An airborne power-off maintenance switching circuit and its switching method

Abstract

The present application discloses an airborne power supply power-off maintenance switching circuit and a switching method thereof, relating to the technical field of electronic circuits. The switching circuit of this solution includes a charging module, a slow charging and fast discharging circuit module, a switching circuit module, and a comparison circuit module; the charging module is electrically connected to the slow charging and fast discharging circuit module and charges the slow charging and fast discharging circuit module; the slow charging and fast discharging circuit module is electrically connected to the airborne power supply module and is used to maintain the stability of the voltage of the airborne power supply module; the switching circuit module is electrically connected to the slow charging and fast discharging circuit module and is used to control the slow charging and fast discharging circuit module to supply power to the main circuit; the comparison circuit module is respectively electrically connected to the switching circuit module and the power supply characteristic unit and is used to send control signals to the switching circuit module and the charging module respectively to control the slow charging and fast discharging circuit module to discharge the airborne power supply module. By adopting the airborne power supply power-off maintenance switching circuit and the switching method thereof of the present invention, the miniaturization requirement and the light weight requirement of airborne equipment are realized.

Description

Technical Field

[0001] This application relates to the technical field of electronic circuits, and particularly to an airborne power supply power-down maintenance switching circuit and a switching method thereof. Background Art

[0002] In order to meet the reliability requirements of equipment, airborne electronic equipment needs to perform necessary data processing, storage, and transmission operations when the power supply is powered down. Therefore, the switching power supply of airborne electronic equipment usually needs to have an instantaneous power-down holding function.

[0003] Currently, the main instantaneous power-down holding circuit is realized by connecting a large-capacity capacitor in parallel at the input end of the power supply. However, large-capacity capacitors usually have disadvantages such as large volume and large weight, which are not conducive to reducing the volume and weight of airborne electronic equipment. Summary of the Invention

[0004] The embodiments of this application provide an airborne power supply power-down maintenance switching circuit and a switching method thereof, which solve the problem that the power-down maintenance circuit of the airborne power supply in the prior art is not conducive to reducing the volume and weight of airborne electronic equipment, and realize the miniaturization and light weight requirements of airborne equipment.

[0005] The embodiments of the present invention provide an airborne power supply power-down maintenance switching circuit, including a charging module, a slow charge and fast discharge circuit module, a switching circuit module, an auxiliary power supply module, and a comparison circuit module;

[0006] The charging module is electrically connected to the slow charge and fast discharge circuit module and is used to charge the slow charge and fast discharge circuit module;

[0007] The slow charge and fast discharge circuit module is electrically connected to the airborne power supply module and is used to maintain the stability of the voltage of the airborne power supply module;

[0008] The switching circuit module is electrically connected to the slow charge and fast discharge circuit module and is used to control the slow charge and fast discharge circuit module to supply power to the main circuit after receiving the signal sent by the comparison circuit module;

[0009] The comparison circuit module is respectively electrically connected to the switching circuit module and the power supply characteristic unit, and is used to compare the sampled power supply voltage with the reference voltage designed by the comparison circuit module, and then send control signals to the switching circuit module and the charging module respectively to realize the power supply of the slow charge and fast discharge circuit module to the main circuit;

[0010] The auxiliary power supply module is electrically connected to the slow charge and fast discharge circuit module and is used to supply power to the comparison circuit module.

[0011] Furthermore, the charging module includes a filter and a DC / dc converter;

[0012] The input end of the filter is connected to the power supply characteristic unit, and the output end of the filter is connected to the input end of the DC / dc converter;

[0013] The output end of the DC / dc converter is connected to the slow charging and fast discharging circuit module.

[0014] Furthermore, the slow charging and fast discharging circuit module includes a first resistor, a polarized capacitor, a first diode, and a second resistor;

[0015] The input end of the first resistor is connected to the output end of the DC / dc converter, and the output end of the first resistor is connected to the input end of the first diode;

[0016] The input end of the second resistor is connected to the output end of the first resistor, and the output end of the second resistor is connected to the switching circuit module;

[0017] The output end of the first diode is connected to the on-board power module;

[0018] The positive electrode of the polarized capacitor is connected to the output end of the first resistor, and the negative electrode of the polarized capacitor is connected to the switching circuit module.

