Flyback isolated high-voltage input DC-DC power supply module

Abstract

The utility model relates to a DC-DC power supply module, in particular to a flyback isolated high-voltage input DC-DC power supply module. Comprising a module input end, an input filter circuit, a power switch circuit, a rectification circuit, an output filter circuit and a module output end which are connected in sequence. An absorption circuit is arranged between the input filter circuit and the power switch circuit; and a feedback circuit and a control circuit are arranged between the power switch circuit and the module output end. According to the utility model, the wide-range input voltage of DC90V-360V can be realized under the condition of no optocoupler feedback, and the default output voltage is 12V, so that the power supply can be used under the condition that isolation is needed and the input voltage is high, and the cost performance of the power supply can be improved.

Description

Technical Field

[0001] This utility model relates to DC-DC power modules, specifically to a flyback isolated high-voltage input DC-DC power module. Background Technology

[0002] Power modules, as voltage conversion devices, can convert input voltage into the required output voltage. They are widely used in the field of communication (such as switching equipment, access equipment, mobile communication, microwave communication, optical transmission, etc.) as well as in automotive electronics, aerospace and other fields.

[0003] Power supplies play a crucial role in systems, often referred to as the "heart" of the system. They provide a continuous and stable supply of energy to the system circuits and help the system resist external interference. In industrial applications, to reduce the impact of harsh electromagnetic environments on the system, it is necessary to isolate the external interface circuits from the internal control circuits, which requires power supplies to have isolation capabilities. However, traditional isolated DC-DC power supplies have shortcomings such as low input voltage, narrow input range, and limited application scope. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of low input voltage and narrow input range of existing isolated DC-DC power supplies, and to provide a flyback isolated high-voltage input DC-DC power supply module.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A flyback isolated high-voltage input DC-DC power module includes a module input terminal, an input filter circuit, a power switch circuit, a rectifier circuit, an output filter circuit, and a module output terminal connected in sequence.

[0007] An absorption circuit is provided between the input filter circuit and the power switch circuit;

[0008] A feedback circuit and a control circuit are provided between the power switch circuit and the module output terminal.

[0009] Furthermore, the module input terminal includes input terminals TP1 and TP3, with input terminal TP3 grounded;

[0010] The module output includes output terminals TP2 and TP4, with output terminal TP4 grounded.

[0011] Furthermore, the power switching circuit includes a transformer T1;

[0012] The transformer T1 includes a primary winding PRI, a secondary winding SEC, and an auxiliary winding AUX;

[0013] The first and third pins of the primary winding PRI are connected, and the second and fourth pins of the primary winding PRI are connected.

[0014] The eighth, tenth and twelfth pins of the secondary winding SEC are connected, and the seventh, ninth and eleventh pins of the secondary winding SEC are connected.

[0015] The fifth pin of the auxiliary winding AUX is connected to the control circuit and the feedback circuit, and the sixth pin of the auxiliary winding AUX is grounded.

[0016] Furthermore, the feedback circuit includes feedback adjustment resistors R11, R12, and R13;

[0017] The two ends of the feedback adjustment resistor R11 are connected to the fifth pin of the auxiliary winding AUX and the control circuit, respectively; one end of the feedback adjustment resistors R12 and R13 is connected to the control circuit, and the other end is grounded.

[0018] Furthermore, the control circuit includes an integrated chip U2;

[0019] The first pin of the integrated chip U2 is grounded;

[0020] The second pin of integrated chip U2 is connected to the cathode of rectifier diode D2 and the cathode of Zener diode D4.

[0021] The anode of rectifier diode D2 is connected to the fifth pin of auxiliary winding AUX through resistors R9 and R10. A series resistor R8 and capacitor C9 are connected across the two ends of rectifier diode D2.

[0022] The anode of the Zener diode D4 is grounded;

[0023] A resistor R5 is connected in series between the second pin of integrated chip U2 and the input terminal TP1. The second pin of integrated chip U2 is grounded through capacitors C10 and C11.

[0024] The third pin of the integrated chip U2 is connected to the fifth pin of the auxiliary winding AUX through resistor R11, and is grounded through resistors R12 and R13 and capacitor C12;

[0025] The fourth and fifth pins of the integrated chip U2 are connected together and grounded through resistors R14 and R15;

[0026] The sixth, seventh, and eighth pins of the integrated chip U2 are connected together, and are connected to the second and fourth pins of the primary winding PRI through an absorption circuit;

[0027] The sixth, seventh, and eighth pins of the integrated chip U2 are grounded through capacitor C13.

[0028] Furthermore, the input filter circuit includes capacitors C5, C6, and C7;

[0029] One end of capacitors C5, C6 and C7 is grounded, and the other end is connected to input terminal TP1, the second pin and the fourth pin of the primary winding PRI;

[0030] The output filter circuit includes capacitors C3 and C4;

[0031] One end of capacitors C3 and C4 is grounded, and the other end outputs to terminal TP2 and the rectifier circuit.

