Capacitor aging transient current elimination short circuit method

Abstract

The invention discloses a capacitor aging transient current short circuit elimination method, and relates to the technical field of capacitors, and the capacitor aging transient current short circuit elimination method comprises the following steps: S1, using an overcurrent protection circuit; s2, using a current-limiting resistor; s3, using a transient voltage suppressor; s4, using automatic detection and data monitoring; s5, a thermistor (PTC) and an MOSFET switch are used after the step S4, and a fuse and a resettable fuse are additionally installed at the front end of a capacitor in the circuit in the step S1; the method for installing the fuse at the front end of the capacitor is the simplest method. According to the method for eliminating the short circuit of the capacitor aging instant current, the automation degree of the device is improved through S4 and S5, the short-circuit capacitor can be detected in time before the capacitor enters the aging machine, and the short-circuit capacitor is eliminated, so that the short-circuit capacitor is prevented from influencing the aging work of other normal capacitors, and the service life of the capacitor is prolonged. Therefore, the stable output of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of capacitors, and in particular to a method for eliminating short circuits of instantaneous currents during capacitor aging. Background Art

[0002] Capacitor aging and the resulting short circuit problem are common technical challenges in the electronics industry. In the past, due to the lack of reliable testing equipment, the cause of capacitor failure was often simply attributed to external impact or the use of counterfeit products, without in-depth analysis. In fact, the failure mechanism of capacitors may involve multiple factors, such as resistor film burnout, lead breakage, etc.

[0003] For example, Chinese patent publication number CN108648914A discloses an aging treatment method for aluminum electrolytic capacitors, which uses 20 aging power supplies to perform segmented current limiting and voltage boosting on aluminum electrolytic capacitors. The voltage boost is slow during the aging process, which reduces the leakage current of the capacitor and the pressure on each capacitor, thereby improving the stability of the product. Before boosting the voltage, a large current shock is applied to the capacitor to eliminate unqualified products in advance, further improving the pass rate and stability of the screened products.

[0004] The existing technology has the following problems: The existing capacitors are short-circuited by instantaneous current during aging. When a capacitor is short-circuited during application, the circuit will be impacted by the current, causing damage to the electrical appliance. At the same time, there is a lack of automation in the short-circuit elimination of capacitors due to aging to avoid short-circuit control. It can be seen that the existing capacitors have poor stability during application. The aging treatment of the capacitors has a fast voltage boost speed, which is easy to have adverse effects on the product. Summary of the invention

[0005] The present invention provides a method for eliminating short circuits of instantaneous current during capacitor aging, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for eliminating short circuits caused by instantaneous current during capacitor aging, wherein the steps of eliminating short circuits caused by instantaneous current during capacitor aging include: S1: Use overcurrent protection circuit; S2: Use current limiting resistor; S3: Use transient voltage suppressors; S4: Use automated detection and data monitoring; S5: Use thermistor (PTC) and MOSFET switch after passing step S4.

[0007] Preferably: Step S1: installing a fuse and a resettable fuse at the front end of the capacitor in the circuit; Fuse it: Installing a fuse at the front end of the capacitor is the simplest method. When the capacitor is short-circuited, the fuse will quickly blow, cutting off the current and protecting the subsequent circuits; Resettable fuse: A resettable fuse will disconnect when the current is too large and automatically recover after cooling, which is suitable for occasions that require frequent operation.

[0008] Preferably: in step S2, a current limiting resistor is connected in series at the front end or the rear end of the capacitor, which can limit the peak current and avoid excessive current shock when the capacitor is short-circuited. The resistance value of the current limiting resistor needs to be selected according to the rated voltage and current of the capacitor.

[0009] Preferably: Step S3 (TVS) can quickly provide a low impedance channel when the capacitor is short-circuited, directing the excessive current to the ground or other safe paths, thereby protecting the circuit from shock.

[0010] Preferably: the automated detection in step S4: can quickly identify the aging or short-circuit of capacitors. Through a dedicated detection device, such as a megohmmeter, the automated detection can detect short-circuited capacitors in time before the capacitors enter the aging machine, and remove them to avoid affecting the aging work of other normal capacitors; Data monitoring: Data monitoring is equally important during the capacitor aging process. By applying the rated voltage to the capacitor and monitoring parameters such as leakage current, the degree of capacitor aging and whether there is a short circuit risk can be determined. The specific steps include applying the rated voltage at room temperature and high temperature, and monitoring the changes in leakage current to ensure that the performance of the capacitor meets the standard requirements.

[0011] Preferably: after the detection in step S4, it is convenient to use S5 that the positive temperature coefficient thermistor (PTC) will quickly heat up when the current is too large, and the resistance value will increase, thus limiting the flow of current. When the fault is eliminated, the PTC will automatically return to a low resistance state; The temperature coefficient of detection exceeds the transmission signal. When using MOSFET as a switch, when the capacitor is detected to be aging or short-circuited, the MOSFET is quickly turned off to cut off the circuit. This requires the cooperation of the current detection circuit to achieve this.

