RU3845U1 - DC CONVERTER TO VARIABLE - Google Patents

Abstract

A DC / AC converter containing two power transistors, between the collectors of which the primary winding of the power transformer is turned on, the midpoint of which is connected to the positive terminal of the power source, and the negative terminal to the emitters of the power transistors and to the midpoints of the primary and secondary windings of the control transformer, the primary winding of the control transformer is connected between the collectors of two control transistors, and the secondary is between the bases of power transistors s, characterized in that it additionally introduced a control unit, configured as a series-connected voltage regulator and a push-pull oscillator, each of the two outputs of which is connected to the base of the respective control transistor whose emitters are connected to a positive power supply terminal.

Description

TRANSFER OF THE SEXY VOLTAGE TO VARIABLE

A useful model of isolation from devices for converting a constant voltage of a power source into an alternating voltage supplied to a load,

A DC-DC converter is known, which contains two trans88 @ tori and a transformer included in the circuit so that a positive feedback is created between the transistors, which prevents them from sequentially unlocking and locking Li J.

The disadvantages of this device are the loss of power loss @ ti, which are increased by the operation of the transformer @ by increasing the core voltage to amplify the frequency of the output voltage, the presence of a starting circuit, and the complexity of manufacturing the transformer @ additional windings

The closest to the model’s loops on technical grounds is the DC-to-AC converter, which will be taken as a prototype

The inverter ® switches the power transformer and two transistors, a voltage stabilizer to stabilize the frequency of the oscillator, which contains two control transistors and a transformer included in the circuit in such a way that positive feedback is created between the transistors, which ensures their alternate unlocking and locking "

The disadvantages of the device adopted as a prototype are power losses due to the operation of the control transformer with saturation of the core and the presence of a voltage stabilizer, as well as the dependence of the control frequency on the load current and the complex design of the control transformer with additional feedback windings.

mi Ш2М 7/515

The objective of the utility model is the creation of an npeoffpaaosel of direct voltage to variable simplified design and high efficiency due to the supply of a constant frequency of bipolar pulses through the primary winding of the control transformer without introducing its core into saturation mode, the task is achieved in that the DC-to-AC converter contains two power transistors, between the collectors of which the primary winding of the pitch transformer & transformer is included, average the point of which is connected by the d positive terminal of the power source, and the negative terminal by% emitters of power transistors and with the midpoints of the primary secondary by the windings of the control transformer, with the primary winding connected between the collectors of the two control transistors, and the secondary between the bases of the power transistors, an additional control loop is introduced, made in the form of a series-connected voltage regulator and a push-pull master oscillator, each of which has two outputs connected to a bay of the corresponding control transistor whose emitters are connected by the s positive terminal of the power source.

A new distinguishing feature of the claimed utility model from the prototype is the introduction of a control lock made in the form of a successively connected voltage regulator and a push-pull master oscillator, each of the two outputs of which is connected to the base of the corresponding control transistor, the emitters of which are connected to the positive terminal of the power source, which together allowed retaining all the properties of the prototype device to obtain new qualities:

- ensure a stable frequency of the output voltage, regardless of fluctuations in the voltage of the supply network, the parameters of the circuit and load,

-to simplify the design of the control transformer due to the exclusion of feedback windings.

Therefore, we can conclude that, according to the totality of features, the proposed technical solution meets the criteria of the inventor (5th level.

The essence of the field model is illustrated by the drawing, in which the converter circuit is shown.

Utility model © will contain two power transistors I and 2, the primary winding 3 of the power transformer 4, the middle point of which is connected to the positive terminal of the power source 5, the primary used and the secondary 7 windings of the control transformer 8, two control transistors 9 and 10. In addition, the model contains the control lock And, made in the form of a voltage stabilizer I i and two clock master oscillator 13 "

The voltage stabilizer 12 can be made on a vase of the microcircuit, and a push-pull master oscillator 13 based on the K155 LAZ microcircuit and the K15b TM2 trigger.

The utility model works as follows. From the control lock AND, for 1 $ azm of transistors i- and 10, rectangular pulses are received, © moved one relative to the other half the control period. By alternately unlocking, transistors 9 and 10 connect the primary control transformer 8 to the power source 5 and rectangular voltage pulses are formed on the secondary winding 7 of the control transformer 8, supplied to the power transistors I n 2, Negative half-wave impulses transistors I m 2 are alternately locked, and positive half-wave they open and connect the primary

M j

winding 3 of the ligand and transformer 4 to the power source 5 In this case, the output alternating voltage of the converter is formed on the secondary winding of the transformer 4.

The constant frequency of the output voltage of the converter, regardless of fluctuations in the voltage of the power supply 5, the parameters of the circuit and load, is provided by the power of the push-pull master oscillator 13 through the voltage regulator 12 of the control unit II

Introduction block And GO stable frequency control ysafesatUHU. allows to simplify the design of the control transformer of 8 hectares and excludes feedback windings, reduce power losses by eliminating the operation of the tram of the control formatter 8 and core saturation and voltage regulator at the input of the converter and, thereby, increase the efficiency of the utility model.

Sources of information taken into account. I Calculation of transistors. Per, from English. , M ,,

Energy,, fig. 34-3.

2, Calculation of transistor circuits. Per. from English., M., Energy, 165 & G., fig. 35-5.

(/

Claims (1)

A DC / AC converter containing two power transistors, between the collectors of which the primary winding of the power transformer is turned on, the midpoint of which is connected to the positive terminal of the power source, and the negative terminal to the emitters of the power transistors and to the midpoints of the primary and secondary windings of the control transformer, the primary winding of the control transformer is connected between the collectors of two control transistors, and the secondary is between the bases of power transistors s, characterized in that it additionally introduced a control unit, configured as a series-connected voltage regulator and a push-pull oscillator, each of the two outputs of which is connected to the base of the respective control transistor whose emitters are connected to a positive power supply terminal.