[0032] Furthermore, the absorption circuit includes resistors R3, R4, R6, and R7, capacitor C8, and diode D3;

[0033] One end of resistors R3 and R4 and capacitor C8 is connected to the second and fourth pins of the primary winding PRI, and the other end is connected to one end of resistors R6 and R7;

[0034] The other ends of resistors R6 and R7 are connected to the cathode of diode D3. The anode of diode D3 is connected to the second and fourth pins of the primary winding PRI and the sixth, seventh, and eighth pins of integrated chip U2.

[0035] Furthermore, the rectifier circuit includes a first rectifier circuit and a second rectifier circuit;

[0036] The first rectifier circuit includes a rectifier diode D1, the anode of which is connected to the eighth, tenth and twelfth pins of the secondary winding SEC, and the cathode of which is connected to one end of capacitors C3 and C4.

[0037] The second rectifier circuit includes a synchronous rectifier chip U1, resistors R1 and R2, and capacitors C1 and C2;

[0038] The third and fourth pins of the synchronous rectifier chip U1 are connected, and the eighth, tenth, and twelfth pins of the secondary winding SEC are also connected.

[0039] The fifth and sixth pins of the synchronous rectifier chip U1 are connected together and also connected to one end of capacitors C3 and C4;

[0040] The first pin of the synchronous rectifier chip U1 is connected to the third and fourth pins through capacitor C2, and the seventh pin is connected to the fifth and sixth pins through resistor R2.

[0041] A resistor R1 and a capacitor C1 are connected in series between the fourth and sixth pins of the synchronous rectifier chip U1.

[0042] Furthermore, the transformer T1 is a compact surface-mount high-frequency transformer.

[0043] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0044] 1. The flyback isolated high-voltage input DC-DC power module provided by this utility model, by setting up a power switching circuit, a control circuit, an absorption circuit and a feedback circuit, can achieve a wide range of input voltage of DC90V-360V without optocoupler feedback, and the default output voltage is 12V. It can meet the needs of power supply use when isolation is required and the input voltage is high, and helps to improve the cost performance of the power supply.

[0045] 2. The flyback isolated high-voltage input DC-DC power module provided by this utility model, through the reasonable connection of electronic components such as synchronous rectifier chip U1, integrated chip U2, transformer T1, resistors, and capacitors, helps to reduce the space occupied by the DC-DC power module and minimize the size of the DC-DC power module. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0047] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the present utility model. Detailed Implementation

[0048] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0049] like Figure 1 As shown, a flyback isolated high-voltage input DC-DC power module includes a module input terminal, an input filter circuit, a power switch circuit, a rectifier circuit, an output filter circuit, and a module output terminal connected in sequence; an absorption circuit is provided between the input filter circuit and the power switch circuit; a feedback circuit and a control circuit are provided between the power switch circuit and the module output terminal.

[0050] The input voltage range of the module input terminal is DC90V-360V, and the output voltage of the module output terminal is 12V by default.

[0051] like Figure 2As shown, the above-mentioned flyback isolated high-voltage input DC-DC power module adopts a classic DC-DC flyback topology; including synchronous rectifier chip U1, integrated chip U2, transformer T1, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, feedback adjustment resistors R11, R12, R13, resistors R14, R15, capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, rectifier diodes D1, D2, diode D3, and Zener diode D4.

[0052] like Figure 2 As shown, the module input terminals include input terminals TP1 and TP3, with input terminal TP3 grounded; the module output terminals include output terminals TP2 and TP4, with output terminal TP4 grounded.

[0053] like Figure 2 As shown, the power switching circuit includes a transformer T1, which is a compact surface-mount high-frequency transformer; the transformer T1 includes a primary winding PRI, a secondary winding SEC, and an auxiliary winding AUX;

[0054] The primary winding PRI is used to increase the current, the secondary winding SEC is used to power the subsequent circuits, and the auxiliary winding AUX is used to power the control circuit and feedback circuit.

[0055] The first and third pins of the primary winding PRI are connected, and the second and fourth pins of the primary winding PRI are connected.

[0056] The eighth, tenth and twelfth pins of the secondary winding SEC are connected together, and the seventh, ninth and eleventh pins of the secondary winding SEC are connected together.

[0057] The fifth pin of the auxiliary winding AUX is connected to the control circuit and the feedback circuit, and the sixth pin of the auxiliary winding AUX is grounded.

[0058] like Figure 2 As shown, the feedback circuit includes feedback adjustment resistors R11, R12 and R13; the feedback adjustment resistors R11, R12 and R13 work together with the integrated chip U2 to realize the output feedback control of the module output terminal. Compared with traditional power supplies, it has low delay, fast response speed, and does not require the use of optocouplers to realize the feedback control of output voltage or current.

