Two-way isolated output switching power supply

Abstract

The utility model discloses a dual-path isolated output switching power supply, which comprises a positive output circuit and a negative output circuit, and is characterized in that the positive output end of the positive output circuit outputs positive voltage, and the negative output end of the negative output circuit outputs negative voltage; the positive output circuit and the negative output circuit share the same direct-current stabilized power supply of the input end; the positive output circuit comprises a pulse width modulation module, a positive feedback loop module, a first output rectifier module and a positive output filter module; the pulse width modulation module is connected with the direct-current stabilized power supply, the pulse width modulation module is connected with the first output rectifier module through the transformer, the first output rectifier module is connected with the positive output filter module, and the positive feedback loop module and the positive output filter module are connected with a positive output end; the transformer is connected with the power switch. According to the scheme, one direct-current stabilized power supply at the input end outputs different positive and negative voltages through double-path isolation, so that the working efficiency of the switching power supply can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of switching power supplies, and in particular to a dual-circuit isolated output switching power supply. Background Art

[0002] Power modules are an indispensable component of satellite communication equipment. With the rapid development of satellite communication technology, modern satellite communication equipment must simultaneously output different voltages to power the equipment. Therefore, to ensure the reliability and stability of satellite communication equipment, the stability, continuity, adaptability to various environments, and heat dissipation of the power supply voltage are all key factors in ensuring the equipment's efficient operation.

[0003] To ensure proper operation of many satellite communication devices requiring multiple voltage supplies, users often combine several independent power supplies to achieve multiple regulated outputs. While this approach can meet user and load requirements, it significantly increases cost and size. Interactions between modules can also generate beat frequency interference, negatively impacting the power system's performance and reliability. Furthermore, as satellite communication equipment requires increasingly lower voltages, higher requirements are placed on the accuracy and dynamic characteristics of each output voltage. Utility Model Content

[0004] The embodiments of the present application provide a dual-circuit isolated output switching power supply.

[0005] To achieve the above objectives, an embodiment of the present application provides a dual-circuit isolated output switching power supply, comprising: a positive output circuit and a negative output circuit, wherein the positive output terminal of the positive output circuit outputs a positive voltage, and the negative output terminal of the negative output circuit outputs a negative voltage;

[0006] The positive output circuit and the negative output circuit share the same DC regulated power supply with the same input terminal;

[0007] The positive output circuit includes: a pulse width modulation module, a positive feedback loop module, a first output rectification module, and a positive output filtering module;

[0008] The pulse width modulation module is connected to the DC regulated power supply, the pulse width modulation module is connected to the first output rectifier module through a transformer, the first output rectifier module is connected to the positive output filter module, and the positive feedback loop module and the positive output filter module are connected to the positive output terminal;

[0009] The transformer is connected to the power switch.

[0010] In one embodiment, the positive feedback loop module includes:

[0011] One end of the fourth resistor, one end of the seventh resistor, and one end of the eighth resistor are connected with the positive output terminal, the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor, one end of the seventh capacitor, and the first end of the three-terminal adjustable shunt regulator; the other end of the sixth resistor and the second end of the three-terminal adjustable shunt regulator are grounded, the third end of the three-terminal adjustable shunt regulator is connected with the other end of the seventh capacitor, the other end of the seventh resistor, and the photoelectric coupler; the photoelectric coupler is connected with the other end of the eighth resistor, one end of the ninth resistor, and one end of the eighth capacitor; the other end of the ninth resistor is connected with the other end of the eighth capacitor.

[0012] In one of the embodiments, the positive output filter module comprises:

[0013] One end of the first capacitor, one end of the second capacitor, and one end of the third capacitor are connected with the first output rectifier module and the positive output terminal, the other end of the first capacitor, the other end of the second capacitor, and the other end of the third capacitor are grounded and connected with the transformer, and the first output rectifier module is connected with the transformer.

[0014] In one of the embodiments, the negative output circuit comprises: a low dropout linear regulator module, a second output rectifier module, and a negative output filter module.

[0015] The DC regulated power supply is connected with the second output rectifier module through the transformer, the second output rectifier module is connected with the low dropout linear regulator module, the low dropout linear regulator module is connected with the negative output filter module, and the negative output filter module is connected with the negative output terminal.

[0016] In one of the embodiments, the negative output filter module comprises:

[0017] One end of the first resistor, one end of the fourth capacitor, and one end of the fifth capacitor are grounded and connected with the GND pin of the second output rectifier module and the low dropout linear regulator module, the other end of the first resistor is connected with one end of the second resistor and the 4 pin of the low dropout linear regulator module, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is connected with the OUT pin of the low dropout linear regulator module and the other end of the fourth capacitor, the other end of the fifth capacitor, and the negative output terminal.

[0018] In one of the embodiments, the transformer comprises: a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding.

