capacitive touch switch
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Product description
Capacitive Touch Switches
Working Principle：
Touch changes the capacitance value：When the human finger is close to or touches the capacitive touch switch, since the human body is a conductor and has a certain capacitance, it is equivalent to the original capacitance structure in parallel with a new capacitor, resulting in an increase in the total capacitance value. From the electric field point of view to understand, under normal circumstances, the switch internal electric field to maintain a uniform, finger touch will change the electric field distribution, and thus change the capacitance value.
Circuit detection and signal processing：
- Signal Generation: The control circuit is usually powered by an AC power supply and periodically changes the supply potential to induce changes in the electric field between the sensing electrode and the approaching object. When the capacitance value changes, this results in a change in parameters such as current, voltage or oscillation frequency in the circuit.
- Signal Detection and Conversion: The capacitance sensor in a capacitive touch switch will detect the change in capacitance by measuring the current or oscillation frequency, etc. and convert it into an electrical signal.
- Signal Comparison and Judgment: The comparator in the electronic circuit will compare the detected electrical signal with the preset threshold value. When the capacitance change exceeds the preset threshold, the comparator output signal changes.
- Control Logic and Switch Action: The control logic section receives the signal output from the comparator and decides whether to trigger a switch action based on the change in the signal. This action can either directly control the on/off of a load or control the operation of other devices through devices such as relays and transistors.
Material Selection:
| Material | Features | Advantages | Disadvantages | Common Applications |
|---|---|---|---|---|
| Glass | Transparent, smooth, high hardness, easy to clean, scratch-resistant, typically used in high-end products | High transparency, good touch experience, easy to clean, aesthetic appearance | Heavy, fragile, relatively high cost | High-end consumer electronics, home appliances |
| Acrylic | Transparent plastic, lightweight, easy to process, but relatively scratch-prone | Lightweight, easy to mold, lower cost, good transparency | Scratches easily, tends to age, less impact resistance | Mid-range products, decorative applications |
| Polycarbonate | High transparency, impact-resistant, good durability, high heat resistance | Strong impact resistance, anti-drop, good transparency, suitable for harsh environments | Prone to scratching, surface needs extra protection | Industrial equipment, automotive electronics, home appliances |
| Metal | High strength, durable, modern look, but requires specific design for capacitive functionality | Durable, scratch-resistant, stylish, premium look | Heavy, complex design for capacitive sensors, needs optimization for conductivity | High-end home appliances, smart home products, automotive consoles |
| Ceramic | High hardness, heat-resistant, scratch-resistant, heavier | Durable, scratch-resistant, aesthetic, heat-resistant, suitable for high-end products | Heavy, high cost, fragile | Premium products, luxury home appliances, specialty designs |
Features：
- High safety: no need for direct human contact with metal, completely eliminating safety hazards, can be used even with gloves, and is not affected by dry weather, humidity and changes in human resistance.
- Strong durability: without any mechanical parts, it will not be damaged by wear and tear, and theoretically has an unlimited life span, which can reduce the cost of later maintenance.
- Good adaptability: can penetrate the insulating material shell more than 20mm, accurately detect the finger touch, the product's sensitivity, stability, reliability is not subject to changes in environmental conditions or long-term use of the impact, but also has a waterproof and strong anti-jamming ability.
- Flexible design: the sensing part can be placed behind any insulating layer, easy to make the keyboard sealed with the surrounding environment. Panel pattern, key size, shape can be designed arbitrarily, characters, trademarks, etc. can be matched arbitrarily, the appearance of beautiful, stylish, not fade, not deformed, durable.
- Simple application: using a single chip, very few peripheral parts, simple lines, no oscillation circuit, simple production process, easy to interface with the microcontroller to achieve a variety of touch control applications.
Right now, upgrade your switch!!!!
Fields of application
Consumer electronics field
In smart phones, for example, the virtual keys on the screen (e.g., back, home, and multitasking keys) are capacitive touch switches. When a finger touches these key areas, the capacitance sensor inside the phone will detect the capacitance change and then trigger the corresponding commands to realize functions such as returning to the previous interface, going back to the home screen, or opening multitasking management.
Home Appliances
On a microwave oven, different heating modes are selected by capacitive touch switches. For example, microwave ovens have mode options such as heating, defrosting, and fast heat. When the user touches the corresponding touch area, the microwave oven's control system receives commands and starts heating according to the selected mode. This capacitive touch button makes the microwave oven's operation panel more concise and easy to clean.
Automotive Electronics
In the multimedia system in the center console of a car, the volume adjustment function often uses a capacitive switch. When the driver's or passenger's finger touches the touch area of volume “+” or “-”, the system can quickly sense the capacitance change, thus realizing the volume increase or decrease, which is convenient to operate during driving.
Industrial control area
In electronic oscilloscopes, technicians use capacitive touch switches to adjust the vertical sensitivity. By touching the corresponding touch area, the measurement sensitivity of the oscilloscope in the vertical direction can be precisely changed, which facilitates the observation and measurement of electrical signals of different amplitudes.
Intelligent Lighting Field
On the intelligent desk lamp, touching the lamp rod or lampshade part of the desk lamp can realize switching on and off the lamp and adjusting the brightness. For example, touch once to turn on the light, and touch again to turn off the light; long-pressing the touch area can adjust the brightness of the light, from dark to bright or from bright to dark, providing users with a convenient lighting control experience.
Development trend
- Integration and Intelligence: In the future, capacitive touch switches will be integrated with more functional modules to realize more complex operation and control. At the same time, combined with artificial intelligence and machine learning technology, capacitive touch switches will have self-learning and self-adaptive capabilities.
- Miniaturization and thin and light: With the development of electronic products to miniaturization and thin and light, capacitive touch switches will also continue to reduce the size and improve the degree of integration to adapt to market demand.
- Integration of new technologies: Combined with other emerging technologies such as flexible display technology, biometrics, etc., new touch switch products with more functions and better user experience will be developed.
Why choose us?
JASPER is a capacitive touch switch manufacturer with 18 years of experience, we focus on customer satisfaction and provide tailor-made solutions to meet customers' needs.JASPER has 2500 square feet of production base in China and 1500 square feet of 50,000 class constant temperature and humidity clean room, which can effectively reduce the effect of dust, temperature and humidity and static electricity on the performance of capacitive touch switches to ensure the sensitivity, accuracy, stability and reliability of the products.JASPER has 10 industry patents and many certifications: ISO, TUV, ROHS, etc. 4 fully-automatic screen printers and 6 semi-automatic screen printers can print up to 6000 sheets per hour. We have 4 R&D engineers with more than 10 years of experience and advanced production processes. 10 quality inspectors ensure that each product is subject to strict quality inspection. These advantages enable JASPER's capacitive touch sensors to perfectly meet your technical, service, quality and delivery requirements.
By choosing JASPER, you are choosing a partner with leading-edge technology and services that will help your project succeed and your business grow.
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