電子信息工程-外文翻譯-文庫吧資料
2025-06-06 08:43本頁面
【正文】 wer device, it will be able to play the role of temperature instructions. When the power control the temperature of the shell or the internal device temperature exceeds the allowed value, the heat conduction thyristor on, so that LED warning light. If the optocoupler with, would enable the whole circuit alarm action to protect the switching regulator. It can also be used as a power transistor as the overtemperature protection, crystal switch the base current by ntype gate control thyristor TT201 thermal bypass, cutoff switch to cut off the collector current to prevent overheating.直流開關(guān)穩(wěn)壓電源的保護(hù)技術(shù)直流開關(guān)穩(wěn)壓器中所使用的大功率開關(guān)器件價(jià)格較貴,其控制電路亦比較復(fù)雜,另外,開關(guān)穩(wěn)壓器的負(fù)載一般都是用大量的集成化程度很高的器件安裝的電子系統(tǒng)。s input overvoltage protection, including overvoltage protection and output overvoltage protection. Switching regulator is not used in DC power supply voltage regulator and rectifier, such as battery voltage, if too high, so switching regulator is not working properly, or even damage to internal devices, therefore, it is necessary to use the input overvoltage protection circuit. Using transistors and relays protection circuit.In the circuit, when the input DC power supply voltage higher than the voltage regulator diode breakdown voltage value, the breakdown voltage regulator tube, a current flowing through resistor R, so that V turnon transistor, relay, normally closed contact off open, cut off the input. Voltage regulator voltage regulator which controls the value of Vz = ESrmaxUBE. The polarity of input power with the input protection circuit can be bined with overvoltage protection, polarity protection constitute a differential circuit and overvoltage protection. Output overvoltage protection switching power supply is essential. In particular, for the 5V output of the switching regulator, it is a lot of load on a high level of integration of the logic device. If at work, switching regulator sudden damage to the switch transistor, the output potential may be increased immediately to the importation of nonregulated DC power supply voltage value, causing great loss instantaneous. Commonly used method is shortcircuit protection thyristor. The simplest overvoltage protection circuit. When the output voltage is too high, the regulator tube breakdown triggered thyristor turnon, the output shortcircuit, resulting in overcurrent through the fuse or circuit protective device to cut off the input to protect the load. This circuit is equivalent to the response time of the opening time of thyristor is about 5 ~ 10μs. The disadvantage is that its action is fixed voltage, temperature coefficient, and action points of instability. In addition, there is a voltage regulator control parameters of the discrete, model overvoltage startup the same but has different values, difficult to debug. Esc a sudden increase in output voltage, transistors V1, V2 conduction, the thyristor conduction. Reference voltage Vz by type.Output voltage below the value to reflect the input DC pow
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1