●8002604406R
●制造商已停產(chǎn)
●電源切換
●10A
●50伏直流電
●輸出:6個3A 20伏直流電

電源開關(guān)里有一扇門，-開門電源就通過, -關(guān)門電源就停止通過,那么什么是門呢，開關(guān)電源里有的采用可控硅,有的采開關(guān)管,這兩個元器件性能差
不多,都是靠基極、 (開關(guān)管) 控制極(可控硅). 上加上脈沖信號來完成導通和截止的，脈沖信號正半周到來，控制極上電壓升高,開關(guān)管或可控硅就導通，由
20v整流、濾波后輸出的300v電壓就導通，通過開關(guān)變壓器傳到次級，再通過變壓比將電壓升高或降低，供各個電路工作。振蕩脈沖負半周到來,電源調(diào)整管的
基極、或可控硅的控制極電壓低于原來的設(shè)置電壓,電源調(diào)整管截止，300v電源被關(guān)斷, 開關(guān)變壓器次級沒電壓,這時各電路所需的工作電壓，就靠次級本路整
后的濾波電容放電來維持。待到下一一個脈沖的周期正半周信號到來時,復(fù)上一 個過程。這個開關(guān)變壓器就叫高頻變壓器, 因為他的工作頻率50hz低頻。那么
準動開關(guān)管或可控硅的脈沖如何獲得呢，這就需要有個振蕩電路產(chǎn)生,我們知道，晶體三極管有個特性,就是基極對發(fā)射極電壓是0.65-0.7v是放大狀態(tài), 0.7v以
上就是飽和導通狀態(tài)，-0.1v–0.3v就工作在振蕩狀態(tài)， 那么其工作點調(diào)好后,就靠較深的負反饋來產(chǎn)生負壓,使振蕩管起振，振蕩管的頻率由基極上的電容充放
電的時間長短來決定，振蕩頻率高輸出脈沖幅度就大,反之就小，這就決定了電源調(diào)整管的輸出電壓的大小。那么變壓器次級輸出的工作電壓如何穩(wěn)壓呢，一 般
在開關(guān)變壓器上,單繞-組線圈，在其上端獲得的電壓經(jīng)過整流濾波后,作為基準電壓,然后通過光電耦合器,將這個基準電壓返回振蕩管的基極,來調(diào)整震
蕩頻率的高低，如果變壓器次級電壓升高,本取樣線圈輸出的電壓也升高,通過光電耦合器獲得的正反饋電壓也升高,這個電壓加到振蕩管基極上,就使振蕩頻
率降低，起到了穩(wěn)定次級輸出電壓的穩(wěn)定

80026-044-06-R

80026-044-06-R

●8002604406R
● The manufacturer has ceased production
● Power Switch
●10A
●50 volts direct current
● Output :6 3A 20V DC
There is a door in the power switch, – open the power supply through, – close the power supply to stop through, so what is the door, some use thyristor in the switching power supply, some use the switching tube, the performance of these two components is poor
Not much, all rely on the base, (switching tube) control pole (thyristor). Add a pulse signal to complete the conduction and cut-off, the pulse signal is half a week to come, the voltage on the control pole rises, the switching tube or thyristor is switched on, by
After 20v rectification and filtering, the output 300v voltage is switched on, transmitted to the secondary through the switching transformer, and then the voltage is increased or decreased through the transformer ratio for each circuit to work. Oscillating pulse negative half week to come, power adjustment tube
The base, or the control pole voltage of the thyristor is lower than the original setting voltage, the power regulation tube is cut off, the 300v power supply is turned off, the switching transformer has no secondary voltage, and the working voltage required by each circuit is adjusted by the secondary local circuit
After the filter capacitor is discharged to maintain. When the next pulse’s periodic positive half-cycle signal arrives, a process is resumed. This switching transformer is called a high-frequency transformer, because its working frequency is 50hz low frequency. In that way
How to obtain the pulse of the quasi-moving switching tube or thyristor, which requires an oscillation circuit to produce, we know that the transistor has a characteristic, that is, the base to the emitter voltage is 0.65-0.7v is an amplified state, 0.7v to
The above is the saturated conduction state, -0.1v–0.3v is working in the oscillation state, then the working point is adjusted, and the negative pressure is generated by deep negative feedback, so that the oscillation tube is vibrating, and the frequency of the oscillation tube is charged and discharged by the capacitor on the base
To determine the length of the electric time, the oscillation frequency is high and the output pulse amplitude is large, and the reverse is small, which determines the output voltage of the power supply adjustment tube. So how to regulate the working voltage of the transformer secondary output, a general
On the switching transformer, the voltage obtained at the upper end of the single-wound coil is rectified and filtered, and then the reference voltage is returned to the base of the oscillation tube through the photoelectric coupler to adjust the shock
If the transformer secondary voltage increases, the output voltage of the sampling coil also increases, and the positive feedback voltage obtained through the photoelectric coupler also increases. This voltage is added to the base of the oscillation tube to make the oscillation frequency
The rate is reduced to stabilize the secondary output voltage

80026-044-06-R