Fault self-detection DC-DC converter

Abstract

The invention discloses a fault self-checking DC-DC converter in the technical field of power supply control, which comprises a shell and a sealing cover, an automatic switching mechanism and a high-voltage emergency processing mechanism are arranged in an inner cavity of the shell, the high-voltage emergency processing mechanism comprises a first electromagnet, a second electromagnet and a lever, the second electromagnet is arranged on the side of the first electromagnet, and the lever is arranged on the side of the second electromagnet. According to the invention, through the arrangement of the high-voltage emergency processing mechanism, the high-voltage emergency processing mechanism works to introduce high voltage into a circuit with larger resistance when the DC-DC converter works and causes unstable voltage or overhigh boost, so that the DC-DC converter is prevented from being damaged by sudden failure, and the safety of the DC-DC converter is improved. According to the utility model, sudden high voltage does not break down and burn out circuit equipment, circuit components are protected, and meanwhile, the first voltage detector detects that the voltage is too high and sends a signal to a user to overhaul the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of power supply control, in particular to a DC-DC converter with fault self-detection. Background Art

[0002] A DC-DC converter is a device that converts a DC power supply into a DC power supply of a different voltage. It is widely used in various electronic devices. Its working principle is based on a switching power supply chip. It uses the energy storage characteristics of capacitors and inductors to perform high-frequency switching actions through a controllable switch (such as MOSFET) to store the input electrical energy in the capacitor or inductor. When the switch is disconnected, the electrical energy is released to the load to provide energy.

[0003] Long-term market research has found that many customers currently use high-voltage modules with DC12V power input. Some customers' devices do not have a DC12V interface but only a DC5V interface, so they need to add a DC12V module to the original equipment, which will increase the cost of the product. In order to reduce the customer's cost of use and enhance the reliability of the equipment, a high-voltage power module that can use both DC5V and DC12V interfaces and can provide emergency protection circuits in the event of a fault is now needed.

[0004] Based on this, the present invention designs a fault self-detecting DC-DC converter to solve the above problem. Summary of the invention

[0005] The purpose of the present invention is to provide a DC-DC converter with fault self-detection to solve the problem of a high-voltage power supply module that can use DC5V and DC12V interfaces at the same time and can provide emergency protection circuits when a fault occurs, as proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a DC-DC converter with fault self-detection, comprising a shell and a sealing cover, the inner cavity of the shell is provided with an automatic switching mechanism and a high-voltage emergency processing mechanism, the high-voltage emergency processing device comprises a No. 1 electromagnet, a No. 2 electromagnet, and a lever, a No. 2 electromagnet is provided on the side of the No. 1 electromagnet, a lever is provided between the No. 1 electromagnet and the No. 2 electromagnet, and a sealing cover is fixedly installed on the side wall of the shell.

[0007] Preferably, a No. 1 coil is installed on the outer wall of the No. 1 electromagnet, a No. 1 fixing seat is arranged on the periphery of the No. 1 electromagnet, the No. 1 electromagnet is fixedly installed on the No. 1 fixing seat, a high-voltage contact mounting seat is fixedly installed on the upper wall of the No. 1 fixing seat, a support block is installed on the upper wall of the No. 1 fixing seat, the support block is fixedly installed on the inner wall of the inner cavity of the shell, a movable contact is arranged above the No. 1 electromagnet, a contact mounting seat is fixedly installed on the upper wall of the support block, a contact is fixedly installed on the bottom of the contact mounting seat, a high-voltage contact is fixedly installed on the upper wall of the high-voltage contact mounting seat, the high-voltage contact is connected to one end of the No. 1 coil, and the other end of the No. 1 coil is connected There is a resistor, the other end of the resistor is connected to the output pin, a No. 3 fixing seat is arranged on the side of the No. 1 electromagnet, the No. 3 fixing seat is fixedly installed on the inner wall of the inner cavity of the shell, a No. 2 electromagnet is arranged on the upper wall of the No. 3 fixing seat, a No. 2 coil is installed on the outer wall of the No. 2 electromagnet, the contact is connected to one end of the No. 2 coil, the other end of the No. 2 coil is connected to the output pin, a support column is arranged above the No. 2 electromagnet, the support column is fixedly installed on the inner wall of the inner cavity of the shell, a lever is rotatably installed on the front end of the support column, a No. 1 permanent magnet is fixedly installed on one end of the lever close to the No. 2 electromagnet, and a No. 1 voltage detector is arranged between the output pins.

