TD851 DIP4 DC InputPhoto Transistor OptocouplerBelong toDIP4 High Voltage Transistor
The TD851 series combine an AlGaAs infrared emitting diode as the emitter which is optically coupled to...
High Voltage Transistor Optocoupler
What is a high-voltage optocoupler?
High voltage linear optocoupler is a photoelectric sensor widely used in industrial, communication, and medical fields. It isolates the input and output circuits through optical coupling technology, thereby achieving signal transmission between high voltage and low voltage. This article will introduce the working principle and circuit design of high-voltage linear optocouplers.
The working principle of high-voltage linear optocoupler
High voltage linear optocouplers utilize the optical coupling effect to achieve the transmission and isolation of high voltage signals. Optocoupler devices typically consist of a pair of light-emitting diodes (LEDs) and photodiodes (photodiodes). When the input voltage is applied to the LED, the light generated by the LED will be received by the photodiode and converted into a voltage signal. During this process, the input circuit and output circuit are isolated by light, thereby achieving safe transmission of high-voltage signals.
Design points of high-voltage linear optocoupler circuit
1. Selection of photodiodes: When designing high-voltage linear optocoupler circuits, it is necessary to choose photodiodes suitable for high-voltage environments. Usually, photodiodes with high sensitivity and fast response are chosen to ensure the accuracy and stability of transmission.
2. Driver circuit design: In order to ensure the normal operation of the LED, it is necessary to design a suitable driver circuit. This circuit typically includes a current limiter and a voltage regulator to ensure that the LED operates at the appropriate current and voltage.
3. Isolation circuit design: In order to achieve isolation between the input circuit and the output circuit, appropriate isolation circuits need to be designed. This circuit typically uses the reverse current of a photodiode as the input signal and is converted into an output voltage through appropriate circuit design. Common isolation circuits include optoelectronic coupling amplifiers and isolation transformers.
4. Noise suppression: In high-voltage linear optocoupler circuits, noise is a common problem. In order to reduce the impact of noise on signal transmission, a series of noise suppression measures can be taken, such as the application of filters, ground wire isolation, and signal amplification.
5. Safety considerations: In the design of high-voltage linear optocoupler circuits, safety is an important factor to consider. It is necessary to ensure that the circuit can operate stably and withstand the test of high-voltage environment. In addition, appropriate protective measures should be taken to prevent high voltage in the circuit from causing harm to personnel and equipment.
High voltage linear optocoupler is an important photoelectric sensor that can achieve isolation and transmission of high voltage signals. When designing high-voltage linear optocoupler circuits, factors such as the selection of photodiodes, driving circuit design, isolation circuit design, noise suppression, and safety need to be considered. Through reasonable circuit design and optimization, stable operation and high-quality signal transmission of high-voltage linear optocouplers can be achieved.
-
![DIP 4 High Voltage Transistor]()
-
![SOP 4 High Voltage Transistor]()
SOP 4 High Voltage TransistorTD351 belongs to SOP4 High Votage Transistorread more
The TD351 series combine an AlGaAs infrared emitting diode as the emitter which is optically coupled to a silicon planar phototransistor... -
![DIP 4 High Voltage Darlington Transistor]()
DIP 4 High Voltage Darlington TransistorTD852 belongto DIP4 High Voltage DarliangtonTransistorread more
The TD852 series combine an AlGaAs infrared emitting diode as the emitter which is optically coupled to a silicon planar darlington...
Why Choose Us
Quality services
Our team is committed to delivering high-quality services to our clients. We use the latest technologies and tools to ensure that our services exceed your expectations.
01
Quality
We offer high quality services and products that are relatable and resonate with your business needs.
02
Experience and expertise
Our company has been in business for many years and has amassed significant expertise and experience to provide quality services to our clients.
03
Competitive pricing
We offer competitive pricing for our services without compromising on quality.
