Rapid maintenance equipment for short wave transmitter power amplifier

Abstract

The utility model discloses rapid maintenance equipment for a short-wave transmitter power amplifier, and belongs to the technical field of short-wave transmitter power amplifier maintenance. The device comprises a hand-held rod, a maintenance assembly, a switching knob, a power line and a universal meter red-black connection line. A heating button is mounted on the handheld rod; the maintenance assembly comprises a positioning seat fixed at the bottom of the handheld rod, the bottom of the positioning seat is also provided with elastic telescopic rods which are in one-to-one correspondence with field-effect tube pins in number and position, and electric heating wires are arranged in the elastic telescopic rods; the switching knob is installed at the top of the handheld rod, and a power line connected with the outside and a universal meter red-black connecting line are installed on the switching knob. A plurality of pins of the field-effect tube are simultaneously contacted with the corresponding elastic telescopic rods, and are connected with a universal meter through pin leads and a switching knob to carry out rapid measurement; if the field-effect tube is found to be damaged through measurement, each pin can be immediately heated through the elastic telescopic rod, so that welding spots are melted, and the damaged field-effect tube is quickly disassembled.

Description

Technical Field

[0001] This utility model relates to a rapid repair device for shortwave transmitter power amplifiers, belonging to the field of shortwave transmitter power amplifier repair technology. Background Technology

[0002] The power amplifier (PA) of a shortwave transmitter is a crucial component of shortwave transmitting equipment. It is responsible for increasing the signal power to a sufficient level for transmission over long distances via the antenna. Shortwave communication is primarily used in military, aviation, marine, and long-range radio applications. Especially during natural disasters and emergencies, shortwave communication has become an important communication method due to its long range and high reliability.

[0003] The main structure of a shortwave transmitter power amplifier typically includes amplification circuits, a heat dissipation system, and protection circuits. The most crucial component is the field-effect transistor (FET). The primary function of the FET in a shortwave transmitter power amplifier is to amplify the power of the input signal. Compared to traditional bipolar transistors (BPTs), FETs have high input impedance and low noise characteristics, maintaining signal integrity and reducing noise interference. The high input impedance minimizes the FET's influence on the input signal, allowing for signal amplification without significant attenuation. Furthermore, FETs offer superior current control, making them suitable for handling the high power demands of shortwave transmitter power amplifiers.

[0004] One of the major causes of shortwave transmitter malfunctions is the failure of the field-effect transistor (FET). For example: 1. Overheating: Power amplifiers generate a large amount of heat when operating at high power. If the cooling system fails or is insufficient, the temperature may become too high, causing the FET to overheat and be damaged. 2. Overload or overcurrent: When the power amplifier's output power exceeds its design load or the current flowing through the circuit is too large, the device is prone to excessive power loss, causing the FET to burn out or break down. 3. Voltage surge: Power amplifiers have high requirements for input and output voltage. If the power supply voltage is unstable or there are sudden voltage fluctuations, it will surge the FET, leading to breakdown or damage. Therefore, in daily work, the maintenance of FETs is one of the important tasks in the maintenance of shortwave transmitter power amplifiers.

[0005] However, currently there are no specialized tools for repairing field-effect transistors (FETs), resulting in lengthy repair times and potential disruptions to the normal operation of shortwave transmitters. This is especially problematic in radio stations, where strict regulations and requirements govern repair time. Therefore, this paper proposes a rapid repair device for shortwave transmitter power amplifiers, capable of quickly performing the testing and repair of FETs in shortwave transmitter power amplifiers. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a rapid repair device for shortwave transmitter power amplifiers, which solves the problem that the current testing and repair of field-effect transistors of shortwave transmitter power amplifiers is relatively slow and there is no dedicated equipment.

[0007] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0008] A rapid troubleshooting device for a shortwave transmitter power amplifier includes a handheld lever, a troubleshooting assembly, a switching knob, a power cord, and a multimeter with red and black wires.

[0009] A heating button is installed on the handheld lever;

[0010] The maintenance assembly includes a positioning seat fixed to the bottom of the handheld lever. The bottom of the positioning seat is provided with multiple positioning baffles that precisely restrict the main body of the field-effect transistor. A suction cup is provided in the middle of the positioning baffles. The bottom of the positioning seat is also provided with an elastic telescopic rod that corresponds one-to-one with the number and position of the pins of the field-effect transistor. An electric heating wire is provided inside the elastic telescopic rod.

[0011] The switching knob is mounted on the top of the handheld lever. A power cord and a multimeter red / black connector are installed on the switching knob for external connection. One end of the power cord passes through the switching knob and is electrically connected to the heating element via the heating button on the handheld lever. The other end of the power cord has a plug. The input end of the switching knob is electrically connected to each elastic telescopic lever via multiple pin wires. The output end of the switching knob is electrically connected to the multimeter red / black connector. As the switching knob is switched, the GS, DS, and GD pins of the field-effect transistor are electrically connected to the multimeter red / black connector, respectively.

