Buck-controlled multipath isolation output power supply circuit

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By adopting the BUCK control chip solution, the multi-isolated output power supply circuit structure is simplified, the transformer PIN pin is reduced, the MOS tube and RCD absorption circuit are omitted, and the single-turn coil output is directly converted into multi-turn coil output is solved, solving the complexity and reliability problems of the traditional flyback solution, and achieving efficient and low-cost multi-isolated output.

CN223124786UActive Publication Date: 2025-07-18SHENZHEN TECHONE TECH

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Patent Information

Application Number: CN202521082570.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-05-29
Publication Date: 2025-07-18
Estimated Expiration: 2035-05-29

AI Technical Summary

Technical Problem

The traditional flyback solution has a complex multi-isolated output power supply circuit structure, the transformer occupies many PIN pins, has low reliability, low efficiency, high cost, and has a poor cross-adjustment rate between the channels.

Method used

The BUCK control chip solution is adopted to simplify the circuit structure, reduce the transformer PIN pin, and use BUCK chips and peripheral circuit components such as capacitors, resistors, diodes and inductor coils to adjust the output voltage by changing the voltage division values of R185 and R182, omitting the MOS tube and RCD absorption circuit, and directly converting the single-turn coil output into a multi-turn coil output.

Benefits of technology

It achieves high stability, strong reliability, high efficiency, low cost, good cross-adjustment rate between various channels and simple structure.

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Abstract

The utility model relates to a Buck-controlled multipath isolation output power supply circuit, comprising a BUCK chip and a peripheral circuit, a control chip adopts an integrated MOS BUCK chip, high frequency switch adjustment, voltage stabilization and output overload short circuit protection can be realized, a 12V output voltage value can be adjusted by changing partial voltage values of R185 and R182, and R198 and R200 are used for adjusting overcurrent protection. According to the utility model, the BUCK control chip scheme is adopted, the structure is simple, the number of PINs occupied by the transformer is small, the circuit is stable, the reliability is high, the efficiency is high, the cost is low, and the cross adjustment rate between the circuits is good.

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Description

Technical Field

[0001] The utility model is applied to the technical field of isolation circuits, and particularly relates to a multi-channel isolated output power supply circuit controlled by Buck. Background Art

[0002] In the field of power electronics, single-input multi-output situations are used in many application scenarios. Especially in the new energy industry, different voltage switching and isolated output of multiple outputs need to be realized in different charging and discharging scenarios.

[0003] Currently, the traditional flyback scheme is adopted, such as Figure 1 , but the flyback scheme has a complex circuit, many PINs occupied by the transformer, low reliability, low efficiency, high cost, and poor cross-regulation rate between channels.

[0004] Therefore, it is necessary to provide a multi-channel isolated output power supply circuit controlled by Buck, which can use a simple circuit structure and has higher reliability. Content of the Utility Model

[0005] In order to achieve the above object, the utility model provides a multi-channel isolated output power supply circuit controlled by Buck, including:

[0006] A BUCK chip, its VIN terminal is connected to the input positive voltage, its GND terminal is grounded, and capacitors C143 and C144 are connected in parallel between the VIN terminal and the GND terminal;

[0007] The EN terminal of the BUCK chip is connected to one end of a resistor R202, the other end of the resistor R202 is connected to the input positive voltage, and resistors R198 and R200 are connected in parallel between the IS terminal and the VS terminal of the BUCK chip; both ends of a capacitor C160 are respectively connected to the VS terminal and the VB terminal of the BUCK chip; one end of a resistor R185 is connected to 12V, the other end of the resistor R185 is connected to the FB terminal of the BUCK chip, and a capacitor C164 is connected in parallel with the resistor R185;

[0008] One end of a resistor R182 is connected to the FB terminal of the BUCK chip, and the other end of the resistor R182 is grounded; one end of a diode D106 is connected to the VS terminal of the BUCK chip, and the other end of the diode D106 is grounded;

[0009] One end of an inductor coil T1A is connected to the VS terminal of the BUCK chip, the other end of the inductor coil T1A is connected to 12V, and capacitors C152 and C155 are connected in parallel and both ends are respectively connected to the second terminal and the third terminal of U110; one end of a capacitor C149 is connected to 12V and connected to the first terminal of U110, and the other end of the capacitor C149 is grounded and connected to the second terminal of U110;

[0010] One end of the inductance coil T1C is connected to the second terminal of U110 and the first terminal of U112. The other end of the inductance coil T1C is connected to the negative electrode of the diode D110. The positive electrode of the diode D110 is connected to the second terminal of U112 and the VCC terminal. One end of the capacitor C158 is connected to the first terminal of U112, and the other end of the capacitor C158 is connected to the second terminal of U112. One end of the capacitor C159 is connected to the first terminal of U112, and the other end of the capacitor C159 is connected to the third terminal of U112 and the -5V.