[0019] The opposite end of the first primary winding is connected with the pulse width modulation module through the third diode; the same end of the first primary winding is grounded and connected with the negative electrode of the DC regulated power supply;

[0020] The same end of the second primary winding is connected with the positive electrode of the DC regulated power supply, and the opposite end of the second primary winding is connected with the power switch.

[0021] The opposite-name end of the first secondary winding is connected to the first output rectifier module; the same-name end of the first secondary winding is grounded;

[0022] The opposite-name end of the second secondary winding is connected to the second output rectifier module; the same-name end of the second secondary winding is connected to the low-voltage difference linear regulator module.

[0023] In one embodiment, an input filter module is provided between the transformer and the DC regulated power supply.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The high-voltage input of the DC regulated power supply of this solution is stepped down through a high-frequency transformer and output circuit, and the dual-channel isolated output has different positive and negative voltages, which improves the working efficiency of the equipment and ensures the stability of the power supply voltage. The pulse width modulation module and low-voltage difference linear regulator module are used to achieve high constant current accuracy, extend the life of satellite communication equipment, and improve the stability of satellite communication equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 This is a structural diagram of a dual-channel isolated output switching power supply according to an embodiment of the present application;

[0028] Figure 2 This is a circuit diagram of a dual-channel isolated output switching power supply according to an embodiment of the present application;

[0029] Figure 3 This is a schematic diagram of the transformer in the dual-isolated output switching power supply according to an embodiment of the present application;

[0030] Figure 4 This is a top view of the transformer structure in the dual-isolated output switching power supply according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0035] Referring to Figure 1 The embodiments of the present application provide a double-way isolated output switching power supply, comprising: a positive output circuit 1 and a negative output circuit 2, the positive output end 15 of the positive output circuit 1 outputs a positive voltage, and the negative output end 24 of the negative output circuit 2 outputs a negative voltage.

[0036] The positive output circuit 1 and the negative output circuit 2 share the same direct current voltage stabilizer 3 at the input end.

[0037] Specifically, the positive and negative output circuits share the same direct current voltage stabilizer 3, each output circuit is used to reduce the voltage of the direct current voltage stabilizer 3, and the two output circuits output positive and negative different voltages. It can be understood that by changing the value of the adjusting resistor in each output circuit, the output voltage value of each output circuit can be different. Exemplarily, the voltage value range of the direct current voltage stabilizer 3 is 18V-36V, due to the error, the value range of the positive output end 15 of the positive output circuit 1 is 14.85V to 15.15V, and the value range of the negative output end 24 of the negative output circuit 2 is -7.8V to -8.2V. It can be understood that the positive and negative output voltages are output at the same time under the action of the direct current voltage stabilizer 3, and share the same direct current voltage stabilizer 3 input end.

[0038] The double-path isolation output switching power supply provided by the embodiment of the present application reduces the high voltage of the DC regulated power supply through two output circuits, reduces the high voltage input by the DC regulated power supply into low voltage at the output end, meets more low voltage power consumption requirements, and can improve the working efficiency of the switching power supply and ensure the stability of the power supply voltage through the positive and negative double-path output circuits to output different voltages.

[0039] Continuing to refer to Figure 1 , the positive output circuit 1 comprises a pulse width modulation (PWM) module 11, a positive feedback loop module 12, a first output rectifier module 13, and a positive output filter module 14.

[0040] The pulse width modulation module 11 is connected with the DC regulated power supply 3, the pulse width modulation module 11 is connected with the first output rectifier module 13 through the transformer 4, the first output rectifier module 13 is connected with the positive output filter module 14, and the positive feedback loop module 12 and the positive output filter module 14 are connected with the positive output end 15.

[0041] The transformer 4 is connected with the power switch 5.

[0042] The power switch 5 can be a MOS tube, the transformer 4 can be a high-frequency transformer, and the PWM module 11 can be an integrated existing module.

[0043] In one embodiment, an input filter module 6 is arranged between the transformer 4 and the DC regulated power supply 3. The input filter module 6 can be a filter capacitor, such as Figure 2 the sixth capacitor C6 in the sixth embodiment.

[0044] Continuing to refer to Figure 2 , the positive feedback loop module 12 comprises:

[0045] One end of the fourth resistor R4, one end of the seventh resistor R7, and one end of the eighth resistor R8 are connected with the positive output end 15, the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6, one end of the seventh capacitor C7, and the first end of the three-terminal adjustable shunt regulator U1; the other end of the sixth resistor R6 and the second end of the three-terminal adjustable shunt regulator U1 are grounded, the third end of the three-terminal adjustable shunt regulator U1 is connected with the other end of the seventh capacitor C7, the other end of the seventh resistor R7, and the photoelectric coupler E1; the photoelectric coupler E1 is connected with the other end of the eighth resistor R8, one end of the ninth resistor R9, and one end of the eighth capacitor C8; the other end of the ninth resistor R9 is connected with the other end of the eighth capacitor C8.