[0012] Preferably, the elastic telescopic rod includes a metal rod, a retaining ring, a spring, an upper hollow threaded cap, and a lower hollow threaded cap. The positioning seat has a vertical through hole, the upper end of which is closed by the upper hollow threaded cap. A retaining ring is provided on the upper part of the metal rod, and a spring is sleeved above the retaining ring. The metal rod is inserted into the through hole from below and passes through the upper hollow threaded cap. The upper and lower ends of the spring are restricted by the hollow threaded cap and the retaining ring. The lower hollow threaded cap, which restricts the downward movement of the retaining ring, is screwed into the lower end of the through hole.

[0013] Preferably, the metal rod is an iron rod that tapers to a pointed tip.

[0014] Preferably, the upper hollow threaded cap and the lower hollow threaded cap are made of insulating and heat-insulating ceramic hollow threaded caps.

[0015] Preferably, the bottom edge of the positioning baffle is provided with a guide slope to facilitate the sliding of the MOSFET body.

[0016] The beneficial effects of this utility model are: it can quickly fix the inspection component and the field-effect transistor to be tested, and the multiple pins of the field-effect transistor can simultaneously contact the corresponding elastic telescopic rods. It can be connected to a multimeter through pin wires and a switching knob. By switching the knob, G (gate), S (source), and D (drain) can be connected to the red and black wires of the multimeter respectively for rapid measurement. If the measurement finds that the field-effect transistor is damaged, the elastic telescopic rods can be used to heat each pin to melt the solder joints and quickly disassemble the damaged field-effect transistor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of a typical shortwave transmitter power amplifier circuit board;

[0019] Figure 3 This is a circuit connection diagram for the input and output terminals of the switching knob;

[0020] Figure 4 This is a schematic diagram of the internal structure of the component being inspected.

[0021] In the diagram: 1. Handheld lever; 101. Heating button; 2. Inspection component; 201. Positioning seat; 202. Positioning baffle; 203. Suction cup; 204. Through hole; 205. Guide slope; 3. Switch knob; 4. Power cord; 5. Red and black wires; 6. Elastic telescopic rod; 601. Heating wire; 602. Metal rod; 603. Snap ring; 604. Spring; 605. Upper hollow threaded cap; 606. Lower hollow threaded cap; 7. Multimeter; 8. Field effect transistor; 9. Shortwave transmitter power amplifier circuit board; 10. Pin wires. Detailed Implementation

[0022] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this utility model, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0023] like Figure 1 As shown, this rapid repair equipment for shortwave transmitter power amplifiers is specifically designed for the rapid testing and repair of the field-effect transistor 8 of shortwave transmitter power amplifiers.

[0024] It includes a handheld lever 1, a maintenance assembly 2, a switching knob 3, a power cord 4, and a multimeter 7 with red and black wires 5.

[0025] A heating button 101 is installed on the handheld lever 1. The heating button 101 is a self-rebound button that turns on the circuit when pressed and turns off the circuit when released.

[0026] The maintenance component 2 includes a positioning base 201 fixed to the bottom of the handheld lever 1. The positioning base 201 is made of iron. The bottom of the positioning base 201 has multiple positioning baffles 202 that precisely contain the main body of the field-effect transistor 8. The positioning baffles 202 surround the field-effect transistor 8 and are installed on the bottom of the positioning base 201 using adhesive or quick-release threaded fasteners. The positioning baffles 202 can be made of plastic. A suction cup 203 is located in the middle of the positioning baffles 202. The suction force of the suction cup 203 can lift the field-effect transistor 8 after the solder joints have melted. If the solder joints have not melted, they can be directly pulled off without affecting the stability of the solder joints. The bottom of the positioning base 201 also has a flexible telescopic rod 6 that corresponds one-to-one with the number and position of the pins of the field-effect transistor 8. An electric heating wire 601 is installed inside the flexible telescopic rod 6. The maximum temperature that the electric heating wire 601 can reach after heating the flexible telescopic rod 6 is 250℃. It is suitable for melting low-temperature solder paste (melting point temperature less than 160℃), medium-temperature solder paste (melting point temperature between 160-240℃), and some high-temperature solder paste (melting point temperature greater than 240℃ and less than 250℃).

[0027] This specialized equipment needs to be customized based on the known specifications (size, P / N channel, pinout) of the MOSFETs. This is to enable rapid detection and disassembly in the event of a shortwave transmitter power amplifier malfunction. MOSFETs of different specifications can be pre-customized, with the corresponding MOSFET model number clearly marked, and placed in the repair toolbox for later use. In applications such as broadcasting and military communications, where time constraints are extremely high, the ability to quickly complete repairs can significantly reduce losses.

