Discharge device for switching power supply

Abstract

The utility model discloses a discharging device for switching power supply relates to the field of discharging tool. The discharging device includes PCB circuit board, and PCB circuit board is equipped with discharging circuit, and discharging circuit contains cement resistance R1 and the indicating lamp circuit parallelly connected with it, and the indicating lamp circuit includes the resistance R2 and emitting diode D1 of series connection, and PCB circuit board is equipped with two soldering points electric connection cement resistance R1 both ends, and two bendable probes are fixed with the one-to-one welding of soldering point, and the device still contains insulating outer cladding, and the probe outer end leads out, and the outer cladding reservation avoids the avoiding mouth of emitting diode D1. The device passes through cement resistance steady discharging, and the insulating outer cladding prevents electric shock, and the security is high, and the indicating lamp can directly judge the discharging state, and the bendable probe adapts different pin spacing energy storage element, and the versatility is strong, and the structure is stable and reliable, and the low safety, the state difficult judgment and the poor versatility of existing discharging mode are solved.

Description

Technical Field

[0001] This utility model relates to discharge tools, specifically to a discharge device for a switching power supply. Background Technology

[0002] During the research and development and debugging phase, high-frequency switching power supplies require frequent power-on and power-off operations. When the mains power is input, after the high-frequency switching power supply is turned on and then turned off, the voltage across the positive and negative terminals of the high-voltage capacitor can reach about 300V. If this high voltage cannot be released quickly, it can easily damage the components on the circuit board during subsequent debugging, and there is also a risk of electric shock, or even life-threatening danger to the human body.

[0003] The discharge methods commonly used by researchers on the market have obvious drawbacks: First, using metal tweezers to short-circuit the positive and negative terminals of a high-voltage capacitor for discharge, although the discharge speed is fast, will produce an explosive sound and violent sparks when short-circuited, which can easily cause fear; Second, using a multimeter for discharge, the principle is to use the low resistance measurement mode of the multimeter's continuity setting (usually with a fixed resistor of tens to hundreds of ohms in series) to form a closed circuit to release electrical energy, but the multimeter is not an instrument specifically for discharge, and frequent use for discharge can easily damage it and it is inconvenient to carry.

[0004] Therefore, there is an urgent need for a safe, reliable, easy-to-determine discharge state, and highly versatile discharge device for switching power supplies. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a discharge device for switching power supplies, thereby resolving the issues of low safety, difficulty in determining discharge status, and poor versatility in existing discharge methods.

[0006] To solve the above-mentioned technical problems, this utility model provides the following solution: A discharge device for a switching power supply, comprising a PCB circuit board, wherein the PCB circuit board is provided with a discharge circuit, the discharge circuit comprising: Cement resistor R1; An indicator light circuit is connected in parallel with the cement resistor R1. The PCB circuit board has two solder joints, which are electrically connected to the two ends of the cement resistor R1; The discharge device also includes two probes, which are welded to the two solder points one-to-one.

[0007] Furthermore, the indicator circuit includes a resistor R2 connected in series and a light-emitting diode D1.

[0008] Furthermore, the discharge device for the switching power supply also includes an insulating outer layer that covers the PCB circuit board and the cement resistor R1, with the outer ends of the two probes extending out from the insulating outer layer.

[0009] Furthermore, the insulating outer layer also has a clearance opening for avoiding the light-emitting diode D1.

[0010] Furthermore, the insulating outer layer is a heat-shrinkable outer layer.

[0011] Furthermore, the probe is a bendable probe, and the distance between the outer ends of the two probes can be achieved by controlling the bending angle of the probe.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The discharge device of this utility model has high safety: a cement resistor R1 is set as the discharge resistor, the discharge process is stable and avoids the generation of electric sparks; at the same time, an insulating outer layer is used to wrap the internal circuit, which effectively prevents operators from accidentally touching the circuit and thus improves the safety of use.

[0013] 2. The discharge state of this utility model is intuitive and controllable: through the indicator light circuit connected in parallel with the cement resistor R1, when the energy storage element discharges, the current flows through the light-emitting diode D1 to make it light up; when the discharge is completed, the light-emitting diode D1 turns off. The operator can intuitively judge whether the discharge has ended by observing the light status, avoiding blind operation.

[0014] 3. This utility model has strong versatility: the probe adopts a bendable design, and the distance between the outer ends of the two probes can be changed by adjusting the bending angle. It can be adapted to energy storage components with different pin spacings, eliminating the need to equip multiple discharge tools for different models of switching power supplies and reducing the cost of use.

[0015] 4. The structure of this utility model is stable and reliable: the probe and the PCB circuit board are fixed by soldering one-to-one, which is firm and avoids poor contact that may lead to discharge failure; the heat-shrinkable insulating outer layer tightly wraps the internal components, which improves the overall structural stability and anti-interference ability of the device. Attached Figure Description

[0016] Figure 1 This is a diagram of the internal structure of the discharge device of this utility model.

[0017] Figure 2 This is the discharge circuit diagram of this utility model.

[0018] Figure 3 This is a schematic diagram showing the first distance between the two probes of this utility model.