[0008] Preferably, the automatic switching mechanism includes a No. 3 electromagnet and a support rod, a No. 3 coil is provided on the outer wall of the No. 3 electromagnet, a No. 2 fixing seat is provided on the periphery of the No. 3 electromagnet, the No. 3 electromagnet is fixedly installed on the upper wall of the No. 2 fixing seat, the No. 2 fixing seat is fixedly installed in the inner cavity of the shell, a battery is fixedly installed on the side of the No. 2 fixing seat, a support rod is provided above the No. 3 electromagnet, a No. 2 support column is provided at one end of the support rod, the No. 2 support column is fixedly installed in the inner cavity of the shell, a No. 2 permanent magnet is fixedly installed in the middle of the support rod, a conductive contact is provided on the top of the support rod, a low voltage interface is fixedly installed above the conductive contact, and a high voltage interface is fixedly installed below the conductive contact.

[0009] Preferably, two fixing holes are provided on the contact mounting seat, two fixing blocks are provided on the upper wall of the support block, the fixing blocks cooperate with the fixing holes, a fixing rod is provided on the side wall of the high-voltage contact mounting seat, a fixing opening is provided on the bottom side wall of the support block, the fixing rod cooperates with the fixing opening, a groove is provided at the lower part of the support block, a fixing strip is provided on the upper wall of the groove, and the groove cooperates with the high-voltage contact mounting seat.

[0010] Preferably, the movable contact is arranged in two sections, the two sections of the movable contact are connected by a hinge, the upper arm of the movable contact is provided with two mounting caps, a rubber band is arranged between the two mounting caps, a wire is arranged in the inner cavity of the movable contact, and the wire is arranged in an S shape.

[0011] Preferably, limiting rings are provided at both ends of the No. 2 electromagnet, a limiting groove is provided on the inner wall of the No. 3 fixing seat, the limiting rings cooperate with the limiting grooves, a limiting block is fixedly installed at the front end of the support column, and a mounting ring is rotatably fixedly installed at the top of the support column.

[0012] Preferably, a partition is provided in the middle of the No. 2 fixing seat, and the partition is provided with two wire holes, and the two ends of the No. 3 coil pass through the wire holes to be fixedly connected to the positive and negative poles of the battery.

[0013] Preferably, the upper wall of the high voltage interface is provided with silver-plated contacts, the lower wall of the low voltage interface is provided with silver-plated contacts, an input pin is provided above the support rod, a No. 2 voltage detector is provided behind the input pin, and the input pin is provided with a connecting wire connected to the conductive contact.

[0014] Preferably, the side wall of the housing is provided with a sealing ring, and the sealing ring cooperates with the sealing cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention sets up a high-voltage emergency processing mechanism. When a sudden fault occurs during the operation of the DC-DC converter, resulting in unstable voltage or excessive voltage boost, the high-voltage emergency processing mechanism works and introduces high voltage into the circuit with a larger resistance, so that the sudden high voltage will not break down and burn the circuit equipment, thereby protecting the circuit components. At the same time, the No. 1 voltage detector detects that the voltage is too high and sends a signal to the user to repair the equipment.