04
Certifications and quality standards
Choose a factory that adheres to industry standards and certifications to ensure product safety and quality
05
The application scenarios of high-voltage optocouplers include
Power electronic equipment: In high-voltage power systems, it is used to isolate control circuits and main circuits to protect electronic equipment on the low-voltage side from electrical interference on the high-voltage side.
Communication and control system: In communication and control systems that require electrical isolation, it is used to transmit digital or analog signals to prevent noise and interference.
Medical equipment: In medical equipment, the circuit used to isolate patients from medical equipment to ensure patient safety.
Automotive electronics: In automotive electronic systems, it is used to isolate different subsystems to improve system reliability and safety
The main parameters of high-voltage optocouplers
Working voltage: This is the voltage range that optocouplers can operate safely, usually including the voltage on the input and output sides.
Isolation voltage: This is the electrical isolation capability that optocouplers can provide, usually expressed as withstand voltage (Vrms) or isolation resistance (MOhm).
Current Transfer Ratio (CTR): This is the ratio of the current of the input side LED to the collector current of the output side phototransistor, and is an important parameter for measuring the efficiency of optocouplers.
Propagation delay time: This is the time from when the input side LED receives current to when the output side phototransistor begins to conduct, usually including rise time and fall time.
Input current: This is the current required to make the LED emit light, usually represented as the typical and maximum values.
Output current: This is the maximum current that a phototransistor can withstand, usually expressed as collector current (IC).
Working temperature range: This is the ambient temperature range within which the optocoupler can operate normally.
Lifetime: This is the expected lifespan of an optocoupler under normal usage conditions, usually expressed in hours.
Packaging type: This is the physical form of optocoupler, such as DIP, SOP, SOIC, etc
Our Factory
Founded in 2004, Lighting Ltd. specializes in the packaging of medium- and high-power LED devices for lighting; and moved its factory to Fujian Hutou Optoelectronic Industrial Park in 2017.
In Fujian, we have more than 25,000 square meters of factory buildings and more than 20,000 square meters of ultra-clean, anti-static modern dust-free workshop.
Passed IATF16949, ISO9001, ISO14001, ISO45001 (OHSAS18001) quality management system certification.
Semiconductor packaging business since 2015; own optocoupler brand in 2018; optical sensor product line in 2020; integrated class packaging product line in 2021.
Dozens of invention and utility model patents, many authorized patents.
Responding to the strategic goal of China Chip: cooperating with domestic mainstream brands to actively create integrated products made in China.
Our Factory
Product Certifications: ROHS, Reach, VDE, CQC, UL, IATF16949, ISO9001, ISO14001, ISO45001
FAQ
Q: Working principle of high-voltage optocoupler？
A: The working principle of high-voltage optocouplers is similar to other types of optocouplers, both based on the principle of photoelectric effect. Specifically, the working process of the high-voltage optocoupler is as follows: Input side: When the LED on the input side receives current, it will emit light. The intensity of this light is directly proportional to the input current. Isolation layer: Light passes through an optical isolation layer, which is usually air or a special insulation material that can prevent current from passing through, but allows light to pass through. Output side: Light shines on the photodetector (such as a phototransistor or photodiode) on the output side, causing it to generate current. The magnitude of this current is directly proportional to the intensity of the light on the input side. Signal transmission: After amplification and processing, the current on the output side can be used to drive the load or transmit signals. During this process, there is no direct electrical connection between the input and output sides, but signal transmission is carried out through light. This achieves electrical isolation and enables safe signal transmission in high-voltage environments. It should be noted that both the input and output sides of the high-voltage optocoupler require independent power supply because they are isolated and cannot share the same power supply. In addition, the current transfer ratio (CTR) of the input and output sides of high-voltage optocouplers may be affected by factors such as temperature and aging, so these factors need to be considered in practical applications
As one of the leading high voltage transistor optocoupler suppliers in China, we warmly welcome you to buy discount high voltage transistor optocoupler from our factory. All customized products are with high quality and competitive price. For quotation and free sample, contact us now.
for PC852, DIP 4 High Voltage Transistor, for TLP628