[0019] Furthermore, the switching circuit module includes a first voltage regulator diode, a third resistor, a first nmos transistor, a fourth resistor, an optocoupler, a fifth resistor, a second voltage regulator diode, and a second nmos transistor;

[0020] The input end of the fifth resistor is connected to the comparison circuit module, and the output end of the fifth resistor is connected to the input end of the optocoupler;

[0021] The output end of the optocoupler is connected to the input end of the fourth resistor;

[0022] The output end of the fourth resistor is connected to the gate of the first nmos transistor;

[0023] The source of the first nmos transistor is connected to the source of the second nmos transistor;

[0024] The drain of the second nmos transistor is connected to the negative electrode of the polarized capacitor;

[0025] The input end of the third resistor is connected to the source of the first nmos transistor, and the output end of the third resistor is connected to the output end of the fourth resistor;

[0026] The input end of the first voltage regulator diode is connected to the output end of the optocoupler, and the output end of the first voltage regulator diode is connected to the source of the first nmos transistor;

[0027] The input end of the second voltage regulator diode is connected to the output end of the fourth resistor, and the output end of the second voltage regulator diode is connected to the source of the second NMOS transistor.

[0028] Further, the comparison circuit module includes a first operational amplifier comparator, a second operational amplifier comparator, and a second triode;

[0029] The inverting input end of the first operational amplifier comparator is connected to the power supply characteristic unit, the non-inverting input end of the first operational amplifier comparator is connected to the auxiliary power supply module, the output end of the first operational amplifier comparator is connected to the input end of the fifth resistor, the positive terminal of the first operational amplifier comparator is connected to the reference voltage circuit, and the negative terminal of the first operational amplifier comparator is grounded;

[0030] The non-inverting input end of the second operational amplifier comparator is connected to the auxiliary power supply module, the inverting input end of the second operational amplifier comparator is connected to the input end of the charging module, the output end of the second operational amplifier comparator is connected to the base of the second triode, the positive terminal of the second operational amplifier comparator is connected to the reference voltage circuit, and the negative terminal of the second operational amplifier comparator is grounded;

[0031] The collector of the second triode sends a control signal to the switching circuit module and the charging module, and the emitter of the second triode is grounded.

[0032] Further, the auxiliary power supply module includes a sixth resistor, a seventh resistor, an eighth resistor, a third voltage regulator diode, a first triode, and a ninth resistor;

[0033] The input end of the sixth resistor is connected to the first diode, and the output end of the sixth resistor is connected to the input end of the eighth resistor;

[0034] The input end of the seventh resistor is connected to the output end of the first diode, and the output end of the seventh resistor is connected to the input end of the eighth resistor;

[0035] The output end of the eighth resistor is connected to the base of the first triode;

[0036] The collector of the first triode is connected to the output ends of the sixth resistor and the seventh resistor, the emitter of the first triode is connected to the input end of the ninth resistor, and the output end of the ninth resistor is connected to the non-inverting input end of the first operational amplifier comparator;

[0037] The input end of the third voltage regulator diode is connected to the input end of the eighth resistor, and the output end of the third voltage regulator diode is grounded.

[0038] A switching method for an airborne power supply power-off maintenance switching circuit includes the following steps:

[0039] When the airborne power supply module is in a normal state, the comparison circuit module controls the charging module to cut off, and the airborne power supply module supplies power normally;

[0040] When the airborne power supply module is in an abnormal state, the circuit of the machine power supply characteristic unit is switched to the charging module. The comparison circuit module controls the charging module to charge the slow charge and fast discharge circuit module, and controls the slow charge and fast discharge circuit module to supply power to the main circuit.

[0041] Furthermore, when the airborne power supply module is in an abnormal state, the circuit of the power supply characteristic unit is switched to the charging module. The comparison circuit module controls the charging module to charge the slow charge and fast discharge circuit module, and controls the slow charge and fast discharge circuit module to supply power to the main circuit, including:

[0042] When the airborne power supply module loses power, the comparison circuit module compares the input voltage of the airborne power supply module with the reference voltage set by the comparison circuit module. When the input voltage is lower than the reference voltage, the comparison circuit module controls the charging module to charge the slow charge and fast discharge circuit module, and controls the slow charge and fast discharge circuit module to supply power to the main circuit.