[0046] Continuing to refer to Figure 2 , the positive output filter module 14 comprises:

[0047] One end of the first capacitor C1, one end of the second capacitor C2, and one end of the third capacitor C3 are connected with the first output rectifier module 13 and the positive output end 15, the other end of the first capacitor C1, the other end of the second capacitor C2, and the other end of the third capacitor C3 are grounded and connected with the transformer 4, and the first output rectifier module 13 is connected with the transformer 4.

[0048] Specifically, the first output rectifier module 13 adopts the first diode D1.

[0049] In one embodiment, continuing to refer to Figure 1 The negative output circuit 2 comprises a low dropout regulator (LDO) module 21, a second output rectifier module 22, and a negative output filter module 23.

[0050] The DC regulated power supply 3 is connected with the second output rectifier module 22 and the LDO module 21 through the transformer 4, the second output rectifier module 22 is connected with the LDO module 21, the LDO module 21 is connected with the negative output filter module 23, and the negative output filter module 23 is connected with the negative output end 24.

[0051] The second output rectifier module 22 adopts the second diode D2.

[0052] The LDO module 21 used in the negative output circuit 2 is an integrated existing module, and the use of the LDO module can ensure the stability of the output voltage, which is suitable for industrial control, communication equipment, radar, and other scenarios with high requirements for power stability.

[0053] In one embodiment, continuing to refer to Figure 2 The negative output filter module 23 comprises:

[0054] One end of the first resistor R1, one end of the fourth capacitor C4, and one end of the fifth capacitor C5 are grounded and connected with the GND pin of the second output rectifier module 22 and the LDO module 21, the other end of the first resistor R1 is connected with one end of the second resistor R2 and the 4 pin of the LDO module 21, the other end of the second resistor R2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with the OUT pin of the LDO module 21 and the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, and the negative output end 24, and the VIN pin, the 1 pin, and the 2 pin of the LDO module 21 are connected with the transformer.

[0055] Specifically, by adjusting the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 of the positive output circuit 1 and the first resistor R1, the second resistor R2 and the third resistor R3 of the negative output circuit 2, different voltages can be outputted.

[0056] The back end of the capacitor in the positive output filter is connected with the front end of the capacitor in the negative output filter module 23, and the ground end of the LDO module of the negative output circuit 2 is connected with the ground end of the positive output circuit 1 and the negative output circuit 2.

[0057] In one embodiment, the transformer 4 comprises: a first primary winding a, a second primary winding b, a first secondary winding c and a second secondary winding d.

[0058] The non-name end of the first primary winding a is connected with the pulse width modulation module 11 through the third diode D3; the same name end of the first primary winding a is grounded and connected with the negative pole of the direct current voltage stabilizing power supply 3;

[0059] The same name end of the second primary winding b is connected with the positive pole of the direct current voltage stabilizing power supply 3, and the non-name end of the second primary winding b is connected with the power switch 5.

[0060] The non-name end of the first secondary winding c is connected with the first output rectifier module 13; the same name end of the first secondary winding c is grounded.

[0061] The non-name end of the second secondary winding d is connected with the second output rectifier module 22; the same name end of the second secondary winding d is connected with the low dropout linear voltage regulator module 21.

[0062] As shown in Figure 3 , As shown in Figure 4 , the first primary winding a and the second primary winding b and the first secondary winding c and the second secondary winding d are wound on the transformer 4 framework by using the enameled wire, the number of turns between the several secondary windings c and d is different, so that the double-way isolation switch power supply outputs positive and negative different voltage values.

[0063] The transformer magnetic core e is a manganese core ferrite magnetic core, the magnetic core e is a group of two, two magnetic cores are symmetrically arranged at both ends of the skeleton, the magnetic core is a P11 type magnetic core, the P11 magnetic core has excellent characteristics of high permeability and low loss, can meet the low loss requirement of the transformer 4, and the magnetic core has good electromagnetic shielding effect, small leakage inductance and good window area, can meet the requirements of electromagnetic shielding, small leakage inductance and temperature rise of the transformer 4, the manganese-zinc ferrite magnetic core has low power loss, high saturation magnetic flux density and permeability in a wide working temperature range, excellent performance, to reduce the loss of the switching power supply transformer, the enameled wire has the advantage of high insulation strength (>=3kV), ensures the reliability of the transformer, and does not need to add a barrier layer to ensure the safety distance during winding, nor need to add an insulating tape layer between the windings, which can effectively reduce the use of transformer materials, reduce the weight of the transformer, at the same time, because the insulating tape layer is not needed, the coil can better dissipate heat, meet the requirement of coil temperature rise, effectively simplify the production process and save materials, reduce the weight of the transformer, and further ensure that the multi-channel switching power supply transformer is small in size and light in weight, facilitating the miniaturization of the multi-channel switching power supply transformer, and the transformer lead needs to be shrunk and depainted.