[0028] like Figure 2 , Figure 3 The diagram shows a common shortwave transmitter power amplifier circuit board 9, in which a field-effect transistor 8 is drawn for power amplification. This type of field-effect transistor 8 has 5 pins: G (gate G1, G2), S (source), and D (drain D1, D2). Correspondingly, this troubleshooting assembly 2 is equipped with 5 flexible telescopic rods 6.

[0029] The switching knob 3 is installed on the top of the handheld lever 1. The switching knob 3 is equipped with a power cord 4 and a multimeter 7 red and black wire 5 for external connection. One end of the power cord 4 passes through the switching knob 3 and is electrically connected to the heating wire 601 through the heating button 101 on the handheld part. The other end of the power cord 4 is provided with a plug. The input end of the switching knob 3 is electrically connected to each elastic telescopic lever 6 through multiple pin wires 10 (G, S, D pin wires 10). The output end of the switching knob 3 is electrically connected to the multimeter 7 red and black wire 5. As the switching knob 3 switches between gears, the GS pin wire 10, DS pin wire 10, and GD pin wire 10 of the field effect transistor 8 are electrically connected to the multimeter 7 red and black wire 5 respectively. The pin wires 10 and power lines 4 are made of high-temperature resistant cables. Specifically, cables that can withstand temperatures above 260°C are used, including but not limited to: fluoroplastic insulated cables (resistant to approximately 260°C), mica insulated cables (resistant to approximately 300°C), and polyimide (PI) insulated cables (resistant to approximately 400°C).

[0030] like Figure 4 As shown, the elastic telescopic rod 6 includes a metal rod 602, a retaining ring 603, a spring 604, an upper hollow threaded cap 605, and a lower hollow threaded cap 606. The positioning seat 201 has a vertical through hole 204. The upper end of the through hole 204 is closed by the upper hollow threaded cap 605. A retaining ring 603 is provided on the upper part of the metal rod 602. The spring 604 is sleeved on the upper part of the retaining ring 603. The metal rod 602 is inserted into the through hole 204 from below and passes through the upper hollow threaded cap 605. The upper and lower ends of the spring 604 are restricted by the hollow threaded cap and the retaining ring 603. The lower end of the through hole 204 is screwed into the lower hollow threaded cap 606, which is used to restrict the downward movement of the retaining ring 603.

[0031] The metal rod 602 is an iron rod that tapers to a pointed tip. The tip facilitates the detection and heating of the 8 pins of the field-effect transistor.

[0032] The upper hollow threaded cap 605 and the lower hollow threaded cap 606 are made of insulating and heat-insulating ceramic hollow threaded caps. This prevents current and heat from being transferred to the positioning seat 201 through the metal rod 602.

[0033] The bottom inner side of the positioning baffle 202 is provided with a guide slope 205 to facilitate the sliding of the main body of the field-effect transistor 8. When inserting the field-effect transistor 8, there is a certain margin of error. If there is a small deviation in position, it can be guided into the positioning baffle 202 through the guide slope 205 to complete the positioning and adsorption.

[0034] Figure 3 The field-effect transistor 8 in the design consists of two field-effect transistors 8 connected in parallel, sharing a common source (S). Therefore, it has two gates G1 and G2, and two drains D1 and D2. During measurement, the functionality of each individual field-effect transistor 8 needs to be measured separately.

[0035] This rapid repair equipment is for Figure 2 , Figure 3 The steps for overhauling the field-effect transistor 8 of the shortwave transmitter power amplifier are as follows:

[0036] I. Testing of Field-Effect Transistor 8: The maintenance personnel place the positioning baffle 202 on the main body of the field-effect transistor 8, and quickly fix the maintenance component 2 to the field-effect transistor 8 to be tested using the suction cup 203. At this time, multiple pins of the field-effect transistor 8 simultaneously contact the corresponding elastic telescopic rods 6, and connect them to the multimeter 7 through the pin wires 10 and the switching knob 3. By continuously changing the range of the switching knob 3, the G (gate G1, G2), S (source), and D (drain D1, D2) of the field-effect transistor 8 are connected to the red and black terminals 5 of the multimeter 7 respectively for rapid measurement.

[0037] Set multimeter 7 to diode test mode and measure the resistance between the pins of MOSFET 8 to determine if MOSFET 8 is good or bad. The red and black probes of multimeter 7 are connected in the red-black wiring configuration of this solution.

[0038] Figure 3 In this embodiment, two N-channel field-effect transistors 8 are used. The wiring and judgment criteria for the three pins of one of the field-effect transistors 8 (gate G1, source S, and drain D1) are as follows (the measurement process for the other field-effect transistor 8 is similar):

[0039] (1) Drain-source resistance (D1-S without voltage):

[0040] Connect the black probe to the source (S) and the red probe to the drain (D1).

