Stabilization of high voltages using low-voltage silicon zener diodes. Encyclopedia of radio electronics and electrical engineering

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Using a low-voltage silicon zener diode as a voltage reference, a stabilized high-voltage power supply can be designed. The output voltage of such a power supply is regulated within 50-250 V, while the stabilization coefficient is 0,5%. The use of this scheme is advisable, for example, in the case when there are no positive and negative supply voltages required for operational amplifiers.

Silicon zener diode D1 forms the reference voltage. The zener diode current is selected according to the specified temperature coefficient and maximum output current. By using FET Q1, resistors R1 and R2 can be high-ohm and low-power, resulting in less shunting of the output voltage. In the case of connecting these resistors directly to the base of the transistor Q2, the stabilization coefficient of the circuit worsens and the output resistance varies widely, which is explained by the low input resistance of the transistor Q2.

The output voltage of the stabilizer can be written as

The open-loop gain of transistor Q2 is 67 dB and depends on the transconductance of the FET and on the load resistance. The feedback coefficient in the regulator circuit is equal to:

where R2=9R1.

The closed-loop voltage gain is 20 dB and is given by:

Then the gain with a closed feedback loop can be written as

Author: N.Coers; Publication: N. Bolshakov, rf.atnn.ru

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