RU2542673C1 - Electronic dc voltage stabiliser - Google Patents

Abstract

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.

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Description

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

Known electronic voltage stabilizers with a regulating element connected in parallel to the load.

I.I. Belopolsky "Power sources for radio devices." M .: "Energy" 1971, p.233, Fig. 9-18.

For high-voltage systems, it is usually not possible to build a control element on a single transistor. It is necessary to use the series connection of two or more transistors in the control element, which complicates and increases the cost of the circuit.

Kosov O.A. "Power amplifier transistors in switching mode." M .: Energy, 1971, pp. 99-406.

Ibid. P. 106 fig. 5.

Of the known technical solutions, the closest prototype is the regulating unit of the voltage regulator on two transistors connected in series.

Auth. Certificate SU No. 1022133A cl. G05F 1/58, published June 7, 83 Bull. No. 21.

The known device contains a ballast load, a voltage divider on the resistors, a differential amplifier, series-connected transistors of the regulating element, an additional voltage source, a control unit with an output voltage divider on the resistors and a reference voltage source connected to its inputs, as well as a load. The device contains several functionally auxiliary nodes (differential amplifier, feedback amplifier, additional voltage source). That is, the task of controlling two series-connected control transistors is solved by rather complicated means and for high-voltage power sources, especially those with high potential, this device does not provide sufficient reliability in operation, which is a serious disadvantage of the prototype.

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

The solution to the problem is that several zener diodes (varistors) connected in series with a resistor are introduced into one shoulder of the feedback divider (DOS). The average output between the resistors of the equalizing voltage divider is connected to the input of one control transistor, and the average output between the DOS resistors is connected to the input of another transistor. (Figure 1). The middle conclusion is the connection point of the resistors of each divider.

1 - ballast resistor

2, 3 - resistors of the equalizing voltage divider

4, 5 - transistors of the regulatory element

6 - zener diodes

7, 8 - feedback divider resistors

9 - stabilizer load

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

The equalizing voltage divider is made of series-connected resistors 2 and 3 and is connected in parallel to the load 9.

The feedback divider consists of series-connected zener diodes 6 and resistors 7 and 8, which form 2 arms. Zener diodes 6 and resistor 7 form one DOS arm, and the other arm constitutes resistor 8. DOS is connected in parallel to load 9.

In parallel with the load 9, two series-connected transistors 4, 5 of the control element are also included. In this case, the connection of the regulating element with the equalizing voltage divider and the feedback divider is carried out through the middle outputs of the dividers and the inputs of transistors 4 and 5.

The average output between the resistors 2 and 3 of the equalizing voltage divider is connected to the input of transistor 4, and the average output between the resistors 7 and 8 of the DOS is connected to the input of transistor 5.

The electronic stabilizer works as follows: an unstabilized voltage is supplied to the input terminals (+ Е, -Е), which, through a ballast resistor 1, is supplied to load 9, to the terminals of which three functional elements are connected in parallel:

leveling divider - resistors 2, 3;

regulatory element - transistors 4, 5;

feedback divider - zener diodes 6 and resistors 7, 8.

If the output voltage differs from the specified stable value, the mismatch signal through the DOS is fed directly to the input of the transistor 5, changing the voltage drop across it, thereby compensating for the mismatch. The resistor 7 is variable or selectable, which allows you to adjust the voltage on the load over a wide range. The voltage drop across the transistor 4 is completely set by the voltage at its input, i.e. the parameters of the equalizing divider 2, 3.

The introduction of zener diodes into one of the arms of the DOS allows increasing its transfer coefficient by almost an order of magnitude and dispensing with a feedback amplifier.

The number and type of zener diodes (varistors) is determined by the specified value of the output voltage of the stabilizer.

Additional advantages of the proposed solutions are as follows. In DOS there is no need to use precision resistors; a sufficient gain in the variable component is provided, i.e. The device works as an effective filter. In addition, the possibility of self-excitation in the feedback ring is practically excluded.

The regulatory element can be made both on bipolar and field-effect transistors. This provides freedom of choice when implementing the device.

The proposed scheme provides an accuracy of maintaining the output voltage of 0.2 ÷ 0.5%. The filter coefficient reaches 20.

If necessary, provide deeper filtration dividers can be supplemented by capacitive elements.

Claims (1)

An electronic DC voltage stabilizer comprising a ballast resistor connected in series with the load and connected in parallel with the load to a regulating element on two series-connected transistors, a feedback divider and an equalizing voltage divider, characterized in that one arm of the feedback divider is made of series-connected zener diodes and a resistor, the average output of the feedback divider is connected to the input of one transistor, the middle is connected to the input of the second transistor output equalizer divider.

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