[0059] The two ends of the feedback adjustment resistor R11 are connected to the fifth pin of the auxiliary winding AUX and the control circuit, respectively; one end of the feedback adjustment resistors R12 and R13 is connected to the control circuit, and the other end is grounded.

[0060] like Figure 2As shown, the control circuit includes an integrated chip U2; the model of the integrated chip U2 is LP3799EEM.

[0061] The first pin of the integrated chip U2 is grounded;

[0062] The second pin of integrated chip U2 is connected to the cathode of rectifier diode D2 and the cathode of Zener diode D4.

[0063] The anode of rectifier diode D2 is connected to the fifth pin of auxiliary winding AUX through resistors R9 and R10. A series resistor R8 and capacitor C9 are connected across the two ends of rectifier diode D2.

[0064] The anode of the Zener diode D4 is grounded;

[0065] A resistor R5 is connected in series between the second pin of integrated chip U2 and the input terminal TP1. The second pin of integrated chip U2 is grounded through capacitors C10 and C11.

[0066] The third pin of the integrated chip U2 is connected to the fifth pin of the auxiliary winding AUX through resistor R11, and is grounded through resistors R12 and R13 and capacitor C12;

[0067] The fourth and fifth pins of the integrated chip U2 are connected together and grounded through resistors R14 and R15;

[0068] The sixth, seventh, and eighth pins of the integrated chip U2 are connected together, and are connected to the second and fourth pins of the primary winding PRI through an absorption circuit;

[0069] The sixth, seventh, and eighth pins of the integrated chip U2 are grounded through capacitor C13.

[0070] like Figure 2 As shown, the input filter circuit includes capacitors C5, C6, and C7; one end of capacitors C5, C6, and C7 is grounded, and the other end is connected to the input terminal TP1, the second pin of the primary winding PRI, and the fourth pin; capacitors C5, C6, and C7 in the input filter circuit are used to filter out the ripple in the voltage input to the module input terminal and provide a smooth voltage for other circuit parts.

[0071] The output filter circuit includes capacitors C3 and C4; one end of capacitors C3 and C4 is grounded, and the other end is connected to the output terminal TP2 and the rectifier circuit. Capacitors C3 and C4 in the output filter circuit are used to filter out the ripple in the output voltage of the rectifier circuit.

[0072] like Figure 2As shown, in order to absorb the peak voltage generated by the primary winding PRI of transformer T1, the absorption circuit includes resistors R3, R4, R6, and R7, capacitor C8, and diode D3; one end of resistors R3, R4, and capacitor C8 is connected to the second and fourth pins of the primary winding PRI, and the other end is connected to one end of resistors R6 and R7; the other end of resistors R6 and R7 is connected to the cathode of diode D3, and the anode of diode D3 is connected to the second and fourth pins of the primary winding PRI and the sixth, seventh, and eighth pins of integrated chip U2.

[0073] like Figure 2 As shown, the rectifier circuit includes a first rectifier circuit and a second rectifier circuit; either the first rectifier circuit or the second rectifier circuit can be used.

[0074] The first rectifier circuit includes a rectifier diode D1. The anode of the rectifier diode D1 is connected to the eighth, tenth and twelfth pins of the secondary winding SEC, and the cathode of the rectifier diode D1 is connected to one end of capacitors C3 and C4.

[0075] The second rectifier circuit includes a synchronous rectifier chip U1, resistors R1 and R2, and capacitors C1 and C2; the synchronous rectifier chip U1 is model LP15R060S.

[0076] The third and fourth pins of the synchronous rectifier chip U1 are connected, and the eighth, tenth, and twelfth pins of the secondary winding SEC are also connected.

[0077] The fifth and sixth pins of the synchronous rectifier chip U1 are connected together and also connected to one end of capacitors C3 and C4;

[0078] The first pin of the synchronous rectifier chip U1 is connected to the third and fourth pins through capacitor C2, and the seventh pin is connected to the fifth and sixth pins through resistor R2.

[0079] A resistor R1 and a capacitor C1 are connected in series between the fourth and sixth pins of the synchronous rectifier chip U1.

[0080] The flyback isolated high-voltage input DC-DC power module provided by this utility model is an isolated wide-range input DC power module with an input voltage range of DC90V-360V and a default output voltage of 12V; it can meet the needs of power supply use when isolation is required and the input voltage is high.

[0081] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A flyback isolated high-voltage input DC-DC power supply module, characterized in that: It includes the module input terminal, input filter circuit, power switch circuit, rectifier circuit, output filter circuit and module output terminal connected in sequence; An absorption circuit is provided between the input filter circuit and the power switch circuit; A feedback circuit and a control circuit are provided between the power switch circuit and the module output terminal.