[0017] 2. The present invention is provided with an automatic switching mechanism. When the input terminal is connected, the connected voltage is detected by the No. 2 voltage detector. When it is detected that the voltage is suitable for use with the DC5V module, the No. 2 voltage detector allows the battery to send a signal, the battery starts working, and the interface is connected to the low voltage interface. If it is detected that the voltage is suitable for use with the DC12V module, the interface is connected to the high voltage interface to achieve automatic switching, which has higher practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the internal viewing angle structure of the present invention;

[0020] Figure 2This is a schematic diagram of the main viewing angle structure of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the high-voltage emergency treatment mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the automatic switching mechanism of the present invention;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the present invention from a top view;

[0025] Figure 7 It is a schematic cross-sectional structure diagram of the high-voltage emergency treatment mechanism of the present invention;

[0026] Figure 8 It is a schematic cross-sectional structure diagram of the high-voltage emergency treatment mechanism of the present invention;

[0027] Fig. 9 For the present invention Figure 8 A in the middle is an enlarged view of the structure;

[0028] Fig.10 It is the principle of the self-excited push-pull circuit of the present invention;

[0029] Fig.11 Single-ended flyback voltage and current waveforms.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1-housing, 2-input pin, 3-sealing cover, 4-output pin, 5-contact, 6-moving contact, 7-high voltage contact, 8-No. 1 electromagnet, 9-No. 1 coil, 10-No. 1 fixing seat, 11-resistance, 12-No. 1 voltage detector, 13-No. 2 coil, 14-No. 2 electromagnet, 15-limiting ring, 16-limiting groove, 17-No. 1 permanent magnet, 18-lever, 19-No. 2 voltage detector, 20-low voltage interface, 21-support rod, 22-battery, 23-No. 3 electromagnet, 24-No. 3 coil, 25-No. 2 permanent magnet, 26-No. 2 fixing seat, 27-silver-plated contact, 28-high voltage interface, 29-mounting ring, 30-limiting block, 31-support column, 32-mounting cap, 33-rubber band, 34-high voltage contact mounting seat, 35-fixing block, 36-fixing hole, 38-sealing ring, 39-wire, 40-hinge, 41-fixing strip, 42-support block, 43-fixing rod, 44-fixing mouth, 45-connecting wire, 46-wire hole, 47-conductive contact, 48-No. 3 fixing seat, 49-contact mounting seat. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Please see attached Figure 1 The present invention provides a technical solution: a DC-DC converter with fault self-detection, comprising a shell 1 and a sealing cover 3, the inner cavity of the shell 1 is provided with an automatic switching mechanism and a high-voltage emergency processing mechanism, the high-voltage emergency processing device comprises a No. 1 electromagnet 8, a No. 2 electromagnet 14, and a lever 18, the No. 2 electromagnet 14 is arranged on the side of the No. 1 electromagnet 8, the lever 18 is arranged between the No. 1 electromagnet 8 and the No. 2 electromagnet 14, and the sealing cover 3 is fixedly installed on the side wall of the shell 1.

[0034] Please see attached Figure 1 , Attachment Figure 3 and attached Figure 6 A coil No. 9 is installed on the outer wall of the No. 1 electromagnet 8, a fixing seat No. 10 is arranged on the periphery of the No. 1 electromagnet 8, the No. 1 electromagnet 8 is fixedly installed on the fixing seat No. 10, a high-voltage contact mounting seat 34 is fixedly installed on the upper wall of the No. 1 fixing seat 10, a support block 42 is installed on the upper wall of the No. 1 fixing seat 10, the support block 42 is fixedly installed on the inner wall of the inner cavity of the shell 1, a movable contact 6 is arranged above the No. 1 electromagnet 8, a contact mounting seat 49 is fixedly installed on the upper wall of the support block 42, a contact 5 is fixedly installed on the bottom of the contact mounting seat 49, a high-voltage contact 7 is fixedly installed on the upper wall of the high-voltage contact mounting seat 34, the high-voltage contact 7 is connected to one end of the No. 1 coil 9, the other end of the No. 1 coil 9 is connected to a resistor 11, and the other end of the resistor 11 is connected to the output pin 4, a No. 3 fixing seat 48 is arranged on the side of the No. 1 electromagnet 8, and the No. 3 fixing seat 48 is fixed It is installed on the inner wall of the inner cavity of the shell 1, and a No. 2 electromagnet 14 is arranged on the upper wall of the No. 3 fixing seat 48, and a No. 2 coil 13 is installed on the outer wall of the No. 2 electromagnet 14. The contact 5 is connected to one end of the No. 2 coil 13, and the other end of the No. 2 coil 13 is connected to the output pin 4. A support column 31 is arranged above the No. 2 electromagnet 14, and the support column 31 is fixedly installed on the inner wall of the inner cavity of the shell 1. A lever 18 is rotatably installed at the front end of the support column 31, and a No. 1 permanent magnet 17 is fixedly installed at one end of the lever 18 close to the No. 2 electromagnet 14. A No. 1 voltage detector 12 is arranged between the output pins 4. Through the arranged electromagnet, when the voltage is too large, the No. 2 electromagnet 14 generates magnetic force, so that it generates a repulsive force with the No. 1 permanent magnet 17, thereby pushing the moving contact 6 to move, so that it is connected to a circuit with a higher resistance 11, so as to protect the components.

