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Maintenance and repair methods of switching power supply

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Switching power supply protection tutorial

[/vc_column_text][vc_column_text]Switching power supply is an indispensable part of various electronic equipment, and its quality is directly related to the technical indicators of the electronic equipment and whether it can be operated safely and reliably. Since the main internal components of the switching power supply work in high-frequency switching conditions, the power consumption is small, the conversion rate is high, and the volume and weight are only 20%-30% of the linear power supply, so it has now become the mainstream product of the stabilized power supply. The maintenance of electrical defects of electronic equipment is based on the principle of easy to difficult. Basically, the power supply is first started. After the power supply is confirmed to be normal, other parts of the maintenance are carried out, and the electrical shortcomings of the power supply account for the largest part of the electrical shortcomings of electronic equipment. most. Therefore, understanding the basic operation principle of the initial power supply, understanding its maintenance skills and common shortcomings will help shorten the maintenance time of electronic equipment shortcomings.[/vc_column_text][vc_column_text]

Disadvantages of switching power supply and maintenance methods

[/vc_column_text][vc_column_text]1. No output stabilizer tube is normal. This phenomenon indicates that the switching power supply is not operating or has entered a protection condition. The first thing to do is to measure whether the recommended pin of the power control chip has a recommended voltage. If there is no recommended voltage or the recommended voltage is too low, check whether the resistor and the external components of the pin are leaking. At this time, if the power control chip is normal, it can be activated by the above inspection. Find the shortcomings. If there is a recommended voltage, measure whether the output terminal of the control chip has high or low level jumps at the moment of power-on. If there is no jump, it means that the control chip is broken, the peripheral oscillation circuit components or the protection circuit are defective, and the control can be replaced first. Chip, then check the peripheral components; if there is a jump, it is generally a bad or damaged switch tube.

2. For stable burning, first check the large filter capacitors on the 300V, the diodes of the rectifier bridge, and the switching tubes. Problems with the anti-interference circuit can also lead to stable burning and blackening. Need to pay attention to: the stable burning caused by the breakdown of the switch tube will generally burn out the current detection resistor and the power control chip. Negative temperature coefficient thermistor is also very simple and stable to be burned out.

3. There is an output voltage, but the shortcoming of the output voltage is too high generally comes from the voltage stabilization sampling and voltage stabilization control circuit. The DC output, sampling resistor, faulty sampling amplifier such as TL431, optocoupler, power control chip and other circuits together form a closed control loop. Anything wrong will cause the output voltage to rise.

4. The output voltage is too low. In addition to the voltage stabilization control circuit will cause the output voltage to be low, there are also some of the following reasons also cause the output voltage to be low:

1. Switching power supply load has short-circuit shortcomings (especially DC/DC converter short-circuit or poor function, etc.). At this time, all loads of the switching power supply circuit should be disconnected to distinguish that the switching power supply circuit is still a load circuit with shortcomings. If the voltage output of the disconnected load circuit is normal, it means that the load is too heavy; or it is still abnormal, indicating that the switching power supply circuit has shortcomings.
2. The failure of the rectifier diode and filter capacitor at the output voltage can be judged by substitution method.
3. The decrease of the function of the switching tube will inevitably lead to the failure of the switching tube to conduct normally, which will increase the internal resistance of the power supply and decrease the load capacity.

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What is a Capacitive switch? and Advantages of Capacitive switch

[/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”7771″ img_size=”1200×300″][/vc_column_inner][/vc_row_inner][vc_column_text]Capacitive switches have gained a lot of popularity in recent years as an alternative to membrane switches, mechanical switches, elastomer keypads, and other input device options. With no mechanical parts to wear down, a slim profile that can be applied to curved surfaces, and intricate backlighting options, capacitive switches offer some exciting possibilities for your user interface. The Langir Electric started investing in the development of capacitive switch technology early in the interface’s inception. This has given our design engineers the experience to help you develop a world class solution for your product.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

What is a capacitive switch?