[0019] Figure 4 This is a schematic diagram of the second distance between the two probes of this utility model.

[0020] Figure 5 This is a schematic diagram of the third distance between the two probes of this utility model.

[0021] The attached diagram is labeled as follows: 1-Insulating outer layer, 2-Indicator light, 3-Probe, 4-Solder joint, 5-PCB circuit board. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1: The specific structure of this utility model is as follows: Please refer to the appendix. Figure 1-5 The present invention discloses a discharge device for a switching power supply, comprising a PCB circuit board 5, wherein the PCB circuit board 5 is provided with a discharge circuit, which includes a cement resistor R1 and an indicator light circuit. The cement resistor R1 is equivalent to a load, used to dissipate the electrical energy of the capacitor, thereby achieving the purpose of discharge.

[0025] The indicator light circuit is connected in parallel with the cement resistor R1. The indicator light circuit includes a resistor R2 and a light-emitting diode D1 connected in series. The resistance value of the resistor R2 can be selected according to the actual discharge voltage and the parameters of the light-emitting diode D1 to ensure that the light-emitting diode D1 works normally and is not damaged.

[0026] The PCB circuit board 5 has two solder points 4, which are electrically connected to the two ends of the cement resistor R1. The discharge device also includes two probes 3, which are welded one-to-one to the two solder points 4 using tin soldering to ensure a firm connection and good conductivity. The cement resistor R1 of this invention is a power resistor, which is encapsulated in a ceramic shell and filled with high-temperature resistant cement powder.

[0027] The discharge device for the switching power supply also includes an insulating outer layer 1, which is a heat-shrinkable outer layer. During assembly, the PCB circuit board 5 and the cement resistor R1 are placed inside the heat-shrinkable outer layer. Heating causes the outer layer to shrink tightly and wrap the internal components. The outer ends of the two probes 3 extend from the insulating outer layer 1. Simultaneously, the insulating outer layer 1 also has a clearance opening to allow the light-emitting diode D1 to pass through clearly.

[0028] The probe 3 is a bendable probe, made of either copper alloy or aluminum alloy, which has good conductivity and plasticity. By controlling the bending angle of the probe 3, the distance between the outer ends of the two probes 3 can be adjusted.

[0029] like Figure 3-5 The figures show the spacing of probe 3 at different bending angles, to accommodate the pin spacing requirements of energy storage components in different types of switching power supplies.

[0030] To prevent probe 3 from falling off the solder during bending, a clip can be installed on the circuit board to fix probe 3.

[0031] The working process of this embodiment is as follows: When discharging the switching power supply, the probes 3 are bent to a suitable angle according to the pin spacing of the energy storage element, so that the outer ends of the two probes 3 contact the two pins of the energy storage element respectively. At this time, the energy storage element discharges through the cement resistor R1, and the current flows through the indicator light circuit at the same time, causing the light-emitting diode D1 to light up, indicating that the discharge is in progress. As the discharge process proceeds, the voltage across the energy storage element gradually decreases. When the voltage drops below the forward voltage of the light-emitting diode D1, the light-emitting diode D1 turns off, indicating that the discharge is complete, and the operator can safely carry out subsequent maintenance operations. Example 2:

[0032] The above is a detailed description of the manufacturing and operating process of the discharge device: This utility model discloses a discharge device for a switching power supply, comprising a PCB circuit board 5. The PCB circuit board 5 uses an FR-4 epoxy glass cloth substrate, which combines good mechanical strength and insulation performance. Its dimensions are designed according to the layout requirements of the cement resistor R1 and the indicator light circuit components. The PCB circuit board 5 is equipped with a discharge circuit, which includes the cement resistor R1 and the indicator light circuit, connected in parallel with the cement resistor R1. The cement resistor R1 is selected as a 20W model with a resistance of 500Ω, which can adapt to the discharge requirements of most energy storage components of switching power supplies, ensuring that the resistor will not burn out due to insufficient power during the discharge process. The indicator light circuit includes a resistor R2 connected in series and a light-emitting diode D1. The resistor R2 is a 10kΩ±5% precision metal film resistor, which plays a current limiting role to prevent the light-emitting diode D1 from being damaged due to excessive current. The light-emitting diode D1 is a red plug-in LED with a forward voltage of 1.8-2.2V and a forward current of 10-20mA. Its brightness is moderate, making it easy for operators to observe the discharge status. The resistance value of resistor R2 can be selected according to the actual discharge voltage and the parameters of LED D1 to ensure that LED D1 works normally and is not damaged.

[0033] The PCB circuit board 5 has two solder joints 4, which are tin-plated to enhance conductivity and oxidation resistance. These two solder joints 4 are electrically connected to the two ends of the cement resistor R1 through copper foil lines on the PCB board. The discharge device also includes two probes 3. The probes 3 are made of aluminum alloy with a diameter of 1.5mm and the front end is sharpened with a tip angle of 30° to facilitate quick penetration into the oxide layer or narrow gaps of the energy storage element pins. The two probes 3 and the two solder joints 4 are fixed one-to-one by lead-free soldering process to ensure that the solder joints are firm and free of cold solder joints, and have good conductivity.

