Shenzhen MATCHINGIC Technology Co Ltd: Your Professional Digital Isolators Supplier
Shenzhen MATCHINGIC Technology Co., Ltd was founded in 2010, the company always adhere to the concept of talent is the company's wealth, in the years of market honed, formed a group of enterprising, innovative staff, while expanding its market share at home and abroad, the company continues to optimize internal business processes, improve international sales and procurement business, adhere to the original goods only, deepen the level of customer service, gradually formed its own industry advantages.
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Digital isolators are electronic components that provide electrical isolation between two circuits while allowing digital communication between them. They use digital signals instead of analog signals to transfer data between the isolated circuits, eliminating the need for a physical connection. Digital isolators provide protection against electrical noise, ground loops, and voltage surge. They are commonly used in applications that require high voltage isolation, such as industrial control systems, medical equipment, and power electronics.
Advantages of Digital Isolators
1. Signal isolation: Digital isolators provide high-level signal isolation, eliminating the need for opto-isolators and transformers. This helps to reduce the complexity and cost of the circuitry.
2. Noise immunity: Digital isolators are immune to electromagnetic interference (EMI) and radio frequency interference (RFI). This makes them ideal for high-frequency applications where noise pickup is critical.
3. Signal conditioning: Digital isolators can condition the signal, automatically correcting signal distortion and signal attenuation. This can help to improve signal integrity and reduce errors.
4. Power efficiency: Digital isolators require very little power to operate, making them ideal for low-power applications.
5. High-speed operation: Digital isolators can operate at high speeds, making them ideal for high-speed serial port communications, digital audio, and other applications that require fast data transmission.
6. Small size and form factor: Digital isolators are available in compact sizes, making them ideal for space-limited applications. They also typically have a smaller form factor than opto-isolators and transformers, which can be an advantage in some designs.
7. Low cost: Digital isolators are typically less expensive than opto-isolators and transformers, making them a cost-effective alternative for many applications.
Uses of Digital Isolators
Digital isolators are widely used in devices that require insulation in electronic circuits. First of all, they are used in industrial machinery where there are large voltage differences among devices. Power supplies that require large voltages or large motors and parts that operate with small voltages are located close together and must be isolated where there is a large voltage difference.
This is to prevent damage caused by the application of high voltage to parts that operate at low voltages. Next, it is also used for medical equipment such as X-rays and AEDs. These medical devices are often used with the hands, and the purpose is to prevent electric current from flowing outward and causing an electric shock.
In automobiles, digital isolators are used to protect ECUs and other in-vehicle devices in vehicles that use high-voltage power supplies, such as electric vehicles and hybrid vehicles.
Why Use a Digital Isolator
Digital isolators are most commonly used when potential ground differences are present. Sensor inputs can operate at varying voltages, ranging from as low as 3 volts to 48 volts or higher, and a digital isolator helps provide for this type of application.
For example, if the microprocessor is operating at 3.3 volts and the inputs range from 24 volts to 48 volts, this could cause a significant potential difference in ground voltages, which can introduce damaging voltage levels to the devices present, skew sensor data, and introduce errors. Some form of isolation is needed to ensure accuracy. The sensor signal is usually conditioned by filters, protection circuits, an amplifier, and digitized by an ADC. This is the data signal that's needed by the PLC processor to function.
A digital isolator is used to eliminate any errors due to ground loops. And it's desirable for the digital isolator to have a low latency or propagation delay, low noise, and a high data rate. In effect, the less a digital isolator is visible to the input signal, the better.
How Does a Digital Isolator Work
Digital isolators couple data across an isolation barrier. This is achieved by using a modulator to transmit high frequency carrier across the barrier to represent either a high or low digital state and no signal to represent the other state. The receiver demodulates the signal after advanced signal conditioning to produce an isolated output through a buffer stage.