[0035] Please see attached Figure 1 , Attachment Figure 4and attached Figure 5 The automatic switching mechanism includes a No. 3 electromagnet 23 and a support rod 21. The outer wall of the No. 3 electromagnet 23 is provided with a No. 3 coil 24. The outer periphery of the No. 3 electromagnet 23 is provided with a No. 2 fixing seat 26. The No. 3 electromagnet 23 is fixedly mounted on the upper wall of the No. 2 fixing seat 26. The No. 2 fixing seat 26 is fixedly mounted in the inner cavity of the shell 1. A battery 22 is fixedly mounted on the side of the No. 2 fixing seat 26. A support rod 21 is arranged above the No. 3 electromagnet 23. A No. 2 supporting column is arranged at one end of the support rod 21. The No. 2 supporting column is fixedly mounted in the inner cavity of the shell 1. The support rod 21 A No. 2 permanent magnet 25 is fixedly installed in the middle, a conductive contact 47 is set at the top of the support rod 21, a low voltage interface 20 is fixedly installed above the conductive contact 47, and a high voltage interface 28 is fixedly installed below the conductive contact 47. The input voltage is detected by the No. 2 voltage detector 19, and the detection result is sent to the battery 22. The battery 22 adjusts the current direction according to the detection result, so that the No. 3 electromagnet 23 produces different magnetic poles, thereby realizing the attraction and repulsion control of the No. 2 permanent magnet 25 and realizing automatic switching of the interface.

[0036] Please see attached Figure 1-9 The contact mounting seat 49 is provided with two fixing holes 36, the upper wall of the support block 42 is provided with two fixing blocks 35, the fixing blocks 35 cooperate with the fixing holes 36, the side wall of the high-voltage contact mounting seat 34 is provided with a fixing rod 43, the bottom side wall of the support block 42 is provided with a fixing opening 44, the fixing rod 43 cooperates with the fixing opening 44, the lower part of the support block 42 is provided with a groove, the upper wall of the groove is provided with a fixing strip 41, the groove cooperates with the high-voltage contact mounting seat 34, the movable contact 6 is provided with two sections, and the two sections of the movable contact 6 are connected by hinges 40, two mounting caps 32 are arranged on the upper arm of the moving contact 6, a rubber band 33 is arranged between the two mounting caps 32, a wire 39 is arranged in the inner cavity of the moving contact 6, and the wire 39 is arranged in an S shape, limiting rings 15 are arranged at both ends of the No. 2 electromagnet 14, and a limiting groove 16 is arranged on the inner wall of the No. 3 fixing seat 48, and the limiting ring 15 and the limiting groove 16 cooperate with each other, a limiting block 30 is fixedly installed at the front end of the support column 31, and a mounting ring 29 is rotatably fixedly installed at the top of the support column 31.

[0037] Please see attached Figure 1 , Attachment Figure 3 Attached Figure 4 and attached Figure 5 A partition is provided in the middle of the No. 2 fixing seat 26, and the partition has two wire holes 46. Both ends of the No. 3 coil 24 pass through the wire holes 46 to be fixedly connected to the positive and negative poles of the battery 22. A silver-plated contact 27 is provided on the upper wall of the high voltage interface 28, and a silver-plated contact 27 is provided on the lower wall of the low voltage interface 20. An input pin 2 is provided above the support rod 21, and a No. 2 voltage detector 19 is provided behind the input pin 2. The input pin 2 is provided with a connecting wire 45 connected to the conductive contact 47.

