CN216981794U - Double-output circuit based on primary side feedback and single-secondary side winding - Google Patents
Double-output circuit based on primary side feedback and single-secondary side winding Download PDFInfo
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- CN216981794U CN216981794U CN202220053522.8U CN202220053522U CN216981794U CN 216981794 U CN216981794 U CN 216981794U CN 202220053522 U CN202220053522 U CN 202220053522U CN 216981794 U CN216981794 U CN 216981794U
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Abstract
The utility model provides a double-output circuit based on primary side feedback and a single secondary side winding, which comprises a transformer, a power and control circuit, a winding feedback circuit and a double-output voltage stabilizing circuit, wherein the power and control circuit is connected with the primary side of the transformer and is used for realizing the functions of main power conversion and control, the winding feedback circuit is connected with the primary side of the transformer and is used for carrying out primary sampling and realizing the feedback function, and the double-output voltage stabilizing circuit is connected with the secondary side of the transformer. The utility model provides a double-path output circuit based on a primary side feedback and a single secondary side winding, which adopts a primary side sampling feedback form and a single secondary side winding output to realize two paths of stable output; the influence of load change on the output voltage is greatly reduced, two-way output is realized only through a single transformer, the circuit structure is simplified, the manufacturing difficulty of the transformer is reduced, and further the manufacturing difficulty of related products is reduced.
Description
Technical Field
The utility model relates to the technical field of switching power supply circuits, in particular to a double-path output circuit based on primary side feedback and a single secondary side winding.
Background
Under the prior art, to the low-power isolation converter of dual output, there are two common circuit implementation forms: one is to determine one path as a main path and the other path as an auxiliary path, and perform feedback control on the main path by using an optical coupler or an isolation transformer on the auxiliary side to keep the main path stable, and the auxiliary path follows the output of the main path by using winding coupling to realize two-path output; the other is to sample the positive and negative outputs of the circuit at the same time, and to perform isolation feedback on the secondary side by using an optocoupler or an isolation transformer, so as to realize the stability of the two-way output.
Although the two circuits can realize double-path output, the following disadvantages exist: 1) because the output of the auxiliary circuit is not controlled, the output voltage of the auxiliary circuit can be greatly changed along with the change of the load; 2) the main circuit is isolated by an optical coupler or an isolation transformer, a reference source and an error amplifier are required to be arranged, the circuit structure is complex, and the circuit cost is improved; 3) each output voltage path needs one transformer pin, and in addition, one pin is used for a common point, so that the winding of the transformer is complicated, and the manufacturing difficulty of related products is increased.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a dual output circuit based on primary feedback and single secondary winding to solve the problems of the prior art.
In order to realize the purpose, the utility model adopts the following technical scheme:
a double-output circuit based on primary side feedback and a single secondary side winding comprises a transformer, a power and control circuit connected with the primary side of the transformer and used for achieving main power conversion and control functions, a winding feedback circuit connected with the primary side of the transformer and used for performing primary sampling and achieving a feedback function, and a double-output voltage stabilizing circuit connected with the secondary side of the transformer.
Further, the transformer includes a primary side TA1-TA2、TB1-TB2And secondary TC1-TC2In which TA1The terminal serves as a voltage input terminal.
Furthermore, the power and control circuit comprises a PWM controller and an MOS tube V1And a sampling resistor R1The PWM controller and the MOS tube V1Is connected with the grid of the MOS tube V1Drain electrode of (1) and TA2Terminal connection, source and resistor R1Is connected to one end of the resistor R1The other end of (2) and TB1The terminals are connected and grounded.
Further, the winding feedback circuit comprises a resistor R2、R3、R4Capacitor C1、C2、C3And a diode V2、V3Said TB2Terminals respectively connected with the diode V2Positive electrode and resistor R2Is connected to the other end of the diode V2Respectively with the capacitor C1Is connected to the PWM controller, the resistor R2The other end of the diode and the diode V are respectively connected with3Positive electrode and capacitor C2Is connected to one end of the diode V3Respectively with the resistance R3One terminal of and a capacitor C3Is connected to one end of the resistor R3The other end of each of the resistors R and R is connected with4Is connected to the PWM controller, the capacitor C1、C2、C3And a resistance R4The other end of the first and second connecting wires is connected and grounded.