Digital isolators use single-ended CMOS or TTL logic switching technology. The voltage range normally ranges from 3 volts to 5.5 volts for both supplies, VCC1 and VCC2, though some devices may support a larger supply voltage range. When designing the digital isolators, it is important to keep in mind that due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended digital signal lines.
Careful consideration of layouts should be used when using a digital isolator. A minimum of four layers is required to accomplish a low EMI PCB design.
Layer stacking should be in the following order from top to bottom:
● High-speed signal layer
● Ground plane
● Power plane
● Low frequency signal layer
Routing the high-speed traces on the top layer avoids the use of vias and the introduction of air inductances and allows for clean interconnects between isolator and the transmitter and receiver circuits of the data link.
Placing a solid ground plane next to the high-speed signal layer establishes controlled impedance for transmission light interconnects and provides excellent low inductance path to the return current flow. Placing the power supply next to the ground plane creates an additional high frequency bypass capacitance. Routing the slower-speed control signals on the bottom layer allows for greater flexibility, as these signal lengths usually have margin to tolerate discontinuities such as vias.
If an additional supply voltage plane or signal layer is needed, add a second power or ground plane system to the stack to keep it symmetrical. This makes the second mechanically stable and prevents it from warping. Also, the power and ground plane at each power system can be placed closer together, thus increasing the high frequency bypass capacitance significantly.
Compared to conventional optocouplers, digital isolators perform better regarding propagation delays, data rate, and noise reduction. However, digital isolators are more expensive. Optocouplers are commonly used as low-cost isolation solutions when digital signals are transmitted slowly. Digital isolators are offered at low costs by several companies, but they are not useful for PV inverters since they are fabricated with conventional semiconductor processing technologies in order to achieve channel counts and functional integration. Digital isolators that use complementary metal-oxide-semiconductor (CMOS) process technology are gaining popularity among designers due to the high cost of alternative isolation technologies. It enables designers to design low-cost, compact, reliable, and high-performance isolated circuits that use less power than optocouplers. In addition to their type and ability to pass current, digital isolators are priced according to the application for which they will be used.
With the growing popularity of digital isolators in industrial and automotive applications, it can be overwhelming to select the best device for your system from the plethora of available options. Adding to this challenge, most digital isolators are designed with specific system requirements and applications in mind, leaving you to sort through endless specifications and features to ensure that the device you have selected will meet your system's requirements.
Step one: Understanding your isolation specification requirements
The first step is to understand your system's isolation specification requirements. While requirements can sometimes feel like an open-ended list, to get started, consider these requirements related to common isolation design:
- Isolation withstand voltage (VISO). Is basic isolation and ≤3,000 VRMS sufficient for your design, or do you require ≥5,000 VRMS? Regulatory requirements often dictate this specification, which represents the voltage the isolator can handle without breakdown for at least 60 s.
- Working voltage (VIOWM). What is the consistent voltage that your isolation barrier needs to withstand for the lifetime of the product? Factors such as package size, pollution degree and material group can affect the working voltage of a component.
uts. - Surge isolation rating (VIOSM). Does the design require reinforced isolation? If so, you will need an isolator that can withstand >10-kV surge pulses.
- Creepage/clearance. Is 4-mm creepage/clearance sufficient, or does your system standard require 8 mm or even higher? This specification will be dictated by the isolators package and lead frame.
- Common-mode transient immunity (CMTI). Will the system be in a noisy environment such as motor drives or solar inverters, where data integrity is critical and any bit errors can result in dangerous short-circuit events? If so, a high CMTI rating will be critical for your digital isolator.
- Power consumption. Is overall system power consumption a critical specification for your application; for example, is the system 4- to 20-mA loop-powered or battery-powered? If so, consider the per-channel current consumption specifications of each device.
- Data rate. What data rate does your communication interface require? Are you running slow universal asynchronous receiver transmitter speeds or high-speed ≥100-Mbps data protocols? In that case, you may consider each devices' maximum data rate.