[0011] One end of the inductance coil T1D is connected to the positive electrode of the diode D109. The negative electrode of the diode D109 is connected to one end of the resistor R184. The resistor R189 and the capacitor C162 are connected in parallel, and the first common terminal is connected to the other end of the resistor R184. The second common terminal of the resistor R189 and the capacitor C162 is connected to the other end of the inductance coil T1D.

[0012] One end of the inductance coil T1E is connected to the positive electrode of the diode D108. The negative electrode of the diode D108 is connected to one end of the resistor R176. The resistor R180 and the capacitor C153 are connected in parallel, and the first common terminal is connected to the other end of the resistor R176. The second common terminal of the resistor R180 and the capacitor C153 is connected to the other end of the inductance coil T1E.

[0013] One end of the inductance coil T1F is connected to the positive electrode of the diode D107. The negative electrode of the diode D107 is connected to one end of the resistor R187. The resistor R88 and the capacitor C148 are connected in parallel, and the first common terminal is connected to the other end of the resistor R187. The second common terminal of the resistor R88 and the capacitor C148 is connected to the other end of the inductance coil T1F.

[0014] In a possible implementation, the Vin input is 15V - 60V, and the output voltages include 12V, +5V, -5V, V1, V2, and V3.

[0015] In a possible implementation, the model of the BUCK chip is EG1192H.

[0016] In a possible implementation, the 12V output voltage value is adjusted by changing the voltage division value of R185 and R182, and R198 and R200 are used to adjust the overcurrent protection.

[0017] In a possible implementation, the capacitance value of the capacitor C143 is 224 μF, the capacitance value of the capacitor C144 is 224 μF, the resistance value of the resistor R202 is 470 KΩ, the resistance value of the resistor R198 is 47 Ω, the resistance value of the resistor R200 is 47 Ω, the resistance value of the resistor R185 is 10 KΩ, the resistance value of the resistor R182 is 1 KΩ, the capacitance value of the capacitor C160 is 104 μF, the capacitance value of the capacitor C160 is 104 μF, and the signal of the diode D106 is DSF1D.

[0018] In a possible implementation, the capacitance value of the capacitor C152 is 106 μF, the capacitance value of the capacitor C153 is 106 μF, the model of U110 is 78L05, the capacitance value of the capacitor C149 is 106 μF, the signal of the diode D110 is DSF1D, the capacitance value of the capacitor C158 is 106 μF, the model of U112 is 78L05, and the capacitance value of the capacitor C159 is 106 μF.

[0019] In a possible implementation, the model of the diode D109 is DSF1D, the resistance value of the resistor R184 is 100 Ω, the resistance value of the resistor R189 is 10 KΩ, and the capacitance value of the capacitor C162 is 106 μF.

[0020] In a possible implementation, the model of the diode D108 is DSF1D, the resistance value of the resistor R176 is 100 Ω, the resistance value of the resistor R180 is 10 KΩ, and the capacitance value of the capacitor C153 is 106 μF.

[0021] In a possible implementation, the model of the diode D107 is DSF1D, the resistance value of the resistor R187 is 100 Ω, the resistance value of the resistor R88 is 10 KΩ, and the capacitance value of the capacitor C148 is 106 μF.

