An analogue of a high-voltage zener diode. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power supply
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In the absence of KS620A, KS630A, KS650A, KS680A zener diodes, you can use their analogue, assembled according to the diagram shown in the figure.
The device is fully equivalent to the zener diodes of the specified series and can be used without any modifications. Its stabilization voltage is 120 ... 180 V (depending on the instance of the VD1 diode), the values \u0,1b\u20bof the minimum and maximum stabilization currents are 500 and 550 mA, respectively, the differential resistance is XNUMX ... XNUMX Ohms.
As a source of stable current in the device, diodes D219A, D220, D220A should be used, which have low differential resistance at a reverse voltage of 120 ... 180 V and a reverse current of 0,1 ... 10 mA. Transistor VT1 is a stabilization current amplifier, it reduces the differential resistance. With a stabilization current of more than 6 mA, it must be equipped with a heat sink.
In addition to that indicated in the diagram, you can use the KT604B transistor or any other transistor with the appropriate allowable voltage between the collector and emitter and power dissipation. The required stabilization voltage is set by selecting the VD1 diode.
Author: I.Gorbachev, Zaporozhye; Publication: N. Bolshakov, rf.atnn.ru
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