[0038] Please see attached Figure 6 A sealing ring 38 is provided on the side wall of the housing 1, and the sealing ring 38 cooperates with the sealing cover 3. Through the cooperation between the sealing cover 3 and the sealing ring 38, the sealing cover 3 is installed more firmly and has better sealing performance.

[0039] Example 1

[0040] A specific application of this embodiment is: when the present invention is used, Fig.10 The circuit principle of this device is as follows: Fig.11 This is the waveform diagram of the single-ended flyback voltage and current of the device. First, the device is installed. When in use, a sudden fault occurs and the input voltage is too high. At this time, the voltage is too high through the No. 1 voltage detector 12, and a signal is sent to the user. At the same time, because the output voltage is too high, the magnetic force generated by the No. 2 electromagnet 14 is enhanced. The magnetic force generated by the No. 2 electromagnet 14 is enhanced and the mutual repulsion force generated by the No. 1 permanent magnet 17 arranged above the No. 2 electromagnet 14 is enhanced, so that the No. 1 permanent magnet 17 moves upward. The upward movement of the No. 1 permanent magnet 17 drives the lever 18 to move, so that the other end of the lever 18 moves downward. The other end of the lever 18 moves downward to push the moving contact 6 to move downward, so that the moving contact 6 is disconnected from the contact 5 and connected to the high-voltage contact 7. When the movable contact 6 moves downward, the rubber band 33 is pulled to stretch. At this time, the movable contact 6 is connected with the high-voltage contact 7, so that the No. 1 electromagnet 8 generates magnetic force. The No. 1 electromagnet 8 generates magnetic force and generates attraction with the movable contact 6, so that the movable contact 6 will not rebound. After being connected to the high-voltage contact 7, the circuit is provided with a resistor 11, so that the incoming high-voltage current is reduced in voltage, and the components are provided with emergency protection so that they will not be burned under the sudden high-voltage electricity. When the user receives the information that the voltage is too high, the power supply is disconnected, the No. 1 electromagnet 8 loses its magnetic force, and the rubber band 33 contracts, so that the movable contact 6 is reset. Then the staff inspects the device. Through the device, the equipment components are protected in the event of a sudden failure, the loss is reduced, and the device has good usability.