[0043] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0044] An on-board power supply power-down maintenance switching circuit and its switching method provided by an embodiment of the present invention adopt a charging module, a slow charge and fast discharge circuit module, a switching circuit module, and a comparison circuit module. Specifically, when the on-board power supply is in normal use, the charging module, the slow charge and fast discharge circuit module, the switching circuit module, and the comparison circuit module do not participate in the main circuit operation, and the on-board power supply module normally supplies power to the main circuit. When the on-board power supply module has an abnormal rapid power-down, the charging module, the slow charge and fast discharge circuit module, the switching circuit module, and the comparison circuit module start to work. The auxiliary power supply module supplies power to the comparison circuit module. The comparison circuit module samples the input voltage of the on-board power supply module, that is, the power supply voltage of the power supply characteristic unit, and compares the input voltage of the on-board power supply module with the reference voltage. When the input voltage is lower than the set value, that is, the reference voltage, the operational amplifier works and outputs two groups of signals. One group of signals controls the charging module to charge the slow charge and fast discharge circuit module, and the other group of signals controls the slow charge and fast discharge circuit module to discharge to the main circuit through the switching circuit module to maintain the normal operation of the circuit. When the input voltage returns to normal, that is, the input voltage is not lower than the set value, that is, the reference voltage, the comparison circuit module controls the charging module to stop charging the slow charge and fast discharge circuit module, and then cuts off the discharge of the slow charge and fast discharge circuit module to the main circuit, and the on-board power supply module normally supplies power to the main circuit. By using the on-board power supply power-down maintenance switching circuit of the present invention, the problem that the power-down maintenance circuit of the on-board power supply in the prior art is not conducive to reducing the volume and weight of the on-board electronic equipment is effectively solved, and the miniaturization requirement and light weight requirement of the on-board equipment are realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments of the present invention. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic structural diagram of the on-board power supply power-down maintenance switching circuit provided by the embodiment of the present application;

[0047] Figure 2 It is a circuit diagram of the on-board power supply power-down maintenance switching circuit provided by the embodiment of the present application.

[0048] Icons: 1. Airborne power module; 2. Charging module; 21. Filter; 22. First capacitor; 23. Second capacitor; 24. DC / dc converter; 25. Third capacitor; 3. Slow charge and fast discharge circuit module; 31. First resistor; 32. Polarized capacitor; 33. First diode; 34. Second resistor; 4. Switching circuit module; 41. First zener diode; 42. Third resistor; 43. First nmos transistor; 44. Fourth resistor; 45. Optocoupler; 46. Fifth resistor; 47. Second zener diode; 48. Second nmos transistor; 5. Auxiliary power module; 51. Sixth resistor; 52. Seventh resistor; 53. Eighth resistor; 54. Third zener diode; 55. Fourth capacitor; 56. First triode; 57. Fifth capacitor; 58. Sixth capacitor; 59. Second diode; 510. Ninth resistor; 6. Comparison circuit module; 61. Tenth resistor; 62. Seventh capacitor; 63. Eleventh resistor; 64. First operational amplifier comparator; 65. Twelfth resistor; 66. Thirteenth resistor; 67. Fourteenth resistor; 68. Eighth capacitor; 69. Fifteenth resistor; 610. Ninth capacitor; 611. Sixteenth resistor; 612. Second operational amplifier comparator; 613. Seventeenth resistor; 614. Eighteenth resistor; 615. Nineteenth resistor; 616. Twentieth resistor; 617. Twenty-first resistor; 618. Second triode; 619. Third diode. Detailed implementation

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0051] In the prior art, the commonly used power-off maintenance method is usually to set a set of boost modules in the airborne power supply circuit. When the airborne power supply has a short power-off, the voltage is boosted by the boost module and then supplied to the main circuit. The boost module requires high power, which will generate electromagnetic interference to the main circuit on the one hand, and is expensive and occupies a large space on the other hand. Therefore, it is not conducive to wide application.

[0052] The embodiment of the present invention provides an airborne power supply power-off maintenance switching circuit, including a charging module 2, a slow charge and fast discharge circuit module 3, a switching circuit module 4, and a comparison circuit module 6; the charging module 2 is electrically connected to the slow charge and fast discharge circuit module 3 and is used to charge the slow charge and fast discharge circuit module 3; the slow charge and fast discharge circuit module 3 is electrically connected to the airborne power supply module 1 and is used to maintain the stability of the voltage of the airborne power supply module 1; the switching circuit module 4 is electrically connected to the slow charge and fast discharge circuit module 3 and is used to control the slow charge and fast discharge circuit module 3 to supply power to the main circuit after receiving the signal sent by the comparison circuit module 6; the comparison circuit module 6 is respectively electrically connected to the switching circuit module 4 and the power supply characteristic unit, and is used to compare the sampled power supply voltage with the reference voltage designed by the comparison circuit module 6 and then send control signals to the switching circuit module 4 and the charging module 2 respectively to realize the discharge of the slow charge and fast discharge circuit module 3 to the main circuit; the auxiliary power supply module 5 is electrically connected to the comparison circuit module 6 and is used to supply power to the comparison circuit module 6.