2. The flyback isolated high-voltage input DC-DC power supply module according to claim 1, characterized in that: The module input terminals include input terminals TP1 and TP3, with input terminal TP3 grounded. The module output includes output terminals TP2 and TP4, with output terminal TP4 grounded.

3. The flyback isolated high-voltage input DC-DC power supply module according to claim 1, characterized in that: The power switching circuit includes a transformer T1; The transformer T1 includes a primary winding PRI, a secondary winding SEC, and an auxiliary winding AUX; The first and third pins of the primary winding PRI are connected, and the second and fourth pins of the primary winding PRI are connected. The eighth, tenth and twelfth pins of the secondary winding SEC are connected, and the seventh, ninth and eleventh pins of the secondary winding SEC are connected. The fifth pin of the auxiliary winding AUX is connected to the control circuit and the feedback circuit, and the sixth pin of the auxiliary winding AUX is grounded.

4. The flyback isolated high-voltage input DC-DC power supply module according to claim 3, characterized in that: The feedback circuit includes feedback adjustment resistors R11, R12, and R13; The two ends of the feedback adjustment resistor R11 are connected to the fifth pin of the auxiliary winding AUX and the control circuit, respectively; one end of the feedback adjustment resistors R12 and R13 is connected to the control circuit, and the other end is grounded.

5. The flyback isolated high-voltage input DC-DC power supply module according to claim 4, characterized in that: The control circuit includes an integrated chip U2; The first pin of integrated chip U2 is grounded; The second pin of integrated chip U2 is connected to the cathode of rectifier diode D2 and the cathode of Zener diode D4. The anode of rectifier diode D2 is connected to the fifth pin of auxiliary winding AUX through resistors R9 and R10. A series resistor R8 and capacitor C9 are connected across the two ends of rectifier diode D2. The anode of Zener diode D4 is grounded; A resistor R5 is connected in series between the second pin of integrated chip U2 and the input terminal TP1. The second pin of integrated chip U2 is grounded through capacitors C10 and C11. The third pin of the integrated chip U2 is connected to the fifth pin of the auxiliary winding AUX through resistor R11, and is grounded through resistors R12 and R13 and capacitor C12; The fourth and fifth pins of the integrated chip U2 are connected together and grounded through resistors R14 and R15; The sixth, seventh, and eighth pins of the integrated chip U2 are connected together, and are connected to the second and fourth pins of the primary winding PRI through an absorption circuit; The sixth, seventh, and eighth pins of the integrated chip U2 are grounded through capacitor C13.

6. The flyback isolated high-voltage input DC-DC power supply module according to claim 3, characterized in that: The input filter circuit includes capacitors C5, C6, and C7; One end of capacitors C5, C6 and C7 is grounded, and the other end is connected to input terminal TP1, the second pin and the fourth pin of the primary winding PRI; The output filter circuit includes capacitors C3 and C4; One end of capacitors C3 and C4 is grounded, and the other end outputs to terminal TP2 and the rectifier circuit.

7. The flyback isolated high-voltage input DC-DC power supply module according to claim 5, characterized in that: The absorption circuit includes resistors R3, R4, R6, and R7, capacitor C8, and diode D3; One end of resistors R3 and R4 and capacitor C8 is connected to the second and fourth pins of the primary winding PRI, and the other end is connected to one end of resistors R6 and R7; The other ends of resistors R6 and R7 are connected to the cathode of diode D3. The anode of diode D3 is connected to the second and fourth pins of the primary winding PRI and the sixth, seventh, and eighth pins of integrated chip U2.

8. The flyback isolated high-voltage input DC-DC power supply module according to claim 6, characterized in that: The rectifier circuit includes a first rectifier circuit and a second rectifier circuit. The first rectifier circuit includes a rectifier diode D1, the anode of which is connected to the eighth, tenth and twelfth pins of the secondary winding SEC, and the cathode of which is connected to one end of capacitors C3 and C4. The second rectifier circuit includes a synchronous rectifier chip U1, resistors R1 and R2, and capacitors C1 and C2; The third and fourth pins of the synchronous rectifier chip U1 are connected, and the eighth, tenth, and twelfth pins of the secondary winding SEC are also connected. The fifth and sixth pins of the synchronous rectifier chip U1 are connected together and also connected to one end of capacitors C3 and C4; The first pin of the synchronous rectifier chip U1 is connected to the third and fourth pins through capacitor C2, and the seventh pin is connected to the fifth and sixth pins through resistor R2. A resistor R1 and a capacitor C1 are connected in series between the fourth and sixth pins of the synchronous rectifier chip U1.

9. The flyback isolated high-voltage input DC-DC power supply module according to claim 3, characterized in that: The transformer T1 is a compact surface-mount high-frequency transformer.

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