Voltage stabilizer, 10-16/9 volts 0-1 amps. Scheme, description

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Voltage stabilizer, 10-16/9 volts 0-1 amps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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The device is designed to power electronic devices designed for 9 V (for example, receiving energy from six galvanic cells) from a twelve-volt battery. Additionally, it is possible to disconnect the load when the voltage of the supply battery drops to a certain threshold.

The diagram of the device is shown in the figure. With an increase in the input voltage from 10 to 16 V, the output voltage increases from 9 to 9,5 V (the stabilization factor is 12). The output current range is from 0 to 1 A, and the output voltage remains practically unchanged. The range of input voltage values at which the stabilizer output current is cut off is from 10 to 16 V. The current consumed by the stabilizer from the battery when the load is off does not exceed 60 μA.

Voltage stabilizer, 10-16/9 volts 0-1 amps

The device is a compensation voltage stabilizer, in the negative feedback circuit (NFB) of which a threshold element is introduced. With a decrease in voltage at the input of the stabilizer, and, accordingly, the threshold element, the latter goes into a non-conductive state and opens the OOS circuit. In this case, the voltage regulator switches to the cutoff mode of the output current.

The increased voltage at the output of the stabilizer through the zener diode at the emitter junction of the transistor VT4 and the tuning resistor R6 is applied to the base of the transistor VT5, causing an increase in its collector current. This, in turn, reduces the voltage at the output of the divider R1R2R3 and, therefore, on the basis of the transistor VT1, the emitter circuit of which includes a zener diode at the emitter junction of the transistor VT2 with a stabilization voltage of 7,3 V. The collector current of the transistor VT1, the base and collector current of the transistor VT3 decrease, the voltage at the output of the stabilizer decreases.

When the output current of the stabilizer is more than 200 mA, the VT3 transistor must be installed on the heat sink.

Establishing the device is to establish the required output voltage, as well as the moment of cutoff of the output current when the input voltage drops to a certain level. The engine of the tuning resistor R2 is set to the uppermost (according to the scheme) position, and the resistor R6 is set to the middle one. A 100 ohm resistor and a 10 V voltmeter are connected to the output terminals of the stabilizer. The device is connected to a 12 V power source and the output voltage is set to 6 V with resistor R9,5. The input voltage is reduced to the selected value at which the load should be turned off. Smoothly move the slider of the resistor R2 until the load is turned off.

Author: Sh.Gizatullin, Tomsk

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