[0053] Such as Figure 1As shown in the figure, an on-board power supply power-down maintenance switching circuit provided by an embodiment of the present invention adopts a charging module 2, a slow charging and fast discharging circuit module 3, a switching circuit module 4, an auxiliary power supply module 5, and a comparison circuit module 6. Specifically, when the on-board power supply is in normal use, the charging module 2, the slow charging and fast discharging circuit module 3, the switching circuit module 4, and the comparison circuit module 6 do not participate in the main circuit operation, and the on-board power supply module 1 normally supplies power to the main circuit. When the on-board power supply experiences an abnormal rapid power-down, the charging module 2, the slow charging and fast discharging circuit module 3, the switching circuit module 4, and the comparison circuit module 6 start to operate. The auxiliary power supply module 5 supplies power to the comparison circuit module 6. The comparison circuit module 6 samples the input voltage of the on-board power supply module 1 and compares the input voltage of the on-board power supply module 1, that is, the power supply voltage of the power supply characteristic unit (i.e., Figure 1 Vin = 28V / dc in with a reference voltage. When the input voltage is lower than the set value, that is, the reference voltage, the operational amplifier operates and outputs two sets of signals. One set of signals controls the charging module 2 to charge the slow charging and fast discharging circuit module 3, and the other set of signals controls the slow charging and fast discharging circuit module 3 to discharge to the main circuit through the switching circuit module 4 to maintain the normal operation of the circuit. When the input voltage returns to normal, that is, when the input voltage is not lower than the set value, that is, the reference voltage, the comparison circuit module 6 controls the charging module 2 to stop charging the slow charging and fast discharging circuit module 3, and then cuts off the discharge of the slow charging and fast discharging circuit module 3 to the main circuit, and the on-board power supply module 1 normally supplies power to the main circuit. By using the on-board power supply power-down maintenance switching circuit of the present invention, the number of high-power boost modules used is reduced, the electromagnetic compatibility between modules is improved, space is saved, cost is saved, the problem that the power-down maintenance circuit of the on-board power supply in the prior art is not conducive to reducing the volume and weight of on-board electronic devices is effectively solved, the miniaturization requirement and light-weight requirement of on-board devices are realized, and the input cost is reduced.

[0054] Combined with Figure 1 and Figure 2 , the charging module 2 includes a filter 21 and a DC / dc converter 24; the input end of the filter 21 is connected to the power supply characteristic unit, and the output end of the filter 21 is connected to the input end of the DC / dc converter 24; the output end of the DC / dc converter 24 is connected to the slow charging and fast discharging circuit module 3.

[0055] A filter 21 is provided in the charging module 2 to filter the voltage in the on-board power module 1 through the filter 21, which is used to eliminate the ripple of the DC power supply in the on-board power module 1. In addition, a DC / dc converter 24 is provided in the charging module 2. The DC / dc converter 24 uses a low-power DC / dc converter (power 10W). When the on-board power module 1 is in a normal state, the input voltage of the normal on-board power module 1 is between 9V and 36V. Through the conversion of the DC / dc converter 24, the charging module 2 does not participate in the operation of the main circuit. When the on-board power module 1 experiences abnormal power-off, that is, when the input voltage is lower than 9V, the DC / dc converter 24 can receive the control signal of the comparison circuit module 6 and charge the slow charge and fast discharge circuit module 3.

[0056] In this embodiment, the charging module 2 further includes a first capacitor 22, a second capacitor 23, and a third capacitor 25. Specifically, the positive electrode of the first capacitor 22 is connected to the output end of the filter 21, the negative electrode of the first capacitor 22 is connected to the input end of the DC / dc converter 24, the positive electrode of the second capacitor 23 is connected to the output end of the filter 21, the negative electrode of the second capacitor 23 is connected to the input end of the DC / dc converter 24, the positive electrode of the third capacitor 25 is connected to the positive voltage output end of the DC / dc converter 24, and the negative electrode of the third capacitor 25 is connected to the negative voltage output end.

[0057] As Figure 2 shown, the slow charge and fast discharge circuit module 3 includes a first resistor 31, a polarized capacitor 32, a first diode 33, and a second resistor 34. The input end of the first resistor 31 is connected to the output end of the DC / dc converter 24, and the output end of the first resistor 31 is connected to the input end of the first diode 33. The input end of the second resistor 34 is connected to the output end of the first resistor 31, and the output end of the second resistor 34 is connected to the switching circuit module 4. The output end of the first diode 33 is connected to the on-board power module 1. The positive electrode of the polarized capacitor 32 is connected to the output end of the first resistor 31, and the negative electrode of the polarized capacitor 32 is connected to the switching circuit module 4.

[0058] In this embodiment, through the connection between the first resistor 31, the polarized capacitor 32, the first diode 33, and the second resistor 34, the slow charge and fast discharge circuit module 3 of this embodiment is jointly formed. Since a large capacitor requires a current-limiting design during charging and a fast response during discharging, a power resistor and a diode are connected in series in front of the capacitor of the slow charge and fast discharge circuit module 3 to design the fast charge and slow discharge circuit of this embodiment.