[/vc_column_text][vc_column_text]A capacitive switch is an electronic capacitor that measures changes in capacitance values when a conductive object such as your finger moves closer to the sensing area. The change in that value is interpreted and registers that change as an activation of the switch. A capacitive switch can be either a flexible printed circuit or a sensing pad on a rigid PCB. A capacitive switch can incorporate a lot of functionality that is not easily attained with a normal membrane or mechanical switch. Capacitive switches can have intensity sliders, sensitive areas in multiple shapes such as a circle, and can have varying levels of sensitivity for activation. You also can have options like a proximity sensor incorporated into a capacitive switch for additional functional benefits. As a capacitive switch is a sensor that senses through a non-conductive surface, thicker substrates can be used such as safety glass, or acrylic materials for a very robust switch. This can also give the ability for additional gasketing for harsh environments. It is also possible to achieve very intricate backlighting solutions with capacitive switch technologies.[/vc_column_text][vc_column_text]

Capacitive Switch Construction

[/vc_column_text][vc_column_text]A capacitive switch will generally need about three layers to function. A graphical overlay, a circuit layer, and a backing material. The graphical overlay could be any non-conductive material of various thicknesses including; glass, polyesters, polycarbonates, acrylic materials, and many other non-conductive materials. The circuit layer can be a thin plastic flex circuit, or a sensing pad laid out on a rigid PCB. The backing material could be a metal back plate, glass, plastic, or can be adhered to part of your product. It is also possible to adhere a flexible circuit to the inside of a sealed container with a graphic outside to protect the electronics in harsh environments. Capacitive switch constructions can be more complex depending on backlighting options or shielding requirements.[/vc_column_text][vc_column_text]

Metal-over-cap switch

[/vc_column_text][vc_column_text]A metal-over-capacitive switch is a unique solution that allows the use of aluminum, steel, or other conductive materials in front of a capacitive switch or sensor. This can allow a product to maintain an all metal look to it while still utilizing capacitive technologies that give the ability for very finite sensing options.[/vc_column_text][vc_column_text]

Advantages of Capacitive Switches

[/vc_column_text][vc_column_text]Thin construction that can be applied to curved surfaces
No moving parts to wear down leading to a long-life span
Intricate backlighting possibilities
Functionality that is not easily available in other switch options
Proximity or sub surface sensing
Capacitive Switch Options
Custom color matching and intricate graphical layer design – Our team has the experience to make the face of your product stand out from the field.
Proximity Sensing – Capacitive switches can have built in proximity sensing options to add functionality to your product
Enhanced Functionality – capacitive switches can incorporate unique switch functionality such as sliders, wheels, locking keys, and other features.
Metal-over-cap – special capacitive switches and sensors can be built using metal-over-cap technology that allows conductive materials over the sensor area.
Tactile feedback – Tactile feedback can still be achieved on a capacitive switch using haptics and other methods
Embossed Keys – Key areas can be embossed, or raised or lowered, to give a feel guide to where the key is.This can be a pillow or ring emboss.
Backlighting – Custom backlighting solutions for your product can include; led light guide films, EL Lamps, and fiber optics. While LED light guide films can provide the most even lighting options, each application has its advantages and we can help guide you to the best solution for your project.
Display windows – These can be incorporated into a variety of shapes and sizes and can be tinted or clear.
Shielding – Capacitive switches can be built with EMI, RFI, and ESD layers to protect your product.
Backplates – Capacitive switch assemblies can be stand-alone flexible circuits or built up on rigid backplates including aluminum, steel, or other options.
PCB’s –Capacitive switches can be sensing pads on rigid PCBs that can also act as a rigid backplate.
Termination – A variety of terminations can be used to mate a capacitive switch to your product. Our team can match your specifications[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_zigzag]

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What is product liability?

[/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”8008″ img_size=”720×200″ alignment=”center”][/vc_column_inner][/vc_row_inner][vc_column_text]Product liability refers to situations where a customer purchases a product, and an issue with the product causes a bodily injury or property damage to a 3rd party. Business owners can be found responsible for the damages if the source of the issue can be traced back to the small business. Some of the common issues customers encounter that result in product liability claims include:[/vc_column_text][vc_column_text]

• Products that cause bodily injury to the customer
• Products that cause property damage
• Sickness caused by food or beverages

[/vc_column_text][vc_column_text]There are many different things that can cause a product issue, but 3 of the common reasons are:[/vc_column_text][vc_column_text]

1. Design defect: This issue will be present in a product before it’s even made. It suggests that the design of the product is unsafe or faulty.
2. Manufacturing defect: This issue suggests that something went wrong while the product was being made. Perhaps it was assembled wrong, or missing an important piece.
3. Marketing defect: This type of issue has nothing to do with the product itself, but rather how it was marketed to the customer. Incorrect labelling, incorrect safety warnings (or lack thereof) or insufficient instructions are common marketing defects.

