SU1224798A1 - Pulse-width pegulator - Google Patents

Abstract

The invention allows to expand the range of adjustment and improve the quality of adjustment of the output parameter of the pulse-width controller. The regulator contains a regulating element 1 on a transistor switch 2, into which logic block 7 is inserted, with an output connected to a control input of key 2. The first and second inlets No. 1 of the logic block 7 are connected to the outputs of the RC multivibrator 6. Perg ov of block 7 connected to the first input of the element And 8, the second input of the converter through the inverter 9 is connected with the second input of the logic unit 7. The pulse-width controller can operate with a duty cycle within O y 1 and as a relay controller with large transient disturbances x 4 il. 7 .. (L to to 4 CO 00

Description

The invention relates to electrical engineering and can be used in devices for controlling electric drives and converters.

The purpose of the present invention is to expand the range of control and improve the quality of control of the output parameter.

FIG. 1 shows a structural scheme of a pulse-width regulator; in fig. 2 through 3, the state table and the technical implementation of the regulatory key element with the logic block in FIG. 4 - adjusting characteristic.

The pulse width regulator contains a regulating element 1 on a transistor switch 2, connected to the object to be controlled, a sensor 3 of an adjustable parameter, connected to the first input of the differential amplifier 4, the second input of which is connected to the source of the reference voltage 5, the outputs of the differential amplifier are connected respectively to the control input and the RC multi-vibrator 6, the outputs of the multivibrator 6 are connected to the first and second inputs, respectively, of the logic unit 7 of the control element 15, the first input logical a unit connected to the first input of the AND 8j second input through an inverter 9 is coupled to the second input of the logic block 7 in & the output element And 8 is connected to the control input of the transistor key 2.

In addition, the regulating element with a logic block is built on the output transistor 10, the base connected via resistor 1i to the emitter and directly to the emitter of the green control transistor 12, the collectors of transistors 10 and 12 are combined, the base of the first transistor 12 is connected to the collector of the second controller The transistor 13 fault and through the base resistor 14 is connected to the first input of the logic unit, the base of the second transistor 13 through the base resistor 15 is connected to the second input of the logic unit and through the emitter resistor 1 6 is connected to terash transistors 10 to 12.

The Shirotio-imgg / LN control works in the following way.

If you take a negative level of the logical signal for. I, and zero

|

16 ss

20 2S zo -

2247982

Howl level for O, as shown in FIG. 2, the first row of the table practically does not have a place in the diagram in FIG. 1, the second and third lines of line I reflect the normal mode when one of the transistors 1 or 18 is saturated, and another (18 suiJi 17) is respectively locked; the fourth line reflects the emergency mode when both transistors 17 and 18 are conducted. Thanks to this, logic block 7 In normal mode, at its output, Y duplicates the output B of the multivibrator. In emergency mode) where J is the positive pulse ratio, a long-term 1 appears at the output 1 instead of the set-O. However, the logic block 7 corrects this error of the multivibrator 6; and at the output it appears

at 0.

Therefore, the input-output characteristic (Fig. 4) has no failures and is relatively linear.,

In block 7, standard logic circuits can be used. However, it seems preferable to implement logic unit 7 in combination with transistor switch 2, as shown. 3. In this case, x, - x. Since the scheme on the fng. 3 executes the function of the logical block 7 and the function of the key 2 at the same time, the positive effect lies in the smaller number of elements, the absence; an additional power source of logic unit 7 and the necessity of controlling logical and power circuits. At the same time, there is an increase in functional reliability due to an increase in the gain factor of the key 10, which lacks a base resistor on the B2Sode, as well as its active locking and holding in locked coil by shunting the input of transistor 12 by switching the transistor 13.

The pulse width controller allows operation with a duty cycle of Ojj-iS 1 and as a relay region of mountains with large transient disturbances. The characteristic of the regulator is linear in almost the entire range of regulation. When it enters the dead-zone, when the self-oscillations of the m / e of the vibrator are broken, at the extreme points KaXs there is a jump in the duty cycle, for example, from J - 0.95 to 1 or from Y 0.0.5 to I O, i.e. in small

limits (cm / fig. 4). In the known regulators, this jump occurs from 0.95 to O or from 0.05 to 1, i.e. twenty times more, due to which there is a disturbance of the regulation process, as a result of which, for example, voltage supply or voltage is disturbed in power supply devices, a speed violation can occur in electric drive systems, and when regulating tenological processes take place waste products and waste materials.

In comparison with the known ones, the proposed controller has a wide range of regulation, noise immunity, relative frequency constant, integrating properties and simplicity of the circuit.

Claims (1)

Invention Formula The pulse width regulator, which contains the control element on a 25-speed switch, is connected to the output for connecting the input of the control cup, the sensor of the control block. Paired with the output of the object of the diffraction by the input of the simulated transponder output, what about, with the regulator regulating the regulating control key, corresponding to the vibrato containing which block, is non logical inverto epu9.Z 5 10 15 20 224798 (ICDO) 25 blocks. parameter connected to the output to connect the output of the control object, and the output connected to the first input of a transistor differential amplifier, the second input of which is connected to a voltage source, controlled by a symmetrical RC multivibrator at transistors, the control inputs of which are connected to the corresponding outputs Differential amplifier, characterized in that, in order to expand the range of regulation and increase the quality of regulation of the output parameter, to the regulating element a logical block, the output connected to the control input of the transistor switch, and the first and second input to the corresponding outputs of the RC multi-vibrator, the logic block containing an inverter and an element, the output of which is connected to the output of the logical block, the first input of the element i connected directly to the first input of the logic unit, and the second through an inverter with the second input of the logical 13.-SB  ; fm.Z  yft / j sriv.4 Compiled by V. Mosin Editor N. Slobod nickname Tehred N. Bonkalo Proofreader V. Sinidka Order 1952/48 Circulation 836 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5  yft / j Production and printing company, Uzhgorod, st. Project, 4