[0041] When there is no gate voltage, it should display as infinity, and the FET is not conducting.

[0042] If the resistance is too low, the FET may short-circuit and be damaged.

[0043] (2) Gate-source resistance (G1-S):

[0044] The black probe is connected to the source (S), and the red probe is connected to the gate (G1).

[0045] It should be displayed as infinity, and the gate and source should be insulated; otherwise, it will be damaged.

[0046] (3) Gate-drain resistance (G1-D1):

[0047] Connect the black probe to the drain (D1) and the red probe to the gate (G1).

[0048] It should be displayed as infinity, and the grid drain should be insulated; otherwise, it will be damaged.

[0049] (4) Continuity test (D1-S pressure):

[0050] Connect the black probe to the source (S) and the red probe to the drain (D1).

[0051] When a positive gate voltage is applied, the drain-source resistance should decrease significantly, indicating that the FET is conducting; otherwise, it will be damaged.

[0052] Conclusion:

[0053] Normal: The drain-source resistance is infinite when there is no gate, the gate-source and gate-drain resistances are infinite, and the circuit is turned on under the gate voltage drive.

[0054] Damage: The drain-source resistance is too low or the gate-source resistance is too small, or the FET is short-circuited or leaking.

[0055] During the above tests, the G (gate), S (source), and D (drain) pin wires 10 of each field-effect transistor 8 are connected to the red and black terminals 5 of the multimeter 7 by switching knob 3. The connection combination for each test step is fixed to one range (e.g., Figure 1 In addition to the 0 neutral position, the switching knob 3 also has 8 positions for the two parallel N-channel MOSFETs 8: G1-S, D1-S un-energized, D1-S-energized, G1-D1, G2-S, D2-S un-energized, D2-S-energized, and G2-D2. By rotating to different positions, the resistance between different pins can be measured, thereby enabling the detection of the MOSFETs 8.

[0056] II. Disassembly of MOSFET 8: If the MOSFET 8 is found to be damaged, first remove the mounting screws of the MOSFET 8 using a screwdriver. Then press the heating button 101 on the handheld lever 1. The heating wire 601 is energized to heat the elastic telescopic lever 6. The tip of the elastic telescopic lever 6 melts the solder on each pin of the MOSFET 8. Then, the MOSFET 8 can be pulled out using the built-in suction cup 203, quickly completing the disassembly.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid troubleshooting device for a shortwave transmitter power amplifier, characterized in that, It includes a handheld lever, inspection components, a switching knob, a power cord, and a multimeter red and black connector; A heating button is installed on the handheld lever; The maintenance assembly includes a positioning seat fixed to the bottom of the handheld lever. The bottom of the positioning seat is provided with multiple positioning baffles that precisely restrict the main body of the field-effect transistor. A suction cup is provided in the middle of the positioning baffles. The bottom of the positioning seat is also provided with an elastic telescopic rod that corresponds one-to-one with the number and position of the pins of the field-effect transistor. An electric heating wire is provided inside the elastic telescopic rod. The switching knob is mounted on the top of the handheld lever. A power cord and a multimeter red / black connector are installed on the switching knob for external connection. One end of the power cord passes through the switching knob and is electrically connected to the heating element via the heating button on the handheld lever. The other end of the power cord has a plug. The input end of the switching knob is electrically connected to each elastic telescopic lever via multiple pin wires. The output end of the switching knob is electrically connected to the multimeter red / black connector. As the switching knob is switched, the GS, DS, and GD pins of the field-effect transistor are electrically connected to the multimeter red / black connector, respectively.

2. The rapid repair equipment for a shortwave transmitter power amplifier according to claim 1, characterized in that, The elastic telescopic rod includes a metal rod, a retaining ring, a spring, an upper hollow threaded cap, and a lower hollow threaded cap. The positioning seat has a vertical through hole, the upper end of which is closed by the upper hollow threaded cap. A retaining ring is provided on the upper part of the metal rod, and a spring is sleeved above the retaining ring. The metal rod is inserted into the through hole from below and passes through the upper hollow threaded cap. The upper and lower ends of the spring are restricted by the hollow threaded cap and the retaining ring. The lower hollow threaded cap, which restricts the downward movement of the retaining ring, is screwed into the lower end of the through hole.

3. The rapid repair equipment for a shortwave transmitter power amplifier according to claim 2, characterized in that, The metal rod is made of iron that tapers to a pointed tip at the bottom.

4. The rapid repair equipment for a shortwave transmitter power amplifier according to claim 2, characterized in that, The upper and lower hollow threaded caps are made of insulating and heat-insulating ceramic hollow threaded caps.

5. The rapid repair equipment for a shortwave transmitter power amplifier according to claim 1, characterized in that, The bottom inner side of the positioning baffle is provided with a guide slope to facilitate the sliding of the MOSFET body.

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