[0012] Preferably: the device has a high degree of automation through S4 and S5, and can detect short-circuited capacitors in time before the capacitors enter the aging machine and remove them, thereby preventing the short-circuited capacitors from affecting the aging work of other normal capacitors.

[0013] Preferably, in the steps S1-S5, for the digital control circuit, the state of the capacitor can be monitored in real time by software, and when an abnormality is detected, the power supply is quickly cut off or the protection mode is enabled through software instructions.

[0014] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art: The present invention provides a method for eliminating short circuits during instantaneous current during capacitor aging. Through step S3, a transient voltage suppressor can quickly provide a low-impedance channel when the capacitor is short-circuited, and guide the excessive current to the ground or other safe paths, thereby protecting the circuit from impact, and realizing that the TVS can respond to the transient voltage peak at an extremely fast speed (usually at the nanosecond level) to effectively suppress overvoltage. The TVS can absorb surge power of up to several kilowatts, clamp the potential between the two electrodes to a predetermined value, and protect the capacitor from damage. The application of the TVS helps to maintain the voltage stability in the circuit and reduce the risk of short circuits during the aging process of the capacitor.

[0015] The present invention provides a method for eliminating short-circuit current during capacitor aging. The automation degree of the device is improved through S4 and S5. Short-circuited capacitors can be detected in time before the capacitors enter the aging machine and eliminated, thereby preventing the short-circuited capacitors from affecting the aging work of other normal capacitors, thereby improving the effect of product stability output.

[0016] The present invention provides a method for eliminating short circuits due to instantaneous current when a capacitor ages. After detection in step S4, the temperature of a positive temperature coefficient thermistor is increased, and if the temperature is too high, the resistance will increase. After the temperature is excessive, a signal is transmitted to a MOSFET as a switch, and when the capacitor ages or is short-circuited, the MOSFET is quickly turned off, thereby improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the process structure of the method for eliminating short circuits during instantaneous current of capacitor aging. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0019] like Figure 1 As shown, a method for eliminating short circuits of instantaneous currents during capacitor aging is provided, wherein the method includes: S1: Use overcurrent protection circuit; S2: Use current limiting resistor; S3: Use transient voltage suppressors; S4: Use automated detection and data monitoring; S5: Use thermistor (PTC) and MOSFET switch after passing step S4.

[0020] like Figure 1As shown, step S1 is to install a fuse and a resettable fuse at the front end of the capacitor in the circuit; Fuse it: The simplest method is to install a fuse at the front end of the capacitor; when the capacitor is short-circuited, the fuse will quickly melt, cut off the current, and protect the subsequent circuit; Resettable fuse: A resettable fuse will disconnect when the current is too large and automatically recover after cooling, which is suitable for occasions that require frequent operation.

[0021] like Figure 1 As shown, in step S2, a current limiting resistor is connected in series at the front end or the rear end of the capacitor, which can limit the peak current and avoid excessive current shock when the capacitor is short-circuited. The resistance value of the current limiting resistor needs to be selected according to the rated voltage and current of the capacitor.

[0022] like Figure 1 As shown, step S3 (TVS) can quickly provide a low impedance channel when the capacitor is short-circuited, directing the excessive current to the ground or other safe paths, thereby protecting the circuit from shock.

[0023] like Figure 1 As shown, the automated detection in step S4: can quickly identify the aging or short-circuit of capacitors. Through a dedicated detection device, such as a megohmmeter, the automated detection can detect short-circuited capacitors in time before the capacitors enter the aging machine, and remove them to avoid affecting the aging work of other normal capacitors; ‌Data Monitoring‌: Data monitoring is equally important during the capacitor aging process. By applying the rated voltage to the capacitor and monitoring parameters such as leakage current, the degree of capacitor aging and whether there is a short circuit risk can be determined. The specific steps include applying the rated voltage at room temperature and high temperature, and monitoring the changes in leakage current to ensure that the performance of the capacitor meets the standard requirements.

[0024] like Figure 1 As shown, after the detection of step S4, it is convenient to use S5. The positive temperature coefficient thermistor (PTC) will quickly heat up when the current is too large, and the resistance value will increase, limiting the flow of current. When the fault is eliminated, the PTC will automatically return to a low resistance state; The temperature coefficient of detection exceeds the transmission signal. When using MOSFET as a switch, when the capacitor is detected to be aging or short-circuited, the MOSFET is quickly turned off to cut off the circuit. This requires the cooperation of the current detection circuit to achieve this.