[0041] Example 2

[0042] A specific application of this embodiment is: when the present invention is in use, the power supply is connected to the input pin 2, and then the power supply enters the interior through the input pin 2, and the input voltage is detected by the No. 2 voltage detector 19. If the detected voltage size meets the voltage used by DC5V, the No. 2 voltage detector 19 sends a signal to the battery 22, and the battery 22 starts after receiving the signal, so that the No. 3 electromagnet 23 generates a magnetic force. Since the No. 3 electromagnet 23 generates a magnetic force, it generates an interaction force with the No. 2 permanent magnet 25 set above the No. 3 electromagnet 23, so that the No. 2 permanent magnet 25 moves upward, and the No. 2 permanent magnet 25 moves upward to drive the support rod 21 to rotate upward. The support rod 21 rotates upward to make the conductive contact 47 set on the top of the support rod 21 move upward, and the conductive contact 47 moves to It moves up and connects with the low voltage interface 20. If the detected voltage size meets the voltage used by DC12V, the No. 2 voltage detector 19 sends a signal to the electromagnet 22. After the battery receives the signal, it generates an opposite current, so that the No. 3 electromagnet 23 generates opposite magnetic poles, which attract each other with the No. 2 permanent magnet 25, so that the No. 2 permanent magnet 25 moves downward. The No. 2 permanent magnet 25 moves downward and drives the support rod 21 to rotate downward. The support rod 21 rotates downward to move the conductive contact 47 downward. The conductive contact 47 moves downward to connect with the high voltage interface 28. The No. 2 voltage detector 19 is set to detect the voltage size. By sending different signals to the battery 22, the direction of the current is controlled, so that the interface connection can be automatically switched. It has good usability and can avoid sudden failures during use. Fig.10 The circuit principle of this device is as follows: Fig.11 The waveform diagram of the single-ended flyback voltage and current of the device is as follows. The input voltage is too high. At this time, the voltage is detected to be too high by the No. 1 voltage detector 12, and a signal is sent to the user. At the same time, because the output voltage is too high, the magnetic force generated by the No. 2 electromagnet 14 is enhanced. The magnetic force generated by the No. 2 electromagnet 14 is enhanced and the mutual repulsion force generated by the No. 1 permanent magnet 17 arranged above the No. 2 electromagnet 14 is enhanced, so that the No. 1 permanent magnet 17 moves upward. The upward movement of the No. 1 permanent magnet 17 drives the lever 18 to move, so that the other end of the lever 18 moves downward. The downward movement of the other end of the lever 18 pushes the moving contact 6 to move downward, so that the moving contact 6 is disconnected from the contact 5, and the connection When the movable contact 6 is connected to the high-voltage contact 7 and moves downward, the rubber band 33 is pulled to stretch. At this time, the movable contact 6 is connected to the high-voltage contact 7, so that the No. 1 electromagnet 8 generates magnetic force. The No. 1 electromagnet 8 generates magnetic force and generates attraction with the movable contact 6, so that the movable contact 6 will not rebound. After being connected to the high-voltage contact 7, the circuit is provided with a resistor 11, so that the incoming high-voltage current is reduced in voltage, and the components are protected in an emergency so that they will not be burned under sudden high-voltage electricity. When the user receives the information that the voltage is too high, the power supply is disconnected, the No. 1 electromagnet 8 loses its magnetic force, and the rubber band 33 contracts, so that the movable contact 6 is reset. Then the staff inspects the device.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A DC-DC converter with fault self-detection, comprising a housing (1) and a sealing cover (3), characterized in that: The inner cavity of the shell (1) is provided with an automatic switching mechanism and a high-voltage emergency processing mechanism. The high-voltage emergency processing device comprises a first electromagnet (8), a second electromagnet (14), and a lever (18). The second electromagnet (14) is arranged on the side of the first electromagnet (8). The lever (18) is arranged between the first electromagnet (8) and the second electromagnet (14). A sealing cover (3) is fixedly mounted on the side wall of the shell (1).

2. A DC-DC converter with fault self-detection according to claim 1, characterized in that: The outer wall of the No. 1 electromagnet (8) is mounted with a No. 1 coil (9); the outer periphery of the No. 1 electromagnet (8) is provided with a No. 1 fixing seat (10); the No. 1 electromagnet (8) is fixedly mounted on the No. 1 fixing seat (10); the upper wall of the No. 1 fixing seat (10) is fixedly mounted with a high-voltage contact mounting seat (34); the upper wall of the No. 1 fixing seat (10) is mounted with a support block (42); the support block (42) is fixedly mounted on the inner wall of the inner cavity of the housing (1); a movable contact (6) is arranged above the No. 1 electromagnet (8); the upper wall of the support block (42) is fixedly mounted with a contact mounting seat (49); the bottom of the contact mounting seat (49) is fixedly mounted with a contact (5); the upper wall of the high-voltage contact mounting seat (34) is fixedly mounted with a high-voltage contact (7); the high-voltage contact (7) is connected to one end of the No. 1 coil (9); the other end of the No. 1 coil (9) is connected to a resistor (11); The other end of the resistor (11) is connected to the output pin (4); a third fixing seat (48) is arranged on the side of the first electromagnet (8); the third fixing seat (48) is fixedly mounted on the inner wall of the inner cavity of the shell (1); a second electromagnet (14) is arranged on the upper wall of the third fixing seat (48); a second coil (13) is mounted on the outer wall of the second electromagnet (14); the contact (5) is connected to one end of the second coil (13); the other end of the second coil (13) is connected to the output pin (4); a support column (31) is arranged above the second electromagnet (14); the support column (31) is fixedly mounted on the inner wall of the inner cavity of the shell (1); a lever (18) is rotatably mounted on the front end of the support column (31); a first permanent magnet (17) is fixedly mounted on one end of the lever (18) close to the second electromagnet (14); and a first voltage detector (12) is arranged between the output pins (4).