[0022] The beneficial effects of the present utility model are as follows: The present utility model adopts a BUCK control chip solution, with a simple structure, fewer PIN pins occupied by the transformer, stable circuit, high reliability, high efficiency, low cost, and good cross-regulation rate among various circuits. Compared with the traditional circuit using a flyback solution, its circuit is complex, the transformer occupies more PIN pins, the reliability is low, the efficiency is low, the cost is high, and the cross-regulation rate among various circuits is poor. The present utility model can achieve the same effect, with one less MOS tube Q200, RCD absorption circuit D113, C201, and R201 than the traditional circuit, and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a circuit structure diagram of an embodiment of a traditional flyback isolation circuit provided by the prior art;

[0025] Figure 2 It is a circuit structure diagram of an embodiment of a Buck-controlled multi-channel isolated output power supply circuit provided by the present invention. Detailed implementation manners

[0026] The following will specifically describe the preferred embodiments of the present invention in conjunction with the drawings. Among them, the drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention.

[0027] As used herein, "embodiments" means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] Please refer to Figure 2 , the present invention provides a Buck-controlled multi-channel isolated output power supply circuit. The VIN terminal of the BUCK chip is connected to the input positive voltage, and its GND terminal is grounded. Capacitors C143 and C144 are connected in parallel between the VIN terminal and the GND terminal;

[0029] The EN terminal of the BUCK chip is connected to one end of resistor R202, the other end of resistor R202 is connected to the input positive voltage, and resistors R198 and R200 are connected in parallel between the IS terminal and the VS terminal of the BUCK chip; both ends of capacitor C160 are respectively connected to the VS terminal and the VB terminal of the BUCK chip; one end of resistor R185 is connected to 12V, and the other end of resistor R185 is connected to the FB terminal of the BUCK chip. Capacitor C164 is connected in parallel with the resistor R185;

[0030] One end of resistor R182 is connected to the FB terminal of the BUCK chip, and the other end of resistor R182 is grounded; one end of diode D106 is connected to the VS terminal of the BUCK chip, and the other end of diode D106 is grounded;

[0031] One end of the inductance coil T1A is connected to the VS terminal of the BUCK chip, and the other end of the inductance coil T1A is connected to 12V. Capacitors C152 and C155 are in parallel, and both ends are respectively connected to the second terminal and the third terminal of U110; one end of the capacitor C149 is connected to 12V and connected to the first terminal of U110, and the other end of the capacitor C149 is grounded and connected to the second terminal of U110;

[0032] One end of the inductance coil T1C is connected to the second terminal of U110 and connected to the first terminal of U112, and the other end of the inductance coil T1C is connected to the negative electrode of the diode D110. The positive electrode of the diode D110 is connected to the second terminal of U112 and connected to the VCC terminal; one end of the capacitor C158 is connected to the first terminal of U112, and the other end of the capacitor C158 is connected to the second terminal of U112. One end of the capacitor C159 is connected to the first terminal of U112, and the other end of the capacitor C159 is connected to the third terminal of U112 and connected to -5V;

[0033] One end of the inductance coil T1D is connected to the positive electrode of the diode D109, the negative electrode of the diode D109 is connected to one end of the resistor R184, the resistors R189 and C162 are in parallel, and the first common terminal is connected to the other end of the resistor R184. The second common terminal of the resistors R189 and C162 is connected to the other end of the inductance coil T1D;

[0034] One end of the inductance coil T1E is connected to the positive electrode of the diode D108, the negative electrode of the diode D108 is connected to one end of the resistor R176, the resistors R180 and C153 are in parallel, and the first common terminal is connected to the other end of the resistor R176. The second common terminal of the resistors R180 and C153 is connected to the other end of the inductance coil T1E;

[0035] One end of the inductance coil T1F is connected to the positive electrode of the diode D107, the negative electrode of the diode D107 is connected to one end of the resistor R187, the resistors R88 and C148 are in parallel, and the first common terminal is connected to the other end of the resistor R187. The second common terminal of the resistors R88 and C148 is connected to the other end of the inductance coil T1F.

[0036] Specifically, the Vin input is 15V - 60V, and the output voltages include 12V, +5V, -5V, V1, V2, and V3.

[0037] Specifically, the model of the BUCK chip is EG1192H.

[0038] Specifically, the output voltage value of 12V is adjusted by changing the voltage division value of R185 and R182, and R198 and R200 are used to adjust the overcurrent protection.

[0039] Specifically, the capacitance value of the capacitor C143 is 224 μF, the capacitance value of the capacitor C144 is 224 μF, the resistance value of the resistor R202 is 470 KΩ, the resistance value of the resistor R198 is 47 Ω, the resistance value of the resistor R200 is 47 Ω, the resistance value of the resistor R185 is 10 KΩ, the resistance value of the resistor R182 is 1 KΩ, the capacitance value of the capacitor C160 is 104 μF, the capacitance value of the capacitor C160 is 104 μF, and the signal of the diode D106 is DSF1D.