Further, the two-way output voltage stabilizing circuit comprises a diode V4Capacitor C4Resistance R5And a voltage stabilizing tube V5、V6Said diode V4Positive electrode and TC2End connection, the capacitor C4One end of each of which is connected to a diode V4Negative electrode and resistor R5Is connected to the capacitor C4The other end of (a) is respectively connected with TC1And a voltage regulator tube V5The positive electrode of the voltage stabilizing tube V is connected with the positive electrode of the power supply5The positive pole of the voltage regulator tube is used as the output end of the negative circuit, and the voltage regulator tube V6Positive electrode and voltage regulator tube V5The negative pole of the voltage stabilizing tube V is connected and grounded, and the voltage stabilizing tube V6The negative electrode of the resistor is used as a positive circuit output end and connected with a resistor R5The other end of the connecting rod is connected.
According to the technical scheme, the utility model provides the double-path output circuit based on the primary side feedback and the single secondary side winding, and the two-path stable output is realized by adopting the primary side sampling feedback form and the single secondary side winding output; the influence of load change on the output voltage is greatly reduced, two-path output is realized only through a single transformer, the circuit structure is simplified, the manufacturing difficulty of the transformer is reduced, and the manufacturing difficulty of related products is further reduced.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The two-way output circuit based on the primary side feedback and the single secondary side winding in the preferred embodiment comprises a transformer, a power and control circuit which is connected with the primary side of the transformer and used for realizing the functions of main power conversion and control, a winding feedback circuit which is connected with the primary side of the transformer and used for carrying out primary sampling and realizing the feedback function, and a two-way output voltage stabilizing circuit which is connected with the secondary side of the transformer. Specifically, as shown in fig. 1:
the transformer comprises a primary side TA1-TA2、TB1-TB2And secondary TC1-TC2Wherein TA1The end is used as a voltage input end;
the power and control circuit comprises a PWM controller and an MOS tube V1And a sampling resistor R1The PWM controller and the MOS tube V1Is connected with the grid of the MOS tube V1Drain electrode of (1) and TA2Terminal connection, source and resistor R1Is connected to one end of the resistor R1The other end of (2) and TB1The end is connected and grounded;
the winding feedback circuit comprises a resistor R2、R3、R4Capacitor C1、C2、C3And a diode V2、V3Said TB2Terminals respectively connected with the diode V2Positive electrode and resistor R2Is connected to the other end of the diode V2Respectively with the capacitor C1Is connected to the PWM controller, the resistor R2The other end of the diode and the diode V are respectively connected with3Positive electrode and capacitor C2Is connected to one end of the diode V3Respectively with a resistor R3One terminal of and a capacitor C3Is connected to one end of the resistor R3The other end of each of the resistors R and R is connected with4Is connected to the PWM controller, the capacitor C1、C2、C3And a resistance R4The other end of the first and second connecting rods is connected and grounded; wherein the diode V2And a capacitor C1Form a rectifying and filtering circuit for passing through the winding TB1-TB2The output high-frequency pulse voltage is rectified to obtain a direct-current voltage to supply power for the PWM controller, and the resistor R2And a capacitor C2Form a low-pass filter for suppressing the diode V2Is generated by the positive pole of the diode V and the high-frequency pulse signal passes through the diode V3And a capacitor C3The formed rectifying and filtering circuit outputs a direct current voltage signal which passes through a resistor R3And R4The formed voltage division circuit outputs a feedback signal to the PWM controller.
The two-way output voltage stabilizing circuit comprises a diode V4Capacitor C4Resistance R5And a voltage regulator tube V5、V6Said diode V4Positive electrode and TC2End connection, the capacitor C4Respectively connected with a diode V4Negative electrode and resistor R5Is connected to the capacitor C4The other end of (a) is respectively connected with TC1And a voltage regulator tube V5Is connected with the positive pole of the voltage stabilizing tube V5The positive pole of the voltage regulator tube is used as the output end of the negative circuit, and the voltage regulator tube V6Anode and voltage-stabilizing tube V5The negative pole of the voltage stabilizing tube V is connected and grounded, and the voltage stabilizing tube V6The negative electrode of the resistor is used as a positive circuit output end and connected with a resistor R5The other end of the first and second connecting rods is connected; wherein the diode V4And a capacitor C4Form a rectifying and filtering circuit for passing through the winding TC1-TC2The output high-frequency pulse voltage is rectified to obtain a direct-current voltage.
