SU767734A1 - D-c voltage pulse stabilizer - Google Patents

Description

The invention relates to electronics and automation and can be used as a secondary power source.

Known pulse voltage regulators DC [1], [21 and [3].

The closest in technical essence ⁵ to the proposed one is a pulse stabilizer containing a power transistor, a choke connected through a diode parallel to the output of the stabilizer, an output capacitor, a pulse-width modulator, the output of which is connected to a power transistor, and the input is connected to the output of the stabilizer, a reference voltage source, and a shaper sawtooth voltage, connected to a source of rectangular pulses of stable amplitude [3].

The disadvantage of this stabilizer is the limited accuracy of the output voltage when the input voltage changes over a wide range. 20

The purpose of the invention is to ensure the invariance of the output voltage with respect to the input, which can significantly improve the accuracy of the voltage regulator.

This goal is achieved in that the power output of the sawtooth voltage former is connected through the first resistor to the input of the stabilizer and through the second resistor to the output of the stabilizer.

The amplitude of the sawtooth voltage is proportional to the sum of the input and output voltages, which allows the stabilizer to be invariant with respect to the input voltage.

The drawing shows a diagram of a pulse stabilizer.

The stabilizer consists of a control transistor 1, a reactor 2 connected through a switching diode 3 in parallel with the output of the stabilizer, an output capacitor 4, a pulse-width modulator 5, the output of which is connected to the base of the control transistor 1, and the inputs are connected to the output terminals of the reference voltage source 6 and the driver 7 sawtooth voltage.

The power output of the sawtooth voltage former 7 is connected through the first rezne3 767734 torus 8 and through the second resistor 9 with the input and output terminals, respectively.

The stabilizer works as follows. During the open state of the control transistor 1, the inductor 2 stores the electromagnetic energy that it gives off to the capacitor 4 when the transistor is turned off.

The output voltage of the stabilizer is determined by the following relation, and - and ^and out - r ~ - ^and in or ^ out ⁼ + and _{V out} ) * Ϊ

The pulse-width modulator 5 forms the relative duration of the control pulses of 15 pulses according to the law:

w _3r L _ ЧбШУ. K ₁ *% U _n

Therefore, ²⁰ and. ^ 6 "

8ΛΙΧ

Connecting the power supply output of the sawtooth generator 7 by resistors 8 and 9 to the input and output of the stabilizer makes the amplitude of the sawtooth voltage Un dependent ^on U _B x and _output .

If the resistors 8 and 9 are of equal ^magnitude, then schh) ·

Then

U ----- н ^6ЫХ ~ ^к г ^{+ К} 1 ° 'where U _in and _out are the input and output voltage of the stabilizer;

U _o - voltage source reference

- voltage;

j is the relative duration of the control pulses;

£ - mismatch signal of the output and reference voltages; _4J

U _n is the amplitude of the sawtooth voltage;

To | - transmission coefficient of the pulse width modulator; 'Kg - transmission coefficient of the sawtooth voltage shaper according to the supply voltage ..

Thus, the output voltage of the stabilizer is independent of changes in input. The invariance of the output voltage with respect to the input (when choosing the appropriate transmission coefficients) can significantly increase the accuracy of the stabilizer.

Claims (3)

The invention relates to electronics and automation and can be used as a secondary power source. Pulse voltage regulators of direct current 1, 2J and 3 are known. The closest in technical essence to the proposed is a pulse stabilizer containing a power transistor, a drosel connected through a diode in parallel with the output of the stabilizer, an output capacitor, a pulse width modulator whose output It is connected to an aiyu transistor, and the input is connected to the output of a stabilizer, a reference voltage source and a sawtooth voltage driver, connected to a source of rectangular pulses of stable amplitude 3. Under remnants of the stabilizer is limited accuracy of the output voltage when the input voltage in the range ishroko. The purpose of the invention is to ensure the invariance of the output voltage with respect to the input voltage, which allows to significantly improve the accuracy of the voltage regulator. The goal is achieved in that the power output of the sawtooth driver is connected via the first resistor to the stabilizer input and through the second resistor to the stabilizer output. In this case, the amplitude of the sawtooth voltage is proportional to the sum of the input and output voltages, which allows the stabilizer to be invariant with respect to the input voltage. The drawing shows a diagram of a pulsed hundred & schizators. The stabilizer consists of the regulating transistor 1, drossel 2, connected via switching diode 3 parallel to the output of the stabilizer, the output capacitor 4, the pulmonary pulser modulator 5, the output of which is connected to the base of the regulating transistor 1, groom and shaper 7 sawtooth. The power supply terminal of the driver 7 of the saw-tooth voltage is connected via the first inductor 8 and through the second resistor 9, respectively, to the input terminal of the output terminal sh. The stabilizer works as follows. During the open state of the regulating transistor 1, the inductor 2 stores the electromagnetic power, which is given to the capacitor 4 when the transistor is locked. The output voltage of the stabilizer is determined by the following relationship L out (UBX t and out) “Pulse Width Modulator 5 forming the relative duration of the control pulses according to the law:. Up-Ue, m 0nUn Connecting the power supply pin of the generator 7 of the sawtooth voltage by resistors 8 and 9 to the input and output of the stabilizer makes the amplitude of the sawtooth voltage n from UBX and the output voltage dependent. l, 1yy.) -, and .i | out- 0 | where and in, UBMX is the input and output voltage of the stabilizer; UQ is the voltage source of the reference voltage; j is the relative duration of the control pulses; t is the error signal of the output and reference voltages Uj — the amplitude of the sawtooth voltage; K | - transmission coefficient of a pulse width modulator; Kj is the transfer ratio of the sawtooth voltage driver over the supply voltage. Thus, the output voltage of the stabilizer is independent of the change in the input voltage. The invariance of the output voltage with respect to the input voltage (the choice of the corresponding transfer coefficients) makes it possible to significantly improve the accuracy of the stabilizer. Claims, DC switching voltage regulator, containing a regulating transistor connected by one power electrode to an input terminal and a second power electrode through a switching diode - to an output terminal a choke connected by one output to a common bus, and the other output to a connection point a transistor and a switching diode, an output capacitor, a pulse-width modulator, the output of which is connected to the control electrode of the control transistor,: and one input from the output terminal Second, the source of reference voltage and shaper sawtooth voltage, characterized in that in order to provide the invariance of a voltage output relative to the input, power output shaper sawtooth voltage is connected via a first resistor to the input terminal and via a second resistor to the output terminal. Sources of information taken into account in the examination 1. The author's certificate of the USSR N ° 515101, cl. G 05 f 1/56, 1975. 2. USSR author's certificate number 541160, cl. G 05 F 1/56, 1976. 3. Golovatsky V. A. Transistor Switching Amplifiers and DC Voltage Stabilizers. M., Soviet Radio, 1974, p. 147.