Alan_Martin's author page 2024

Alan_Martin

Followers 0 Following 0

Alan_Martin 2022-04-13

So how do relays work? Main functions(1) Amplification: For example, sensitive relays, intermediate relays, etc. When the coil is energized, the normally closed contact opens and the normally open contact closes, and when the coil is de-energized and released, the normally closed contact and the normally open contact are reset to the initial state. The moving contact and static contact 1 in the closed state, known as normally closed contact, moving contact and static contact 2 in the open state, known as normally open contact. The above is the concept of relays, circuit symbols, the main role, the basic structure and working principle is introduced.

Three functions realized by the NFC module of the mobile phone

Alan_Martin 2021-08-14

The former can be used for bus or access control, and the latter can get rid of the shackles of cables.

It is mainly used as the initial verification of Bluetooth and wireless connections.

Key coil The NFC module on a smartphone usually includes a complete CLF (contactless front-end module), radio frequency antenna, and SE (safe area) units, and the most impressive thing is undoubtedly a striking coil.

Its working principle is based on the mutual coupling of inductances, which regularly changes the impedance of the coil to regularly change the load of the primary coil of the inductance, so as to allow the coil in the reader end (which can be a mobile phone or a bus gate, etc.)

Yes, the wireless charging technology commonly used in mobile phone loops at this stage is based on electromagnetic induction.

Its principle is the Faraday battery induction law, which is to give the primary coil a certain frequency of alternating current and generate a certain current in the secondary coil through electromagnetic induction.

Introduction to Radio Frequency Power Amplifiers (RF PAs)

Alan_Martin 2022-03-15

The radio frequency power amplifier (RF PA) is the main part of the transmission system, and its importance is self-evident. In order to obtain a sufficiently large RF output power, a RF power amplifier must be used. The main technical indicators of the RF power amplifier are output power and efficiency. How to improve the output power and efficiency is the core of the design goal of the RF power amplifier. In terms of performance, CMOS power amplifiers have poor performance in terms of linearity, output power, efficiency, etc.

The Difference between Optical Zoom and Digital Zoom

Alan_Martin 2021-06-23

Friends who are familiar with the lens are not unfamiliar with the concept of focal length. Optical zoom The zoom method we mentioned earlier by changing the focal length of the lens is called optical zoom. Our common 24mm-70mm lens can be changed from 24mm to 70mm at will. We can intuitively see the change of the corresponding scene in the viewfinder. Generally, a zoom lens requires an additional zoom lens group, so it is larger in size and weight than a fixed focus lens. The principle of digital zoom causes serious loss of image quality after zooming.

Fantastic digital circuit design

Alan_Martin 2022-02-08

Schematic diagram Seeing the circuit design diagram below, I don't know how many friends can see the mystery. Given the known conditions Given the known conditions first, there is a starting thought: 1). Guess After seeing the known conditions given above, the following two preliminary conclusions may be drawn: 1). 4-channel Bridge signal output, since it is Bridge or 4-channel, it may be a full-bridge drive PWM signal; 2). The circuit design of the digital part of the "5" block is also the essence of the circuit; after the analysis, I can't help feeling that its design is ingenious, and the designer is definitely a master of digital circuits!

Interpretation of the key components of Autonomous Driving

Alan_Martin 2021-04-21

This article provides a brief and comprehensive overview of the key components of autonomous vehicles (autonomous driving systems), including autonomous driving levels, autonomous vehicle sensors, autonomous vehicle software, open source data sets, industry leaders, autonomous vehicle applications, and ongoing Challenges facing. In the past decade, with a series of breakthroughs in autonomous driving system technology worldwide, the competition for the commercialization of autonomous vehicles (automatic driving systems) has become more intense than ever. Autopilot systemThe autonomous driving system enables the car to operate in a real environment without human driver intervention. Each autonomous driving system consists of two main components: hardware (car sensors and hardware controllers, ie, throttle, brakes, wheels, etc. In addition, when people can truly accept autonomous driving and autonomous vehicles is still a topic worth discussing, which has also led to serious ethical issues.

Difference between ULN2803 and ULN2003

Alan_Martin 2022-01-25

The ULN2003 has a 2. The circuit features the following: Each pair of ULN2003 Darlingtons is connected in series with a 2. The ULN2803 is designed to be compatible with the standard TTL family, while the ULN2804 is best suited for 6 to 15 volt high level CMOS or PMOS. If the control of inductive loads, it is best and a diode at both ends of the inductive load to prevent breakdown ULN2803. The two chips input voltage range is the same, the output voltage, the same current.

How relays work and what they do?