● Design of shielding and signal ground
In the fuel cell electric vehicles, high power DC / DC converters and other control circuits, motor controllers and other equipment placed together between Yao radiated electromagnetic energy, usually associated with the shield and shell mode gap shield for protection against radiation suppress interference. In addition, the mass signal eliminates the outside world or other equipment with high VEGF power DC / DC interference, the key is to choose an appropriate reference point for the circuit and line grounded in sound public distribution. Dell Inspiron 1525 battery Dell Vostro 1520 battery
High Power DC / DC converter control circuit anti-jamming design
Control circuitry is the high power DC / DC are an important component of good design advice can significantly improve the immunity of the circuit.
High Power DC / DC converter control circuit mainly by the power supply, the sampling of signals, communication signals and the driver modules, to avoid interference between signals in the circuit design at its isolation, as shown.
VEGF in high power DC / DC converter control circuit, the power module is commonly used in isolated DC / DC module, realized the power of entry and exit of electrical insulation. isolation of the sampling signal, including the isolation and the isolation voltage of sample collection. Communication signals using optical couplers HCPL0600 isolation to reach the entrance of the CAN bus and output signals of the optical isolation. VEGF with DC / DC converter output is bigger, so that using IGBT power switch and IGBT drivers with different specifications for different methods of isolation. General IGBT driver with low power isolation TLP250, medium-power IGBT drive for a more EXB841/840 Series modules driver isolation, high power IGBT modules or ultra-high power may be used to achieve the 2SD315A drive isolation. Practice shows that the isolation of each functional module, the control circuit can be greatly reduced interference between the different modules to ensure the reliability of signal transmission and signal processing precision. Dell Latitude D610 battery Dell Inspiron E1405 battery
High Power DC / DC converter design software interference
High Power DC / DC converters are usually controlled by DSP, the anti-jamming design software is also very important. High Power DC / DC conversion software interference of two main aspects to consider: DSP technology for filtering interference immunity and Software Technology, the first is mainly due to the interference against the procedure because “run off”, which is primarily to eliminate the signal interference to improve system accuracy.
DSP technology, anti-jamming
VEGF in high power DC / DC converter operation, once the interference DSP control system will have very serious consequences, even make the system of fuel cell electric vehicles paralyzed, so when designing the real system, are considered as interference occurs, the DSP system against its own measures. Dell Vostro 1220 battery Dell Vostro 1220n battery
To improve the immunity of DSP, the new DSP controller (as TMS320LF2407A) module integrates a watchdog timer (WDT), used to run the monitoring program is a combination of hardware and software procedures for managing anti Fly-measures. WDT is used to generate the material of the main cons or timer trigger monostable T, the counter or trigger basic single autonomous and stable, termination synchronization output line reset the DSP and time allowed by the DSP control software.
Under normal circumstances, the program began after the WDT, and in some time, the time T reset to clear, so the timing WDT overflow will not occur because no effect of sleep normally. Interference of Yichang in the context of the situation, the destruction of temporal logic processor implementation of the program, chaos, Bu Keneng WDT cleared periodically, Zhe Yang a time when the WDT overflows, the output reset Shi Ji Tong DSP processor Baituo Yin Er in a temporary disruption paralysis. dell inspiron 2600 battery dell inspiron 2650 battery
Antispyware
In this article, a filtering technology VEGF high processing power DC / DC sampling data. High Power DC / DC converter will be collected using the analog controller filtered sent to DSP A / D converter channel, launched by the software programming / D conversion, to obtain the value of the sample A / D integrated in the register in.
DSP signal interference Duocheng around the shape of burrs, a relatively short duration of action. Sampling of the analog DSP, it can be repeated on the same analog A / D conversion, and several times the value of temporary storage in the sampling area of internal data. After repeated sampling when using data filtering algorithm and multiple methods of sampling the average value of data processing software that can improve the fight against-interference, improve data accuracy and sampling accuracy. dell inspiron 1520 battery dell inspiron 1521 battery
Conclusion
In this paper, high power DC / DC converter and the main sources of interference suppression measures to control the electromagnetic signal circuit isolation and design software to interference VEGF high power DC / DC compatibility electromagnetic study and an effective solution to the VEGF high power DC / DC EMI. With EMC Design VEGF high power DC / DC converter has been applied successfully developed by Tsinghua University, the fuel cell buses, technical indicators are used to meet the vehicle requirements, works well. dell inspiron 1720 battery dell inspiron 1721 battery