 2.
4. The direct-current switching power supply circuit based on the feedback regulation as claimed in claim 1, wherein the secondary winding Ns3 of the transformer T3 outputs Vo 3.
5. The direct-current switching power supply circuit based on the feedback regulation as claimed in claim 4, wherein the secondary winding Ns4 of the transformer T4 outputs Vo 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920146157.3U CN210157087U (en) | 2019-01-28 | 2019-01-28 | Direct current switch power supply circuit based on feedback regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920146157.3U CN210157087U (en) | 2019-01-28 | 2019-01-28 | Direct current switch power supply circuit based on feedback regulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210157087U true CN210157087U (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920146157.3U Active CN210157087U (en) | 2019-01-28 | 2019-01-28 | Direct current switch power supply circuit based on feedback regulation |
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| CN (1) | CN210157087U (en) |
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