Purchase Criteria: Four Notes For Mobile DVR

    The past two years, appeared on the market a wide range of variety HDD Mobile DVR (CarDVR)As traditional embedded DVR market segments,Car DVR (Car DVR's definition)Many security companies also ushered in the pro-Lai.

Car DVR Four questions

Car DVR in the security industry say is not really a new product of the times, but said the technical content, we might have actually done Car DVR people can be realized.

One, Car DVR DVR with the ordinary What's the difference?

Common DVR use220VAlternating current, the stability of the voltage and current are relatively stable, and later due to the fixed position of ordinary DVR environment, relatively little chance of vibration, so the ordinary seismic DVR functions can be negligible. However Car DVR is different. First of all, the car's voltage and current can not be understood according to conventional thinking, the car's voltage12 / 24V, But in fact,12VThe car is impossible12VRegulated,24VAlso the same, so it is important to design the power supply board, power board is designed to take into account many aspects.

Second, Car DVR how to design a power supply?

To ensure Car DVR is working properly, we must first ensure stable output power supply board.

Narrow voltage at a fixed environment, due to the input voltage and current basically stable, moreover in terms of the electrical output power determine the input power, so the power in the ordinary DVR can only require an adapter, an adapter is nothing less than a transformer plus a filter circuit, plus a little bit of conscience protection circuit protection circuit heartless not loaded, cheap thing, so the ordinary DVR costs and maintenance costs are relatively low.

But for Car DVR, the first thing to do is dynamic voltage and current narrowing refinement. How to ensure the normal operation of the vehicle-mounted DVR stable voltage and current is very important, but on the other hand, the input power of the device is fixed, byW = U * IShows that the voltage change when the current is changing, with the current direction of the voltage change is always the opposite. So if you start doing the voltage is low, relative to the starting current will increase. The macro is so simple, but it can do this function stability and ensure the normal operation of the device, it may require a trip from the city, the first is designed to protect the circuit, to know the power board Car DVR1Within hours, hundreds of times to withstand the impact, the protection circuit to do well, ranging from the power board is damaged, while the direct breakdown of the power supply board burnt motherboard.

Third, Car DVR how seismic design?

Seismic Design Car DVR is very important, that white is actually how to protect the hard disk. Because current hard disk is mechanical shaft drives, only a few micrometers away from the head and the disk, if the naked eye, the head is attached to the disk, but even if you do not understand the hard disk you should understand,5400Hard to be rotated at least every second turn90Second, if the head is attached to the top, and before long, grinding head was gone. So close, if seismic done, as long as there are so head wobbling a little, ranging from hard disk damage, while a head crash(Hard terms). So hardware earthquake is very important.

Fourth, Car DVR hard drive how to design fault-tolerant error correction?

A: The hard disk fault-tolerant error correction capability is hard since there both inITHardware industry, or the software industry has sought a puzzle to solve. For an embedded system, you want to do perfect design fault-tolerant error correction, it is difficult!But for embedded system design intent in terms of: embedded system has always been to pursue better stability and speed of execution and design, but there is a problem can not be ignored is that portability is poor, resulting in a design once it is impossible to have too big changes. So it is important to first design ideas. Fault-tolerant embedded systems for hard disk error correction, the current effective way is to read and write control. 

    Shenzhen Richmor Technology & Development Co., Ltd. specialized in vehicle monitoring equipment research and development, production and sales, experienced, first-class production technology, advanced production equipment, its automotive products are exported abroad. Look forward to working with you to create brilliant.