[0025] like Figure 1 As shown, the device has a high degree of automation through S4 and S5, and can detect short-circuited capacitors in time before the capacitors enter the aging machine and remove them, thereby preventing the short-circuited capacitors from affecting the aging work of other normal capacitors.

[0026] like Figure 1 As shown, in the steps S1-S5, for the digital control circuit, the state of the capacitor can be monitored in real time by software, and when an abnormality is detected, the power supply is quickly cut off or the protection mode is enabled through software instructions.

[0027] The working principle of the present invention is as follows: the existing device includes a chassis, a sliding groove is provided on the side of the chassis, a sliding rod is provided on the sliding groove, a movable disk is fixedly connected above the sliding rod, and a mounting seat is also provided on the chassis, and a megohmmeter is configured on the mounting seat to measure the resistance value of the capacitor, so that the resistance value of the current limiting resistor needs to be selected according to the rated voltage and current of the capacitor; at the same time, a fuse is installed at the front end of the capacitor, and a resettable fuse is installed to provide capacitor protection; the transient voltage suppressor can quickly provide a low-impedance channel when the capacitor is short-circuited, and the excessive current is guided to the ground or other safe paths, thereby protecting the circuit from impact, and the capacitor to be tested is connected to the megohmmeter terminal through the fixed wire seat at the end of the connecting rod. The device is designed with connecting rods of different lengths to meet the detection requirements of different parts of the capacitor (housing and terminal blocks); automatic detection and data monitoring make the device highly automated, and the short-circuited capacitor can be detected in time before the capacitor enters the aging machine, and it can be removed, and the thermistor (PTC) and MOSFET switch can be used to avoid the short-circuited capacitor from affecting the aging work of other normal capacitors.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for eliminating short circuits during instantaneous current of capacitor aging, characterized in that: The steps of eliminating short circuit of the instantaneous current of the capacitor aging include: S1: Use overcurrent protection circuit; S2: Use current limiting resistor; S3: Use transient voltage suppressors; S4: Use automated detection and data monitoring; S5: Use thermistor (PTC) and MOSFET switch after passing step S4.

2. A method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 1, characterized in that: Step S1: installing a fuse and a resettable fuse at the front end of the capacitor in the circuit; Fuse it: Installing a fuse at the front end of the capacitor is the simplest method. When the capacitor is short-circuited, the fuse will quickly blow, cutting off the current and protecting the subsequent circuits; Resettable fuse: A resettable fuse will disconnect when the current is too large and automatically recover after cooling, which is suitable for occasions that require frequent operation.

3. The method for eliminating short circuit of instantaneous current during capacitor aging according to claim 1, characterized in that: Step S2: A current limiting resistor is connected in series at the front end or the rear end of the capacitor, which can limit the peak current and avoid excessive current shock when the capacitor is short-circuited. The resistance value of the current limiting resistor needs to be selected according to the rated voltage and current of the capacitor.

4. A method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 1, characterized in that: STEP S3 (TVS) can quickly provide a low impedance channel when the capacitor is short-circuited, directing the excessive current to the ground or other safe paths, thereby protecting the circuit from shock.

5. The method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 1, characterized in that: The automated detection in step S4 can quickly identify the aging or short-circuit of capacitors. Through a dedicated detection device, such as a megohmmeter, the automated detection can detect short-circuited capacitors in time before the capacitors enter the aging machine and remove them to avoid affecting the aging of other normal capacitors. Data monitoring: Data monitoring is equally important during the capacitor aging process. By applying the rated voltage to the capacitor and monitoring parameters such as leakage current, the degree of capacitor aging and whether there is a short circuit risk can be determined. The specific steps include applying the rated voltage at room temperature and high temperature, and monitoring the changes in leakage current to ensure that the performance of the capacitor meets the standard requirements.

6. A method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 5, characterized in that: After the detection in step S4, the positive temperature coefficient thermistor (PTC) in step S5 will heat up rapidly when the current is too large, and the resistance value will increase, thus limiting the flow of current. When the fault is eliminated, the PTC will automatically return to a low resistance state; The temperature coefficient of detection exceeds the transmission signal. When using MOSFET as a switch, when the capacitor is detected to be aging or short-circuited, the MOSFET is quickly turned off to cut off the circuit. This requires the cooperation of the current detection circuit to achieve this.

7. A method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 6, characterized in that: The device has a high degree of automation through S4 and S5, and can detect short-circuited capacitors in time before the capacitors enter the aging machine and remove them, thereby preventing the short-circuited capacitors from affecting the aging work of other normal capacitors.

8. The method for eliminating short circuits caused by instantaneous current during capacitor aging according to claim 1, characterized in that: In the steps S1-S5, for the digital control circuit, the state of the capacitor can be monitored in real time by software, and when an abnormality is detected, the power supply is quickly cut off or the protection mode is enabled through software instructions.

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