Therefore, the utility model adopts a primary side sampling feedback form and single secondary side winding output to realize two-way stable output; the influence of load change on the output voltage is greatly reduced, an optical coupler or an isolation transformer in secondary side feedback is omitted compared with the prior art, two-way output is realized only through a single transformer, the circuit structure is simplified, the manufacturing difficulty of the transformer is reduced, and the manufacturing difficulty of related products is further reduced.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A double-output circuit based on primary side feedback and a single secondary side winding comprises a transformer and is characterized by further comprising a power and control circuit, a winding feedback circuit and a double-output voltage stabilizing circuit, wherein the power and control circuit is connected with the primary side of the transformer and used for achieving main power conversion and control functions, the winding feedback circuit is connected with the primary side of the transformer and used for performing primary sampling and achieving feedback functions, and the double-output voltage stabilizing circuit is connected with the secondary side of the transformer.
2. The dual output circuit based on the primary side feedback and the single secondary side winding of claim 1, wherein the transformer comprises a primary side TA1-TA2、TB1-TB2And secondary TC1-TC2Wherein TA1The terminal serves as a voltage input terminal.
3. The primary-side feedback and single-secondary-side winding based dual output circuit as claimed in claim 2, wherein the power and control circuit comprises a PWM controller, a MOS transistor V1And a sampling resistor R1The PWM controller and the MOS tube V1Is connected with the grid of the MOS tube V1Drain electrode of (1) and TA2Terminal connection, source and resistor R1Is connected to one end of the resistor R1The other end of (2) and TB1The terminals are connected and grounded.
4. The dual output circuit based on the primary feedback and the single secondary winding of claim 2, wherein the winding feedback circuit comprises a resistor R2、R3、R4Capacitor C1、C2、C3And a diode V2、V3Said TB2Terminals respectively connected with the diode V2Positive electrode and resistor R2Is connected to the other end of the diode V2Respectively with the capacitor C1Is connected to the PWM controller, the resistor R2The other end of the diode and the diode V are respectively connected with3Positive electrode and capacitor C2Is connected to one end of the diode V3Respectively with the resistance R3One terminal of and a capacitor C3Is connected to one end of the resistor R3The other end of each of the resistors R and R is connected with4Is connected to the PWM controller, the capacitor C1、C2、C3And a resistance R4The other end of the first and second connecting wires is connected and grounded.
5. The primary-side feedback and single secondary-side winding based dual-output circuit of claim 2, wherein the dual-output voltage stabilizing circuit comprises a diode V4Capacitor C4Resistance R5And a voltage regulator tube V5、V6Said diode V4Positive electrode and TC2End connection, the capacitor C4One end of each of which is connected to a diode V4Negative electrode and resistor R5Is connected to one end of said capacitor C4The other end of (a) is respectively connected with TC1And a voltage regulator tube V5Is connected with the positive pole of the voltage stabilizing tube V5The positive pole of the voltage regulator tube is used as the output end of the negative circuit, and the voltage regulator tube V6Anode and voltage-stabilizing tube V5The negative pole of the voltage stabilizing tube V is connected and grounded, and the voltage stabilizing tube V6The negative electrode of the resistor is used as a positive circuit output end and connected with a resistor R5The other end of the connecting rod is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220053522.8U CN216981794U (en) | 2022-01-10 | 2022-01-10 | Double-output circuit based on primary side feedback and single-secondary side winding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220053522.8U CN216981794U (en) | 2022-01-10 | 2022-01-10 | Double-output circuit based on primary side feedback and single-secondary side winding |
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| CN216981794U true CN216981794U (en) | 2022-07-15 |
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| CN202220053522.8U Active CN216981794U (en) | 2022-01-10 | 2022-01-10 | Double-output circuit based on primary side feedback and single-secondary side winding |
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| CN (1) | CN216981794U (en) |
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- 2022-01-10 CN CN202220053522.8U patent/CN216981794U/en active Active
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