[0040] Specifically, the capacitance value of the capacitor C152 is 106 μF, the capacitance value of the capacitor C153 is 106 μF, the model of U110 is 78L05, the capacitance value of the capacitor C149 is 106 μF, the signal of the diode D110 is DSF1D, the capacitance value of the capacitor C158 is 106 μF, the model of U112 is 78L05, and the capacitance value of the capacitor C159 is 106 μF.

[0041] Specifically, the model of the diode D109 is DSF1D, the resistance value of the resistor R184 is 100 Ω, the resistance value of the resistor R189 is 10 KΩ, and the capacitance value of the capacitor C162 is 106 μF.

[0042] Specifically, the model of the diode D108 is DSF1D, the resistance value of the resistor R176 is 100 Ω, the resistance value of the resistor R180 is 10 KΩ, and the capacitance value of the capacitor C153 is 106 μF.

[0043] Specifically, the model of the diode D107 is DSF1D, the resistance value of the resistor R187 is 100 Ω, the resistance value of the resistor R88 is 10 KΩ, and the capacitance value of the capacitor C148 is 106 μF.

[0044] The beneficial effects of the present utility model are as follows: The present utility model adopts a BUCK control chip solution, which has a simple structure, few PINs occupied by the transformer, stable circuit, high reliability, high efficiency, low cost, and good cross-regulation rate among various circuits. Compared with the traditional circuit using a flyback solution, its circuit is complex, the transformer occupies many PINs, the reliability is low, the efficiency is low, the cost is high, and the cross-regulation rate among various circuits is poor. The present utility model can achieve the same effects, with one less MOS tube Q200, RCD absorption circuit D113, C201, and R201 than the traditional circuit, and has a simple structure. It should be noted that the MOS tube Q200 in the prior art is for realizing the on-off switching of the voltage conversion from a single-turn coil to a double-turn single-turn coil. After the MOS tube Q200 is removed in this application, the connection mode of the coil is changed (i.e., directly connected) at the same time. Therefore, the MOS tube Q200 is not needed, reducing the structural complexity. And the RCD absorption circuit D113, C201, and R201 are for absorbing the current during the on-off switching of the MOS tube Q200. Then, when the MOS tube Q200 is not needed, the RCD absorption circuit D113, C201, and R201 are not needed either. Thus, the simplification of the structure is achieved, and the same effects can also be realized.

[0045] Further, by improving the method of voltage conversion from a single-turn coil to a double-turn single-turn coil and then to a multi-turn coil voltage conversion in the prior art (such as Figure 1 ), to the method of directly outputting the single-turn coil and converting it to a multi-turn coil output voltage conversion in this application (such as Figure 2 ), the structure can be made simpler, and the magnitude of the output voltage can be quickly and reasonably adjusted according to the transformer turns ratio, thereby ensuring the cross-regulation rate among various circuits.