[0064] The magnetic core of the high-frequency transformer is fixed with transformer glue, the side hole and the middle hole are filled with 414 glue, and a layer of polyimide adhesive tape is added at the position corresponding to the shell. The 414 glue is suitable for fast packaging, reduces the waiting time, can effectively isolate moisture after filling the hole, prevents the internal coil from being damp or oxidized, prolongs the service life of the transformer, can prevent the displacement of the magnetic core or the coil, improves the shock resistance, and is especially suitable for large carriers, industrial equipment and other scenes. The transformer installation shrunk and depainted must be sleeved with a heat shrink tube.

[0065] The double-channel isolated output switching power supply provided by the application reduces the voltage through the high-frequency transformer and the output circuit, and outputs different positive and negative voltages, which improves the working efficiency of the equipment and ensures the stability of the power supply voltage. The PWM module and the LDO module are used to realize high constant current accuracy, prolong the service life of the satellite communication equipment, and improve the stability of the satellite communication equipment.

[0066] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any change or replacement within the technical scope disclosed in the application should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A dual isolated output switching power supply, characterized by, The application relates to a positive and negative output circuit. The positive output circuit and the negative output circuit share the same direct-current voltage stabilizer as the input terminal; The positive output circuit comprises a pulse width modulation module, a positive feedback loop module, a first output rectifier module and a positive output filter module; The pulse width modulation module is connected with the direct-current voltage stabilizer, the pulse width modulation module is connected with the first output rectifier module through a transformer, the first output rectifier module is connected with the positive output filter module, and the positive feedback loop module and the positive output filter module are connected with the positive output terminal; The transformer is connected with a power switch. The positive feedback loop module comprises:

2. The dual isolated output switching power supply of claim 1, wherein, One end of a fourth resistor, one end of a seventh resistor and one end of an eighth resistor are connected with the positive output terminal, the other end of the fourth resistor is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with one end of a sixth resistor, one end of a seventh capacitor and a first end of a three-terminal adjustable shunt regulator; the other end of the sixth resistor and a second end of the three-terminal adjustable shunt regulator are grounded, a third end of the three-terminal adjustable shunt regulator is connected with the other end of the seventh capacitor, the other end of the seventh resistor and an optical coupler; the optical coupler is connected with the other end of the eighth resistor, one end of a ninth resistor and one end of an eighth capacitor; the other end of the ninth resistor is connected with the other end of the eighth capacitor. The positive output filter module comprises:

3. The dual isolated output switching power supply of claim 1, wherein, One end of a first capacitor, one end of a second capacitor and one end of a third capacitor are connected with the first output rectifier module and the positive output terminal, the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are grounded and connected with the transformer, and the first output rectifier module is connected with the transformer. The negative output circuit comprises a low-dropout linear voltage regulator module, a second output rectifier module and a negative output filter module; 4. The dual isolated output switching power supply of claim 1, wherein, The direct-current voltage stabilizer is connected with the second output rectifier module through the transformer, the second output rectifier module is connected with the low-dropout linear voltage regulator module, the low-dropout linear voltage regulator module is connected with the negative output filter module, and the negative output filter module is connected with the negative output terminal. The negative output filter module comprises:

5. The dual isolated output switching power supply of claim 4, wherein, One end of a first resistor, one end of a fourth capacitor and one end of a fifth capacitor are grounded and connected with the GND pin of the second output rectifier module and the low-dropout linear voltage regulator module, the other end of the first resistor is connected with one end of a second resistor and the 4 pin of the low-dropout linear voltage regulator module, the other end of the second resistor is connected with one end of a third resistor, the other end of the third resistor is connected with the OUT pin of the low-dropout linear voltage regulator module and the other end of the fourth capacitor, the other end of the fifth capacitor and the negative output terminal. The transformer comprises a first primary winding, a second primary winding, a first secondary winding and a second secondary winding.

6. The dual isolated output switching power supply of claim 4, wherein, ​ The opposite end of the first primary winding is connected with the pulse width modulation module through a third diode; the same end of the first primary winding is grounded and connected with the negative pole of the direct current voltage stabilizer; The same end of the second primary winding is connected with the positive pole of the direct current voltage stabilizer, and the opposite end of the second primary winding is connected with the power switch; The opposite end of the first secondary winding is connected with the first output rectification module; the same end of the first secondary winding is grounded; The opposite end of the second secondary winding is connected with the second output rectification module; the same end of the second secondary winding is connected with the low dropout linear voltage regulator module.

7. The dual isolated output switching power supply of claim 1, wherein, An input filter module is arranged between the transformer and the direct current voltage stabilizer.

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