3. A DC-DC converter with fault self-detection according to claim 1, characterized in that: The automatic switching mechanism comprises a No. 3 electromagnet (23) and a support rod (21); a No. 3 coil (24) is arranged on the outer wall of the No. 3 electromagnet (23); a No. 2 fixing seat (26) is arranged on the periphery of the No. 3 electromagnet (23); the No. 3 electromagnet (23) is fixedly mounted on the upper wall of the No. 2 fixing seat (26); the No. 2 fixing seat (26) is fixedly mounted on the inner cavity of the housing (1); a battery (22) is fixedly mounted on the side of the No. 2 fixing seat (26); the No. 3 electromagnet (23) is fixedly mounted on the upper wall of the No. 2 fixing seat (26); the No. 2 fixing seat (26) is fixedly mounted on the inner cavity of the housing (1); a battery (22) is fixedly mounted on the side of the No. 3 fixing seat (26); A support rod (21) is arranged above the electromagnet (23), a second support column is arranged at one end of the support rod (21), the second support column is fixedly installed in the inner cavity of the shell (1), a second permanent magnet (25) is fixedly installed in the middle of the support rod (21), a conductive contact (47) is arranged at the top of the support rod (21), a low voltage interface (20) is fixedly installed above the conductive contact (47), and a high voltage interface (28) is fixedly installed below the conductive contact (47).

4. A DC-DC converter with fault self-detection according to claim 2, characterized in that: The contact mounting seat (49) is provided with two fixing holes (36), the upper wall of the support block (42) is provided with two fixing blocks (35), the fixing blocks (35) and the fixing holes (36) cooperate with each other, the side wall of the high-voltage contact mounting seat (34) is provided with a fixing rod (43), the bottom side wall of the support block (42) is provided with a fixing opening (44), the fixing rod (43) and the fixing opening (44) cooperate with each other, the lower part of the support block (42) is provided with a groove, the upper wall of the groove is provided with a fixing strip (41), and the groove cooperates with the high-voltage contact mounting seat (34).

5. A DC-DC converter with fault self-detection according to claim 2, characterized in that: The moving contact (6) is arranged in two sections, the two sections of the moving contact (6) are connected via a hinge (40), the upper arm of the moving contact (6) is provided with two mounting caps (32), a rubber band (33) is arranged between the two mounting caps (32), a wire (39) is arranged in the inner cavity of the moving contact (6), and the wire (39) is arranged in an S shape.

6. A DC-DC converter with fault self-detection according to claim 2, characterized in that: Limiting rings (15) are arranged at both ends of the second electromagnet (14), a limiting groove (16) is provided on the inner wall of the third fixing seat (48), the limiting ring (15) and the limiting groove (16) cooperate with each other, a limiting block (30) is fixedly installed at the front end of the support column (31), and a mounting ring (29) is rotatably fixedly installed at the top end of the support column (31).

7. A DC-DC converter with fault self-detection according to claim 3, characterized in that: A partition is provided in the middle of the No. 2 fixing seat (26), and the partition is provided with two wire holes (46). Both ends of the No. 3 coil (24) pass through the wire holes (46) to be fixedly connected to the positive and negative electrodes of the battery (22).

8. A DC-DC converter with fault self-detection according to claim 3, characterized in that: The upper wall of the high voltage interface (28) is provided with a silver-plated contact (27), the lower wall of the low voltage interface (20) is provided with a silver-plated contact (27), an input pin (2) is provided above the support rod (21), a No. 2 voltage detector (19) is provided behind the input pin (2), and the input pin (2) is provided with a connecting wire (45) connected to the conductive contact (47).

9. A DC-DC converter with fault self-detection according to claim 1, characterized in that: A sealing ring (38) is provided on the side wall of the housing (1), and the sealing ring (38) cooperates with the sealing cover (3).

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