[0059] Reference Figure 2, the switching circuit module 4 includes a first voltage regulator diode 41, a third resistor 42, a first NMOS transistor 43, a fourth resistor 44, an optocoupler 45, a fifth resistor 46, a second voltage regulator diode 47, and a second NMOS transistor 48; the input end of the fifth resistor 46 is connected to the comparison circuit module 6, and the output end of the fifth resistor 46 is connected to the input end of the optocoupler 45; the output end of the optocoupler 45 is connected to the input end of the fourth resistor 44; the output end of the fourth resistor 44 is connected to the gate of the first NMOS transistor 43; the source of the first NMOS transistor 43 is connected to the source of the second NMOS transistor 48; the drain of the second NMOS transistor 48 is connected to the negative electrode of the polarized capacitor 32; the input end of the third resistor 42 is connected to the source of the first NMOS transistor 43, and the output end of the third resistor 42 is connected to the output end of the fourth resistor 44; the input end of the first voltage regulator diode 41 is connected to the output end of the optocoupler 45, and the output end of the first voltage regulator diode 41 is connected to the source of the first NMOS transistor 43; the input end of the second voltage regulator diode 47 is connected to the output end of the fourth resistor 44, and the output end of the second voltage regulator diode 47 is connected to the source of the second NMOS transistor 48.

[0060] In this embodiment, through the connection among the first voltage regulator diode 41, the third resistor 42, the first NMOS transistor 43, the fourth resistor 44, the optocoupler 45, the fifth resistor 46, the second voltage regulator diode 47, and the second NMOS transistor 48, the switching circuit module 4 of this embodiment is jointly constituted, and two NMOS transistors are connected in series on the negative electrode of the capacitor to receive the signal of the comparison circuit module 6 and switch the high-power capacitor of the slow charge and fast discharge circuit module 3 from the external charging circuit to the internal discharge circuit.

[0061] Combined Figure 2 , the comparison circuit module 6 includes a first operational amplifier comparator 64, a second operational amplifier comparator 612, and a second triode 618; the inverting input end of the first operational amplifier comparator 64 is connected to the power supply characteristic unit, the non-inverting input end of the first operational amplifier comparator 64 is connected to the auxiliary power supply module 5, the output end of the first operational amplifier comparator 64 is connected to the input end of the fifth resistor 46, the positive terminal of the first operational amplifier comparator 64 is connected to the reference voltage circuit, and the negative terminal of the first operational amplifier comparator 64 is grounded; the non-inverting input end of the second operational amplifier comparator 612 is connected to the auxiliary power supply module 5, the inverting input end of the second operational amplifier comparator 612 is connected to the input end of the charging module 2, the output end of the second operational amplifier comparator 612 is connected to the base of the second triode 618, the positive terminal of the second operational amplifier comparator 612 is connected to the reference voltage circuit, and the negative terminal of the second operational amplifier comparator 612 is grounded; the collector of the second triode 618 sends a control signal to the switching circuit module 4 and the charging module 2, and the emitter of the second triode 618 is grounded.

[0062] In this embodiment, the comparison circuit module 6 further includes a tenth resistor 61, a seventh capacitor 62, an eleventh resistor 63, a twelfth resistor 65, a thirteenth resistor 66, a fourteenth resistor 67, an eighth capacitor 68, a fifteenth resistor 69, a ninth capacitor 610, a sixteenth resistor 611, a seventeenth resistor 613, an eighteenth resistor 614, a nineteenth resistor 615, a twentieth resistor 616, a twenty-first resistor 617, and a third diode 619. Specifically, the input end of the tenth resistor 61 is connected to the output end of the auxiliary power supply module 5, and the output end of the tenth resistor 61 is connected to the non-inverting input end of the first operational amplifier comparator 64; the positive electrode of the seventh capacitor 62 is connected to the output end of the tenth resistor 61, and the negative electrode of the seventh capacitor 62 is connected to the output end of the first operational amplifier comparator 64; the input end of the eleventh resistor 63 is connected to the output end of the tenth resistor 61, and the output end of the eleventh resistor 63 is connected to the output end of the first operational amplifier comparator 64; the input end of the twelfth resistor 65 is connected to the input end of the DC / dc converter 24, and the output end of the twelfth resistor 65 is connected to the inverting input end of the first operational amplifier comparator 64; the input end of the thirteenth resistor 66 is connected to the output end of the twelfth resistor 65, and the output end of the thirteenth resistor 66 is grounded; the input end of the fourteenth resistor 67 is connected to the output end of the twelfth resistor 65, and the output end of the fourteenth resistor 67 is grounded; the positive electrode of the eighth capacitor 68 is connected to the output end of the thirteenth resistor 66 and / or the fourteenth resistor 67, and the negative electrode of the eighth capacitor 68 is connected to the reference voltage circuit (the reference voltage circuit refers to the reference voltage circuit designed by the comparison circuit module 6); the input end of the fifteenth resistor 69 is connected to the output end of the auxiliary power supply module 5, and the output end of the fifteenth resistor 69 is connected to the non-inverting input end of the second operational amplifier comparator 612; the positive electrode of the ninth capacitor 610 is connected to the output end of the fifteenth resistor 69, and the negative electrode of the ninth capacitor 610 is connected to the output end of the second operational amplifier comparator 612; the input end of the sixteenth resistor 611 is connected to the output end of the fifteenth resistor 69, and the output end of the sixteenth resistor 611 is connected to the output end of the second operational amplifier comparator 612; the input end of the seventeenth resistor 613 is connected to the input end of the DC / dc converter 24, and the output end of the seventeenth resistor 613 is connected to the inverting input end of the second operational amplifier comparator 612; the input end of the eighteenth resistor 614 is connected to the output end of the seventeenth resistor 613, and the output end of the eighteenth resistor 614 is grounded; the input end of the nineteenth resistor 615 is connected to the output end of the seventeenth resistor 613, and the output end of the nineteenth resistor 615 is grounded; the input end of the twentieth resistor 616 is connected to the output end of the second operational amplifier comparator 612, and the output end of the twentieth resistor 616 is connected to the base of the second triode 618; the input end of the twenty-first resistor 617 is connected to the output end of the twentieth resistor 616, and the output end of the twenty-first resistor 617 is grounded; the input end of the third diode 619 is connected to the auxiliary power supply module 5, and the output end of the third diode 619 is grounded.