[0034] The discharge device for the switching power supply also includes an insulating outer layer 1, which is a polyolefin heat-shrinkable outer layer. During assembly, after the PCB circuit board 5, cement resistor R1, and indicator light circuit components are soldered, they are fitted into the heat-shrinkable outer layer, ensuring that the light-emitting diode D1 is aligned with the preset clearance position. Then, a hot air gun is used to heat the heat-shrinkable layer, heating it evenly from the middle of the outer layer to both ends, so that the outer layer shrinks tightly to wrap the internal components. The outer ends of the two probes 3 are led out from the insulating outer layer 1. The insulating outer layer 1 also has a reserved circular clearance, which corresponds precisely to the position of the light-emitting diode D1. The edge of the clearance is rounded to prevent scratching the operator and to allow the light of the light-emitting diode D1 to shine through clearly.

[0035] The probe 3 is a bendable probe made of tin-phosphor bronze alloy, which has good conductivity and repeated bending plasticity, and can realize the distance between the outer ends of the two probes 3 to meet the pin spacing requirements of common switching power supply energy storage components.

[0036] The working process of this embodiment is as follows: When discharging the switching power supply, first confirm that the input power supply has been disconnected. Then, according to the pin spacing of the energy storage element, refer to the positioning scale on probe 3 and bend probe 3 to a suitable angle so that the distance between the outer ends of the two probes 3 matches the pin spacing of the energy storage element. Hold the insulating outer layer 1 and make stable contact between the outer ends of the two probes 3 and the two pins of the energy storage element, ensuring good contact. At this time, the electrical energy stored in the energy storage element flows into the cement resistor R1 through probe 3 and solder joint 4, forming a discharge circuit. At the same time, the current is diverted to the indicator light circuit, and the light-emitting diode D1 lights up, indicating that the discharge is in progress. In the early stage of discharge, the discharge current is large and the brightness of the light-emitting diode D1 is high. As the discharge process progresses, the voltage across the energy storage element gradually decreases, the discharge current decreases accordingly, and the brightness of the light-emitting diode D1 gradually dims. When the voltage drops below the conduction voltage of the light-emitting diode D1 (about 1.8V), the light-emitting diode D1 is completely extinguished, indicating that the discharge is complete. At this time, the voltage across the energy storage element is usually below the 36V safety voltage, and the operator can safely carry out subsequent maintenance operations.

[0037] In summary, the discharge device of this utility model has high safety: setting a cement resistor R1 as the discharge resistor ensures a stable discharge process and avoids generating electric sparks; at the same time, the internal circuit is wrapped with an insulating outer layer, which effectively prevents operators from accidentally touching the circuit and improves the safety of use.

[0038] The discharge state of this utility model is intuitive and controllable: through the indicator light circuit connected in parallel with the cement resistor R1, when the energy storage element discharges, the current flows through the light-emitting diode D1 to make it light up; when the discharge is completed, the light-emitting diode D1 turns off. The operator can intuitively judge whether the discharge has ended by observing the light status, avoiding blind operation.

[0039] This utility model has strong versatility: the probe adopts a bendable design, and the distance between the outer ends of the two probes can be changed by adjusting the bending angle, which can be adapted to energy storage components with different pin spacings. There is no need to equip multiple discharge tools for different models of switching power supplies, thus reducing the cost of use.

[0040] This utility model has a stable and reliable structure: the probe and the PCB circuit board are fixed one-to-one by soldering, which is firm and avoids poor contact that could lead to discharge failure; the heat-shrinkable insulating outer layer tightly wraps the internal components, improving the overall structural stability and anti-interference ability of the device.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A discharge device for a switching power supply, comprising a PCB circuit board (5), characterized in that, The PCB circuit board (5) is provided with a discharge circuit, which includes: Cement resistor R1; An indicator light circuit is connected in parallel with the cement resistor R1. The PCB circuit board (5) is provided with two solder joints (4), which are electrically connected to the two ends of the cement resistor R1; The discharge device also includes two probes (3), which are welded to the two solder points (4) one-to-one.

2. The discharge device for a switching power supply according to claim 1, characterized in that, The indicator light circuit includes a resistor R2 connected in series and a light-emitting diode D1.

3. The discharge device for a switching power supply according to claim 2, characterized in that, The discharge device for the switching power supply also includes an insulating outer layer (1), which covers the PCB circuit board (5) and the cement resistor R1, and the outer ends of the two probes (3) are led out from the insulating outer layer (1).

4. A discharge device for a switching power supply according to claim 3, characterized in that, The insulating outer layer (1) also has a clearance opening, which is used to avoid the light-emitting diode D1.

5. A discharge device for a switching power supply according to claim 3, characterized in that, The insulating outer layer (1) is a heat-shrinkable outer layer.

6. A discharge device for a switching power supply according to claim 1, characterized in that, The probe (3) is a bendable probe. By controlling the bending angle of the probe (3), the distance between the outer ends of the two probes (3) can be achieved.

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