SU584406A1 - Parametric voltage regulator - Google Patents

Description

(54) PARAMETRIC VOLTAGE STABILIZER

I

The invention relates to a technique of multichannel telecommunications and can be used in telephone channel modems, for example, with pulse code modulation (PCM).

A parametric voltage regulator, made on transistors with bias resistors, is known. Its disadvantage is the low stability of the output signal.

Also known is a parametric voltage regulator containing a zener and two transistors with additional symmetry and collector-base connections, the emitter of one of which is connected through a resistor with a common bus, and the emitter of the other is connected to a power source, one output of the zener diode connected to the output of the device and the other to common bus 2. A disadvantage of the known device is the low stability of the output voltage.

In order to increase the stability of the output voltage. The proposed parametric voltage regulator introduces two additional transistors of different conductivity types, the base and collector of each additional transistor are connected respectively to the base of the main transistor of the same type of conductivity and the emitter of the main transistor of the opposite conductivity, and the emitter of the additional transistor , the collector circuit of which is connected to the common length, is connected via a resistor to the power source, and An another additional transistor is connected to the output of the device.

The drawing shows a diagram of the proposed device.

The device consists of two pass-through transistors 1 and 2 of anti-pole conduction type with current-setting resistors 3 and 4 and with a counter-parallel connection of base-to-collector junctions. Between the collector and the emitter of the pass-through transistor 1 of the pnp type, a negative feedback circuit is formed, formed by the transistor 5 of the wool type, the emitter of which is connected to the bias resistor 6. Between the collector and the emitter of the pass-through transistor 2 A negative feedback circuit is included, formed by a pn-type transistor 7, the emitter of which is connected to the zener diode 8.

The device works as follows.

Claims (2)

After switching on the device, the voltage on the current-supplying resistor 3 is equal to the breakdown voltage of the Zener diode 8, since the voltage drop at the base-emitter junction of the pass-through transistor 1 is compensated by the voltage drop at the base-emitter junction of the negative transistor 7. The current flowing through the resistor 3 is stabilized. The transistor 1 sets the required base current to the negative-feedback transistor 5. In this case, the emitter current of transistor 5 flowing through resistor 6 is almost equal to the stabilized current flowing through resistor 3. The voltage drop across resistor 6 is also stabilized. The voltage across the resistor 4 is equal to the voltage drop across the bias resistor 6, because the voltage drop at the base-emitter junction of transistor 2 is compensated for by the voltage drop at the base-emitter junction of transistor 5. The current flowing through the current-setting resistor 4 is stabilized. The pass-through transistor 2 sets the required base current to the transistor 7. At the same time, the emitter current of the transistor 7, set in the Zener diode 8, is almost equal to the stabilized current flowing through the resistor 4. Invention Parametric voltage regulator containing a Zener diode and two additional symmetries and basic connections, the emitter of one of which is connected through a resistor with a common bus, and the emitter of the other with a power source, with one output of the Zener diode connected to the output of devices and the other to a common bus, characterized in that, in order to increase the output voltage stability, two additional transistors of different conductivity types are introduced into the device, the base and the collector of each additional transistor are connected respectively to the base of the main transistor of identical conductivity type and to the emitter of the main transistor transistor of the opposite conductivity type, the emitter of the additional transistor, the collector circuit of which is connected to the common bus, is connected via a resistor to the power source, and Itter another additional transistor connected to the output device. Sources of information taken into account in the examination 1. Shtilman V. I. Microelectronic voltage regulators. Ed. “Technique, Kiev, 1976, p. 86, fig. 21st. 2. USSR author's certificate №513487, cl. H OZK 7/10, 1974.