[0063] Through the connections among the above-mentioned first operational amplifier comparator 64, second operational amplifier comparator 612, second triode 618, tenth resistor 61, seventh capacitor 62, eleventh resistor 63, twelfth resistor 65, thirteenth resistor 66, fourteenth resistor 67, eighth capacitor 68, fifteenth resistor 69, ninth capacitor 610, sixteenth resistor 611, seventeenth resistor 613, eighteenth resistor 614, nineteenth resistor 615, twentieth resistor 616, twenty-first resistor 617, and third diode 619, the comparison circuit module 6 of this embodiment is jointly constituted to realize the control of whether the slow charge and fast discharge circuit module 3 discharges by the comparison circuit module 6 for the main circuit to charge.

[0064] Reference Figure 2 , the auxiliary power supply module 5 includes a sixth resistor 51, a seventh resistor 52, an eighth resistor 53, a third voltage regulator diode 54, a first triode 56, and a ninth resistor 510; the input end of the sixth resistor 51 is connected to the output end of the first diode 33, and the output end of the sixth resistor 51 is connected to the input end of the eighth resistor 53; the input end of the seventh resistor 52 is connected to the output end of the first diode 33, and the output end of the seventh resistor 52 is connected to the input end of the eighth resistor 53; the output end of the eighth resistor 53 is connected to the base of the first triode 56; the collector of the first triode 56 is connected to the output ends of the sixth resistor 51 and the seventh resistor 52, the emitter of the first triode 56 is connected to the input end of the ninth resistor 510, and the output end of the ninth resistor 510 is connected to the non-inverting input end of the first operational amplifier comparator 64; the input end of the third voltage regulator diode 54 is connected to the input end of the eighth resistor 53, and the output end of the third voltage regulator diode 54 is grounded.

[0065] In this embodiment, the auxiliary power supply module 5 further includes a fourth capacitor 55, a fifth capacitor 57, a sixth capacitor 58, and a second diode 59. Specifically, the positive electrode of the fourth capacitor 55 is connected to the output end of the eighth resistor 53, the negative electrode of the fourth capacitor 55 is connected to the output end of the third voltage regulator diode 54, the positive electrode of the fifth capacitor 57 is connected to the emitter of the first triode 56, and the negative electrode of the fifth capacitor 57 is grounded; the positive electrode of the sixth capacitor 58 is connected to the emitter of the first triode 56, and the negative electrode of the sixth capacitor 58 is grounded; the input end of the second diode 59 is connected to the emitter of the first triode 56, and the output end of the second diode 59 is connected to the reference voltage circuit.

[0066] Through the connections among the sixth resistor 51, seventh resistor 52, eighth resistor 53, third voltage regulator diode 54, first triode 56, ninth resistor 510, fourth capacitor 55, fifth capacitor 57, sixth capacitor 58, and second diode 59, the auxiliary power supply module 5 of this embodiment is jointly constituted as a simple voltage stabilization circuit for supplying power to the comparison circuit module 6.