[/vc_column_text][vc_column_text]The right product liability policy will help protect your business from legal costs if you’re found responsible for a product causing bodily injury or property damage to a 3rd party.[/vc_column_text][vc_column_text]We are always committed to providing customers with the best solutions and methods[/vc_column_text][vc_column_text]Download(397KB)[/vc_column_text][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1626837845586{background-image: url(https://test.langir.com/wp-content/uploads/2020/04/product-liability-insurance.jpg?id=8008) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}”]

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An anti-surge resistor

[/vc_column_text][vc_column_text]An anti-surge resistor that delivers high power dissipation and high reliability in a compact case size? Vishay RCS series of thick film chip resistors has you covered.[/vc_column_text][vc_column_text][/vc_column_text][vc_column_text]We are always committed to providing customers with the best solutions and methods[/vc_column_text][vc_zigzag]

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Super short Capacitive switch for TEEPTRAK solutions

[/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”7996″ img_size=”1000×200″ alignment=”center”][/vc_column_inner][/vc_row_inner][vc_column_text]Capacitive switch technology is based on the principle of signal detection through capacitance or resistive coupling (human touch) of identified generated input pulses.

The touch surface can be designed with virtually any dielectric material including glass, plastic, polycarbonate, or any rough or smooth surface less than 25mm thick. Sensitivity is adjustable allowing operators to actuate the device with or without gloves. Because there are no moving parts, a capacitance switch is rated for more than five million cycles.

Capacitance switch technology provides cost-effective design alternatives to other switch technologies. Open architecture allows for easy integration or retrofit into a wide range of switch applications.
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• Non-illum.
• Super short body:16mm
• Robust and durable switch
• Available with different bushing diameters(16~25mm)
• Plastic color: Red, Green, Black, White and Blue

[/vc_column_text][vc_column_text]Download(323KB)[/vc_column_text][/vc_column][vc_column width=”1/3″]

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Square bezel anti-vandal switch

[/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”7925″ img_size=”1200X400″ alignment=”center”][/vc_column_inner][/vc_row_inner][vc_column_text]The L19S and L22S is a pushbutton switch with vandal-proof features. The Square bezel anti-vandal switch provides a unique aesthetic feature of a 25mm square bezel over the standard round bezel. The panel cut-out size is 19mm and 22mm diameter and it provides IP65 rating for dust and moisture protection. It offers multiple options such as ring illumination, 1NO1NC or 2NO2NC circuits, stainless steel housing material, and many LED color options which also includes an RGB LED option. The switch is also available in either a momentary or a latching function and can also be supplied with laser etched power symbol. There is also the option to add wire leads for your convenience.[/vc_column_text][vc_column_text][/vc_column_text][vc_column_text][/vc_column_text][/vc_column][vc_column width=”1/3″ css=”.vc_custom_1626841182606{background-color: #d6d6d6 !important;}”]

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Clearaudio ELECTRONICS Successful Solutions

[/vc_column_text][vc_single_image image=”7923″ img_size=”960X400″ alignment=”center” css=”.vc_custom_1626842348696{background-color: #171513 !important;}”][vc_column_text]Being specialised in analogue music playback, it is our responsibility to promote continuous technological development to create improved standards that establish audiophile listening pleasure at its highest level. Perfection in manufacturing and measurement is reflected in a superior sound: the purest listening quality, and the reason we put our concentration on even the tiniest detail. Without exception, our electronics are made of selected components of the highest material quality.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_zigzag]

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Super short Capacitive switch

[/vc_column_text][vc_row_inner][vc_column_inner][vc_single_image image=”7250″ img_size=”1000X250″ alignment=”center”][/vc_column_inner][/vc_row_inner][vc_column_text]Capacitive switch technology is based on the principle of signal detection through capacitance or resistive coupling (human touch) of identified generated input pulses.

The touch surface can be designed with virtually any dielectric material including glass, plastic, polycarbonate, or any rough or smooth surface less than 25mm thick. Sensitivity is adjustable allowing operators to actuate the device with or without gloves. Because there are no moving parts, a capacitance switch is rated for more than five million cycles.

Capacitance switch technology provides cost-effective design alternatives to other switch technologies. Open architecture allows for easy integration or retrofit into a wide range of switch applications.

The CP Series Capacitive switch technology senses the touch of a finger and creates an electrical charge to activate the switch. An auto-calibration function ensures the sensor adapts to changing external environments.
LANGIR’s capacitive switch are specially designed for durability and a low activation force. As sensitive as a touch screen, the capacitive switch are perfect for industrial applications where repetitive activation can cause operator fatigue.[/vc_column_text][vc_column_text][/vc_column_text][vc_column_text]

• Non-illum.
• Super short body:9mmm
• Robust and durable switch
• Available with different bushing diameters(16~25mm)
• Plastic color: Red, Green, Black, White and Blue

[/vc_column_text][vc_column_text]Download(323KB)[/vc_column_text][/vc_column][vc_column width=”1/3″]

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