Step two: Selecting the right package
Once you have narrowed down your digital isolator specification requirements, the next step is to consider different package options. Packages can make a big difference when it comes to isolation, since the size and characteristics of the package directly affect a device's high-voltage capabilities. Some of the same requirements in the list above (creepage, clearance, VIOWM, VIOSM, VISO) also influence package selection. A larger package with wider creepage and clearance will allow for higher isolation voltage specifications. If you can meet your system's regulatory requirements with a smaller package option, a smaller package will of course help save both board space and cost. Additionally, you will want to consider how many channels of isolation your communication interface requires since higher channel counts dictate package type.
Step three: Determining channel count and configuration
After specifications and requirements and packaging, there are just a few more options to consider. Determining how many channels of isolation you need for your signals and which direction each signal will go will help you determine your channel count and channel configuration. And considering your preferred default output state (or fail-safe state) will help you determine the predefined state of the output pin (either high or low) when the input channel of a digital isolator is unpowered or the pins are left floating. Options may be available for both default-high and default-low outp
Classification of Digital Isolator
Optical isolation
Optical coupling technology is the transmission of light on a transparent insulating isolation layer (for example air gap) to achieve isolation. The optical coupler generally consists of three parts: Light emission, signal amplification, and light reception. The input electrical signal drives the LED to emit light of a certain wavelength, which is received by the photodetector to generate a photocurrent. It is further amplified and then output. This completes the electricity-optical-electricity conversion, thereby playing the role of input, output, and isolation. The main advantage of optical coupling technology is that light has inherent immunity to external electrons or magnetic fields, and optical coupling technology allows constant information transmission.
Capacitance isolation
Capacitive coupling technology uses a constantly changing electric field on the isolation layer to transmit information. The material between the plates of each capacitor is a dielectric isolator which forms an isolation layer. The size of the plates, the spacing between the plates, and the dielectric material all determine the electrical performance.
The advantage of using a capacitive isolation layer is the high efficiency in terms of size and energy transmission, as well as immunity to magnetic fields. The disadvantage of capacitive coupling technology is that it has no differential signal and noise, and the signal shares the same transmission channel, which is different from the transformer. This requires the signal frequency to be much higher than the expected frequency of the noise so that the isolation layer capacitance presents the low impedance of the signal and the high impedance of the noise.
Electromagnetic isolation
Inductive coupling technology uses the changing magnetic field between two coils to communicate on an isolation layer. The most common example is a transformer, whose magnetic field depends on the coil structure (number of turns/unit length) of the primary and secondary windings, the dielectric constant of the magnetic core, and the current amplitude.
Digital Isolator Market: Segment Overview
Giant magnetoresistive to dominate market due to its superior accuracy
As a result of their superior sensitivity and accuracy, digital isolators based on GMR isolation technology are growing rapidly in this segment. In addition to having a fast switching speed of up to 150 MBPS, the GMR isolation technology also has a low propagation delay of 10 to 15 nanoseconds. The magnetoresistive-based digital isolators are becoming increasingly popular due to their long shelf lives and the materials they are made from.
With increased demand for industrial machinery, industrial category to dominate market
In the forecast period, the industrial segment held the largest market share, and it is anticipated that it will continue to rule the market during the forecast period. Industrial machinery must include digital isolators to protect users and industrial equipment from ground loops and discrepancies, as well as noise and voltage fluctuations. The use of these isolators also keeps industrial machinery and its operators safe. The digital isolator market for the industrial vertical is growing as industrial automation solutions and systems are being deployed to reduce indirect industrial expenses and increase operating profitability. A digital isolator protects these electric drivers from a power shock when electric drivers power them.
Shenzhen MATCHINGIC Technology Co., Ltd was founded in 2010, the company always adhere to the concept of talent is the company's wealth, in the years of market honed, formed a group of enterprising, innovative staff, while expanding its market share at home and abroad, the company continues to optimize internal business processes, improve international sales and procurement business, adhere to the original goods only, deepen the level of customer service, gradually formed its own industry advantages.
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