[0067] A switching method for an airborne power supply power-off maintenance switching circuit, comprising the following steps:

[0068] When the airborne power supply module 1 is in a normal state, the comparison circuit module 6 controls the charging module 2 to cut off, and the airborne power supply module 1 supplies power normally (to the main circuit).

[0069] When the airborne power supply module 1 is in an abnormal state, the circuit of the power supply characteristic unit is switched to the charging module 2. The comparison circuit module 6 controls the charging module 2 to charge the slow charge and fast discharge circuit module 3, and controls the slow charge and fast discharge circuit module 3 to supply power to the main circuit.

[0070] Specifically, when the airborne power supply module 1 is in an abnormal state, that is, when the airborne power supply module 1 loses power, the comparison circuit module 6 compares the input voltage of the airborne power supply module 1 with the reference voltage set by the comparison circuit module 6. When the input voltage is lower than the reference voltage, the comparison circuit module 6 controls the charging module 2 to charge the slow charge and fast discharge circuit module 3, and controls the slow charge and fast discharge circuit module 3 to supply power to the main circuit.

[0071] In practical applications, by adopting the switching method of the airborne power supply power-off maintenance switching circuit of this embodiment, compared with the prior art, this solution realizes that under the conditions of meeting the miniaturization requirements and light weight requirements of airborne equipment, it also improves the stability of the airborne power supply to maintain the power supply of the main circuit, and avoids the adverse effects on the main circuit caused by the too fast power-off of the airborne power supply. In addition, since the situation of abnormal power-off of the airborne power supply module 1 is a very short process, only the charging module 2 needs to provide power supply for a short time (about 50 ms). Therefore, the power of the charging module 2 does not need to be very large, and thus, the cost will also be saved.

[0072] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. An airborne power-off maintenance switching circuit, characterized in that, It includes a charging module (2), a slow charging and fast discharging circuit module (3), a switching circuit module (4), an auxiliary power supply module (5), and a comparison circuit module (6); The charging module (2) is electrically connected to the power supply characteristic unit and the slow charging and fast discharging circuit module (3) respectively, and is used to charge the slow charging and fast discharging circuit module (3); The slow charging and fast discharging circuit module (3) is electrically connected to the airborne power supply module (1), and is used to maintain the stability of the voltage of the airborne power supply module (1); The switching circuit module (4) is electrically connected to the comparison circuit module (6) and the slow charging and fast discharging circuit module (3) respectively. After receiving the signal sent by the comparison circuit module (6), it is used to control the slow charging and fast discharging circuit module (3) to supply power to the main circuit; The comparison circuit module (6) is electrically connected to the switching circuit module (4), the charging module (2), and the power supply characteristic unit respectively. After comparing the sampled power supply voltage of the power supply characteristic unit with the reference voltage designed by the comparison circuit module (6), it sends control signals to the switching circuit module (4) and the charging module (2) respectively, so as to realize that the comparison circuit module (6) controls the charging module (2) to charge the slow charging and fast discharging circuit module (3), and controls the slow charging and fast discharging circuit module (3) to supply power to the main circuit; The auxiliary power supply module (5) is electrically connected to the slow charging and fast discharging circuit module (3) and the comparison circuit module (6) respectively, and is used to supply power to the comparison circuit module (6).

2. The airborne power-off maintenance switching circuit according to claim 1, characterized in that The charging module (2) includes a filter (21) and a DC / dc converter (24); The input end of the filter (21) is connected to the power supply characteristic unit, and the output end of the filter (21) is connected to the input end of the DC / dc converter (24); The output end of the DC / dc converter (24) is connected to the slow charging and fast discharging circuit module (3).

3. The airborne power supply power-off maintenance switching circuit according to claim 2, wherein The slow charging and fast discharging circuit module (3) includes a first resistor (31), a polarized capacitor (32), a first diode (33), and a second resistor (34); The input end of the first resistor (31) is connected to the output end of the DC / dc converter (24), and the output end of the first resistor (31) is connected to the input end of the first diode (33); The input end of the second resistor (34) is connected to the output end of the first resistor (31), and the output end of the second resistor (34) is connected to the switching circuit module (4); The output end of the first diode (33) is connected to the airborne power supply module (1); The positive electrode of the polarized capacitor (32) is connected to the output end of the first resistor (31), and the negative electrode of the polarized capacitor (32) is connected to the switching circuit module (4).

