SU1233125A1 - D.c.voltage stabilizer - Google Patents

Abstract

The invention relates to the field of stabilized power sources. The aim of the invention is to increase the stability of the output voltage as the load current changes. This is achieved by the fact that the stabilization functions and the setting of the output voltage in the stabilizer are separated. The voltage value is set by the voltage divider 6, and its stability is determined by the inverter made on the key 5 and load 4 transistors. The voltage divider 6 together with the repeater 11 intersects a reference voltage at the source of the transistor 5. The output voltage of the device is larger than the reference voltage and approximately equal to the output voltage of the divider. 1 il. s (c

Description

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The invention relates to electrical engineering and can be used to create integrated circuits on field-effect transistors (MOS).

The purpose of the invention is to increase the output voltage stability when the load current changes.

The drawing shows a schematic diagram of a constant voltage regulator.

The stabilizer contains an output field-effect transistor 1j whose drain is connected to the power line 2, and a source to an output 3 of the device, a load field-effect transistor 4, the drain of which is connected to the power bus, a key field-effect transistor 5, the gate of which is connected to the source of the output transistor, and the drain is with the load source and gate of the output transistors, voltage divider 6, consisting of the first 7, second 8 and third 9 field-effect transistors connected in series and connected between the power supply bus 2 and common bus 10, repeater 11 eg containing a control field-effect transistor 12, the drain of which is connected to the power supply bus 2, and a gate to the output 13 of the voltage divider 6 and a current-setting field transistor 14, the drain of which is connected to the source of the control 12 and the source of the key 5 transistors, and the source with a common bus 10.

The stabilizer works as follows.

The functions of stabilization and setting the output voltage in the proposed device, unlike the known, are separated. The magnitude of the output voltage is set by the voltage divider 6, and its stability is

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Defines an inverter, made on the key 5 and load 4 transistors. The voltage divider 6 together with the voltage follower 11 produces at the source of the key transistor 5 a reference voltage, the value of which is lower than the output voltage of the divider by the amount of the opening voltage of the transistor 12. The output voltage of the device is greater than the reference voltage of the same value and approximately equal to the output voltage of the divider. .

The output voltage of the device is stabilized in the following way.

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With a significant increase in the load current, the value of the output voltage decreases slightly. This means that the input voltage of the inverter, equal to the difference between the output voltage of the device and the reference voltage, also slightly decreases. And since the gain of the inverter voltage is high, the voltage at the output of the inverter, and hence at the gate of the output transistor 1, increases significantly. This significantly increases the conductivity of the output transistor 1, thus providing a significant increase in the load current with a significant decrease in the voltage at the output 3 of the device. Similarly, stabilization occurs when the load decreases.

So, due to the introduction of a voltage divider and voltage repeater into the voltage regulator, which produce the reference voltage, the voltage stability at the output of the device when the load current changes significantly. For example, when changing the load current by 10 times, the change in output voltage does not exceed 1%.

Claims (1)

Invention Formula A voltage regulator, containing an output field-effect transistor, the drain of which is connected to the power bus, and the source is connected to the output terminal, a load field-effect transistor, the drain of which is connected to the power bus, and a key field transistor, iTop, whose gate is connected to the output source transistor, and the drain - with the load source and gate of the transistor transistor, which differs with the fact that, in order to increase the stability of the output voltage when the load current changes, a voltage divider consisting of the first is introduced into it orogo and third FETs are connected sequentially and connected between schinoy power and common bus, and a voltage follower composed of the control FET and current: ozadayuschego FET, the gate control tranzis3 12331254 The torus is connected to the output of the splitter divider and the drain of the current supply transponder, the drain to the power rail, the resistor whose source is connected to the source, to the source of the key trunk bus.