Electronic dc voltage stabiliser

FIELD: electricity.

SUBSTANCE: electronic stabiliser comprises a ballast resistor connected in series to the load and a regulating element based on two series-connected transistors, feedback divider and voltage rectifying divider, all of them connected in parallel to the load, at that one arm of the feedback divider is made as in series stabilitrons and resistor, the centre tap of the feedback divider is connected to input of the first transistor while the centre tap of the rectifying divider is connected to input of the second transistor.

EFFECT: higher reliability of the stabiliser.

1 dwg

 

The invention relates to electronics and can be used in the secondary power supply apparatus for various purposes, in particular, to systems power grid modulators for microwave devices.

Known electronic voltage regulators connected in parallel with the load regulating element.

And. And. the Belopolsky "power radio". M.: "Energy" (1971), S. 233, Fig.9-18.

For high voltage systems usually cannot build a regulatory element of a single transistor. You must use the serial included in the regulatory element of the two or more transistors, which adds cost and complexity to the schema.

CBS O. A. "the Amplifier transistors in the switching mode". M: Energy, 1971, S. 99-406.

Ibid page 106 of Fig.5.

Known technical solutions the closest prototype is the regulatory unit of voltage stabilizer in two series-connected transistors.

Auth. testimony SU # A CL G05F 1/58, published 07.06.83, bull. No. 21.

The known device comprises a ballast load, the voltage divider resistors, the differential amplifier transistors connected in series regulating element, a source of voltage, a control node connected to its inputs divider output voltage is agenia resistors and a voltage reference, as well as the load. The device contains several functionally auxiliary nodes of the differential amplifier, the feedback amplifier, the source voltage). That is, the task of managing two series regulating transistors resolved quite complex means and for high-voltage power sources, especially under high potential, this device does not provide sufficient reliability, which is a serious disadvantage of the prototype.

The objective of the invention is to improve the reliability of the stabilizer, control element which consists of two series-connected transistors, by simplifying the circuit and minimize the number of active elements.

The solution lies in the fact that one shoulder divider feedback (DOS) introduced several Zener diodes (movs) connected in series with a resistor. To the entrance of one of the regulating transistor connected to the middle pin between the equalizing resistors of the voltage divider, and to the input of the other transistor connected to the middle pin between the resistors DOS. (Fig.1). The average output is the connection point of the resistors of each of the divider.

1 is a ballast resistor

2, 3 - equalizing resistors of the voltage divider

4, 5 transistors to regulate the ith element

6 - voltage regulator diodes

7, 8 resistors of the feedback divider

9 - load stabilizer

The proposed device consists of a ballast resistor 1, which is included in series with the load 9.

Equalizing the voltage divider made of series-connected resistors 2 and 3 and are connected in parallel to the load 9.

The feedback divider composed of series-connected Zener diodes 6 and resistors 7 and 8, which form the 2 shoulder. The Zener diodes 6 and the resistor 7 form one shoulder DOS, and the other shoulder is the resistor 8. DOS is connected parallel to the load 9.

In parallel with the load 9 also includes two series-connected transistors 4, 5 regulatory element. The connection of the regulating element and levelling the voltage divider and the feedback divider is carried out through the secondary terminals of the dividers and the inputs of the transistors 4 and 5.

To the input of the transistor 4 connected to the middle pin between the resistors 2 and 3, the alignment of the voltage divider and the input of the transistor 5 is connected average output between the resistors 7 and 8 DOS.

Electronic stabilizer works as follows: on input terminals (+E, -E) is non-stabilized voltage, which, through a ballast resistor 1 is supplied to the load 9, the terminals of which are connected in parallel to three of the functionality is lnyh element:

leveling divider resistors 2, 3;

the regulatory element of the transistors 4, 5;

the feedback divider - Zener diodes 6 and the resistors 7, 8.

If the output voltage differs from the set of stable values, the error signal through DOS is delivered directly to the input of the transistor 5, by changing the voltage drop across it, thereby compensating for misalignment. The resistor 7 is variable or pick that allows you to adjust the voltage at the load over a wide range. The voltage drop across the transistor 4 is set by the voltage at its input, i.e. the parameters of the alignment of the divider 2, 3.

The introduction of Zener diodes in one of the shoulders DOS allows almost an order of magnitude increase gain without feedback amplifier.

The number and type Zener diodes (varistor) is determined by the set value of the output voltage of the stabilizer.

Additional advantages of the proposed solution are as follows. In DOS there is no need to use precision resistors; provides sufficient amplification factor of the variable component, i.e., the device operates as an effective filter. In addition, virtually eliminate the possibility of self-excitation in the feedback loop.

The regulatory element may be implemented as a beep is regular, and field-effect transistors. This provides freedom of choice for the implementation of the device.

The proposed scheme ensures the accuracy of the output voltage 0,20,5%. The filtration coefficient is 20.

If you need to provide more in-depth filtering dividers can be added to the capacitive elements.

Electronic constant voltage stabilizer, containing connected in series with the load ballast resistor and in parallel with the load regulating element on two series-connected transistors, the feedback divider and equalizing the voltage divider, wherein the one shoulder of the feedback divider is made of series-connected Zener diodes and a resistor, the average output of the feedback divider connected to the input of one transistor to the input of the second transistor is connected to the middle pin of the alignment of the divider.



 

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