4. The airborne power-off maintenance switching circuit according to claim 3, characterized in that, The switching circuit module (4) includes a first zener diode (41), a third resistor (42), a first nmos transistor (43), a fourth resistor (44), an optocoupler (45), a fifth resistor (46), a second zener diode (47), and a second nmos transistor (48); The input end of the fifth resistor (46) is connected to the comparison circuit module (6), and the output end of the fifth resistor (46) is connected to the input end of the optocoupler (45); The output end of the optocoupler (45) is connected to the input end of the fourth resistor (44); the output end of the fourth resistor (44) is connected to the gate of the first NMOS transistor (43); the source of the first NMOS transistor (43) is connected to the source of the second NMOS transistor (48); the drain of the second NMOS transistor (48) is connected to the negative pole of the polarized capacitor (32); The input end of the third resistor (42) is connected to the source of the first NMOS transistor (43), and the output end of the third resistor (42) is connected to the output end of the fourth resistor (44); The input end of the first voltage regulator diode (41) is connected to the output end of the optocoupler (45), and the output end of the first voltage regulator diode (41) is connected to the source of the first NMOS transistor (43); The input end of the second voltage regulator diode (47) is connected to the output end of the fourth resistor (44), and the output end of the second voltage regulator diode (47) is connected to the source of the second NMOS transistor (48).

5. The airborne power supply power failure maintenance switching circuit according to claim 4, characterized in that, The comparison circuit module (6) includes a first operational amplifier comparator (64), a second operational amplifier comparator (612), and a second triode (618); The inverting input end of the first operational amplifier comparator (64) is connected to the power supply characteristic unit, the non-inverting input end of the first operational amplifier comparator (64) is connected to the auxiliary power supply module (5), the output end of the first operational amplifier comparator (64) is connected to the input end of the fifth resistor (46), the positive pole of the first operational amplifier comparator (64) is connected to the reference voltage circuit, and the negative pole of the first operational amplifier comparator (64) is grounded; The non-inverting input end of the second operational amplifier comparator (612) is connected to the auxiliary power supply module (5), the inverting input end of the second operational amplifier comparator (612) is connected to the input end of the charging module (2), the output end of the second operational amplifier comparator (612) is connected to the base of the second triode (618), the positive pole of the second operational amplifier comparator (612) is connected to the reference voltage circuit, and the negative pole of the second operational amplifier comparator (612) is grounded; The collector of the second triode (618) sends a control signal to the switching circuit module (4) and the charging module (2), and the emitter of the second triode (618) is grounded.

6. The airborne power supply power-off maintenance switching circuit according to claim 5, characterized in that, The auxiliary power supply module (5) includes a sixth resistor (51), a seventh resistor (52), an eighth resistor (53), a third voltage regulator diode (54), a first triode (56), and a ninth resistor (510); The input end of the sixth resistor (51) is connected to the output end of the first diode (33), and the output end of the sixth resistor (51) is connected to the input end of the eighth resistor (53); The input end of the seventh resistor (52) is connected to the output end of the first diode (33), and the output end of the seventh resistor (52) is connected to the input end of the eighth resistor (53); The output terminal of the eighth resistor (53) is connected to the base of the first triode (56); The collector of the first triode (56) is connected to the output terminals of the sixth resistor (51) and the seventh resistor (52). The emitter of the first triode (56) is connected to the input terminal of the ninth resistor (510). The output terminal of the ninth resistor (510) is connected to the non-inverting input terminal of the first operational amplifier comparator (64); The input terminal of the third voltage regulator tube (54) is connected to the input terminal of the eighth resistor (53), and the output terminal of the third voltage regulator tube (54) is grounded.

7. A switching method for an airborne power supply power failure maintenance switching circuit, including the airborne power supply power failure maintenance switching circuit according to any one of claims 1-6, characterized in that, It includes the following steps: When the airborne power supply module (1) is in a normal state, the comparison circuit module (6) controls the charging module (2) to be cut off, and the airborne power supply module (1) supplies power normally; When the airborne power supply module (1) is in an abnormal state, the circuit of the power supply characteristic unit is switched to the charging module (2). The comparison circuit module (6) controls the charging module (2) to charge the slow charge and fast discharge circuit module (3), and controls the slow charge and fast discharge circuit module (3) to supply power to the main circuit.

8. The switching method of the airborne power supply power-off maintenance switching circuit according to claim 7, characterized in that, When the airborne power supply module (1) is in an abnormal state, the circuit of the power supply characteristic unit is switched to the charging module (2). The comparison circuit module (6) controls the charging module (2) to charge the slow charge and fast discharge circuit module (3), and controls the slow charge and fast discharge circuit module (3) to supply power to the main circuit, including: When the airborne power supply module (1) loses power, the comparison circuit module (6) compares the input voltage of the airborne power supply module (1) with the reference voltage set by the comparison circuit module (6). When the input voltage is lower than the reference voltage, the comparison circuit module (6) controls the charging module (2) to charge the slow charge and fast discharge circuit module (3), and controls the slow charge and fast discharge circuit module (3) to supply power to the main circuit.

Images