[0046] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A Buck-controlled multi-channel isolated output power supply circuit, characterized in that Comprising: A BUCK chip, its VIN terminal is connected to the input positive voltage, its GND terminal is grounded, and capacitor C143 and capacitor C144 are connected in parallel between the VIN terminal and the GND terminal; The EN terminal of the BUCK chip is connected to one end of resistor R202, the other end of resistor R202 is connected to the input positive voltage, and resistors R198 and R200 are connected in parallel between the IS terminal and the VS terminal of the BUCK chip; both ends of capacitor C160 are respectively connected to the VS terminal and the VB terminal of the BUCK chip; one end of resistor R185 is connected to 12V, the other end of resistor R185 is connected to the FB terminal of the BUCK chip, and capacitor C164 is connected in parallel with the resistor R185; One end of resistor R182 is connected to the FB terminal of the BUCK chip, and the other end of resistor R182 is grounded; one end of diode D106 is connected to the VS terminal of the BUCK chip, and the other end of diode D106 is grounded; One end of inductor coil T1A is connected to the VS terminal of the BUCK chip, the other end of inductor coil T1A is connected to 12V, and capacitors C152 and C155 are connected in parallel and both ends are respectively connected to the second terminal and the third terminal of U110; one end of capacitor C149 is connected to 12V and connected to the first terminal of U110, and the other end of capacitor C149 is grounded and connected to the second terminal of U110; One end of inductor coil T1C is connected to the second terminal of U110 and connected to the first terminal of U112, the other end of inductor coil T1C is connected to the negative electrode of diode D110, and the positive electrode of diode D110 is connected to the second terminal of U112 and connected to the VCC terminal; one end of capacitor C158 is connected to the first terminal of U112, the other end of capacitor C158 is connected to the second terminal of U112, one end of capacitor C159 is connected to the first terminal of U112, and the other end of capacitor C159 is connected to the third terminal of U112 and connected to -5V; One end of inductor coil T1D is connected to the positive electrode of diode D109, the negative electrode of diode D109 is connected to one end of resistor R184, resistors R189 and capacitor C162 are connected in parallel and the first common terminal is connected to the other end of resistor R184, and the second common terminal of resistors R189 and capacitor C162 is connected to the other end of inductor coil T1D; One end of inductor coil T1E is connected to the positive electrode of diode D108, the negative electrode of diode D108 is connected to one end of resistor R176, resistors R180 and capacitor C153 are connected in parallel and the first common terminal is connected to the other end of resistor R176, and the second common terminal of resistors R180 and capacitor C153 is connected to the other end of inductor coil T1E; One end of inductor coil T1F is connected to the positive electrode of diode D107, the negative electrode of diode D107 is connected to one end of resistor R187, resistors R88 and capacitor C148 are connected in parallel and the first common terminal is connected to the other end of resistor R187, and the second common terminal of resistors R88 and capacitor C148 is connected to the other end of inductor coil T1F.

2. The multi-channel isolated output power supply circuit with Buck control according to claim 1, characterized in that The Vin input is 15V - 60V, and the output voltages include 12V, +5V, -5V, V1, V2, and V3.

3. A Buck-controlled multi-channel isolated output power supply circuit according to claim 1, characterized in that, The model of the BUCK chip is EG1192H.

4. A Buck-controlled multi-channel isolated output power supply circuit according to claim 1, characterized in that, Adjust the 12V output voltage value by changing the voltage division values of R185 and R182. R198 and R200 are used to adjust overcurrent protection.

5. A Buck-controlled multi-channel isolated output power supply circuit according to claim 1, characterized in that, The capacitance value of the capacitor C143 is 224 μF, the capacitance value of the capacitor C144 is 224 μF, the resistance value of the resistor R202 is 470 KΩ, the resistance value of the resistor R198 is 47 Ω, the resistance value of the resistor R200 is 47 Ω, the resistance value of the resistor R185 is 10 KΩ, the resistance value of the resistor R182 is 1 KΩ, the capacitance value of the capacitor C160 is 104 μF, the capacitance value of the capacitor C160 is 104 μF, and the signal of the diode D106 is DSF1D.

6. The multi-channel isolated output power supply circuit with Buck control according to claim 1, characterized in that, The capacitance value of the capacitor C152 is 106 μF, the capacitance value of the capacitor C153 is 106 μF, the model of U110 is 78L05, the capacitance value of the capacitor C149 is 106 μF, the signal of the diode D110 is DSF1D, the capacitance value of the capacitor C158 is 106 μF, the model of U112 is 78L05, and the capacitance value of the capacitor C159 is 106 μF.

7. A Buck-controlled multi-channel isolated output power supply circuit according to claim 1, characterized in that The model of the diode D109 is DSF1D, the resistance value of the resistor R184 is 100 Ω, the resistance value of the resistor R189 is 10 KΩ, and the capacitance value of the capacitor C162 is 106 μF.

8. The multi-channel isolated output power supply circuit controlled by Buck according to claim 1, characterized in that The model of the diode D108 is DSF1D, the resistance value of the resistor R176 is 100 Ω, the resistance value of the resistor R180 is 10 KΩ, and the capacitance value of the capacitor C153 is 106 μF.

9. A Buck-controlled multi-channel isolated output power supply circuit according to claim 1, wherein The model of the diode D107 is DSF1D, the resistance value of the resistor R187 is 100 Ω, the resistance value of the resistor R88 is 10 KΩ, and the capacitance value of the capacitor C148 is 106 μF.